Square lithium thionyl chloride battery pack for wide-mechanics high-safety bullet

Abstract

The invention discloses a wide-mechanics high-safety square lithium thionyl chloride battery pack for bombs, which is characterized in that a corrosion-resistant fluorine-based limiting gasket is designed, so that a positive plate and a negative plate are prevented from shifting in a large-mechanics space environment, a short-circuit phenomenon of a single battery is avoided, and even a safety problem is avoided. Heat-conducting silica gel pads are designed at the bottoms of the battery cells, so that heat is transferred to a battery pack shell in time, and single heat accumulation in the battery pack is avoided; a thermistor is designed in the cell stack to monitor the temperature of the cell in real time, so that the working temperature of the cell is safe and controllable; reliable connection of single bodies in the battery pack can be achieved by designing the double-wire parallel high-temperature wires, even if a power supply loop is short-circuited, the series wires can be fused due to the limitation of a wire overcurrent threshold value, and the safety problem caused by thermal runaway of the batteries due to long-time short circuit of the batteries is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of batteries, and particularly relates to a square lithium thionyl chloride battery pack for wide mechanics and high safety ammunition. Background Art

[0002] Lithium thionyl chloride batteries have the advantages of high specific energy, stable working voltage, wide working temperature range, and maintenance-free, etc., and have been widely used in military fields such as intelligent mines, intelligent anti-aircraft guns, jammers, and torpedoes in China, as well as civilian fields such as instruments and meters, communication equipment, positioning devices, and life-saving equipment.

[0003] High-performance electrolytic salt preparation technology and the application technology of phthalocyanine metal electrolyte additives, etc., can reduce the ionic charge transfer resistance and improve the rate performance of the battery. However, the metal ion compounds generated during the reaction will block the porous carbon cathode, affecting the further reaction of the active substances, resulting in the attenuation of the battery capacity performance; lithium boron alloy composite metal thionyl chloride batteries reduce the content of metallic lithium active substances, reduce the anode active substances, reduce the specific energy of the battery, and the battery cost increases significantly; the PI separator has a large thickness, which will reduce the specific energy of the battery by 15% - 25%. Although it improves the safety of the battery, it is not conducive to rate discharge; the application of temperature-sensitive components such as PTC or fuses can improve the safety of the battery, but the components have reliability problems and are difficult to be popularized and applied in the aerospace field with high reliability requirements.

[0004] Chinese invention patent with the publication number of CN102881948B discloses a square lithium ion battery, which adopts a cylindrical winding type core. The pole piece gap and tightness are uniform, and the production efficiency is high; the core auxiliary module can support and protect the core, improving the mechanical strength and safety of a new type of square battery. Increasing the number of core units can increase the capacity of the battery. The positive and negative current collectors do not contact the shell, and the battery shell is not charged, improving the safety of use. The capacity of the battery can be increased by the number of core units, and this technical solution is not applicable to the type of battery proposed by the present invention.

[0005] At present, the relatively mature domestic lithium thionyl chloride batteries are mostly wound cylindrical lithium thionyl chloride batteries. This type of battery has strong mechanical adaptability, but the discharge rate is less than 0.01C, and it is difficult to meet the power consumption requirements of special equipment in China. Summary of the Invention

[0006] In order to solve the above problems, the present invention aims to provide a square lithium thionyl chloride battery pack for wide mechanics and high safety ammunition.

[0007] To achieve the above object, the present invention adopts the following technical solutions: A square lithium thionyl chloride battery pack for a wide mechanical and high-safety bullet, comprising a battery pack housing and a plurality of battery cells disposed within the battery pack housing. Each battery cell includes a battery core and a housing. The battery core includes a positive electrode plate, a negative electrode plate, and a separator located between the positive electrode plate and the negative electrode plate. Corrosion-resistant fluorine-based limiting gaskets and heat-conducting silica gel pads are respectively disposed above and below the battery core. The separator has a thickness of 0.12 mm to 0.15 mm and is composed of a modified fluorine-based material and glass fiber.

[0008] Further, a limiting gasket cylinder is also disposed within the battery cell to prevent the positive and negative electrode plates from shifting.

[0009] Further, the battery pack uses a plurality of tab current collectors for extraction.

[0010] Further, the heat-conducting silica gel pad has a thickness of 0.5 to 3.0 mm.

[0011] Further, a thermistor is disposed above each battery cell.

[0012] Further, the battery cells are connected in series by wires.

[0013] Further, the wire is a double-wire parallel high-temperature wire.

[0014] Further, the battery cell is a lithium thionyl chloride laminated square battery.

[0015] Compared with the prior art, the present invention has the following advantages: The battery pack can maintain the discharge electrical performance at a 0.2C rate, ensuring the safety and controllability of the battery operating temperature. A corrosion-resistant fluorine-based limiting gasket is designed above the battery core, so that the positive and negative electrode plates will not shift in a large mechanical space environment, resulting in a short circuit of the single battery and even bringing safety problems. A heat-conducting silica gel pad is designed at the bottom of the battery core to transfer heat to the battery pack housing in time, avoiding the accumulation of heat of the single cells inside the battery pack; by designing a thermistor inside the battery stack to monitor the battery temperature in real time, the safety and controllability of the battery operating temperature are further ensured; by designing a double-wire parallel high-temperature wire, reliable connection of the single cells inside the battery pack can be achieved. Even if a short circuit occurs in the power supply circuit, the series wire will fuse due to the wire overcurrent threshold limit, avoiding the safety problem caused by the thermal runaway of the battery due to long-term short circuit of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 Schematic structural diagram of a wide-mechanics and high-safety square lithium thionyl chloride battery pack in the present invention;

[0018] Figure 2 is Figure 1 cross-sectional view;

[0019] Figure 3 Three-dimensional structural diagram of a limiting gasket column body provided for a battery cell;

[0020] Figure 4 is Figure 3 top view;

[0021] In the figure, 1 - battery cell; 2 - limiting gasket; 3 - thermally conductive silicone gasket; 4 - battery pack housing; 5 - thermistor; wire - 6; 2.1 - limiting gasket column body; 2.2 - limiting groove. Specific embodiments

[0022] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but it should not be understood that the scope of the subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, all modifications, substitutions, and changes made according to ordinary technical knowledge and customary means in the art are included in the scope of the present invention.

[0023] Referring to Figures 1-2 , a laminated square lithium thionyl chloride battery structure with multiple tab current collectors is adopted. By designing a modified fluorine-based material and glass fiber composite diaphragm with a thickness of about 0.12 - 0.15 mm, the 0.2C rate continuous discharge electrical performance and safety performance of the single battery are ensured;

[0024] A corrosion-resistant fluorine-based limiting gasket 2 is designed above the battery core. The connection with the single battery cover is realized through the limiting groove 1. A limiting gasket column body 2.1 is provided above the electrode group, so that the positive and negative plates will not be displaced in a large-mechanics space environment, resulting in a short-circuit phenomenon in the single battery and even bringing safety problems.

[0025] To ensure that the single batteries inside the battery pack do not show uneven heating during continuous discharge at a rate of 0.2C, and even the heat of individual single batteries does not accumulate significantly, a thermally conductive silicone gasket 3 with a thickness of 0.5 - 3.0 mm is designed at the bottom of the battery to transfer heat to the battery pack housing 4 in time;

[0026] To further ensure the safety and controllability of the internal temperature of the battery, a thermistor 5 is designed to monitor the internal temperature of the battery stack in real time;

[0027] By designing a 0.35 - 1.0 mm² double - wire parallel high - temperature wire 6 to achieve the series connection of single cells inside the battery pack, it can meet the reliable connection requirements of the power supply circuit of aerospace products. When there is a short - circuit situation in the power supply circuit, the series - connected wire will fuse due to the wire over - current threshold limit, avoiding safety problems caused by battery thermal runaway due to long - term battery short - circuit.

[0028] Embodiment 1: As Figures 3-4 shown, a corrosion - resistant fluorine - based limit gasket 2 is designed above the single - cell core. The connection with the single - cell cover plate is achieved through the limit groove 2.2, and the limit gasket column 2.1 is above the electrode group. This prevents the positive and negative plates from shifting in a large - mechanical - stress space environment. When adding electrolyte, the uniform distribution of the electrolyte inside the single cell is realized through the liquid inlet channel, which not only ensures the electrical performance of the single - cell battery but also improves the mechanical adaptability of the single - cell battery.

[0029] Embodiment 2: As Figures 1-2 shown, a thermal - conductive silicone pad 3 is designed at the bottom of the single - cell battery 1 to ensure that the single cells inside the battery pack continuously discharge at a rate of 0.2C, and timely transfer the heat to the battery - pack shell 4, preventing uneven heat generation inside the battery pack; by designing a double - wire parallel high - temperature wire 2 to achieve a reliable power - supply connection for the single cells inside the battery pack. When there is a short - circuit situation in the power supply circuit, the series - connected wire will fuse due to the wire over - current threshold limit, avoiding safety problems caused by battery thermal runaway due to long - term battery short - circuit; by designing a thermistor 5 inside the battery stack, the temperature inside the battery stack can be monitored in real time, further ensuring the safety and controllability of the battery internal temperature.

[0030] A wide - mechanical - range and high - safety square lithium thionyl chloride battery pack of the present invention adopts a stacked - plate square lithium thionyl chloride battery structure with multiple tab current collectors. Through a modified fluorine - based material and glass - fiber composite separator, it ensures the electrical performance and safety performance of the single - cell battery during continuous discharge at a rate of 0.2C; a corrosion - resistant fluorine - based limit gasket is designed above the cell core to prevent the positive and negative plates from shifting in a large - mechanical - stress space environment, resulting in a short - circuit phenomenon in the single - cell battery and even bringing safety problems. A thermal - conductive silicone pad is designed at the bottom of the battery to timely transfer the heat to the battery - pack shell, avoiding heat accumulation of the single cells inside the battery pack; by designing a thermistor inside the battery stack to monitor the battery temperature in real time, further ensuring the safety and controllability of the battery operating temperature; by designing a double - wire parallel high - temperature wire, a reliable connection of the single cells inside the battery pack can be achieved. Even when there is a short - circuit situation in the power supply circuit, the series - connected wire will fuse due to the wire over - current threshold limit, avoiding safety problems caused by battery thermal runaway due to long - term battery short - circuit.

[0031] The lithium thionyl chloride battery pack developed by adopting the above technical solution has been actually applied in a certain type of strategic weapon system in our country, improving the reliability and safety of battery use, significantly enhancing the performance of the equipment power supply system, indirectly promoting the upgrading of our country's equipment system, and is expected to be popularized and applied in other new weapon systems.

[0032] The above has introduced in detail a wide-mechanics and high-safety square lithium thionyl chloride battery pack for projectiles provided by the present invention. Specific examples are used in this article to expound the structure and working principle of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can still be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A square lithium thionyl chloride battery pack for a wide-mechanics and high-safety bullet, comprising a battery pack housing (4) and a plurality of battery cells (1) disposed within the battery pack housing (4), the battery cell (1) including an electrode assembly and a housing, the electrode assembly including a positive electrode plate, a negative electrode plate, and a separator located between the positive electrode plate and the negative electrode plate, characterized in that: Above and below the battery cell, a corrosion-resistant fluorine-based limiting gasket (2) and a heat-conducting silicone gasket (3) are respectively arranged. The thickness of the separator is 0.12 mm to 0.15 mm and it is composed of a modified fluorine-based material and glass fiber.

2. The square lithium thionyl chloride battery pack for wide mechanics and high safety bullets according to claim 1, characterized in that: In the battery cell (1), a limiting gasket column (2.1) is also arranged to prevent the positive and negative plates from shifting.

3. The square lithium thionyl chloride battery pack for wide mechanical high safety bullets according to claim 1, characterized in that: The battery pack uses multiple tab current collectors for extraction.

4. The square lithium thionyl chloride battery pack for wide mechanics and high safety bullet according to claim 1, characterized in that: The thickness of the heat-conducting silicone gasket (3) is 0.5 to 3.0 mm.

5. The square lithium thionyl chloride battery pack for wide mechanical high safety bullets according to claim 1, characterized in that: A thermistor (5) is arranged above each battery cell (1).

6. The square lithium thionyl chloride battery pack for wide mechanics and high safety bullet according to claim 1, characterized in that: The battery cells (1) are connected in series through wires (6).

7. The square lithium thionyl chloride battery pack for wide mechanics and high safety bullet according to claim 6, characterized in that: The wire (6) is a double-wire parallel high-temperature wire.

8. The square lithium thionyl chloride battery pack for wide mechanical property and high safety bullet as claimed in claim 1, wherein: The battery cell (1) is a lithium thionyl chloride laminated square battery.

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