Wide-range output charging method and system and computer readable storage medium

Abstract

The embodiment of the invention provides a wide-range output charging method and system and a computer readable storage medium, and belongs to the technical field of charging control. The charging method comprises the following steps: acquiring the number of batteries of a current to-be-charged battery pack; and determining a charging mode of the battery pack according to the number so as to charge the battery pack. According to the technical scheme, the wide-range output charging method, the wide-range output charging device and the computer readable storage medium provided by the embodiment of the invention have the advantages that the charging mode is dynamically adjusted according to the actual battery number of the battery pack; the technical defects of charging potential safety hazards and low efficiency caused by a single charging strategy in the prior art are overcome, and the charging safety and stability of the battery pack are improved.

Description

Technical Field

[0001] This invention relates to the field of charging control technology, and more specifically to a charging method, system, and computer-readable storage medium with a wide range of output. Background Technology

[0002] Ultra-wide range output AC-DC intelligent portable chargers are specialized devices for charging batteries in the special power supply industry. In order to facilitate product maintenance and repair, in recent years, special power supply chargers have been required to be able to adapt to charging different numbers of batteries with the same charger. This requires the charger to have a wide range of output voltage requirements, and existing chargers have many problems in this regard.

[0003] Existing technologies include a combination of two internal components connected in series and parallel. When there are many batteries, the two internal components are connected in series, and when there are few batteries, the two components are connected in parallel. The switch between the two types is a relay. This solution has problems such as complex control, large size, low efficiency in the low voltage range of wide output, and poor heat dissipation. There is also a solution that uses full-bridge LLC and half-bridge LLC mode switching. This solution also has the problems of low efficiency in the low voltage range of wide output and poor heat dissipation. Summary of the Invention

[0004] The purpose of this invention is to provide a charging method, system, and computer-readable storage medium with a wide output range, which can improve the stability of the charging process of the charger.

[0005] To achieve the above objectives, embodiments of the present invention provide a charging method with a wide-range output, comprising: Get the number of batteries in the battery pack that is currently waiting to be charged; The charging mode of the battery pack is determined based on the quantity to charge the battery pack.

[0006] Optionally, the number of batteries in the current battery pack to be charged is obtained, including: Obtain the original voltage of the battery pack; The first number of batteries in the battery pack is determined based on the original voltage; The upper limit of the pre-charge voltage is determined based on the first quantity; The battery pack is pre-charged according to the upper voltage limit; The first quantity is corrected based on the voltage of the battery pack after the pre-charging operation to obtain the number of batteries.

[0007] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: When the quantity is a first quantity value, determine the voltage range of the battery pack; When the current range is a preset first range, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value. When the current interval is the second interval, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is gradually adjusted from VL value to VH value according to the charging time. The upper limit of the second interval is the lower limit of the first interval.

[0008] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: When the quantity is the second quantity value, the battery pack is charged in half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, wherein the second quantity value is greater than the first quantity value.

[0009] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: When the quantity is a third quantity value, the voltage range of the battery pack is determined, wherein the third quantity value is greater than the second quantity value; When the current interval is the preset third interval, the battery pack is charged using the full-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to the VH value. When the current interval is the preset fourth interval, the battery pack is charged using the half-bridge LLC mode, the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, and the real-time voltage of the battery pack is obtained. When the real-time voltage is within the third range, the battery pack is charged using a full-bridge LLC mode.

[0010] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: When the quantity is the fourth quantity value, the battery pack is charged in full-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, wherein the fourth quantity value is greater than the third quantity value.

[0011] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: The temperature at multiple locations within the battery pack is obtained; Determine the temperature gradient and average temperature rise rate based on the temperature at multiple locations; Determine whether the temperature gradient is greater than or equal to a preset gradient threshold, and simultaneously determine whether the average temperature rise rate is greater than or equal to a preset rise rate threshold. If the temperature gradient is greater than or equal to a preset gradient threshold and / or the average temperature rise rate is greater than or equal to a preset rise rate threshold, charging is paused or the current charging voltage and charging current are reduced and maintained for a preset time length.

[0012] Optionally, determining the charging mode of the battery pack based on the quantity to charge the battery pack includes: The battery pack is subjected to constant voltage charging or constant current charging within the first time period. After the first time period, a constant current pulse charging operation is performed on the battery pack. Determine whether the voltage of the battery pack during constant current pulse charging operation is greater than or equal to a preset first voltage threshold. If the voltage of the battery pack during the constant current pulse charging operation is determined to be greater than or equal to the first voltage threshold, a constant voltage charging operation is performed on the battery pack. Determine whether the voltage of the battery pack during constant voltage charging is greater than or equal to a preset second voltage threshold. If it is determined that the voltage of the battery pack during constant voltage charging is greater than or equal to the second voltage threshold, the constant voltage charging operation shall be stopped after a second time period. Perform a float charge operation on the battery pack after stopping the constant voltage charging operation; Determine whether the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to a preset third voltage threshold. If the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to the third voltage threshold, charging is stopped.

[0013] On the other hand, the present invention also provides a charging device with a wide range of output, the charging device comprising: A charger is used to charge a battery pack that needs to be charged. A voltage detection module is used to obtain the voltage of the battery pack to be charged; The controller is configured to acquire the voltage of the battery pack to be charged through the voltage detection module and execute any of the methods described above to control the charger to charge the battery pack.

[0014] In another aspect, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine to cause the machine to perform any of the methods described above.

[0015] Through the above technical solutions, the embodiments of the present invention provide a charging method, apparatus, and computer-readable storage medium with a wide range of output. The charging method, apparatus, and computer-readable storage medium dynamically adjust the charging mode according to the actual number of batteries in the battery pack, overcoming the charging safety hazards and low efficiency technical defects caused by the single charging strategy in the prior art, and improving the safety and stability of battery pack charging.

[0016] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a flowchart of a wide-range output charging method according to an embodiment of the present invention; Figure 2 This is a flowchart of a method for obtaining the number of batteries in a battery pack according to an embodiment of the present invention; Figure 3 This is a flowchart of a method for selecting a charging mode based on the number of batteries according to an embodiment of the present invention; Figure 4 This is a flowchart of a method for selecting a charging mode based on the number of batteries according to an embodiment of the present invention; Figure 5 This is a flowchart of a method for charging a battery pack according to an embodiment of the present invention; Figure 6 This is a flowchart of a method for charging a battery pack according to an embodiment of the present invention. Detailed Implementation

[0018] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.

[0019] It should be noted that the acquisition, transmission, storage, use, and processing of data in the technical solution of this application all comply with relevant laws and regulations. In the embodiments of this application, certain existing industry solutions such as software, components, and models may be mentioned. These should be considered exemplary, intended only to illustrate the feasibility of implementing the technical solution of this application, and do not imply that the applicant has already used or necessarily used such solutions.

[0020] like Figure 1 The diagram shows a flowchart of a wide-range output charging method according to an embodiment of the present invention. Figure 1 The charging method may include the following steps: In step S10, the number of batteries in the current battery pack to be charged is obtained; In step S11, the charging mode of the battery pack is determined according to the number of batteries in the battery pack, so as to charge the battery pack.

[0021] In such Figure 1 In the method shown, step S10 can be used to obtain the number of batteries in the current battery pack to be charged, thereby allowing for accurate selection of the battery pack's charging mode based on this number. This number can represent the number of individual battery cells or the number of battery cells composed of at least one individual battery cell. In one example of the invention, this number can represent the number of individual battery cells.

[0022] The specific method for obtaining the number of batteries in the battery pack in step S11 can be in various forms known to those skilled in the art. For example, it can be obtained by directly counting the number of batteries. In the case of lithium-ion batteries, the number can also be obtained directly by connecting to a BMS. In one example of the present invention, considering that the batteries used for charging are mainly lead-acid batteries, and that lead-acid battery packs are mostly packaged in groups (with a small number of individual cells), there is no direct counting, and lead-acid batteries are generally not equipped with a BMS. Therefore, it can be done using methods such as... Figure 2 The method shown is used to obtain the number of batteries in the battery pack. Figure 2 In this context, the method for obtaining the number of batteries in the battery pack may include the following steps: In step S20, the original voltage of the battery pack is obtained.

[0023] In step S21, the first number of batteries in the battery pack is determined based on the original voltage.

[0024] In step S22, the upper limit of the pre-charge voltage is determined based on the first quantity.

[0025] In step S23, a pre-charging operation is performed on the battery pack according to the upper voltage limit. This pre-charging operation can be a conventional pre-charging operation known to those skilled in the art. To avoid the pre-charging operation significantly affecting the detected voltage, the pre-charging operation time can be set to less than or equal to 1 minute.

[0026] In step S24, the first quantity is corrected based on the voltage of the battery pack after the pre-charging operation to obtain the number of batteries.

[0027] In such Figure 2 In the method shown, step S10 can be used to obtain the original voltage of the battery pack. This original voltage can be the voltage value directly detected when the battery pack is not charged.

[0028] In this example, because the overall output voltage of the battery pack is low, the charger cannot directly and accurately determine the number of batteries in the pack. Therefore, a pre-charging operation is necessary to ensure the battery pack has sufficient charge for the charger to determine the number of batteries. Before the pre-charging operation, to avoid damage to the battery pack from the charger's pre-charging, the number of batteries in the pack needs to be roughly determined first (i.e., the initial number). Then, based on this number, the upper limit of the pre-charging voltage is determined to ensure the safety of the pre-charging. Therefore, this... Figure 2 The method shown determines the upper voltage limit through steps S21 and S22, and then performs a pre-charging operation based on the upper voltage limit, thereby protecting the battery pack.

[0029] Specifically, in step S21, the first quantity can represent the number of batteries in the battery pack as initially determined. In this example, the specific method for determining this first quantity can be based on the original standard voltage of each individual battery in the battery pack. For example, taking a 6V-12V standard voltage battery as an example: when the original voltage is 6V-12V, the first quantity can be 1; when the original voltage is 12-18V, the first quantity can be 2; when the original voltage is 18V-24V, the first quantity can be 3; and when the original voltage is above 24V, the first quantity can be 4. Furthermore, for cases where the original voltage is less than 6V, it indicates that the batteries in the battery pack are in a deeply discharged state. In this case, the battery pack cannot be directly charged, so each battery in the battery pack can be activated individually. Specifically, this individual activation operation can be achieved by setting the charger to half-bridge LLC mode, and setting the voltage of the power factor correction circuit in the AC / DC section to VL.

[0030] In step S22, the method for determining the upper voltage limit based on the first quantity can also be based on the original gauge voltage of the individual battery cell, taking a standard voltage battery of 6V-12V as an example. When the first quantity is 1, the upper voltage limit can be 15V; when the first quantity is 2, the upper voltage limit can be 30V; when the first quantity is 3, the upper voltage limit can be 45V; and when the first quantity is 4, the upper voltage limit can be 60V. The specific method for this pre-charging operation can be of various forms known to those skilled in the art. In this example, the pre-charging operation can be performed using constant current or constant voltage charging for a charging process lasting less than or equal to 1 minute.

[0031] The specific method for correcting the first quantity in step S23 can be of various forms known to those skilled in the art. In this example, it can be that a new quantity judgment is first made based on the voltage after the pre-charge operation, and the result of the new quantity judgment is compared with the first quantity. If they are the same, the correction is completed; if they are different, the new quantity is taken as the standard. Specifically, the method for judging the new quantity can also take a standard voltage battery of 6V-12V as an example. When the voltage of the battery pack after the pre-charge operation is 6V-15V, the result of the quantity judgment can be 1; when the voltage of the battery pack after the pre-charge operation is 15V-30V, the result of the quantity judgment can be 2; when the voltage of the battery pack after the pre-charge operation is 30V-45V, the result of the quantity judgment can be 3; and when the original voltage is 45V-60V or higher, the result of the quantity judgment can be 4.

[0032] Step S11 can be used to determine the charging mode of the battery pack based on the number of batteries in the battery pack, in order to charge the battery pack. Because existing technologies use a uniform charging strategy when charging battery packs, it is difficult to select an efficient and accurate charging mode for effective charging, thus limiting the charging efficiency of the battery pack. Therefore, in this embodiment of the invention, by determining the charging mode based on the number of batteries in the battery pack in step S11, the most efficient charging mode can always be used during the battery pack charging process, thereby improving the charging efficiency and safety of the battery pack. Specifically, the method for selecting the charging mode based on the number of batteries can include, for example... Figure 3 The steps shown are described in this. Figure 3 and Figure 4 In this context, the method for selecting a charging mode based on the number of batteries may include the following steps: In step S30, if the number of batteries in the battery pack is a first quantity value, the voltage range of the battery pack is determined. In this example, the first quantity value can be, for example, 1. In step S31, if the current range is a preset first range, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit in the AC / DC section is adjusted to VH. In this example, the first range can be, for example, greater than 10V; In step S32, when the current range is the second range, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit in the AC / DC section is gradually adjusted from VL to VH according to the charging time. The upper limit of the second range is the lower limit of the first range. In this example, the second range can be, for example, 6V to 10V. In step S33, when the number of batteries in the battery pack is a second quantity value, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit in the AC / DC section is adjusted to VH value, wherein the second quantity value is greater than the first quantity value. In this example, the second quantity value can be, for example, 2.

[0033] In step S34, if the number of batteries in the battery pack is a third quantity value, the voltage range of the battery pack is determined, wherein the third quantity value is greater than the second quantity value. In this example, the third quantity value could be, for example, 3.

[0034] In step S35, if the current range is a preset third range, the battery pack is charged using a full-bridge LLC mode, and the power factor correction circuit of the AC / DC section is adjusted to a value of VH. This third range can be, for example, greater than or equal to 30V.

[0035] In step S36, if the current range is a preset fourth range, the battery pack is charged using a half-bridge LLC mode, the power factor correction circuit of the AC / DC section is adjusted to VH, and the real-time voltage of the battery pack is obtained. This fourth range can be, for example, 18V to 30V (excluding 30V).

[0036] In step S37, when the real-time voltage is in the third range, the battery pack is charged using a full-bridge LLC mode. In this example, the two-stage charging method in steps S37 and S38 prevents the battery pack voltage from deviating from the resonant point during the charging process, thus avoiding the problem of low efficiency and severe heat generation caused by this.

[0037] In step S38, when the number of batteries in the battery pack is a fourth value, the battery pack is charged using a full-bridge LLC mode, and the correction value of the power factor correction circuit in the AC / DC section is adjusted to VH value, wherein the fourth value is greater than the third value. In this example, the fourth value can be, for example, 4.

[0038] Furthermore, in this embodiment, considering the actual temperature of the battery pack during charging, dynamic control is needed to avoid safety accidents caused by the failure of a single battery or cell. Therefore, in one example of the present invention, the method for charging the battery pack may further include, as follows: Figure 5 The steps shown are described in this. Figure 5 In addition, the method for charging the battery pack may also include the following steps: In step S40, the temperature at multiple locations within the battery pack is obtained; In step S41, the temperature gradient and average temperature rise rate are determined based on the temperatures at multiple locations; In step S42, it is determined whether the temperature gradient is greater than or equal to a preset gradient threshold (e.g., 3℃ / cm), and simultaneously, it is determined whether the average temperature rise rate is greater than or equal to a preset rise rate threshold (e.g., 0.5℃ / min). The temperature gradient can be used to represent the temperature difference calculated from multiple temperatures at multiple locations within the battery pack along a preset direction. Since the battery pack itself comprises multiple batteries or cells, the heat dissipation efficiency varies at each location. Therefore, using a temperature gradient for judgment provides more accurate control precision compared to conventional temperature judgment. The average temperature rise rate, on the other hand, is judged from the perspective of the entire battery pack, ensuring stable charging of the entire battery pack.

[0039] In step S43, if it is determined that the temperature gradient is greater than or equal to a preset gradient threshold and / or the average temperature rise rate is greater than or equal to a preset rise rate threshold, charging is paused or the current charging voltage and charging current are reduced and maintained for a preset time length. Alternatively, in this example, if it is determined that the temperature gradient is greater than or equal to a preset gradient threshold and / or the average temperature rise rate is greater than or equal to a preset rise rate threshold, a preset heat dissipation module may be used to dissipate heat from the battery pack.

[0040] In this embodiment, to ensure stable battery charging, in one example of the present invention, the following method may be used: Figure 6 The method shown is used for charging. Figure 6 In this case, the following steps can be used for charging: In step S50, the battery pack is subjected to constant voltage charging or constant current charging within the first time length. In step S51, a constant current pulse charging operation is performed on the battery pack after the first time length. In step S52, it is determined whether the voltage of the battery pack in the constant current pulse charging operation is greater than or equal to a preset first voltage threshold. In step S53, if it is determined that the voltage of the battery pack in the constant current pulse charging operation is greater than or equal to the first voltage threshold, a constant voltage charging operation is performed on the battery pack. In step S54, it is determined whether the voltage of the battery pack during the constant voltage charging operation is greater than or equal to a preset second voltage threshold. In step S55, if it is determined that the voltage of the battery pack during the constant voltage charging operation is greater than or equal to a second voltage threshold, the constant voltage charging operation is stopped after a second time period. In this example, the second time period can be, for example, 3 minutes to 10 minutes.

[0041] In step S56, the battery pack is float-charged after the constant voltage charging operation is stopped. In step S57, it is determined whether the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to a preset third voltage threshold. In step S58, charging is stopped if the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to the third voltage threshold.

[0042] On the other hand, the present invention also provides a charging device with a wide output range, the charging device including a charger, a voltage detection module, and a controller. The charger can be used to charge a battery pack to be charged. The voltage detection module can be used to acquire the voltage of the battery pack to be charged. The controller can be used to acquire the voltage of the battery pack to be charged through the voltage detection module and perform actions such as... Figures 1 to 6 The method shown controls the charger to charge the battery pack to be charged. In one example of this invention, to reduce the overall product size, the controller can be located inside the charger to cooperate with the charging module within the charger for charging operations.

[0043] In another aspect, the present invention also provides a computer-readable storage medium storing instructions for being read by a machine to cause the machine to perform any of the methods described above.

[0044] Through the above technical solutions, the embodiments of the present invention provide a charging method, apparatus, and computer-readable storage medium with a wide range of output. The charging method, apparatus, and computer-readable storage medium dynamically adjust the charging mode according to the actual number of batteries in the battery pack, overcoming the charging safety hazards and low efficiency technical defects caused by the single charging strategy in the prior art, and improving the safety and stability of battery pack charging.

[0045] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0046] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0047] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0048] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0049] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0050] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0051] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0052] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0053] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A charging method with a wide output range, characterized in that, include: Get the number of batteries in the battery pack that is currently waiting to be charged; The charging mode of the battery pack is determined based on the quantity to charge the battery pack.

2. The charging method according to claim 1, characterized in that, Get the number of batteries in the current battery pack that needs to be charged, including: Obtain the original voltage of the battery pack; The first number of batteries in the battery pack is determined based on the original voltage; The upper limit of the pre-charge voltage is determined based on the first quantity; The battery pack is pre-charged according to the upper voltage limit; The first quantity is corrected based on the voltage of the battery pack after the pre-charging operation to obtain the number of batteries.

3. The charging method according to claim 1, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: When the quantity is a first quantity value, determine the voltage range of the battery pack; When the current range is a preset first range, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value. When the current interval is the second interval, the battery pack is charged using a half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is gradually adjusted from VL value to VH value according to the charging time. The upper limit of the second interval is the lower limit of the first interval.

4. The charging method according to claim 3, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: When the quantity is the second quantity value, the battery pack is charged in half-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, wherein the second quantity value is greater than the first quantity value.

5. The charging method according to claim 4, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: When the quantity is a third quantity value, the voltage range of the battery pack is determined, wherein the third quantity value is greater than the second quantity value; When the current interval is the preset third interval, the battery pack is charged using the full-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to the VH value. When the current interval is the preset fourth interval, the battery pack is charged using the half-bridge LLC mode, the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, and the real-time voltage of the battery pack is obtained. When the real-time voltage is within the third range, the battery pack is charged using a full-bridge LLC mode.

6. The charging method according to claim 5, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: When the quantity is the fourth quantity value, the battery pack is charged in full-bridge LLC mode, and the correction value of the power factor correction circuit of the AC / DC section is adjusted to VH value, wherein the fourth quantity value is greater than the third quantity value.

7. The method according to claim 1, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: The temperature at multiple locations within the battery pack is obtained; Determine the temperature gradient and average temperature rise rate based on the temperature at multiple locations; Determine whether the temperature gradient is greater than or equal to a preset gradient threshold, and simultaneously determine whether the average temperature rise rate is greater than or equal to a preset rise rate threshold. If the temperature gradient is greater than or equal to a preset gradient threshold and / or the average temperature rise rate is greater than or equal to a preset rise rate threshold, charging is paused or the current charging voltage and charging current are reduced and maintained for a preset time length.

8. The method according to claim 1, characterized in that, Determining the charging mode of the battery pack based on the quantity, in order to charge the battery pack, includes: The battery pack is subjected to constant voltage charging or constant current charging within the first time period. After the first time period, a constant current pulse charging operation is performed on the battery pack. Determine whether the voltage of the battery pack during constant current pulse charging operation is greater than or equal to a preset first voltage threshold. If the voltage of the battery pack during the constant current pulse charging operation is determined to be greater than or equal to the first voltage threshold, a constant voltage charging operation is performed on the battery pack. Determine whether the voltage of the battery pack during constant voltage charging is greater than or equal to a preset second voltage threshold. If it is determined that the voltage of the battery pack during constant voltage charging is greater than or equal to the second voltage threshold, the constant voltage charging operation shall be stopped after a second time period. Perform a float charge operation on the battery pack after stopping the constant voltage charging operation; Determine whether the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to a preset third voltage threshold. If the voltage of the battery pack after the constant voltage charging operation is stopped is greater than or equal to the third voltage threshold, charging is stopped.

9. A charging device with a wide output range, characterized in that, The charging device includes: A charger is used to charge a battery pack that needs to be charged. A voltage detection module is used to obtain the voltage of the battery pack to be charged; A controller is configured to acquire the voltage of the battery pack to be charged through the voltage detection module and execute the method as described in any one of claims 1 to 8 to control the charger to charge the battery pack.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that are read by a machine to cause the machine to perform the method as described in any one of claims 1 to 8.

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