Energy storage battery management system and method

Abstract

An energy storage battery management system comprises a charging data acquisition module, a battery diagnosis module, a safety management control module and an adjustment module. The electric data acquisition module is used for acquiring charging data of a battery during charging and sending the charging data to the battery diagnosis module and the safety management control module, and the battery diagnosis module is used for receiving the charging data, calculating the SOH of the battery according to the charging data and sending the SOH to the adjustment module; the safety management control module is used for receiving the charging data, judging the relationship between the charging data and a safety threshold, and stopping charging the battery when the charging data is greater than the safety threshold; the adjusting module is used for receiving the SOH data and adjusting the input current, the input voltage or the safety threshold value of battery charging according to the size of the SOH. And the input current, the input voltage or the safety threshold of charging can be intelligently adjusted. The dynamic adjustment strategy is beneficial to optimizing the charging process, improving the charging efficiency, reducing the damage to the battery and prolonging the service life of the battery.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to an energy storage battery management system and method. Background Art

[0002] Electrochemical energy storage has many advantages, such as short construction period and investment payback period, low environmental requirements, distributed construction, and is suitable for distributed renewable energy storage. Therefore, it is one of the important energy storage technologies for the energy Internet. The safe, healthy, and economical operation of batteries is currently the most critical technical difficulty of electrochemical energy storage. Electrochemical energy storage is currently the mainstream technology for distributed energy storage. It is one of the guarantees for the large-scale use of renewable energy and is also the core technology of electric vehicles. How to develop battery modules with high safety, good economy, environmental protection, and good replicability is the core problem in solving distributed energy storage.

[0003] Charging technology is one of the keys to the healthy and safe use of battery modules. Unreasonable charging methods can significantly shorten the battery life and even cause safety hazards in serious cases. The recent frequent spontaneous combustion of lithium battery electric vehicles and explosions in energy storage power stations have proven to be related to improper battery charging methods. For lead-acid batteries, unscientific charging methods can directly lead to battery sulfation or bulging, which seriously shortens the battery life. Large battery modules are generally composed of multiple cells in series and parallel. Although the consistency of new cells can be guaranteed when grouped, as the battery ages, the consistency will deteriorate. In this way, some cells will inevitably be overcharged during the charging process, causing the battery module to fail. To this end, a system monitors the battery being charged to extend the battery life. Summary of the invention

[0004] In view of the above-mentioned defects, the purpose of the present invention is to provide an energy storage battery management system and method to achieve intelligent regulation of current and voltage when the battery is charged, so as to improve the service life of the battery.

[0005] To achieve this purpose, the present invention adopts the following technical solutions: an energy storage battery management system, including a charging data acquisition module, a battery diagnosis module, a safety management control module and an adjustment module;

[0006] The electric data acquisition module is used to acquire charging data of the battery during charging, and send the charging data to the battery diagnosis module and the safety management control module respectively, wherein the charging data includes real-time current, real-time voltage and real-time temperature during charging;

[0007] The battery diagnosis module is used to receive charging data, calculate the SOH of the battery according to the charging data, and send the SOH to the adjustment module;

[0008] The safety management control module is used to receive charging data, determine the relationship between the charging data and the safety threshold, and stop charging the battery when the charging data is greater than the safety threshold;

[0009] The adjustment module is used to receive the SOH data and adjust the input current, input voltage or safety threshold of the battery charging according to the size of the SOH.

[0010] Preferably, the battery diagnosis module includes a first time data acquisition submodule, a second time data acquisition submodule, a charge and discharge current monitoring submodule and a SOH calculation submodule;

[0011] The first time data acquisition submodule is used to acquire a first open circuit voltage at the moment of battery charging, and send the first open circuit voltage to the SOH calculation submodule;

[0012] The second time data acquisition submodule is used to acquire a second open circuit voltage after the battery is charged for a specific period of time, and send the second open circuit voltage to the SOH calculation submodule;

[0013] The charge and discharge current monitoring submodule is used to record the accumulated power of the battery within a specific period of time, and send the accumulated power to the SOH calculation submodule;

[0014] The SOH calculation submodule is used to obtain a first charge state of a first open circuit voltage and a second charge state of a second open circuit voltage according to a curve of a relationship between an open circuit voltage and a state of charge;

[0015] Obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power;

[0016] The SOH is calculated based on the current battery capacity and the rated battery capacity.

[0017] Preferably, the adjustment module includes a judgment submodule, a first control submodule and a second control submodule;

[0018] The cut-off submodule is used to determine whether the SOH is greater than a control threshold, and if so, call the first control submodule; if so, call the second control submodule;

[0019] The first control submodule is used to adjust the input current and input voltage of the battery charging according to a preset rule;

[0020] The second control submodule is used to adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

[0021] Preferably, the first control submodule performs the following steps:

[0022] Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state;

[0023] Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules;

[0024] The default rules in the initial state are:

[0025] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0026] The default rules for the mid-term state are:

[0027] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0028] The default rules for the later state are:

[0029] The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

[0030] Preferably, the second control submodule includes a state determination unit, a temperature determination unit and an adjustment unit;

[0031] The state determination unit is used to determine the current battery capacity of the battery based on the remaining battery capacity and the accumulated battery capacity, and judge whether the battery capacity has reached the mid-term state. If the battery capacity has not reached the mid-term state, the battery is continuously charged with the current current and voltage until the battery capacity reaches the mid-term state.

[0032] If the intermediate state is reached, a temperature determination unit is called, and the temperature determination unit obtains the optimal temperature of the battery during charging based on the current SOH;

[0033] The regulating unit is used to obtain the current charging temperature, determine whether the charging temperature is greater than the optimal temperature, and if the charging temperature is less than the optimal temperature, charge the battery based on a preset rule;

[0034] If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity;

[0035] The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

[0036] A method for managing an energy storage battery, characterized in that it is applied to an energy storage battery management system and comprises the following steps:

[0037] Step S1: Acquire charging data of the battery during charging;

[0038] Step S2: Calculate the SOH of the battery according to the charging data;

[0039] Step S3: adjusting the input current, input voltage or safety threshold of the battery charging according to the magnitude of the SOH.

[0040] Preferably, the specific steps of step S2 are as follows:

[0041] Step S21: obtaining a first open circuit voltage at the moment of battery charging, and obtaining a second open circuit voltage after the battery is charged for a specific time period;

[0042] Step S22: Recording the accumulated battery power within a specific period of time;

[0043] Step S23: acquiring a first state of charge of a first open circuit voltage and a second state of charge of a second open circuit voltage according to a curve of relationship between the open circuit voltage and the state of charge;

[0044] Step S24: obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power;

[0045] The SOH is calculated based on the current battery capacity and the rated battery capacity.

[0046] Preferably, the specific steps of step S3 are as follows:

[0047] Determine whether the SOH is greater than a control threshold. If so, adjust the input current and input voltage of the battery charging according to a preset rule. If less than the control threshold, adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

[0048] Preferably, the specific steps of adjusting the input current and input voltage of the battery charging according to the preset rules are as follows:

[0049] Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state;

[0050] Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules;

[0051] The default rules in the initial state are:

[0052] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0053] The default rules for the mid-term state are:

[0054] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0055] The default rules for the later state are:

[0056] The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

[0057] Preferably, the steps of adjusting the input current, input voltage and safety threshold of battery charging according to the size of SOH are as follows:

[0058] Based on the remaining battery power and the accumulated power, determine the current battery power, and judge whether the battery power has reached the mid-term state. If it has not reached the mid-term state, continue to charge the battery with the current current and voltage until the battery power reaches the mid-term state.

[0059] If the mid-term state is reached, the optimal temperature of the battery during charging is obtained based on the current SOH;

[0060] Obtain the current charging temperature and determine whether the charging temperature is greater than the optimal temperature. If the charging temperature is less than the optimal temperature, charge the battery based on a preset rule.

[0061] If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity;

[0062] The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

[0063] One of the above technical solutions has the following advantages or beneficial effects: the present invention intelligently adjusts the input current, input voltage or safety threshold of charging according to the SOH data of the battery by setting an adjustment module. This dynamic adjustment strategy helps to optimize the charging process, improve charging efficiency, reduce damage to the battery, and extend the service life of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] Figure 1 It is a schematic diagram of the structure of an embodiment of the system of the present invention.

[0065] Figure 2 is a flow chart of an embodiment of the method of the present invention. DETAILED DESCRIPTION

[0066] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0067] In the description of the embodiments of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, the meaning of "plurality" is two or more. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] like Figures 1-2 As shown, an energy storage battery management system includes a charging data acquisition module, a battery diagnosis module, a safety management control module and an adjustment module;

[0070] The electric data acquisition module is used to acquire charging data of the battery during charging, and send the charging data to the battery diagnosis module and the safety management control module respectively, wherein the charging data includes real-time current, real-time voltage and real-time temperature during charging;

[0071] The battery diagnosis module is used to receive charging data, calculate the SOH of the battery according to the charging data, and send the SOH to the adjustment module;

[0072] The safety management control module is used to receive charging data, determine the relationship between the charging data and the safety threshold, and stop charging the battery when the charging data is greater than the safety threshold;

[0073] The adjustment module is used to receive the SOH data and adjust the input current, input voltage or safety threshold of the battery charging according to the size of the SOH.

[0074] In order to safely charge and ensure the life of the battery, the present invention is provided with a charging data acquisition module, a battery diagnosis module, a safety management control module and an adjustment module. Before charging the battery, the battery needs to be stationary for a period of time to ensure that the reactants in the battery stop reacting, and then the battery is charged. During the charging process, the charging data of the battery will be obtained, wherein the charging data includes the real-time current, real-time voltage and real-time temperature in the battery. At this time, the battery diagnosis module will obtain the battery SOH (State of Health) based on the charging data, because different charging currents and voltages are required to effectively improve the life of the battery in different SOHs. For example, in low SOH, it is necessary to use relatively low input current and input voltage even in the fast charging state to avoid excessive input current and input voltage from causing additional pressure on the battery, thereby further reducing the battery SOH. At the same time, the present invention is also provided with a safety management control module, which monitors the size relationship between the charging data of each battery and the safety threshold. When the charging data is greater than the safety threshold, the battery is stopped from being charged to ensure the safety of the battery during charging.

[0075] The present invention intelligently adjusts the charging input current, input voltage or safety threshold according to the battery SOH data by setting an adjustment module. This dynamic adjustment strategy helps to optimize the charging process, improve charging efficiency, reduce damage to the battery, and extend the battery life.

[0076] Preferably, the battery diagnosis module includes a first time data acquisition submodule, a second time data acquisition submodule, a charge and discharge current monitoring submodule and a SOH calculation submodule;

[0077] The first time data acquisition submodule is used to acquire a first open circuit voltage at the moment of battery charging, and send the first open circuit voltage to the SOH calculation submodule;

[0078] The second time data acquisition submodule is used to acquire a second open circuit voltage after the battery is charged for a specific period of time, and send the second open circuit voltage to the SOH calculation submodule;

[0079] The charge and discharge current monitoring submodule is used to record the accumulated power of the battery within a specific period of time, and send the accumulated power to the SOH calculation submodule;

[0080] The SOH calculation submodule is used to obtain a first charge state of a first open circuit voltage and a second charge state of a second open circuit voltage according to a curve of a relationship between an open circuit voltage and a state of charge;

[0081] Obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power;

[0082] The SOH is calculated based on the current battery capacity and the rated battery capacity.

[0083] In the present invention, when the battery starts to charge, the open circuit voltage of the battery at the moment of charging is obtained, and then the second open circuit voltage is obtained after waiting for a specific period of time (5min to 20min), and the first charge state of the first open circuit voltage and the second charge state of the second open circuit voltage can be obtained respectively according to the open circuit voltage and charge state relationship curve. In the charge and discharge current monitoring submodule, the cumulative power of the battery within a specific period of time can be obtained by time integration. The SOH calculation submodule obtains the current battery capacity based on the charge difference between the first charge state and the second charge state and the cumulative power;

[0084] The formula for obtaining the current battery capacity is as follows: Where ΔQ is the accumulated charge, and ΔSOC is the difference between the first state of charge and the second state of charge;

[0085] In a normal battery, when charging at a certain current and voltage for a specific period of time, the battery capacity is fixed (rated battery capacity). At this time, the current battery capacity that can be calculated can be compared with the rated battery capacity to obtain the corresponding SOH. Where Q o is the rated battery capacity.

[0086] Preferably, the adjustment module includes a judgment submodule, a first control submodule and a second control submodule;

[0087] The cut-off submodule is used to determine whether the SOH is greater than a control threshold, and if so, call the first control submodule; if so, call the second control submodule;

[0088] The first control submodule is used to adjust the input current and input voltage of the battery charging according to a preset rule;

[0089] The second control submodule is used to adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

[0090] After obtaining the battery's SOH, the charging current and voltage will be adjusted according to the battery's SOH. When the battery's SOH is greater than the threshold, it means that the battery is relatively healthy and can be charged according to the preset rules to quickly charge the battery. When the battery's SOH is less than the threshold, it means that the battery is not so healthy. At this time, it is necessary to appropriately reduce the input current and input voltage. As the input current and input voltage are reduced, the safety threshold should also be reduced in proportion to ensure that the battery can be charged safely.

[0091] Preferably, the first control submodule performs the following steps:

[0092] Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state;

[0093] Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules;

[0094] The default rules in the initial state are:

[0095] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0096] The default rules for the mid-term state are:

[0097] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0098] The default rules for the later state are:

[0099] The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

[0100] Since the capacity of different batteries is different, the degree of remaining power is also different. Therefore, after charging for a specific period of time, the state of the battery capacity is also different. In order to speed up the charging efficiency, different input currents and input voltages will be controlled according to different battery capacities in the preset rules. For example, in the initial state (battery capacity is 0-60%), it means that the current battery capacity is low, and the threshold voltage refers to the voltage at which the internal voltage of the battery enters the trickle charge after meeting the voltage value. Charging by the maximum input current and threshold voltage of the charger can make the power replenished quickly. The power can enter the mid-term state (60%-90%), and after reaching the mid-term state, since the amount of battery to be replenished is not much, in order to reduce the impact of the heat generated during charging on the battery, in the present invention, the input current will be reduced, and half of the maximum input current of the charger will be used as the input current. The battery capacity of the battery can be replenished slowly when the temperature is lowered. When the late state is reached, the amount of battery to be replenished is very small, and the trickle mode can be used with 500mA as the input current to ensure that the battery is truly saturated and extend the battery life.

[0101] Preferably, the second control submodule includes a state determination unit, a temperature determination unit and an adjustment unit;

[0102] The state determination unit is used to determine the current battery capacity of the battery based on the remaining battery capacity and the accumulated battery capacity, and judge whether the battery capacity has reached the mid-term state. If the battery capacity has not reached the mid-term state, the battery is continuously charged with the current current and voltage until the battery capacity reaches the mid-term state.

[0103] If the intermediate state is reached, a temperature determination unit is called, and the temperature determination unit obtains the optimal temperature of the battery during charging based on the current SOH;

[0104] The regulating unit is used to obtain the current charging temperature, determine whether the charging temperature is greater than the optimal temperature, and if the charging temperature is less than the optimal temperature, charge the battery based on a preset rule;

[0105] If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity;

[0106] The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

[0107] In the present invention, the second control submodule mainly controls the input current and input voltage of the mid-term state, because in the early state, after high voltage and high current charging, the material reaction in the battery has been very intense, and the temperature at this time is relatively high. Compared with the low SOH battery, if the current and voltage of the preset rules in the original mid-term state are used for charging, the battery temperature will be further increased and the battery SOH will be further reduced. For this reason, the state determination unit will monitor the low SOH battery state in the second control submodule, and when it enters the mid-term state, the optimal temperature of the battery during charging will be obtained based on the current SOH;

[0108] The formula for obtaining the optimal temperature is as follows:

[0109]

[0110] Where AH is the current battery capacity, ω is the power law factor of capacity attenuation, α is the constant coefficient, β is the proportional coefficient, C is the charging rate at the current state stage, and B k is the pre-exponential factor of capacity attenuation.

[0111] When the charging temperature is not higher than the optimal temperature, it means that the temperature at this time will not affect the life of the battery, and the preset rules of the mid-term state can continue to be used for charging to ensure the charging efficiency. When the charging temperature is higher than the optimal temperature, if the preset rules of the mid-term state are continued to be used for charging, the temperature will increase, which will reduce the battery life in the case of long-term charging. Therefore, it is necessary to reduce the input current and input voltage at this time to reduce the temperature during charging. In the present invention, the input current and input voltage of the preset rules in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity. The specific input current adjustment formula is as follows:

[0112]

[0113] Among them I m The input current of the preset rule for the mid-term state, T op is the charging temperature, T s To adjust the safety threshold of the input current before, SOC is the current state of charge.

[0114] V′=V m *(1+kr*(T b -T op ));

[0115] V m The preset rule input voltage in the mid-term state, kr temperature adjustment coefficient of the charging voltage, is usually a constant less than 1 (the value is usually between 0.05 and 0.1).

[0116] Since the input current and input voltage are reduced, the safety threshold also needs to be reduced in a corresponding ratio. For example, the input current before adjustment is I, and after adjustment it is 0.8I. At this time, the current adjustment ratio is 0.8. Multiply the input current safety threshold by 0.8 to get the input current safety threshold after adjustment. Similarly, the input voltage safety threshold is also adjusted.

[0117] A method for managing an energy storage battery, characterized in that it is applied to an energy storage battery management system and comprises the following steps:

[0118] Step S1: Acquire charging data of the battery during charging;

[0119] Step S2: Calculate the SOH of the battery according to the charging data;

[0120] Step S3: adjusting the input current, input voltage or safety threshold of the battery charging according to the magnitude of the SOH.

[0121] Preferably, the specific steps of step S2 are as follows:

[0122] Step S21: obtaining a first open circuit voltage at the moment of battery charging, and obtaining a second open circuit voltage after the battery is charged for a specific time period;

[0123] Step S22: Recording the accumulated battery power within a specific period of time;

[0124] Step S23: acquiring a first state of charge of a first open circuit voltage and a second state of charge of a second open circuit voltage according to a curve of relationship between the open circuit voltage and the state of charge;

[0125] Step S24: obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power;

[0126] The SOH is calculated based on the current battery capacity and the rated battery capacity.

[0127] Preferably, the specific steps of step S3 are as follows:

[0128] Determine whether the SOH is greater than a control threshold. If so, adjust the input current and input voltage of the battery charging according to a preset rule. If less than the control threshold, adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

[0129] Preferably, the specific steps of adjusting the input current and input voltage of the battery charging according to the preset rules are as follows:

[0130] Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state;

[0131] Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules;

[0132] The default rules in the initial state are:

[0133] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0134] The default rules for the mid-term state are:

[0135] Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode;

[0136] The default rules for the later state are:

[0137] The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

[0138] Preferably, the steps of adjusting the input current, input voltage and safety threshold of battery charging according to the size of SOH are as follows:

[0139] Based on the remaining battery power and the accumulated power, determine the current battery power, and judge whether the battery power has reached the mid-term state. If it has not reached the mid-term state, continue to charge the battery with the current current and voltage until the battery power reaches the mid-term state.

[0140] If the mid-term state is reached, the optimal temperature of the battery during charging is obtained based on the current SOH;

[0141] Obtain the current charging temperature and determine whether the charging temperature is greater than the optimal temperature. If the charging temperature is less than the optimal temperature, charge the battery based on a preset rule.

[0142] If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity;

[0143] The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

[0144] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0145] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An energy storage battery management system, characterized in that: It includes a charging data acquisition module, a battery diagnosis module, a safety management control module and an adjustment module; The electric data acquisition module is used to acquire charging data of the battery during charging, and send the charging data to the battery diagnosis module and the safety management control module respectively, wherein the charging data includes real-time current, real-time voltage and real-time temperature during charging; The battery diagnosis module is used to receive charging data, calculate the SOH of the battery according to the charging data, and send the SOH to the adjustment module; The safety management control module is used to receive charging data, determine the relationship between the charging data and the safety threshold, and stop charging the battery when the charging data is greater than the safety threshold; The adjustment module is used to receive the SOH data and adjust the input current, input voltage or safety threshold of the battery charging according to the size of the SOH.

2. An energy storage battery management system according to claim 1, characterized in that: The battery diagnosis module includes a first time data acquisition submodule, a second time data acquisition submodule, a charge and discharge current monitoring submodule and a SOH calculation submodule; The first time data acquisition submodule is used to acquire a first open circuit voltage at the moment of battery charging, and send the first open circuit voltage to the SOH calculation submodule; The second time data acquisition submodule is used to acquire a second open circuit voltage after the battery is charged for a specific period of time, and send the second open circuit voltage to the SOH calculation submodule; The charge and discharge current monitoring submodule is used to record the accumulated power of the battery within a specific period of time, and send the accumulated power to the SOH calculation submodule; The SOH calculation submodule is used to obtain a first charge state of a first open circuit voltage and a second charge state of a second open circuit voltage according to a curve of a relationship between an open circuit voltage and a state of charge; Obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power; The SOH is calculated based on the current battery capacity and the rated battery capacity.

3. The energy storage battery management system according to claim 1, characterized in that: The adjustment module includes a judgment submodule, a first control submodule and a second control submodule; The cut-off submodule is used to determine whether the SOH is greater than a control threshold, and if so, call the first control submodule; if so, call the second control submodule; The first control submodule is used to adjust the input current and input voltage of the battery charging according to a preset rule; The second control submodule is used to adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

4. The energy storage battery management system according to claim 3, characterized in that: The first control submodule performs the following steps: Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state; Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules; The default rules in the initial state are: Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode; The default rules for the mid-term state are: Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode; The default rules for the later state are: The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

5. The energy storage battery management system according to claim 4, characterized in that: The second control submodule includes a state determination unit, a temperature determination unit and an adjustment unit; The state determination unit is used to determine the current battery capacity of the battery based on the remaining battery capacity and the accumulated battery capacity, and judge whether the battery capacity has reached the mid-term state. If the battery capacity has not reached the mid-term state, the battery is continuously charged with the current current and voltage until the battery capacity reaches the mid-term state. If the intermediate state is reached, a temperature determination unit is called, and the temperature determination unit obtains the optimal temperature of the battery during charging based on the current SOH; The regulating unit is used to obtain the current charging temperature, determine whether the charging temperature is greater than the optimal temperature, and if the charging temperature is less than the optimal temperature, charge the battery based on a preset rule; If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity; The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

6. A method for managing an energy storage battery, characterized in that: An energy storage battery management system applied to any one of claims 1 to 5 comprises the following steps: Step S1: Acquire charging data of the battery during charging; Step S2: Calculate the SOH of the battery according to the charging data; Step S3: adjusting the input current, input voltage or safety threshold of the battery charging according to the magnitude of the SOH.

7. The energy storage battery management method according to claim 6, characterized in that: The specific steps of step S2 are as follows: Step S21: obtaining a first open circuit voltage at the moment of battery charging, and obtaining a second open circuit voltage after the battery is charged for a specific time period; Step S22: Recording the accumulated battery power within a specific period of time; Step S23: acquiring a first state of charge of a first open circuit voltage and a second state of charge of a second open circuit voltage according to a curve of relationship between the open circuit voltage and the state of charge; Step S24: obtaining the current battery capacity according to the charge difference between the first charge state and the second charge state and the accumulated power; The SOH is calculated based on the current battery capacity and the rated battery capacity.

8. The energy storage battery management method according to claim 6, characterized in that: The specific steps of step S3 are as follows: Determine whether the SOH is greater than a control threshold. If so, adjust the input current and input voltage of the battery charging according to a preset rule. If less than the control threshold, adjust the input current, input voltage and safety threshold of the battery charging according to the size of the SOH.

9. The energy storage battery management method according to claim 8, characterized in that: The specific steps for adjusting the input current and input voltage of battery charging according to the preset rules are as follows: Based on the remaining battery power and the accumulated battery power, determine the current battery power, wherein the battery power includes an initial state, a mid-term state, and a late state; Obtain the battery level in real time and adjust the input current and input voltage according to the battery level and preset rules; The default rules in the initial state are: Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode; The default rules for the mid-term state are: Obtain the threshold voltage of the battery, use the threshold voltage as the input voltage, use half of the maximum input current of the charger as the input current, and charge the battery in a constant voltage and constant current charging mode; The default rules for the later stage are: The standard maximum voltage of the battery is obtained, and the standard maximum voltage is used as the input voltage, and 500mA is used as the input current to charge the battery in a constant voltage and constant current charging mode.

10. The energy storage battery management method according to claim 8, characterized in that: The steps for adjusting the input current, input voltage, and safety threshold of battery charging according to the size of SOH are as follows: Based on the remaining battery power and the accumulated power, determine the current battery power, and judge whether the battery power has reached the mid-term state. If it has not reached the mid-term state, continue to charge the battery with the current current and voltage until the battery power reaches the mid-term state. If the mid-term state is reached, the optimal temperature of the battery during charging is obtained based on the current SOH; Obtain the current charging temperature and determine whether the charging temperature is greater than the optimal temperature. If the charging temperature is less than the optimal temperature, charge the battery based on a preset rule. If the charging temperature is greater than the optimal temperature, the input current and input voltage of the preset rule in the mid-term state are adjusted based on the charging temperature, the optimal temperature and the current battery capacity; The current safety threshold is adjusted based on the percentage of the adjusted input current to the input current in the preset rule, and the voltage safety threshold is adjusted based on the percentage of the adjusted input voltage to the input voltage in the preset rule.

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