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 shell, a pole group and a cover plate assembly, the shell comprises a first side plate, a second side plate and a connecting side plate, the first side plate and the second side plate are alternately connected, the second side plate comprises a main body part and a protruding part, the main body part is connected with the first side plate, the protruding part is arranged at at least one end of the main body part in the first direction, and the connecting side plate is connected to the protruding part. The size of the first side plate in the first direction is smaller than that of the main body part, the first side plate, the second side plate and the connecting side plate jointly form a containing space with a Z-shaped opening, the cover plate assembly comprises a cover plate body, the cover plate body is Z-shaped and covers the Z-shaped opening, and the pole group is arranged in the containing space. According to the battery, the internal space of the shell is increased, so that the volume of the pole group is increased, the capacity and the energy density of the battery are improved, the battery can adapt to specific application scene requirements, and space resources are fully utilized; and the deformation resistance of the cover plate body is 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] Against the backdrop of the rapid development of new energy technologies, batteries, as a core component of energy storage, are widely used in various fields such as electric vehicles, energy storage power stations, and portable electronic devices. As market demands for battery performance continue to increase, the need for improved battery capacity and safety performance is becoming increasingly urgent.

[0003] Batteries typically consist of a casing and a cover that spans the opening of the casing. In related technologies, the casing is usually designed as a regular rectangular structure, and the cover is typically a flat metal plate. This standardized design offers certain conveniences in manufacturing and enables mass production. However, in practical applications, the following problems exist:

[0004] 1) Due to the significant differences in the requirements for the shape, size and spatial layout of batteries under different operating conditions, regular rectangular casings are difficult to adapt to complex and ever-changing installation environments, and cannot make full use of limited space resources, resulting in difficulty in improving the overall energy density of the battery system and failing to meet the ever-increasing demand for capacity expansion.

[0005] 2) Due to its thin thickness and large planar span, the flat cover plate 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.

[0006] Therefore, there is an urgent need for a battery and power supply device to solve the above problems. Summary of the Invention

[0007] The purpose of this invention is to provide a battery and an electrical device that increases the internal space of the casing, thereby increasing the volume of the electrode assembly, improving the battery capacity and energy density, adapting to specific application scenarios, making full use of space resources, and improving the deformation resistance of the cover plate body.

[0008] To achieve the above objectives, the following technical solution is provided:

[0009] A battery comprising:

[0010] The housing includes a first side plate, a second side plate, and a connecting side plate. The first side plate and the second side plate are alternately connected. The second side plate includes a main body and a protrusion. The main body is connected to the first side plate. The protrusion is disposed at at least one end of the main body along a first direction. The connecting side plate is connected to the protrusion. The dimension of the first side plate along the first direction is smaller than the dimension of the main body. The first side plate, the second side plate, and the connecting side plate together form an accommodating space with a Z-shaped opening.

[0011] A cover plate assembly includes a cover plate body, the cover plate body being Z-shaped and covering the Z-shaped opening;

[0012] The pole group is disposed within the accommodating space.

[0013] As an optional embodiment of the battery provided by the present invention, a first reinforcing structure is provided on the second side plate;

[0014] And / or, a second reinforcing structure is provided on the connecting side plate.

[0015] As an optional solution for the battery provided by the present invention, the minimum distance between the first reinforcing structure and the edge of the second side plate is W1, where 4mm≤W1≤10mm.

[0016] As an alternative embodiment of the battery provided by the present invention, the protrusion is centrally disposed on the main body along the second direction to form two identical Z-shaped openings on the same side of the main body along the first direction, wherein the first direction is perpendicular to the second direction.

[0017] As an optional embodiment of the battery provided by the present invention, the size of the casing in the second direction is W2, and the maximum spacing of the Z-shaped opening in the second direction is W3, 6mm≤W2-W3≤20mm;

[0018] And / or, the dimension of the protrusion in the second direction is W4, 0.33≤W4 / W2≤0.55.

[0019] As an optional solution for the battery provided by the present invention, the cover plate body includes a flat plate portion, an inclined portion and a connecting portion connected together. The inclined portion and the flat plate portion are respectively disposed on both sides of the flat plate portion. The connecting portion is connected to the first side plate and the second side plate. The flat plate portion is connected to the second side plate. The inclined portion is connected to the protrusion portion.

[0020] As an optional embodiment of the battery provided by the present invention, the electrode assembly is provided with L-shaped tabs, and the cover plate assembly further includes:

[0021] The electrode post and the connector are provided, wherein the electrode post passes through the flat plate and the connector, the connector is L-shaped and located inside the connecting part and the flat plate, and the electrode lug is connected to the connector and the electrode post.

[0022] As an alternative embodiment of the battery provided by the present invention, the top surface of the protrusion is set higher than the terminal post.

[0023] As an optional embodiment of the battery provided by the present invention, the dimension of the electrode post in the first direction is E1, the dimension of the electrode post in the third direction is E2, 1≤E1 / E2≤4, and the first direction is perpendicular to the third direction.

[0024] An electrical device includes a main body and the aforementioned battery.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] The battery provided by this invention increases the internal space of the casing by setting protrusions, thereby increasing the volume of the electrode assembly and improving the battery capacity; it can also adapt to the needs of specific application scenarios and make full use of space resources; when the battery is assembled, the setting of protrusions can optimize assembly efficiency and space utilization; the cover body is set to a Z-shape that matches the Z-shaped opening, which can improve the deformation resistance of the cover body compared with the traditional flat cover.

[0027] The electrical device provided by the present invention, by using the above-mentioned battery, has good resistance to deformation and high capacity and energy density, thereby improving the endurance and service life of the electrical device. 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 schematic diagram of the shell structure provided in Embodiment 1 of the present invention;

[0032] Figure 4 This is a partial structural schematic diagram of the shell provided in Embodiment 1 of the present invention;

[0033] Figure 5 This is a partial cross-sectional view of the housing provided in Embodiment 1 of the present invention;

[0034] Figure 6 This is a first structural schematic diagram of the cover plate assembly provided in Embodiment 1 of the present invention;

[0035] Figure 7 This is an exploded view of the cover plate assembly provided in Embodiment 1 of the present invention;

[0036] Figure 8 This is a schematic diagram of the second structure of the cover plate assembly provided in Embodiment 1 of the invention;

[0037] Figure 9 A schematic diagram of the third structure of the cover plate assembly provided in Embodiment 1 of the invention;

[0038] Figure 10 for Figure 9 Sectional view at point AA;

[0039] Figure 11 for Figure 9 Sectional view at point BB;

[0040] Figure 12 This is a structural schematic diagram of the vehicle provided in Embodiment 2 of the present invention.

[0041] Figure label:

[0042] 10000, vehicles;

[0043] 1000, battery;

[0044] 100. Cover plate assembly; 110. Cover plate body; 111. Flat plate portion; 112. Inclined portion; 1121. Limiting groove; 113. Connecting portion; 1131. Sealing portion; 1132. Butt joint portion; 120. Pole post; 121. Column portion; 122. Plate portion; 130. Riveting component; 131. First part; 132. Second part; 140. First insulating component; 150. Second insulating component; 160. Sealing component; 161. First sealing part; 162. Second sealing part; 170. Connecting component;

[0045] 200, Shell; 2001, Z-shaped opening; 210, First side plate; 211, Explosion-proof hole; 220, Second side plate; 221, Main body; 222, Protrusion; 223, First reinforcing structure; 230, Connecting side plate; 231, Second reinforcing structure;

[0046] 300, Electrode Group; 310, Electrode Sheet;

[0047] 2000, controller; 3000, motor. Detailed Implementation

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] Example 1

[0055] 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.

[0056] 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.

[0057] 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.

[0058] Optionally, the cover assembly 100 includes a cover body 110, 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.

[0059] like Figure 1and Figure 3 As shown, the housing 200 includes a first side plate 210, a second side plate 220, and a connecting side plate 230. The first side plate 210 and the second side plate 220 are alternately connected. The second side plate 220 includes a main body portion 221 and a protrusion portion 222. The main body portion 221 is connected to the first side plate 210. The protrusion portion 222 is disposed at at least one end of the main body portion 221 along a first direction. The connecting side plate 230 is connected to the protrusion portion 222. The dimension of the first side plate 210 along the first direction is smaller than the dimension of the main body portion 221. The first side plate 210, the second side plate 220, and the connecting side plate 230 together form an accommodating space with a Z-shaped opening 2001. The cover plate body 110 is adapted to the shape of the Z-shaped opening 2001, that is, the cover plate body 110 is Z-shaped and covers the Z-shaped opening 2001. The pole assembly 300 is disposed in the accommodating space. By setting the protrusion 222, the internal space of the housing 200 is increased, thereby increasing the volume of the electrode assembly 300 and improving the capacity of the battery 1000; it can also adapt to the needs of specific application scenarios and make full use of space resources; when the battery 1000 is assembled, the setting of the protrusion 222 can optimize the assembly efficiency and space utilization; the cover body 110 is set to a Z-shape that matches the Z-shaped opening 2001. Compared with the traditional flat cover, the Z-shaped cover body 110 can improve the deformation resistance of the cover body 110.

[0060] In this embodiment, the main body 221 has protrusions 222 on both sides along the first direction to further increase the volume of the electrode assembly 300, thereby further increasing the capacity of the battery 1000. During assembly, the connecting side plate 230 on one side is first welded to the protrusion 222, and the connecting side plate 230 on the other side is welded to the protrusion 222 after the electrode assembly 300 is installed in the casing.

[0061] Optionally, at least one first side plate 210 is provided with an explosion-proof hole 211. An explosion-proof valve is welded to the inner wall of the explosion-proof hole 211. 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 explosion-proof hole 211, 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 211 is located in the middle of the first side plate 210 to shorten the exhaust path.

[0062] Optionally, the protrusion 222 is centrally disposed on the main body 221 along the second direction, so that two identical Z-shaped openings 2001 are formed on the same side of the main body 221 along the first direction. That is, the second side plate 220 is symmetrical about the protrusion 222 along a center line parallel to the first direction. Therefore, the two cover plates 110 that cover the corresponding Z-shaped openings 2001 are also the same in size and shape, which helps to reduce manufacturing and assembly difficulties. A cover plate assembly 100 is provided at each Z-shaped opening 2001.

[0063] like Figures 3-5 As shown, a first reinforcing structure 223 is provided on the second side plate 220 to improve the overall strength of the second side plate 220. Optionally, the first reinforcing structure 223 is provided on the second side plate 220 near the Z-shaped opening 2001 to improve the strength at the Z-shaped opening 2001 of the second side plate 220. The first reinforcing structure 223 is a rib formed by stamping on the second side plate 220, which is beneficial to the movement and wetting of the electrolyte at this location.

[0064] Optionally, a second reinforcing structure 231 is provided on the connecting side plate 230 to improve the overall strength of the connecting side plate 230. The second reinforcing structure 231 is a rib formed by stamping on the connecting side plate 230, which is beneficial to the movement and wetting of the electrolyte in this area.

[0065] like Figure 4 As shown, the minimum distance between the first reinforcing structure 223 and the edge of the second side plate 220 is W1, where 4mm ≤ W1 ≤ 10mm, to ensure the overall strength of the second side plate 220 and a good connection effect of the cover. When the value of W1 is too small, the distance between the first reinforcing structure 223 and the edge is insufficient, making it difficult to control the flatness of the second side plate 220 near the Z-shaped opening 2001, affecting the fit of the cover and the welding yield. When the value of W1 is too large, the distance between the first reinforcing structure 223 and the edge is too large, making the second side plate 220 near the Z-shaped opening 2001 prone to deformation and damage. For example, the value of W1 can be 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm. In other embodiments, the value of W1 can also be any other value between 4mm and 10mm.

[0066] Optionally, the width of the first reinforcing structure 223 is W5, where 2mm ≤ W5 ≤ 5mm, to ensure the overall strength of the second side plate 220 and facilitate the processing of the first reinforcing structure 223. For example, the value of W5 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm. In other embodiments, the value of W5 can also be any other value between 2mm and 5mm.

[0067] like Figure 4 As shown, the housing 200 has a dimension of W2 in the second direction, and the protrusion 222 has a dimension of W4 in the second direction, with 0.33 ≤ W4 / W2 ≤ 0.55, to ensure that the protrusion 222 has sufficient strength and the capacity increase effect of the battery 1000. When the value of W4 / W2 is too small, the size proportion of the protrusion 222 in the second direction is insufficient, which on the one hand leads to weak strength of the protrusion 222; on the other hand, it affects the increase in the volume of the electrode group 300, affecting the capacity of the battery 1000; it also leads to an increase in the size of the cover body 110 in the second direction, increasing the cost. When the value of W4 / W2 is too large, the size proportion of the protrusion 222 in the second direction is too large, resulting in insufficient space for the cover bodies 110 on both sides, which cannot meet the fast charging overcurrent requirements of the battery 1000. For example, the value of W4 / W2 can be 0.33, 0.35, 0.4, 0.45, 0.5, or 0.55. In other embodiments, the value of W4 / W2 can also be any other value between 0.33 and 0.55.

[0068] Optionally, the maximum spacing of the Z-shaped opening 2001 in the second direction is W3, where 6mm ≤ W2 - W3 ≤ 20mm, to ensure a better connection effect of the cover. A first rounded corner is provided between the first side plate 210 and the second side plate 220. When the value of W2 - W3 is too small, the distance between the Z-shaped opening 2001 and the first rounded corner is insufficient, which increases the molding difficulty at the corresponding part of the cover body 110, affecting the fit accuracy and welding yield of the cover. When the value of W2 - W3 is too large, the distance between the Z-shaped opening 2001 and the first rounded corner is too large, which increases the size of the corresponding part of the cover body 110, increasing production costs. For example, the value of W2 - W3 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 - W3 can also be any other value between 6mm and 20mm.

[0069] like Figure 5 As shown, the wall thickness of the second side plate 220 is T4, where 0.25mm ≤ T4 ≤ 0.8mm, to ensure sufficient strength of the second side plate 220. Exemplarily, the value of T4 can be 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, or 0.8mm. In other embodiments, the value of T4 can also be any other value between 0.25mm and 0.8mm.

[0070] Optionally, the casing 200 has a third-dimensional dimension of W6, meaning the overall thickness of the battery 1000 is W6, where 14mm ≤ W6 ≤ 120mm. This avoids the drawbacks of an excessively thin battery 1000, such as insufficient structural strength, limited capacity, and performance; and avoids the drawbacks of an excessively thick battery 1000, such as low heat dissipation efficiency and susceptibility to thermal runaway. For example, the value of W6 can be 14mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, 105mm, 110mm, 115mm, or 120mm. In other embodiments, the value of W6 can also be any other value between 14mm and 120mm.

[0071] Table 1

[0072]

[0073]

[0074]

[0075] Table 1 shows the relationship between the wall thickness T4 of the second side plate 220, the minimum distance W1 between the first reinforcing structure 223 and the edge of the second side plate 220, the width W5, W2-W3, W4 / W2 of the first reinforcing structure 223, and the dimension W6 of the housing 200 in a third direction. Examples 1-6 show the values ​​of T4, W1, W5, W2-W3, W4 / W2, and W6 when the yield of the battery 1000 is >98%; Comparative Examples 1-6 show the values ​​of W1, W2-W3, and W4 / W2 when the yield of the battery 1000 is <98%.

[0076] 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.

[0077] In Examples 1-6, the values ​​of T4, W1, W5, W2-W3, W4 / W2, and W6 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 110 and the casing 200. The riveting parts 130, terminal posts 120, 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.

[0078] In Comparative Example 1, the minimum distance W1 between the first reinforcing structure 223 and the edge of the second side plate 220 is too small, and the distance between the first reinforcing structure 223 and the edge is insufficient, which makes it difficult to control the flatness of the second side plate 220 near the Z-shaped opening 2001, affecting the fit of the shell cover and the welding yield.

[0079] In Comparative Example 2, the minimum distance W1 between the first reinforcing structure 223 and the edge of the second side plate 220 is too large, and the distance between the first reinforcing structure 223 and the edge is too large, which makes the second side plate 220 prone to deformation and damage near the Z-shaped opening 2001.

[0080] In Comparative Example 3, the W2-W3 values ​​are too small, and the distance between the Z-shaped opening 2001 and the first rounded corner is insufficient, which increases the difficulty of forming the corresponding part of the cover body 110, affecting the fit accuracy of the shell and cover and the welding yield.

[0081] In Comparative Example 4, the values ​​of W2-W3 are too large, and the distance between the Z-shaped opening 2001 and the first rounded corner is too large, which leads to an increase in the size of the corresponding part of the cover plate body 110 and increases the production cost.

[0082] In Comparative Example 5, the value of W4 / W2 is too small, and the size ratio of the protrusion 222 in the second direction is insufficient. On the one hand, this results in the protrusion 222 being weak; on the other hand, it affects the increase in the volume of the electrode assembly 300 and the capacity of the battery 1000; it also leads to an increase in the size of the cover body 110 in the second direction, increasing the cost.

[0083] In Comparative Example 6, the value of W4 / W2 is too large, and the size of the protrusion 222 in the second direction is too large, resulting in insufficient space on both sides of the cover plate, which cannot meet the fast charging overcurrent requirements of the 1000 battery.

[0084] like Figure 2 , Figure 6 and Figure 7 As shown, the cover body 110 includes a flat plate portion 111, an inclined portion 112, and a connecting portion 113 connected together. The inclined portion 112 and the flat plate portion 111 are respectively disposed on both sides of the flat plate portion 111, so that the cover body 110 is Z-shaped. The connecting portion 113 is connected to the first side plate 210 and the second side plate 220, the flat plate portion 111 is connected to the second side plate 220, and the inclined portion 112 is connected to the protrusion 222, thereby realizing the encapsulation of the Z-shaped opening 2001 of the earth shell 200. Compared with the traditional flat plate cover, the Z-shaped cover body 110 greatly improves the resistance to deformation.

[0085] like Figures 6-9 As shown, the connecting part 113 includes a sealing part 1131 and a docking part 1132 erected on the sealing part 1131. The sealing part 1131 is connected to the first side plate 210, and the docking part 1132 is connected to the second side plate 220 to improve the connection effect of the shell cover.

[0086] Optionally, a first rounded corner is provided between the first side plate 210 and the second side plate 220, and a second rounded corner is provided between the sealing part 1131 and the mating part 1132. The radii of the first rounded corner and the second rounded corner are equal to ensure that the housing 200 and the connecting part 113 are compatible.

[0087] Optionally, the connecting part 113 is perpendicular to the flat part 111 to ensure a better connection between the connecting part 113 and the first side plate 210 and the second side plate 220, thereby reducing the difficulty of assembling and positioning the cover.

[0088] like Figure 8 As shown, the dimension of the connecting part 113 in the second direction is L1, and the dimension of the sealing part 1131 in the second direction is L2, where 2.5 ≤ L1 - L2 ≤ 8 mm, to ensure a good connection effect of the cover. When the value of L1 - L2 is too small, the second fillet dimension between the sealing part 1131 and the mating part 1132 is insufficient, resulting in low forming accuracy at the second fillet and affecting the welding yield of the cover. When the value of L1 - L2 is too large, the size of the mating part 1132 is too large, resulting in increased weight and cost of the cover body 110; it also results in a larger cut in the main body 221, which is prone to deformation and makes welding the electrode tab 310 inconvenient. For example, the value of L1 - L2 can be 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, or 8 mm. In other embodiments, the value of L1 - L2 can also be any other value between 2.5 mm and 8 mm.

[0089] like Figure 10 As shown, the dimension of the connecting portion 113 in the first direction is H1, and the dimension of the inclined portion 112 in the first direction is H2, where 30mm ≤ H1 + H2 ≤ 140mm. This ensures the increased capacity of the battery 1000 and reduces production costs. When the value of H1 + H2 is too small, the dimensions of the connecting portion 113 and the inclined portion 112 in the first direction are insufficient, affecting the capacity increase of the battery 1000. When the value of H1 + H2 is too large, the dimensions of the connecting portion 113 and the inclined portion 112 in the first direction are too large, leading to increased weight and cost of the cover plate. For example, the value of H1 + H2 can be 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, or 140mm. In other embodiments, the value of H1 + H2 can also be any other value between 30mm and 140mm.

[0090] Optionally, the dimension H2 of the inclined portion 112 in the first direction satisfies: 15mm ≤ H2 ≤ 60mm, to ensure the capacity increase effect of the battery 1000. For example, the value of H2 can be 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, or 60mm. In other embodiments, the value of H2 can also be any other value between 15mm and 60mm.

[0091] like Figure 10 As shown, the included angle between the inclined portion 112 and the flat portion 111 is N, 90°≤N≤135°, to ensure the capacity increase effect of the battery 1000 and facilitate the processing and forming of the cover body 110. When the value of N is too small, the included angle between the flat portion 111 and the inclined portion 112 is too small, which is not conducive to the processing of the housing 200 and the electrode assembly 300, and also increases the assembly difficulty. When the value of N is too large, the included angle between the flat portion 111 and the inclined portion 112 is too large, resulting in insufficient dimensional increase of the middle electrode assembly 300 at the protrusion 222, affecting the capacity of the battery 1000. Exemplarily, the value of N can be 90°, 95°, 100°, 105°, 110°, 115°, 120°, 125°, 130° or 135°. In other embodiments, the value of N can also be any other value between 90° and 135°.

[0092] Optionally, the dimension of the plate portion 111 in the second direction is L3, that is, the length of the plate portion 111 is L3, 50mm≤L3≤150mm, to avoid the plate portion 111 being too short and affecting the sealing and the flow capacity of the pole 120; at the same time, to avoid the plate portion 111 being too long, which would lead to stress concentration and cost waste. Exemplarily, the value of L3 can be 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, or 150mm. In other embodiments, the value of L3 can also be any other value between 50mm and 150mm.

[0093] In this embodiment, the wall thickness of the plate portion 111 is T1, and the value of T1 is 2mm, so as to ensure that the plate portion 111 has sufficient strength.

[0094] like Figure 2 , Figures 6-11As shown, the cover plate assembly 100 also includes a terminal post 120 and a riveting member 130. The terminal post 120 passes through the flat plate portion 111, and the riveting member 130 is connected to the terminal post 120. An inclined portion 112 protrudes from the terminal post 120 and / or the riveting member 130. That is, the top surface of the protrusion 222 is higher than the terminal post 120. Through the above arrangement, the protrusion 222 and the inclined portion 112 can protect the terminal post 120 and the riveting member 130, reducing the possibility of the terminal post 120 and the riveting member 130 being bumped or damaged during the manufacturing process. The top surface of the protrusion 222 is higher than the terminal post 120, providing space for the connecting piece during the assembly of the battery 1000, thereby saving module assembly space, increasing module assembly rate, and thus improving the performance of the battery 1000. Understandably, the connecting piece is used to connect with the riveting piece 130 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 piece, etc.

[0095] Optionally, the terminal post 120 includes a post body 121 and a plate body 122. The post body 121 passes through the plate body 111. The rivet 130 is disposed on the outside of the cover plate body 110. The terminal post 120 passes through the inside of the cover plate body 110 and is riveted to the rivet 130. The plate body 111 is sandwiched in the middle by the plate body 122 and the rivet 130, so that the terminal post 120 and the rivet 130 are respectively assembled with the cover plate body 110. The plate body 122 of the terminal post 120 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 120, so that the battery 1000 can be charged and discharged.

[0096] Optionally, the tab 310 of the electrode assembly 300 is L-shaped. The cover plate assembly 100 also includes a connector 170. The terminal post 120 passes through the flat plate portion 111 and the connector 170. The connector 170 is L-shaped and located inside the connecting portion 113 and the flat plate portion 111. The tab 310 is connected to the connector 170 and the terminal post 120. By setting the L-shaped tab 310 to connect with the terminal post 120 and the connector 170, the area of ​​the tab 310 can be maximized, thereby increasing the current-carrying area and welding area of ​​the tab 310, improving the current-carrying capacity to meet the requirements of high-capacity fast charging.

[0097] like Figure 10 As shown, the wall thickness of connector 170 is T3, where 1.5mm ≤ T3 ≤ 2mm, to ensure that connector 170 has sufficient strength and flow capacity. Exemplarily, the value of T3 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, or 2mm. In other embodiments, the value of T3 can also be any other value between 1.5mm and 2mm.

[0098] like Figure 10 and Figure 11 As shown, the pole post 120 (specifically, the column portion 121) has a dimension of E1 in the first direction, and the pole post 120 (specifically, the column portion 121) has a dimension of E2 in the third direction, where 1 ≤ E1 / E2 ≤ 4, to increase the effective connection area between the pole post 120 and the tab 310 and improve current distribution. Exemplarily, the value of E1 / E2 can be 1, 1.5, 2, 2.5, 3, 3.5, or 4. In other embodiments, the value of E1 / E2 can also be any other value between 1 and 4.

[0099] Optionally, the riveting member 130 includes a first part 131 and a second part 132 connected to each other. The first part 131 is connected to the pole post 120 and is located outside the flat plate part 111, while the second part 132 is located outside the inclined part 112. This arrangement increases the weldable area of ​​the riveting member 130, thereby improving the flow capacity of the cover plate assembly 100.

[0100] Optionally, the wall thickness of the riveting member 130 is T2, where 2mm ≤ T2 ≤ 3.5mm, to ensure that the riveting member 130 has sufficient strength and flow 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.

[0101] Table 2

[0102]

[0103]

[0104]

[0105] Table 2 shows the relationships between the wall thickness T1 of the flat plate portion 111, the wall thickness T2 of the riveting member 130, the wall thickness T3 of the connecting member 170, E1 / E2, L1-L2, H1+H2, the dimension H2 of the inclined portion 112 in the first direction, the included angle N between the flat plate portion 111 and the inclined portion 112, and the dimension L3 of the flat plate portion 111 in the second direction. Examples 7-12 show the values ​​of T1, T2, T3, E1 / E2, L1-L2, H1+H2, H2, N, and L3 when the yield of the battery 1000 is >98%; Comparative Examples 7-12 show the values ​​of L1-L2, H1+H2, and N when the yield of the battery 1000 is <98%.

[0106] 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.

[0107] In Examples 7-12, the values ​​of T1, T2, T3, E1 / E2, L1-L2, H1+H2, H2, N, and L3 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 110 and the casing 200. The riveting parts 130, terminal posts 120, 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.

[0108] In Comparative Example 7, the values ​​of L1-L2 are too small, and the second fillet size between the sealing part 1131 and the mating part 1132 is insufficient, resulting in low forming accuracy at the second fillet and affecting the welding yield of the shell cover.

[0109] In Comparative Example 8, the values ​​of L1-L2 are too large, and the size of the mating part 1132 is too large, which increases the weight and cost of the cover plate body 110; it also results in a larger cut in the main body 221, which is prone to deformation and makes welding the electrode tab 310 inconvenient.

[0110] In Comparative Example 9, the value of H1+H2 is too small, and the dimensions of the connecting part 113 and the inclined part 112 in the first direction are insufficient, which affects the increase of the battery capacity 1000.

[0111] In Comparative Example 10, the value of H1+H2 is too large, and the dimensions of the connecting part 113 and the inclined part 112 in the first direction are too large, resulting in an increase in the weight and cost of the cover plate.

[0112] In Comparative Example 11, the angle N between the flat plate portion 111 and the inclined portion 112 is too small. The small angle between the flat plate portion 111 and the inclined portion 112 is not conducive to the processing of the housing 200 and the pole group 300, and also increases the assembly difficulty.

[0113] In Comparative Example 12, the angle N between the flat plate portion 111 and the inclined portion 112 is too large, resulting in insufficient size increase of the central electrode assembly 300 at the protrusion 222, which affects the capacity of the battery 1000.

[0114] Optionally, the cover plate assembly 100 further includes a first insulating member 140 disposed between the riveting member 130 and the cover plate body 110 to ensure insulation between the riveting member 130 and the cover plate body 110 and to prevent short circuit between the riveting member 130 and the cover plate body 110.

[0115] Optionally, the inclined portion 112 is provided with a limiting groove 1121, and at least a portion of the first insulating member 140 is disposed in the limiting groove 1121 to improve the torsional strength of the riveted member 130.

[0116] Optionally, the cover assembly 100 further includes a second insulating member 150, which is disposed between the connector 170 and the cover body 110 to prevent short circuit between the connector 170 and the cover body 110.

[0117] Optionally, the cover plate assembly 100 further includes a seal 160, which is sandwiched between the electrode post 120 and the cover plate body 110. The seal 160 can insulate and isolate the electrode post 120 and the cover plate body 110 to prevent short circuit between the electrode post 120 and the cover plate body 110. At the same time, the seal 160 can seal the gap between the post portion 121 and the cover plate body 110 to prevent leakage of electrolyte or gas.

[0118] Optionally, the seal 160 includes a first sealing portion 161 and a second sealing portion 162. The second sealing portion 162 is disposed around the outer periphery of the first sealing portion 161 and is located at one end of the first sealing portion 161 in the axial direction, so that the cross section of the seal 160 is L-shaped. The first sealing portion 161 is sleeved on the outer peripheral surface of the pole post 120 and can be compressed by the cover plate body 110 and the pole portion 121 of the pole post 120. The second sealing portion 162 is sandwiched between the cover plate body 110 and the plate portion 122 to improve the sealing effect of the seal 160.

[0119] Example 2

[0120] 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.

[0121] 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.

[0122] The following examples are for illustrative purposes only. Figure 12 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.

[0123] 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.

[0124] 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.

[0125] 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.

[0126] 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: The housing (200) includes a first side plate (210), a second side plate (220), and a connecting side plate (230). The first side plate (210) and the second side plate (220) are alternately connected. The second side plate (220) includes a main body (221) and a protrusion (222). The main body (221) is connected to the first side plate (210). The protrusion (222) is disposed at at least one end of the main body (221) along a first direction. The connecting side plate (230) is connected to the protrusion (222). The size of the first side plate (210) along the first direction is smaller than the size of the main body (221). The first side plate (210), the second side plate (220), and the connecting side plate (230) together form an accommodating space with a Z-shaped opening (2001). A cover plate assembly (100) includes a cover plate body (110) which is Z-shaped and covers the Z-shaped opening (2001); The pole group (300) is disposed within the accommodating space.

2. The battery according to claim 1, characterized in that, The second side plate (220) is provided with a first reinforcing structure (223); And / or, a second reinforcing structure (231) is provided on the connecting side plate (230).

3. The battery according to claim 2, characterized in that, The minimum distance between the first reinforcing structure (223) and the edge of the second side plate (220) is W1, 4mm≤W1≤10mm.

4. The battery according to claim 1, characterized in that, The protrusion (222) is centrally disposed on the main body (221) along the second direction, so as to form two identical Z-shaped openings (2001) on the same side of the main body (221) along the first direction, wherein the first direction is perpendicular to the second direction.

5. The battery according to claim 4, characterized in that, The housing (200) has a dimension of W2 in the second direction, and the maximum spacing of the Z-shaped openings (2001) in the second direction is W3, where 6mm ≤ W2 - W3 ≤ 20mm; And / or, the size of the protrusion (222) in the second direction is W4, 0.33≤W4 / W2≤0.

55.

6. The battery according to any one of claims 1-5, characterized in that, The cover plate body (110) includes a flat plate portion (111), an inclined portion (112), and a connecting portion (113) connected together. The inclined portion (112) and the flat plate portion (111) are respectively disposed on both sides of the flat plate portion (111). The connecting portion (113) is connected to the first side plate (210) and the second side plate (220). The flat plate portion (111) is connected to the second side plate (220). The inclined portion (112) is connected to the protrusion portion (222).

7. The battery according to claim 6, characterized in that, The electrode assembly (300) is provided with an L-shaped electrode tab (310), and the cover plate assembly (100) further includes: The pole (120) and the connector (170) are provided, wherein the pole (120) passes through the flat plate (111) and the connector (170), the connector (170) is L-shaped and located inside the connecting part (113) and the flat plate (111), and the tab (310) is connected to the connector (170) and the pole (120).

8. The battery according to claim 7, characterized in that, The top surface of the protrusion (222) is higher than the pole post (120).

9. The battery according to claim 7, characterized in that, The pole post (120) has a dimension of E1 in the first direction and a dimension of E2 in the third direction, where 1 ≤ E1 / E2 ≤ 4, and the first direction is perpendicular to the third direction.

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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