CN210092284U

CN210092284U - Large module structure of lithium ion battery

Info

Publication number: CN210092284U
Application number: CN201920878895.7U
Authority: CN
Inventors: 卢一; 张福增; 陈保国
Original assignee: Tianjin EV Energies Co Ltd
Current assignee: Tianjin EV Energies Co Ltd
Priority date: 2019-06-12
Filing date: 2019-06-12
Publication date: 2020-02-18
Anticipated expiration: 2029-06-12

Abstract

The utility model provides a large module structure of a lithium ion battery, which comprises a battery pack, first end plates arranged at two ends of the battery pack and second end plates arranged in the middle of the battery pack; the battery pack comprises a plurality of single batteries which are sequentially connected together; the large module structure further comprises a reinforcing structure penetrating through the first end plate, the battery pack and the second end plate in the length direction. The large lithium ion battery module structure not only fixes the two ends of the module, but also fixes the module in a vertical fixing direction in a two-section way, so that the stability of a space structure can be improved; a second end plate structure is added in the middle of the module, and six fixing holes are adopted for fixing, so that the strength of the module when the module is fixed with a system box body can be ensured; the long through nail structure enhances the strength of the whole structure of the module; the non-standard large module structure has better system adaptability; the battery cell/pack grouping rate of the large module structure is higher; the module assembly efficiency is higher.

Description

Large module structure of lithium ion battery

Technical Field

The invention belongs to the field of lithium ion batteries, and particularly relates to a large module structure of a lithium ion battery.

Background

With the technological innovation and the gradual popularization of new energy vehicles, the lithium ion power battery module is used as a core part of the new energy vehicle, the requirements on safety reliability, manufacturability and assembly performance are higher and higher, and meanwhile, in the development technology of the whole vehicle, in order to improve the energy density and the system space utilization rate of a battery system, a new module structure is required to adapt to the battery system.

At present, a module structure widely applied to a lithium ion power battery system is a standard VDA size structure, the size module is better in general type in the existing new energy vehicle type due to unified standards, when battery modules of different manufacturers are selected in a whole vehicle factory, the structure of the whole packaging system and the high-low voltage electrical arrangement are slightly changed, but certain limitation is brought to the development of a high endurance mileage and high energy density battery system, and the overall structure layout is limited.

Due to the wide application of the lithium ion power battery, the requirements on the energy density, the endurance mileage and the safety performance of a battery system are higher, so that the design of a module structure becomes a new direction for module development by how to realize the optimization of the structural layout and the high safety by efficiently utilizing the limited system space.

In the large module structure, the battery core is increased in size and quantity, the weight and the size of the module are increased, and the flexible package battery has high overall flexibility due to the characteristics of the structure of the flexible package battery, so that the flexible deformation of the module structure is easy to occur, and the spatial structure of the flexible package battery is damaged and fixed to become a design difficulty; in addition, thermal runaway design in large module structures becomes a difficult point.

Disclosure of Invention

In view of this, the present invention provides a large module structure of a lithium ion battery, so as to solve the technical problems in the prior art that the large module of the lithium ion battery is easily subjected to flexible deformation and unstable in spatial structure.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a large module structure of a lithium ion battery comprises a battery pack, first end plates arranged at two ends of the battery pack and second end plates arranged in the middle of the battery pack; the battery pack comprises a plurality of single batteries which are sequentially connected together; the large module structure further comprises a reinforcing structure penetrating through the first end plate, the battery pack and the second end plate in the length direction.

Furthermore, first end plate and second end plate all include the end plate body, vertical setting in this internal weakening through-hole of end plate and set up the recess at end plate body upper portion both ends, be equipped with the fixed orifices in the recess.

Preferably, the reinforcing structure is a through-nail structure or a bolt structure.

Furthermore, the number of the reinforcing structures is four, and the four reinforcing structures are respectively arranged at four corners of the first end plate.

Furthermore, a heat dissipation plate is arranged between the adjacent single batteries.

Further, the battery cell comprises a support frame and two battery cells fixedly mounted inside the support frame, the battery cells are electrically connected to form a copper bar output end, and through holes through which the reinforcing structures can penetrate are formed in four corners of the support frame respectively.

Furthermore, a buffering flame-retardant foam is arranged between the two battery cores positioned on the same supporting frame.

Furthermore, two side plates are respectively arranged at two side ends of the battery pack, the two side plates at the same side of the battery pack are positioned at two sides of the second end plate, two clamping grooves are formed in the side face of the supporting frame, and two flanging structures clamped with the clamping grooves are arranged on the side plates.

Furthermore, the flanging structures are positioned at the upper end and the lower end of the side plate.

Furthermore, an insulating film is arranged between the battery pack and the first end plate, two output clamping grooves are formed in the side end of the end plate body of the first end plate, and a low-voltage plug-in connected with the output end of the battery pack is fixedly arranged in each output clamping groove 6.

Compared with the prior art, the large module structure of the lithium ion battery has the following advantages:

(1) the large lithium ion battery module structure not only fixes two ends of the module, but also fixes the module in a two-section way in the vertical fixing direction, so that the stability of a space structure can be improved; a second end plate structure is added in the middle of the module, and six fixing holes are adopted for fixing, so that the strength of the module when the module is fixed with a system box body can be ensured; the long through nail structure enhances the strength of the whole structure of the module; the large module structure of the lithium ion battery is a nonstandard large module structure, and has better system adaptability; the battery cell/pack grouping rate of the large module structure is higher; the module assembly efficiency is higher;

(2) the heat dissipation plate is additionally arranged between the single batteries, so that heat generated by the battery core in the module is led out, the heat of the power battery can be timely dissipated in the charging and discharging processes, and the service performance and the service life of the battery module are ensured;

(3) according to the large module structure of the lithium ion battery, provided by the invention, the bulge in the charging and discharging process of the battery cell can be absorbed by the arrangement of the foam cotton, so that the performance of the battery cell is ensured, and the service life is prolonged.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and, together with the description, serve to explain the invention without limitation. In the drawings:

fig. 1 is a schematic structural diagram of a large module structure of a lithium ion battery according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a large module structure of a lithium ion battery according to an embodiment of the present invention;

fig. 3 is an exploded schematic view of a large module structure of a lithium ion battery according to an embodiment of the present invention;

FIG. 4 is a schematic view of the first end plate;

FIG. 5 is a schematic view of the second end plate;

fig. 6 is a schematic structural view of a unit cell.

Description of reference numerals:

1-a first end plate; 2-a second end plate; 3-a reinforcing structure; 4-a groove; 5-fixing holes; 6-an output card slot; 7-an end plate body; 8-weakening the through holes; 9-a support frame; 10-electric core; 101-an output end of a copper bar; 11-a card slot; 12-side plates; 13-a heat sink; 14-foam cotton; 15-insulating film.

Detailed Description

It should be noted that the embodiments and features of the embodiments of the present invention may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientation or positional relationship indicated in the drawings, which are merely for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be construed as limiting the invention. Furthermore, the terms "first", "second", etc. 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," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted", "connected" and "connected" are to be construed broadly, e.g. as being fixed or detachable or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the creation of the present invention can be understood by those of ordinary skill in the art through specific situations.

The invention will be described in detail with reference to the following embodiments with reference to the attached drawings.

A large module structure of a lithium ion battery is shown in figures 1-5 and comprises a battery pack, first end plates 1 arranged at two ends of the battery pack and second end plates 2 arranged in the middle of the battery pack; the battery pack comprises a plurality of single batteries which are sequentially connected together; the large module structure further comprises a reinforcing structure 3 penetrating through the first end plate 1, the battery pack and the second end plate 2 in the length direction. The setting of second end plate can improve spatial structure stability.

Further, first end plate 1 and second end plate 2 all include end plate body 7, vertical setting weaken through-hole 8 and set up the recess 4 at end plate body 7 upper portion both ends in end plate body 7, are equipped with fixed orifices 5 in the recess 4. Six fixed orificess are fixed, intensity when can guarantee to fix with system's box.

Preferably, the reinforcing structure 3 is a through-pin structure or a bolt structure.

Further, four reinforcing structures 3 are provided at four corners of the first end plate 1.

Further, a heat dissipation plate 13 is provided between adjacent unit cells. In this example, the heat radiating plates 13 are aluminum alloy plates having an L-shaped cross section, and the heat radiating plates 13 are arranged vertically in parallel.

Further, the battery cell includes braced frame 9 and two electric cores 10 of fixed mounting in braced frame 9 inside, and each electric core 10 electricity is connected and is formed copper bar output 101, is equipped with the through-hole that additional strengthening 3 can run through on four angles of braced frame 9 respectively. The copper bar output terminal 101 in this example is located at the side of the module structure.

Furthermore, a buffer flame-retardant foam 14 is arranged between the two cells of the same support frame 9. The foam 14 may be PP foam or PC foam.

Furthermore, two side plates 12 are respectively arranged at two side ends of the battery pack, the two side plates 12 at the same side of the battery pack are positioned at two sides of the second end plate 2, two clamping grooves 11 are arranged on the side surface of the supporting frame 9, and two flanging structures clamped with the clamping grooves 11 are arranged on the side plates 12. The arrangement of two flanging structures on the side plate 12 can further improve the structural stability of the space of the large module.

Further, the flanging structures are positioned at the upper end and the lower end of the side plate 12.

Further, an insulating film 15 is arranged between the battery pack and the first end plate 1, and two output clamping grooves 6 are arranged at the side end of the end plate body 7 of the first end plate 1; and a low-voltage plug-in connected with the output end of the battery pack is fixedly arranged in the output clamping groove 6. The low-voltage plug-in this example is fixed in the output slot 6 of the first plate end 1 by glue. Can set up temperature sensor in the group battery as required, temperature sensor links to each other with the low pressure plug-in components, and preferably, temperature sensor is equipped with 3, sets up respectively at the both ends of group battery and middle part.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the invention, so that any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present invention, should be included in the scope of the present invention.

Claims

1. The utility model provides a big module structure of lithium ion battery which characterized in that: comprises a battery pack, first end plates (1) arranged at two ends of the battery pack and second end plates (2) arranged in the middle of the battery pack; the battery pack comprises a plurality of single batteries which are sequentially connected together; the large module structure further comprises a reinforcing structure (3) penetrating through the first end plate (1), the battery pack and the second end plate (2) in the length direction.

2. The large module structure according to claim 1, wherein: first end plate (1) and second end plate (2) all include end plate body (7), vertical setting weaken through-hole (8) in end plate body (7) and set up recess (4) at end plate body (7) upper portion both ends, be equipped with fixed orifices (5) in recess (4).

3. The large module structure according to claim 1, wherein: the reinforcing structure (3) is a through-nail structure or a bolt structure.

4. The large module structure according to claim 1, wherein: the number of the reinforcing structures (3) is four, and the four reinforcing structures are respectively arranged at four corners of the first end plate (1).

5. The large module structure according to claim 1, wherein: and a heat dissipation plate (13) is arranged between every two adjacent single batteries.

6. The large module structure according to any one of claims 1 to 5, wherein: the single battery comprises a supporting frame (9) and two battery cores (10) fixedly mounted inside the supporting frame (9), each battery core (10) is electrically connected with one another to form a copper bar output end, and through holes through which the reinforcing structures (3) can penetrate are formed in four corners of the supporting frame (9) respectively.

7. The large module structure according to claim 6, wherein: and a buffer flame-retardant foam (14) is arranged between the two battery cells positioned on the same supporting frame (9).

8. The large module structure according to claim 7, wherein: two side plates (12) are respectively arranged at two side ends of the battery pack, the two side plates (12) at the same side of the battery pack are positioned at two sides of the second end plate (2), two clamping grooves (11) are arranged on the side surface of the supporting frame (9), and two flanging structures clamped with the clamping grooves (11) are arranged on the side plates (12).

9. The large module structure according to claim 8, wherein: the flanging structures are positioned at the upper end and the lower end of the side plate (12).

10. The large module structure according to claim 1, wherein: the battery pack is characterized in that the first end plates (1) at the two ends of the battery pack are symmetrically arranged, an insulating film (15) is arranged between the battery pack and the first end plates (1), two output clamping grooves (6) are arranged at the side ends of the end plate body (7) of the first end plate (1), and a low-voltage plug-in unit connected with the output end of the battery pack is fixedly arranged in each output clamping groove (6).