JP5740189B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device in which a plurality of power storage cells are lined up and housed in a housing.

  As this type of power storage device, a device disclosed in Patent Document 1 includes a heat radiating fin portion (projecting piece 34) protruding outward from the housing (23), and dissipates heat of the power storage cell (capacitor) from the housing. Heat is radiated from the fins to the outside air.

JP 2008-14087 A

  However, such a conventional power storage device does not include a heat sink portion that transfers heat of the storage cell to the housing inside the housing, and can efficiently transfer the heat of the storage cell to the housing. There was a problem that it was difficult.

  In addition, even in a power storage device that includes a heat sink portion that transfers heat of the storage cell to the housing inside the housing, the heat sink portion provided inside the housing and the radiating fin portion protruding outside the housing are separated. Since it is provided on the body, the heat sink part and the radiating fin part are in point contact with each other, and it is difficult to efficiently transfer heat from the heat sink part to the radiating fin part.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a power storage device that can improve the cooling performance of a power storage cell.

The present invention relates to a power storage device in which a plurality of power storage cells each having an electrode terminal protruding in one direction are lined up and housed in a housing, wherein a heat dissipation plate interposed between adjacent power storage cells is a separate body. The heat sink is provided through the casing, and the heat sink is formed in a flat plate shape integrally connected to the heat sink and the heat sink interposed between the adjacent storage cells, and sandwiches the storage cells. in possess a heat radiation fin part which the electrode terminals protrude outward of the housing extending toward the opposite direction, and the housing is provided with a slit heat radiation plate penetrates the opening width of the slit, a plate of the heat sink It was characterized by being formed larger than the thickness .

  According to the present invention, since the heat sink portion and the heat radiating fin portion are integrally formed, heat generated in the storage cell is efficiently transferred from the heat sink portion to the heat radiating fin portion, and escaped from the heat radiating fin portion to the outside air, The cooling property of the storage cell can be improved.

The perspective view of the electrical storage apparatus which shows embodiment of this invention. Similarly, a four-sided view of a power storage device. The bottom view of an electrical storage apparatus similarly. Sectional drawing of the electrical storage apparatus which similarly follows the AA line of FIG. Sectional drawing of the electrical storage apparatus which follows the BB line of FIG. Sectional drawing of the electrical storage apparatus which shows a reference example .

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  A power storage device 1 shown in FIG. 1 is mounted on a construction machine such as a hydraulic excavator and used as a power source for an electric motor or the like, and has a structure that can withstand vibrations and impacts generated in the construction machine.

  Hereinafter, the structure of the power storage device 1 will be described. In the power storage device 1, a power storage module 2 including a plurality of power storage cells 3 is housed in a housing 50.

  The electricity storage cell 3 is a secondary battery that is charged and discharged by a chemical reaction, and for example, a lithium ion secondary battery is used. However, the present invention is not limited to this, and the storage cell 3 may use a capacitor (capacitor) that stores electric charge by electrostatic capacitance.

  As shown in FIG. 4, the power storage cell 3 includes a stacked body 5 that stores power, and a bag-shaped cell case 6 that houses the stacked body 5.

  The stacked body 5 includes a plurality of positive and negative electrode bodies (not shown) and a separator interposed therebetween. This laminated body 5 is housed in a bag-like cell case 6 together with the electrolytic solution.

  The laminate film used as the material of the cell case 6 has a multilayer structure of three or more layers of an intermediate layer of metal foil (aluminum foil) and a resin surface layer sandwiching the intermediate layer.

  The cell case 6 includes a laminated body 5, a case body portion 7 that accommodates an electrolytic solution, and a case end portion 8 in which end portions of a laminate film are bonded together. A case end 8 that protrudes from the case body 7 is provided as an end of the cell case 6.

  The cell case 6 is formed by a process in which end portions of two laminated films are bonded together by, for example, welding. By this step, the case body portion 7 is formed in a rectangular bag shape. The case end portion 8 is formed in a rectangular belt shape protruding from the periphery of the case body portion 7. As shown in FIG. 5, the case end 8 has four sides 8 a to 8 d that extend vertically and horizontally.

  The storage cell 3 includes a pair of electrode terminals 9 that protrude from the cell case 6. Each electrode terminal 9 is connected to each of the positive electrode body and the negative electrode body of the multilayer body 5 accommodated in the cell case 6.

  In the power storage device 1, a plurality of (eight) power storage cells 3 of the power storage module 2 are accommodated in a housing 50 side by side.

  FIG. 1 is a perspective view showing a state in which the electrode terminals 9 of each storage cell 3 are not connected to each other. FIG. 2A is a plan view of the power storage device 1 showing a state in which the electrode terminals 9 of the respective power storage cells 3 are connected to each other.

  In this embodiment, as shown to (a) of FIG. 2, each electrical storage cell 3 of the electrical storage module 2 is connected in series. The storage cells 3 of the storage module 2 are arranged in a line so that the adjacent electrode terminals 9 have a positive and negative relationship. The electrode terminals 9 of the adjacent energy storage cells 3 are alternately connected to each other, and one of the energy storage cells 3 arranged at both ends of the energy storage module 2 is connected to the electrode terminal 9 of the adjacent energy storage cell 3, The other is connected to, for example, a power supply circuit (not shown).

  However, the configuration is not limited to this, and the power storage cells 3 of the power storage module 2 may be connected in parallel. Moreover, it is good also as a structure by which each electrical storage cell 3 is arrange | positioned along with several rows.

  In the power storage device 1, the storage cell 3 is charged and discharged when the power supply circuit is operated. The heat generated in the storage cell 3 as the storage cell 3 is charged and discharged is transferred to the outside of the housing 50 through the heat radiating plate 10 and released to the outside air.

  2A is a plan view of the power storage device 1, FIG. 2B is a front view of the power storage device 1, FIG. 2C is a side view of the power storage device 1, and FIG. It is a bottom view.

  The casing 50 is formed in a rectangular box shape, and the left and right case plates 55 and 56, and the lower case plate 51 and the upper case plate before being fastened side by side with the front end surfaces of the left and right case plates 55 and 56 ( (Not shown), the case plate 53 after being fastened to the rear end surfaces of the left and right case plates 55, 56, the case plate 60 at the bottom portion fastened to the lower end surfaces of the left and right case plates 55, 56, A case plate (not shown) fastened to the upper end surfaces of the case plates 55 and 56.

  As the members constituting the housing 50, metal plates such as aluminum materials are used for the case plates 51, 53, 55, 56, and 60.

  Case plates 51, 53, 55, 56, and 60 are fastened through a plurality of screws. A plurality of (six) holes 58 are formed in the case plate 51, and screws (not shown) inserted through the holes 58 are screwed into screw holes (not shown) formed in the case plates 55 and 56. .

  In a state where a plurality of (eight) power storage cells 3 and a plurality (seven) heat sinks 10 are stacked on the housing 50, the power storage cells 3 are connected to each other via the heat sink 10 between the case plates 51 and 52. Pressed. In addition, it is good also as a structure which compresses and interposes elastic materials, such as a rubber plate, between the case boards 51 and 53 and the electrical storage cell 3 of the both sides contact | abutted to this case boards 51 and 53, and presses the electrical storage cell 3. .

  Screws (not shown) that are screwed into screw holes (not shown) formed in the left and right case plates 55 and 56 are inserted into the holes 65, and the case plate 60 is inserted into the case plates 55 and 56 via these screws. To be concluded.

  A plurality of slits 61 extending in the left-right direction are opened in the case plate 60 provided at the bottom of the housing 50. The slit 61 extends in parallel with the front and rear lower case plates 51 and 53. The interval between the adjacent slits 61 is set to be equal to the dimension (thickness) in the front-rear direction of the storage cell 3.

  In the step of assembling the heat sink 10 to the housing 50, the heat sink 10 is inserted into the slit 61 from the outside of the housing 50. Thereby, the operation | work which assembles the heat sink 10 to the housing | casing 50 is performed easily.

  FIG. 5 is a cross-sectional view taken along line BB in FIG. As shown in FIG. 5, the heat radiating plate 10 includes a heat sink portion 11 that is housed inside the housing 50 and interposed between adjacent storage cells 3, and a heat radiating fin portion 12 that protrudes outward from the housing 50. Have.

  The heat radiating plate 10 is formed in a flat plate shape in which the heat sink portion 11 and the heat radiating fin portion 12 are connected to each other. As the heat sink 10, for example, a metal plate having a high thermal conductivity such as an aluminum material is used. The heat sink 10 has a width of L3.

Inner portion of the housing 50 from the site for inserting the slit 61 of the heat sink 10 is a heat sink portion 11, a portion protruding from the casing 50 to the outside is the heat dissipating fin portion 1 2.

  The heat radiating plate 10 has a structure in which the heat sink portion 11 interposed between the adjacent power storage cells 3 and the heat radiating fin portion 12 protruding outward from the housing 50 are integrally formed. Heat is transferred from the portion 11 to the radiating fin portion 12 and efficiently released to the outside air.

  FIG. 3 is an enlarged view of FIG. 2C and is a bottom view of the power storage device 1. The opening width S1 of the slit 61 is formed larger than the plate thickness S2 of the heat sink 10. Thereby, the insulation between the slit 61 and the heat sink 10 is ensured.

  However, the present invention is not limited to this, and the opening width S <b> 1 of the slit 61 may be formed substantially equal to the plate thickness S <b> 2 of the heat sink 10. In this case, the slit 61 and the heat radiating plate 10 come into contact with each other, heat generated in the power storage cell 3 is transmitted from the heat radiating plate 10 to the case plate 60, and the heat dissipation of the power storage cell 3 is improved.

  FIG. 4 is a cross-sectional view taken along line AA in FIG.

  In the process in which the energy storage cell 3 is interposed in the housing 50, an adhesive is applied to the surface of the case body 7 and the heat sink 10, and the energy storage cells 3 are pressed against each other with the heat sink 10 interposed therebetween. The case body 7 is bonded to the heat radiating plate 10 without a gap.

  The case body 7 of each power storage cell 3 disposed at both ends of the power storage module 2 and the case plates 51 and 53 of the housing 50 are coupled by an adhesive.

  Vibration and impact generated in the vehicle of the construction machine are transmitted to the housing 50 of the power storage device 1, but the case body portion 7 is coupled to the heat sink 10 and the housing 50 with an adhesive, thereby causing vibration and impact. Thus, the storage cell 3 is held so as not to be displaced from the housing 50. As a result, the cell case 6 is prevented from wearing the resin surface layer of the laminate film, and the insulation of the cell case 6 is maintained, so that leakage from the laminate 5 to the cell case 6 is prevented.

  For example, a silicon-based adhesive is used as the adhesive having high thermal conductivity. In the storage cell 3, the case body 7, the heat sink 10, and the housing 50 are bonded without gap through an adhesive having a high thermal conductivity, so that the heat generated in the storage cell 3 is heat sink 11 of the heat sink 10. And is efficiently transmitted to the housing 50.

  In addition, not only this but the structure where the electrical storage cell 3 is laminated | stacked not via the heat sink 10 is good also as a structure which the case body parts 7 which adjoin each other are adhere | attached via an adhesive agent.

  As shown in FIG. 5, the three sides 8 b to 8 d of the case end 8 are formed inside the casing 50 in a state where the plurality of storage cells 3 stacked via the heat sink 10 are accommodated in the casing 50. Interstitial case end accommodating spaces 40b to 40d are provided, and the insulating resin layer 41 is formed by filling an insulating resin formed in the case end accommodating spaces 40b to 40d.

  As a step of forming the insulating resin layer 41, a resin mold that wraps the case end 8 is formed by filling the case end accommodating spaces 40b to 40d with an insulating resin material.

  A case end accommodating space 40 c provided at the bottom of the housing 50 is defined between the bottom case plate 60, the heat radiating plate 10, and the cell case 6, and surrounds the bottom side 8 c of the case end 8. . In a state before the left and right case plates 55 and 56 of the casing 50 are assembled, the case end portion is filled with resin from the nozzles inserted from the left and right sides of the case end portion receiving space 40c. 8 is formed.

  The case end accommodating spaces 40b and 40d are respectively defined between the left and right case plates 55 and 56, the heat radiating plate 10 and the cell case 6, and surround the left and right sides 8b and 8d of the case end 8. . Before the case plates 55 and 56 on the left and right sides of the housing 50 are assembled, the case end receiving spaces 40b and 40d are filled with resin from the nozzles inserted from above the case end receiving spaces 40b and 40d. Insulating resin layers 41 are formed to enclose the bottom sides 8b and 8c of the case end 8 respectively.

  As shown in FIGS. 4 and 5, the case end accommodating spaces 40 b to 40 d are also defined by case plates 51 and 53 provided before and after the housing 50.

  For example, silicon resin or urethane resin is used for the insulating resin layer 41. By performing the process of filling the softened resin into the case end accommodating spaces 40b to 40d, the insulating resin layer 41 that encloses the case end 8 is formed by hardening the filled resin.

  However, the insulating resin layer 41 is not limited to this. For example, a foamed resin material is used, and the softened foamed resin material is filled into the case end accommodating spaces 40b to 40d, thereby filling the resin. It is good also as a structure in which the insulating resin layer 41 which wraps the case edge part 8 is formed by swelling and hardening.

  In this way, the case end portion 8 is wrapped by the insulating resin layer 41, whereby the metal heat sink 10 and the casing 50 are insulated. Thereby, even if a potential is generated in the cell case 6 due to the capacitance of the metal foil of the laminate film, the leakage from the case end 8 to the housing 50 and the heat sink 10 is prevented.

  Further, even if pinholes, breakage, etc. occur in the insulating layer of the laminate film and a high voltage is generated by the stacked power storage cells 3, electric leakage is caused from the case end 8 to the housing 50 and the heat sink 10. It is prevented.

  As shown in FIGS. 4 and 5, an electrode terminal accommodating space 44 for accommodating the electrode terminal 9 is provided inside the housing 50. A step of filling a foamed resin material having insulation between the electrode terminals 9 arranged in the electrode terminal accommodating space 44 is performed. In this step, the foamed resin material swells and hardens to form an electrode surrounding resin layer 45 that encloses the electrode terminal 9 and the upper side 8a of the case end 8 as a foamed resin mold. Thereby, the electrode surrounding resin layer 45 can be formed in a narrow space defined between the adjacent electrode terminals 9 and between the electrode terminals 9 and the housing 50.

  With the structure in which the electrode surrounding resin layer 45 is formed between the electrode terminal 9 and the case plate 53, the electrode terminal 9 is prevented from coming into contact with the case plate 53 due to vibration or impact generated in the housing 50.

  The electrode surrounding resin layer 45 is formed between the adjacent electrode terminals 9, and the electrode terminal 9 is covered with the insulating electrode surrounding resin layer 45, so that the insulating properties of the electrode terminals 9 are ensured and the housing 50, it is possible to prevent the electrode terminal 9 from being shaken by vibrations or shocks generated in the electrode 50, preventing the electrode terminal 9 from coming into contact with the case plate 53, and preventing the electrode terminal 9 from cracking or being cut. it can.

  Hereinafter, the gist, operation, and effect of the present embodiment will be described.

  In the present embodiment, a power storage device 1 in which a plurality of power storage cells 3 are lined up and housed in a housing 50 is provided with a heat sink 10 interposed between adjacent power storage cells 3. Includes a heat sink portion 11 that is accommodated inside the housing 50 and interposed between adjacent storage cells 3, and a heat radiation fin portion 12 that is formed integrally with the heat sink portion 11 and protrudes outward from the housing 50. It was.

  Based on the above configuration, since the heat sink part 11 and the heat radiating fin part 12 are integrally formed, heat generated in the storage cell 3 is efficiently transmitted from the heat sink part 11 to the heat radiating fin part 12, and from the heat radiating fin part 12 to the outside air. As a result, the cooling performance of the storage cell 3 can be improved.

  On the other hand, in the configuration in which the heat sink portion interposed between the adjacent storage cells and the heat radiating fin portion of the housing are formed separately, a portion where the heat sink portion and the heat radiating fin portion are in point contact with each other occurs. As a result, the thermal conductivity decreases between the heat sink portion and the heat radiating fin portion, and the cooling efficiency of the storage cell deteriorates.

  In the present embodiment, the housing 50 and the heat sink 10 are formed separately, and the housing 50 includes a slit 61 through which the heat sink 10 passes.

Based on the above configuration, the heat radiating plate 10 is so penetrates the slit 61, it can be integrally formed with the heat sink 11 and the radiating fin unit 12. Thereby, cooling of the electrical storage cell 3 is performed efficiently.

  Moreover, since the housing | casing 50 and the heat sink 10 are formed in a different body, it becomes possible, for example, to form the housing | casing 50 with resin and to aim at the cost reduction of a product.

  In the present embodiment, the housing 50 includes a case plate 60 that faces the storage cell 3, and a slit 61 is opened in the case plate 60, and the case plate 60 is formed of an insulating resin.

  Based on the above configuration, the heat radiating plate 10 and the housing 50 are insulated by the resin case plate 60, and the electricity storage cell 3 is prevented from leaking to the housing 50 through the heat radiating plate 10. Thereby, it is compatible that the heat sink 10 penetrates the slit 61 to increase the cooling efficiency of the storage cell 3 and the insulation of the storage cell 3 is ensured.

  In addition, the power storage device 1 may be configured such that the case plate 60 in which the slit 61 is opened is formed of metal and an insulating material is interposed between the heat radiating plate 10 and the housing 50.

As a reference example, as illustrated in FIG. 6, the power storage device 71 may have a configuration in which a housing 90 and a heat radiating plate 80 are integrally formed.

  A portion of the heat radiating plate 80 inside the housing 90 is the heat sink portion 81, and a portion protruding outward from the housing 90 is the heat radiating fin portion 82.

  In this case, the housing 90 and the heat radiating plate 80 are integrally formed of metal, so that the cooling efficiency of the power storage cell 3 can be improved and the number of components constituting the power storage device 90 can be reduced. The assembly work of the device 90 is facilitated.

  The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Power storage device 2 Power storage module 3 Power storage cell 5 Laminated body 6 Cell case 7 Cell case body part 8 Cell case edge part 10 Heat sink 11 Heat sink part 12 Heat sink fin part 50 Case 60 Case board 61 Slit

Claims (4)

A power storage device in which a plurality of power storage cells including electrode terminals protruding in one direction are housed in a case,
A heat sink interposed between the adjacent storage cells is provided through the separate casing,
The heat sink is
A heat sink portion interposed between the adjacent storage cells housed inside the housing; and
Wherein formed on the heat sink and the like integrated in the connecting plates have a, a radiating fin portion which protrudes to the outside of the extending toward the opposite direction the casing and the electrode terminals across said energy storage cell,
The housing includes a slit through which the heat radiating plate passes,
The power storage device , wherein an opening width of the slit is formed larger than a thickness of the heat radiating plate .   The power storage device according to claim 1, wherein a width of the heat sink portion is formed larger than a width of the power storage cell. The heat sink, the power storage device according to claim 1 or 2, characterized in that pressing across the energy storage cell. The housing includes a case plate facing the storage cell,
In the case plate, the slit opens,
The power storage device according to any one of claims 1 to 3 , wherein the case plate is made of an insulating resin.

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