CN209896117U

CN209896117U - End plate and battery module

Info

Publication number: CN209896117U
Application number: CN201920019098.3U
Authority: CN
Inventors: 温世标; 程志刚; 王华文
Original assignee: Sunwoda Electric Vehicle Battery Co Ltd
Current assignee: Xinwangda Power Technology Co ltd
Priority date: 2019-01-07
Filing date: 2019-01-07
Publication date: 2020-01-03
Anticipated expiration: 2029-01-07

Abstract

The utility model provides an end plate and battery module, including a plurality of lightening holes, each lightening hole runs through the end plate along the end plate direction of height, there is at least one triangle brace diagonal in a plurality of lightening holes, has strengthened the structural strength of end plate greatly; the one side that the end plate is close to the battery is equipped with contact frame and buffering concave arc, and in battery module application, when battery module produced the bulging force, buffering concave arc with clearance that exists between the battery can just in time absorb the bulging force, still including setting up the arc structure and the obtuse angle structure on end plate thickness both sides limit, the curb plate with when the end plate is connected, the obtuse angle structure part that falls with the curb plate can not contact, can increase the electric clearance between the battery to further promote the security and the reliability of end plate, just can the shaping through basic extrusion and machining process moreover, simple process, easily operation, material selectivity is strong.

Description

End plate and battery module

Technical Field

The utility model relates to a power battery system technical field especially relates to an end plate and battery module.

Background

With the rapid development of new energy industry, electric vehicles are receiving much attention, and the battery module is a core component of the electric vehicle and a power source of the electric vehicle. The general battery module comprises a plurality of battery monomer and module component, and the module component mainly includes two end plates, two curb plates, upper cover and insulating piece, and end plate and curb plate enclose into frame structure through the mode of welding or lock screw, and the insulating piece is placed between end plate and the battery that corresponds. Generally, the end plate is of a flat plate structure formed by extrusion of aluminum materials, the flat surface is tightly attached to the battery, then a large pretightening force is applied to the battery, so that the battery is tightly attached to the battery, when the expansion force generated by the battery module in the using process is completely acted on the flat surface of the flat plate, only a part of the expansion force can be absorbed due to the large rigidity of the end plate, most of the expansion force residues can be directly acted on a welding line, and when the expansion force exceeds the strength of the welding line, the welding line can be damaged, so that the battery module fails; or remaining bulging force makes the mounting hole of end plate produce the skew, and when the offset reached a certain amount, the screw can receive the exogenic action, leads to the screw fracture to make battery module inefficacy. Therefore, the conventional battery module generally has the problems of low structural strength and poor long-term reliability.

In order to solve the above problems, chinese patent CN 207441760U discloses an end plate and a battery module, where the end plate has a plurality of lightening holes, each lightening hole is located at one side of the thickness direction of the end plate and penetrates through the end plate in the height direction, and at least one buffer cavity is located at the other side of the thickness direction of the end plate and penetrates through the end plate in the height direction. The end plate has a strong rigidity at one side in the thickness direction with the lightening holes, and has an energy absorbing characteristic at one side in the thickness direction with the cushion chamber. When the end plate is applied to the battery module, the large surface of the end plate close to the buffer cavity faces the battery module, and along with the expansion deformation of each battery, the end plate on one side with the buffer cavity generates elastic or plastic deformation to absorb the expansion force, so that the deformation of the appearance of the whole battery module caused by the expansion force of each battery is greatly reduced. But the requirement on the material is high, the material has both strong rigidity and energy absorption characteristic, and the process is complex and difficult to control in the die opening process; chinese patent CN 205828488U discloses a battery end plate and a battery module, which includes: a first end plate and a second end plate; the contact surface of the first end plate faces the battery, and the second end plate is arranged between the battery and the first end plate; the first surface of the second end plate is contacted with the battery, and the second surface of the second end plate is contacted with the contact surface of the first end plate; the contact surface at first end plate is provided with first buffering concave arc, and first buffering concave arc is the arc structure groove of sinking to the direction of keeping away from the battery, sets up first buffering concave arc through the contact surface at first end plate for first end plate and second end plate are changeed and are joined in marriage the completion back, can produce the pressure that the buffering clearance absorbed the battery inflation production, reduce because of the battery inflation and to the harm that the battery end plate caused, improve the security that the battery module used. However, the end plate includes a first end plate and a second end plate, and the first end plate is required to have rigidity, and the second end plate has elasticity, and when the battery module is subjected to a large impact, the combination of the two end plates is likely to be deformed or dislocated by force, and the structural strength is further improved. In addition, in the above two methods, the end plate and the side plate are directly welded or fastened by a locking screw, and the electric gap between the batteries is not considered.

Disclosure of Invention

In order to solve the technical problems, the invention provides the end plate and the battery module, which have simple structures and simple processes, can improve the reliability and the structural strength of the end plate, and also increase the electrical clearance of the battery module.

The invention provides an end plate which comprises a plurality of lightening holes, wherein each lightening hole penetrates through the end plate along the height direction of the end plate, and at least one triangular inclined rib is arranged in each lightening hole;

as a further improvement of the present invention, one side of the end plate close to the battery assembly includes a contact frame and a buffer concave arc, both the contact frame and the buffer concave arc are disposed on one side close to the battery assembly, and the contact frame is disposed on the frame in the height direction of the end plate; the buffer concave arcs are distributed in the space of the end plate except the contact frame.

As a further improvement, the thickness both sides limit of end plate still includes convex structure and obtuse angle structure, the obtuse angle structure is located the part that is close to the battery, convex structure is located the part of keeping away from the battery.

As a further improvement, the end plate structure can be an integrated structure or a composite splicing structure made of multiple materials.

The invention also comprises a battery module which comprises two end plates, two side plates, an isolation plate, an upper cover and a plurality of battery cell insulation sheets, wherein the two end plates and the side plates are enclosed to form an accommodating cavity for accommodating a battery assembly formed by connecting a plurality of battery monomers in series and in parallel, the battery cell insulation sheets are distributed between every two batteries, and the upper cover covers the accommodating cavity.

Further, the end plate is not in complete contact with the battery assembly, the contact frame is in contact with the edge of the battery, and a certain gap is formed between the buffer concave arc and the battery assembly.

Furthermore, a clamping groove is further formed in the end plate and used for installing the protective cover.

Further, the end plate may be made of aluminum, steel, or an alloy material.

Has the advantages that:

the utility model provides an end plate and battery module, a plurality of lightening holes have a triangle brace to one side at least, have promoted the structural strength of end plate greatly; the battery module comprises an end plate and a battery, wherein one side of the end plate, which is close to the battery, comprises a contact frame and a buffer concave arc, an arc-shaped gap between the buffer concave arc and the battery can just absorb an expansion force when the battery module generates the expansion force, and the parts, which are close to the battery, of two side edges of the thickness of the end plate are provided with inverted obtuse angle structures, so that the electrical gap between the batteries can be increased, and the safety and the reliability of the end plate are further improved.

Drawings

FIG. 1 is a schematic structural view of the end plate of the present invention

FIG. 2 is a top view of the end plate of the present invention

FIG. 3 is a schematic view of the structure of the end plate of the present invention near one side of the battery assembly

Fig. 4 is a perspective view of the battery module of the present invention

FIG. 5 is an exploded view of FIG. 4

Wherein the reference numerals are as follows:

1 end plate

2 Battery assembly

3 side plate

4 upper cover

11 lightening hole

11a triangle inclined rib lightening hole

12 buffer concave arc

13 contact frame

14-obtuse-angle structure

15 arc structure

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.

In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like are used for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

In the description of the present invention, it should be further noted that, unless explicitly stated or limited in the art, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections, either direct connections or indirect connections through intervening media. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.

For better understanding of the present invention, a battery module according to an embodiment of the present invention will be described in detail below with reference to fig. 1 to 5.

Referring to fig. 1 to 4, an end plate 1 according to the present invention includes a plurality of lightening holes 11, each lightening hole 11 penetrating through the end plate 1 in a height direction of the end plate 1; at least one of the plurality of lightening holes 11 is a triangular inclined rib 11 a; one surface of the end plate 1 close to the battery assembly 2 comprises a contact frame 13 and a buffer concave arc 12, wherein the contact frame 13 is arranged on the frame of the end plate 1 in the height direction and is abutted against the edge of the battery assembly 2; the buffer concave arcs 12 are distributed in the space of the end plate 1 except the contact frame 13; the battery end plate is characterized by further comprising circular arc-shaped structures 15 and inverted angle structures 14 on two sides of the thickness direction of the end plate, the inverted angle structures 14 are located on the portions close to the battery assembly 2, the circular arc-shaped structures 15 are arranged on the portions far away from the battery assembly 2, and the end plate 1 can be of an integrated structure or a composite splicing structure made of multiple materials.

In the present embodiment, 7 of the plurality of lightening holes 11 on the end plate 1 are lightening holes 11a in the shape of a triangular oblique rib, and we know that the triangular structure is the most stable structure, so the use of the triangular oblique rib in the present embodiment can enhance the structural strength of the end plate 1.

As shown in fig. 4 and 5, in the present embodiment, the contact frame 13 on the end plate 1 abuts against the frame of the battery assembly 1, the buffer concave arc 12 does not contact the battery module 2, when the end plate 1 and the side plate 3 are fitted to the battery assembly 2, it can be seen that the contact surface of the end plate 1 and the battery assembly 2 is not completely contacted, and a certain gap is formed between the battery assembly 2 and the buffer concave arc 12, and during the use of the battery module, along with the expansion and deformation of each battery, the gap between the battery assembly 2 and the buffer concave arc 12 can absorb the expansion force generated by the expansion force, thereby greatly reducing the deformation of the whole battery module due to the expansion force of each battery, and improving the structural strength and reliability of the battery module.

In this embodiment, the two sides of the thickness direction of the end plate 1 further include an arc-shaped structure 15 and an obtuse angle structure 14, the obtuse angle structure 14 is located at a portion close to the battery assembly 2, the arc-shaped structure 15 is located at a portion far away from the battery assembly 2, the obtuse angle structure 14 and the arc-shaped structure 15 are of an integrated structure, that is, the obtuse angle structure 15 is formed by cutting off a portion of the arc-shaped structure 15 along the height direction of the end plate 1, when the side plate 3 is connected with the end plate 2, the arc-shaped structure 15 is tightly attached to the side plate 3, and a certain gap exists between the obtuse angle structure 14 and the side plate 3, so that the electrical gap between the batteries is increased, and the safety and the reliability of the battery module are further improved.

Further, the material of the end plate 1 may be aluminum, steel, or an alloy material.

Furthermore, the end plate 1 can be formed by extrusion forming and machining processes, and the process is simple and easy to operate.

Further, the structure of the end plate 1 may be an integrated structure, or may be a composite splicing structure of multiple materials.

As shown in fig. 4, the battery module 2 further includes two end plates 1, two side plates 3, an upper cover 4 and a plurality of electric core insulation sheets, the two end plates 1 and the two side plates 3 are enclosed to form a containing cavity, a battery assembly 2 formed by connecting a plurality of single batteries in series and parallel is contained, the electric core insulation sheets are distributed between every two batteries 2, and the upper cover 4 covers the containing cavity to form the battery module 2.

It should be noted that the size of the lightening hole 11, the radian 12 of the buffering concave arc, the width 13 of the frame, and different materials all affect the ability of the end plate 1 to absorb the expansive force, so in specific applications, the sizes of the components of the end plate 1 need to be designed reasonably by combining the application scene of the battery module, the structural parameters of the battery module, and other values.

Claims

1. The utility model provides an end plate, includes a plurality of lightening holes, and each lightening hole runs through end plate, its characterized in that along end plate direction of height: the lightening hole is provided with at least one triangular oblique rib, and further comprises a contact frame and a buffer concave arc which are arranged on one surface close to the battery module, and an arc-shaped structure and an inverted obtuse angle structure which are arranged on two sides of the thickness of the end plate.

2. An end panel according to claim 1, wherein said contact frame is provided on a frame in the height direction of said end panel.

3. The end plate of claim 1, wherein the buffer concave arcs are distributed in a space of the end plate except for the contact frame, and the buffer concave arcs are not in contact with the battery module.

4. The end plate of claim 1, wherein the obtuse angled structure is located at a portion close to the battery assembly, the circular arc structure is located at a portion far from the battery assembly, and the circular arc structure and the obtuse angled structure are of a single-piece structure.

5. An end panel according to claim 1, wherein the end panel structure is a unitary structure or a composite splice of multiple materials.

6. A battery module, wherein the end plates in the battery module comprise all of the features of claims 1-5.