Energy storage device, energy storage module and electric equipment

Abstract

The utility model provides an energy storage device, an energy storage module and electric equipment, the energy storage device comprises a shell assembly and a bottom patch, the shell assembly comprises a shell and an outer wrapping film, the shell comprises a bottom plate, a side shell and a welding part, the welding part is connected between the bottom plate and the side shell, and the outer surface of the welding part protrudes in the direction away from the outer surface of the bottom plate; the outer wrapping film wraps the outer side of the shell, the bottom patch is arranged on the shell assembly, and the outer surface of the bottom patch protrudes relative to the outer surface of the welding part. The energy storage device provided by the utility model can solve the problem of insulation failure of the outer coating film caused by the fact that the welding part pierces the outer coating film.

Description

Technical Field

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

[0002] Traditional energy storage devices use welding to create their outer shells, which often leave welds. These welds can cause problems when the outer film is subsequently coated. These welds can pierce the outer film, leading to insulation failure. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide an energy storage device, an energy storage module and an electrical device, which can solve the problem of insulation failure of the outer membrane caused by the welding part piercing the outer membrane.

[0004] An embodiment of the present application provides an energy storage device, which includes a shell assembly and a bottom patch. The shell assembly includes a shell and an outer membrane. The shell includes a bottom plate, a side shell and a welding portion. The welding portion is connected between the bottom plate and the side shell. The outer surface of the welding portion protrudes in a direction away from the outer surface of the bottom plate. The outer membrane is covered on the outer side of the shell. The bottom patch is arranged on the shell assembly, and the outer surface of the bottom patch protrudes relative to the outer surface of the welding portion.

[0005] The embodiment of the present application provides an energy storage device. By providing a bottom patch on the housing assembly, and providing the outer surface of the bottom patch to protrude relative to the outer surface of the welding portion, the outer surface of the bottom patch can contact the ground before the welding portion when the energy storage device is dragged. This prevents the welding portion from scratching the outer membrane due to friction caused by the energy storage device contacting the ground, thereby avoiding the problem of the welding portion piercing the outer membrane due to dragging the energy storage device during the assembly process of the energy storage module, thereby causing the outer membrane insulation failure. This improves the safety of the energy storage device during use. In addition, the assembly of the housing in the energy storage device does not need to be changed, the assembly dimensions of the bottom plate in the housing do not need to be modified, the assembly between the bottom plate and the side shell is not affected, and the process of assembling the housing and the battery cell is not affected, and mass production feasibility is high.

[0006] In one possible embodiment, the projection of the bottom patch on the housing covers at least a portion of the outer surface of the welding portion, so that the bottom patch directly or indirectly covers the outer surface of the welding portion, and the outer surface of the bottom patch protrudes relative to the outer surface of the welding portion, thereby solving the problem of the welding portion piercing the outer film due to dragging the energy storage device during the assembly process of the energy storage device to form an energy storage module, thereby causing the outer film insulation failure, thereby improving the safety of the energy storage device during use.

[0007] In one possible embodiment, the outer film includes a bottom film portion that covers the outer surface of the base plate and the outer surface of the welding portion. The bottom patch is disposed on the outer surface of the bottom film portion facing away from the base plate, so that the bottom patch indirectly covers the outer surface of the welding portion. In this case, the outer surface of the bottom patch protrudes relative to the outer surface of the welding portion. During the assembly of the drag energy storage device to form the energy storage module, the energy storage device contacts the ground through the bottom patch, preventing the outer film covering the welding portion from scratching the ground. This also prevents the welding portion from piercing the outer film and causing insulation failure of the outer film, thereby improving the safety of the energy storage device during use.

[0008] In one possible embodiment, the bottom patch is provided with an opening, which penetrates the bottom patch along the thickness direction of the bottom patch, and the projection of the opening on the outer shell is spaced apart from the welding portion. This not only reduces the scratching of the welding portion on the outer film, but also allows the opening to expose the portion of the outer film covering the bottom plate, thereby avoiding affecting the heat dissipation effect of the energy storage device.

[0009] In one possible embodiment, the bottom patch is provided on the outer surface of the housing and covers at least part of the outer surface of the welding portion. The outer film also covers the outer surface of the bottom patch facing away from the housing, so that the bottom patch directly covers the outer surface of the welding portion, thereby realizing the use of the bottom patch to shield the welding portion. At this time, the outer surface of the bottom patch protrudes relative to the outer surface of the welding portion. After being covered with the outer film, the bottom patch can prevent the welding portion from directly contacting the outer film, thereby avoiding friction between the welding portion and the outer film during the assembly of the drag energy storage device to form an energy storage module, thereby avoiding the problem of the welding portion piercing the outer film and causing the insulation failure of the outer film. In addition, by arranging the bottom patch on the outer surface of the housing, the installation of the bottom patch can also be completed at the supplier end of the housing, reducing the process at the manufacturing end of the energy storage device.

[0010] In one possible embodiment, the bottom patch is arranged around the bottom plate, and the bottom patch is provided with an opening. The opening passes through the bottom patch along the thickness direction of the bottom patch and exposes at least a portion of the bottom plate. This not only reduces the scratching of the outer film by the welding part, but also uses the opening to expose at least a portion of the bottom plate in the shell, thereby avoiding affecting the heat dissipation effect of the energy storage device.

[0011] In one possible embodiment, the outer envelope includes a bottom membrane portion, which covers the outer surface of the bottom plate and the outer surface of the welding portion. The bottom patch is provided on the outer surface of the bottom membrane portion, and the outer surface of the bottom patch protrudes relative to the outer surface of the portion of the bottom membrane portion covering the welding portion, so that during the process of assembling the towed energy storage device to form an energy storage module, the bottom patch can prevent the portion of the bottom membrane portion of the outer envelope covering the welding portion from contacting the ground, thereby avoiding contact and friction between the portion of the bottom membrane portion covering the welding portion and the ground, and further avoiding the problem of the welding portion piercing the outer envelope and causing insulation failure of the outer envelope, thereby improving the safety of the energy storage device during use.

[0012] In one possible embodiment, there are multiple bottom patches, and the multiple bottom patches are all arranged on the outer surface of the bottom film portion facing away from the bottom plate, and are spaced apart along the extension direction of the bottom film portion. Alternatively, the extension direction of each bottom patch is the same as the extension direction of the bottom film portion, and the multiple bottom patches are spaced apart along the width direction of the bottom film portion. This not only reduces the scratching of the outer film by the welding portion, but also the gaps between the multiple bottom patches can avoid affecting the heat dissipation effect of the energy storage device.

[0013] In one possible embodiment, the bottom patch is made of a thermally conductive material, and the thermal conductivity of the bottom patch is close to the thermal conductivity of the thermal conductive adhesive used to assemble the energy storage module, so as to ensure that the thermal conductivity of the bottom patch fully meets the heat dissipation requirements of the energy storage module, which has a better positive effect on the performance of the energy storage device.

[0014] An embodiment of the present application further provides an energy storage module, comprising a housing and the energy storage device as described above, wherein the energy storage device is installed in the housing.

[0015] An embodiment of the present application also provides an electrical device, which has an energy storage device as described above, and the energy storage device is used to supply power to the electrical device, or the electrical device has an energy storage module as described above, and the energy storage module is used to supply power to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0017] Figure 1 An application scenario diagram of the energy storage device provided in an embodiment of the present application;

[0018] Figure 2 A schematic structural diagram of an energy storage device provided in an embodiment of the present application;

[0019] Figure 3 for Figure 2 A schematic diagram of the exploded structure of the energy storage device shown;

[0020] Figure 4 for Figure 3 A schematic structural diagram of the housing of the energy storage device shown in another perspective;

[0021] Figure 5 for Figure 4 A schematic diagram of the structure of the housing when the side shell and the bottom plate are assembled;

[0022] Figure 6 for Figure 5 A schematic diagram of the unfolded structure of the side panels that form the side shell in the assembly structure shown;

[0023] Figure 7 for Figure 4 A schematic diagram of the cross-sectional structure of portion A of the shell after being coated with an outer membrane;

[0024] Figure 8 A schematic structural diagram of the energy storage device provided in the first embodiment of the present application;

[0025] Figure 9 for Figure 8 A schematic diagram of the exploded structure of the energy storage device shown;

[0026] Figure 10 for Figure 8 A schematic cross-sectional structure diagram of part B of the energy storage device shown;

[0027] Figure 11 This is a schematic structural diagram of an energy storage device according to a second embodiment of the present application;

[0028] Figure 12 for Figure 11 A schematic diagram of the structure of the energy storage device shown in FIG. 1 with the outer membrane removed;

[0029] Figure 13 for Figure 11 Schematic diagram of the cross-sectional structure of part C;

[0030] Figure 14 This is a schematic structural diagram of an energy storage device according to a third embodiment of the present application;

[0031] Figure 15 for Figure 14 A schematic diagram of the exploded structure of the energy storage device shown;

[0032] Figure 16 for Figure 14 A schematic cross-sectional structure diagram of portion D of the energy storage device shown;

[0033] Figure 17 This is a schematic structural diagram of an energy storage device according to a fourth embodiment of the present application;

[0034] Figure 18 for Figure 17 A schematic diagram of the exploded structure of the energy storage device shown;

[0035] Figure 19 for Figure 17 Schematic diagram of the cross-sectional structure of part E in the energy storage device shown.

[0036] Figure numerals: energy storage system 5000, electric energy conversion device 4500, wind energy conversion device 4000, second electrical equipment 3000, energy storage device 1000, shell assembly 100, battery cell 200, shell 110, side shell 10, accommodating cavity 11, first edge 13, second edge 15, third edge 17, fourth edge 19, bottom plate 30, top cover 50, welding part 70, outer film 130, side film part 131, bottom film part 133, bottom patch part 61, covering film part 63, bottom patch 300, opening 310, first patch part 301, second patch part 303, first surface 330, second surface 350, first bottom patch 305, second bottom patch 307, middle bottom patch 309. DETAILED DESCRIPTION

[0037] 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.

[0038] Taking electrochemical energy storage as an example, this solution provides an energy storage device with a group of chemical batteries inside. The energy storage device 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 its peak, the stored electricity is released for use, or transferred to places where electricity is scarce for use.

[0039] 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 energy storage device types include:

[0040] (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;

[0041] (2) Small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side mainly operate in the "peak shaving and valley filling" mode. Since there is a large price difference in electricity prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage cabinets / boxes during the low electricity price period; during the peak electricity price period, they release the electricity in the energy storage equipment for use, thereby saving electricity costs.

[0042] It should be noted that the above-mentioned energy storage containers, small and medium-sized energy storage cabinets, household small energy storage boxes and other equipment containing energy storage devices can be understood as electrical equipment.

[0043] See also Figure 1 , Figure 1 This is a diagram of an application scenario of the energy storage device 1000 provided in an embodiment of the present application.

[0044] The energy storage device 1000 provided in the embodiment of the present application is applied to an energy storage system 5000, which includes an electric energy conversion device 4500 (photovoltaic panel), a wind energy conversion device 4000 (windmill), a first electric device (grid), a second electric device 3000 (base station) and an energy storage device 1000. The energy storage system 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 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 or the second electric device during peak electricity consumption, or to supply power when the first electric device or the second electric device is powered off / out of power. The second electric energy conversion device can convert wind energy into electric energy, and the energy storage device 1000 is used to store the electric energy and supply it to the first electric device or the second electric device during peak electricity consumption, or to supply power when the first electric device or the second electric device is powered off / out of power. Among them, the transmission of electric energy can be carried out using high-voltage cables.

[0045] It should be noted that the first electric device, the second electric device and other devices including the energy storage device 1000 can be understood as electric devices.

[0046] See also Figure 2 and Figure 3 , Figure 2 The schematic diagram of the structure of the energy storage device 1000 provided in the embodiment of the present application is as follows: Figure 3 for Figure 2 Schematic diagram of the exploded structure of the energy storage device 1000 is shown.

[0047] For the convenience of description, we define Figure 2 The length direction of the energy storage device 1000 is the X-axis direction, the width direction is the Y-axis direction, and the height direction is the Z-axis direction. The X-axis direction, the Y-axis direction, and the Z-axis direction are perpendicular to each other. The terms "top" and "bottom" mentioned in the embodiment of the present application when describing the energy storage device 1000 are based on the attached specification. Figure 2 The description of the orientation shown uses the positive direction of the Z axis as the “top” and the negative direction of the Z axis as the “bottom”, which does not constitute a limitation on the actual application scenario of the energy storage device 1000.

[0048] The present application also provides an energy storage module, including a box and an energy storage device 1000, wherein the energy storage device 1000 is installed in the box. There may be multiple energy storage devices 1000, and the multiple energy storage devices 1000 are all installed inside the box.

[0049] Each energy storage device 1000 includes a housing assembly 100 and a battery cell 200 . The housing assembly 100 includes a housing 110 and an outer film 130 . The battery cell 200 is mounted on the inner side of the housing 110 , and the outer film 130 is coated on the outer side of the housing 110 .

[0050] Specifically, the housing 110 includes a side housing 10, a bottom plate 30, and a top cover 50. The bottom plate 30 and the top cover 50 are mounted on opposite sides of the side housing 10 along the height direction.

[0051] See also Figure 4 、 Figure 5 and Figure 6 , Figure 4 for Figure 3 The schematic diagram of the structure of the housing 110 in the energy storage device 1000 is shown in another perspective. Figure 5 for Figure 4 The schematic diagram of the structure of the housing 110 when the side shell 10 and the bottom plate 30 are assembled is shown. Figure 6 for Figure 5 The schematic diagram of the unfolded structure of the side panels making up the side shell 10 in the assembled structure shown is shown.

[0052] The side shell 10 is provided with a receiving cavity 11, and the receiving cavity 11 is used to accommodate the battery cell 200. In this embodiment, the side shell 10 is formed integrally with the side plate. Figure 6 As shown, the side panel includes a first edge 13, a second edge 15, a third edge 17 and a fourth edge 19. The first edge 13 and the second edge 15 are arranged opposite to each other along the extension direction of the side panel, and the third edge 17 and the fourth edge 19 are arranged opposite to each other along the width direction of the side panel. The first edge 13 and the second edge 15 of the side panel are fixedly connected to form the side shell 10. Exemplarily, the side panel is an aluminum long plate, which is bent and welded to form a circular side shell 10. The aluminum long plate is bent to enclose a receiving cavity 11, and the first edge 13 and the second edge 15 are fixedly connected by welding. The third edge 17 and the fourth edge 19 are respectively bent to form two openings of the receiving cavity 11.

[0053] The bottom plate 30 is mounted on the side of the side shell 10 along the negative Z-axis direction and blocks the opening of the accommodating cavity 11 formed by the third edge 17. Exemplarily, the bottom plate 30 is an aluminum plate. The top cover 50 is mounted on the side of the side shell 10 along the positive Z-axis direction and blocks the opening of the accommodating cavity 11 formed by the fourth edge 19.

[0054] See also Figure 3 、 Figure 4and Figure 7 , Figure 7 for Figure 4 The cross-sectional structure diagram of portion A of the housing 110 after being covered with the outer membrane 130 is shown.

[0055] In the embodiment of the present application, the housing 110 further includes a welding portion 70 , which is connected between the side shell 10 and the bottom plate 30 , and an outer surface of the welding portion 70 protrudes relative to the outer surface of the bottom plate 30 in a direction away from the outer surface of the bottom plate 30 .

[0056] Specifically, the welding portion 70 is connected between the third edge 17 of the bottom plate 30 and the side shell 10 to realize the connection between the welding portion 70 and the side shell 10. In this embodiment, the outer surface of the welding portion 70 protrudes in the negative direction of the Z axis relative to the outer surface of the bottom plate 30, and the height of the outer surface of the welding portion 70 protruding relative to the outer surface of the bottom plate 30 is D. In the embodiment of the present application, the bottom plate 30 and the side shell 10 are welded into one body by vertical welding to form the welding portion 70, so as to assemble the shell into an integral body, and realize that the outer surface of the welding portion 70 protrudes in the direction away from the outer surface of the bottom plate 30. Among them, the welding portion 70 is arranged around the bottom plate 30. Exemplarily, in this embodiment, the welding portion 70 is arranged around the entire circumference of the bottom plate 30.

[0057] The outer film 130 is coated on the outer surface of the side shell 10, the outer surface of the bottom plate 30 and the outer surface of the welding portion 70, so that the outer film 130 is coated on the outer side of the outer shell 110. Exemplarily, the outer film 130 is an insulating blue film to improve the safety of the energy storage device 1000 during use. The outer film 130 includes a side film portion 131 and a bottom film portion 133. Among them, the side film portion 131 covers the outer surface of the side shell 10, and the bottom film portion 133 covers the outer surface of the bottom plate 30 and the outer surface of the welding portion 70, so that the outer film 130 is coated on the outer surface of the outer shell 110. Exemplarily, the outer film 130 can be integrally formed, and the bottom film portion 133 is connected to the side film portion 131. There can be multiple battery cells 200. Multiple battery cells 200 are installed in the accommodating cavity 11 of the side shell 10, so that the battery cells 200 are installed on the inner side of the outer shell 110.

[0058] When assembling the energy storage device 1000, the side shell 10 and the bottom plate 30 can first be welded together using vertical welding to form a single body. This creates a welded portion 70 that protrudes from the outer surface of the bottom plate 30. The battery cell 200 is then installed into the accommodating cavity 11 of the side shell 10. Finally, the top cover 50 is attached to the side shell 10 to form the outer shell 110. Finally, the outer shell 110 is covered with an outer film 130 to complete the assembly of the energy storage device 1000.

[0059] Compared with the traditional stamping process, the use of welding to weld the bottom plate 30 and the side shell 10 can improve and solve the problem of difficulty and variability in forming ultra-long stamping shells such as aluminum shells. Among them, after the bottom plate 30 is welded to the side shell 10, there is a higher welding part 70 on the weld of the bottom plate 30. After the outer surface of the outer shell 110 is covered with the outer film 130, the position where the outer film 130 covers the welding part 70 will be lifted by the welding part 70. In the process of assembling the towed energy storage device 1000 to form an energy storage module, especially when the convex fluctuation of the welding part 70 is too large or there is an abnormal convex position, the tip part of the welding part 70 can easily pierce the outer film 130, causing the part of the outer film 130 covering the welding part 70 to be scratched, thereby causing the insulation failure of the outer film 130. When side welding is used to weld the bottom plate 30 to the side shell 10, a side protrusion will be formed that protrudes in a direction away from the outer surface of the side shell 10. After being coated with the outer film 130, this side protrusion will also have the problem of piercing the outer film 130. In addition, because the total length of the energy storage module formed by assembling the energy storage device 1000 is fixed, the side protrusion will also affect the distance between the energy storage devices 1000 and the energy storage devices 1000, thereby affecting the assembly gap when the energy storage device 1000 forms the energy storage module. In addition, the side welding process also has the problem of high processing difficulty for the outer shell 110. Therefore, in the embodiment of the present application, the bottom plate 30 and the side shell 10 are welded by vertical welding to form a welding portion 70 that protrudes in a direction away from the outer surface of the bottom plate 30.

[0060] In order to solve the problem that the welding portion 70 easily causes the outer film 130 to be pierced, the embodiment of the present application adds a bottom patch 300 to the energy storage device 1000. The following is a detailed description of the configuration of the bottom patch 300.

[0061] See also Figure 8 、 Figure 9 and Figure 10 , Figure 8 This is a structural diagram of the energy storage device 1000 provided in the first embodiment of the present application. Figure 9 for Figure 8 The exploded structural diagram of the energy storage device 1000 is shown. Figure 10 for Figure 8 Schematic diagram of the cross-sectional structure of portion B of the energy storage device 1000 is shown.

[0062] The energy storage device 1000 further includes a bottom patch 300 . The bottom patch 300 is disposed on the housing assembly 100 , and an outer surface of the bottom patch 300 protrudes relative to an outer surface of the welding portion 70 .

[0063] In the first embodiment, the bottom patch 300 is arranged on the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30, and the projection of the bottom patch 300 on the shell 110 in the shell assembly 100 covers at least a portion of the outer surface of the welding portion 70, so that the outer surface of the bottom patch 300 protrudes relative to the outer surface of the welding portion 70.

[0064] Specifically, within the outer envelope 130 of the housing assembly 100, the bottom membrane portion 133 includes a bottom-attaching portion 61 and a covering portion 63. The bottom-attaching portion 61 covers the outer surface of the bottom plate 30, while the covering portion 63 surrounds the bottom-attaching portion 61 and covers the outer surface of the welding portion 70. The bottom patch 300 includes a first surface 330 and a second surface 350. The first surface 330 and the second surface 350 are disposed opposite each other along the thickness direction of the bottom patch 300, that is, along the Z-axis. The second surface 350 is the outer surface of the bottom patch 300.

[0065] In this embodiment, the first surface 330 of the bottom patch 300 is in contact with the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30, and the second surface 350 faces away from the outer surface of the bottom film portion 133, thereby enabling the bottom patch 300 to be installed on the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30. The bottom patch 300 covers at least a portion of the outer surface of the covering portion 63 of the bottom film portion 133 of the outer film 130 facing away from the welding portion 70, so that the projection of the bottom patch 300 on the housing 110 covers at least a portion of the outer surface of the welding portion 70. This causes the second surface 350 of the bottom patch 300, and thus the outer surface of the bottom patch 300, to protrude relative to the outer surface of the welding portion 70.

[0066] In this embodiment, the bottom patch 300 completely covers the outer surface of the covering portion 63 of the bottom film portion 133 facing away from the welding portion 70, so that the projection of the bottom patch 300 on the housing 110 completely covers the welding portion 70. Furthermore, in this embodiment, the bottom patch 300 typically also covers a portion of the bottom adhesive portion 61 of the bottom film portion 133. For example, in this embodiment, the thickness of the bottom patch 300 is 0.2 mm to 0.5 mm to ensure that the bottom patch 300 is thick enough and thus has good friction resistance.

[0067] The bottom patch 300 is provided with an opening 310, which passes through the bottom patch 300 along the thickness direction of the bottom patch 300, and the opening 310 is spaced apart from the welding portion 70 in the projection of the outer shell 110. In this embodiment, the opening 310 exposes at least part of the bottom patch portion 61 in the bottom film portion 133 of the outer film 130. In this embodiment, the bottom patch 300 includes two first patch portions 301 and two second patch portions 303. The two first patch portions 301 are spaced apart along the length direction of the bottom patch 300, and the two second patch portions 303 are spaced apart along the width direction of the bottom patch 300 and are respectively connected between the two first patch portions 301. The two first patch portions 301 and the two second patch portions 303 enclose and form the opening 310. Exemplarily, the width of the first patch portion 301 is 10 mm, and the width of the second patch portion 303 is 10 mm.

[0068] In this embodiment, the bottom patch 300 is integrally formed and bonded to the bottom film portion 133, covering at least a portion of the outer surface of the covering portion 63 of the bottom film portion 133 facing away from the welding portion 70. For example, in this embodiment, the bottom patch 300 is a hollow sealant, has a square shape, and is integrally formed. The bottom patch 300 can be adhered to the outer surface of the bottom film portion 133 by adhesive bonding. The design of the integral sealant allows for adhesion and removal from the outer surface of the outer film 130 by a peel-and-stick method, making the bottom patch 300 easy to bond and highly efficient to install.

[0069] In the energy storage device 1000 provided in the embodiment of the present application, a bottom patch 300 is provided on the housing assembly 100, and the outer surface of the bottom patch 300 is configured to protrude relative to the outer surface of the welding portion 70. This allows the outer surface of the bottom patch 300 to contact the ground before the welding portion 70 when the energy storage device 1000 is dragged. This prevents the welding portion 70 from scratching the outer film 130 due to friction caused by the energy storage device 1000 contacting the ground. This also prevents the welding portion 70 from piercing the outer film 130 due to dragging the energy storage device 1000 during assembly to form an energy storage module, thereby preventing the insulation failure of the outer film 130 caused by the welding portion 70. This improves the safety of the energy storage device 1000 during use. In addition, the assembly of the housing 110 in the energy storage device 1000 does not need to be changed, the assembly dimensions of the bottom plate 30 in the housing 110 do not need to be modified, the assembly between the bottom plate 30 and the side shell 10 is not affected, and the assembly process of the housing 110 and the battery cell 200 is not affected, and mass production feasibility is high.

[0070] Specifically, the projection of the bottom patch 300 on the housing 110 can be arranged to cover at least a portion of the outer surface of the welding portion 70, so that the bottom patch 300 directly or indirectly covers the outer surface of the welding portion 70, and the outer surface of the bottom patch 300 protrudes relative to the outer surface of the welding portion 70. This solves the problem of the welding portion 70 piercing the outer film 130 due to dragging the energy storage device 1000 during the assembly process of the energy storage device 1000 to form an energy storage module, thereby causing the insulation failure of the outer film 130, thereby improving the safety of the energy storage device 1000 during use.

[0071] Specifically, in the first embodiment, the bottom patch 300 is positioned on the outer surface of the bottom film portion 133 of the outer film 130, facing away from the bottom plate 30. The projection of the bottom patch 300 on the outer shell 110 covers at least a portion of the outer surface of the welding portion 70, thereby achieving indirect coverage of the outer surface of the welding portion 70 by the bottom patch 300. In this case, the outer surface of the bottom patch 300 protrudes relative to the outer surface of the welding portion 70. During the assembly of the towed energy storage device 1000 to form the energy storage module, the energy storage device 1000 contacts the ground through the bottom patch 300, preventing the outer film 130 covering the welding portion 70 from scratching the ground. This prevents the welding portion 70 from piercing the outer film 130, which could lead to insulation failure of the outer film 130. This improves the safety of the energy storage device 1000 during use.

[0072] In addition, by providing a bottom patch 300 with an opening 310, and arranging the projection of the opening 310 on the housing 110 to be spaced apart from the welding portion 70, not only can the scratching of the welding portion 70 on the outer film 130 be reduced, but the opening 310 can also expose the portion of the outer film 130 covering the bottom plate 30, thereby avoiding affecting the heat dissipation effect of the energy storage device 1000.

[0073] See also Figure 11 、 Figure 12 and Figure 13 , Figure 11 This is a structural diagram of an energy storage device 1000 according to the second embodiment of the present application. Figure 12 for Figure 11 The schematic diagram of the structure of the energy storage device 1000 with the outer membrane 130 removed is shown. Figure 13 for Figure 11 Schematic diagram of the cross-sectional structure of part C.

[0074] The energy storage device 1000 of the second embodiment differs from the energy storage device 1000 of the first embodiment in that the bottom patch 300 in the energy storage device 1000 of the second embodiment is disposed on the outer surface of the housing 110 and covers at least a portion of the outer surface of the soldering portion 70 , so that the projection of the bottom patch 300 on the housing 110 covers at least a portion of the outer surface of the soldering portion 70 , and the outer surface of the bottom patch 300 protrudes relative to the outer surface of the soldering portion 70 .

[0075] Specifically, the first surface 330 of the bottom patch 300 is aligned with the outer surface of the soldering portion 70, and the second surface 350 faces away from the outer surface of the soldering portion 70, so that the bottom patch 300 is disposed on the outer surface of the housing 110 and directly covers the outer surface of the soldering portion 70. In this embodiment, the bottom patch 300 is disposed around the bottom plate 30, and the first surface 330 is also aligned with the outer surface of the bottom plate 30, so that the bottom patch 300 covers a portion of the outer surface of the bottom plate 30. In this embodiment, the bottom patch 300 is integrally formed and bonded to the outer surface of the housing 110, covering at least a portion of the outer surface of the soldering portion 70. The opening 310 of the bottom patch 300 exposes at least a portion of the bottom plate 30 within the housing 110. The bottom film portion 133 of the outer film 130 covers the outer surface of the bottom plate 30 and the outer surface of the bottom patch 300, so that the outer film 130 covers the outer sides of the housing 110 and the bottom patch 300. Illustratively, in this embodiment, the thickness of the bottom patch 300 is 0.2 mm to 0.5 mm.

[0076] In the energy storage device 1000 provided in the second embodiment, the bottom patch 300 is disposed on the outer surface of the housing 110 and covers at least a portion of the outer surface of the welding portion 70, so that the bottom patch 300 directly covers the outer surface of the welding portion 70, thereby utilizing the bottom patch 300 to shield the welding portion 70. In this case, the outer surface of the bottom patch 300 protrudes relative to the outer surface of the welding portion 70. After being coated with the outer film 130, the bottom patch 300 can prevent the welding portion 70 from directly contacting the outer film 130. This prevents friction between the welding portion 70 and the outer film 130 during assembly of the drag energy storage device 1000 to form an energy storage module, thereby preventing the welding portion 70 from piercing the outer film 130 and causing insulation failure of the outer film 130. Furthermore, compared to the solution of the first embodiment, disposing the bottom patch 300 on the outer surface of the housing 110 allows the bottom patch 300 to be installed at the supplier end of the housing 110, reducing the number of manufacturing steps required for the energy storage device 1000.

[0077] In addition, by providing the bottom patch 300 with the opening 310, not only can the scratching of the outer film 130 by the welding portion 70 be reduced, but also at least a portion of the bottom plate 30 in the shell 110 can be exposed by the opening 310, thereby avoiding affecting the heat dissipation effect of the energy storage device 1000.

[0078] See also Figure 14 、 Figure 15 and Figure 16 , Figure 14 Schematic diagram of the structure of the energy storage device 1000 according to the third embodiment of the present application. Figure 15 for Figure 14 The exploded structural diagram of the energy storage device 1000 is shown. Figure 16 for Figure 14 Schematic diagram of the cross-sectional structure of portion D of the energy storage device 1000 is shown.

[0079] The energy storage device 1000 of the third embodiment differs from the energy storage device 1000 of the first embodiment in that the bottom patch 300 is disposed on the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30, and the second surface 350 of the bottom patch 300 protrudes relative to the outer surface of the portion of the bottom film portion 133 covering the welding portion 70.

[0080] Specifically, in the energy storage device 1000 of the third embodiment, the first surface 330 of the bottom patch 300 is bonded to the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30, and the second surface 350 faces away from the outer surface of the bottom film portion 133, thereby enabling the bottom patch 300 to be installed on the outer surface of the bottom film portion 133 of the outer film 130 facing away from the bottom plate 30. For example, in this embodiment, the first surface 330 of the bottom patch 300 is bonded to the outer surface of the bottom film portion 133 facing away from the bottom plate 30, thereby enabling the bottom patch 300 to be bonded and fixed to the bottom film portion 133. In this case, the bottom patch 300 can be installed and removed by a peel-and-stick method, which improves installation efficiency.

[0081] The second surface 350 protrudes relative to the surface of the covering portion 63 of the bottom film portion 133 facing away from the soldering portion 70. Specifically, the second surface 350 protrudes relative to the outer surface of the covering portion 63, thereby causing the outer surface of the bottom patch 300 to protrude relative to the outer surface of the portion of the bottom film portion 133 covering the soldering portion 70, thereby causing the outer surface of the bottom patch 300 to protrude relative to the outer surface of the soldering portion 70. In this embodiment, the second surface 350 protrudes relative to the outer surface of the covering portion 63 in the negative direction of the Z axis. The height of the protrusion of the second surface 350 relative to the outer surface of the covering portion 63 is H, where H ≥ 0.

[0082] In this embodiment, there can be multiple bottom patches 300, and the multiple bottom patches 300 are spaced apart along the extension direction of the bottom membrane portion 133. The multiple bottom patches 300 cover the two ends of the bottom membrane portion 133 that are oppositely disposed along the extension direction. Specifically, the multiple bottom patches 300 include a first bottom patch 305 and a second bottom patch 307, and the first bottom patch 305 and the second bottom patch 307 respectively cover the two ends of the bottom membrane portion 133 that are oppositely disposed along the extension direction. The multiple bottom patches 300 can also include an intermediate bottom patch 309, which is located between the first bottom patch 305 and the second bottom patch 307, and is spaced apart from the first bottom patch 305 and the second bottom patch 307. For example, in this embodiment, there are three bottom patches 300, each of which is roughly rectangular, has a thickness of 0.2 mm to 0.5 mm, and is 50 mm long. The length of the three bottom patches 300 is 1 / 10 of the extended length of the bottom film portion 133. The three bottom patches 300 include a first bottom patch 305, a second bottom patch 307, and an intermediate bottom patch 309. It is understood that in other embodiments, there may be multiple intermediate bottom patches 309, and the multiple intermediate bottom patches 309 may be spaced apart from each other.

[0083] In the energy storage device 1000 provided in the embodiment of the present application, a bottom patch 300 is provided on the outer surface of the bottom film portion 133 of the outer film 130, and the outer surface of the bottom patch 300 is provided to protrude relative to the outer surface of the portion of the bottom film portion 133 covering the welding portion 70. Therefore, during the process of assembling the drag energy storage device 1000 to form an energy storage module, the bottom patch 300 can prevent the portion of the bottom film portion 133 of the outer film 130 covering the welding portion 70 from contacting the ground, thereby preventing the portion of the bottom film portion 133 covering the welding portion 70 from contacting and rubbing with the ground. This further prevents the welding portion 70 from piercing the outer film 130 and causing insulation failure of the outer film 130, thereby improving the safety of the energy storage device 1000 during use. In addition, the assembly of the housing 110 in the energy storage device 1000 does not need to be changed, the assembly dimensions of the bottom plate 30 in the housing 110 do not need to be modified, the assembly between the bottom plate 30 and the side shell 10 is not affected, and the assembly process of the housing 110 and the battery cell 200 is not affected, and mass production feasibility is high.

[0084] Specifically, in the energy storage device 1000 of the third embodiment, multiple bottom patches 300 are spaced apart along the extension direction of the bottom film portion 133. This not only reduces scratching of the outer film 130 by the welding portion 70, but also prevents the gaps between the multiple bottom patches 300 from affecting the heat dissipation of the energy storage device 1000. Furthermore, compared to the frame-shaped bottom patch 300 in the first embodiment, the bottom patch 300 in this embodiment is roughly rectangular, which reduces waste during the processing of the bottom patch 300, thereby lowering production costs.

[0085] In addition, in the third embodiment, by providing a plurality of bottom patches 300 covering two opposite ends of the bottom membrane portion 133 along the extension direction, it is ensured that during the process of towing the energy storage device 1000, the portion of the bottom membrane portion 133 of the outer membrane 130 covering the welding portion 70 will not be scratched by the ground. At the same time, less material is used for the bottom patches 300, thereby reducing production costs.

[0086] See also Figure 17 、 Figure 18 and Figure 19 , Figure 17 Schematic diagram of the structure of the energy storage device 1000 according to the fourth embodiment of the present application. Figure 18 for Figure 17 The exploded structural diagram of the energy storage device 1000 is shown. Figure 19 for Figure 17 Schematic diagram of the cross-sectional structure of portion E in the energy storage device 1000 is shown.

[0087] The energy storage device 1000 of the fourth embodiment differs from the energy storage device 1000 of the third embodiment in that the plurality of bottom patches 300 in the energy storage device 1000 of the fourth embodiment are arranged at intervals along the width direction of the bottom film portion 133 .

[0088] Specifically, in the energy storage device 1000 of the fourth embodiment, the first surface 330 of each bottom patch 300 is in contact with the outer surface of the bottom film portion 133 facing away from the bottom plate 30, and the second surface 350 faces away from the bottom film portion 133. The second surface 350 protrudes relative to the outer surface of the covering portion 63 of the bottom film portion 133 covering the welding portion 70, thereby causing the outer surface of the bottom patch 300 to protrude relative to the outer surface of the portion of the bottom film portion 133 covering the welding portion 70, thereby causing the outer surface of the bottom patch 300 to protrude relative to the outer surface of the welding portion 70.

[0089] In this embodiment, the extension direction of each bottom patch 300 is the same as the extension direction of the bottom film portion 133. The bottom patches 300 are spaced apart along the width direction of the bottom film portion 133. In this embodiment, the extension direction of the bottom patches 300 and the extension direction of the bottom film portion 133 are both along the X-axis. The extension length of each bottom patch 300 is greater than 1 / 2 of the extension length of the bottom film portion 133. For example, in this embodiment, there are two bottom patches 300, each having a width of 10 mm along the Y-axis. The two bottom patches 300 are spaced apart along the Y-axis.

[0090] In this embodiment, the bottom patch 300 is made of a thermally conductive material, such as a thermally conductive adhesive. For example, the thermal conductivity of the thermally conductive adhesive is close to that of the thermally conductive adhesive used to assemble the energy storage module. For example, the bottom patch 300 can be a graphite patch to ensure that the thermal conductivity of the bottom patch 300 fully meets the heat dissipation requirements of the energy storage module, thereby having a better positive effect on the performance of the energy storage device. It is understood that in the energy storage device 1000 of the first to third embodiments, the bottom patch 300 can also be made of a thermally conductive material.

[0091] In the energy storage device 1000 provided in the fourth embodiment, the outer surface of the bottom patch 300 protrudes relative to the outer surface of the portion of the bottom film portion 133 covering the welding portion 70. This allows the bottom patch 300 to prevent the portion of the bottom film portion 133 of the outer film 130 covering the welding portion 70 from contacting the ground during assembly of the drag energy storage device 1000 to form an energy storage module. This prevents friction between the portion of the bottom film portion 133 covering the welding portion 70 and the ground, thereby preventing the welding portion 70 from piercing the outer film 130 and causing insulation failure of the outer film 130. Furthermore, the multiple bottom patches 300 are spaced apart along the width of the bottom film portion 133, which not only reduces scratching of the outer film 130 by the welding portion 70, but also prevents the gaps between the multiple bottom patches 300 from affecting the heat dissipation of the energy storage device 1000.

[0092] The above disclosure is only a preferred embodiment of the present application, and it is certainly not intended to limit the scope of the rights of the present application. A person skilled in the art can understand that all or part of the processes of the above embodiments and equivalent changes made in accordance with the claims of the present application are still within the scope of the present application.

Claims

1. An energy storage device, characterized in that: The energy storage device includes a shell assembly and a bottom patch, the shell assembly includes a shell and an outer membrane, the shell includes a bottom plate, a side shell and a welding portion, the welding portion is connected between the bottom plate and the side shell, the outer surface of the welding portion protrudes in a direction away from the outer surface of the bottom plate, the outer membrane is covered on the outside of the shell, the bottom patch is provided in the shell assembly, and the outer surface of the bottom patch protrudes relative to the outer surface of the welding portion.

2. The energy storage device according to claim 1, characterized in that The projection of the bottom patch on the housing covers at least a portion of the outer surface of the welding portion.

3. The energy storage device according to claim 2, characterized in that The outer film includes a bottom film portion, which covers the outer surface of the bottom plate and the outer surface of the welding portion. The bottom patch is arranged on the outer surface of the bottom film portion away from the bottom plate.

4. The energy storage device according to claim 3, characterized in that The bottom patch is provided with an opening, which penetrates the bottom patch along the thickness direction of the bottom patch, and the projection of the opening on the shell is spaced apart from the welding portion.

5. The energy storage device according to claim 2, characterized in that The bottom patch is arranged on the outer surface of the shell and covers at least a portion of the outer surface of the welding portion. The outer film also covers the outer surface of the bottom patch away from the shell.

6. The energy storage device according to claim 5, characterized in that The bottom patch is arranged around the bottom plate, and the bottom patch is provided with an opening. The opening passes through the bottom patch along the thickness direction of the bottom patch and exposes at least a portion of the bottom plate.

7. The energy storage device according to claim 1, characterized in that The outer membrane includes a bottom membrane portion, which covers the outer surface of the bottom plate and the outer surface of the welding portion. The bottom patch is arranged on the outer surface of the bottom membrane portion, and the outer surface of the bottom patch protrudes relative to the outer surface of the portion of the bottom membrane portion covering the welding portion.

8. The energy storage device according to claim 7, characterized in that There are multiple bottom patches, and the multiple bottom patches are all arranged on the outer surface of the bottom film portion away from the bottom plate, and are spaced apart along the extension direction of the bottom film portion, or the extension direction of each bottom patch is the same as the extension direction of the bottom film portion, and the multiple bottom patches are spaced apart along the width direction of the bottom film portion.

9. The energy storage device according to any one of claims 1 to 7, characterized in that: The bottom patch is made of heat-conducting material.

10. An energy storage module, characterized in that: It comprises a box body and the energy storage device according to any one of claims 1 to 9, wherein the energy storage device is installed in the box body.

11. An electrical device, characterized in that: The electrical equipment has an energy storage device according to any one of claims 1 to 9, and the energy storage device is used to supply power to the electrical equipment, or the electrical equipment has an energy storage module according to claim 10, and the energy storage module is used to supply power to the electrical equipment.

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