Manufacturing method of new energy automobile battery pack guide assembly

Abstract

The invention discloses a new energy automobile battery pack guide assembly manufacturing method which comprises the following steps that (1) a sleeve and a carrier plate are machined according to requirements, the sleeve is formed by coaxially connecting a head flange section, an interference fit section, an arc transition section and a circular truncated cone guide section in sequence from top to bottom, and an annular glue containing groove is machined in the lower end face of the head flange section; glue is injected into the annular glue containing groove; (2) a hydraulic machine is adopted to vertically press the sleeve into the assembling hole of the carrier plate, after assembling, the head flange section is located on the outer side of the assembling hole, the interference fit section, the arc transition section and the circular truncated cone guiding section are inserted into the assembling hole of the carrier plate, the interference fit section is in interference fit with the assembling hole, and the arc transition section and the circular truncated cone guiding section play a guiding role; the tail end of the circular truncated cone guide section abuts against the inner abutting face of the carrier plate, and glue in the annular glue containing groove overflows from the periphery. According to the assembling method, the assembling quality and the production efficiency can be greatly improved, the sleeve can be firmly installed, and the carrier plate is not prone to deformation.

Description

Technical Field

[0001] The present invention relates to the field of new energy vehicle battery pack manufacturing, and in particular to a method for manufacturing a guide assembly of a new energy vehicle battery pack. Background Art

[0002] New energy vehicle battery packs contain lithium batteries, and the quality of these batteries directly impacts the vehicle's service life. The guide assembly in the battery pack consists of a carrier plate and a sleeve. The sleeve is inserted into the carrier plate's mounting hole with an interference fit. Assembly requirements are as follows: the sleeve's bottom abuts against the inner abutment surface below the carrier plate's mounting hole, and the gap between the sleeve's head flange and the carrier plate's top surface must not exceed 0.5mm. After assembly, the carrier plate must not deform, and the sleeve must be securely attached to it. Existing guide assemblies suffer from low assembly precision, low production efficiency, loose sleeve assembly, and easy deformation of the carrier plate and sleeve. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for manufacturing a guide assembly for a new energy vehicle battery pack, which can greatly improve assembly quality and production efficiency, ensure that the sleeve can be firmly installed, and prevent the carrier plate from being easily deformed.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is: a method for manufacturing a guide assembly of a new energy vehicle battery pack, characterized in that the method steps are as follows: (1) Process the sleeve and carrier plate according to the following requirements. The sleeve is composed of a head flange section, an interference fit section, an arc transition section, and a frustum guide section coaxially connected from top to bottom. The inner diameter of each section is the same. The outer diameter of the tail end of the interference fit section is equal to the outer diameter of the top end of the arc transition section. The outer ring of the tail end of the arc transition section and the outer ring of the top end of the frustum guide section are tangent to each other. The taper α of the frustum guide section is 3~5°. The total length of the interference fit section, the arc transition section, and the frustum guide section is equal to Y. The tolerance range is 0 / +0.05mm, the length of the interference fit section is equal to A, A is 4-7mm, the diameter of the interference fit section is φX, and the tolerance range is +0.10 / +0.15mm; the diameter of the assembly hole on the carrier plate is φX, and the tolerance range is 0 / +0.05mm; the distance between the upper surface of the carrier plate and the inner abutment surface is equal to Y, and the tolerance range is ±0.2mm; an annular glue groove coaxial with the sleeve is machined on the lower end surface of the head flange section; glue is injected into the annular glue groove; (2) A hydraulic press is used to press the sleeve vertically into the assembly hole of the carrier plate. The pressure of the hydraulic press is 3±0.5MPa. After assembly, the head flange section is located outside the assembly hole, and the interference fit section, arc transition section, and frustum guide section are inserted into the assembly hole of the carrier plate. The interference fit section is interference fit with the assembly hole. The arc transition section and frustum guide section play a guiding role during the insertion process. The tail end of the frustum guide section is against the inner abutment surface of the carrier plate. The amount of glue in the annular glue groove can make the glue overflow from the periphery of the gap between the head flange section and the carrier plate.

[0005] Furthermore, in the aforementioned manufacturing method of the new energy vehicle battery pack guide assembly, the glue used is Debang PU-2020 two-component glue.

[0006] Furthermore, in the aforementioned method for manufacturing the guide assembly of the new energy vehicle battery pack, the taper α of the frustum guide section is 4°.

[0007] Furthermore, in the aforementioned method for manufacturing the guide assembly of the new energy vehicle battery pack, the annular width of the glue overflow is ≤2mm.

[0008] Furthermore, in the aforementioned method for manufacturing the guide assembly of the new energy vehicle battery pack, the radius of the outer wall of the arc on the arc transition section is 17 to 23 mm.

[0009] The advantages of the present invention are: the manufacturing method of the new energy vehicle battery pack guide assembly is provided with an interference fit section, an arc transition section, and a frustum guide section on the sleeve. The arc transition section and the frustum guide section can make the assembly of the sleeve smoother, thereby effectively preventing the carrier plate from deforming during the assembly process; in addition, by precisely controlling the assembly dimensions, tolerances and pressing equipment parameters, an efficient and reliable connection between the sleeve and the carrier plate is achieved, the assembly quality and production efficiency are improved, the sleeve is installed more firmly, and it is suitable for industrial mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 Schematic diagram of the structure of the sleeve.

[0011] Figure 2 Schematic diagram of the structure of the carrier board.

[0012] Figure 3 It is a structural diagram after the sleeve is inserted into the carrier plate. DETAILED DESCRIPTION

[0013] The present invention will be described in further detail below with reference to specific embodiments and accompanying drawings.

[0014] like Figure 1 、 Figure 2 、 Figure 3 As shown, the manufacturing method of the new energy vehicle battery pack guide assembly, the method steps are as follows: (1) Process the sleeve 2 and the carrier plate 1 according to the following requirements. The sleeve 2 is composed of a head flange section 3, an interference fit section 4, an arc transition section 5, and a frustum guide section 6 connected coaxially from top to bottom. The inner diameters of the various sections are the same. The outer diameter of the tail end of the interference fit section 4 is equal to the outer diameter of the top end of the arc transition section 5. The outer ring of the tail end of the arc transition section 5 and the outer ring of the top end of the frustum guide section 6 are tangent to each other. The taper α of the frustum guide section 6 is 4°. After the angle is set in this way, the frustum guide section 6 can better guide during assembly. If the angle is too large, the guiding effect will be poor. If the angle is too small, the interference fit section 6 will produce a large amount of friction when inserted into the assembly hole. The total length of the interference fit section 4, the arc transition section 5, and the frustum guide section 6 is equal to Y, with a tolerance range of 0 / +0.05mm. The length of the interference fit section 4 is equal to A, A is 5mm, and the diameter of the interference fit section 4 is φX, with a tolerance range of +0.10 / +0.15mm. The diameter of the assembly hole 8 on the carrier plate 1 is φX, with a tolerance range of 0 / +0.05mm. The distance between the upper surface of the carrier plate 1 and the inner abutment surface is equal to Y, with a tolerance range of ±0.2mm. An annular glue groove 7 coaxial with the sleeve 2 is machined on the lower end surface of the head flange section 3; glue is injected into the annular glue groove 7. (2) A hydraulic press is used to press the sleeve 2 vertically into the assembly hole 8 of the carrier plate 1. The pressure of the hydraulic press is 3±0.5MPa. After assembly, the head flange section 3 is located outside the assembly hole 8. The interference fit section 4, the arc transition section 5, and the frustum guide section 6 are inserted into the assembly hole 8 of the carrier plate 1. The interference fit section 4 is interference-fitted with the assembly hole 8. The arc transition section 5 and the frustum guide section 6 play a guiding role during the insertion process. The tail end of the frustum guide section 6 abuts against the inner abutment surface of the carrier plate 1. The gap between the head flange section 3 and the upper surface of the carrier plate 1 does not exceed 0.5mm. The amount of glue in the annular glue groove 7 can make the glue overflow from the periphery of the gap between the head flange section 3 and the carrier plate 1. The sleeve 2 is firmly assembled on the carrier plate 1 through interference fit and glue.

[0015] In this embodiment, the glue used is Debon PU-2020 two-component glue, which has excellent bonding properties and durability. The annular width of the glue overflow is ≤ 2 mm. Excessive glue may prevent the sleeve 2 from being properly press-fitted. The radius of the outer wall of the arc transition section 5 is 17 to 23 mm, preferably 20 mm. This configuration effectively reduces the impact of press-fitting.

Claims

1. A method for manufacturing a guide assembly for a new energy vehicle battery pack, characterized in that: The steps are as follows: (1) Process the sleeve and carrier plate according to the following requirements. The sleeve is composed of a head flange section, an interference fit section, an arc transition section, and a frustum guide section coaxially connected from top to bottom. The inner diameter of each section is the same. The outer diameter of the tail end of the interference fit section is equal to the outer diameter of the top end of the arc transition section. The outer ring of the tail end of the arc transition section and the outer ring of the top end of the frustum guide section are tangent to each other. The taper α of the frustum guide section is 3~5°. The total length of the interference fit section, the arc transition section, and the frustum guide section is equal to Y. The tolerance range is 0 / +0.05mm, the length of the interference fit section is equal to A, A is 4-7mm, the diameter of the interference fit section is φX, and the tolerance range is +0.10 / +0.15mm; the diameter of the assembly hole on the carrier plate is φX, and the tolerance range is 0 / +0.05mm; the distance between the upper surface of the carrier plate and the inner abutment surface is equal to Y, and the tolerance range is ±0.2mm; an annular glue groove coaxial with the sleeve is machined on the lower end surface of the head flange section; glue is injected into the annular glue groove; (2) A hydraulic press is used to press the sleeve vertically into the assembly hole of the carrier plate. The pressure of the hydraulic press is 3±0.5MPa. After assembly, the head flange section is located outside the assembly hole, and the interference fit section, arc transition section, and frustum guide section are inserted into the assembly hole of the carrier plate. The interference fit section is interference fit with the assembly hole. The arc transition section and frustum guide section play a guiding role during the insertion process. The tail end of the frustum guide section is against the inner abutment surface of the carrier plate. The amount of glue in the annular glue groove can make the glue overflow from the periphery of the gap between the head flange section and the carrier plate.

2. The method for manufacturing a guide assembly for a new energy vehicle battery pack according to claim 1, characterized in that: The glue used is Debang PU-2020 two-component glue.

3. The method for manufacturing a guide assembly for a new energy vehicle battery pack according to claim 1 or 2, characterized in that: The taper α of the frustum guide section is 4°.

4. The method for manufacturing a guide assembly for a new energy vehicle battery pack according to claim 1 or 2, characterized in that: The ring width of glue overflow is ≤2mm.

5. The method for manufacturing a guide assembly for a new energy vehicle battery pack according to claim 1 or 2, characterized in that: The radius of the outer wall of the arc on the arc transition section is 17 to 23 mm.

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