Battery device, heating method thereof, and electric appliance

Abstract

The application discloses a battery device, a heating method thereof and a power consumption equipment. When a heating system comprises an electromagnetic external heating device and a high-frequency internal heating device, the electromagnetic external heating device is based on an electromagnetic heating principle, the heating mode can be understood as an external heating mode, the high-frequency internal heating device is based on a high-frequency alternating current internal heating principle, the heating mode can be understood as an internal heating mode, so that the heating efficiency can be improved by combining the external heating mode and the internal heating mode, the battery pack in the battery device can be rapidly heated, and the endurance of the power consumption equipment is improved on the basis of improving the performance of the battery device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery device, a heating method thereof and an electric equipment. BACKGROUND

[0002] Due to the reduced activity of the power battery in a low temperature state (i.e. a lower ambient temperature), the capacity and performance of the power battery in the low temperature state are seriously attenuated, and the attenuation is irreversible, which causes the new energy vehicle to have a serious reduction in the cruising range.

[0003] In order to avoid the above situation, the power battery can be heated in the low temperature state to avoid the serious attenuation of the capacity and performance of the battery. Then, how to heat the power battery is a technical problem to be solved by those skilled in the art. SUMMARY

[0004] The embodiments of the present application provide a battery device, a heating method thereof and an electric equipment, to heat the battery device in a low temperature environment.

[0005] In a first aspect, the embodiments of the present application provide a battery device, comprising: a battery pack and a heating system, the battery pack comprising at least two batteries, the heating system comprising an electromagnetic external heating device and a high-frequency internal heating device, the heating system being arranged outside the battery pack.

[0006] The pole of the battery is electrically connected to the high-frequency internal heating device, and the high-frequency internal heating device is configured to provide a high-frequency alternating current signal to the battery and heat the battery by using the internal resistance of the battery.

[0007] The electromagnetic external heating device is configured to provide an alternating magnetic field to the battery pack and heat the battery pack.

[0008] In this way, when the heating system comprises the electromagnetic external heating device and the high-frequency internal heating device, the electromagnetic external heating device is based on the principle of electromagnetic heating, which can be understood as an external heating method, and the high-frequency internal heating device is based on the principle of high-frequency alternating internal heating, which can be understood as an internal heating method. Therefore, by combining the external heating method and the internal heating method, the heating efficiency can be improved, the battery pack in the battery device can be quickly heated, and the performance of the battery device can be improved.

[0009] In a second aspect, the embodiments of the present application provide an electric equipment, comprising the above-mentioned battery device provided by the embodiments of the present application.

[0010] Thus, when the heating system comprises the electromagnetic external heating device and the high-frequency internal heating device, the electromagnetic external heating device is based on the electromagnetic heating principle, and the heating method can be understood as an external heating method; the high-frequency internal heating device is based on the high-frequency alternating current internal heating principle, and the heating method can be understood as an internal heating method; therefore, by combining the external heating method and the internal heating method, the heating efficiency can be improved, the battery pack in the battery device can be rapidly heated, and the endurance of the electric equipment can be improved on the basis of improving the performance of the battery device.

[0011] In a third aspect, an embodiment of the present application provides a heating method of the battery device provided by the embodiment of the present application, comprising:

[0012] The high-frequency internal heating device provides a high-frequency alternating current signal to the battery, and / or the electromagnetic external heating device provides an alternating magnetic field to the battery pack to heat the battery pack.

[0013] Thus, when the heating system comprises the electromagnetic external heating device and the high-frequency internal heating device, the electromagnetic external heating device is based on the electromagnetic heating principle, and the heating method can be understood as an external heating method; the high-frequency internal heating device is based on the high-frequency alternating current internal heating principle, and the heating method can be understood as an internal heating method; therefore, by combining the external heating method and the internal heating method, the heating efficiency can be improved, the battery pack in the battery device can be rapidly heated, and the endurance of the electric equipment can be improved on the basis of improving the performance of the battery device. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0015] Figure 2 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0016] Figure 3 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0017] Figure 4 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0018] Figure 5 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0019] Figure 6 FIG. 1 is a structural schematic diagram of a heating system provided in an embodiment of the present application;

[0020] 10 - electromagnetic external heating device, 11 - power module, 12 - electromagnetic module, 20 - high-frequency internal heating device, 21 - high-frequency control module, 22 - signal output module, 30 - battery management system, 101 - battery device, 102 - fuel heating device, 1021 - fuel heater, 1022 - radiator, 1023 - liquid flow pipeline, 103 - passenger cabin, 104 - fuel tank, m - battery pack, n - heating system. DETAILED DESCRIPTION

[0021] The specific embodiments of a battery device, a heating method thereof and an electric equipment provided by the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0022] The embodiments of the present application provide a battery device, as shown in the accompanying drawings, which can include: a battery pack m and a heating system n, the battery pack m includes at least two batteries (wherein, Figure 1 the battery is not shown in the drawings), and the heating system n includes an electromagnetic external heating device 10 and a high-frequency internal heating device 20, the heating system n is arranged outside the battery pack m. Figure 1

[0023] The pole of the battery (not shown in the drawings) is electrically connected with the high-frequency internal heating device 20, and the high-frequency internal heating device 20 is used to provide a high-frequency alternating current signal to the battery and heat the battery by using the internal resistance of the battery.

[0024] The electromagnetic external heating device 10 is used to provide an alternating magnetic field to the battery pack m and heat the battery pack m.

[0025] It should be noted that, in Figure 1 , the dashed line between the electromagnetic external heating device 10 and the battery pack m does not mean that there is an electrical connection relationship between the electromagnetic external heating device 10 and the battery pack m, but means that the electromagnetic external heating device 10 can provide an alternating magnetic field to the battery pack m; similarly, the dashed line in the following Figure 2 has the same meaning as the dashed line in Figure 1 .

[0026] In addition, the solid line between the high-frequency internal heating device 20 and the battery pack m means that there is an electrical connection relationship between the high-frequency internal heating device 20 and the battery pack m, and further means that the high-frequency internal heating device 20 has an electrical connection relationship with the pole of the battery, so that the high-frequency internal heating device 20 can provide a high-frequency alternating current signal to the battery.

[0027] ​The high-frequency internal heating device is based on a high-frequency alternating internal heating principle, and the specific principle can include:

[0028] When the internal resistance of the battery is used as the internal resistance of the battery, Q=I 2 *R*t can be used to achieve self-heating of the current;

[0029] That is, when a high-frequency alternating signal is provided to the battery, the battery as an internal resistance can generate Joule heat, and in a low temperature state (i.e. a state in which the battery is at a low temperature environment, so that the temperature of the battery is low) The internal resistance of the battery is large, according to the formula Q=I 2 *R*t, it can be concluded that the Joule heat generated in the low temperature state will be more, so that the Joule heat can achieve self-heating (i.e. internal heating) of the battery.

[0030] Note that considering the lithium precipitation problem of the battery in a low temperature state, the battery allows a small charging and discharging current, and by using a high-frequency pulse, a large current charging and discharging can be achieved. In high frequency, most of the current is through a non-Faraday path (i.e. an electric double layer), so the Faraday current will be very small, and the possibility of lithium precipitation is very low, so that while achieving internal heating of the battery, lithium precipitation of the battery can be avoided.

[0031] The electromagnetic external heating device is based on the principle of electromagnetic induction heating, and the specific principle can include:

[0032] When the conductor is in an alternating magnetic field, an electric current will be induced in the conductor, thereby generating Joule heat;

[0033] Therefore, when an alternating magnetic field is provided to the battery pack, an electric current can be induced in the conductor in the battery pack, and the battery is heated by the Joule heat (i.e. external heating).

[0034] In this way, when the heating system includes an electromagnetic external heating device and a high-frequency internal heating device, by combining the external heating method and the internal heating method, the heating efficiency can be improved, the battery pack can be quickly heated, and the performance of the battery pack can be improved.

[0035] In some embodiments, the electrical connection method of the battery pack and the high-frequency internal heating device can include:

[0036] When each battery in the battery pack has a positive pole and a negative pole, the high-frequency internal heating device can be electrically connected to the positive pole and the negative pole of each battery, respectively, to provide a high-frequency alternating signal to each battery in the battery pack by the high-frequency internal heating device;

[0037] Alternatively, when the battery pack includes a total positive transmission end and a total negative transmission end, and each battery in the battery pack is electrically connected, the high-frequency internal heating device can be electrically connected to the total positive transmission end and the total negative transmission end respectively, so as to realize that the high-frequency internal heating device provides a high-frequency alternating current signal for each battery in the battery pack.

[0038] Alternatively, when the battery device has a positive electrode end and a negative electrode end, and each battery pack is electrically connected, and each battery in the battery pack is electrically connected, the high-frequency internal heating device can be electrically connected to the positive electrode end and the negative electrode end respectively, so as to realize that the high-frequency internal heating device provides a high-frequency alternating current signal for each battery in the battery pack.

[0039] In some embodiments, as shown in FIG. 1, the high-frequency internal heating device 20 includes a high-frequency control module 21 and a signal output module 22 electrically connected. Figure 2

[0040] The high-frequency control module 21 is configured to output a control signal to the signal output module 22.

[0041] The pole is electrically connected to the signal output module 22, and the signal output module 22 is configured to provide a high-frequency alternating current signal to the battery when receiving the control signal.

[0042] The high-frequency control module can include, but is not limited to, a microprocessor or a central processing unit, etc.

[0043] The specific structure of the signal output module can adopt any structure known to those skilled in the art that can output a high-frequency alternating current signal, which is not limited herein.

[0044] In this way, the high-frequency control module and the signal output module can realize the function of the high-frequency internal heating device, thereby realizing the internal heating of the battery.

[0045] In addition, through the control of the high-frequency control module, intelligent control of internal heating can be realized, and the operation is convenient, simple and easy to realize, and the sensitivity of the control is high, so that precise control can be realized.

[0046] In some embodiments, as shown in FIG. 2, the electromagnetic external heating device 10 includes a power module 11 and an electromagnetic module 12 electrically connected. Figure 2

[0047] The power module 11 is configured to output an alternating signal to the electromagnetic module 12.

[0048] The electromagnetic module 12 is configured to provide an alternating magnetic field to the battery pack m based on the alternating signal.

[0049] The specific structure of the power module can adopt any structure known to those skilled in the art that can output an alternating signal, which is not limited herein. ​​

[0050] The electromagnetic module may, but not limited to, include an electromagnetic induction coil.

[0051] In this way, through the power module and the electromagnetic module, the function of the electromagnetic external heating device can be realized, so as to realize the external heating of the battery pack.

[0052] And through the control of the power module, intelligent control of external heating can be realized, and the operation is convenient, simple and easy to realize, and the sensitivity of the control is high, so that precise control can be realized.

[0053] In some embodiments, as shown in Figure 2 Also includes a battery management system 30;

[0054] The high-frequency internal heating device 20 includes a high-frequency control module 21, and the high-frequency control module 21 and the power module 11 are electrically connected with the battery management system 30;

[0055] The battery management system 30 is used for:

[0056] Controlling the high-frequency control module 21 to output a control signal, and controlling the power module 11 to output an alternating signal.

[0057] In this way, through the power management system, the high-frequency control module can be controlled to output a control signal, and the power module can be controlled to output an alternating signal, and then the heating mode for the battery pack can be controlled to meet the needs of different application scenarios and improve the flexibility of design.

[0058] In some embodiments, the frequency of the alternating signal can be 33KHz to 38KHz, and the value of the alternating signal can be 5A to 9A.

[0059] And in some embodiments, the frequency of the high-frequency alternating signal can be 65Hz to 75Hz, and the value of the high-frequency alternating signal can be 20A to 30A.

[0060] In this way, by setting the frequency of the alternating signal, the value of the alternating signal, the frequency of the high-frequency alternating signal, and the value of the high-frequency alternating signal, the internal heating and external heating can be realized, and the damage to the battery itself can be avoided, and the performance of the battery itself can be ensured. not affected.

[0061] In some embodiments, the heating mode for the battery pack can include the following:

[0062] Mode 1: Internal heating and external heating are started at the same time.

[0063] Combined with Figure 2 As shown.

[0064] When the ambient temperature of the battery pack m is less than or equal to a first preset value (for example, but not limited to, -10°C), the battery management system 30 controls the high-frequency control module 21 to output a control signal, and controls the power supply module 11 to output an alternating signal, so that the signal output module 22 provides a high-frequency alternating signal to the battery while the electromagnetic module 12 provides an alternating magnetic field to the battery pack m, thereby heating the battery pack m from the inside and the outside at the same time.

[0065] That is, in this mode 1, the internal heating and the external heating are started at the same time and performed at the same time, thereby heating the battery pack m, so that the temperature of the battery pack m can be quickly raised.

[0066] When the temperature of the battery pack m is raised to a second preset value (for example, but not limited to, 5°C), the battery management system 30 can control the high-frequency control module 21 to stop outputting the control signal, and control the power supply module 11 to stop outputting the alternating signal, that is, to stop heating the battery pack m.

[0067] It should be noted that when the temperature of the battery pack m is raised to the second preset value, it means that the temperature of the battery pack m is no longer in a low-temperature state, and at this time, the temperature of the battery pack m has little effect on the capacity and performance of the battery pack m, so that the capacity and performance of the battery pack m can be maintained at a relatively optimal level, and therefore the heating of the battery pack m can be stopped at this time.

[0068] Mode 2: The internal heating and the external heating are not started at the same time.

[0069] In combination with Figure 2 As shown in the figure, in this mode 2, the following cases can be included:

[0070] Case 1:

[0071] When the ambient temperature of the battery pack m is greater than the first preset value and less than the second preset value, the battery management system 30 controls the high-frequency control module 21 to output a control signal, and controls the power supply module 11 to not output an alternating signal, so that the signal output module 22 provides a high-frequency alternating signal to the battery, and the electromagnetic module 12 does not provide an alternating magnetic field to the battery pack m, thereby only heating the battery pack m from the inside, but not from the outside.

[0072] The reason for such a setting is:

[0073] When the ambient temperature is greater than the first preset value and less than the second preset value, it means that the ambient temperature of the battery pack m is not very low, and the efficiency of internal heating is generally high, so that the temperature of the battery pack m can be quickly raised by only internal heating, and such a setting can also be beneficial to reduce the power consumption of the heating system, thereby achieving the rapid temperature rise of the battery pack m under low power consumption.

[0074] Of course, when the temperature of the battery pack m increases to the second preset value, the battery management system 30 can control the high-frequency control module 21 to stop outputting the control signal, that is, to stop heating the battery pack m.

[0075] Case 2:

[0076] This case 2 is similar to the aforementioned case 1, and the difference is that:

[0077] When the ambient temperature of the battery pack m is greater than the first preset value and less than the second preset value, the battery management system 30 controls the high-frequency control module 21 not to output the control signal, and controls the power supply module 11 to output the alternating signal, so that the signal output module 22 does not provide the high-frequency alternating signal to the battery, and the electromagnetic module 12 provides the alternating magnetic field to the battery pack m, so that only external heating is performed on the battery pack m, and internal heating is not performed.

[0078] In this way, the needs of different application scenarios can be met, and the flexibility of design is improved.

[0079] Case 3:

[0080] When the ambient temperature of the battery pack m is less than or equal to the first preset value, the battery management system 30 can first control the high-frequency control module 21 to output the control signal, so that the signal output module 22 provides the high-frequency alternating signal to the battery, thereby first performing internal heating on the battery pack m.

[0081] With the increase of the heating time, the temperature of the battery pack m increases, and when the preset judgment time is reached, the temperature of the battery pack m is collected, and it is judged whether the collected temperature is greater than the first preset value;

[0082] If it is greater, it means that the temperature of the battery pack m has increased greatly, and the current temperature of the battery pack m is not very low, so at this time the battery management system 30 can continue to control the high-frequency control module 21 to output the control signal, and control the power supply module 11 to continue not to output the alternating signal, so that internal heating can be continued, and external heating is still not started.

[0083] If it is not greater, it means that although the temperature of the battery pack m has increased, the current temperature of the battery pack m is still low, so at this time the battery management system 30 can continue to control the high-frequency control module 21 to output the control signal, and control the power supply module 11 to output the alternating signal, so that internal heating can be continued, and external heating is started.

[0084] The advantage of such setting is that:

[0085] When the temperature of battery pack m is low, the internal resistance of the battery is high. Therefore, internal heating is used first, which can help the battery pack m heat up quickly. Then, external heating is activated when certain conditions are met. This external heating not only provides heat to the battery pack m, but also keeps it warm. Under the action of the electromagnetic external heating device 10, the temperature around the battery pack m is higher than the ambient temperature, which makes it difficult for the heat of the battery pack m to be lost. At the same time, it can prevent cold air from entering the battery pack m. Thus, the synergistic effect of the two heating methods achieves the effect of internal heating and external heat preservation, effectively improving the heating efficiency.

[0086] Scenario 4:

[0087] When the ambient temperature of the battery pack m is less than or equal to the first preset value, the battery management system 30 can first control the power module 11 to output an alternating signal, so that the electromagnetic module 12 provides an alternating magnetic field to the battery pack m, thereby first heating the battery pack m externally.

[0088] As the heating time increases, the temperature of battery pack m will increase accordingly. When the preset judgment time is reached, the temperature of battery pack m is collected, and it is determined whether the collected temperature is greater than the first preset value.

[0089] If it is greater than, it means that the temperature of battery pack m has increased significantly and the current temperature of battery pack m is not very low. Therefore, the battery management system 30 can continue to control the power module 11 to output alternating signals and control the high-frequency control module 21 to continue not to output control signals, so that external heating can continue to be used for heating, while the internal heating method will not be activated.

[0090] If the temperature is not greater than the specified value, it indicates that although the temperature of battery pack m has increased, the current temperature of battery pack m is still low. Therefore, the battery management system 30 can continue to control the power module 11 to output alternating signals and control the high-frequency control module 21 to output control signals, so that external heating can continue to be used for heating, while internal heating is also started. Under the combined effect of internal heating and external heating, battery pack m is heated.

[0091] The advantage of this setup is that:

[0092] First, the battery pack is heated by external heating, which can avoid damage to the battery itself; later, when certain conditions are met, internal heating is started, so that the external heating method not only provides heat for the battery pack m to heat, but also provides heat preservation for the battery pack m, so that the temperature around the battery pack m is higher than the ambient temperature under the action of the electromagnetic external heating device 10, thereby the heat of the battery pack m is not easily lost, and at the same time, it can be ensured that the cold air outside will not enter the battery pack m, so as to realize the effect of internal heating and external heat preservation under the synergistic action of the two heating methods, and effectively improve the heating efficiency.

[0093] Of course, when the temperature of the battery pack m rises to the second preset value, the battery management system 30 can control the high-frequency control module 21 to stop outputting the control signal, and if the external heating is started, the power module 11 is also controlled to stop outputting the alternating signal, that is, to stop heating the battery pack m.

[0094] In actual situations, the way to heat the battery pack m is not limited to the above two ways, but can also be set to other ways, as long as it can heat the battery pack m, which belongs to the protection scope of the embodiments of the present application.

[0095] In combination with Figure 2 As shown in the figure, some other ways are listed below.

[0096] When the ambient temperature of the battery pack m is less than or equal to the first preset value, the battery management system 30 can first control the high-frequency control module 21 to output the control signal, so as to first adopt the internal heating method to heat;

[0097] After a period of heating, the battery management system 30 controls the high-frequency control module 21 to stop outputting the control signal, and controls the power module 11 to output the alternating signal, so as to stop internal heating and then adopt the external heating method to heat.

[0098] The specific embodiments are given below for illustration.

[0099] Taking three ways of only using internal heating, only external heating, and combining internal heating and external heating as examples for comparison and illustration.

[0100] 1. When only the internal heating method is used, the specific results can be seen in Table 1, where frequency 2 represents the frequency of the high-frequency alternating current signal, the unit can be Hz, current 2 represents the current value of the high-frequency alternating current signal, the unit can be A, capacity retention rate represents the capacity retention rate of the battery device after 1000 cycles, and the unit of temperature rise rate can be ℃ / min.

[0101] Table 1

[0102] Figure 2 Figure 2 Frequency 2 Current 2 Rate of temperature increase 1 65 20 1.5 94％ 2 70 25 2.1 94％ 3 75 30 2.6 94％ 4 65 30 2.2 94％

[0103] As can be seen from Table 1:

[0104] When the frequency of the high-frequency alternating signal is 75 Hz and the current value is 30 A, the temperature rising rate is the fastest, which can reach 2.6℃ per minute, and has a faster heating rate, and the capacity retention rate is also better.

[0105] 2. When only the external heating mode is used, the specific results can be seen in Table 2, wherein frequency 1 represents the frequency of the alternating signal, which can be in KHz, current 1 represents the current value of the alternating signal, which can be in A, capacity retention rate represents the capacity retention rate of the battery device after 1000 cycles, and the temperature rising rate can be in ℃ / min.

[0106] Table 2

[0107] Capacity retention rate Figure 3 Figure 4 Figure 5 Figure 6 1 33 5 2.4 94％ 2 35 7 3 93.5％ 3 38 9 3.5 93.5％ 4 33 9 3.1 93.5％

[0108] As can be seen from Table 2:

[0109] When the frequency of the alternating signal is 38 KHz and the current value is 9 A, the temperature rising rate is the fastest, which can reach 3.5℃ per minute, and has a faster heating rate, and the capacity retention rate is also better.

[0110] 3. When the internal heating and the external heating are combined, and the above-mentioned case 3 is used to heat the battery pack, the specific results can be seen in Table 3.

[0111] Table 3

[0112]

[0113]

[0114] As can be seen from Table 3:

[0115] When the battery pack is below-10℃, the battery pack is heated by the above-mentioned case 3, and by setting the frequency and the current value, the battery pack can be heated by more than 4℃ per minute, which is much higher than the temperature rising rate when only the internal heating or only the external heating is used, which shows that when the internal heating and the external heating are combined, the rapid heating of the battery pack can be realized, and the heating efficiency is improved.

[0116] Moreover, when the temperature rising rate is too fast, the diaphragm and the electrolyte in the battery can be damaged, which can easily cause thermal runaway and lead to the performance degradation of the battery, such as the parameters in the No. 12 group in Table 3, the temperature rising rate reaches 7.2℃ / min, and the capacity retention rate has a significant decrease.

[0117] If the heating rate is about 5℃, the capacity retention rate is still good and stable.

[0118] Therefore, when setting the alternating signal and the high-frequency alternating signal, the setting can be made according to actual needs.

[0119] In some embodiments, the output power of the electromagnetic external heating device and the high-frequency internal heating device can be adjustable, i.e., non-fixed, so as to realize different heating rates to meet the needs of different working conditions and improve the flexibility of design.

[0120] The specific output power can be set according to actual needs, which is not limited herein.

[0121] In some embodiments, the battery device can be a battery pack, in which case:

[0122] The battery pack can include a box body and a battery module or a battery pack located in the box body. The electromagnetic external heating device can be located in the box body, and the electromagnetic external heating device can be located between the battery module or the battery pack and the box body.

[0123] For example, when the box body includes a side wall, a bottom plate and a box cover, the electromagnetic external heating device can be located between:

[0124] the side wall and the battery module or the battery pack;

[0125] or, between the bottom plate and the battery module or the battery pack;

[0126] or, between the box cover and the battery module or the battery pack.

[0127] The setting position of the electromagnetic external heating device can be set according to actual needs, which is not limited herein.

[0128] And, the setting position of the high-frequency internal heating device is not limited herein, which can be set at any position in the box body according to actual needs.

[0129] Of course, in some embodiments, the battery device is not limited to the battery pack, but can also be other structures that can realize the battery device, which is not limited herein.

[0130] Based on the same inventive concept, the embodiments of the present application provide a heating method for the above-mentioned battery device provided by the embodiments of the present application, which includes:

[0131] The high-frequency internal heating device provides a high-frequency alternating signal to the battery, and / or the electromagnetic external heating device provides an alternating magnetic field to the battery pack to heat the battery pack.

[0132] When heating the battery pack, it can include:

[0133] The high-frequency internal heating device provides a high-frequency alternating current signal to the battery;

[0134] Alternatively, the electromagnetic external heating device provides an alternating magnetic field to the battery pack.

[0135] Alternatively, the high-frequency internal heating device provides a high-frequency alternating current signal to the battery, and the electromagnetic external heating device provides an alternating magnetic field to the battery pack.

[0136] The selection of the heating mode can be set according to actual needs, and is not limited herein.

[0137] Thus, when the heating system includes the electromagnetic external heating device and the high-frequency internal heating device, the electromagnetic external heating device is based on the electromagnetic heating principle, which can be understood as an external heating mode, and the high-frequency internal heating device is based on the high-frequency alternating internal heating principle, which can be understood as an internal heating mode. Therefore, by combining the external heating mode and the internal heating mode, the heating efficiency can be improved, the battery pack can be quickly heated, and the performance of the battery pack can be improved.

[0138] In some embodiments, the high-frequency internal heating device provides a high-frequency alternating current signal to the battery, and / or the electromagnetic external heating device provides an alternating magnetic field to the battery pack, specifically including:

[0139] When the environment of the battery pack is less than or equal to a first preset value, the high-frequency internal heating device first provides a high-frequency alternating current signal to the battery; when a preset judgment time is reached and it is determined that the current state of the battery pack meets a preset condition, the high-frequency internal heating device continues to provide a high-frequency alternating current signal to the battery, and the electromagnetic external heating device provides an alternating magnetic field to the battery pack; when the judgment time is reached and it is determined that the current state of the battery pack does not meet the preset condition, the high-frequency internal heating device continues to provide a high-frequency alternating current signal to the battery.

[0140] Thus, it can be determined when the high-frequency internal heating device is started (wherein the start of providing the high-frequency alternating current signal can be understood as starting), and when the electromagnetic external heating device is started (wherein the start of providing the alternating magnetic field can be understood as starting), and then it can be determined when the internal heating mode is used and when the external heating mode is used, so that a more appropriate heating mode can be selected for the heating of the battery pack, the heating rate can be improved to achieve rapid heating, and the power consumption of the heating system can also be reduced.

[0141] In some embodiments, the high-frequency internal heating device provides a high-frequency alternating current signal to the battery, and / or the electromagnetic external heating device provides an alternating magnetic field to the battery pack, specifically including:

[0142] When the environment temperature of the battery pack is less than or equal to a first preset value, the high-frequency internal heating device provides a high-frequency alternating current signal to the battery, and the electromagnetic external heating device provides an alternating magnetic field to the battery pack.

[0143] In this way, when the ambient temperature of the battery pack is less than or equal to the first preset value, the internal heating and the external heating can be started at the same time, so that the high-frequency internal heating device and the electromagnetic external heating device can be started at the same time, so as to realize rapid heating of the battery pack and improve the heating efficiency.

[0144] In some embodiments, the high-frequency internal heating device provides the battery with a high-frequency alternating current signal, and / or the electromagnetic external heating device provides the battery pack with an alternating magnetic field, specifically including:

[0145] When the ambient temperature of the battery pack is less than or equal to the first preset value, the electromagnetic external heating device first provides the battery pack with an alternating magnetic field;

[0146] When the preset determination time is reached and it is determined that the current state of the battery pack meets the preset condition, the electromagnetic external heating device continues to provide the battery pack with an alternating magnetic field, and the high-frequency internal heating device provides the battery with a high-frequency alternating current signal; when the determination time is reached and it is determined that the current state of the battery pack does not meet the preset condition, the electromagnetic external heating device continues to provide the battery pack with an alternating magnetic field.

[0147] In this way, the method of first using external heating and then using internal heating can avoid the battery from being damaged due to rapid temperature rise, and can avoid the performance of the battery from being affected, thereby improving the reliability of the battery device.

[0148] In some embodiments, the high-frequency internal heating device provides the battery with a high-frequency alternating current signal, and / or the electromagnetic external heating device provides the battery pack with an alternating magnetic field, specifically including:

[0149] When the ambient temperature is greater than the first preset value and less than a second preset value, the high-frequency internal heating device provides the battery with a high-frequency alternating current signal, or the electromagnetic external heating device provides the battery pack with an alternating magnetic field; the first preset value is less than the second preset value.

[0150] In this way, when the ambient temperature is greater than the first preset value and less than the second preset value, it indicates that the temperature of the battery device is not very low, and at this time, only external heating or internal heating is needed, which can realize heating of the battery device while reducing power consumption.

[0151] In some embodiments, the first preset value is any value in -15℃ to -10℃, and the second preset value is any value in 5℃ to 8℃.

[0152] For example, the first preset value can be but is not limited to -10℃, and the second preset value can be but is not limited to 5℃, and the first preset value and the second preset value can be set according to actual needs, which are not limited herein.

[0153] In some embodiments, the preset condition includes:

[0154] When the temperature of the battery pack is collected at the judgment time, the collected temperature of the battery pack is less than or equal to the first preset value.

[0155] When the temperature of the battery pack is collected at the judgment time, the collected temperature of the battery pack is less than or equal to the first preset value, which means that even if the battery pack is heated by the internal heating mode, the temperature of the battery pack is still low, which may be caused by the fact that the temperature of the battery pack is very low before heating due to the very low ambient temperature. At this time, the external heating mode can be started, so that the external heating mode and the internal heating mode exist at the same time, so as to quickly heat the battery pack.

[0156] In some embodiments, the judgment time is:

[0157] determined according to a preset time;

[0158] or, the time required for the battery pack to increase the preset temperature.

[0159] When the judgment time is determined according to the preset time, it can be understood that:

[0160] When the battery pack is heated by the internal heating mode for a preset time, that is, the judgment time is reached.

[0161] In addition, the preset time can be set according to actual needs, for example but not limited to 1 minute, 2 minutes or 5 minutes or other time lengths, which are not limited herein.

[0162] When the judgment time is the time required for the battery pack to increase the preset temperature, it can be understood that:

[0163] After the battery pack is heated by the internal heating mode, the temperature of the battery pack will gradually increase. If the moment when the heating starts is recorded as the first moment, the temperature of the battery pack at the first moment is recorded as T1, and the moment when the temperature of the battery pack increases to T1+ preset temperature is recorded as the second moment, then the judgment time is the time difference between the second moment and the first moment.

[0164] In some embodiments, the preset temperature is any value in 3℃ to 6℃.

[0165] For example, the preset temperature can be but is not limited to 5℃, and can also be 4℃, 6℃ or 3℃ or other temperatures, which can be set according to actual needs, and are not limited herein.

[0166] In some embodiments, the determination method of the temperature increased by the battery pack specifically includes:

[0167] When the temperature of the battery pack is collected based on the preset collection period, the temperature of the battery pack corresponding to each collection period is determined;

[0168] The difference between the temperature of the battery pack corresponding to each collection period and the reference temperature is calculated when the temperature of the battery pack before heating is taken as the reference temperature;

[0169] The temperature of the battery pack is determined according to the difference.

[0170] The collection period can be set according to actual needs, which is not limited herein.

[0171] In this way, the temperature of the battery pack can be determined, and whether the judgment time is reached can be determined, so that whether the external heating mode is started can be further determined.

[0172] In some embodiments, the temperature of the battery pack corresponding to each collection period is determined, specifically including:

[0173] When the battery pack includes one temperature detector, the temperature of the battery pack corresponding to each collection period is determined according to the temperature detected by the temperature detector;

[0174] Or, when the battery pack includes multiple (i.e., two or more) temperature detectors, the temperature of the battery pack corresponding to each collection period is determined according to the temperature detected by each temperature detector.

[0175] For example, the battery module includes multiple batteries and busbars for electrically connecting the batteries, and the temperature detector can be located on the busbar or on the cover plate of the battery. Of course, the temperature detector can also be located at other positions in the battery module, which is not limited herein as long as the temperature of the battery module can be detected.

[0176] In this way, when there is only one temperature detector, the temperature of the battery pack corresponding to each collection period can be determined by the temperature detected by the temperature detector. When there are multiple temperature detectors, the temperatures detected by different temperature detectors at the same time can be different. At this time, the temperature of the battery pack corresponding to each collection period can be determined according to the detected temperatures, so as to improve the accuracy of the determined temperature.

[0177] In some embodiments, the temperature of the battery pack corresponding to each collection period is determined according to the temperature detected by each temperature detector, specifically including:

[0178] The temperature of the battery pack corresponding to each collection period is determined according to the average of the temperatures detected by each temperature detector;

[0179] Or, the temperature of the battery pack corresponding to each collection period is determined according to the minimum value of the temperatures detected by each temperature detector.

[0180] In this way, when determining the battery pack temperature for each acquisition cycle based on the average value of the detected temperatures, the determined temperature can be closer to the actual temperature of the battery pack, thereby improving the accuracy of the determination of the timing.

[0181] In practice, due to the influence of battery position, when heating is done only by internal heating, the batteries near the edge of the battery pack are more affected by the ambient temperature, and the heat loss rate of the batteries near the edge is greater than that of the batteries near the center, which makes the heating rate of the batteries near the edge slower.

[0182] When determining the battery pack temperature for each acquisition cycle based on the minimum of the detected temperatures, the influence of the battery placement location can be taken into account, so that the batteries at each location in the battery pack can be effectively heated.

[0183] In some embodiments, it also includes:

[0184] When the temperature of the battery pack is collected based on a preset collection cycle, and the collected temperature of the battery pack is greater than or equal to a second preset value, the high-frequency internal heating device stops providing high-frequency AC signals to the battery, and the electromagnetic external heating device stops providing alternating magnetic fields to the battery pack.

[0185] In other words, regardless of whether internal heating or a combination of internal and external heating is used to heat the battery pack, the battery pack temperature will be collected at each sampling cycle after heating to monitor the temperature change during the heating process. When the battery pack temperature rises to the second preset value, it indicates that the battery pack temperature has moved out of the low-temperature state. At this point, the battery pack has better performance, so heating can be stopped to avoid further reduction in the power consumption of the heating system.

[0186] Furthermore, when the temperature of the heated battery pack reaches the second preset value, it is difficult or impossible for cold air from outside the battery pack to enter the battery pack, and the batteries in the battery pack will not experience heat loss. Therefore, heating of the battery pack can be stopped at this point.

[0187] The heating method will be described below with reference to specific embodiments.

[0188] Combination ​ As shown, the example illustrates a method where internal heating is activated first, and external heating is activated only when preset conditions are met, while internal heating continues to be used.

[0189] S301. Obtain the ambient temperature of the battery pack and determine whether the ambient temperature is less than or equal to a first preset value; if yes, proceed to S302; if no, proceed to S307.

[0190] Note that when the battery pack is in the environment for a certain period of time, the temperature of the battery pack is generally close to the ambient temperature, so when the ambient temperature is determined to be low, it indicates that the temperature of the battery pack is also low.

[0191] Specifically, for the manner of obtaining the ambient temperature, any manner known to those skilled in the art can be used to obtain the temperature, which is not limited herein.

[0192] S302, the battery management system controls the high-frequency internal heating device to provide a high-frequency alternating current signal to the battery, so as to heat the battery pack in an internal heating manner;

[0193] S303, it is determined whether the judgment time is reached; if yes, S304 is executed; if no, S302 is returned;

[0194] S304, it is determined whether the current state of the battery pack meets the preset condition; if yes, S305 is executed; if no, S306 is executed;

[0195] The following is an example.

[0196] Taking 1s as the collection period.

[0197] When the first 1s arrives, the temperature of the corresponding battery pack is determined to be a1, and the difference between a1 and the reference temperature (denoted by a0) is calculated, which is taken as the temperature of the battery pack raised in the first 1s; if the preset temperature is denoted by A, if a1-a0

[0198] When the second 1s arrives, the temperature of the corresponding battery pack is determined to be a2, and the difference between a2 and the reference temperature a0 is calculated, which is taken as the temperature of the battery pack raised in the second 1s; if a2-a0

[0199] When the third 1s arrives, the temperature of the corresponding battery pack is determined to be a3, and the difference between a3 and the reference temperature a0 is calculated, which is taken as the temperature of the battery pack raised in the third 1s; if a3-a0>A, it indicates that the judgment time is reached; at this time, if the temperature of the battery pack is collected, the result obtained may still be a3, so it can be determined whether a3 is less than or equal to the first preset value; if yes, it indicates that the preset condition is met; if no, it indicates that the preset condition is not met.

[0200] S305, the battery management system controls the high-frequency internal heating device to continue to provide a high-frequency alternating current signal to the battery, and controls the electromagnetic external heating device to provide an alternating magnetic field to the battery pack, so as to continue to heat the battery pack in a combination of internal heating and external heating; S309 is continued to be executed.

[0201] S306. The battery management system controls the high-frequency internal heating device to continue providing a high-frequency AC signal to the battery, and continues to heat the battery pack by internal heating; continue to execute S309.

[0202] S307. Determine if the ambient temperature is lower than the second preset value; if yes, proceed to S308; if no, end the process.

[0203] S308 The battery management system controls the high-frequency internal heating device to provide a high-frequency AC signal to the battery to heat the battery pack through internal heating.

[0204] S309. When it is determined that the current temperature of the battery pack is not less than the second preset value, the battery management system controls the high-frequency internal heating device to stop providing high-frequency AC signals to the battery and controls the electromagnetic external heating device to stop providing alternating magnetic fields to the battery pack, so as to stop heating the battery pack.

[0205] Based on the same inventive concept, embodiments of the present invention provide an electrical device, such as... ​ As shown, it may include: the battery device 101 as described in the embodiments of the present invention.

[0206] Thus, when the heating system includes an electromagnetic external heating device and a high-frequency internal heating device, the electromagnetic external heating device is based on the principle of electromagnetic heating, which can be understood as an external heating method. The high-frequency internal heating device is based on the principle of high-frequency AC internal heating, which can be understood as an internal heating method. Therefore, by combining the external heating method and the internal heating method, the heating efficiency can be improved, enabling rapid heating of the battery pack. This improves the performance of the battery pack and enhances the battery life of the electrical equipment.

[0207] In some embodiments, such as ​ As shown, it also includes: a fuel heating unit 102 and a crew compartment 103;

[0208] The fuel heating device 102 is used to heat the crew compartment 103.

[0209] In this way, the passenger compartment can be heated by the fuel heating system, avoiding the use of battery power to heat the passenger compartment, thus saving battery energy and avoiding affecting the range of electrical equipment, while also ensuring that the passenger compartment has a suitable temperature.

[0210] In some embodiments, the working principle of the fuel heating device may include:

[0211] like ​As shown, the electric device includes an oil tank 104, and the fuel heating device includes a fuel heater 1021 and a radiator 1022, and a cooling liquid circulates between the fuel heater 1021 and the radiator 1022 (a liquid flow pipe 1023 is shown between the fuel heater 1021 and the radiator 1022, and the cooling liquid can flow in the liquid flow pipe 1023, but the cooling liquid is not marked in the figure, and the flow direction of the cooling liquid is represented by a dashed arrow), and the radiator 1022 is connected to the passenger cabin 103, and the oil tank 104 is connected to the fuel heater 1021.

[0212] The oil in the oil tank 104 enters the fuel heater 1021 to be burned to generate heat, and the generated heat can heat the cooling liquid, so that the cooling liquid is heated, and the heated cooling liquid enters the radiator 1022 through circulation, exchanges the heat in the cooling liquid through heat exchange, and transmits the heat to the passenger cabin 103, so as to realize that the fuel heating device heats the passenger cabin 103.

[0213] In some embodiments, the fuel heating device is also used for:

[0214] When the temperature of the passenger cabin reaches the third preset value, stop heating the passenger cabin.

[0215] In this way, it can be ensured that the passenger cabin is always at a suitable temperature in a low-temperature environment, and a better experience is provided for the passengers.

[0216] In some embodiments, the electric device can be but is not limited to an electric vehicle.

[0217] In some embodiments, in addition to the above structure, the electric device can also include other structures that can realize the function of the electric device, which is not limited here.

[0218] Obviously, those skilled in the art can make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application belong to the scope of the claims of the present application and their equivalent technologies, the present application also intends to include these modifications and variations.

Claims

1. A heating method for a battery device, characterized in that, The battery device includes a battery pack and a heating system. The battery pack includes at least two batteries. The heating system includes an electromagnetic external heating device and a high-frequency internal heating device, and the heating system is located outside the battery pack. The terminals of the batteries are electrically connected to the high-frequency internal heating device. The high-frequency internal heating device is used to: provide a high-frequency AC signal to the batteries and heat them by utilizing the internal resistance of the batteries. The electromagnetic external heating device is used to: provide an alternating magnetic field to the battery pack and heat the battery pack. The heating method includes: the high-frequency internal heating device providing a high-frequency AC signal to the battery, and / or the electromagnetic external heating device providing an alternating magnetic field to the battery pack to heat the battery pack; The high-frequency internal heating device provides a high-frequency AC signal to the battery, and / or the electromagnetic external heating device provides an alternating magnetic field to the battery pack, specifically including: When the ambient temperature of the battery pack is less than or equal to a first preset value, the high-frequency internal heating device first provides the high-frequency AC signal to the battery; When the preset judgment time is reached and it is determined that the current state of the battery pack meets the preset conditions, the high-frequency internal heating device continues to provide the high-frequency AC signal to the battery, and the electromagnetic external heating device provides the alternating magnetic field to the battery pack; when the preset judgment time is reached and it is determined that the current state of the battery pack does not meet the preset conditions, the high-frequency internal heating device continues to provide the high-frequency AC signal to the battery.

2. The heating method as described in claim 1, characterized in that, The high-frequency internal heating device includes: a high-frequency control module and a signal output module that are electrically connected; The high-frequency control module is used to: output control signals to the signal output module; The electrode post is electrically connected to the signal output module, which is used to provide the high-frequency AC signal to the battery when the control signal is received.

3. The heating method as described in claim 1 or 2, characterized in that, The electromagnetic external heating device includes: a power supply module and an electromagnetic module that are electrically connected; The power module is used to: output an alternating signal to the electromagnetic module; The electromagnetic module is used to: provide the alternating magnetic field to the battery pack based on the alternating signal.

4. The heating method as described in claim 3, characterized in that, The battery device further includes: a battery management system; The high-frequency internal heating device includes a high-frequency control module, and both the high-frequency control module and the power module are electrically connected to the battery management system. The battery management system is used for: The high-frequency control module is controlled to output a control signal, and the power supply module is controlled to output the alternating signal.

5. The heating method as described in claim 3, characterized in that, The frequency of the alternating signal is from 33 kHz to 38 kHz, and the value of the alternating signal is from 5 A to 9 A.

6. The heating method as described in claim 1, characterized in that, The frequency of the high-frequency AC signal is 65Hz to 75Hz, and the value of the high-frequency AC signal is 20A to 30A.

7. The heating method as described in claim 1, characterized in that, The preset conditions include: When the temperature of the battery pack is collected at the determined time, the collected temperature of the battery pack is less than or equal to the first preset value.

8. The heating method as described in claim 1, characterized in that, The determination time is: Determined according to the preset time; Alternatively, the time required for the battery pack to rise to a preset temperature.

9. The heating method as described in claim 8, characterized in that, The preset temperature is any value between 3°C and 6°C.

10. The heating method as described in claim 8, characterized in that, The method for determining the temperature rise of the battery pack specifically includes: When collecting the temperature of the battery pack based on a preset collection cycle, the temperature of the battery pack corresponding to each collection cycle is determined; When the temperature of the battery pack before heating is recorded as the reference temperature, the difference between the temperature of the battery pack and the reference temperature is calculated for each acquisition cycle. The temperature rise of the battery pack is determined based on the difference.

11. The heating method as described in claim 10, characterized in that, Determining the temperature of the battery pack corresponding to each acquisition cycle specifically includes: When the battery pack includes a temperature detector, the temperature of the battery pack corresponding to each acquisition cycle is determined based on the temperature detected by the temperature detector. Alternatively, when the battery pack includes multiple temperature detectors, the temperature of the battery pack corresponding to each acquisition cycle is determined based on the temperature detected by each of the temperature detectors.

12. The heating method as described in claim 11, characterized in that, Based on the temperatures detected by each of the temperature detectors, the temperature of the battery pack corresponding to each acquisition cycle is determined, specifically including: The temperature of the battery pack corresponding to each acquisition cycle is determined based on the average temperature detected by each of the temperature detectors. Alternatively, the temperature of the battery pack corresponding to each acquisition cycle can be determined based on the minimum temperature detected by each of the temperature detectors.

13. The heating method according to any one of claims 1-12, characterized in that, The heating method further includes: When the temperature of the battery pack is collected based on a preset collection period, and the collected temperature of the battery pack is greater than or equal to a second preset value, the high-frequency internal heating device stops providing the high-frequency AC signal to the battery, and the electromagnetic external heating device stops providing the alternating magnetic field to the battery pack.

14. An electrical appliance, characterized in that, include: A battery device heated using the heating method described in any one of claims 1-13.

15. The electrical equipment as described in claim 14, characterized in that, Also includes: Fuel heating system and crew compartment; The fuel heating device is used to heat the crew compartment.

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