Battery pack and vehicle

Abstract

The application provides a battery pack and a vehicle, the battery pack comprising a heating plate, a battery module, an alternating magnetic field generating assembly, an additional magnetic field generating assembly, a temperature sensor and a control module, the temperature sensor collecting the temperature of each battery cell in the battery module and generating a corresponding temperature electric signal, the control module controlling the receiving of the temperature electric signal and controlling the alternating magnetic field generating assembly to generate an alternating magnetic field to heat the battery cell by the magnetic fluid heating, while controlling the additional magnetic field generating assembly to generate an additional magnetic field to drive the nearby magnetic fluid to gather to the battery cell, thereby increasing the heat production near the battery cell, so as to ensure the temperature consistency of each battery cell in the heating process, thereby increasing the cycle life of the battery pack.

Description

Technical Field

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

[0002] In the system technology of electric vehicle power batteries, to improve the low-temperature performance of the battery system and ensure that the battery can be charged quickly and the charging time reduced in cold seasons, heating devices are generally installed in the battery pack. Currently, there are two common types of heating devices: one is heating using a refrigerant, such as common liquid cooling / liquid heating or direct cooling / direct heating devices; the other is resistance heating, such as heating films or positive temperature coefficient (PTC) thermistor heating devices.

[0003] Because the cells in the middle and at both ends of the battery module are in different environments, their temperature rise rates are also different. Since the PTC thermistor heating device lacks adjustability in heating power for different locations, the temperature uniformity of the battery cells in the battery pack is insufficient, affecting the cycle life of the battery pack. Therefore, it is necessary to provide a battery pack and vehicle to improve this deficiency. Summary of the Invention

[0004] Embodiments of the present invention provide a battery pack and vehicle that can ensure temperature consistency of each cell during the heating process, thereby increasing the cycle life of the battery pack.

[0005] An embodiment of the present invention provides a battery pack, the battery pack comprising: A heating plate, wherein the interior of the heating plate has a cavity filled with a magnetic fluid; A battery module is disposed on the heating plate, and the battery module includes multiple battery cells; An alternating magnetic field generating component is arranged around the heating plate, and the alternating magnetic field generating component is used to generate an alternating magnetic field; An additional magnetic field generating component is disposed at the bottom of the heating plate. The additional magnetic field generating component is used to generate an additional magnetic field to change the positional distribution of the magnetofluid within the cavity. A temperature sensor is disposed on the battery cell, and the temperature sensor is used to collect the temperature of the battery cell and generate a corresponding temperature electrical signal; The control module is electrically connected to the battery module, the alternating magnetic field generating component, the additional magnetic field generating component, and the temperature sensor, respectively. The control module is used to receive the temperature electrical signal and control the alternating magnetic field generating component and / or the additional magnetic field generating component to work according to the temperature of the battery cell.

[0006] In one embodiment, the battery module has a plurality of sub-battery modules arranged side by side, each sub-battery module including a plurality of battery cells, and the heating plate having a plurality of cavities corresponding one-to-one with each of the sub-battery modules.

[0007] In one embodiment, the plurality of cavities are not interconnected.

[0008] In one embodiment, the alternating magnetic field generating assembly includes an iron core and an electromagnetic coil, the iron core being disposed around the heating plate and the electromagnetic coil being wound around the outside of the iron core.

[0009] In one embodiment, the additional magnetic field generating assembly includes a plurality of additional magnetic field generating units arranged at intervals between each other. Each additional magnetic field generating unit includes an iron core and an electromagnetic coil, the electromagnetic coil being wound around the outside of the iron core.

[0010] In one embodiment, the heating plate is an extruded part.

[0011] In one embodiment, the magnetic fluid is a ferromagnetic fluid or a nickel magnetic fluid.

[0012] In one embodiment, the battery pack further includes a DC-AC converter, which is electrically connected to the control module and the alternating magnetic field generating component, respectively, for converting the DC power output by the control module into AC power.

[0013] In one embodiment, the battery pack further includes a housing having a receiving space, a heating plate disposed at the bottom of the receiving space, an alternating magnetic field generating component disposed around the housing, and an additional magnetic field generating component disposed at the bottom of the housing.

[0014] Embodiments of the present invention also provide a vehicle, the vehicle including a body and a battery pack as described above, the battery pack being mounted on the vehicle body.

[0015] The beneficial effects of this invention are: In this invention, a cavity is formed inside the heating plate, filled with magnetic fluid, and the battery module is positioned above the heating plate. An alternating magnetic field generating component is arranged around the heating plate, and an additional magnetic field generating component is positioned at the bottom of the heating plate. A temperature sensor collects the temperature of each cell in the battery module and generates a corresponding temperature signal. The control module receives the temperature signal and controls the alternating magnetic field generating component to generate an alternating magnetic field based on the cell temperature, thereby heating the magnetic fluid to maintain the cells at their optimal operating temperature. The control module can also control the additional magnetic field generating component to generate an additional magnetic field to change the positional distribution of the magnetic fluid within the wall, adjusting the heating rate of cells at different temperatures. This ensures the temperature consistency of each cell during the heating process, thereby increasing the cycle life of the battery pack. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A perspective view of a battery pack provided for an embodiment of the present invention; Figure 2 An exploded view of a battery pack provided for an embodiment of the present invention; Figure 3 A schematic diagram of the structure of the heating plate provided in an embodiment of the present invention; Figure 4 A bottom view of a battery pack provided for an embodiment of the present invention.

[0018] The names of the components corresponding to the corresponding reference numerals in the figure are as follows: 100-battery pack, 10-heating plate, 11-cavity, 20-battery module, 21-sub-battery module, 201-cell, 30-alternating magnetic field generating component, 31-first iron core, 32-first electromagnetic coil, 40-additional magnetic field generating component, 41-additional magnetic field generating unit, 411-second iron core, 412-second electromagnetic coil, 50-temperature sensor, 60-control module, 61-master control module, 62-slave control module, 63-bracket, 70-box, 71-accommodating space. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0020] Embodiments of the present invention provide a battery pack, which includes a heating plate, battery modules, an alternating magnetic field generating component, an additional magnetic field generating component, a temperature sensor, and a control module. A cavity is formed inside the heating plate, filled with magnetic fluid, and the battery modules are positioned above the heating plate. The alternating magnetic field generating component is arranged around the heating plate, and the additional magnetic field generating component is positioned at the bottom of the heating plate. The temperature sensor collects the temperature of each cell in the battery module and generates a corresponding temperature signal. The control module receives the temperature signal and controls the alternating magnetic field generating component to generate an alternating magnetic field based on the cell temperature, thereby heating the magnetic fluid and thus the cell. Simultaneously, the control module can control the additional magnetic field generating component to generate an additional magnetic field, driving nearby magnetic fluid to converge towards the cell, increasing the heat generation near the cell, thus ensuring temperature consistency of each cell during the heating process and increasing the cycle life of the battery pack.

[0021] Combination Figure 1 and Figure 2 As shown, Figure 1 A perspective view of a battery pack provided for an embodiment of the present invention. Figure 2 The exploded view of the battery pack provided for an embodiment of the present invention shows that the battery pack 100 includes a heating plate 10 and a battery module 20. The battery module 20 includes a plurality of battery cells 201. The battery module 20 is disposed on the heating plate 10. The heating plate 10 can generate heat under the action of an alternating magnetic field and is used to heat the battery cells 201.

[0022] It should be noted that the battery module 20 being disposed on the heating plate 10 can mean that the battery module 20 is located on the heating plate 10 and is in direct contact with the heating plate 10; or it can mean that the battery module 20 is located on the heating plate 10 and is separated from the heating plate 10 by a tray or other components.

[0023] In the embodiments of this application, the battery module 20 is located on the heating plate 10 and is in direct contact with the heating plate 10. Under this structure, the heat of the heating plate 10 can be directly transferred to the battery module 20, which can not only reduce heat loss, but also increase the heating speed of the battery module 20.

[0024] In the implementation of this application, the battery module 20 has a plurality of sub-battery modules 21 arranged side by side, each sub-battery module 21 including a plurality of battery cells 201, and the heating plate having a plurality of cavities corresponding one-to-one with each of the sub-battery modules.

[0025] like Figure 1 As shown, the battery module 20 has four sub-battery modules 21 arranged side by side, and each sub-battery module 21 has 10 battery cells 201 arranged in sequence. It should be noted that... Figure 1This diagram only illustrates the structure of the battery pack and does not represent the actual number of sub-battery modules 21 in battery module 20 or the number of cells 201 in each sub-battery module 21 in actual applications. In actual applications, the number of sub-battery modules 21 in battery module 20 and the number of cells 201 in each sub-battery module 21 can be set according to requirements, and no restrictions are imposed here.

[0026] like Figure 3 As shown, Figure 3 The schematic diagram of the heating plate provided in the embodiment of the present invention shows that the heating plate 10 has a hollow structure and a cavity 11 inside the heating plate 10, which is filled with magnetic fluid.

[0027] In an embodiment of the present invention, the heating plate has a plurality of cavities corresponding one-to-one with the sub-battery modules.

[0028] like Figure 3 As shown, the heating plate 10 has four cavities 11 as indicated by the dotted lines in the figure. The four cavities 11 are arranged side by side with intervals. Each cavity 11 corresponds to a sub-battery module 21. All four cavities 11 are filled with magnetic fluid, but the magnetic fluid does not completely fill the cavity 11. This ensures the fluidity of the magnetic fluid 11 within the cavity 11, so as to adjust the heating rate of the battery cell 201 at different temperatures.

[0029] In one embodiment, such as Figure 3 As shown, the multiple cavities 11 are independent of each other and are not interconnected. With this structure, the magnetofluid within the multiple cavities 11 can be prevented from flowing into each other, thereby reducing the difficulty of temperature control for different sub-battery modules 21.

[0030] In some other embodiments, the heating plate 10 may have only one cavity 11 through which multiple sub-battery modules 21 can be heated; or, the heating plate 10 may have multiple cavities 11, which are interconnected. In practical applications, the number of cavities in the heating plate 10 and whether the cavities are interconnected can be set according to requirements, and no single limitation is made here.

[0031] In the implementation of the present invention, the heating plate 10 is an extruded part, and a cavity 11 is pulled out by extrusion molding. The cavity 11 is filled with magnetic fluid, and the cavity is sealed by brazing to prevent the magnetic fluid from leaking out.

[0032] Specifically, the heating plate 10 is made of aluminum, and the heating plate 10 is an aluminum extrusion profile. In some other embodiments, the material of the heating plate 10 is not limited to aluminum, but can also be aluminum alloy or other metal materials with good thermal conductivity; this is not a unique limitation.

[0033] In embodiments of the present invention, the magnetic fluid can be a metallic magnetic fluid. Specifically, the magnetic fluid can be either a ferromagnetic fluid or a nickel magnetic fluid.

[0034] In a preferred embodiment, the magnetic fluid is a ferromagnetic fluid. Compared with nickel magnetic fluids and other metal magnetic fluids, ferromagnetic fluids have a lower cost, which can not only ensure the heating performance of the heating plate, but also reduce the cost of the battery pack.

[0035] Furthermore, the battery pack 100 also includes a control module 60 and multiple temperature sensors 50. The control module 60 is disposed within the housing space 71 of the housing 70, and the temperature sensors 50 are disposed on the battery cells 201. The temperature sensors 50 can be used to collect the temperature of the corresponding battery cell 201 and generate corresponding temperature electrical signals. The control module 60 is electrically connected to the multiple temperature sensors 50 to receive the temperature electrical signals collected by the temperature sensors 50.

[0036] In the embodiments of this application, each battery cell 201 is provided with a temperature sensor 50, which can be fixedly mounted on the terminal of the battery cell 201. In some other embodiments, the temperature sensor 50 can also be fixedly mounted on the housing of the battery cell 201, which is not the only one here.

[0037] In the embodiments of this application, the control module 60 is a BMS battery management system. The control module 60 can be fixed to the housing 70 or the battery module 20 by the bracket 63 and is electrically connected to the battery module 20.

[0038] Specifically, the control module 60 may include a master control module 61 and a slave control module 62. The master control module 61 and the slave control module 62 are respectively fixed on the housing 70 or the battery module 20 by different brackets 63. The master control module 61 and the slave control module 62 are respectively electrically connected to the corresponding sub-battery module 21 and can be used to control different sub-battery modules 21.

[0039] Furthermore, such as Figure 1 As shown, the battery pack 100 also includes an alternating magnetic field generating component 30, which is arranged around the heating plate 10. The alternating magnetic field generating component 30 can generate an alternating magnetic field after an alternating current is applied. The magnetofluid within the heating plate 10 generates current due to the alternating magnetic field of the alternating magnetic field generating component 30, and the magnetofluid heats up under its own resistance, thus completing the conversion from electromagnetic energy to thermal energy. The magnetofluid can conduct its own heat through the heating plate 10 to the battery cell 201, thereby heating the battery cell 201.

[0040] The control module 60 is electrically connected to the alternating magnetic field generating component 30. When the temperature sensor 50 detects that the temperature of the battery cell 201 is lower than the preset value, the control module 60 can control the alternating magnetic field generating component 30.

[0041] Specifically, when the temperature sensor 50 detects that the temperature of the battery cell 201 is lower than a preset value, the control module 60 can output alternating current to the alternating magnetic field generating component 30. Under the action of the alternating current, the alternating magnetic field generating component 30 generates an alternating magnetic field, which heats the magnetic fluid in the heating plate 10, thereby heating the battery cell 201. When the temperature sensor 50 detects that the temperature of the battery cell 201 is greater than or equal to the preset value, the control module 60 can stop outputting alternating current to the alternating magnetic field generating component 30.

[0042] In one embodiment, the battery pack further includes a DC-AC converter electrically connected to both the control module 60 and the alternating magnetic field generating component 30, for converting the DC power output by the control module 60 into AC power. Since the battery system outputs DC power, the control module 60 cannot directly output AC power. The DC-AC converter converts the DC power output by the control module 60 into AC power, thereby enabling the alternating magnetic field generating component 30 to generate an alternating magnetic field.

[0043] In the embodiments of this application, the heating power can be changed by adjusting the frequency of the alternating current to regulate the frequency of the high-frequency alternating magnetic field poles, or the heating power can be changed by adjusting the magnitude of the alternating current to regulate the magnetic field strength of the high-frequency alternating magnetic field, thereby achieving precise control of the cell temperature and enabling the cell to be maintained at the optimal operating temperature.

[0044] In the embodiments of this application, combined with Figure 1 and Figure 2 As shown, the battery pack 100 also includes a housing 70, which has a receiving space 71. The heating plate 10 is disposed at the bottom of the receiving space 71, the battery module 20 is disposed on the heating plate 10 inside the receiving space 71, and the alternating magnetic field generating component 30 is disposed outside the housing 70 and surrounds the housing 70. The alternating magnetic field generating component 30 is at a certain distance from the housing 70 and does not directly contact the housing 70.

[0045] In one embodiment, the alternating magnetic field generating assembly includes an iron core and an electromagnetic coil, with the iron core arranged around a heating plate and the electromagnetic coil wound around the outside of the iron core.

[0046] like Figure 4 As shown, Figure 4The battery pack provided in the embodiment of the present invention is shown in a bottom view. The alternating magnetic field generating component 30 includes a first iron core 31 and a first electromagnetic coil 32. The first iron core 31 is disposed outside the housing 70 and surrounds the housing 70. The first electromagnetic coil 32 is wound around the outside of the iron core 31. The first electromagnetic coil 32 can be electrically connected to the control module 60 or a DC-AC converter to receive the current output by the control module 60.

[0047] Furthermore, the battery pack also includes an additional magnetic field generating component, which is located at the bottom of the heating plate and is used to generate an additional magnetic field to change the positional distribution of the magnetofluid within the cavity.

[0048] like Figure 2 As shown, the battery pack 100 also includes an additional magnetic field generating component 40, which is disposed at the bottom of the heating plate 10. The additional magnetic field generating component 40 is electrically connected to the control module 60. Under the control of the control module 60, the additional magnetic field generating component 40 can generate an additional magnetic field to change the position distribution and concentration distribution of the magnetofluid in the cavity.

[0049] Furthermore, the additional magnetic field generating assembly includes multiple additional magnetic field generating units arranged at intervals between each other. Each additional magnetic field generating unit includes an iron core and an electromagnetic coil, with the electromagnetic coil wound around the outside of the iron core.

[0050] like Figure 4 As shown, the auxiliary magnetic field generating assembly 40 includes multiple auxiliary magnetic field generating units 41 arranged at intervals along the column direction. Each auxiliary magnetic field generating unit 41 consists of a second iron core 411 and a second electromagnetic coil 412. The second iron core 411 is elongated, and the second electromagnetic coil 412 is wound around the outside of the second iron core 411. Multiple magnetic field generating units 41 located in the same column correspond to the same sub-battery module, and each magnetic field generating unit 41 can correspond to one or more battery cells.

[0051] When the temperature sensor 50 detects that the temperature of a certain cell is lower than that of other cells, the control module 60 can control the magnetic field generating unit 41 corresponding to that cell in the additional magnetic field generating assembly 40 to work and generate an additional magnetic field. Through the magnetic force of the additional magnetic field on the magnetic fluid, the position distribution of the magnetic fluid in the cavity 11 can be changed, so that more magnetic fluid flows from the cell with a higher temperature to the cell with a lower temperature. Since the magnetic fluid itself is heating up, the cell with a lower temperature is heated by more magnetic fluid, and the temperature rises faster. The magnetic fluid near the cell with a higher temperature decreases, and the temperature rises slower. Finally, the temperature of each cell tends to be consistent, thereby ensuring the temperature consistency of each cell during the heating process.

[0052] In the embodiments of this application, the additional magnetic field generating component 40 is disposed at the bottom of the housing 70. With this structure, only the alternating magnetic field generating component 30 and the additional magnetic field generating component 40 need to be disposed on the outside of the housing 70 to achieve the effect of heating the battery cell by controlling the magnetic field with the heating plate 10. This avoids the decrease in energy density of the battery pack caused by adding the alternating magnetic field generating component 30 and the additional magnetic field generating component 40, and also eliminates the need to modify the existing housing structure, thereby reducing the cost of the battery pack.

[0053] In some other embodiments, at least one of the alternating magnetic field generating component 30 and the auxiliary magnetic field generating component 40 may be disposed within the receiving space 71 of the housing 70. For example, the alternating magnetic field generating component 30 may be disposed around the heating plate 10 along the inner wall of the receiving space 71 of the housing 70, and the auxiliary magnetic field generating component 40 may be disposed at the bottom of the housing 70; or, the alternating magnetic field generating component 30 may be disposed outside the housing 70, the auxiliary magnetic field generating component 40 may be disposed at the bottom of the receiving space 71 of the housing 70, and the heating plate 10 may be disposed above the auxiliary magnetic field generating component 40.

[0054] According to the battery pack provided in the above embodiments of the present invention, the present invention also provides a vehicle, the vehicle including a body and a battery pack, the battery pack being installed on the vehicle body, the structure of the body can refer to the structure of the body of an existing vehicle, and is not limited here, the battery pack is the battery pack 100 provided in the above embodiments, and will not be specifically described here.

[0055] The beneficial effects of this invention are as follows: In this invention, a cavity is formed inside the heating plate, filled with magnetic fluid, and the battery module is placed above the heating plate. An alternating magnetic field generating component is arranged around the heating plate, and an additional magnetic field generating component is placed at the bottom of the heating plate. The temperature of each cell in the battery module is collected by a temperature sensor and a corresponding temperature signal is generated. The control module receives the temperature signal and controls the alternating magnetic field generating component to generate an alternating magnetic field according to the temperature of the cell, so that the magnetic fluid heats up the cell. At the same time, the control module can also control the additional magnetic field generating component to generate an additional magnetic field to drive the nearby magnetic fluid to converge towards the cell, increasing the heat generation near the cell. This ensures the temperature consistency of each cell during the heating process, thereby increasing the cycle life of the battery pack.

[0056] The embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A battery pack, characterized in that, include: A heating plate, wherein the interior of the heating plate has a cavity filled with a magnetic fluid; A battery module is disposed on the heating plate, and the battery module includes multiple battery cells; An alternating magnetic field generating component is arranged around the heating plate, and the alternating magnetic field generating component is used to generate an alternating magnetic field to heat the magnetofluid; An additional magnetic field generating component is disposed at the bottom of the heating plate. The additional magnetic field generating component is used to generate an additional magnetic field to change the positional distribution of the magnetofluid in the cavity. The additional magnetic field generating component includes a plurality of additional magnetic field generating units arranged at intervals between each other, and each magnetic field generating unit corresponds to at least one of the battery cells. A temperature sensor is disposed on the battery cell, and the temperature sensor is used to collect the temperature of the battery cell and generate a corresponding temperature electrical signal; The control module is electrically connected to the battery module, the alternating magnetic field generating component, the additional magnetic field generating component, and the temperature sensor, respectively. The control module is used to receive the temperature electrical signal and control the alternating magnetic field generating component and / or the additional magnetic field generating component to work according to the temperature of the battery cell.

2. The battery pack as described in claim 1, characterized in that, The battery module has multiple sub-battery modules arranged side by side, each sub-battery module including multiple battery cells, and the heating plate has multiple cavities corresponding to each sub-battery module.

3. The battery pack as described in claim 2, characterized in that, The multiple cavities are not interconnected.

4. The battery pack as described in claim 1, characterized in that, The alternating magnetic field generating component includes an iron core and an electromagnetic coil. The iron core is arranged around the heating plate, and the electromagnetic coil is wound around the outside of the iron core.

5. The battery pack as described in claim 1, characterized in that, The additional magnetic field generating unit includes an iron core and an electromagnetic coil, with the electromagnetic coil wound around the outside of the iron core.

6. The battery pack as described in claim 1, characterized in that, The heating plate is an extruded part.

7. The battery pack as described in claim 1, characterized in that, The magnetic fluid is a ferromagnetic fluid or a nickel magnetic fluid.

8. The battery pack according to any one of claims 1 to 7, characterized in that, The battery pack also includes a DC-AC converter, which is electrically connected to the control module and the alternating magnetic field generating component, respectively, and is used to convert the DC power output by the control module into AC power.

9. The battery pack as claimed in claim 1, characterized in that, The battery pack also includes a housing with a receiving space, a heating plate disposed at the bottom of the receiving space, an alternating magnetic field generating component disposed around the housing, and an additional magnetic field generating component disposed at the bottom of the housing.

10. A vehicle, characterized in that, It includes a vehicle body and a battery pack as described in any one of claims 1 to 9, the battery pack being mounted on the vehicle body.

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