Battery management device and battery control method

Abstract

The present invention aims to prevent lithium deposition by separately estimating the negative electrode voltage in addition to the terminal voltage of the battery cell through parameters related to a negative electrode voltage estimation model, and to set an appropriate output value for charging power through continuous monitoring of the negative electrode voltage value, thereby preventing lithium deposition and flexibly managing the charging power. [Solution] A battery control method is disclosed, which includes the steps of: obtaining at least one of the voltage, current, and temperature values ​​of a battery cell from one or more sensors; calculating the charge state of the battery cell based on at least one of the voltage, current, and temperature values; estimating the negative electrode voltage value based on the charge state of the battery cell, at least one of the voltage, current, and temperature values; and determining the target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

Description

Technical Field

[0001] The present disclosure relates to a battery control method and a battery management device for performing the same.

Background Art

[0002] When using a lithium-ion battery, there was a problem that a fire occurred due to lithium precipitation (dendrite) when the negative electrode voltage of the battery reached a specific region. To prevent this, as a conventional technique for controlling the output power of a battery, based on the current state of the current battery (Sox), the battery current, the battery temperature, and the battery voltage, the output command value was mainly determined so that the terminal voltage value of the battery could be positioned within the range between the overvoltage reference value and the low voltage reference value. Furthermore, research has been underway on a battery control method that can be applied flexibly not only in the situation where the battery is charged in a plugged-in state but also in various operating situations.

Summary of the Invention

Problems to be Solved by the Invention

[0003] According to an embodiment of the present disclosure, it is a technical problem to prevent the lithium precipitation phenomenon by separately estimating not only the terminal voltage of the battery cell but also the negative electrode voltage through parameters related to the negative electrode voltage estimation model.

[0004] According to an embodiment of the present disclosure, it is a technical problem to set an appropriate output value of charging power through continuous monitoring of the negative electrode voltage value, prevent the lithium precipitation phenomenon, and manage the charging power flexibly.

Means for Solving the Problems

[0005] A battery control method performed by a battery management device according to one embodiment may include the steps of: obtaining at least one of the voltage value, current value, and temperature value of a battery cell from one or more sensors; calculating the charge state of the battery cell based on at least one of the voltage value, current value, and temperature value; estimating the negative electrode voltage value based on the charge state of the battery cell and at least one of the voltage value, current value, and temperature value; and determining the target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

[0006] The determination step may include a step of deciding to reduce the target output value to approximately the first control unit value if the negative electrode voltage value is less than the first reference value.

[0007] The first control unit value can be determined to be larger as the difference between the negative electrode voltage value and the first reference value increases.

[0008] At least one of the first reference value and the first control unit value may be determined based on user input.

[0009] The determination step may include a step in which, if the negative electrode voltage value exceeds the second reference value, the target output value is increased to approximately the second control unit value.

[0010] The second control unit value can be determined to be larger as the difference between the negative electrode voltage value and the second reference value increases.

[0011] At least one of the second reference value and the second control unit value may be determined based on user input.

[0012] A battery control method according to one embodiment may further include a step of determining the target output value to be the same as the reference output value if the target output value exceeds the reference output value.

[0013] The reference output value may be obtained based on the voltage value, current value, temperature value, and charge state of the battery cell.

[0014] A battery management device that performs a battery control method according to one embodiment includes one or more sensors that acquire at least one of the voltage value, current value, and temperature value of a battery cell; a memory that stores instruction words; and a processor connected to the memory, wherein the processor acquires at least one of the voltage value, current value, and temperature value of a battery cell from the one or more sensors, calculates the charge state of the battery cell based on at least one of the voltage value, current value, and temperature value, estimates the negative electrode voltage value based on the charge state of the battery cell, at least one of the voltage value, current value, and temperature value, and can determine the target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

[0015] Specific details of other embodiments are included in the detailed description and drawings. [Effects of the Invention]

[0016] According to one embodiment of the present disclosure, lithium deposition can be prevented by separately estimating the negative electrode voltage in addition to the terminal voltage of the battery cell through parameters related to the negative electrode voltage estimation model.

[0017] According to one embodiment of the present disclosure, an appropriate charging power output value can be set through continuous monitoring of the negative electrode voltage value, thereby preventing lithium deposition and allowing for fluid management of the charging power. [Brief explanation of the drawing]

[0018] [Figure 1] This is a diagram illustrating the configuration of a system that performs a battery control method according to one embodiment. [Figure 2a] This is a drawing for explaining the general concept of a battery control method according to an embodiment. [Figure 2b] This is a drawing for explaining the general concept of a battery control method according to an embodiment. [Figure 3] This is a drawing for explaining the process of estimating the negative electrode voltage value in a battery control method according to an embodiment. [Figure 4] This is a flowchart for explaining a battery control method according to an embodiment. [Figure 5] This is a drawing for explaining an output control method related to the range of the negative electrode voltage value in a battery control method according to an embodiment. [Figure 6] This is a flowchart for explaining the battery output control stage in a battery control method according to an embodiment. [Figure 7] This is a block diagram of a battery management device according to an embodiment.

MODE FOR CARRYING OUT THE INVENTION

[0019] In the embodiments, the terms used are, as much as possible, general terms that are currently widely used while considering the functions in the present disclosure. However, this can change depending on the intentions or precedents of those skilled in the art, the emergence of new technologies, etc. Also, in certain cases, there are terms arbitrarily selected by the applicant, and in such cases, the meaning will be described in detail in the corresponding explanatory part. Therefore, the terms used in the present disclosure should not be mere names of simple terms, but should be defined based on the meaning of the terms and the overall content of the present disclosure.

[0020] Throughout the specification, when a certain part states that a certain component "includes", this means that, unless otherwise stated to the contrary, it does not exclude other components and may further include other components.

[0021] The expression "at least one of a, b, and c" described throughout the specification can include "a alone", "b alone", "c alone", "a and b", "a and c", "b and c", or "all of a, b, and c".

[0022] The "device" mentioned below can be embodied by a computer or a portable device that can be connected to a server or other devices through a network. Here, the computer can include, for example, a notebook computer equipped with a web browser, a desktop, a laptop, etc., and the portable device can include, for example, as a wireless communication device that guarantees portability and mobility, all types of handheld-based wireless communication devices such as communication infrastructure devices like IMT (International Mobile Telecommunication), CDMA (Code Division Multiple Access), W-CDMA (W-Code Division Multiple Access), LTE (Long Term Evolution), smartphones, tablet PCs, etc.

[0023] Hereinafter, with reference to the accompanying drawings, the present disclosure will be described in detail so that a person having ordinary knowledge in the technical field to which the present disclosure belongs can easily implement the embodiments of the present disclosure. However, the present disclosure can be embodied in a plurality of different forms and is not limited to the embodiments described herein.

[0024] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings.

[0025] FIG. 1 is a drawing for explaining the configuration of a system that performs a battery control method according to an embodiment.

[0026] During the operation of lithium-ion batteries, a dendrite phenomenon may occur during the charging process, in which lithium crystals are deposited on the surface of the negative electrode. The dendrite phenomenon is a major cause of reduced lifespan and safety in lithium-ion batteries. In particular, when dendrites begin to form on the electrode surface inside the battery, the movement of lithium ions between the positive and negative electrodes becomes less smooth, which can lead to a decrease in the battery's energy efficiency and a reduction in battery life. Furthermore, if the dendrites continue to grow and increase in size, the separator membrane that prevents the positive and negative electrodes from touching each other may be damaged. If the separator membrane is damaged, the positive and negative electrodes will come into direct contact, and a short circuit inside the battery may occur, potentially causing a fire. For this reason, various studies are underway to properly manage the battery voltage and prevent the occurrence of the dendrite phenomenon.

[0027] Referring to Figure 1, the system 10 that performs the battery control method can operate in conjunction with a battery management device 100 that manages the battery cells 200. In this case, the battery cells 200 may be the battery cells that are subject to control by the battery management device 100 to prevent lithium deposition. On the other hand, only the components relating to this embodiment are shown in Figure 1. Therefore, a person with ordinary skill in the art relating to this embodiment can understand that in addition to the components shown in Figure 1, other general-purpose components may be included.

[0028] The battery management device 100 may include one or more sensors for measuring parameters such as current, voltage, and temperature of the aforementioned battery cells 200, and may include memory and a processor (not shown) for diverse operations. That is, such a battery management device 100 operates based on memory and a processor, but can additionally include sensors to measure and calculate the parameters of the battery cells 200. According to one embodiment, the battery management device 100 can measure the parameters of the battery cells 200 by applying an external AC power source, i.e., AC voltage or AC current, to the battery cells 200 at various frequencies and measuring the current or voltage that flows as a result.

[0029] Figures 2a and 2b are diagrams illustrating the general concept of a battery control method according to one embodiment.

[0030] Referring to Figure 2a, we can see the conventional battery control method. Conventional battery control methods mainly involved obtaining state information of the battery cell by measuring voltage, current, and temperature from the battery cell 200-1, estimating the State of Charge (SoC) of the battery cell 210 based on this, and then performing charge output control 220 to control the terminal voltage, which is the sum of the positive and negative electrode voltages of the battery cell, in order to prevent lithium deposition, based on the voltage, current, temperature, and SoC of the relevant battery cell.

[0031] In this case, lithium deposition could be prevented by maintaining the cell terminal voltage in a range that does not exceed the overvoltage criterion (e.g., approximately 4.2V) and does not fall below the undervoltage criterion (e.g., approximately 2.5V) through the terminal voltage board output control 220, using a charge map based on data acquired during plug-in charging of the battery cell. However, lithium deposition can occur not only during plug-in charging of the battery cell but also during regenerative charging of the battery cell while driving, but there were no clear separate measures to prevent lithium deposition in these situations.

[0032] Referring to Figure 2b, a battery control method according to one embodiment can be seen.

[0033] In one embodiment, the battery management device 100 measures voltage, current, and temperature from the battery cell as described in Figure 2a above to acquire battery cell state information 200-1, perform SoC estimation 210, and charge output control 220 to control the terminal voltage. In addition, it can perform negative electrode voltage estimation 230 based on at least one of the charge state, voltage value, current value, and temperature value of the battery cell 200. Since the negative electrode voltage cannot be directly measured in a typical battery cell, for example, the battery management device 100 can estimate the negative electrode voltage using a appropriately modeled negative electrode voltage model of the battery cell. The specific process by which the battery management device 100 performs negative electrode voltage estimation 230 will be examined in Figure 3 below.

[0034] Furthermore, the battery management device 100 can additionally perform negative electrode voltage-based output control 240, which determines the target output value of the battery cell 200 based on a reference output value based on the terminal voltage obtained through output control 220 and a negative electrode voltage value estimated through negative electrode voltage estimation 230. That is, by performing negative electrode voltage-based output control 240 in series after output control 240 which performs terminal voltage control, the battery management device 100 can appropriately control the negative electrode voltage so that the estimated negative electrode voltage does not enter a region where, for example, the negative electrode voltage value falls below 0V. In one embodiment, the battery management device 100 can prevent lithium deposition that may occur in the battery cell during regenerative charging through negative electrode voltage estimation 230 and negative electrode voltage-based output control 240, which will be discussed in detail below.

[0035] Figure 3 is a diagram illustrating the process of estimating the negative electrode voltage value in a battery control method according to one embodiment.

[0036] Referring to Figure 3, the structure of an anode model 230-1 that can be used by a battery management device according to one embodiment to estimate the anode voltage value can be seen. The anode model 230-1 may include, for example, a negative electrode 231 and a negative electrode separator membrane 231-1 covering the negative electrode 231, a positive electrode 232 and a positive electrode separator membrane 232-1 covering the positive electrode 232, and a reference electrode 233 located between the negative electrode separator membrane 231-1 and the positive electrode separator membrane, as shown in Figure 3.

[0037] The battery management device 100 can estimate the negative electrode voltage value based on at least one of the battery cell's charge state, voltage value, current value, and temperature value. For example, to estimate the negative electrode voltage value 256 from the negative electrode voltage model 230-1, the battery management device 100 can use a modeled circuit 250 as shown in Figure 3, and obtain several parameters through voltage response data output when various current pulses are input to the circuit, and estimate the negative electrode voltage value based on these parameters. For example, after obtaining the open-circuit voltage 252 after the application of current 251, the battery management device 100 can obtain several parameters including the negative electrode ohm resistance Ro 253, the negative electrode internal resistance Rp 254, and the negative electrode internal capacitance Cp 255. In this case, for example, the negative electrode internal resistance Rp 254 can be obtained considering the charge state of the battery cell, and the battery management device 100 can estimate the negative electrode voltage value 256 based on these parameters. In this case, the negative electrode voltage value 256 may mean the voltage of the negative electrode terminal measured with the reference electrode 233 as the ground reference. The modeled circuit 250 may be, for example, an ECM (electric circuit model) base circuit that is computationally lightweight for weight reduction purposes, but is not limited to the specific cases mentioned in the embodiments of this disclosure. For example, the battery management device 100 can acquire the negative electrode terminal voltage such that the error between the actual negative electrode cell voltage and the terminal voltage obtained through the negative electrode ECM base circuit is extremely small (e.g., within an error range of approximately RMSE 10-17 Mv, with a maximum error within the level of 27-42 mV).

[0038] Figure 4 is a flowchart illustrating a battery control method according to one embodiment.

[0039] Referring to Figure 4, in one embodiment, the battery management device 100 can obtain at least one of the following from one or more sensors: voltage, current, and temperature of a battery cell in step 410. The voltage of the battery cell may be obtained by sensing it through a voltage sensor and converting it into an electrical signal. The current of the battery cell may be obtained by sensing the change in the magnetic field generated while current flows through a current sensor. The temperature of the battery cell may be obtained by a temperature sensor that is attached to the surface or inside of the battery and measures the temperature of the battery.

[0040] In one embodiment, the battery management device 100 can calculate the charge state of the battery cell in step 420 based on at least one of the voltage value, current value, and temperature value. The State of Charge (SoC), which is the charge state of the battery cell, can be calculated using a predefined voltage value and charge state characteristics. The SoC can be calculated by considering the amount of charge or discharge over time through current integration.

[0041] In one embodiment, the battery management device 100 can estimate the negative electrode voltage value in step 430 based on at least one of the battery cell charge state, voltage value, current value, and temperature value. The battery management device 100 can estimate the negative electrode voltage value through a negative electrode voltage model and ECM base circuit as examined in Figure 3.

[0042] In one embodiment, the battery management device 100 can determine the target output value of the battery cell in step 440 based on the estimated negative electrode voltage value and the reference output value of the battery cell. The battery management device 100 can flexibly change the target output value of the battery cell, taking into account the reference output value, so that the negative electrode voltage value does not enter the region where lithium deposition is possible.

[0043] Figure 5 is a diagram illustrating an output control method relating to the range of negative electrode voltage values ​​in a battery control method according to one embodiment.

[0044] A battery management device according to one embodiment can check the negative electrode voltage state of a battery and perform appropriate battery output control based on the negative electrode voltage value of the battery, the lithium deposition value 501, a first reference value 503 which is a criterion for determining that there is a risk of lithium deposition due to a decrease in the negative electrode voltage of the battery, and a second reference value 505 which is a criterion for determining that the negative electrode voltage value of the battery is safe from the risk of lithium deposition or an overcharge criterion. Here, the first reference value 503 may be greater than the lithium deposition value 501, the second reference value 505 may be greater than the first reference value 503, and both the first reference value 503 and the second reference value 505 may be dynamically determined by user input.

[0045] Here, the lithium deposition value 501 can vary depending on the battery's operating conditions, but generally it can represent the negative electrode potential value at which lithium deposition occurs and the dendrite phenomenon begins, and for example, it may correspond to approximately 0V.

[0046] Here, the first reference value 503 may correspond to a reference value used by the battery management device 100 to determine that control is needed to further increase the negative electrode voltage value of the battery when the negative electrode voltage value of the battery approaches the lithium deposition value 501 during battery operation, and can be set to, for example, approximately 0.1V. For example, if the negative electrode voltage value is less than the first reference value 503 and exceeds the lithium deposition value 501, such as the first negative electrode voltage value 502, the battery management device 100 can change the target output value to change the target output value so that the first negative electrode voltage value 502 exceeds the first reference value 503 and has a second negative electrode voltage value 504 that is in the range of less than the second reference value 505.

[0047] Here, the second reference value 505 may correspond to a reference value for which the battery management device 100 determines that the negative electrode voltage value of the battery is sufficiently far from the lithium deposition value 501 during battery operation and that it may increase the output subject to control. For example, it may be set to approximately 0.2V. For example, if the negative electrode voltage value exceeds the second reference value 505, such as the third negative electrode voltage value 506, the battery management device 100 can determine that the negative electrode voltage value is sufficiently large compared to the lithium deposition value 501 even if the charging output used for charging increases and the negative electrode voltage value decreases slightly, and can perform control to change the target output value.

[0048] Figure 6 is a flowchart illustrating the battery output control steps in a battery control method according to one embodiment.

[0049] Referring to Figure 6, in one embodiment, the battery management device 100 can determine a target output value as a reference output value in step 610. For example, the battery management device 100 can determine a target output value based on the negative electrode voltage value estimated from the negative electrode voltage model and a reference output value obtained based on the battery cell's voltage value, current value, temperature value, and charge state, based on at least one of the battery cell's charge state, voltage value, current value, and temperature value. In step 610 of the battery control method, the corresponding target output value can be determined as the reference output value. The battery management device 100 can perform control with the aim of ensuring that the negative electrode estimated value does not decrease below the lithium deposition value throughout the execution of the battery control method.

[0050] In one embodiment, the battery management device 100 can determine in step 615 whether the estimated negative electrode voltage is less than a first reference value. If the battery management device 100 determines in step 615 that the estimated negative electrode voltage is less than the first reference value, in step 620 it can reduce the target output value to approximately a first control unit value so that the estimated negative electrode voltage is greater than the first reference value. In this case, the first control unit value can be set to be larger the greater the difference between the negative electrode voltage value and the first reference value. If the battery management device 100 determines that the difference between the negative electrode voltage value and the first reference value is large and that lithium deposition is a significant concern, it can set the first control unit value to be set to be larger in order to further reduce the target output value more rapidly. For example, at least one of the first reference value and the first control unit value can be determined based on user input, and the battery management device 100 can perform flexible battery control according to various operating conditions. If the battery management device 100 determines in step 615 that the estimated negative electrode voltage is not below the first reference value, it can repeatedly monitor the estimated negative electrode voltage without changing the target output value.

[0051] In one embodiment, the battery management device 100 can determine in step 625 whether the estimated negative electrode voltage exceeds a second reference value. For example, if the estimated negative electrode voltage exceeds the second reference value, the battery management device 100 can increase the target output value to approximately the second control unit value in step 630, thereby making the estimated negative electrode voltage smaller than the second reference value. In this case, the second control unit value can be set to be larger the greater the difference between the negative electrode voltage value and the second reference value. If the battery management device 100 determines that the difference between the negative electrode voltage value and the second reference value is large, the degree to which lithium deposition is a concern is very small, and that there is no significant concern about lithium deposition even if the charging output used to charge the battery cells is sufficiently increased, it can set the second control unit value to be larger in order to increase the target output value more sufficiently. For example, at least one of the second reference value and the second control unit value can be determined based on user input, and the battery management device 100 can perform flexible battery control according to various operating conditions. If the battery management device 100 determines in step 625 that the estimated negative electrode voltage does not exceed the second reference value, it can repeatedly monitor the estimated negative electrode voltage without changing the reduced target output value.

[0052] In one embodiment, the battery management device 100 can determine in step 635 whether the target output value exceeds the reference output value. If the battery management device 100 increases the target output value in step 630 and then determines in step 635 that the target output value has exceeded the reference output value, it can return to step 610 to determine the target output value as the reference output value and repeat the aforementioned steps. That is, the battery management device 100 monitors the negative electrode voltage value by the voltage value, current value, temperature value, and charge state value of the battery cell, and after obtaining the reference output value, avoids the risk of lithium deposition through continuous monitoring of the negative electrode voltage value, but can flexibly change the target output value considering an appropriate balance with regenerative charging.

[0053] Figure 7 is a block diagram of a battery management device according to one embodiment.

[0054] In one embodiment, the battery management device 100 may include one or more sensors 103 that acquire at least one of the voltage, current, and temperature values ​​of a battery cell, a memory 101, and a processor 102. The battery management device 100 shown in Figure 6 only illustrates the components relating to this embodiment. Therefore, a person ordinary skill in the art relating to this embodiment will understand that in addition to the components shown in Figure 6, other general-purpose components may be included. In one embodiment, the processor 102 may be included in a controller.

[0055] The processor 102 can control the overall operation of the battery management device 100 and process data and signals. The processor 102 may consist of at least one hardware unit. Alternatively, the processor 102 can be operated by one or more software modules generated by executing program code stored in memory 101. The processor 102 may include memory, and the processor 102 can execute program code stored in memory to control the overall operation of the battery management device 100 and process data and signals.

[0056] The processor 102 may be configured to obtain at least one of the voltage, current, and temperature values ​​of a battery cell from one or more sensors 103, calculate the charge state of the battery cell based on at least one of the voltage, current, and temperature values, estimate the negative electrode voltage value based on the charge state of the battery cell, at least one of the voltage, current, and temperature values, and determine the target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

[0057] For example, the processor 102 may be configured to decide to reduce the target output value to approximately a first control unit value if the negative electrode voltage value is less than a first reference value.

[0058] For example, the processor 102 may be configured to decide to increase the target output value to approximately the second control unit value if the negative electrode voltage value exceeds the second reference value.

[0059] For example, the processor 102 may be further configured to determine the target output value to be the same as the reference output value if the target output value exceeds the reference output value due to a change in the target output value.

[0060] Sensor 103 may include multiple sensors and can obtain at least one of the following: voltage, current, and temperature values ​​of a battery cell.

[0061] Depending on the embodiment, the battery management device 100 may additionally include a transceiver for wired / wireless communication. The battery management device 100 can communicate with an external electronic device using the transceiver. The external electronic device may be a terminal or a server. The communication technologies used by the transceiver include GSM (Global System for Mobile Communication), CDMA (Code Division Multi Access), LTE (Long Term Evolution), 5G, WLAN (Wireless LAN), Wi-Fi (Wireless-Fidelity), and Bluetooth (Bluetooth). TM Possible technologies include RFID (Radio Frequency Identification), Infrared Data Association (IrDA), ZigBee (registered trademark), and NFC (Near Field Communication).

[0062] The apparatus according to the above-described embodiment may include a processor, memory for storing and executing program data, permanent storage such as a disk drive, a communication port for communicating with external devices, and user interface devices such as a touch panel, keys, and buttons. A method embodied in a software module or algorithm may be stored on a computer-readable recording medium as computer-readable code or program instructions executable on the processor. Here, computer-readable recording media include magnetic recording media (e.g., ROM (read-only memory), RAM (random-access memory), floppy disks, hard disks, etc.) and optically readable media (e.g., CD-ROM, DVD (Digital Versatile Disc)). Computer-readable recording media may be distributed across a network of computer systems, and computer-readable code may be stored and executed in a distributed manner. The medium is computer-readable, can be stored in memory, and can be executed on the processor.

[0063] This embodiment can be described as a functional block configuration and various processing stages. Such a functional block can be embodied in a variety of hardware and / or software configurations that perform a particular function. For example, the embodiment may employ an integrated circuit configuration such as memory, processing, logic, look-up table, etc., which can perform various functions under the control of one or more microprocessors or other control devices. Just as the components can be executed by software programming or software elements, this embodiment includes various algorithms embodied in combinations of data structures, processes, routines, or other programming configurations, which can be embodied in programming or scripting languages ​​such as C, C++, Java®, assembler, etc. The functional aspects can be embodied in algorithms executed on one or more processors. Furthermore, this embodiment may employ prior art for electronic environment configuration, signal processing, and / or data processing, etc. Terms such as “mechanism,” “element,” “means,” and “configuration” can be used broadly and are not limited to mechanical and physical configurations. The terms can also include the meaning of a series of software processes (routines) in conjunction with a processor, etc.

[0064] The embodiments described above are merely examples, and other embodiments may be embodied within the scope of the claims described later.

Claims

1. In a battery control method performed by a battery management device, A step of obtaining at least one of the following values ​​from one or more sensors: voltage, current, and temperature of a battery cell, A step of calculating the charge state of the battery cell based on at least one of the voltage value, the current value, and the temperature value, A step of estimating the negative electrode voltage value based on at least one of the charge state of the battery cell, the voltage value, the current value, and the temperature value, A battery control method comprising the step of determining a target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

2. The aforementioned decision-making stage is, If the negative electrode voltage value is less than the first reference value, The battery control method according to claim 1, further comprising the step of deciding to reduce the target output value to approximately a first control unit value.

3. The first control unit value is, The battery control method according to claim 2, wherein the larger the difference between the negative electrode voltage value and the first reference value, the larger the determination.

4. At least one of the first reference value and the first control unit value is The battery control method according to claim 2, which is determined based on user input.

5. The aforementioned decision-making stage is, If the negative electrode voltage value exceeds the second reference value, The battery control method according to claim 1, further comprising the step of deciding to increase the target output value to approximately a second control unit value.

6. The second control unit value is, The battery control method according to claim 5, wherein the larger the difference between the negative electrode voltage value and the second reference value, the larger the determination.

7. At least one of the second reference value and the second control unit value is The battery control method according to claim 5, which is determined based on user input.

8. The battery control method according to claim 5, further comprising the step of determining the target output value to be the same as the reference output value if the target output value exceeds the reference output value.

9. The aforementioned reference output value is, The battery control method according to claim 1, which is obtained based on the voltage value, current value, and temperature value of the battery cell and the charge state.

10. A computer-readable non-temporary recording medium that stores a program for causing a server to execute the battery control method described in any one of claims 1 to 9.

11. In a battery management device that performs a battery control method, One or more sensors that acquire at least one of the following values ​​from the battery cell: voltage, current, and temperature, Memory for storing command words, The memory and a processor connected to it are included, The aforementioned processor, At least one of the following values—voltage, current, and temperature—of the battery cell is obtained from one or more of the aforementioned sensors. Based on at least one of the voltage value, current value, and temperature value, the charge state of the battery cell is calculated. Based on at least one of the charge state of the battery cell, the voltage value, the current value, and the temperature value, the negative electrode voltage value is estimated. A battery management device that determines the target output value of the battery cell based on the estimated negative electrode voltage value and the reference output value of the battery cell.

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