JP2008181765A - Battery pack, and its manufacturing method - Google Patents

Battery pack, and its manufacturing method Download PDF

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Publication number
JP2008181765A
JP2008181765A JP2007014355A JP2007014355A JP2008181765A JP 2008181765 A JP2008181765 A JP 2008181765A JP 2007014355 A JP2007014355 A JP 2007014355A JP 2007014355 A JP2007014355 A JP 2007014355A JP 2008181765 A JP2008181765 A JP 2008181765A
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Prior art keywords
battery pack
battery
surface
electrode terminals
battery cell
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JP2007014355A
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JP5159112B2 (en
Inventor
Wataru Okada
Kazunobu Yokoya
渉 岡田
和展 横谷
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Sanyo Electric Co Ltd
三洋電機株式会社
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage
    • Y02E60/12Battery technologies with an indirect contribution to GHG emissions mitigation

Abstract

<P>PROBLEM TO BE SOLVED: To enable to connect neighboring battery cells mutually without using a bus bar. <P>SOLUTION: This is a battery pack in which a plurality of battery cells 10 are made adjacent, and mutually connected in series and/or in parallel. In a state that the battery cell 10 in which the positive and negative electrode terminals 12 are made protruded from one end face, the battery cell 10 and the end face at which the electrode terminals 12 are installed are arranged nearly in the same plane, and a fixing fixture FS in order to couple the mutual electrode terminals 12 of the battery cell 10 is equipped. The electrode terminals 12 are formed in a plate shape, the electrode terminals 12 are made protruded upward from the end face of the battery cell 10, and have folded back faces 12a by folding back the tips. The neighboring folded back faces 12a of the electrode terminals 12 of the battery cell 10 are mutually made contacted in a superposed state, and coupled in a fixed state by the fixing fixture FS. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a battery pack in which a plurality of battery cells are connected in series and / or in parallel, and a method for manufacturing the same.

Battery packs (packed batteries) or assembled batteries used as power sources for electric vehicles and hybrid vehicles are required to have high output in a limited space, and are easy to arrange with high density in addition to cylindrical battery cells. A square battery is used. In order to electrically connect such battery cells in series or in parallel, a connecting member such as a bus bar is used (for example, Patent Document 1). As shown in FIG. 36, the bus bar BB is screwed to the electrode terminal 12F of each battery cell 10F.
JP-A-5-343105 (FIG. 4)

  However, since the bus bar is an individual member, the number and size of the bus bars to be used increase and the cost increases when the number of connections increases. In particular, in order to meet the demand for higher output in recent years, the number of battery cells used tends to increase. Therefore, the cost of the bus bar cannot be ignored in connection with the bus bar. Moreover, since contact resistance arises in the connection part of the electrode terminal of each battery cell and a bus bar, when the number of use of a bus bar increases, contact resistance will also increase.

  The present invention has been made to solve such problems. A main object of the present invention is to provide a battery pack capable of connecting adjacent battery cells without using a bus bar, and a manufacturing method thereof.

Means for Solving the Problems and Effects of the Invention

  In order to achieve the above object, a battery pack of the present invention is a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel, with positive and negative electrode terminals protruding from one end face. A plurality of battery cells and a fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state in which the battery cells are arranged in a state in which the end surfaces provided with the electrode terminals are substantially aligned on the same plane The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, has a bent curved surface by bending the tip, and the electrode of the adjacent battery cell The bent surfaces of the terminals are brought into contact with each other and are connected to each other in a fixed state by a fixing tool. Thereby, without using a separate member such as a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other for electrical connection, and the electrical connection of the battery cells can be reduced in cost.

  In addition, the fixing device includes an insertion body that is inserted into the connection hole that is opened in the folding surface, and the insertion body is substantially in contact with the end surface of the battery cell in a state in which the folding surfaces that form the connection holes are in contact with each other. It can be configured to penetrate in a vertical direction. Thereby, a connection operation can be performed from the upper surface of the battery pack, and an advantage of excellent workability can be obtained.

  In addition, you may comprise a fixing tool so that an insertion body may penetrate in the direction substantially parallel with respect to the end surface of a battery cell.

  On the other hand, the battery cell is a square battery, the electrode terminal is bent so as to protrude obliquely from the end face of the battery cell, and the bent curved face is bent in a posture substantially perpendicular to the end face of the battery cell. It can also be located in substantially the same plane as the side of the cell. As a result, the electrode terminals themselves of adjacent battery cells can be bent so that the bent surfaces can come into contact with each other, and the connection can be facilitated.

  Further, a pair of electrode terminals may be protruded from the end face of the battery cell so as to be spaced apart from each other, and each electrode terminal may protrude obliquely in different directions. Thereby, the serial connection of adjacent battery cells can be performed easily.

  Further, the connecting hole may be a long hole. By making the connecting hole an elongated hole, the assembly tolerance can be absorbed by the electrode terminal portion, and the load on the terminal portion can be reduced as compared with the case where it is completely fixed by welding.

  Or it may replace with a connection hole and may form a notch shape in a folding surface. Thereby, it is easier to form a notch than the connecting hole, and the mounting operation is also easy.

  On the other hand, the battery cell is a square battery, the electrode terminal protrudes from the end surface of the battery cell in a substantially vertical direction, and the tip is bent into a substantially L-shaped cross-section so as to be parallel to the end surface, thereby forming a horizontal folding surface It can also comprise so that adjacent battery cells may overlap with a horizontal folding surface and it may connect with a fixing tool. Thereby, between adjacent battery cells, a horizontal folding surface can be piled up and connected with a fixture, and another member such as a bus bar can be dispensed with.

  In addition, in the portion where the horizontal folding surfaces of the pair of electrode terminals are overlapped and connected by the fixture, the bending angle of the horizontal folding surface that is superimposed on the upper side is 90 ° or less, and the bending angle of the horizontal folding surface that is superimposed on the lower side is 90 ° or more And the sum of the two may be set to approximately 180 °. Thereby, a pair of electrode terminal can be overlap | superposed by making the angle of the horizontal folding surface of an upper side and a lower side correspond.

  Moreover, a pair of electrode terminal can be comprised so that one bending direction may be bent in the opposite direction to the other bending direction. Thereby, the battery cell which adjoins on both surfaces of a battery cell and each electrode terminal can be connected, and series connection can be implement | achieved easily.

  Furthermore, the bending position of one of the pair of electrode terminals can be bent by being lower than the other bending position by an amount corresponding to the thickness of the electrode terminal. Accordingly, when connecting adjacent battery cells, it becomes easy to superimpose the folded curved surfaces offset by the thickness of the electrode terminals, and the battery cells can be arranged accurately.

  Here, a rivet can be used as the fixture. Thereby, the looseness does not occur like a bolt, and the reliability of the connecting portion can be improved.

  In particular, the fixture may use blind rivets. Thereby, since the connection work can be performed from one side, the work can be facilitated.

  Or a bolt and a nut can also be utilized for a fixture.

  Here, the metal of the electrode terminal protruding from the end surface of the battery cell is different between the positive electrode and the negative electrode, and when overlapping the folded surfaces of adjacent battery cells, the strong electrode terminal is positioned on the lower side with a fixture. It can also be configured to be fixed from above with a certain blind rivet. Thereby, it is possible to prevent the shaft from entering when connecting with the blind rivet.

  In addition, an elastic member can be interposed between the fixture and the contact surface with the electrode terminal. As a result, the connecting surface is pressed by the elastic member to increase the frictional force, and a loosening prevention effect is obtained.

  A spring washer can be used for this elastic member. As a result, the fixing device can be prevented from loosening at low cost.

  On the other hand, in order to measure the voltage of the battery cell, a voltage detection terminal electrically connected to the electrode terminal of the battery cell is provided, and the voltage detection terminal is substantially equal to the connecting hole opened in the folding surface. Alternatively, it is possible to employ a configuration in which a detection terminal hole is opened at an inner diameter larger than this, and the voltage detection terminal is fastened together when the fixture connects the electrode terminals of adjacent battery cells. Thereby, the connection of battery cells and the connection of the terminal for voltage detection can be performed simultaneously, and reduction of a number of parts and improvement of workability | operativity are achieved.

  Here, the voltage detection terminal may have an elastic member, and the elastic member may be connected to be interposed between the fixture and the electrode terminal. As a result, the voltage detection terminal can be provided with a function as an elastic member and interposed between the fixture and the electrode terminal to prevent loosening and further improve workability.

  Furthermore, two or more connecting holes can be opened in the folding surface, and a fixing tool can be passed through each connecting hole and fixed. As a result, the fixture can be doubled or tripled or more to further increase the fastening force of the electrode terminals and improve the reliability.

  Also, an elastic member may be placed in one connecting hole and sandwiched between the fixture and the folded curved surface, and a voltage detection terminal may be placed in the other coupling hole and sandwiched between the fixture and the folded curved surface. it can. Thereby, in addition to increasing the fastening force by making the fixture double or triple, it is possible to efficiently connect the elastic member on one side and the voltage detection terminal on the other side.

  On the other hand, as another battery pack, it is configured such that a bolt is inserted from one side into a folding surface connecting hole where folding surfaces of electrode terminals of adjacent battery cells are overlapped, and the other is screwed into a nut and fixed. You can also. Thereby, a battery cell can be reliably electrically connected by screwing of a volt | bolt and a nut.

  Further, the fixture includes a bolt and a burring portion in which a screw groove is formed by burring a connection hole of one folding surface, and the folding surfaces of electrode terminals of adjacent battery cells are folded surfaces having a burring portion. Can be positioned so as to be positioned below, and a bolt can be inserted from above the connecting hole and screwed into the thread groove of the burring portion to be fixed. Accordingly, the battery cells can be reliably electrically connected by screwing without separately preparing a nut.

  Further, the fixture includes a bolt and a nut portion that fixes a nut so that the opening is aligned with the connection hole of one folding surface, and the folding surface of the electrode terminals of adjacent battery cells has a folding surface. They can be overlapped so as to be positioned below, a bolt can be inserted from above the connecting hole, and screwed into the nut portion to be fixed. Accordingly, the battery cells can be reliably electrically connected by screwing without separately preparing a nut.

  On the other hand, a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other, the plurality of battery cells with positive and negative electrode terminals protruding from one end surface, and the battery cell, A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the end surfaces provided with the terminals are arranged in a substantially uniform plane, and the electrode terminals are formed in a plate shape The plate-like electrode terminal protrudes upward from the end surface of the battery cell, the tip is bent into a substantially L-shaped cross section, has a curved surface, and the connection surface is opened in the folded surface. Are bolts inserted into the connection holes and nuts screwed into the bolts, and the nuts are arranged at regular intervals so as to match the positions of the folding surfaces of the battery cells in a state where a plurality of battery cells are overlapped. Consists of insulating members that are spaced apart and held in a predetermined position In addition, a nut protruding portion provided with nuts at regular intervals protrudes from one surface of the insulating member, and the nut protruding portion can be inserted into the lower surface of the folded curved surface of the electrode terminal bent in a substantially L-shaped cross section. In a state where a plurality of battery cells are overlapped, the folded curved surfaces are brought into contact with each other, and the connecting holes are positioned so that the connecting holes are aligned, the insulating member is inserted from the side surface of the battery pack, The battery pack may be arranged so as to be inserted into the lower surface of the folded curved surface, and in this state, the bolt is inserted into each connection hole and screwed into and connected to the nut of the nut protruding portion. Thereby, the operation | work which positions a nut to each connection hole can be performed collectively, and workability | operativity can be improved.

  On the other hand, in a method of manufacturing a battery pack in which a plurality of battery cells are adjacent to each other and connected in series and / or in parallel, a connection hole is opened at the tip of a plate-like electrode terminal protruding upward from the end face of the battery cell. In addition, the step of bending the tip to form a bent surface, and the battery cell electrode terminals of adjacent battery cells arranged in a state where the end surfaces provided with the electrode terminals are aligned on substantially the same plane And connecting them to each other in a fixed state using a fixture. Thereby, without using a separate member such as a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other for electrical connection, and the electrical connection of the battery cells can be reduced in cost. In addition, a series of production steps up to fixing can be automated or semi-automated, and the production of the battery pack can be made efficient.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery pack and its manufacturing method for embodying the technical idea of the present invention, and the present invention specifies the battery pack and its manufacturing method as follows. do not do. Moreover, the member shown by the claim is not what specifies the member of embodiment. In addition, the size, positional relationship, and the like of members illustrated in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and reference numeral indicate the same or the same members, and detailed description will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing.
(Embodiment 1)

FIG. 1 is an external perspective view of battery pack 100 according to Embodiment 1 of the present invention, FIG. 2 is a side view, FIG. 3 is an exploded perspective view of fixture FS of battery pack 100, and FIG. A perspective view of the battery cell 10 constituting the pack 100 is shown, FIG. 5 is a front view of the battery cell 10, and FIG. 6 is a side view of the battery cell 10. The battery pack 100 shown in these drawings is an in-vehicle battery pack, in which a plurality of battery cells 10 and separators 20 are alternately stacked, and left and right end surfaces are covered with an end plate 30. Specifically, the rectangular battery cells 10 are sandwiched between frame-shaped separators 20 and stacked in multiple stages with the upper and side surfaces of the battery cells 10 exposed.
(Battery cell 10)

  As the battery cell 10, a substantially rectangular prismatic battery covered with a prismatic outer can is used. Square battery cells can be arranged more efficiently than cylindrical batteries, and can increase the energy density per unit volume. Especially for in-vehicle applications, there is a high demand for space saving, which is preferable. For such a battery cell, a rectangular secondary battery such as a lithium ion secondary battery can be used. Moreover, it is good also as a primary battery other than a nickel battery. The electrode terminals 12 of the battery cells 10 are connected in series or in parallel. Furthermore, it is connected to a control circuit (not shown) at the end of the battery pack 100, and the voltage, current, temperature, etc. of each battery cell 10 is measured by the control circuit, and the battery capacity and required charge / discharge amount are determined. Control such as charging and discharging is performed.

As shown in the perspective view of FIG. 4, the battery cell 10 has positive and negative electrode terminals 12 protruding from the upper surface of a rectangular outer can whose sides are chamfered. The position where the electrode terminal 12 protrudes is set to a position where the positive electrode and the negative electrode are symmetrical on the main surface of the outer can. Thereby, when the battery cell 10 is turned over and overlapped, the positive electrode and the negative electrode can be overlapped, and series connection can be easily performed. Each of the electrode terminals 12 is bent into an L-shaped cross section, and a connecting hole 13 is opened in the further bent piece (folded curved surface 12a). In particular, as shown in FIG. 6, the positive and negative electrode terminals 12 are bent in opposite directions, and are formed in such a size and shape that the electrode terminals 12 can be directly connected to adjacent battery cells 10. Thereby, it becomes easy to connect the positive electrode and the negative electrode directly between adjacent battery cells 10 and connect the battery cells 10 in series or in parallel. As shown in FIG. 5, the battery cell 10 is formed with terminal ribs 14 standing upright so as to surround the periphery of the electrode terminal 12, so that the electrolyte in the outer can can leak from the periphery of the electrode terminal 12. Even so, the situation of inadvertent spreading is prevented.
(Separator 20)

As shown in FIG. 1, the battery cell 10 is coated on the outside so as to be sandwiched by separators 20 from both sides. The separator 20 is configured in a frame shape having a size covering the battery cell 10, and exposes both side surfaces and upper and lower end surfaces of the battery cell 10 in a state of covering the battery cell 10, and covers the four corners. Further, the adjacent separators 20 are stacked with the corners in contact with each other. The separator 20 is composed of a member having excellent heat resistance and heat insulation, and is preferably formed of a lightweight and inexpensive resin. For example, a synthetic resin such as polypropylene or polyurethane having a low thermal conductivity (preferably 0.5 W / m or less) can be used. Thereby, while protecting the battery cell 10 with the separator 20, the adjacent battery cells 10 are insulated and insulated. In addition, a slit having a concavo-convex cross section is formed on the bottom surface of the separator 20, and the battery cell 10 is cooled from the side by passing a cooling medium through the slit.
(End plate 30)

In the state where the separators 20 and the battery cells 10 are alternately connected to each other as described above, the end surfaces are covered with the end plate 30 and fixed. The end plate 30 is formed in a size that can cover the battery cell 10 exposed at the end face, and is fixed to be sandwiched from both sides. In this example, a pair of screw holes 32 are protruded from the side surface of the end plate 30, and the end plates 30 are fixed by screwing through extension bolts 34 extended to the side surface of the battery pack 100 on which the battery cells 10 are stacked. The end plate 30 is preferably made of metal or resin, which can be molded by integral molding.
(Electrode terminal 12)

  As shown in FIGS. 5 and 6, the electrode terminal 12 bends the positive electrode and the negative electrode in a cross-sectional L shape in opposite directions, and the position where the electrode terminal 12 is bent is the thickness of the electrode terminal 12 between the positive electrode and the negative electrode. Is offset by the amount corresponding to. Thereby, when the battery cells 10 are stacked as shown in FIG. 3, the folding surfaces 12 a of the adjacent battery cells 10 can be overlapped while the end surfaces of the battery cells 10 are maintained substantially on the same plane.

  The electrode terminals 12 superposed in this way are fixed using a fixing tool FS. When the folding surfaces 12a of the adjacent battery cells 10 are overlapped, the connecting holes 13 opened in the respective folding surfaces 12a are at least partially matched, and an insertion body for the fixture FS is inserted therein. At this time, by increasing the inner diameter of the connecting hole 13 of the upper folded curved surface 12a among the folded curved surfaces 12a to be superimposed, the dimensional tolerance can be absorbed and alignment can be facilitated.

The connecting hole 13 is not limited to a circular shape, and may be a long hole. As a result, fine adjustment of the alignment is further facilitated, and the load on the terminal portion can be reduced as compared with the case where the position is completely fixed by welding. Or a connection hole is not restricted to a through-hole, It is good also as a notch shape. Thereby, formation of notch shape and attachment work can be facilitated.
(Blind rivet 51)

  In the example of FIG. 3, a rivet is used as the fixture FS. The rivet is fastened using plastic deformation of metal. FIG. 7 shows a cross-sectional view of the bent surface 12a of the electrode terminal 12 fixed with rivets. Fixing with rivets is superior in reliability because there is no need for rotation such as screwing, no worry about loosening. The rivet is not limited to a normal rivet, and a blind rivet is preferably used. A blind rivet is a special rivet that can be fastened from one side of a folding surface. FIG. 3 shows the appearance of the blind rivet 51. The blind rivet 51 includes a flange and a shaft (mandrel) inserted through the flange. By pulling up the shaft, the head of the rivet is crushed into a dumpling shape, and the state shown in FIG. 7 can be obtained. This method eliminates the need for large-scale equipment, and eliminates the need for receiving the lower side of the folding surface 12a, so that the folding surface 12a can be fastened very easily.

The battery cell may use different materials for the metal constituting the electrode terminal 12 for the positive electrode and the negative electrode. In this case, the strength above and below the folded curved surface 12a is selected according to the fastening mode of the fixing tool FS such as a rivet. For example, when the blind rivet 51 is used, the bending position is set so that the bent curved surface 12a located on the lower side becomes the electrode terminal 12 having higher strength than the upper side. Thereby, when connecting with the blind rivet 51, it is possible to prevent the shaft from entering. For example, in the case of a lithium ion battery using Al for the positive electrode terminal and Cu for the negative electrode terminal, the bending position on the negative electrode terminal side is higher than the positive electrode side so that the bent surface 12a of the negative electrode terminal having high strength is on the lower side. Adjustment is made so that the distance from the end face of the battery cell is shortened by the thickness of 12 (so that the height is lowered).
(Elastic member 60)

In addition, an elastic member 60 can be interposed to prevent the fixture FS from loosening. By interposing the elastic member 60 between the fixture FS and the folded curved surface 12a, the elastic member 60 presses the connecting surface to increase the frictional force, and a loosening prevention effect is obtained. An example in which a spring washer is used as the elastic member 60 will be described with reference to FIGS. In these drawings, FIG. 8 is an exploded perspective view showing a fixture FS provided with an elastic member 60, FIG. 9 is an exploded side view of the battery pack 200 of FIG. 8, and FIG. 10 is an exploded perspective view showing a state of being fixed by a spring washer. FIG. 11 is a perspective view showing a state of being fixed by a spring washer. As shown in FIG. 10, by inserting the blind rivet 51 through the connecting hole 13 of the folding surface 12a through a spring washer, the elastic member 60 can be easily interposed as shown in FIG. It is possible to prevent loosening.
(Voltage detection terminal 70)

  Moreover, in order to detect an intermediate voltage when a plurality of battery cells are connected in series, the voltage detection terminal 70 may be connected to the battery cell. In this case, the connection process can be saved by making the connection between the voltage detection terminal 70 and the electrode terminal 12 common with the connection of the folding surface 12a. This example will be described with reference to FIGS. In these drawings, FIG. 12 is a perspective view of a battery pack 300 to which a voltage detection terminal 70 for detecting an intermediate voltage of each battery cell is connected, and FIG. 13 is an enlarged view of a connecting portion of the voltage detection terminal 70 in FIG. FIG. 14 shows a side view of the battery pack 300 of FIG. As shown in FIG. 13 and the like, the voltage detection terminal 70 has a detection terminal hole 71 into which the insertion body (the rivet in this example) of the fixture FS can be inserted. The detection terminal hole 71 has an inner diameter substantially equal to or larger than the connection hole 13 opened in the folding surface 12a. Accordingly, when the rivet is inserted into the connecting hole 13 of the bent surface 12a, the detection terminal hole 71 can be inserted together and fastened together, and the connecting operation of the voltage detecting terminal 70 is performed simultaneously with the connecting operation of the electrode terminals. Therefore, labor saving of assembly work is achieved. For example, when a lithium ion battery is used for the battery cell, it is necessary to measure the intermediate voltage of the battery cell. In such a case, it is necessary to connect the voltage detection terminal 70 for each battery cell. Such an improvement in workability is extremely effective. Needless to say, an elastic member 60 such as a spring washer may be interposed as required.

  In addition, the voltage detecting terminal can have the function of the elastic member for preventing the above-described loosening. This example will be described with reference to FIGS. In these drawings, FIG. 15 is an exploded perspective view showing a connecting portion of a voltage detection terminal 70B having such an elastic member 60B, FIG. 16 is a side view of FIG. 15, and FIG. 17 is fixed to the voltage detection terminal 70B. 18 is an enlarged exploded perspective view showing the tool FS, and FIG. 18 is an enlarged perspective view in a state where the voltage detection terminal 70B is fixed. In this example, the portion provided with the detection terminal hole 71 of the voltage detection terminal 70B is formed in a spring washer shape, and the same function as the spring washer can be achieved. The spring washer shape can be formed integrally with the voltage detection terminal 70B. As a result, the number of parts can be reduced to reduce the cost, and the work for inserting the spring washer can be omitted even during assembly, thereby simplifying the work.

  In the above example, only one connecting hole is formed on the bent surface, but two or more connecting holes can be opened. Thereby, the fastening structure by the fixture FS can be doubled or tripled to further increase the fastening force of the electrode terminal and improve the reliability. An example of such a battery pack 400 is shown in FIGS. In these drawings, FIG. 19 is a perspective view of the battery pack 400, FIG. 20 is a side view of FIG. 19, FIG. 21 is an enlarged exploded perspective view showing a connecting portion by a fixture FS, and FIG. Respectively. In the example of the fixture FS shown in these drawings, the electrode terminal 12B is formed so that the plan view is L-shaped, and the folding surface 12b is extended in the longitudinal direction of the end surface of the battery cell. Two 13 and 13B are opened. Further, as shown in FIG. 21, a blind rivet 51 is inserted through one connecting hole 13 as a fixture FS and a spring washer as an elastic member 60, and the blind rivet 51 is inserted into the other connecting hole 13B. Is inserted into the detection terminal hole 71 of the voltage detection terminal 70B integrated with the spring washer shape as the elastic member 60B and fastened in a co-tightened state. Thus, the fastening structure is doubled to increase the reliability, and the voltage detection terminal 70B is arranged on one side, so that the intermediate voltage can be detected.

  In the above example, the voltage detection terminal and the elastic member are arranged on the upper surface of the folding surface. This arrangement can simplify the fastening operation. However, a voltage detection terminal may be arranged between the folded surfaces that are overlapped.

  Furthermore, in the above-described example, the fastening structure in which the electrode terminal is bent in an L-shaped cross section and the fixture FS is inserted in the direction perpendicular to the end face of the battery cell has been described. This method has an advantage that fastening work of the fixing tool FS can be performed at a stretch from the upper surface side of the battery cell in a state where the battery cell is assembled. Further, the bending angle of the folding surface is not limited to 90 °, and can be slightly inclined. That is, if the inclination angle of the other folding surface is adjusted to correspond to the inclination of either the upper or lower folding surface and the sum of the two is 180 °, the folding surfaces are matched. It can be made to contact. By inclining the folding surface, there can be obtained an advantage that, for example, the folding surfaces can be brought into contact with each other smoothly when the battery cells are sent out.

The battery cells are connected to each other by bending the end of the battery cell having the connection hole 13 opened at the end of each electrode terminal to form a bent surface 12a, and the end face provided with the electrode terminal is substantially the same. The electrode terminals of the adjacent battery cells are fastened using the fixture FS in a state where they are arranged in a plane. Thereby, without using another member like a bus bar, the electrode terminals of adjacent battery cells can be brought into direct contact with each other to be electrically connected. In addition, a series of production steps up to fixing can be automated or semi-automated, and the production of the battery pack can be made efficient.
(Embodiment 2)

  On the other hand, it is not restricted to this, The structure which inserts the fixing tool FS in a horizontal direction with a battery cell end surface is also employable. As a battery pack according to Embodiment 2, an example of such a battery pack will be described with reference to FIGS. In these drawings, FIG. 23 is a perspective view showing a state in which the battery cells 10B are connected to each other, and FIG. 24 is a side view. In the battery pack shown in these drawings, the battery cells 10B shown in FIG. 24 are stacked, and the electrode terminals 12C of the battery cells 10B are fixed with rivets. In the battery cell 10B, similarly to the battery cell 10 shown in FIG. 4 and the like, the positive electrode terminal 12C and the negative electrode terminal 12C are protruded from the upper end surface at a symmetrical position. However, the electrode terminal 12C is bent so that the bent surface 12c at the end of the electrode terminal 12C is not parallel to the end surface of the battery cell 10B but is substantially vertical. Specifically, with each electrode terminal 12C being bent at two positions, the electrode terminal 12C is bent so as to protrude obliquely from the end face of the battery cell 10B by the first bending. At this time, each electrode terminal 12C is protruded in the opposite oblique direction. Further, the bent surface 12c is bent in a substantially vertical posture with respect to the end surface of the battery cell 10B by the second bending. At this time, the folding surface 12c is set to be substantially flush with the side surface of the battery cell 10B. Thereby, when battery cell 10B is laminated | stacked, the folding surface 12c of the positive electrode and negative electrode of adjacent battery cell 10B can be contact | abutted.

The battery cell 10B is manufactured with the electrode terminal 12C protruding in a plate shape. After the battery cell 10B is manufactured, the electrode terminal 12C is bent and bent at two locations so as to extend in opposite oblique directions. Is done. The battery cells 10B are sequentially stacked, and the connection holes 13C are riveted and fixed. Riveting is done automatically by a riveting machine.
(Embodiment 3)

  In the above example, the fixing tool is configured with rivets, but the fixing tool is not limited to this, and may be configured with other configurations such as bolts and nuts. As a third embodiment, an example in which a bent surface 12a bent in an L shape is fixed with a bolt 52 and a nut 53 will be described with reference to FIGS. In these drawings, FIG. 25 is a perspective view of the battery pack 500, and FIG. 26 is a side view. The battery pack 500 shown in these drawings can use the same structure as that of FIG. 1 described above for the structure of battery cells, separators, end plates, etc., and detailed description thereof will be omitted. As the fixture FS, a bolt 52 and a nut 53 are used. The bolt 52 is inserted into the connecting hole 13 from the upper surface side of the folding surface 12a, and the nut 53 is disposed on the lower side and screwed together. The nut 53 uses a square nut such as a square nut or a hexagon nut to facilitate screwing. It is possible to release the fixed state of the battery cells once connected by screwing and disassemble them again. On the other hand, a mechanism for holding the nut 53 on the lower side of the folding surface 12a is required at the time of screwing, and workability is deteriorated.

  Therefore, this problem can be solved by using a fixture that does not use a nut. For example, as shown in FIG. 27, FIG. 28, and FIG. 29, a burring portion 13D having a thread groove is provided by burring the connecting hole of the lower curved surface 12a of the electrode terminal 12D of the battery cell 10C. In these drawings, FIG. 27 is a perspective view of the battery pack 600, FIG. 28 is a side view, and FIG. 29 is a perspective view of the battery cell 10C. Thereby, the battery cell 10C can be reliably electrically connected by screwing without preparing a separate nut. Since burring is relatively easy, a fixture can be realized easily and inexpensively. The burring portion 13D is preferably provided on the aluminum electrode terminal 12D. This is because it is softer and easier to process than copper.

Further, as shown in FIGS. 30 to 32, a nut portion 13E is provided to which a nut is fixed so that the connection hole of the folding surface 12a of the lower electrode terminal 12E of the battery cell 10D constituting the battery pack 700 is aligned with the opening. May be. This configuration has the advantage of being stronger in strength than the method using the burring portion. For fixing the nut, a method of fixing the nut to the bent surface 12a by welding or bonding, a method of using a press nut, or the like can be used.
(Embodiment 4)

  In the above example, a case has been described in which a fixing tool is separately prepared for each folding surface 12a and fastened. In this method, it is necessary to position the fixing tool for each folding surface 12a, and there is a problem that it takes time and effort. Therefore, in order to save such work, a plurality of fixtures can be integrated. This example will be described with reference to FIGS. In these drawings, FIG. 33 is an exploded perspective view of the battery pack 800, FIG. 34 is a plan view of the exploded view, and FIG. 35 is a side view of the exploded view. The battery pack 800 shown in this example uses a plurality of nut fixing tools 54 in which a plurality of nuts are fixed in advance at predetermined intervals. Specifically, a plurality of nut protrusions that are insert-molded nuts and an insulating member that fixes the nut protrusions at regular intervals so that the nut protrusions are spaced apart at regular intervals and held in a predetermined posture. Molding. The nut protruding portion is formed in a size that can be inserted into the lower surface of the folded curved surface 12a bent in an L-shaped cross section. In the example of FIG. 33, in order to stack nine battery cells and connect them in series, a plurality of identical nut fixtures 54 having four nut protrusions are arranged on each side surface, and each nut protrusion has a cross-section L The electrode terminals 12 are positioned so as to be inserted in a U-shaped cross section formed by overlapping, and bolts 52 are respectively screwed into the nuts embedded in the nut protrusions. Thereby, the operation | work which positions a nut to each connection hole can be performed collectively, and workability | operativity can be improved.

  The battery pack and the manufacturing method thereof according to the present invention can be suitably applied as a power supply device for a vehicle such as an electric vehicle or a hybrid vehicle.

1 is an external perspective view of a battery pack according to Embodiment 1 of the present invention. It is a side view of the battery pack of FIG. It is a disassembled perspective view which shows the fixing tool of the battery pack of FIG. It is a perspective view of the battery cell which comprises a battery pack. It is a front view of the battery cell of FIG. It is a side view of the battery cell of FIG. It is sectional drawing of the folding surface of the electrode terminal fixed with the rivet. It is a disassembled perspective view which shows a fixing tool provided with an elastic member. It is a disassembled side view of the battery pack of FIG. It is a disassembled perspective view which shows the state fixed with a spring washer. It is a perspective view which shows the state fixed with the spring washer of FIG. It is a perspective view of the battery pack which connected the terminal for voltage detection which detects the intermediate voltage of each battery cell. It is an enlarged view of the connection part of the terminal for voltage detection of FIG. It is a side view of the battery pack of FIG. It is a disassembled perspective view which shows the connection part of the terminal for voltage detection provided with an elastic member. FIG. 16 is a side view of FIG. 15. It is an expansion exploded perspective view showing a voltage detection terminal and a fixture. It is an expansion perspective view which shows the state which fixed the terminal for voltage detection. It is a perspective view of the modification of a battery pack. FIG. 20 is a side view of FIG. 19. It is an expansion disassembled perspective view which shows the connection part by a fixing tool. It is an expansion perspective view which shows a fastening state. It is a perspective view which shows the state which connected the battery cells which concern on Embodiment 2. FIG. It is a side view of the battery cell coupling body of FIG. 6 is a perspective view of a battery pack according to Embodiment 3. FIG. It is a side view of the battery pack of FIG. It is a perspective view of the battery pack which carried out the burring process to the connection hole. It is a side view of the battery pack of FIG. It is a perspective view of the battery cell of FIG. It is a perspective view of the battery pack which provided the nut part in the lower folding surface. It is a side view of the battery pack of FIG. It is a perspective view of the battery cell of FIG. It is a disassembled perspective view of the battery pack using a multiple nut fixture. FIG. 34 is an exploded plan view of the battery pack of FIG. 33. FIG. 34 is an exploded side view of the battery pack of FIG. 33. It is a perspective view which shows the battery pack which electrically connected the battery cell using the conventional bus bar.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100-800 ... Battery pack 10, 10B-10D, 10F ... Battery cell 12, 12B-12E, 12F ... Electrode terminal 12a-12c ... Folding curved surface 13, 13B-13C ... Connecting hole 13D ... Burring part 13E ... Nut part 14 ... Terminal rib 20 ... Separator 30 ... End plate 32 ... Screw hole 34 ... Extension bolt 51 ... Blind rivet 52 ... Bolt 53 ... Nut 54 ... Multi-nut fixing tool 60, 60B ... Elastic member 70, 70B ... Voltage detection terminal 71 ... Detection Terminal hole FS ... Fixing tool BB ... Bus bar

Claims (26)

  1. A battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
    A plurality of battery cells in which positive and negative electrode terminals protrude from one end surface;
    A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane,
    With
    The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, has a bent curved surface by bending the tip,
    A battery pack, wherein the folded surfaces of electrode terminals of adjacent battery cells are brought into contact with each other in a superposed state and connected in a fixed state by the fixing tool.
  2. The battery pack according to claim 1,
    The fixture includes an insertion body that is inserted through a connection hole that is opened in a folding surface.
    A battery pack, wherein the insertion body is configured to penetrate in a direction substantially perpendicular to the end face of the battery cell in a state where the bent curved surfaces in which the connection holes are formed are in contact with each other.
  3. The battery pack according to claim 1,
    The fixing device includes an insertion body that passes through a connection hole that is opened in a folding surface,
    The battery pack, wherein the insertion body is configured to penetrate in a direction substantially parallel to an end face of the battery cell.
  4. The battery pack according to any one of claims 1 to 3,
    The battery cell is a prismatic battery;
    The electrode terminal is bent so as to protrude obliquely from the end face of the battery cell, and the bent surface is bent in a posture substantially perpendicular to the end face of the battery cell, and is substantially flush with the side face of the prismatic battery cell. A battery pack characterized by being located in
  5. The battery pack according to any one of claims 1 to 4,
    A battery pack, wherein a pair of electrode terminals protrudes from the end face of the battery cell so as to be spaced apart, and each electrode terminal protrudes obliquely in different directions.
  6. The battery pack according to any one of claims 2 to 5,
    The battery pack, wherein the connection hole is a long hole.
  7. The battery pack according to any one of claims 2 to 5,
    Instead of the connection hole, the battery pack is formed by forming a notch shape in the folding surface.
  8. The battery pack according to any one of claims 3 to 7,
    The battery cell is a prismatic battery;
    The electrode terminal protrudes from the end surface of the battery cell in a substantially vertical direction, and the tip is bent into a substantially L-shaped cross section so as to be parallel to the end surface to form a horizontal folding surface. A battery pack configured to overlap curved surfaces and to be connected by the fixture.
  9. The battery pack according to any one of claims 3 to 8,
    In the portion where the horizontal folding surfaces of the pair of electrode terminals are overlapped and connected by the fixture, the bending angle of the horizontal folding surface superimposed on the upper side is 90 ° or less, and the folding angle of the horizontal folding surface stacked on the lower side is 90 °. It is above, The sum of both is about 180 degrees, The battery pack characterized by the above-mentioned.
  10. The battery pack according to any one of claims 3 to 9,
    The battery pack, wherein the pair of electrode terminals is bent in a direction in which one bending direction is opposite to the other bending direction.
  11. The battery pack according to any one of claims 3 to 10,
    The battery pack, wherein one of the pair of electrode terminals is bent at a lower position than the other bent position by an amount corresponding to the thickness of the electrode terminal.
  12. The battery pack according to any one of claims 1 to 11,
    The battery pack, wherein the fixture is a rivet.
  13. The battery pack according to any one of claims 1 to 12,
    The battery pack, wherein the fixture is a blind rivet.
  14. The battery pack according to any one of claims 1 to 12,
    The battery pack, wherein the fixture includes a bolt and a nut.
  15. The battery pack according to claim 13,
    The metal of the electrode terminal protruding from the end face of the battery cell is different between the positive electrode and the negative electrode,
    A battery pack comprising a configuration in which when a folded surface of adjacent battery cells is overlapped, a strong electrode terminal is positioned on the lower side and fixed from above with a blind rivet as a fixture.
  16. The battery pack according to any one of claims 1 to 15,
    The battery pack, wherein the fixing member has an elastic member interposed on a contact surface with the electrode terminal.
  17. The battery pack according to claim 16, wherein
    The battery pack, wherein the elastic member is a spring washer.
  18. The battery pack according to any one of claims 1 to 17, further comprising:
    In order to measure the voltage of the battery cell, it has a voltage detection terminal electrically connected to the electrode terminal of the battery cell,
    The voltage detection terminal has a detection terminal hole opened in an inner diameter substantially equal to or larger than a connection hole opened in a folding surface,
    The battery pack is formed by fastening the voltage detection terminals together when the fixtures connect the electrode terminals of adjacent battery cells.
  19. The battery pack according to claim 18, wherein
    The voltage detection terminal has an elastic member,
    A battery pack, wherein the elastic member is connected to be interposed between the fixture and the electrode terminal.
  20. The battery pack according to claim 18 or 19,
    Two or more connecting holes are opened in the folding surface,
    A battery pack, wherein a fixing tool is passed through each connecting hole and fixed.
  21. The battery pack according to claim 20, wherein
    In one connecting hole, an elastic member is placed and sandwiched between the fixture and the folding surface,
    A battery pack, characterized in that a voltage detection terminal is disposed in another connecting hole and sandwiched between a fixture and a folding surface.
  22. The battery pack according to claim 14, wherein
    A battery pack, wherein a bolt is inserted from one side into a connecting hole having a bent surface obtained by overlapping the bent surfaces of electrode terminals of adjacent battery cells, and the other is screwed into a nut and fixed.
  23. The battery pack according to any one of claims 1 to 12,
    The fixture includes a bolt and a burring portion in which a thread groove is formed by burring a connection hole of one folding surface,
    The folding surfaces of the electrode terminals of adjacent battery cells are overlapped so that the folding surface having the burring portion is positioned below, and a bolt is inserted from above the connecting hole and screwed into the screw groove of the burring portion. A battery pack characterized by being fixed.
  24. The battery pack according to any one of claims 1 to 12,
    The fixture includes a bolt and a nut portion that fixes a nut so that the opening coincides with a connection hole of one folding surface,
    Overlay the folding surfaces of the electrode terminals of adjacent battery cells so that the folding surface with the nut part is positioned below, and insert the bolt from above the connection hole and screw it into the nut part and fix it. The battery pack characterized by becoming.
  25. A battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
    A plurality of battery cells in which positive and negative electrode terminals protrude from one end surface;
    A fixture for connecting the electrode terminals of adjacent battery cells to each other in a fixed state in a state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane,
    With
    The electrode terminal is formed in a plate shape, the plate electrode terminal protrudes upward from the end surface of the battery cell, the tip is bent into a substantially L-shaped cross section, has a curved surface, and is connected to the folded surface. The hole is open,

    The fixing tool is a bolt inserted into the connection hole and a nut screwed into the bolt, and in a state where a plurality of battery cells are overlapped with each other, to match the position of the folding surface of each battery cell, It is composed of an insulating member that keeps the nuts spaced apart at a predetermined interval and holds them in a predetermined posture, and a nut protruding portion provided with the nuts at a constant interval protrudes from one surface of the insulating member,
    The nut protrusion is formed in a size that can be inserted into the lower surface of the bent surface of the electrode terminal bent in a substantially L-shaped cross section,
    In a state where a plurality of battery cells are overlapped to contact each folding surface and are positioned so that the connecting holes are aligned, the insulating member is inserted from the side surface of the battery pack, and the nut protrusions are inserted into the lower surface of the folding surface, respectively. In this state, the battery pack is configured such that a bolt is inserted into each of the connection holes, and is screwed and connected to the nut of the nut protrusion.
  26. A method of manufacturing a battery pack in which a plurality of battery cells are adjacent and connected in series and / or in parallel to each other,
    Opening a connection hole at the tip of a plate-like electrode terminal protruding upward from the end face of the battery cell, and bending the tip to form a bent surface;
    In the state where the battery cells are arranged in a state where the end surfaces provided with the electrode terminals are substantially aligned on the same plane, the electrode terminals of adjacent battery cells are connected to each other in a fixed state using a fixture,
    The manufacturing method of the battery pack characterized by including.
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WO2019159451A1 (en) * 2018-02-16 2019-08-22 株式会社日立製作所 Battery module

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