JP2017199563A - Bus bar module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar module that can flexibly cope with changes in specifications such as the number and mounting positions of temperature sensors.SOLUTION: A bus bar module 10 includes: a sensor mountable area 13 where a thermistor 30 is stored; and a harness storage area 14 where a harness 32 derived from the thermistor 30 is led to a stack end part. The harness storage area 14 comprises a wire routing path formed along the longitudinal direction L of the bus bar module 10, and the sensor mountable area 13 is provided by one area for each battery module 20.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bus bar module.

For example, in an in-vehicle power supply device, a plurality of battery modules are stacked, the terminals of the battery modules are aligned on one surface of the battery stack, and electrical connection is facilitated by connecting the terminals to each other with a bus bar module. .
Further, in this type of bus bar module, a temperature sensor for detecting the temperature of the battery module is provided in the bus bar module (see, for example, Patent Document 1). The output of the temperature sensor is sent to a battery control device, and the battery control device monitors the temperature of the battery module and performs charge / discharge control of the battery.

  Here, in the technique of patent document 1, the electric wire wiring path is used as a space for providing a temperature sensor in a bus-bar module. Thereby, according to the technique described in the document, the temperature sensor is integrated with the bus bar module without providing a dedicated space for mounting the temperature sensor, thereby facilitating the mounting to the battery stack.

JP 2014-22256 A

  However, the conventional bus bar module is a dedicated product prepared for each battery stack, and the arrangement position of the temperature sensor is also limited to the mounting position according to the specifications of the battery stack. Therefore, when changing the number of battery modules or changing the number or mounting position of temperature sensors, the structure of the bus bar module must be changed again. For this reason, there is still room for consideration in quickly responding to various requests of customers.

  Therefore, the present invention has been made paying attention to such problems, and an object of the present invention is to provide a bus bar module that can flexibly cope with changes in specifications such as the number of temperature sensors and mounting positions.

  In order to solve the above-described problem, a bus bar module according to an aspect of the present invention is a bus bar module that is mounted on a battery stack composed of a plurality of battery bodies and connects the battery bodies of the battery stack in series. A sensor mountable area capable of storing a temperature sensor for measuring the temperature of the battery body, and a harness storage area for guiding a harness derived from the temperature sensor to an end of the battery stack, the harness storage area comprising: It is composed of an electric cable routing formed along the longitudinal direction of the bus bar module, and the sensor mountable region is provided for each battery body one by one.

  According to the present invention, since the sensor mountable area is provided for each battery body, a bus bar module that can flexibly cope with a change in specifications such as the number and position of temperature sensors can be provided.

It is a typical perspective view explaining one Embodiment of the battery stack with which the bus-bar module which concerns on 1 aspect of this invention was mounted | worn. 2A and 2B are schematic circuit diagrams of the battery stack of FIG. 1, in which FIG. 1A shows the entire battery stack, and FIG. 1B shows a schematic circuit of one battery module constituting the battery stack. FIG. 2 is a schematic plan view illustrating an embodiment of a bus bar module mounted on the battery stack of FIG. 1, and shows a state where a cover for the bus bar is removed from the battery stack of FIG. 1. It is a typical front view explaining one Embodiment of the module main body which comprises the bus-bar module of FIG. It is a typical top view which shows the principal part of the module main body in FIG. It is a typical top view which shows the principal part of the bus-bar module in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In the present embodiment, an example of a battery stack constituting an in-vehicle power supply device for an electric vehicle will be described. That is, the battery stack of the present embodiment is used as an in-vehicle power supply device, and supplies DC power that is converted into three-phase AC power via an inverter to a motor generator according to a request on the vehicle system side.
Further, the battery stack of the present embodiment stores DC power obtained by converting the three-phase AC power generated by the generator through the inverter when charging is necessary, according to the determination on the system side of the vehicle. However, the electric vehicle includes a hybrid electric vehicle that uses an engine that is an internal combustion engine and an electric motor as a driving source of the vehicle, and a genuine electric vehicle that uses the electric motor as the only driving source of the vehicle.

  Each drawing is schematic. For this reason, it should be noted that the relationship between the thickness and the planar dimension, the ratio, and the like are different from the actual ones, and the dimensional relationship and the ratio are different between the drawings. Further, the following embodiments exemplify apparatuses and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the material, shape, structure, and arrangement of components. Etc. are not specified in the following embodiments.

  As shown in FIG. 1, the battery stack 1 is configured as a lithium ion battery device including a plurality of battery modules 20 formed in the same shape. A bus bar module 10 is mounted on the battery stack 1 on the upper surface in FIG. The bus bar module 10 is entirely covered with a removable bus bar cover 15. Each battery module 20 includes a flat rectangular parallelepiped case 21. A plurality of battery cells 22 (see FIG. 2B), which are flat lithium ion secondary batteries, are accommodated in the case 21.

  In the plurality of battery modules 20, the case side surfaces of the adjacent battery modules 20 are in contact with each other with a slight gap and are arranged in the longitudinal direction L of the bus bar module 10 and overlapped in multiple stages. The longitudinal direction of each battery module 20 (the vertical direction in the figure) is the thickness direction of the bus bar module 10, and the mounting surface 2 (positive electrode terminal shown in FIG. 3) formed on one side of the longitudinal direction of each battery module 20. The surface 2) from which 3 and the negative electrode terminal 5 protrude is flush. The bus bar module 10 is mounted on the mounting surface 2 so as to cover the positive electrode terminal 3 and the negative electrode terminal 5, whereby the battery modules 20 are connected in series using the bus bar module 10.

As shown in FIG. 2A, the battery stack 1 includes a high potential side stack 1L and a low potential side stack 1R. Positive and negative terminals P and N of the left and right stacks 1L and 1R are electrically connected to an external load (for example, an external terminal of an inverter) via a cable (not shown). An SD switch (service disconnect switch) 6 is provided between the left and right stacks 1L and 1R. The SD switch 6 is a safety device for ensuring safety at the time of maintenance and inspection of the battery stack 1, and includes an electrical circuit in which a switch and a fuse are electrically connected in series.

  Each battery module 20 has a plurality of battery cells 22 built in a case 21 as shown in FIG. Each battery cell 22 has a power generation element in which a positive electrode and a negative electrode containing an active material that occludes / releases lithium are stacked via a separator. Each battery cell 22 is a laminated battery in which this power generation element is housed in an insulating exterior body together with an electrolytic solution. Each battery module 20 is configured by connecting a plurality of battery cells 22 in series or in parallel, or a combination of series and parallel. Here, the exterior body may be, for example, a heat-sealed periphery of two laminate films.

In this example, the plurality of battery cells 22 incorporated in each battery module 20 are configured by further connecting two sets of battery cells 22 connected in parallel, as shown in FIG. Each battery module 20 is electrically connected to a battery control device (not shown) via a connection line such as a harness. The battery control device executes processing relating to management and control of the state of the battery stack 1. The processing executed by the battery control device includes measurement of the voltage and current of the battery stack 1, the state of charge (SOC) and the deterioration state (SOC) of the battery stack 1.
H: State Of Health) and the temperature measurement of each battery module 20
Measurement of the voltage of each battery cell, adjustment processing of the storage amount of each battery cell, and the like are executed.

  Each battery module 20 includes a positive electrode terminal 3 for deriving the highest potential of a plurality of battery cells 22 connected in a predetermined manner and a negative electrode terminal 5 for deriving the lowest potential to the outside. It is exposed and provided. In the present embodiment, an intermediate terminal 4 for taking out an intermediate potential is provided at the center of each battery module 20. Thereby, in each battery module 20, the positive electrode terminal 3, the negative electrode terminal 5, and the intermediate terminal 4 are arranged in a projecting state from one mounting surface 2 in the longitudinal direction. When viewed from the terminal side of each battery module 20, the battery stack 1 has the positive terminals 3 and the negative terminals 5 alternately arranged in each battery module 20.

  All the battery modules 20 are connected in series by a bus bar module 10 as shown in FIG. In the example of the present embodiment, the high potential side stack 1L and the low potential side stack 1R are connected in series by the two bus bar modules 10 so as to cover the terminal portions of the respective stacks. In this example, a removable cover 15 is attached to each of the left and right stacks 1L, 1R of the bus bar modules 10.

  Each bus bar module 10 includes a module body 11 formed of an insulating material (for example, an insulating synthetic resin). As shown in the figure, a plurality of bus bars 12 are integrally fitted into the module body 11 at predetermined positions. The bus bar 12 is a flat metal member having a rectangular shape. Each bus bar 12 is connected to each of adjacent terminals 3 and 5 of each battery module 20 when the bus bar module 10 is mounted on the battery stack 1, so that the battery modules 20 can be efficiently and integrally connected in series. It has become.

  Here, the module main body 11 of the present embodiment includes a plurality of unit modules 11 </ b> A and 11 </ b> B corresponding to the respective battery modules 20 constituting the battery stack 1. The plurality of unit modules 11B have a split structure in which one of the unit modules adjacent to each other can be attached to and detached from each other even when the unit modules 11B are rotated by 180 ° along the mounting surface 2.

Specifically, as shown in FIG. 4, each of the left and right stacks 1L and 1R is composed of a set of a total of 5 unit modules, and the stack 1 as a whole is composed of a total of 10 unit modules.
In the present embodiment, the first unit module 11A for deriving the positive terminal P and the negative terminal N is used on both sides of the left and right stacks 1L, 1R. In addition, the second unit module 11B having an engagement structure that can be assembled in a posture rotated by 180 ° along the mounting surface 2 with respect to the adjacent unit modules 11A and 11B is used in the other portions. Yes.

  In the figure, in the unit module 11A, the reference posture is denoted by reference numeral 11A1, and the posture rotated by 180 ° along the mounting surface 2 is denoted by reference numeral 11A2. Similarly, in the unit module 11B, the reference posture is denoted by reference numeral 11B1, and the posture rotated by 180 ° along the mounting surface 2 is denoted by reference numeral 11B2.

  Here, in this bus bar module main body 10, as shown in a plan view of a portion to be mounted on the high-potential side stack 1 </ b> L, a sensor mountable region (temperature sensor installation portion) 13, a harness storage region, 14 are integrally formed by injection molding or the like. The harness storage area 14 also serves as a wiring path for voltage detection wires (not shown) of the battery module 20, and is formed in a concave groove having a substantially rectangular cross section along the longitudinal direction L of the bus bar module 10. The

  In the drawing, the outer peripheral shape of each unit module is indicated by “thin solid line”, and the wall surface part (the part having height) integrally formed by injection molding or the like is indicated by “thick solid line”. In addition, three circles for each unit module indicated by “thin solid lines” are opposed to the two through holes Th formed at positions facing the positive terminal 3 or the negative terminal 5 and the middle terminal 4 at the center, respectively. The through-hole 4h formed at the position is shown, and the floor portion is shown except for the wall portion and the portion where the through-hole is formed. The low-potential side stack 1R is omitted from the illustration because it has a shape reversed in the left-right direction with respect to the high-potential side stack 1L.

  As shown in the figure, the harness storage area 14 of the present embodiment is formed from a two-wire electric wire routing path formed so as to sandwich the through hole 4h facing the intermediate terminal 4 along the longitudinal direction L of the bus bar module 10. Become. In other words, as shown in FIG. 3, each harness storage area 14 is formed at the position between the intermediate terminal 4 and the positive electrode terminal 3 and the negative electrode terminal 5 along the arrangement direction of the battery modules 20. As a result, the two harness storage areas 14 are arranged so that the intermediate terminals 4 are arranged on both upper and lower sides (both sides in the width direction of the bus bar module 10) along the arrangement direction of the plurality of intermediate terminals 4 provided in the center of the battery module 20. It is formed so as to be sandwiched between.

  Further, as shown in FIG. 5, the sensor mountable region 13 has a substantially rectangular concave groove in a cross section perpendicular to the longitudinal direction L, and faces each intermediate terminal 4 of all the battery modules 20. One is provided for each of the positions of the through holes 4 h, and the other end side is provided so as to be continuous with one of the two harness storage areas 14. In particular, in this embodiment, the sensor mountable region 13 is a case where the adjacent unit modules 11A and 11B are assembled in any posture before and after being rotated 180 ° along the mounting surface 2. However, it is formed so as to be provided with respect to the position of the intermediate terminal 4 of each battery module 20.

In the sensor mountable region 13, for example, a temperature sensor that detects the temperature of the battery module 20 is stored at a position according to the specification, as shown by an alternate long and two short dashes line in FIG. 6. The temperature sensor of this embodiment is a thermistor 30. The thermistor 30 of this embodiment has a washer type mounting portion as the mounting portion 33 at one end. The thermistor 30 has a specification in which two leads led out in parallel from a thermistor element built in the sensor body 31 are connected to a core wire in the harness 32 at the other end of the sensor body 31.

  Each sensor mountable region 13 is formed such that the end of the sensor body 31 on the harness 32 side of the stored thermistor 30 is continuous with the harness storage region 14. The mounted thermistor 30 is connected at one end to the intermediate terminal 4 and the harness 32 led out from the other end is connected to a battery control device (not shown) via the harness storage area 14. In the example shown in FIG. 3, an example is shown in which the thermistors 30 are attached to all the battery modules 20 constituting the battery stack 1, but the number, attachment positions, and the like of the thermistors 30 depend on the specifications. Mounted as appropriate.

  That is, since the sensor mountable area of the present embodiment is provided for each battery module, if the required specification is to mount the thermistor 30 on all battery modules 20, As shown in FIG. 3, the thermistor 30 can be attached to all the battery modules 20. Further, if the required specification is to attach the thermistor 30 to any one of the battery modules 20, the structure of the bus bar module can be configured by using the sensor attachable area corresponding to that as shown in FIG. The number and mounting position of the thermistor 30 can be changed according to the required specifications without changing them.

Here, as shown in FIG. 4, in each sensor mountable region 13, the direction of the lead center line CL of the thermistor 30 in the mounted state is arranged obliquely from the intermediate terminal 4 side toward the harness storage region 14. The lead center lines CL are arranged in parallel to the sensor mountable region 13 of the adjacent battery module 20. In the example shown in the figure, the obliquely arranged angle is 45 ° with respect to the longitudinal direction L.
In the figure, the upper edge of each unit module 11A, 11B is indicated by a thick solid line, the image of the lead center line CL of the thermistor 30 in the mounted state is indicated by a one-dot chain line, and the thermistor 30 shown in FIG. The necessary number of thermistors 30 (two places in this example) mounted in accordance with the specifications are shown as two-dot chain lines.

Next, the effect of the battery stack 1 to which the above-described bus bar module 10 is mounted will be described.
In the battery stack 1 described above, a required number of thermistors 30 corresponding to the specifications are provided in close contact with the intermediate terminal 4 of the battery module 20 corresponding to the specifications (for example, see the image of the thermistor indicated by a two-dot chain line in FIG. 4). ). Each thermistor 30 is connected via a harness 32 to a temperature detection circuit (not shown) built in a battery control device (not shown) that monitors the battery stack 1. The battery control device monitors the temperature of the battery module 20 with the thermistor 30 as needed. The battery control device calculates the maximum temperature, the minimum temperature, the average temperature, and the like from the detection value of the thermistor 30 to monitor the state of each battery module 20, and manages and controls it. The charge / discharge control information such as the current state and allowable charge / discharge power is notified.

  Here, if the bus bar module is a dedicated product prepared for each battery stack, the position of the thermistor 30 is also limited to the mounting position according to the specifications of the battery stack. Therefore, when changing the number of battery modules 20 or changing the number or mounting position of the thermistors 30, the structure of the bus bar module must be changed again.

On the other hand, according to the bus bar module 10 of the present embodiment, the harness storage area 14 is composed of an electric cable routing path formed along the longitudinal direction L of the bus bar module 10, and the sensor mountable area 13 includes each battery. Since one thermistor 30 is provided for each module, the thermistor 30 can be installed in each battery module 20, and the harness 32 is led out to the harness storage area 14 in any position. Can do. Therefore, even if the specification change occurs in the number or position of the thermistor 30 according to the customer's request, the specification change can be easily handled.

  Further, when the thermistor 30 is connected to the terminals 3 and 5 through which the current of the battery module 20 flows, there is a problem that the temperature detection accuracy by the thermistor 30 is reduced because the fluctuation of the current increases. On the other hand, the bus bar module 10 of this embodiment has the intermediate terminal 4 in which the battery module 20 takes out the halfway potential of the battery module 20 at a position between the positive and negative terminals 3 and 5, and the thermistor 30 has one end. Since the mounting portion 33 is connected to the intermediate terminal 4 and the harness 32 led out from the other end is connected to the battery control device, according to the bus bar module 10 of the present embodiment, the intermediate terminal 4 of each battery module 20 is connected. However, since the intermediate potentials of the plurality of battery cells 22 stored in the battery module 20 are connected, the temperature detection accuracy by the thermistor 30 is improved.

  Furthermore, according to the bus bar module 10 of the present embodiment, the harness storage region 14 is composed of two wire wiring paths formed so as to sandwich the intermediate terminal 4 from both sides along the longitudinal direction L of the bus bar module 10. The sensor mountable area 13 is provided with respect to the positions of the intermediate terminals 4 of all the battery modules 20, and the other end side is provided so as to be continuous with either one of the two harness storage areas 14. A thermistor 30 can be installed in the sensor mountable region 13 of the battery module 20. And even if it is the thermistor 30 installed in which position, the harness 32 can be connected to a battery control apparatus via either one of the two harness storage areas 14. FIG. Therefore, it can be said that the configuration is excellent in dealing with the specification change easily and quickly even when the specification change occurs in the number of thermistors 30 or the mounting position according to the customer's request.

  Further, according to the bus bar module 10 of the present embodiment, the thermistor 30 has a washer-type mounting portion 33 as a mounting portion at one end, and two leads led out from the thermistor element of the thermistor 30 are connected to the harness 32. Each sensor mountable area 13 is formed so that the direction of the lead center line CL of the thermistor 30 in the mounted state is obliquely arranged from the intermediate terminal 4 side toward the harness storage area 14 and adjacent to each other. The sensor module mountable region 13 of the battery module 20 is formed such that the mutual lead center lines CL are arranged in parallel, so that a large number of thermistors 30 can be mounted at the positions of the intermediate terminals 4 of all the battery modules 20. It is suitable when it is set as a simple structure.

  In particular, according to the bus bar module 10 of the present embodiment, the bus bar module 10 is composed of a set of unit modules 11A and 11B corresponding to the respective battery modules 20, and unit modules adjacent to each other are 180 along the mounting surface 2. ° Since the split structure is detachable even in a rotated position, the unit modules 11A and 11B can be easily increased or decreased. Therefore, the number of battery modules 20, the number of thermistors 30 according to the customer's request, the mounting position, etc. Even when a specification change occurs, the specification change can be easily handled.

  The sensor mountable regions 13 are formed in parallel with each other so that the unit modules 11A and 11B can be assembled in any posture before and after rotating the unit modules 11A and 11B along the mounting surface 2. Even if it is a case, the several sensor mounting | wearing area | region 13 can always be ensured for every battery module 20. FIG. Therefore, it is extremely excellent as a configuration that can flexibly cope with a change in specifications such as the number and position of the thermistors 30.

The bus bar module according to the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the said embodiment, although the battery stack 1 comprised from a lithium ion secondary battery was illustrated, this invention is not limited to this. In addition to the lithium ion secondary battery, the present invention can also be applied to a battery stack 1 including other secondary batteries such as a nickel metal hydride battery.

  Further, the battery stack 1 according to the above-described embodiment is used as a power source for vehicles such as other electric vehicles, for example, railway vehicles such as hybrid trains, passenger cars such as buses, cargo vehicles such as trucks, and industrial vehicles such as battery-type forklift trucks. It can also be used for a device. In addition, the battery stack 1 according to the above-described embodiment is applied to a battery pack that constitutes a power supply device other than an electric vehicle, such as an uninterruptible power supply device used in a computer system or a server system, a power supply device used in a private power generation facility. May be.

  In the embodiment described above, the high potential side stack 1L and the low potential side stack 1R are connected in series. However, the high potential side stack 1L and the low potential side stack 1R are connected in parallel. Alternatively, a plurality of high potential side stacks 1L and low potential side stacks 1R may be connected in combination of series and parallel.

Further, in the above-described embodiment, as the battery module 20, two circuits in which two battery cells 22 are connected in parallel are prepared, and these are connected in two parallel two-line connection in series, but not limited to the battery module 20, One battery cell may be used instead of one battery module 20.
For example, a general prismatic battery or a cylindrical battery may be used, and a positive and negative electrode terminal of a laminate film type battery cell may be protruded from one side and a spacer for fixing the terminal may be used. A plurality of battery cells may be arranged side by side so that the terminals are aligned on one side and electrically connected to the bus bar of the bus bar module.

DESCRIPTION OF SYMBOLS 1 Battery stack 2 Mounting surface 3 Positive terminal 4 Intermediate terminal 5 Negative terminal 6 SD switch 10 Bus bar module 11 Module main body 11A, 11B Unit module 12 Bus bar 13 Sensor mounting area 14 Harness storage area 15 Cover 20 Battery module (battery body)
21 Case 22 Battery cell 30 Thermistor (temperature sensor)
31 Sensor body 32 Harness 33 Washer-type mounting part CL Lead center line

Claims (4)

A bus bar module that is mounted on a battery stack composed of a plurality of battery bodies and connects the battery bodies of the battery stack in series,
A sensor mountable area capable of storing a temperature sensor for measuring the temperature of the battery body, and a harness storage area for guiding a harness derived from the temperature sensor to an end of the battery stack,
The harness storage area is composed of an electric cable routing formed along the longitudinal direction of the bus bar module,
The sensor bar mountable area is provided for each battery module at one location. The battery body is a battery module composed of a plurality of battery cells, and has an intermediate terminal for taking out an intermediate potential of the battery module at a position between a positive electrode terminal and a negative electrode terminal, and the temperature sensor has one end The harness is connected to the intermediate terminal and the harness led out from the other end is connected to the battery control device,
The harness storage area is composed of two wire wiring paths formed on both sides of the intermediate terminal so as to sandwich the intermediate terminal along the longitudinal direction of the bus bar module.
The sensor mountable area is provided for each of the positions of the intermediate terminals of all battery modules, and the other end side is provided so as to be continuous with one of the two harness storage areas. The bus bar module according to 1. The temperature sensor is a thermistor having a washer type mounting portion as the mounting portion at the one end, and a lead led out from the thermistor element of the thermistor is connected to the harness led out from the other end,
Each sensor mountable region is formed such that the direction of the lead centerline of the thermistor in the mounted state is obliquely arranged from the intermediate terminal side toward the harness storage region, and between the adjacent battery modules The bus bar module according to claim 2, wherein the lead center lines are arranged in parallel to the sensor mountable region. The bus bar module is composed of a plurality of unit modules corresponding to each battery module constituting the battery stack,
The plurality of unit modules have a split structure in which one of adjacent unit modules can be attached to and detached from each other even if the unit modules are rotated by 180 ° along the mounting surface of the bus bar module.
The sensor mountable region is formed so as to be provided for each of all battery modules regardless of whether the adjacent unit modules are assembled in any posture before and after being rotated by 180 °. The bus bar module according to claim 1.

Images