Battery box body and automobile battery temperature control system

Abstract

The invention relates to the technical field of new energy automobiles, in particular to a battery box and an automobile battery temperature control system. The battery box body comprises a box body, an upper-layer heating film, a lower-layer heating film, a plurality of upper-layer battery cells and a plurality of lower-layer battery cells; the box body has a thickness direction and comprises a partition plate, an upper-layer groove body and a lower-layer groove body, wherein the upper-layer groove body and the lower-layer groove body are separated by the partition plate and distributed in the thickness direction. The plurality of upper-layer battery cells are arranged in the upper-layer groove body, the plurality of lower-layer battery cells are arranged in the lower-layer groove body, and the thickness direction of the upper-layer battery cells and the thickness direction of the lower-layer battery cells are both parallel to the thickness direction of the box body; the upper-layer heating film is attached to the upper surfaces of the plurality of upper-layer battery cells, and the lower-layer heating film is attached to the lower surfaces of the plurality of lower-layer battery cells. According to the battery box body and the automobile battery temperature control system, the problem that an existing battery pack rapid heating mode is low in heating efficiency is solved.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and in particular to a battery box and a vehicle battery temperature control system. Background Art

[0002] At present, with the increasing demand of users for fast charging of new energy vehicles, the safety issue of power batteries cannot be ignored. For example, fast charging of power batteries in low temperature environments may cause lithium deposition in the batteries, which in turn may lead to safety risks. Therefore, it is particularly important to design a battery pack that can be heated quickly.

[0003] The existing method of quickly heating the battery pack is to heat the sides of the battery pack by passing hot water through a liquid cooling plate, but the above heating method has low heating efficiency. Summary of the invention

[0004] The purpose of the present application is to provide a battery box and a car battery temperature control system, thereby solving the problem of low heating efficiency of the existing battery pack rapid heating method.

[0005] According to a first aspect of the present application, a battery case is provided, the battery case comprising a case body, an upper heating film, a lower heating film, a plurality of upper battery cells and a plurality of lower battery cells; the case body has a thickness direction, the case body comprising a partition and an upper trough body and a lower trough body arranged along the thickness direction and separated by the partition; the plurality of upper battery cells are arranged in the upper trough body, the plurality of lower battery cells are arranged in the lower trough body, the thickness direction of the upper battery cells and the thickness direction of the lower battery cells are both parallel to the thickness direction of the case body; the upper heating film is attached to the upper surfaces of the plurality of upper battery cells, and the lower heating film is attached to the lower surfaces of the plurality of lower battery cells.

[0006] In any of the above technical solutions, further, the box body also includes a frame, and the partition is a liquid cooling plate; the liquid cooling plate is connected to the inside of the frame to form the upper trough body and the lower trough body with the frame; the battery box body also includes a water inlet pipe and a water outlet pipe, and the water inlet pipe and the water outlet pipe both pass through the frame and are connected to the liquid cooling plate.

[0007] In any of the above technical solutions, further, the box body also includes multiple upper longitudinal beams and multiple lower longitudinal beams, and the box body has a length direction perpendicular to the thickness direction; the multiple upper longitudinal beams are all connected to the frame and extend along the length direction; the multiple upper longitudinal beams are all arranged in the upper trough body to divide the multiple upper battery cells into multiple groups; the multiple lower longitudinal beams are all connected to the frame and extend along the length direction; the multiple lower longitudinal beams are all arranged in the lower trough body to divide the multiple lower battery cells into multiple groups.

[0008] In any of the above technical solutions, further, the battery box also includes an upper cover, an upper elastic thermal insulation structure, a lower cover and a lower elastic thermal insulation structure; the upper elastic thermal insulation structure is extruded between the upper cover and the upper heating film; the lower elastic thermal insulation structure is extruded between the lower cover and the lower heating film.

[0009] In any of the above technical schemes, further, the battery box also includes a controller; the battery module composed of the multiple upper battery cells and the multiple lower battery cells includes a main positive output electrode and a main negative output electrode; the positive electrode of the upper heating film and the positive electrode of the lower heating film are both connected to the main positive output electrode, and the negative electrode of the upper heating film and the negative electrode of the lower heating film are both connected to the main negative output electrode; the controller can control the upper heating film and the lower heating film to open or close.

[0010] In any of the above technical solutions, further, the battery box also includes a battery management system, and the controller is a pulse controller; the negative electrode of the upper heating film and the negative electrode of the lower heating film are both connected to the main negative output electrode through the pulse controller; the battery management system is communicatively connected with the pulse controller, and the pulse controller can control the upper heating film and the lower heating film to open or close according to the instructions of the battery management system.

[0011] According to a second aspect of the present application, a vehicle battery temperature control system is provided, comprising the battery box as described above.

[0012] In any of the above technical solutions, further, the automotive battery temperature control system also includes a water pump and a water pump controller, and the water pump controller can control the water pump to start according to the instructions of the battery management system, so that the circulating water enters the liquid cooling plate through the water inlet pipe and flows out from the water outlet pipe.

[0013] In any of the above technical solutions, further, the battery management system pre-stores a predetermined value for heating; when the battery box is charging, when the temperature of the battery module is less than or equal to the predetermined value for heating, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper heating film and the lower heating film to turn on; and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on.

[0014] In any of the above technical solutions, further, the battery management system pre-stores a first-level water inlet temperature preset value, a second-level water inlet temperature preset value, and a stable heating preset value; wherein, the second-level water inlet temperature preset value is greater than the first-level water inlet temperature preset value; when the water pump, the upper heating film, and the lower heating film are all turned on, if the water inlet temperature is greater than or equal to the second-level water inlet temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn off; if the water inlet temperature is less than or equal to the first-level water inlet temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on; when the water pump, the upper heating film, and the lower heating film are all turned on, if the temperature of the battery module is greater than or equal to the stable heating preset value, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper heating film and the lower heating film to turn off; and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn off.

[0015] In any of the above technical solutions, further, the automobile battery temperature control system also includes a water inlet temperature sensor and multiple battery temperature sensors; the multiple battery temperature sensors are distributed in multiple areas of the battery module to obtain battery temperature values ​​in multiple areas, and the battery management system uses the minimum battery temperature value among the battery temperature values ​​in multiple areas as the temperature value of the battery module; the water inlet temperature sensor can obtain the water inlet temperature.

[0016] The battery box of the present application comprises a box body, an upper heating film, a lower heating film, a plurality of upper battery cells and a plurality of lower battery cells. The box body has a thickness direction, and the box body comprises a partition and an upper tank body and a lower tank body arranged along the thickness direction separated by the partition; a plurality of upper battery cells are arranged in the upper tank body, and a plurality of lower battery cells are arranged in the lower tank body, and the thickness direction of the upper battery cells and the thickness direction of the lower battery cells are both parallel to the thickness direction of the box body; the upper heating film is attached to the upper surface of the plurality of upper battery cells, and the lower heating film is attached to the lower surface of the plurality of lower battery cells.

[0017] According to the above technical features, the beneficial effects of this application are:

[0018] The battery module of the present application includes two parts (multiple upper battery cells and multiple lower battery cells), and the multiple upper battery cells and the multiple lower battery cells are heated and heated by the upper heating film and the lower heating film respectively, and the upper battery cells and the lower battery cells are both in large surface contact with the bonding heating film. In this way, each heating film heats and heats part of the battery cells, so that the heating efficiency is higher and the heating is more balanced; further, each membrane contacts the large surface of the bonding battery cell, so that the heating efficiency is higher, the battery cell heats up faster, and the heat transfer direction is along the thickness direction of the battery cell, so that because the size of each battery cell in the thickness direction is small, the heat transfer speed can be further improved, and the heating efficiency can be further improved.

[0019] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram showing an exploded structure of a battery box according to an embodiment of the present application is shown;

[0022] Figure 2 A schematic structural diagram of a box body according to an embodiment of the present application is shown;

[0023] Figure 3 A schematic structural diagram of an upper heating film according to an embodiment of the present application is shown;

[0024] Figure 4 A schematic structural diagram of an upper layer heating and heat preservation structure according to an embodiment of the present application is shown;

[0025] Figure 5 A wiring diagram of a battery box according to an embodiment of the present application is shown.

[0026] Icons: 1-upper cover; 2-upper heating and insulation structure; 201-upper elastic insulation structure; 202-upper heating film; 203-positive electrode; 204-negative electrode; 3-upper battery cell; 4-box body; 401-liquid cooling plate; 402-frame; 403-longitudinal beam; 404-water inlet pipe; 405-water outlet pipe; 5-lower battery cell; 6-lower heating and insulation structure; 7-lower cover; 8-battery management system; 9-pulse controller; 10-main positive output electrode; 11-main negative output electrode; 12-end plate; 100-battery module; X-length direction; Y-width direction; Z-thickness direction. DETAILED DESCRIPTION

[0027] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0028] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0029] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0030] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0031] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0032] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0033] The terms used herein are only used to describe various examples and are not used to limit the present disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprise" and "have" list the stated features, quantities, operations, components, elements and / or their combinations that exist, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0034] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0035] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0036] At present, with the increasing demand for fast charging of new energy vehicles, the safety of power batteries cannot be ignored. For example, fast charging of power batteries in low temperature environments may cause lithium deposition in the batteries, which in turn may lead to safety risks. Therefore, it is particularly important to design a battery pack that can be heated quickly. Before this application was filed, the existing method of fast heating of battery packs was to heat the sides of the battery packs by passing hot water through a liquid cooling plate, but the above heating method had low heating efficiency.

[0037] In view of this, the first aspect of the present application provides a battery case, thereby solving the problem of low heating efficiency of the existing battery pack rapid heating method.

[0038] Refer to the following Figures 1 to 5 The battery box according to some embodiments of the present application is described. For the convenience of description, the length direction X, thickness direction Z and width direction Y of the box body 4 are first defined. Figure 1 As shown, X shown in the figure may be an example of the length direction X, Y shown in the figure may be an example of the width direction Y, and Z shown in the figure may be an example of the thickness direction Z, wherein the length direction X, the width direction Y and the thickness direction Z are perpendicular to each other.

[0039] like Figure 1 As shown, the battery box of the present application includes a box body 4, an upper heating film 202 (see Figure 3 and Figure 4 ), a lower heating film, a plurality of upper battery cells 3 and a plurality of lower battery cells 5. The box body 4 includes a partition and an upper tank body and a lower tank body arranged along the thickness direction Z separated by the partition (see Figure 2 ); multiple upper battery cells 3 are arranged in the upper trough body, and multiple lower battery cells 5 are arranged in the lower trough body. The thickness direction Z of the upper battery cells 3 and the thickness direction Z of the lower battery cells 5 are both parallel to the thickness direction Z of the box body 4; the upper heating film 202 is attached to the upper surfaces of the multiple upper battery cells 3, and the lower heating film is attached to the lower surfaces of the multiple lower battery cells 5.

[0040] The battery module 100 of the present application includes two parts (a plurality of upper battery cells 3 and a plurality of lower battery cells 5), and the plurality of upper battery cells 3 and the plurality of lower battery cells 5 are heated and heated by the upper heating film 202 and the lower heating film respectively, and the upper battery cells 3 and the lower battery cells 5 are both large-surface contact-bonded heating films. In this way, each heating film heats and heats a portion of the battery cells, so that the heating efficiency is higher and the heating is more balanced; further, each membrane sheet contacts the large surface of the bonded battery cell, so that the heating efficiency is higher, the battery cell heats up faster, and the heat transfer direction is along the thickness direction Z of the battery cell, so that because the size of each battery cell in the thickness direction Z is small, the heat transfer speed can be further improved, and the heating efficiency can be further improved.

[0041] In the embodiments of the present application, Figure 2 As shown, the box body 4 also includes a frame 402, and the partition is a liquid cooling plate 401; the liquid cooling plate 401 is connected to the inside of the frame 402 to form an upper tank body and a lower tank body with the frame 402; the battery box body also includes a water inlet pipe 404 and a water outlet pipe 405, and the water inlet pipe 404 and the water outlet pipe 405 are both connected to the liquid cooling plate 401 through the frame 402. External circulating water can enter the liquid cooling plate 401 through the water inlet pipe 404 and then flow out through the water outlet pipe 405. It should be noted here that the external circulating water can be hot water or cold water.

[0042] When the battery pack needs to be heated quickly, the liquid cooling plate 401 can pass hot water and work with the heating film to heat the battery cells. The specific heating logic is described in detail below.

[0043] The liquid cooling plate 401 of the present application contacts the bottom of the upper battery cell 3 and the top of the lower battery cell 5 at the same time, and both are in large-area contact. When heating is required, the top and bottom of the battery cell are heated at the same time, thereby further improving the heating efficiency.

[0044] When the battery pack needs to be cooled, cold water can be passed through the liquid cooling plate 401. The liquid cooling plate 401 of the present application is arranged at the central position in the height direction of the battery box frame 402. The large surface of the battery cell is in close contact with the water cooling plate, which increases the heat dissipation area of ​​the battery cell to meet the cooling needs. When thermal runaway occurs, it can also prevent heat from being transferred to other battery cells through the large surface of the battery cell, further reducing the risk of thermal runaway in other battery cells.

[0045] In the embodiments of the present application, Figure 2 As shown, the box body 4 also includes a plurality of upper longitudinal beams 403 and a plurality of lower longitudinal beams 403. Among them, the plurality of upper longitudinal beams 403 are all connected to the frame 402 and extend along the length direction X; the plurality of upper longitudinal beams 403 are all arranged in the upper tank body to divide the plurality of upper battery cells 3 into a plurality of groups. Similarly, the plurality of lower longitudinal beams 403 are all connected to the frame 402 and extend along the length direction X; the plurality of lower longitudinal beams 403 are all arranged in the lower tank body to divide the plurality of lower battery cells 5 into a plurality of groups. Figure 1 As shown, each group of upper battery cells 3 and each group of lower battery cells 5 are provided with end plates 12. Thus, the multiple upper longitudinal beams 403 and multiple lower longitudinal beams 403 of the present application are arranged between the battery cells and connected to the frame 402, which can enhance the structural strength of the entire battery box.

[0046] In the embodiments of the present application, Figure 1 As shown, the battery box also includes an upper cover 1, an upper elastic insulation structure 201, a lower cover 7 and a lower elastic insulation structure. The upper elastic insulation structure 201 is squeezed between the upper cover 1 and the upper heating film 202 (combined with Figure 4); the lower elastic insulation structure is squeezed between the lower cover 7 and the lower heating film.

[0047] Specifically, Figure 3 and Figure 4 As shown, the upper elastic insulation structure 201 and the upper heating film 202 of the present application form an upper heating insulation structure 2 (integrated structure), and the lower elastic insulation structure and the lower heating film form a lower heating insulation structure 6 (integrated structure, see Figure 1 ), the upper elastic thermal insulation structure 201 and the lower elastic thermal insulation structure are made of aerogel material with certain gaps, which has certain compressibility. The upper elastic thermal insulation structure 201 ensures that the upper heating film 202 can fit tightly with the upper battery cell 3 under the pressure of the upper cover 1 to ensure the heating effect; similarly, the lower elastic thermal insulation structure ensures that the lower heating film can fit tightly with the lower battery cell 5 under the pressure of the lower cover 7 to ensure the heating effect.

[0048] In this embodiment, Figure 3 As shown, the upper heating film 202 includes a positive electrode 203 and a negative electrode 204, the lower heating film includes a positive electrode and a negative electrode, and there are resistance wires inside the upper heating film 202 and the lower heating film, which can heat the battery cell after being energized.

[0049] In the embodiments of the present application, Figure 1 As shown, the battery module 100 composed of a plurality of upper battery cells 3 and a plurality of lower battery cells 5 includes a main positive output electrode 10 and a main negative output electrode 11 .

[0050] like Figure 5 As shown ( Figure 5 It only illustrates the connection method between the upper heating film 202 and the battery module 100), the positive electrode 203 of the upper heating film 202 and the positive electrode of the lower heating film are both connected to the main positive output electrode 10, and the negative electrode 204 of the upper heating film 202 and the negative electrode of the lower heating film are both connected to the main negative output electrode 11, so as to supply power to the upper heating film 202 and the lower heating film through the battery module 100.

[0051] Furthermore, the battery box also includes a controller, which can control the upper heating film 202 and the lower heating film to be turned on or off. Figure 5 As shown, the battery box also includes a battery management system 8, and the controller is a pulse controller 9. The negative electrode 204 of the upper heating film 202 and the negative electrode 204 of the lower heating film are both connected to the main negative output electrode 11 through the pulse controller 9; the battery management system 8 is connected to the pulse controller 9 for communication, and the pulse controller 9 can control the upper heating film 202 and the lower heating film to turn on or off according to the instructions of the battery management system 8.

[0052] The high and low voltage topology is shown in Figure 5. In terms of high voltage, the positive electrode 203 of the upper heating film 202 and the positive electrode of the lower heating film are connected to the main positive output electrode 10 of the battery module 100, and the negative electrode 204 of the upper heating film 202 and the negative electrode of the lower heating film are connected to the pulse controller 9, and then the pulse controller 9 is connected to the main negative output electrode 11 of the battery module 100. In terms of low voltage connection, the battery management system 8 is connected to the pulse controller 9, and the function of the pulse controller 9 is to control the power of the heating film through the duty cycle.

[0053] A second aspect of the present application provides an automotive battery temperature control system, comprising the battery box as described above.

[0054] The automobile battery temperature control system also includes a water pump and a water pump controller. The water pump controller can control the water pump to start according to the instructions of the battery management system 8, so that the circulating water enters the liquid cooling plate 401 through the water inlet pipe 404 and flows out through the water outlet pipe 405.

[0055] The following is a description of the logic process of battery module charging and heating:

[0056] The battery management system pre-stores a preset value for heating, a preset value for the first-level water inlet temperature, a preset value for the second-level water inlet temperature, and a preset value for stable heating; wherein the preset value for the second-level water inlet temperature is greater than the preset value for the first-level water inlet temperature.

[0057] When the battery box is charging, determine whether the charging and heating entry conditions are met:

[0058] When the temperature of the battery module is less than or equal to the preset value for heating, the charging and heating entry conditions are met. At this time, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper and lower heating films to turn on (the battery management system controls the duty cycle of the pulse controller and the power of the heating film); and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on. That is, when Tb_min (the lowest temperature of the battery module 100) ≤ Tb_min_heat (the preset value for heating), the upper heating film, the lower heating film, and the water pump are turned on.

[0059] When the battery box is charging, after the upper heating film, lower heating film and water pump are turned on, determine whether the charging and heating entry conditions are met:

[0060] Case 1: When the water pump, the upper heating film and the lower heating film are all turned on, if the inlet water temperature is less than or equal to the first-level inlet water temperature preset value, the water pump controller continues to control the water pump to turn on. That is, when Tb_inlet (inlet water temperature) ≤ T_max_inlet (first-level inlet water temperature preset value), the water pump controller continues to control the water pump to turn on.

[0061] Case 2: When the water pump, upper heating film and lower heating film are all turned on, if the inlet water temperature is greater than or equal to the second-level inlet water temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn off. Afterwards, if the inlet water temperature is less than or equal to the first-level inlet water temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on.

[0062] That is, when Tb_inlet (water inlet temperature) ≥ T_max_inlet + 2°C (secondary water inlet temperature preset value), the water pump controller controls the water pump to turn off. Afterwards, if Tb_inlet (water inlet temperature) ≤ T_max_inlet (primary water inlet temperature preset value), the water pump controller controls the water pump to turn on.

[0063] Case 3: When the water pump, upper heating film and lower heating film are all turned on, if the temperature of the battery module is greater than or equal to the preset value for stable heating, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper heating film and the lower heating film to be turned off; and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to be turned off. That is, when Tb_min (the lowest temperature of the battery module) ≥ Tb_min_heat_t (the preset value for stable heating), the water pump, upper heating film and lower heating film are turned off.

[0064] In this embodiment, Tb_min_heat (preset value for heating required) can be selected as -5°C; Tb_min_heat_t (preset value for stable heating) can be selected as 15°C; T_max_inlet (preset value for first-level inlet water temperature) can be selected as 55°C; T_max_inlet+2°C (preset value for second-level inlet water temperature) can be selected as 57°C.

[0065] It should be noted here that when Tb_inlet (water inlet temperature) ≥ T_max_inlet + 2°C (predetermined value of the secondary water inlet temperature), the water pump controller controls the water pump to shut down to prevent the battery module from being damaged by excessive water temperature.

[0066] In this embodiment, the automobile battery temperature control system also includes a water inlet temperature sensor and multiple battery temperature sensors. Among them, the multiple battery temperature sensors are distributed in multiple areas of the battery module to obtain the battery temperature values ​​of the multiple areas, and the battery management system uses the minimum battery temperature value among the battery temperature values ​​of the multiple areas as the temperature value of the battery module. That is, the battery management system uses the minimum battery temperature value among the battery temperature values ​​of the multiple areas as the temperature value Tb_min (the minimum temperature of the battery module) of the battery module. The water inlet temperature sensor can be set in the water inlet pipe to obtain the water inlet temperature Tb_inlet.

[0067] In this application, (1) a system is designed that can heat the large surface of a battery cell to meet the heating requirements of low-temperature fast charging.

[0068] (2) An integrated heating system is designed to combine the functions of battery cell heating and heat preservation, thereby improving the heating efficiency and further improving the low-temperature performance of the battery.

[0069] (3) A heating system layout was designed to increase the volume grouping rate of the battery pack.

[0070] (4) A large-surface cooling method for power batteries was designed, which can meet the needs of fast charging and cooling at room temperature.

[0071] In addition, this application also includes a driving preheating mode:

[0072] When the user's navigation destination is a charging station, the following conditions are judged. If all conditions are met, a pop-up window will prompt whether to start the on-the-way heating. When the user manually selects "Yes", the following conditions are judged:

[0073] If the remaining driving range is ≥ the distance between the current navigation position and the target charging pile; and the current remaining power is > 20-30%; and the current minimum temperature of the battery module is ≤-5℃, the water pump, upper heating film and lower heating film are turned on.

[0074] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that any technician familiar with this technical field can still modify the technical solutions recorded in the aforementioned embodiments within the technical scope disclosed in the present application, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be covered by the protection scope of the present application.

Claims

1. A battery box, characterized in that: The battery box comprises a box body, an upper heating film, a lower heating film, a plurality of upper battery cells and a plurality of lower battery cells; The box body has a thickness direction, and the box body includes a partition and an upper tank body and a lower tank body separated by the partition and arranged along the thickness direction; The plurality of upper battery cells are arranged in the upper tank body, the plurality of lower battery cells are arranged in the lower tank body, and the thickness direction of the upper battery cells and the thickness direction of the lower battery cells are both parallel to the thickness direction of the box body; The upper heating film is attached to the upper surfaces of the plurality of upper battery cells, and the lower heating film is attached to the lower surfaces of the plurality of lower battery cells.

2. The battery box according to claim 1, characterized in that: The box body also includes a frame, and the partition is a liquid cooling plate; The liquid cooling plate is connected to the inside of the frame to form the upper tank body and the lower tank body with the frame; The battery box also includes a water inlet pipe and a water outlet pipe, and both the water inlet pipe and the water outlet pipe pass through the frame and are connected to the liquid cooling plate.

3. The battery box according to claim 2, characterized in that: The box body further comprises a plurality of upper longitudinal beams and a plurality of lower longitudinal beams, and the box body has a length direction perpendicular to the thickness direction; The plurality of upper longitudinal beams are all connected to the frame and extend along the length direction; the plurality of upper longitudinal beams are all arranged on the upper tank body to divide the plurality of upper battery cells into a plurality of groups; The multiple lower longitudinal beams are all connected to the frame and extend along the length direction; the multiple lower longitudinal beams are all arranged in the lower layer trough body to divide the multiple lower layer battery cells into multiple groups.

4. The battery box according to claim 2, characterized in that: The battery box also includes an upper cover, an upper elastic heat-insulating structure, a lower cover and a lower elastic heat-insulating structure; The upper elastic heat-insulating structure is squeezed between the upper cover and the upper heating film; The lower elastic heat-insulating structure is squeezed between the lower cover and the lower heating film.

5. The battery case according to any one of claims 2 to 4, characterized in that: The battery box also includes a controller; The battery module composed of the plurality of upper battery cells and the plurality of lower battery cells includes a main positive output electrode and a main negative output electrode; The positive electrode of the upper heating film and the positive electrode of the lower heating film are both connected to the main positive output electrode, and the negative electrode of the upper heating film and the negative electrode of the lower heating film are both connected to the main negative output electrode; The controller can control the upper heating film and the lower heating film to turn on or off.

6. The battery box according to claim 5, characterized in that: The battery box also includes a battery management system, and the controller is a pulse controller; The negative electrode of the upper heating film and the negative electrode of the lower heating film are both connected to the main negative output electrode through the pulse controller; The battery management system is in communication connection with the pulse controller, and the pulse controller can control the upper heating film and the lower heating film to turn on or off according to the instruction of the battery management system.

7. An automotive battery temperature control system, characterized in that: A battery box comprising the battery box according to claim 6; The automobile battery temperature control system also includes a water pump and a water pump controller. The water pump controller can control the water pump to start according to the instructions of the battery management system, so that circulating water enters the liquid cooling plate through the water inlet pipe and flows out through the water outlet pipe.

8. The automotive battery temperature control system according to claim 7, characterized in that: The battery management system pre-stores a predetermined value for heating; When the battery box is charging, when the temperature of the battery module is less than or equal to the predetermined value requiring heating, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper heating film and the lower heating film to turn on; and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on.

9. The automotive battery temperature control system according to claim 8, characterized in that: The battery management system pre-stores a first-level water inlet temperature preset value, a second-level water inlet temperature preset value, and a stable heating preset value; wherein the second-level water inlet temperature preset value is greater than the first-level water inlet temperature preset value; When the water pump, the upper heating film and the lower heating film are all turned on, if the inlet water temperature is greater than or equal to the secondary inlet water temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn off; if the inlet water temperature is less than or equal to the primary inlet water temperature preset value, the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn on; When the water pump, the upper heating film and the lower heating film are all turned on, if the temperature of the battery module is greater than or equal to the predetermined stable heating value, the battery management system sends a signal to the pulse controller, and the pulse controller controls the upper heating film and the lower heating film to turn off; and the battery management system sends a signal to the water pump controller, and the water pump controller controls the water pump to turn off.

10. The automotive battery temperature control system according to claim 9, characterized in that: The automobile battery temperature control system also includes a water inlet temperature sensor and a plurality of battery temperature sensors; The multiple battery temperature sensors are distributed in multiple areas of the battery module to obtain battery temperature values ​​of the multiple areas, and the battery management system uses the smallest battery temperature value among the battery temperature values ​​of the multiple areas as the temperature value of the battery module; The inlet water temperature sensor can obtain the inlet water temperature.

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