Lithium-ion battery heat insulation device and control method thereof

[0047] First embodiment

[0048] Figure 1~2 The first embodiment of the present invention is shown. The lithium battery heat preservation device in this embodiment includes an insulating housing 1 for placing lithium batteries, a heat preservation box 2 provided in the insulating housing 1, and a heat preservation box 2 The temperature control circuit of the lithium battery and the temperature adjustment device 3 is also provided in the insulating housing 1. The temperature control circuit is powered by the lithium battery and used to automatically control the ambient temperature of the lithium battery.

[0049] The insulating housing 1 is a box made of insulating material that plays a protective and supporting role. Preferably, the box material is a material with good heat insulation effect, high strength, and good insulation performance, such as plastic, Plastic, resin, etc. The box body/insulation box 1 is further provided with a heat insulation box 2, and the temperature adjustment device 3 is arranged on the inner surface of the box body of the heat insulation box 2.

[0050] The temperature control circuit includes a temperature detection module Rt, a temperature control automatic switch module Kt and a temperature adjustment device R. The temperature detection module Rt is connected to the temperature control automatic switch module Kt, and the temperature control automatic switch module Kt is connected to the The temperature regulating device R is connected in series.

[0051] The temperature control circuit also includes a manual master switch SW connected in series in the circuit and an indicator light 6 for indicating the working state of the circuit. The indicator light can be an LED indicator light, or other types of indicator light.

[0052] The temperature control circuit is integrated with the protection circuit board 5 of the lithium battery, and the protection circuit board 5 is placed on the cell 4 of the lithium battery.

[0053] The cover of the insulating box 1 is provided with a through hole for the manual main switch SW, the indicator light 6 and the power output line 7 to pass through.

[0054] The temperature regulating device 3 can be a thermoelectric cooling plate, and the hot spot cooling plate also becomes a semiconductor cooling plate. Its working operation uses direct current, which can be used for both cooling and heating. The polarity of the direct current is changed to determine the same cooling On-chip cooling or heating is achieved, and this effect is produced by thermoelectric cooling. The working principle of the hot spot refrigeration film/semiconductor refrigeration film is: when a piece of N-type semiconductor material and a piece of P-type semiconductor material are connected to form a galvanic pair, after the direct current is connected in this circuit, energy transfer can occur, and the current is The N-type element flows to the joint of the P-type element to absorb heat and becomes the cold end. The P-type element flows to the joint of the N-type element to release heat and becomes the hot end. The magnitude of heat absorption and heat release is determined by the magnitude of the current and the number of pairs of semiconductor materials N and P elements. image 3 It is a refrigeration sheet, which is composed of two sets of ceramic sheets, between which there are N-type and P-type semiconductor materials (bismuth telluride). This semiconductor element is connected in series in the circuit.

[0055] Second embodiment

[0056] The second embodiment of the present invention provides a lithium battery heat preservation method. The method uses the lithium battery heat preservation device in the first embodiment. When the lithium battery or lithium battery pack needs to be used in an extreme temperature environment, the insulating housing 1 is first opened The manual master switch SW on the lid of the box makes the temperature control circuit work, and the LED indicator lights up at this time; then set the temperature limit point of the temperature control automatic switch module Kt, the temperature limit point can be set to one or more, For example, set to 5°C and 30°C, where 5°C to 30°C is the normal operating temperature.

[0057] When the temperature detection module Rt detects that the temperature of the lithium battery is higher than 30°C, the temperature control automatic switch module Kt automatically controls the thermoelectric cooling fins in the temperature control device 3 in the temperature control circuit to start working, and output heat to the outside, that is, heat dissipation. So as to reduce the ambient temperature around the lithium battery;

[0058] When the temperature detection module Rt detects that the temperature of the lithium battery is lower than 5℃, the temperature control automatic switch module Kt automatically turns on the temperature control circuit, and the temperature control automatic switch module Kt controls the temperature control circuit. At this time, the temperature control in the temperature control circuit The thermoelectric cooling plate in the device 3 is energized to generate heat and absorb heat from the outside, thereby increasing the ambient temperature around the lithium battery;

[0059] When the temperature detection module Rt detects that the ambient temperature of the lithium battery is between 5°C and 30°C, the temperature control automatic switch module Kt disconnects the temperature control circuit, and the electric heating and cooling fins in the temperature adjustment device 3 are in a dormant state. In this way, even if the ambient temperature of the lithium battery is always maintained between 5°C and 30°C.

[0060] When the user does not need to use the temperature adjustment function, turn off the manual main switch SW on the cover of the insulating housing 1 to stop the temperature control circuit, and the LED indicator light is off at this time.

[0061] The third embodiment

[0062] The second embodiment of the present invention provides a lithium battery heat preservation method. The method uses the lithium battery heat preservation device in the first embodiment. The method temperature limit points can be set to more, for example, the first low temperature threshold is 5°C. In addition to the second low temperature threshold of 0°C, the first high temperature threshold of 30°C, and the second high temperature threshold of 35°C, a comparator and a control chip are also provided in the temperature control circuit. When the manual switch SW on the cover of the insulating box 1 is opened, the temperature control circuit starts to work, and the LED indicator lights up at this time; when the temperature detection module Rt detects that the temperature of the lithium battery is higher than the first high temperature threshold 30°C, The temperature control automatic switch module Kt automatically controls the thermoelectric cooling fins in the temperature control device 3 in the temperature control circuit to start working, outputting heat to the outside, that is, heat dissipation, and its power is the first heat dissipation power;

[0063] When the temperature detection module Rt detects that the temperature of the lithium battery is higher than the second high temperature threshold of 35°C, the temperature control automatic switch module Kt automatically controls the thermoelectric cooling plate in the temperature control device 3 in the temperature control circuit to start working with a larger current , Output heat to the outside, that is, heat dissipation, the power is the second heat dissipation power, and the second heat dissipation power is greater than the first heat dissipation power.

[0064] When the temperature detection module Rt detects that the temperature of the lithium battery is lower than the first low temperature threshold 5°C, the temperature control automatic switch module Kt automatically turns on the temperature control circuit, and the temperature control automatic switch module Kt controls the temperature control circuit. At this time, the temperature control circuit The thermoelectric refrigeration sheet in the temperature adjustment device 3 in the temperature control device 3 is energized to generate heat and absorb heat from the outside, so that the ambient temperature around the lithium battery rises, that is, heat absorption, and its power is the first heating power;

[0065] When the temperature detection module Rt detects that the temperature of the lithium battery is lower than the second low temperature threshold 0°C, the temperature control automatic switch module Kt controls the temperature control circuit. At this time, the thermoelectric cooling sheet in the temperature control device 3 in the temperature control circuit is energized and heated , Absorbing external heat, thereby increasing the ambient temperature around the lithium battery, that is, absorbing heat, and its power is the second heat absorbing power, which is greater than the first heating power.

[0066] When the temperature detection module Rt detects that the ambient temperature of the lithium battery is between 5°C and 30°C, the temperature control automatic switch module Kt disconnects the temperature control circuit, and the electric heating and cooling fins in the temperature adjustment device 3 are in a dormant state. In this way, even if the ambient temperature of the lithium battery is always maintained between 5°C and 30°C. When the user does not need to use the temperature adjustment function, turn off the manual main switch SW on the cover of the insulating housing 1 to stop the temperature control circuit, and the LED indicator light is off at this time.