# US 11,309,607 B2 · Battery pack

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- Number: US 11,309,607 B2
- Document ID: US11309607B2
- Status: Granted
- Kind: B2
- Application number: 16/889,974
- Filed: 2020-06-02
- Published: 2020-12-10
- Granted: 2022-04-19
- Earliest claimed: 2019-06-04
- Assignees: Honda Motor Co., Ltd.
- Applicants: Honda Motor Co., Ltd.
- Inventors: Takuya Nishinuma; Hiroto Kobayashi; Akinori Shimomai; Keiichi Ito
- Web page: https://patentgrep.com/patent/US11309607B2

## CPC

- H01M 10/613: Cooling or keeping cold
- H01M 50/507: comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
- H01M 10/625: Vehicles
- H01M 10/643: Cylindrical cells
- H01M 10/6554: Rods or plates
- 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 50/264: for cells or batteries, e.g. straps, tie rods or peripheral frames
- H01M 50/271: Lids or covers for the racks or secondary casings
- H01M 50/284: with incorporated circuit boards, e.g. printed circuit boards [PCB]
- H01M 50/296: characterised by terminals of battery packs (terminals of batteries H01M50/543)
- H01M 50/505: comprising a single busbar
- H01M 50/509: characterised by the type of connection, e.g. mixed connections
- H01M 50/528: Fixed electrical connections, i.e. not intended for disconnection
- H01M 50/588: outside the batteries, e.g. incorrect connections of terminals or busbars
- H01M 50/213: adapted for cells having curved cross-section, e.g. round or elliptic (H01M50/209, H01M50/216 take precedence)
- H01M 50/224: Metals
- H01M 50/503: characterised by the shape of the interconnectors
- H01M 50/51: Connection only in series
- H01M 2220/20: Batteries in motive systems, e.g. vehicle, ship, plane
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

A battery pack includes a first core pack and a second core pack each holding a plurality of unit cells. The unit cells of a first cell group or second cell group that is closest to a connector are electrically connected to the connector through a third busbar. The unit cells of the first cell group or second cell group that is most distant from the connector are electrically connected to the connector through a fourth busbar.

## Claims

### Claim 1

A battery pack including: a case accommodating a plurality of unit cells each having a first electrode and a second electrode; and a connector provided at a bottom of the case,
wherein a lengthwise direction of the battery pack is a top-bottom direction,
the battery pack comprising:
a first core pack and a second core pack each including a cell holder configured to hold a plurality of the unit cells, the first core pack and the second core pack being accommodated in the case so as to face each other,
wherein, the first core pack includes a first end surface and a second end surface that is a back surface with respect to the first end surface,
the second core pack includes a third end surface that faces the second end surface, and a fourth end surface that is a back surface with respect to the third end surface,
in the first core pack and the second core pack, first cell groups are constituted by a plurality of the unit cells that are positioned in such a manner that the first electrodes thereof are directed in a same direction, and second cell groups are constituted by a plurality of the unit cells that are positioned in such a manner that the first electrodes thereof are directed in a direction opposite to the direction in which the first electrodes of the unit cells of the first cell groups are directed, the first cell groups and the second cell groups being arranged alternately in the top-bottom direction;
the unit cells of the first cell groups and the unit cells of the second cell groups are oriented along a widthwise direction that is orthogonal to the lengthwise direction;
a plurality of first busbars each configured to electrically connect the unit cells of one of the first cell groups and the unit cells of one of the second cell groups within the same core pack, on the first end surface and the second end surface of the first core pack or on the third end surface and the fourth end surface of the second core pack;
one second busbar configured to electrically connect the electrode on the second end surface of the lowermost or uppermost unit cell of one of the first cell groups or the second cell groups in the first core pack and the electrode on the third end surface of the lowermost or uppermost unit cell of one of the first cell groups or the second cell groups in the second core pack;
one third busbar configured to electrically connect the connector and the lowermost unit cell of one of the first cell groups or the second cell groups in the first core pack or the second core pack, the lowermost unit cell being closest to the connector; and
one fourth busbar configured to electrically connect the connector and the uppermost unit cell of one of the first cell groups or the second cell groups in the first core pack or the second core pack, the uppermost unit cell being most distant from the connector,
wherein
the first busbars on the second end surface and the first busbars on the third end surface face each other,
a lowest potential busbar with the lowest potential of the first busbars is located lowermost on the second end surface of the first core pack or the third end surface of the second core pack in the case,
a highest potential busbar with the highest potential of the first busbars is located uppermost on the second end surface of the first core pack or the third end surface of the second core pack in the case,
the second busbar electrically connects the uppermost unit cell of the first core pack and the lowermost unit cell of the second core pack, and
the third busbar is provided on one of the first end surface and the fourth end surface, and the fourth busbar is provided on the other of the first end surface and the fourth end surface in a manner so as to overlap either the first core pack or the second core pack when viewed from a direction perpendicular to an axial direction of the plurality of unit cells.

### Claim 2 (depends on 1)

The battery pack according to claim 1, wherein the second busbar is provided in singularity, and the single second busbar electrically connects the unit cells of one of the first cell groups or the second cell groups that is closest to the connector in the first core pack, and the unit cells of one of the first cell groups or the second cell groups that is most distant from the connector in the second core pack.

### Claim 3 (depends on 1)

The battery pack according to claim 1, wherein the second busbar is provided in plurality, and each of the second busbars electrically connects the unit cells of one of the first cell groups or the second cell groups in the first core pack, and the unit cells of one of the first cell groups or the second cell groups in the second core pack, the cell group in the first core pack and the cell group in the second core pack facing each other.

### Claim 4 (depends on 3)

The battery pack according to claim 3, wherein each of the second busbars includes a first parallel member electrically connected to the unit cells of one of the first cell groups in the first core pack or to the unit cells of one of the second cell groups in the first core pack, a second parallel member electrically connected to the unit cells of one of the second cell groups in the second core pack or to the unit cells of one of the first cell groups in the second core pack, and a series member configured to electrically connect the first parallel member and the second parallel member.