Organic solution for preparing supporting isolation layer and structure of new energy battery CCS module

Abstract

The invention relates to an organic solution for preparing a supporting isolation layer and a structure of a new energy battery CCS module, and belongs to the technical field of new energy battery packs. Modified epoxy resin is prepared, the modified epoxy resin is polyurethane modified epoxy resin, and epoxy resin and solvent ethylene glycol monoethyl ether acetate are mixed to form mixed liquid A; then adding a polyurethane prepolymer, and mixing to form a mixed solution B; adding a curing agent into the mixed solution B, wherein the curing agent is dicyandiamide / 2-. And then the collection circuit board and the busbar are covered by the ultrasonic spraying process, so that a structure and a method for fixing the collection circuit and the busbar of a supporting isolation plate or a supporting framework are omitted.

Description

Technical Field

[0001] The present application belongs to the technical field of new energy battery packs, and particularly relates to a packaging process for CCS modules. Background Art

[0002] A battery module typically consists of a single cell and a busbar support assembly. Multiple single cells are stacked in sequence to form a battery stack. Each single cell has a terminal at each end. Two busbar support assemblies are provided: one on one side of the battery stack, abutting the terminal at one end of each single cell, and the other on the other side of the battery stack, abutting the terminal at the other end of each single cell. The busbar support assembly serves to connect multiple single cells in series or parallel.

[0003] To this end, existing busbar brackets use PC blister or injection-molded isolation panels as support plates. These isolation panels require high-temperature riveting to secure the collection lines and busbars to the isolation panels. Alternatively, upper and lower PET hot-pressed films are heat-pressed and then bonded together. The PET hot-pressed films require pre-forming and then high-temperature hot-pressing to secure the collection lines and busbars to the isolation panels.

[0004] In the bus bracket assembly and battery cell module with publication number CN219203427U, the disclosed technical solution is that the bus part is fixed on the supporting frame; the top of the supporting frame is provided with an upper insulating protective part, and the bottom end is provided with a lower insulating protective part; the supporting frame is in the shape of a long strip; the supporting frame is made of flexible material.

[0005] The applicant's engineers believe that the production of support frames requires mold making. In order to deal with various types of CCS components in the existing technology, mold making for each support frame will greatly increase the company's costs; and the support frames produced after mold making will also have defective products, and the subsequent installation will also be very cumbersome. Summary of the Invention

[0006] The purpose of the present invention is to address the cost and installation complexity of existing support isolation plates or support frames, and to provide a fixing structure and method for collection lines and buses that eliminates the need for support isolation plates or support frames.

[0007] To achieve the above technical objectives, the following technical solutions are provided. In the first aspect, an organic solution for forming a supporting isolation layer is provided. The first step is to prepare a modified epoxy resin, wherein the modified epoxy resin is a polyurethane-modified epoxy resin. The epoxy resin is mixed with a solvent, ethylene glycol ethyl ether acetate, to form a mixed solution A. A polyurethane prepolymer is then added and mixed to form a mixed solution B.

[0008] The second step is to add a curing agent to the mixed liquid B, the curing agent is dicyandiamide / 2-.

[0009] In an operative manner, the temperature of the mixed solution A in the first step is 68°C-72°C.

[0010] In an practicable manner, in the first step, the mixed solution B is prepared by adding the polyurethane prepolymer to the mixed solution A and stirring for 2.3 hours to 2.8 hours.

[0011] In an practicable manner, in the second step, after the curing agent is added to the mixed liquid B, the temperature is raised to 100° C.-140° C.

[0012] On the other hand, a structure of a new energy battery CCS module includes a collection circuit board and a bus bar, and a support isolation layer is provided on the collection circuit board and the bus bar. The support isolation layer is made by solidifying the organic solution described in any one of the first aspects.

[0013] In an practicable manner, the organic solvent is coated on the acquisition circuit board and the busbar by an ultrasonic spraying process.

[0014] In an practicable manner, the organic solution is cured to form the support isolation layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The modified resin material of the present application has strong adhesion to different interfaces such as metal aluminum palladium or FPC surface after melting. The liquid resin of the present application is sprayed and formed into a film by an ultrasonic spraying method, and preferably the present application adopts a crystal pressure ultrasonic spraying method, because it has strong controllability in terms of droplet uniformity and spray pattern, and is very suitable for use in the coating of the present application that requires high coating precision. The bearing strength of the liquid resin after spraying and curing into a film is also stronger than that of the flexible support skeleton. Moreover, the organic solvent of the present application also has the performance of withstanding breakdown voltage after film formation. DETAILED DESCRIPTION

[0017] Example 1, an organic solution for forming a supporting isolation layer, comprising: a first step of preparing a modified epoxy resin, wherein the modified epoxy resin is a polyurethane-modified epoxy resin, by mixing the epoxy resin with a solvent, ethylene glycol ethyl ether acetate, to form a mixed solution A, wherein the temperature of the mixed solution A is 70° C.; then, a polyurethane prepolymer is added and mixed for 2.5 hours to form a mixed solution B;

[0018] In order to better carry out the ultrasonic spraying process in the later stage, that is, the crystal pressing ultrasonic spraying method, a solvent needs to be added to the mixed liquid B for dilution. In this embodiment, the solvent is propylene glycol methyl ether acetate (PGMEA) to dilute the mixed liquid B.

[0019] The mixed solution B is heated to 140° C., and then a curing agent is added to the mixed solution B to form a mixed solution C; wherein the curing agent is dicyandiamide / 2-.

[0020] The mixed solution C was connected to a microinjection pump in a crystal ultrasonic spray method and sprayed using a Spray spray system.

[0021] Example 2. A new energy battery CCS module structure includes a collection circuit board and busbars, which are covered with a support isolation layer formed by curing the mixed solution C described in Example 1. Mixed solution C is applied to the collection circuit board and busbars using an ultrasonic spraying process. Curing is performed using a cooling process.

[0022] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

[0023] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An organic solution for preparing a supporting isolation layer, characterized in that: The first step is to prepare a modified epoxy resin, wherein the modified epoxy resin is a polyurethane modified epoxy resin, wherein the epoxy resin is mixed with a solvent ethylene glycol ethyl ether acetate to form a mixed solution A, and then a polyurethane prepolymer is added and mixed to form a mixed solution B; The second step is to add a curing agent to the mixed liquid B, the curing agent is dicyandiamide / 2-.

2. The organic solution for preparing the supporting isolation layer according to claim 1, characterized in that: The temperature of the mixed solution A in the first step is 68°C-72°C.

3. The organic solution for preparing the supporting isolation layer according to claim 2, characterized in that: In the first step, mixed solution B is prepared by adding polyurethane prepolymer to mixed solution A and stirring for 2.3 h to 2.8 h.

4. The organic solution for preparing the supporting isolation layer according to claim 3, characterized in that: In the second step, after adding curing agent to the mixed liquid B, the temperature rises to 100℃-140℃.

5. A structure of a new energy battery CCS module, characterized in that: The invention comprises a collection circuit board and a bus bar, wherein the collection circuit board and the bus bar are covered with a support isolation layer, and the support isolation layer is made by solidifying the organic solution according to any one of claims 1 to 4.

6. The structure of the new energy battery CCS module according to claim 5 is characterized in that: The organic solvent is coated on the collection circuit board and the bus bar through an ultrasonic spraying process.

7. The structure of the new energy battery CCS module according to claim 6 is characterized in that: The organic solution is cured to form a supporting isolation layer.