Power battery heating control method

Abstract

The invention discloses a power battery heating control method which is characterized in that the power battery heating control method is applied to a power battery heating system, the power battery heating system comprises a plurality of heating modules, and the heating modules are arranged outside a power battery pack and connected with the power battery pack or arranged in the power battery pack; the power battery heating control method comprises the following steps: acquiring a maximum cell temperature value and a minimum cell temperature value of the power battery pack; and controlling the plurality of heating modules to work in a preset heating mode according to the battery cell temperature maximum value and the battery cell temperature minimum value of the power battery pack. The problems of high battery cell and large low temperature difference in the battery pack at low temperature are solved; the cell temperature at the corner of the battery pack is low and the intermediate temperature is high; the problems that the temperature of a battery cell near a liquid inlet is high and the temperature near a liquid outlet is low are caused by a traditional liquid heating scheme.

Description

Technical Field

[0001] The present invention relates to the technical field of power battery heating, and in particular to a power battery heating control method. Background Art

[0002] With the popularity of new energy vehicles, the discharge capacity of power batteries at low temperatures becomes lower. The reduction in vehicle mileage in winter is a pain point in the industry. The discharge capacity of power batteries under all-weather conditions is increasingly valued. The cells inside the battery pack are arranged in rows. The temperature of the cells arranged in the middle is high, and the temperature of the cells in the four corners is low. The discharge capacity of low-temperature cells is the shortcoming of the system. At the same time, the large temperature difference between the high and low temperatures of the battery pack can easily lead to power battery failure. The traditional battery pack heating solution is to direct the heated coolant and refrigerant into the flow channel of the battery pack, but this method will cause the temperature of the cells near the liquid inlet to be high, and the temperature of the cells near the liquid outlet to be low. At the same time, the position of the inlet and outlet is different from that of the low-temperature cells. At the same time, the heating of existing battery packs is a passive response, and there is no active management based on the status of the vehicle. Summary of the invention

[0003] The present application provides a power battery heating control method to at least solve one technical problem existing in the related art.

[0004] According to one aspect of an embodiment of the present application, a power battery heating control method is provided, which is applied to a power battery heating system, including multiple heating modules, and the multiple heating modules are respectively arranged outside the power battery pack and connected to the power battery pack, or are arranged inside the power battery pack; the power battery heating control method includes: obtaining the maximum value and the minimum value of the battery cell temperature of the power battery pack; controlling the multiple heating modules to operate in a preset heating mode according to the maximum value and the minimum value of the battery cell temperature of the power battery pack.

[0005] As an optional embodiment, the heating module includes a plurality of heating films arranged at four angular positions in the power battery pack; controlling the plurality of heating modules to operate in a preset heating mode according to the maximum value of the battery cell temperature and the minimum value of the battery cell temperature of the power battery pack includes: judging whether the minimum value of the battery cell temperature is in a first preset minimum temperature range, and whether the maximum value of the battery cell temperature is in a preset maximum temperature range; if the minimum value of the battery cell temperature is in the first preset minimum temperature range, and the maximum value of the battery cell temperature is in the preset maximum temperature range, controlling the plurality of heating films to operate in the first heating mode.

[0006] As an optional embodiment, controlling the multiple heating films to operate in the first heating mode includes: respectively obtaining the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack; respectively determining the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack; respectively judging whether the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack meets the preset difference conditions; if the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack meets the preset difference conditions, controlling the heating films at the positions corresponding to the battery module cells whose difference with the lowest cell temperature of the power battery pack meets the preset conditions to start heating until the lowest cell temperature is no longer in the first preset lowest temperature range.

[0007] As an optional implementation, the first preset minimum temperature range includes (-5)°C to 5°C; the preset maximum temperature range includes less than 40°C.

[0008] As an optional embodiment, the heating module includes a pulse heating module connected to the power battery pack; controlling the multiple heating modules to operate in a preset heating mode according to the maximum value of the battery cell temperature and the minimum value of the battery cell temperature of the power battery pack includes: judging whether the minimum value of the battery cell temperature is in a second preset minimum temperature range, and whether the maximum value of the battery cell temperature is in a preset maximum temperature range; if the minimum value of the battery cell temperature is in the second preset minimum temperature range, and the maximum value of the battery cell temperature is in the preset maximum temperature range, controlling the pulse heating module to operate, and the cab control panel outputting an output signal for indicating entry into the first heating mode to remind the driver.

[0009] As an optional implementation, the second preset minimum temperature range includes (-10)°C to (-5)°C; the preset maximum temperature range includes less than 40°C.

[0010] As an optional embodiment, the heating module includes a thermal management liquid thermal module connected to the power battery pack; the controlling the plurality of heating modules to work in a preset heating mode according to the maximum value and the minimum value of the battery cell temperature of the power battery pack includes:

[0011] Determine whether the lowest temperature of the battery cell is within a third preset lowest temperature range, and whether the highest temperature of the battery cell is within a preset highest temperature range;

[0012] If the lowest value of the battery cell temperature is within the third preset lowest temperature range, and the highest value of the battery cell temperature is within the preset highest temperature range, the thermal management liquid thermal module is controlled to operate; the cab control panel outputs an output signal representing turning on the pulse heating module to remind the driver.

[0013] As an optional implementation, the second preset minimum temperature range includes less than (-10)°C; the preset maximum temperature range includes less than 40°C.

[0014] As an optional embodiment, the heating module includes a thermal management liquid thermal module, which is connected to the power battery pack; controlling the multiple heating modules to operate in a preset heating mode according to the maximum cell temperature and the minimum cell temperature of the power battery pack also includes: judging whether the minimum cell temperature is in a fourth preset minimum temperature range; if the minimum cell temperature is in the fourth preset minimum temperature range, judging whether the difference between the maximum cell temperature and the minimum cell temperature is greater than the preset temperature difference; if the difference between the maximum cell temperature and the minimum cell temperature is greater than the preset temperature difference, controlling the self-circulation mode of the thermal management liquid thermal module to open.

[0015] As an optional implementation, the fourth preset minimum temperature range includes greater than 5°C.

[0016] In an embodiment of the present application, a power battery heating control method is provided, which is applied to a power battery heating system, including multiple heating modules, which are respectively arranged outside the power battery pack and connected to the power battery pack, or arranged inside the power battery pack; the power battery heating control method includes: obtaining the maximum value and the minimum value of the battery cell temperature of the power battery pack; controlling the multiple heating modules to work in a preset heating mode according to the maximum value and the minimum value of the battery cell temperature of the power battery pack. The problem of large temperature difference between high and low temperatures of the battery cells in the battery pack at low temperatures; low temperature of the battery cells in the corners of the battery pack and high temperature in the middle; high temperature of the battery cells near the liquid inlet and low temperature near the liquid outlet caused by the traditional liquid heating solution is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a schematic flow chart of a power battery heating control method provided according to an embodiment of the present application.

[0020] Figure 2 It is a flow chart of another power battery heating control method provided according to an embodiment of the present application.

[0021] Figure 3 It is a structural schematic diagram of a power battery heating system provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0024] like Figure 1-2 As shown, an embodiment of the present application provides a power battery heating control method, which is applied to a power battery heating system, including multiple heating modules, and the multiple heating modules are respectively arranged outside the power battery pack and connected to the power battery pack, or arranged inside the power battery pack; the power battery heating control method includes:

[0025] S1 obtains the maximum value and the minimum value of the battery cell temperature of the power battery pack;

[0026] S2 controls the plurality of heating modules to operate in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack.

[0027] Specifically, the problems of high and low temperature differences of battery cells in the battery pack under low temperature; low temperature of battery cells in the corners of the battery pack and high temperature in the middle; high temperature of battery cells near the liquid inlet and low temperature near the liquid outlet caused by traditional liquid heating solutions are solved.

[0028] As an optional embodiment, the heating module includes a plurality of heating films arranged at four angular positions in the power battery pack; controlling the plurality of heating modules to operate in a preset heating mode according to the maximum value of the battery cell temperature and the minimum value of the battery cell temperature of the power battery pack includes: judging whether the minimum value of the battery cell temperature is in a first preset minimum temperature range, and whether the maximum value of the battery cell temperature is in a preset maximum temperature range; if the minimum value of the battery cell temperature is in the first preset minimum temperature range, and the maximum value of the battery cell temperature is in the preset maximum temperature range, controlling the plurality of heating films to operate in the first heating mode.

[0029] like Figure 3 As shown, four heating films can be provided, namely, heating film 1, heating film 2, heating film 3, and heating film 4 arranged at the corners of the battery pack, consuming the least amount of electricity to locally heat the low-temperature battery cells of the battery pack, and forming a radiation wall between the low-temperature battery cells in the battery pack and the environment, so as to minimize the temperature drop of the battery cells at the corners of the battery pack. Whether to enter the first heating mode is determined by whether the lowest value of the battery cell temperature is in the first preset lowest temperature range and whether the highest value of the battery cell temperature is in the preset highest temperature range.

[0030] As an optional embodiment, controlling the multiple heating films to operate in the first heating mode includes: respectively obtaining the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack; respectively determining the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack; respectively judging whether the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack meets the preset difference conditions; if the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest cell temperature of the power battery pack meets the preset difference conditions, controlling the heating films at the positions corresponding to the battery module cells whose difference with the lowest cell temperature of the power battery pack meets the preset conditions to start heating until the lowest cell temperature is no longer in the first preset lowest temperature range.

[0031] The control logic inside heating mode 1 can be: the vehicle controller identifies and numbers the battery modules at the four corners of the battery pack, and marks them as battery module 1, module 2, module 3, and module 4 respectively. The vehicle controller receives the low and high temperatures of the battery cells of the above modules from the battery pack, and records them as M1 T1, M1 T2, M2T1, M2T2, M3T1, M3T2, M4T1, and M4T2 respectively. At the same time, the vehicle controller also receives the minimum temperature Tmin and Tmax of the battery cells from the power battery pack. When the vehicle controller detects that the minimum value of the battery cell temperature is in the first preset minimum temperature range, and the maximum value of the battery cell temperature is in the preset maximum temperature range, it will calculate the difference between Tmin and M1 T1, M2T1, M3T1, and M4T1 respectively, and record them as ΔT1, ΔT2, ΔT3, and ΔT4 respectively. As long as the preset difference conditions are met, the corresponding heating film will be turned on.

[0032] Among them, the preset difference condition can be set within ±2°C, which is not limited in this application and can be determined according to actual conditions.

[0033] In addition, it may also include that if after the heating film is turned on, the lowest value of the battery cell temperature is still in the first preset lowest temperature range within a preset time period, the thermal management liquid thermal module and / or the pulse heating module may be directly turned on.

[0034] As an optional implementation, the first preset minimum temperature range includes (-5)°C to 5°C; the preset maximum temperature range includes less than 40°C.

[0035] As an optional embodiment, the heating module includes a pulse heating module connected to the power battery pack; controlling the multiple heating modules to operate in a preset heating mode according to the maximum value of the battery cell temperature and the minimum value of the battery cell temperature of the power battery pack includes: judging whether the minimum value of the battery cell temperature is in a second preset minimum temperature range, and whether the maximum value of the battery cell temperature is in a preset maximum temperature range; if the minimum value of the battery cell temperature is in the second preset minimum temperature range, and the maximum value of the battery cell temperature is in the preset maximum temperature range, controlling the pulse heating module to operate, and the cab control panel outputting an output signal for indicating entry into the first heating mode to remind the driver.

[0036] As an optional implementation, the second preset minimum temperature range includes (-10)°C to (-5)°C; the preset maximum temperature range includes less than 40°C.

[0037] When the vehicle controller determines that the lowest value of the battery cell temperature is in the second preset lowest temperature range, and the highest value of the battery cell temperature is in the preset highest temperature range, it indicates that the battery is in a low temperature environment, and then starts the pulse heating module, and prompts the customer to choose to turn on the first heating mode.

[0038] As an optional embodiment, the heating module includes a thermal management liquid thermal module connected to the power battery pack; the controlling the plurality of heating modules to work in a preset heating mode according to the maximum value and the minimum value of the battery cell temperature of the power battery pack includes:

[0039] Determine whether the lowest temperature of the battery cell is within a third preset lowest temperature range, and whether the highest temperature of the battery cell is within a preset highest temperature range;

[0040] If the lowest value of the battery cell temperature is within the third preset lowest temperature range, and the highest value of the battery cell temperature is within the preset highest temperature range, the thermal management liquid thermal module is controlled to operate; the cab control panel outputs an output signal representing turning on the pulse heating module to remind the driver.

[0041] As an optional implementation, the second preset minimum temperature range includes less than (-10)°C; the preset maximum temperature range includes less than 40°C.

[0042] Specifically, when the vehicle controller determines that the lowest value of the battery cell temperature is in the third preset lowest temperature range, and the highest value of the battery cell temperature is in the preset highest temperature range, it indicates that the battery is in an extremely low temperature environment, then the thermal management liquid thermal module is started, and the customer is prompted to choose to turn on the pulse heating module; if the lowest value of the battery cell temperature is not in the third preset lowest temperature range, and the highest value of the battery cell temperature is in the preset highest temperature range, it indicates that the battery is in a defined low temperature range, or the battery has a large difference between high and low temperatures.

[0043] As an optional embodiment, the heating module includes a thermal management liquid thermal module, which is connected to the power battery pack; controlling the multiple heating modules to operate in a preset heating mode according to the maximum cell temperature and the minimum cell temperature of the power battery pack also includes: judging whether the minimum cell temperature is in a fourth preset minimum temperature range; if the minimum cell temperature is in the fourth preset minimum temperature range, judging whether the difference between the maximum cell temperature and the minimum cell temperature is greater than the preset temperature difference; if the difference between the maximum cell temperature and the minimum cell temperature is greater than the preset temperature difference, controlling the self-circulation mode of the thermal management liquid thermal module to open.

[0044] As an optional implementation, the fourth preset minimum temperature range includes greater than 5°C.

[0045] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0046] If the integrated units in the above embodiments are implemented in the form of software functional units and sold or used as independent products, they can be stored in the above computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling one or more electronic devices (such as personal computers, servers, or network devices) to perform all or part of the steps of the methods described in the various embodiments of the present application.

[0047] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0048] In the several embodiments provided in the present application, it should be understood that the disclosed client can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0049] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution provided in this embodiment.

[0050] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0051] In the above embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments.

[0052] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A power battery heating control method, characterized in that: Applied to a power battery heating system, comprising a plurality of heating modules, wherein the plurality of heating modules are respectively arranged outside a power battery pack and connected to the power battery pack, or arranged inside the power battery pack; the power battery heating control method comprises: Obtaining the maximum value and the minimum value of the battery cell temperature of the power battery pack; The plurality of heating modules are controlled to operate in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack.

2. The power battery heating control method according to claim 1, characterized in that: The heating module includes a plurality of heating films arranged at four angles in the power battery pack; and controlling the plurality of heating modules to work in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack includes: Determine whether the lowest temperature of the battery cell is within a first preset lowest temperature range, and whether the highest temperature of the battery cell is within a preset highest temperature range; If the lowest value of the battery core temperature is within the first preset lowest temperature range, and the highest value of the battery core temperature is within the preset highest temperature range, the plurality of heating films are controlled to operate in a first heating mode.

3. The power battery heating control method according to claim 2, characterized in that: The controlling the plurality of heating films to operate in the first heating mode comprises: Obtain the low temperature values ​​of the battery module cells at four angles in the power battery pack respectively; Determine the difference between the low temperature value of the battery module cells at four angular positions in the power battery pack and the lowest temperature value of the battery cells of the power battery pack respectively; Determine respectively whether the difference between the low temperature value of the battery module cells at four angular positions in the power battery pack and the lowest temperature value of the battery cells of the power battery pack meets the preset difference condition; If the difference between the low temperature values ​​of the battery module cells at the four angular positions in the power battery pack and the lowest temperature of the battery cells of the power battery pack meets the preset difference condition, the heating films at the positions corresponding to the battery module cells whose difference with the lowest temperature of the battery cells of the power battery pack meets the preset condition are controlled to start heating until the lowest temperature of the battery cells is no longer in the first preset lowest temperature range.

4. The power battery heating control method according to claim 2, characterized in that: The first preset minimum temperature range includes (-5)°C to 5°C; the preset maximum temperature range includes less than 40°C.

5. The power battery heating control method according to claim 2, characterized in that: The heating module includes a pulse heating module connected to the power battery pack; the controlling the plurality of heating modules to work in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack includes: Determine whether the lowest temperature of the battery cell is within a second preset lowest temperature range, and whether the highest temperature of the battery cell is within a preset highest temperature range; If the minimum value of the battery cell temperature is within the second preset minimum temperature range, and the maximum value of the battery cell temperature is within the preset maximum temperature range, the pulse heating module is controlled to operate, and the cab control panel outputs an output signal indicating entry into the first heating mode to alert the driver.

6. The power battery heating control method according to claim 5, characterized in that: The second preset minimum temperature range includes (-10)°C to (-5)°C; the preset maximum temperature range includes less than 40°C.

7. The power battery heating control method according to claim 5, characterized in that: The heating module includes a thermal management liquid thermal module connected to the power battery pack; the controlling the plurality of heating modules to work in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack includes: Determine whether the lowest temperature of the battery cell is within a third preset lowest temperature range, and whether the highest temperature of the battery cell is within a preset highest temperature range; If the lowest value of the battery cell temperature is within the third preset lowest temperature range, and the highest value of the battery cell temperature is within the preset highest temperature range, the thermal management liquid thermal module is controlled to operate; the cab control panel outputs an output signal representing turning on the pulse heating module to remind the driver.

8. The power battery heating control method according to claim 8, characterized in that: The second preset minimum temperature range includes less than (-10)°C; the preset maximum temperature range includes less than 40°C.

9. The power battery heating control method according to claim 1, characterized in that: The heating module includes a thermal management liquid thermal module connected to the power battery pack; the controlling the plurality of heating modules to work in a preset heating mode according to the maximum temperature value and the minimum temperature value of the battery cells of the power battery pack also includes: Determining whether the lowest value of the battery core temperature is within a fourth preset lowest temperature range; If the lowest value of the battery core temperature is within a fourth preset lowest temperature interval, determining whether a difference between the highest value of the battery core temperature and the lowest value of the battery core temperature is greater than a preset temperature difference; If the difference between the maximum temperature of the battery core and the minimum temperature of the battery core is greater than a preset temperature difference, the self-circulation mode of the thermal management liquid thermal module is controlled to be turned on.

10. The power battery heating control method according to claim 9, characterized in that: The fourth preset minimum temperature range includes greater than 5°C.

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