GB/T 45677-2025 PDF English
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| GB/T 45677-2025 | English | 275 |
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GB/T 45677-2025: Forming moulds of composite material for upper cover of new energy vehicle battery pack
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45677-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.120.30
CCS J 46
Forming moulds of composite material for upper cover of
new energy vehicle battery pack
Issued on: MAY 30, 2025
Implemented on: DECEMBER 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 5
4 Technical requirements... 5
5 Test methods... 10
6 Inspection rules... 12
7 Marking, packaging, transportation and storage... 13
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020,
Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents.
Please note that some of the contents of this document may involve patents. The issuing
organization of this document is not responsible for identifying patents.
This document shall be under the jurisdiction of National Technical Committee 33 on
Mold of Standardization Administration of China (SAC/TC 33).
Drafting organizations of this document. China Machinery Precision Forming Industry
Technology Research Institute (Anhui) Co., Ltd., High Shine Metal Technology Co.,
Ltd., SAIC-GM-Wuling Automobile, Xiamen Kinglong Automobile Body Co., Ltd.,
Suzhou Saiwu Application Technology Co., Ltd., Guilin Electrical Equipment
Scientific Research Institute Co., Ltd., Shanghai Jiaotong University, Wuhan Moding
Technology Co., Ltd., Huashuo Technology (Ningbo Yinzhou) Co., Ltd., Jiangnan
Great Enterprise (SZ) Mold Plastic Co., Ltd., Zhengzhou University, Ninghai Golden-
Rays Mold & Plastic Co., Ltd., Kunshan Jishan Aizu Plastic Industry Co., Ltd.,
Changshu Product Quality Supervision and Inspection Institute, Zhejiang Jiajing
Shengrui Intelligent Technology Co., Ltd., Suzhou CIMC Liangcai Technology Co.,
Ltd., Shenzhen Shengyoudeng Network Technology Co., Ltd., Taizhou Huangyan
YouLang Mould Co., Ltd, Suzhou Huashengyuan Mechanical and Electrical Co., Ltd.,
Guangdong Huayu Technology Co., Ltd., Jian Rui PengFei Precision Technology Co.,
Ltd., Dongguan Xinhaoxin Precision Industry Co., Ltd., Dongguan Yifan Hardware
Mould Co., Ltd., Ningbo Hongke Auto Parts Co., Ltd., Shenzhen Zhongxin Energy
Technology Co., Ltd., Yantai Zhenghai Hi-Tech Co., Ltd., Changzhou Dibert New
Energy Technology Co., Ltd., Jiangsu Han Gao Machinery Co., LTD., Changzhou
Institute of Technology, Airui Automobile Technology (Harbin) Co., Ltd., Fuji Chinon
M&E (Zhuhai) Co., Limited, Chongqing Lifu Auto Parts Manufacturing Co., Ltd.,
Dongguan Kunqi Precision Industry Co., Ltd., Guangdong Zhongsen Industrial
Development Co., Ltd., Xiamen Waexim Rubber Co., Ltd.
Main drafters of this document. Jiang Chao, Zhu Zhe, Wei Wei, Zhang Chuanzhong,
Zhu Lingling, Zhang Li, Zhuang Xincun, Li Peng, Deng Yangquan, Ding Jingen, Yu
Yinan, Xu Huajie, Ying Zhaohui, Li Tongyu, Gu Weixing, Lv Jiangen, Wang Zhong,
Chen Xinkai, He Xingxi, Liu Xiwang, Cai Lihua, Zhang Shengrong, Lv Wei, Liu
Jianjun, Hu Fangping, Li Liang, Zhao Xuefeng, Liu Wei, Yang Xinbing, Shen Hailin,
Bu Xiangnan, Lu Shaozhou, Liu Qiang, Zhang Wenbo, Gu Hongjun, Lan Jiashui, Zhao
Fengsong, Jin Bo, Cui Jie.
Forming moulds of composite material for upper cover of
new energy vehicle battery pack
1 Scope
This document specifies the structure, parts, assembly and performance requirements,
describes the corresponding test methods, and stipulates inspection rules, marking,
packaging, transportation and storage for forming moulds of composite material for
upper cover of new energy vehicle battery pack.
This document is applicable to the manufacture of forming moulds of composite
material for upper cover of new energy vehicle battery pack.
Note 1.The “composite material” in this document refer specifically to “resin-based
fiber-reinforced composite materials”.
Note 2.In order to avoid confusion, the "forming moulds of composite material for
upper cover of new energy vehicle battery pack" in this document is referred
to as the "moulds".
2 Normative references
The following documents, in whole or in part, are normatively referenced in this
document and are indispensable for its application. For dated references, only the
edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
GB/T 191, Packaging - Pictorial marking for handling of goods
GB/T 230.1, Metallic materials - Rockwell hardness test - Part 1.Test method
GB/T 1958, Geometrical product specifications (GPS) - Geometrical tolerance -
Verification
GB/T 3177, Geometrical product specifications (GPS) - Inspection of plain
workpiece sizes
GB/T 8845, Dies and moulds - Terminology
GB/T 11379-2008, Metallic coatings - Electroplated coatings of chromium for
engineering purposes
GB/T 40724, Terminology for carbon fiber and carbon fiber composites
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 8845 and
GB/T 40724, as well as the following apply.
3.1
upper cover of battery pack
Protective cover on the top of the power battery.
3.2
projected area of moulded part
The total projected area of the moulded part in the direction of the main pressure.
4 Technical requirements
4.1 Structure
4.1.1 Typical structure
The mould structure is shown in Figure 1.
4.1.3 Overflow system
4.1.3.1 A semicircular overflow trough shall be provided on the outside of the lower
die. Its width B shall not be less than twice the thickness δ of the moulded part; the
distance b between the overflow trough and the edge of the cavity should be preferably
10 mm ~ 20 mm, as shown in Figure 3.
4.1.3.2 A venting gap shall be reserved between the upper and lower dies. The gap value
h should be 0.3 times the thickness δ of the moulded part; the venting structure shall be
set outside the size of the moulded part blank, as shown in Figure 3.
4.3.3 The opening, closing and demoulding of the mould shall be smooth and without
interference, obstruction or abnormal noise.
4.3.4 The contact area between the limit blocks and guide plates of the upper and lower
dies shall not be less than 75%.
4.3.5 There shall be no leakage at the joints and plugs, and the external pipes shall not
interfere with other parts.
4.4 Performance
4.4.1 Vacuum degree
For moulds that require vacuuming, test according to 5.2.3.After closing the vacuum
valve for 5 minutes, the relative vacuum degree change rate shall not be greater than
10%.
4.4.2 Temperature difference
The temperature difference between two locations within 1 m of the cavity shall not be
greater than 5 ℃, and the temperature difference between two locations 1 m or more
apart shall not be greater than 10 ℃.
4.4.3 Workpiece quality
Carry out mould trial according to 5.2.5.All inspection data of the workpiece shall meet
the requirements of the customer's drawings.
4.4.4 Mould quality stability
During customer acceptance, the mould shall be able to produce continuously without
failure for no less than 60 moulds (times) or 8 hours under normal working conditions.
5 Test methods
5.1 Static test
5.1.1 Materials and hardness
5.1.1.1 Check the material report and quality certificate of the parts.
5.1.1.2 Rockwell hardness shall be determined in accordance with GB/T 230.1.
5.1.2 Dimensions and tolerances
Dimensions shall be measured according to GB/T 3177 and geometric tolerances shall
be measured according to GB/T 1958.
5.1.3 Surface treatment
The coating thickness shall be determined according to the method described in 6.4 of
GB/T 11379-2008.
5.2 Dynamic test
5.2.1 Idle running test
5.2.1.1 The mould shall be opened and closed repeatedly for not less than 10 times, and
the mould ejection mechanism shall be operated repeatedly for not less than 10 times.
Observe whether there is any interference, obstruction or abnormal noise in the
mechanism operation.
5.2.1.2 Apply blue-lead/red-lead mould oil evenly to the stop block and guide plate;
apply 30% of the rated mould clamping force to the mould; observe the contact
condition of the stop block and guide plate.
5.2.2 Tightness test
Test the pressure of the temperature control system at 1.5 times the rated pressure value
and maintain the pressure for 24 hours. Use absorbent cotton to wipe the joints and
seals; check the cleanliness of the absorbent cotton.
5.2.3 Vacuum test
Carry out a vacuum test of the mould in the following steps.
a) Under normal temperature and pressure, apply clamping force to the mould
and then evacuate the mould. The clamping force is calculated according to
Formula (1);
b) When the relative vacuum degree of the mould cavity drops to -0.06 MPa ~ -
0.1 MPa, close the vacuum valve, read the pressure counter value and record
it as p0;
c) After maintaining the pressure for 5 minutes, read the pressure gauge value
again and record it as p1;
d) Calculate the relative vacuum degree change rate Δ according to Formula (2).
Where.
F – clamping force, in kilonewtons (kN);
A – projected area of moulded part, in square meters (m2);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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