Balancing and capacity measuring integrated equipment of battery pack and control method

Abstract

The invention discloses a balancing and capacity measuring integrated device of a battery pack and a control method, and the device comprises a data collection module which is used for obtaining the parameters of a battery cell in the battery pack; electrical cores in the battery pack are divided into discharging electrical cores and charging electrical cores; the interaction module is used for selecting control parameters corresponding to battery cells in the battery pack; the processing module is used for obtaining state data of the battery pack based on the control parameters and the battery cell parameters; associating a preset corresponding control strategy according to the state data, and generating an associated control signal; the channel driving module is used for connecting at least one discharging battery cell and / or at least one charging battery cell; controlling electric energy to move between the discharging battery cell and the charging battery cell based on the control signal so as to realize charging and full charging and emptying of the battery pack; the beneficial effects are that electric energy is controlled to move between the discharging battery cell and the charging battery cell, so that charging from the battery cell to the battery cell is realized, the waste of energy consumption is reduced, and the timeliness is also improved.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a battery pack balancing and capacity measurement integrated device and a control method. Background Art

[0002] Existing battery pack balancing and capacity measurement all-in-one machines mainly use industrial frequency power supply to charge the battery cells, and then discharge the battery cells to the resistor (PTC or heating wire) to complete a charge and discharge cycle to test the actual remaining capacity of the battery. This method first requires a charge and discharge cycle for a corresponding number of cells based on the number of channels in the device, which consumes a corresponding amount of time. At the same time, the energy in the discharge process is completely lost by the load resistor, and 100% of the battery energy is consumed in vain, resulting in energy waste. Furthermore, existing equipment only charges and discharges one battery cell, and the number of channels is the number of cells that can be operated in one cycle. The total number of cells divided by the number of channels is the number of cycles that need to be performed.

[0003] In terms of timeliness, the test time of a group of power batteries needs to be calculated using the following formula: (charging time + discharging time) * number of cycles; defects that cause low timeliness are eliminated. Summary of the Invention

[0004] In view of the technical deficiencies mentioned in the background art, an object of the embodiments of the present invention is to provide a battery pack balancing and capacity measurement integrated device and control method to improve time efficiency and reduce energy waste.

[0005] To achieve the above objectives, in a first aspect, an embodiment of the present invention provides a battery pack balancing and capacity measurement integrated device, comprising:

[0006] A data acquisition module is used to obtain parameters of cells in the battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells;

[0007] An interaction module, configured to select control parameters corresponding to the battery cells in the battery pack; wherein the control parameters include the battery cell type and corresponding associated charge and discharge balancing data;

[0008] Processing module for:

[0009] Determine the status data of the battery pack based on the control parameters and the battery cell parameters;

[0010] Preset a corresponding control strategy based on the state data, and generate an associated control signal accordingly;

[0011] Channel driver module, used for:

[0012] connecting at least one of the discharging cells and / or at least one of the charging cells;

[0013] Based on the control signal, electric energy is controlled to move between the discharge cell and the charge cell to achieve charging and full and emptying of the battery pack.

[0014] As a preferred implementation of the present application, the battery pack balancing and capacity measurement integrated device further includes a discharge control board; the discharge control board is connected to the processing module, the discharge battery cell is also connected to the input end of the discharge control board, and the output end of the discharge control board is also connected to a corresponding discharge resistor.

[0015] As a preferred implementation of the present application, the channel driving module further provides an externally connected power frequency interface and a half-bridge circuit; wherein the half-bridge circuit is used to realize the power frequency charging and / or power replenishment function of the rechargeable battery cell.

[0016] As a specific implementation of the present application, the status data includes one-to-one test analysis and multi-string to multi-string test analysis;

[0017] The one-to-one test analysis includes the state of the tested battery pack being not full, the state of the tested battery pack being fully charged, and the state of the tested battery pack being discharged;

[0018] The multi-string to multi-string test analysis includes the state of the tested battery pack being charged and the state of the tested battery pack being depleted.

[0019] As a preferred implementation of the present application, the interactive module is also used to display process data, curves, fault status and final results.

[0020] As a preferred implementation of the present application, the data acquisition module is further used to obtain process data of the battery pack when it is fully charged and discharged;

[0021] The processing module is further used to analyze the capacity and internal resistance of the corresponding battery cell according to the process data, and control the charge and discharge cut-off voltages to be consistent to achieve balance among the battery cells.

[0022] As a preferred implementation of the present application, the channel driving module adopts a charge-discharge conversion circuit to control the movement of electric energy between the discharge battery cell and the charge battery cell; wherein, the charge-discharge conversion circuit adopts a push-pull structure, and the push-pull structure includes a deployed peak absorption circuit.

[0023] In a second aspect, an embodiment of the present invention further provides a method for controlling a battery pack balancing and capacity measurement integrated device, which is applied to the battery pack balancing and capacity measurement integrated device described in the first aspect. The method includes:

[0024] Obtaining parameters of cells in a battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells;

[0025] Selecting control parameters in the battery pack; wherein the control parameters include battery cell type and corresponding associated charge and discharge balancing data;

[0026] Determine the status data of the battery pack based on the control parameters and the battery cell parameters;

[0027] Associating and presetting corresponding control strategies according to the state data, and generating associated control signals accordingly;

[0028] Connect at least one of the discharging cells and / or at least one of the charging cells via a channel driving module;

[0029] Based on the control signal, electric energy is controlled to move between the discharge cell and the charge cell to achieve charging and full and emptying of the battery pack.

[0030] As a preferred implementation of the present application, the channel driving module further provides an externally connected power frequency interface and a half-bridge circuit;

[0031] The method further comprises:

[0032] The half-bridge circuit is used to realize the function of charging and / or replenishing power of the rechargeable battery cell at the industrial frequency.

[0033] As a preferred implementation of the present application, the method further includes:

[0034] Obtain process data of battery pack when it is fully charged and discharged;

[0035] Based on the process data, the capacity and internal resistance of the corresponding battery cells are analyzed, and the charge and discharge cut-off voltages are controlled to be consistent to achieve balance among the battery cells.

[0036] The technical solution provided by the embodiment of the present invention realizes charging of the battery cell to the battery cell by controlling the flow of electric energy between the discharge battery cell and the charge battery cell. While consuming the energy of the discharge battery cell to realize discharge, the charged battery cell is charged at the same time, thereby improving the energy efficiency of the system, recovering part of the battery cell energy and converting it into energy of other batteries, thereby saving energy and reducing energy waste. At the same time, the charge and discharge currents can be flexibly configured by selecting control parameters, making the test more scientific and flexible, and applicable to various battery cells with generally inconsistent charge and discharge capabilities, especially those with smaller capacities.

[0037] Furthermore, compared with the traditional solution, this solution saves discharge cycle time and significantly improves timeliness due to the cross-charging between battery cells. While one side is discharging, the other side is charging at the same time, which overcomes the defects of energy waste and low timeliness in the existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the specific implementation or the description of the prior art.

[0039] Figure 1 This is a principle block diagram of a battery pack balancing and capacity measurement integrated device provided by an embodiment of the present invention;

[0040] Figure 2 This is a connection diagram of a battery pack balancing and capacity measurement integrated device provided by an embodiment of the present invention;

[0041] Figure 3 This is a schematic diagram of energy flow in a channel provided by an embodiment of the present invention;

[0042] Figure 4 This is a connection diagram of a spike absorption circuit provided by an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of a working process provided by an embodiment of the present invention;

[0044] Figure 6 This is a flow chart of a control method for a battery pack balancing and capacity measurement integrated device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0047] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0048] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment," "in an embodiment," "an example," or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combinations and / or subcombinations in one or more embodiments or examples.

[0049] It should be noted that, unless otherwise specified, the technical terms in this embodiment have the common meanings understood in the relevant technical field.

[0050] Please refer to Figures 1 to 3 An embodiment of the present invention provides a battery pack balancing and capacity measurement integrated device, comprising:

[0051] A data acquisition module is used to obtain parameters of cells in the battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells;

[0052] An interaction module, configured to select control parameters corresponding to the battery cells in the battery pack; wherein the control parameters include the battery cell type and corresponding associated charge and discharge balancing data;

[0053] Processing module for:

[0054] Determine the status data of the battery pack based on the control parameters and the battery cell parameters;

[0055] Preset a corresponding control strategy based on the state data, and generate an associated control signal accordingly;

[0056] Channel driver module, used for:

[0057] connecting at least one of the discharging cells and / or at least one of the charging cells;

[0058] Based on the control signal, electric energy is controlled to move between the discharge cell and the charge cell to achieve charging and full and emptying of the battery pack.

[0059] During implementation, the cell parameters include corresponding discharge cell voltage, charge cell voltage, discharge cell current, and charge cell current;

[0060] The interactive module may adopt a touch screen;

[0061] The control parameters include configurable parameters such as charge and discharge current, charge and discharge cut-off voltage, and allowable value of battery cell capacity; the charging mode configuration and battery type can be configured to be compatible with battery packs and battery cell (battery) types (ternary lithium, iron lithium, sodium battery, nickel cadmium, nickel metal hydride, etc.) with different voltages and different characteristics.

[0062] The processing module can determine the number of cells connected to the channel driving module based on the control parameters and cell parameters and the relevant voltage data; whether it is one-to-one or multi-string to multi-string, thereby obtaining status data;

[0063] At the same time, the channel driving module adopts a charge-discharge conversion circuit to control the movement of electric energy between the discharge cell and the charge cell; wherein the charge-discharge conversion circuit adopts a push-pull structure, and the push-pull structure includes a deployed peak absorption circuit.

[0064] The controlled electric energy moves between the discharge cell and the charging cell, that is, the discharge cell is used to charge the charging cell, thereby recovering part of the cell energy, thereby achieving energy saving and time efficiency improvement; this embodies the design concept of the present invention of using cell to charge cell; it should be noted that the discharge cell and the charging cell are not fixed, and will undergo corresponding conversion according to the working process.

[0065] When used, the discharge cells and the charging cells may not appear at the same time; for example, only one string of discharge cells may be connected to discharge the resistor, or only one string of charging cells may be connected to charge from the industrial frequency power supply;

[0066] In this embodiment, the processing module includes a control board and a signal acquisition relay board; wherein, the control board is jointly implemented by a single-chip microcomputer and a field programmable gate array, and the single-chip microcomputer is responsible for human-computer interaction management, control parameter configuration, and data flow control, storage, external communication and other functions; the field programmable gate array is responsible for test process control, high-speed sampling of analog quantities, limit monitoring and protection action control, data calculation, high-speed storage and other tasks.

[0067] During operation, the data acquisition module is further used to obtain process data of the battery pack when it is fully charged and discharged; the processing module is further used to analyze the capacity and internal resistance of the corresponding battery cell based on the process data, and control the charge and discharge cut-off voltages to be consistent to achieve balance of each battery cell;

[0068] That is, when testing the capacity, the battery cell under test is fully charged and then discharged, and the voltage and current parameters are collected during the process, and the battery cell capacity is accumulated, and parameters such as the battery cell internal resistance are calculated; the balancing logic is to allow all battery cells to eventually reach a consistent voltage, such as fully charging them to a specified voltage, or conversely, discharging them to a preset consistent voltage.

[0069] When applied, the channel driver module includes multiple channel driver boards, one channel driver board corresponds to one physical channel, and the number of channels of the finished device can be flexibly configured as needed. Each physical channel can also be compatible with charging one battery cell to one battery cell, charging two series-connected batteries to two series-connected batteries, or charging more series-connected batteries through one physical channel to improve test efficiency. Each physical channel adopts an isolation design to enable the charging and discharging test to be completed in the original series state of the power battery pack.

[0070] It should be noted that, in this embodiment, string refers to when the number of cells driven to charge or discharge by one channel is greater than one cell; group refers to the number of cells driven to charge or discharge by all physical channels of the entire device together;

[0071] The following explanation uses a device with 8 physical channels as an example. Assuming that the battery pack under test consists of 100 cells, each physical channel can realize one-to-one charging and discharging, or charging two strings of cells with another two strings of cells, or charging three strings of cells with another three strings of cells, or even charging more strings through one physical channel.

[0072] Furthermore, in order to adapt to different working conditions, the channel driving module also provides an industrial frequency interface and a half-bridge circuit connected to the outside; wherein, the half-bridge circuit is used to realize the industrial frequency charging and / or replenishing function of the rechargeable battery cell; when applied, the half-bridge circuit is only one of the optional circuits, and a full-bridge circuit and a push-pull circuit can also be used, which is not limited here.

[0073] That is, the channel driver board includes a cell-to-cell charging conversion circuit and a half-bridge circuit for power frequency-to-cell charging conversion; wherein, the cell-to-cell charging conversion circuit adopts a push-pull structure, and a corresponding peak absorption circuit is deployed to address the peak voltage problem of the push-pull circuit; as well as necessary analog sampling circuits and comparison and judgment circuits. The channel driver board receives a control signal from the control board and moves energy from one cell to another, or moves energy from the power frequency power supply to the cell, or simultaneously moves energy from one cell and the power frequency power supply to another cell. It is also possible to choose to use two strings of cells to charge another two strings of cells, or even interoperate between more strings of cells; there is no restriction here.

[0074] Reference Figure 4 The peak absorption circuit includes an upper arm absorption circuit and a lower arm absorption circuit; the upper arm absorption circuit includes an upper arm absorption resistor R1, an upper arm absorption capacitor C1, an upper arm absorption inductor L2 and an upper arm absorption diode D2; the lower arm absorption circuit includes a lower arm absorption resistor R2, a lower arm absorption capacitor C4, a lower arm absorption inductor L1 and a lower arm absorption diode D1;

[0075] Its working principle is:

[0076] When the switch tube (IGBT or MOS, Figure 4 Q1 and Q2 in the circuit are turned from on to off. When the magnetic core leakage energy begins to release, the capacitor begins to absorb the leakage energy, and the resistor is responsible for discharging the capacitor energy to the power supply ground. When the voltage is higher than the power supply voltage by more than 0.7V, the diode is turned on and the leakage energy is fed back to the power supply through the inductor, thereby recovering as much leakage energy as possible. The peak absorption capacitor capacity should not be too high to prevent excessive current when the push-pull switch is turned on.

[0077] This circuit also allows the control of the switch on time by sampling the peak absorption capacitor voltage, so that the drain voltage will not be too high and the conduction current will be too large. This experimental circuit can control the peak within 30V, which can effectively prevent the breakdown of the 40V specification switch tube; and in addition to the peak absorption circuit, the two secondary output coils of the push-pull circuit are rectified by the diode to output the differential current to the battery cell to achieve charging. The entire push-pull circuit is driven and controlled by the field programmable gate array, so that the hybrid control of variable frequency control and pulse width control can be flexibly used as needed.

[0078] The battery pack balancing and capacity measurement integrated device also includes a discharge control board; the discharge control board is connected to the processing module, the discharge battery cell is also connected to the input end of the discharge control board, and the output end of the discharge control board is also connected to a corresponding discharge resistor.

[0079] In this embodiment, refer to Figure 5 The status data includes one-to-one test analysis and multi-string to multi-string test analysis; thereby determining the test requirement analysis through the status data; in this embodiment, the one-to-one test analysis corresponds to the accurate evaluation of the battery cell capacity, and the multi-string to multi-string test analysis corresponds to the battery pack maintenance and balancing;

[0080] The one-to-one test analysis includes the state of the tested battery pack being not full, the state of the tested battery pack being fully charged, and the state of the tested battery pack being discharged;

[0081] The multi-string to multi-string test analysis includes the state of the tested battery pack being charged and the state of the tested battery pack being depleted.

[0082] Specifically, when the battery pack under test is not full (or when accurate measurement of the cell capacity is required), the corresponding control strategy is:

[0083] First, the first group of 8 cells is used to discharge the other cells until the first group of cells reaches the empty standard. Then, the remaining cells are charged with the industrial frequency power supply until all reach the full standard. Then, the fully charged cells are used to charge the first group of empty cells (the charging current due to efficiency loss is supplemented synchronously or asynchronously by the industrial frequency power supply, and can also be set not to be supplemented) until all the discharged cells are empty and all the charged cells are full. The process data is collected, the cell capacity and internal resistance are analyzed, and the charge and discharge cut-off voltage is controlled to be consistent to achieve balance of each cell. This is one cycle, and the next cycle is completed continuously until all are completed.

[0084] When the battery pack is fully charged (or not fully charged, which is only used for balancing or roughly evaluating the cell capacity, applicable to most maintenance scenarios), the corresponding control strategy is:

[0085] The first group of eight cells is discharged through the configured discharge resistor until they are empty. Then, another group of eight fully charged cells is charged to the first group of empty cells until the discharged cells are empty and the charged cells are full. Process data is collected, and the cell capacity and internal resistance are analyzed. The charge and discharge cut-off voltages are controlled to achieve consistency and balance among the cells. This completes one cycle, and the remaining cycles are repeated until all cells are evaluated.

[0086] When the battery pack under test is in the empty state, the corresponding control strategy is:

[0087] Fully charge the first group of 8 cells using the power frequency, then discharge the remaining cells until the first group is empty and the charging group is fully charged. Collect process data, analyze the cell capacity and internal resistance, and control the charge and discharge cut-off voltages to achieve uniformity among the cells. This constitutes one cycle, and the remaining cycles are completed sequentially until all cells are evaluated.

[0088] Similarly, when the battery pack under test is in a charged state, the corresponding control strategy can refer to the solution for the fully charged state of the battery pack under test. The difference between the two is that in the one-to-one test analysis, each channel is charged one-to-one, while in the multi-string to multi-string test analysis, each channel is charged multiple-to-multi-pairs.

[0089] When the battery pack under test is in a low-power state, the corresponding control strategy can refer to the solution when the battery pack under test is in an empty state. The difference between the two is that in one-to-one test analysis, each channel is charged one-to-one, while in multi-string to multi-string test analysis, each channel is charged multiple-to-multiple pairs.

[0090] It can be seen that compared with the system that simply relies on discharging to the resistor, this solution charges the battery cell by charging the battery cell, consuming the energy of the power supply cell to achieve discharge while charging the charged cell, thereby improving the system energy efficiency and reducing energy consumption; the charge and discharge currents can be flexibly configured by controlling the parameter configuration, which can be consistent or different, and can be applicable to various battery cells with generally inconsistent charge and discharge capabilities, especially those with smaller capacities; the charging current lost due to conversion efficiency can be supplemented by the power frequency power supply, and when there is a conflict in the charge and discharge current parameter configuration, the lower current parameter is used; when the discharged cell is empty, if the charging cell is not yet fully charged, the power frequency will continue to charge the charging cell according to the parameter closest to the charging setting until it is fully charged to the preset voltage;

[0091] Compared with the traditional system, this solution is equivalent to saving discharge cycle time, because the battery cells are charged in pairs, and one side is discharged while the other side is charged, which significantly improves the timeliness. At the same time, the control system parameters can be configured to constant current charging, constant current first and then constant voltage charging, constant current and constant voltage conversion voltage and other parameters can be configured, making the test more scientific and flexible.

[0092] Compared with traditional systems, this solution can realize single charging (power frequency charging) and single discharging (resistance discharging) for one battery cell in each physical channel, and can also realize that each physical channel can discharge one battery cell and charge another battery cell simultaneously (pair charging). It can further realize that two strings of battery cells charge another two strings of battery cells, and more strings of battery cells charge another string of the same number of battery cells. For the maintenance and repair of power battery packs, the time consumption can be greatly shortened under the premise of the same number of channels and the same charge and discharge current capabilities. And when necessary, one physical channel can also perform power frequency charging for a certain number of battery cells.

[0093] When each channel is used for charging multiple strings, it still performs high-sampling-rate detection on the voltage of each cell individually to ensure reliable information about the charge state and internal resistance of each cell in the string, preventing overcharge and over-discharge. When the differences between cells in a string are small, the test results are still accurate. When the differences between cells in a string are large, the battery energy storage capacity can be roughly assessed based on the voltage of each cell. Furthermore, physical channels can be used to perform precise one-on-one testing on questionable cells, allowing for flexible selection between efficiency and accuracy.

[0094] It can more quickly evaluate the balance, capacity, and internal resistance of all cells in the battery pack and achieve automatic balancing (full or empty);

[0095] Under the premise of the same equipment procurement cost, this solution will have higher energy efficiency, faster evaluation speed, wider scope of application (various types of battery cells, various capacity levels, various charging and discharging performances, various uses), more test methods, and higher test accuracy.

[0096] Furthermore, the interactive module is also used to display process data, curves, fault status and final results.

[0097] Furthermore, the device also has a host computer interface to realize data transmission with a PC, and cooperates with dedicated software to further expand the experimental control capabilities and data analysis, collection and storage potential.

[0098] Reference Figure 6 Based on the same inventive concept, an embodiment of the present invention further provides a control method for a battery pack balancing and capacity measurement integrated device, which is applied to the battery pack balancing and capacity measurement integrated device described above, and the method includes the following steps:

[0099] S101, obtaining parameters of cells in a battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells;

[0100] S102, selecting control parameters in the battery pack; wherein the control parameters include battery cell type and corresponding charge-discharge balancing data;

[0101] S103, obtaining status data of the battery pack based on the control parameters and the battery cell parameters;

[0102] S104, associating a preset corresponding control strategy with the state data and generating a related control signal accordingly;

[0103] S105, connecting at least one of the discharging cells and / or at least one of the charging cells through a channel driving module;

[0104] S106 , controlling the movement of electric energy between the discharge cell and the charge cell based on the control signal to achieve charging and full and emptying of the battery pack.

[0105] Furthermore, the battery pack balancing and capacity measurement integrated device further includes a discharge control board, the discharge cell is further connected to the input end of the discharge control board, and the output end of the discharge control board is further connected to a corresponding discharge resistor;

[0106] The channel driving module also provides an externally connected power frequency interface and a half-bridge circuit;

[0107] The method further comprises:

[0108] The half-bridge circuit is used to realize the function of charging and / or replenishing power of the rechargeable battery cell at the industrial frequency.

[0109] The state data includes a battery pack not fully charged state, a battery pack fully charged state, and a battery pack low-charge state; the control strategies corresponding to each state are as described above.

[0110] Furthermore, in another embodiment, the method further includes:

[0111] The method further comprises:

[0112] Obtain process data of battery pack when it is fully charged and discharged;

[0113] Based on the process data, the capacity and internal resistance of the corresponding battery cells are analyzed, and the charge and discharge cut-off voltages are controlled to be consistent to achieve balance among the battery cells.

[0114] It should be noted that for a more specific description of the workflow of the method embodiment, please refer to the aforementioned embodiment of a battery pack balancing and capacity measurement integrated device, which will not be repeated here.

[0115] The entire solution saves a discharge cycle by discharging a full battery cell while simultaneously charging the next string of empty batteries, thus improving timeliness.

[0116] By charging from cell to cell, some cell energy is recovered and converted into energy for other cells, thus achieving energy saving;

[0117] This solution can perform precise testing on individual cells according to the number of physical channels, or it can perform rapid assessments by simultaneously charging and discharging multiple strings of cells through a single physical channel. The assessment result is determined by the smallest cell in the string, and is expected to be effective for battery packs in the early to mid-life cycle, as the number of failed cells is usually limited to a few cells. Preventive assessments of battery packs for maintenance purposes can greatly improve operational efficiency, and if necessary, further precise one-on-one testing can be performed on suspicious cells. The number of operating cycles (number of operation cycles) is the total number of cells divided by the number of physical channels and then divided by the number of cell strings, which can be reduced exponentially compared to existing equipment.

[0118] In terms of timeliness, the test time for a group of power batteries requires the following formula to evaluate: charging time * number of cycles + 1 charging time + 1 discharging time; this overcomes the shortcoming of low timeliness of existing solutions.

[0119] In the several embodiments provided in this application, it should be understood that the disclosed integrated device and control method can also be implemented in other ways. The embodiments described above are merely illustrative. For example, each box in the flowchart or block diagram can represent a module, a program segment or a part of a code, and the module, program segment or a part of the code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of boxes in the block diagram and / or flowchart, can be implemented with a dedicated hardware-based system that performs the specified function or action, or can be implemented with a combination of dedicated hardware and computer instructions.

[0120] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0121] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and such modifications or substitutions are intended to be within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of protection of the claims.

Claims

1. A battery pack balancing and capacity measurement integrated device, characterized in that: include: A data acquisition module, used to obtain parameters of cells in a battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells; An interactive module, used to select control parameters corresponding to the battery cells in the battery pack; wherein the control parameters include the battery cell type and corresponding associated charge and discharge balancing data; Processing modules for: Deriving status data of the battery pack based on the control parameters and the battery cell parameters; Preset a corresponding control strategy according to the state data association, and generate an associated control signal accordingly; Channel driver module for: Connecting at least one of the discharging cells and / or at least one of the charging cells; Based on the control signal, electric energy is controlled to move between the discharge cell and the charge cell to realize charging and full and emptying of the battery pack.

2. The battery pack balancing and capacity measurement integrated device according to claim 1, characterized in that: It also includes a discharge control board; the discharge control board is connected to the processing module, the discharge cell is also connected to the input end of the discharge control board, and the output end of the discharge control board is also connected to a corresponding discharge resistor.

3. The battery pack balancing and capacity measurement integrated device as claimed in claim 2, characterized in that: The channel driving module also provides an industrial frequency interface connected to the outside and a half-bridge circuit; wherein the half-bridge circuit is used to realize the industrial frequency charging and / or power replenishment function of the rechargeable battery cell.

4. The battery pack balancing and capacity measurement integrated device as claimed in claim 3, characterized in that: The status data includes one-to-one test analysis and multi-string to multi-string test analysis; The one-to-one test analysis includes the state of the tested battery pack being not full, the tested battery pack being fully charged, and the tested battery pack being discharged; The multi-string to multi-string test analysis includes a charged state of the tested battery pack and a de-charged state of the tested battery pack.

5. A battery pack balancing and capacity measurement integrated device according to any one of claims 1 to 4, characterized in that: The interactive module is also used to display process data, curves, fault status and final results.

6. The battery pack balancing and capacity measurement integrated device as claimed in claim 5, characterized in that: The data acquisition module is also used to obtain process data of the battery pack when it is fully charged and discharged; The processing module is further used to analyze the capacity and internal resistance of the corresponding battery cell according to the process data, and control the charging and discharging cut-off voltages to be consistent, so as to achieve balance of each battery cell.

7. The battery pack balancing and capacity measurement integrated device as claimed in claim 5, characterized in that: The channel driving module adopts a charge conversion circuit to control the movement of electric energy between the discharge battery cell and the charge battery cell; wherein the charge conversion circuit adopts a push-pull structure, and the push-pull structure includes a deployed peak absorption circuit.

8. A control method for a battery pack balancing and capacity measurement integrated device, characterized in that: The method for the battery pack balancing and capacity measurement integrated device according to claim 1 comprises: Obtaining parameters of cells in a battery pack; wherein the cells in the battery pack are divided into discharge cells and charge cells; Selecting control parameters in the battery pack; wherein the control parameters include battery cell types and corresponding associated charge and discharge balancing data; Deriving status data of the battery pack based on the control parameters and the battery cell parameters; Preset a corresponding control strategy according to the state data association, and generate an associated control signal accordingly; Connect at least one of the discharging cells and / or at least one of the charging cells via a channel driving module; Based on the control signal, electric energy is controlled to move between the discharge cell and the charge cell to realize charging and full and emptying of the battery pack.

9. A control method for a battery pack balancing and capacity measurement integrated device as claimed in claim 8, characterized in that: The channel driving module also provides an externally connected power frequency interface and a half-bridge circuit; The method further comprises: The half-bridge circuit is used to realize the function of charging and / or replenishing power for the rechargeable battery cell at industrial frequency.

10. A control method for a battery pack balancing and capacity measurement integrated device as claimed in claim 8 or 9, characterized in that: The method further comprises: Get the process data of battery pack when it is full and empty; According to the process data, the capacity and internal resistance of the corresponding battery cell are analyzed, and the charge and discharge cut-off voltages are controlled to be consistent to achieve balance of each battery cell.

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