JP3224790U - Storage battery and storage battery system - Google Patents

Abstract

A storage battery and a storage battery system capable of further improving cooling efficiency are provided. A storage battery includes a plurality of battery modules, a plate-shaped first heat pipe, and a plate-shaped second heat pipe. The battery module 10 includes a plurality of battery cells 20 arranged in one direction (x-axis direction). The first heat pipe 11 is inserted between the battery cells 20. The plate-shaped second heat pipe 12 is thermally coupled to the first heat pipe 11 and is attached to the outer side surface of the arrangement of the plurality of battery cells 20 (battery module 10). [Selection diagram] FIG.

Description

  The present invention relates to a storage battery and a storage battery system.

  Thermal management of lithium-ion batteries is important not only for battery life but also for battery safety. Therefore, an assembled battery that cools a lithium ion battery by an air cooling method is disclosed (for example, see Patent Document 1).

JP 2018-98074 A

  However, cooling of the lithium ion battery by the air cooling method has a limit in its cooling efficiency.

  An object of the present invention is to provide a storage battery and a storage battery system that can further increase the cooling efficiency.

In order to achieve the above object, the storage battery according to the first aspect of the present invention includes:
A battery module including a plurality of battery cells arranged in one direction;
A plate-shaped first heat pipe inserted between the battery cells;
A plate-shaped second heat pipe thermally coupled to the first heat pipe and disposed on an outer side surface of the battery module;
Is provided.

In this case, a heat radiating unit that emits heat transmitted from the second heat pipe is provided.
It may be that.

A housing that houses the battery module, the first heat pipe, and the second heat pipe;
A positive electrode terminal electrically connected to the positive electrode of the battery cell, protruding from the housing, and connected to an external cable;
A negative electrode terminal electrically connected to the negative electrode of the battery cell, protruding from the housing and connected to an external cable;
With
The positive electrode terminal and the negative electrode terminal are provided with a conductive portion in a concave portion,
It may be that.

A heating film for heating the battery module is provided,
The second heat pipe is attached to the battery module via the heating film,
It may be that.

The storage battery system according to the second aspect of the present invention includes:
Multiple storage batteries,
A controller including an input terminal that connects the positive electrode and the negative electrode of each of the storage batteries in series or in parallel, and an output terminal that outputs a DC voltage input to the input terminal,
Is provided.

  According to the configuration of the present invention, the battery module is composed of a plurality of battery cells arranged in one direction, the first heat pipe is inserted between the battery cells, and the first heat pipe is provided on the outer side surface of the battery module. And a second heat pipe thermally coupled to the second heat pipe. Thus, the first heat pipe is used to discharge heat from between the battery cells where heat is likely to accumulate, and the second heat pipe is used to discharge heat generated from the battery module and the heat discharged from the first heat pipe. Heat can be easily discharged to the outside. In this case, the cooling efficiency can be further improved as compared with the case of cooling by the air cooling method.

FIG. 2 is a perspective view showing the appearance of the storage battery according to the embodiment of the present invention. FIG. 2 is a diagram illustrating a state in which an external housing is removed from a storage battery main body of the storage battery of FIG. 1. FIG. 3 is an exploded view of the storage battery body of FIG. 2. It is a schematic diagram which shows the internal structure of a positive electrode terminal. FIG. 2 is a schematic view illustrating a state in which heat is released from the battery module of FIG. 1. FIG. 2 is a schematic diagram showing a configuration in which storage batteries are directly connected in the storage battery system according to the embodiment of the present invention. FIG. 7 is a schematic diagram showing a configuration in which storage batteries are connected in parallel in the storage battery system of FIG. 6. (A) is a figure which shows another example of a 1st heat pipe, (B) is a figure which shows another example of a 2nd heat pipe.

  Hereinafter, a storage battery and a storage battery system according to an embodiment of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent parts are denoted by the same reference numerals. In the present embodiment, the description will be made with the horizontal plane as the xy plane and the vertical direction as the z-axis direction.

(Storage battery)
As shown in FIG. 1, the storage battery 1 has an external housing 2 as a rectangular parallelepiped housing. A positive terminal 3 and a negative terminal 4 protrude outside the external housing 2. The positive terminal 3 and the negative terminal 4 are connected to an external cable (not shown), and the storage battery 1 is charged and discharged via the external cable.

  The external housing 2 is provided with a monitoring connector 6 and a temperature control connector 7. The monitoring connector 6 is a connector for outputting voltage information output from the battery module 10 and temperature information of the battery cell 20 to the outside. The temperature control connector 7 is a connector for controlling the temperature of the battery cell 20 heated by the heating film 14.

  Further, the external housing 2 is provided with four connecting portions 8. A connecting piece 9 can be attached to the connecting portion 8. These functions will be described later.

  As shown in FIG. 2, the external housing 2 includes an external housing (upper) 2a and an external housing (lower) 2b. The outer housing 2 is configured by combining an outer housing (upper) 2a and an outer housing (lower) 2b, and accommodates the storage battery main body 5 therein.

  A positive electrode 5a and a negative electrode 5b are provided on the upper part of the storage battery body 5. The storage battery body 5 stores and discharges electricity through the positive electrode 5a and the negative electrode 5b. A positive electrode piece 5c is attached to the positive electrode 5a, and a negative electrode piece 5d is attached to the negative electrode 5b. Positive electrode terminal 3 is electrically connected to positive electrode 5a via positive electrode piece 5c, and negative electrode terminal 4 is electrically connected to negative electrode 5b via negative electrode piece 5d.

  As shown in FIG. 3, the storage battery main body 5 includes a battery module 10, a first heat pipe 11, and a second heat pipe 12. The battery module 10 includes a plurality of battery cells 20. The plurality of battery cells 20 are arranged in one direction. The battery cells 20 are arranged at intervals by the thickness of the first heat pipe 11.

  The battery cell 20 is a lithium ion battery. The battery cells 20 are connected in series to the positive electrode 5a and the negative electrode 5b, respectively. Therefore, in storage battery 1, a voltage that is the sum of the output voltages of battery cells 20 is output.

  The first heat pipe 11 is a plate-like heat pipe. The first heat pipe 11 is inserted into a gap between the battery cells 20.

  The second heat pipe 12 is a plate-like heat pipe. The second heat pipe 12 is attached to a plurality of battery cells 20, that is, the outer side surface of the battery module 10. Second heat pipe 12 is thermally coupled to first heat pipe 11.

  The first heat pipe 11 and the second heat pipe 12 are made of a metal having high thermal conductivity, for example, aluminum. A plurality of spaces are provided inside the first heat pipe 11 and the second heat pipe 12, and the space is filled with a refrigerant. When heat is applied to the first heat pipe 11 and the second heat pipe, the transferred refrigerant changes from a liquid state to a gas state and moves in the space to a relatively low temperature region. The refrigerant that has moved to the low-temperature region is deprived of heat by the surroundings and changes from a gas to a liquid. The first heat pipe 11 and the second heat pipe 12 conduct the transferred heat to the low-temperature portion by the movement of the refrigerant.

  The storage battery 1 further includes an insulating plate 13. The insulating plate 13 electrically insulates between the battery cell 20 and the side plate 16.

  The storage battery 1 includes a heating film 14 that radiates heat transmitted from the second heat pipe 12 to the outside. When the environmental temperature in which the battery cell 20 is used is low, there is a possibility that sufficient discharge cannot be performed. The heating film 14 applies heat to the battery cells 20 when the temperature is low to prevent such a situation.

  The storage battery 1 includes a protective cover plate 15, a side plate 16, and an end plate 17. The protective cover plate 15 is placed on the upper part of the battery module 10. The protection lid plate 15 is provided therein with an electric circuit for heating the heating film 14 and an electric circuit for connecting the battery cells 20 in series. Further, the protective cover plate 15 is provided with the positive electrode 5a and the negative electrode 5b of the battery module 10.

  The side plate 16 is provided via the heating film 14 and the second heat pipe 12 along the arrangement direction (x-axis direction) of the battery cells 20. In FIG. 3, the side plate 16, the heating film 14 and the second heat pipe 12 are shown on only one side, but in fact, the side plate 16, the heating film 14 and the second heat pipe 12 are also on the opposite side. Is provided.

  The end plates 17 are provided at both ends of the battery cells 20 in the arrangement direction. The end plate 17 and the side plate 16 are connected to form a housing of the storage battery main body 5. The side plate 16 and the end plate 17 function as a heat radiating unit that radiates heat transmitted from the second heat pipe 12.

  As shown in FIG. 4, the positive electrode terminal 3 and the negative electrode terminal 4 have their electrodes, that is, the conductive portions 3b are provided in the concave portions 3a. Has been prevented.

  Next, the heat radiation operation of the storage battery 1 will be described. This heat radiation operation is mainly performed by the first heat pipe 11 and the second heat pipe 12.

  As shown in FIG. 5, heat is generated in the battery cell 20 due to storage and discharge. The heat generated in the battery cells 20 is transmitted to the first heat pipe 11. In the first heat pipe 11, heat is transferred toward the outside of the second heat pipe 12 by the movement of the refrigerant. The second heat pipe 12 emits heat transferred from the first heat pipe 11 and the battery cells 20 to the outside.

  Thus, in the storage battery 1 according to the present embodiment, the heat radiation efficiency of the battery cells 20 can be increased. Thereby, the life of the storage battery 1 can be extended, and the safety can be improved. Further, it is possible to increase the number of the battery cells 20 and handle a high voltage.

(Storage battery system)
Furthermore, as shown in FIG. 6, the storage battery system 50 can be configured by including a plurality of storage batteries 1. In the storage battery system 50, the connection portions 8 of the storage battery 1 are connected to each other via the connection piece 9. In the storage battery system 50, the positive terminal 3 and the negative terminal 4 of each of the storage batteries 1 (A to D) are connected in series.

  This storage battery system 50 further includes a BMS (Battery Management System) controller 30. The BMS controller 30 has a positive terminal 3 and a negative terminal 4 of each storage battery 1 (A to D) connected in series to an input terminal (DC input), and inputs a DC voltage output from the storage battery 1. Further, the BMS controller 30 outputs the input DC voltage from an output terminal (DC).

  When the BMS controller 30 is of a type that inputs a DC voltage in parallel, the storage batteries 1 (A to D) may be connected in parallel. For example, as shown in FIG. 7, the storage batteries 1 (A, C) and the storage batteries 1 (B, D) can be connected to the BMS controller 30 in parallel.

  As described above, if a plurality of storage batteries 1 are used, large-voltage storage and discharge can be performed. Thus, for example, by connecting the storage battery system 50 to a solar battery, power is stored from the solar battery to the storage battery system 50 during the day, and power is supplied from the storage battery system 50 to the power load during the night. be able to.

  The number of storage batteries 1 is not limited to four. The number may be two or three, or five or more.

  As described above in detail, according to the present embodiment, the battery module 10 includes the plurality of battery cells 20 arranged in one direction (x-axis direction). One heat pipe 11 is inserted, and a second heat pipe 12 thermally coupled to the first heat pipe 11 is provided on the outer side surface of the battery module 10. Thus, the first heat pipe 11 is used to discharge heat from between the battery cells 20 where heat is likely to accumulate, and the second heat pipe 12 is used to release heat generated from the battery module 10 and the first heat The heat discharged from the pipe 11 can be easily discharged to the outside. In this case, the cooling efficiency can be further improved as compared with the case of cooling by the air cooling method.

  Further, as shown in FIG. 8A, as the first heat pipe 11, two or more heat pipes arranged in the z-axis direction may be used. Alternatively, as shown in FIG. 8B, two or more second heat pipes 12 arranged in the z-axis direction may be used.

  When the storage battery 1 is not used in a cold region, the heating film 14 may not be provided.

  In the storage battery 1 according to the present embodiment, the battery module 10 includes eight battery cells 20. However, the present invention is not limited to this. For example, the number of battery cells 20 may be seven or less, or nine or more.

  In the storage battery 1 according to the present embodiment, a radiator fin or a radiator fan may be further provided as a radiator for radiating heat transmitted from the second heat pipe 12 to the outside.

  The present invention allows various embodiments and modifications without departing from the broad spirit and scope of the present invention. Further, the above-described embodiment is for explaining the present invention, and does not limit the scope of the present invention. That is, the scope of the invention is indicated not by the embodiment but by the claims of the utility model registration. Various modifications made within the scope of the utility model registration claim and within the scope of the equivalent invention are considered to be within the scope of the invention.

  DESCRIPTION OF SYMBOLS 1 Storage battery, 2 outer housing, 2a outer housing (upper), 2b outer housing (lower), 3 positive electrode terminal, 3a recess, 3b conductive portion, 4 negative electrode terminal, 5 storage battery main body, 5a positive electrode, 5b negative electrode, 5c Positive electrode piece, 5d negative electrode piece, 6 monitoring connector, 7 temperature control connector, 8 connecting portion, 9 connecting piece, 10 battery module, 11 first heat pipe, 12 second heat pipe, 13 insulating plate, 14 heating Membrane, 15 protective cover plate, 16 side plate, 17 end plate, 20 battery cells, 30 BMS controller, 50 storage battery system

The storage battery system according to the second aspect of the present invention includes:
A plurality of storage batteries according to a first aspect of the present invention ;
A controller including an input terminal that connects the positive electrode and the negative electrode of each of the storage batteries in series or in parallel, and an output terminal that outputs a DC voltage input to the input terminal,
Is provided.

Claims (5)

A battery module including a plurality of battery cells arranged in one direction;
A plate-shaped first heat pipe inserted between the battery cells,
A plate-shaped second heat pipe thermally coupled to the first heat pipe and disposed on an outer side surface of the battery module;
Storage battery comprising: A heat radiating unit that emits heat transmitted from the second heat pipe;
The storage battery according to claim 1. A housing that houses the battery module, the first heat pipe, and the second heat pipe;
A positive electrode terminal electrically connected to the positive electrode of the battery cell, protruding from the housing, and connected to an external cable;
A negative electrode terminal electrically connected to the negative electrode of the battery cell, protruding from the housing and connected to an external cable;
With
The positive electrode terminal and the negative electrode terminal are provided with a conductive portion in a concave portion,
The storage battery according to claim 1. A heating film for heating the battery module is provided,
The second heat pipe is attached to the battery module via the heating film,
The storage battery according to any one of claims 1 to 3. Multiple storage batteries,
A controller including an input terminal that connects the positive electrode and the negative electrode of each of the storage batteries in series or in parallel, and an output terminal that outputs a DC voltage input to the input terminal,
A storage battery system comprising: