CN116742229A

CN116742229A - Energy storage device and electric equipment

Info

Publication number: CN116742229A
Application number: CN202311032499.XA
Authority: CN
Inventors: 李茂松; 檀基本
Original assignee: Shenzhen Haichen Energy Storage Control Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Current assignee: Shenzhen Haichen Energy Storage Technology Co ltd; Xiamen Hithium Energy Storage Technology Co Ltd
Priority date: 2023-08-16
Filing date: 2023-08-16
Publication date: 2023-09-12
Anticipated expiration: 2043-08-16
Also published as: CN116742229B

Abstract

The application discloses an energy storage device and electric equipment. The energy storage device comprises lower plastic, and the lower plastic comprises a lower plastic body and an explosion-proof fence. The explosion-proof fence comprises a first side wall, a second side wall and a bottom wall, a plurality of through holes are arranged on the bottom wall at intervals, the first side wall and the second side wall are oppositely arranged along the length direction of the lower plastic, and the first side wall and the second side wall are connected with the lower plastic body. The explosion-proof fence further comprises a plurality of diversion holes, the plurality of diversion holes comprise first diversion holes and second diversion holes, the first diversion holes are formed in the first side wall and penetrate through the first side wall along the width direction of the first side wall; the second diversion holes are arranged on the second side wall and penetrate through the second side wall along the width direction of the second side wall. The energy storage device can avoid the blockage of the gas collecting space below the explosion-proof valve, is favorable for the diffusion of the gas generated by the battery cell, ensures the opening of the explosion-proof valve, and has better safety and reliability of the battery.

Description

Energy storage device and electric equipment

Technical Field

The application relates to the technical field of energy storage, in particular to an energy storage device and electric equipment.

Background

The cell can produce gas in the circulation process, the produced gas can move upwards, and the structure of the lower plastic explosion-proof valve has an important influence on the overflow of the gas produced by the cell. When the lower plastic explosion-proof net is blocked, the upward movement of the generated gas of the battery core is not smooth, and the diffusion of the generated gas of the battery core is not facilitated, so that the valve opening time of the explosion-proof valve is influenced, and the safety of a battery is further influenced.

Disclosure of Invention

The application provides an energy storage device and electric equipment, which can prevent an explosion-proof valve from being blocked, is beneficial to the diffusion of gas generated by a battery core, ensures the opening of the explosion-proof valve, and has better safety and reliability of a battery.

The energy storage device provided in this embodiment includes: the end cover assembly comprises lower plastic, the lower plastic comprises a lower plastic body, the lower plastic body comprises a first surface and a second surface along the thickness direction of the lower plastic, and the first surface and the second surface are arranged in a back-to-back manner; the lower plastic also comprises an explosion-proof fence, wherein the explosion-proof fence protrudes out of the second surface, and a concave part is formed on the first surface; the explosion-proof fence comprises a first side wall, a second side wall and a bottom wall, wherein the bottom wall is connected with the first side wall and the second side wall, a plurality of through holes which are distributed at intervals are formed in the bottom wall, the first side wall and the second side wall are oppositely arranged along the length direction of the lower plastic, and the first side wall and the second side wall are connected with the lower plastic body; the explosion-proof fence further comprises a plurality of diversion holes, the plurality of diversion holes comprise first diversion holes and second diversion holes, the first diversion holes are formed in the first side wall and penetrate through the first side wall along the width direction of the first side wall; the second diversion holes are arranged on the second side wall and penetrate through the second side wall along the width direction of the second side wall, and the first diversion holes and the second diversion holes are communicated with the concave part.

In one embodiment, along the thickness direction of the lower plastic, the first side wall forms a first included angle θ1 with a reference line of the thickness direction of the lower plastic, the second side wall forms a second included angle θ2 with a reference line of the thickness direction of the lower plastic, and the angle ranges of the first included angle θ1 and the second included angle θ2 are respectively 2-15 degrees.

In one embodiment, the bottom wall includes an inner surface and an outer surface, the inner surface and the outer surface are disposed opposite to each other along a thickness direction of the lower plastic, the inner surface is opposite to the second surface, and a junction between the outer surface of the bottom wall and the outer surface of the first side wall is an arc surface.

In one embodiment, the explosion-proof fence further comprises a first reinforcing rib extending along the width direction of the lower plastic, wherein the first reinforcing rib is convexly arranged on the inner surface of the bottom wall and is positioned in the concave part along the thickness direction of the lower plastic; the first reinforcing rib is provided with a first end face, and the first end face is lower than the first surface along the direction from the first surface to the second surface.

In one embodiment, the height difference H5 between the first end surface and the first surface is 0.45-2.25mm along the thickness direction of the lower plastic.

In one embodiment, an energy storage device includes an adapter and an electrode assembly, the electrode assembly including two tabs, the adapter including a first weld and a second weld; the end cover assembly comprises a top cover, a pole column and a flange arranged on the pole column, the top cover is laminated and connected with the lower plastic, the pole column penetrates through the lower plastic and the top cover, the flange is positioned on the second surface, and the adapter is connected with the flange; one tab is connected with the surface of the first welding part, which is away from the downward plastic, and the other tab is connected with the surface of the second welding part, which is away from the downward plastic.

In one embodiment, the lower plastic comprises a groove concavely arranged on the second surface, the pole penetrates through the lower plastic, the flange is accommodated in the groove, and the flange protrudes out of the second surface; the height H3 of the flange protruding out of the second surface along the thickness direction of the lower plastic is 1.56mm.

In one embodiment, a gap S3 is formed between the surface of the first welding part and the second welding part facing the lower plastic and the second surface along the thickness direction of the end cover assembly, and the gap S3 is 0.8-0.85mm.

In one embodiment, the first hole wall is formed on the first side wall by the first hole diversion hole, the second hole wall is formed on the second side wall by the second hole diversion hole, the first hole wall and the second hole wall are opposite to the second surface, the distance between the first hole wall and the second surface along the thickness direction of the lower plastic is L1, and the L1 and the gap S3 satisfy the relation: l1 < S3.

In one embodiment, the adapter comprises a body, a first weld, and a second weld; the first welding part and the second welding part are connected to two opposite sides of the body, the body comprises a body surface, the surface of the first welding part, which is welded with the tab, is a first welding surface, and the surface of the second welding part, which is welded with the tab, is a second welding surface; the first welding part and the second welding part are bent towards the direction opposite to the surface of the body relative to the body, and the surface of the body protrudes out of the first welding surface and the second welding surface along the direction from the top cover to the lower plastic.

In one embodiment, the difference in height between the body surface and the first and second weld faces is 0.85mm in the thickness direction of the end cap assembly.

In one embodiment, the tab protrudes from the surface of the first and second welds by a height of 0.65mm.

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

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 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 according to an embodiment of the present application;

FIG. 2 is a schematic perspective view of the energy storage device shown in FIG. 1;

FIG. 3 is an exploded view of the energy storage device of FIG. 2;

FIG. 4 is an exploded view of a portion of the energy storage device shown in FIG. 2;

FIG. 5 is an exploded view of a portion of the energy storage device of FIG. 2 at another angle;

FIG. 6 is a schematic structural view of a top cover body of the energy storage device shown in FIG. 4;

FIG. 7 is a cross-sectional view of the energy storage device shown in FIG. 2 taken along line A-A;

FIG. 8 is a schematic view of another angle of the first and second adapters of the energy storage device shown in FIG. 4;

FIG. 9 is a schematic diagram of a lower plastic of the energy storage device shown in FIG. 4;

FIG. 10 is a schematic view of another angle of the lower plastic of the energy storage device shown in FIG. 9;

FIG. 11 is a schematic view of a portion of the energy storage device shown in FIG. 2 at another angle;

fig. 12 is a cross-sectional view of the end cap assembly of the energy storage device shown in fig. 11 taken along line B-B.

The corresponding nouns of the reference numerals in the figures are: 5000 energy storage system, 4500 electric energy conversion device, 4000 wind energy conversion device, 3000 first user load, 1000 energy storage device, 400 housing, 100 end cap assembly, 200 electrode assembly, 310 first joint, 311 first body, 3111 first face, 312 first joint, 3120 first connection section, 3121 second face, 3122 first upper face, 313 second joint, 3130 second connection section, 3131 third face, 3132 second upper face, 320 second joint, 321 second body, 3211 fourth face, 322 third joint, 3220 third connection section, 3221 fifth face, 3222 third upper face, 323 fourth joint, 3230 fourth connection section, 3231 third face, 3232 fourth upper face, 210 pole core, 220 first pole ear, 230 second pole ear, 50 first pole, 51 first flange, 511 first abutment face, 52 first annular groove, 60 second pole, 61 second flange, 62 second annular groove, 611 second abutment face, 40 top cap, 41 top cap body, 411 front face, 412 back face, 413 first mounting groove, 414 second mounting groove, 42 first through hole, 43 second through hole, 44 explosion-proof valve, 441 explosion-proof valve protection sheet, 45 sealing plug, 46 through groove, 471 first notch, 4711 first wall, 4712 second wall, 472 second notch, 4721 third wall, 4722 fourth wall, 48 injection hole, 70 upper plastic component, 71 first upper plastic, 711 first collar, 72 second upper plastic, 721 second collar, 81 first seal, 82 second seal, 10 lower plastic, 11 lower plastic body, 111 first surface, 112 second surface, 12 first post through hole, 13 first groove, 131 first clamping protrusion, 14 second post through hole, 15 second groove, 151 second clamping protrusion, 16 explosion-proof fence, 16A recess, 161 first side wall, 162 second side wall, 163 bottom wall, 1631 outer surface, 1632 inner surface, 17 guide hole, 17a first deflector aperture, 171 first aperture wall, 17b second deflector aperture, 172 second aperture wall, 18 through-holes, 191 first stiffener, 1911 first end face, 192 second stiffener, 1921 second end face.

Detailed Description

The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the 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 (wind and light) power generation side energy storage, electric network side energy storage, base station side energy storage and user side energy storage, 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 small and medium energy storage electric cabinet is applied to industrial and commercial energy storage scenes (banks, markets and the like) at the user side, and the main operation mode is 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.

Referring to fig. 1, fig. 1 is an application scenario diagram of an energy storage device according to 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 is not limited to the household energy storage scenario.

The application provides a household energy storage system 5000, wherein the household energy storage system 5000 comprises an electric energy conversion device 4500 (photovoltaic panel), a wind energy conversion device 4000 (windmill), a first user load 3000 (base station), a second user load (not shown) (industrial and commercial side) and the like, and an energy storage device 1000, and the household energy storage system further comprises an energy storage cabinet, wherein the energy storage device 1000 is arranged in the energy storage cabinet and is convenient to install outdoors. In particular, the power conversion device 4500 may convert solar energy into electric energy during low electricity price period, and the energy storage device 1000 is used to store the electric energy and supply the electric energy to a base station and a commercial side for use during peak electricity price period, or supply the electric power during power outage/power failure of the electric network. Wind energy conversion device 4000 (windmill) can convert wind energy into electric energy, and energy storage device 1000 is used for storing the electric energy and supplying the electric energy to a base station and a business side for use at the time of peak electricity price or supplying power at the time of power failure/power outage of a power grid. The transmission of the electric energy can be performed by adopting a high-voltage cable.

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. The practical application form of the energy storage device 1000 provided in the embodiment of the present application may be, but not limited to, the listed products, and may be other application forms, and the embodiment of the present application does not strictly limit the application form of the energy storage device 1000. The number of the energy storage devices 1000 may be plural, and the energy storage devices 1000 may be connected in series or parallel to each other, and the energy storage devices 1000 are supported and electrically connected by using a separator (not shown). In the present embodiment, "a plurality of" means two or more.

The embodiment of the present application will be described by taking the energy storage device 1000 as a multi-core battery as an example.

Referring to fig. 2 and 3, the energy storage device 1000 includes a case 400, an end cap assembly 100, an electrode assembly 200, a first adapter 310 (not shown) and a second adapter 320 (not shown), wherein the end cap assembly 100 is mounted at one end of the electrode assembly 200, and the case 400 has an opening and is provided with a receiving cavity; the electrode assembly 200 is received in the receiving chamber, and the cap assembly 100 is sealed to the opening. Wherein the first adapter 310 connects the electrode assembly 200 with the first post 50 (not shown) of the end cap assembly 100 and the second adapter 320 connects the electrode assembly 200 with the second post 60 (not shown) of the end cap assembly 100.

For convenience of description, the length direction of the end cap assembly 100 shown in fig. 2 is defined as an X-axis direction, the width direction of the end cap assembly 100 is defined as a Y-axis direction, the thickness direction of the end cap assembly 100 is defined as a Z-axis direction, and the X-axis direction, the Y-axis direction and the Z-axis direction are perpendicular to each other. The terms "upper" and "lower" and the like in the description of the embodiments of the present application are described according to the directions shown in fig. 2 of the specification, and are not limited to the energy storage device 1000 in the practical application scenario, where the terms are "upper" toward the positive direction of the Z axis and "lower" toward the negative direction of the Z axis. The use of "identical", "equal" or "parallel" in the following allows for certain tolerances.

In this embodiment, the electrode assembly 200 includes two electrode cores 210. Along the width direction (Y-axis direction) of the energy storage device 1000, two pole pieces 210 are arranged side by side. Each pole piece 210 includes two pole lugs. Specifically, each of the pole cores 210 includes a first pole tab 220 and a second pole tab 230. Along the width direction (X-axis direction) of the energy storage device 1000, the first tabs 220 of the two pole cores 210 are disposed respectively, and the second tabs 230 of the two pole cores 210 are disposed respectively. The first tab 220 of the two pole cores 210 is connected to the first pole 50 through the first adapter 310, and the second tab 230 of the two pole cores 210 is connected to the second pole 60 through the second adapter 320.

In this embodiment, the outside of the electrode assembly 200 is further covered with an insulating film (not shown) for protecting the electrode core 210 from being scratched. The insulating film is coated on the outer surface of the electrode assembly 200, and the side edges of the insulating film are thermally fusion-bonded with the cap assembly 100.

Referring to fig. 4 and 5 together, the cap assembly 100 includes a lower plastic 10 and a top cover 40, the lower plastic 10 is mounted on the top cover 40, and the lower plastic 10 is located between the electrode assembly 200 and the top cover 40. The top cover 40 in this embodiment is an aluminum light member, and the lower plastic 10 is made of plastic material and is insulated. The end cap assembly 100 also includes two pole posts and an upper plastic assembly 70. Specifically, the two poles are a first pole 50 and a second pole 60, respectively. The upper plastic component 70 is fixedly connected with the top cover 40 and is sleeved on the first pole 50 and the second pole 60, and the first pole 50 and the second pole 60 are insulated from the top cover 40 through the upper plastic component 70. The first pole 50 is provided with a first flange 51, and the second pole 60 is provided with a second flange 61. The first flange 51 is for electrical connection with the first adapter 310 and the second flange 61 is for electrical connection with the second adapter 320. In this embodiment, the first tab 220 is a positive tab, the second tab 230 is a negative tab, the first post 50 is a positive post, the second post 60 is a negative post, the first flange 51 is a positive flange, and the second flange 61 is a negative flange.

In this embodiment, a flange is connected to one end of each pole, which is a first flange 51 and a second flange 61. Each flange has an abutment surface, a first abutment surface 511 and a second abutment surface 611, respectively.

One end of the first pole 50 is connected to a first flange 51. The outer periphery of the first pole 50 is provided with a first ring groove 52 for the upper plastic component 70 to be connected in a matching way. The first flange 51 has a first abutment surface 511, and the first abutment surface 511 faces the first pole 50. In the present embodiment, the first pole 50 is cylindrical, and the first flange 51 is square. The first pole 50 is connected to the first supporting surface 511 of the first flange 51 and is located in the middle of the first flange 51, and the minimum distance between the periphery of the first pole 50 and the edge of the first flange 51 is the narrowest width W1 of the first flange 51.

One end of the second post 60 is connected to a second flange 61. The outer periphery of the second post 60 is provided with a second ring groove 62 for the mating connection of the upper plastic component 70. The second flange 61 has a second abutment surface 611, and the second abutment surface 611 faces the second post 60. In the present embodiment, the second post 60 is cylindrical, and the second flange 61 is square. The second post 60 is connected to the second abutting surface 611 of the second flange 61 and is located in the middle of the second flange 61, and the minimum distance between the periphery of the second post 60 and the edge of the second flange 61 is the narrowest width W2 of the second flange 61.

In this embodiment, the cap 40 includes a cap body 41, an explosion-proof valve 44, and a sealing plug 45. The cap body 41 further includes a filling hole 48 and two through holes. Specifically, the two through holes are a first through hole 42 and a second through hole 43, respectively. It is understood that the first through hole 42 and the second through hole 43 are both cap through holes. The first through hole 42, the filling hole 48, the explosion-proof valve 44 and the second through hole 43 are sequentially arranged at intervals along the X-axis direction, that is, the length direction of the top cover 40.

Specifically, the top cover body 41 is a strip-shaped thin plate, and includes a front surface 411 and a back surface 412 disposed opposite to the front surface 411 along the thickness direction (Z-axis direction) of the top cover body 41. The top cover body 41 further includes first and second mounting grooves 413 and 414, the first and second mounting grooves 413 and 414 being located at opposite end positions (aligned along the X-axis direction) of the back surface 412 of the top cover body 41. The first mounting groove 413 and the second mounting groove 414 are rectangular grooves, and the first mounting groove 413 is formed by recessing the back surface 412 toward the front surface 411. The second mounting groove 414 is formed by recessing the back surface 412 toward the front surface 411. It will be appreciated that the first mounting groove 413 and the second mounting groove 414 are respectively disposed at opposite ends of the top cover body 41 for mating connection with the lower plastic 10. The first through hole 42 penetrates through the bottom wall of the first mounting groove 413, and the second through hole 43 penetrates through the bottom wall of the second mounting groove 414. It will be appreciated that the first through hole 42 and the second through hole 43 are respectively provided at opposite ends of the top cover body 41 for passing the first post 50 and the second post 60 of the battery, respectively.

In this embodiment, the top cover body 41 is further provided with a through slot 46 penetrating the back surface 412 and the front surface 411, and the through slot 46 is located between the first mounting slot 413 and the second mounting slot 414. The through groove 46 is located at the middle position of the top cover body 41. The explosion-proof valve 44 is accommodated in the through groove 46 and welded with the groove wall of the through groove 46. When the pressure in the energy storage device 1000 is too high, the explosion-proof valve 44 will automatically open to release the pressure, so as to prevent explosion. The top cover 40 also includes an explosion proof valve protection tab 441. The explosion-proof valve protection sheet 441 is disposed opposite to the explosion-proof valve 44. The explosion-proof valve protection piece 441 covers the through groove 46 and is flush with the front face 411 of the cap body 41.

The liquid filling hole 48 is provided between the first mounting groove 413 and the explosion-proof valve 44, and in the liquid filling process of the power battery, the electrolyte is filled into the battery through the liquid filling hole 48 in the top cover 40. The sealing plug 45 is fitted into the liquid filling hole 48 from the front face 411 of the cap body 41 and seals the liquid filling hole 48.

Referring to fig. 6, in the present embodiment, the top cover 40 is further provided with a plurality of notches. The plurality of notches include a plurality of first notches 471 and a plurality of second notches 472, the plurality of first notches 471 are disposed around the periphery of the first through hole 42, and the plurality of first notches 471 are disposed at intervals. The second notches 472 are spaced around the periphery of the second through hole 43, and the second notches 472 are spaced.

In the present embodiment, in the thickness direction of the top cover 40, the outer contour of the first notch 471 is in the shape of a gear tooth, and the first notch 471 is recessed from the front surface 411 of the top cover body 41 toward the back surface 412 and is communicated with the first through hole 42; it will be appreciated that the first notch 471 is provided with openings on both the front face 411 and the wall of the first through hole 42. The first notch 471 includes a first wall 4711 and two oppositely disposed second walls 4712, the two second walls 4712 connect opposite sides of the first wall 4711, the first wall 4711 is longer than the second wall 4712, and the two second walls 4712 connect with the walls of the first through hole 42. The first wall 4711 may be understood as an inner wall of the first notch 471, and the first wall 4711 is disposed opposite the back 412 of the top cover body 41.

In the present embodiment, in the thickness direction of the top cover 40, the outer contour of the second notch 472 is in a gear tooth shape, and the second notch 472 may be recessed from the front face 411 of the top cover body 41 toward the back face 412 and is in communication with the second through hole 43; it is understood that the second notch 472 is provided with openings on both the front face 411 and the wall of the second through hole 43. The second notch 472 includes a third wall 4721 and two fourth walls 4722 disposed opposite to each other, the two fourth walls 4722 connecting opposite sides of the third wall 4721, the third wall 4721 being longer than the fourth wall 4722, the two fourth walls 4722 being connected to the wall of the second through hole 43. The third wall 4721 may be understood as an inner wall of the second notch 472, and the third wall 4721 is disposed opposite the back 412 of the top cover body 41.

Referring to fig. 4, 5 and 7, in the present embodiment, the upper plastic component 70 includes a first upper plastic 71 and a second upper plastic 72. In this embodiment, the first upper plastic 71 and the second upper plastic 72 are both annular bodies. The first upper plastic 71 has a first protruding ring 711 disposed at one side, and the first protruding ring 711 and the first upper plastic 71 are coaxially disposed for filling the first ring groove 52 of the first pole 50. The second upper plastic 72 is provided with a second protruding ring 721, and the second protruding ring 721 is coaxially disposed with the second upper plastic 72 for filling the second ring groove 62 of the second post 60.

In this embodiment, the end cap assembly 100 also includes two seals. Specifically, the two seals are a first seal 81 and a second seal 82, respectively. The first seal 81 and the second seal 82 are both annular elastic members, which may be made of a rubber material.

Referring to fig. 4 and 5 in combination, in the present embodiment, the lower plastic 10 includes a lower plastic body 11. The lower plastic body 11 is a substantially rectangular thin plate, and includes a first surface 111 and a second surface 112 along a thickness direction (Z-axis direction) of the lower plastic body 11, where the first surface 111 and the second surface 112 are disposed opposite to each other.

In this embodiment, the lower plastic 10 includes two post through holes and two grooves. The two post through holes are a first post through hole 12 and a second post through hole 14 respectively, and the two grooves are a first groove 13 and a second groove 15 respectively. The first groove 13 and the first pole through hole 12 are coaxially disposed, and are disposed near an end of the lower plastic body 11. The first pole through hole 12 is used for the first pole 50 to pass through. The first groove 13 is for receiving the first flange 51. The first groove 13 is recessed from the second surface 112 toward the first surface 111, and a first retaining protrusion 131 is formed on the first surface 111. The first post through hole 12 is a circular through hole, the first post through hole 12 penetrates through the first surface 111 and the second surface 112, and the first post through hole 12 penetrates through the bottom wall of the first groove 13, that is, penetrates through the first clamping protrusion 131.

In this embodiment, the second recess 15 and the second post through hole 14 are coaxially disposed, and are disposed near the other end of the lower plastic body 11. The second post via 14 is for the second post 60 to pass through. The second groove 15 is for receiving the second flange 61. The second groove 15 is recessed from the second surface 112 toward the first surface 111, and a second retaining protrusion 151 is formed on the first surface 111. The second post through hole 14 is a circular through hole, the second post through hole 14 penetrates through the first surface 111 and the second surface 112, and the second post through hole 14 penetrates through the bottom wall of the second groove 15, that is, penetrates through the second clamping protrusion 151.

As shown in fig. 7, the lower plastic 10 is laminated and connected with the top cover 40. The length of the lower plastic 10 is the same as the length of the top cover 40, and the width of the lower plastic 10 is comparable to the width of the top cover 40, wherein a certain tolerance range is allowed. The lower plastic 10 is laminated to the back 412 of the top cover 40. Specifically, the first surface 111 of the lower plastic 10 is opposite to and adhered to the back surface 412 of the top cover 40. The first catching protrusion 131 is inserted into the first mounting groove 413, and the second catching protrusion 151 is inserted into the second mounting groove 414; the first clamping protrusion 131 and the first mounting groove 413 can be mutually clamped to achieve mutual positioning, and the second clamping protrusion 151 and the second mounting groove 414 can be mutually clamped to achieve mutual positioning. Along the thickness direction (Z-axis direction) of the top cover 40, the first post through hole 12 of the lower plastic 10 is disposed opposite to and communicates with the first through hole 42 of the top cover 40, and the second post through hole 14 is disposed opposite to and communicates with the second through hole 43 of the top cover 40.

The first sealing element 81 is sleeved on the first pole 50, the first pole 50 passes through the first pole through hole 12 and the first through hole 42, the first flange 51 is located in the first groove 13, the first sealing element 81 is located in the first pole through hole 12, the first upper plastic 71 is sleeved on the periphery of the first pole 50 and is connected with the front 411 of the top cover body 41, and the first convex ring 711 of the first upper plastic 71 is located in the first annular groove 52 of the first pole 50 and is clamped between the first through hole 42 and the first annular groove 52 of the first pole 50. The first upper plastic 71 is connected to the first through hole 42 and the first ring groove 52 at the contact position. The first seal 81 is sandwiched between the cap body 41 and the first flange 51. Specifically, along the thickness direction of the end cap assembly 100, the first sealing member 81 is partially clamped between the surface of the first flange 51 located at the periphery of the first pole 50 and the back surface 412 of the top cap body 41, and partially clamped between the first supporting surface 511 of the first flange 51 and the first upper plastic 71, and seals the first pole through hole 12. It will be appreciated that the first seal 81 is compressed between the first flange 51 and the top cover 40, the first upper plastic 71, and seals the first post through hole 12.

In this embodiment, when the first post 50 is fixed to the lower plastic 10 and the top cover 40, an interconnecting force is generated, the first sealing member 81 is pressed and deformed in the thickness direction of the end cover assembly 100, the compression amount of the first sealing member 81 is greater than 30%, and the compressed width W3 of the first sealing member 81 is 2.58mm in the radial direction of the first through hole 42. It can be understood that, after the first sealing member 81 is extruded and deformed, the radial deformation of the first through hole 42 is the radial width of the first sealing member 81, the radial width is greater than the width of the first notch 471 of the top cover 40, and the difference H1 between the two widths is 1mm. Along the radial direction of the first through hole 42, the width of the first sealing member 81 is greater than the width of the first notch 471 of the top cover 40, so that the top cover body 41 with larger thickness and strength can be in press connection with part of the first sealing member 81, thereby the first sealing member 81 between the first pole 50, the lower plastic 10 and the top cover 40 is not easy to deform due to resilience force under the extrusion of larger compression amount, and the sealing performance among the first pole 50, the lower plastic 10 and the top cover 40 is further improved.

The second sealing member 82 is sleeved on the second post 60, the second post 60 passes through the second post through hole 14 and the second through hole 43, the second flange 61 is positioned in the second groove 15, the second sealing member 82 is positioned in the second post through hole 14, the second upper plastic 72 is sleeved on the periphery of the second post 60 and connected with the front 411 of the top cover body 41, and the second convex ring 721 of the second upper plastic 72 is positioned in the second ring groove 62 of the second post 60 and clamps the second through hole 43 and the second post 60. The second upper plastic 72 is connected to the contact positions of the second through hole 43 and the second ring groove 62. The second seal 82 is sandwiched between the cap body 41 and the second flange 61. Specifically, along the thickness direction of the end cap assembly 100, the second sealing member 82 is partially clamped between the surface of the second flange 61 located at the periphery of the second post 60 and the back surface 412 of the top cap body 41, and partially clamped between the second supporting surface 611 of the second flange 61 and the second upper plastic 72, and seals the second post through hole 14. It will be appreciated that the second seal 82 is compressed between the second flange 61 and the top cover 40, the second upper plastic 72, and seals the second post through hole 14.

In this embodiment, when the second post 60 is fixed to the lower plastic 10 and the top cover 40, an interconnecting force is generated, the second sealing member 82 is pressed and deformed in the thickness direction of the end cover assembly 100, and the compression amount of the second sealing member 82 is greater than 30%, and in the radial direction of the second through hole 43, the compressed width of the second sealing member 82 is 2.58mm. It can be understood that, after the second sealing member 82 is extruded and deformed, the radial deformation of the second through hole 43 is the radial width of the second sealing member 82, the radial width is greater than the width of the second notch 472 of the top cover 40, and the difference H1 between the two widths is 1mm. Along the radial direction of the second through hole 43, the width of the second sealing member 82 is greater than the width of the second notch 472 of the top cover 40, so that the top cover body 41 with greater thickness and strength can be in press connection with part of the second sealing member 82, thereby the second sealing member 82 between the second post 60, the lower plastic 10 and the top cover 40 is not easy to deform due to resilience force under the compression of a larger compression amount, and the sealing performance among the second post 60, the lower plastic 10 and the top cover 40 is further improved.

In the present embodiment, the thickness D1 of the cap body 41 is 1.72mm. The distance H2 between the first wall 4711 of the first notch 471 and the back face 412 of the top cover body 41 is 1.21mm. The thickness D2 of the first flange 51 is 1.83mm. The width W1 of the narrowest portion of the first flange 51 is 2.9mm (see fig. 4). In this way, the peripheral edge of the first through hole 42 of the top cover 40 and the first flange 51 can be ensured to have enough thickness, and the structural strength of the peripheral edge of the first through hole 42 and the first flange 51 is ensured, so that when the compression amount of the first sealing element 81 is more than 30%, the first sealing element 81 can be prevented from being compressed and then rebounded to push and deform the first flange 51 or the first through hole 42 of the top cover 40.

In this embodiment, the distance between the third wall 4721 of the second notch 472 and the back 412 of the cap body 41 is 1.21mm. The thickness of the second flange 61 is 1.83mm. The width W2 of the narrowest portion of the second flange 61 is 2.9mm (see fig. 4). In this way, the peripheral edge of the second through hole 43 of the top cover 40 and the second flange 61 can be ensured to have enough thickness, and the structural strength of the peripheral edge of the first through hole and the second flange 61 is ensured, so that when the compression amount of the second sealing element 82 is more than 30%, the second sealing element 82 can be prevented from being compressed and then rebounded to push and deform the second flange 61 or the top cover 40.

Referring to fig. 7, in the present embodiment, the depth of the first groove 13 is smaller than the thickness of the first flange 51. The first flange 51 is partially accommodated in the first groove 13 and fixedly connected with the lower plastic body 11, and the other part protrudes out of the first groove 13, i.e. protrudes out of the second surface 112 of the lower plastic body 11. The height H3 of the first flange 51 protruding from the second surface 112 of the lower plastic body 11 is 1.56mm. In the embodiment of the present application, since the compression amount of the first sealing member 81 is greater than 30%, the first flange 51 has a larger resilience, and thus a sufficient thickness (the thickness D2 of the first flange 51 is 1.83 mm) is required for resisting the resilience of the first sealing member 81, so that the first flange 51 protrudes from the second surface 112 of the lower plastic body 11.

In this embodiment, the depth of the second groove 15 is smaller than the thickness of the second flange 61. The second flange 61 is partially accommodated in the second groove 15 and is fixedly connected with the lower plastic body 11, and the other part of the second flange protrudes out of the second groove 15, i.e. protrudes out of the second surface 112 of the lower plastic body 11. The height of the second flange 61 protruding from the second surface 112 of the lower plastic body 11 is 1.56mm. In the embodiment of the present application, since the compression amount of the second sealing member 82 is greater than 30%, the second flange 61 has a larger resilience, and thus a sufficient thickness (the thickness of the second flange 61 is 1.83 mm) is required to resist the resilience of the second sealing member 82, so that the second flange 61 protrudes from the second surface 112 of the lower plastic body 11.

It should be noted that, in the present embodiment, the first upper plastic 71 and the second upper plastic 72 are formed by in-mold injection molding after the lower plastic 10, the first pole 50, the second pole 60 and the top cover 40 are assembled, that is, the positions and connection relationship with the first pole 50, the second pole 60 and the top cover 40 and the lower plastic 10 are generated during the forming process; for example, the first convex ring 711 of the first upper plastic 71 is directly formed in the first annular groove 52 of the first pole 50, and is clamped between the first through hole 42 and the first pole 50. The second convex ring 721 of the second upper plastic 72 is directly formed in the second ring groove 62 of the second post 60, and is clamped between the second through hole 43 and the second post 60.

In this embodiment, there are two adapters, namely, a first adapter 310 and a second adapter 320. The first adapter 310 and the second adapter 320 will be described in detail below with reference to the accompanying drawings.

Referring to fig. 8 in combination, the first adapter 310 is a substantially C-shaped conductive sheet and includes a first body 311, a first adapter 312 and a second adapter 313, the first adapter 312 and the second adapter 313 are rectangular sheets, the first adapter 312 and the second adapter 313 are respectively connected to opposite sides of the first body 311, and the first adapter 312 and the second adapter 313 are both far from the first body 311 and extend parallel to the first body 311. The first adapter 312 has a first connection segment 3120, the second adapter 313 has a second connection segment 3130, and the first connection segment 3120 and the second connection segment 3130 are spaced apart and extend in the same direction. The first body 311, the first adapter 312 and the second adapter 313 may be integrally formed structures, and the first adapter 312 and the second adapter 313 may be symmetrical with respect to a center line of the first body 311 in a length direction. Wherein, the first body 311 is used for welding with the first flange 51. The first adapter 312 and the second adapter 313 are used for connecting the first tabs 220 of the two pole cores 210. In the present embodiment, the first tab 220 and the first adapter 310 are welded by ultrasonic. Specifically, the two first tabs 220 are welded to the first adapter 312 and the second adapter 313 by ultrasonic waves.

The first body 311 has a first face 3111, the first adapter 312 has a second face 3121, and the second adapter 313 has a third face 3131. The first face 3111 connects the second face 3121 and the third face 3131; the first face 3111, the second face 3121, and the third face 3131 constitute one surface of the first adapter 310. Wherein the first face 3111 may be understood as a body surface of the first adapter 310. The first tab 312 may be understood as a first welded portion of the first tab 310, and the second surface 3121 may be welded to one of the first tabs 220, and may be understood as a first welded surface of the first tab 310. The second adapter 313 may be understood as a second welding portion of the first adapter 310, and the third face 3131 may be welded to the other first tab 220, and may be understood as a second welding face of the first adapter 310. The first adapter 312 and the second adapter 313 are bent relative to the first body 311 in a direction opposite to the first surface 3111. At this time, the other side surface of the first adapter 310 is a stepped surface, that is, the other side of the first body 311, the first adapter 312, and the second adapter 313 in the thickness direction of the first adapter 310 is a stepped surface. The other side surface of the first adapter 310 may be a plane (not shown), that is, the other side of the first body 311, the first adapter 312, and the second adapter 313 in the thickness direction of the first adapter 310 may be a plane. Along the thickness direction of the first joint 310, i.e., the Z-axis direction, the first surface 3111 has a height difference S1 from both the second surface 3121 and the third surface 3131. Specifically, the difference in height S1 between the first surface 3111 and the second and third surfaces 3121 and 3131 is 0.85mm. Like this for there is sufficient distance in first adapter 310 to the tip of utmost point core 210, can understand to compare the high lifting in utmost point core 210 with the welded position of first utmost point ear 220, it is crooked to provide bigger radian for first utmost point ear 220 to buckle (buckle 90 degrees to the welding of horizontal direction and first adapter 310 from the vertical direction of utmost point core 210), avoid the utmost point ear to buckle the arc degree and be too little, the utmost point ear excessively buckles and cause the fracture, promote battery security performance, simultaneously still can avoid the battery to use the back for a long time, first utmost point ear 220 is heated crooked, insert in the core is rolled up to the below downwards, cause the battery internal short circuit.

In the present embodiment, the first adapter 312 also has a first upper surface 3122 disposed opposite the second surface 3121. The second adapter 313 further has a second upper surface 3132 disposed opposite the third surface 3131.

The second adapting piece 320 is a C-shaped conductive sheet, and includes a second body 321, a third adapting body 322 and a fourth adapting body 323, the third adapting body 322 and the fourth adapting body 323 are rectangular sheets, the third adapting body 322 and the fourth adapting body 323 are respectively connected with two opposite sides of the second body 321, the third adapting body 322 and the fourth adapting body 323 are far away from the second body 321 and extend parallel to the first body 311, the third adapting body 322 has a third connecting section 3220, the fourth adapting body 323 has a fourth connecting section 3230, and the third connecting section 3220 and the fourth connecting section 3230 are arranged at intervals and have the same extending direction. The second body 321, the third adapter 322 and the fourth adapter 323 may be integrally formed structures, and the third adapter 322 and the fourth adapter 323 may be symmetrical with respect to the center line of the second body 321 in the length direction. Wherein the second body 321 is adapted to be welded to the second flange 61. The third adapter 322 and the fourth adapter 323 are used for connecting the second lugs 230 of the two pole cores 210. In the present embodiment, the second tab 230 and the first adapter 310 are welded by ultrasonic waves. Specifically, the two second tabs 230 are ultrasonically welded to the third adapter 322 and the fourth adapter 323.

The second body 321 has a fourth face 3211, the third adapter 322 has a fifth face 3221, and the fourth adapter 323 has a sixth face 3231. Fifth side 3221 connects fourth side 3211 and sixth side 3231; fifth face 3221, fourth face 3211 and sixth face 3231 constitute one surface of second adapter 320. The fourth face 3211 may be understood as a body surface of the second adaptor 320. The third adapter 322 may be understood as a first welding portion of the second adapter 320, and the fifth surface 3221 is welded to one of the second lugs 230, which may be understood as a first welding surface of the second adapter 320. The fourth adapter 323 may be understood as a second welding portion of the second adapter 320, and the sixth face 3231 welded to the other second tab 230 may be understood as a second welding surface of the second adapter 320. The third adapter 322 and the fourth adapter 323 are bent towards the direction opposite to the fourth surface 3211 relative to the second body 321. At this time, the surface of the other side of the second adapter 320 is a flat surface, that is, the other side of the first body 311, the first adapter 312, and the second adapter 313 in the thickness direction of the first adapter 310 is a stepped surface. The other side surface of the second adapter 320 may be a plane (not shown), that is, the other sides of the second body 321, the third adapter 322, and the fourth adapter 323 in the thickness direction of the second adapter 320 may be a plane. The difference in height S2 between the fourth face 3211 and the fifth face 3221 and sixth face 3231 along the thickness direction, i.e., the Z-axis direction, of the second adapting member 320 is 0.85mm. In this way, the second adapter 320 is sufficiently spaced from the end of the pole core 210, so that the welding position of the second lug 230 can be lifted up by the height of the pole core 210, a larger arc is provided for bending the second lug 230 (bending 90 degrees from the vertical direction of the pole core 210 to welding with the second adapter 320 in the horizontal direction), breakage caused by too small bending arc of the lug and excessive bending of the lug is avoided, the safety performance of the battery is improved, and meanwhile, the situation that the second lug 230 is heated and bent after the battery is used for a long time and is downwards inserted into the lower winding core to cause internal short circuit of the battery can be avoided.

In the present embodiment, the third adapter 322 further has a third upper surface 3222 disposed opposite to the fifth surface 3221. The fourth adapter 323 also has a fourth upper surface 3232 disposed opposite the sixth surface 3231.

Referring to fig. 9, 10 and 12, in the present embodiment, the lower plastic 10 further includes an explosion-proof fence 16. The explosion-proof fence 16 is arranged in the middle of the lower plastic body 11 and is arranged opposite to the explosion-proof valve 44 of the top cover 40. The lower plastic body 11 and the explosion-proof fence 16 may be an integrally formed structural member. The explosion-proof fence 16 protrudes from the second surface 112 of the lower plastic 10 to protect the explosion-proof valve 44 and ensure the reliability of opening the explosion-proof valve 44. Because the energy storage device 1000 is in transportation and use, the tab or the blue film is easy to break to generate fragments, the fragments of the tab or the blue film can be prevented from floating below the explosion-proof valve 44 by arranging the explosion-proof fence 16, shielding of an air passage is avoided, explosion-proof failure is further caused, the tab can be prevented from drifting to the explosion-proof valve 44, and short circuit between the electric connection electrode and the top cover 40 is avoided.

In the present embodiment, the explosion-proof fence 16 protrudes from the second surface 112 of the lower plastic body 11, and a recess 16A is formed on the first surface 111 of the lower plastic body 11, wherein the recess 16A is a cuboid. The explosion barrier 16 includes two opposing end walls (not shown), a first side wall 161, a second side wall 162, and a bottom wall 163. Both end walls, a first side wall 161 and a second side wall 162 are connected to the bottom wall 163. Along the length direction of the lower plastic 10, the first side wall 161 and the second side wall 162 are disposed opposite to each other, and the first side wall 161 and the second side wall 162 are connected to the second surface 112 of the lower plastic body 11 and form an included angle with the second surface 112. In this embodiment, the bottom wall 163 of the explosion-proof fence 16 is provided with a plurality of through holes 18 (i.e. flow guiding through holes 18) arranged at intervals. Along the thickness direction of the lower plastic 10, a plurality of through holes 18 penetrate through the bottom wall 163 of the explosion-proof barrier 16. The through hole 18 can provide an air inlet channel of the air collecting chamber below the explosion-proof valve 44, so that the air generated in the battery cell can flow into and collect in the air collecting space below the explosion-proof valve 44 through the through hole 18, and the explosion-proof valve 44 is ensured to be effectively opened.

In this embodiment, the bottom wall 163 includes an inner surface 1632 and an outer surface 1631, the inner surface 1632 and the outer surface 1631 are disposed opposite to each other along the thickness direction of the lower plastic 10, the inner surface 1632 is located in the recess 16A, that is, a groove wall surface of the recess 16A, and the outer surface 1631 exposes the second surface 112. A plurality of through holes 18 extend through the inner surface 1632 and the outer surface 1631 of the bottom wall 163.

In the present embodiment, along the thickness direction of the lower plastic 10, the first sidewall 161 and the second sidewall 162 are disposed obliquely compared to the thickness direction of the lower plastic 10; specifically, in fig. 10, the O-O line is a reference line in the thickness direction of the lower plastic 10, the first sidewall 161 forms a first angle θ1 with the reference line in the thickness direction of the lower plastic 10, the second sidewall 162 forms a second angle θ2 with the reference line in the thickness direction of the lower plastic 10, and the angle ranges of the first angle θ1 and the second angle θ2 are respectively 2-15 degrees. Such as 3 degrees, 5 degrees, 8 degrees, 12 degrees.

The junction of the outer surface 1631 of the bottom wall 163 and the outer surface of the first side wall 161 is an arc surface, and the junction of the outer surface 1631 of the bottom wall 163 and the outer surface of the second side wall 162 is an arc surface. In the embodiment of the application, the joint between the outer surface 1631 of the bottom wall 163 and the outer surface of the second side wall 162 is an arc surface, so that the plastic liquid can be smoothly cast to fill the mold during injection molding of the lower plastic 10, the bottom wall 163 of the complete explosion-proof fence 16 is ensured to be formed, the structural defect of the bottom wall 163 of the explosion-proof fence 16 is reduced, and the structural strength and the product yield of the lower plastic 10 are improved.

The explosion protection barrier 16 includes a plurality of vent holes 17, and the plurality of vent holes 17 are provided at the first sidewall 161 and the second sidewall 162, respectively. Specifically, the plurality of deflector holes 17 includes a first deflector hole 17a and a second deflector hole 17b, the first deflector hole 17a is provided on the first side wall 161, and along the width direction of the first side wall 161, the first deflector hole 17a penetrates the first side wall 161 and communicates with the recess 16A. The first deflector hole 17a also penetrates the first surface 111. It is understood that a portion of the first deflector hole 17a is recessed from the first surface 111 to communicate with the first sidewall 161, the first deflector hole 17a forms a first hole wall 171 on the first sidewall 161, and the first hole wall 171 is located on one side of the first surface 111 and faces away from the second surface 112. The second deflector hole 17b is provided in the second side wall 162, and the second deflector hole 17b penetrates the second side wall 162 along the width direction of the second side wall 162 and communicates with the recess 16A. The second deflector hole 17b also penetrates the first surface 111. It is understood that a portion of the second deflector hole 17b is recessed from the first surface 111 to communicate with the second sidewall 162, and the second deflector hole 17b forms a second hole wall 172 on the second sidewall 162, and the second hole wall 172 is located on one side of the first surface 111 and faces away from the second surface 112.

In this embodiment, by arranging the diversion hole 17 on the side wall of the explosion-proof fence 16, the diversion hole 17 can provide a lateral air inlet channel of the air collecting chamber below the explosion-proof valve 44, when the electrode assembly 200 expands or shakes due to long-term use, the plastic 10 is extruded down, or the insulating film loses viscosity due to long-term use, so that other diffusion channels such as the through hole 18 of the explosion-proof fence 16 are blocked by the cell, and the gas generated in the cell can flow from the diversion hole 17 on the wall surface of the explosion-proof fence 16 and collect into the air collecting space below the explosion-proof valve 44, so as to ensure that the explosion-proof valve 44 is effectively opened.

In the thickness direction of the lower plastic 10, the first diversion holes 17a and the second diversion holes 17b penetrate through the lower plastic body 11, so that the heights of the first diversion holes 17a and the second diversion holes 17b are increased, and the risk that one end of the broken tab drift stretches into the first diversion holes 17a and/or the second diversion holes 17b and is overlapped with the top cover 40 to cause short circuit can be reduced; and because the first diversion hole 17a penetrates through the lower plastic body 11 and the first side wall 161, and the second diversion hole 17b penetrates through the lower plastic body 11 and the second side wall 162, the corner structure of the connection part of the first side wall 161, the second side wall 162 and the lower plastic body 11 of the explosion-proof fence 16 is damaged, thereby being beneficial to releasing stress when the lower plastic body 11 is subjected to external force and avoiding deformation of the lower plastic body 11.

In the present embodiment, the first deflector hole 17a and the second deflector hole 17b are disposed opposite to each other. The number of the first and second guide holes 17a and 17b may be two, respectively. The two first deflector holes 17a are provided in one-to-one correspondence with the two second deflector holes 17 b. In other embodiments, the number of the first and second guide holes 17a and 17b may be one or more than two, respectively. In this embodiment, the diversion holes 17 are rectangular, which can facilitate the processing of the lower plastic 10. At the same time, the arrangement of the diversion holes 17 is more orderly, so that a plurality of diversion holes 17 are arranged on the first side wall 161 and/or the second side wall 162 of the explosion-proof fence 16.

It can be understood that, because the first side wall 161 and the second side wall 162 are disposed obliquely with respect to the thickness direction of the lower plastic 10 along the thickness direction of the lower plastic 10, when the lower plastic 10 is injection molded, the movable mold for preparing the lower plastic 10 has a bump on one side where the diversion hole 17 is formed and is in oblique contact with the fixed mold (the area for preparing the explosion-proof fence 16 in the middle of the fixed mold cavity is an inverted trapezoid structure with a large top and a small bottom), so as to seal the plastic runner to form the rectangular diversion hole 17; the movable die and the fixed die are obliquely abutted, so that the die machining and precision requirements can be reduced, and the manufacturing cost of the lower plastic 10 is further reduced. In addition, after the molten plastic liquid is injected into the injection port, when the plastic liquid flows to the position forming the explosion-proof fence 16 in the mold cavity, the plastic liquid is obliquely injected at a certain angle (a first included angle theta 1 and a second included angle theta 2), so that the plastic liquid is prevented from entering the runner in a right angle, and the plastic liquid impacts the wall surface of the mold to form vortex, and the structural strength of the corner fence is guaranteed to be reduced.

In this embodiment, the explosion-proof barrier 16 further includes a first reinforcing rib 191 and a second reinforcing rib 192. The first reinforcing rib 191 and the second reinforcing rib 192 are located in the concave portion 16A, and the first reinforcing rib 191 and the second reinforcing rib 192 are protruded on the inner surface 1632 of the bottom wall 163 of the explosion-proof fence 16 in the thickness direction (Z-axis direction) of the lower plastic body 11.

The first reinforcing ribs 191 extend in the width direction (Y-axis direction) of the lower plastic body 11. The second reinforcing ribs 192 extend along the length direction (X-axis direction) of the lower plastic body 11. The number of the second reinforcing ribs 192 may be two. Two second reinforcing ribs 192 are respectively connected to both ends of the first reinforcing rib 191. The first reinforcing ribs 191 and the second reinforcing ribs 192 are in an i shape, which is advantageous for improving the structural strength of the explosion-proof fence 16.

Referring to fig. 12, along the thickness direction (Z-axis direction) of the lower plastic body 11, the second end face 1921 of the second reinforcing rib 192 facing away from the bottom wall 163 of the explosion-proof fence 16 is flush with the first surface 111 of the lower plastic body 11. The height H4 of the first reinforcing rib 191 protruding from the inner surface 1632 of the bottom wall 163 of the explosion-proof fence 16 is smaller than the depth of the recess 16A, that is, the distance from the first surface 111 to the inner surface 1632 of the bottom wall 163. It will be understood that the first reinforcing rib 191 has a first end surface 1911, the first end surface 1911 is lower than the first surface 111 of the lower plastic body 11, and in this embodiment, the height difference H5 between the first end surface 1911 and the first surface 111 is 0.45-2.25mm, that is, the height of the first reinforcing rib 191 is lower than the height of the second reinforcing rib 192, and the height difference is 0.45-2.25mm.

It will be appreciated that, due to the height difference between the first end surface 1911 of the first stiffener 191 and the first surface 111 of the lower plastic body 11, a gap exists between the first end surface 1911 of the first stiffener 191 and the back surface 412 of the top cover 40 when the lower plastic 10 is adhered to the top cover 40. The first diversion holes 17a and the second diversion holes 17b of the explosion-proof fence 16 are respectively positioned at two sides of the first reinforcing rib 191, and when gas enters the gas collecting space below the explosion-proof valve 44 from the first diversion holes 17a and the second diversion holes 17b of the explosion-proof fence 16, the gas can be conducted mutually through gaps between the first end face 1911 of the first reinforcing rib 191 and the back face 412 of the top cover 40, so that the uniform gas pressure in the gas collecting space is ensured.

Referring to fig. 11 and 12 in combination, the end cap assembly 100 is coupled to the first adapter 310 and the second adapter 320. Specifically, the first adaptor 310 is connected to the first pole 50, the first adaptor 310 is laminated on the second surface 112 of the lower plastic body 11, and the first adaptor 310 is connected to the first flange 51 by welding or the like. Since the first flange 51 protrudes from the second surface 112 of the lower plastic body 11, after the first adaptor 310 is welded to the first flange 51, a gap S3 exists between the first upper surface 3122 of the first adaptor 312, the second upper surface 3132 of the second adaptor 313, and the second surface 112 of the lower plastic 10. Along the thickness direction (Z-axis direction) of the end cap assembly 100, the gap S3 between the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the second surface 112 of the lower plastic 10 is 0.8-0.85mm. The gap is used for preventing the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the lower plastic body 11 from rubbing, and also is used for accommodating the insulating film attached to the first upper surface 3122 of the first adapter 312 and the second upper surface 3132 of the second adapter 313, so that the insulating film blocks the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the lower plastic body 11 from rubbing.

Specifically, the gap S3 between the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313, and the second surface 112 of the lower plastic body 11 is 0.85mm.

In this embodiment, an insulating film (not shown) is further disposed between the first adapter 312 and the second adapter 313 and the second surface 112. Specifically, an insulating film may be attached to the first upper surface 3122 of the first adapter 312 and the second upper surface 3132 of the second adapter 313. That is, the insulating film is located in the gap between the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313, and the second surface 112 of the lower plastic body 11. The insulating film can prevent the surfaces of the first adapter 312 and the second adapter 313 from rubbing against the lower plastic body 11, and prevent the metal chips generated by the rubbing of the indentations formed by welding the first adapter 310 and the first flange 51 and the lower plastic body 11 from falling into the pole core 210, so as to cause internal short circuit of the battery.

In the present embodiment, the first tab 220 and the first adapter 310 are welded by ultrasonic. Specifically, the two first tabs 220 are respectively welded to a portion of the second surface 3121 of the first adapter 312 and a portion of the third surface 3131 of the second adapter 313 by ultrasonic waves.

It can be appreciated that when the first tab 220 is welded to the first adapter 310, a plurality of prismatic indentations are formed in the first adapter 312 and the second adapter 313 due to the extrusion of the ultrasonic horn. When the ultrasonic welding is completed and the ultrasonic welding head is separated, tiny metal burrs are pulled out at the edges of the prismatic indentations. In the embodiment of the application, a gap of 0.8-0.85mm exists between the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the second surface 112 of the lower plastic 10, so that the situation that after the first adapter 310 is fixedly connected with the first flange 51, the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the lower plastic body 11 are scratched to cause the metal burrs to scratch the insulating film and scratch the inside of the winding core to cause the internal short circuit of the battery can be prevented.

After the two first tabs 220 are welded to the first adapter 312 and the second adapter 313, the heights of the two first tabs 220 protruding from the second surface 3121 and the third surface 3131 respectively are 0.65mm. Like this, the welding position of first utmost point ear 220 compares in the high lifting of utmost point core 210, for first utmost point ear 220 buckle (buckle 90 degrees to the welding of horizontal direction and first adaptor 310 from the vertical direction of utmost point core 210), provide bigger radian, avoid the utmost point ear to buckle the arc degree too little, the utmost point ear excessively buckles and cause the fracture, promote battery security performance, simultaneously can also avoid the battery to use the back for a long time, first utmost point ear 220 is heated crooked, insert in the core is rolled up to the below downwards, cause the battery internal short circuit.

In this embodiment, the second adaptor 320 is connected to the second post 60 and is spaced apart from the second surface 112 of the lower plastic 10. Specifically, the second adaptor 320 is laminated on the second surface 112 of the lower plastic body 11, and the second adaptor 320 is connected to the second flange 61 by welding or the like. Since the second flange 61 protrudes from the second surface 112 of the lower plastic body 11, after the second adapter 320 is welded with the second flange 61, a gap S3 exists between the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323, and the second surface 112 of the lower plastic 10. The gaps between the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323 and the second surface 112 of the lower plastic 10 along the thickness direction (Z-axis direction) of the end cap assembly 100 are 0.8-0.85mm. The gap can be used for preventing the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323 and the lower plastic body 11 from rubbing, and can also be used for accommodating an insulating film attached to the third upper surface 3222 of the third adapter 322 and the fourth upper surface 3232 of the fourth adapter 323, so that the insulating film can prevent the third upper surface 3222 of the third adapter 322 and the fourth upper surface 3232 of the fourth adapter 323 from rubbing with the lower plastic body 11.

Specifically, the clearance between the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323 and the second surface 112 of the lower plastic body 11 is 0.85mm.

In this embodiment, an insulating film (not shown) is further disposed between the third adapter 322 and the fourth adapter 323 and the second surface 112. Specifically, an insulating film may be attached to the third upper surface 3222 of the third adapter 322 and the fourth upper surface 3232 of the fourth adapter 323. That is, the insulating film is located at the gap between the third upper surface 3222 of the third adapter 322 and the fourth upper surface 3232 of the fourth adapter 323 and the second surface 112 of the lower plastic body 11. The insulating film can prevent the surfaces of the third adapter 322 and the fourth adapter 323 from rubbing against the lower plastic body 11, and prevent the metal scraps generated by rubbing against the lower plastic body 11 from falling into the pole core 210 to cause internal short circuit of the battery due to the indentation of the second adapter 320 welded with the second flange 61.

In this embodiment, the second tab 230 and the second adapter 320 are welded by ultrasonic. Specifically, the two second tabs 230 are respectively welded to a portion of the fifth surface 3221 of the third adapter 322 and a portion of the sixth surface 3231 of the fourth adapter 323 by ultrasonic waves.

It will be appreciated that when the second tab 230 is welded to the second adapter 320, a plurality of prismatic indentations are formed in the third adapter 322 and the fourth adapter 323 due to the extrusion of the ultrasonic horn. When the ultrasonic welding is completed and the ultrasonic welding head is separated, tiny metal burrs are pulled out at the edges of the prismatic indentations. In the embodiment of the application, a gap of 0.8-0.85mm exists between the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323 and the second surface 112 of the lower plastic 10, so that the situation that metal burrs scratch the insulating film and scratch the inside of the winding core to cause internal short circuit of the battery due to scratch of the third upper surface 3222 of the third adapter 322, the fourth upper surface 3232 of the fourth adapter 323 and the lower plastic body 11 after the first adapter 310 is fixedly connected with the second flange 61 can be prevented.

After the two second lugs 230 are welded to the third adapter 322 and the fourth adapter 323, the two second lugs 230 protrude from the fifth surface 3221 and the sixth surface 3231 respectively to a height of 0.65mm. Like this, the welding position of second ear 230 is compared in the high lifting of utmost point core 210, for second ear 230 buckle (buckle 90 degrees to the welding of horizontal direction and second adapter 320 from the vertical direction of utmost point core 210), provide bigger radian, avoid the ear to buckle the arc degree too little, the excessive bending of utmost point ear causes the fracture, promote battery security performance, can also avoid the battery to use the back for a long time simultaneously, second ear 230 is heated crooked, insert in the below book core downwards, cause the battery internal short circuit.

The first hole wall 171 of the first deflector hole 17a and the second hole wall 172 of the second deflector hole 17b of the explosion-proof fence 16 are spaced apart from the back surface 412 of the roof body 41 by a distance L1. In the present embodiment, the gap values S3 and L1 between the first upper surface 3122 of the first adapter 312, the second upper surface 3132 of the second adapter 313 and the second surface 112 of the lower plastic body 11 satisfy the following relationship: l1 < S3. The first tab 220 has a height difference from the first hole wall 171 of the first deflector hole 17a, the second tab 230 has a height difference from the second hole wall 172 of the second deflector hole 17b in the thickness direction of the top cover 40. The first tab 220 and the second tab 230 are always located at one side of the deflector hole 17 away from the top cover body 41, that is, the first tab 220 is always lower than the first hole wall 171 of the first deflector hole 17a, and the second tab 230 is always lower than the second hole wall 172 of the second deflector hole 17 b. In this way, after the battery is used for a long time, if the first tab 220 and/or the second tab 230 are broken due to repeated temperature changes or shaking, the height difference between the first tab 220 and the first hole wall 171 of the first guide hole 17a, and the height difference between the second tab 230 and the second hole wall 172 of the second guide hole 17b can avoid the risk that the drifting end of the first tab 220 and/or the second tab 230 after breaking stretches into the first guide hole 17a and/or the second guide hole 17b and is overlapped with the top cover 40 to cause short circuit.

The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will have variations 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 energy storage device, comprising: the end cover assembly comprises a lower plastic body, wherein the lower plastic body comprises a first surface and a second surface along the thickness direction of the lower plastic body, and the first surface and the second surface are arranged in a back-to-back manner;

the lower plastic further comprises an explosion-proof fence, wherein the explosion-proof fence protrudes out of the second surface, and a concave part is formed on the first surface;

the anti-explosion fence comprises a first side wall, a second side wall and a bottom wall, wherein the bottom wall is connected with the first side wall and the second side wall, a plurality of through holes which are distributed at intervals are formed in the bottom wall, the first side wall and the second side wall are oppositely arranged along the length direction of the lower plastic, and the first side wall and the second side wall are connected with the lower plastic body;

The explosion-proof fence further comprises a plurality of diversion holes, the plurality of diversion holes comprise first diversion holes and second diversion holes, the first diversion holes are formed in the first side wall and penetrate through the first side wall along the width direction of the first side wall; the second diversion holes are formed in the second side wall and penetrate through the second side wall along the width direction of the second side wall, and the first diversion holes and the second diversion holes are communicated with the concave portions.

2. The energy storage device of claim 1, wherein along the thickness direction of the lower plastic, the first side wall forms a first included angle θ1 with a reference line of the thickness direction of the lower plastic, the second side wall forms a second included angle θ2 with a reference line of the thickness direction of the lower plastic, and the first included angle θ1 and the second included angle θ2 are respectively in an angle range of 2-15 degrees.

3. The energy storage device of claim 1, wherein the bottom wall includes an inner surface and an outer surface, the inner surface and the outer surface being disposed opposite to each other along a thickness direction of the lower plastic, and the inner surface being opposite to the second surface, and a junction between the outer surface of the bottom wall and the outer surface of the first side wall is an arc surface.

4. The energy storage device of claim 3, wherein the explosion-proof barrier further comprises a first reinforcing rib extending along a width direction of the lower plastic, the first reinforcing rib protruding from an inner surface of the bottom wall and being located in the recess along a thickness direction of the lower plastic; the first reinforcing rib is provided with a first end face, and the first end face is lower than the first surface along the direction from the first surface to the second surface.

5. The energy storage device of claim 4, wherein a height difference H5 between said first end surface and said first surface along a thickness direction of said lower plastic is 0.45-2.25mm.

6. The energy storage device of claim 5, comprising an adapter and an electrode assembly, the electrode assembly comprising two tabs, the adapter comprising a first weld and a second weld;

the end cover assembly comprises a top cover, a pole column and a flange arranged on the pole column, the top cover is laminated with and connected with the lower plastic, the pole column penetrates through the lower plastic and the top cover, the flange is positioned on the second surface, and the adapter is connected with the flange;

One tab is connected with the surface of the first welding part, which is opposite to the lower plastic, and the other tab is connected with the surface of the second welding part, which is opposite to the lower plastic.

7. The energy storage device of claim 6, wherein the lower plastic comprises a groove recessed in the second surface, the post passes through the lower plastic, the flange is received in the groove, and the flange protrudes from the second surface; and the height H3 of the flange protruding out of the second surface along the thickness direction of the lower plastic is 1.56mm.

8. The energy storage device of claim 7, wherein a gap S3 is provided between a surface of the first and second welding portions facing the lower plastic and the second surface in a thickness direction of the end cap assembly, and the gap S3 is 0.8-0.85mm.

9. The energy storage device of claim 8, wherein the first flow guiding hole forms a first hole wall on the first side wall, the second flow guiding hole forms a second hole wall on the second side wall, the first hole wall and the second hole wall are opposite to the second surface, and along a thickness direction of the lower plastic, a distance between the first hole wall and the second surface is L1, and the L1 and the gap S3 satisfy the relationship: l1 < S3.

10. The energy storage device of any of claims 6-9, wherein the adapter comprises a body, the first weld, and the second weld; the first welding part and the second welding part are connected to two opposite sides of the body, the body comprises a body surface, the surface of the first welding part welded with the tab is a first welding surface, and the surface of the second welding part welded with the tab is a second welding surface;

the first welding part and the second welding part are bent towards the direction opposite to the surface of the body relative to the body, and the surface of the body protrudes out of the first welding surface and the second welding surface along the direction from the top cover to the lower plastic.

11. The energy storage device of claim 10, wherein a height difference between the body surface and the first and second welding surfaces along a thickness direction of the end cap assembly is 0.85mm.

12. The energy storage device of any one of claims 6 to 9, wherein the tab protrudes from the first and second weld surfaces by a height of 0.65mm.

13. A powered device comprising an energy storage device according to any one of claims 1 to 12 for storing electrical energy.