Heating film control device and battery pack

Abstract

The invention provides a heating film control device and a battery pack, the heating film control device comprises a relay, the relay comprises a shell and an inner core, the shell comprises a first top plate and four first side plates so as to form a first cavity, the inner core is arranged in the first cavity, the wiring end of the inner core extends out from the bottom far away from the first top plate, and the wiring end of the inner core extends out from the bottom far away from the first top plate; the wiring terminal comprises a first wiring terminal and a second wiring terminal used for being connected with a heating film; a fuse; the mounting table is arranged on the peripheral side of the target first side plate of the shell, a fuse is fixed on the mounting table, a first contact is formed at the first end of the mounting table, the first contact is connected with the first end of the fuse, a second contact is formed at the second end of the mounting table, and the second contact is connected with the second end of the fuse; and the first end of the connecting bar is connected with the first contact, and the second end of the connecting bar is connected with the first wiring end. According to the heating film control device, the space occupied by the controller in the battery pack is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle battery packs, and in particular to a heating film control device and a battery pack. Background Art

[0002] Lithium-ion batteries have been widely used in new energy vehicles due to their advantages, including high energy consumption, high battery voltage, wide operating temperature range, and long storage life. However, performance degradation and low-temperature charging safety issues have gradually emerged, becoming a major concern for users of new energy vehicles. Therefore, it is necessary to design a reasonable thermal management method to heat the battery system at low temperatures and ensure that the battery system can charge and discharge at the most suitable temperature. Currently, the most common battery system heating method used by various vehicle manufacturers is to use heating film, which is generally placed on the bottom and sides of the battery cell.

[0003] The heating film needs to be connected to a controller to control the on and off of the heating circuit. Traditional controllers arrange relays, fuses, etc. separately, taking up space in the battery pack. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a heating film control device and a battery pack, aiming to overcome at least one of the above-mentioned defects.

[0005] In the first aspect, the present application provides a heating film control device, which includes: a relay, the relay including a shell and an inner core, the shell including a first top plate and four first side plates to form a first cavity, the inner core is arranged in the first cavity, and the terminal of the inner core extends from the bottom away from the first top plate, the terminal including a first terminal and a second terminal for connecting to the heating film; a fuse; a mounting platform, the mounting platform is arranged on the peripheral side of the target first side plate of the shell, the fuse is fixed on the mounting platform, a first contact is formed at the first end of the mounting platform, the first contact is connected to the first end of the fuse, and a second contact is formed at the second end of the mounting platform, the second contact is connected to the second end of the fuse; a connecting row, the first end of the connecting row is connected to the first contact, and the second end of the connecting row is connected to the first terminal.

[0006] In one possible embodiment, the connecting row includes a first horizontal portion, a vertical portion and a second horizontal portion, the upper surface of the first horizontal portion is connected to the first terminal of the inner core, so that the first side of the vertical portion is tightly fitted with the target first side panel, and the lower surface of the second horizontal portion is connected to the upper surface of the mounting platform close to one end of the inner core, so that the second side of the vertical portion is tightly fitted with the end of the mounting platform close to the inner core.

[0007] In a possible implementation, the heating film control device further includes: a thermal pad, which is provided on a lower surface of the first horizontal portion and is used to conduct heat from the inner core.

[0008] In a possible embodiment, the heating film control device also includes: an outer shell, the outer shell includes a second top plate and four second side plates to form a second cavity, the shell is arranged in the second cavity, the outer wall of the first top plate is fixedly connected to the inner wall of the second top plate, and a notch is formed on a second side plate of the four second side plates close to the connecting row, and the width of the notch is the same as the width of the vertical portion.

[0009] In a possible embodiment, a mounting hole is formed on one end of the mounting platform away from the thermal pad, wherein the heating film control device further comprises: a mounting pad, which is fixed to the bottom of the mounting platform through the mounting hole so that the bottom of the mounting pad and the bottom of the thermal pad are in the same plane.

[0010] In the second aspect, the present application provides a battery pack, which includes: a liquid cooling plate; a heating film, wherein the first surface of the heating film is bonded to the first side of the liquid cooling plate by a thermally conductive structural adhesive, and the second surface of the heating film is used to bond to the surface of the battery cell by a thermally conductive structural adhesive, and the first surface is opposite to the second surface; a heating film control device as described in the first aspect, wherein the heating film control device includes a mounting pad, a thermally conductive pad and a relay, the mounting pad is fixed to the second side of the liquid cooling plate, the thermally conductive pad is in close contact with the liquid cooling plate to transfer the heat of the relay to the liquid cooling plate through the thermally conductive pad, and the relay is connected to the heating film.

[0011] In a possible embodiment, the battery pack further includes: a detection unit, which is arranged on the side of the battery cell and is used to detect the operating parameters of the battery cell; a battery control unit, a first end of the battery control unit is connected to the relay, and a second end of the battery control unit is connected to the detection unit, and the battery control unit is used to control the connection or disconnection of the relay according to the operating parameters.

[0012] In one possible embodiment, the operating parameters include a leakage current value and a battery cell temperature value, wherein when the battery control unit detects that the leakage current value is greater than the corresponding warning threshold, and / or when the battery cell temperature value is greater than the corresponding warning threshold, the battery control unit controls the relay to disconnect so that the heating film stops working.

[0013] In a possible embodiment, the battery pack further includes: a battery pack disconnecting unit, which is arranged on the second side of the liquid cooling plate and adjacent to the heating film control device, and the battery pack disconnecting unit is electrically connected to the second contact on the mounting platform of the heating film control device.

[0014] In a possible embodiment, the heating film includes a first heating film and a second heating film, the first heating film is laid on the side of the liquid cooling plate close to the heating film control device, and the second heating film is laid on the side of the liquid cooling plate close to the battery pack disconnect unit.

[0015] The beneficial effects of the heating film control device of the present application are as follows: The present application reduces the space occupied by the heating film control device in the battery pack by integrating relays and fuses.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 This is one of the structural schematic diagrams of the heating film control device provided in an embodiment of the present application; Figure 2 This is the second structural diagram of the heating film control device provided in the embodiment of the present application; Figure 3 A schematic diagram of the structure of the battery pack provided in an embodiment of the present application.

[0019] Figure numerals: 100 - heating film control device; 101 - relay; 102 - fuse; 103 - mounting platform; 104 - connecting bar; 105 - thermal pad; 106 - outer shell; 107 - mounting pad; 201 - liquid cooling plate; 202 - first heating film; 203 - second heating film; 300 - detection unit; 301 - battery control unit; 302 - battery pack disconnect unit. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work falls within the scope of protection of the present application.

[0021] First, the application scenarios to which this application is applicable are introduced. This application can be applied to vehicle battery packs.

[0022] Research has found that while lithium-ion batteries, with their high energy density and wide temperature range, have become a core power source for new energy vehicles, they suffer from increasingly prominent low-temperature performance degradation and charging safety risks, severely restricting user experience. The current mainstream solution uses a heating film to heat the bottom and sides of the battery cell, but two major technical bottlenecks remain: 1. Thermally conductive structural adhesive must be filled between the heating film and the battery cell to transfer heat. After curing, the adhesive hardens and can easily pierce the insulation layer, leading to leakage or even thermal runaway. 2. Traditional controllers place relays, fuses, and other components separately, occupying space in the battery pack.

[0023] Based on this, an embodiment of the present application provides a heating film control device and a battery pack, which can reduce the space occupied by the controller in the battery pack, and by removing the bottom outer shell of the relay, the relay can borrow the cooling effect of the battery pack liquid cold plate through the heat dissipation pad, thereby enhancing the heat dissipation capacity of the relay.

[0024] Example 1: See also Figure 1 and Figure 2 , Figure 1 This is one of the structural diagrams of the heating film control device provided in the embodiment of the present application. Figure 2 This is the second structural diagram of the heating film control device provided in an embodiment of the present application. The heating film control device of the present application includes: a relay 101, a fuse 102, a mounting platform 103 and a connecting bar 104.

[0025] Specifically, the relay 101 includes a shell and an inner core, the shell includes a first top plate and four first side plates to form a first cavity, the inner core is arranged in the first cavity, and the terminal of the inner core extends from the bottom away from the first top plate, and the terminal includes a first terminal and a second terminal for connecting to the heating film.

[0026] The mounting platform 103 is arranged on the peripheral side of the target first side plate of the shell, and the fuse 102 is fixed on the mounting platform 103. A first contact is formed at the first end of the mounting platform 103, and the first contact is connected to the first end of the fuse 102. A second contact is formed at the second end of the mounting platform 103, and the second contact is connected to the second end of the fuse 102.

[0027] The first end of the connecting row 104 is connected to the first contact, and the second end of the connecting row 104 is connected to the first terminal. The connecting row 104 includes a first horizontal portion, a vertical portion and a second horizontal portion. The upper surface of the first horizontal portion is connected to the first terminal of the inner core, so that the first side of the vertical portion is tightly fitted with the target first side plate, and the lower surface of the second horizontal portion is connected to the upper surface of the mounting platform 103 close to one end of the inner core, so that the second side of the vertical portion is tightly fitted with one end of the mounting platform 103 close to the inner core.

[0028] As an example, the material of the connecting bar 104 includes, but is not limited to, copper, aluminum, and various conductive metals and alloys thereof.

[0029] like Figure 2 As shown, the heating film control device 100 of the present application further includes: a thermal pad 105 , an outer shell 106 and a mounting pad 107 .

[0030] The thermal pad 105 is disposed on the lower surface of the first horizontal portion for conducting heat from the inner core.

[0031] As an example, the thermal pad 105 may be made of a material with good ductility and high thermal conductivity, including but not limited to silicone rubber.

[0032] The outer shell 106 includes a second top plate and four second side plates to form a second cavity. The shell is arranged in the second cavity. The outer wall of the first top plate is fixedly connected to the inner wall of the second top plate. A notch is formed on a second side plate among the four second side plates close to the connecting row 104. The width of the notch is the same as the width of the vertical portion.

[0033] In addition, the lengths of the four second side plates enable the thermal pad 105 to be exposed outside the housing, thereby achieving better heat dissipation.

[0034] The mounting pad 107 is fixed to the bottom of the mounting platform 103 through a mounting hole formed on one end of the mounting platform 103 away from the thermal pad 105 so that the bottom of the mounting pad 107 and the bottom of the thermal pad 105 are in the same plane.

[0035] Example 2: See also Figure 3 , Figure 3This is a structural schematic diagram of the battery pack provided in an embodiment of the present application. The battery pack of the present application includes: a liquid cooling plate 201, a heating film, a heating film control device 100 as in Example 1, a detection unit 300, a battery control unit 301 and a battery pack disconnect unit 302.

[0036] Here, the mounting pad 107 of the heating film control device 100 is fixed on the second side of the liquid cooling plate 201, and the thermal conductive pad 105 of the heating film control device 100 is in close contact with the liquid cooling plate 201, so that it can use the cooling effect of the liquid cooling plate 201 to cool the relay 101, so that the relay 101 can obtain good heat dissipation when working for a long time. The relay 101 is connected to the heating film. When the heat dissipation is good, the relay 101 can choose a lower specification model to reduce costs.

[0037] When the heating film control device 100 is working, the relay 101 is energized for a long time, and the high-voltage circuit will have a continuous current. The connection between the relay 101 and the connecting bar 104 will continuously generate heat under the thermal effect of the current. The connecting bar 104 is made of copper and has good thermal conductivity. The connecting bar 104 transfers heat to the liquid cooling plate 201 through the thermal pad 105, thereby reducing the temperature of the relay 101 and the connecting bar 104.

[0038] The first surface of the heating film is bonded to the first side of the liquid cooling plate 201 through thermal conductive structural adhesive, and the second surface of the heating film is used to bond to the surface of the battery cell through thermal conductive structural adhesive. The first surface and the second surface are opposite to each other. After the thermal conductive structural adhesive is cured, the heating film and the battery cell can be fixed in the battery system. At the same time, it can also transfer heat to make the temperature of the battery system more uniform, and also improve the accuracy of the detection unit 300 in detecting the operating parameters of the battery cell.

[0039] Among them, the heating film includes a first heating film 202 and a second heating film 203. The first heating film 202 is laid on the side of the liquid cooling plate 201 close to the heating film control device 100, and the first heating film 202 is laid on the side of the liquid cooling plate 201 close to the battery pack disconnect unit 302.

[0040] The detection unit 300 is disposed on a side surface of the battery cell and is used to detect operating parameters of the battery cell.

[0041] A first end of the battery control unit 301 is connected to the relay 101 through a low-voltage wire harness, and a second end of the battery control unit 301 is connected to the detection unit 300 through a low-voltage wire harness.

[0042] Here, the operating parameters include leakage current value and battery cell temperature value. The detection module adopts highly sensitive temperature sensing materials and specific packaging structure, which can accurately obtain the battery cell temperature value on the battery cell surface and stably transmit the battery cell temperature value in the form of resistance value to the battery control unit 301. There is a specific functional relationship between the battery cell temperature value and the resistance value. The battery control unit 301 can calculate the specific battery cell temperature value from the resistance value through a preset functional relationship. The detection module can also adopt a specific current detection algorithm and circuit design, which can accurately sense the extremely small leakage current value on the battery cell surface and convert it into a transmittable electrical signal. The combination of this structural setting of the detection function and the detection method can effectively prevent the leakage current and insulation failure problems caused by the heating film being punctured by the thermal conductive structural glue or other foreign objects.

[0043] Here, the detection module can detect whether there is leakage current on the surface of the battery cell, that is, the leakage current value, and send the detected leakage current value to the battery control unit 301 through the low-voltage wiring harness, so that the battery control unit 301 controls the relay 101 to be closed or disconnected according to the leakage current value and the battery cell temperature value. When the battery control unit 301 detects that the leakage current value is greater than the corresponding warning threshold, the battery control unit 301 transmits a control signal and controls the relay 101 to be disconnected through the low-voltage wiring harness, so that the heating film stops working, and at the same time reports the fault to the entire vehicle to remind the owner in time.

[0044] In addition, the detection module also transmits the collected battery cell temperature value to the battery control unit 301 through the low-voltage wiring harness. The battery control unit 301 determines whether the real-time battery cell temperature value is lower than the warning threshold value. If it does not exceed the threshold, the battery control unit 301 controls the relay 101 to be energized through the low-voltage wiring harness, and the heating film control device 100 starts to work and generate heat. The battery system temperature rises, and the battery control unit 301 continues to collect the battery cell temperature value in real time. If it exceeds the threshold, the battery control unit 301 controls the relay 101 to be disconnected through the low-voltage wiring harness, and the heating film control device 100 stops working, so that the heating film stops working. At the same time, the fault is reported to the entire vehicle to remind the owner in time.

[0045] The battery pack disconnect unit 302 is disposed on the second side of the liquid cooling plate 201 and adjacent to the heating film control device 100 . The battery pack disconnect unit 302 is electrically connected to a second contact on the mounting platform 103 of the heating film control device 100 through a high-voltage wire harness.

[0046] Compared with the prior art, the heating film control device provided in the embodiment of the present application reduces the space occupied by the controller in the battery pack by integrating relays, fuses, and wiring harnesses. By removing the bottom outer shell of the relay, the relay can borrow the cooling effect of the battery pack liquid cold plate through the heat dissipation pad, thereby enhancing the heat dissipation capacity of the relay, achieving the effect of relay downshift selection and reducing costs.

[0047] In addition, the heating film of the battery pack of the present application can be tested for insulation by a detection unit to prevent the heating film from being punctured by thermally conductive structural adhesive or other foreign objects, resulting in leakage current and insulation failure, and a heating strategy can be formulated based on the obtained battery cell temperature value.

[0048] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0049] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0050] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0051] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0052] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program code, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0053] 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 scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-mentioned embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A heating film control device, characterized in that: The heating film control device includes: A relay comprising a housing and an inner core, wherein the housing comprises a first top plate and four first side plates to form a first cavity, the inner core being disposed within the first cavity, a terminal of the inner core extending from a bottom away from the first top plate, the terminal comprising a first terminal and a second terminal for connecting to a heating film; fuse; a mounting platform, the mounting platform being disposed on a peripheral side of the target first side plate of the housing, the fuse being fixed on the mounting platform, a first contact being formed at a first end of the mounting platform, the first contact being connected to the first end of the fuse, and a second contact being formed at a second end of the mounting platform, the second contact being connected to the second end of the fuse; A connecting bar, wherein a first end of the connecting bar is connected to the first contact point, and a second end of the connecting bar is connected to the first terminal.

2. The heating film control device according to claim 1, characterized in that: The connecting row includes a first horizontal portion, a vertical portion, and a second horizontal portion, The upper surface of the first horizontal portion is connected to the first terminal of the inner core, so that the first side of the vertical portion is closely fitted to the target first side plate. The lower surface of the second horizontal portion is connected to the upper surface of the mounting platform close to the inner core, so that the second side of the vertical portion is tightly fitted to the end of the mounting platform close to the inner core.

3. The heating film control device according to claim 2, characterized in that: The heating film control device further includes: A thermal pad is provided on the lower surface of the first horizontal portion and is used for conducting heat of the inner core.

4. The heating film control device according to claim 3, characterized in that: The heating film control device further includes: An outer shell, the outer shell includes a second top plate and four second side plates to form a second cavity, the shell is arranged in the second cavity, the outer wall of the first top plate is fixedly connected to the inner wall of the second top plate, and a notch is formed on a second side plate of the four second side plates close to the connecting row, and the width of the notch is the same as the width of the vertical portion.

5. The heating film control device according to claim 4, characterized in that: A mounting hole is formed on one end of the mounting platform away from the thermal pad. Wherein, the heating film control device further includes: A mounting pad is fixed to the bottom of the mounting platform through the mounting hole so that the bottom of the mounting pad and the bottom of the thermal pad are in the same plane.

6. A battery pack, characterized in that: The battery pack includes: Liquid cooling plate; A heating film, wherein a first surface of the heating film is bonded to a first side of the liquid cooling plate via a thermally conductive structural adhesive, and a second surface of the heating film is used to bond to a surface of a battery cell via a thermally conductive structural adhesive, the first surface and the second surface being opposite to each other; The heating film control device according to any one of claims 1 to 5, comprising a mounting pad, a thermal pad, and a relay, wherein the mounting pad is fixed to the second side of the liquid cooling plate, the thermal pad is in close contact with the liquid cooling plate to transfer the heat of the relay to the liquid cooling plate through the thermal pad, and the relay is connected to the heating film.

7. The battery pack according to claim 6, characterized in that: The battery pack further includes: a detection unit, the detection unit being arranged on a side of the battery cell and being used to detect operating parameters of the battery cell; A battery control unit, wherein a first end of the battery control unit is connected to the relay, a second end of the battery control unit is connected to the detection unit, and the battery control unit is used to control the connection or disconnection of the relay according to the operating parameters.

8. The battery pack according to claim 7, characterized in that: The operating parameters include leakage current value and battery core temperature value, When the battery control unit detects that the leakage current value is greater than the corresponding warning threshold, and / or the battery cell temperature value is greater than the corresponding warning threshold, the battery control unit controls the relay to disconnect so that the heating film stops working.

9. The battery pack according to claim 7, characterized in that: The battery pack further includes: A battery pack disconnecting unit is provided on the second side of the liquid cooling plate and adjacent to the heating film control device. The battery pack disconnecting unit is electrically connected to a second contact on the mounting platform of the heating film control device.

10. The battery pack according to claim 9, characterized in that: The heating film includes a first heating film and a second heating film. The first heating film is laid on a side of the liquid cooling plate close to the heating film control device. The second heating film is laid on a side of the liquid cooling plate close to the battery pack disconnect unit.

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