WO2021049133A1

WO2021049133A1 - Battery control apparatus and on-vehicle battery system

Info

Publication number: WO2021049133A1
Application number: PCT/JP2020/025727
Authority: WO
Inventors: 孝徳山添; 井上　健士; 大輝小松; 修子山内; 茂樹牧野
Original assignee: 株式会社日立製作所
Priority date: 2019-09-11
Filing date: 2020-06-30
Publication date: 2021-03-18
Also published as: JP2021044157A

Abstract

The present invention provides a battery control apparatus with which it is possible to suppress temperature rise in a battery more effectively compared with conventional products in cases where the heat of the battery is absorbed using latent heat of a phase-change material. This battery control apparatus 200 for controlling a battery that is disposed so as to be able to conduct heat to a phase-change material is provided with a processing device 201 for calculating, on the basis of the phase-change temperature of the phase-change material and the temperature of the battery, the quantity of heat that is absorbed or released, as latent heat, by the phase-change material, and for determining charging conditions for the battery on the basis of the calculated quantity of heat.

Description

Battery control device and in-vehicle battery system

The present disclosure relates to a battery control device and an in-vehicle battery system.

Inventions related to battery control devices have been known conventionally (see Patent Document 1 below). The conventional battery control device described in Patent Document 1 includes a control unit that controls the charge / discharge current of the storage battery.

The control unit predicts the temperature rise of the storage battery based on the battery temperature and the amount of charge / discharge current, and uses the prediction result of the temperature rise from the values of the plurality of upper limit charge / discharge currents so as not to exceed the upper limit temperature of the storage battery. The charge / discharge current is controlled by selecting the value of one upper limit charge / discharge current (see the same document, claim 1 and paragraph 0007, etc.).

Further, inventions relating to a secondary battery module including a plurality of battery cells and a vehicle equipped with the secondary battery module are known (see Patent Document 2 below). The conventional secondary battery module described in Patent Document 2 includes a plurality of battery cells, a cooling liquid vaporization layer, a temperature sensor, a liquid detection sensor, and a control unit (the same document, claim). 1 and paragraph 0007, etc.).

The coolant vaporization layer is provided on the peripheral surface of the battery cell, and holds and vaporizes the vaporizing coolant supplied from the coolant supply source. The temperature sensor detects the temperature of the battery cell. The liquid detection sensor detects whether or not the vaporization coolant has been supplied to the coolant vaporization layer of the battery cell to be detected by the temperature sensor. The control unit controls the supply and stop of the vaporizing coolant from the coolant supply source to the coolant vaporization layer based on the detection values of the temperature sensor and the liquid detection sensor.

Further, an invention relating to an assembled battery including a plurality of cells arranged adjacent to each other is known (see Patent Document 3 below). The conventional assembled battery described in Patent Document 3 includes a phase-changing substance having a melting point higher than the temperature range during normal use of the cell and lower than the breakdown temperature at which the cell is thermally destroyed. This assembled battery is arranged in a form in which this phase change substance is absorbed and melted when one of the cells generates heat between adjacent cells adjacent to each other to a temperature higher than the melting point. (See the same document, claim 1, paragraph 0007, etc.).

JP-A-2018-170904 Japanese Unexamined Patent Publication No. 2012-054202 Japanese Unexamined Patent Publication No. 2010-073406

According to the battery control device described in Patent Document 1, appropriate temperature control of the storage battery becomes possible, and charge / discharge control can be performed without impairing the fuel efficiency performance and driving performance of the electric vehicle (the same document, the same document, See paragraph 0008, etc.). However, in this conventional battery control device, there is room for improvement in improving the heat dissipation of the storage battery.

According to the secondary battery module described in Patent Document 2 and the vehicle provided with the secondary battery module, the temperature of a plurality of battery cells provided in the secondary battery module due to the action of the coolant vaporization layer. (See the same document, paragraph 0008, etc.). However, this conventional secondary battery module has a problem that a configuration such as a coolant supply source, a vaporization coolant supply path, and a coolant vaporization layer is required.

According to the assembled battery described in Patent Document 3, when one of the cell cells constituting the assembled battery abnormally generates heat and exceeds the melting point of the phase changing substance, the phase changing substance arranged between the cell cells is arranged. Absorbs the heat and melts. Since the phase-changing substance can absorb the heat of the abnormally generated cell by the latent heat at the time of phase change (melting), the temperature rise of the cell adjacent to the abnormally generated cell is suppressed, and the temperature rise of the adjacent cell is suppressed. It is possible to prevent the battery from reaching the breaking temperature (see the same document, paragraph 0008, etc.).

In this conventional assembled battery, when the temperature of the cell near the melting point of the phase change substance is detected, it is presumed that the phase change substance is absorbing the heat of the cell as latent heat. However, in this conventional assembled battery, when the temperature of the cell near the melting point of the phase change substance is detected, the remaining amount of heat that can be absorbed by the phase change substance as latent heat is unknown. Therefore, the temperature of the cell is controlled. There is a problem that it becomes difficult.

The present disclosure provides a battery control device and an in-vehicle battery system capable of effectively suppressing a temperature rise of a battery as compared with the conventional case when absorbing the heat of the battery by utilizing the latent heat of the phase change material. ..

One aspect of the present disclosure is a battery control device that controls a battery that is thermally conductively arranged with respect to the phase change material, and the phase is based on the phase change temperature of the phase change material and the temperature of the battery. The battery control device is provided with a processing device that calculates the amount of heat absorbed or released as latent heat by the changing material and determines the charging conditions of the battery based on the amount of heat.

According to the present disclosure, when the latent heat of a phase change material is used to absorb the heat of a battery, a battery control device and an in-vehicle battery system capable of effectively suppressing a temperature rise of the battery as compared with the conventional case are provided. Can be provided.

The block diagram which shows the embodiment of the battery control device of this disclosure. The plan view explaining the structure of the battery pack of FIG. The perspective view explaining the structure of the battery cell of FIG. The functional block diagram of the battery control device of FIG. The graph which shows the time series of the temperature of the battery cell which comprises the battery pack of FIG. FIG. 5 is a flow chart illustrating the operation of the battery control device after charging is completed in FIG. FIG. 5 is a flow chart illustrating the operation of the battery control device after the start of charging in FIG. FIG. 5 is a flow chart illustrating the operation of the battery control device after the start of charging in FIG. FIG. 5 is a flow chart illustrating the operation of the battery control device after the start of charging in FIG. FIG. 5 is a flow chart illustrating the operation of the battery control device after the start of charging in FIG. The graph explaining the effect of suppressing the temperature rise of a battery cell by the battery control device of FIG. The schematic block diagram which shows the embodiment of the vehicle-mounted battery system of this disclosure.

Hereinafter, embodiments of the battery control device of the present disclosure will be described with reference to the drawings.

[Embodiment 1]
FIG. 1 is a block diagram showing an embodiment of the battery control device of the present disclosure. The battery control device 200 of the present embodiment is a device for controlling a battery pack 100 which is mounted on a vehicle such as a hybrid vehicle or an electric vehicle and supplies electric power to an electric device including a traveling motor. The battery control device 200 is connected to the battery pack 100 so that information can be communicated via, for example, a telecommunication line or signal wiring. Further, the battery control device 200 is connected to a higher-level control device 300 such as an electronic control device (ECU) of a vehicle so that information can be communicated via, for example, a telecommunication line or signal wiring.

For example, the battery control device 200 inputs the battery voltage value V, current value I, temperature T, charge rate (state of charge: SOC), etc. from the battery pack 100, and outputs a control signal CS to the battery pack 100. To do. The SOC may be calculated based on the voltage value V, the current value I, and the temperature T input from the battery pack 100 by, for example, the battery control device 200.

The control signal CS includes, for example, charge / discharge conditions such as a charge current value or a discharge current value, and cooling conditions such as a heat transfer coefficient. The control signal CS may be, for example, a control amount of the cooling fan based on the relationship between the air volume of the cooling fan and the heat transfer coefficient.

Further, the battery control device 200 outputs, for example, a battery state BS or the like to the upper control device 300, and a control signal or information Inf is input from the upper control device 300. The battery control device 200 includes, for example, a processing device 201 such as a CPU and an MPU that processes data, and a storage device 202 that stores data, computer programs, and the like.

FIG. 2 is a plan view illustrating an example of the configuration of the battery pack 100 of FIG. The battery pack 100 includes a plurality of battery cells 1 as batteries whose charge / discharge, temperature, and SOC are controlled by the battery control device 200. The battery cell 1 is, for example, a secondary battery such as a flat rectangular lithium ion secondary battery, and a plurality of battery cells 1 are arranged side by side in the thickness direction thereof. In the example shown in FIG. 2, the plurality of battery cells 1 form two rows of battery rows 1L arranged so as to be stacked in the thickness direction.

In each battery row 1L, the phase change material 2 is arranged between the

battery cells

1 and 1 adjacent to each other in the arrangement direction. The phase change material 2 has, for example, a structure in which a substance such as sodium acetate trihydrate having a melting point lower than the upper limit temperature of the battery cell 1 is sealed in an exterior material such as aluminum and formed into a sheet shape or a plate shape. doing. The melting point or phase change temperature of the phase change material 2, that is, the melting point or phase change temperature of the substance enclosed in the exterior material of the phase change material 2, ranges from, for example, about 40 [° C.] to about 60 [° C.]. For example, it is about 50 [° C.].

The plurality of phase change materials 2 are arranged so as to be heat conductive with each of the battery cells 1. Specifically, the sheet-shaped or plate-shaped phase changing material 2 is arranged so as to be in contact with the side surface having the maximum area of the flat rectangular parallelepiped battery cell 1. Further, in the battery row 1L in which the battery cells 1 are laminated with the phase change material 2 interposed therebetween, end plates 3 are arranged at both ends of the battery cells 1 in the stacking direction via spacers having electrical insulation. By connecting the pair of end plates 3, the plurality of battery cells 1 and the plurality of phase change materials 2 are fixed between the pair of end plates 3. As a result, the phase change material 2 is pressed against the side surface of the battery cell 1 and is in close contact with each other.

FIG. 3 is a perspective view illustrating the configuration of the battery cell 1 of FIG. The battery cell 1 includes, for example, a flat rectangular parallelepiped battery container 10. The battery container 10 is made of a metal such as an aluminum alloy, and is composed of a bottomed square tubular battery can 11 and a battery lid 12 that seals an opening at the upper end of the battery can 11. Although not shown, inside the battery container 10, a band-shaped positive electrode and a band-shaped negative electrode are laminated and wound via a band-shaped separator, and positive electrodes and negative electrodes at both ends of this electrode group. A pair of current collector plates, an electrically insulating member, an electrolytic solution, and the like, which are connected to each of the above, are housed.

The battery container 10 has a pair of wide side surfaces 10w on both sides in the thickness direction, a pair of narrow side surfaces 10n on both sides in the width direction, a bottom surface 10b, and an upper surface 10t. Of these surfaces of the battery container 10, the wide side surface 10w has the largest area. The above-mentioned phase change material 2 is arranged so as to be in contact with the wide side surface 10w of the battery container 10. On the upper surface 10t of the battery container 10, a pair of external terminals 14 are arranged at both ends in the width direction of the battery container 10 via a pair of insulating members 13, and a cleavage valve 15 and a note are provided between the pair of external terminals 14. A liquid port 16 is provided.

Of the pair of external terminals 14, one of the external terminals 14 is the external terminal 14P of the positive electrode connected to the positive electrode via the current collector plate, and the other external terminal 14 is the negative electrode of the negative electrode via the current collector plate. It is an external terminal 14N of the negative electrode connected to. The cleavage valve 15 opens when the pressure inside the battery container 10 rises abnormally to ensure the safety of the battery cell 1. The liquid injection port 16 is used for injecting an electrolytic solution into the battery container 10, and is sealed by a liquid injection plug 17.

As shown in FIG. 2, in each battery row 1L, the plurality of battery cells 1 have an external terminal 14P of the positive electrode of one adjacent battery cell 1 and an external terminal 14N of the negative electrode of the other battery cell 1, respectively. The batteries are arranged so as to be adjacent to each other in the arrangement direction of the battery row 1L so as to be alternately inverted. Further, for example, a plurality of external terminals 14P of the positive electrode of one adjacent battery cell 1 and an external terminal 14N of the negative electrode of the other battery cell 1 are sequentially connected by a bus bar (not shown). Battery cells 1 are connected in series.

Although not shown, each bus bar is connected to, for example, a voltage detection unit that measures the voltage of each battery cell 1. The voltage detection unit measures, for example, the voltage of each battery cell 1, the voltage of a plurality of battery cells 1 connected in series, or the voltage of a plurality of battery rows L connected in series or in parallel. As shown in FIG. 1, the voltage V of the battery detected by the voltage detection unit is output from the battery pack 100 to the battery control device 200. Further, the current I flowing through the battery cell 1 is measured by a current sensor (not shown), and is output from the battery pack 100 to the battery control device 200 as shown in FIG.

Further, as shown in FIG. 2, the battery pack 100 includes a plurality of temperature sensors 4 for measuring the surface temperatures of the plurality of battery cells 1. As shown in FIG. 1, the temperature T of the battery cell 1 measured by the temperature sensor 4 is output from the battery pack 100 to the battery control device 200. Further, as shown in FIG. 1, the SOC of each battery cell 1 calculated by the calculation unit (not shown) is output from the battery pack 100 to the battery control device 200.

Further, as shown in FIG. 1, the control signal CS output from the battery control device 200 is input to, for example, a battery management system (BMS) of the battery pack 100 (not shown), and the battery cell 1 is input via the BMS. Charging / discharging, temperature, SOC, etc. are controlled.

The operating temperature range of the battery pack 100 during normal use is, for example, a temperature range of about −30 [° C.] to about 60 [° C.]. In order to suppress deterioration of the battery cell 1 and use the battery cell 1 for as long as possible, it is required to maintain the temperature of the battery cell 1 at a temperature equal to or lower than the upper limit of the operating temperature range of the battery pack 100. To.

FIG. 4 is a functional block diagram of the battery control device 200 of FIG. The battery control device 200 has, for example, a data processing and storage function F1, a phase change material (substance) state determination function F2, and a control condition determination function F3.

The data processing and storage function F1 stores, for example, the data input from the battery pack 100 and the cooling conditions in the storage device 202 at a cycle of 1 [s]. The phase change material state determination function F2 determines the state of the phase change material 2 based on, for example, the cooling conditions and the time series data stored in the storage device 202. Here, determining the state of the phase change material 2 means, for example, determining the time for which the phase change material 2 stays at the phase change temperature Tpc. The control condition determination function F3 determines the charging condition and the cooling condition of the battery pack 100 based on, for example, the determination result of the state determination function F2 of the phase changing material and the SOC of the battery pack 100.

Each of the functions from the function F1 to the function F3 is composed of, for example, the processing device 201 and the storage device 202 of the battery control device 200, and the data and the computer program stored in the storage device 202. Hereinafter, the operation of the battery control device 200 of the present embodiment will be described with reference to FIGS. 5, 6 and 7A to 7D.

FIG. 5 is a graph showing a time series of the temperatures of the battery cells 1 constituting the battery pack 100 of FIG. When charging of the battery pack 100 is started at time x0, the temperature of the battery cell 1 rises. At time x1, the temperature of the battery cell 1 reaches the phase change temperature Tpc of the phase change material 2, that is, the melting point of the phase change material 2. Then, the phase change material 2 absorbs the heat of the battery cell 1 as latent heat, the temperature becomes constant, and the temperature rise of the battery cell 1 is suppressed. After that, at time x2, when the phase change of the phase change material 2 is completed and the phase change material 2 cannot absorb the heat of the battery cell 1 as latent heat, the endothermic effect of the phase change material 2 is reduced and the battery cell 1 The temperature rises. After that, charging of the battery pack 100 is completed at time x3.

FIG. 6 is a flow chart illustrating the operation of the battery control device 200 after the charging of the battery pack 100 is completed at the time x3 shown in FIG. When the charging of the battery pack 100 is completed at the time x3, the battery control device 200 first _{acquires the temperature T 0} of the battery cell 1 by the data processing and storage function F1, and the temperature T ₀ is the temperature T of the battery cell 1. The process P1 to be stored in the storage device 202 as the time series data of the above is executed. Then, the battery control unit 200, the data processing and storage functions F1, acquires the temperature T ₁ of the battery cell 1, and stores the temperature T ₁ in the storage device 202 as time-series data of the temperature T of the battery cells 1 Process P2 is executed. At this time, the cycle in which the battery control device 200 acquires the temperature T of the battery cell 1 is, for example, 1 [s].

Next, the battery controller 200, for example, the state determination function F2 of the phase change material, determine whether the temperature T ₁ of the battery cell 1 acquired in the process P1 is equal to the phase change temperature Tpc of the phase change material 2 Process P3 is executed. In process P3, if the temperature _{T 1} of the battery cell 1 is equal to the phase change temperature Tpc of the phase change material 2 (YES), the battery controller 200 is performed again from step P1 to the processing P3. On the other hand, in the process P3, when the phase change temperature Tpc of temperatures _{T 1} and the phase change material 2 of the battery cell 1 is different (NO), the battery control unit 200 executes the processing P4.

As shown in FIG. 5, for example, a vehicle equipped with the battery pack 100 runs between the time x3 and the time x4 when the charging of the battery pack 100 is completed, and the temperature of the battery cell 1 gradually decreases. However, since the temperature of the battery cell 1 is higher than the phase change temperature Tpc of the phase change material 2, the battery control device 200 executes the process P4 as a result of the determination of the process P3. _{In the process P4, in the battery control device 200, the time-series data Q 1} , Q ₂ , Q ₃ , ..., Q _n of the amount of heat [J / s] released from the phase change material 2 per unit time is stored in the storage device 202. When stored in, for example, the data processing and storage function F1 _{deletes the time-series data Q 1} , Q ₂ , Q ₃ , ..., Q _n of the calorific value.

Then, the battery control unit 200 executes the processing P5 for calculating the amount of heat Q ₁ emitted from the phase change material 2 was changed to temperatures T ₁ in the temperature T ₀ process P2 in the process P1. In the process P5, the battery controller 200, for example, the state determination function F2 of the phase change material, based on the following equation (1) to calculate the quantity of heat Q _1.

Q ₁ = (T _1- T ₀ ) x m x c ... (1)

In the above formula (1), m [kg] is the sum of the mass of the battery cell 1 and the mass of the phase change material 2, and c [J / kg · K] is the phase change of the phase change material 2. This is the specific heat of the battery cell 1 and the phase change material 2 at a temperature other than the temperature.

Next, the battery control device 200 executes the process P6 for setting the natural number n to 1, for example, by the data processing and storage function F1. After the end of the process P6, the battery control device 200 executes the process P7 for setting the natural number n to n + 1, for example, by the data processing and storage function F1. That is, when the process P7 is executed after the natural number n is set to 1 in the process P6, n is set to 2.

Then, the battery control unit 200, for example, by the data processing and storage functions F1, executes a process P8 of acquiring the temperature T _n of the battery cell 1. For example, if the natural number n in the process P7 is set to 2, the process P8, acquired temperature T ₂ of the battery cell 1, the storage device 202 that the temperature T ₂ is as time-series data of the temperature T of the battery cells 1 Be remembered.

Next, the battery controller 200, for example, the state determination function F2 of the phase change material, determine whether the temperature T _n of the battery cell 1 acquired in the process P8 is equal to the phase change temperature Tpc of the phase change material 2 Process P9 is executed. For example, when the temperature T ₂ of the battery cell 1 is acquired in the process P8, in the process P9, the state determination function F2 of the _{phase change material is such that the temperature T 2} of the battery cell 1 acquired in the process P8 is the phase change material 2. It is determined whether or not it is equal to the phase change temperature Tpc.

In process P9, if the temperature _{T n} of the battery cell 1 is equal to the phase change temperature Tpc of the phase change material 2 (YES), the battery control unit 200 executes the processing P13 and processing P14. On the other hand, in the process P9, if the phase change temperature Tpc temperature _{T n} and the phase change material 2 of the battery cell 1 is different (NO), the battery control unit 200 executes the processing P10 and processing P11.

As shown in FIG. 5, the temperature T of the battery cell 1 is higher than the phase change temperature Tpc of the phase change material 2 from the time x3 to the time x4 when the charging of the battery pack 100 is completed. Therefore, as a result of the determination of the process P9, the battery control device 200 executes the process P10. _{In the process P10, the battery control device 200 obtains time-series data Q 1} , Q ₂ , Q ₃ , ..., Q _n of the amount of heat emitted from the phase change material 2 per unit time by, for example, the data processing and storage function F1. , Delete from storage device 202.

_{Next, the battery control device 200 determines the amount of heat Q n} per unit time released from the phase change material 2 whose temperature has changed from T _n _-1 to T n by, for example, the phase change material state determination function F2. The process P11 for calculating using the equation (2) of is executed.

Q _n = (T _n −T _n-1 ) × m × c ・・・ (2)

For example, if n processing P7 is set to 2, the process P11, based on the equation (2), from temperatures T ₁ obtained by the processing P2, changes to temperature T ₂ which is obtained in the process P8 heat Q ₂ per unit time released from the phase change material 2 is calculated and stored in the storage device 202.

Next, the battery control device 200 executes a process P12 for determining whether or not charging of the battery pack 100 has been started by, for example, the data processing and storage function F1. As shown in FIG. 5, charging of the battery pack 100 is not started from the time x3 to the time x4 when the charging of the battery pack 100 is completed. In this case, the data processing and storage function F1 determines in the processing P12 that the charging of the battery pack 100 has not started (NO), and executes the processing P7 to the processing P9 again.

When the temperature of the battery cell 1 becomes equal to the phase change temperature Tpc of the phase change material 2 at the time x4, the state determination function F2 of the phase change material of the battery control device 200 changes the temperature Tn of the battery cell 1 to the phase in the process P9. It is determined that the temperature is equal to the change temperature Tpc (YES), and the process P13 is executed. _{In the process P13, the battery control device 200 determines the amount of heat Q n} released from the phase change material 2 whose temperature has changed from T _n _-1 to T n by, for example, the phase change material state determination function F2, and the temperature is T _{n. The} amount of heat released from the phase change material 2 changed from -2 to T _n -1 is set to _{Q n-1.}

_{Specifically, for example, in the treatment P13, the amount of heat Q n} released from the phase change material 2 due to _{the temperature change (T n −} T _n-1 ) between the previous treatment P8 and the current treatment P8 is calculated two times before. The amount of heat released from the phase change material 2 _{due to the temperature change (T n-1-} T _n-2 ) from the treatment P8 to the previous treatment P8 is set to _{Q n-1.} Next, the battery control device 200 stores the calorific value Q _n in the storage device 202 by, for example, the data processing and storage function F1.

That is, since the temperature T of the battery cell 1 is equal to the phase change temperature Tpc of the phase change material 2 from the time x4 to the time x5, it is estimated that the temperature of the phase change material 2 is also approximately equal to the phase change temperature Tpc. .. Therefore, between the time x4 and the time x5, the phase change material 2 changes from the liquid phase to the solid phase and releases heat, and the temperature of the phase change material 2 becomes constant at the phase change temperature Tpc. The temperature of No. 1 does not decrease, and is generally constant at the phase change temperature Tpc. At this time, the amount of heat Qn per unit time released by the phase change material 2 as latent heat can be calculated by the process P13 and the process P14.

That is, in the treatment P13 and the treatment P14 by the battery control device 200 of the present embodiment, when the temperature of the phase change material 2 is the phase change temperature Tpc, the amount of heat released or absorbed by the phase change material 2 as latent heat per unit time. Qn is assumed as follows. That is, it is assumed that the amount of heat released or absorbed by the phase change material 2 as latent heat per unit time is equal to the amount of heat released or absorbed by the phase change material 2 immediately before reaching the phase change temperature Tpc. If such an assumption does not apply, the battery control device 200 releases the phase change material 2 as latent heat per unit time based on the current I or voltage V of the battery input from the battery pack 100. The amount of heat Q to be absorbed may be calculated.

When the phase change of the phase change material 2 is completed at time x5, the temperature of the phase change material 2 drops to a temperature lower than the phase change temperature Tpc as the temperature T of the battery cell 1 decreases. As a result, the temperature T of the battery cell 1 and the temperature of the phase change material 2 are lowered from the time x5 to the time x6. Then, when the charging of the battery cell 1 is started at the time x6, it is determined in the process P12 that the charging is started (YES), and the process shown in FIG. 6 ends. Further, when charging of the battery cell 1 is started at time x6, the battery control device 200 starts the processes shown in FIGS. 7A to 7D.

7A to 7D are flow charts illustrating the operation of the battery control device 200 after the time x6 when the charging of the battery cell 1 in FIG. 5 is started. When charging of the battery cell 1 is started at the time x6 shown in FIG. 5, the battery control device 200 acquires the temperature Tc of the battery cell 1 as shown in FIG. 7A by, for example, the data processing and storage function F1. Process P21 is executed. Next, in the battery control device 200, for example, the temperature Tc of the battery cell 1 acquired in the process P21 and the phase change temperature of the phase change material 2 stored in the storage device 202 by the phase change material state determination function F2. The process P22 for determining whether or not Tpc is equal is executed.

During the time x6 to x7 shown in FIG. 5, the temperature T of the battery cell 1 is lower than the phase change temperature Tpc of the phase change material 2. Therefore, during this time x6 to x7, in the process P22, the battery control device 200 determines that the temperature Tc of the battery cell 1 and the phase change temperature Tpc of the phase change material 2 are not equal (NO). Process P23 is executed. In the process P23, in the battery control device 200, for example, the temperature Tc of the battery cell 1 acquired in the process P21 by the phase change material state determination function F2 is the phase change temperature of the phase change material 2 stored in the storage device 202. It is determined whether or not it is lower than Tpc.

From time x6 to x7, the battery control device 200 determines that the temperature Tc of the battery cell 1 is lower than the phase change temperature Tpc of the phase change material 2 (YES), and executes the process P41 shown in FIG. 7C. .. In the process P41, the battery control device 200 is the temperature of the battery cell 1 when the battery cell 1 is rapidly charged based on the following formula (3) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T.

T = Tc + Qrc / (m × c) ... (3)

In the above formula (3), Tc [° C.] is the temperature of the battery cell 1 acquired in the process P21, Qrc [J] is the total heat capacity of the battery cell 1 during rapid charging, and m [kg] is. The total mass of the battery cell 1 and the phase change material 2, c [J / kg · K], is the specific heat of the battery cell 1 and the phase change material 2 at a temperature excluding the phase change temperature Tpc.

Next, in the battery control device 200, for example, whether the temperature T of the battery cell 1 at the time of rapid charging calculated by the process P41 by the phase change material state determination function F2 is equal to or less than the phase change temperature Tpc of the phase change material 2. The process P42 for determining whether or not to perform is executed. In the process P42, when the temperature T of the battery cell 1 at the time of rapid charging calculated in the process P41 is equal to or less than the phase change temperature Tpc of the phase change material 2 (YES), the battery control device 200 has the process P51 shown in FIG. 7D. To execute.

In process P51, the battery control device 200 outputs a control signal CS to the battery pack 100 by, for example, the control condition determination function F3, and starts rapid charging of the battery cell 1. Next, the battery control device 200 executes the process P52 for acquiring the temperature Tc of the battery cell 1 by, for example, the data processing and storage function F1. Next, the battery control device 200 determines, for example, whether or not the temperature Tc of the battery cell 1 acquired in the process P52 is equal to the phase change temperature Tpc of the phase change material 2 by the phase change material state determination function F2. Process P53 is executed.

From time x6 to time x7 shown in FIG. 5, the temperature Tc of the battery cell 1 is lower than the phase change temperature Tpc of the phase change material 2. Therefore, in the process P53, the battery control device 200 determines that the temperature Tc of the battery cell 1 and the phase change temperature Tpc of the phase change material 2 are not equal (NO), and executes the process P54. In the process P54, the battery control device 200 clears the counter value N to zero by, for example, the data processing and storage function F1.

Next, the battery control device 200 executes the process P56 for calculating the amount of heat Qpmcc [J] stored as latent heat in the phase change material 2 when the battery cell 1 is charged. In the process P56, the battery control device 200 calculates the calorific value Qpcmc based on the following equation (4) by, for example, the state determination function F2 of the phase changing material. In the following equation (4), N is the counter value (natural number) set in the process P54 or the process P55, and Qrcb [J / s] is the amount of heat per unit time during rapid charging of the battery cell 1. is there.

Qpccc = N × Qrcb ... (4)

Here, since the counter value N is zero in the process P54, 0 [J] is calculated as the amount of heat Qpcmc accumulated as latent heat in the phase change material 2 when the battery cell 1 is charged. Next, the battery control device 200 executes a process P57 for storing the heat amount Qpcmc calculated in the process P56 in the storage device 202 by, for example, the data processing and storage function F1. Next, the battery control device 200 executes a process P58 for determining whether or not the rapid charging of the battery cell 1 is completed by, for example, the data processing and storage function F1.

In the process P58, when the battery control device 200 determines, for example, by the data processing and storage function F1 that the rapid charging of the battery cell 1 is not completed (NO), the battery control device 200 executes the process P58 again from the process P52. On the other hand, in the process P58, when the battery control device 200 determines that the rapid charging of the battery cell 1 is completed (YES), for example, the control condition determination function F3 outputs a control signal CS to the battery pack 100 to output a control signal CS. The quick charging of the battery cell 1 is terminated.

From time x7 to time x8 shown in FIG. 5, the phase change material 2 changes from the solid phase to the liquid phase to absorb latent heat, and the temperature Tc of the battery cell 1 is the phase change temperature Tpc of the phase change material 2. Is roughly equal. Then, in the process P53, the battery control device 200 determines that the temperature Tc of the battery cell 1 acquired in the process P52 and the phase change temperature Tpc of the phase change material 2 are equal (YES), and executes the process P55. In the process P55, the battery control device 200 sets the counter value N to N + 1 by, for example, the data processing and storage function F1.

Next, as described above, the battery control device 200 calculates the amount of heat Qpcmc accumulated as latent heat in the phase change material 2 at the time of charging the battery cell 1 based on the equation (4) in the process P56, and in the process P57. The calorific value Qpcmc is stored in the storage device 202. Here, since the counter value N is a natural number of 1 or more in the process P55, N × Qrcb is calculated as the amount of heat Qpcmc accumulated as latent heat in the phase change material 2 when the battery cell 1 is charged. As a result, the amount of heat Qpcmc accumulated as latent heat in the phase change material 2 between the time x7 and the time x8 can be calculated, and the state of the phase change of the phase change material 2 can be grasped.

After the time x8 shown in FIG. 5, the phase change material 2 becomes a liquid phase, and the temperature T of the phase change material 2 and the battery cell 1 rises to be higher than the phase change temperature Tpc of the phase change material 2. Then, in the process P53, the battery control device 200 determines that the temperature Tc of the battery cell 1 and the phase change temperature Tpc of the phase change material 2 are not equal (NO), and in the process P58, the battery control device 200 determines that the battery cell 1 Process P52 to process P58 are repeatedly executed until it is determined that the charging of the battery cell 1 is completed (YES), and the battery cell 1 is rapidly charged. Further, in the process P58, when the battery control device 200 determines that the charging of the battery cell 1 is completed (YES), the process shown in FIG. 7D is terminated, and the process shown in FIG. 6 is newly started.

On the other hand, in the process P42 shown in FIG. 7C, when the temperature T at the time of rapid charging of the battery cell 1 calculated in the process P41 is higher than the phase change temperature Tpc of the phase change material 2 (NO), the battery control device 200 , Process P43 is executed. In the process P43, the battery control device 200 is the temperature of the battery cell 1 when the battery cell 1 is rapidly charged based on the following formula (5) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T.

T = Tpc + (Qrc-Qpcmt) / (m × c) ... (5)

In the above formula (5), Tpc is the phase change temperature of the phase change material 2, Qrc [J] is the total heat capacity of the battery cell 1 during rapid charging, and Qpcmt [J] is the phase change material 2. The total amount of heat that can be absorbed as latent heat, m [kg] is the total mass of the battery cell 1 and the phase change material 2, and c [J / kg · K] is the battery cell 1 and the phase at a temperature excluding the phase change temperature Tpc. This is the specific heat of the changing material 2.

Next, in the battery control device 200, for example, the temperature T of the battery cell 1 at the time of rapid charging calculated by the process P43 by the phase change material state determination function F2 is the upper limit temperature of the operating temperature range, for example, 60 [° C.] or less. The process P44 for determining whether or not is is executed. In the process P44, when the temperature T of the battery cell 1 at the time of quick charging calculated in the process P43 is 60 [° C.] or less (YES), the battery control device 200 is the battery cell shown in FIG. 7D as described above. Perform a quick charge of 1.

On the other hand, in the process P44, when the temperature T of the battery cell 1 at the time of quick charging calculated in the process P43 is higher than 60 [° C.] (NO), the battery control device 200 uses, for example, the data processing and storage function F1 to obtain a battery. The process P45 for calculating the temperature T at the time of normal charging of the cell 1 is executed. In the process P45, the battery control device 200 normally charges the battery cell 1 based on the following formula (6) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T.

T = Tpc + (Qtc-Qpcmt) / (m × c) ... (6)

In the above formula (6), Tpc is the phase change temperature of the phase change material 2, Qtc [J] is the total heat of the battery cell 1 during normal charging, and Qpcmt [J] is the latent heat of the phase change material 2. The total amount of heat that can be absorbed, m [kg] is the total mass of the battery cell 1 and the phase change material 2, and c [J / kg · K] is the phase change of the battery cell 1 and the phase change at a temperature excluding the phase change temperature Tpc. This is the specific heat of material 2.

Next, in the battery control device 200, for example, the temperature T of the battery cell 1 at the time of normal charging calculated by the process P45 by the phase change material state determination function F2 is the upper limit temperature of the operating temperature range, for example, 60 [° C.] or less. The process P46 for determining whether or not is is executed. In the process P46, when the temperature T of the battery cell 1 during normal charging calculated in the process P45 is 60 [° C.] or less (YES), the battery control device 200 is subjected to, for example, the control condition determination function F3 to the battery pack 100. The control signal CS is output to the battery cell 1, and the process P47 for normally charging the battery cell 1 is executed.

On the other hand, in the process P46, when the temperature T of the battery cell 1 at the time of normal charging calculated in the process P45 is higher than 60 [° C.] (NO), the battery control device 200 executes the process P48. In the process P48, the battery control device 200 outputs a control signal CS to the battery pack 100 by, for example, the control condition determination function F3 to perform a charge non-execution process in which the battery cell 1 is not charged, or the battery cell 1 The limited normal charging process for normally charging the battery cell 1 is executed until the temperature of the battery reaches the upper limit of the operating temperature range, for example, 60 [° C.].

Further, when charging of the battery cell 1 is started between the time x4 and the time x5 before the time x6 shown in FIG. 5, in the process P22 shown in FIG. 7A, the battery control device 200 is the temperature of the battery cell 1. It is determined that Tc and the phase change temperature Tpc of the phase change material 2 are equal (YES), and the process P31 shown in FIG. 7B is executed. In the process P31, the battery control device 200 is stored as latent heat in the phase change material 2 based on the data stored in the storage device 202 and the following equation (7) by, for example, the phase change material state determination function F2. Calculate the calorific value Qpcm [J].

Qpcm = Σ (Q ₁ + Q ₂ + Q ₃ + ... + Q _n ) + Qpcmc ・・・ (7)

In the above equation (7), Q ₁ , Q ₂ , Q ₃ , ..., Q _n [J / s] is the time series data of the amount of heat released from the phase change material 2 per unit time, and Qpccm [J] is This is the amount of heat accumulated as latent heat in the phase change material 2 when the battery cell 1 is charged. Next, the battery control device 200 sets the cell temperature T when the battery cell 1 is rapidly charged by, for example, the data processing and storage function F1, based on the data stored in the storage device 202 and the following formula (8). The process P32 for calculating is executed.

T = Tpc + {Qrc- (Qpcmt-Qpcm)} / (m × c) ... (8)

In the above formula (8), Tpc is the phase change temperature of the phase change material 2, Qrc [J] is the total heat capacity of the battery cell 1 during rapid charging, and Qpcmt [J] is the phase change material 2. Qpcm [J] is the total amount of heat that can be absorbed as latent heat, Qpcm [J] is the amount of heat stored as latent heat in the phase change material 2, and m [kg] is the total mass of the battery cell 1 and the phase change material 2, c [J / kg]. [K] is the specific heat of the battery cell 1 and the phase change material 2 at a temperature other than the phase change temperature Tpc.

Next, in the battery control device 200, for example, the temperature T of the battery cell 1 at the time of rapid charging calculated by the process P32 by the phase change material state determination function F2 is the upper limit temperature of the operating temperature range, for example, 60 [° C.] or less. The process P33 for determining whether or not is is executed. In the process P33, when the temperature T of the battery cell 1 at the time of quick charging calculated in the process P32 is 60 [° C.] or less (YES), the battery control device 200 is the battery cell shown in FIG. 7D as described above. Perform a quick charge of 1.

On the other hand, in the process P33, when the temperature T of the battery cell 1 at the time of rapid charging calculated in the process P32 is higher than 60 [° C.] (NO), the battery control device 200 uses, for example, the data processing and storage function F1 to obtain a battery. The process P34 for calculating the temperature T at the time of normal charging of the cell 1 is executed. In the process P34, the battery control device 200 normally charges the battery cell 1 based on the following formula (9) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T.

T = Tpc + {Qtc- (Qpcmt-Qpcm)} / (m × c)
... (9)

In the above formula (9), Tpc is the phase change temperature of the phase change material 2, Qtc [J] is the total heat of the battery cell 1 during normal charging, and Qpcmt [J] is the latent heat of the phase change material 2. The total amount of heat that can be absorbed, Qpcm [J] is the amount of heat stored as latent heat in the phase change material 2, and m [kg] is the total mass of the battery cell 1 and the phase change material 2, c [J / kg. [K] is the specific heat of the battery cell 1 and the phase change material 2 at a temperature other than the phase change temperature Tpc.

Next, in the battery control device 200, for example, the temperature T of the battery cell 1 at the time of normal charging calculated by the process P34 by the phase change material state determination function F2 is the upper limit temperature of the operating temperature range, for example, 60 [° C.] or less. The process P35 for determining whether or not is is executed. In the process P35, when the temperature T of the battery cell 1 during normal charging calculated in the process P34 is 60 [° C.] or less (YES), the battery control device 200 is subjected to, for example, the control condition determination function F3 to the battery pack 100. The control signal CS is output to the battery cell 1, and the process P36 for normally charging the battery cell 1 is executed.

On the other hand, in the process P35, when the temperature T of the battery cell 1 at the time of normal charging calculated in the process P34 is higher than 60 [° C.] (NO), the battery control device 200 executes the process P37. In the process P37, the battery control device 200 outputs a control signal CS to the battery pack 100 by, for example, the control condition determination function F3 to perform a charge non-execution process in which the battery cell 1 is not charged, or the battery cell 1 The limited normal charging process for normally charging the battery cell 1 is executed until the temperature of the battery reaches the upper limit of the operating temperature range, for example, 60 [° C.].

Further, when charging of the battery cell 1 is started between the time x3 and the time x4 before the time x4 shown in FIG. 5, in the process P22 shown in FIG. 7A, the battery control device 200 is the temperature of the battery cell 1. It is determined that Tc and the phase change temperature Tpc of the phase change material 2 are not equal (NO), and the process P23 is executed. In the process P23, the battery control device 200 determines that the temperature Tc of the battery cell 1 is higher than the phase change temperature Tpc of the phase change material 2 (NO) by, for example, the phase change material state determination function F2, and performs the process P24. Execute.

In the process P24, the battery control device 200 is the temperature of the battery cell 1 when the battery cell 1 is rapidly charged based on the above formula (3) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T. Next, in the battery control device 200, for example, the temperature T of the battery cell 1 at the time of rapid charging calculated by the process P24 by the phase change material state determination function F2 is the upper limit temperature of the operating temperature range, for example, 60 [° C.] or less. The process P25 for determining whether or not is is executed. In the process P25, when the temperature T of the battery cell 1 at the time of quick charging calculated in the process P24 is 60 [° C.] or less (YES), the battery control device 200 is the battery cell shown in FIG. 7D as described above. Perform a quick charge of 1.

On the other hand, in the process P25, when the temperature T of the battery cell 1 at the time of rapid charging calculated in the process P24 is higher than 60 [° C.] (NO), the battery control device 200 uses, for example, the data processing and storage function F1 to obtain a battery. The process P26 for calculating the temperature T at the time of normal charging of the cell 1 is executed. In the process P26, the battery control device 200 normally charges the battery cell 1 based on the following formula (10) stored in the storage device 202 by, for example, the data processing and storage function F1. Calculate T.

T = Tpc + Qtc / (m × c) ... (10)

In the above formula (10), Tpc is the phase change temperature of the phase change material 2, Qtc [J] is the total calorific value of the battery cell 1 during normal charging, and m [kg] is the phase change with the battery cell 1. The total mass of the material 2, c [J / kg · K], is the specific heat of the battery cell 1 and the phase change material 2 at a temperature excluding the phase change temperature Tpc.

Next, in the battery control device 200, for example, the temperature T of the battery cell 1 during normal charging calculated by the process P26 by the phase change material state determination function F2 is equal to or less than the upper limit temperature of the operating temperature range, for example, 60 [° C.]. The process P27 for determining whether or not is is executed. In the process P27, when the temperature T of the battery cell 1 during normal charging calculated in the process P26 is 60 [° C.] or less (YES), the battery control device 200 is subjected to, for example, the control condition determination function F3 to the battery pack 100. The control signal CS is output to the battery cell 1, and the process P28 for normally charging the battery cell 1 is executed.

On the other hand, in the process P27, when the temperature T of the battery cell 1 at the time of normal charging calculated in the process P26 is higher than 60 [° C.] (NO), the battery control device 200 executes the process P29. In the process P29, the battery control device 200 outputs a control signal CS to the battery pack 100 by, for example, the control condition determination function F3 to perform a charge non-execution process in which the battery cell 1 is not charged, or the battery cell 1 The limited normal charging process for normally charging the battery cell 1 is executed until the temperature of the battery reaches the upper limit of the operating temperature range, for example, 60 [° C.].

Hereinafter, the operation and effect of the battery control device 200 of the present embodiment will be described with reference to FIG. FIG. 8 is a graph illustrating the effect of suppressing the temperature rise of the battery cell 1 constituting the battery pack 100 by the battery control device 200 of FIG.

As described above, the battery control device 200 of the present embodiment is a device that controls a battery, that is, a battery pack 100 and a battery cell 1, which are arranged so as to be thermally conductive with respect to the phase change material 2. The battery control device 200 calculates the amounts of heat Qn, Qpmcc, Qpcmt, and Qpcm absorbed or released as latent heat by the phase changing material 2 based on the phase changing temperature Tpc of the phase changing material 2 and the temperature Tc of the battery cell 1. A processing device 201 that determines the charging conditions of the battery based on this amount of heat is provided.

With this configuration, the battery control device 200 of the present embodiment phase-changes the temperature rise of the battery including the battery cell 1 based on the amount of heat Qn, Qpmcc, Qpcmt, Qpcm absorbed or released as latent heat by the phase-changing material 2. It can be suppressed within a specific temperature range in the vicinity of the phase change temperature Tpc of the material 2. In other words, the battery control device 200 of the present embodiment estimates the state of the phase change material 2 based on the phase change temperature Tpc of the phase change material 2 and the time series data of the temperature Tc of the battery including the battery cell 1. The amount of heat Qpcmt that the current phase change material 2 can absorb as latent heat can be grasped.

Therefore, according to the battery control device 200 of the present embodiment, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effective than before. The temperature rise of the battery cell 1 can be effectively suppressed. As a result, as shown in FIG. 8, when the battery pack 100 is controlled by the battery control device 200 and charging / discharging is repeated, the temperature Tc of the battery including the battery cell 1 is set to the upper limit of the operating temperature range of the battery cell 1. It can be more reliably maintained within a certain temperature range of 60 [° C.] or less.

Further, in the battery control device 200 of the present embodiment, the processing device 201 is based on the amount of heat Qrc generated by the battery cell 1 during rapid charging when the temperature Tc of the battery including the battery cell 1 is lower than the phase change temperature Tpc. Then, the temperature T of the battery at the time of quick charging is calculated. Then, the processing device 201 determines the charging condition of the battery including the battery cell 1 to be rapid charging when the calculated temperature T of the battery at the time of rapid charging is equal to or less than the phase changing temperature Tpc of the phase changing material 2.

With this configuration, the battery control device 200 of the present embodiment phase-changes the temperature Tc of the battery cell 1 based on the amount of heat Qrc generated by the battery, that is, the battery cell 1 when the battery, that is, the battery pack 100 is rapidly charged. The temperature can be set to Tpc or less. Therefore, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effectively performed than before, and the temperature of the battery cell 1 rises. Can be effectively suppressed.

Further, in the battery control device 200 of the present embodiment, in the processing device 201, the calculated temperature T of the battery including the battery cell 1 at the time of rapid charging is higher than the phase change temperature Tpc, and is equal to or less than the upper limit temperature of the operating temperature range of the battery. If, the battery charging condition is determined to be quick charging.

With this configuration, the battery control device 200 of the present embodiment sets the temperature Tc of the battery including the battery cell 1 to the upper limit of the operating temperature range of the battery cell 1 when the battery, that is, the battery pack 100 is rapidly charged. It can be reliably maintained within the temperature range of [° C] or less. Therefore, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effectively performed than before, and the temperature of the battery cell 1 rises. Can be effectively suppressed.

Further, in the battery control device 200 of the present embodiment, when the temperature Tc of the battery including the battery cell 1 is equal to the phase change temperature Tpc, the processing device 201 undergoes rapid charging based on the amount of heat Qrc generated by the battery cell 1. The temperature of the battery cell 1 of the above is calculated. Then, when the calculated temperature T of the battery cell 1 at the time of quick charging is equal to or less than the upper limit temperature of the operating temperature range of the battery cell 1, the processing device 201 determines the charging condition of the battery to be quick charging.

With this configuration, the battery control device 200 of the present embodiment uses the battery temperature as the operating temperature of the battery cell 1 even if quick charging is performed when the temperature Tc of the battery including the battery cell 1 is equal to the phase change temperature Tpc. It can be more reliably maintained within the temperature range of 60 [° C.] or lower, which is the upper limit of the range. Therefore, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effectively performed than before, and the temperature of the battery cell 1 rises. Can be effectively suppressed.

Further, in the battery control device 200 of the present embodiment, the processing device 201 is rapidly charged based on the amount of heat Qrc generated by the battery cell 1 when the temperature Tc of the battery including the battery cell 1 is higher than the phase change temperature Tpc. Calculate the temperature of the battery cell 1 at that time. Then, the processing device 201 determines the charging condition of the battery, that is, the battery pack 100 to be rapid charging when the calculated temperature T of the battery cell 1 at the time of rapid charging is equal to or less than the upper limit temperature of the operating temperature range of the battery cell 1.
Can be done.

With this configuration, the battery control device 200 of the present embodiment can keep the battery temperature Tc even if the battery pack 100 is rapidly charged when the temperature Tc of the battery including the battery cell 1 is higher than the phase change temperature Tpc. , The temperature range of 60 [° C.] or less, which is the upper limit of the operating temperature range of the battery cell 1, can be reliably maintained. Therefore, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effectively performed than before, and the temperature of the battery cell 1 rises. Can be effectively suppressed.

Further, in the battery control device 200 of the present embodiment, the processing device 201 normally sets the charging conditions of the battery when the calculated temperature T of the battery including the battery cell 1 at the time of quick charging is higher than the upper limit temperature of the operating temperature range. Decide to charge.

With this configuration, the battery control device 200 of the present embodiment can select an appropriate charging condition, for example, quick charging or normal charging, according to the phase changing state of the phase changing material 2. Therefore, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the current control and the cooling control of the battery are more effectively performed than before, and the temperature of the battery cell 1 rises. Can be effectively suppressed.

As described above, according to the present embodiment, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, the temperature rise of the battery is effectively suppressed as compared with the conventional case. It is possible to provide a battery control device 200 capable of this.

[Embodiment 2]
Hereinafter, embodiments of the in-vehicle battery system of the present disclosure will be described with reference to FIGS. 1 to 8 and with reference to FIG. FIG. 9 is a schematic configuration diagram showing an embodiment of the vehicle-mounted battery system of the present disclosure. The in-vehicle battery system shown in FIG. 9 is mounted on a vehicle EV such as a hybrid vehicle or an electric vehicle, and includes a battery pack 100, a battery control device 200, and a host control device 300 shown in FIG. Since the configurations of the battery pack 100, the battery control device 200, and the host control device 300 are the same as the configurations described in the above-described embodiment, the description thereof will be omitted as appropriate.

The vehicle-mounted battery system of the present embodiment includes a battery control device 200, a phase change material 2, and a battery cell 1 controlled by the battery control device 200 and arranged so as to be thermally conductive to the phase change material 2. And a duct D that takes in outside air when the vehicle EV is traveling and supplies the outside air to the battery, that is, the battery pack 100. In the present embodiment, the host control device 300 periodically outputs information Inf including the speed of the vehicle EV to the battery control device 200 while the vehicle EV is running.

The battery control device 200 stores, for example, the processing device 201 stores the time-series data of the vehicle EV speed input from the host control device 300 in the storage device 202. The cooling condition of the battery, that is, the battery pack 100 has a correlation with the flow rate of the outside air taken into the duct D, and the flow rate of the outside air taken into the duct D has a correlation with the speed of the vehicle EV. Therefore, in the present embodiment, the correlation between the cooling condition of the battery cell 1 and the speed of the vehicle EV is obtained in advance, and the correlation is stored in the storage device 202.

According to the in-vehicle battery system of the present embodiment, not only the same effect as that of the battery control device 200 described above can be obtained, but also the correlation between the cooling condition of the battery pack 100 and the speed of the vehicle EV is obtained by the battery control device 200. The battery pack 100 can be controlled based on the above. Therefore, according to the present embodiment, when the latent heat of the phase change material 2 is used to absorb the heat of the battery including the battery cell 1, it is possible to effectively suppress the temperature rise of the battery as compared with the conventional case. An in-vehicle battery system can be provided.

Although the embodiment of the battery control device and the vehicle-mounted battery system according to the present disclosure has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment and deviates from the gist of the present disclosure. Any design changes, etc. to the extent that they are not included are included in this disclosure.

1 Battery cell (battery)
2-phase change material 100 Battery pack (battery)
200 Battery control device 201 Processing device D Duct EV Vehicle Qn Calorie Qpcm Calorie Qpcmc Calorie Qpcmt Calorie T Battery temperature Tc Battery temperature Tpc Phase change temperature

Claims

A battery control device that controls batteries arranged so that they can conduct heat with respect to a phase change material.
A processing device is provided that calculates the amount of heat absorbed or released as latent heat by the phase-changing material based on the phase-changing temperature of the phase-changing material and the temperature of the battery, and determines the charging conditions of the battery based on the amount of heat. A battery control device characterized by the fact that.
When the temperature of the battery is lower than the phase change temperature, the processing device calculates the temperature of the battery at the time of rapid charging based on the amount of heat, and the calculated temperature of the battery at the time of rapid charging is the said. The battery control device according to claim 1, wherein the charging condition of the battery is determined to be rapid charging when the temperature is equal to or lower than the phase change temperature of the phase changing material.
The processing device determines the charging condition of the battery to be rapid charging when the calculated temperature of the battery at the time of rapid charging is higher than the phase change temperature and is equal to or lower than the upper limit temperature of the operating temperature range of the battery. The battery control device according to claim 2, wherein the battery control device is characterized by the above.
The processing device calculates the temperature of the battery at the time of rapid charging based on the amount of heat when the temperature of the battery is equal to the phase change temperature, and the calculated temperature of the battery at the time of rapid charging is the battery. The battery control device according to claim 1, wherein the charging condition of the battery is determined to be rapid charging when the temperature is equal to or lower than the upper limit temperature of the operating temperature range of the above.
When the temperature of the battery is higher than the phase change temperature, the processing device calculates the temperature of the battery at the time of rapid charging based on the amount of heat, and the calculated temperature of the battery at the time of rapid charging is the said. The battery control device according to claim 1, wherein the charging condition of the battery is determined to be rapid charging when the temperature is equal to or lower than the upper limit temperature of the operating temperature range of the battery.
The third aspect of the present invention is characterized in that the processing device determines the charging condition of the battery to be normal charging when the calculated temperature of the battery at the time of rapid charging is higher than the upper limit temperature of the operating temperature range. Item 5. The battery control device according to any one of items 5.
The battery control device according to any one of claims 1 to 6, a phase change material, a battery controlled by the battery control device and arranged to be thermally conductive with respect to the phase change material, and a vehicle. An in-vehicle battery system including a duct that takes in outside air and supplies it to the battery during traveling.