Battery and electric device

Abstract

The invention relates to the technical field of batteries, in particular to a battery and an electric device. The battery comprises a cover plate assembly and a pole group, the cover plate assembly comprises a cover plate body, the cover plate body comprises a support and a top protection plate, the support comprises a first protruding part and connecting parts arranged on the two sides of the first protruding part in the first direction, the first protruding part is provided with a first containing space, and the first containing space is provided with a notch; the top protection plate comprises a flat plate part and a second protruding part formed by sinking the flat plate part, the flat plate part covers the notch, the second protruding part is provided with a second containing space, the pole group comprises a third protruding part and a fourth protruding part which are connected, at least part of the third protruding part is arranged in the first containing space, and the fourth protruding part is arranged in the second containing space. The battery can adapt to a special-shaped installation environment, the space utilization rate is improved, the capacity of the battery is improved, and the performance of the battery is further improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to 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 commonly 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 offers advantages such as easy processing and low cost, it has significant drawbacks in practical applications:

[0004] Poor spatial adaptability has led to the development of irregular shapes (such as curved corners and stepped stacking) in electrode design to improve energy density. Traditional flat cover plates cannot conform to the irregular shape of the electrode assembly, wasting the internal volume of the casing and further restricting the volume utilization rate of the electrode assembly, becoming a key bottleneck for increasing battery capacity.

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

[0006] The purpose of this invention is to provide a battery and power device that can adapt to irregular installation environments, improve space utilization, increase battery capacity, and thus improve battery performance.

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

[0008] A battery comprising:

[0009] A cover plate assembly includes a cover plate body, the cover plate body including a bracket and a top cover plate, the bracket including a first protrusion and connecting portions disposed on both sides of the first protrusion along a first direction, the first protrusion having a first accommodating space having a notch, the top cover plate including a flat plate and a second protrusion formed by a recess in the flat plate, the flat plate covering the notch, and the second protrusion having a second accommodating space.

[0010] The electrode assembly includes a third protrusion and a fourth protrusion connected to each other, wherein at least a portion of the third protrusion is disposed within the first accommodating space, and the fourth protrusion is disposed within the second accommodating space.

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

[0012] The electrode includes a first electrode and a second electrode, wherein the first electrode passes through the flat plate portion and the second electrode passes through the connecting portion.

[0013] As an optional solution, the cover plate assembly further includes a riveting member, which includes a first part, a second part, and a third part. The first part is connected to the first pole post, the second part is connected to the second pole post on the same side as the first pole post, and the first part is connected to the second part through the third part.

[0014] As an optional solution, the second protrusion protrudes beyond the first pole post and / or the first part;

[0015] And / or, the top guard plate further includes a protective portion connected to the flat plate portion, the protective portion protruding from the first pole post and / or the first portion.

[0016] As an optional feature, the top guard plate may further include a reinforcing structure connected to the flat plate portion and / or the protective portion.

[0017] As an optional solution, the protective part protrudes from the first part by a dimension of H1 along the second direction, and the dimensions of the second protrusion and the first part in the second direction are H2, where 2mm≤H2-H1≤20mm, and the first direction is perpendicular to the second direction.

[0018] As an optional solution, the second protrusion has a dimension of L1 in the first direction, and the distance between the two third parts in the first direction is L2, where 40mm≤L2-L1≤120mm;

[0019] And / or, the dimension of the bracket in the first direction is L3, 0.5≤L2 / L3≤0.75.

[0020] As an optional solution, the electrode assembly is provided with an electrode tab, which is connected to the third protrusion. The cover plate assembly also includes a connector, and the electrode post is connected to the electrode tab through the connector.

[0021] As an optional solution, the battery further includes a housing, the housing including a first side plate, the first side plate including a first main body portion and a fifth protrusion portion connected to each other, the first protrusion portion having a groove, and the fifth protrusion portion being inserted into the groove.

[0022] An electrical device includes a main body and the aforementioned battery.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] The battery provided by the present invention provides a first accommodating space in the first protrusion, at least a portion of the third protrusion of the electrode assembly is disposed in the first accommodating space, a second accommodating space is disposed in the second protrusion, and a fourth protrusion of the electrode assembly is disposed in the second accommodating space, so that the cover body can adapt to the irregular contour of the electrode assembly, adapt to irregular installation environment, increase the volume of the electrode assembly, and thus improve the battery capacity. It can also support and protect the electrode assembly through the first and second protrusions, preventing the electrode assembly from moving or shifting. By setting the cover body as a separate bracket and top guard plate, it is easy to form the cover body.

[0025] The electrical device provided by the present invention, by using the aforementioned battery, has a higher capacity, improves space utilization, and thus enhances the device's battery life. 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 third structure of the cover plate assembly provided in Embodiment 1 of the present invention;

[0033] Figure 7 This is a schematic diagram of the fourth 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 schematic diagram of the pole group provided in Embodiment 1 of the present invention;

[0036] Figure 10 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. Bracket; 1101. Third accommodating space; 111. First protrusion; 1111. First accommodating space; 11111. Notch; 1112. Groove; 112. Connecting part; 12. Top guard plate; 121. Flat plate; 122. Second protrusion; 1221. Second accommodating space; 123. Protective part; 124. Reinforcing structure;

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

[0043] 30. Riveted parts; 31. Part 1; 32. Part 2; 33. Part 3;

[0044] 40. First insulating component;

[0045] 50. Second insulating component;

[0046] 60. Sealing components;

[0047] 70. Connectors;

[0048] 200. Shell; 210. Second side plate; 2101. Explosion-proof hole; 220. First side plate; 221. First main body; 222. Fifth protrusion;

[0049] 300, pole assembly; 310, second main body; 320, third protrusion; 330, fourth protrusion; 340, pole tab;

[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] Currently, the industry generally uses flat metal covers, but in practical applications, there is a problem of poor space adaptability, which affects the increase of battery capacity.

[0063] To solve the above problems, such as Figures 2-5As shown, the cover plate body 10 includes a bracket 11 and a top cover plate 12. The bracket 11 includes a first protrusion 111 and connecting portions 112 disposed on both sides of the first protrusion 111 along a first direction. The first protrusion 111 has a first accommodating space 1111 and a notch 11111. The top cover plate 12 includes a flat plate 121 and a second protrusion 122 formed by the recess of the flat plate 121. The flat plate 121 covers the notch 11111. The second protrusion 122 has a second accommodating space 1221. The pole assembly 300 includes a third protrusion 320 and a fourth protrusion 330 connected to each other. At least a portion of the third protrusion 320 is disposed in the first accommodating space 1111, and the fourth protrusion 330 is disposed in the second accommodating space 1221.

[0064] By providing a first accommodating space 1111 in the first protrusion 111, at least a portion of the third protrusion 320 of the electrode assembly 300 is disposed within the first accommodating space 1111, a second accommodating space 1221 is provided in the second protrusion 122, and a fourth protrusion 330 of the electrode assembly 300 is disposed within the second accommodating space 1221, so that the cover body 10 can adapt to the irregular contour of the electrode assembly 300, adapt to irregular installation environments, increase the volume of the electrode assembly 300, thereby increasing the capacity of the battery 1000, and can also support and protect the electrode assembly 300 through the first protrusion 111 and the second protrusion 122, preventing the electrode assembly 300 from shifting or moving; by setting the cover body 10 as a separate bracket 11 and top protective plate 12, it is convenient to form the cover body 10.

[0065] To ensure a stable connection between the bracket 11 and the top cover plate 12, the bracket 11 and the top cover plate 12 are welded together.

[0066] Optionally, the center of the projection of the second protrusion 122 onto the flat plate 121 coincides with the center of the flat plate 121. That is, the second protrusion 122 is formed by a recess in the middle of the flat plate 121, so that the top guard plate 12 can be subjected to uniform force and avoid local stress concentration.

[0067] Optionally, the cover plate assembly 100 also includes a terminal post, which includes a post body and a plate body. The post body passes through the cover plate body 10 and extends out of the cover plate body 10 from one side. The terminal post can connect the electrode group 300 to the external circuit, which facilitates the charging and discharging of the battery 1000.

[0068] In this embodiment, the terminals include a first terminal 21 and a second terminal 22. The first terminal 21 passes through the flat plate portion 121, and the second terminal 22 passes through the connecting portion 112. This arrangement optimizes the current path, reduces internal resistance and localized heat generation, and enhances the battery's high-rate charge / discharge capability (1000), thus meeting high-power requirements.

[0069] A sealing element 60 is provided between the first electrode post 21 and the second electrode post 22 and the cover plate body 10. The sealing element 60 can insulate and isolate the first electrode post 21 and the second electrode post 22 from the cover plate body 10, preventing short circuit between the first electrode post 21 or the second electrode post 22 and the cover plate body 10. At the same time, the sealing element 60 can seal the gap between the first electrode post 21 and the second electrode post 22 and the cover plate body 10, preventing leakage of electrolyte or gas.

[0070] Optionally, the cover plate assembly 100 further includes a riveting member 30, which includes a first part 31, a second part 32, and a third part 33. The first part 31 is connected to the first pole post 21, the second part 32 is connected to the second pole post 22 on the same side as the first pole post 21, and the first part 31 is connected to the second part 32 through the third part 33. That is, the riveting member 30 is Z-shaped, and the first pole post 21 and the second pole post 22 on the same side are connected to the same riveting member 30, which improves integration, reduces connection points, and reduces the risk of loose connections.

[0071] 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.

[0072] Optionally, the first protrusion 111 protrudes from the second pole post 22 and / or the second part 32 to avoid damage such as bumps to the second pole post 22 and the second part 32 during the manufacturing process or use.

[0073] Optionally, the second protrusion 122 protrudes from the first pole post 21 and / or the first part 31. Optionally, the top guard plate 12 also includes a protective part 123, which is connected to the flat plate part 121 and protrudes from the first pole post 21 and / or the first part 31. The second protrusion 122 and the protective part 123 provide protection for the first pole post 21 and the first part 31, preventing damage such as bumps from occurring during manufacturing or use.

[0074] Optionally, the second protrusion 122 is provided with two protective parts 123 on both sides along the first direction, and the two protective parts 123 are arranged at intervals along the third direction. The first part 31 is disposed between the two protective parts 123 to further improve the protective effect of the protective parts 123 on the first part 31 and avoid damage such as bumps to the riveted parts 30.

[0075] Optionally, the top guard plate 12 also includes a reinforcing structure 124, which is connected to the flat plate portion 121 and / or the protective portion 123. The reinforcing structure 124 is disposed on the side of the protective portion 123 facing each other. By providing the reinforcing structure 124, the overall strength of the top guard plate 12 can be improved.

[0076] like Figure 6 As shown, the second protrusion 122 has a dimension of L1 in the first direction, and the distance between the two third parts 33 in the first direction is L2, where 40mm ≤ L2 - L1 ≤ 120mm. This ensures good current flow performance of the cover assembly 100 and good capacity improvement of the battery 1000. When the value of L2 - L1 is too small, there is insufficient space for the first part 31 of the first terminal post 21 and the rivet 30, which is not conducive to the current flow and heat dissipation of the cover assembly 100, and increases the assembly difficulty of the first terminal post 21 and the rivet 30 with the cover body 10. When the value of L2 - L1 is too large, the proportion of the second protrusion 122 in the first direction becomes smaller, affecting the increase in the size of the fifth protrusion 222 of the electrode group 300, and affecting the increase in the capacity of the battery 1000. For example, the value of L2 - L1 can be 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm or 120mm. In other embodiments, the values ​​of L2-L1 can also be any other value between 40mm and 120mm.

[0077] like Figure 6 As shown, the bracket 11 has a dimension of L3 in the first direction, and 0.5 ≤ L2 / L3 ≤ 0.75, to further ensure a better current-carrying effect for the cover assembly 100 and a better capacity-increasing effect for the battery 1000. When the value of L2 / L3 is too small, the proportion of the second protrusion 122 in the first direction is insufficient, and the protrusion size of the corresponding electrode group 300 is insufficient, affecting the capacity increase of the battery 1000. When the value of L2 / L3 is too large, the proportion of the second protrusion 122 in the first direction is too large, resulting in insufficient space on both sides, and the size of the first electrode post 21 and the first part 31 is small, affecting the current-carrying capacity and heat dissipation effect of the battery 1000. For example, the value of L2 / L3 can be 0.5, 0.55, 0.6, 0.65, 0.7, or 0.75. In other embodiments, the value of L2 / L3 can also be any other value between 0.5 and 0.75.

[0078] like Figure 7 As shown, the cover plate body 10 has a dimension of W in the third direction, meaning the thickness of the battery 1000 is W, where 20mm ≤ 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 W3 can be 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 20mm and 120mm.

[0079] like Figure 7 As shown, the dimension of the protective part 123 in the third direction is T3, meaning the wall thickness of the protective part 123 is T3, where 1.5mm ≤ T3 ≤ 3mm, to ensure that the protective part 123 has sufficient strength. Exemplarily, the value of T2 can be 1.5mm, 2mm, 2.5mm, or 3mm. In other embodiments, the value of T3 can also be any other value between 1.5mm and 3mm.

[0080] like Figure 8 As shown, the protective part 123 protrudes from the first part 31 by a dimension H1 along the second direction, and the second protrusion 122 and the first part 31 by a dimension H2 in the second direction. That is, the height difference between the second protrusion 122 and the protective part 123 is H2, where 2mm ≤ H2 - H1 ≤ 20mm, to ensure a better forming effect of the top cover plate 12. When the value of H2 - H1 is too small, the height difference between the second protrusion 122 and the protective part 123 is insufficient, resulting in a high forming difficulty for the protective part 123, increasing process costs and the weight of the cover plate body 10. When the value of H2 - H1 is too large, the height difference between the second protrusion 122 and the protective part 123 is too large, and the height of the second protrusion 122 is too large, increasing the difficulty of stamping and stretching the second protrusion 122. For example, the value of H2 - H1 can be 2mm, 4mm, 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, or 20mm. In other embodiments, the values ​​of H2-H1 can also be any other value between 2 mm and 20 mm.

[0081] like Figure 8 As shown, the dimension of the connecting portion 112 in the second direction is H3, meaning the height of the connecting portion 112 is H3, where 8mm ≤ H3 ≤ 30mm. This ensures that the second accommodating space 1221 can accommodate the connecting portion 112, while avoiding an excessively large value of H3 that would make molding of the cover plate body 10 difficult. For example, the value of H3 can be 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 24mm, 26mm, 28mm, or 30mm. In other embodiments, the value of H3 can also be any other value between 8mm and 30mm.

[0082] like Figure 8As shown, the wall thickness of the riveting component 30 is T1, where 2mm ≤ T1 ≤ 3.5mm, to ensure that the riveting component 30 has sufficient strength and meets the requirements for current carrying capacity. 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, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, or 3.5mm. In other embodiments, the value of T1 can also be any other value between 2mm and 3.5mm.

[0083] like Figure 8 As shown, the wall thickness of the second protrusion 122 is T2, where 1.2mm ≤ T2 ≤ 2mm, to ensure that the second protrusion 122 has sufficient strength. Exemplarily, the value of T2 can be 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.78mm, 1.8mm, 1.9mm, or 2mm. In other embodiments, the value of T2 can also be any other value between 1.2mm and 2mm.

[0084] like Figure 8 As shown, the included angle between the first protrusion 111 and the connecting portion 112 is N, 90°≤N≤115°, to ensure the molding effect of the first protrusion 111 and reduce the molding difficulty of the first protrusion 111. Exemplarily, the value of N can be 90°, 95°, 100°, 105°, 110°, or 115°. In other embodiments, the value of N can also be any other value between 90° and 115°.

[0085]

[0086] Table 1 shows the relationship between the wall thickness T1 of the riveting part 30, the wall thickness T2 of the second protrusion 122, the wall thickness T3 of the protective part 123, H2-H1, L2-L1, L2 / L3, the height H3 of the connecting part 112, the included angle N between the connecting part 112 and the first protrusion 111, and the thickness W of the battery 1000. Examples 1-6 show the values ​​of T1, T2, T3, H2-H1, L2-L1, L2 / L3, H3, N, and W when the battery 1000 has a yield rate >98%; Comparative Examples 1-6 show the values ​​of H2-H1, L2-L1, and L2 / L3 when the battery 1000 has a yield rate <98%.

[0087] 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.

[0088] In Examples 1-6, the values ​​of T1, T2, T3, H2-H1, L2-L1, L2 / L3, H3, N, and W 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, terminals, electrode groups 300, and tabs 340 are all undamaged and undeformed. The current carrying capacity of the cover plate assembly 100 meets the requirements of battery 1000.

[0089] In Comparative Example 1, the value of H2-H1 is too small, and the height difference between the second protrusion 122 and the protective part 123 is insufficient, which makes it difficult to form the protective part 123, increases the process cost, and increases the weight of the cover plate body 10.

[0090] In Comparative Example 2, the value of H2-H1 is too large, the height difference between the second protrusion 122 and the protective part 123 is too large, the height of the second protrusion 122 is too large, which increases the difficulty of stamping and stretching the second protrusion 122.

[0091] In Comparative Example 3, the L2-L1 value is too small, and there is insufficient space for the first part 31 of the first pole 21 and the riveting part 30, which is not conducive to the overcurrent and heat dissipation of the cover plate assembly 100. In addition, the assembly difficulty of the first pole 21 and the riveting part 30 with the cover plate body 10 is increased.

[0092] In Comparative Example 4, the L2-L1 value is too large, the proportion of the second protrusion 122 in the first direction becomes smaller, which affects the increase in the size of the fifth protrusion 222 of the electrode group 300 and the increase in the capacity of the battery 1000.

[0093] In Comparative Example 5, the value of L2 / L3 is too small, the proportion of the second protrusion 122 in the first direction is insufficient, and the size of the corresponding electrode group 300 protrusion is insufficient, which affects the improvement of the battery capacity 1000.

[0094] In Comparative Example 6, the value of L2 / L3 is too large, the proportion of the second protrusion 122 in the first direction is too large, resulting in insufficient space on both sides. The size of the first pole post 21 and the first part 31 is too small, which affects the current carrying capacity and heat dissipation effect of the battery 1000.

[0095] like Figure 1 As shown, the housing 200 includes alternating second side plates 210 and first side plates 220, which together form a shell-like structure with openings at both ends to accommodate the electrode assembly 300. There are two cover plate assemblies 100, each covering a corresponding opening. One cover plate assembly 100 has a positive electrode post, and the other cover plate assembly 100 has a negative electrode post.

[0096] Optionally, an explosion-proof hole 2101 is provided on the second side plate 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 housing 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 housing 200, preventing the battery 1000 from thermal runaway and exploding or catching fire, and improving the safety of the battery 1000.

[0097] Optionally, the explosion-proof hole 2101 is located in the middle of the second side plate 210 to shorten the exhaust path.

[0098] Optionally, the first side plate 220 includes a first main body portion 221 and a fifth protrusion portion 222. The fifth protrusion portion 222 is formed by extending outward from at least a portion of the first main body portion 221. A groove 1112 is provided on the first protrusion portion 111, and the fifth protrusion portion 222 is inserted into the groove 1112 to improve the connection stability between the housing 200 and the cover plate body 10. By providing the fifth protrusion portion 222, the internal space of the housing 200 is increased, thereby further increasing the volume of the electrode assembly 300 and further improving the capacity of the battery 1000.

[0099] like Figure 1 , Figure 2 , Figure 8 and Figure 9 As shown, the electrode assembly 300 includes a second main body 310, a third protrusion 320 extending outward from at least a portion of the second main body 310, and a fourth protrusion 330 extending outward from at least a portion of the third protrusion 320. The second main body 310 is disposed within the housing 200, a portion of the third protrusion 320 is disposed between two fifth protrusions 222, and another portion of the third protrusion 320 is disposed within a second accommodating space 1221. The fourth protrusion 330 is disposed within the second accommodating space 1221. This arrangement increases the space between the cover plate body 10 and the housing 200, thereby increasing the volume of the electrode assembly 300 and improving the capacity of the battery 1000.

[0100] Optionally, the cover plate assembly 100 also includes a connector 70. The electrode group 300 is provided with an electrode tab 340, which is connected to the third protrusion 320. The electrode post is connected to the electrode tab 340 via the connector 70. By providing the connector 70 between the electrode tab 340 and the electrode post, the position of the electrode post can be adapted, improving the flexibility of the production process.

[0101] In this embodiment, the connector 70 is Z-shaped, and both the first terminal 21 and the second terminal 22 are connected to the connector 70. The tab 340 is L-shaped, and the L-shaped tab 340 is connected to the second main body 310 and the third protrusion 320, as well as to the second terminal 22 and the connector 70, so that the area of ​​the tab 340 is as large as possible, thereby increasing the current-carrying area of ​​the tab 340 and the welding area of ​​the tab 340, improving the current-carrying capacity to meet the requirements of high-capacity fast charging.

[0102] Optionally, the cover assembly 100 further includes a second insulating member 50 disposed between the connector 70 and the cover body 10, which can prevent the connector 70 and the cover body 10 from short-circuiting.

[0103] Optionally, the cover body 10 also has a third accommodating space 1101, and the connector 70 is disposed in the third accommodating space 1101, which can prevent the connector 70 from occupying the internal space of the housing 200, thereby increasing the volume of the electrode assembly 300 that can be accommodated in the housing 200, so as to improve the capacity of the battery 1000.

[0104] Example 2

[0105] 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.

[0106] 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.

[0107] The following examples are for illustrative purposes only. Figure 10As 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] 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 battery, characterized in that, include: A cover plate assembly (100) includes a cover plate body (10), the cover plate body (10) including a bracket (11) and a top guard plate (12), the bracket (11) including a first protrusion (111) and connecting portions (112) disposed on both sides of the first protrusion (111) along a first direction, the first protrusion (111) having a first accommodating space (1111), the first accommodating space (1111) having a notch (11111), the top guard plate (12) including a flat plate (121) and a second protrusion (122) formed by the recess of the flat plate (121), the flat plate (121) covering the notch (11111), the second protrusion (122) having a second accommodating space (1221). The pole assembly (300) includes a third protrusion (320) and a fourth protrusion (330) connected to each other, at least a portion of the third protrusion (320) being disposed in the first accommodating space (1111) and the fourth protrusion (330) being disposed in the second accommodating space (1221).

2. The battery according to claim 1, characterized in that, The cover plate assembly (100) also includes: The pole includes a first pole (21) and a second pole (22), the first pole (21) passing through the flat plate portion (121) and the second pole (22) passing through the connecting portion (112).

3. The battery according to claim 2, characterized in that, The cover plate assembly (100) further includes a riveting member (30), which includes a first part (31), a second part (32) and a third part (33). The first part (31) is connected to the first pole post (21), and the second part (32) is connected to the second pole post (22) on the same side of the first pole post (21). The first part (31) is connected to the second part (32) through the third part (33).

4. The battery according to claim 3, characterized in that, The second protrusion (122) protrudes from the first pole post (21) and / or the first part (31); And / or, the top guard plate (12) further includes a protective part (123) connected to the flat plate part (121), the protective part (123) protruding from the first pole post (21) and / or the first part (31).

5. The battery according to claim 4, characterized in that, The top guard plate (12) also includes a reinforcing structure (124) connected to the flat plate portion (121) and / or the protective portion (123).

6. The battery according to claim 4, characterized in that, The protective part (123) protrudes from the first part (31) in the second direction by a dimension of H1, and the second protrusion (122) and the first part (31) in the second direction have a dimension of H2, 2mm≤H2-H1≤20mm, and the first direction is perpendicular to the second direction.

7. The battery according to claim 3, characterized in that, The second protrusion (122) has a dimension of L1 in the first direction, and the distance between the two third parts (33) in the first direction is L2, 40mm≤L2-L1≤120mm; And / or, the dimension of the bracket (11) in the first direction is L3, 0.5≤L2 / L3≤0.

75.

8. The battery according to claim 2, characterized in that, The electrode assembly (300) is provided with an electrode tab (340), the electrode tab (340) is connected to the third protrusion (320), and the cover plate assembly (100) further includes a connector (70), the electrode post is connected to the electrode tab (340) through the connector (70).

9. The battery according to any one of claims 1-8, characterized in that, The battery also includes a housing (200), the housing (200) includes a first side plate (220), the first side plate (220) includes a first main body part (221) and a fifth protrusion part (222) connected to each other, the first protrusion part (111) has a groove (1112), and the fifth protrusion part (222) is inserted into the groove (1112).

10. An electrical appliance, comprising an electrical appliance body, characterized in that, It also includes the battery as described in any one of claims 1-9.

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