JP5450043B2 - Heat exchanger for battery temperature control system and manufacturing method thereof - Google Patents

Description

  The present invention relates to a heat exchanger for a battery temperature control system installed in an electric vehicle or a hybrid electric vehicle, and a manufacturing method thereof.

Electric vehicles (hereinafter referred to as “EV”) and hybrid electric vehicles (Hybrid)
A battery for traveling, which is mounted on an electric vehicle (hereinafter referred to as “HEV”), is generally accompanied by a cooling device because a large current flows during rapid charging and the battery itself generates heat.

  By the way, the battery for driving | running | working exists in the tendency for the charge amount per unit time to increase by the request | requirement of extension of a mileage, or the request | requirement of shortening of charge time. Therefore, the amount of heat generated from the battery at the time of charging is increased, the charging efficiency is lowered, and the life of the battery is shortened. Therefore, the cooling device is required to ensure and improve the cooling performance.

  As this type of battery cooling device, water-cooled and air-cooled devices are known. From the viewpoint of obtaining a large amount of heat exchange per unit time with the battery, interest in the water-cooled temperature control system is increasing. (Refer to Patent Document 1 described later as a water-cooled type).

  In addition, lithium batteries, nickel metal hydride batteries, sodium sulfur batteries, and the like have been developed as batteries for running, but these batteries are different from conventional batteries for internal combustion engines, such as 100V specifications and 350V specifications. Need to generate high voltage. Therefore, a high voltage is realized by electrically connecting each battery called a module in series.

JP 7-105988 A

  By the way, the structure of the module uses a metal case in order to ensure heat dissipation, and includes a plurality of minimum units as a battery called a cell inside the metal case. Since these cells expand or contract in a non-uniform manner due to charge / discharge, deterioration, or the like, the thickness of the metal case is formed so that it can follow the dimensional change of the cells. For this reason, the heat exchanger that cools the module needs to be configured to efficiently perform heat exchange on the side surface that is configured so that the dimension of the metal case does not change.

  In general, since a vehicle has a small space, a large number of modules are installed in an appropriate posture according to the layout of each vehicle, and the number of stacked layers of modules can vary. For such a module installation situation, the heat exchanger to be used needs to be dimensioned according to the number of stacked layers of the module.

  Accordingly, the present invention provides a heat exchanger for this type of battery temperature control system, which has a structure capable of efficiently exchanging heat, and can be formed to have a size corresponding to the number of stacked modules. The present invention provides a heat exchanger for a battery temperature control system for HEV and HEV and a method for manufacturing the same.

The invention described in the first claim of the present application is used in a battery temperature control system for controlling the temperature of a vehicle-mounted battery composed of a plurality of modules when the reference numerals used in the embodiments are attached, and exchanges heat with the modules. In the heat exchanger,
The heat exchanger 6 is disposed opposite to the side surfaces of the plurality of modules B, B,
A plurality of flow paths 63 and 63 through which the liquid heat medium 40 flows;
A severable part that is provided between the adjacent flow paths and that blocks the flow of the heat medium 40 in the adjacent flow paths, and is provided so that one and the other of the adjacent flow paths can be divided. (Partition parts 64, 64);
Header portions 62, 62 provided at both ends of the flow path in the heat medium flow path direction ,
The flow paths 63 and 63 and the modules B and B that are arranged to face each other on the side surfaces of the plurality of modules B and B are the width direction of the flow paths 63 and 63 and the overlapping direction of the plurality of modules B and B. Is a heat exchanger for a battery temperature control system provided so as to match .

  The invention described in claim 2 of the present application is the heat exchanger for a battery temperature control system formed by bonding two plate members 61, 61 in the invention of claim 1, wherein the heat exchanger 6 is bonded. .

  The invention described in claim 3 of the present application is the invention according to claim 1 or 2, wherein the sum of the dimensions of the width 63w of the flow path 63 and the width of the cuttable portion is substantially equal to the thickness dimension of the module B. Heat exchanger for equal battery temperature control system.

  In the invention described in claim 4 of the present application, in the invention described in any one of claims 1 to 3, the header portion facing the flow path has a heat medium 40 to each flow path. It is a heat exchanger for a battery temperature control system provided with a flow rate adjusting plate 9 for adjusting the flow rate.

The invention described in claim 5 of the present application is a method of manufacturing a heat exchanger used in a battery temperature control system for adjusting the temperature of a vehicle-mounted battery comprising a plurality of modules.
The heat exchanger 6 is disposed opposite to the side surfaces of the plurality of modules B, B,
A plurality of flow paths 63 and 63 through which the liquid heat medium 40 flows;
A severable part that is provided between the adjacent flow paths and that blocks the flow of the heat medium 40 in the adjacent flow paths, and is provided so that one and the other of the adjacent flow paths can be divided. (Partition parts 64, 64);
Header portions 62, 62 provided at both ends of the flow path in the heat medium flow path direction,
The width direction of the flow path of the heat exchanger 6 and the overlapping direction of the plurality of modules are matched, and the cuttable portion of the heat exchanger is cut according to the thickness dimension of the plurality of modules B and B. And it is a manufacturing method of the heat exchanger used for the battery temperature control system which forms the heat exchanger arrange | positioned at the side surface of the said several module.

  In general, a module expands and contracts in the thickness direction due to charge and discharge, and therefore it is not preferable to arrange a heat exchanger in the thickness direction of the module. In this respect, according to the invention described in claim 1 of the present application, the heat exchanger is disposed to face the side surfaces of the plurality of modules, so that the modules can be restrained even if the modules are expanded or contracted due to charging / discharging. Because there is no, it does not cause trouble in the module. In addition, since a cuttable portion is provided between the adjacent flow paths, the heat exchanger can be cut at a site that matches the stacking dimensions of the module, and a heat exchanger according to the layout can be easily obtained. it can.

  In addition, a heat exchanger can be obtained by cutting the heat exchanger at a location that matches the stacking dimensions of the module, so that a heat exchanger according to the layout can be obtained separately. There is no need to prepare it, and therefore the production cost can be reduced.

  According to the invention described in claim 2 of the present application, since the heat exchanger is formed by bonding two plate members, the number of parts can be reduced and the production cost can be reduced.

  According to the invention described in claim 3 of the present application, since the sum of the dimensions of the width of the flow path and the width of the cuttable portion is substantially equal to the thickness dimension of the module, heat exchange matched to the stacking dimension of the module Can be obtained and can be optimized.

  According to the invention described in claim 4 of the present application, the header portion facing the flow path is provided with a flow rate adjusting plate for adjusting the flow rate of the heat medium to each flow path. The flow rate of the flowing heat medium can be adjusted, and the temperature of the plurality of modules can be efficiently controlled.

  According to the fifth aspect of the present invention, the heat exchanger can be cut in accordance with the thickness dimension of the plurality of modules by matching the width direction of the flow path of the heat exchanger with the overlapping direction of the plurality of modules. Since the heat exchangers arranged on the side surfaces of the plurality of modules are formed by cutting the portions, it is possible to easily obtain a heat exchanger having an appropriate size that matches the stacking dimensions of the modules.

  Further, it is not necessary to prepare a dedicated mold or production jig according to the number of stacked layers of the module, and the production cost can be reduced.

  Hereinafter, the present invention will be described based on illustrated embodiments. First, a battery temperature control system in which the present invention is implemented will be described with reference to FIG. 1. In the overall configuration diagram of the battery temperature control system shown in FIG. 1, the first heat exchange unit 1 and the second heat exchange are shown. And unit 20. The first heat exchange unit 1 includes a first heat exchange unit 2 that fills a pipe 3 with a liquid heat medium 40 and exchanges heat with the module (battery) B using the heat medium. The second heat exchange unit 20 includes a second heat exchange unit 21 that radiates or cools the heat medium 40 heat-exchanged by the first heat exchange unit 2. The heat medium 40 is, for example, water or antifreeze, but is not particularly limited thereto.

  The first heat exchange unit 1 includes a heat medium storage unit 4 provided on the downstream side of the first heat exchange unit 2 and a pump 5 that circulates the heat medium 40 of the heat medium storage unit 4 in the pipe 3. Prepare.

  In this battery temperature control system, the battery is rapidly charged by a battery charging stand (not shown). That is, the rapid charging of the battery that is performed in a short time is performed when the vehicle is stopped, and the temperature of the battery rapidly rises. However, in the case of battery charging by regenerative power generation when the vehicle is running, so-called slow charging is performed. With this, even if the temperature of the battery rises, the temperature rise is not so much as to cause a malfunction of the battery.

  When the battery is charged, particularly during rapid charging, the pump 5 is operated to circulate the heat medium in the pipe 3, whereby heat exchange with the module B is performed by the heat medium 40 in the first heat exchange unit 2. The

  The second heat exchange unit 20 includes the second heat exchange unit 21 as described above, and includes a compressor 22 that compresses the refrigerant, and a condenser 23 that cools the refrigerant compressed by the compressor 22. And a decompressor 24a that decompresses and expands the refrigerant cooled by the condenser 23, and an evaporator 25 that evaporates the refrigerant decompressed by the decompressor 24a. The compressor 22 is driven by a motor (not shown). In addition, as the refrigerant used in the second heat exchange unit, chlorofluorocarbon, carbon dioxide, hydrocarbon, or the like is appropriately used.

  In FIG. 1, reference numeral 26 denotes a switching valve. By switching the switching valve 26, temperature control can be performed in the second heat exchange unit 21. Therefore, the temperature adjustment of the module B can be performed in the first heat exchanging unit 2 by this temperature adjustment, so that the battery temperature can be appropriately kept constant to increase the charge / discharge efficiency of the battery.

  For example, if the refrigerant discharged from the compressor 22 and passing through the condenser 23 is caused to flow to the second heat exchange unit 21 by the switching valve 26, the refrigerant is decompressed by the decompressor 24 b upstream of the second heat exchange unit 21. Then, it evaporates in the second heat exchanging portion 21 and cools the heat exchanging unit 1 and can return it to the compressor 22. Further, by appropriately changing the discharge amount of the refrigerant from the compressor 22 and the setting conditions of the decompressor 24b upstream of the second heat exchange unit 21, the first heat exchange unit 1 in the second heat exchange unit 21 is changed. The amount of cooling can be controlled.

  Moreover, you may distribute the refrigerant | coolant discharged from the compressor 22 via the condenser 23 to both the 2nd heat exchange part 21 and the evaporator 25 with the switching valve 26 as needed. In the battery temperature control system shown in FIG. 1, the heat medium storage unit 4 shows an example in which the upper part is open. This is a conceptual configuration of the apparatus, and is not limited to this. Needless to say, the upper portion of the portion 4 can be closed to form a so-called closed circuit.

  As shown in FIGS. 2 and 3, the first heat exchanging unit 2 of this example is configured by arranging a heat exchanger 6 on the upper portion of each block in which a predetermined number of modules B are arranged vertically. Yes.

  In this example, as will be described later (FIG. 5), the heat exchanger 6 uses aluminum plates 61 and 61 having the same structure, and one plate 61 is brazed to the other plate 61 with the top and bottom reversed. Formed. The heat exchanger 6 includes a pair of left and right header parts 62, 62, a plurality of flow paths 63, 63 provided between the header parts 62, 62, and a partition part 64 provided between the flow paths 63, 63. 64. In this example, an aqueous solution is used as the heat medium 40, and at the time of rapid charging of the battery, the heat medium (aqueous solution) passes from one header portion 62 to the flow path 63, as indicated by an arrow in FIG. It is configured to flow to the other header section 62 via 63.

  FIG. 4 is a view showing the heat exchanger 6 of this example, and an assembly 7 such as an inlet / outlet cap is mounted on the header portions 62 and 62. The inlet side includes an inlet cap 71 having a through hole 72, a trumpet-shaped cap 74 that houses the tip of the pipe 73, a rubber ring 75, and a clip 76, and a header cap 62 on the opposite side is provided with a sealing cap 77. Installing. By providing these, as described above, the heat medium 40 that has flowed into one header portion 62 flows to the other header portion 62 via the plurality of flow paths 63 and 63.

  As shown in FIG. 5, the aluminum plate 61 constituting the heat exchanger 6 is press-formed, and includes groove portions 620 and 620 that are components of the header portion 62 formed by overlapping two plates. , Groove portions 630 and 630 which are provided between these groove portions 620 and 620 and constitute a plurality of flow paths 63 and 63, and portions which are provided between these groove portions 630 and 630 and constitute partition portions 64 and 64 The protruding protrusions 640 and 640 are provided.

  The aluminum plate 61 is clad with a brazing material on the surface where two aluminum plates are overlapped, and brazed in the furnace, so that the heat exchanger 6 of this example is formed as shown in FIGS. 6 and 7. The inlet cap 71 and the sealing cap 77 described above are made of an aluminum alloy and are brazed at the same time when brazing.

  In addition, as shown in FIG. 8, the heat exchanger 6 of this example has a plurality of (63 channels in this example) flow paths 63 and 63 and partition portions 64 and 64 formed in advance at predetermined intervals. In correspondence with the number of modules B to be applied, it is cut at a predetermined partition 64 and used. The partition portion 64 is literally partitioned between the adjacent flow paths 63 and 63, and even when cut at this portion, there is no change in the adjacent flow paths 63 and 63. That is, this partition part 64 comprises the cutting | disconnection part of the heat exchanger 6 which concerns on this invention.

In the case of this example, in order to improve the heat exchange efficiency between the heat exchanger 6 and the module B, as shown in FIG. 9, a heat conduction sheet is provided between the flow path 63 of the heat exchanger 6 and the module B. 8 is installed. The heat conductive sheet 8 is a so-called gel sheet, and in this example, a sheet having a thickness of 2 mm and a heat conductivity of 6.5 W / mK is used. B ₁ is a main body of the module B, and B ₂ is a flange portion of the module B. The step between the main body B ₁ of the module B and the flange portion B ₂ of the module B is 3 mm, and the step between the flow path 63 and the partition portion 64 is 1 mm.

  As described above, in the heat exchanger 6 of the present invention, the heat exchanger 6 is cut at a predetermined partition portion 64 in accordance with the number of modules B to be applied, so that the width 63w of the one flow path 63 is equal to the width 63w. The sum of the dimensions of the two cuttable parts (partition parts 64) and the width 64w is formed to be approximately equal to the thickness dimension Bw of one module B.

  In this way, the sum of the dimensions of the width 63w of the flow path 63 and the width 64w of the severable part (partition part 64) is formed to be substantially equal to the thickness dimension Bw of the module B. 6, the width direction of the flow path 63 of the heat exchanger is aligned with the overlapping direction of the plurality of modules B and B, and the heat exchanger 6 has a thickness dimension (lamination dimension) of the plurality of modules. If the cuttable part (partition part 64) is cut, the heat exchanger 6 suitable for the thickness of the modules B and B used can be obtained. And the 1st heat exchange part 2 of this example is comprised by arrange | positioning this heat exchanger 6 to the side surface of modules B and B. As shown in FIG.

  FIG. 10 uses a flow rate adjusting plate 9 for the heat exchanger 6 of this example. That is, the flow rate adjusting plate 9 is inserted into the header portion 62 and fixed, for example, at the time of brazing, and the holes are sequentially changed in size so as to fit the flow paths 63 and 63 of the header portion 62. The portions 91 and 91 are formed. When such a flow rate adjusting plate 9 is used, the flow rate of the heat medium 40 flowing through the flow paths 63 and 63 can be adjusted for each flow path, and the temperature of a plurality of modules can be efficiently controlled. It is.

  In addition to the above examples, the heat exchanger of the battery temperature control system according to the present invention can be modified as appropriate in accordance with the object of the present invention. In the above-described example, a plurality of modules are arranged in the vertical direction, and the heat exchanger is arranged on the upper part. However, a plurality of modules can be stacked (stacked) and arranged opposite to the side surface. .

  INDUSTRIAL APPLICABILITY The present invention is suitable for a liquid heat exchanger for a battery temperature control system for EV and HEV and a method for manufacturing the same.

It is a whole lineblock diagram showing the battery temperature control system in which the present invention is used. It is a figure which shows the 1st heat exchange part in the battery temperature control system of this example, and shows the state by which the heat exchanger which concerns on this invention is used here. It is a block diagram which expands and shows a part of 1st heat exchange part shown in FIG. It is a figure which shows the heat exchanger which concerns on this invention. It is a perspective view of the plate which comprises a heat exchanger. It is a perspective view which shows the heat exchanger which concerns on this invention. It is a perspective view which concerns on the heat exchanger which concerns on this invention, and is partially broken and shown. It is a perspective view which shows the heat exchanger which concerns on this invention. It is a figure which shows the heat exchanger which concerns on this invention, Comprising: (1) is a perspective view which shows a heat conductive sheet and a module collectively, (2) is a figure which overlaps and shows a heat conductive sheet and a module. It is a perspective view which shows the example which concerns on the heat exchanger which concerns on this invention, and used the flow volume adjusting plate.

DESCRIPTION OF SYMBOLS 1 1st heat exchange unit 2 1st heat exchange part 20 2nd heat exchange unit 21 2nd heat exchange part 22 Compressor 23 Condenser 24a Decompressor 24b Decompressor 25 Evaporator 26 Switching valve 3 Piping 4 Heat medium storage part 40 Heat medium 5 Pump 6 Heat exchanger 61 Aluminum plate 62 Header part 620 Groove part 63 Flow path 630 Groove part 64 Partition part 640 Projection part 7 Assembly 71 Inlet cap 72 Through hole 73 Pipe 74 Trumpet-shaped cap 75 Rubber ring 76 Clip 77 Seal Stop cap 8 Thermal conductive sheet 9 Flow rate adjusting plate 91 Hole B Module B ₁ module body B ₂ module flange

Claims (5)

In a heat exchanger for exchanging heat with the module, used in a battery temperature control system for adjusting the temperature of a vehicle-mounted battery composed of a plurality of modules
This heat exchanger is disposed opposite to the side surfaces of the plurality of modules,
A plurality of flow paths through which a liquid heat medium flows;
A severable portion that is provided between the adjacent flow paths and that blocks the flow of the heat medium in the adjacent flow paths, and is provided so that one and the other of the adjacent flow paths can be divided. ,
Header portions provided at both ends of the flow path in the heat medium flow path direction;
Equipped with a,
The battery and the module disposed opposite to each other on the side surfaces of the plurality of modules are provided such that a width direction of the channel and an overlapping direction of the plurality of modules coincide with each other. Heat exchanger for temperature control system.   The heat exchanger according to claim 1, wherein the heat exchanger for a battery temperature control system is formed by bonding two plate members.   The heat exchanger according to claim 1 or 2, wherein a sum of dimensions of the width of the flow path and the width of the cuttable portion is substantially equal to the thickness dimension of the module. Heat exchanger for the system.   The battery according to any one of claims 1 to 3, wherein a flow rate adjusting plate for adjusting a flow rate of a heat medium to each flow path is provided in the header portion facing the flow path. Heat exchanger for temperature control system. In a method of manufacturing a heat exchanger used in a battery temperature control system that adjusts the temperature of a vehicle-mounted battery composed of a plurality of modules,
This heat exchanger is disposed opposite to the side surfaces of the plurality of modules,
A plurality of flow paths through which a liquid heat medium flows;
A severable portion that is provided between the adjacent flow paths and that blocks the flow of the heat medium in the adjacent flow paths, and is provided so that one and the other of the adjacent flow paths can be divided. ,
Header sections provided at both ends of the flow path in the heat medium flow path direction,
Matching the width direction of the flow path of the heat exchanger with the overlapping direction of the plurality of modules, cutting the cuttable portion of the heat exchanger according to the thickness dimension of the plurality of modules, A method of manufacturing a heat exchanger used in a battery temperature control system, comprising forming a heat exchanger disposed on a side surface of a plurality of modules.

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