GB/T 33341-2025The swapping battery pack rack of electric vehicle (English PDF)

3.1 Swappable battery systems; SBS

A device that consists of several cells or power battery modules, a pack, a battery information collection unit, and related electrical and mechanical accessories, etc.

NOTE: Referred to as a battery pack.

[SOURCE: GB/T 29317-2021, 8.1.1]

3.2 Battery pack rack

A mechanical device that is used to carry a swapping battery pack.

NOTE: This typically includes a swapping battery pack connector, guides, and other positioning mechanisms. It provides charging, storage, and monitoring functions.

5.1 General requirements

5.1.1 The battery pack rack shall have battery pack position limiting and guiding functions.

5.1.2 The battery pack rack shall be able to automatically and accurately connect to the battery pack and prevent incorrect insertion.

5.1.3 The battery pack rack shall have electrical and communication connection functions with the battery pack charger.

5.1.4 The battery pack rack shall have the function of detecting the battery pack's position and storage status and may have a temperature detection function.

5.1.5 The battery pack rack should have drainage functions to prevent water from accumulating inside the battery pack rack or flowing into electrical equipment.

5.1.6 The battery pack rack may be equipped with an automatic dust cover that automatically closes when no battery box is present.

5.1.7 The battery pack rack should have the load capacity to safely transfer and transport the battery pack.

5.2 Connectors for battery pack rack

The battery pack rack shall have electric connectors and may have liquid connectors. The structure and performance shall comply with the provisions of Clause 7 of GB/T 32879-2025.

5.3 Wiring harness

5.3.1 The low-voltage wiring harness for the battery pack rack shall comply with the provisions of Clause 4 in QC/T 29106-2014.

5.3.2 The power cables for the battery pack rack shall be able to withstand the dielectric strength test in 9.8; and no insulation breakdown or flashover shall occur during the test.

5.3.3 The flame retardancy and fire resistance of the cables for the battery pack rack shall comply with the provisions of GB/T 19666-2019 and shall be heat-resistant, waterproof, corrosion-resistant, and anti-oxidation.

5.3.4 Power cables and low-voltage wiring harnesses shall be bundled and isolated separately, and routed smoothly.

5.3.5 Signal cables shall be shielded and twisted in pairs to prevent interference.

5.4 Grounding

5.4.1 The battery pack rack's frame, electrical components, and connector metal casings shall be effectively grounded, with a connection impedance of no greater than 0.1 ohm.

5.4.2 The battery pack rack's metal frame shall be equipped with grounding bolts with a diameter of no less than 8 mm and marked with a grounding mark.

8.1 Mechanical requirements for battery pack rack for commercial vehicle

8.1.1 After the battery pack rack and battery pack are coupled completely, the matching clearance between the guide mechanism and the battery pack shall be no greater than 5 mm.

8.1.2 The vertical height of the guide mechanism of the battery pack rack shall match the battery pack.

8.1.3 After undergoing the mechanical impact test in accordance with 9.11.1, the battery pack rack shall meet the following requirements:

a) The battery pack rack shall show no visible cracks;

b) The connector shall show no visible cracks, no apparent looseness during installation, and no visible deformation of the connector terminals;

c) The insulation resistance shall meet the requirements of 5.6.

8.2 Mechanical requirements battery pack rack for passenger car

8.2.1 After the battery pack rack and battery pack for passenger car are coupled completely, the matching clearance between the guide mechanism and the battery pack shall be no greater than 5 mm.

8.2.2 When high-strength bolts are used to connect load-bearing components, the high-strength bolts, nuts, and washers shall comply with the provisions of GB/T 1231.

9.1 Test conditions

9.1.1 Unless otherwise specified, specimens shall be tested at an ambient temperature of (25±5)°C and a relative humidity of 5% ~ 95%.

9.1.2 The accuracy of all test instruments and equipment shall be at least one magnitude higher than the accuracy of the parameter being measured, or the error shall be less than 1/3 of the allowable error of the parameter being measured.

9.2 General test

Visually inspect whether the battery pack rack has position limiting and guiding devices, whether has anti-incorrect insertion devices for connection to the battery pack; whether has electrical connections and communication junction interfaces with the battery pack charger; whether has battery pack status monitoring devices; whether has temperature detection devices, drainage devices, and dust covers; and whether is capable of safely supporting the battery pack.

9.3 Battery pack rack connector test

Battery pack rack connector tests shall be conducted in accordance with the provisions of Clause 8 of GB/T 32879-2025.

9.4 Wiring harness test

9.4.1 Low-voltage wiring harness test shall be conducted in accordance with the provisions of Clause 5 in QC/T 29106-2014.

9.4.2 Flame retardancy and fire resistance tests for battery pack rack cables shall be conducted in accordance with the provisions of GB/T 19666-2019.

9.5 Grounding test

Perform the grounding test in the following steps:

a) Use a gauge or vernier caliper to measure the diameter of the grounding bolt and check the grounding mark.

b) Use an electric bridge, ground resistance tester, or digital low-resistance tester to measure the resistance between any conductive part within the battery pack rack and the main grounding point. The number of measurement points shall be at least 3 (including the furthest point).

9.6 Clearance and creepage distance tests

Clearance and creepage distance tests shall be conducted in accordance with the provisions of 6.8 in GB/T 16935.1-2023.

9.7 Insulation resistance test

It shall be conducted in accordance with the provisions of 12.2 in GB/T 18487.1-2023.

9.8 Dielectric strength test

It shall be conducted in accordance with the provisions of 12.3 in GB/T 18487.1-2023. […]