JP7081355B2 - Monitoring device - Google Patents

Description

The disclosure of this specification relates to a battery cell monitoring device.

As shown in Patent Document 1, a battery wiring module that detects the voltage of a plurality of cell cells is known. This battery wiring module has a bus bar for connecting electrode terminals between different cells and a flexible substrate including a voltage detection line connected to the bus bar.

Japanese Unexamined Patent Publication No. 2017-27831

In the battery wiring module described in Patent Document 1, a plurality of connection lands are formed at one end of a plurality of voltage detection lines. These plurality of connecting lands are lined up along one edge of the flexible substrate. A bus bar is connected to this connection land.

By the way, when the arrangement of a plurality of cells or the cells themselves are changed, the relative positions of the bus bar and the connection land are displaced. In order to eliminate this deviation, it is necessary to change the design of the flexible substrate on which the connection land is formed. As described above, the battery wiring module (monitoring device) described in Patent Document 1 has a configuration having low versatility with respect to a design change of a plurality of single batteries (battery stacks) to be connected.

Therefore, it is an object of the disclosure of the present specification to provide a highly versatile monitoring device for a design change of a battery stack.

One of the disclosures is that a plurality of battery cells (220) formed on the formed surface (220a) in such a manner that the positive electrode terminal (221) and the negative electrode terminal (222) are separated from each other are along the formed surface and the positive electrode terminal and the negative electrode terminal are separated from each other. The first electrode terminal group (211) in which the positive electrode terminal and the negative electrode terminal are alternately arranged in a predetermined direction by arranging in a predetermined direction intersecting the separated directions, and the first electrode terminal group are the positive electrode terminal and the negative electrode terminal. A second electrode terminal group (212) in which the arrangement is reversed, and a connecting terminal (223, 223a to 223h, 224, 224a, 224b) connected to at least one of a positive electrode terminal and a negative electrode terminal. A monitoring device (100) connected to the stack (210).
A monitoring unit (10) that monitors the voltage of the battery cell,
It has a wiring unit (30) that connects the connection terminal and the monitoring unit.
The wiring part is
A flexible substrate (35) provided between the first electrode terminal group and the second electrode terminal group in a manner facing the forming surface of a plurality of battery cells.
A plurality of protrusions (36) extending from the flexible substrate, and
It has a flexible substrate and a wiring pattern (34) formed on each of the protrusions.
By bending at least one of the plurality of protrusions and extending them in a predetermined direction and a separation direction, the wiring pattern formed on the protrusions is connected to the connecting terminal.
The protrusion is formed with a notch (36b) that locally narrows the width in the direction intersecting the direction extending from the flexible substrate of the protrusion.

As described above, in the present disclosure, the extension direction of the protrusion (36) on which the wiring pattern (34) is formed is changed to a predetermined direction and a separation direction by bending. Therefore, even if the relative positions of the connecting terminals (223, 223a to 223h, 224, 224a, 224b) and the protrusion (36) are displaced due to the design change of the battery stack (210), the protrusion (36) ) Can be connected to the connection terminals (223, 223a to 223h, 224, 224a, 224b). The monitoring device (100) is highly versatile for design changes of the battery stack (210).

It should be noted that the reference numbers in parentheses above merely indicate the correspondence with the configurations described in the embodiments described later, and do not limit the technical scope at all.

It is a circuit diagram of a battery pack. It is a top view which shows the battery stack. It is a top view which shows the front wiring part and the back wiring part. It is a top view which shows the monitoring apparatus which concerns on 1st Embodiment. It is a top view which shows the state which the monitoring device is arranged in the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a figure which shows the detailed structure of the protrusion. It is a figure which shows the fixed form of the bent state of a protrusion. It is a top view which shows the connection structure of a monitoring device and a battery stack when the body shape of a battery cell is increased. It is a top view which shows the connection structure of a monitoring device and a battery stack when the body shape of a battery cell is reduced. It is a top view which shows the connection structure of a monitoring device and a battery stack when the number of battery cells is increased by one. It is a top view which shows the connection structure of a monitoring device and a battery stack when the number of battery cells is increased by two. It is a top view which shows the monitoring device which folded a part of the back wiring part. It is a top view which shows the monitoring apparatus which concerns on 2nd Embodiment. It is a top view which shows the state which the monitoring device is arranged in the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the connection structure of a monitoring device and a battery stack when the number of battery cells is increased by one. It is a top view which shows the connection structure of a monitoring device and a battery stack when the number of battery cells is increased by two. It is a top view which shows the monitoring apparatus which concerns on 3rd Embodiment. It is a top view which shows the state which the monitoring device is arranged in the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the modification of the monitoring apparatus. It is a top view which shows the monitoring apparatus which concerns on 4th Embodiment. It is a top view which shows the state which the monitoring device is arranged in the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the modification of the monitoring apparatus. It is a top view which shows the battery stack in 5th Embodiment. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack. It is a top view which shows the state which the monitoring device is connected to the battery stack.

Hereinafter, embodiments will be described with reference to the drawings.

(First Embodiment)
The battery pack monitoring device according to the present embodiment will be described with reference to FIGS. 1 to 14. In this embodiment, an example in which the battery pack is applied to a hybrid vehicle will be described.

<Overview of battery pack>
The battery pack 400 functions to supply electric power to the electric load of the hybrid vehicle. This electrical load includes a motor generator that acts as a power source and power source. For example, when this motor generator powers up, the battery pack 400 discharges and supplies power to the motor generator. When the motor generator generates power, the battery pack 400 charges the generated power generated by the power generation.

The battery pack 400 has a battery ECU 300. The battery ECU 300 is electrically connected to various ECUs (vehicle-mounted ECUs) mounted on the hybrid vehicle. The battery ECU 300 and the vehicle-mounted ECU send and receive signals to each other to coordinately control the hybrid vehicle. By this coordinated control, the power generation and power running of the motor generator according to the charge amount of the battery pack 400, the output of the internal combustion engine, and the like are controlled.

The ECU is an abbreviation for electronic control unit. The ECU has at least one arithmetic processing unit (CPU) and at least one memory device (MMR) as a storage medium for storing programs and data. The ECU is provided by a microcomputer equipped with a computer-readable storage medium. A storage medium is a non-transitional substantive storage medium that stores a computer-readable program non-temporarily. The storage medium may be provided by a semiconductor memory, a magnetic disk, or the like.

The battery pack 400 has a battery module 200. As shown in FIG. 2, the battery module 200 has a battery stack 210 in which a plurality of battery cells 220 are electrically and mechanically connected in series.

The battery pack 400 has a monitoring device 100. The monitoring device 100 detects the voltage of each battery cell 220 constituting the battery stack 210. The monitoring device 100 outputs the monitoring result to the battery ECU 300. The battery ECU 300 determines the equalization of SOCs of each of the plurality of battery cells 220 based on the monitoring result of the monitoring device 100. Then, the battery ECU 300 outputs an instruction for equalization processing based on the determination to the monitoring device 100. The monitoring device 100 performs equalization processing for equalizing the SOCs of the plurality of battery cells 220 according to the instructions input from the battery ECU 300. SOC is an abbreviation for state of charge.

As shown above, the battery pack 400 includes a monitoring device 100, a battery module 200, and a battery ECU 300. Although not shown, the battery pack 400 also has a blower fan for cooling the battery module 200. The drive of this blower fan is controlled by the battery ECU 300.

The battery pack 400 is provided in, for example, an arrangement space under a seat of a hybrid vehicle. Generally, the area under the back seat is wider than the area under the front seat. Therefore, the battery pack 400 of the present embodiment is provided in the arrangement space under the rear seat. However, the installation location of the battery pack 400 is not limited to this. For example, the battery pack 400 can be installed between the rear seat and the trunk room, between the driver's seat and the passenger seat, and the like.

Next, the battery module 200 and the monitoring device 100 will be described. In the following, the three directions orthogonal to each other are referred to as a horizontal direction, a vertical direction, and a height direction. In the present embodiment, the lateral direction is along the advancing / retreating direction of the hybrid vehicle. The vertical direction is along the left-right direction of the hybrid vehicle. The height direction is along the top and bottom direction of the hybrid vehicle.

<Overview of battery module>
As described above, the battery module 200 has a battery stack 210. Further, the battery module 200 has a battery case (not shown) for accommodating the battery stack 210. This battery case has a housing and a lid. The housing is made of die-cast aluminum. The housing can also be manufactured by pressing iron or stainless steel. The lid is made of a resin material or a metal material.

The housing has a box shape that opens in the height direction and has a bottom. The opening of the housing is covered by a lid. The housing and the lid form a storage space for accommodating the battery stack 210 and the monitoring device 100. A distribution channel through which wind flows is configured in the storage space. At least one of the housing and the lid is configured with a communication hole for communicating the external atmosphere and the distribution channel.

The battery stack 210 has a plurality of battery cells 220. These plurality of battery cells 220 are arranged in the vertical direction. The plurality of battery cells 220 are electrically and mechanically connected in series. Therefore, the output voltage of the battery module 200 is the sum of the output voltages of the plurality of battery cells 220.

<Overview of monitoring equipment>
As shown in FIG. 1, the monitoring device 100 has a monitoring unit 10 that monitors the voltage of each of the plurality of battery cells 220, and a wiring unit 30 that electrically connects the monitoring unit 10 and each of the plurality of battery cells 220. ..

The monitoring unit 10 is provided in the battery module 200 in a manner aligned with the battery stack 210 in the vertical direction or the height direction. The wiring portion 30 is provided in the battery module 200 so as to be aligned with the battery stack 210 in the height direction.

<Battery stack configuration>
As described above, the battery stack 210 has a plurality of battery cells 220. As shown in FIG. 2, the battery cell 220 has a quadrangular prism shape. The battery cell 220 has six sides.

The battery cell 220 has an upper end surface 220a facing in the height direction. Although not shown, the battery cell 220 has a lower end surface facing in the height direction and aligned with the upper end surface 220a in the height direction. The battery cell 220 has a first side surface 220c and a second side surface 220d facing laterally. The battery cell 220 has a first main surface 220e and a second main surface 220f facing in the vertical direction. Of these six surfaces, the first main surface 220e and the second main surface 220f have a larger area than the other four surfaces.

The length of the battery cell 220 in the vertical direction is shorter than the length in the height direction and the horizontal direction. Therefore, the battery cell 220 has a flat plate shape having a short length in the vertical direction. The plurality of battery cells 220 are arranged in this vertical direction.

The battery cell 220 is a secondary battery. Specifically, the battery cell 220 is a lithium ion secondary battery. Lithium-ion secondary batteries generate electromotive voltage through a chemical reaction. A current flows through the battery cell 220 due to the generation of the electromotive voltage. As a result, the battery cell 220 generates gas. The battery cell 220 expands. The battery cell 220 is not limited to the lithium ion secondary battery. For example, as the battery cell 220, a nickel-metal hydride secondary battery, an organic radical battery, or the like can be adopted.

As described above, the first main surface 220e and the second main surface 220f of the battery cell 220 have a larger area than the other four surfaces. Therefore, in the battery cell 220, the first main surface 220e and the second main surface 220f are likely to expand. As a result, the battery cell 220 expands in the vertical direction. That is, the battery cell 220 expands in the direction in which the plurality of battery cells 220 are lined up.

The battery stack 210 has a restraint (not shown). By this restraint, the plurality of battery cells 220 are mechanically connected in series in the vertical direction. Further, this restraint suppresses the increase in the physique of the battery stack 210 due to the expansion of each of the plurality of battery cells 220. A gap is formed between the adjacent battery cells 220. The passage of air through this gap promotes heat dissipation from each battery cell 220.

A positive electrode terminal 221 and a negative electrode terminal 222 are formed on the upper end surface 220a of the battery cell 220. The positive electrode terminal 221 and the negative electrode terminal 222 are arranged side by side so as to be separated from each other in the lateral direction. The positive electrode terminal 221 is located on the first side surface 220c side. The negative electrode terminal 222 is located on the second side surface 220d side. The upper end surface 220a corresponds to the forming surface. The lateral direction corresponds to the separation direction.

As shown in FIG. 2, two battery cells 220 arranged adjacent to each other face each other with the first main surface 220e facing each other and the second main surface 220f facing each other. The upper end surfaces 220a of the two battery cells 220 arranged adjacent to each other are arranged in the vertical direction. As a result, one positive electrode terminal 221 and the other negative electrode terminal 222 of the two battery cells 220 arranged adjacent to each other are vertically arranged. As a result, in the battery stack 210, the positive electrode terminals 221 and the negative electrode terminals 222 are alternately arranged in the vertical direction. The vertical direction corresponds to a predetermined direction.

In the battery stack 210, the first electrode terminal group 211 in which the negative electrode terminals 222 and the positive electrode terminals 221 are alternately arranged in the vertical direction, and the second electrode terminal group 212 in which the positive electrode terminals 221 and the negative electrode terminals 222 are alternately arranged in the vertical direction. , Is configured. The arrangement of the positive electrode terminal 221 and the negative electrode terminal 222 is opposite between the first electrode terminal group 211 and the second electrode terminal group 212. The first electrode terminal group 211 and the second electrode terminal group 212 are lined up laterally apart from each other.

Of the electrode terminals constituting the first electrode terminal group 211 and the second electrode terminal group 212 described above, one positive electrode terminal 221 and one negative electrode terminal 222 that are adjacent to each other in the vertical direction are mechanically arranged via a series terminal 223. Targeted and electrically connected. As a result, a plurality of battery cells 220 constituting the battery stack 210 are electrically connected in series.

The battery stack 210 of this embodiment has nine battery cells 220. These nine battery cells 220 are connected in series. Therefore, the total number of positive electrode terminals 221 and negative electrode terminals 222 is 18. As shown in FIGS. 1 and 2, these 18 electrode terminals are assigned a number (No) whose number increases from the lowest potential to the highest potential.

As shown in FIG. 2, No. 1 positive electrode terminal 221 and No. The negative electrode terminals 222 of 2 are arranged adjacent to each other in the vertical direction. The positive electrode terminals 221 and the negative electrode terminals 222 that are adjacent to each other in the lateral direction are connected via the series terminal 223.

In the same manner as this, in the first electrode terminal group 211, No. 1 and No. No. 2 electrode terminal, No. 5 and No. No. 6 electrode terminal, No. 9 and No. No. 10 electrode terminal, No. 13 and No. The electrode terminals of 14 are connected via the series terminal 223. In the second electrode terminal group 212, No. 3 and No. No. 4 electrode terminal, No. 7 and No. No. 8 electrode terminal, No. 11 and No. 12 electrode terminals, No. 15 and No. The 16 electrode terminals are connected via the series terminal 223. In this way, the nine battery cells 220 are connected in series via a total of eight series terminals 223.

According to the connection configuration shown above, No. The negative electrode terminal 222 of 0 has the lowest potential. No. The positive electrode terminal 221 of 17 has the maximum potential. No. The positive electrode terminal 221 of 17 has a potential that is the sum of the outputs of the battery cells 220.

The output terminal 224 is connected to the negative electrode terminal 222 having the lowest potential and the positive electrode terminal 221 having the highest potential. The two output terminals 224 are electrically connected to the electrical load. As a result, the potential difference between the lowest potential and the highest potential is output to the electric load as the output voltage of the battery module 200. The series terminal 223 and the output terminal 224 correspond to the connecting terminal.

<Circuit configuration of monitoring device>
Next, the circuit configuration of the monitoring device 100 will be described with reference to FIGS. 1 and 6.

As shown in FIG. 1, the monitoring unit 10 includes a wiring board 11, a first electronic element 12, and a monitoring IC chip 13. The first electronic element 12 and the monitoring IC chip 13 are mounted on the wiring board 11. The first electronic element 12 and the monitoring IC chip 13 are electrically connected to each other via the board wiring 14 of the wiring board 11.

The wiring portion 30 is connected to the wiring board 11. The monitoring unit 10 and the battery stack 210 are electrically connected via the wiring unit 30.

The wiring board 11 is provided with a connector (not shown). The wire 301 shown in FIG. 1 is connected to this connector. The monitoring unit 10 and the battery ECU 300 are electrically connected via the wire 301.

The wiring unit 30 has a front wiring unit 31 and a back wiring unit 32. Each of the front wiring portion 31 and the back wiring portion 32 has a flexible substrate 33 having flexibility, and a plurality of wiring patterns 34 formed on the flexible substrate 33.

The plurality of wiring patterns 34 are connected to the series terminal 223 and the output terminal 224. A plurality of board wirings 14 corresponding to each of the plurality of wiring patterns 34 are formed on the wiring board 11. The plurality of wiring patterns 34 and the plurality of board wirings 14 are electrically connected.

In the following, for the sake of simplicity, the wiring patterns 34 and the board wiring 14 electrically connected to each other are collectively referred to as voltage detection wiring.

As shown in FIG. 1, a second electronic element 60 is mounted on the flexible substrate 33. The second electronic element 60 has a fuse 61 and an inductor 62. Further, the monitoring unit 10 has a Zener diode 15, a parallel capacitor 16, and a resistor 17 as the first electronic element 12. Each of the Zener diode 15, the parallel capacitor 16, and the resistor 17 is mounted on the wiring board 11.

As shown in FIG. 1, a fuse 61, an inductor 62, and a resistor 17 are provided for each of the plurality of voltage detection lines. A fuse 61, an inductor 62, and a resistor 17 are connected in series from the battery cell 220 to the monitoring IC chip 13.

The Zener diode 15 and the parallel capacitor 16 are each connected in parallel between two voltage detection lines arranged in the order of potential. Specifically, a Zener diode 15 and a parallel capacitor 16 are connected between the inductor 62 and the resistor 17 in the voltage detection line. The anode electrode of the Zener diode 15 is connected to the low potential side of the two adjacent voltage detection lines. The cathode electrode of the Zener diode 15 is connected to the high potential side of the two adjacent voltage detection lines.

With the connection configuration shown above, the RC circuit is configured by the resistor 17 and the parallel capacitor 16. The RC circuit and the inductor 62 function as a filter for removing noise at the time of voltage detection.

The Zener diode 15 has a structure in which a short-circuit failure (short-circuit failure) occurs when an overvoltage is applied from the battery module 200. Specifically, the Zener diode 15 has a structure in which a PN junction type IC chip is directly sandwiched by a pair of leads. As a result, unlike the configuration in which the IC chip and the lead are indirectly connected via a wire, for example, the Zener diode 15 is prevented from opening failure due to the breakage of the wire due to the application of an overvoltage.

The fuse 61 is configured to be blown by a large current flowing through the voltage detection wiring when the Zener diode 15 is short-circuited due to an overvoltage. The rated current of the fuse 61 is set based on the large current flowing through the voltage detection wiring when the Zener diode 15 is short-circuited due to an overvoltage. A large current is suppressed from flowing through the monitoring IC chip 13 due to the blown fuse 61.

As shown in FIG. 1, the monitoring IC chip 13 includes a driver 18 that performs signal processing such as amplification, and a switch 19 that corresponds to each of the plurality of battery cells 220. This switch 19 controls the electrical connection between two voltage detection lines arranged in the order of potential. One end of the switch 19 is connected to the wiring of the monitoring IC chip 13 connected to one of the two voltage detection lines arranged in the order of potential. The other end of the switch 19 is connected to the wiring of the monitoring IC chip 13 connected to the other of the two voltage detection lines arranged in the order of potential. The open / close control of the switch 19 controls the charging / discharging of the battery cell 220 electrically connected to the two voltage detection lines connected to the switch 19.

Further, the monitoring IC chip 13 has a comparator 20 for detecting the voltage of each of the plurality of battery cells 220. Two voltage detection lines arranged in order of potential are connected to the inverting input terminal and the non-inverting input terminal of the comparator 20. As a result, the positive electrode terminal 221 and the negative electrode terminal 222 of one battery cell 220 are connected to the inverting input terminal and the non-inverting input terminal of the comparator 20. The output terminal of the comparator 20 is connected to the wiring of the monitoring IC chip 13. The output of the comparator 20 is output to the battery ECU 300 as a differential amplification of the output voltage (electromotive voltage) of one battery cell 220.

The input impedance of the comparator 20 is higher than the output impedance. Therefore, the current flowing from the battery cell 220 to the comparator 20 is very small. The current flowing from the battery cell 220 to the comparator 20 is smaller than the current flowing through the battery stack 210 connected in series with the plurality of battery cells 220. The comparator 20 corresponds to a voltage detection circuit.

There is a correlation between the state of charge (SOC) of the battery cell 220 and the electromotive voltage. The battery ECU 300 stores this correlation. The battery ECU 300 detects the SOC of each of the plurality of battery cells 220 based on the stored correlation with the output voltage (electromotive voltage) input from the monitoring IC chip 13.

The battery ECU 300 determines the SOC equalization processing of the plurality of battery cells 220 based on the detected SOC. Then, the battery ECU 300 outputs an instruction for equalization processing based on the determination to the driver 18 of the monitoring IC chip 13. The driver 18 controls the opening / closing of the switch 19 corresponding to each of the plurality of battery cells 220 according to the instruction of the equalization process. As a result, the plurality of battery cells 220 are charged and discharged. The SOCs of the plurality of battery cells 220 are equalized.

The battery ECU 300 also detects the charge state of the battery stack 210 based on the input voltage and the like. The battery ECU 300 outputs the detected charge state of the battery stack 210 to the vehicle-mounted ECU. The in-vehicle ECU outputs a command signal to the battery ECU 300 based on the charging state, vehicle information such as the amount of depression of the accelerator pedal and the throttle valve opening degree input from various sensors mounted on the vehicle, and the ignition switch. The battery ECU 300 controls the connection between the battery stack 210 and the electric load based on this command signal.

Although not shown, a system main relay is provided between the battery stack 210 and the electrical load. This system main relay controls the electrical connection between the battery stack 210 and the electrical load by the generation of a magnetic field. The battery ECU 300 controls the connection between the battery stack 210 and the electric load by controlling the generation of the magnetic field of the system main relay.

<Terminal configuration>
Next, the series terminal 223 and the output terminal 224 connected to the electrode terminal of the battery cell 220 will be described in detail. In the following, in the following, the eight series terminals 223 connecting the nine battery cells 220 in series are assigned a number that increases as the potential increases, and the first series terminals 223a to the eighth series are assigned. It is shown as terminal 223h. Further, the output terminal 224 connected to the negative electrode terminal 222 having the lowest potential is referred to as the lowest output terminal 224a. The output terminal 224 connected to the positive electrode terminal 221 having the highest potential is referred to as the maximum output terminal 224b.

As shown in FIG. 2, the first series terminal 223a, the third series terminal 223c, the fifth series terminal 223e, the seventh series terminal 223g, and the maximum output terminal 224b are sequentially arranged in the direction away from the wiring board 11 in the vertical direction. They are lined up. The first series terminal 223a, the third series terminal 223c, the fifth series terminal 223e, the seventh series terminal 223g, and the maximum output terminal 224b are mechanically and electrically with the electrode terminals constituting the first electrode terminal group 211. Connected to.

Similarly, the lowest output terminal 224a, the second series terminal 223b, the fourth series terminal 223d, the sixth series terminal 223f, and the eighth series terminal 223h are arranged in this order in the vertical direction away from the wiring board 11. .. These minimum output terminals 224a, second series terminal 223b, fourth series terminal 223d, sixth series terminal 223f, and eighth series terminal 223h are mechanically and electrically with the electrode terminals constituting the second electrode terminal group 212. Connected to.

The vertical length of each of the first series terminal 223a to the eighth series terminal 223h is equal to or less than the vertical length of the two battery cells 220 arranged adjacent to each other in the vertical direction. On the other hand, the vertical lengths of the minimum output terminal 224a and the maximum output terminal 224b are equal to or less than the vertical length of one battery cell 220.

The vertical length of the two battery cells 220 arranged adjacent to each other in the vertical direction means, for example, when the two battery cells 220 are arranged so as to face each other with the first main surface 220e in the vertical direction. This corresponds to the vertical separation distance of the second main surface 220f of the cell 220. In the following, for the sake of simplicity, this separation distance is referred to as a series separation distance. Further, the length of half of this series separation distance is referred to as a cell width. When there is a gap between two battery cells 220 arranged in the vertical direction, the cell width is longer than the length in the vertical direction of the battery cell 220 due to the gap.

The positive electrode terminal 221 is connected to one of both ends in the vertical direction of the series terminal 223, and the negative electrode terminal 222 is connected to the other end. Then, as will be described later, the wiring portion 30 is electrically connected to the midpoint in the vertical direction of the series terminal 223. In the following, the connection portion between the series terminal 223 and the wiring portion 30 at each of the output terminals 224 is referred to as a connection point CP. In the drawing, the connection point CP is shown by a black dot. The connection point CP of the series terminal 223 is equal to the above midpoint.

Since the connection point CP is equal to the midpoint, the separation distance between the connection point CP at the series terminal 223 and the connection point (first connection point) between the positive electrode terminal 221 and the connection point CP and the negative electrode terminal 222 at the series terminal 223. The separation distance between the connection points (second connection points) of the above is equal. As a result, the resistance between the connection point CP and the first connection point at the series terminal 223 is equal to the resistance between the connection point CP and the second connection point at the series terminal 223. When a current flows through the series terminal 223, the voltage drops generated by these two resistances are equal.

Further, the connection point CPs of the two series terminals 223 arranged adjacent to each other in the vertical direction are separated by a series separation distance in the vertical direction. The connection point CP of the output terminal 224 with the wiring portion 30 and the connection point CP of the series terminals 223 arranged adjacent to the output terminal 224 in the vertical direction are separated by a distance half shorter than the series separation distance by half the cell width. There is.

The connection point CPs of the two series terminals 223, which are arranged in the order of potential and are separated from each other in the horizontal direction, are separated by the cell width in the vertical direction. The vertical separation distance between the connection point CP of the output terminal 224 and the connection point CP of the series terminal 223, which is next in the potential order with the output terminal 224 and is located at a distance in the horizontal direction, is the cell width. It is half of.

<Structure of wiring part>
Next, the configuration of the wiring unit 30 will be described in detail with reference to FIGS. 3 to 9. As described above, the wiring unit 30 has a front wiring unit 31 and a back wiring unit 32. The front wiring portion 31 and the back wiring portion 32 each have a flexible board 33 and a plurality of wiring patterns 34. The front wiring unit 31 corresponds to the first wiring unit. The back wiring portion 32 corresponds to the second wiring portion.

The front wiring portion 31 and the back wiring portion 32 have the same configuration. Therefore, the flexible substrate 33 and the wiring pattern 34 of the front wiring portion 31 and the flexible substrate 33 and the wiring pattern 34 of the back wiring portion 32 have the same shape. In FIG. 3, the front and back of the front wiring portion 31 and the back wiring portion 32 are reversed, and the front wiring portion 31 and the back wiring portion 32 are separated from each other in the lateral direction.

The flexible substrate 33 is thinner than the wiring board 11 and is made of a flexible resin material. Therefore, the flexible substrate 33 is bendable.

The flexible substrate 33 has a rectangular base plate 35 extending in the vertical direction. The vertical length of the base plate 35 is longer than the vertical length of the battery stack 210. Although not shown, the mother plate 35 may have a notch or a part thereof having a bellows structure so that a large deformation is possible. Further, in order to avoid obstructing the flow of wind in the accommodation space formed by the battery case, the mother plate 35 may be formed with a notch or a hole penetrating in the height direction.

The flexible substrate 33 has a plurality of protrusions 36 integrally formed with the mother plate 35. The protrusion 36 extends laterally from one of the two vertically extending sides of the master plate 35. The plurality of protrusions 36 are arranged vertically spaced apart from each other. The vertical separation distance of the two protrusions 36 arranged adjacent to each other in the vertical direction is equal to the above-mentioned series separation distance. The base plate 35 corresponds to a flexible substrate. The direction of the protrusion 36 extending from the mother plate 35 is not limited to the lateral direction. For example, the protrusion 36 may extend in an oblique direction inclined from the horizontal direction to the vertical direction.

The flexible substrate 33 has one protruding portion 37 integrally formed with the mother plate 35. The protruding portion 37 extends along the vertical direction from one of the two laterally extending sides of the mother plate 35. The lateral length of the protruding portion 37 is shorter than the lateral length of the mother plate 35. A via is formed in the protruding portion 37 to electrically connect the front surface 33a and the back surface 33b of the flexible substrate 33.

The wiring pattern 34 is formed on the surface 33a of each of the mother plate 35, the protrusion 36, and the protrusion 37. The wiring pattern 34 is covered with a coating resin. The wiring pattern 34 has an L-shape on the surface 33a. The number of wiring patterns 34 and the number of protrusions 36 are the same.

One end side of the wiring pattern 34 is formed on the protrusion 36. The center side of the wiring pattern 34 is formed on the mother plate 35. The other end side of the wiring pattern 34 is formed on the protruding portion 37. The tip of the wiring pattern 34 on one end side is mechanically and electrically connected to the series terminal 223 and the output terminal 224 by welding or the like. The tip of the other end of the wiring pattern 34 is connected to the via. This via is mechanically and electrically connected to the board wiring 14 of the wiring board 11 by soldering or the like. It is also possible to adopt a configuration in which one end and the other end of the wiring pattern 34 are exposed to the outside of the flexible substrate 33 and the coating resin, respectively.

As described above, the vertical separation distance of the two protrusions 36 arranged adjacent to each other in the vertical direction is equal to the series separation distance. Therefore, the separation distance on one end side of the two wiring patterns 34 arranged adjacent to each other in the vertical direction is also equal to the series separation distance.

The protrusion 36 can be curved in the vertical direction and the horizontal direction. Therefore, one end side of the wiring pattern 34 provided on the protrusion 36 can also be curved in the vertical direction and the horizontal direction. The vertical separation distance of the tips on one end side of the two wiring patterns 34 arranged adjacent to each other in the vertical direction is variable.

<Connection form between front wiring and back wiring>
As described above, the front wiring portion 31 and the back wiring portion 32 have the same configuration. The front wiring portion 31 and the back wiring portion 32 are connected to the wiring board 11 in a state where they are arranged side by side so as to be separated from each other in the lateral direction. Then, the front wiring portion 31 and the back wiring portion 32 are inverted and connected to the wiring board 11.

As shown in FIG. 4, in the front wiring portion 31, the back surface 33b of the protruding portion 37 is connected to the front surface 11a of the wiring board 11. In the back wiring portion 32, the surface 33a of the protruding portion 37 is connected to the surface 11a.

In particular, in the present embodiment, the front wiring portion 31 and the back wiring portion 32 are vertically displaced and connected to the wiring board 11. The front wiring portion 31 is connected to the wiring board 11 in such a manner that only the protruding portion 37 is located on the surface 11a of the wiring board 11. On the other hand, the back wiring portion 32 is connected to the wiring board 11 in such a manner that the connecting portion side of the protruding portion 37 and the protruding portion 37 in the mother plate 35 is also located on the surface 11a. The length of the vertical arrangement deviation of the front wiring portion 31 and the back wiring portion 32 with respect to the wiring board 11 is the above-mentioned cell width.

Due to the connection configuration of the front wiring portion 31 and the back wiring portion 32 to the wiring board 11 shown above, the extension directions of the protrusions 36 are opposite in the front wiring portion 31 and the back wiring portion 32. The protrusion 36 of the front wiring portion 31 extends laterally so as to be separated from the back wiring portion 32. The protrusion 36 of the back wiring portion 32 extends laterally so as to be separated from the front wiring portion 31. The plurality of protrusions 36 of the front wiring portion 31 and the plurality of protrusions 36 of the back wiring portion 32 are displaced by the cell width in the vertical direction.

<Mounting mode of front wiring part and back wiring part>
As described above, the front wiring portion 31 and the back wiring portion 32 are inverted and connected to the wiring board 11. Therefore, the front wiring portion 31 and the back wiring portion 32 have different mounting modes on the battery stack 210.

As shown in FIG. 5, the front wiring portion 31 is mounted on the battery stack 210 in such a manner that the back surface 33b of the flexible substrate 33 faces the upper end surface 220a of the battery cell 220. The back wiring portion 32 is mounted on the battery stack 210 in such a manner that the surface 33a of the flexible substrate 33 faces the upper end surface 220a.

The front wiring portion 31 and the back wiring portion 32 are provided between the first electrode terminal group 211 and the second electrode terminal group 212 on the upper end surface 220a of the plurality of battery cells 220. The front wiring unit 31 is located on the side of the first electrode terminal group 211. The back wiring portion 32 is located on the second electrode terminal group 212 side.

With the front wiring portion 31 provided on the upper end surfaces 220a of the plurality of battery cells 220, the plurality of protrusions 36 of the front wiring portion 31 extend laterally toward the first electrode terminal group 211 side. With the back wiring portion 32 provided on the upper end surfaces 220a of the plurality of battery cells 220, the protrusion 36 of the back wiring portion 32 extends laterally toward the second electrode terminal group 212 side.

As shown in FIG. 6, one end of the wiring pattern 34 provided on the protrusion 36 of the table wiring portion 31 includes a first series terminal 223a, a third series terminal 223c, a fifth series terminal 223e, and a seventh series terminal 223g. And, it is connected to the connection point CP of the maximum output terminal 224b. One end of the wiring pattern 34 provided on the protrusion 36 of the back wiring portion 32 is a minimum output terminal 224a, a second series terminal 223b, a fourth series terminal 223d, a sixth series terminal 223f, and an eighth series terminal 223h. Connected to the connection point CP.

As described above, the wiring portion 30 and the battery stack 210 have an electrical connection configuration shown in FIG. The voltages of all the battery cells 220 constituting the battery stack 210 can be detected by the wiring unit 30.

<Structure of protrusion>
Next, the configuration of the protrusion 36 will be described in detail with reference to FIGS. 5 to 9.

As shown in FIG. 5, on the flexible substrate 33 of the table wiring portion 31, the series terminals 223 connecting the electrode terminals constituting the first electrode terminal group 211, the protrusions 36 equal to or more than the total number of the output terminals 224, and the wiring pattern 34 is formed. Similarly, on the flexible substrate 33 of the back wiring portion 32, a series terminal 223 connecting the electrode terminals constituting the second electrode terminal group 212, a protrusion 36 equal to or larger than the total number of the output terminals 224, and a wiring pattern 34 are formed. There is. Specifically, six protrusions 36 and a wiring pattern 34 are formed on the flexible substrate 33 of the front wiring portion 31 and the back wiring portion 32.

As described above, the separation distance between the two protrusions 36 arranged adjacent to each other in the vertical direction is equal to the series separation distance. The plurality of protrusions 36 of the front wiring portion 31 and the plurality of protrusions 36 of the back wiring portion 32 are displaced by the cell width in the vertical direction.

Therefore, as shown in FIG. 5, the plurality of protrusions 36 of the table wiring portion 31 face each other in the height direction with the connection point CP of the series terminal 223 connected to the electrode terminals constituting the first electrode terminal group 211. It is arranged in the battery stack 210. Then, for the connection point CPs of the first series terminal 223a, the third series terminal 223c, the fifth series terminal 223e, and the seventh series terminal 223g connected to the electrode terminals constituting the first electrode terminal group 211. A plurality of protrusions 36 face each other in the height direction.

However, the connection point CP of the maximum output terminal 224b and the seventh series terminal 223g arranged adjacent to the maximum output terminal 224b in the vertical direction are separated by a distance that is half the cell width shorter than the series separation distance. Therefore, the protrusion 36 of the table wiring portion 31 connected to the maximum output terminal 224b is vertically deviated from the connection point CP of the maximum output terminal 224b by half the cell width.

On the other hand, the plurality of protrusions 36 of the back wiring portion 32 are connected to the electrode terminals constituting the second electrode terminal group 212 by the arrangement of the front wiring portion 31 on the battery stack 210. It faces the connection point CP in the height direction. That is, the connection point CP of each of the second series terminal 223b, the fourth series terminal 223d, the sixth series terminal 223f, and the eighth series terminal 223h and the protrusion 36 of the back wiring portion 32 face each other in the height direction.

However, the connection point CP of the minimum output terminal 224a and the second series terminal 223b arranged adjacent to the minimum output terminal 224a in the vertical direction are separated by a distance that is half the cell width shorter than the series separation distance. Therefore, the protrusion 36 of the back wiring portion 32 connected to the minimum output terminal 224a is vertically deviated from the connection point CP of the minimum output terminal 224a by half the cell width.

As is shown in FIG. 5, the lateral length of the plurality of protrusions 36 is the lateral distance between the extension side of the plurality of protrusions 36 in the mother plate 35 and the connection point CP (the lateral length). It is longer than the connection distance). Specifically, the lateral length of the protrusion 36 is longer than the connection distance by the cell width or more.

Therefore, by bending the protrusion 36, it is possible to displace the tip of the protrusion 36 in the vertical direction by the cell width or more while setting the lateral position of the tip of the protrusion 36 to the lateral position of the connection point CP. It has become.

The lateral length of the protrusion 36 may be longer than the connection distance by half or more of the cell width. Furthermore, the lateral length of the protrusion 36 may be (α ² + β ² ) ^0.5 or more longer according to the Pythagorean theorem, where α is the connection distance and β is half the cell width.

FIG. 6 shows a state in which the protrusion 36 is bent. By bending the protrusion 36 once in the vertical direction, the extension direction of the protrusion 36 is changed to the vertical direction. After that, the tip side of the bent portion is bent once in the lateral direction. By doing so, the extension direction of the protrusion 36 is changed to the lateral direction again. By doing so, the positions of the tip of the protrusion 36 in the vertical direction and the horizontal direction can be displaced. By bending the protrusion 36 once, the extension direction of the protrusion 36 may be an oblique direction inclined from the horizontal direction to the vertical direction.

Due to the bending shown above, the protrusion 36 of the table wiring portion 31 separated from the connection point CP of the maximum output terminal 224b by half the cell width in the vertical direction is connected to the connection point CP of the maximum output terminal 224b. The protrusion 36 of the back wiring portion 32, which is vertically separated from the connection point CP of the minimum output terminal 224a by half the cell width, is connected to the connection point CP of the minimum output terminal 224a.

As described above, the lateral lengths of the plurality of protrusions 36 are longer than the connection distance. Therefore, as shown in FIG. 5, the tips of the plurality of protrusions 36 and the positions of the connection point CPs of the series terminals 223 are laterally different. In order to adjust this, for example, as shown in FIG. 6, the lateral position of the tip of the protrusion 36 may be adjusted by removing a part of the protrusion 36. The lateral position of the tip of the protrusion 36 may be adjusted by folding the protrusion 36 in the lateral direction. Alternatively, for example, as shown in FIG. 7, the portion of the protrusion 36 facing the connection point CP may be welded and joined to the connection point CP without removing the protrusion 36.

Further, each of the front wiring portion 31 and the back wiring portion 32 has a total of six protrusions 36. In the case of the present embodiment, of these six protrusions 36, one protrusion 36 farthest from the wiring board 11 does not contribute to the connection with the battery stack 210. Therefore, this protrusion 36 becomes unnecessary.

In this case, for example, as shown in FIG. 6, the unnecessary protrusion 36 of the front wiring portion 31 may be removed. The tip of the unnecessary protrusion 36 of the back wiring portion 32 may be fixed to the base plate 35 by welding, soldering, or the like. Alternatively, by forming a slit in the base plate 35, the tip of an unnecessary protrusion 36 may be fixed to the slit. Further, for example, as shown in FIG. 7, the tip portion of the master plate 35 connecting the unnecessary protrusions 36 in the front wiring portion 31 and the back wiring portion 32 may be removed. In the drawings shown below, the monitoring device 100 in a state where the unnecessary protrusion 36 is not removed is shown.

The protrusion 36 is bent as described above, but as shown in the column (a) of FIG. 8, for example, a perforation 36a for facilitating this bending may be formed in the protrusion 36. As shown in column (b) of FIG. 8, a notch 36b for facilitating bending may be formed in the protrusion 36. In FIG. 8, the perforation 36a is shown by a broken line in order to clarify the positional relationship between the perforation 36a and the wiring pattern 34 formed on the protrusion 36. The wiring pattern 34 is shown by hatching.

The perforation 36a consists of a plurality of intermittent cuts arranged in a straight line. The perforation 36a is formed on a line along an angle inclined with respect to the horizontal direction and the vertical direction so that the extension direction of the protrusion 36 can be changed in the horizontal direction and the vertical direction. Specifically, the perforations 36a are formed on a line inclined by ± 45 ° from the vertical direction to the horizontal direction. Further, in the modified example shown in FIG. 8, the perforation 36a is formed on a straight line along the vertical direction so that the length of the protrusion 36 in the extension direction can be adjusted. The perforations 36a in the diagonal direction and the perforations 36a along the vertical direction are formed at equal intervals in the extension direction of the protrusion 36.

As is shown in FIG. 8, the perforation 36a crosses the wiring pattern 34. Therefore, a part of the wiring pattern 34 is removed by the cut of the perforation 36a. However, the width of the perforation 36a in the wiring pattern 34 in the forming direction is longer than one of the plurality of cuts constituting the perforation 36a.

As shown in the column (b) of FIG. 8, the notch 36b is formed at an angle inclined with respect to the horizontal direction and the vertical direction so that the extension direction of the protrusion 36 can be changed in the horizontal direction and the vertical direction. .. Specifically, the notch 36b is formed in the protrusion 36 so that the width of the protrusion 36 in the direction inclined by ± 45 ° from the vertical direction to the horizontal direction is shortened. Two notches 36b are formed side by side with the wiring pattern 34 interposed therebetween. The two notches 36b are formed at equal intervals in the extension direction of the protrusion 36. In particular, in the configuration shown in the column (b) of FIG. 8, the perforations 36a in the diagonal direction and the perforations 36a in the vertical direction are formed between the two notches 36b.

Further, as shown in FIG. 9, the protrusion 36 may be formed with a fixing portion 38 for fixing the bent state of the protrusion 36. For example, as shown in the column (a) of FIG. 9, as the fixing portion 38, a cut formed in the protrusion 36 can be adopted. The bent state of the protrusion 36 may be fixed by inserting a part of the protrusion 36 into this cut.

As shown in the column (b) of FIG. 9, as the fixing portion 38, a metal pad formed on the protrusion 36 can be adopted. The metal pad is melted in a state where a part of the protrusion 36 is in contact with the metal pad. By doing so, the bent state of the protrusion 36 may be fixed.

As shown in the column (c) of FIG. 9, as the fixing portion 38, a cut and a hole formed in the protrusion 36 can be adopted. The convex portion formed by this cut is fitted into the hole. As a result, the bent state of the protrusion 36 may be fixed.

<Action effect>
Next, the operation and effect of the monitoring device 100 will be described. As described above, the protrusion 36 on which the wiring pattern 34 is formed is bent so as to extend in the vertical direction and the horizontal direction. Therefore, even if the relative positions of the series terminal 223 and the output terminal 224 and the protrusion 36 are displaced due to a design change of the battery stack 210 or the like, the wiring pattern 34 formed on the protrusion 36 is replaced with the series terminal 223. It can be connected to the output terminal 224.

For example, even if the vertical physique of the battery cell 220 increases or decreases as shown in FIGS. 10 and 11, the wiring pattern 34 formed on the protrusion 36 can be connected to the series terminal 223 and the output terminal 224. As shown in FIGS. 12 and 13, even if the vertical arrangement of the plurality of battery cells 220 (the number of battery cells 220) of the battery stack 210 is changed, the wiring pattern 34 formed on the protrusion 36 is provided. It can be connected to the series terminal 223 and the output terminal 224. Although not shown, the wiring pattern 34 formed on the protrusion 36 can be connected to the series terminal 223 and the output terminal 224 even if the monitoring device 100 is misaligned with respect to the battery stack 210.

As described above, the monitoring device 100 is highly versatile in response to a design change of the battery stack 210 and the like.

The length of the protrusion 36 extending from the mother plate 35 is longer than the cell width (connection distance) between the side of the mother plate 35 where the protrusion 36 starts to extend and the connection point CP. It has become.

According to this, even if the relative positional deviation between the series terminal 223 and the output terminal 224 and the protrusion 36 occurs due to a design change of the battery stack 210 or the like, the wiring pattern 34 formed on the protrusion 36 is formed. Can be connected to the series terminal 223 and the output terminal 224.

Perforations 36a are formed on the protrusions 36. The perforations 36a are formed on a line along an angle inclined with respect to the horizontal direction and the vertical direction. Further, the perforations 36a are formed on a straight line along the vertical direction.

Further, a notch 36b is formed in the protrusion 36. The notch 36b is formed so that the width of the protrusion 36 in the direction inclined with respect to the horizontal direction and the vertical direction is locally narrowed. Further, two notches 36b are formed side by side with the wiring pattern 34 interposed therebetween.

At least one of the perforations 36a and the notch 36b facilitates bending of the protrusion 36. Therefore, it is easy to change the extension direction of the protrusion 36. It is easy to adjust the length of the protrusion 36 in the extension direction.

The width of the perforations 36a in the wiring pattern 34 in the forming direction is longer than one of the plurality of cuts constituting the perforations 36a. As a result, the wiring pattern 34 is prevented from being broken due to the formation of the perforations 36a.

The monitoring device 100 has a front wiring unit 31 and a back wiring unit 32 having exactly the same configuration. As a result, the increase in the number of parts of the monitoring device 100 is suppressed.

The separation distance between the plurality of protrusions 36 of the front wiring portion 31 and the back wiring portion 32 is equal to the separation distance (series separation distance) of the connection point CPs of the plurality of series terminals 223 arranged adjacent to each other in the vertical direction. ..

Further, the front wiring portion 31 and the back wiring portion 32 are arranged in the order of potential and are displaced by the vertical separation distance (cell width) of the connection point CPs of the two series terminals 223 located separately in the horizontal direction. It is connected to the wiring board 11.

As described above, as shown in FIG. 5, the plurality of protrusions 36 of the table wiring portion 31 are higher than the connection point CP of each of the plurality of series terminals 223 connected to the electrode terminals constituting the first electrode terminal group 211. Oppose in the vertical direction. The plurality of protrusions 36 of the back wiring portion 32 face each other of the connection point CPs of the plurality of series terminals 223 connected to the electrode terminals constituting the second electrode terminal group 212 in the height direction. In order to change the extension direction of the protrusion 36 connected to the series terminal 223 to the vertical direction, it is not necessary to bend the protrusion 36. All that is required is to bend the protrusion 36 connected to the output terminal 224. The connection arrangement of the monitoring device 100 to the battery stack 210 becomes easy.

The connection point CP with the wiring pattern 34 formed on the protrusion 36 in each of the plurality of series terminals 223 is the midpoint of the series terminals 223. Therefore, the voltage drop caused by the resistance of the series terminal 223 and the flowing current included in the voltage detected in each of the plurality of wiring patterns 34 is about the same. As a result, it is possible to suppress variations in the voltage detection accuracy of the plurality of battery cells.

(First modification)
In the present embodiment, as shown in FIG. 4, the back wiring portion 32 is connected to the wiring board 11 in such a manner that the connecting portion side of the protruding portion 37 and the protruding portion 37 in the mother plate 35 is also located on the surface 11a. Indicated. However, as shown in FIG. 14, in a state where the tips of the front wiring portion 31 and the back wiring portion 32 are vertically displaced by the cell width, only the protruding portion 37 of the back wiring portion 32 is located on the surface 11a. It is also possible to adopt a configuration in which the wiring unit 32 is connected to the wiring board 11. In FIG. 14, by bending the back wiring portion 32, the connecting portion side of the protruding portion 37 in the master plate 35 located on the surface 11a in FIG. 4 is overlapped with the portion provided in the battery stack 210 in the master plate 35. It is arranged. According to this, the increase of the overlapping region of the wiring board 11 and the wiring portion 30 is suppressed. The decrease in the mounting area of the first electronic element 12 on the wiring board 11 is suppressed. The increase in the physique of the wiring board 11 is suppressed.

(Second Embodiment)
Next, the second embodiment will be described with reference to FIGS. 15 to 19. The monitoring device 100 according to each of the following embodiments has much in common with those according to the above-described embodiments. Therefore, in the following, the explanation of the common part will be omitted, and the different parts will be explained with emphasis. Further, in the following, the same reference numerals are given to the same elements as those shown in the above-described embodiment.

In the first embodiment, an example is shown in which the front wiring portion 31 and the back wiring portion 32 are connected to the wiring board 11 in a state where the cell width is displaced in the vertical direction. On the other hand, in the present embodiment, the front wiring portion 31 and the back wiring portion 32 are connected to the wiring board 11 without being displaced in the vertical direction.

In the case of this configuration, as shown in FIG. 15, the protrusion 36 of the front wiring portion 31 and the protrusion 36 of the back wiring portion 32 are arranged side by side in the horizontal direction. Therefore, when the monitoring device 100 is mounted on the battery stack 210 as shown in FIG. 16, the protrusion 36 of the front wiring portion 31 faces the connection point CP of the series terminal 223 to be connected in the height direction. However, the protrusion 36 of the back wiring portion 32 is positioned so as to be vertically offset from the connection point CP of the series terminal 223 to be connected by the cell width.

Also in such a configuration, by bending the protrusion 36 as shown in FIG. 17, the wiring pattern 34 of the protrusion 36 can be connected to each of the series terminal 223 and the output terminal 224 to be connected.

Further, as shown in FIGS. 18 and 19, for example, as the number of battery cells 220 increases, the relative positions of the series terminal 223 and the output terminal 224 and the protrusion 36 may be displaced. Even in such a case, the wiring pattern 34 formed on the protrusion 36 can be connected to the series terminal 223 and the output terminal 224 by bending the protrusion 36.

The monitoring device 100 according to the present embodiment and the monitoring devices 100 of various forms shown below include the same components as the monitoring device 100 described in the first embodiment. Therefore, it has the same effect. Therefore, in order to avoid complicated notation, the description is omitted.

(Third Embodiment)
Next, the third embodiment will be described with reference to FIGS. 20-22.

In the first embodiment, an example is shown in which the front wiring portion 31 and the back wiring portion 32 have exactly the same configuration. However, as shown in FIG. 20, different configurations can be adopted for the front wiring portion 31 and the back wiring portion 32.

The structural difference between the front wiring portion 31 and the back wiring portion 32 according to the present embodiment is the formation position of the protrusion 36. The formation positions of the protrusions 36 of the front wiring portion 31 and the back wiring portion 32 are displaced from each other by the cell width. However, the distance between the plurality of protrusions 36 in each of the front wiring portion 31 and the back wiring portion 32 is the same as the series separation distance.

Further, the connection area between the front wiring portion 31 and the wiring board 11 of each of the back wiring portions 32 is the same. That is, the front wiring portion 31 and the back wiring portion 32 are connected to the wiring board 11 in such a manner that only the protruding portions 37 of the front wiring portion 31 and the back wiring portion 32 are located on the surface 11a.

When the monitoring device 100 is arranged on the battery stack 210 as shown in FIG. 21, the connection point CP of the series terminal 223 and the protrusion 36 face each other in the height direction in the same manner as in the first embodiment. The connection point CP of the output terminal 224 and the protrusion 36 are arranged so as to be offset in the vertical direction.

Therefore, as shown in FIG. 22, in the same manner as in the first embodiment, only by bending one protrusion 36 of the front wiring portion 31 and the back wiring portion 32, each of the plurality of protrusions 36 and the plurality of series terminals 223 are bent. And two output terminals 224 can be connected.

(Second modification)
In this embodiment, an example having a front wiring portion 31 and a back wiring portion 32 having different configurations is shown. However, in the case of such a configuration, as shown in FIG. 23, a configuration in which the front wiring portion 31 and the back wiring portion 32 share one flexible substrate 33 can be adopted. As shown in this embodiment, the configuration does not have to be divided into the front wiring portion 31 and the back wiring portion 32.

(Fourth Embodiment)
Next, the fourth embodiment will be described with reference to FIGS. 24-26.

In the third embodiment, an example is shown in which the formation positions of the protrusions 36 of the front wiring portion 31 and the back wiring portion 32 are displaced by the cell width. On the other hand, in the present embodiment, as shown in FIG. 24, the forming positions of the protrusions 36 of the front wiring portion 31 and the back wiring portion 32 are deviated by half of the cell width.

As shown in FIG. 25, when the monitoring device 100 of the present embodiment is arranged on the battery stack 210, the connection point CP of the series terminal 223 and the protrusion 36 face each other in the height direction. Not only that, the protrusion 36 of the back wiring portion 32 faces the connection point CP of the minimum output terminal 224a in the height direction.

Therefore, as shown in FIG. 26, it is possible to connect each of the plurality of protrusions 36 to the plurality of series terminals 223 and the two output terminals 224 by bending only one protrusion 36 of the table wiring portion 31. ..

(Third modification example)
In such a configuration, similarly to the second modification, a configuration in which the front wiring portion 31 and the back wiring portion 32 share one flexible substrate 33 can be adopted as shown in FIG. 27. It does not have to be a configuration in which the front wiring portion 31 and the back wiring portion 32 are separated.

(Fifth Embodiment)
Next, the fifth embodiment will be described with reference to FIGS. 28 to 32.

In each embodiment so far, an example is shown in which the series terminal 223 and the output terminal 224 extend in the vertical direction. On the other hand, in the present embodiment, a part of the series terminal 223 and the output terminal 224 extends in the lateral direction.

As shown in FIG. 28, the series terminal 223 has a first connecting portion 225 and a first connecting portion 226 that are integrally connected. The output terminal 224 has a second connecting portion 227 and a second connecting portion 228 that are integrally connected.

The first connecting portion 225 connects the positive electrode terminal 221 and the negative electrode terminal 222. The second connecting portion 227 is connected to the negative electrode terminal 222 having the lowest potential or the positive electrode terminal 221 having the highest potential. Each of the first connection portion 226 and the second connection portion 228 is connected to the wiring pattern 34 formed on the protrusion 36. The first connection unit 226 and the second connection unit 228 are connected to the input terminal of the comparator 20 having a high input impedance via the wiring of the wiring pattern 34, the board wiring 14, and the monitoring IC chip 13.

Due to the connection configuration shown above, a current flowing through the battery stack 210 in which a plurality of battery cells 220 are connected in series flows through the first connecting portion 225 and the second connecting portion 227. A small amount of current flows through the first connecting portion 226 and the second connecting portion 228 as compared with the current flowing through the first connecting portion 225 and the second connecting portion 227. In the following, for the sake of simplicity, the current flowing through the first connecting portion 225 and the second connecting portion 227 is referred to as the main current. The current flowing through the first connection portion 226 and the second connection portion 228 is referred to as a detection current.

The first connecting portion 225 has a rectangular shape extending in the vertical direction. The length of the first connecting portion 225 in the vertical direction is equal to or less than the series separation distance.

The first connecting portion 226 extends laterally from the first connecting portion 225. The first connecting portion 226 is a region between the positive electrode terminal 221 and the negative electrode terminal 222 on the upper end surface 220a of the plurality of battery cells 220 in a state where the first connecting portion 225 is connected to the positive electrode terminal 221 and the negative electrode terminal 222. And are separated from each other in the height direction and face each other.

The first connection portion 226 is laterally arranged from the midpoint between the connection point (first connection point) with the positive electrode terminal 221 and the connection point (second connection point) with the negative electrode terminal 222 in the first connection portion 225. It is extended. The separation distance between the end portion extending from the first connection portion 225 and the first connection point in the first connection portion 226 is equal to the separation distance between the end portion of the first connection portion 226 and the second connection point. With this configuration, the resistance value between the first connection point in the first connection portion 225 and the end portion of the first connection portion 226, and the end portion of the second connection point and the first connection portion 226 in the first connection portion 225. The resistance value between and is equal to each other. The first connection point corresponds to the first connection portion. The second connection point corresponds to the second connection portion.

The second connecting portion 227 has a rectangular shape. The length of the second connecting portion 227 in the vertical direction is equal to or less than the cell width. The second connecting portion 228 extends laterally from the second connecting portion 227. The second connecting portion 228 has a region and a height between the positive electrode terminal 221 and the negative electrode terminal 222 on the upper end surface 220a of the battery cell 220 in a state where the second connecting portion 227 is connected to the negative electrode terminal 222 or the positive electrode terminal 221. They are separated from each other in the direction and face each other.

29, 30, 31, and 32 show a configuration in which the monitoring device 100 shown in various forms so far is mounted on the battery stack 210 having the series terminal 223 and the output terminal 224. As shown in these, even if the series terminal 223 and the output terminal 224 to be connected and the protrusion 36 are separated in the vertical direction, the protrusion 36 is bent once and extended in the vertical direction. , The monitoring device 100 and the battery stack 210 can be connected. In this way, the number of times the protrusion 36 is bent can be reduced to one.

Further, the detected current flowing through the first connecting portion 226 and the second connecting portion 228 to which the wiring pattern 34 is connected has a smaller amount of current than the main current flowing through the first connecting portion 225 and the second connecting portion 227. There is. Therefore, the voltage drop caused by the resistance and current of the first connection portion 226 and the second connection portion 228 included in the voltage of the battery cell 220 detected by the wiring pattern 34 is very small.

Therefore, even if the connection positions of the wiring pattern 34 with respect to the first connection portion 226 and the second connection portion 228 are displaced, the voltage detection accuracy of the battery cells 220 detected by the plurality of wiring patterns 34 varies. It becomes about this minute voltage drop. As a result, it is possible to suppress variations in the detection accuracy of the voltage of the battery cell 220 detected in each of the plurality of wiring patterns 34.

Although the preferred embodiments of the present disclosure have been described above, the present disclosure can be variously modified and implemented without being limited to the above-described embodiments and within a range that does not deviate from the gist of the present disclosure. Is.

(Fourth modification)
In this embodiment, an example in which the fuse 61 and the inductor 62 are provided on the flexible substrate 33 is shown. On the other hand, in addition to the fuse 61 and the inductor 62, for example, a Zener diode 15, a parallel capacitor 16, and a resistor 17 may be provided on the flexible substrate 33.

(Fifth variant)
In this embodiment, an example in which the wiring pattern 34 is formed on the surface 33a is shown. However, it is also possible to adopt a configuration in which the wiring pattern 34 is formed on the back surface 33b. It is also possible to adopt a configuration in which the wiring pattern 34 is formed on both the front surface 33a and the back surface 33b.

(Sixth modification)
In each embodiment, an example is shown in which the battery module 200 has one battery stack 210. However, the battery module 200 may have a plurality of battery stacks 210. In this case, the housing of the battery module 200 is configured with a storage space corresponding to each battery stack 210. These plurality of accommodation spaces are provided side by side in the horizontal direction.

For example, when the battery cells 220 of the two battery stacks 210 are connected in series, the two battery stacks 210 have the same number of even number of battery cells 220. The plurality of battery cells of each of the two battery stacks 210 are arranged vertically. The negative electrode terminal 222 of the battery cell 220 located at the right end of one of the two battery stacks 210 in the vertical direction and the positive electrode terminal 221 of the battery cell 220 located at the right end of the other of the two battery stacks 210 It is electrically connected via a wire. As a result, the negative electrode terminal 222 of the battery cell 220 located at the left end in the vertical direction of one of the two battery stacks 210 has the lowest potential, and the positive electrode terminal 221 of the battery cell 220 located at the left end of the other has the highest potential. The positive electrode terminal 221 having the highest potential and the negative electrode terminal 222 having the lowest potential are arranged side by side in the horizontal direction. A wiring unit 30 is provided in each of these two battery stacks 210.

(Other variants)
In this embodiment, an example in which the battery pack 400 is applied to a hybrid vehicle is shown. However, the battery pack 400 can also be applied to, for example, a plug-in hybrid vehicle or an electric vehicle.

10 ... monitoring unit, 20 ... comparator, 30 ... wiring unit, 31 ... front wiring unit, 32 ... back wiring unit, 33a ... front surface, 33b ... back surface, 34 ... wiring pattern, 35 ... mother plate, 36 ... protrusion, 36a ... Cut, 36b ... Notch, 100 ... Monitoring device, 200 ... Battery module, 210 ... Battery stack, 211 ... First electrode terminal group, 212 ... Second electrode terminal group, 220 ... Battery cell, 220a ... Upper end surface, 221 ... Positive terminal, 222 ... Negative terminal, 223 ... Series terminal, 224 ... Output terminal, 225 ... First connection part, 226 ... First connection part, 300 ... Battery ECU, 400 ... Battery pack, CP ... Connection point

Claims (9)

A plurality of battery cells (220) formed on the formed surface (220a) in such a manner that the positive electrode terminal (221) and the negative electrode terminal (222) are separated from each other are along the formed surface and the positive electrode terminal and the negative electrode terminal are separated from each other. The first electrode terminal group (211) in which the positive electrode terminal and the negative electrode terminal are alternately arranged in the predetermined direction by arranging in a predetermined direction intersecting in the separation direction, and the first electrode terminal group is the positive electrode terminal. A second electrode terminal group (212) in which the arrangement of the negative electrode terminals is reversed is configured, and connecting terminals (223, 223a to 223h, 224, 224a, 224b) are connected to at least one of the positive electrode terminal and the negative electrode terminal. Is a monitoring device (100) connected to a connected battery stack (210).
A monitoring unit (10) that monitors the voltage of the battery cell,
It has a wiring unit (30) for connecting the connecting terminal and the monitoring unit, and has a wiring unit (30).
The wiring part is
A flexible substrate (35) provided between the first electrode terminal group and the second electrode terminal group in a manner facing the forming surface of the plurality of battery cells.
A plurality of protrusions (36) extending from the flexible substrate and
It has a flexible substrate and a wiring pattern (34) formed on each of the protrusions.
When at least one of the plurality of protrusions bends and extends in the predetermined direction and the separation direction, the wiring pattern formed on the protrusions is connected to the connecting terminal.
A monitoring device in which a notch (36b) is formed in the protrusion so as to locally narrow the width of the protrusion in a direction intersecting the direction extending from the flexible substrate . The distance in the separation direction between the flexible substrate and the connection point of the wiring pattern in the connection terminal in the state where the flexible substrate is provided on the forming surface is α, and the length of the battery cell in the predetermined direction. The monitoring device according to claim 1, wherein the length of the protrusion extending from the flexible substrate is (α2 + β2) 0.5 or more longer, assuming that half of the portion is β. The monitoring device according to claim 1 or 2 , wherein the protrusions are formed with a plurality of intermittent cuts (36a) arranged in a direction intersecting the direction extending from the flexible substrate of the protrusions. .. The plurality of intermittent cuts are formed in the protrusion so as to cross the wiring pattern formed in the protrusion.
The monitoring device according to claim 3 , wherein the length of the wiring pattern along the formation direction of the cut is longer than the length of one of the cuts along the formation direction . The wiring portion includes the flexible substrate, the protrusion portion, and the first wiring portion (31) and the second wiring portion (32) having the same shape and having the wiring pattern.
The back surface (33b) on the back side of the front surface (33a) of the flexible substrate of the first wiring unit faces the formation surface of the plurality of battery cells, and the first wiring unit is the first electrode terminal group. It is provided on the side of the first electrode terminal group between the second electrode terminal group and the second electrode terminal group.
The surface of the flexible substrate of the second wiring portion faces the formation surface of the plurality of battery cells, and the second wiring portion includes the first electrode terminal group and the second electrode terminal group. The monitoring device according to any one of claims 1 to 4 , which is provided on the side of the second electrode terminal group in between. The connecting terminal is a series terminal (223, 223a to 223h) that connects one of the positive electrode terminals (221) and the other negative electrode terminal (222) of the two battery cells arranged adjacent to each other in a predetermined direction. )
A claim that the wiring pattern formed on the protrusion is connected to a midpoint (CP) between a first connection portion with the positive electrode terminal and a second connection portion with the negative electrode terminal in the series terminal. The monitoring device according to any one of 1 to 5 . The connecting terminal is a series terminal (223, 223a to 223h) that connects one of the positive electrode terminals (221) and the other negative electrode terminal (222) of the two battery cells arranged adjacent to each other in a predetermined direction. )
The series terminal has a connecting portion (225) extending in a predetermined direction and connected to the positive electrode terminal and the negative electrode terminal, a first connection portion between the positive electrode terminal and the positive electrode terminal in the connecting portion, and a first negative electrode terminal. It has a connection portion (226) extending from a midpoint between the two connection portions, and has.
The monitoring device according to any one of claims 1 to 5 , wherein the protrusion is connected to the connection. The monitoring device according to claim 7 , wherein the connecting portion extends from the midpoint of the connecting portion in the separating direction. The monitoring unit has a voltage detection circuit (20) that detects the voltage of the connection terminal.
The wiring pattern is connected to the input terminal of the voltage detection circuit.
The monitoring device according to any one of claims 1 to 8 , wherein the input impedance of the voltage detection circuit has a higher impedance than the output impedance.

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