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GB/T 45677-2025Forming moulds of composite material for upper cover of new energy vehicle battery pack (English PDF)

新能源汽车电池包上盖复合材料成型模

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

May 30, 2025

Implementation date

December 1, 2025

Scope

GB/T 45677-2025 is the English-translated version of 新能源汽车电池包上盖复合材料成型模.

China's national standard for the composite forming moulds used to make the upper cover of an electric vehicle battery pack. The cover has become a composite part for the reasons that decide most electric vehicle design questions: it is a large flat panel high on the vehicle, so replacing steel with resin-based fibre-reinforced composite takes weight off the top of the pack, and the composite additionally insulates electrically and thermally, which matters directly for a component sitting over the cells. Producing it needs a mould that holds a large area to a tolerance the pack's sealing depends on, distributes heat evenly enough to cure the resin uniformly, and survives the pressures and cycle counts of series production. The standard specifies the structure, parts, assembly and performance requirements of such moulds, describes the corresponding test methods, and sets out the inspection rules, marking, packaging, transport and storage provisions.

Document preview — GB/T 45677-2025

National Standard of the People's Republic of China

ICS: 25.120.30
Classification: J46

Issued by: State Administration for Market Regulation; Standardization Administration of the PRC

1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
4.1 Structure
4.1.3 Overflow system
4.4 Performance
5 Test methods
5.1 Static test
5.1.1 Materials and hardness
5.2 Dynamic test
5.2.1 Idle running test
5.2.2 Tightness test Test the pressure of the temperature control system at
6 Inspection rules...
7 Marking, packaging, transportation and storage...

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

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.

4.1 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 delta 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 delta 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 °C, and the temperature difference between two locations 1 m or more apart shall not be greater than 10 °C.

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.

5.1.1 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.

5.2.1 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;

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Note 3. 10. **Verification (USD

Notes and Explanations

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 17 pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 11379-2008

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