CN219696500U - Battery cell and battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries, in particular to a battery cell and a battery device, wherein the battery cell comprises a battery cell main body, a pole lug and a first reinforcement, the battery cell main body is provided with two oppositely arranged first surfaces and a plurality of second surfaces positioned between the two first surfaces, the area of the first surfaces is larger than that of the second surfaces, the second surfaces comprise connected end surfaces and side surfaces, the battery cell main body comprises a plurality of layers of sequentially folded diaphragms, pole pieces are arranged between the end diaphragms and the adjacent diaphragms, the end diaphragms are diaphragms of the end parts along the arrangement direction of the diaphragms in the plurality of layers of diaphragms, and one surface of the end part diaphragm, which is far away from the pole pieces, forms one first surface of the battery cell main body; the electrode lugs extend to the end face of the battery cell main body; the first reinforcement is connected with at least one second surface of the battery cell main body, and the distance between the first reinforcement and the end face is less than or equal to 15mm. The first reinforcement is used for limiting the diaphragm in the battery cell main body, so that the diaphragm is prevented from being folded, and the failure rate of the battery device is reduced.

Description

Battery cell and battery device

Technical Field

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

Background

Battery devices are often provided in electric vehicles for powering the electric vehicles. The battery device comprises a battery, and an electric core is arranged in the battery. The battery cell can be a laminated battery cell, and the battery cell comprises a diaphragm, a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece are arranged on two sides of the diaphragm. The membrane is easy to turn over in the electric core, and then the risk that causes the battery to have the trouble is great.

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 purpose of this disclosure is to provide a electric core and battery device, and then realized spacing to the electric core middle membrane.

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

the battery cell comprises a battery cell body, wherein the battery cell body is provided with two oppositely arranged first surfaces and a plurality of second surfaces positioned between the two first surfaces, the area of the first surfaces is larger than that of the second surfaces, and the plurality of second surfaces comprise connected end surfaces and side surfaces.

The battery cell main body comprises a plurality of layers of sequentially folded diaphragms, a pole piece is arranged between an end diaphragm and an adjacent diaphragm, the end diaphragm is a diaphragm at the end part along the arrangement direction of the diaphragms in the plurality of layers of diaphragms, and one surface of the end diaphragm, which is far away from the pole piece, forms a first surface of the battery cell main body;

the electrode lug extends to the end face of the battery cell main body to be out;

the first reinforcement is connected with at least one second surface and at least one first surface of the battery cell main body, and the distance between the first reinforcement and the end face is less than or equal to 15mm.

The electric core that this disclosed embodiment provided includes electric core main part, utmost point ear and first reinforcement, electric core main part has terminal surface and the side that meets, the utmost point ear extends out from the terminal surface of electric core main part, at least one second surface and at least one first surface of electric core main part are connected to first reinforcement, it is spacing to the diaphragm in the electric core main part to have realized through first reinforcement, avoid the diaphragm to turn over, the fault rate of battery device has been reduced, and first reinforcement is located the tip that the side is close to the terminal surface, the distance of first reinforcement and terminal surface is less than or equal to 15mm, the protection to electric core main part tip has been realized, the problem that the fillet interference on the battery casing after having avoided electric core main part inflation, lead to electric core main part material leakage foil.

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

The battery device that this disclosed embodiment provided includes the electric core, and the electric core main part has terminal surface and the side that meets in the electric core, and the tab extends out from the terminal surface of electric core main part, and the side of electric core main part is located to first reinforcement, and first reinforcement connects side and at least one first surface, has realized turning over the spacing diaphragm of avoiding of diaphragm in the electric core main part through first reinforcement, has reduced battery device's fault rate to first reinforcement is located the tip that the side is close to the terminal surface, and the distance of first reinforcement and terminal surface is less than or equal to 15mm, has realized the protection to electric core main part tip, has avoided the fillet interference on electric core main part inflation back and the battery case, leads to electric core main part to falling the problem of material leakage foil, has promoted battery device's quality.

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 structural diagram of a battery cell according to an exemplary embodiment of the present disclosure;

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

fig. 3 is a schematic structural view of a single battery according to an exemplary embodiment of the present disclosure;

fig. 4 is a schematic structural view of a battery pack according to an exemplary embodiment of the present disclosure.

Reference numerals

10. A battery cell; 101. a first surface; 102. a side surface; 103. an end face; 11. a cell body; 12. a first reinforcement; 121. a main body portion; 122. a first connection portion; 123. a second connecting portion; 13. a tab; 14. a second reinforcement; 100. a single battery; 200. a case; 210. a housing; 211. a case main body; 212. a cover plate; 201. and (3) a structural beam.

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 first provides a battery cell 10, as shown in fig. 1, the battery cell 10 includes a battery cell main body 11, a tab 13, and a first reinforcement member 12, the battery cell main body 11 has two oppositely disposed first surfaces 101 and a plurality of second surfaces located between the two first surfaces 101, the area of the first surfaces 101 is larger than the area of the second surfaces, and the plurality of second surfaces include an end face 103 and a side face 102 which are connected; the battery cell main body 11 comprises a plurality of layers of sequentially folded diaphragms, a pole piece is arranged between an end diaphragm and an adjacent diaphragm, the end diaphragm is an end diaphragm along the arrangement direction of the diaphragms in the plurality of layers of diaphragms, and one surface of the end diaphragm, which is far away from the pole piece, forms a first surface 101 of the battery cell main body 11; the tab 13 extends from the end face 103 of the cell body 11. The first reinforcement member 12 connects at least one second surface and at least one first surface 101 of the cell body 11, and the first reinforcement member 12 is at a distance of 15mm or less from the end face 103.

The battery cell 10 provided by the embodiment of the disclosure includes a battery cell main body 11, a tab 13 and a first reinforcement 12, the battery cell main body 11 is provided with an end face 103 and a side face 102 which are connected, the tab 13 extends from the end face of the battery cell main body 11, the first reinforcement 12 is connected with at least one second surface and at least one first surface 101 of the battery cell main body 11, the spacing of a diaphragm in the battery cell main body 11 is realized through the first reinforcement 12, the diaphragm is prevented from being folded, the failure rate of a battery device is reduced, the distance between the first reinforcement 12 and the end face 103 is less than or equal to 15mm, the protection of the end part of the battery cell main body 11 is realized, the problem that the battery cell main body 11 is prevented from being dropped and leaking foil due to the rounded corner interference on the battery cell casing 210 after the expansion of the battery cell main body 10 is avoided.

Further, the cell 10 provided in the embodiments of the present disclosure may further include at least one second reinforcement member 14, where the second reinforcement member 14 is disposed on the side 102 of the cell body 11, and the second reinforcement member 14 and the first reinforcement member 12 are disposed at intervals.

The following will describe each part of the battery cell 10 provided in the embodiment of the present disclosure in detail:

the battery cell 10 provided in the embodiment of the present disclosure is a laminated battery cell 10, and the battery cell main body 11 has a cuboid or approximately cuboid structure. The cell body 11 includes two oppositely disposed first surfaces 101 and four second surfaces located between the two first surfaces 101, the first surfaces 101 having an area larger than that of the second surfaces, the four second surfaces including end faces 103 and side faces 102 that meet. That is, the second surface comprises two oppositely disposed end faces 103 and two oppositely disposed side faces 102.

The battery cell main body 11 comprises a plurality of layers of sequentially folded diaphragms and pole pieces, the plurality of layers of diaphragms can be arranged in a Z-shaped folding manner, and the pole pieces are arranged between the adjacent diaphragms. The end diaphragm is a diaphragm at the end part along the arrangement direction of the diaphragms in the multi-layer diaphragm, and one surface of the end diaphragm, which is far away from the pole piece, forms one first surface of the battery cell main body. That is, the pole piece is under the end diaphragm, and the ending diaphragm is not wound around the battery cell in the manufacturing process of the battery cell. On this basis, if the diaphragm is folded, the pole piece can be exposed, so that the pole piece is easy to short-circuit the battery shell.

For example, the battery cell main body 11 may include a first pole piece and a second pole piece, where the separator is folded to form a separator in a multi-layer arrangement, and the first pole piece and the second pole piece are respectively disposed on two sides of the separator. For example, the first pole piece may be a positive pole piece and the second pole piece may be a negative pole piece.

In a possible embodiment, the length of the side 102 of the cell body 11 is greater than the length of the end 103 of the cell body 11. That is, the tab 13 is provided on the short surface of the cell main body 11. Of course, in practical applications, the length of the side surface 102 of the battery cell body 11 may also be smaller than the length of the end surface 103 of the battery cell body 11, which is not limited in the embodiments of the present disclosure.

The multiple layers of separator, the first pole piece and the second pole piece in the cell body 11 may be stacked along the thickness direction of the cell 10, and the thickness direction of the cell 10 is perpendicular to the first surface 101 of the cell body 11. The side surface 102 and the end surface 103 of the cell body 11 are formed in a multilayer structure.

The tab 13 is disposed on the end face 103 of the battery core main body 11, and the tab 13 and the pole piece can be in an integral structure. For example, the tab 13 is a portion of the pole piece extending out of the end face 103, a first tab extends out of the first pole piece, a plurality of first tabs form a first tab, a second tab extends out of the second pole piece, and a plurality of second tabs form a second tab. The first tab extends from a side of the first pole piece near the first end face of the battery cell main body 11, and the second tab extends from a side of the second pole piece near the second end face of the battery cell main body 11.

The pole piece comprises a conductive layer and active substance layers coated on two sides of the conductive layer, the conductive layer forms a current collector, the active substance layers form an electrode coating, and the electrode coating is coated on the surface of the current collector. In practical application, electrode powder can be mixed into coating liquid, the coating liquid is coated on a current collector, and then the electrode plate is formed through processes such as a pair roller and a cutting die.

Optionally, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, the current collector of the positive pole piece is an aluminum current collector, and the surface of the aluminum current collector is coated with a positive electrode material to form the positive pole piece. The current collector of the negative electrode plate is a copper current collector, and a negative electrode material is coated on the copper current collector to form the negative electrode plate. The thickness of the aluminum current collector is greater than the thickness of the copper current collector.

The first reinforcement member 12 connects at least one second surface and at least one first surface 101 of the cell body 11, and the first reinforcement member 12 is at a distance of 15mm or less from the end face 103. For example, the distance between the first reinforcing member 12 and the end face 103 may be 0, 1mm, 2mm, 5mm, 8mm, 10mm, 15mm, or the like.

The first reinforcement member 12 includes a main body portion 121 and a first connecting portion 122, the main body portion 121 being connected to the side 102 of the cell body 11; the first connection part 122 is connected with the body part 121, and the first connection part 122 extends to one first surface 101 of the cell body 11, and the first connection part 122 is connected with the first surface 101 of the cell body 11.

The dimension of the body 121 along the thickness direction of the cell body 11 may be the same as the thickness of the cell body 11, or the dimension of the body 121 along the thickness direction of the cell body 11 may be smaller than the thickness of the cell body 11. That is, the body portion 121 may extend from one first surface 101 to the other first surface 101 of the cell body 11, or the body portion 121 may extend from one first surface 101 to a side 102 middle region of the cell body 11.

Alternatively, as shown in fig. 2, the end of the first reinforcement member 12 facing the end surface 103 is contiguous with the end surface 103, that is, the first reinforcement member 12 is spaced from the end surface 103 by a distance of 0. On the basis, the first reinforcement 12 further comprises a second connecting portion 123, the second connecting portion 123 is provided on the end face 103, and the second connecting portion 123 is connected to the main body portion 121 and/or the first connecting portion 122.

For example, the body portion 121, the first connection portion 122, and the second connection portion 123 may be integrally formed structures. Alternatively, the first connecting portion 122 and the main body portion 121 are integrally formed, and the second connecting portion 123 is adhered to the main body portion 121 and/or the first connecting portion 122.

The tab 13 is disposed on the end surface 103, and the distance between the second connection portion 123 and the tab 13 is 2mm-20mm. Further, the distance between the second connection portion 123 and the tab 13 is 5mm to 10mm. For example, the distance between the second connection portion 123 and the tab 13 is 5mm, 8mm, 10mm, or the like. The second connecting part 123 covers part of the diaphragm, so that foreign matters of the die-cut tab 13 and burrs of the tab 13 are prevented from entering the diaphragm, the short circuit in the battery cell 10 is avoided, and the safety performance of the battery is improved. The distance between the second connection part 123 and the tab 13 refers to the minimum distance between the second connection part 123 and the tab 13, for example, the distance between the second connection part 123 and the tab 13 refers to the distance between the edge of the second connection part 123 near the tab 13 and the tab 13.

Further, the first reinforcement member 12 may further include a third connecting portion disposed at an end of the body portion 121 remote from the first connecting portion 122, the third connecting portion extending from the body portion 121 to the first surface 101 of the cell body 11 remote from the first connecting portion 122.

Wherein the first reinforcement member 12 may be composed of a main body portion 121, a first connecting portion 122, and a second connecting portion 123; or the first reinforcement member 12 may be composed of the main body portion 121, the first connecting portion 122, and the third connecting portion; or the first reinforcing member 12 may be composed of a main body portion 121, a first connecting portion 122, a second connecting portion 123, and a third connecting portion.

When the battery cell main body 11 is in a cuboid or approximately cuboid structure, the battery cell main body 11 is provided with a first side surface and a second side surface which are oppositely arranged, the two ends of the first side surface are respectively provided with a first reinforcement 12, and the two ends of the second side surface are respectively provided with a first reinforcement 12.

It will be appreciated that when the first reinforcement member 12 includes the body portion 121 and the first connecting portion 122, the body portion 121 may also be connected to the end face 103 of the cell body 11; the first connection part 122 is connected with the body part 121, and the first connection part 122 extends to one first surface 101 of the cell body 11, and the first connection part 122 is connected with the first surface 101 of the cell body 11.

The second reinforcement member 14 is disposed on the side 102 of the cell body 11, and the second reinforcement member 14 and the first reinforcement member 12 are spaced apart. The cell 10 may be provided with a plurality of second reinforcement members 14, the second reinforcement members 14 may be provided on the side 102 of the cell body 11, and the second reinforcement members 14 are located between the two first reinforcement members 12.

The second reinforcement 14 may include an adhesive body adhered to the side 102 of the body of the cell 10, a first adhesive portion and a second adhesive portion at both ends of the adhesive body, respectively. The first adhesive part is adhered to one first surface 101 of the cell main body 11, and the second adhesive part is adhered to the other first surface 101 of the cell main body 11.

The first reinforcement member 12 may be an insulating tape, and the first reinforcement member 12 is adhered to the cell body 11. The second reinforcement 14 may be an insulating tape, and the second reinforcement 14 is adhered to the cell body 11. Of course, in practical applications, the first reinforcement member 12 and the second reinforcement member 14 may be other insulating materials, and the embodiments of the present disclosure are not limited thereto.

Further, the battery cell 10 further includes an insulating film (mylar film) wound around the battery cell body 11, and the dimension of the insulating film in the length direction of the battery cell body 11 is greater than the length of the battery cell body 11.

The first reinforcement member 12 and the second reinforcement member 14 may be disposed between the cell main body 11 and the insulating film, that is, the insulating film may be wound around the cell main body 11 after the first reinforcement member 12 and the second reinforcement member 14 are bonded to the cell main body 11. Alternatively, the first reinforcement member 12 and the second reinforcement member 14 may be disposed on a side of the insulating film away from the cell body 11, that is, the insulating film may be wound around the cell body 11, and then the first reinforcement member 12 and the second reinforcement member 14 are bonded to the insulating film.

The battery cell 10 provided by the embodiment of the disclosure includes a battery cell main body 11, a tab 13 and a first reinforcement 12, the battery cell main body 11 is provided with an end face 103 and a side face 102 which are connected, the tab 13 extends from the end face of the battery cell main body 11, the first reinforcement 12 is connected with at least one second surface and at least one first surface 101 of the battery cell main body 11, the spacing of a diaphragm in the battery cell main body 11 is realized through the first reinforcement 12, the diaphragm is prevented from being folded, the failure rate of a battery device is reduced, the distance between the first reinforcement 12 and the end face 103 is less than or equal to 15mm, the protection of the end part of the battery cell main body 11 is realized, the problem that the battery cell main body 11 is prevented from being dropped and leaking foil due to the rounded corner interference on the battery cell casing 210 after the expansion of the battery cell main body 10 is avoided.

The exemplary embodiments of the present disclosure also provide a battery device including the battery cell 10. The battery cell 10 comprises a battery cell main body 11, a tab 13 and a first reinforcement 12, wherein the battery cell main body 11 is provided with two oppositely arranged first surfaces 101 and a plurality of second surfaces positioned between the two first surfaces 101, the area of the first surfaces 101 is larger than that of the second surfaces, and the plurality of second surfaces comprise an end face 103 and a side face 102 which are connected; the battery cell main body 11 comprises a plurality of layers of sequentially folded diaphragms, a pole piece is arranged between an end diaphragm and an adjacent diaphragm, the end diaphragm is an end diaphragm along the arrangement direction of the diaphragms in the plurality of layers of diaphragms, and one surface of the end diaphragm, which is far away from the pole piece, forms a first surface 101 of the battery cell main body 11; the tab 13 extends from the end face 103 of the cell body 11. The first reinforcement member 12 connects at least one second surface and at least one first surface 101 of the cell body 11, and the first reinforcement member 12 is at a distance of 15mm or less from the end face 103.

The battery device provided by the embodiment of the disclosure includes a battery cell 10, a battery cell main body 11 in the battery cell 10 is provided with an end face 103 and a side face 102 which are connected, a tab 13 extends from the end face of the battery cell main body 11, a first reinforcement 12 is connected with at least one second surface and at least one first surface 101 of the battery cell main body 11, limiting of a diaphragm in the battery cell main body 11 is achieved through the first reinforcement 12, diaphragm turnover is avoided, failure rate of the battery device is reduced, the first reinforcement 12 is located at the end part of the side face 102, which is close to the end face 103, the distance between the first reinforcement 12 and the end face 103 is less than or equal to 15mm, protection of the end part of the battery cell main body 11 is achieved, rounded corner interference between the battery cell main body 11 and a battery shell 210 is avoided, the problem of material dropping and foil leakage of the battery cell main body 11 is avoided, and quality of the battery device is improved.

The battery device in the embodiments of the present disclosure may be a unit cell, a battery pack, a battery module, a battery pack, or the like.

When the battery device is the single battery 100, as shown in fig. 3, the battery device may further include a housing 210 and a pole, a receiving space is provided in the housing 210, the battery cell 10 is disposed in the receiving space, the pole is disposed in the housing 210, and the pole is connected with the battery cell 10.

By way of example, the housing 210 may include a cover plate 212 and a housing body 211, the cover plate 212 and the housing body 211 being connected to form a closed receiving cavity. For example, the cover plate 212 and the case main body 211 may be connected by welding. In order to facilitate the connection between the cover plate 212 and the case main body 211, a flange protruding from the second surface of the case 210 may be provided on the cover plate 212 and/or the case main body 211, and the flange may be welded during welding, so that the welding is facilitated, and the high temperature damage to the battery cell 10 during the welding can be avoided. Of course, in practical applications, the cover plate 212 and the housing main body 211 may not be provided with flanges, which is not limited to the embodiment of the disclosure.

The cover plate 212 may be a flat plate structure, and the case main body 211 is provided with receiving recesses. The shell main body 211 may include an end surface 103 plate and a frame, where the end surface 103 plate and the cover plate 212 are disposed opposite to each other, the frame is disposed on a side of the end surface 103 plate facing the cover plate 212, the frame and the end surface 103 plate are connected to form a containing pit, and the cover plate 212 is covered on a side of the frame far away from the end surface 103 plate to form a sealed containing cavity.

When a flange is provided around the housing 210, the housing main body 211 may further include a flange, where the flange is provided on a side of the frame away from the end surface 103 plate, and the flange extends to the outside of the frame. The flange and the edge of the cover 212 are welded to form a flange on the housing 210.

When the battery device is a battery pack, the battery cell 10 is integrated in the housing 210 to form the unit battery 100, and a plurality of unit batteries 100 are integrated into the battery pack. As shown in fig. 4, the battery pack may further include a case 200, a confluence assembly, a heat exchange device, a control module, etc., wherein one or more battery compartments are provided in the case 200, and the unit batteries 100, the confluence assembly, and the heat exchange device are provided in the case 200.

The box 200 includes a base plate and a structural beam 201, the structural beam 201 is disposed on the base plate, and at least one battery compartment is formed on the base plate, and the battery compartment is used for accommodating devices such as batteries and buses. By way of example, the structural beams 201 may be attached to the base plate by welding or glue connection, etc.

The base plate may be a flat plate structure with structural beams 201 attached to the top surface of the base plate, the structural beams 201 forming one or more battery compartments on the base plate. The structural beams 201 may include side beams that enclose a frame and intermediate beams that are disposed within the frame to separate the frame into a plurality of battery compartments.

For example, the frame may include a first side beam, a second side beam, a third side beam, and a fourth side beam, which are sequentially connected to form a rectangular frame. A first middle beam and a second middle beam are arranged in the rectangular frame and are perpendicular to each other, and the first middle beam and the second middle beam divide the area in the frame into four battery compartments. Of course, in practical applications, the arrangement of the middle beams in the frame may be other forms, which is not limited by the embodiments of the disclosure.

The heat exchange device may include a heat exchange plate, which may be provided at the top of the battery, or the heat exchange plate may be provided at the bottom of the battery, or the heat exchange plate may be provided at the side of the battery. The heat exchange plate is internally provided with a heat exchange medium channel which is used for transmitting the heat exchange medium so as to cool the battery.

The bus bar assembly includes a plurality of bus bars for electrically connecting the plurality of unit cells 100. For example, the bus bar may connect a plurality of unit cells 100 in series, or the bus bar may connect a plurality of unit cells 100 in parallel. The buss bars may be connected to the poles of the battery or, in some embodiments, the buss bars may be connected to the housing 210 of the battery.

The battery device provided by the embodiment of the disclosure includes a battery cell 10, a battery cell main body 11 is provided with an end face 103 and a side face 102 which are connected in the battery cell 10, a first reinforcement 12 is arranged on the side face 102 of the battery cell main body 11, the first reinforcement 12 is connected with the side face 102 and at least one first surface 101, limiting of a diaphragm in the battery cell main body 11 is achieved through the first reinforcement 12, the diaphragm is prevented from being folded, the failure rate of the battery device is reduced, the first reinforcement 12 is arranged at the end part of the side face 102, which is close to the end face 103, the distance between the first reinforcement 12 and the end face 103 is less than or equal to 15mm, protection of the end part of the battery cell main body 11 is achieved, rounded corner interference between the expanded battery cell main body 10 and the battery cell casing 210 is avoided, the problem of material dropping and foil leakage of the battery cell main body 11 is avoided, and the quality of the battery device is improved.

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 (13)

1. A battery cell, wherein the battery cell comprises:

the battery cell comprises a battery cell body, wherein the battery cell body is provided with two oppositely arranged first surfaces and a plurality of second surfaces positioned between the two first surfaces, the area of the first surfaces is larger than that of the second surfaces, the plurality of second surfaces comprise connected end faces and side faces, the battery cell body comprises a plurality of layers of sequentially folded diaphragms, pole pieces are arranged between an end diaphragm and an adjacent diaphragm, the end diaphragm is a diaphragm at the end part of the multi-layer diaphragm along the arrangement direction of the diaphragms, and one surface of the end diaphragm, which is far away from the pole pieces, forms one first surface of the battery cell body;

the electrode lug extends to the end face of the battery cell main body to be out;

the first reinforcement is connected with at least one second surface and at least one first surface of the battery cell main body, and the distance between the first reinforcement and the end face is less than or equal to 15mm.

2. The cell of claim 1, wherein the first reinforcement comprises:

a main body part connected to a side surface of the battery cell main body;

the first connecting portion is connected with the main body portion, and extends to one first surface of the battery cell main body, and the first connecting portion is connected with the first surface of the battery cell main body.

3. The cell of claim 2, wherein an end of the first reinforcement adjacent the end face is contiguous with the end face.

4. The cell of claim 3, wherein the first reinforcement further comprises:

and the second connecting part is covered on the end face and is connected with the main body part and/or the first connecting part.

5. The cell of claim 4, wherein the second connection portion is spaced from the tab by a distance of 2mm to 20mm.

6. The cell of claim 4, wherein the second connection portion is spaced from the tab by a distance of 5mm to 10mm.

7. The cell of claim 2, wherein the first reinforcement further comprises:

the third connecting portion is arranged at one end, far away from the first connecting portion, of the main body portion, and extends from the main body portion to the first surface, far away from the first connecting portion, of the battery cell main body.

8. The cell of claim 1, wherein the cell further comprises:

the second reinforcement is arranged on the side face of the battery cell main body, and the second reinforcement and the first reinforcement are arranged at intervals.

9. The cell of claim 1, wherein the cell further comprises:

and the insulating film is wound on the battery cell main body, and the dimension of the insulating film in the length direction of the battery cell main body is larger than the length of the battery cell main body.

10. The cell of claim 1, wherein the length of the side of the cell body is greater than the length of the end face.

11. The cell of any of claims 1-10, wherein the cell is a laminated cell.

12. The cell of any one of claims 1-10, wherein the first reinforcement is an insulating tape.

13. A battery device comprising the cell of any one of claims 1-12.