CN219873748U - Battery cell - Google Patents

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises: the battery shell is provided with a liquid injection hole; the battery cell is arranged in the battery shell; the bottom support, the bottom support sets up between battery case and electric core, is provided with first through-hole and second through-hole on the bottom support, and the area of first through-hole is less than the area of second through-hole, on guaranteeing that electrolyte can form the basis that circulation flows through the bottom support, also can make the second through-hole can realize the rapid flow of electrolyte, and first through-hole also can reduce the foreign matter in the battery case along with electrolyte entering electric core inside, can improve the security performance of battery to a certain extent.

Description

Battery cell

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery.

Background

In the related art, the battery core inside the battery needs to be soaked through electrolyte, and a certain soaking time is needed after the electrolyte is injected into the battery shell, so that the soaking capacity of the electrolyte is ensured, and the electric performance of the battery core is ensured.

However, in the related art, the bottom of the battery cell is provided with a bottom support, and the wettability of the electrolyte is affected due to the structural limitation of the bottom support.

Disclosure of Invention

The utility model provides a battery, which is used for improving the service performance of the battery.

The present utility model provides a battery comprising:

the battery shell is provided with a liquid injection hole;

the battery cell is arranged in the battery shell;

the bottom support is arranged between the battery shell and the battery cell, a first through hole and a second through hole are formed in the bottom support, and the area of the first through hole is smaller than that of the second through hole.

The battery comprises a battery shell, a battery cell and a bottom support, wherein the battery cell and the bottom support are arranged in the battery shell, and the bottom support is arranged at the bottom of the battery cell, so that the battery cell is supported and protected. Through being provided with annotating the liquid hole on the battery casing, and be provided with first through-hole and second through-hole on the bottom sprag, thereby can pour into the battery casing inside with electrolyte through annotating the liquid hole, and realize the infiltration to the electric core, and the electrolyte can form the circulation through first through-hole and second through-hole, be favorable to the quick circulation distribution of electrolyte in the electric core, improve the infiltration efficiency of electrolyte, and the area of first through-hole is less than the area of second through-hole, on guaranteeing that the electrolyte can form the basis that circulates through bottom sprag, also can make the second through-hole can realize the rapid flow of electrolyte, and first through-hole also can reduce the foreign matter in the battery casing along with the electrolyte entering electric core inside, can improve the security performance of battery to a certain extent.

Drawings

For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, the relevant elements or components may have different arrangements as known in the art. Furthermore, in the drawings, like reference numerals designate identical or similar parts throughout the several views.

Wherein:

fig. 1 is a schematic view showing a structure of a battery according to an exemplary embodiment;

fig. 2 is a partially exploded structural schematic view of a battery according to an exemplary embodiment;

FIG. 3 is a schematic view of the bottom support of a battery according to an exemplary embodiment;

fig. 4 is a schematic structural view of an insulating film of a battery according to an exemplary embodiment;

fig. 5 is a schematic view illustrating a structure of a battery according to another exemplary embodiment.

The reference numerals are explained as follows:

10. a battery case; 11. a liquid injection hole; 12. a first surface; 13. a second surface; 14. a third surface; 15. a cover plate; 16. a housing member; 20. a battery cell; 30. a bottom support; 31. a first through hole; 32. a second through hole; 33. a plane; 34. a curved surface; 40. an insulating film; 41. a third through hole; 42. a fourth through hole; 43. an accommodation space; 50. a first pole; 60. and a second pole.

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.

An embodiment of the present utility model provides a battery, referring to fig. 1 to 5, the battery includes: a battery case 10, wherein a liquid injection hole 11 is formed in the battery case 10; the battery cell 20, the battery cell 20 is set up in the battery shell 10; the battery pack comprises a bottom support 30, wherein the bottom support 30 is arranged between the battery case 10 and the battery cell 20, a first through hole 31 and a second through hole 32 are arranged on the bottom support 30, and the area of the first through hole 31 is smaller than that of the second through hole 32.

The battery of one embodiment of the utility model comprises a battery case 10, a battery cell 20 and a bottom support 30, wherein the battery cell 20 and the bottom support 30 are arranged in the battery case 10, and the bottom support 30 is arranged at the bottom of the battery cell 20, thereby forming support protection for the battery cell 20. Through being provided with annotating liquid hole 11 on battery case 10, and be provided with first through-hole 31 and second through-hole 32 on the bottom sprag 30, thereby can pour into battery case 10 inside with electrolyte through annotating liquid hole 11, and realize the infiltration to electric core 20, and electrolyte can form the circulation through first through-hole 31 and second through-hole 32, be favorable to the quick circulation distribution of electrolyte in electric core 20, improve the infiltration efficiency of electrolyte, and the area of first through-hole 31 is less than the area of second through-hole 32, on guaranteeing that the electrolyte can form the circulation flow through bottom sprag 30, also can make second through-hole 32 can realize the rapid flow of electrolyte, and first through-hole 31 also can reduce the foreign matter in the battery case 10 along with electrolyte entering electric core 20 inside, can improve the security performance of battery to a certain extent.

It should be noted that, as shown in fig. 1, the battery case 10 is provided with a liquid injection hole 11, and the electrolyte may be injected into the battery case 10 through the liquid injection hole 11, and after the electrolyte is injected, the liquid injection hole 11 may be sealed by a sealing structure.

After the electrolyte enters the battery shell 10, the electrolyte can infiltrate the battery cell 20, and the electrolyte which cannot infiltrate into the battery cell 20 can form circulating flow on the bottom support 30 through the first through hole 31 and the second through hole 32 in the injection process or after the injection is completed, so that the rapid flow of the electrolyte can be ensured, the rapid infiltration of the battery cell 20 is formed, and the infiltration capacity of the electrolyte is improved. For example, during the charge and discharge of the battery, part of the electrolyte is stored in the battery case 10, and the bottom support 30 is located at the bottom of the battery cell 20, and at this time, the electrolyte is stored at the bottom of the battery case 10, so that after the battery is charged and discharged for a long time, the electrolyte can infiltrate into the battery cell 20 through the bottom support 30, thereby ensuring the electrical performance of the battery.

The area of the first through hole 31 is smaller than that of the second through hole 32, namely, the area of the first through hole 31 is inconsistent with that of the second through hole 32, and the electrolyte can quickly flow through the second through hole 32 with a relatively large area, so that the flow rate of the electrolyte is improved, and the infiltration capacity of the electrolyte is further ensured. The first through hole 31 with a relatively smaller area can ensure the circulation of the electrolyte, and can reduce the probability that sundries in the battery shell 10 enter the battery core 20 along with the electrolyte through the first through hole 31, so as to avoid the safety problem of the battery.

In one embodiment, the battery case 10 includes the first surface 12 and the second surface 13, the injection hole 11 is located on the first surface 12, at least part of the bottom support 30 is located on one side of the battery cell 20 near the second surface 13, and the first through hole 31 and the second through hole 32 are located opposite to the second surface 13, i.e., the first surface 12 and the second surface 13 are not located on the same surface of the battery case 10, so that the bottom support 30 can be prevented from shielding the injection of the electrolyte, and the electrolyte injection capability is improved.

The battery case 10 includes the first surface 12 and the second surface 13, that is, the first surface 12 and the second surface 13 are not on the same surface of the battery case 10, but the electrolyte injection hole 11 is located on the first surface 12, and at least part of the bottom support 30 is located on one side of the cell 20 close to the second surface 13, that is, the electrolyte injection hole 11 and the bottom support 30 form a staggered arrangement, so that when the electrolyte is injected through the electrolyte injection hole 11, the electrolyte will first pass through the cell 20, not first pass through the bottom support 30, thereby improving the infiltration capability of the electrolyte.

In one embodiment, the orthographic projections of the first through hole 31, the second through hole 32 and the injection hole 11 toward the second surface 13 are respectively a first orthographic projection, a second orthographic projection and a third orthographic projection, the distance between the first orthographic projection and the third orthographic projection is greater than the distance between the second orthographic projection and the third orthographic projection, that is, the distance between the injection hole 11 and the second through hole 32 is smaller than the distance between the injection hole 11 and the first through hole 31, considering that the electrolyte amount in the cell 20 on the side close to the injection hole 11 is relatively small, the electrolyte amount in the cell 20 on the side far from the injection hole 11 is relatively small, the electrolyte on the side far from the injection hole can rapidly flow into the liquid storage space outside the cell 20 through the second through hole 32 of the bottom support 30, which is favorable for rapid circulation distribution of the electrolyte in the cell 20, and the electrolyte flowing outside the cell 20 flows into the cell 20 through the first through hole 31, while the area of the first through hole 31 is relatively small, which can effectively prevent foreign matters in the cell housing 10 from entering the cell 20 along with the electrolyte inside the cell 20.

In one embodiment, as shown in fig. 1 and 5, the battery case 10 further includes two opposite third surfaces 14, the area of the third surfaces 14 is larger than the area of the first surface 12, and the area of the third surfaces 14 is larger than the area of the second surface 13, so that when the batteries are grouped, the third surfaces 14 of adjacent batteries can be oppositely arranged, thereby improving the space utilization rate of the batteries when the batteries are grouped, and further improving the space utilization rate of the battery pack.

In one embodiment, as shown in fig. 1, the first surface 12 and the second surface 13 are opposite to each other, the injection hole 11 is located on the first surface 12, at least part of the bottom support 30 is located on one side of the cell 20 near the second surface 13, when the electrolyte is injected, the first surface 12 is located at the top of the battery, and the second surface 13 is located at the bottom of the battery, at this time, the electrolyte is injected into the cell 20 through the injection hole 11, the electrolyte that cannot infiltrate into the cell 20 in time flows to the bottom of the cell 20, and flows into the outer side of the bottom support 30 in time through the second through hole 32 near the injection hole 11, and then infiltrates into the cell 20 through the first through hole 31, thereby improving the infiltration efficiency of the electrolyte.

In one embodiment, as shown in fig. 1, the battery further includes a first post 50 and a second post 60, where the first post 50 and the second post 60 are disposed on the first surface 12 and electrically connected to the battery cell 20, so that the first post 50 and the second post 60 can be used as two electrode terminals of the battery, thereby facilitating grouping of subsequent batteries.

One of the first and second posts 50 and 60 is a positive post and the other is a negative post, and the battery cell 20 may include a positive tab and a negative tab, which are electrically connected to the positive tab and the negative tab, respectively. The positive and negative tabs may extend from the same end of the cell 20, or the positive and negative tabs may extend from opposite ends of the cell 20.

In one embodiment, as shown in fig. 5, the first surface 12 and the second surface 13 are disposed vertically, and the injection hole 11 is located on the first surface 12, at least a portion of the bottom support 30 is located on a side of the cell 20 near the second surface 13, and the first surface 12 is located on top of the cell and the second surface 13 is located on a side of the cell when the electrolyte is injected. After the electrolyte is injected, the first surface 12 is located at the top of the battery, the second surface 13 is located at the bottom of the battery, part of the electrolyte flows out of the cell 20, and part of the electrolyte in the cell 20 near the injection hole 11 is relatively more, so that the flow speed of the electrolyte can be increased by making the area of the second through hole 32 near the injection hole 11 relatively larger.

In one embodiment, as shown in fig. 5, the battery further includes a first pole 50 and a second pole 60, the first pole 50 is disposed on the first surface 12, the second pole 60 is disposed on a surface of the battery housing 10 opposite to the first surface 12, and the first pole 50 and the second pole 60 are electrically connected with the battery cell 20, so that when the battery is assembled, the first pole 50 and the second pole 60 can be respectively located at opposite ends of the battery, and the battery can be conveniently assembled, and the battery can be prevented from increasing the height space of the battery pack.

It should be noted that, the battery case 10 may have one or more battery cells 20 disposed therein, which is not limited herein.

In one embodiment, the area of the second through hole 32 is not smaller than the area of the liquid injection hole 11, so that the electrolyte can flow through the second through hole 32 quickly, and the infiltration capacity of the electrolyte is improved.

Be provided with annotating liquid hole 11 on the battery case 10, be provided with second through-hole 32 on the bottom sprag 30, the area of second through-hole 32 is not less than annotating liquid hole 11's area, annotates liquid hole 11 on the battery case 10 and can not be too big to can avoid annotating liquid hole 11 to influence the structural strength of battery case 10.

In one embodiment, the ratio of the area of the second through hole 32 to the area of the liquid injection hole 11 is 1.05-2, and on the basis of ensuring that the area of the second through hole 32 is larger than the area of the liquid injection hole 11, the influence of the relatively excessive area of the second through hole 32 on the structural strength of the bottom support 30 can be avoided.

The ratio of the area of the second through-hole 32 to the area of the pouring hole 11 may be 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95, or 2, etc.

In one embodiment, the ratio of the area of the second through hole 32 to the area of the bottom support 30 is 0.2% -0.8%, so that the electrolyte can flow through the bottom support 30 normally, the structural strength of the bottom support 30 can be ensured, and the problem of overlarge occupied area of the second through hole 32 is avoided.

The ratio of the area of the second through hole 32 to the area of the bottom support 30 may be 0.2%, 0.22%, 0.25%, 0.28%, 0.3%, 0.32%, 0.35%, 0.38%, 0.4%, 0.42%, 0.45%, 0.48%, 0.5%, 0.52%, 0.55%, 0.58%, 0.6%, 0.62%, 0.65%, 0.68%, 0.7%, 0.72%, 0.75%, 0.78%, or 0.8%, etc.

The battery includes a cell and an electrolyte, and is a minimum unit capable of performing an electrochemical reaction such as charge/discharge. The battery cell refers to a unit formed by winding or laminating a stacked portion, wherein the stacked portion comprises a first pole piece, a separator and a second pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. Wherein the polarities of the first pole piece and the second pole piece can be interchanged. The first and second pole pieces are coated with an active substance.

In one embodiment, the battery may be a square battery, that is, the battery may be a quadrangular battery, where the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism is necessarily a strictly defined straight line, and corners between sides are not necessarily right angles, and may be arc transitions.

The battery can be a laminated battery, so that the battery is not only convenient to group, but also long in length. Specifically, the battery cell is a laminated battery cell, and the battery cell is provided with 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, which are mutually laminated, so that a plurality of pairs of the first pole piece and the second pole piece are stacked to form the laminated battery cell.

Alternatively, the battery may be a wound battery in which a first pole piece, a second pole piece opposite in electrical property to the first pole piece, and a separator sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

In one embodiment, bottom support 30 is a flat plate having a planar surface 33 or curved surface 34 in the corner region of bottom support 30, which can provide a reliable support for cell 20, improving the stability of cell 20, while the corner region of bottom support 30 has a planar surface 33 or curved surface 34, which can avoid right angles in the corner region of bottom support 30, thereby avoiding interference between bottom support 30 and cell housing 10, and which can also facilitate the installation of bottom support 30.

The corner regions inside the battery case 10 may be of a non-right angle configuration, and at this time, by providing the corner regions of the bottom support 30 with a flat surface 33 or a curved surface 34, the bottom support 30 and the battery case 10 can be reliably fitted, and the bottom support 30 can be easily installed.

In one embodiment, as shown in connection with fig. 3, bottom support 30 may be a generally rectangular plate, bottom support 30 has four corner regions, two corner regions at one end of bottom support 30 have flat surfaces 33 along the length of bottom support 30, two corner regions at the other end of bottom support 30 have curved surfaces 34, curved surfaces 34 may match the corner regions of battery housing 10, thereby providing a better fit to battery housing 10, flat surfaces 33 may better enable bottom support 30 to fit within battery housing 10, and flat surfaces 33 may be designed to provide a foolproof effect, improving the efficiency of the installation of battery bottom support 30.

As shown in fig. 3, two corner regions of one end of the bottom support 30 have a flat surface 33, two corner regions of the other end of the bottom support 30 have a curved surface 34, the curved surface 34 may be an arc surface, and corner regions of the inner surface of the battery case 10 may be arc surfaces. Plane 33 may be considered to cut a corner of bottom support 30 into a plane.

It should be noted that in some embodiments, the battery may be a cylindrical battery. The battery can be a winding type battery, namely, 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 are wound to obtain a winding type battery cell.

In one embodiment, as shown in fig. 2 and 4, the battery further includes an insulating film 40, the insulating film 40 wraps the battery cell 20, a third through hole 41 and a fourth through hole 42 are disposed on a side of the insulating film 40 facing the bottom support 30, the insulating film 40 can effectively insulate and protect the battery cell 20, the insulating capability of the battery cell 20 is improved, and the third through hole 41 and the fourth through hole 42 can also form the flow of the electrolyte, so as to improve the wetting capability of the electrolyte.

The electrolyte may flow inside and outside the insulating film 40 through the third through holes 41 and the fourth through holes 42, and flow on both sides of the bottom support 30 through the first through holes 31 and the second through holes 32, thereby improving the flow ability of the electrolyte, thereby securing the wetting ability of the electrolyte.

In one embodiment, the orthographic projections of the third through hole 41 and the fourth through hole 42 toward the bottom support 30 are a fourth orthographic projection and a fifth orthographic projection, respectively, where the fourth orthographic projection coincides with at least a portion of the first through hole 31 and the fifth orthographic projection coincides with at least a portion of the second through hole 32, so that the first through hole 31 and the third through hole 41 may be disposed opposite to each other, and the fourth through hole 42 and the second through hole 32 may be disposed opposite to each other, so as to increase the flow rate of the electrolyte, and further improve the wettability of the electrolyte.

In one embodiment, the area of the first through hole 31 is consistent with the area of the third through hole 41, and the fourth orthographic projection is completely coincident with the first through hole 31, so that not only can the installation direction of the bottom support 30 be conveniently controlled, but also the electrolyte can flow through the first through hole 31 and the third through hole 41 quickly, and the flowing performance of the electrolyte can be improved in the electrolyte injection process, so that the infiltration capacity of the electrolyte is improved, and the service performance of the battery is reliably improved.

In one embodiment, the area of the second through hole 32 is consistent with the area of the fourth through hole 42, and the fifth orthographic projection is completely coincident with the second through hole 32, so that not only can the installation direction of the bottom support 30 be conveniently controlled, but also the electrolyte can flow through the second through hole 32 and the fourth through hole 42 quickly, and the flow performance of the electrolyte can be improved in the electrolyte injection process, so that the infiltration capacity of the electrolyte is improved, and the service performance of the battery is reliably improved.

In one embodiment, the area of the first through hole 31 is consistent with the area of the third through hole 41, the fourth orthographic projection is completely coincident with the first through hole 31, the area of the second through hole 32 is consistent with the area of the fourth through hole 42, and the fifth orthographic projection is completely coincident with the second through hole 32, so that the flow of the electrolyte can be effectively ensured, and the infiltration capacity of the electrolyte can be improved.

In one embodiment, the fourth orthographic projection is not overlapped with the portion of the first through hole 31, and the fifth orthographic projection is not overlapped with the portion of the second through hole 32, so that the bottom support 30 can form a partial shielding for the third through hole 41 and the fourth through hole 42, and the problem of dropping the battery cell 20 can be avoided to a certain extent, so that the corrosion of the battery case 10 can be effectively avoided.

It should be noted that, in some embodiments, the area of the first through hole 31 and the area of the third through hole 41 may not be identical, and the area of the second through hole 32 and the area of the fourth through hole 42 may not be identical.

In one embodiment, as shown in fig. 4, the insulating film 40 is formed with a receiving space 43, at least a portion of the battery cell 20 is positioned in the receiving space 43, so that effective protection of the battery cell 20 can be formed, and an opening of the receiving space 43 can be used to achieve rapid flow of the electrolyte into the battery cell 20, improving the wettability of the electrolyte.

In one embodiment, the insulating film 40 is fixedly connected to the bottom support 30, so that the connection stability of the insulating film 40 and the bottom support 30 can be ensured, and the position deviation between the insulating film 40 and the bottom support 30 is avoided, so that the safety stability of the battery can be reliably improved.

In one embodiment, the insulating film 40 is fixedly connected with the bottom support 30 by hot melting, so that not only can the connection between the insulating film 40 and the bottom support 30 be conveniently realized, but also the connection stability between the insulating film 40 and the bottom support 30 can be ensured.

The bottom support 30 may be a bottom plate, the bottom support 30 may be a plastic structure, and the insulating film 40 and the bottom support 30 may be connected by bonding, laser welding, or the like, which is not limited herein.

In one embodiment, as shown in fig. 3, one of the first through hole 31 and the second through hole 32 is a circular hole, and the other is a kidney-shaped hole, so that the kidney-shaped hole can be used as a positioning hole on the basis of ensuring that the electrolyte can flow through the first through hole 31 and the second through hole 32, and the installation efficiency of the bottom support 30 can be improved to some extent.

It should be noted that the structures of the first through hole 31 and the second through hole 32 may be identical, for example, the first through hole 31 and the second through hole 32 may be circular holes, rectangular holes, diamond holes, triangular holes, kidney holes, or the like. The structural form of the first through hole 31 and the second through hole 32 may not be identical.

In one embodiment, as shown in fig. 1 and 2, the battery case 10 includes a cover plate 15, and the liquid injection hole 11 is provided on the cover plate 15, so that not only can the provision of the liquid injection hole 11 be facilitated, thereby improving the manufacturing efficiency of the battery case 10.

The battery housing 10 may further include a housing member 16, the cover 15 may be welded to the housing member 16, and the cover 15 may be one as shown in connection with fig. 1.

It should be noted that, for the battery case 10 in fig. 5, two opposing cover plates may be included.

An embodiment of the present utility model also provides a battery pack including the above-described battery.

The battery of the battery pack according to one embodiment of the present utility model includes a battery case 10, a battery cell 20, and a bottom support 30, the battery cell 20 and the bottom support 30 being disposed within the battery case 10, and the bottom support 30 being disposed at the bottom of the battery cell 20, thereby forming support protection for the battery cell 20. Through being provided with annotating liquid hole 11 on battery case 10, and be provided with first through-hole 31 and second through-hole 32 on the bottom sprag 30, thereby can pour into battery case 10 inside with electrolyte through annotating liquid hole 11, and realize the infiltration to electric core 20, and electrolyte can form the circulation through first through-hole 31 and second through-hole 32, be favorable to the quick circulation distribution of electrolyte in electric core 20, improve the infiltration efficiency of electrolyte, and the area of first through-hole 31 is less than the area of second through-hole 32, on guaranteeing that the electrolyte can form the circulation flow through bottom sprag 30, also can make second through-hole 32 can realize the rapid flow of electrolyte, and first through-hole 31 also can reduce the foreign matter in the battery case 10 along with electrolyte entering electric core 20 inside, can improve the security performance of battery to a certain extent.

In one embodiment, the battery pack is a battery module or a battery pack.

The battery module includes a plurality of batteries, and the battery module can also include end plate and curb plate, and end plate and curb plate are used for fixed a plurality of batteries.

It should be noted that, a plurality of batteries may be disposed in the battery case after forming the battery module, and may be fixed by the end plate and the side plate. The plurality of cells may be disposed directly in the cell case, i.e., without grouping the plurality of cells, at which time the end plates and the side plates may be removed.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the utility model 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. The specification and example embodiments are to be considered exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims (23)

1. A battery, comprising:

a battery case (10), wherein a liquid injection hole (11) is formed in the battery case (10);

a battery cell (20), wherein the battery cell (20) is arranged in the battery shell (10);

the battery pack comprises a bottom support (30), wherein the bottom support (30) is arranged between the battery shell (10) and the battery cell (20), a first through hole (31) and a second through hole (32) are formed in the bottom support (30), and the area of the first through hole (31) is smaller than that of the second through hole (32).

2. The battery according to claim 1, wherein the battery case (10) includes a first surface (12) and a second surface (13), the liquid injection hole (11) is located on the first surface (12), at least part of the bottom support (30) is located on a side of the cell (20) close to the second surface (13), and the first through hole (31) and the second through hole (32) are disposed opposite to the second surface (13).

3. The battery according to claim 2, characterized in that the orthographic projections of the first through hole (31), the second through hole (32) and the liquid injection hole (11) towards the second surface (13) are a first orthographic projection, a second orthographic projection and a third orthographic projection, respectively, the distance between the first orthographic projection and the third orthographic projection being greater than the distance between the second orthographic projection and the third orthographic projection.

4. The battery according to claim 2, characterized in that the battery housing (10) further comprises two opposing third surfaces (14), the third surfaces (14) having an area larger than the area of the first surface (12), the third surfaces (14) having an area larger than the area of the second surface (13).

5. A battery according to any one of claims 2-4, characterized in that the first surface (12) and the second surface (13) are oppositely arranged.

6. The battery of claim 5, further comprising a first post (50) and a second post (60), wherein the first post (50) and the second post (60) are disposed on the first surface (12) and are electrically connected to the electrical cell (20).

7. A battery according to any one of claims 2-4, characterized in that the first surface (12) and the second surface (13) are arranged perpendicularly.

8. The battery of claim 7, further comprising a first post (50) and a second post (60), the first post (50) disposed on the first surface (12), the second post (60) disposed on a surface of the battery housing (10) opposite the first surface (12), the first post (50) and the second post (60) each electrically connected to the electrical cell (20).

9. The battery according to any one of claims 1 to 4, wherein an area of the second through hole (32) is not smaller than an area of the liquid injection hole (11).

10. The battery according to claim 9, characterized in that the ratio of the area of the second through hole (32) to the area of the liquid injection hole (11) is 1.05-2.

11. The battery according to any one of claims 1 to 4, characterized in that the ratio of the area of the second through holes (32) to the area of the bottom support (30) is 0.2% -0.8%.

12. The battery according to any one of claims 1 to 4, wherein the battery is a quadrangular battery.

13. The cell of claim 12, wherein the bottom support (30) is a flat plate, and corner regions of the bottom support (30) have a flat surface (33) or a curved surface (34).

14. The cell of claim 13, wherein said bottom support (30) has four corner regions, two of said corner regions at one end of said bottom support (30) having said flat surface (33) and two of said corner regions at the other end of said bottom support (30) having said curved surface (34) along the length of said bottom support (30).

15. The battery according to any one of claims 1 to 4, further comprising an insulating film (40), the insulating film (40) wrapping the battery cells (20), a side of the insulating film (40) facing the bottom support (30) being provided with a third through hole (41) and a fourth through hole (42).

16. The battery according to claim 15, characterized in that the orthographic projections of the third through hole (41) and the fourth through hole (42) towards the bottom support (30) are respectively a fourth orthographic projection coinciding with at least part of the first through hole (31) and a fifth orthographic projection coinciding with at least part of the second through hole (32).

17. The battery according to claim 16, characterized in that the area of the first through hole (31) coincides with the area of the third through hole (41), the fourth orthographic projection coincides completely with the first through hole (31) and/or the area of the second through hole (32) coincides with the area of the fourth through hole (42), the fifth orthographic projection coincides completely with the second through hole (32).

18. The battery according to claim 16, characterized in that the fourth orthographic projection is not coincident with a portion of the first through hole (31) and the fifth orthographic projection is not coincident with a portion of the second through hole (32).

19. The battery according to claim 15, wherein the insulating film (40) is formed with an accommodation space (43), and at least part of the battery cell (20) is located in the accommodation space (43).

20. The battery according to claim 15, wherein the insulating film (40) is fixedly connected to the bottom support (30).

21. The battery according to claim 20, wherein the insulating film (40) is thermally fused fixedly connected to the bottom support (30).

22. The battery according to any one of claims 1 to 4, wherein one of the first through hole (31) and the second through hole (32) is a circular hole, and the other is a kidney-shaped hole.

23. The battery according to any one of claims 1 to 4, wherein the battery case (10) includes a cover plate (15), and the liquid injection hole (11) is provided on the cover plate (15).