Vehicle traction battery over-discharge diagnosing method and assembly

Patent metadata

Field	Value
Publication number	US-11262408-B2
Application number	US-202016799120-A
Country	US
Kind code	B2
Filing date	Feb 24, 2020
Priority date	Feb 24, 2020
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

An over-discharge diagnosing method includes, among other things, evaluating concurrently, a voltage behavior of a battery pack, a current behavior of the battery pack, and a temperature behavior of the battery pack. The method further includes detecting an over-discharge based on the evaluating, and communicating an over-discharge notification in response to the detecting.

First claim

What is claimed is:

1. An over-discharge diagnosing method, comprising:
evaluating concurrently, a voltage behavior of a battery pack, a current behavior of the battery pack, and a temperature behavior of the battery pack;
detecting an over-discharge based on the evaluating;
communicating an over-discharge notification in response to the detecting; and
detecting the over-discharge based on a current change rate being zero or negative, and a voltage change rate being zero or negative and less than a voltage threshold value.

2. The method of claim 1 , wherein the detecting does not occur unless a current value of the battery pack is negative and a state of charge change rate of the battery pack is zero or negative.

3. The method of claim 1 , further comprising detecting the over-discharge based on a state of charge of the battery pack being less than a state of charge threshold.

4. The method of claim 1 , further comprising detecting the over-discharge based on a temperature change rate of the battery pack being greater than or equal to a predefined threshold.

5. The method of claim 1 , further comprising reducing current in response to the over-discharge notification.

6. The method of claim 5 , further comprising opening contactors of the battery pack in response to the over-discharge notification.

7. The method of claim 1 , further comprising opening contactors of the battery pack in response to the over-discharge notification.

8. The method of claim 1 , further comprising transmitting an alert to a user in response to the over-discharge notification.

9. The method of claim 1 , wherein the over-discharge detected during the detecting is an over-discharge of a battery cell within the battery pack.

10. The method of claim 1 , wherein the battery pack is a traction battery pack of an electrified vehicle.

11. An over-discharge diagnosing method, comprising:
evaluating concurrently, a voltage behavior of a battery pack, a current behavior of the battery pack, and a temperature behavior of the battery pack;
detecting an over-discharge based on the evaluating;
communicating an over-discharge notification in response to the detecting; and
detecting the over-discharge based on a current change rate being both positive and greater than a threshold current change rate, and a voltage change rate being positive but less than a voltage threshold.

12. An over-discharge diagnosing assembly, comprising:
a battery pack; and
a controller configured to detect an over-discharge by evaluating, concurrently, a voltage behavior, a current behavior, and a temperature behavior of the battery pack,
the controller further configured to communicate an over-discharge notification in response to the controller detecting the over-discharge,
wherein the controller is configured to detect the over-discharge based on a current change rate being both positive and greater than a threshold current change rate, and a voltage change rate being positive but less than a voltage threshold.

13. The assembly of claim 12 , wherein the battery pack is a traction battery pack of an electrified vehicle.

14. The assembly of claim 12 , further comprising contactors configured to open in response to the controller detecting the over-discharge.

15. The assembly of claim 12 , wherein the controller is a bussed electrical center.

16. The assembly of claim 12 , wherein the over-discharge is an over-discharge of at least one battery cell within the battery pack.

Assignees

• Ford Global Tech Llc

Inventors

• Zhu Di
• Hosseinifar Mehdi

Classifications

• H02J7/63

  against overdischarge · CPC title

• H01M50/572

  Means for preventing undesired use or discharge · CPC title

• H01M10/486

  for measuring temperature · CPC title

• H02J2105/37

  exchanging power with electric vehicles [EV] or with hybrid electric vehicles [HEV] · CPC title

• H02J7/80

  including monitoring or indicating arrangements · CPC title