Battery thermal management method, battery management system and vehicle for extended-range electric vehicle

Abstract

The present invention provides a battery thermal management method, a battery management system and a vehicle of an extended-range electric vehicle, comprising: when the driving mode is the extended-range mode, if it is determined that the first minimum temperature of the battery is lower than the first thermal management start-up temperature, the battery thermal management strategy is controlled to be turned on until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and the heating is stopped; when it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, the first target inlet temperature of the battery heating circuit is adjusted; in this way, the temperature range corresponding to the thermal management in the extended-range mode is wider than the temperature range in the pure electric mode, and the engine waste heat can be fully utilized for the heating cycle without consuming additional energy consumption of the battery itself, thereby improving the power characteristics of the vehicle; after the battery thermal management strategy is turned off, the first target inlet temperature is between the first highest temperature and the first lowest temperature, and the battery temperature difference gradually decreases, thereby improving the battery life.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery thermal management method, a battery management system and a vehicle for an extended-range electric vehicle. Background Art

[0002] Range Extended Electric Vehicle (REV) requires the placement of both the engine and the power battery, so compared to pure electric vehicles (BEV), the space occupied by the power battery of REV and the amount of power that can be used are relatively small. Therefore, it is particularly important to increase the range of REV in pure electric mode and reduce the energy consumption of REV in low temperature environments.

[0003] Generally speaking, engineers will adopt certain battery thermal management strategies to balance battery thermal management energy consumption and driving power requirements. However, the current thermal management strategies will cause waste of engine heat in REV extended-range mode, resulting in loss of discharge power and recharging power, which in turn causes the problem of reduced vehicle power characteristics. Summary of the invention

[0004] In response to the problems existing in the prior art, the embodiments of the present invention provide a battery thermal management method, a battery management system and a vehicle for an extended-range electric vehicle, so as to solve or partially solve the technical problems in the prior art that the current thermal management strategy causes waste heat of the extended-range electric vehicle, resulting in loss of discharge power and recharging power, and further causing a reduction in the vehicle's dynamic characteristics.

[0005] A first aspect of the present invention provides a battery thermal management method for an extended-range electric vehicle, the method comprising:

[0006] When it is determined that the driving mode of the vehicle is the extended-range mode, obtaining a first minimum temperature of the battery;

[0007] If it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, the battery thermal management strategy is controlled to be turned on, so that the vehicle controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and the heating of the antifreeze in the battery heating circuit is stopped;

[0008] The first current actual temperature of the battery is obtained. If it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, a first reference temperature is determined according to the first maximum temperature of the battery and the first minimum temperature of the battery; and the first reference temperature is sent to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein,

[0009] The first thermal management start-up temperature is lower than the second thermal management start-up temperature, and the first thermal management shutdown temperature is higher than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the pure electric mode when the driving mode is the driving mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the pure electric mode when the driving mode is the driving mode.

[0010] In the above scheme, the method further comprises:

[0011] When it is determined that the driving mode of the vehicle is the pure electric mode, obtaining the second lowest temperature of the battery;

[0012] If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

[0013] In the above scheme, the method further comprises:

[0014] When the driving mode is the pure electric mode, when it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, a second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature.

[0015] In the above solution, determining the first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery includes:

[0016] A first temperature average of the first maximum temperature and the first minimum temperature is obtained; the first temperature average is the reference temperature.

[0017] In the above solution, determining the second reference temperature according to the second highest temperature of the battery and the second lowest temperature of the battery includes:

[0018] A second temperature average of the second maximum temperature and the second minimum temperature is obtained; the second temperature average is the second reference temperature.

[0019] In the above scheme, the first thermal management opening temperature is 1-5°C lower than the second thermal management opening temperature, the first target inlet temperature is 5-10°C higher than the second target inlet temperature, and the first thermal management closing temperature is 1-10°C higher than the second thermal management closing temperature.

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

[0021] an acquisition unit, configured to acquire a first minimum temperature of the battery when it is determined that the driving mode of the vehicle is the extended range mode;

[0022] A control unit, for controlling the battery thermal management strategy to start if it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating, until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and stops heating the antifreeze in the battery heating circuit; obtaining the first current actual temperature of the battery, and if it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, determining a first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery; and sending the first reference temperature to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze in the battery heating circuit to circulate for a preset time; wherein,

[0023] The first thermal management start-up temperature is lower than the second thermal management start-up temperature, and the first thermal management shutdown temperature is higher than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the pure electric mode when the driving mode is the driving mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the pure electric mode when the driving mode is the driving mode.

[0024] In the above solution, the control unit is also used for:

[0025] When it is determined that the driving mode of the vehicle is the pure electric mode, obtaining the second lowest temperature of the battery;

[0026] If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

[0027] In the above solution, the control unit is also used for:

[0028] When the driving mode is the pure electric mode, when it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, a second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature.

[0029] A third aspect of the present invention provides a vehicle, the vehicle comprising a battery management system as described in any one of the second aspects.

[0030] The present invention provides a battery thermal management method, a battery management system and a vehicle for an extended-range electric vehicle, the method comprising: when it is determined that the driving mode of the vehicle is the extended-range mode, obtaining a first minimum temperature of the battery; if it is determined that the first minimum temperature is lower than a first thermal management start-up temperature, controlling the battery thermal management strategy to start, so that a vehicle-mounted controller VCU controls the antifreeze in a battery heating circuit to start heating and circulating, until a first current inlet temperature of the battery heating circuit is consistent with a first target inlet temperature, and then stops heating the antifreeze in the battery heating circuit; obtaining a first current actual temperature of the battery, and if it is determined that the first current actual temperature is greater than a first thermal management shutdown temperature, determining a first reference temperature according to a first maximum temperature of the battery and a first minimum temperature of the battery; and sending the first reference temperature to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze in the battery heating circuit to circulate for a preset time; wherein the first thermal management start-up temperature is less than a first target inlet temperature. At the second thermal management start-up temperature, the first thermal management shutdown temperature is greater than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the pure electric mode when the driving mode is the pure electric mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the pure electric mode when the driving mode is the pure electric mode; in this way, thermal management is performed separately in the pure electric mode and the extended-range mode, and since the temperature range corresponding to the thermal management in the extended-range mode (the range between the start-up temperature and the shutdown temperature) is wider than the temperature range corresponding to the thermal management in the pure electric mode, the battery heating circuit can make full use of the engine waste heat for heating cycle in the extended-range mode, and will not consume the energy of the battery itself, thereby greatly improving the power characteristics of the vehicle; and after the battery thermal management strategy is turned off, the first target inlet temperature is always between the first highest temperature of the battery and the first lowest temperature of the battery, so the antifreeze heating cycle can ensure that the battery temperature difference gradually decreases, which is equivalent to directly reducing the battery temperature difference compared to the prior art solution, thereby improving the battery life. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] 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.

[0032] In the attached picture:

[0033] Figure 1 A schematic flow chart of a battery thermal management method for a range-extended electric vehicle according to an embodiment of the present invention is shown;

[0034] Figure 2A logic schematic diagram of a battery thermal management method according to an embodiment of the present invention is shown;

[0035] Figure 3 A schematic diagram of the structure of a battery management system according to an embodiment of the present invention is shown;

[0036] Figure 4 A schematic diagram of the vehicle structure according to an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0037] 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.

[0038] The embodiment of the present invention provides a battery thermal management method for an extended-range electric vehicle, which is applied in a battery management system (BMS). Figure 1 and Figure 2 As shown, the method comprises the following steps:

[0039] S110, when it is determined that the driving mode of the vehicle is the extended-range mode, obtaining a first minimum temperature of the battery;

[0040] The driving modes of extended-range vehicles include pure electric mode and extended-range mode. In pure electric mode, the engine is not running, while in extended-range mode, the engine directly participates in the operation of the vehicle. Therefore, determining the vehicle's behavior mode as extended-range mode includes:

[0041] Get the engine speed. If it is determined that the engine speed is greater than 0, it means that the driving mode is the extended range mode.

[0042] If it is determined that the engine speed is 0, it means that the driving mode is pure electric mode.

[0043] Specifically, the engine management system (EMS) will read the engine speed signal and send the engine speed signal to the vehicle control unit (VCU). The VCU will send the engine speed signal to the BMS, so that the BMS can obtain the engine speed.

[0044] When it is determined that the vehicle's driving mode is the extended-range mode, it is necessary to obtain the first minimum temperature of the battery, which can be understood as the minimum temperature of the battery in the extended-range mode; when it is determined that the vehicle's driving mode is the pure electric mode, it is necessary to obtain the second minimum temperature of the battery, which can be understood as the minimum temperature of the battery in the pure electric mode.

[0045] S111, if it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, the battery thermal management strategy is controlled to be turned on, so that the antifreeze in the battery heating circuit of the vehicle controller VCU starts to be heated and circulated until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and the heating of the antifreeze in the battery heating circuit is stopped;

[0046] If it is determined that the first minimum temperature is lower than the first thermal management activation temperature, it means that the battery temperature is too low and the battery needs to be heated up, then the battery thermal management strategy is controlled to be activated.

[0047] When the battery thermal management strategy is turned on, it is equivalent to the BMS sending a heating request to the VCU. Then the VCU can control the antifreeze in the battery heating circuit to start heating and circulating according to the heating request, and collect the first current inlet temperature of the battery heating circuit (the temperature of the antifreeze at the inlet of the heating circuit) in real time. If it is determined that the first current inlet temperature is consistent with the first target inlet temperature, it means that the first current inlet temperature of the battery has risen to the expected value. At this time, the heating of the antifreeze in the battery heating circuit can be stopped.

[0048] Similarly, when the driving mode of the vehicle is the pure electric mode, the method further includes:

[0049] If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit (the temperature of the antifreeze at the inlet of the heating circuit) is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

[0050] Here, the first thermal management start-up temperature is lower than the second thermal management start-up temperature, and the first thermal management shutdown temperature is higher than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the pure electric mode when the driving mode is the pure electric mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the pure electric mode when the driving mode is the pure electric mode.

[0051] Generally speaking, the first thermal management opening temperature is 1-5°C lower than the second thermal management opening temperature, the first target inlet temperature is 5-10°C higher than the second target inlet temperature, and the first thermal management closing temperature is 1-10°C higher than the second thermal management closing temperature.

[0052] That is, this embodiment separately controls the battery thermal management of the pure electric mode and the extended-range mode, and broadens the thermal management temperature range for the extended-range mode on the basis of the pure electric mode, which is equivalent to starting the battery thermal management strategy early and delaying the shutdown of the battery thermal management strategy when performing thermal management on the battery in the extended-range mode. Then, in the extended-range mode, the engine waste heat can be well utilized for the heating cycle, and no additional energy consumption of the battery itself will be consumed, thereby greatly improving the vehicle's power characteristics.

[0053] S112, obtaining a first current actual temperature of the battery, and if it is determined that the first current actual temperature is greater than a first thermal management shutdown temperature, determining a first reference temperature according to a first maximum temperature of the battery and a first minimum temperature of the battery; and sending the first reference temperature to a VCU, so that the VCU adjusts a first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls a preset circulation time of the antifreeze solution in the battery heating circuit;

[0054] Furthermore, in order to reduce the battery temperature difference, when the driving mode is the extended-range mode, the BMS also needs to obtain the first current actual temperature of the battery. If it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, the first reference temperature is determined according to the first maximum temperature of the battery and the first minimum temperature of the battery; and the first reference temperature is sent to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature; the first target inlet temperature is between the first maximum temperature and the first minimum temperature.

[0055] In one implementation, determining the first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery includes:

[0056] A first temperature average of the first maximum temperature and the first minimum temperature is obtained; the first temperature average is the first reference temperature.

[0057] That is, in the extended-range mode, the BMS sends the first reference temperature to the VCU in real time. The VCU can dynamically adjust the first target inlet temperature of the battery heating circuit based on the first reference temperature to ensure that the first target inlet temperature is between the first minimum temperature and the first maximum temperature. Preferably, the first target inlet temperature is set to the first reference temperature. In this way, when the antifreeze in the battery circuit continuously circulates for a preset time, it can ensure that the battery temperature difference gradually decreases. Compared with the prior art solution, it is equivalent to directly reducing the battery temperature difference, thereby improving the battery life. Among them, the preset time can be determined based on the characteristics of the vehicle, such as 1 to 5 minutes, and there is no restriction here.

[0058] Similarly, in pure electric mode, if it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, the second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature.

[0059] In one implementation, determining the second reference temperature according to the second highest temperature of the battery and the second lowest temperature of the battery includes:

[0060] A second temperature average of the second highest temperature and the second lowest temperature is obtained; the second temperature average is the second reference temperature.

[0061] That is, in pure electric mode, when the battery thermal management strategy is turned off, the second target inlet temperature of the battery heating circuit is dynamically adjusted to ensure that the second target inlet temperature is between the second minimum temperature and the second maximum temperature, and preferably the second target inlet temperature is set to the second reference temperature. In this way, when the antifreeze in the battery circuit is continuously circulated, the battery temperature difference can be ensured to be gradually reduced, which is equivalent to directly reducing the battery temperature difference compared to the prior art solution, thereby improving the battery life.

[0062] Without changing the vehicle hardware, this embodiment divides the driving mode of the extended-range vehicle into a pure electric mode and an extended-range mode, and performs thermal management separately in the pure electric mode and the extended-range mode. Since the temperature range corresponding to the thermal management in the extended-range mode (the range between the turn-on temperature and the turn-off temperature) is wider than the temperature range corresponding to the thermal management in the pure electric mode, the battery heating circuit can make full use of the engine waste heat for heating cycle in the extended-range mode without additionally consuming the energy consumption of the battery itself, thereby greatly improving the vehicle's power characteristics; and after the battery thermal management strategy is turned off, the first target inlet temperature is always between the first highest temperature of the battery and the first lowest temperature of the battery. Therefore, when the antifreeze is heated and circulated, it can be ensured that the battery temperature difference gradually decreases, which is equivalent to directly reducing the battery temperature difference compared to the prior art solution, thereby improving the battery life.

[0063] Based on the same inventive concept as the above-mentioned embodiment, this embodiment also provides a battery management system, such as Figure 3 As shown, the battery management system includes:

[0064] An acquisition unit 31, configured to acquire a first minimum temperature of the battery when it is determined that the driving mode of the vehicle is the extended range mode;

[0065] The control unit 32 is used to control the battery thermal management strategy to start if it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, so that the vehicle controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and stops heating the antifreeze in the battery heating circuit; when the battery thermal management strategy is turned off, obtain the first current actual temperature of the battery, if it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, determine the first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery; and send the first reference temperature to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze in the battery heating circuit to circulate for a preset time; wherein,

[0066] The first thermal management start-up temperature is lower than the second thermal management start-up temperature, and the first thermal management shutdown temperature is higher than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the pure electric mode when the driving mode is the driving mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the pure electric mode when the driving mode is the driving mode.

[0067] In one embodiment, the control unit is further configured to:

[0068] When it is determined that the driving mode of the vehicle is the pure electric mode, obtaining the second lowest temperature of the battery;

[0069] If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

[0070] In one embodiment, the control unit is further configured to:

[0071] When the driving mode is the pure electric mode, when it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, a second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature.

[0072] Since the battery management system introduced in the embodiment of the present invention is a battery management system adopted for implementing the battery thermal management method of the extended-range electric vehicle in the embodiment of the present invention, based on the method introduced in the embodiment of the present invention, those skilled in the art can understand the specific structure and deformation of the system, so they will not be repeated here.

[0073] Based on the same inventive concept, this embodiment also provides a vehicle, such as Figure 4 As shown, it includes: engine management system EMS, vehicle controller VCU and battery management system BMS; among which,

[0074] The engine management system EMS is used to read the engine speed signal and send the engine speed signal to the vehicle controller VCU;

[0075] The VCU is used to send the engine speed signal to the battery management system BMS;

[0076] BMS is used to determine the vehicle's driving mode based on the engine speed signal, and determine the corresponding battery thermal management strategy based on the driving mode. The specific structure of the battery management system BMS and the implementation principle of thermal management can be referred to the specific content above, so it will not be repeated here.

[0077] Through one or more embodiments of the present invention, the present invention has the following beneficial effects or advantages:

[0078] The present invention provides a battery thermal management method, a battery management system and a vehicle for an extended-range electric vehicle, the method comprising: when it is determined that the driving mode of the vehicle is the extended-range mode, obtaining a first minimum temperature of the battery; if it is determined that the first minimum temperature is lower than a first thermal management start-up temperature, controlling the battery thermal management strategy to start, so that a vehicle-mounted controller VCU controls the antifreeze in a battery heating circuit to start heating and circulating, until a first current inlet temperature of the battery heating circuit is consistent with a first target inlet temperature, and then stops heating the antifreeze in the battery heating circuit; when the battery thermal management strategy is turned off, obtaining a first current actual temperature of the battery, if it is determined that the first current actual temperature is greater than a first thermal management shut-off temperature, determining a first reference temperature according to a first maximum temperature of the battery and a first minimum temperature of the battery; and sending the first reference temperature to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze in the battery heating circuit to circulate for a preset time; wherein the first thermal The management start-up temperature is less than the second thermal management start-up temperature, and the first thermal management shutdown temperature is greater than the second thermal management shutdown temperature; the second thermal management start-up temperature is the thermal management start-up temperature corresponding to the driving mode of the pure electric mode, and the second thermal management shutdown temperature is the thermal management shutdown temperature corresponding to the driving mode of the pure electric mode; in this way, the pure electric mode and the extended-range mode are thermally managed separately, and because the temperature range corresponding to the thermal management in the extended-range mode (the range between the start-up temperature and the shutdown temperature) is wider than the temperature range corresponding to the thermal management in the pure electric mode, the battery heating circuit can make full use of the engine waste heat for heating cycle in the extended-range mode, and will not consume the energy of the battery itself, thereby greatly improving the power characteristics of the vehicle; and after the battery thermal management strategy is turned off, the first target inlet temperature is always between the first highest temperature of the battery and the first lowest temperature of the battery, so the antifreeze heating cycle can ensure that the battery temperature difference gradually decreases, which is equivalent to directly reducing the battery temperature difference compared to the prior art solution, thereby improving the battery life.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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 battery thermal management method for an extended-range electric vehicle, characterized in that: The method comprises: When it is determined that the driving mode of the vehicle is the extended-range mode, obtaining a first minimum temperature of the battery; If it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, the battery thermal management strategy is controlled to be turned on, so that the vehicle controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and the heating of the antifreeze in the battery heating circuit is stopped; The first current actual temperature of the battery is obtained. If it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, a first reference temperature is determined according to the first maximum temperature of the battery and the first minimum temperature of the battery; and the first reference temperature is sent to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein, The first thermal management on-temperature is lower than the second thermal management on-temperature, and the first thermal management off-temperature is higher than the second thermal management off-temperature; the second thermal management on-temperature is the thermal management on-temperature corresponding to the pure electric mode when the driving mode is the driving mode, and the second thermal management off-temperature is the thermal management off-temperature corresponding to the pure electric mode when the driving mode is the driving mode; The determining the first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery comprises: A first temperature average of the first maximum temperature and the first minimum temperature is obtained; the first temperature average is the first reference temperature.

2. The method according to claim 1, characterized in that The method further comprises: When it is determined that the driving mode of the vehicle is the pure electric mode, obtaining the second lowest temperature of the battery; If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

3. The method according to claim 2, characterized in that The method further comprises: When the driving mode is the pure electric mode, when it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, a second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature; The determining the second reference temperature according to the second highest temperature of the battery and the second lowest temperature of the battery comprises: A second temperature average of the second maximum temperature and the second minimum temperature is obtained; the second temperature average is the second reference temperature.

4. The method according to claim 2, characterized in that The first thermal management opening temperature is 1-5° C. lower than the second thermal management opening temperature, the first target inlet temperature is 5-10° C. higher than the second target inlet temperature, and the first thermal management closing temperature is 1-10° C. higher than the second thermal management closing temperature.

5. A battery management system, characterized in that: The battery management system comprises: an acquisition unit, configured to acquire a first minimum temperature of the battery when it is determined that the driving mode of the vehicle is the extended range mode; A control unit, for controlling the battery thermal management strategy to start if it is determined that the first minimum temperature is lower than the first thermal management start-up temperature, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating, until the first current inlet temperature of the battery heating circuit is consistent with the first target inlet temperature, and stops heating the antifreeze in the battery heating circuit; obtaining the first current actual temperature of the battery, and if it is determined that the first current actual temperature is greater than the first thermal management shutdown temperature, determining a first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery; and sending the first reference temperature to the VCU, so that the VCU adjusts the first target inlet temperature of the battery heating circuit according to the first reference temperature, and controls the antifreeze in the battery heating circuit to circulate for a preset time; wherein, The first thermal management on-temperature is lower than the second thermal management on-temperature, and the first thermal management off-temperature is higher than the second thermal management off-temperature; the second thermal management on-temperature is the thermal management on-temperature corresponding to the pure electric mode when the driving mode is the driving mode, and the second thermal management off-temperature is the thermal management off-temperature corresponding to the pure electric mode when the driving mode is the driving mode; The determining the first reference temperature according to the first maximum temperature of the battery and the first minimum temperature of the battery comprises: A first temperature average of the first maximum temperature and the first minimum temperature is obtained; the first temperature average is the first reference temperature.

6. The system according to claim 5, characterized in that The control unit is also used for: When it is determined that the driving mode of the vehicle is the pure electric mode, obtaining the second lowest temperature of the battery; If it is determined that the second minimum temperature is lower than the second thermal management start-up temperature, the battery thermal management strategy is controlled to start, so that the on-board controller VCU controls the antifreeze in the battery heating circuit to start heating and circulating until the second current inlet temperature of the battery heating circuit is consistent with the second target inlet temperature, and stops heating the antifreeze in the battery heating circuit.

7. The system according to claim 5, characterized in that The control unit is also used for: When the driving mode is the pure electric mode, when it is determined that the second current actual temperature of the battery is greater than the corresponding second thermal management shutdown temperature, a second reference temperature is determined according to the second maximum temperature of the battery and the second minimum temperature of the battery, and the second reference temperature is sent to the VCU, so that the VCU adjusts the second target inlet temperature of the battery heating circuit according to the second reference temperature, and controls the antifreeze liquid in the battery heating circuit to circulate for a preset time; wherein the second target inlet temperature is between the second minimum temperature and the second maximum temperature; The determining the second reference temperature according to the second highest temperature of the battery and the second lowest temperature of the battery comprises: A second temperature average of the second maximum temperature and the second minimum temperature is obtained; the second temperature average is the second reference temperature.

8. A vehicle, characterized in that: The vehicle includes a battery management system as described in any one of claims 5 to 7.

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