CN217768558U - Cover plate, battery and electronic device - Google Patents

Abstract

The utility model discloses an apron, battery and electron device. The utility model discloses in, an apron includes: the cover plate comprises a cover plate main body, a first hole is formed in the cover plate main body, and a boss surrounding the periphery of the first hole is arranged on the cover plate main body; gao Wenpian arranged on the top of the cover plate main body and extending along the length direction of the cover plate main body, the high temperature resistant sheet is provided with a weak part, and the weak part is at least partially positioned in the first hole along the orthographic projection perpendicular to the cover plate main body direction; wherein the high temperature resistant piece is also provided with a shielding part for covering the first hole and two extending parts which are bent and extend downwards from the shielding part along the two ends of the length direction of the cover plate main body. Compared with the prior art to when thermal runaway takes place, reduce chain reaction between the battery, prevent such serious occurence of failure of fire, guaranteed the holistic security of battery and stability, further increase of service life, and also prevent in the battery use that the foreign matter from falling into first downtheholely.

Description

Cover plate, battery and electronic device

Technical Field

The utility model relates to a battery technology field, in particular to apron, battery and electron device.

Background

In recent years, the rapid rise of new energy automobiles brings great promotion to the sustainable development of society and the harmonious coexistence of human beings and the environment. Among various conceptual new energy vehicles, electric vehicles have been technically mass-produced, and are receiving more and more attention and favor with government support. As a solution to the energy and environmental problems, the key technology in electric vehicles is replacing the rechargeable battery pack used by gasoline and fuel engines as a power source.

The existing rechargeable battery pack is internally provided with a plurality of batteries which are connected in a battery shell through a proper series-parallel connection structure, so that the design not only can meet the relatively high energy density requirement of the electric automobile, but also can flexibly adjust the series-parallel connection mode in the batteries according to different design requirements of various automobiles, and the practicability is high. However, when one battery in the battery pack is out of control due to heat generation, the high-temperature substances sprayed by the battery can affect other batteries, so that the other batteries are also out of line and the out of control due to heat generation is caused, and further, the whole battery pack is out of control due to heat generation, so that fire and other conditions are caused.

SUMMERY OF THE UTILITY MODEL

However, in actual research and development, the inventors found that when a battery is subjected to thermal runaway, gaseous and liquid reaction substances are generated and generate a great amount of reaction heat, and the combination of the gaseous and liquid reaction substances may cause the original external structure of the battery to be damaged. The generated gaseous and liquid reaction substances are ejected from the inside of the battery, and the reaction heat is also conducted to the surroundings, thereby causing secondary influence on the adjacent battery. In particular, it is easy to cause damage to the mechanical structure of the battery by high-temperature substances generated by thermal runaway breaking the outer coating structure of the battery and splashing to the cover plate of the adjacent battery. Even high-temperature substances enter the adjacent batteries through the first holes of the adjacent batteries, so that thermal runaway also occurs in the adjacent batteries, chain reaction is caused, and finally even fire is caused.

An object of the utility model is to provide an apron, battery and electron device to when the thermal runaway takes place, reduce the chain reaction between the battery, prevent such serious occurence of failure of fire, guaranteed the holistic security of battery and stability, further increase of service life, and also prevent in the battery use that the foreign matter from falling into first downthehole.

In order to solve the above technical problem, an embodiment of the present invention provides an apron including: the cover plate comprises a cover plate main body, a first hole is formed in the cover plate main body, and a boss surrounding the periphery of the first hole is arranged on the cover plate main body; gao Wenpian, which is arranged on the top of the cover plate main body and extends along the length direction of the cover plate main body, and the high-temperature resistant sheet is provided with a weak part, and the weak part is at least partially positioned in the first hole along an orthographic projection perpendicular to the direction of the cover plate main body; the high-temperature resistant sheet is also provided with a shielding part for covering the first hole and two extending parts which are bent and extend downwards from the shielding part along the two ends of the cover plate main body in the length direction.

In an embodiment, the high temperature resistant sheet further includes a main body portion connected to the two extending portions, respectively, and extending along a length direction of the cover plate main body. The structure of the high-temperature resistant sheet more fitting the cover plate main body is more stable in connection.

In one embodiment, a protective film is arranged on the upper surface of the boss, and the distance between the shielding part and the protective film is 0.5mm to 1mm. The protection film sets up on the boss, and the boss is held the protection film with high temperature resistant piece holder, lets the better cover of protection film on first hole, prevents that the foreign matter from getting into first downthehole.

In one embodiment, the upper surface of the boss is provided with a protective film, and the protective film is clamped between the Gao Wenpian and the boss.

In one embodiment, the high temperature resistant sheet is a unitary member. The integrated member can be assembled more efficiently and is manufactured at a low cost.

In one embodiment, the main body extends to the edge of the cover main body in the length direction, and the main body has a through hole for a post to pass through.

In one embodiment, the cover body has a second aperture; the main body part is located between the boss and the second hole.

In one embodiment, the thickness of the shielding part ranges from 0.2mm to 1mm; the thickness of the main body part ranges from 0.1mm to 1mm.

In one embodiment, the thickness of the shielding portion is smaller than or equal to the thickness of the main body portion. Therefore, the main body part can separate the high-temperature substance from the cover plate main body, the shielding part also prevents the high-temperature substance from falling into the battery from the first hole, and the thickness of the shielding part can be more suitable for the rupture of the battery during pressure relief.

In one embodiment, the weakened portion is a crack or a plurality of holes. When thermal runaway occurs in the battery, high-pressure gas in the battery can break the weak part, so that explosion of the battery is avoided.

In one embodiment, when the weakened portion is a plurality of linear structures, at least two of the lines intersect or extend.

The utility model discloses an embodiment still provides a battery, include: the cover plate as claimed in any one of the above; the cover plate is arranged at the opening and closes the opening; the battery cell is arranged in the shell.

The utility model discloses an embodiment still provides an electron device, includes as above the battery.

The utility model discloses embodiment is for prior art, because still be provided with high temperature resistant piece in the apron main part of battery, this high temperature resistant piece covers the apron main part, can block that the high temperature material who comes from other batteries enters into in the battery from first hole. Therefore, the situation that under the condition that one battery is subjected to thermal runaway, other batteries are subjected to spread to generate linkage thermal runaway is avoided, and the probability of thermal runaway diffusion is reduced. Meanwhile, the weak part of the high-temperature resistant sheet is positioned above the first hole and can be broken under a certain condition, so that a channel communicated with the outside atmosphere inside the battery is formed, high pressure or high temperature accumulated inside the battery is released to the outside, and the normal function of the explosion-proof mechanism right below the Gao Wenpian is ensured. That is to say, through setting up the utility model discloses in such apron, can further reduce the probability that thermal runaway takes place chain diffusion when guaranteeing the explosion-proof mechanism normal work originally, reduced the whole possibility of exploding or catching fire of battery from this, improve the security of battery. And the high temperature resistant piece is provided with a shielding part and an extending part, so that the high temperature resistant piece is better arranged on the cover plate main body.

Drawings

Fig. 1 is a schematic structural diagram of a battery according to an embodiment of the present invention;

fig. 2 is an exploded view of a cover plate in an embodiment in accordance with the present invention;

fig. 3 is an exploded view of a battery according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a battery in an embodiment in accordance with the present invention;

FIG. 5 is an enlarged view of a portion of FIG. 4;

wherein, 1, a cover plate; 11. a cover plate main body; 111. a first hole; 112. a boss; 113. a second hole; 12. gao Wenpian; 1211. an aperture; 122. a shielding portion; 123. a main body part; 1231. a through hole; 124. an extension portion; 13. a protective film; 2. a housing; 21. an opening; 3. an electric core; 4. an explosion-proof valve; 5. a positive post; 6. and a negative pole.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following describes each embodiment of the present invention in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity, the structure and operation of the present invention will be described with the aid of directional terms, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be understood as words of convenience and not as words of limitation.

Embodiments of the present invention are described below with reference to the drawings.

An embodiment of the utility model provides an electronic device, this electronic device include the battery, and this electronic device can be electric automobile or electric motorcycle car etc.. A battery assembly typically includes several groups of batteries.

Fig. 1, 2, 4 and 5 show a battery including a cap plate 1 and a case 2 opened at an upper portion. The cover plate 1 is disposed at an opening of the case 2 and seals it. The cover plate 1 includes a cover plate main body 11, a high temperature resistant sheet 12, and a protective film 13. The shape of the cover main body 11 matches the shape of the opening of the housing 2. Since the case 2 is shown as a rectangular box shape in the present embodiment, the cover main body 11 is adaptively formed in an elongated shape. It should be understood by those skilled in the art that when the case 2 of the battery is formed in other shapes, the shape of the cap main body 11 can be formed in other shapes accordingly as long as the cap main body 11 can seal the opening of the case 2. A plurality of battery cells 3 are arranged in a sealed space formed by the shell 2 and the cover plate 1, and the battery cells 3 are closely arranged in the shell 2 and are electrically connected with each other to jointly form a charging and discharging assembly of the battery assembly. It will be appreciated that a cell may also be placed within the housing 2.

When the case 2 has a rectangular box shape, openings may be provided at both ends in the longitudinal direction, and in this case, the cover plate 1 may cover the openings at both ends.

As shown in fig. 2 and 4, a first hole 111 is opened in the cover main body 11, the explosion-proof valve 4 is attached to the first hole 111, and the explosion-proof valve 4 may have a sheet structure attached to the first hole 111. Two second holes 113 are further formed in the cover plate main body 11, the positive pole 5 and the negative pole 6 respectively penetrate through one of the second holes 113 and are convexly arranged on the cover plate 1, and the positive pole 5 and the negative pole 6 are electrically connected with the battery cell 3 inside the casing 2. In the present embodiment, the first hole 111 is disposed at the center of the cover plate body 11 in the length direction, and the second holes 113 are symmetrically disposed at two sides of the first hole 111 and respectively close to two ends of the cover plate 1 in the length direction. The first hole 111 is formed in an elongated shape having circular arcs at both ends thereof, and the second hole 113 is formed in a substantially rectangular shape. However, this is merely an example, and those skilled in the art can arbitrarily adjust the relative arrangement relationship, shape and size of the first hole and the second hole 113 according to actual needs. The cover plate body 11 has a boss 112 surrounding the outer edge of the first hole 111. The protective film 13 is connected to the boss 112 and covers the first hole 111. The protection film 13 is attached to the boss 112, the high temperature resistant sheet 12 is attached to the top of the cover plate body 11 and covers the protection film 13, and the protection film 13 is sandwiched between the high temperature resistant sheet 12 and the boss 112. It can be understood that there is a gap between the protective film and the high temperature resistant sheet, and the protective film 13 can be considered to be clamped between the high temperature resistant sheet 12 and the boss 112 when the gap is different in size, such as 0.1mm, 0.2mm or 0.3 mm. Of course, there may be no gap between the protective film and the refractory sheet.

Specifically, the high temperature resistant sheet 12 may be adhered to the upper surface of the cover plate body 11 by an adhesive, and the high temperature resistant sheet 12 is further adhered to the protective film 13, and the high temperature resistant sheet presses the protective film 13 on the boss 112, so that the structure is more stable. It can be understood that the high temperature resistant protective film 13 and the protective film 13 may be adhered to each other without being adhered to each other. The high temperature resistant sheet 12 has substantially the same shape as the cover plate body 11, and is bonded and fixed to the cover plate body 11. The high temperature resistant sheet 12 may be a mica sheet, a ceramic sheet, a glass sheet, or the like. Preferably, the refractory sheet 12 has a thickness of 0.2mm to 1mm and can withstand temperatures up to 1000 degrees celsius.

When thermal runaway occurs in one of the plurality of cells, high-temperature substances generated inside the cell splash out of the first hole 111 and may break through the weak portion of the high-temperature-resistant sheet 12. However, since the high temperature resistant sheet 12 is further provided on the cap plate 1 of the battery to cover the cap plate main body 11, the high temperature material is prevented from directly contacting the cap plate 11, so that the structure of the cap plate 11 is not damaged. And the high-temperature resistant sheet 12 also covers the first hole 111, so that high-temperature substances can be prevented from entering the battery from the first hole 111, and the probability of thermal runaway diffusion is reduced. And the protective film 13 covers the first hole 111, so as to prevent dust and foreign matters such as dust on the high temperature resistant sheet 12 from falling into the first hole 111, and further protect the first hole 111. And the protective film 13 is an explosion-proof film, and can be a plastic film, a silicon mold and the like. The internal pressure relief of the battery is not influenced.

Further, as shown in fig. 2 and 3, the high temperature resistant sheet 12 has a weak portion located at least partially in the first hole 111 in an orthogonal projection in a direction perpendicular to the cover main body 11. The weak portion includes two intersecting linear structures, and the intersection of the two linear structures is located at the center of the first hole 111. The line-shaped structure formed by the arrangement of the plurality of holes 1211 is shown in fig. 2 and 4, but is not limited thereto. It will be understood by those skilled in the art that the shape of the weakened portion is not limited to the above-listed shapes, but may be other shapes, such as a linear fracture, as long as the weakened portion is easily broken when the air pressure is increased. More specifically, the weak portion is preferably a structure that causes damage to the high temperature-resistant sheet 12 in a range of 1/4 to 3/4 of the thickness thereof. The line-shaped structure may be a straight line or a curved line, and the intersection point of the line-shaped structures may not be located at the center of the first hole 111. And the number of strips is not limited to the two shown. In other embodiments, the weakened portion may be a single linear structure, or may be three or more linear structures. When there are more than two linear structures, the linear structures may also be parallel to each other or intersect in an extended line.

Because the weak part of the high temperature resistant sheet 12 is located above the first hole 111, the weak part can be broken under the condition that high temperature and high pressure are generated in the battery, a channel for discharging the high temperature and high pressure in the battery to the outside is formed, and explosion and fire of the battery are prevented. That is to say, through the utility model discloses a high temperature resistant piece 12 can prevent that it from receiving the thermal runaway influence of other batteries and the chain reaction that leads to when guaranteeing the explosion-proof valve of a battery self and the normal performance of pressure release function originally of first hole 111. The safety and stability of the battery as a whole are improved.

As shown in fig. 2, 4 and 5, the high temperature resistant sheet 12 further includes a shielding portion 122 covering the first hole 111, two extending portions 124 bent and extending downward from the shielding portion 122 along both ends of the cover plate main body 11 in the longitudinal direction, and a main body portion 123 connected to the two extending portions 124 and extending in the longitudinal direction of the cover plate main body 11. The shielding portion 122 is attached to the protective film 13, and sandwiches the protective film 13 with the boss 112. Optionally, the distance between the shielding portion 122 and the protective film is 0.5mm to 1mm.

It can be understood that in other embodiments, the cover plate may not have the protective film 13, in which the shielding portion 122 covers the first hole, and the two extending portions 124 extend downward to avoid the side wall of the boss 112, so that the high temperature resistant sheet and the cover plate body have a higher installation matching degree.

Alternatively, as shown in fig. 2, the high temperature-resistant sheet is an integral member.

Further, as shown in fig. 1 and 2, the body portion 123 extends to the edge of the cover plate body 11 in the longitudinal direction, and the body portion 123 has a through hole 1231 through which the positive and negative posts penetrate. Therefore, the high temperature resistant sheet 12 is long enough to cover a large area of the cover plate body 11 and protect the cover plate body 11.

In other embodiments, the cover plate body 11 has a second hole 113 for the post to pass through, and the body 123 may also be located between the boss 112 and the second hole 113, i.e. the length of the body 123 is shorter and does not reach the positive post and the negative post.

Further, the thickness of the shielding portion 122 ranges from 0.2mm to 1mm, and the thickness of the main body portion 123 ranges from 0.1mm to 1mm.

Alternatively, as shown in fig. 2, 4, and 5, the thickness of the shielding portion 122 is smaller than or equal to the thickness of the body portion 123. Therefore, the main body 123 can separate the high-temperature substance from the cover plate 11, and the shielding part 122 can prevent the high-temperature substance from falling into the battery from the first hole 111, and the thickness of the shielding part 122 can be more suitable for the rupture of the battery during pressure relief.

Implementation details of the present embodiment are specifically described below, and the following description is provided only for the sake of understanding and is not necessary for implementing the present embodiment.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

It will be understood by those skilled in the art that the foregoing embodiments are specific examples of the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in its practical application.

Claims (13)

1. A cover plate, comprising:

the cover plate comprises a cover plate main body, a first hole is formed in the cover plate main body, and a boss surrounding the periphery of the first hole is arranged on the cover plate main body;

gao Wenpian, which is arranged on the top of the cover plate main body and extends along the length direction of the cover plate main body, and the high-temperature resistant sheet is provided with a weak part, and the weak part is at least partially positioned in the first hole along an orthographic projection perpendicular to the direction of the cover plate main body; the high-temperature resistant sheet is also provided with a shielding part covering the first hole and two extending parts which are bent and extend downwards from the shielding part along the two ends of the cover plate main body in the length direction.

2. The cap plate of claim 1, further comprising a body portion connected to the two extension portions, respectively, and extending in a length direction of the cap plate body.

3. The cover plate according to claim 1, wherein a protective film is disposed on the upper surface of the boss, and the distance between the shielding portion and the protective film is 0.5mm to 1mm.

4. The cover plate according to claim 1, wherein the upper surface of the boss is provided with a protective film, and the Gao Wenpian and the boss clamp the protective film.

5. The decking of claim 2, wherein the high temperature resistant sheet is a unitary member.

6. The cover plate according to claim 2, wherein the body portion extends to an edge of the cover plate body in a length direction thereof, and the body portion has a through hole.

7. The cover plate as claimed in claim 2, wherein the cover plate body has a second hole; the main body part is located between the boss and the second hole.

8. The cover sheet according to claim 2, wherein the thickness of the shade ranges from 0.2mm to 1mm; the thickness of the main body part ranges from 0.1mm to 1mm.

9. The cover sheet of claim 6, wherein the thickness of the curtain portion is less than or equal to the thickness of the main body portion.

10. The decking of claim 7, wherein the weakened sections are cracks or holes.

11. The decking of claim 2, wherein the weakened sections are in the form of a plurality of lines, at least two of which intersect or are elongate.

12. A battery, comprising:

the cover plate of any one of claims 1-11;

the cover plate is arranged at the opening and closes the opening;

the battery cell is arranged in the shell.

13. An electronic device comprising the battery according to claim 12.

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