JP6136697B2 - Assembled battery - Google Patents

Assembled battery Download PDF

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Publication number
JP6136697B2
JP6136697B2 JP2013151916A JP2013151916A JP6136697B2 JP 6136697 B2 JP6136697 B2 JP 6136697B2 JP 2013151916 A JP2013151916 A JP 2013151916A JP 2013151916 A JP2013151916 A JP 2013151916A JP 6136697 B2 JP6136697 B2 JP 6136697B2
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circuit board
bus bar
fixing member
board fixing
wiring portion
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JP2015022965A (en
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啓善 山本
啓善 山本
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株式会社デンソー
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Description

  The present invention relates to an assembled battery in which a large number of battery cells are stacked, the battery cells are pressurized in the stacking direction, and the expansion of the battery cells is restricted.

  Conventionally, an assembled battery described in Patent Document 1 is known. This assembled battery consists of a set of battery cells. Each battery cell has positive and negative electrode terminals on one side of a rectangular parallelepiped battery cell case. Adjacent battery cells are connected by a bus bar that connects electrode terminals to form an assembled battery.

  A battery cell expand | swells when an electric current flows. In order to suppress the expansion and improve the output characteristics, it is known to apply pressure to the side surface of the battery, that is, pressurize and restrain the battery cell in the stacking direction. When the battery cells are restrained, the position of the electrode terminal protruding from each battery cell is also fixed. The position of this electrode terminal varies slightly between products.

  Even if the position of the electrode terminal is determined at the design stage, the position of the electrode terminal of the actual product after assembly varies, so there is a gap between the position of the electrode terminal of the actual product and the position of the electrode terminal in the design drawing. An error occurs. A slight difference in size of each battery cell is accumulated, resulting in a large accumulation error in the entire assembled battery.

  In order to solve this problem, in Patent Document 1, soft resin first hinges are provided between bus bars adjacent to each other in the stacking direction to absorb dimensional variations. Moreover, the electric wire which detects the voltage of a battery cell is connected to the bus bar. The electric wire is fixed and accommodated in a resin-made accommodation portion. In order to deal with accumulated errors in the position of the bus bar, soft resin second hinges are provided between the housing portions for housing the wires to absorb the dimensional variation.

  In Patent Document 1, a circuit board for detecting voltage and temperature is not shown, and it is considered that the circuit board is provided outside the assembled battery via a large number of wires connected to the connector of the assembled battery.

JP 2010-170884 A

  As described above, in Patent Document 1, a circuit board (for example, called a battery monitoring board, a cell computer, a battery ECU, or the like) that detects voltage and temperature is connected to a connector of a battery pack (see FIG. It is provided outside the assembled battery via a number of battery cells). However, it is considered that the circuit board is accommodated in the assembled battery in order to shorten the wiring.

  The circuit board itself is a hard one with little dimensional expansion / contraction. On the other hand, the resin member having the above-described hinge is accompanied by expansion / contraction of dimensions. It has been difficult to mount the circuit board in the assembled battery using the dimension error absorbing mechanism including the hinge. This is because when the bus bar itself is expanded and contracted by the hinge, a force accompanying expansion and contraction acts on the circuit board. In order to attach the circuit board, it is necessary that the portion of the base on which the circuit board is placed be a member having rigidity that does not expand and contract. If such a member having high rigidity is used, the hinge cannot be used.

  Therefore, there is a problem that a rigid body such as a circuit board cannot be fixed to a circuit board fixing member including a bus bar and a member that holds the bus bar using the concept of Patent Document 1. Therefore, a circuit board is attached inside the assembled battery, and a dimension error absorbing mechanism is required instead of the hinge.

  The present invention has been made paying attention to such problems existing in the prior art, and the purpose thereof is to allow the circuit board to be mounted in the assembled battery and to be coupled by the circuit board and the wiring portion. Another object of the present invention is to provide an assembled battery having a new dimension error absorbing mechanism for a bus bar.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

  In order to achieve the above object, the present invention employs the following technical means. That is, in one of the present invention, a battery pack is configured in which a plurality of battery cells (1) are stacked and the battery cells (1) are pressed and restrained in the stacking direction. The assembled battery includes a circuit board (14) for detecting the voltage of the battery cell (1), a circuit board fixing member (13) for mounting the circuit board (14) extending in the stacking direction, and a circuit board fixing member (13). And a wiring portion (15) disposed in the.

The wiring portion (15) includes a plurality of bus bars (151) juxtaposed in the stacking direction to connect the electrode terminals (2, 3) of each battery cell (1), a bus bar (151), and a circuit board (14). ). The wiring portion (15) includes a flexible wiring portion (153) that is flexible at least in part and allows movement of the bus bar (151) in the stacking direction.
Further, a bus bar holding member (132) that surrounds and stores the bus bar (151), and a flexible connecting portion (1321, 1322) that connects the bus bar holding member (132) and the circuit board fixing member (13). And comprising. The bus bar holding member (132), the connecting portions (1321, 1322), and the circuit board fixing member (13) are formed as an integral resin molded product.
The flexible wiring portion (153) has a hole portion (1533) in which a pin (21, 22) provided integrally with a wiring portion connecting the flexible wiring portion (153) and the circuit board (14) is fitted. Have. The pins (21, 22) are coupled to the flexible wiring portion (153) so as to be energized while being fitted in the hole portion (1533). The connecting portions (1321, 1322) connect the bus bar holding member (132) and the circuit board fixing member (13) as separate members apart from the flexible wiring portion (153).

  According to the present invention, the flexible wiring portion is provided between the bus bar that is required to adjust the mounting position and the circuit board that is required to determine the mounting position. Even if an error occurs, the error can be absorbed.

  In another aspect of the present invention, a smoke exhaust duct (12) is provided between the circuit board fixing member (13) and the plurality of battery cells (1) to release smoke generated when the battery cell (1) fails. Prepare.

  According to this invention, when a battery cell fails, smoke can be escaped through the smoke exhaust duct.

  In addition, the code | symbol in parentheses described in a claim and each said means is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

It is a disassembled perspective view of the assembled battery in 1st Embodiment of this invention. It is an enlarged plan view which shows the wiring part in the said embodiment, a circuit board fixing member, and a circuit board. It is a disassembled perspective view of the assembled battery which comprises 2nd Embodiment of this invention. It is an expansion perspective view of the bus-bar and flexible wiring part in the said 2nd Embodiment. It is an enlarged plan view which shows the wiring part which shows the modification of the said 2nd Embodiment, a circuit board fixing member, and a circuit board. It is a partial block diagram which shows the flexible wiring part and bus-bar holding member in 3rd Embodiment of this invention. It is a perspective view of the circuit board fixing member in 4th Embodiment of this invention.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. 1 and 2. FIG. 1 shows an assembled battery constituting the first embodiment of the present invention. The assembled battery is formed by stacking a plurality of battery cells 1 called unit batteries.

  Each of the battery cells 1 is called a can type, and has positive and negative electrode terminals 2 and 3 above. The battery cells 1 are stacked and pressurized at a constant pressure of 500 kg to 1 ton, and a highly rigid metal restraining body (U-shaped restraining bands 4 and 5 and press plates 6 and 7 at both ends) is stacked in the stacking direction. It is restrained so as not to extend. The pressure plates 6 and 7 are also called end plates 6 and 7 and restrain the battery stack 8 that is a stacked body of the battery cells 1 from both sides.

  In FIG. 1, only the upper two restraining bands 4 and 5 are shown, but two restraining bands are also provided at the lower portion of the battery stack 8. As long as the restraining band does not stretch, the battery cell 1 does not substantially expand.

  Thereby, the expansion of the battery cell 1 when a current flows through the battery cell 1 is suppressed, and the performance degradation of the battery cell 1 is prevented. The position of each battery cell 1 is slightly different between products due to deviation and dimensional variation during stacking.

  Between the electrode terminals 2 and 3 of the battery cell 1, there is provided a cut portion that becomes a smoke exhaust portion 9 that is opened when gas is generated in the battery cell 1 to guide the gas to a safe place. Although the smoke exhausting part 9 is normally closed, it is opened by gas pressure and exhausted. The exhausted gas is guided into the exhaust duct 12 fixed to the exhaust duct mounting rails 10 and 11, and is discharged to a predetermined place. The smoke exhaust duct 12 is formed of a U-shaped channel made of metal or synthetic resin, and is also an aggregate that increases the rigidity of the circuit board fixing member (also referred to as a bus bar module case) 13.

  A circuit board fixing member 13 made of a synthetic resin is provided in contact with the smoke exhaust duct 12. The circuit board fixing member 13 includes a fixed portion central portion 131 that contacts the back portion 121 of the smoke exhaust duct 12, and a number of boats or saddle-shaped bus bar holding members 132 that are attached to the right and left from the central portion of the fixed portion. Is formed.

  Further, a substrate housing portion 133 of the circuit board 14 is integrally formed at one end of the fixed portion central portion 131. The circuit board 14 detects the voltage and temperature of the battery cell 1.

  Then, the detected temperature value and voltage value are transmitted via a communication line to an upper circuit board (ECU) via an outlet connector 141 forming a connector portion of the circuit board 14. The circuit board fixing member 13 has rigidity and extends in the stacking direction in order to attach the circuit board 14. The circuit board fixing member 13 is made of a resin member, and the wiring portion 15 is disposed and fixed on the resin member.

  The circuit board fixing member 13 is provided with a bowl-shaped bus bar holding member 132 that houses a copper bus bar 151 having a thickness of about 1 mm. The plurality of bus bars 151 and the plurality of bus bar holding members 132 are juxtaposed in the stacking direction in order to connect the electrode terminals 2 and 3 of the battery cell 1.

  A wiring portion 15 formed as a flexible printed wiring (FPC) is placed on the circuit board fixing member 13. The wiring portion 15 has a wiring center portion 152 in which a lead frame (metal thin plate) 154 forming a large number of thin copper wirings is sandwiched between transparent resin plates. The wiring center portion 152 is formed as a flexible printed wiring, but may be a bundle of many wirings as will be described later. The lead frame 154 in the wiring portion 15 is connected to a metal bus bar 151 via a flexible wiring portion (also referred to as a flexible portion) 153 that is a part of the wiring portion 15.

  FIG. 2 shows an enlarged view of the wiring section 15, the circuit board fixing member 13, and the circuit board 14 in the first embodiment. A wiring portion 15 is formed by the bus bar 151, the flexible wiring portion 153, and the lead frame 154 in the wiring center portion 152. The flexible wiring part 153 forms part of the voltage detection line.

  The bus bar 151 has two terminal coupling holes 1511 and 1512 to which the electrode terminals 2 and 3 of the adjacent battery cells 1 are connected. The electrode terminals 2 and 3 (FIG. 1) are inserted into the terminal coupling holes 1511 and 1512 to be connected. Thereby, the some battery cell 1 is connected in series. The voltage of the bus bar 151 is guided to the circuit board 14 via the flexible wiring part 153 and the lead frame 154 in the wiring center part 152. The circuit board 14 is housed in the board housing portion 133 of the circuit board fixing member 13, and the board cover 16 is covered as shown in FIG. Further, a module cover 17 made of a transparent synthetic resin is placed above the wiring portion 15 to prevent an electric shock or the like.

  As described above, each of the battery cells 1 has the positive and negative electrode terminals 2 and 3 on the upper side. The battery cells 1 are stacked and pressurized, and are constrained so as not to extend in the stacking direction by high-stiffness metal restraining bands 4 and 5. However, the position of the battery cell 1 varies within a dimensional tolerance range. Therefore, the dimensional tolerance is absorbed by the flexible wiring portion 153 between the bus bar 151 and the lead frame 154 in the wiring center portion 152.

  In the first embodiment, as shown in FIG. 2, the bus bar 151, the flexible wiring portion 153, and the lead frame 154 in the wiring center portion 152 are formed as an integral metal wiring portion. And since the flexible wiring part 153 has the two bending parts 1531 and 1532 like FIG. 1, it is easy to move to the longitudinal direction (arrow Y1 direction) of the lead frame 154. FIG. For this reason, even if the mounting position of the bus bar 151 causes an error within the range of the dimensional tolerance, the flexible wiring portion 153 can easily absorb the error.

  Note that since the bus bar 151 is thick, the bus bar 151 may be manufactured by press-molding an independent material, and a material separate from the lead frame 154 and the flexible wiring portion 153 may be press-molded.

  A bus bar holding member 132 is attached to the circuit board fixing member 13. On the other hand, the circuit board fixing member 13 has a fixing portion center portion 131. As shown in FIG. 2, the fixed portion center portion 131 and the bus bar holding member 132 are connected by two connecting portions 1321 and 1322 made of synthetic resin formed in a wave shape. The wavy connecting portions 1321 and 1322 may be one place instead of two places. Moreover, it should just be flexible and does not need to be wavy.

  The connecting portions 1321 and 1322 make the bus bar holding member 132 easy to move in the longitudinal direction of the lead frame 154 (arrow Y1 direction). The circuit board fixing member 13 is provided with three thermistors 18, 19, and 20 to detect the temperature of each part in the battery stack 8.

  Note that both ends of the flexible wiring portion 153 have heat caulking portions 1535 and 1356 provided with holes for receiving resin pins and fixing the pins by heat caulking. The heat caulking portions 1535 and 1536 are provided. Is not a required configuration.

  In addition, the wiring portion 15 has a wiring center portion 152 in which a lead frame 154 forming a large number of copper wirings is attached to a synthetic resin plate, and each flexible wiring portion 153 is asymmetric on both the left and right sides from the wiring center portion 152. It extends alternately. Thereby, a voltage detection line can be pulled out from the electrode terminals 2 and 3 (for example, plus electrode terminal) of the same polarity of the adjacent battery cell 1. Therefore, the voltage between the battery cells 1 can be accurately monitored without being affected by the voltage drop in the bus bar 151 due to the current flowing through the bus bar 151, and deterioration of the battery cell 1 can be accurately detected. it can.

(Operational effects of the first embodiment)
In the said 1st Embodiment, the assembled battery which laminates | stacks many battery cells 1 and pressurizes and restrains the battery cell 1 in the lamination direction is comprised. The assembled battery includes a circuit board 14 that detects the voltage of the battery cell 1, a circuit board fixing member 13 that has rigidity to attach the circuit board 14 and extends in the stacking direction, and a wiring disposed on the circuit board fixing member 13. Part 15.

  The wiring part 15 is connected between the bus bar 151 juxtaposed in the stacking direction in order to connect the electrode terminals 2 and 3 of each battery cell 1, and between the bus bar 151 and the circuit board 14, and at least partially flexible. And a flexible wiring portion 153 that allows movement of the bus bar 151 in the stacking direction.

  According to this, since the flexible wiring portion 153 is provided between the bus bar 151 that is required to adjust the mounting position and the circuit board 14 that is required to determine the mounting position, Even if an error occurs in the mounting position, the error can be absorbed.

  The bus bar 151 is housed in a bus bar holding member 132 that surrounds the bus bar 151, and the bus bar holding member 132 and the circuit board fixing member 13 are connected by flexible connecting portions 1321 and 1322. ing. The bus bar holding member 132, the connecting portions 1321 and 1322, and the circuit board fixing member 13 are formed as an integral resin molded product.

  According to this, the bus bar holding member 132, the connecting portions 1321 and 1322, and the circuit board fixing member 13 can be molded as an integral resin molded product, which is easy to manufacture.

  Furthermore, the flexible wiring part 153 and the wiring center part 152 which becomes a wiring part between the flexible wiring part 153 and the circuit board 14 are continuously formed by an integral metal piece.

  According to this, the flexible wiring portion 153 and the lead frame 154 of the wiring center portion 152 are continuously formed by an integral metal piece, and there is no connection portion that becomes a seam, so that the manufacturing cost can be reduced. it can.

  In addition, the flexible wiring portion 153 is fixed to the circuit board fixing member 13 or the bus bar holding member 132 by heat caulking. According to this, since the flexible wiring part 153 is fixed by the heat caulking parts 1535 and 1536, it is easy to maintain the fixing strength of the flexible wiring part 153.

  Next, a smoke exhaust duct 12 is formed between the circuit board fixing member 13 and the plurality of battery cells 1 to release smoke when the battery cell 1 fails. According to this, when the battery cell 1 breaks down, it can pass through the smoke exhaust duct 12 and can escape smoke. Further, the circuit board fixing member 13 and the smoke exhaust duct 12 are arranged in contact with each other. According to this, the rigidity of the circuit board fixing member 13 can be increased by the smoke exhaust duct 12.

  Furthermore, a plurality of bus bar holding members 132 are formed side by side on both sides of the circuit board fixing member 13. According to this, by arranging the circuit board fixing member 13 at the center, the distance from the bus bar 151 to the circuit board 14 in the bus bar holding member 132 can be connected by the shortest path, and detection errors such as voltage can be reduced. . In addition, by arranging a plurality of bus bar holding members 132 on both sides, a large space required for the connection work between the battery cell 1 and the bus bar 151 can be secured, so the connection work of the bus bar 151 to the battery cell 1 is performed. Easy to do.

  In addition, the bus bar holding members 132 are arranged so as to alternately and asymmetrically extend on both sides of the circuit board fixing member 13 (this arrangement is referred to as a staggered pattern in this case). The flexible wiring portion 153 connected to the bus bar 151 is also connected in a staggered pattern, and the flexible wiring portion 153 is connected to the electrode terminals 2 and 3 of the same polarity of the battery cell 1.

  According to this, the flexible wiring part 153 which comprises a voltage detection line is connected to the electrode terminals 2 and 3 of the same polarity of the battery cell 1. Therefore, even when a large current flows through the bus bar 151 and a voltage drop that cannot be ignored occurs in the bus bar 151, it is possible to eliminate the influence of the voltage drop on the voltage detection. By the way, if the staggered arrangement is not used, one voltage detection does not include the voltage drop in the bus bar 151, and the other voltage detection includes the voltage drop of the two bus bars 151, which deteriorates the cell voltage detection accuracy. Connected.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof is omitted, and different configurations will be described. In addition, about 2nd Embodiment or less, the same code | symbol as 1st Embodiment shows the same structure, Comprising: The description which precedes is used. FIG. 3 shows an assembled battery constituting the second embodiment of the present invention. FIG. 4 is an enlarged view of the bus bar 151 and the flexible wiring portion 153 in the second embodiment.

  In the first embodiment, the bus bar 151, the flexible wiring portion 153, and the lead frame 154 are continuously formed from an integral metal portion. In the second embodiment, the lead frame 154 and the flexible wiring portion 153 are formed separately. Further, the pins 21 and 22 are integrally formed on a lead frame 154 that is insert-molded inside the fixing portion center portion 131 of the circuit board fixing member 13. A pin hole 1533 into which the pins 21 and 22 are inserted is formed in the flexible wiring portion 153. Then, the pins 21 and 22 and the pin hole 1533 are joined together by connecting them by soldering.

  The flexible wiring portion 153 and the bus bar 151 may be made of a continuous metal material, or may be made separately, and the flexible wiring portion 153 and the bus bar 151 may be soldered, crimped, and crimped. You may combine with either. The flexible wiring portion 153 is a flexible printed wiring (FPC) made of a copper piece having a flat cross section and a transparent synthetic resin on both sides, but may be formed of an insulated wire having a core wire with a round diameter of about 0.2 mm. Further, if the distance between the flexible wiring portions 153 is sufficient, the insulating portion may not be provided. FIG. 4 illustrates a state in which the flexible wiring portion 153 and the bus bar 151 are coupled by the crimping portion 151k.

  In FIG. 3, a wiring portion 15 is formed by a bus bar 151, a flexible wiring portion 153, and a lead frame 154. A part of the wiring portion 15 is insert-molded and embedded in the circuit board fixing member 13, and the pins 21 and 22 protrude from the surface and are exposed. The flexible wiring part 153 forms part of the voltage detection line.

  The bus bar 151 has two terminal coupling holes 1511 and 1512 to which the electrode terminals 2 and 3 of the adjacent battery cells 1 are connected. The electrode terminals 2 and 3 are inserted into the terminal coupling holes 1511 and 1512 and connected with nuts. Thereby, the some battery cell 1 is connected in series.

  The voltage of the bus bar 151 is guided to the circuit board 14 through the flexible wiring portion 153 and the lead frame 154 embedded in the fixed portion central portion 131. The circuit board 14 is housed in the board housing portion 133 of the circuit board fixing member 13 and is covered with the board cover 16. Further, a module cover 17 made of a transparent synthetic resin is placed above the wiring portion 15 to prevent an electric shock or the like.

  As described above, each of the battery cells 1 has the positive and negative electrode terminals 2 and 3 on the upper side. The battery cells 1 are stacked and pressurized, and are constrained so as not to extend in the stacking direction by high-stiffness metal restraining bands 4 and 5. However, an error occurs in the position of the battery cell 1 within the range of the dimensional tolerance. Therefore, an error within the dimensional tolerance is absorbed by the flexible wiring portion 153 between the bus bar 151 and the lead frame 154 embedded in the wiring center portion 152.

  A bus bar holding member 132 is attached to the circuit board fixing member 13. On the other hand, the circuit board fixing member 13 has a fixing portion center portion 131. The fixed portion central portion 131 and the bus bar holding member 132 are connected by two connecting portions made of synthetic resin formed in a wave shape as in the first embodiment (the connecting portions 1321 and 1322 similar to FIG. 2). ing. The connecting portions 1321 and 1322 may be provided at one place instead of two places. Moreover, it should just be flexible and does not need to be wavy.

  In addition, since it is the structure which attaches the pin hole 1533 of the flexible wiring part 153 to the metal pins 21 and 22 of FIG. 3 and absorbs the error (deviation) of a dimension, the flexible wiring part 153 is 1st. It may be less flexible than the embodiment.

  Similarly to the first embodiment, the connecting portions 1321 and 1322 make the bus bar holding member 132 easy to move in the longitudinal direction (arrow Y1 direction) of the lead frame 154. The circuit board fixing member 13 is provided with three thermistors 18, 19, and 20 to detect the temperature of each part in the battery stack 8.

  In the first embodiment, both ends of the flexible wiring portion 153 are provided with holes for receiving resin pins, and heat caulking portions 1535 and 1536 (which are fixed by heat caulking the resin pins are provided. 2). However, in the second embodiment, the heat caulking portions 1535 and 1536 are not necessary.

  Similarly to the first embodiment, the wiring portion 15 has a wiring center portion 152 in which a large number of copper lead frames are attached to a resin plate, and each flexible wiring portion 153 is connected to the wiring center portion 152. It extends in a staggered pattern on the left and right. Thereby, a voltage detection line can be pulled out from the electrode terminal (for example, plus electrode terminal) of the same polarity of the adjacent battery cell 1. Therefore, the voltage between the battery cells 1 can be accurately monitored without being affected by the voltage drop in the bus bar 151 due to the current flowing through the bus bar 151, and deterioration of the battery cell 1 can be accurately detected. it can.

(Modification of the second embodiment)
Next, a modification of the second embodiment of the present invention will be described. In the second embodiment, as shown in FIGS. 3 and 4, the lead frame 154 that is a part of the wiring portion 15 is insert-molded and embedded in the circuit board fixing member 13, and is disposed at the same position on the left and right. The pins 21 and 22 are exposed to the surface. A pin hole 1533 into which the pins 21 and 22 are inserted is formed in the flexible wiring portion 153, and the pins 21 and 22 and the pin hole 1533 are combined and then soldered to couple them. However, the pins 21 and 22 do not have to be in the same position on the left and right, and may be arranged in a staggered pattern.

  In FIG. 5 which shows the modification of 2nd Embodiment, metal pins 21 and 22 are arrange | positioned not in the left-right same position but in the staggered shape. Further, two heat caulking portions 1535a and 1535b reinforce around the pins 21 and 22. Further, the lead frame 154 and the flexible wiring portion 153 are formed separately, and the lead frame is insert-molded inside the fixing portion central portion 131 of the circuit board fixing member 13 as indicated by a broken line. 154.

  Pins 21 and 22 are integrally formed in the embedded lead frame 154, and a pin hole 1533 having an inner diameter into which the pins 21 and 22 can be inserted with a margin is formed in the flexible wiring portion 153. Then, the pins 21 and 22 and the pin hole 1533 are joined together by soldering after the connection.

  The flexible wiring portion 153 and the bus bar 151 may be made of a continuous metal material, or may be made separately, and the flexible wiring portion 153 and the bus bar 151 may be soldered, crimped, and crimped. You may combine with either.

  The flexible wiring portion 153 is a flexible printed wiring (FPC) made of a copper piece having a flat cross section and a transparent synthetic resin on both sides, but may be formed of an insulated wire having a core wire having a round diameter of about 0.2 mm. . Further, if the distance between the flexible wiring portions 153 is sufficient, the insulating portion may not be provided.

  The bus bar 151 has two terminal coupling holes 1511 and 1512 to which the electrode terminals 2 and 3 of the adjacent battery cells 1 are connected. The electrode terminals 2 and 3 are inserted into the terminal coupling holes 1511 and 1512 and tightened with nuts. Thereby, the some battery cell 1 is connected in series. The voltage of the bus bar 151 is guided to the circuit board 14 via the flexible wiring portion 153 and the lead frame 154 embedded in the fixed portion center portion 131. The circuit board 14 is housed in the board housing portion 133 of the circuit board fixing member 13.

  5 has a wiring center portion 152 in which a large number of copper lead frames are attached to a resin plate, and each flexible wiring portion 153 has a zigzag pattern on the left and right sides of the wiring center portion 152. It is extended. Thereby, a voltage detection line can be pulled out from the electrode terminal (for example, plus electrode terminal) of the same polarity of the adjacent battery cell 1. Therefore, the voltage between the battery cells 1 can be accurately monitored without being affected by the voltage drop in the bus bar 151 due to the current flowing through the bus bar 151, and deterioration of the battery cell 1 can be accurately detected. it can.

(Operational effect of the second embodiment)
In the said 2nd Embodiment, the assembled battery which laminates | stacks many battery cells 1 and pressurizes and restrains the battery cell 1 in the lamination direction is comprised. The assembled battery includes a circuit board 14 that detects the voltage of the battery cell 1, a circuit board fixing member 13 that has rigidity to attach the circuit board 14 and extends in the stacking direction, and a wiring disposed on the circuit board fixing member 13. Part 15.

  The wiring part 15 is connected between the bus bar 151 juxtaposed in the stacking direction in order to connect the electrode terminals 2 and 3 of each battery cell 1, and between the bus bar 151 and the circuit board 14, and at least partially flexible. And a flexible wiring portion 153 that allows movement of the bus bar 151 in the stacking direction.

  According to this, since the flexible wiring portion 153 is provided between the bus bar 151 that is required to adjust the mounting position and the circuit board 14 that is required to determine the mounting position, Even if an error occurs in the mounting position, the error can be absorbed.

  The bus bar 151 is housed in a bus bar holding member 132 that surrounds the bus bar 151, and the bus bar holding member 132 and the circuit board fixing member 13 are connected by flexible connecting portions 1321 and 1322. Yes. The bus bar holding member 132, the connecting portions 1321 and 1322, and the circuit board fixing member 13 are formed as an integral resin molded product. According to this, since the bus-bar holding member 132, the connection parts 1321 and 1322, and the circuit board fixing member 13 can be integrally molded, it is easy to manufacture.

  In addition, the wiring part 15 is arranged in the resin member constituting the circuit board fixing member 13 by insert molding. According to this, since the lead frame 154 of the wiring portion 15 is insert-molded inside the resin member, the lead frame 154 can be firmly integrated with the circuit board fixing member 13.

(Third embodiment)
Next, a third embodiment of the present invention will be described. A different part from embodiment mentioned above is demonstrated. FIG. 6 shows the flexible wiring portion 153 and the bus bar holding member 132 in the third embodiment of the present invention. In FIG. 6, the circuit board fixing member 13 is made of a resin member, and the wiring portion 15 is arranged and fixed on the resin member.

  The circuit board fixing member 13 is provided with a bowl-shaped bus bar holding member 132 that houses a copper bus bar 151 having a thickness of about 1 mm. The plurality of bus bars 151 and the plurality of bus bar holding members 132 are juxtaposed in the stacking direction in order to connect the electrode terminals of the battery cell 1.

  A wiring portion 15 formed as a flexible printed wiring (FPC) is placed on the circuit board fixing member 13. The wiring part 15 has a wiring center part 152 in which a lead frame 154 forming a large number of thin copper wirings is sandwiched between transparent resin plates. Although the wiring center portion 152 is formed as a flexible printed wiring, a ribbon electric wire in which a large number of wirings are bundled may be used. The lead frame 154 in the wiring portion 15 made of flexible printed wiring is connected to a metal bus bar 151 via a flexible wiring portion 153 that is a part of the wiring portion 15.

  In the flexible wiring portion 153 of the third embodiment, the lead frame 154 is extended as it is to form a wavy bent portion. That is, the lead frame 154 is bent into a wave shape so as to be flexible, and is directly fixed to the bus bar 151 by soldering, caulking, or crimping.

  The flexible wiring part 153 forms part of the voltage detection line. The bus bar 151 has two terminal coupling holes 1511 and 1512 to which the electrode terminals 2 and 3 of the adjacent battery cells 1 are connected. The electrode terminals 2 and 3 of the battery cell 1 are inserted into the terminal coupling holes 1511 and 1512 to be connected. Thereby, the some battery cell 1 is connected in series. The voltage of the bus bar 151 is guided to the circuit board 14 (not shown in FIG. 6) via the flexible wiring portion 153 and the lead frame 154 in the wiring center portion 152.

  As described above, each of the battery cells 1 has the positive and negative electrode terminals 2 and 3 on the upper side. The battery cells 1 are stacked and pressurized, and are constrained so as not to extend in the stacking direction by high-stiffness metal restraining bands 4 and 5. However, the position of the battery cell 1 varies within a dimensional tolerance range. Therefore, the dimensional tolerance is absorbed by the flexible wiring portion 153 bent in a wave shape between the bus bar 151 and the lead frame 154 in the wiring center portion 152.

  The circuit board fixing member 13 has a fixing portion center portion 131. The fixed portion central portion 131 and the bus bar holding member 132 are connected by connecting portions 1321 and 1322 made of synthetic resin formed in a wave shape. The connecting portions 1321 and 1322 may be provided at one place instead of two places. Moreover, it should just be flexible and does not need to be wavy.

(Operational effect of the third embodiment)
In the third embodiment, the bus bar 151 is housed in the bus bar holding member 132 that surrounds the bus bar 151. The bus bar holding member 132 and the circuit board fixing member 13 are connected by flexible connecting parts 1321 and 1322, and the bus bar holding member 132, the connecting parts 1321 and 1322, and the circuit board fixing member are connected. 13 is formed as an integral resin molded product. According to this, the bus bar holding member 132, the connecting portions 1321 and 1322, and the circuit board fixing member 13 can be manufactured with the same resin mold.

  Further, the flexible wiring portion 153 and the lead frame 154 of the wiring center portion 152 are continuously formed by an integral metal piece. The flexible wiring portion 153 is formed to be bent in a wave shape.

  According to this, since the flexible wiring part 153 and the wiring center part 152 are continuously formed by an integral metal piece and there is no connection part that becomes a joint, the manufacturing cost can be reduced. In addition, the flexible wiring portion 153 is formed to be bent in a wave shape, so that the flexibility can be enhanced and the possibility of disconnection is small.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described. A different part from embodiment mentioned above is demonstrated. FIG. 7 shows a circuit board fixing member 13 according to the fourth embodiment of the present invention. In the first embodiment, the smoke exhaust duct 12 and the circuit board fixing member 13 are separated from each other although they are the same synthetic resin molded product. In the fourth embodiment, as shown in FIG. And the circuit board fixing member 13 are integrated.

  In the fourth embodiment, a smoke exhaust duct 12 that releases smoke when the battery cell 1 fails is integrally formed between the circuit board fixing member 13 and the plurality of battery cells 1. According to this, when the battery cell 1 breaks down, it can pass through the smoke exhaust duct 12 and can escape smoke.

  Further, the circuit board fixing member 13 and the smoke exhaust duct 12 are made of an integral resin molded product. Therefore, the molds can be unified and the number of parts can be reduced.

(Other embodiments)
In the above-described embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. It is. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  Although the wiring part 15 of 1st Embodiment comprised the flexible printed circuit board (FPC) with the whole soft and mounted this on the hard circuit board fixing member 13, as long as wiring was integrated, many may be sufficient. The wiring part 15 which bundled the electric wire may be sufficient. Further, it may be a ribbon electric wire (also referred to as a ribbon cable) in which a required number of single-core heat-resistant vinyl wires are arranged and bonded in a ribbon shape.

  Each flexible wiring portion 153 extends in a zigzag pattern from the wiring center portion 152 to the left and right, and draws a voltage detection line from an electrode terminal (for example, a positive electrode terminal) of the same polarity of the adjacent battery cell 1. I was able to. However, when it is not necessary to monitor the voltage between the battery cells 1 so accurately, the flexible wiring portions 153 do not need to be arranged in a staggered pattern on the left and right from the wiring center portion 152. Each flexible wiring portion 153 is provided on both the left and right sides of the wiring center portion 152. It may be provided on one side.

  Next, in the second embodiment, the wiring part 15 is formed by being insert-molded and embedded in the circuit board fixing member 13, but a part of the wiring part 15 is exposed on the surface of the circuit board fixing member 13 without being completely embedded. May be. Then, the conductive pins 21 and 22 may protrude from the exposed wiring portion 15.

  Further, the circuit board fixing member 13 has the circuit board 14 attached to the end, but the circuit board 14 may be provided in the center of the circuit board fixing member 13. Moreover, although the width of the circuit board fixing member 13 is smaller than the width of the circuit board 14, it may be the same width or a larger width.

2, 3 Electrode terminal 12 Smoke exhaust duct 13 Circuit board fixing member 14 Circuit board 15 Wiring part 132 Bus bar holding member 151 Bus bar 152 Wiring center part 153 Flexible wiring part 1321, 1322 Connection part

Claims (8)

  1. An assembled battery that stacks a plurality of battery cells (1) and pressurizes and restrains the battery cells (1) in the stacking direction,
    A circuit board (14) for detecting the voltage of the battery cell (1);
    A circuit board fixing member (13) extending in the stacking direction and attaching the circuit board (14);
    A wiring portion (15) disposed on the circuit board fixing member (13),
    The wiring portion (15) includes a plurality of bus bars (151) juxtaposed in the stacking direction to connect the electrode terminals (2, 3) of each battery cell (1), and the bus bars (151). said circuit board (14) a flexible wiring unit (153) to permit movement of the stacking direction of said bus bar to a portion connecting flexible at least in part (151) and a Nde containing And
    Furthermore, a bus bar holding member (132) that surrounds and stores the bus bar (151), and a flexible connecting portion (1321) that connects the bus bar holding member (132) and the circuit board fixing member (13). 1322), and
    The bus bar holding member (132), the connecting portions (1321, 1322), and the circuit board fixing member (13) are formed as an integral resin molded product,
    The flexible wiring portion (153) has a hole portion (15, 22) provided integrally with a wiring portion connecting the flexible wiring portion (153) and the circuit board (14). 1533)
    The pins (21, 22) are coupled to the flexible wiring portion (153) so as to be energized in a state of being fitted in the hole portion (1533),
    The connecting portion (1321 and 1322), the flexible wiring portion (153), characterized that you connecting the said busbars holding member (132) a circuit board fixing member (13) as a separate member apart from The assembled battery.
  2. The assembled battery according to claim 1, wherein the connecting portions (1321, 1322) are provided on both sides of the flexible wiring portion (153) in the stacking direction .
  3. A smoke exhaust duct (12) is provided between the circuit board fixing member (13) and the plurality of battery cells (1) to release smoke generated when the battery cell (1) fails. The assembled battery according to claim 1 or 2.
  4. The assembled battery according to claim 3 , wherein the circuit board fixing member (13) and the smoke exhaust duct (12) are arranged in contact with each other .
  5. The assembled battery according to claim 4 , wherein the circuit board fixing member (13) and the smoke exhaust duct (12) are formed of an integral resin molded product .
  6. The circuit board fixing member (13) is a member made of resin, we claim 1, wherein the wiring portion in the interior of the circuit board fixing member (13) (15) is disposed by insert molding The assembled battery according to any one of 5 .
  7. The assembled battery according to any one of claims 1 to 6 , wherein a plurality of the bus bar holding members (132) are formed side by side on both sides of the circuit board fixing member (13) .
  8. The bus bar holding members (132) are alternately arranged asymmetrically on both the left and right sides with the circuit board fixing member (13) in between, and the flexible wiring portion (153) connected to the bus bar (151) is also included. The left and right sides are asymmetrically connected to each other,
    The assembled battery according to claim 7 , wherein the flexible wiring portion (153) is connected to the electrode terminals (2, 3) having the same polarity .
JP2013151916A 2013-07-22 2013-07-22 Assembled battery Active JP6136697B2 (en)

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JP6016737B2 (en) * 2013-08-29 2016-10-26 古河電気工業株式会社 In-battery wiring module of battery pack
DE102014213275A1 (en) * 2014-07-09 2016-01-14 Robert Bosch Gmbh Carrier assembly for carrying and holding components for battery cells of a battery module, in particular for an electric vehicle
JP6401656B2 (en) * 2015-04-21 2018-10-10 株式会社オートネットワーク技術研究所 Wiring member
CN107534121B (en) * 2015-04-27 2020-05-12 住友电气工业株式会社 Battery wiring module and power supply device provided with same
CN106299223B (en) * 2015-05-25 2019-08-30 宁德时代新能源科技股份有限公司 Battery modules
JP6508070B2 (en) * 2016-01-19 2019-05-08 株式会社オートネットワーク技術研究所 Wiring module and storage module
JP6535309B2 (en) 2016-09-26 2019-06-26 矢崎総業株式会社 Battery monitoring unit
EP3346523B1 (en) * 2017-01-06 2019-03-27 Samsung SDI Co., Ltd. Battery system with a cell connecting unit
CN107146862B (en) * 2017-05-09 2020-05-22 深圳市宝尔爱迪科技有限公司 Large-voltage explosion-proof battery pack and manufacturing method thereof
JP2019021500A (en) * 2017-07-18 2019-02-07 矢崎総業株式会社 Battery module and battery monitoring unit mounting structure
EP3595033A1 (en) * 2018-07-10 2020-01-15 Yazaki Corporation Bus bar module
JP2020087665A (en) * 2018-11-22 2020-06-04 株式会社オートネットワーク技術研究所 Connection module

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WO2012011237A1 (en) * 2010-07-23 2012-01-26 三洋電機株式会社 Battery module, battery system, electric vehicle, mobile body, power storage device, and power source device
JP5606872B2 (en) * 2010-08-20 2014-10-15 愛三工業株式会社 Battery module
JP5826637B2 (en) * 2012-01-11 2015-12-02 愛三工業株式会社 Battery module
JP2013143281A (en) * 2012-01-11 2013-07-22 Auto Network Gijutsu Kenkyusho:Kk Wiring module for battery
JP2014220148A (en) * 2013-05-09 2014-11-20 愛三工業株式会社 Bus bar module

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