Battery pack and electric automobile

Abstract

The utility model relates to a battery pack and an electric vehicle. The battery pack comprises: a box body, wherein the box body comprises a battery accommodating cavity; the battery cell module is arranged in the battery accommodating cavity, the battery cell module comprises at least one row of battery cell groups, and each row of battery cell groups comprises a plurality of battery cells which are arranged side by side; the first heating film is attached to one side, deviating from the bottom surface of the battery accommodating cavity, of the battery cell module; the second heating film is perpendicular to the side-by-side direction of the battery cells of the battery cell group, and the second heating film is attached to the inner side of the box body.

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] With the popularization of new energy vehicles, electric vehicles have gradually become one of the popular choices for public transportation. As one of the core components of an electric vehicle, the power battery directly affects its range. Currently, in related technologies, for low-temperature environments such as winter, heating is usually applied to a large area of ​​the battery, but the heat preservation effect is not significant, and the temperature difference within the battery is noticeable. Utility Model Content

[0003] This application provides a battery pack and an electric vehicle to solve the technical problems existing in the related art.

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

[0005] The housing includes a battery housing cavity;

[0006] A battery cell module is disposed within the battery housing cavity, and the battery cell module includes at least one row of battery cell groups, each row of battery cell groups including multiple battery cells arranged side by side.

[0007] A first heating film is attached to the side of the cell module opposite to the bottom surface of the battery housing cavity;

[0008] The second heating film is arranged perpendicularly to the battery cells of the battery cell assembly and is attached to the inner side of the housing.

[0009] Optionally, the battery pack includes multiple second heating films, and the multiple second heating films are grouped in pairs, with a single battery cell group disposed between each group of second heating films.

[0010] Optionally, the first heating film and the second heating film are connected in series or in parallel to form an electrical circuit, and the electrical circuit is electrically connected to a single power source.

[0011] Optionally, the housing includes a recessed groove from the inside inwards, and the second heating film is attached to the bottom surface of the groove.

[0012] Optionally, the depth of the groove is greater than the thickness of the second heating film.

[0013] Optionally, it also includes an insulating layer, which is disposed in a one-to-one correspondence with the second heating film, with each insulating layer attached to the inner side of the housing and covering the corresponding second heating film.

[0014] Optionally, the battery pack includes multiple cell groups;

[0015] The housing includes at least one longitudinal beam located within the battery housing cavity and arranged in a parallel direction along the battery cells, with each longitudinal beam located between two adjacent battery cell groups.

[0016] Optionally, the first heating film includes a first insulating film, a second insulating film, and a first heating wire disposed between the first insulating film and the second insulating film. The first heating film is provided with a first buffer groove that penetrates at least one of the first insulating film and the second insulating film, and the first buffer groove avoids the first heating wire.

[0017] Optionally, the second heating film includes a third insulating film, a fourth insulating film, and a second heating wire disposed between the third insulating film and the fourth insulating film. The second heating film is provided with a second buffer groove that penetrates at least one of the third insulating film and the fourth insulating film, and the second buffer groove avoids the second heating wire.

[0018] According to a first aspect of the embodiments of this application, an electric vehicle is provided, including a battery pack as described in any of the foregoing embodiments.

[0019] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0020] This application can heat the housing through the second heating film, thereby indirectly heating the battery cell module. This helps maintain the uniform temperature performance of the battery cell module, reduce the battery temperature difference, and improve the battery cell module's range.

[0021] 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

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the structure of a battery pack according to an exemplary embodiment.

[0024] Figure 2 This is a schematic diagram of the structure of a box according to an exemplary embodiment.

[0025] Figure 3 yes Figure 2 A magnified view of a portion of the image.

[0026] Figure 4This is a schematic diagram of another type of housing structure according to an exemplary embodiment.

[0027] Figure 5 yes Figure 4 A magnified view of a portion of the image.

[0028] Figure 6 A schematic diagram showing the positions of a first heating film and a second heating film according to an exemplary embodiment.

[0029] Figure 7 This is a schematic diagram of a partial cross-section of a box according to an exemplary embodiment.

[0030] Figure 8 This is a schematic diagram of another type of housing structure according to an exemplary embodiment.

[0031] Figure 9 yes Figure 8 A partial exploded view of the middle box.

[0032] Figure 10 This is a schematic cross-sectional view of a first heating film according to an exemplary embodiment.

[0033] Figure 11 This is a schematic cross-sectional view of the second heating film according to an exemplary embodiment.

[0034] Explanation of reference numerals in the attached figures

[0035] 1. Housing; 11. Battery housing cavity; 12. Front end plate; 13. Rear end plate; 14. Groove; 15. Longitudinal beam; 2. Cell module; 21. Cell; 3. First heating film; 31. First insulating film; 32. Second insulating film; 33. Heating wire; 34. Buffer groove; 4. Second heating film. Detailed Implementation

[0036] 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.

[0037] The battery management system 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.

[0038] Figure 1 This is a schematic diagram of the structure of a battery pack according to an exemplary embodiment. Figure 2This is a schematic diagram of the structure of a box according to an exemplary embodiment. Figure 3 yes Figure 2 Enlarged view of a part Figure 4 This is a schematic diagram of another type of housing structure according to an exemplary embodiment. Figure 5 yes Figure 4 Enlarged view of a part Figure 6 A schematic diagram illustrating the positions of a first heating film and a second heating film according to an exemplary embodiment is shown. Figures 1-6 As shown, the battery pack includes a housing 1, a cell module 2, a first heating film 3, and a second heating film 4. The housing 1 may include a battery housing cavity 11, within which the cell module 2 can be disposed. For example, the cell module 2 can be securely disposed within the battery housing cavity 11 using a cover plate (not shown) of the housing 1, or it can be clamped within the battery housing cavity 11 using a front end plate 12 and a rear end plate 13 of the housing 1, or it can be fixed by adhesive bonding. The specific design can be customized as needed.

[0039] The battery cell module 2 includes at least one row of battery cell groups, and each row of battery cell groups may include multiple battery cells 21 arranged side by side, such as... Figure 1 As shown, the battery cell module 2 may include two rows of battery cell groups, each row of battery cell groups including multiple parallel battery cells 21, and the parallel directions of the battery cells included in the two rows of battery cell groups can be arranged in parallel, which is beneficial to increasing the capacity of the battery cell module 2. The first heating film 3 is attached to the side of the battery cell module 2 away from the bottom surface of the battery housing cavity 11, that is, the first heating film 3 is attached to the side of the battery cell module 2 facing the cover plate of the housing 1, so as to maximize the contact area between the first heating film 3 and the battery cell module 2 and increase the heating range of the first heating film 3. The second heating film 4 is arranged perpendicular to the parallel direction of the battery cells of the battery cell group, and the second heating film 4 is attached to the inner side of the housing 1, for example Figure 1 As shown, the second heating film 4 can be attached to the front panel 12 or the rear panel 13 of the housing 1, or it can be as shown in the figure. Figure 2 and Figure 4 The front-end board 12 and the rear-end board 13 are respectively attached with a second heating film 4. The first heating film 3 is attached to the battery module 2 using an adhesive or a hot-pressing process. Similarly, the second heating film 4 is attached to the housing 1 using an adhesive or a hot-pressing process.

[0040] Based on this, near the wall of the housing 1, where the battery module 2 is close to the housing 1, the rapid heat dissipation of the housing 1 can easily cause the temperature of the side of the battery module 2 closest to the housing 1 to be lower than the temperature in the middle. The second heating film 4 can heat the housing 1, thereby indirectly heating the battery module 2. This helps to maintain the uniform temperature performance of the battery module 2 and improve its battery life.

[0041] In some embodiments, the battery pack may include a single second heating film 4. In other embodiments, the battery pack may include multiple second heating films 4, with each pair of second heating films 4 forming a group, and a single battery cell group disposed between each group of second heating films 4. For example Figure 2 and Figure 3 As shown, the battery cell module includes two cell groups. Each cell group has a single first heating film 3 attached to the side facing away from the bottom surface of the battery housing cavity 11. The battery pack also includes four second heating films 4. Figure 3 A left-side battery cell assembly is positioned between the two second heating films 4 on the left side, and a right-side battery cell assembly is positioned between the two second heating films 4 on the right side. This allows each battery cell assembly to be heated at both ends by the second heating films 4, thereby improving the temperature uniformity of the battery cell module 2.

[0042] In some embodiments, still using Figure 6 As shown, the first heating film 3 and the second heating film 4 can be connected in series or in parallel to form an electrical circuit, and this electrical circuit is electrically connected to a single power source. This arrangement allows the first heating film 3 and the second heating film 4 to be powered by a single power source, which simplifies the circuit and facilitates control.

[0043] In the above embodiments, such as Figure 7 As shown, the housing 1 may include a recessed groove 14 extending inward from the inside. The second heating film 4 is attached to the bottom surface of the groove 14. This prevents the second heating film 4 from compressing the space of the battery housing 11. Simultaneously, the groove 14, by including the second heating film 4, reduces friction and lowers the risk of short circuits. For example, the front end plate 12 and the rear end plate 13 of the housing 1 are respectively recessed inward to form grooves 14, and the bottom surface of each groove 14 is attached to the second heating film 4. Furthermore, the depth of the groove 14 is greater than the thickness of the second heating film 4 to minimize friction on the second heating film 4 and reduce the risk of damage.

[0044] In some embodiments, such as Figure 8 and Figure 9 As shown, the battery pack also includes an insulating layer 5, which is disposed one-to-one with the second heating film 4. Each insulating layer 5 is attached to the inner side of the housing 1 and covers the corresponding second heating film 4, thereby reducing the short-circuit risk of the second heating film 4 and isolating friction. The area of ​​the insulating layer can be relatively larger than the area of ​​the second heating film 4, and the area of ​​the insulating layer can fully or partially cover the corresponding side of the housing 1. This application does not impose any limitations on this. The insulating layer 5 may include insulating adhesive and be bonded and fixed to the housing 1, or the insulating layer 4 may include an insulating film, which is subsequently bonded and fixed to the housing 1 by adhesive or by hot pressing.

[0045] Still with Figure 8 and Figure 9 As shown, the housing 1 also includes at least one longitudinal beam 15 located in the battery housing cavity 11. The longitudinal beam 15 can be arranged along the parallel direction of the battery cells of the battery cell group, so that the battery housing cavity 11 can be divided into multiple sub-cavities by the longitudinal beam 15. Each sub-cavity can be equipped with a single battery cell group. Each longitudinal beam 15 is located between two adjacent battery cell groups, which can reduce the risk of short circuit between adjacent battery cell groups and improve the safety performance of the battery pack.

[0046] In the above embodiments, since the edge of the cell module is located closer to the housing 1 than the middle area, the edge temperature of the cell module may be relatively lower than the temperature of the middle area. Therefore, the battery pack may also include a heater located on the side of the first heating film 3 away from the cell module 2 and facing the edge area of ​​the first heating film 3. This allows the heater to heat the low-temperature area of ​​the first heating film 3, thereby improving the temperature uniformity of the first heating film 3.

[0047] like Figure 10 As shown, the first heating film 3 includes a first insulating film 31, a second insulating film 32, and a first heating wire 33 located between the first insulating film 31 and the second insulating film 32. The first heating film 3 also includes a first buffer groove 34 penetrating the first insulating film 31 and the second insulating film 32. The first buffer groove 34 can buffer the stress generated when the first heating film 3 expands, reducing the deformation of the first heating film 3. At the same time, the first buffer groove 34 avoids the first heating wire 33 from being directly exposed, preventing the first heating wire 33 from causing a risk. The first buffer groove 34 may also penetrate the first insulating film 31 or the second insulating film 32.

[0048] Similarly, such as Figure 11 As shown, the second heating film 4 includes a third insulating film 41, a fourth insulating film 42, and a second heating wire 44 located between the third insulating film 41 and the fourth insulating film 42. The second heating film 4 also includes a second buffer groove 44 penetrating the third insulating film 41 and the fourth insulating film 42. The second buffer groove 44 can buffer the stress generated when the second heating film 4 expands, reducing the deformation of the second heating film 4. Simultaneously, the second buffer groove 44 avoids the second heating wire 44 from being directly exposed, preventing potential risks. The second buffer groove 44 may also penetrate either the third insulating film 41 or the fourth insulating film 42.

[0049] It is understood that the above description is only some illustrative embodiments of the battery management system 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.

[0050] This application also provides an electric vehicle. The electric vehicle includes the battery pack described above.

[0051] 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.

[0052] The battery management system 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 management system 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: The housing includes a battery housing cavity; A battery cell module is disposed within the battery housing cavity, and the battery cell module includes at least one row of battery cell groups, each row of battery cell groups including multiple battery cells arranged side by side. A first heating film is attached to the side of the cell module opposite to the bottom surface of the battery housing cavity; The second heating film is arranged perpendicularly to the battery cells of the battery cell assembly and is attached to the inner side of the housing.

2. The battery pack according to claim 1, characterized in that, The battery pack includes multiple second heating films, and the multiple second heating films are grouped in pairs, with a single battery cell group arranged between each group of second heating films.

3. The battery pack according to claim 1, characterized in that, The first heating film and the second heating film are connected in series or in parallel to form an electrical circuit, and the electrical circuit is electrically connected to a single power source.

4. The battery pack according to claim 1, characterized in that, The housing includes a recessed groove extending inward from the inside, and the second heating film is attached to the bottom surface of the groove.

5. The battery pack according to claim 4, characterized in that, The depth of the groove is greater than the thickness of the second heating film.

6. The battery pack according to claim 1, characterized in that, It also includes an insulating layer, which is provided in a one-to-one correspondence with the second heating film. Each insulating layer is attached to the inner side of the housing and covers the corresponding second heating film.

7. The battery pack according to claim 1, characterized in that, The battery pack includes multiple cell groups; The housing includes at least one longitudinal beam located within the battery housing cavity and arranged in a parallel direction along the battery cells, with each longitudinal beam located between two adjacent battery cell groups.

8. The battery pack according to claim 1, characterized in that, The first heating film includes a first insulating film, a second insulating film, and a first heating wire disposed between the first insulating film and the second insulating film. The first heating film is provided with a first buffer groove that penetrates at least one of the first insulating film and the second insulating film, and the first buffer groove avoids the first heating wire.

9. The battery pack according to claim 1, characterized in that, The second heating film includes a third insulating film, a fourth insulating film, and a second heating wire disposed between the third insulating film and the fourth insulating film. The second heating film is provided with a second buffer groove that penetrates at least one of the third insulating film and the fourth insulating film, and the second buffer groove avoids the second heating wire.

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

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