Current collecting disc, energy storage device and electric equipment

Abstract

The utility model discloses a collector plate, an energy storage device and electric equipment, and relates to the technical field of energy storage. The collector plate comprises a first connecting part, a second connecting part and a third connecting part, wherein the first connecting part and the second connecting part are respectively connected to two opposite ends of the third connecting part; the third connecting part is provided with a bent position, the distance between the bent position and the center point of the first connecting part is equal to the distance between the bent position and the center point of the second connecting part, and the bent position is used for bending the collector plate into a U shape with the first connecting part and the second connecting part opposite to each other. In the embodiment of the invention, the distance from the bending position to the central point of the first connecting part is set to be equal to the distance from the bending position to the central point of the second connecting part, so that the accuracy of alignment of the central point of the first connecting part and the central point of the second connecting part is ensured through one-time bending of the current collecting disc along the bending position; and therefore, the alignment effect of the end cover assembly and the electrode assembly of the energy storage device can be ensured, and the assembly yield of the energy storage device can be improved.

Description

Technical Field

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

[0002] Rechargeable batteries, also known as rechargeable batteries or storage batteries, are batteries that can be recharged after discharge to reactivate their active materials and continue to be used. Their recyclable nature has made them a key source of power for electrical devices. As demand for rechargeable batteries grows, so too are the demands placed on their performance, particularly their lifespan.

[0003] In related technologies, secondary batteries typically consist of an end cap assembly, an electrode assembly, and a casing. The actual production process involves separately manufacturing the end cap assembly, electrode assembly, and casing, then placing the electrode assembly inside the casing. The end cap assembly then seals the casing with welding to form the basic structure of the secondary battery.

[0004] The end cap assembly includes a current collector and an electrode terminal. One end of the current collector is connected to the electrode terminal, and the other end is connected to the electrode assembly's tab. The current collector must be bent twice before the end cap assembly can close the opening in the housing. Bending the current collector can easily cause misalignment between the end cap assembly and the electrode assembly, affecting the assembly yield of the secondary battery. Summary of the Invention

[0005] A main purpose of the present application is to provide a current collecting plate, an energy storage device and an electrical equipment that can improve the centering effect.

[0006] To achieve the above application objectives, this application adopts the following technical solutions:

[0007] According to one aspect of the present application, a current collecting plate is provided, comprising: a first connecting portion, a second connecting portion and a third connecting portion, wherein the first connecting portion and the second connecting portion are respectively connected to two opposite ends of the third connecting portion; the third connecting portion has a bending position, the distance from the bending position to the center point of the first connecting portion is equal to the distance to the center point of the second connecting portion, and the bending position is used to bend the current collecting plate into a U-shape relative to the first connecting portion and the second connecting portion.

[0008] In the embodiment of the present application, the distance from the bending position to the center point of the first connection part is set to be equal to the distance from the bending position to the center point of the second connection part, so that the accuracy of the alignment of the center point of the first connection part and the center point of the second connection part is ensured by a single bending of the collecting plate along the bending position, thereby facilitating the alignment effect of the end cover assembly and the electrode assembly of the energy storage device and improving the assembly yield of the energy storage device.

[0009] According to one embodiment of the present application, the surface of the third connecting portion has a first group of reinforcing ribs and a second group of reinforcing ribs, and the first group of reinforcing ribs and the second group of reinforcing ribs are respectively located on both sides of the bending position.

[0010] In the embodiment of the present application, the first and second groups of reinforcing ribs are provided to limit the bending position of the third connection portion when bending along the bending position, thereby ensuring the bending effect of the third connection portion and further ensuring the bending effect of the collecting plate.

[0011] According to one embodiment of the present application, the first group of reinforcing ribs and the second group of reinforcing ribs are both mesh structures.

[0012] According to an embodiment of the present application, the bending position has bending grooves located on both side edges of the third connecting portion.

[0013] In the embodiment of the present application, the bending grooves at both ends of the bending position facilitate marking of the bending position, thereby facilitating improving the bending efficiency of the collecting plate while ensuring the bending effect; in addition, based on the setting of the bending grooves, it is convenient to reduce the resistance of the collecting plate when bending.

[0014] According to one embodiment of the present application, a connection between the first connection portion or the second connection portion and the third connection portion has a bending notch located at an edge.

[0015] In the embodiment of the present application, by providing a bending notch at the edge of the connection between the first connection portion or the second connection portion and the third connection portion, it is convenient to mark the pre-bending position, thereby facilitating the improvement of the pre-bending efficiency of the collecting plate.

[0016] According to one embodiment of the present application, the first connecting portion has a first welding area and a second welding area symmetrically distributed along the length direction of the bending position; the first welding area and the second welding area are both V-shaped, and the V-shaped openings of the first welding area and the second welding area are both facing away from the center point of the first connecting portion.

[0017] In the embodiment of the present application, the first connecting portion and the electrode assembly are welded at two positions near the center area and four positions near the edge area through the first welding area and the second welding area, thereby ensuring the welding area between the first connecting portion and the electrode assembly and ensuring the stability of the welding.

[0018] According to an embodiment of the present application, the first welding area and the second welding area both protrude from one side surface of the first connecting portion in the thickness direction.

[0019] In the embodiment of the present application, the protrusions of the first welding area and the second welding area are set to facilitate improving the flatness of the first connecting portion on the first side surface, thereby improving the tightness of contact between the first welding area, the second welding area and the electrode tab on the electrode assembly, avoiding the occurrence of cold welds during welding.

[0020] According to one embodiment of the present application, the thickness of the first connecting portion is less than or equal to 0.3 mm.

[0021] According to one embodiment of the present application, the second connecting portion has a first fixing area and a second fixing area symmetrically distributed along the length direction of the bending position.

[0022] In the embodiment of the present application, the first fixing area and the second fixing area on the second connecting portion are respectively connected to the two electrode terminals on the end cover assembly, thereby facilitating the assembly of the energy storage device with dual electrode terminals.

[0023] According to one embodiment of the present application, an edge of the second connecting portion away from the first connecting portion has an avoidance notch.

[0024] In the embodiment of the present application, an avoidance gap is provided on the edge of the second connecting portion of the collecting plate to avoid the area corresponding to the explosion-proof valve on the end cover assembly, thereby ensuring normal explosion of the explosion-proof valve.

[0025] According to one aspect of the present application, an energy storage device is provided, comprising: a shell including a accommodating cavity with an opening; an electrode assembly accommodated in the accommodating cavity; an end cover assembly sealing the opening of the accommodating cavity; and the current collecting plate described in the above aspect, wherein the current collecting plate is U-shaped, and the first connecting portion is connected to the electrode assembly, and the second connecting portion is connected to the end cover assembly.

[0026] According to one aspect of the present application, an electric device is provided, which includes the energy storage device described in the above aspect, and the energy storage device supplies power to the electric device.

[0027] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features and advantages of the present application will become more apparent by describing in detail example embodiments thereof with reference to the accompanying drawings.

[0029] Figure 1 is a schematic diagram showing an energy storage system according to an exemplary embodiment.

[0030] Figure 2FIG1 is a schematic diagram of the axial structure of an energy storage device according to an exemplary embodiment.

[0031] Figure 3 yes Figure 2 The cross-sectional structural diagram of the energy storage device along line AA is shown.

[0032] Figure 4 The figure is a schematic diagram of an exploded structure of an end cover assembly and a current collecting plate according to an exemplary embodiment.

[0033] Figure 5 FIG1 is a schematic structural diagram of a current collecting plate before bending according to an exemplary embodiment.

[0034] Figure 6 FIG1 is a schematic diagram showing the structure of a current collecting plate after bending according to an exemplary embodiment.

[0035] Figure 7 FIG1 is a schematic structural diagram of another current collecting plate before bending according to an exemplary embodiment.

[0036] Figure 8 FIG1 is a schematic diagram showing the structure of a current collecting plate after bending according to an exemplary embodiment.

[0037] Figure 9 FIG1 is a schematic structural diagram of another current collecting plate before bending according to an exemplary embodiment.

[0038] Figure 10 FIG1 is a schematic diagram of an assembly structure of a current collecting plate before bending according to an exemplary embodiment.

[0039] Figure 11 FIG. 1 is a schematic structural diagram of another current collecting plate before bending according to an exemplary embodiment.

[0040] Figure 12 It is a schematic structural diagram of an electric device according to an exemplary embodiment.

[0041] The description of the accompanying drawings is as follows:

[0042] 100, energy storage device; 200, electric energy conversion device; 300, user load; 400, electrical equipment;

[0043] 10. Housing; 20. Electrode assembly; 30. End cap assembly; 40. Current collecting plate;

[0044] 11. Accommodating cavity;

[0045] 31. End cap body; 32. Electrode terminal; 33. Explosion-proof valve;

[0046] 41. First connecting portion; 42. Second connecting portion; 43. Third connecting portion;

[0047] 411, center hole; 412, first welding area; 413, second welding area; 414, first groove; 415, second groove; 416, guide groove;

[0048] 421, first fixed area; 422, second fixed area; 423, avoidance gap;

[0049] 431. Bending position; 432. Bending groove; 433. Bending notch; 434. First set of reinforcing ribs; 435. Second set of reinforcing ribs. DETAILED DESCRIPTION

[0050] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the example embodiments to those skilled in the art. Like reference numerals in the figures represent like or similar structures, and thus their detailed description will be omitted.

[0051] Since the energy people need is highly temporal and spatial, in order to make rational use of energy and improve utilization rate, it is necessary to use a medium or equipment to store one form of energy in the same energy form, or convert it into another form of energy, and then release it in a specific energy form based on future applications.

[0052] At present, green energy mainly includes solar energy, wind energy, etc., which 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 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.

[0053] To address the issue of insufficient electricity demand or insufficient grid capacity, energy storage devices are essential. These devices convert electrical energy into other forms of energy through physical or chemical means, storing it. When needed, the stored energy is converted back into electricity and released. Simply put, an energy storage device acts like a large "power bank," storing electricity when there's sufficient solar or wind energy and releasing it when needed.

[0054] Currently, 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:

[0055] (1) Large energy storage containers used in grid-side energy storage scenarios can serve as high-quality active and reactive power regulation power sources in the grid, achieving load matching of electricity in time and space, enhancing the ability to absorb renewable energy, and are of great significance in grid system backup, alleviating peak load power supply pressure, and peak and frequency regulation;

[0056] (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 prices at peak and valley locations according to electricity demand, after users have energy storage equipment, in order to reduce costs, they usually charge the energy storage device (energy storage cabinet / box) during the low electricity price period; during the peak electricity price period, the electricity in the energy storage device is discharged for use to achieve the purpose of saving electricity bills. In addition, in remote areas and areas with high incidence of 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.

[0057] An embodiment of the present application provides an energy storage system, which includes an energy storage device to store or supply electric energy through the energy storage device.

[0058] Taking the household energy storage scenario in user-side energy storage as an example, Figure 1 The schematic diagram of an energy storage system provided by an embodiment of the present application is shown. The energy storage system includes an energy storage device 100 and an electric energy conversion device 200 (such as a photovoltaic panel), and a user load 300 (such as a street lamp, household appliance, etc.). The electric 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 energy storage box that can be mounted on an outdoor wall by wall-mounting. Specifically, the electric energy conversion device 200 can convert solar energy into electrical energy and store it through the energy storage device 100, and then supply the user load 300 for use when the electricity price is peak, or supply the user load 300 for use when the power grid is outage / power outage.

[0059] Among them, the energy storage device 100 can be but is not limited to a single cell (secondary battery), and a battery module, battery pack, battery system, etc. composed of single cells. 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 cylindrical, flat, rectangular, etc., and the embodiment of the present application does not limit this. Specifically, the battery cell can utilize the chemical reaction or change of the energy storage medium (chemical element) to realize the charging and discharging process. Simply put, the electric 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. When the use of external electric energy reaches a peak, the electric energy stored in the battery cell is released for use through the chemical reaction or change of the energy storage medium, or transferred for use.

[0060] In some embodiments, as Figure 2 and Figure 3 As shown, the energy storage device 100 includes: a shell 10, an electrode assembly 20 and an end cover assembly 30. The shell 10 has an open accommodating cavity 11, the electrode assembly 20 is accommodated in the accommodating cavity 11, and the end cover assembly 30 seals the opening of the accommodating cavity 11.

[0061] The shell 10 may be a cylindrical structure with one end open. In this case, the energy storage device 100 includes an end cap assembly 30 to seal the opening of the shell 10 through the end cap assembly 30. Of course, the shell 10 may also be a cylindrical structure with both ends open. In this case, the energy storage device 100 includes an end cap assembly 30 and a cover plate, or includes two end cap assemblies 30, so that the two openings of the shell 10 are sealed through the end cap assembly 30 and the cover plate, or the two end cap assemblies 30 respectively.

[0062] Among them, the end cap assembly 30 includes an end cap body 31 and an electrode terminal 32. The electrode terminal 32 is provided on the end cap body 31, and one end is connected to the electrode assembly 20, and the other end is exposed outside the shell 10 to serve as an output end of the energy storage device 100; the end cap body 31 can also be provided with an explosion-proof valve 33 and an injection hole. The explosion-proof valve 33 is used to discharge the gas in the accommodating chamber of the battery shell 10 to improve the safety of the energy storage device 100. The injection hole is used to inject electrolyte into the accommodating chamber 11 of the energy storage device 100.

[0063] The electrode assembly 20 includes a stacked positive electrode sheet, a negative electrode sheet, and a separator, with the separator located between the positive and negative electrode sheets. Both the positive and negative electrode sheets have tabs at their ends, forming the positive and negative tabs of the energy storage device 100. The positive and negative tabs may be located at the same end of the electrode assembly 20, or at different ends of the electrode assembly 20. For example, in the case where the positive and negative tabs are located at different ends of the electrode assembly 20, one of the positive and negative tabs is connected to the electrode terminal 32 included in the end cap assembly 30, and the other is connected to the bottom of the housing 10 or the electrode terminal 32 included in the other end cap assembly 30, so that electrical energy from the electrode assembly 20 is output through the electrode terminal 32 of the end cap assembly 30 and the bottom of the housing 10, or through the electrode terminals 32 of both end cap assemblies 30.

[0064] In the related art, for the connection between the electrode terminal 32 of the end cap assembly 30 and the electrode assembly 20, the end cap assembly 30 usually includes a current collecting plate 40 connected to the electrode terminal 32 during manufacture. In this case, the current collecting plate 40 needs to be connected to the tab of the electrode assembly 20, and the current collecting plate 40 needs to be bent twice to enable the cover body of the end cap assembly 30 to seal the opening of the housing 10. However, when bending the current collecting plate 40, it is easy to cause the end cap assembly 30 and the electrode assembly 20 to be difficult to align due to multiple bending, thereby making it difficult for the current collecting plate 40 to enter the housing and the end cap body 31 to be unable to effectively seal the opening of the housing 10. Alternatively, after the end cap body 31 seals the opening of the housing 10, radial pulling occurs between the current collecting plate 40 and the tab of the electrode assembly 20, causing the tab to tear, etc., which seriously affects the assembly yield of the energy storage device 100.

[0065] An embodiment of the present application provides a current collecting plate 40 that can be connected to the electrode assembly 20 and the electrode terminal 32 based on a single bending, thereby facilitating improved alignment between the electrode assembly 20 and the end cap assembly 30 after the current collecting plate 40 is bent, thereby improving the assembly effect of the energy storage device 100.

[0066] Figure 4 The exploded structural diagram of an end cap assembly 30 and a current collecting plate 40 provided in an embodiment of the present application is illustrated. Figure 5 The schematic diagram of the structure of a collecting plate 40 before bending provided in an embodiment of the present application is illustrated. Figure 6 The schematic diagram of the structure of a collecting plate 40 after bending provided by the embodiment of the present application is illustrated. Figure 4 、 Figure 5 and Figure 6As shown, the collecting plate 40 includes: a first connecting portion 41, a second connecting portion 42 and a third connecting portion 43, wherein the first connecting portion 41 and the second connecting portion 42 are respectively connected to two opposite ends of the third connecting portion 43; the third connecting portion 43 has a bending position 431, and the distance L1 from the bending position 431 to the center point O1 of the first connecting portion 41 is equal to the distance L2 to the center point O2 of the second connecting portion 42, and the bending position 431 is used to bend the collecting plate 40 into a U-shape with the first connecting portion 41 and the second connecting portion 42 relative to each other.

[0067] In this way, the distance from the bending position 431 to the center point of the first connection part 41 is equal to the distance to the center point of the second connection part 42, so that the accuracy of the alignment of the center point of the first connection part 41 and the center point of the second connection part 42 is ensured by bending the collecting plate 40 along the bending position 431 once.

[0068] Among them, such as Figure 5 As shown, the first connecting portion 41 is provided with a central hole 411 located in the center, so that after the electrolyte is injected along the injection hole on the end cover assembly 30, the electrolyte can flow along the central hole 411 to the central through hole of the electrode assembly 20, thereby achieving rapid infiltration of the electrode assembly 20.

[0069] The first connecting portion 41 is connected to the tab of the electrode assembly 20, and the second connecting portion 42 is connected to the electrode terminal 32 of the end cap assembly 30. This ensures that the center points of the first connecting portion 41 and the second connecting portion 42 are accurately aligned, thereby ensuring the accuracy of the alignment of the electrode assembly 20 and the end cap assembly 30. Furthermore, the distance from the bend 431 to the center point of the first connecting portion 41 is less than the radius of the electrode assembly 20, which means that the distance from the bend 431 to the center point of the second connecting portion 42 is also less than the radius of the electrode assembly 20. This ensures that the bent current collecting plate 40 can be accommodated within the accommodating cavity 11 of the housing 10, thereby avoiding affecting the sealing of the end cap assembly 30 on the opening of the housing 10.

[0070] In combination with the current collecting disc 40 described above, when assembling the energy storage device 100, the current collecting disc 40 can be a structural member assembled integrally with the end cap assembly 30 (that is, the second connecting portion 42 of the current collecting member has been connected to the electrode terminal 32 of the end cap assembly 30), or it can be a structural member that needs to be assembled separately; and when the electrode assembly 20 and the end cap assembly 30 are connected through the current collecting disc 40, since the distance from the bending position 431 to the center point of the first connecting portion 41 is less than the radius of the electrode assembly 20, that is, when the current collecting disc 40 is in a flattened state, the distance from the center point of the first connecting portion 41 to the center point of the second connecting portion 42 is less than the radius of the electrode assembly 20 in diameter. In order to avoid interference between the end cover assembly 30 and the electrode assembly 20, the third connection part 43 may be pre-bent at the connection between the first connection part 41 and / or the second connection part 42 (for example, a 90-degree bend, etc.), and then the first connection part 41 and the electrode assembly 20 are connected, and the second connection part 42 and the end cover assembly 30 are connected. After the connection is completed, the pre-bent position is straightened, and the third connection part 43 is bent along the bending position 431 on the third connection part 43 to ensure that the end cover assembly 30 and the electrode assembly 20 are aligned while the end cover assembly 30 covers the opening of the box shell 10.

[0071] For the connection between the first connecting part 41 and the electrode assembly 20, the first connecting part 41 may have a welding area, and then after the first connecting part 41 is pressed onto the electrode tab of the electrode assembly 20, the first connecting part 41 is welded to the electrode tab of the electrode assembly 20 by penetration welding in the welding area.

[0072] In some embodiments, as Figure 5 or Figure 7 As shown, the first connecting portion 41 has a first welding area 412 and a second welding area 413 symmetrically distributed along the length of the bend 431. Thus, by providing the first welding area 412 and the second welding area 413, the first connecting portion 41 and the electrode assembly 20 are connected over a larger area, thereby ensuring the overall stability of the connection between the first connecting portion 41 and the electrode assembly 20 and avoiding the problem of excessive heat generation due to high resistance in a local area.

[0073] Among them, such as Figure 7 or Figure 8 As shown, the first welding area 412 and the second welding area 413 are both V-shaped, and the V-shaped openings of the first welding area 412 and the second welding area 413 are both facing away from the center point of the first connecting portion 41. In this way, the first connecting portion 41 and the electrode assembly 20 are welded at two locations near the center area and four locations near the edge area through the first welding area 412 and the second welding area 413, ensuring the welding area between the first connecting portion 41 and the electrode assembly 20 and ensuring welding stability.

[0074] Of course, the shapes of the first welding area 412 and the second welding area 413 can be not only V-shaped but also arc-shaped, etc., as long as the welding area between the first connecting part 41 and the electrode assembly 20 can be guaranteed and the stability of the welding can be guaranteed. The implementation method of this application does not limit this.

[0075] In some embodiments, as Figure 8 As shown, the first welding area 412 and the second welding area 413 both protrude from one side surface of the first connecting portion 41 in the thickness direction.

[0076] Among them, the first welding area 412 and the second welding area 413 can be formed by stamping or the like to form corresponding first protrusions and second protrusions on the first side surface of the first connection part 41 (the surface of the first connection part 41 facing away from the second connection part 42 after the collecting plate 40 is bent), and corresponding first grooves 414 and second grooves 415 are formed on the second side surface of the first connection part 41 (the surface of the first connection part 41 facing the second connection part 42 after the collecting plate 40 is bent).

[0077] In this way, by setting the first protrusion and the second protrusion, the flatness of the first connecting part 41 on the first side surface is improved, thereby improving the tightness of the contact between the first welding area 412, the second welding area 413 and the upper ear of the electrode assembly 20, avoiding the occurrence of cold welding during welding.

[0078] Furthermore, if Figure 7 As shown, in combination with the above-mentioned situation that the first connecting part 41 has a center hole 411, the second side surface of the first connecting part 41 has a guide groove 416 connecting the first groove 414, the second groove 415 and the center hole 411. Therefore, through the setting of the guide groove 416, the electrolyte gathered in the first groove 414 and the second groove 415 is facilitated to flow along the guide groove 416 and the center hole 411 to the electrode assembly 20, thereby improving the infiltration effect of the electrolyte on the electrode assembly 20.

[0079] It should be noted that the thickness of the first connecting portion 41 is less than or equal to 0.3 mm. For example, the thickness of the first connecting portion 41 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or 0.3 mm. Furthermore, the thickness of the welding zone is less than or equal to 0.15 mm. This improves the welding effect during penetration welding in the welding zone, thereby ensuring the welding effect between the first connecting portion 41 and the electrode assembly 20.

[0080] Regarding the connection between the second connection portion 42 and the end cap assembly 30 , the second connection portion 42 may have a fixing area, and the connection with the electrode terminal 32 included in the end cap assembly 30 is achieved through the fixing area.

[0081] The fixing area of ​​the second connecting portion 42 and the electrode terminal 32 of the end cap assembly 30 can be connected by performing penetration welding on the surface of the second connecting portion 42 facing away from the electrode terminal 32 after the fixing area is attached to the end surface of the electrode terminal 32, thereby achieving a fixed connection between the electrode terminal 32 in the fixing area. When welding the fixing area to the electrode terminal 32, the fixing area can be welded to a side surface of the second connecting portion 42 (i.e., the surface of the second connecting portion 42 facing away from the first connecting portion 41 after the current collecting plate 40 is bent), thereby improving the contact tightness between the fixing area on the second connecting portion 42 and the electrode terminal 32, and improving the tightness of the welding between the fixing area and the electrode terminal 32.

[0082] In some embodiments, as Figure 4 or Figure 9 As shown, the second connection portion 42 has a first fixing area 421 and a second fixing area 422 symmetrically distributed along the length direction of the bending portion 431 .

[0083] The end cap assembly 30 includes a dual electrode terminal 32 that is disposed through the end cap body 31 . The first fixing area 421 and the second fixing area 422 can be connected to the two electrode terminals 32 respectively, thereby matching the energy storage device 100 with the dual electrode terminals 32 .

[0084] In combination with the above, the first fixing area 421 and the second fixing area 422 can be welded to the two electrode terminals 32 respectively. For details, please refer to the connection between the fixing area and the electrode terminal 32 described above, which will not be described in detail in the embodiment of the present application.

[0085] It should be noted that when the fixing area of ​​the second connecting portion 42 is welded to the electrode terminal 32, the thickness of the second connecting portion 42 is less than or equal to 0.3 mm. For example, the thickness of the second connecting portion 42 is 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, and 0.3 mm. Furthermore, the thickness of the fixing area is less than or equal to 0.15 mm. In this way, it is easy to improve the welding effect when performing penetration welding in the fixing area, that is, to ensure the welding effect of the second connecting portion 42 and the electrode assembly 20. In addition, if Figure 9 and Figure 10 As shown, the second connecting portion 42 has an escape notch 423 on one side of its edge away from the first connecting portion 41. In the thickness direction of the second connecting portion 42, the escape notch 423 overlaps with the explosion-proof valve 33 of the end cap assembly 30, so that the escape notch 423 allows the area corresponding to the explosion-proof valve 33 on the end cap assembly 30 to be avoided. For example, the escape notch 423 can be an arc-shaped notch, so that the second connecting portion 42 having the first fixing area 421 and the second fixing area 422 forms a fishtail-shaped structure.

[0086] In some embodiments, as Figure 7 or Figure 9As shown, the bending portion 431 has bending grooves 432 located on both side edges of the third connecting portion 43 .

[0087] In this way, the bending grooves 432 at both ends of the bending position 431 facilitate marking of the bending position 431, thereby facilitating the improvement of the bending efficiency of the collecting plate 40 while ensuring the bending effect; in addition, based on the setting of the bending grooves 432, it is convenient to reduce the resistance of the collecting plate 40 when bending.

[0088] Among them, the bending position 431 is arc-shaped after bending, and the bending grooves 432 at both ends of the bending position 431 can be arc grooves to avoid stress concentration after bending, while ensuring that the U-shaped collecting plate 40 has a certain elastic deformation space to achieve elastic limitation of the electrode assembly 20 in the accommodating cavity 11.

[0089] In some embodiments, the connection between the first connection portion 41 or the second connection portion 42 and the third connection portion 43 has a bending notch 433 located at the edge. Figure 7 or Figure 9 As shown, the connection between the first connection portion 41 and the third connection portion 43 has a bending notch 433 located at the edge, or as shown in FIG. Figure 10 As shown, the connection between the second connection portion 42 and the third connection portion 43 has a bending notch 433 located at the edge.

[0090] In this way, by providing a bending notch 433 at the edge of the connection between the first connection part 41 or the second connection part 42 and the third connection part 43, it is convenient to mark the pre-bending position 431, thereby improving the pre-bending efficiency of the collecting plate 40.

[0091] In some embodiments, as Figure 11 As shown, the surface of the third connection portion 43 has a first group of reinforcing ribs 434 and a second group of reinforcing ribs 435 . The first group of reinforcing ribs 434 and the second group of reinforcing ribs 435 are respectively located on both sides of the bending position 431 .

[0092] In this way, the first and second sets of reinforcing ribs 434 and 435 limit the bending position 431 of the third connection portion 43 when bending along the bending position 431 , thereby ensuring the bending effect of the third connection portion 43 and further ensuring the bending effect of the collecting plate 40 .

[0093] The first group of reinforcing ribs 434 and the second group of reinforcing ribs 435 are both disposed adjacent to the bending position 431 to effectively limit the position of the bending position 431 when the third connecting portion 43 is bent.

[0094] The structures of the first group of reinforcing ribs 434 and the second group of reinforcing ribs 435 can be the same or different. Taking the first group of reinforcing ribs 434 as an example, the first group of reinforcing ribs 434 can be a mesh structure, or the first group of reinforcing ribs 434 includes a plurality of ribs, the length direction of the ribs is perpendicular to the length direction of the bending position 431, and the plurality of ribs are spaced apart along the length direction of the bending position 431. For example, Figure 11 As shown, the first group of reinforcing ribs 434 and the second group of reinforcing ribs 435 are both mesh structures.

[0095] The embodiment of the present application also provides an electric device 400, which can be a user energy storage cabinet, an energy storage container, etc. Figure 12 As 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.

[0096] Thus, in combination with the above, during use, the electrical equipment 400 of the present application can effectively ensure the yield of the energy storage device 100 based on a single bending of the collecting plate 40 , thereby ensuring the power supply stability of the energy storage device 100 to the electrical equipment 400 .

[0097] In the embodiments of the present application, 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. Terms such as "installed", "connected", "connected", and "fixed" 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 embodiments of the present application can be understood according to the specific circumstances.

[0098] In the description of the embodiments of the present application, it should be understood that the directions or positional relationships indicated by terms such as "up", "down", "left", "right", "front", and "back" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limiting the embodiments of the present application.

[0099] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the implementation methods of this application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0100] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be modified and varied in various ways. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention.

Claims

1. A collecting plate, characterized in that: include: A first connecting portion (41), a second connecting portion (42) and a third connecting portion (43), wherein the first connecting portion (41) and the second connecting portion (42) are respectively connected to two opposite ends of the third connecting portion (43); The third connecting portion (43) has a bending position (431), the distance from the bending position (431) to the center point of the first connecting portion (41) is equal to the distance from the bending position (431) to the center point of the second connecting portion (42), and the bending position (431) is used to bend the collecting plate (40) into a U-shape with the first connecting portion (41) and the second connecting portion (42) facing each other.

2. The collecting tray according to claim 1, wherein: The surface of the third connecting portion (43) has a first group of reinforcing ribs (434) and a second group of reinforcing ribs (435), and the first group of reinforcing ribs (434) and the second group of reinforcing ribs (435) are respectively located on both sides of the bending position (431).

3. The collecting tray according to claim 2, wherein: The first group of reinforcing ribs (434) and the second group of reinforcing ribs (435) are both mesh structures.

4. The collecting tray according to claim 1, wherein: The bending portion (431) has bending grooves (432) located on both side edges of the third connecting portion (43).

5. The collecting tray according to claim 1, wherein: A connection point between the first connection portion (41) or the second connection portion (42) and the third connection portion (43) has a bending notch (433) located at the edge.

6. The collecting tray according to any one of claims 1 to 5, characterized in that: The first connecting portion (41) has a first welding area (412) and a second welding area (413) symmetrically distributed along the length direction of the bending position (431); The first welding area (412) and the second welding area (413) are both V-shaped, and the V-shaped openings of the first welding area (412) and the second welding area (413) are both facing away from the center point of the first connecting portion (41).

7. The collecting tray according to claim 6, wherein: The first welding area (412) and the second welding area (413) both protrude from one side surface of the first connecting portion (41) in the thickness direction.

8. The collecting tray according to any one of claims 1 to 5, characterized in that: The thickness of the first connecting portion (41) is less than or equal to 0.3 mm.

9. The current collecting tray according to any one of claims 1 to 5, characterized in that: The second connecting portion (42) has a first fixing area (421) and a second fixing area (422) symmetrically distributed along the length direction of the bending position (431).

10. The collecting tray according to claim 9, wherein: An edge of one side of the second connecting portion (42) away from the first connecting portion (41) has an avoidance notch (423).

11. An energy storage device, characterized in that: include: A housing (10) comprising a receiving cavity (11) having an opening; An electrode assembly (20) is accommodated in the accommodating cavity (11); an end cap assembly (30) for sealing the opening of the accommodating cavity (11); The current collecting plate (40) according to any one of claims 1 to 10, wherein the current collecting plate (40) is U-shaped, and the first connecting portion (41) is connected to the electrode assembly (20), and the second connecting portion (42) is connected to the end cover assembly (30).

12. An electrical device, characterized in that: The electrical device (400) includes the energy storage device (100) according to claim 11, and the energy storage device (100) supplies power to the electrical device (400).

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