JP6740793B2 - In-vehicle power supply control device - Google Patents

Description

The present invention relates to an in-vehicle power supply control device.

A battery module, which is a DC power supply, is mounted on a vehicle that uses a rotating electric machine as a drive source, such as an electric vehicle or a hybrid vehicle. The battery module may be divided (subdivided) into a plurality of battery packs for the purpose of diversifying the layout. For example, as in Patent Document 1, a plurality of battery packs are connected in parallel.

As shown in the discharge period of FIG. 6, the voltage (CCV) between terminals of each battery pack is basically equal because of the parallel connection (CCV1=CCV2). On the other hand, a difference occurs in the open circuit voltage (OCV) of each battery pack (OCV1≠OCV2) based on the difference in the internal resistance of each battery pack (including the polarization voltage for convenience). For example, in a battery pack having a relatively high internal resistance, the current tends to be squeezed during discharge (poor output), so that the open circuit voltage OCV remains relatively high.

In parallel connection, it is known that when an open circuit voltage difference (OCV difference) occurs, a so-called circulating current occurs and the OCV difference is eliminated. FIG. 7 illustrates a circuit diagram for explaining the circulating current. For convenience, the internal resistance and the polarization voltage are collectively indicated by r(r1, r2). As shown in this figure, in addition to the current I _L flowing from the battery packs 100A and 100B to the load 102, the battery pack 100A having a relatively high open circuit voltage (OCV1) has a relatively low open circuit voltage (OCV2). A current I _C (circulation current) flows through the battery pack 100B, and the OCV difference between the battery packs 100A and 100B is reduced (balanced).

JP, 2010-246285, A

By the way, when the power demand on the load side increases, for example, the current I _L carried out from the battery module to the load side at the time of discharging increases and the circulating current I _C decreases. When such a state continues for a long period of time, the open circuit voltage difference between the battery packs gradually increases in accordance with the internal resistance difference.

For example, as shown at time t0 (Ready-OFF) in FIG. 6, when charging/discharging of the battery module is stopped in a state where the open circuit voltage difference between the battery packs is widened, so-called polarization in each battery pack is eliminated. Enter the relaxation period. As the relaxation period elapses, the terminal voltage (CCV) of each battery pack approaches the open circuit voltage (OCV). As described above, since there is a potential difference in the open circuit voltage (OCV) of each battery pack, a potential difference occurs between the battery packs as the relaxation period elapses (with the elimination of polarization). For example, in FIG. 6, a potential difference of ΔV1-ΔV2 occurs at time t1 (Ready-ON).

When the vehicle is started and the system main relay of each battery pack is switched from the disconnection state to the connection state in a state where there is a potential difference in each battery pack, each battery pack becomes conductive and based on the potential difference (OCV difference). An electric current flows between the battery packs. If the potential difference (OCV difference) between the battery packs is large, a large current flows between the battery packs, which may lead to welding of the system main relay.

Therefore, an object of the present invention is to provide an in-vehicle power supply control device capable of suppressing an increase in open circuit voltage difference (OCV difference) between battery packs.

The present invention relates to a vehicle-mounted power supply control device that controls charge/discharge power between a load and a battery module including a plurality of battery packs connected in parallel. The control device includes a counter, a resistance calculation unit, and a power upper limit value calculation unit. The counter is a continuous discharge time which is a duration time when the discharge current value from the battery module to the load is a threshold value or more, and a continuous charge time which is a duration time when the charge current value from the load to the battery module is a threshold value or more. Time is measured. The resistance calculator determines the internal resistance of the plurality of battery packs. The power upper limit calculation unit lowers the discharge power upper limit from the battery module to the load according to the increase in the continuous discharge time, and the discharge according to the increase in the internal resistance difference between the battery packs. Increase the rate of reduction of the upper limit of electric power. Also, the charging power upper limit value from the load to the battery module is reduced according to the increase of the continuous charging time, and the charging power upper limit value is reduced according to the increase of the internal resistance difference between the battery packs. Increase the rate.

According to the present invention, the circulating current is secured by limiting the carry-out of the current to the load when the continuous charging/discharging time when the circulating current becomes scarce becomes long. Further, the allocation of the circulating current is increased (added) according to the internal resistance difference between the battery packs. As a result, it becomes possible to suppress the expansion of the OCV difference between the battery packs.

It is a figure which illustrates the power supply system containing the power supply control device which concerns on this embodiment. It is a figure which illustrates the hardware constitutions of the power supply control device which concerns on this embodiment. It is a figure which illustrates the functional block of the power supply control device which concerns on this embodiment. It is a flow chart which illustrates a discharge upper limit value setting flow by the power supply control device concerning this embodiment. It is a flow chart which illustrates a charging upper limit value setting flow by the power supply control device according to the present embodiment. It is a figure explaining an open circuit voltage difference. It is a circuit diagram explaining a circulating current.

FIG. 1 illustrates a power supply system including a power supply control device 10 according to this embodiment. The power supply system is mounted on a vehicle that uses a rotary electric machine MG (load) as a drive source, such as an electric vehicle or a hybrid vehicle. It should be noted that, in FIG. 1, a configuration that is less relevant to the present embodiment is omitted as appropriate.

The power supply system includes, in addition to the power supply control device 10, a battery module 12, a power control unit 14 (PCU), a rotary electric machine MG (load), and various sensors (current sensors 16A, 16B, 16C, voltage sensor 18). Composed.

The battery module 12 includes a plurality of battery packs 20A and 20B. Although only two battery packs 20A and 20B are shown in FIG. 1 to simplify the illustration, three or more battery packs may be provided. The plurality of battery packs 20A and 20B are connected in parallel.

The battery pack 20A includes a battery 22, a positive electrode side system main relay SMRB1, and a negative electrode side system main relay SMRG1. The battery pack 20B includes a battery 22, a positive electrode side system main relay SMRB2, and a negative electrode side system main relay SMRG2. The battery 22 is composed of, for example, a battery unit in which a plurality of cylindrical batteries are connected in parallel. The positive electrode side system main relays SMRB1 and SMRB2 and the negative electrode side system main relays SMRG1 and SMRG2 switch connection/disconnection between the battery 22 and the load (rotary electric machine MG). The switching command is transmitted from the power supply control device 10, for example.

The power control unit 14 (PCU) is provided between the battery module 12 and the rotary electric machine MG (load). The power control unit 14 includes a DC/DC converter and an inverter (not shown). During power running of the rotating electrical machine MG (load), the DC/DC converter boosts the DC voltage of the battery module 12, and the inverter converts the boosted DC power into AC power. During regeneration of the rotating electrical machine MG (load), the inverter converts (inverts) the AC power of the rotating electrical machine MG into DC power, and the DC/DC converter lowers the converted DC voltage. ON/OFF of a switching element (not shown) of the DC/DC converter or the inverter is controlled by the power supply control device 10. For example, on/off of the switching element is controlled based on a discharge power upper limit value Wout and a charge power upper limit value Win which will be described later.

The rotary electric machine MG (load) receives electric power from the battery module 12 and is driven (power running). When the vehicle is being braked, it is regeneratively driven to charge the battery module 12. The rotary electric machine MG is composed of, for example, a three-phase permanent magnet synchronous motor.

The power supply control device 10 controls charge/discharge power between the battery module 12 and the rotary electric machine MG (load). The power supply control device 10 is composed of, for example, an electronic control unit (ECU) which is a central processing unit of a vehicle. The power supply control device 10 (ECU) is composed of, for example, a computer. As illustrated in the hardware configuration diagram of FIG. 2, the power supply control device 10 includes a CPU 24 (Central Processing Unit), a memory 26, a hard disk drive 28 (HDD), an output unit 30 which is a display device such as a display, and input/output. An interface 32 is provided, and these devices are connected to each other via a system bus.

The hard disk drive 28 is a computer-readable non-transitory storage medium that stores a program for executing a discharge upper limit value setting flow and a charge upper limit value setting flow described later. When the program is executed by the CPU 24, the computer configuring the power supply control device 10 functions as each functional unit illustrated in FIG.

With reference to FIG. 3, the functional unit of the power supply control device 10 includes a continuous discharge time counter 34, a continuous charge time counter 36, a reference upper limit value calculation unit 38, a resistance calculation unit 40, a limit coefficient calculation unit 42, and a power upper limit value calculation unit. 44 and a start prohibition flag setting unit 46. The reference upper limit value calculation unit 38, the limit coefficient calculation unit 42, and the power upper limit value calculation unit 44 may be collectively regarded as an upper limit value calculation unit. The functional units described above are illustrated virtually or independently for convenience of description. For example, resources such as the CPU 24, the memory 26, and the hard disk drive 28 are appropriately allocated to configure respective functional units.

A current value I _L flowing between the battery module 12 and the rotary electric machine MG (load) is sent from the current sensor 16C to the continuous discharge time counter 34. The continuous discharge time counter 34 counts the continuous discharge time Td, which is the duration time during which the value of the discharge current from the battery module 12 to the rotary electric machine MG (load) detected by the current sensor 16C is equal to or greater than a predetermined threshold value. If the discharge current value becomes less than the threshold value during this counting, the count of the continuous discharge time Td is reset to zero. The discharge current value may be a positive current value detected by the current sensor 16C. Further, the threshold value of the discharge current that triggers the start of counting the continuous discharge time Td is appropriately determined according to the ratio of the circulating current amount flowing between the battery packs 20A and 20B and the current carried to the rotary electric machine MG (load). ..

As described above, when the carry-out current I _L from the battery module 12 to the rotary electric machine MG (load) increases, the circulating current I _C between the battery packs 20A and 20B decreases correspondingly, and the inside of the battery packs 20A and 20B decreases. The open circuit voltage difference (OCV difference) between the battery packs 20A and 20B increases in accordance with the resistance (including the polarization voltage for convenience). For example, in a battery pack having a relatively high internal resistance, the current tends to be squeezed during discharge (poor output), so the open circuit voltage OCV remains relatively high. The continuous discharge time counter 34 measures such a time during which the open circuit voltage difference increases as the continuous discharge time Td.

Similar to the continuous discharge time counter 34, the continuous charge time counter 36 is supplied with the current value I _L flowing between the battery module 12 and the rotary electric machine MG (load) from the current sensor 16C. The continuous charge time counter 36 counts the continuous charge time Tc, which is the duration time during which the value of the charge current from the rotary electric machine MG (load) to the battery module 12 detected by the current sensor 16C is equal to or greater than a predetermined threshold value. Further, during this counting, if the charging current value is less than the threshold value (the current value is closer to 0 than the threshold value), the continuous charging time count is reset to 0. The threshold value of the charging current that triggers the start of counting the continuous charging time Tc depends on the ratio between the circulating current amount flowing between the battery packs 20A and 20B and the charging current flowing from the rotary electric machine MG (load) into the battery module 12. It is determined as appropriate.

As described above, when the current sensor 16C detects the discharge current value as a positive current value, the charging current value is a negative current value because the current flows from the rotary electric machine MG (load) to the battery module 12. To be detected. Based on this, in order to facilitate understanding of the correspondence relationship with the discharge current value, the charge current value will be described below based on the absolute value of the detected value of the current sensor 16C as appropriate.

For example, the case where the charging current value is equal to or higher than the predetermined threshold value refers to the case where the charging current value increases negatively, that is, the case where the absolute value of the charging current value is equal to or higher than the predetermined threshold value. The case where the charging current value is less than the threshold value means that the charging current value is on the 0 side of the threshold value, that is, the absolute value of the charging current value is less than the absolute value of the predetermined threshold value.

When the charging current from the rotary electric machine MG (load) to the battery module 12 increases, the open circuit voltage difference (OCV difference) between the battery packs 20A and 20B increases due to the internal resistance difference. For example, in a battery pack having a relatively high internal resistance, the charging current is restricted, so that the recovery of the open circuit voltage OCV is relatively delayed. The continuous charging time counter 36 measures the time during which the open circuit voltage difference increases as the continuous charging time Tc.

The reference upper limit value calculation unit 38 obtains the reference discharge upper limit value Wout0 and the reference charge upper limit value Win0 according to the continuous discharge time Td and the continuous charge time Tc. The reference upper limit value calculation unit 38 stores a reference discharge upper limit value map (not shown) in which the correspondence relationship between the continuous discharge time Td and the reference discharge upper limit value Wout0 is stored. The reference discharge upper limit value map is set such that the reference discharge upper limit value Wout0 is lowered (throttled) as the continuous discharge time Td increases. For example, the reference discharge upper limit value Wout0 is set to decrease in inverse proportion to the continuous discharge time Td. As will be described later, the discharge power upper limit value Wout is lowered by lowering the reference discharge upper limit value Wout0.

Further, the reference upper limit value calculation unit 38 stores a reference charge upper limit value map (not shown) in which the correspondence relationship between the continuous charging time Tc and the reference charge upper limit value Win0 is stored. The reference charge upper limit value map is set such that the reference charge upper limit value Win0 is lowered (throttled) as the continuous charging time Tc increases. For example, the reference charging upper limit value Win0 is set to decrease in inverse proportion to the continuous charging time Tc.

As described above, the charging current is represented by a negative current value. Therefore, when the reference charging upper limit value Win0 is lowered in accordance with the increase in the continuous charging time Tc, it decreases negatively (close to 0). That is, it means that the absolute value of the reference charge upper limit value Win0 decreases. As will be described later, the reference charging upper limit value Win0 is lowered, so that the charging power upper limit value Win is lowered (closed to the 0 side).

The current value of the battery pack 20A is sent from the current sensor 16A to the resistance calculation unit 40. Further, the current value of the battery pack 20B is sent from the current sensor 16B. Further, the voltage VL of the smoothing capacitor 48 is sent from the voltage sensor 18.

The resistance calculator 40 calculates (estimates) the internal resistance of each of the battery packs 20A and 20B based on the values obtained from the various sensors. For example, the internal resistance r1 of the battery pack 20A is calculated (estimated) from the current value of the current sensor 16A and the voltage value of the voltage sensor 18. Similarly, the internal resistance r2 of the battery pack 20B is calculated (estimated) from the current value of the current sensor 16B and the voltage value of the voltage sensor 18.

The restriction coefficient calculation unit 42 calculates the internal resistance difference Δr based on the internal resistances r1 and r2 of the battery packs 20A and 20B calculated by the resistance calculation unit 40. If three or more battery packs 20 are provided, the difference between the minimum internal resistance and the maximum internal resistance is calculated.

Further, the limiting coefficient calculating unit 42 obtains the discharging limiting coefficient Kout and the charging limiting coefficient Kin based on the internal resistance difference Δr of the battery packs 20A and 20B. As described above, the larger the internal resistance difference Δr, the wider the open circuit voltage difference (OCV difference) between the battery packs 20A and 20B. Therefore, here, the allocation of the circulating current I _C is increased or decreased according to the internal resistance difference.

The discharge restriction coefficient Kout is a coefficient for increasing the reduction rate of the discharge power upper limit value Wout, and is given a numerical value of 1 or less, for example. The limit coefficient calculation unit 42 stores a discharge limit coefficient map (not shown) in which the correspondence between the internal resistance difference Δr of the battery packs 20A and 20B and the discharge limit coefficient Kout is stored. For example, in the discharge restriction coefficient map, the reduction rate by the discharge restriction coefficient Kout becomes higher (takes a value close to 0) as the internal resistance difference Δr of the battery packs 20A and 20B increases.

The charge restriction coefficient Kin is a coefficient for increasing the reduction rate of the charge power upper limit Win, and is given a numerical value of 1 or less, for example. The limit coefficient calculating unit 42 stores a charge limit coefficient map (not shown) in which the correspondence between the internal resistance difference Δr of the battery packs 20A and 20B and the charge limit coefficient Kin is stored. For example, in the charge restriction coefficient map, the reduction rate by the charge restriction coefficient Kin becomes higher (takes a value close to 0) as the internal resistance difference Δr of the battery packs 20A and 20B increases.

The power upper limit value calculation unit 44 acquires the reference discharge upper limit value Wout0 and the reference charge upper limit value Win0 from the reference upper limit value calculation unit 38, and also acquires the discharge restriction coefficient Kout and the charge restriction coefficient Kin from the restriction coefficient calculation unit 42. The power upper limit value calculation unit 44 calculates the final discharge power upper limit value Wout and the charging power upper limit value Win from these values. For example, the discharge power upper limit value Wout is obtained by multiplying the reference discharge upper limit value Wout0 by the discharge limiting coefficient Kout. Similarly, the charging power upper limit Win is obtained by multiplying the reference charging upper limit Win0 by the charging limit coefficient Kin.

The discharge power upper limit value Wout and the charging power upper limit value Win limit the discharge power output from the power control unit 14 to the discharge power upper limit value Wout or less, and the charging power (absolute value) of the charging power upper limit value Win( Absolute value) Limited to the following.

<Flow of discharge upper limit value setting>
FIG. 4 illustrates a discharge upper limit value setting flow according to the present embodiment. The start trigger of the flow is, for example, when the system of the vehicle is activated (at the time of Ready-On). The initial value of the continuous discharge time Td is 0.

Further, this flow is forcibly terminated when the system of the vehicle is shut down (at the time of Ready-Off). At this time, whether or not the system can be started next time is determined based on the value (0 or 1) of the start prohibition flag at the time of termination (when shutting off).

The continuous discharge time counter 34 determines whether or not the current value I _L acquired from the current sensor 16C is greater than or equal to the discharge threshold Ith_D (S10). Current value I _L is is less than the discharge threshold Ith_D is a reference discharge limit Wout0 set to 0 (S12). As a result, the discharge power upper limit value Wout, which is the product of the reference discharge upper limit value Wout0 and the discharge limit coefficient Kout, is set to zero. Further, the continuous discharge time counter 34 sets (resets) the continuous discharge time Td to 0 (S14). Further, the power upper limit value calculation unit 44 sets the set value of the start prohibition flag setting unit 46 to 0 (invalid) in response to the reference discharge upper limit value Wout0 being 0 (S16). The start prohibition flag will be described later. After waiting for a predetermined time (S18), the process returns to step S10.

In step S10, the current value I _L is, if the discharge threshold Ith_D than the count of the continuous discharge time Td is started by continuous discharge time counter 34 (S20). For example, the continuous discharge time Td at step S10 is incremented.

Next, the reference upper limit value calculation unit 38 obtains the reference discharge upper limit value Wout0 based on the continuous discharge time Td and the reference discharge upper limit value map (S22). Subsequently, the resistance calculator 40 obtains the internal resistance value r1 of the battery pack 20A from the current value of the current sensor 16A and the voltage value of the voltage sensor 18. Further, the internal resistance value r2 of the battery pack 20B is obtained from the current value of the current sensor 16B and the voltage value of the voltage sensor 18.

The restriction coefficient calculation unit 42 acquires the internal resistance value r1 of the battery pack 20A and the internal resistance value r2 of the battery pack 20B from the resistance calculation unit 40, and obtains the internal resistance difference Δr between them (S24). Further, the limiting coefficient calculation unit 42 obtains the discharging limiting coefficient Kout based on the internal resistance difference Δr and the discharging limiting coefficient map (S26).

The power upper limit value calculation unit 44 acquires the reference discharge upper limit value Wout0 from the reference upper limit value calculation unit 38, and also acquires the discharge limit coefficient Kout from the limit coefficient calculation unit 42. Further, the power upper limit value calculation unit 44 multiplies the reference discharge upper limit value Wout0 by the discharge limiting coefficient Kout to calculate the final discharge power upper limit value Wout (S28). On/off operation of the switching element (not shown) of the power control unit 14 is controlled based on the calculated discharge power upper limit value Wout.

Further, the power upper limit value calculation unit 44 determines whether the discharge power upper limit value Wout exceeds a predetermined discharge threshold value Wout_th (S30). When the discharge power upper limit value Wout is equal to or less than the discharge threshold value Wout_th, step S32 is skipped and the process proceeds to step S18. On the other hand, when the discharge power upper limit value Wout exceeds the predetermined discharge threshold value Wout_th in step S30, the power upper limit value calculation unit 44 sets the activation prohibition flag of the activation prohibition flag setting unit 46 to 1 (valid) (S32). ). After setting the start prohibition flag, after waiting for a predetermined time (S18), the process returns to step S10 again.

As described above, when the vehicle system is shut down (Ready-Off) in a state where the open circuit voltage difference (OCV difference) is excessively widened between the battery packs 20A and 20B, the battery pack passes through the subsequent relaxation period. The voltage (CCV) between the terminals of 20A and 20B approaches the open circuit voltage. When the system of the vehicle is started in such a state, a large current may flow between the battery packs 20A and 20B based on the open circuit voltage difference. Therefore, when the open circuit voltage difference (OCV difference) between the battery packs 20A and 20B is estimated to be relatively large, that is, when the discharge power upper limit value Wout is narrowed to exceed the discharge threshold value Wout_th, the next start-up is performed. In order to prohibit the activation, the activation prohibition flag is set to 1 (valid).

Although the activation prohibition flag is set to be valid/ineffective in the charging upper limit value setting flow, for example, when the vehicle system is shut down (Ready-Off), the starting prohibition flag and the charging upper limit value setting flow in the discharging upper limit value setting flow If at least one of the start prohibition flags in 1 is set to valid (1), the next start may be prohibited.

<Charge upper limit value setting flow>
FIG. 5 illustrates a charge upper limit value setting flow according to the present embodiment. Similar to the discharge upper limit value setting flow, the start trigger of the flow is, for example, when the system of the vehicle is started (at the time of Ready-On). In addition, the continuous charging time Tc has an initial value 0.

Further, this flow is forcibly terminated when the system of the vehicle is shut down (at the time of Ready-Off). At this time, whether or not the system can be started next time is determined based on the value (0 or 1) of the start prohibition flag at the time of termination (at the time of interruption).

The continuous charging time counter 36 determines whether or not the current value I _L acquired from the current sensor 16C is less than or equal to the charging threshold value Ith_C, that is, whether the absolute value of the charging current value is greater than or equal to the absolute value of the threshold value (S40). ). Current value I _L is, exceeds the charge threshold Ith_C (stop at 0 side), then the reference charging upper limit value Win0 is set to 0 (S42). As a result, the charging power upper limit Win that is the product of the reference charging upper limit Win0 and the charging limit coefficient Kin is set to zero. Further, the continuous charging time counter 36 sets (resets) the continuous charging time Tc to 0 (S44). Further, the electric power upper limit value calculation unit 44 sets the set value of the activation prohibition flag setting unit 46 to 0 (invalid) in response to the reference charging upper limit value Win0 being 0 (S46). After waiting for a predetermined time (S48), the process returns to step S40 again.

At step S40, the current value I _L is equal to or less than the charge threshold value Ith_C, that is, when the absolute value of the charging current value is greater than or equal to the absolute value of the threshold, the count of continuous charging time by continuous charging time counter 36 Tc It is started (S50). For example, the continuous charging time Tc at step S40 is incremented.

Next, the reference upper limit value calculation unit 38 obtains the reference charge upper limit value Win0 based on the continuous charging time Tc and the reference charge upper limit value map (S52). Subsequently, the resistance calculator 40 obtains the internal resistance value r1 of the battery pack 20A from the current value of the current sensor 16A and the voltage value of the voltage sensor 18. Further, the internal resistance value r2 of the battery pack 20B is obtained from the current value of the current sensor 16B and the voltage value of the voltage sensor 18.

The restriction coefficient calculation unit 42 acquires the internal resistance value r1 of the battery pack 20A and the internal resistance value r2 of the battery pack 20B from the resistance calculation unit 40, and obtains the internal resistance difference Δr between them (S54). Further, the restriction coefficient calculation unit 42 obtains the charging restriction coefficient Kin based on the internal resistance difference Δr and the charging restriction coefficient map (S56).

The power upper limit value calculation unit 44 acquires the reference charging upper limit value Win0 from the reference upper limit value calculation unit 38, and also acquires the charging restriction coefficient Kin from the restriction coefficient calculation unit 42. Further, the power upper limit value calculation unit 44 multiplies the reference charge upper limit value Win0 by the charge restriction coefficient Kin to calculate the final charge power upper limit value Win (S58). On/off operation of the switching element (not shown) of the power control unit 14 is controlled based on the calculated charging power upper limit Win.

Further, the power upper limit value calculation unit 44 determines whether or not the charging power upper limit value Win is less than the predetermined charging threshold value Win_th, in other words, whether the absolute value of the charging power upper limit value Win exceeds the absolute value of the charging threshold value Win_th. It is determined whether or not (S60). When the charging power upper limit Win is equal to or higher than the charging threshold Win_th (Win≧Win_th, |Win|≦|Win_th|), step S62 is skipped and the process proceeds to step S48. On the other hand, when the charging power upper limit value Win is less than the predetermined charging threshold value Win_th (Win<Win_th, |Win|>|Win_th|), the power upper limit value calculation unit 44 sets the activation prohibition flag of the activation prohibition flag setting unit 46. It is set to 1 (valid) (S62). After setting the start prohibition flag, after waiting for a predetermined time (S48), the process returns to step S40.

10 power supply control device, 12 battery module, 16A, 16B, 16C current sensor, 18 voltage sensor, 20A, 20B battery pack, 34 continuous discharge time counter, 36 continuous charge time counter, 38 reference upper limit value calculation unit, 40 resistance calculation unit , 42 restriction coefficient calculation unit, 44 electric power upper limit value calculation unit, 46 start prohibition flag setting unit, MG rotating electric machine (load).

Claims (1)

An in-vehicle power supply control device for controlling charge/discharge power between a load and a battery module having a plurality of battery packs connected in parallel,
The discharge current value from the battery module to the load is a continuous discharge time that is a continuous time that is equal to or more than the discharge threshold value that is a positive current value, and the absolute value of the charge current value from the load to the battery module is negative. While measuring the continuous charging time that is the duration that is equal to or greater than the absolute value of the charging threshold that is the current value ,
When the discharge current value becomes less than the discharge threshold value, the continuous discharge time is reset to 0, and then when the discharge current value becomes equal to or more than the discharge threshold value, the measurement of the continuous discharge time is restarted,
When the absolute value of the charging current value is less than the absolute value of the charging threshold value, the continuous charging time is reset to 0, and when the absolute value of the charging current value becomes equal to or more than the absolute value of the charging threshold value, the continuous charging time period is reset. Restart measurement,
Performs measurement and reset from the time the system starts up to the time the system is shut down,
A counter,
A resistance calculation unit for calculating the internal resistance of the plurality of battery packs,
The discharge power upper limit value from the battery module to the load is reduced according to the increase of the continuous discharge time, and the reduction rate of the discharge power upper limit value according to the increase of the internal resistance difference between the battery packs. While increasing the charge, the charging power upper limit value from the load to the battery module is reduced according to the increase of the continuous charging time, and the charging power upper limit value according to the increase of the internal resistance difference between the battery packs. An upper limit calculation unit that increases the reduction rate of
An in-vehicle power supply control device comprising:

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