CN115842220A

CN115842220A - Integrated collection busbar for battery module

Info

Publication number: CN115842220A
Application number: CN202211679898.0A
Authority: CN
Inventors: 张华�; 马承义; 聂辰; 罗卫明
Original assignee: Shenzhen Yuneng Technology Co ltd
Current assignee: Shenzhen Yuneng Technology Co ltd
Priority date: 2022-08-18
Filing date: 2022-12-26
Publication date: 2023-03-24
Also published as: CN218975725U; CN115579588A; CN115566370A; CN115295967A

Abstract

The invention belongs to the technical field of new energy power battery packs and energy storage, and discloses an integrated acquisition busbar for a battery module. The integrated collection busbar comprises a film layer, an FFC assembly and a plurality of conductive bus connecting bars, wherein the FFC assembly and the conductive bus connecting bars are fixed on the film layer, and the FFC assembly is independently connected with each conductive bus connecting bar through an FFC (flexible flat cable). The FFC assembly is adopted to replace the traditional FPC assembly, and the FFC assembly and the conductive bus connecting bar are fixed by the adhesive film layer, so that all the parts are combined into a whole. The whole integrated collecting bus bar is simple and light in structure, firm in connection, free of specially-made plastic supports and reinforcing plate structures, small in occupied space and significant in innovation significance in improving the space utilization rate of the battery and reducing the cost.

Description

Integrated collection busbar for battery module

Technical Field

The invention belongs to the technical field of new energy power battery packs and energy storage, and particularly relates to an integrated collection bus for a battery module.

Background

With the rapid development of the electric automobile industry, the electrification trend of the power assembly is more and more obvious. The battery is a very important part of the whole electric automobile as a power core of the electric automobile. The battery system of an electric vehicle is usually composed of a plurality of single batteries connected in series and parallel, and the service efficiency, the endurance mileage, the long-term reliability under severe conditions and the like of the battery system are related to the service performance and the safety of the whole vehicle.

With the standardization development of the industry, the design of the battery pack is developed towards standardization, the components of the battery pack are also designed towards integration, and the automation and integration trends of the industry impose higher requirements on the design matching capability of the component suppliers and the quality and performance of the components. In addition, the electric automobile is high in cost at present, and the cost is reduced at the design source, which is a common target of technicians in the field.

The integrated collection bus (CCS or IBB) is a highly integrated battery signal collection (such as temperature collection, pressure collection and the like) and management system, the existing CCS mainly comprises a plastic support, an FPC assembly and a conductive convergence connection aluminum bar (aluminum bar), the FPC assembly comprises an FPC board, a connector, a nickel sheet, an NTC resistor and the like, and all devices on the FPC assembly are pasted on the FPC board through SMT. The problems of complex structure, higher cost, large occupied space and heavy overall exist.

Patent CN109494336A discloses a battery module composite busbar. The composite bus-bar comprises a PCB layer, a conductive composite layer and a reinforcing layer which are sequentially stacked; a plurality of welding pads are arranged on the PCB layer; the conductive composite layer comprises a conductive layer and an insulating layer which are nested with each other; the conducting layer comprises a plurality of conducting plates integrated on a plane, the conducting plates are arranged corresponding to the battery cores respectively, and metal columns corresponding to the bonding pads are arranged on the conducting plates. This strengthening layer adopts the epoxy board to can open several blind holes or recesses, realize when reinforcing structural strength, still realize insulating and radiating effect.

Patent CN209029462U discloses a battery pack bus bar, which comprises a lower insulating film, an epoxy resin plate, a connecting bar, thermosetting adhesive, an FPC assembly and an upper insulating film from bottom to top; the epoxy resin plate is provided with through grooves, and the connecting rows are arranged in the through grooves; the FPC assembly comprises a copper foil, a nickel sheet, a PTC thermistor and a connector which are electrically connected, wherein one end of the nickel sheet is electrically connected with the copper foil, and the other end of the nickel sheet is electrically connected with the connecting bar; the PTC thermistor and the connector are arranged on the copper foil; the FPC assembly is bonded on the epoxy resin plate through the thermosetting adhesive; the upper insulating film is provided with an upper film through hole; the lower insulating film is provided with a lower film through hole.

Patent CN113517620A discloses a replaceable collection flexible wiring harness board integrated bus bar for a new energy automobile power battery, which comprises a wiring harness board plastic support, a plurality of conductive bus connecting bars, an FPC collection wiring harness and an output connector; the FPC acquisition wiring harness and the plurality of conductive bus connecting bars are arranged on the wiring harness board plastic support in a separated mode, and the output end of the FPC acquisition wiring harness is in butt joint with the output connector; particularly, the FPC collecting harness is designed to be replaceable, and the modular plug-in replacement of the FPC collecting harness is realized by arranging the detachable connecting device between each conductive bus connecting bar and the FPC collecting harness.

The integrated female row that above-mentioned patent adopted adopts pencil FPC subassembly or PCB subassembly to carry out signal acquisition equally, and the structure is complicated, with higher costs, and need adopt the resin board or the plastic support of specific fluting or trompil for realizing FPC subassembly or PCB subassembly fixed, and its structure is complicated, and the space occupies greatly, and whole weight.

Disclosure of Invention

Aiming at the defects and shortcomings of the prior art, the invention aims to provide an integrated collection busbar for a battery module.

The purpose of the invention is realized by the following technical scheme:

the utility model provides an integrated female arranging of gathering for battery module, includes the glued membrane layer and is fixed in FFC subassembly and a plurality of electrically conductive busbar connection on the glued membrane layer, the FFC subassembly passes through FFC winding displacement and every electrically conductive busbar connection is connected alone.

Furthermore, the glue film layer is a PET glue film layer, and the thickness of the PET glue film layer is 0.03-2 mm.

Further, the PET film layer consists of a PET layer and an adhesive layer; the thickness of the PET layer is 0.03-1 mm, and the thickness of the adhesive layer is 0.01-0.1 mm.

Furthermore, the adhesive film layer is an independent adhesive film layer, and the FFC assembly and the conductive bus connecting bar are fixed into an integral integrated cover plate through the adhesive film layer; or the adhesive film layer comprises an upper adhesive film layer and a lower adhesive film layer, and the FFC assembly and the conductive bus connecting bar are fixedly adhered between the upper adhesive film layer and the lower adhesive film layer; the upper adhesive film layer is a single-sided adhesive, and the lower adhesive film layer is a single-sided adhesive or a double-sided adhesive. The adhesive film layer mainly has the functions of adhering and fixing the FFC assembly and the conductive bus bar, combining all parts into an integral integrated cover plate and playing the roles of insulation and water resistance. The connecting structure has the advantages of simple structure, stable connection, small occupied space, light weight and low cost.

Furthermore, the upper adhesive film layer and/or the lower adhesive film layer are/is provided with an opening for arranging a conductive bus connecting bar or a welding site or a signal acquisition site. The conductive bus connecting bar is connected or welded with the battery pack electric core pole column in a matched mode through the opening.

Furthermore, the FFC assembly comprises an FFC flat cable, an FFC flat cable acquisition end and the conductive bus connecting bar are fixed by welding or splicing, and the FFC flat cable acquisition end is integrated with signal acquisition devices such as an NTC device and the like; the FFC flat cable output end is connected with the output connector after being collected. The FFC may be welded to the conductive bus bar by direct welding (such as ultrasonic welding, but not limited to) or by nickel sheet transfer. Direct welding is preferred, so that the process is simple and the cost is low. The reliability can be enhanced by adding a dispensing process to the welding spots.

Furthermore, the FFC assemblies are one or more, and the plurality of FFC assemblies are arranged in a planar distribution mode or in a laminated mode.

Further, the conductive bus connecting bar is made of aluminum bar, copper bar or copper-aluminum composite material.

Furthermore, the conductive bus connecting bar is also provided with a welding hole. The welding of the conductive bus connecting bar and the battery cell pole can be realized by means of seam welding, penetration welding and the like.

Furthermore, positioning holes are further formed in the two ends of the integrated collecting busbar. After wrapping up through the glue film layer, female wholeness of arranging is better, only needs the locating hole at location both ends, can tile on electric core, welds the busbar on electric core again, realizes whole fixed.

Furthermore, a pressure relief avoiding groove is formed in the adhesive film layer. The pressure relief avoiding groove is used for being matched with the battery pack electric core pressure relief valve so as to facilitate pressure relief of the battery pack.

Compared with the prior art, the invention has the beneficial effects that:

(1) The FFC assembly replaces the traditional FPC assembly, and the FPC assembly has the advantages of simple structure, low cost, high flatness and capability of being stuck and fixed.

(2) The FFC component and the conductive bus connecting bar are fixedly adhered by the adhesive film layer, all parts are combined into an integral integrated cover plate, and the integral structure of the integrated collection bus bar is fixed on the battery pack after the integral cover plate is connected with the battery cell pole through the subsequent conductive bus connecting bar. The whole integrated collecting bus bar is simple and light in structure, firm in connection, free of specially-made plastic supports and reinforcing plate structures, small in occupied space and significant in innovation significance in improving the space utilization rate of the battery and reducing the cost.

Drawings

Fig. 1 is a schematic view of an overall structure of an integrated collection busbar according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a structure of a glue coating layer of the integrated collection busbar according to the embodiment of the invention;

fig. 3 is a schematic structural view of a lower adhesive film layer of the integrated collection busbar according to the embodiment of the invention;

fig. 4 is a layout diagram of a pressure relief avoiding groove in the integrated collection busbar glue film layer in the embodiment of the invention.

Detailed Description

The present invention will be described in further detail with reference to examples and drawings, but the present invention is not limited thereto.

Example 1

The structural schematic diagram of the integrated collecting busbar for the battery module in this embodiment is shown in fig. 1 to 3. The FFC module comprises an upper adhesive film layer 1, a lower adhesive film layer 2, an FFC module 3 and a plurality of conductive bus connecting bars 4, wherein the FFC module 3 is fixedly adhered between the upper adhesive film layer and the lower adhesive film layer; the number of the FFC assemblies is two, and the FFC assemblies are distributed and arranged side by side; the typical structure of the upper and lower adhesive film layers is that single-sided PET adhesive films with the thickness of 0.13mm are adopted, or PET single-sided adhesive with the thickness of 0.13mm is adopted for the upper adhesive film layer, and PET double-sided adhesive with the thickness of 0.5mm is adopted for the lower adhesive film layer. The FFC assembly is fixedly welded or inserted with each conductive bus connecting bar through an acquisition end of an FFC flat cable, and the acquisition end of the FFC flat cable is integrated with a signal acquisition device such as an NTC device; the FFC flat cable output end is collected and then connected with an output connector 5. The opening 6 of settling electrically conductive busbar is seted up to upper and lower glued membrane layer, is equipped with welding hole 7 on the electrically conductive busbar, and this welding hole of electrically conductive busbar accessible carries out welded fastening with electric core utmost point post. The two ends of the integrated collection busbar are also provided with positioning holes 8, and the integrated collection busbar can be tiled on the battery cell through the positioning holes at the two ends.

In a specific embodiment, optionally, the upper and lower adhesive film layers are further provided with a pressure relief avoiding groove 9, and a position layout of the pressure relief avoiding groove is shown in fig. 4. The groove is kept away in the pressure release is used for matching battery package electricity core relief valve in order to make things convenient for the battery package pressure release.

In a preferred embodiment of the present invention, the conductive bus bar may be aluminum bar or copper bar having excellent conductivity and soldering property.

Example 2

The structural schematic diagram of the integrated collecting busbar for the battery module in this embodiment is shown in fig. 1 to 2. Comprises an upper adhesive film layer 1, an FFC assembly 3 and a plurality of conductive bus connecting bars 4, wherein the FFC assembly 3 is stuck and fixed on the upper adhesive film layer; the number of the FFC assemblies is two, and the FFC assemblies are distributed and arranged side by side; the upper adhesive film layer is a PET single-sided adhesive with the thickness of 0.5mm, the FFC assembly is fixedly welded or spliced with each conductive bus connecting bar through the acquisition end of the FFC flat cable, and the acquisition end of the FFC flat cable is integrated with a signal acquisition device such as an NTC device; the FFC flat cable output end is collected and then connected with an output connector 5. The conductive bus connecting bar is provided with a welding hole 7, and the conductive bus connecting bar can be welded and fixed with the electric core pole column through the welding hole. The two ends of the integrated collection busbar are also provided with positioning holes 8, and the integrated collection busbar can be tiled on the battery cell through the positioning holes at the two ends.

In the specific embodiment, optionally, a pressure relief groove 9 is further formed on the upper adhesive film layer, and a position layout of the pressure relief groove is shown in fig. 4. The pressure relief avoiding groove is used for being matched with the battery pack electric core pressure relief valve so as to facilitate pressure relief of the battery pack.

As a preferred embodiment of the present invention, the conductive bus bar may be selected from aluminum bar or copper bar having excellent conductivity and weldability.

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims

1. The utility model provides an integrated female arranging of gathering for battery module which characterized in that, includes the glued membrane layer and is fixed in FFC subassembly and a plurality of electrically conductive busbar connection on the glued membrane layer, the FFC subassembly passes through FFC winding displacement and every electrically conductive busbar connection is connected alone.

2. The integrated collection busbar for the battery module according to claim 1, wherein the adhesive film layer is a PET adhesive film layer, and the thickness of the PET adhesive film layer is 0.03-2 mm; the PET film layer consists of a PET layer and an adhesive layer, wherein the thickness of the PET layer is 0.03-1 mm, and the thickness of the adhesive layer is 0.01-0.1 mm.

3. The integrated collecting busbar for the battery module according to claim 1 or 2, wherein the adhesive film layer is an independent adhesive film layer, and the FFC assembly and the conductive bus connecting bar are fixed into an integrated cover plate by being adhered through the adhesive film layer; or the adhesive film layer comprises an upper adhesive film layer and a lower adhesive film layer, and the FFC assembly and the conductive bus connecting bar are fixedly adhered between the upper adhesive film layer and the lower adhesive film layer; the upper glue film layer is single-sided glue, and the lower glue film layer is single-sided glue or double-sided glue.

4. The integrated collecting busbar for the battery module according to claim 3, wherein the upper adhesive film layer and/or the lower adhesive film layer is/are provided with openings for arranging conductive bus connecting bars or welding sites or signal collecting sites.

5. The integrated collecting busbar for the battery module according to claim 1, wherein the FFC assembly comprises an FFC (flexible flat cable), an FFC collecting end and a conductive bus connecting bar are fixed by welding or insertion, and an NTC (negative temperature coefficient) device is integrated with the FFC collecting end; the FFC flat cable output end is connected with the output connector after being collected.

6. The integrated collection busbar for battery modules according to claim 5, wherein the FFC assemblies are one or more, and a plurality of FFC assemblies are arranged in a planar distribution or a laminated arrangement.

7. The integrated collection busbar for battery modules according to claim 1, wherein the conductive busbar connection bar is aluminum bar, copper bar or copper-aluminum composite material.

8. The integrated collecting busbar for the battery module according to claim 1, wherein the conductive bus connecting bar is further provided with a welding hole.

9. The integrated collecting busbar for the battery module according to claim 1, wherein positioning holes are further formed in two ends of the integrated collecting busbar.

10. The integrated collection busbar for the battery module according to claim 1, wherein the adhesive film layer is further provided with a pressure relief avoiding groove.