Battery capacity recovery method, device, equipment, storage medium and program product

Abstract

The present invention discloses a battery capacity recovery method, device, equipment, storage medium and program product. The battery includes a silicon negative electrode lithium ion battery, and the negative electrode material of the silicon negative electrode lithium ion battery includes a silicon-based negative electrode material. The battery capacity recovery method includes: performing shallow charge and shallow discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and shallow discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material; monitoring the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and shallow discharge operations; when the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and shallow discharge operations is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery; during the full charge and discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material. The technical solution provided by the embodiment of the present invention effectively recovers the battery capacity.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery capacity recovery method, device, equipment, storage medium and program product. Background Art

[0002] Lithium-ion batteries are widely used in various portable electronic devices, electric vehicles and other fields due to their high energy density, long cycle life and low self-discharge rate. Among them, silicon-based negative electrode materials are considered to be ideal negative electrode materials for the next generation of lithium-ion batteries because of their high theoretical capacity.

[0003] However, silicon-based negative electrode materials will undergo huge volume changes during the charge and discharge process, resulting in damage to the electrode structure and loss of electrical contact, thus affecting the battery's cycle performance. In order to solve the expansion problem of silicon-based negative electrode materials, the prior art usually uses a method of mixing silicon-based negative electrode materials with graphite negative electrode materials to improve the battery's cycle performance. However, in actual use, users often use a shallow charge and discharge method. In the case of shallow charge and discharge, due to the problem of lithium deintercalation potential of silicon materials and graphite materials, lithium will continue to be intercalated in the silicon material in the shallow charge and discharge state, resulting in lithium ion accumulation and rapid capacity decay, making the battery's capacity decay problem even more serious. Summary of the invention

[0004] The present invention provides a battery capacity recovery method, device, equipment, storage medium and program product to effectively recover the battery capacity.

[0005] According to one aspect of the present invention, a battery capacity recovery method is provided, wherein the battery comprises a silicon negative electrode lithium ion battery, wherein the negative electrode material of the silicon negative electrode lithium ion battery is a silicon-based negative electrode material, comprising:

[0006] The silicon negative electrode lithium ion battery is subjected to a preset number of shallow charge and shallow discharge cycles; wherein, during the shallow charge and shallow discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material;

[0007] Monitoring the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations;

[0008] When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based negative electrode material.

[0009] Optionally, when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, performing a full charge and discharge operation on the silicon negative electrode lithium ion battery includes:

[0010] When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium ion battery is fully charged and discharged at a charge and discharge rate that is lower than the charge and discharge rate of the silicon negative electrode lithium ion battery during shallow charge and discharge operations.

[0011] Optionally, when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, performing a full charge and discharge operation on the silicon negative electrode lithium ion battery includes:

[0012] When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 80% and 90% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery.

[0013] Optionally, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than 100%.

[0014] Optionally, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than or equal to 30%.

[0015] Optionally, the lower limit of the discharge voltage is greater than or equal to 2.5V and less than or equal to 2.8V.

[0016] According to another aspect of the present invention, a battery capacity recovery device is provided, wherein the battery comprises a silicon negative electrode lithium ion battery, wherein the negative electrode material of the silicon negative electrode lithium ion battery comprises a silicon-based negative electrode material, including:

[0017] A shallow charge and discharge operation module, used for performing shallow charge and discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material;

[0018] A monitoring module, used to monitor the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations;

[0019] The full charge and discharge operation module is used to perform a full charge and discharge operation on the silicon negative electrode lithium ion battery when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, so as to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

[0020] According to another aspect of the present invention, there is provided an electronic device, comprising:

[0021] at least one processor; and

[0022] a memory communicatively connected to the at least one processor; wherein,

[0023] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute any of the battery capacity recovery methods described in the embodiments of the present invention.

[0024] According to another aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement any of the battery capacity recovery methods described in the embodiments of the present invention when executed.

[0025] According to another aspect of the present invention, a computer program product is provided. The computer program product comprises a computer program. When the computer program is executed by a processor, the battery capacity recovery method according to any of the embodiments of the present invention is implemented.

[0026] The battery capacity recovery method, device, equipment, storage medium and program product provided by the embodiment of the present invention, when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium ion battery is fully charged and discharged, and the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material, that is, during the full discharge operation, the silicon negative electrode lithium ion battery can completely deintercalate the lithium ions in the silicon-based negative electrode material, so that the lithium ions accumulated in the negative electrode material after the shallow charge and discharge operation are completely released back to the positive electrode, ensuring the energy density, safety and cycle stability of the battery, and having a high application value. Therefore, when the charging potential of the silicon negative electrode lithium ion battery is the upper limit of the charging voltage, that is, during the full charge operation of the silicon negative electrode lithium ion battery, the battery capacity can be restored to reach the rated capacity of the battery, thereby effectively restoring the battery capacity.

[0027] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 is a flow chart of a battery capacity recovery method provided by an embodiment of the present invention;

[0030] Figure 2 This is a cycle test curve of a silicon negative electrode lithium ion battery at different discharge depths provided by an embodiment of the present invention;

[0031] Figure 3 A curve of a silicon negative electrode lithium ion battery provided by an embodiment of the present invention, which is subjected to a shallow charge and shallow discharge operation cycle test after a preset number of shallow charge and shallow discharge cycles, a full charge and discharge operation, and then a shallow charge and shallow discharge operation cycle test;

[0032] Figure 4 is a structural schematic diagram of a battery capacity recovery device provided by an embodiment of the present invention;

[0033] Figure 5 The present invention is a schematic diagram of the structure of an electronic device of a battery capacity recovery device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] The battery in the embodiment of the present invention includes a silicon negative electrode lithium ion battery, and the negative electrode material of the silicon negative electrode lithium ion battery includes a silicon-based negative electrode material, and the silicon-based negative electrode material can be mixed with a graphite negative electrode material to improve its cycle performance. It should be noted that in other embodiments, the silicon-based negative electrode material can also be mixed with other negative electrode materials with good cycle performance to improve the cycle performance of the battery.

[0037] In actual use, users often adopt the method of shallow charging and shallow discharging. However, in the case of shallow charging and shallow discharging, the problem of battery capacity decay is more serious. After careful research, the inventor found that during the cycle of shallow charging and shallow discharging, the lithium ions in the silicon-based negative electrode material cannot be completely deintercalated, resulting in the inability to fully restore the battery capacity and accelerated capacity decay. The existing solution is usually to optimize the battery manufacturing process, but ignore the actual usage scenarios of users, which greatly reduces the effectiveness of the solution.

[0038] In order to effectively restore the battery capacity, the embodiment of the present invention provides the following technical solutions:

[0039] like Figure 1 As shown, Figure 1 This is a flow chart of a battery capacity recovery method provided by an embodiment of the present invention. This embodiment is applicable to application scenarios where the battery capacity decays after multiple shallow charge and discharge operations. The method can be performed by a battery capacity recovery device. The battery capacity recovery method of the battery capacity recovery device includes the following steps:

[0040] S110, performing shallow charge and shallow discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and shallow discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

[0041] The preset number of cycles for shallow charge and discharge of silicon negative electrode lithium-ion batteries can be about 200 times. Shallow charge and discharge operation refers to the state in which the battery is not fully charged or discharged during the charging and discharging process. This usage corresponds to the maximum capacity of the battery, that is, the maximum charge or discharge depth (Depth of discharge, DoD) of the battery is not reached. Among them, the depth of discharge is the percentage of the battery discharge amount to the rated capacity of the battery. For example, assuming that the total capacity of a battery is 50Ah, if only 20Ah-30Ah of the power is used each time, and charging is performed in time when the power is not completely exhausted, this usage is called "shallow charge and discharge". ‌

[0042] Shallow charging and discharging of the battery can reduce the chemical reaction pressure inside the battery, thereby extending the battery life.

[0043] Specifically, the positive electrode of the silicon negative electrode lithium-ion battery includes common positive electrode materials of lithium-ion batteries such as NCM, NCA, NCMA or LFP, and the negative electrode includes graphite doped with different proportions of silicon (silicon oxygen or silicon carbon): The specific reaction mechanism is as follows:

[0044] Lithium insertion: Li x Si y O2+Li x Si y (Li when inserted x Si y O2 reacts first)

[0045] Lithium removal: Li x Si y +Li x Si y O2 (Li during lithium removal x Si y Respond first)

[0046] During the lithium removal process, Li in graphite is removed first, followed by silicon. When the voltage reaches 3.0V, which is about 0.65V of the buckle voltage, SiO x The de-lithiation potential of Li is about 1.0V when the voltage reaches 2.5V. x Si y Therefore, there is a large amount of Si that has not been de-lithiated in the full-power range of 2.5-3.0V, and the capacity has not been released. This part of Li does not form a by-product, but exists in a reversible form and accumulates in the negative electrode.

[0047] The silicon-based material in the silicon-based negative electrode material includes silicon-oxygen material or silicon-carbon material.

[0048] In an embodiment of the present invention, during the preset number of shallow charge and shallow discharge operations on the silicon negative electrode lithium ion battery, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material, because the silicon-based material in the silicon-based negative electrode material cannot completely deintercalate lithium ions under the condition of shallow charge and shallow discharge, resulting in the inability to fully recover the capacity of the battery and accelerating the capacity decay. Exemplarily, the delithiation potential of Li in the silicon-based material is 3.0V. If the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than or equal to 3.0V, that is, after the silicon negative electrode lithium ion battery is subjected to shallow discharge operation, there is still a large amount of silicon-based material in the silicon-based negative electrode material that has not been delithiated, so that the capacity of the battery is not released.

[0049] like Figure 2 As shown, Figure 2 The figure is the cycle test curve of silicon negative electrode lithium-ion battery at different discharge depths. The cycle characteristics of battery A3-03 at a discharge depth of 100% are better than those of battery A3-03 at a discharge depth of 80%. When the discharge depth of battery A3-03 is 80%, the battery capacity decays faster when shallow charge and shallow discharge cycles are performed.

[0050] S120, monitoring the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations.

[0051] Among them, the battery management system (BMS) can be used to monitor the battery capacity of silicon negative electrode lithium-ion batteries during shallow charging and discharging operations.

[0052] S130. When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

[0053] It should be noted that in S110, the silicon negative electrode lithium-ion battery is shallowly charged and discharged. If the number of shallow charge and discharge operations does not reach the preset number of cycles, but the battery capacity of the silicon negative electrode lithium-ion battery during the shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium-ion battery can be fully charged and discharged to restore the battery capacity of the silicon negative electrode lithium-ion battery.

[0054] Among them, when the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, it means that the silicon-based material in the silicon-based negative electrode material cannot completely deintercalate lithium ions under shallow charge and discharge conditions, and the lithium ion content in the negative electrode material is too high, resulting in the battery capacity being unable to fully recover and the capacity decaying too quickly.

[0055] At this time, the silicon negative electrode lithium ion battery is fully charged and discharged. The lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material, that is, the silicon negative electrode lithium ion battery can completely deintercalate the lithium ions in the silicon-based material in the silicon-based negative electrode material during the full charge and discharge operation. Therefore, when the charging potential of the silicon negative electrode lithium ion battery is the upper limit of the charging voltage, the capacity of the battery can be restored to reach the rated capacity of the battery. Full charge and discharge operation refers to the state in which the battery is fully charged or discharged during the charging and discharging process. The upper limit of the charging voltage is 4.15V-4.4V for example.

[0056] Exemplarily, the delithiation potential of Li in the silicon-based material is 3.0V. If the lower limit of the discharge voltage of the silicon negative electrode lithium-ion battery is less than 3.0V, that is, after the silicon negative electrode lithium-ion battery is fully discharged, the lithium ions in the silicon-based negative electrode material can be completely deintercalated, so that when the charging potential of the silicon negative electrode lithium-ion battery is the upper limit of the charging voltage, the battery capacity can be restored to reach the rated capacity of the battery.

[0057] The technical solution provided by the embodiment of the present invention is to perform a full charge and discharge operation on the silicon negative electrode lithium ion battery when the battery capacity during the shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery. The lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material, that is, during the full discharge operation, the silicon negative electrode lithium ion battery can completely deintercalate the lithium ions in the silicon-based negative electrode material, so that the lithium ions accumulated in the negative electrode material after the shallow charge and discharge operation are completely released back to the positive electrode, ensuring the energy density, safety, and cycle stability of the battery, and having a high application value. Therefore, when the charging potential of the silicon negative electrode lithium ion battery is the upper limit of the charging voltage, that is, during the full charge operation of the silicon negative electrode lithium ion battery, the battery capacity can be restored to reach the rated capacity of the battery, thereby effectively restoring the battery capacity.

[0058] like Figure 3 As shown, Figure 3It is a curve of a silicon negative electrode lithium-ion battery that has undergone a preset number of shallow charge and shallow discharge cycles, then a full charge and discharge operation, and then a shallow charge and shallow discharge cycle test. As shown in curve L1, after 200 shallow charge and shallow discharge operations, the battery capacity decays. Then after a full charge and discharge operation, the battery capacity is restored to the capacity corresponding to point B. After that, a shallow charge and shallow discharge cycle test is performed again. As shown in curve L2, the battery capacity is effectively restored. Among them, the battery capacity corresponding to point A is the control battery capacity tested before the silicon negative electrode lithium-ion battery is not shallowly charged and discharged. Since the capacity corresponding to point B is not much different from the capacity corresponding to point A, it can be seen that after a full charge and discharge operation, the battery capacity is effectively restored. Among them, for shallow charge and shallow discharge operations, the upper limit of the charging voltage is 4.1V, and the lower limit of the discharge voltage is 3.0V (3.0 is greater than the delithiation potential of silicide in the negative electrode material). During full charge and discharge operations, the upper limit of the charging voltage is 4.2V and the lower limit of the discharging voltage is 2.5V (2.5V is lower than the delithiation potential of the silicide in the negative electrode material).

[0059] In summary, in the process of recycling batteries, the battery capacity is restored by performing shallow charge and discharge operations for a certain period of time, and then fully charging and discharging operations. This can not only obtain high energy density batteries while taking into account cycle stability, but also release the accumulated lithium ions of the negative electrode material, greatly improving the safety of the battery.

[0060] Optionally, based on the above technical solution, when the battery capacity of the S130 silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation of the silicon negative electrode lithium ion battery includes:

[0061] When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium ion battery is fully charged and discharged at a charge and discharge rate that is lower than the charge and discharge rate of the silicon negative electrode lithium ion battery during shallow charge and discharge operations.

[0062] Specifically, by reducing the charge and discharge speed of a full charge and discharge operation of a silicon negative electrode lithium ion battery, it is helpful to improve the degree of complete deintercalation of lithium ions in the silicon-based negative electrode material. Therefore, when the charging potential of the silicon negative electrode lithium ion battery is the upper limit of the charging voltage, the capacity of the battery can be restored, and it is easier to reach the rated capacity of the battery.

[0063] Preferably, based on the above technical solution, when the battery capacity of the S130 silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation of the silicon negative electrode lithium ion battery includes:

[0064] When the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations is between 80% and 90% of the rated capacity of the battery, the silicon negative electrode lithium-ion battery is fully charged and discharged.

[0065] Specifically, when the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations is between 80% and 90% of the rated capacity of the battery, that is, when the battery capacity decay is not too serious and there is a certain decay, the silicon negative electrode lithium-ion battery is fully charged and discharged once, which reduces the difficulty of battery capacity recovery and improves the efficiency of battery capacity recovery.

[0066] Optionally, based on the above technical solution, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than 100%.

[0067] Traditional lithium-ion batteries have reached their energy density limit and cannot meet the rapidly growing demand for long-range electric vehicles. Silicon-based anode materials include high-capacity (3592 mAh g –1 ) silicon material, which greatly improves the energy density of the battery. Specifically, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is too small, so that it is less than 0.5%. The mass content of silicon is too low, and there is no significant effect on the improvement of the energy density of the battery. The ratio of the mass of silicon to the mass of the silicon-based negative electrode material is too large, reaching 100%, which will cause the battery to have expansion problems after multiple cycles. Therefore, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5%, and less than 100%, which can improve the energy density of the battery and improve the expansion problem of the battery after multiple cycles.

[0068] Optionally, based on the above technical solution, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than or equal to 30%, which can further improve the expansion problem of the battery after multiple cycles.

[0069] Optionally, based on the above technical solution, the lower limit of the discharge voltage is greater than or equal to 2.5V and less than or equal to 2.8V.

[0070] Specifically, the delithiation potential of silicon-based materials (SiOx) is 3.0V. Therefore, the lower limit of the discharge voltage is set within the range of greater than or equal to 2.5V and less than or equal to 2.8V. When the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium-ion battery is fully charged and discharged. The lower limit of the discharge voltage of the silicon negative electrode lithium-ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material, that is, the silicon negative electrode lithium-ion battery can completely deintercalate the lithium ions in the silicon-based material in the silicon-based negative electrode material during the full charge and discharge operation. Therefore, when the charging potential of the silicon negative electrode lithium-ion battery is the upper limit of the charging voltage, the battery capacity can be restored to reach the rated capacity of the battery, thereby effectively restoring the battery capacity.

[0071] Based on the same inventive concept, the embodiment of the present invention also provides a battery capacity recovery device, such as Figure 4 As shown, Figure 4 1 is a schematic diagram of a battery capacity recovery device provided by an embodiment of the present invention, the battery capacity recovery device comprising:

[0072] The shallow charge and discharge operation module 210 is used to perform shallow charge and discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

[0073] The monitoring module 220 is used to monitor the battery capacity of the silicon negative electrode lithium-ion battery during the shallow charge and discharge operation.

[0074] The full charge and discharge operation module 230 is used to perform a full charge and discharge operation on the silicon negative electrode lithium ion battery when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, so as to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

[0075] Optionally, the full charge and discharge operation module 230 is also used for when the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, and a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery, including:

[0076] When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium ion battery is fully charged and discharged at a charge and discharge rate that is lower than the charge and discharge rate of the silicon negative electrode lithium ion battery during shallow charge and discharge operations.

[0077] Optionally, the full charge and discharge operation module 230 is also used for when the battery capacity of the silicon negative electrode lithium ion battery during the shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, and a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery, including:

[0078] When the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations is between 80% and 90% of the rated capacity of the battery, the silicon negative electrode lithium-ion battery is fully charged and discharged.

[0079] Optionally, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than 100%.

[0080] Optionally, in the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than or equal to 30%.

[0081] Optionally, the lower limit of the discharge voltage is greater than or equal to 2.5V and less than or equal to 2.8V.

[0082] The battery capacity recovery device provided in the embodiment of the present invention can execute the battery capacity recovery method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of the execution method.

[0083] Figure 5 A schematic diagram of the structure of an electronic device 300 that can be used to implement a battery capacity recovery device of an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or required herein.

[0084] like Figure 5As shown, the electronic device 300 of the battery capacity recovery device includes at least one processor 11, and a memory connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc., wherein the memory stores a computer program that can be executed by at least one processor, and the processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 to the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the electronic device 300 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other through the bus 14. The input / output (I / O) interface 15 is also connected to the bus 14.

[0085] A plurality of components in the electronic device 300 of the battery capacity recovery device are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disk, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the electronic device 300 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0086] The processor 11 may be a variety of general and / or special processing components with processing and computing capabilities. Some examples of the processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as a battery capacity recovery method.

[0087] In some embodiments, the battery capacity recovery method may be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as a storage unit 18. In some embodiments, part or all of the computer program may be loaded and / or installed on the electronic device 300 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the battery capacity recovery method described above may be performed. Alternatively, in other embodiments, the processor 11 may be configured to perform the battery capacity recovery method in any other appropriate manner (e.g., by means of firmware).

[0088] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chips (SOCs), load programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include: being implemented in one or more computer programs, which may be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general programmable processor, which may receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0089] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, so that when the computer program is executed by the processor, the functions / operations specified in the flow chart and / or block diagram are implemented. The computer program may be executed entirely on the machine, partially on the machine, partially on the machine and partially on a remote machine as a stand-alone software package, or entirely on a remote machine or server.

[0090] In the context of the present invention, a computer-readable storage medium may be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, device, or equipment. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or equipment, or any suitable combination of the foregoing. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. A more specific example of a machine-readable storage medium may include an electrical connection based on one or more lines, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0091] To provide interaction with a user, the systems and techniques described herein may be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices may also be used to provide interaction with the user; for example, the feedback provided to the user may be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user may be received in any form (including acoustic input, voice input, or tactile input).

[0092] The systems and techniques described herein may be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer with a graphical user interface or a web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system may be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0093] A computing system may include a client and a server. The client and the server are generally remote from each other and usually interact through a communication network. The client and server relationship is generated by computer programs running on the corresponding computers and having a client-server relationship with each other. The server may be a cloud server, also known as a cloud computing server or cloud host, which is a host product in the cloud computing service system to solve the defects of difficult management and weak business scalability in traditional physical hosts and VPS services.

[0094] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements a battery capacity recovery method as provided in any embodiment of the present invention.

[0095] In the process of implementation, the computer program product can be written in one or more programming languages ​​or a combination thereof to perform the computer program code of the present invention, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (for example, using an Internet service provider to connect through the Internet).

[0096] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0097] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery capacity recovery method, wherein the battery comprises a silicon negative electrode lithium ion battery, wherein the negative electrode material of the silicon negative electrode lithium ion battery comprises a silicon-based negative electrode material, characterized in that: include: The silicon negative electrode lithium ion battery is subjected to a preset number of shallow charge and shallow discharge cycles; wherein, during the shallow charge and shallow discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material; Monitoring the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations; When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

2. The battery capacity recovery method according to claim 1, characterized in that: When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation of the silicon negative electrode lithium ion battery includes: When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 75% and 95% of the rated capacity of the battery, the silicon negative electrode lithium ion battery is fully charged and discharged at a charge and discharge rate that is lower than the charge and discharge rate of the silicon negative electrode lithium ion battery during shallow charge and discharge operations.

3. The battery capacity recovery method according to claim 1, characterized in that: When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, a full charge and discharge operation of the silicon negative electrode lithium ion battery includes: When the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operations is between 80% and 90% of the rated capacity of the battery, a full charge and discharge operation is performed on the silicon negative electrode lithium ion battery.

4. The battery capacity recovery method according to claim 1, characterized in that: In the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than 100%.

5. The battery capacity recovery method according to claim 4, characterized in that: In the silicon-based negative electrode material, the ratio of the mass of silicon to the mass of the silicon-based negative electrode material is greater than or equal to 0.5% and less than or equal to 30%.

6. The battery capacity recovery method according to claim 1, characterized in that: The lower limit of the discharge voltage is greater than or equal to 2.5V and less than or equal to 2.8V.

7. A battery capacity recovery device, the battery comprising a silicon negative electrode lithium ion battery, the negative electrode material of the silicon negative electrode lithium ion battery comprising a silicon-based negative electrode material, characterized in that: include: A shallow charge and discharge operation module, used for performing shallow charge and discharge operations on the silicon negative electrode lithium ion battery for a preset number of cycles; wherein, during the shallow charge and discharge operations, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is greater than the delithiation potential of the silicon-based material in the silicon-based negative electrode material; A monitoring module, used to monitor the battery capacity of the silicon negative electrode lithium-ion battery during shallow charge and discharge operations; The full charge and discharge operation module is used to perform a full charge and discharge operation on the silicon negative electrode lithium ion battery when the battery capacity of the silicon negative electrode lithium ion battery during shallow charge and discharge operation is between 75% and 95% of the rated capacity of the battery, so as to restore the battery capacity of the silicon negative electrode lithium ion battery; wherein, during the full charge and discharge operation, the lower limit of the discharge voltage of the silicon negative electrode lithium ion battery is less than the delithiation potential of the silicon-based material in the silicon-based negative electrode material.

8. An electronic device, characterized in that: include: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the battery capacity recovery method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a processor to implement the battery capacity recovery method according to any one of claims 1 to 6 when executed.

10. A computer program product, characterized in that The computer program product comprises a computer program, which, when executed by a processor, implements the battery capacity recovery method according to any one of claims 1 to 6.

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