CN115939691A

CN115939691A - End cover assembly, energy storage device and electric equipment

Info

Publication number: CN115939691A
Application number: CN202310091083.9A
Authority: CN
Inventors: 徐卫东; 熊永锋; 王烽
Original assignee: Xiamen Hithium Energy Storage Technology Co Ltd; Shenzhen Hairun New Energy Technology Co Ltd
Current assignee: Xiamen Hithium Energy Storage Technology Co Ltd; Shenzhen Hairun New Energy Technology Co Ltd
Priority date: 2023-02-09
Filing date: 2023-02-09
Publication date: 2023-04-07

Abstract

The application provides an end cover assembly, an energy storage device and electric equipment. The end cap assembly includes a metal compact having a first surface; the top cover is arranged on the first surface of the metal pressing block at intervals and is provided with through holes, and the orthographic projections of the through holes on the first surface fall into the range of the first surface; the stress piece is used for sealing the through hole and comprises a propping part, a deformation part and a connecting part which are sequentially bent and connected, the deformation part is arranged around the periphery of the propping part, and the connecting part is arranged around the periphery of the deformation part; the connecting part is connected with the top cover, and the deformation part is bent from one end of the connecting part, which is far away from the top cover, to the direction far away from the metal pressing block; the abutting part is provided with a second surface facing the metal pressing block, and when the abutting part is subjected to a preset pressure which is greater than or equal to the direction facing the metal pressing block, the maximum movable distance of the abutting part in the direction facing the metal pressing block is greater than the distance between the first surface and the second surface. The application of the end cover assembly to the energy storage device can improve the use safety of the energy storage device.

Description

End cover assembly, energy storage device and electric equipment

Technical Field

The application relates to the field of energy storage, concretely relates to end cover assembly, energy storage device and consumer.

Background

An energy storage device such as a secondary battery is usually provided with an explosion-proof valve or an explosion-proof sheet on an end cover assembly, so that when the air pressure in the energy storage device is increased, the explosion-proof valve or the explosion-proof sheet can be timely exploded to release the pressure. However, when the explosion-proof valve or the explosion-proof piece is exploded, the electrolyte is easily sputtered around. Therefore, the short circuit component is arranged on the end cover assembly, so that the pressure in the energy storage device is increased, before the pressure reaches the explosion pressure of the explosion-proof valve or the explosion-proof sheet, the anode and the cathode of the energy storage device are connected in a short circuit mode through the short circuit component, the energy storage device is prevented from being charged and discharged continuously, the pressure in the energy storage device is prevented from being increased continuously, and electrolyte is easy to sputter around when the explosion-proof valve or the explosion-proof sheet is exploded. However, the existing short-circuit component is unreasonable in design structure and often fails, so that the anode and the cathode of the energy storage device cannot be in short circuit instantly when the anode and the cathode need to be in short circuit connection.

Disclosure of Invention

To the above problem, the embodiment of the application provides an end cover assembly, and it is applied to energy memory, when energy memory internal pressure reached and predetermines pressure, can in time make energy memory take place the short circuit, improves the security that energy memory used.

A first aspect of the present application provides an end cap assembly for an energy storage device, the energy storage device including an electrode assembly comprising:

a metal compact for electrically connecting an electrode assembly of the energy storage device, the metal compact having a first surface;

the top cover is arranged on the first surface of the metal pressing block at intervals, and is provided with a through hole, and the orthographic projection of the through hole on the first surface falls into the range of the first surface; and

the stress piece is used for sealing the through hole and comprises a propping part, a deformation part and a connecting part which are sequentially bent and connected, the deformation part is arranged around the periphery of the propping part, and the connecting part is arranged around the periphery of the deformation part; the connecting part is connected with the top cover, and the deformation part is bent from one end of the connecting part, which is far away from the top cover, to the direction far away from the metal pressing block; when the abutting part is subjected to preset pressure approaching towards the direction of the metal pressing block, the abutting part abuts against the metal pressing block, and the energy storage device is in short circuit connection;

the abutting portion is provided with a second surface facing the metal pressing block, and when the abutting portion is subjected to a preset pressure which is larger than or equal to the approaching direction of the abutting portion towards the metal pressing block, the movable maximum distance of the abutting portion towards the approaching direction of the abutting portion towards the metal pressing block is larger than the distance between the first surface and the second surface.

Further, a range of a difference between a maximum movable distance s1 of the abutting portion toward a direction of approaching the metal compact and a distance s2 between the first surface and the second surface is: s1-s2 is more than or equal to 2.6mm and less than or equal to 3.4mm.

Furthermore, the range of the movable maximum distance s1 of the supporting part towards the direction close to the metal pressing block is 2.8 mm-5.2 mm; the distance s between the first surface and the second surface is in the range of 0.2mm to 1.8mm.

Further, the thickness of the top cover is larger than that of the abutting part of the stressor, the thickness of the abutting part of the stressor is larger than that of the connecting part of the stressor, and the thickness of the connecting part of the stressor is larger than that of the deformed part of the stressor.

Further, the range of the difference between the thickness d1 of the top cover and the thickness d2 of the abutting portion is as follows: d1-d2 is more than or equal to 0.05mm and less than or equal to 1.4mm.

Further, the range of the difference between the thickness d1 of the top cover and the minimum thickness d3 of the deformation portion is: d1-d3 is more than or equal to 0.8mm and less than or equal to 2.2mm.

Further, the range of the thickness d1 of the top cover is: d1 is more than or equal to 1.8mm and less than or equal to 3.6mm; range of thickness d2 of the abutting portion: d2 is more than or equal to 1.6mm and less than or equal to 3.4mm; range of thickness d3 of the deformation portion: d3 is more than or equal to 0.35mm and less than or equal to 1.0mm; the thickness d4 of the connecting part is within the range of 0.45mm to 1.5mm, wherein d4 is not less than 0.45 mm.

Further, the through hole comprises a first sub hole and a second sub hole which are communicated with each other, the first sub hole is closer to the metal pressing block than the second sub hole, the radial size of the first sub hole is larger than that of the second sub hole, the stress piece is arranged in the first sub hole, the connecting portion abuts against the bottom wall of the top cover for limiting the first sub hole and is connected with the side wall of the top cover for limiting the first sub hole.

Further, the depth of the first sub-hole ranges from 0.3mm to 1.35mm in the stacking direction of the metal compact and the top cover.

Furthermore, the supporting part protrudes out of the surface of the deformation part facing the metal pressing block; the surface of the abutting part facing the metal pressing block is a plane, and the periphery of the abutting part close to the end part of the metal pressing block is provided with an arc-shaped chamfer.

Furthermore, the abutting part is cylindrical, and the ratio of the diameter D of the abutting part to the line width L of the deformation part is more than or equal to 0.15 and less than or equal to 1.6 in the range of D/L.

Further, the range of the angle α between the central axis of the abutting portion and the deformation portion is: alpha is more than or equal to 25 degrees and less than or equal to 75 degrees.

Wherein, the stress piece is manufactured by adopting a rotary cutting processing technology or a stamping technology; the connecting part of the stress piece is connected with the top cover through laser welding.

The present application in a second aspect provides an energy storage device comprising:

the end cover assembly of the embodiment of the application further comprises a pole column, the pole column penetrates through the top cover and is arranged in an insulating manner with the top cover, and the pole column is electrically connected with the metal pressing block;

one end of the adapter sheet is electrically connected with the pole; and

and the electrode assembly comprises a tab, and the tab is electrically connected with one end of the adapter sheet far away from the pole.

A third aspect of the present application provides a powered device, comprising:

an electric equipment body; and

the energy storage device of the embodiment of the application is used for supplying power for the electric equipment.

When the end cover assembly of the embodiment of the application is subjected to the preset pressure which is larger than or equal to the preset pressure which is close to the direction of the metal pressing block, the maximum movable distance of the abutting part in the direction close to the metal pressing block is larger than the distance between the first surface and the second surface. When the metal pressing block is applied to the energy storage device, the abutting portion abuts against the metal pressing block, the energy storage device is in short circuit connection, and strong short circuit current is formed in the energy storage device, so that when the abutting portion is melted, the abutting portion can continuously move towards the direction close to the metal pressing block under the continuous pushing of the internal pressure of the energy storage device due to the fact that the movable maximum distance of the abutting portion is larger than the distance between the first surface and the second surface, the abutting portion is always abutted against the metal pressing block, the energy storage device is prevented from returning to the open circuit state again, the energy storage device is prevented from being excessively charged, the explosion condition is avoided, and the safety of the energy storage device is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural view of an end cap assembly according to an embodiment of the present application.

Fig. 2 is an exploded view of an end cap assembly according to an embodiment of the present application.

FIG. 3 isbase:Sub>A cross-sectional structural view of an end cap assembly of an embodiment of the present application taken along the line A-A in FIG. 1.

Fig. 4 is an enlarged view of a broken-line frame I in fig. 3.

FIG. 5 isbase:Sub>A cross-sectional view taken along A-A of FIG. 1 afterbase:Sub>A short circuit has occurred in an end cap assembly according to an embodiment of the present application.

Fig. 6 is an enlarged view of a dotted line frame II in fig. 5.

FIG. 7 is a schematic diagram of a stressor according to an embodiment of the present application.

Fig. 8 is a schematic structural view of a metal compact according to an embodiment of the present application.

Figure 9 is a schematic illustration of another exploded configuration of an end cap assembly according to an embodiment of the present application.

Fig. 10 is a schematic structural diagram of a pole according to an embodiment of the present application.

Fig. 11 is a schematic structural diagram of the assembled metal compact, plastic part, sealing member and post according to an embodiment of the present application.

Fig. 12 is a schematic illustration of the exploded structure of fig. 11 of the present application.

Fig. 13 isbase:Sub>A schematic cross-sectional view ofbase:Sub>A top cover of an embodiment of the present application along the directionbase:Sub>A-base:Sub>A in fig. 1.

Fig. 14 is an enlarged view of a broken-line frame III in fig. 13.

Fig. 15 is a schematic structural diagram of an energy storage device according to an embodiment of the present application.

Fig. 16 is a schematic diagram of a partial explosion structure of an energy storage device according to an embodiment of the present application.

Fig. 17 is a schematic structural diagram of an electric device according to an embodiment of the present application, in which an energy storage device is separated from an electric device body.

Description of the reference numerals:

100-end cover component, 10-top cover, 11-through hole, 13-through hole, 111-first sub hole, 113-second sub hole, 15-explosion proof hole, 31-metal pressing block, 311-first part, 313-second part, 301-first surface, 33-stress part, 331-supporting part, 302-second surface, 333-deformation part, 335-connecting part, 35-upper plastic part, 37-pole, 371-first flange part, 373-first through part, 39-sealing part, 391-second flange part, 393-second through part, 50-lower plastic part, 51-first vent hole, 53-second vent hole, 70-explosion proof component, 71-explosion proof sheet, 73-protection sheet, 200-energy storage device, 210-adapter sheet, 230-electrode component, 231-pole ear, 300-electric equipment, 310-electric equipment body.

Detailed Description

In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.

The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

It should be noted that, for convenience of description, like reference numerals denote like parts in the embodiments of the present application, and a detailed description of the like parts is omitted in different embodiments for the sake of brevity.

Referring to fig. 1 to 4, an end cap assembly 100 applied to an energy storage device (as shown in fig. 15) is provided in an embodiment of the present application, where the end cap assembly 100 includes a metal compact 31, a top cap 10, and a stressor 33. The metal compact is used for electrically connecting an electrode assembly of the energy storage device, and the metal compact 31 has a first surface 301; the top cover 10 is arranged on the first surface 301 of the metal pressing block 31 at intervals, the top cover 10 is provided with a through hole 11, and the orthographic projection of the through hole 11 on the first surface 301 falls within the range of the first surface 301; the stress piece 33 seals the through hole 11, the stress piece 33 comprises a propping part 331, a deformation part 333 and a connecting part 335 which are sequentially bent and connected, the deformation part 333 is arranged around the periphery of the propping part 331, and the connecting part 335 is arranged around the periphery of the deformation part 333; the connecting part 335 is connected with the top cover 10, and the deformation part 333 is bent from one end of the connecting part 335, which is far away from the top cover 10, to the direction far away from the metal pressing block 31; when the abutting portion 331 is subjected to a preset pressure approaching towards the metal pressing block 31, the abutting portion 331 abuts against the metal pressing block 31, and the energy storage device is in short circuit connection; the abutting portion 331 has a second surface 302 facing the metal compact 31, and when the abutting portion 331 is subjected to a predetermined pressure greater than or equal to a predetermined pressure approaching in a direction toward the metal compact 31, a maximum distance that the abutting portion 331 can move in the direction approaching the metal compact 31 is greater than a distance between the first surface 301 and the second surface 302.

The end cap assembly 100 of the embodiment of the present application may be applied to, but not limited to, an energy storage device such as a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery.

Alternatively, the metal compact 31 may be a positive electrode metal compact, and may also be a negative electrode metal compact.

Alternatively, the end cap assembly 100 may be, but is not limited to, an integrated end cap assembly 100, that is, the end cap assembly 100 with the positive metal compact and the negative metal compact both disposed on the same top cap 10.

It should be noted that the stressor 33 seals the through hole 11, and it is understood that the stressor 33 is located in the through hole 11 to close the through hole 11 and electrically connect the stressor 33 to the top cover 10.

The "preset pressure" is a pressure applied to the abutting portion 331 in the direction of the metal compact 31 when the deformation portion 333 is deformed and moves in the direction of approaching the metal compact 31; i.e. the pressure required for the stressor 33 to invert.

As shown in fig. 3 and 4, in the initial state of the end cap assembly 100, the metal compact 31 and the stressor 33 are stacked and spaced apart from each other. Top cover 10 is insulated from metal compact 31.

It is understood that the maximum distance that the abutting portion 331 can move in the direction of approaching the metal compact 31 is the maximum value of the distance that the abutting portion 331 can move in the direction of approaching the metal compact 31 when the stressor 33 is always connected to the top cover 10 when the stressor 33 is pressed on the side of the stressor 33 facing away from the metal compact 31.

Referring to fig. 5 and 6, when the end cap assembly 100 of the present application is applied to an energy storage device, and the pressure in the energy storage device is too high, and reaches the pressure at which the deformation portion 333 deforms (i.e., the abutting portion 331 receives a preset pressure approaching the metal pressing block 31 in the direction of the metal pressing block 31), under the action of the pressure in the energy storage device, the deformation portion 333 deforms, and the abutting portion 331 moves toward the direction approaching the metal pressing block 31 under the pushing action of the pressure in the energy storage device until abutting against the metal pressing block 31. Thereby make energy memory's anodal metal briquetting and the equal electricity of negative pole metal briquetting connect top cap 10, and then make anodal metal briquetting and negative pole metal briquetting short circuit connection (short for short), energy memory stops to charge or discharge to avoid the inside pressure of energy memory to continue the increase, make energy memory explode, improved the security that energy memory used.

When the end cover assembly is applied to the energy storage device and the abutting portion is subjected to preset pressure approaching towards the metal pressing block, the abutting portion abuts against the metal pressing block, and after the energy storage device is in short-circuit connection, strong short-circuit current can be formed in the energy storage device, so that the abutting portion is melted, the abutting portion and the metal pressing block are easily disconnected again, and a short circuit is formed. At this moment, the charging or discharging of the energy storage device is continued, the pressure inside the energy storage device can be increased continuously, the energy storage device is easy to explode, and the use safety of the energy storage device is reduced.

When the abutting portion 331 is subjected to a predetermined pressure greater than or equal to a predetermined pressure approaching in a direction toward the metal compact 31, a maximum movable distance of the abutting portion 331 in the direction approaching the metal compact 31 is greater than a distance between the first surface 301 and the second surface 302. When the metal pressing block 31 is applied to the energy storage device, the abutting portion 331 abuts against the metal pressing block 31, the energy storage device is in short circuit connection, and strong short circuit current is formed in the energy storage device, so that when the abutting portion 331 is melted, the abutting portion 331 can continuously move towards the direction close to the metal pressing block 31 due to the fact that the movable maximum distance of the abutting portion 331 is larger than the distance between the first surface 301 and the second surface 302 when the abutting portion 331 is continuously pushed by the internal pressure of the energy storage device, the abutting portion 331 always abuts against the metal pressing block 31, the energy storage device is prevented from returning to an open circuit state again, the energy storage device is prevented from being excessively charged, the explosion condition is avoided, and the safety of the energy storage device is improved.

In some embodiments, the range of the difference between the maximum movable distance s1 of the abutting portion 331 toward the direction of approaching the metal compact 31 and the distance s2 between the first surface 301 and the second surface 302 is: s1-s2 is more than or equal to 2.6mm and less than or equal to 3.4mm. Specifically, a difference s1-s2 between a movable maximum distance s1 of the abutting portion 331 toward a direction of approaching the metal compact 31 and a distance s2 between the first surface 301 and the second surface 302 may be, but is not limited to, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, and the like. When the difference between the maximum movable distance s1 of the abutting portion 331 in the direction approaching to the metal pressing block 31 and the distance s2 between the first surface 301 and the second surface 302 is too small, a short circuit occurs inside the energy storage device, and a strong short-circuit current is formed, so that when the abutting portion 331 is melted, the value of s1-s2 (i.e., the difference between the maximum movable distance s1 of the abutting portion 331 in the direction approaching to the metal pressing block 31 and the distance s2 between the first surface 301 and the second surface 302) cannot offset the thickness portion of the abutting portion 331 that is melted and reduced, and thus the energy storage device is easily returned to the open circuit state again, the internal pressure will continue to increase, the energy storage device is easily exploded, and the safety of the energy storage device in use is reduced. The difference between the maximum movable distance s1 of the abutting portion 331 in the direction approaching the metal pressing block 31 and the distance s2 between the first surface 301 and the second surface 302 is too large, so that the thickness of the end cover assembly 100 is increased, and when the end cover assembly is applied to an energy storage device, the energy storage device is not miniaturized, and the energy density of the energy storage device using the end cover assembly 100 is reduced. In addition, when the energy storage device is short-circuited, the travel distance of the abutting portion 331 in the direction toward the metal compact 31 is increased, and the response speed of the stressor 33 is reduced.

Optionally, the range of the movable maximum distance s1 of the abutting portion 331 toward the direction approaching the metal compact 31 is 2.8mm ≦ s1 ≦ 5.2mm. Specifically, the movable maximum distance s1 of the abutting portion 331 toward the direction approaching the metal compact 31 may be, but is not limited to, 2.8mm, 2.9mm, 3.0mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.6mm, 3.8mm, 4.0mm, 4.2mm, 4.5mm, 4.8mm, 5.0mm, 5.2mm, and the like. When the maximum movable distance s1 of the abutting portion 331 in the direction approaching to the metal pressing block 31 is too large, the thickness of the end cap assembly 100 is increased, and when the end cap assembly is applied to an energy storage device, the miniaturization of the energy storage device is not facilitated, and the energy density of the energy storage device using the end cap assembly 100 is reduced. In addition, when the energy storage device is short-circuited, the travel distance of the abutting portion 331 in the direction approaching the metal compact 31 is increased, and the response speed of the stressor 33 is reduced.

Optionally, the distance s2 between the first surface 301 and the second surface 302 is in the range of 0.2mm ≦ s2 ≦ 1.8mm. In other words, the distance s2 between the surface of the abutting portion 331 facing the metal compact 31 and the surface of the metal compact 31 facing the abutting portion 331 is in the range of 0.2mm ≦ s2 ≦ 1.8mm. Specifically, the distance s2 between the first surface 301 and the second surface 302 may be, but is not limited to, 0.2mm, 0.5mm, 0.7mm, 1.0mm, 1.2mm, 1.6mm, 1.8mm, and the like.

In this embodiment, the smaller the distance between the surface of the abutting portion 331 facing the metal compact 31 and the surface of the metal compact 31 facing the abutting portion 331 is, the easier the metal compact 31 is abutted when the stressor 33 is inverted, and the energy storage device can be short-circuited more timely. However, when the distance between the surface of the abutting portion 331 facing the metal pressing block 31 and the surface of the metal pressing block 31 facing the abutting portion 331 is too small, the gap between the abutting portion 331 and the metal pressing block 31 is smaller than the electrical safety distance, and when the energy storage device is normally used, the gap is too close to the gap, air is easily punctured, so that the energy storage assembly is short-circuited, the normal use of the energy storage assembly is affected, and the risk that the stress piece 33 fails due to mistaken touch is increased. When the distance between the surface of the abutting portion 331 facing the metal pressing block 31 and the surface of the metal pressing block 31 facing the abutting portion 331 is too large, and the stress piece 33 is turned, the distance that the abutting portion 331 needs to travel is too large, which easily causes that although the stress piece 33 is turned, the abutting portion 331 is not abutted to the metal pressing block 31, the energy storage device cannot be short-circuited in time, and the safety of the energy storage device in use is reduced; in addition, the thickness of the end cap assembly 100 is increased, reducing the energy density of an energy storage device in which the end cap assembly 100 is used.

Optionally, the thickness of the top cover 10 is greater than the thickness of the abutting portion 331 of the stressor 33, the thickness of the abutting portion 331 of the stressor 33 is greater than the thickness of the connecting portion 335 of the stressor 33, and the thickness of the connecting portion 335 of the stressor 33 is greater than the thickness of the deformed portion 333 of the stressor 33.

In the end cap assembly 100 of the present embodiment, the thickness of the top cap 10 is greater than the thickness of the abutting portion 331 of the stressor 33, the thickness of the abutting portion 331 of the stressor 33 is greater than the thickness of the connecting portion 335 of the stressor 33, and the thickness of the connecting portion 335 of the stressor 33 is greater than the thickness of the deformation portion 333 of the stressor 33, so that the deformation pressure at the deformation portion 333 of the stressor 33 is less than the deformation pressure of the top cap 10, when the end cap assembly 100 is applied to an energy storage device, and the internal pressure of the energy storage device increases to a preset pressure, the deformation portion 333 can deform in time, the stressor 33 turns over, so that the abutting portion 331 abuts against the metal pressing block 31, the metal pressing block 31 is electrically connected to the top cap 10, the energy storage device is short-circuited, and when the deformation portion 333 deforms, the top cap 10 does not deform. In addition, top cap 10 thickness is greater than stress 33, stress 33 sets up in through-hole 11 of top cap 10, when the installation, stress 33 is difficult for extrudeing, thereby avoid when end cover subassembly 100 assembles, misoperation, stress 33 is extruded, make stress 33's deformation part 333 take place deformation, support portion 331 butt metal briquetting 31, and then lead to when end cover subassembly 100 is applied to energy memory, when energy memory internal pressure has not reached preset pressure, metal briquetting 31 just has electrically connected top cap 10 and has taken place the short circuit connection, thereby influence energy memory's normal use. Moreover, the thickness of the top cover 10 is smaller than that of the abutting portion 331, so that when the stress piece 33 turns over, the abutting portion 331 does not deform, and the surface of the abutting portion 331 facing the metal pressing block 31 can fully abut against the metal pressing block 31, so that short circuit connection occurs inside the energy storage device; and when top cap 10 is too thick, can restrict the distance that supports portion 331 and move towards the direction that is close to metal briquetting 31, set up and make support portion 331 can't move to the position of contacting with metal briquetting 31 (that is stress piece 33 can't jack up to the position of contacting with metal briquetting 31), thereby can't make the internal short circuit of energy memory connect, through making the thickness of top cap 10 be less than the thickness that supports portion 331, can make when the internal pressure of energy memory increases to stress piece 33 upset required pressure, support portion 331 can move to the position of fully supporting with metal briquetting 31, thereby better, make the energy memory short circuit take place in time, improve the security that the energy memory used. The thickness of the connecting portion 335 is greater than that of the deformation portion 333, so that when the stress piece 33 deforms under pressure, the connecting portion 335 can be prevented from being damaged in the deformation process of the deformation portion 333, and the energy storage device using the end cap assembly 100 can be prevented from being damaged.

Optionally, the range of the difference between the thickness d1 of the top cover 10 and the thickness d2 of the abutting portion 331 is: d1-d2 is more than or equal to 0.05mm and less than or equal to 1.4mm. Specifically, the difference d1-d2 between the thickness d1 of the top cover 10 and the thickness d2 of the abutting portion 331 is, but not limited to, 0.05mm, 0.1mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.4m, and the like. Therefore, when the stress piece 33 is assembled on the top cover 10, the abutting part 331 and the upper and lower surfaces of the top cover 10 have a certain margin, and the stress piece 33 is prevented from being mistakenly touched to cause deformation failure when other parts of the end cover assembly 100 are assembled.

Alternatively, the range of the difference between the thickness d1 of the top cover 10 and the minimum thickness d3 of the deformation part 333 is: d1-d3 is more than or equal to 0.8mm and less than or equal to 2.2mm. Specifically, the difference d1-d3 between the thickness d1 of the top cover 10 and the minimum thickness d3 of the deformation part 333 may be, but is not limited to, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2.0mm, 2.2mm, etc. The difference between d1 and d3 is too small, the thickness of the top cover 10 is too small, the top cover 10 is easy to deform when the stress piece 33 deforms, the original shape cannot be kept, and the problem that when the internal pressure of the energy storage device is too large, the stress piece 33 does not deform and the top cover 10 deforms first, so that the stress piece 33 cannot act is avoided. When the difference between d1 and d3 is too large, the thickness of the top cover 10 is not too thick, and when the top cover 10 is too thick, the distance that the abutting portion 331 moves toward the direction close to the metal pressing block 31 is limited, so that the abutting portion 331 cannot move to the position where the abutting portion 331 contacts the metal pressing block 31, that is, the stress piece 33 cannot lift to the position where the stress piece 31 contacts, and thus the internal short circuit connection of the energy storage device cannot be achieved. When the difference between the thickness d1 of the top cover 10 and the minimum thickness d3 of the deformation portion 333 is 0.8mm to 2.2mm, the top cover 10 is not deformed when the deformation portion 333 is deformed, and the distance that the abutting portion 331 moves toward the direction close to the metal pressing block 31 is not limited.

Optionally, the thickness d1 of the top cover 10 ranges from: d1 is not less than 1.8mm and not more than 3.6mm, and specifically, the thickness of the top cover 10 may be, but not limited to, 1.8mm, 2.0mm, 2.2mm, 2.4mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, 3.6mm, etc. The thickness of the cap 10 is too thin to deform when the stressor 33 is deformed or has not yet been deformed, rendering the stressor 33 inoperable, and failing to provide a sufficient thickness to embed the stressor 33, which can lead to failure of the stressor 33 by inadvertent contact during assembly of the other components of the end cap assembly 100. When the top cover 10 is too thick, the distance that the abutting portion 331 moves toward the direction close to the metal compact 31 is limited, and the abutting portion 331 cannot move to the position where it contacts the metal compact 31, that is, the stressor 33 cannot lift up to the position where it contacts the metal compact 31, so that the internal short circuit connection of the energy storage device cannot be achieved.

Optionally, the range of the thickness d2 of the abutting portion 331 is: d2 is more than or equal to 1.6mm and less than or equal to 3.4mm; specifically, the thickness d2 of the abutting portion 331 may be, but is not limited to, 1.6mm, 1.8mm, 1.9mm, 2.0mm, 2.2mm, 2.4mm, 2.8mm, 3.0mm, 3.2mm, 3.4mm, and the like. This allows the abutting portion 331 to be better fitted between the upper and lower surfaces (i.e., the surface facing the metal compact 31 and the surface facing away from the metal compact 31) of the top cover 10.

Alternatively, the range of the thickness d3 of the deformation part 333: d3 is more than or equal to 0.35mm and less than or equal to 1.0mm; specifically, the thickness d3 of the deformation part 333 may be, but is not limited to, 0.35mm, 0.4mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.85mm, 1.0mm, etc. The deformation part 333 is too thin and deforms too early, so that the energy storage device is in short circuit and normal application of the energy storage device is affected, and the deformation part 333 is too thick and cannot deform when the pressure inside the energy storage device reaches a preset pressure, so that the energy storage device is in short circuit, and the stress piece 33 fails. When the thickness of the deformation part 333 is between 0.35mm and 1.0mm, the deformation part 333 has certain strength, and cannot deform under the condition that the internal pressure of the energy storage device is still small, and the deformation part can timely deform to abut against the metal pressing block 31 when the internal pressure of the energy storage device reaches a preset pressure, so that the energy storage device is short-circuited, and charging and discharging are stopped.

Optionally, the thickness d4 of the connecting part 335 is in a range of 0.45mm ≦ d4 ≦ 1.5mm. Specifically, the thickness d4 of the connection part 335 may be, but is not limited to, 0.45mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.5mm, etc. When the thickness of the connecting portion 335 is too small, when the stress piece 33 is deformed by pressure, the connecting portion 335 may be damaged during the deformation of the deformation portion 333, which may damage an energy storage device using the end cap assembly 100. When the thickness of the connecting portion 335 is too large, when the stress piece 33 is mounted in the through hole 11 of the top cover 10, the stress piece 33 exceeds the two opposite surfaces of the top cover 10, and the stress piece 33 is easily touched by mistake in the subsequent process of assembling other components of the end cover assembly 100, so that the pressure value of the stress piece 33 turning over is inaccurate.

Referring to fig. 7, in some embodiments, the abutting portion 331 protrudes from a surface of the deformation portion 333 facing the metal compact 31; the surface of the abutting portion 331 facing the metal pressing block 31 is a plane, and the periphery of the abutting portion 331 near the end of the metal pressing block 31 has an arc-shaped chamfer. The surface of the abutting portion 331 facing the metal pressing block 31 is a plane, so that when the internal pressure of the energy storage device is greatly preset, and the abutting portion 331 abuts against the metal pressing block 31, the contact area between the abutting portion 331 and the metal pressing block 31 is larger, thereby better realizing electrical connection and more timely short-circuiting the energy storage device. The stress piece 33 is generally formed by processes such as stamping, burrs are easily formed on the surface of the abutting portion 331, so that when the abutting portion 331 abuts against the metal pressing block 31, electrical connection cannot be well performed, and by arranging the arc-shaped chamfer on the periphery of the end portion, close to the metal pressing block 31, of the abutting portion 331, burrs on the abutting portion 331 can be better avoided, so that when the abutting portion 331 abuts against the metal pressing block 31, the metal pressing block 31 and the abutting portion 331 have better electrical connection performance.

Alternatively, the arc-shaped chamfer may be at least one of an elliptical arc-shaped chamfer, a rounded chamfer, and the like.

In some embodiments, the supporting portion 331 is cylindrical, and the ratio of the diameter D of the supporting portion 331 to the line width L of the deformation portion 333 is in the range of 0.15 ≦ D/L ≦ 1.6; specifically, the ratio of the diameter D of the abutting portion 331 to the line width L of the deformation portion 333 may be, but is not limited to, 0.15, 0.3, 0.5, 0.8, 1.0, 1.2, 1.4, 1.6, and the like.

When the ratio of the diameter D of the abutting portion 331 to the line width L of the deformation portion 333 is too small, the diameter D of the abutting portion 331 is too small, and when the abutting portion 331 abuts against the metal pressing block 31, the contact area between the abutting portion 331 and the metal pressing block 31 is not large enough, which easily causes poor contact between the abutting portion 331 and the metal pressing block 31, and thus the energy storage device cannot be connected in a short circuit; the ratio of the diameter D of the abutting portion 331 to the line width L of the deformation portion 333 is too large, and when the stress piece 33 deforms, the deformation portion 333 is too short, so that the distance of jacking the abutting portion 331 is not enough, and the abutting portion 331 and the metal pressing block 31 are easily in poor contact, and the energy storage device cannot be connected in a short circuit.

Optionally, the diameter D of the supporting part 331 ranges from 2mm < D < 8mm; specifically, the diameter D of the abutting portion 331 may be, but is not limited to, 2mm, 3mm, 4mm, 5mm, 5.5mm, 6mm, 7mm, 8mm, and the like. The diameter D of the abutting portion 331 is too small, and when the abutting portion 331 abuts against the metal pressing block 31, the contact area between the abutting portion 331 and the metal pressing block 31 is not large enough, which easily causes the contact failure between the abutting portion 331 and the metal pressing block 31, and the energy storage device cannot be connected in a short circuit; the diameter D of the abutting portion 331 is too large, so that the space of the deformation portion 333 is reduced, and when the stress piece 33 deforms, the deformation portion 333 is too short, so that the jacking distance of the abutting portion 331 is not enough, and the abutting portion 331 and the metal pressing block 31 are easily in poor contact, so that the energy storage device cannot be connected in a short circuit.

Alternatively, the line width L of the deformed portion 333 is in the range of 9mm L20 mm. In other words, the range of the radial width of the deformed portion 333 is 9mm L20 mm. Specifically, the line width L of the deformed portion 333 may be, but is not limited to, 9mm, 11mm, 13mm, 15mm, 17mm, 19mm, 20mm, or the like. The radial width of the deformation part 333 is too short, so that when the stress piece 33 deforms, the jacking distance of the abutting part 331 is not enough, which easily causes poor contact between the abutting part 331 and the metal pressing block 31, and the energy storage device cannot be in short circuit connection; the radial width of the deformation portion 333 is too large, which reduces the diameter D of the abutting portion 331, and when the abutting portion 331 abuts against the metal pressing block 31, the contact area between the abutting portion 331 and the metal pressing block 31 is not large enough, which may cause poor contact between the abutting portion 331 and the metal pressing block 31, and thus the energy storage device cannot be connected in a short circuit.

Referring to fig. 4 again, optionally, an angle α between the central axis of the abutting portion 331 and the deformation portion 333 ranges from: alpha is more than or equal to 25 degrees and less than or equal to 75 degrees. It can be understood that, in the initial state, the abutting portion 331 extends along the stacking direction of the metal pressing block 31 and the top cover 10, and the central axis of the abutting portion 331 is perpendicular to the top cover 10. Specifically, the angle α between the central axis of the abutting portion 331 and the deformation portion 333 may be, but is not limited to, 25 °,30 °,35 °, 40 °, 45 °,50 °, 55 °, 60 °, 65 °,70 °, 75 °, and the like. The smaller the angle between the central axis of the abutting portion 331 and the deformation portion 333 is, the larger the distance that the abutting portion 331 moves toward the direction close to the metal pressing block 31 when the stress piece 33 is turned over is, but when the angle between the central axis of the abutting portion 331 and the deformation portion 333 is too small, the thickness of the abutting portion 331 in the laminating direction of the metal pressing block 31 and the smooth aluminum plate is increased, which is not favorable for thinning the end cover assembly 100, and in addition, the distance that the abutting portion 331 needs to move when the stress piece 33 is turned over is greatly increased, which increases the turning time of the stress piece 33, and is not favorable for short-circuiting the energy storage device. When the angle between the central axis of the abutting portion 331 and the deformation portion 333 is too large, the maximum distance that the abutting portion 331 can move towards the direction close to the metal pressing block 31 is limited, so that when the stress piece 33 is turned over, the moving distance of the abutting portion 331 is insufficient, the metal pressing block 31 cannot be well abutted, the electrical connection between the metal pressing block 31 and the stress piece 33 is affected, the energy storage device cannot be timely short-circuited, and the potential safety hazard of the energy storage device in use is improved. When the angle between the central axis of the abutting portion 331 and the deformation portion 333 is 30 ° to 85 °, the abutting portion 331 has the maximum distance that can move most, and the distance that the abutting portion 331 needs to move when the stress piece 33 is turned over can be reduced, so that the energy storage device can be short-circuited in time, and the safety performance of the energy storage device can be improved.

Referring to fig. 8, in some embodiments, the metal pressing block 31 includes a first portion 311 and a second portion 313 connected to each other, and the first portion 311 is configured to abut against the abutting portion 331 when the abutting portion 331 moves toward and close to the metal pressing block 31, so that the metal pressing block 31 is electrically connected to the top cover 10; the second portion 313 is used for electrically connecting an external electric device.

It is understood that the orthographic projection of the abutting portion 331 on the surface of the first portion 311 facing the stressor 33 falls within the range of the surface of the first portion 311 facing the stressor 33. The second portion 313 is provided to be offset from the stressor 33.

Alternatively, metal compact 31 may be, but is not limited to, aluminum or the like.

Referring to fig. 1, 2 and 9, in some embodiments, the end cap assembly 100 of the present application further includes a plastic piece 35 and a pole 37. The upper plastic part 35 is at least partially located between the metal pressing block 31 and the top cover 10, and is used for insulating the metal pressing block 31 from the top cover 10. The upper plastic part 35 is sleeved on the metal pressing block 31, the surface of the first portion 311 facing the stress part 33 is exposed on the upper plastic part 35, and the surface of the second portion 313 departing from the top cover 10 is exposed on the upper plastic part 35. The pole 37 penetrates through the top cover 10 and the upper plastic part 35 and is electrically connected with the second part 313 of the metal pressing block 31, the pole 37 deviates from one end of the metal pressing block 31 and is used for electrically connecting with an electrode assembly of an energy storage device, and the pole 37 and the top cover 10 are arranged in an insulating mode.

It should be noted that the upper plastic part 35 is sleeved on the metal pressing block 31, a surface of the first portion 311 facing the stressor 33 is exposed on the upper plastic part 35, and a surface of the second portion 313 facing away from the top cover 10 is exposed on the upper plastic part 35. In other words, the surface of the first portion 311 away from the stressor member 33 is wrapped by the upper plastic part 35, and the surface of the second portion 313 facing the top cover 10 is provided with the upper plastic part 35, so that the upper plastic part 35 can protect the first portion 311, and prevent the first portion 311 from being deformed in a direction approaching the stressor member 33 after being impacted, and abutting against the abutting portion 331.

Referring to fig. 10, optionally, the pole 37 includes a first flange portion 371 and a first penetrating portion 373 connected to each other, the first flange portion 371 is located on a side of the top cover 10 away from the metal pressing block 31, and the first penetrating portion 373 sequentially penetrates through the top cover 10, the upper plastic part 35, and the second portion 313 of the metal pressing block 31, and is connected to the second portion 313 (for example, welded).

Referring to fig. 11 and 12, in some embodiments, the end cap assembly 100 of the embodiment of the present application further includes a sealing member 39, the sealing member 39 is sleeved on the outer periphery of the first penetrating portion 373 for insulating the pole 37 from the top cap 10, and the sealing member 39 is further used for sealing a gap between the first penetrating portion 373 and the top cap 10 to improve the air tightness of the top cap 10.

Optionally, the sealing element 39 includes a second flange portion 391 and a second penetrating portion 393 connected to each other, the second flange portion 391 is located between the first flange portion 371 and the top cover 10, the second penetrating portion 393 penetrates through the top cover 10, and the second flange portion 391 and the second penetrating portion 393 are both sleeved on the periphery of the first penetrating portion 373 of the pole 37, so that the pole and the top cover 10 are arranged in an insulating manner.

Alternatively, the top cover 10 may be, but is not limited to, an aluminum plate or the like.

Referring to fig. 13 and 14, in some embodiments, the through hole 11 includes a first sub hole 111 and a second sub hole 113 that are connected, the first sub hole 111 is closer to the metal compact 31 than the second sub hole 113, a radial dimension of the first sub hole 111 is larger than a radial dimension of the second sub hole 113, the stressor 33 is disposed in the first sub hole 111, and the connecting portion 335 abuts against a bottom wall of the top cover 10 that defines the first sub hole 111 and connects to a side wall of the top cover 10 that defines the first sub hole 111. It can be understood that the first sub-hole 111 and the second sub-hole 113 are arranged along the arrangement direction of the metal pressing block 31 and the top cover 10, the first sub-hole 111 penetrates through the surface of the top cover 10 facing the metal pressing block 31, the second sub-hole 113 penetrates through the surface of the top cover 10 away from the metal pressing block 31, the first sub-hole 111 and the second sub-hole 113 form a step hole, and the stressor 33 is disposed in the first sub-hole 111, so that the stressor 33 is better prevented from being squeezed to the stressor 33 when the end cover assembly 100 is assembled, so that the stressor 33 is deformed and turned over in advance, and the performance of an energy storage device using the end cover assembly 100 is affected. In addition, stress piece 33 is arranged in first sub-hole 111, namely, the position of through hole 11 close to metal pressing block 31, so that the moving distance of abutting part 331 during deformation and turnover of stress piece 33 can be reduced, and after the internal pressure of the energy storage device is increased to a certain degree, stress piece 33 can be turned over more timely in a shorter time, so that abutting part 331 abuts against metal pressing block 31, and therefore the energy storage device can be short-circuited more timely, and the use safety of the energy storage device is improved.

Alternatively, the depth of the first sub-hole 111 in the stacking direction of the metal compact 31 and the top cover 10 ranges from 0.3mm to 1.35mm. Specifically, the depth of the first sub-hole 111 may be, but is not limited to, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.35mm, and the like. The depth of the first sub-hole 111 is too shallow, and after the connecting portion 335 is welded to the top cover 10, it cannot be guaranteed that the surface of the connecting portion 335 facing the metal pressing block 31 is lower than (i.e. recessed) the surface of the top cover 10 facing the metal pressing block 31; if the depth of the first sub-hole 111 is too deep, the surface of the connecting portion 335 away from the metal compact 31 will be lower than (i.e. protruded from)) the surface of the top cover 10 away from the metal compact 31, which is likely to cause the stress member 33 to be touched by mistake during assembling other components of the end cover assembly 100, resulting in deformation failure thereof.

In some embodiments, the top cover 10 further has a through hole 13, the through hole 13 is spaced apart from and disposed adjacent to the through hole 11, and the through hole 13 is used for disposing the first through portion 373 of the pole 37 and the second through portion 393 of the sealing member 39.

Optionally, the top cover 10 is a long strip-shaped plate-shaped structure, that is, the top cover 10 has long sides and short sides, the through holes 13 and the through holes 11 are arranged at intervals along the long side direction of the top cover 10, and the through holes 13 are arranged closer to the end of the top cover 10 than the through holes 11.

Optionally, the stressor 33 is made by a rotary cutting process or a stamping process; the connecting part 335 of the stressor 33 and the top cover 10 are connected by laser welding. This improves the hermeticity of the connection between the stressor 33 and the header 10 and better seals the energy storage device in which the end cap assembly 100 is used.

Referring to fig. 2, 3 and 9 again, in some embodiments, the end cap assembly 100 of the embodiment of the present application further includes a lower plastic part 50, where the lower plastic part 50 is disposed on a side of the top cap 10 away from the metal pressing block 31, and when the end cap assembly is applied to an energy storage device, the lower plastic part 50 is closer to an electrode assembly of the energy storage device than the top cap 10, and is used for insulating the top cap 10 from the electrode assembly of the energy storage device.

It should be noted that, in this embodiment, the first flange portion 371 of the pole 37 is disposed on a side of the lower plastic part 50 departing from the top cover 10, and the first penetrating portion 373 penetrates the sealing member 39, the lower plastic part 50, the top cover 10, the upper plastic part 35 and the metal pressing block 31 from a side of the sealing member 39 departing from the lower plastic part 50 in sequence, and is welded to the metal pressing block 31. It will be appreciated that pole 37 is electrically connected to metal compact 31, but is insulated from top cover 10 and stressor 33.

Optionally, the lower plastic part 50 has a first vent hole 51 at a position overlapping with the stressor 33, and the first vent hole 51 is used for communicating the stressor 33 with an air passage of an electrode assembly of the energy storage device, so that when the pressure inside the energy storage device increases, the pressure can be transmitted to the stressor 33 in time.

Referring to fig. 1 and fig. 2 again, in some embodiments, the top cover 10 further has an explosion-proof hole 15, and the explosion-proof hole 15 is disposed on a side of the through hole 11 away from the through hole 13; the end cover assembly 100 of the embodiment of the application further includes an explosion-proof assembly 70, where the explosion-proof assembly 70 is used for sealing the explosion-proof hole 15, so that when the pressure inside the energy storage device reaches the explosion pressure of the explosion-proof assembly 70, the energy storage device is exploded to release pressure; the position where the lower plastic part 50 is overlapped with the explosion-proof assembly 70 is provided with a second vent hole 53 so as to communicate with the air passage between the explosion-proof assembly 70 and the energy storage device.

It can be understood that, when the pressure inside the energy storage device reaches the pressure at which the stress piece 33 turns over, the stress piece 33 will turn over first, so that the inside of the energy storage device is short-circuited, and charging and discharging are stopped, thereby preventing the pressure inside the energy storage device from increasing continuously. However, if the stress piece 33 is turned over, the energy storage device cannot be short-circuited or the energy storage device is short-circuited, but the internal pressure of the energy storage device is still continuously increased, when the internal pressure of the energy storage device increases the explosion pressure of the explosion-proof assembly 70, the explosion-proof assembly 70 explodes, so that the energy storage device is decompressed, the released energy is controlled within a safety range, a double-safety function is realized, and the use safety of the energy storage device is improved.

Optionally, the explosion-proof assembly 70 (or the explosion-proof hole 15) is arranged in the middle of the top cover 10, the air pressure of the energy storage device corresponding to the middle is the largest, the explosion-proof assembly 70 is arranged in the middle of the top cover 10, and when the internal pressure of the energy storage device reaches the preset explosion pressure, the explosion can be carried out in time so as to relieve the pressure of the energy storage device.

Optionally, the explosion-proof assembly 70 includes an explosion-proof sheet 71 and a protection sheet 73, the explosion-proof sheet 71 is disposed at one side of the explosion-proof hole 15 close to the lower plastic and welded to the top cover 10, and the explosion-proof sheet 71 has a notch to rupture after the internal pressure of the energy storage device increases to a certain value, so as to perform explosion. The protection sheet 73 is disposed on a surface of the top cover 10 away from the lower plastic part 50, and is used for sealing the explosion-proof hole 15 to prevent a foreign object from striking the explosion-proof sheet 71 to damage the explosion-proof sheet 71, so that the electrolyte inside the energy storage device overflows, and the like.

Referring to fig. 15 and 16, an embodiment of the present application further provides an energy storage device 200, which includes: end cap assembly 100, interposer 210, and electrode assembly 230 of embodiments of the present application. The adapter sheet 210 is arranged on one side of the top cover 10 away from the metal pressing block 31, and is partially stacked with the first flange part 371 of the terminal post 37, and one end of the adapter sheet 210 is electrically connected with the terminal post 37 of the end cover assembly 100; the electrode assembly 230 is disposed on a side of the interposer 210 facing away from the end cap assembly 100, the electrode assembly 230 includes a tab 231, and the tab 231 is electrically connected to an end of the interposer 210 far away from the terminal 37.

The adaptor sheet 210 is disposed on a side of the top cover 10 departing from the metal pressing block 31, and specifically, the adaptor sheet 210 is disposed on a side of the lower plastic part 50 departing from the top cover 10. It is understood that the interposer 210 is stacked on the surface of the lower plastic part 50 facing away from the top cover 10, and one end of the surface of the interposer 210 facing the lower plastic part 50 near the first flange 371 of the pole 37 is electrically connected (e.g., welded) to the first flange 371. The end of the interposer 210 facing away from the surface of the lower plastic member 50 and away from the electrode post 37 is electrically connected (e.g., welded) to the tab 231 of the electrode assembly 230.

The energy storage device 200 according to the embodiment of the present disclosure may be, but is not limited to, a lithium ion secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or the like.

It can be understood that, when the metal compact 31 of the end cap assembly 100 is a positive electrode metal compact, the terminal 37 is a positive electrode terminal, the adaptor sheet 210 is a positive electrode adaptor sheet, and the tab 231 is a positive electrode tab; when the metal compact 31 of the end cap assembly 100 is a negative electrode metal compact, the electrode post 37 is a negative electrode post, the adapter sheet 210 is a negative electrode adapter sheet, and the tab 231 is a negative electrode tab.

For a detailed description of the end cap assembly 100, please refer to the description of the corresponding parts of the above embodiments, which is not repeated herein.

Optionally, the electrode assembly 230 further includes an electrode tab (not shown) including a current collector and an electrode active layer disposed on the surface of the current collector, the electrode tab being electrically connected to the tab 231. It can be understood that the electrode plate may be a positive electrode plate, and may also be a negative electrode plate.

Referring to fig. 17, an embodiment of the present application further provides an electric device 300, which includes: the energy storage device 200 is used for supplying power to the electric equipment 300, and the electric equipment body 310 is provided with the energy storage device 200 according to the embodiment of the application.

The electric device 300 according to the embodiment of the present application may be, but is not limited to, a portable electronic device such as a mobile phone, a tablet computer, a notebook computer, a desktop computer, a smart band, a smart watch, an electronic reader, and a game machine. And can also be vehicles such as automobiles, trucks, saloon cars, vans, motor cars, high-speed rails, electric bicycles, and the like. In addition, various household appliances and the like can be used.

It should be understood that the powered device 300 described in this embodiment is only one form of the powered device 300 to which the end cap assembly 100 is applied, and should not be construed as limiting the powered device 300 provided in this application, nor should it be construed as limiting the end cap assembly 100 provided in various embodiments of this application.

Reference in the specification to "an embodiment" or "an implementation" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by a person skilled in the art that the embodiments described herein can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the embodiments of the present application may be combined arbitrarily without contradiction between them to form another embodiment without departing from the spirit and scope of the technical solution of the present application.

Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present application and not for limiting, and although the present application is described in detail with reference to the above preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present application can be modified or substituted by equivalents without departing from the spirit and scope of the technical solutions of the present application.

Claims

1. An end cap assembly (100) for an energy storage device, the energy storage device including an electrode assembly, comprising:

a metal compact (31) for electrically connecting an electrode assembly of the energy storage device, the metal compact (31) having a first surface (301);

the top cover (10) is arranged on the first surface (301) of the metal pressing block (31) at intervals, the top cover (10) is provided with a through hole (11), and the orthographic projection of the through hole (11) on the first surface (301) falls into the range of the first surface (301); and

the stress piece (33) is used for sealing the through hole (11), the stress piece (33) comprises a propping part (331), a deformation part (333) and a connecting part (335) which are sequentially bent and connected, the deformation part (333) is arranged around the periphery of the propping part (331), and the connecting part (335) is arranged around the periphery of the deformation part (333); the connecting part (335) is connected with the top cover (10), and the deformation part (333) is bent from one end of the connecting part (335) departing from the top cover (10) to the direction departing from the metal pressing block (31); when the abutting part (331) is subjected to a preset pressure approaching towards the direction of the metal pressing block (31), the abutting part (331) abuts against the metal pressing block (31), and the energy storage device is in short circuit connection;

the abutting portion (331) has a second surface (302) facing the metal compact (31), and when the abutting portion (331) is subjected to a preset pressure greater than or equal to a direction approaching toward the metal compact (31), a maximum distance that the abutting portion (331) can move in the direction approaching toward the metal compact (31) is greater than a distance between the first surface (301) and the second surface (302).

2. The end cap assembly (100) of claim 1, wherein a difference between a maximum movable distance s1 of the retaining portion (331) toward a direction of approaching the metal compact (31) and a distance s2 between the first surface (301) and the second surface (302) ranges from: s1-s2 is more than or equal to 2.6mm and less than or equal to 3.4mm.

3. The end cap assembly (100) of claim 2, wherein a movable maximum distance s1 of the retaining portion (331) towards a direction of approaching the metal compact (31) ranges from 2.8mm ≦ s1 ≦ 5.2mm; the distance s2 between the first surface (301) and the second surface (302) is in the range of 0.2mm ≤ s2 ≤ 1.8mm.

4. The end cap assembly (100) of claim 1, wherein the thickness of the top cap (10) is greater than the thickness of the abutting portion (331) of the stressor (33), the thickness of the abutting portion (331) of the stressor (33) is greater than the thickness of the connecting portion (335) of the stressor (33), and the thickness of the connecting portion (335) of the stressor (33) is greater than the thickness of the deformed portion (333) of the stressor (33).

5. The end cap assembly (100) of claim 4, wherein the thickness d1 of the top cap (10) and the thickness d2 of the retaining portion (331) are within a range of: d1-d2 is more than or equal to 0.05mm and less than or equal to 1.4mm.

6. The end cap assembly (100) of claim 4, wherein the thickness d1 of the top cap (10) differs from the minimum thickness d3 of the deformation (333) by a range of: d1-d3 is more than or equal to 0.8mm and less than or equal to 2.2mm.

7. The end cap assembly (100) of claim 4, wherein the thickness d1 of the top cap (10) is in the range of: d1 is more than or equal to 1.8mm and less than or equal to 3.6mm; range of thickness d2 of the abutting portion (331): d2 is more than or equal to 1.6mm and less than or equal to 3.4mm; range of thickness d3 of the deformation portion (333): d3 is more than or equal to 0.35mm and less than or equal to 1.0mm; the thickness d4 of the connecting part (335) is within the range of 0.45 mm-1.5 mm.

8. The end cap assembly (100) of claim 1, wherein the through hole (11) comprises a first sub hole (111) and a second sub hole (113) in communication, the first sub hole (111) being closer to the metal compact (31) than the second sub hole (113), a radial dimension of the first sub hole (111) being greater than a radial dimension of the second sub hole (113), the stressor (33) being disposed within the first sub hole (111), the connecting portion (335) abutting a bottom wall of the top cap (10) defining the first sub hole (111) and connecting the top cap (10) defining a side wall of the first sub hole (111).

9. The end cap assembly (100) of claim 8, wherein the first sub-aperture (111) has a depth in a range of 0.3mm to 1.35mm in a stacking direction of the metal compact (31) and the top cap (10).

10. The end cap assembly (100) according to any one of claims 1 to 9, wherein the retaining portion (331) protrudes from a surface of the deformation portion (333) facing the metal compact (31); the surface of the abutting part (331) facing the metal pressing block (31) is a plane, and the periphery of the abutting part (331) close to the end part of the metal pressing block (31) is provided with an arc chamfer.

11. The end cap assembly (100) of any one of claims 1-9, wherein the retaining portion (331) is cylindrical, and a ratio of a diameter D of the retaining portion (331) to a line width L of the deformation portion (333) is in a range of 0.15 ≦ D/L ≦ 1.6.

12. The end cap assembly (100) of claim 10, wherein an angle a between a central axis of the retaining portion (331) and the deformation portion (333) ranges from: alpha is more than or equal to 25 degrees and less than or equal to 75 degrees.

13. The end cap assembly (100) of any of claims 1-9, wherein the stressor member (33) is formed using a rotary-cut process or a stamping process; the connecting part (335) of the stress piece (33) and the top cover (10) are fixed through welding.

14. An energy storage device (200), comprising:

the end cap assembly (100) of any one of claims 1 to 13, wherein the end cap assembly (100) further comprises a pole (37), the pole (37) is arranged through the top cap (10) and the metal compact (31), and the pole (37) is insulated from the top cap (10) and electrically connected with the metal compact (31);

the adapter sheet (210) is arranged on one side, away from the metal pressing block (31), of the top cover (10), and one end of the adapter sheet (210) is electrically connected with the pole (37); and

the electrode assembly (230) is arranged on one side, away from the end cover assembly (100), of the adapter sheet (210), the electrode assembly (230) comprises a tab (231), and the tab (231) is electrically connected with one end, away from the pole (37), of the adapter sheet (210).

15. A powered device (300), comprising:

an electric equipment body (310); and

the energy storage device (200) of claim 14, the energy storage device (200) being configured to power the powered device (300).