Split type sealing splicing structure and method for plastic upper cover of energy storage battery box

Abstract

The invention belongs to the technical field of energy storage battery boxes, and particularly relates to a split type sealing splicing structure and method for an energy storage battery box plastic upper cover, the split type sealing splicing structure comprises a front part main body and a rear part main body, the rear part main body is provided with a lap joint structure, and the lap joint structure is provided with a glue groove structure; the front part main body and the rear part main body are fixedly connected through a lap joint structure, and the glue groove structure is filled with an adhesive. The plastic upper cover has the advantages that the plastic upper cover is suitable for the 1p104s energy storage battery box, the split structure connection of the plastic upper cover of the energy storage battery box is realized, the structural strength required by product application is met, the mass production difficulty of products is reduced, and the economic benefit of the products is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of energy storage battery boxes, and specifically relates to a split-type sealing splicing structure and method for a plastic upper cover of an energy storage battery box. Background Art

[0002] With the continuous upgrading and iteration of energy storage market products and the increasing demand for cost reduction and efficiency improvement, the increase in the capacity of single battery cells has enabled the capacity of energy storage system containers to exceed the 5MWh mark. However, market competition is becoming increasingly fierce. In order to further improve the energy density of single containers, increase the proportion of battery cell volume, and reduce the volume of plastic structural parts, the energy storage industry is exploring technical solutions for upgrading 1p52s battery packs to 1p104s battery packs.

[0003] However, the industry upgrade faces huge challenges. First, the increase in product size means that the scale of molds and machine equipment must also be expanded accordingly, and the corresponding forming processing difficulty and product quality control difficulty will also increase accordingly.

[0004] At present, the mainstream in the industry adopts SMC compression molding and one-piece injection molding solutions, but both have many disadvantages. The SMC compression molding solution has problems such as low molding appearance quality, uneven wall thickness, and strength risks; the one-piece injection molding solution has risks such as low appearance quality, low production efficiency, high molding defect rate, high scrap rate and high cost. It can be seen that the plastic cover of the 1p104s battery pack used by the mainstream solution cannot well meet the huge production needs of the current energy storage market. Summary of the invention

[0005] The purpose of the present invention is to provide a new split production scheme suitable for the plastic upper cover of the 1p104s energy storage battery box. The split structure of the plastic upper cover of the energy storage battery box fills the gap in the existing technical field, reduces the difficulty of mass production of the product, and improves the economic benefits of the product.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: A split sealed splicing structure of a plastic upper cover of an energy storage battery box comprises a front main body and a rear main body, the rear main body is provided with an overlap structure, the overlap structure is provided with a glue groove structure, the front main body and the rear main body are fixedly connected by the overlap structure, and the glue groove structure is filled with adhesive.

[0007] Preferably, the front main body is evenly provided with a plurality of positioning ribs, and the rear main body is provided with corresponding positioning grooves, and the positioning grooves and the positioning ribs constitute the positioning structure for precise positioning of the front and rear main body assemblies.

[0008] Preferably, a plurality of welding structures are provided at the bottom of the rear portion body, and the welding structures are spaced apart from the positioning grooves.

[0009] Preferably, the glue groove structure is located in the middle of the overlap structure. Assuming that the width of the overall overlap structure is b , the positioning groove width is , the number is n, and the length of the welded structure is d , and its calculation formula is as follows: .

[0010] A split sealing splicing method for a plastic upper cover of an energy storage battery box comprises the following steps: S1. Surface treatment of the glue coating position; S2. Apply two-component structural adhesive to the glue-coated area of ​​the rear body; S3. Compare the front part of the main body with the back part of the main body; S4. Press the glue coating position; S5.Use ultrasonic puncture welding; S6. After the glue has cured for 24 hours, perform an airtightness test on the entire assembled upper cover, and the leakage value should be less than 100Pa.

[0011] Preferably, in step S1, flame or ion treatment is performed on the glue coating positions of the front part body and the rear part body.

[0012] Preferably, in S4, the gluing position is pressed, and a set of pressing tooling is made by profiling the inner surface of the joint position of the plastic upper cover. After the rear part of the upper cover is glued, it is turned upside down on the table, and the front part and the rear part of the upper cover after surface treatment are connected. After the connection, the profiling pressing tooling is pressed down, and the cylinder is pressed down to apply a pressure of >200N to press the glued area for 3 minutes to ensure that all surfaces are tightly pressed and there is no gap or looseness after pressing.

[0013] Preferably, in step S5, when ultrasonic puncture welding is used, the ultrasonic frequency is 20-30 kHz, the amplitude is 50-70 microns, the welding time is 2-5s, and the welding pressure depth is 1-3mm.

[0014] Preferably, in step S6, it is assumed that the overall strength of welding and gluing is The standard value for air tightness test of plastic cover is E. E= , , where is the welding strength, is the adhesive strength, ; In the formula, is the single point welding strength, shear force 500N, pull-out force 150N, is the single point welding area, ; In the formula, is the bonding strength of the adhesive spline, is the adhesive area, .

[0015] Compared with the prior art, the present invention has the following beneficial effects: High quality of molding appearance: the integrated upper cover is divided into two parts, the difficulty of injection molding production is low, and the quality of product appearance is guaranteed; High injection molding efficiency: the size of a single finished product is relatively small, the molding process is stable, and the molding efficiency is high; Controllable production costs: low scrap rate of single finished products, low scrap rate of assembled finished products, high overall yield rate, controllable costs, and cost savings; Consistent and reliable performance: The injection molding and assembly production processes are stable, and the product strength and sealing are consistent and reliable.

[0016] In summary, the new split energy storage battery box plastic cover described in the present application has higher molding appearance quality, higher molding efficiency, more controllable production cost and more stable and consistent product performance, and therefore has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a top view of the plastic upper cover of the energy storage battery box in an embodiment of the present invention.

[0018] Figure 2 It is a cross-sectional view of the plastic upper cover of the energy storage battery box in an embodiment of the present invention.

[0019] Figure 3 It is a cross-sectional view of the overlapping position of the plastic upper cover of the energy storage battery box in an embodiment of the present invention.

[0020] Figure 4 It is a bottom view of the plastic upper cover of the energy storage battery box in an embodiment of the present invention.

[0021] Figure 5 This is the simulated strain cloud diagram of the upper cover.

[0022] Figure 6 This is the simulated stress cloud map of the upper cover.

[0023] In the figure, 1-plastic upper cover of the energy storage battery box, 2-front part main body, 3-rear part main body, 4-lap joint structure, 5-first surface, 6-third surface, 7-glue groove structure, 8-positioning groove, 9-positioning rib, 10-second surface, 11-ultrasonic welding structure, 12-positioning structure. DETAILED DESCRIPTION

[0024] In order to more clearly illustrate the technical features of this solution, this solution is described below through specific implementation methods.

[0025] A split sealed splicing structure of a plastic upper cover of an energy storage battery box, such as Figure 1 As shown, it includes a front main body 2 and a rear main body 3.

[0026] like Figure 2 As shown, the front part main body 2 and the rear part main body 3 of the plastic upper cover 1 of the energy storage battery box are overlapped and spliced ​​through the overlap structure 4 on the rear part main body 3.

[0027] like Figure 3 , Figure 4 As shown, the sealed splicing structure includes a uniform wall thickness overlap structure 4, a glue groove structure 7, a welding structure using an ultrasonic welding structure 11, and a positioning structure 12. The sealed splicing of the front part body 2 and the rear part body 3 is achieved through the four structures.

[0028] The surface of the overlapping structure 4 in contact with the front part main body 2 is set as a first surface 5, and a glue groove 7 is provided on the first surface 5 for sealing and bonding the front and rear parts of the main body.

[0029] The surface of the overlap structure 4 that is not in contact with the front part main body 2 is set as a second surface 10, and an ultrasonic welding structure 11 is provided on the second surface 10 for welding and splicing the front and rear parts of the main body.

[0030] The surface of the front main body 2 in contact with the first surface 5 is set as the third surface 6, and the first surface 5 is provided with a positioning groove 8; the third surface 6 is provided with a positioning rib 9, and the positioning groove 8 and the positioning rib 9 constitute the positioning structure 12, which is used for precise positioning of the assembly and splicing of the front and rear main bodies.

[0031] The glue groove structure is located in the middle of the overlap structure. Assuming that the overlap structure width is b , the positioning groove width is , the number is n, and the diameter of the welded structure is d , and its calculation formula is as follows: .

[0032] The front main body 2 and the rear main body 3 are spliced ​​front to back. First, the adhesive is filled into the glue groove structure 7, and then the positioning groove 8 of the positioning structure 12 is aligned with the positioning rib 9 to achieve precise positioning. The overlapping structure 4 on the rear main body 3 is used for splicing and overlapping, and then the ultrasonic welding structure 11 is used for welding connection. The above operations realize the sealed splicing connection of the front and rear main bodies of the energy storage battery box.

[0033] A split sealing splicing method for a plastic upper cover of an energy storage battery box comprises the following steps: S1. Surface treatment is performed on the glue coating position; flame or ion treatment is performed on the glue coating position of the front part body and the rear part body.

[0034] S2. Apply two-component structural adhesive to the glue-coated area of ​​the rear body; S3. Compare the front part of the main body with the back part of the main body; S4. Press the glue-coated position; make a set of pressing tools by profiling the inner surface of the joint position of the plastic upper cover. After the upper cover is glued, put it upside down on the table, and connect the front and rear parts of the upper cover after surface treatment. After the connection, press the pressing tool with the profiling method downward, and apply a pressure of more than 200N by the cylinder to press the glue-coated area for 3 minutes to ensure that all surfaces are tightly pressed and there is no gap or looseness after pressing.

[0035] S5. Use ultrasonic puncture welding; when using ultrasonic puncture welding, in step S5, when using ultrasonic puncture welding, the ultrasonic frequency is: 10-20kHz; the amplitude is 5-25 microns, the welding time is 3s; the welding pressure depth is 1.5mm.

[0036] S6. After the glue has cured for 24 hours, perform an airtightness test on the entire assembled upper cover, and the leakage value should be less than 100Pa.

[0037] Assume that the overall strength of welding and bonding is The standard value for air tightness test of plastic cover is E. E= , , In the formula, is the welding strength, is the adhesive strength, ; In the formula, is the single point welding strength, shear force 500N, pull-out force 150N, is the single point welding area, ; In the formula, is the bonding strength of the adhesive spline, is the adhesive area, .

[0038] Through simulation analysis, the bonding strength of welding + gluing is greater than 5MPa, so there is no risk of detachment due to the inflation pressure inside the plastic upper cover during airtightness testing. Example

[0039] Airtightness testing standards: Make a flat pressing tooling to contact the upper surface of the plastic cover horizontally. During the airtightness test, the flat pressing tooling is first contacted and pressed tightly with the plastic cover, then the airtightness tester is started, and the air pressure in the plastic cover is inflated to reach >3.5kPa. After the air pressure is balanced, the test is carried out, and the leakage value is <100pa within 60s.

[0040] Welding size: Single point welding size: 14m×7mm.

[0041] Overall welding points: 20.

[0042] Single point welding strength: shear force ≥500N, pull-out force ≥150N.

[0043] Glue coating size: Glue coating area: 1600mm×10mm.

[0044] Glue groove depth: 0.3mm.

[0045] Surface treatment: flame treatment / plasma treatment.

[0046] Two-component structural adhesive: After the specimens are bonded, they are cured for 24 hours and the shear strength is measured to be >5MPa.

[0047] Figure 5 , Figure 6 The simulation is of the stress state of the product during the inflation process during the airtightness test. The strain cloud diagram is used to determine the deformation of the product, and the stress cloud diagram is used to determine the internal stress of the product. It can be seen from the figure that the effect is good under this parameter setting.

[0048] Technical features not described in the present invention can be achieved through or by adopting existing technologies and will not be described in detail here. Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by ordinary technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A split sealed splicing structure of a plastic upper cover of an energy storage battery box, characterized in that: It comprises a front main body and a rear main body, the rear main body is provided with an overlap structure, the overlap structure is provided with a glue groove structure, the front main body and the rear main body are fixedly connected via the overlap structure, and the glue groove structure is filled with adhesive.

2. The split sealed splicing structure of the plastic upper cover of the energy storage battery box according to claim 1 is characterized in that: The front main body is evenly provided with a plurality of positioning ribs, and the rear main body is provided with corresponding positioning grooves. The positioning grooves and the positioning ribs constitute the positioning structure, which is used for accurate positioning of the front and rear main bodies during assembly and splicing.

3. The split sealed splicing structure of the plastic upper cover of the energy storage battery box according to claim 2 is characterized in that: A plurality of welding structures are arranged at the bottom of the rear part body, and the welding structures are spaced apart from the positioning grooves.

4. The split sealed splicing structure of the plastic upper cover of the energy storage battery box according to claim 3 is characterized in that: The glue groove structure is located in the middle of the overlap structure. Assuming that the overlap structure width is b , the positioning groove width is , the number is n , the length of the welded structure is d , and its calculation formula is as follows: 。 5. A split-type sealing splicing method for a plastic upper cover of an energy storage battery box, applicable to the split-type sealing splicing structure of the plastic upper cover of an energy storage battery box according to any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Surface treatment of the glue coating position; S2. Apply two-component structural adhesive to the glue-coated area of ​​the rear body; S3. The front body and the rear body are aligned with each other to achieve precise positioning by aligning the positioning groove with the positioning rib; S4. Press the glue coating position; S5.Use ultrasonic puncture welding; S6. After the glue has cured for 24 hours, perform an airtightness test on the entire assembled upper cover, and the leakage value should be less than 100Pa.

6. The split sealing splicing method of the energy storage battery box plastic upper cover according to claim 5 is characterized in that: In step S1, flame or ion treatment is performed on the glue coating positions of the front part body and the rear part body.

7. The split sealing splicing method of the energy storage battery box plastic upper cover according to claim 5 is characterized in that: In step S4, a pressure of >200N is applied to press the glue-coated area for 3 minutes to ensure that all surfaces are tightly pressed together and there is no gap or looseness after pressing.

8. The split sealing splicing method of the energy storage battery box plastic upper cover according to claim 5 is characterized in that: In step S5, when ultrasonic puncture welding is used, the ultrasonic frequency is: 20-30kHz; the amplitude is 50-70 microns, the welding time is 2-5s; and the welding pressure depth is 1-3mm.

9. The split sealing splicing method of the energy storage battery box plastic upper cover according to claim 5, characterized in that: In step S6, it is assumed that the overall strength of welding and gluing is The standard value for air tightness test of plastic cover is E. E= ， ， In the formula, is the welding strength, is the adhesive strength, ； In the formula, is the single point welding strength, shear force 500N, pull-out force 150N, is the single point welding area, ； In the formula, is the bonding strength of the adhesive spline, is the adhesive area, 。

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