A charging control method and device for a battery pack cascade power supply integrated topology

Abstract

The present invention provides a charging control method and device for an integrated topology of a battery cascade power supply, belonging to the field of power electronic control technology. The method uses a constant current source charger as an integrated charger to simultaneously charge battery packs of cascade modules at each level, utilizes the IGBT half-bridges in the existing cascade modules at each level, realizes the separate charging of battery packs of cascade modules at each level, adopts a multi-stage charging process, and the target charging voltage values ​​of different charging stages gradually increase, while the charging current value decreases, which is consistent with the characteristics of the battery charging process. The present invention can separately control the time for battery packs of different cascade modules to be connected to or cut out of the charging circuit, and the charging process is flexible.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronic control, and in particular relates to a charging control method and device of a battery pack cascade power supply integrated topology. Background Art

[0002] The cascade primary power supply is one of the circuit topologies suitable for high-voltage pulse capacitor charging. It was first proposed in the Chinese patent application CN104868714A (a high-voltage capacitor charging device based on supercapacitor cascade), which mainly solves the problem of high power and light weight of high-voltage pulse capacitor charging power supply. Taking lithium iron phosphate batteries as an example, the energy storage units in each module of the cascade primary power supply are connected by lithium iron phosphate batteries. According to the characteristics of lithium batteries, the mainstream charging methods currently used mainly include constant current charging (CC Charge), constant voltage charging (CV Charge), constant current and constant voltage charging (CC-CV Charge), constant power charging (CP Charge) and constant power and constant voltage charging (CP-CV Charge). There is no research on the issue of battery pack charging. In engineering, the battery pack is charged by a constant current charging method. Each level of battery pack is charged by a distributed charger. The charger uses a constant current source. When charging, it outputs different current values ​​according to the voltage range of the single cell in each cascade module.

[0003] Taking 20-level cascade module and lithium iron phosphate battery as an example, the charging topology of the existing technology is as follows: Figure 1As shown, it includes 20 levels of cascade modules, inductors, thyristors, and capacitors connected in series; each level of the cascade module is composed of an IGBT half-bridge, a battery pack, an isolating switch, and a charger, wherein the IGBT half-bridge is composed of an IGBT upper tube and an IGBT lower tube, the battery pack is connected to both ends of the IGBT half-bridge, and the charger and the isolating switch are connected in series to both ends of the battery pack. This structure connects 20 levels of cascade modules in series so that the load capacitor can be charged to 7000V. At the same time, each level of the cascade module is charged by a charger, a total of 20 chargers, namely: the first charger, the second charger, ..., the twentieth charger. After each level of the isolating switch is closed, the chargers at each level charge the battery packs of the cascade modules at each level. For example, when the voltage of a single cell is less than 3.5V, the constant current source outputs a 40A charging current; when the voltage of a single cell is greater than or equal to 3.5V and less than 3.6V, the constant current source outputs a 20A charging current; when the voltage of a single cell is greater than or equal to 3.6V and less than 3.65V, the constant current source outputs a 10A charging current; when the voltage of a single cell reaches 3.65V, charging ends. This charging control method can output the corresponding charging current to the module at that level according to the voltage of the lithium battery in different cascade modules, but due to the use of distributed chargers, it has many shortcomings such as low power density and high manufacturing cost. Summary of the invention

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A charging control method for a battery pack cascade power supply integrated topology, comprising:

[0006] Step 1: The controller of the charging system sets the total number of charging stages M and the target charging voltage value U of the jth charging stage. j , Charging current value I j , send a charging start instruction to the level control board of the N-level cascade module;

[0007] Step 2: The control board of the i-th cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th cascade module, and the battery manager of the i-th cascade module receives the charging start instruction;

[0008] Step 3: The battery manager of the i-th cascade module detects the voltage value of the single battery of the battery group of the i-th cascade module and sends the voltage value of the single battery back to the control board of the i-th cascade module;

[0009] Step 4, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller;

[0010] Step 5: The controller determines whether the voltage value of the single battery of the battery pack of the i-th stage cascade module reaches U j ; If the voltage value of the single battery reaches Uj , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ;

[0011] Step 6, enter the j+1th charging stage, and execute steps 3 to 5; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage. M , the constant current source charger stops outputting current and the charging process ends;

[0012] The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than I j+1 .

[0013] A charging control device with a battery pack cascade power supply integrated topology includes the following modules:

[0014] The charging instruction sending module, the controller of the charging system sets the total number of charging stages M, the target charging voltage value U of the jth charging stage j , Charging current value I j , send a charging start instruction to the level control board of the N-level cascade module;

[0015] A charging instruction forwarding module, wherein the level control board of the i-th level cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th level cascade module, and the battery manager of the i-th level cascade module receives the charging start instruction;

[0016] The voltage value detection module, the battery manager of the i-th level cascade module detects the voltage value of the single battery of the battery group of the i-th level cascade module and sends the voltage value of the single battery back to the level control board of the i-th level cascade module;

[0017] The voltage value forwarding module, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller;

[0018] The charging module controller determines whether the voltage value of the single battery of the battery pack of the i-th cascade module reaches U j ; If the voltage value of the single battery reaches U j , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ;

[0019] The charging end control module enters the j+1th charging stage and sequentially executes the operations included in the voltage value detection module, the voltage value forwarding module and the charging module; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage M , the constant current source charger stops outputting current and the charging process ends;

[0020] The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than I j+1 .

[0021] An electronic device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the charging control method of the battery pack cascade power supply integrated topology are implemented.

[0022] A non-transitory computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the charging control method of the battery pack cascade power supply integrated topology.

[0023] The present invention has the following beneficial effects:

[0024] In the integrated charging topology of the present invention, the charging system omits multiple distributed chargers and their corresponding multiple high-voltage isolating switches, and is replaced by a constant current source charger. Only two connecting lines are needed to connect the integrated charger and all cascade modules for charging, saving the manufacturing cost of the charging system. The charging topology of the present invention connects the integrated charger in series to the charging circuit without changing the current main circuit connection structure of the cascade module, and charges the battery packs at each stage in series. The IGBT half-bridge in each existing cascade module is used to realize staged constant current charging of the battery packs of each cascade module. Different cascade modules can select different types of battery packs, and the battery packs are put into charging when the charger outputs a suitable current value. In the charging control method of the present invention, a multi-stage charging process is adopted, and the charging target voltage in different charging stages gradually increases, while the charging current decreases, which is consistent with the characteristics of the battery charging process and is suitable for charging various types of batteries such as lithium batteries; in each stage of the charging process, a battery pack with a voltage within the voltage range of this stage is selected to be connected to the charging circuit for charging, and battery packs with different initial voltages can be charged; the charging control structure adopts the control architecture of the battery butler, the stage control board, the controller, and the IGBT driver board, which respectively control the time when the battery packs of different cascade modules are connected or cut out of the charging circuit, and the charging process is flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the charging topology structure of the prior art;

[0026] Figure 2 It is a schematic diagram of the structure of the integrated topology of the battery pack cascade power supply of the present invention;

[0027] Figure 3 It is a flow chart of the charging control method of the battery pack cascade power supply integrated topology of the present invention. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] The charging control method of the battery pack cascade power supply integrated topology proposed by the present invention uses a constant current source charger as an integrated charger to simultaneously charge the battery packs of each level of cascade modules, and utilizes the IGBT half-bridge in the existing cascade modules at each level to realize the separate charging of the battery packs of each level of cascade modules, specifically including:

[0030] Step 1: The controller of the charging system sets the total number of charging stages M and the target charging voltage value U of the jth charging stage. j , Charging current value I j , sends a charging start command to the level control board of the N-level cascade module; where N is determined according to the floor space of the entire power system, M, U j ,I j Determined according to the characteristics of the battery.

[0031] Step 2: The control board of the i-th cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th cascade module, and the battery manager of the i-th cascade module receives the charging start instruction;

[0032] Step 3: The battery manager of the i-th cascade module detects the voltage value of the single battery of the battery group of the i-th cascade module and sends the voltage value of the single battery back to the control board of the i-th cascade module;

[0033] Step 4, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller;

[0034] Step 5: The controller determines whether the voltage value of the single battery of the battery pack of the i-th stage cascade module reaches U j ; If the voltage value of the single battery reaches U j , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ;

[0035] Step 6, enter the j+1th charging stage, and execute the above steps 3 to 5; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage. M , the constant current source charger stops outputting current and the charging process ends;

[0036] The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than Ij+1 .

[0037] Among them, the charging system includes: a controller, an N-level cascade module, and a constant current source charger connected in sequence, the controller is connected to the level control board in the N-level cascade module, and the constant current source charger is connected in parallel to the N-level cascade module. Each level of the N-level cascade module includes a level control board, a battery butler, a battery pack composed of single cells, an IGBT driver board, and an IGBT half-bridge; in each level of the cascade module, the level control board, the battery butler, and the battery pack are connected in sequence, and the level control board is connected to the IGBT driver board, and the IGBT driver board is connected to the IGBT half-bridge. The IGBT half-bridge of each cascade module consists of an IGBT upper tube and an IGBT lower tube. The positive electrode of the battery pack is connected to the collector of the IGBT upper tube, the emitter of the IGBT upper tube is connected to the collector of the IGBT lower tube, and the emitter of the IGBT lower tube is connected to the negative electrode of the battery pack. The bases of the IGBT upper tube and the IGBT lower tube are connected to the IGBT driver board as control ends. The IGBT upper tube and the IGBT lower tube are respectively composed of an IGBT and a FWD in parallel. The IGBT is an insulated gate bipolar transistor chip, and the FWD is a freewheeling diode chip. After the N-level cascade modules are connected in series, they are connected in series with the inductor, thyristor and capacitor; the N-level cascade modules are connected in series in the following manner: the emitter of the IGBT upper tube of the i-th cascade module is connected to the collector of the IGBT upper tube of the i+1-th cascade module; the constant current source charger is connected to both ends of the N-level cascade module as a whole, specifically: the positive electrode of the constant current source charger is connected to the collector of the IGBT upper tube of the 1st cascade module, and the negative electrode of the constant current source charger is connected to the emitter of the IGBT upper tube of the N-th cascade module; wherein i is 1 to N-1. The controller is a control board based on an ARM controller or a control board based on a DSP. The multiple single cells of the battery pack of the i-th cascade module are rechargeable batteries of the same type, such as lithium iron phosphate batteries, lithium titanate batteries, lead-acid batteries, nickel-cadmium batteries or nickel-hydrogen batteries.

[0038] The present invention further proposes a charging control device of a battery pack cascade power supply integrated topology, comprising the following modules:

[0039] The charging instruction sending module, the controller of the charging system sets the total number of charging stages M, the target charging voltage value U of the jth charging stage j , Charging current value I j , send a charging start instruction to the level control board of the N-level cascade module;

[0040] A charging instruction forwarding module, wherein the level control board of the i-th level cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th level cascade module, and the battery manager of the i-th level cascade module receives the charging start instruction;

[0041] The voltage value detection module, the battery manager of the i-th level cascade module detects the voltage value of the single battery of the battery group of the i-th level cascade module and sends the voltage value of the single battery back to the level control board of the i-th level cascade module;

[0042] The voltage value forwarding module, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller;

[0043] The charging module controller determines whether the voltage value of the single battery of the battery pack of the i-th cascade module reaches U j ; If the voltage value of the single battery reaches U j , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ;

[0044] The charging end control module enters the j+1th charging stage and sequentially executes the operations included in the voltage value detection module, the voltage value forwarding module and the charging module; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage M , the constant current source charger stops outputting current and the charging process ends;

[0045] The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than I j+1 .

[0046] The present invention further proposes an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of the charging control method of the battery pack cascade power supply integrated topology are implemented.

[0047] The present invention further proposes a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the charging control method of the battery pack cascade power supply integrated topology.

[0048] The technical solution of the present invention is described below by taking 20-stage cascade modules and lithium iron phosphate batteries as an example. Other numbers of cascade modules can be set according to actual needs.

[0049] like Figure 2 As shown, the structure of the integrated topology of the battery pack cascade power supply of the present invention includes: 20-level cascade modules, a constant current source charger, an inductor, a thyristor and a capacitor; wherein, each level of the 20-level cascade modules is composed of a battery pack and an IGBT half-bridge connected in series; in each level of the cascade module, the IGBT half-bridge is composed of an IGBT upper tube and an IGBT lower tube, the positive electrode of the battery pack is connected to the collector of the IGBT upper tube, the emitter of the IGBT upper tube is connected to the collector of the IGBT lower tube, the emitter of the IGBT lower tube is connected to the negative electrode of the battery pack, the bases of the IGBT upper tube and the IGBT lower tube are connected to the IGBT driving board as control terminals, the IGBT upper tube and the IGBT lower tube are respectively composed of an IGBT and a FWD connected in parallel, the IGBT is an insulated gate bipolar transistor chip, the FWD is a freewheeling diode chip, and the battery pack is composed of a plurality of single cells.

[0050] Among them, the 20-stage cascade module is connected in series with the inductor, thyristor and capacitor; the 20-stage cascade module is connected in series in the following manner: the emitter of the IGBT upper tube of the i-stage cascade module is connected to the collector of the IGBT upper tube of the i+1-stage cascade module; the constant current source charger is connected to both ends of the 20-stage cascade module as a whole, specifically: the positive electrode of the constant current source charger is connected to the collector of the IGBT upper tube of the first-stage cascade module, and the negative electrode of the constant current source charger is connected to the emitter of the IGBT upper tube of the 20th-stage cascade module; wherein i is a positive integer from 1 to 19. The positive electrode of the constant current source charger is connected to the collector of the IGBT upper tube of the first-stage cascade module, and the negative electrode of the constant current source charger is connected to the emitter of the IGBT upper tube of the 20th-stage cascade module.

[0051] The charging system of the present invention comprises a controller, an N-level cascade module, and a constant current source charger connected in sequence, the controller is connected to the level control board in the N-level cascade module, and the constant current source charger is connected in parallel to the N-level cascade module. Each level of the N-level cascade module comprises a level control board, a battery butler, a battery pack composed of single cells, an IGBT driver board, and an IGBT half-bridge; in each level of the cascade module, the level control board, the battery butler, and the battery pack are connected in sequence, and the level control board is connected to the IGBT driver board, and the IGBT driver board is connected to the IGBT half-bridge.

[0052] like Figure 3 As shown, the charging control method of the battery pack cascade power supply integrated topology of the present invention includes:

[0053] Step 1, the controller of the charging system sets the total number of charging stages to 3, the target charging voltage value of the first charging stage to 3.5V, the charging current value to 40A, the target charging voltage value of the second charging stage to 3.6V, the charging current value to 20A, the target charging voltage value of the third charging stage to 3.65V, the charging current value to 10A, and the controller sends a charging start instruction to the level control board of the 20-level cascade module;

[0054] Step 2: The control board of the i-th cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th cascade module, and the battery manager of the i-th cascade module receives the charging start instruction;

[0055] Step 3: The battery manager of the i-th cascade module detects the voltage value of the single battery of the battery group of the i-th cascade module and sends the voltage value of the single battery back to the control board of the i-th cascade module;

[0056] Step 4, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller;

[0057] Step 5: The controller determines whether the voltage value of the single battery of the battery pack of each cascade module reaches 3.5V.

[0058] For the cascade modules whose single-cell battery voltage value reaches 3.5V, the controller sends an IGBT control signal (level trigger signal) to the IGBT driver board of the cascade module through the stage control board of the cascade module, and controls the IGBT upper tube of the IGBT half-bridge in the cascade module to be turned on to control the battery pack of the cascade module to cut out of the charging circuit and not charge; for the cascade modules whose single-cell battery voltage value does not reach 3.5V, the controller does not send the IGBT control signal (the battery pack of the corresponding cascade module does not cut out of the charging circuit and maintains the charging state); at the same time, the controller sends a charging current instruction to the constant current source charger, so that the constant current source charger outputs a charging current of 40A to charge the battery pack of the cascade module connected to the charging circuit until the single-cell battery voltage value of all battery packs reaches 3.5V.

[0059] Step 6, entering the second charging stage, performing the above steps 3 to 5 for the second time, wherein in step 5, for the cascade module whose single cell voltage value reaches 3.6V, the controller sends an IGBT control signal (level trigger signal) to the IGBT driver board of the cascade module through the stage control board of the cascade module, controls the conduction of the IGBT upper tube of the IGBT half-bridge in the cascade module to control the battery pack of the cascade module to cut out of the charging circuit and not charge; for the cascade module whose single cell voltage value does not reach 3.6V, the controller does not send the IGBT control signal (the battery pack of the corresponding cascade module does not cut out of the charging circuit and maintains the charging state); at the same time, the controller sends a charging current instruction to the constant current source charger, so that the constant current source charger outputs a charging current of 20A to charge the battery pack of the cascade module connected to the charging circuit until the single cell voltage values ​​of all battery packs reach 3.6V.

[0060] Entering the third charging stage, the above steps 3 to 5 are performed for the third time, wherein in step 5, for the cascade module whose single cell voltage value reaches 3.65V, the controller sends an IGBT control signal (level trigger signal) to the IGBT driving board of the cascade module of this level through the level control board of the cascade module of this level, controls the conduction of the IGBT upper tube of the IGBT half-bridge in the cascade module of this level to control the battery pack of the cascade module of this level to cut out the charging circuit and not charge; for the cascade module whose single cell voltage value does not reach 3.65V, the controller does not send the IGBT control signal (the battery pack of the corresponding cascade module does not cut out the charging circuit and maintains the charging state); at the same time, the controller sends a charging current instruction to the constant current source charger, so that the constant current source charger outputs a charging current of 10A to charge the battery pack of the cascade module connected to the charging circuit until the single cell voltage values ​​of all battery packs reach 3.65V, at which time, the constant current source charger stops outputting current and the charging process ends.

[0061] The charging topology of the present invention connects the integrated charger in series to the charging circuit without changing the main circuit connection structure of the current cascade module, and charges the battery packs in series at each level. The IGBT half-bridge in the existing cascade modules is used to realize the staged constant current charging of the battery packs of each cascade module. Different cascade modules can select different types of battery packs, and the battery packs are charged when the charger outputs a current value of appropriate size. The charging voltages corresponding to different types of battery packs are also different. Different charging voltage ranges can be set in the controller according to the type of each battery pack. For example, when the single cell voltage of battery pack A is 3.5-3.6V, the charging current is 20A, and when the single cell voltage of battery pack B is 4.5-4.6V, the charging current is 20A. The end of the 20A charging stage is marked when the single cell voltage of battery pack A reaches 3.6V and the single cell voltage of battery pack B reaches 4.6V. The charging current of each charging stage is determined, and the time for different battery packs to be connected for charging is determined according to the different voltage values ​​of the single cells of different types of battery packs in different cascade modules.

[0062] It should be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and interpreted scripting language JavaScript, etc.

[0063] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0064] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0065] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0066] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0067] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A charging control method for a battery pack cascade power supply integrated topology, characterized in that: include: Step 1: The controller of the charging system sets the total number of charging stages M and the target charging voltage value U of the jth charging stage. j , Charging current value I j , send a charging start instruction to the level control board of the N-level cascade module; Step 2: The control board of the i-th cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th cascade module, and the battery manager of the i-th cascade module receives the charging start instruction; Step 3: The battery manager of the i-th cascade module detects the voltage value of the single battery of the battery group of the i-th cascade module and sends the voltage value of the single battery back to the control board of the i-th cascade module; Step 4, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller; Step 5: The controller determines whether the voltage value of the single battery of the battery pack of the i-th stage cascade module reaches U j ; If the voltage value of the single battery reaches U j , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ; Step 6, enter the j+1th charging stage, and execute steps 3 to 5; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage. M , the constant current source charger stops outputting current and the charging process ends; The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than I j+1 ; The charging system is based on the battery pack cascade power supply integrated topology, including: N-level cascade modules, inductors, thyristors and capacitors connected in series, and a constant current source charger connected in parallel to the N-level cascade modules connected in series; each level of the cascade module is composed of a battery pack and an IGBT half-bridge connected in series, wherein the IGBT half-bridge is connected to an IGBT driver board, including an IGBT upper tube and an IGBT lower tube, the battery pack is connected to a battery butler, and the battery butler and the IGBT driver board are connected to a level control board; the level control board and the constant current source charger of each level of the cascade module are connected to a controller.

2. The charging control method of the battery pack cascade power supply integrated topology according to claim 1, characterized in that: The IGBT half-bridge of each cascade module consists of an IGBT upper tube and an IGBT lower tube. The positive electrode of the battery pack is connected to the collector of the IGBT upper tube, the emitter of the IGBT upper tube is connected to the collector of the IGBT lower tube, and the emitter of the IGBT lower tube is connected to the negative electrode of the battery pack. The bases of the IGBT upper tube and the IGBT lower tube are connected to the IGBT driver board as control ends. The IGBT upper tube and the IGBT lower tube are respectively composed of an IGBT and a FWD in parallel. The IGBT is an insulated gate bipolar transistor chip, and the FWD is a freewheeling diode chip.

3. The charging control method of the battery pack cascade power supply integrated topology according to claim 1, characterized in that: The N-stage cascade modules are connected in series with the inductor, thyristor and capacitor; the series connection mode of the N-stage cascade modules is: the emitter of the IGBT upper tube of the i-th stage cascade module is connected to the collector of the IGBT upper tube of the i+1-th stage cascade module; the constant current source charger is connected to both ends of the N-stage cascade module as a whole, specifically: the positive electrode of the constant current source charger is connected to the collector of the IGBT upper tube of the 1st stage cascade module, and the negative electrode of the constant current source charger is connected to the emitter of the IGBT upper tube of the N-th stage cascade module; wherein i takes a value from 1 to N-1.

4. The charging control method of the battery pack cascade power supply integrated topology according to claim 1, characterized in that: The controller is a control board based on an ARM controller or a control board based on a DSP.

5. The charging control method of the battery pack cascade power supply integrated topology according to claim 1, characterized in that: The multiple single cells of the battery pack of the i-th stage cascade module are rechargeable batteries of the same type.

6. The charging control method of the battery pack cascade power supply integrated topology according to claim 5, characterized in that: The rechargeable batteries of the same type are lithium iron phosphate batteries, lithium titanate batteries, lead-acid batteries, nickel-cadmium batteries or nickel-metal hydride batteries.

7. A charging control device with a battery pack cascade power supply integrated topology, characterized in that: Includes the following modules: The charging instruction sending module, the controller of the charging system sets the total number of charging stages M, the target charging voltage value U of the jth charging stage j , Charging current value I j , send a charging start instruction to the level control board of the N-level cascade module; A charging instruction forwarding module, wherein the level control board of the i-th level cascade module receives the charging start instruction and sends the charging start instruction to the battery manager of the i-th level cascade module, and the battery manager of the i-th level cascade module receives the charging start instruction; The voltage value detection module, the battery manager of the i-th level cascade module detects the voltage value of the single battery of the battery group of the i-th level cascade module and sends the voltage value of the single battery back to the level control board of the i-th level cascade module; The voltage value forwarding module, the level control board of the i-th level cascade module sends the voltage value of the single battery of the battery group of the i-th level cascade module to the controller; The charging module controller determines whether the voltage value of the single battery of the battery pack of the i-th cascade module reaches U j ; If the voltage value of the single battery reaches U j , the controller sends an IGBT control signal to the IGBT driver board of the i-th cascade module through the level control board of the i-th cascade module, controls the IGBT upper tube of the IGBT half-bridge in the i-th cascade module to turn on, so as to control the battery pack of the i-th cascade module to cut out of the charging circuit and not charge; if the voltage value of the single battery does not reach U j , the battery pack continues to charge; at the same time, the controller sends a charging current instruction to the constant current source charger in the charging system, so that the constant current source charger outputs I j , charge the battery packs of the cascade modules connected to the charging circuit until the voltage values ​​of the single cells of all battery packs reach U j ; The charging end control module enters the j+1th charging stage and sequentially executes the operations included in the voltage value detection module, the voltage value forwarding module and the charging module; until the voltage values ​​of all single cells reach the target charging voltage value U of the Mth charging stage M , the constant current source charger stops outputting current and the charging process ends; The i-th stage cascade module includes a battery pack and an IGBT half-bridge connected in series; i is a positive integer, and each charging stage has a value from 1 to N; j is a positive integer, and each charging stage has a value from 1 to M, and each charging stage has a value, U j Less than U j+1 , I j Greater than I j+1 ; The charging system is based on the battery pack cascade power supply integrated topology, including: N-level cascade modules, inductors, thyristors and capacitors connected in series, and a constant current source charger connected in parallel to the N-level cascade modules connected in series; each level of the cascade module is composed of a battery pack and an IGBT half-bridge connected in series, wherein the IGBT half-bridge is connected to an IGBT driver board, including an IGBT upper tube and an IGBT lower tube, the battery pack is connected to a battery butler, and the battery butler and the IGBT driver board are connected to a level control board; the level control board and the constant current source charger of each level of the cascade module are connected to a controller.

8. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the charging control method of the battery pack cascade power supply integrated topology as described in any one of claims 1 to 6 are implemented.

9. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the charging control method of the battery pack cascade power supply integrated topology as described in any one of claims 1 to 6 are implemented.

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