JP2010225336A - Battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To thermally bond all battery modules to the inner surface of an outer jacket case with a curved shape in an ideal state while arranging many battery modules in multiple lines, and to efficiently cool the battery modules to reduce a rise in temperature to reduce the difference in the temperatures of all the battery modules to extend life. <P>SOLUTION: In a battery pack, the plurality of battery modules 2 including cylindrical batteries are arranged in a plurality of lines in parallel and received in the outer jacket case 50. The outer jacket case 50 has a curved shape along the surfaces of the battery modules 2 arranged in the plurality of lines, in which the inner surface of the outer jacket case 50 is in a state of surface contact with the surfaces of the battery modules 2 in the plurality of lines. In the battery pack, an elastically pressing material 65 that elastically presses the battery modules 2 in the plurality of lines to the inner surface of the outer jacket case 50 with the curved shape is included in the outer jacket case 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention mainly relates to a battery pack used for a high-output power source such as an electric bike or an assist bicycle assisted by a motor.

  A high-power battery pack has a large output voltage by connecting a large number of batteries in series, and a large output current by connecting them in parallel. A battery pack formed by connecting a large number of batteries in series and in parallel incorporates a large number of batteries. Therefore, it is desirable to cool each battery efficiently to reduce the temperature rise. It is also important to reduce the temperature difference between the batteries. This is because the temperature difference unbalances the electrical characteristics of the battery, which deteriorates the specific battery and shortens the life of the entire battery pack.

  In order to efficiently cool a plurality of batteries stored therein, a battery pack having an outer case made of aluminum and shaped along the surface of the battery has been developed. (See Patent Documents 1 and 2)

JP 2001-307784 A JP 2002-216726 A

  A battery pack having an outer case made of aluminum and having a shape along the surface of the battery can efficiently dissipate the heat of the battery from the outer case to the outside. However, in a battery pack in which the outer case is molded into a shape along the surface of the battery, it is extremely difficult to bring all the batteries into close contact with the outer case in an ideal state. For this reason, a battery that is thermally coupled to the outer case in a preferable state is efficiently dissipated, but the battery that is not able to conduct heat directly away from the inner surface of the outer case has a reduced heat dissipation effect to the outer case, Increase in temperature. For this reason, the temperature difference of each battery becomes large and causes a specific battery to deteriorate.

  The present invention solves the above problem, and while arranging a large number of battery modules in a plurality of rows, all the battery modules are thermally coupled in an ideal state to the inner surface of the curved outer case, It is an object of the present invention to provide a battery pack capable of efficiently cooling a battery module to reduce a temperature rise and further reducing a temperature difference between all the battery modules and extending a lifetime.

Means for Solving the Problems and Effects of the Invention

  In the battery pack of the present invention, a plurality of battery modules 2 made of cylindrical batteries are arranged in a plurality of rows in parallel postures and stored in an outer case 50. The outer case 50 has a curved shape along the surface of the battery modules 2 arranged in a plurality of rows, and the inner surface of the outer case 50 is in surface contact with the surface of the battery modules 2 in the plurality of rows. The battery pack incorporates in the outer case 50 an elastic pressing member 65 that elastically presses the plurality of rows of battery modules 2 against the inner surface of the curved outer case 50.

  In the above battery pack, while arranging a large number of battery modules in a plurality of rows, all the battery modules are thermally coupled to the inner surface of the curved outer case in an ideal state, and the battery modules are efficiently cooled to obtain a temperature. The feature that the life can be extended by reducing the rise and reducing the temperature difference of all the battery modules is realized. This is because the above battery pack elastically presses the battery module against the inner surface of the curved outer case with the elastic pressing material.

In the battery pack of the present invention, a plurality of battery modules 2 are arranged in a plurality of rows in two stages across a separator 60 formed by laminating two separator plates 61, and an outer case 50 is an opposing surface parallel to the separator 60. Is formed in a curved shape along the surface of the plurality of rows of battery modules 2, and is thermally coupled to the surface of the plurality of rows of battery modules 2 in a surface contact state, and an elastic pressing member 65 is disposed between the two separator plates 61. The two or more rows of battery modules 2 can be pressed against the inner surface of the curved outer case 50 via the two separator plates 61.
The above battery pack presses a plurality of rows of battery modules against the inner surface of the curved outer case via the separator plate, so that each battery module is pressed against the inner surface of the curved outer case with a simple structure. The battery module can be efficiently radiated with a small temperature difference.

  In the battery pack of the present invention, the separator plate 61 can be provided with a fitting groove 62 for guiding each battery module 2 on the surface. This battery pack can be efficiently radiated by being thermally coupled to the inner surface of the curved outer case in a preferable state while arranging a plurality of rows of battery modules at a fixed position with a separator plate.

  In the battery pack of the present invention, the elastic pressing member 65 disposed between the separator plates 61 can be either a metal spring 66 or a rubber-like elastic body. This battery pack uses a metal spring or an elastic pressing material such as a rubber-like elastic body to stably press two separator plates and press a plurality of rows of battery modules against the inner surface of the curved outer case, Each battery module can be brought into a preferable thermal coupling state.

  In the battery pack of the present invention, the outer case 50 can be made of aluminum. Since this battery pack uses aluminum excellent in heat conduction for the outer case, the heat of the battery module can be efficiently radiated from the outer case.

  In the battery pack of the present invention, the battery module 2 can linearly connect the battery cells 1 including a plurality of cylindrical batteries. Since this battery pack has a plurality of cylindrical batteries connected in series, each battery module can efficiently dissipate heat while increasing the output voltage.

  In the battery pack of the present invention, an insulating material is sandwiched between the battery module 2 and the inner surface of the curved outer case 50, and the battery module 2 is thermally coupled to the outer case 50 via the insulating material. can do. The battery pack can be brought into a preferable thermal coupling state by pressing the battery module against the inner surface of the curved outer case while insulating the battery module and the outer case.

1 is an external perspective view of a battery pack according to an embodiment of the present invention. FIG. 2 is a vertical cross-sectional view of the battery pack shown in FIG. 1. It is a disassembled perspective view of the battery pack shown in FIG. FIG. 4 is a perspective view of a battery assembly of the battery pack shown in FIG. 3. FIG. 5 is an exploded perspective view of the battery assembly shown in FIG. 4. It is a disassembled perspective view of the separator shown in FIG. It is an expanded sectional view which shows the connection structure of a lead board and a circuit board.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment described below exemplifies a battery pack for embodying the technical idea of the present invention, and the present invention does not specify the battery pack as follows.

  Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The battery pack shown in FIGS. 1 to 5 includes a plurality of battery modules 2 formed by linearly connecting a plurality of cylindrical battery cells 1 and a lead plate formed by connecting the battery cells 1 in series and in parallel. 3, a circuit board 40 on which a voltage detection circuit that detects the voltage of each battery cell 1 connected to the positive and negative electrodes of each battery cell 1 through the lead plate 3 is mounted, the battery module 2, and the circuit board And an exterior case 50 that accommodates 40. Each battery module 2 has the same number of battery cells 1 connected in a straight line, and is arranged in two or more rows in parallel with each other, and a separator between the battery modules 2 in two or more rows. 60 is disposed. In addition, the lead plate 3 includes a main lead plate 9 that connects both ends of each battery module 2 in parallel and connects to the circuit board 40, and a connection portion between the plurality of battery cells 1 that are linearly connected to the circuit board. 40 and a sub lead plate 30 connected to 40.

  The battery module 2 of FIG. 5 has five battery cells 1 connected in a straight line in series. The battery cell 1 is a lithium ion battery that is a cylindrical battery. The battery module 2 is manufactured by disposing a sub lead plate 30 at a connection point between a plurality of battery cells 1 and welding the sub lead plate 30 to the positive and negative electrodes of the adjacent battery cell 1. Since the battery cell 1 is a cylindrical battery, the battery module 2 is a cylindrical battery whose length is an integral multiple of the battery cell 1. The battery module 2 can connect fewer than five or more than five battery cells 1 in a straight line. The battery module 2 adjusts the voltage by the number of battery cells 1 connected in a straight line. Since the battery pack of the present invention connects two sets of battery modules 2 arranged in two stages in series, the output voltage is twice the voltage of the battery module 2. Therefore, in the battery pack in which the battery module 2 is composed of five battery cells 1, ten battery cells 1 are connected in series. Therefore, in a battery pack in which a lithium ion battery having a rated voltage of 3.6V is used for the battery cell 1 and five battery cells 1 are connected in a straight line to the battery module 2, the output voltage is 36V. It becomes. A battery pack in which the battery cell 1 is a lithium ion battery can increase the charge / discharge capacity. However, the battery cell can use all the other cylindrical batteries which can be charged, such as a nickel metal hydride battery, instead of the lithium ion battery.

  The sub-lead plate 30 is a U-bent metal plate in a state in which a flat plate is bent in a U-shape, and the electrodes of the battery cells 1 that are linearly connected to the U-bent metal plates are connected by welding. is doing. The sub lead plate 30 connects the battery cells 1 in the same row in parallel and connects the battery cells 1 connected in a straight line in series. In the illustrated battery pack, six battery modules 2 are arranged in one stage. Accordingly, the sub-lead plate 30 is welded to each of the six battery cells 1 on both sides, and a total of 12 battery cells 1 are welded. The battery cells 1 to be connected are connected in series. Furthermore, the sub lead plate 30 is provided with a connection tab 31 for connecting to the circuit board 40 so as to protrude from one end. The connection tab 31 is connected to the voltage detection circuit of the circuit board 40.

  Since the sub lead plate 30 connects the battery cells 1 in the same stage in parallel and further connects the battery cells 1 connected in a straight line in series, the sub lead plate 30 is connected in a straight line by the sub lead plate 30 and arranged in the same stage. The plurality of battery modules 2 are connected to each other through the sub lead plate 30. Therefore, the battery modules 2 connected by the sub lead plate 30 become battery blocks 4 connected to each other. The battery block 4 in FIG. 5 connects six battery cells 1 in parallel with the sub lead plate 30. Each battery module 2 has five battery cells 1 connected in series in a straight line, and the six battery modules 2 constitute a battery block 4. Furthermore, the battery pack has two sets of battery blocks 4 arranged on both sides of the separator 60, and the battery modules 2 are arranged in two stages.

  Battery blocks 4 arranged in two stages have main lead plates 9 connected to both ends thereof. The main lead plate 9 is connected to the circuit board 40 by connecting both ends of each battery module 2 in parallel. The main lead plate 9 includes all battery modules 2 arranged in the same stage, that is, positive and negative output lead plates 10 connected to one end of the battery module 2 constituting the same battery block 4, and all the batteries. The intermediate lead plate 20 is connected to the opposite end of the module 2.

  The output lead plate 10 connects the edges of the battery modules 2 in parallel. The output lead plate 10 is connected to one end of all battery modules 2 arranged in the same stage, that is, the battery modules 2 constituting the same battery block 4. Further, the output lead plate 10 is connected to the output terminal 13 by connecting the battery modules 2 at the same stage in parallel. The pair of output lead plates 10 connected to the two battery blocks 4 are connected to the positive and negative output terminals 13, respectively.

  The pair of output lead plates 10 shown in FIGS. 4 and 5 are provided with connecting pieces 11 and 12 that protrude from the portion connected to the battery module 2 and are connected to the output terminal 13, respectively. In the figure, one output lead plate 10 </ b> A (left side in FIGS. 4 and 5) is provided with a connection piece 11 protruding from the side edge of the lower end portion, and this connection piece 11 is bent outward of the battery block 4. And it is connected to one output terminal 13A outside the lid case 52 described later. Further, the other output lead plate 10B (right side in FIGS. 4 and 5) is provided with a connecting piece 12 by bending a portion protruding from the upper end in a direction along the battery module 2, and the bent piece 12 is provided. These are fixed to a substrate holder 42 described later and connected to the circuit board 40. Further, the connection piece 12 is connected to the connection lead 15 through the protective element 14 in the substrate holder 42, and the connection lead 15 is connected to the other output terminal 13 </ b> B outside the lid case 52. One of the pair of output terminals 13 disposed outside the lid case 52 is a plus-side output terminal, and the other is a minus-side output terminal.

  The intermediate lead plate 20 connects the battery modules 2 constituting the battery blocks 4 arranged in each stage in parallel, and connects two sets of battery blocks 4 arranged in two stages in series. The intermediate lead plate 20 is made of a single metal plate, is on the side opposite to the output lead plate 10 and is connected to the ends of all the battery modules 2 to connect the two battery blocks 4 in series, and The battery modules 2 at the same stage are connected in parallel. The intermediate lead plate 20 also has a connection tab 21 protruding so as to input the voltage of the battery cell 1 to the circuit board 40, and the connection tab 21 is connected to the voltage detection circuit of the circuit board 40. Since the intermediate lead plate 20 is a single metal plate and connects two sets of battery blocks 4, the two sets of battery blocks 4 are connected to each other with the separator 60 sandwiched between them. It becomes a state.

  As shown in FIG. 6, the separator 60 is formed by laminating two separator plates 61. The separator plate 61 is manufactured by molding an insulating plastic. The separator 60 is arranged between the battery modules 2 arranged in two stages and a plurality of rows, insulates the battery blocks 4 in the two stages, and connects the plurality of rows of battery modules 2 to the inner surface of the curved outer case 50. Press elastically. The separator 60 composed of the two separator plates 61 insulates the two battery blocks 4 and presses them against the inner surface of the outer case 50, so that the outer shape of the separator plate 61 is a quadrangle that is the outer shape of the battery block 4. That is, the separator plate 61 is equal in length and width to the battery block 4.

  Each separator plate 61 shown in FIG. 6 is formed of plastic in a shape having a fitting groove (or curved groove) 62 along the cylindrical battery. The separator plate 61 can be pressed against the inner surface of the outer case 50 while the battery module 2 is guided to the fitting groove 62 and disposed at a fixed position. As shown in FIGS. 1 and 5, since the battery block 4 has six rows of battery modules 2 arranged in parallel, the separator plate 61 is provided with six rows of fitting grooves 62 on the surface. The separator plate 61 can be placed in a fixed position by bonding the battery module 2 to the fitting groove 62 via a double-sided adhesive tape (not shown).

  The two separator plates 61 are provided with an elastic pressing member 65 between them. The elastic pressing member 65 presses the two separator plates 61 in directions away from each other, and elastically presses the separator plate 61 toward the inner surface of the outer case 50. The illustrated elastic pressing member 65 is a plurality of metal springs 66 made of an elastic metal plate, and is disposed between two separator plates 61. The two separator plates 61 are provided with positioning bosses 64 at positions facing each other on the inner surfaces of the two separator plates 61, and one positioning boss 64 is inserted into the other positioning boss 64 while being stacked on each other. . The metal springs 66 are elongated leaf springs extending in the lateral direction of the battery module 2, and a plurality of metal springs 66 are arranged in parallel between the separator plates 61. The middle of the metal spring 66 is fixed to the opposing inner surface of one separator plate 61. The metal spring 66 is fixed to the inner surface of the separator plate 61 via a set screw 67 and a nut 68. One metal spring 66 fixes a plurality of locations to the inner surface of the separator plate 61 so as not to rotate. Further, the metal spring 66 is bent so as to elastically press the unfixed separator plate 61 from the inner surface. The metal spring 66 of FIG. 2 has a plurality of protrusions 66A guided in the recesses 63 between the fitting grooves 62, and is bent so that both ends are arranged on the side edges of the separator plate 61. Processing.

  Further, the separator 60 shown in the figure is a metal spring 66 which is a plurality of elastic pressing members 65, and in order to press the entire surface of the separator plate 61 uniformly, two rows in both ends and in the middle, a total of four rows of metal springs. 66 is disposed. The separator 60 pressed by the elastic pressing member 65 of the metal spring 66 elastically presses the battery module 2 arranged on the surface thereof against the inner surface of the outer case 50 to obtain an ideal thermal coupling state.

  In the battery pack described above, the elastic pressing member 65 of the metal spring 66 is disposed between the two separator plates 61. Instead of the metal spring 66, a rubber-like elastic body is interposed between the two separator plates. It is also possible to dispose and press each separator plate in a separating direction. In the illustrated battery pack, since the battery modules 2 are arranged in a plurality of rows on both surfaces of the separator 60, the elastic pressing member 65 is arranged between the separators 60. However, the battery modules are arranged in one stage. In the battery pack to be arranged, an elastic pressing material is disposed between the separator and the outer case, and the battery module can be pressed against the inner surface of the outer case with the separator.

  A circuit board 40 is disposed on the side edge of the separator 60. The circuit board 40 is disposed at a fixed position on the side edge of the separator 60 via the board holder 42. The substrate holder 42 is manufactured by molding an insulating material such as plastic. The substrate holder 42 shown in FIG. 2 is provided with two rows of guide grooves 44 for guiding the battery modules 2 arranged in two stages on the surface facing the battery block 4. The substrate holder 42 can be arranged so as not to be displaced with respect to the two-stage battery block 4 by guiding the two-stage battery module 2 to the guide groove 44. Further, the substrate holder 42 is provided with a peripheral wall 46 for disposing the circuit board 40 at a fixed position on the outer surface opposite to the surface facing the battery module 2. The circuit board 40 is placed inside the peripheral wall 46 and disposed at a fixed position.

  5 is inserted into the connection tab 31 of the sub lead plate 30 and the connection tab 21 of the intermediate lead plate 20 on both sides of the surface facing the battery block 4. The through-hole 45 is opened and provided. In the illustrated substrate holder 42, a support base 48 that supports the outer periphery of the circuit board 40 disposed inside the peripheral wall 46 is provided so as to protrude from the inner surface of the substrate holder 42, and a through hole 45 is provided in the support base 48. ing. The support base 48 shown in the figure is provided at the lower end portion of the inner surface of the peripheral wall 46 and supports the outer peripheral portion of the circuit board 40 and is disposed at a fixed position. Further, the substrate holder 42 is provided with a connection groove 47 for guiding the connection tabs 31 and 21 inserted in the through hole 45 on the inner surface of the peripheral wall 46. The connecting groove 47 extends in the height direction of the peripheral wall 46 and is connected to the through hole 45, and passes through the connection tabs 31 and 21 inserted through the through hole 45 through the side edge of the circuit board 40. Thus, it can be guided to the upper surface side of the circuit board 40. The connection tab 31 of the sub lead plate 30 and the connection tab 21 of the intermediate lead plate 20 are inserted into the through hole 45 of the substrate holder 42, and are guided by the connecting groove 47 of the peripheral wall 46 to protrude to the upper surface side of the circuit board 40. It is connected to the upper surface of the circuit board 40 by soldering. Further, the substrate holder 42 shown in FIGS. 4 and 7 is provided with a locking rib 49 for fixing the circuit board 40 so as not to come out from the inner surface of the peripheral wall 46 at the end of the substrate holder 42. The locking rib 49 locks the edge of the circuit board 40 and places the circuit board 40 in a fixed position.

  The substrate holder 42 is arranged so that the circuit board 40 is perpendicular to both surfaces of the separator 60 and extends in the longitudinal direction of the battery module 2, and is disposed so as to protrude from both surfaces of the separator 60. Store in place.

  The circuit board 40 is connected to the connection tabs 31 and 21 of the intermediate lead plate 20 and the sub lead plate 30 connected to two sets of battery blocks 4 that are substantially equal to the length of the battery module 2 and arranged in two stages. The width is as possible. The circuit board 40 of FIG. 2 is substantially equal to the width of the two-stage battery block 4. The circuit board 40 is mounted with a voltage detection circuit and a protection circuit that detect the voltages of all the battery cells 1 and control charging / discharging of the batteries. In the battery pack of FIG. 2, five battery cells 1 are connected in series to one battery module 2, and two battery modules 2 are connected in series with an intermediate lead plate 20, so that a total of 10 battery modules 2 are connected. The battery cells 1 are connected in series. Therefore, the voltage detection circuit detects the voltages of the ten battery cells 1 connected in series with each other. Ten battery cells 1 connected in series with each other are connected in parallel with six of each of the battery cells 1, but the voltage of the battery cells 1 connected in parallel is the same voltage. The voltage detection circuit can detect the voltages of all the battery cells 1 by detecting the voltages of the battery cells 1. The voltage of each battery cell 1 is input to the voltage detection circuit via the sub lead plate 30 and the main lead plate 9.

  The lead plate 3 including the main lead plate 9 and the sub lead plate 30 is disposed in parallel to each other and connected to the circuit board 40. The main lead plate 9 inputs the voltage across the battery module 2 to the voltage detection circuit, and the sub lead plate 30 inputs the voltage at the connection point between the battery cells 1 constituting the battery module 2 to the voltage detection circuit. The voltage of each battery cell 1 is input to the voltage detection circuit via the main lead plate 9 and the sub lead plate 30. Therefore, the main lead plate 9 and the sub lead plate 30 input the voltage of each battery cell 1 to the voltage detection circuit and connect all the battery cells 1 in parallel and in series. The lead plate 3 including the main lead plate 9 and the sub lead plate 30 is a metal plate excellent in heat conduction. The lead plate 3 is connected to both ends of all the battery cells 1 arranged in the same stage, connects the battery cells 1 in the same stage in parallel, and further sets the battery cells 1 in the same stage in a thermally coupled state. The temperature difference of the battery cell 1 is reduced.

  The outer case 50 is made of metal, is made of aluminum, and has an opposing surface parallel to the separator 60 formed in a curved shape along the surface of the battery module 2 in two or more rows, and the inner surface is in thermal contact with the surface of the battery module 2. The heat dissipating surface 54 is used. The outer case 50 of FIG. 2 is a curved corrugated surface along the surface of the battery module 2 in which the heat radiating surfaces 54 are housed in two or more rows, and the inner surface is in surface contact with the surface of the battery module 2 and heats over a large area. It is in contact with the combined state. The battery modules 2 housed in the outer case 50 in a plurality of rows in two stages can come into contact with the heat radiating surface 54 in a thermally coupled state on one side. The exterior case can also radiate heat more effectively by providing heat radiation fins on the surface.

  The outer case 50 is manufactured by extruding aluminum. In the outer case 50 manufactured by this method, the opening portions at both ends are closed by the lid case 52. As shown in FIG. 3, the lid case 52 is fixed to the outer case 50 so as to close the openings at both ends of the outer case 50. The lid case 52A that closes one opening (the output lead plate 10 side) of the exterior case 50 is provided with output terminals 13 (13A, 13B) connected to the pair of output lead plates 10. As shown in FIGS. 1 and 3, the cover case 52 </ b> A has a terminal cover 16 made of an insulating resin material fixed to the outside, and the terminal portions 13 a of the pair of output terminals 13 are exposed from the terminal cover 16. I am letting. The lid case 52B that closes the other opening (on the side of the intermediate lead plate 20) of the outer case 50 has a flat shape as a whole.

  Further, in the battery pack shown in FIG. 3, an insulating plate 55 is disposed between the inner surface of the lid case 52 and the main lead plate 9 to insulate the exterior case 50 from the conductive portion. Further, in the battery pack shown in FIG. 2, an insulating material 56 (indicated by a chain line in the figure) is sandwiched between the battery module 2 and the inner surface of the curved outer case 50, and the insulating material 56 is interposed therebetween. Thus, the battery module 2 is thermally coupled to the outer case 50. As this insulating material 56, for example, an insulating sheet excellent in heat conduction can be used. This battery pack insulates the plurality of battery cells 1 and the lead plate 3 from the outer case 50 with an insulating sheet. However, the exterior case can also be insulated from the conductive portion stored by applying an insulating paint on the inner surface.

The above battery pack is assembled in the following steps.
(1) A plurality of battery cells 1 are connected in parallel and in series via the sub lead plate 30 to form a battery block 4.
(2) The two separator plates 61 are laminated with the elastic pressing member 65 of the metal spring 66 interposed therebetween to form the separator 60.
(3) Two sets of battery blocks 4 are arranged on both sides of the separator 60, and the main lead plate 9 is connected to the battery block 4.
(4) The circuit board 40 is connected to the battery block 4 connected in two stages via the board holder 42 to form a battery assembly.
(5) The battery assembly is covered with an insulating sheet which is the insulating material 56 and inserted into the outer case 50. An insulating plate 55 is disposed outside the main lead plate 9 of the battery assembly inserted into the outer case 50, and the lid case 52 is fixed to the opening of the main body case 51.
(6) The output lead plate 10 of the main lead plate 9 is connected to the output terminal 13 outside the lid case 52. The terminal cover 16 is fixed to the surface of the lid case 52 to which the output terminal 13 is fixed.

  The battery pack of the present invention is suitably used as a power source for electric equipment used outdoors, particularly electric bicycles and electric motorcycles.

DESCRIPTION OF SYMBOLS 1 ... Battery cell 2 ... Battery module 3 ... Lead board 4 ... Battery block 9 ... Main lead board 10 ... Output lead board 10A ... Output lead board
10B ... Output lead plate 11 ... Connection piece 12 ... Connection piece 13 ... Output terminal 13A ... Output terminal
13B ... Output terminal
DESCRIPTION OF SYMBOLS 13a ... Terminal part 14 ... Protection element 15 ... Connection lead 16 ... Terminal cover 20 ... Intermediate lead board 21 ... Connection tab 30 ... Sub lead board 31 ... Connection tab 40 ... Circuit board 42 ... Substrate holder 44 ... Guide groove 45 ... Through-hole 46 ... peripheral wall 47 ... connecting groove 48 ... support rib 49 ... locking rib 50 ... exterior case 52 ... lid case 52A ... lid case
52B ... Lid Case 54 ... Heat Dissipation Surface 55 ... Insulating Plate 56 ... Insulating Material 60 ... Separator 61 ... Separator Plate 62 ... Inserting Groove 63 ... Recessed 64 ... Positioning Boss 65 ... Elastic Pressing Material 66 ... Metal Spring 66A ... Projection 67 ... set screw 68 ... nut

Claims (7)

A plurality of battery modules (2) made of cylindrical batteries are arranged in a plurality of rows in a parallel posture and stored in an outer case (50), and the outer case (50) is arranged in a plurality of rows. A battery pack having a curved shape along the surface of the battery module (2), the inner surface of the outer case (50) being in surface contact with the surface of the plurality of rows of battery modules (2),
A battery pack comprising an elastic case (65) that elastically presses the plurality of rows of battery modules (2) against an inner surface of a curved outer case (50). .   The plurality of battery modules (2) are arranged in a plurality of rows in two stages across a separator (60) formed by laminating two separator plates (61), and the outer case (50) is arranged in the separator ( 60) the opposing surface parallel to the surface of the plurality of rows of battery modules (2) is thermally coupled to the surface of the plurality of rows of battery modules (2) in a surface contact state, and the elastic pressing material ( 65) is arranged between the two separator plates (61), and the two-stage multiple rows of battery modules (2) are connected to the curved outer case (50) via the two separator plates (61). The battery pack according to claim 1, wherein the battery pack is pressed against an inner surface.   The battery pack according to claim 2, wherein the separator plate (61) is provided with a fitting groove (62) for guiding each battery module (2) on a surface thereof.   The battery pack according to claim 2, wherein the elastic pressing member (65) disposed between the separator plates (61) is a metal spring (66) or a rubber-like elastic body.   The battery pack according to claim 1, wherein the outer case (50) is made of aluminum.   The battery pack according to claim 1, wherein the battery module (2) is formed by linearly connecting battery cells (1) made of a plurality of cylindrical batteries.   An insulating material (56) is sandwiched between the battery module (2) and the inner surface of the curved exterior case (50), and the battery module (2) is exteriorized via the insulating material (56). The battery pack according to claim 1, wherein the battery pack is in a thermally coupled state to the case (50).

Images