Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, and relates to the field of batteries, and the battery device comprises a box body in which a mounting cavity is formed; the plurality of battery modules are arranged in the mounting cavity, the plurality of battery modules comprise a first battery module and a second battery module, the first battery module is a fast charging module, and the energy density of the second battery module is greater than that of the first battery module. Therefore, the first battery module is suitable for being matched with a high-power fast charging pile, the charging time of the battery device can be shortened, the charging efficiency of the battery device can be improved, the waiting time of a user under the charging condition of the battery device can be shortened, the charging convenience of the battery device can be improved, and the problem that the battery device is slow in charging is effectively solved; by arranging the second battery module, the second battery module is used for meeting the long-endurance requirement, the battery device can provide longer endurance for the power utilization device in the working process of the power utilization device, and the problem that the battery device is poor in endurance is effectively solved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery device and an electrical device having the battery device. Background Art

[0002] In the related art, existing battery devices have the problem of slow charging, which causes users to wait for a long time when the battery device is charging, and the battery device also has the problem of poor battery life. Utility Model Content

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present application is to provide a battery device that effectively solves the problems of slow charging and poor battery life of the battery device by providing a first battery module and a second battery module.

[0004] The present application further proposes an electrical device.

[0005] In a first aspect, an embodiment of the present application provides a battery device, comprising:

[0006] A box body, wherein a mounting cavity is formed in the box body;

[0007] A plurality of battery modules, each of the plurality of battery modules being disposed in the mounting cavity, each of the plurality of battery modules including at least one battery cell, the plurality of battery modules including a first battery module and a second battery module, the first battery module having a different charging rate than the second battery module, the first battery module being a fast-charging module, the charging rate of the first battery module being greater than or equal to 1C, and the energy density of the second battery module being greater than the energy density of the first battery module;

[0008] An energy management unit, the energy management unit is connected to both the first battery module and the second battery module, the energy management unit is configured to enable the first battery module to charge the second battery module when the battery device is charging, and when the first battery module is charging the second battery module, the energy management unit is further configured to enable the first battery module to charge the second battery module at the maximum charging rate of the second battery module.

[0009] In the above technical solution, by setting a first battery module, the first battery module is suitable for matching a high-power fast charging pile, which can reduce the charging time of the battery device, improve the charging efficiency of the battery device, reduce the long waiting time of the user when the battery device is charging, improve the charging convenience of the battery device, and effectively solve the problem of slow charging of the battery device. By setting a second battery module, the second battery module is used for long-term battery life requirements. The battery device can provide the power device with longer battery life during operation, effectively solving the problem of poor battery life of the battery device. In addition, the battery device of the present application is provided with a first battery module and a second battery module at the same time, which is conducive to improving the charging speed of the battery device and also to improving the battery life of the battery device, thereby facilitating the same battery device to meet both the charging speed requirements and the battery life requirements. When the first battery module charges the second battery module, the energy management unit is configured to enable the first battery module to charge the second battery module at the maximum charging rate of the second battery module, so that part of the power in the first battery module can be transferred to the second battery module more quickly, which is conducive to completing the charging of the battery device more quickly, improving the charging efficiency of the battery device, and further reducing the waiting time of the user in front of the fast charging pile.

[0010] In some embodiments, the energy management unit is further configured to enable the second battery module to charge the first battery module when the battery device is charged.

[0011] In the above technical solution, the energy management unit is configured to enable the first battery module to charge the second battery module when the battery device is charging, and also to enable the second battery module to charge the first battery module. The energy management unit can charge the first battery module and the second battery module with each other according to the actual charging status of the battery device, and can complete the charging of the battery device as soon as possible, which can further reduce the user's waiting time in front of the fast charging pile, and is more conducive to improving the charging convenience of the battery device and better solving the problem of slow charging of the battery device.

[0012] In some embodiments, when the battery device is discharged, the energy management unit is further configured to enable the first battery module to charge the second battery module.

[0013] In the above technical solution, when the battery device is discharging, the energy management unit is also configured to enable the first battery module to charge the second battery module, which can reduce the amount of electricity stored in the first battery module, which is beneficial to extending the service life of the first battery module, thereby benefiting to extending the service life of the battery device. In addition, the power distribution of the second battery module and the first battery module can be dynamically optimized to reduce the difference between the amount of electricity in the second battery module and the amount of electricity in the first battery module, which is beneficial to keeping the second battery module and the first battery module in the best working state.

[0014] In some embodiments, the energy management unit is disposed within the mounting cavity.

[0015] In the above technical solution, by arranging the energy management unit in the installation cavity, the box can cover the energy management unit, the box can protect the energy management unit, reduce the risk of the energy management unit being damaged, and is more conducive to extending the service life of the battery device.

[0016] In some embodiments, the charge rate of the second battery module is less than 1C.

[0017] In the above technical solution, by making the charging rate of the second battery module less than 1C, the second battery module can be constructed as a slow charging module, which is beneficial to increase the energy density of the second battery module, thereby helping the second battery module to meet the endurance requirements.

[0018] In some embodiments, the battery device is configured so that when connected to a fast charging pile, the first battery module is charged by the fast charging pile.

[0019] In the above technical solution, the battery device is configured so that the first battery module is charged by the fast charging pile when connected to the fast charging pile, which is beneficial to protecting the second battery module, reducing the risk of damage to the second battery module, and improving the service life of the second battery module, thereby improving the service life of the battery device.

[0020] In some embodiments, the first battery module is configured to recover kinetic energy of the electric device during operation, so that the first battery module is charged.

[0021] In the above technical solution, the first battery module is configured to recover the kinetic energy of the electrical device during operation. During the driving of the vehicle, the first battery module can fully recover the recharged amount during the driving of the vehicle, so that the first battery module is charged, which is beneficial to reducing energy consumption losses. Moreover, during the driving of the vehicle, the battery device supplies power to the vehicle, and at the same time, the first battery module is charged, which is beneficial to further improve the endurance of the battery device.

[0022] In some embodiments, the power usage range of the first battery module is greater than or equal to 0% SOC and less than or equal to 80% SOC.

[0023] In the above technical solution, by setting the power usage interval of the first battery module to be greater than or equal to 0% SOC and less than or equal to 80% SOC, the first battery module is charged and discharged within the power usage interval of the first battery module, which is beneficial to maintaining the charging speed of the first battery module, thereby helping to maintain the charging speed of the battery device, and is also beneficial to improving the cycle life of the first battery module, thereby helping to further improve the service life of the battery device.

[0024] In some embodiments, the power usage range of the second battery module is greater than or equal to 20% SOC and less than or equal to 100% SOC.

[0025] In the above technical solution, the power usage interval of the second battery module is greater than or equal to 20% SOC and less than or equal to 100% SOC, and the second battery module is charged and discharged within the power usage interval of the second battery module, which is beneficial to improving the lower discharge limit SOC of the second battery module, and is beneficial to slowing down the decomposition of the anode SEI film of the battery cell in the second battery module, which is beneficial to slowing down the attenuation of the long-term endurance of the second battery module during its life cycle, and is beneficial to improving the endurance of the battery device.

[0026] In a second aspect, an embodiment of the present application provides an electrical device comprising the above-mentioned battery device.

[0027] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0030] Figure 2 is an exploded view of a battery device according to an embodiment of the present application;

[0031] Figure 3 is a block diagram of connections between a first battery module, a second battery module, and an energy management unit according to an embodiment of the present application;

[0032] Figure 4 is a schematic diagram of a battery cell according to an embodiment of the present application.

[0033] Reference numerals:

[0034] Battery device 100;

[0035] Box 10; installation cavity 11; first box 12; second box 13;

[0036] A first battery module 20; a second battery module 30;

[0037] Battery cell 40;

[0038] Energy management unit 60; first charging branch 70; first relay 71; second charging branch 80; second relay 81;

[0039] Vehicle 200 ; controller 201 ; motor 202 . DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0042] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0043] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0044] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0045] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0046] Unless otherwise specified, all embodiments and optional embodiments of the present application can be combined with each other to form a new technical solution.

[0047] Unless otherwise specified, all technical features and optional technical features of this application can be combined with each other to form a new technical solution.

[0048] The term "plurality" used in this application refers to two or more (including two).

[0049] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0050] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0051] The battery cell can be cylindrical, flat, rectangular or other shapes, and the present application embodiment does not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the present application embodiment does not limit this.

[0052] The battery device described in the embodiments of the present application may include multiple battery modules, each configured as a first battery module and a second battery module, for providing voltage and capacity. Each battery module may include at least one battery cell. When a battery module includes multiple battery cells, the multiple battery cells of the battery module are connected in series, parallel, or in parallel via a busbar.

[0053] In some embodiments, a battery module is generally formed by arranging a plurality of battery cells.

[0054] In some embodiments, a battery device includes a housing and a plurality of battery modules, wherein the battery modules are housed in the housing.

[0055] As an example, the battery module may be housed in a box by directly fixing a plurality of battery cells to the box.

[0056] As an example, the housing may include a first housing and a second housing. The first housing and the second housing engage to form a mounting cavity within the housing. The mounting cavity can accommodate multiple battery modules, i.e., multiple battery modules are mounted within the mounting cavity. Enclosed herein means covered or closed, and may be sealed or unsealed. The first housing may be one of the upper housing and the lower housing, and the second housing may be the other of the upper and lower housings.

[0057] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0058] A battery cell consists of a housing, an electrode assembly, and an electrolyte. The housing is used to hold the electrode assembly and electrolyte. The electrode assembly consists of an anode electrode sheet, a cathode electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the anode and cathode electrode sheets. The anode electrode sheet comprises an anode current collector and an anode active material layer. The anode active material layer is coated on the surface of the anode current collector. The anode current collector uncoated with the anode active material layer protrudes from the anode current collector coated with the anode active material layer. The anode current collector uncoated with the anode active material layer serves as the anode tab. For lithium-ion batteries, for example, the anode current collector can be made of aluminum, and the anode active material can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The cathode electrode sheet comprises a cathode current collector and a cathode active material layer. The cathode active material layer is coated on the surface of the cathode current collector. The cathode current collector uncoated with the cathode active material layer protrudes from the cathode current collector coated with the cathode active material layer. The cathode current collector uncoated with the cathode active material layer serves as the cathode tab. The cathode current collector can be made of copper, and the cathode active material can be made of carbon or silicon. In order to ensure that a large current can pass without melting, the number of anode tabs is multiple and they are stacked together, and the number of cathode tabs is multiple and they are stacked together.

[0059] The material of the isolation film may be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly may be a wound structure or a laminated structure, but the embodiments of the present application are not limited thereto.

[0060] In recent years, battery devices have developed rapidly. Battery devices can be installed in vehicles, laptops, electric bicycles, electric toys, etc. This application uses the installation of battery devices in new energy vehicles as an example to illustrate. In recent years, new energy vehicles have made great strides in development. In the field of electric vehicles, battery devices play an irreplaceable and important role as the power source of electric vehicles. As a core component of new energy vehicles, battery devices have high reliability requirements.

[0061] In the related art, existing battery devices have the problem of slow charging, which causes users to wait for a long time when the battery device is charging, and the battery device also has the problem of poor battery life.

[0062] Based on the above considerations, in order to solve the problems of slow charging and poor battery life of the battery device, after in-depth research, a battery device was designed, including: a box body, a mounting cavity formed in the box body; a plurality of battery modules, the plurality of battery modules are arranged in the mounting cavity, each battery module includes at least one battery cell, the plurality of battery modules include a first battery module and a second battery module, the charging rate of the first battery module is different from the charging rate of the second battery module, the first battery module is a fast charging module, the charging rate of the first battery module is greater than or equal to 1C, and the energy density of the second battery module is greater than the energy density of the first battery module. By setting the first battery module, the first battery module is suitable for matching high-power fast charging piles, which can reduce the charging time of the battery device, which is beneficial to improving the charging efficiency of the battery device, and can reduce the long waiting time of the user when the battery device is charging, which is beneficial to improving the charging convenience of the battery device, effectively solving the problem of slow charging of the battery device. By setting the second battery module, the second battery module is used for long battery life requirements. The battery device can provide the power-consuming device with longer battery life during operation, effectively solving the problem of poor battery life of the battery device.

[0063] Please refer to Figure 1 , Figure 1 Schematic diagram of the structure of the vehicle 200 provided in some embodiments of the present application. The vehicle 200 can be a fuel vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery device 100 is installed on the chassis of the vehicle 200. The battery device 100 can be used to power the vehicle 200. For example, the battery device 100 can serve as an operating power source for the vehicle 200. The vehicle 200 may also include a controller 201 and a motor 202. The controller 201 is used to control the battery device 100 to power the motor 202, for example, for starting, navigating and driving the vehicle 200.

[0064] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 200 , but also as a driving power source for the vehicle 200 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 200 .

[0065] Reference below Figures 1-4 The battery device 100 according to the embodiment of the present application is described, taking the battery device 100 installed in a vehicle 200 as an example.

[0066] like Figure 2As shown, a battery device 100 according to an embodiment of the present application includes: a housing 10 having a mounting cavity 11 formed therein; a plurality of battery modules, each of which is disposed within the mounting cavity 11, each of which includes at least one battery cell 40; and a first battery module 20 and a second battery module 30. The first battery module 20 and the second battery module 30 have different charging rates. The first battery module 20 is a fast-charging module having a charging rate greater than or equal to 1C, and the energy density of the second battery module 30 is greater than the energy density of the first battery module 20. An energy management unit 60 is connected to both the first battery module 20 and the second battery module 30. The energy management unit 60 is configured to enable the first battery module 20 to charge the second battery module 30 when the battery device 100 is charging. When the first battery module 20 is charging the second battery module 30, the energy management unit 60 is further configured to enable the first battery module 20 to charge the second battery module 30 at the maximum charging rate of the second battery module 30.

[0067] When the battery device 100 is installed on the vehicle 200, the length direction of the battery device 100 is parallel to the driving direction of the vehicle 200, and the width direction of the battery device 100 is parallel to the width direction of the vehicle 200. Figure 2 As shown, the length direction of the battery device 100 is Figure 2 The X direction of the battery device 100 is Figure 2 In other words, the length direction of the battery device 100 is the front-rear direction of the vehicle 200 , and the width direction of the battery device 100 is the left-right direction of the vehicle 200 .

[0068] The battery device 100 includes a housing 10 and multiple battery modules. The battery modules can include multiple battery cells 40, which are arranged sequentially to form a battery module. Alternatively, the battery module can be constructed as a battery module, comprising battery side plates, battery end plates, and multiple battery cells 40. The battery side plates and battery end plates are connected to form an installation space, and the multiple battery cells 40 are installed within the installation space.

[0069] The multiple battery modules include a first battery module 20 and a second battery module 30. A portion of the multiple battery modules is configured as the first battery module 20, and another portion of the multiple battery modules is configured as the second battery module 30. There is at least one of each of the first battery module 20 and the second battery module 30. As an example, there are multiple first battery modules 20 and multiple second battery modules 30. As another example, there is a single first battery module 20 and multiple second battery modules 30. As another example, there is a single first battery module 20 and multiple second battery modules 30. This application uses the example of each of the first battery module 20 and the second battery module 30 being a single one.

[0070] An installation cavity 11 is formed within the housing 10. In other words, the installation cavity 11 is defined by the housing 10, and the housing 10 may include a first housing 12 and a second housing 13. The first housing 12 and the second housing 13 engage to form the installation cavity 11 within the housing 10. The installation cavity 11 can accommodate the first battery module 20 and the second battery module 30, that is, the first battery module 20 and the second battery module 30 are installed within the installation cavity 11. The first housing 12 can be one of the upper housing 10 and the lower housing 10, and the second housing 13 can be the other of the upper housing 10 and the lower housing 10. This application is described using the example of the first housing 12 being the upper housing 10 and the second housing 13 being the lower housing 10.

[0071] The first battery module 20 includes at least one battery cell 40. It can also be understood that the first battery module 20 includes one battery cell 40, or the first battery module 20 includes multiple battery cells 40. The second battery module 30 includes one battery cell 40, or the second battery module 30 includes multiple battery cells 40. This application uses the example of the first battery module 20 including multiple battery cells 40 and the second battery module 30 including multiple battery cells 40. The multiple battery cells 40 of the first battery module 20 are connected in series, parallel, or in a mixed series, and the multiple battery cells 40 of the second battery module 30 are connected in series, parallel, or in a mixed series.

[0072] The charge rate of the first battery module 20 is different from the charge rate of the second battery module 30. The first battery module 20 is a fast-charging module. The charge rate of the first battery module 20 is greater than or equal to 1C. The charge rate of the first battery module 20 can be 1C, 2C, 2.5C, 3C, and other values. The maximum upper limit of the charge rate of the first battery module 20 can be reasonably selected and set according to actual conditions. The charge rate of the first battery module 20 can be reasonably selected and set according to actual conditions. It should be noted that "C" is used to represent the battery charge and discharge rate. 1C represents the current intensity when the battery is fully charged and discharged in 1 hour. In other words, 1C represents the current value required for the battery to discharge or fully charge its rated capacity in 1 hour. 1C is a standardized expression in the battery field, and the ratio of current to capacity intuitively reflects the charge and discharge speed. By making the charge rate of the first battery module 20 greater than or equal to 1C, the first battery module 20 is constructed as a fast-charging module, which can be adapted to fast-charging piles.

[0073] As an example, the charge rate of the second battery module 30 can be less than 1C. When the charge rate of the second battery module 30 is less than 1C, the second battery module 30 is a slow-charging module. As another example, the charge rate of the second battery module 30 can be greater than or equal to 1C. When the charge rate of the second battery module 30 is greater than or equal to 1C, the second battery module 30 is a fast-charging module. This application uses the example of the second battery module 30 being a slow-charging module for explanation.

[0074] The energy density of the second battery module 30 is greater than that of the first battery module 20. Taking the second battery module 30 as an example, the energy density of the second battery module 30 is a core indicator for measuring battery performance. It is the ratio of the energy stored in the second battery module 30 to its mass or volume, and is expressed as gravimetric energy density (Wh / kg) or volumetric energy density (Wh / L), respectively. Similarly, the energy density of the first battery module 20 is a core indicator for measuring battery performance. It is the ratio of the energy stored in the first battery module 20 to its mass or volume, and is expressed as gravimetric energy density (Wh / kg) or volumetric energy density (Wh / L), respectively. If the volume of the second battery module 30 is the same as that of the first battery module 20 and both are fully charged, the second battery module 30 stores more energy than the first battery module 20. If the mass of the second battery module 30 is the same as that of the first battery module 20 and both are fully charged, the second battery module 30 stores more energy than the first battery module 20.

[0075] The battery device 100 may be provided with a fast-charging connector and a slow-charging connector. The fast-charging connector is electrically connected to the first battery module 20, and the slow-charging connector is electrically connected to the second battery module 30. The first battery module 20 can be charged by plugging the fast-charging connector into a fast-charging station, and the second battery module 30 can be charged by plugging the slow-charging connector into a slow-charging station. The charging rate of the first battery module 20 can be greater than the charging rate of the second battery module 30.

[0076] In the present application, the first battery module 20 and the second battery module 30 can manage their charge and discharge states separately. This can also be understood as the first battery module 20 can independently control charging or discharging, and the second battery module 30 can independently control charging or discharging. This independent control of charging and discharging can provide greater flexibility and adaptability for the vehicle 200. In some optional embodiments, when the electrical device is operating, the first battery module 20 or the second battery module 30 provides power to the electrical device. In other optional embodiments, when the electrical device is operating, the first battery module 20 and the second battery module 30 simultaneously provide power to the electrical device.

[0077] The design of the first battery module 20 supports high-power input charging. The first battery module 20 is suitable for matching high-power fast charging piles. The first battery module 20 can be used for fast charging functions. Compared with the existing technology, the battery device 100 can complete charging in a short time, which can reduce the charging time of the battery device 100, which is beneficial to improving the charging efficiency of the battery device 100, and can reduce the long waiting time of the user when the battery device 100 is charging. It is beneficial to improve the charging convenience of the battery device 100 and effectively solve the problem of slow charging of the battery device 100. The design of the second battery module 30 supports low-power input charging. The second battery module 30 is suitable for matching low-power slow charging piles. Since the energy density of the second battery module 30 is greater than that of the first battery module 20, the second battery module 30 can be used for long-range driving requirements. The second battery module 30 can provide a longer driving range during the driving process of the vehicle 200. The charging rate during high-power input charging is greater than the charging rate during low-power input charging. Furthermore, the battery device 100 of the present application is provided with both the first battery module 20 and the second battery module 30, which is beneficial for improving the charging speed of the battery device 100 and also for improving the battery life of the battery device 100, thereby facilitating the same battery device 100 to simultaneously meet the charging speed requirements and the battery life requirements.

[0078] The energy management unit 60 may be a battery management system, and is communicatively connected to both the first battery module 20 and the second battery module 30. The energy management unit 60 is configured to enable the first battery module 20 to charge the second battery module 30. Furthermore, when the first battery module 20 is charging the second battery module 30, the energy management unit 60 is further configured to enable the first battery module 20 to charge the second battery module 30 at the maximum charge rate of the second battery module 30.

[0079] In the above technical solution, by setting up a first battery module 20, the first battery module 20 is suitable for matching a high-power fast charging pile, which can reduce the charging time of the battery device 100, which is beneficial to improving the charging efficiency of the battery device 100, and can reduce the long waiting time of the user when the battery device 100 is charging, which is beneficial to improving the charging convenience of the battery device 100 and effectively solving the problem of slow charging of the battery device 100. By setting up a second battery module 30, the second battery module 30 is used for long-term battery life requirements. During the operation of the power device, the battery device 100 can provide the power device with a longer battery life, effectively solving the problem of poor battery life of the battery device 100. In addition, the battery device 100 of the present application is provided with both the first battery module 20 and the second battery module 30, which is beneficial to improving the charging speed of the battery device 100 and also to improving the battery life of the battery device 100, thereby helping the same battery device 100 to meet both the charging speed requirements and the battery life requirements. When the first battery module 20 charges the second battery module 30, the energy management unit 60 is configured to enable the first battery module 20 to charge the second battery module 30 at the maximum charging rate of the second battery module 30, so that part of the electricity in the first battery module 20 can be transferred to the second battery module 30 more quickly, which is conducive to completing the charging of the battery device 100 more quickly, and is conducive to improving the charging efficiency of the battery device 100, and can further reduce the user's waiting time in front of the fast charging pile.

[0080] According to some embodiments of the present application, the energy management unit 60 is further configured to enable the second battery module 30 to charge the first battery module 20 when the battery device 100 is charged.

[0081] The energy management unit 60 is also configured to enable the second battery module 30 to charge the first battery module 20. During the use of the battery device 100, the energy management unit 60 can control the first battery module 20 to charge the second battery module 30, or control the second battery module 30 to charge the first battery module 20 according to actual usage requirements.

[0082] As an example, a charging circuit is connected between the first battery module 20 and the second battery module 30. When the first battery module 20 needs to charge the second battery module 30, the energy management unit 60 sends a first charging signal to the first battery module 20 so that the first battery module 20 charges the second battery module 30 through the charging circuit. When the second battery module 30 needs to charge the first battery module 20, the energy management unit 60 sends a second charging signal to the second battery module 30 so that the second battery module 30 charges the first battery module 20 through the charging circuit, thereby achieving a mutual charging effect between the first battery module 20 and the second battery module 30.

[0083] As an optional embodiment, the first battery module 20 and the second battery module 30 are connected via a charging circuit, with the energy management unit 60 responsible for coordinating the power supply between them. The charging circuit includes a first charging branch 70 and a second charging branch 80. The first charging branch 70 is used for the first battery module 20 to charge the second battery module 30, and the second charging branch 80 is used for the second battery module 30 to charge the first battery module 20. The first battery module 20 may be provided with a first relay 71 connected to the first charging branch 70, and the second battery module 30 may be provided with a second relay 81 connected to the second charging branch 80. A first charging signal is used to close the first relay 71, and a second charging signal is used to close the second relay 81. Specifically, when the first battery module 20 needs to charge the second battery module 30, the energy management unit 60 sends a first charging signal to the first battery module 20, closing the first relay 71, thereby enabling the first battery module 20 to supply power to the second battery module 30. When the second battery module 30 is required to charge the first battery module 20 , the energy management unit 60 sends a second charging signal to the second battery module 30 to close the second relay 81 so that the second battery module 30 supplies power to the first battery module 20 .

[0084] During the charging process of the battery device 100, there are the following three situations:

[0085] During the charging process of the battery device 100, when the battery device 100 is connected to the fast charging pile, the fast charging pile gives priority to charging the first battery module 20. At the same time, the energy management unit 60 sends a first charging signal to the first battery module 20 so that the first battery module 20 charges the second battery module 30 through the charging circuit, and transfers part of the power in the first battery module 20 to the second battery module 30. In this way, the charging of the battery device 100 can be completed as soon as possible, which can reduce the user's waiting time in front of the fast charging pile.

[0086] During the charging process of the battery device 100, when the battery device 100 is connected to the slow charging pile, the slow charging pile gives priority to charging the second battery module 30. At the same time, the energy management unit 60 sends a second charging signal to the second battery module 30 so that the second battery module 30 charges the first battery module 20 through the charging circuit, and transfers part of the electricity in the second battery module 30 to the first battery module 20. On the basis of meeting the charging needs of the second battery module 30, the first battery module 20 can be charged, which is conducive to completing the charging of the battery device 100 and can also reduce the user's waiting time in front of the fast charging pile.

[0087] During the charging process of the battery device 100, when the battery device 100 is connected to both a fast-charging pile and a slow-charging pile, the first battery module 20 is charged separately via the fast-charging pile, while the second battery module 30 is charged separately via the slow-charging pile. This achieves the effect of charging the first battery module 20 and the second battery module 30 separately, which can complete the charging of the battery device 100 as quickly as possible and reduce the user's waiting time at the fast-charging pile. In this embodiment, the energy management unit 60 does not control the first battery module 20 to charge the second battery module 30, nor does the energy management unit 60 control the second battery module 30 to charge the first battery module 20.

[0088] During the charging process of the battery device 100, when the first battery module 20 charges the second battery module 30, the energy management unit 60 sends a first charging signal to the first battery module 20 to close the first relay 71. At the same time, the energy management unit 60 sends a charging rate signal to the first battery module 20, so that the first battery module 20 charges the second battery module 30 at the maximum charging rate of the second battery module 30. This can enable part of the electricity in the first battery module 20 to be transferred to the second battery module 30 more quickly, which is conducive to completing the charging of the battery device 100 more quickly and can further reduce the user's waiting time in front of the fast charging pile.

[0089] In the above technical solution, the energy management unit 60 is configured to enable the first battery module 20 to charge the second battery module 30 when the battery device 100 is charging, and also enable the second battery module 30 to charge the first battery module 20. The energy management unit 60 can charge the first battery module 20 and the second battery module 30 with each other according to the actual charging status of the battery device 100, and can complete the charging of the battery device 100 as soon as possible, which can further reduce the user's waiting time in front of the fast charging pile, and is more conducive to improving the charging convenience of the battery device 100 and better solving the problem of slow charging of the battery device 100.

[0090] According to some embodiments of the present application, when the battery device 100 is discharged, the energy management unit 60 is further configured to enable the first battery module 20 to charge the second battery module 30 .

[0091] When the battery device 100 is discharged, the following two situations may occur:

[0092] During the driving of the vehicle 200, when the battery device 100 supplies power to the vehicle 200, the electric energy of the second battery module 30 can be used in priority to the first battery module 20. It can also be understood that the second battery module 30 supplies power to the vehicle 200 in priority to the first battery module 20, and the electric energy of the second battery module 30 is reduced in priority to the electric energy of the first battery module 20. At the same time, the energy management unit 60 sends a first charging signal to the first battery module 20 so that the first battery module 20 charges the second battery module 30 through the charging circuit, and transfers part of the electricity in the first battery module 20 to the second battery module 30. Part of the electricity in the first battery module 20 is used for power replenishment or power management of the second battery module 30.

[0093] When the vehicle 200 is parked, the electric energy in the second battery module 30 decreases. At this time, the energy management unit 60 sends a first charging signal to the first battery module 20 so that the first battery module 20 charges the second battery module 30 through the charging circuit, and transfers part of the electric energy in the first battery module 20 to the second battery module 30. Part of the electric energy in the first battery module 20 is used for electric energy replenishment or electric energy management of the second battery module 30.

[0094] In the above technical solution, when the battery device 100 is discharging, the energy management unit 60 is also configured to enable the first battery module 20 to charge the second battery module 30, which can reduce the amount of electricity stored in the first battery module 20, which is beneficial to extending the service life of the first battery module 20, thereby benefiting to extending the service life of the battery device 100. In addition, the power distribution between the second battery module 30 and the first battery module 20 can be dynamically optimized to reduce the difference between the amount of electricity in the second battery module 30 and the amount of electricity in the first battery module 20, which is beneficial to keeping the second battery module 30 and the first battery module 20 in the best working state.

[0095] According to some embodiments of the present application, the energy management unit 60 is disposed in the installation cavity 11 .

[0096] The energy management unit 60 is disposed within the mounting cavity 11. The energy management unit 60 can be fixed to the housing 10. The energy management unit 60 can be fixed to the housing 10 by adhesive bonding, bolts, or snap-fitting. The specific method of fixing the energy management unit 60 to the housing 10 is not specifically limited, as long as the energy management unit 60 can be fixed to the housing 10. The housing 10 can cover and protect the energy management unit 60, reducing the risk of damage to the energy management unit 60 and further extending the service life of the battery device 100.

[0097] In the above technical solution, by setting the energy management unit 60 in the installation cavity 11, the box body 10 can cover the energy management unit 60. The box body 10 can protect the energy management unit 60, reduce the risk of the energy management unit 60 being damaged, and is more conducive to extending the service life of the battery device 100.

[0098] According to some embodiments of the present application, the charging rate of the second battery module 30 is less than 1C.

[0099] The charging rate of the second battery module 30 can be 0.99C, 0.8C, 0.7C, 0.5C, 0.11C, 0.09C, 0.01C and other values. The charging rate of the second battery module 30 can be reasonably selected and set according to actual conditions.

[0100] In the above technical solution, by making the charging rate of the second battery module 30 less than 1C, the second battery module 30 can be constructed as a slow charging module, which is beneficial to increase the energy density of the second battery module 30, thereby helping the second battery module 30 to meet the endurance requirements.

[0101] According to some embodiments of the present application, the battery device 100 is configured such that when connected to a fast charging pile, the first battery module 20 is charged by the fast charging pile.

[0102] Among them, the charging rate of the first battery module 20 is greater than the charging rate of the second battery module 30, and the charging rate of the fast charging pile is greater than the maximum charging rate of the second battery module 30. Therefore, when the battery device 100 is connected to the fast charging pile, if the second battery module 30 is charged by the fast charging pile, the charging rate of the fast charging pile is greater than the maximum charging rate of the second battery module 30, which may easily cause damage to the second battery module 30, affecting the service life of the second battery module 30, and thus affecting the service life of the battery device 100.

[0103] As an optional embodiment, the battery device 100 may be provided with a fast-charging connector and a slow-charging connector. The fast-charging connector is used to electrically connect to the first battery module 20, and the slow-charging connector is used to electrically connect to the second battery module 30. The first battery module 20 can be charged by plugging the fast-charging connector into a fast-charging pile, and the second battery module 30 can be charged by plugging the slow-charging connector into a slow-charging pile. When the battery device 100 is connected to a fast-charging pile, the fast-charging pile is connected to the fast-charging connector, so that the fast-charging pile charges the first battery module 20. At the same time, the energy management unit 60 sends a first charging signal to the first battery module 20, so that the first battery module 20 charges the second battery module 30 through the charging circuit, transferring part of the power in the first battery module 20 to the second battery module 30, thereby charging the second battery module 30.

[0104] In the above technical solution, the battery device 100 is configured so that the first battery module 20 is charged by the fast charging pile when connected to the fast charging pile, which is beneficial to protecting the second battery module 30, reducing the risk of damage to the second battery module 30, and improving the service life of the second battery module 30, thereby improving the service life of the battery device 100.

[0105] According to some embodiments of the present application, the first battery module 20 is configured to recover kinetic energy of the electrical device during operation, so that the first battery module 20 is charged.

[0106] Among them, the battery device 100 can be connected to the generator, and further, the first battery module 20 can be connected to the generator. During the driving of the vehicle 200, the kinetic energy of the vehicle 200 can drive the generator to generate electricity. Since the first battery module 20 is connected to the generator, the generator can store the electrical energy generated by the generator in the first battery module 20, so that the first battery module 20 is charged. The first battery module 20 can fully recover the recharged amount during the driving of the vehicle 200, which is beneficial to reducing energy consumption loss. Moreover, during the driving of the vehicle 200, the battery device 100 supplies power to the vehicle 200, and at the same time, the first battery module 20 is charged, which is beneficial to further improve the endurance of the battery device 100.

[0107] In the above technical solution, the first battery module 20 is configured to recover the kinetic energy of the electrical device during operation. During the driving of the vehicle 200, the first battery module 20 can fully recover the recharged amount during the driving of the vehicle 200, so that the first battery module 20 is charged, which is beneficial to reducing energy consumption losses. Moreover, during the driving of the vehicle 200, the battery device 100 supplies power to the vehicle 200, and at the same time, the first battery module 20 is charged, which is beneficial to further improve the endurance of the battery device 100.

[0108] According to some embodiments of the present application, the power usage range of the first battery module 20 is greater than or equal to 0% SOC and less than or equal to 80% SOC.

[0109] The power usage range of the first battery module 20 is greater than or equal to 0% SOC and less than or equal to 80% SOC. It should be noted that the first battery module 20 is used between 0% SOC and 80% SOC, and 0% SOC and 80% SOC also fall within the power usage range of the first battery module 20. The first battery module 20 can be charged to 1% SOC, 20% SOC, 30% SOC, 40% SOC, 45% SOC, 47% SOC, 60% SOC, 70% SOC, 80% SOC, etc. of a full charge, and the first battery module 20 can also be discharged to 0% SOC, 1% SOC, 20% SOC, 30% SOC, 40% SOC, 45% SOC, 47% SOC, 60% SOC, 70% SOC, 80% SOC, etc. of a full charge.

[0110] It should be noted that the battery's SOC (State of Charge) is a key parameter for measuring the remaining battery power, indicating the percentage of the current power to the rated capacity (0%-100%).

[0111] In the above technical solution, by setting the power usage interval of the first battery module 20 to be greater than or equal to 0% SOC and less than or equal to 80% SOC, the first battery module 20 is charged and discharged within the power usage interval of the first battery module 20, which is beneficial to maintaining the charging speed of the first battery module 20, thereby helping to maintain the charging speed of the battery device 100, and also helping to improve the cycle life of the first battery module 20, thereby helping to further improve the service life of the battery device 100.

[0112] According to some embodiments of the present application, the power usage range of the second battery module 30 is greater than or equal to 20% SOC and less than or equal to 100% SOC.

[0113] Among them, the power usage range of the second battery module 30 is greater than or equal to 20% SOC and less than or equal to 100% SOC. It should be noted that the second battery module 30 is used between 20% SOC and 100% SOC, and 20% SOC and 100% SOC are also values ​​within the power usage range of the second battery module 30. The second battery module 30 can be charged to 20% SOC, 21% SOC, 30% SOC, 40% SOC, 45% SOC, 47% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, 98% SOC, 100% SOC, etc. when fully charged, and the second battery module 30 can also be discharged to 20% SOC, 21% SOC, 30% SOC, 40% SOC, 45% SOC, 47% SOC, 60% SOC, 70% SOC, 80% SOC, 90% SOC, 98% SOC, 100% SOC, etc. when fully charged.

[0114] In the above technical solution, the power usage interval of the second battery module 30 is greater than or equal to 20% SOC and less than or equal to 100% SOC, and the second battery module 30 is charged and discharged within the power usage interval of the second battery module 30, which is beneficial to improving the lower discharge limit SOC of the second battery module 30, and is beneficial to slowing down the decomposition of the anode SEI film of the battery cell 40 in the second battery module 30, which is beneficial to slowing down the attenuation of the long-term endurance of the second battery module 30 during its life cycle, and is beneficial to improving the endurance of the battery device 100.

[0115] like Figure 1 As shown, an electric device according to an embodiment of the present application includes the battery device 100 of the above-described embodiment. The battery device 100 is installed in the electric device, which can reduce the charging time of the electric device, thereby improving the charging efficiency of the electric device. It can also reduce the long waiting time for users when charging the electric device, thereby improving the charging convenience of the electric device and effectively solving the problem of slow charging of the electric device. During operation, the battery device 100 can provide the electric device with a longer battery life, effectively solving the problem of poor battery life of the electric device.

[0116] According to some embodiments of the present application, see Figure 2As shown, the present application provides a battery device 100, comprising: a housing 10, a first battery module 20, an energy management unit 60, and a second battery module 30. An installation cavity 11 is formed in the housing 10, and the first battery module 20 and the second battery module 30 are both arranged in the installation cavity 11. The first battery module 20 includes at least one battery cell 40, and the second battery module 30 includes at least one battery cell 40. The energy density of the second battery module 30 is greater than the energy density of the first battery module 20. The charging rate of the first battery module 20 and the charging rate of the second battery module 30 are different. The first battery module 20 is a fast charging module, and the charging rate of the first battery module 20 is greater than or equal to 1C, and the charging rate of the second battery module 30 is less than 1C. The energy management unit 60 is connected to both the first battery module 20 and the second battery module 30. When the battery device 100 is connected to a fast-charging station, the energy management unit 60 enables the first battery module 20 to charge the second battery module 30. When the battery device 100 is connected to a slow-charging station, the energy management unit 60 enables the second battery module 30 to charge the first battery module 20. When the first battery module 20 is charging the second battery module 30, the energy management unit 60 enables the first battery module 20 to charge the second battery module 30 at the maximum charge rate of the second battery module 30. When the battery device 100 is discharging, the energy management unit 60 enables the first battery module 20 to charge the second battery module 30. The battery device 100 is configured so that the first battery module 20 is charged by the fast-charging station when connected. The first battery module 20 is configured to recover kinetic energy from the operating device to charge the first battery module 20. The power usage range of the first battery module 20 is greater than or equal to 0% SOC and less than or equal to 80% SOC. The power usage range of the second battery module 30 is greater than or equal to 20% SOC and less than or equal to 100% SOC.

[0117] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0118] Other components of the battery device 100 according to the embodiment of the present application, such as the explosion-proof valve and the heat exchange structure, as well as operations are known to those skilled in the art and will not be described in detail here.

[0119] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0120] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A battery device, characterized in that: include: A box body, wherein a mounting cavity is formed in the box body; a plurality of battery modules, each of the battery modules being disposed in the mounting cavity, each of the battery modules comprising at least one battery cell, the plurality of battery modules comprising a first battery module and a second battery module, the first battery module having a different charging rate than the second battery module, the first battery module being a fast-charging module, the charging rate of the first battery module being greater than or equal to 1C, and the energy density of the second battery module being greater than the energy density of the first battery module; An energy management unit, wherein the energy management unit is connected to both the first battery module and the second battery module, and the energy management unit is configured to enable the first battery module to charge the second battery module when the battery device is charging, and when the first battery module is charging the second battery module, the energy management unit is further configured to enable the first battery module to charge the second battery module at the maximum charging rate of the second battery module.

2. The battery device according to claim 1, wherein: The energy management unit is further configured to enable the second battery module to charge the first battery module when the battery device is charged.

3. The battery device according to claim 2, characterized in that When the battery device is discharged, the energy management unit is further configured to enable the first battery module to charge the second battery module.

4. The battery device according to claim 2, wherein: The energy management unit is arranged in the installation cavity.

5. The battery device according to any one of claims 1 to 4, characterized in that: The charging rate of the second battery module is less than 1C.

6. The battery device according to any one of claims 1 to 4, characterized in that: The battery device is configured such that when connected to a fast charging pile, the first battery module is charged by the fast charging pile.

7. The battery device according to any one of claims 1 to 4, characterized in that: The first battery module is configured to recover kinetic energy of the electric device during operation, so that the first battery module is charged.

8. The battery device according to any one of claims 1 to 4, characterized in that: The power usage range of the first battery module is greater than or equal to 0% SOC and less than or equal to 80% SOC.

9. The battery device according to any one of claims 1 to 4, characterized in that: The power usage range of the second battery module is greater than or equal to 20% SOC and less than or equal to 100% SOC.

10. An electrical device, characterized in that: Comprising the battery device according to any one of claims 1-9.

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