Battery system and vehicle
By using n cells of the power battery as a storage battery in new energy vehicles, combined with series connection and load balancing module, the energy loss and space occupation problems when power batteries and storage batteries are combined are solved, and a safer, more reliable and economical power supply system is achieved.
Patent Information
- Application Number
- CN202422828632.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-19
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-11-19
AI Technical Summary
The combination of power batteries and storage batteries in new energy vehicles has problems such as large energy loss, large space occupation and high cost, especially lithium batteries, which require additional battery management system and thermal management system.
Using n cells from the power battery as the storage battery, and through series connection and load balancing module, the power converter realizes the conversion of high voltage and low voltage electrical signals, and the transformer is combined to achieve energy balancing, thus eliminating the need for traditional storage batteries.
It reduces energy loss, saves vehicle cost and space, improves the reliability and convenience of the power supply system, and reduces manufacturing costs.
Smart Images
Figure CN223612571U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of power batteries, vehicles and the like, and in particular to a battery system and a vehicle. BACKGROUND
[0002] With the rapid development of the new energy vehicle industry, new energy vehicle technology is also rapidly updated and iterated. In the traditional fuel vehicle technology, many high-performance chips are added to improve the intelligence and safety of the vehicle. The power battery is the power source of the new energy vehicle, and improving the performance of the power battery is one of the key technologies for the new energy industry. In addition to the power battery that provides power to the motor, the power source of the new energy vehicle also includes a storage battery that provides power to the low-voltage system of the vehicle.
[0003] In related technologies, both a power battery and a storage battery exist in a new energy vehicle. When power is needed for low-voltage devices, the power battery needs to charge the storage battery. When charging, the power battery needs to transmit power to a direct current-to-direct current converter (DC-DC converter), and the DC-DC converter reduces the voltage and then charges the storage battery. The DC-DC converter causes part of the energy to be lost in the middle, and the storage battery occupies a large space. In another related technology, the type of the storage battery is gradually developed from a lead-acid battery to a lithium battery to reduce weight and improve energy density. However, the lithium battery has active chemical properties, and needs to be equipped with a battery management system and a thermal management system, greatly increasing the manufacturing cost. UTILITY MODEL CONTENT
[0004] In view of the above problems, the present application provides a battery system and a vehicle, which can reduce cost, reduce energy loss and be more safe and reliable.
[0005] In a first aspect, the present application provides a battery system, which includes: a power battery, the power battery including N battery cells, the N battery cells being connected with high-voltage devices and a power converter, n battery cells in the N battery cells being connected with low-voltage devices as a storage battery, n being less than N; and the power converter being connected with the N battery cells and the low-voltage devices, wherein in a first working state, the high-voltage devices are powered by high-voltage signals of the N battery cells, and the low-voltage devices are powered by low-voltage signals converted from the high-voltage signals of the N battery cells by the power converter; and in a second working state, the low-voltage devices are powered by low-voltage signals of the n battery cells.
[0006] In the technical scheme of the embodiment of the application, n battery cells in the power battery are used to serve as the storage battery to provide low-voltage power for the whole vehicle, and the traditional storage battery is abandoned, thereby saving the cost of the whole vehicle and the maintenance cost of the device, saving the space of the whole vehicle, reducing the weight of the whole vehicle, and improving the output capacity. Moreover, the power battery can directly supply power to the high-voltage device, and compared with the related art, the power battery in the application can also supply power to the low-voltage device after being converted into a low-voltage signal by the power converter, and the power battery does not need to charge the storage battery through the DCDC and then supply power to the low-voltage device by the storage battery, thereby reducing the energy loss of the power in the transmission process and being more safe and reliable.
[0007] In some embodiments, the N battery cells are connected in series, and the n battery cells are connected in series.
[0008] In the technical scheme of the embodiment of the application, the battery cells are connected in series, thereby reducing the complexity of the circuit, reducing the hardware cost, and being easier to realize in actual application.
[0009] In some embodiments, the n battery cells are the battery cells that are continuously connected in the N battery cells.
[0010] In the technical scheme of the embodiment of the application, the n battery cells are selected from the battery cells that are continuously connected in the N battery cells, thereby ensuring the reliability of the power supply system and being more convenient in actual application, and facilitating the unified management of the battery management module.
[0011] In some embodiments, the battery system further comprises a load balancing module, the load balancing module is connected with at least one battery cell in the (N-n) battery cells, and the load balancing module is also connected with at least one battery cell in the n battery cells, wherein the (N-n) battery cells are the battery cells other than the n battery cells in the N battery cells, and at least one battery cell in the (N-n) battery cells charges at least one battery cell in the n battery cells through the load balancing module.
[0012] In the technical scheme of the embodiment of the application, the load balancing module contains a transformer, when the voltage of the battery cell serving as the storage battery is low due to discharge, the battery cell with high voltage charges the transformer, and the transformer charges the battery cell serving as the storage battery after charging is completed, so that the voltages of all the battery cells are maintained consistent, thereby realizing energy transfer.
[0013] In some embodiments, the (N-n) battery cells are divided into n groups, each group of battery cells corresponds to a load balancing module, each group of battery cells corresponds to one battery cell in the n battery cells, and each group of battery cells charges the corresponding battery cell through the corresponding load balancing module.
[0014] In the technical scheme of the embodiment of the present application, each group of battery cells charges corresponding battery cells through the respective load balancing module, the modules do not affect each other, and in actual application, the load balancing of the specified battery cells can be flexibly performed according to the requirement, which is more convenient.
[0015] In some embodiments, the battery cells contained in each group of battery cells are the continuously connected battery cells in the N battery cells.
[0016] In the technical scheme of the embodiment of the present application, when the other N-n battery cells in the power battery are charged as the battery cells of the storage battery, the continuously connected battery cells in the N-n battery cells are selected as a group to charge one battery cell, which is more convenient in management, the circuit is simpler, the cost can be reduced, and the reliability of the power supply system can be ensured.
[0017] In some embodiments, the load balancing module includes an energy storage component, at least one battery cell in the (N-n) battery cells transfers energy to the energy storage component for storage, and the energy storage component transfers the stored energy to at least one battery cell in the n battery cells to complete charging.
[0018] In the technical scheme of the embodiment of the present application, the energy storage component can store part of the energy of the battery cell with high voltage, thereby charging the battery cell as the storage battery, and the consistency of the voltages of all battery cells can be achieved.
[0019] In some embodiments, each group of battery cells and the corresponding battery cell are connected with the load balancing module through a general switch, each battery cell in each group of battery cells is connected with the load balancing module through a corresponding first secondary switch, and one battery cell in the n battery cells corresponding to each group of battery cells is connected with the load balancing module through a corresponding second secondary switch.
[0020] In the technical scheme of the embodiment of the present application, the connection of the battery cell and the load balancing module can be controlled through the general switch, the (N-n) battery cells and the n battery cells each correspond to a separate secondary switch, which can be independently controlled according to the actual requirement, is more convenient and flexible, and is easy to manage.
[0021] In some embodiments, the battery system further includes a battery management module, the battery management module is electrically connected with the general switch, the first secondary switch and the second secondary switch, in the case of transferring the energy of each group of battery cells to the load balancing module, the battery management module controls the general switch and the first secondary switch to be closed, and controls the first secondary switch to be opened after the energy transfer is completed; in the case of transferring the energy of the load balancing module to one battery cell in the n battery cells corresponding to each group of battery cells, the battery management module controls the general switch to remain closed and controls the second secondary switch to be closed, and controls the general switch and the second secondary switch to be opened after the energy transfer is completed.
[0022] The technical scheme of the embodiment of the application is characterized in that when the battery cell serving as the storage battery needs to be charged, the battery management module controls the load balancing module through the switching device, so as to keep the voltages of all the battery cells consistent, and the battery management module can flexibly control the on-off of the circuit, and is more convenient and efficient.
[0023] In some embodiments, the battery management module comprises a voltage sampling chip, the voltage sampling chip is electrically connected with at least one of the n battery cells, and the voltage sampling chip is configured to collect voltage data of the at least one of the n battery cells, so as to control at least one of the (N-n) battery cells to charge the at least one of the n battery cells through the load balancing module based on the collected voltage data.
[0024] In the technical scheme of the embodiment of the application, the battery management module collects voltage data of the battery cell serving as the storage battery through the voltage sampling chip, and when the voltage difference between the voltage data and the (N-n) battery cells is greater than a threshold value, the battery management module controls the load balancing module through the switching device to charge the n battery cells, and the voltage sampling chip collects actual application data to provide conditions for load balancing operation of the battery system.
[0025] In some embodiments, the energy storage component comprises a transformer.
[0026] In the technical scheme of the embodiment of the application, when the voltage of the (N-n) battery cell is high, the energy of the battery cell is transferred to the transformer, and the transformer indirectly provides energy to the n battery cell to increase the voltage. In the above-mentioned mode, part of the energy is stored in the transformer, the (N-n) battery cell charges the n battery cell, and the voltages of the same balancing module are kept consistent.
[0027] On the other hand, the application provides a vehicle capable of realizing the battery system, the high-voltage device and the low-voltage device of any one of the above-mentioned embodiments.
[0028] The above description is only a summary of the technical scheme of the application, in order to more clearly understand the technical means of the application, the specific embodiments of the application can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the application more obvious and easy to understand, the following specific embodiments of the application are described. BRIEF DESCRIPTION OF DRAWINGS
[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of preferred embodiments, and are not meant to limit the application. Moreover, the same reference numerals in all the drawings represent the same or similar elements. In the drawings:
[0030] Figure 1A battery system structure schematic diagram provided for an embodiment of the present application is shown in FIG. 1.
[0031] Figure 2 A high and low voltage power supply table of a whole vehicle in different working conditions of an embodiment of the present application is shown in FIG. 2.
[0032] Figure 3 A whole diagram of a battery system in which n battery cells in a power battery serve as an accumulator is shown in FIG. 3.
[0033] Figure 4 A battery system structure schematic diagram provided for another embodiment of the present application is shown in FIG. 4.
[0034] Figure 5 An active equalization structure diagram of a group of battery cells based on a transformer in an embodiment of the present application is shown in FIG. 5. DETAILED DESCRIPTION
[0035] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.
[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion.
[0037] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.
[0038] Reference to "an embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0039] In the description of the embodiments of the present application, the term "and / or" is merely an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are an "or" relationship.
[0040] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).
[0041] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.
[0042] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.
[0043] With the rapid development of the new energy automobile industry, the new energy automobile technology is also rapidly updated and iterated. On the basis of traditional fuel vehicle technology, many high-performance chips are added to improve the intelligence and safety of the whole vehicle. The power battery is the power source of the new energy automobile, and improving the performance of the power battery is one of the key technologies for the new energy industry. In addition to the power battery that provides power to the motor, the power source of the new energy automobile also includes the storage battery that provides power to the low-voltage system of the whole vehicle.
[0044] In the related art, the power battery and the storage battery exist in the new energy vehicle at the same time. When the low-voltage device needs to be powered, the power battery needs to charge the storage battery. When charging, the power battery needs to transmit power to the direct current-direct current converter (DC-DC converter). The DC-DC converter reduces the voltage and then charges the storage battery. The intermediate DC-DC causes part of the energy loss, and the storage battery occupies a large space. In another related technology, the selection of the storage battery gradually develops from the lead-acid battery to the lithium battery to reduce the weight and improve the energy density. However, the lithium battery has active chemical properties, and needs to be equipped with a battery management system and a thermal management system, which greatly increases the manufacturing cost.
[0045] In view of the above problems, the present application provides a battery system which can reduce cost, reduce energy loss and be more safe and reliable.
[0046] Figure 1 The battery system structure schematic diagram provided for the embodiments of the present application is shown in Figure 2 The battery system structure schematic diagram provided for the embodiments of the present application is shown in
[0047] The battery system includes a power battery, the power battery includes N battery cells, the N battery cells are connected with high-voltage devices and a power converter, n battery cells in the N battery cells are connected with low-voltage devices as storage batteries, and n is less than N; the power converter is connected with the N battery cells and the low-voltage devices, wherein in a first working state, the high-voltage devices are powered by high-voltage signals of the N battery cells, and the low-voltage devices are powered by low-voltage signals converted from the high-voltage signals of the N battery cells by the power converter; in a second working state, the low-voltage devices are powered by low-voltage signals of the n battery cells.
[0048] Exemplarily, as shown in Figure 1 The battery system includes a power battery 10, and the power battery 10 includes N battery cells, i.e. (N-n) battery cells 11 and n battery cells 12. The (N-n) battery cells are battery cells other than the n battery cells in the N battery cells, and the n battery cells are part of the N battery cells. The n battery cells are directly connected with the low-voltage devices 40 as storage battery parts, and the N battery cells are directly connected with the high-voltage devices 20. The N battery cells supply power to the low-voltage devices 40 by converting high-voltage signals to low-voltage signals through the power converter 30.
[0049] For example, as shown in Figure 2As shown, the power battery provides a power source for the vehicle. When the vehicle is in a charging and discharging state (a first working state), the power battery (N battery cells) supplies power to high-voltage devices. When the power battery (N battery cells) supplies power to low-voltage devices, the DCDC converts the high-voltage signal from the N battery cells into a low-voltage signal, and the low-voltage signal supplies power.
[0050] In the technical solution of the embodiment of the application, n battery cells in the power battery are used as a storage battery to provide low-voltage power for the vehicle, and the traditional storage battery is abandoned. The vehicle cost and device maintenance cost are saved, the vehicle space is saved, the vehicle weight is reduced, and the output capacity is improved. In addition, the power battery can directly supply power to high-voltage devices. Compared with the related art, the power battery in the application can also supply power to low-voltage devices by converting the low-voltage signal through the power converter. The power battery does not need to charge the storage battery through the DCDC, and the storage battery supplies power to the low-voltage devices. The energy loss in the transmission process of the power is reduced, and the safety and reliability are improved.
[0051] In the above battery system, the N battery cells are connected in series, and the n battery cells are connected in series. The n battery cells are the battery cells that are continuously connected in the N battery cells.
[0052] Figure 3 A whole diagram of the power battery in which the n battery cells act as a storage battery system is shown.
[0053] Exemplarily, as shown in Figure 3 As shown, the N battery cells in the power battery are connected in series to output a high-voltage signal in the first working state. The battery cells in the shaded part are the n battery cells selected from the N battery cells to act as a storage battery. The n battery cells are also connected in series to act as a storage battery.
[0054] In another example, the n battery cells can further be the battery cells that are continuously connected.
[0055] In the technical solution of the embodiment of the application, the battery cells are connected in series to reduce the complexity of the circuit and reduce the hardware cost, which is easier to implement in actual application. In addition, the n battery cells are selected from the battery cells that are continuously connected in the N battery cells, which can ensure the reliability of the power supply system and is more convenient in actual application, and the battery management module can be uniformly managed.
[0056] The battery system further comprises a load balancing module connected with at least one of the (N-n) battery cells and at least one of the n battery cells, wherein the at least one of the (N-n) battery cells charges the at least one of the n battery cells through the load balancing module.
[0057] Figure 4 A battery system structure diagram is provided for another embodiment of the application.
[0058] As shown in the example, Figure 4 As shown in the example, Figure 1 Based on the example shown, the battery system further comprises a battery management module 50 and a load balancing module, the battery management module 50 is used to control the load balancing process of the load balancing module. The load balancing module can comprise an equalization circuit 13 connected with the (N-n) battery cells and the n battery cells respectively, and through the equalization circuit, the (N-n) battery cells charge the n battery cells.
[0059] In the technical solution of the embodiment of the application, the load balancing module contains a transformer, when the battery cell acting as a storage battery has a low voltage due to discharge, the battery cell with a high voltage charges the transformer, and after the transformer is fully charged, the battery cell acting as a storage battery is charged, so that the voltages of all the battery cells are maintained consistent, thereby realizing energy transfer.
[0060] In another example, the (N-n) battery cells are divided into n groups, each group of battery cells corresponds to a load balancing module, each group of battery cells corresponds to one of the n battery cells, and each group of battery cells charges the corresponding battery cell through the corresponding load balancing module. Figure 5 A process in which one group of battery cells actively balances a battery cell acting as a storage battery is shown. In another example, the battery cells contained in each group of battery cells are consecutive battery cells in the N battery cells.
[0061] Figure 5 A structure diagram of actively balancing battery cells based on a transformer for one group of battery cells in an embodiment of the application is shown.
[0062] As shown in the example, Figure 5 As shown in the example, the (N-n) battery cells are divided into n groups, each group in the n groups comprises (N-n) / n battery cells for example, N1, N2, N3…N (N-n) / n For (N-n) / n battery cells in one group of battery cells, n i The (N-n) / n battery cells are responsible for charging the i-th battery cell acting as a storage battery through the corresponding load balancing module.
[0063] For example, taking N=100 and n=10 as an example, the last 10 cells are selected as the battery, when the voltage of the nth1 cell is low (i.e. the N-n+1 cell, n1 is the 91st cell), the first group of cells including (N-n) / n=9 cells (the first 9 cells) will indirectly provide energy to the cell n1 through the transformer; the second group of cells including (N-n) / n cells (the first 10-18 cells) will indirectly provide energy to the cell n2=92 through the transformer, the ith group of cells including (N-n) / n cells will indirectly provide energy to the cell n i to achieve the same voltage of each cell.
[0064] In the technical solution of the embodiment of the application, each group of cells is charged by the corresponding load balancing module, and the modules do not affect each other, so that the specified cells can be flexibly balanced in actual application, which is more convenient. When the other N-n cells in the power battery are charged as the battery cells, the continuous cells in the N-n cells are selected as a group to charge one cell, which is more convenient in management, the circuit is simpler, the cost can be reduced, and the reliability of the power supply system can be ensured.
[0065] The load balancing module includes an energy storage component, at least one of the (N-n) cells transfers energy to the energy storage component for storage, and the energy storage component transfers the stored energy to at least one of the n cells to complete charging. The energy storage component includes a transformer.
[0066] For example, as shown in Figure 5 , T is a transformer in the figure, N1, N2, N3…N (N-n) / n are (N-n) / n cells in a group of cells, n i is the ith cell that needs to be charged as a battery cell, when n i When the discharge voltage is low, at least one of the (N-n) cells (such as N1, N2, N3…N (N-n) / n ) transfers energy to the transformer T, and the transformer T transfers energy to n i to achieve charging of the battery cell.
[0067] In the technical solution of the embodiment of the application, the energy storage component can store part of the energy of the cell with high voltage, so as to charge the cell as a battery. When the voltage of the (N-n) cell is high, part of the energy of the cell is transferred to the transformer, and then the transformer indirectly provides energy to the n cell to improve the voltage. In the above-mentioned manner, part of the energy is stored by the transformer, and the (N-n) cell charges the n cell, so as to keep the voltage of the same balancing module consistent.
[0068] Each group of battery cells and its corresponding single cell are connected to the load balancing module via a main switch. Each single cell in each group of battery cells is connected to the load balancing module via a corresponding first or second-level switch. One single cell in each group of battery cells is connected to the load balancing module via a corresponding second or second-level switch.
[0069] For example, such as Figure 5 As shown in the diagram, S is the main switch, S1 is the first-level switch, S2 is the second-level switch, and N1, N2, N3…N… (N-n) / n For a group of (Nn) / n cells, n i The i-th cell, N1, N2, N3…N, which acts as a battery and requires charging, is an example of a battery that needs charging. (N-n) / n With n i Connected to transformer T via main switch S, N1, N2, N3…N (N-n) / n Connected to transformer T via first and second stage switches S1 respectively, n i It is connected to transformer T via the second-level switch S2.
[0070] In the technical solution of this application embodiment, the connection between the battery cell and the load balancing module can be controlled by the main switch. The (Nn) battery cell and the n battery cell each correspond to a separate secondary switch, which can be independently controlled according to actual needs, without being affected by other circuits, making it more convenient, flexible and easy to manage.
[0071] The battery system also includes a battery management module, which is electrically connected to the main switch, the first secondary switch, and the second secondary switch. When it is necessary to transfer the energy of each group of cells to the load balancing module, the battery management module controls the main switch and the first secondary switch to close, and controls the first secondary switch to open after the energy transfer is completed. When it is necessary to transfer the energy of the load balancing module to one cell among the n cells in each group of cells, the battery management module controls the main switch to remain closed and controls the second secondary switch to close, and controls the main switch and the second secondary switch to open after the energy transfer is completed.
[0072] For example, such as Figure 5 As shown, when the battery cell acting as a storage battery has a low discharge voltage, the battery management module controls the main switch S to close, and closes the cells N1 to N2. (N-n) / n The corresponding first and second stage switches S1, and other high-voltage cells N1 to N (N-n) / n After charging the transformer, the cells N1 to N2 need to be disconnected. (N-n) / n The corresponding first and second stage switches S1. After the transformer finishes charging, the battery cell n, which acts as a storage battery, needs to be charged. i While charging, keep the main switch S closed and close n. iThe corresponding second secondary switch S2, the energy stored by the transformer is transferred to the selected low-voltage battery cell through the winding, so that the voltage of all battery cells is kept consistent after a period of time under the condition of single battery power supply.
[0073] In the technical scheme of the embodiment of the application, when the battery cell serving as the battery needs to be charged, the battery management module controls the load balancing module through the switching device, so that the voltages of all battery cells are kept consistent, and the on-off of the circuit can be flexibly controlled through the battery management module, which is more convenient and efficient.
[0074] The battery management module includes a voltage sampling chip, the voltage sampling chip is electrically connected with at least one battery cell of the n battery cells, and the voltage sampling chip is configured to collect voltage data of the at least one battery cell, so as to control at least one battery cell of the (N-n) battery cells to charge at least one battery cell of the n battery cells through the load balancing module based on the collected voltage data.
[0075] For example, the voltage sampling chip collects the voltage of the battery cell serving as the battery, when the voltage difference between the n battery cells and the (N-n) battery cells is greater than a certain threshold, the power management module starts the active balancing circuit, indirectly supplies power to the battery cell serving as the 12V battery based on the energy stored by the transformer, so as to maintain the voltage consistency of all battery cells.
[0076] In the technical scheme of the embodiment of the application, the battery management module collects the voltage data of the battery cell serving as the battery through the voltage sampling chip, when the voltage difference between the voltage data and the (N-n) battery cells is greater than a threshold, the battery management module controls the load balancing module through the switching device to charge the n battery cells, and the voltage sampling chip collects the actual application data to provide conditions for the operation of the battery system.
[0077] The battery system of the application removes the traditional battery, highly integrates the power battery and the battery, uses the n battery cells in the power battery as the battery when the battery needs to be powered, uses the DCDC to supply power to the low-voltage device when the vehicle is in the discharging and charging working condition, uses the n battery cells in the power battery composed of the N series battery cells as the battery when the vehicle is in the sleep working condition, actively balances the n battery cells based on the transformer energy transfer module, keeps the voltage of the same balancing module consistent, and removes the traditional battery. Under the condition that the vehicle can work normally under any working condition.
[0078] The application takes the power battery and storage battery of an electric vehicle as the research object, and establishes a highly integrated system of the power battery and storage battery based on transformer to realize energy transfer and active balancing of the battery cell. The traditional 12V storage battery on the vehicle is removed, and the DCDC is directly used to provide low-voltage power for the vehicle in driving and charging conditions; in the sleep condition, n battery cells in the power battery with N battery cells in series are selected to act as the 12V storage battery and provide low-voltage power for the vehicle, and when the voltage difference between the battery cells is greater than a certain threshold, the active balancing circuit is started, the energy is stored based on the transformer, and the battery cells acting as the 12V storage battery are indirectly powered to maintain the voltage of all battery cells consistent. The integrated system can greatly save the manufacturing cost, reduce the vehicle space occupation and vehicle quality, reduce the energy loss in transmission, and provide the reliability of the high and low voltage systems.
[0079] The embodiment of the application provides a vehicle for realizing the battery system, the high-voltage device and the low-voltage device in any one of the above embodiments.
[0080] The vehicle with the battery system provides power for the DCDC through the power battery during vehicle driving, and uses the DCDC to provide power for the low-voltage device on the vehicle; when the vehicle is charging, the DCDC is powered through the power battery or the on-board charger OBC, and the DCDC is used to provide power for the low-voltage device on the vehicle; when the vehicle is in sleep, the power battery does not need to provide high-voltage power for the vehicle, so the power battery is not used in this condition, and n battery cells in the power battery with N battery cells in series are used to act as the storage battery to replace the traditional 12V storage battery on the vehicle and provide power for the low-voltage device on the vehicle.
[0081] The voltage of the battery cell acting as the storage battery is, for example, 12V, and the positions are continuously connected to ensure the reliability of the power supply system. By removing the traditional battery on the vehicle, the vehicle cost, vehicle space, vehicle weight, and output competitiveness can be greatly saved. The n battery cells are actively balanced based on the load balancing module at a certain voltage difference threshold.
[0082] It is to be appreciated that the logical and / or steps represented in the flow diagrams or otherwise described herein, for example, can be considered as a sequence of executable instructions for implementing the logical function in question, and can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions, or a combination thereof. For purposes of this application, a "computer-readable medium" can be any apparatus that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a product of "transitory fabrication" that can be tangibly embodied in a physical medium of manufacture (e.g., see 35 U.S.C. § 101). The computer-readable medium can be, for example but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection (electronic) having one or more wires, a portable computer diskette (magnetic), a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium can be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example via an optical scanner, then compiled, interpreted, or otherwise processed, and stored in a computer memory in a form that can be later executed by a computer. In this manner, the computer-readable medium can be paper or another suitable medium that can be treated to have a computer readable medium embodied thereon.
[0083] It is to be understood that portions of the application can be implemented with hardware, software, firmware or a combination thereof. In the various embodiments described above, multiple steps or methods can be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any of the following technologies, known in the art, or a combination thereof, can be used: discrete logic circuitry having logic gates for implementing logic functions upon an application of data signals, application specific integrated circuits having appropriate combinational logic gates, programmable gate arrays (PGA), field programmable gate arrays (FPGA), and so forth.
[0084] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A battery system characterized by, The battery system comprises: a power battery comprising N battery cells, the N battery cells being connected with high-voltage devices and a power converter, n battery cells in the N battery cells being connected as accumulators with low-voltage devices, n being less than N; the power converter being connected with the N battery cells and the low-voltage devices, wherein, in a first working state, the high-voltage devices are powered by high-voltage signals of the N battery cells and the low-voltage devices are powered by low-voltage signals converted from the high-voltage signals of the N battery cells by the power converter; in a second working state, the low-voltage devices are powered by low-voltage signals of the n battery cells.
2. The battery system of claim 1, wherein, The N battery cells are connected in series, and the n battery cells are connected in series.
3. The battery system according to claim 1 or 2, characterized by, The n battery cells are the battery cells in the N battery cells that are connected in series.
4. The battery system of any one of claims 1-3, wherein, The battery system further comprises: a load balancing module connected with at least one battery cell in (N-n) battery cells and connected with at least one battery cell in the n battery cells, wherein the (N-n) battery cells are the battery cells in the N battery cells other than the n battery cells, and at least one battery cell in the (N-n) battery cells charges at least one battery cell in the n battery cells through the load balancing module.
5. The battery system of claim 4, wherein, The (N-n) battery cells are divided into n groups, each group of battery cells corresponding to a load balancing module, each group of battery cells corresponding to one battery cell in the n battery cells, and each group of battery cells charging the corresponding battery cell through the corresponding load balancing module.
6. The battery system of claim 5, wherein, The battery cells in each group of battery cells are the battery cells in the N battery cells that are connected in series.
7. The battery system of any of claims 4-6, wherein, The load balancing module comprises an energy storage component, at least one battery cell in the (N-n) battery cells transfers energy to the energy storage component for storage, and the energy storage component transfers the stored energy to at least one battery cell in the n battery cells to complete charging.
8. The battery system of any of claims 5-7, wherein, Each group of battery cells and the corresponding battery cell are connected to the load balancing module through a master switch, each battery cell in each group of battery cells is connected to the load balancing module through a corresponding first secondary switch, and the corresponding battery cell in the n battery cells corresponding to each group of battery cells is connected to the load balancing module through a corresponding second secondary switch.
9. The battery system of claim 8, wherein, The battery system further comprises: a battery management module electrically connected with the master switch, the first secondary switch, and the second secondary switch, in the case of transferring the energy of each group of battery cells to the load balancing module, the battery management module controls the master switch and the first secondary switch to be closed, and controls the first secondary switch to be opened after the energy transfer is completed; in the case of transferring the energy of the load balancing module to the corresponding battery cell in the n battery cells, the battery management module controls the master switch to remain closed and controls the second secondary switch to be closed, and controls the master switch and the second secondary switch to be opened after the energy transfer is completed.
10. The battery system of claim 9, wherein, The battery management module comprises a voltage sampling chip electrically connected with at least one of the n battery cells, and the voltage sampling chip is configured to collect voltage data of at least one of the n battery cells, so as to control at least one of the (N-n) battery cells to charge at least one of the n battery cells through the load balancing module based on the collected voltage data.
11. The battery system of any of claims 7-10, wherein, The energy storage component comprises a transformer.
12. A vehicle characterized by comprising: The vehicle comprises the battery system, the high-voltage device and the low-voltage device according to any one of claims 1-11.