CN207818664U - One kind keeping flat soft bag lithium ionic cell module - Google Patents

Abstract

The utility model discloses one kind keeping flat soft bag lithium ionic cell module, fixture including several submodules stacked horizontally and all submodules that are fixedly clamped, the submodule includes the holder of battery core and fixed battery core, the holder is frame plank frame, center has the cavity for placing battery core, the side of holder has the through-hole that the positive and negative lug for battery core passes through, and the positive and negative lug of all submodules is located at the same side of battery module, and passes through component connection of converging.The utility model keep flat soft bag lithium ionic cell module pass through submodule is stacked horizontally, then all submodules are fixedly clamped with fixture, submodule includes the holder of frame plank frame, battery core is fixed in the cavity of carriage center, it is not limited by battery core height to the height of battery module so that the better adaptability of battery module.

Description

A flat soft package lithium-ion battery module

technical field

The utility model relates to the technical field of lithium-ion batteries, in particular to a flat-lay soft-pack lithium-ion battery module.

Background technique

The development of energy-saving and new energy vehicles has become an inevitable choice for my country's energy strategy. According to the development plan, the current focus is to promote the industrialization of pure electric vehicles and plug-in hybrid vehicles. In my country, electric vehicles used to use lead-acid batteries as power batteries, but lead-acid batteries have low energy density and will have a negative impact on the environment, making manufacturers have to find alternatives; hybrid vehicles used to use nickel-metal hydride batteries, but Ni-MH batteries have low energy density and are not suitable for plug-in hybrid vehicles. Lithium-ion batteries have become the first choice for pure electric vehicles and plug-in hybrid vehicles because of their higher energy density.

The production history of lithium-ion batteries in my country is not short, but the production of soft-pack lithium-ion batteries specially used for electric vehicles has only begun in recent years. The use of soft-pack lithium-ion batteries in electric vehicles first requires the use of modular technology to combine battery cells into suitable modules, and then assemble them into battery boxes. However, when lithium-ion power batteries are applied modularly in electric vehicles, due to the influence of factors such as connection mode, consistency, and ambient temperature differences, parameters such as specific energy and specific power of the power battery module cannot reach the level of a single unit, and the service life is relatively short. The shortening of the body battery leads to an increase in system use and maintenance costs, which has become one of the bottlenecks restricting the industrial development and application of electric vehicles. To improve the life of electric vehicle power supply, in addition to improving the technology of the battery itself, it is also necessary to conduct research on battery integration methods or module structures, so that the life of battery modules can approach or reach the level of battery cells, which has become the consensus of the electric vehicle industry.

The common PACK method of the soft pack module is to place the cells vertically inside the battery pack, so the adaptability to the cells is poor. There are rigid requirements for the height of the battery pack body, that is, the height of the battery pack must be greater than the height of the cells in order to place the cells in the pack to form a group.

For example, the Chinese invention patent with the publication number CN103168387A discloses a battery pack for electric vehicles. The battery cells of the battery pack adopt an upright scheme, and there are intermediate plates for electrical insulation and heat conduction between the cells. Extending to the bottom of the battery, a heat conduction layer is arranged on the bottom, and a heat dissipation layer is arranged under the heat conduction layer. The heat generated by the battery passes through the middle plate and the heat conduction layer, and dissipates the heat in the heat dissipation layer. The heat dissipation structure of this solution is relatively complicated, the manufacturing cost is high, and the vertical solution is not good for the service life of the battery.

Utility model content

The utility model aims at the deficiencies of the prior art, and provides a flat-laid soft-pack lithium-ion battery module. The soft-pack lithium-ion battery is laid flat to improve the adaptability of the battery module.

A flat soft-pack lithium-ion battery module, including several horizontally stacked sub-modules and clamps for clamping and fixing all the sub-modules, the sub-modules include batteries and a bracket for fixing the batteries, and the bracket is a frame plate structure, There is a cavity in the center for placing the battery cell, and one side of the bracket has a through hole through which the positive and negative tabs of the power supply core pass through. The positive and negative tabs of all sub-modules are located on the same side of the battery module and are connected through the bus assembly.

The fixture includes upper and lower splints in a U-shaped structure. Both ends of the upper and lower splints have folded edges, and the two opposite folded edges are locked by bolts.

The folded edge is provided with reinforcing ribs connecting the folded edge with the side walls of the upper and lower splints.

Two electric cores in the same plane are arranged on the support.

The bracket is provided with a positioning mechanism on the upper and lower sides, and the positioning mechanism includes a positioning foot and a positioning groove that cooperate with each other when the two brackets are stacked.

The bus assembly includes a conductive bus piece connected to the tabs of the cells for connecting the cells in series or in parallel.

An insulating shield is provided on the outside of the conductive bus sheet.

The bracket has protrusions on both sides of the through hole, and the protrusions at corresponding positions on the same vertical sub-module are arranged in a vertical row, and the insulating shield is installed between two adjacent rows of protrusions.

There is a protrusion on the protrusion, and there are slots on both sides of the insulating shield to match the protrusion.

The side of the battery module away from the positive and negative tabs is provided with a cooling plate, and the cooling plate is fixed with the clamp.

In the utility model, the soft-packed lithium-ion battery module stacks the sub-modules horizontally, and then clamps and fixes all the sub-modules with clamps. The height of the battery module is not limited by the height of the cell, which makes the battery module more adaptable.

Description of drawings

Fig. 1 is a three-dimensional structural schematic diagram of a flat soft pack lithium-ion battery module of the present invention.

Fig. 2 is a partial enlarged view of A in Fig. 1 .

Fig. 3 is a three-dimensional structural schematic diagram of the flat-laying soft-pack lithium-ion battery module of the present invention after part of the insulating shield is removed.

Fig. 4 is a three-dimensional structure schematic diagram of another viewing angle of the flat-laid soft-pack lithium-ion battery module of the present invention.

FIG. 5 is a schematic diagram of a three-dimensional structure of a sub-module.

Fig. 6 is a schematic plan view of the sub-module.

Fig. 7 is a cross-sectional view along B-B direction in Fig. 6 .

Fig. 8 is a partial enlarged view of C in Fig. 7 .

Detailed ways

As shown in FIGS. 1 to 8 , a flat-packed soft-pack lithium-ion battery module includes several horizontally stacked sub-modules 1 and clamps for clamping and fixing all the sub-modules 1 . Fixture comprises upper clamping plate 2 and lower clamping plate 3 that are U-shaped structure, and the two ends of upper clamping plate 2 and lower clamping plate 3 have flange 4, are locked by bolt (bolt is not drawn among the figure) between two opposite flanges 4. The flange 4 is provided with a reinforcing rib 5 connecting the flange 4 with the side wall of the upper splint 2 or the lower splint 3 . Since the folded edges 4 are subjected to a relatively large force when being fixed between the folded edges 4, the arrangement of the ribs 5 helps the folded edges 4 to bear a relatively large force and is not easily deformed and damaged. In order to make the battery module have a better heat dissipation effect, both the upper splint 2 and the lower splint 3 have a grid structure instead of a whole block of airtight plates.

As shown in Figures 5 to 8, the sub-module 1 includes a battery cell 6 and a bracket 7 for fixing the battery cell 6. The bracket 7 is a frame plate structure with a cavity for placing the battery cell 6 in the center, and a power supply core 6 on one side of the bracket 7. The positive and negative tabs 8 of all sub-modules 1 are located on the same side of the battery module and are connected through the bus assembly. In one embodiment, there are two cavities on a bracket 7, and two battery cells 6 can be arranged, and the two battery cells 6 are in the same plane, so that the size of such a sub-module 1 is relatively wide, and the size of the assembled battery module is comparatively large. Fit and more stable. The bracket 7 is provided with a positioning mechanism on the upper and lower sides, and the positioning mechanism includes a positioning foot 11 and a positioning groove 12 that cooperate with each other when the two brackets 7 are stacked up and down. In order to enhance the heat conduction effect, one side of the bracket 7 of the sub-module 1 has a heat conduction sheet 10 abutting against the electric core 6 . When the sub-modules 1 are stacked, there is a thermal conductive sheet 10 between two adjacent battery cells 6 .

The bus assembly includes a conductive bus piece 13 connected to the tab 8 of the battery cell 6 for connecting the battery cells 6 in series or in parallel. Among them, the conductive busbar 13 as the positive and negative output terminals of the entire battery module is selected to be located above the battery module, which can facilitate subsequent operations such as external wiring. An insulating shield 14 is provided on the outside of the conductive bus piece 13, and the insulating shield 14 is used to protect the conductive bus piece 13 and other structures to avoid problems such as short circuit caused by external interference.

The bracket 7 has bumps 15 on both sides of the through hole 9, and the bumps 15 at the corresponding positions on the submodules 1 in the same vertical row (stacked vertically) are arranged in a vertical row, and the insulating shield 14 is installed on the adjacent between two columns of bumps 15 . There are protrusions 16 on the protrusions 15, which are formed by extending the top of the protrusions 15 to both sides in the horizontal direction (of course, the outermost protrusions 15 on both sides of the battery module have protrusions 16 only on the inner side. ), the two sides of the insulating shield 14 have the slots 17 matched with the protrusions 16. When assembling, the two slots 17 on both sides of the insulating shield 14 are respectively connected with the protrusions on one side of the adjacent two rows of protrusions 15. From 16 to match.

The side of the battery module away from the positive and negative tabs 8 is provided with a cooling plate 18, which is fixed with the fixture, and the cooling plate 18 is used to enhance the heat dissipation function of the battery module.

Claims (10)

1. A soft-packed lithium-ion battery module laid flat, characterized in that it includes several horizontally stacked sub-modules and clamps for clamping and fixing all sub-modules, the sub-modules include electric cores and brackets for fixing the electric cores, the The bracket is a frame-plate structure, with a cavity in the center for placing the battery cell. One side of the bracket has a through hole through which the positive and negative tabs of the power supply core pass through. The positive and negative tabs of all sub-modules are located on the same side of the battery module, and pass through Bus component connection. 2. The flat-pack soft-pack lithium-ion battery module according to claim 1, wherein the clamp includes upper and lower splints in a U-shaped structure, the two ends of the upper and lower splints have folded edges, and the two opposite The flanges are locked by bolts. 3. The lithium-ion battery module laid flat in a soft pack according to claim 2, wherein the folded edge is provided with reinforcing ribs connecting the folded edge with the side walls of the upper and lower splints. 4. The flat-lay soft-pack lithium-ion battery module according to claim 1, wherein two battery cells in the same plane are arranged on the support. 5. The lithium-ion battery module laid flat in a soft pack according to claim 1, wherein the bracket is provided with a positioning mechanism on the upper and lower sides, and the positioning mechanism includes a positioning foot and a Locating slot. 6 . The flat-lay soft-pack lithium-ion battery module according to claim 1 , wherein the bus assembly includes a conductive bus piece connected to the tabs of the cells for connecting the cells in series or in parallel. 7 . 7 . The flat-laying soft-pack lithium-ion battery module according to claim 6 , wherein an insulating shield is provided on the outside of the conductive bus. 8. The flat-laying soft-pack lithium-ion battery module according to claim 7, wherein the bracket has protrusions on both sides of the through hole, and the protrusions at corresponding positions on the sub-modules in the same vertical row are arranged in a vertical line. row, and the insulating shield is installed between two adjacent rows of bumps. 9 . The flat-packed soft-pack lithium-ion battery module according to claim 8 , wherein there are protrusions on the bumps, and slots on both sides of the insulating shield to match the protrusions. 10 . 10. The flat-lay soft-pack lithium-ion battery module according to claim 1, wherein a heat dissipation plate is provided on the side of the battery module away from the positive and negative tabs, and the heat dissipation plate is fixed with a clamp.