Lithium battery separation structure beneficial to thermal insulation

Abstract

The utility model belongs to the technical field of lithium battery modules, and provides a lithium battery separation structure beneficial to heat insulation, which comprises a shell, a sealing cover is assembled at the top end of the shell through bolts, a separation frame is fixedly arranged in the middle of the interior of the shell, and detachable outer protection plates are arranged on the outer surface and the back of the shell; through the ingenious combination of the isolation layer, the electrothermal film and the damping block, the ceramic fiber isolation layer effectively prevents heat transfer and isolates an external low-temperature environment from the battery, and the cooperation of the electrothermal film and the ceramic fiber isolation layer helps to uniformly heat the battery in a cold environment and reduce the influence of low temperature on the performance of the battery, so that the service life of the battery is prolonged. The battery can be accurately positioned through the design of the damping block, and the battery is more stable in the separation frame, so that the problem of battery endurance attenuation at low temperature is solved, and high performance and long cycle life of the battery under different environmental conditions are ensured.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of lithium battery module, and provides a lithium battery separation structure beneficial to temperature insulation. BACKGROUND

[0002] The lithium battery module is a whole unit combined by a plurality of lithium battery monomers (usually single lithium battery) in a specific series-parallel mode. The battery module is a core component in the lithium battery system and is widely used in electric vehicles (EV), energy storage systems, mobile devices and other fields. It not only needs to provide power output, but also needs to have battery management and protection functions to ensure the safety and efficient operation of the system. The separation structure is a very important part in the design of the lithium battery module. Its main function is to ensure the safety, performance, life and overall reliability of the battery.

[0003] The existing lithium battery may be in a low-temperature environment when used in cold seasons or regions. For example, when the temperature drops in winter, outdoor equipment such as electric vehicles may be exposed to cold air, causing the working temperature of the battery to drop. The working principle of lithium-ion battery depends on the chemical reaction inside the battery, i.e. the migration of lithium ions between electrodes. In a low-temperature environment, the rate of these chemical reactions will decrease significantly, which cannot provide enough current output, resulting in a decrease in actual endurance. SUMMARY

[0004] The technical problem to be solved by the application is to overcome the defects of the prior art and solve the problem of endurance decay of the existing lithium battery in a low-temperature environment.

[0005] The technical scheme adopted by the application to solve the technical problem is: a lithium battery separation structure beneficial to temperature insulation, comprising an outer shell, a cover assembled on the top end of the outer shell through bolts, a separation frame fixed in the middle of the inner part of the outer shell, and detachable outer protective plates installed on the outer surface and back of the outer shell.

[0006] The inner part of the separation frame is filled with an isolation layer, and the middle positions of the inner walls of the separation frame at the left and right ends are each installed with an electrothermal film. The upper positions of the inner walls of the separation frame at the left and right ends are each fixed with a damping block.

[0007] The inner side of the outer protective plate is fixed with a plug rod, and the top end of the plug rod is fixed with a plug.

[0008] The outer surface and back of the outer shell and cover are each penetrated by a plurality of ventilation openings corresponding to the plug rod.

[0009] In the preferred technical scheme of the application, the thickness of the isolation layer is two-thirds of the thickness of the separation frame, and the isolation layer is composed of ceramic fibers.

[0010] In the preferable technical scheme of the present application, the electric heating film is divided into four groups, and each group of electric heating film is symmetrically arranged.

[0011] In the preferable technical scheme of the present application, the electric heating film is arranged in a rectangular shape around the periphery, and the outer surface of the electric heating film is arranged in a mesh structure.

[0012] In the preferable technical scheme of the present application, the damping block gradually increases in area from top to bottom, and the damping block is in a circular truncated cone shape and is made of silica gel.

[0013] In the preferable technical scheme of the present application, the length of the plug rod corresponds to the sum of the wall thicknesses of the shell and the cover, the diameter of the plug head is 1-2mm larger than the diameter of the ventilation opening, the plug head is in a circular truncated cone shape and is made of silica gel.

[0014] In the preferable technical scheme of the present application, the four corners of the cover and the partition frame are each penetrated by a threaded hole matched with a bolt.

[0015] Compared with the prior art, the present application has the following beneficial effects:

[0016] Through the ingenious combination of the isolation layer, the electric heating film and the damping block, the ceramic fiber isolation layer effectively prevents the transfer of heat, avoids the thermal runaway situation in the battery module, and isolates the low-temperature environment from the battery, ensuring that the battery can maintain a high working temperature in a low-temperature environment, prolonging the service life of the battery. The cooperation of the electric heating film and the ceramic fiber isolation layer helps to uniformly heat the battery in a cold environment, ensuring that the battery is at an appropriate working temperature, reducing the impact of low temperature on battery performance, improving the cycle life and endurance of the battery. The design of the damping block can accurately position the battery and make the battery more stable in the partition frame, preventing the battery from malfunctioning due to unstable position during use. Not only does it solve the problem of battery endurance degradation in low temperature, but it also ensures high performance and long cycle life of the battery in different environmental conditions.

[0017] Through the ingenious cooperation of the outer protective plate, the plug rod and the plug head, the safety of the battery module in a static state is ensured, and the switching of the heat dissipation function can be easily realized when needed. This design is suitable for battery modules that need to work in different environments, especially in scenarios with large temperature changes, which can effectively prolong the service life of the battery and improve overall performance. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 is the assembly effect diagram of the overall structure of the present application;

[0019] Figure 2 is the assembly effect diagram of the overall structure of the present application;

[0020] Figure 3 is the assembly effect diagram of the cross-sectional structure of the partition frame of the present application;

[0021] Figure 4 For the invention Figure 2 A magnified view of A in the present invention.

[0022] In the figure: 1, shell; 2, cover; 3, partition frame; 301, isolation layer; 302, electric heating film; 303, damping block; 4, outer guard plate; 5, plug rod; 501, plug; 6, ventilation hole. DETAILED DESCRIPTION

[0023] Please refer to Figures 1-4 , the present application provides a technical scheme: a kind of lithium battery partition structure for temperature insulation, including shell 1, shell 1 top end is equipped with cover 2 by bolt, cover 2 and the four corners of partition frame 3 are all penetrated with the threaded hole matched with bolt, when battery module is assembled, cover 2 can be pressed into the top end of shell 1, then it is assembled by bolt insertion cover 2 and the threaded hole of the four corners of partition frame 3 penetration;Shell 1 inside middle is fixed with partition frame 3, partition frame 3 inside middle is filled with isolation layer 301, because battery is separated in partition frame 3, and because the isolation layer 301 filled with ceramic fiber in partition frame 3, the thermal conductivity of ceramic fiber is low, which constitutes the isolation layer between battery, so that battery can effectively isolate heat in high temperature state, avoid heat propagation in battery module, protect battery from thermal runaway and overheating damage, and battery can be isolated from low temperature environment as far as possible;Partition frame 3 inner wall left and right two ends middle position are all installed with electric heating film 302, electric heating film 302 in the middle position of partition frame 3 inner wall left and right two ends can also be uniformly heated to battery by cooperating with isolation layer 301, ensure that battery temperature is not too low in low temperature environment, slow down the influence of low temperature on battery endurance, make battery module practical in long cycle, high performance state, not easy to be disturbed by external environment;Partition frame 3 inner wall left and right two ends upper position are all fixed with damping block 303, when battery is inserted into partition frame 3, user will be obviously resisted, the resistance is generated by several damping blocks 303 with circular truncated cone shape and gradually increasing area from top to bottom, so that battery is positioned after insertion, so that battery module is more stable;Shell 1 outer surface and back are all installed with detachable outer guard plate 4, the inner side of outer guard plate 4 is fixed with plug rod 5, plug rod 5 top end is fixed with plug 501, shell 1 and cover 2 outer surface and back are all penetrated with several ventilation holes 6 corresponding to plug rod 5, when battery module is in normal temperature environment, user can also detach outer guard plate 4 located on the outer surface and back of shell 1, so that plug rod 5 and plug 501 are separated from ventilation hole 6, so that battery module can be in heat dissipation state, which can improve the heat dissipation of battery module.

[0024] The inside of the partition frame 3 is filled with an isolation layer 301, the thickness of the isolation layer 301 is two-thirds of the thickness of the partition frame 3, the isolation layer 301 is composed of ceramic fiber, the middle position of the left and right ends of the inner wall of the partition frame 3 is equipped with an electric heating film 302, and the upper position of the left and right ends of the inner wall of the partition frame 3 is equipped with a damping block 303. The isolation layer 301 is composed of ceramic fiber material, which mainly provides low thermal conductivity. The use of ceramic fiber effectively isolates the heat transfer between the batteries, avoiding the risk of thermal runaway, and ensuring that the battery can isolate heat and reduce the risk of damage at high temperature. The thickness of the isolation layer 301 is two-thirds of the thickness of the partition frame 3, which fully ensures the heat insulation effect.

[0025] The electric heating film 302 is divided into four groups, each group of electric heating film 302 is symmetrically arranged, the electric heating film 302 is arranged in a rectangular shape around, and the outer surface of the electric heating film 302 is arranged in a mesh structure. Through the heating effect of the electric heating film 302, the battery is uniformly heated in a low temperature environment, ensuring that the battery temperature will not be too low. Especially in cold environments, to prevent the battery temperature from being too low to cause performance degradation or low cycle efficiency. The grouping and symmetric arrangement of the electric heating film 302 can ensure more uniform heating of the battery, and avoid temperature gradient caused by uneven local heating, reducing the adverse effects on the battery.

[0026] The area of the damping block 303 gradually increases from top to bottom, the damping block 303 is in the shape of a circular truncated cone and is made of silica gel. The design of the damping block 303 is mainly to provide appropriate insertion resistance, so that the battery can be stably inserted into the partition frame 3 and accurately positioned after insertion. The damping block 303 is in the shape of a circular truncated cone, and the area gradually increases from top to bottom. This design can produce gradually increasing resistance, thereby ensuring that the battery is stably positioned in the partition frame 3.

[0027] The inner side of the outer protective plate 4 is fixed with a plug rod 5, the top end of the plug rod 5 is fixed with a plug head 501, the length of the plug rod 5 corresponds to the sum of the wall thicknesses of the shell 1 and the cover 2, and the diameter of the plug head 501 is 1-2mm larger than the diameter of the ventilation opening 6. The plug head 501 is in the shape of a circular truncated cone and is made of silica gel. When the battery module is in a normal temperature environment, the user can disassemble the outer protective plate 4 to make the plug rod 5 and the plug head 501 separate from the ventilation opening 6. This design exposes the ventilation opening of the battery module, allowing air to circulate, thereby improving the heat dissipation performance of the battery. This is of great significance to avoid battery overheating, improve battery efficiency and prolong battery life.

[0028] Working principle:

[0029] When assembling the battery module, the cover 2 can be pressed into the top end of the shell 1, and then assembled by inserting bolts into the threaded holes penetrating the four corners of the cover 2 and the partition frame 3;

[0030] And when the battery is inserted into the partition frame 3, the user will be significantly resisted, which is generated by the circular truncated cone and the area gradually increased from top to bottom of several damping blocks 303, so that after the battery is inserted will be positioned, so that the battery module is more stable;

[0031] And because the battery is separated in the partition frame 3, and because the partition frame 3 is filled with the isolation layer 301 composed of ceramic fiber, the ceramic fiber with low thermal conductivity constitutes the isolation layer between the batteries, so that the battery can effectively isolate heat in high temperature state, avoid heat propagation in the battery module, protect the battery from thermal runaway and overheating damage, and can isolate the battery from the low temperature environment as much as possible;

[0032] At the same time, the electrothermal film 302 at the middle position of the left and right ends of the inner wall of the partition frame 3 can also uniformly heat the battery by cooperating with the isolation layer 301, ensuring that the battery temperature will not be too low in low temperature environment, slowing down the impact of low temperature on battery endurance, allowing the battery module to be in a long cycle and high performance state, and not easily affected by the external environment;

[0033] When the battery module is in a normal temperature environment, the user can also disassemble the outer cover plate 4 located on the outer surface and back of the shell 1, so that the plug rod 5 and plug 501 are separated from the air vent 6, so that the battery module can be in a heat dissipation state, which can improve the heat dissipation of the battery module;

[0034] When the battery module needs to be sealed, the plug 501 can completely close the air vent 6 to avoid external gas entering or heat escaping, thereby maintaining the sealing and thermal stability of the battery module. The silicone material of the plug 501 ensures the sealing, which can still provide stable sealing effect even in high temperature or changing environmental conditions.

Claims

1. A lithium battery separator structure that facilitates heat insulation, comprising a casing, characterized in that: The top of the outer shell is fitted with a cover by bolts, a partition frame is fixedly installed in the middle of the interior of the outer shell, and removable outer protective plates are installed on the outer surface and back of the outer shell. The partition frame is filled with an isolation layer in the middle. Electric heating films are installed at the middle positions of the left and right ends of the inner wall of the partition frame. Damping blocks are fixed at the upper positions of the left and right ends of the inner wall of the partition frame. A plug rod is fixedly installed on the inner side of the outer protective plate, and a plug head is fixedly installed on the top of the plug rod.

2. The lithium battery separator structure for heat insulation as described in claim 1, characterized in that: The thickness of the isolation layer is two-thirds of the thickness of the partition frame, and the isolation layer is composed of ceramic fibers.

3. The lithium battery separator structure for heat insulation as described in claim 1, characterized in that: The electrothermal film is divided into four groups, with each group of electrothermal films arranged symmetrically.

4. The lithium battery separator structure for heat insulation as described in claim 1, characterized in that: The heating film is rectangular in shape around its perimeter, and its outer surface has a mesh structure.

5. A lithium battery separator structure for heat insulation as described in claim 1, characterized in that: The area of ​​the damping block gradually increases from top to bottom, and the damping block is frustum-shaped and made of silicone.

6. A lithium battery separator structure for heat insulation as described in claim 1, characterized in that: The outer surface and back of the outer shell and cover are perforated with several ventilation openings corresponding to the plug rod.

7. A lithium battery separator structure for heat insulation as described in claim 6, characterized in that: The length of the plug corresponds to the sum of the wall thickness of the outer shell and the cover. The diameter of the plug is 1-2 mm larger than the diameter of the vent. The plug is frustum-shaped and made of silicone.

8. A lithium battery separator structure for heat insulation as described in claim 7, characterized in that: The four corners of the cover and the partition frame are all perforated with threaded holes that match the bolts.

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