A thermal management device and method for a power battery pack

Abstract

The present application relates to a power battery pack thermal management device and method. The power battery pack thermal management device includes: an adjustment module, including a first adjustment unit, a second adjustment unit and a driving unit, the first adjustment unit is provided with a heat conduction channel, the second adjustment unit is provided with a heat insulation element for opening and closing the heat conduction channel, wherein the driving unit is connected to the first adjustment unit and the second adjustment unit respectively to drive the first adjustment unit and / or the second adjustment unit to move and change the opening of the heat conduction channel; it also includes an acquisition module and a control module for acquiring vehicle status parameters; the control module connects the drive unit and the acquisition module, and determines the opening of the heat conduction channel according to the vehicle status parameters and preset condition parameters. The use of this method can improve the disadvantage of the prior art that the heat conduction structure cannot flexibly adjust the heat conduction capacity.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a thermal management device and method for a power battery pack. Background Art

[0002] The power battery pack is the power source of electric vehicles and the most core component of the vehicle. The power battery has a large operating current and generates a lot of heat. At the same time, the battery pack is in a relatively closed environment, so high requirements are placed on heat dissipation.

[0003] In the traditional power battery pack structure, in order to improve the heat dissipation capacity, materials with excellent thermal conductivity are often set in the power battery pack as fillings, such as thermal conductive silicone gaskets, so that part of the heat can be dissipated from the power battery casing. However, this method of setting fixed thermal conductivity measures has a huge defect, that is, the fixed thermal conductivity measures cannot flexibly adjust the thermal conductivity according to the vehicle status. Summary of the invention

[0004] Based on this, a power battery pack thermal management device and method are provided to improve the shortcoming of the prior art that the thermal conductive structure cannot flexibly adjust the thermal conductive capacity.

[0005] In one aspect, a power battery pack thermal management device is provided, comprising:

[0006] The regulating module comprises a first regulating unit, a second regulating unit and a driving unit, wherein the first regulating unit is provided with a heat conduction channel, and the second regulating unit is provided with a heat insulation element for opening and closing the heat conduction channel, wherein the driving unit is connected to the first regulating unit and the second regulating unit respectively to drive the first regulating unit and / or the second regulating unit to move and change the opening of the heat conduction channel;

[0007] An acquisition module, used to acquire vehicle status parameters;

[0008] A control module is connected to the driving unit and the acquisition module, and determines the opening of the heat conduction channel according to the vehicle state parameter and a preset condition parameter.

[0009] In one embodiment, the power battery pack includes a battery cell module and a shell, the shell includes a bottom guard plate, and the adjustment module is disposed between the bottom guard plate and the battery cell module.

[0010] In one embodiment, the first regulating unit comprises a first heat insulation board, and a first opening is formed on the first heat insulation board;

[0011] The second regulating unit comprises a second heat insulation board, a second opening is formed on the second heat insulation board, and a portion outside the second opening serves as the heat insulation element;

[0012] Wherein, the spacing between the second openings is not less than the aperture of the first openings.

[0013] In one embodiment, the acquisition module includes at least one of the following: a vehicle speed acquisition unit, a charging power acquisition unit, and a battery temperature detection unit.

[0014] In one embodiment, the acquisition module further includes a collision detection unit.

[0015] On the other hand, a power battery pack thermal management method is provided, which is implemented by using the power battery pack thermal management device, and includes:

[0016] Get vehicle status parameters;

[0017] The opening degree of the heat conduction channel is determined according to the vehicle state parameter and the preset condition parameter.

[0018] In one embodiment, the obtaining of vehicle state parameters includes: obtaining a vehicle driving speed value;

[0019] Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes:

[0020] When the speed value of the vehicle is greater than or equal to a preset speed threshold, determining that the opening of the heat conduction channel is a first preset opening;

[0021] When the driving speed value of the vehicle is less than a preset speed threshold, the opening degree of the heat conduction channel is determined to be a second preset opening degree.

[0022] In one embodiment, the obtaining of vehicle status parameters includes: obtaining a charging power value of the vehicle;

[0023] Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes:

[0024] When the charging power value of the vehicle is greater than or equal to a preset charging power threshold, determining that the opening of the heat conduction channel is a third preset opening;

[0025] When the charging power value of the vehicle is less than a preset charging power threshold, the opening degree of the heat conduction channel is determined to be a fourth preset opening degree.

[0026] In one embodiment, the obtaining of vehicle status parameters includes: obtaining the real-time temperature inside the power battery pack;

[0027] Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes:

[0028] When the real-time temperature inside the power battery pack is greater than or equal to a preset thermal runaway temperature value, determining that the opening of the heat conduction channel is a fifth preset opening;

[0029] When the real-time temperature inside the power battery pack is less than a preset thermal runaway temperature value, the opening of the heat conduction channel is determined to be a sixth preset opening.

[0030] In one embodiment, the obtaining of vehicle state parameters includes: obtaining a collision intensity value;

[0031] Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes:

[0032] When the acquired collision strength value is greater than or equal to a preset collision strength threshold, determining that the opening of the heat conduction channel is a seventh preset opening;

[0033] When the acquired collision strength value is less than a preset collision strength threshold, it is determined that the opening degree of the heat conduction channel is an eighth preset opening degree.

[0034] The above-mentioned power battery pack thermal management device and method include an adjustment module, an acquisition module and a control module. The first adjustment unit and the second adjustment unit set in the adjustment module can be moved by a driving unit. The control module obtains the vehicle state parameters through the acquisition module and dynamically changes the opening of the heat conduction channel in the adjustment module according to the vehicle state parameters, thereby realizing flexible adjustment of the thermal conductivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a structural diagram of a thermal management device for a power battery pack in one embodiment;

[0036] Figure 2 is a schematic diagram of a first regulating unit and a second regulating unit in one embodiment;

[0037] Figure 3 It is a schematic diagram of the installation of a thermal management device for a power battery pack in one embodiment;

[0038] Figure 4 is a schematic diagram of the positions of the first adjusting unit and the second adjusting unit in another embodiment;

[0039] Figure 5 is a schematic diagram of another position of the first adjusting unit and the second adjusting unit in another embodiment;

[0040] Figure 6 A schematic diagram of a flow chart of a thermal management method for a power battery pack in another embodiment;

[0041] Figure 7 A step-by-step correspondence diagram between the vehicle speed value and the opening degree proposed in another embodiment;

[0042] Figure 8 A schematic diagram of a flow chart of a thermal management method for a power battery pack in another embodiment;

[0043] Reference numerals: first regulating unit 100 , heat conduction channel 101 , second regulating unit 200 , heat insulation element 201 , battery cell module 301 , bottom guard plate 302 , upper cover 303 , box body 304 , liquid cooling plate 305 . DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0045] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be a random change, and the component layout type may also be more complicated. The structure, ratio, size, etc. illustrated in the drawings of the present specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0046] The power battery pack has a large operating current and generates a lot of heat. At the same time, the battery pack is in a relatively closed environment, which will cause the temperature of the battery to rise. The heat dissipation of the power battery pack has always been a research focus. A more classic way is to conduct and dissipate the heat inside the power battery pack by filling it with materials with high thermal conductivity. However, blindly enhancing its thermal conductivity will affect the performance of the power battery pack in some scenarios. For example, when the external ambient temperature is higher than the battery pack temperature, heat may even flow back.

[0047] The present invention provides a power battery pack thermal management device, which can adjust the thermal conductivity of the power battery pack according to the state of the vehicle to flexibly adapt to various scenarios.

[0048] like Figure 1 As shown, in one embodiment, the power battery pack thermal management device includes:

[0049] The regulating module comprises a first regulating unit 100, a second regulating unit 200 and a driving unit, wherein the first regulating unit 100 is provided with a heat conducting channel 101, and the second regulating unit 200 is provided with a heat insulating element 201 for opening and closing the heat conducting channel 101, wherein the driving unit is respectively connected to the first regulating unit 100 and the second regulating unit 200 to drive the first regulating unit 100 and / or the second regulating unit 200 to move and change the opening of the heat conducting channel 101.

[0050] One arrangement of the regulating module is to arrange it outside the power battery pack.

[0051] The heat-conducting channel 101 is illustrated as an example. The heat-conducting channel 101 is filled with a medium having a better thermal conductivity than the rest of the first adjustment unit 100, such as silicone grease. Heat from the power battery pack can be conducted outward through the heat-conducting channel 101. The heat-insulating element 201 is made of a material with excellent thermal insulation properties, such as glass fiber or aerogel.

[0052] The opening of the heat-conducting channel 101 can be represented by the ratio of the open area of ​​the heat-conducting channel 101 to the cross-sectional area of ​​the heat-conducting channel 101. For example, when the heat-conducting channel 101 is completely closed by the heat-insulating element 201, the opening is recorded as 0%; when the heat-insulating element 201 completely avoids the heat-conducting channel 101, the opening is recorded as 100%.

[0053] The driving unit is used to drive at least one of the first adjusting unit 100 or the second adjusting unit 200 to move. For example, when the first adjusting unit 100 is kept fixed, the second adjusting unit 200 is driven to move to adjust the opening of the heat conduction channel 101 .

[0054] It is understandable that the opening of the heat conduction channel 101 can be indirectly represented by the relative position of the first adjustment unit 100 and the second adjustment unit 200, such as Figure 2 In the adjustment module shown, when the second adjustment unit 200 is driven to the right dead point, the heat conduction channel 101 is completely exposed and the opening is 100%; when the second adjustment unit 200 is driven to the left dead point, the heat conduction channel 101 is completely closed and the opening is 0%; when the second adjustment unit 200 is located at any position between the left and right dead points, there is a linear correspondence between the driving distance X of the second adjustment unit 200 and the opening, so one implementation method for determining the opening is to control the driving distance X of the second adjustment unit 200.

[0055] By way of example, a structure of the driving unit includes a driving motor, a ball screw and a nut seat arranged on the ball screw, and the second adjusting unit 200 is connected to the nut seat.

[0056] The power battery pack thermal management device also includes an acquisition module and a control module, wherein the acquisition module is used to acquire vehicle status parameters; the control module is respectively connected to the drive unit and the acquisition module, and determines the opening of the heat conduction channel 101 according to the vehicle status parameters and preset condition parameters.

[0057] Exemplarily, the vehicle state parameter includes a vehicle driving state parameter or a charging state parameter, and the preset condition parameter is a judgment condition set corresponding to the vehicle state parameter, for example, a speed threshold is set, and before the vehicle speed reaches the speed threshold, the opening of the heat conduction channel 101 is maintained at a certain value, and after reaching the speed threshold, the opening of the heat conduction channel 101 is adjusted to another value.

[0058] In the above embodiment, by acquiring the vehicle state parameters and according to the preset condition parameters, the opening of the heat conduction channel 101 is flexibly adjusted to meet the high heat dissipation demand or low heat dissipation demand of the current vehicle.

[0059] In one embodiment, the acquisition module includes a vehicle speed acquisition unit for acquiring the real-time vehicle speed. The corresponding preset condition parameter is a preset speed threshold, such as 100 km / h. Before the vehicle speed reaches 100 km / h, the output power of the power battery pack can be considered to be so low that the heat generation is not significant, or it is sufficient to maintain the power battery pack at a good temperature under the normal power consumption of the power battery pack cooling system; when the vehicle speed exceeds the above speed threshold, the output power of the power battery pack increases significantly, and the control module adjusts the opening of the heat conduction channel 101 through the drive unit, specifically, increases the opening to enhance heat conduction.

[0060] In the above embodiment, by obtaining the vehicle speed when the vehicle is in motion, it is determined whether the vehicle speed exceeds a threshold value. When the vehicle speed exceeds the threshold value, the opening of the heat conduction channel 101 is increased, and the high-speed airflow when the vehicle is in motion is used to take away a large amount of heat generated by the increased vehicle speed, thereby increasing the speed of heat dissipation without increasing the energy consumption required for heat dissipation of the liquid cooling system.

[0061] In one embodiment, the acquisition module includes a charging power acquisition unit for acquiring the charging power value of the vehicle. The corresponding preset condition parameter is a preset charging power threshold. Before the charging power value reaches the threshold, the heat generated by the power battery pack can rely on existing heat dissipation and heat conduction measures to keep the power battery pack temperature in a suitable state; when the charging power value exceeds the threshold, the heat generation power of the power battery pack increases, and the control module adjusts the opening of the heat conduction channel 101 through the driving unit to increase the opening and enhance heat dissipation.

[0062] In the above embodiment, the charging power value under the charging state is obtained by the charging power acquisition unit. When the charging power threshold is not exceeded, the heat insulation element 201 is used to maintain a small opening of the heat conduction channel 101 to reduce the heat exchange between the inside and outside of the power battery pack, and avoid unnecessary heat exchange with the outside when the temperature of the battery itself is not high. For example, in the low temperature state in winter, keeping the heat conduction channel 101 closed is beneficial to the insulation of the power battery pack. For example, in the high temperature state in summer, keeping the heat conduction channel 101 closed prevents the backflow of external heat.

[0063] It is understandable that, in the parked and non-charging state, the charging power value can be considered to be 0, and the control module thus determines the opening of the heat conduction channel 101 to be 0%.

[0064] In one embodiment, the acquisition module includes a battery temperature detection unit for acquiring the real-time temperature inside the power battery pack, and the control module determines the opening of the heat conduction channel 101 according to the real-time temperature inside the power battery pack acquired by the battery temperature detection unit.

[0065] By way of example, a linear correspondence is established between the temperature range inside the power battery pack and the opening range of the heat conduction channel 101 , and the opening of the heat conduction channel 101 is adjusted in real time according to the real-time temperature inside the power battery pack.

[0066] In another way, the temperature range inside the power battery pack is divided into multiple intervals, a gradient correspondence is established between different temperature intervals and different openings, and the opening of the heat conduction channel 101 is adjusted in a gradient according to the real-time temperature inside the power battery pack.

[0067] It is worth pointing out that the above two methods have the disadvantages of frequent adjustment module actions, huge power waste and high computing power overhead.

[0068] In another embodiment, the preset condition parameter is a preset thermal runaway temperature value. Before the internal temperature of the power battery pack reaches the preset thermal runaway temperature value, the heat conduction channel 101 is maintained at a smaller opening to avoid unnecessary mechanical movement. After the temperature of the power battery pack reaches the preset thermal runaway temperature, the heat conduction channel 101 of the adjustment module is adjusted to a larger opening for heat dissipation.

[0069] In one embodiment, the acquisition module also includes a collision detection unit for detecting the occurrence of a vehicle collision event, so that the power battery pack thermal management device of the present invention adjusts the opening of the heat conduction channel 101 to a preset opening, such as a maximum opening, when a collision occurs.

[0070] By way of example, the collision detection unit uses the absolute value of the vehicle's acceleration as a basis for determining the intensity of the collision suffered by the vehicle. When the absolute value of the vehicle's acceleration exceeds a preset intensity value, it is determined that a collision event has occurred, and the opening of the heat conduction channel 101 can be adjusted to the maximum to prepare for heat dissipation for possible thermal runaway of the power battery pack.

[0071] It should be understood that the technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0072] By way of example, when the acquisition module includes multiple parameter acquisition units, the control module can execute the process of acquiring parameters of different parameter acquisition units and determining the opening of the heat conduction channel 101 in a certain priority order. For example, in one embodiment, the acquisition module includes a vehicle speed acquisition unit, a charging power acquisition unit, a battery temperature detection unit, and a collision detection unit. To ensure the thermal stability of the power battery as a prerequisite, it is determined that the execution process of the collision detection unit has the highest priority, followed by the execution process of the battery temperature detection unit, then the execution process of the charging power acquisition unit, and finally the execution process of the vehicle speed acquisition unit.

[0073] The acquisition module and the control module can adopt various units that can realize adjustable signals, such as various single-chip microcomputers, microcontrollers, DSPs (digital signal processors), FPGAs (Field-Programmable Gate Arrays), host computers or central processing units (CPUs). In this embodiment, the controller can adopt a single-chip microcomputer, and various control functions can be realized by programming the single-chip microcomputer.

[0074] In one embodiment, the regulating module is disposed inside the power battery pack.

[0075] For example, Figure 3As shown, the power battery pack includes a battery cell module 301 and a shell. The shell includes a bottom guard plate 302. As a closed structure, the shell also includes an upper cover 303 and a box body 304. A liquid cooling plate 305 is also arranged inside the shell. The adjustment module is arranged between the bottom guard plate 302 and the battery cell module 301.

[0076] In the vehicle structure, the power battery pack is arranged at the bottom of the car, with the bottom guard plate 302 as protection to prevent the entry of impurities and dust. When the vehicle is running at high speed, the high-speed airflow at the bottom can take away the heat from the bottom. Therefore, when running at high speed, the opening of the heat conduction channel 101 is adjusted to 100%, which is beneficial to assist the liquid cooling system in heat dissipation.

[0077] like Figure 4-Figure 5 As shown, in one embodiment, the first regulating unit 100 includes a first thermal insulation board, on which a first opening is formed as the heat conduction channel 101; the second regulating unit 200 includes a second thermal insulation board, on which a second opening is formed, and the outer portion of the second opening serves as the thermal insulation element 201.

[0078] Exemplarily, the first insulation board is made of a material with excellent thermal insulation performance, such as glass fiber material, aerogel material, etc., and a plurality of the first openings are evenly provided thereon, and air is filled therein. The second insulation board has similar material and structural properties to the first insulation board, and is stacked under the first insulation board. When the driving unit drives the first insulation board or the second insulation board to move, the first opening is aligned with the second opening, such as Figure 4 , the heat from the battery module 301 is conducted to the outside through the air in the first opening and the second opening; when the first opening and the second opening are misaligned, such as Figure 5 , the cross-sectional area of ​​the air-connected channel (ie, the heat-conducting channel 101) is reduced, and the heat-conducting capacity is reduced.

[0079] In another embodiment, the fillers in the first opening and the second opening are not limited to air, and metal materials, composite materials, etc. having thermal conductivity better than the main body of the heat insulation board may also be used, but this will undoubtedly increase the manufacturing cost.

[0080] On the other hand, the regulating module is arranged inside the power battery pack, and uses gas as the filling medium of the opening. When thermal runaway, smoke from the battery cell module 301, fire, or other events occur, the opened heat conduction channel 101 can also be used as a pressure relief channel to allow the expanding gas inside the power battery pack to pass quickly. The expanding gas can rely on the deformation or rupture of the bottom guard plate 302, thereby reducing the risk of explosion of the power battery pack and the regulating module.

[0081] In one embodiment, the spacing between the second openings (the spacing between the opening edges) is not less than the aperture of the first opening to ensure that the heat conduction channel 101 is completely closed to improve the thermal insulation effect.

[0082] In one embodiment, a power battery pack thermal management method is provided, which is implemented using the power battery pack thermal management device, such as Figure 6 As shown, including:

[0083] Step 601, obtaining vehicle status parameters.

[0084] The vehicle status parameters include one or more of the vehicle speed value, the charging power value, the real-time temperature inside the power battery pack, or the collision strength value.

[0085] Step 602: Determine the opening of the heat conduction channel 101 according to the vehicle state parameters and preset condition parameters.

[0086] Exemplarily, the preset conditional parameters are preset thresholds corresponding to vehicle state parameters, such as a speed threshold corresponding to the vehicle's driving speed, a charging power threshold corresponding to the charging power value, a temperature threshold or a thermal runaway value corresponding to the real-time temperature inside the power battery pack, etc.

[0087] In one embodiment, the acquired vehicle state parameter is a vehicle speed value, and when the vehicle speed value is greater than or equal to a preset speed threshold, the opening of the heat conduction channel 101 is determined to be a first preset opening;

[0088] When the driving speed value of the vehicle is less than a preset speed threshold, the opening degree of the heat conduction channel 101 is determined to be a second preset opening degree.

[0089] Exemplarily, the speed threshold is a single threshold. When the vehicle speed reaches or exceeds the threshold, the first preset opening is 100%, that is, the heat conduction channel 101 is fully opened, otherwise it is the second preset opening -0%, that is, the heat conduction channel 101 is completely closed.

[0090] In another embodiment, the speed threshold is a multiple threshold, such as Figure 7 As shown, the first preset opening is a step parameter, such as 10%, 40%, 70%, 100%, and the second preset opening is also a step parameter, such as 0%, 10%, 40%, 70%. The opening of the heat conduction channel 101 changes in steps with the speed.

[0091] In one embodiment, the vehicle state parameter obtained is a charging power value of the vehicle. When the charging power value of the vehicle is greater than or equal to a preset charging power threshold, the opening of the heat conduction channel 101 is determined to be a third preset opening;

[0092] When the charging power value of the vehicle is less than a preset charging power threshold, the opening degree of the heat conduction channel 101 is determined to be a fourth preset opening degree.

[0093] For example, the charging power threshold is set to a fixed value. When the charging power value of the vehicle does not reach the fixed value, the opening of the heat conduction channel 101 adopts a fourth preset opening, such as 0%. When the charging power value of the vehicle reaches or exceeds the fixed value, the third preset opening is adopted, such as 100%.

[0094] The fixed value is designed according to the actual charging circuit of the vehicle and the heat dissipation requirements of the power battery pack, and is less than the maximum charging power during a single charging process.

[0095] In one embodiment, the vehicle state parameter obtained is the real-time temperature inside the power battery pack, and the preset condition parameter is the thermal runaway temperature value. When the real-time temperature inside the power battery pack is greater than or equal to the preset thermal runaway temperature value, the opening of the heat conduction channel 101 is determined to be a fifth preset opening, for example, 100%;

[0096] When the real-time temperature inside the power battery pack is lower than the preset thermal runaway temperature value, the opening of the heat conduction channel 101 is determined to be a sixth preset opening, such as 0%.

[0097] In one embodiment, the vehicle state parameter obtained is a collision strength value, and the preset condition parameter is a collision strength threshold. When the obtained collision strength value is greater than or equal to the preset collision strength threshold, the opening of the heat conduction channel 101 is determined to be a seventh preset opening, for example, 100%;

[0098] When the acquired collision strength value is less than a preset collision strength threshold, it is determined that the opening of the heat conduction channel 101 is an eighth preset opening, such as 0%.

[0099] In the above embodiment, the first preset opening, the third preset opening, the fifth preset opening, and the seventh preset opening are all the same 100%. In actual design, different values ​​may be used to adapt to different application scenarios.

[0100] In the above embodiment, the second preset opening, the fourth preset opening, the sixth preset opening, and the eighth preset opening are all 0%. In practical applications, different values ​​may be used to adapt to different scenarios.

[0101] In one embodiment, a plurality of vehicle status parameters are obtained, and the opening of the heat conduction channel 101 is determined according to the plurality of vehicle status parameters and preset condition parameters.

[0102] Determining the opening of the heat transfer channel 101 includes determining a pending opening and determining a final opening from the pending opening.

[0103] By way of example, the vehicle speed value, charging power value, real-time temperature inside the power battery pack, and collision intensity value are obtained simultaneously, the vehicle speed value is compared with a preset speed threshold, and a first pending opening is preliminarily determined; the charging power value is compared with the charging power threshold; a second pending opening is determined, and the real-time temperature inside the power battery pack is compared with the thermal runaway temperature value to determine a third pending opening; the collision intensity value is compared with the collision intensity threshold to determine a fourth pending opening, and the maximum value is selected from the first, second, third, and fourth pending openings as the final opening for execution.

[0104] In another embodiment, there are multiple vehicle state parameters, and the opening of the heat conduction channel 101 is determined according to a preset priority by combining the multiple vehicle state parameters with preset condition parameters.

[0105] For example, Figure 8 As shown, starting with an initial opening, for example, 0%, the collision strength value is first obtained. If the collision strength value is greater than or equal to the preset collision strength threshold, the opening of the heat conduction channel 101 is determined to be the seventh preset opening, for example, 100%, and the process ends; otherwise, the initial opening is maintained and the real-time temperature inside the power battery pack is continued to be obtained. If the real-time temperature inside the power battery pack is greater than or equal to the thermal runaway temperature value, the opening of the heat conduction channel 101 is determined to be the fifth preset opening, for example, 100%, and the process ends; otherwise, the initial opening is maintained and the charging power value is continued to be obtained. If the charging power value is greater than or equal to the preset charging power threshold, the opening of the heat conduction channel 101 is determined to be the third preset opening, for example, 100%, and the process ends; otherwise, the vehicle speed value is continued to be obtained. When the vehicle speed value is greater than or equal to the preset speed threshold, the opening of the heat conduction channel 101 is determined to be the first preset opening, for example, 100%, and the process ends, otherwise the initial opening is maintained.

[0106] In the above embodiment, the seventh preset opening, the fifth preset opening, the third preset opening, and the first preset opening use the same value. In another embodiment, gradually decreasing values ​​may be used.

[0107] It should be understood that although Figure 6 , 8 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 6 , 8At least part of the steps may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least part of the sub-steps or stages of other steps.

[0108] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A thermal management device for a power battery pack, characterized in that: include: The regulating module comprises a first regulating unit, a second regulating unit and a driving unit, wherein the first regulating unit is provided with a heat conduction channel, and the second regulating unit is provided with a heat insulation element for opening and closing the heat conduction channel, wherein the driving unit is connected to the first regulating unit and the second regulating unit respectively to drive the first regulating unit and / or the second regulating unit to move and change the opening of the heat conduction channel; An acquisition module, used to acquire vehicle status parameters; A control module, connected to the driving unit and the acquisition module, and determining the opening of the heat conduction channel according to the vehicle state parameter and a preset condition parameter; Among them, the vehicle status parameters include at least one of the vehicle driving speed value, charging power value, real-time temperature inside the power battery pack or collision intensity value; the preset condition parameters include the speed threshold, charging power threshold, thermal runaway temperature value or collision intensity threshold corresponding to the vehicle status parameters.

2. A power battery pack thermal management device according to claim 1, characterized in that: The power battery pack includes a battery cell module and a shell, the shell includes a bottom guard plate, and the adjustment module is arranged between the bottom guard plate and the battery cell module.

3. A power battery pack thermal management device according to claim 1, characterized in that: The first regulating unit comprises a first heat insulating plate, and a first opening is formed on the first heat insulating plate; The second regulating unit comprises a second heat insulation board, a second opening is formed on the second heat insulation board, and a portion outside the second opening serves as the heat insulation element; Wherein, the spacing between the second openings is not less than the aperture of the first openings.

4. A power battery pack thermal management device according to claim 1, characterized in that: The acquisition module includes at least one of the following: a vehicle speed acquisition unit, a charging power acquisition unit, and a battery temperature detection unit.

5. A power battery pack thermal management device according to claim 4, characterized in that: The acquisition module also includes a collision detection unit.

6. A power battery pack thermal management method, implemented by using the power battery pack thermal management device according to any one of claims 1 to 5, characterized in that: include: Get vehicle status parameters; Determining the opening of the heat conduction channel according to the vehicle state parameters and preset condition parameters; Among them, the vehicle status parameters include at least one of the vehicle driving speed value, charging power value, real-time temperature inside the power battery pack or collision intensity value; the preset condition parameters include the speed threshold, charging power threshold, thermal runaway temperature value or collision intensity threshold corresponding to the vehicle status parameters.

7. A power battery pack thermal management method according to claim 6, characterized in that: The obtaining of vehicle state parameters includes: obtaining a vehicle driving speed value; Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes: When the speed value of the vehicle is greater than or equal to a preset speed threshold, determining that the opening of the heat conduction channel is a first preset opening; When the driving speed value of the vehicle is less than a preset speed threshold, the opening degree of the heat conduction channel is determined to be a second preset opening degree.

8. A power battery pack thermal management method according to any one of claim 6, characterized in that: The obtaining of vehicle status parameters includes: obtaining a charging power value of the vehicle; Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes: When the charging power value of the vehicle is greater than or equal to a preset charging power threshold, determining that the opening of the heat conduction channel is a third preset opening; When the charging power value of the vehicle is less than a preset charging power threshold, the opening degree of the heat conduction channel is determined to be a fourth preset opening degree.

9. A power battery pack thermal management method according to claim 6, characterized in that: The obtaining of vehicle status parameters includes: obtaining the real-time temperature inside the power battery pack; Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes: When the real-time temperature inside the power battery pack is greater than or equal to a preset thermal runaway temperature value, determining that the opening of the heat conduction channel is a fifth preset opening; When the real-time temperature inside the power battery pack is less than a preset thermal runaway temperature value, the opening of the heat conduction channel is determined to be a sixth preset opening.

10. A power battery pack thermal management method according to claim 6, characterized in that: The obtaining of vehicle state parameters includes: obtaining a collision intensity value; Determining the opening of the heat conduction channel according to the vehicle state parameter and the preset condition parameter includes: When the acquired collision strength value is greater than or equal to a preset collision strength threshold, determining that the opening of the heat conduction channel is a seventh preset opening; When the acquired collision strength value is less than a preset collision strength threshold, it is determined that the opening of the heat conduction channel is an eighth preset opening.

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