Control method and device of low-temperature lithium battery module and electronic equipment

Abstract

The invention relates to the technical field of low-temperature lithium battery control, and provides a control method and device of a low-temperature lithium battery module and electronic equipment. The low-temperature lithium battery module comprises a main battery, a heating battery, a heat preservation assembly and a first heating assembly, the size of the main battery is larger than that of the heating battery, the heating battery is sleeved with the heat preservation assembly, the main battery is sleeved with the first heating assembly, the heating battery is electrically connected with the first heating assembly, and the heating battery is used for supplying power to the first heating assembly; the control method of the low-temperature lithium battery module comprises the following steps: when a main battery is in a charge-discharge state, acquiring the environment temperature of the main battery; and if the environment temperature of the main battery is lower than the preset value, the heating battery is controlled to supply power to the first heating assembly, so that the first heating assembly heats the main battery. According to the control method of the low-temperature lithium battery module, the working environment temperature of the main battery is ensured, the performance of the main battery is prevented from being influenced by the temperature, and meanwhile, the intelligent degree is improved.

Description

Technical Field

[0001] The present application relates to the technical field of low-temperature lithium battery control, and particularly to a control method, device and electronic device for a low-temperature lithium battery module. Background Art

[0002] Lithium batteries are prone to problems such as capacity decline, inability to start, and inability to discharge in a low-temperature environment. In order to ensure the normal operation of lithium batteries, it is necessary to keep the temperature of lithium batteries within a suitable range.

[0003] In the related art, mainly heat preservation components are added to lithium batteries to maintain the temperature of lithium batteries, and the effect and intelligence level still need to be improved. Summary of the Invention

[0004] The present application aims to solve at least one of the technical problems existing in the related art. For this purpose, the present application provides a control method, device and electronic device for a low-temperature lithium battery module.

[0005] According to the control method of a low-temperature lithium battery module according to the first aspect embodiment of the present application, the low-temperature lithium battery module includes a main battery, a heating battery, a heat preservation component and a first heating component. The volume of the main battery is larger than that of the heating battery. The heat preservation component is sleeved on the heating battery, and the first heating component is sleeved on the main battery. The heating battery is electrically connected to the first heating component, and the heating battery is used to supply power to the first heating component. The control method of the low-temperature lithium battery module includes:

[0006] When the main battery is in a charge and discharge state, obtain the ambient temperature at the main battery.

[0007] If the ambient temperature at the main battery is lower than a preset value, control the heating battery to supply power to the first heating component, so that the first heating component heats the main battery.

[0008] According to an embodiment of the present application, the low-temperature lithium battery module further includes a second heating component. The second heating component is sleeved on the side wall of the heating battery, and the second heating component is located between the heat preservation component and the heating battery. Before the step of controlling the heating battery to supply power to the first heating component, it further includes:

[0009] Control the main battery to supply power to the second heating component, so that the second heating component heats the heating battery.

[0010] According to an embodiment of the present application, the low-temperature lithium battery module further includes a temperature detection component. The temperature detection component is arranged between the top of the heating battery and the heat preservation component. After the step of controlling the main battery to supply power to the second heating component, it includes:

[0011] Determine the temperature at the heating battery based on the detection data of the temperature detection component.

[0012] When the temperature at the heating battery reaches a preset temperature range, control the main battery to stop supplying power to the second heating component.

[0013] According to an embodiment of the present application, the main battery is electrically connected to the heating battery through a DC / DC conversion module; after the step of controlling the heating battery to supply power to the first heating component, the following steps are further included:

[0014] When the power of the heating battery is lower than a threshold value, control the main battery to output a voltage to the DC / DC conversion module.

[0015] Control the DC / DC conversion module to convert the output voltage of the main battery and supply power to the heating battery.

[0016] The low-temperature lithium battery module according to the second aspect embodiment of the present application includes a main battery, a heating battery, a heat preservation component, and a first heating component. The volume of the main battery is larger than that of the heating battery. The heat preservation component is sleeved on the heating battery, and the first heating component is sleeved on the main battery. The heating battery is electrically connected to the first heating component, and the heating battery is used to supply power to the first heating component.

[0017] According to an embodiment of the present application, an installation groove is formed on the outer wall surface of the main battery, the heating battery is embedded in the installation groove, and the heat preservation component abuts against the outer wall surface of the main battery.

[0018] The low-temperature lithium battery module control device according to the third aspect embodiment of the present application includes:

[0019] An acquisition module, configured to acquire the ambient temperature at the main battery when the main battery is in a charge and discharge state.

[0020] A control module, configured to control the heating battery to supply power to the first heating component if the ambient temperature at the main battery is lower than a preset value, so that the first heating component heats the main battery.

[0021] The electronic device according to the fourth aspect embodiment of the present application includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the control method of the above-mentioned low-temperature lithium battery module is implemented.

[0022] A non-transitory computer-readable storage medium according to an embodiment of the fifth aspect of the present application, the non-transitory computer-readable storage medium includes a computer program, and when the computer program is executed by a processor, it implements the control method of the low-temperature lithium battery module described above.

[0023] A computer program product according to an embodiment of the sixth aspect of the present application, the computer program product includes a computer program, and when the computer program is executed by a processor, it implements the control method of the low-temperature lithium battery module described above.

[0024] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0026] Figure 1 is a schematic flowchart of the control method of the low-temperature lithium battery module of the present invention;

[0027] Figure 2 is a schematic structural diagram of the low-temperature lithium battery module provided by the present invention;

[0028] Figure 3 is a schematic structural diagram of the heating battery provided by the present invention;

[0029] Figure 4 is a schematic structural diagram of the control device of the low-temperature lithium battery module provided by the present invention;

[0030] Figure 5 is a schematic structural diagram of the electronic device provided by the present invention;

[0031] Figure 6 is a schematic structural diagram of the main battery provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] To make the objectives, technical solutions, and advantages of the present application clearer, the following will clearly and completely describe the technical solutions in the present application with reference to the accompanying drawings in the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

[0033] An embodiment of the control method for a low-temperature lithium battery module is provided in an embodiment of the present application. It should be noted that although the logical order is shown in the flowchart, under certain data, the steps shown or described can be completed in a different order than here.

[0034] Before introducing the control method for the low-temperature lithium battery module in the embodiment of the present application, first, the application scenario of the control method for the low-temperature lithium battery module is explained. The control method for the low-temperature lithium battery module of the present application can be applied to intelligent terminals such as smart phones, tablets, and computers, and can also be applied to servers. The present application does not make special limitations here, as long as it can carry and implement the control method for the low-temperature lithium battery module of the present application.

[0035] The following takes the application of the control method for the low-temperature lithium battery module to the server side as an example for explanation, but it should be understood that the control method for the low-temperature lithium battery module is not limited to being applied only to the server side.

[0036] The following combines Figures 1 to 6 to describe the control method, device, and electronic device for the low-temperature lithium battery module of the present application.

[0037] According to an embodiment of the first aspect of the present application, as Figure 1 、 Figure 2 and Figure 3 shown, for the control method of the low-temperature lithium battery module, the low-temperature lithium battery module includes a main battery 1, a heating battery 2, a heat preservation component 3, and a first heating component 4. The volume of the main battery 1 is larger than the volume of the heating battery 2. The heat preservation component 3 is sleeved on the heating battery 2. The first heating component 4 is sleeved on the main battery 1. The heating battery 2 is electrically connected to the first heating component 4, and the heating battery 2 is used to supply power to the first heating component 4. The control method for the low-temperature lithium battery module includes:

[0038] Step 101: When the main battery 1 is in a charging or discharging state, obtain the ambient temperature at the main battery 1.

[0039] Step 102: If the ambient temperature at the main battery 1 is lower than a preset value, control the heating battery 2 to supply power to the first heating component 4, so that the first heating component heats the main battery 1.

[0040] According to the control method of the low-temperature lithium battery module of the present application, when it is determined that the main battery 1 is in a charging or discharging state, first obtain the ambient temperature at the main battery 1, compare the obtained ambient temperature with a preset value to determine whether the ambient temperature at the main battery 1 is lower than the preset value. When it is determined that it is lower than the preset value, it means that the ambient temperature at the main battery 1 is too low at this time, which will affect the performance of the battery. Therefore, control the heating battery 2 to supply power to the first heating component 4, so that the first heating component 4 starts to work, realizing the heating of the main battery 1, ensuring the working ambient temperature of the main battery 1, avoiding the performance of the main battery 1 from being affected by the temperature, and at the same time improving the degree of intelligence.

[0041] Moreover, only the heating battery 2 with a smaller volume needs to be provided with a heat preservation component 3, and there is no need to provide a heat preservation structure for the main battery 1 with a larger volume, reducing the space occupied by the heat preservation components.

[0042] It can be understood that the heat preservation component 3 can effectively play a heat preservation role for the heating battery 2, so that the working ambient temperature of the heating battery 2 can be maintained in a suitable temperature range, ensuring the performance of the heating battery 2.

[0043] It can be understood that if the main battery 1 is directly used to supply power to the first heating component 4, since the power consumption of the first heating component 4 is large, and the performance of the main battery 1 is poor in a low-temperature environment, it is easy to damage the life of the main battery 1. If a heat preservation structure is provided for the main battery 1, it will cause the problem of excessive space occupation. Therefore, the heating battery 2 is used to heat the first heating component 4 to ensure that the working ambient temperature of the main battery 1 meets the standard.

[0044] In some examples, the heat preservation component 3 is, for example, aerogel thermal insulation material, vacuum insulation panel or phase change material.

[0045] In some embodiments, the low-temperature lithium battery module further includes a second heating component 5, the second heating component 5 is sleeved on the side wall of the heating battery 2, and the second heating component 5 is located between the heat preservation component 3 and the heating battery 2; before the step of controlling the heating battery 2 to supply power to the first heating component 4, it further includes:

[0046] Control the main battery 1 to supply power to the second heating component 5, so that the second heating component 5 heats the heating battery 2.

[0047] It can be understood that before controlling the heating battery 2 to supply power to the first heating component 4, first control the main battery 1 to supply power to the second heating component 5, so that the second heating component 5 can heat the heating battery 2, and then the working ambient temperature of the heating battery 2 can be increased, ensuring the performance of the heating battery 2.

[0048] Ensure that the heating battery 2 works in the best state through the preheating process, which not only protects the life of the heating battery 2 but also ensures the heating effect of the main battery 1. The output power of the main battery 1 is limited at low temperatures, and only a small power is required to complete the preheating. The high-power heating task is still borne by the dedicated heating battery 2. The heat preservation component 3 forms a heat insulation barrier during the preheating stage, enabling the heat generated by the second heating component 5 to act on the heating battery 2 intensively, significantly improving the preheating efficiency and reducing energy consumption.

[0049] It can be understood that the second heating component 5 is arranged between the side wall of the heating battery 2 and the heat preservation component 3. This sandwich design can not only ensure the heating efficiency but also reduce heat dissipation through the heat preservation component 3.

[0050] In some examples, the first heating component 4 and the second heating component 5 are, for example, metal thin film heating sheets or carbon fiber heating layers.

[0051] In some examples, when it is detected that the ambient temperature of the main battery 1 is lower than the preset value, the main battery 1 is first activated to supply power to the second heating component 5. At this time, the remaining power of the main battery 1 is used to preheat the heating battery 2, so that the temperature of the heating battery 2 rises to the optimal working range (usually above 0 °C). After the temperature of the heating battery 2 reaches the standard, the power supply is switched to the heating battery 2 to supply power to the first heating component 4. At this time, the heating battery 2 is in the best working state and can efficiently output electric energy, avoiding the damage caused by the direct large-current discharge of the cold heating battery 2.

[0052] In an embodiment of the present application, the low-temperature lithium battery module further includes a temperature detection component, and the temperature detection component is arranged between the top of the heating battery 2 and the heat preservation component 3; after the step of controlling the main battery 1 to supply power to the second heating component 5, it includes:

[0053] Based on the detection data of the temperature detection component, determine the temperature at the heating battery 2;

[0054] When the temperature at the heating battery 2 reaches the preset temperature range, control the main battery 1 to stop supplying power to the second heating component 5.

[0055] It can be understood that the low-temperature lithium battery module of the present application further includes a temperature detection component, which is arranged on the top of the heating battery 2 and is located between the heating battery 2 and the heat preservation component 3. After controlling the main battery 1 to supply power to the second heating component 5, the following steps are performed:

[0056] 1. Temperature detection and feedback

[0057] The temperature detection component (such as an NTC thermistor, a thermocouple or a digital temperature sensor) monitors the temperature of the heating battery 2 in real time and feeds back the detection data to the control system (such as a BMS battery management system).

[0058] Since the temperature detection component is located at the top of the heating battery 2 (an area where heat is likely to accumulate) and is wrapped by the heat insulation component 3, its detected value can accurately reflect the actual operating temperature of the heating battery 2 and avoid interference from the ambient temperature.

[0059] 2. Temperature Judgment and Control Logic

[0060] The control system compares the detected temperature with a preset temperature range (such as 5°C to 15°C):

[0061] If the temperature is lower than the lower limit (such as <5°C): Continue to maintain the power supply of the main battery 1 to the second heating component 5 to keep the heating battery 2 heating up continuously.

[0062] If the temperature reaches the preset range (such as 5°C to 15°C): Control the main battery 1 to stop power supply and the second heating component 5 to stop working.

[0063] This preset temperature range needs to meet:

[0064] Lower limit (such as 5°C): Ensure that the heating battery 2 gets out of the low-temperature state and avoid damage to its life due to low-temperature discharge.

[0065] Upper limit (such as 15°C): Avoid energy waste caused by overheating, and at the same time rely on the heat insulation component 3 to maintain temperature stability.

[0066] 3. Heat Insulation and Self-Sustaining Mechanism

[0067] After power supply is stopped, the heat insulation component 3 effectively reduces heat dissipation and keeps the temperature of the heating battery 2 stable.

[0068] When the heating battery 2 powers the first heating component 4 later, the heat generated by its own internal resistance can supplement part of the heat to further maintain the temperature.

[0069] It can be understood that the power required by the second heating component 5 accounts for a very low proportion of the main battery 1 and will not affect the performance of the main battery 1.

[0070] After heating the temperature of the heating battery 2 to a certain degree, then heat the first heating component 4 to avoid over-discharge of the heating battery 2 in a low-temperature environment and affecting its life. After the temperature of the heating battery 2 reaches the preset temperature, stop power supply to the second heating component 5. Because of the heat insulation component 3 and the heat generated by the heating battery 2 itself, the temperature can be kept stable.

[0071] In an embodiment of the present application, the main battery 1 is electrically connected to the heating battery 2 through a DC / DC conversion module; after the step of controlling the heating battery 2 to supply power to the first heating component 4, it further includes:

[0072] When the power of the heating battery 2 is lower than the threshold, control the main battery 1 to output voltage to the DC / DC conversion module;

[0073] Control the DC / DC conversion module to convert the output voltage of the main battery 1 and supply power to the heating battery 2.

[0074] It can be understood that in the low-temperature lithium battery module of the present application, the main battery 1 is electrically connected to the heating battery 2 through a DC / DC conversion module. After controlling the heating battery 2 to supply power to the first heating component 4, the battery management system (BMS) monitors the power (SOC) of the heating battery 2 in real time and compares it with a preset power threshold (such as 10% - 20%).

[0075] When the power of the heating battery 2 is lower than the threshold, it indicates that its energy storage is insufficient and the main battery 1 needs to replenish the power to ensure continuous power supply to the first heating component 4. The control system starts the output of the main battery 1 and delivers electrical energy to the DC / DC conversion module. The voltage of the main battery 1 (such as 48V) is usually higher than that of the heating battery 2 (such as 12V), so the DC / DC conversion module performs a step-down process to match the charging requirements of the heating battery 2. The DC / DC conversion module converts the high-voltage direct current of the main battery 1 into a low-voltage constant current / constant voltage charging mode suitable for the heating battery 2 to avoid overcharging or voltage shock.

[0076] During the charging process, the temperature detection component continuously monitors the temperature of the heating battery 2 to ensure that it is charged within a safe range (such as 0°C - 30°C) to prevent lithium deposition during low-temperature charging or thermal runaway at high temperatures.

[0077] It can be understood that in this embodiment, the heating battery 2 is preferentially used for power supply: reducing the number of times the main battery 1 directly drives a high-power load (the first heating component 4) and protecting its life. In the on-demand power replenishment strategy of this embodiment: only when the power of the heating battery 2 is insufficient, the main battery 1 intervenes through an efficient DC / DC conversion module to reduce the overall energy consumption. That is to say, the main battery 1 only undertakes a small-power power replenishment task (through the DC / DC conversion module) to avoid direct large-current discharge damage. The heating battery 2 works in a suitable temperature range, improving the discharge efficiency and extending the cycle life.

[0078] It can be understood that if the main battery 1 is used to supply power to the first heating component 4 at the beginning, since the power consumption of the first heating component 4 is large, it is easy to damage the life of the main battery 1. Therefore, a small amount of power is first used to make the heating battery 2 in a normal temperature range, and then the heating battery 2 is used to supply power to the first heating component 4, ensuring the life of both batteries.

[0079] If a thermal insulation structure is provided for the main battery 1, it will cause the problem of excessive space occupation. Therefore, the heating battery 2 is used to continuously heat the first heating component 4 to ensure that the working environment temperature of the main battery 1 meets the standard. At the same time, the thermal insulation structure of the main battery 1 is omitted, and the compact thermal insulation component 3 relying on the heating battery 2 saves space.

[0080] According to an embodiment of the present application, as Figure 6 shown, the main battery includes a battery module, the battery module includes a first battery pack, a second battery pack and a third switch, the third switch is electrically connected between the first battery pack and the second battery pack, and the main battery has a first charging port and a second charging port; the control method of the low-temperature lithium battery module includes:

[0081] Determine that both the first charging port and the second charging port are connected to a charging power source;

[0082] Control the third switch to disconnect the connection between the first battery pack and the second battery pack;

[0083] Control the first charging port to be electrically connected to the first battery pack to charge the first battery pack;

[0084] Control the second charging port to be electrically connected to the second battery pack to charge the second battery pack.

[0085] According to the control method of the low-temperature lithium battery module of the present application, the battery module is provided with a first charging port and a second charging port, and both the first charging port and the second charging port can be connected to a charging power source. When it is determined that both the first charging port and the second charging port are connected to a charging power source, the third switch is controlled to disconnect the first battery pack and the second battery pack, so that the first battery pack and the second battery pack are independent of each other. Then, the first charging port is controlled to be electrically connected to the first battery pack to charge the first battery pack with the charging power source at the first charging port, and the second charging port is controlled to be electrically connected to the second battery pack to charge the second battery pack with the charging power source at the second charging port, thereby realizing charging the main battery with dual power sources, improving the charging speed of the main battery, shortening the replenishment time of the main battery, and meeting the user's need for quick replenishment.

[0086] It can be understood that in the related art, the battery module has only one charging port, and thus can only be charged using one charging power source. In the present application, the battery module has two charging ports. When only one charging port is connected to a charging power source, the third switch connects the first battery pack and the second battery pack, enabling the charging power source to directly charge the entire main battery. When both the first charging port and the second charging port are connected to charging power sources, the third switch disconnects the first battery pack and the second battery pack, making the first battery pack and the second battery pack independent of each other. Thus, one of the charging power sources can be used to charge the first battery pack, and the other charging power source can be used to charge the second battery pack, achieving dual-power charging and improving the charging speed.

[0087] In some examples, the third switch is a controllable relay or a MOSFET switch, controlled by a control module, and is used to conduct or disconnect the electrical connection between the first battery pack and the second battery pack.

[0088] In some examples, when implementing the control method for the low-temperature lithium battery module,

[0089] First, the states of the dual charging ports are detected. The control module continuously monitors the connection states of the first charging port and the second charging port. When it is detected that both charging ports are connected to valid charging power sources (for example, the first port is connected to a solar input voltage ≥ 18V, and the second port is connected to a mains adapter voltage of 220V), the dual-port charging mode is triggered.

[0090] Then, battery pack isolation control is performed. The control module sends a disconnection instruction to the third switch to completely disconnect the electrical connection between the first battery pack and the second battery pack, forming two independent charging circuits. This is to avoid mutual charging or energy loss between the two battery packs due to voltage differences, and at the same time eliminate the risk of mutual interference between the power sources during parallel charging.

[0091] Then, dynamic allocation of the charging circuits is performed. The first charging port is connected to the first battery pack: The control module closes the access switch (such as MOS transistor Q1) of the first charging port, directly connecting the input power source (such as solar energy) of the first charging port to the positive and negative electrodes of the first battery pack, and charging the first battery pack through a charging management circuit (such as an MPPT controller). The second charging port is connected to the second battery pack: Synchronously close the access switch (such as MOS transistor Q2) of the second charging port, connecting the input power source (such as a mains adapter) of the second charging port to the positive and negative electrodes of the second battery pack, and charging the second battery pack through a constant voltage / constant current (CV / CC) mode.

[0092] Furthermore, the present application specifically has at least the following technical effects:

[0093] Dual-port power superposition: By disconnecting the third switch, the battery pack is divided into independent units, enabling the two charging ports to supply power to different battery packs simultaneously. The total input power is the sum of the powers at both ports (e.g., solar input 300W + mains input 500W = total input 800W), breaking through the single-port power limit and significantly shortening the charging time.

[0094] Power compatibility guarantee: When the two charging ports are connected to power sources with different characteristics (such as unstable solar energy and stable mains power), due to the isolation of the battery packs, voltage conflicts between the power sources are avoided, and each adapts to the battery requirements through an independent charging management circuit.

[0095] The present application will be described below in conjunction with actual scenarios:

[0096] Assume that the total capacity of the main battery is 2000Wh and the maximum input power of a single port is 500W. For traditional single-port charging, it takes 4 hours to fully charge. After adopting this method, if both ports input simultaneously (solar 300W + mains 500W), the total power is increased to 800W, and the charging time is shortened to about 2.5 hours, with the efficiency increased by about 37.5%.

[0097] In some embodiments, the main battery further includes a first switch and a first DC / DC. The first charging port, the first DC / DC, and the charging port of the first battery pack are electrically connected in sequence. The total charging port of the battery module is electrically connected to the first switch. The first switch can be switched between a first state and a second state. In the first state, the first switch connects the first charging port and the total charging port of the battery module. In the second state, the first switch connects the first charging port and the first DC / DC.

[0098] It can be understood that the first switch is a dual-way switching switch (such as a relay or a MOS transistor combination), controlled by a control module, and has two states: the first state (direct connection mode), directly connecting the first charging port and the total charging port of the battery module, and the input power directly charges the entire battery module; the second state (DC / DC mode): connecting the first charging port to the input end of the first DC / DC module, and the output end of the first DC / DC is connected to the independent charging port of the first battery pack. The first DC / DC module is a buck-boost DC / DC converter, used to adjust the input voltage to match the battery pack requirements (such as boosting the unstable low voltage of the solar panel to the battery pack charging voltage).

[0099] It can be understood that when only the first charging port is connected to a high-voltage power source such as an adapter, the DC / DC module is bypassed through the direct connection mode, reducing energy conversion losses (such as the DC / DC efficiency is about 95%, and the direct connection efficiency

[0100] ≈100%) to achieve fast charging. When the first charging port and the second charging port are simultaneously connected to a power source, the input of the first charging port is restricted to charge the first battery pack through the first switch, and the second charging port independently charges the second battery pack, realizing the superposition of the power of two power sources. The input power of both ports is independently distributed to different battery packs, and the total charging power is the sum of the powers of both ports (for example, solar 300W + mains 500W = 800W), and the charging time is shortened by about 37.5% compared to single-port charging.

[0101] In some examples, when the first charging port is connected to a low-voltage power source (such as solar energy), it is boosted through the DC / DC module to ensure the effective utilization of the input power.

[0102] In some examples, when a charging power source is connected to a single charging port (for example, only the first charging port is connected to a power source):

[0103] The control module detects that the second charging port is not connected to an effective power source, and the input of the first charging port is effective (such as voltage ≥ 5V).

[0104] The control module determines the type of the input power source:

[0105] If the input voltage matches the total charging port voltage of the battery module (such as the mains adapter output of 54.6V corresponding to a 48V battery pack), the first switch is controlled to switch to the first state (direct connection mode), and the input power source directly charges the entire battery module through the total charging port.

[0106] If the input voltage does not match (such as solar input of 18V), the first switch is controlled to switch to the second state (DC / DC mode), and the input power source is adjusted by the first DC / DC module to charge the first battery pack.

[0107] When charging power sources are connected to both the first charging port and the second charging port:

[0108] The control module detects that effective power sources are connected to both ports and triggers the dual-port charging mode.

[0109] The first switch switches to the second state (DC / DC mode): The first charging port charges the first battery pack through the first DC / DC module.

[0110] The second charging port is directly connected to the second battery pack: The second charging port directly or through the second DC / DC module charges the second battery pack.

[0111] Specifically, the step of controlling the first charging port to be electrically connected to the first battery pack to charge the first battery pack includes:

[0112] Control the first switch to disconnect the first charging port from the total charging port of the battery module, and control the first switch to connect the first charging port to the first DC / DC;

[0113] Control the first DC / DC to perform voltage conversion on the power supply at the first charging port to charge the first battery pack.

[0114] It can be understood that the first DC / DC can perform voltage conversion on the power supply at the first charging port to obtain a voltage matching the first battery pack to charge the first battery pack.

[0115] In an embodiment of the present application, the control method of the low-temperature lithium battery module further includes:

[0116] When the first charging port is connected to a charging power supply and the second charging port is not connected to a charging power supply,

[0117] Control the third switch to connect the first battery pack and the second battery pack;

[0118] Control the first switch to connect the first charging port to the total charging port of the battery module, and control the first switch to disconnect the first charging port from the first DC / DC.

[0119] It can be understood that the connection status of the first charging port and the second charging port is monitored in real time. When it is detected that the first charging port is connected to an effective power supply (such as voltage ≥ 5V) and the second charging port is not connected to a power supply, the single-port charging mode is triggered. A closing instruction is sent to the third switch (S3) to connect the first battery pack and the second battery pack together to form a unified battery module. The control module controls the first switch to switch to the first state (direct connection mode), that is: disconnect the connection between the first charging port and the first DC / DC module; directly connect the first charging port to the total charging port of the battery module.

[0120] That is to say, when only the first charging port is connected to a high-voltage power supply such as an adapter, the two battery packs are connected together by closing the third switch, and the first switch is used to directly connect to the total charging port. The input power supply directly charges the entire battery module. By bypassing the energy conversion loss of the DC / DC module (efficiency ≈ 100%), the charging speed is maximized, the equivalent capacity of the battery pack is increased, and a higher input current can be accepted (for example, the current limit of a single battery pack is 10A, and the current limit after parallel connection is 20A).

[0121] In one embodiment of the present application, the main battery further includes a second switch and a second DC / DC. The second charging port, the second DC / DC, and the charging port of the second battery pack are electrically connected in sequence. The total charging port of the battery module is electrically connected to the second switch. The second switch can be switched between a third state and a fourth state. In the third state, the second switch connects the second charging port and the total charging port of the battery module. In the fourth state, the second switch connects the second charging port and the second DC / DC.

[0122] It can be understood that the second switch is a two-way switching switch (such as a relay or a MOS transistor combination), controlled by a control module, and has two states: the third state (direct connection mode), directly connecting the second charging port and the total charging port of the battery module, and the input power supply directly charges the entire battery module; the fourth state (DC / DC mode): connecting the second charging port to the input end of the second DC / DC module, and the output end of the second DC / DC is connected to the independent charging port of the second battery pack. The second DC / DC module is a buck-boost DC / DC converter, which is used to adjust the input voltage to match the battery pack requirements (such as boosting the unstable low voltage of the solar panel to the battery pack charging voltage).

[0123] It can be understood that when only the second charging port is connected to a high-voltage power supply such as an adapter, the DC / DC module is bypassed through the direct connection mode, reducing energy conversion losses (such as the DC / DC efficiency is about 95%, and the direct connection efficiency

[0124] ≈100%), realizing fast charging. When the first charging port and the second charging port are connected to the power supply at the same time, the input of the second charging port is restricted to charge the second battery pack through the switching of the second switch, and the first charging port independently charges the first battery pack, realizing the power superposition of the two power supplies. The input power of the two ports is independently distributed to different battery packs, and the total charging power is the sum of the powers of the two ports (for example, solar 300W + mains 500W = 800W), and the charging time is shortened by about 37.5% compared with single-port charging.

[0125] In some examples, when the second charging port is connected to a low-voltage power supply (such as solar energy), it is boosted through the DC / DC module to ensure the effective utilization of the input power.

[0126] In some examples, when a charging power supply is connected to a single charging port (for example, only the second charging port is connected to the power supply):

[0127] The control module detects that the first charging port is not connected to an effective power supply, and the input of the second charging port is effective (such as voltage ≥ 5V).

[0128] The control module judges the type of the input power supply:

[0129] If the input voltage matches the total charging port voltage of the battery module (for example, the output of the mains adapter is 54.6V corresponding to a 48V battery pack), the second switch is controlled to switch to the third state (direct connection mode), and the input power directly charges the entire battery module through the total charging port.

[0130] If the input voltage does not match (such as a 18V solar input), the second switch is controlled to switch to the fourth state (DC / DC mode), and the input power is adjusted by the second DC / DC module and then charges the second battery pack.

[0131] When charging power sources are connected to both the first charging port and the second charging port:

[0132] The control module detects that valid power sources are connected to both ports and triggers the dual-port charging mode.

[0133] The second switch switches to the fourth state (DC / DC mode): The second charging port charges the second battery pack through the first DC / DC module.

[0134] The second charging port is directly connected to the second battery pack: The second charging port directly or through the second DC / DC module charges the second battery pack.

[0135] In an embodiment of the present application, the step of controlling the second charging port to be electrically connected to the second battery pack to charge the second battery pack includes:

[0136] Control the second switch to disconnect the second charging port and the total charging port of the battery module, and control the second switch to connect the second charging port and the second DC / DC;

[0137] Control the second DC / DC to perform voltage conversion on the power source at the second charging port to charge the second battery pack.

[0138] It can be understood that the second DC / DC can perform voltage conversion on the power source at the second charging port to obtain a voltage matching the second battery pack to charge the second battery pack.

[0139] In an embodiment of the present application, the control method of the low-temperature lithium battery module further includes:

[0140] When a charging power source is connected to the second charging port and no charging power source is connected to the first charging port,

[0141] Control the third switch to connect the second battery pack and the second battery pack;

[0142] Control the second switch to connect the second charging port and the total charging port of the battery module, and control the second switch to disconnect the second charging port and the second DC / DC.

[0143] According to an embodiment of the second aspect of the present application, the low-temperature lithium battery module control device and the control method of the low-temperature lithium battery module correspond to each other for reference. As Figure 4 shown, the low-temperature lithium battery module control device includes:

[0144] An acquisition module 201, configured to acquire the ambient temperature at the main battery 1 when the main battery 1 is in a charge and discharge state;

[0145] A control module 202, configured to, if the ambient temperature at the main battery 1 is lower than a preset value, control the heating battery 2 to supply power to the first heating component 4, so that the first heating component heats the main battery 1.

[0146] According to an embodiment of the third aspect of the present application, the low-temperature lithium battery module includes a main battery 1, a heating battery 2, a heat preservation component 3, and a first heating component 4. The volume of the main battery 1 is larger than the volume of the heating battery 2. The heat preservation component 3 is sleeved on the heating battery 2. The first heating component 4 is sleeved on the main battery 1. The heating battery 2 is electrically connected to the first heating component 4, and the heating battery 2 is used to supply power to the first heating component 4.

[0147] In an embodiment of the present application, an installation groove is formed on the outer wall surface of the main battery 1, the heating battery 2 is embedded in the installation groove, and the heat preservation component 3 abuts against the outer wall surface of the main battery 1.

[0148] It can be understood that embedding the heating battery 2 in the main battery 1 realizes the integration of the heating battery 2 and the main battery 1, improves the integration degree of the low-temperature lithium battery module, and is beneficial to saving space. At the same time, the heat preservation component 3 sleeved on the heating battery 2 abuts against the outer wall surface of the main battery 1, so that the heat preservation component 3 can also play a role in heat insulation and preservation for a local position of the main battery 1, realizing the reuse of the heat preservation component 3.

[0149] According to an embodiment of the fourth aspect of the present application, as Figure 5 shown, the electronic device may include: a processor 310, a communication interface 320, a memory 330, and a communication bus 340. Among them, the processor 310, the communication interface 320, and the memory 330 complete mutual communication through the communication bus 340. The processor 310 can call the logical instructions in the memory 330 to execute the control method of the low-temperature lithium battery module, and the method includes:

[0150] When the main battery 1 is in a charging or discharging state, obtain the ambient temperature at the main battery 1;

[0151] If the ambient temperature at the main battery 1 is lower than a preset value, control the heating battery 2 to supply power to the first heating component 4 so that the first heating component heats the main battery 1.

[0152] In addition, when the logical instructions in the above-mentioned memory 330 can be implemented in the form of software function units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of the present invention. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0153] On the other hand, the present application also provides a computer program product. The computer program product includes a computer program stored on a non-transitory computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer can execute the control method of the low-temperature lithium battery module provided by the above-mentioned various methods. The method includes:

[0154] When the main battery 1 is in a charging or discharging state, obtain the ambient temperature at the main battery 1;

[0155] If the ambient temperature at the main battery 1 is lower than a preset value, control the heating battery 2 to supply power to the first heating component 4 so that the first heating component heats the main battery 1.

[0156] According to the embodiments of the fifth aspect of the present application, the present application also includes a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it is configured to execute the control method of the low-temperature lithium battery module provided by the above-mentioned various methods. The method includes:

[0157] When the main battery 1 is in a charging or discharging state, obtain the ambient temperature at the main battery 1;

[0158] If the ambient temperature at the main battery 1 is lower than the preset value, control the heating battery 2 to supply power to the first heating component 4, so that the first heating component heats the main battery 1.

[0159] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. Those of ordinary skill in the art can understand and implement it without creative efforts.

[0160] Through the description of the above embodiments, those skilled in the art can clearly understand that each embodiment can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on such an understanding, the above technical solution, in essence, or the part that contributes to the prior art can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods of each embodiment or some parts of the embodiments.

[0161] Finally, it should be noted that the above embodiments are only used to illustrate the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that various combinations, modifications, or equivalent replacements of the technical solutions of the present application do not depart from the spirit and scope of the technical solutions of the present application, and should all be covered by the scope of the claims of the present application.

Claims

1. A control method for a low-temperature lithium battery module, characterized in that, The low-temperature lithium battery module includes a main battery, a heating battery, a heat preservation component, and a first heating component. The volume of the main battery is larger than that of the heating battery. The heat preservation component is sleeved on the heating battery, and the first heating component is sleeved on the main battery. The heating battery is electrically connected to the first heating component, and the heating battery is used to supply power to the first heating component; The control method of the low-temperature lithium battery module includes: When the main battery is in a charging or discharging state, obtain the ambient temperature at the main battery; If the ambient temperature at the main battery is lower than a preset value, control the heating battery to supply power to the first heating component so that the first heating component heats the main battery.

2. The control method of the low-temperature lithium battery module according to claim 1, wherein The low-temperature lithium battery module further includes a second heating component. The second heating component is sleeved on the side wall of the heating battery, and the second heating component is located between the heat preservation component and the heating battery; before the step of controlling the heating battery to supply power to the first heating component, it further includes: Control the main battery to supply power to the second heating component so that the second heating component heats the heating battery.

3. The control method of the low-temperature lithium battery module according to claim 2, wherein The low-temperature lithium battery module further includes a temperature detection component. The temperature detection component is arranged between the top of the heating battery and the heat preservation component; after the step of controlling the main battery to supply power to the second heating component, it includes: Based on the detection data of the temperature detection component, determine the temperature at the heating battery; When the temperature at the heating battery reaches a preset temperature range, control the main battery to stop supplying power to the second heating component.

4. The control method of the low-temperature lithium battery module according to claim 1, wherein The main battery is electrically connected to the heating battery through a DC / DC conversion module; after the step of controlling the heating battery to supply power to the first heating component, it further includes: When the power of the heating battery is lower than a threshold value, control the main battery to output a voltage to the DC / DC conversion module; Control the DC / DC conversion module to convert the output voltage of the main battery and supply power to the heating battery.

5. A low-temperature lithium battery module, characterized in that, It includes a main battery, a heating battery, a heat preservation component, and a first heating component. The volume of the main battery is larger than that of the heating battery. The heat preservation component is sleeved on the heating battery, and the first heating component is sleeved on the main battery. The heating battery is electrically connected to the first heating component, and the heating battery is used to supply power to the first heating component.

6. The low-temperature lithium battery module according to claim 5, wherein, An installation groove is formed on the outer wall surface of the main battery, the heating battery is embedded in the installation groove, and the heat preservation component abuts against the outer wall surface of the main battery.

7. A control device for a low-temperature lithium battery module, characterized in that, It includes: An acquisition module, which is used to obtain the ambient temperature at the main battery when the main battery is in a charging or discharging state; A control module, which is used to control the heating battery to supply power to the first heating component if the ambient temperature at the main battery is lower than a preset value, so that the first heating component heats the main battery.

8. An electronic device, the electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method of the low-temperature lithium battery module according to any one of claims 1 to 4.

9. A non-transitory computer-readable storage medium, the non-transitory computer-readable storage medium comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the control method of the low-temperature lithium battery module according to any one of claims 1 to 4.

Images