JP5786806B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module.

  Secondary batteries such as lithium ion batteries and nickel metal hydride batteries are known as examples of power storage elements in which power storage elements are housed. Secondary batteries, such as a lithium ion battery, comprise a battery module by connecting two or more. Such a battery module is mounted on, for example, an electric vehicle, a hybrid vehicle, or the like (see, for example, Patent Document 1).

JP 2007-227030 A

  In a power storage module such as a battery module, a power storage element constituting the power storage module may become hot due to repeated charging with a large current. When the power storage element is at a high temperature, there is a concern about a decrease in performance. Therefore, in Patent Document 1, a battery module having a cooling structure is proposed.

  The cooling structure of the battery module proposed in Patent Document 1 is configured such that an intake duct that supplies a refrigerant and an exhaust duct that discharges the refrigerant are arranged and attached to opposing side surfaces of the unit cell group. It is structured to cool. In the case of such a cooling structure, for example, there is a problem that a single battery arranged at the center of the single battery group is less likely to be cooled than a single battery arranged at the end.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a power storage module including a cooling structure that efficiently cools a power storage element while having a simple structure.

The present invention is a power storage module including a power storage element group composed of a plurality of power storage elements, each of the plurality of storage sections that respectively hold the plurality of power storage elements, and a ventilation section formed between the adjacent storage sections. In the laminated battery, the power storage element includes a power generation element and a laminate film that encloses the power generation element and has an edge welded thereto. A portion inside the edge portion is a power generation element arrangement portion where the power generation element is arranged, and the holding portion is provided so as to be in surface contact with the power generation element arrangement portion.

Since the electricity storage module of the present invention includes an insulating holding member having a plurality of holding portions for holding the electricity storage elements and a ventilation portion formed between adjacent holding portions, heat generated in each electricity storage element is generated in the ventilation portions. Heat is released and released to the outside. As a result, according to the present invention, it is possible to provide a power storage module including a cooling structure that efficiently cools the power storage element, while having a simple structure. In addition, heat generated from the power storage element is efficiently transmitted to the holding portion, and heat dissipation is improved.

The present invention may have the following configurations.
The insulating holding member may be provided with a gas reservoir for collecting gas discharged from the inside of the laminated battery.

  In a battery, gas may be released from the inside of the battery in the event of an abnormality. However, with the above configuration, gas generated from the inside of the battery at the time of abnormality or the like accumulates in a gas reservoir provided in the insulating holding member. Even if the power storage module is disposed indoors, it is difficult to be adversely affected by the gas released from the battery.

The laminate type battery includes an electrode terminal that is connected to the power generation element and protrudes outward from a welded edge of the laminate film, and the gas reservoir includes the laminate film from which the electrode terminal protrudes. It may be provided corresponding to the edge portion.

  In laminated batteries, the welded part of the laminate film is more likely to come off than the other parts, so the gas generated in the battery during an abnormality can be released from the peeled part of the welded part of the laminated film. Many. Therefore, with the above configuration, the gas released from the inside of the laminate type battery at the time of abnormality or the like efficiently moves to the gas reservoir.

  The holding unit may be provided so as to hold the power storage element in a sandwiched state. With such a configuration, since the power storage element receives a pressing force from the holding portion, a stable output can be ensured.

  ADVANTAGE OF THE INVENTION According to this invention, although it is a simple structure, the electrical storage module provided with the cooling structure which cools an electrical storage element efficiently can be provided.

The perspective view of the battery module of Embodiment 1. Disassembled perspective view of battery module Front view of battery module Sectional drawing in the AA line of FIG. Sectional drawing in the BB line of FIG. The perspective view which looked at the lid part of the insulating holding member from the back side Front view of the battery module with the lid removed Single cell perspective view

<Embodiment 1>
A first embodiment in which a power storage module of the present invention is applied to a battery module 10 will be described with reference to FIGS.
The battery module 10 according to the present embodiment is, for example, a battery module 10 for Integrated Starter Generator (ISG).

  As shown in FIGS. 1 and 2, the battery module 10 includes a unit cell group 11 including six unit cells 12 (an example of a plurality of power storage elements) and a bus bar 19 (connection) that electrically connects the unit cells 12. Member), two connection member wiring boards 16 on which fuses 20 and the like connected to the unit cells 12 are disposed, and an insulating holding member 30 that holds the unit cells 12.

(Connection member wiring board 16)
The two connection member wiring boards 16 are members made of an insulating resin disposed along the edge portion where the electrode terminal 13 of the unit cell 12 is formed. Each connection member wiring board 16 is provided with a terminal insertion hole 18 into which the electrode terminal 13 of the unit cell 12 is inserted, and a bus bar holding unit 17 that holds the bus bar 19 and the like connected to the unit cell 12.

  The terminal insertion hole 18 is provided corresponding to each unit cell 12, and a bus bar holding portion 17 for fitting and holding the bus bar 19 is formed adjacent to the terminal insertion hole 18.

  In the connection member wiring board 16 on the near side shown in FIGS. 1 and 2, the fuse 20 is disposed on the right edge of the figure, and the voltage detection connector 22 is disposed on the left edge of the figure. The voltage detection connector 22 is connected to an ECU (Electronic Control Unit) (not shown), for example. The fuse 20 disposed on the right edge is connected to the unit cell 12 disposed on the top and the positive electrode post 23 projecting to the lower right via the bus bar 19.

  Three voltage detection lines 21 are connected to the voltage detection connector 22. Each of the three voltage detection lines 21 is connected to a bus bar 19, and a fuse 20 (glass tube fuse 20A) and an electrode terminal 13 protruding from the unit cell 12 are connected to the bus bar 19 to which the voltage detection line 21 is connected. It is connected. A bus bar 19 to which the voltage detection line 21 is not connected is disposed at the lower end of the figure, and a negative electrode post 24 is formed on the bus bar 19.

  1 and 2, the connection member wiring board 16 on the back side is not shown in detail, but a bus bar holding for holding the terminal insertion hole 18 for inserting the electrode terminal 13, the bus bar 19 connected to the unit cell 12, and the like. The part 17 is provided, and the connector 22 and the fuse 20 are arranged (see FIGS. 3 and 7).

(Single cell 12)
As shown in FIG. 2, the six unit cells 12 constituting the unit cell group 11 are arranged substantially parallel between the two connection member wiring boards 16 with a large surface 15 on the outer surface being arranged vertically. Is arranged. The adjacent unit cells 12 are arranged so that the electrode terminals 13 having different polarities are arranged at positions facing each other.

  In this embodiment, the unit cells 12 constituting the unit cell group 11 are laminate type cells 12 as shown in FIG. The unit cell 12 includes a power generation element (not shown), a laminate film 14 that encloses the power generation element and has an edge 14A welded thereto, and is connected to the power generation element and protrudes outward from the edge 14A to which the laminate film 14 is welded. Electrode terminal 13 to be used. The electrode terminal 13 protruding from the right edge 14A in FIG. 8 is a positive terminal 13A, and the electrode terminal 13 protruding from the left edge 14A is a negative terminal 13B.

(Insulation holding member 30)
The insulating holding member 30 that holds the six unit cells 12 is made of an insulating resin material. In the present embodiment, the insulating holding member 30 includes a lid portion 31 and a holding member main body 35 as shown in FIG.

  As shown in FIGS. 2 and 6, the lid portion 31 is formed with a ventilation portion 32 corresponding to the ventilation portion 39 of the holding member main body 35. Further, on the back side of the lid portion 31, a frame-shaped protrusion 33 is formed which is fitted to the periphery of the frame body portion 38 surrounding the ventilation portion 39 of the holding member main body 35 and closes the gas reservoir portion 40 (see FIG. 5). In addition, a recess 34 that receives the front end portion of the side wall of the holding member main body 35 is provided outside the frame-shaped protrusion 33.

  As shown in FIG. 2, the holding member main body 35 is provided with six holding portions 36 that hold the unit cells 12 at substantially parallel intervals. As shown in FIG. 4, the height dimension of the holding portion 36 is set slightly larger than the thickness dimension of the unit cell 12, and is shaped in accordance with the external shape of the unit cell 12.

  In addition, since the unit cell 12 swells by charging, for example, an appropriate compression force is applied by being held in the holding portion 36 from above and below. Thereby, the output of the cell 12 is ensured. And in the holding | maintenance part 36, the surface 15 with a large area of the cell 12 can be in surface contact with the holding surface 37 distribute | arranged up and down.

  Between adjacent holding portions 36, a ventilation portion 39 surrounded by a frame body portion 38 is formed. Even in the state where the lid portion 31 is attached, the ventilation portion 39 can ventilate air in the front-rear direction, so that heat generated in the unit cell 12 can be dissipated and released out of the battery module 10. .

  On the left and right sides of the frame body portion 38, spaces 40 are formed in which the edge portions 14A from which the electrode terminals 13 of the individual cells 12 protrude are arranged. In this space 40, gas generated in the unit cell 12 at the time of abnormality leaks and moves from the edge portion 14A due to peeling of the welded portion, and functions as the gas reservoir 40. The gas reservoir portions 40 formed on the left and right sides of the frame body portion 38 become a sealed space by attaching the lid portion 31.

(Assembly method of battery module 10 of this embodiment)
A fuse 20, a glass tube fuse 20A, a connector 22, a bus bar 19 and the like are attached to each connection member wiring board 16. The electrode terminals 13 of each unit cell 12 are inserted into the terminal insertion holes 18 of the two connection member wiring boards 16, respectively, and the unit cell 12 is attached between the connection member wiring boards 16, and the state as shown in FIG. To do.

  The connection member wiring board 16 to which the unit cell 12 is attached is moved rightward as shown in FIG. 2 and arranged on the pair of side surfaces of the holding member main body 35. At this time, each single battery 12 is inserted and inserted into each holding portion 36 of the holding member main body 35. When the connection member wiring board 16 to which the unit cell 12 is attached is disposed on the side surface of the holding member main body 35, the state shown in FIG. Next, when the lid portion 31 is attached to the holding member main body 35, the battery module 10 shown in FIG. 1 is obtained.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.
Since the battery module 10 of the present embodiment includes the insulating holding member 30 having a plurality of holding portions 36 that hold the single cells 12 and a ventilation portion 39 formed between the adjacent holding portions 36, each single cell is provided. The heat generated at 12 is radiated to the ventilation portion 39 and released to the outside. As a result, according to the present embodiment, it is possible to provide the battery module 10 including a cooling structure that efficiently cools the single battery 12 (power storage element) while having a simple structure.

  Further, in the present embodiment, the insulating holding member 30 is provided with the gas reservoir 40 for collecting the gas discharged from the inside of the unit cell 12, so that the gas generated from the inside of the unit cell 12 in the event of an abnormality or the like. Accumulates in the gas reservoir 40 provided in the insulating holding member 30. As a result, according to the present embodiment, even if the battery module 10 is disposed indoors, it is difficult to be adversely affected by the gas released from the unit cell 12.

  In the present embodiment, the cell 12 includes a power generation element, a laminate film 14 that encloses the power generation element and has an edge welded thereto, and an edge 14A that is connected to the power generation element and has the laminate film 14 welded thereto. The gas reservoir 40 is provided corresponding to the edge 14A of the laminate film 14 from which the electrode terminal 13 protrudes.

  In the laminate type battery, the welded portion (edge portion 14A) of the laminate film 14 is easier to come off than the other portions, so that the gas generated in the unit cell 12 at the time of abnormality is the welded portion of the laminate film 14 In many cases, it is discharged from the peeled portion of the (edge portion 14A). Therefore, according to the present embodiment, the gas released from the inside of the laminate type cell 12 at the time of abnormality or the like efficiently moves to the gas reservoir 40.

  In addition, according to the above embodiment, the holding unit 36 is provided so as to be able to hold the unit cell 12 in a sandwiched state. Therefore, the unit cell 12 receives a pressing force from the holding unit 36 and ensures a stable output. Can do.

  Furthermore, according to the present embodiment, the holding portion 36 is provided so as to come into contact with the surface 15 having a large area among the outer surfaces of the unit cell 12, so that heat generated from the unit cell 12 is retained by the holding unit 36. The heat dissipation is improved.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-described embodiment, the insulating holding member 30 provided with the gas reservoir 40 is shown, but the gas reservoir may not be provided.
(2) In the above embodiment, the example in which the power storage element 12 is a battery has been described. However, the present invention is not limited thereto , and the power storage element may be a capacitor or the like.
(3) In the above-described embodiment, a laminated battery is shown as the power storage element 12, but the battery is not limited to this, and may be a battery in which a power generation element is housed in a metal battery case.
(4) In the above embodiment, the insulating holding member 30 including the holding portion 36 configured to be able to hold the unit cell 12 in a sandwiched state and to contact the surface 15 having a large area among the outer surfaces of the unit cell 12. However, the present invention is not limited to this, and it is only necessary to include a holding portion that can hold the battery.
(5) Although the example used for the battery module 10 for ISG was shown in the said embodiment, you may use for the battery module of another use.

10 ... Battery module (storage module)
11 ... Single cell group (electric storage element group)
12 ... Single cell (electric storage element, battery)
DESCRIPTION OF SYMBOLS 13 ... Electrode terminal 13A ... Positive electrode terminal 13B ... Negative electrode terminal 14 ... Laminate film 14A ... Edge 15 ... Wide surface 30 ... Insulation holding member 31 ... Cover part 32 ... Ventilation part 35 ... Holding member main body 36 ... Holding part 37 ... Holding surface 38 ... Frame body part 39 ... Ventilation part 40 ... Space (gas reservoir part)

Claims (4)

A power storage module comprising a power storage element group consisting of a plurality of power storage elements,
An insulating resin-made insulating holding member having a plurality of holding parts that respectively hold the plurality of power storage elements and a ventilation part formed between the adjacent holding parts ;
The power storage element is a laminate type battery having a power generation element and a laminate film that encloses the power generation element and has an edge welded thereto,
In the laminate type battery, a portion inside the edge is a power generation element arrangement portion where the power generation element is arranged,
The electrical storage module in which the said holding | maintenance part is provided in the said electric power generation element arrangement | positioning part so that surface contact is possible . The power storage module according to claim 1, wherein the insulating holding member is provided with a gas reservoir that accumulates gas discharged from the inside of the laminated battery. The laminate type battery has an electrode terminal protruding from the welded edge of the laminated film is connected to the power generating element in an outward direction,
The power storage module according to claim 2, wherein the gas reservoir is provided corresponding to an edge of the laminate film from which the electrode terminal protrudes.   The power storage module according to any one of claims 1 to 3, wherein the holding unit is provided so as to be able to hold the power storage element in a sandwiched state.

Images