Battery pack management method and electronic equipment

Abstract

The invention discloses a management method of a battery pack and electronic equipment, the management method of the battery pack is applied to a controller, the controller is connected with the battery pack through a detection circuit, and the battery pack comprises at least one battery cell; the management method comprises the following steps: acquiring the charging cycle index and the battery capacity of the battery cell through the detection circuit; and when it is determined that the number of charging cycles is greater than a preset number of times, corresponding charging and discharging power is matched according to the battery capacity so as to control the battery pack to charge and discharge. Through the controller outside the battery pack, after it is determined that the number of charging cycles is larger than a certain number of times, the corresponding charging and discharging power is matched according to the battery capacity of the battery cell, and the charging and discharging power at the moment is smaller than the charging and discharging power of a new battery cell, so that the probability of occurrence of safety problems is reduced, and the safety of electronic products is improved.

Description

Technical Field

[0001] The present application relates to the field of battery management technology, and in particular to a battery pack management method and electronic equipment. Background Art

[0002] Currently, electronic products that include battery packs typically manage the battery packs through their own integrated circuit (IC) chips or battery management chips. However, as the number of charge cycles increases, these IC chips or battery management chips are prone to misjudgment, posing safety risks to electronic products. Summary of the Invention

[0003] In view of this, the present application provides a battery pack management method and electronic equipment to reduce the probability of safety issues and improve the safety of electronic products. The technical solution of this application is as follows: The first aspect of the present application provides a battery pack management method, which is applied to a controller, wherein the controller is connected to the battery pack through a detection circuit, and the battery pack includes at least one battery cell; the management method includes: obtaining the number of charging cycles and the battery capacity of the battery cell through the detection circuit; when it is determined that the number of charging cycles is greater than a preset number, matching the corresponding charging and discharging power according to the battery capacity to control the charging and discharging of the battery pack.

[0004] In one embodiment of the present application, the matching of the corresponding charge and discharge power according to the battery capacity to control the charging and discharging of the battery pack includes: when it is determined that the battery capacity is greater than a first capacity value, controlling the battery pack to charge and discharge according to the first power; when it is determined that the battery capacity is less than the first capacity value and greater than or equal to a second capacity value, controlling the battery pack to charge and discharge according to the second power; when it is determined that the battery capacity is less than the second capacity value and greater than or equal to a third capacity value, controlling the battery pack to charge and discharge according to the third power; when it is determined that the battery capacity is less than the third capacity value, prohibiting the battery pack from charging and discharging.

[0005] In an embodiment of the present application, the first power is greater than the second power, and the second power is greater than the third power.

[0006] In one embodiment of the present application, obtaining the number of charging cycles and the battery capacity of the battery cell through the detection circuit includes: obtaining the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the battery cell through the detection circuit; obtaining the number of charging cycles and the battery capacity based on the cell voltage, the cell current, the main circuit voltage, the main circuit current and the cell temperature.

[0007] In one embodiment of the present application, the battery pack further includes a battery management unit, which is connected to the battery cell, and the detection circuit is connected to the battery management unit; obtaining the number of charging cycles and the battery capacity of the battery cell through the detection circuit includes: reading the number of charging cycles and the battery capacity of the battery cell from the battery management unit.

[0008] The second aspect of the present application provides an electronic device, including a battery pack, a detection circuit and a controller, wherein the controller is connected to the battery pack through the detection circuit, and the battery pack includes at least one battery cell; the controller is used to obtain the number of charging cycles and the battery capacity of the battery cell through the detection circuit, and when it is determined that the number of charging cycles is greater than a preset number, the controller matches the corresponding charging and discharging power according to the battery capacity to control the charging and discharging of the battery pack.

[0009] In one embodiment of the present application, the controller is further used to: when it is determined that the battery capacity is greater than a first capacity value, control the battery pack to charge and discharge according to a first power; when it is determined that the battery capacity is less than the first capacity value and greater than or equal to a second capacity value, control the battery pack to charge and discharge according to a second power; when it is determined that the battery capacity is less than the second capacity value and greater than or equal to a third capacity value, control the battery pack to charge and discharge according to a third power; when it is determined that the battery capacity is less than the third capacity value, prohibit the battery pack from charging and discharging.

[0010] In one embodiment of the present application, the controller is also used to: obtain the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the battery cell through the detection circuit; and obtain the number of charging cycles and the battery capacity based on the cell voltage, the cell current, the main circuit voltage, the main circuit current and the cell temperature.

[0011] In one embodiment of the present application, the detection circuit includes a battery cell voltage sampling circuit, a battery cell current sampling circuit, a main loop voltage sampling circuit, a main loop current sampling circuit and a temperature sampling circuit; the battery cell voltage sampling circuit is used to obtain the battery cell voltage; the battery cell current sampling circuit is used to obtain the battery cell current; the main loop voltage sampling circuit is used to obtain the main loop voltage; the main loop current sampling circuit is used to obtain the main loop current; and the temperature sampling circuit is used to obtain the battery cell temperature.

[0012] In one embodiment of the present application, the battery pack further includes a battery management unit, which is connected to the battery cell, the detection circuit is connected to the battery management unit, and the controller is further used to read the number of charging cycles and battery capacity of the battery cell from the battery management unit.

[0013] It can be understood that the present application uses a controller outside the battery pack to match the corresponding charge and discharge power according to the battery capacity of the battery cell after determining that the number of charging cycles is greater than a certain number. The charge and discharge power at this time is less than the charge and discharge power of the new battery cell, thereby reducing the probability of safety problems and improving the safety of electronic equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic block diagram of an electronic device provided in an embodiment of the present application.

[0015] Figure 2 This is a flow chart of a battery pack management method provided in an embodiment of the present application.

[0016] Figure 3 This is a flow chart of controlling the charging and discharging of a battery pack according to capacity, provided in an embodiment of the present application.

[0017] Figure 4 This is a flow chart of obtaining the number of charging cycles and battery capacity provided in an embodiment of the present application.

[0018] Figure 5 This is a schematic block diagram of a second electronic device provided in an embodiment of the present application.

[0019] Figure 6 This is a schematic block diagram of a third electronic device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0020] It should be noted that, in the embodiments of the present application, "at least one" refers to one or more, and "more than one" refers to two or more than two. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. The terms "first", "second", "third", "fourth", etc. (if any) in the specification, claims and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0021] It should also be noted that the method disclosed in the embodiments of the present application or the method shown in the flowchart includes one or more steps for implementing the method. Without departing from the scope of the claims, the execution order of multiple steps can be interchanged with each other, and some steps can also be deleted.

[0022] Currently, electronic products that include battery packs typically manage the battery packs through their own integrated circuit (IC) chips or battery management chips. However, as the number of charge cycles increases, these IC chips or battery management chips are prone to misjudgment, posing safety risks to electronic products.

[0023] The embodiments of the present application provide a battery pack management method and electronic device for reducing the probability of safety problems and improving the safety of electronic products.

[0024] Please refer to Figure 1 , Figure 1 This is a schematic block diagram of an electronic device provided in an embodiment of the present application, wherein the electronic device 100 includes a battery pack 110 , a detection circuit 120 and a controller 130 .

[0025] In the embodiment of the present application, the controller 130 is connected to the battery pack 110 via the detection circuit 120. The battery pack 110 includes at least one battery cell 111. The electronic device 100 may be an electronic product including the battery pack 110, such as a mobile power bank, a mobile phone, an automobile emergency power supply, an energy storage battery, a photovoltaic energy storage device, an electric car, an electric motorcycle, a shaver, a self-balancing scooter, an electronic cigarette, and an electric toothbrush. The battery pack 110 may be a lithium battery pack, and the controller 130 may be a microcontroller 130 used for main control of the electronic device 100, etc., which is not defined here.

[0026] The detection circuit 120 can acquire battery data from the battery pack 110 in real time or at preset time intervals. The battery data includes the voltage, current, internal resistance, and battery temperature of the battery pack 110. After acquiring the battery data, the detection circuit 120 transmits the acquired battery data to the controller 130. When the battery pack 110 includes a plurality of battery cells 111, the battery cells 111 can be connected in parallel to form a parallel battery pack, or connected in series to form a series battery pack.

[0027] Next, combine Figure 1 This article introduces a battery pack management method provided by an embodiment of the present application. Figure 2 , Figure 2 A flowchart of a battery pack management method provided in an embodiment of the present application specifically includes the following steps: Step S21: obtaining the number of charging cycles and battery capacity of the battery cell through the detection circuit.

[0028] In an embodiment of the present application, the controller can obtain the number of charging cycles of each battery cell in the battery pack and the battery capacity of each battery cell through the detection circuit. Among them, the number of charging cycles is an important indicator for measuring the life of the battery cell. One charging cycle usually refers to the battery cell completing a complete charging and discharging process from 0 to 100% power. The more charging cycles, the more obvious the battery capacity decay of the battery cell. The battery capacity is the total amount of electrical energy that the battery cell can release after being fully charged. It can be expressed as a number or percentage. For example, the battery capacity of a new battery cell can be 100%. After a period of use, the battery cell decays to 80%.

[0029] The controller uses a detection circuit to obtain battery data such as the current cell's voltage, current, and internal resistance. This information is then analyzed and calculated to determine the cell's charge cycle count and battery capacity. Alternatively, if the battery pack includes a fuel gauge and a battery management unit (BMU), the detection circuit can directly obtain the cell's charge cycle count and battery capacity from the fuel gauge and BMU.

[0030] Step S22: When it is determined that the number of charging cycles is greater than the preset number, the corresponding charging and discharging power is matched according to the battery capacity to control the charging and discharging of the battery pack.

[0031] It is understandable that as the number of charging cycles of a battery cell increases, the cell ages and its internal resistance increases, causing the cell to generate more heat during the charging and discharging process. This in turn causes the electrolyte in the cell to dry out and intensifies side reactions. When the current cell is charged and discharged using the charge and discharge power of a new cell as a standard, this may cause safety issues such as battery swelling. Therefore, after determining that the number of charging cycles is greater than a certain number, the corresponding charge and discharge power can be matched according to the battery capacity of the cell. The charge and discharge power at this time is less than the charge and discharge power of the new cell, thereby reducing the probability of safety issues and improving the safety of electronic products.

[0032] In the embodiment of the present application, the above-mentioned preset number of times can be obtained through experiments, for example, it can be 300 times, and other limited numbers, which are not limited here.

[0033] It is understood that when a battery pack includes multiple cells, the battery capacity of each cell may not necessarily be the same. Therefore, in some embodiments, after determining that the number of charging cycles exceeds a preset number, the controller may match the charge and discharge power of the battery pack to the cell with the lowest battery capacity in the battery pack. This prevents the lowest battery capacity cell from causing safety issues and affecting the entire battery pack. Furthermore, the controller may gradually limit the charge and discharge power based on the battery capacity.

[0034] Please refer to Figure 3 , Figure 3A flow chart of controlling the charge and discharge of a battery pack according to capacity provided in an embodiment of the present application specifically includes the following steps: Step S31: When it is determined that the battery capacity is greater than the first capacity value, the battery pack is controlled to charge and discharge according to the first power.

[0035] In this embodiment of the present application, after determining that the number of charge cycles exceeds a preset number, the controller further determines whether the battery capacity is greater than a first capacity value. If so, the controller controls the battery pack to charge and discharge at a first power. The first capacity value can be 80%, and the first power can be the normal power for charging and discharging the battery pack.

[0036] Step S32: When it is determined that the battery capacity is less than the first capacity value and greater than or equal to the second capacity value, the battery pack is controlled to charge and discharge according to the second power.

[0037] In the embodiment of the present application, the second capacity value may be 60%, and the second power may be two-thirds of the normal power of charging and discharging the battery pack.

[0038] Step S33: When it is determined that the battery capacity is less than the second capacity value and greater than or equal to the third capacity value, the battery pack is controlled to charge and discharge according to the third power.

[0039] In the embodiment of the present application, the third capacity value may be 40%, and the third power may be half of the normal power of charging and discharging the battery pack.

[0040] Step S34: When it is determined that the battery capacity is less than the third capacity value, charging and discharging of the battery pack is prohibited.

[0041] In the embodiment of the present application, the first power is greater than the second power, and the second power is greater than the third power, that is, the controller can limit the charging and discharging power step by step according to the size of the battery capacity.

[0042] Please refer to Figure 4 , Figure 4 A flowchart for obtaining the number of charging cycles and battery capacity provided in an embodiment of the present application specifically includes the following steps: Step S41: obtaining the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the cell through the detection circuit.

[0043] Step S42: obtaining the number of charging cycles and the battery capacity according to the battery cell voltage, battery cell current, main circuit voltage, main circuit current and battery cell temperature.

[0044] In an embodiment of the present application, an analysis algorithm may be pre-stored in the controller, and the number of charging cycles and the battery capacity may be obtained based on the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature through the analysis algorithm.

[0045] In some embodiments, as Figure 5 The battery pack 110 of the electronic device 100 further includes a battery management unit 112 . The battery management unit 112 is connected to the battery cell 111 . The detection circuit 120 is connected to the battery management unit 112 .

[0046] The number of charging cycles and the battery capacity of the battery cell 111 are obtained through the detection circuit 120 , including: reading the number of charging cycles and the battery capacity of the battery cell 111 from the battery management unit 112 .

[0047] Please refer to Figure 6 , Figure 6 This is a schematic block diagram of a third electronic device provided in an embodiment of the present application. The electronic device 600 includes a battery pack 610, a detection circuit 620, and a controller 630. The detection circuit 620 includes a cell voltage sampling circuit 621, a cell current sampling circuit 622, a main circuit voltage sampling circuit 623, a main circuit current sampling circuit 624, and a temperature sampling circuit 625.

[0048] In an embodiment of the present application, the controller 630 is used to obtain the number of charging cycles and the battery capacity of the battery cell 611 of the battery pack 610 through the detection circuit 620. When it is determined that the number of charging cycles is greater than a preset number, the corresponding charging and discharging power is matched according to the battery capacity to control the charging and discharging of the battery pack 610.

[0049] In some embodiments, the controller 630 is also used to: when it is determined that the battery capacity is greater than a first capacity value, control the battery pack 610 to charge and discharge according to a first power; when it is determined that the battery capacity is less than the first capacity value and greater than or equal to the second capacity value, control the battery pack 610 to charge and discharge according to a second power; when it is determined that the battery capacity is less than the second capacity value and greater than or equal to a third capacity value, control the battery pack 610 to charge and discharge according to a third power; when it is determined that the battery capacity is less than the third capacity value, prohibit the battery pack 610 from charging and discharging.

[0050] In addition, the controller 630 is also used to: obtain the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the battery cell through the detection circuit 620, and obtain the number of charging cycles and battery capacity based on the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature.

[0051] The detection circuit 620 includes a cell voltage sampling circuit 621, a cell current sampling circuit 622, a main circuit voltage sampling circuit 623, a main circuit current sampling circuit 624, and a temperature sampling circuit 625. The cell voltage sampling circuit 621 is used to obtain the cell voltage. The cell current sampling circuit 622 is used to obtain the cell current. The main circuit voltage sampling circuit 623 is used to obtain the main circuit voltage. The main circuit current sampling circuit 624 is used to obtain the main circuit current. The temperature sampling circuit 625 is used to obtain the cell temperature.

[0052] It can be understood that the beneficial effects of the electronic device 600 can refer to the beneficial effects of the battery pack management method in the aforementioned embodiment, and will not be repeated here.

[0053] An embodiment of the present application further provides a computer storage medium, which stores a computer program. When the computer program is executed by a processor, the processor executes the above-mentioned battery pack management method.

[0054] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer storage medium or transmitted via the computer storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer storage medium may be any available medium accessible by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0055] Those skilled in the art will appreciate that all or part of the processes in the above-described method embodiments can be implemented by instructing the relevant hardware through a computer program. The program can be stored in a computer-readable storage medium. When executed, the program can include the processes of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks. The technical features of this embodiment and the implementation scheme can be combined in any manner unless they conflict.

[0056] The embodiments described above are merely preferred embodiments of the present application and are not intended to limit the scope of the present application. Without departing from the design spirit of the present application, various modifications and improvements made to the technical solutions of the present application by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present application.

Claims

1. A battery pack management method, characterized in that: Applied to a controller, the controller is connected to the battery pack via a detection circuit, the battery pack includes at least one battery cell; the management method includes: Obtaining the number of charging cycles and battery capacity of the battery cell through the detection circuit; When it is determined that the number of charging cycles is greater than a preset number, the corresponding charging and discharging power is matched according to the battery capacity to control the charging and discharging of the battery pack.

2. The management method according to claim 1, wherein: The matching of the corresponding charge and discharge power according to the battery capacity to control the charge and discharge of the battery pack includes: When determining that the battery capacity is greater than a first capacity value, controlling the battery pack to charge and discharge at a first power; When determining that the battery capacity is less than the first capacity value and greater than or equal to a second capacity value, controlling the battery pack to charge and discharge at a second power; When it is determined that the battery capacity is less than the second capacity value and greater than or equal to a third capacity value, controlling the battery pack to charge and discharge according to a third power; When it is determined that the battery capacity is less than the third capacity value, charging and discharging of the battery pack is prohibited.

3. The management method according to claim 2, characterized in that: The first power is greater than the second power, and the second power is greater than the third power.

4. The management method according to claim 1, wherein: The obtaining of the number of charging cycles and the battery capacity of the battery cell by the detection circuit includes: Obtaining the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the cell through the detection circuit; The number of charging cycles and the battery capacity are obtained according to the battery cell voltage, the battery cell current, the main circuit voltage, the main circuit current and the battery cell temperature.

5. The management method according to claim 1, wherein: The battery pack further comprises a battery management unit, the battery management unit is connected to the battery cell, and the detection circuit is connected to the battery management unit; The obtaining of the number of charging cycles and the battery capacity of the battery cell by the detection circuit includes: The number of charging cycles and the battery capacity of the battery cell are read from the battery management unit.

6. An electronic device, characterized in that: The battery pack includes a battery pack, a detection circuit, and a controller, wherein the controller is connected to the battery pack via the detection circuit, and the battery pack includes at least one battery cell; The controller is used to obtain the number of charging cycles and battery capacity of the battery cell through the detection circuit, and when it is determined that the number of charging cycles is greater than a preset number, match the corresponding charging and discharging power according to the battery capacity to control the charging and discharging of the battery pack.

7. The electronic device according to claim 6, wherein: The controller is also used to: When determining that the battery capacity is greater than a first capacity value, controlling the battery pack to charge and discharge at a first power; When determining that the battery capacity is less than the first capacity value and greater than or equal to a second capacity value, controlling the battery pack to charge and discharge at a second power; When it is determined that the battery capacity is less than the second capacity value and greater than or equal to a third capacity value, controlling the battery pack to charge and discharge according to a third power; When it is determined that the battery capacity is less than the third capacity value, charging and discharging of the battery pack is prohibited.

8. The electronic device according to claim 6, wherein: The controller is also used to: Obtaining the cell voltage, cell current, main circuit voltage, main circuit current and cell temperature of the cell through the detection circuit; The number of charging cycles and the battery capacity are obtained according to the battery cell voltage, the battery cell current, the main circuit voltage, the main circuit current and the battery cell temperature.

9. The electronic device according to claim 8, wherein The detection circuit includes a cell voltage sampling circuit, a cell current sampling circuit, a main circuit voltage sampling circuit, a main circuit current sampling circuit and a temperature sampling circuit; The cell voltage sampling circuit is used to obtain the cell voltage; The cell current sampling circuit is used to obtain the cell current; The main circuit voltage sampling circuit is used to obtain the main circuit voltage; The main loop current sampling circuit is used to obtain the main loop current; The temperature sampling circuit is used to obtain the temperature of the battery cell.

10. The electronic device according to claim 6, wherein The battery pack further includes a battery management unit, which is connected to the battery cell. The detection circuit is connected to the battery management unit. The controller is further configured to read the number of charging cycles and the battery capacity of the battery cell from the battery management unit.

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