Energy storage device and electric equipment

Abstract

The invention discloses an energy storage device and electric equipment, and relates to the technical field of energy storage. The energy storage device comprises a shell, an electrode assembly and an end cover assembly, the shell comprises a bottom plate, a cylinder and a sealing piece, the bottom plate and the cylinder define a containing cavity with an opening in one end, the bottom plate is provided with a welding hole and a first welding part exposed at the welding hole, and the sealing piece is sealed and limited in the welding hole; the electrode assembly is accommodated in the accommodating cavity and is provided with a second welding part, and the second welding part is electrically connected with the first welding part; the end cover assembly seals the opening of the accommodating cavity and is electrically connected with the electrode assembly. According to the embodiment of the invention, the welding of the first welding part and the second welding part can be realized through the independently arranged welding hole, namely, the electric connection of the bottom plate and the electrode assembly is realized, so that the sealing reliability of the energy storage device is ensured, and the production yield of the energy storage device is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and more particularly, to an energy storage device and an electrical device. Background Art

[0002] A secondary battery (Rechargeable battery), also known as a rechargeable battery or a storage battery, refers to a battery that can be activated by charging after discharge and can continue to be used. The recyclable characteristics of secondary batteries have gradually made them the main power source of electrical devices. As the demand for secondary batteries increases, people's requirements for their various performances are also getting higher and higher, especially for the service life.

[0003] In related technologies, a secondary battery usually consists of a housing, an electrode assembly, and an end cap assembly. In the actual production process, the housing, the electrode assembly, and the end cap assembly are manufactured separately. Then, a transfer member is welded to the first tab of the electrode assembly, and a current collector is used to weld the electrode terminal included in the end cap assembly and the second tab of the electrode assembly respectively. Then, the electrode assembly is placed into the housing, and the transfer member is welded to the bottom of the housing, and the opening of the housing is sealed with the end cap assembly to complete the basic structure of the secondary battery.

[0004] Among them, the bottom of the housing has a through mounting hole, the surface of the transfer member facing away from the electrode assembly has a convex bulge, and a liquid injection hole penetrating the convex bulge; when the electrode assembly is inserted into the housing, the convex bulge on the transfer member extends into the mounting hole, and the convex bulge is fixedly connected to the bottom of the housing by seam welding. Furthermore, the liquid injection of the energy storage device can be completed through the liquid injection hole on the convex bulge.

[0005] However, in related technologies, when the liquid injection is completed and the liquid injection hole is sealed, it is difficult to ensure the sealing performance of the liquid injection hole, thereby reducing the production yield of the energy storage device. Therefore, there is an urgent need for an energy storage device that is convenient for improving the sealing yield of the liquid injection hole. Summary of the Invention

[0006] A main object of the present application is to provide an energy storage device and an electrical device with a high sealing yield of the liquid injection hole.

[0007] To achieve the above application object, the present application adopts the following technical solutions: According to one aspect of the present application, there is provided an energy storage device, including: a housing, including a bottom plate, a cylinder, and a seal, the bottom plate is connected to the cylinder and encloses a receiving cavity with one end open, the bottom plate has a welding hole, and a first welding portion exposed at the welding hole, the seal is sealed and limited in the welding hole; an electrode assembly, received in the receiving cavity, and having a second welding portion, the second welding portion is electrically connected to the first welding portion; an end cap assembly, sealing the opening of the receiving cavity, and electrically connected to the wound core.

[0008] In the embodiments of the present application, through the separately provided welding holes, the welding of the first welding part and the second welding part can be realized, that is, the electrical connection between the bottom plate and the electrode assembly can be realized, so as to ensure the reliability of the seal of the energy storage device, and further improve the production yield of the energy storage device.

[0009] According to an embodiment of the present application, the welding hole is a blind hole with the orifice facing away from the accommodating cavity, and the first welding part is formed at the bottom of the welding hole.

[0010] In the embodiments of the present application, an integrated first welding part can be formed at the welding hole to simplify the structure of the bottom plate, thereby simplifying the structure of the energy storage device and improving the assembly efficiency.

[0011] According to an embodiment of the present application, the seal includes an explosion-proof valve, and the bottom of the welding hole has a first ventilation hole communicating with the accommodating cavity.

[0012] In the embodiments of the present application, through the arrangement of the first ventilation hole at the bottom of the hole, it is convenient to improve the alignment efficiency between the first welding part and the second welding part, and improve the welding reliability between the first welding part and the second welding part; it can also ensure the reliability of the opening of the seal based on the communication between the first ventilation hole and the accommodating cavity.

[0013] According to an embodiment of the present application, the energy storage device includes a connecting piece, the connecting piece is located in the accommodating cavity and is electrically connected to the housing, and the connecting piece has the first welding part.

[0014] In the embodiments of the present application, by separately providing a connecting piece to form a first welding part exposed at the welding hole, it is convenient to simplify the structure of the bottom plate to improve the manufacturing efficiency of the bottom plate.

[0015] According to an embodiment of the present application, the connecting piece is a flat plate structure and is fixed on the surface of the bottom plate facing the accommodating cavity.

[0016] According to an embodiment of the present application, the connecting piece is a bent plate structure and includes a first bent section and a second bent section; the first bent section is fixedly connected to the cylinder body, and the second bent section is located between the bottom plate and the electrode assembly and has the first welding part.

[0017] According to an embodiment of the present application, the seal includes an explosion-proof valve, and the welding hole is a through hole; at least part of the edge of the projection of the connecting piece on the bottom plate is located in the area surrounded by the welding hole; and / or the first welding part has a third ventilation hole, and the third ventilation hole communicates the welding hole and the accommodating cavity.

[0018] In the implementation manner of the present application, at least a portion of the edge of the connecting piece is arranged within the area surrounded by the welding hole, or a third air hole is arranged on the first welding portion, so as to realize partial shielding of the welding hole by the connecting piece, thereby ensuring that the shielding area of ​​the welding hole on the connecting piece forms the first welding portion, and at the same time facilitating the alignment of the first welding portion and the second welding portion; furthermore, the connection between the welding hole and the accommodating cavity can be realized, thereby ensuring the reliability of the opening of the sealing piece.

[0019] According to an embodiment of the present application, the electrode assembly includes a winding core and a transition piece that are electrically connected; the transition piece is located between the winding core and the bottom plate and has the second welding portion.

[0020] According to an embodiment of the present application, the adapter has a protrusion facing the bottom plate, and at least a portion of the protrusion forms the second welding portion.

[0021] According to an embodiment of the present application, the adapter is in a disc shape and has a plurality of protrusions distributed at intervals along its circumference, and the second welding portion is formed on one of the plurality of protrusions.

[0022] In the implementation manner of the present application, the protrusion is provided to facilitate the formation of an exhaust passage between the adapter and the base plate, while ensuring the abutment effect between the second welding portion on the protrusion and the first welding portion.

[0023] According to an embodiment of the present application, the protrusion is an arc-shaped structure extending along the circumference of the adapter.

[0024] According to one embodiment of the present application, the energy storage device includes a connector, and the bottom plate has at least one convex bulge facing the accommodating cavity; one of the multiple protrusions is electrically connected to the connector, and each of the remaining protrusions is respectively abutted against one of the convex bulges.

[0025] In the embodiment of the present application, by abutting each of the remaining protrusions against a convex bump, the position stability between the adapter and the base plate is ensured, thereby ensuring the abutment effect between the first welding part and the second welding part, thereby ensuring the reliability of the electrical connection between the first welding part and the second welding part.

[0026] According to an embodiment of the present application, the hole wall of the welding hole has a step surface facing away from the accommodating cavity, and the sealing member is supported on the step surface.

[0027] In the implementation manner of the present application, the step surface is provided so that the sealing member has a certain support height, thereby preventing the welding mark after the first welding portion and the second welding portion are welded to interfere with the assembly of the sealing member.

[0028] According to one aspect of the present application, an electrical device is provided. The electrical device includes the energy storage device described in the above-mentioned aspect, and the energy storage device supplies power to the electrical device.

[0029] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. Brief Description of the Drawings

[0030] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more apparent.

[0031] Figure 1 It is a schematic diagram of an energy storage system shown according to an exemplary embodiment.

[0032] Figure 2 It is a top view structural schematic diagram of an energy storage device shown according to an exemplary embodiment.

[0033] Figure 3 It is Figure 2 The sectional structural schematic diagram of the shown energy storage device along A-A`.

[0034] Figure 4 It is an axonometric top view structural schematic diagram of a bottom plate shown according to an exemplary embodiment.

[0035] Figure 5 It is Figure 4 The sectional structural schematic diagram of the shown bottom plate along Figure 2 The A-A` shown.

[0036] Figure 6 It is Figure 5 The partial enlarged structural schematic diagram of the shown sectional structural schematic diagram.

[0037] Figure 7 It is an axonometric bottom view structural schematic diagram of a bottom plate shown according to an exemplary embodiment.

[0038] Figure 8 It is Figure 7 The sectional structural schematic diagram of the shown bottom plate along Figure 2 The A-A` shown.

[0039] Figure 9 It is Figure 8 The partial enlarged structural schematic diagram of the shown sectional structural schematic diagram.

[0040] Figure 10 It is the sectional structural schematic diagram of another bottom plate along Figure 2 The A-A` shown according to an exemplary embodiment.

[0041] Figure 11Yes Figure 10 The partial enlarged structural schematic diagram of the sectional structure schematic diagram shown in

[0042] Figure 12 The axonometric top view structural schematic diagram of another bottom plate shown according to an exemplary embodiment.

[0043] Figure 13 Yes Figure 12 The top view structural schematic diagram of another bottom plate shown in

[0044] Figure 14 Yes Figure 13 Another sectional structure schematic diagram of the bottom plate shown along Figure 2 The sectional structure schematic diagram of A-A` shown in

[0045] Figure 15 Yes Figure 14 The partial enlarged structural schematic diagram of the sectional structure schematic diagram shown in

[0046] Figure 16 The axonometric top view structural schematic diagram of an adapter shown according to an exemplary embodiment.

[0047] Figure 17 The structural schematic diagram of an electrical equipment shown according to an exemplary embodiment.

[0048] Among them, the reference numerals are explained as follows: 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment; 10, housing; 20, electrode assembly; 30, end cover assembly; 11, bottom plate; 12, cylinder; 13, seal; 14, accommodation cavity; 15, connecting piece; 111, welding hole; 112, first welding part; 113, hole bottom; 114, first ventilation hole; 115, convex; 116, step surface; 117, liquid injection hole; 141, first bending section; 142, second bending section; 21, winding core; 22, adapter; 23, second welding part; 24, second ventilation hole; 25, protrusion; 26, current-carrying hole; 27, groove; 31, cover plate; 32, electrode terminal; 33, current collector. Specific embodiments

[0049] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in various 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 thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. Like reference numerals in the figures denote like or similar structures, and thus their detailed description will be omitted.

[0050] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the utilization rate, it is necessary to store one form of energy in the same form of energy or convert it into another form of energy through a medium or device, and then release it in a specific form of energy based on future applications.

[0051] Currently, green energy mainly includes light energy, wind energy, etc. However, light energy, wind energy, etc. generally have the problems of strong intermittency and large volatility, which will cause the voltage of the green power grid to be unstable (not enough electricity during peak electricity consumption and too much electricity during low electricity consumption). The unstable voltage will damage the power, so the problem of "abandoning wind and light" may be caused due to insufficient electricity demand or insufficient grid acceptance capacity.

[0052] To solve the problems of insufficient electricity demand or insufficient grid acceptance capacity, it is necessary to rely on energy storage devices. That is, through energy storage devices, electrical energy is converted into other forms of energy and stored by physical or chemical means, and then the energy stored in the energy storage device is converted back into electrical energy and released when needed. Simply put, the energy storage device is similar to a large "portable power bank", which stores electrical energy when light energy and wind energy are sufficient and releases the stored electrical energy when needed.

[0053] Currently, the application scenarios of energy storage (i.e., energy storage) are relatively extensive, including power generation side energy storage, grid side energy storage, renewable energy grid connection energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include: (1) Large energy storage containers applied on the grid side, which can be used as high-quality active and reactive power regulation power sources in the grid, realize the load matching of electrical energy in time and space, enhance the consumption capacity of renewable energy, and are of great significance in grid system standby, relieving the power supply pressure of peak loads, and peak shaving and frequency modulation; (2) Medium and small-sized energy storage cabinets applied to industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and household small-sized energy storage boxes applied to household energy storage scenarios on the user side mainly operate in the mode of "peak shaving and valley filling". Due to the large price difference in electricity charges at peak and valley positions according to electricity consumption demands, after users have energy storage devices, in order to reduce costs, they usually charge the energy storage devices (energy storage cabinets / boxes) during the low electricity price period; during the high electricity price period, they release the electricity in the energy storage devices for use, so as to achieve the purpose of saving electricity charges. In addition, in remote areas and areas with high incidences of natural disasters such as earthquakes and hurricanes, the existence of household energy storage devices is equivalent to users providing backup power for themselves and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0054] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store electrical energy or supply electrical energy through the energy storage device.

[0055] Taking the household energy storage scenario on the user side as an example, Figure 1 FIG. shows a schematic diagram of an energy storage system provided by an embodiment of the present application. The energy storage system includes an energy storage device 100 and an electrical energy conversion device 200 (such as a photovoltaic panel), as well as a user load 300 (such as street lights, household appliances, etc.). The electrical energy conversion device 200 is electrically connected to the energy storage device 100, and the energy storage device 100 is electrically connected to the user load 300. The energy storage device 100 is a small-sized energy storage box and can be installed on an outdoor wall in a wall-mounted manner. Specifically, the electrical energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply it to the user load 300 for use during peak electricity prices, or supply it to the user load 300 for use when the power grid is powered off / out of power.

[0056] Among them, the energy storage device 100 can be, but is not limited to, a single battery (secondary battery), as well as a battery module, a battery pack, a battery system, etc. composed of single batteries. The battery cell can be a lithium-ion battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, a magnesium-ion battery, etc., and the battery cell can be in the shape of a cylinder, a flat body, a cuboid, etc. The embodiment of the present application does not make any limitations in this regard. Specifically, the battery cell can realize the charging and discharging process by using the chemical reaction or change of the energy storage medium (chemical element). Simply put, the electrical energy generated by light energy and wind energy is stored in the battery cell through the chemical reaction or change of the energy storage medium, and when the use of external electrical energy reaches a peak, the electrical energy stored in the battery cell is released through the chemical reaction or change of the energy storage medium for use, or transferred for use.

[0057] In some embodiments, such as Figure 2 and Figure 3As shown in the figure, the energy storage device 100 includes: a housing 10, an electrode assembly 20, and an end cap assembly 30. The housing 10 encloses a receiving cavity 14 with an opening. The electrode assembly 20 is disposed in the receiving cavity 14, and the end cap assembly 30 seals the opening of the receiving cavity 14.

[0058] Among them, as Figure 3 shown, the housing 10 includes a bottom plate 11 and a cylindrical body 12. The bottom plate 11 is connected to the cylindrical body 12 to enclose a receiving cavity 14 with one end open. In addition, the bottom plate 11 and the cylindrical body 12 can form the housing 10 by integral molding, or can form the housing 10 by fixing means such as welding.

[0059] Among them, as Figure 3 shown, the electrode assembly 20 includes a wound core 21. The wound core 21 is made by winding a first pole piece, a second pole piece, and a separator stacked together, and has a first pole tab (formed by the first pole piece) facing the bottom plate 11 and a second pole tab (formed by the second pole piece) facing the end cap assembly 30. The polarities of the first pole piece and the second pole piece are opposite, and the separator is located between the first pole piece and the second pole piece. The first pole tab (such as the positive pole tab) of the wound core 21 is electrically connected to the bottom plate 11 to output one electrode terminal (such as the positive electrode output terminal) of the energy storage device 100 through the bottom plate 11. In addition, as Figure 3 shown, the electrode assembly 20 further includes an adapter 22 (such as a positive adapter) electrically connected to the wound core 21. The adapter 22 is located between the wound core 21 and the bottom plate 11 and is electrically connected to the bottom plate 11 to increase the current-carrying capacity between the wound core 21 and the bottom plate 11 and improve the electrical safety of the energy storage device 100.

[0060] Among them, as Figure 3 shown, the end cap assembly 30 includes a cover plate 31 and an electrode terminal 32. The electrode terminal 32 passes through the cover plate 31, and the electrode terminal 32 is electrically insulated from the cover plate 31 (for specific connection, reference can be made to related technologies). One end of the electrode terminal 32 is electrically connected to the wound core 21 (i.e., the second pole tab, such as the negative pole tab), and the other end is exposed to serve as another electrode output terminal (such as the negative electrode output terminal of the energy storage device 100). In addition, an explosion-proof valve can be provided on the cover plate 31 to burst when the pressure in the receiving cavity 14 is greater than the opening pressure of the explosion-proof valve and discharge the gas in the receiving cavity 14 to improve the safety of using the energy storage device 100. Furthermore, as Figure 3 shown, the end cap assembly 30 can further include a current collector 33 (such as a negative current collector 33). The current collector 33 is located between the electrode terminal 32 and the electrode assembly 20 (wound core 21) and is respectively connected to the electrode terminal 32 and the wound core 21, thereby ensuring the current-carrying capacity between the electrode terminal 32 and the wound core 21 and improving the electrical safety of the energy storage device 100.

[0061] In the related art, the bottom of the housing 10 (i.e., the bottom plate 11) has a through mounting hole, the surface of the adapter 22 facing away from the core 21 has a convex bulge, and a liquid injection hole 117 passing through the convex bulge; when the core 21 is inserted into the housing, the convex bulge on the adapter 22 extends into the mounting hole, and the convex bulge and the edge of the mounting hole are fixedly connected by seam welding. Furthermore, liquid can be injected through the liquid injection hole 117 on the convex bulge, and after the liquid injection is completed, it is sealed with a sealing nail.

[0062] After careful research, the inventor found that when performing seal welding on the edge of the convex bulge and the mounting hole, since the liquid injection hole 117 is formed on the convex bulge, the position of the liquid injection hole 117 is relatively close to the welding position. Thus, the heat generated by welding is conducted to the hole wall of the liquid injection hole 117, causing the aperture of the liquid injection hole 117 to become larger, resulting in insufficient interference when the sealing nail seals the liquid injection hole 117, reducing the sealing yield of the liquid injection hole 117, and further reducing the sealing reliability of the energy storage device 100.

[0063] The present application provides an energy storage device 100. For the housing 10 and the electrode assembly 20 included in the energy storage device 100, as Figure 2 and Figure 4 shown, in addition to including the bottom plate 11 and the cylinder 12, the housing 10 further includes a sealing member 13. The bottom plate 11 has a welding hole 111 and a first welding portion 112 exposed at the welding hole 111. The sealing member 13 is sealed and limited within the welding hole 111; the electrode assembly 20 has a second welding portion 23, and the second welding portion 23 is electrically connected to the first welding portion 112.

[0064] In this way, through the welding hole 111 separately provided on the bottom plate 11, the welding of the first welding portion 112 and the second welding portion 23 can be realized, that is, the connection between the bottom plate 11 and the electrode assembly 20 is realized, so as to ensure the sealing reliability of the energy storage device 100, and further improve the production yield of the energy storage device 100.

[0065] Among them, the above-mentioned electrical connection, as well as the electrical connection involved in the following of the present application, can be welding, conductive agent bonding, etc.

[0066] Among them, the welding hole 111 on the bottom plate 11 is mainly a hole for welding the first welding portion 112 and the second welding portion 23. At this time, the sealing member 13 includes a sealing patch to realize the sealing of the welding hole 111 after the welding of the first welding portion 112 and the second welding portion 23. In addition, the welding hole 111 on the bottom plate 11 can be reused as the liquid injection hole 117. At this time, the sealing member 13 at least includes a sealing nail to seal the welding hole 111 after welding and liquid injection; of course, the welding hole 111 on the bottom plate 11 can also be reused as an explosion-proof hole. At this time, the sealing member 13 at least includes an explosion-proof valve to realize the installation of the explosion-proof valve in the welding hole 111 after welding.

[0067] When the welding hole 111 is reused as an explosion-proof hole, the first welding part 112 does not completely block the welding hole 111 to ensure the connection between the welding hole 111 and the accommodation cavity 14. Thus, when the pressure in the accommodation cavity 14 is greater than the opening pressure of the seal 13 (explosion-proof valve), the explosion-proof valve is caused to burst and the gas in the accommodation cavity 14 is discharged outside. For the case where the first welding part 112 does not completely block the welding hole 111, please refer to the following description for details. In addition, when the welding hole 111 is reused as an explosion-proof hole, or when the welding hole 111 is only used for welding, as Figure 1 shown, a liquid injection hole 117 is provided on the bottom plate 11, so as to facilitate increasing the distance between the welding hole 111 and the liquid injection hole 117, and avoid the influence of the welding heat during welding on the liquid injection hole 117.

[0068] Combined with the situation that the electrode assembly 20 described above includes the adapter 22, for the case where the welding hole 111 is reused as the liquid injection hole 117, or when the bottom plate 11 is provided with the liquid injection hole 117, as Figure 4 shown, the adapter 22 also has a current-carrying hole 26 to ensure that the electrolyte injected along the liquid injection hole 117 flows into the accommodation cavity 14 through the current-carrying hole 26 on the adapter 22, ensuring the wetting of the wound core 21.

[0069] In some embodiments, as Figure 4 or Figure 5 shown, the hole wall of the welding hole 111 has a stepped surface 116 facing away from the accommodation cavity 14, and the seal 13 is supported on the stepped surface 116 (i.e., the tread surface on the hole wall of the welding hole 111).

[0070] In this way, through the support of the stepped surface 116 for the seal 13, the seal 13 has a certain support height, thus avoiding the welding scar after the welding of the first welding part 112 and the second welding part 23 from interfering with the assembly of the seal 13; in addition, it is convenient to realize the positioning of the seal 13 in the welding hole 111, and then the edge of the seal 13 can be welded to the edge of the hole wall of the welding hole 111 (i.e., the kick surface on the hole wall of the welding hole 111) to realize the sealing limit of the seal 13 in the welding hole 111. Moreover, when the welding hole 111 is reused as an explosion-proof hole, based on the setting of the stepped surface 116, a gap can be formed between the first welding part 112 and the seal 13 to form an air flow channel, ensuring the reliability of the opening of the seal 13 (explosion-proof valve).

[0071] Among them, the stepped surface 116 of the welding hole 111 is an annular structure, and the circumferential edge of the seal 13 is supported on the stepped surface 116 of the welding hole 111 to ensure the limiting area of the seal 13 in the welding hole 111 and the reliability of the limiting seal of the seal 13 in the welding hole 111.

[0072] In some embodiments, as Figure 5 andFigure 6 As shown, the welding hole 111 is a blind hole with the orifice facing away from the accommodating cavity 14, and a first welding portion 112 is formed at the bottom 113 of the welding hole 111.

[0073] In this way, an integrated first welding portion 112 can be formed at the welding hole 111, so as to simplify the structure of the bottom plate 11, thereby simplifying the structure of the energy storage device 100 and improving the assembly efficiency; when fixing the bottom plate 11 and the cylinder 12 later, the first welding portion 112 at the welding hole 111 is pre-aligned with the second welding portion 23 to ensure the reliability of the electrical connection (welding) between the first welding portion 112 and the second welding portion 23.

[0074] In some embodiments, the seal 13 includes an explosion-proof valve, such as Figure 4 、 Figure 5 and Figure 6 As shown, the bottom 113 of the welding hole 111 has a first ventilation hole 114 communicating with the accommodating cavity 14.

[0075] In this way, through the arrangement of the first ventilation hole 114 on the bottom 113, it is convenient to improve the alignment efficiency of the first welding portion 112 and the second welding portion 23 and the reliability of the welding between the first welding portion 112 and the second welding portion 23; it can also realize the gas flow in the accommodating cavity 14 towards the welding hole 111 based on the communication between the first ventilation hole 114 and the accommodating cavity 14, so as to burst the seal 13 to ensure gas discharge when the gas pressure in the accommodating cavity 14 is greater than the opening pressure of the seal 13 (explosion-proof valve), thereby realizing the reuse of the welding hole 111 and simplifying the structure of the energy storage device 100.

[0076] Among them, in combination with the case where the electrode assembly 20 described above includes an adapter, the adapter 22 has a second ventilation hole 24, and the second ventilation hole 24 communicates the accommodating cavity 14 and the first ventilation hole 114; when the welding hole 111 is reused as an explosion-proof hole, the shape of the welding hole 111 matches the contour shape of the explosion-proof valve to facilitate the assembly of the explosion-proof valve in the welding hole 111. Exemplarily, the welding hole 111 is an oblong hole. At this time, the bottom 113 of the welding hole 111 may have two first ventilation holes 114 extending along the length direction, and the two first ventilation holes 114 are located on both sides in the width direction.

[0077] In some other embodiments, as Figure 7 shown, the energy storage device 100 includes a connecting member 15, the connecting member 15 is located in the accommodating cavity 14 and is electrically connected to the housing 10, and the connecting member 15 has a first welding portion 112.

[0078] In this way, a first welding portion 112 exposed at the welding hole 111 is formed by the separately provided connecting member 15, which facilitates the simplification of the structure of the bottom plate 11 to improve the manufacturing efficiency of the bottom plate 11; in addition, through the electrical connection between the connecting member 15 and the housing 10, after the first welding portion 112 is electrically connected to the second welding portion 23, the energized effect of the housing 10 is achieved.

[0079] Among them, the connecting member 15 can be electrically connected to the bottom plate 11 included in the housing 10 or to the cylindrical body 12 included in the housing 10 within the accommodation cavity 14.

[0080] Taking the electrical connection between the connecting member 15 and the bottom plate 11 as an example, as Figure 8 and Figure 9 shown, the connecting member 15 is a flat plate-like structure and is fixed on the surface of the bottom plate 11 facing the accommodation cavity 14.

[0081] Among them, the connecting member 15 can be electrically connected to the surface of the bottom plate 11 (the surface for facing the adapter 22) in advance, while ensuring that the connecting member 15 has a first welding portion 112 exposed at the welding hole 111; then, when the bottom plate 11 and the cylindrical body 12 are fixed, the alignment between the first welding portion 112 on the connecting member 15 and the second welding portion 23 on the electrode assembly 20 is ensured, thereby ensuring the reliability of the electrical connection between the first welding portion 112 and the second welding portion 23.

[0082] Taking the electrical connection between the connecting member 15 and the cylindrical body 12 as an example, as Figure 10 and Figure 11 shown, the connecting member 15 is a bent plate-like structure and includes a first bent section 141 and a second bent section 142; the first bent section 141 is fixedly connected to the cylindrical body 12, and the second bent section 142 is located between the bottom plate 11 and the electrode assembly 20 and has a first welding portion 112.

[0083] Among them, the second bent section 142 can be electrically connected to the bottom plate 11 to ensure that the bottom plate 11 serves as an electrode output terminal of the energy storage device 100, or the second bent section 142 is not connected to the bottom plate 11, but the bottom plate 11 is electrically connected to the cylindrical body 12 to ensure that the bottom plate 11 serves as an electrode output terminal of the energy storage device 100.

[0084] Taking the electrical connection between the second bending section 142 and the bottom plate 11 as an example, for the flat connecting piece 15, the bending positions can be preset first, and then the first bending section 141 and the second bending section 142 are electrically connected to the inner wall of the cylinder 12 and the surface of the bottom plate 11 (the surface facing the adapter 22) respectively, while ensuring that the second bending section 142 has a first welding part 112 exposed at the welding hole 111. Then, when fixing the bottom plate 11 and the cylinder 12, the connecting piece 15 is bent based on the preset bending position first, so that the bottom plate 11 and the port of the cylinder 12 are aligned. At the same time, the first welding part 112 on the second bending section 142 is aligned with the second welding part 23 on the electrode assembly 20, ensuring the reliability of the fixation of the bottom plate 11 and the cylinder 12, and ensuring the reliability of the electrical connection between the first welding part 112 and the second welding part 23.

[0085] Taking the case where the second bending section 142 is not connected to the bottom plate 11 as an example, for the flat connecting piece 15, the bending positions can be preset first, and then the first bending section 141 is electrically connected to the inner wall of the cylinder 12, and the connecting piece 15 is bent based on the preset bending position, so that there is an overlapping area between the second bending section 142 and the second welding part 23 on the electrode assembly 20. Then, when electrically connecting the bottom plate 11 and the cylinder 12, the overlapping area between the second bending section 142 and the second welding part 23 is exposed at the welding hole 111 on the bottom plate 11. Furthermore, after completing the electrical connection between the bottom plate 11 and the cylinder 12, the electrical connection between the second bending section 142 (i.e., the first welding part 112) and the second welding part 23 is completed at the welding hole 111.

[0086] For the energy storage device 100 described above, which includes a connecting piece 15 and forms a first welding part 112 through the connecting piece 15, the connecting piece 15 may completely block the welding hole 111, or the connecting piece 15 may not completely block the welding hole 111. Next, taking the sealing member 13 including an explosion-proof valve and the connecting piece 15 not completely blocking the welding hole 111 as an example, a detailed explanation is given.

[0087] In some embodiments, as Figure 7 shown, the welding hole 111 is a through hole, and at least part of the edge of the orthographic projection of the connecting piece 15 on the bottom plate 11 is located within the area surrounded by the welding hole 111.

[0088] In this way, by setting at least part of the edge of the connecting piece 15 within the area surrounded by the welding hole 111, partial shielding of the welding hole 111 by the connecting piece 15 is achieved, so as to ensure that the shielding area of the connecting piece 15 on the welding hole 111 forms a first welding part 112, and at the same time, it is convenient to align the first welding part 112 and the second welding part 23. Moreover, the communication between the welding hole 111 and the accommodation cavity 14 can be realized to ensure the reliability of the opening of the sealing member 13.

[0089] Among them, in combination with the adapter 22 described above, the adapter 22 has a second vent hole 24 communicating with the welding hole 111 to ensure the communication between the welding hole 111 and the accommodation cavity 14; when the welding hole 111 is reused as an explosion-proof hole, the shape of the welding hole 111 matches the contour shape of the explosion-proof valve to facilitate the assembly of the explosion-proof valve in the welding hole 111. By way of example, as Figure 7 shown, the welding hole 111 is an oblong hole and the connecting member 15 is a long strip structure; at this time, it can be as Figure 7 shown, the length direction of the welding hole 111 is parallel to the length direction of the connecting member 15, and the width of the welding hole 111 is greater than the width of the connecting member 15, so that after the connecting member 15 is centered at the welding hole 111 along its own width direction, at least part of the two long sides of the connecting member 15 is located within the area surrounded by the welding hole 111; of course, it can also be that the length direction of the welding hole 111 is perpendicular to the length direction of the connecting member 15, and the length of the welding hole 111 is greater than the width of the connecting member 15, so that after the connecting member 15 is centered at the welding hole 111 along its own width direction, at least part of the two long sides of the connecting member 15 is located within the area surrounded by the welding hole 111.

[0090] It should be noted that for the case where the connecting member 15 does not completely block the welding hole 111, in addition to the above-mentioned cases, it can also be that the first welding portion 112 of the connecting member 15 has a third vent hole, and the third vent hole communicates the welding hole 111 and the accommodation cavity 14 to ensure the reliability of the gas discharge from the accommodation cavity 14. Further, when the adapter 22 is formed with a second welding portion 23, in combination with the above description, the second welding portion 23 has a second vent hole 24, and the second vent hole 24 communicates with the third vent hole to realize the communication between the accommodation cavity 14 and the welding hole 111 and ensure the reliability of the gas discharge from the accommodation cavity 14.

[0091] In the embodiment of the present application, in combination with the case where the electrode assembly 20 described above includes the adapter 22, the adapter 22 may have a second welding portion 23. At this time, the adapter 22 may have a planar area facing the bottom plate 11, and the second welding portion 23 is formed in the planar area, or the adapter 22 may have a convex area facing the bottom plate 11, and the second welding portion 23 is formed in the convex area.

[0092] Among them, when the second welding portion 23 is formed in the planar area on the adapter 22, it is convenient to form a liquid injection channel and an exhaust channel between the adapter 22 and the bottom plate 11 through the interval of the connecting member 15; when the adapter 22 has a convex area facing the bottom plate 11, it is convenient to form a liquid injection channel and an exhaust channel between the adapter 22 and the bottom plate 11 through the interval of the convex area or through the interval of the convex area and the connecting member 15. Next, a detailed explanation of the convex area of the adapter 22 will be given.

[0093] In some embodiments, such as Figure 12 and Figure 13 shown, the adapter 22 has a protrusion 25 facing the bottom plate 11, and at least a part of the protrusion 25 forms a second welding portion 23.

[0094] In this way, by providing the protrusion 25, it is convenient to ensure the abutting effect between the second welding portion 23 and the first welding portion 112, thereby ensuring the reliability of the electrical connection between the first welding portion 112 and the second welding portion 23.

[0095] In some embodiments, such as Figure 12 shown, the adapter 22 is in a disc shape and has a plurality of protrusions 25 distributed at intervals along its circumferential direction. A second welding portion 23 is formed on one of the plurality of protrusions 25.

[0096] In this way, by providing the plurality of protrusions 25, it is convenient to form the second welding portion 23 on any one of the plurality of protrusions 25, thereby ensuring the reliability of the alignment between the first welding portion 112 and the second welding portion 23.

[0097] Among them, the protrusion 25 can be a linear structure extending along the radial direction of the adapter 22, or an arc-shaped structure extending along the circumferential direction of the adapter 22. When the protrusion 25 is an arc-shaped structure, it is convenient to increase the probability of the protrusion 25 being exposed at the welding hole 111, and further convenient to simplify the alignment setting between the first welding and the second welding portion 23.

[0098] In some embodiments, in combination with the case where the energy storage device 100 includes the connecting member 15 as described above, such as Figure 14 and Figure 15 shown, the bottom plate 11 has at least one convex hull 115 facing the accommodation cavity 14; one of the plurality of protrusions 25 is electrically connected to the connecting member 15, and each of the remaining protrusions 25 abuts against one convex hull 115 respectively.

[0099] In this way, through the abutting between each of the remaining protrusions 25 and one convex hull 115 respectively, it is convenient to ensure the position stability between the adapter 22 and the bottom plate 11, and further ensure the abutting effect between the first welding portion 112 and the second welding portion 23, so as to ensure the reliability of the electrical connection between the first welding portion 112 and the second welding portion 23.

[0100] In some embodiments, such as Figure 16 shown, the adapter 22 further has a plurality of grooves 27 facing the bottom plate 11. In this way, through the provision of the grooves 27, it is convenient to improve the flatness when the adapter 22 is electrically connected to the core 21, thereby improving the reliability of the electrical connection between the adapter 22 and the core 21.

[0101] Exemplarily, such as Figure 16As shown, the adapter 22 is disc-shaped and has a plurality of grooves 27 extending radially and spaced circumferentially. Considering the case where the adapter 22 has a plurality of protrusions 25 described above, it can be as follows Figure 16 As shown, in the circumferential direction of the adapter 22, the protrusions 25 and the grooves 27 are alternately distributed.

[0102] An embodiment of the present application also provides an electrical device 400, which can be a user energy storage cabinet, an energy storage container, etc. As Figure 17 shown, the electrical device 400 includes the energy storage device 100 described in the above embodiment, and the energy storage device 100 supplies power to the electrical device 400. Thus, as described above, during the use of the electrical device 400 of the present application, the safety of the electrical device 400 during use can be effectively ensured, and the safety hazard caused by the leakage of the energy storage device 100 can be reduced.

[0103] In the embodiments of the present application, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance; the term "plurality" means two or more, unless otherwise clearly defined. Terms such as "installation", "connection", "connection", "fixation" should all be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "connection" 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 embodiments of the present application can be understood according to specific circumstances.

[0104] In the description of the embodiments of the present application, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application 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, cannot be construed as a limitation to the embodiments of the present application.

[0105] In the description of this specification, the descriptions of terms such as "one embodiment", "some embodiments", "specific embodiments", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or instance. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] The above are only the preferred embodiments of the implementation manner of the present application, and are not used to limit the implementation manner of the present application. For those skilled in the art, various changes and modifications can be made to the implementation manner of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the implementation manner of the present application shall be included within the protection scope of the implementation manner of the present application.

Claims

1. An energy storage device, characterized in that: include: A shell (10) comprising a bottom plate (11), a cylinder (12) and a sealing member (13), wherein the bottom plate (11) is connected to the cylinder (12) and forms a receiving cavity (14) with one end open, the bottom plate (11) having a welding hole (111) and a first welding portion (112) exposed at the welding hole (111), and the sealing member (13) is sealed and limited in position within the welding hole (111); An electrode assembly (20) is accommodated in the accommodation cavity (14) and has a second welding portion (23), wherein the second welding portion (23) is electrically connected to the first welding portion (112); An end cap assembly (30) seals the opening of the accommodating cavity (14) and is electrically connected to the electrode assembly (20).

2. The energy storage device according to claim 1, characterized in that The welding hole (111) is a blind hole with its opening facing away from the accommodating cavity (14), and the first welding portion (112) is formed at the bottom (113) of the welding hole (111).

3. The energy storage device according to claim 2, characterized in that: The sealing member (13) comprises an explosion-proof valve, and the bottom (113) of the welding hole (111) comprises a first air-permeable hole (114) communicating with the accommodating cavity (14).

4. The energy storage device according to claim 1, characterized in that: The energy storage device (100) comprises a connecting piece (15), the connecting piece (15) is located in the accommodating cavity (14) and is electrically connected to the housing (10), and the connecting piece (15) has the first welding portion (112).

5. The energy storage device according to claim 4, characterized in that: The connecting piece (15) is a flat plate-shaped structure and is fixed on the surface of the bottom plate (11) facing the accommodating cavity (14).

6. The energy storage device according to claim 4, characterized in that: The connecting piece (15) is a bent plate-shaped structure, and comprises a first bent section (141) and a second bent section (142); The first bending section (141) is fixedly connected to the barrel (12); the second bending section (142) is located between the bottom plate (11) and the electrode assembly (20) and has the first welding portion (112).

7. The energy storage device according to any one of claims 4 to 6, characterized in that: The sealing member (13) comprises an explosion-proof valve, and the welding hole (111) is a through hole; At least part of the edge of the orthographic projection of the connecting member (15) on the bottom plate (11) is located within the area surrounded by the welding hole (111); or the first welding portion (112) has a third air vent, the third air vent communicating with the welding hole (111) and the accommodating cavity (14).

8. The energy storage device according to any one of claims 1 to 6, characterized in that: The electrode assembly (20) comprises a winding core (21) and a transition piece (22) which are electrically connected; The adapter (22) is located between the winding core (21) and the bottom plate (11), and has the second welding portion (23).

9. The energy storage device according to claim 8, characterized in that: The adapter (22) has a protrusion (25) facing the bottom plate (11), and at least a portion of the protrusion (25) forms the second welding portion (23).

10. The energy storage device according to claim 9, characterized in that: The adapter (22) is disc-shaped and has a plurality of protrusions (25) distributed at intervals along its circumference, and the second welding portion (23) is formed on one of the plurality of protrusions (25).

11. The energy storage device according to claim 10, characterized in that: The protrusion (25) is an arc-shaped structure extending along the circumference of the adapter (22).

12. The energy storage device according to claim 10, characterized in that: The energy storage device (100) comprises a connecting piece (15), and the bottom plate (11) has at least one convex bump (115) facing the accommodating cavity (14); One of the plurality of protrusions (25) is electrically connected to the connecting member (15), and each of the remaining protrusions (25) is respectively in contact with one of the convex humps (115).

13. The energy storage device according to any one of claims 1 to 6, characterized in that: The hole wall of the welding hole (111) has a step surface (116) facing away from the accommodating cavity (14), and the sealing element (13) is supported on the step surface (116).

14. An electrical device, characterized in that: The electrical equipment (400) comprises the energy storage device (100) according to any one of claims 1 to 13 above, and the energy storage device (100) supplies power to the electrical equipment (400).

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