Safe lithium battery with multiple explosion-proof structures

Abstract

The utility model discloses a safety lithium battery with a multi-explosion-proof structure, which relates to the technical field of lithium batteries, solves the problems that a single explosion-proof means lacks multiple safety protection layers and is difficult to always keep high safety of the battery under various extreme conditions, and comprises a battery body, an explosion-proof shell and an explosion-proof component, the explosion-proof shell is wrapped outside the battery body, the explosion-proof assembly is arranged inside the explosion-proof shell, the battery body comprises a battery cell and electrolyte arranged in the battery cell, the explosion-proof assembly comprises an explosion-proof valve, an explosion-proof sheet and a thermal resistance material layer, the explosion-proof valve is arranged at the top of the explosion-proof shell, and the thermal resistance material layer is arranged on the explosion-proof shell. The explosion-proof sheet is arranged on the side surface of the explosion-proof shell, and the thermal resistance material layer covers the surface of the battery cell. According to the explosion-proof lithium battery, by combining multiple explosion-proof structures such as the explosion-proof shell, the explosion-proof valve, the explosion-proof sheet and the thermal resistance material layer, all-directional safety protection of the lithium battery in the charging and discharging process is realized, and the explosion and fire risks are remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to lithium battery technical field especially is related to a safe lithium battery of multiple explosion -proof structure. BACKGROUND

[0002] With the continuous progress of new energy technology, lithium battery has become the core energy storage element of many electronic devices and electric tools. Its high energy density, long cycle life and other characteristics make lithium battery occupy an important position in the market. However, the potential explosion and fire risk accompanied by lithium battery during charging and discharging has become a key factor restricting its further widespread application. At present, although explosion -proof lithium battery has appeared, there is still obvious improvement space in ensuring the durability and overall stability of explosion -proof effect.

[0003] In the prior art, for the explosion -proof demand of lithium battery, the prior art mainly adopts single explosion -proof measure. For example, by setting explosion -proof valve to release pressure when the internal pressure of the battery reaches the dangerous level, or using special material to make battery shell to enhance its impact resistance and heat resistance. These schemes can indeed reduce the explosion risk of lithium battery under normal circumstances.

[0004] However, the prior art still has the following defects: the single explosion -proof means of the prior art lacks multiple safety protection layers, and it is difficult to maintain high safety of the battery under various extreme conditions. Therefore, a safe lithium battery with multiple explosion -proof structure is proposed. UTILITY MODEL CONTENTS

[0005] In order to improve the problem that the single explosion -proof means lacks multiple safety protection layers and is difficult to maintain high safety of the battery under various extreme conditions, the utility model provides a safe lithium battery with multiple explosion -proof structure.

[0006] The utility model provides a safe lithium battery with multiple explosion -proof structure adopts the following technical scheme:

[0007] A safe lithium battery with multiple explosion -proof structure, comprising a battery body, an explosion -proof shell and an explosion -proof assembly, the explosion -proof shell is wrapped outside the battery body, the explosion -proof assembly is arranged inside the explosion -proof shell, and the battery body comprises a battery core and electrolyte arranged in the battery core.

[0008] The explosion -proof assembly comprises an explosion -proof valve, an explosion -proof sheet and a thermal resistance material layer, the explosion -proof valve is arranged at the top of the explosion -proof shell, the explosion -proof sheet is arranged on the side of the explosion -proof shell, and the thermal resistance material layer covers the surface of the battery core.

[0009] By adopting the above technical scheme, by combining the explosion -proof shell, the explosion -proof valve, the explosion -proof sheet and the thermal resistance material layer and other multiple explosion -proof structures, the all -round safety protection of lithium battery during charging and discharging is realized, and the explosion and fire risk is significantly reduced.

[0010] Optionally, the battery cell has a diaphragm inside, and electrode plates are provided on both sides of the diaphragm at the top of the battery cell.

[0011] By adopting the above technical solutions, the basic components of a lithium battery can be realized, which are responsible for storing and outputting electrical energy.

[0012] Optionally, the explosion-proof housing is made of high-strength aluminum alloy.

[0013] By adopting the above technical solution and using a high-strength aluminum alloy explosion-proof shell, the explosion-proof shell has sufficient impact resistance and explosion-proof capability, which can withstand the explosive impact force that may be generated inside the battery, protect the integrity of the battery structure, and prevent explosion fragments from causing damage to the external environment. In addition, aluminum alloy has the characteristics of being lightweight and high-strength, making it suitable for occasions with strict weight requirements. Furthermore, aluminum alloy has higher strength and corrosion resistance, making it suitable for use in harsh environments.

[0014] Optionally, the inner wall of the explosion-proof housing is provided with a number of explosion-proof protrusions.

[0015] By adopting the above technical solutions, these explosion-proof protrusions can absorb some of the explosion energy through their own deformation when an abnormality occurs inside the battery, thereby reducing the impact of the explosion and protecting the core components of the battery from damage. At the same time, the design of the explosion-proof protrusions can also increase the contact area between the explosion-proof shell and the battery cell, thereby improving the battery's heat dissipation efficiency and ensuring that the battery can work normally even in high-temperature environments.

[0016] Optionally, a pressure sensor is installed inside the explosion-proof housing between the explosion-proof valve and the explosion-proof disc, and the pressure sensor is electrically connected to an audible and visual alarm system.

[0017] By adopting the above technical solution and setting up a pressure sensor, the pressure sensor can monitor the pressure changes inside the battery in real time. Once the pressure reaches the preset threshold, the pressure sensor will immediately trigger the alarm system, reminding the user to take necessary safety measures through sound, light or other means, thereby further improving the safety of the battery and minimizing potential safety risks.

[0018] Optionally, a thermally conductive fiber layer is disposed inside the thermal resistance material layer.

[0019] By adopting the above technical solution, by adding a thermally conductive fiber layer inside the thermal resistance material layer, the thermally conductive fiber has excellent thermal conductivity and can quickly conduct the heat generated by the battery cell to the explosion-proof shell.

[0020] Optionally, a number of heat sinks are fixedly connected to the outer surface of the explosion-proof housing.

[0021] By adopting the above technical scheme, the heat is quickly dissipated to the external environment through the large-area heat dissipation fin of the explosion-proof shell, so that the battery is always kept in a safe working temperature range.

[0022] Optionally, the heat dissipation fin is a red copper sheet.

[0023] By adopting the above technical scheme, the heat dissipation effect of the heat dissipation fin can be significantly improved.

[0024] In summary, the utility model has the following beneficial effects:

[0025] 1. The utility model realizes all-round safety protection of the lithium battery in the charging and discharging process by combining multiple explosion-proof structures such as the explosion-proof shell, the explosion-proof valve, the explosion-proof sheet and the thermal resistance material layer, and significantly reduces the explosion and fire risk.

[0026] 2. The explosion-proof shell is made of high-strength explosion-proof material and has excellent impact resistance and explosion-proof ability, thereby providing a stable protection layer for the battery. At the same time, the explosion-proof shell can be flexibly selected from different materials to meet the needs of different application scenarios, which ensures safety and takes into account cost and weight.

[0027] 3. The explosion-proof valve and the explosion-proof sheet are arranged to release pressure in time when the internal pressure of the battery is too high, thereby providing additional explosion-proof protection and enhancing the stability and safety of the battery.

[0028] 4. The thermal resistance material layer effectively reduces the heat generated during the operation of the battery and prevents the occurrence of thermal runaway, thereby further improving the safety of the battery.

[0029] 5. By adding the explosion-proof protrusion, the pressure sensor and the heat-conducting fiber and other optimization measures, the explosion-proof effect is enhanced, the heat dissipation efficiency is improved, and the battery can safely and stably operate in a more severe environment. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic diagram of the overall structure of the utility model.

[0031] Figure 2 is a schematic diagram of the cross-sectional structure of the utility model.

[0032] Figure 3 is a schematic diagram of the structure of the explosion-proof shell of the utility model.

[0033] Figure 4 is a schematic diagram of the structure of the thermal resistance material layer of the utility model.

[0034] BRIEF DESCRIPTION OF DRAWINGS:

[0035] 1, battery body; 11, battery core; 12, electrolyte; 13, diaphragm; 14, plate; 2, explosion-proof shell; 21, explosion-proof convex; 22, cooling fin; 3, explosion-proof assembly; 31, explosion-proof valve; 32, explosion-proof sheet; 33, thermal resistance material layer; 331, thermal conductive fiber layer; 34, pressure sensor. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the utility model are clearly and completely described below. Figures 1-4 It is apparent that the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0037] Referring to Figure 1 and Figure 2 A safe lithium battery with multiple explosion-proof structures comprises a battery body 1, an explosion-proof shell 2 and an explosion-proof assembly 3. The battery body 1 comprises a battery core 11 and electrolyte 12 arranged in the battery core 11. The battery core 11 is internally provided with a diaphragm 13. The battery core 11 is provided with a plate 14 on both sides of the diaphragm 13 at the top. This is the basic component of the lithium battery, which is responsible for storing and outputting electric energy.

[0038] Referring to Figure 1 , Figure 2 and Figure 3 The explosion-proof shell 2 is wrapped outside the battery body 1. The explosion-proof shell 2 is made of high-strength aluminum alloy material. The explosion-proof shell 2 has sufficient impact resistance and explosion-proof capacity by using the explosion-proof shell 2 made of high-strength aluminum alloy material, which can resist the explosion impact force possibly generated inside the battery, protect the integrity of the battery structure, prevent explosion debris from causing harm to the external environment, and has the characteristics of light weight and high strength, which is suitable for occasions with strict weight requirements. The aluminum alloy has higher strength and corrosion resistance, which is suitable for use in harsh environments.

[0039] The inner wall of the explosion-proof shell 2 is provided with a plurality of explosion-proof convexes 21. When the battery inside is abnormal, the explosion-proof convexes 21 can absorb part of the explosion energy through their deformation, thereby reducing the impact of the explosion and protecting the core components of the battery from damage. At the same time, the design of the explosion-proof convexes 21 can also increase the contact area between the explosion-proof shell 2 and the battery core 11, thereby improving the heat dissipation efficiency of the battery and ensuring that the battery can work normally even in high-temperature environments.

[0040] Referring to Figure 1 , Figure 2 and Figure 3The explosion-proof component 3 is located inside the explosion-proof housing 2. The explosion-proof component 3 includes an explosion-proof valve 31, an explosion-proof plate 32, and a thermal resistance material layer 33. The explosion-proof valve 31 is located on the top of the explosion-proof housing 2, the explosion-proof plate 32 is located on the side of the explosion-proof housing 2, and the thermal resistance material layer 33 covers the surface of the battery cell 11. Through the setting of the explosion-proof component 3, the explosion-proof valve 31 can automatically open to release pressure when the internal pressure of the battery is too high, thereby preventing the battery from exploding due to excessive internal pressure. The explosion-proof plate 32 is connected to the explosion-proof valve 31 and can act as an additional safety barrier. When the explosion-proof valve 31 fails, it can further release the internal pressure of the battery through its own rupture, providing additional explosion protection. The thermal resistance material layer 33 tightly covers the surface of the battery cell 11. The thermal resistance material layer 33 has excellent thermal resistance performance and can effectively reduce the heat generated by the battery during operation, thereby preventing thermal runaway and ensuring stable operation of the battery.

[0041] Among them, reference Figure 1 and Figure 4 Several heat sinks 22 are fixedly connected to the outer surface of the explosion-proof housing 2. The heat sinks 22 are made of copper sheets. A thermally conductive fiber layer 331 is provided inside the thermal resistance material layer 33. By adding the thermally conductive fiber layer 331 inside the thermal resistance material layer 33, the thermally conductive fiber has excellent thermal conductivity and can quickly conduct the heat generated by the battery cell 11 to the explosion-proof housing 2. The heat is then quickly dissipated to the external environment through the large area heat sinks 22 of the explosion-proof housing 2, thereby ensuring that the battery is always kept within a safe operating temperature range.

[0042] Reference Figure 2 and Figure 3 A pressure sensor 34 is installed inside the explosion-proof housing 2 between the explosion-proof valve 31 and the explosion-proof plate 32. The pressure sensor 34 is electrically connected to an audible and visual alarm system. By installing the pressure sensor 34, the pressure sensor 34 can monitor the pressure changes inside the battery in real time. Once the pressure reaches the preset threshold, the pressure sensor will immediately trigger the alarm system to remind the user to take necessary safety measures through sound, light or other means, thereby further improving the safety of the battery and minimizing potential safety risks.

[0043] The implementation principle of the utility model discloses: through adopting the high strength aluminum alloy material quality's explosion -proof housing 2, make explosion -proof housing 2 have enough anti -impact and explosion -proof ability, can resist the explosion impact force that battery inside can produce, protect the integrality of battery structure, prevent the explosion fragment from causing harm to the external environment, and aluminum alloy has the characteristics of light weight, high strength, is applicable to the occasion of strict weight requirement, and aluminum alloy has higher strength and corrosion resistance, is applicable to the use under the harsh environment, through setting explosion -proof convex 21, these explosion -proof convex 21 when the abnormality occurs in the battery inside, can through the deformation of self to absorb part explosion energy, thereby reduce the impact of explosion, protect the battery core component from being damaged, simultaneously, the design of explosion -proof convex 21 can also increase the contact area between explosion -proof housing 2 and electric core 11, thereby improved the heat dissipation efficiency of battery, ensure that the battery can work normally even in high temperature environment, through the setting of explosion -proof assembly 3, explosion -proof valve 31 is used for when the internal pressure of battery is too high, can automatically open and release pressure, thereby avoid the battery to cause explosion due to internal pressure is too large, explosion -proof sheet 32 is connected with explosion -proof valve 31, explosion -proof sheet 32 can be used as an additional safety barrier, when explosion -proof valve 31 fails, can further release the pressure in the battery through the rupture of self, provide additional explosion -proof protection, thermal resistance material layer 33 is closely covered on the surface of electric core 11, thermal resistance material layer 33 has excellent thermal resistance, can effectively reduce the heat generated in the working process of battery, thereby prevent the battery from appearing thermal runaway phenomenon, ensure the stable operation of battery, through setting pressure sensor 34, pressure sensor 34 can monitor the pressure change in the battery in real time, once the pressure reaches the preset threshold, pressure sensor will immediately trigger the alarm system, remind the user to take necessary safety measures through sound, light or other ways, thereby further improve the safety of battery, reduce potential safety risk to the minimum, through adding heat -conducting fiber layer 331 in thermal resistance material layer 33, heat -conducting fiber has excellent heat -conducting performance, can rapidly conduct the heat generated by electric core 11 to explosion -proof housing 2, and through the large -area fin 22 of explosion -proof housing 2, the heat is quickly dissipated to the external environment, thereby ensure that the battery always keeps in the safe working temperature range.

[0044] The above only is the preferred embodiment of the utility model, and does not limit the utility model, although the utility model has been described in detail with reference to the foregoing embodiment, for the person skilled in the art, still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement to part technical feature. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be included in the protection scope of the utility model.

Claims

1. A safety lithium battery with multiple explosion-proof structure, comprising a battery body (1), an explosion-proof shell (2) and an explosion-proof assembly (3), characterized in that: The explosion-proof shell (2) is wrapped outside the battery body (1), the explosion-proof assembly (3) is arranged inside the explosion-proof shell (2), the battery body (1) comprises a battery cell (11) and electrolyte (12) arranged in the battery cell (11); The explosion-proof assembly (3) comprises an explosion-proof valve (31), an explosion-proof sheet (32) and a thermal resistance material layer (33), the explosion-proof valve (31) is arranged at the top of the explosion-proof shell (2), the explosion-proof sheet (32) is arranged at the side of the explosion-proof shell (2), and the thermal resistance material layer (33) covers the surface of the battery cell (11).

2. The safety lithium battery with multiple explosion-proof structure according to claim 1, characterized in that: The battery cell (11) is internally provided with a diaphragm (13), and the battery cell (11) is provided with a polar plate (14) on both sides of the diaphragm (13).

3. The safety lithium battery with multiple explosion-proof structure according to claim 1, characterized in that: The explosion-proof shell (2) is made of high-strength aluminum alloy material.

4. The safety lithium battery with multiple explosion-proof structure according to claim 1, characterized in that: A plurality of explosion-proof protrusions (21) are arranged on the inner wall of the explosion-proof shell (2).

5. The safety lithium battery with multiple explosion-proof structure according to claim 1, characterized in that: A pressure sensor (34) is arranged between the explosion-proof valve (31) and the explosion-proof sheet (32) in the explosion-proof shell (2).

6. The safety lithium battery with multiple explosion-proof structure according to claim 1, characterized in that: The thermal resistance material layer (33) is internally provided with a heat-conducting fiber layer (331).

7. A safety lithium battery with a multiple explosion-proof structure according to claim 1, characterized in that: A plurality of heat dissipation fins (22) are fixedly connected to the outer surface of the explosion-proof shell (2).

8. The safety lithium battery of claim 7, wherein: The heat dissipation fin (22) is a red copper sheet.

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