Power supply system

Patent metadata

Field	Value
Publication number	US-2023099142-A1
Application number	US-202218073744-A
Country	US
Kind code	A1
Filing date	Dec 2, 2022
Priority date	Jun 4, 2020
Publication date	Mar 30, 2023
Grant date	—

Abstract

A power supply system includes an assembled battery, a positive electrode-side power supply path, a negative electrode-side power supply path, and a capacitor unit. The capacitor unit includes a series connection of a plurality of capacitors having one end connected to the positive electrode power supply path and the other end connected to the negative electrode power supply path. An inter-capacitor connection point located between the capacitors forming the series connection is electrically connected to the inter-cell connection point.

First claim

What is claimed is:

1 . A power supply system to which an assembled battery configured by connecting a plurality of battery cells in series is applied, the power supply system comprising:
a positive electrode-side power supply path connected to a positive electrode-side power supply terminal of the assembled battery; a negative electrode-side power supply path connected to a negative electrode-side power supply terminal of the assembled battery; and a capacitor unit connected to the power supply paths, wherein the capacitor unit is formed of a first capacitor having one end connected to the positive electrode-side power supply path and the other end connected to an inter-cell connection point provided between the battery cells in the assembled battery, or a second capacitor having one end connected to the negative electrode-side power supply path and the other end connected to the inter-cell connection point, or a series connection of a plurality of capacitors having one end connected to the positive electrode-side power supply path and the other end connected to the negative electrode-side power supply path, an inter-capacitor connection point located between the capacitors forming the series connection being electrically connected to the inter-cell connection point, and an electric path between the inter-cell connection point and the capacitor unit is insulated from a ground member.

2 . The power supply system according to claim 1 , wherein the inter-cell connection point is a midpoint along the plurality of battery cells connected in series in the assembled battery.

3 . The power supply system according to claim 1 , wherein a third capacitor is provided in an electric path connecting the capacitor unit and the inter-cell connection point.

4 . The power supply system according to claim 3 , wherein a plurality of the inter-cell connection points are provided, and the capacitor unit is connected to each of the inter-cell connection points via the third capacitor.

5 . The power supply system according to claim 1 , further comprising a high voltage circuit including at least the assembled battery, the positive electrode-side power supply path, and the negative electrode-side power supply path, and a low voltage circuit whose input and output voltages are lower than input and output voltages of the high voltage circuit,
wherein the high voltage circuit is located on a first conductive ground member with a first insulating member interposed therebetween, or is surrounded by a first conductive ground member with a first insulating member interposed therebetween, the low voltage circuit is connected to a second ground member, and the first ground member is insulated from the second ground member by a second insulating member.

6 . The power supply system according to claim 5 , wherein the first ground member is connected to an electric path between the inter-cell connection point and the capacitor unit.

7 . The power supply system according to claim 5 , wherein the first ground member is insulated from the second ground member by the second insulating member, and the power supply system further comprises a first diode unit that allows current to pass from the first ground member to the second ground member, and a second diode unit that allows current to flow from the second ground member to the first ground member.

8 . The power supply system according to claim 5 , wherein the first ground member is insulated from the second ground member by the second insulating member, and the power supply system further comprises a resistance unit connecting the first and second ground members, and
a resistance value of the resistance unit is lower than a maximum value of insulation resistance of the second insulating member.

9 . The power supply system according to claim 1 , wherein each of the power supply paths includes a relay switch for switching between power conduction and interruption of the power supply path.

10 . A power supply system to which an assembled battery configured by a plurality of battery cells connected in series is applied, the power supply system comprising:
power supply paths connected to respective power supply terminals of the assembled battery; and an access-preventing unit covering the assembled battery and the power supply paths to prevent access to the assembled battery and the power supply paths, wherein the assembled battery and the power supply paths are insulated from a ground member serving as a reference potential via an insulating member, and the access-preventing unit is electrically connected via a conductive connector.

11 . The power supply system according to claim 10 , wherein each of the power supply paths includes a relay switch for switching between power conduction and interruption of the power supply path.

Assignees

• Denso Corp

Inventors

• Kitagawa Masaaki
• Kouda Masakazu

Classifications

• H02J7/751

  concerning the insertion or the connection of the batteries · CPC title

• H02J7/96

  in response to battery voltage · CPC title

• H02J7/575 Primary

  Parallel/serial switching of connection of batteries to charge or load circuit · CPC title

• H02J7/1423 Primary

  with multiple batteries · CPC title

• B60L3/00

  Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption (methods or circuit arrangements for monitoring or controlling batteries or fuel cells B60L58/00) · CPC title