Battery shell, energy storage device and electric equipment

Abstract

The utility model discloses a battery shell, an energy storage device and electric equipment, the battery shell comprises a bottom plate and a surrounding plate, the bottom plate comprises a bottom plate body and a boss, the bottom plate body comprises a first surface, a second surface and a side surface connecting the first surface and the second surface, and the first surface and the second surface are oppositely arranged in the thickness direction of the bottom plate body; the boss is arranged on the first surface in a protruding mode, and the edge of the boss and the edge of the bottom plate body are arranged at intervals. The surrounding plate surrounds the bottom plate along the side surface, the surrounding plate and the bottom plate are welded and fixed, a welding protrusion is formed at the welding position, the welding protrusion protrudes out of the first surface, the welding protrusion and the boss are arranged at an interval, the welding protrusion surrounds the boss, and the height of the portion, protruding out of the first surface, of the welding protrusion is smaller than or equal to the height of the portion, protruding out of the first surface, of the boss. The surrounding plate and the bottom plate jointly define a containing cavity, and the second surface faces the containing cavity. According to the technical scheme, the situation that the welding line protrusions between the bottom plate and the surrounding plate pierce the insulating film is avoided, the insulating performance of the insulating film is guaranteed, and the safety of the energy storage device is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery housing, an energy storage device, and electrical equipment. Background Art

[0002] With the development of energy storage technology, consumers have increasingly stringent requirements for the safety performance of energy storage devices, especially regarding the insulation of the battery casing. Since battery casings are mostly made of metal, the outer surface of the battery casing of energy storage devices is often wrapped with an insulating film to insulate the battery casing from the external environment and ensure the safety of the energy storage device during use.

[0003] In existing energy storage devices, the battery casing is mostly a one-piece structure, formed by deep-drawing an aluminum ingot using a mold. However, this deep-drawing process is not suitable for producing large battery casings. Utility Model Content

[0004] The present application provides a battery housing, an energy storage device, and electrical equipment, which can facilitate the production of an extra-large battery housing.

[0005] In a first aspect, the present application provides a battery housing, comprising a base plate and a surrounding plate, the base plate comprising a base plate body and a boss, the base plate body comprising a first surface, a second surface, and a side surface connecting the first surface and the second surface, the first surface and the second surface being disposed opposite each other along a thickness direction of the base plate body, the boss being protruding from the first surface, and an edge of the boss being spaced apart from an edge of the base plate body;

[0006] The enclosure surrounds the base plate along the side surface, the enclosure is fixed to the base plate by welding, and a welding protrusion is formed at the welding position, the welding protrusion protrudes from the first surface and is spaced apart from the boss, the welding protrusion surrounds the boss, and the height of the welding protrusion protruding from the first surface is less than or equal to the height of the boss protruding from the first surface, the enclosure and the base plate together form an accommodating cavity, and the second surface faces the accommodating cavity.

[0007] In one embodiment, the bottom plate further includes a reinforcing protrusion, which is protruding from the second surface and connected to the edge of the bottom plate body;

[0008] The reinforcing protrusion and the boss are completely staggered in the thickness direction of the bottom plate.

[0009] In one embodiment, the boss, the reinforcing protrusion and the base plate body are integrally formed by a stamping process.

[0010] In one embodiment, the boss includes a boss surface, the boss surface is away from the base body, the boss surface is parallel to the first surface of the base body, and the orientation of the boss surface is consistent with the orientation of the first surface.

[0011] In one embodiment, the length direction of the boss is the same as the length direction of the battery housing, and the ratio of the length of the boss to the length of the battery housing is greater than or equal to 0.8 and less than or equal to 0.99.

[0012] In one embodiment, the distance between the edge of the boss and the edge of the base body is greater than or equal to 2 mm and less than or equal to 3 mm.

[0013] In one embodiment, the height of the boss is greater than or equal to 0.2 mm and less than or equal to 0.5 mm, and the ratio of the height of the boss to the thickness of the base body is greater than or equal to 0.1 and less than or equal to 0.3.

[0014] In a second aspect, the present application provides an energy storage device. The energy storage device includes an end cap assembly, an electrode assembly, an insulating film, and a battery housing. The electrode assembly is accommodated in the accommodating cavity. The end cap assembly is mounted on one end of the electrode assembly and seals the battery housing. The insulating film is connected to the outer surface of the enclosure and the boss surface of the boss.

[0015] In one embodiment, the battery housing further includes an opening, wherein the opening is connected to the accommodating cavity, the enclosure includes a first end and a second end, the first end surrounds the opening, the bottom plate is mounted on the second end of the enclosure, and the side surface of the bottom plate is connected to the inner surface of the enclosure, and is opposite to and spaced from the opening.

[0016] In one embodiment, the height of the welding protrusion is smaller than the height of the boss, and the insulating film is spaced apart from the welding protrusion; or, the height of the welding protrusion is equal to the height of the boss, and the insulating film is connected to the welding protrusion.

[0017] In a third aspect, the present application provides an electric device, wherein the electric device includes the energy storage device, and the energy storage device is used to supply power to the electric device.

[0018] In related technologies, battery casings are mostly split structures. When welding the bottom plate and the enclosure, a weld bulge forms at the joint. During the energy storage device manufacturing process, if the weld bulge has large height fluctuations or a sharp point, it can easily lift or even pierce the blue film wrapped around the outer surface of the battery casing, causing the blue film insulation to fail and reducing the safety of the energy storage device.

[0019] In an embodiment of the present application, a boss is provided on the base plate. The height of the boss is greater than or equal to the height of the welding boss. When the height of the welding boss is equal to the height of the boss, the insulating film is not only connected to the outer surface of the enclosure and the boss surface of the boss, but also connected to the welding boss. The welding boss will not lift up and pierce the insulating film. When the height of the welding boss is less than the height of the boss, the insulating film is connected to the outer surface of the enclosure and the boss surface of the boss, and the insulating film and the welding boss are spaced apart. That is, the insulating film will not be lifted up and pierced by the welding boss. In addition, the insulating film is directly connected to the boss surface of the boss, avoiding the insulating film being spaced apart from the base plate due to the welding boss lifting the insulating film, thereby preventing the insulating film from being scratched during the transportation and assembly of the energy storage device. This not only ensures the insulation performance of the insulating film and improves the safety of the energy storage device, but also increases the yield rate of the battery shell during the insulating film affixing process, reducing waste in the production process of the energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained from these drawings without any creative work.

[0021] Figure 1 An application scenario diagram of the energy storage device provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of the energy storage device provided in an embodiment of the present application;

[0023] Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device shown;

[0024] Figure 4 for Figure 3 A schematic structural diagram of the battery housing of the energy storage device shown in FIG.

[0025] Figure 5 for Figure 4 Schematic diagram of the exploded structure of the battery housing shown;

[0026] Figure 6 for Figure 5 A schematic structural diagram of the bottom plate of the battery housing shown;

[0027] Figure 7 for Figure 1 A schematic cross-sectional view of a partial structure of the energy storage device shown.

[0028] The nouns corresponding to the various reference numerals in the figure are: energy storage device 1000, battery housing 100, bottom plate 10, bottom plate body 11, first surface 111, second surface 112, side surface 113, boss 12, boss surface 121, reinforcing protrusion 13, enclosure 20, inner surface 21, outer surface 22, lower end surface 23, upper end surface 24, welding protrusion 30, opening 101, accommodating cavity 102, insulating film 200, end cover assembly 300, electrode assembly 400, energy storage system 5000, first electric energy conversion device 4100, second electric energy conversion device 4200, first electrical equipment 3000, second electrical equipment 2000. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," and the like should be interpreted broadly. For example, they can be fixedly connected, removably connected, or integrated; they can be mechanically connected, electrically connected, or communicative; they can be directly connected or indirectly connected through an intermediate medium; they can be internally connected between two elements or interact with each other, unless otherwise specified or limited. Furthermore, the terms "same," "equal," and "parallel" used below are subject to certain tolerances.

[0031] It should be noted that the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature defined as "first," "second," etc. may explicitly or implicitly include at least one of such features.

[0032] Because the energy people need is highly temporal and spatially dependent, rationally utilizing energy and improving its efficiency requires a medium or device that can store one form of energy in the same form or convert it into another, allowing it to be released in a specific form based on future application needs. As we all know, to achieve the goal of carbon neutrality, the primary method for generating green electricity is to develop green energy sources such as photovoltaics and wind power to replace fossil fuels. Currently, green electricity generation generally relies on photovoltaics, wind power, and hydropower. However, wind and solar power are generally intermittent and volatile, leading to grid instability, insufficient power during peak hours, and excessive power during off-peak hours. Unstable voltage can also damage electricity. Therefore, insufficient electricity demand or insufficient grid capacity can lead to "wind and solar curtailment." Addressing these issues requires energy storage. That is, electrical energy is converted into other forms of energy through physical or chemical means and stored, and then the energy is converted into electrical energy and released when needed. Simply put, energy storage is like a large "power bank". When there is sufficient photovoltaic and wind energy, electrical energy is stored and the stored electricity is released when needed.

[0033] Taking electrochemical energy storage as an example, the present application provides an energy storage device 1000. A group of chemical batteries are provided in the energy storage device 1000, which mainly uses the chemical elements in the chemical batteries as energy storage media. The charging and discharging process is accompanied by chemical reactions or changes in the energy storage medium. Simply put, the electricity generated by wind and solar energy is stored in the chemical batteries. When the use of external electricity reaches a peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0034] Currently, energy storage (i.e., energy storage) has a wide range of application scenarios, including (wind and solar) power generation-side energy storage, grid-side energy storage, base station-side energy storage, and user-side energy storage. The corresponding types of energy storage devices 1000 include:

[0035] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0036] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios on the user side (banks, shopping malls, etc.) mainly operate in the “peak shaving and valley filling” mode.

[0037] Since electricity prices vary significantly between peak and valley periods depending on electricity demand, users with energy storage devices typically charge their energy storage cabinets / boxes during low electricity price periods to reduce costs. During peak electricity price periods, the energy in the energy storage devices is then discharged for use, saving on electricity costs.

[0038] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, small household energy storage boxes and other equipment containing the energy storage device 1000 can be understood as electrical equipment.

[0039] See also Figure 1 , Figure 1 This is a diagram of an application scenario of the energy storage device provided in an embodiment of the present application.

[0040] The energy storage device 1000 provided in the embodiment of the present application is applied to an energy storage system 5000, which includes a first electric energy conversion device 4100 (photovoltaic panel), a second electric energy conversion device 4200 (wind turbine), a first electric device 3000 (grid), a second electric device 2000 (base station) and an energy storage device 1000. The energy storage system 5000 also includes an energy storage cabinet, and the energy storage device 1000 is installed in the energy storage cabinet, which can be installed outdoors. Specifically, the first electric energy conversion device 4100 can convert solar energy into electric energy during periods of low electricity prices, and the energy storage device 1000 is used to store the electric energy and supply it to the first electric device 3000 or the second electric device 2000 during peak electricity consumption, or to supply power when the first electric device 3000 or the second electric device 2000 is powered off / out of power. The second power conversion device 4200 can convert wind energy into electrical energy. The energy storage device 1000 is used to store this electrical energy and supply it to the first power device 3000 or the second power device 2000 during peak power consumption, or to supply power when the first power device 3000 or the second power device 2000 is powered off / out of power. The electrical energy can be transmitted using high-voltage cables.

[0041] It should be noted that the first power-consuming device 3000, the second power-consuming device 2000 and other devices including the energy storage device 1000 can be understood as power-consuming devices. The energy storage device 1000 provides power to the power-consuming devices.

[0042] There may be multiple energy storage devices 1000, and multiple energy storage devices 1000 may be connected in series or in parallel. In this embodiment, "multiple" refers to two or more.

[0043] It can be understood that the energy storage device 1000 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. The actual application form of the energy storage device 1000 provided in the embodiment of the present application may be, but is not limited to, the listed products, and may also be other application forms. For example, the energy storage device 1000 may be a secondary battery such as a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. When the energy storage device 1000 is a single cell, it may be a cylindrical battery, a square battery, or a battery of other shapes. In this embodiment, the energy storage device 1000 is described using a square battery as an example. Among them, the square battery is a secondary battery.

[0044] See also Figure 2 and Figure 3 , Figure 2 A schematic diagram of the structure of the energy storage device provided in an embodiment of the present application is shown. Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device shown.

[0045] For ease of description, the width direction of the energy storage device 1000 is defined as the X-axis direction, the length direction as the Y-axis direction, and the height direction as the Z-axis direction.

[0046] The directional terms such as "upper", "top", "lower", "bottom", "left", and "right" mentioned in the description of the embodiments of the present application are based on the Figure 2 The description of the orientation shown does not constitute a limitation on the actual application scenario of the energy storage device 1000. Specifically, the positive direction toward the Z axis is the top of the energy storage device 1000, and the negative direction toward the Z axis is the bottom of the energy storage device 1000.

[0047] Combine Figure 2 and Figure 3The energy storage device 1000 includes a battery housing 100, an insulating film 200, an end cover assembly 300 and an electrode assembly 400. The battery housing 100 has an opening 101 and is provided with a accommodating cavity 102. The opening 101 and the accommodating cavity 102 are connected. The electrode assembly 400 is accommodated in the accommodating cavity 102. The end cover assembly 300 is installed at one end of the electrode assembly 400 and sealed at the opening 101 to isolate the internal environment of the energy storage device 1000 from the external environment. The end cover assembly 300 includes a pole (not marked in the figure). The pole and the electrode assembly 400 are connected and electrically conductive. The insulating film 200 is wrapped around the outer side of the battery housing 100 to insulate the battery housing 100 from the external environment and prevent the battery housing 100 from short-circuiting. The outer side refers to the surface other than the surface of the battery housing 100 on the side where the opening 101 is provided. In this embodiment, the length of the energy storage device 1000 is greater than or equal to 400 mm and less than or equal to 600 mm. The battery housing 100 is a shell structure made of aluminum and has a rectangular parallelepiped shape.

[0048] See also Figure 4 and Figure 5 As shown, Figure 4 for Figure 3 The schematic diagram of the structure of the battery housing of the energy storage device shown in another angle, Figure 5 for Figure 4 Schematic diagram of the exploded structure of the battery casing shown.

[0049] The battery housing 100 includes a base plate 10 and a surrounding plate 20. The surrounding plate 20 defines an opening 101. The base plate 10 is mounted on the end of the surrounding plate 20 that is away from the opening 101. That is, along the Z-axis, the base plate 10 is opposite and spaced from the opening 101. The surrounding plate 20 is disposed around the edge of the base plate 10 and is welded to the base plate 10. The base plate 10 and the surrounding plate 20 together define a receiving chamber 102.

[0050] The enclosure 20 includes an inner surface 21 and an outer surface 22. The inner surface 21 and the outer surface 22 are arranged opposite to each other along the thickness direction of the enclosure 20. The inner surface 21 faces the accommodating cavity 102. The outer surface 22 faces away from the accommodating cavity 102. The enclosure 20 also includes a lower end surface 23 and an upper end surface 24. The lower end surface 23 and the upper end surface 24 are arranged opposite to each other along the height direction of the enclosure 20. The lower end surface 23 and the upper end surface 24 are both connected to the inner surface 21 and the outer surface 22. It can be understood that the enclosure 20 includes a first end and a second end. The first end and the second end are respectively opposite ends in the height direction of the enclosure 20. The upper end surface 24 is located at the first end, and the lower end surface 23 is located at the second end. The first end encloses an opening 101. The second end is used for assembly with the base plate 10.

[0051] It should be noted that in the traditional battery casing stamping and forming process, the battery casing is mostly an integrated structure, and people use a mold to perform a deep drawing process on the aluminum ingot to form an integrated casing. However, when making an extra-large battery casing, this drawing process cannot produce a large battery casing. In the embodiment of the present application, the battery casing 100 is a split structure, that is, the bottom plate 10 and the enclosure 20 of the battery casing 100 are formed separately. Among them, the enclosure 20 is a long strip of aluminum material that is bent and welded, and the enclosure 20 and the bottom plate 10 are welded together to form the battery casing 100, thereby improving the problems existing in the above-mentioned traditional battery casing stamping and forming process, and facilitating the production of the battery casing 100 required for the extra-large energy storage device 1000.

[0052] The base plate 10 includes a base plate body 11, a boss 12 and a reinforcing protrusion 13. The boss 12 and the reinforcing protrusion 13 are both connected to the base plate body 11 and are respectively located on opposite sides of the thickness direction of the base plate body 11. The boss 12 is located in the middle of the base plate body 11, and the edge of the boss 12 is spaced apart from the edge of the base plate body 11, and the distance from the edge of the boss 12 to the edge of the base plate body 11 is greater than or equal to 2 mm and less than or equal to 3 mm. The reinforcing protrusion 13 is located at the edge of the base plate body 11, and the reinforcing protrusion 13 is connected to the edge of the base plate body 11. In this embodiment, the boss 12, the reinforcing protrusion 13 and the base plate body 11 are formed by stamping, which not only reduces the processing steps of the base plate 10, making the production of the base plate 10 faster, but also reduces the production cost of the base plate 10.

[0053] The base plate body 11 includes a first surface 111, a second surface 112, and a side surface 113. The first surface 111 and the second surface 112 are disposed opposite to each other along the thickness direction of the base plate 10. The side surface 113 is connected to the first surface 111 and the second surface 112.

[0054] The boss 12 protrudes from the first surface 111 of the base body 11. The boss 12 includes a boss surface 121. The boss surface 121 is away from the base body 11. The boss surface 121 is parallel to the first surface 111, and the direction of the boss surface 121 is consistent with the direction of the first surface 111. In this embodiment, the length of the boss 12 extends in the same direction as the length of the base body 11. The width of the boss 12 extends in the same direction as the width of the base body 11. There is one boss 12. The boss 12 is generally a rectangular protrusion. The shape of the boss surface 121 is generally rectangular. The distance between the edge of the boss surface 121 of the boss 12 and the side surface 113 of the base body 11 is greater than or equal to 2 mm and less than or equal to 3 mm. Along the Z-axis, the straight-line distance between the boss surface 121 and the first surface 111 (i.e., the height of the boss 12 protruding from the first surface 111) is greater than 0.2 mm and less than or equal to 0.5 mm. That is, the height H2 of the boss 12 is greater than 0.2 mm and less than or equal to 0.5 mm.

[0055] In some possible embodiments, there may be multiple bosses 12 to increase the structural strength of the base plate 10. The multiple bosses 12 are all located in the middle of the base plate body 11, and the multiple bosses 12 are spaced apart along the Y-axis direction.

[0056] Combined Figure 6 , Figure 6 for Figure 5 The structure of the bottom plate of the battery housing is shown in FIG. A reinforcing protrusion 13 is provided protruding from the second surface 112 of the bottom plate body 11. The reinforcing protrusion 13 is used to increase the thickness of the bottom plate body 11, thereby enhancing the structural strength of the bottom plate 10. In this embodiment, there is only one reinforcing protrusion 13. The reinforcing protrusion 13 is provided around the edge of the second surface 112, and the surface of the reinforcing protrusion 13 is connected to the side surface 113. The reinforcing protrusion 13 is generally annular.

[0057] In some possible embodiments, there may be multiple reinforcing protrusions 13 , and the multiple reinforcing protrusions 13 are disposed around the edge of the second surface 112 .

[0058] In the thickness direction of the base plate 10, the reinforcing protrusion 13 and the boss 12 are completely staggered, that is, the orthographic projection of the boss 12 on the base plate body 11 and the orthographic projection of the reinforcing protrusion 13 on the base plate body 11 are completely staggered, and the boundary of the orthographic projection of the boss 12 on the base plate body 11 is connected to the boundary of the orthographic projection of the reinforcing protrusion 13 on the base plate body 11. In other embodiments, in the thickness direction of the base plate 10, the boundary of the orthographic projection of the boss 12 on the base plate body 11 and the boundary of the orthographic projection of the reinforcing protrusion 13 on the base plate body 11 can also be opposite.

[0059] It should be noted that in this embodiment, the boss 12 and the base plate body 11 are integrally formed via a simple stamping process. Furthermore, the distance between the edge of the boss 12 and the edge of the base plate body 11 is greater than or equal to 2 mm and less than or equal to 3 mm, which does not affect the mass stamping process for the base plate 10 of the battery housing 100. Furthermore, the boss surface 121 of the boss 12 forms a stepped structure with the first surface 111 of the base plate body 11, leaving a sufficient area at the edge of the base plate body 11 for laser welding of the base plate 10 and the enclosure 20.

[0060] See also Figure 7 , Figure 7 for Figure 1 The schematic cross-sectional view of a partial structure of the energy storage device shown is shown in FIG. Figure 7 The cross-sectional structure of the battery casing and insulating film is shown in FIG.

[0061] In this embodiment, the base plate 10 is mounted on the second end of the enclosure 20, and the enclosure 20 surrounds the base plate 10 along the side surface 113 of the base plate 10. The side surface 113 of the base plate 10 is connected to the inner surface 21 of the enclosure 20. The first surface 111 of the base plate body 11 faces away from the accommodating cavity 102 and is flush with the lower end surface 23 of the enclosure 20. The boss 12 faces away from the accommodating cavity 102. The second surface 112 of the base plate body 11 faces toward the accommodating cavity 102. The reinforcing protrusion 13 extends inwardly of the accommodating cavity 102. The reinforcing protrusion 13 is located near the connection between the base plate 10 and the enclosure 20.

[0062] The base plate 10 and the enclosure 20 are fixed by welding to form the battery housing 100. The first surface 111 of the base plate body 11, the boss surface 121 of the boss 12, and the outer surface 22 of the enclosure 20 together constitute the outer side surface of the battery housing 100. Specifically, welding is performed at the connection between the base plate 10 and the enclosure 20 to fix the base plate 10 and the enclosure 20, and after welding, a welding protrusion 30 is formed at the welding position. The welding protrusion 30 protrudes from the first surface 111. The welding protrusion 30 surrounds the boss 12 and is spaced apart from the boss 12. The welding protrusion 30 is formed on the edge of the first surface 111 of the base plate body 11 and the lower end surface 23 of the enclosure 20. It can be understood that the welding protrusion 30 is the weld protrusion generated when the base plate 10 and the enclosure 20 are welded. The welding protrusion 30 is an annular protrusion surrounding the bottom edge of the battery housing 100. The reinforcing protrusion 13 and the welding protrusion 30 are adjacent to each other in the thickness direction of the base plate 10, or the reinforcing protrusion 13 and the welding protrusion 30 have a certain overlapping portion in the thickness direction of the base plate 10. When the base plate 10 and the enclosure 20 are welded, the reinforcing protrusion 13 increases the thickness of the edge of the base plate body 11, reduces the stress at the connection between the base plate body 11 and the enclosure 20, and further enhances the strength of the base plate 10. At the same time, the reinforcing protrusion 13 and the base plate body 11 are integrally formed through a stamping process, which makes the processing of the base plate 10 faster and reduces costs.

[0063] It should be noted that the ratio of the length of the boss 12 to the length of the battery casing 100 is greater than or equal to 0.8 and less than or equal to 0.99, and the ratio of the height H2 of the boss 12 to the thickness D of the base plate body 11 (that is, the straight-line distance between the first surface 111 and the second surface 112) is greater than or equal to 0.1 and less than or equal to 0.3. The above-mentioned ratios take into account the specifications of the material used to make the stamping die of the base plate 10 and the specifications of the base plate 10, which is beneficial to extend the life of the stamping die of the base plate 10 and improve the yield rate of the mass-produced battery casing 100. It can not only ensure the insulation effect of the insulating film 200, but also meet the feasibility and mass production yield of the stamping production of the base plate 10.

[0064] Furthermore, compared to the base plate of a battery housing in the prior art, the base plate 10 in this embodiment is provided with a boss 12 and a reinforcing protrusion 13, while its overall dimensions do not need to be changed. That is, stamping the boss 12 and reinforcing protrusion 13 on the base plate 10 does not affect the assembly and welding of the base plate 10 and the enclosure 20. When the base plate 10 and the enclosure 20 are welded, the weld area between the base plate 10 and the enclosure 20 remains unchanged, thus not affecting the assembly of the internal structural components of the energy storage device 1000.

[0065] The insulating film 200 wraps the outer side surface of the battery case 100 .

[0066] It should be noted that during the manufacturing process of the energy storage device 1000, if the height fluctuation of the welding protrusion 30 is large or there is a sharp point, the welding protrusion 30 can easily lift up or even pierce the insulating film 200 wrapped around the outside of the battery housing 100, causing the insulation of the insulating film 200 to fail, thereby reducing the safety of the energy storage device 1000. In this embodiment, the height H1 of the welding protrusion 30 (that is, the maximum distance that the welding protrusion 30 protrudes from the first surface 111 of the bottom plate body 11) is less than or equal to the height H2 of the boss 12. Specifically, when the height of the welding protrusion 30 is equal to the height of the boss 12, the insulating film 200 is not only connected to the outer surface 22 of the enclosure 20 and the boss surface 121 of the boss 12, but also connected to the welding protrusion 30. The welding protrusion 30 will not lift up and pierce the insulating film 200. When the height of the welding protrusion 30 is less than the height of the boss 12, the insulating film 200 is connected to the outer surface 22 of the enclosure 20 and the boss surface 121 of the boss 12, and the insulating film 200 and the welding protrusion 30 are spaced apart in the Z-axis direction. That is, the insulating film 200 will not be lifted up and pierced by the welding protrusion 30. In addition, the insulating film 200 is directly connected to the boss surface 121 of the boss 12, avoiding the insulating film 200 being spaced apart from the base plate 10 due to the welding protrusion 30 lifting the insulating film 200. This prevents the insulating film 200 from being scratched during the transportation and assembly of the energy storage device 1000. This not only ensures the insulation performance of the insulating film 200 and improves the safety of the energy storage device 1000, but also increases the yield of the battery housing 100 during the insulating film 200 affixing process, reducing waste in the production process of the energy storage device 1000.

[0067] The above are only some of the embodiments and implementations of this application. The scope of protection of this application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A battery casing, characterized in that: The battery housing comprises: A bottom plate and a surrounding plate, wherein the bottom plate includes a bottom plate body and a boss, the bottom plate body includes a first surface, a second surface, and a side surface connecting the first surface and the second surface, the first surface and the second surface are arranged opposite to each other along the thickness direction of the bottom plate body, the boss is protruded from the first surface, and the edge of the boss is spaced apart from the edge of the bottom plate body; The enclosure surrounds the base plate along the side surface, the enclosure is fixed to the base plate by welding, and a welding protrusion is formed at the welding position, the welding protrusion protrudes from the first surface and is spaced apart from the boss, the welding protrusion surrounds the boss, and the height of the welding protrusion protruding from the first surface is less than or equal to the height of the boss protruding from the first surface, the enclosure and the base plate together form a accommodating cavity, and the second surface faces the accommodating cavity.

2. The battery housing according to claim 1, wherein: The bottom plate further includes a reinforcing protrusion, which is protruding from the second surface and connected to the edge of the bottom plate body; The reinforcing protrusion and the boss are completely staggered in the thickness direction of the bottom plate.

3. The battery housing according to claim 2, wherein: The boss, the reinforcing protrusion and the bottom plate body are integrally formed through a stamping process.

4. The battery housing according to claim 1, wherein: The boss includes a boss surface, the boss surface is away from the base body, the boss surface is parallel to the first surface of the base body, and the direction of the boss surface is consistent with the direction of the first surface.

5. The battery housing according to claim 1, wherein: The length direction of the boss is the same as the length direction of the battery case, and the ratio of the length of the boss to the length of the battery case is greater than or equal to 0.8 and less than or equal to 0.

99.

6. The battery housing according to claim 1, wherein: The distance between the edge of the boss and the edge of the base body is greater than or equal to 2 mm and less than or equal to 3 mm.

7. The battery housing according to claim 1, wherein: The height of the boss is greater than or equal to 0.2 mm and less than or equal to 0.5 mm, and the ratio of the height of the boss to the thickness of the base plate body is greater than or equal to 0.1 and less than or equal to 0.

3.

8. An energy storage device, characterized in that: The energy storage device includes an end cover assembly, an electrode assembly, an insulating film and a battery housing as described in any one of claims 1 to 7, wherein the electrode assembly is accommodated in the accommodating cavity, the end cover assembly is installed at one end of the electrode assembly and seals the battery housing, and the insulating film is connected to the outer surface of the enclosure and the boss surface of the boss.

9. The energy storage device according to claim 8, characterized in that The battery housing also includes an opening, which is connected to the accommodating cavity. The enclosure includes a first end and a second end, the first end surrounds the opening, the bottom plate is mounted on the second end of the enclosure, and the side surface of the bottom plate is connected to the inner surface of the enclosure, and is opposite to and spaced from the opening.

10. The energy storage device according to claim 8, characterized in that: The height of the welding protrusion is smaller than the height of the boss, and the insulating film is spaced apart from the welding protrusion; Alternatively, the height of the welding protrusion is equal to the height of the boss, and the insulating film is connected to the welding protrusion.

11. An electrical device, characterized in that: The electrical equipment includes the energy storage device according to any one of claims 8 to 10, and the energy storage device is used to supply power to the electrical equipment.

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