CN212461916U

CN212461916U - Battery shell, battery module and power battery

Info

Publication number: CN212461916U
Application number: CN202020987018.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Current assignee: Evergrande New Energy Technology Shenzhen Co Ltd
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-02-02
Anticipated expiration: 2030-06-02

Abstract

The utility model relates to the technical field of power batteries, and provides a battery shell, a battery module and a power battery, wherein the battery shell comprises a frame body, the frame body comprises a shell body and a cover body, the cover body is arranged on the shell body in a covering manner, the shell body comprises two first side plates which are oppositely arranged, and the cover body comprises two second side plates which are oppositely arranged; the first side plate is matched with the second side plate; the inner wall of the second side plate is provided with a first step part, and the first step part is provided with a first abutting surface and a first connecting surface opposite to the outer wall of the first side plate at the corresponding side; the joint of the first side plate and the second side plate is provided with a connecting structure matched with the first abutting surface and the first connecting surface; above-mentioned battery case shell effectively avoids welding the highlight to enter into the framework inside and cause the damage to electric core unit, simultaneously, effectively reduces the adverse effect of stress to the welding position through adopting face and face welded mode, effectively improves structural strength, and the reliability is better, effectively plays the guard action to electric core unit.

Description

Battery shell, battery module and power battery

Technical Field

The utility model relates to a power battery technical field especially provides a battery case, battery module and power battery.

Background

Along with new forms of energy industry development, electric automobile obtains popularizing gradually, and electric automobile's power mainly is provided by power battery, and power battery includes a plurality of battery module usually, and the battery module includes battery case and a plurality of electric core unit usually, and the equal holding of each electric core unit is in battery case to play the guard action to each electric core unit.

At present, a battery shell is generally formed by welding through a laser welding process, however, the structural strength of the welded battery shell is low, light leakage is easy to occur in the welding process, and strong light irradiates each cell unit to easily cause overheating damage of the cell unit, so that the reliability of the traditional battery shell is poor.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a battery case, battery module and power battery aim at solving the relatively poor technical problem of current battery case reliability.

In order to achieve the above object, the utility model adopts the following technical scheme: a battery shell comprises a frame body, wherein the frame body comprises a shell body and a cover body covering the shell body, the shell body comprises two first side plates which are arranged oppositely, and the cover body comprises two second side plates which are arranged oppositely;

the first side plate is matched with the second side plate;

the inner wall of the second side plate is provided with a first step part, and the first step part is provided with a first abutting surface and a first connecting surface opposite to the outer wall of the first side plate at the corresponding side;

the joint of the first side plate and the second side plate is provided with a connecting structure matched with the first abutting surface and the first connecting surface.

The utility model provides a battery case has following beneficial effect at least: the first connecting surfaces are welded with the outer wall surfaces of the corresponding first side plates, and one side edge of each first side plate close to the cover body is attached to the corresponding first abutting surface, so that strong light generated in the welding process is effectively prevented from entering the frame body, and the electric core units accommodated in the frame body are effectively prevented from being damaged by the strong welding light; meanwhile, compared with the traditional mode of welding at the corner positions of the cover body and the shell body, the mode of welding surface to surface effectively reduces the adverse effect of stress on the welding part, and effectively improves the connection stability of the shell body and the cover body, thereby improving the structural strength of the frame body; therefore, the battery shell has good reliability and effectively plays a role in protecting the battery cell unit.

In one embodiment, the first side plate is provided with a second step portion for being embedded with the corresponding first step portion, the second step portion is provided with a second connecting surface opposite to the second side plate on the corresponding side, and the first connecting surface is correspondingly connected with the second connecting surface.

By adopting the technical scheme, after the first step parts and the second step parts are correspondingly embedded, the first connecting surfaces and the second connecting surfaces are correspondingly welded, so that the outer wall surfaces of the welded first side plates are flush with the outer wall surfaces of the corresponding second side plates, and the integrity of the frame body is effectively improved.

In one embodiment, the battery case further includes two end plates, and the end plates are respectively covered on the two opening ends of the frame body.

Through adopting above-mentioned technical scheme, both end plates enclose jointly with the framework and connect the holding chamber that forms and be used for holding electric core unit, effectively realize battery case's whole sealed.

In one embodiment, the end plate comprises a plate body and a protruding portion arranged on one side of the plate body close to the frame body, the outer circumferential wall surface of the protruding portion is attached to the inner wall surface of the frame body, and the plate body is correspondingly connected with the end portion of the frame body.

Through adopting above-mentioned technical scheme, correspond two open ends that insert the framework with two bulges after, correspond two plate bodies and the both ends of framework and weld, laminate mutually through the periphery wall of two bulges and the internal face of framework, effectively block that the produced highlight of welding process enters into inside the framework to avoid welding the highlight to cause the damage to electric core unit, further improved battery case's reliability.

In one embodiment, the height difference between the peripheral wall of the protrusion and the peripheral edge of the corresponding plate is equal to the thickness of the wall of the frame.

Through adopting above-mentioned technical scheme, accomplish the welding back at two plate bodys and framework, the periphery of two plate bodys all with the outer wall parallel and level of framework to effectively improve the wholeness of framework.

In one embodiment, the end plate is provided with a reinforcing rib, and the reinforcing rib extends from one first side plate to the other first side plate.

Through adopting above-mentioned technical scheme, effectively improve the structural strength of each end plate to above-mentioned battery case's reliability has further been improved.

In one embodiment, the housing is made of a polymer material.

Through adopting above-mentioned technical scheme, effectively reduce battery case's whole quality to improve battery module's quality energy density.

In order to achieve the above object, the utility model also provides a battery module, including a plurality of electric core units and above-mentioned battery case, each electric core unit homogeneous holding is in battery case.

Since the battery module employs all embodiments of the battery housing, at least all beneficial effects of the embodiments are achieved, and are not described in detail herein.

In order to achieve the above object, the utility model also provides a power battery, including a plurality of above-mentioned battery module.

Since the power battery adopts all the embodiments of the battery module, at least all the advantages of the embodiments are achieved, and no further description is given here.

In one embodiment, the power battery further comprises a tray, connecting columns are arranged on two end plates of a battery shell of each battery module, and each connecting column is connected with the tray through a fastener.

Through adopting above-mentioned technical scheme, effectively improve the installation steadiness of each battery module to improve power battery's reliability.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.

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

fig. 2 is an exploded view of the battery case shown in fig. 1;

FIG. 3 is a schematic view of the battery case of FIG. 1 with two end plates removed;

fig. 4 is an enlarged schematic view of the battery case shown in fig. 3 at a;

FIG. 5 is a schematic structural view of a case of the battery case shown in FIG. 1;

fig. 6 is a schematic structural view of a cover of the battery case shown in fig. 1.

Wherein, in the figures, the respective reference numerals:

10. the frame body, 11, the casing, 111, first curb plate, 1111, second step portion, 1112, second connection face, 1113, second conflict face, 112, roof, 12, lid, 121, second curb plate, 1211, first step portion, 1212, first connection face, 1213, first conflict face, 122, bottom plate, 20, end plate, 21, plate body, 22, bulge, 23, strengthening rib, 24, spliced pole.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "top", "bottom", "inside", "outside", and the like refer to the orientation or positional relationship shown in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Here, the "outer wall surface" refers to a wall surface of the case or the cover facing away from the cell unit, and the "inner wall surface" refers to a wall surface of the case or the cover facing the cell unit.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected" and "connecting" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, or an integral part; 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 according to specific situations by those skilled in the art.

Referring to fig. 1 to 6, a battery casing includes a frame 10, the frame 10 includes a casing 11 and a cover 12 covering the casing 11, the casing 11 includes two first side plates 111 disposed oppositely, the cover 12 includes two second side plates 121 disposed oppositely, the first side plates 111 are adapted to the second side plates 121, the inner walls of the second side plates 121 are provided with first step portions 1211, each first step portion 1211 has a first abutting surface 1213 and a first connecting surface 1212 opposing to the outer wall of the corresponding first side plate 111, and a connecting structure matching the first abutting surface 1213 and the first connecting surface 1212 is disposed at the connecting position of the first side plate 111 and the second side plate 121.

In the battery case, the first connecting surface 1212 is welded to the outer wall surface of the corresponding first side plate 111, and one edge of each first side plate 111 close to the cover 12 is attached to the corresponding first abutting surface 1213, so that strong light generated in the welding process is effectively prevented from entering the frame 10, and thus the damage of the welding strong light to the electric core unit accommodated in the frame 10 is effectively avoided; meanwhile, compared with the traditional mode of welding at the corner positions of the cover body 12 and the shell body 11, the mode of surface-to-surface welding effectively reduces the adverse effect of stress on the welding position, and effectively improves the connection stability of the shell body 11 and the cover body 12, thereby improving the structural strength of the frame body 10; therefore, the battery shell has good reliability and effectively plays a role in protecting the battery cell unit.

Specifically, as shown in fig. 1 to fig. 6, the housing 11 further includes a top plate 112, and the two first side plates 111 are respectively connected to two opposite sides of the top plate 112; the cover 12 further includes a bottom plate 122, and two second side plates 121 are respectively connected to two opposite sides of the bottom plate 122.

In the present embodiment, as shown in fig. 1 to fig. 6, the first side plate 111 has a second step portion 1111 for being engaged with the corresponding first step portion 1211, the second step portion 1111 has a second connection surface 1112 opposite to the corresponding second side plate 121, and each first connection surface 1212 is connected to each second connection surface 1112 correspondingly. After the first stepped portions 1211 and the second stepped portions 1111 are correspondingly fitted, the first connecting surfaces 1212 and the second connecting surfaces 1112 are correspondingly welded, so that the outer wall surfaces of the welded first side plates 111 are flush with the outer wall surfaces of the corresponding second side plates 121, and the integrity of the frame 10 is effectively improved.

Specifically, as shown in fig. 1 to fig. 6, each of the second step portions 1111 further has a second abutting surface, the second abutting surface 1113 is perpendicularly joined to the second connecting surface 1112, and an edge of each of the second side plates 121 close to the housing 11 is abutted to the corresponding second abutting surface 1113. After the first connecting surface 1212 and the second connecting surface 1112 are welded, an edge of one side of each second side plate 121 close to the housing 11 is attached to the corresponding second abutting surface 1113, so as to effectively improve the sealing performance of the battery case.

In this embodiment, please refer to fig. 1 and fig. 2, the battery case further includes two end plates 20, and the end plates 20 are respectively disposed at two opening ends of the frame 10 correspondingly. Specifically, the casing 11 and the cover 12 enclose to form the two opening ends, the two end plates 20 respectively correspond to the covers and are disposed at the two opening ends, and the two end plates 20, the casing 11 and the cover 12 jointly enclose to form an accommodating cavity for accommodating the cell unit, so that the overall sealing of the battery case is effectively realized.

Specifically, as shown in fig. 1 and fig. 2, the end plate 20 includes a plate body 21 and a protruding portion 22 disposed on one side of the plate body 21 close to the frame body 10, an outer peripheral wall surface of the protruding portion 22 is attached to an inner wall surface of the frame body 10, the plate body 21 is correspondingly connected to an end portion of the frame body 10, that is, the outer peripheral wall surfaces of the protruding portions 22 are both attached to inner wall surfaces of the housing 11 and the cover body 12, and two end portions of the plate body 21 and the housing 11 are correspondingly welded to two end portions of the cover body 12. After the two protruding parts 22 are correspondingly inserted into the two opening ends of the frame body 10, the two plate bodies 21 are correspondingly welded with the two end parts of the frame body 10, and the peripheral wall surfaces of the two protruding parts 22 are attached to the inner wall surface of the frame body 10, so that strong light generated in the welding process is effectively prevented from entering the frame body 10, the electric core unit is prevented from being damaged by the strong welding light, and the reliability of the battery shell is further improved.

Specifically, as shown in fig. 1 and fig. 2, in order to further reduce the mass of the battery case and improve the mass energy density of the battery module, the protruding portion 22 has a ring structure, such as a square ring structure or a circular ring structure.

Specifically, the difference in height between the outer peripheral wall of the projection 22 and the peripheral edge of the corresponding plate body 21 is equal to the thickness of the wall body of the frame body 10. It should be emphasized that the difference in height "equal to the wall thickness of the frame" is not limited to being exactly the same as the difference in wall thickness, but means that the difference in height and the wall thickness of the frame are compatible with each other under such settings, and it is understood by those skilled in the art that certain dimensional tolerances of the mechanical assembly structure are allowable in the manufacturing design. After the two plate bodies 21 and the frame body 10 are welded, the peripheries of the two plate bodies 21 are flush with the outer wall surface of the frame body 10, so that the integrity of the frame body 10 is effectively improved.

Specifically, as shown in fig. 1 and fig. 2, the end plate 20 is provided with a reinforcing rib 23, and the reinforcing rib 23 extends from one first side plate 111 to the other first side plate 111. Specifically, the reinforcing ribs 23 are provided on the side of the plate body 21 away from the protruding portion 22, and by providing the reinforcing ribs 23 on each end plate 20, the structural strength of each end plate 20 is effectively improved, thereby further improving the reliability of the battery case.

In this embodiment, the case 11 is made of a polymer material, and the case 11 made of a polymer material is used to effectively reduce the overall mass of the battery case, thereby improving the mass energy density of the battery module. The polymer material is not particularly limited, and may be various materials such as glass fiber, rubber, resin, and the like.

The utility model provides a battery module, includes a plurality of electric core units and above-mentioned battery case, and each electric core unit all holds in battery case.

A power battery comprises a plurality of battery modules.

In this embodiment, please refer to fig. 1 and fig. 2, the power battery further includes a tray (not shown), the two end plates 20 of the battery housing of each battery module are respectively provided with a connection column 24, and each connection column 24 is connected to the tray through a fastener. The connecting columns 24 of the end plates 20 are connected to the tray by using the fasteners, so that the battery modules are fixedly mounted on the tray, the mounting stability of the battery modules is effectively improved, and the reliability of the power battery is improved.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a battery shell, includes the framework, the framework includes that casing and lid are located lid on the casing, the casing includes two first curb plates of relative setting, the lid includes two second curb plates of relative setting, its characterized in that:

the first side plate is matched with the second side plate;

2. The battery case of claim 1, wherein: the first side plate is provided with a second step part which is embedded with the corresponding first step part, the second step part is provided with a second connecting surface which is opposite to the second side plate at the corresponding side, and the first connecting surface is correspondingly connected with the second connecting surface.

3. The battery case of claim 1, wherein: the battery shell further comprises two end plates, and the end plates are correspondingly covered at two opening ends of the frame body respectively.

4. The battery case of claim 3, wherein: the end plate comprises a plate body and a protruding part arranged on one side, close to the frame body, of the plate body, the peripheral wall surface of the protruding part is matched with the inner wall surface of the frame body, and the plate body is correspondingly connected with the end part of the frame body.

5. The battery case of claim 4, wherein: the height difference between the peripheral wall of the convex part and the corresponding peripheral edge of the plate body is equal to the thickness of the wall body of the frame body.

6. The battery case of claim 3, wherein: the end plate is provided with a reinforcing rib, and the reinforcing rib extends from one first side plate to the other first side plate.

7. The battery housing of any of claims 1-6, wherein: the shell is made of high polymer materials.

8. A battery module, its characterized in that: comprising a plurality of cell units and a battery housing according to any of claims 1 to 7, each of the cell units being housed within the battery housing.

9. A power battery, characterized by: comprising a plurality of battery modules according to claim 8.

10. The power cell of claim 9, wherein: the power battery further comprises a tray, connecting columns are arranged on two end plates of a battery shell of each battery module, and each connecting column is connected with the tray through a fastener.