CN213959064U

CN213959064U - Composite power battery shell and power battery

Info

Publication number: CN213959064U
Application number: CN202022679632.9U
Authority: CN
Inventors: 励建炬
Original assignee: Shenzhen Kedali Industry Co ltd
Current assignee: Shenzhen Kedali Industry Co ltd; Shenzhen Kedali Ind Co Ltd
Priority date: 2020-11-18
Filing date: 2020-11-18
Publication date: 2021-08-13
Anticipated expiration: 2030-11-18

Abstract

The utility model discloses a composite power battery shell and power battery, this composite power battery shell include inner shell layer, articulamentum and outer shell layer. The containing cavity inner shell layer is made of stainless steel. The connecting layer is arranged on the outer wall of the inner shell layer and is made of aluminum alloy. The outer shell layer is arranged on the outer wall of the connecting layer and is made of stainless steel. The inner shell layer can reduce metal wires generated during the assembly of the shell body, reduce the electrochemical corrosion inside the power battery, and the outer shell layer can effectively improve the overall rigidity of the shell body and prevent the expansion phenomenon of the shell body, so that the assembly safety and the use safety of the power battery shell body are improved.

Description

Composite power battery shell and power battery

Technical Field

The utility model relates to a power battery technical field especially relates to a composite power battery shell and power battery.

Background

The power battery shell in the prior art is usually made of aluminum, a metal wire is easily scraped when the top cover and the shell are assembled, and the metal wire falls into the battery, so that short circuit is easily caused, and the risk of battery explosion exists; in addition, if the inside of the battery fails during use, electrochemical reaction is easily generated between the internal element and the shell of the power battery, so that the battery can be out of work, the shell can be corroded and broken, and the strength of the shell is reduced. In addition, in the long-term use process of the power battery, certain pressure can be generated during charging and discharging of the power battery, the shell is easy to bulge under the long-term action of the pressure, and the power battery is easy to lose efficacy and the safety of the power battery is greatly reduced after the shell bulges.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a composite power battery shell can improve casing intensity, improves the safety in utilization of casing.

Another object of the utility model is to provide a composite power battery shell can have higher intensity and security performance.

For realizing the technical effect, the utility model discloses a composite power battery shell and power battery's technical scheme as follows:

a hybrid battery case, comprising: an inner shell layer, which is made of stainless steel; the connecting layer is arranged on the outer wall of the inner shell layer and is made of aluminum alloy; the outer shell layer is arranged on the outer wall of the connecting layer and is made of stainless steel.

Further, the inner shell layer, the connecting layer and the outer shell layer are integrally formed.

Further, the inner shell layer is formed with a containing cavity, and the inner shell layer, the connecting layer and the outer shell layer are flush at an opening of the containing cavity.

Furthermore, two inner walls of the inner shell layer, which are oppositely arranged, are respectively provided with a supporting layer, and the top wall of the supporting layer forms a step.

A power cell, comprising: the hybrid battery case described above; and the top cover is arranged at the opening of the accommodating cavity and is connected with the composite power battery shell.

Further, the top cover is made of stainless steel.

Further, the top cover is formed with an inclined peripheral surface on a peripheral surface of one end in a thickness direction, and on the inclined peripheral surface, a sectional area of the top cover is gradually reduced in a direction toward a bottom of the accommodating chamber.

Furthermore, the top cover is provided with a plurality of mounting ports, and the mounting ports are used for mounting the electrodes and the explosion-proof valve.

Furthermore, a plurality of mounting protrusions which are uniformly distributed around the central axis of the mounting opening are arranged on the circumferential surface of the mounting opening.

Further, the top cover is welded with the composite power battery shell.

The utility model has the advantages that: according to the utility model discloses a composite power battery shell, because the metal wire that produces when the inner shell can reduce the casing equipment reduces the inside electrochemical corrosion of power battery, the outer shell can effectively improve the bulk rigidity of casing, prevents the inflation phenomenon of casing to the equipment security and the safety in utilization of power battery casing have been improved.

The utility model discloses an another beneficial effect does: due to the composite power battery shell, short circuit of metal wires can be avoided, the strength of the power battery is improved, the possibility that the inner shell of the power battery is damaged by electrochemical corrosion is reduced, and the phenomenon that the outer shell of the power battery expands under the action of external force is prevented, so that the service life of the power battery is prolonged, and the use safety of the power battery is improved.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

FIG. 2 is a schematic view of a portion of the enlarged structure at A in FIG. 1;

fig. 3 is a schematic view of an internal structure of a hybrid battery case according to an embodiment of the present invention;

FIG. 4 is a schematic view of a portion of the enlarged structure at B in FIG. 3;

reference numerals

1. An inner shell layer; 11. an accommodating chamber; 2. a connecting layer; 3. an outer shell layer; 4. a support layer;

5. a top cover; 51. a beveled peripheral surface; 52. an installation port; 53. and (7) installing a bulge.

Detailed Description

In order to make the technical problem solved by the present invention, the technical solution adopted by the present invention and the technical effect achieved by the present invention clearer, the technical solution of the present invention will be further explained by combining the drawings and by means of the specific implementation manner.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

It will be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

The specific structure of the hybrid battery case and the power battery according to the embodiment of the present invention will be described with reference to fig. 1 to 4.

As shown in fig. 1 to 4, fig. 1 discloses a hybrid battery case including an inner case layer 1, a connection layer 2, and an outer case layer 3. The inner shell layer 1 is made of stainless steel. The connecting layer 2 is arranged on the outer wall of the inner shell layer 1, and the connecting layer 2 is made of aluminum alloy. The outer shell layer 3 is arranged on the outer wall of the connecting layer 2, and the outer shell layer 3 is made of stainless steel.

It can be understood that the inner shell layer 1 made of stainless steel can play a good role in isolating the internal elements of the power battery from the composite power battery shell, and the stainless steel contains chromium, so that the inner shell layer 1 can have good corrosion resistance, and the problem that the internal elements cannot be subjected to electrochemical corrosion with the shell when the power battery fails is solved, and the problem that the battery fails due to the electrochemical corrosion between the internal elements and the shell is solved. Simultaneously, because shell layer 3 is prepared by the stainless steel and forms, the stainless steel has better rigidity performance, when making the aluminum alloy that forms by the aluminum alloy preparation appear the deformation phenomenon, shell layer 3 also can not appear deformation thereupon, thereby make the casing can bear great external stress and hold the inside expansion pressure in chamber 11, can keep the original state under shell layer 3's restriction, and can not appear the bulging phenomenon along radially outwards holding chamber 11, thereby ensure to install monomer electricity core or module after in holding chamber 11, battery inefficacy or battery safety problem that produce by the casing bulging can not appear. In addition, because the inner shell layer 1 and the outer shell layer 3 are prepared by stainless steel, in the assembling process of the power battery, the composite power battery shell is not easy to wear and tear with other structures, so that metal wires generated by assembling are effectively reduced, the metal wires fall into the accommodating cavity 11 when the composite power battery shell is assembled, the possibility of battery explosion caused by short circuit of the composite power battery shell is obviously reduced, and the installation and assembly of the composite power battery shell are ensured.

According to the composite power battery shell of the embodiment, the inner shell layer 1 can reduce metal wires generated during the assembly of the shell, so that the electrochemical corrosion inside the power battery is reduced, and the outer shell layer 3 can effectively improve the overall rigidity of the shell and prevent the expansion phenomenon of the shell, so that the assembly safety and the use safety of the power battery shell are improved.

In some embodiments, the inner shell layer 1, the connecting layer 2 and the outer shell layer 3 are an integral part.

First, in the present invention, there are various methods for integrally forming the inner shell layer 1, the connecting layer 2 and the outer shell layer 3, for example, in some embodiments, the inner shell layer 1, the connecting layer 2 and the outer shell layer 3 can be integrally formed by injection molding, compression molding, hot pressing or other forming methods; for another example, in some embodiments, the inner shell layer 1, the connecting layer 2 and the outer shell layer 3 can be integrally formed by painting, gluing and other coating methods; for another example, in some embodiments, the inner shell layer 1, the connecting layer 2, and the outer shell layer 3 can be formed by an integrally cast process. That is, in the present embodiment, the method in which the inner shell layer 1, the connecting layer 2, and the outer shell layer 3 are formed as an integrally molded piece may be any integrally molding method. In the present embodiment, a structure in which the inner shell layer 1, the connection layer 2, and the outer shell layer 3 are not detachable is emphasized, rather than a process in which the inner shell layer 1, the connection layer 2, and the outer shell layer 3 are integrally formed. It can be understood that the utility model discloses an in the practical use of composite power battery shell, because inner shell layer 1, tie coat 2 and outer shell layer 3 are integrated into one piece spare, make inner shell layer 1, tie coat 2 and outer shell layer 3 be difficult to appear relative displacement, both ensured that outer shell layer 3 can be better prevent that deformation from appearing in the casing, also can improve inner shell layer 1's corrosion protection ability.

In some embodiments, as shown in fig. 4, the inner shell layer 1 is formed with a receiving cavity 11, and the inner shell layer 1, the connecting layer 2 and the outer shell layer 3 are flush at an opening of the receiving cavity 11.

It can be understood that the inner shell layer 1, the connecting layer 2 and the outer shell layer 3 are flush at the opening of the accommodating cavity 11, so that the assembly of the composite power battery shell is facilitated, and the assembly efficiency and the assembly convenience are improved.

In some embodiments, as shown in fig. 3 and 4, the two inner walls of the inner shell 1 are provided with a support layer 4, respectively, and the top wall of the support layer 4 forms a step.

It can be understood that, through the setting of the support layer 4, two inner walls of the inner shell layer 1 which are oppositely arranged can be respectively provided with a step, so that other structures of the power battery can be stably arranged on the inner shell layer 1, and because the support layer 4 is only arranged on the two inner walls of the inner shell layer 1 which are oppositely arranged, the influence on the thickness of the inner shell layer 1 and the corrosion prevention effect of the inner shell layer 1 can be avoided when the step is formed, thereby reducing the setting cost of the support layer 4.

As shown in fig. 1-4, the present invention also discloses a power battery, which comprises the composite power battery casing and the top cover 5. The top cover 5 is arranged at the opening of the accommodating cavity 11 and is connected with the composite power battery shell.

According to the utility model discloses power battery owing to have the compound power battery casing before, can avoid the wire to take place the short circuit, improves power battery's intensity, reduces power battery's inner shell and by the possibility that electrochemical corrosion damaged, prevents the phenomenon of the outer shell inflation of power battery under the exogenic action to power battery's life has been prolonged and power battery's safety in utilization has been improved.

In some embodiments, the top cover 5 is made of stainless steel.

It can be understood that the top cover 5 is made of stainless steel, which can further reduce the possibility of scraping metal wires during the assembly process of the power battery, and further improve the safe assembly of the power battery.

In some embodiments, as shown in fig. 4, the top cover 5 is formed with an inclined peripheral surface 51 on a peripheral surface of one end in the thickness direction, and on the inclined peripheral surface 51, the sectional area of the top cover 5 is gradually reduced in a direction toward the bottom of the housing chamber 11.

It can be understood that, through the setting of oblique global 51, oblique global 51 butt can make top cap 5 joint in the opening part that holds chamber 11 firmly on the step, can avoid top cap 5 to appear relative displacement's phenomenon on inner shell layer 1 when directly establishing on the roof of step to be convenient for follow-up with top cap 5 and compound power battery shell sealing.

In some embodiments, as shown in fig. 1-3, the top cover 5 is provided with a plurality of mounting openings 52, and the mounting openings 52 are used for mounting the electrodes and the explosion-proof valve.

In some embodiments, the circumferential surface of the mounting opening 52 is provided with a plurality of mounting protrusions 53 uniformly distributed around the central axis of the mounting opening 52.

It can be understood that, can understand, a plurality of installation arch 53's setting can with the electrode cooperation to be convenient for the electrode accuracy and install in the through-hole, installation arch 53 can also play limiting displacement simultaneously, prevents that the electrode from rotatory on top cap 5, has both improved power battery's installation convenience, has also improved the security when power battery uses.

In some embodiments, the top cover 5 is welded to the inner shell 1. It can be understood that the top cover 5 and the inner shell layer 1 are welded to enable the top cover 5 and the inner shell layer 1 to be stably connected, and welding is completed at an opening of the accommodating cavity 11 simply and conveniently, so that the processing difficulty of the power battery is reduced, and the assembly convenience of the power battery is improved.

Optionally, in this embodiment, the welding between the top cover 5 and the inner shell layer 1 is performed by a laser welding process, and of course, in other embodiments of the present invention, other welding processes can be used.

In some embodiments, as shown in fig. 4, the side wall of the top cover 5 and the inner wall of the inner shell 1 have a gap therebetween before assembly and abut against each other after laser welding.

It can be understood that the gap is formed, so that the top cover 5 can be conveniently installed on the inner shell layer 1, the top cover 5 can be stably connected with the inner shell layer 1 as a reserved space when the top cover 5 is welded with the inner shell layer 1, and the sealing performance and the strength of the power battery are improved.

Example (b):

a power battery according to an embodiment of the present invention will be described with reference to fig. 1 to 4.

The power battery of the present embodiment includes a composite power battery case and a top cover 5.

A hybrid battery housing, comprising: the inner shell layer 1 is formed with an accommodating cavity 11, and the inner shell layer 1 is made of stainless steel; the connecting layer 2 is arranged on the outer wall of the inner shell layer 1, and the connecting layer 2 is made of aluminum alloy; the outer shell layer 3, outer shell layer 3 is established on the outer wall of articulamentum 2, and outer shell layer 3 is prepared by the stainless steel. The inner shell layer 1, the connecting layer 2 and the outer shell layer 3 are integrally formed. The inner shell 1, the connecting layer 2 and the outer shell 3 are flush with each other at the opening of the receiving space 11. Two inner walls of the inner shell layer 1 which are oppositely arranged are respectively provided with a supporting layer 4, and the top wall of the supporting layer 4 forms a step.

The top cover 5 is arranged at the opening of the accommodating cavity 11 and is connected with the composite power battery shell. The top cover 5 is made of stainless steel. The top cover 5 is formed with an inclined peripheral surface 51 on a peripheral surface at one end in the thickness direction, and on the inclined peripheral surface 51, the sectional area of the top cover 5 is gradually reduced in a direction toward the bottom of the housing chamber 11. The top cover 5 is provided with a plurality of mounting ports 52, and the mounting ports 52 are used for mounting electrodes and explosion-proof valves. A plurality of mounting protrusions 53 are provided on the circumferential surface of the mounting opening 52 and are uniformly distributed around the central axis of the mounting opening 52. And the top cover 5 is welded with the composite power battery shell.

In the description herein, references to the description of "some embodiments," "other embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the preferred embodiment of the present invention, and for those skilled in the art, there are variations on the detailed description and the application scope according to the idea of the present invention, and the content of the description should not be construed as a limitation to the present invention.

Claims

1. A hybrid battery case, comprising:

the inner shell layer (1), the inner shell layer (1) is made of stainless steel;

the connecting layer (2) is arranged on the outer wall of the inner shell layer (1), and the connecting layer (2) is made of aluminum alloy;

the outer shell layer (3), establish outer shell layer (3) on the outer wall of articulamentum (2), outer shell layer (3) are prepared by the stainless steel and are formed.

2. The hybrid battery housing according to claim 1, characterized in that the inner shell layer (1), the connecting layer (2) and the outer shell layer (3) are an integrally formed piece.

3. The hybrid battery case according to claim 1, wherein the inner shell layer (1) is formed with a receiving cavity (11), the inner shell layer (1), the connection layer (2) and the outer shell layer (3) being flush at an opening of the receiving cavity (11).

4. The hybrid battery case according to claim 1, wherein a support layer (4) is provided on each of two inner walls of the inner shell layer (1) disposed opposite to each other, and a top wall of the support layer (4) forms a step.

5. A power cell, comprising:

the hybrid battery case of any one of claims 1-4;

and the top cover (5) is arranged at the opening of the composite power battery shell and is connected with the composite power battery shell.

6. The power cell according to claim 5, characterized in that the top cover (5) is made of stainless steel.

7. The power battery according to claim 5, characterized in that the top cover (5) is formed with an inclined peripheral surface (51) on the peripheral surface at one end in the thickness direction, and on the inclined peripheral surface (51), the cross-sectional area of the top cover (5) is gradually reduced in the direction toward the bottom of the hybrid battery case.

8. The power battery according to claim 5, wherein the top cover (5) is provided with a plurality of mounting openings (52), and the mounting openings (52) are used for mounting electrodes and explosion-proof valves.

9. The power battery according to claim 8, characterized in that the circumferential surface of the mounting opening (52) is provided with a plurality of mounting protrusions (53) uniformly distributed around the central axis of the mounting opening (52).

10. The power cell according to claim 5, characterized in that the top cover (5) is welded with the composite power cell housing.