Method and device for controlling battery status of electric vehicle

Abstract

The present invention discloses a method and device for controlling the battery state of an electric vehicle, comprising obtaining initial state parameters and real-time state parameters of a battery to be tested; calculating a model correction amount of the battery to be tested; sending an update request for the electrochemical model of the battery to be tested to a vehicle server according to the size of the model correction amount; receiving options for different battery discharge modes sent by the vehicle server in response to the update request; and updating the electrochemical parameters of the electrochemical model of the battery to be tested on the vehicle side in real time based on the result selected by the user from the options. The method and device for controlling the battery state of an electric vehicle provided by an embodiment of the present invention uses the electrochemical model of the battery as a control medium. On the one hand, it comprehensively monitors the real-time state of the battery and sends an update request for the electrochemical model of the battery when necessary. On the other hand, the user independently selects the discharge mode of the battery to achieve the battery state update, thereby meeting the driving performance requirements of the vehicle and promoting the intelligentization process of the vehicle.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a method and device for controlling the battery state of an electric vehicle. Background Art

[0002] With the continuous development of new energy technologies, electric vehicles have gradually gained market recognition and consumer favor due to their many advantages such as fast start-up, zero emissions, low noise and low energy consumption.

[0003] When an electric vehicle is in operation, the performance of its power battery (lithium battery) determines the vehicle's driving performance. However, as the vehicle's mileage increases, the performance of the power battery changes to varying degrees, and these changes are often unpredictable and directly affect the vehicle's driving performance. Furthermore, during driving, users need to adjust the power battery's performance due to varying mileage, time, or road sections. However, existing technologies provide a low level of interaction between users and batteries. Therefore, how to accurately control the battery status of electric vehicles has become a technical problem that needs to be urgently addressed by those skilled in the art. Summary of the Invention

[0004] The present invention provides a method and device for controlling the battery status of an electric vehicle, which uses the battery's electrochemical model as a control medium. On the one hand, the method comprehensively monitors the real-time status of the battery and sends an update request for the battery's electrochemical model to the vehicle server when necessary. On the other hand, the user can independently select the battery discharge mode according to actual needs, and then update the battery status by updating the electrochemical parameters, thereby meeting the vehicle's driving performance requirements and promoting the vehicle's intelligent process.

[0005] In order to solve the above technical problems, an embodiment of the present invention provides a method for controlling the battery status of an electric vehicle, comprising:

[0006] When the vehicle is running, the initial state parameters and real-time state parameters of the battery to be tested are obtained;

[0007] Calculating a model correction amount of the battery to be tested based on the initial state parameters and the real-time state parameters;

[0008] Sending an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount;

[0009] receiving options of different battery discharge modes sent by the vehicle server in response to the update request;

[0010] Based on the result selected by the user from the options, the electrochemical parameters of the electrochemical model of the battery to be tested on the vehicle side are updated in real time.

[0011] As one preferred solution, the model correction amount includes an internal resistance change amount and an SOC change amount;

[0012] The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes:

[0013] If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or,

[0014] If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

[0015] As one preferred solution, the battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option.

[0016] As one preferred solution, based on the result selected by the user from the options, the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested are updated in real time, specifically including:

[0017] If the result selected by the user is the standard discharge mode option, receiving a first download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time;

[0018] If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

[0019] As one preferred solution, downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address specifically includes:

[0020] Obtaining a first download rate of the standard discharge mode option at the first download address;

[0021] When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option;

[0022] The downloading of the vehicle-side electrochemical parameters corresponding to the fast discharge mode option according to the second download address specifically includes:

[0023] Obtaining a second download rate of the fast discharge mode option at the second download address;

[0024] When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

[0025] Another embodiment of the present invention provides a device for controlling the battery status of an electric vehicle, comprising:

[0026] A parameter acquisition module is used to obtain the initial state parameters and real-time state parameters of the battery to be tested when the vehicle is running;

[0027] A model correction module, configured to calculate a model correction value of the battery to be tested based on the initial state parameters and the real-time state parameters;

[0028] An update request module, configured to send an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount;

[0029] an option module, configured to receive options of different battery discharge modes sent by the vehicle server in response to the update request;

[0030] The updating module is used to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time based on the result selected by the user from the options.

[0031] As one preferred solution, the model correction amount includes an internal resistance change amount and an SOC change amount;

[0032] The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes:

[0033] If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or,

[0034] If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

[0035] As one preferred solution, the battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option.

[0036] As one preferred solution, based on the result selected by the user from the options, the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested are updated in real time, specifically including:

[0037] If the result selected by the user is the standard discharge mode option, receiving a first download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time;

[0038] If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

[0039] As one preferred solution, downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address specifically includes:

[0040] Obtaining a first download rate of the standard discharge mode option at the first download address;

[0041] When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option;

[0042] The downloading of the vehicle-side electrochemical parameters corresponding to the fast discharge mode option according to the second download address specifically includes:

[0043] Obtaining a second download rate of the fast discharge mode option at the second download address;

[0044] When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

[0045] Compared with the prior art, the embodiments of the present invention have the following advantages:

[0046] (1) Considering that the state adjustment of power batteries is a very complex process, and the electrochemical model simplifies the lithium battery into a system consisting of a positive electrode, a negative electrode, a diaphragm and an electrolyte, accurately describes the chemical reactions occurring inside the battery pack, and can well reflect the state of the battery, the present invention uses the electrochemical model of the battery as a control medium, and calculates the internal resistance change and SOC change that can represent the change in battery state by real-time monitoring of the initial state parameters and real-time state parameters of the battery, thereby providing accurate theoretical support for the subsequent update of the electrochemical model parameters;

[0047] (2) If the battery status of the vehicle is damaged and needs to be updated, the vehicle server will provide the corresponding electrochemical parameters to ensure that the battery status of the updated vehicle is consistent with the preset and meets the vehicle's driving performance requirements. On the other hand, the user can select the corresponding battery discharge mode option based on the actual road section, journey or time. The vehicle will download the corresponding electrochemical parameters based on the selection result to ensure that the battery status of the vehicle meets the user's needs, thereby improving the degree of interaction between the user and the battery and promoting the intelligentization of the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 1 is a flow chart of a method for controlling the battery status of an electric vehicle in one embodiment of the present invention;

[0049] Figure 2 It is a structural schematic diagram of a control device for the battery status of an electric vehicle in one embodiment of the present invention;

[0050] Reference numerals:

[0051] Among them, 11, parameter acquisition module; 12, model correction module; 13, update request module; 14, option module; 15, update module. DETAILED DESCRIPTION

[0052] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. The purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0053] In the description of this application, the terms "first," "second," "third," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first," "second," "third," etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0054] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two components. The terms "vertical", "horizontal", "left", "right", "up", "down" and similar expressions used herein are for illustrative purposes only, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] In the description of this application, it should be noted that, unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by those skilled in the art. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood by those skilled in the art in specific circumstances.

[0056] An embodiment of the present invention provides a method for controlling the battery status of an electric vehicle. For details, see Figure 1 , Figure 1 The figure shows a flow chart of a method for controlling the battery state of an electric vehicle in one embodiment of the present invention, which includes steps S1 to S5, as follows:

[0057] S1. While the vehicle is running, obtain the initial state parameters and real-time state parameters of the battery to be tested;

[0058] S2. Calculating a model correction value of the battery to be tested based on the initial state parameters and the real-time state parameters;

[0059] S3. Sending an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount;

[0060] S4. receiving options of different battery discharge modes sent by the vehicle server according to the update request;

[0061] S5. Based on the result selected by the user from the options, the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested are updated in real time.

[0062] It should be noted that in the embodiments of the present invention, changes in battery state are characterized by the battery's electrochemical model. This model can accurately reflect the battery's state and is well-researched in prior art lithium battery research and will not be further elaborated upon here. Furthermore, the equivalence of the battery electrochemical model can be performed by a corresponding processor on the vehicle side, such as the vehicle-side VDCM domain controller or BCM domain controller, and is not specifically limited in this embodiment.

[0063] As for the vehicle server, it is located in the cloud and stores the electrochemical model parameters corresponding to different types of lithium batteries in different states. In addition, considering that the discharge modes of lithium batteries are diverse, the embodiment of the present invention increases the degree of user intervention. The user selects the discharge mode of the battery. The vehicle side will download the corresponding electrochemical parameters from the server based on the user's selection result to update the electrochemical model of the vehicle side, ensuring that the battery status of the vehicle side meets the user's needs, thereby improving the degree of interaction between the user and the battery and promoting the intelligent process of the vehicle.

[0064] Furthermore, in the above embodiment, the model correction amount includes the internal resistance change amount and the SOC change amount;

[0065] The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes:

[0066] If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or,

[0067] If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

[0068] The present invention uses internal resistance change and SOC change as indicators to assess battery status. Generally speaking, battery internal resistance changes to varying degrees as vehicle mileage increases. For example, a high internal resistance can cause the battery to heat up. Excessive temperature can reduce the battery's discharge operating voltage and shorten the discharge time, severely impacting battery performance and lifespan, and even posing a risk of spontaneous combustion. Furthermore, as a critical parameter for lithium batteries, accurately estimating SOC (State of Charge) can help maximize the power and safety of new energy vehicles and extend the lifespan of lithium batteries.

[0069] Calculating the internal resistance change and SOC change based on the initial state parameters and the real-time state parameters involves the calculation of the equivalent coulomb efficiency, the ratio of the battery discharge capacity to the charging capacity, the ambient temperature of the initial discharge of the battery, etc., which have been mentioned in the research on lithium battery performance in the prior art and will not be repeated in the embodiments of the present invention.

[0070] Furthermore, in the above embodiment, the battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option. The standard discharge mode refers to discharging at a constant current of 0.2C5 until the battery terminal voltage is 2.75V, and is suitable for sections of road that generally do not require constant speed or other requirements; the fast discharge mode refers to a short-term high-current discharge mode at room temperature with a current of 1C5 for more than 54 minutes, a discharge time of more than 30 minutes for 1.5C5, and a discharge time of more than 23 minutes for 2C5. It is suitable for time-sensitive scenarios or expressway sections of highways.

[0071] For the two discharge mode options described above, the user will select one based on their actual needs. If the user selects the standard discharge mode option, the user receives a first download address for vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; the vehicle-side electrochemical parameters corresponding to the standard discharge mode option are downloaded according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time;

[0072] If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

[0073] Of course, considering that the battery electrochemical model in this embodiment is updated during the real-time driving process of the vehicle, in order to meet the real-time requirements, the battery status update is required to be completed in a shorter time, so as to facilitate the vehicle to quickly adjust the driving status and meet user needs.

[0074] When the electrochemical model of the battery is updated, the electrochemical parameters are mainly downloaded. For the standard discharge mode, the download adjustment process specifically includes the following:

[0075] Obtaining a first download rate of the standard discharge mode option at the first download address;

[0076] When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option;

[0077] The rapid discharge mode specifically includes the following discharge adjustment process:

[0078] Obtaining a second download rate of the fast discharge mode option at the second download address;

[0079] When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

[0080] It can be seen that by adjusting different download addresses when downloading abnormalities, the download rate of electrochemical parameters is ensured to be in a high-speed state, so that the electrochemical model of the vehicle-side battery can be quickly updated. The updated battery status meets user needs, and the vehicle's driving status is adjusted more quickly, improving the user's car experience.

[0081] For details, see Figure 2 , Figure 2 FIG. 1 is a schematic diagram showing a structure of a control device for the battery status of an electric vehicle in one embodiment of the present invention, which includes:

[0082] The parameter acquisition module 11 is used to obtain the initial state parameters and real-time state parameters of the battery to be tested when the vehicle is running;

[0083] A model correction module 12 is used to calculate a model correction value of the battery to be tested based on the initial state parameters and the real-time state parameters;

[0084] An update request module 13 is configured to send an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount;

[0085] an option module 14, configured to receive options of different battery discharge modes sent by the vehicle server according to the update request;

[0086] The updating module 15 is configured to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time based on the result selected by the user from the options.

[0087] Furthermore, in the above embodiment, the model correction amount includes the internal resistance change amount and the SOC change amount;

[0088] The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes:

[0089] If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or,

[0090] If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

[0091] Furthermore, in the above embodiment, the battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option.

[0092] Furthermore, in the above embodiment, the real-time updating of the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested based on the result selected by the user from the options specifically includes:

[0093] If the result selected by the user is the standard discharge mode option, receiving a first download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time;

[0094] If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

[0095] Furthermore, in the above embodiment, downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address specifically includes:

[0096] Obtaining a first download rate of the standard discharge mode option at the first download address;

[0097] When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option;

[0098] The downloading of the vehicle-side electrochemical parameters corresponding to the fast discharge mode option according to the second download address specifically includes:

[0099] Obtaining a second download rate of the fast discharge mode option at the second download address;

[0100] When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

[0101] The method and device for controlling the battery status of an electric vehicle provided by the embodiments of the present invention have the following beneficial effects:

[0102] (1) Considering that the state adjustment of power batteries is a very complex process, and the electrochemical model simplifies the lithium battery into a system consisting of a positive electrode, a negative electrode, a diaphragm and an electrolyte, accurately describes the chemical reactions occurring inside the battery pack, and can well reflect the state of the battery, the present invention uses the electrochemical model of the battery as a control medium, and calculates the internal resistance change and SOC change that can represent the change in battery state by real-time monitoring of the initial state parameters and real-time state parameters of the battery, thereby providing accurate theoretical support for the subsequent update of the electrochemical model parameters;

[0103] (2) If the battery status of the vehicle is damaged and needs to be updated, the vehicle server will provide the corresponding electrochemical parameters to ensure that the battery status of the updated vehicle is consistent with the preset and meets the vehicle's driving performance requirements. On the other hand, the user can select the corresponding battery discharge mode option based on the actual road section, journey or time. The vehicle will download the corresponding electrochemical parameters based on the selection result to ensure that the battery status of the vehicle meets the user's needs, thereby improving the degree of interaction between the user and the battery and promoting the intelligentization of the vehicle.

[0104] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A method for controlling the battery status of an electric vehicle, characterized in that: include: When the vehicle is running, the initial state parameters and real-time state parameters of the battery to be tested are obtained; Calculating a model correction amount of the battery to be tested based on the initial state parameters and the real-time state parameters; Sending an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount; receiving options of different battery discharge modes sent by the vehicle server in response to the update request; Based on the result selected by the user from the options, the electrochemical parameters of the electrochemical model of the battery to be tested on the vehicle side are updated in real time.

2. The method for controlling the battery status of an electric vehicle according to claim 1, wherein: The model correction amount includes the internal resistance change amount and the SOC change amount; The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes: If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or, If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

3. The method for controlling the battery status of an electric vehicle according to claim 1, wherein: The battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option.

4. The method for controlling the battery status of an electric vehicle according to claim 3, wherein: The real-time updating of the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested based on the result selected by the user from the options specifically includes: If the result selected by the user is the standard discharge mode option, receiving a first download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time; If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

5. The method for controlling the battery status of an electric vehicle according to claim 4, wherein: The downloading of the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address specifically includes: Obtaining a first download rate of the standard discharge mode option at the first download address; When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option; The downloading of the vehicle-side electrochemical parameters corresponding to the fast discharge mode option according to the second download address specifically includes: Obtaining a second download rate of the fast discharge mode option at the second download address; When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

6. A control device for the battery status of an electric vehicle, characterized in that: include: A parameter acquisition module is used to obtain the initial state parameters and real-time state parameters of the battery to be tested when the vehicle is running; A model correction module, configured to calculate a model correction value of the battery to be tested based on the initial state parameters and the real-time state parameters; An update request module, configured to send an update request for the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount; an option module, configured to receive options of different battery discharge modes sent by the vehicle server in response to the update request; The updating module is used to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time based on the result selected by the user from the options.

7. The control device for the battery state of an electric vehicle according to claim 6, characterized in that: The model correction amount includes the internal resistance change amount and the SOC change amount; The step of sending a request for updating the electrochemical model of the battery to be tested to the vehicle server according to the size of the model correction amount specifically includes: If the internal resistance change is greater than a preset first threshold, sending a request for updating the electrochemical model of the battery to be tested to the vehicle server; or, If the SOC change is greater than a preset second threshold, a request for updating the electrochemical model of the battery to be tested is sent to the vehicle server.

8. The control device for the battery status of an electric vehicle according to claim 6, characterized in that: The battery discharge mode options include at least a standard discharge mode option and a fast discharge mode option.

9. The control device for the battery state of an electric vehicle according to claim 8, characterized in that: The real-time updating of the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested based on the result selected by the user from the options specifically includes: If the result selected by the user is the standard discharge mode option, receiving a first download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the standard discharge mode option; downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address, so as to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time; If the result selected by the user is the fast discharge mode option, the second download address of the vehicle-side electrochemical parameters sent by the vehicle server according to the fast discharge mode option is received; the vehicle-side electrochemical parameters corresponding to the fast discharge mode option are downloaded according to the second download address to update the electrochemical parameters of the electrochemical model of the vehicle-side battery to be tested in real time.

10. The control device for the battery state of an electric vehicle according to claim 9, characterized in that: The downloading of the vehicle-side electrochemical parameters corresponding to the standard discharge mode option according to the first download address specifically includes: Obtaining a first download rate of the standard discharge mode option at the first download address; When the first download rate is abnormal, changing the first download address to continue downloading the vehicle-side electrochemical parameters corresponding to the standard discharge mode option; The downloading of the vehicle-side electrochemical parameters corresponding to the fast discharge mode option according to the second download address specifically includes: Obtaining a second download rate of the fast discharge mode option at the second download address; When the second download rate is abnormal, the second download address is changed to continue downloading the vehicle-side electrochemical parameters corresponding to the fast discharge mode option.

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