JP7316973B2 - battery pack - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Law 1. Website publication date: January 10, 2020 Website address: Keihin Corporation Press release https://www. Keihin-corp. co. jp/news/20200110-1/2. Website publication date: January 16, 2020 Website address: Nikkan Jidosha Shimbun electronic version https://www. netden jd. com/articles/-/2264283. Publication date: January 16, 2020 Publication: Nikkan Jidosha Shimbun, published on January 16, 2020, page 3 4. Website publication date: January 15, 2020 Website address: Response https://response. jp/article/2020/01/15/330696. html5. Website publication date: January 24, 2020 Website address: MONOist https://monoist. atmarkit. co. jp/mn/articles/2001/24/news058. html6. Website publication date: February 03, 2020 Website address: Nikkei Cross Tech https://xtech. nikkei. com/atcl/nxt/column/18/00063/00067/7. Website publication date: January 10, 2020 Website address: MARKLINES https://www. marklines. com/en/news/2348588. Date: January 15-17, 2020 Exhibition name, Venue: 12th Automotive World Tokyo Big Sight

The present invention relates to battery modules, battery packs and battery module systems.

2. Description of the Related Art An electric vehicle or the like is equipped with a battery pack as disclosed in Patent Document 1, for example. A battery pack includes a battery module in which a plurality of battery cells are connected in series to form a module, and a battery management unit for controlling and managing these battery modules. Generally, a single battery pack is equipped with a plurality of battery modules, and these battery modules are controlled and managed by a single battery management unit.

JP 2014-102248 A

In recent years, the number of vehicles equipped with battery packs, such as electric vehicles, has increased, and various methods for recycling and reusing battery modules included in battery packs have been proposed. In the case of reusing the battery module, for example, the battery module is mounted on another device or the like and used. On the other hand, when the battery module is recycled, the battery module is disassembled into battery cells and the like, and the battery cells are further disassembled and used as raw materials for other products. Battery modules whose battery cells are less deteriorated are generally reused, and battery modules including battery cells whose deterioration is greater are generally recycled.

However, in the battery pack disclosed in Patent Document 1, all the information indicating the state of the battery cells of each battery module is stored in the battery management unit. Therefore, when the battery pack is disassembled and the battery module is removed from the battery management unit, information indicating the degree of deterioration of the battery cells cannot be extracted. Therefore, in order to obtain the degree of deterioration of the battery cells included in the battery module after disassembly, it is necessary to charge and discharge the battery module using a charging and discharging device. As is well known, a charging/discharging device capable of simultaneously charging/discharging many objects is large. For this reason, checking the states of all battery modules in discarded battery packs, which are expected to be generated in large numbers in the future, by a charging/discharging device hinders efficient reuse of battery modules.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object of the present invention is to make it possible to grasp the degree of deterioration of battery cells without charging and discharging battery modules generated after disassembly of a battery pack.

The present invention employs the following configurations as means for solving the above problems.

A first invention is a battery module comprising a plurality of battery cells and a voltage measuring section for measuring the voltage of each of the battery cells, wherein the voltage is calculated externally based on the measurement result of the voltage measuring section. A configuration is adopted in which a storage section for storing the degree of deterioration of the battery cell and a transmission section capable of transmitting the degree of deterioration stored in the storage section to the outside are employed.

In a second aspect based on the first aspect, the storage unit stores history information indicating a change over time of the battery cell in addition to the degree of deterioration, and the transmission unit stores history information indicating a change over time of the battery cell in addition to the degree of deterioration, A configuration is adopted in which the history information can be transmitted.

In a third aspect based on the second aspect, the history information includes temperature history information indicating temporal temperature changes of the battery cells, voltage history information indicating temporal voltage changes of the battery cells, and A configuration is adopted in which the information is at least one of current history information indicating current changes over time in the cell.

A fourth aspect of the invention employs a configuration in which, in the second or third aspect of the invention, there is provided a correction section that corrects the degree of deterioration based on the history information stored in the storage section.

A fifth invention is a battery pack comprising a battery module and a battery management unit for managing and controlling the battery module, wherein the battery module according to any one of the first to fourth inventions is used as the battery module. The battery management unit comprises a deterioration estimating unit that calculates the degree of deterioration of each battery cell based on the measurement result of the voltage measuring unit, and a battery management unit that stores the degree of deterioration calculated by the deterioration estimating unit. A storage section and a battery management unit transmission section for transmitting the degree of deterioration stored in the battery management unit storage section to the battery module are employed.

In a sixth aspect based on the fifth aspect, the deterioration stored in the battery management unit storage portion is caused by the battery management unit transmission portion inputting a signal indicating vehicle stop to the battery management unit. is transmitted to the battery module.

In a seventh aspect based on the fifth aspect, the battery management unit transmitting section and the deterioration estimating section calculate the degree of deterioration of each battery cell, and the degree of deterioration is stored in the battery management unit storage section. Accordingly, a configuration is adopted in which the degree of deterioration stored in the battery management unit storage section is transmitted to the battery module.

An eighth invention is a battery module system, comprising: the battery module according to any one of the first to seventh inventions; and a receiver capable of receiving a signal transmitted from the transmitter of the battery module. and a terminal, and the portable terminal has a display unit that performs display based on the signal received by the reception unit.

In the present invention, the battery module stores the degree of deterioration of the battery cells and can transmit this degree of deterioration to the outside. Therefore, in the present invention, even when the battery pack is disassembled and the battery module and the battery management unit are separated, the degree of deterioration of the battery cells can be retrieved from the battery module. Therefore, it is possible to know the degree of deterioration of the battery cells included in the battery module taken out from the battery pack without using a large charging/discharging device. Therefore, according to the present invention, it is possible to grasp the degree of deterioration of the battery cells without charging and discharging the battery module generated after disassembling the battery pack.

1 is a block diagram schematically showing a schematic configuration of a battery pack including battery modules of the present invention; FIG. 1 is a block diagram schematically showing a schematic configuration of a battery module system S including battery modules of the present invention; FIG. 4 is a flowchart for explaining the operation of the battery modules in the battery module system S of the present invention;

An embodiment of a battery module and a battery pack according to the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram schematically showing a schematic configuration of a battery pack P including battery modules 1 of this embodiment. As shown in FIG. 1, a battery pack P is mounted in a vehicle such as an electric vehicle, and includes a plurality of battery modules 1, connection lines 2, a battery management unit 3, a current sensor 4, and a contactor 5. there is

The battery module 1 includes an assembled battery 1a in which a plurality of battery cells c are connected in series, a temperature sensor 1b, and a battery monitoring device 1c. The battery module 1 is a module in which an assembled battery 1a, a temperature sensor 1b, a battery monitoring device 1c, and the like are integrally packaged in a housing (not shown). there is

As described above, the assembled battery 1a includes a plurality of battery cells c connected in series. The negative terminal of the battery cell c arranged at the end serves as the negative terminal of the assembled battery 1a. A positive terminal and a negative terminal of each battery cell c are connected to the battery monitoring device 1c via a transmission line. The temperature sensor 1b is arranged near the assembled battery 1a and outputs a signal indicating the temperature of the assembled battery 1a (that is, the temperature of the battery cell c).

The battery monitoring device 1c includes an equalization circuit 1d and a control processor 1e. The equalization circuit 1d is provided for each battery cell c and connects the positive terminal and the negative terminal of the battery cell c. Each equalization circuit 1d is connected in parallel to each battery cell c, and constitutes a series circuit of a discharge resistor and a switching element. These equalization circuits 1d are circuits for equalizing the voltages of the battery cells c included in the assembled battery 1a, and the switching elements are on/off controlled under the control of the control processing unit 1e. By turning on the switching element, the current of the battery cell c is converted into heat by the discharge resistance, and the voltage of the battery cell c drops.

The control processing unit 1e includes hardware such as a CPU (Central Processing Unit), a memory, an A/D conversion circuit, and an input/output interface, and has functional units embodied by these hardware. In this embodiment, the control processing unit 1e includes, as functional units, a voltage measurement unit 10, a temperature measurement unit 11, a correction unit 12, a storage unit 13, a transmission unit 14, a reception unit 15, and an equalization processing unit. 16.

The voltage measurement unit 10 receives a signal indicating the voltage (cell voltage) of the battery cell c input from the battery cell c via the transmission line, and sends the sample value to the battery information processing unit 3f of the battery management unit 3, which will be described later. Output as a processable measurement value (cell voltage data). The voltage measurement unit 10 acquires and outputs cell voltage data of each of the plurality of battery cells c included in the assembled battery 1a. The temperature measuring unit 11 receives a signal indicating the temperature of the battery cell c from the temperature sensor 1b, and converts the sample value into a measured value (temperature data).

The correction unit 12 periodically corrects the SOH (States Of Health) stored in the storage unit 13 . The later-described SOH stored as the degree of deterioration in the storage unit 13 changes according to temporal temperature changes, temporal cell voltage changes, and temporal current changes of the battery cells c. For this reason, the correction unit 12 uses temperature history information indicating temporal changes in temperature data, voltage history information indicating temporal changes in cell voltage data, and current history information indicating temporal changes in current data. Based on this, the SOH is corrected. In the battery pack P including the battery module 1 of the present embodiment, SOH is transmitted from the battery management unit 3 to the battery module 1 when a signal (IG-OFF) indicating that the ignition is turned off is input. be done. For this reason, the correcting unit 12, for example, based on real-time input signals from the voltage measuring unit 10 and the temperature measuring unit 11, determines the SOH based on the history information during a period in which the SOH is not transmitted from the battery management unit 3. You may make it correct|amend.

In the battery module 1 of the present embodiment, the storage unit 13 stores the SOH of each battery cell c as the degree of deterioration of the battery cell c. These SOH are calculated by the battery information processing section 3 f of the battery management unit 3 and input to the storage section 13 . Note that SOH changes over time. For this reason, the battery information processing section 3f of the battery management unit 3 calculates the SOH at regular time intervals, and after the calculated new SOH is stored in the storage section 3c or after a signal indicating that the vehicle has been stopped ( When a signal indicating that the ignition has been turned off is input to the battery management unit 3 , SOH is input to the storage section 13 . When the newly calculated SOH is input, the storage unit 13 stores the SOH by accumulating the SOH or updating the previous SOH.

Further, in the present embodiment, the storage unit 13 stores temperature history information indicating temporal changes in temperature data indicating temporal changes in battery cells c, voltage history information indicating temporal changes in cell voltage data, and current It also stores current history information that indicates changes in data over time.

Further, when the battery information processing section 3f of the battery management unit 3 detects an abnormality of the battery cell c and the abnormality detection data is input from the battery information processing section 3f of the battery management unit 3, the storage section 13 detects the abnormality. Store detection data. That is, in the present embodiment, when an abnormality is detected in the battery cell c, data indicating the abnormality is stored in the storage unit 13 .

Thus, in the present embodiment, the storage unit 13 stores SOH, temperature history information, voltage history information, voltage history information, current history information, and abnormality detection data as battery information. The battery information stored in the storage unit 13 can be transmitted to the outside via the transmission unit 14 .

The transmission unit 14 transmits battery information stored in the storage unit 13 to the outside of the battery module 1 . Further, the transmission unit 14 transmits voltage data and temperature data input from the voltage measurement unit 10 and the temperature measurement unit 11 to the outside. In this embodiment, the transmission unit 14 transmits battery information to the outside by wireless communication. The transmission from the transmission unit 14 is not limited to wireless communication, and the battery information may be transmitted by wire.

Such a transmitter 14 is wirelessly connected to the battery management unit 3 in the battery pack P, and outputs necessary battery information based on instructions from the battery management unit 3 . Further, as will be described later, the transmission unit 14 can be wirelessly connected to the mobile terminal 20 (see FIG. 2). That is, in this embodiment, the battery information stored in the storage unit 13 can be transmitted to the mobile terminal 20 via the transmission unit.

The receiver 15 is connected to the battery management unit 3 by wireless communication in this embodiment. It should be noted that reception by the receiving unit 15 is not limited to wireless communication, and may be received by wire. Such a receiving unit 15 receives current data input from the battery management unit 3 and sends the current data to the storage unit 13 .

Further, in the present embodiment, the receiver 15 receives the equalization instruction signal output from the battery management unit 3 and sends it to the equalization processor 16 . Further, as will be described later, the receiving unit 15 can be wirelessly connected to the mobile terminal 20 (see FIG. 2). In this embodiment, the receiving unit 15 also sends the equalization instruction signal to the equalization processing unit 16 when receiving the equalization instruction signal from the mobile terminal 20 .

The equalization processing unit 16 turns on the switching element of the equalization circuit 1d based on the equalization instruction signal input via the reception unit 15, and discharges the battery cell c connected in parallel to the equalization circuit 1d. Let By discharging the battery cells c individually in this way, the voltages of the plurality of battery cells c included in the assembled battery 1a are equalized.

The connection line 2 is a conductive line that connects the assembled battery 1 a and the outside of the battery module 1 . Two connection lines 2 are provided, one of which is connected to the positive terminal of the assembled battery 1a arranged on the most positive side, and the other connected to the negative terminal of the assembled battery 1a arranged on the most negative side. ing.

The battery management unit 3 is connected to all battery modules 1 and manages and controls the battery modules 1 . The battery management unit 3 includes hardware such as a CPU, a memory, an A/D conversion circuit, and an input/output interface, and has functional units embodied by these hardware.

In this embodiment, the battery management unit 3 includes a processing unit 3a, a current measurement unit 3b, a storage unit 3c (battery management unit storage unit), a transmission unit 3d (battery management unit transmission unit), a reception unit 3e, and a battery information processing unit 3f. The processing unit 3a performs various processes based on a signal input from a higher control system, a signal input via the battery module 1, a signal input from the current measurement unit 3b, and the like. In the present embodiment, the processing unit 3a receives an ignition-off signal from a higher-level control system or after a new SOH is calculated by the battery information processing unit 3f and the calculated new SOH is stored in the storage unit 3c. When input, the transmission unit 3d is caused to transmit the SOH, temperature history information, voltage history information, current history information, and abnormality detection data stored in the storage unit 3c to the battery module 1 as battery information.

Further, in the present embodiment, the processing unit 3a determines the necessity of equalization processing based on a signal input via the battery module 1, and determines whether the equalization processing unit connected to the battery cell c that requires the equalization processing. An instruction signal to the unit 16 is generated. Further, in the present embodiment, the processing unit 3a performs opening/closing control of the contactor 5 based on an ignition on/off signal input from the outside.

The storage unit 3c stores the SOH calculated by the battery information processing unit 3f. Temperature data, cell voltage data, and current data of the battery cell c are input to the storage unit 3c at predetermined sampling timings. The storage unit 3c accumulates the input temperature data, cell voltage data, and current data, and constantly updates and stores temperature history information, voltage history information, and current history information.

The current measuring unit 3b receives a signal indicating the current of the battery cell c from the current sensor 4, and outputs the sample value as a measured value (current data) that can be processed by the processing unit 3a. The transmission section 3d transmits the signal generated by the processing section 3a and the information stored in the storage section 3c to the outside of the battery management unit 3 . In this embodiment, the transmitter 3d is connected to the receiver 15 of the battery module 1 by wireless communication. The receiver 3e is connected to the transmitter 14 of the battery module 1 by wireless communication in this embodiment.

The battery information processing unit 3f calculates the degree of deterioration of each battery cell c based on the cell voltage data input from the voltage measurement unit 10 of the battery module 1. FIG. Here, the battery information processing unit 3f calculates SOH as the degree of deterioration of the battery cell c. The SOH is an index indicating the ratio of the full charge capacity at the time of deterioration to the initial full charge capacity. For this reason, for example, the battery information processing unit 3f calculates the current (at the time of deterioration) full charge capacity based on the cell voltage data, and compares it with the previously stored initial full charge capacity to obtain the battery cell c. Calculate the SOH for each Thus, the battery information processing unit 3f calculates the degree of deterioration of each battery cell c based on the measurement result of the voltage measurement unit 10. FIG.

Note that the method of calculating the degree of deterioration in the battery information processing unit 3f is not limited to that based on the full charge capacity. For example, the internal resistance value of the battery cell c can be estimated from the cell voltage and the current value of the battery cell c, and the SOH can be calculated from the degree of increase in the internal resistance value. For this reason, the battery information processing unit 3f calculates the internal resistance value of each battery cell c from the cell voltage data and the current data (to be described later) input from the current sensor 4 via the battery management unit 3, and The SOH may be calculated based on the rate of increase of the resistance value from the initial value.

The internal resistance value of the battery cell c can be estimated more accurately by using the temperature of the battery cell c. Therefore, the battery information processing unit 3f may add the temperature data input from the temperature sensor 1b of the battery module 1 to the cell voltage data and the current data to obtain the internal resistance value of the battery cell c. .

In addition, in the battery module 1 of the present embodiment, the battery information processing unit 3f detects an abnormality in the battery cell c. Output data. For example, if one of the battery cells c is overcharged and a protection circuit or the like (not shown) is activated, the battery module 1 including the battery cell c cannot be used without subsequent disassembly. Therefore, the battery module 1 in which the battery cell c has failed is recycled without being reused. Therefore, in the present embodiment, the battery information processing unit 3f outputs abnormality detection data indicating that an abnormality has occurred in the battery cell c. That is, the battery information processing section 3f functions as an abnormality detection section that detects an abnormality in the battery cell c. Such abnormality detection data is stored in the storage unit 13 .

The current sensor 4 is a sensor provided in the middle of the connection line 2 connected to the negative terminal of the assembled battery 1a arranged on the most negative side, and outputs a signal indicating the current flowing through the connection line 2. This current sensor 4 is connected to the battery management unit 3 . The contactor 5 is a switch that opens and closes the connection line 2 under the control of the battery management unit 3 , which is provided in the middle of each connection line 2 .

The battery pack P of this embodiment having such a configuration is mounted on a vehicle, and performs power supply from the assembled battery 1a or charging of the assembled battery 1a under the control of a higher-level control system. Thereafter, the battery pack P is removed from the vehicle and disassembled during maintenance or disposal of the vehicle. By disassembling the battery pack P in this manner, each battery module 1 is separated from the battery management unit 3 . The separated battery modules 1 are sorted as to whether they should be reused or recycled.

FIG. 2 is a block diagram schematically showing a schematic configuration of a battery module system S that is constructed when determining whether to reuse or recycle the battery module 1. As shown in FIG. As shown in this figure, the battery module system S includes a battery module 1 and a mobile terminal 20 connected to the battery module 1. FIG.

The mobile terminal 20 is a mobile tablet terminal or the like used by an operator who decides whether to reuse or recycle the battery module 1, and includes a display unit 21, an operation unit 22, a reception unit 23, and a transmission unit 24. I have. Such a mobile terminal 20 wirelessly transmits a command input from the operation unit 22 to the battery module 1 by the transmission unit 24, and displays information input from the battery module 1 via the reception unit 23 on the display unit 21. .

In this embodiment, the mobile terminal 20 receives the battery information stored in the battery module 1, displays it on the display unit 21, and transmits a command for equalization processing to the battery module 1 as necessary.

3 is a flowchart for explaining the operation of the battery module 1 in the battery module system S. FIG. As shown in this figure, the battery module 1 determines whether or not a battery information output command is input from the mobile terminal 20 (step S1). When the battery information output command is input from the mobile terminal 20, the battery module 1 transmits the battery information stored in the storage unit 13 to the mobile terminal 20 (step S2). By transmitting the battery information to the portable terminal 20 in this manner, the battery information is displayed on the display unit 21, and the operator can determine whether to reuse or recycle the battery module 1 based on the battery information. .

When step S2 is completed, the battery module 1 determines whether or not a command signal for equalization processing has been input from the mobile terminal 20 (step S3). If the battery information output command is not input from the portable terminal 20, the battery module 1 proceeds to step S3. When the command signal for the equalization process is input from the mobile terminal 20, the battery module 1 executes the equalization process (step S4). Here, the battery module 1 turns on the switching element of the equalization circuit 1d designated by the command signal to discharge the battery cells c connected in parallel to the equalization circuit 1d (step S4).

When step S4 is completed, or when the command signal for the equalization process is not input from the mobile terminal 20 in step S3, the battery module 1 ends the process. As described above, according to the battery module 1 of the present embodiment, the equalization process for equalizing the cell voltages can be performed by operating the mobile terminal 20 even after being removed from the battery pack P. can. Note that only one battery module 1 is connected to the mobile terminal 20 in FIG. However, it is also possible to simultaneously connect a plurality of battery modules 1 to the mobile terminal 20 and determine whether to reuse or recycle the plurality of battery modules 1 at once.

The battery module 1 of this embodiment as described above includes a plurality of battery cells c and a voltage measuring section 10 that measures the voltage of each battery cell c. In addition, the battery module 1 of the present embodiment includes a storage unit 13 that stores the degree of deterioration calculated by the battery information processing unit 3f of the battery management unit 3, and can transmit the degree of deterioration stored in the storage unit 13 to the outside. and a transmission unit 14 .

As described above, in the battery module 1 of the present embodiment, the battery module 1 can store the degree of deterioration of the battery cell c and transmit the degree of deterioration to the outside. Therefore, in the battery module 1 of the present embodiment, even when the battery pack P is disassembled and the battery module 1 and the battery management unit 3 are separated, the degree of deterioration of the battery cells c is retrieved from the battery module 1. Is possible. Therefore, the degree of deterioration of the battery cells c included in the battery module 1 taken out from the battery pack P can be known without using a large charging/discharging device. Therefore, according to the battery module 1 of the present embodiment, it is possible to grasp the degree of deterioration of the battery cells c without charging or discharging the battery module 1 generated after the battery pack P is disassembled.

In addition, in the battery module 1 of the present embodiment, the storage unit 13 stores history information indicating changes over time of the battery cells c in addition to the degree of deterioration, and the transmission unit 14 stores the history information in addition to the degree of deterioration. can be sent. Therefore, the operator can determine whether to reuse or recycle the battery module 1 by referring to the history information.

Further, in the battery module 1 of the present embodiment, the history information includes temperature history information indicating temporal temperature changes of the battery cells c, voltage history information indicating temporal voltage changes of the battery cells c, and voltage history information indicating temporal voltage changes of the battery cells c. Contains current history information that indicates changes in current over time. Therefore, the operator can determine whether to reuse or recycle the battery module 1 after confirming the history information that may affect the deterioration of the battery cell c.

Further, in the battery module 1 of the present embodiment, the correcting section 12 corrects the degree of deterioration based on the history information stored in the storage section 13 . By correcting the degree of deterioration in this way, it becomes possible to grasp the state of the battery cell c more accurately.

Further, the battery module 1 of the present embodiment includes the battery information processing section 3f of the battery management unit 3 that detects an abnormality in the battery cell c, and the storage section 13 stores information on the battery of the battery management unit 3 in addition to the degree of deterioration. Abnormality information indicating an abnormality detected by the information processing section 3f is stored, and the transmission section 14 can transmit the abnormality information in addition to the degree of deterioration. For example, by making it possible to acquire abnormality information from the battery modules 1, it is possible to quickly determine which battery module 1 has an abnormality.

Further, according to the battery pack P including the battery module 1 of the present embodiment, the battery management unit 3 that manages and controls the battery module 1 detects the deterioration of each battery cell c based on the measurement result of the voltage measurement unit 10. A battery information processing unit 3f (degradation estimating unit) that calculates the degree of deterioration is provided. Therefore, the calculation load on the battery module 1 can be reduced as compared with the case where the battery module 1 calculates the degree of deterioration.

Further, according to the battery pack P including the battery module 1 of the present embodiment, when a signal indicating vehicle stop is input to the battery management unit 3, the degree of deterioration stored in the storage section 3c is transmitted to the battery module 1. do. Therefore, the amount of communication between the battery module 1 and the battery management unit 3 can be reduced.

Further, according to the battery pack P including the battery module 1 of the present embodiment, at the timing when the battery information processing unit 3f calculates the degree of deterioration and stores the degree of deterioration in the storage unit 3c, the latest data stored in the storage unit 3c is stored. to the battery module 1. Therefore, the storage unit 3c of the battery module 1 can always store the latest deterioration degree.

Further, the battery module system S includes the battery module 1 and a mobile terminal 20 having a receiver 23 capable of receiving a signal transmitted from the transmitter 14 of the battery module 1. It has a display unit 21 that displays based on the received signal. Therefore, the operator can easily grasp the battery information of the battery module 1 using the portable terminal 20 .

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above embodiments. The various shapes, combinations, and the like of the constituent members shown in the above-described embodiment are examples, and can be variously changed based on design requirements and the like without departing from the gist of the present invention.

For example, in the above embodiment, the configuration in which SOH is stored in the storage unit 13 as the degree of deterioration has been described. However, the invention is not limited to this. It is also possible to employ a configuration in which another index indicating the degree of deterioration of the battery cell c is stored in the storage unit 13 as the degree of deterioration.

Further, in the above embodiment, the configuration in which history information is stored in the storage unit 13 has been described. However, the present invention is not limited to this, and it is also possible to employ a configuration in which the storage unit 13 stores the degree of deterioration and does not store the history information.

DESCRIPTION OF SYMBOLS 1...Battery module, 1a...Battery assembly, 1b...Temperature sensor, 1c...Battery monitoring device, 1d...Equalization circuit, 1e...Control processing part, 2...Connection line, 3...Battery management Unit 3a...Processing unit 3b...Current measuring unit 3c...Storage unit 3d...Transmitting unit 3e...Receiving unit 3f...Battery information processing unit (deterioration estimating unit) 4...Current Sensor 5 Contactor 10 Voltage measurement unit 11 Temperature measurement unit 12 Correction unit 13 Storage unit 14 Transmission unit 15 Reception unit 16 Equalization Processing unit 20 Portable terminal 21 Display unit 22 Operation unit 23 Reception unit 24 Transmission unit c Battery cell P Battery pack S Battery module system

Claims (5)

A battery pack comprising a battery module and a battery management unit that manages and controls the battery module,
The battery module is
A battery module comprising a plurality of battery cells and a voltage measuring unit that measures the voltage of each battery cell,
a storage unit that stores the degree of deterioration of the battery cell that is calculated externally based on the measurement result of the voltage measurement unit;
a transmission unit capable of transmitting the degree of deterioration stored in the storage unit to the outside;
with
The battery management unit
a deterioration estimation unit that calculates the degree of deterioration of each battery cell based on the measurement result of the voltage measurement unit;
a battery management unit storage unit that stores the degree of deterioration calculated by the deterioration estimation unit;
a battery management unit transmission unit configured to transmit the degree of deterioration stored in the battery management unit storage unit to the battery module ;
The battery management unit transmission section transmits the degree of deterioration stored in the battery management unit storage section to the battery module when a signal indicating vehicle stop is input to the battery management unit.
A battery pack characterized by: The storage unit stores, in addition to the degree of deterioration, history information indicating changes over time of the battery cells,
The battery pack according to claim 1, wherein the transmission unit can transmit the history information in addition to the degree of deterioration. The history information includes temperature history information indicating temporal temperature changes of the battery cells, voltage history information indicating temporal voltage changes of the battery cells, and current history information indicating temporal current changes of the battery cells. 3. The battery pack according to claim 2, wherein at least one of the above is used. 4. The battery pack according to claim 2, further comprising a correction section that corrects the degree of deterioration based on the history information stored in the storage section. The battery management unit transmission section is stored in the battery management unit storage section by the degradation estimation section calculating the degradation level of each battery cell and storing the degradation level in the battery management unit storage section. 5. The battery pack according to any one of claims 1 to 4, wherein the degree of deterioration is transmitted to the battery module.

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