CN213150900U

CN213150900U - Power battery shell structure and power battery

Info

Publication number: CN213150900U
Application number: CN202021854465.0U
Authority: CN
Inventors: 励建炬; 邱宜升; 吴林峰; 刘勇
Original assignee: Shenzhen Kedali Industry Co ltd
Current assignee: Shenzhen Kedali Industry Co ltd; Shenzhen Kedali Ind Co Ltd
Priority date: 2020-08-28
Filing date: 2020-08-28
Publication date: 2021-05-07
Anticipated expiration: 2030-08-28

Abstract

The utility model discloses a power battery shell structure and power battery belongs to the power battery field. The power battery shell structure comprises a shell, a protective layer and a stainless steel top cover. The housing is made of aluminum. The protective layer is arranged on the inner wall of the shell and is made of stainless steel, and steps are formed on the inner wall of the protective layer. The stainless steel top cover is arranged at the position of the mounting groove opening and attached to the inner wall of the protective layer, and the stainless steel top cover is used for mounting the electrode and the explosion-proof valve. The power battery shell structure can reduce the rupture phenomenon of the shell structure caused by the electrochemical corrosion problem in the power battery, improve the strength of the shell structure and improve the assembly safety of the power battery shell structure.

Description

Power battery shell structure and power battery

Technical Field

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

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a power battery shell structure can avoid the wire to take place the short circuit and reduce shell structure because the rupture phenomenon that the inside electrochemical corrosion problem of power battery leads to improves shell structure's intensity.

Another object of the present invention is to provide a power battery, which can avoid the short circuit of the metal wire and improve the strength of the power battery, and reduce the possibility of the damage of the power battery by the electrochemical corrosion.

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

a power cell housing structure comprising: a housing made of aluminum; the protective layer is arranged on the inner wall of the shell and is made of stainless steel, and steps are formed on the inner wall of the protective layer; the stainless steel top cover is arranged at the step and attached to the inner wall of the protective layer, and the stainless steel top cover is used for installing the electrode and the explosion-proof valve.

Further, the housing is formed with a mounting notch, the protective layer and the housing being flush with the mounting notch.

Furthermore, two inner walls of the protective layer, which are arranged oppositely, are respectively provided with an extension layer, and the top wall of the extension layer forms the step.

Furthermore, an inclined peripheral surface is formed on the peripheral surface of one end of the stainless steel top cover in the thickness direction, the cross-sectional area of the stainless steel top cover is gradually reduced along the direction towards the bottom of the mounting groove opening, and the inclined peripheral surface abuts against the step.

Further, the top surface of the stainless steel top cover is flush with the mounting slot.

Further, the periphery wall of the stainless steel top cover is connected with the protective layer in a welding mode.

Furthermore, the stainless steel top cover is provided with two through holes arranged at intervals, and the through holes are used for installing electrodes.

Furthermore, a plurality of mounting protrusions which surround the central axis of the through hole and are uniformly distributed are arranged on the circumferential surface of the through hole.

Further, the shell and the protective layer are integrally formed.

A power battery comprises the power battery shell structure.

The utility model has the advantages that: the setting of inoxidizing coating can play better isolation effect between power battery's internal component and the casing, and stainless steel spare contains chromium simultaneously for stainless steel spare has better corrosion protection, thereby makes the internal component can't appear the electrochemical corrosion problem when power battery trouble and between the casing, and then avoids leading to the problem of battery failure because of the electrochemical corrosion phenomenon that appears between internal component and the casing. Through the setting of step, can be convenient for operating personnel install the top cap on the inoxidizing coating firmly to be convenient for assemble power battery shell structure, can improve assembly efficiency, can also improve shell structure's leakproofness. In addition, stainless steel spare has wrapped up the space of whole shell structure's installation notch, can further improve shell structure's bulk strength to improve power battery's life. Furthermore, the protective layer is made of stainless steel, so that the metal wire is difficult to scrape out when the top cover and the shell are assembled, the metal wire generated in the process of assembling the shell is prevented from falling into the shell, the possibility of battery explosion caused by short circuit of the power battery shell structure is obviously reduced, and the safe assembly of the power battery shell structure is further ensured.

The utility model discloses an another beneficial effect does: due to the power battery shell structure, short circuit of the metal wires can be avoided, the strength of the power battery is improved, and the possibility that the shell of the power battery is damaged by electrochemical corrosion is reduced.

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 power battery case structure 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 power battery case according to an embodiment of the present invention;

fig. 4 is a partially enlarged structural view at B in fig. 3.

Reference numerals

1. A housing; 11. installing a notch;

2. a protective layer; 21. a step; 22. an extension layer;

3. a stainless steel top cover; 31. a beveled peripheral surface; 32. a through hole; 33. 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 power battery case structure according to the embodiment of the present invention is described below with reference to fig. 1 to 4.

As shown in fig. 1-4, fig. 1 discloses a power battery shell structure, which comprises a shell 1, a protective layer 2 and a stainless steel top cover 3. The housing 1 is made of aluminum. The protective layer 2 is arranged on the inner wall of the shell 1, the protective layer 2 is made of stainless steel, and a step 21 is formed on the inner wall of the protective layer 2. The stainless steel top cover 3 is arranged at the position of the mounting notch 11 and attached to the inner wall of the protective layer 2, and the stainless steel top cover 3 is used for mounting an electrode and an explosion-proof valve.

It can be understood that the setting of inoxidizing coating 2 can play better isolation effect between power battery's internal component and the casing 1, and stainless steel spare contains chromium simultaneously for stainless steel spare has better corrosion protection, thereby makes the internal component can't appear the electrochemical corrosion problem when power battery trouble and between the casing 1, and then avoids leading to the problem of battery failure because of the electrochemical corrosion phenomenon that appears between internal component and the casing 1. Through the setting of step 21, can be convenient for operating personnel install the top cap on inoxidizing coating 2 firmly to be convenient for assemble power battery shell structure, can improve assembly efficiency, can also improve shell structure's leakproofness. In addition, stainless steel has wrapped up the space of whole shell structure's installation notch 11, can further improve shell structure's bulk strength to improve power battery's life. Furthermore, because the protective layer 2 is made of stainless steel, the metal wire is difficult to scrape out when the top cover is assembled with the shell 1, so that the metal wire generated in the assembling process of the top cover and the shell 1 is prevented from dropping into the shell 1, the possibility of battery explosion caused by short circuit of the power battery shell structure is remarkably reduced, and the safe assembly of the power battery shell structure is ensured.

Illustratively, the stainless steel member can be provided as a stainless steel membrane.

In some embodiments, as shown in fig. 4, the housing 1 is formed with a mounting slot 11, and the shield 2 and the housing 1 are flush with the mounting slot 11.

It will be appreciated that the flush arrangement of the armour layer 2 and the housing 1 with the mounting rebate 11 can facilitate the connection of the housing 1 with the stainless steel top cover 3.

In some embodiments, as shown in fig. 4, the two oppositely disposed inner walls of the protective layer 2 are respectively provided with an extension layer 22, and the top wall of the extension layer 22 forms a step 21.

It can be understood that, through the arrangement of the extension layer 22, the two oppositely-arranged inner walls of the protection layer 2 can be respectively provided with one step 21, so that the stainless steel top cover 3 can be stably arranged on the protection layer 2, and because the extension layer 22 is only arranged on the two oppositely-arranged inner walls of the protection layer 2, the influence on the thickness of the protection layer 2 and the corrosion prevention effect of the protection layer 2 when the step 21 is formed can be avoided, thereby reducing the arrangement cost of the extension layer 22.

In some embodiments, as shown in fig. 4, an inclined circumferential surface 31 is formed on a circumferential surface of one end of the stainless steel top cover 3 in the thickness direction, and on the inclined circumferential surface 31, the sectional area of the stainless steel top cover 3 is gradually reduced in a direction toward the bottom of the groove of the mounting slot 11, and the inclined circumferential surface 31 abuts on the step 21. It can be understood that, through the setting of oblique global 31, oblique global 31 butt can make stainless steel top cap 3 joint on installation notch 11 firmly on step 21, can avoid stainless steel top cap 3 to directly establish the phenomenon that relative displacement appears on inoxidizing coating 2 when on the roof of step 21 to be convenient for follow-up sealed with stainless steel top cap 3 and casing 1.

In some embodiments, as shown in fig. 1 and 4, the top surface of the stainless steel top cover 3 is flush with the mounting slot 11. It can be understood that, through the above-mentioned structural arrangement, the stainless steel top cover 3 and the shell 1 can be stably and hermetically connected, the aesthetic property of the shell structure is improved, and the possibility that the shell structure is damaged under the external action more easily because the stainless steel top cover 3 protrudes out of the notch or is lower than the notch can also be avoided.

In some embodiments, the outer peripheral wall of the stainless steel top cover 3 is welded to the shield layer 2. It can be understood that the periphery of the stainless steel top cover 3 is welded with the protective layer 2, so that the stainless steel top cover 3 can be stably connected with the protective layer 2, and the welding is also simple and convenient to complete from the mounting notch 11, thereby reducing the processing difficulty of the shell structure of the power battery and improving the processing convenience of the shell structure.

Optionally, in this embodiment, the welding between the stainless steel top cover 3 and the protective layer 2 adopts a laser welding process, and of course, in other embodiments of the present invention, other welding processes can also be used.

In some embodiments, as shown in fig. 4, the side wall of the stainless steel top cover 3 and the inner wall of the protective layer 2 have a gap therebetween before assembly, and are butted together after laser welding.

It can be understood that the clearance is arranged to be favorable to installing the stainless steel top cover 3 on the protective layer 2, and the stainless steel top cover 3 and the protective layer 2 are stably connected as a reserved space when the stainless steel top cover 3 and the protective layer 2 are welded, so that the sealing performance and the strength of the shell structure are improved.

In some embodiments, as shown in fig. 1 and 2, the stainless steel top cover 3 is provided with two through holes 32 arranged at intervals, and the through holes 32 are used for mounting electrodes.

In some embodiments, as shown in fig. 1 and 2, the circumferential surface of the through hole 32 is provided with a plurality of mounting protrusions 33 uniformly distributed around the central axis of the through hole 32.

It can be understood that the arrangement of a plurality of mounting protrusions 33 can be matched with the electrodes, so that the electrodes can be accurately mounted in the through holes 32, the mounting protrusions 33 can also play a limiting role, the electrodes are prevented from rotating on the stainless steel top cover 3, the mounting convenience of the shell structure is improved, and the safety of the shell structure during use is also improved.

In some embodiments, the housing 1 and the protective layer 2 are an integral part.

It can be understood that the integrated part can make the casing 1 and the protective layer 2 stably connected, so that a gap between the casing 1 and the protective layer 2 is avoided, and the possibility that internal elements of the power battery enter the gap between the casing 1 and the protective layer 2 and damage the casing 1 can also be avoided, so that the protective effect of the protective layer 2 is ensured, the corrosion problem of the casing 1 when the power battery fails is improved, the strength of a shell structure is improved, and the safety of the power battery is also improved.

Illustratively, the protective layer 2 can be formed on the inner wall of the housing 1 by a die forming process, i.e. the housing 1 and the protective layer 2 can be formed as an integral part.

Example (b):

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

The power battery shell structure of this embodiment includes casing 1, inoxidizing coating 2, stainless steel top cap 3. The housing 1 is formed with a mounting notch 11, and the housing 1 is made of aluminum. The protective layer 2 is arranged on the inner wall of the shell 1, the protective layer 2 is made of stainless steel, and a step 21 is formed on the inner wall of the protective layer 2, so that the protective layer 2 is flush with the shell 1 at the position of the mounting notch 11. Stainless steel top cap 3 is installed in mounting groove installation notch 11 department, pastes the inner wall that leans on inoxidizing coating 2, and stainless steel top cap 3 is used for installing electrode and explosion-proof valve.

The shell 1 and the protective layer 2 are integrally formed. Two oppositely arranged inner walls of the protective layer 2 are respectively provided with an extension layer 22, and the top wall of the extension layer 22 forms a step 21.

The stainless steel top cover 3 abuts on the step 21. An inclined peripheral surface 31 is formed on the peripheral surface of one end of the stainless steel top cover 3 in the thickness direction, the cross-sectional area of the stainless steel top cover 3 is gradually reduced on the inclined peripheral surface 31 in the direction toward the bottom of the installation slot 11, and the inclined peripheral surface 31 abuts against the step 21. The top surface of the stainless steel top cover 3 is flush with the mounting notch 11. The periphery of the stainless steel top cover 3 is welded with the protective layer 2. The side wall of the stainless steel top cover 3 and the inner wall of the protective layer 2 have a gap before assembly, and after laser welding, the two are in abutting connection. Be equipped with two through-holes 32 that the interval set up on the stainless steel top cap 3, through-hole 32 is used for installing the electrode, is equipped with a plurality of central axis evenly distributed's that encircle through-hole 32 mounting protrusion 33 on the global of through-hole 32.

A power battery comprises the power battery shell structure.

According to the utility model discloses power battery, owing to have the aforesaid power battery shell structure, can avoid the wire to take place the short circuit and improve power battery's intensity, reduce power battery's shell by the possibility that electrochemical corrosion damaged, prolonged power battery's life and improved power battery's safety in utilization.

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 power cell housing structure, comprising:

a housing (1), said housing (1) being made of aluminum;

the protective layer (2), establish in the protective layer (2) on the inner wall of casing (1), protective layer (2) are prepared by the stainless steel and are formed with step (21) on the inner wall of protective layer (2).

2. The power battery case structure according to claim 1, characterized in that the power battery case structure further comprises a stainless steel top cover (3), the stainless steel top cover (3) is mounted at the step (21) and abuts against the inner wall of the protective layer (2), and the stainless steel top cover (3) is used for mounting an electrode and an explosion-proof valve.

3. The power battery case structure according to claim 2, wherein the case (1) is formed with a mounting notch (11), and the protective layer (2) and the case (1) are flush with the mounting notch (11).

4. The power battery shell structure according to claim 3, characterized in that the two oppositely arranged inner walls of the protective layer (2) are respectively provided with an extension layer (22), and the top wall of the extension layer (22) forms the step (21).

5. The power battery case structure according to claim 3, wherein an inclined peripheral surface (31) is formed on a peripheral surface of one end of the stainless steel top cover (3) in a thickness direction, and on the inclined peripheral surface (31), a sectional area of the stainless steel top cover (3) is gradually reduced in a direction toward a groove bottom of the mounting groove (11), and the inclined peripheral surface (31) abuts on the step (21).

6. The power battery shell structure according to claim 2, characterized in that the outer peripheral wall of the stainless steel top cover (3) is welded with the protective layer (2).

7. The power battery shell structure according to claim 2, wherein the stainless steel top cover (3) is provided with two through holes (32) arranged at intervals, and the through holes (32) are used for installing electrodes.

8. The power battery case structure according to claim 7, wherein the circumferential surface of the through hole (32) is provided with a plurality of mounting protrusions (33) uniformly distributed around the central axis of the through hole (32).

9. The power battery casing structure according to claim 1, characterized in that the casing (1) and the protective layer (2) are an integral molding.

10. A power cell comprising the power cell housing structure of any one of claims 1-9.