CN220341439U

CN220341439U - Battery and battery device

Info

Publication number: CN220341439U
Application number: CN202321952590.9U
Authority: CN
Inventors: 苏春艳
Original assignee: China Innovation Aviation Technology Group Co ltd
Current assignee: China Innovation Aviation Technology Group Co ltd
Priority date: 2023-07-24
Filing date: 2023-07-24
Publication date: 2024-01-12
Anticipated expiration: 2033-07-24

Abstract

The present disclosure relates to the field of battery technology, and in particular, to a battery and a battery device, where the battery includes: the battery comprises a shell, an electric core and an explosion-proof valve, wherein an accommodating cavity is formed in the shell; the battery cell is arranged in the accommodating cavity; the explosion-proof valve comprises a connecting part and an explosion-proof part, wherein the connecting part is connected with the shell, an explosion-proof through hole communicated with the accommodating cavity is formed in the first surface of the shell, the explosion-proof part is connected with the connecting part, the explosion-proof part is concaved inwards towards one side close to the battery cell along the explosion-proof through hole, and a weak area is formed in the explosion-proof part. The explosion-proof valve indent sets up, can avoid explosion-proof valve occupation space more problem, has promoted space utilization.

Description

Battery and battery device

Technical Field

The disclosure relates to the technical field of batteries, and in particular relates to a battery and a battery device.

Background

Battery devices are often provided in electric vehicles for powering the electric vehicles. The battery device can comprise a plurality of batteries, and an explosion-proof valve is arranged on a shell of the batteries for ensuring the safety of the batteries and is opened to release pressure of the batteries after the batteries are out of control. In the related art, the explosion-proof valve tends to protrude from the surface of the housing. In the battery production and assembly process, the explosion-proof valve protruding out of the surface of the battery is easy to collide or be damaged by friction.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.

Disclosure of Invention

The present disclosure is directed to a battery and a battery device, and further to at least some extent protect an explosion-proof valve on the battery.

According to one aspect of the present disclosure, there is provided a battery including:

the battery cell comprises a shell, wherein an accommodating cavity is formed in the shell, a protruding structure far away from the battery cell is arranged on the first surface of the shell, and the protruding structure protrudes out of the first surface of the shell and has a size of 1.5mm-2mm;

the battery cell is arranged in the accommodating cavity;

the explosion-proof valve comprises a connecting part and an explosion-proof part, the connecting part is connected with the shell, an explosion-proof through hole communicated with the accommodating cavity is formed in the first surface of the shell, the explosion-proof part is connected with the connecting part, the explosion-proof part is concaved inwards towards one side close to the battery cell along the explosion-proof through hole, and a weak area is formed in the explosion-proof part;

the height of the explosion-proof valve is smaller than or equal to the height of the protruding structure, the height of the explosion-proof valve is the distance between one end of the explosion-proof valve, which is far away from the battery cell, and the first surface of the shell, and the height of the protruding structure is the distance between one end of the protruding structure, which is far away from the battery cell, and the first surface of the shell.

The embodiment of the disclosure provides a battery, which comprises a housin, electric core and explosion-proof valve, be provided with the holding chamber in the casing, be provided with the protruding structure of keeping away from the electric core on the first surface of casing, the holding intracavity is located to the electric core, the first surface of casing is provided with the explosion-proof hole with the holding chamber intercommunication, the explosion-proof valve includes connecting portion and explosion-proof portion, connecting portion and casing are connected, explosion-proof portion and connecting portion are connected, and explosion-proof portion is along explosion-proof through hole to the connecting portion be close to the one side indent of electric core, namely explosion-proof valve indent sets up, the explosion-proof valve protrusion that has avoided the explosion-proof valve to lead to in the casing surface is easily damaged the problem, the yield of battery has been promoted, the manufacturing cost of battery has been reduced, and explosion-proof valve indent sets up, can avoid the problem that explosion-proof valve occupation space is more, space utilization has been promoted. The height of explosion-proof valve is less than or equal to the height of protruding structure, utilizes protruding structure to provide explosion-proof space, and protruding structure has realized the structural protection of explosion-proof valve simultaneously, and protruding structure protrusion is 1.5mm-2mm in the size of the first surface of casing, and on the one hand, protruding structure height is more than or equal to 1.5mm, provides sufficient explosion-proof space, on the other hand, and protruding structure's height less than or equal to 2mm avoids protruding structure protruding size too big occupation battery device great space's problem.

According to another aspect of the present disclosure, there is provided a battery device including the above battery.

The battery device that this disclosed embodiment provided includes the battery, be provided with the holding chamber in the battery, be provided with the protruding structure of keeping away from the electric core on the first surface of casing, the electric core is located the holding intracavity, the first surface of casing is provided with the explosion-proof hole with the holding chamber intercommunication, explosion-proof valve includes connecting portion and explosion-proof portion, connecting portion and casing are connected, explosion-proof portion and connecting portion are connected, and explosion-proof portion is along explosion-proof through hole to the connecting portion be close to the one side indent of electric core, namely explosion-proof valve indent sets up, the explosion-proof valve protrusion is in the problem of casing surface and the explosion-proof valve that leads to is easily damaged, the yield of battery has been promoted, the manufacturing cost of battery has been reduced, and explosion-proof valve indent sets up, can avoid the problem that explosion-proof valve occupation space is more, space utilization has been promoted. The height of explosion-proof valve is less than or equal to the height of protruding structure, utilize protruding structure to provide explosion-proof space, protruding structure has realized the structural protection of explosion-proof valve simultaneously, protruding structure protrusion is 1.5mm-2mm in the size of the first surface of casing, on the one hand, protruding structure height is more than or equal to 1.5mm, provide sufficient explosion-proof space, on the other hand, protruding structure's height less than or equal to 2mm, avoid protruding structure protruding size too big occupation cell device great space's problem, promoted space utilization, and then promote cell device's energy density.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.

Fig. 1 is a schematic view of a battery according to an exemplary embodiment of the present disclosure;

fig. 2 is a schematic view of another battery according to an exemplary embodiment of the present disclosure;

FIG. 3 is an enlarged partial schematic view of a battery provided in an exemplary embodiment of the present disclosure;

fig. 4 is a schematic structural view of an explosion-proof valve according to an exemplary embodiment of the present disclosure;

fig. 5 is a schematic partial cross-sectional view of a battery provided in an exemplary embodiment of the present disclosure.

Tag name

10. A housing; 101. a first panel; 102. a second panel; 103. a surrounding frame; 11. a bump structure; 20. an explosion-proof valve; 201. a weakened area; 21. a connection part; 22. an explosion-proof section; 23. a transition section; 30. a battery cell; 40. a protective sheet; 50. an insulating support.

Detailed Description

The technical solutions in the exemplary embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the exemplary embodiments of the present disclosure. The example embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and it is therefore to be understood that various modifications and changes may be made to the example embodiments without departing from the scope of the present disclosure.

In the description of the present disclosure, 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 unless explicitly specified or limited otherwise; the term "plurality" refers to two or more than two; the term "and/or" includes any and all combinations of one or more of the associated listed items. In particular, references to "the/the" object or "an" object are likewise intended to mean one of a possible plurality of such objects.

Unless specified or indicated otherwise, the terms "connected," "fixed," and the like are to be construed broadly and are, for example, capable of being fixedly connected, detachably connected, or integrally connected, electrically connected, or signally connected; "coupled" may be directly coupled or indirectly coupled through intermediaries. The specific meaning of the terms in the present disclosure may be understood by those skilled in the art according to the specific circumstances.

Further, in the description of the present disclosure, it should be understood that the terms "upper", "lower", "inner", "outer", and the like, as described in the example embodiments of the present disclosure, are described with the angles shown in the drawings, and should not be construed as limiting the example embodiments of the present disclosure. It will also be understood that in the context of an element or feature being connected to another element(s) "upper," "lower," or "inner," "outer," it can be directly connected to the other element(s) "upper," "lower," or "inner," "outer," or indirectly connected to the other element(s) "upper," "lower," or "inner," "outer" via intervening elements.

The exemplary embodiment of the present disclosure provides a battery, as shown in fig. 1, 2, 3 and 4, the battery includes a housing 10, a battery cell 30 and an explosion-proof valve 20, the housing 10 has a receiving cavity therein, a protruding structure 11 far from the battery cell 30 is disposed on a first surface of the housing 10, and a dimension of the protruding structure 11 protruding from the first surface of the housing 10 is 1.5mm-2mm; the battery cell 30 is arranged in the accommodating cavity; the explosion-proof valve 20 comprises a connecting part 21 and an explosion-proof part 22, the connecting part 21 is connected with the shell 10, an explosion-proof through hole communicated with the accommodating cavity is formed in the first surface of the shell 10, the explosion-proof part 22 is connected with the connecting part 21, the explosion-proof part 22 is concave inwards towards one side, close to the battery cell 30, along the explosion-proof through hole, and the explosion-proof part 22 is provided with a weak area 201. The height of the explosion-proof valve 20 is smaller than or equal to the height of the protruding structure 11, the height of the explosion-proof valve 20 is the distance between one end of the explosion-proof valve 20 (the connecting portion 21) away from the battery cell 30 and the first surface of the housing 10, and the height of the protruding structure 11 is the distance between one end of the protruding structure 11 away from the battery cell 30 and the first surface of the housing 10.

The battery provided by the embodiment of the disclosure comprises a housing 10, a battery cell 30 and an explosion-proof valve 20, wherein an accommodating cavity is formed in the housing 10, a protruding structure 11 far away from the battery cell 30 is arranged on the first surface of the housing 10, the battery cell 30 is arranged in the accommodating cavity, an explosion-proof hole communicated with the accommodating cavity is formed in the first surface of the housing 10, the explosion-proof valve 20 comprises a connecting part 21 and an explosion-proof part 22, the connecting part 21 is connected with the housing 10, the explosion-proof part 22 is connected with the connecting part 21, and the explosion-proof part 22 is concaved inwards towards one side of the connecting part 21, close to the battery cell 30, along the explosion-proof through hole, namely, the explosion-proof valve 20 is concaved inwards, so that the problem that the explosion-proof valve 20 is easily damaged due to the fact that the explosion-proof valve 20 protrudes out of the surface of the housing 10 is avoided, the yield of the battery is improved, the production cost of the battery is reduced, the explosion-proof valve 20 is concaved inwards, the problem that the space occupation of the explosion-proof valve 20 is more can be avoided, and the space utilization rate is improved. The height of explosion-proof valve 20 is less than or equal to the height of protruding structure 11, utilizes protruding structure 11 to provide explosion-proof space, and protruding structure 11 has realized the structural protection of explosion-proof valve 20 simultaneously, and protruding structure 11 protrusion is 1.5mm-2mm in the size of the first surface of casing, on the one hand, protruding structure 11 height is more than or equal to 1.5mm, has provided sufficient explosion-proof space, on the other hand, and the height of protruding structure 11 is less than or equal to 2mm, avoids protruding structure 11 protruding size too big occupation battery device great space's problem.

Further, as shown in fig. 5, the battery provided in the embodiment of the disclosure may further include a protection sheet 40 and an insulating bracket 50, where the protection sheet 40 is disposed on a side of the explosion-proof valve 20 away from the battery cell 30, and the protection sheet 40 is used for blocking a recess formed by the indent of the explosion-proof valve 20 so as to protect the explosion-proof valve 20. An insulating holder 50 is provided within the housing 10, and the insulating holder 50 is located at an end of the battery cell 30, with a projection of the insulating holder 50 on the first surface of the housing 10 covering the explosion-proof section 22.

The following will describe each part of the battery provided in the embodiments of the present disclosure in detail:

the housing 10 serves to form the outer contour of the battery and to protect the components within the housing 10. The housing 10 may include a first panel 101, a second panel 102, and a surrounding frame 103, where the first panel 101 and the second panel 102 are disposed opposite to each other, the surrounding frame 103 is disposed between the first panel 101 and the second panel 102, and the surrounding frame 103 is connected to the first panel 101 and the second panel 102, respectively. The explosion-proof through hole is formed in the enclosure frame 103, for example, the enclosure frame 103 may include a plurality of side panels, and the explosion-proof through hole is formed in the side panels.

By way of example, the battery in embodiments of the present disclosure may be of a cuboid or approximately cuboid configuration. On the other hand, the housing 10 has a rectangular or nearly rectangular structure. The first panel 101 and the second panel 102 are in rectangular plate-shaped structures, and the enclosure frame 103 comprises four side panels which are connected end to end in sequence to form a rectangular frame.

The area of the first panel 101 is larger than that of the side panel, and the area of the second panel 102 is larger than that of the side panel, that is, the first panel 101 and the second panel 102 form two large faces of the battery, the side panel forms a small face of the battery, and the explosion-proof valve 20 is arranged on the small face.

In some embodiments, the first panel 101 and the enclosure frame 103 are integrally formed, for example, the first panel 101 and the enclosure frame 103 are integrally formed by stamping, the second panel 102 and the enclosure frame 103 are split-type, and the second panel 102 and the enclosure frame 103 are welded. Of course, in practical applications, the first panel 101 and the enclosure frame 103 may be formed in a split structure, and the second panel 102 and the enclosure frame 103 may be connected by riveting or other manners, which is not limited in this disclosure.

When the second panel 102 and the side frame are welded, in order to facilitate connection between the second panel 102 and the side frame, a flange protruding from the surface of the side frame may be disposed on the second panel 102 and the side frame, the area of the second panel 102 is larger than that of the first panel 101, and the projection of the flange on the second panel 102 coincides with the edge of the second panel 102. The flange is welded to the edge of the second panel 102 during welding, which is convenient for welding and can prevent the battery cell 30 from being damaged by high temperature during welding. Of course, in practical applications, the second panel 102 and the side frame may not be provided with flanges, which is not limited in this disclosure.

The battery cell 30 includes a battery cell main body and a tab, and the tab is disposed at an end of the battery cell main body. For example, tabs may be respectively disposed at both ends of the battery cell main body in the length direction. One end of the battery cell main body is provided with a first tab, and the other end of the battery cell main body is provided with a second tab. One of the first tab and the second tab is a positive tab, and the other one of the first tab and the second tab is a negative tab.

It should be noted that, the battery core main body includes more than two pole pieces, and the tab includes more than two monolithic tabs, and the monolithic tab extends out from the pole piece rather than corresponding respectively, and the width of monolithic tab is less than the width of pole piece, thereby a plurality of monolithic tabs stack mutually and form the tab to be connected with the utmost point post, wherein, the tab can be with utmost point post welding. Wherein the single tab is made of a metal foil having good electrical and thermal conductivity, such as aluminum, copper, or nickel.

The cells 30 in the disclosed embodiments may be coiled cells or laminated cells. When the battery cell 30 is a laminated battery cell, the battery cell 30 has a first pole piece, a second pole piece opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form a laminated battery cell. When the battery cell 30 is a winding type battery cell, the winding type battery cell is obtained by winding a first pole piece, a second pole piece opposite to the first pole piece and a diaphragm sheet arranged between the first pole piece and the second pole piece.

The battery cell main body is in a cuboid or approximately cuboid structure, and the battery cell main body is provided with two large surfaces which are oppositely arranged and a plurality of small surfaces which are positioned between the two large surfaces, and the area of the large surface of the battery cell main body is larger than that of the small surface of the battery cell main body. The electrode lugs are led out from the end part of the battery cell main body along the first direction, and the spreading direction of the electrode lugs is consistent with the extending direction of the large surface of the battery cell main body. The insulating support 50 is arranged at one end of the battery cell main body where the electrode lug is arranged, and the electrode lug is paved on the insulating support 50.

The insulating support 50 is arranged in the shell 10, the insulating support 50 is used for converging the lugs on one hand, and the insulating support 50 is used for supporting the battery shell 10 on the other hand, so that the problem that the shell 10 is easy to deform due to small thickness of the shell 10 is solved. The insulating support 50 may include a frame body, on which a receiving portion is disposed, and the tab is bundled in the receiving portion. For example, the accommodating portion may be a groove provided on the frame body.

For example, the battery may include a first insulating holder and a second insulating holder, which are provided at both ends of the battery cell 30, respectively. On this basis, can be provided with first explosion-proof through-hole and second explosion-proof through-hole on the casing 10, first explosion-proof through-hole and second explosion-proof through-hole are located the both ends of casing 10 respectively, and first explosion-proof through-hole department is provided with first explosion-proof valve, and second explosion-proof through-hole department is provided with the second explosion-proof valve.

The explosion-proof valve 20 comprises a connecting part 21 and an explosion-proof part 22, the connecting part 21 is connected with the shell 10, an explosion-proof through hole communicated with the accommodating cavity is formed in the first surface of the shell 10, the explosion-proof part 22 is connected with the connecting part 21, the explosion-proof part 22 is concave inwards towards one side, close to the battery cell 30, of the connecting part 21 along the explosion-proof through hole, and the explosion-proof part 22 is provided with a weak area 201.

The connecting portion 21 is disposed on a side of the housing 10 away from the battery cell 30, and the connecting portion 21 at least partially surrounds the explosion-proof through hole. The connection portion 21 may have a ring-shaped structure, and the connection portion 21 surrounds the explosion-proof through hole. For example, when the explosion-proof through hole is a circular hole, the connecting portion 21 is a circular ring; or when the explosion-proof through hole is a rectangular hole, the connection portion 21 is a rectangular ring. The connection portion 21 may be welded to the housing 10, and of course, in practical applications, the connection portion 21 and the housing 10 may be connected by bonding or riveting.

The connection portion 21 is disposed on a side of the housing 10 away from the battery cell 30, that is, the connection portion 21 protrudes from an outer surface of the housing 10. The connection portion 21 may be welded to the outer surface of the case 10. For example, the connection portion 21 and the case 10 are welded by laser welding, resistance welding, friction welding, or the like. The connecting portion 21 is arranged on the outer surface of the shell 10, so that the problem that the space for changing the angle of welding laser is insufficient and the space for accommodating a welding tool is insufficient due to the fact that the explosion-proof through hole is too close to the first panel 101 when the inner side of the shell 10 is welded is solved, the explosion-proof valve 20 is welded from the outer surface of the shell 10, and control of a welding process and improvement of a welding effect are facilitated.

The protruding structure 11 is a post or flange provided on the first surface (side panel) of the housing 10. The flange is a structure for welding the peripheral frame 103 and the second panel 102. When the boss structure 11 is a flange, the explosion proof valve 20 and the post are not arranged coplanar. For example, the explosion proof valve 20 is provided on a side panel of the housing, and the pole is provided on the first surface of the housing.

The posts are provided on the side panels and are connected to the battery cells 30, the posts serving as electrode terminals of the battery. The height of the explosion-proof valve 20 is smaller than that of the protruding structure 11, the space formed by the protruding structure 11 on the surface of the shell 10 is used for accommodating the explosion-proof valve 20, the space for accommodating the explosion-proof valve 20 specially on a battery is avoided, and the space utilization rate of the battery is improved.

Optionally, a thinned area surrounding the explosion-proof through hole is provided on the first surface of the housing 10, and the connecting portion 21 is provided in the thinned area. That is, the circumference of the explosion-proof through hole is provided with a recess lower than the first surface of the housing 10, and the connection portion 21 is at least distributed and embedded in the recess. By fitting the connection portion 21 in the thinned region on the housing 10, the space occupied by the connection portion 21 can be reduced.

The thickness of the shell 10 is H1, the protruding structure 11 protrudes from the shell 10 by a dimension H2, and the ratio of H2 to H1 is in the range of 0.125-5. For example, the ratio of H2 to H1 is 0.125, 0.5, 1, 3 or 5, etc. On the one hand, the ratio of H2 to H1 is more than or equal to 0.125, so that the problem that the explosion-proof valve is not enough in explosion space and is easy to be damaged greatly due to the fact that the ratio of the H2 to the H1 is too small is avoided; on the other hand, the ratio of H2 to H1 is less than or equal to 5, so that the problem that the explosion-proof valve 20 is abnormally exploded due to the fact that the raised structure 11 is easy to deform caused by the overlarge ratio of H2 to H1 and the structural stability of the explosion-proof valve 20 is difficult to ensure is avoided.

The explosion-proof part 22 is concave in the explosion-proof through hole, and the explosion-proof part 22 is provided with a weak area 201, and the strength of the weak area 201 is smaller than that of the surrounding area, and when the internal thermal runaway of the battery occurs, the weak area 201 bursts to release the pressure of the battery. The weakened area 201 may be a score provided on the explosion proof section 22, i.e. the weakened area 201 has a thickness which is smaller than the thickness of the surrounding area.

The ratio of the area of the connection portion 21 to the area of the explosion-proof portion 22 ranges from 0.07 to 0.6. For example, the ratio of the area of the connection portion 21 to the area of the explosion-proof portion 22 is 0.07, 0.1, 0.5, 0.6, or the like. On the one hand, the area ratio of the connecting part 21 to the explosion-proof part 22 is larger than 0.07, so that the area of the connecting part 21 is effectively ensured, the connection stability of the explosion-proof valve 20 and the shell 10 is improved, and on the other hand, the area ratio of the connecting part 21 to the explosion-proof part 22 is smaller than 0.6, the overlarge occupied ratio of the connecting part 21 is avoided, and the sufficient pressure relief area of the explosion-proof part 22 is ensured.

When the housing 10 includes the first panel 101, the second panel 102 and the enclosure 103, the explosion-proof through hole is provided in the enclosure 103. The first panel 101 and the enclosure 103 are of an integrated structure, and the distance between the explosion-proof through hole and the first panel 101 is greater than or equal to 0.2mm. For example, the distance between the explosion proof valve 20 and the first panel 101 is 0.2mm, 1mm, 3mm, or the like. By setting the distance between the explosion-proof through hole and the first panel 101 to be 0.2mm or more, the problem of insufficient space for changing the angle of the welding laser when the explosion-proof through hole is formed in the side frame to weld the explosion-proof valve 20 is solved, and the control of the welding process and the improvement of the welding effect are facilitated.

Further, the explosion-proof valve 20 provided in the embodiment of the present disclosure further includes a transition portion 23, the transition portion 23 is connected to the connection portion 21 and the explosion-proof portion 22, respectively, and the transition portion 23 extends along a sidewall of the explosion-proof through hole. The transition portion 23 extends along the side wall of the explosion-proof through hole, namely, the transition portion 23 is abutted to the explosion-proof through hole, the explosion-proof valve 20 is positioned through the side wall of the explosion-proof through hole, the explosion-proof valve 20 is convenient to install and position, and the production efficiency of a battery is improved. And the transition portion 23 is supported by the explosion-proof through hole, improving the structural stability of the explosion-proof valve 20.

The distance between the explosion proof section 22 and the first surface of the housing 10 is 0.5mm-2mm, i.e. the sinking dimension of the explosion proof section 22 is 0.5mm-2mm. For example, the sinking dimension of the explosion-proof portion 22 is 0.5mm, 1mm, 2mm, or the like. On the one hand, the explosion-proof part 22 is ensured to sink below the side panel, and on the other hand, the explosion-proof part 22 is prevented from occupying excessive space inside the battery.

The explosion proof valve 20 and the insulating holder 50 are disposed opposite to each other, that is, a projection of the insulating holder 50 on the first surface of the housing 10 covers the explosion proof portion 22. A liquid guiding part may be provided on the insulating support 50, and the liquid guiding part communicates with the inside of the case 10 and the explosion-proof valve 20, so that the explosion-proof valve 20 can decompress the battery when the battery is thermally out of control.

The protection sheet 40 is arranged on one side of the explosion-proof valve 20 away from the battery cell 30, the height of the protection sheet 40 is smaller than that of the protruding structure 11, the height difference between the protection sheet 40 and the protruding structure 11 is larger than a, and the height of the protection sheet 40 is the distance between one surface of the protection sheet 40 away from the battery cell 30 and the first surface of the shell 10. The protective sheet 40 is used to protect the explosion proof valve 20 from metal debris, moisture, or other contaminants damaging the explosion proof valve 20.

The protective sheet 40 is bonded to the side of the connection portion 21 remote from the battery cell 30. The ratio of the area where the protective sheet 40 and the connecting portion 21 are connected to the total area of the protective sheet is 5% to 30%. For example, the ratio of the area of the region where the protective sheet 40 and the connecting portion 21 are connected to the total area of the protective sheet is 5%, 8%, 20%, 30%, or the like. On the one hand, the ratio of the area of the connecting part 21 to the total area of the protective sheet is more than 5%, so that the connection strength of the protective sheet 40 is ensured, and on the other hand, the ratio of the area of the connecting part 21 to the total area of the protective sheet is less than 30%, so that the problem of overlarge area of the connecting part 21 caused by overlarge area of the protective sheet 40 is avoided.

The distance between the explosion proof section 22 and the shield 40 is 0.5mm-2mm. On the one hand, the distance between the explosion-proof part 22 and the protection sheet 40 is greater than or equal to 0.5mm, the problem that the strength of the explosion-proof part 22 is increased by the protection sheet 40 due to the fact that the distance between the protection sheet 40 and the explosion-proof part 22 is too small is avoided, the explosion of the explosion-proof valve 20 is facilitated when the battery is in thermal runaway, on the other hand, the distance between the explosion-proof part 22 and the protection sheet 40 is less than or equal to 2mm, the situation that the explosion-proof part 22 occupies too much space in the battery is avoided, and the space utilization rate of the battery is improved.

Exemplary embodiments of the present disclosure also provide a battery device including a battery.

The battery comprises a shell 10, a battery core 30 and an explosion-proof valve 20, wherein an accommodating cavity is formed in the shell 10; the battery cell 30 is arranged in the accommodating cavity; the explosion-proof valve 20 comprises a connecting part 21 and an explosion-proof part 22, the connecting part 21 is connected with the shell 10, an explosion-proof through hole communicated with the accommodating cavity is formed in the first surface of the shell 10, the explosion-proof part 22 is connected with the connecting part 21, the explosion-proof part 22 is concave inwards towards one side, close to the battery cell 30, along the explosion-proof through hole, and the explosion-proof part 22 is provided with a weak area 201.

The battery device may be a battery pack, a battery module, a battery pack, or the like. The battery pack includes a plurality of sequentially arranged cells, and the large surfaces of adjacent cells are opposite when the plurality of cells are arranged. The battery module may include a battery pack and end plates (end insulating plates) disposed at ends of the battery pack in a battery arrangement direction, the end plates being provided at both ends of the battery pack, respectively.

The battery pack may include a housing including a base plate and a structural beam connected to the base plate to form one or more battery compartments, and a plurality of batteries disposed in the battery compartments. The bottom plate is used for supporting the battery, and the structural beam is used for limiting the battery.

A plurality of stacked cells may be provided in the cell compartment, the large surfaces of adjacent cells being opposed when stacked, and the small surfaces of the cells being opposed to the bottom plate in the length direction. The plurality of cells in the battery compartment may be electrically connected (in series or parallel) by a bus bar, which is provided on the sides of the plurality of cells, and the bus bar is welded to the poles of the cells.

The battery device provided by the embodiment of the disclosure includes a battery, a containing cavity is arranged in a shell 10 in the battery, a battery core 30 is arranged in the containing cavity, an explosion-proof hole communicated with the containing cavity is formed in a first surface of the shell 10, an explosion-proof valve 20 comprises a connecting part 21 and an explosion-proof part 22, the connecting part 21 is connected with the shell 10, the explosion-proof part 22 is connected with the connecting part 21 along the explosion-proof through hole, and the explosion-proof part 22 is concaved inwards towards one side, close to the battery core 30, of the connecting part 21, namely, the explosion-proof valve 20 is concaved, so that the problem that the explosion-proof valve 20 is easily damaged due to the fact that the explosion-proof valve 20 protrudes out of the surface of the shell 10 is avoided, the yield of the battery is improved, the production cost of the battery is reduced, further, the problem that the explosion-proof valve 20 is concaved inwards, the occupation space utilization rate is improved, and the energy density of the battery device is further improved. The height of explosion-proof valve 20 is less than or equal to the height of protruding structure 11, utilizes protruding structure 11 to provide explosion-proof space, and protruding structure 11 has realized the structural protection of explosion-proof valve 20 simultaneously, and protruding structure 11 protrusion is 1.5mm-2mm in the size of the first surface of casing, on the one hand, protruding structure 11 height is more than or equal to 1.5mm, has provided sufficient explosion-proof space, on the other hand, and the height of protruding structure 11 is less than or equal to 2mm, avoids protruding structure 11 protruding size too big occupation battery device great space's problem.

The battery device provided by the embodiment of the disclosure can be applied to an electric vehicle, and when the battery device is used for the electric vehicle, the battery device can be a battery pack which is installed on the electric vehicle and provides energy for the electric vehicle.

In practice, the battery pack may be mounted to the frame of an electric vehicle. The battery pack can be fixedly connected with the frame. Or the battery pack can be a modularized battery pack which can be detachably connected to the vehicle body, so that the battery pack is convenient to replace.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

Claims

1. A battery, the battery comprising:

the battery pack comprises a shell, wherein an accommodating cavity is formed in the shell, a protruding structure far away from a battery cell is arranged on the first surface of the shell, and the protruding structure protrudes from the first surface of the shell, and the size of the protruding structure is 1.5mm-2mm;

the battery cell is arranged in the accommodating cavity;

2. The battery of claim 1, wherein the protruding structure is a post or flange provided on the first surface of the housing.

3. The battery of claim 1, wherein the battery further comprises:

the protection piece, the protection piece is located the explosion-proof valve is kept away from one side of electric core, the height of protection piece is less than protruding structure's height, and the protection piece with protruding structure's difference in height is greater than 0.2mm, the height of protection piece is the protection piece is kept away from the one side of electric core with the distance of casing first surface.

4. The battery of claim 3, wherein the protective sheet and the side of the connecting portion remote from the cell are bonded.

5. The battery of claim 4, wherein the ratio of the area of the protection sheet where the connection portion is connected to the total area of the protection sheet is 5% to 30%.

6. The battery of claim 3, wherein a distance between the explosion proof portion and the protective sheet is 0.5mm to 2mm.

7. The battery of claim 1, wherein the connection is provided on a side of the housing remote from the cell, and the connection at least partially surrounds the explosion-proof through hole.

8. The battery of claim 7, wherein a thinned region surrounding the explosion-proof through hole is provided on the first surface of the case, and the connection portion is provided in the thinned region.

9. The battery of claim 7, wherein the ratio of the area of the connection portion to the area of the explosion-proof portion ranges from 0.07 to 0.6.

10. The battery of claim 1, wherein the housing comprises:

a first panel:

the second panel is arranged opposite to the first panel;

enclose the frame, enclose the frame and locate between the first panel with the second panel, and enclose the frame respectively with first panel reaches the second panel is connected, explosion-proof through-hole is located enclose the frame.

11. The battery of claim 10, wherein the first panel and the peripheral frame are of an integrally formed structure, and a distance between the explosion-proof through hole and the first panel is 0.2mm or more.

12. The battery of claim 10 wherein the enclosure comprises a plurality of end-to-end side panels, the first panel having an area greater than the area of the side panels and the second panel having an area greater than the area of the side panels.

13. The battery of claim 1, wherein the explosion-proof valve further comprises:

the transition part is respectively connected with the connecting part and the explosion-proof part, and extends along the side wall of the explosion-proof through hole.

14. The battery of claim 1, wherein the distance between the explosion proof portion and the first surface of the case is 0.5mm to 2mm.

15. The battery of claim 1, wherein the battery further comprises:

the insulating support is arranged in the shell, and is positioned at the end part of the battery cell, and the explosion-proof valve and the insulating support are oppositely arranged.

16. The battery of claim 1, wherein the thickness of the housing is H1, the protruding structures protrude from the housing by a dimension H2, and the ratio of H2 to H1 ranges from 0.125 to 5.

17. A battery device comprising a battery according to any one of claims 1-16.