Silicon-carbon battery charging and discharging management method, device and equipment and storage medium

Abstract

The invention provides a silicon-carbon battery charging and discharging management method, device and equipment and a storage medium, and relates to the technical field of battery charging and discharging management. The method comprises the following steps: dividing a silicon-carbon battery capacity interval of a silicon-carbon battery to be detected into a silicon capacity interval and a graphite capacity interval, and respectively determining a silicon capacity attenuation degree and a graphite capacity attenuation degree of the silicon-carbon battery to be detected in a current state; and then adjusting the initial full charge voltage of the to-be-tested silicon-carbon battery in the graphite capacity interval based on the graphite capacity attenuation degree, and adjusting the initial discharge cut-off voltage of the to-be-tested silicon-carbon battery in the silicon capacity interval based on the silicon capacity attenuation degree. On the basis, the capacity attenuation trend of the silicon-carbon battery is managed in a partitioned manner according to the silicon material and the graphite material, so that the technical problem of difficulty in collaborative management of silicon capacity attenuation and graphite capacity attenuation in the silicon-carbon battery is solved, the service life of the battery is effectively prolonged, and the stability and the use efficiency of the battery are improved.

Description

Technical Field

[0001] This invention relates to the field of battery management technology, and more specifically, to a method, apparatus, device, and storage medium for managing the charging and discharging of silicon-carbon batteries. Background Technology

[0002] With the rapid development of electric vehicles and portable electronic devices, the demand for high-energy-density batteries is increasing. Silicon-carbon composite materials are considered one of the key anode materials for next-generation lithium-ion batteries due to their theoretical specific capacity being much higher than that of traditional graphite anodes. In practical applications, silicon-carbon batteries mitigate the problem of huge volume expansion during charge and discharge of pure silicon anodes by combining silicon materials with a carbon matrix, while maintaining high energy density. However, due to the significant volume change of silicon during lithium intercalation, active materials crack, SEI film grows repeatedly, and electrolyte is continuously consumed. Therefore, silicon-carbon batteries generally suffer from technical challenges such as short lifespan, easy expansion, and rapid capacity decay during charge and discharge cycles.

[0003] To extend battery life, existing technologies generally employ state-of-health (SOH)-based charging management algorithms for lifespan regulation. Traditional long-life charging management strategies largely rely on SOH trend analysis across the entire voltage range, a method that has been widely validated and proven effective in systems such as lithium cobalt oxide. However, in silicon-carbon batteries, the capacity decay mechanisms of silicon and graphite components during cycling are asynchronous, with significant differences in their respective decay paths and rates. This results in a lack of consistent correlation between changes in the overall voltage plateau and actual capacity degradation. Consequently, SOH assessment based on the entire voltage range cannot accurately characterize the actual aging state of silicon-carbon batteries, thus limiting the effective application of existing charging management schemes in this type of battery. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a method, apparatus, device and storage medium for charging and discharging management of silicon-carbon batteries. The method divides the full voltage range of silicon-carbon batteries based on the characteristics of the anode material, and simultaneously adjusts the voltage threshold within the divided range based on the capacity decay trend of the corresponding material, so as to solve the technical problem that it is difficult to coordinate the management of silicon capacity and graphite capacity decay in silicon-carbon batteries.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, the present invention provides a method for managing the charge and discharge of a silicon-carbon battery, the method comprising: The capacity range of the silicon-carbon battery under test is divided into a silicon capacity range and a graphite capacity range. The silicon-carbon battery capacity range is used to characterize the full voltage range consisting of the discharge cutoff voltage and the full charge voltage. The lower limit voltage of the silicon capacity range is the initial discharge cutoff voltage of the silicon-carbon battery under test, and the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test. Determine the degree of silicon capacity decay of the silicon-carbon battery under test in the silicon capacity range, and determine the degree of graphite capacity decay of the silicon-carbon battery under test in the graphite capacity range. The initial full charge voltage of the silicon-carbon battery under test is adjusted within the graphite capacity range based on the graphite capacity decay rate, and the initial discharge cutoff voltage of the silicon-carbon battery under test is adjusted within the silicon capacity range based on the silicon capacity decay rate.

[0006] Optionally, the step of dividing the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range includes: The initial discharge cutoff voltage and initial full charge voltage of the silicon-carbon battery under test are determined, and the zone voltage of the silicon-carbon battery under test is determined based on differential capacity analysis. The silicon capacity range is obtained by using the partition voltage as the upper limit voltage of the silicon capacity range and the initial discharge cutoff voltage as the lower limit voltage of the silicon capacity range; the graphite capacity range is obtained by using the partition voltage as the lower limit voltage of the graphite capacity range and the initial full charge voltage as the upper limit voltage of the graphite capacity range.

[0007] Optionally, the step of determining the partition voltage of the silicon-carbon battery under test based on differential capacity analysis includes: Determine the change in discharge voltage per unit time of the silicon-carbon battery under test during the preset discharge process; wherein, the preset discharge process is used to characterize the process of discharging the silicon-carbon battery under test in a fully charged state according to the preset current until the preset cutoff voltage is reached. Determine the capacity change per unit time of the silicon-carbon battery under test during a preset discharge process; A differential voltage curve is generated based on the changes in discharge voltage and capacity. The maximum value of the differential voltage curve is taken as the zone voltage of the silicon-carbon battery under test.

[0008] Optionally, the step of determining the degree of silicon capacity decay of the silicon-carbon battery under test in the silicon capacity range includes: determining the silicon capacity of the silicon-carbon battery under test in the silicon capacity range under the current state; and obtaining the degree of silicon capacity decay under the current state based on the ratio of the silicon capacity to the initial silicon capacity. And / or, the steps for determining the degree of graphite capacity decay of the silicon-carbon battery under test within the graphite capacity range include: determining the graphite capacity of the silicon-carbon battery under test within the graphite capacity range in the current state; and obtaining the degree of graphite capacity decay in the current state based on the ratio of the graphite capacity to the initial graphite capacity.

[0009] Optionally, the step of adjusting the initial full-charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay includes: The descent limit value corresponding to the full charge voltage of the silicon-carbon battery under test is determined based on the first preset rule. The graphite capacity adjustment range is determined based on the initial full charge voltage and the drop limit value; The graphite adjustment value is obtained based on the degree of graphite capacity decay and the graphite capacity adjustment range. The initial full charge voltage of the silicon-carbon battery under test is updated based on the graphite adjustment value, and the updated full charge voltage of the silicon-carbon battery under test in the current state is obtained.

[0010] Optionally, the formula for calculating the initial full-charge voltage of the silicon-carbon battery under test based on the graphite adjustment value is expressed as follows: ; In the formula, The updated full-charge voltage of the silicon-carbon battery under test in its current state; The initial full charge voltage of the silicon-carbon battery under test; The degree of graphite capacity decay; This is the minimum range corresponding to the graphite adjustment range.

[0011] Optionally, the step of adjusting the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay includes: The rise limit value corresponding to the discharge cutoff voltage of the silicon-carbon battery under test is determined based on the second preset rule. The silicon capacity adjustment range is determined based on the initial discharge cutoff voltage and the rise limit value. The silicon adjustment value is obtained based on the degree of silicon capacity decay and the silicon capacity adjustment range; The initial discharge cutoff voltage of the silicon-carbon battery under test is updated based on the silicon adjustment value, and the updated discharge cutoff voltage of the silicon-carbon battery under test in the current state is obtained.

[0012] Optionally, the formula for updating the initial full-charge voltage of the silicon-carbon battery under test based on the silicon adjustment value is expressed as: ; In the formula, This represents the updated discharge cutoff voltage of the silicon-carbon battery under test in its current state. The initial discharge cutoff voltage of the silicon-carbon battery under test is denoted as . This refers to the degree of silicon capacity decay. This is the minimum range corresponding to the silicon adjustment range.

[0013] Secondly, the present invention also provides a silicon-carbon battery charge and discharge management device, comprising: The capacity division module is used to divide the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range. The silicon-carbon battery capacity range is used to characterize the full voltage range consisting of the discharge cut-off voltage and the full charge voltage. Among them, the lower limit voltage of the silicon capacity range is the initial discharge cut-off voltage of the silicon-carbon battery under test, and the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test. The degradation degree determination module is used to determine the degree of silicon capacity degradation of the silicon-carbon battery under test in the silicon capacity range and the degree of graphite capacity degradation of the silicon-carbon battery under test in the graphite capacity range. The battery charge / discharge adjustment module is used to adjust the initial full charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay, and to adjust the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay.

[0014] Thirdly, the present invention also provides an electronic device, including a processor and a memory, wherein the memory stores machine-executable instructions that can be executed by the processor, and the processor can execute the machine-executable instructions to implement the silicon-carbon battery charging and discharging management method of any of the first aspects above.

[0015] Fourthly, the present invention also provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the silicon-carbon battery charge-discharge management method as described in any of the first aspects above.

[0016] The silicon-carbon battery charge / discharge management method, apparatus, device, and storage medium provided in this invention have the following beneficial effects: This invention divides the capacity range of a silicon-carbon battery under test into a silicon capacity range and a graphite capacity range; and determines the degree of capacity decay of both graphite and silicon in the current state. Then, based on the degree of graphite capacity decay, the initial full-charge voltage of the silicon-carbon battery under test is adjusted within the graphite capacity range; simultaneously, based on the degree of silicon capacity decay, the initial discharge cutoff voltage of the silicon-carbon battery under test is adjusted within the silicon capacity range. Based on this, this invention manages the capacity decay trend of silicon-carbon batteries according to silicon and graphite material zones, solving the technical problem of the difficulty in coordinating the management of silicon and graphite capacity decay in silicon-carbon batteries, effectively extending battery life and improving battery stability and efficiency.

[0017] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A flowchart illustrating the steps of the silicon-carbon battery charge and discharge management method provided in an embodiment of the present invention is shown. Figure 2 A flowchart of step 100 in an embodiment of the present invention is shown; Figure 3 A flowchart of step 102 in an embodiment of the present invention is shown; Figure 4 A schematic diagram of the differential voltage curve according to an embodiment of the present invention is shown; Figure 5 This illustrates one of the flowcharts for step 200 in an embodiment of the present invention; Figure 6 One of the flowcharts for step 300 in an embodiment of the present invention is shown; Figure 7 This is a second flowchart of step 200 in an embodiment of the present invention; Figure 8 This is a second flowchart of step 300 in an embodiment of the present invention; Figure 9 A schematic diagram of the silicon-carbon battery charge and discharge management device in an embodiment of the present invention is shown.

[0020] Icons: 10 - Silicon-carbon battery charge / discharge management device; 11 - Capacity allocation module; 12 - Attenuation degree determination module; 13 - Battery charge / discharge adjustment module; Detailed Implementation The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0023] Please refer to Figure 1 , Figure 1 A flowchart of the steps of the silicon-carbon battery charge and discharge management method provided in the embodiment of the present invention is shown, which includes steps 100 to 300.

[0024] Step 100: Divide the capacity range of the silicon-carbon battery to be tested into a silicon capacity range and a graphite capacity range.

[0025] In this embodiment, the capacity range of the silicon-carbon battery is used to characterize the full voltage range consisting of the discharge cutoff voltage and the full charge voltage. The lower limit voltage of the silicon capacity range is the initial discharge cutoff voltage of the silicon-carbon battery under test; the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test.

[0026] Step 200: Determine the degree of silicon capacity decay of the silicon-carbon battery under test in the silicon capacity range, and determine the degree of graphite capacity decay of the silicon-carbon battery under test in the graphite capacity range.

[0027] Step 300: Adjust the initial full charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the graphite capacity decay, and adjust the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the silicon capacity decay.

[0028] In this embodiment, the capacity range of the silicon-carbon battery, i.e. the full voltage range of the silicon-carbon battery, is divided into a silicon capacity range and a graphite capacity range. Then, the silicon capacity decay rate and the graphite capacity decay rate of the silicon-carbon battery under test are calculated based on the silicon capacity range and the graphite capacity range, respectively. Subsequently, the initial full charge voltage of the silicon-carbon battery under test is adjusted within the graphite capacity range based on the graphite capacity decay rate, and the initial discharge cutoff voltage of the silicon-carbon battery under test is adjusted within the silicon capacity range based on the silicon capacity decay rate.

[0029] Based on this, this embodiment can achieve independent management of the SOH conversion trend by simultaneously managing the graphite capacity decay rate and the silicon capacity decay rate, effectively solving the technical problem of the difficulty in coordinating the management of silicon capacity and graphite capacity decay in silicon-carbon batteries, further extending the life of silicon-carbon batteries and improving battery stability and efficiency.

[0030] Furthermore, for accurate prediction or determination of the aging degree of the silicon-carbon battery under test, please refer to [reference needed]. Figure 2 , Figure 2 The flowchart of step 100 in this embodiment of the invention is shown. In this embodiment, step 100, which divides the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range, includes steps 101 to 102.

[0031] Step 101: Determine the initial discharge cutoff voltage and initial full charge voltage of the silicon-carbon battery under test, and determine the zone voltage of the silicon-carbon battery under test based on differential capacity analysis. Step 102: Using the partition voltage as the upper limit voltage of the silicon capacity range and the initial discharge cutoff voltage as the lower limit voltage of the silicon capacity range, the silicon capacity range is obtained; using the partition voltage as the lower limit voltage of the graphite capacity range and the initial full charge voltage as the upper limit voltage of the graphite capacity range, the graphite capacity range is obtained.

[0032] This embodiment can achieve zoning based on the properties of silicon and graphite materials. Specifically, since silicon-carbon battery materials include silicon and graphite, and silicon capacity typically plays a role at the end of the discharge cycle of a silicon-carbon battery, this embodiment can determine the starting point of the silicon capacity voltage range based on differential capacity analysis.

[0033] Based on this, please refer to Figure 3 , Figure 3 The flowchart of step 102 in an embodiment of the present invention is shown. Step 102, which determines the partition voltage of the silicon-carbon battery under test based on differential capacity analysis, includes steps 1021 to 1023.

[0034] Step 1021: Determine the change in discharge voltage per unit time of the silicon-carbon battery under test during the preset discharge process.

[0035] The preset discharge process is used to characterize the process of discharging the silicon-carbon battery under test in a fully charged state according to a preset current until the preset cutoff voltage is reached.

[0036] Step 1022: Determine the capacity change value per unit time of the silicon-carbon battery under test during the preset discharge process.

[0037] Step 1023: Generate a differential voltage curve based on the discharge voltage change value and capacity change value, and take the maximum value of the differential voltage curve as the partition voltage of the silicon-carbon battery under test.

[0038] In one possible implementation, the silicon-carbon battery under test is fully charged and then discharged at 0.2C. The voltage change per unit time (1 second) is dV, and the capacity change per unit time (1 second) is dq. The differential voltage curve is obtained by calculating the voltage change / capacity change per unit time (1 second) as dV / dq. Since silicon capacity is greater than graphite capacity per unit voltage change, this embodiment can use the maximum value or highest point of the differential voltage curve dV / dq as the starting point for the silicon capacity voltage.

[0039] Assuming the initial full-charge voltage of the silicon-carbon battery under test is 4.85V and the initial discharge cutoff voltage is 3.0V, please refer to... Figure 4 , Figure 4 A schematic diagram of the differential voltage curve in an embodiment of the present invention is shown. Figure 4 As can be seen, the maximum value of the differential voltage curve dV / dq corresponding to the silicon-carbon battery under test in this embodiment is 3.7V. Based on this, this embodiment can manage the high voltage region by using graphite capacity decay, that is, the graphite capacity range in this embodiment satisfies: (3.7V, 4.53V), and manage the low voltage region by using silicon capacity decay, that is, the silicon capacity range in this embodiment satisfies: (3.0V, 3.7V).

[0040] Furthermore, taking the degree of graphite capacity decay as an example, please refer to... Figure 5 , Figure 5 A flowchart of step 200 in an embodiment of the present invention is shown, wherein step 200 includes steps 201A to 202A.

[0041] Step 201A: Determine the graphite capacity of the silicon-carbon battery under test within the graphite capacity range under the current state.

[0042] Step 202A: Based on the ratio of graphite capacity to initial graphite capacity, the degree of graphite capacity decay in the current state is obtained.

[0043] Based on this, this embodiment can intelligently control the decrease of charging voltage within the graphite capacity range (3.7V, 4.53V) according to the degree of graphite capacity decay under the current state.

[0044] In this embodiment, the initial graphite capacity Qc0 and the current graphite capacity Qc of the silicon-carbon battery under test can be directly determined by measurement. Then, based on the ratio between the initial graphite capacity Qc0 and the current graphite capacity Qc, the degree of graphite capacity decay SOHc in the current state is determined. That is, the formula for calculating the degree of decay SOHc can be expressed as: SOHc=Qc / Qc0*100. The degree of decay SOHc can be confirmed as a percentage. After confirming the degree of decay SOHc, the initial charging voltage drop can be controlled by judging the degree of graphite capacity decay SOHc.

[0045] For details, please refer to Figure 6 , Figure 6 A flowchart of step 300 in an embodiment of the present invention is shown, wherein step 300 includes steps 301A to 304A.

[0046] Step 301A: Determine the descent limit value corresponding to the full charge voltage of the silicon-carbon battery under test based on the first preset rule.

[0047] Step 302A: Determine the graphite capacity adjustment range based on the initial full charge voltage and the drop limit value.

[0048] Step 303A: Obtain the graphite adjustment value based on the degree of graphite capacity decay and the graphite capacity adjustment range.

[0049] Step 304A: Update the initial full charge voltage of the silicon-carbon battery under test based on the graphite adjustment value to obtain the updated full charge voltage of the silicon-carbon battery under test in the current state.

[0050] In this embodiment, the calculation formula for updating the initial full-charge voltage of the silicon-carbon battery under test based on the graphite adjustment value is expressed as follows: ; In the formula, The updated full-charge voltage of the silicon-carbon battery under test in its current state; The initial full charge voltage of the silicon-carbon battery under test; The degree of graphite capacity decay; This is the minimum range corresponding to the graphite adjustment range.

[0051] In one possible implementation, this embodiment can determine the updated full-charge voltage of the silicon-carbon battery under test in the current state through a cyclic learning method.

[0052] Specifically, in this embodiment, the descent limit value corresponding to the full charge voltage of the silicon-carbon battery under test can be determined primarily based on a setting, namely a first preset rule.

[0053] It should be noted that this embodiment does not limit the specific method of the first preset rule. In this embodiment, the first preset rule can be confirmed by the user based on the battery capacity and battery life requirements.

[0054] In one possible implementation, if it is necessary to ensure that the battery capacity of the silicon-carbon battery under test remains greater than 80% during its life cycle, and if the initial full charge voltage of the silicon-carbon battery under test is 4.85V and the initial discharge cutoff voltage is 3.0V, then in this embodiment, the drop limit value corresponding to the full charge voltage of the silicon-carbon battery under test is 4.48V.

[0055] Based on this, the graphite adjustment range corresponding to this embodiment is actually 0.05V (that is, the difference between the initial full charge voltage of 4.85V and the drop limit value of 4.48V). If the 5th-order cyclic learning method is used in this embodiment, at this time, a 1% decrease in graphite capacity corresponds to a 10mV decrease in charging voltage (that is, 0.05V / 5=10mV), and 10mV is the minimum range corresponding to the graphite adjustment range.

[0056] Based on this, this embodiment can reduce the degradation by reducing the initial full charge voltage of the silicon-carbon battery under test to obtain the updated full charge voltage of the silicon-carbon battery under test in the current state.

[0057] In this embodiment, the method for determining the graphite adjustment value can be understood as follows: if the calculated graphite capacity decay is 1%, then the initial full charge voltage of 4.85V is reduced by 10mV; similarly, if the calculated graphite capacity decay is 5%, then the initial full charge voltage of 4.85V is reduced by 50mV.

[0058] Following the same approach as the previous embodiment, taking silicon capacity decay as an example, please refer to... Figure 7 , Figure 7 A flowchart of another step of step 200 in an embodiment of the present invention is shown, wherein step 200 includes steps 201B to 202B.

[0059] Step 201B: Determine the silicon capacity of the silicon-carbon battery under test within the silicon capacity range under the current state; Step 202B: Based on the ratio of silicon capacity to initial silicon capacity, determine the degree of silicon capacity decay in the current state.

[0060] In this embodiment, the initial silicon capacity Qsi0 and the silicon capacity Qsi of the silicon-carbon battery under test can be directly determined by measurement. Then, based on the ratio between the initial silicon capacity Qsi0 and the silicon capacity Qsi of the silicon-carbon battery under test under the current state, the degree of silicon capacity decay under the current state is determined. The corresponding calculation formula is expressed as: SOHsi=Qsi / Qsi0*100.

[0061] Once the silicon capacity decay rate (SOHsi) is confirmed, this embodiment can directly control the discharge cutoff voltage to mitigate the rise based on the silicon capacity decay rate (SOHsi), thereby mitigating silicon capacity decay.

[0062] It should be noted that this embodiment does not limit the execution order between the steps of determining the graphite capacity decay and the steps of determining the silicon capacity decay; they can be executed sequentially or in parallel.

[0063] To further improve the efficiency of charge and discharge management, in this embodiment, the steps of determining the degree of graphite capacity decay and the steps of determining the degree of silicon capacity decay can be executed in parallel.

[0064] For details, please refer to Figure 8 , Figure 8 A flowchart of another step of step 300 in an embodiment of the present invention is shown, wherein step 300 includes steps 301B to 304B.

[0065] Step 301B: Determine the rise limit value corresponding to the discharge cutoff voltage of the silicon-carbon battery under test based on the second preset rule; Step 302B: Determine the silicon capacity adjustment range based on the initial discharge cutoff voltage and the rise limit value; Step 303B: Obtain the silicon adjustment value based on the degree of silicon capacity decay and the silicon capacity adjustment range; Step 304B: Update the initial discharge cutoff voltage of the silicon-carbon battery under test based on the silicon adjustment value to obtain the updated discharge cutoff voltage of the silicon-carbon battery under test in the current state.

[0066] In this embodiment, the calculation formula for updating the initial discharge cutoff voltage of the silicon-carbon battery under test based on the silicon adjustment value is expressed as follows: ; In the formula, This represents the updated discharge cutoff voltage of the silicon-carbon battery under test in its current state. The initial discharge cutoff voltage of the silicon-carbon battery under test is denoted as . This refers to the degree of silicon capacity decay. This is the minimum range corresponding to the silicon adjustment range.

[0067] Similar to the previous embodiment, this embodiment does not limit the specific method of the second preset rule. In this embodiment, the second preset rule can be confirmed by the user based on the battery capacity and battery life requirements.

[0068] In one possible implementation, if it is necessary to ensure that the battery capacity retention rate of the silicon-carbon battery under test is greater than 80% during its life cycle, the rise limit value corresponding to the discharge cutoff voltage of the silicon-carbon battery under test in this embodiment is 3.25V.

[0069] Based on this, the silicon adjustment range corresponding to this embodiment is actually 0.25V (that is, the difference between the initial discharge cutoff voltage of 3.0V and the rise limit value of 3.25V).

[0070] Furthermore, to ensure that the degree of capacity decay of silicon and graphite remains balanced, the method for adjusting the discharge cutoff voltage in this embodiment can be the same as the method for adjusting the discharge cutoff voltage described above, that is, the same order of cyclic learning method can be used simultaneously.

[0071] In one possible implementation, taking the 5th-order cyclic learning method as an example, a 1% decrease in silicon capacity corresponds to a 50mV increase in the discharge cutoff voltage (i.e., 0.25V / 5=50mV), and 50mV is the minimum range corresponding to the silicon adjustment range.

[0072] This can be understood as follows: if the calculated silicon capacity decay rate is 1%, then the initial discharge cutoff voltage of 3.0V will be increased by 50mV; similarly, if the calculated silicon capacity decay rate is 5%, then the initial discharge cutoff voltage of 3.0V will be increased by 250mV.

[0073] In summary, the intelligent control algorithms for charging voltage drop management and discharging cut-off voltage rise management provided in this embodiment have the functions of real-time cumulative calculation of silicon capacity and capacity decay management, and real-time cumulative calculation of graphite capacity and capacity decay management. By managing the charging voltage and discharging cut-off voltage independently, the goal of mitigating capacity decay and extending battery life can be achieved.

[0074] The same idea applies as the previous embodiment; please refer to [the previous embodiment]. Figure 9 , Figure 9 A schematic diagram of a silicon-carbon battery charge-discharge management device 10 according to an embodiment of the present invention is shown. The silicon-carbon battery charge-discharge management device 10 includes: The capacity division module 11 is used to divide the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range.

[0075] In this embodiment, the capacity range of the silicon-carbon battery is used to characterize the full voltage range consisting of the discharge cutoff voltage and the full charge voltage. The lower limit voltage of the silicon capacity range is the initial discharge cutoff voltage of the silicon-carbon battery under test; the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test.

[0076] The degradation degree determination module 12 is used to determine the degree of silicon capacity degradation of the silicon-carbon battery under test in the silicon capacity range and to determine the degree of graphite capacity degradation of the silicon-carbon battery under test in the graphite capacity range. The battery charge / discharge adjustment module 13 is used to adjust the initial full charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay, and to adjust the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay.

[0077] In summary, this invention manages the capacity decay trend of silicon-carbon batteries by using the properties of silicon and graphite materials in different zones. This solves the technical problem of the difficulty in coordinating the capacity decay of silicon and graphite in silicon-carbon batteries, thereby effectively extending battery life and improving battery stability and efficiency.

[0078] Similar to the previous embodiment, the present invention also provides a computer-readable storage medium storing a computer program thereon. When the computer program is executed by a processor, it implements the silicon-carbon battery charge and discharge management method as described in any of the first aspects above, so as to solve the technical problem that it is difficult to coordinate the management of silicon capacity and graphite capacity decay in silicon-carbon batteries, thereby effectively extending battery life and improving battery stability and efficiency.

[0079] Following the same approach as the previous embodiment, the present invention also provides an electronic device, including a processor and a memory. The memory stores machine-executable instructions that can be executed by the processor. The processor can execute the machine-executable instructions to implement the silicon-carbon battery charge and discharge management method of any of the first aspects described above, so as to alleviate capacity decay and extend battery life.

[0080] In this embodiment, the memory is used to store programs or data. This memory can be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc.

[0081] In this embodiment, the processor is used to read / write data or programs stored in the memory and execute corresponding functions, namely, dividing the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range; determining the degree of graphite capacity decay and silicon capacity decay of the silicon-carbon battery under test in the current state; then adjusting the initial full charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay; and simultaneously adjusting the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay.

[0082] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0083] In addition, the functional modules in the various embodiments of the present invention can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0084] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this invention, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0085] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for managing the charging and discharging of a silicon-carbon battery, characterized in that, The silicon-carbon battery charge / discharge management method includes: The capacity range of the silicon-carbon battery under test is divided into a silicon capacity range and a graphite capacity range. The silicon-carbon battery capacity range is used to characterize the full voltage range consisting of the discharge cutoff voltage and the full charge voltage. The lower limit voltage of the silicon capacity range is the initial discharge cutoff voltage of the silicon-carbon battery under test, and the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test. Determine the degree of silicon capacity decay of the silicon-carbon battery under test in the silicon capacity range, and determine the degree of graphite capacity decay of the silicon-carbon battery under test in the graphite capacity range; The initial full charge voltage of the silicon-carbon battery under test is adjusted within the graphite capacity range based on the degree of graphite capacity decay, and the initial discharge cutoff voltage of the silicon-carbon battery under test is adjusted within the silicon capacity range based on the degree of silicon capacity decay.

2. The silicon-carbon battery charge and discharge management method according to claim 1, characterized in that, The step of dividing the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range includes: The initial discharge cutoff voltage and initial full charge voltage of the silicon-carbon battery under test are determined, and the partition voltage of the silicon-carbon battery under test is determined based on differential capacity analysis. The silicon capacity range is obtained by using the partition voltage as the upper limit voltage of the silicon capacity range and the initial discharge cutoff voltage as the lower limit voltage of the silicon capacity range; the graphite capacity range is obtained by using the partition voltage as the lower limit voltage of the graphite capacity range and the initial full charge voltage as the upper limit voltage of the graphite capacity range.

3. The silicon-carbon battery charge and discharge management method according to claim 2, characterized in that, The step of determining the partition voltage of the silicon-carbon battery under test based on differential capacity analysis includes: Determine the change in discharge voltage per unit time of the silicon-carbon battery under test during a preset discharge process; wherein, the preset discharge process is used to characterize the process of discharging the silicon-carbon battery under test in a fully charged state according to a preset current until a preset cutoff voltage is reached. Determine the capacity change value of the silicon-carbon battery under test per unit time during a preset discharge process; A differential voltage curve is generated based on the discharge voltage change value and the capacity change value, and the maximum value of the differential voltage curve is taken as the partition voltage of the silicon-carbon battery under test.

4. The silicon-carbon battery charge and discharge management method according to claim 1, characterized in that, The step of determining the degree of silicon capacity decay of the silicon-carbon battery under test in the silicon capacity range includes: determining the silicon capacity of the silicon-carbon battery under test in the silicon capacity range under the current state, and obtaining the degree of silicon capacity decay under the current state based on the ratio of the silicon capacity to the initial silicon capacity; And / or, the step of determining the degree of graphite capacity decay of the silicon-carbon battery under test in the graphite capacity range includes: determining the graphite capacity of the silicon-carbon battery under test in the graphite capacity range under the current state, and obtaining the degree of graphite capacity decay under the current state based on the ratio of the graphite capacity to the initial graphite capacity.

5. The silicon-carbon battery charge and discharge management method according to claim 1, characterized in that, The steps for adjusting the initial full-charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay include: The descent limit value corresponding to the full charge voltage of the silicon-carbon battery under test is determined based on the first preset rule; The graphite capacity adjustment range is determined based on the initial full charge voltage and the descent limit value. The graphite adjustment value is obtained based on the degree of graphite capacity decay and the graphite capacity adjustment range. The initial full charge voltage of the silicon-carbon battery under test is updated based on the graphite adjustment value to obtain the updated full charge voltage of the silicon-carbon battery under test in the current state.

6. The silicon-carbon battery charge and discharge management method according to claim 5, characterized in that, The formula for updating the initial full-charge voltage of the silicon-carbon battery under test based on the graphite adjustment value is expressed as follows: ； In the formula, The updated full-charge voltage of the silicon-carbon battery under test in its current state; The initial full charge voltage of the silicon-carbon battery under test; The degree of graphite capacity decay; This is the minimum range corresponding to the graphite adjustment range.

7. The silicon-carbon battery charge and discharge management method according to claim 1, characterized in that, The steps for adjusting the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay include: The rise limit value corresponding to the discharge cutoff voltage of the silicon-carbon battery under test is determined based on the second preset rule. The silicon capacity adjustment range is determined based on the initial discharge cutoff voltage and the rise limit value; The silicon adjustment value is obtained based on the degree of silicon capacity decay and the silicon capacity adjustment range; The initial discharge cutoff voltage of the silicon-carbon battery under test is updated based on the silicon adjustment value to obtain the updated discharge cutoff voltage of the silicon-carbon battery under test in the current state.

8. The silicon-carbon battery charge and discharge management method according to claim 7, characterized in that, The formula for updating the initial full-charge voltage of the silicon-carbon battery under test based on the silicon adjustment value is expressed as follows: ； In the formula, This represents the updated discharge cutoff voltage of the silicon-carbon battery under test in its current state. The initial discharge cutoff voltage of the silicon-carbon battery under test is denoted as . This refers to the degree of silicon capacity decay. This is the minimum range corresponding to the silicon adjustment range.

9. A silicon-carbon battery charge / discharge management device, characterized in that, include: The capacity division module is used to divide the capacity range of the silicon-carbon battery under test into a silicon capacity range and a graphite capacity range. The silicon-carbon battery capacity range is used to characterize the full voltage range consisting of the discharge cutoff voltage and the full charge voltage; wherein, the lower limit voltage of the silicon capacity range is the initial discharge cutoff voltage of the silicon-carbon battery under test; and the upper limit voltage of the graphite capacity range is the initial full charge voltage of the silicon-carbon battery under test. The degradation degree determination module is used to determine the degree of silicon capacity degradation of the silicon-carbon battery under test in the silicon capacity range and to determine the degree of graphite capacity degradation of the silicon-carbon battery under test in the graphite capacity range. The battery charge / discharge adjustment module is used to adjust the initial full charge voltage of the silicon-carbon battery under test within the graphite capacity range based on the degree of graphite capacity decay, and to adjust the initial discharge cutoff voltage of the silicon-carbon battery under test within the silicon capacity range based on the degree of silicon capacity decay.

10. An electronic device, characterized in that, The method includes a processor and a memory, the memory storing machine-executable instructions that can be executed by the processor, the processor executing the machine-executable instructions to implement the silicon-carbon battery charge and discharge management method according to any one of claims 1-8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the silicon-carbon battery charge and discharge management method as described in any one of claims 1-8.

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