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 and a pole, the cover plate body comprises a protruding part and a connecting part which are connected, the protruding part comprises a first part, a second part and a third part, the first part and the third part extend in the first direction, the second part extends in the second direction, and the first part, the second part and the third part are sequentially connected end to end, so that the connecting part is in a Z shape; the pole columns comprise at least two first pole columns and at least one second pole column, the first pole columns penetrate through the first part, the at least two first pole columns are arranged at intervals in the first direction, and the second pole columns penetrate through the second part. According to the cover plate assembly, the flexural rigidity and the deformation resistance of the connecting part can be greatly improved by utilizing a folding angle enhancement effect, and the deformation resistance of the cover plate body is improved; the current distribution of the battery can be optimized, the charging and discharging efficiency and the power upper limit of the battery are improved, the local high temperature is reduced, and the temperature stability is guaranteed.

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] With the rapid development of new energy vehicles, electronic products, and energy storage industries, lithium-ion batteries, as the core energy carrier, have seen their energy density, safety, and structural reliability become key factors in technological competition. In battery structure design, the cover plate, as the core component for encapsulating the electrode assembly, undertakes multiple functions, including sealing the electrolyte, fixing the electrode posts, transmitting pressure, and ensuring thermal runaway safety.

[0003] Currently, the industry generally uses flat metal covers (such as aluminum alloy or nickel-plated steel), which are characterized by flat thin plates of equal thickness. Although this structure has the advantages of convenient processing and low cost, it has the problem of insufficient resistance to deformation in practical applications. Due to its thin thickness and large plane span, the flat cover is prone to warping, deformation or even cracking when subjected to the expansion force of the electrode group or external impact load during battery charging and discharging cycles.

[0004] In addition, under normal circumstances, only one terminal is set at the positive or negative terminal of the battery to connect the internal electrode of the battery to the external circuit. The design of a single terminal means that the current can only be conducted through this one terminal, resulting in a high concentration of current density in the terminal and its surrounding area, which can easily cause local heating. Especially under high current charging and discharging conditions (such as the acceleration and fast charging scenarios of new energy vehicles), local heating is severe and temperature control is difficult.

[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 greatly improves the deformation resistance of the cover plate body; optimizes the current distribution of the battery, reduces local heat generation, enhances the high-current charging and discharging capability of the battery, and thus improves the battery performance.

[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 protrusion and a connecting portion connected together. The protrusion includes a first part, a second part and a third part. The first part and the third part both extend along a first direction, and the second part extends along a second direction. The first part, the second part and the third part are connected end to end in sequence so that the connecting portion is Z-shaped. The first direction is perpendicular to the second direction.

[0010] The electrode post includes at least two first electrode posts and at least one second electrode post, wherein the first electrode post is disposed in the first part, the at least two first electrode posts are arranged at intervals along the first direction, and the second electrode post is disposed in the second part.

[0011] As an optional solution, the cover plate assembly further includes:

[0012] A riveting component is disposed on the outside of the cover plate body. The riveting component includes a fourth part and a fifth part connected to each other so that the riveting component is L-shaped. The fourth part is connected to the first pole post, and the fifth part is connected to the second pole post.

[0013] As an optional solution, the protrusion protrudes from the first pole post and / or the fourth part along the second direction;

[0014] And / or, the third part protrudes from the second pole post and / or the fifth part along the first direction.

[0015] As an optional solution, the dimension of the third part in the first direction is W1, and the dimension of the second part in the first direction is W2, where 5.5mm≤W1-W2≤12mm.

[0016] As an optional solution, the protrusion includes a substrate and a plurality of side plates erected on the substrate, the plurality of side plates and the substrate together forming a first accommodating space, and at least a portion of the electrode assembly is disposed within the first accommodating space.

[0017] As an optional solution, the distance between the outer side of the substrate and the outer side of the first part in the second direction is H1, and the maximum dimension of the side plate in the second direction is H2, where 2mm≤H2-H1≤40mm;

[0018] And / or, the dimension of the substrate in the first direction is L1, and the dimension of the cover plate body in the first direction is L2, 0.38≤L1 / L2≤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 at at least one end, and the cover assembly covers the opening.

[0020] As an optional solution, the electrode group is provided with electrode tabs, and the cover plate assembly further includes:

[0021] A connector is connected to a pole post, and the tab is connected to the pole post and / or the connector.

[0022] As an optional solution, the connecting part is provided with a second receiving space, the connecting member is disposed in the second receiving space, and at least a portion of the electrode tab is located in the second receiving space.

[0023] An electrical device includes a main body and the aforementioned battery.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] The cover plate assembly provided by the present invention, by setting the cover plate body as a connected protrusion and a connecting part, and setting the connecting part as Z-shaped, can significantly improve the bending stiffness and deformation resistance of the connecting part by utilizing the "angle enhancement effect", thereby improving the deformation resistance of the cover plate body; by setting the electrode post as at least two first electrode posts and at least one second electrode post, the current distribution of the battery can be optimized, the charging and discharging efficiency and power limit of the battery can be improved, local high temperature can be reduced, and temperature stability can be ensured.

[0026] The battery provided by the present invention, by applying the above-mentioned cover plate assembly, has better resistance to deformation, while avoiding local high temperature in and around the terminals, thereby improving the charging and discharging efficiency and power limit of the battery.

[0027] The electrical device provided by the present invention, by using the above-mentioned battery, has good resistance to deformation and high current charging and discharging capability. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the battery structure provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a partial cross-sectional view of the battery provided in Embodiment 1 of the present invention;

[0031] Figure 3 This is a first view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is an exploded view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0033] Figure 5 This is a second view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0034] Figure 6 This is a third view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0035] Figure 7 for Figure 6 Sectional view at point AA;

[0036] Figure 8 This is a structural schematic diagram of the vehicle provided in Embodiment 2 of the present invention.

[0037] Figure label:

[0038] 10000, vehicles;

[0039] 1000, battery;

[0040] 100. Cover plate assembly;

[0041] 10. Cover plate body; 11. Protrusion; 1101. First accommodating space; 111. Base plate; 1111. First explosion-proof hole; 112. Side plate; 12. Connecting part; 1201. Second accommodating space; 121. First part; 122. Second part; 123. Third part;

[0042] 21. First pole; 22. Second pole;

[0043] 30. Riveted parts; 31. Part Four; 32. Part Five;

[0044] 40. First insulating component;

[0045] 50. Second insulating component;

[0046] 60. Sealing components;

[0047] 70. Connectors;

[0048] 200. Housing; 210. First side surface; 2101. Second explosion-proof hole; 220. Second side surface;

[0049] 300, Electrode Group; 310, Electrode Sheet;

[0050] 2000, controller; 3000, motor. Detailed Implementation

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] Example 1

[0058] like Figures 1-2 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] Optionally, the cover plate assembly 100 includes a terminal post and a riveting member 30. The terminal post includes a post body and a plate body. The post body passes through the cover plate body 10 and is riveted to the riveting member 30 after passing through one side of the cover plate body 10. The cover plate body 10 is sandwiched in the middle by the plate body and the riveting member 30, so that the terminal post and the riveting member 30 are respectively assembled with the cover plate body 10. The plate body of the terminal post is connected to the electrode group 300. The terminal post can connect the electrode group 300 to the external circuit, so that the battery 1000 can be charged and discharged.

[0063] In related technologies, flat metal covers are commonly used, but they suffer from insufficient resistance to deformation in practical applications. Furthermore, typically, a single terminal is used for either the positive or negative electrode of a battery to connect the internal electrodes to the external circuitry. This single-terminal design means that current can only be conducted through this one terminal, resulting in a high concentration of current density in and around the terminal, which easily leads to localized heating.

[0064] To solve the above problems, such as Figures 1-5 As shown, the cover plate body 10 provided in this embodiment includes a protrusion 11 and a connecting portion 12 connected to each other. The protrusion 11 includes a first portion 121, a second portion 122 and a third portion 123. The first portion 121 and the third portion 123 both extend along a first direction, and the second portion 122 extends along a second direction. The first portion 121, the second portion 122 and the third portion 123 are connected end to end in sequence so that the connecting portion 12 is Z-shaped. The pole includes at least two first poles 21 and at least one second pole 22. The first pole 21 passes through the first portion 121, and the at least two first poles 21 are arranged at intervals along the first direction. The second pole 22 passes through the second portion 122.

[0065] By setting the cover plate body 10 as a connected protrusion 11 and a connecting part 12, and setting the connecting part 12 as Z-shaped, the bending stiffness and deformation resistance of the connecting part 12 can be greatly improved by utilizing the "angle enhancement effect", thereby improving the deformation resistance of the cover plate body 10. By setting the electrode post as at least two first electrode posts 21 and at least one second electrode post 22, the current distribution of the battery 1000 can be optimized, the charging and discharging efficiency and power limit of the battery 1000 can be improved, local high temperature can be reduced, and temperature stability can be ensured.

[0066] Optionally, the cover plate body 10 is formed by stamping, which has advantages such as high production efficiency and high material utilization.

[0067] Optionally, the protrusion 11 includes a substrate 111 and a plurality of side plates 112 erected on the substrate 111. The plurality of side plates 112 and the substrate 111 together form a first accommodating space 1101. At least a portion of the electrode assembly 300 is disposed in the first accommodating space 1101, which can increase the volume of the electrode assembly 300, thereby increasing the capacity of the battery 1000. It can also support and protect the electrode assembly 300, preventing the electrode assembly 300 from moving or shifting.

[0068] Optionally, the riveting member 30 is disposed on the outer side of the cover plate body 10. The riveting member 30 includes a fourth part 31 and a fifth part 32 connected to each other, so that the riveting member 30 is L-shaped. The fourth part 31 is connected to the first pole post 21, and the fifth part 32 is connected to the second pole post 22. That is, the connection between the first pole post 21 and the second pole post 22 through an L-shaped riveting member 30 improves the integration, reduces the number of connection points, and reduces the risk of loose connections. The outer side of the cover plate body 10 is the side of the cover plate body 10 that is away from the pole group 300.

[0069] Optionally, the protrusion 11 protrudes from the first pole post 21 and / or the fourth part 31 along the second direction, so that the protrusion 11 can effectively protect the first pole post 21 and the fourth part 31 and prevent the first pole post 21 and the fourth part 31 from being bumped or damaged.

[0070] Optionally, the distance between the outer surface of the substrate 111 and the outer surface of the fourth part 31 in the second direction is greater than the thickness of the connecting piece. This provides space for the connecting piece during the assembly of the battery 1000, 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 terminal posts and / or riveting members 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.

[0071] Optionally, the third part 123 protrudes from the second pole post 22 and / or the fifth part 32 along the first direction, so that the third part 123 can effectively protect the second pole post 22 and the fifth part 32, and prevent the second pole post 22 and the fifth part 32 from being bumped or damaged.

[0072] Optionally, the distance between the outer side of the third part 123 along the first direction and the outer side of the fifth part 32 in the first direction is greater than the thickness of the connecting piece, so as to provide installation space for the connecting piece connected to the fifth part 32 and / or the second pole post 22, thereby further saving the assembly space of the module and further improving the module assembly rate.

[0073] like Figure 6 and Figure 7As shown, the substrate 111 has a dimension of L1 in the first direction, and the cover plate body 10 has a dimension of L2 in the first direction. 0.38 ≤ L1 / L2 ≤ 0.6, to ensure a good capacity increase for the battery 1000 and the current carrying capacity of the cover plate assembly 100. When the value of L1 / L2 is too small, the length ratio of the protrusion 11 is insufficient, affecting the increase in the size of the electrode group 300 at the protrusion 11 and reducing the capacity increase of the battery 1000. When the value of L1 / L2 is too large, on the one hand, it leads to insufficient space for the riveting component 30, affecting the current carrying capacity of the cover plate assembly 100 and making it unable to meet the high-rate fast charging requirements; on the other hand, it leads to a weak fixing effect of the riveting component 30. For example, the value of L1 / L2 can be 0.38, 0.4, 0.45, 0.5, 0.55, or 0.6. In other embodiments, the value of L1 / L2 can also be any other value between 0.38 and 0.6.

[0074] like Figure 7 As shown, the distance between the outer surface of the substrate 111 and the outer surface of the first part 121 in the second direction is H1, and the maximum dimension of the side plate 112 in the second direction is H2, where 2mm ≤ H2 - H1 ≤ 40mm, to ensure a good connection effect of the cover and a good forming effect of the protrusion 11. When the value of H2 - H1 is too small, the structural strength of the cover body 10 decreases, and the mating surface of the cover cannot achieve a planar fit, requiring a stepped structure, which increases the difficulty of the cover fit. When the value of H2 - H1 is too large, the forming difficulty of the protrusion 11 increases, and the weight and cost of the cover body 10 also increase. The value of H2 - H1 can be 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, 36mm, 38mm, or 40mm. In other embodiments, the values ​​of H2-H1 can also be any other value between 2 mm and 40 mm.

[0075] Optionally, the third part 123 has a dimension of W1 in the first direction, and the second part 122 has a dimension of W2 in the first direction, with 5.5mm ≤ W1 - W2 ≤ 12mm. This provides sufficient installation space for the fifth part 32 of the riveting component 30 and the connecting piece, while ensuring a good capacity increase effect for the battery 1000. When the value of W1 - W2 is too small, the installation space for the fifth part 32 of the riveting component 30 and the connecting piece is insufficient, and the third part 123 cannot effectively protect the connecting piece, the fifth part 32, and the second terminal 22, reducing the safety performance of the battery 1000. When the value of W1 - W2 is too large, the distance between the fifth part 32 and the edge is too large. This affects the size increase of the electrode group 300, reduces the rate of capacity increase of the battery 1000, and reduces the performance of the battery 1000 and the overall space utilization rate of the pack. For example, the values ​​of W1-W2 can be 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, or 12mm. In other embodiments, the values ​​of W1-W2 can also be any other value between 5.5mm and 12mm.

[0076] Optionally, the dimension W2 of the second part 122 in the first direction satisfies: 6mm ≤ W ≤ 20mm, to ensure the stamping quality of the cover plate body 10. For example, the value of W2 can be 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, or 20mm. In other embodiments, the value of W2 can also be any other value between 6mm and 20mm.

[0077] Optionally, the cover plate body 10 has a dimension of W3 in a third direction, meaning the thickness of the battery 1000 is W3, where 20mm ≤ W3 ≤ 120mm. This avoids the disadvantages of an excessively thin battery 1000, such as insufficient structural strength, limited capacity, and performance; and avoids the disadvantages of an excessively thick battery 1000, such as low heat dissipation efficiency and susceptibility to thermal runaway. For example, the value of W3 can be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, or 120mm. In other embodiments, the value of W3 can also be any other value between 20mm and 120mm.

[0078] like Figure 7As shown, the wall thickness of the substrate 111 is T1, where 2mm ≤ T1 ≤ 3mm, to ensure that the protrusion 11 has sufficient strength. Exemplarily, the value of T1 can be 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm. In other embodiments, the value of T1 can also be any other value between 2mm and 3mm.

[0079] like Figure 7 As shown, the wall thickness of the riveting component 30 is T2, where 1.6mm ≤ T2 ≤ 3mm, to ensure that the riveting component 30 has sufficient strength and meets the requirements for flow capacity. Exemplarily, the value of T2 can be 1.6mm, 1.7mm, 18mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, or 3mm. In other embodiments, the value of T2 can also be any other value between 1.6mm and 3mm.

[0080] Optionally, the cover assembly 100 further includes a connector 70, and the electrode group 300 is provided with a tab 310. The connector 70 is connected to the terminal post, and the tab 310 is connected to the terminal post and / or the connector 70. By setting the tab 310 to be connected to the terminal post and / or the connector 70, the area of ​​the tab 310 can be maximized, thereby increasing the current-carrying area of ​​the tab 310 and the welding area of ​​the tab 310, thus improving the current-carrying capacity to meet the needs of high-capacity fast charging.

[0081] In this embodiment, the connector 70 and the tab 310 are both L-shaped, and the first terminal 21, the second terminal 22, 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 to an L-shape individually.

[0082] like Figure 7 As shown, the wall thickness of connector 70 is T3, where 1.5mm ≤ T3 ≤ 2.5mm, to ensure that connector 70 has sufficient strength and sufficient flow capacity. Exemplarily, the value of T3 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, or 2.5mm. In other embodiments, the value of T3 can also be any other value between 1.5mm and 2.5mm.

[0083] Optionally, the connecting portion 12 is provided with a second accommodating space 1201, the connector 70 is disposed within the second accommodating space 1201, and at least a portion of the electrode tab 310 is located within the second accommodating space 1201. With this arrangement, the connector 70 and the electrode tab 310 can be prevented from occupying the internal space of the housing 200, thereby further increasing the volume of the electrode assembly 300 within the housing 200, and further improving the capacity of the battery 1000.

[0084] Table 1

[0085]

[0086]

[0087] Table 1 shows the relationship between the wall thickness T1 of the substrate 111, the wall thickness T2 of the riveting member 30, the wall thickness T3 of the connector 70, H2-H1, the dimensions W2, W1-W2, and L1 / L2 of the second part 122 in the first direction, and the dimension W3 of the cover body 10 in the third direction. Examples 1-6 show the values ​​of T1, T2, T3, H2-H1, W2, W1-W2, L1 / L2, and W3 when the battery 1000 has a yield rate >98%; Comparative Examples 1-6 show the values ​​of H2-H1, W1-W2, and L1 / L2 when the battery 1000 has a yield rate <98%.

[0088] 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.

[0089] In Examples 1-6, the values ​​of T1, T2, T3, H2-H1, W2, W1-W2, L1 / L2, and W3 are all within the defined range. The yield rate of battery 1000 is >98%, and no abnormalities such as mismatch or strength issues were found between the cover plate body 10 and the casing 200. 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.

[0090] In Comparative Example 1, the value of H2-H1 is too small, the structural strength of the cover body 10 is reduced, the mating surface of the shell and cover cannot achieve a planar fit, a stepped structure needs to be made, and the fit of the shell and cover is more difficult.

[0091] In Comparative Example 2, the value of H2-H1 is too large, which increases the difficulty of forming the protrusion 11 and also increases the weight and cost of the cover plate body 10.

[0092] In Comparative Example 3, the W1-W2 values ​​are too small, resulting in insufficient installation space for the fifth part 32 of the rivet 30 and the connecting piece. The third part 123 cannot effectively protect the connecting piece, the fifth part 32, and the second pole piece 22, thus reducing the safety performance of the battery 1000.

[0093] In Comparative Example 4, the values ​​of W1-W2 are too large, and the distance from the edge of the fifth part 32 is too large, which affects the size improvement of the electrode group 300, reduces the capacity improvement of the battery 1000, and reduces the performance of the battery 1000 and the overall space utilization rate of the pack.

[0094] In Comparative Example 5, the value of L1 / L2 is too small, the proportion of the protrusion 11 is insufficient, which reduces the improvement of the size of the electrode group 300 at the protrusion 11 and affects the improvement of the battery capacity 1000.

[0095] In Comparative Example 6, the value of L1 / L2 is too large, and the proportion of the protrusion 11 is too large. On the one hand, this results in insufficient space for the placement of the rivet 30, affecting the current carrying capacity of the cover assembly 100 and making it unable to meet the high-rate fast charging requirements. On the other hand, it results in a weak fixing effect of the rivet 30.

[0096] Optionally, the cover plate assembly 100 also includes a seal 60, which is sandwiched between the electrode post and the cover plate body 10. The seal 60 can insulate and isolate the electrode post and the cover plate body 10 to prevent short circuit between the electrode post and the cover plate body 10. At the same time, the seal 60 can seal the gap between the electrode post and the cover plate body 10 to prevent leakage of electrolyte or gas.

[0097] Optionally, the cover plate assembly 100 further includes a first insulating member 40, which is disposed between the riveting member 30 and the cover plate body 10 to ensure insulation between the riveting member 30 and the cover plate body 10 and to prevent short circuit between the riveting member 30 and the cover plate body 10.

[0098] 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.

[0099] In this embodiment, at least a portion of the second insulating member 50 is located between the connecting portion 12 and the connector 70 of the cover plate body 10 to avoid short circuit between the connecting portion 12 and the connector 70, thereby improving the safety performance of the battery 1000.

[0100] like Figure 1As shown, the housing 200 includes a first side 210 and a second side 220, which are alternately connected to form a shell-like structure with openings at both ends to accommodate the electrode assembly 300. The battery 1000 includes two cover assemblies 100, which cover corresponding openings. One cover assembly 100 has a positive terminal, and the other cover assembly 100 has a negative terminal. It is understood that the shape of the opening of the housing 200 is adapted to the shape of the cover body 10.

[0101] Optionally, a first explosion-proof hole 1111 is provided on the substrate 111. Optionally, a second explosion-proof hole 2101 is provided on the first side surface 210. Explosion-proof valves are welded to the inner walls of the first explosion-proof hole 1111 and the second explosion-proof hole 2101, respectively. When an abnormality occurs inside the battery 1000, and 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 first explosion-proof hole 1111 and the second explosion-proof hole 2101, releasing the internal pressure of the casing 200, preventing the battery 1000 from thermal runaway and exploding / catching fire, and improving the safety of the battery 1000.

[0102] Optionally, the second explosion-proof hole 2101 is located in the middle of the first side 210 to shorten the exhaust path.

[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 8As 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 protrusion (11) and a connecting part (12) connected together. The protrusion (11) includes a first part (121), a second part (122) and a third part (123). The first part (121) and the third part (123) both extend along a first direction, and the second part (122) extends along a second direction. The first part (121), the second part (122) and the third part (123) are connected end to end in sequence so that the connecting part (12) is Z-shaped. The first direction is perpendicular to the second direction. The pole includes at least two first poles (21) and at least one second pole (22), the first poles (21) are inserted through the first part (121), the at least two first poles (21) are arranged at intervals along the first direction, and the second poles (22) are inserted through the second part (122).

2. The cover plate assembly according to claim 1, characterized in that, The cover plate assembly also includes: A riveting component (30) is disposed on the outside of the cover plate body (10). The riveting component (30) includes a fourth part (31) and a fifth part (32) connected to each other so that the riveting component (30) is L-shaped. The fourth part (31) is connected to the first pole post (21), and the fifth part (32) is connected to the second pole post (22).

3. The cover plate assembly according to claim 2, characterized in that, The protrusion (11) protrudes out of the first pole post (21) and / or the fourth part (31) along the second direction; And / or, the third part (123) protrudes from the second pole post (22) and / or the fifth part (32) along the first direction.

4. The cover plate assembly according to claim 1, characterized in that, The third part (123) has a dimension of W1 in the first direction, and the second part (122) has a dimension of W2 in the first direction, with 5.5mm ≤ W1 - W2 ≤ 12mm.

5. The cover plate assembly according to claim 1, characterized in that, The protrusion (11) includes a substrate (111) and a plurality of side plates (112) erected on the substrate (111). The plurality of side plates (112) and the substrate (111) together form a first accommodating space (1101). At least a portion of the pole assembly (300) is disposed within the first accommodating space (1101).

6. The cover plate assembly according to claim 5, characterized in that, The distance between the outer side of the substrate (111) and the outer side of the first part (121) in the second direction is H1, and the maximum dimension of the side plate (112) in the second direction is H2, 2mm≤H2-H1≤40mm; And / or, the substrate (111) has a dimension of L1 in the first direction, and the cover plate body (10) has a dimension of L2 in the first direction, 0.38≤L1 / L2≤0.

6.

7. 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 1-6, wherein the pole group (300) is disposed within the housing (200), the housing (200) has an opening at at least one end, and the cover plate assembly covers the opening.

8. The battery according to claim 7, characterized in that, The electrode assembly (300) is provided with electrode tabs (310), and the cover plate assembly further includes: A connector (70) is connected to a pole post, and a tab (310) is connected to the pole post and / or the connector (70).

9. The battery according to claim 8, characterized in that, The connecting part (12) is provided with a second accommodating space (1201), the connecting member (70) is disposed in the second accommodating space (1201), and at least a portion of the tab (310) is located in the second accommodating space (1201).

10. An electrical appliance, comprising an electrical appliance body, characterized in that, It also includes the battery as described in any one of claims 7-9.

Images