CN220553584U - Battery and battery device - Google Patents

Abstract

The utility model relates to the technical field of batteries and discloses a battery and a battery device; the battery comprises a battery shell, a battery pole, a battery core and an insulating film; the battery shell comprises a cover plate, a bottom wall and a side wall, wherein the bottom wall and the side wall are of an integrated structure, and the cover plate is welded and fixed on one side of the side wall, which is away from the bottom wall; the battery post is connected to the bottom wall; the battery core is arranged in the battery shell and is electrically connected with the battery post; the insulating film is coated outside the battery core and is provided with an end sealing part which is at least positioned at one end of the insulating film close to the cover plate. The insulating film of the battery forms an insulating cover structure so as to improve the insulating performance of the insulating film and ensure the insulating effect between the battery core and the battery shell; and the thickness of the cover plate can be set thinner to improve the energy density of the battery.

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 comprising the battery.

Background

At present, the battery includes battery case and sets up the electric core in the battery case, needs insulating isolation between electric core and the battery case, consequently is provided with the insulating film between electric core and the battery case, because the insulating film generally can set up the sealing portion, sealing portion sets up and leads to the insulating film to follow-up risk such as fracture of taking place easily.

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 overcoming the drawbacks of the related art described above and providing a battery and a battery device including the same.

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

the battery shell comprises a cover plate, a bottom wall and a side wall, wherein the bottom wall and the side wall are of an integrated structure, and the cover plate is welded and fixed on one side of the side wall, which is away from the bottom wall;

a battery post connected to the bottom wall;

the battery core is arranged in the battery shell and is electrically connected with the battery pole;

the insulating film is coated outside the battery core and is provided with an end sealing part, and the end sealing part is at least positioned at one end of the insulating film, which is close to the cover plate.

The battery of this disclosure, on the one hand, can insulating isolation electric core and battery case through the insulating film, the insulating film has the end seal portion moreover for the insulating film forms insulating cover structure, with the insulating properties that improves the insulating film, guarantees the insulating effect between electric core and the battery case, thereby guarantees the electrical property of battery. On the other hand, the end sealing part is at least positioned at one end of the insulating film, which is close to the cover plate, the end sealing part of the insulating film can be firmly connected with the battery cell, the end sealing part of the insulating film can also be firmly connected with the cover plate, the connection between the end sealing part of the insulating film and the battery cell and the cover plate is whole-surface connection, the connection area of the connection relative to the annular surface without the end sealing part is large, the stability is high, and the connection process of the whole-surface connection relative to the annular surface connection is simple and the assembly efficiency is high because the thickness of the insulating film is thinner; in addition, the end sealing part is prevented from cracking due to structures such as pole lug parts of the battery cell. In yet another aspect, the thickness of the cover plate can be made thinner to increase the energy density of the battery, since the battery post is attached to the bottom wall rather than to the cover plate.

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

a battery box including a bottom plate;

the battery is the above-mentioned battery, and the battery is located in the battery box, and the bottom plate is used for supporting the battery, and the apron of battery is closer to the bottom plate for the diapire.

The battery device of this disclosure, on the one hand, can insulating isolation electric core and battery case through the insulating film, the insulating film has the end seal portion moreover for the insulating film forms insulating cover structure, with the insulating properties that improves the insulating film, guarantees the insulating effect between electric core and the battery case, thereby guarantees the electric properties of battery and battery device. On the other hand, the end sealing part is at least positioned at one end of the insulating film, which is close to the cover plate, the end sealing part of the insulating film can be firmly connected with the battery cell, the end sealing part of the insulating film can also be firmly connected with the cover plate, the connection between the end sealing part of the insulating film and the battery cell and the cover plate is whole-surface connection, the connection area of the connection relative to the annular surface without the end sealing part is large, the stability is high, and the connection process of the whole-surface connection relative to the annular surface connection is simple and the assembly efficiency is high because the thickness of the insulating film is thinner; in addition, the end sealing part is prevented from cracking due to structures such as pole ear parts of the battery core, so that the insulation effect between the battery core and the battery shell is ensured. In yet another aspect, since the battery post is attached to the bottom wall, rather than to the cover plate, the thickness of the cover plate can be made thinner to increase the energy density of the battery and battery device.

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 perspective view of an example embodiment of a battery of the present disclosure.

Fig. 2 is a schematic cross-sectional view of the battery of fig. 1.

Fig. 3 is a schematic perspective view of an exemplary embodiment of the insulating film of fig. 2.

Fig. 4 is a schematic perspective view of an exemplary embodiment of the insulating film of fig. 2.

Fig. 5 is a schematic structural view of the side seal portion in fig. 3 and 4.

Fig. 6 is a schematic structural view of an example embodiment of a battery device of the present disclosure.

Reference numerals illustrate:

1. a battery case; 11. a bottom wall; 12. a sidewall;

2. a cover plate; 3. a battery post;

4. a battery cell; 41. a cell body; 42. a tab portion;

5. an insulating film; 51. an end seal portion; 511. the tab is led out of the through hole; 52. a side seal portion; 521. a first end; 522. A second end; 523. A connection layer;

6. an insulating member; 7. An adhesive layer; 8. A hot melt connection;

10. a battery;

20. a battery box; 201. a bottom plate; 202. a first side frame; 203. a protective cover;

30. and (5) an adhesive layer.

Detailed Description

Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.

Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

The terms "a," "an," "the," "said" and "at least one" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.

In the present application, unless explicitly specified and limited otherwise, the term "coupled" is to be construed broadly, and for example, "coupled" may be either fixedly coupled, detachably coupled, or integrally formed; can be directly connected or indirectly connected through an intermediate medium. "and/or" is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

The present disclosure provides a battery 10, and referring to fig. 1 to 5, the battery 10 may include a battery case 1, a battery post 3, a battery cell 4, and an insulating film 5; the battery case 1 may include a cover plate 2, a bottom wall 11, and a side wall 12, the bottom wall 11 and the side wall 12 being of an integrally molded structure; the cover plate 2 is welded and fixed on one side of the side wall 12 away from the bottom wall 11; the battery post 3 is connected to the bottom wall 11; the battery core 4 is arranged in the battery shell 1 and is electrically connected with the battery pole 3; the insulating film 5 is coated outside the battery cell 4, and the insulating film 5 has an end sealing portion 51, and the end sealing portion 51 is at least located at one end of the insulating film 5 near the cover plate 2.

The battery 10 and the battery device of the disclosure can insulate and isolate the battery cell 4 from the battery case 1 through the insulating film 5, and the insulating film 5 is provided with the end sealing part 51, so that the insulating film 5 forms an insulating cover structure to improve the insulating performance of the insulating film 5 and ensure the insulating effect between the battery cell 4 and the battery case 1, thereby ensuring the electrical performance of the battery 10 and the battery device. On the other hand, the end sealing part 51 is at least positioned at one end of the insulating film 5 close to the cover plate 2, the end sealing part 51 of the insulating film 5 can be firmly connected with the battery cell 4, the end sealing part 51 of the insulating film 5 can also be firmly connected with the cover plate 2, the connection between the end sealing part 51 of the insulating film 5 and the battery cell 4 and the cover plate 2 is whole-surface connection, the connection area of the whole-surface connection relative to the annular surface connection without the end sealing part 51 is large, the stability is high, and the connection process of the whole-surface connection relative to the annular surface connection is simple and the assembly efficiency is high because the thickness of the insulating film 5 is thinner; in addition, the end sealing portion 51 is prevented from cracking due to the structures such as the tab portion 42 of the battery cell 4, so as to ensure the insulation effect between the battery cell 4 and the battery case 1. On the other hand, since the battery post 3 is attached to the bottom wall 11 instead of the cap plate 2, the thickness of the cap plate 2 can be set thinner to improve the energy density of the battery 10 and the battery device.

In the present exemplary embodiment, referring to fig. 1, the battery 10 may be a quadrangular battery 10, that is, the battery 10 may be provided in the shape of a rectangular parallelepiped, and correspondingly, the battery case 1 may be provided in the shape of a rectangular parallelepiped, and the battery case 1 may include a cover plate 2, a bottom wall 11, and four side walls 12; the four side walls 12 are arranged in pairs; the four side walls 12 are connected end to end in sequence to form a rectangular cylinder. Furthermore, the bottom wall 11 and the four side walls 12 are integrally formed, i.e., the bottom wall 11 and the four side walls 12 may be formed by an integral molding process, rather than being formed separately and then connected as an integral structure.

The cover plate 2 is welded and fixed to one side of the side walls 12 facing away from the bottom wall 11, so that the cover plate 2 is connected to one side of the four side walls 12, and the bottom wall 11 is connected to the opposite side of the four side walls 12, so that the bottom wall 11 is arranged opposite to the cover plate 2. It can be said that welded connection portions are provided between the cover plate 2 and the four side walls 12, and the cover plate 2 and the four side walls 12 are integrally connected by the welded connection portions.

The bottom wall 11, the cover plate 2 and the four side walls 12 surround a receiving chamber that forms the battery 10.

The material of the battery case 1 may be aluminum, steel, or other metal or alloy materials, but of course, other materials are also possible, and will not be described here.

Also, the thickness of the cap plate 2 is smaller than the thickness of the bottom wall 11 to reduce the weight of the battery case 1 and improve the energy density of the battery 10.

Of course, in other example embodiments of the present disclosure, the bottom wall 11 and the cover plate 2 may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side wall 12 may be provided in one or more and formed around the circular shape, the oval shape, the trapezoid shape, etc., such that the battery case 1 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc.

In the present exemplary embodiment, as shown with reference to fig. 2, the battery cell 4 is provided in the accommodation chamber of the battery case 1. The battery cell 4 may include a battery cell main body 41 and a tab portion 42, the battery cell main body 41 may include a stacked pole piece and an isolation film, and the pole piece may include a positive pole piece and a negative pole piece, and thus, the battery cell 4 may include a positive pole piece, an isolation film and a negative pole piece that are stacked in order. The battery cell 4 may be a winding type battery cell 4, and the winding type battery cell 4 is formed by winding a stacked structure formed by a positive electrode sheet, a separator and a negative electrode sheet. The cell main body 41 is also provided in a substantially rectangular parallelepiped structure so as to be fitted in the rectangular parallelepiped battery case 1. Different active substances are coated on the positive plate and the negative plate.

In other example embodiments of the present disclosure, the battery cell 4 may be a laminated battery cell 4, and the positive electrode sheet, the separator, and the negative electrode sheet are all provided in multiple layers, and the battery cell main body 41 is also provided in a rectangular parallelepiped structure for cooperation with the rectangular parallelepiped battery housing 1.

The battery cell 4 is used as a core charge-discharge structure of the battery 10, and the positive electrode plate and the negative electrode plate need to be led out to the battery shell 1 through the battery pole post 3 to form the positive electrode and the negative electrode.

In this exemplary embodiment, referring to fig. 2, the battery 10 may further include a battery post 3, where the battery post 3 is electrically connected to the battery cell 4 and protrudes from the bottom wall 11 to the outside of the battery case 1, specifically, two through holes are provided in the bottom wall 11, through which the two battery posts 3 penetrate, such that one ends of the two battery posts 3 protrude into the battery case 1, one battery post 3 is connected with the positive tab of the battery cell 4, and the other battery post 3 is connected with the negative tab of the battery cell 4; and the opposite end of the battery post 3 is located outside the battery case 1 to form the positive and negative electrodes of the battery 10.

The battery post 3 may be connected to the bottom wall 11, specifically, the battery post 3 may be clamped to the bottom wall 11, and a portion of the battery post 3 located outside the battery housing 1 may have a size larger than a portion of the battery post 3 located inside the battery housing 1, so that the bottom wall 11 may be clamped between a portion of the battery post 3 located outside the battery housing 1 and the battery cell 4. So that the bottom wall 11 can have a certain supporting effect on the battery post 3.

Since the battery post 3 of the battery 10 is provided on the bottom wall 11 instead of the cover plate 2, the thickness of the cover plate 2 can be set thinner to improve the energy density of the battery 10.

Of course, in other example embodiments of the present disclosure, one battery post 3 may be provided, and one tab of the battery cell 4 may be connected to the battery case 1, i.e., the battery case 1 serves as one electrode outlet of the battery 10.

In the present exemplary embodiment, referring to fig. 2, the insulating film 5 may be coated on the outside of the battery cell 4, the insulating film 5 has an end sealing portion 51, and the end sealing portion 51 is at least located at one end of the insulating film 5 near the cover plate 2, for example, referring to fig. 3, the insulating film 5 may have one end sealing portion 51, and the end sealing portion 51 is located at one end of the insulating film 5 near the cover plate 2; referring to fig. 4, the insulating film 5 may have two end sealing portions 51, one end sealing portion 51 being located at an end of the insulating film 5 near the lid plate 2, and the other end sealing portion 51 being located at an end of the insulating film 5 near the bottom wall 11.

The battery cell 4 and the battery case 1 can be insulated and isolated by the insulating film 5, and the insulating film 5 is provided with the end sealing part 51, so that the insulating film 5 forms an insulating cover structure to improve the insulating performance of the insulating film 5 and ensure the insulating effect between the battery cell 4 and the cover plate 2.

The end sealing portion 51 may be a single-layer structure integrally formed with other positions of the insulating film 5, that is, when the insulating film 5 is formed, the end sealing portion 51 is formed, so that the insulating film 5 may include a body portion and an extension portion, the body portion is rectangular and is coated on the outer peripheral surface of the battery cell 4; the shape of the extension part is the same as that of the bottom wall 11 or the cover plate 2, and the end face of the battery cell 4 is coated with the extension part to form an end sealing part 51.

The end sealing portion 51 may be formed by bending a portion of the insulating film 5 protruding from the battery cell 4, and in this case, a portion of the end sealing portion 51 may have a single-layer structure, and a portion of the end sealing portion 51 may have a two-layer or multi-layer structure.

In the present exemplary embodiment, the battery 10 may further include an insulating member 6, the insulating member 6 being provided in a plate shape; the insulator 6 is provided between the cap plate 2 and the insulating film 5, specifically, the insulator 6 is provided between the cap plate 2 and the end seal portion 51 of the insulating film 5, and the insulator 6 may be fixedly connected to the end seal portion 51.

If the insulating film 5 is not provided with the end seal portion 51, only the end face of the insulating film 5 near the cover plate 2 can be fixedly connected with the insulating member 6 to form a rectangular annular connecting portion, the width of the connecting portion is substantially the same as the thickness of the insulating film 5, and the thickness of the insulating film 5 is thin, thus resulting in weak fixation between the insulating film 5 and the insulating member 6.

The insulating member 6 is fixedly connected to the end sealing portion 51, so that the connection portion between the insulating member 6 and the insulating film 5 forms a rectangular planar connection portion, and the connection area is substantially the same as the area of the bottom surface of the battery cell 4, and is substantially larger than the rectangular annular connection portion. Thereby making the connection between the insulating member 6 and the insulating film 5 relatively stable; furthermore, the insulation effect between the battery cell 4 and the cover plate 2 can be further ensured by the insulation member 6.

Further, the battery 10 may further include an adhesive layer 7, and the adhesive layer 7 is adhered between the insulating member 6 and the end sealing portion 51 to fixedly connect the insulating member 6 and the end sealing portion 51, that is, fixedly connect the insulating member 6 and the end sealing portion 51 of the insulating film 5 through the adhesive layer 7. The bonding layer 7 is made of structural adhesive, the structural adhesive has high strength (the compression strength is more than 65MPa, the steel-steel forward pulling bonding strength is more than 30MPa, the shear strength is more than 18 MPa), can bear larger load, is ageing-resistant, fatigue-resistant and corrosion-resistant, has stable performance in the expected service life, and is suitable for bearing strong structural member bonding. The end sealing part 51 of the insulating film 5 can be coated with structural adhesive, then the insulating member 6 is attached to the structural adhesive, and the structural adhesive is cured to form the adhesive layer 7, so that the insulating member 6 is fixedly connected with the end sealing part 51 of the insulating film 5. Not only the connection stability between the insulating member 6 and the end seal portion 51 of the insulating film 5 is ensured, but also the process steps are simple and easy to implement.

In other example embodiments of the present disclosure, the battery 10 may further include a hot-melt connection portion 8, the hot-melt connection portion 8 being connected between the insulating member 6 and the end seal portion 51 to fixedly connect the insulating member 6 and the end seal portion 51. That is, the insulating material 6 is fixedly connected to the end seal portion 51 of the insulating film 5 by the heat-fusible link 8. The material of the insulating member 6 and the material of the insulating film 5 may be plastic, resin or the like which can be melted by heating, the insulating member 6 is attached to the end sealing portion 51 of the insulating film 5, then the insulating member 6 and the end sealing portion 51 of the insulating film 5 are melted by heating to form fluid, the insulating member 6 and the end sealing portion 51 of the insulating film 5 are integrated into a whole, the thermal melting connection portion 8 is formed after cooling and solidification, and the insulating member 6 and the end sealing portion 51 of the insulating film 5 are fixedly connected through the thermal melting connection portion 8. Not only the connection stability between the insulating member 6 and the end seal portion 51 of the insulating film 5 is ensured, but also the process steps are simple and easy to implement.

In the present example embodiment, the tab portion 42 may include a first tab and a second tab. The tab portion 42 is provided at least one end of the cell body 41, and for example, the first tab and the second tab may be provided at the same end face of the cell body 41.

Specifically, the first tab is connected to the positive electrode plate, and the first tab is located at a side of the first end surface facing away from the battery core main body 41; a part of the positive plate extends out of the battery core main body 41 and is bent to one side of the first end face away from the battery core main body 41 to form a first tab; in this case, the first tab may cover a portion of the first end face.

The second tab is connected to the negative electrode plate, and the second tab is located at a side of the first end surface facing away from the battery cell main body 41, and may be a part of the negative electrode plate extends and protrudes out of the battery cell main body 41, and is bent to a side of the first end surface facing away from the battery cell main body 41 to form the second tab; in this case, the second tab may cover a portion of the first end face.

The first tab and the second tab are conductive foil areas not provided with an active material coating, i.e., the first tab and the second tab are not coated with an active material coating, and are used for transmitting current.

Of course, the first tab and the second tab may be disposed on opposite end surfaces of the cell body 41.

Further, since the battery cell main body 41 needs to be connected to the battery post 3, and the battery post 3 is connected to the bottom wall 11, the tab portion 42 is at least provided at one end of the battery cell main body 41 close to the bottom wall 11, for example, the first tab and the second tab may be provided at one end of the battery cell main body 41 close to the bottom wall 11, or the first tab may be provided at one end of the battery cell main body 41 close to the bottom wall 11, and the second tab may be provided at one end of the battery cell main body 41 close to the cover plate 2.

Further, the terminal sealing portion 51 is provided with a tab lead-out through hole 511, and the tab lead-out through hole 511 is disposed opposite to the tab 42, so that the tab 42 can protrude through the tab lead-out through hole 511 and be electrically connected to the battery post 3 or the battery case 1.

Specifically, for example, referring to fig. 4, when the first tab and the second tab may be provided on the same end face of the battery cell main body 41 and both ends of the insulating film 5 near the cover plate 2 and the bottom wall 11 are provided with end seal portions 51, two tab outlet holes 511 are provided in the end seal portions 51 of the insulating film 5 near one end of the bottom wall 11, one tab outlet hole 511 is provided opposite to the first tab for leading out the first tab, and the other tab outlet hole 511 is provided opposite to the second tab for leading out the second tab.

In other example embodiments of the present disclosure, in the case where the first tab and the second tab may be provided at opposite end surfaces of the cell main body 41, and the end seal portions 51 are provided at both ends of the insulating film 5 near the cover plate 2 and the bottom wall 11, the end seal portion 51 of the insulating film 5 near one end of the bottom wall 11 is a first end seal portion, the end seal portion 51 of the insulating film 5 near one end of the cover plate 2 is a second end seal portion, one tab extraction through hole 511 is provided at the first end seal portion, the tab extraction through hole 511 is provided opposite to the first tab for extracting the first tab; a tab leading-out through hole 511 is provided at the second end sealing portion, and the tab leading-out through hole 511 is provided opposite to the second tab for leading out the second tab.

Further, the ratio of the area of the orthographic projection of the tab drawing through hole 511 on the bottom wall 11 to the area of the orthographic projection of the tab portion 42 on the bottom wall 11 is 1.01 or more and 1.3 or less, for example, the ratio of the area of the orthographic projection of the tab drawing through hole 511 on the bottom wall 11 to the area of the orthographic projection of the tab portion 42 on the bottom wall 11 may be 1.03, 1.05, 1.08, 1.1, 1.12, 1.15, 1.17, 1.2, 1.23, 1.25, 1.28, or the like.

If the ratio of the area of the orthographic projection of the tab extraction through hole 511 on the bottom wall 11 to the area of the orthographic projection of the tab 42 on the bottom wall 11 is too large, the area of the orthographic projection of the tab extraction through hole 511 on the bottom wall 11 is too large, that is, the opening area of the tab extraction through hole 511 is too large, so that the insulation effect between the battery cell 4 and the battery case 1 is affected.

If the ratio of the area of the orthographic projection of the tab extraction through hole 511 on the bottom wall 11 to the area of the orthographic projection of the tab 42 on the bottom wall 11 is too small, the area of the orthographic projection of the tab extraction through hole 511 on the bottom wall 11 is too small, i.e. the opening area of the tab extraction through hole 511 is too small, which is unfavorable for the smooth penetration of the tab 42.

The above ratio range not only ensures the insulation effect between the battery cell 4 and the battery case 1 and the cover plate 2, but also does not affect the smooth penetration of the tab portion 42.

In the present exemplary embodiment, referring to fig. 2 to 4, the side seal portion 52 in fig. 2 is shown by a broken line because it is blocked; the insulating film 5 may further include a side seal portion 52, the side seal portion 52 being located between the cell 4 and the side wall 12. Referring to fig. 5, the side seal portion 52 may include a connection layer 523, a first end 521, and a second end 522, the first end 521 and the second end 522 being opposite ends of the insulating film 5, the first end 521 and the second end 522 being overlapped, the connection layer 523 being provided between the first end 521 and the second end 522, and the connection layer 523 being an adhesive or a hot-melt connection portion 8. The insulating film 5 is wrapped around the side surface of the battery cell 4 so that the first end 521 and the second end 522 overlap, and then the first end 521 and the second end 522 are bonded by adhesive, or the first end 521 and the second end 522 are melted by hot melting, cooled, and then connected as a whole.

The side sealing part 52 is arranged to control the binding force of the insulating film 5 on the battery cell 4, so that the situation that the expansion of the battery cell 4 is influenced in the charging and discharging process of the battery 10, the transmission of lithium ions is influenced, and the local lithium precipitation is avoided; and avoid insulating film 5 to the constraint power of electric core 4 too little, lead to electric core 4 to unreel, make electric core 4 unable to pack into battery case 1, and avoid influencing the energy density of battery 10.

The ratio of the width K of the side seal portion 52 to the circumference of the edge of the insulating film 5 near the bottom wall 11 is 0.08 or more and 0.3 or less, for example, the ratio of the width K of the side seal portion 52 to the circumference of the insulating film 5 may be 0.1, 0.13, 0.15, 0.18, 0.2, 0.22, 0.25, 0.27, or the like.

If the ratio of the width K of the side seal portion 52 to the circumference of the insulating film 5 is too large, the width of the side seal portion 52 is too wide, and the space inside the battery case 1 is occupied too much, which is disadvantageous in improving the space utilization of the battery case 1 and the energy density of the battery 10.

If the ratio of the width K of the side seal portion 52 to the circumference of the insulating film 5 is too small, so that the width of the side seal portion 52 is too narrow, the battery cell 4 cannot be effectively restrained, the battery cell 4 is easily unwound, and the battery cell 4 cannot be mounted in the battery case 1.

The width K of the side seal portion 52 refers to the width at which the first end 521 and the second end 522 overlap, the circumference of the edge of the insulating film 5 near the bottom wall 11 refers to the length of one turn parallel to the bottom wall 11 or the cover plate 2, and the circumferences of the inner ring and the outer ring are substantially the same since the thickness of the insulating film 5 is thin, that is, the circumference of the edge of the insulating film 5 near the bottom wall 11 may be the circumference of the inner ring or the circumference of the outer ring.

The above ratio ranges not only ensure the space utilization of the battery case 1 and the energy density of the battery 10; and can effectively tie up electric core 4 for electric core 4 is difficult for the loose roll, and electric core 4 is packed into in the battery case 1 easily.

Based on the same inventive concept, the exemplary embodiments of the present disclosure provide a battery device, which may include a battery case 20 and a battery 10, as shown with reference to fig. 6; the battery 10 is any one of the above-described batteries 10, and the specific structure of the battery 10 has been described in detail above, and thus, will not be described here again.

The battery device may be provided in a rectangular parallelepiped structure, and therefore, the battery case 20 may be provided in a rectangular parallelepiped structure. Specifically, the battery case 20 may include a chassis 201, a protective cover 203, two first side frames 202, and two second side frames (not shown in the drawings), and the chassis 201 and the protective cover 203 may be provided in a rectangular shape. Two first side frames 202 and two second side frames are arranged around the bottom plate 201, the two first side frames 202 and the two second side frames are connected end to form a rectangular frame, the first side frames 202 extend along the length direction of the battery 10, the second side frames extend along the width direction of the battery 10, a protective cover 203 is arranged on the other side, opposite to the bottom plate 201, of the two first side frames 202 and the two second side frames, the protective cover 203 is arranged opposite to the bottom plate 201, and the two first side frames 202 and the two second side frames are connected between the protective cover 203 and the bottom plate 201. The bottom plate 201, the protective cover 203, the two first side frames 202, and the two second side frames surround the receiving chamber formed in the battery case 20.

Of course, in other example embodiments of the present disclosure, the bottom plate 201 and the protective cover 203 may be provided in a circular shape, an oval shape, a trapezoid shape, etc., and the side frames may be provided in one or more and surround to form a circular shape, an oval shape, a trapezoid shape, etc., such that the battery case 20 is formed in a cylindrical shape, an oval cylindrical shape, a prismatic shape, etc. Other shapes of the battery case 20 may be used, and will not be described in detail herein.

Further, the battery box 20 may not include the protective cover 203, and for example, in the case where a plurality of battery devices are stacked one above another, the battery device located below may not be provided with the protective cover 203, and only the battery device located uppermost may be provided with the protective cover 203, and the bottom plate 201 of the upper battery device may serve as the protective cover 203 of the lower battery device.

The battery 10 is provided in the battery case 20, and the bottom plate 201 is provided to support the battery 10, and the lid plate 2 of the battery 10 is closer to the bottom plate 201 than the bottom wall 11. The battery 10 bonds in the battery box 20 through bonding glue film 30, so set up and make the apron 2 of battery 10 bond with bottom plate 201 through bonding glue film 30, bonding glue film 30 not only is located between apron 2 and the bottom plate 201 in the bonding process, and under the effect of the extrusion force of battery 10, bonding glue film 30 can be extruded to between curb plate and first side frame 202 and the second side frame of battery 10, still between the curb plate of two adjacent batteries 10 to further seal between apron 2 and the curb plate through bonding glue film 30, in order to guarantee the sealed effect of battery 10.

The terms "parallel" and "perpendicular" as used in this application may not only be perfectly parallel, perpendicular, but may also have some error; for example, the included angle between the two is greater than or equal to 0 ° and less than or equal to 5 °, i.e. the two are considered to be parallel to each other; the included angle between the two is more than or equal to 85 degrees and less than or equal to 95 degrees, namely the two are considered to be mutually perpendicular.

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 (10)

1. A battery, comprising:

the battery shell comprises a cover plate, a bottom wall and a side wall, wherein the bottom wall and the side wall are of an integrated structure, and the cover plate is welded and fixed on one side of the side wall, which is away from the bottom wall;

a battery post connected to the bottom wall;

the battery core is arranged in the battery shell and is electrically connected with the battery pole;

the insulating film is coated outside the battery cell and is provided with an end sealing part, and the end sealing part is at least positioned at one end of the insulating film, which is close to the cover plate.

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

and the insulating piece is arranged between the cover plate and the insulating film and is fixedly connected with the end sealing part.

3. The battery of claim 2, wherein the battery further comprises:

and the bonding layer is bonded between the insulating piece and the end sealing part so as to fixedly connect the insulating piece and the end sealing part.

4. The battery of claim 2, wherein the battery further comprises:

and the hot melting connecting part is connected between the insulating part and the end sealing part so as to fixedly connect the insulating part with the end sealing part.

5. The battery according to any one of claims 1 to 4, wherein the cell includes:

a cell body;

the battery cell comprises a battery cell main body, a battery cell and a terminal lug part, wherein the battery cell main body is arranged at least at one end, close to the bottom wall, of the battery cell main body, an end sealing part is arranged at one end, close to the bottom wall, of the insulating film, a terminal lug leading-out through hole is arranged on the end sealing part, and the terminal lug leading-out through hole and the terminal lug part are oppositely arranged.

6. The battery according to claim 5, wherein a ratio of an area of orthographic projection of the tab lead-out through hole on the bottom wall to an area of orthographic projection of the tab portion on the bottom wall is 1.01 or more and 1.3 or less.

7. The battery according to any one of claims 1 to 4, wherein the insulating film further comprises a side seal portion located between the cell and the side wall.

8. The battery according to claim 7, wherein a ratio of a width of the side seal portion to a perimeter of an edge of the insulating film near the bottom wall is 0.08 or more and 0.3 or less.

9. The battery of any one of claims 1-4, wherein the cover plate has a thickness that is less than a thickness of the bottom wall.

10. A battery device, characterized by comprising:

a battery box including a bottom plate;

a battery according to any one of claims 1 to 9, wherein the battery is provided in the battery box, the bottom plate is configured to support the battery, and a cover plate of the battery is closer to the bottom plate than the bottom wall.