Battery stack activation method, device and vehicle

Abstract

The present invention discloses a method, device, and vehicle for activating a fuel cell stack. The method comprises: obtaining a rated current density of the fuel cell stack; determining multiple first current densities based on the rated current density; activating the fuel cell stack multiple times based on the multiple first current densities, second current densities, and third current densities; and determining that the fuel cell stack activation is successful in response to a cell voltage error in the activated fuel cell stack being less than a preset threshold. This invention addresses the technical problem of poor fuel cell stack activation in related technologies.

Description

Technical Field

[0001] The present invention relates to the field of battery stack activation, and in particular to a battery stack activation method, device and vehicle. Background Art

[0002] With the development of new energy vehicles, fuel cell stacks, as an important component of fuel cell vehicles, are in increasing demand over time. Currently, after the stacks are manufactured, they are usually activated to ensure that the stack performance is in the best condition before they are put into use in the vehicle. However, there are currently too many and complex methods for activating the stacks, and there is no unified and efficient activation method.

[0003] To address the above-mentioned problems, no effective solutions have been proposed so far. Summary of the Invention

[0004] Embodiments of the present invention provide a method, device, and vehicle for activating a fuel cell stack, so as to at least solve the technical problem of poor activation effect of a fuel cell stack in the related art.

[0005] According to one aspect of an embodiment of the present invention, a method for activating a battery stack is provided, comprising: obtaining a rated current density of the battery stack, wherein the rated current density is determined by the rated current of the battery stack and the battery stack area; determining a plurality of first current densities based on the rated current density, wherein different first current densities have different magnitudes; activating the battery stack multiple times based on the plurality of first current densities, second current densities, and third current densities, wherein the second current density is less than the rated current density, and the rated current density is less than the third current density; and determining that the activation of the battery stack is successful in response to a cell voltage error of the activated battery stack being less than a preset threshold.

[0006] Optionally, the fuel cell stack is activated multiple times based on multiple first current densities, second current densities and third current densities, including: activating the fuel cell stack multiple times based on multiple first current densities to obtain a first activation result; in response to the first activation result being activation completion, activating the fuel cell stack based on the second current density to obtain a second activation result; in response to the second activation result being activation completion, activating the fuel cell stack based on the third current density to obtain an activated fuel cell stack.

[0007] Optionally, the battery stack is activated multiple times based on multiple first current densities to obtain a first activation result, including: sorting the multiple first current densities in ascending order to obtain a current density sequence; activating the battery stack in sequence based on the current density sequence, wherein the time for each activation of the battery stack is a first preset time.

[0008] Optionally, in response to the first activation result being activation completion, the fuel cell stack is activated based on the second current density to obtain a second activation result, including: controlling the current current density of the fuel cell stack to be reduced to the second current density; activating the fuel cell stack according to a second preset time based on the second current density to obtain a second activation result, wherein the second preset time is greater than the first preset time.

[0009] Optionally, in response to the second activation result being activation completion, the fuel cell stack is activated based on a third current density, including: controlling the current density of the fuel cell stack to increase from the second current density to a third current density; and activating the fuel cell stack according to a second preset time based on the third current density.

[0010] Optionally, determining a plurality of first current densities based on the rated current density includes: determining a preset division interval based on the rated current density; and dividing the rated current density based on the preset division interval to obtain a plurality of first current densities.

[0011] Optionally, the method further includes: obtaining a voltage error of each single cell in the activated battery stack; performing standard deviation processing on the multiple voltage errors to obtain a single cell voltage error.

[0012] Optionally, the method also includes: in response to the cell voltage error being less than a preset threshold, activating the fuel cell stack according to a third preset time based on the rated current density, wherein the difference between the third preset time and the second preset time is greater than a preset value; in response to the cell voltage error being greater than or equal to the preset threshold, reactivating the fuel cell stack based on multiple first current densities, second current densities and third current densities.

[0013] According to another aspect of an embodiment of the present invention, a battery stack activation device is also provided, including: an acquisition module for acquiring the rated current density of the battery stack, wherein the rated current density is determined by the rated current of the battery stack and the battery stack area; a first determination module for determining multiple first current densities based on the rated current density, wherein different first current densities have different sizes; an activation module for activating the battery stack multiple times based on the multiple first current densities, the second current density and the third current density, wherein the second current density is less than the rated current density, and the rated current density is less than the third current density; a second determination module for determining that the battery stack activation is successful in response to the cell voltage error of the activated battery stack being less than a preset threshold.

[0014] Optionally, the activation module includes: a first activation unit, used to activate the fuel cell stack multiple times based on multiple first current densities to obtain a first activation result; a second activation unit, used to activate the fuel cell stack based on a second current density in response to the first activation result being activation completion to obtain a second activation result; a third activation unit, used to activate the fuel cell stack based on a third current density in response to the second activation result being activation completion to obtain an activated fuel cell stack.

[0015] Optionally, the first activation unit is further used to: sort multiple first current densities in ascending order to obtain a current density sequence; activate the battery stack in sequence based on the current density sequence, wherein the time for each activation of the battery stack is a first preset time.

[0016] Optionally, the second activation unit is also used to: control the current current density of the fuel cell stack to be reduced to a second current density; activate the fuel cell stack according to a second preset time based on the second current density to obtain a second activation result, wherein the second preset time is greater than the first preset time.

[0017] Optionally, the third activation unit is further used to: control the current density of the fuel cell stack to increase from the second current density to a third current density; and activate the fuel cell stack according to a second preset time based on the third current density.

[0018] Optionally, the first determination module includes: a determination unit, configured to determine a preset division interval based on the rated current density; and a division unit, configured to divide the rated current density based on the preset division interval to obtain a plurality of first current densities.

[0019] Optionally, the device further includes: an error acquisition module for acquiring the voltage error of each single cell in the activated battery stack; and a standard deviation processing module for performing standard deviation processing on multiple voltage errors to obtain a single cell voltage error.

[0020] Optionally, the device also includes: a second activation module, for activating the fuel cell stack according to a third preset time based on the rated current density in response to a cell voltage error being less than a preset threshold, wherein the difference between the third preset time and the second preset time is greater than a preset value; a reactivation module, for reactivating the fuel cell stack based on multiple first current densities, second current densities and third current densities in response to a cell voltage error being greater than or equal to a preset threshold.

[0021] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, comprising a stored program, wherein when the program is run, the device where the computer-readable storage medium is located is controlled to execute the stack activation method in the above embodiment.

[0022] According to another aspect of an embodiment of the present invention, a processor is further provided, wherein when a program of the processor is running, the stack activation method in the above embodiment is executed.

[0023] According to another aspect of an embodiment of the present invention, a vehicle is also provided, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by one or more processors, the one or more processors perform the battery stack activation in the above embodiment.

[0024] In an embodiment of the present invention, the rated current density of the battery stack is obtained; multiple first current densities are determined based on the rated current density; the battery stack is activated multiple times based on the multiple first current densities, second current densities and third current densities; in response to the cell voltage error of the activated battery stack being less than a preset threshold, the successful activation of the battery stack is determined, the efficiency of activating the battery stack is improved by using current density as a battery stack activation parameter, and the battery stack is repeatedly activated using multiple first current densities, second current densities and third current densities of different sizes, and the battery stack activation is determined to be complete only when the cell voltage error of the activated battery stack is less than the preset threshold, which can effectively improve the activation effect of the activated battery stack, thereby solving the technical problem of poor battery stack activation effect in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is a schematic diagram illustrating a method for activating a battery stack according to an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram showing a detailed method for activating a battery stack according to an embodiment of the present invention;

[0028] Figure 3 is a schematic diagram showing a comparison of activation effects of a battery stack according to an embodiment of the present invention;

[0029] Figure 4 4 is a structural block diagram of a fuel cell stack activation device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0032] Example 1

[0033] According to an embodiment of the present invention, an embodiment of a method for activating a battery stack is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0034] Figure 1 FIG. 1 is a schematic diagram of a stack activation method according to an embodiment of the present invention. Figure 1 As shown, the method includes the following steps:

[0035] Step S102: Obtain the rated current density of the fuel cell stack.

[0036] Among them, the rated current density is determined by the rated current of the battery stack and the battery stack area.

[0037] The rated current density of the stack can be determined by the rated current of the stack and the stack area. For example, assuming the rated current of the stack is 150A and the area is 300cm 2 , then the current density of the stack can be 0.5A / m 2 .

[0038] In an optional solution of this embodiment, in order to improve the efficiency of stack activation, the stack can be activated using current density as an activation parameter.

[0039] Step S104: determining a plurality of first current densities based on the rated current density.

[0040] The first current densities are of different sizes.

[0041] The first current density may refer to a plurality of current densities of different sizes used to activate the fuel cell stack.

[0042] Currently, most methods of activating the fuel cell stack using current density use a fixed current density to repeatedly activate the fuel cell stack. However, this method is too simple and has a poor activation effect on the fuel cell stack. Therefore, in an optional scheme of this embodiment, when activating the fuel cell stack based on current density, you can first divide it into multiple first current densities of different sizes according to the above-mentioned rated current density, and use these first current densities to activate the fuel cell stack.

[0043] Step S106 , activating the fuel cell stack multiple times based on the multiple first current densities, the second current densities, and the third current densities.

[0044] The second current density is less than the rated current density, and the rated current density is less than the third current density.

[0045] The above-mentioned second current density may refer to the minimum current density that can drive the fuel cell stack to operate. Generally, the second current density is less than the above-mentioned rated current density.

[0046] The third current density may refer to the maximum current density that the fuel cell stack can withstand during operation. Generally, the third current density is greater than the aforementioned rated current density.

[0047] In an optional scheme of this embodiment, in addition to using multiple first current densities of different sizes to activate the fuel cell stack, considering that the state of the fuel cell stack during operation may be unstable and may be affected by environmental factors such as temperature and humidity, the current density of the fuel cell stack may fluctuate around the rated current density at certain moments, and the fluctuation range may even be very large. Therefore, in order to improve the adaptability of the fuel cell stack during operation, the above-mentioned second current density and third current density can be used simultaneously to activate the fuel cell stack.

[0048] Step S108 , in response to the cell voltage error of the activated stack being less than a preset threshold, determining that the stack activation is successful.

[0049] The aforementioned single cell voltage error may refer to the voltage error value of each single cell in the battery stack.

[0050] The above-mentioned preset threshold value may refer to an error threshold value obtained by performing voltage error tests on multiple other fuel cell stacks. It should be noted that the types of the multiple other fuel cell stacks are the same as that of the current fuel cell stack and have been activated.

[0051] For example, you can first perform multiple voltage tests on 20 other preset battery stacks, and subtract the multiple voltage test results of each battery stack from the rated voltage to determine the multiple measurement errors corresponding to each battery stack. Then, based on the average value of the multiple measurement errors and the number of single cells in the corresponding battery stack, determine the single cell voltage error value of the corresponding battery stack. Finally, after obtaining the single cell voltage error values ​​of all other battery stacks, the standard deviation of these single cell error values ​​can be used as the above-mentioned preset threshold.

[0052] It should be noted that the above-mentioned process of determining the preset threshold is only an example display, and the specific determination method can be determined according to actual conditions and is not limited here.

[0053] In an optional solution of this embodiment, in order to improve the accuracy of determining whether the stack activation is successful, the cell voltage of each single cell in the stack can be detected, and the preset standard voltage value and the cell voltage can be processed to obtain the above-mentioned voltage error value.

[0054] In an optional solution of this embodiment, the stack activation is determined to be successful only when the voltage error value is less than a preset threshold.

[0055] In an embodiment of the present invention, the rated current density of the battery stack is obtained; multiple first current densities are determined based on the rated current density; the battery stack is activated multiple times based on the multiple first current densities, second current densities and third current densities; in response to the cell voltage error of the activated battery stack being less than a preset threshold, the successful activation of the battery stack is determined, the efficiency of activating the battery stack is improved by using current density as a battery stack activation parameter, and the battery stack is repeatedly activated using multiple first current densities, second current densities and third current densities of different sizes, and the battery stack activation is determined to be complete only when the cell voltage error of the activated battery stack is less than the preset threshold, which can effectively improve the activation effect of the activated battery stack, thereby solving the technical problem of poor battery stack activation effect in related technologies.

[0056] Optionally, the fuel cell stack is activated multiple times based on multiple first current densities, second current densities and third current densities, including: activating the fuel cell stack multiple times based on multiple first current densities to obtain a first activation result; in response to the first activation result being activation completion, activating the fuel cell stack based on the second current density to obtain a second activation result; in response to the second activation result being activation completion, activating the fuel cell stack based on the third current density to obtain an activated fuel cell stack.

[0057] In an optional solution of this embodiment, considering that multiple first current densities are divided by rated current density, and rated current density is a standard parameter of the fuel cell stack, the multiple first current densities can be used to activate the fuel cell stack first to obtain multiple first activation results.

[0058] In an optional solution of this embodiment, considering that the current density of the fuel cell stack increases gradually from small to large during operation, after activating the fuel cell stack using the first current density, the fuel cell stack can be further activated using the second current density to obtain a second activation result.

[0059] In an optional scheme of this embodiment, considering that the third current density is the maximum current density that the entire fuel cell stack can withstand and is difficult to achieve during the operation of the fuel cell stack, after activating the fuel cell stack using the second current density, the fuel cell stack can be further activated using the third current density to obtain the final activated fuel cell stack.

[0060] In an optional scheme of this embodiment, each time an activation result is obtained, the activation result can be compared with the activation results of other activated fuel cells. If the difference in the activation results is too large, it means that there may be a problem in the activation process of the current fuel cell. The staff can reactivate the fuel cell based on the activation result with the problem.

[0061] For example, after activating the fuel cell stack using a first current density and obtaining a corresponding first activation result, the first activation result can be recorded, and then other fuel cell stacks of the same type as the current fuel cell stack that have been activated can be obtained from a preset database, along with the completed activation results at the current first current density. The above-mentioned first activation result can be compared with the completed activation result. If the difference between the two is too large, for example, the difference between the two is greater than a preset stability threshold, it means that after activating the current fuel cell stack with the current first current density, the activation effect will not be good, and the stability of the current fuel cell stack after activation is poor. At this time, the current first current density can be used to reactivate the current fuel cell stack.

[0062] It should be noted that the above activation results may include but are not limited to: stack current, stack voltage, etc., without specific limitation.

[0063] Optionally, the battery stack is activated multiple times based on multiple first current densities to obtain a first activation result, including: sorting the multiple first current densities in ascending order to obtain a current density sequence; activating the battery stack in sequence based on the current density sequence, wherein the time for each activation of the battery stack is a first preset time.

[0064] In an optional scheme of this embodiment, in order to improve the effect of activating the battery stack, the aforementioned multiple first current densities can be sorted in ascending order to obtain the above-mentioned current density sequence, and the battery stack can be activated in sequence according to the current densities in the current density sequence, so as to ensure that the span of the battery stack during each activation is not too large, thereby ensuring the safety and stability of the battery stack during activation.

[0065] In an optional solution of this embodiment, in order to improve the activation efficiency of the battery stack, the time for activating the battery stack using multiple first current densities can be made the same, that is, when the battery stack is activated based on the above-mentioned current density sequence, the time for each activation of the battery stack is the first preset time, for example, 3 minutes.

[0066] Optionally, in response to the first activation result being activation completion, the fuel cell stack is activated based on the second current density to obtain a second activation result, including: controlling the current current density of the fuel cell stack to be reduced to the second current density; activating the fuel cell stack according to a second preset time based on the second current density to obtain a second activation result, wherein the second preset time is greater than the first preset time.

[0067] After the activation of the battery stack is completed using the aforementioned current density sequence, the current density used to activate the battery stack can be controlled to decrease to the aforementioned second current density, and the battery can be activated using the second current density.

[0068] In an optional solution of this embodiment, since the fuel cell stack may be damaged if it continues to operate at the second current density, the fuel cell stack can be activated with a longer second preset time, which is greater than the aforementioned first preset time, for example 5 minutes.

[0069] Optionally, in response to the second activation result being activation completion, the fuel cell stack is activated based on a third current density, including: controlling the current density of the fuel cell stack to increase from the second current density to a third current density; and activating the fuel cell stack according to a second preset time based on the third current density.

[0070] Similar to the aforementioned second current density, since the fuel cell stack may be damaged if it continues to operate at the third current density, when the fuel cell stack is activated using the third current density, the activation time may also be the aforementioned second preset time.

[0071] Optionally, determining a plurality of first current densities based on the rated current density includes: determining a preset division interval based on the rated current density; and dividing the rated current density based on the preset division interval to obtain a plurality of first current densities.

[0072] In an optional scheme of this embodiment, in order to avoid excessive differences between different current densities, which may damage the battery stack when activating the battery stack using different current densities, a preset division interval can be first determined based on the aforementioned rated current density. The value of the preset division interval will not be very large, and then the preset division interval can be used to divide the rated current density to obtain the above-mentioned multiple first current densities.

[0073] For example, if the rated current density of the stack is 0.5A / m 2 , then the above preset division interval can be determined as 0.1A / m 2 , to divide the rated current density into multiple first current densities: 0.1A / m 2 , 0.2A / m 2 , 0.3A / m 2 , 0.4A / m 2 , 0.5A / m 2 .

[0074] Then, the fuel cell stack is activated step by step from small to large according to these first current densities until the fuel cell stack can operate well at the rated current density.

[0075] Optionally, the method further includes: obtaining a voltage error of each single cell in the activated battery stack; performing standard deviation processing on the multiple voltage errors to obtain a single cell voltage error.

[0076] In an optional solution of this embodiment, the aforementioned single cell voltage error may refer to a standard deviation corresponding to each single cell.

[0077] It should be noted that the above standard deviation is only an exemplary display and can also be an average value, square difference, etc., which can be determined based on actual conditions and is not limited here.

[0078] Optionally, the method also includes: in response to the cell voltage error being less than a preset threshold, activating the fuel cell stack according to a third preset time based on the rated current density, wherein the difference between the third preset time and the second preset time is greater than a preset value; in response to the cell voltage error being greater than or equal to the preset threshold, reactivating the fuel cell stack based on multiple first current densities, second current densities and third current densities.

[0079] In an optional scheme of this embodiment, if the determined single cell voltage error is less than a preset threshold, for example, the determined standard deviation is less than 5mV, it can be determined that the current activation of the battery stack using the aforementioned first current density, second current density and third current density is successful. At this time, in order to further improve the stability of the battery stack, the battery stack can be re-activated with the rated current density and the battery stack activation state can be maintained according to the above-mentioned third preset time.

[0080] In an alternative solution of this embodiment, since the stack activation is successful, to ensure the activation stability of the stack, the third preset time can be much longer than the first and second preset times. That is, the difference between the third preset time and the second preset time is greater than a preset value, and the preset value is longer than the second preset time. For example, if the first preset time is 3 minutes and the second preset time is 5 minutes, the third preset time can be 20 minutes.

[0081] In an optional scheme of this embodiment, if the determined single cell voltage error is greater than or equal to a preset threshold, it means that there is a problem with the current activation of the fuel cell stack. At this time, the aforementioned multiple first current densities, second current densities and third current densities can be used to reactivate the fuel cell stack to improve the activation effect of the fuel cell stack.

[0082] In an optional solution of this embodiment, if there is a problem with the activation of the fuel cell stack, considering that the stability of the fuel cell stack is higher when activated using multiple first current densities, in order to improve the activation efficiency, the fuel cell stack can be directly reactivated using the second current density and the third current density.

[0083] Figure 2 This is a schematic diagram showing a detailed method for stack activation according to an embodiment of the present invention. For ease of understanding, Figure 2 As shown, after running the stack activation program, the rated current of the stack can be first divided according to the preset division intervals, and the stack can be gradually activated according to the divided multiple first current densities, and each activation time is the first preset time; then the stack can be activated according to the second current density, and the activation time is the second preset time; then the stack can be activated according to the third current density, and the activation time is also the third preset time. After activating the current using the third current density, the program can further determine whether the cell voltage error of each single cell in the stack is less than the preset threshold. If it is less than, it means that the stack activation is successful. At this time, in order to further improve the stability of the activated stack, the stack can be continuously activated for the third preset time at the rated current density; if it is greater than, it means that the stack activation has failed. At this time, the above steps can be repeated to reactivate the stack until the above-mentioned cell voltage error is less than the preset value.

[0084] Figure 3 FIG. 1 is a schematic diagram showing a comparison of activation effects of a stack according to an embodiment of the present invention. Figure 3As shown, the solid line represents the original activation method, and the dotted line represents the above-mentioned stack activation method. The same type of stack is activated by these two activation methods in the same activation environment and activation time. The left side is the current-time comparison effect diagram of the activated stack, and the right side is the voltage-current comparison effect diagram after activation. Figure 3 It can be clearly seen that the average single cell voltage of the battery stack activated according to the above-mentioned battery stack activation method is higher and the overall performance is better.

[0085] Example 2

[0086] According to another aspect of the embodiment of the present invention, corresponding to the above-mentioned embodiment of the stack activation method, this specification also provides a stack activation device, please refer to Figure 4 , Figure 4 It is a structural block diagram of a battery stack activation device shown in an embodiment of the present invention, the device includes: an acquisition module 402, used to obtain the rated current density of the battery stack, wherein the rated current density is determined by the rated current of the battery stack and the battery stack area; a first determination module 404, used to determine multiple first current densities based on the rated current density, wherein different first current densities have different sizes; an activation module 406, used to activate the battery stack multiple times based on multiple first current densities, second current densities and third current densities, wherein the second current density is less than the rated current density, and the rated current density is less than the third current density; a second determination module 408, used to determine that the battery stack activation is successful in response to the cell voltage error of the activated battery stack being less than a preset threshold.

[0087] Optionally, the activation module 406 includes: a first activation unit, used to activate the fuel cell stack multiple times based on multiple first current densities to obtain a first activation result; a second activation unit, used to activate the fuel cell stack based on a second current density in response to the first activation result being activation completion to obtain a second activation result; and a third activation unit, used to activate the fuel cell stack based on a third current density in response to the second activation result being activation completion to obtain an activated fuel cell stack.

[0088] Optionally, the first activation unit is further used to: sort multiple first current densities in ascending order to obtain a current density sequence; activate the battery stack in sequence based on the current density sequence, wherein the time for each activation of the battery stack is a first preset time.

[0089] Optionally, the second activation unit is also used to: control the current current density of the fuel cell stack to be reduced to a second current density; activate the fuel cell stack according to a second preset time based on the second current density to obtain a second activation result, wherein the second preset time is greater than the first preset time.

[0090] Optionally, the third activation unit is further used to: control the current density of the fuel cell stack to increase from the second current density to a third current density; and activate the fuel cell stack according to a second preset time based on the third current density.

[0091] Optionally, the first determining module 404 includes: a determining unit, configured to determine a preset division interval based on the rated current density; and a division unit, configured to divide the rated current density based on the preset division interval to obtain a plurality of first current densities.

[0092] Optionally, the device further includes: an error acquisition module for acquiring the voltage error of each single cell in the activated battery stack; and a standard deviation processing module for performing standard deviation processing on multiple voltage errors to obtain a single cell voltage error.

[0093] Optionally, the device also includes: a second activation module, for activating the fuel cell stack according to a third preset time based on the rated current density in response to a cell voltage error being less than a preset threshold, wherein the difference between the third preset time and the second preset time is greater than a preset value; a reactivation module, for reactivating the fuel cell stack based on multiple first current densities, second current densities and third current densities in response to a cell voltage error being greater than or equal to a preset threshold.

[0094] Example 3

[0095] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, comprising a stored program, wherein when the program is run, the device where the computer-readable storage medium is located is controlled to execute the stack activation method in the above embodiment.

[0096] Example 4

[0097] According to another aspect of an embodiment of the present invention, a processor is further provided, wherein when a program of the processor is running, the stack activation method in the above embodiment is executed.

[0098] Example 5

[0099] According to another aspect of an embodiment of the present invention, a vehicle is also provided, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by one or more processors, the one or more processors perform the battery stack activation in the above embodiment.

[0100] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0101] In the above embodiments of the present invention, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0102] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0103] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected to achieve the purpose of the present embodiment according to actual needs.

[0104] In addition, the functional units in the various embodiments of the present invention may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0105] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server or network device, etc.) to execute all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store program codes.

[0106] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for activating a battery stack, characterized in that: The method comprises: Obtaining a rated current density of the battery stack, wherein the rated current density is determined by the rated current of the battery stack and the battery stack area; determining a plurality of first current densities based on the rated current density, wherein different first current densities have different magnitudes; activating the fuel cell stack multiple times based on the multiple first current densities, second current densities, and third current densities, wherein the second current density is less than the rated current density, the rated current density is less than the third current density, the second current density is a minimum current density for driving the fuel cell stack, and the third current density is a maximum current density that the fuel cell stack can withstand during operation; In response to a cell voltage error of the activated stack being less than a preset threshold, determining that the stack activation is successful, wherein the preset threshold includes at least a standard deviation of the cell voltage errors of other preset stacks, where the other preset stacks are used to represent other preset stacks of the same type as the stack and have been activated; The method of activating the fuel cell stack multiple times based on the multiple first current densities, the second current density, and the third current density comprises: activating the fuel cell stack multiple times based on the multiple first current densities to obtain a first activation result; and activating the fuel cell stack multiple times based on the second current density and the third current density according to the first activation result; Activating the battery stack multiple times based on the multiple first current densities to obtain a first activation result, including: sorting the multiple first current densities in ascending order to obtain a current density sequence; activating the battery stack in sequence based on the current density sequence, wherein each activation time of the battery stack is a first preset time; According to the first activation result, the fuel cell stack is activated multiple times based on the second current density and the third current density, including: in response to the first activation result being activation completion, the fuel cell stack is activated based on the second current density to obtain a second activation result; in response to the second activation result being activation completion, the fuel cell stack is activated based on the third current density to obtain the activated fuel cell stack; After activating the fuel cell stack multiple times based on the multiple first current densities to obtain a first activation result, the method further includes: recording the first activation result and obtaining, from a preset database, completed activation results of the preset other fuel cell stacks at the first current density; comparing the first activation result with the completed activation result to obtain a difference between the first activation result and the completed activation result; and in response to the difference being greater than a preset stability threshold, reactivating the fuel cell stack based on the multiple first current densities; In response to the first activation result being activation completion, activating the fuel cell stack based on the second current density to obtain a second activation result, including: controlling the current density of the fuel cell stack to decrease to the second current density; activating the fuel cell stack based on the second current density for a second preset time to obtain the second activation result, wherein the second preset time is greater than the first preset time; Determining a plurality of first current densities based on the rated current density includes: determining a preset division interval based on the rated current density; and dividing the rated current density based on the preset division interval to obtain the plurality of first current densities.

2. The method according to claim 1, characterized in that In response to the second activation result being activation completion, activating the fuel cell stack based on the third current density, comprising: controlling the current density of the fuel cell stack to increase from the second current density to the third current density; The fuel cell stack is activated according to the third current density and a second preset time.

3. The method according to claim 1, characterized in that The method further comprises: Obtaining a voltage error of each cell in the activated battery stack; Standard deviation processing is performed on the multiple voltage errors to obtain the single cell voltage error.

4. The method according to claim 3, characterized in that The method further comprises: In response to the cell voltage error being less than the preset threshold, activating the fuel cell stack according to a third preset time based on the rated current density, wherein a difference between the third preset time and the second preset time is greater than a preset value; In response to the cell voltage error being greater than or equal to the preset threshold, the fuel cell stack is reactivated based on the plurality of first current densities, second current densities, and third current densities.

5. A stack activation device, characterized in that: The device comprises: an acquisition module, configured to acquire a rated current density of the battery stack, wherein the rated current density is determined by the rated current of the battery stack and the battery stack area; a first determining module, configured to determine a plurality of first current densities based on the rated current density, wherein different first current densities have different magnitudes; an activation module, configured to perform multiple activations on the fuel cell stack based on the multiple first current densities, the second current density, and the third current density, wherein the second current density is less than the rated current density, the rated current density is less than the third current density, the second current density is a minimum current density for driving the fuel cell stack, and the third current density is a maximum current density that the fuel cell stack can withstand during operation; a second determining module, configured to determine that activation of the battery stack is successful in response to a cell voltage error of the activated battery stack being less than a preset threshold, wherein the preset threshold includes at least a standard deviation of cell voltage errors of other preset battery stacks, the other preset battery stacks being used to represent other preset battery stacks of the same type as the battery stack and having been activated; The activation module is further configured to: activate the fuel cell stack multiple times based on the multiple first current densities to obtain a first activation result; and activate the fuel cell stack multiple times based on the second current density and the third current density according to the first activation result; The activation module is further configured to: sort the plurality of first current densities in ascending order to obtain a current density sequence; and activate the battery stack in sequence based on the current density sequence, wherein each activation time of the battery stack is a first preset time; The activation module is further configured to activate the fuel cell stack multiple times based on the second current density and the third current density according to the first activation result through the following steps: in response to the first activation result being activation completion, activating the fuel cell stack based on the second current density to obtain a second activation result, including: controlling the current current density of the fuel cell stack to decrease to the second current density; activating the fuel cell stack according to a second preset time based on the second current density to obtain the second activation result, wherein the second preset time is greater than the first preset time; in response to the second activation result being activation completion, activating the fuel cell stack based on the third current density to obtain the activated fuel cell stack; After activating the fuel cell stack multiple times based on the multiple first current densities to obtain a first activation result, the device is further configured to: record the first activation result and obtain completed activation results of the preset other fuel cell stacks at the first current density from a preset database; compare the first activation result with the completed activation result to obtain a difference between the first activation result and the completed activation result; and in response to the difference being greater than a preset stability threshold, reactivate the fuel cell stack based on the multiple first current densities; The first determination module is further configured to determine a plurality of first current densities based on the rated current density by: determining a preset division interval based on the rated current density; and dividing the rated current density based on the preset division interval to obtain the plurality of first current densities.

6. A vehicle comprising: at least one processor; as well as a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the stack activation method according to any one of claims 1 to 4.

Images