CN108666494B - Large module group structure of flexible soft-package battery - Google Patents

Abstract

The invention discloses a large module grouping structure of a flexible soft package battery, which comprises a plurality of blocks (2) and a plurality of middle frames (5) of modules which are stacked in a crossing manner along the thickness direction, and are packaged into groups by packing belts (1); the Block (2) is a battery module, and positive and negative electrodes of the blocks (2) are respectively and electrically connected through bus bars; the frame (5) in the module is positioned between the blocks (2), so that a certain range of gaps are adjusted and reserved between the blocks (2), and flexible grouping is realized. The invention can solve the conflict between the universality and the flexible design of the module, reduce the module grouping cost and improve the module grouping efficiency.

Description

A flexible soft pack battery large module assembly structure

Technical field

The invention belongs to the field of battery modules, and in particular relates to the structure of a large flexible soft-pack battery module for pure electric passenger vehicles.

Background technique

With the development of new energy electric vehicle technology, people have higher and higher requirements for their cruising range. As the cruising range of electric vehicles develops towards 500km or even 600km, the traditional vehicle chassis structure cannot adapt to the assembly requirements of its battery box. . The new generation of electric vehicle platforms is increasingly favored by OEMs. As battery power increases and costs decrease, the large-module assembly process begins to attract people's attention. At the same time, the configuration of different power capacities and driving ranges also requires a certain degree of flexibility in the structural design of the battery module, so that different types of series and parallel connections can be more easily realized.

In the existing technology, passenger car modules are mostly designed based on the VDA standard size or special-shaped modules are designed based on the battery pack space size. Although the standard module based on the VDA size (355*155*108) can well adapt to the installation needs in the battery pack of traditional vehicles, the 12 cells are fixed in a standard module structure composed of series and parallel connections, which cannot achieve flexibility. Cascading design requirements, and the smaller module structure brings about an increase in component costs, making it unable to adapt to the platform design requirements of the new generation of electric vehicles. Special-shaped large modules designed based on the space dimensions of the battery box have poor versatility and cannot meet the needs of low-cost general design.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible soft-pack battery large module structure that can solve the conflict between module versatility and flexible design, reduce module costs, and improve module assembly efficiency.

In order to achieve the above objects, the technical solution of the present invention is implemented as follows:

A flexible soft-pack battery large module assembly structure, including multiple Blocks (2) and multiple module middle frames (5) cross-stacked along the thickness direction, and packed into groups through packing tapes (1); the Block (2) ) is a battery module, and the positive and negative electrodes of multiple Blocks (2) are electrically connected through busbars; the frame (5) in the module is located between the Blocks (2), so that the Blocks (2) can be adjusted and Keep a certain range of gaps to achieve flexible grouping.

Further, the Block (2) is composed of two electric cores (21) and a thermally conductive aluminum plate assembly (22). The thermally conductive aluminum plate assembly (22) is located between the two electric cores (21). The thermally conductive aluminum plate The component (22) is provided with a buckle connected to the middle frame (5) of the module and a slot connected to the busbar.

Furthermore, the thermally conductive aluminum plate assembly (22) is composed of plastic supports (221) at both ends and the thermally conductive aluminum plate (222) that are thermally welded through a thermal welding zone (2213);

The cross-section of the thermally conductive aluminum plate (222) is "I" shaped. The large surface (2222) is coated with thermally conductive glue and is in direct contact with the battery core (21). The heat generated by the battery core (21) is transferred to the thermally conductive aluminum plate (222). The overflow surface (2221) Realize heat convection with the outside world;

The plastic support part (221) is an injection molded part and is provided with a slot (2212) for connecting with the middle frame (5) of the module; the end surface of the plastic support part (221) is provided with a busbar slot (2211) ), the busbar slot (2211) is a U-shaped limiting structure, and the busbar is directly placed into the busbar slot (2211) and achieves predetermined positioning.

Further, the bus bar and the electrodes of Block (2) are connected in series and parallel between Block (2) by welding; the bus bar is in a zigzag shape and includes a module bus bar (9) and a pole bus bar (8). ); M6 nuts are riveted at the end of the pole bus bar (8) for series connection between modules.

Furthermore, a pole cover (6) and a module cover (7) are provided outside the busbar; the pole cover (6) is a left-right symmetrical injection molded part, corresponding to the pole busbar ( In addition to 8), a "+" or "-" sign is engraved on the large surface (61) of the pole cover to distinguish the positive and negative poles of the module; a bending process port (62) is set at the front end of the pole cover to ensure that the front end of the pole cover It can be opened at 90° to realize the fixation of the copper rows between modules on the module poles; the pole cover guard plate (63) and the pole cover body are provided with process gaps (64) for manual separation as needed during actual installation. break to realize the copper bar connection between modules; the pole cover (6) and the module middle frame (5) are fixed through the slot (65) on the edge of the pole cover;

The module cover (7) is an extruded part, which is correspondingly arranged outside the module bus (9) to isolate the bus; there is a slot (71) on the edge of the module cover for connecting with the module. The framework implements the connection.

Furthermore, the middle frame (5) of the module is symmetrical and can be cascaded. The left and right sides are provided with packing belt limit slots (51), buckles (52) connected to the Block (2) and for installation. The M6 nut mounting position of the busbar (53).

Furthermore, in addition to the outermost Blocks (2) on both sides of the module, there is also a module side frame (4). The module side frame (4) is symmetrical and has packing belt limit slots on both sides. and a protruding edge (41). The edge (41) is used to isolate the module fixing bolt cap and the series-connected copper bar between the modules to prevent short circuit.

Furthermore, the module side frame (4) is also provided with a module end plate (3). The module end plate (3) is an extruded aluminum profile; both ends are provided with module fixing holes ( 31); there is a module positioning hole (32) in the middle; a module lifting hole (33) is provided on the end face; a liquid cooling plate relief groove (34) is provided at the bottom; there are packing belt positioning grooves (35) on both sides.

Compared with the prior art, the present invention has the following beneficial effects:

The present invention provides a soft-package large module structure designed based on the platform layout requirements of electric vehicles, which effectively solves the contradiction between module versatility and flexible design. The present invention can meet different types of series and parallel connection requirements by increasing or decreasing the number of Blocks (2) and frames (5) in the module, thereby realizing flexible grouping. The module frame, end plates and cover plates are all formed using low-cost injection molding or extrusion processes, and have good versatility. Changes in the number of series and parallel modules will not bring more differential parts, reducing the cost of the module. , improving group efficiency.

Description of the drawings

Figure 1 is an exploded view of a large module in an embodiment of the present invention;

Figure 2 is a schematic assembly diagram of a large module in an embodiment of the present invention;

Figure 3 is a schematic diagram of Block assembly in the embodiment of the present invention;

Figure 4 is an exploded view of Block in the embodiment of the present invention;

Figure 5 is a schematic structural diagram of the thermally conductive aluminum plate assembly in the embodiment of the present invention;

Figure 6 is a schematic structural diagram of the module side frame in the embodiment of the present invention;

Figure 7 is a schematic diagram of the frame structure of the module in the embodiment of the present invention;

Figure 8 is a schematic structural diagram of the module end plate in the embodiment of the present invention;

Figure 9 is a schematic structural diagram of the module cover in the embodiment of the present invention;

Figure 10 is a schematic structural diagram of the pole cover in the embodiment of the present invention.

Detailed ways

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

As shown in Figures 1 and 2, the invention provides a large flexible soft package module including: packing tape 1, Block 2, module end plate 3, module side frame 4, module middle frame 5, and pole cover 6 , module cover 7, pole bus 8, module bus 9. Among them, two module end plates 3, two module side frames 4, multiple Blocks 2 and multiple module middle frames 5 are stacked along the thickness direction and then packed into a group with packing tape. By adjusting the thickness of the frame in the module and leaving a gap of 0.2 to 0.5mm between Block2, the modules can be flexibly grouped along the thickness direction of the cells.

The module bus 9 and the pole bus 8 are connected to the electrodes of Block 2 by welding to realize the series and parallel connection between Block 2. The bus bar is in a zigzag shape, with a tooth width of 8 mm and a gap width of 12 to 18 mm. The bus bar can Realize nesting production and save production costs. Module bus 9 is used for the connection between Block 2 in the module. The end of pole bus 8 is riveted with an M6 nut for series connection between modules. The bus bar material is copper or pure aluminum with good conductivity.

As shown in Figures 3 and 4, Block 2 is composed of two electric cores 21 and a thermally conductive aluminum plate assembly 22; as shown in Figure 5, the thermally conductive aluminum plate assembly 22 consists of plastic supports 221 at both ends and a thermally conductive aluminum plate 222 that is heated through a thermal welding zone 2213. Welded composition. The large surface 2222 of the thermally conductive aluminum plate is coated with thermal conductive glue and is in direct contact with the battery core 21 to transfer the heat generated by the battery core 21 to the introduction aluminum plate 222. The overflow surface 2221 of the introduction aluminum plate realizes heat convection with the external environment. The heat-conducting aluminum plate 222 has an "I"-shaped cross-section and can effectively transfer the heat generated by the battery core 21 to the outside of the module. The plastic supports 221 at both ends of the thermally conductive aluminum plate assembly are injection molded parts, and are connected to the module frame between the blocks through slots 2212. A pole busbar slot 2211 is reserved on the end face, and the busbar slot 2211 is a U-shaped limiter. structure, the busbar is directly put into the busbar card slot 2211 and achieves predetermined positioning. The thermally conductive aluminum plate 222 is an aluminum plate with a thickness of 0.2 to 0.5 mm, which is formed by bending and dead-edge processes, and the surface treatment process is anodizing.

The main function of the module frame of the present invention is to fill the gap between Block 2 and ensure the overall strength of the module. The module framework is designed following the principles of left-right symmetry and cascadable design. Among them, as shown in Figure 6, the module side frame 4 is placed between the module end plate 3 and Block 2. The extended edge 41 is used to isolate the module fixing bolt cap and the series-connected copper bars between the modules to prevent short circuit. As shown in Figure 7, the frame 5 of the module has reserved packing strap limiting slots 51, buckles 52 connected to the thermally conductive aluminum plate assembly 22, and M6 nut mounting positions 53 for installing the pole bus 8.

As shown in Figure 8, the module end plate 3 is an extruded aluminum profile, and the 8.5×9.5 waist-shaped holes 31 at both ends are module fixing holes. M8 long bolts are used around the module to fix it to the lower box. The Φ7 round hole 32 in the middle is the module positioning hole. When double-layer modules need to be arranged, you can also use M6 long bolts to fix the lower module through the Φ7 round hole 32 in the middle; then use M8 long bolts Fix the upper and lower modules at the same time. The end face is processed with module lifting holes 33, the bottom of the module end plate 3 is processed with a liquid cooling plate relief groove 34, and there are packing belt positioning grooves 35 left on both sides of the module end plate 3.

As shown in Figure 9, the module cover 7 is an extruded part. Its main function is to isolate the busbar to achieve electrical safety. It is connected to the module frame through the slot 71 on the edge of the module cover. The module cover 7 can be freely cut according to the module length requirements to achieve low-cost production.

As shown in Figure 10, the pole cover 6 is a left-right symmetrical injection molded part, using a two-mold injection molding process, with "+" and -" marks respectively engraved on the large surface 61 of the pole cover. The front end of the pole cover is provided with a bending process port 62 to ensure that the front end of the pole cover can be opened at 90° to achieve the fixation of the copper rows between modules on the module poles. The pole cover guard plate 63 and the pole cover body are provided with process gaps 64, which can be manually broken as needed during actual installation, thereby facilitating the connection of copper bars between modules. The pole cover 6 is fixed to the middle frame 5 of the module through the slot 65 on the edge of the pole cover, and is fixed to the side frame 4 of the module through the middle buckle 66.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (5)

1. The large module group structure of the flexible soft package battery is characterized by comprising a plurality of blocks (2) and a plurality of middle frames (5) of modules which are stacked in a crossing manner along the thickness direction, and are packaged into groups through packaging belts (1); the Block (2) is a battery module, and positive and negative electrodes of the blocks (2) are respectively and electrically connected through bus bars; the frame (5) in the module is positioned between the blocks (2) to adjust and keep a certain range of gaps between the blocks (2) so as to realize flexible grouping,

the bus bars and the electrodes of the blocks (2) are connected in series and parallel in a welding mode; the bus bars are zigzag and comprise module bus bars (9) and pole bus bars (8); the end of the post busbar (8) is press-riveted with a nut of M6 for serial connection between modules,

a pole cover (6) and a module cover plate (7) are arranged outside the busbar; the pole cover (6) is a bilaterally symmetrical injection molding piece and is correspondingly arranged outside the pole busbar (8), and a plus or minus sign is carved on the large surface (61) of the pole cover for distinguishing the positive and negative poles of the module; the front end of the pole cover is provided with a bending process port (62), so that the front end of the pole cover can be opened by 90 degrees, and the copper bars among the modules are fixed on the pole of the module; the pole cover guard plate (63) and the pole cover body are provided with process notches (64), and the pole cover guard plate and the pole cover body are manually broken according to the requirement during actual installation, so that copper bar connection among the modules is realized; the pole cover (6) is fixed with the middle frame (5) of the module through a pole cover Bian Buka groove (65);

the module cover plate (7) is an extrusion molding piece and is correspondingly arranged outside the module busbar (9) to isolate the busbar; is provided with a module cover plate edge clamping groove (71) for realizing connection with a module frame,

the frame (5) bilateral symmetry in the module, both sides all are equipped with packing area spacing groove (51), link to each other with Block (2) buckle (52) and be used for installing M6 nut mounted position (53) of busbar.

2. The flexible soft package battery large module group structure according to claim 1, wherein the Block (2) is composed of two electric cores (21) and a heat conducting aluminum plate assembly (22), the heat conducting aluminum plate assembly (22) is located between the two electric cores (21), and the heat conducting aluminum plate assembly (22) is provided with a buckle connected with a frame (5) in the module and a clamping groove clamped with a bus bar.

3. The large module group structure of the flexible pouch battery according to claim 2, wherein the heat conductive aluminum plate assembly (22) is composed of plastic supports (221) at both ends and a heat conductive aluminum plate (222) heat-welded through a heat welding region (2213);

the section of the heat conducting aluminum plate (222) is I-shaped, the large surface (2222) is coated with heat conducting glue to be in direct contact with the battery cell (21), heat generated by the battery cell (21) is transferred to the heat conducting aluminum plate (222), and heat convection is realized between the overflow surface (2221) and the outside;

the plastic supporting piece (221) is an injection molding piece and is provided with a clamping groove (2212) for being connected with the middle frame (5) of the module; the end face of the plastic support piece (221) is provided with a busbar clamping groove (2211), the busbar clamping groove (2211) is of a U-shaped limiting structure, and the busbar is directly placed into the busbar clamping groove (2211) and is positioned in advance.

4. The large flexible soft package battery module grouping structure according to claim 1, wherein a module side frame (4) is further arranged outside the blocks (2) at the outermost edges of two sides of the module, the module side frame (4) is bilaterally symmetrical, packing belt limiting grooves and long-out edges (41) are arranged on two sides of the module side frame (4), and the edges (41) are used for isolating serial connection copper bars between module fixing bolt caps and the module to prevent short circuits.

5. The large module grouping structure of the flexible soft package battery according to claim 4, wherein a module end plate (3) is arranged outside the module side frame (4), and the module end plate (3) is an extruded aluminum profile; the two ends are provided with module fixing holes (31); the middle is provided with a module positioning hole (32); the end face is provided with a module lifting hole (33); the bottom is provided with a liquid cooling plate abdication groove (34); the two sides are provided with packing belt positioning grooves (35).