JP2016158368A - Battery pack system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide information for maintaining stable battery performance for a long period by using an usable electric cell without waste.SOLUTION: A battery pack system 1 comprises: a battery pack 2 structured by relatively connecting a plurality of battery modules 4 arranged to a base plate 6; a sensor part 40 measuring a discharge power of the plurality of battery modules 4; and a processing part 3 calculating a capacity C as a degree of deterioration of the plurality of battery modules 4 on the basis of measurement information (SOC, a current value, a voltage value) indicating a measurement result of the sensor part 40. The plurality of battery modules 4 is detachably disposed to a predetermined position on the base plate 6, and the processing part 3 calculates the degree of deterioration of the battery pack 2 on the basis of the degree of deterioration of the plurality of battery modules 4, and outputs information indicating the degree of deterioration of the battery pack 2.SELECTED DRAWING: Figure 7

Description

  The present invention relates to an assembled battery system including an assembled battery configured by connecting a plurality of single cells.

A solar power generation system or the like installed in an electric vehicle, a hybrid vehicle, a house, or the like usually includes a livestock battery for storing electric power.
As the storage battery, an assembled battery configured by connecting a plurality of single cells made of secondary batteries is used (see, for example, Patent Document 1).

JP 2002-142370 A

In the assembled battery, each of the plurality of single cells has a variation in performance, and the degree of deterioration varies depending on the environment at the position when the cells are arranged as an assembled battery.
For this reason, when the assembled battery is continuously used, not all of the plurality of single cells constituting the assembled battery are deteriorated with time in the same manner, and single cells having different degrees of deterioration are mixed. .

Here, if even one of the plurality of unit cells is extremely deteriorated, the battery performance of the assembled battery as a whole is deteriorated by being dragged by the performance of the unit cell having the most deterioration. In addition to this, charging and discharging losses are caused in the cells that are relatively not deteriorated, and the deterioration of the cells that are not relatively deteriorated is also promoted.
As described above, when even one of the plurality of unit cells is relatively deteriorated, the life of the assembled battery may be reduced due to this.

  Therefore, when there is a relatively deteriorated unit cell in the assembled battery, the relatively deteriorated unit cell is changed to an array position in an environment where the deterioration is less likely to proceed, or a new one. It is considered effective to take measures such as replacing the

However, the plurality of single cells constituting the assembled battery are usually packaged as a single assembled battery, with connecting members connecting the electrode terminals attached by welding or brazing. is there.
For this reason, when battery performance deteriorates as a whole assembled battery, regardless of the degree of deterioration of individual cells constituting the assembled battery, it is exchanged as having reached the life of the assembled battery as a whole. The assembled battery may be discarded.
In this case, even a single cell that can still be used is replaced or discarded, resulting in waste.

  The present invention has been made in view of such circumstances, and an assembled battery system that can use usable cells without waste and can provide information for maintaining stable battery performance over a long period of time. The purpose is to provide.

(1) An assembled battery system according to the present invention includes an assembled battery configured by connecting a plurality of battery modules arranged on a base plate to each other, and a measurement unit that measures charge / discharge power of each of the plurality of battery modules. And a processing unit that obtains the degree of deterioration of each of the plurality of battery modules based on a measurement result of the measurement unit, and the plurality of battery modules are detachably arranged at predetermined positions on the base plate, respectively. The processing unit obtains the degree of deterioration of the assembled battery based on the degree of deterioration of each of the plurality of battery modules, and outputs information indicating the degree of deterioration of the assembled battery.

According to the assembled battery system configured as described above, since a plurality of battery modules are detachably arranged, a user using the assembled battery system replaces the battery modules arranged on the base plate. Can be rearranged.
Therefore, by outputting information indicating the degree of deterioration of the assembled battery to the user, the user is encouraged to rearrange by replacing a new battery module or replacing a plurality of battery modules. The life of the assembled battery can be maintained while using a plurality of battery modules. Thus, according to the present invention, it is possible to provide information for using a usable battery module without waste and maintaining stable battery performance over a long period of time.

(2) In the assembled battery system, it is preferable that the processing unit obtains the remaining life of each of the plurality of battery modules as the degree of deterioration, thereby obtaining the remaining life of the assembled battery as the degree of deterioration.
In this case, it is possible to grasp the future deterioration tendency of the plurality of battery modules and the assembled battery.

(3) Moreover, the said measurement part can measure the temperature of each of these battery modules, and the said process part is based on the measurement result and temperature of each charging / discharging electric power of each of these battery modules. It is preferable to determine the degree of deterioration of each battery module.
The lifetime of the battery module, that is, the degree of future deterioration depends on the temperature. Therefore, in this case, the processing unit can determine the remaining lifetimes of the plurality of battery modules and the assembled battery with higher accuracy by considering the temperature in addition to the measurement result of the charge / discharge power.

(4) The processing unit may identify a battery module to be replaced based on a degree of deterioration of each of the plurality of battery modules, and output information indicating the identified battery module.
In this case, the battery module that can reduce the deterioration degree of the assembled battery can be easily replaced.

(5) Further, the processing unit includes:
Based on the degree of deterioration of each of the plurality of battery modules, the method of replacing each of the one or more battery modules that can reduce the degree of deterioration of the assembled battery is specified, and the method of replacing the one or more battery modules is determined. It is preferable to output the indicated information.
In this case, the battery module can be easily replaced such that the degree of deterioration of the assembled battery is effectively reduced by the information indicating the replacement method output by the processing unit.
The replacement of one or a plurality of battery modules includes replacement with a new battery module and replacement of the battery modules 4 for rearranging the plurality of arranged battery modules 4.

(6) In the assembled battery system, each of the plurality of battery modules includes a plurality of unit cells connected to each other by a conductive member that is welded and fixed, and a housing that houses the plurality of unit cells. The battery module may include electrodes that are positive and negative electrodes of the battery module provided on the body, and the electrodes may be connected to electrodes of other battery modules by pressure bonding.
In this case, the battery modules connected to each other can be easily disconnected, rearranged, and easily reconnected.

(7) Further, the processing unit includes:
A management unit for acquiring position information for specifying a position in the base plate in which the plurality of battery modules are arranged;
Information indicating the specified battery module or information indicating how to replace each of the plurality of battery modules may be represented by the position information.
(8) Further, in this case, each of the plurality of battery modules includes an identification information output unit that outputs identification information for identifying the plurality of battery modules.
The information processing apparatus may further include a receiving unit that receives the identification information output by the identification information output unit and associates the identification information with the position information of the battery module corresponding to the identification information and applies the position information to the management unit. .
In this case, since the reception unit associates the identification information of the plurality of battery modules and the position information of the battery module corresponding to the identification information and provides them to the management unit, the battery modules specified by the identification information are arranged. The position can be easily specified.

(9) Moreover, this invention is an assembled battery system provided with the assembled battery comprised by connecting several battery modules mutually,
Each of the plurality of battery modules is composed of a plurality of unit cells connected to each other by welding and fixing the conductive member to the electrode terminal, and the battery module is provided in a casing that houses the plurality of unit cells. The module is provided with electrodes to be a positive electrode and a negative electrode, and the electrodes are connected to each other by pressure bonding.
According to the above configuration, the battery modules connected to each other can be easily disconnected, rearranged, and easily reconnected.

(10) Furthermore, the present invention is an assembled battery system including an assembled battery configured by connecting a plurality of battery modules arranged on a base plate to each other,
A management unit that acquires position information for specifying a position on the base plate on which the plurality of battery modules are arranged;

(11) In the assembled battery system, each of the plurality of battery modules includes an identification information output unit that outputs identification information for identifying the plurality of battery modules.
The apparatus further includes a receiving unit that receives the identification information output from the identification information output unit, and associates the identification information with the position information of the battery module corresponding to the identification information and supplies the position information to the management unit. preferable.
In this case, since the reception unit associates the identification information of the plurality of battery modules with the position information of the battery module corresponding to the identification information and provides the management unit, the battery modules specified by the identification information are arranged. The position can be easily specified.

  ADVANTAGE OF THE INVENTION According to this invention, the information for maintaining the stable battery performance over a long period of time can be provided, without using a usable unit cell efficiently.

It is an external view of an assembled battery system. It is a figure which shows the structure of a battery module. It is a figure which shows the connection aspect of battery modules. (A) is the figure which showed the state before a battery module was attached to a base board, (b) is the figure which showed the state in which the battery module was attached to the base board, and was hold | maintained. It is a figure which shows the signal path | route of a process part and the sensor part of a battery module. It is a circuit diagram of a battery module and a sensor part. It is a block diagram which shows the functional structure of a process part. It is a figure which shows an example of the positional information allocated with respect to the position on a base board. It is a flowchart which shows the procedure of the degradation degree evaluation process which a process part performs. It is a graph for demonstrating how to obtain | require the remaining lifetime estimated value which a remaining lifetime estimation part performs. It is a figure which shows an example of the new arrangement | sequence position which the arrangement | sequence specific part calculated | required.

Hereinafter, preferred embodiments will be described with reference to the drawings.
[About overall system configuration]
FIG. 1 is an external view of an assembled battery system. In the figure, the assembled battery system 1 includes an assembled battery 2 and a processing unit 3.

The assembled battery 2 includes a plurality of battery modules 4 and a housing 5 that houses the plurality of battery modules 4. In FIG. 1, a part of the housing 5 is cut away.
Each battery module 4 is arranged at a predetermined position in the housing 5. In the illustrated example, 16 battery modules are arranged vertically and horizontally and arranged in a grid.
As will be described later, each battery module 4 includes a single battery composed of one or a plurality of secondary batteries, and each constitutes a storage battery having a predetermined capacity. Each battery module 4 is connected to each other in parallel or in series by a connection member 20 and a connection bar 9. The assembled battery 2 is configured as a storage battery by connecting and combining a plurality of battery modules 4 to each other.
An electrode terminal (not shown) of the assembled battery 2 is provided at the distal end portion 9a of the connection bar 9 that connects the positive electrode ends (negative electrode ends) of the plurality of battery modules 4 connected in series. .

The housing 5 includes a base plate 6 that holds the plurality of battery modules 4 and a cover 7 that covers the plurality of battery modules 4 on the base plate 6.
The base plate 6 removably holds each battery module 4 at a predetermined position in the housing 5. The base plate 6 is connected to a sensor unit (described later) provided in the battery module 4 and the processing unit 3.
The base plate 6 has a function for receiving the output from the sensor unit and giving it to the processing unit 3.

  The cover 7 is provided on the upper surface side of the base plate 6, covers the plurality of battery modules 4, stores the plurality of battery modules 4 in the housing 5, and protects the plurality of battery modules 4 from the external environment. .

The processing unit 3 is connected to the assembled battery 2 by a communication cable 8 extending from the assembled battery 2, and performs a process of obtaining a deterioration level such as a current capacity of the assembled battery 2 and a life prediction.
The processing unit 3 is configured by a microcomputer including a processor, a storage unit such as a ROM or a RAM, and an input / output unit. In addition to the operating system for operating the processing unit 3, the storage unit stores a computer program for realizing the functions of the processing unit 3 described later.

[Battery module]
FIG. 2 is a diagram illustrating a configuration of the battery module 4.
As shown in FIG. 2, the battery module 4 includes a plurality of unit cells 10 (four in the illustrated example) and a case 11 that houses the plurality of unit cells 10.
Each unit cell 10 is, for example, a lithium ion battery, and is connected in series by a conductive member 12 formed of a copper plate, an aluminum alloy plate, or the like.
The conducting member 12 has one end welded and fixed to the electrode terminal 10a (positive electrode terminal) of the unit cell 10, and the other end welded and fixed to the electrode terminal 10a (negative electrode terminal) of another unit cell. Thereby, each unit cell 10 is connected in series by the conducting member 12 welded and fixed to the electrode terminal 10a.

A first electrode tab 13 serving as a positive electrode of the battery module 4 is welded to the electrode terminal 10b constituting the positive electrode end of the plurality of unit cells 10 group connected in series.
In addition, a second electrode tab 14 serving as a negative electrode of the battery module 4 is welded to the electrode terminal 10c constituting the negative electrode end of the plurality of unit cells 10 group connected in series.

The first electrode tab 13 and the second electrode tab 14 are plate-like members formed of a copper plate, an aluminum alloy plate, or the like, projecting from the inside of the case 11 to the outside, and exposed to the outside of the case 11. Is provided.
Moreover, the hole 13a and the hole 14a for inserting the crimping | compression-bonding bolt mentioned later are provided in the front-end | tip part of the 1st electrode tab 13 and the 2nd electrode tab 14. As shown in FIG.

The electrode tabs 13 and 14 of each battery module 4 are connected to the electrode tabs 13 and 14 of other battery modules 4. Thereby, the battery modules 4 are connected to each other.
FIG. 3 is a diagram illustrating a connection mode between the battery modules 4.
As shown in FIG. 3, the first electrode tab 13 of the battery module 4 is connected to the second electrode tab 14 of another adjacent battery module 4 via the connection member 20.
The connection member 20 is a plate-like member formed of a copper plate, an aluminum alloy plate, or the like.
In one end portion 20 a of the connection member 20, a hole portion through which the bolt 21 attached to the distal end portion of the first electrode tab 13 can be inserted is formed. The one end 20a of the connecting member 20 and the first electrode tab 13 are both fastened and fastened together by tightening the nut 22 with the bolt 21 inserted therethrough.

Similarly to the one end portion 20a, the other end portion 20b of the connecting member 20 is formed with a hole through which the bolt 21 can be inserted. The other end portion 20b of the connecting member 20 and the second electrode tab 14 are both fastened and fastened together by fastening the nut 22 with the bolt 21 inserted therethrough.
As described above, the electrode tabs 13 and 14 are connected to the electrode tabs 13 and 14 of the other battery modules 4 through the connection members 20 that are crimped to the electrode tabs 13 and 14.
Thus, since each battery module 4 is connected by the connection member 20 crimped to the electrode tabs 13 and 14, the battery modules 4 connected to each other can be easily separated and rearranged easily. You can reconnect.

  The electrode tabs 13 and 14 of the battery module 4 shown in FIGS. 2 and 3 are both the upper surface edge of the case 11 and are illustrated as protruding from the same edge. For example, in FIG. As in the battery module 4 connected to the connection bar 9, the electrode tabs 13 and 14 may be protruded from different edges, or the electrode tab 13 is provided on one edge and the electrode is provided on the opposite edge. A tab 14 may be provided. In addition, the electrode tabs 13 and 14 may protrude from the lower side of the case 11, or may be provided along the outer surface of the case 11 as long as crimping is possible.

FIG. 4A is a diagram showing a state before the battery module 4 is attached to the base plate 6.
As shown in FIG. 4A, the base plate 6 is formed with a holding recess 25 for holding the battery module 4. The holding recess 25 is formed to be recessed in a rectangular shape with respect to the upper surface 6 a of the base plate 6. The holding recess 25 is sized such that the battery module 4 can be inserted therein, and holds the battery module 4 inserted inside the holding recess 25.
The holding recesses 25 are provided in the housing 5 in accordance with the arrangement positions of the battery modules 4, and each battery module 4 is positioned at a predetermined position in the housing 5 by being inserted and held in the holding recesses 25. .

  In the present embodiment, as described above, the 16 battery modules are arranged vertically and horizontally and arranged in a lattice pattern. Therefore, 16 holding recesses 25 are formed on the upper surface 6 a of the base plate 6 corresponding to the position of the battery module 4.

A first connector 30 is provided on the case 11 of the battery module 4.
The first connector 30 is connected to a sensor unit (described in detail later) for measuring the state of the battery module 4 provided in the case 11 of the battery module 4 and outputs a signal from the sensor unit.

A second connector 31 that can be connected to the first connector 30 is provided on the upper surface 6 a of the base plate 6 corresponding to each holding recess 25. The second connector 31 is provided at the edge 26 of each holding recess 25 on the upper surface 6a, and is provided at a position to be connected to the first connector 30 when the battery module 4 is inserted and held in the holding recess 25. ing.
The second connector 31 is connected to the processing unit 3 (FIG. 1) via a communication path (not shown). Therefore, a signal from the sensor unit is given from the second connector 31 to the processing unit 3 through the communication path.

FIG. 4B is a diagram showing a state in which the battery module 4 is attached to and held on the base plate 6.
As shown in FIG. 4B, the first connector 30 and the second connector 31 are connected to each other with the battery module 4 inserted and held in the holding recess 25.
Thus, if the battery module 4 is inserted and held in the holding recess 25, the first connector 30 and the second connector 31 are connected to each other.

The first connector 30 of each battery module 4 arranged on the base plate 6 is connected to the second connector 31 provided at the edge 26 of the holding recess 25 in which the battery modules 4 are arranged.
Therefore, all the sensor units included in each battery module 4 are connected to the processing unit 3.

FIG. 5 is a diagram illustrating a signal path between the processing unit 3 and the sensor unit of the battery module 4.
As shown in FIG. 5, a sensor unit 40 is connected to the first connector 30 of each battery module 4.
The plurality of second connectors 31 corresponding to the plurality of battery modules 4 are sequentially connected to the signal path 33, and the processing unit 3 is connected to the end of the signal path 33.
A flip-flop 35 is connected to the subsequent stage of each second connector 31.
The processing unit 3 gives a clock signal to each flip-flop 35. Thus, the signals output from the sensor units 40 are sequentially given to the processing unit 3.
That is, the signal path 33 and each flip-flop 35 constitute a shift register.

Further, since the signal given to the processing unit 3 is given from the signal path 33 and each flip-flop 35 constituting the shift register, the signal is sequentially sent from the sensor unit 40 connected to the position closest to the processing unit 3. Is given.
Therefore, by associating the relationship between the connection order of each second connector 31 and the position on the base plate 6, the processing unit 3 outputs the signal according to the order in which the signal is given. The position of the part 40 on the base plate 6 can be specified.

FIG. 6 is a circuit diagram of the battery module 4 and the sensor unit 40.
As shown in FIG. 6, the battery module 4 has a plurality of single cells 10 (four in the illustrated example) connected in series. A first electrode tab 13 is provided at the positive electrode end of the plurality of unit cells 10 connected in series. A second electrode tab 14 is provided at the negative electrode end of the plurality of unit cells 10 connected in series.

  The sensor unit 40 includes a current sensor 41 for measuring a current value of DC power discharged from the battery module 4, a voltage sensor 42 for measuring a voltage between terminals of the battery module 4, and an internal temperature of the battery module 4. The temperature sensor 43 for measuring, the control part 44 which performs the process regarding the state measurement of the battery module 4, and the memory | storage part 45 for memorize | storing various information are provided.

The current sensor 41 measures the current value of DC power when the battery module 4 is charged and discharged, and gives a signal indicating the measurement result to the control unit 44.
The voltage sensor 42 measures the voltage value of DC power when the battery module 4 is charged and discharged, and gives a signal indicating the measurement result to the control unit 44.
The temperature sensor 43 measures the current temperature inside the battery module 4 and gives a signal indicating the measurement result to the control unit 44.
That is, the sensor unit 40 has a function of measuring the charge / discharge power of the battery module 4 and measuring the internal temperature of the battery module 4.

  The control unit 44 estimates a state of charge (SOC) that is a value indicating the remaining amount of charge of the battery module 4 based on signals given from the sensors 41, 42, and 43. Further, the control unit 44 generates information indicating measurement values obtained by the sensors 41, 42, and 43 based on signals given from the sensors 41, 42, and 43. Further, the control unit 44 generates a measurement signal including information indicating the estimated SOC and information indicating measurement values obtained by the sensors 41, 42, and 43, and passes through the first connector 30 and the second connector 31. Output to the processing unit 3.

The storage unit 45 stores unique ID information (identification information) given to each battery module 4.
The control unit 44 adds ID information to the generated measurement signal, and outputs the measurement signal to which the ID information is added toward the processing unit 3.

  Therefore, the processing unit 3 refers to the ID information added to the measurement signal given from the sensor unit 40, and which battery module 4 indicates the measurement result of the given measurement signal. I can grasp it.

[About the processing section]
FIG. 7 is a block diagram showing a functional configuration of the processing unit 3.
As shown in FIG. 7, the processing unit 3 includes a management unit 50, a capacity calculation unit 51, a replacement module specification unit 52, an output unit 53, a remaining life estimation unit 54, an array specification unit 55, and a database DB. Functionally.

  The management unit 50 has a function of acquiring position information for specifying the position on the base plate 6 on which the battery modules 4 are arranged.

FIG. 8 is a diagram illustrating an example of position information assigned to a position on the base plate 6.
As shown in FIG. 8, position numbers “1” to “16” are assigned as unique position information to each position on the base plate 6 for arranging the 16 battery modules 4. Yes.
The management unit 50 stores a correspondence relationship between each position number and each position on the base plate 6 in advance. Therefore, the management unit 50 can specify the arrangement position of the battery modules 4 by acquiring the position number.

The management unit 50 is connected to the sensor unit 40 of each battery module 4 and is given a measurement signal from each sensor unit 40.
Here, the 2nd connector 31 provided corresponding to each position on base board 6 is connected to signal course 33 (Drawing 5) according to the order of a position number.
That is, the second connector 31 provided at the position of the position number “1” is connected to the position closest to the processing unit 3 in the signal path 33, and thereafter the second connector at the position of the position number “2” in order. 31 is connected to the second connector 31 at the position of the position number “3”, and the second connector 31 at the position of the position number “16” is connected to the position farthest from the processing unit 3 in the signal path 33. Yes.

  As described above, since the signal given to the processing unit 3 is given from the signal path 33 and each flip-flop 35 constituting the shift register, from the sensor unit 40 connected to the position closest to the processing unit 3. Signals are given in order.

  Therefore, among the plurality of measurement signals sequentially given to the management unit 50 by giving the clock signal to the flip-flop 35, the first measurement signal given is connected to the second connector 31 at the position of the position number “1”. The second measurement signal given by the sensor unit 40 is a measurement signal outputted by the sensor unit 40 connected to the second connector 31 provided at the position of the position number “2”. is there. Thereafter, the plurality of measurement signals sequentially given to the management unit 50 are given to the management unit 50 according to the order of the position numbers of the second connectors 31 to which the sensor units 40 are connected.

Therefore, the management part 50 can acquire the position number of the sensor part 40 which output the measurement signal according to the order when the measurement signal is given.
Further, as described above, the ID information of each battery module 4 is added to the measurement signal. Therefore, when the management unit 50 receives the measurement signal, the management unit 50 acquires the position number of the sensor unit 40 that outputs the measurement signal from the order in which the measurement signal is given, and the battery module in which the sensor unit 40 is provided. Four sequence positions can be identified.
Moreover, the management part 50 can specify the battery module 4 of the sensor part 40 which transmitted the said measurement signal from ID information added to the said measurement signal.

As described above, when the measurement signal is given to the management unit 50, the ID information of the battery module 4 and the position information of the battery module 4 corresponding to the ID information are given to the management unit 50 in association with each other.
Thereby, the management part 50 can specify easily the position where the battery module 4 specified by ID information is arranged.

  That is, the signal path 33 and each flip-flop 35 constituting the shift register, and each second connector 31 connected to the signal path 33 receives the ID information output from the sensor unit 40, and the ID information, A reception unit is provided that associates the position information of the battery module 4 corresponding to the ID information and provides the information to the management unit 50.

  Assuming that the ID information added to the measurement signal given to the management unit 50 is, in order from the measurement signal given first, ID = “1”, ID = “2”, ID = “3”,. If ID = “16” is set, the management unit 50 associates the ID information of each battery module 4 with the position number and registers them in the database DB as shown in FIG.

  The database DB is configured so that various information can be registered over time in association with the ID information of each battery module 4.

  As described above, each unit configuring the reception unit associates the ID information of each battery module 4 with the position number, which is the position information of the battery module 4 corresponding to the ID information, and provides it to the management unit 50. The position where 4 is arranged can be easily specified.

  Returning to FIG. 7, the management unit 50 further obtains measurement information representing the measurement values (SOC, current value, voltage value, and temperature) of each battery module 4 from the measurement signal from each sensor unit 40, and performs measurement. The information is registered in the database DB in association with the ID information of each battery module 4.

The processing unit 3 performs processing (degradation degree evaluation processing) for evaluating the degree of deterioration of each battery module 4 and the assembled battery 2 based on various types of information registered in the database DB.
FIG. 9 is a flowchart illustrating a procedure of the deterioration degree evaluation process performed by the processing unit 3.
9 and 7, when the management unit 50 acquires the measurement information (step S1) and registers the position number and the measurement information in the database DB in association with the ID information of each battery module 4, the processing unit 3 Causes the capacity calculator 51 to calculate the current capacity of each battery module 4 (step S2).

The capacity calculation unit 51 has a function of obtaining the current capacity of each battery module 4 based on the measurement information.
The capacity calculation unit 51 obtains the current capacity of each battery module 4 based on the following formula (1).

In Expression (1), C represents a capacity, and i represents a current. Also, time t ₁ indicates a certain time, time t ₂ indicates a time that has passed a predetermined period from time t ₁ , SOC ₁ indicates the SOC at time t ₁ , and SOC ₂ indicates time t ₂ The SOC is shown.
In the above equation (1), the capacity is obtained by dividing the integrated value of current in a certain period by the change in SOC.
Capacity calculation unit 51 when the measurement value included in the latest measurement information measured and the time t _2, as the time t ₁ is the time when a predetermined time period in the past than the time t _2, the time from t ₁ time t ₂ The current capacity C of each battery module 4 is obtained using the measured value (SOC, current value) until.

In the database DB, past measurement information of each battery module 4 is registered over time in association with ID information. Therefore, each functional unit can acquire necessary information from the database DB.
The capacity calculation unit 51 obtains the current capacity C of each battery module 4 by using the latest measurement information registered in the database DB and past measurement information.

  When the current capacity C of each battery module 4 is obtained, the capacity calculation unit 51 registers the obtained current capacity C of each battery module 4 in the database DB in association with the ID information of each battery module 4.

  When the capacity calculation unit 51 registers the current capacity C in the database DB in association with the ID information of each battery module 4, the processing unit 3 makes a determination regarding the current capacity C of each battery module 4 in the replacement module specifying unit 52. Is executed (step S3).

The replacement module specifying unit 52 determines whether or not a battery module 4 having a current capacity C smaller than a preset capacity threshold _CTh is included in each battery module 4 (step S3).

When the battery module 4 in which the current capacity C is smaller than the preset capacity threshold _CTh is included, the replacement module specifying unit 52 proceeds to step S4, where the current capacity C is smaller than the threshold _CTh. The battery module 4 is specified, and information indicating that the specified battery module 4 is the battery module 4 to be replaced is registered in the database DB (step S4). As described above, the replacement module specifying unit 52 has a function of specifying the battery module 4 to be replaced based on the current capacity C indicating the degree of deterioration of the battery module 4.

Note that the threshold value C _Th is set to a capacity that allows the battery module 4 of the present embodiment to be determined to be practically unusable and reaching the end of its life. Therefore, the replacement module specifying unit 52 specifies the battery module to be replaced with a new one because the current life has been reached.

  When the information indicating that the replacement module specifying unit 52 is the battery module 4 to be replaced is registered in the database DB, the processing unit 3 causes the output unit 53 to store the information registered in the database DB of the assembled battery system 1. The output is made to the user (step S5), and the process ends.

The output unit 53 has a function of outputting information registered in the database DB to the user.
In addition to the current capacity C and position number of the battery module 4 registered in the database DB, the output unit 53 displays information indicating that the battery module 4 is a battery module 4 to be replaced for each ID information of the battery module 4. Output to.
Further, the remaining life of the assembled battery 2 as a whole depends on the smallest remaining life among the remaining lives of the battery modules 4. Therefore, the processing unit 3 outputs information indicating the degree of deterioration of the assembled battery 2 that the entire assembled battery 2 has reached the end of its life due to the presence of the battery module 4 to be replaced.
Thereby, the output unit 53 can provide the user with information such as ID information and position number of the battery module 4 to be replaced with a new one, and information indicating the degree of deterioration of the assembled battery 2.

The output unit 53 displays the ID information and position number of the battery module 4 to be replaced with a new one as “battery module that must be replaced with a new one” to the user, It is possible to prompt the user to replace the battery module 4 to be replaced with a new one.
That is, the replacement module specifying unit 52 of the processing unit 3 specifies how to replace each of the one or a plurality of battery modules 4 that can reduce the degree of deterioration of the assembled battery 2 (replacement with a new one), and outputs the processing unit 3. The unit 53 outputs information indicating how to replace each of the one or more battery modules 4.

  Note that the output unit 53 can provide the above-described information to the user by display on a display or printing, sound generated from a speaker, or the like.

In step S3, when it is determined that the battery module 4 whose current capacity C is smaller than the preset capacity threshold value _CTh is not included, the processing unit 3 causes the remaining life estimation unit 54 to store each battery module 4 An estimated value of the remaining life is obtained (step S6).

The remaining life estimation unit 54 has a function of obtaining an estimated value of the remaining life of each battery module 4 based on the measurement information of each battery module 4.
The remaining life estimation unit 54 stores a deterioration prediction formula indicating the deterioration of the capacity obtained by the least square method based on the relationship between the capacity of the battery module 4 experimentally obtained in advance and the usage time. Based on the prediction formula, the remaining life of the battery module 4 is obtained.

FIG. 10 is a graph for explaining how to calculate the remaining life estimation value performed by the remaining life estimation unit 54.
In FIG. 10, the deterioration prediction formula expressed as a deterioration prediction curve was obtained as follows.
That is, the relationship between the capacity C of the battery module 4 and the usage time t is experimentally measured in advance using the actual battery module 4, and an approximate expression is obtained by the least square method using the measured value. An approximate expression in which the capacity C of the battery module 4 is expressed by the usage time t is defined as a deterioration prediction expression. The deterioration prediction formula can be expressed as the following formula (2).
C = f (t) (2)

In Equation (2), C is the capacity of the battery module 4 and t is the usage time.
Here, since the capacity deterioration of the battery depends on the use temperature, it is necessary to consider the use temperature. Therefore, an experiment using the actual battery module 4 for obtaining the equation (2) was performed for each of a plurality of predetermined use temperatures, and a deterioration prediction formula at each temperature was obtained.

Furthermore, since the internal reaction of the battery is a chemical reaction, it is assumed that the capacity deterioration of the battery follows Arrhenius' law, and the relationship between the capacity C of the battery module 4 and the operating temperature is approximated by the Arrhenius expression, and the following formula ( As shown in 3), a deterioration prediction formula considering the operating temperature was obtained.
C = f (t, Temp) (3)

  In Equation (3), Temp is a use temperature. Expression (3) represents the capacity C of the battery module 4 by a function f of the use time t and the use temperature Temp.

The remaining life estimation unit 54 stores the above formula (3), and substitutes the current capacity C included in the measurement information and the internal temperature of the battery module 4 into the formula (3).
Thereby, the remaining life estimation part 54 can obtain | require the present use time ta in _a prediction curve in FIG.
In addition, the remaining life estimation unit 54 substitutes the above-described capacity threshold value C _Th and the internal temperature of the battery module 4 into Equation (3).
Thereby, the remaining life estimation part 54 can obtain _| require the lifetime tf when it is estimated that it will reach a lifetime by becoming the threshold value _CTh in a prediction curve in FIG.
Remaining life estimation unit 54 obtains the the lifetime t _f, the difference between the current use time t _a as residual life estimate t _r.

Remaining life estimation unit 54 obtains the remaining life estimate t _r based on the respective measurement information of each battery module 4 that are registered in the database DB.
Then, remaining life estimation unit 54, among the remaining life estimate t _r of the battery modules 4 determined, the maximum residual life difference is the difference between the maximum remaining service life estimate t _rmax, and the minimum remaining life estimate t _rmin seek Δt _r.
Returning to FIG. 9, the remaining service life estimation portion 54 determines whether the maximum residual life difference Δt or _r is preset smaller than a predetermined threshold value t _Th (step S7).

Maximum remaining life difference? Tr (the threshold value t _Th or more) is not smaller than the threshold value t _Th case, remaining life estimation unit 54 determines that the divergence of the remaining life estimate tr is larger between each battery module 4, the process The unit 3 causes the arrangement specifying unit 55 to obtain a new arrangement position of each battery module 4 (step S8).
The remaining lifetime of the assembled battery 2 as a whole depends on the smallest remaining lifetime among the remaining lifetimes of the battery modules 4. For this reason, the processing unit 3 causes the sequence specifying unit 55 to obtain a new sequence position that can increase the minimum remaining life estimation value _trmin as much as possible.

In principle, the arrangement specifying unit 55 determines the order of the battery modules 4 between the position of the battery module 4 having the maximum remaining life estimation value _trmax and the position of the battery module 4 having the minimum remaining life estimation value _trmin. By rearranging, the minimum remaining life estimation value _trmin is made as large as possible, and a new arrangement position that can reduce the deterioration degree of the assembled battery 2 as a whole is obtained.

FIG. 11 is a diagram illustrating an example of a new arrangement position obtained by the arrangement specifying unit 55.
FIG. 11 shows a case where the array specifying unit 55 obtains a new array position with respect to the array position shown in FIG.

Batteries quickly deteriorate in capacity as the operating temperature rises, causing a reduction in life.
Here, if the periphery of the battery module 4 is surrounded by the battery module 4, the internal temperature thereof is relatively higher than that of the battery module 4 not surrounded.
In the case of the arrangement of FIG. 8, the internal temperature of the battery modules 4 arranged at the position numbers “1”, “4”, “13”, and “16”, which are the four corners of the base plate 6, becomes relatively low. The internal temperature of the battery modules 4 arranged in the position numbers “6”, “7”, “13”, and “16”, which are parts, becomes relatively high.
For this reason, the battery modules 4 arranged at the position numbers “6”, “7”, “13”, and “16”, which are the center of the base plate 6, tend to have shorter battery life than the other battery modules 4.

Therefore, in FIG. 10, the battery modules 4 arranged at the position numbers “6”, “7”, “13”, and “16”, which are the center of the base plate 6, have the minimum remaining life estimated value _trmin . When the battery modules 4 arranged at the position numbers “1”, “4”, “13”, and “16” that are the four corners have the maximum remaining life estimated value _trmax , a new arrangement that the arrangement specifying unit 55 obtains is shown. .

In FIG. 11, the battery module 4 with ID = “1” arranged at the position number “1” in FIG. 8 and the battery module 4 with ID = “6” arranged at the position number “6” in FIG. And have exchanged. Similarly, the battery module 4 with ID = “4” arranged at the position number “4” in FIG. 8 and the battery module 4 with ID = “7” arranged at the position number “7” in FIG. And the battery module 4 with ID = “10” arranged at the position number “10” in FIG. 8 and the battery module 4 with ID = “13” arranged at the position number “13” in FIG. And the battery module 4 with ID = “11” arranged at the position number “11” in FIG. 8 and the battery module with ID = “16” arranged at the position number “16” in FIG. 8. 4 is exchanged.
In addition, about the other battery module 4, there is no change in an arrangement | sequence and description is abbreviate | omitted.

  Thus, in FIG. 11, the battery modules 4 arranged at the position numbers “6”, “7”, “13”, and “16”, which are the center of the base plate 6 in FIG. 8, and the base plate 6 in FIG. The arrangement positions where the battery modules 4 arranged at the position numbers “1”, “4”, “13”, and “16” at the four corners are replaced are shown.

When the new array position is obtained, the array specifying unit 55 gives information indicating the new array position to the remaining lifetime estimating unit 54.
Referring to FIG. 9, when information indicating the new arrangement position is given to remaining life estimation unit 54, processing unit 3 returns to step S <b> 6 again and the remaining life estimation unit 54 estimates the remaining life of each battery module 4. A value _tr is obtained (step S6).
Remaining life estimation unit 54, in case where it is a new sequence position, determine the remaining life estimate t _r of the battery module 4.

Here, when the remaining life estimation value tr is obtained based on the new arrangement position, the current capacity of the battery module 4 is used for the capacity, but the arrangement position is used for the internal temperature (use temperature Temp). The internal temperature included in the measurement information of the battery modules 4 arranged before the change is used.
As described above, the internal temperature of the battery module 4 depends on the arrangement position of the battery modules 4. For this reason, even if the battery module 4 is replaced, the value measured at the arrangement position is used for the internal temperature.

For example, in FIG. 11, for the battery module 4 with ID = “1” whose arrangement position is changed to the position number “6”, in order to obtain the remaining life estimation value tr, the battery module 4 with ID = “1” The current capacity and the internal temperature of the battery module 4 with ID = “6” included in the measurement information of the battery module 4 with ID = “6” are used.
Thus, the remaining service life estimation portion 54 can determine the remaining life estimate t _r when the ID = battery module 4 "6" was placed in position number "6".

Remaining life estimation unit 54 obtains by also similar to the above procedures for remaining life estimate t _r of the other battery modules 4, the maximum and residual life estimate t _rmax, the minimum remaining life estimation when a new sequence position determine the maximum residual life difference Delta] t _r and the value _{t rmin.}
Then, remaining life estimation unit 54, the maximum residual life difference Delta] t _r is determined whether the difference is less than a predetermined threshold value _{t Th} (step S7).

If the maximum residual life difference Delta] t _r is determined to the threshold value t _Th is smaller than the remaining life estimation unit 54, processing unit 3 proceeds to step S9. In other words, the processing unit 3, up to a maximum residual life difference Delta] t _r is determined to the threshold value t _Th is smaller than, repeats the step S8 from step S6.
As a result, the processing unit 3 can obtain a new arrangement position that can increase the minimum remaining life estimation value _trmin as much as possible and reduce the degree of deterioration of the assembled battery 2 as a whole.

Incidentally, in step S7, the minimum remaining life estimate t _rmin when a new sequence position, that is larger than the minimum remaining life estimate t _rmin at sequence position the current condition to proceed to step S9 Furthermore, you may add.

In step S <b> 9, the processing unit 3 causes the output unit 53 to output the minimum remaining life estimated value tr _min at the current arrangement position as the remaining life of the current assembled battery 2. Further, when the processing unit 3 obtains a new arrangement position, the processor module 3 arranges each battery module 4 at the new arrangement position using the last obtained estimated remaining life tr _min when the new arrangement position is obtained. The output unit 53 outputs the estimated remaining life of the assembled battery 2 when it is corrected.
Furthermore, the processing unit 3 outputs information indicating the new arrangement position obtained last.
In addition, the processing unit 3 may output the current capacity C and position number of each battery module 4 registered in the database DB for each ID information of the battery module 4.

When the processing unit 3 outputs information indicating the remaining life of the assembled battery 2 as described above, the estimated remaining life of the assembled battery 2 when rearranged to a new arrangement position, and information indicating the new arrangement position, the processing unit 3 performs processing. Finish.
Thus, the processing unit 3 obtains a new sequence position based on a minimum remaining life estimate t _r as a plurality of battery modules 4 each degree of deterioration, the battery module to be replaced by a plurality of battery modules 4 with each other The information indicating the specified battery module 4 is output.

  That is, the processing unit 3 replaces each of the plurality of battery modules 4 that can reduce the degree of deterioration of the assembled battery 2 (exchange of the battery modules 4 for rearranging the plurality of arranged battery modules 4). Specific information is output, which indicates how to replace each of the plurality of battery modules 4.

  In the present embodiment, the processing unit 3 outputs the remaining life of the assembled battery 2 at the current arrangement position and the estimated remaining life of the assembled battery 2 when rearranged at the new arrangement position. By adopting the position, it is possible to present to the user how much the degree of deterioration is reduced.

[Effect]
The assembled battery system 1 of this embodiment includes an assembled battery 2 configured by connecting a plurality of battery modules 4 arranged on a base plate 6 to each other, and a sensor that measures charge / discharge power of each of the plurality of battery modules 4. Unit 40 and a processing unit 3 for obtaining a capacity C as a degree of deterioration of each of the plurality of battery modules 4 based on measurement information (SOC, current value, voltage value) representing measurement results of the sensor unit 40, and a plurality of The battery modules 4 are detachably arranged at predetermined positions on the base plate 6, and the processing unit 3 obtains the degree of deterioration of the assembled battery 2 based on the degree of deterioration of each of the plurality of battery modules 4. Information indicating the degree of deterioration of the battery 2 is output.

According to the assembled battery system 1 configured as described above, since the plurality of battery modules 4 are detachably arranged, the user using the assembled battery system 1 replaces the battery modules 4 and rearranges them. can do.
Therefore, by outputting the current capacity C and the remaining life estimated value, which is information indicating the degree of deterioration of each battery module 4, it is possible to replace the battery module 4 or replace a plurality of battery modules 4 with each other. Rearrangement or the like can be urged to the user. Thus, according to the present invention, the usable battery module 4 can be used without waste, and information for maintaining stable battery performance over a long period of time can be provided.

In the above embodiment, the processing unit 3 calculates a plurality of battery modules 4 each remaining life estimation value t _r as the deterioration degree of the deterioration degree of the remaining life of the battery pack 2 further based on the remaining lifetime estimate t _r Therefore, the future deterioration tendency of the plurality of battery modules 4 and the assembled battery 2 can be grasped.

The sensor unit 40 can measure the internal temperature of each of the plurality of battery modules 4, and the processing unit 3 can measure the charging / discharging power (SOC, current value, voltage value) of each of the plurality of battery modules 4 and based on the internal temperature obtaining a plurality of battery modules 4 each remaining life estimate t _r.
Here, the estimated remaining life of each battery module 4 and the assembled battery 2, that is, the future capacity C indicating the degree of future degradation tends to depend on the temperature. Therefore, in this case, the processing unit 3 can obtain the estimated remaining life value of each battery module 4 and the assembled battery 2 with higher accuracy by considering the internal temperature in addition to the measurement result of the charge / discharge power.

Further, the processing unit 3 specifies a battery module to be replaced with a new one because it has reached the end of its life based on the current capacity C as the degree of deterioration of each of the plurality of battery modules 4 (step S3), search of a new sequence position based on a plurality of battery modules 4 minimum remaining life estimate t _r as each degree of deterioration, identifies the battery module to be replaced by a plurality of battery modules 4 with each other (step S6-S8). Further, the processing unit 3 outputs information indicating the specified battery module 4 (steps S5 and S9). Thereby, replacement | exchange of the battery module which can reduce the deterioration degree of an assembled battery can be performed easily.

[Others]
The present invention is not limited to the above embodiments. For example, in each of the above-described embodiments, the case where a lithium ion battery is used as a single battery has been described. However, a battery module may be configured using another type of single battery.
Moreover, in the said embodiment, although the case where it comprised so that the control part 44 of the sensor part 40 calculated | required SOC of the battery module 4 was illustrated, the sensor part 40 is the electric current value which each sensor 41,42,43 measured, Information regarding the voltage value and the temperature may be given to the processing unit 3, and the processing unit 3 may obtain the SOC.

DESCRIPTION OF SYMBOLS 1 assembled battery system 2 assembled battery 3 process part 4 battery module 5 housing 6 base board 6a upper surface 7 cover 8 communication cable 10 unit cell 10a electrode terminal 10b electrode terminal 10c electrode terminal 11 case 12 conducting member 13 1st electrode tab 13a hole 14 second electrode tab 14a hole 20 connecting member 20a one end 20b other end 21 bolt 22 nut 25 holding recess 26 edge 30 first connector 31 second connector 33 signal path 35 flip-flop 40 sensor unit 41 current sensor 42 voltage Sensor 43 Temperature sensor 44 Control unit 45 Storage unit 50 Management unit 51 Capacity calculation unit 52 Replacement module identification unit 53 Output unit 54 Remaining life estimation unit 55 Array identification unit DB database

Claims (11)

An assembled battery configured by connecting a plurality of battery modules arranged on a base plate to each other;
A measurement unit for measuring charge / discharge power of each of the plurality of battery modules;
A processing unit for determining the degree of deterioration of each of the plurality of battery modules based on the measurement result of the measuring unit,
The plurality of battery modules are detachably arranged at predetermined positions on the base plate,
The said process part calculates | requires the deterioration degree of the said assembled battery based on the deterioration degree of each of these battery modules, and outputs the information which shows the deterioration degree of the said assembled battery.   The assembled battery system according to claim 1, wherein the processing unit obtains the remaining life of each of the plurality of battery modules as a deterioration degree, thereby obtaining the remaining life of the assembled battery as a deterioration degree. The measurement unit can measure the temperature of each of the plurality of battery modules,
The assembled battery system according to claim 1, wherein the processing unit obtains a degree of deterioration of each of the plurality of battery modules based on a measurement result and temperature of charge / discharge power of each of the plurality of battery modules. The processor is
Based on the degree of deterioration of each of the plurality of battery modules, identify the battery module to be replaced,
The assembled battery system according to claim 2 or 3, wherein information indicating the specified battery module is output. The processor is
Based on the degree of deterioration of each of the plurality of battery modules, specify how to replace one or more battery modules that can reduce the degree of deterioration of the assembled battery,
The assembled battery system according to any one of claims 1 to 4, wherein information indicating how to replace the one or more battery modules is output. Each of the plurality of battery modules is composed of a plurality of unit cells connected to each other by a conductive member fixed by welding, and a positive electrode of the battery module provided in a casing that houses the plurality of unit cells, and It has an electrode to be a negative electrode,
The assembled battery system according to any one of claims 1 to 5, wherein the electrode is connected to an electrode of another battery module by pressure bonding. The processor is
A management unit for acquiring position information for specifying a position in the base plate in which the plurality of battery modules are arranged;
The assembled battery system according to any one of claims 1 to 4, wherein information indicating the specified battery module or information indicating a replacement method of each of the plurality of battery modules is represented by the position information. Each of the plurality of battery modules includes an identification information output unit that outputs identification information for identifying the plurality of battery modules.
The information processing apparatus further includes a receiving unit that receives the identification information output from the identification information output unit, and associates the identification information with the position information of the battery module corresponding to the identification information and provides the position information to the management unit. 8. The assembled battery system according to 7. An assembled battery system including an assembled battery configured by connecting a plurality of battery modules to each other,
Each of the plurality of battery modules is composed of a plurality of unit cells connected to each other by welding and fixing the conductive member to the electrode terminal, and the battery module is provided in a casing that houses the plurality of unit cells. An assembled battery system comprising electrodes serving as a positive electrode and a negative electrode of a module, and being connected to each other by crimping the electrodes. An assembled battery system including an assembled battery configured by connecting a plurality of battery modules arranged on a base plate to each other,
An assembled battery system including a management unit that acquires position information for specifying a position on the base plate in which the plurality of battery modules are arranged. Each of the plurality of battery modules includes an identification information output unit that outputs identification information for identifying the plurality of battery modules.
The information processing apparatus further includes a receiving unit that receives the identification information output from the identification information output unit, and associates the identification information with the position information of the battery module corresponding to the identification information and provides the position information to the management unit. 10. The assembled battery system according to 10.