Emergency battery pack used in high-cold environment

Abstract

The application discloses an emergency battery group used in high-cold environment, which comprises a shell, an insulating layer, a lithium sulfur dioxide battery group arranged in the shell, an automatic activation voltage stabilizing circuit, and the automatic activation voltage stabilizing circuit is arranged at one end of the shell and in the shell. The shell provides mechanical strength and certain heat preservation performance for the battery group; the insulating layer collects slight heat generated by the battery during working, which is beneficial to continuous working of the battery; the voltage stabilizing part ensures stability of voltage output and avoids unstable output voltage; and the activation part avoids the hysteresis phenomenon of the lithium sulfur dioxide battery group after long-term storage and cannot supply power to the voltage stabilizing component.

Description

Technical Field

[0001] This invention relates to the field of lithium batteries, and more specifically to an emergency battery pack for use in extremely cold environments. Background Technology

[0002] The supply of power for use in high-altitude and frigid environments has always been a difficult problem to solve in such environments (mountaineering, fieldwork, military). In high-altitude and frigid environments, there is a lack of energy replenishment, making it impossible to recharge secondary batteries. Furthermore, the low-temperature characteristics of secondary batteries mean they cannot release most of their energy in such environments, only providing a small, sustaining current output. Moreover, secondary batteries have a high self-discharge rate, typically losing about 15% of their energy annually. Therefore, designing a maintenance-free emergency battery pack suitable for long-term storage and on-demand use is essential. Summary of the Invention

[0003] The purpose of this invention is to provide an emergency battery pack for use in extremely cold environments. This battery pack can output 75% of its rated energy at -40℃. It can maintain more than 90% of its energy within 5 years without maintenance, making it suitable for emergency use in extremely cold environments.

[0004] To achieve the above technical objectives, the present invention adopts the following technical solution:

[0005] An emergency battery pack for use in extremely cold environments includes a housing, an insulation layer, a lithium sulfur dioxide battery pack disposed inside the housing, and an automatic activation voltage regulator circuit, wherein the automatic activation voltage regulator circuit is located at one end of the housing and is disposed inside the housing.

[0006] Furthermore, the lithium sulfur dioxide battery pack uses eight battery cells in a four-series, two-parallel design.

[0007] Furthermore, the battery is a cylindrical primary battery with a wound-type internal electrode structure.

[0008] Furthermore, the positive and negative leads of the battery are insulated by a metal-glass-metal encapsulation, forming a fully sealed structure.

[0009] Furthermore, the steel casing of the battery is made of cold-rolled nickel-plated steel sheet.

[0010] Furthermore, the operating temperature range of the battery is -55℃ to +65℃.

[0011] Furthermore, the insulation layer is EVA cotton.

[0012] Furthermore, the automatic activation voltage regulator circuit includes connecting wires, LED indicator lights, activation and voltage regulation parts, a switch, a USB interface, and connecting wires, positive and negative terminals, and the positive and negative terminals of the battery pack, respectively.

[0013] Furthermore, the housing is sealed by snap-fit ​​or ultrasonic welding.

[0014] Furthermore, the USB interface can be connected to electrical appliances such as heated vests or emergency communication devices.

[0015] Compared with similar existing technologies, the present invention has the following technical advantages:

[0016] (1) The present invention uses ultra-low temperature lithium sulfur dioxide battery cells as the energy source.

[0017] (2) The lithium sulfur dioxide battery cell of the present invention is designed with electro-hydraulic purification process to ensure low hysteresis and low capacity reduction rate.

[0018] (3) The present invention uses an EVA cotton insulation layer to increase the stability of its discharge.

[0019] (4) This invention uses an automatic activation circuit and a 5V DC-DC step-down circuit, and a voltage regulation output circuit to ensure the stability of its output voltage. The step-down chip may be ETA2893, WD5030, SG1524, MP1495S, SL1581 or similar DC-DC step-down chips.

[0020] (5) The present invention designs a switch in which, when the switch is turned on, the battery pack is directly activated by discharging through the power resistor set on the automatic activation voltage regulator board. After activation, the battery pack can output a constant voltage through the voltage regulation output circuit, ensuring that the battery pack is always in an output-ready state.

[0021] (6) The convenient USB interface design of this invention enables it to connect to electric heating vests and other emergency electrical equipment.

[0022] (7) The casing of the present invention provides mechanical strength and certain heat preservation performance for the battery pack; the heat insulation layer collects the slight heat generated by the battery during operation, which is conducive to the battery continuing to work; the voltage stabilization part ensures the stability of voltage output and avoids voltage fluctuation of electrical appliances; the activation part avoids the hysteresis phenomenon that exists after the lithium sulfur dioxide battery pack is stored for a long time and cannot supply power to the voltage stabilization component. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the emergency battery pack for use in extremely cold environments according to the present invention;

[0024] Figure 2 To activate part of the circuit diagram;

[0025] Figure 3 This is the circuit diagram for the voltage regulator section;

[0026] Figure 4For a high-quality battery, after the resistor is connected, the battery can quickly recover to above the activation voltage V_Threshold threshold within t_min time. U1 determines that the battery has no passivation and controls Q2 to be cut off. (Related diagram).

[0027] Figure 5 The t_min time after the battery is connected to the resistor is slightly lagging. When the battery voltage drops below the threshold voltage V_Threshold, U1 determines that the battery has passivation.

[0028] Figure 6 The t_min time after the battery is connected to the resistor is the deep hysteresis time. When the battery voltage drops below the threshold voltage V_Threshold, U1 determines that the battery has passivation.

[0029] Figure 7 The diagram shows how U1 determines that battery activation has failed, controls Q2 to turn off, and the activation circuit stops working. Detailed Implementation

[0030] like Figure 1 As shown, an emergency battery pack for use in extremely cold environments includes a casing, an insulation layer, a lithium sulfur dioxide battery pack disposed inside the casing, and an automatic activation voltage regulator circuit.

[0031] The lithium sulfur dioxide battery pack uses eight battery cells in a four-series, two-parallel design, connected in a row and covered with EVA cotton as a heat insulation layer before being placed inside the casing. The automatic activation voltage regulator circuit includes connecting wires, LED indicator lights, and an activation section (see...). Figure 2 ) and voltage stabilization section (see Figure 3 It consists of a switch and a USB interface. The automatic activation voltage regulator circuit is located at one end of the casing, and the connecting wires and positive and negative terminals are connected to the positive and negative terminals of the battery pack, respectively. The casing is sealed by snap-fit ​​or ultrasonic welding.

[0032] The battery is a cylindrical primary battery with a wound internal electrode structure. The negative electrode active material is metallic lithium, and the positive electrode active material is liquid sulfur dioxide. The positive and negative electrode leads are insulated by a metal-glass-metal encapsulation, forming a fully sealed structure. The casing is made of cold-rolled nickel-plated steel sheet. The battery's operating temperature range is -55℃ to +65℃.

[0033] The USB interface can be used to connect electric heating vests or emergency communication devices.

[0034] Automatic activation voltage regulator circuit schematic diagram explanation:

[0035] 1. Automatic detection function: The power board can automatically detect whether the battery is passivated when the power is turned on.

[0036] 2. Activation at 0V voltage: When activating the passivated battery, the power board can still work reliably even when the activation voltage is as low as 0V.

[0037] III. Control Points: Important control points and parameters of the power board include

[0038] 1. Activate the threshold voltage V_Threshold, which is set by the low-power three-terminal voltage comparator IC: U1.

[0039] 2. The minimum activation and testing time t_min is set by the C3 charging time.

[0040] 3. The maximum activation limit time t_max is set by the discharge time of C1 and C2.

[0041] IV. Control Principle:

[0042] The control points V_Threshold t_min t_max construct a rectangular threshold activation working region, controlling the battery under different operating conditions within this range.

[0043] When the switch is in the OFF position, the battery charges C1 and C2 as backup power for the power board.

[0044] When the switch is in the ON position, Q2 conducts first, connecting the activation / test resistors R1 to R8 to the battery terminal:

[0045] 1. A high-quality battery can quickly recover to above the activation voltage V_Threshold threshold within t_min after the resistor is connected. U1 determines that the battery has no passivation and controls Q2 to be cut off. Figure 4 .

[0046] The system quickly switches to normal operating mode, and the ETA2893 U1 DC-DC5V circuit operates, providing a stable DC5V power supply to the user's load.

[0047] 2. If, within t_min after the battery is connected to the resistor (mild or deep hysteresis), the battery voltage drops below the threshold voltage V_Threshold, U1 determines that the battery has passivation. Figure 5 , Figure 6 .

[0048] The activation resistor continues to operate until the maximum activation limit time t_max. If the passivated cell can be activated within the time period t_min to t_max, and its voltage is higher than the threshold voltage V_Threshold, then...

[0049] U1 determines that battery activation is complete and controls Q2 to turn off. It then switches to normal operating mode, and the ETA2893 U1 DC-DC5V circuit operates, providing a stable DC5V power supply to the user load.

[0050] 3. If, within the time t_min after the deeply hysteresis-inactive battery is connected to the resistor, the battery voltage drops below the threshold voltage V_Threshold, U1 determines that the battery has passivation.

[0051] U1 controls the activation resistor to continue operating until the maximum activation limit time t_max. If the passivated cell cannot be activated within the time period t_min to t_max, and its voltage is lower than the threshold voltage V_Threshold, then...

[0052] If U1 determines that battery activation has failed, control Q2 will be cut off, and the circuit board will stop working. Figure 7 .

[0053] Table 1 shows a comparison of the capacity of the new single-cell battery and the storage battery at room temperature and low temperature according to the present invention.

[0054] Table 1 Comparison of the capacity of new single-cell batteries and storage batteries at room temperature and low temperature

[0055]

[0056]

[0057] The single WR18700 cell of this invention has a long storage time; during a 5-year storage period, the energy loss rate does not exceed 10%. It can be activated and used at any time.

[0058] Table 2 shows the comparison of the discharge time and energy of the emergency battery pack and the storage battery at room temperature and low temperature.

[0059] Table 2 Comparison of Discharge Time and Energy of New and Storage Batteries in Emergency Battery Packs at Normal and Low Temperatures

[0060] 4WR18700-2 New Electric 25℃ 10W constant power 5.3h 53Wh 4WR18700-2 New Electric -40℃ 5W constant power 8.2h 41Wh 4WR18700-2 (3 years) 25℃ 10W constant power 4.9h 49Wh 4WR18700-2 (5 years) 25℃ 10W constant power 4.8h 48Wh

[0061] As shown in Table 2, the battery pack of the present invention can output 75% of its rated energy at -40℃ and 75% of its energy in an environment of -40℃; it can maintain more than 90% of its energy within 5 years without maintenance, making it suitable for emergency use in extremely cold environments.

Claims

1. An emergency battery pack for use in extremely cold environments, characterized in that, It includes a housing, a heat insulation layer, a lithium sulfur dioxide battery pack disposed inside the housing, and an automatic activation voltage regulator circuit, which is located at one end of the housing and inside the housing. The lithium sulfur dioxide battery pack uses 8 battery cells in a four-series, two-parallel design. The battery is a cylindrical primary battery with a wound internal electrode structure and sulfur dioxide as the positive electrode active material. The positive and negative terminals of the battery are insulated by a metal-glass-metal encapsulation, forming a fully sealed structure. The insulation layer is EVA cotton; The automatic activation voltage regulator circuit includes connecting wires, LED indicator lights, activation and voltage regulation parts, a switch, a USB interface, and connecting wires, positive and negative terminals, which are respectively connected to the positive and negative terminals of the battery pack.

2. The emergency battery pack for use in extremely cold environments according to claim 1, characterized in that, The battery casing is made of cold-rolled nickel-plated steel sheet.

3. The emergency battery pack for use in extremely cold environments according to claim 1 or 2, characterized in that, The operating temperature range of the battery is -55℃ to +65℃.

4. The emergency battery pack for use in extremely cold environments according to claim 1, characterized in that, The housing is sealed by snap-fit ​​or ultrasonic welding.

5. The emergency battery pack for use in extremely cold environments according to claim 1, characterized in that, The USB interface can be connected to heating vests or emergency communication electrical appliances.

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