Battery pack, vehicle and control method for alleviating spreading of thermal runaway of battery pack

Patent metadata

Field	Value
Publication number	US-2022209333-A1
Application number	US-202117540262-A
Country	US
Kind code	A1
Filing date	Dec 2, 2021
Priority date	Sep 26, 2019
Publication date	Jun 30, 2022
Grant date	—

Abstract

The application discloses a battery pack, vehicle and control method for alleviating spreading of thermal runaway of a battery pack. The battery pack includes: a plurality of secondary batteries, a housing of each of which includes a weakened portion, so that a heat flow resulting from thermal runaway of the secondary battery is able to break through the weakened portion to be discharged; a spray pipeline which is arranged corresponding to and at a spacing from weakened portions of the secondary batteries, at least a portion of the spray pipeline corresponding to the weakened portions being a breakthrough region which is able to form an opening under an action of the heat flow, a spray medium in the spray pipeline being sprayed to an abnormal secondary battery in thermal runaway via the opening; where a weight A of the sprayed spray medium is determined according to an equation (0.8 A)0.85×D/B≥2.6.

First claim

What is claimed is:

1 . A battery pack, comprising:
a plurality of secondary batteries, a housing of each of which comprises a weakened portion, so that a heat flow resulting from thermal runaway of each of the plurality of secondary batteries is able to break through respective weakened portion to be discharged; a spray pipeline which is arranged corresponding to and at a spacing from weakened portions of the plurality of secondary batteries, at least a portion of the spray pipeline corresponding to the weakened portions being a breakthrough region which is able to form an opening under an action of the heat flow, a spray medium in the spray pipeline being sprayed to an abnormal secondary battery in thermal runaway via the opening; wherein a weight A of the spray medium which is sprayed to alleviate spreading of the thermal runaway of the abnormal secondary battery is determined according to an equation (1),

(

0.8
⁢
A

)

0.85

×
D

B

⩾
2.6

(
1
)

in which, A indicates the weight of the spray medium by kg; D indicates a latent heat of the spray medium by kJ/kg; B indicates a capacity of a secondary battery of the plurality of secondary batteries by Ah.

2 . The battery pack according to claim 1 , wherein

2.6
⩽

(

0.8
⁢
A

)

0.85

×
D

B

⩽

17.48
.

3 . The battery pack according to claim 2 , wherein

2.63
⩽

(

0.8
⁢
A

)

0.85

×
D

B

⩽

5.36
.

4 . The battery pack according to claim 1 , wherein the latent heat D of the spray medium is above 100 kJ/kg.

5 . The battery pack according to claim 1 , wherein a spray pressure P of the spray pipeline is determined according to an equation (2),

P

(

0.06
⁢
B

+
5

)

⩾
1

(
2
)

in which, P indicates the spray pressure of the spray pipeline by kPa.

6 . The battery pack according to claim 5 , wherein

P

(

0.0
⁢
B

+
5

)

⩾

1.4
.

7 . The battery pack according to claim 1 , wherein the spray pressure P of the spray pipeline is above 10 kPa.

8 . The battery pack according to claim 1 , wherein the breakthrough region of the spray pipeline faces directly towards the weakened portions of the plurality of secondary batteries.

9 . The battery pack according to claim 1 , wherein the spray medium is one or more selected from: fire-control gas, fire-control liquid, fire-control colloid and fire-control powder.

10 . The battery pack according to claim 1 , wherein the battery pack further comprises a storage case;
the spray pipeline is configured to be connected to the storage case and at least a portion of the spray pipeline is located above the plurality of secondary batteries; or the spray pipeline comprises a plurality of pipeline units arranged in parallel, each of which is arranged corresponding to at least one of the plurality of secondary batteries and is configured to connect to the storage case.

11 . The battery pack according to claim 10 , wherein the storage case is arranged higher than the breakthrough region of the spray pipeline.

12 . The battery pack according to claim 10 , wherein the storage case comprises:
a case body comprising a cavity; a separator located in the cavity of the case body, the separator separating the case body into a liquid storage part and a gas storage part, wherein the liquid storage part is in communication with the spray pipeline, the gas storage part comprising an inlet for inflow of a compressed gas, the separator being able to drive the spray medium in the liquid storage part into the spray pipeline under an action of the compressed gas in the gas storage part.

13 . The battery pack according to claim 12 , wherein
the separator is an elastic separator film; or the separator is a separator plate slidably connected to an inner wall of the case body.

14 . The battery pack according to claim 13 , wherein the elastic separator film is an involucra.

15 . The battery pack according to claim 10 , wherein the storage case comprises:
a case body comprising a cavity; a drive device disposed in the cavity of the case body, the drive device comprising an elastic member and a drive member, the elastic member being connected to the drive member, the drive member and a wall of the storage case enclosing and forming a liquid storage part in communication with the spray pipeline; where

Assignees

• Contemporary Amperex Technology Co Ltd

Inventors

• Huang Xiaoteng
• Hong Jiarong
• Wang Wenli
• Xiang Yanhuo

Classifications

• H01M10/613

  Cooling or keeping cold · CPC title

• A62C3/07

  in vehicles, e.g. in road vehicles · CPC title

• B60L3/0046

  relating to electric energy storage systems, e.g. batteries or capacitors · CPC title

• H01M2220/20

  Batteries in motive systems, e.g. vehicle, ship, plane · CPC title

• H01M10/651

  characterised by parameters specified by a numeric value or mathematical formula, e.g. ratios, sizes or concentrations · CPC title