Battery heating device and battery

Abstract

The utility model relates to the technical field of battery heating, in particular to a battery heating device and a battery, the battery heating device comprises a heating film, a heat conducting plate laminated with the heating film, and a heat conducting coating arranged between the heating film and the heat conducting plate; heating wires are distributed in the heating film, the heating wires are arranged in the heating film in a bent mode to form internal wires and external wires surrounding the internal wires, and the external wires divide the internal wires into multiple groups of heating wire clusters; the heating wire provides heat for heating the battery, and the external wire fills the gap at the edge of the heating film to enlarge the heating range.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery heating technical field, especially a kind of battery heating device and battery.

BACKGROUND

[0002] In the new energy vehicle operated under low temperature condition, outdoor electronic equipment and the energy storage system applied in high-cold region, the electrolyte viscosity inside battery increases, battery charging and discharging capacity is limited, affect the normal life use of user, while under low temperature environment, the chemical reaction rate inside battery slows down, possibly lead to the increase of non-uniformity in battery charging and discharging process, in turn trigger local overheating, lithium precipitation and other problems, low temperature even accelerates the aging process of internal material of battery, shortens the service life of battery.

[0003] Therefore, in order to overcome these challenges, the industry will generally add heating function to battery heating device, such as adding heating device outside to heat battery externally, however, the traditional external heating device has limitations, and is prone to uneven heating or affecting the overall structural layout of battery.

UTILITARY MODEL CONTENT

[0004] To solve the technical problem of uneven heating of existing heating device, the utility model provides a kind of battery heating device and battery.

[0005] The utility model solves technical problem's scheme to provide a kind of battery heating device, the battery heating device includes heating film, with the heat conduction plate of the heating film layer arrangement and the heat conduction coating of being arranged between the heating film and the heat conduction plate;The heating wire is arranged in the heating film, the heating wire is bent and set in the heating film and forms internal line and external line around the internal line, and the external line divides the internal line into multiple groups of heating filament groups.

[0006] Preferably, the density of the internal line arranged in the heating filament group gradually increases from the middle region to both ends of the heating film.

[0007] Preferably, the internal line is arranged in an array in the heating filament group.

[0008] Preferably, the heating film includes at least three groups of heating filament groups.

[0009] Preferably, the battery heating device further includes a heat insulation layer arranged on the side of the heating film away from the heat conduction plate.

[0010] Preferably, the battery heating device is provided with a thermal protector.

[0011] Preferably, the heat conduction coating is a graphene heat conduction coating.

[0012] Preferably, the heat-conducting plate is electrically connected with the heating film.

[0013] The utility model also provides a kind of battery, the battery includes battery cell module and the battery heating device of preceding, the battery also includes the PCB board electrically connected with the battery cell module, the battery heating device is attached and arranged in the side of the battery cell module away from the PCB board.

[0014] Preferably, the heat-conducting plate is attached to the side close to the battery cell module.

[0015] Compared with the prior art, the battery heating device and the battery provided by the utility model have the following advantages.

[0016] 1. The battery heating device provided by the utility model is used for heating battery, and includes a heating film, a heat-conducting plate and a heat-conducting coating. Heating wires are arranged in the heating film. The heating wires are divided into external wires and internal wires. The internal wires form heating wire groups. The external wires can fill the gaps between the heating wire groups and the internal wires and the edges of the heating film, expand the heating range, enclose and concentrate the heat of each group, and improve the heating efficiency of each local part. The heat-conducting plate quickly and uniformly conducts heat. The heat-conducting coating improves the heat conduction efficiency and reduces the interface thermal resistance.

[0017] 2. In the battery heating device provided by the utility model, the internal wires are unevenly arranged in the heating film. When heating, the temperature in the battery is not completely consistent due to the different distances from the external environment. Therefore, to adapt to the different temperatures in the battery, the temperatures of the heating wire groups arranged unevenly are also not the same. The temperature gradually increases from the middle area with low density to the two sides with low density. The heating effect on the battery also gradually increases from the middle area to the two sides.

[0018] 3. In the battery heating device provided by the utility model, the internal wires are arrayed in different heating wire groups. The internal wires are evenly distributed in the heating groups. The length of the heating wires can be more effectively utilized, the area of heat generation is increased, the loss in the heat conduction process is reduced, the arrayed arrangement is more intuitive, the heat distribution of the heating film is optimized, and thermal stress is reduced.

[0019] 4. In the battery heating device provided by the utility model, at least three heating wire groups make the heating film have different heating powers and temperatures on different areas, more accurately respond to the actual heating needs of the battery, distribute heat on a larger area with at least three heating wire groups, reduce the temperature gradient, improve the temperature uniformity of the whole battery, and improve the heating efficiency.

[0020] 5. The battery heating device provided by the utility model, the heat insulation layer reduces the heat loss of the heat film to the external environment, blocks the heat transfer, ensures that the heat generated by the heat film is more used for heating the battery, improves the heating efficiency, and maintains the stability of the battery temperature.

[0021] 6. The battery heating device provided by the utility model, the thermal protector monitors the temperature inside the battery heating device in real time, ensures that the temperature does not exceed the safety range, when the temperature reaches or exceeds the set threshold, the thermal protector will quickly cut off the power supply, prevents the battery from being damaged or causing a safety accident due to overheating, when the heating wire fails or the circuit is short-circuited, the thermal protector will also respond immediately, reduces the working time of the battery and the heating device in the overheated state, thereby reducing the influence of thermal stress on the material and prolonging the service life.

[0022] 7. The battery heating device provided by the utility model, graphene is one of the materials with the highest thermal conductivity coefficient at present, and the theoretical thermal conductivity can reach 5300W / mK, which is much higher than other common materials, the high thermal conductivity enables the heat conduction coating to quickly transfer the heat generated by the heat film to the surface of the battery, shortens the heat transfer path from the heat film to the surface of the battery, and improves the heating efficiency.

[0023] 8. The utility model also provides a battery, including the electric core module and the battery heating device as described above, the battery also includes the PCB board that is electrically connected with the electric core module, the battery heating device is attached to the side of the electric core module far from the PCB board, the heat source is isolated, the electromagnetic interference is reduced, and the safety of the PCB board and the rest of the circuit elements is protected; the heating device is directly attached to one side of the electric core module, and heat is more directly and efficiently transferred to the electric core module.

[0024] 9. The battery provided by the utility model, the close attachment of the heat conduction plate and the electric core module reduces the thermal resistance, so that the heat of the heat film loses less in the transfer process, further improves the efficiency of heat transfer, the heat conduction plate also has the function of heat insulation and heat preservation, reduces the influence of the external environment on the temperature of the electric core module, and the heat conduction plate can conduct the intermediate high temperature of the electric core module in the use state to the two ends of the low temperature, so that the electric core module utilizes part of its own temperature, and the heat distribution efficiency is improved.

DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0026] Figure 1It is the left view of the battery heating device provided by the first embodiment of the utility model.

[0027] Figure 2 It is the plan view of the heating film of the battery heating device provided by the first embodiment of the utility model.

[0028] Figure 3 It is the plan view of the heat conduction plate of the battery heating device provided by the first embodiment of the utility model.

[0029] Figure 4 It is the explosion schematic view of the battery provided by the second embodiment of the utility model.

[0030] Explanation of the attached drawing:

[0031] 100, battery heating device;200, battery;

[0032] 1, heating film;2, heat conduction plate;3, heat conduction coating;4, heat insulation layer;5, thermal protector;6, PCB board;7, electric core module;

[0033] 11, heating wire;12, heating wire group;111, internal line;112, external line.

Specific implementation

[0034] In order to make the purpose of the utility model, technical scheme and advantage more clear and obvious, the utility model is further explained in detail below by combining with the attached drawing and implementation example.It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0035] It should be noted that the terms "first" and "second" in the specification and claims of the utility model are used to distinguish different objects, and are not used to describe a specific order.

[0036] It should be noted that when an element is referred to as "fixed to" another element, it can be directly on another element or there can be a middle element.When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element.The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for illustrative purposes.

[0037] In the utility model, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "transverse", "longitudinal" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are mainly used for better describing the utility model and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0038] In addition to indicating the orientation or positional relationship, the above-mentioned terms can also be used to indicate other meanings, for example, the term "upper" can also be used to indicate a certain dependent relationship or connection relationship in some cases. For those skilled in the art, the specific meaning of these terms in the utility model can be understood according to the specific situation.

[0039] In addition, the terms "mounting", "setting", "providing", "connecting", "connecting" should be understood broadly. For example, it can be fixedly connected, detachably connected, or integrally constructed; it can be mechanically connected, or electrically connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication between two devices, elements or components. For those skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific situation.

[0040] Please refer to Figures 1-2 The utility model provides a kind of battery heating device 100, including heating film 1, with the heat-conducting plate 2 of the laminated setting of heating film 1 and the heat-conducting coating 3 of the setting between heating film 1 and heat-conducting plate 2.

[0041] Understandably, heating film 1 generates heat by current flowing through heating film 1, improves the temperature of battery 200, ensures that battery 200 operates within the optimum working temperature range;Heat-conducting plate 2 evenly distributes the heat generated by heating film 1, and transfers heat to the surface of battery 200, which helps to improve heating efficiency and uniformity;Heat-conducting coating 3 is arranged on the side of heating film 1 close to heat-conducting plate 2, which can fill small gaps and unevenness, and also ensure good thermal contact between heating film 1 and heat-conducting plate 2.

[0042] Further, heating wire 11 is arranged in heating film 1, and heating wire 11 is arranged in heating film 1 to form internal line 111 and external line 112 surrounding internal line 111, and external line 112 divides internal line 111 into a plurality of heating wire groups 12.

[0043] Understandably, heating wire 11 is arranged in heating film 1, which can reduce hot spots and cold spots in heating film 1, optimize thermal efficiency, and heat battery 200 more evenly.

[0044] The external wires 112 fill the gaps between the heating wire groups 12 and between the internal wires 111 and the edges of the heating film 1, expand the heating range, and can also enclose and concentrate the heat of the heating wire groups 12, thereby improving the heating efficiency of each local part.

[0045] Specifically, the external wires 112 are arranged uniformly around the internal wires 111, effectively filling the gaps between the internal wires 111 and the edges.

[0046] Further, specifically, the density of the arrangement of the internal wires 111 in the heating wire groups 12 gradually increases from the middle region to both ends of the heating film 1.

[0047] Understandably, the density gradually increases from the middle region to the edge region, the coil on both sides of the edge region is set to be more dense, and the number of bends of the heating wire 11 gradually decreases to the edge region, the density of the internal wires 111 between different heating wire groups 12 is gradually changed, the heating efficiency is improved, and the best heating effect is achieved.

[0048] Specifically, a computer simulation tool can be used to predict the influence of different density layouts on heat distribution, and the simulation results can also be compared with actual experimental processes to verify the degree of conformity between actual heating effect and theoretical design, optimize the specific arrangement of the heating wire 11, and make necessary adjustments.

[0049] The battery heating device 100 provided by the utility model can effectively and safely make the battery 200 work at full power in an environment of-20 degrees during the test process, test the temperature of the battery 200 at different points, and keep the temperature of the battery 200 in a range of 5 degrees higher than the ambient temperature.

[0050] More specifically, the internal wires 111 are arranged in an array in the heating wire groups 12.

[0051] Understandably, the bending angle and spacing of the heating wire 11 are accurately controlled to obtain heating wire groups 12 of different areas, and the arrangement of the internal wires 111 in different heating wire groups 12 can bring different heating efficiencies, so that the heating film 1 can reach the required temperature in a shorter time.

[0052] Specifically, the internal wires 111 can be arranged in the form of parallel coils in the heating wire 11, a plurality of internal wires 111 connected in parallel are arranged in parallel by bending in the heating wire group 12, and are arranged in an array, this array arrangement is easy to manufacture and control heat distribution, and is suitable for uniform heating scenes.

[0053] Optionally, the inner wire 111 can also be bent into a spiral shape within the heating wire bundle 12, forming multiple spiral coils, and surrounded by the outer wire 112. The spiral shape can increase the heat radiation area of the heating wire 11, suitable for areas that require concentrated heating. The inner wire 111 can also be arranged in a grid pattern within the heating wire bundle 12, forming a regular grid structure, ensuring that every point on the heating film 1 can obtain uniform heat, suitable for scenarios that require highly uniform heating.

[0054] Optionally, the heating film 1 includes at least three groups of heating wire bundles 12.

[0055] Specifically, the number of heating wire bundles 12 in the heating film 1 is related to the area of the heating film 1 and the heat-conducting plate 2.

[0056] In the present application, a heat-conducting plate 2 with a length of 6655mm and a width of 150mm is provided, and the heating film 1 has an area suitable for cooperation with the heat-conducting plate 2. The heating film 1 contains at least 14 groups of heating wire bundles 12, and the 14 groups of heating wire bundles 12 are arranged symmetrically with respect to the central axis of the heating film 1 in the width direction. The density of the inner wire 111 of the heating wire bundle 12 increases from the central axis area to the edges on both sides.

[0057] Further, as shown in Figure 1 , the battery heating device 100 further comprises a heat insulation and heat preservation layer 4 arranged on the side of the heating film 1 away from the heat-conducting plate 2.

[0058] It can be understood that the heat insulation and heat preservation layer 4 effectively reduces the heat loss through the side of the heating film 1 away from the heat-conducting plate 2, and improves the heat preservation performance of the heating device.

[0059] Optionally, the heat insulation and heat preservation layer 4 is made of materials with good thermal resistance and heat resistance, including high-temperature-resistant heat insulation foam, ceramic fiber, polyurethane foam, or heat insulation film, etc. In the present embodiment, no specific limitation is made.

[0060] In order to better realize temperature protection for the battery heating device 100, as shown in Figure 3 , the battery heating device 100 is provided with a thermal protector 5.

[0061] It can be understood that the thermal protector 5 can monitor the temperature in real time and cut off the power supply or take other protective measures when the set threshold is exceeded, preventing the equipment from overheating and improving the reliability and stability performance of the battery heating device 100.

[0062] Optionally, the thermal protector 5 can be an automatic power-off temperature switch that will cut off the circuit when the temperature exceeds the set value, or a fuse that will melt when the temperature or current exceeds the set value. In the present embodiment, no specific limitation is made.

[0063] Further, the heat-conducting coating 3 is a graphene heat-conducting coating 3.

[0064] The heat-conducting coating 3 is generally made of a material with high heat conductivity, and graphene is one of the materials with the highest heat conductivity known at present, which can effectively ensure the heat transfer.

[0065] Specifically, the heat-conducting coating 3 can be applied to the heating film 1 by spraying, brushing or smearing, etc., and the coating is uniform and free of bubbles during the smearing process, and the thickness of the heat-conducting coating 3 is moderate, which can fill the gap and avoid affecting the heat conduction efficiency due to the over-thickness of the coating.

[0066] Further, the heat-conducting plate 2 is electrically connected with the heating film 1.

[0067] Further, the heat-conducting plate 2 and the heating film 1 are respectively electrically connected with the thermal protector 5, and the temperature of the heat-conducting plate 2 and the heating film 1 can be monitored in real time, and the thermal protector 5 evaluates the thermal state of the heat-conducting plate 2 and the heating film 1, and if the temperature of the heat-conducting plate 2 or the heating film 1 exceeds the set safety threshold, the thermal protector 5 disconnects the power switch of the heating film 1.

[0068] Referring to Figure 4 The utility model discloses a second embodiment further provides a kind of battery 200, including electric core module 7 and like the battery heating device 100 provided in first embodiment, battery 200 further include with electric core module 7 electrically connected PCB board 6, battery heating device 100 is attached and arranged in the side of electric core module 7 away from PCB board 6.

[0069] It can be understood that battery heating device 100 is attached in the side of electric core module 7 away from PCB board 6, it is helpful to uniformly heat the whole surface of electric core module 7, avoid the temperature inconsistency caused by local heating uneven, simultaneously prevent high temperature from causing damage to PCB board 6 and its electronic components.

[0070] Further, the heat-conducting plate 2 is attached and arranged on the side close to the electric core module 7.

[0071] It can be understood that the close attachment of the heat-conducting plate 2 and the electric core module 7 reduces the thermal resistance, so that the heat of the heating film 1 loses less in the transmission process.

[0072] Specifically, the heat-conducting plate 2 can be an aluminum heat-conducting plate 2, and aluminum alloy has good heat conductivity. The thickness and shape of the heat-conducting plate 2 are adaptively matched according to the specific requirements of the electric core module 7 to ensure maximum coverage of the electric core module 7.

[0073] During the use of the battery 200, the heat dissipation power of the two sides will be greater than that of the center position of the electric core module 7, and the heat-conducting plate 2 can conduct the self-heating high temperature in the middle of the electric core module 7 to the low temperature at both ends, so that the battery 200 can utilize a part of its own temperature to improve the heat uniformization efficiency.

[0074] And the high temperature area of the heating film 1 generates heat, and the high temperature area of the self-heating of the battery cell module 7 is opposite, the density of the internal line 111 is gradually increased from the middle area to both sides, and the heat efficiency is balanced.

[0075] Further, the battery 200 also includes a battery management system (not shown in the figure), and the battery heating device 100 is electrically connected with the battery management system.

[0076] Specifically, the battery management system monitors the temperature of the battery cell module 7, and if it is higher than the preset height, the power channel of the heating film 1 is disconnected, and the safety performance of the battery heating device 100 is improved.

[0077] Compared with the prior art, the battery heating device and the battery provided by the utility model have the following advantages:

[0078] 1. The battery heating device provided by the utility model is used for heating the battery, and comprises a heating film, a heat conduction plate and a heat conduction coating.

[0079] 2. The battery heating device provided by the utility model is characterized in that the internal lines are unevenly arranged in the heating film.

[0080] 3. The battery heating device provided by the utility model is characterized in that the internal lines are arrayed in different heating wire groups.

[0081] 4. The battery heating device provided by the utility model is characterized in that the heating film has different heating powers and temperatures in different areas.

[0082] 5. The battery heating device provided by the utility model, the heat insulation layer reduces the heat loss of the heat film to the external environment, blocks the heat transfer, ensures that more heat generated by the heat film is used for heating the battery, improves the heating efficiency, and maintains the stability of the battery temperature.

[0083] 6. The battery heating device provided by the utility model, the thermal protector monitors the temperature inside the battery heating device in real time, ensures that the temperature does not exceed the safety range, when the temperature reaches or exceeds the set threshold, the thermal protector will quickly cut off the power supply, prevents the battery from being damaged or causing a safety accident due to overheating, when the heating wire fails or the circuit is short-circuited, the thermal protector will also respond immediately, reduces the working time of the battery and the heating device in the overheated state, thereby reducing the influence of thermal stress on the material and prolonging the service life.

[0084] 7. The battery heating device provided by the utility model, graphene is one of the materials with the highest thermal conductivity coefficient known at present, and the theoretical thermal conductivity can reach 5300W / mK, which is much higher than other common materials, the high thermal conductivity enables the heat conduction coating to quickly transfer the heat generated by the heat film to the surface of the battery, shortens the heat transfer path from the heat film to the surface of the battery, and improves the heating efficiency.

[0085] 8. The utility model also provides a battery, including the electric core module and the battery heating device as described above, the battery also includes the PCB board that is electrically connected with the electric core module, the battery heating device is attached to the side of the electric core module far from the PCB board, the heat source is isolated, the electromagnetic interference is reduced, and the safety of the PCB board and the rest of the circuit elements is protected; the heating device is directly attached to one side of the electric core module, and the heat is more directly and efficiently transferred to the electric core module.

[0086] 9. The battery provided by the utility model, the close attachment of the heat conduction plate and the electric core module reduces the thermal resistance, so that the heat of the heat film loses less in the transfer process, further improves the efficiency of heat transfer, the heat conduction plate also has the function of heat insulation and heat preservation, reduces the influence of the external environment on the temperature of the electric core module, and the heat conduction plate can conduct the intermediate high temperature of the electric core module in the use state to the low temperature of both ends, so that the electric core module utilizes part of its own temperature, and the heat distribution efficiency is improved.

[0087] The above only describes the preferred embodiments of the utility model, and does not limit the utility model, any modification, equivalent replacement and improvement within the principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A battery heating device, characterized by: The battery heating device comprises a heating film, a heat-conducting plate stacked with the heating film, and a heat-conducting coating arranged between the heating film and the heat-conducting plate. The heating film is provided with heating wires, which are arranged in the heating film to form internal lines and external lines surrounding the internal lines, and the external lines divide the internal lines into groups of heating wire clusters.

2. The battery heating apparatus of claim 1, wherein: The density of the internal lines arranged in the heating wire clusters gradually increases from the middle region of the heating film to both ends.

3. The battery heating apparatus of claim 1, wherein: The internal lines are arranged in an array in the heating wire clusters.

4. The battery heating apparatus of claim 1, wherein: The heating film comprises at least three groups of heating wire clusters.

5. The battery heating apparatus of claim 1, wherein: The battery heating device further comprises a thermal insulation layer arranged on the side of the heating film away from the heat-conducting plate.

6. The battery heating apparatus of claim 1, wherein: The battery heating device is provided with a thermal protector.

7. The battery heating apparatus of claim 1, wherein: The heat-conducting coating is a graphene heat-conducting coating.

8. The battery heating apparatus of claim 1, wherein: The heat-conducting plate is electrically connected with the heating film.

9. A battery, characterized by: The battery comprises a battery cell module and the battery heating device according to any one of claims 1-8, and further comprises a PCB board electrically connected with the battery cell module, and the battery heating device is attached to the side of the battery cell module away from the PCB board.

10. The battery of claim 9, wherein: The heat-conducting plate is attached to the side close to the battery cell module.

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