CN213340640U

CN213340640U - End cover assembly, battery monomer, battery and power consumption device

Info

Publication number: CN213340640U
Application number: CN202022570000.9U
Authority: CN
Inventors: 肖海河; 张小文
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-11-09
Filing date: 2020-11-09
Publication date: 2021-06-01
Anticipated expiration: 2030-11-09

Abstract

The application relates to an end cover assembly, a battery monomer, a battery and an electric device. The end cap assembly is used for a battery cell. The end cap assembly includes: an end cap having a mounting hole; the pressure relief mechanism is used for actuating to relieve pressure when the internal pressure or temperature of the battery cell reaches a threshold value; pressure release mechanism covers the mounting hole, and pressure release mechanism includes first nick and second nick, and first nick sets up in pressure release mechanism's central area, and the second nick links to each other with first nick, and the extending direction of first nick and second nick is the same, and the second nick extends from the edge of the one end orientation pressure release mechanism of first nick, and the fracture stress who corresponds part with first nick in the pressure release mechanism is less than the fracture stress who corresponds part with the second nick in the pressure release mechanism. The end cover assembly of the embodiment of the application aims at solving the technical problem that an accidental blasting pressure relief mechanism has.

Description

End cover assembly, battery monomer, battery and power consumption device

Technical Field

The application relates to the technical field of batteries, in particular to an end cover assembly, a battery monomer, a battery and an electric device.

Background

With the development of society and scientific technology, batteries are widely used to power high-power devices, such as electric vehicles, etc. The battery includes a plurality of battery cells connected in series or parallel to achieve a larger capacity or power. The battery cell includes a case, an electrode assembly, an end cap, and a pressure relief mechanism. In the single use of battery, there is the condition of unexpected blasting pressure release in pressure release mechanism, influences single life and the safety in utilization of battery.

SUMMERY OF THE UTILITY MODEL

The application provides an end cover subassembly, battery monomer, battery and power consumption device, aims at solving the technical problem that there is unexpected blasting pressure release in pressure release mechanism.

In one aspect, the present application provides an end cap assembly for a battery cell, the end cap assembly comprising:

an end cap having a mounting hole; the pressure relief mechanism is used for actuating to relieve pressure when the internal pressure or temperature of the battery cell reaches a threshold value; pressure release mechanism covers the mounting hole, and pressure release mechanism includes first nick and second nick, and first nick sets up in pressure release mechanism's central area, and the second nick links to each other with first nick, and the extending direction of first nick and second nick is the same, and the second nick extends from the edge of the one end orientation pressure release mechanism of first nick, and the fracture stress who corresponds part with first nick in the pressure release mechanism is less than the fracture stress who corresponds part with the second nick in the pressure release mechanism.

The end cover assembly according to the embodiment of the application is applied to a battery cell. The end cap assembly includes an end cap and a pressure relief mechanism. The pressure relief mechanism is used for actuating when the internal pressure or the temperature of the battery cell reaches a threshold value so as to relieve the internal pressure of the battery cell. When the internal pressure or the temperature of the battery cell reaches a threshold value, the part, corresponding to the first notch, of the pressure relief mechanism is broken first, and then the crack is expanded to the part, corresponding to the second notch, of the pressure relief mechanism along the extending direction of the first notch, so that the part, corresponding to the second notch, of the pressure relief mechanism can be broken. Because first nick sets up in the central zone of pressure release mechanism, consequently in battery monomer normal use process, when internal pressure or temperature appear undulant condition, the stress size fluctuation that bears with first nick corresponding part on the pressure release mechanism is less to the fatigue ageing condition is difficult to appear, reduces the pressure release mechanism and takes place the possibility that the unexpected blasting pressure release condition that does not reach the threshold value.

According to one embodiment of the present application, the pressure relief mechanism includes an outer surface facing away from an interior of the battery cell, the outer surface having the first score and the second score disposed thereon.

According to one embodiment of the present application, the second score extends to an edge of the pressure relief mechanism.

The second nick extends through pressure relief mechanism to when pressure relief mechanism took place to explode, the crack can expand to pressure relief mechanism's edge along the second nick, makes the bigger that pressure relief mechanism blasting opening can be opened, and the area that the blasting was opened is more sufficient, accomplishes the pressure relief with rapider.

According to one embodiment of the present application, the second score is spaced a predetermined distance from an edge of the pressure relief mechanism.

The second nick does not penetrate through the edge of the pressure relief mechanism, so that the second nick keeps a preset distance from the edge of the pressure relief mechanism, and the possibility that the second nick has adverse effects on the joint of the edge of the pressure relief mechanism and the end cover can be reduced.

According to one embodiment of the application, the first score is provided with second scores along two opposite sides of the extending direction of the first score.

After the part corresponding to the first nick on the pressure relief mechanism is broken, the crack can be expanded to the second nick areas on two sides, so that the explosion opening of the pressure relief mechanism can be opened more, the explosion opening area is more sufficient, and the pressure relief can be completed more quickly.

According to an embodiment of the present application, the number of the first scores is two or more, and the two or more first scores are arranged to intersect.

Set up two or more first nicks, the part can fracture simultaneously with first nick correspondence on the pressure release mechanism, is favorable to improving blasting speed and pressure release efficiency.

According to one embodiment of the present application, the intersection of the two or more first scores is located at the center of the pressure relief mechanism.

According to one embodiment of the application, a part of the pressure relief mechanism is bulged along the thickness direction of the pressure relief mechanism to form a reinforcing part, and the first score and the second score are arranged on the concave surface of the reinforcing part.

One part of the pressure relief mechanism is bulged along the thickness direction of the pressure relief mechanism to form a reinforcing part, so that the mechanical rigidity of the pressure relief mechanism is improved, and the possibility of accidental breakage of the part, corresponding to the first nick and/or the second nick, on the pressure relief mechanism caused by bending of the pressure relief mechanism in the transportation process or the production process is reduced.

According to one embodiment of the present application, the pressure relief mechanism has a predetermined length and width, the first score extends in the length direction, the first score has a dimension in the length direction that is less than 1/2 of the length; alternatively, the first score extends in a width direction, the first score having a dimension in the width direction that is less than 1/2 of the width.

The size of the first nick is limited, the whole mechanical strength of the pressure relief mechanism can be guaranteed to meet the use requirement, and the possibility that the whole mechanical strength of the pressure relief mechanism is influenced due to the fact that the size of the first nick is too large is reduced.

According to one embodiment of the present application, a thickness of a portion of the pressure relief mechanism corresponding to the first score is less than a thickness of a portion of the pressure relief mechanism corresponding to the second score.

According to one embodiment of the present application, the pressure relief mechanism is an isopachous sheet, and the depth of the first score is greater than the depth of the second score.

According to an embodiment of the present application, the number of the first scores is two or more, the two or more first scores are arranged at intervals, and the second score is connected to the outermost first score.

According to one embodiment of the present application, the opening width of the first score is greater than the opening width of the second score.

According to one embodiment of the present application, the first score and the second score each extend along a straight line.

The crack generated by the explosion of the pressure relief mechanism can be expanded along the linear direction, which is beneficial to improving the expansion speed of the crack.

In another aspect, the present application provides a battery cell, comprising:

a housing having an opening;

an electrode assembly housed in the case;

as for the end cap assembly of the above embodiment, the end cap is connected to the housing and covers the opening, and the portion of the pressure relief mechanism corresponding to the first notch and the portion of the pressure relief mechanism corresponding to the second notch are configured to break when the internal pressure or temperature of the battery cell reaches a threshold value, so as to release the pressure.

In another aspect, the present application provides a battery including the battery cell according to the above embodiment.

In yet another aspect, the present application provides an electric device including a battery as in the above embodiments, the battery being used to provide electric energy.

Drawings

Features, advantages and technical effects of exemplary embodiments of the present application will be described below by referring to the accompanying drawings.

FIG. 1 is a schematic structural diagram of a vehicle according to an embodiment of the present application;

fig. 2 is an exploded structural view of a battery pack according to an embodiment of the present application;

fig. 3 is a schematic partial structure diagram of a battery module according to an embodiment of the present disclosure;

fig. 4 is an exploded view of a battery cell according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of a pressure relief mechanism according to an embodiment of the present application;

FIG. 6 is a schematic cross-sectional view taken along A-A of FIG. 5;

FIG. 7 is an enlarged view at C of FIG. 6;

FIG. 8 is a schematic cross-sectional view of a pressure relief mechanism according to another embodiment of the present application;

FIG. 9 is an enlarged view at B in FIG. 5;

FIG. 10 is a schematic illustration of a pressure relief mechanism according to another embodiment of the present application;

FIG. 11 is an enlarged view at D of FIG. 10;

fig. 12 is a partial schematic structural view of a pressure relief mechanism according to still another embodiment of the present application.

In the drawings, the drawings are not necessarily drawn to scale.

Description of the labeling:

1. a vehicle; 1a, a motor; 1b, a controller;

10. a battery; 11. a first housing; 12. a second housing;

20. a battery module;

30. a battery cell;

31. a housing; 311. an opening;

32. an electrode assembly;

33. an end cap; 33a, mounting holes;

34. an electrode terminal;

35. an adapter component;

36. a pressure relief mechanism; 36a, an outer surface; 36b, an inner surface; 36c, edges; 36d, a reinforcement; 361. a first score; 362. a second score;

x, thickness direction; y, width direction; z, length direction.

Detailed Description

Embodiments of the present application will be described in further detail below with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the application and are not intended to limit the scope of the application, i.e., the application is not limited to the described embodiments.

In the description of the present application, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, indicate an orientation or positional relationship that is merely for convenience in describing the application and to simplify the description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "vertical" is not strictly vertical, but is within the tolerance of the error. "parallel" is not strictly parallel but within the tolerance of the error.

Reference in the specification to "an embodiment" 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 one skilled in the art that the embodiments described herein can be combined with other embodiments.

The following description is given with the directional terms as they are used in the drawings and not intended to limit the specific structure of the present application. In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood as appropriate by one of ordinary skill in the art.

The applicant has analyzed and studied the cells after finding that the pressure relief mechanism has been accidentally burst to relieve pressure. The applicant has found that during use of the battery cell, there is a fluctuating change in internal pressure. The pressure relief mechanism has a score located at an edge location. When the internal pressure of the battery cell becomes large, the area corresponding to the notch on the pressure relief mechanism moves toward the outside of the battery cell, and when the internal pressure of the battery cell becomes small, the area corresponding to the notch moves toward the inside of the battery cell. Because the nick is close to the edge of pressure relief mechanism, consequently the stress size fluctuation that the region that corresponds with the nick bore is great to pressure relief mechanism so repetitive motion can lead to the fatigue ageing condition to appear easily in the region that corresponds with the nick, makes the stress value that the region that corresponds with the nick can bear be less than predetermined stress value, the condition of unexpected blasting pressure relief appears easily.

Based on the above problems discovered by the applicant, the applicant improves the structure of the battery cell, and the following further describes the embodiments of the present application.

For a better understanding of the present application, embodiments of the present application are described below with reference to fig. 1 to 12.

The present embodiment provides an electric device using a battery 10 as a power source. The electric device can be, but is not limited to, a vehicle, a ship, an aircraft or the like. Referring to fig. 1, one embodiment of the present application provides a vehicle 1. The vehicle 1 may be a fuel automobile, a gas automobile, or a new energy automobile. The new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like. In an embodiment of the present application, the vehicle 1 may include a motor 1a, a controller 1b, and a battery 10. The controller 1b is used to control the battery 10 to supply power to the motor 1 a. The motor 1a is connected to wheels through a transmission mechanism, thereby driving the vehicle 1 to travel. The battery 10 may serve as a driving power source for the vehicle 1, instead of or in part in place of fuel or natural gas to provide driving power for the vehicle 1. In one example, the battery 10 may be provided at the bottom, head or tail of the vehicle 1. The battery 10 may be used to power the vehicle 1. In one example, the battery 10 may be used as an operating power source of the vehicle 1 for a circuit system of the vehicle 1. For example, the battery 10 may be used for operational power requirements during start-up, navigation and operation of the vehicle 1.

Referring to fig. 2, the battery 10 may include more than two battery modules 20. In some embodiments, battery 10 also includes a case. The battery module 20 is disposed in the case. Two or more battery modules 20 are arranged in a row in the case. The type of the case is not limited. The box body can be a frame-shaped box body, a disc-shaped box body or a box-shaped box body and the like. Illustratively, the case includes a first housing 11 for accommodating the battery module 20 and a second housing 12 covering the first housing 11. The first case 11 and the second case 12 are closed to form a receiving portion for receiving the battery module 20.

To meet different usage power requirements, the battery module 20 may include one or more battery cells 30. Referring to fig. 3, a plurality of battery cells 30 may be connected in series, in parallel, or in series-parallel to form a battery module, and a plurality of battery modules 20 may be connected in series, in parallel, or in series-parallel to form a battery. Parallel-series refers to a mixture of series and parallel. For example, the battery may include a plurality of battery cells 30, wherein the plurality of battery cells 30 may be connected in series, in parallel, or in series-parallel. The plurality of battery cells 30 may be directly disposed in the case. That is, the plurality of battery cells 30 may be directly assembled into the battery 10, or the battery module 20 may be assembled first, and then the battery module 20 may be assembled into the battery 10. The battery cell 30 includes a lithium ion-containing secondary battery, a lithium ion primary battery, a lithium sulfur battery, a sodium lithium ion battery, or a magnesium ion battery, but is not limited thereto.

Referring to fig. 4, a battery cell 30 of the embodiment of the present application includes a case 31 and an electrode assembly 32 disposed in the case 31. The housing 31 of the embodiment of the present application has a square structure or other shapes. The case 31 has an inner space accommodating the electrode assembly 32 and the electrolyte and an opening 311 communicating with the inner space. The housing 31 may be made of a material such as aluminum, aluminum alloy, or plastic. The electrode assembly 32 is a core member of the battery cell 30 that performs a charge and discharge function.

The battery cell 30 of the embodiment of the present application further includes an end cap assembly, an electrode terminal 34, and an adaptor member 35. The end cap assembly is coupled to the housing 31 and closes the opening 311 of the housing 31. The end cap assembly includes an end cap 33 and a pressure relief mechanism 36. The end cap 33 has a mounting hole 33 a. For example, the end cap 33 and the housing 31 may be welded. The electrode terminals 34 are provided on the end cap 33. The electrode terminal 34 may have a circular or square shape, but is not limited thereto. The electrode terminals 34 are electrically connected to the electrode assembly 32 through the adaptor member 35. Two or more battery cells 30 may be connected in series, parallel, or series-parallel via respective electrode terminals 34.

The pressure relief mechanism 36 is provided to the end cap 33 and covers the mounting hole 33 a. The edge 33c of the pressure relief mechanism 36 may be connected to the end cap 33. The edge 33c of the pressure relief mechanism 36 refers to the peripheral contour of the pressure relief mechanism 36. The pressure relief mechanism 36 is configured to be activated to release the pressure when the internal pressure or the temperature of the battery cell 30 reaches a threshold value, that is, when the internal pressure value or the temperature value of the battery cell 30 reaches the threshold value, the pressure relief mechanism 36 is activated to release the internal pressure of the battery cell 30, so as to reduce the possibility of explosion of the battery cell 30.

Referring to fig. 5, the pressure relief mechanism 36 includes a first score 361 and a second score 362. Scoring refers to a recess formed in the pressure relief mechanism 36, such as by stamping or cutting away the material from the pressure relief mechanism 36. The first notch 361 is disposed in a central region of the pressure relief mechanism 36. The central area of the pressure relief mechanism 36 is an area away from the self edge 33 c. The second score 362 is connected to the first score 361. The first and

second scores

361 and 362 may extend in the same direction. The extending direction refers to a direction in which the first and

second scores

361 and 362 extend, but does not limit the shapes of the first and

second scores

361 and 362. The second notch 362 extends from one end of the first notch 361 toward the edge 33c of the pressure relief mechanism 36. The breaking stress of the portion of the pressure relief mechanism 36 corresponding to the first score 361 is smaller than the breaking stress of the portion of the pressure relief mechanism 36 corresponding to the second score 362. The breaking stress refers to a critical stress value that can be borne when the portion of the pressure relief mechanism 36 corresponding to the first notch 361 and the second notch 362 breaks. The pressure relief mechanism 36 may be tested using a stress testing apparatus and the stress threshold obtained.

When the internal pressure of the battery cell 30 increases or the temperature rises, the pressure relief mechanism 36 may rise toward the outside of the battery cell 30 due to load bearing stress. When the internal pressure or temperature of the battery cell 30 reaches a threshold value, a portion of the pressure relief mechanism 36 corresponding to the first notch 361 is broken first, and then the crack is expanded to a portion of the pressure relief mechanism 36 corresponding to the second notch 362 along the extending direction of the first notch 361, so that the portion of the pressure relief mechanism 36 corresponding to the second notch 362 is also broken, and the pressure relief mechanism 36 is exploded to relieve the pressure of the battery cell 30.

The end cap assembly of the embodiment of the present application is applied to the battery cell 30. The end cap assembly includes an end cap 33 and a pressure relief mechanism 36. The pressure relief mechanism 36 is configured to actuate to relieve the internal pressure of the battery cell 30 when the internal pressure or temperature of the battery cell 30 reaches a threshold value. When the internal pressure or temperature of the battery cell 30 reaches a threshold value, a portion of the pressure relief mechanism 36 corresponding to the first notch 361 is broken first, and then the crack is expanded toward a portion of the pressure relief mechanism 36 corresponding to the second notch 362 along the extending direction of the first notch 361, so that the portion of the pressure relief mechanism 36 corresponding to the second notch 362 may be broken. Because the first notch 361 is arranged in the central region of the pressure relief mechanism 36, when the internal pressure or temperature fluctuates during the normal use of the single battery 30, the stress magnitude fluctuation of the part of the pressure relief mechanism 36 corresponding to the first notch 361 is small, so that the fatigue aging condition is not easy to occur, and the possibility of accidental explosion and pressure relief of the pressure relief mechanism 36 not reaching the threshold value is reduced. The second notch 362 of the pressure relief mechanism 36 can guide the expansion direction and path of the blasting crack, so that the fracture position and the expansion size of the crack on the pressure relief mechanism 36 can be easily controlled, and the possibility that the blasting is insufficient and the blasting opening area is insufficient due to the fact that the expansion direction of the crack of the pressure relief mechanism 36 is not fixed is reduced.

In some embodiments, the pressure relief mechanism 36 includes opposing outer and

inner surfaces

36a, 36 b. The outer surface 36a of the pressure relief mechanism 36 faces away from the interior of the cell 30. The inner surface 36b of the pressure relief mechanism 36 faces the inside of the battery cell 30. First score 361 and second score 362 are disposed on outer surface 36 a. When the internal pressure of the battery cell 30 increases or the temperature rises, a force acts on the inner surface 36b of the pressure relief mechanism 36. The pressure relief mechanism 36 bulges outward so that the openings of the first and

second scores

361 and 362 become larger. Illustratively, the pressure relief mechanism 36 is a generally sheet-like structure. Two surfaces of the pressure relief mechanism 36 opposing in the thickness direction X thereof are an inner surface 36b and an outer surface 36a, respectively.

In some embodiments, the second score 362 extends to the edge 33c of the pressure relief mechanism 36. The second score 362 extends through the pressure relief mechanism 36 so that when the pressure relief mechanism 36 bursts, the crack can propagate along the second score 362 to the edge 33c of the pressure relief mechanism 36, so that the burst opening of the pressure relief mechanism 36 can be opened more, and the burst opening area is more sufficient, so as to complete the pressure relief more quickly.

In some embodiments, the second score 362 is spaced a predetermined distance from the edge 33c of the pressure relief mechanism 36, i.e., the second score 362 does not extend through the edge 33c of the pressure relief mechanism 36, such that the second score 362 is spaced a predetermined distance from the edge 33c of the pressure relief mechanism 36, which reduces the possibility of the second score 362 adversely affecting the connection between the edge 33c of the pressure relief mechanism 36 and the end cap 33.

In some embodiments, the first scores 361 are respectively provided with second scores 362 along two opposite sides of the extending direction of the first scores 361. After the portion of the pressure relief mechanism 36 corresponding to the first notch 361 is broken, the crack may expand to the second notch 362 area on both sides, so that the explosion opening of the pressure relief mechanism 36 may be opened more, and the explosion opening area is more sufficient, so as to complete the pressure relief more quickly.

In some embodiments, the pressure relief mechanism 36 has a predetermined length L1 and width W1. Here, the length L1 is greater than the width W1. The pressure relief mechanism 36 is a bar structure. First score 361 extends along length direction Y. The dimension L2 of the first score 361 in the length direction Y is less than 1/2 of the length L1 of the pressure relief mechanism 36. When the dimension L2 of the first notch 361 in the longitudinal direction Y is greater than or equal to 1/2 of the length L1 of the pressure relief mechanism 36, the overall mechanical strength of the pressure relief mechanism 36 is adversely affected. For example, the dimension of the second score 362 in the length direction Y may be greater than the dimension L2 of the first score 361 in the length direction Y.

In some embodiments, referring to fig. 6 and 7, the thickness of the portion of the pressure relief mechanism 36 corresponding to the first score 361 is less than the thickness of the portion of the pressure relief mechanism 36 corresponding to the second score 362 along the thickness direction X, such that the fracture stress of the portion of the pressure relief mechanism 36 corresponding to the first score 361 is less than the fracture stress of the portion of the pressure relief mechanism 36 corresponding to the second score 362. Illustratively, the depth of the first score 361 is greater than the depth of the second score 362 along the thickness direction X, so that the thickness of the portion of the pressure relief mechanism 36 corresponding to the first score 361 is less than the thickness of the portion of the pressure relief mechanism 36 corresponding to the second score 362. The pressure relief mechanism 36 is illustratively a uniform-thickness sheet, where uniform thickness means that the perpendicular distance between two surfaces of the pressure relief mechanism 36 in the thickness direction X is of equal value. The first score 361 and the second score 362 may be groove structures that start from one of the two surfaces of the pressure relief mechanism 36 and extend toward the other surface.

In some embodiments, referring to FIG. 8, the pressure relief mechanism 36 has a predetermined thickness. A part of the pressure relief mechanism 36 bulges along the thickness direction X to form a reinforcing part 36d, which is beneficial to improving the mechanical rigidity of the pressure relief mechanism 36 and reducing the possibility of accidental breakage of the part of the pressure relief mechanism 36 corresponding to the first notch 361 and/or the second notch 362 caused by bending of the pressure relief mechanism 36 in the transportation process or the production process. The first and

second scores

361 and 362 are provided on the concave surface of the reinforcement portion 36 d. Illustratively, a part of the pressure relief mechanism 36 bulges in the thickness direction X thereof toward the inside of the battery cell 30 to form a reinforcing portion 36 d.

In some embodiments, first score 361 and second score 362 each extend along a straight line such that first score 361 and second score 362 are in a straight-groove configuration. The crack generated by the explosion of the pressure relief mechanism 36 can be expanded along the linear direction, which is beneficial to improving the expansion speed of the crack. Illustratively, the first and

second scores

361 and 362 are elongated structures. For example, the cross-section of the first and

second scores

361 and 362 may be V-shaped, U-shaped, or circular arc-shaped. The cross-sections of the first and

second scores

361 and 362 refer to planes perpendicular to the extending direction of the first and

second scores

361 and 362.

In some embodiments, referring to fig. 9, the opening width K1 of first score 361 is greater than the opening width K2 of second score 362. Illustratively, the opening width K1 of the first score 361 is equal to the depth of the first score 361, and/or the opening width K2 of the second score 362 is equal to the depth of the second score 362.

In some embodiments, as shown in fig. 10 and 11, the number of first scores 361 is more than two. Two or more first scores 361 are disposed to intersect. More than two first scores 361 are arranged, and the parts, corresponding to the first scores 361, on the pressure relief mechanism 36 can be simultaneously broken, so that the blasting speed and the pressure relief efficiency are improved. Illustratively, at least one end of each first score 361 is provided with a second score 362. Illustratively, the intersection of two or more first scores 361 is located at the center of the pressure relief mechanism 36. Illustratively, the first score 361 extending along the width direction Z has a dimension W2 in the width direction Z that is less than 1/2 of the width W1 of the pressure relief mechanism 36. When the dimension W2 of the first notch 361 in the width direction Z is greater than or equal to 1/2 of the width W1 of the pressure relief mechanism 36, the overall mechanical strength of the pressure relief mechanism 36 is adversely affected. For example, the dimension of the second notch 362 in the width direction Z may be greater than the dimension W2 of the first notch 361 in the width direction Z.

In some embodiments, referring to fig. 12, the number of first scores 361 is more than two. Two or more first scores 361 are provided at intervals. Two adjacent first scores 361 are separated by a part of the pressure relief mechanism 36, and the structural design is beneficial to ensuring that the pressure relief mechanism 36 has good mechanical strength in the area where the first scores 361 are arranged. The second scores 362 are connected to the outermost first scores 361. In other embodiments, a second notch 362 may be disposed on a portion of the pressure relief mechanism 36 for separating two adjacent first notches 361, and the second notch 362 is connected to the first notches 361 on both sides.

The end cap assembly of the embodiment of the present application may be applied to the battery cell 30. The end cap assembly includes a pressure relief mechanism 36. The pressure relief mechanism 36 includes a first score 361 and a second score 362 connected. When the internal pressure or temperature of the battery cell 30 reaches a threshold value, a portion of the pressure relief mechanism 36 corresponding to the first notch 361 is broken first, then the crack expands to a portion of the pressure relief mechanism 36 corresponding to the second notch 362, and finally portions of the pressure relief mechanism 36 corresponding to the first notch 361 and the second notch 362 are opened in a burst mode, so that the internal pressure of the battery cell 30 is relieved, and the possibility of explosion of the battery cell 30 is reduced. The second notch 362 can guide the crack formed after the part of the pressure relief mechanism 36 corresponding to the first notch 361 is broken to expand along the extending direction of the second notch 362, so that the expanding direction of the crack can be controlled, the preset area on the pressure relief mechanism 36 is broken, and the possibility that the explosion of the pressure relief mechanism 36 is insufficient and the explosion opening area is insufficient due to the fact that the expanding direction of the crack is not fixed is reduced.

While the present application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the present application, and in particular, features shown in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not intended to be limited to the particular embodiments disclosed herein but is to cover all embodiments that may fall within the scope of the appended claims.

Claims

1. An end cap assembly for a battery cell, the end cap assembly comprising:

an end cap having a mounting hole;

a pressure relief mechanism for actuating to relieve pressure when the internal pressure or temperature of the battery cell reaches a threshold value; pressure release mechanism covers the mounting hole, pressure release mechanism includes first nick and second nick, first nick set up in pressure release mechanism's central zone, the second nick with first nick links to each other, first nick with the extending direction of second nick is the same, the second nick is followed the one end orientation of first nick pressure release mechanism's edge extends, in the pressure release mechanism with first nick corresponds partial fracture stress and is less than in the pressure release mechanism with the second nick corresponds partial fracture stress.

2. An end cap assembly according to claim 1, wherein the pressure relief mechanism includes an outer surface facing away from the interior of the battery cell, the first score and the second score being disposed on the outer surface.

3. The end closure assembly of claim 1, wherein said second score extends to an edge of said pressure relief mechanism; alternatively, the second score is spaced a predetermined distance from an edge of the pressure relief mechanism.

4. The end closure assembly of claim 1, wherein said first score is provided with said second score along opposite sides of said first score in a direction of extension of said first score.

5. The end closure assembly of claim 1, wherein said first score is two or more in number, wherein said two or more first scores intersect.

6. An end closure assembly according to claim 5, wherein the intersection of two or more first scores is located at the center of said pressure relief mechanism.

7. The end closure assembly of claim 1, wherein a portion of said pressure relief mechanism bulges along its thickness to form a reinforcement, and said first score and said second score are disposed on a recessed surface of said reinforcement.

8. An end closure assembly according to claim 1, wherein said pressure relief mechanism has a predetermined length and width, said first score extending along a length direction, said first score having a dimension in said length direction less than 1/2 of said length; alternatively, the first score extends in a width direction, the first score having a dimension in the width direction that is less than 1/2 of the width.

9. The end closure assembly of claim 1, wherein a thickness of a portion of said pressure relief means corresponding to said first score is less than a thickness of a portion of said pressure relief means corresponding to said second score.

10. The end closure assembly of claim 9, wherein said pressure relief mechanism is an isopachs, and wherein said first score has a depth greater than a depth of said second score.

11. The end closure assembly of claim 1, wherein said first score is two or more, said two or more first scores being spaced apart, said second score being connected to said outermost first score.

12. The end closure assembly of claim 1, wherein said first score has an opening width greater than said second score.

13. The end closure assembly of claim 1, wherein said first score and said second score each extend along a straight line.

14. A battery cell, comprising:

a housing having an opening;

an electrode assembly housed within the case;

the end cap assembly of any one of claims 1 to 13, wherein the end cap is connected to the housing and covers the opening, and a portion of the pressure relief mechanism corresponding to the first score and a portion of the pressure relief mechanism corresponding to the second score are configured to break to relieve pressure when an internal pressure or temperature of the battery cell reaches a threshold value.

15. A battery comprising the cell of claim 14.

16. An electrical device comprising a battery as claimed in claim 15 for providing electrical energy.