Battery pack temperature control system and temperature control method

Abstract

The invention discloses a battery pack temperature control system which comprises a battery pack, a controllable turning plate is arranged on the surface of the battery pack, a semiconductor chilling plate is embedded in a heat dissipation area, an outer heat dissipation sheet and an inner heat dissipation sheet are arranged on the inner side and the outer side of the semiconductor chilling plate respectively, an outer fan is installed on the outer side of the outer heat dissipation sheet, and an inner fan is installed on the outer side of the inner heat dissipation sheet. An inner fan is installed on the inner side of the inner cooling fin, and temperature sensors are installed at a plurality of positions inside and outside the battery pack respectively. According to the technical scheme, the main controller controls the heat dissipation modes of the battery pack according to the temperature parameters of multiple positions inside and outside the battery pack, the heat dissipation modes comprise the cooling inner circulation mode and the cooling outer circulation mode, the cooling effects of the different cooling modes are different, and the cooling modes are suitable for the current application environment of the battery pack, so that the optimal battery cooling effect of the battery pack is achieved.

Description

Technical Field

[0001] The present invention relates to the field of intelligent control technology, and more specifically to a battery pack temperature control system and a temperature control method. Background Art

[0002] Batteries are widely used in various electrical products. For high-power electrical products, the battery charging and discharging current is large during startup and operation, and the battery temperature change caused by the thermal effect of the current also becomes larger. In order to increase the service life of the battery and avoid frequent battery replacement, technical personnel in this field will set a heat dissipation device for the battery to control the battery temperature.

[0003] The existing heat dissipation methods for batteries include using a compressor to dissipate heat or cool the battery compartment, or using low-temperature liquid for cooling, or using air cooling to dissipate heat. Using a compressor to dissipate heat or cool the battery compartment is costly, noisy, and consumes a lot of power. Using low-temperature liquid for cooling requires setting up water channels outside the battery, which is difficult to design. Using natural air cooling to dissipate heat makes it difficult to reduce the battery temperature below the ambient temperature. In summary, the existing heat dissipation and cooling solutions for batteries are poor, and it is difficult to achieve the best cooling effect for the battery. Summary of the invention

[0004] In order to solve the above technical problems, the object of the present invention is to provide a battery pack heat dissipation system and a heat dissipation method.

[0005] The technical solution adopted by the present invention to solve the problem is:

[0006] A battery pack temperature control system, comprising a battery pack, wherein a plurality of controllable flaps are arranged on the surface of the battery pack, a plurality of batteries are installed in the battery pack, an air duct is arranged outside the battery, a plurality of heat dissipation areas are arranged on one side of the battery pack, a semiconductor cooling fin is inlaid in the heat dissipation area, heat dissipation fins are arranged on the inner side and the outer side of the semiconductor cooling fin, respectively, the heat dissipation fins on the inner side of the semiconductor cooling fins are defined as inner heat dissipation fins, the heat dissipation fins on the outer side of the semiconductor cooling fins are defined as outer heat dissipation fins, an outer fan is installed on the outer side of the outer heat dissipation fins, an inner fan is installed on the inner side of the inner heat dissipation fins, and temperature sensors are respectively installed at a plurality of positions inside and outside the battery pack;

[0007] The battery pack temperature control system further includes a main controller, which is respectively connected to each of the temperature sensors, each of the semiconductor cooling sheets, each of the internal fans, each of the external fans, and each of the controllable flaps;

[0008] The main controller is configured to select and enable a cooling internal circulation mode or a cooling external circulation mode according to the detection data of each of the temperature sensors;

[0009] In the cooling internal circulation mode, the main controller controls the internal fan and the external fan to start at the same time, controls the inner side of the semiconductor refrigeration plate as the cold end and the outer side as the hot end, and controls the controllable flap to close to avoid air convection between the inside and the outside of the battery pack;

[0010] The cooling external circulation mode is that the main controller controls the start-up of the inner fan and the outer fan at the same time, controls the inner side of the semiconductor refrigeration plate as the cold end and the outer side as the hot end, and controls the controllable flap to open so that air convection is generated between the inside and the outside of the battery pack.

[0011] As a further improvement of the above technical solution, the temperature sensor detects the ambient temperature and the temperature inside the battery pack away from the side where the heat dissipation area is located;

[0012] The main controller comprises:

[0013] Setting module, used to set the maximum normal battery temperature value;

[0014] A first comparison module, used for comparing the ambient temperature with the maximum normal battery temperature value, and comparing the cavity temperature with the ambient temperature;

[0015] The mode selection module is used to start the cooling external circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is greater than the ambient temperature, and to start the cooling internal circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is less than the ambient temperature.

[0016] As a further improvement of the above technical solution, the setting module is also used to set the minimum normal battery temperature value, the first comparison module is also used to compare the ambient temperature with the minimum normal battery temperature value, and the mode selection module is also used to start the heating internal circulation mode when the ambient temperature is lower than the minimum normal battery temperature value. The heating internal circulation mode is that the main controller controls the start of the internal fan, controls the inner side of the semiconductor refrigeration plate as the hot end and the outer side as the cold end, and controls the controllable flap to close to avoid air convection between the inside and the outside of the battery pack.

[0017] As a further improvement of the above technical solution, the temperature sensor detects the battery temperature, and the setting module is further used to set a first constant value, and the difference between the maximum normal battery temperature value and the first constant value is defined as a temperature threshold;

[0018] The main controller also includes:

[0019] The power control module is used to control the semiconductor refrigeration chip to operate at maximum power when the battery temperature is between the maximum normal battery temperature value and the temperature threshold, and to control the semiconductor refrigeration chip to operate at reduced power when the battery temperature is between the temperature threshold and the minimum normal battery temperature value.

[0020] As a further improvement of the above technical solution, the setting module is also used to set a second constant value;

[0021] The main controller also includes:

[0022] a calculation module, configured to calculate a difference between the ambient temperature and the maximum normal battery temperature value when the ambient temperature is between the maximum normal battery temperature value and the minimum normal battery temperature value;

[0023] A start-up module is used to disable the cooling external circulation mode and the cooling internal circulation mode when the difference is greater than the second constant value, and to control the power control module to perform corresponding operations when the difference is less than the second constant value.

[0024] As a further improvement of the above technical solution, the setting module is also used to set a battery thermal runaway temperature threshold;

[0025] The main controller also includes:

[0026] A second comparison module, used for comparing the battery temperature with the battery thermal runaway temperature threshold;

[0027] The alarm module is used to control the battery to stop charging and discharging when the battery temperature reaches the battery thermal runaway temperature threshold, and to control the semiconductor cooling chip to operate at maximum power, while outputting an alarm signal until the battery temperature drops below the maximum normal battery temperature value.

[0028] As a further improvement of the above technical solution, the main controller further includes:

[0029] The first interrupt module is used to control the semiconductor refrigeration plate to stop being powered on, and to control the internal fan and the external fan to start, if it is detected that the battery stops charging and discharging when operating in the cooling external circulation mode or the cooling internal circulation mode, until the battery temperature drops to the maximum normal battery temperature value.

[0030] As a further improvement of the above technical solution, the temperature sensor also includes detecting the temperature of the inner heat sink, and the setting module is further used to set a third constant value, and the difference between the ambient temperature and the third constant value is defined as a condensation threshold;

[0031] The main controller also includes:

[0032] A third comparison module, used for comparing the internal radiator temperature with the condensation threshold;

[0033] The second interruption module is used to control the semiconductor refrigeration plate to stop being powered on when the temperature of the inner heat sink is lower than the condensation threshold.

[0034] The beneficial effects of the present invention are: in the present technical solution, the main controller controls the heat dissipation mode of the battery pack according to the temperature parameters at multiple locations inside and outside the battery pack, including an internal cooling circulation mode and an external cooling circulation mode. Different cooling modes have different cooling effects, which are applicable to the current application environment of the battery pack. The present solution balances the system's cooling performance and power consumption performance to achieve the best battery cooling effect for the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further explained below in conjunction with the accompanying drawings and specific implementation methods.

[0036] Figure 1 It is a structural schematic diagram of the battery pack temperature control system in the present invention. DETAILED DESCRIPTION

[0037] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] Reference Figure 1 The present application discloses a battery pack temperature control system, a first embodiment of which includes a battery pack 100, a surface of the battery pack 100 is provided with a plurality of controllable flaps 500, the controllable flaps 500 are used to control air convection inside and outside the battery pack 100, a plurality of batteries are installed in the battery pack 100, an air duct is arranged outside the battery, a side surface of the battery pack 100 is provided with a plurality of heat dissipation areas, the heat dissipation areas are inlaid with semiconductor cooling sheets 200, the inner and outer sides of the semiconductor cooling sheets 200 are respectively provided with heat dissipation sheets, the heat dissipation sheets inside the semiconductor cooling sheets 200 are defined as inner heat dissipation sheets 400, the heat dissipation sheets outside the semiconductor cooling sheets 200 are defined as outer heat dissipation sheets 300, an outer fan is installed on the outer side of the outer heat dissipation sheets 300, an inner fan is installed on the inner side of the inner heat dissipation sheets 400, and a temperature sensor 600 is respectively installed at a plurality of positions inside and outside the battery pack 100;

[0042] The battery pack 100 temperature control system further includes a main controller, which is respectively connected to each of the temperature sensors 600, each of the semiconductor cooling sheets 200, each of the internal fans, each of the external fans, and each of the controllable flaps 500;

[0043] The main controller is configured to select and enable the cooling internal circulation mode or the cooling external circulation mode according to the detection data of each of the temperature sensors 600;

[0044] In the cooling internal circulation mode, the main controller controls the internal fan and the external fan to start at the same time, controls the inner side of the semiconductor cooling plate 200 as the cold end and the outer side as the hot end, and controls the controllable flap 500 to be closed to avoid air convection between the inside and the outside of the battery pack 100;

[0045] In the cooling external circulation mode, the main controller controls the start-up of the inner fan and the outer fan at the same time, controls the inner side of the semiconductor refrigeration plate 200 as the cold end and the outer side as the hot end, and controls the controllable flap 500 to open so as to generate air convection between the inside and the outside of the battery pack 100.

[0046] Specifically, in this embodiment, the main controller controls the heat dissipation mode of the battery pack 100 according to the temperature parameters detected by the temperature sensors 600 at multiple locations inside and outside the battery pack 100, including an internal cooling circulation mode and an external cooling circulation mode. Different cooling modes have different cooling effects, which are applicable to the current application environment of the battery pack 100. This embodiment balances the cooling performance and power consumption performance, and tries to utilize the lowest loss to achieve the best battery cooling effect for the battery pack 100.

[0047] As a further preferred implementation, in this embodiment, the temperature sensor 600 detects the ambient temperature and the temperature inside the cavity of the battery pack 100 away from the side where the heat dissipation area is located;

[0048] The main controller comprises:

[0049] Setting module, used to set the maximum normal battery temperature value;

[0050] A first comparison module, used for comparing the ambient temperature with the maximum normal battery temperature value, and comparing the cavity temperature with the ambient temperature;

[0051] The mode selection module is used to start the cooling external circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is greater than the ambient temperature, and to start the cooling internal circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is less than the ambient temperature.

[0052] In this embodiment, whether to start the cooling mode is determined based on the ambient temperature. If the ambient temperature is higher than the maximum normal battery temperature, it proves that the ambient temperature is high. As long as the battery starts charging and discharging, the battery temperature will rise rapidly, which will have a great impact on the use of the battery. The cooling external circulation mode or the cooling internal circulation mode is selected to start according to the cavity temperature. When the cavity temperature is higher than the ambient temperature, the battery is cooled by external air cooled by the semiconductor refrigeration plate 200 for the best cooling effect. When the cavity temperature is lower than the ambient temperature, the battery is cooled by internal air cooled by the semiconductor refrigeration plate 200 for the best cooling effect.

[0053] Further as a preferred implementation, in this embodiment, the setting module is also used to set a minimum normal battery temperature value, the first comparison module is also used to compare the ambient temperature with the minimum normal battery temperature value, and the mode selection module is also used to start the heating internal circulation mode when the ambient temperature is lower than the minimum normal battery temperature value. The heating internal circulation mode is that the main controller controls the start of the internal fan, controls the inner side of the semiconductor refrigeration plate 200 as the hot end and the outer side as the cold end, and controls the controllable flap 500 to be closed to avoid air convection between the inside and outside of the battery pack 100.

[0054] Specifically, the present embodiment is provided with a function of heating the battery. When the ambient temperature is lower than the minimum normal battery temperature, it indicates that the battery temperature is also lower than the minimum normal battery temperature, which is not conducive to the normal start-up charge and discharge of the battery. Therefore, the battery needs to be heated to improve the reliability of the battery start-up charge and discharge. In order to improve the heating effect on the battery, the present system is only provided with a heating internal circulation mode, and there is no need to open the controllable flap 500 to prevent air convection inside and outside the battery pack 100.

[0055] As a further preferred implementation, in this embodiment, the temperature sensor 600 detects the battery temperature, and the setting module is further used to set a first constant value, and the difference between the maximum normal battery temperature value and the first constant value is defined as a temperature threshold;

[0056] The main controller also includes:

[0057] The power control module is used to control the semiconductor refrigeration chip 200 to operate at maximum power when the battery temperature is between the maximum normal battery temperature value and the temperature threshold, and to control the semiconductor refrigeration chip 200 to operate at reduced power when the battery temperature is between the temperature threshold and the minimum normal battery temperature value.

[0058] Preferably, in this embodiment, when the battery temperature is between the temperature threshold and the minimum normal battery temperature value, the PID algorithm is used to control the semiconductor refrigeration plate 200 to reduce power operation to ensure that the battery temperature remains unchanged.

[0059] Further as a preferred implementation, in this embodiment, the setting module is also used to set a second constant value;

[0060] The main controller also includes:

[0061] a calculation module, configured to calculate a difference between the ambient temperature and the maximum normal battery temperature value when the ambient temperature is between the maximum normal battery temperature value and the minimum normal battery temperature value;

[0062] A start-up module is used to disable the cooling external circulation mode and the cooling internal circulation mode when the difference is greater than the second constant value, and to control the power control module to perform corresponding operations when the difference is less than the second constant value.

[0063] This embodiment starts the cooling mode according to the ambient temperature. If the ambient temperature is greater than the maximum normal battery temperature, the cooling mode must be started in this embodiment. When the ambient temperature is between the maximum normal battery temperature and the minimum normal battery temperature, it proves that the battery temperature is also between the maximum normal battery temperature and the minimum normal battery temperature. At this time, this embodiment needs to judge whether to start the cooling mode according to the actual situation. If the difference between the ambient temperature and the maximum normal battery temperature is greater than the second constant value, it proves that the battery temperature is relatively low at this time. Even if the battery starts charging and discharging, the battery temperature is within the normal battery temperature range for a short time and will not affect the use of the battery. If the difference between the ambient temperature and the maximum normal battery temperature is greater than the second constant value, it proves that the battery temperature is relatively high at this time. After the battery starts charging and discharging, the battery temperature will rise rapidly and the cooling mode needs to be started to avoid affecting the battery.

[0064] Further as a preferred implementation, in this embodiment, the setting module is also used to set a battery thermal runaway temperature threshold;

[0065] The main controller also includes:

[0066] A second comparison module, used for comparing the battery temperature with the battery thermal runaway temperature threshold;

[0067] The alarm module is used to control the battery to stop charging and discharging when the battery temperature reaches the battery thermal runaway temperature threshold, and to control the semiconductor cooling plate 200 to operate at maximum power, while outputting an alarm signal until the battery temperature drops below the maximum normal battery temperature value.

[0068] As a further preferred implementation, in this embodiment, the main controller further includes:

[0069] The first interrupt module is used to control the semiconductor refrigeration plate 200 to stop being powered on and to control the internal fan and the external fan to start at the same time, if it is detected that the battery stops charging and discharging when operating in the cooling external circulation mode or the cooling internal circulation mode, until the battery temperature drops to the maximum normal battery temperature value.

[0070] In this embodiment, the power saving effect of the system is effectively improved by setting the first interrupt module.

[0071] As a further preferred implementation, in this embodiment, the temperature sensor 600 further includes detecting the temperature of the inner heat sink, and the setting module is further used to set a third constant value, and the difference between the ambient temperature and the third constant value is defined as a condensation threshold;

[0072] The main controller also includes:

[0073] A third comparison module, used for comparing the internal radiator temperature with the condensation threshold;

[0074] The second interruption module is used to control the semiconductor refrigeration chip 200 to stop being powered on when the temperature of the inner heat sink is lower than the condensation threshold.

[0075] In this embodiment, the above-mentioned setting can effectively avoid the risk of condensation of water in the battery pack 100. When the temperature of the internal heat sink is lower than the condensation threshold, it proves that the temperature of the internal heat sink is much lower than the ambient temperature. There is a risk of condensation of water on the internal heat sink 400. In order to avoid the risk of electricity consumption, it is necessary to control the semiconductor refrigeration chip 200 to stop powering on.

[0076] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. All equivalent structural changes made using the contents of the present invention's specification and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A battery pack temperature control system, characterized in that: A battery pack is provided, wherein a plurality of controllable flaps are provided on the surface of the battery pack, a plurality of batteries are installed in the battery pack, an air duct is provided outside the battery, a plurality of heat dissipation areas are provided on one side of the battery pack, a semiconductor cooling sheet is inlaid in the heat dissipation area, heat dissipation fins are provided on the inner side and the outer side of the semiconductor cooling sheet respectively, the heat dissipation fins on the inner side of the semiconductor cooling sheet are defined as inner heat dissipation fins, the heat dissipation fins on the outer side of the semiconductor cooling sheet are defined as outer heat dissipation fins, an outer fan is installed on the outer side of the outer heat dissipation fins, an inner fan is installed on the inner side of the inner heat dissipation fins, and temperature sensors are installed at multiple positions inside and outside the battery pack respectively; The battery pack temperature control system further includes a main controller, which is respectively connected to each of the temperature sensors, each of the semiconductor cooling sheets, each of the internal fans, each of the external fans, and each of the controllable flaps; The main controller is configured to select and enable a cooling internal circulation mode or a cooling external circulation mode according to the detection data of each of the temperature sensors; In the cooling internal circulation mode, the main controller controls the internal fan and the external fan to start at the same time, controls the inner side of the semiconductor refrigeration plate as the cold end and the outer side as the hot end, and controls the controllable flap to close to avoid air convection between the inside and the outside of the battery pack; The cooling external circulation mode is that the main controller controls the start-up of the inner fan and the outer fan at the same time, controls the inner side of the semiconductor refrigeration plate as the cold end and the outer side as the hot end, and controls the controllable flap to open so that air convection is generated between the inside and the outside of the battery pack.

2. A battery pack temperature control system according to claim 1, characterized in that: The temperature sensor detects the ambient temperature and the temperature inside the battery pack at a side away from the heat dissipation area; The main controller comprises: Setting module, used to set the maximum normal battery temperature value; A first comparison module, used for comparing the ambient temperature with the maximum normal battery temperature value, and comparing the cavity temperature with the ambient temperature; The mode selection module is used to start the cooling external circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is greater than the ambient temperature, and to start the cooling internal circulation mode when the ambient temperature is greater than the maximum normal battery temperature value and the cavity temperature is less than the ambient temperature.

3. A battery pack temperature control system according to claim 2, characterized in that: The setting module is also used to set a minimum normal battery temperature value, the first comparison module is also used to compare the ambient temperature with the minimum normal battery temperature value, and the mode selection module is also used to start the heating internal circulation mode when the ambient temperature is lower than the minimum normal battery temperature value. The heating internal circulation mode is that the main controller controls the start of the internal fan, controls the inner side of the semiconductor refrigeration plate as the hot end and the outer side as the cold end, and controls the controllable flap to close to avoid air convection between the inside and the outside of the battery pack.

4. A battery pack temperature control system according to claim 2, characterized in that: The temperature sensor detects the battery temperature, and the setting module is further used to set a first constant value, and the difference between the maximum normal battery temperature value and the first constant value is defined as a temperature threshold; The main controller also includes: The power control module is used to control the semiconductor refrigeration chip to operate at maximum power when the battery temperature is between the maximum normal battery temperature value and the temperature threshold, and to control the semiconductor refrigeration chip to operate at reduced power when the battery temperature is between the temperature threshold and the minimum normal battery temperature value.

5. A battery pack temperature control system according to claim 4, characterized in that: The setting module is also used to set a second constant value; The main controller also includes: a calculation module, configured to calculate a difference between the ambient temperature and the maximum normal battery temperature value when the ambient temperature is between the maximum normal battery temperature value and the minimum normal battery temperature value; A start-up module is used to disable the cooling external circulation mode and the cooling internal circulation mode when the difference is greater than the second constant value, and to control the power control module to perform corresponding operations when the difference is less than the second constant value.

6. A battery pack temperature control system according to claim 4, characterized in that: The setting module is also used to set the battery thermal runaway temperature threshold; The main controller also includes: A second comparison module, used for comparing the battery temperature with the battery thermal runaway temperature threshold; The alarm module is used to control the battery to stop charging and discharging when the battery temperature reaches the battery thermal runaway temperature threshold, and to control the semiconductor cooling chip to operate at maximum power, while outputting an alarm signal until the battery temperature drops below the maximum normal battery temperature value.

7. A battery pack temperature control system according to claim 4, characterized in that: The main controller also includes: The first interrupt module is used to control the semiconductor refrigeration plate to stop being powered on, and to control the internal fan and the external fan to start, if it is detected that the battery stops charging and discharging when operating in the cooling external circulation mode or the cooling internal circulation mode, until the battery temperature drops to the maximum normal battery temperature value.

8. A battery pack temperature control system according to claim 4, characterized in that: The temperature sensor also includes a detection module for detecting the temperature of the inner heat sink, and the setting module is further used to set a third constant value, and the difference between the ambient temperature and the third constant value is defined as a condensation threshold value; The main controller also includes: A third comparison module, used for comparing the internal radiator temperature with the condensation threshold; The second interruption module is used to control the semiconductor refrigeration plate to stop being powered on when the temperature of the inner heat sink is lower than the condensation threshold.

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