# US 12,113,236 B2 · Exhaust filter system for battery pack

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- Number: US 12,113,236 B2
- Document ID: US12113236B2
- Status: Granted
- Kind: B2
- Application number: 17/620,709
- Filed: 2020-08-27
- Published: 2022-12-22
- Granted: 2024-10-08
- Earliest claimed: 2020-08-27
- Assignees: Yantai Chungway New Energy Technology Co., Ltd.
- Applicants: Yantai Chungway New Energy Technology Co., Ltd.
- Inventors: Lilei Zhang; Hongbo Chang; Yechao Tan; Yunqi Liu
- Web page: https://patentgrep.com/patent/US12113236B2

## CPC

- H01M 50/394: {Gas-pervious parts or elements}
- B01D 46/12: in multiple arrangements
- B60L 3/0046: {relating to electric energy storage systems, e.g. batteries or capacitors}
- B60L 50/64: Constructional details of batteries specially adapted for electric vehicles
- H01M 50/249: specially adapted for aircraft or vehicles, e.g. cars or trains (constructional details of batteries specially adapted for electric vehicles B60L50/64)
- H01M 50/30: Arrangements for facilitating escape of gases
- H01M 50/35: Gas exhaust passages comprising elongated, tortuous or labyrinth-shaped exhaust passages
- H01M 50/358: External gas exhaust passages located on the battery cover or case
- H01M 50/383: Flame arresting or ignition-preventing means
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02E 60/50: Fuel cells
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28)
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

Disclosed is an exhaust filter system for a battery pack, including an explosion-proof valve and a filter apparatus. One end of the explosion-proof valve is connected to a battery pack- and the other end is connected to the filter apparatus. The filter apparatus includes an introduction port, a discharge port, a housing, and a filter mechanism. The introduction port and the discharge port are separately disposed at two ends of the housing. The filter mechanism is disposed inside the housing and is provided with a plurality of filter holes. The present invention has the following beneficial effects: by optimal design of a novel explosion-proof valve and a novel filter apparatus, expanding the applicability of technical solutions of this application, solving the problem of fire induced by thermal runaway, exhausting combustion gas more smoothly, and achieving better effects of filtering and post handling for thermal runaway in a battery pack.

## Claims

### Claim 1

An exhaust filter system for a battery pack, comprising an explosion-proof valve and a filter apparatus, wherein one end of the explosion-proof valve is connected to a battery pack, the other end of the explosion-proof valve is connected to the filter apparatus, the filter apparatus comprises an introduction port, a discharge port, a housing, and a filter mechanism, the introduction port and the discharge port are separately disposed at two ends of the housing, the filter mechanism is disposed inside the housing, and the filter mechanism is provided with a plurality of filter holes, and
wherein the filter mechanism comprises a first filter plate unit and a second filter plate unit, the first filter plate unit and the second filter plate unit are separately disposed on two sides of the filter mechanism in a conveyance direction, the first filter plate unit comprises at least two first filter plates disposed at an interval, the second filter plate unit comprises at least two second filter plates disposed at an interval, in the conveyance direction of the filter mechanism, the at least two first filter plates are arranged in descending order of hole diameters of the filter holes, and the at least two second filter plates are arranged in descending order of hole diameters of the filter holes.

### Claim 2 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein in the conveyance direction perpendicular to the filter mechanism, a gap is provided between the first filter plates and the closest second filter plates, and the gap is used for the passage of combustion gas during thermal runaway in the battery pack.

### Claim 3 (depends on 2)

The exhaust filter system for a battery pack according to claim 2, wherein a sum of a ventilation area of the holes in a single first filter plate, a ventilation area of the holes in an adjacent second filter plate and an effective ventilation area of a single gap forms a single-layer ventilation area of the filter mechanism, and the single-layer ventilation area is greater than a cross-sectional area of the introduction port.

### Claim 4 (depends on 2)

The exhaust filter system for a battery pack according to claim 2, wherein the effective ventilation area of the gap is greater than the cross-sectional area of the introduction port.

### Claim 5 (depends on 2)

The exhaust filter system for a battery pack according to claim 2, wherein an included angle is formed between the first filter plate and a side wall of the housing in a length direction, the included angle is greater than 0° and smaller than 180°, the ventilation area of the first filter plate is greater than the cross-sectional area of the introduction port, an included angle is formed between the second filter plate and the side wall of the housing in the length direction, the included angle is greater than 0° and smaller than 180º, and the ventilation area of the second filter plate is greater than the cross-sectional area of the introduction port.

### Claim 6 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein a minimum diameter of the filter holes is less than 0.428 mm.

### Claim 7 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein the first filter plate adjacent to the introduction port completely covers a linear combustion gas passage of the introduction port.

### Claim 8 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein in the conveyance direction of the filter mechanism, the hole centers of the filter holes in two longitudinally adjacent first filter plates are arranged in an unaligned manner, and the hole centers of the filter holes in two longitudinally adjacent second filter plates are arranged in an unaligned manner.

### Claim 9 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein the exhaust filter system for a battery pack further comprises an exhaust pipe, and the exhaust pipe is used for connecting the explosion-proof valve with the filter apparatus.

### Claim 10 (depends on 9)

The exhaust filter system for a battery pack according to claim 9, wherein the exhaust pipe is made of a material that withstands high pressure and high temperature.

### Claim 11 (depends on 10)

The exhaust filter system for a battery pack according to claim 10, wherein the exhaust pipe is made of stainless steel.

### Claim 12 (depends on 9)

The exhaust filter system for a battery pack according to claim 9, wherein a cross-sectional area of the exhaust pipe is smaller than or equal to a cross-sectional area of the filter apparatus.

### Claim 13 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein the exhaust filter system for a battery pack further comprises a fire coupling, and the fire coupling is connected to the discharge port of the filter apparatus.

### Claim 14 (depends on 1)

The exhaust filter system for a battery pack according to claim 1, wherein the explosion-proof valve comprises a frame, a seal gasket, and a waterproof breathable film, the seal gasket and the waterproof breathable film are separately disposed on the frame, the seal gasket is used for a sealed connection between the explosion-proof valve and the battery pack, and the waterproof breathable film is used for pressure relief during thermal runaway in the battery pack.