Charging control method and battery device

Abstract

The embodiment of the invention provides a charging control method and a battery device. The purpose of reducing overcharge of the battery device can be achieved without control of a main control module. The charging control method comprises the steps that under the condition that a battery device is in a charging state, a target chip collects a first voltage of at least one battery monomer in the battery device, the battery device comprises the target chip, the target chip comprises a first pin, and an overvoltage fault setting function of the first pin is in a starting state; and when the first voltage is greater than or equal to a first voltage threshold value, the target chip cuts off a charging loop of the battery device.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a charging control method and a battery device. Background Art

[0002] With the promotion and application of new energy sources such as solar energy and wind energy, energy storage technology has developed accordingly. Among them, the overcharging problem of battery devices in energy storage systems is an important factor related to the development of energy storage technology.

[0003] Overcharging usually leads to performance degradation, life reduction and even thermal runaway of battery devices, which in turn causes huge personal and property losses. Therefore, how to effectively solve the overcharging problem of battery devices is an urgent problem to be solved. Summary of the invention

[0004] The embodiments of the present application provide a charging control method and a battery device, which can achieve the purpose of reducing overcharging of the battery device without the control of a main control module.

[0005] In a first aspect, a charging control method is provided, the method comprising: when a battery device is in a charging state, a target chip collects a first voltage of at least one battery cell in the battery device, the battery device includes the target chip, the target chip includes a first pin, and an overvoltage fault setting function of the first pin is in an on state; when the first voltage is greater than or equal to a first voltage threshold, the target chip cuts off the charging circuit of the battery device.

[0006] In the embodiment of the present application, when the battery device is in a charging state, the voltage of the battery cell in the battery device is collected by the target chip included in the battery device, and when the battery device is overcharged, the target chip cuts off the charging circuit of the battery device. In this way, the purpose of reducing the overcharging of the battery device can be achieved without the control of the main control module, which not only reduces the probability of safety hazards caused by overcharging of the battery device, but also increases the applicability of the battery device, such as being applicable to single-pack charging conditions. In addition, the target chip itself can perform voltage collection, voltage comparison and charging circuit cutting without adding additional circuits, such as comparison circuits, effectively reducing the cost of overcharging protection. Furthermore, when the battery device is in a charging state, the overvoltage fault setting function of the first pin in the target chip is in an on state, which can further reduce the probability of safety hazards caused by overcharging of the battery device.

[0007] In some possible implementations, the target chip cuts off a charging circuit of the battery device, including: a first pin of the target chip outputs a first signal, where the first signal is used to cut off the charging circuit.

[0008] According to the technical solution, when the battery device is overcharged, the first pin outputs a first signal for cutting off the charging circuit, thereby effectively reducing the probability of a series of adverse effects caused by the overcharging of the battery device.

[0009] In some possible implementations, the battery device further includes a switching device, which is connected to the first pin and a plurality of battery cells, the plurality of battery cells including the at least one battery cell, and the target chip cuts off the charging circuit of the battery device, comprising: the first pin of the target chip drives the switching device so that the switching device cuts off the charging circuit.

[0010] This technical solution provides a switch device connected to the first pin in the battery device. In this way, when the battery device is overcharged, the first pin can drive the switch device, and the switch device can quickly and timely cut off the charging circuit, thereby improving the success rate of switching the charging circuit, further reducing the probability of a series of adverse effects caused by overcharging of the battery device, and improving the performance of the battery device.

[0011] In some possible implementations, the on-off device includes a switch tube and a on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative electrodes of the multiple battery cells, and the two ends of the on-off sub-device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells; wherein the first pin is used to drive the switch tube to turn on so that the switch tube outputs a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

[0012] Through the above-mentioned configuration, when the battery device is overcharged, the probability of cutting off the charging circuit can be effectively increased, thereby improving the performance of overcharge protection of the battery device.

[0013] In some possible implementations, the on-off sub-device includes a triggering device and a fuse, wherein two ends of the triggering device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells, and the fuse is connected to the negative electrodes of the multiple battery cells; wherein the driving voltage is used to drive the triggering device, and when the triggering device is started, the triggering device triggers the fuse to melt, thereby cutting off the charging circuit.

[0014] This technical solution, by configuring the on-off sub-device to include a triggering device and a fuse, can further increase the probability of cutting off the charging circuit when the battery device is overcharged, thereby improving the performance of overcharge protection for the battery device.

[0015] In some possible implementations, one end of the on-off device is connected to the negative electrode of the first battery cell among the multiple battery cells, and the other end of the on-off device is connected to the positive electrode of the mth battery cell among the multiple battery cells, where m is determined based on the driving capacity required by the on-off device.

[0016] Normally, the ground terminal of the target chip is usually connected to the negative electrode of the first battery cell among multiple battery cells. In the above technical scheme, one end of the on-off device is also connected to the negative electrode of the first battery cell among the multiple battery cells, that is, the target chip and the on-off device share a common ground, which makes it easy for the target chip to determine whether the battery device is overcharged, and can effectively improve the efficiency of the target chip in overcharge protection, thereby improving the performance of the battery device.

[0017] In some possible implementations, the method further includes: the target chip collects the second voltage of the at least one battery cell in a first collection cycle; when the second voltage is greater than or equal to a second voltage threshold, the target chip determines that the battery device is in a charging state; the target chip collects the first voltage of the at least one battery cell, including: the target chip collects the first voltage in a second collection cycle; wherein the first collection cycle is greater than the second collection cycle.

[0018] This technical solution sets the second acquisition cycle to be smaller than the first acquisition cycle, that is, after determining that the battery device is in a charging state, the target chip acquires the second voltage at a relatively fast acquisition frequency, so that the voltage of the battery cell can be quickly detected. In this way, after the battery device is overcharged, the target chip can determine that the battery device has been overcharged in a relatively short time, and then can quickly cut off the charging circuit, reducing the possibility of a series of adverse effects caused by overcharging of the battery device.

[0019] In a second aspect, a battery device is provided, comprising: a plurality of battery cells; a target chip connected to the plurality of battery cells, the target chip comprising a first pin, and when the battery device is in a charging state, an overvoltage fault setting function of the first pin is in an on state; wherein the target chip is used to collect a first voltage of at least one battery cell among the plurality of battery cells when the battery device is in a charging state, and to cut off the charging circuit of the battery device when the first voltage is greater than or equal to a first voltage threshold.

[0020] In some possible implementations, when the first voltage is greater than or equal to the first voltage threshold, the first pin is used to output a first signal, and the first signal is used to cut off the charging circuit.

[0021] In some possible implementations, the battery device further includes: a switching device connected to the target chip and the plurality of battery cells; wherein the first pin is used to drive the switching device so that the switching device cuts off the charging circuit.

[0022] In some possible implementations, the on-off device includes a switch tube and a on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative electrodes of the multiple battery cells, and the two ends of the on-off sub-device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells; wherein the first pin is used to drive the switch tube to conduct to output a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

[0023] In some possible implementations, the on-off sub-device includes a triggering device and a fuse, wherein two ends of the triggering device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells, and the fuse is connected to the negative electrodes of the multiple battery cells; wherein the driving voltage is used to drive the triggering device, and when the triggering device is started, the triggering device triggers the fuse to melt, thereby cutting off the charging circuit.

[0024] In some possible implementations, one end of the on-off device is connected to the negative electrode of the first battery cell among the multiple battery cells, and the other end of the on-off device is connected to the positive electrode of the Nth battery cell among the multiple battery cells, where N is determined based on the driving capability required by the on-off device.

[0025] In some possible implementations, the target chip is also used to collect the second voltage of the at least one battery cell in a first collection cycle, and when the second voltage is greater than a second voltage threshold, the target chip determines that the battery device is in a charging state; the target chip is specifically used to collect the second voltage in a second collection cycle, and the first collection cycle is greater than the second collection cycle.

[0026] In some possible implementations, the target chip is an analog front-end chip.

[0027] In a third aspect, an energy storage device is provided, comprising the battery device in the second aspect or any implementation thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic flow chart of a charging control method according to an embodiment of the present application is shown.

[0029] Figure 2A schematic diagram of a battery device according to an embodiment of the present application is shown.

[0030] Figure 3 A schematic diagram of another battery device according to an embodiment of the present application is shown.

[0031] Figure 4 A schematic diagram of yet another battery device according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0034] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0036] The term "multiple" as used in the present application refers to more than two (including two). Similarly, the term "multiple groups" refers to more than two groups (including two groups), and the term "multiple sheets" refers to more than two sheets (including two sheets).

[0037] With the promotion and application of new energy sources such as solar energy and wind energy, energy storage technology has developed accordingly. An energy storage system may include one or more battery devices. The battery device mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in the present application may include a battery module or a battery pack.

[0038] During the use of the battery device, the battery device needs to be charged. However, when charging the battery device, the problem of overcharging may occur. Battery overcharging means that during the charging process of the battery device, due to the charging time being too long or the charging voltage being too high, the charging reaction inside the battery device continues, thus exceeding the normal charging state designed for the battery device.

[0039] Overcharging of a battery device may cause a series of problems. On the one hand, it may reduce the life of the battery device. Specifically, overcharging will accelerate the internal chemical reaction of the battery device, resulting in physical and chemical changes in the internal structure of the battery device, thereby accelerating the aging process of the battery device. In addition, overcharging will reduce the number of cycles of the battery device, that is, the number of times the battery device can be charged and discharged will be reduced, thereby shortening the overall service life of the battery device. On the other hand, overcharging will cause the loss of active substances inside the battery device, thereby reducing the capacity of the battery device and weakening the battery device's endurance. In addition, overcharging will increase the internal resistance of the battery device, reduce the energy conversion efficiency of the battery device, and reduce the energy released by the battery device during the discharge process. On the other hand, overcharging may also cause safety hazards. For example, overcharging will generate a large amount of heat. If the heat cannot be dissipated in time, it will cause the temperature of the battery device to rise sharply, which will cause serious safety problems such as smoke, fire, and even explosion. For another example, overcharging will also cause the gas pressure inside the battery device to expand, causing the outer shell of the battery device to expand, which may cause leakage in severe cases, causing damage to the environment and equipment.

[0040] At present, in energy storage systems, during the charging process of a battery device, if the battery device is overcharged, the main control module, such as the slave battery management unit (SBMU), will drive the fuse to perform fuse protection. However, if there is only one battery device, there may be no main control module, and in this case, the battery device cannot be protected from overcharge.

[0041] In view of this, an embodiment of the present application provides a method for charging control, in which, when the battery device is in a charging state, the target chip collects the first voltage of at least one battery cell in the battery device, and when the first voltage is greater than or equal to the first voltage threshold, the target chip cuts off the charging circuit of the battery device. Wherein, the battery device includes a target chip. When the battery device is in a charging state, the voltage of the battery cell in the battery device is collected by the target chip included in the battery device, and when the battery device is overcharged, the target chip cuts off the charging circuit of the battery device. In this way, the purpose of reducing the overcharging of the battery device can be achieved without the control of the main control module, which not only reduces the probability of safety hazards caused by overcharging of the battery device, but also increases the applicability of the battery device, such as being applicable to single-pack charging conditions. In addition, the target chip itself can perform voltage collection, voltage comparison and charging circuit cutting without adding additional circuits, such as comparison circuits, which effectively reduces the cost of overcharging protection.

[0042] The embodiments of the present application can be applied to energy storage systems, for example. Energy storage systems are devices or systems that can store energy and release it when needed. In the field of new energy, energy storage systems generally refer to devices that can store electrical energy and release it during peak hours of electricity consumption. Energy storage systems play a variety of roles in power systems, including load balancing, frequency regulation, backup power, peak and valley electricity price management, and improving grid stability. With the rapid development of renewable energy, the importance of energy storage systems is increasing.

[0043] Electrochemical energy storage represented by lithium-ion batteries is the energy storage technology with the highest proportion. The electrochemical energy storage system consists of battery devices, battery management systems (BMS), energy management systems (EMS), power conversion systems (PCS) and auxiliary equipment.

[0044] Among them, the battery device is the energy storage medium in the energy storage system, responsible for storing and releasing electrical energy. BMS is used to monitor and manage the status of the battery device, including charging status, voltage, temperature and current, to ensure that the battery device operates within a safe operating range, prevent over-discharge, overheating and short circuit, etc., thereby extending the life of the battery device. EMS is the control center of the energy storage system, responsible for monitoring the operating status of the entire system, optimizing energy storage and release strategies to meet grid demand or user-set goals. PCS is mainly used to control the conversion and flow of electrical energy in the energy storage system, that is, converting DC in the energy storage system into AC to meet the needs of the grid or load. At the same time, PCS can also convert AC to DC to charge the battery devices in the energy storage system.

[0045] The energy storage system includes an energy storage device, which includes a battery device. The energy storage device can be an energy storage device of various types and sizes. Exemplarily, the energy storage device can be an energy storage container or an energy storage cabinet.

[0046] Figure 1 A schematic flow chart of a charging control method 100 according to an embodiment of the present application is shown. The method 100 may include at least part of the following contents.

[0047] S110: When the battery device is in a charging state, the target chip collects a first voltage of at least one battery cell in the battery device, the battery device including the target chip.

[0048] S120: When the first voltage is greater than or equal to a first voltage threshold, the target chip cuts off the charging circuit of the battery device.

[0049] In the embodiment of the present application, when the battery device is in a charging state, the voltage of the battery cells in the battery device is collected by the target chip included in the battery device, and when the battery device is overcharged, the target chip cuts off the charging circuit of the battery device. In this way, the purpose of reducing the overcharge of the battery device can be achieved without the control of the main control module, which not only reduces the probability of safety hazards caused by overcharging of the battery device, but also increases the applicability of the battery device, such as being applicable to single-pack charging conditions. In addition, the target chip itself can perform voltage collection, voltage comparison and charging circuit cutting without adding additional circuits, such as comparison circuits, which effectively reduces the cost of overcharge protection.

[0050] The target chip may be a newly added chip in the battery device or a chip that already exists in the battery device. For example, the target chip may be an analog front-end (AFE) chip. In this way, the overcharge protection of the battery device can be achieved by reusing the AFE chip in the battery device, which can effectively reduce the cost of overcharge protection.

[0051] The battery device may include a plurality of battery cells, the plurality of battery cells may be connected in series, and the plurality of battery cells include at least one battery cell. The first voltage of the at least one battery cell acquired by the target chip is the voltage of each battery cell in the at least one battery cell.

[0052] The first voltage being greater than or equal to the first voltage threshold indicates that the battery device is about to be in an overcharged state or has been in an overcharged state. The first voltage threshold is not limited in the present embodiment of the application, and the first voltage threshold can be specifically set based on specific circumstances.

[0053] After the target chip collects the first voltage, the target chip can determine whether the first voltage is greater than or equal to a first voltage threshold. If it is determined that the first voltage is greater than or equal to the first voltage threshold, the target chip can cut off the charging circuit of the battery device.

[0054] In some embodiments, the method 100 may further include: the target chip collects a second voltage of at least one battery cell in a first collection cycle, and when the second voltage is greater than or equal to a second voltage threshold, the target chip determines that the battery device is in a charging state.

[0055] At this time, S110 may specifically include: the target chip collects the first voltage in a second collection period.

[0056] The second voltage threshold value in the embodiment of the present application is not specifically limited. For example, the second voltage threshold value can be determined according to parameters such as the type of the battery device and the environment in which the battery device is located. The second voltage threshold value is intended to indicate that the battery device is in a charging state. For example, if the battery device is a lithium iron phosphate battery, in a non-charging state, the voltage of the lithium iron phosphate battery is usually between 3.2 volts (V) and 3.6V. In a charging state, due to the influence of some factors, the voltage of the lithium iron phosphate battery will be higher than the voltage in a non-charging state. Therefore, the second voltage threshold value can be 3.7V.

[0057] The first acquisition period may be the same as the second acquisition period, for example, the first acquisition period and the second acquisition period are both 5 seconds (s), 10 seconds, etc.

[0058] Alternatively, the first acquisition cycle may be different from the second acquisition cycle. For example, the first acquisition cycle is greater than the second acquisition cycle. In this technical solution, the second acquisition cycle is set to be less than the first acquisition cycle, that is, after determining that the battery device is in a charging state, the target chip acquires the second voltage at a relatively fast acquisition frequency, so that the voltage of the battery cell can be quickly detected. In this way, after the battery device is overcharged, the target chip can determine that the battery device has been overcharged in a relatively short time, and then can quickly cut off the charging circuit, reducing the possibility of a series of adverse effects caused by overcharging of the battery device.

[0059] For example, the first acquisition period may be 30 seconds, and the second acquisition period may be 100 milliseconds (ms).

[0060] The target chip may include multiple modes. Optionally, the target chip may respectively collect the first voltage and the second voltage in the same mode.

[0061] Optionally, the target chip may collect the first voltage and the second voltage in different modes. For example, the target chip may collect the first voltage in a sleep mode, and the target chip may collect the second voltage in an active mode.

[0062] In some embodiments, the target chip may include a first pin, and when the battery device is in a charging state, an overvoltage fault setting function of the first pin is in an on state, so as to further reduce the probability of potential safety hazards caused by overcharging of the battery device.

[0063] In other words, the embodiment of the present application can add configurable functions to all fault bits mapped to the first pin, and when the battery device is in a charging state, only the overvoltage fault setting function is enabled.

[0064] Among them, the first pin is used to indicate the fault status of the battery device, which may include but is not limited to overvoltage, undervoltage, overcurrent, overtemperature, sleep clock, system clock low frequency, balancing switch error, communication frame error, timeout, etc.

[0065] The first pin may be, for example, a fault pin or a general purpose input / output (GPIO) pin.

[0066] It should be noted that when the battery device is not in a charging state, the target chip can configure the first pin's undervoltage, overcurrent, overtemperature, sleep clock, system clock low frequency, balancing switch error, communication frame error, timeout and other fault functions based on system requirements.

[0067] In some embodiments, S120 may specifically include: a first pin of the target chip outputs a first signal, where the first signal is used to cut off the charging circuit.

[0068] According to the technical solution, when the battery device is overcharged, the first pin can output a first signal for cutting off the charging circuit, thereby effectively reducing the probability of a series of adverse effects caused by the overcharging of the battery device.

[0069] The first signal may be, for example, a high level, which is used to indicate that the battery device is overcharged so as to cut off the charging circuit. The first signal may also be a low level, which is used to indicate that the battery device is overcharged.

[0070] In some embodiments, Figure 2 As shown, the battery device may further include a switch device, which is connected to the first pin and the plurality of battery cells. At this time, S120 may specifically include: the first pin of the target chip is used to drive the switch device, so that the switch device cuts off the charging circuit.

[0071] This technical solution provides a switch device connected to the first pin in the battery device. In this way, when the battery device is overcharged, the first pin can drive the switch device, and the switch device can quickly and timely cut off the charging circuit, thereby improving the success rate of switching the charging circuit, further reducing the probability of a series of adverse effects caused by overcharging of the battery device, and improving the performance of the battery device.

[0072] The switching device may include, but is not limited to, a fuse, a relay, a switch tube, etc.

[0073] The first pin driving on-off device may include a first signal driving on-off device.

[0074] Furthermore, the on-off device may include a switch tube and an on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative pole of multiple battery cells, and the two ends of the on-off sub-device are respectively connected to the third section of the switch tube and the positive poles of multiple battery cells.

[0075] The first pin is used to drive the switch tube to conduct, so that the switch tube outputs a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

[0076] Through the above-mentioned configuration, when the battery device is overcharged, the probability of cutting off the charging circuit can be effectively increased, thereby improving the performance of overcharge protection of the battery device.

[0077] The switch tube may be, for example, a metal-oxide-semiconductor field-effect transistor (MOSFET), an insulated-gate bipolar transistor (IGBT), a switch triode, etc. Of course, the on-off device may also include a relay and an on-off sub-device.

[0078] Exemplarily, when the switch tube includes a MOSFET, the gate of the MOSFET may be connected to the first pin, the drain of the MOSFET may be connected to the negative electrodes of the plurality of battery cells, and the source of the MOSFET may be connected to the on-off sub-device.

[0079] It should be noted that, in a fault-free state, such as when the battery device is not overcharged, the leakage current of the switch tube is small, such as less than 1 milliampere (mA). In this way, the possibility of the switch tube over-consuming the energy of the battery cell connected thereto can be reduced, thereby reducing the probability of imbalance between multiple battery cells.

[0080] The on-off sub-device may be an active fuse. The on-off sub-device may include a fuse. In this case, the driving voltage output by the switch tube may drive the fuse to melt, thereby cutting off the charging circuit.

[0081] Alternatively, the switching sub-device may include other devices in addition to the fuse. Figure 3 As shown, the switching sub-device may include a triggering device SQ1 and a fuse F2, wherein two ends of the triggering device are respectively connected to the third end of the switch tube and the positive electrodes of multiple battery cells, and the fuse is connected to the negative electrodes of multiple battery cells.

[0082] At this time, the driving voltage is used to drive the triggering device. When the triggering device is started, the triggering device triggers the fuse to melt, thereby cutting off the charging circuit.

[0083] This technical solution, by configuring the on-off sub-device to include a triggering device and a fuse, can further increase the probability of cutting off the charging circuit when the battery device is overcharged, thereby improving the performance of overcharge protection for the battery device.

[0084] Optionally, the initiation means may comprise an explosion squib.

[0085] As an example, after the target chip determines that the battery device is overcharged, the first pin outputs a first signal, which drives the switch tube to turn on. After the switch tube is turned on, it outputs a driving voltage to drive the explosives in the explosion fuse to explode, blow the fuse, and thus cut off the charging circuit.

[0086] It should be understood that the overcurrent capacity of the fuse needs to meet the charging and discharging requirements of the system.

[0087] When the on-off device is connected to a battery cell, one end of the on-off device can be connected to the negative electrode of any one of the multiple battery cells, and the other end of the on-off device can be connected to the positive electrode of the mth battery cell among the multiple battery cells, where m is determined based on the driving capacity required by the on-off device.

[0088] Alternatively, m may be determined based on a starting voltage of the switching device.

[0089] For example, the battery device is a lithium iron phosphate battery, the on-off device includes a switch tube, a triggering device and a fuse, the battery device includes N battery cells, the second end of the switch tube is connected to the negative electrode of the second battery cell among the N battery cells, the starting voltage of the triggering device is 6V, and one end of the triggering device is connected to the positive electrode of the fourth battery cell among the N battery cells.

[0090] For another example, the battery device is still a lithium iron phosphate battery, the on-off device includes a switch tube, a triggering device and a fuse, the battery device includes N battery cells, the second end of the switch tube is connected to the negative electrode of the fifth battery cell among the N battery cells, the starting voltage of the triggering device is 9V, and one end of the triggering device is connected to the positive electrode of the seventh battery cell among the N battery cells.

[0091] Typically, the ground terminal of the target chip is usually connected to the negative electrode of the first battery cell among the multiple battery cells, in order to share the ground with the target chip, so that the target chip can determine whether the battery device is overcharged. Figure 3 In some embodiments, one end of the switch device may be connected to the negative electrode of the first battery cell among the plurality of battery cells.

[0092] That is, the target chip and the switching device share a common ground, which makes it easy for the target chip to determine whether the battery device is overcharged, and can effectively improve the efficiency of the target chip in overcharge protection, thereby improving the performance of the battery device.

[0093] For example, the on-off device includes a switching tube, a triggering device and a fuse. The second end of the switching tube is connected to the negative electrode of the first battery cell among the multiple battery cells, the third end of the switching tube is connected to one end of the triggering device, the other end of the triggering device is connected to the positive electrode of the mth battery cell, one end of the fuse is also connected to the negative electrode of the first battery cell, and the other end of the fuse can be connected to the negative electrode of the battery device, an external load or a charging pile.

[0094] In the embodiments of the present application, the sequence numbers of the above processes do not mean the order of execution. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0095] Furthermore, under the premise of no conflict, the various embodiments and / or the technical features in the various embodiments described in the present application may be arbitrarily combined with each other, and the technical solutions obtained after the combination shall also fall within the protection scope of the present application.

[0096] The above describes in detail the charging control method of the embodiment of the present application, and the battery device of the embodiment of the present application will be described below. It should be understood that the charging control method in the embodiment of the present application can be applied to the battery device of the embodiment of the present application.

[0097] like Figure 4As shown, the battery device 200 includes: a plurality of battery cells 210; a target chip 220, which is connected to the plurality of battery cells 210, and the target chip 220 includes a first pin, and when the battery device 200 is in a charging state, the overvoltage fault setting function of the first pin is in an on state; wherein the target chip 220 is used to collect a first voltage of at least one battery cell among the plurality of battery cells 210 when the battery device 200 is in a charging state, and cut off the charging circuit of the battery device 200 when the first voltage is greater than or equal to a first voltage threshold.

[0098] Optionally, in an embodiment of the present application, when the first voltage is greater than or equal to the first voltage threshold, the first pin is used to output a first signal, and the first signal is used to cut off the charging circuit.

[0099] Optionally, in the embodiment of the present application, the battery device 200 further includes: a switching device connected to the target chip 220 and the plurality of battery cells 210; wherein the first pin is used to drive the switching device so that the switching device cuts off the charging circuit.

[0100] Optionally, in an embodiment of the present application, the on-off device includes a switch tube and a on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative electrode of the multiple battery cells 210, and the two ends of the on-off sub-device are respectively connected to the third end of the switch tube and the positive electrode of the multiple battery cells 210; wherein the first pin is used to drive the switch tube to turn on to output a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

[0101] Optionally, in an embodiment of the present application, the on-off sub-device includes a triggering device and a fuse, wherein the two ends of the triggering device are respectively connected to the third end of the switch tube and the positive pole of the multiple battery cells 210, and the fuse is connected to the negative pole of the multiple battery cells 210; wherein the driving voltage is used to drive the triggering device, and when the triggering device is started, the triggering device triggers the fuse to melt, thereby cutting off the charging circuit.

[0102] Optionally, in an embodiment of the present application, one end of the on-off device is connected to the negative electrode of the first battery cell among the multiple battery cells 210, and the other end of the on-off device is connected to the positive electrode of the Nth battery cell among the multiple battery cells 210, where N is determined based on the driving capability required by the on-off device.

[0103] Optionally, in an embodiment of the present application, the target chip 220 is also used to collect the second voltage of the at least one battery cell in a first collection cycle, and when the second voltage is greater than a second voltage threshold, the target chip 220 determines that the battery device 200 is in a charging state; the target chip 220 is specifically used to: collect the second voltage in a second collection cycle, and the first collection cycle is greater than the second collection cycle.

[0104] Optionally, in the embodiment of the present application, the target chip 220 is an analog front-end chip.

[0105] According to some embodiments of the present application, continue to see Figure 3 The embodiment of the present application provides a battery device, which includes N battery cells connected in series, an AFE chip, a MOSFET, an explosion fuse SQ1 and a fuse F2. Among them, the MOSFET is an N-channel MOSFET.

[0106] The AFE chip periodically collects the second voltage of at least one of the N battery cells in the sleep mode. When the AFE chip detects that the second voltage is greater than the second voltage threshold, the AFE chip enters the charging mode and remains in the active mode.

[0107] After the AFE chip enters the charging mode, only the overvoltage fault setting is configured for the Fault pin in the AFE chip. The AFE chip collects the first voltage of at least one battery cell, and when it is determined that the battery device is overcharged, the Fault pin outputs a high level, drives the MOSFET to turn on, and drives the explosives of the explosion fuse SQ1 to explode through the voltage of the m battery cells, blows off the fuse F2, and thus cuts off the charging circuit.

[0108] It should be understood that the battery device can implement the corresponding operations in the charging control method 100, which will not be described in detail for the sake of brevity.

[0109] The present application also provides an energy storage device, which may include one or more battery devices. For example, the battery device may be Figure 4 The battery device in the

[0110] The embodiment of the present application also provides an energy storage system. The energy storage system includes one or more energy storage devices. Among the multiple energy storage devices, two adjacent energy storage devices can be arranged in close contact with each other, or two rows of energy storage devices can be spaced a certain distance apart.

[0111] In addition to the energy storage device, the energy storage system may also include a PCS, which is used to connect between the power generation equipment and the energy storage device. The power generation equipment is used to generate electrical energy, and the electrical energy generated by the power generation equipment can be stored in the energy storage device through the PCS. As an example, the power generation equipment may specifically be a solar panel, a hydropower generation equipment, a thermal power generation equipment, a wind power generation equipment, etc. The specific type of the power generation equipment is not limited in this application.

[0112] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A charging control method, characterized in that: The method comprises: When the battery device is in a charging state, the target chip collects a first voltage of at least one battery cell in the battery device, the battery device includes the target chip, the target chip includes a first pin, and an overvoltage fault setting function of the first pin is in an on state; When the first voltage is greater than or equal to a first voltage threshold, the target chip cuts off a charging circuit of the battery device.

2. The method according to claim 1, characterized in that The target chip cuts off the charging circuit of the battery device, including: The first pin of the target chip outputs a first signal, and the first signal is used to cut off the charging circuit.

3. The method according to claim 1 or 2, characterized in that: The battery device further includes a switch device, the switch device is connected to the first pin and a plurality of battery cells, the plurality of battery cells include the at least one battery cell, and the target chip cuts off the charging circuit of the battery device, including: The first pin of the target chip drives the on-off device so that the on-off device cuts off the charging circuit.

4. The method according to claim 3, characterized in that The on-off device comprises a switch tube and a target on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative electrodes of the multiple battery cells, and the two ends of the on-off sub-device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells; The first pin is used to drive the switch tube to conduct, so that the switch tube outputs a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

5. The method according to claim 4, characterized in that The switching sub-device includes a triggering device and a fuse, wherein two ends of the triggering device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells, and the fuse is connected to the negative electrodes of the multiple battery cells; The driving voltage is used to drive the triggering device. When the triggering device is started, the triggering device causes the fuse to blow, thereby cutting off the charging circuit.

6. The method according to claim 3, characterized in that One end of the switch device is connected to the negative electrode of the first battery cell among the multiple battery cells, and the other end of the switch device is connected to the positive electrode of the mth battery cell among the multiple battery cells, wherein m is determined based on the driving capacity required by the switch device.

7. The method according to claim 1 or 2, characterized in that: The method further comprises: The target chip collects the second voltage of the at least one battery cell in a first collection cycle; When the second voltage is greater than or equal to a second voltage threshold, the target chip determines that the battery device is in a charging state; The target chip collects the first voltage of the at least one battery cell, including: The target chip collects the first voltage in a second collection cycle; The first acquisition period is greater than the second acquisition period.

8. A battery device, characterized in that: include: Multiple battery cells; a target chip connected to the plurality of battery cells, the target chip comprising a first pin, wherein when the battery device is in a charging state, an overvoltage fault setting function of the first pin is in an on state; The target chip is used to collect a first voltage of at least one battery cell among the multiple battery cells when the battery device is in a charging state, and to cut off a charging circuit of the battery device when the first voltage is greater than or equal to a first voltage threshold.

9. The battery device according to claim 8, characterized in that: When the first voltage is greater than or equal to the first voltage threshold, the first pin is used to output a first signal, and the first signal is used to cut off the charging circuit.

10. The battery device according to claim 8 or 9, characterized in that: The battery device further comprises: a switching device connected to the target chip and the plurality of battery cells; The first pin is used to drive the on-off device so that the on-off device cuts off the charging circuit.

11. The battery device according to claim 10, characterized in that: The on-off device comprises a switch tube and an on-off sub-device, wherein the first end of the switch tube is connected to the first pin, the second end of the switch tube is connected to the negative electrodes of the multiple battery cells, and the two ends of the on-off sub-device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells; The first pin is used to drive the switch tube to conduct to output a driving voltage, and the driving voltage is used to drive the on-off sub-device to fuse, thereby cutting off the charging circuit.

12. The battery device according to claim 11, characterized in that: The switching sub-device includes a triggering device and a fuse, wherein two ends of the triggering device are respectively connected to the third end of the switch tube and the positive electrodes of the multiple battery cells, and the fuse is connected to the negative electrodes of the multiple battery cells; The driving voltage is used to drive the triggering device. When the triggering device is started, the triggering device causes the fuse to blow, thereby cutting off the charging circuit.

13. The battery device according to claim 10, characterized in that: One end of the switch device is connected to the negative electrode of the first battery cell among the multiple battery cells, and the other end of the switch device is connected to the positive electrode of the Nth battery cell among the multiple battery cells, wherein N is determined based on the driving capacity required by the switch device.

14. The battery device according to claim 8 or 9, characterized in that: The target chip is further used to collect a second voltage of the at least one battery cell in a first collection cycle, and when the second voltage is greater than a second voltage threshold, the target chip determines that the battery device is in a charging state; The target chip is specifically used for: The second voltage is collected in a second collection period, and the first collection period is greater than the second collection period.

15. The battery device according to claim 8 or 9, characterized in that: The target chip is an analog front-end chip.

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