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; each heating film is attached to the inner surface of the battery accommodating cavity or the outer surface of the battery cell module, and a plurality of outer surfaces of the battery cell module are covered by the heating films; each temperature sensor is used for detecting the temperature of any surface attached to the heating film; and the regulation and control module is used for controlling connection and disconnection between the corresponding heating film and the power supply end according to the temperature data detected by the temperature sensor.

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] In electric vehicle battery heating systems, a common heating method is the use of heating films. As the requirements for battery system heating speed increase, the power of heating films is also increasing. Current heating films can reach a surface temperature of around 200°C after prolonged power-on. Sustained high temperatures can damage the heating film and pose a risk of battery thermal runaway. 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] The housing includes a battery housing cavity;

[0006] A battery cell module, wherein the battery cell module is disposed within the battery housing cavity;

[0007] Multiple heating films are attached to the inner surface of the battery housing cavity or the outer surface of the cell module, and the multiple outer surfaces of the cell module are covered by the heating films.

[0008] Multiple temperature sensors, each of which is used to detect the temperature of any surface to which the heating film is attached;

[0009] The control module controls the connection and disconnection between the heating film and the power supply terminal based on the temperature data detected by the temperature sensor.

[0010] Optionally, one or more temperature sensors may be provided on the surface that is in contact with the heating film.

[0011] Optionally, the surface that is in contact with the heating film is divided into a first surface and a second surface, each of the first surfaces is provided with at least one temperature sensor, and the second surface is not provided with a temperature sensor;

[0012] The heating film attached to the second surface is connected in series with any heating film attached to the first surface.

[0013] Optionally, the system may also include multiple switches, each of which is electrically connected to the control module and at least one heating film. The control module controls the switching on and off based on the temperature data detected by the temperature sensor, thereby controlling the connection between the heating film connected to the switch and the power supply terminal.

[0014] Optionally, at least one heating film is attached to the outer surface of the battery cell module.

[0015] Optionally, at least one heating film is attached to a surface of the cell module parallel to the bottom surface of the battery housing cavity;

[0016] At least one heating film is attached to the surface of the cell module parallel to the side of the battery housing cavity.

[0017] Optionally, at least one heating film is attached to the inner surface of the battery housing cavity.

[0018] Optionally, at least one heating film is attached to the surface of the battery housing that is perpendicular to the depth direction;

[0019] At least one heating film is attached to the surface of the battery housing cavity that is parallel to the depth direction.

[0020] Optionally, it also includes an insulating layer, with at least one insulating layer disposed between two parallel and adjacent heating films.

[0021] According to a second aspect of the embodiments of this application, an electric vehicle is provided, including a battery pack as described in any of the foregoing embodiments.

[0022] The technical solutions provided by the embodiments of this application may include the following beneficial effects:

[0023] By working together with the control module, temperature sensor, and heating film, the temperature of the battery cell module can be maintained within a suitable temperature range. Furthermore, the detection by multiple temperature sensors allows for individual temperature control of each zone corresponding to the heating film, enabling precise temperature adjustment of each part of the battery cell module. This improves the uniform temperature performance of the battery cell module, extends battery pack life, and reduces heat loss and the risk of thermal runaway.

[0024] 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

[0025] 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.

[0026] Figure 1 This is a schematic diagram of the structure of a battery pack according to an exemplary embodiment.

[0027] Figure 2 This is an exploded view of a battery pack according to an exemplary embodiment.

[0028] Figure 3 This is an exploded view of a housing and a battery cell module according to an exemplary embodiment.

[0029] Figure 4 This is an exploded schematic diagram illustrating the relationship between a battery cell module and a heating film according to an exemplary embodiment.

[0030] Figure 5 This is an exploded view of a housing, a battery module, and a heating film according to an exemplary embodiment.

[0031] Figure 6 This is a circuit connection diagram of a battery pack according to an exemplary embodiment.

[0032] Explanation of reference numerals in the attached figures

[0033] 1. Housing; 11. Main body; 12. Cover; 13. Battery housing cavity; 2. Battery cell module; 3. Heating film; 4. Temperature sensor; 5. Control module; 6. Switch. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] Figure 1 This is a schematic diagram of the structure of a battery pack according to an exemplary embodiment. Figure 2 This is an exploded view of a battery pack according to an exemplary embodiment. Figures 1-2 As shown, the battery pack includes a housing 1, a cell module 2, a heating film 3, a temperature sensor 4, and a control module 5. The housing 1 may include a main body 11, a cover plate 12, and a battery receiving cavity 13. The main body 11 and the cover plate 12 form the battery receiving cavity 13. The cell module 2 is disposed within the battery receiving cavity 13. The cover plate 12 is detachably connected to the main body 11, facilitating the disassembly and installation of the cell module 2. The cell module 2 may include multiple cells, which can be arranged in multiple rows and columns within the battery receiving cavity 13.

[0037] There are multiple heating films 3, and each heating film 3 can be attached to the inner surface of the battery housing cavity 13 or the outer surface of the cell module 2, and each heating film 3 is located on the outer side of the cell module 2. Based on the arrangement of multiple heating films 3, multiple outer surfaces of the cell module 2 can be covered by the heating films 3, thereby providing multi-faceted heating for the cell module 2, which is beneficial to improving the temperature uniformity performance of the cell module 2. The cell module 2 being covered by the heating films 3 can be understood as the heating film 3 attached to the cell module 2 covering the outer surface, or it can be the heating film 3 attached to the housing 1 covering the corresponding outer surface of the cell module 2.

[0038] Each temperature sensor 4 can be used to detect the temperature of any surface attached to the heating film 3. That is, each temperature sensor 4 can detect the temperature of the surface where the battery module 2 is attached to the heating film 3, or each temperature sensor 4 can detect the temperature of the surface where the housing 1 is attached to the heating film 3. Each temperature sensor 4 is electrically connected to the control module 5. The control module 5 can control the on / off connection between the corresponding heating film 3 and the power supply terminal based on the temperature data detected by the temperature sensor 4, thereby allowing the heating film 3 to switch to the energized state to perform heating operation, or to the de-energized state to stop heating operation. The power supply terminal can be the battery module 2 itself or an external power source; this application does not impose any restrictions on this.

[0039] For example, taking the battery cell module 2 as a lithium-ion battery, its optimal operating temperature is typically between 20℃ and 30℃. Therefore, when the control module 5 detects a temperature higher than 30℃ from the temperature sensor 4, it can disconnect the heating film 3 (the object detected by the temperature sensor 4) from the power supply, stopping the heating film 3 from heating the battery cell module 2, thus maintaining the temperature of the battery cell module 2 within the optimal operating temperature range. When the control module 5 detects a temperature lower than 20℃ from the temperature sensor 4, it can energize the heating film 3 (the object detected by the temperature sensor 4) from the power supply, allowing the heating film 3 to heat the battery cell module 2, thus maintaining the temperature of the battery cell module 2 within the optimal operating temperature range. Of course, when the temperature detected by the temperature sensor 4 is within the 20℃-30℃ range, maintaining the energization between the heating film 3 and the power supply is sufficient.

[0040] Based on this, the combined action of the control module 5, temperature sensor 4, and heating film 3 helps maintain the temperature of the battery cell module 2 within a suitable temperature range. Furthermore, the detection by multiple temperature sensors 4 allows for separate temperature control of each zone corresponding to the heating film 3, enabling precise temperature adjustment of each position of the battery cell module 2, improving the uniform temperature performance of the battery cell module 2, extending battery pack life, and reducing heat loss and the risk of thermal runaway.

[0041] In some embodiments, at least one heating film is attached to the inner surface of the battery housing 13. For example, such as Figure 2 As shown, additional heating films 3 are attached to the front, rear, left, right, top, and bottom surfaces of the battery housing cavity 13, thereby maximizing the heating of the cell module 2 from all angles. Moreover, since each heating film 3 is responsible for a different area, it is beneficial to control the on / off state of the heating film 3 through the control module 5 to achieve precise temperature regulation.

[0042] exist Figure 2 In this embodiment, the additional heating film 3 is applied to the front, rear, left, right, upper, and lower surfaces of the battery housing 14, respectively, as an example. In other embodiments, the additional heating film 3 may be applied to the upper and lower surfaces of the battery housing 14, or in some other embodiments, the additional heating film 3 may be applied to the front, rear, left, and right surfaces of the battery housing 14. Alternatively, at least one heating film 3 may be attached to the surface of the battery housing 13 parallel to the depth direction, i.e., attached to the side of the battery housing 13, and at least one heating film 3 may be attached to the surface of the battery housing 13 perpendicular to the depth direction, i.e., attached to the top or bottom surface of the battery housing 13. In practice, the position and number of heating films 3 attached to the inner surface of the battery housing 13 can be adaptively designed according to actual needs.

[0043] In some embodiments, such as Figure 3 and Figure 4 As shown, at least one of the plurality of heating films 3 is attached to the outer surface of the battery cell module 2. For example, as... Figure 4 As shown, additional heating films 3 are attached to the front, back, left, right, top, and bottom surfaces of the battery cell module 2, thereby maximizing heating of the battery cell module 2 from all angles. Moreover, since each heating film 3 is responsible for a different area, it is beneficial to control the on / off state of the heating film 3 through the control module 5 to achieve precise temperature regulation.

[0044] exist Figure 3 and Figure 4In this embodiment, the example is that additional heating films 3 are attached to the front, rear, left, right, top, and bottom surfaces of the cell module 2. In other embodiments, additional heating films 3 may be attached to the top and bottom surfaces of the cell module 2, or in some other embodiments, additional heating films 3 may be attached to the front, rear, left, and right surfaces of the cell module 2. Alternatively, at least one heating film 3 may be attached to a surface of the cell module 2 parallel to the depth direction of the battery cavity 13, i.e., attached to the side of the cell module 2, and at least one heating film 3 may be attached to a surface of the cell module 2 perpendicular to the depth direction of the battery cavity 13, i.e., attached to the top or bottom surface of the cell module 2. In practice, the position and number of heating films 3 attached to the surface of the cell module 2 can be adaptively designed according to actual needs.

[0045] Furthermore, such as Figure 5 As shown, the heating film 3 can also be simultaneously attached to both the surface of the cell module 2 and the inner surface of the battery housing cavity 13. For example, Figure 5 As shown, additional heat-conducting films 3 are attached to the front, rear, left, right, top, and bottom surfaces of the cell module 2, and additional heat-conducting films 3 are attached to the front, rear, left, right, top, and bottom surfaces of the battery housing cavity 13. Of course, Figure 5 As an example only, in other examples, the position and number of heating films 3 are designed as needed.

[0046] In the above embodiments, one or more temperature sensors 4 are respectively provided on the surface that is in contact with the heating film 3. For example, an abutment can be provided on the heating film 3, and the temperature sensor 4 can be positioned corresponding to the abutment. Alternatively, the temperature sensor 4 can be positioned on the outside of the heating film 3 to obtain the temperature of the corresponding surface, thereby determining whether heating through the heating film 3 is required. When multiple temperature sensors 4 are provided on any surface, the control module 5 can determine whether heating through the heating film 3 is required based on the average or median of the multiple detected temperatures. The surface that is in contact with the heating film 3 can include the surface of the cell module 2 or the inner surface of the battery housing cavity 13.

[0047] In other embodiments, the surface adhered to the heating film 3 can be divided into a first surface and a second surface. Each first surface is provided with at least one temperature sensor 4, while each second surface is not provided with a temperature sensor. Furthermore, the heating film adhered to the second surface can be connected in series with any of the heating films 3 adhered to the first surface. This configuration allows the heating operation of the heating film 3 adhered to the second surface to be controlled by the temperature sensor 4 on the first surface, which simplifies the circuitry and saves costs. The first surface can be either the outer surface of the cell module 2 or the inner surface of the battery housing cavity 13, and the second surface can also be either the outer surface of the cell module 2 or the inner surface of the battery housing cavity 13; this application does not impose any limitations on this.

[0048] In the above embodiments, such as Figure 6 As shown, the battery pack also includes switches 6. Each switch 6 is electrically connected to the control module 5 and at least one heating film 3. For example, when multiple heating films 3 are connected in series, the same switch 6 can electrically connect multiple heating films 3. The control module 5 controls the on / off state of the switches 6 based on the temperature data detected by the temperature sensor 4, thereby controlling the on / off state between the heating film 3 connected to the switch 6 and the power supply terminal, realizing the on / off response of the heating film 3. With this setting, the temperature distribution of each area can be understood based on the temperature data fed back by the temperature sensor 4. Combined with the suitable operating temperature requirements of the cell module 2, the heating operation of the heating film in each area can be adjusted to meet the precise heating and temperature regulation requirements of the battery pack, reduce the temperature difference between different areas of the cell module 2, and help improve battery life.

[0049] For example, such as Figure 6 As shown, additional heating films 3 are attached to the front, back, left, right, top and bottom surfaces of the cell module 2, and additional heating films 3 are attached to the front, back, left, right, top and bottom surfaces of the battery housing cavity 13. Each heating film 3 is connected in series with a single switch 6, and multiple switches 6 are electrically connected to the control module 5. Multiple temperature sensors 4 detect the temperature of each surface with the heating film 3 attached. The subsequent control module 5 can control one or more heating films 3 to be in a heating state at the same time based on the temperature data of the temperature sensors 4.

[0050] In the example of this application, an insulating layer is provided between two parallel and adjacent heating films 3. The insulating layer increases the insulation performance between adjacent heating films 3 and reduces the risk of short circuit.

[0051] 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.

[0052] This application also provides an electric vehicle. The electric vehicle includes the battery pack described above.

[0053] 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.

[0054] 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: The housing includes a battery housing cavity; A battery cell module, wherein the battery cell module is disposed within the battery housing cavity; Multiple heating films are attached to the inner surface of the battery housing cavity or the outer surface of the cell module, and the multiple outer surfaces of the cell module are covered by the heating films. Multiple temperature sensors, each of which is used to detect the temperature of any surface to which the heating film is attached; The control module controls the connection and disconnection between the heating film and the power supply terminal based on the temperature data detected by the temperature sensor.

2. The battery pack according to claim 1, characterized in that, One or more temperature sensors are respectively disposed on the surface that is in contact with the heating film.

3. The battery pack according to claim 1, characterized in that, The surface that is in contact with the heating film is divided into a first surface and a second surface. At least one temperature sensor is provided on each of the first surfaces, while no temperature sensor is provided on the second surface. The heating film attached to the second surface is connected in series with any heating film attached to the first surface.

4. The battery pack according to claim 1, characterized in that, It also includes multiple switches, each of which is electrically connected to the control module and at least one heating film. The control module controls the on / off state of the switches based on the temperature data detected by the temperature sensor, thereby controlling the connection between the heating film connected to the switch and the power supply terminal.

5. The battery pack according to claim 1, characterized in that, At least one of the multiple heating films is attached to the outer surface of the battery cell module.

6. The battery pack according to claim 5, characterized in that, At least one heating film is attached to a surface of the cell module parallel to the bottom surface of the battery housing cavity; At least one heating film is attached to the surface of the cell module parallel to the side of the battery housing cavity.

7. The battery pack according to claim 1, characterized in that, At least one heating film is attached to the inner surface of the battery housing cavity.

8. The battery pack according to claim 7, characterized in that, At least one heating film is attached to the surface of the battery housing cavity that is perpendicular to the depth direction; At least one heating film is attached to the surface of the battery housing cavity that is parallel to the depth direction.

9. The battery pack according to claim 1, characterized in that, It also includes an insulating layer, with at least one insulating layer disposed between two parallel and adjacent heating films.

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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