End cover assembly, energy storage device, electrical equipment and household energy storage system

Abstract

The present application discloses an end cover assembly, an energy storage device, an electrical equipment and a household energy storage system. Among them, the end cover assembly is applied to the energy storage device, and the energy storage device includes a current collector plate and an electrode assembly. The current collector plate includes an extension portion and a plate body portion. The extension portion is connected to one side of the plate body portion, and a positioning hole is provided on the extension portion, and the positioning hole penetrates through the extension portion. The end cover assembly includes an insulating component, the insulating component includes a body portion, the body portion has a first surface and a second surface arranged opposite to each other, the insulating component further includes a receiving groove, the insulating component further includes a positioning body, the positioning body protrudes from the bottom wall of the receiving groove, the positioning body protrudes from the second surface and the positioning body has elasticity; the extension portion is received in the receiving groove, and each positioning body passes through a positioning hole; the plate body portion is bent relative to the extension portion, the plate body portion covers the second surface of the insulating component, and the plate body portion abuts against the positioning body. The present application can improve the energy density of the energy storage device.

Description

Technical Field

[0001] The present application relates to the technical field of energy storage, and particularly relates to an end cover assembly, an energy storage device, an electrical equipment, and a household energy storage system. Background Art

[0002] With the gradually increasing demand for secondary energy storage devices, people have higher and higher requirements for their various performances. In particular, for the cycle performance of energy storage devices, and the energy density of energy storage devices is an important parameter to ensure the cycle performance of energy storage devices. Too low energy density per unit volume will lead to low capacity and poor cycle performance of energy storage devices. The existing cylindrical lithium-ion energy storage device is also a secondary energy storage device, which is composed of an end cover assembly, a current collector plate, an electrode assembly, and a cylindrical housing. The current collector plate connects the pole column of the end cover assembly and the tab of the electrode assembly. Since most of the existing current collector plates are flat, the connection part with the pole column and the connection part with the tab are on the same plane, so the current collector plate occupies a large space inside the secondary energy storage device. In the same volume, the space that the electrode assembly can occupy is smaller, which restricts the energy density of the secondary energy storage device. Summary of the Invention

[0003] The present application provides an end cover assembly, which can solve the technical problem that the current collector plate occupies a large gap inside the secondary energy storage device, resulting in the restriction of the energy density of the secondary energy storage device.

[0004] An end cover assembly is applied to an energy storage device. The energy storage device includes a current collector plate and an electrode assembly. The current collector plate includes an extension part and a plate body part. The extension part is connected to one side of the plate body part and extends away from the plate body part.

[0005] A positioning hole is provided on the extension part, and in the thickness direction of the extension part, the positioning hole penetrates through the extension part.

[0006] The end cover assembly includes an insulating component. The insulating component includes a body part, and the body part has a first surface and a second surface, and the first surface and the second surface are arranged opposite to each other.

[0007] The insulating component further includes a receiving groove, and the receiving groove is recessed on the second surface.

[0008] The insulating component further includes at least one positioning body, and the at least one positioning body protrudes from the bottom wall of the receiving groove. Along the thickness direction of the body part, the at least one positioning body protrudes from the second surface and the positioning body has elasticity.

[0009] The extension part is received in the receiving groove, and each positioning body passes through a positioning hole; the disc part is bent relative to the extension part so that in the thickness direction of the insulating component, the disc part covers the second surface, and the disc part abuts against the positioning body;

[0010] The end cover assembly is connected to the electrode assembly, the current collecting disc is located between the end cover assembly and the electrode assembly, and the disc part is connected to the electrode assembly.

[0011] In a possible implementation manner, the number of the positioning bodies is two, the heights of the two positioning bodies are the same, the receiving groove has a central axis extending along the length direction of the receiving groove, the two positioning bodies are respectively arranged on opposite sides of the central axis of the receiving groove, and the perpendicular distances between the two positioning bodies and the central axis of the receiving groove are equal.

[0012] In a possible implementation manner, along the length direction of the receiving groove, the two positioning bodies are arranged in a staggered manner.

[0013] In a possible implementation manner, the height of the positioning body protruding from the second surface is 0.3 mm - 1.0 mm.

[0014] In a possible implementation manner, the positioning body includes an end face away from the receiving groove and a peripheral side face connected to the end face, and a chamfer is formed at the connection between the end face of the positioning body and the peripheral side face of the positioning body, and the chamfer is inclined from the end face of the positioning body towards the peripheral side face of the positioning body.

[0015] In a possible implementation manner, the positioning body includes a boss and a column, the boss protrudes from the bottom wall of the receiving groove, the column protrudes from the surface of the boss facing away from the bottom wall of the receiving groove and extends away from the boss; the end of the column away from the boss is a bent end, and the column is an elastic body;

[0016] The disc part abuts against the end of the column away from the boss, and the boss passes through the positioning hole.

[0017] In a possible implementation manner, the positioning body includes a convex block, a first convex rib and a second convex rib, the convex block protrudes from the bottom wall of the receiving groove; the first convex rib protrudes from the surface of the convex block facing away from the bottom wall of the receiving groove, the second convex rib protrudes from the surface of the convex block facing away from the bottom wall of the receiving groove, along the thickness direction of the insulating component, the orthographic projection of the second convex rib at least partially overlaps with the orthographic projection of the first convex rib, and the first convex rib and the second convex rib are elastic bodies;

[0018] The disk body portion abuts against the end of the first rib away from the bump, and the bump passes through the positioning hole.

[0019] In a possible implementation manner, the end of the second rib away from the bump abuts against the first rib.

[0020] In a possible implementation manner, the insulating component further includes a first clamping portion and a second clamping portion. The first clamping portion and the second clamping portion are respectively arranged on two opposite side walls of the accommodating groove. There is a gap between the first clamping portion and the second clamping portion and the bottom wall of the accommodating groove. Along the thickness direction of the end cover assembly, the extending portion is limited in the gap between the first clamping portion and the bottom wall of the accommodating groove, and the gap between the second clamping portion and the bottom wall of the accommodating groove.

[0021] In a possible implementation manner, the body portion includes a circumferential side surface connecting the first surface and the second surface. The circumferential side surface has a notch, and along the length direction of the accommodating groove, the notch communicates with the accommodating groove; the first clamping portion and the second clamping portion are located on opposite sides of the notch.

[0022] The present application provides an energy storage device, including a housing, an electrode assembly, a current collector disk, and the end cover assembly as described above. The housing has an opening, the housing is provided with an accommodating cavity, the electrode assembly is accommodated in the accommodating cavity, the end cover assembly covers the opening, and the disk body portion is connected to the electrode assembly.

[0023] In a possible implementation manner, the current collector disk further includes a connecting portion. The connecting portion connects the disk body portion and the extending portion. The connecting portion is made of a flexible material. By bending the connecting portion, the disk body portion can be bent relative to the extending portion.

[0024] In a possible implementation manner, the aperture of the positioning hole is larger than the diameter of the positioning body, and the difference between the aperture of the positioning hole and the diameter of the positioning body is 0.5 mm - 1.0 mm.

[0025] In a possible implementation manner, the number of the positioning holes is two. The extending portion has a central axis, and the two positioning holes are respectively arranged on opposite sides of the central axis of the extending portion, and the perpendicular distances from the two positioning holes to the central axis of the extending portion are equal.

[0026] In a possible implementation manner, along the width direction of the extending portion, the perpendicular distance between the positioning hole and the nearest side of the extending portion is 3.0 mm - 5.0 mm.

[0027] The present application further provides an electrical device, including the energy storage device as described above, and the energy storage device is used to supply power to the electrical device.

[0028] The present application also provides a household energy storage system, including the energy storage device, the power conversion device, and the user load as described above. The energy storage device stores the electric energy of the power conversion device and transmits the electric energy to the user load.

[0029] By bending the current collector plate, the plate body part of the current collector plate is stacked on the side of the extension part facing away from the insulating component. Compared with the extension part and the plate body part being in the same plane, the occupied space of the current collector plate inside the energy storage device can be reduced, the space utilization rate of the energy storage device can be improved, and the energy density of the energy storage device can be further improved. Since the bent plate body part abuts against the end part of the positioning body, and the positioning body is an elastic body, when the energy storage device collides or drops, the positioning body can buffer the vibration of the plate body part, avoid the connection part of the current collector plate from breaking due to the vibration of the plate body part, and can improve the connection stability between the plate body part and the ear of the electrode assembly, thereby improving the overall structural stability of the energy storage device. Through the mutual cooperation between the positioning body on the insulating component and the positioning hole of the extension part of the current collector plate, the positioning body of the insulating component can limit the extension part of the current collector plate; at the same time, during the bending process of the current collector plate, the positioning body of the insulating component can limit the degree to which the extension part of the current collector plate is driven to tilt upward due to the bending operation, thereby avoiding the end part of the extension part of the current collector plate from breaking at the welding edge of the flange part of the pole column, ensuring the connection reliability between the end part of the extension part of the current collector plate and the flange part of the pole column, making the bending process faster and more labor-saving, and further improving the yield and efficiency of mass production. Description of the Drawings

[0030] In order to more clearly illustrate the technical solutions of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained as these drawings.

[0031] Figure 1 It is an application scenario diagram of the energy storage device provided by the embodiment of the present application;

[0032] Figure 2 It is a partial structural decomposition diagram of the energy storage device provided by the embodiment of the present application;

[0033] Figure 3 is Figure 2 a partial structural decomposition diagram of the end cover assembly of the energy storage device shown;

[0034] Figure 4 is Figure 3 a partial structural decomposition diagram of the end cover assembly shown from another angle;

[0035] Figure 5 is Figure 3 a schematic structural diagram of the top cover shown;

[0036] Figure 6 is Figure 5 a schematic structural diagram of the top cover shown from another angle;

[0037] Figure 7 is Figure 3 a schematic structural diagram of the insulating component shown;

[0038] Figure 8 is Figure 7 a schematic structural diagram of the insulating component shown from another angle;

[0039] Figure 9 is Figure 2 a schematic structural diagram of the second embodiment of the insulating component shown, which shows another angle of the insulating component;

[0040] Figure 10 is Figure 2 a schematic structural diagram of the third embodiment of the insulating component shown, which shows another angle of the insulating component;

[0041] Figure 11 is Figure 3 a schematic cross-sectional diagram of the end cover assembly shown;

[0042] Figure 12 is Figure 2 a schematic structural diagram of the current collector shown;

[0043] Figure 13 is Figure 12 a schematic structural diagram of the current collector shown from another angle;

[0044] Figure 14 is Figure 2 a schematic diagram of the assembly process of the end cover assembly of the energy storage device shown, where the current collector is in an unfolded state;

[0045] Figure 15 is Figure 14 a schematic diagram of the assembly of the end cover assembly of the energy storage device shown, where the current collector is in a folded state;

[0046] Figure 16 is Figure 2 shown current collector and Figure 9 a schematic assembly structure diagram of the insulating component of the second embodiment shown;

[0047] Figure 17 is Figure 2 shown current collector and Figure 10 a schematic assembly structure diagram of the insulating component of the third embodiment shown;

[0048] Figure 18 is Figure 2 a partially exploded schematic view of the energy storage device shown

[0049] The nouns corresponding to the reference numerals in the figure are: 5000 household energy storage system, 4000 power conversion device, 3000 user load 1, 2000 user load 2, 1000 energy storage device, 100 end cap assembly, 200 current collector plate, 300 electrode assembly, 310 cell body, 320 tab, 400 housing, 20 top cover, 21 top cover body, 211 pole hole, 212 liquid injection hole, 213 first mounting surface, 2131 mounting groove, 2132 liquid injection groove, 214 second mounting surface, 2141 protrusion, 215 through groove, 22 explosion-proof valve, 10 insulating member, 11 body portion, 111 first surface, 112 second surface, 113 peripheral side surface, 114 pole through hole, 115 ventilation groove, 1151 groove bottom wall, 1152 ventilation hole, 116 liquid injection through groove, 1161 groove bottom wall, 1162 liquid injection through hole, 13 accommodation groove, 131 first groove side wall, 132 second groove side wall, 133 third groove side wall, 134 groove bottom wall, 135 notch, 14 positioning body, 141 boss, 142 column, 143 bump, 144 first rib, 145 second rib, 151 first clamping portion, 1511 first pressing body, 1512 first abutting body, 152 second clamping portion, 1521 second pressing body, 1522 second abutting body, 40 disc body portion, 41 body, 411 third surface, 412 fourth surface, 413 electrolyte hole, 414 groove, 42 welding protrusion, 50 connecting portion, 60 extending portion, 61 fifth surface, 62 sixth surface, 63 positioning hole, 64 first notch, 65 second notch, 30 upper plastic, 30 through hole, 70 pressing block, 80 pole, 81 pole column body, 82 flange portion, 90 sealing ring. Specific embodiments

[0050] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0051] Since the energy required by people has strong temporality and spatiality, in order to rationally utilize energy and improve the energy utilization rate, it is necessary to store one form of energy in the same or converted into another form of energy through a medium or device, and then release it in a specific energy form based on future application needs. As is well known, to achieve the major goal of carbon neutrality, the current main way to generate green electricity is to develop green energy such as photovoltaic and wind power to replace fossil energy. Currently, the generation of green electricity generally depends on photovoltaic, wind power, water potential, etc. However, wind energy and solar energy generally have problems such as strong intermittency and large volatility, which will cause the power grid to be unstable. There is not enough electricity during peak electricity consumption, and too much electricity during low electricity consumption. The unstable voltage will also damage the power. Therefore, due to insufficient electricity demand or insufficient grid acceptance capacity, the problem of "abandoning wind and light" may occur. To solve these problems, energy storage is required. That is, the electric energy is converted into other forms of energy and stored through physical or chemical means, and the energy is converted into electric energy and released when needed. Simply put, energy storage is similar to a large "power bank". When photovoltaic and wind energy are sufficient, the electric energy is stored, and the stored electricity is released when needed.

[0052] Taking electrochemical energy storage as an example, this solution provides an energy storage device. There is a set of chemical batteries in the energy storage device. It mainly uses the chemical elements in the chemical batteries as the energy storage medium. The charge and discharge process is accompanied by chemical reactions or changes of the energy storage medium. Simply put, the electric energy generated by wind energy and solar energy is stored in the chemical batteries, and the stored electricity is released when the external electricity consumption reaches the peak, or transferred to places with tight electricity and used again.

[0053] The current 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 connection energy storage, and user side energy storage, etc. The types of corresponding energy storage devices include:

[0054] (1) The large energy storage container applied to the grid side energy storage scenario can be used as a high-quality active and reactive power regulation power source in the grid, realizing the load matching of electric energy in time and space, enhancing the consumption capacity of renewable energy, and being of great significance in the grid system standby, relieving the power supply pressure during peak loads, and peak shaving and frequency modulation.

[0055] (2) The small and medium-sized energy storage cabinets applied to the industrial and commercial energy storage scenarios (such as banks, shopping malls, etc.) on the user side and the household small energy storage boxes applied to the 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 the electricity demand, after the user has an energy storage device, in order to reduce costs, usually during the low electricity price period, the energy storage cabinet / box is charged; during the peak electricity price period, the electricity in the energy storage device is released for use 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 the user providing a backup power supply for himself and the power grid, eliminating the inconvenience caused by frequent power outages due to disasters or other reasons.

[0056] Figure 1 This is the application scenario diagram of the energy storage device provided by the embodiment of the present application. The embodiment of the present application takes the household energy storage scenario in the user-side energy storage as an example for illustration, and the energy storage device of the present application is not limited to the household energy storage scenario.

[0057] The present application provides a household energy storage system 5000, which includes an electric energy conversion device (photovoltaic panel) 4000, user loads 1 (street lights) 3000, user loads 2 (household appliances) 2000, etc., and an energy storage device 1000. The energy storage device 1000 is a small energy storage box and can be installed on the outdoor wall in a wall-mounted manner. Specifically, the photovoltaic panel can convert solar energy into electric energy during the low electricity price period, and the energy storage device 1000 is used to store the electric energy and supply it to the street lights and household appliances for use during the peak electricity price period, or supply power when the power grid is powered off / out of power.

[0058] It can be understood that the energy storage device 1000 may include but is not limited to single cells, battery modules, battery packs, battery systems, etc. When the energy storage device 1000 is a single cell, it can be a cylindrical battery. The embodiment of the present application only takes the energy storage device 1000 as a cylindrical battery as an example for illustration.

[0059] Please refer to Figure 2 , Figure 2 which shows a partial structural decomposition diagram of the energy storage device provided by the embodiment of the present application.

[0060] The present application provides an energy storage device 1000 for supplying power to an electrical device (not shown in the figure). The energy storage device 1000 can be a battery or other components with power storage functions. In this embodiment, the energy storage device 1000 is a cylindrical battery. Taking an automobile as an example for the electrical device, the automobile can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. The automobile includes an energy storage device, a controller, and a motor. The energy storage device 1000 is used to supply power to the controller and the motor, serving as the operating power source and driving power source of the automobile. For example, the energy storage device 1000 is used for the starting, navigation, and working power requirements during the operation of the automobile; for another example, the energy storage device 1000 supplies power to the controller, and the controller controls the energy storage device 1000 to supply power to the motor, and the motor receives and uses the power of the energy storage device 1000 as the driving power source of the automobile, replacing or partially replacing fuel or natural gas to provide driving power for the automobile. It can be understood that the energy storage device 1000 can also be a square battery or other components with power storage functions.

[0061] In this embodiment, the energy storage device 1000 includes a housing 400, an electrode assembly 300, an end cap assembly 100, and a current collector plate 200 connecting the electrode assembly 300 and the end cap assembly 100. The housing 400 includes an opening and a receiving cavity. The electrode assembly 300 is received in the receiving cavity, and the end cap assembly 100 is sealed to the opening. The current collector plate 200 is disposed on a side of the end cap assembly 100 close to the electrode assembly 300, and the current collector plate 200 is used to connect the tab of the electrode assembly 300 and the terminal post of the end cap assembly 100.

[0062] The electrode assembly 300 includes a cell body 310 and tabs 320. The cell body 310 is formed by stacking or winding a positive electrode plate, a negative electrode plate, and an insulating film located between the positive electrode plate and the negative electrode plate. Both the positive electrode plate and the negative electrode plate include a first portion coated with an active material and a second portion extending outward from the first portion without being coated with the active material. The tabs 320 include a negative tab and a positive tab. The negative tab corresponds to the second portion of the negative electrode plate without being coated with the active material, and the positive tab corresponds to the second portion of the positive electrode plate without being coated with the active material. Along the height direction of the cell body 310, the negative tab and the positive tab are respectively located at opposite ends of the cell body 310.

[0063] It should be noted that the end cap assembly 100 provided in the present application can be used to connect to the negative tab of the electrode assembly 300 through the current collector plate 200, or can also be used to connect to the positive tab of the electrode assembly 300 through the current collector plate 200. The embodiments of the present application do not strictly limit this.

[0064] Please refer to Figure 2 、 Figure 3 and Figure 4 , Figure 3 ForFigure 2 Partial structural exploded view of the end cap assembly of the energy storage device shown Figure 4 is Figure 3 Another partial structural exploded view of the end cap assembly shown. The end cap assembly 100 includes an insulating member 10 and a top cover 20. The top cover 20 and the insulating member 10 are stacked and can be fixedly connected, and the insulating member 10 is used to insulate the top cover 20 from the electrode assembly 300. In this embodiment, the top cover 20 is a light aluminum part, and the insulating member 10 is made of plastic material and is insulating.

[0065] Please refer to Figure 5 and Figure 6 , Figure 5 is Figure 3 The structural schematic diagram of the top cover shown; Figure 6 is Figure 5 Another angle structural schematic diagram of the top cover shown. In this embodiment, the top cover 20 includes a top cover body 21 and an explosion-proof valve 22. The top cover body 21 further includes a pole hole 211 and a liquid injection hole 212. The pole hole 211 is located at the middle position of the top cover body 21, and the explosion-proof valve 22 and the liquid injection hole 212 are respectively located on opposite sides of the pole hole 211.

[0066] Specifically, the top cover body 21 is a circular plate. Along the thickness direction of the top cover body 21, the top cover body 21 includes a first mounting surface 213 and a second mounting surface 214 arranged opposite to each other. In this embodiment, the first mounting surface 213 is provided with a mounting groove 2131. The mounting groove 2131 is recessed in the middle position of the first mounting surface 213; along the thickness direction of the top cover body 21, the pole hole 211 penetrates through the bottom wall of the mounting groove 2131 and the second mounting surface 214 of the top cover body 21. The pole hole 211 is used for the pole of the energy storage device 1000 to pass through. In this embodiment, the mounting groove 2131 is a cross-shaped groove.

[0067] The first mounting surface 213 is further provided with a liquid injection groove 2132. The liquid injection groove 2132 is recessed in the first mounting surface 213 and is located on the side of the mounting groove 2131. The second mounting surface 214 is convexly provided with a protruding portion 2141. The protruding portion 2141 is formed by the liquid injection groove 2132 being recessed into the first mounting surface 213 and protrudes from the second mounting surface 214. Along the thickness direction of the top cover body 21, the liquid injection hole 212 penetrates through the bottom wall of the liquid injection groove 2132 and the protruding portion 2141. In this embodiment, the liquid injection groove 2132 is a circular groove. During the liquid injection process of the energy storage device 1000, electrolyte is injected into the energy storage device 1000 through the liquid injection hole 212 on the top cover 20.

[0068] Located at the side position of the top cover body 21, there is also a through groove 215 penetrating through the first mounting surface 213 and the second mounting surface 214, and the through groove 215 is located on the side of the mounting groove 2131 away from the liquid injection groove 2132. The explosion-proof valve 22 is accommodated in the through groove 215 and welded to the groove wall of the through groove 215. When the internal pressure of the energy storage device 1000 is too high, the explosion-proof valve 22 will automatically open to relieve pressure to prevent explosion. In this embodiment, the top cover 20 may further include a protective film (not shown in the figure), and the protective film is provided at one end of the through groove 215 close to the first mounting surface 213. The protective film can prevent foreign objects from entering the explosion-proof valve 22 or damaging the explosion-proof valve 22.

[0069] Please refer to Figure 7 、 Figure 8 , Figure 7 is Figure 3 a schematic structural diagram of the insulating component shown in Figure 8 and Figure 7 is

[0070] a schematic structural diagram of the insulating component from another angle shown in

[0071] As shown in Figure 8, a receiving groove 13 is further provided on the insulating component 10. The receiving groove 13 is recessed in the second surface 112 and has a notch 135. Specifically, the notch 135 penetrates the peripheral side surface 113 of the main body portion 11. It can also be understood that a notch 135 is provided on the peripheral side surface 113 of the main body portion 11, and the notch 135 communicates with the receiving groove 13. The receiving groove 13 includes a first groove side wall 131, a second groove side wall 132, a third groove side wall 133 and a groove bottom wall 134. The first groove side wall 131, the second groove side wall 132 and the third groove side wall 133 are all convexly provided on the groove bottom wall 134 and extend in a direction away from the groove bottom wall 134; the first groove side wall 131, the second groove side wall 132 and the third groove side wall 133 are all arranged at an angle with the groove bottom wall 134. The second groove side wall 132 is connected between the first groove side wall 131 and the third groove side wall 133 to form a U-shaped structure. The pole column through hole 114 penetrates the first surface 111 of the main body portion 11 and the groove bottom wall 134 of the receiving groove 13.

[0072] Specifically, the first groove side wall 131 and the third groove side wall 133 are respectively located on opposite sides of the notch 135. The second groove side wall 132 is located on the side of the pole column through hole 114 away from the notch 135 and is spaced opposite to the notch 135, and the pole column through hole 114 is located between the notch 135 and the second groove side wall 132. It can be understood that the notch 135 is the opening of the receiving groove 13.

[0073] The insulating component 10 further includes a positioning body 14, and the positioning body 14 is convexly provided on the groove bottom wall 134 of the receiving groove 13. In this embodiment, the positioning body 14 is cylindrical. The positioning body 14 is also provided with a chamfer. The positioning body 14 includes an end face away from the receiving groove 13 and a peripheral side surface connected to the end face. A chamfer is formed at the connection between the end face of the positioning body 14 and the peripheral side surface of the positioning body 14, and the chamfer is inclined from the end face of the positioning body 14 towards the peripheral side surface of the positioning body 14. It can be understood that along the thickness direction of the insulating component 10, the positioning body 14 is a truncated cone column. The end of the positioning body 14 is provided with a chamfer, which can prevent the end face of the positioning body 14 from scratching the extension portion 60 of the current collecting plate 200 when the positioning body 14 is inserted into the positioning hole 63 of the extension portion 60 of the current collecting plate 200, and it is also convenient for the positioning body 14 of the insulating component 10 to pass through the positioning hole 63 of the extension portion 60.

[0074] The number of the positioning bodies 14 is at least one. In this embodiment, the number of the positioning bodies 14 is two. The height dimensions of the two positioning bodies 14 (the distance between the end face of the positioning body 14 away from the bottom wall 134 of the accommodation groove 13 and the bottom wall 134 of the accommodation groove 13) are the same. The height dimension of the positioning body 14 protruding from the second surface 112 of the main body portion 11 is 0.3 mm - 1.0 mm. Specifically, it can be 0.3 mm, or 1.0 mm, or any value between 0.3 and 1.0. Along the width direction of the accommodation groove 13, the two positioning bodies 14 are respectively arranged on the opposite sides of the central axis of the accommodation groove 13 (the central axis refers to the bisector of the width of the accommodation groove 13 and extends along the length direction of the accommodation groove 13), and the perpendicular distances between the two positioning bodies 14 and the central axis of the accommodation groove 13 are equal. Along the length direction of the accommodation groove 13, the two positioning bodies 14 are arranged in a staggered manner; along the width direction of the accommodation groove 13, the two positioning bodies 14 are arranged in a staggered manner.

[0075] In this embodiment, the positioning body 14 is an elastic body. Specifically, the positioning body 14 can be an elastic plastic part. In other embodiments, the positioning body 14 can also be other shapes such as a tapered column, and the positioning body 14 satisfies that the area of the end face of the free end is smaller than the cross-sectional area away from the free end. Along the length direction or the width direction of the accommodation groove 13, the positioning bodies 14 can also be arranged in alignment.

[0076] Please refer to Figure 9 , Figure 9 is Figure 2 a schematic structural view of the second embodiment of the insulating component shown, which shows another angle of the insulating component. The difference between this embodiment and the above embodiment lies in the structure of the positioning body 14.

[0077] In this embodiment, the positioning body 14 includes a boss 141 and a column 142. The boss 141 is generally a quadrilateral block, and the boss 141 protrudes from the bottom wall 134 of the accommodation groove 13. The column 142 is strip-shaped, and the column 142 protrudes from the surface of the boss 141 facing away from the bottom wall 134 of the accommodation groove 13 and extends in a direction away from the boss 141. The end of the column 142 away from the boss 141 is a bent end. Specifically, in this embodiment, the bent end of the column 142 is an arc structure, and the end of the column 142 away from the boss 141 bends and extends in a direction close to the boss 141. In other embodiments, the bent end of the column 142 can also be an L-shaped structure, and the end of the column 142 away from the boss 141 can also bend and extend in a direction parallel to the bottom wall 134 of the accommodation groove 13.

[0078] In this embodiment, the column 142 is an elastic body. Specifically, the column 142 can be an elastic plastic part. In other embodiments, the boss 141 can also be an elastic body; the boss 141 can also be other block structures such as a triangle or a pentagon.

[0079] The number of the positioning bodies 14 is at least one. In this embodiment, the number of the positioning bodies 14 is two. The height dimensions of the two positioning bodies 14 (the distance between the end face of the column body 142 of the positioning body 14 away from the bottom wall 134 of the accommodating groove 13 and the bottom wall 134 of the accommodating groove 13) are the same. The height dimension of the positioning body 14 protruding from the second surface 112 of the main body portion 11 is 0.3 mm - 1.0 mm. Specifically, it can be 0.3 mm, or 1.0 mm, or any value between 0.3 and 1.0. Along the width direction of the accommodating groove 13, the two positioning bodies 14 are respectively arranged on the opposite sides of the central axis of the accommodating groove 13 (the central axis refers to the bisector of the width of the accommodating groove 13 and extends along the length direction of the accommodating groove 13), and the perpendicular distances between the two positioning bodies 14 and the central axis of the accommodating groove 13 are equal. Along the length direction of the accommodating groove 13, the two positioning bodies 14 are arranged in a staggered manner; along the width direction of the accommodating groove 13, the two positioning bodies 14 are arranged in a staggered manner. In other embodiments, along the length direction or the width direction of the accommodating groove 13, the positioning bodies 14 can also be arranged in an aligned manner.

[0080] Please refer to Figure 10 , Figure 10 is Figure 2 a schematic structural view of the third embodiment of the insulating component shown, in which another angle of the insulating component is shown. The difference between this embodiment and the above embodiment lies in the structure of the positioning body 14.

[0081] In this embodiment, the positioning body 14 includes a convex block 143, a first convex rib 144 and a second convex rib 145. The convex block 143 is generally a quadrilateral block, and the convex block 143 protrudes from the bottom wall 134 of the accommodating groove 13. The first convex rib 144 protrudes from the surface of the convex block 143 facing away from the bottom wall 134 of the accommodating groove 13. The first convex rib 144 extends in a direction away from the convex block 143. The first convex rib 144 is in an arc shape and the extending track of the first convex rib 144 is an arc. The second convex rib 145 protrudes from the surface of the convex block 143 facing away from the bottom wall 134 of the accommodating groove 13. The second convex rib 145 is located between the first convex rib 144 and the convex block 143, and along the thickness direction of the insulating component 10, the orthographic projection of the first convex rib 144 on the insulating component 10 and the orthographic projection of the second convex rib 145 on the insulating component 10 at least partially overlap. In this embodiment, the second convex rib 145 abuts against the surface of the first convex rib 144 facing the bottom wall 134 of the accommodating groove 13. In other embodiments, along the height direction of the positioning body 14, one end of the second convex rib 145 away from the convex platform 141 can also be spaced from the first convex rib 144, that is, the second convex rib 145 does not abut against the first convex rib 144. It can be understood that along the thickness direction of the insulating component 10, the second convex rib 145 and the first convex rib 144 are spaced from each other. When the first convex rib 144 deforms towards the convex block 143, the second convex rib 145 abuts against the first convex rib 144.

[0082] In this embodiment, both the first rib 144 and the second rib 145 are elastomers. Specifically, the first rib 144 and the second rib 145 can be plastic parts with elasticity. In other embodiments, the bump 143 can also be an elastomer; the bump 143 can also be other block structures such as a triangle or a pentagon.

[0083] The number of the positioning bodies 14 is at least one. In this embodiment, the number of the positioning bodies 14 is two. The height dimensions of the two positioning bodies 14 (the distance between the end face of the first rib 144 of the positioning body 14 away from the bottom wall 134 of the accommodating groove 13 and the bottom wall 134 of the accommodating groove 13) are the same. The height dimension of the positioning body 14 protruding from the second surface 112 of the main body portion 11 is 0.3 mm - 1.0 mm. Specifically, it can be 0.3 mm, or 1.0 mm, or any value between 0.3 and 1.0. Along the width direction of the accommodating groove 13, the two positioning bodies 14 are respectively arranged on the opposite sides of the central axis of the accommodating groove 13 (the central axis refers to the bisector of the width of the accommodating groove 13 and extends along the length direction of the accommodating groove 13), and the perpendicular distances between the two positioning bodies 14 and the central axis of the accommodating groove 13 are equal. Along the length direction of the accommodating groove 13, the two positioning bodies 14 are arranged in a staggered manner; along the width direction of the accommodating groove 13, the two positioning bodies 14 are arranged in a staggered manner. In other embodiments, along the length direction or the width direction of the accommodating groove 13, the positioning bodies 14 can also be arranged in alignment.

[0084] Please continue to refer to Figure 8 , the insulating component 10 further includes a first clamping portion 151 and a second clamping portion 152. The first clamping portion 151 and the second clamping portion 152 are respectively arranged on two opposite side surfaces of the first groove side wall 131 and the third groove side wall 133, and the first clamping portion 151 and the second clamping portion 152 are close to the notch 135; it can be understood that the first clamping portion 151 and the second clamping portion 152 are located on the opposite sides of the notch 135 of the accommodating groove 13, and the first clamping portion 151 and the second clamping portion 152 are opposite in the direction of the first groove side wall 131 and the third groove side wall 133 being opposite. Along the thickness direction of the insulating component 10, there is a gap between the first clamping portion 151 and the second clamping portion 152 and the bottom wall 134 of the accommodating groove 13. In other embodiments, the first clamping portion 151 and the second clamping portion 152 can also be arranged in a staggered manner in the direction of the first groove side wall 131 and the third groove side wall 133 being opposite.

[0085] The first clamping portion 151 includes a first pressing body 1511 and a first abutting body 1512. The first pressing body 1511 protrudes from the side surface of the first groove side wall 131 facing the third groove side wall 133. Along the thickness direction of the insulating component 10, the first abutting body 1512 is spaced apart from the first pressing body 1511. One end of the first abutting body 1512 is fixed to the side surface of the first groove side wall 131, and the other end is connected to the free end of the first pressing body 1511. The first pressing body 1511 is inclined toward the bottom wall 134 of the accommodating groove 13. The first pressing body 1511 includes a first inclined surface that faces away from the bottom wall 134 of the accommodating groove 13 and is connected to the wall surface of the first groove side wall 131 of the accommodating groove 13 and is inclined toward the bottom wall 134 of the accommodating groove 13. Both the first pressing body 1511 and the first abutting body 1512 are elastic members; there is a gap between the first pressing body 1511 and the first abutting body 1512, that is, the first clamping portion 151 as a whole is a hollow structure, which can improve the elastic force of the first clamping portion 151. It can be understood that the first clamping portion 151 has a cavity and the first clamping portion 151 is a hollow structure. The oblique design and the hollow design of the first clamping portion 151 can make it more labor-saving when pressing down the first clamping portion 151. The first abutting body 1512 can support the first pressing body 1511 to prevent the first pressing body 1511 from deforming after repeated use and affecting the repeated use of the first clamping portion 151. In this embodiment, the first pressing body 1511 and the first abutting body 1512 are integrally formed. In other embodiments, the first clamping portion 151 can also be a separate structural member, that is, the first clamping portion 151 can be a triangular block.

[0086] The second clamping portion 152 includes a second pressing body 1521 and a second abutting body 1522. The second pressing body 1521 protrudes from the side surface of the third groove side wall 133 facing the first groove side wall 131. Along the thickness direction of the insulating member 10, the second abutting body 1522 and the second pressing body 1521 are spaced apart. One end of the second abutting body 1522 is fixed to the side surface of the third groove side wall 133, and the other end is connected to the free end of the second pressing body 1521, and the second pressing body 1521 is inclined toward the bottom wall 134 of the accommodating groove 13. The second pressing body 1521 includes a second inclined surface, the second inclined surface faces away from the bottom wall 134 of the accommodating groove 13, and the second inclined surface is connected to the wall surface of the third groove side wall 133 of the accommodating groove 13 and is inclined toward the bottom wall 134 of the accommodating groove 13. Both the second pressing body 1521 and the second abutting body 1522 are elastic members; there is a gap between the second pressing body 1521 and the second abutting body 1522, which can enhance the elastic force of the second clamping portion 152. It can be understood that the second clamping portion 152 has a cavity, and the second clamping portion 152 is a hollow structure. The oblique design and the hollow design of the second clamping portion 152 can make it more labor-saving when pressing the second clamping portion 152 downward. The second abutting body 1522 can support the second pressing body 1521 to prevent the second pressing body 1521 from deforming after repeated use and affecting the repeated use of the second clamping portion 152. In this embodiment, the second pressing body 1521 and the second abutting body 1522 are integrally formed. In other embodiments, the second clamping portion 152 may also be a separate structural member, that is, the second clamping portion 152 may be a triangular block.

[0087] Please refer to Figure 11 , Figure 11 is Figure 3 a schematic cross-sectional view of the end cap assembly shown. The insulating member 10 is stacked on the second mounting surface 214 of the top cover 20. The first surface 111 of the insulating member 10 and the second mounting surface 214 of the top cover 20 are opposite and fit together. Along the thickness direction of the end cap assembly 100, the pole through hole 114 of the insulating member 10 and the pole hole 211 of the top cover 20 are coaxially arranged and communicate with each other. Along the thickness direction of the end cap assembly 100, the ventilation groove 115 of the insulating member 10 and the through groove 215 of the top cover 20 are oppositely arranged and communicate with each other; the orthographic projection of the through groove 215 of the top cover 20 on the main body portion 11 falls within the orthographic projection of the ventilation groove 115 on the main body portion 11. Along the thickness direction of the end cap assembly 100, the liquid injection through groove 116 of the insulating member 10 and the liquid injection hole 212 of the top cover 20 are oppositely arranged and communicate with each other; the orthographic projection of the liquid injection hole 212 of the top cover 20 on the main body portion 11 falls within the orthographic projection of the liquid injection through groove 116 on the main body portion 11.

[0088] It can be understood that during the transportation of the energy storage device 1000, the tab or the separator membrane is likely to break and generate debris. The bottom wall 1151 of the ventilation groove 115 can prevent the debris of the tab or the separator membrane from floating below the explosion-proof valve 22, avoiding blocking the gas passage and thus causing explosion-proof failure. The bottom wall 1161 of the liquid injection through groove 116 can prevent the debris of the tab or the separator membrane from floating below the liquid injection hole 212, avoiding blocking the liquid injection hole 212 and thus affecting the liquid injection process.

[0089] Please refer to Figure 12 and Figure 13 , Figure 12 is Figure 2 a schematic structural diagram of the current collector plate shown, Figure 13 is Figure 12 a schematic structural diagram of the current collector plate from another angle shown. The current collector plate 200 includes a plate body part 40, a connecting part 50, and an extending part 60. The plate body part 40 is used for fixedly connecting with the tab 320 of the electrode assembly 300, and the extending part 60 is used for fixedly connecting with the pole column of the end cover assembly 100. The connecting part 50 is connected between the plate body part 40 and the extending part 60. By bending the connecting part 50, the plate body part 40 can be bent relative to the extending part 60. In this embodiment, the current collector plate 200 is an overall sheet-like structure.

[0090] The plate body part 40 includes a body 41 and a welding protrusion 42. The body 41 is disc-shaped. Along the thickness direction of the body 41, the body 41 includes a third surface 411 and a fourth surface 412 which are arranged opposite to each other. The welding protrusion 42 is arranged on the body 41.

[0091] The welding protrusion 42 protrudes from the third surface 411 of the body 41. The welding protrusion 42 is generally in the shape of a long strip plate and extends along the radial direction of the body 41. In this embodiment, the number of welding protrusions 42 is 4 and they are circumferentially distributed around the center of the body 41; the adjacent two welding protrusions 42 are spaced at an angular interval of 90° on the body 41. The welding protrusion 42 is used for welding with the tab 320 of the electrode assembly 300, that is, the tab 320 of the electrode assembly 300 is connected to the current collector plate 200 through the welding protrusion 42.

[0092] The body 41 is provided with an electrolyte hole 413 and a groove 414. The electrolyte hole 413 is located at the middle position of the body 41. Along the thickness direction of the body 41, the electrolyte hole 413 penetrates through the third surface 411 and the fourth surface 412 of the body 41. The electrolyte hole 413 is used for allowing the electrolyte to flow into the electrode assembly 300 during the liquid injection process.

[0093] The groove 414 is recessed in the fourth surface 412 of the body 41. In this embodiment, the groove 414 is generally elongated and extends along the radial direction of the body 41; the number of the grooves 414 is 4, and they are circumferentially distributed around the center of the body 41; the adjacent two grooves 414 are spaced at an angular interval of 90° on the body 41. Along the thickness direction of the body 41, the 4 welding protrusions 42 are respectively opposite to the positions where the 4 grooves 414 are located, that is, along the thickness direction of the disk body part 40, the orthographic projection of the welding protrusion 42 on the body 41 at least partially coincides with the orthographic projection of the groove 414 on the body 41.

[0094] It can be understood that by providing the groove 414 on the body 41 and making the groove 414 and the welding protrusion 42 opposite to each other along the thickness direction of the body 41, on the one hand, the combination of the groove 414 and the welding protrusion 42 has little influence on the overall strength of the disk body part 40, and on the other hand, providing the groove 414 can reduce the production materials for producing the disk body part 40, which is beneficial to reducing the production cost and weight of the current collector disk 200.

[0095] The connecting part 50 is generally a rectangular thin plate. One end of the connecting part 50 is connected to the circumferential surface of the body 41, and the other end is connected to the end of the extending part 60. In this embodiment, the connecting part 50 is made of a flexible material. It can be understood that the connecting part 50 is connected between the body 41 of the disk body part 40 and the extending part 60, and the extending direction of the extending part 60 is the same as that of the connecting part 50.

[0096] The extending part 60 is generally a rectangular thin plate. The extending part 60 is formed by extending from the side of the connecting part 50 away from the body 41. In this embodiment, the extending direction of the extending part 60 is the same as the extending direction of one welding protrusion 42.

[0097] In the thickness direction of the extension part 60, the extension part 60 includes a fifth surface 61 and a sixth surface 62 which are arranged opposite to each other. A positioning hole 63 is provided on the extension part 60. In the thickness direction of the extension part 60, the positioning hole 63 penetrates through the fifth surface 61 and the sixth surface 62 of the extension part 60. The number of the positioning holes 63 is at least one. In this embodiment, the number of the positioning holes 63 is two. In the width direction of the extension part 60, the two positioning holes 63 are respectively arranged on the opposite sides of the central axis of the extension part 60 (the central axis refers to the bisector of the width of the extension part 60 and extends along the length direction of the extension part 60), and the perpendicular distances between the two positioning holes 63 and the central axis of the extension part 60 are equal. In the length direction of the extension part 60, the two positioning holes 63 are arranged in a staggered manner; in the width direction of the extension part 60, the two positioning holes 63 are arranged in a staggered manner. In the width direction of the extension part 60, on the opposite sides of the central axis of the extension part 60, the distances between the two positioning holes 63 and the nearest side of the extension part 60 are equal. The distance between the positioning hole 63 and the nearest side of the extension part 60 is d, and the value range of d is 3.0 mm - 5.0 mm. Specifically, the value of d can be 3.0 mm, or 5.0 mm, or any value between 3.0 and 5.0. The shape of the positioning hole 63 is circular, the aperture of the positioning hole 63 is larger than the diameter of the positioning body 14 of the insulating component 10, and the difference between the aperture of the positioning hole 63 and the diameter of the positioning body 14 is 0.5 mm - 1.0 mm. Specifically, it can be 0.5 mm, or 1.0 mm, or any value between 0.5 and 1.0. In other embodiments, the positioning hole 63 can also be other shapes, such as rectangular, triangular, rhombic, etc.

[0098] A first notch 64 and a second notch 65 are also provided on the extension part 60. In the width direction of the extension part 60, the first notch 64 and the second notch 65 are located on the opposite sides of the end of the extension part 60 connected to the connecting part 50. In the thickness direction of the extension part 60, the first notch 64 and the second notch 65 penetrate through the fifth surface 61 and the sixth surface 62 of the extension part 60.

[0099] Please refer to Figure 14 and Figure 15 , Figure 14 is Figure 2 a schematic diagram of the assembly process of the end cover assembly of the energy storage device shown, where the current collector plate is in an unfolded state; Figure 15 is Figure 14 a schematic diagram of the assembly of the end cover assembly of the energy storage device shown, where the current collector plate is in a folded state.

[0100] The extension portion 60 of the current collecting plate 200 is accommodated in the receiving groove 13 of the insulating component 10. Along the thickness direction of the insulating component 10, the positioning body 14 in the receiving groove 13 of the insulating component 10 is penetrated by the positioning hole 63 of the extension portion 60 of the current collecting plate 200, and the first notch 64 and the second notch 65 of the extension portion 60 of the current collecting plate 200 are respectively opposite to the first clamping portion 151 and the second clamping portion 152 of the insulating component 10. Specifically, along the thickness direction of the insulating component 10, the first clamping portion 151 is opposite to the first notch 64, and the second clamping portion 152 is opposite to the second notch 65. In the thickness direction of the insulating component 10 and toward the second surface 112, the first clamping portion 151 partially passes through the first notch 64, and the second clamping portion 152 partially passes through the second notch 65, until the first clamping portion 151 and the second clamping portion 152 press against the extension portion 60 for clamping, specifically, against the edge of the first notch 64 and the second notch 65; in this process, the extension portion 60 pushes against the first inclined surface of the first clamping portion 151 and the second inclined surface of the second clamping portion 152. The first clamping portion 151 and the second clamping portion 152 are deformed to facilitate the passage of the extension portion 60. It can be understood that, along the thickness direction of the insulating component 10, the first clamping portion 151 and the bottom wall 134 of the accommodating groove 13 limit (clamp) the extension portion 60 of the collecting plate 200, and the extension portion 60 is limited to the gap between the first clamping portion 151 and the bottom wall 134 of the accommodating groove 13; the second clamping portion 152 and the bottom wall 134 of the accommodating groove 13 limit (clamp) the extension portion 60 of the collecting plate 200, and the extension portion 60 is limited to the gap between the second clamping portion 152 and the bottom wall 134 of the accommodating groove 13. After the extension portion 60 of the collecting plate 200 is installed in the receiving groove 13, the first clamping portion 151 and the second clamping portion 152 can prevent the extension portion 60 of the collecting plate 200 from escaping from the receiving groove 13; at the same time, by setting the first notch 64 and the second notch 65, the extension portion 60 of the collecting plate 200 partially avoids the first clamping portion 151 and the second clamping portion 152, so that the extension portion 60 of the collecting plate 200 can be clamped into the receiving groove 13 more easily.

[0101] When the extension part 60 of the current collector plate 200 is assembled to the insulating component 10, the positioning body 14 in the accommodation groove 13 of the insulating component 10 can limit the extension part 60 of the current collector plate 200; during the process of bending the current collector plate 200, the positioning body 14 can prevent the current collector plate 200 from being misaligned and shaking, and the positioning body 14 can limit the degree to which the extension part 60 of the current collector plate 200 is driven to tilt upward due to the bending operation of the current collector plate 200 within the maximum range. In addition, since the aperture of the positioning hole 63 of the extension part 60 of the current collector plate 200 is larger than the diameter of the positioning body 14 of the insulating component 10, and the difference between the aperture of the positioning hole 63 and the diameter of the positioning body 14 is 0.5 mm - 1.0 mm, a certain assembly gap is reserved in the positioning hole 63 of the extension part 60, facilitating the positioning body 14 of the insulating component 10 to pass through the positioning hole 63 of the extension part 60. Additionally, a chamfer is provided at the end of the positioning body 14, which can prevent the end face of the positioning body 14 from scratching the extension part 60 of the current collector plate 200 when the positioning body 14 is inserted into the positioning hole 63 of the extension part 60 of the current collector plate 200, and also facilitates the positioning body 14 of the insulating component 10 to pass through the positioning hole 63 of the extension part 60.

[0102] Along the length direction of the accommodation groove 13, the positioning bodies 14 on the insulating component 10 are arranged in a staggered manner, and the positioning holes 63 of the extension part 60 of the current collector plate 200 are also arranged in a corresponding staggered manner. On the one hand, it can avoid the stress concentration around the positioning hole 63 caused by the tensile force when the extension part 60 of the current collector plate 200 is driven to tilt away from the accommodation groove 13 due to the bending operation of the current collector plate 200, thereby avoiding the extension part 60 of the current collector plate 200 from being prone to cracking and breaking at the positioning hole 63 during the bending process, which affects the lifespan of the energy storage device 1000. On the other hand, it has a certain anti-mistake function. Only when the staggered positioning body 14 and the staggered positioning hole 63 are in one-to-one corresponding positions can it be ensured that the third surface 411 of the current collector plate 200 provided with the welding protrusion 42 faces the direction of the pole ear 320, preventing the current collector plate 200 from being placed in the wrong direction and resulting in the inability to weld with the fallen pole ear.

[0103] Through the connecting portion 50 of the bent current collector plate 200, the plate body portion 40 can be bent relative to the extending portion 60. Along the thickness direction of the insulating member 10, the plate body portion 40 covers the second surface 112 of the main body portion 11, and the extending portion 60 is located between the plate body portion 40 and the main body portion 11. Since the height dimension of the positioning body 14 protruding from the second surface 112 of the main body portion 11 is 0.3 mm - 1.0 mm, the plate body portion 40 abuts against the positioning body 14 of the insulating member 10. Since the plate body portion 40 abuts against the positioning body 14 of the insulating member 10 and the positioning body 14 has elasticity, when the energy storage device 1000 is subjected to an external impact or accidental drop, the positioning body 14 can buffer the plate body portion 40, thereby buffering the vibration of the plate body portion 40, avoiding the fracture of the connecting portion 50 of the current collector plate 200 caused by the vibration of the plate body portion 40, and improving the connection stability between the plate body portion 40 and the ear 320 of the electrode assembly 300, thereby enhancing the overall structural stability of the energy storage device 1000. It should be noted that in this embodiment, along the thickness direction of the insulating member 10, the orthographic projection of the plate body portion 40 is located within the orthographic projection of the insulating member 10. The area of the plate body portion 40 is smaller than the area of the second surface 112, and the plate body portion 40 covers most of the area of the second surface 112, rather than completely covering the second surface 112.

[0104] By limiting the maximum value of the height dimension of the positioning body 14 protruding from the second surface 112 to 1.0 mm, it is possible to avoid deformation of the plate body portion 40 after abutting against the positioning body 14 due to the excessive height of the positioning body 14, and improve the service life of the energy storage device 1000; by limiting the minimum value of the height dimension of the positioning body 14 protruding from the second surface 112 to 0.3 mm, it can be ensured that after the energy storage device 1000 is assembled, under the combined action of the end cover assembly 100 and the electrode assembly 300, the plate body portion 40 can abut against the positioning body 14; in addition, it can also avoid excessive bending of the current collector plate 200 resulting in fracture of the current collector plate 200.

[0105] Along the width direction of the receiving groove 13, the distance between the positioning body 14 and the central axis of the receiving groove 13 is equal. When the plate body portion 40 of the current collector plate 200 abuts against the positioning body 14, along the width direction of the extending portion 60, the acting forces on the opposite sides of the extending portion 60 of the current collector plate 200 and the positioning body 14 are the same, so the acting forces on the opposite sides of the extending portion 60 are relatively uniform.

[0106] Please refer to Figure 16 , Figure 16 For Figure 2 the current collector plate shown and Figure 9Schematic diagram of the assembly structure of the insulating component of the second embodiment shown. In order to assemble with the positioning body 14 of the insulating component 10 of the second embodiment, the positioning hole 63 on the extension portion 60 of the current collector plate 200 may also be quadrilateral. The extension portion 60 is received in the receiving groove 13 of the insulating component 10, and the positioning body 14 of the insulating component 10 passes through the positioning hole 63 of the extension portion 60.

[0107] Specifically, the extension portion 60 is sleeved on the boss 141 of the positioning body 14 through the positioning hole 63, and the boss 141 passes through the positioning hole 63. At this time, the extension portion 60 is located in the receiving groove 13, and the extension portion 60 and the disk body portion 40 are in an initial unfolded state. The disk body portion 40 drives the connecting portion 50 to bend relative to the extension portion 60, and the bending force between the connecting portion 50 and the extension portion 60 will drive the extension portion 60 to tilt away from the receiving groove 13. Since the positioning body 14 is a plastic part and the current collector plate 200 is made of metal, during the tilting process of the extension portion 60, the edge of the positioning hole 63 of the extension portion 60 will squeeze the boss 141 of the positioning body 14; since the diameter of the boss 141 of the positioning body 14 is larger than the diameter of the cylinder 142, a frictional force will be generated on the periphery of the positioning hole 63, and the strength of the boss 141 of the positioning body 14 is greater than the strength of the cylinder 142, which can avoid large deformation of the boss 141 under the extrusion of the edge of the positioning hole 63 or even being broken by the edge of the positioning hole 63. At this time, the cylinder 142 of the positioning body 14 is in a natural state. When the disk body portion 40 is stacked on the side of the extension portion 60 facing away from the insulating component 10 after being bent, the disk body portion 40 abuts against the end of the cylinder 142 of the positioning body 14 away from the boss 141. When the disk body portion 40 vibrates due to the energy storage device 1000 being externally impacted or accidentally dropped, the free end of the cylinder 142 of the positioning body 14 undergoes elastic deformation, playing a buffering role in the vibration of the disk body portion 40. The positioning body 14 of this embodiment includes a bent cylinder 142, that is, the free end of the cylinder 142 is in a bent state. When the positioning body 14 is subjected to a force applied by the disk body portion 40 in the direction of the boss 141, the deformable space of the cylinder 142 of the positioning body 14 is relatively large, so the amplitude of elastic deformation of the cylinder 142 of the positioning body 14 is relatively large, and the positioning body 14 is more likely to absorb impact and vibration, thereby buffering the vibration of the disk body portion 40. Therefore, the buffering effect of the positioning body 14 on the vibration of the disk body portion 40 is more obvious.

[0108] Please refer to Figure 17 , Figure 17 For Figure 2 the current collector plate shown and Figure 10Schematic diagram of the assembly structure of the insulating component of the third embodiment shown. In order to assemble with the positioning body 14 of the insulating component 10 of the third embodiment, the positioning hole 63 on the extension portion 60 of the current collector plate 200 can also be quadrilateral. The extension portion 60 is accommodated in the accommodation groove 13 of the insulating component 10, and the positioning body 14 of the insulating component 10 passes through the positioning hole 63 of the extension portion 60. Specifically, the extension portion 60 is sleeved on the convex block 143 of the positioning body 14 through the positioning hole 63, and the convex block 143 passes through the positioning hole 63.

[0109] Specifically, the extension portion 60 is sleeved on the convex block 143 of the positioning body 14 through the positioning hole 63, and the convex block 143 passes through the positioning hole 63. At this time, the extension portion 60 is located in the accommodation groove 13, and the extension portion 60 and the disk body portion 40 are in an initial unfolded state. The disk body portion 40 drives the connecting portion 50 to bend relative to the extension portion 60, and the bending force between the connecting portion 50 and the extension portion 60 will drive the extension portion 60 to tilt away from the accommodation groove 13. Since the positioning body 14 is a plastic part and the current collector plate 200 is made of metal, during the tilting process of the extension portion 60, the edge of the positioning hole 63 of the extension portion 60 will squeeze the convex block 143 of the positioning body 14. Since the diameter of the convex block 143 of the positioning body 14 is larger than the diameters of the first convex rib 144 and the second convex rib 145, a frictional force will be generated on the periphery of the positioning hole 63, and the strength of the convex block 143 of the positioning body 14 is greater than the strengths of the first convex rib 144 and the second convex rib 145, which can prevent the convex block 143 from being greatly deformed or even broken by the edge of the positioning hole 63. At this time, the first convex rib 144 and the second convex rib 145 of the positioning body 14 are in a natural state. When the disk body portion 40 is stacked on the side of the extension portion 60 facing away from the insulating component 10 after being bent, the disk body portion 40 abuts against the end of the first convex rib 144 of the positioning body 14 away from the convex block 143. The positioning body 14 of this embodiment includes a first convex rib 144 and a second convex rib 145. Along the thickness direction of the insulating component 10, the second convex rib 145 is located between the first convex rib 144 and the convex block 143, and the orthographic projection of the first convex rib 144 on the insulating component 10 at least partially overlaps with the orthographic projection of the second convex rib 145 on the insulating component 10. When the disk body portion 40 vibrates due to the energy storage device 1000 being externally impacted or accidentally dropped, the positioning body 14 receives a force applied by the disk body portion 40 in the direction towards the convex block 143, and the free end of the first convex rib 144 undergoes elastic deformation, buffering the vibration of the disk body portion 40; at the same time, the first convex rib 144 deforms towards the convex block 143, and the second convex rib 145 abuts against the first convex rib 144, and the second convex rib 145 can also undergo elastic deformation, buffering the vibration of the first convex rib 144. Since both the first convex rib 144 and the second convex rib 145 can play a buffering role, the positioning body 14 is more likely to absorb impact and vibration, thereby buffering the vibration of the disk body portion 40. Therefore, the buffering effect of the positioning body 14 on the vibration of the disk body portion 40 is more obvious.

[0110] See also Figure 18 , Figure 18 for Figure 2 The schematic diagram of partial structural decomposition of the energy storage device shown. The end cover assembly 100 also includes an upper plastic 30, a pressing block 70, a pole 80 and a sealing ring 90. Specifically, the upper plastic 30 and the top cover 20 are stacked, and the upper plastic 30 is located on the side of the top cover 20 away from the insulating component 10. A through hole 31 is provided on the upper plastic 30 for the pole 80 to pass through. The pressing block 70 is stacked on the side of the upper plastic 30 away from the top cover 20, and is fixedly connected to the upper plastic 30. Among them, the pole 80 includes a pole column 81 and a flange portion 82. Along the thickness direction of the end cover assembly 100, the column 81 of the pole 80 is sequentially penetrated through the pole through hole 114 of the insulating component 10, the pole hole 211 of the top cover 20, and the through hole 31 of the upper plastic 30, and is fixedly connected to the pressing block 70. The flange portion 82 of the pole 80 is crimped to the second surface 112 of the insulating component 10. The end cap assembly 100 and the electrode assembly 300 are connected through the current collecting disk 200, and the current collecting disk 200 is located between the end cap assembly 100 and the electrode assembly 300. The extension portion 60 of the current collecting disk 200 is accommodated in the accommodating groove 13 of the insulating component 10, and the extension portion 60 of the current collecting disk 200 is fixedly connected to the flange portion 82 of the pole 80. The disk body 40 of the current collecting disk 200 is fixedly connected to the pole ear 320 of the electrode assembly 300. The sealing ring 90 is assembled on the pole column 81 of the pole 80 near the end of the flange portion 82. In this embodiment, the extension portion 60 of the current collecting disk 200 is connected to the flange portion 82 of the pole 80 by welding, and the disk body 40 of the current collecting disk 200 is connected to the pole ear 320 of the electrode assembly 300 by welding.

[0111] The assembly process of the energy storage device 1000 provided in the embodiment of the present application is as follows: first, the end cap assembly 100, the electrode assembly 300, the current collecting plate 200 and the shell 400 are respectively manufactured; secondly, the extension portion 60 of the current collecting plate 200 is clamped in the accommodating groove 13 through the first clamping portion 151 and the second clamping portion 152 of the insulating component 10, and the end of the extension portion 60 of the current collecting plate 200 is welded and fixed to the flange portion 82 of the pole 80; thirdly, the disc body 40 of the current collecting plate 200 is welded and fixed to the pole ear 320 of the electrode assembly 300. Afterwards, bend the connecting portion 50 of the collecting disk 200 so that the disk body 40 of the collecting disk 200 is overlapped on the side of the extending portion 60 of the collecting disk 200 facing away from the insulating component 10, and the disk body 40 of the collecting disk 200 abuts against the end of the positioning body 14, and the end cover assembly 100 and the electrode assembly 300 are basically coaxial; finally, put the electrode assembly 300 into the shell 400, so that the end cover assembly 100 covers the opening of the shell 400 and seals it, and the disk body 40 of the collecting disk 200 is connected to the electrode assembly 300 through the opening.

[0112] It can be understood that after the extension portion 60 of the current collector plate 200 is connected to the pole column 80 of the end cap assembly 100 and the disk body portion 40 of the current collector plate 200 is connected to the tab 320 of the electrode assembly 300, the bending process of the current collector plate 200 can make the extension portion 60 and the disk body portion 40 partially overlap along the height direction of the energy storage device 1000. Compared with the extension portion 60 and the disk body portion 40 being in the same plane, the occupied space of the current collector plate 200 inside the energy storage device 1000 can be reduced, the space utilization rate of the energy storage device 1000 can be improved, and thus the energy density of the energy storage device 1000 can be further improved. Since the bent disk body portion 40 abuts against the end of the positioning body 14 and the positioning body 14 is an elastic body, when the energy storage device 1000 collides or drops, the positioning body 14 can buffer the vibration of the disk body portion 40, avoid the connection portion 50 of the current collector plate 200 from breaking due to the vibration of the disk body portion 40, and can improve the connection stability between the disk body portion 40 and the tab 320 of the electrode assembly 300, thereby improving the overall structural stability of the energy storage device 1000. Through the mutual cooperation between the positioning body 14 on the insulating member 10 and the positioning hole 63 of the extension portion 60 of the current collector plate 200, the positioning body 14 of the insulating member 10 can limit the extension portion 60 of the current collector plate 200; at the same time, during the bending process of the current collector plate 200, the positioning body 14 of the insulating member 10 can limit the degree to which the extension portion 60 of the current collector plate 200 is driven to tilt upward due to the bending operation, thereby avoiding the end of the extension portion 60 of the current collector plate 200 from breaking at the welding edge of the flange portion 82 of the pole column 80, so as to ensure the connection reliability between the end of the extension portion 60 of the current collector plate 200 and the flange portion 82 of the pole column 80, make the bending process faster and more labor-saving, and further improve the yield and efficiency of mass production.

[0113] The embodiments of the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. An end cover assembly is applied to an energy storage device (1000). The energy storage device (1000) includes a current collector plate (200) and an electrode assembly (300). The current collector plate (200) includes an extension portion (60) and a plate body portion (40). The extension portion (60) is connected to one side of the plate body portion (40) and extends away from the plate body portion (40). It is characterized in that a positioning hole (63) is provided on the extension portion (60), and in the thickness direction of the extension portion (60), the positioning hole (63) penetrates through the extension portion (60); the end cover assembly (100) includes an insulating component (10). The insulating component (10) includes a body portion (11). The body portion (11) has a first surface (111) and a second surface (112), and the first surface (111) and the second surface (112) are arranged opposite to each other. the insulating component (10) further includes a receiving groove (13), and the receiving groove (13) is recessed in the second surface (112). the insulating component (10) further includes at least one positioning body (14). The at least one positioning body (14) protrudes from the bottom wall (134) of the receiving groove (13). Along the thickness direction of the body portion (11), the at least one positioning body (14) protrudes from the second surface (112) and the positioning body (14) has elasticity. the extension portion (60) is received in the receiving groove (13), and each positioning body (14) passes through one positioning hole (63); the plate body portion (40) is bent relative to the extension portion (60) so that in the thickness direction of the insulating component (10), the plate body portion (40) covers the second surface, and the plate body portion (40) abuts against the positioning body (14). the end cover assembly (100) is connected to the electrode assembly (300). The current collector plate (200) is located between the end cover assembly (100) and the electrode assembly (300), and the plate body portion (40) is connected to the electrode assembly (300).

2. The end cap assembly according to claim 1, characterized in that the number of the positioning bodies (14) is two, and the heights of the two positioning bodies (14) are the same. The receiving groove (13) has a central axis extending along the length direction of the receiving groove (13). The two positioning bodies (14) are respectively arranged on opposite sides of the central axis of the receiving groove (13), and the perpendicular distances from the two positioning bodies (14) to the central axis of the receiving groove (13) are equal.

3. The end cap assembly according to claim 2, wherein, along the length direction of the receiving groove (13), the two positioning bodies (14) are arranged in a staggered manner.

4. The end cap assembly according to claim 1, characterized in that, the height by which the positioning body (14) protrudes from the second surface (112) is 0.3 mm - 1.0 mm.

5. The end cap assembly according to any one of claims 1-4, characterized in that the positioning body (14) includes an end face away from the receiving groove (13) and a peripheral side face connected to the end face. A chamfer is formed at the connection between the end face of the positioning body (14) and the peripheral side face of the positioning body (14), and the chamfer is inclined from the end face of the positioning body (14) towards the peripheral side face of the positioning body (14).

6. The end cap assembly according to any one of claims 1-4, characterized in that, The positioning body (14) includes a boss (141) and a column (142). The boss (141) protrudes from the bottom wall (134) of the accommodation groove (13), and the column (142) protrudes from the surface of the boss (141) facing away from the bottom wall (134) of the accommodation groove (13) and extends in a direction away from the boss (141); the end of the column (142) away from the boss (141) is a bent end, and the column (142) is an elastic body; The disk portion (40) abuts against the end of the column (142) facing away from the boss (141), and the boss (141) passes through the positioning hole (63).

7. The end cap assembly according to any one of claims 1-4, characterized in that, The positioning body (14) includes a protrusion (143), a first rib (144) and a second rib (145). The protrusion (143) protrudes from the bottom wall (134) of the accommodation groove (13); the first rib (144) protrudes from the surface of the protrusion (143) facing away from the bottom wall (134) of the accommodation groove (13), and the second rib (145) protrudes from the surface of the protrusion (143) facing away from the bottom wall (134) of the accommodation groove (13). Along the thickness direction of the insulating component (10), the orthographic projection of the second rib (145) at least partially overlaps with the orthographic projection of the first rib (144), and the first rib (144) and the second rib (145) are elastic bodies; The disk portion (40) abuts against the end of the first rib (144) facing away from the protrusion (143), and the protrusion (143) passes through the positioning hole (63).

8. The end cap assembly according to claim 7, characterized in that, The end of the second rib (145) facing away from the protrusion (143) abuts against the first rib (144).

9. The end cap assembly according to claim 7, characterized in that, The insulating component (10) further includes a first clamping portion (151) and a second clamping portion (152). The first clamping portion (151) and the second clamping portion (152) are respectively arranged on two opposite side walls of the accommodation groove (13). There is a gap between the first clamping portion (151) and the second clamping portion (152) and the bottom wall (134) of the accommodation groove (13). Along the thickness direction of the end cover assembly (100), the extension portion (60) is limited in the gap between the first clamping portion (151) and the bottom wall (134) of the accommodation groove (13), and the gap between the second clamping portion (152) and the bottom wall (134) of the accommodation groove (13).

10. The end cap assembly according to claim 9, characterized in that, The body portion (11) includes a peripheral side surface (113) connecting the first surface (111) and the second surface (112). The peripheral side surface (113) has a notch (135). Along the length direction of the accommodation groove (13), the notch (135) communicates with the accommodation groove (13); the first clamping portion (151) and the second clamping portion (152) are located on opposite sides of the notch (135).

11. An energy storage device, characterized in that, It includes a housing (400), an electrode assembly (300), a current collector plate (200), and an end cap assembly (100) as described in any one of claims 1-10. The housing (400) has an opening, and the housing (400) is provided with a receiving cavity. The electrode assembly (300) is received in the receiving cavity. The end cap assembly (100) covers the opening, and the disk body portion (40) is connected to the electrode assembly (300).

12. The energy storage device according to claim 11, wherein, The current collector plate (200) further includes a connecting portion (50). The connecting portion (50) connects the disk body portion (40) and the extending portion (60). The connecting portion (50) is made of a flexible material. By bending the connecting portion (50), the disk body portion (40) can be bent relative to the extending portion (60).

13. The energy storage device according to claim 11, characterized in that, The aperture diameter of the positioning hole (63) is larger than the diameter of the positioning body (14). The difference between the aperture diameter of the positioning hole (63) and the diameter of the positioning body (14) is 0.5 mm - 1.0 mm.

14. The energy storage device according to claim 11, characterized in that, The number of the positioning holes (63) is two. The extending portion (60) has a central axis. The two positioning holes (63) are respectively arranged on the opposite sides of the central axis of the extending portion (60), and the perpendicular distances from the two positioning holes (63) to the central axis of the extending portion (60) are equal.

15. The energy storage device according to claim 11, characterized in that, Along the width direction of the extending portion (60), the perpendicular distance between the positioning hole (63) and the nearest side of the extending portion (60) is 3.0 mm - 5.0 mm.

16. An electrical device, characterized in that, It includes an energy storage device (1000) as described in any one of claims 11-15. The energy storage device (1000) is used to supply power to an electrical device.

17. A household energy storage system, characterized in that, It includes an energy storage device (1000) as described in any one of claims 11-15, a power conversion device (4000), and a user load. The energy storage device (1000) stores the electrical energy of the power conversion device (4000) and transmits the electrical energy to the user load.

Images