JP6295527B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module including a plurality of cylindrical power storage cells and a pipe network including a plurality of heat exchange pipes for exchanging heat between the cylindrical power storage cells.

  In order to obtain a desired voltage and capacity, a power storage module mounted on vehicles such as automobiles, carts, and trucks and various devices are connected in series or in parallel and held using a holder member. Is configured. Therefore, conventionally, in the case of using a cylindrical storage cell having a large calorific value, in order to cool the heat generated by each storage cell, JP 2005-534143 A (Patent Document 1) or JP 2005-285455 A As shown in Japanese Patent Publication (Patent Document 2), the heat generated by the storage cell is cooled by passing a refrigerant through a passage provided in the holder member.

JP 2005-534143 A JP 2005-285455 A

  However, since the storage module has a size limit due to problems such as installation space, it is necessary to achieve both high output and space saving. If the configuration is such that the cylindrical storage cell is held using a holder as in the conventional case, the holder member is sandwiched between the cylindrical storage cell and the cylindrical storage cell. There was a limit to making it compact by arranging it. Moreover, when using a holder member, it cannot respond to numbers other than the predetermined number of electrical storage cells.

  The objective of this invention is providing the electrical storage module which can be reduced in size, fully performs heat exchange, and can be used in a suitable temperature environment.

  Another object of the present invention is to provide a power storage module that can flexibly cope with a change in the number of power storage cells.

  Still another object of the present invention is to provide a power storage module that can use general-purpose components used in conventional power storage modules while solving the above-described problems.

  In the present invention, two or more cell rows in which a plurality of cylindrical energy storage cells are arranged in one direction orthogonal to the longitudinal direction of each cylindrical energy storage cell are aligned in the longitudinal direction and the direction orthogonal to one direction. Heat exchange between the storage cell group configured by the above and the one or more cylindrical storage cells through which the heat medium flows and extends in the longitudinal direction along the one or more cylindrical storage cells. A power storage module having a pipe network including a plurality of heat exchange pipes to be performed is a target. In the present invention, among the plurality of heat exchange pipes included in the pipe network, the heat exchange pipe disposed at a position surrounded by three or more cylindrical power storage cells is the outer surface of the three or more cylindrical power storage cells. And three or more outer surfaces that are curved and extend in the longitudinal direction. By comprising in this way, it becomes possible to arrange | position cylinder-type electrical storage cells, without interposing a holder member, Therefore An electrical storage module can be compactized. In addition, among the plurality of heat exchange pipes included in the pipe network, three or more outer surfaces of the heat exchange pipes arranged at positions surrounded by three or more cylindrical battery cells are connected to the cylindrical battery cell. Since it curves along the outer surface and extends in the longitudinal direction, the contact area between the cylindrical storage cell and the heat exchange pipe is increased. Therefore, heat exchange can be performed efficiently between the plurality of cylindrical energy storage cells located in the internal region of the energy storage cell group and the heat exchange pipe, and the energy storage module can be used in an appropriate temperature environment. it can.

  The arrangement configuration of a plurality of cylindrical energy storage cells included in two adjacent cell rows is such that one cylindrical energy storage cell included in one cell row is included in the other cell row and adjacent two cylinders If the storage cell group is configured to have a configuration (so-called “stacking” configuration) arranged so as to face the space formed between the type storage cells, it is included in each of the two adjacent cell rows. The storage module can be made compact by making the interval between two adjacent cylindrical storage cells the shortest. In this configuration, among the plurality of heat exchange pipes included in the pipe network, the heat exchange pipes disposed at positions surrounded by one cylindrical energy storage cell and two cylindrical energy storage cells are each 1 It can be configured to have three outer surfaces that are curved and extend in the longitudinal direction along the outer surface of the two cylindrical energy storage cells and the outer surface of the two cylindrical energy storage cells. If comprised in this way, it is the state where the space | interval between two adjacent cylindrical energy storage cells contained in each of adjacent two cell rows is the shortest, and the interior of the energy storage cell group is reduced while making the energy storage module compact. Increase the contact area between the plurality of cylindrical energy storage cells located in the area and the heat exchange pipe, and efficiently between the plurality of cylindrical energy storage cells located in the inner area of the energy storage cell group and the heat exchange pipe. Heat exchange can be performed.

  In addition, if a portion of the plurality of heat medium pipes that are not in contact with the cylindrical storage cell is configured to have a cylindrical shape, a plurality of joints using a general-purpose joint having a cylindrical shape are used. The heat medium pipes can be connected to each other.

  In the outermost periphery of the storage cell group, there is a space that is not surrounded by the cylindrical storage cell. In order to enhance the effect of heat exchange, it is preferable to provide a plurality of heat exchange pipes in contact with one or more cylindrical power storage cells located on the outermost peripheral part of the power storage cell group in the pipe network. Of course, these heat exchange pipes may also have an outer surface that is curved and extends in the longitudinal direction along the outer surface of the cylindrical storage cell.

  The configuration of the piping network is arbitrary. For example, the piping network may be configured to include one or more parallel piping groups including a plurality of heat exchange piping connected in parallel to the heat medium source.

  The heat exchange pipe is preferably made of a material that is deformed and curved along the cylindrical storage cell, such as a rubber material or a resin material. If a heat exchanging pipe made of a rubber material or a resin material is used, the heat exchanging pipe also serves as a buffer material having insulation properties. Therefore, it is possible to prevent direct contact between adjacent cylindrical storage cells in the storage cell group. Further, it is possible to suppress the occurrence of variations in the distance between adjacent cylindrical energy storage cells, and to suppress the unstable shape of the energy storage cell group.

  Note that the power storage cell may not be able to exhibit sufficient performance not only in a high temperature environment but also in a low temperature environment, and thus heating may be necessary when the power storage module is used in a low temperature environment. In that case, it is also possible to heat the storage cell by heat exchange with a heat medium passed through the heat exchange pipe. The appropriate temperature of the storage cell is about 55 ° C. ± 10 ° C. Therefore, if the heat medium passed through the heat exchange pipe is adjusted in the temperature range of 30 ° C. to 70 ° C. according to the environmental temperature, the storage cell It becomes possible to manage temperature appropriately.

It is the schematic block diagram seen from the right side which shows the combination of the electrical storage module of this Embodiment, and a heat exchanger. It is the front view which abbreviate | omitted some piping of the electrical storage module of this Embodiment. It is the rear view which abbreviate | omitted some piping of the electrical storage module of this Embodiment. It is a top view of piping of the electrical storage module of this Embodiment. (A) is a diagram schematically showing a part of piping of the piping network with the cylindrical storage cell omitted, and (B) is a drawing of piping of the piping network shown in (A) to the storage module. It is a front view of the electrical storage module which showed the example of a connection of piping for heat exchange in the case of applying. (A) is the figure of 2nd Embodiment which abbreviate | omitted the cylindrical electrical storage cell and showed typically a part of piping of piping network, (B) is the piping shown to (A). It is the front view of the electrical storage module which showed the connection example of the piping for heat exchange in the case of applying the piping of a network to an electrical storage module.

  Hereinafter, an example of an embodiment of a power storage module of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic configuration diagram viewed from the right side showing a combination of the power storage module 1 and the heat exchanger 3 according to the present embodiment. The power storage module 1 is combined with the heat exchanger 3 via the manifold 4. The heat exchanger 3 is a general heat exchanger using water or the like as a heat medium. The heat exchanger 3 is connected to the manifold 4 by a heat exchanger connection pipe 2. In FIG. 1, piping extending from the manifold 4 is conceptually shown only by dotted lines, and specific piping will be described later. FIG. 2 is a front view in which a part of the piping of the power storage module of the present embodiment is omitted, FIG. 3 is a rear view thereof, and FIG. 4 is a plan view. In FIG. 1 to FIG. 4, there are cases where only a part of a plurality of members and the like are provided with reference numerals.

[Configuration of power storage module]
The power storage module 1 mainly includes a power storage cell group 5 and a piping network 7. The front surface of the power storage module 1 is a surface that is connected to a load, and the back surface is a surface that faces the manifold 4.

[Storage cell group]
The storage cell group 5 is composed of three cell rows (10A, 10B, 10C) in which 16 cylindrical storage cells 9 that are lithium ion capacitors are arranged side by side in one direction orthogonal to the longitudinal direction of each cylindrical storage cell. ) Are arranged side by side in the longitudinal direction and the direction orthogonal to one direction. The sixteen cylindrical energy storage cells 9 are connected to each other so as to be connected in series by electrically connecting adjacent positive electrode terminals 9A and negative electrode terminals 9B using a plurality of bus bars 11.

  Each cylindrical storage cell 9 is configured such that one end is a positive electrode terminal 9A and the other end is a negative electrode terminal 9B, and the periphery is covered with an insulating tube 9C. As shown in FIGS. 2 and 3, the 16 cylindrical energy storage cells 9 are sequentially designated as 9a, 9b... 9o, 9p, and this symbol is used when individually pointing to the cylindrical energy storage cells 9. Shall.

  A plurality of cylindrical energy storage cells 9 constitute cell rows 10A, 10B, and 10C. In each cell row, positive and negative terminals are alternately arranged. The cell row 10A includes five cylindrical power storage cells 9a to 9e. Specifically, the negative electrode terminal of the cylindrical energy storage cell 9a and the positive electrode terminal of the cylindrical energy storage cell 9b are connected on the back using the bus bar 11, and the negative electrode terminal of the cylindrical energy storage cell 9b and the positive electrode terminal of the cylindrical energy storage cell 9c are connected. Are connected in front using the bus bar 11 and similarly connected up to the cylindrical storage cell 9e, thereby forming a cell row 10A. The bus bar 11 is fixed to the positive electrode terminal 9A or the negative electrode terminal 9B by resistance welding, whereby the cylindrical storage cells 9 are also fixed to each other. The cell row 10B is composed of six cylindrical cells 10C, and the cell row 10C is composed of five cylindrical energy storage cells 9, which are connected and fixed using the bus bar 11 similarly to the cell row 10A. 2 and 3, the bus bar 11 is drawn as a transparent member for easy understanding. The same applies to FIGS. 5B and 6B described later. Moreover, in FIG.1 and FIG.4, in order to understand easily, illustration of the bus bar 11 is abbreviate | omitted.

  In the present embodiment, the cylindrical storage cells 9A and 10B and the cylindrical storage cells 9 included in the cell rows 10B and 10C are arranged so that the cylindrical storage cells are placed close to each other without using a holder member. The configuration is such that one cylindrical energy storage cell 9 included in one cell row faces a space formed between two adjacent cylindrical energy storage cells 9 and 9 included in the other cell row. It is piled up so that it may become the composition (so-called "pile stacking" composition) arranged in this way. After stacking the cell rows 10A, 10B, and 10C in this way, the negative electrode terminal of the cylindrical storage cell 9e in the cell row 10A and the positive electrode terminal of the cylindrical storage cell 9f in the cell row 10B are connected on the back using the bus bar 11. By connecting the negative terminal of the cylindrical storage cell 9k in the cell row 10B and the positive terminal of the cylindrical storage cell 9l in the cell row 10C on the back using the bus bar 11, the 16 cylindrical storage cells 9 are electrically connected. Are connected in series, and the cell rows are fixed to each other.

  As shown in FIG. 2, the cylindrical storage cell 9a is provided with a positive output terminal 13, the cylindrical storage cell 9p is provided with a negative output terminal 15, and is configured to be connected to a load (not shown). (The positive output terminal 13 and the negative output terminal 15 are shown only in FIG. 2). As will be described later, after the heat exchange pipe 19 is arranged, the periphery of the power storage module 1 is tightened with two belt-like tapes 17, thereby fixing the 16 cylindrical power storage cells 9. Has been.

[Piping network]
As conceptually shown in FIG. 1, the piping network 7 has a heat exchange in which a heat medium flows therein and extends in the longitudinal direction along the cylindrical storage cell 9 to exchange heat with the cylindrical storage cell 9. It comprises a manifold pipe 19, a manifold connection pipe 21 that connects the heat exchange pipe 19 to the manifold 4, and a joint pipe 23.

  The heat exchanging pipe 19 is formed of a rubber material, and the internal heat exchanging pipe 19A disposed in the space surrounded by the cylindrical storage cell 9 and the outer peripheral part heat exchanging disposed in the outer peripheral part. There are two types of pipes 19B (hereinafter referred to simply as "heat exchange pipe 19" when the internal heat exchange pipe 19A and the outer peripheral heat exchange pipe 19B are not distinguished).

  The internal heat exchanging pipe 19A is arranged at a position 25 surrounded by one cylindrical energy storage cell 9 and two cylindrical energy storage cells 9, 9. In the present embodiment, the same position 25 has 18 positions. There are a total of 18 internal heat exchange pipes 19A, one for each. Each of the internal heat exchange pipes 19A has a substantially triangular shape having three outer surfaces that are curved and extend in the longitudinal direction along the outer surface of one cylindrical energy storage cell and the outer surfaces of the two cylindrical energy storage cells. ing. However, the internal heat exchanging pipe 19A is configured to have a cylindrical shape in a portion not in contact with the cylindrical storage cell 9 (in FIG. 2 and FIG. 3, it is in contact with the cylindrical storage cell 9). Only the shape of the part is visible).

  After the storage cell group 5 is stacked, the internal heat exchanging pipe 19A is inserted into the position 25 in a compressed state from the side surface, and the internal heat exchanging pipe 19A is restored inside to be arranged at a predetermined position. It has become. The internal heat exchange pipe 19 </ b> A is also arranged at a predetermined position in the storage cell group 5, thereby serving as a buffer material for preventing the cylindrical storage cells 9 from colliding with each other.

  The outer peripheral heat exchange pipe 19 </ b> B is disposed in the outer peripheral portion of the power storage module 1 and is disposed in a space 27 that is not surrounded by the cylindrical power storage cells 9 located between the two adjacent cylindrical power storage cells 9 and 9. Yes. In the present embodiment, twelve spaces 27 exist, and a total of twelve outer peripheral heat exchange pipes 19 </ b> B are arranged in each of the two spaces 27. The outer periphery heat exchange pipe 19 </ b> B has a cylindrical shape in order to increase the force for fastening the energy storage module 1 by contacting the tape 17 when the outer periphery of the energy storage module 1 is fixed with the tape 17.

  After the internal heat exchange pipe 19A and the outer peripheral heat exchange pipe 19B are arranged at predetermined positions in the power storage cell group 5, the entire power storage module 1 is fixed by tightening the periphery with a belt-like tape 17.

  The joint pipe 23 connects the internal heat exchange pipe 19A and the outer peripheral heat exchange pipe 19B.

[Piping of piping network]
FIG. 5A is a diagram schematically showing a part of the piping of the piping network 7 with the cylindrical storage cell 9 omitted. In this example, an even number of heat exchange pipes 19 are connected in series by a manifold connection pipe 21 and a joint pipe 23, and a heat medium flowing out from the manifold 4 flows in the direction indicated by the arrow and returns to the manifold 4 to form a flow path. Is configured to do. An odd number of heat exchanging pipes 19 can be connected in series, but in this case, since it is necessary to connect the manifolds 4 from the front side of the power storage module 1, Not adopted.

  FIG. 5B is a front view of the power storage module 1 showing an example of connection of the heat exchange pipe 19 when the piping of the piping network 7 shown in FIG. 5A is applied to the power storage module 1. In the present embodiment, the heat exchange pipes 19 are divided into five groups (a) to (e) surrounded by a dotted line. The heat exchanging pipe 19 with the number 1 in each group is connected to the manifold connecting pipe 21 on the back side of the power storage module 1 and is connected by the joint pipe 23 in the manner shown in FIG. The heat exchange pipes 19 are connected so as to be connected in series in the order of numbers 2 → 3 →. That is, the joint pipe 23 that connects the first and second heat exchange pipes 19 appears on the front side of the power storage module 1, and the joint pipe 23 that connects the second and third heat exchange pipes 19 It will appear on the back side of module 1. And the last number in each group (for example, No. 8 for (a) Group, No. 4 for (b) Group, No. 6 for (c) Group) for heat exchange The pipe 19 is connected to the manifold connection pipe 21. The internal heat exchanging pipe 19A is configured so that the portion not in contact with the cylindrical storage cell 9 has a cylindrical shape. Therefore, the manifold connecting pipe 21 and the joint common to the outer peripheral heat exchanging pipe 19B are used. A pipe 23 can be used. It is also possible to use a general-purpose cylindrical joint pipe.

  In order to exhibit sufficient performance, the power storage module 1 of the present embodiment needs to be cooled in a high temperature environment and may need to be heated in a low temperature environment. Therefore, the temperature of the heat medium flowing in the piping network 7 can be changed according to the environment in which the power storage module 1 is used. In the case of the cylindrical storage cell 9 of the present embodiment, it is known from experiments that the appropriate temperature is about 55 ° C. ± 10 ° C. Therefore, the temperature of the heat medium is set to the environment so that this temperature can be maintained. It adjusts in the temperature range of 30 to 70 degreeC according to temperature.

[Second Embodiment]
6A and 6B are diagrams illustrating piping of the piping network according to the second embodiment. Since the configuration is the same as that of FIGS. 5A and 5B except that a part of the configuration of the piping network is different, portions common to the first embodiment are attached to FIGS. 5A and 5B. The reference numerals are added to the reference numerals, and the description thereof is omitted.

  FIG. 6A is a diagram schematically showing a part of the piping of the piping network 107 with the cylindrical storage cell 109 omitted. In the present embodiment, joint piping is not used, and a plurality of heat exchange pipes 119 are sandwiched between two manifolds 104A and 104B, and each of the heat exchange pipes 119 is a manifold connection pipe 121. By connecting to the manifolds 104A and 104B and connecting to the heat exchanger connecting pipes 102A and 102B, a heat medium flowing out from the heat exchanger 103 flows in the direction of the arrow to form a flow path returning to the heat exchanger 103. It is configured.

  FIG. 6B is a front view of the power storage module 101 illustrating an example of connection of the heat exchange pipe 119 when the piping of the piping network 107 illustrated in FIG. 6A is applied to the power storage module 101. In the present embodiment, the heat exchange pipe 119 is divided into four groups (a) to (d) surrounded by a dotted line. Manifolds 104 </ b> A and 104 </ b> B are arranged corresponding to each group, and a heat exchange pipe 119 is connected by a manifold connection pipe 121. By arranging in this way, heat exchange can be performed efficiently between the cylindrical storage cell 109 and the heat exchange pipe 119.

  The above embodiment has been described as an example, and is not limited to the present embodiment unless departing from the gist thereof. For example, in the above embodiment, the lithium ion capacitor is taken as an example of the cylindrical storage cell. However, the present invention is not limited to this, and other types of large capacity capacitors and secondary batteries such as lithium ion secondary batteries are used. The present invention can also be applied to the power storage module.

  Further, for example, the number of cylindrical power storage cells of the above power storage module, the number of cylindrical power storage cells in the cell row, the stacking method, and the like are shown as examples. Therefore, it is of course possible to configure the power storage module with more or fewer than 16 power storage modules. It is also possible to configure a power storage module by stacking more or fewer cell rows. Further, as described above, the so-called stacking configuration may be omitted, and the cylindrical storage cells in the cell row may be stacked so that the center lines overlap in the vertical direction. In that case, the internal heat exchanging pipe 19A is preferably a substantially rectangular shape having four outer surfaces that are curved and extend in the longitudinal direction along the outer surfaces of the four cylindrical energy storage cells.

  The heat exchange pipe is not limited to a rubber material, and a resin material or a metal material can also be used. Moreover, you may make it not provide the piping for outer peripheral part heat exchange.

  The piping of the above piping network is shown as an example, and it is needless to say that the piping network may be connected by other piping methods.

  The method of assembling the power storage module 1 is not limited to the above. For example, after the cell row 10A is configured, the internal heat exchange pipe 19A is arranged, and the cell row 10B is stacked thereon. Is possible.

  According to the present invention, cylindrical power storage cells can be arranged close to each other without using a holder member, so that the power storage module can be made compact. In addition, among the plurality of heat exchange pipes included in the pipe network, three or more outer surfaces of the heat exchange pipes arranged at positions surrounded by three or more cylindrical battery cells are connected to the cylindrical battery cell. Since it curves along the outer surface and extends in the longitudinal direction, the contact area between the cylindrical storage cell and the heat exchange pipe is increased. Therefore, heat exchange can be performed efficiently between the plurality of cylindrical energy storage cells located in the internal region of the energy storage cell group and the heat exchange pipe, and the energy storage module can be used in an appropriate temperature environment. it can.

DESCRIPTION OF SYMBOLS 1 Storage module 2 Heat exchanger connection piping 3 Heat exchanger 4 Manifold 5 Storage cell group 7 Piping network 9 Cylindrical storage cell 10A, 10B, 10C Cell row 11 Bus bar 13 Positive electrode output terminal 15 Negative electrode output terminal 17 Tape 19 For heat exchange Piping 21 Manifold connection piping 23 Joint piping

Claims (7)

Two or more cell rows in which a plurality of cylindrical energy storage cells are arranged in one direction orthogonal to the longitudinal direction of each cylindrical energy storage cell are aligned in the longitudinal direction and the direction orthogonal to the one direction. A storage cell group configured, and
A plurality of heat exchanging pipes through which a heat medium flows and which extends in the longitudinal direction along with the one or more cylindrical energy storage cells to exchange heat with the one or more cylindrical energy storage cells; An electrical storage module having a piping network comprising:
Wherein among the pipes of the plurality of pipes for heat exchange included in the network, each of said a heat exchange pipe is disposed in a position surrounded by said cylindrical storage cells of three or more, the three or more cylindrical power storage A power storage module comprising three or more outer surfaces that are curved so as to be in contact with the outer surface of the cell and extend in the longitudinal direction. The storage cell group includes one cylindrical storage cell included in one of the two adjacent cell columns, and two adjacent cylindrical storage cells included in the other cell column. Having a configuration in which the plurality of cylindrical energy storage cells are arranged so as to face a space formed therebetween,
Of the plurality of heat exchange pipes included in the pipe network, the heat exchange pipes arranged at positions surrounded by the one cylindrical energy storage cell and the two cylindrical energy storage cells are respectively The outer surface of the one cylindrical energy storage cell and the three outer surfaces extending in the longitudinal direction by being curved along the outer surface of the two cylindrical energy storage cells. 2. The power storage module according to 1.   3. The power storage module according to claim 1, wherein the pipe network includes a plurality of the heat exchange pipes that come into contact with one or more cylindrical power storage cells located at an outermost peripheral portion of the power storage cell group. .   The power storage module according to claim 1, wherein the pipe network includes one or more parallel pipe groups including a plurality of the heat exchange pipes connected in parallel to the heat medium source.   The power storage module according to any one of claims 1 to 4, wherein the heat exchange pipe is formed of a rubber material or a resin material.   The power storage module according to claim 1 or 2, wherein a heat medium passed through the heat exchange pipe has a temperature range of 30C to 70C. 5. The power storage module according to claim 1, wherein a portion of the plurality of heat medium pipes that is not in contact with the cylindrical power storage cell has a cylindrical shape.

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