Power storage module, power storage system, electronic apparatus, electric vehicle, and power system

• US 10,446,890 B2
• Filed: 12/11/2015
• Issued: 10/15/2019
• Est. Priority Date: 01/16/2015
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Yoshida, Naotake, Aoyama, Tsutomu, Adachi, Tatsuya, Ono, Hiroaki, Yoshizawa, Noritsugu
• Primary Examiner(s): Memula, Suresh
• Application Number:
  US15/540,388
• Publication Number:
  US 20170352931A1
• Time in Patent Office: 1,404 Days
• Field of Search: 320134
• CPC Class Codes: H01M 10/613 Cooling or keeping cold
• CPC Class Codes: H01M 10/617 for achieving uniformity or desired distribution of temperature
• CPC Class Codes: H01M 10/625 Vehicles
• CPC Class Codes: H01M 10/627 Stationary installations, e.g. power plant buffering or backup power supplies
• CPC Class Codes: H01M 10/637 characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching means for preventing undesired use or discharge H01M50/572
• CPC Class Codes: H01M 10/643 Cylindrical cells
• CPC Class Codes: H01M 10/652 characterised by gradients for achieving a desired temperature gradient H01M10/617
• CPC Class Codes: H01M 10/653 characterised by electrically insulating or thermally conductive materials
• CPC Class Codes: H01M 10/6553 Terminals or leads
• CPC Class Codes: H01M 10/6554 Rods or plates
• CPC Class Codes: H01M 10/6556 Solid parts with flow channel passages or pipes for heat exchange closed pipes H01M10/6552
• CPC Class Codes: H01M 10/6562 with free flow by convection only
• CPC Class Codes: H01M 50/213 adapted for cells having curved cross-section, e.g. round or elliptic H01M50/209, H01M50/216 take precedence
• CPC Class Codes: H01M 50/291 characterised by their shape
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A power storage module includes: a battery block group including a plurality of battery cells; a connecting terminal portion joined to terminal surfaces of the plurality of battery cells; and a heat conductive material arranged in a manner contacting the connecting terminal portion. The heat conductive material includes at least any member of a plurality of interspersed members or a member having a clearance. The heat conductive materials are distributed more densely in a center portion of a region surrounded by an outermost peripheral edge of the battery block group than in peripheral portions surrounding the center portion in a plan view from a normal line direction of an arrangement surface of the heat conductive materials.

Claims

1. A power storage module, comprising:

a battery block group including a plurality of battery cells;

a connecting terminal portion joined to terminal surfaces of the plurality of battery cells; and

a heat conductive material arranged on the connecting terminal portion in a contacting manner, wherein

the heat conductive material includes at least any member of a plurality of interspersed members or a member having a clearance, and

the heat conductive material is distributed more densely in a center portion of a region surrounded by an outermost peripheral edge of the battery block group than in peripheral portions surrounding the center portion in a plan view from a normal line direction of an arrangement surface of the heat conductive material.

2. The power storage module according to claim 1, wherein the heat conductive material is distributed more densely in a part of peripheral portions near a heat generating member than in peripheral portions excluding the part of the peripheral portions in the plan view from the normal line direction of the arrangement surface of the heat conductive material.

3. The power storage module according to claim 1, wherein an area of a flat surface shape of a member of a plurality of interspersed members is smaller than an area of an end surface of a battery cell of the plurality of battery cells.

4. The power storage module according to claim 3, wherein one piece of the member is arranged in a position corresponding to one end surface of the battery cell.

5. The power storage module according to claim 4, wherein the member is arranged in a position corresponding to substantially a center of the one end surface of the battery cell.

6. The power storage module according to claim 1, wherein the heat conductive material is more densely arranged on a center portion side than on an outer peripheral side at least on any one of a front end side of the peripheral portions, a rear end side of the peripheral portions, and a center side of the peripheral portions located between the front end side and the rear end side of the peripheral portions in the plan view from the normal line direction of the arrangement surface of the heat conductive materials.

7. The power storage module according to claim 1, wherein the heat conductive material has a sheet-like shape.

8. The power storage module according to claim 1, wherein a member of the plurality of interspersed members has a shape same as or a shape similar to a flat surface shape of a terminal surface of a battery cell of the plurality of battery cells.

9. The power storage module according to claim 1, including a stacked body in which battery units each including a battery case housing the battery block group, the connecting terminal portion, and the heat conductive material are stacked in two or more stages,

wherein the heat conductive material is arranged on one surface side and another surface side facing the one surface side of the stacked body.

10. The power storage module according to claim 9, wherein distribution of the heat conductive material arranged on the one surface side differs from distribution of the heat conductive material on the other surface side.

11. The power storage module according to claim 9, wherein

the battery case has a structural body fitted into a space equivalent to substantially a size of one battery cell, and

at least part of the structural body is located in the center portion in the plan view from the normal line direction of the arrangement surface of the heat conductive material.

12. The power storage module according to claim 1, wherein the battery block group has a structure in which a plurality of battery rows including the plurality of battery cells arranged in rows is arranged side by side in a direction substantially orthogonal to a row direction.

13. The power storage module according to claim 12, wherein the connecting terminal portion is joined to the terminal surfaces of the plurality of battery cells constituting at least one of the plurality of battery rows, and has a longitudinal direction arranged in parallel to the row direction of the battery row.

14. A power system, comprising:

a battery block group including a plurality of battery cells;

a connecting terminal portion joined to terminal surfaces of the plurality of battery cells;

a heat conductive material arranged on the connecting terminal portion in a contacting manner, wherein

the heat conductive material includes at least any member of a plurality of interspersed members or a member having a clearance, and

the heat conductive material is distributed more densely in a center portion of a region surrounded by an outermost peripheral edge of the battery block group than in peripheral portions surrounding the center portion in a plan view from a normal line direction of an arrangement surface of the heat conductive material; and

a power information transmitting/receiving unit configured to;

perform transmission and receipt of signals with other apparatuses via a network, and

charging/discharging control for the power storage module, on the basis of information received by the transmitting/receiving unit.

15. A power system, comprising:

circuitry configured to receive power supply from a power storage module or supply power to the power storage module from a power generator or a power network, wherein the power storage module comprises;

a battery block group including a plurality of battery cells;

a connecting terminal portion joined to terminal surfaces of the plurality of battery cells;

a heat conductive material arranged on the connecting terminal portion in a contacting manner, wherein

the heat conductive material includes at least any member of a plurality of interspersed members or a member having a clearance, and

the heat conductive material is distributed more densely in a center portion of a region surrounded by an outermost peripheral edge of the battery block group than in peripheral portions surrounding the center portion in a plan view from a normal line direction of an arrangement surface of the heat conductive material.