Heating temperature difference treatment method, device, equipment and medium

Abstract

The invention provides a heating temperature difference processing method, the heating temperature difference processing method is applied to a battery heating system, the battery heating system comprises a main heating loop and a plurality of heating branches, the plurality of heating branches are connected in parallel and then are connected in series with the main heating loop, and each heating branch heats a battery module in a battery pack. Each battery module comprises a plurality of battery cells, and the heating temperature difference processing method comprises the following steps: judging whether a battery pack meets a heating condition or not; acquiring the initial temperature of each battery cell in the battery pack in response to meeting the heating condition; heating all the battery modules; judging whether the battery heating system meets a stop condition or not in real time during heating; when the battery heating system meets the stopping condition, the main heating loop and all the heating branches are disconnected, the heating films are divided according to the modules, the heating branches are correspondingly controlled by monitoring the temperature difference between the battery cells, and the temperature difference of the battery cells in the whole battery system can be effectively controlled.

Description

Technical Field

[0001] The present invention relates to the field of battery core temperature control, and in particular to a heating temperature difference processing method, device, equipment and medium. Background Art

[0002] Currently, battery packs usually have multiple battery modules inside. The heating methods of the battery cells in the battery modules can be divided into two types: hot liquid heating and heating film heating. Liquid heating is to heat the liquid through PTC, and then the heated liquid is used to conduct heat to the battery cells, thereby increasing the temperature of the battery cells. The heating film heating method is to heat the battery cells by energizing the heating film to generate heat. Especially when using the heating film for heating, due to the different initial battery cell temperature differences and the different temperature rises of each battery cell during the heating process, the overall battery cell temperature difference is large at the end of the actual heating. Summary of the invention

[0003] The object of the present invention is to provide a heating temperature difference processing method, device, equipment and medium, which reduce the temperature difference of the battery cell during the heating process.

[0004] In order to achieve the above-mentioned object, the present invention provides the following technical solutions: a heating temperature difference processing method, the heating temperature difference processing method is applied to a battery heating system, the battery heating system comprises a main heating circuit and a plurality of heating branches, the plurality of heating branches are connected in parallel with each other and then connected in series with the main heating circuit, each of the heating branches heats a battery module in a battery pack, each of the battery modules comprises a plurality of battery cells, the heating temperature difference processing method comprises the following steps: judging whether the battery pack meets the heating conditions; in response to meeting the heating conditions, collecting the initial temperature of each of the battery cells in the battery pack; calculating the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ; Determine the initial difference T mean Is it greater than the first preset temperature difference? When the initial difference T mean When the temperature difference is not greater than the first preset temperature difference, all the battery modules are heated; during heating, it is determined in real time whether the battery heating system meets the stop condition; when the battery heating system meets the stop condition, the main heating circuit and all the heating branches are disconnected.

[0005] Further, in determining the initial difference T mean Whether it is greater than the first preset temperature difference value, it also includes: when the initial difference T mean When the temperature difference is greater than the first preset temperature difference, the initial temperature is adjusted to the initial minimum temperature T min The temperature of the battery cell.

[0006] Furthermore, the initial temperature is adjusted to be the initial minimum temperature T min The temperature of the battery cell includes: determining that the initial minimum temperature T min The battery module and the detected initial maximum temperature T max whether the battery module is the same battery module; when the initial minimum temperature T is detected min The battery module and the detected initial maximum temperature T max When the battery module is a different module, the initial minimum temperature T min The battery module is heated until the initial minimum temperature T min The corresponding real-time temperature of the battery cell is equal to the initial maximum temperature T max The difference is not greater than the first preset temperature difference; otherwise, the initial minimum temperature T is detected. min The battery module is heated until the initial minimum temperature T min The real-time temperature of the corresponding battery cell is not less than the initial average temperature T of all the battery cells. ave Then disconnect the main heating circuit and all the heating branches.

[0007] Furthermore, during the heating, determining in real time whether the battery heating system meets the stop condition comprises: extracting the real-time maximum temperature T of all the battery cells in the battery pack. max1 、The real-time minimum temperature T of all the cells min1 , and the real-time average temperature T of all the cells in the battery pack ave1 ; Set the maximum temperature limit value T set1 , average temperature limit value T set2 and the minimum temperature limit T set3 ; When the real-time maximum temperature T is monitored max1 Exceeding the maximum temperature limit value, the real-time average temperature T ave1 Exceeding the average temperature limit value T set2 Or the real-time minimum temperature T min1 Exceeding the minimum temperature limit T set3 When the battery heating system satisfies the stop condition, it is determined that the battery heating system satisfies the stop condition.

[0008] Furthermore, when the initial difference T mean When the temperature difference is not greater than the first preset temperature difference value, after determining in real time whether the battery heating system meets the stop condition during the heating, the method further includes: when the battery heating system does not meet the stop condition, setting a second preset temperature difference value; obtaining the real-time maximum temperature T max1 and the real-time minimum temperature T min1 Real-time temperature difference T mean1 ; When the real-time temperature difference Tmean1 When the temperature difference is greater than the second preset temperature difference, the real-time maximum temperature T is adjusted. max1 The corresponding heating state of the battery cell.

[0009] Furthermore, the adjustment of the real-time minimum temperature T min1 The corresponding heating state of the battery cell includes: obtaining the average temperature T of all the battery cells in the battery pack at the current moment ave2 ; Get the current maximum temperature T max2 and the minimum temperature T min2 , determine the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 Whether the corresponding battery cells are in the same battery module; when the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 When the corresponding battery cells are in the same battery module, the lowest temperature T min2 The battery module is heated until the minimum temperature T min2 The temperature of the corresponding battery cell is not less than the average temperature T ave2 , after which the real-time minimum temperature T is detected min1 Otherwise, disconnect the heating branch of the battery module detected by the highest temperature T max2 The heating branch of the battery module.

[0010] Furthermore, the first preset temperature difference value is smaller than the second preset temperature difference value.

[0011] On the other hand, a heating temperature difference processing device is provided, comprising: a first condition judgment mechanism, which judges whether the battery pack meets the heating condition; a temperature collection mechanism, which collects the initial temperature of each battery cell in the battery pack in response to meeting the heating condition; and a temperature difference calculation mechanism, which calculates the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ; The second condition judgment mechanism judges the initial difference T mean Is it greater than a first preset temperature difference? The first heating control mechanism, when the initial difference T mean When the temperature difference is not greater than the first preset temperature difference, all the battery modules are heated; a third condition judgment mechanism judges in real time during heating whether the battery heating system meets the stop condition; a second heating control mechanism disconnects the main heating circuit and all the heating branches when the battery heating system meets the stop condition.

[0012] On the other hand, an electronic device is provided, comprising: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned heating temperature difference processing method.

[0013] On the other hand, a computer-readable storage medium is provided, in which at least one instruction, at least one program, code set or instruction set is stored, and the at least one instruction, at least one program, code set or instruction set is loaded by a processor and executes the above-mentioned heating temperature difference processing method.

[0014] From the analysis, it can be known that the present invention discloses a method for processing heating temperature difference. The present invention divides the heating film according to the modules, so that the heating film at each module becomes an independent heating branch and each part is processed in parallel. By monitoring the temperature sampling points on each module, the points with lower temperature can be accurately heated. By monitoring the temperature difference between the battery cells and controlling the heating branch accordingly, the temperature difference of each battery cell in the whole battery system can be effectively controlled. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0016] Figure 1 A circuit diagram of a battery heating portion according to an embodiment of the present invention.

[0017] Figure 2 Flowchart of an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0019] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numbers and letter labels to refer to features in the drawings. Like or similar labels in the drawings and description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first", "second", "third", and "fourth", etc. are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0020] like Figure 1-Figure 2 As shown, according to an embodiment of the present invention, a heating temperature difference processing method is provided, which is applied to a battery heating system, wherein the battery heating system includes a main heating circuit and multiple heating branches, the multiple heating branches are connected in parallel with each other and then in series with the main heating circuit, each heating branch heats a battery module in the battery pack, that is, one heating branch corresponds to one battery module, and the heating branch is used to heat the battery module corresponding to the heating branch, and each battery module includes multiple battery cells.

[0021] The heating method adopted by the battery heating system is heating film heating. The heating film is divided into the whole, so that the heating film at each battery module becomes an independent heating branch, and each heating branch is processed in parallel and connected in series with the main heating circuit. In conjunction with the battery management system, it can ensure that the overall battery cell temperature difference is within a small range at the end of heating. Each heating branch can independently heat a battery module. The heating branch can realize heating control of the battery module only when the main heating circuit is turned on.

[0022] Figure 1 In the circuit, the electrical circuit of the non-heating part of the battery consists of a main positive relay, a main negative relay, a pre-charge relay, and a pre-charge resistor.

[0023] The above-mentioned heating temperature difference treatment method comprises the following steps:

[0024] Step S101, determining whether the battery pack meets the heating conditions;

[0025] The above-mentioned heating conditions usually include the existence of the minimum sampling temperature, maximum sampling temperature and average sampling temperature of the battery cell being lower than the threshold of the heating start condition corresponding to the respective temperature set by the system; it can be understood that if any of the minimum sampling temperature, maximum sampling temperature and average sampling temperature of the battery cell is lower than the corresponding requirement, the battery cell needs to be heated at this time, and it is judged that the heating conditions are preliminarily met. Since the battery pack includes multiple battery modules, and the battery module includes multiple battery cells, when it is judged that the battery cell meets the heating conditions, it can also be judged that the battery pack including the battery cell meets the heating conditions accordingly.

[0026] While meeting the above-mentioned temperature conditions required for heating, it is usually necessary to determine whether the corresponding electronic components are in normal working condition. For example, the heating relay must not have any adhesion or inability to close to determine that the battery module meets the heating conditions.

[0027] The battery module that meets the heating conditions is in a state of waiting for heating, and heating is not started at this time. The heating conditions can be set according to actual working requirements, and this embodiment does not limit the specific content of the heating conditions.

[0028] Step S102 , in response to satisfying the heating condition, collecting the initial temperature of each battery cell in the battery pack.

[0029] The temperature of all cells in the battery pack is collected, so that the temperature state of the cells before heating, that is, the initial temperature of each cell, can be obtained.

[0030] Step S103, calculating the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ;

[0031] After collecting the initial temperature of each battery cell, the initial maximum temperature T can be obtained. max With the initial minimum temperature T mi , and then calculate the difference between the two to get the initial difference T mean . Initial difference T mean It can reflect whether the battery cells can be heated normally. Too large a temperature difference will cause some battery cells to fail to heat to the required temperature or the temperature of some battery cells to exceed the upper temperature limit.

[0032] Step S104, determine the initial difference T mean Is it greater than the first preset temperature difference value?

[0033] The first preset temperature difference may be 1.5°C-2.5°C, and may be 1.5°C, 1.75°C, 2.0°C, 2.25°C, 2.5°C, and preferably 2.0°C.

[0034] When the initial difference T mean When the temperature difference is greater than the first preset value, the initial temperature is adjusted to the initial minimum temperature T min The temperature of the battery cell, that is, the adjustment with the initial minimum temperature T min The temperature of the corresponding battery cell is adjusted by heating.

[0035] The above adjustment initial temperature is the initial minimum temperature T min The temperature of the battery cell includes: judging the initial minimum temperature T min The battery module and the initial maximum temperature T max Whether the battery modules are the same battery modules, the initial minimum temperature T min The battery module refers to the initial temperature is the initial minimum temperature T min The battery module where the battery cell is located has an initial maximum temperature T max The battery module refers to the initial temperature is the initial maximum temperature T max The battery module where the battery cell is located; when the initial minimum temperature T min The battery module and the initial maximum temperature T maxWhen the battery modules are different modules, the initial minimum temperature T min The battery module is heated until the initial minimum temperature T min The corresponding real-time temperature of the battery cell and the initial maximum temperature T max The difference between the initial minimum temperature T and the initial minimum temperature T is not greater than the first preset temperature difference value. After the difference between the initial minimum temperature T and the initial minimum temperature T is not greater than the first preset temperature difference value, the main heating circuit and all heating branches are disconnected. Otherwise, the initial minimum temperature T is detected. min The battery module is heated until the initial minimum temperature T min The real-time temperature of the corresponding battery cell is not less than the initial average temperature T of all battery cells. ave After that, disconnect the main heating circuit and all heating branches. In this scenario, the initial minimum temperature T min The battery modules are heated, and the other battery modules are not heated, that is, the initial minimum temperature T min The heating branch corresponding to the battery module is in the on state, and the heating branches corresponding to other modules are in the off state. When the main heating circuit and the initial minimum temperature T are disconnected, min When the heating branch corresponding to the battery module is disconnected, it can also be called disconnecting the main heating circuit and all heating branches; wherein, when the battery module is heated, if the battery heating system meets the stop condition, the main heating circuit and all heating branches are disconnected.

[0036] Step S105, when the initial difference T mean When the temperature difference is not greater than the first preset temperature difference value, all battery modules are heated;

[0037] When this step is performed, the heating circuit and all heating branches are in the on state.

[0038] Step S106, during heating, determining in real time whether the battery heating system meets the stop condition.

[0039] The above-mentioned real-time determination of whether the battery heating system meets the stop condition includes: extracting the real-time maximum temperature T of all cells in the battery pack max1 、The real-time minimum temperature T of all cells min1 , and the real-time average temperature T of all cells in the battery pack ave1 ; Get the real-time maximum temperature T max1 and real-time minimum temperature T min1 Real-time temperature difference T mean1 ; Set the maximum temperature limit value T set1 , average temperature limit value T set2 and the minimum temperature limit T set3 ; When the real-time maximum temperature T is detected max1 Exceeding the maximum temperature limit value, real-time average temperature T ave1Exceeding the average temperature limit value T set2 Or real-time minimum temperature T min1 Exceeding the minimum temperature limit T set3 When the battery heating system meets the stop condition.

[0040] Step S107: when the battery heating system meets the stop condition, the main heating circuit and all heating branches are disconnected.

[0041] When the battery heating system does not meet the stop condition, set the second preset temperature difference value; obtain the real-time maximum temperature T max1 and real-time minimum temperature T min1 Real-time temperature difference T mean1 ; When the real-time temperature difference T mean1 When the temperature difference is greater than the second preset value, the real-time maximum temperature T is adjusted. max1 The corresponding heating state of the battery cell, when the real-time temperature difference T mean1 When the temperature is less than the second preset temperature difference, the previous heating state is maintained.

[0042] The above adjustment real-time minimum temperature T min1 The corresponding heating state of the battery cell includes: obtaining the average temperature T of all battery cells at the current moment ave2 ; Get the current maximum temperature T max2 and the minimum temperature T min2 , determine the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 Whether the corresponding battery cells are in the same battery module; when the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 When the corresponding cells are in the same battery module, the lowest temperature T min2 The battery module is heated until the minimum temperature T min2 The temperature of the corresponding battery cell is not less than the average temperature T ave2 , then disconnect and detect the real-time minimum temperature T min1 Otherwise, disconnect the detected maximum temperature T max2 The heating branch of the battery module.

[0043] The above-mentioned first preset temperature difference value is smaller than the second preset temperature difference value, and the second preset temperature difference value may be 2.5°C-3.5°C, and may be selected as 2.5°C, 2.75°C, 3.0°C, 3.25°C, 3.5°C, and preferably 3.0°C.

[0044] The present invention also discloses a heating temperature difference processing device, comprising: a first condition judgment mechanism, which judges whether the battery pack meets the heating condition; a temperature collection mechanism, which collects the initial temperature of each battery cell in the battery pack in response to meeting the heating condition; a temperature difference calculation mechanism, which calculates the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ; The second condition judgment mechanism judges the initial difference T mean Is it greater than the first preset temperature difference? The first heating control mechanism, when the initial difference T mean When the temperature difference is not greater than the first preset temperature difference, all battery modules are heated; the third condition judgment mechanism judges in real time whether the battery heating system meets the stop condition during heating; the second heating control mechanism disconnects the main heating circuit and all heating branches when the battery heating system meets the stop condition.

[0045] The present invention also discloses an electronic device, which includes: a processor and a memory for storing executable instructions of the processor; wherein the processor is configured to execute the above-mentioned heating temperature difference processing method.

[0046] The present invention also discloses a computer-readable storage medium, in which at least one instruction, at least one program, code set or instruction set is stored. The at least one instruction, at least one program, code set or instruction set is loaded and executed by a processor to implement the above-mentioned heating temperature difference processing method.

[0047] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: the present invention divides the heating film according to modules, so that the heating film at each module becomes an independent heating branch and each part is processed in parallel, and by monitoring the temperature sampling points on each module, the points with lower temperatures can be accurately heated; by monitoring the temperature difference between the battery cells and performing corresponding control of the heating branch, the temperature difference of each battery cell in the entire battery system can be effectively controlled.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A heating temperature difference treatment method, characterized in that: The heating temperature difference processing method is applied to a battery heating system, wherein the battery heating system comprises a main heating circuit and a plurality of heating branches, wherein the plurality of heating branches are connected in parallel to the main heating circuit in series, and each of the heating branches heats a battery module in a battery pack, and each of the battery modules comprises a plurality of battery cells. The heating temperature difference processing method comprises the following steps: Determine whether the battery pack meets the heating conditions; In response to satisfying a heating condition, collecting an initial temperature of each of the battery cells in the battery pack; Calculate the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ; Determine the initial difference T mean Whether it is greater than a first preset temperature difference value; When the initial difference T mean When the temperature difference is not greater than the first preset temperature difference value, heating all the battery modules; During heating, determining in real time whether the battery heating system meets a stop condition; When the battery heating system meets the stop condition, the main heating circuit and all the heating branches are disconnected.

2. A heating temperature difference treatment method according to claim 1, characterized in that: In determining the initial difference T mean Whether it is greater than the first preset temperature difference value also includes: When the initial difference T mean When the temperature difference is greater than the first preset temperature difference, the initial temperature is adjusted to the initial minimum temperature T min The temperature of the battery cell.

3. A heating temperature difference treatment method according to claim 2, characterized in that: The initial temperature is adjusted to be the initial minimum temperature T min The temperature of the battery cell includes: Determine the initial minimum temperature T detected min The battery module and the detected initial maximum temperature T max whether the battery modules are the same battery modules; When the initial minimum temperature T is detected min The battery module and the detected initial maximum temperature T max When the battery module is a different module, the initial minimum temperature T min The battery module is heated until the initial minimum temperature T min The corresponding real-time temperature of the battery cell is equal to the initial maximum temperature T max The difference is not greater than the first preset temperature difference; Otherwise, the initial minimum temperature T is detected. min The battery module is heated until the initial minimum temperature T min The real-time temperature of the corresponding battery cell is not less than the initial average temperature T of all the battery cells. ave Then disconnect the main heating circuit and all the heating branches.

4. A heating temperature difference treatment method according to claim 2, characterized in that: The real-time determination of whether the battery heating system meets the stop condition during heating includes: Extract the real-time maximum temperature T of all the cells in the battery pack max1 、The real-time minimum temperature T of all the cells min1 , and the real-time average temperature T of all the cells in the battery pack ave1 ; Set the maximum temperature limit value T set1 , average temperature limit value T set2 and the minimum temperature limit T set3 ; When the real-time maximum temperature T is monitored max1 Exceeding the maximum temperature limit value, the real-time average temperature T ave1 Exceeding the average temperature limit value T set2 Or the real-time minimum temperature T min1 Exceeding the minimum temperature limit T set3 When the battery heating system satisfies the stop condition, it is determined that the battery heating system satisfies the stop condition.

5. A heating temperature difference treatment method according to claim 4, characterized in that: When the initial difference T mean When the temperature difference is not greater than the first preset temperature difference, after determining in real time during the heating whether the battery heating system meets the stop condition, the method further includes: When the battery heating system does not meet the stop condition, setting a second preset temperature difference value; Get the real-time maximum temperature T max1 and the real-time minimum temperature T min1 Real-time temperature difference T mean1 ; When the real-time temperature difference T mean1 When the temperature difference is greater than the second preset temperature difference, the real-time maximum temperature T is adjusted. max1 The corresponding heating state of the battery cell.

6. A heating temperature difference treatment method according to claim 5, characterized in that: The adjustment of the real-time minimum temperature T min1 The corresponding heating state of the battery cell includes: Get the average temperature T of all the cells in the battery pack at the current moment ave2 ; Get the current maximum temperature T max2 and the minimum temperature T min2 , Determine the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 Whether the corresponding battery cells are in the same battery module; When the maximum temperature T max2 The corresponding battery cell and minimum temperature T min2 When the corresponding battery cells are in the same battery module, the lowest temperature T min2 The battery module is heated until the minimum temperature T min2 The temperature of the corresponding battery cell is not less than the average temperature T ave2 , after which the real-time minimum temperature T is detected min1 The heating branch of the battery module; Otherwise, disconnect the detected maximum temperature T max2 The heating branch of the battery module.

7. A heating temperature difference treatment method according to claim 6, characterized in that: The first preset temperature difference value is smaller than the second preset temperature difference value.

8. A heating temperature difference processing device, characterized in that: include: A first condition judgment mechanism, judging whether the battery pack meets the heating condition; A temperature collection mechanism, in response to satisfying a heating condition, collects an initial temperature of each of the battery cells in the battery pack; Temperature difference calculation mechanism, calculates the collected initial maximum temperature T max With the initial minimum temperature T min The initial difference T mean ; The second condition judgment mechanism judges the initial difference T mean Whether it is greater than a first preset temperature difference value; The first heating control mechanism, when the initial difference T mean When the temperature difference is not greater than the first preset temperature difference value, heating all the battery modules; a third condition judgment mechanism, for judging in real time during heating whether the battery heating system satisfies a stop condition; The second heating control mechanism disconnects the main heating circuit and all the heating branches when the battery heating system meets the stop condition.

9. An electronic device, characterized in that: The electronic device comprises: a processor and a memory for storing executable instructions of the processor; Wherein, the processor is configured to execute the heating temperature difference processing method described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores at least one instruction, at least one program, code set or instruction set, and the at least one instruction, at least one program, code set or instruction set is loaded and executed by the processor to implement the heating temperature difference processing method described in any one of claims 1-7.

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