Battery charging method, battery pack, charging management device and system, vehicle

Abstract

The application relates to a battery charging method, a battery pack, a charging management device and system, and a vehicle. The method comprises the following steps: when a charging instruction is detected, charging a first type of battery cell; when the temperature of a second type of battery cell reaches a preset temperature, starting to charge the second type of battery cell; wherein the maximum charge-discharge rate of the first type of battery cell is greater than that of the second type of battery cell, the energy density of the first type of battery cell is less than that of the second type of battery cell, and at least part of the second type of battery cell is arranged adjacent to the first type of battery cell. According to the scheme provided by the application, the charging sequence of different types of battery cells is controlled by the charging management device, so that the heat of the fast-charging first type of battery cell is absorbed by the high-capacity second type of battery cell, thereby avoiding a thermal runaway accident caused by excessively high temperature rise of the battery cell, and meanwhile, the battery pack can have both high capacity and fast-charging performance by using different types of battery cells.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of charging, in particular to a battery charging method, a battery pack, a charging management device and system, and a vehicle. BACKGROUND

[0002] In a new energy vehicle, as the only power source of the vehicle driving system, the parameter design of the power battery cell restricts the endurance performance of the vehicle. Among them, the capacity and the charge-discharge rate of the cell are two very important parameters.

[0003] In the related art, a plurality of cells with uniform parameter specifications are generally used to form a battery module, and a plurality of battery modules form a battery pack to serve as the power battery of the vehicle. However, the current power battery is difficult to simultaneously have high capacity and high charge-discharge rate fast charging capability. In addition, during the fast charging of the power battery, if the battery temperature rises too high, accidents such as thermal runaway may occur. SUMMARY

[0004] To solve or partially solve the problems in the related art, the present application provides a battery charging method, a battery pack, a charging management device and system, and a vehicle, which can have high capacity and high charge-discharge rate fast charging capability, and can absorb heat during charging through different types of cells to cool down.

[0005] The first aspect of the present application provides a battery charging method, comprising:

[0006] charging the first type of cell when a charging instruction is detected;

[0007] starting to charge the second type of cell when the temperature of the second type of cell reaches a preset temperature;

[0008] wherein the maximum charge-discharge rate of the first type of cell is greater than the maximum charge-discharge rate of the second type of cell, the energy density of the first type of cell is less than the energy density of the second type of cell, and at least part of the second type of cell is arranged adjacent to the first type of cell.

[0009] In some embodiments, when the charging instruction is detected, the first type of cell is charged, comprising: when a normal charging mode is triggered, the first type of cell is charged according to a first normal charging rule;

[0010] When the temperature of the second type of cell reaches the preset temperature, the second type of cell is charged, comprising: when the temperature of the second type of cell reaches the preset temperature, the second type of cell is charged according to a second normal charging rule.

[0011] In some embodiments, the charging the first type of battery cells when the charging instruction is detected comprises: charging the first type of battery cells according to a first fast charging rule when a fast charging mode is triggered.

[0012] The charging the second type of battery cells when the temperature of the second type of battery cells reaches the preset temperature comprises: charging the second type of battery cells according to a second fast charging rule when the temperature of the second type of battery cells reaches the preset temperature.

[0013] In some embodiments, after the charging the second type of battery cells according to the second fast charging rule, the method further comprises:

[0014] When the state of charge of the first type of battery cells or the second type of battery cells reaches a preset threshold, switching to a normal charging mode to charge the first type of battery cells according to a first normal charging rule and charge the second type of battery cells according to a second normal charging rule.

[0015] In some embodiments, the method further comprises: stopping charging the first type of battery cells and the second type of battery cells respectively when a preset power-off condition is reached.

[0016] The first normal charging rule comprises that, in the normal charging mode, different states of charge of the first type of battery cells correspond to preset charging rates and charging durations;

[0017] The second normal charging rule comprises that, in the normal charging mode, different states of charge of the second type of battery cells correspond to preset charging rates and charging durations;

[0018] The first fast charging rule comprises that, in the fast charging mode, different states of charge of the first type of battery cells correspond to preset charging rates and charging durations;

[0019] The second fast charging rule comprises that, in the fast charging mode, different states of charge of the second type of battery cells correspond to preset charging rates and charging durations.

[0020] The second aspect of the application provides a battery pack comprising a plurality of first type of battery cells and a plurality of second type of battery cells, the plurality of first type of battery cells being connected in parallel and / or in series with each other, the plurality of second type of battery cells being connected in parallel and / or in series with each other, and the plurality of first type of battery cells and the plurality of second type of battery cells forming a cycle unit; wherein:

[0021] The maximum charge-discharge rate of the first type of battery cells is greater than the maximum charge-discharge rate of the second type of battery cells, the energy density of the first type of battery cells is less than the energy density of the second type of battery cells, and at least part of the second type of battery cells is arranged adjacent to the first type of battery cells.

[0022] In some embodiments, the first type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a lithium iron manganese phosphate / graphite system; the second type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a lithium iron manganese phosphate / graphite system; the system of the first type of battery cell is the same as or different from the system of the second type of battery cell. The first type of battery cell is a square battery cell, a cylindrical battery cell, or a blade battery cell; the second type of battery cell is a square battery cell, a cylindrical battery cell, or a blade battery cell; the shape and size of the first type of battery cell are the same as or different from the shape and size of the second type of battery cell.

[0023] The third aspect of the present application provides a charging management device, comprising:

[0024] a processor; and

[0025] a memory having executable code stored thereon, which, when executed by the processor, causes the processor to perform the battery charging method as described above.

[0026] The fourth aspect of the present application provides a power battery system, comprising the battery pack and the charging management device as described above, wherein the charging management device is configured to perform charging management on the battery pack.

[0027] The fifth aspect of the present application provides a vehicle comprising the battery pack or the power battery system as described above.

[0028] The technical solution provided by the present application can include the following beneficial effects: by adopting the first type of battery cell and the second type of battery cell with different performance parameters, the demand for high capacity and fast charging performance can be met at the same time, and by designing the different types of battery cells adjacently, the heat of the battery cell with higher temperature rise can be effectively transferred, thereby reducing the temperature of the fast-charging battery cell and avoiding the occurrence of thermal runaway accidents. In addition, the system and structure design of the first type of battery cell and the second type of battery cell can be matched according to specific needs, and the user's needs can be met by flexible matching.

[0029] The technical solution of the present application can also control the charging sequence of different types of battery cells through the charging management device, so that the heat of the first type of fast-charging battery cell is absorbed by the second type of high-capacity battery cell, thereby avoiding the occurrence of thermal runaway accidents caused by excessive temperature rise of the battery cell. At the same time, by using different types of battery cells, the battery pack can have both high capacity and fast charging performance. In addition, by flexibly setting the power-off condition, battery overcharging can be effectively prevented, and the service life of the battery can be improved.

[0030] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings in which like reference characters refer to like parts throughout the figures, and in which:

[0032] Figure 1 is a structural schematic diagram of a power battery system according to an embodiment of the present application;

[0033] Figure 2 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0034] Figure 3 is a structural schematic diagram of a battery pack according to an embodiment of the present application;

[0035] Figure 4 is a flowchart of a battery charging method according to an embodiment of the present application;

[0036] Figure 5 is another flowchart of a battery charging method according to an embodiment of the present application;

[0037] Figure 6 is a flowchart of two charging modes according to an embodiment of the present application;

[0038] Figure 7 is another flowchart of a battery charging method according to an embodiment of the present application;

[0039] Figure 8 is a structural schematic diagram of a charging management device according to an embodiment of the present application;

[0040] Figure 9 is another structural schematic diagram of a charging management device according to an embodiment of the present application;

[0041] Figure 10 is a structural schematic diagram of a charging management device according to an embodiment of the present application. DETAILED DESCRIPTION

[0042] Embodiments of the present application will be described in more detail by way of example with reference to the accompanying drawings. Although the embodiments of the present application are shown in the drawings, it is to be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present application will be thorough and complete, and will fully convey the scope of the present application to those skilled in the art.

[0043] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in this application and the appended claims, the singular forms "a," "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0044] It should be understood that although the terms "first," "second," "third," etc. can be used in this application to describe various information, the information should not be limited to these terms. These terms are only used to distinguish one type of information from another type of information. For example, without departing from the scope of the application, first information can also be referred to as second information, and similarly, second information can also be referred to as first information. Therefore, the features defined with "first," "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] In the related art, a battery pack is generally composed of the same type of battery cell, and it is difficult to simultaneously have high capacity and high charge / discharge rate fast charging capability. In addition, during fast charging of a power battery, if the battery temperature rises too high, accidents such as thermal runaway may occur.

[0046] To solve the above problems, the present application Figure 1 The power battery system provided by the embodiments of the present application includes a battery pack 100 and a charging management device 200, and the charging management device 200 is configured to perform charging management on the battery pack 100. The power battery system can be applied to various energy storage devices such as vehicles, aircraft or robots, without specific limitation. Of course, the battery pack 100 can also be applied to various energy storage devices such as vehicles, aircraft or robots, without specific limitation. Taking a vehicle as an example, the vehicle of an embodiment of the present application includes a battery pack or a power battery system.

[0047] Referring to Figure 2 The battery pack 100 provided by an embodiment of the present application includes a plurality of first type battery cells 110 and a plurality of second type battery cells 120, the plurality of first type battery cells 110 are connected in parallel and / or in series with each other, the plurality of second type battery cells 120 are connected in parallel and / or in series with each other, and the plurality of first type battery cells 110 and the plurality of second type battery cells 120 form a cycle unit; wherein: the maximum charge / discharge rate of the first type battery cell 110 is greater than the maximum charge / discharge rate of the second type battery cell 120, the energy density of the first type battery cell 110 is less than the energy density of the second type battery cell 120, and at least part of the second type battery cells 120 are arranged adjacent to the first type battery cells 110.

[0048] It can be understood that, compared with the second type of battery cell, the first type of battery cell focuses more on fast charging capability and fast charging safety design, and the first type of battery cell can be regarded as a fast charging battery cell. Compared with the first type of battery cell, the second type of battery cell focuses more on high capacity, and the second type of battery cell can be regarded as a high-capacity battery cell. Based on this, the maximum charge-discharge rate of the first type of battery cell is greater than that of the second type of battery cell, so that the first type of battery cell has better fast charging performance than the second type of battery cell; and the energy density of the first type of battery cell is less than that of the second type of battery cell, so that the second type of battery cell has higher capacity than the first type of battery cell under the same volume. By grouping the above different types of first type of battery cell and second type of battery cell into a battery pack, the battery pack can have both fast charging performance and high capacity. Of course, the volumes of the first type of battery cell and the second type of battery cell can be different. Under different volumes, for example, when the volume of the first type of battery cell is greater than that of the second type of battery cell, the capacity of the first type of battery cell can also be greater than that of the second type of battery cell. For example, the capacity ratio of the first type of battery cell to the second type of battery cell can be (1:4)~(4:1), and of course, the specific capacity can be set according to actual needs, which is not limited herein.

[0049] In an embodiment, the battery pack can include a plurality of cycle units, and a single cycle unit is composed of at least one first type of battery cell and at least one second type of battery cell, and a single cycle unit is regarded as a battery module, that is, the battery pack can be composed of a plurality of battery modules. Of course, the battery pack can also be composed of a plurality of first type of battery cells and a plurality of second type of battery cells, that is, the battery pack is composed of battery cells without modules, and the battery pack without modules can also be regarded as a cycle unit. In a specific embodiment, in the battery pack without modules or in a single cycle unit, a plurality of first type of battery cells are connected in series to form a first type of battery cell group, and a plurality of first type of battery cell groups are connected in parallel with each other; the number of first type of battery cells in each first type of battery cell group can be the same or different. A plurality of second type of battery cells are connected in series to form a second type of battery cell group, and a plurality of second type of battery cell groups are connected in parallel with each other; the number of second type of battery cells in each second type of battery cell group can be the same or different, and the specific number of battery cells is adjusted according to actual needs, which is not limited herein. Further, the plurality of first type of battery cell groups connected in parallel and the plurality of second type of battery cell groups connected in parallel form a cycle unit or a battery pack without modules.

[0050] In an embodiment, the first type of battery cell and the second type of battery cell are connected to different charge control modules of the charge management system, so as to be charged according to corresponding charge rules. In an embodiment, when the number of the first type of battery cell and the second type of battery cell is multiple, the multiple first type of battery cells are connected to the first charge control module, and the multiple second type of battery cells are connected to the second charge control module. In an embodiment, when the battery pack has multiple cycle units, the first charge control module and the second charge control module are connected to the same cycle unit respectively, so as to control the charging of the first type of battery cell and the second type of battery cell in the single cycle unit respectively. That is, although the single cycle unit includes the first type of battery cell and the second type of battery cell, the first type of battery cell and the second type of battery cell are controlled by different charge control modules to control the charging current, and there is no direct connection relationship in the circuit, but they are arranged adjacent to each other in the arrangement position, so as to control the excessive temperature rise of the first type of battery cell during charging by absorbing the heat generated by the first type of battery cell by the second type of battery cell.

[0051] In an embodiment, at least one second type of battery cell is arranged between two first type of battery cells; and / or at least one side of a single first type of battery cell is arranged adjacent to a second type of battery cell. That is, whether it is a modular battery pack or a non-modular battery pack, the first type of battery cell and the second type of battery cell can be arranged in the above-mentioned manner. For example, in a cycle unit, the array can be arranged in the order of first type of battery cell / second type of battery cell / first type of battery cell / multiple second type of battery cells / first type of battery cell. As shown in FIG. 1, wherein several arrangement structures of the first type of battery cell and the second type of battery cell in a single cycle unit are shown, the number of the first type of battery cell and the second type of battery cell is not limited, and the volume of the first type of battery cell and the second type of battery cell can be different. Of course, the drawings are only illustrative and are not limited. Figure 3

[0052] It can be understood that the first type of battery cell is a fast-charging battery cell, which is easy to generate a large temperature rise during charging. By arranging the second type of battery cell adjacent to the first type of battery cell, the second type of battery cell can absorb the heat of the first type of battery cell, so as to help reduce the temperature of the first type of battery cell and effectively reduce the risk of thermal runaway. Alternatively, the first type of battery cell and the second type of battery cell can be arranged alternately one by one, or multiple second type of battery cells are arranged between two first type of battery cells, or the first type of battery cell is arranged between multiple second type of battery cells, which are only illustrative and are not limited in the specific arrangement manner. Such design makes at least one side of the first type of battery cell contact one or more second type of battery cells, so as to transfer the heat of the first type of battery cell to the second type of battery cell for effective temperature control.

[0053] ​To meet different needs of users, the system of the first type of battery cell and the second type of battery cell can be customized. In an embodiment, the first type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a manganese iron lithium phosphate / graphite system; the second type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a manganese iron lithium phosphate / graphite system; and the system of the first type of battery cell and the system of the second type of battery cell can be the same or different. For different cycle units, the system of the first type of battery cell and the second type of battery cell can also be customized, that is, each cycle unit can independently select a corresponding system, and can be matched according to specific needs.

[0054] Further, the first type of battery cell and the second type of battery cell can be customized to select a corresponding structural design. In an embodiment, the first type of battery cell is a square battery cell, a cylindrical battery cell, or a blade battery cell; the second type of battery cell is a square battery cell, a cylindrical battery cell, or a blade battery cell; and the shape and size of the first type of battery cell and the second type of battery cell can be the same or different. That is, the first type of battery cell can adopt the same shape as the second type of battery cell, or can adopt a different shape. When the same shape is adopted, the first type of battery cell and the second type of battery cell can adopt different sizes, which is not limited herein. When the battery pack has multiple cycle units, the shape and size of the first type of battery cell and the second type of battery cell of each cycle unit can also be independently designed.

[0055] As can be seen from the example, the battery pack of the present application is composed of the first type of battery cell and the second type of battery cell with different performance parameters to simultaneously meet the needs of high capacity and fast charging performance, and the different types of battery cells are designed adjacent to each other, so that the heat of the battery cell with higher temperature rise can be effectively transferred, thereby reducing the temperature of the fast-charging battery cell and avoiding thermal runaway accidents. In addition, the system and structural design of the first type of battery cell and the second type of battery cell can be matched according to specific needs, and the user needs can be met through flexible matching.

[0056] Referring to Figure 4 An embodiment of the present application provides a power battery system, which includes a battery pack and a charging management device configured to perform charging management on the battery pack. Specifically, the charging management device is configured to perform the battery charging method of the present application. The battery charging method of an embodiment of the present application includes:

[0057] S110, when a charging instruction is detected, charging the first type of battery cell.

[0058] S120, when it is detected that the temperature of the second type of battery cell reaches a preset temperature, starting to charge the second type of battery cell.

[0059] The battery pack to be charged includes first type battery cells and second type battery cells, wherein the maximum charge-discharge rate of the first type battery cells is greater than that of the second type battery cells, the energy density of the first type battery cells is less than that of the second type battery cells, and at least part of the second type battery cells are arranged adjacent to the first type battery cells. That is, the first type battery cells belong to the fast charging battery cell type, and the second type battery cells belong to the high capacity battery cell type. For example, the maximum charge-discharge rate of the first type battery cells can be 2C-5C, and the maximum charge-discharge rate of the second type battery cells can be 0.33C-2C.

[0060] The charging management device charges the first type battery cells first according to the received charging instruction through step S110, the temperature of the first type battery cells rises, and at least part of the second type battery cells are arranged adjacent to the first type battery cells, so that the second type battery cells absorb the heat of the first type battery cells, thereby slowing down the spread of heat and maintaining the overall temperature in the battery pack within the ideal range, avoiding the occurrence of thermal runaway of the first type battery cells due to excessive temperature rise caused by fast charging.

[0061] When the second type battery cells are preheated to a preset temperature by the first type battery cells, the charging management device can execute step S120 to start charging the second type battery cells. At the same time, the first type battery cells continue to charge. Optionally, the preset temperature reached by the second type battery cells can be 35℃-50℃, such as 35℃, 40℃, 45℃, 50℃, etc., and the specific temperature is not limited herein. The heat generated by the first type battery cells can effectively improve the charging efficiency of the second type battery cells, while slowing down the spread of heat of the first type battery cells and preventing thermal runaway of the first type battery cells.

[0062] Optionally, the charging management device can also be configured to execute the following steps:

[0063] S130, when the preset power-off condition is reached, stop charging the first type battery cells and the second type battery cells respectively.

[0064] The power-off condition can be set in advance to enable the charging management device to stop charging the first type battery cells and the second type battery cells in time. For example, the preset power-off condition can be to stop charging when fully charged, or to stop charging when the user-defined SOC (State Of Charge) or the system default SOC is reached. It can be understood that for the first type battery cells and the second type battery cells, corresponding power-off conditions can be set respectively or a unified power-off condition can be set. It can be understood that due to the different start times of charging of the first type battery cells and the second type battery cells, the respective charging stop times can be different. In an embodiment, the full charging time of the second type battery cells and the first type battery cells can be (1.2:1)-(4:1), wherein the charging time corresponding to different states of charge can be adjusted according to different battery capacities.

[0065] From the example, the battery charging method of the application controls the charging sequence of different types of battery cells through the charging management device, so that the heat of the first type of fast charging battery cell is absorbed by the second type of high capacity battery cell, thereby avoiding the thermal runaway accident caused by the excessive temperature rise of the battery cell. At the same time, by using different types of battery cells, the battery pack can have high capacity and fast charging performance. In addition, by flexibly setting the power-off condition, the overcharging of the battery can be effectively prevented, and the service life of the battery can be improved.

[0066] Referring to Figure 5 and Figure 6 , the charging management device of the application is configured to execute the following battery charging method. The battery charging method of an embodiment of the application comprises:

[0067] S210, when detecting triggering a normal charging mode, charging the first type of battery cell according to a first normal charging rule.

[0068] S220, when detecting that the temperature of the second type of battery cell reaches a preset temperature, starting to charge the second type of battery cell according to a second normal charging rule.

[0069] S230, when a preset power-off condition is reached, stopping charging the first type of battery cell and the second type of battery cell respectively.

[0070] Among them, different charging modes can be designed in advance for users to choose, such as normal charging mode, fast charging mode, etc., and different charging modes have corresponding charging rules. When the charging management device receives the charging instruction of the corresponding charging mode, it can charge according to the corresponding charging rule. For example, for the same state of charge, the charging time required by the normal charging mode is longer than that of the fast charging mode, but the normal charging mode is relatively beneficial to the service life of the battery. Therefore, by the actual demand of the user, different charging modes can be selected. For example, when the user needs a car urgently, the fast charging mode can be selected to shorten the waiting time; when the user does not need a car urgently, the normal charging mode can be selected to reduce the damage to the battery.

[0071] When in the normal charging mode, in an embodiment, the first normal charging rule includes that the first type of battery cell in the normal charging mode has a preset corresponding charging rate and charging time for different states of charge; the second normal charging rule includes that the second type of battery cell in the normal charging mode has a preset corresponding charging rate and charging time for different states of charge.

[0072] It can be understood that, based on the different performance parameters of the first type of battery cell and the second type of battery cell, the charging rules adopted are correspondingly designed. Alternatively, at the same state of charge, the charging rate adopted by the first type of battery cell is greater than or equal to the charging rate of the second type of battery cell, and the charging time of the first type of battery cell is less than or equal to the charging time of the second type of battery cell. Alternatively, for the first type of battery cell, different charging rates and corresponding charging times can be adopted at different states of charge. That is, in the charging process of the first type of battery cell from low power to full power, a uniform charging rate is not adopted. By adjusting the charging rate, the temperature change of the battery cell can be appropriately controlled to avoid overheating and cause thermal runaway. In addition, by limiting the corresponding charging time, the temperature rise caused by the long charging time of the battery cell at a high charging rate can be avoided. Similarly, for the charging process of the second type of battery cell, corresponding charging rates and charging times can be adopted for different states of charge, which will not be described here. As shown in Table 1 below, the charging rates and charging times adopted for the first type of battery cell and the second type of battery cell at different states of charge are shown as examples, which are only used as examples, and the specific charging rate and charging time are not limited.

[0073] Table 1

[0074]

[0075] From the example, it can be seen that the battery charging method of the application can charge the corresponding first type of battery cell and second type of battery cell according to different first normal charging rules and second normal charging rules in sequence according to the selected normal charging mode, meet the demand of fast charging and high capacity, and adopt a gentle charging rate to protect the service life of the battery cell; at the same time, by absorbing the heat of the first type of battery cell, the second type of battery cell can relieve the high temperature rise of the first type of battery cell during fast charging, and avoid the risk of thermal runaway.

[0076] Referring to Figure 6 and Figure 7 , the charging management device provided by an embodiment of the application can also be configured to execute the following battery charging method. The battery charging method of another embodiment of the application comprises:

[0077] S310, when detecting that the fast charging mode is triggered, charging the first type of battery cell according to the first fast charging rule.

[0078] S320, when detecting that the temperature of the second type of battery cell reaches the preset temperature, starting to synchronously charge the second type of battery cell according to the second fast charging rule.

[0079] S330, when the state of charge of the first type of battery cell or the second type of battery cell reaches a preset threshold, switching to a normal charging mode to charge the first type of battery cell according to a first normal charging rule and charge the second type of battery cell according to a second normal charging rule.

[0080] S340, when a preset power-off condition is reached, stopping charging the first type of battery cell and the second type of battery cell, respectively.

[0081] In this embodiment, when the charging management device receives a charging instruction in the fast charging mode, the first type of battery cell is preferentially started to be charged accordingly. In the fast charging mode, the charging rule of the same type of battery cell is different from the charging rule in the normal charging mode, so as to reduce the damage to the battery while adjusting the charging time required for full charging.

[0082] In an embodiment, the first fast charging rule includes that the first type of battery cell in the fast charging mode has different charging rates and charging times corresponding to different states of charge; and the second fast charging rule includes that the second type of battery cell in the fast charging mode has different charging rates and charging times corresponding to different states of charge. Taking the first type of battery cell as an example, the charging rate of the first fast charging rule is greater than or equal to the charging rate of the first normal charging rule, and the charging time of the first fast charging rule is less than the charging rate of the first normal charging rule, and the same applies to the second type of battery cell. As shown in Table 2 below, the charging rate and the charging time adopted for the first type of battery cell and the second type of battery cell at different states of charge are shown as examples, and the specific charging rate and the charging time are not limited. It can be understood that when the first type of battery cell charges the state of charge to the preset threshold according to the first fast charging rule, the first normal charging rule of the first normal charging mode is switched to continue charging. For example, the preset threshold is 80%, and the state of charge of the first type of battery cell is 80% to 100% charged according to the corresponding charging rate and charging time in Table 1 above until the preset power-off condition is reached; and the same applies to the second type of battery cell, which will not be described here. That is, the first type of battery cell and the second type of battery cell are switched to the normal charging mode to execute the corresponding normal charging rule according to their respective charging processes, without waiting. Of course, the preset threshold of the state of charge of the first type of battery cell and the second type of battery cell can be designed respectively, which is not limited here. Such a design can accelerate the charging of the first type of battery cell and the second type of battery cell through the fast charging mode to shorten the charging time, and use the normal charging mode for more gentle charging when approaching full, so as to reduce the damage to the battery cell and prolong the service life of the battery cell.

[0083] Table 2

[0084]

[0085] Correspondingly, in the fast charging mode, the charging can also be stopped according to the preset power-off condition in the normal charging mode, which will not be described herein.

[0086] As can be seen from the example, the battery charging method can charge the first type of battery cell and the second type of battery cell according to the different first fast charging rule and second fast charging rule in the selected fast charging mode, so as to shorten the charging time; and the charging is switched to the normal charging mode at the last state of charge to protect the battery cell and prolong the service life of the battery cell.

[0087] Corresponding to the foregoing application function implementation method embodiments, the application further provides a charging management device and a corresponding embodiment.

[0088] Referring to Figure 8 The charging management device shown in the embodiment of the application is applied to a charging management device, and the charging management device comprises a detection module 210 and a charging control module 220, wherein:

[0089] The charging control module 220 is configured to charge the first type of battery cell when the detection module 210 detects a charging instruction.

[0090] The charging control module 220 is further configured to start charging the second type of battery cell when the detection module 210 detects that the temperature of the second type of battery cell reaches a preset temperature.

[0091] Referring to Figure 9 In a specific embodiment, the detection module 210 comprises an instruction detection module 211, a temperature detection module 212 and a state-of-charge detection module 213; wherein the instruction detection module 211 is configured to detect charging instructions corresponding to different charging modes, and the charging modes comprise a normal charging mode and a fast charging mode. The temperature detection module 212 is configured to detect the temperature of the second type of battery cell. The state-of-charge detection module 213 is configured to detect the state of charge of the first type of battery cell and the second type of battery cell respectively.

[0092] The charging control module 220 comprises a first charging control module 221 and a second charging control module 222. The first charging control module 221 is configured to control the charging and stopping of charging of the first type of battery cell; and the second charging control module 222 is configured to control the charging and stopping of charging of the second type of battery cell.

[0093] In an embodiment, the first charging control module 221 is configured to charge the first type of battery cell according to a first normal charging rule when the instruction detection module 211 detects triggering of the normal charging mode; and the second charging control module 222 is configured to start charging the second type of battery cell according to a second normal charging rule when the temperature detection module 212 detects that the temperature of the second type of battery cell reaches a preset temperature.

[0094] In an embodiment, the first charging control module 221 is configured to charge the first type of battery cell according to the first fast charging rule when the instruction detection module 211 detects the trigger of the fast charging mode; and the second charging control module 222 is configured to start charging the second type of battery cell according to the second fast charging rule when the temperature detection module 212 detects that the temperature of the second type of battery cell reaches the preset temperature. In an embodiment, when the state of charge detection module 213 detects that the state of charge of the first type of battery cell or the second type of battery cell reaches the preset threshold, the first charging control module 221 and the second charging control module 222 are switched to the normal charging mode, respectively, to charge the first type of battery cell according to the first normal charging rule and to charge the second type of battery cell according to the second normal charging rule.

[0095] In an embodiment, the first charging control module 221 and the second charging control module 222 stop charging the first type of battery cell and the second type of battery cell, respectively, when the preset power-off condition is reached.

[0096] As to the apparatus in the above embodiments, the specific manners in which the respective modules perform operations have been described in detail in the embodiments of the method, and thus will not be described in detail here.

[0097] Figure 10 FIG. 1 is a structural schematic diagram of a charging management device according to an embodiment of the present application.

[0098] Referring to Figure 10 The charging management device 200 includes a memory 201 and a processor 202.

[0099] The processor 202 can be a central processing unit (CPU), and can also be other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor can also be any conventional processor.

[0100] The memory 201 can include various types of storage units, such as a system memory, a read-only memory (ROM), and a permanent storage device. Among them, the ROM can store static data or instructions required by the processor 202 or other modules of the computer. The permanent storage device can be a read-write storage device. The permanent storage device can be a non-volatile storage device that does not lose stored instructions and data even after the computer is powered off. In some embodiments, the permanent storage device uses a mass storage device (such as a magnetic or optical disk, a flash memory) as a permanent storage device. In some other embodiments, the permanent storage device can be a removable storage device (such as a floppy disk, an optical drive). The system memory can be a read-write storage device or a volatile read-write storage device, such as a dynamic random access memory. The system memory can store some or all of the instructions and data required by the processor during runtime. In addition, the memory 201 can include a combination of any computer readable storage media, including various types of semiconductor storage chips (such as DRAM, SRAM, SDRAM, flash memory, programmable read-only memory), magnetic disks and / or optical disks. In some embodiments, the memory 201 can include a read and / or write removable storage device, such as a compact disc (CD), a read-only digital versatile disc (such as DVD-ROM, double-layer DVD-ROM), a read-only Blu-ray disc, an ultra-density optical disc, a flash memory card (such as an SD card, a min SD card, a Micro-SD card, etc.), a magnetic floppy disk, etc. The computer readable storage medium does not include a carrier wave and an instantaneous electronic signal transmitted by wireless or wired transmission.

[0101] The memory 201 stores executable code, which, when processed by the processor 202, can cause the processor 202 to perform part or all of the above-mentioned methods.

[0102] In addition, the method according to the present application can also be implemented as a computer program or computer program product, which includes computer program code instructions for executing part or all of the steps of the above-mentioned methods of the present application.

[0103] Alternatively, the present application can also be implemented as a computer readable storage medium (or non-transitory machine readable storage medium or machine readable storage medium) having executable code (or computer program or computer instruction code) stored thereon, which, when executed by a processor of an electronic device (or server, etc.), causes the processor to execute part or all of the steps of the above-mentioned methods according to the present application.

[0104] Having described various embodiments of the application, it is to be understood that the above description is meant not to limit and not to encompass all of the possible embodiments. Many modifications and variations of this application can be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. It is intended that the scope of the application be defined by the scope of the patent and by the claims as allowed by the patent office, which can include adaptations based on the description, equivalents, and / or substitutions of elements individually or collectively to the entire disclosure.

Claims

1. A method of charging a battery, characterized by, The method comprises: charging the first type of battery cell when a charging instruction is detected; wherein, when a normal charging mode is triggered, the first type of battery cell is charged according to a first normal charging rule; when a fast charging mode is triggered, the first type of battery cell is charged according to a first fast charging rule; charging the second type of battery cell when the temperature of the second type of battery cell reaches a preset temperature; wherein, when the temperature of the second type of battery cell reaches the preset temperature, the second type of battery cell is charged according to a second normal charging rule or a second fast charging rule; the preset temperature is 35-50℃; when charging according to the fast charging mode, if the state of charge of the first type of battery cell or the second type of battery cell reaches a preset threshold, switching to the normal charging mode to charge the first type of battery cell according to a first normal charging rule and charge the second type of battery cell according to a second normal charging rule; wherein, different states of charge correspond to preset charging rates and charging durations; the heat generated by the first type of battery cell is used to preheat the second type of battery cell to the preset temperature; the maximum charge-discharge rate of the first type of battery cell is greater than that of the second type of battery cell; the energy density of the first type of battery cell is less than that of the second type of battery cell; at least part of the second type of battery cell is arranged adjacent to the first type of battery cell.

2. The battery charging method according to claim 1, wherein, The maximum charging rate of the first type of battery cell in the normal charging mode is 0.5-2.5C, and the maximum charging rate in the fast charging mode is 1-5C; The maximum charging rate of the second type of battery cell in the normal charging mode is 0.3-2C, and the maximum charging rate in the fast charging mode is 1-3C.

3. The battery charging method of claim 1, wherein: the preset threshold is 80%.

4. The battery charging method of claim 1, wherein, The method further comprises: stopping charging the first type of battery cell and the second type of battery cell when a preset power-off condition is reached; the first normal charging rule comprises different states of charge corresponding to preset charging rates and charging durations for the first type of battery cell in the normal charging mode; the second normal charging rule comprises different states of charge corresponding to preset charging rates and charging durations for the second type of battery cell in the normal charging mode; the first fast charging rule comprises different states of charge corresponding to preset charging rates and charging durations for the first type of battery cell in the fast charging mode; the second fast charging rule comprises different states of charge corresponding to preset charging rates and charging durations for the second type of battery cell in the fast charging mode.

5. A battery pack, characterized by, The battery comprises a plurality of first type of battery cells and a plurality of second type of battery cells, the plurality of first type of battery cells are connected in parallel and / or series with each other, the plurality of second type of battery cells are connected in parallel and / or series with each other, and the plurality of first type of battery cells and the plurality of second type of battery cells form a cycle unit; wherein: The maximum charge-discharge rate of the first type of battery cell is greater than that of the second type of battery cell, the energy density of the first type of battery cell is less than that of the second type of battery cell, and at least part of the second type of battery cell is arranged adjacent to the first type of battery cell. The battery pack is charged according to the battery charging method of any one of claims 1-4, the heat generated by the first type of battery cell is used to preheat the second type of battery cell to a preset temperature, and the preset temperature is 35-50°C.

6. The battery pack of claim 5, wherein: The first type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a manganese iron lithium phosphate / graphite system; The second type of battery cell is selected from a ternary / graphite system, an LFP / graphite system, a ternary / silicon-doped graphite system, or a manganese iron lithium phosphate / graphite system; The system of the first type of battery cell is the same as or different from that of the second type of battery cell; The first type of battery cell is a square cell, a cylindrical cell, or a blade cell; The second type of battery cell is a square cell, a cylindrical cell, or a blade cell; The shape and size of the first type of battery cell and the second type of battery cell are the same or different.

7. A charge management device, characterized by, Comprising: a processor; and a memory having executable code stored thereon, which, when executed by the processor, causes the processor to perform the battery charging method of any one of claims 1-4.

8. A power battery system, characterized in that, The charging management device of claim 7 is configured to perform charging management on the battery pack.

9. A vehicle characterized by comprising: The battery pack of any one of claims 5-6 or the power battery system of claim 8.

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