A temperature-controlled battery, a battery temperature control system, and a battery temperature control method

Abstract

The application discloses a temperature-controlled battery, a battery temperature control system and a battery temperature control method. The temperature-controlled battery comprises a battery cell, two semiconductor refrigerating sheets, two graphite sheets, a heat-conducting support, a cell protection plate and a heat insulation layer. The cell protection plate is arranged on one side of the battery cell. The two semiconductor refrigerating sheets are connected to the upper and lower surfaces of the battery cell via the two graphite sheets. Three detection point selection areas are arranged on the battery cell, which are located on the upper and lower surfaces of the battery cell and the side where the cell protection plate is arranged. The detection point selection areas are used for determining the detection points and the current temperature through NTC temperature sensors. The application can effectively avoid the problem that a single temperature sampling cannot comprehensively reflect the existing battery temperature state by arranging multiple sampling points on the battery cell, comprehensively determining the temperatures of the sampling points and then determining the working mode of the semiconductor refrigerating sheet, so that the temperature control of the battery can be more accurately realized.

Description

Technical Field

[0001] This application relates to the field of battery devices, and more specifically, to a temperature-controlled battery, a battery temperature control system, and a battery temperature control method. Background Technology

[0002] Lithium-ion batteries have achieved great success in the field of chemical energy storage due to their excellent energy density, cycle life, and power performance. However, with the movement of lithium battery devices and the diverse climates in different regions, changes in ambient temperature can significantly affect the electrical performance of lithium-ion batteries. Generally speaking, lithium batteries are not very sensitive to temperatures in the range of 0-40℃; however, once the temperature exceeds this range, lifespan and capacity will be reduced. Furthermore, the lower the temperature, the worse the electrochemical activity of the internal charging and discharging processes, and the greater the impact on the charging and discharging function of the lithium battery.

[0003] Currently, most lithium battery devices on the market use temperature control in extreme ambient temperatures by monitoring the temperature of the NTC on the lithium battery cell protection board, combined with the main control chip for temperature display and alarm, as well as passive heat dissipation by heat sinks, intelligent heat dissipation by fans, and active heating by resistive films.

[0004] In the above-mentioned battery temperature control methods, NTC detects the temperature of the cell protection board. This method is greatly affected by the heat generated by the power control device of the protection board and has high thermal resistance due to the distance and contact between the protection board and the battery body. As a result, the accuracy of temperature detection is limited. In addition, single-point NTC detection cannot fully reflect the temperature of the battery cell body, and there are problems of low battery temperature control efficiency and lag. Summary of the Invention

[0005] In view of this, this application provides a temperature-controlled battery, a battery temperature control system, and a battery temperature control method, which can effectively avoid the problem that a single temperature sampling cannot fully represent the existing battery temperature state, and provide more accurate and timely temperature monitoring. The switching of the working mode of the semiconductor cooling chip can more accurately achieve temperature control of the battery.

[0006] To achieve the above objectives, the following solution is proposed:

[0007] A temperature-controlled battery, comprising:

[0008] Battery cell, two semiconductor cooling chips, two graphite sheets, thermally conductive bracket, cell protection board, and heat insulation layer;

[0009] The cell protection board is disposed on one side of the battery cell;

[0010] The two semiconductor cooling chips are respectively connected to the upper and lower sides of the battery cell via the two graphite sheets;

[0011] The battery cell has three detection point selection areas, located on the top and bottom surfaces of the battery cell and the side where the cell protection board is located. The detection point selection areas are used to determine each detection point and to determine the current temperature by detecting each detection point through an NTC temperature sensor.

[0012] Optionally, the two semiconductor cooling chips are respectively connected to the upper and lower surfaces of the battery cell via the two graphite sheets, including:

[0013] The two semiconductor cooling chips are respectively disposed on the upper and lower surfaces of the battery cell, and are uniformly attached to the upper and lower surfaces of the battery cell via the two graphite sheets.

[0014] Optionally, the two semiconductor cooling chips are respectively connected to the upper and lower surfaces of the battery cell via the two graphite sheets, including:

[0015] The two semiconductor cooling plates are respectively disposed on opposite sides except for the side where the cell protection plate is located, and are connected to the upper and lower sides of the battery cell via the two graphite sheets respectively.

[0016] Optionally, when the temperature-controlled battery is in cooling mode, the semiconductor cooling chip located on the top of the battery cell is connected to the forward current, and the semiconductor cooling chip located on the bottom of the battery cell is connected to the reverse current. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet and connected to the battery cell is the cooling surface.

[0017] When the temperature-controlled battery is in heating mode, the semiconductor cooling chip located on the top of the battery cell is connected to reverse current, and the semiconductor cooling chip located on the bottom of the battery cell is connected to forward current. The surfaces of the semiconductor cooling chips that are in close contact with the graphite sheet and connected to the battery cell are all heating surfaces.

[0018] Optionally, when the temperature-controlled battery is in cooling mode, a reverse current is connected through the semiconductor cooling chip connected to the top of the battery cell via the graphite sheet, and a forward current is connected through the semiconductor cooling chip connected to the bottom of the battery cell via the graphite sheet. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet is the cooling surface.

[0019] When the temperature-controlled battery is in heating mode, a forward current is connected to the semiconductor cooling chip on the top of the battery cell through the graphite sheet, and a reverse current is connected to the semiconductor cooling chip on the bottom of the battery cell through the graphite sheet. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet is the heating surface.

[0020] A battery temperature control system for controlling the temperature of the aforementioned temperature-controlled battery includes:

[0021] At least three NTC temperature sensors, an MCU processing chip, a charging control chip, a MOSFET controller, and a DC power supply;

[0022] The charging control chip is connected to the MCU processing chip;

[0023] Each NTC temperature sensor is used to detect the current temperature at each detection point on the battery cell of the temperature-controlled battery. At least one NTC temperature sensor is connected to the charging control chip, and the remaining NTC temperature sensors are directly connected to the MCU processing chip. For the NTC temperature sensor connected to the charging control chip, the NTC temperature sensor sends the detected current temperature to the charging control chip, and the charging control chip reports the detected current temperature to the MCU processing chip. For the NTC temperature sensor directly connected to the MCU processing chip, the NTC temperature sensor directly reports the detected current temperature to the MCU processing chip.

[0024] The MCU processing chip is connected to the thermoelectric cooler of the temperature-controlled battery through a MOS transistor controller. The MCU processing chip determines the working mode of the thermoelectric cooler based on the received current temperatures and switches the working mode of the thermoelectric cooler through the MOS transistor controller.

[0025] The DC power supply is connected to the MOS transistor controller and is used to provide power for the entire battery temperature control system.

[0026] Optionally, the MOS transistor controller includes two MOS transistor drivers and a MOS transistor H-bridge;

[0027] The MOS transistor driver is connected to the MOS transistor H-bridge, and each MOS transistor driver is connected to the MCU processing chip through its corresponding I / O port.

[0028] The MOS transistor H-bridge circuit switches the operating mode of the thermoelectric cooler by adjusting the power supply direction to the thermoelectric cooler.

[0029] Optionally, the I / O port corresponding to the MOS transistor driver has a timer function;

[0030] The MOSFET driver controls the conduction time of the MOSFET H-bridge using PWM technology, thereby controlling the operating power of the semiconductor cooling chip.

[0031] A battery temperature control method, applied to the aforementioned battery temperature control system, the method comprising:

[0032] Obtain the current temperature of each detection point on the battery cell of the temperature-controlled battery;

[0033] The operating mode of the thermoelectric cooler of the temperature control battery is determined based on the received current temperatures.

[0034] The operating mode of the semiconductor cooling chip is switched.

[0035] Optionally, determining the operating mode of the thermoelectric cooler of the temperature control battery based on the received current temperatures includes:

[0036] Determine the maximum and minimum current temperatures among the received current temperatures;

[0037] Detect whether the maximum current temperature and the minimum current temperature are within the range of a preset standard temperature threshold;

[0038] If the maximum battery temperature is greater than the maximum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be cooling mode.

[0039] If the minimum battery temperature is less than the minimum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be the heating mode.

[0040] If both the maximum current temperature and the minimum current temperature are within the range of a preset standard temperature threshold, then the operating mode of the semiconductor refrigeration chip is determined to be the normal mode.

[0041] As can be seen from the above technical solutions, the embodiments of this application provide a temperature-controlled battery, a battery temperature control system, and a battery temperature control method. The temperature-controlled battery consists of a battery cell, two semiconductor cooling chips, two graphite sheets, a thermally conductive bracket, a cell protection plate, and a heat insulation layer. The cell protection plate is disposed on one side of the battery cell. The two semiconductor cooling chips are respectively connected to the upper and lower sides of the battery cell via the two graphite sheets. Three detection point selection areas are provided on the battery cell, located on the upper and lower sides of the battery cell and the side where the cell protection plate is located. The detection point selection areas are used to determine each detection point.

[0042] The NTC temperature sensor in the battery temperature control system detects each detection point to determine the current temperature. The MCU processing chip determines the operating mode of the thermoelectric cooler based on the received current temperature of each detection point, and switches the operating mode of the thermoelectric cooler through the MOS transistor controller.

[0043] Because existing temperature sampling locations are limited to a single point, and different areas of the battery cell have different structures and thermal resistances, a single temperature sampling often cannot fully reflect the temperature of the main body of the cell. Furthermore, it may be affected by charging current and motherboard heating, leading to inaccurate cell temperature monitoring. This application addresses this by setting three detection point selection areas on the battery cell, from which multiple sampling points can be selected. By combining the temperatures of each sampling point, the operating mode of the semiconductor cooling chip can be determined. This effectively avoids the problem that a single temperature sampling cannot fully represent the existing battery temperature state, resulting in more accurate and timely temperature monitoring. Switching the operating mode of the semiconductor cooling chip can more accurately control the battery temperature, ensuring the battery maintains normal operation under complex environmental temperatures. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of a battery temperature control system disclosed in an embodiment of this application;

[0046] Figure 2 This is a flowchart of a battery temperature control method disclosed in an embodiment of this application;

[0047] Figure 3 This is a schematic diagram of a detection point selection area disclosed in an embodiment of this application;

[0048] Figure 4 This is a schematic diagram of the structure of the first type of temperature-controlled battery disclosed in the embodiments of this application;

[0049] Figure 5 This is a schematic diagram of the operation of the first type of temperature-controlled battery disclosed in the embodiments of this application in cooling mode;

[0050] Figure 6 This is a schematic diagram of the operation of the first type of temperature-controlled battery disclosed in the embodiments of this application in the heating mode;

[0051] Figure 7 This is a schematic diagram of the structure of the second type of temperature-controlled battery disclosed in the embodiments of this application;

[0052] Figure 8 This is a schematic diagram of the operation of the second type of temperature-controlled battery disclosed in the embodiments of this application in cooling mode;

[0053] Figure 9 This is a schematic diagram of the operation of the second type of temperature-controlled battery disclosed in the embodiments of this application in the heating mode. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0055] The following section introduces the solution proposed in this application. The technical solution is as follows, and details are provided below.

[0056] This application first introduces a battery temperature control system that can control the temperature of a temperature-controlled battery.

[0057] Figure 1 This is a schematic diagram of a battery temperature control system disclosed in an embodiment of this application, as shown below. Figure 1 As shown, the system may include: at least three NTC temperature sensors, an MCU processing chip, a charging control chip, a MOSFET controller, and a DC power supply.

[0058] The charging control chip is connected to the MCU processing chip. The DC power supply is connected to the MOSFET controller and is used to provide power for the entire battery temperature control system.

[0059] DC power can be either an external charger or a suitable power source converted from battery output.

[0060] NTC temperature sensor:

[0061] Each NTC temperature sensor is used to detect the current temperature at each detection point on the battery cell of the temperature-controlled battery. At least one NTC temperature sensor is connected to the charging control chip, and the remaining NTC temperature sensors are directly connected to the MCU processing chip. For the NTC temperature sensor connected to the charging control chip, the NTC temperature sensor sends the detected current temperature to the charging control chip, and the charging control chip reports the detected current temperature to the MCU processing chip. For the NTC temperature sensor directly connected to the MCU processing chip, the NTC temperature sensor directly reports the detected current temperature to the MCU processing chip.

[0062] Specifically, an NTC temperature sensor is a device that uses an NTC thermistor as a temperature probe. Its principle is that the sensor's resistance decreases as temperature rises, with a one-to-one correspondence between resistance and temperature. Its RT curve strictly follows a given digital model to present this relationship. In temperature monitoring mode, multiple NTC temperature sensors are placed close to the battery cell. Leveraging the low thermal resistance of NTC temperature sensors and the characteristic that NTC thermistors exhibit different resistance values ​​with temperature, the cell temperature can be monitored quickly and accurately. In this application, by setting at least three NTC temperature sensors located at different positions on the battery cell and attaching them to the cell for temperature monitoring, the detection results can more effectively and comprehensively reflect the overall temperature of the battery. This increases the number of temperature detection points for comprehensive monitoring of the cell temperature, avoiding the influence of a single sampling location and improving the accuracy of temperature monitoring. Furthermore, by placing NTC temperature sensors on both sides and the sides of the battery cell, it is possible to avoid misjudgments of the battery condition due to differences in thermal resistance caused by variations in structural areas.

[0063] In this application, at least one NTC temperature sensor should be connected to the charging control chip, while the remaining NTC temperature sensors should be directly connected to the MCU processing chip. The detection points are randomly or manually selected from a preset detection point selection area. The NTC temperature sensor connected to the charging control chip measures the temperature at the detection point on the side where the cell protection board of the temperature-controlled battery is located, i.e., the side where the battery charging port is located. The remaining NTC temperature sensors measure the temperature at detection points on the top and bottom surfaces of the battery cells of the temperature-controlled battery. It is understood that, considering that the top and bottom surfaces of a typical battery structure do not have a clear functional distinction, this application does not distinguish between the top and bottom surfaces of the temperature-controlled battery. That is, the top surface of the temperature-controlled battery can be flipped to become the bottom surface, and vice versa. It is sufficient to state here that the top and bottom surfaces are two opposite surfaces of the temperature-controlled battery.

[0064] For the NTC temperature sensor connected to the charging control chip, the NTC temperature sensor sends the detected current temperature to the charging control chip, and the charging control chip then reports the detected current temperature to the MCU processing chip. In other words, the NTC temperature sensor measuring the temperature at the detection point on the side where the battery cell protection board is located (i.e., the NTC temperature sensor on the side where the battery charging port is located) first needs to send the detected current temperature to the charging control chip. After obtaining the current temperature on the side where the battery charging port is located, the charging control chip communicates with the MCU processing chip and reports the current temperature to the MCU processing chip.

[0065] For NTC temperature sensors directly connected to the MCU processing chip, the NTC temperature sensor directly reports the detected current temperature to the MCU processing chip. In other words, the NTC temperature sensors that measure the temperature at the detection points on the top and bottom of the battery cells of the temperature-controlled battery communicate directly with the MCU processing chip through their respective I / O ports, and report the current temperature to the MCU processing chip through the I / O ports after detecting it.

[0066] Compared to existing single-point sampling temperature measurement technologies, this application offers several advantages: first, it avoids the problem of incomplete temperature readings due to a single temperature detection point; second, it avoids significant deviations between the temperature measured at a single sampling point and the actual battery cell temperature caused by variations in thermal resistance across different structural regions; and third, it avoids inaccurate cell temperature monitoring due to the influence of charging current and motherboard heating on the cell protection board's temperature. This application's temperature detection method effectively avoids these issues, providing more accurate and timely temperature monitoring and significantly improving the precision and reliability of temperature control.

[0067] MCU processing chip:

[0068] The MCU processing chip is connected to the thermoelectric cooler of the temperature-controlled battery through a MOS transistor controller. The MCU processing chip determines the operating mode of the thermoelectric cooler based on the received current temperatures and switches the operating mode of the thermoelectric cooler through the MOS transistor controller.

[0069] Specifically, the MCU processing chip is connected to the thermoelectric cooler of the temperature-controlled battery via a MOSFET controller, and switches the operating mode of the thermoelectric cooler by controlling the mode of the MOSFET controller. The MCU processing chip receives the current temperature of each detection point uploaded by each NTC temperature sensor, and determines the operating mode of the thermoelectric cooler based on the received current temperature. Specifically, it filters the maximum and minimum temperature values ​​transmitted back to the MCU processing chip. The maximum and minimum values ​​corresponding to high and low temperatures determine the operating mode of the thermoelectric cooler, including holiday mode and cooling mode, and controls the MOSFET controller to switch the operating mode of the thermoelectric cooler to perform heating and cooling operations on the battery accordingly.

[0070] MOSFET controller:

[0071] The MOSFET controller may further include two MOSFET drivers and a MOSFET H-bridge.

[0072] The MOS transistor driver is connected to the MOS transistor H-bridge, and each MOS transistor driver is connected to the MCU processing chip through its corresponding I / O port.

[0073] The MOS transistor H-bridge circuit switches the operating mode of the thermoelectric cooler by adjusting the power supply direction to the thermoelectric cooler.

[0074] Specifically, one end of each of the two MOSFET drivers is connected to an MCU processing chip through two corresponding I / O ports, and the other end of the two MOSFET drivers is connected to a MOSFET H-bridge. After the MCU controller analyzes the received current temperatures and determines the current working mode of the thermoelectric cooler, it switches the working mode through the MOSFET controller composed of the two MOSFET drivers and the MOSFET H-bridge.

[0075] Specifically, the MOSFET controller, composed of a MOSFET driver and a MOSFET H-bridge circuit, can determine the operating mode of the thermoelectric cooler by comprehensively judging whether the current temperature-controlled battery is in a low or high temperature state based on the current temperature detection. Through the MOSFET H-bridge structure, the thermoelectric cooler can be powered in both forward and reverse directions, thereby controlling the temperature-controlled battery and the battery temperature control system to heat or cool the battery without structural changes. This ensures that the temperature of the temperature-controlled battery is always kept within the preset standard temperature threshold, guaranteeing the normal power supply of the main equipment in emergency situations.

[0076] Optionally, the I / O port corresponding to the MOS transistor driver can also be an I / O port with a timer function.

[0077] The MOSFET driver controls the conduction time of the MOSFET H-bridge using PWM technology, thereby controlling the operating power of the semiconductor cooling chip.

[0078] Specifically, the I / O ports corresponding to the two MOS transistor drivers can also be I / O ports with timer functions. I / O ports with timer functions can effectively control the conduction time of the MOS transistor H-bridge through PWM technology, thereby controlling the operating power of the thermoelectric cooler to meet the needs of different situations and usage scenarios. For example, if the temperature of the temperature-controlled battery is currently detected to be just above the maximum value of the preset standard temperature threshold, a slight cooling can ensure that the temperature of the temperature-controlled battery returns to within the standard temperature threshold. In this case, the thermoelectric cooler does not need to operate at full power; it can operate at low power to slightly cool the temperature-controlled battery.

[0079] Furthermore, it is conceivable that this application can also adjust the heating or cooling power according to the degree of heating or cooling through an I / O port with a timer function during the heating or cooling process. In this application, the MCU processing chip analyzes and determines the operating mode, and the MOSFET controller controls and implements the switching of the operating mode.

[0080] As can be seen from the above technical solution, the battery temperature control system provided in this application consists of at least three NTC temperature sensors, an MCU processing chip, a charging control chip, a MOSFET controller, and a DC power supply. Each NTC temperature sensor detects the current temperature at each detection point on the battery cell of the temperature-controlled battery, and reports the detected current temperature at each detection point directly or via the charging control chip to the MCU processing chip. The MCU processing chip determines the operating mode of the thermoelectric cooler based on the received current temperature at each detection point, and switches the operating mode of the thermoelectric cooler via the MOSFET controller.

[0081] Because existing temperature sampling locations are limited to a single point, and different areas of the battery cell have different structures and thermal resistances, a single temperature sampling often cannot fully reflect the temperature of the main body of the cell. At the same time, it may be affected by charging current and motherboard heating, leading to inaccurate cell temperature monitoring. This application sets multiple sampling points on the battery cell and combines the temperatures of each sampling point to determine the working mode of the semiconductor cooling chip. This can effectively avoid the problem that a single temperature sampling cannot fully represent the existing battery temperature status, making temperature monitoring more accurate and timely. Switching the working mode of the semiconductor cooling chip can more accurately achieve temperature control of the battery, ensuring that the battery can maintain normal use in complex environmental temperatures.

[0082] This application provides a battery temperature control method that can be applied to the battery temperature control system described above. This method can effectively avoid the problem that a single temperature sample cannot fully represent the existing battery temperature state, and achieve timely and accurate control of battery temperature, ensuring that the battery can maintain normal operation under complex environmental temperatures.

[0083] The battery temperature control method described below can be used in conjunction with the battery temperature control system described above, and the various steps of the battery temperature control method described below can be implemented in the battery temperature control system described above.

[0084] Figure 2 This is a flowchart of a battery temperature control method disclosed in an embodiment of this application, such as... Figure 2 As shown, the method specifically includes:

[0085] Step S1: Obtain the current temperature of each detection point on the battery cell of the temperature-controlled battery.

[0086] Specifically, the current temperature of each detection point on the battery cell of the temperature-controlled battery is obtained through various NTC temperature sensors. At least three detection points must be used. Figure 3As shown, the NTC temperature sensor that detects the temperature of the detection point in NTC detection selection area 2 is inherent on the cell protection board. It mainly monitors the temperature on the side where the battery charging port is located. The upper and lower sides of the temperature-controlled battery are also equipped with NTC temperature sensors to detect the temperature of the detection points in NTC detection selection area 1 and NTC detection selection area 3, that is, the temperature of the front and back sides of the battery cell.

[0087] In this application, by obtaining the current temperature of at least three detection points located at different positions on the battery cell, the detection results can more effectively and comprehensively reflect the overall temperature of the battery. That is, by increasing the number of temperature detection points to comprehensively monitor the cell temperature, the influence of a single sampling location is avoided, and the accuracy of temperature monitoring is improved. At the same time, by setting detection points on both sides and the side of the battery cell, the deviation of temperature test results caused by different thermal resistance in different temperature control battery structure areas can be avoided, thus avoiding misjudgment of the battery condition.

[0088] Step S2: Determine the operating mode of the thermoelectric cooler of the temperature control battery based on the received current temperatures.

[0089] Specifically, this application prioritizes safety and implements a principle of effective temperature control based on the maximum high temperature and minimum low temperature. This means that if an abnormal temperature is detected at any one detection point, temperature control is initiated, either by raising or lowering the temperature, effectively ensuring both practicality and safety. The specific steps are as follows:

[0090] ① Determine the maximum and minimum current temperatures among the received current temperatures.

[0091] ② Detect whether the maximum current temperature and the minimum current temperature are within the range of a preset standard temperature threshold.

[0092] ③ If the maximum battery temperature is greater than the maximum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be the cooling mode.

[0093] ④ If the lowest battery temperature is less than the minimum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be the heating mode.

[0094] ⑤ If both the maximum current temperature and the minimum current temperature are within the range of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be the normal mode.

[0095] The received current temperatures are filtered for maximum and minimum values ​​to determine the maximum and minimum current temperatures. It is then determined whether the maximum and minimum current temperatures are within the range of a preset standard temperature threshold, which is artificially preset based on experimental experience.

[0096] If both the maximum current temperature and the minimum current temperature are within the range of the preset standard temperature threshold, it indicates that the current temperature control battery is at a normal temperature and there is no need to heat up or cool down. Therefore, the working mode of the semiconductor refrigeration chip is determined to be the normal mode, that is, the semiconductor refrigeration chip does not heat up or cool down.

[0097] If the maximum current temperature is not within the preset standard temperature threshold range, but the maximum current temperature is greater than the maximum value of the preset standard temperature threshold, it indicates that the temperature of the current temperature-controlled battery cell is high, and the operating mode of the thermoelectric cooler is determined to be cooling mode. Conversely, if the minimum current temperature is not within the preset standard temperature threshold range, but the minimum battery temperature is less than the minimum value of the preset standard temperature threshold, it indicates that the temperature of the current temperature-controlled battery cell is low, and the operating mode of the thermoelectric cooler is determined to be heating mode.

[0098] Step S3: Switch the operating mode of the semiconductor refrigeration chip.

[0099] Specifically, when the determined operating mode of the thermoelectric cooler is the normal mode, the operating mode of the thermoelectric cooler is switched to the normal mode by the MOS transistor controller, and the thermoelectric cooler neither heats up nor cools down.

[0100] When the working mode of the thermoelectric cooler is determined to be cooling mode, the working mode of the thermoelectric cooler is switched to cooling mode by the MOS transistor controller to cool down the temperature-controlled battery cell.

[0101] When the working mode of the thermoelectric cooler is determined to be the heating mode, the MOS transistor controller controls the thermoelectric cooler to switch to the heating mode to heat the temperature-controlled battery cell.

[0102] As can be seen from the above technical solution, the battery temperature control method provided in this application detects and acquires the current temperature of each detection point on the battery cell of the temperature-controlled battery through each NTC temperature sensor. The MCU processing chip determines the operating mode of the thermoelectric cooler of the temperature-controlled battery based on the received current temperature of each detection point, and switches the operating mode of the thermoelectric cooler through a MOS transistor controller.

[0103] Because existing temperature sampling locations are limited to a single point, and different areas of the battery cell have different structures and thermal resistances, a single temperature sampling often cannot fully reflect the temperature of the main body of the cell. At the same time, it may be affected by charging current and motherboard heating, leading to inaccurate cell temperature monitoring. This application sets multiple sampling points on the battery cell and combines the temperatures of each sampling point to determine the working mode of the semiconductor cooling chip. This can effectively avoid the problem that a single temperature sampling cannot fully represent the existing battery temperature status, making temperature monitoring more accurate and timely. Switching the working mode of the semiconductor cooling chip can more accurately achieve temperature control of the battery, ensuring that the battery can maintain normal use in complex environmental temperatures.

[0104] This application provides a temperature-controlled battery that can be applied to the aforementioned battery temperature control system. The temperature of the battery is controlled by the aforementioned battery temperature control system, and the control method for the battery is the aforementioned battery temperature control method. The temperature-controlled battery described below, the battery temperature control system described above, and the battery temperature control method described above can all be referred to in correspondence.

[0105] The composition, structure, and function of the temperature-controlled battery will be described in detail below.

[0106] A temperature-controlled battery may include:

[0107] Battery cell, two semiconductor cooling chips, two graphite sheets, thermally conductive bracket, cell protection board, and insulation layer.

[0108] The cell protection board is located on one side of the battery cell.

[0109] The two semiconductor cooling chips are respectively connected to the upper and lower sides of the battery cell via the two graphite sheets.

[0110] The battery cell has three detection point selection areas, located on the top and bottom surfaces of the battery cell and the side where the cell protection board is located. The detection point selection areas are used by each NTC temperature sensor to determine the detection point and detect the current temperature.

[0111] Specifically, such as Figure 3The battery cell shown has three detection point selection areas, located on the top and bottom surfaces of the battery cell, and on the side where the cell protection plate is located. The detection points are randomly or manually selected from the preset detection point selection areas; that is, selections are made from the three detection point selection areas on the battery cell. Detection point selection area 1 and detection point selection area 3 are two opposite surfaces. Detection point selection area 1 is located on the top surface of the battery cell, and the detection points in this area detect the current temperature of the top surface of the battery cell. Detection point selection area 3 is located on the bottom surface of the battery cell, and the detection points in this area detect the current temperature of the bottom surface of the battery cell. Detection point selection area 2 is located on the side where the cell protection plate is located, and the detection points in this area detect the current temperature of the side where the battery charging port is located.

[0112] It is understandable that, considering that there is no obvious functional distinction between the top and bottom sides in a typical battery structure, this application does not distinguish between the top and bottom sides of the temperature control battery. That is, the top side of the temperature control battery can become the bottom side after being flipped, and the bottom side of the temperature control battery can become the top side after being flipped. Here, it is only necessary to explain that the top and bottom sides are two opposite sides of the battery.

[0113] This application provides two optional structural configurations for temperature-controlled batteries.

[0114] Before introducing the two optional structural configurations, we will first introduce the semiconductor refrigeration chip.

[0115] A thermoelectric cooler (TEC) works by welding together thermocouples containing N-type and P-type semiconductors using metal connectors. When current flows through the thermocouple, heat transfer occurs between the two ends, creating a temperature difference and forming hot and cold ends. The end that absorbs heat is called the cold end, while the opposite end that releases heat is called the hot end. If the current direction is reversed, the hot and cold ends switch roles. Because a single thermocouple produces a relatively small heating effect, thermoelectric coolers are typically constructed by connecting dozens or even hundreds of thermocouples. Therefore, cooling in a thermoelectric cooler involves heat absorption at one end and heat release at the other, creating both a cooling surface and a heating surface. This device has advantages such as low thermal inertia and rapid heating and cooling times. With good heat dissipation at the hot end and no load at the cold end, the thermoelectric cooler often reaches its maximum temperature difference in less than a minute after being energized.

[0116] The following sections will explain the two optional structures and the corresponding working mode switching methods.

[0117] The first type

[0118] The two semiconductor cooling chips are respectively disposed on the upper and lower surfaces of the battery cell, and are uniformly attached to the upper and lower surfaces of the battery cell via the two graphite sheets.

[0119] Figure 4 This is a schematic diagram of the structure of the first type of temperature-controlled battery. Figure 5 and Figure 6 These are schematic diagrams showing the operation of the first type of temperature-controlled battery in cooling mode and heating mode, respectively. Figures 4 to 6 In the diagram, 10 and 14 are two semiconductor cooling chips, 11 and 13 are two graphite sheets, 12 is a battery cell, 15 is a thermally conductive support, 16 is a heat insulation layer, and 17 is a cell protection board.

[0120] Two semiconductor cooling chips are respectively disposed on the upper and lower sides of the battery cell. The graphite sheet, battery cell, and semiconductor cooling chip are stacked in layers, and from top to bottom, they are semiconductor cooling chip 10, graphite sheet 11, battery cell 12 / cell protection board 17, graphite sheet 13, semiconductor cooling chip 14, heat-conducting bracket 15, and heat insulation layer 16.

[0121] The following are combined with Figure 5 and Figure 6 The structure of the first type of temperature-controlled battery and its operation in cooling and heating modes are described separately.

[0122] Cooling mode:

[0123] When the working mode is cooling mode, the semiconductor cooling chip 10 located on the top of the battery cell 12 is connected to the forward current, and the semiconductor cooling chip 14 located on the bottom of the battery cell 12 is connected to the reverse current. The surfaces of the semiconductor cooling chip 10 and the semiconductor cooling chip 14 that are in close contact with the graphite sheet 11 and the graphite sheet 13 and are connected to the battery cell 12 are all cooling surfaces.

[0124] like Figure 5 As shown, the thermoelectric cooler 10 and thermoelectric cooler 14 are composed of two sides, where the dark side represents the heating side of the thermoelectric cooler and the white side represents the cooling side. When the operating mode is cooling mode, the thermoelectric cooler 10 located on top of the battery cell 12 is connected to a forward current. At this time, the top of the thermoelectric cooler 10 connected to the top of the battery cell 12 is the heating side, and the bottom is the cooling side. The thermoelectric cooler 14 located on the bottom of the battery cell 12 is connected to a reverse current. The top of the thermoelectric cooler 14 connected to the bottom of the battery cell 12 is the cooling side, and the bottom is the heating side. The surfaces of the thermoelectric coolers 10 and 14 that are in close contact with the graphite sheets 11 and 13 and connected to the battery cell 12 are all cooling surfaces, thus achieving cooling of the battery cell 12.

[0125] Heating mode:

[0126] When the working mode is heating mode, the semiconductor cooling chip 10 located on the top of the battery cell 12 is connected to reverse current, and the semiconductor cooling chip 14 located on the bottom of the battery cell 12 is connected to forward current. The surfaces of the semiconductor cooling chip 10 and the semiconductor cooling chip 14 that are in close contact with the graphite sheet 11 and the graphite sheet 13 and connected to the battery cell 12 are both heating surfaces.

[0127] like Figure 6 As shown, the thermoelectric cooler 10 and thermoelectric cooler 14 are composed of two sides, where the dark side represents the heating side of the thermoelectric cooler and the white side represents the cooling side. When the operating mode is the heating mode, the thermoelectric cooler 10 located on top of the battery cell 12 receives a reverse current. At this time, the top of the thermoelectric cooler 10 connected to the top of the battery cell 12 is the cooling side, and the bottom is the heating side. The thermoelectric cooler 14 located on the bottom of the battery cell 12 receives a forward current. The top of the thermoelectric cooler 14 connected to the bottom of the battery cell 12 is the heating side, and the bottom is the cooling side. The surfaces of the thermoelectric coolers 10 and 14 that are in close contact with the graphite sheets 11 and 13 and connected to the battery cell 12 are all heating surfaces, thus enabling the heating of the battery cell 12.

[0128] The second type

[0129] The two semiconductor cooling plates are respectively disposed on opposite sides except for the side where the cell protection plate is located, and are connected to the upper and lower sides of the battery cell via the two graphite sheets respectively.

[0130] Figure 7 This is a schematic diagram of the structure of the second type of temperature-controlled battery. Figure 8 and Figure 9 These are schematic diagrams illustrating the operation of the second type of temperature-controlled battery in cooling and heating modes, respectively. Figures 7 to 9 In the diagram, 21 and 23 are two semiconductor cooling chips, 20 and 24 are two graphite sheets, 22 is a battery cell, 25 is a thermally conductive support, 26 is a heat insulation layer, and 27 is a cell protection board.

[0131] Two semiconductor cooling chips are disposed on opposite sides of the battery cell 22, excluding the side where the cell protection plate 27 is located, and are arranged side by side with the battery cell 22. Graphite sheets 20 and 24 are respectively disposed on the upper and lower sides of the battery cell 22. The two graphite sheets are respectively connected to the upper and lower sides of the battery cell 22. The graphite sheets are extended so that the upper and lower sides of the battery cell 22 are respectively connected to the two semiconductor cooling chips disposed on both sides of the battery cell 22.

[0132] Compared to the first structural arrangement, the second arrangement extends the graphite sheet and places two semiconductor cooling plates on opposite sides of the battery cell 22, excluding the side where the cell protection plate 27 is located. They are arranged side by side with the cell. Compared to the first arrangement, the thickness is lower, which compresses the overall thickness of the battery and can meet the temperature management requirements in situations with limited space. Temperature-controlled batteries made with this structure are suitable for some flat spaces.

[0133] The following are combined with Figure 8 and Figure 9 The structure of the second type of temperature-controlled battery and its operation in both cooling and heating modes will be introduced separately.

[0134] Cooling mode:

[0135] When the working mode is cooling mode, reverse current is connected through the semiconductor cooling chip 23 connected to the top of the battery cell 22 via the graphite sheet 20, and forward current is connected through the semiconductor cooling chip 21 connected to the bottom of the battery cell 22 via the graphite sheet 24. The surfaces of the semiconductor cooling chips 21 and 23 that are in close contact with the graphite sheets 24 and 20 are both cooling surfaces.

[0136] like Figure 8 As shown, thermoelectric coolers 21 and 23 are composed of two sides, where the dark side represents the heating side and the white side represents the cooling side. When the operating mode is cooling mode, the thermoelectric cooler 23 connected to the top of the battery cell 22 via the graphite sheet 20 is connected to a reverse current. At this time, the top of the thermoelectric cooler 23 connected to the top of the battery cell 22 is the heating side, and the bottom is the cooling side. Similarly, the thermoelectric cooler 21 connected to the bottom of the battery cell 22 via the graphite sheet 24 is connected to a forward current. The top of the thermoelectric cooler 21 connected to the bottom of the battery cell 22 is the heating side, and the bottom is the cooling side. The surfaces of thermoelectric coolers 21 and 23 that are in close contact with the graphite sheets 24 and 20 and connected to the battery cell 22 are both cooling surfaces, thus achieving cooling of the battery cell 22.

[0137] Heating mode:

[0138] When the working mode is heating mode, the forward current is connected to the semiconductor cooling chip 23 connected to the top of the battery cell 22 through the graphite sheet 20, and the reverse current is connected to the semiconductor cooling chip 21 connected to the bottom of the battery cell 22 through the graphite sheet 24. The surfaces of the semiconductor cooling chips 21 and 23 that are in close contact with the graphite sheets 24 and 20 are both heating surfaces.

[0139] like Figure 9As shown, thermoelectric coolers 21 and 23 are composed of two sides, where the dark side represents the heating side and the white side represents the cooling side. When the operating mode is heating mode, the thermoelectric cooler 23 connected to the top of the battery cell 22 via the graphite sheet 20 is connected to a forward current. At this time, the top of the thermoelectric cooler 23 connected to the top of the battery cell 22 is the cooling side, and the bottom is the heating side. Conversely, the thermoelectric cooler 21 connected to the bottom of the battery cell 22 via the graphite sheet 24 is connected to a reverse current. The top of the thermoelectric cooler 21 connected to the bottom of the battery cell 22 is the cooling side, and the bottom is the heating side. The sides of thermoelectric coolers 21 and 23 that are in close contact with the graphite sheets 24 and 20 are both heating sides, thus achieving cooling of the battery cell 22.

[0140] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0141] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0142] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A temperature-controlled battery, characterized in that, include: Battery cell, two semiconductor cooling chips, two graphite sheets, thermally conductive bracket, cell protection board, and heat insulation layer; The cell protection board is disposed on one side of the battery cell; The two semiconductor cooling wafers are respectively connected to the upper and lower surfaces of the battery cell via the two graphite sheets, including: The two semiconductor cooling chips are respectively disposed on opposite sides except for the side where the cell protection board is located, and are connected to the upper and lower sides of the battery cell via the two graphite sheets respectively. The battery cell has three detection point selection areas, located on the top and bottom surfaces of the battery cell and the side where the cell protection board is located. The detection point selection areas are used to determine each detection point and to determine the current temperature by detecting each detection point through an NTC temperature sensor.

2. The temperature-controlled battery according to claim 1, characterized in that, The two semiconductor cooling wafers are respectively connected to the upper and lower surfaces of the battery cell via the two graphite sheets, including: The two semiconductor cooling chips are respectively disposed on the upper and lower surfaces of the battery cell, and are uniformly attached to the upper and lower surfaces of the battery cell via the two graphite sheets.

3. The temperature-controlled battery according to claim 2, characterized in that, When the temperature-controlled battery is in cooling mode, the semiconductor cooling chip located on the top of the battery cell is connected to the forward current, and the semiconductor cooling chip located on the bottom of the battery cell is connected to the reverse current. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet and connected to the battery cell is the cooling surface. When the temperature-controlled battery is in heating mode, the semiconductor cooling chip located on the top of the battery cell is connected to reverse current, and the semiconductor cooling chip located on the bottom of the battery cell is connected to forward current. The surfaces of the semiconductor cooling chips that are in close contact with the graphite sheet and connected to the battery cell are all heating surfaces.

4. The temperature-controlled battery according to claim 1, characterized in that, When the temperature-controlled battery is in cooling mode, reverse current is connected through the semiconductor cooling chip connected to the top of the battery cell via the graphite sheet, and forward current is connected through the semiconductor cooling chip connected to the bottom of the battery cell via the graphite sheet. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet is the cooling surface. When the temperature-controlled battery is in heating mode, a forward current is connected to the semiconductor cooling chip on the top of the battery cell through the graphite sheet, and a reverse current is connected to the semiconductor cooling chip on the bottom of the battery cell through the graphite sheet. The surface of the semiconductor cooling chip that is in close contact with the graphite sheet is the heating surface.

5. A battery temperature control system, characterized in that, Temperature control of the temperature-controlled battery according to any one of claims 1-4 includes: At least three NTC temperature sensors, an MCU processing chip, a charging control chip, a MOSFET controller, and a DC power supply; The charging control chip is connected to the MCU processing chip; Each NTC temperature sensor is used to detect the current temperature at each detection point on the battery cell of the temperature-controlled battery. At least one NTC temperature sensor is connected to the charging control chip, and the remaining NTC temperature sensors are directly connected to the MCU processing chip. For the NTC temperature sensor connected to the charging control chip, the NTC temperature sensor sends the detected current temperature to the charging control chip, and the charging control chip reports the detected current temperature to the MCU processing chip. For the NTC temperature sensor directly connected to the MCU processing chip, the NTC temperature sensor directly reports the detected current temperature to the MCU processing chip. The MCU processing chip is connected to the thermoelectric cooler of the temperature-controlled battery through a MOS transistor controller. The MCU processing chip determines the working mode of the thermoelectric cooler based on the received current temperatures and switches the working mode of the thermoelectric cooler through the MOS transistor controller. The DC power supply is connected to the MOS transistor controller and is used to provide power for the entire battery temperature control system.

6. The system according to claim 5, characterized in that, The MOSFET controller includes two MOSFET drivers and a MOSFET H-bridge; The MOS transistor driver is connected to the MOS transistor H-bridge, and each MOS transistor driver is connected to the MCU processing chip through its corresponding I / O port. The MOS transistor H-bridge circuit switches the operating mode of the thermoelectric cooler by adjusting the power supply direction to the thermoelectric cooler.

7. The system according to claim 6, characterized in that, The I / O port corresponding to the MOS transistor driver has a timer function; The MOSFET driver controls the conduction time of the MOSFET H-bridge using PWM technology, thereby controlling the operating power of the semiconductor cooling chip.

8. A battery temperature control method, characterized in that, The method, applied to the battery temperature control system as described in any one of claims 5-7, comprises: Obtain the current temperature of each detection point on the battery cell of the temperature-controlled battery; The operating mode of the thermoelectric cooler of the temperature control battery is determined based on the received current temperatures. The operating mode of the semiconductor cooling chip is switched.

9. The method according to claim 8, characterized in that, The step of determining the operating mode of the thermoelectric cooler of the temperature control battery based on the received current temperatures includes: Determine the maximum and minimum current temperatures among the received current temperatures; Detect whether the maximum current temperature and the minimum current temperature are within the range of a preset standard temperature threshold; If the maximum battery temperature is greater than the maximum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be cooling mode. If the minimum battery temperature is less than the minimum value of the preset standard temperature threshold, then the working mode of the semiconductor cooling chip is determined to be the heating mode. If both the maximum current temperature and the minimum current temperature are within the range of a preset standard temperature threshold, then the operating mode of the semiconductor refrigeration chip is determined to be the normal mode.

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