Battery control device and battery control method

Abstract

To provide a battery control device with small calculation load which can suppress deterioration of satisfaction of a user, regarding deterioration suppression of a secondary battery of a rechargeable cleaner, etc.SOLUTION: A battery control device 1 of the present invention comprises: a storage unit 14 which stores a target deterioration curve of a secondary battery, and a parameter table in which a deterioration rate of any deterioration factor of upper limit voltage of charge of the secondary battery, charging current, discharging current, and temperature is set for each restriction order so that the deterioration is suppressed; a deterioration prediction unit 15 which calculates capacity reduction of the secondary battery on the basis of the deterioration rate of the deterioration factor; and a deterioration suppression unit 16 which acquires a future target deterioration state from the target deterioration curve when a detected deterioration state of the secondary battery is deteriorated more than the target deterioration curve, sequentially increases the restriction order until the future deterioration state due to the capacity reduction calculated from the deterioration rate of the parameter table by the deterioration prediction unit reaches the target deterioration state, and performs deterioration suppression control of the secondary battery on the basis of the deterioration rate corresponding to the restriction order when the future deterioration state reaches the target deterioration state.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a battery control device and a battery control method. [Background technology]

[0002] 2. Description of the Related Art Devices that use secondary batteries, such as rechargeable vacuum cleaners, are sometimes equipped with a battery control device to suppress deterioration of device performance in response to cycle deterioration of the secondary battery. For example, Patent Document 1 discloses a technology relating to battery control for an electric vacuum cleaner that performs power control to reduce the current value of an electric blower so as to ensure the operating time of the vacuum cleaner even when the battery has deteriorated.

[0003] Patent Document 2 also discloses a method for increasing customer value by predicting battery life and displaying trade-off battery characteristics, such as visually indicating the extent to which suction power decreases when trying to extend battery life, on the display unit of a smartphone, etc. Patent Document 2 further discloses predicting battery life using the remaining battery capacity, temperature, and charge / discharge history. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2020-032173 [Patent Document 2] Patent Publication No. 2021-020011 Summary of the Invention [Problem to be solved by the invention]

[0005] According to Patent Document 1, by reducing the discharge current, it is possible to suppress deterioration of the secondary battery, but this reduces the suction power of the vacuum cleaner, which is a problem that reduces user satisfaction.

[0006] The deterioration of a secondary battery is based on factors such as not only the discharge current but also the charge current, the upper limit voltage, or the temperature. According to Patent Document 2, it is possible to visually grasp the extent to which suction force decreases when trying to extend the battery life, but there is no description of how and to what extent the deterioration factors can be reduced to suppress the deterioration of secondary batteries.

[0007] On the other hand, controlling secondary battery degradation while suppressing a decline in user satisfaction using a secondary battery degradation prediction formula based on multiple degradation factors, such as the upper limit voltage of secondary battery charging, charging current, discharging current, and battery temperature, requires a large computational load. For this reason, it is difficult to perform degradation suppression control in devices such as rechargeable vacuum cleaners and BMS (Battery Management Systems) for home appliances.

[0008] An object of the present invention is to provide a battery control device and a battery control method that reduce the calculation load and can suppress a decrease in user satisfaction, in relation to suppressing deterioration of a secondary battery in a rechargeable vacuum cleaner or the like. [Means for solving the problem]

[0009] In order to solve the above problem, a battery control device for a secondary battery of a rechargeable vacuum cleaner includes a memory unit that stores a target deterioration curve of the secondary battery and a parameter table in which the rate of decline of at least one of the deterioration factors of the upper limit voltage of charging, charging current, discharging current, and temperature of the secondary battery is set for each restriction rank so that deterioration is suppressed; a deterioration prediction unit that calculates a capacity decrease of the secondary battery based on the rate of decline of the deterioration factor; and a deterioration suppression unit that, when the detected deterioration state of the secondary battery is worse than the target deterioration curve, obtains a future target deterioration state from the target deterioration curve, increases the restriction rank in order until the future deterioration state due to capacity decline calculated by the deterioration prediction unit from the rate of decline in the parameter table reaches the target deterioration state, and controls deterioration suppression of the secondary battery based on the rate of decline corresponding to the restriction rank when the target deterioration state is reached. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a battery control device and a battery control method that reduce the calculation load and can prevent a decrease in user satisfaction in relation to the suppression of deterioration of a secondary battery in a rechargeable vacuum cleaner or the like. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 2 is a block diagram showing the configuration of a battery control device. [Figure 2] FIG. 10 is a flowchart illustrating the details of the function of the deterioration suppression unit. [Figure 3] FIG. 10 is a flow diagram illustrating deterioration suppression control. [Figure 4] FIG. 10 is a diagram illustrating an overview of deterioration suppression control. [Figure 5] FIG. 10 is a diagram showing the configuration of a parameter table. [Figure 6A] FIG. 10 is a diagram illustrating an example of creating a parameter table. [Figure 6B] FIG. 10 is a diagram illustrating an example of creating a parameter table. [Figure 6C] FIG. 10 is a diagram illustrating an example of creating a parameter table. [Figure 6D] FIG. 10 is a diagram illustrating an example of creating a parameter table. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 is a block diagram showing the configuration of a battery control device according to an embodiment installed in a rechargeable vacuum cleaner. The following describes the battery control device according to an embodiment installed in a rechargeable vacuum cleaner, but the battery control device also operates in the same way in other devices that are powered by a built-in secondary battery.

[0013] The battery control device 1 of the embodiment is composed of a time / storage temperature management unit 11, an SOC / SOHQ detection unit 12, an operating information collection and analysis unit 13, a memory unit 14, a deterioration prediction unit 15, a deterioration suppression unit 16, and a network communication unit 17.

[0014] Specifically, the battery control device 1 is a control device including a CPU (Central Processing Unit), ROM (Read only memory), RAM (Random access memory), electronic components, and an interface circuit, and realizes the functions of each of the above processing units by executing a program stored in the ROM. Also, the battery control device 1 may realize some of the functions of a control device for a rechargeable vacuum cleaner.

[0015] The battery control device 1 is connected to a secondary battery 3 that is the power source of the vacuum cleaner, a display unit 4 that displays the operating status of the vacuum cleaner and the charging rate of the secondary battery 3, an operation unit 5 that allows the user to specify the operating status of the vacuum cleaner, such as the suction power of the "strong," "standard," or "weak," a clock 6 that displays the date and time, a thermometer 7 that detects the temperature of the rechargeable vacuum cleaner, and a drive control unit 2 that controls the operation of the electric blower based on operation instructions from the operation unit 5 and instructs the display unit 4 to display the operating status and the charging rate of the secondary battery 3.

[0016] The time and storage temperature management unit 11 of the battery control device 1 obtains time information relating to the shipping time, storage, and use of the secondary battery 3 from the clock 6, and also obtains temperature information such as the storage temperature of the secondary battery 3 from the thermometer 7. The time and storage temperature management unit 11 stores the obtained shipping time and storage temperature in the memory unit 14, which will be described later.

[0017] The SOC / SOHQ detection unit 12 of the battery control device 1 acquires the voltage V, current I, and battery surface temperature T of the secondary battery 3, and detects the state of charge (SOC) and state of health (SOH) of the secondary battery 3 from these. As an indicator of the state of health (health), the capacity retention rate (SOHQ), which is the ratio of the capacity at a certain point in time to the initial capacity (mAh or Ah), or the rate of resistance rise (SOHR), which is the rate of increase in internal resistance from the initial state, is used. In the following explanation, the state of health (health) is indicated by the capacity retention rate (SOHQ).

[0018] The SOC / SOHQ detection unit 12 can apply known methods to detect the SOC and SOHQ, but it is preferable to use the Kalman filter method for detection, as this requires a small calculation load and allows for highly accurate detection.

[0019] The operating information collection and analysis unit 13 of the battery control device 1 acquires the voltage V, current I, and battery surface temperature T in a predetermined cycle (period) during charging and discharging of the secondary battery 3, and stores them in the memory unit 14 described later, and also stores the SOC and SOHQ detected by the SOC / SOHQ detection unit 12 in the memory unit 14.

[0020] The memory unit 14 of the battery control device 1 stores the detected values ​​of SOC and SOHQ, the history of battery usage conditions, and user usage trends, as well as shipping time, storage temperature, and target deterioration curve data. Furthermore, the memory unit 14 stores a parameter table that lists, for each restriction rank, values ​​of battery parameters (deterioration factors) such as the upper limit voltage for charging, charging current, discharging current, and battery temperature corresponding to the degree of deterioration of the secondary battery 3. The parameter table will be described in detail later.

[0021] The target deterioration curve data indicates, for example, the value of SOHQ relative to the number of charge / discharge cycles of the secondary battery 3. The target deterioration curve data can be set arbitrarily by the user or manufacturer.

[0022] The deterioration prediction unit 15 of the battery control device 1 is a processing unit that predicts the capacity reduction of the secondary battery 3 from the start of use based on battery parameters (deterioration factors) such as the upper limit voltage of charging, charging current, discharging current, and battery storage temperature.

[0023] The deterioration suppression unit 16 of the battery control device 1 compares the detected SOHQ with the value of the target deterioration curve to select whether or not to perform deterioration suppression operation for the secondary battery 3 when charging or discharging the rechargeable vacuum cleaner, and instructs the drive control unit 2 to adjust the charging current or control the drive of the electric blower according to the selection result. Details of the deterioration suppression unit 16 will be described later.

[0024] The network communication unit 17 of the battery control device 1 is a communication unit through which the deterioration suppression unit 16 notifies a network terminal such as a smartphone connected to the Internet of the degree of deterioration of the secondary battery 3 and acquires the user's preferences, such as whether or not deterioration suppression of the secondary battery 3 is required.

[0025] The deterioration prevention unit 16 displays the degree of deterioration of the secondary battery 3 on the display unit 4 and can obtain information on the need for deterioration prevention of the secondary battery 3 using the operation unit 5. By linking with a smartphone via the network communication unit 17, the degree of deterioration of the secondary battery 3 can be displayed in detail, improving the usability of the rechargeable vacuum cleaner.

[0026] Next, the details of the deterioration determination process of the deterioration suppression unit 16 will be described with reference to the flowchart of FIG.

[0027] In step S21, the deterioration suppression unit 16 determines whether a predetermined cycle time has elapsed. If the predetermined cycle time has not elapsed (No in S21), the process ends, and if the predetermined cycle time has elapsed (Yes in S21), the process proceeds to step S22.

[0028] In step S22, the deterioration suppression unit 16 extracts the current SOHQ detection value of the secondary battery 3 from the storage unit .

[0029] In step S23, the deterioration suppression unit 16 retrieves from the storage unit 14 the SOHQ target value corresponding to the current number of charge / discharge cycles of the secondary battery 3 by referring to the target deterioration curve.

[0030] In step S24, the degradation suppression unit 16 compares the SOHQ to see if the detected SOHQ value is greater than the target SOHQ value, and if it is greater (Yes in S24), the process proceeds to step S25, and if it is not greater (No in S24), the process proceeds to step S26. That is, in step S24, the degradation state of the secondary battery 3 is determined, and it is determined whether degradation suppression of the secondary battery 3 is necessary.

[0031] In step S25, because the degradation state of the secondary battery 3 is better than the target state, the degradation suppression unit 16 determines that degradation suppression control of the secondary battery 3 in the current cycle is unnecessary and either does not issue an instruction to the drive control unit 2 or instructs the drive control unit 2 not to change the drive conditions. Then, the process ends. As a result, the rechargeable vacuum cleaner does not perform degradation suppression control of the secondary battery 3 in the current cycle and continues operating until the next cycle.

[0032] In step S26, the deterioration suppression unit 16 determines whether or not deterioration suppression control of the secondary battery 3 is desired, and if it is desired (Yes in S26), proceeds to step S27, and if it is not desired (No in S26), proceeds to step S28.

[0033] Some users of rechargeable vacuum cleaners desire deterioration suppression control in order to extend the life of the secondary battery 3, while others prioritize performance without worrying too much about the life of the secondary battery 3 and are happy to replace the secondary battery 3. By providing step S26 in the battery control device 1 of the embodiment, it is possible to obtain the effect of increasing the satisfaction of the user of the rechargeable vacuum cleaner.

[0034] Whether or not the deterioration suppression control of the secondary battery 3 is desired in step S26 is stored by the user in the memory unit 14 as an operating condition using the display unit 4 and the operation unit 5. Alternatively, whether or not the deterioration suppression control of the secondary battery 3 is desired may be set from the user's smartphone via the network communication unit 17, and may be stored in the memory unit 14 as an operating condition of the rechargeable vacuum cleaner.

[0035] Also, in step S26, the deterioration prevention unit 16 may display an alarm of early deterioration of the secondary battery 3 on the display unit 4, input whether or not the user desires deterioration prevention control from the operation unit 5, and make a judgment based on whether or not the user desires the control. Also, in step S26, the degradation prevention unit 16 may display an alert of early deterioration of the secondary battery 3 on the user's smartphone via the network communication unit 17, and may input whether or not the user desires degradation prevention control from the smartphone, and make a judgment based on whether or not the user desires the control.

[0036] In step S27, the deterioration suppression unit 16 instructs the drive control unit 2 to perform deterioration suppression control of the secondary battery 3 so that the deterioration state of the secondary battery 3 reaches the target value, and then ends the process. As a result, the rechargeable vacuum cleaner performs deterioration suppression operation in the current cycle. Details of the deterioration suppression control will be described later.

[0037] If the deterioration suppression unit 16 detects that the SOHQ detection value is greater than the SOHQ target value during the transition cycle of the cycle in which deterioration suppression control of the secondary battery 3 has been performed, the deterioration suppression unit 16 may display on the display unit 4 that the early deterioration of the secondary battery 3 has been resolved.

[0038] In step S28, the deterioration suppression unit 16 determines that deterioration suppression control of the secondary battery 3 is not necessary in the current cycle and either does not issue an instruction to the drive control unit 2 or instructs the drive control unit 2 not to change the drive conditions. Then, the process proceeds to step S29. As a result, the rechargeable vacuum cleaner does not perform deterioration suppression control of the secondary battery 3 in the current cycle and continues operating until the next cycle.

[0039] In step S29, the degradation suppression unit 16 does not perform degradation suppression control, and instead displays a warning of early deterioration of the secondary battery 3 on the display unit 4. This notifies the user of the need for battery replacement and urges them to prepare a replacement secondary battery 3. The warning of early deterioration of the secondary battery 3 may be displayed on the user's smartphone via the network communication unit 17.

[0040] As described above, the deterioration suppression unit 16 determines whether or not deterioration suppression control is performed by comparing it in advance with the target deterioration curve in the memory unit, so the battery control device of the embodiment can be applied even to home appliances such as rechargeable vacuum cleaners that have low calculation performance.

[0041] Next, the deterioration suppression control of the secondary battery 3 in step S27 of FIG. 2 will be described in detail with reference to FIGS.

[0042] First, an overview of the deterioration suppression control will be explained with reference to FIG. FIG. 4 shows the relationship between the target deterioration curve and the detected SOHQ value with respect to the change in the number of cycles, with the horizontal axis representing the number of cycles and the vertical axis representing the SOHQ.

[0043] In the past (first cycle), the SOHQ detection value met the target deterioration curve, but It is assumed that the secondary battery 3 is charged and discharged under predetermined conditions, and that at the present time (10th cycle), the detected SOHQ value is below the target deterioration curve.

[0044] The battery control device 1 of the embodiment performs deterioration suppression control of the charge and discharge of the secondary battery 3 under operating conditions that result in less capacity loss per cycle than at present, so that the SOHQ detection value will satisfy the target deterioration curve in the future (20th cycle).

[0045] SOHQ is expressed by formula (1) where ΔQ is the capacity loss %. SOHQ(%)=100-ΔQ(%) (1) ΔQ is expressed by equation (2) where Vmax is the upper limit voltage of charging, Icha is the charging current, Idis is the discharging current, and T is the storage temperature. ΔQ=f(Vmax, Icha, Idis, T) ···(2)

[0046] Furthermore, when the storage temperature of the secondary battery 3 is assumed to be a factor in the capacity reduction, the contribution of storage deterioration is added to the parameters of equation (2).

[0047] In the battery control device 1 of the embodiment, the deterioration predicting unit 15 refers to the parameter table in the storage unit 14 and calculates the capacity decrease ΔQ using equation (2). In this case, various types of deterioration prediction formula (2) have already been devised, and any method can be used as long as it satisfies the prediction accuracy.

[0048] Next, the process flow of the deterioration suppression control of the secondary battery 3 performed by the deterioration suppression unit 16 in step S27 of FIG. 2 will be described with reference to FIG.

[0049] In step S31, the deterioration suppression unit 16 sets the SOHQ of the next determination cycle (future) of the target deterioration curve in the storage unit 14 as the target SOHQ.

[0050] In step S32, the deterioration suppression unit 16 sets the restriction priority in the parameter table of the storage unit 14, the details of which will be described later.

[0051] In step S33, the deterioration suppressing unit 16 predicts the capacity decrease ΔQ by the deterioration predicting unit 15 using the deterioration suppression factor corresponding to the restriction rank in the parameter table as a parameter, and calculates the future SOHQ by equation (1).

[0052] In step S34, the deterioration suppression unit 16 determines whether the future SOHQ calculated in step S33 has reached the target SOHQ calculated in step S31. That is, if the future SOHQ is equal to or greater than the target SOHQ, it is determined that the target SOHQ has been reached (Yes in S34), and the process proceeds to step S35. If the future SOHQ is less than the target SOHQ, it is determined that the target SOHQ has not been reached (Yes in S34), and the process returns to step S32.

[0053] In step S32, the deterioration suppression unit 16 updates the restriction rank by raising the restriction rank by one to suppress deterioration, calculates the future SOHQ in step S33, and determines whether the future SOHQ has reached the target SOHQ in step S34. The deterioration suppression unit 16 then repeats this process until the future SOHQ reaches the target SOHQ.

[0054] In step S35, the drive control unit 2 is instructed to perform degradation suppression control with suppressed parameters that will bring the degradation state of the secondary battery 3 to a target value until the predetermined cycle, and suppression control operation is started, and the process ends.

[0055] As described above, the battery control device 1 of the embodiment predicts deterioration using a parameter table that shows the values ​​of battery parameters (deterioration factors) such as the upper limit voltage of charging, charging current, discharging current, battery temperature, etc. for each restriction rank, and controls the suppression of deterioration of the secondary battery 3.

[0056] For this reason, it is important to determine the priority and the degree to which the deterioration factors should be reduced when creating a parameter table. For example, if only the discharge current is suppressed as one deterioration factor to determine the future deterioration level, a decrease in the discharge current will significantly reduce the suction force, resulting in a significant decrease in customer satisfaction.

[0057] Therefore, in the battery control device 1 of the embodiment, a parameter table is created that shows the restriction order, deterioration factors, and their restriction ratios, and the deterioration factors are reduced in a balanced manner so as not to reduce customer satisfaction.

[0058] Regarding deterioration factors, if there is no cooling mechanism for temperature, a parameter table is created using three deterioration factors: charge current, discharge current, and upper limit voltage. If there is a cooling mechanism, a parameter table may be created using four deterioration factors, including temperature in addition to the deterioration factor. The parameter table is created to include at least one of the deterioration factors: charge current, discharge current, upper limit voltage for charging, and temperature.

[0059] Next, a method for creating a parameter table will be described. Here, a case will be described in which a parameter table is created using three deterioration factors: charging current, discharging current, and upper limit charging voltage.

[0060] FIG. 5 is a diagram showing the configuration of the parameter table. The parameter table is composed of the rate of decline of three deterioration factors, parameter A (discharge current), parameter B (upper limit voltage for charging), and parameter C (charging current), for each of 15 levels of restriction ranking.

[0061] The parameter table may be a fixed parameter table in which the deterioration factors of discharge current, upper limit charging voltage, and charging current are assigned to parameters A, B, and C from the beginning, and the deterioration rate of each deterioration factor is input to parameters A, B, and C. Alternatively, the parameter table may be dynamically created according to the operating conditions of the rechargeable vacuum cleaner, such as prioritizing suction performance, operating time, short charging time, or battery life.

[0062] An example of dynamic creation when the deterioration factors are three factors, namely, charge current, discharge current, and upper limit voltage of charge, will be described with reference to FIGS. 6A to 6D.

[0063] First, as shown in Figure 6A, the suppression rate for each of the three deterioration factors, i.e., charge current, discharge current, and upper limit voltage of charge, is determined. Specifically, the suppression rate increases as the restriction rank increases so that deterioration is suppressed.

[0064] Next, as shown in FIG. 6B, the discharging current is assigned to parameter A in the parameter table of FIG. 5, the upper limit voltage for charging is assigned to parameter B, and the charging current is assigned to parameter C.

[0065] Then, as shown in FIG. 6C, upper limits of the reduction rates (reduction %) of the parameters A, B, and C are determined.

[0066] Finally, as shown in FIG. 6D, the values ​​of the reduction rates (reduction %) for the parameters A, B, and C for each restriction rank are determined. In this case, the reduction rate is assigned based on the priority given to the operating conditions of the rechargeable vacuum cleaner, such as suction performance, operating time, short charging time, or battery life. In Figure 6D, the reduction rate is determined in the order of parameter A with the highest priority, parameter B, and parameter C.

[0067] Specifically, since the discharge current is assigned to parameter A in Fig. 6B, the value of the discharge current reduction rate in Fig. 6A is entered into parameter A. In this case, since the upper limit of the discharge current reduction rate is set to 3% in Fig. 6C, the value of the discharge current reduction rate is set to 3% when the restriction rank is 3 or higher, as shown in Fig. 6D.

[0068] Next, for parameter B, which is assigned the upper limit voltage of charging, the value of the decrease rate of the upper limit voltage of charging in Fig. 6A is entered from restriction rank 3, where the decrease rate of the discharge current of parameter A has reached its upper limit, as shown in Fig. 6D. In this case, since the upper limit value of the decrease rate of the upper limit voltage of charging is set to 3% in Fig. 6C, the value of the decrease rate of the upper limit voltage of charging is set to 3% for restriction ranks 6 and above, as shown in Fig. 6D.

[0069] For parameter C to which the charging current is assigned, as shown in FIG. 6D, the value of the rate of decrease in the charging current in FIG. 6A is entered starting from the limit rank 6, which is the upper limit of the rate of decrease in the upper limit voltage of charging for parameter B.

[0070] When calculating future SOHQ using the deterioration prediction formula, the deterioration suppression unit 16 raises the restriction order in the table of Fig. 6D and inputs the suppression rate of each parameter set to that restriction order into the deterioration prediction unit 15 for calculation. Since it is only necessary to raise the order in the parameter table during calculation, the calculation load can be reduced. In addition, the reduction rate of each deterioration factor can be set in a balanced manner, which has the effect of increasing customer satisfaction.

[0071] The battery control device of the embodiment can display the deterioration factors to be suppressed and controlled on the rechargeable vacuum cleaner body (display unit 4) or on a network terminal such as a smartphone that communicates with the network communication unit 17 via a server. This allows the user of the rechargeable vacuum cleaner to know which deterioration factors are currently being suppressed and controlled. In this case, the deterioration factors can be displayed as reduced suction power, shorter operating time, longer charging time, etc., making it easier for the user to recognize the disadvantages.

[0072] In addition, the battery control device of the embodiment may set operating conditions such as prioritizing suction performance, prioritizing operating time, prioritizing short charging time, or prioritizing battery life from a network terminal such as a user's smartphone connected to the operation unit 5 or the network communication unit 17, and based on this, set the priority of deterioration factors (parameters) and create a parameter table.

[0073] Furthermore, in the battery control device of the embodiment, the parameter table may be created by a server on a network connected to the network communication unit 17, and the created parameter table may be stored in the storage unit 14. In this case, the server may create the parameter table based on operating conditions such as prioritizing suction performance, prioritizing operating time, prioritizing short charging time, or prioritizing battery life, which are set from a network terminal such as a smartphone of a user of a rechargeable vacuum cleaner connected to the server's network.

[0074] In addition, a server connected to the network communication unit 17 via a network may be provided with a parameter table and a deterioration prediction function similar to that of the deterioration prediction unit 15, and the battery control device 1 may perform deterioration suppression control of the secondary battery 3 based on the deterioration prediction (capacity reduction ΔQ) obtained by the server.

[0075] The present invention is not limited to the above-described embodiments, and other forms that can be conceived within the scope of the technical idea of ​​the present invention are also included within the scope of the present invention as long as they do not impair the characteristics of the present invention. The above-described examples have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to those having all of the described configurations. [Explanation of symbols]

[0076] 1 Battery control device 11 Time / Storage Temperature Control Department 12 SOC / SOHQ detector 13 Driving Information Collection and Analysis Department 14 Storage section 15 Deterioration prediction section 16 Deterioration suppression part 17 Network Communications Department 2 Drive control unit 3 Secondary battery 4 Display 5 Control section 6. Clock 7 Thermometer

Claims

1. A battery control device for a secondary battery of a rechargeable vacuum cleaner, a storage unit that stores a target deterioration curve of the secondary battery and a parameter table that sets a rate of decrease in at least one of a maximum voltage, a charging current, a discharging current, and a temperature of the secondary battery for each restriction rank so as to suppress deterioration; a deterioration prediction unit that calculates a capacity decrease of the secondary battery based on a rate of decrease of the deterioration factor; a degradation suppression unit that, when the detected degradation state of the secondary battery is deteriorated below a target degradation curve, acquires a future target degradation state from the target degradation curve, increases the restriction rank in order until the future degradation state due to capacity reduction calculated by the degradation prediction unit from the degradation rate in the parameter table reaches the target degradation state, and controls degradation suppression of the secondary battery based on the degradation rate corresponding to the restriction rank when the target degradation state is reached; A battery control device comprising:

2. 2. The battery control device according to claim 1, When the detected deterioration state of the secondary battery is deteriorated below a target deterioration curve, the deterioration suppression unit performs deterioration suppression control of the secondary battery depending on whether or not a user of the rechargeable vacuum cleaner desires to suppress deterioration of the secondary battery. A battery control device characterized by:

3. 2. The battery control device according to claim 1, a display unit that displays operation conditions such as suction performance priority, operation time priority, short charge time priority, or battery life priority; an operation unit for selecting one of the operating conditions, The parameter table has different reduction rates of the deterioration factors set for each restriction rank according to the operating conditions selected by the operation unit. A battery control device characterized by:

4. 4. The battery control device according to claim 3, The parameter table sets the priority of the deterioration factors in accordance with the operating conditions selected by the operation unit, and changes the limit order at which the increase in the rate of decrease for each deterioration factor starts. A battery control device characterized by:

5. 2. The battery control device according to claim 1, a network communication unit that connects to a mobile terminal of a user of the rechargeable vacuum cleaner or a server; The parameter table created by the mobile terminal or the server is acquired via the network communication unit. A battery control device characterized by:

6. 2. The battery control device according to claim 1, a network communication unit that connects to a mobile terminal of a user of the rechargeable vacuum cleaner or to a server; The deterioration prediction unit acquires the capacity decrease of the secondary battery calculated by the mobile terminal or the server via the network communication unit. A battery control device characterized by:

7. 2. The battery control device according to claim 1, Further, a display unit is provided for displaying a deterioration state of the secondary battery, The deterioration suppression unit When the detected deterioration state of the secondary battery is deteriorated below a target deterioration curve, an alarm of early deterioration is displayed on the display unit; When the deterioration state of the secondary battery detected after the deterioration suppression control of the secondary battery is not deteriorated below a target deterioration curve, the display unit displays "early elimination of deterioration." A battery control device characterized by:

8. A battery control method for a secondary battery of a rechargeable vacuum cleaner, comprising: detecting a current capacity maintenance rate of the secondary battery as a detected deterioration value; determining a capacity retention rate corresponding to a current number of charge / discharge cycles as a target deterioration value from a target deterioration curve of the capacity retention rate of the secondary battery; when the detected deterioration value is not greater than the target deterioration value, acquiring a target capacity maintenance rate corresponding to a future number of charge / discharge cycles from the target deterioration curve, increasing the restriction rank in order until a future capacity maintenance rate due to capacity reduction calculated from a parameter table set for each restriction rank so as to suppress deterioration of at least one of a deterioration factor of an upper limit voltage of charging, a charging current, a discharging current, and a temperature of the secondary battery reaches the target capacity maintenance rate, and controlling deterioration suppression of the secondary battery based on the decrease rate corresponding to the restriction rank when the target capacity maintenance rate is reached; A battery control method comprising:

9. 9. The battery control method according to claim 8, When the detected deterioration value is not greater than the target deterioration value, determining whether or not deterioration suppression control of the secondary battery is desired, and when the desired deterioration suppression control is not desired, displaying a warning of early deterioration without performing deterioration suppression control of the secondary battery. A battery control method comprising:

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