Battery module and heating film thereof

Abstract

The application relates to a battery module and a heating film thereof, the battery module comprising a plurality of battery cells and a steel binding belt, the steel binding belt binding the battery cells together, the battery module further comprising a heating film, the heating film comprising a film body and a heating wire, the heating wire being embedded in the film body, the heating film comprising an overcurrent section and a heating section, the overcurrent section being used for being mounted on the outer side of the steel binding belt, and the heating section being used for being pasted on the side of the battery module and used for heating the battery cells; the heating section is provided with at least two, and the overcurrent section is between the two adjacent heating sections, the overcurrent section is provided with a positioning groove used for positioning cooperation with the steel binding belt, and the cross-sectional area of the part of the heating wire in the overcurrent section is greater than that of the part of the heating wire in the heating section. Compared with the prior art, the contact area of the heating film and the battery cells is increased, and the heating capacity of the heating film on the battery cells is improved.

Description

TECHNICAL FIELD

[0001] The application relates to a battery module and a heating film thereof, and belongs to the field of power batteries. BACKGROUND

[0002] The rate of charging and discharging of a battery module is closely related to temperature, and if the temperature is not appropriate under relatively cold temperature conditions, the performance of an electric vehicle and the service life of the battery will be seriously affected.

[0003] The heating mode of the battery module on the market at present is mainly external heating, and the main setting mode is to increase a rectangular heating film piece on the side of the module, specifically, the heating film piece is pasted between the upper and lower two binding bands of the module.

[0004] However, the width of the rectangular heating film piece is small, the heating area is small, and the heating film piece is located between the two steel binding bands, so it can only cover half of the area of each side of the battery cell, the heating capacity is insufficient, and the heating film piece is easily caused. The temperature rising rate of each position of the battery cell is different, resulting in uneven temperature of the battery cell. SUMMARY

[0005] The application aims to provide a heating film of a battery module to solve the technical problem of a small heating area of the heating film of the battery module in the prior art. The application also provides a battery module to solve the technical problem of a small heating area of the heating film of the battery module in the prior art.

[0006] To achieve the above-mentioned purpose, the technical scheme of the heating film of the battery module provided by the application is as follows: a heating film of a battery module, comprising a film body and a heating wire, the heating wire is embedded in the film body, the heating film comprises a flow passage section and a heating section, the flow passage section is used for being installed on the outer side of a steel binding band of the battery module, and the heating section is used for being pasted on the side of the battery module and used for heating battery cells of the battery module; at least two heating sections are provided, the flow passage section is located between the two adjacent heating sections, the flow passage section is provided with a positioning groove used for positioning cooperation with the steel binding band, and the cross-sectional area of the part of the heating wire in the flow passage section is greater than the cross-sectional area of the part of the heating wire in the heating section.

[0007] The heating film of the battery module provided by the application has the beneficial effects that the cross-sectional area of the heating wire in the flow passage section of the film body is greater than the cross-sectional area of the heating wire in the heating section, so that the power of the heating wire in the flow passage section is small, the heating capacity is small, the flow passage section is installed on the side of the steel binding band in the battery module through the positioning groove, the flow passage section is located between the two adjacent heating sections, so that the heating section covers the side of the battery cell in the battery module across the flow passage section, compared with the prior art, the contact area of the heating film and the battery cell is increased, and the heating capacity of the heating film on the battery cell is improved.

[0008] As a further improvement, the flow passage section is provided with two.

[0009] The beneficial effect is that two overcurrent sections are arranged, and the number of heating sections can be increased accordingly, thereby further increasing the coverage area of the heating film on the battery cells in the battery module.

[0010] As a further improvement, the positioning groove is bent and formed.

[0011] The beneficial effect is that the positioning groove is bent and formed from the film body, the overall strength is relatively high, can be matched with the steel bandage, and the connection strength between the heating film and the battery cell is improved.

[0012] As a further improvement, the heating wire is arranged in a serpentine shape from one end of the film body to the other end.

[0013] The beneficial effect is that the serpentine-shaped heating wire is convenient for connecting with the power transmission line in the battery module, and can increase the length of the heating wire that can be accommodated in the film body, thereby improving the heating capacity of the heating film.

[0014] The technical scheme of the battery module provided by the application is as follows: a battery module includes a plurality of battery cells and a steel bandage, the steel bandage binds the battery cells together, the battery module further includes a heating film, the heating film includes a film body and a heating wire, the heating wire is embedded in the film body, the heating film includes an overcurrent section and a heating section, the overcurrent section is used for being mounted on the outer side of the steel bandage, and the heating section is used for being attached to the side of the battery module and used for heating the battery cells; the heating section is provided with at least two, the overcurrent section is located between the two adjacent heating sections, the overcurrent section is provided with a positioning groove used for positioning and cooperating with the steel bandage, and the cross-sectional area of the heating wire in the overcurrent section is greater than the cross-sectional area of the heating wire in the heating section.

[0015] The beneficial effect is that the cross-sectional area of the heating wire in the overcurrent section of the film body of the heating film is greater than the cross-sectional area of the heating wire in the heating section, so that the power of the heating wire in the overcurrent section is small, the heating capacity is small, the overcurrent section is mounted on the side of the steel bandage through the positioning groove, and the overcurrent section is located between the two adjacent heating sections, so that the heating section covers the side of the battery cell across the overcurrent section, and compared with the prior art, the contact area between the heating film and the battery cell is increased, and the heating capacity of the heating film on the battery cell is improved.

[0016] As a further improvement, the overcurrent section is provided with two.

[0017] The beneficial effect is that two overcurrent sections are arranged, and the number of heating sections can be increased accordingly, thereby further increasing the coverage area of the heating film on the battery cells in the battery module.

[0018] As a further improvement, the positioning groove is bent and formed.

[0019] The beneficial effect is that the positioning groove is bent and formed from the film body, the overall strength is relatively high, can be matched with the steel bandage, and the connection strength between the heating film and the battery cell is improved.

[0020] As a further improvement, the heating wire is arranged in a serpentine shape from one end of the film body to the other end.

[0021] The beneficial effect is that the serpentine arrangement of the heating wire is convenient for connecting with the power transmission line in the battery module, and can increase the length of the heating wire that can be accommodated in the film body, and improve the heating capacity of the heating film.

[0022] As a further improvement, a heat shrink tube is sleeved on the steel band.

[0023] The beneficial effect is that the heat shrink tube is sleeved on the steel band to cover the steel band, avoiding the abrasion of the steel band on the heating film.

[0024] As a further improvement, the positioning groove and the steel band are positioned and kept in relative position by the adhesion of the heating section and the battery cell.

[0025] The beneficial effect is that the positioning groove and the steel band are positioned and kept in relative position by the adhesion of the heating section and the battery cell, which is convenient to install. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The partial structure schematic diagram of the battery module is provided for the present application;

[0027] Figure 2 The structure schematic diagram of the heating film is provided for Figure 1

[0028] The side view of the heating film is provided for Figure 3 Figure 2

[0029] Reference signs: 1, battery cell; 2, upper steel band; 3, lower steel band; 4, side plate; 5, heating film; 50, film body; 51, upper heating section; 52, middle heating section; 53, lower heating section; 54, upper overflow section; 55, lower overflow section; 56, expansion hole; 57, wire outlet platform; 6, upper positioning groove; 7, lower positioning groove. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application, that is, the described examples are only a part of the examples of the present application, but not all the examples. The components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0031] ​​The following detailed description of embodiments of the application in the drawings provided is not intended to limit the scope of the application claimed, but merely represents selected embodiments of the application. Based upon the embodiments of the application, all other embodiments that would be obtained by one skilled in the art without having to make inventive efforts are within the scope of the application claimed.

[0032] It should be noted that in the detailed description of the application, the relationship terms such as "first" and "second" and the like that may appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is such an actual relationship or order between the entities or operations. Moreover, the terms that may appear, such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. The limiting elements that may appear, such as "including a" and the like, do not exclude the presence of other identical elements in the process, method, article or device that includes the elements, without more limitations.

[0033] In the description of the application, unless otherwise explicitly specified and limited, the terms that may appear, such as "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0034] In the description of the application, unless otherwise explicitly specified and limited, the term "provided with" that may appear should be understood broadly, for example, the object "provided with" can be part of the body, or it can be arranged separately from the body and connected to the body, and the connection can be detachable or non-detachable. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0035] The application will be further described in detail below in combination with the embodiments.

[0036] Embodiment 1 of the battery module provided in the application:

[0037] As Figure 1As shown, the battery module includes a plurality of battery cells 1 and two steel bands, the two steel bands are divided into upper steel bands 2 and lower steel bands 3, the two steel bands are spaced apart and sleeved on the module composed of each battery cell 1, and each battery cell 1 is bundled together; and a heat shrink sleeve is sleeved on the two steel bands to avoid scratching the battery cell 1 by the steel band; the vertical side of the width direction of the battery module is provided with a side plate 4, and the vertical side of the length direction of the battery module is provided with a heating film 5, and the heating film 5 is used for heating the battery cell 1.

[0038] As shown in Figure 2 and Figure 3 The heating film 5 includes a film body 50, the inside of the film body 50 is provided with a heating wire, the heating wire is arranged in a serpentine shape from one end to the other end of the length direction of the film body 50, so that more heating wires can be accommodated in the film body 50, and the heating capacity of the heating film 5 is improved, and one end of the heating wire is provided with a wire outlet platform 57, the wire outlet platform 57 is located at the end of the film body 50, and is used for connecting with the power line.

[0039] The heating film 5 includes three heating sections and two flow sections, the three heating sections are respectively an upper heating section 51, a middle heating section 52 and a lower heating section 53, the upper heating section 51 is located above the upper steel band 2, and is bonded with the part of the battery cell 1 above the upper steel band 2, the middle heating section 52 is located at the middle position of the two steel bands, and is bonded with the part of the battery cell 1 between the two steel bands, and the lower heating section 53 is located below the lower steel band 3, and is bonded with the part of the battery cell 1 below the lower steel band 3. The middle flow section is also provided with a plurality of expansion holes 56 to avoid the expansion of the battery cell 1 after being heated.

[0040] The two flow sections are respectively an upper flow section 54 and a lower flow section 55, the upper flow section 54 is used for covering the outside of the upper steel band 2, and the lower flow section 55 is used for covering the outside of the lower steel band 3, in particular, the cross-sectional area of the part of the heating wire in the flow section in the film body 50 is greater than the cross-sectional area of the part of the heating wire in the heating section, so that the power of the heating wire in the flow section is small, and the heating capacity is small, avoiding the heat shrink tube sleeved on the steel band from being deformed by heat.

[0041] In order to enable the heating film 5 to closely cooperate with the battery cell 1, the upper positioning groove 6 and the lower positioning groove 7 are formed on the film body 50, the two positioning grooves correspond to the two steel bands one by one, so that the heating film 5 is respectively covered on the outside of the two steel bands during installation, and the heating film 5 is closely attached to the battery cell 1. Compared with the heating film being bonded to the heat shrink tube, in the embodiment, the heating film 5 and the steel band are matched in position, and there is a gap or attachment between them, which can move relatively. Even if the heat shrink tube is deformed, the heat shrink tube will not pull the heating film to deform the heating film, thereby not affecting the connection between the heating film and the battery cell.

[0042] The upper positioning groove 6 coincides with the position of the upper flow section 54 on the heating film 5, and the lower positioning groove 7 coincides with the position of the lower flow section 55 on the heating film 5.

[0043] When the battery module is installed, the plurality of battery cells 1 are first bundled together by the upper steel band 2 and the lower steel band 3, and then the heating film 5 is covered on the side of the battery cell 1, so that the two steel bands sink into the two positioning grooves.

[0044] In the battery module provided in the application, the cross-sectional area of the heating wire in the flow section in the film body 50 of the heating film 5 is greater than that of the heating wire in the heating section, so that the power of the heating wire in the flow section is small, the heating capacity is small, the flow section is installed on the side of the steel band through the positioning groove, and the heating section covers the side of the battery cell 1 across the flow section, compared with the prior art, the contact area of the heating film 5 and the battery cell 1 is increased, and the heating capacity of the heating film 5 on the battery cell 1 is improved.

[0045] Embodiment 2 of the battery module provided in the application:

[0046] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the plurality of battery cells 1 are bundled and fixed by the two steel bands spaced apart from each other, and the two flow sections are arranged on the heating film 5 corresponding to the two steel bands. In the embodiment, the plurality of battery cells are bundled and fixed by the three steel bands arranged in sequence from top to bottom, and three flow sections are arranged on the heating film corresponding to the three steel bands.

[0047] Embodiment 3 of the battery module provided in the application:

[0048] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the positioning groove is formed by bending the mold body. In the embodiment, the heating film material is relatively soft, and when the heating film is pasted on the side of the battery cell, the flow section on the heating film naturally forms a positioning groove under the bonding force to avoid the steel band.

[0049] Embodiment 4 of the battery module provided in the application:

[0050] The difference between the embodiment and the embodiment 1 is that in the embodiment 1, the heating wire is provided with one heating wire, and the separately arranged heating wire is arranged in a snake shape from one end of the film body 50 to the other end of the film body 50. In the embodiment, the heating wire is provided with a plurality of heating wires, and each heating wire is arranged in sequence from one end of the film body to the other end of the film body, and each heating wire is connected in parallel.

[0051] Embodiment 5 of the battery module provided in the application:

[0052] The difference between the embodiment and the embodiment 1 is that the middle heating section 52 of the heating film 5 is provided with the expansion hole 56 in the embodiment 1. In the embodiment, the three heating sections of the heating film are provided with the expansion holes, and the expansion holes provided on the upper heating section and the lower heating section are circular holes.

[0053] The embodiment 6 of the battery module provided in the application is as follows:

[0054] The difference between the embodiment and the embodiment 1 is that the steel band is sleeved with the heat shrink tube in the embodiment 1. In the embodiment, the steel band is not sleeved with the heat shrink tube, and the steel band directly contacts the battery cell and the heating film.

[0055] The embodiment 7 of the battery module provided in the application is as follows:

[0056] The difference between the embodiment and the embodiment 1 is that the heating film is in clearance fit with the heat shrink tube on the steel band in the embodiment 1. In the embodiment, the heating film is bonded with the heat shrink tube on the steel band.

[0057] The embodiment of the heating film of the battery module provided in the application is as follows:

[0058] The structure of the heating film of the battery module in the embodiment is the same as the structure of the heating film 5 of the battery module in the embodiment 1 of the battery module, and will not be described here.

[0059] Of course, in other embodiments, the heating film of the battery module can also select the structure of the heating film 5 in any one of the embodiments 2 to 5 of the battery module, and will not be described here.

[0060] The above is only the preferred embodiment of the application, and does not limit the application. The patent protection scope of the application is subject to the claims, and any equivalent structural changes made according to the content of the specification and the drawings of the application should also be included in the protection scope of the application.

Claims

1. A heating film for a battery module, characterized in that, The heating film (5) includes a membrane (50) and a heating wire. The heating wire is embedded in the membrane (50). The heating membrane (5) includes a flow section and a heating section. The flow section is used to install on the outside of the steel strap of the battery module. The heating section is used to stick on the side of the battery module for heating the battery cell (1). There are at least two heating sections. The flow section is located between two adjacent heating sections. The flow section has a positioning groove for positioning and cooperating with the steel strap. The cross-sectional area of ​​the part of the heating wire in the flow section is larger than the cross-sectional area of ​​the part of the heating wire in the heating section, so that the power of the heating wire in the flow section is small and the heating capacity is small, thus avoiding the heat shrink tube on the steel strap from being deformed by heat.

2. The heating film of the battery module according to claim 1, characterized in that, The flow passage is provided in two sections.

3. The heating film of the battery module according to claim 1, characterized in that, The positioning groove is bent into shape.

4. The heating film of the battery module according to claim 1, 2, or 3, characterized in that, The heating wire is arranged in a serpentine pattern from one end of the membrane (50) to the other end.

5. A battery module comprising a plurality of battery cells (1) and steel straps binding the battery cells (1) together, characterized in that, The battery module also includes a heating film (5), which includes a film body (50) and a heating wire. The heating wire is embedded in the film body (50). The heating film (5) includes a flow section and a heating section. The flow section is used to be installed on the outside of the steel strap and the heating section is used to be pasted on the side of the battery module for heating the battery cell (1). At least two heating sections are provided. The flow section is located between two adjacent heating sections. The flow section has a positioning groove for positioning and cooperating with the steel strap. The cross-sectional area of ​​the part of the heating wire in the flow section is larger than the cross-sectional area of ​​the part of the heating wire in the heating section, so that the power of the heating wire in the flow section is small and the heating capacity is small, thus avoiding the heat shrink tube on the steel strap from being deformed by heat.

6. The battery module according to claim 5, characterized in that, The flow passage is provided in two sections.

7. The battery module according to claim 5, characterized in that, The positioning groove is bent into shape.

8. The battery module according to claim 5, 6, or 7, characterized in that, The heating wire is arranged in a serpentine pattern from one end of the membrane (50) to the other end.

9. The battery module according to claim 5, 6, or 7, characterized in that, The positioning groove and the steel strap are positioned and maintained in relative position by the bonding effect between the heating section and the battery cell (1).

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