CN220492010U - Top cap subassembly, battery and consumer - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly, a battery and electric equipment, wherein the top cover assembly comprises a cover plate body and a conductive part, the cover plate body is provided with a weak part, the weak part is arranged on the cover plate body in a surrounding manner, the cover plate body is divided into a first area and a second area by the weak part, the first area is positioned in the second area, the conductive part is electrically connected with the first area, or the conductive part is electrically connected with a part of the weak part, and the sum of the thickness of the conductive part and the thickness of the part of the weak part is smaller than the thickness of the cover plate body; when the battery thermal runaway, the cover plate body can be broken along the weak portion, and the weak portion is separated from the cover plate body, so that the conductive portion can be disconnected with the electric connection of the cover plate body, the battery can be disconnected with an external circuit, the negative effect of the battery thermal runaway is reduced, and explosion of the battery thermal runaway is prevented.

Description

Top cap subassembly, battery and consumer

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly, a battery and electric equipment.

Background

Today, with the rapid growth of population and the rapid development of socioeconomic, resources and energy are gradually in shortage, environmental protection is increasingly emphasized, and energy development and saving are an important issue in the world today. Energy is the basis for the existence and development of human society, and modern society based on mineral energy is increasingly subjected to the crisis of energy depletion and environmental pollution. Meanwhile, with the advent of the informationized high-tech age, energy application forms are changing, and the demand for renewable, pollution-free, small-sized and discrete mobile high-performance power supplies is rapidly increasing. Green and efficient secondary batteries are being developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large energy storage, electric traffic power sources and the like.

In the prior art, a cover plate of a cylindrical battery is generally provided with an explosion-proof score or explosion-proof valve, and when the internal pressure of the battery reaches a threshold value, the cover plate is ruptured along a weak portion to release the internal pressure of the battery. However, the existing tab is generally electrically connected with the cover plate or the electrode post, and after the explosion-proof notch or the explosion-proof valve is disconnected, the tab is still electrically connected with the cover plate or the electrode post, so that the battery cannot be disconnected with an external circuit, further the negative effect of the battery is aggravated, the battery is easy to explode, and the personal safety is influenced.

Disclosure of Invention

One of the objects of the present utility model is: the top cover assembly is provided to solve the problem that after an explosion-proof nick or an explosion-proof valve in the prior art is disconnected, a tab is still electrically connected with a cover plate or a pole, so that a battery cannot be disconnected with an external circuit, and further negative effects of the battery are aggravated.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the utility model provides a top cap subassembly, includes apron body and electrically conductive portion, the apron body the first face is provided with the weak portion, the weak portion is encircled and is located on the apron body, just the weak portion will the apron body is divided into first region and second region, wherein, first region is located the inside of second region, electrically conductive portion with first region electricity is connected, perhaps electrically conductive portion with the partial electricity of weak portion is connected, just the thickness of electrically conductive portion with the thickness sum of the partial thickness of weak portion is less than the thickness of apron body.

Preferably, the weak portion includes first pressure release portion and second pressure release portion, first pressure release portion with second pressure release portion all is the arc, first pressure release portion with second pressure release portion encloses into the ring-shaped, first pressure release portion with one of the second pressure release portion with electrically conductive portion electricity is connected.

Preferably, the width of the second pressure relief portion is smaller than the width of the first pressure relief portion.

Preferably, the thickness of the second pressure relief portion is smaller than the sum of the thickness of the first pressure relief portion and the thickness of the conductive portion, and the conductive portion is electrically connected with the first pressure relief portion.

Preferably, the thickness of the second pressure release part is uniformly distributed.

Another object of the utility model is: the utility model provides a battery, including the top cap subassembly that the description was foretell, still include casing and electric core, the electric core set up in the casing, the top cap subassembly is sealed the opening of casing, the electric core includes first utmost point ear, first utmost point ear with weak portion or electrically conductive portion electricity is connected.

Preferably, the battery cell further comprises a second tab, the first tab and the second tab are opposite in polarity and are respectively located at two ends of the battery cell, an electrode leading-out hole is formed in the shell, an electrode terminal is arranged at the position of the electrode leading-out hole of the shell, the electrode terminal is connected with the shell in an insulating manner, and the second tab is electrically connected with the electrode terminal

Preferably, a second switching piece is connected between the second tab and the electrode terminal.

Preferably, an insulating member is provided at the bottom of the case, and the electrode terminal is connected to the second transfer sheet through the insulating member.

Yet another object of the present utility model is: there is provided a powered device comprising a battery as hereinbefore described in the description.

The utility model has the beneficial effects that the cover plate body is provided with the weak part, so that when the battery is in thermal runaway, namely the internal pressure of the battery reaches the threshold value, the cover plate body can be broken along the weak part to release the internal pressure of the battery. The weak portion is encircled and is located the apron body, and divide into first region and second region with the apron body, first region is located the second region inside, after the weak portion breaks, because the part electricity of conductive part and first region or weak portion is connected, and the thickness sum of the thickness of conductive part and the thickness of weak portion is less than the thickness of apron body, weak portion and apron body separation for the conductive part can break the electricity with the apron body and be connected, and then make the battery can break the connection with external circuit, reduce the negative effect after the battery thermal runaway, prevent that explosion from taking place after the battery thermal runaway, improve the security of battery.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic view of the structure of a battery according to the present utility model.

Fig. 2 is an exploded view of the battery of the present utility model.

Fig. 3 is a schematic cross-sectional structure of the battery of the present utility model.

Fig. 4 is a schematic diagram of the structure at a in fig. 3.

Fig. 5 is a schematic diagram of the structure at B in fig. 3.

Fig. 6 is another structural schematic diagram of the battery of the present utility model.

Fig. 7 is a schematic view of the structure of the cap assembly of the present utility model.

Fig. 8 is another structural view of the cap assembly of the present utility model.

Fig. 9 is a schematic structural view of the cover plate body of the present utility model.

Wherein reference numerals are as follows:

100. a battery;

10. a housing; 11. a sidewall; 12. a bottom wall; 121. electrode lead-out holes; 13. an electrode terminal;

20. a top cover assembly;

21. a cover plate body; 21a, a first region; 21b, a second region; 211. a weak portion; 2111. a first pressure relief portion; 2112. a second pressure relief portion; 214. a liquid injection hole; a. the width of the first pressure relief part; b. the width of the second pressure relief part;

22. a conductive portion;

23. sealing nails;

30. a battery cell; 31. a first tab; 32. a second lug;

40. a second switching piece;

50. an insulating member.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the utility model. The appearances of such phrases 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.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The utility model is described in further detail below with reference to fig. 1-9, but is not intended to be limiting.

The electric equipment comprises a battery 100. The electric equipment can be an automobile, a mobile phone, portable equipment, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool and the like. The automobile can be a fuel oil automobile, a fuel gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range-extended automobile and the like; spacecraft including airplanes, rockets, space planes, spacecraft, and the like; the electric toy includes fixed or mobile electric toys, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy; power tools include metal cutting power tools, grinding power tools, assembly power tools, and railroad power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete shakers, and electric planers, among others. The embodiment of the application does not limit the electric equipment in particular.

Referring to fig. 1-5, a battery 100 according to an embodiment of the utility model includes a top cap assembly 20, a housing 10, and a battery cell 30, wherein the battery cell 30 is disposed in the housing 10, and the top cap assembly 20 seals an opening of the housing 10.

The casing 10 of the embodiment of the present utility model is a hollow structure with an opening at one side, and the top cover assembly 20 covers the opening of the casing 10 and forms a sealing connection, so as to form a containing cavity for containing the battery cell 30 and the electrolyte.

Specifically, the housing 10 includes a side wall 11 and a bottom wall 12, the side wall 11 surrounds the outside of the battery cell 30, and the bottom wall 12 is connected to one end of the side wall 11. The side wall 11 has a cylindrical structure, and the bottom wall 12 has a plate-like structure, and the shape thereof corresponds to the shape of the side wall 11. Optionally, an opening is formed at one end of the side wall 11, and the bottom wall 12 is connected to the end of the side wall 11 facing away from the opening.

It should be noted that the side wall 11 and the bottom wall 12 may be integrally formed, i.e., the housing 10 is an integrally formed member. Of course, the side wall 11 and the bottom wall 12 may also be two members provided separately and then joined together by welding, riveting, bonding, or the like.

In some embodiments, the case 10 is provided with an electrode lead-out hole 121, and the case 10 is provided with an electrode terminal 13 at the electrode lead-out hole 121, and the electrode terminal 13 is connected with the case 10 in an insulating manner. Specifically, the electrode lead-out hole 121 is provided on the bottom wall 12, and the electrode terminal 13 and the bottom wall 12 may have different polarities.

Further, an insulating seal is provided in the electrode lead-out hole 121, and the insulating seal is provided between the electrode terminal 13 and the bottom wall 12.

The cross section of the electrode terminal 13 is rectangular, trapezoidal, i-shaped, or T-shaped. In use, the shape of the electrode terminal 13 may be set according to actual requirements.

Referring to fig. 6-9, the top cover assembly 20 of the embodiment of the utility model includes a cover body 21 and a conductive portion 22, the cover body 21 is provided with a weak portion 211, the weak portion 211 is disposed on the cover body 21 in a surrounding manner, and the cover body 21 is divided into a first area 21a and a second area 21b by the weak portion 211, wherein the first area 21a is located inside the second area 21b, the conductive portion 22 is electrically connected with the first area 21a, or the conductive portion 22 is electrically connected with a portion of the weak portion 211, and the sum of the thickness of the conductive portion 22 and the thickness of the portion of the weak portion 211 is smaller than the thickness of the cover body 21. .

Compared with the prior art, in the top cap assembly 20 of the embodiment of the present utility model, by providing the weak portion 211 on the cap plate body 21, when the battery 100 is thermally out of control, i.e., the internal pressure of the battery 100 reaches the threshold value, the cap plate body 21 is ruptured along the weak portion 211 to release the internal pressure of the battery 100. The weak portion 211 is arranged on the cover plate body in a surrounding mode, the cover plate body 21 is divided into a first area 21a and a second area 21b, the first area 21a is located in the second area 21b, after the weak portion 211 is broken, the conductive portion 22 is electrically connected with the first area 21a or a part of the weak portion 211, the sum of the thickness of the conductive portion 22 and the thickness of the part of the weak portion 211 is smaller than the thickness of the cover plate body 21, the weak portion is separated from the cover plate body 21, the conductive portion 22 can be disconnected from the cover plate body 21, the battery 100 can be disconnected from an external circuit, the negative effect after thermal runaway of the battery 100 is reduced, explosion of the battery 100 is prevented, and the safety of the battery 100 is improved.

It should be noted that, the top cover assembly 20 and the housing 10 may be connected by welding, so that the top cover assembly 20 and the housing 10 may have the same polarity. The cap assembly 20 and the case 10 may be made of the same material or may be made of different materials.

The conductive portion 22 may be the first tab or the tab.

In some embodiments, the weak portion 211 includes a first pressure relief portion 2111 and a second pressure relief portion 2112, the first pressure relief portion 2111 and the second pressure relief portion 2112 are arc-shaped, the first pressure relief portion 2111 and the second pressure relief portion 2112 enclose a ring, and one of the first pressure relief portion 2111 and the second pressure relief portion 2112 is electrically connected with the conductive portion 22. Through the cooperation of first pressure release portion 2111 and second pressure release portion 2112, first pressure release portion 2111 and second pressure release portion 2112 are the arc, first pressure release portion 2111 and second pressure release portion 2112 enclose into the ring-shaped, when battery 100 thermal runaway, that is, when the internal pressure of battery 100 reaches the threshold, first pressure release portion 2111 and second pressure release portion 2112 break, weak portion 211 and apron body 21 separation, because one of first pressure release portion 2111 and second pressure release portion 2112 is connected with electrically conductive portion 22 electricity, electrically conductive portion 22 can break the electricity with apron body 21 and be connected, and then make battery 100 can break the connection with external circuit, reduce the negative effect behind the battery 100 thermal runaway, prevent that explosion from taking place behind the battery 100 thermal runaway, improve the security of battery 100.

The weakened portion 211 is annular.

In some embodiments, the width b of the second relief portion 2112 is less than the width a of the first relief portion 2111. Through the width a of first pressure release portion 2111 and the width b of second pressure release portion 2112 setting, width b of second pressure release portion 2112 is less than width a of first pressure release portion 2111, when electrically connected with first pressure release portion 2111 of electrically conductive portion 22, the effectual area of contact of increase first pressure release portion 2111 and electrically conductive portion 22 guarantees the overcurrent ability between electrically conductive portion 22 and apron body 21.

In some embodiments, the thickness of the second pressure relief portion 2112 is less than the sum of the thickness of the first pressure relief portion 2111 and the thickness of the conductive portion 22, the conductive portion 22 being electrically connected to the first pressure relief portion 2111. Through the thickness of the first pressure relief portion 2111 and the thickness of the second pressure relief portion 2112, the thickness of the second pressure relief portion 2112 is smaller than the sum of the thickness of the first pressure relief portion 2111 and the thickness of the conductive portion 22, and it is effectively ensured that the first pressure relief portion 2111 and the second pressure relief portion 2112 can be ruptured when the battery is thermally out of control.

In some embodiments, the thickness b of the second pressure relief portion 2112 is uniformly distributed. When the battery 100 is thermally out of control, that is, when the internal pressure of the battery 100 reaches a threshold value, the second pressure relief portion 2112 may be uniformly ruptured due to the uniform thickness distribution of the second pressure relief portion 2112.

In some embodiments, the middle part of the cover plate body 21 is provided with a liquid injection hole 214, and the cover plate body 21 is provided with a sealing nail 23 at the position of the liquid injection hole 214. Through the arrangement of the liquid injection holes 214, after the top cover assembly 20 is installed at the opening of the shell 10, the battery 100 can inject electrolyte into the battery 100 through the liquid injection holes 214, and then the liquid injection holes 214 are sealed by the sealing nails 23, so that the liquid injection of the battery 100 is facilitated.

Specifically, the cross-sectional shape of the liquid injection hole 214 is one of rectangular, trapezoidal, T-shaped, and i-shaped, and can be set according to actual requirements when in use.

Note that, the conductive portion 22 is provided with a through hole, and when the cap assembly 20 is mounted to the opening of the case 10, the through hole corresponds to the position of the liquid injection hole 214, so that the liquid injection of the battery 100 is facilitated.

The battery cell 30 according to the embodiment of the present utility model includes a first tab 31 and a second tab 32, the polarities of the first tab 31 and the second tab 32 are opposite and are respectively located at two ends of the battery cell 30, the first tab 31 is electrically connected to the conductive portion 22, and the second tab 32 is electrically connected to the electrode terminal 13. The first tab 31 and the second tab 32 are disposed at two ends of the battery cell 30, so that the risk of conducting the first tab 31 and the second tab 32 can be reduced, and the overcurrent area of the first tab 31 and the overcurrent area of the second tab 32 can be increased.

Note that, in the case where the first tab 31 is a negative electrode tab and the second tab 32 is a positive electrode tab, the cap plate body 21 is a negative output electrode of the battery 100, and the electrode terminal 13 is a positive output electrode of the battery 100. Conversely, the first tab 31 is a positive tab, the second tab 32 is a negative tab, the cap plate body 21 is a positive output electrode of the battery 100, and the electrode terminal 13 is a negative output electrode of the battery 100.

Specifically, the battery cell 30 further includes a first pole piece, a second pole piece, and a diaphragm disposed between the first pole piece and the second pole piece. The polarities of the first pole piece and the second pole piece are opposite, in other words, one of the first pole piece and the second pole piece is a positive pole piece, and the other of the first pole piece and the second pole piece is a negative pole piece. The first tab 31 is disposed on the first pole piece, and the second tab 32 is disposed on the second pole piece.

Optionally, the first pole piece, the second pole piece and the diaphragm are all in a strip-shaped structure, and the first pole piece, the second pole piece and the diaphragm are wound into a whole to form a winding structure. The coiled structure may be a cylindrical structure, a flat structure, or other shaped structure.

Further, the first pole piece comprises a first current collector and a first active material layer, the first active material layer is coated on the surface of the first current collector, the second pole piece comprises a second current collector and a second active material layer, and the second active material layer is coated on the surface of the second current collector. Taking the lithium ion battery 100 as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate, or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator can be PP (polypropylene), polypropylene or PE (polyethylene), polyethylene, etc.

In some embodiments, a second switching piece 40 is connected between the second tab 32 and the electrode terminal 13. The second tab 32 may be electrically connected to the motor terminal through the second switching piece 40, and the second switching piece 40 may increase a contact area with the second tab 32.

In some embodiments, the bottom of the case 10 is provided with an insulating member 50, and the electrode terminal 13 is connected with the second switching piece 40 through the insulating member 50. By providing the insulating member 50, the insulating member 50 serves to prevent the second switching piece 40 from contacting the bottom wall 12 of the case 10 to cause a short circuit of the battery 100, thereby improving the safety of the battery 100.

The edge of the insulating member 50 is provided with a flange for isolating the second tab 32 from the side wall 11 of the case 10, and preventing the second tab 32 from contacting the side wall 11 of the case 10 to cause the battery 100 to be shorted.

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. A top cap subassembly, characterized in that: including apron body (21) and electrically conductive portion (22), apron body (21) are provided with weak portion (211), weak portion ring is located on apron body (21), just weak portion (211) will apron body (21) are divided into first region (21 a) and second region (21 b), wherein, first region (21 a) are located the inside of second region (21 b), electrically conductive portion (22) with first region (21 a) electricity is connected, or electrically conductive portion (22) with the part electricity of weak portion (211), just the thickness of electrically conductive portion (22) with the sum of thickness of the part of weak portion (211) is less than the thickness of apron body (21).

2. The header assembly of claim 1, wherein: the weak portion (211) comprises a first pressure relief portion (2111) and a second pressure relief portion (2112), the first pressure relief portion (2111) and the second pressure relief portion (2112) are arc-shaped, the first pressure relief portion (2111) and the second pressure relief portion (2112) are annular in surrounding mode, and one of the first pressure relief portion (2111) and the second pressure relief portion (2112) is electrically connected with the conductive portion (22).

3. The header assembly of claim 2, wherein: the width (b) of the second pressure relief portion (2112) is smaller than the width (a) of the first pressure relief portion (2111).

4. The header assembly of claim 2, wherein: the thickness of the second pressure relief portion (2112) is smaller than the sum of the thickness of the first pressure relief portion (2111) and the thickness of the conductive portion (22), and the conductive portion (22) is electrically connected with the first pressure relief portion (2111).

5. The header assembly of claim 2, wherein: the thickness of the second pressure relief part (2112) is uniformly distributed.

6. A battery, characterized in that: the top cover assembly according to any one of claims 1 to 5, further comprising a housing (10) and a battery cell (30), wherein the battery cell (30) is arranged in the housing (10), the top cover assembly (20) seals an opening of the housing (10), the battery cell (30) comprises a first tab (31), and the first tab (31) is electrically connected with the weak portion (211) or the conductive portion (22).

7. The battery of claim 6, wherein: the battery cell (30) further comprises a second lug (32), the polarities of the first lug (31) and the second lug (32) are opposite and are respectively located at two ends of the battery cell (30), an electrode leading-out hole (121) is formed in the shell (10), an electrode terminal (13) is arranged at the position, located at the electrode leading-out hole (121), of the shell (10), the electrode terminal (13) is connected with the shell (10) in an insulating mode, and the second lug (32) is electrically connected with the electrode terminal (13).

8. The battery of claim 7, wherein: a second switching piece (40) is connected between the second lug (32) and the electrode terminal (13).

9. The battery of claim 8, wherein: an insulating member (50) is provided at the bottom of the case (10), and the electrode terminal (13) is connected to the second switching piece (40) through the insulating member (50).

10. An electrical consumer, characterized in that: a battery comprising a battery according to any one of claims 6 to 9.