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US12573710USUSPTO Grant XML

Battery pack, method for manufacturing battery pack, and vehicle

A battery pack includes a battery pack casing, a battery cell, a barrier assembly and a filling layer, the battery cell is located in the battery pack casing and has a pole end face and an explosion-proof valve on the pole end face; the barrier assembly is installed on the battery cell and is between the pole end face and an inner surface of the battery pack casing, the inner surface of the battery pack casing, the pole end face and the barrier assembly jointly define an exhaust channel, and the explosion-proof valve is in the exhaust channel; and the filling layer is located outside the exhaust channel and is used for filling a gap between at least part of an outer surface of the battery cell and at least part of the inner surface of the battery pack casing, the filling layer is made of an adhesive colloid.

Patent

Brief

Patent brief

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Novelty

The front-page text suggests a specialized implementation detail worth closer review.

Uses

Patent review

Assignee

Xiaomi EV Technology Co., Ltd.

Published

Mar 10, 2026

Inventors

Yimiao Jiang

Domain

Mobility / storage

Plain-English summary

Problem

How can battery fires and thermal runaway in EV packs be prevented?

Solution

battery pack includes a battery pack casing, a battery cell, a barrier assembly and a filling layer, the battery cell is located in the battery pack casing and has a pole end face and an explosion-proof valve on the pole end face; the barrier assembly is installed on the battery cell and is between the pole end face and an inner surface of the battery pack casing, the inner surface of the battery pack casing, the pole end face and the barrier assembly jointly define an exhaust channel, and the explosion-proof valve is in the exhaust channel; and the filling layer is located outside the exhaust channel and is used for filling a gap between at least part of an outer surface of the battery cell and at least part of the inner surface of the battery pack casing, the filling layer is made of an adhesive colloid.

Key novelty

The front-page text suggests a specialized implementation detail worth closer review.

Applications

Patent review

Relevant search intents

9a937b37c5c6

Claims preview

1 . A battery pack, comprising: a battery pack casing; a battery cell, located in the battery pack casing, that includes a pole end face and an explosion-proof valve on the pole end face; a barrier assembly, installed on the battery cell that is located between the pole end face and an inner surface of the battery pack casing, wherein the inner surface of the battery pack casing, the pole end face and the barrier assembly jointly define an exhaust channel, and the explosion-proof valve is in the exhaust channel; and a filling layer, that is located outside the exhaust channel that fills a gap between at least part of an outer surface of the battery cell and at least part of the inner surface of the battery pack casing, wherein the filling layer is made of an adhesive colloid, so that the at least part of the outer surface of the battery cell is bonded with the at least part of the inner surface of the battery pack casing through the filling layer; and at least one battery cell group, each of the at least one the battery cell group comprises: a plurality of the battery cell, arrayed in a first direction of the battery pack casing and respective explosion-proof valves of the plurality of the battery cell in the battery cell group are arranged at intervals in the first direction; a barrier assembly arranged in one-to-one correspondence with the battery cell group, the barrier assembly comprises partition plates, the partition plates extend in the first direction, and two partition plates are respectively on two sides of the respective explosion-proof valves of each of the plurality of the battery cell in the battery cell groups in a second direction perpendicular to the first direction; and wherein two ends of the partition plates in the first direction respectively abut against the inner surface of the battery pack casing. 2 . The battery pack according to claim 1 , wherein the barrier assembly further comprises end plates, the end plates extend in the second direction, two end plates are respectively on two sides of the respective explosion-proof valves of each of the plurality of the battery cell in the battery cell group in the first direction; and the two partition plates and the two end plates constitute an annular closed structure surrounding the respective explosion-proof valves in the battery cell group. 3 . The battery pack according to claim 1 , wherein a bonding glue is on one side of the barrier assembly close to the explosion-proof valve and the assemblies are bonded to side portions of the explosion-proof valve through the bonding glue.

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