A method for reducing battery temperature difference, battery management system, medium and device

Abstract

The present invention provides a method for reducing battery temperature difference, a battery management system, a medium and a device, the method comprising: if it is determined that the lowest temperature of the battery is lower than a first temperature threshold, controlling the battery to enter a heating mode; when it is determined that the lowest temperature is greater than or equal to a second temperature threshold, adjusting the coolant inlet temperature according to the highest temperature and / or the lowest temperature of the battery; and adjusting the flow rate of the coolant based on a first target flow rate so that the flow rate of the coolant is consistent with the second target flow rate; in this way, when the battery is fast charged at low temperature, if it is determined that the lowest temperature of the battery is greater than or equal to the second temperature threshold, adjusting the coolant inlet temperature according to the highest temperature and / or the lowest temperature of the battery, so that the coolant inlet temperature can be kept between the highest temperature and the lowest temperature of the battery, and then after the coolant circulates for a period of time, the battery temperature difference can be gradually reduced, ensuring that the battery temperature difference is reduced to an acceptable range at the fastest speed, thereby improving the battery life.

Description

Technical Field

[0001] The present application relates to the field of vehicle charging technology, and in particular to a method for reducing battery temperature difference, a battery management system, a medium and a device. Background Art

[0002] Electric vehicle power batteries have an optimal operating temperature range. Beyond this temperature range, the battery performance will decrease to varying degrees. Therefore, in order to maximize the performance of the battery, the battery needs to be cooled when the temperature is high, and the battery needs to be heated when the temperature is low.

[0003] At present, OEMs pursue the fastest charging speed (fast charging mode) in low-temperature charging mode. For liquid-cooled batteries, they will pursue faster heating speed in low-temperature conditions, mainly to increase the temperature and flow of the battery coolant. When the coolant flow and temperature are increased, it will cause a large temperature difference in the battery after the low-temperature heating is stopped in the fast charging mode, which will affect the battery life. Summary of the invention

[0004] In response to the problems existing in the prior art, the embodiments of the present invention provide a method for reducing the temperature difference of the battery, a battery management system, a medium and a device, so as to solve or partially solve the technical problem in the prior art that after the battery exits the heating in the low-temperature fast charging mode, the battery temperature difference is large, which affects the battery life.

[0005] A first aspect of the present invention provides a method for reducing a battery temperature difference, the method comprising:

[0006] If it is determined that the lowest temperature of the battery is lower than the first temperature threshold, controlling the battery to enter a heating mode;

[0007] When it is determined that the minimum temperature is greater than or equal to a second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with the first target temperature;

[0008] The flow rate of the coolant is adjusted based on the first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate.

[0009] In the above solution, controlling the battery to enter a heating mode includes:

[0010] The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on a second target flow rate; the second target temperature is 48°C to 52°C, and the second target flow rate is 18L / min to 22L / min.

[0011] In the above solution, after adjusting the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate, the method further includes:

[0012] determining a temperature difference between a maximum temperature and a minimum temperature of the battery;

[0013] If it is determined that the temperature difference is less than or equal to a preset temperature difference threshold, the cooling liquid is controlled to turn off heating.

[0014] In the above solution, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery includes:

[0015] Determine a temperature average of the maximum temperature and the minimum temperature;

[0016] If the battery mode is a non-energy-saving mode, the temperature average is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

[0017] In the above solution, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery includes:

[0018] If the battery mode is the energy-saving mode, the highest temperature is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

[0019] In the above scheme, the first target flow rate is 10L / min to 14L / min.

[0020] A second aspect of the present invention provides a battery management system, the battery management system comprising:

[0021] a control unit, configured to control the battery to enter a heating mode if it is determined that the lowest temperature of the battery is lower than a first temperature threshold;

[0022] The regulating unit is used for regulating the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with the first target temperature when it is determined that the minimum temperature is greater than or equal to a second temperature threshold; and regulating the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the second target flow rate.

[0023] In the above solution, the control unit is specifically used for:

[0024] The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on a second target flow rate; the second target temperature is 48°C to 52°C, and the second target flow rate is 18L / min to 22L / min.

[0025] According to a third aspect of the present invention, a computer-readable storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the steps of any one of the methods described in the first aspect are implemented.

[0026] According to a fourth aspect of the present invention, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, the steps of any one of the methods described in the first aspect are implemented.

[0027] The present invention provides a method for reducing battery temperature difference, a battery management system, a medium and a device, the method comprising: if it is determined that the minimum temperature of the battery is lower than a first temperature threshold, controlling the battery to enter a heating mode; when it is determined that the minimum temperature is greater than or equal to a second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery, so that the coolant inlet temperature is consistent with a first target temperature; and adjusting the flow rate of the coolant based on the first target flow rate, so that the flow rate of the coolant is consistent with the second target flow rate; in this way, when the battery is fast charged at low temperature, if it is determined that the minimum temperature of the battery is greater than or equal to the second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery, so that the coolant inlet temperature can be kept between the maximum temperature and the minimum temperature of the battery, and then after the coolant circulates for a period of time, the battery temperature difference can be gradually reduced, ensuring that the battery temperature difference is reduced to an acceptable range at the fastest speed, thereby improving the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limitations of the present invention. In addition, the same reference symbols are used to represent the same components throughout the accompanying drawings.

[0029] In the attached picture:

[0030] Figure 1 A schematic diagram of a method for reducing battery temperature difference according to an embodiment of the present invention is shown;

[0031] Figure 2 A schematic diagram of another method for reducing battery temperature difference provided in accordance with an embodiment of the present invention is shown;

[0032] Figure 3A schematic diagram of the overall structure of a battery management system provided according to an embodiment of the present invention is shown;

[0033] Figure 4 A schematic diagram of the overall structure of an electronic device provided according to an embodiment of the present invention is shown;

[0034] Figure 5 A schematic diagram of the structure of a computer-readable storage medium provided according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0035] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0036] The embodiment of the present invention provides a method for reducing the temperature difference of a battery, such as Figure 1 and Figure 2 As shown, the method comprises the following steps:

[0037] S110, if it is determined that the lowest temperature of the battery is lower than the first temperature threshold, controlling the battery to enter a heating mode;

[0038] The lowest temperature of the battery is obtained, and it is determined whether the lowest temperature is lower than or equal to a first temperature threshold. If it is determined that the lowest temperature is lower than or equal to the first temperature threshold, the battery is controlled to enter a heating mode to increase the battery temperature. The first temperature threshold may be 3 to 6°C, preferably 5°C.

[0039] In one embodiment, controlling the battery to enter a heating mode includes:

[0040] The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on the second target flow rate; the second target temperature is 48 to 52°C, preferably 50°C; the second target flow rate is 18 to 22 L / min, preferably 20 L / min.

[0041] It should be noted that heating the coolant and regulating the speed of the coolant can be performed simultaneously.

[0042] S111, when it is determined that the minimum temperature is greater than or equal to a second temperature threshold, the coolant inlet temperature is adjusted according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with a first target temperature; and the flow rate of the coolant is adjusted based on a first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate.

[0043] After heating, the minimum temperature of the battery is obtained again to determine whether the minimum temperature of the battery is greater than or equal to the second temperature threshold. When it is determined that the minimum temperature is greater than or equal to the second temperature threshold, the coolant inlet temperature is adjusted according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with the first target temperature; and the flow rate of the coolant is adjusted based on the first target flow rate so that the flow rate of the coolant is consistent with the second target flow rate.

[0044] Specifically, when it is determined that the lowest temperature is greater than or equal to the second temperature threshold, the battery enters the heat-averaging mode, in which the coolant inlet temperature needs to be adjusted to the first target temperature and the coolant flow rate needs to be adjusted to the first target flow rate, wherein the first target flow rate is 10 to 14 L / min, preferably 12 L / min.

[0045] In this embodiment, the battery temperature difference is considered mainly due to the difference in the corresponding heat dissipation capacity when the battery is at the highest temperature and when the battery is at the lowest temperature. Therefore, in order to reduce the battery temperature difference to within the qualified temperature difference range as soon as possible, it is necessary to reasonably set the target temperature (first target temperature) of the coolant inlet temperature, and then when the battery is at a low temperature, the coolant can be used to quickly heat the battery; when the battery is at a high temperature, the coolant can be used to quickly cool the battery.

[0046] Then in one embodiment, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery includes:

[0047] Determine the temperature mean of the maximum temperature and the minimum temperature;

[0048] If the battery mode is a non-energy-saving mode, the temperature average is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

[0049] In addition, if it is necessary to further save energy on the basis of rapidly reducing the temperature difference, in one embodiment, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery includes:

[0050] If the battery mode is the energy-saving mode, the highest temperature is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

[0051] In this embodiment, when the maximum temperature of the battery is used as the first target temperature of the coolant, if the battery is in a high temperature state, the high temperature battery will not be heated or cooled; if the battery is in a low temperature state, the low temperature battery cell will be heated, which can also reduce the temperature difference to a certain extent and save energy at the same time.

[0052] In one embodiment, after adjusting the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate, the method further includes:

[0053] Determine the temperature difference between the maximum temperature and the minimum temperature of the battery;

[0054] If it is determined that the temperature difference is less than or equal to the preset temperature difference threshold, the coolant is controlled to turn off heating.

[0055] For example, when it is determined that the temperature difference is less than or equal to 5°C, it means that the battery temperature difference has dropped to a reasonable range and the coolant heating will be turned off.

[0056] Based on the same inventive concept as the above-mentioned embodiment, this embodiment also provides a battery management system BMS, such as Figure 3 As shown, the system includes:

[0057] The control unit 31 is configured to control the battery to enter a heating mode if it is determined that the lowest temperature of the battery is lower than a first temperature threshold;

[0058] The regulating unit 32 is used for regulating the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with the first target temperature when it is determined that the minimum temperature is greater than or equal to the second temperature threshold; and regulating the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the second target flow rate.

[0059] In one implementation, the control unit 31 is specifically configured to:

[0060] The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on the second target flow rate; the second target temperature is 48 to 52°C, preferably 50°C; the second target flow rate is 18 to 22 L / min, preferably 20 L / min.

[0061] Since the battery management system introduced in the embodiment of the present invention is a system used to implement the method for reducing the battery temperature difference in the embodiment of the present invention, based on the method introduced in the embodiment of the present invention, the person skilled in the art can understand the specific structure and deformation of the system, so it is not repeated here. All systems used in the method of the embodiment of the present invention belong to the scope of protection of the present invention.

[0062] Based on the same inventive concept, this embodiment provides an electronic device 400, such as Figure 4 As shown, it includes a memory 410, a processor 420, and a computer program 411 stored in the memory 410 and executable on the processor 420. When the processor 420 executes the computer program 411, any step of the method described above is implemented.

[0063] Based on the same inventive concept, this embodiment provides a computer-readable storage medium 500, such as Figure 5 As shown, a computer program 511 is stored thereon, and when the computer program 511 is executed by a processor, the steps of any of the methods described above are implemented.

[0064] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0065] The present invention provides a method for reducing battery temperature difference, a battery management system, a medium and a device, the method comprising: if it is determined that the minimum temperature of the battery is lower than a first temperature threshold, controlling the battery to enter a heating mode; when it is determined that the minimum temperature is greater than or equal to a second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery, so that the coolant inlet temperature is consistent with a first target temperature; and adjusting the flow rate of the coolant based on the first target flow rate, so that the flow rate of the coolant is consistent with the second target flow rate; in this way, when the battery is fast charged at low temperature, if it is determined that the minimum temperature of the battery is greater than or equal to the second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery, so that the coolant inlet temperature can be kept between the maximum temperature and the minimum temperature of the battery, and then after the coolant circulates for a period of time, the battery temperature difference can be gradually reduced, ensuring that the battery temperature difference is reduced to an acceptable range at the fastest speed, thereby improving the battery life.

[0066] The algorithm and display provided herein are not inherently related to any particular computer, virtual system or other device. Various general purpose systems can also be used together with the teachings based on this. According to the above description, it is obvious that the structure required for constructing such systems. In addition, the present invention is not directed to any specific programming language either. It should be understood that various programming languages ​​can be utilized to realize the content of the present invention described herein, and the description of the above specific languages ​​is for disclosing the best mode of the present invention.

[0067] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0068] Similarly, it should be understood that in order to streamline the present disclosure and aid in understanding one or more of the various inventive aspects, in the above description of exemplary embodiments of the present invention, various features of the present invention are sometimes grouped together into a single embodiment, figure, or description thereof. However, this disclosed method should not be interpreted as reflecting the intention that the claimed invention requires more features than those explicitly recited in each claim. More specifically, as reflected in the claims below, inventive aspects lie in less than all the features of the individual embodiments disclosed above. Therefore, the claims that follow the specific embodiment are hereby expressly incorporated into the specific embodiment, with each claim itself serving as a separate embodiment of the present invention.

[0069] Those skilled in the art will appreciate that the modules in the devices in the embodiments may be adaptively changed and arranged in one or more devices different from the embodiments. The modules or units or components in the embodiments may be combined into one module or unit or component, and in addition they may be divided into a plurality of submodules or subunits or subcomponents. Except that at least some of such features and / or processes or units are mutually exclusive, all features disclosed in this specification (including the accompanying claims, abstracts and drawings) and all processes or units of any method or device disclosed in this manner may be combined in any combination. Unless otherwise expressly stated, each feature disclosed in this specification (including the accompanying claims, abstracts and drawings) may be replaced by an alternative feature providing the same, equivalent or similar purpose.

[0070] In addition, those skilled in the art will appreciate that, although some embodiments herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present invention and form different embodiments. For example, in the claims below, any one of the claimed embodiments may be used in any combination.

[0071] The various component embodiments of the present invention can be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It should be understood by those skilled in the art that a microprocessor or digital signal processor (DSP) can be used in practice to implement some or all functions of some or all components in a gateway, proxy server, or system according to an embodiment of the present invention. The present invention can also be implemented as a device or apparatus program (e.g., a computer program and a computer program product) for executing part or all of the methods described herein. Such a program implementing the present invention can be stored on a computer-readable medium, or can have the form of one or more signals. Such a signal can be downloaded from an Internet website, or provided on a carrier signal, or provided in any other form.

[0072] It should be noted that the above embodiments illustrate the present invention rather than limit it, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets shall not be construed as a limitation on the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "one" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present invention may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of devices, several of these devices may be embodied by the same hardware item. The use of the words first, second, and third, etc., does not indicate any order. These words may be interpreted as names.

[0073] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for reducing battery temperature difference, characterized in that: The method comprises: If it is determined that the lowest temperature of the battery is lower than the first temperature threshold, controlling the battery to enter a heating mode; When it is determined that the minimum temperature is greater than or equal to a second temperature threshold, adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery so that the coolant inlet temperature is consistent with the first target temperature; and adjusting the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate; wherein, The step of adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery comprises: Determine a temperature average of the maximum temperature and the minimum temperature; If the battery mode is a non-energy-saving mode, the temperature average is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

2. The method according to claim 1, characterized in that The controlling the battery to enter a heating mode comprises: The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on a second target flow rate; the second target temperature is 48°C to 52°C, and the second target flow rate is 18L / min to 22L / min.

3. The method according to claim 1, characterized in that After adjusting the flow rate of the coolant based on the first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate, the method further includes: determining a temperature difference between a maximum temperature and a minimum temperature of the battery; If it is determined that the temperature difference is less than or equal to a preset temperature difference threshold, the coolant is controlled to turn off heating.

4. The method according to claim 1, characterized in that The step of adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery comprises: If the battery mode is the energy-saving mode, the highest temperature is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

5. The method according to claim 1, characterized in that The first target flow rate is 10 L / min to 14 L / min.

6. A battery management system, characterized in that: The battery management system comprises: a control unit, configured to control the battery to enter a heating mode if it is determined that the lowest temperature of the battery is lower than a first temperature threshold; an adjusting unit, configured to, when determining that the minimum temperature is greater than or equal to a second temperature threshold, adjust a coolant inlet temperature according to a maximum temperature and / or a minimum temperature of the battery so that the coolant inlet temperature is consistent with a first target temperature; and adjust a flow rate of the coolant based on a first target flow rate so that the flow rate of the coolant is consistent with the first target flow rate; The step of adjusting the coolant inlet temperature according to the maximum temperature and / or the minimum temperature of the battery comprises: Determine a temperature average of the maximum temperature and the minimum temperature; If the battery mode is a non-energy-saving mode, the temperature average is used as the first target temperature, and the coolant inlet temperature is adjusted based on the first target temperature so that the coolant inlet temperature is consistent with the first target temperature.

7. The battery management system according to claim 6, characterized in that: The control unit is specifically used for: The coolant is heated until the coolant temperature reaches a second target temperature; and the flow rate of the coolant is adjusted based on a second target flow rate; the second target temperature is 48°C to 52°C, and the second target flow rate is 18L / min to 22L / min.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the method according to any one of claims 1 to 5 are implemented.

9. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the method according to any one of claims 1 to 5 are implemented.

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