A battery heating film and battery

Abstract

This utility model belongs to the field of battery technology and discloses a battery heating film and a battery. The battery heating film is connected to a battery cell. The heating film includes a heating film body, a conductive element, and an insulating film. The conductive element is electrically connected to the heating film body for conductive connection to an external power source. The insulating film covers the surface of the heating film body in the thickness direction. The heating film body has connection holes, and the insulating film has connection portions corresponding to the connection holes. The connection portions on both sides of the heating film body in the thickness direction are fixedly connected to limit the relative position of the insulating film and the heating film body. Thus, through the conductive element's conductive connection to an external power source, the heating film body is energized and heated, enabling uniform heating of the battery cell surface, saving on the need for a heat spreader, and simplifying the structure of the battery heating film.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery heating film and a battery. Background Technology

[0002] A battery is a device that converts chemical energy into electrical energy. In low-temperature environments, the battery's discharge capacity and discharge amount are limited. Furthermore, if a battery operates at low temperatures for a long time, its lifespan will be shortened. To enable batteries to operate in a suitable temperature environment, heating technology is usually used to achieve a short-term increase in the temperature of the battery's operating environment.

[0003] Heating technology is mainly divided into external heating and internal heating. Internal heating requires the battery itself to be in a charging or discharging state, while external heating usually uses a thin copper sheet that is powered to heat the battery. The heating position and heating power are controlled by controlling the wiring of the copper sheet. Since there is a large temperature difference between the position where the copper sheet is set and the position where the copper sheet is not set on the battery, the temperature of some areas of the battery is too high or too low, which affects the battery performance. Therefore, an additional temperature equalization plate is required to achieve a uniform temperature distribution, making the external heating structure more complex. Utility Model Content

[0004] The purpose of this invention is to provide a battery heating film and a battery to solve the problem of the complex external heating structure of the battery.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, a battery heating film is provided for connection to a battery cell. The battery heating film includes: a heating film body and a conductive element, the conductive element being electrically connected to the heating film body for conductive connection to an external power source; and an insulating film covering the surface of the heating film body in the thickness direction. The heating film body has a connection hole, and the insulating film has a connection portion corresponding to the position of the connection hole. The connection portions on both sides of the heating film body in the thickness direction are fixedly connected to limit the relative position of the insulating film and the heating film body.

[0007] Preferably, the conductive element is a conductive strip, and two conductive strips are provided. The two conductive strips are located at both ends of the heating film body and are electrically connected to the heating film body.

[0008] Preferably, the heating film body extends along a first direction, the conductive strip extends along a second direction, and one end of the conductive strip protrudes from the heating film body; the first direction is the length direction of the battery cell, and the second direction is the width direction of the battery cell.

[0009] Preferably, a plurality of connection holes are provided, and the plurality of connection holes are spaced apart on the heating film body.

[0010] Preferably, the array of multiple connection holes is distributed on the heating film body.

[0011] Preferably, the conductive element has a conductive layer made of conductive material on the side facing the heating film body, and the conductive layer is connected to the heating film body.

[0012] Preferably, the conductive layer is made of silver paste material, or the conductive layer is made of conductive adhesive material.

[0013] Preferably, the thickness of the heating film body is in the range of 20μm-120μm.

[0014] In a second aspect, a battery includes at least one of the said battery cells and a battery heating film as described above, the heating film body being connected to the battery cell.

[0015] Preferably, multiple battery cells are provided, and the heating film body is disposed between adjacent battery cells, with both sides of the heating film body connected to the adjacent battery cells respectively.

[0016] The beneficial effects of this utility model are:

[0017] A battery heating film is connected to a battery cell. The battery heating film includes a heating film body, a conductive element, and an insulating film. The conductive element is electrically connected to the heating film body for conductive connection with an external power source. The insulating film covers the surface of the heating film body in the thickness direction. The heating film body has a connection hole, and the insulating film has a connection part at the position corresponding to the connection hole. The connection parts on both sides of the heating film body in the thickness direction are fixedly connected to limit the relative position of the insulating film and the heating film body.

[0018] In this way, the conductive component is connected to an external power source to energize the heating film body, causing it to heat up and then heat the battery cell. Since both the heating film body and the insulating film can be tightly bonded to the battery cell, the heating film body can achieve a combination of temperature equalization and heating, saving the need for temperature equalization plates. Furthermore, the heating power can be adjusted by changing the thickness of the heating film body and the voltage applied to it by the conductive component, simplifying the overall structure of the battery heating film and reducing assembly difficulty. The insulating film and the heating film body are fixedly connected through a connecting part, which facilitates a tight connection between the insulating film and the heating film body, enhances the heating effect and the insulation performance between the heating film body and the battery cell, and improves the reliability and safety of the battery. Attached Figure Description

[0019] Figure 1 This is an exploded view of the battery heating film in one embodiment of the present invention;

[0020] Figure 2This is a partial cross-sectional view of the battery heating film in one embodiment of the present invention;

[0021] Figure 3 This is a front view of one embodiment of the present invention, intended to show the heating film body and the conductive strip;

[0022] Figure 4 This is a schematic diagram of the battery structure in one embodiment of the present invention.

[0023] In the picture:

[0024] 1. Heating film body; 11. Connecting hole; 2. Conductive strip; 3. Insulating film; 31. Connecting part; 4. Battery cell; X, first direction; Y, second direction. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0026] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0029] Example 1

[0030] See Figures 1 to 4 This utility model provides a battery heating film that is connected to a battery cell 4. The battery heating film includes a heating film body 1, a conductive element, and an insulating film 3. The conductive element is electrically connected to the heating film body 1 and is used for conductive connection with an external power source. The insulating film 3 is disposed on the surface of the heating film body 1 in the thickness direction. The heating film body 1 has a connection hole 11. The insulating film 3 is provided with a connection part 31 at the position corresponding to the connection hole 11. The connection parts 31 on both sides of the heating film body 1 in the thickness direction are fixedly connected to limit the relative position of the insulating film 3 and the heating film body 1.

[0031] In this embodiment, the heating film body 1 is made of graphite material, and the insulating film 3 is made of PI (Polyimide) material. There are two insulating films 3, which cover two surfaces of the heating film body 1 in the thickness direction. Each of the two insulating films 3 has a connecting part 31 at the position corresponding to the connecting hole 11, and the connecting parts 31 on both sides of the same connecting hole 11 are fixedly connected to achieve a fixed connection between the two insulating films 3 and the heating film body 1 between the insulating films 3. The combined insulating film 3 and the heating film body 1 are laid on the surface of the battery cell 4 to externally heat the battery cell 4.

[0032] In this way, the conductive component can be connected to an external power source, energizing the heating film body 1 and generating ohmic heat to heat the battery cell 4. Since both the heating film body 1 and the insulating film 3 are thin film structures, and the heating film body 1 made of graphite material has high thermal conductivity, when it is laid on the surface of the battery cell 4, it can combine temperature equalization and heating, saving the arrangement of temperature equalization sheets. Furthermore, the heating power can be adjusted by adjusting the thickness of the heating film body 1 and the voltage applied to the heating film body 1 by the conductive component, simplifying the overall structure of the battery heating film and reducing assembly difficulty. The insulating films 3 located on both sides of the heating film body 1 are connected through the connecting part 31 and the connecting hole 11, which can limit the relative position of the insulating film 3 and the heating film body 1, thereby achieving a tight and fixed connection between the insulating film 3 and the heating film body 1, enhancing the insulation effect of the insulating film 3 on the heating film body 1, and improving the reliability and safety of the battery.

[0033] It is understandable that the materials of the heating film body 1 and the insulating film 3 can be adjusted according to actual needs, so as to enable the heating film body 1 to heat the battery cell 4 evenly and to make the heating film body 1 and the battery cell 4 insulatedly connected. Further details will not be listed here.

[0034] See Figure 2 In some embodiments, the connecting portions 31 located on both sides of the connecting hole 11 are bonded together.

[0035] In this embodiment, the surfaces of the connecting portions 31 located on both sides of the connecting hole 11 that are close to each other are coated with adhesive. By bonding the connecting portions 31 on both sides in the connecting hole 11 and heating the bonding area, the insulating film 3 on both sides of the heating film body 1 and the heating film body 1 can be fixedly connected at the connecting hole 11.

[0036] In this way, by tightly fixing the insulating films 3 on both sides of the heating film body 1, the connection strength between the connecting parts 31 is improved, which can further limit the relative position of the heating film body 1 and the insulating film 3, avoid the insulating film 3 or the heating film body 1 from shifting during the assembly process, reduce the assembly difficulty, improve the stability and reliability of the battery heating film and the battery, and facilitate uniform temperature distribution to achieve uniform heating of the battery cell 4.

[0037] It is understandable that the connecting part 31 can also be a protruding structure and is fitted inside the connecting hole 11. The connection method of the connecting parts 31 located on both sides of the connecting hole 11 can be adjusted according to actual needs, which will not be elaborated here.

[0038] See Figure 1 In some embodiments, the conductive element is a conductive strip 2, and two conductive strips 2 are provided. The two conductive strips 2 are provided at both ends of the heating film body 1 and are electrically connected to the heating film body 1.

[0039] In this embodiment, the conductive strip 2 is made of copper material, and the conductive strip 2 is fixedly connected to the heating film body 1, with the two conductive strips 2 respectively disposed at both ends on the same side of the heating film body 1.

[0040] Thus, by placing the two conductive strips 2 at both ends of the heating film body 1, the heating film body 1 can be heated evenly under the action of current, avoiding excessively high or low temperatures in local areas of the battery and improving battery performance.

[0041] It is understandable that the conductive component can also be a conductive wire or other structure, as long as it can achieve electrical connection with the heating film body 1 and heat up the heating film body 1. No further examples will be listed here.

[0042] See Figure 3 and Figure 4In some embodiments, the heating film body 1 extends along the first direction X, the conductive strip 2 extends along the second direction Y, and one end of the conductive strip 2 protrudes from the heating film body 1; the first direction X is the length direction of the battery cell 4, and the second direction Y is the width direction of the battery cell 4.

[0043] In this embodiment, the length of the conductive strip 2 is greater than the width of the heating film body 1. The size of the heating film body 1 and the size of the insulating film 3 are adapted to the surface size of the battery cell 4 in the thickness direction. That is, when the heating film body 1 and the insulating film 3 are laid on the surface of the battery cell 4, one end of the conductive strip 2 protrudes from the battery cell 4 to facilitate connection with the battery or external power source, and the other end is flush with the battery cell 4. The side of the conductive strip 2 is flush with the side of the heating film body 1.

[0044] Thus, the heating film body 1 covered with the insulating film 3 can uniformly heat the surface of the battery cell 4, avoiding large temperature differences at different locations on the surface of the battery cell 4 due to the difference in size between the heating film body 1 and the surface of the battery cell 4, thereby improving the heating efficiency and stability of the heating film body 1; the end of the conductive strip 2 protrudes from the battery cell 4, which facilitates connection with the battery or external power source, avoids assembly interference with the insulating film body 3 and the battery cell 4, and improves the stability and safety of the battery heating film.

[0045] It is understandable that the position of the conductive strip 2 can be adjusted according to actual needs, as long as it can ensure that the heating film body 1 heats up evenly after being energized, which will not be elaborated here.

[0046] See Figure 3 In some embodiments, multiple connection holes 11 are provided, and the multiple connection holes 11 are spaced apart on the heating film body 1.

[0047] In this embodiment, multiple connecting parts 31 are provided to enable the insulating films 3 located on both sides of the heating film body 1 to be fixedly connected at multiple points and to limit the relative positions of the heating film body 1 and the insulating films 3.

[0048] Thus, by setting multiple connecting parts 31, the connection strength and stability between the insulating film 3 and the heating film body 1 can be enhanced, achieving a tight fit between the insulating film 3 and the heating film body 1, and enabling heat to be evenly transferred to the surface of the battery cell 4, thereby improving the reliability of the battery heating film. Furthermore, by adjusting the density and aperture of the connecting holes 11, the heating power can be adjusted accordingly, so that the battery can operate in a suitable temperature environment, and the heating power of the battery heating film can be adjusted according to actual needs.

[0049] It is understandable that the number and location of the connection holes 11 can be adjusted according to actual needs, and will not be elaborated here.

[0050] See Figure 3In some embodiments, multiple connection holes 11 are arrayed on the heating film body 1.

[0051] In this embodiment, multiple connecting holes 11 are arranged at equal intervals along the first direction X and the second direction Y.

[0052] In this way, the connection between the heating film body 1 and the insulating film 3 can be evenly distributed, and the connection strength between the heating film body 1 and the insulating film 3 in each area can be consistent. This avoids problems such as displacement or warping between the heating film body 1 and the insulating film 3 due to local weak connection, improves the connection stability between the heating film body 1 and the insulating film 3, allows the heating film body 1 to be tightly attached to the surface of the battery cell 4, simplifies the overall structure of the battery heating film, and allows the resistance of the heating film body 1 to be adjusted by adjusting the spacing of the array, thereby adjusting the heating power so that the battery heating film can adapt to different needs.

[0053] It is understood that the multiple connecting holes 11 can also be arranged in a straight line, a curve, an S-shape, etc. In this embodiment, the array distribution of multiple connecting holes 11 can make the temperature distribution of the heating film body 1 more uniform. The arrangement of the connecting holes 11 can be adjusted according to actual needs, and will not be listed in detail here.

[0054] See Figure 3 In some embodiments, a conductive layer (not shown in the figure) made of a conductive material is provided on the side of the conductive element facing the heating film body 1, and the conductive layer is connected to the heating film body 1. Further, the conductive layer is made of silver paste material, or the conductive layer is made of conductive adhesive material.

[0055] In this embodiment, the conductive strip 2 is fixedly connected to the heating film body 1 through the conductive layer.

[0056] In this way, the conductive layer can improve the conductivity at the connection between the conductive strip 2 and the heating film body 1, and make the conductive strip 2 and the heating film body 1 tightly connected, reducing contact resistance and reducing energy loss during transmission, thereby improving the heating efficiency of the heating film body 1. The conductive layer can make the current evenly distributed to all parts of the heating film body 1, making the temperature distribution on the surface of the cell 4 more uniform, avoiding excessively high or low temperatures in local areas, and improving the reliability and safety of the battery.

[0057] Understandably, the material of the conductive layer can be adjusted according to actual needs, and will not be listed in detail here.

[0058] See Figure 3 In some embodiments, the thickness of the heating film body 1 ranges from 20 μm to 120 μm.

[0059] In this embodiment, the thickness of the heating film body 1 can be any value between 20μm and 120μm or any range between two values, such as 20μm, 40μm, 60μm, 80μm, 100μm, 120μm, etc.

[0060] Thus, by limiting the thickness of the heating film body 1, the heating film body 1 can have high flexibility while ensuring good heating performance, making it easy for the heating film body 1 to be tightly attached to the surface of the battery cell 4, thereby improving the reliability of the battery heating film; and it also makes it easy for the insulating film 3 to be fixedly connected to the heating film body 1 through the connecting part 31, reducing assembly difficulty and simplifying the overall structure of the battery heating film.

[0061] It is understandable that the thickness of the heating film body 1 cannot be too small. If it is too small, the structural strength of the heating film body 1 will be poor, which will not be conducive to the connection with the insulating film 3. It may also cause problems such as cracking and damage to the heating film body 1 during assembly and use, thereby affecting the heating efficiency and the stability of the conductivity. The thickness of the heating film body 1 cannot be too large either. If it is too large, the thermal response speed of the heating film body 1 will be slower, delaying the heating effect on the battery cell 4. In addition, a thicker heating film body 1 has poor flexibility and is difficult to stably adhere to the surface of the battery cell 4, which is not conducive to uniform heating. The thickness of the heating film body 1 can be adjusted according to the required strength, flexibility and resistance value, which will not be listed in detail here.

[0062] See Figure 3 and Figure 4 The present invention also provides a battery, including at least one battery cell 4 and a battery heating film, wherein the heating film body 1 is connected to the battery cell 4.

[0063] Furthermore, in some embodiments, multiple battery cells 4 are provided, and the heating film body 1 is disposed between adjacent battery cells 4, with both sides of the heating film body 1 connected to the adjacent battery cells 4 respectively.

[0064] In this embodiment, a battery heating film is provided between every two adjacent battery cells 4. The insulating film 3 is connected to the surface of the battery cell 4 in the thickness direction, so that the two sides of the battery heating film can be tightly attached to the two adjacent surfaces of the adjacent battery cell 4. The battery cell can be an all-solid-state battery, a semi-solid-state battery, a liquid battery, etc.

[0065] In this way, the heat generated by the heating film body 1 can be quickly and evenly transferred to the surface of the adjacent battery cell 4, improving the heating efficiency and temperature uniformity of the battery in low-temperature environments, and accurately heating each battery cell 4 to avoid temperature differences between battery cells 4 due to uneven heat transfer, thereby improving the stability and safety of the battery; the insulating film 3 enables the heating film body 1 and the battery cell 4 to achieve an insulating connection, reducing the risk of short circuit.

[0066] It is understandable that when there is one battery cell 4, there can be one set of battery heating film, which is set on one side of the thickness direction of the battery cell 4. Alternatively, there can be two sets of battery heating film, which are set on both sides of the thickness direction of the battery cell 4. When there are multiple battery cells 4, the multiple sets of battery heating film can be set only between adjacent battery cells 4, or a set of battery heating film can be set on the side of the two outermost battery cells 4 facing the outside, so that both sides of each battery cell 4 are connected to the battery heating film, thereby achieving uniform heating of the battery cell 4.

[0067] See Figure 4 In some embodiments, adjacent heating film bodies 1 are connected by conductive elements.

[0068] In some embodiments, the battery heating film is provided in two sets, and the conductive strips 2 corresponding to the heating film bodies 1 in the two sets of battery heating films are connected to each other. Alternatively, in other embodiments, the battery heating film is provided in three or more sets, and adjacent heating film bodies 1 are connected in series or in parallel through their corresponding conductive strips 2.

[0069] In this way, not only can the resistance of the heating film body 1 be adjusted by adjusting the thickness of the heating film body 1 and the aperture and spacing of the connecting holes 11, but also the heating efficiency of the battery heating film can be flexibly adjusted as needed by connecting adjacent heating film bodies 1 in series or in parallel, so as to adapt it to different needs.

[0070] It is understandable that adjacent heating film bodies 1 can also be set independently, that is, neither in parallel nor in series, so that a single heating film body 1 can be adjusted. The connection method between multiple heating film bodies 1 can be adjusted according to actual needs, which will not be elaborated here.

[0071] Example 2

[0072] In Embodiment 2, the same or corresponding components as in Embodiment 1 are referred to using the same reference numerals as in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described.

[0073] In some embodiments, two insulating films 3 in a group of battery heating films are connected to at least one side of the heating film body 1 in the thickness direction. In this embodiment, the two insulating films 3 are respectively connected to two side of the heating film body 1 in the thickness direction, and the two insulating films 3 are integrally formed to cover the heating film body 1.

[0074] In this way, the two insulating films 3 are integrally formed, which can reduce the assembly difficulty, prevent the two insulating films 3 from shifting during the assembly process, improve the stability and reliability of the battery heating film, and simplify the overall structure of the battery heating film.

[0075] In some embodiments, the two insulating films 3 may also overlap on their respective sides to limit the relative position of the insulating film 3 and the heating film body 1, improve the connection stability between the insulating film 3 and the heating film body 1, and achieve a tight fixed connection.

[0076] It is understandable that the setting position and connection method of the insulating film 3 can be adjusted according to actual needs, as long as it can limit the position of the heating film body 1 and make the heating film body 1 insulated from the battery cell 4. No further details will be provided here.

[0077] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery heating film, characterized in that, Connected to the battery cell (4), the battery heating film includes: A heating film body (1) and a conductive element, wherein the conductive element is electrically connected to the heating film body (1) and is used for conductive connection with an external power source; An insulating film (3) is provided, which covers the surface of the heating film body (1) in the thickness direction. The heating film body (1) has a connecting hole (11). The insulating film (3) has a connecting part (31) at the position corresponding to the connecting hole (11). The connecting parts (31) on both sides of the heating film body (1) in the thickness direction are fixedly connected to limit the relative position of the insulating film (3) and the heating film body (1).

2. The battery heating film according to claim 1, characterized in that, The conductive element is a conductive strip (2), and there are two conductive strips (2). The two conductive strips (2) are disposed at both ends of the heating film body (1) and are electrically connected to the heating film body (1).

3. The battery heating film according to claim 2, characterized in that, The heating film body (1) extends along the first direction (X), the conductive strip (2) extends along the second direction (Y), and one end of the conductive strip (2) protrudes from the heating film body (1); The first direction (X) is the length direction of the battery cell (4), and the second direction (Y) is the width direction of the battery cell (4).

4. The battery heating film according to claim 1, characterized in that, The connection holes (11) are provided in multiple ways, and the multiple connection holes (11) are spaced apart on the heating film body (1).

5. The battery heating film according to claim 4, characterized in that, Multiple connection holes (11) are arrayed on the heating film body (1).

6. The battery heating film according to claim 1, characterized in that, The conductive element has a conductive layer made of conductive material on the side facing the heating film body (1), and the conductive layer is connected to the heating film body (1).

7. The battery heating film according to claim 6, characterized in that, The conductive layer is made of silver paste material, or the conductive layer is made of conductive adhesive material.

8. The battery heating film according to claim 1, characterized in that, The thickness of the heating film body (1) ranges from 20μm to 120μm.

9. A battery, characterized in that, It includes at least one of the battery cells (4) and a battery heating film as described in any one of claims 1-8, wherein the heating film body (1) is connected to the battery cell (4).

10. The battery according to claim 9, characterized in that, Multiple battery cells (4) are provided, and the heating film body (1) is provided between adjacent battery cells (4). The two sides of the heating film body (1) are respectively connected to the adjacent battery cells (4).

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