Heating device and battery system

Abstract

The utility model provides a heating device and a battery system, the heating device comprises: at least two heating units, each heating unit has a heating zone and a leading-out zone, the power density of the heating zone is greater than the power density of the leading-out zone, and the leading-out zone of at least one heating unit and at least another heating unit are laminated and mutually insulated. According to the heating device, the at least two heating units are arranged, each area to be heated can be independently controlled to be heated, the leading-out area of at least one heating unit is arranged to be stacked with at least one other heating unit, and under the condition that the overall size of the heating device is fixed, the area, covered by the heating areas, of a piece to be heated can be increased, and the heating efficiency is improved. Therefore, the integration rate of the heating device is improved, independent controllable heating of the heating units is matched, the uniformity of the temperature of the heated part to be heated is improved, and the temperature difference between the areas of the part to be heated is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery thermal management, and more specifically, to a heating device and a battery system. Background Art

[0002] In the related art, the performance of the battery system is greatly affected by temperature, and the heating system can be used to heat the battery cell components in the battery system to maintain the temperature of the battery cell components within an appropriate range. However, the different heat dissipation capabilities of various areas of the battery cell components will lead to temperature differences between the various areas of the battery cell components, and the temperature difference will change in real time. Conventional heating systems are difficult to evenly heat the battery cell components. The operation of the battery cell components under uneven temperature conditions will reduce the charging and discharging efficiency and cycle life of the battery system. Utility Model Content

[0003] One purpose of the utility model is to provide a new technical solution for a heating device, which can at least solve the problem in the prior art that it is difficult to uniformly heat a battery core assembly.

[0004] Another object of the present utility model is to provide a battery system, comprising the above-mentioned heating device.

[0005] According to a first aspect of the utility model, a heating device is provided, comprising: at least two heating units, each of the heating units having a heating zone and a lead-out zone, the power density of the heating zone being greater than the power density of the lead-out zone, and the lead-out zone of at least one of the heating units being stacked and insulated from each other with at least another of the heating units.

[0006] Optionally, the lead-out region of at least one of the heating units is stacked with the heating region of at least another of the heating units.

[0007] Optionally, a projection of the lead-out region of at least one of the heating units and the heating region of at least another of the heating units along a thickness direction of the heating units completely overlaps.

[0008] Optionally, the projection of the heating zone of at least one of the heating units and the heating zone of at least another of the heating units along the thickness direction of the heating units do not overlap.

[0009] Optionally, the two adjacent heating units are a first heating unit and a second heating unit, the lead-out zone of the first heating unit is stacked with the heating zone of the second heating unit, and / or the lead-out zone of the second heating unit is stacked with the heating zone of the first heating unit.

[0010] Optionally, the heating unit includes: a packaging film, the packaging film having the heating area and the lead-out area; a heating wire, the heating wire is arranged on the packaging film and located in the heating area; a wire, the wire is arranged on the packaging film and located in the lead-out area, and the wire is electrically connected to the heating wire.

[0011] Optionally, each of the heating zones includes a plurality of heating sub-zones, each of the heating sub-zones is provided with a corresponding heating wire, each of the heating sub-zones is adjacent to the lead-out zone, and the heating wires of the plurality of heating sub-zones are insulated from each other and are respectively electrically connected to the corresponding wires.

[0012] Optionally, the plurality of heating sub-areas are arranged along a first direction, the heating area and the lead-out area are arranged along a second direction, and the first direction and the second direction intersect.

[0013] Optionally, at least two of the heating units are arranged along the second direction.

[0014] Optionally, the heating device includes three heating units, the three heating units are arranged along the second direction, and each heating zone includes three heating sub-zones arranged along the first direction.

[0015] Optionally, in the first direction, the plurality of conducting wires of each heating unit are led out from the same end thereof.

[0016] Optionally, in the first direction, the plurality of wires of the plurality of heating units are led out from the same end of the heating device.

[0017] Optionally, the heating device further comprises: a lead-out component, the lead-out component is connected to the corresponding wire, and the lead-out component is located outside the lead-out area.

[0018] Optionally, among the three heating units, the area of ​​the heating zone of the middle heating unit is larger than the areas of the heating zones of the heating units at both ends.

[0019] Optionally, in the three heating sub-zones of each heating zone, the area of ​​the middle heating sub-zone is larger than the areas of the heating sub-zones at both ends.

[0020] Optionally, in the second direction, the lead-out areas of the heating units located at both ends of at least two of the heating units are located at one end of the corresponding heating area close to the center of the heating device.

[0021] Optionally, the heating device further comprises: two insulating layers, and at least two of the heating units are arranged between the two insulating layers.

[0022] According to a second aspect of the present invention, a battery system is provided, comprising the heating device described in any one of the above embodiments.

[0023] According to the heating device of the utility model, at least two heating units are provided, and the part to be heated can be divided into several areas to be heated, and each area to be heated can be independently controlled for heating. In addition, a heating area with a relatively large medium power is used to heat the part to be heated, and a lead-out area with a relatively small power leads out the heating unit to connect with an external power supply and a controller, and the lead-out area of ​​at least one heating unit is provided to be stacked with at least one other heating unit. When the overall size of the heating device is constant, the area of ​​the part to be heated covered by the heating area can be increased, thereby facilitating the improvement of the integration rate of the heating device, and cooperating with the independent controllable heating of each heating unit, it is also beneficial to improve the uniformity of the temperature of the part to be heated after being heated, and reduce the temperature difference between the areas of the part to be heated.

[0024] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the present invention and, together with the description, serve to explain the principles of the present invention.

[0026] Figure 1 is an exploded view of a heating device according to an embodiment of the utility model;

[0027] Figure 2 It is a top view of a heating unit No. 1 in a heating device according to an embodiment of the utility model;

[0028] Figure 3 It is a top view of a No. 2 heating unit and a No. 3 heating unit in a heating device according to an embodiment of the utility model;

[0029] Figure 4 It is an exploded diagram of a battery system according to an embodiment of the utility model.

[0030] Reference numerals

[0031] Heating device 100;

[0032] Heating unit 10; No. 1 heating unit 10a; No. 2 heating unit 10b; No. 3 heating unit 10c; heating area 11; heating sub-area 111; No. 1 sub-area 111a; No. 2 sub-area 111b; No. 3 sub-area 111c; lead-out area 12; packaging film 13; heating wire 14; wire 15; a pair of wires 16;

[0033] Lead-out assembly 20; solder joint protection silicone 21; lead wire 22; connection terminal 23;

[0034] Insulation layer 30;

[0035] Battery cell assembly 200;

[0036] Thermal conductive structural adhesive 300;

[0037] Battery system 400. DETAILED DESCRIPTION

[0038] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0039] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0040] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0041] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0042] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0043] The following first describes in detail the heating device 100 according to the embodiment of the utility model with reference to the drawings.

[0044] like Figures 1 to 4 As shown, the heating device 100 according to the embodiment of the present invention includes: at least two heating units 10.

[0045] Specifically, there are at least two heating units 10, each heating unit 10 has a heating area 11 and a lead-out area 12, the power density of the heating area 11 is greater than the power density of the lead-out area 12, and the lead-out area 12 of at least one heating unit 10 is stacked with at least another heating unit 10 and insulated from each other.

[0046] In other words, the heating device 100 according to the embodiment of the present invention is mainly composed of at least two heating units 10 .

[0047] The heating device 100 can be used to heat the part to be heated, and the heating device 100 can be installed on the surface of the part to be heated. Optionally, the heating device 100 can be used in the battery system 400. The part to be heated can include but is not limited to the battery cell assembly 200 in the battery system 400. The battery cell assembly 200 can include a plurality of battery cells arranged in sequence. The heating device 100 can be attached to the surface of the part to be heated and adapted to the surface shape of the part to be heated. For example, the battery cell assembly 200 can be in the shape of a cuboid, and the heating device 100 can be in the shape of a cuboid to adapt to the square surface of the battery cell assembly 200.

[0048] Optionally, the heating device 100 may be disposed on a surface with the largest area among the outer surfaces of the battery cell assembly 200 .

[0049] The number of heating units 10 in the heating device 100 is at least two, and the specific number can be designed according to the heat dissipation of the heated component. Each heating unit 10 can be independently controlled for heating, and the heating power of the heating unit 10 can be controlled by controlling the voltage or current, thereby controlling the temperature of the corresponding area on the heated component.

[0050] Taking the battery cell assembly 200 as an example, the battery cell assembly 200 is in contact with the environment on all sides and has greater heat dissipation, while the central area has less heat dissipation. The heating device 100 may include two heating units 10, one of which corresponds to the central area of ​​the battery cell assembly 200, and the other heating unit 10 may be arranged on all sides of the battery cell assembly 200 and surround the central area of ​​the battery cell assembly 200.

[0051] In addition, since the four corners of the battery cell assembly 200 have a large heat dissipation, the number of heating units 10 in the heating device 100 can also be five or more, each corner of the battery cell assembly 200 can correspond to a heating unit 10, and the remaining parts correspond to one or more heating units 10. Optionally, the battery system 400 may include nine heating units 10, and the nine heating units 10 may be distributed in a tic-tac-toe shape.

[0052] It should be noted that as long as the distribution of the heating units 10 is reasonable and can meet the requirement of temperature uniformity of the heated component, the number and distribution of the heating units 10 are not limited.

[0053] Each heating unit 10 has a heating area 11 and a lead-out area 12, and the power density of the heating area 11 is relatively large, while the power density of the lead-out area 12 is relatively small. The heating area 11 and the lead-out area 12 may be arranged adjacent to each other.

[0054] The heating zone 11 can heat the heated element by means of a larger heating power. An electronic device capable of generating heat can be arranged in the heating zone 11. The lead-out zone 12 can be used to lead out the terminals of the electronic device in the heating zone so as to facilitate connection with an external power supply and controller of the heating device 100. Thus, each heating unit 10 can be independently powered and independently controlled to adjust its heating power.

[0055] In the heating device 100, the lead-out area 12 of at least one heating unit 10 and the heating area 11 and / or the lead-out area 12 of at least another heating unit 10 can be stacked, and the stacking may include partial overlap and complete overlap, which is not limited here. That is to say, when the heating device 100 is laid on the heating surface of the heated part, in any direction intersecting with the heating surface, the lead-out area 12 of at least one heating unit 10 can overlap with other heating areas 11, can overlap with other lead-out areas 12, and can also overlap with other heating areas 11 and lead-out areas 12 respectively. Specific examples include but are not limited to the following:

[0056] In case 1, the lead-out area 12 of one heating unit 10 is stacked with another heating unit 1011;

[0057] In case 2, the lead-out area 12 of one heating unit 10 is stacked with multiple other heating units 10;

[0058] In case three, the lead-out regions 12 of a plurality of heating units 10 are stacked with another heating unit 10 .

[0059] In case 4, the lead-out regions 12 of a plurality of heating units 10 are stacked with another plurality of heating units 10 .

[0060] Since the lead-out area 12 does not play a major heating role, at least one lead-out area 12 is provided to be stacked with other heating units 10, so that the heating area 11 can cover a larger area, thereby increasing the effective heating area of ​​the heating device 100, avoiding the occurrence of unheated areas between two adjacent heating units 10 of the heated part or reducing the area of ​​the unheated area, which is beneficial to improving the integration rate and heating effect of the heating device 100.

[0061] In addition, the stacked parts of at least two heating units 10 are insulated from each other. Specifically, the lead-out area 12 of at least one heating unit 10 is insulated from at least another prefabricated stacked heating unit 10 to ensure safety and avoid short circuits between the heating units 10 that could damage the heating device 100.

[0062] Therefore, according to the heating device 100 of the embodiment of the utility model, at least two heating units 10 are provided, and the part to be heated can be divided into several areas to be heated, and each area to be heated can be independently controlled for heating. In addition, a heating area 11 with a relatively large medium power is used to heat the part to be heated, and a lead-out area 12 with a relatively small power is used to lead out the heating unit 10 to connect with an external power supply and a controller, and the lead-out area 12 of at least one heating unit 10 is provided to be stacked with at least one other heating unit 10. When the overall size of the heating device 100 is constant, the area of ​​the part to be heated covered by the heating area 11 can be increased, thereby facilitating the improvement of the integration rate of the heating device 100, and cooperating with the independent controllable heating of each heating unit 10, it is also beneficial to improve the uniformity of the temperature of the part to be heated after being heated, and reduce the temperature difference between the various areas of the part to be heated.

[0063] When the heating device 100 is applied to the battery system 400 , the charging and discharging efficiency and cycle life of the battery system 400 can be improved, and the aging speed and safety risks of the battery system 400 can be reduced.

[0064] In addition, a temperature sensor may be provided on the heated part, and the voltage or current of each heating unit 10 may be changed according to the real-time temperature distribution of the battery system 400 collected by the temperature sensor, thereby changing the heating power of the corresponding area.

[0065] According to a specific embodiment of the present invention, the lead-out area 12 of at least one heating unit 10 is stacked with the heating area 11 of at least another heating unit 10 .

[0066] The specific situations may include but are not limited to the following.

[0067] In case 1, the lead-out area 12 of one heating unit 10 is stacked with the heating area 11 of another heating unit 10;

[0068] In case 2, the lead-out area 12 of one heating unit 10 is stacked with the heating areas 11 of multiple other heating units 10;

[0069] In case three, the lead-out regions 12 of a plurality of heating units 10 are stacked with the heating region 11 of another heating unit 10 .

[0070] In case 4, the lead-out regions 12 of a plurality of heating units 10 are stacked with the heating regions 11 of another plurality of heating units 10 .

[0071] Since the lead-out zone 12 does not play a major heating role, the lead-out zone 12 and the heating zone 11 are stacked, and the total area covered by all the heating zones 11 can be further increased, thereby increasing the effective heating area of ​​the heating device 100, avoiding the occurrence of unheated areas between two adjacent heating units 10 of the heated part or reducing the area of ​​the unheated area, which is beneficial to further improve the integration rate and heating effect of the heating device 100.

[0072] According to an embodiment of the present invention, the projection of the lead-out area 12 of at least one heating unit 10 and the heating area 11 of at least another heating unit 10 along the thickness direction of the heating unit 10 completely overlaps.

[0073] Specifically, the heating unit 10 may be a thin sheet structure or a thin plate structure so as to better fit the surface of the heated object. In the thickness direction of the heating unit 10, at least one heating unit 10 and at least another heating unit 10 may be stacked. For ease of explanation, a surface perpendicular to the thickness direction of the heating unit 10 may be defined as a projection surface. The projection of the lead-out area 12 of at least one heating unit 10 on the projection surface may completely overlap with the orthographic projection of the heating area 11 of at least another heating unit 10 on the projection surface. Specifically, the following situations may be included but are not limited to.

[0074] Case 1: the orthographic projection of the lead-out area 12 of one heating unit 10 on the projection plane completely overlaps with the orthographic projection of the heating area 11 of another heating unit 10 on the projection plane;

[0075] Case 2: the orthographic projection of the lead-out area 12 of one heating unit 10 on the projection plane completely overlaps with the orthographic projections of the heating areas 11 of the other plurality of heating units 10 on the projection plane;

[0076] In case three, the orthographic projections of the lead-out areas 12 of the plurality of heating units 10 on the projection plane completely overlap with the orthographic projections of the heating areas 11 of another heating unit 10 on the projection plane.

[0077] In case 4, the orthographic projections of the lead-out areas 12 of the plurality of heating units 10 on the projection plane completely overlap with the orthographic projections of the heating areas 11 of the other plurality of heating units 10 on the projection plane.

[0078] That is to say, the projections of the heating zones 11 of the above-mentioned heating units 10 on the projection plane can be connected with each other without any gaps. As a result, the heating zones 11 can cover the entire heating device 100, further increasing the effective heating area of ​​the heating device 100, so that each area of ​​the heated component can be controlled to heat and control the temperature, which is beneficial to improving the uniformity of the temperature of the heated component after heating and reducing the temperature difference between the various areas of the heated component.

[0079] According to some other embodiments of the present invention, the projection of the heating area 11 of at least one heating unit 10 and the heating area 11 of at least another heating unit 10 along the thickness direction of the heating unit 10 does not overlap. It should be noted that the non-overlapping means completely non-overlapping, and there is no overlapping area between the two.

[0080] Specifically, it may include but not be limited to the following situations.

[0081] Case 1: the orthographic projection of the heating area 11 of one heating unit 10 on the projection surface does not overlap with the orthographic projection of the heating area 11 of another heating unit 10 on the projection surface;

[0082] Case 2: the orthographic projection of the heating area 11 of one heating unit 10 on the projection plane does not overlap with the orthographic projections of the heating areas 11 of the other plurality of heating units 10 on the projection plane;

[0083] In case three, the orthographic projections of the heating areas 11 of the plurality of heating units 10 on the projection plane do not overlap with the orthographic projection of the heating area 11 of another heating unit 10 on the projection plane.

[0084] In case 4, the orthographic projections of the heating areas 11 of a plurality of heating units 10 on the projection plane do not overlap with the orthographic projections of the heating areas 11 of another plurality of heating units 10 on the projection plane.

[0085] In other words, the heating zones 11 of at least two heating units 10 do not overlap, so that these heating areas can be independent of each other and directly act on the part to be heated, avoiding overheating caused by overlapping of these heating areas, which is beneficial to improving the temperature uniformity of the part to be heated after heating and reducing the temperature difference between different areas of the part to be heated.

[0086] Preferably, projections of the heating areas 11 of all the heating units 10 in the heating device 100 along the thickness direction of the heating unit 10 do not overlap with each other.

[0087] In some specific embodiments of the present invention, two adjacent heating units 10 are a first heating unit and a second heating unit, the lead-out area 12 of the first heating unit is stacked with the heating area 11 of the second heating unit, and / or the lead-out area 12 of the second heating unit is stacked with the heating area 11 of the first heating unit.

[0088] The specific situations may include but are not limited to the following.

[0089] In case 1, the lead-out area 12 of the first heating unit is stacked with the heating area 11 of the second heating unit;

[0090] Case 2: the lead-out area 12 of the second heating unit is stacked with the heating area 11 of the first heating unit;

[0091] In case three, the lead-out area 12 of the first heating unit is overlapped with the heating area 11 of the second heating unit, and the lead-out area 12 of the second heating unit is overlapped with the heating area 11 of the first heating unit.

[0092] For example, Figure 1 As shown, the heating device 100 may include three heating units 10 arranged side by side, and the three heating units 10 are heating unit No. 1 10a, heating unit No. 2 10b and heating unit No. 3 10c, heating unit No. 2 10b is located between heating unit No. 1 10a and heating unit No. 3 10c, and heating unit No. 1 10a and the three heating units 10 may be arranged on the same side of heating unit No. 2 10b.

[0093] The lead-out area 12 of the first heating unit 10a can be stacked with the heating area 11 of the second heating unit 10b, the lead-out area 12 of the second heating unit 10b can be stacked with the heating area 11 of the third heating unit 10c, and the lead-out area 12 of the third heating unit 10c can be stacked with the heating area 11 of the second heating unit 10b.

[0094] In this embodiment, the lead-out area 12 and the heating area 11 of two adjacent heating units 10 are stacked, so that the space occupied by the lead-out area 12 can be covered by the heating area 11, thereby increasing the effective heating area and integration rate of the heating device 100. In combination with the independent controllable heating of each heating unit 10, the temperature uniformity of the heated part can be improved, and the temperature difference between the various areas of the heated part can be reduced.

[0095] According to some optional embodiments of the present invention, the heating unit 10 includes: a packaging film 13 , a heating wire 14 and a conducting wire 15 .

[0096] The packaging film 13 has a heating area 11 and a lead-out area 12. The heating wire 14 is provided on the packaging film 13 and is located in the heating area 11. The wire 15 is provided on the packaging film 13 and is located in the lead-out area 12, and the wire 15 is electrically connected to the heating wire 14.

[0097] That is to say, the heating unit 10 can be mainly composed of a packaging film 13, a heating wire 14 and a conductive wire 15, wherein the heating wire 14 and the conductive wire 15 can both be metal wires, and the resistance of the heating wire 14 can be greater than the resistance of the conductive wire 15, thereby increasing the heat generated by the heating wire 14 and reducing the heat generated by the conductive wire 15.

[0098] The packaging film 13 can be used as a carrier to carry the heating wire 14 and the wire 15. The area of ​​the packaging film 13 covered with the heating wire 14 can be formed as the heating area 11, and the area of ​​the packaging film 13 covered with the wire 15 can be formed as the lead-out area 12. When the heating area 11 and the lead-out area 12 are stacked, the packaging films 13 of multiple heating units 10 can be partially stacked.

[0099] The lead-out area 12 is adjacent to the heating area 11 , and the wire 15 can be disposed close to the heating wire 14 to reduce the length of the wire 15 , thereby reducing the resistance of the wire 15 and reducing the heat generated by the wire 15 .

[0100] like Figure 2 and Figure 3 As shown, the heating wires 14 can be arranged in parallel and connected in series on the packaging film 13, and each heating wire 14 can have two end points, which can be connected to two wires 15 in a one-to-one correspondence, and connected to the positive and negative electrodes of the external power supply through the two wires 15. The wires 15 can be designed on the packaging film 13 according to the shortest principle, and ensure that the wires 15 do not cross each other on the packaging film 13.

[0101] In this embodiment, the heating unit 10 includes a packaging film 13, a heating wire 14 and a conductive wire 15, which has the advantages of simple structure and high reliability. It is also beneficial to reduce the thickness of the heating unit 10, thereby reducing the volume of the heating device 100 and facilitating the installation and connection between the heating device 100 and the heated part.

[0102] In some optional embodiments, the packaging film 13 may be a polyimide packaging film 13, and the metal wire used as the heating wire 14 or the wire 15 may be made of a whole piece of metal foil by chemical etching or die cutting, and covered on the surface of the polyimide packaging film 13. The material of the metal wire may include brass or stainless steel. The line width of the heating wire 14 may be smaller than the line width of the wire 15, so that the power density of the heating area 11 is greater than the power density of the lead-out area 12.

[0103] Optionally, the power density of the lead-out area 12 is ≤ 0.07 W / cm 2 The power density of the heating area is 0.2W / cm 2 -0.7W / cm 2 between.

[0104] According to some other embodiments of the present invention, each heating zone 11 includes multiple heating sub-zones 111, each heating sub-zone 111 is provided with a corresponding heating wire 14, each heating sub-zone 111 is adjacent to the lead-out zone 12, and the heating wires 14 of the multiple heating sub-zones 111 are insulated from each other and are electrically connected to the corresponding wires 15 respectively.

[0105] Specifically, each heating zone 11 may be composed of two or more heating sub-zones 111 , that is, a plurality of heating sub-zones 111 may be separated on the packaging film 13 of a single heating unit 10 .

[0106] A heating wire 14 is provided in each heating sub-zone 111. The heating wires 14 in each heating sub-zone 111 are insulated from each other and can be led out by a pair of wires 16 to be electrically connected to an external power supply and an external controller, so that the heating wire 14 in each heating sub-zone 111 can be independently controlled. Therefore, the heating power of the heating wire 14 in any heating sub-zone 111 can be individually controlled by changing the voltage or current.

[0107] In addition, each heating sub-zone 111 is adjacent to the lead-out zone 12 , so that the heating wire 14 in each heating sub-zone 111 is directly connected to the wire 15 of the lead-out zone 12 .

[0108] In this embodiment, a single packaging film 13 can be provided with multiple heating sub-zones 111, and the heating wire 14 in each heating sub-zone 111 can be independently controlled, so that the heating unit 10 is divided into multiple independent structures, and the number of controllable areas is increased, so that the local temperature control of the heated part can be more accurately performed according to the real-time temperature of each part of the heated part, further improving the uniformity of the temperature of the heated part after heating, and reducing the temperature difference between the various areas of the heated part.

[0109] In some other embodiments, a heating zone 11 may also be provided on a single packaging film 13 , and the heating wires 14 provided in the heating zone 11 can be uniformly controlled, that is, multiple heating sub-zones 111 are no longer provided, which is conducive to simplifying the structure of the heating unit 10 .

[0110] In some specific embodiments of the present invention, the plurality of heating sub-areas 111 are arranged along a first direction, the heating area 11 and the lead-out area 12 are arranged along a second direction, and the first direction and the second direction intersect each other. Thus, the plurality of heating sub-areas 111 can be arranged along the lead-out area 12, so that each heating sub-area 111 can be led out through the lead-out area 12 nearby.

[0111] For the sake of convenience, the thickness direction of the heating unit 10 may be defined as the third direction. Optionally, the first direction, the second direction and the third direction may be perpendicular to each other.

[0112] like Figures 1 to 3 As shown, in a single heating unit 10, a plurality of heating sub-zones 111 arranged along a first direction may be provided on its packaging film 13, and the corresponding lead-out zone 12 may be arranged along a second direction with the heating zone 11, so that the lead-out zone 12 may be connected to each heating sub-zone 111, so that each wire 15 is conveniently connected to the heating wire 14 in the corresponding heating sub-zone 111, and the wire 15 in the lead-out zone 12 may extend approximately along the first direction.

[0113] In this embodiment, since the heat dissipation at both ends of the heated part in the first direction is greater than the heat dissipation in the middle section, a plurality of heating sub-areas 111 are arranged along the first direction, and the heating power of the heating areas 11 at both ends can be increased and the heating power of the heating area 11 in the middle section can be reduced by controlling the heating power of each heating area 11, thereby reducing the temperature difference at various locations of the heated part. In other words, when there is a temperature difference at various locations of the heated part in the first direction, the temperature difference can be eliminated by controlling the plurality of heating sub-areas 111 arranged along the first direction, thereby improving the temperature uniformity of the heated part.

[0114] According to some optional embodiments of the present invention, at least two heating units 10 are arranged along the second direction. Thus, when there is a temperature difference at various locations of the heated element in the second direction, the temperature difference can be eliminated by controlling the power of the plurality of heating units 10 arranged along the second direction, thereby improving the temperature uniformity of the heated element.

[0115] According to some other embodiments of the present invention, the heating device 100 includes three heating units 10, the three heating units 10 are arranged along the second direction, and each heating zone 11 includes three heating sub-zones 111 arranged along the first direction.

[0116] like Figures 1 to 3 As shown, the three heating units 10 are heating unit 10a, heating unit 10b and heating unit 10c. In the second direction, heating unit 10b is located between heating unit 10a and heating unit 10c, and the three heating units 10 can form a rectangular sheet structure.

[0117] like Figure 1 As shown, in the second direction, the lead-out area 12 of the first heating unit 10a and the lead-out area 12 of the third unit face each other, and in the second direction, the heating area of ​​the first heating unit 10a and the heating area of ​​the third unit are far away from each other. The lead-out area 12 of the first heating unit 10a and the lead-out area 12 of the third unit are both stacked below the heating area of ​​the second heating unit 10b, and the lead-out area 12 of the second heating unit 10b is stacked above the third heating unit 10c, and the heating areas of the three heating units 10 can completely cover the entire rectangular area space.

[0118] The heating area 11 of each heating unit 10 is composed of three heating sub-areas 111, that is, the heating device 100 includes a total of nine heating sub-areas 111, and the nine heating sub-areas 111 can be in a tic-tac-toe shape. The three heating sub-areas 111 in each heating unit 10 can be a first sub-area 111a, a second sub-area 111b, and a third sub-area 111c, respectively, and the first sub-area 111a, the second sub-area 111b, and the third sub-area 111c are arranged in sequence along the first direction.

[0119] The first sub-area 111a and the third sub-area 111c of the first heating unit 10a and the first sub-area 111a and the third sub-area 111c of the third heating unit 10c can correspond to the four corners of the part to be heated, the second sub-area 111b of the first heating unit 10a, the second sub-area 111b of the third heating unit 10c and the first sub-area 111a and the third sub-area 111c of the second heating unit 10b can correspond to the four edges of the part to be heated, and the second sub-area 111b of the second heating unit 10b can correspond to the central area of ​​the part to be heated. Thus, by controlling the heating power of each heating sub-area 111, the temperature of the four corners, four edges and the central area of ​​the part to be heated can be controlled.

[0120] In some specific embodiments of the utility model, in the first direction, multiple wires 15 of each heating unit 10 are led out from the same end of the heating unit 10, thereby facilitating the connection of the heating wires 14 in the multiple heating zones 11 in the heating unit 10 with an external power supply and an external controller through a unified port, which helps to reduce the number of ports.

[0121] like Figure 2 and Figure 3 As shown, the plurality of wires 15 inside the first heating unit 10a, the second heating unit 10b and the third heating unit 10c can be led out from the left end.

[0122] According to some optional embodiments of the utility model, in a first direction, multiple wires 15 of multiple heating units 10 are led out from the same end of the heating device 100, thereby allowing the ports on the heating device 100 for connecting the various heating wires 14 to be arranged at the same end of the heating device 100, thereby facilitating the installation of the heating device 100.

[0123] According to some other embodiments of the present invention, the heating device 100 further includes a lead-out assembly 20. The lead-out assembly 20 is connected to the corresponding wire 15, and the lead-out assembly 20 is located outside the lead-out area 12.

[0124] Specifically, the lead-out assembly 20 can lead the connection port of the heating wire 14 to the outer surface of the heating device 100, so as to facilitate electrical connection with an external power source and a controller. The lead-out assembly 20 is arranged outside the lead-out area 12 to avoid overlapping of the lead-out assembly 20 and the heating area 11, thereby avoiding that the lead-out assembly 20 affects the heating effect.

[0125] It should be noted that the lead-out assemblies 20 of the conductive wires 15 of the plurality of heating units 10 may be adjacent to each other in the second direction, or may be spaced apart in the second direction, which is not limited herein.

[0126] For example, Figure 1As shown, the lead-out assembly 20 corresponding to the No. 1 heating unit 10a can be spaced apart from the lead-out assemblies 20 of the other two heating units 10 in the second direction, so that the wire 15 in the No. 1 heating unit 10a can be arranged close to its heating wire 14, which is beneficial to reducing the length of the wire 15 and thus reducing the resistance and heating power of the wire 15.

[0127] The lead-out components 20 corresponding to the second heating unit 10b and the third heating unit 10c can be arranged adjacent to each other in the second direction, thereby reducing the number of external connectors and reducing their size, making it easier for the heating device 100 to be connected to an external power source and a controller.

[0128] In some other embodiments, the lead-out component 20 corresponding to the first heating unit 10a may also be close to the other two lead-out components 20 to further reduce the number of external connectors and reduce their size, making it easier to connect the heating device 100 to an external power supply and controller.

[0129] Optionally, the lead-out assembly 20 may include a solder joint protection silicone 21, a lead 22, and a terminal. The lead 22 may be fixed to the wire 15 on the packaging film 13 by soldering, and the solder joint surface may be covered with the solder joint protection silicone 21. The lead 22 may be fixed to the terminal 23, and the terminal 23 may be exposed from the outer surface of the heating device 100.

[0130] In some specific embodiments of the present invention, among the three heating units 10 , the area of ​​the heating zone 11 of the middle heating unit 10 is larger than the areas of the heating zones 11 of the heating units 10 at both ends.

[0131] In other words, the area of ​​the heating zone 11 of the first heating unit 10a is S1, the area of ​​the heating zone 11 of the second heating unit 10b is S2, and the area of ​​the heating zone 11 of the third heating unit 10c is S3, S1>S2 and S1>S3.

[0132] For a larger-sized battery cell assembly 200, the temperature at the edge is lower than that at the center, and the area of ​​the lower temperature region is usually smaller than the area of ​​the higher temperature region in the center. Therefore, in the second direction, the heating device 100 of this embodiment can better independently control the heating of the smaller low-temperature region at the edge and the larger high-temperature region in the center, thereby reducing the temperature difference at various parts of the battery cell assembly 200 and improving the temperature uniformity effect.

[0133] Optionally, S2=S3, the shape and area of ​​the heating zone 11 of the first heating unit 10a may be the same as the shape and area of ​​the heating zone 11 of the third heating unit 10c.

[0134] In some optional embodiments, among the three heating sub-zones 111 of each heating zone 11 , the area of ​​the middle heating sub-zone 111 is larger than the areas of the heating sub-zones 111 at both ends.

[0135] Specifically, in each heating unit 10, the area of ​​the second sub-area 111b is larger than the area of ​​the first sub-area 111a, and the area of ​​the second sub-area 111b is larger than the area of ​​the third sub-area 111c. Therefore, in the first direction, the heating device 100 of this embodiment can better independently control the heating of the low-temperature area with a smaller area at the edge and the high-temperature area with a larger area in the center, reduce the temperature difference of each part of the battery cell assembly 200, and help improve the temperature uniformity effect.

[0136] Optionally, in each heating unit 10 , the area of ​​the first sub-region 111 a and the area of ​​the third sub-region 111 c may be the same.

[0137] According to some other embodiments of the present invention, in the second direction, the lead-out area 12 of the heating unit 10 located at both ends of at least two heating units 10 is located at one end of the corresponding heating area 11 close to the center of the heating device 100.

[0138] Specifically, the lead-out zone 12 of the first heating unit 10a can be located at one end of its own heating zone 11 toward the second heating unit 10b, and the lead-out zone 12 of the third heating unit 10c can be located at one end of its own heating zone 11 toward the second heating unit 10b.

[0139] When the poles of the battery cell are arranged at both ends of the second direction, there will be a temperature difference between the position close to the pole on the battery cell and the central area of ​​the battery cell. In this embodiment, the lead-out areas 12 of the heating units 10 at both ends are arranged close to each other, so that the heating areas 11 of the two heating units 10 can cover the position close to the pole on the battery cell, and independently control the heating at this location, thereby improving the temperature equalization effect and reducing the temperature difference between the position close to the pole on the battery cell and the central area of ​​the battery cell.

[0140] In some specific embodiments of the present invention, the heating device 100 also includes two insulating layers 30, and at least two heating units 10 are arranged between the two insulating layers 30, thereby avoiding short circuit of the heating unit 10. At the same time, since the structure of the heating unit 10 is very thin, the two insulating layers 30 sandwich the heating unit 10 in the middle, which can support the heating unit 10 and prevent the heating unit 10 from shifting in the thickness direction of itself.

[0141] Optionally, at least two heating units 10 and two layers of insulating plates can be formed by hot pressing, and the insulating layer 30 can be plastic. The insulating layer 30 can be deformed during the pressing process to fill the height difference area formed in the third direction after multiple heating units 10 are partially stacked.

[0142] Optionally, the insulating layer 30 may be an upper epoxy resin glass fiber board.

[0143] The embodiment of the present utility model further provides a battery system 400, which includes the heating device 100 according to any of the above embodiments.

[0144] Among them, the battery system 400 can also include a battery cell assembly 200, the heating device 100 can cover a large surface of the battery cell assembly 200, and the heating device 100 and the battery cell assembly 200 can be connected through a thermally conductive structural adhesive 300. The thermally conductive structural adhesive 300 has good thermal conductivity and connection strength, which can not only fix the heating device 100 and the battery cell assembly 200, but also guide the heat released by the heating device 100 to the battery cell assembly 200, and can also play a certain role in temperature equalization.

[0145] Since the heating device 100 according to the embodiment of the utility model has the above-mentioned technical effects, the battery system 400 according to the embodiment of the utility model also has the corresponding technical effects, that is, when the overall size of the heating device 100 is constant, the area covered by the heating zone 11 of the heated component can be increased, which is beneficial to improving the integration rate of the heating device 100. In conjunction with the independent and controllable heating of each heating unit 10, it is also beneficial to improve the temperature uniformity of the heated component, reduce the temperature difference between the various areas of the heated component, improve the charging and discharging efficiency and cycle life of the battery system 400, and reduce the aging speed and safety risks of the battery system 400.

[0146] The battery system 400 of this embodiment can be applied to a variety of electrical equipment, which may include but are not limited to vehicles and energy storage stations.

[0147] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A heating device, It is characterized in that include: At least two heating units, each of which has a heating area and a lead-out area, the power density of the heating area is greater than the power density of the lead-out area, and the lead-out area of ​​at least one of the heating units is stacked and insulated from at least another heating unit.

2. The heating device according to claim 1, It is characterized in that The lead-out region of at least one of the heating units is stacked with the heating region of at least another of the heating units.

3. The heating device according to claim 1, It is characterized in that The lead-out region of at least one of the heating units completely overlaps with the projection of the heating region of at least another of the heating units along the thickness direction of the heating units.

4. The heating device according to claim 1, It is characterized in that The projections of the heating zone of at least one of the heating units and the heating zone of at least another of the heating units along the thickness direction of the heating units do not overlap.

5. The heating device according to claim 1, It is characterized in that The two adjacent heating units are a first heating unit and a second heating unit, the lead-out area of ​​the first heating unit is stacked with the heating area of ​​the second heating unit, and / or the lead-out area of ​​the second heating unit is stacked with the heating area of ​​the first heating unit.

6. The heating device according to any one of claims 1 to 5, It is characterized in that The heating unit comprises: A packaging film, wherein the packaging film has the heating area and the lead-out area; A heating wire, the heating wire is arranged on the packaging film and located in the heating area; A conducting wire is arranged on the packaging film and located in the lead-out area, and the conducting wire is electrically connected to the heating wire.

7. The heating device according to claim 6, It is characterized in that Each of the heating zones comprises a plurality of heating sub-zones, each of the heating sub-zones is provided with a corresponding heating wire, each of the heating sub-zones is adjacent to the lead-out zone, and the heating wires of the plurality of heating sub-zones are insulated from each other and are respectively electrically connected to the corresponding conducting wires.

8. The heating device according to claim 7, It is characterized in that The plurality of heating sub-areas are arranged along a first direction, the heating area and the lead-out area are arranged along a second direction, and the first direction and the second direction intersect.

9. The heating device according to claim 8, It is characterized in that At least two of the heating units are arranged along the second direction.

10. The heating device according to claim 8, It is characterized in that The heating device includes three heating units, the three heating units are arranged along the second direction, and each heating zone includes three heating sub-zones arranged along the first direction.

11. The heating device according to claim 8, It is characterized in that In the first direction, the plurality of conducting wires of each heating unit are led out from the same end thereof.

12. The heating device according to claim 8, It is characterized in that In the first direction, the plurality of wires of the plurality of heating units are led out from the same end of the heating device.

13. The heating device according to claim 6, It is characterized in that Also includes: A lead-out component is connected to the corresponding wire and is located outside the lead-out area.

14. The heating device according to claim 10, It is characterized in that Among the three heating units, the area of ​​the heating zone of the middle heating unit is larger than the areas of the heating zones of the heating units at both ends.

15. The heating device according to claim 10, It is characterized in that In the three heating sub-zones of each heating zone, the area of ​​the middle heating sub-zone is larger than the areas of the heating sub-zones at both ends.

16. The heating device according to claim 9, It is characterized in that In the second direction, the lead-out areas of the heating units located at both ends of at least two of the heating units are located at one end of the corresponding heating area close to the center of the heating device.

17. The heating device according to claim 1, It is characterized in that Also includes: There are two insulating layers, and at least two of the heating units are arranged between the two insulating layers.

18. A battery system, It is characterized in that include: The heating device according to any one of claims 1 to 17.

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