CN219998378U

CN219998378U - Battery module

Info

Publication number: CN219998378U
Application number: CN202321395208.9U
Authority: CN
Inventors: 孙海明; 叶云清; 罗懿; 蒋远富; 徐超强
Original assignee: Cornex New Energy Co ltd
Current assignee: Cornex New Energy Co ltd
Priority date: 2023-06-02
Filing date: 2023-06-02
Publication date: 2023-11-10
Anticipated expiration: 2033-06-02

Abstract

The utility model provides a battery module, which comprises a battery pack, end plates and a binding belt, wherein the end plates are arranged on two sides of the battery pack; the ribbon is encircling the outside of the battery pack and used for fixing the battery pack and the end plate; the elastic piece is arranged on the end plate and abuts against the binding belt; the band is provided with a buffer section, so that the band has telescopic capability. This battery module, through setting up elastic component and buffer section, the elastic component can produce compression set when the group battery is deformed, for the deformation of group battery provides the space, avoid the too big ribbon fracture or the end plate damage scheduling problem that leads to of pressure between ribbon and the end plate, simultaneously, because the existence of ribbon buffer section, if the deformation volume of group battery is too big, produced great pressure to the elastic component, the elastic component can be with the pressure response to the ribbon on to through the length of the tensile ribbon of buffer section, further guarantee the structural stability of module.

Description

Battery module

Technical Field

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

Background

When multiple cells are packaged together by the same housing frame and are connected to the outside by a unified border, this constitutes a module. Further, after several modules are controlled or managed together by the BMS and the thermal management system, the unified whole is called a battery pack. Therefore, the module is an intermediate energy storage unit between the battery cell unit and the battery pack, and the module forms a modularized battery pack by connecting a plurality of battery cells in series and parallel and adding auxiliary structural members which play roles in collecting current, collecting data, fixing and protecting the battery cells and the like.

In the assembly process of the battery, the formed module can play a role in supporting, fixing and protecting the internal battery core, so that the design of the battery module needs to meet the requirements on four aspects of mechanical strength, cycle life, electrical performance and heat dissipation performance, which are also standards for judging the quality of the battery module, and the mechanical strength can be directly reflected on end plates and binding belts on the module.

The utility model discloses a "battery module" of publication number CN111883718A, it discloses through metal ribbon and nonmetal ribbon cooperation, guarantees battery module mechanical properties, and improves economic benefits's scheme, but, the electric core can expand gradually in the cyclic process of module, and this kind of expansion force is very big, if module intensity is not enough can cause ribbon or end plate fracture, electric core circulation can take place to jump this moment, and module intensity if too big, electric core charge and discharge's expansion force can cause electric core stress unable release, and electric core can be by extrusion deformation even fracture when serious.

Disclosure of Invention

In view of this, the utility model provides a battery module to solve the problems that the battery cells gradually expand during the circulation process of the module, the expansion force is large, if the module strength is insufficient, the band or the end plate is broken, the battery cells circulate at the moment and jump, if the module strength is too large, the expansion force of the battery cells during charging and discharging can cause the stress of the battery cells to be unable to be released, and the battery cells are extruded, deformed or even broken seriously.

The technical scheme of the utility model is realized as follows: the utility model provides a battery module, which comprises a battery pack, end plates and a binding belt, wherein,

the end plates are arranged on two sides of the battery pack;

the ribbon is encircling the outside of the battery pack and used for fixing the battery pack and the end plate;

and also comprises an elastic piece, wherein,

the elastic piece is arranged on the end plate and abuts against the binding belt;

the band is provided with a buffer section, so that the band has telescopic capability.

On the basis of the technical scheme, preferably, the ribbon further comprises a rigid section, and the rigid section and the buffer section are connected end to form a closed loop.

Further preferably, the rigid section and the buffer section are integrally formed with the same material.

On the basis of the technical scheme, preferably, the end plate is provided with a containing groove, and the elastic piece is arranged in the containing groove.

On the basis of the technical scheme, preferably, the elastic pieces are distributed in an array mode, and the elastic pieces are multiple in number.

Further preferably, the number of the bands is two, and each row of the elastic members corresponds to the same band.

Further preferably, the elastic member abuts against a rigid section of the tie.

On the basis of the technical scheme, preferably, the elastic piece is a spring.

On the basis of the technical scheme, preferably, the number of the binding belts is at least two, and one of the binding belts is made of stainless steel or PET plastic.

On the basis of the technical scheme, preferably, the buffer section is arranged on one side of the end plate along the arrangement direction of the battery cells.

Compared with the prior art, the battery module has the following beneficial effects:

(1) Through setting up elastic component and buffer section, the elastic component can produce compression deformation when group battery deformation, for the deformation of group battery provides the space, avoids the too big problem such as cable tie fracture or end plate damage that leads to of pressure between ribbon and the end plate, simultaneously, because the existence of ribbon buffer section, if the deformation volume of group battery is too big, produced great pressure to the elastic component, the elastic component can react the pressure to the ribbon to the length of tensile ribbon of buffer section, further guarantee the structural stability of module;

(2) Set up the buffer section on the ribbon, can make the ribbon be less than the specification of conventional ribbon when producing, in the assembly process, through tensile buffer section, overlap the ribbon to group battery and end plate on to avoid the error of group battery and the error in the ribbon production process to influence assembly quality.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a battery module according to the present utility model;

fig. 2 is an exploded view of the battery module according to the present utility model;

fig. 3 is a partial schematic view of a battery module according to the present utility model;

fig. 4 is a side view partially schematic diagram of the battery module of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.

As shown in fig. 1 to 4, the battery module of the present utility model includes a battery pack 1, an end plate 2, a band 3, and an elastic member 4.

The battery pack 1 is formed by closely arranging a plurality of square shell battery cells along the thickness direction, and the pole posts of the battery cells are all positioned on the same side so as to facilitate the installation of the busbar, the liquid cooling plate and other components, and meanwhile, in order to ensure the energy density and the quality of the battery pack, the battery cells with the same process and specification are selected for assembly.

When the end plate 2 is installed on the battery pack 1, two end plates 2 are usually required to be arranged on two outermost electric cores respectively, namely, two sides of the battery pack 1 in the electric core arrangement direction, the end plate 2 is used for protecting the outer electric cores, the mechanical stability of the module is improved, the end plate 2 is formed by casting magnesium aluminum alloy, the density of the magnesium aluminum alloy is generally less than 1.8g.cm3, the specific performance of the magnesium and aluminum alloy is improved due to the low density of the magnesium aluminum alloy, the magnesium aluminum alloy has good strength, rigidity and dimensional stability, and the integral quality of the battery module can be reduced due to the adoption of the end plate 2 made of the magnesium aluminum alloy, and the battery module has good mechanical performance.

The ribbon 3 surrounds the outside of the battery pack 1 formed by arranging the electric cores, and two end plates 2 are bound, so that the two end plates 2 extrude each electric core from two ends, the formed battery pack 1 is fixed, relative displacement between the electric cores is prevented, and the ribbon 3 is a strip-shaped part connected end to form a closed-loop structural part.

The big difference is among ribbon 3 and the prior art, ribbon 3 in this embodiment has buffer section 32, through setting up buffer section 32 on ribbon 3, make ribbon 3 can have flexible ability, embody in the production process, can have small error between the electric core, in the combination process, this error can increase gradually, lead to ribbon 3 unable cover to the outside of group battery 1, perhaps unable stable tie up group battery 1, and ribbon 3 also can have certain error in the production process, whether the error of electric core, the error when ribbon 3 produces, all can cause the influence to the assembly quality of battery module, set up buffer section 32 on ribbon 3, can make ribbon 3 be less than the specification of conventional 3 in the production, in the assembly process, through tensile buffer section 32, with ribbon 3 cover to group battery 1 with end plate 2, in order to avoid the error of group battery 1 and ribbon 3 in-process error influence assembly quality.

The elastic piece 4 is a structural piece with an elastic expansion function, the elastic piece 4 is installed on the end plate 2, one end in the elastic expansion direction is propped against the ribbon 3, in the cyclic use process of the battery pack 1, the electric core in the battery pack 1 expands in the thickness direction, the electric core is deformed in the arrangement direction of the electric core, the elastic piece 4 can generate compression deformation when the battery pack 1 deforms, a space is provided for deformation of the battery pack 1, the problems that the ribbon 3 is broken or the end plate 2 is damaged due to overlarge pressure between the ribbon 3 and the end plate 2 are avoided, meanwhile, due to the existence of the buffer section 32 of the ribbon 3, if the deformation amount of the battery pack 1 is overlarge, larger pressure is generated on the elastic piece 4, the elastic piece 4 can react the pressure to the ribbon 3, and the length of the ribbon 3 is stretched through the buffer section 32, so that the structural stability of a module is further ensured.

The elastic member 4 may be directly selected as a spring, and it should be noted that the elastic member 4 needs to be compressed during the installation of the band 3, otherwise, the battery pack 1 cannot be effectively bound after the band 3 is installed.

In this embodiment, the ribbon 3 further includes a rigid section 31, the rigid section 31 and the buffer section 32 are connected end to form a closed loop, the rigid section 31 is a main body portion of the ribbon 3, and because the ribbon 3 forms a closed loop, the rigid sections 31 and the buffer sections 32 are the same in number and are staggered with each other, the rigid sections 31 do not have deformation capability, in order to realize the telescopic function of the buffer sections 32, the buffer sections 32 can be directly arranged on the ribbon, and the ribbon is shaped into a plurality of S-shaped bending portions for connection, namely, in a wavy line shape, and small-range expansion and contraction of the ribbon 3 are realized through expansion and contraction deformation of the material.

If the buffer section 32 is provided in a wavy manner, and the buffer section 32 is provided on a side surface of the battery pack 1 in the arrangement direction of the battery cells, the bent portion of the buffer section 32 contacts the outer shell of the battery cells, so that the buffer section 32 extrudes the battery cells to extend in advance, and normal telescopic use of the battery cells is affected.

In addition, there is frictional resistance at the corner where the battery pack 1 contacts the ribbon 3, and if the buffer section 32 is disposed on the side of the cell arrangement direction, the deformation of the battery pack 1 will first pull the buffer section 32 to stretch, and the buffer section 32 is disposed on the cell direction of the battery pack 1, i.e. on the outer side of the end plate 2 in the thickness direction, so that the buffer section 32 does not contact the cell, and the deformation of the battery pack 1 in the length direction is avoided to directly stretch the buffer section 32.

It should be noted that, since the cells expand but do not contract after long-term cyclic use, the buffer segment 32 only needs to have an expansion function, but the expandable material generally also has a contraction property, so in this embodiment, it is represented as a expansion property.

Specifically, in order to avoid the production cost of the ribbon 3 being too high and influencing the overall economic benefit of the battery pack, in this embodiment, the rigid section 31 and the buffer section 32 on the same ribbon 3 are integrally formed with the same material, that is, in the processing process, the buffer section 32 is directly processed on the rigid section 31, so that the rigid section 31 and the buffer section 32 are prevented from being connected, if the rigid section 31 and the buffer section 32 are separately processed and then are assembled and installed, the production cost and the processing step can be increased no matter how the rigid section 31 and the buffer section 32 are fixed, and meanwhile, if the quality of the connecting part is poor, the risk of the pressed fracture of the ribbon 3 can be increased.

As a preferred embodiment, the end plate 2 is provided with a containing groove 21, the elastic element 4 is installed in the containing groove 21, the containing groove 21 on the end plate 2 is used for containing the elastic element 4, so that the elastic element 4 is prevented from being deviated in the assembling process, and meanwhile, a shrinkage space is provided for deformation of the elastic element 4, and the shrinkage space is set through the end plate 2, so that occupation of the space can be reduced.

In this embodiment, considering that the elasticity generated by the shrinkage of the single elastic member 4 is limited, in order to avoid that the single elastic member 4 generates a larger shrinkage range in the fixing process of the ribbon 3, so that a deformation space cannot be provided when the subsequent battery pack 1 deforms, the number of the elastic members 4 is set to be multiple and distributed in an array, so that the multiple elastic members 4 are in contact with the ribbon 3, and the binding pressure of the ribbon 3 can be distributed on the multiple elastic members 4, so that enough space is still available for shrinkage of the elastic members 4 after the binding is completed.

Specifically, in this embodiment, the number of bands 3 used for fixing the battery pack 1 and the end plate 2 is two, and similarly, the elastic members 4 distributed in an array on the single end plate 2 includes six of two rows and three columns, and each row of elastic members 4 corresponds to the same band 3, that is, each three elastic members 4 are abutted against one band 3.

Since the buffer section 32 on the band 3 has the ability to expand and contract, there is a possibility that the elastic member 4 directly contacts the buffer section 32 with instability, so in this embodiment, the elastic member 4 is disposed against the rigid section 31 on the band 3.

Among the two bands that set up, band 3 that is close to electric core one side is stainless steel material, and thickness is 1-2mm, another band 3 is PET plastics material, and thickness is 1.5-2mm, can save the cost in order to guarantee intensity in the purpose of design like this to reduce battery module's whole weight.

For the stainless steel ribbon 3, bending and shaping can be performed during production to form the buffer section 32, and for the plastic ribbon 3, the buffer section 32 can be formed by heating, softening, shaping and other modes.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. A battery module comprises a battery pack (1), an end plate (2) and a binding belt (3), wherein,

the end plates (2) are arranged on two sides of the battery pack (1);

the binding belt (3) surrounds the outside of the battery pack (1) and is used for fixing the battery pack (1) and the end plate (2);

the method is characterized in that: also comprises an elastic piece (4), wherein,

the elastic piece (4) is arranged on the end plate (2) and props against the binding belt (3);

the band (3) is provided with a buffer section (32) so that the band (3) has telescopic capacity.

2. The battery module according to claim 1, wherein: the ribbon (3) further comprises a rigid section (31), and the rigid section (31) and the buffer section (32) are connected end to form a closed loop.

3. The battery module according to claim 2, wherein: the rigid section (31) and the buffer section (32) are integrally formed by the same material.

4. The battery module according to claim 1, wherein: the end plate (2) is provided with a containing groove (21), and the elastic piece (4) is arranged in the containing groove (21).

5. The battery module according to claim 1, wherein: the number of the elastic pieces (4) is multiple, and the elastic pieces are distributed in an array.

6. The battery module according to claim 5, wherein: the number of the binding belts (3) is two, and each row of elastic pieces (4) corresponds to the same binding belt (3).

7. The battery module according to claim 2, wherein: the elastic piece (4) is propped against the rigid section (31) on the ribbon (3).

8. The battery module according to claim 1, wherein: the elastic piece (4) is a spring.

9. The battery module according to claim 1, wherein: the number of the binding tapes (3) is at least two, and one of the binding tapes (3) is made of stainless steel or PET plastic.

10. The battery module according to claim 1, wherein: the buffer section (32) is arranged on one side of the end plate (2) along the arrangement direction of the battery cells of the battery pack (1).