Energy storage device shell, energy storage device and electric equipment

Abstract

The utility model discloses an energy storage device shell, an energy storage device and electric equipment. The energy storage device shell comprises a shell body, a first end cover and a first injection molding part. The shell is provided with a first opening; the first end cover seals the first opening, and the edge of the first end cover and the edge of the first opening of the shell are wound; the first injection molding part covers a first gap between the shell and the first end cover.

Description

Technical Field

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

[0002] As a new energy battery, secondary batteries have many advantages such as high energy density, long cycle life, good safety, and environmental protection, and have been widely used. As the demand for secondary batteries gradually increases, people's requirements for their performance in all aspects are also getting higher and higher.

[0003] In the related art, the battery includes a shell and a cover plate. When the cover plate is packaged with the shell, the cover plate needs to be fixed to the opening of the shell by laser welding. The laser welding process has the advantages of high cost and low processing efficiency, and it is easy to cause welding stress in the shell and / or the cover plate, which causes the battery to crack due to temperature changes after a period of use, thereby causing the battery seal to fail. Utility Model Content

[0004] The embodiments of the present application provide an energy storage device housing, an energy storage device and an electrical device, which achieve a sealed connection between the housing and the end cover through winding and injection molding processes, thereby solving the problems existing in the related art.

[0005] The energy storage device housing of the embodiment of the present application includes:

[0006] A housing having a first opening;

[0007] a first end cover, closing the first opening, wherein an edge of the first end cover is rolled around an edge of the first opening of the housing; and

[0008] The first injection molded part covers a first gap between the shell and the first end cover.

[0009] The energy storage device shell of the embodiment of the present application is sealed and connected to the first end cover by winding and injection molding. On the one hand, the sealing between the shell and the end cover is significantly improved to prevent leakage of the electrolyte; on the other hand, since the welding process is omitted, the cost is reduced while the processing efficiency is improved, and no welding stress is generated.

[0010] Optionally, part of the first injection-molded part is filled in the first gap.

[0011] In the embodiment of the present application, the first injection-molded part not only covers the first gap, but also fills the first gap, which can further improve the sealing performance.

[0012] Optionally, the shell includes a shell body and a first flange portion, the shell body includes a receiving cavity having the first opening, the first flange portion is connected to an edge of the first opening and is folded in a direction away from the receiving cavity;

[0013] The first end cover comprises a first cover body and a first curling portion, the first cover body closes the first opening, the first curling portion is connected to the outer periphery of the first cover body, and the first curling portion and the first flange portion are curled together;

[0014] The first injection molded part is coated on the outer peripheral surface of the shell body, and the first gap is formed between the first curling portion and the outer peripheral surface.

[0015] Optionally, the first flange portion includes a first flange and a second flange, the first flange is connected to the outer peripheral surface, the second flange is connected to an end of the first flange away from the shell body, and extends along the height direction of the energy storage device shell and in a direction away from the first opening;

[0016] The first curling portion covers the first flange and the second flange, and a portion of the first curling portion is inserted into a gap between the second flange and the shell body.

[0017] In the embodiment of the present application, part of the first rolled edge portion is inserted into the gap between the second flange and the shell body, which not only improves the sealing of the first rolled edge portion and the first flange portion after winding, but also makes the first rolled edge portion and the first flange portion more compact after winding, avoiding excessive occupation of radial space of the shell.

[0018] Optionally, the first curling portion includes a first curling, a second curling, a third curling, a fourth curling and a fifth curling connected in sequence;

[0019] The first curling edge is connected to the outer peripheral edge of the first cover body and is attached to the inner peripheral surface of the shell body;

[0020] The second curling edge covers the first flange, the third curling edge covers a side surface of the second flange facing away from the shell body, the fourth curling edge covers an end surface of the second flange facing away from the first flange, the fifth curling edge is inserted into the gap, and the first gap is formed between the fifth curling edge and the outer peripheral surface;

[0021] Wherein, the first injection molded part covers at least a portion of the fourth curled edge.

[0022] Optionally, the first injection molded part does not extend beyond a side surface of the third curled edge facing away from the second flange.

[0023] In the embodiment of the present application, since the first injection molded part does not extend beyond the surface of the third curled edge facing away from the second flange, the first injection molded part is prevented from being scratched, damaged or even falling off during transportation of the battery, thereby affecting the secondary sealing effect of the first injection molded part.

[0024] Optionally, the shell body further has a second opening, the second opening is communicated with the accommodating cavity, and the second opening and the first opening are arranged opposite to each other in the height direction of the energy storage device shell;

[0025] The shell further comprises a second flange portion connected to the edge of the second opening, and the second flange portion is folded in a direction away from the accommodating cavity.

[0026] Optionally, the inner surface of the second flange portion is an arc surface and is tangent to the inner circumferential surface of the shell body.

[0027] In the embodiment of the present application, since the inner surface of the second flange portion is designed to be an arc surface and is tangent to the inner circumferential surface of the shell body, the connection between the second flange portion and the shell body is a smooth transition, avoiding the formation of a sharp angle structure at the connection and further preventing scratches on the electrode assembly.

[0028] Optionally, the shell further includes an inclined portion, which is connected to an end of the second flange portion away from the shell body and extends obliquely from the second flange portion toward an axial direction away from the shell body.

[0029] Optionally, the energy storage device housing further includes:

[0030] A second end cover, comprising a second cover body and a second curling portion, wherein the second cover body closes the second opening, the second curling portion is connected to the outer periphery of the second cover body, and the second curling portion and the second flange portion are curled around each other;

[0031] The second injection molded part is wrapped around the outer peripheral surface of the shell body and covers the second gap between the second curling portion and the outer peripheral surface.

[0032] Optionally, the shell comprises a shell body and a third curling portion, the shell body comprises a receiving cavity having the first opening, the third curling portion is connected to an edge of the first opening, the third curling portion is wrapped around an edge of the first end cover, and covers an edge area of ​​a side surface of the first end cover facing away from the receiving cavity;

[0033] The first injection molded part covers a surface of the first end cover that is away from the accommodating cavity, and the first gap is formed between the edge area and the third curling portion.

[0034] Optionally, the shell includes a shell body and a fourth curling portion, the shell body includes a receiving cavity having the first opening, and the fourth curling portion is connected to an edge of the first opening;

[0035] The first end cover comprises a first cover body and a folded edge portion, wherein the first cover body closes the first opening, and the folded edge portion is connected to the outer periphery of the first cover body and is bent in a direction away from the accommodating cavity;

[0036] The fourth curling portion is wrapped around the folding portion; the first injection molded part covers a side surface of the first cover body facing away from the accommodating cavity, and the first gap is formed between the fourth curling portion and a side surface of the first cover body facing away from the accommodating cavity.

[0037] Optionally, the first end cover is further provided with a notched groove at a position close to the first opening;

[0038] Wherein, the notch groove is not covered by the first injection molded part.

[0039] In the embodiment of the present application, by providing a notch groove on the first end cover, there is no need to separately process the explosion-proof valve, and further there is no need to install the explosion-proof valve on the top cover by welding, which simplifies the processing and avoids introducing welding stress.

[0040] Optionally, the shell is not covered by the first injection molded part, and a notch groove is provided near the first opening.

[0041] In the embodiment of the present application, by providing a notched groove on the shell, there is no need to separately process the explosion-proof valve, and further there is no need to install the explosion-proof valve on the top cover by welding, which simplifies the processing and avoids introducing welding stress.

[0042] The energy storage device of the embodiment of the present application comprises the energy storage device housing and the electrode assembly as described in any one of the above items, and the electrode assembly is accommodated in the accommodating cavity of the energy storage device housing.

[0043] The electrical equipment of the embodiment of the present application includes the above-mentioned energy storage device, and the energy storage device supplies power to the electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 is a schematic structural diagram of a household energy storage system according to an exemplary embodiment.

[0045] Figure 2 It is a schematic diagram of the energy storage device housing of the first embodiment of the present application.

[0046] Figure 3 yes Figure 2 Schematic diagram of the decomposition.

[0047] Figure 4 is along Figure 2 Section view along the AA cutting line.

[0048] Figure 5 yes Figure 4 A local enlarged view of point X1 in the middle.

[0049] Figure 6 yes Figure 4 A local enlarged view of the X2 point in the middle.

[0050] Figure 7 It is a schematic diagram of the energy storage device housing of the second embodiment of the present application.

[0051] Figure 8 is along Figure 7 Section view along the BB cutting line.

[0052] Fig. 9 It is a schematic diagram of the energy storage device housing of the third embodiment of the present application.

[0053] Fig.10 is along Fig. 9 Section view along the CC cutting line.

[0054] Fig.11 It is a cross-sectional view of the energy storage device housing of the fourth embodiment of the present application.

[0055] Fig.12 It is a cross-sectional view of the energy storage device housing of the fifth embodiment of the present application.

[0056] Fig.13 It is a cross-sectional view of the energy storage device housing of the sixth embodiment of the present application.

[0057] Fig.14 is a schematic diagram showing an electric device according to an exemplary embodiment.

[0058] The reference numerals are described as follows:

[0059] 1. Energy storage device; 2. Electric energy conversion device; 3. User load; 4. Electrical equipment;

[0060] 10. Energy storage device housing;

[0061] 100, shell; 110, shell body; 111, first opening; 112, outer peripheral surface; 113, accommodating cavity; 114, inner peripheral surface; 115, second opening; 120, first flange portion; 121, first flange; 122, second flange; 130, second flange portion; 131, third flange; 132, fourth flange; 140, inclined portion; 150, third curling portion; 160, fourth curling portion;

[0062] 200, first end cover; 200a, edge region; 210, first cover body; 220, first curling portion; 221, first curling; 222, second curling; 223, third curling; 224, fourth curling; 225, fifth curling; 230, folding portion;

[0063] 300, first injection molded part;

[0064] 400, second end cover; 410, second cover body; 420, second curling portion; 421, sixth curling portion; 422, seventh curling portion; 423, eighth curling portion; 424, ninth curling portion; 425, tenth curling portion;

[0065] 500, second injection molded part;

[0066] 600, notched groove;

[0067] D. Height direction. DETAILED DESCRIPTION

[0068] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this application will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0069] It is understood that the terms "including" and "having" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or components that are inherent to these processes, methods, products, or devices.

[0070] Since the energy people need is highly temporal and spatial, in order to rationally utilize energy and improve energy utilization, it is necessary to use a medium or device to store one form of energy in the same way or convert it into another form of energy, and then release it in a specific form of energy based on future application needs.

[0071] The current green energy mainly includes solar energy, wind energy, hydropower, etc. However, solar energy and wind energy generally have problems of strong intermittency and large volatility, which will cause unstable voltage of the green power grid (not enough electricity during peak hours and too much electricity during low hours). Unstable voltage will cause damage to electricity. Therefore, it may cause the problem of "wind and solar power abandonment" due to insufficient electricity demand or insufficient grid acceptance capacity.

[0072] To solve the problem of insufficient electricity demand or insufficient grid acceptance capacity, we must rely on energy storage devices. That is, the energy storage device converts electrical energy into other forms of energy through physical or chemical means and stores it, and then converts the energy stored in the energy storage device into electrical energy when needed. In simple terms, the energy storage device is similar to a large "power bank", which stores electrical energy when there is sufficient light energy and wind energy, and releases the stored electrical energy when needed.

[0073] At present, energy storage (i.e. energy storage) has a wide range of application scenarios, including power generation side energy storage, grid side energy storage, renewable energy grid-connected energy storage and user side energy storage. The corresponding types of energy storage devices include:

[0074] (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, achieve load matching of electric energy in time and space, enhance the ability to absorb renewable energy, and are of great significance in grid system backup, relieving peak load power supply pressure, and peak and frequency regulation;

[0075] (2) The main operating mode of small and medium-sized energy storage cabinets used in industrial and commercial energy storage scenarios (banks, shopping malls, etc.) on the user side and small household energy storage boxes used in home energy storage scenarios on the user side is "peak shaving and valley filling". Since there is a large price difference in electricity charges 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, the electricity in the energy storage equipment is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas prone to natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing themselves and the power grid with backup power, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0076] Take the household energy storage scenario in user-side energy storage as an example to illustrate. Figure 1 A household energy storage system is shown, which includes an energy storage device 1 and an electric energy conversion device 2 (such as a photovoltaic panel), and a user load 3 (such as a street lamp, household appliances, etc.). The energy storage device 1 is a small energy storage box that can be mounted on an outdoor wall by wall hanging. Specifically, the electric energy conversion device 2 can convert solar energy into electric energy during the period of low electricity prices, and store it through the energy storage device 1, and then supply the user load 3 for use during the peak electricity price, or supply the user load 3 for use when the power grid is out of power / power outage.

[0077] In combination with the above-mentioned situation of storing energy by physical or electrochemical means, taking electrochemical energy storage as an example, the energy storage device 1 includes at least one group of chemical batteries, using the chemical elements in the chemical batteries as energy storage media, so as to realize the charging and discharging process through the chemical reaction or change of the energy storage medium. In simple terms, the electric energy generated by light energy and wind energy is stored in at least one group of chemical batteries through the chemical reaction or change of the energy storage medium, and when the use of external electric energy reaches a peak, the electric energy stored in at least one group of chemical batteries is released for use through the chemical reaction or change of the energy storage medium, or transferred to a place where electric energy is scarce for use.

[0078] The embodiment of the present application provides an energy storage device 1, which can be but is not limited to a single cell (secondary battery), a battery module, a battery pack, a battery system, etc. composed of single cells. As for the single cell, it can be a lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc. The single cell can be cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this. Next, taking the energy storage device 1 as a cylindrical single cell as an example, the energy storage device 1 is explained in detail.

[0079] like Figure 2 and Figure 3 As shown, the energy storage device 1 of the embodiment of the present application includes an energy storage device housing 10 and an electrode assembly (not shown in the figure), and the electrode assembly is accommodated in the energy storage device housing 10.

[0080] For the electrode assembly, it may include a positive electrode sheet, a negative electrode sheet and a separator. The single cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, the positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer, and the positive electrode collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, the negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer, and the negative electrode collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. The material of the isolation film may be PP or PE, etc. In addition, the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.

[0081] The material of the energy storage device housing 10 can be one or more of tin-plated iron, chrome-plated iron, coated iron and aluminum alloy.

[0082] Please continue reading Figure 2 and Figure 3 As shown, the energy storage device housing 10 of the embodiment of the present application includes a housing 100 , a first end cover 200 and a second end cover 400 .

[0083] The housing 100 is substantially cylindrical and includes a housing cavity 113 having a first opening 111 and a second opening 115. The housing cavity 113 is used to accommodate the electrode assembly. The first opening 111 and the second opening 115 are disposed opposite to each other along the height direction D of the energy storage device housing 10.

[0084] Among them, one of the first end cover 200 and the second end cover 400 can be used as the upper cover of the energy storage device housing 10, and the other of the first end cover 200 and the second end cover 400 can be used as the bottom cover of the energy storage device housing 10. In the embodiment of the present application, the first end cover 200 is used as the upper cover of the energy storage device housing 10, and the second end cover 400 is used as the bottom cover of the energy storage device housing 10. The thickness of the second end cover 400 can be between 0.5 mm and 2 mm, for example, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, and 2 mm.

[0085] As an example, the wall thickness of the housing 100 may be between 0.1 mm and 0.8 mm, such as 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, and 0.8 mm, but is not limited thereto.

[0086] The shell 100 includes a shell body 110, a first flange portion 120 and a second flange portion 130. The shell body 110 is cylindrical and encloses a housing cavity 113 for accommodating an electrode assembly. The shell body 110 has a first opening 111 and a second opening 115 at both axial ends. The first flange portion 120 is connected to the edge of the first opening 111 and is folded away from the housing cavity 113. The second flange portion 130 is connected to the edge of the second opening 115 and is folded away from the housing cavity 113.

[0087] The first end cover 200 includes a first cover body 210 and a first curling portion 220. The first cover body 210 closes the first opening 111. The first curling portion 220 is connected to the outer periphery of the first cover body 210, and the first curling portion 220 and the first flange portion 120 are rolled around each other. The second end cover 400 includes a second cover body 410 and a second curling portion 420. The second cover body 410 closes the second opening 115. The second curling portion 420 is connected to the outer periphery of the second cover body 410, and the second curling portion 420 and the second flange portion 130 are rolled around each other.

[0088] like Figures 4 to 6As shown, the energy storage device housing 10 of the embodiment of the present application further includes a first injection molded part 300 and a second injection molded part 500. The first injection molded part 300 is wrapped around the outer peripheral surface 112 of the shell body 110, and covers the first gap G1 between the first curling portion 220 and the outer peripheral surface 112. The second injection molded part 500 is wrapped around the outer peripheral surface 112 of the shell body 110, and covers the second gap G2 between the second curling portion 420 and the outer peripheral surface 112.

[0089] In the energy storage device housing 10 of the embodiment of the present application, the first flange portion 120 of the housing 100 and the first curling portion 220 of the first end cover 200 are wound around each other, so that the housing 100 is wound and connected with the first end cover 200, and the second flange portion 130 of the housing 100 and the second curling portion 420 of the second end cover 400 are wound around each other, so that the housing 100 is wound and connected with the second end cover 400. After the flange portion and the curling portion are wound and connected with each other, they can play a sealing role to a certain extent. Compared with the laser welding method used in the relevant technology, the winding connection of the embodiment of the present application has the advantages of low cost and high processing efficiency, and does not generate welding stress, and the product reliability is high.

[0090] In addition, the first injection molded part 300 covers the first gap G1 between the first curling portion 220 and the outer peripheral surface 112 of the shell body 110, and the second injection molded part 500 covers the second gap G2 between the second curling portion 420 and the outer peripheral surface 112 of the shell body 110, further improving the sealing between the shell 100 and the first end cover 200 and between the shell 100 and the second end cover 400, effectively preventing leakage of the electrolyte in the shell 100.

[0091] Therefore, the energy storage device shell 10 of the embodiment of the present application seals the shell 100 and the first end cover 200 and the shell 100 and the second end cover 400 by winding and injection molding. On the one hand, the sealing between the shell 100 and the end cover is significantly improved to prevent leakage of the electrolyte; on the other hand, since the welding process is omitted, the cost is reduced while the processing efficiency is improved, and no welding stress is generated.

[0092] It can be understood that the first injection-molded part 300 and the second injection-molded part 500 are connected to the outer peripheral surface 112 of the shell body 110 through an injection molding process, and the material thereof may be plastic.

[0093] In one embodiment, part of the first injection molded part 300 is also filled in the first gap G1 .

[0094] In the embodiment of the present application, the first injection molded part 300 not only covers the first gap G1 between the first curling portion 220 and the outer peripheral surface 112 of the shell body 110 , but also fills the first gap G1 , which can further improve the sealing performance.

[0095] The first flange portion 120 includes a first flange 121 and a second flange 122, both of which are annular structures. The first flange 121 is connected to the outer peripheral surface 112 in a circumferential direction away from the outer peripheral surface 112, and extends from the outer peripheral surface 112 in an axial direction away from the shell body 110. The second flange 122 is connected to one end of the first flange 121 away from the shell body 110, and extends along the height direction D of the energy storage device housing 10 and in a direction away from the first opening 111. In the embodiment of the present application, the second flange 122 extends from the first flange 121 in a direction close to the second opening 115. The first curling portion 220 covers the first flange 121 and the second flange 122, and a portion of the first curling portion 220 is inserted into the gap between the second flange 122 and the shell body 110.

[0096] In the embodiment of the present application, part of the first curled edge portion 220 is inserted into the gap between the second flange 122 and the shell body 110, which not only improves the sealing of the first curled edge portion 220 and the first flange portion 120 after winding, but also makes the first curled edge portion 220 and the first flange portion 120 more compact after winding, thereby avoiding occupying too much radial space of the shell 100.

[0097] Please continue reading Figure 5 The first curling portion 220 includes a first curling portion 221, a second curling portion 222, a third curling portion 223, a fourth curling portion 224 and a fifth curling portion 225 which are connected in sequence; the first curling portion 221 is connected to the outer periphery of the first cover body 210 and is attached to the inner circumference 114 of the shell body 110; the second curling portion 222 covers the first flange 121, the third curling portion 223 covers the side surface of the second flange 122 which is away from the shell body 110, the fourth curling portion 224 covers the end surface of the second flange 122 which is away from the first flange 121, the fifth curling portion 225 is inserted into the gap, and a first gap G1 is formed between the fifth curling portion 225 and the outer circumference 112; wherein, the first injection molded part 300 covers at least part of the fourth curling portion 224.

[0098] like Figure 5 As shown, the first injection molded part 300 does not extend beyond the surface of the third curled edge 223 facing away from the second flange 122 , thereby preventing the first injection molded part 300 from being scratched by other foreign objects during transportation of the battery, causing damage or even falling off, thereby affecting the secondary sealing effect of the first injection molded part 300 .

[0099] In one embodiment, the cross-sectional shape of the first injection molded part 300 may be a right triangle, but is not limited thereto.

[0100] It should be noted that the single cell battery in the related technology is usually also equipped with an explosion-proof valve. When the gas in the single cell battery reaches the explosion threshold of the explosion-proof valve, the explosion-proof valve bursts open and discharges the gas in the single cell battery in time to avoid bulging or even explosion of the battery, thereby ensuring the safety of the battery.

[0101] The explosion-proof valve in the related technology is usually welded to the top cover of the single cell by laser welding. The explosion-proof valve and the top cover are produced separately and then assembled by welding. The overall processing flow is relatively long, and the welding process will introduce welding stress, which will affect the service life of the top cover and the explosion-proof valve.

[0102] In one embodiment, the housing 100 is not covered by the first injection molded part 300 , and a notch groove 600 is disposed near the first opening 111 .

[0103] In the embodiment of the present application, the outer circumferential surface 112 of the shell body 110 is not covered by the first injection molded part 300, and a notch groove 600 with an opening facing away from the accommodating cavity 113 is provided near the first curling portion 220. By providing the notch groove 600 on the outer circumferential surface 112 of the shell body 110, there is no need to separately process the explosion-proof valve, and further, there is no need to install the explosion-proof valve on the top cover by welding, which is simple to process and avoids introducing welding stress.

[0104] In one embodiment, the length of the notch groove 600 is 1 / 2 to 3 / 4 of the circumference of the shell body 110 .

[0105] In one embodiment, the cross-sectional shape of the notch groove 600 may be rectangular, V-shaped, trapezoidal, U-shaped, etc., which is not limited in the present application.

[0106] like Figure 6 As shown, the second flange portion 130 includes a third flange 131 and a fourth flange 132, and the third flange 131 and the fourth flange 132 are both annular structures. The third flange 131 is connected to the outer peripheral surface 112 of the shell body 110 around and extends from the outer peripheral surface 112 to the axial direction away from the shell body 110. The fourth flange 132 is connected to one end of the third flange 131 away from the shell body 110, and extends along the height direction D of the energy storage device housing 10 and in a direction away from the second opening 115.

[0107] In the embodiment of the present application, the fourth flange 132 and the third flange 131 extend toward the first opening 111. The second flange portion 420 covers the third flange 131 and the fourth flange 132, and a portion of the second flange portion 420 is inserted into the gap between the fourth flange 132 and the shell body 110.

[0108] In the embodiment of the present application, part of the second curled edge portion 420 is inserted into the gap between the fourth flange 132 and the shell body 110, which not only improves the sealing of the second curled edge portion 420 and the second flange portion 130 after winding, but also makes the second curled edge portion 420 and the second flange portion 130 more compact after winding, thereby avoiding excessive occupation of radial space of the shell 100.

[0109] Please continue reading Figure 6The second curling portion 420 includes a sixth curling edge 421, a seventh curling edge 422, an eighth curling edge 423, a ninth curling edge 424 and a tenth curling edge 425 which are connected in sequence; the sixth curling edge 421 is connected to the outer periphery of the second cover body 410 and is attached to the inner circumference 114 of the shell body 110; the seventh curling edge 422 covers the third flange 131, the eighth curling edge 423 covers the side surface of the fourth flange 132 facing away from the shell body 110, the ninth curling edge 424 covers the end surface of the fourth flange 132 facing away from the third flange 131, the tenth curling edge 425 is inserted into the gap, and a second gap G2 is formed between the tenth curling edge 425 and the outer circumference 112; wherein, the first injection molded part 300 covers at least part of the ninth curling edge 424.

[0110] It should be noted that although Figure 5 and Figure 6 The first to fourth flanges (121, 122, 131, 132) and the first to tenth curling edges (221, 222, 223, 224, 225, 421, 422, 423, 424, 425) are all straight-line, but should not be limited thereto. When the flange portion and the curling portion are wound around each other, a certain flange and / or curling edge of the first to fourth flanges (121, 122, 131, 132) and the first to tenth curling edges (221, 222, 223, 224, 225, 421, 422, 423, 424, 425) may be compressed to bend and form an arc shape, and whether the flange or curling edge is straight-line or arc-shaped, it should be within the protection scope of the embodiments of the present application.

[0111] It can be understood that, in the above embodiment, the first end cover 200 and the second end cover 400 are connected to the housing 100 by winding and injection molding.

[0112] In another embodiment, the first end cap 200 is connected to the housing 100 by winding and injection molding, and the second end cap 400 can be connected to the housing 100 in one piece. In yet another embodiment, the first end cap 200 is connected to the housing 100 by winding and injection molding, and the second end cap 400 is connected to the housing 100 by laser welding.

[0113] like Figure 7 and Figure 8 As shown, the similarities between the energy storage device housing 10 of the second embodiment of the present application and the energy storage device housing 10 of the first embodiment of the present application are not repeated, and the difference lies in that:

[0114] A notch groove 600 is formed at a position of the first end cover 200 close to the first opening 111 .

[0115] In the embodiment of the present application, the first cover body 210 is further provided with a notch groove 600 near the first curling portion 220 , the notch groove 600 opening facing away from the accommodating cavity 113 , wherein the notch groove 600 is not covered by the first injection molded part 300 .

[0116] In one embodiment, the notch groove 600 is disposed near the first curling edge 221. The first cover body 210 is a circular plate structure, the notch groove 600 extends in an arc shape, and the length of the notch groove 600 is 1 / 2 to 3 / 4 of the circumference of the first cover body 210.

[0117] like Fig. 9 and Fig.10 As shown, the similarities between the energy storage device housing 10 of the third embodiment of the present application and the energy storage device housing 10 of the first embodiment of the present application are not repeated here, and the difference lies in that:

[0118] The energy storage device housing 10 of the third embodiment of the present application includes a housing 100 and a first end cover 200, and the first end cover 200 can be used as the bottom cover of the energy storage device housing 10. The housing 100 includes a housing body 110, a first flange portion 120, and a second flange portion 130. The housing body 110 is cylindrical and encloses a housing cavity 113 for accommodating an electrode assembly. The housing body 110 is provided with a first opening 111 and a second opening 115 at both axial ends thereof. The first flange portion 120 is connected to the edge of the first opening 111 and is folded in a direction away from the housing cavity 113. The second flange portion 130 is connected to the edge of the second opening 115 and is folded in a direction away from the housing cavity 113.

[0119] The first end cover 200 and the housing 100 can be sealed and connected in the manner of the first embodiment, which will not be described in detail herein. The second flange portion 130 is connected to the edge of the second opening 115 and is folded in a direction away from the accommodating cavity 113 .

[0120] It should be noted that in the related art, the opening of the shell is usually designed as a straight cylinder with burrs. When the electrode assembly is inserted through the opening, the burrs at the opening easily scratch the electrode assembly, causing the electrode assembly to be scrapped and reducing the production yield.

[0121] In the embodiment of the present application, since the second flange portion 130 of the shell 100 is folded in a direction away from the accommodating cavity 113, the second flange portion 130 forms a flared structure. When the electrode assembly is loaded into the accommodating cavity 113 through the second opening 115, the shell 100 will not scratch the electrode assembly, thereby ensuring the production yield.

[0122] The second flange portion 130 is inclined from the edge of the second opening 115 in a direction away from the axis of the shell body 110 , so that the second flange portion 130 forms a bell-mouth shape.

[0123] In one embodiment, the inner surface 133 of the second flange portion 130 is an arc surface and is tangent to the inner circumferential surface 114 of the shell body 110. Since the inner surface 133 of the second flange portion 130 is designed as an arc surface and is tangent to the inner circumferential surface 114 of the shell body 110, the connection between the second flange portion 130 and the shell body 110 is a smooth transition, avoiding the formation of a sharp angle structure at the connection, and further preventing scratches on the electrode assembly.

[0124] like Fig.11 As shown, the similarities between the energy storage device housing 10 of the fourth embodiment of the present application and the energy storage device housing 10 of the third embodiment of the present application are not repeated here, and the difference lies in that:

[0125] The housing 100 further includes a ring-shaped inclined portion 140 , which is connected to an end of the second flange portion 130 away from the housing body 110 , and extends obliquely from the second flange portion 130 toward an axial direction away from the housing body 110 .

[0126] The inner surface and the outer surface of the annular structure formed by the inclined portion 140 may both be conical surfaces, so that the inclined portion 140 forms a bell-mouth shape.

[0127] like Fig.12 As shown, the similarities between the energy storage device housing 10 of the fifth embodiment of the present application and the energy storage device housing 10 of the first embodiment of the present application are not repeated here, and the difference lies in that:

[0128] The housing 100 includes a housing body 110 and a third curling portion 150. The housing body 110 includes a housing cavity 113 having a first opening 111. The third curling portion 150 is connected to the edge of the first opening 111. The third curling portion 150 wraps around the edge of the first end cover 200 and covers an edge region 200a of a side surface of the first end cover 200 that is away from the housing cavity 113. Since the third curling portion 150 wraps around the edge of the first end cover 200, a sealed connection between the first end cover 200 and the housing 100 is achieved to a certain extent.

[0129] The first injection molded part 300 covers a surface of the first end cover 200 facing away from the accommodating cavity 113 , and a first gap G1 is formed between the edge region 200 a and the third curling portion 150 .

[0130] The notch groove may be formed on the first end cover 200 or the housing 100 .

[0131] like Fig.13 As shown, the similarities between the energy storage device housing 10 of the sixth embodiment of the present application and the energy storage device housing 10 of the first embodiment of the present application are not repeated here, and the difference lies in that:

[0132] The shell 100 includes a shell body 110 and a fourth curling portion 160, the shell body 110 includes a accommodating cavity 113 with a first opening 111, and the fourth curling portion 160 is connected to the edge of the first opening 111; the first end cover 200 includes a first cover body 210 and a folding portion 230, the first cover body 210 closes the first opening 111, the folding portion 230 is connected to the outer periphery of the first cover body 210, and is bent in the direction away from the accommodating cavity 113; the fourth curling portion 160 is covered by the folding portion 230; the first injection molded part 300 covers a side surface of the first cover body 210 facing away from the accommodating cavity 113, and a first gap G1 is formed between the fourth curling portion 160 and a side surface of the first cover body 210 facing away from the accommodating cavity 113.

[0133] The notch groove may be formed on the first end cover 200 or the housing 100 .

[0134] like Fig.14 As shown, the embodiment of the present application further provides an electric device 4, which includes the energy storage device 1 described in any of the above embodiments, and the energy storage device 1 supplies power to the electric device 4. In this way, for the electric device 4 including the energy storage device 1 described above, the working stability of the electric device 4 can be improved, the probability of the electric device 4 downtime can be reduced, and the safety of the use of the electric device 4 can be improved.

[0135] Among them, the power-consuming device 4 can be new energy vehicles, electronic products (mobile phones, cameras, tablet computers, lights), servers and other devices that require electricity.

[0136] It is understandable that the various embodiments / implementations provided in the present application can be combined with each other without causing any contradiction, and will not be illustrated one by one here.

[0137] In the application embodiments, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. The terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the application embodiments can be understood according to the specific circumstances.

[0138] In the description of the application embodiments, it should be understood that the directions or positional relationships indicated by the terms "up", "down", "left", "right", "front", "back", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the application embodiments and simplifying the description, rather than indicating or implying that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation, and therefore, should not be understood as a limitation on the application embodiments.

[0139] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the application embodiment. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0140] The above are only preferred embodiments of the application embodiments and are not intended to limit the application embodiments. For those skilled in the art, the application embodiments may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the application embodiments shall be included in the protection scope of the application embodiments.

Claims

1. A housing of an energy storage device, characterized in that: include: A housing having a first opening; A first end cover, closing the first opening, wherein an edge of the first end cover is wound around an edge of the first opening of the housing; as well as The first injection molded part covers a first gap between the shell and the first end cover.

2. The energy storage device housing according to claim 1, characterized in that: Part of the first injection molded part fills the first gap.

3. The energy storage device housing according to claim 1, characterized in that: The shell comprises a shell body and a first flange portion, the shell body comprises a receiving cavity having the first opening, the first flange portion is connected to an edge of the first opening and is folded in a direction away from the receiving cavity; The first end cover comprises a first cover body and a first curling portion, the first cover body closes the first opening, the first curling portion is connected to the outer periphery of the first cover body, and the first curling portion and the first flange portion are curled together; The first injection molded part is coated on the outer peripheral surface of the shell body, and the first gap is formed between the first curling portion and the outer peripheral surface.

4. The energy storage device housing according to claim 3, characterized in that: The first flange portion includes a first flange and a second flange, the first flange is connected to the outer peripheral surface, the second flange is connected to an end of the first flange away from the shell body, and extends along the height direction of the energy storage device shell and in a direction away from the first opening; The first curling portion covers the first flange and the second flange, and a portion of the first curling portion is inserted into a gap between the second flange and the shell body.

5. The energy storage device housing according to claim 4, characterized in that: The first curling portion includes a first curling, a second curling, a third curling, a fourth curling and a fifth curling connected in sequence; The first curling edge is connected to the outer peripheral edge of the first cover body and is attached to the inner peripheral surface of the shell body; The second curling edge covers the first flange, the third curling edge covers a side surface of the second flange facing away from the shell body, the fourth curling edge covers an end surface of the second flange facing away from the first flange, the fifth curling edge is inserted into the gap, and the first gap is formed between the fifth curling edge and the outer peripheral surface; Wherein, the first injection molded part covers at least a portion of the fourth curled edge.

6. The energy storage device housing according to claim 5, characterized in that: The first injection molded part does not extend beyond a side surface of the third curled edge facing away from the second flange.

7. The energy storage device housing according to claim 3, characterized in that: The shell body further has a second opening, the second opening is communicated with the accommodating cavity, and the second opening and the first opening are arranged opposite to each other in the height direction of the energy storage device shell; The shell further comprises a second flange portion connected to the edge of the second opening, and the second flange portion is folded in a direction away from the accommodating cavity.

8. The energy storage device housing according to claim 7, characterized in that: The inner surface of the second flange portion is an arc surface and is tangent to the inner circumferential surface of the shell body.

9. The energy storage device housing according to claim 8, characterized in that: The shell further includes an inclined portion, which is connected to an end of the second flange portion away from the shell body and extends obliquely from the second flange portion toward an axial direction away from the shell body.

10. The energy storage device housing according to claim 7, characterized in that: The energy storage device housing also includes: A second end cover, comprising a second cover body and a second curling portion, wherein the second cover body closes the second opening, the second curling portion is connected to the outer periphery of the second cover body, and the second curling portion and the second flange portion are curled around each other; The second injection molded part is wrapped around the outer peripheral surface of the shell body and covers the second gap between the second curling portion and the outer peripheral surface.

11. The energy storage device housing according to claim 1, characterized in that: The shell comprises a shell body and a third curling portion, the shell body comprises a receiving cavity having the first opening, the third curling portion is connected to an edge of the first opening, the third curling portion wraps around an edge of the first end cover, and covers an edge area of ​​a side surface of the first end cover facing away from the receiving cavity; The first injection molded part covers a surface of the first end cover that is away from the accommodating cavity, and the first gap is formed between the edge area and the third curling portion.

12. The energy storage device housing according to claim 1, characterized in that: The housing comprises a housing body and a fourth curling portion, the housing body comprises a receiving cavity having the first opening, and the fourth curling portion is connected to an edge of the first opening; The first end cover comprises a first cover body and a folded edge portion, wherein the first cover body closes the first opening, and the folded edge portion is connected to the outer periphery of the first cover body and is bent in a direction away from the accommodating cavity; The fourth curling portion is wrapped around the folding portion; the first injection molded part covers a side surface of the first cover body facing away from the accommodating cavity, and the first gap is formed between the fourth curling portion and a side surface of the first cover body facing away from the accommodating cavity.

13. The energy storage device housing according to claim 1, characterized in that: The first end cover is also provided with a notched groove near the first opening; Wherein, the notch groove is not covered by the first injection molded part.

14. The energy storage device housing according to claim 1, characterized in that: The housing is not covered by the first injection molded part, and a notch groove is provided near the first opening.

15. An energy storage device, characterized in that: include: The energy storage device housing according to any one of claims 1 to 14; as well as The electrode assembly is accommodated in the energy storage device shell.

16. An electrical equipment, characterized in that: It includes the energy storage device as described in claim 15, and the energy storage device supplies power to the electrical equipment.

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