Feedback process protection method and device, computer program product and new energy automobile

Abstract

The invention discloses a feedback process protection method and device, a computer program product and a new energy automobile, and belongs to the field of new energy automobiles. The method comprises the steps of judging whether the new energy automobile enters an energy feedback working condition; responding to the energy feedback working condition of the new energy automobile, and judging whether the real-time battery cell voltage of the new energy automobile is smaller than the battery cell plateau period voltage or not; in response to the fact that the real-time battery cell voltage of the new energy automobile is not smaller than the battery cell platform period voltage, a feedback power instruction is generated according to the real-time battery cell voltage and a preset voltage threshold set, and the feedback power instruction is used for enabling a motor of the new energy automobile to reduce feedback power according to the feedback power instruction; each preset voltage threshold value in the preset voltage threshold value group is greater than the plateau phase voltage of the battery cell. The device comprises a feedback working condition judgment module, a cell platform period voltage judgment module and a power instruction generation module. The over-charge and over-voltage protection of the battery cell under the energy feedback working condition is realized, the feedback electric energy can be greatly recycled, and the cruising ability of the whole vehicle is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and in particular relates to a feedback process protection method, device, computer program product and new energy vehicle. Background Art

[0002] In the field of new energy vehicle technology, BMS (Battery Management System) will protect the battery cells. After the new energy vehicle is fully charged, if it enters a long downhill condition, the vehicle will recover kinetic energy under this condition, and the negative feedback current will directly enter the battery of the new energy vehicle, causing the battery to enter a quasi-charging state. When the temperature of the battery cell is low and the internal resistance of the battery cell is too large, the battery cell voltage will be overvoltage during the kinetic energy recovery process. Usually, when the battery cell is overvoltage, it involves safety during fault design, and the fault level is relatively high. When the BMS is protected, a fault will be reported, which makes it impossible to use the vehicle normally. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a feedback overcharge protection method, which is applied to new energy vehicles. The method includes:

[0004] Determine whether the new energy vehicle enters the energy feedback condition; in response to the new energy vehicle entering the energy feedback condition, determine whether the real-time battery cell voltage of the new energy vehicle is less than the battery cell plateau voltage; in response to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage, generate a feedback power instruction according to the real-time battery cell voltage and a preset voltage threshold group, the feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction, the preset voltage threshold group includes at least one preset voltage threshold, and each preset voltage threshold in the preset voltage threshold group is greater than the battery cell plateau voltage.

[0005] In the method as described above, optionally, the preset voltage threshold group includes: a first preset voltage threshold;

[0006] The generating of the feedback power instruction according to the real-time battery cell voltage and the preset voltage threshold group includes: judging whether the real-time battery cell voltage is greater than the first preset voltage threshold; in response to the real-time battery cell voltage being not greater than the first preset voltage threshold, generating a first feedback power instruction including a first power threshold, the first feedback power instruction being used to make the motor of the new energy vehicle reduce the feedback power to the first power threshold according to the first feedback power instruction; in response to the real-time battery cell voltage being greater than the first preset voltage threshold, generating a second feedback power instruction including a second power threshold, the second feedback power instruction being used to make the motor of the new energy vehicle reduce the feedback power to the second power threshold according to the second feedback power instruction, the second power threshold being 0.

[0007] In the method described above, optionally, the first feedback power instruction also includes a first preset time, and the first feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a first power threshold within the first preset time according to the first feedback power instruction.

[0008] In the method described above, optionally, the second feedback power instruction also includes a second preset time, and the second feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a second power threshold within the second preset time according to the second feedback power instruction, and the second preset time is less than the first preset time.

[0009] In the method as described above, optionally, the preset voltage threshold group further includes: a second preset voltage threshold, the second preset voltage threshold being smaller than the first preset voltage threshold;

[0010] In response to the real-time cell voltage of the new energy vehicle being greater than or equal to the cell plateau voltage, before determining whether the real-time cell voltage is greater than the first preset voltage threshold, the method further includes:

[0011] Determine whether the real-time battery cell voltage is greater than the second preset voltage threshold; in response to the real-time battery cell voltage being not greater than the second preset voltage threshold, generate a third feedback power instruction including a third power threshold, the third feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to the third power threshold according to the third feedback power instruction, and the third power threshold is greater than the first power threshold and the second power threshold; in response to the real-time battery cell voltage being greater than the second preset voltage threshold, jump to the step of determining whether the real-time battery cell voltage is greater than the first preset voltage threshold.

[0012] In the method described above, optionally, the third regenerative power instruction also includes a third preset time, and the third regenerative power instruction is used to enable the motor of the new energy vehicle to reduce the regenerative power to a third power threshold within the third preset time according to the third regenerative power instruction.

[0013] In the method described above, optionally, the first preset voltage threshold is less than the cell cut-off voltage.

[0014] Another aspect of the present invention provides a feedback overcharge protection device, which is applied to new energy vehicles, and the device comprises:

[0015] A feedback operating condition judgment module is used to judge whether the new energy vehicle enters the energy feedback operating condition; a battery cell plateau voltage judgment module is used to judge whether the real-time battery cell voltage of the new energy vehicle is less than the battery cell plateau voltage in response to the new energy vehicle entering the energy feedback operating condition; a power instruction generation module is used to generate a feedback power instruction according to the real-time battery cell voltage and a preset voltage threshold group in response to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage, the feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction, the preset voltage threshold group includes at least one preset voltage threshold, and each preset voltage threshold in the preset voltage threshold group is greater than the battery cell plateau voltage.

[0016] Yet another aspect of the present invention provides an electronic device, comprising: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned feedback overcharging protection method.

[0017] On the other hand, the present invention provides a computer-readable storage medium, which stores at least one instruction, at least one program, code set or instruction set. The at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the above-mentioned feedback overcharge protection method.

[0018] In another aspect, the present invention provides a computer program product comprising instructions, and when the computer program product is run on a computer, each step in the aforementioned feedback overcharge protection method and various possible implementations is executed by the computer.

[0019] In yet another aspect, the present invention provides a new energy vehicle, which includes the above-mentioned feedback overcharging protection device.

[0020] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0021] When the real-time battery cell voltage exceeds the battery cell platform voltage, measures to reduce the feedback power are not taken immediately. Instead, the real-time battery cell voltage continues to be detected, and the real-time battery cell voltage is compared with each preset voltage threshold in the preset voltage threshold group that exceeds the battery cell platform voltage. Based on the comparison result, a feedback power instruction is generated to instruct the reduction of the feedback power. This not only realizes overcharge and overvoltage protection for the battery cell under energy feedback conditions, but also can greatly recover the feedback electric energy and improve the endurance of the entire vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic flow chart of a feedback overcharge protection method provided by an embodiment of the present invention;

[0023] Figure 2 A schematic structural diagram of a feedback overcharge protection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 described embodiments are 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 creative work are within the scope of protection of the present invention.

[0025] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0026] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0027] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if determining" or "if monitoring (stated condition or event)" may be interpreted as "when determining" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0028] It should be noted that the limitations such as "first" and "second" involved in the embodiments of the present invention do not have limitations in terms of size, order and quantity, and are only used to distinguish them in name. For example, "first preset voltage threshold" and "second preset voltage threshold" are used to distinguish two different preset voltage thresholds, and "first preset time", "second preset time" and "third preset time" are used to distinguish three different preset time values.

[0029] See also Figure 1 The embodiment of the present invention provides a feedback overcharge protection method, which is applied to new energy vehicles. The method includes the following steps:

[0030] Step 101, determining whether the new energy vehicle enters an energy feedback condition.

[0031] The energy feedback condition refers to the condition in which the new energy vehicle will recover its own kinetic energy, and the negative feedback current directly enters the battery of the new energy vehicle to charge the battery. It should be noted that the charging under this condition is different from charging the battery through the charging interface. The charging under this condition can be called a quasi-charging state. This condition generally occurs when the new energy vehicle is braking or decelerating. During implementation, it can be judged by detecting the current direction of the battery and whether the charging interface is in a charging state. The current direction of the battery includes: the current direction of the battery discharge and the current direction of the battery charging. The current direction of the battery discharge is set to negative in advance, and the current direction of the charging is set to positive. When the charging interface is not in a charging state and the current direction is negative, it is judged whether the new energy vehicle enters the energy feedback condition. The judgment of the current direction of the battery can be achieved by detecting the current direction of the high-voltage bus by a current sensor.

[0032] Step 102 , in response to the new energy vehicle entering an energy feedback operating condition, determining whether the real-time cell voltage of the new energy vehicle is less than the cell plateau voltage.

[0033] The cell plateau voltage refers to the voltage output by the cell being stable within a range when the battery is in normal working condition, for example, 3.4V to 3.5V. This embodiment does not limit the specific value of the cell plateau voltage, and it can be calibrated according to the specific cell.

[0034] When the new energy vehicle enters the energy feedback condition, the real-time cell voltage of the new energy vehicle will change. The voltage of the cell is collected in real time by the voltage collection unit, and compared with the cell plateau voltage to determine the comparison result: whether the real-time cell voltage is less than the cell plateau voltage. This embodiment does not limit the specific structure and method of the voltage collection unit to collect voltage, which can be a prior art. Since the cell plateau voltage is a range value, when it is compared with the real-time cell voltage, a comparison threshold is usually selected from the cell plateau voltage, that is, the real-time cell voltage is compared with the comparison threshold of the cell plateau voltage to determine whether the real-time cell voltage is less than the comparison threshold of the cell plateau voltage. The comparison threshold can be any value between (A-0.02) and (A+0.02), and A is used to represent the maximum value of the cell plateau voltage. When the cell plateau voltage is 3.4V to 3.5V, the comparison threshold can be any value between 3.48 and 3.52, for example: 3.48V, 3.49V, 3.5V, 3.51V, 3.52V. This embodiment does not limit the specific value of the comparison threshold, and it can also be other values.

[0035] Step 103, in response to the real-time cell voltage of the new energy vehicle being greater than or equal to the cell plateau voltage, a feedback power instruction is generated according to the real-time cell voltage and a preset voltage threshold group, the feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction.

[0036] In this step, the preset voltage threshold group includes: a plurality of preset voltage thresholds, for example, one preset voltage threshold or a plurality of preset voltage thresholds. Each preset voltage threshold in the preset voltage threshold group is greater than the cell plateau voltage.

[0037] When the real-time battery cell voltage of the new energy vehicle is greater than or equal to the battery cell plateau voltage, a feedback power instruction is generated according to the real-time battery cell voltage and each preset voltage threshold in the preset voltage threshold group. The feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction.

[0038] When the real-time battery cell voltage exceeds the battery cell platform voltage, measures to reduce the feedback power are not taken immediately. Instead, the real-time battery cell voltage continues to be detected, and the real-time battery cell voltage is compared with each preset voltage threshold in the preset voltage threshold group that exceeds the battery cell platform voltage. Based on the comparison result, a feedback power instruction is generated to instruct the reduction of the feedback power. This not only realizes overcharge and overvoltage protection for the battery cell under energy feedback conditions, but also can greatly recover the feedback electric energy and improve the endurance of the entire vehicle.

[0039] When the preset voltage threshold includes a preset voltage threshold, the preset voltage threshold is referred to as the first preset voltage threshold. The first preset voltage threshold is less than the cell cut-off voltage. When applied, when the cell cut-off voltage is 3.65V, the first preset voltage threshold can be any value between 3.58V-3.62V, for example: 3.58V, 3.59V, 3.6V, 3.61V, 3.62V, and the first preset voltage threshold differs from the cell cut-off voltage by 0.05V.

[0040] When the real-time battery cell voltage of the new energy vehicle is greater than or equal to the battery cell plateau voltage, the real-time battery cell voltage is compared with the first preset voltage threshold. If the comparison result is that the real-time battery cell voltage is less than or equal to the first preset voltage threshold, a first feedback power instruction is generated, and the first feedback power instruction includes a first power threshold. The first feedback power instruction will be used to make the motor of the new energy vehicle reduce the feedback power to the first power threshold according to the first feedback power instruction. The first power threshold is less than 7kw, such as 3kw. This embodiment does not limit the specific value of the first power threshold, and it can also be other values. If the comparison result is that the real-time battery cell voltage is greater than the first preset voltage threshold, a second feedback power instruction is generated, and the second feedback instruction includes a second power threshold. The second feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power to the second power threshold according to the second feedback power instruction, and the second power threshold is 0. When applied, the first feedback power instruction or the second feedback instruction can be sent to the PDCU (Power Domain Controller, power domain controller / vehicle controller) through the BMS, and then the PDCU controls the motor according to the instruction.

[0041] The real-time cell voltage will change with the feedback power and time. In order to better realize the process of reducing the feedback power, the first feedback power instruction also includes: a first preset time, that is, the first feedback power instruction not only includes the first power threshold, but also includes the first preset time. At this time, the first feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power to the first power threshold within the first preset time according to the first feedback power instruction. The second feedback power instruction also includes: a second preset time, that is, the second feedback power instruction not only includes the second power threshold, but also includes the second preset time. At this time, the second feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power to the second power threshold within the second preset time according to the second feedback power instruction, and the second preset time is less than the first preset time. The first preset time can be any value between 3s and 7s, for example: 3s, 4s, 5s, 6s, 7s; the second preset time can be any value between 1s and 5s, for example: 1s, 2s, 3s, 4s, 5s.

[0042] In order to further recycle the feedback electric energy and improve the endurance of the whole vehicle, the preset voltage threshold group also includes: a second preset voltage threshold, the second preset voltage threshold is less than the first preset voltage threshold, at this time, the preset voltage threshold group includes two preset voltage thresholds, namely: a first preset voltage threshold and a second preset voltage threshold. When applied, when the cell cut-off voltage is 3.65V, the first preset voltage threshold can be any value between 3.58V-3.62V, and the second preset voltage threshold can be any data between 3.53V-3.57V, for example: 3.53V, 3.54V, 3.55V, 3.56V, 3.57V. Preferably, the second preset voltage threshold differs from the first preset voltage threshold by 0.5V.

[0043] Accordingly, in response to the real-time cell voltage of the new energy vehicle being greater than or equal to the cell plateau voltage, before determining whether the real-time cell voltage is greater than the first preset voltage threshold, the following steps are also included:

[0044] Determine whether the real-time battery cell voltage is greater than a second preset voltage threshold; in response to the real-time battery cell voltage not being greater than the second preset voltage threshold, generate a third feedback power instruction including a third power threshold; in response to the real-time battery cell voltage being greater than the second preset voltage threshold, jump and execute the step: determine whether the real-time battery cell voltage is greater than the first preset voltage threshold.

[0045] Specifically, if the real-time battery cell voltage is greater than the first preset voltage threshold, the real-time battery cell voltage is compared with the second preset voltage threshold. If the comparison result is that the real-time battery cell voltage is less than or equal to the second preset voltage threshold, a third feedback power instruction is generated. The third feedback power instruction includes a third single power threshold. The third feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power to the third power threshold according to the third feedback power instruction. The third power threshold is greater than the first power threshold and greater than the second power threshold. The third power threshold is less than or equal to 7kw, such as 5kw. This embodiment does not limit the specific value of the third power threshold, and it can also be other values. If the comparison result is that the real-time battery cell voltage is greater than the second preset voltage threshold, jump to the step of determining whether the real-time battery cell voltage is greater than the first preset voltage threshold.

[0046] In order to better realize the process of reducing the feedback power, the third feedback power instruction also includes: a third preset time, that is, the third feedback power instruction includes not only the third power threshold, but also the third preset time. At this time, the third feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power to the third power threshold within the third preset time according to the third feedback power instruction. The third preset time is greater than the first preset time and greater than the second preset time. The third preset time can be any value between 8s and 12s, for example: 8s, 9s, 10s, 11s, 12s.

[0047] Three voltage points are set, the first voltage point is the cell plateau voltage, the second voltage point is the second preset voltage threshold, and the third voltage point is the first voltage preset threshold. A feedback overcharge protection method is designed based on the three voltage points. This method enables the reduction of feedback power to be achieved: non-interrupted reduction, feedback power is allowed to exist, and the feedback power cannot be directly limited to 0, so as not to affect the vehicle's endurance. Specifically, when the first voltage point is exceeded but not the second voltage point, the power is reduced to 5kw within 10S. When the second voltage point is exceeded but not the third voltage point, the power is reduced to 3kw within 5S. When the third voltage point is exceeded, the power is reduced to 0kw within 3S.

[0048] The following are the settings for the three voltage points: 1. According to the characteristics of the battery cell, the voltage plateau period of the charge and charge voltage is between 3.4-3.5V, so the first voltage point can be selected as 3.5V. In the nearly fully charged state, the battery cell voltage can be charged from 3.5V to 3.65V (3.65V is the cut-off voltage) in just a few minutes. So the second voltage point can be selected as 3.55V. Considering that the internal resistance of the battery cell is large at low temperatures, a small current will also cause the voltage to rise to the cut-off voltage in a short time, so the third voltage point can be selected as 3.6V.

[0049] See also Figure 2 An embodiment of the present invention provides a feedback overcharge protection device for executing the feedback overcharge protection method provided in the above embodiment. The device includes: a feedback working condition judgment module 201, a cell plateau voltage judgment module 202 and a power command generation module 203.

[0050] Among them, the feedback condition judgment module 201 is used to judge whether the new energy vehicle enters the energy feedback condition. The battery cell plateau voltage judgment module 202 is used to respond to the new energy vehicle entering the energy feedback condition and judge whether the real-time battery cell voltage of the new energy vehicle is less than the battery cell plateau voltage. The power instruction generation module 203 is used to respond to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage, and generate a feedback power instruction according to the real-time battery cell voltage and the preset voltage threshold group. The feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction. The preset voltage threshold group includes at least one preset voltage threshold, and each preset voltage threshold in the preset voltage threshold group is greater than the battery cell plateau voltage.

[0051] Optionally, when the preset voltage threshold group includes: a first preset voltage threshold, the power instruction generation module 203 is used to: determine whether the real-time battery cell voltage is greater than the first preset voltage threshold; in response to the real-time battery cell voltage being not greater than the first preset voltage threshold, generate a first feedback power instruction including a first power threshold, the first feedback power instruction being used to enable the motor of the new energy vehicle to reduce the feedback power to the first power threshold according to the first feedback power instruction; in response to the real-time battery cell voltage being greater than the first preset voltage threshold, generate a second feedback power instruction including a second power threshold, the second feedback power instruction being used to enable the motor of the new energy vehicle to reduce the feedback power to the second power threshold according to the second feedback power instruction, and the second power threshold is 0.

[0052] Optionally, the first regenerative power instruction further includes a first preset time, and the first regenerative power instruction is used to enable the motor of the new energy vehicle to reduce the regenerative power to a first power threshold within the first preset time according to the first regenerative power instruction.

[0053] Optionally, the second feedback power instruction also includes a second preset time, and the second feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a second power threshold within a second preset time according to the second feedback power instruction, and the second preset time is less than the first preset time.

[0054] Optionally, the power command generation module 203 further includes in the preset voltage threshold group: a second preset voltage threshold, when the second preset voltage threshold is less than the first preset voltage threshold, in response to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage, before determining whether the real-time battery cell voltage is greater than the first preset voltage threshold, and is also used

[0055] Determine whether the real-time battery cell voltage is greater than a second preset voltage threshold; in response to the real-time battery cell voltage not being greater than the second preset voltage threshold, generate a third feedback power instruction including a third power threshold, the third feedback power instruction being used to enable the motor of the new energy vehicle to reduce the feedback power to a third power threshold according to the third feedback power instruction, the third power threshold being greater than the first power threshold and the second power threshold; in response to the real-time battery cell voltage being greater than the second preset voltage threshold, execute determination whether the real-time battery cell voltage is greater than the first preset voltage threshold.

[0056] Optionally, the third feedback power instruction also includes a third preset time, and the third feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a third power threshold within the third preset time according to the third feedback power instruction.

[0057] Optionally, the first preset voltage threshold is less than the cell cut-off voltage.

[0058] It should be noted that: the feedback overcharge protection device provided in the above embodiment only uses the division of the above functional modules as an example when performing feedback overcharge protection on the battery cell. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the feedback overcharge protection device provided in the above embodiment and the feedback overcharge protection method embodiment belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0059] An embodiment of the present invention provides an electronic device, which includes: a memory and a processor. The processor is connected to the memory and is configured to execute the above-mentioned feedback overcharge protection method based on the instructions stored in the memory. The number of processors can be one or more, and the processor can be single-core or multi-core. The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory, such as a read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip. The memory can be an example of the following computer-readable medium.

[0060] The embodiment of the present invention provides a computer-readable storage medium, on which at least one instruction, at least one program, code set or instruction set is stored, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the above-mentioned feedback overcharge protection method. Computer-readable storage media include: permanent and non-permanent, removable and non-removable media can implement information storage by any method or technology. The information can be a computer-readable instruction, a data structure, a module of a program or other data. Examples of computer storage media include, but are not limited to: phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, read-only compact disk-read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassette, disk storage or other magnetic storage device or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.

[0061] An embodiment of the present invention further provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any method described in the aforementioned feedback overcharge protection method embodiment.

[0062] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a device (which can be a personal computer, a server, or a network device, etc.) to execute the method steps described in each embodiment or some parts of the embodiment.

[0063] It is known from common technical knowledge that the present invention can be implemented by other embodiments that do not deviate from its spirit or essential features. Therefore, the above disclosed embodiments are only illustrative in all respects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are included in the present invention.

Claims

1. A feedback overcharge protection method, applied to new energy vehicles, characterized in that: The method comprises: Determining whether the new energy vehicle enters an energy feedback operating condition; In response to the new energy vehicle entering the energy feedback operating condition, determining whether the real-time cell voltage of the new energy vehicle is less than the cell plateau voltage; In response to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage, a feedback power instruction is generated according to the real-time battery cell voltage and a preset voltage threshold group, and the feedback power instruction is used to make the motor of the new energy vehicle reduce the feedback power according to the feedback power instruction. The preset voltage threshold group includes at least one preset voltage threshold, and each preset voltage threshold in the preset voltage threshold group is greater than the battery cell plateau voltage.

2. The method according to claim 1, characterized in that The preset voltage threshold group includes: a first preset voltage threshold; The generating of the feedback power instruction according to the real-time cell voltage and the preset voltage threshold group comprises: Determine whether the real-time cell voltage is greater than the first preset voltage threshold; In response to the real-time cell voltage being not greater than the first preset voltage threshold, generating a first regenerative power instruction including a first power threshold, wherein the first regenerative power instruction is used to cause the motor of the new energy vehicle to reduce the regenerative power to the first power threshold according to the first regenerative power instruction; In response to the real-time battery cell voltage being greater than the first preset voltage threshold, a second feedback power instruction including a second power threshold is generated, and the second feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a second power threshold according to the second feedback power instruction, and the second power threshold is 0.

3. The method according to claim 2, characterized in that The first feedback power instruction also includes a first preset time, and the first feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a first power threshold within the first preset time according to the first feedback power instruction.

4. The method according to claim 3, characterized in that The second feedback power instruction also includes a second preset time, and the second feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power to a second power threshold within the second preset time according to the second feedback power instruction, and the second preset time is less than the first preset time.

5. The method according to any one of claims 2 to 4, characterized in that: The preset voltage threshold group further includes: a second preset voltage threshold, the second preset voltage threshold being smaller than the first preset voltage threshold; In response to the real-time cell voltage of the new energy vehicle being greater than or equal to the cell plateau voltage, before determining whether the real-time cell voltage is greater than the first preset voltage threshold, the method further includes: Determine whether the real-time battery cell voltage is greater than the second preset voltage threshold; In response to the real-time cell voltage being not greater than the second preset voltage threshold, generating a third regenerative power instruction including a third power threshold, wherein the third regenerative power instruction is used to cause the motor of the new energy vehicle to reduce the regenerative power to the third power threshold according to the third regenerative power instruction, and the third power threshold is greater than the first power threshold and the second power threshold; In response to the real-time cell voltage being greater than the second preset voltage threshold, the process jumps to the step of determining whether the real-time cell voltage is greater than the first preset voltage threshold.

6. The method according to claim 5, characterized in that The third regenerative power instruction also includes a third preset time, and the third regenerative power instruction is used to enable the motor of the new energy vehicle to reduce the regenerative power to a third power threshold within the third preset time according to the third regenerative power instruction.

7. The method according to claim 2, characterized in that The first preset voltage threshold is less than the cell cut-off voltage.

8. A feedback overcharge protection device, applied to new energy vehicles, characterized in that: The device comprises: A feedback operating condition judgment module is used to judge whether the new energy vehicle enters an energy feedback operating condition; A cell plateau voltage judgment module, used for judging whether the real-time cell voltage of the new energy vehicle is less than the cell plateau voltage in response to the new energy vehicle entering the energy feedback working condition; A power instruction generation module is used to generate a feedback power instruction in response to the real-time battery cell voltage of the new energy vehicle being greater than or equal to the battery cell plateau voltage according to the real-time battery cell voltage and a preset voltage threshold group, wherein the feedback power instruction is used to enable the motor of the new energy vehicle to reduce the feedback power according to the feedback power instruction, and the preset voltage threshold group includes at least one preset voltage threshold, and each preset voltage threshold in the preset voltage threshold group is greater than the battery cell plateau voltage.

9. A computer program product comprising instructions, characterized in that When the computer program product is run on a computer, the method according to any one of claims 1 to 7 is executed by the computer.

10. A new energy vehicle, characterized in that: Including the feedback overcharge protection device as described in claim 8.

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