Energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device and electric equipment, the energy storage device comprises a shell and an end cover, the shell comprises an end face, an opening is formed in the end face, the end cover comprises a covering part and an embedding part arranged on the covering part, the embedding part comprises a side face opposite to the inner wall face of the shell, the covering part covers the end face and covers the opening, and the end face is provided with a plurality of side faces opposite to the inner wall face of the shell. And the embedding part is embedded in the shell. Thus, the covering part covers the end face and covers the opening, the embedding part is embedded in the shell, a step structure is formed between the covering part and the embedding part, the step structure can assist the end cover to be installed on the shell in an aligned mode, and foreign matter such as drawn wires generated by scraping of the end cover and the edge of the opening of the shell is reduced. Therefore, the failure risk of short circuit and the like of the energy storage device is reduced, and the safety of the energy storage device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and more specifically, to an energy storage device and electrical equipment. Background Art

[0002] In related art, an energy storage device includes a housing, an end cap, and an electrode assembly. The electrode assembly is disposed within the housing, which has an opening that is covered by the end cap. During installation, the end cap and the housing become difficult to align when the end cap covers the opening. This can cause scraping between the end cap and the housing's opening edge, creating foreign matter such as wire drawing. These foreign matter can easily cause the energy storage device to short-circuit or fail, reducing its safety. Utility Model Content

[0003] The embodiment of the present utility model provides an energy storage device and an electrical equipment.

[0004] The energy storage device of the embodiment of the present application includes a shell and an end cover, the shell includes an end face, the end face is formed with an opening, the end cover includes a covering portion and an embedded portion arranged on the covering portion, the embedded portion includes a side surface opposite to the inner wall surface of the shell, the covering portion covers the end face and covers the opening, and the embedded portion is embedded in the shell.

[0005] In the energy storage device of the embodiment of the present application, the covering portion covers the end surface and covers the opening, and the embedded portion is embedded in the shell, so that a step structure is formed between the covering portion and the embedded portion. The step structure can assist in the alignment and installation of the end cover on the shell, thereby reducing foreign matter such as wire drawing caused by scraping between the end cover and the opening edge of the shell, thereby reducing the risk of failure such as short circuit in the energy storage device and improving the safety of the energy storage device.

[0006] In some embodiments, the shell is provided with a first positioning portion at the opening, and the side is provided with a second positioning portion, and the second positioning portion is cooperatively connected with the first positioning portion.

[0007] In this way, the first positioning portion on the shell and the second positioning portion on the end cover are matched and connected, which makes it easier to position and align the end cover with the shell during installation, further reducing foreign matter such as wire drawing caused by scraping between the end cover and the opening edge of the shell, thereby reducing the risk of failure such as short circuit in the energy storage device and improving the safety of the energy storage device.

[0008] In some embodiments, one of the first and second positioning portions includes a positioning groove, and the other includes a positioning protrusion, wherein the positioning protrusion is engaged with the positioning groove. Thus, the positioning protrusion and the positioning groove have simple structures, making the housing and the end cap easy to manufacture and form, and facilitating the installation of the end cap onto the housing.

[0009] In certain embodiments, the first positioning portion includes a positioning groove, the second positioning portion includes a positioning protrusion, the housing includes an inner wall surface connected to the end surface, and the positioning groove extends through the end surface and the inner wall surface. Thus, the positioning groove extends through the end surface and the inner wall surface, providing sufficient space for the positioning groove, which facilitates the processing and manufacturing of the positioning groove.

[0010] In some embodiments, the first and second positioning portions are both multiple in number, with the multiple first positioning portions spaced apart along the circumference of the housing, and the multiple second positioning portions spaced apart along the circumference of the end cap. In this manner, the multiple positioning grooves and multiple positioning protrusions can constrain the end cap in multiple positions, further facilitating the positioning and installation of the end cap on the housing.

[0011] In certain embodiments, the end cap includes a covering portion and an embedded portion disposed on the covering portion. The embedded portion includes a side surface opposing the inner wall surface of the housing. The covering portion covers the end surface, and the embedded portion is embedded within the housing. The side surface is provided with the positioning protrusion. Thus, the covering portion covers the end surface of the housing, allowing the end cap to effectively cover the opening. Furthermore, the side surface of the embedded portion is provided with a positioning protrusion, allowing the covering portion to fit closely with the end surface of the housing, thereby improving the sealing performance of the connection between the end cap and the housing.

[0012] In certain embodiments, the side surface includes a first surface and a second surface, the first surface connecting the covering portion and the second surface, the first surface being provided with the positioning protrusion, and the distance between the second surface and the inner wall surface increasing as the covering portion approaches the embedding portion. Thus, the distance between the second surface and the inner wall surface increases as the covering portion approaches the embedding portion, allowing the second surface to guide the end cap into the housing during installation, thereby reducing scratches between the end cap and the housing and thereby reducing the formation of wiredrawing.

[0013] In some embodiments, the second surface is provided with a convex hump, the height of which increases from the first surface toward the width of the second surface. This convex hump can reduce the contact area between the end cap and the housing during installation, thereby reducing the generation of foreign matter such as wire drawing. Furthermore, the height of the convex hump from the second surface increases from the first surface toward the width of the second surface, thus providing a guide for the end cap to be installed in the opening and improving assembly efficiency.

[0014] In some embodiments, the surface of the convex hull is a curved surface, so that the contact area between the convex hull and the housing can be reduced, thereby reducing the formation of foreign matter such as wire drawing.

[0015] In certain embodiments, the housing includes an inner wall surface connected to the end surface, and the edge connecting the end surface and the inner wall surface is passivated. This passivation of the edge connecting the end surface and the inner wall surface can reduce the contact pressure between the end cap and the housing, thereby reducing the formation of foreign matter such as wire drawing.

[0016] The electrical equipment in the embodiment of the present utility model includes the energy storage device described above.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments with reference to the following drawings, in which:

[0019] Figure 1 It is a three-dimensional schematic diagram of an energy storage device according to an embodiment of the present utility model;

[0020] Figure 2 It is an exploded schematic diagram of the energy storage device according to the embodiment of the present utility model;

[0021] Figure 3 It is a plan view of an energy storage device according to an embodiment of the present invention;

[0022] Figure 4 is a cross-sectional schematic diagram of an energy storage device according to an embodiment of the present utility model;

[0023] Figure 5 yes Figure 4 Schematic diagram of the enlarged portion C.

[0024] Figure 6 yes Figure 2 An enlarged schematic diagram of part A;

[0025] Figure 7 It is a three-dimensional schematic diagram of the end cover of the embodiment of the utility model;

[0026] Figure 8 yes Figure 7 An enlarged schematic diagram of part B;

[0027] Figure 9 It is a three-dimensional schematic diagram of an electrical device according to an embodiment of the present invention.

[0028] Description of reference numerals:

[0029] 100-energy storage device, 10-shell, 11-end face, 12-opening, 13-first positioning portion, 131-positioning groove, 14-inner wall, 20-end cover, 21-second positioning portion, 211-positioning protrusion, 22-covering portion, 23-embedded portion, 231-side, 2311-first surface, 2312-second surface, 24-convex bulge, 30-electrode assembly, 40-explosion-proof valve plate, 50-protective plate. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but a person of ordinary skill in the art may be aware of the application of other processes and / or the use of other materials.

[0033] See also Figure 1-Figure 5 The energy storage device 100 of the embodiment of the present application includes a shell 10 and an end cover 20. The shell 10 includes an end surface 11, and the end surface 11 is formed with an opening 12. The end cover 20 includes a covering portion 22 and an embedding portion 23 provided on the covering portion 22. The embedding portion 23 includes a side surface 231 opposite to the inner wall surface 14 of the shell 10. The covering portion 22 covers the end surface 11 and covers the opening 12. The embedding portion 23 is embedded in the shell 10.

[0034] In the energy storage device 100 of the embodiment of the present application, the covering portion 22 covers the end surface 11 and covers the opening 12, and the embedding portion 23 is embedded in the shell 10, so that a step structure is formed between the covering portion 22 and the embedding portion 23. The step structure can assist in the alignment and installation of the end cover 20 on the shell 10, thereby reducing the generation of foreign matter such as wire drawing due to scraping between the end cover 20 and the edge of the opening 12 of the shell 10, thereby reducing the risk of failure such as short circuit of the energy storage device 100 and improving the safety of the energy storage device 100.

[0035] Specifically, the covering portion 22 and the embedding portion 23 may both be disc-shaped, with the diameter of the embedding portion 23 being smaller than the diameter of the covering portion 22. The embedding portion 23 and the covering portion 22 may be an integral structure, thereby facilitating the processing and manufacturing of the end cap 20.

[0036] In order to improve the stability of the connection between the end cover 20 and the housing 10 , after the end cover 20 covers the opening 12 , the covering portion 22 may be welded and fixed to the housing 10 .

[0037] The energy storage device 100 may be a cylindrical energy storage device or the like. Figure 6 As shown, the energy storage device 100 may also include an electrode assembly 30, which may include a positive electrode sheet, a negative electrode sheet, and a separator. The energy storage device 100 primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector uncoated with the positive active material layer protrudes from the positive current collector coated with the positive active material layer, and the positive current collector uncoated with the positive active material layer serves as the positive electrode tab.

[0038] Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer. The negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the isolation membrane can be PP or PE, etc. In addition, the electrode assembly 30 can be a wound structure or a laminated structure, and the embodiments of the present application are not limited to this.

[0039] The shell 10 is an external part of the energy storage device 100. The shell 10 can be made of a relatively strong material such as aluminum alloy. The shell 10 can form the overall shape of the energy storage device 100. For example, when the shell 10 is cylindrical, the energy storage device 100 is also approximately cylindrical. The end face 11 of the shell 10 is the surface in the longitudinal direction of the shell 10. The width of the end face 11 of the shell 10 can be the same as the wall thickness of the shell 10. When the shell 10 is cylindrical, the opening 12 can be circular. The opening 12 allows components such as the electrode assembly 30 to be installed in the shell 10.

[0040] The end cap 20 is plate-shaped, or in other words, a plate-like component. The profile of the end cap 20 can be circular, square, or other shapes. It is understood that if the profile of the end cap 20 is circular, the energy storage device 100 can be a cylindrical energy storage device 100. The end cap 20 can be made of a material such as metal. For example, the material of the end cap 20 can be an aluminum alloy to improve the strength of the end cap 20.

[0041] See also Figure 2 、 Figure 6-Figure 8 In some embodiments, the housing 10 is provided with a first positioning portion 13 at the opening 12; the end cover 20 covers the opening 12, and the side surface 231 of the embedded portion 23 is provided with a second positioning portion 21, and the second positioning portion 21 is cooperatively connected with the first positioning portion 13.

[0042] In this way, the first positioning portion 13 on the shell 10 and the second positioning portion 21 on the end cover 20 are cooperatively connected, which makes it easier to position and align the end cover 20 with the shell 10 during installation, thereby reducing the generation of foreign matter such as wire drawing due to scraping between the end cover 20 and the edge of the opening 12 of the shell 10, thereby reducing the risk of failure such as short circuit of the energy storage device 100 and improving the safety of the energy storage device 100.

[0043] Specifically, the first positioning portion 13 on the housing 10 can be connected to the edge of the opening 12 or spaced apart from the opening 12. When the first positioning portion 13 is connected to the edge of the opening 12, the first positioning portion 13 is located in the space defined by the outer surface of the housing 10.

[0044] The second positioning portion 21 cooperates with the first positioning portion 13 to make it easier for the end cover 20 to be aligned with the housing 10 during the process of covering the opening 12 , thereby improving the installation efficiency of the end cover 20 and reducing scratches between the end cover 20 and the housing 10 .

[0045] See also Figure 2 、 Figure 5-Figure 8In some embodiments, the first positioning portion 13 includes a positioning groove 131, and the second positioning portion 21 includes a positioning protrusion 211, which is engaged with the positioning groove 131. As such, the positioning protrusion 211 and the positioning groove 131 have a simple structure, making it easy to manufacture and form the housing 10 and the end cover 20, and facilitating the installation of the end cover 20 onto the housing 10.

[0046] Specifically, the positioning groove 131 can be a circular groove, a square groove, etc., and the positioning protrusion 211 matches the shape of the positioning groove 131. For example, when the positioning groove 131 is a circular groove, the positioning protrusion 211 is a circular protrusion, so that the positioning protrusion 211 can be accurately installed in the positioning groove 131.

[0047] Of course, in some embodiments, the first positioning portion 13 may include a positioning protrusion, and the second positioning portion 21 may include a positioning groove. In other words, one of the first positioning portion 13 and the second positioning portion 21 includes a positioning protrusion, and the other includes a positioning groove 131, and the positioning protrusion 211 is embedded in the positioning groove 131, so that the end cover 20 can be installed on the housing 10 more quickly.

[0048] See also Figure 6 In some embodiments, the shell 10 includes an inner wall surface 14 connected to the end surface 11, and the positioning groove 131 passes through the end surface 11 and the inner wall surface 14. Specifically, in order to improve the energy density of the energy storage device 100, the thickness of the shell 10 is set to be as thin as possible, so that the setting space of the positioning groove 131 is small. The positioning groove 131 passes through the end surface 11 and the inner wall surface 14, so that there is enough space for the formation of the positioning groove 131, which is conducive to the processing and manufacturing of the positioning groove 131. In addition, the positioning groove 131 passes through the end surface 11 and the inner wall surface 14, so that the positioning groove 131 is located in the space on the outer surface of the shell 10, which can also improve the appearance of the energy storage device 100.

[0049] It should be noted that the longitudinal dimension of the positioning groove 131 is smaller than the longitudinal dimension of the housing 10 , and the depth of the positioning groove 131 from the inner wall surface 14 of the housing 10 to the outer surface of the housing 10 is smaller than the thickness of the housing 10 .

[0050] See also Figure 2 、 Figure 5-Figure 8In some embodiments, there are multiple first positioning portions 13 and multiple second positioning portions 21, with multiple first positioning portions 13 spaced apart along the circumference of the housing 10, and multiple second positioning portions 21 spaced apart along the circumference of the end cap 20. For example, there may be four second positioning portions 21, each spaced apart along the circumference of the housing 10. In this way, the first positioning portions 13 and the second positioning portions 21 can constrain the end cap 20 in multiple positions, making it easier to position and install the end cap 20 on the housing 10. It should be noted that the number of positioning grooves 131 can be greater than or equal to the number of positioning protrusions 211.

[0051] See also Figure 4-Figure 5 and Figure 8 In some embodiments, the side surface 231 includes a first surface 2311 and a second surface 2312, the first surface 2311 connects the covering portion 22 and the second surface 2312, the first surface 2311 is provided with a second positioning portion 21, and the distance between the second surface 2312 and the inner wall surface 14 of the shell 10 increases along the direction from the covering portion 22 toward the embedded portion 23.

[0052] In this way, along the direction of the covering portion 22 toward the embedded portion 23, the distance between the second surface 2312 and the inner wall surface 14 of the shell 10 increases, so that the second surface 2312 can guide the end cover 20 into the shell 10 during the installation process of the end cover 20, thereby reducing the scratches between the end cover 20 and the shell 10, and thereby reducing the formation of wiredrawing.

[0053] Specifically, the first surface 2311 is an annular surface that faces the inner wall 14 of the housing 10. The first surface 2311 and the inner wall 14 of the housing 10 can be arranged parallel to each other. The distance between the second surface 2312 and the inner wall 14 of the housing 10 increases as the covering portion 22 moves toward the embedding portion 23. For example, the second surface 2312 extends obliquely from the first surface 2311 toward the inner center of the housing 10 and can be formed into a truncated cone shape.

[0054] See also Figure 4-Figure 5 and Figure 8 In some embodiments, a bump 24 is provided on the second surface 2312. The height of the bump 24 protruding from the second surface 2312 increases from the first surface 2311 toward the width of the second surface 2312. This reduces the contact area between the end cap 20 and the housing 10 during installation, thereby reducing the generation of foreign matter such as wire drawing. Furthermore, the height of the bump 24 protruding from the second surface 2312 increases from the first surface 2311 toward the width of the second surface 2312. This allows the bump 24 to serve as a guide, thereby guiding the end cap 20 during installation in the opening 12 and improving assembly efficiency.

[0055] It should be noted that the width of the second surface 2312 is the distance between two annular circumferences of the second surface 2312. The convex hull 24 may extend from the first surface 2311 along the width direction of the second surface 2312 to the other edge of the second surface 2312.

[0056] There are multiple convex bumps 24 , which are arranged along the circumference of the end cover 20 , so that during the installation of the end cover 20 , the multiple convex bumps 24 can guide various positions of the end cover 20 .

[0057] See also Figure 7 and Figure 8 In some embodiments, the surface of the convex hull 24 is a curved surface. It is understood that the contact between a curved surface and another entity is point contact or line contact. The surface of the convex hull 24 is a curved surface, which can reduce the contact area between the convex hull 24 and the housing 10, thereby reducing the formation of foreign matter such as wire drawing.

[0058] Please refer again Figure 6 In some embodiments, the housing 10 includes an inner wall surface 14 connected to the end surface 11, and the connecting edge between the end surface 11 and the inner wall surface 14 is passivated. For example, the connecting edge between the end surface 11 and the inner wall surface 14 is formed with a chamfer or a rounded corner. When the end cap 20 is inserted into the housing 10, the edge between the end surface 11 and the inner surface may contact the inserting portion 23 of the end cap 20. In this way, the passivated connecting edge between the end surface 11 and the inner wall surface 14 can reduce the pressure at which the end cap 20 contacts the housing 10, thereby reducing the formation of foreign matter such as wire drawing.

[0059] See also Figure 2 and Figure 4 In some embodiments, the energy storage device 100 may further include an explosion-proof valve plate 40 and a protective plate 50. The explosion-proof valve plate 40 is disposed on the end cap 20, and the protective plate 50 covers the explosion-proof valve plate 40. The explosion-proof valve plate 40 can be used to relieve pressure in the energy storage device 100, thereby improving the safety of the energy storage device 100.

[0060] See also Figure 9 The electrical device 400 of the present embodiment includes the above energy storage device 100. Thus, the energy storage device 100 can supply power to the electrical device 400. The electrical device 400 includes, but is not limited to, a vehicle. The energy storage device 100 includes, but is not limited to, a battery cell, a battery module, or a battery pack.

[0061] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of the embodiments of the present invention, "plurality" means two or more, unless otherwise specifically specified.

[0062] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative descriptions 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 any one or more embodiments or examples.

[0063] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present invention. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An energy storage device, characterized in that: include: a housing, the housing including an end surface, the end surface being formed with an opening; and The end cover includes a covering portion and an embedding portion arranged on the covering portion, the embedding portion includes a side surface opposite to the inner wall surface of the shell, the covering portion covers the end surface and covers the opening, and the embedding portion is embedded in the shell.

2. The energy storage device according to claim 1, characterized in that The shell is provided with a first positioning portion at the opening, and a second positioning portion is provided on the side surface. The second positioning portion is matched and connected with the first positioning portion.

3. The energy storage device according to claim 2, characterized in that One of the first positioning portion and the second positioning portion includes a positioning groove, and the other includes a positioning protrusion, and the positioning protrusion is embedded in the positioning groove.

4. The energy storage device according to claim 3, characterized in that The first positioning portion includes a positioning groove, the second positioning portion includes a positioning protrusion, the housing includes an inner wall surface connected to the end surface, and the positioning groove passes through the end surface and the inner wall surface.

5. The energy storage device according to claim 2, characterized in that There are multiple first positioning portions and multiple second positioning portions. The multiple first positioning portions are arranged at intervals along the circumference of the shell, and the multiple second positioning portions are arranged at intervals along the circumference of the end cover.

6. The energy storage device according to claim 2, characterized in that The side surface includes a first surface and a second surface, the first surface connects the covering portion and the second surface, the first surface is provided with the second positioning portion, and the distance between the second surface and the inner wall surface increases along the direction from the covering portion toward the embedded portion.

7. The energy storage device according to claim 6, characterized in that A convex hull is provided on the second surface, and the height of the convex hull protruding from the second surface increases from the first surface to the width direction of the second surface.

8. The energy storage device according to claim 7, characterized in that The surface of the convex hull is a curved surface.

9. The energy storage device according to claim 1, characterized in that The shell includes an inner wall surface connected to the end surface, and the connecting edge between the end surface and the inner wall surface is passivated.

10. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to any one of claims 1 to 9.

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