A battery cell, a battery device, a power consumption device, and an energy storage device

Abstract

The application provides a battery monomer, a battery device, a power utilization device and an energy storage device. The battery monomer comprises a shell, a top cover assembly and a battery core assembly. The top cover assembly comprises an aluminum sheet, a lower plastic and a pole. In the thickness direction of the top cover assembly, the lower plastic is located on one side of the aluminum sheet. In the aluminum sheet and the lower plastic, one is provided with at least one first protruding part, and the other is provided with at least one first recessed part. At least part of the first recessed part is located in the corresponding first recessed part. Through the design, the stability of the connection between the aluminum sheet and the lower plastic can be improved, and the relative position accuracy of the two can be improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and more particularly to a battery cell, a battery device, an electrical device, and an energy storage device. Background Technology

[0002] With technological advancements, the application of new energy technologies such as batteries is becoming increasingly widespread. A battery includes a top cover assembly, which consists of interconnected aluminum sheets and a lower plastic layer. This seal seals the internal structure, including the battery cells, preventing external impurities from entering the battery and preventing electrolyte leakage. Therefore, the quality of the connection between the aluminum sheet and the lower plastic layer affects the battery's quality and lifespan. Utility Model Content

[0003] This application provides a battery cell, a battery device, an electrical device, and an energy storage device to improve the stability of the connection between the aluminum sheet and the lower plastic sheet.

[0004] This application provides a battery cell, which includes a housing, a top cover assembly, and a cell assembly. The housing has a receiving cavity, the cell assembly is located in the receiving cavity, and the top cover assembly is connected to the housing. The top cover assembly includes an aluminum sheet, a lower plastic component, and an electrode post. The electrode post is disposed on the aluminum sheet and electrically connected to the battery cell assembly. Along the thickness direction of the top cover assembly, the lower plastic component is located on one side of the aluminum sheet. In this embodiment, one of the aluminum sheet and the lower plastic sheet is provided with at least one first protrusion, and the other is provided with at least one first recess, wherein at least a portion of the first protrusion is located in the corresponding first recess.

[0005] In one possible implementation, the size of the first protrusion is a along the thickness direction of the top cover assembly, and the size of the first protrusion is b along the length or width direction of the top cover assembly, and a≥b.

[0006] In one possible implementation, the size of the first protrusion is 0.5 mm to 1.5 mm in the thickness direction of the top cover assembly, and the size of the first protrusion is 0.5 mm to 1 mm in the length or width direction of the top cover assembly.

[0007] In one possible implementation, the first protrusion has an angle with the thickness direction of the top cover assembly, and the angle c satisfies: 0° < c < 90°.

[0008] In one possible implementation, the aluminum sheet includes at least two first protrusions, and the tilt direction of at least one first protrusion is opposite to the tilt direction of the other first protrusions.

[0009] In one possible implementation, the angle between the first protrusion and the thickness direction of the top cover assembly is c, and 10°≤c≤45°.

[0010] In one possible implementation, the first protrusion is integrally formed on the aluminum sheet.

[0011] In one possible implementation, the top cover assembly includes a top patch, and along the thickness direction of the top cover assembly, the opposite sides of the aluminum sheet are a first surface and a second surface, respectively, the first surface contacting the top patch and the second surface contacting the lower plastic. The first protrusion is disposed on the second surface, and the first surface is provided with a second recess. The second recess is recessed in a direction close to the second surface. At least one plane perpendicular to the thickness direction of the top cover assembly is defined as a first plane. The projection of the second recess onto the first plane is located within the projection range of the first protrusion onto the first plane.

[0012] In one possible implementation, the protrusion direction of the first protrusion is parallel to the concave direction of the second recess, or there is an angle between the protrusion direction of the first protrusion and the concave direction of the second recess.

[0013] In one possible implementation, along the thickness direction of the top cover assembly, the lower plastic has a third surface and a fourth surface on opposite sides, the third surface being in contact with the aluminum sheet, and the fourth surface being located on the side of the lower plastic away from the aluminum sheet. The first recess is located on the third surface, and the fourth surface is provided with a second protrusion. The second protrusion protrudes in a direction away from the third surface. At least one surface perpendicular to the thickness direction of the top cover assembly is defined as a second plane. The projection of the first recess onto the second plane is located within the projection range of the second protrusion onto the second plane.

[0014] In one possible implementation, the protrusion direction of the second protrusion is parallel to the concave direction of the first recess, or the protrusion direction of the second protrusion has an angle with respect to the concave direction of the first recess.

[0015] In one possible implementation, the lower plastic includes at least a first main body portion and a second main body portion, the first main body portion and the second main body portion being disposed and connected along the length direction of the battery cell, and the first main body portion and the second main body portion being respectively provided with the first protrusion portion or the first recess portion.

[0016] In one possible implementation, the tilting direction of the first protrusion located in the first main body is opposite to the tilting direction of the first protrusion located in the second main body, or the tilting direction of the first recess located in the first main body is opposite to the tilting direction of the first recess located in the second main body.

[0017] This application also provides a battery device, which includes any of the battery cells described above, and the battery device includes one or more of the following: battery module, battery pack, and energy storage battery.

[0018] This application embodiment also provides an electrical device, which includes the battery device described above, and the battery device is used to provide electrical energy.

[0019] This application also provides an energy storage device, which includes the battery device described above, and the battery device is used to provide electrical energy.

[0020] This application provides a battery cell, a battery device, a power consumption device, and an energy storage device. The battery cell includes a casing, a top cover assembly, and a cell assembly. The top cover assembly includes an aluminum sheet, a lower plastic layer, and terminals. Along the thickness direction of the top cover assembly, the lower plastic layer is located on one side of the aluminum sheet. One of the aluminum sheet and the lower plastic layer has at least one first protrusion, and the other has at least one first recess. At least a portion of the first recess is located within the corresponding first recess. This design improves the stability of the connection between the aluminum sheet and the lower plastic layer and enhances their relative positional accuracy. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a single battery cell provided in an embodiment of this application; Figure 2 This is an exploded view of a single battery cell provided in an embodiment of this application; Figure 3 A schematic diagram of the top cover assembly provided in an embodiment of this application; Figure 4 This is a cross-sectional view of the top cover assembly provided in an embodiment of this application; Figure 5 for Figure 4 A magnified view of the central position (I). Figure 6 This is a schematic diagram of the aluminum sheet provided in the embodiments of this application; Figure 7 This is a schematic diagram showing another perspective of the aluminum sheet provided in the embodiments of this application; Figure 8 This is a cross-sectional view of the aluminum sheet provided in an embodiment of this application; Figure 9 for Figure 8 A magnified view of a portion of position II; Figure 10 This is a schematic diagram of the lower plastic material provided in an embodiment of this application; Figure 11 This is a schematic diagram showing another perspective of the plastic material provided in an embodiment of this application; Figure 12 This is a cross-sectional view of the lower plastic provided in an embodiment of this application; Figure 13 for Figure 2 A magnified view of a portion of position III; Figure 14 This is a schematic diagram of another embodiment of the plastic material provided in this application.

[0022] Figure Labels 1-Shell; 2-Top cover assembly; 21-Bright aluminum sheet; 211 - First protrusion; 212 - Second recessed portion; 213 - First surface; 214 - Second surface; 22-Underlying plastic; 221 - First recessed portion; 222 - Second protrusion; 223 - Third surface; 224 - Fourth surface; 225 - First Main Body Section; 226-Second main body section; 23-Pole Column; 24-Top patch; 3-Battery cell assembly. Detailed Implementation

[0023] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0024] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0025] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0026] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0027] like Figure 1 and Figure 2 As shown, this application embodiment provides a battery cell, which includes a housing 1, a top cover assembly 2, and a cell assembly 3. The housing 1 has a receiving cavity, in which the cell assembly 3 is located. The top cover assembly 2 is connected to the housing 1 and is used to seal the receiving cavity. The top cover assembly 2 includes a light aluminum sheet 21, a lower plastic sheet 22, and terminals 23. The terminals 23 are disposed on the light aluminum sheet 21 and electrically connected to the cell assembly 3. The top cover assembly 2 typically includes two terminals 23, one positive and the other negative. The cell assembly 3 includes a positive tab and a negative tab. The positive terminal is electrically connected to the positive tab, and the negative terminal is electrically connected to the negative tab. Current can be transmitted between the terminals 23 and the tabs. Figure 3 As shown, the top cover assembly 2 also includes a lower plastic 22. Along the thickness direction of the top cover assembly 2, the lower plastic 22 is located on one side of the aluminum sheet 21, serving to provide internal insulation protection for the battery cells and prevent electrolyte leakage. The lower plastic 22 is located on the side of the aluminum sheet 21 facing the receiving cavity. The lower plastic 22 serves to insulate and isolate the tabs, terminals 23, and aluminum sheet 21, preventing internal short circuits in the battery cells. Simultaneously, the electrolyte has a certain chemical activity; when the electrolyte directly contacts components such as the aluminum sheet 21, it will cause corrosion. Therefore, by setting the lower plastic 22, it can prevent the electrolyte from contacting the aluminum sheet 21 and other structures, and also prevent external dust and moisture from entering the battery cells. Figure 4 and Figure 5 As shown, in the aluminum sheet 21 and the lower plastic sheet 22, one is provided with at least one first protrusion 211, and the other is provided with at least one first recess 221, with at least a portion of the first protrusion 211 located in the first recess 221.

[0028] This design facilitates the connection between the lower plastic 22 and the aluminum sheet 21. The cooperation between the first protrusion 211 and the first recess 221 serves a positioning function. While connecting, it also restricts the relative position of the lower plastic 22 and the aluminum sheet 21, thereby improving the relative positional accuracy of the lower plastic 22 and the aluminum sheet 21. This enhances the sealing and insulation effect of the lower plastic 22, reducing the possibility of external impurities entering the battery cell and electrolyte leakage from the battery cell.

[0029] like Figure 5As shown, in one possible implementation, the size of the first protrusion 211 is a along the thickness direction of the top cover assembly 2, and the size of the first protrusion 211 is b along the length or width direction of the top cover assembly 2, and a≥b.

[0030] This design facilitates the insertion of the first protrusion 211 into the first recess 221 and increases the contact area between the first protrusion 211 and the inner wall of the first recess 221 along the circumferential direction. This reduces the possibility of relative movement between the lower plastic 22 and the aluminum sheet 21 along the length or width of the top cover assembly 2, thereby improving the stability and relative positional accuracy of the fit between the lower plastic 22 and the aluminum sheet 21, which better meets actual usage requirements.

[0031] like Figure 5 As shown, in one possible embodiment, the size of the first protrusion 211 is 0.5 mm to 1.5 mm along the thickness direction of the top cover assembly 2, and 0.5 mm to 1 mm along the length or width direction of the top cover assembly 2. The size of the first protrusion 211 along the thickness direction of the top cover assembly 2 can be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1.0 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, etc. The size of the first protrusion 211 along the length or width direction of the top cover assembly 2 can be 0.50 mm, 0.55 mm, 0.60 mm, 0.65 mm, 0.70 mm, 0.75 mm, 0.80 mm, 0.85 mm, 0.90 mm, 0.95 mm, 1.00 mm, etc.

[0032] This design improves the stability of the fit between the first protrusion 211 and the lower plastic 22 while reducing the space occupied by the first protrusion 211, thereby reducing the overall volume of the top cover assembly 2. When the size of the first protrusion 211 is too small, the connection stability between the aluminum sheet 21 and the lower plastic 22 is poor. When the size of the first protrusion 211 is too large, the space occupied by the first protrusion 211 is large, which in turn affects the capacity of the battery cell.

[0033] like Figure 5 As shown, in one possible implementation, the first protrusion 211 has an angle c with the thickness direction of the top cover assembly 2, where the angle c satisfies: 0° < c < 90°. The angle c can be 1°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 89°, etc. The first recess 221 can be structurally configured to correspond to the first protrusion 211, that is, the first recess 221 also has an angle with the thickness direction of the top cover assembly 2, and the degree of the angle is the same as or approximately the same as the angle between the first protrusion 211 and the thickness direction.

[0034] The first protrusion 211 can be inclined relative to the width direction of the top cover assembly 2. This design increases the contact area between the first protrusion 211 and the first recess 221, thereby improving the stability of their fit and reducing the possibility of the first protrusion 211 detaching from the first recess 221. This design allows the first protrusion 211 to abut against the inner wall of the first recess 221 along the thickness direction of the top cover assembly 2, thus limiting relative movement between the aluminum sheet 21 and the lower plastic 22 along the thickness direction of the top cover assembly 2, which could cause the first protrusion 211 to detach from the first recess 221. Therefore, it improves the stability of the fit between the aluminum sheet 21 and the lower plastic 22.

[0035] Meanwhile, since the first protrusion 211 is inclined relative to the thickness direction of the top cover assembly 2, the size of the first protrusion 211 in the thickness direction of the top cover can be reduced, which helps to reduce the thickness of the top cover assembly 2 and reduce the space occupied by the top cover assembly 2 in the battery cell. Under the same volume, the battery cell can have more space to set the cell assembly 3 and electrolyte, which helps to increase the capacity of the battery cell and thus improve the performance of the battery cell.

[0036] In order to facilitate the processing of the first protrusion 211 so that the first protrusion 211 is tilted, the size of the first protrusion 211 can be a greater than the size of the first protrusion 211 is b, and a≥b, so that the first protrusion 211 can be tilted and have an angle with the thickness direction of the top cover assembly 2.

[0037] like Figure 4 As shown, in one possible embodiment, the aluminum sheet 21 is provided with at least two first protrusions 211, and the inclination direction of at least one first protrusion 211 is opposite to the inclination direction of the other first protrusions 211. The first protrusions 211 are provided on the aluminum sheet 21, and the first recesses 221 are provided on the lower plastic 22.

[0038] This design allows the first protrusion 211 to tilt in different directions. When there is relative displacement between the aluminum sheet 21 and the lower plastic 22, the first protrusion 211 and the first recess 221 can be used to limit the movement and prevent the aluminum sheet 21 and the lower plastic 22 from separating.

[0039] As shown in the figure, in one possible implementation, the aluminum sheet 21 may be provided with a plurality of first protrusions 211, and at least two first protrusions 211 are inclined in a direction that approaches or moves away from each other.

[0040] This design allows the first protrusion 211 to have different tilt directions. When relative displacement occurs between the aluminum sheet 21 and the lower plastic 22, at least one of the first protrusions 211 will have a different displacement direction from the direction of separation from the first recess 221. This reduces the possibility of displacement between the aluminum sheet 21 and the lower plastic 22 during battery cell use, when encountering impacts, vibrations, or other situations, leading to separation of the aluminum sheet 21 and the lower plastic 22.

[0041] When the aluminum sheet 21 moves relative to the lower plastic 22 along the thickness direction of the top cover assembly 2, since the first protrusion 211 is inclined relative to the thickness direction of the top cover assembly 2, at least a portion of the surface of the first protrusion 211 is inclined along the thickness direction of the top cover assembly 2 and abuts against the inner wall of the first recess 221. This structure can form an approximate hook structure, thereby preventing the first protrusion 211 from disengaging from the first recess 221, and thus preventing the aluminum sheet 21 and the lower plastic 22 from separating.

[0042] When the aluminum sheet 21 is displaced relative to the lower plastic 22 along the length or width of the top cover assembly 2, at least one of the first protrusions 211 is displaced into the interior of the first recess 221. Therefore, when the aluminum sheet 21 and the lower plastic 22 move relative to each other, at least one of the first protrusions 211 remains engaged with the corresponding first recess 221. Thus, it can be used to limit the aluminum sheet 21 from detaching from the lower plastic 22.

[0043] In the solution provided in this application embodiment, a first protrusion 211 is disposed on the aluminum sheet 21, and a first recess 221 is disposed on the lower plastic 22. The aluminum sheet 21 is typically made of metal and has a certain structural strength, while the lower plastic 22 typically has a certain elasticity. When the first protrusion 211 and the first recess 221 are engaged, the first protrusion 211 is less likely to deform, thus maintaining its position and shape and reducing the possibility of the first protrusion 211 detaching from the first recess 221 due to deformation. The first recess 221 is disposed on the elastic lower plastic 22. During installation, the lower plastic 22 can deform to facilitate the insertion of the first protrusion 211 into the first recess 221, reducing the difficulty of engagement between the aluminum sheet 21 and the lower plastic 22, improving assembly efficiency, and better meeting actual production needs.

[0044] In one possible implementation, the included angle c between the first protrusion 211 and the thickness direction of the top cover assembly 2 is 10° to 45°, and the included angle c can be 10°, 14°, 18°, 22°, 26°, 30°, 34°, 38°, 42°, 45°, etc.

[0045] When the angle between the first protrusion 211 and the thickness direction of the top cover assembly 2 is too small, the tilt angle of the first protrusion 211 is too small, and the contact area between the interior of the first protrusion 211 and the interior of the first recess 221 along the thickness direction of the top cover assembly 2 is small. When the aluminum sheet 21 moves relative to the lower plastic 22 along the thickness direction of the top cover assembly 2, the limiting effect of the first protrusion 211 and the first recess 221 is poor, and the aluminum sheet 21 and the lower plastic 22 are easy to separate. When the tilt angle of the first protrusion 211 is too large, the first protrusion 211 extends more in a direction parallel to the aluminum sheet 21 or the lower plastic 22, making installation more difficult, and the first protrusion 211 is difficult to cooperate with the first recess 221. Therefore, when the angle between the first protrusion 211 and the thickness direction of the top cover assembly 2 is 10° to 45°, the difficulty of fitting the first protrusion 211 and the first recess 221 can be reduced, and the first protrusion 211 and the first recess 221 can also have better fitting stability, thereby improving the connection stability between the aluminum sheet 21 and the lower plastic 22, which is more in line with actual usage requirements.

[0046] The dimension of the first protrusion 211 along the thickness direction of the top cover assembly 2 is larger than the dimension of the first protrusion 211 along the length or width direction of the top cover assembly 2. When bending the first protrusion 211, it can be bent in the direction of the smaller dimension. That is, when the dimension of the first protrusion 211 along the length direction of the top cover assembly 2 is smaller, a force can be applied to the first protrusion 211 along the length direction of the top cover assembly 2 during bending, so that the first protrusion 211 deforms along the length direction of the top cover assembly 2, thereby tilting relative to the thickness direction of the top cover assembly 2. When the dimension of the first protrusion 211 along the width direction of the top cover assembly 2 is smaller, a force can be applied to the first protrusion 211 along the width direction of the top cover assembly 2 during bending, so that the first protrusion 211 deforms along the width direction of the top cover assembly 2, thereby tilting relative to the thickness direction of the top cover assembly 2. Figure 5 In the embodiment shown, the first protrusion 211 has a smaller dimension along the length direction of the top cover assembly 2. Therefore, the first protrusion 211 is bent along the length direction of the top cover assembly 2 to be inclined relative to the thickness direction of the top cover assembly 2.

[0047] This design makes it easier to bend the first protrusion 211, so that the first protrusion 211 is tilted relative to the thickness direction of the top cover assembly 2, reducing the processing difficulty and better meeting the actual use requirements.

[0048] In one possible implementation, the first protrusion 211 is integrally formed on the aluminum sheet 21.

[0049] The unibody structure boasts superior structural strength and can be processed using methods such as stamping. Specifically, a raised dot process can be employed, where the metal sheet is partially sheared to create a unique structure with a recessed end and a raised dot on the other. This method offers advantages such as simple operation and high structural strength in the finished product, making it more suitable for practical applications.

[0050] like Figure 4 As shown, in one possible implementation, the top cover assembly 2 may further include a top patch 24. (As illustrated...) Figure 6 and Figure 7 As shown, along the thickness direction of the top cover assembly 2, the opposite sides of the aluminum sheet 21 are a first surface 213 and a second surface 214, respectively. The first surface 213 contacts the top patch 24, and the second surface 214 contacts the lower plastic 22. That is, the top patch 24 and the lower plastic 22 are located on opposite sides of the aluminum sheet 21. A first protrusion 211 is located on the second surface 214, and a second recess 212 is provided on the first surface 213. The second recess 212 is recessed towards the second surface 214. At least one plane perpendicular to the thickness direction of the top cover assembly 2 is defined as the first plane, and the projection of the second recess 212 onto the first plane is located within the projection range of the first protrusion 211 onto the first plane.

[0051] During the stamping process of the aluminum sheet 21, a second recess 212 is formed on one side of the aluminum sheet 21, and a first protrusion 211 is formed on the other side. The first protrusion 211 is used to cooperate with the lower plastic 22, and the second recess 212 can be used to cooperate with the top patch 24 to improve the fitting accuracy and stability of the aluminum sheet 21 and the top patch 24.

[0052] The second recess 212 can be used for dispensing adhesive or to cooperate with the protruding structure of the top patch 24 to position the top patch 24 and the aluminum sheet 21, thereby improving the relative positional accuracy of the two.

[0053] The top patch 24 can be used to protect the individual battery cells. The top patch 24 can also provide a certain degree of insulation and protect the top cover assembly 2.

[0054] like Figure 8 and Figure 9 As shown, in one possible implementation, the protrusion direction of the first protrusion 211 is parallel to the concave direction of the second recess 212, or there is an angle between the protrusion direction of the first protrusion 211 and the concave direction of the second recess 212.

[0055] When processing the aluminum sheet 21, a first protrusion 211 can be formed on one side of the aluminum sheet 21 by stamping or other means, and a second recess 212 can be formed on the other side. This allows the first protrusion 211 and the second recess 212 to be formed simultaneously, so that the aluminum sheet 21 can cooperate with the lower plastic 22 and the top patch 24.

[0056] After stamping, a bending punch can be used to stamp the first protrusion 211 so that the first protrusion 211 is inclined to improve the stability of the engagement between the first protrusion 211 and the first recess 221.

[0057] like Figure 10 and Figure 11 As shown, in one possible embodiment, along the thickness direction of the top cover assembly 2, the lower plastic 22 has a third surface 223 and a fourth surface 224 on opposite sides, respectively. The third surface 223 contacts the aluminum sheet 21, and the fourth surface 224 is located on the side of the lower plastic 22 away from the aluminum sheet 21. A first recess 221 is located on the third surface 223, and a second protrusion 222 is provided on the fourth surface 224, protruding away from the third surface 223. At least one surface perpendicular to the thickness direction of the top cover assembly 2 is defined as a second plane, and the projection of the first recess 221 onto the second plane is located within the projection range of the second protrusion 222 onto the second plane. The first plane is parallel to the second plane, and the first plane and the second plane may also be the same plane.

[0058] By providing a second protrusion 222 on the side of the lower plastic 22 away from the light aluminum sheet 21, the lower plastic 22 can be locally thickened to facilitate the provision of the first recess 221. The thickness of other parts of the lower plastic 22 without the first recess 221 can be reduced. The thickness of the parts without the first recess 221 can be less than the depth of the first recess 221, thereby reducing the overall thickness of the lower plastic 22 and the space occupied by the lower plastic 22. This allows the battery cell to have more space for the cell assembly 3 and electrolyte, thereby improving the capacity and performance of the battery cell and better meeting actual usage requirements.

[0059] like Figure 12 and Figure 13 As shown, in one possible implementation, the protrusion direction of the second protrusion 222 is parallel to the concave direction of the first recess 221, or there is an angle between the protrusion direction of the second protrusion 222 and the concave direction of the first recess 221.

[0060] The recessed direction of the first recess 221 can correspond to the protruding direction of the first protruding part 211, and the recessed direction of the first recess 221 can be parallel or approximately parallel to the protruding direction of the first protruding part 211. The second protruding part 222 protrudes along the thickness direction of the top cover assembly 2 to reduce the processing difficulty of the lower plastic 22, and at the same time facilitate the processing of the first recess 221 at the corresponding position.

[0061] like Figure 14 As shown, in one possible embodiment, the lower plastic 22 includes at least a first main body portion 225 and a second main body portion 226, which are connected along the length direction of the battery cell. The first main body portion 225 and the second main body portion 226 are respectively provided with a first protrusion 211 or a first recess 221. The length direction of the battery cell is generally parallel to the length direction of the top cover assembly 2 and the length direction of the lower plastic 22. The dimension of the lower plastic 22 along its length direction is larger than the dimension of the lower plastic 22 along its width direction.

[0062] The lower plastic component 22 can be a split structure, which improves its flexibility. By splicing, the structure of the lower plastic component 22 can be adjusted to accommodate different battery cell models. During processing, the mold manufacturing difficulty is relatively lower, resulting in better overall precision and better meeting actual production needs.

[0063] The first main body 225 and the second main body 226 can be connected by snap-fit, plug-in, adhesive or other means.

[0064] In one possible implementation, the inclination direction of the first protrusion 211 located in the first main body portion 225 is opposite to the inclination direction of the first protrusion 211 located in the second main body portion 226, or the inclination direction of the first recess 221 located in the first main body portion 225 is opposite to the inclination direction of the first recess 221 located in the second main body portion 226.

[0065] This design helps improve the stability of the fit between the lower plastic 22 and the aluminum sheet 21, making it more suitable for actual use.

[0066] Typically, the connection between the lower plastic sheet 22 and the aluminum sheet 21 relies on the electrode post 23. A portion of the lower plastic sheet 22 extends between the electrode post 23 and the aluminum sheet 21, and the compression between the electrode post 23 and the aluminum sheet 21 fixes the lower plastic sheet 22 and the aluminum sheet 21 relatively. Alternatively, the aluminum sheet 21 is cold-forged and pressed into a recessed area. Excess material accumulates at the recessed opening and protrudes relative to the lower surface of the aluminum sheet 21. The accumulated material area is then flattened, causing the material to backfill the recessed area and form an inverted shape. A corresponding boss is provided on the lower plastic sheet 22. By heating and pressurizing the bossed area of ​​the lower plastic sheet 22, the boss of the lower plastic sheet 22 melts and enters the inverted area. Alternatively, the connection can be achieved using double-sided adhesive.

[0067] This design results in poor relative positional accuracy between the lower plastic sheet 22 and the aluminum sheet 21, making them prone to warping and affecting the welding of the Mylar film, thus impacting the quality of the battery cells. Using double-sided adhesive for bonding carries the risk of electrolyte contamination, and during processing, the adhesive easily attracts dust and other foreign matter. Furthermore, the adhesive is prone to failure, reducing the lifespan of the battery cells. The countersunk hole method easily produces metal shavings, affecting the flatness of the area near the countersunk hole. Moreover, this method requires a hot-melt process and corresponding equipment, making the process complex and costly.

[0068] In the battery cell provided in this embodiment, no additional connection structure or connection process is required between the aluminum sheet 21 and the lower plastic 22. During assembly, the first protrusion 211 simply extends into the first recess 221. To improve the stability of the fit between the first protrusion 211 and the first recess 221, the first protrusion 211 can be tilted, with the first recess 221 corresponding to it. This design increases the contact area between the first protrusion 211 and the first recess 221, reducing the possibility of the aluminum sheet 21 and the lower plastic 22 separating. The positions of the first protrusion 211 and the first recess 221 are designed to minimize wall interference with other components within the battery cell, such as connecting pieces. Adjusting the tilt angle of the first protrusion 211 and the first recess 221 reduces the assembly difficulty of the aluminum sheet 21 and the lower plastic 22. The inclination direction of the first protrusion 211 can be different. For example, along the length of the top cover assembly 2, the first protrusions 211 at both ends of the aluminum sheet 21 are inclined in a direction that moves away from each other. During assembly, the first protrusion 211 on one side can be inserted into the corresponding first recess 221 firstly, and then the other side can be gently pushed and pressed to allow the first protrusion 211 on the other side to be inserted into the first recess 221. According to actual measurements, using the method provided in this embodiment, the warpage of the lower plastic 22 can be reduced from 3mm to 1mm. During processing, a stamping method can be used, which can reduce the residue of metal shavings and reduce the impact on the flatness of the aluminum sheet 21. The assembly method is simple and more in line with actual usage requirements.

[0069] The battery cell provided in this embodiment can improve the connection strength between the aluminum sheet 21 and the lower plastic 22, preventing displacement of internal components due to the expansion and contraction of the cell assembly 3 during charge and discharge cycles, which could affect the normal operation of the battery cell. It also prevents the aluminum sheet 21 from contacting other components, thereby reducing the possibility of insulation failure and short circuits.

[0070] Because the connection strength between the aluminum sheet 21 and the lower plastic sheet 22 is increased in the solution provided in this application embodiment, the battery cell provided in this application embodiment can better meet the needs of long-term energy storage systems. Long-term energy storage refers to energy storage technology where the battery cell can store electrical energy and continuously release it for more than 4 hours or 8 hours. The battery cell has the technical characteristics of large capacity, long lifespan, and high safety. Compared with short-term energy storage systems, long-term energy storage systems have high-capacity batteries, longer storage times, and can cope with the instability of energy functions, providing stable battery support. With the rapid development of renewable resources and the increasing instability of energy supply, long-term energy storage technology will become the main means of energy storage. Long-term energy storage systems can realize energy storage systems that span days, months, and even seasons of charge-discharge cycles, and can meet the long-term stable operation of the power system. Long-term energy storage requires stable operation over extended periods. Improving the connection stability between the aluminum sheet 21 and the lower plastic 22 of the battery cell makes the battery cell structure more stable, reducing the possibility of battery cell failure due to component loosening. This helps extend the battery cell's lifespan and improve its stability, better meeting the needs of long-term energy storage and reducing operation and maintenance costs. Improving the connection stability between the aluminum sheet 21 and the lower plastic 22 also reduces the possibility of system downtime due to leakage or short circuits caused by structural issues in the battery cell. Therefore, it improves overall performance, safety, and lifespan.

[0071] Based on the battery cells involved in the above embodiments, this application also provides a battery device that can be applied in a vehicle, such as a gasoline-powered vehicle, a natural gas-powered vehicle, an electric vehicle, or a hybrid vehicle, and can be used to supply power to the vehicle. The battery device includes the battery cells involved in any of the above embodiments. Since the battery cells have the above-mentioned technical effects, the battery device including the battery cells also has corresponding technical effects, which will not be elaborated here. The battery device includes one or more of the following: a battery module, a battery pack, and an energy storage battery.

[0072] This application also provides an electrical device, which may be a vehicle or the like. The electrical device may include the battery device involved in any of the above embodiments, and the battery device is used to provide electrical energy.

[0073] This application also provides an energy storage device, which includes the battery device involved in any of the above embodiments, and the battery device is used to provide electrical energy.

Claims

1. A battery cell, characterized in that, The battery cell includes a housing (1), a top cover assembly (2), and a cell assembly (3). The housing (1) has a receiving cavity, the cell assembly (3) is located in the receiving cavity, and the top cover assembly (2) is connected to the housing (1). The top cover assembly (2) includes an aluminum sheet (21), a lower plastic piece (22), and a terminal (23). The terminal (23) is disposed on the aluminum sheet (21) and electrically connected to the battery cell assembly (3). Along the thickness direction of the top cover assembly (2), the lower plastic piece (22) is located on one side of the aluminum sheet (21). Among them, the light aluminum sheet (21) and the lower plastic (22) are provided with at least one first protrusion (211) and the other is provided with at least one first recess (221), and at least a portion of the first protrusion (211) is located in the corresponding first recess (221).

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the top cover assembly (2), the size of the first protrusion (211) is a, and along the length or width direction of the top cover assembly (2), the size of the first protrusion (211) is b, and a≥b.

3. The battery cell according to claim 2, characterized in that, In the thickness direction of the top cover assembly (2), the size of the first protrusion (211) is 0.5 mm to 1.5 mm, and in the length or width direction of the top cover assembly (2), the size of the first protrusion (211) is 0.5 mm to 1 mm.

4. The battery cell according to claim 1, characterized in that, The first protrusion (211) has an angle with the thickness direction of the top cover assembly (2), and the angle c satisfies: 0° < c < 90°.

5. The battery cell according to claim 4, characterized in that, The light aluminum sheet (21) includes at least two first protrusions (211), and the tilt direction of at least one first protrusion (211) is opposite to the tilt direction of the other first protrusions (211).

6. The battery cell according to claim 4, characterized in that, The angle between the first protrusion (211) and the thickness direction of the top cover assembly (2) is c, and 10°≤c≤45°.

7. The battery cell according to any one of claims 1 to 6, characterized in that, The first protrusion (211) is integrally formed on the light aluminum sheet (21).

8. The battery cell according to any one of claims 1 to 6, characterized in that, The top cover assembly (2) includes a top patch (24). Along the thickness direction of the top cover assembly (2), the opposite sides of the light aluminum sheet (21) are a first surface (213) and a second surface (214), respectively. The first surface (213) contacts the top patch (24), and the second surface (214) contacts the lower plastic (22). The first protrusion (211) is disposed on the second surface (214), and the first surface (213) is provided with a second recess (212). The second recess (212) is recessed in a direction close to the second surface (214). At least one plane perpendicular to the thickness direction of the top cover assembly (2) is defined as a first plane. The projection of the second recess (212) on the first plane is located within the projection range of the first protrusion (211) on the first plane.

9. The battery cell according to claim 8, characterized in that, The protrusion direction of the first protrusion (211) is parallel to the concave direction of the second recess (212), or there is an angle between the protrusion direction of the first protrusion (211) and the concave direction of the second recess (212).

10. The battery cell according to any one of claims 1 to 6, characterized in that, Along the thickness direction of the top cover assembly (2), the opposite sides of the lower plastic (22) are a third surface (223) and a fourth surface (224), respectively. The third surface (223) is in contact with the light aluminum sheet (21), and the fourth surface (224) is located on the side of the lower plastic (22) away from the light aluminum sheet (21). The first recess (221) is located on the third surface (223), and the fourth surface (224) is provided with a second protrusion (222). The second protrusion (222) protrudes in a direction away from the third surface (223). At least one surface perpendicular to the thickness direction of the top cover assembly (2) is defined as a second plane. The projection of the first recess (221) on the second plane is located within the projection range of the second protrusion (222) on the second plane.

11. The battery cell according to claim 10, characterized in that, The protrusion direction of the second protrusion (222) is parallel to the concave direction of the first recess (221), or the protrusion direction of the second protrusion (222) has an angle with respect to the concave direction of the first recess (221).

12. The battery cell according to any one of claims 1 to 6, characterized in that, The lower plastic (22) includes at least a first main body (225) and a second main body (226). The first main body (225) and the second main body (226) are arranged and connected along the length direction of the battery cell. The first main body (225) and the second main body (226) are respectively provided with the first protrusion (211) or the first recess (221).

13. The battery cell according to claim 12, characterized in that, The inclination direction of the first protrusion (211) located in the first main body (225) is opposite to the inclination direction of the first protrusion (211) located in the second main body (226), or the inclination direction of the first recess (221) located in the first main body (225) is opposite to the inclination direction of the first recess (221) located in the second main body (226).

14. A battery device, characterized in that, The battery device includes the battery cell according to any one of claims 1 to 13, and the battery device includes one or more of the following: battery module, battery pack, and energy storage battery.

15. An electrical appliance, characterized in that, The electrical device includes the battery device of claim 14, the battery device being used to provide electrical energy.

16. An energy storage device, characterized in that, The energy storage device includes the battery device of claim 14, the battery device being used to provide electrical energy.

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