CN116169304A

CN116169304A - End cover assembly, energy storage device, electric equipment and household energy storage system

Info

Publication number: CN116169304A
Application number: CN202310331630.6A
Authority: CN
Inventors: 熊永锋
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-03-30
Filing date: 2023-03-30
Publication date: 2023-05-26

Abstract

The application discloses an end cover assembly, an energy storage device, electric equipment and a household energy storage system, wherein the end cover assembly is applied to the energy storage device, the energy storage device comprises a current collecting disc and an electrode assembly, the current collecting disc comprises an extending part and a disc body part, the extending part is connected with one side of the disc body part, a positioning hole is formed in the extending part, and the positioning hole penetrates through the extending part; the end cover assembly comprises an insulating part, the insulating part comprises a body part, the body part is provided with a first surface and a second surface which are oppositely arranged, the insulating part further comprises a containing groove, the insulating part further comprises a positioning body, the positioning body is convexly arranged on the groove bottom wall of the containing groove, the positioning body is convexly arranged on the second surface, and the positioning body has elasticity; the extension part is accommodated in the accommodating groove, and each positioning body penetrates through one positioning hole; the tray body is bent relative to the extension part, covers the second surface of the insulating part, and is abutted with the positioning body. The energy density of the energy storage device can be improved.

Description

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

Technical Field

The application relates to the technical field of energy storage, in particular to an end cover assembly, an energy storage device, electric equipment and a household energy storage system.

Background

Along with the gradual increase of the demand of the secondary energy storage device, the performance requirements of people on all aspects of the secondary energy storage device are higher and higher, especially the requirement on the cycle performance of the energy storage device, and the energy density of the energy storage device is an important parameter for ensuring the cycle performance of the energy storage device, and the energy density per unit volume is too low, so that the capacity of the energy storage device is low and the cycle performance is poor. The existing cylindrical lithium ion energy storage device is also a secondary energy storage device and consists of an end cover assembly, a current collecting disc, an electrode assembly and a cylindrical shell, wherein the electrode post of the end cover assembly and the electrode lug of the electrode assembly are connected through the current collecting disc. Because the current collecting disc is mostly straight, the connection part of the current collecting disc and the pole and the connection part of the current collecting disc and the pole lug are on the same plane, the current collecting disc occupies a larger space in the secondary energy storage device, and in the same volume, the space occupied by the electrode assembly is smaller, so that the energy density of the secondary energy storage device is restricted.

Disclosure of Invention

The application provides an end cover assembly, can solve the mass flow disk and occupy great clearance, lead to secondary energy storage device energy density to be restricted at secondary energy storage device inside technical problem.

An end cap assembly for an energy storage device, the energy storage device comprising a current collecting tray and an electrode assembly, the current collecting tray comprising an extension and a tray body, the extension being connected to one side of the tray body and extending away from the tray body;

The extending part is provided with a positioning hole, and the positioning hole penetrates through the extending part in the thickness direction of the extending part;

the end cap assembly includes an insulating member including a body portion having a first surface and a second surface, the first surface and the second surface being disposed opposite one another,

the insulating part also comprises a containing groove which is concavely arranged on the second surface,

the insulating part further comprises at least one positioning body, the at least one positioning body is convexly arranged on the bottom wall of the accommodating groove, and along the thickness direction of the body part, the at least one positioning body is convexly arranged on the second surface and has elasticity;

the extension part is accommodated in the accommodating groove, and each positioning body is penetrated in one positioning hole; the tray body is bent relative to the extension part so that the tray body covers the second surface in the thickness direction of the insulating part, and the tray body is abutted with the positioning body;

the end cover assembly is connected with the electrode assembly, the current collecting disc is positioned between the end cover assembly and the electrode assembly, and the disc body is connected with the electrode assembly.

In a possible implementation manner, the number of the positioning bodies is two, the heights of the two positioning bodies are the same, the accommodating groove is provided with a central axis extending along the length direction of the accommodating groove, the two positioning bodies are respectively arranged on two opposite sides of the central axis of the accommodating groove, and the vertical distances between the two positioning bodies and the central axis of the accommodating groove are equal.

In one possible implementation manner, along the length direction of the accommodating groove, two positioning bodies are arranged in a staggered manner.

In a possible embodiment, the height of the positioning body protruding from the second surface is 0.3mm-1.0mm.

In a possible implementation manner, the positioning body comprises an end face far away from the accommodating groove and a peripheral side face connected with the end face, a chamfer is formed at the joint of the end face of the positioning body and the peripheral side face of the positioning body, and the chamfer is obliquely arranged from the end face of the positioning body to the peripheral side face direction of the positioning body.

In a possible implementation manner, the positioning body comprises a boss and a column body, the boss is convexly arranged on the bottom wall of the accommodating groove, and the column body is convexly arranged on the surface of the boss, which is opposite to the bottom wall of the accommodating groove, and extends in a direction away from the boss; the end part of the cylinder, which is far away from the boss, is a bending end, and the cylinder is an elastomer;

The tray body is abutted with the end part of the column body, which is opposite to the boss, and the boss penetrates through the positioning hole.

In a possible implementation manner, the positioning body comprises a protruding block, a first protruding rib and a second protruding rib, and the protruding block is protruding to the bottom wall of the accommodating groove; the first convex rib is convexly arranged on the surface of the convex block, which is opposite to the bottom wall of the accommodating groove, and the second convex rib is convexly arranged on the surface of the convex block, which is opposite to the bottom wall of the accommodating groove, and the orthographic projection of the second convex rib is at least partially overlapped with the orthographic projection of the first convex rib along the thickness direction of the insulating part, and the first convex rib and the second convex rib are elastic bodies;

the tray body is abutted with the end part of the first convex rib, which is opposite to the convex block, and the convex block penetrates through the positioning hole.

In a possible embodiment, an end of the second rib facing away from the bump abuts against the first rib.

In a possible implementation manner, the insulation component further comprises a first clamping portion and a second clamping portion, the first clamping portion and the second clamping portion are respectively arranged on two opposite groove side walls of the accommodating groove, a gap is formed between the first clamping portion and the second clamping portion and between groove bottom walls of the accommodating groove, and the extension portion is limited in the gap between the first clamping portion and the groove bottom wall of the accommodating groove and between the second clamping portion and the groove bottom wall of the accommodating groove along the thickness direction of the end cover component.

In a possible embodiment, the body portion includes a peripheral side surface connecting between the first surface and the second surface, the peripheral side surface having a notch, the notch communicating with the accommodation groove along a length direction of the accommodation groove; the first clamping part and the second clamping part are positioned on two opposite sides of the notch.

The application provides an energy storage device, including casing, electrode assembly, current collecting disc and end cover subassembly as described above, the casing has the opening, the casing is equipped with and holds the chamber, electrode assembly hold in hold the intracavity, end cover subassembly covers the opening, disk body portion connect in electrode assembly.

In a possible implementation manner, the current collecting disc further comprises a connecting part, the connecting part connects the disc body part and the extension part, the connecting part is made of flexible materials, and the disc body part can be bent relative to the extension part by bending the connecting part.

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 0.5mm-1.0mm.

In one possible implementation manner, the number of the positioning holes is two, the extending portion has a central axis, the two positioning holes are respectively arranged on two opposite sides of the central axis of the extending portion, and the vertical distances between the two positioning holes and the central axis of the extending portion are equal.

In a possible embodiment, the vertical distance between the positioning hole and the nearest side edge of the extension part is 3.0mm-5.0mm along the width direction of the extension part.

The application also provides electric equipment, which comprises the energy storage device, wherein the energy storage device is used for supplying power to the electric equipment.

The application also provides a household energy storage system comprising the energy storage device, the electric energy conversion device and the user load, wherein the energy storage device stores the electric energy of the electric energy conversion device and transmits the electric energy to the user load.

According to the energy storage device, the collecting disc is subjected to bending treatment, the disc body of the collecting disc is overlapped on one side of the extending part, which is opposite to the insulating part, and compared with the extending part and the disc body which are located on the same plane, the occupied space of the collecting disc in the energy storage device can be reduced, the space utilization rate of the energy storage device is improved, and the energy density of the energy storage device is further improved. Because the disk body portion after buckling and the tip butt of locating body, and the locating body is the elastomer, when energy memory bumps or falls, the locating body can play the cushioning effect to the vibrations of disk body portion, avoids the vibrations of disk body portion to lead to the connecting portion of mass flow disk to take place to fracture to can improve the connection stability of disk body portion and electrode assembly's utmost point ear, and then promote energy memory's overall structure stability. The positioning body of the insulating part can limit the extension part of the current collecting disc through the mutual matching of the positioning body on the insulating part and the positioning hole of the extension part of the current collecting disc; meanwhile, in the bending process of the current collecting disc, the positioning body of the insulating part can limit the degree that the extending part of the current collecting disc is driven to tilt upwards due to bending operation, so that the end part of the extending part of the current collecting disc is prevented from being broken at the welding edge of the flange part of the pole, the connection reliability of the end part of the extending part of the current collecting disc and the flange part of the pole is ensured, the bending process is faster and more labor-saving, and the yield and efficiency of mass production are further improved.

Drawings

In order to more clearly illustrate the technical solutions of the present application, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained by those skilled in the art without the inventive effort.

Fig. 1 is an application scenario diagram of an energy storage device provided in an embodiment of the present application;

fig. 2 is a partially exploded schematic view of an energy storage device according to an embodiment of the present disclosure;

FIG. 3 is an exploded view of a portion of the end cap assembly of the energy storage device of FIG. 2;

FIG. 4 is an exploded view of a portion of the end cap assembly of FIG. 3 at another angle;

FIG. 5 is a schematic view of the top cover of FIG. 3;

FIG. 6 is a schematic view of another angular configuration of the top cover of FIG. 5;

FIG. 7 is a schematic view of the insulating member shown in FIG. 3;

FIG. 8 is a schematic view of another angular configuration of the insulating member shown in FIG. 7;

FIG. 9 is a schematic view of a second embodiment of the insulating member shown in FIG. 2, showing another angle of the insulating member;

FIG. 10 is a schematic view of a third embodiment of the insulating member shown in FIG. 2, showing another angle of the insulating member;

FIG. 11 is a schematic cross-sectional view of the end cap assembly of FIG. 3;

fig. 12 is a schematic view of the structure of the collecting tray shown in fig. 2;

fig. 13 is a schematic view of another angular structure of the collecting tray shown in fig. 12;

fig. 14 is a schematic view of an end cap assembly of the energy storage device of fig. 2 with the current collecting tray in an expanded state;

fig. 15 is a schematic view of an end cap assembly of the energy storage device of fig. 14 with the current collecting tray in a folded condition;

fig. 16 is a schematic view showing an assembled structure of the current collecting plate of fig. 2 and the insulating member of the second embodiment shown in fig. 9;

fig. 17 is a schematic view showing an assembled structure of the current collecting plate of fig. 2 and the insulating member of the third embodiment shown in fig. 10;

fig. 18 is an exploded view of a portion of the energy storage device of fig. 2.

The corresponding nouns of the reference numerals in the figures are: 5000 household energy storage systems, 4000 electric energy conversion devices, 3000 user load 1, 2000 user load 2, 1000 energy storage devices, 100 end cap assemblies, 200 current collecting trays, 300 electrode assemblies, 310 cell bodies, 320 lugs, 400 housings, 20 caps, 21 cap bodies, 211 post holes, 212 liquid injection holes, 213 first mounting faces, 2131 mounting slots, 2132 liquid injection slots, 214 second mounting faces, 2141 projections, 215 through slots, 22 explosion-proof valves, 10 insulating members, 11 body portions, 111 first faces, 112 second faces, 113 peripheral sides, 114 post through holes, 115 through slots, 1151 slot bottom walls, 1152 vent holes, 116 liquid injection through slots, 1161 slot bottom walls, 1162 liquid injection through holes, 13 receiving slots, 131 first slot side walls, 132 second groove side wall, 133 third groove side wall, 134 groove bottom wall, 135 notch, 14 positioning body, 141 boss, 142 cylinder, 143 bump, 144 first bump, 145 second bump, 151 first clamping portion, 1511 first press-fit body, 1512 first holding body, 152 second clamping portion, 1521 second press-fit body, 1522 second holding body, 40 disc body portion, 41 body, 411 third surface, 412 fourth surface, 413 electrolyte hole, 414 groove, 42 welding protrusion, 50 connection portion, 60 extension portion, 61 fifth surface, 62 sixth surface, 63 positioning hole, 64 first notch, 65 second notch, 30 upper plastic, 30 through hole, 70 press block, 80 pole, 81 pole cylinder, 82 flange portion, 90 seal ring.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

Because of the strong timeliness and space properties of energy required by people, in order to reasonably utilize the energy and improve the utilization rate of the energy, one energy form needs to be stored by one medium or equipment and then converted into another energy form, and the energy is released in a specific energy form based on future application. As is well known, to achieve the great goal of carbon neutralization, the main approach to green electric energy generation is to develop green energy sources such as photovoltaic, wind power and the like to replace fossil energy sources. At present, the generation of green electric energy generally depends on photovoltaic, wind power, water potential and the like, but wind energy, solar energy and the like generally have the problems of strong intermittence and large fluctuation, which can cause unstable power grid, insufficient peak electricity consumption, too much electricity consumption and unstable voltage can cause damage to the electric power, so that the problem of 'wind abandoning and light abandoning' possibly occurs due to insufficient electricity consumption requirement or insufficient power grid acceptance, and the problem needs to be solved by relying on energy storage. The energy is converted into other forms of energy through physical or chemical means and is stored, the energy is converted into electric energy when needed and released, in short, the energy storage is similar to a large-scale 'charge pal', the electric energy is stored when the photovoltaic and wind energy are sufficient, and the stored electric power is released when needed.

Taking electrochemical energy storage as an example, the scheme provides an energy storage device, wherein a group of chemical batteries are arranged in the energy storage device, chemical elements in the chemical batteries are mainly used as energy storage media, and the charge and discharge process is accompanied with chemical reaction or change of the energy storage media.

The existing energy storage (i.e. energy storage) application scene is wider, including aspects such as power generation side energy storage, electric network side energy storage, renewable energy grid-connected energy storage, user side energy storage and the like, the types of corresponding energy storage devices include:

(1) The large energy storage container applied to the energy storage scene at the power grid side can be used as a high-quality active and reactive power regulation power supply in the power grid, so that the load matching of electric energy in time and space is realized, the renewable energy consumption capability is enhanced, and the large energy storage container has great significance in the aspects of standby of a power grid system, relieving peak load power supply pressure and peak regulation and frequency modulation;

(2) The main operation modes of the small and medium-sized energy storage electric cabinet applied to the industrial and commercial energy storage scenes (banks, shops and the like) at the user side and the household small-sized energy storage box applied to the household energy storage scene at the user side are peak clipping and valley filling. Because of the large price difference of the electricity charge at the peak-valley position according to the electricity consumption requirement, after the energy storage equipment is arranged by a user, in order to reduce the cost, the energy storage cabinet/box is charged usually in the electricity price valley period; and in the peak period of electricity price, the electricity in the energy storage equipment is released for use, so that the purpose of saving electricity charge is achieved. In addition, in remote areas and areas with high occurrence of natural disasters such as earthquake, hurricane and the like, the household energy storage device is equivalent to the fact that a user provides a standby power supply for the user and the power grid, and inconvenience caused by frequent power failure due to disasters or other reasons is avoided.

Fig. 1 is an application scenario diagram of an energy storage device provided in an embodiment of the present application, where a household energy storage scenario in user side energy storage is taken as an example for illustration, and the energy storage device of the present application is not limited to the household energy storage scenario.

The application provides a household energy storage system 5000, this household energy storage system 5000 includes electric energy conversion equipment (photovoltaic board) 4000, user load 1 (street lamp) 3000, user load 2 (household appliance) 2000 etc. and energy storage device 1000, and this energy storage device 1000 is a small-size energy storage case, and accessible hanging mode is installed in outdoor wall. In particular, the photovoltaic panel may convert solar energy into electric energy during low electricity price periods, and the energy storage device 1000 is used to store the electric energy and supply the electric energy to street lamps and household appliances for use during electricity price peaks, or to supply power during power outage/power outage of the power grid.

It is understood that the energy storage device 1000 may include, but is not limited to, a battery cell, a battery module, a battery pack, a battery system, etc. When the energy storage device 1000 is a single battery, it may be a cylindrical battery. The embodiment of the present application will be described by taking the energy storage device 1000 as a cylindrical battery as an example.

Referring to fig. 2, fig. 2 is a schematic exploded view of a portion of an energy storage device according to an embodiment of the disclosure.

The present application provides an energy storage device 1000, where the energy storage device 1000 is configured to supply power to a powered device (not shown). The energy storage device 1000 may be a battery or other component having a power storage function. In this embodiment, the energy storage device 1000 is a cylindrical battery. The electric equipment is illustrated by taking an automobile as an example, the automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile. The vehicle includes an energy storage device, a controller, and a motor. The energy storage device 1000 is used for supplying power to the controller and the motor as an operation power source and a driving power source of the automobile, for example, the energy storage device 1000 is used for the working power consumption requirements during the starting, the navigation and the running of the automobile; for another example, the energy storage device 1000 supplies power to a controller that controls the energy storage device 1000 to supply power to a motor that receives and uses the power of the energy storage device 1000 as a driving power source for the vehicle, instead of or in part instead of fuel oil or natural gas to provide driving power to the vehicle. It is understood that the energy storage device 1000 may also be a square battery or other component having a power storage function.

In this embodiment, the energy storage device 1000 includes a case 400, an electrode assembly 300, an end cap assembly 100, and a current collecting plate 200 connecting the electrode assembly 300 and the end cap assembly 100. The housing 400 includes an opening and a receiving chamber. The electrode assembly 300 is received in the receiving chamber, and the cap assembly 100 is sealed to the opening. The current collecting plate 200 is provided at one side of the end cap assembly 100 adjacent to the electrode assembly 300, and the current collecting plate 200 is used to connect the tabs of the electrode assembly 300 with the tabs of the end cap assembly 100.

The electrode assembly 300 includes a cell body 310 and tabs 320. The battery cell body 310 is formed by stacking or winding together a positive electrode sheet, a negative electrode sheet, and an insulating film between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet each include a first portion coated with an active material and a second portion extending outwardly from the first portion and not coated with an active material. The tab 320 includes a negative electrode tab and a positive electrode tab, the negative electrode tab corresponds to a second portion of the negative electrode tab that is not coated with an active material, and the positive electrode tab corresponds to a second portion of the positive electrode tab that is not coated with an active material. Along the height direction of the battery cell body 310, the negative electrode tab and the positive electrode tab are respectively located at opposite ends of the battery cell body 310.

It should be noted that, the end cap assembly 100 provided in the present application may be used to connect with the negative electrode tab of the electrode assembly 300 through the current collecting plate 200, or may be used to connect with the positive electrode tab of the electrode assembly 300 through the current collecting plate 200. The embodiments of the present application are not limited in this regard.

Referring to fig. 2, 3 and 4 in combination, fig. 3 is a partially exploded view of the end cap assembly of the energy storage device shown in fig. 2, and fig. 4 is a partially exploded view of the end cap assembly at another angle shown in fig. 3. The cap assembly 100 includes an insulation member 10 and a top cap 20, the top cap 20 and the insulation member 10 being stacked and fixedly coupled, and the insulation member 10 serves to insulate the top cap 20 from the electrode assembly 300. The top cover 20 in this embodiment is an aluminum light member, and the insulating member 10 is made of plastic material and is insulating.

Referring to fig. 5 and 6, fig. 5 is a schematic structural view of the top cover shown in fig. 3; fig. 6 is a schematic view of another angular structure of the top cover shown in fig. 5. 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 comprises a pole hole 211 and a liquid injection hole 212. The pole hole 211 is located at a middle position of the top cover body 21, and the explosion-proof valve 22 and the liquid injection hole 212 are respectively located at opposite sides of the pole hole 211.

Specifically, the top cover body 21 is a circular plate shape. 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 disposed opposite to each other. In the present embodiment, the first mounting surface 213 is provided with a mounting groove 2131. The mounting groove 2131 is concavely arranged in the middle of the first mounting surface 213; the post hole 211 penetrates the bottom wall of the mounting groove 2131 and the second mounting surface 214 of the cap body 21 in the thickness direction of the cap body 21. The pole hole 211 is used for passing a pole of the energy storage device 1000. In this embodiment, the mounting groove 2131 is a cross-shaped groove.

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

The cap body 21 is provided with a through groove 215 penetrating the first mounting surface 213 and the second mounting surface 214 at a side position, and the through groove 215 is positioned at a 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 with the groove wall of the through groove 215. When the pressure in the energy storage device 1000 is too high, the explosion-proof valve 22 will automatically open to release pressure, so as to prevent explosion. In this embodiment, the top cover 20 may further include a protective film (not shown) disposed at an end of the through groove 215 near the first mounting surface 213, where the protective film can prevent external foreign matters from entering the explosion-proof valve 22 or damaging the explosion-proof valve 22.

Referring to fig. 7 and 8, fig. 7 is a schematic structural view of the insulating member shown in fig. 3, and fig. 8 is another schematic angular structural view of the insulating member shown in fig. 7. In the present embodiment, the insulating member 10 includes a body portion 11. Specifically, the insulating member 10 has a cake shape. Along the thickness direction of the insulating member 10, the body portion 11 includes first and

second surfaces

111 and 112 disposed opposite to each other, and a peripheral side surface 113, the peripheral side surface 113 being disposed along the periphery of the body portion 11 and connecting the first and

second surfaces

111 and 112.

The body 11 is provided with a post through hole 114. The post through hole 114 is located at a middle position of the body portion 11. The post through hole 114 penetrates the first surface 111 and the second surface 112 of the body portion 11 in the thickness direction of the body portion 11. In this embodiment, the body 11 is a circular plate, and on the first surface 111, a vent groove 115 and a liquid injection groove 116 are respectively recessed in the opposite sides of the through hole 114 toward the second surface 112. The bottom wall 1151 of the ventilation groove 115 is provided with a ventilation hole 1152, and the ventilation hole 1152 penetrates the bottom wall 1151 of the ventilation groove 115 and the second surface 112 of the body 11. The tank bottom wall 1161 of the liquid injection through tank 116 is provided with a liquid injection through hole 1162, and the liquid injection through hole 1162 penetrates the tank bottom wall 1161 of the liquid injection through tank 116 and the second surface 112 of the body portion 11.

As shown in fig. 8, the insulating member 10 is further provided with a receiving groove 13, where the receiving groove 13 is concavely disposed on the second surface 112 and has a notch 135. Specifically, the notch 135 penetrates the peripheral side surface 113 of the body portion 11. It is also understood that the peripheral side surface 113 of the body 11 is provided with a notch 135, and the notch 135 communicates with the accommodating groove 13. The receiving groove 13 includes a first groove sidewall 131, a second groove sidewall 132, and a third groove sidewall 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 arranged on the groove bottom wall 134 in a protruding mode and extend in a direction away from the groove bottom wall 134; the first, second and third

slot side walls

131, 132, 133 are all disposed at an angle to the slot bottom wall 134. The second slot sidewall 132 is connected between the first slot sidewall 131 and the third slot sidewall 133 to form a U-shaped structure. The post through hole 114 penetrates the first surface 111 of the body portion 11 and the groove bottom wall 134 of the accommodating groove 13.

Specifically, the first slot sidewall 131 and the third slot sidewall 133 are located on opposite sides of the notch 135, respectively. The second slot sidewall 132 is located on a side of the post via 114 remote from the notch 135 and spaced opposite the notch 135, with the post via 114 being located between the notch 135 and the second slot sidewall 132. It will be appreciated that the notch 135 is a mouth opening in the receiving slot 13.

The insulating member 10 further includes a positioning body 14, where the positioning body 14 is protruding from a bottom wall 134 of the accommodating groove 13. In this embodiment, the positioning body 14 has a cylindrical shape. The positioning body 14 is also provided with a chamfer. The positioning body 14 comprises an end face far away from the accommodating groove 13 and a peripheral side face connected with the end face, a chamfer is formed at the joint of the end face of the positioning body 14 and the peripheral side face of the positioning body 14, and the chamfer is obliquely arranged from the end face of the positioning body 14 to the peripheral side face direction of the positioning body 14. It will be appreciated that the positioning body 14 is a conical pillar along the thickness of the insulating member 10. The end of the positioning body 14 is provided with a chamfer, so that the end face of the positioning body 14 can be prevented from scratching the extending part 60 of the current collecting disc 200 when the positioning body 14 is inserted into the positioning hole 63 of the extending part 60 of the current collecting disc 200, and the positioning body 14 of the insulating part 10 can be conveniently penetrated into the positioning hole 63 of the extending part 60.

The number of positioning bodies 14 is at least one. In the present embodiment, the number of the positioning bodies 14 is two. The height dimensions of the two positioning bodies 14 (the distance between the end surface of the positioning body 14 away from the groove bottom wall 134 of the accommodating groove 13 and the groove bottom wall 134 of the accommodating groove 13) are the same. The height dimension of the second surface 112 of the positioning body 14 protruding from the body portion 11 is 0.3mm-1.0mm, specifically, may be 0.3mm, may be 1.0mm, or may be any value between 0.3 and 1.0. Along the width direction of the accommodating groove 13, two positioning bodies 14 are respectively arranged on two opposite sides of the central axis of the accommodating groove 13 (the central axis refers to a bisector of the width of the accommodating groove 13, and the central axis extends along the length direction of the accommodating groove 13), and the vertical distance between the two positioning bodies 14 and the central axis of the accommodating groove 13 is equal. Along the length direction of the accommodating groove 13, 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 this embodiment, the positioning body 14 is an elastomer, and specifically, the positioning body 14 may be a plastic piece with elasticity. In other embodiments, the positioning body 14 may be in other shapes, such as a tapered cylinder, and the positioning body 14 may have an area of the free end surface smaller than an area of a cross section away from the free end. The positioning bodies 14 may be aligned along the length direction or the width direction of the accommodating groove 13.

Referring to fig. 9, fig. 9 is a schematic structural view of a second embodiment of the insulating member shown in fig. 2, wherein another angle of the insulating member is shown. This embodiment differs from the above embodiment in the structure of the positioning body 14.

In this embodiment, the positioning body 14 includes a boss 141 and a post 142. The boss 141 is a substantially quadrangular block, and the boss 141 is protruded from the bottom wall 134 of the accommodating groove 13. The column 142 is strip-shaped, and the column 142 is protruded on the surface of the boss 141 facing away from the bottom wall 134 of the accommodating groove 13, and extends in a direction away from the boss 141. The end of the post 142 remote from the boss 141 is a bent end. Specifically, in the embodiment, the bending end of the column 142 is an arc structure, and one end of the column 142 away from the boss 141 is bent and extended in a direction approaching to the boss 141. In other embodiments, the bent end of the column 142 may have an L-shaped structure, and the end of the column 142 away from the boss 141 may also be bent and extended in a direction parallel to the bottom wall 134 of the accommodating groove 13.

In this embodiment, the column 142 is an elastomer, and specifically, the column 142 may be a plastic member with elasticity. In other embodiments, boss 141 may also be an elastomer; the boss 141 may have a triangular or pentagonal block structure.

The number of positioning bodies 14 is at least one. In the present embodiment, the number of the positioning bodies 14 is two. The height dimensions of the two positioning bodies 14 (the distance between the end surface 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 second surface 112 of the positioning body 14 protruding from the body portion 11 is 0.3mm-1.0mm, specifically, may be 0.3mm, may be 1.0mm, or may be any value between 0.3 and 1.0. Along the width direction of the accommodating groove 13, two positioning bodies 14 are respectively arranged on two opposite sides of the central axis of the accommodating groove 13 (the central axis refers to a bisector of the width of the accommodating groove 13, and the central axis extends along the length direction of the accommodating groove 13), and the vertical distance between the two positioning bodies 14 and the central axis of the accommodating groove 13 is equal. Along the length direction of the accommodating groove 13, 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, the positioning bodies 14 may be aligned along the length direction or the width direction of the accommodating groove 13.

Referring to fig. 10, fig. 10 is a schematic structural view of a third embodiment of the insulating member shown in fig. 2, wherein another angle of the insulating member is shown. This embodiment differs from the above embodiment in the structure of the positioning body 14.

In this embodiment, the positioning body 14 includes a bump 143, a first rib 144 and a second rib 145. The protruding block 143 is a substantially quadrangular block, and the protruding block 143 protrudes from the bottom wall 134 of the accommodating groove 13. The first ribs 144 are protruded on the surface of the protrusion 143 facing away from the bottom wall 134 of the accommodating groove 13. The first ribs 144 extend away from the direction of the bump 143, the first ribs 144 are arc-shaped strips, and the extending track of the first ribs 144 is arc-shaped. The second ribs 145 are protruded on the surface of the protrusion 143 facing away from the groove bottom wall 134 of the accommodating groove 13, the second ribs 145 are located between the first ribs 144 and the protrusion 143, and the orthographic projection of the first ribs 144 on the insulating member 10 and the orthographic projection of the second ribs 145 on the insulating member 10 at least partially overlap along the thickness direction of the insulating member 10. In this embodiment, the second rib 145 abuts against the surface of the first rib 144 facing the bottom wall 134 of the accommodating groove 13. In other embodiments, along the height direction of the positioning body 14, an end of the second rib 145 away from the boss 141 may be spaced apart from the first rib 144, that is, the second rib 145 is not abutted against the first rib 144. It will be appreciated that the second ribs 145 are spaced from the first ribs 144 in the thickness direction of the insulating member 10, and the second ribs 145 abut against the first ribs 144 when the first ribs 144 deform in the direction of the projections 143.

In this embodiment, the first ribs 144 and the second ribs 145 are all elastic bodies, and specifically, the first ribs 144 and the second ribs 145 may be plastic members with elasticity. In other embodiments, the bump 143 may be an elastomer; the bump 143 may have a triangular, pentagonal or other block structure.

The number of positioning bodies 14 is at least one. In the present embodiment, the number of the positioning bodies 14 is two. The height dimension of the two positioning bodies 14 (the distance between the end surface of the first rib 144 of the positioning body 14 away from the groove bottom wall 134 of the accommodating groove 13 and the groove bottom wall 134 of the accommodating groove 13) is the same. The height dimension of the second surface 112 of the positioning body 14 protruding from the body portion 11 is 0.3mm-1.0mm, specifically, may be 0.3mm, may be 1.0mm, or may be any value between 0.3 and 1.0. Along the width direction of the accommodating groove 13, two positioning bodies 14 are respectively arranged on two opposite sides of the central axis of the accommodating groove 13 (the central axis refers to a bisector of the width of the accommodating groove 13, and the central axis extends along the length direction of the accommodating groove 13), and the vertical distance between the two positioning bodies 14 and the central axis of the accommodating groove 13 is equal. Along the length direction of the accommodating groove 13, 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, the positioning bodies 14 may be aligned along the length direction or the width direction of the accommodating groove 13.

With continued reference to fig. 8, the insulating member 10 further includes a first clamping portion 151 and a second clamping portion 152. The first clamping part 151 and the second clamping part 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 part 151 and the second clamping part 152 are close to the notch 135; it will be appreciated that the first and

second clamping portions

151 and 152 are located on opposite sides of the notch 135 of the accommodating groove 13, and the first and

second clamping portions

151 and 152 are opposite in a direction in which the first and third

groove side walls

131 and 133 are opposite. A gap is provided between the first and second engaging

portions

151 and 152 and the groove bottom wall 134 of the accommodating groove 13 in the thickness direction of the insulating member 10. In other embodiments, the first engaging portion 151 and the second engaging portion 152 may be disposed in a staggered manner in a direction in which the first groove sidewall 131 and the third groove sidewall 133 are opposite to each other.

The first clamping portion 151 includes a first crimp body 1511 and a first abutting body 1512. The first crimp body 1511 is provided protruding from the side surface of the first groove sidewall 131 facing the third groove sidewall 133. Along the thickness direction of the insulating member 10, the first abutting body 1512 and the first press-contact body 1511 are arranged at intervals, one end of the first abutting body 1512 is fixed to the side surface of the first groove side wall 131, the other end is connected to the free end of the first press-contact body 1511, and the first press-contact body 1511 is arranged obliquely to the groove bottom wall 134 direction of the accommodating groove 13. The first press-contact body 1511 includes a first inclined surface facing away from the groove bottom wall 134 of the accommodating groove 13, the first inclined surface being connected to the wall surface of the first groove side wall 131 of the accommodating groove 13 and inclined toward the groove bottom wall 134 of the accommodating groove 13. The first press contact body 1511 and the first abutting body 1512 are both elastic members; a gap is formed between the first press-connection body 1511 and the first abutting body 1512, that is, the whole first clamping portion 151 is in a hollow structure, so that the elastic force of the first clamping portion 151 can be improved. It can be understood that the first clamping portion 151 has a cavity, and the first clamping portion 151 has a hollow structure. The slant design and the hollow design of the first clamping portion 151 can make the first clamping portion 151 more labor-saving when being pressed downwards. The first abutting body 1512 can support the first press-connection body 1511, so that the first press-connection body 1511 is prevented from deforming after being used repeatedly, and repeated use of the first clamping portion 151 is prevented from being affected. In this embodiment, the first press contact 1511 and the first abutting body 1512 are integrally formed. In other embodiments, the first clamping portion 151 may also be a separate structural member, i.e., the first clamping portion 151 may be a triangular block.

The second clamping portion 152 includes a second crimp body 1521 and a second abutment body 1522. The second crimp body 1521 is provided protruding from the side surface of the third groove sidewall 133 facing the first groove sidewall 131. Along the thickness direction of the insulating member 10, the second abutting body 1522 and the second press-contact body 1521 are disposed at intervals, one end of the second abutting body 1522 is fixed to the side surface of the third groove sidewall 133, the other end is connected to the free end of the second press-contact body 1521, and the second press-contact body 1521 is disposed obliquely to the groove bottom wall 134 of the accommodating groove 13. The second press-contact body 1521 includes a second inclined surface facing away from the groove bottom wall 134 of the accommodating groove 13, the second inclined surface being connected to the wall surface of the third groove side wall 133 of the accommodating groove 13 and inclined toward the groove bottom wall 134 of the accommodating groove 13. The second press-connection body 1521 and the second abutting body 1522 are elastic members; a gap is formed between the second pressing body 1521 and the second abutting body 1522, so as to promote 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 has a hollow structure. The oblique design and the hollow design of the second clamping portion 152 can make the second clamping portion 152 more labor-saving when being pressed downwards. The second abutting body 1522 can support the second press-connection body 1521, so as to avoid the deformation of the second press-connection body 1521 after multiple uses and the influence on multiple repeated uses 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, i.e., the second clamping portion 152 may be a triangular block.

Referring to fig. 11, fig. 11 is a schematic cross-sectional view of the end cap assembly of fig. 3. 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 face and are bonded to each other. The post through-holes 114 of the insulating member 10 are coaxially disposed and communicate with the post holes 211 of the top cover 20 in the thickness direction of the end cover assembly 100. The ventilation groove 115 of the insulating member 10 is disposed opposite to and communicates with the ventilation groove 215 of the top cover 20 in the thickness direction of the cap assembly 100; the orthographic projection of the through slot 215 of the top cover 20 on the body portion 11 falls within the orthographic projection of the through slot 115 on the body portion 11. The liquid injection through groove 116 of the insulating part 10 is opposite to and communicated with the liquid injection hole 212 of the top cover 20 along the thickness direction of the end cover assembly 100; the orthographic projection of the liquid filling hole 212 of the top cover 20 on the main body 11 falls into the orthographic projection of the liquid filling through groove 116 on the main body 11.

It will be appreciated that the tabs or separator films are prone to breakage and debris during transportation of the energy storage device 1000. The bottom wall 1151 of the ventilation groove 115 can prevent fragments of the tab or the isolation film from floating below the explosion-proof valve 22, and prevent the passage of air from being blocked, thereby causing explosion-proof failure. The bottom wall 1161 of the liquid injection through groove 116 can prevent fragments of the tab or the isolation film from floating below the liquid injection hole 212, and prevent the liquid injection hole 212 from being blocked, thereby affecting the liquid injection process.

Referring to fig. 12 and 13, fig. 12 is a schematic structural view of the collecting tray shown in fig. 2, and fig. 13 is another schematic angular structural view of the collecting tray shown in fig. 12. The current collecting tray 200 includes a tray body 40, a connection portion 50, and an extension portion 60. The tray portion 40 is fixedly connected to the tab 320 of the electrode assembly 300, and the extension portion 60 is fixedly connected to the post of the end cap assembly 100. The connection portion 50 is connected between the tray body 40 and the extension portion 60. By bending the connection portion 50, the tray body 40 can be bent with respect to the extension portion 60. In this embodiment, the collecting tray 200 has a sheet-like structure as a whole.

The tray body 40 includes a body 41 and a welding boss 42. The body 41 has a disk shape. Along the thickness direction of the body 41, the body 41 includes a third surface 411 and a fourth surface 412 disposed opposite to each other. The welding projection 42 is provided on the body 41.

The welding protrusion 42 is protruding from the third surface 411 of the body 41, and the welding protrusion 42 is substantially elongated and shaped like a plate and extends along the radial direction of the body 41. In this embodiment, the number of the welding protrusions 42 is 4, and the welding protrusions are circumferentially distributed around the center of the body 41; adjacent two welding projections 42 are angularly spaced apart by 90 ° on the body 41. The welding protrusions 42 are used to weld with the tabs 320 of the electrode assembly 300, i.e., the tabs 320 of the electrode assembly 300 are connected with the current collecting plate 200 through the welding protrusions 42.

The body 41 is provided with electrolyte holes 413 and grooves 414. The electrolyte hole 413 is located at an intermediate position of the body 41, and the electrolyte hole 413 penetrates the third surface 411 and the fourth surface 412 of the body 41 in the thickness direction of the body 41. The electrolyte holes 413 are used to allow electrolyte to flow into the electrode assembly 300 during the injection process.

The groove 414 is concavely formed on the fourth surface 412 of the body 41. In the present embodiment, the groove 414 is substantially elongated and extends along the radial direction of the body 41; the number of the grooves 414 is 4, and the grooves are circumferentially distributed around the center of the body 41; adjacent two grooves 414 are angularly spaced 90 apart on the body 41. Along the thickness direction of the body 41, the positions of the 4 welding protrusions 42 are opposite to the positions of the 4 grooves 414 respectively, that is, in the thickness direction of the disc portion 40, the front projection of the welding protrusions 42 on the body 41 is at least partially overlapped with the front projection of the grooves 414 on the body 41.

It will be appreciated that by providing the grooves 414 on the body 41 and having the grooves 414 and the welding projections 42 opposite in the thickness direction of the body 41, on the one hand, the combination of the grooves 414 and the welding projections 42 has no great influence on the strength of the entire tray body 40, and on the other hand, the provision of the grooves 414 can reduce the production material for producing the tray body 40, which is advantageous in reducing the production cost and weight of the current collecting tray 200.

The connecting portion 50 is a substantially rectangular thin plate, and one end of the connecting portion 50 is connected to the circumferential surface of the body 41 and the other end is connected to an end of the extending portion 60. In this embodiment, the connection portion 50 is made of a flexible material. It is understood that the connection portion 50 is connected between the body 41 of the tray body 40 and the extension portion 60, and the extension portion 60 extends in the same direction as the connection portion 50.

The extending portion 60 is a substantially rectangular thin plate, the extending portion 60 is formed by extending the side portion of the connecting portion 50 away from the body 41, and the extending direction of the extending portion 60 in this embodiment is the same as the extending direction of one welding protrusion 42.

Along the thickness direction of the extension portion 60, the extension portion 60 includes a fifth surface 61 and a sixth surface 62 disposed opposite to each other. The extension portion 60 is provided with a positioning hole 63, and the positioning hole 63 penetrates through the fifth surface 61 and the sixth surface 62 of the extension portion 60 along the thickness direction of the extension portion 60. The number of the positioning holes 63 is at least one, and in this embodiment, the number of the positioning holes 63 is 2. Along the width direction of the extension portion 60, two positioning holes 63 are respectively disposed on opposite sides of a central axis of the extension portion 60 (the central axis refers to a bisector of the width of the extension portion 60, and the central axis extends along the length direction of the extension portion 60), and the vertical distance between the two positioning holes 63 and the central axis of the extension portion 60 is equal. Along the length direction of the extension part 60, two positioning holes 63 are arranged in a staggered manner; along the width direction of the extension portion 60, the two positioning holes 63 are offset. Along the width direction of the extension portion 60, on two opposite sides of the central axis of the extension portion 60, the two positioning holes 63 are equidistant from the nearest side edge of the extension portion 60, the distance between the positioning holes 63 and the nearest side edge of the extension portion 60 is d, and the d value ranges from 3.0mm to 5.0mm, specifically, the d value may be 3.0mm, may be 5.0mm, or may be any value between 3.0 and 5.0. The positioning hole 63 is circular in shape, the aperture of the positioning hole 63 is larger than the diameter of the positioning body 14 of the insulating member 10, and the difference between the aperture of the positioning hole 63 and the diameter of the positioning body 14 is 0.5mm-1.0mm, specifically, may be 0.5mm, may be 1.0mm, or may be any numerical value between 0.5 and 1.0. In other embodiments, the positioning holes 63 may have other shapes, such as rectangular, triangular, diamond, etc.

The extension 60 is further provided with a first notch 64 and a second notch 65. The first notch 64 and the second notch 65 are located on opposite sides of the end of the extension 60 connected to the connection portion 50 in the width direction of the extension 60. The first notch 64 and the second notch 65 penetrate through the fifth surface 61 and the sixth surface 62 of the extension 60 in the thickness direction of the extension 60.

Referring to fig. 14 and 15, fig. 14 is a schematic view illustrating an assembly process of an end cap assembly of the energy storage device shown in fig. 2, wherein the current collecting plate is in an expanded state; fig. 15 is a schematic view of an end cap assembly of the energy storage device of fig. 14 with the current collecting tray in a folded condition.

The extension 60 of the current collecting plate 200 is received in the receiving groove 13 of the insulating member 10. Along the thickness direction of the insulating member 10, the positioning body 14 in the accommodating groove 13 of the insulating member 10 is inserted into 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 member 10. Specifically, along the thickness direction of the insulating member 10, the first engaging portion 151 faces the first notch 64, and the second engaging portion 152 faces the second notch 65. In the thickness direction of the insulating member 10 and towards 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 are clamped by pressing the extending portion 60, specifically pressing the edge positions 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 and

second clamping portions

151 and 152 deform so that the extension portion 60 passes. It can be understood that, along the thickness direction of the insulating member 10, the first clamping portion 151 and the bottom wall 134 of the accommodating groove 13 limit (clamp) the extension portion 60 of the current collecting tray 200, and the extension portion 60 is limited in 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 current collecting tray 200, and the extension portion 60 is limited in a gap between the second clamping portion 152 and the bottom wall 134 of the accommodating groove 13. After the extension part 60 of the current collecting plate 200 is mounted in the accommodating groove 13, the first clamping part 151 and the second clamping part 152 can prevent the extension part 60 of the current collecting plate 200 from being separated from the accommodating groove 13; meanwhile, by arranging the first notch 64 and the second notch 65, the extension portion 60 of the current collecting disc 200 partially avoids the first clamping portion 151 and the second clamping portion 152, so that the extension portion 60 of the current collecting disc 200 can be clamped into the accommodating groove 13 more labor-saving.

When the extension part 60 of the current collecting disc 200 is assembled on the insulating part 10, the positioning body 14 in the accommodating groove 13 of the insulating part 10 can play a limiting role on the extension part 60 of the current collecting disc 200; in the process of bending the manifold plate 200, the positioning body 14 can prevent the manifold plate 200 from dislocating and shaking, and the positioning body 14 can limit the extent to which the extension portion 60 of the manifold plate 200 is lifted upwards due to the bending operation of the manifold plate 200 in the maximum range. In addition, since the aperture of the positioning hole 63 of the extension portion 60 of the current collecting plate 200 is larger than the diameter of the positioning body 14 of the insulating member 10, and the difference between the aperture of the positioning hole 63 and the diameter of the positioning body 14 is 0.5mm-1.0mm, a certain assembly gap is reserved in the positioning hole 63 of the extension portion 60, so that the positioning body 14 of the insulating member 10 is conveniently inserted into the positioning hole 63 of the extension portion 60. In addition, the chamfer is arranged at the end of the positioning body 14, so that the end face of the positioning body 14 can be prevented from scratching the extending part 60 of the current collecting disc 200 when the positioning body 14 is inserted into the positioning hole 63 of the extending part 60 of the current collecting disc 200, and the positioning body 14 of the insulating part 10 can be conveniently penetrated into the positioning hole 63 of the extending part 60.

Along the length direction of the accommodating groove 13, the positioning body 14 on the insulating part 10 is arranged in a staggered manner, and the positioning holes 63 of the extending part 60 of the current collecting disc 200 are correspondingly arranged in a staggered manner, so that on one hand, the situation that the stress around the positioning holes 63 caused by the tensile force when the extending part 60 of the current collecting disc 200 is lifted away from the accommodating groove 13 due to the bending operation of the current collecting disc 200 is excessively concentrated can be avoided, and further, the extending part 60 of the current collecting disc 200 is easily cracked and broken from the positioning holes 63 due to the stress concentration in the bending process, so that the service life of the energy storage device 1000 is influenced, and on the other hand, a certain foolproof effect is realized, and the third surface 411 provided with the welding protrusions 42 on the current collecting disc 200 faces the direction of the lugs 320 under the condition that the positions of the staggered positioning body 14 and the staggered positioning holes 63 are in one-to-one correspondence, so that the current collecting disc 200 is prevented from being reversely placed and incapable of being welded with the lodged lugs.

Through the connection portion 50 of the bending current collecting plate 200, the plate body portion 40 may be bent with respect to the extension portion 60, and the plate body portion 40 covers the second surface 112 of the body portion 11 along the thickness direction of the insulating member 10, and the extension portion 60 is located between the plate body portion 40 and the body portion 11. The height dimension of the body 11 is 0.3mm-1.0mm, and the positioning body 14 protrudes from the second surface 112 of the body 11, so that the tray 40 abuts against the positioning body 14 of the insulating member 10. Because disk body portion 40 butt in insulating part 10's locating body 14, and locating body 14 has elasticity, when energy memory 1000 receives outside striking or unexpected falling, locating body 14 can play the cushioning effect to disk body portion 40 to the vibrations of buffering disk body portion 40, avoid disk body portion 40's vibrations to lead to the connecting portion 50 of mass flow disk 200 to take place to break, and can improve disk body portion 40 and electrode assembly 300's tab 320's connection stability, and then promote energy memory 1000's overall structure stability. In the present embodiment, the orthographic projection of the disk portion 40 is located within the orthographic projection of the insulating member 10 in the thickness direction of the insulating member 10. The area of the tray body 40 is smaller than the area of the second surface 112, and the tray body 40 covers a large area of the second surface 112, not entirely covering the second surface 112.

By limiting the maximum height dimension of the positioning body 14 protruding out of the second surface 112 to 1.0mm, deformation of the tray body 40 after the tray body 14 is abutted against the positioning body 14 due to overhigh positioning body 14 can be avoided, and the service life of the energy storage device 1000 can be prolonged; by limiting the minimum height dimension of the positioning body 14 protruding from the second surface 112 to 0.3mm, it is ensured that the tray portion 40 can abut against the positioning body 14 under the combined action of the end cap assembly 100 and the electrode assembly 300 after the energy storage device 1000 is assembled; in addition, it is possible to prevent the current collecting plate 200 from being broken due to an excessive bending degree of the current collecting plate 200.

Along the width direction of the accommodating groove 13, the distance between the positioning body 14 and the central axis of the accommodating groove 13 is equal. When the tray body 40 of the current collecting tray 200 abuts against the positioning body 14, the forces acting on the opposite sides of the extending portion 60 of the current collecting tray 200 and the positioning body 14 are the same along the width direction of the extending portion 60, so that the forces acting on the opposite sides of the extending portion 60 are relatively uniform.

Referring to fig. 16, fig. 16 is a schematic diagram illustrating an assembly structure of the current collecting plate shown in fig. 2 and the insulating member of the second embodiment shown in fig. 9. The positioning holes 63 on the extension 60 of the current collecting plate 200 may also be quadrangular for fitting with the positioning bodies 14 of the insulating member 10 of the second embodiment. The extension portion 60 is accommodated in the accommodating groove 13 of the insulating member 10, and the positioning body 14 of the insulating member 10 is inserted into the positioning hole 63 of the extension portion 60.

Specifically, the extension portion 60 is sleeved on the boss 141 of the positioning body 14 through the positioning hole 63, the boss 141 is penetrated through the positioning hole 63, at this time, the extension portion 60 is located in the accommodating groove 13, and the extension portion 60 and the disc portion 40 are in an initial unfolded state. The tray body 40 drives the connecting portion 50 to bend relative to the extending portion 60, and the bending force of the connecting portion 50 and the extending portion 60 drives the extending portion 60 to tilt away from the accommodating groove 13. Because the positioning body 14 is a plastic part, the current collecting disc 200 is made of metal, and the edge of the positioning hole 63 of the extension part 60 can squeeze the boss 141 of the positioning body 14 in the process of tilting the extension part 60; since the diameter of the boss 141 of the positioning body 14 is larger than that of the column 142, friction force is generated on the periphery of the positioning hole 63, and the strength of the boss 141 of the positioning body 14 is larger than that of the column 142, the boss 141 can be prevented from being deformed by a large amount even broken by the edge of the positioning hole 63 under the extrusion of the edge of the positioning hole 63. At this time, the column 142 of the positioning body 14 is in a natural state. When the tray body 40 is folded and stacked on the side of the extension portion 60 facing away from the insulating member 10, the tray body 40 abuts against the end portion of the post 142 of the positioning body 14 away from the boss 141. When the tray 40 vibrates due to external impact or accidental falling of the energy storage device 1000, the free ends of the columns 142 of the positioning bodies 14 are elastically deformed, so as to buffer the vibration of the tray 40. The positioning body 14 of the present embodiment includes a bent column 142, that is, the free end of the column 142 is in a curved state, when the positioning body 14 receives the force applied by the disc portion 40 towards the boss 141, the deformable space of the column 142 of the positioning body 14 is larger, so that the magnitude of elastic deformation of the column 142 of the positioning body 14 is larger, and the positioning body 14 is more prone to absorb the impact and shock, thereby buffering the shock of the disc portion 40. Thus, the cushioning effect of the vibration of the disk portion 40 by the positioning body 14 is more remarkable.

Referring to fig. 17, fig. 17 is a schematic diagram illustrating an assembly structure of the current collecting plate shown in fig. 2 and the insulating member of the third embodiment shown in fig. 10. The positioning hole 63 on the extension 60 of the current collecting plate 200 may also be quadrangular for assembly with the positioning body 14 of the insulating member 10 of the third embodiment. The extension portion 60 is accommodated in the accommodating groove 13 of the insulating member 10, and the positioning body 14 of the insulating member 10 is inserted into the positioning hole 63 of the extension portion 60. Specifically, the extension portion 60 is sleeved on the bump 143 of the positioning body 14 through the positioning hole 63, and the bump 143 is penetrated through the positioning hole 63.

Specifically, the extension portion 60 is sleeved on the bump 143 of the positioning body 14 through the positioning hole 63, the bump 143 is penetrated through the positioning hole 63, at this time, the extension portion 60 is located in the accommodating groove 13, and the extension portion 60 and the disc portion 40 are in an initial unfolded state. The tray body 40 drives the connecting portion 50 to bend relative to the extending portion 60, and the bending force of the connecting portion 50 and the extending portion 60 drives the extending portion 60 to tilt away from the accommodating groove 13. Because the positioning body 14 is a plastic piece, the current collecting plate 200 is made of metal, and the edge of the positioning hole 63 of the extension portion 60 can press the bump 143 of the positioning body 14 in the process of tilting the extension portion 60. Because the diameter of the protruding block 143 of the positioning body 14 is larger than the diameters of the first protruding rib 144 and the second protruding rib 145, friction force can be generated on the periphery of the positioning hole 63, and the strength of the protruding block 143 of the positioning body 14 is larger than that of the first protruding rib 144 and the second protruding rib 145, the protruding block 143 can be prevented from being broken even by the edge of the positioning hole 63 due to larger deformation caused by extrusion of the edge of the positioning hole 63. At this time, the first ribs 144 and the second ribs 145 of the positioning body 14 are in a natural state. When the tray body 40 is folded and stacked on the side of the extension portion 60 facing away from the insulating member 10, the tray body 40 abuts against the end portion of the first rib 144 of the positioning body 14 away from the bump 143. The positioning body 14 of the present embodiment includes a first rib 144 and a second rib 145, the second rib 145 is located between the first rib 144 and the bump 143 along the thickness direction of the insulating member 10, and the orthographic projection of the first rib 144 on the insulating member 10 at least partially overlaps the orthographic projection of the second rib 145 on the insulating member 10. When the tray body 40 vibrates due to external impact or accidental falling of the energy storage device 1000, the positioning body 14 receives the acting force applied by the tray body 40 towards the direction of the protruding block 143, and the free end of the first protruding rib 144 elastically deforms to buffer the vibration of the tray body 40; meanwhile, the first rib 144 deforms towards the direction of the bump 143, the second rib 145 abuts against the first rib 144, and the second rib 145 can also elastically deform to buffer vibration of the first rib 144. Since both the first ribs 144 and the second ribs 145 can play a role of buffering, the positioning body 14 is more likely to absorb shock and vibration, thereby buffering the vibration of the tray body 40. Thus, the cushioning effect of the vibration of the disk portion 40 by the positioning body 14 is more remarkable.

Referring to fig. 18, fig. 18 is an exploded view of a portion of the energy storage device shown in fig. 2. The end cap assembly 100 also includes an upper plastic 30, a press block 70, a post 80, and a seal 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 facing away from the insulating member 10. The upper plastic 30 is provided with a through hole 31 for the pole 80 to pass through. The pressing block 70 is laminated on one side of the upper plastic 30 away from the top cover 20 and is fixedly connected with the upper plastic 30. Wherein the post 80 includes a post body 81 and a flange portion 82. The column 81 of the pole 80 sequentially penetrates through the pole through hole 114 of the insulating member 10, the pole hole 211 of the top cover 20, and the through hole 31 of the upper plastic 30 along the thickness direction of the end cover assembly 100, and is fixedly connected with the pressing block 70. The flange portion 82 of the post 80 is crimped with the second surface 112 of the insulating member 10. The end cap assembly 100 and the electrode assembly 300 are connected by the current collecting plate 200, and the current collecting plate 200 is positioned between the end cap assembly 100 and the electrode assembly 300. The extension portion 60 of the current collecting plate 200 is accommodated in the accommodating groove 13 of the insulating member 10, and the extension portion 60 of the current collecting plate 200 is fixedly connected with the flange portion 82 of the post 80. The disk body 40 of the current collecting disk 200 is fixedly connected with the tab 320 of the electrode assembly 300. The seal ring 90 is fitted to the end of the post body 81 of the post 80 near the flange 82. In this embodiment, the extension portion 60 of the current collecting plate 200 is connected to the flange portion 82 of the post 80 by welding, and the plate body portion 40 of the current collecting plate 200 is connected to the tab 320 of the electrode assembly 300 by welding.

The assembly process of the energy storage device 1000 provided in the embodiment of the present application is: first, the end cap assembly 100, the electrode assembly 300, the current collecting plate 200, and the case 400 are manufactured, respectively; secondly, the extension part 60 of the current collecting disc 200 is clamped in the accommodating groove 13 through the first clamping part 151 and the second clamping part 152 of the insulating component 10, and the end part of the extension part 60 of the current collecting disc 200 is welded and fixed with the flange part 82 of the pole 80; thirdly, welding and fixing the disk body 40 of the current collecting disk 200 with the tab 320 of the electrode assembly 300; afterwards, the connection portion 50 of the current collecting plate 200 is bent, so that the plate body portion 40 of the current collecting plate 200 is stacked on the side of the extension portion 60 of the current collecting plate 200 facing away from the insulating member 10, the plate body portion 40 of the current collecting plate 200 is abutted against the end portion of the positioning body 14, and the end cap assembly 100 is substantially coaxial with the electrode assembly 300; finally, the electrode assembly 300 is placed in the case 400 such that the cap assembly 100 is covered and sealed at the opening of the case 400, and the tray body 40 of the current collecting tray 200 is connected to the electrode assembly 300 through the opening.

It can be appreciated that after the extension portion 60 of the current collecting disc 200 is connected to the pole post 80 of the end cap assembly 100 and the disc portion 40 of the current collecting disc 200 is connected to the pole lug 320 of the electrode assembly 300, the bending process of the current collecting disc 200 may partially overlap the extension portion 60 and the disc portion 40 along the height direction of the energy storage device 1000, so that the occupied space of the current collecting disc 200 inside the energy storage device 1000 may be reduced, and the space utilization of the energy storage device 1000 may be improved, as compared with the case where the extension portion 60 and the disc portion 40 are on the same plane, thereby further improving the energy density of the energy storage device 1000. Because the end butt of disk body portion 40 and locating body 14 after buckling, and locating body 14 is the elastomer, when energy memory 1000 bumps or falls, locating body 14 can play the cushioning effect to the vibrations of disk body portion 40, avoids the vibrations of disk body portion 40 to lead to the connecting portion 50 of mass flow disk 200 to take place to fracture to can improve the connection stability of disk body portion 40 and electrode assembly 300's utmost point ear 320, and then promote energy memory 1000's overall structure stability. The positioning body 14 of the insulating part 10 can limit the extension part 60 of the current collecting disc 200 through the mutual matching of the positioning body 14 of the insulating part 10 and the positioning hole 63 of the extension part 60 of the current collecting disc 200; meanwhile, in the bending process of the current collecting plate 200, the positioning body 14 of the insulating part 10 can limit the degree that the extending part 60 of the current collecting plate 200 is driven to tilt upwards due to bending operation, so that the end part of the extending part 60 of the current collecting plate 200 is prevented from being broken at the welding edge of the flange part 82 of the pole 80, the connection reliability of the end part of the extending part 60 of the current collecting plate 200 and the flange part 82 of the pole 80 is ensured, the bending process is faster and more labor-saving, and the yield and efficiency of mass production are further improved.

The foregoing has outlined rather broadly the more detailed description of embodiments of the present application, wherein specific examples are provided herein to illustrate the principles and embodiments of the present application, the above examples being provided solely to assist in the understanding of the methods of the present application and the core ideas thereof; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.

Claims

1. An end cap assembly for an energy storage device (1000), the energy storage device (1000) comprising a current collecting plate (200) and an electrode assembly (300), the current collecting plate (200) comprising an extension portion (60) and a plate portion (40), the extension portion (60) being connected to one side of the plate portion (40) and extending away from the plate portion (40), characterized in that,

the extending part (60) is provided with a positioning hole (63), and the positioning hole (63) penetrates through the extending part (60) in the thickness direction of the extending part (60);

the end cap assembly (100) comprises an insulating member (10), the insulating member (10) comprising a body portion (11), the body portion (11) having a first surface (111) and a second surface (112), the first surface (111) and the second surface (112) being disposed opposite each other,

The insulating part (10) further comprises a containing groove (13), the containing groove (13) is concavely arranged on the second surface (112),

the insulating part (10) further comprises at least one positioning body (14), the at least one positioning body (14) is convexly arranged on the groove bottom wall (134) of the accommodating groove (13), and the at least one positioning body (14) is convexly arranged on the second surface (112) along the thickness direction of the body part (11) and has elasticity;

the extension part (60) is accommodated in the accommodating groove (13), and each positioning body (14) is penetrated into one positioning hole (63); the plate body (40) is bent relative to the extension (60) so that the plate body (40) covers the second surface in the thickness direction of the insulating member (10), and the plate body (40) is in contact with the positioning body (14);

the end cap assembly (100) is connected with the electrode assembly (300), the current collecting disc (200) is positioned between the end cap assembly (100) and the electrode assembly (300), and the disc body (40) is connected with the electrode assembly (300).

2. End cover assembly according to claim 1, characterized in that the number of the positioning bodies (14) is two, the heights of the two positioning bodies (14) are the same, the accommodating groove (13) is provided with a central axis extending along the length direction of the accommodating groove (13), the two positioning bodies (14) are respectively arranged on two opposite sides of the central axis of the accommodating groove (13), and the vertical distances between the two positioning bodies (14) and the central axis of the accommodating groove (13) are equal.

3. End cap assembly according to claim 2, wherein two of said positioning bodies (14) are offset along the length of said receiving groove (13).

4. The end cap assembly of claim 1, wherein the height of the locating body (14) protruding from the second surface (112) is 0.3mm-1.0mm.

5. End cap assembly according to any one of claims 1-4, wherein the positioning body (14) comprises an end surface remote from the receiving groove (13) and a peripheral side surface connected with the end surface, a chamfer is formed at the connection of the end surface of the positioning body (14) and the peripheral side surface of the positioning body (14), and the chamfer is obliquely arranged from the end surface of the positioning body (14) towards the peripheral side surface direction of the positioning body (14).

6. The end cap assembly according to any one of claims 1-4, wherein the positioning body (14) comprises a boss (141) and a column (142), the boss (141) is convexly arranged on a bottom wall (134) of the accommodating groove (13), and the column (142) is convexly arranged on a surface of the boss (141) facing away from the bottom wall (134) of the accommodating groove (13) and extends in a direction away from the boss (141); the end part of the column body (142) far away from the boss (141) is a bending end, and the column body (142) is an elastomer;

The tray body (40) is abutted with the end part of the column body (142) opposite to the boss (141), and the boss (141) is penetrated through the positioning hole (63).

7. The end cap assembly according to any one of claims 1-4, wherein the positioning body (14) comprises a projection (143), a first rib (144) and a second rib (145), the projection (143) being provided protruding from a bottom wall (134) of the receiving groove (13); the first ribs (144) are arranged on the surface of the protruding block (143) opposite to the groove bottom wall (134) of the accommodating groove (13) in a protruding mode, the second ribs (145) are arranged on the surface of the protruding block (143) opposite to the groove bottom wall (134) of the accommodating groove (13) in a protruding mode, and the orthographic projection of the second ribs (145) and the orthographic projection of the first ribs (144) are at least partially overlapped along the thickness direction of the insulating part (10), and the first ribs (144) and the second ribs (145) are elastic bodies;

the tray body (40) is abutted with the end part of the first convex rib (144) opposite to the convex block (143), and the convex block (143) penetrates through the positioning hole (63).

8. The end cap assembly of claim 7, wherein an end of the second bead (145) facing away from the tab (143) abuts the first bead (144).

9. The end cap assembly according to claim 7, wherein the insulating member (10) further comprises a first clamping portion (151) and a second clamping portion (152), the first clamping portion (151) and the second clamping portion (152) are respectively disposed on two opposite groove side walls of the accommodating groove (13), a gap is formed between the first clamping portion (151) and the second clamping portion (152) and the groove bottom wall (134) of the accommodating groove (13), and the extending portion (60) is limited in the gap between the first clamping portion (151) and the groove bottom wall (134) of the accommodating groove (13) and the gap between the second clamping portion (152) and the groove bottom wall (134) of the accommodating groove (13) along the thickness direction of the end cap assembly (100).

10. The end cap assembly according to claim 9, wherein the body portion (11) comprises a peripheral side surface (113) connecting between the first surface (111) and the second surface (112), the peripheral side surface (113) having a notch (135), the notch (135) being in communication with the receiving groove (13) along the length of the receiving groove (13); the first clamping part (151) and the second clamping part (152) are positioned on two opposite sides of the notch (135).

11. An energy storage device, characterized by comprising a housing (400), an electrode assembly (300), a current collecting disc (200) and an end cap assembly (100) according to any of claims 1-10, the housing (400) having an opening, the housing (400) being provided with a receiving cavity, the electrode assembly (300) being received in the receiving cavity, the end cap assembly (100) covering the opening, the disc portion (40) being connected to the electrode assembly (300).

12. The energy storage device of claim 11, wherein the current collecting plate (200) further comprises a connection portion (50), the connection portion (50) connects the plate portion (40) and the extension portion (60), the connection portion (50) is made of a flexible material, and the plate portion (40) is bendable relative to the extension portion (60) by bending the connection portion (50).

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

14. The energy storage device according to claim 11, wherein the number of the positioning holes (63) is two, the extension portion (60) has a central axis, the two positioning holes (63) are respectively disposed on two opposite sides of the central axis of the extension portion (60), and the vertical distances between the two positioning holes (63) and the central axis of the extension portion (60) are equal.

15. Energy storage device according to claim 11, characterized in that the vertical distance between the positioning hole (63) and the nearest side of the extension (60) in the width direction of the extension (60) is 3.0-5.0 mm.

16. A powered device comprising an energy storage device (1000) according to any of claims 11-15, the energy storage device (1000) being for powering the powered device.

17. A household energy storage system, comprising an energy storage device (1000) according to any of claims 11-15, an electrical energy conversion device (4000) and a consumer load, the energy storage device (1000) storing electrical energy of the electrical energy conversion device (4000) and delivering electrical energy to the consumer load.