PET film press CCS assembly

Abstract

Polyethylene terephthalate (PET) film press cell interconnection system (CCS) assembly, comprising a PET film (1) wherein an upper surface of the PET film is coated with adhesive and bonded to two rows of aluminum foils (2); the upper surface of the PET film between the two rows of aluminum foils is bonded to a flexible printed circuit (FPC) (3); two sides of the FPC are provided with protruding nickel sheets (4); the nickel sheets on the two sides of the FPC are each welded to the two rows of aluminum foils; the FPC and the aluminum foils welded by the nickel sheets are bonded and attached to the PET film by pressing; and the PET film is provided with a window (5) corresponding to a bending groove of the aluminum foil.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a cell interconnect system (CCS) and more particularly to a polyethylene terephthalate (PET) film compression cell interconnect system (CCS) assembly. BACKGROUND

[0002] Due to the characteristics of battery cells, the temperature and charge / discharge current of a battery must be monitored in real time throughout battery operation in new power batteries and automobiles. A cell interconnect system (CCS) assembly captures temperature and current signals while interconnecting the cells.

[0003] The conventional CCS assembly mainly consists of a circuit board and aluminum foils. The circuit board and aluminum foils are mounted on an insulating film, which provides protection and support. A bending groove is provided in the center of the aluminum foil, and the bending groove can deform to prevent the aluminum foil from separating from the battery cell terminal due to thermal expansion and contraction. However, if the bending groove of the aluminum foil in the conventional CCS assembly deforms, the protective and supporting insulating film can easily tear and cause product damage. SUMMARY

[0004] An object of the present disclosure is to provide a polyethylene terephthalate (PET) film compression cell joining system (CCS) assembly that can prevent a bending groove of an aluminum foil from tearing a PET film due to thermal expansion and contraction, thereby avoiding the risk of product damage.

[0005] In the present disclosure, the PET film press CCS assembly includes a PET film, an upper surface of the PET film being provided with adhesive and bonded to two rows of aluminum foils; the upper surface of the PET film being bonded to a flexible printed circuit (FPC) between the two rows of aluminum foils; two sides of the FPC being provided with projecting nickel sheets; the nickel sheets on the two sides of the FPC being welded to the two rows of aluminum foils, respectively; the FPC and the aluminum foils welded by the nickel sheets being bonded and fixed to the PET film by pressing; and the PET film being provided with a window corresponding to a bending groove of the aluminum foil.

[0006] In the PET film pressing CCS assembly of the present disclosure, the FPC and the aluminum foils welded by the nickel sheets are bonded and affixed to the PET film by pressing, and the PET film is provided with the window corresponding to the bending groove of the aluminum foil by pressing. This design can prevent the bending groove of the aluminum foil from tearing the PET film due to thermal expansion and contraction, thereby avoiding the risk of product damage. Due to the pre-applied adhesive on the upper surface of the PET film, the aluminum foils and the FPC can be positioned on the PET film at an early stage of pressing, thus achieving convenient operation. In addition, the nickel sheets on both sides of the FPC are each integrally welded to the two rows of aluminum foils and affixed to the PET film by pressing.In this way, the FPC and the aluminum foils cannot be shifted so easily, which improves the pressing effect and the result.

[0007] In a preferred solution of the present disclosure, the adhesive is an AD adhesive.

[0008] In a preferred solution of the present disclosure, an outlet hole is provided on the PET film between the two rows of aluminum foils, penetrating the upper and lower surfaces of the PET film.

[0009] In a preferred solution of the present disclosure, the FPC is a U-shaped FPC.

[0010] In a preferred solution of the present disclosure, the FPC is provided with a first thermistor and a second thermistor.

[0011] In a preferred solution of the present disclosure, the PET film is provided with a thermistor window formed by pressing and corresponding to the second thermistor.

[0012] In a preferred solution of the present disclosure, the FPC is provided with a glass fiber stiffener and aluminum stiffeners; the FPC on the glass fiber stiffener is provided with a terminal; and the aluminum stiffeners are arranged on the back sides of the first thermistor and the second thermistor, respectively. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a rear view of a PET film press CCS assembly according to the present disclosure; Fig. 2 is a front view of the PET film press CCS assembly according to the present disclosure; and Fig. 3 is a structural diagram of an FPC according to the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0013] The following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to drawings. Obviously, the described embodiments are merely some, and not all, of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present disclosure without creative effort fall within the scope of the present disclosure.

[0014] As in the Fig.As shown in Figures 1 to 3, a PET film press CCS assembly includes PET film 1. An upper surface of the PET film is coated with adhesive and bonded to two rows of aluminum foils 2. A lower surface of the PET film between the two rows of aluminum foils is bonded to a flexible printed circuit (FPC) 3. Two sides of the FPC are provided with protruding nickel sheets 4. The nickel sheets on the two sides of the FPC are respectively welded to the two rows of aluminum foils. The FPC and the aluminum foils welded by the nickel sheets are bonded and press-fixed to the PET film. The PET film is provided with a window 5 that corresponds to the bending groove of the aluminum foil.

[0015] The FPC and the aluminum foils welded by the nickel sheets are glued and pressed onto the PET film. The PET film is pressed with a window corresponding to the bending groove of the aluminum foil. This design prevents the bending groove of the aluminum foil from tearing the PET film due to thermal expansion and contraction, thus avoiding the risk of product damage. Due to the pre-applied adhesive on the upper surface of the PET film, the aluminum foils and FPC can be positioned on the PET film at an early stage of pressing, thus achieving convenient operation. In addition, the nickel sheets on both sides of the FPC are respectively integrally welded to the two rows of aluminum foils and pressed onto the PET film. In this way, the FPC and aluminum foils are not easily shifted, which improves the pressing effect and the result.

[0016] Additionally, the nickel sheet may have one end welded to the FPC and the other end firmly attached to the aluminum foil. The nickel sheet and the aluminum foil are attached by laser welding to achieve an electrical connection.

[0017] The bottom surface of the PET film is coated with AD adhesive. The FPC is U-shaped with a hollow center, which is characterized by its small footprint, low material consumption, and low cost.

[0018] The FPC is provided with a first thermistor 7 and a second thermistor 8. The first thermistor and the second thermistor are configured to detect temperature changes in a battery pack in real time. The temperature change is converted into a resistance signal, and the resistance signal is transmitted to a battery management system (BMS) via a circuit and a connector on the FPC. In this way, the real-time temperature of each battery module can be recorded. The FPC is provided with a fiberglass stiffener 10 and aluminum stiffeners 11. The FPC on the fiberglass stiffener is provided with a connector 12. The aluminum stiffeners 11 are arranged on the backs of the first thermistor 7 and the second thermistor 8, respectively. The fiberglass stiffener 10 and the aluminum stiffeners 11 are 0.5 mm thick.The aluminum stiffeners 11 are coated with adhesive on one side and are bonded to the backs of the first thermistor 7 and the second thermistor 8, respectively. This design can prevent damage to the first thermistor 7 and the second thermistor 8 caused by thermal expansion and contraction, as well as damage to the first thermistor 7 and the second thermistor 8 due to curling or bending of the FPC during transportation in a manufacturing process. Additionally, the terminal is arranged on the FPC, and the fiberglass stiffener provides support under the FPC. The terminal is soldered to a pad corresponding to the FPC and matched to a pre-designed terminal on the BMS. That is, plug and socket terminals are connected accordingly to complete the information connection and transmission between the battery pack and the BMS.Additionally, the PET film is provided with a thermistor window 9, formed by pressing and corresponding to the second thermistor. The thermistor window 9 facilitates temperature detection of the second thermistor.

[0019] Between the two rows of aluminum foils, an outlet hole 6 is provided on the PET film, penetrating the upper and lower surfaces of the PET film. The outlet hole 6 facilitates the venting of an expansion valve of the battery cell, thereby improving the safety of use of the CCS.

[0020] The detailed solutions of the present disclosure are illustrated by the above embodiments, but the present disclosure is not limited to the above detailed solutions, meaning that it does not imply that the present disclosure must be implemented by relying on the above detailed solutions. Those skilled in the art should understand that any improvement to the present disclosure, any equivalent replacement of any raw material of the product of the present disclosure, any addition of excipients, and any selection of specific processes fall within the scope of protection and disclosure of the present disclosure.

Claims

[1] A polyethylene terephthalate (PET) film press cell joining system (CCS) assembly comprising a PET film (1), an upper surface of the PET film being provided with an adhesive and bonded to two rows of aluminum foils (2); the upper surface of the PET film being bonded to a flexible printed circuit (FPC) (3) between the two rows of aluminum foils; two sides of the FPC being provided with projecting nickel sheets (4); the nickel sheets on the two sides of the FPC being welded to the two rows of aluminum foils, respectively; the FPC and the aluminum foils welded by the nickel sheets being bonded and press-fixed to the PET film; and the PET film being provided with a window (5) corresponding to a bending groove of the aluminum foil. [2] PET film press CCS assembly according to claim 1, wherein the adhesive is an AD adhesive. [3] The PET film pressing CCS assembly according to claim 1, wherein an outlet hole (6) penetrating the upper and lower surfaces of the PET film is provided on the PET film between the two rows of aluminum foils. [4] The PET film press CCS assembly according to claim 1, wherein the FPC is a U-shaped FPC. [5] PET film pressing CCS assembly according to claim 1, wherein the FPC is provided with a first thermistor (7) and a second thermistor (8). [6] PET film press CCS assembly according to claim 5, wherein the PET film is provided with a thermistor window (9) formed by pressing and corresponding to the second thermistor. [7] The PET film compression-CCS assembly according to claim 5, wherein the FPC is provided with a glass fiber stiffener (10) and aluminum stiffeners (11); the FPC is provided with a terminal (12) on the glass fiber stiffener; and the aluminum stiffeners are arranged on the back surfaces of the first thermistor (7) and the second thermistor (8), respectively.

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