Battery pack and electric vehicle

Abstract

This application relates to a battery pack and an electric vehicle. The battery pack includes: a cell module, which includes at least one row of cell groups, each row of cell groups including multiple cells arranged side by side; a heating film, which is attached to the surface of the cell module and includes a first insulating film, a second insulating film, and a heating wire disposed between the first and second insulating films. The heating wire includes at least one row of circuit groups, each row of circuit groups including multiple wires arranged side by side and multiple electrical connection segments. Adjacent wires in the side-by-side direction are electrically connected through the electrical connection segments. The side-by-side direction of the multiple wires in each circuit group is parallel to the side-by-side direction of the cells in the cell group, and the length direction of the wires is parallel to the length direction of the cells. Each cell in each cell group corresponds to at least one wire in the same circuit group, and the gap between adjacent cells corresponds to an electrical connection segment.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and more particularly to a battery pack and an electric vehicle. Background Technology

[0002] A common heating method in electric vehicle battery heating systems is the use of heating films. However, in these technologies, the heating wires of the heating film are attached to the gaps between the battery cells, which increases the thermal resistance of the heating film and, in severe cases, poses a risk of dry burning. Utility Model Content

[0003] This application provides a battery pack and an electric vehicle to address the shortcomings of related technologies.

[0004] According to a first aspect of the embodiments of this application, a battery pack is provided, comprising:

[0005] A battery cell module, the battery cell module comprising at least one row of battery cell groups, each row of battery cell groups comprising a plurality of battery cells arranged side by side;

[0006] A heating film is attached to the surface of the battery cell module. The heating film includes a first insulating film, a second insulating film, and a heating wire. The heating wire is disposed between the first insulating film and the second insulating film. The heating wire includes at least one row of circuit groups. Each row of circuit groups includes multiple wiring lines arranged side by side and multiple electrical connection segments. Adjacent wiring lines in the side-by-side direction are electrically connected through the electrical connection segments.

[0007] In each of the circuit groups, the parallel direction of the multiple wiring lines is parallel to the parallel direction of the cells in the cell group, the length direction of the wiring lines is parallel to the length direction of the cells, each cell in each cell group corresponds to at least one wiring line in the same circuit group, and the gap between adjacent cells corresponds to the electrical connection segment.

[0008] Optionally, each of the aforementioned wiring lines is arranged in a curved shape, and the corners are curved transitions.

[0009] Optionally, the heating wire includes multiple rows of circuit groups, and each cell of any of the cell groups corresponds to at least one of the wiring lines in each of the multiple circuit groups; or, the heating wire includes multiple rows of circuit groups, and each cell of any of the cell groups corresponds to at least one of the wiring lines in a single circuit group.

[0010] Optionally, the gap between adjacent rows of the battery cell groups corresponds to the gap between adjacent rows of the circuit groups.

[0011] Optionally, the heating film further includes a first buffer groove penetrating at least one of the first insulating film and the second insulating film, the first buffer groove being located in the gap between adjacent rows of the line groups and corresponding to the gap between adjacent rows of the cell groups.

[0012] Optionally, the heating film further includes a second buffer groove penetrating at least one of the first insulating film and the second insulating film, the second buffer groove being located in the gap between adjacent wiring lines and corresponding to the gap between adjacent cells in the same row of cell groups.

[0013] Optionally, the heating film further includes a filling portion located between the first insulating film and the second insulating film, and at least one of the filling portions is provided in the gap between adjacent rows of the line groups and / or in the gap between adjacent lines.

[0014] Optionally, in the same circuit group, the gaps between adjacent wiring lines are equal or unequal. When the gaps between adjacent wiring lines are unequal, in the parallel direction of the wiring lines, the spacing between the wiring lines corresponding to the battery cell is less than the length of the electrical connection segment.

[0015] Optionally, the width of the wiring path is smaller than the width of the electrical connection section; or,

[0016] The heating film also includes at least one positioning hole;

[0017] The battery pack further includes a housing, and the battery cell module is disposed within the housing. The housing includes positioning posts that mate with the positioning holes; or

[0018] The heating film has a conventional power zone and a power enhancement zone, with the power enhancement zone located at the edge of the heating film in the parallel direction of the battery cells.

[0019] According to a second aspect of the present disclosure, an electric vehicle is provided, including a battery pack as described in any of the foregoing embodiments.

[0020] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0021] This application allows most of the heating area of ​​the heating wire, except for some electrical connection sections, to fall on the battery cell, which can reduce the heating of the gap between the battery cells by the heating wire, reduce the heat concentration at the gap between the battery cells, and reduce the risk of local dry burning of the heating film.

[0022] As can be seen from the above embodiments, it should be understood that the above general description and the following detailed description are merely exemplary and explanatory, and do not limit the present application. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0024] Figure 1 This is an exploded view of a battery pack according to an exemplary embodiment.

[0025] Figure 2 This is a schematic cross-sectional view of a heating film according to an exemplary embodiment.

[0026] Figure 3 This is a schematic diagram of the structure of a heating wire according to an exemplary embodiment.

[0027] Figure 4 This is a schematic diagram showing the position between a battery cell module and a heating wire according to an exemplary embodiment.

[0028] Figure 5 This is a perspective view of a battery pack according to an exemplary embodiment.

[0029] Figure 6 This is a schematic diagram illustrating the position between another battery cell module and a heating wire according to an exemplary embodiment.

[0030] Figure 7 This is a partial schematic diagram of a heating wire according to an exemplary embodiment.

[0031] Figure 8 This is a partial schematic diagram illustrating another heating wire according to an exemplary embodiment.

[0032] Figure 9 This is a perspective view of a heating film according to an exemplary embodiment.

[0033] Figure 10 This is a partial schematic diagram illustrating another heating wire according to an exemplary embodiment.

[0034] Figure 11 This is a power partition diagram of a heating film according to an exemplary embodiment.

[0035] Figure 12 This is a schematic diagram of the structure of a heating film according to an exemplary embodiment.

[0036] Explanation of reference numerals in the attached figures

[0037] 1. Battery cell module; 11. Battery cell assembly; 12. Battery cell; 2. Heating film; 21. First insulating film; 22. Second insulating film; 23. Heating wire; 24. Circuit assembly; 25. Wiring circuit; 26. Electrical connection section; 27. First buffer groove; 28. Second buffer groove; 29. ​​Filling section; 201. Conventional power area; 202. Power enhancement area; 203. Positioning hole; 3. Housing; 31. Main body; 32. Battery housing cavity. Detailed Implementation

[0038] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses consistent with some aspects of this application as detailed in the appended claims.

[0039] The battery pack and electric vehicle of this application will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features of the following embodiments and implementations can be combined with each other.

[0040] Figure 1 This is an exploded view of a battery pack according to an exemplary embodiment. Figure 2 This is a cross-sectional schematic diagram of a heating film according to an exemplary embodiment. Figure 3 This is a schematic diagram of a heating wire structure according to an exemplary embodiment. Figure 4 This is a schematic diagram illustrating the position between a battery cell module and a heating wire according to an exemplary embodiment. Figures 1-4 As shown, the battery pack includes a cell module 1, a heating film 2, and a housing 3. The housing 3 may include a main body 31, a cover plate, and a battery receiving cavity 32. The main body 31 and the cover plate can form the battery receiving cavity 32. The cell module 1 is disposed in the battery receiving cavity 32. The cover plate and the main body 31 are detachably connected to facilitate the disassembly and installation of the cell module 1.

[0041] The battery cell module 1 may include at least one row of battery cell groups 11, and each row of battery cell groups 11 may include multiple battery cells 12 arranged side by side. The multiple rows of battery cell groups 11 may be arranged side by side within the battery housing cavity 33. For example, such as... Figure 4As shown, the battery module 1 includes two rows of battery cell groups 11, each row of battery cell groups 11 including multiple battery cells 12 arranged side by side along the X direction, and the two rows of battery cell groups 11 arranged side by side along the Y direction. A heating film 2 is attached to the surface of the battery module 1. Specifically, the heating film 2 can be attached to any one or more of the upper, lower, left, right, front, and rear surfaces of the battery module 1. The heating film 2 includes a first insulating film 21, a second insulating film 22, and a heating wire 23. The heating wire 23 is disposed between the first insulating film 21 and the second insulating film 22. Subsequently, the battery module 1 can be heated by energizing the heating wire 23, which helps to maintain the temperature of the battery module 1 and improve the battery life of the battery module 1 in low-temperature environments.

[0042] The heating wire 23 includes at least one row of circuit groups 24. Each row of circuit groups 24 includes multiple parallel wiring lines 25 and electrical connection sections 26. Adjacent wiring lines 25 in the parallel direction are electrically connected through the electrical connection sections 26, so that the wiring lines 25 included in each row of circuit groups 24 are connected in series to form a heating section. In some embodiments, the wiring lines of each row of circuit groups 24 may be connected in series, and multiple rows of circuit groups 24 may be connected in parallel. In other embodiments, the wiring lines of each row of circuit groups 24 may be connected in series, and multiple rows of circuit groups 24 may be connected in series to form a heating section. The series connection of circuit groups 24 between adjacent rows may be achieved through the same outermost wiring line 25, or by electrically connecting two wiring lines 25 located at the outermost edge of two adjacent rows on the same side.

[0043] The lengths of the multiple wiring lines 25 included in the same row of wiring groups 24 may be equal or unequal. In some embodiments, the gaps between adjacent wiring lines 25 in the same row of wiring groups 24 may be equal. In other embodiments, the gaps between adjacent wiring lines 25 in the same row of wiring groups 24 may be unequal. Furthermore, in the parallel direction of the wiring lines 25, the spacing between the wiring lines 25 corresponding to the battery cell 12 is less than the length of the electrical connection segment 26. In other words, the spacing between two wiring lines 25 connected to the electrical connection segment is less than the spacing between two wiring lines 25 both corresponding to the battery cell 12. This helps to increase the heating area of ​​the battery cell 12 while reducing the heating of the gaps between the battery cells 12.

[0044] In this embodiment, the parallel direction of the multiple wiring lines 25 in each line group 24 is parallel to the parallel direction of the battery cells 12 in the cell group 11, that is... Figure 4As shown, multiple traces 25 of each row of circuit groups 24 are arranged side by side along the X direction, and each cell of each cell group 11 corresponds to at least one trace 25 in the same circuit group 24. The gap between adjacent cells 12 corresponds to the electrical connection section 26. In other words, in the direction perpendicular to both the X and Y directions, the projection of each trace 25 is located within the projection range of the cell 12, and at least part of the projection of the electrical connection section 26 is located within the projection of the gap between adjacent cells 12. Moreover, on the surface to which the heating film 2 is attached, the length direction of the cell 12 is parallel to the length direction of the trace 25. This arrangement ensures that most of the heating area of ​​the heating wire 23, except for a portion of the electrical connection section 26, falls on the cell 12, reducing the heating of the gap between the cells 12 by the heating wire 23, reducing heat concentration at the cell gap, and lowering the risk of localized dry burning of the heating film 2.

[0045] It should be noted that, in Figures 4-5 In the embodiment shown, each battery cell 12 is configured to correspond to a single wiring line 25 of the same circuit group 24. In fact, in other embodiments, each battery cell 12 may also correspond to multiple wiring lines 25 of the same circuit group 24. The number of wiring lines 25 corresponding to the same circuit group 24 of multiple battery cells 12 may be the same or different.

[0046] In some other embodiments, such as Figure 4 and Figure 5 As shown, the heating wire 23 may include multiple rows of circuit groups 24, which can be arranged one-to-one with multiple rows of battery cell groups 11. That is, each battery cell 12 of each battery cell group 11 corresponds to at least one wiring line in a single circuit group 24. Of course, in Figure 3 The example shown is based on the premise that each cell 12 of each cell group 11 corresponds to at least one wiring line 25. In reality, it can also be that one or more cells 12 of one or more cell groups 11 correspond to at least one wiring line 25.

[0047] Or, such as Figure 6 As shown, in some embodiments, the heating wire may include multiple rows of circuit groups 24, and each cell of each cell group 11 may correspond to at least one wiring line 25 of each circuit group 24, thereby further increasing the heating area corresponding to each cell 12 and increasing the heating rate. Of course, in Figure 5 The example described uses a single cell group 14, with each cell 12 corresponding to two wiring lines 25 of different circuit groups 24. In other embodiments, each cell 12 may correspond to three or more wiring lines of different circuit groups 24.

[0048] In fact, in some other embodiments, each cell 12 of at least one row of cell groups 14 may correspond to at least one routing line 25 of the same line group 24, and each cell 12 of at least one row of cell groups 14 may correspond to at least one routing line 25 of each of multiple line groups 24. The specific design can be customized as needed.

[0049] In the above embodiments, such as Figure 7 As shown, each wiring line 25 is arranged in a curved shape, and the corners are curved. For example, the wiring line 25 can be a serpentine wiring line, an S-shaped wiring line, or a curved wiring line in the shape of a square groove. This can further increase the heating area of ​​the battery cell 12, and at the same time help resist the expansion of the battery cell module 1 after long-term operation, reduce the risk of short circuit, and improve the safety performance of the battery pack.

[0050] Still with Figure 4 and Figure 5 As shown, the gap between adjacent battery cell groups 11 corresponds to the gap between adjacent battery line groups 24. This reduces heating of the gaps between battery cell groups 11, reduces heat focusing at the cell gaps, and lowers the risk of localized dry burning of the heating film 2. Of course, in Figure 3 When there is a one-to-one correspondence between the cell group 11 and the line group 24, the gap between adjacent rows of cell groups 11 can correspond to the gap between adjacent rows of line groups 24. When there is a one-to-many relationship between the cell group 11 and the line group 24, the gap between adjacent rows of cell groups 11 can also correspond to the gap between adjacent rows of line groups 24.

[0051] In the above embodiments, such as Figure 8 As shown, the heating film 2 also includes a first buffer groove 27 penetrating at least one of the first insulating film 21 and the second insulating film 22. The first buffer groove 27 is located within the gap between adjacent rows of circuit groups 24 and corresponds to the gap between adjacent rows of battery cell groups 11. Based on this, on the one hand, heating of the gap between battery cell groups 11 can be further reduced, and on the other hand, the first buffer groove 27 can buffer deformation stress, resist the expansion deformation of the battery cell module 1, and reduce the risk of breakage of the heating film 2. Since the first buffer groove 27 corresponds to the gap between adjacent rows of battery cell groups 11, in order to increase the area of ​​the first buffer groove 27 and improve its ability to buffer stress, the length direction of the first buffer groove 27 can be parallel to the parallel direction of the battery cell groups 11, that is, parallel to the parallel direction of the multiple wiring lines 25 included in the circuit group 24.

[0052] Similarly, still based on Figure 8As shown, the heating film 2 also includes a second buffer groove 28 penetrating at least one of the first insulating film 21 and the second insulating film 22. The second buffer groove 28 is located in the gap between adjacent wiring lines 25 and corresponds to the gap between adjacent cells 12 in the same row of cell groups 11. Based on this, on the one hand, heating of the gap between cells 12 can be further reduced, and on the other hand, the second buffer groove 28 can buffer deformation stress, resist the expansion deformation of the cell module 1, and reduce the risk of breakage of the heating film 2.

[0053] In the above embodiments, such as Figure 9 As shown, the heating film 2 also includes a filling portion 29 located between the first insulating film 21 and the second insulating film 22. At least one filling portion 29 is provided in the gap between adjacent circuit groups 24. This helps to ensure the flatness of the heating film 2, reduce wrinkles, and ensure the flatness of the fit between the heating film 2 and the battery cell module 1. The filling portion 29 can be a non-energized resistance wire or a flat part of other materials. This disclosure does not limit this. The filling portion 29 can also be provided in the gap between adjacent wiring lines 25, or in the same heating film 2, one or more filling portions 29 can be provided in the gap between adjacent wiring lines 25 and in the gap between adjacent battery cell groups 11, respectively. The specific design can be customized as needed.

[0054] In the above embodiments, such as Figure 10 As shown, the width of the wiring line 25 is smaller than the width of the electrical connection section 26. Furthermore, since the extension direction of the wiring line 25 is perpendicular to the extension direction of the electrical connection section 26, the direction relative to the width of the wiring line 25 is perpendicular to the direction relative to the width of the electrical connection section 26. Figure 10 As shown, the width of the wiring line 25 is L1 in the horizontal direction, and the width of the electrical connection section 26 is L2 in the vertical direction. L1 is smaller than L2, for example, L2 can be twice or more than L1. Based on this setting, by designing the wiring line 25 to be narrower, the internal resistance can be increased, the heat generation can be increased, and similarly, the heating amount of the electrical connection section 26 can be reduced, thus reducing the heating at the gap.

[0055] In some embodiments, such as Figure 11 As shown, the heating film 2 can be provided with a conventional power area 201 and a power enhancement area 202, and the power enhancement area 202 is located at the edge of the heating film 2 in the parallel direction of the battery cells. It can be understood that the end area of ​​the battery cell module 1 in the parallel direction of the battery cells is usually located close to the end plate of the housing 3. Since the housing 3 dissipates heat quickly, the end temperature of the battery cell module 1 will decrease. Therefore, by setting the power enhancement area of ​​the heating film 2, the low temperature point can be heated to improve the temperature uniformity of the battery cell module 1.

[0056] In some embodiments, such as Figure 12 As shown, the heating film 2 may also include a positioning hole 203, and the housing 3 may also include a positioning post (not shown) that cooperates with the positioning hole 203. The cooperation between the positioning hole 203 and the positioning post allows for positioning of the heating film 2, effectively controlling its bonding position. The number of positioning holes 203 can be one or more, and each positioning hole 203 can be a round hole or an oblong hole. Especially when the positioning hole 203 is an oblong hole, it can prevent the heating film 2 from rotating, further improving the bonding accuracy between the heating film 2 and the battery module 1. The positioning hole 203 can penetrate the first insulating film 21 and the second insulating film 22, while avoiding the heating wire 23.

[0057] It is understood that the above description is only some illustrative embodiments of the battery pack of this application. Without departing from the inventive essence of this application, some structures of the battery pack of this application can be made equivalent or similarly, and all of them will be covered within the scope of protection defined by the appended claims.

[0058] This application also provides an electric vehicle. The electric vehicle includes the battery pack described above.

[0059] The electric vehicle described in this application can have similar beneficial technical effects to the battery pack described above, therefore, it will not be repeated here.

[0060] The battery pack and electric vehicle provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the battery pack and electric vehicle of this application. The descriptions of the embodiments above are only for helping to understand the core ideas of this application and are not intended to limit this application. It should be noted that those skilled in the art can make several improvements and modifications to this application without departing from the spirit and principles of this application, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A battery pack, characterized in that, include: A battery cell module, the battery cell module comprising at least one row of battery cell groups, each row of battery cell groups comprising a plurality of battery cells arranged side by side; A heating film is attached to the surface of the battery cell module. The heating film includes a first insulating film, a second insulating film, and a heating wire. The heating wire is disposed between the first insulating film and the second insulating film. The heating wire includes at least one row of circuit groups. Each row of circuit groups includes multiple wiring lines arranged side by side and multiple electrical connection segments. Adjacent wiring lines in the side-by-side direction are electrically connected through the electrical connection segments. In each of the circuit groups, the parallel direction of the multiple wiring lines is parallel to the parallel direction of the cells in the cell group, the length direction of the wiring lines is parallel to the length direction of the cells, each cell in each cell group corresponds to at least one wiring line in the same circuit group, and the gap between adjacent cells corresponds to the electrical connection segment.

2. The battery pack according to claim 1, characterized in that, Each of the aforementioned wiring lines is arranged in a curved shape, and the corners are curved transitions.

3. The battery pack according to claim 1, characterized in that, The heating wire includes multiple rows of circuit groups, and each cell of any of the cell groups corresponds to at least one of the wiring lines in each of the multiple circuit groups; or, the heating wire includes multiple rows of circuit groups, and each cell of any of the cell groups corresponds to at least one of the wiring lines in a single circuit group.

4. The battery pack according to claim 1, characterized in that, The gap between adjacent rows of the battery cell groups corresponds to the gap between adjacent rows of the circuit groups.

5. The battery pack according to claim 4, characterized in that, The heating film further includes a first buffer groove penetrating at least one of the first insulating film and the second insulating film, the first buffer groove being located in the gap between adjacent rows of the line groups and corresponding to the gap between adjacent rows of the cell groups.

6. The battery pack according to claim 1, characterized in that, The heating film further includes a second buffer groove penetrating at least one of the first insulating film and the second insulating film. The second buffer groove is located in the gap between adjacent wiring lines and corresponds to the gap between adjacent cells in the same row of cell groups.

7. The battery pack according to claim 1, characterized in that, The heating film further includes a filling portion located between the first insulating film and the second insulating film, and at least one of the filling portions is provided in the gap between adjacent rows of the line groups and / or in the gap between adjacent wiring lines.

8. The battery pack according to claim 1, characterized in that, In the same circuit group, the gaps between adjacent wiring lines are equal or unequal. When the gaps between adjacent wiring lines are unequal, in the parallel direction of the wiring lines, the spacing between the wiring lines corresponding to the battery cell is less than the length of the electrical connection segment.

9. The battery pack according to claim 1, characterized in that, The width of the wiring path is smaller than the width of the electrical connection section; or, The heating film also includes at least one positioning hole; The battery pack further includes a housing, and the battery cell module is disposed within the housing. The housing includes positioning posts that mate with the positioning holes; or The heating film has a conventional power zone and a power enhancement zone, with the power enhancement zone located at the edge of the heating film in the parallel direction of the battery cells.

10. An electric vehicle, characterized in that, Includes the battery pack as described in any one of claims 1-9.

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