A cylindrical lithium-ion battery assembly structure

Abstract

The utility model relates to a kind of cylindrical lithium ion battery combination structure in battery assembly field, including honeycomb substrate, circuit and top cover, top cover is connected with the upper end of honeycomb substrate, circuit is set in the lower end of honeycomb substrate, the inner chamber of honeycomb substrate is provided with battery cylinder, the honeycomb structure of honeycomb substrate can disperse overall stress, improve the impact resistance of combination structure and stability, while providing uniform mounting space for battery cylinder, avoid battery cylinder due to installation deviation influence overall performance, the lower end surface of bottom plate and the upper end surface of serpentine microchannel are closely adhered, closely adhered can reduce the thermal resistance between bottom plate and serpentine microchannel.The cylindrical lithium ion battery combination structure, sealing plate connects inner cover and top cover to strengthen stability, also improve sealed dust moisture;Conductive sheet connects battery tab and transmits current to maintain power supply continuity;Serpentine microchannel increases heat dissipation area, maintains battery reasonable temperature by taking away heat with coolant, avoid high temperature influence performance and life.

Description

Technical Field

[0001] This utility model relates to the field of battery assembly, specifically to a cylindrical lithium-ion battery assembly structure. Background Technology

[0002] The cylindrical lithium-ion battery pack structure belongs to the field of lithium-ion battery pack technology. Specifically, it involves an integrated pack structure design for cylindrical lithium-ion batteries, which aims to improve the safety, stability and performance of the battery pack through structural optimization.

[0003] Existing cylindrical lithium-ion battery pack structures have several shortcomings in practical applications. Regarding impact resistance and stability, traditional structures lack a substrate design that effectively disperses stress, making the battery pack susceptible to deformation or displacement due to localized stress concentration when subjected to external impacts. Furthermore, the installation space of the battery pack lacks uniformity, leading to potential misalignment. In terms of protection, external protective measures may only cover partial areas, failing to provide comprehensive protection for the battery pack, making it prone to surface damage during collisions or friction. Regarding bottom sealing and support, traditional base plates may have insufficient sealing or inadequate support structures, failing to effectively prevent bottom wear and potentially affecting the stability of the battery cells due to unstable support. Finally, in terms of thermal runaway protection, the lack of effective flame-retardant and heat-insulating measures means that in the event of thermal runaway, flames and high temperatures can easily spread to other areas, significantly increasing the risk of fire. Utility Model Content

[0004] The purpose of this invention is to address the above-mentioned deficiencies by providing a cylindrical lithium-ion battery assembly structure. This structure solves the problems of existing technologies where external protective measures may only cover a portion of the area, failing to provide comprehensive protection for the battery casing and making the battery surface susceptible to damage during collisions or friction; regarding bottom sealing and support, traditional base plates may have insufficient sealing or unreasonable support structures, failing to effectively prevent bottom wear and potentially affecting the stability of the battery cells due to unstable support; and in terms of thermal runaway protection, there is a lack of effective flame-retardant and heat-insulating measures, which means that once the battery experiences thermal runaway, flames and high temperatures can easily spread to other areas, significantly increasing the risk of fire.

[0005] The purpose of this utility model is achieved through the following means: a cylindrical lithium-ion battery assembly structure, including a honeycomb substrate, circuitry and a top cover, wherein the top cover is connected to the upper end of the honeycomb substrate, the circuitry is disposed at the lower end of the honeycomb substrate, and a battery sleeve is disposed in the inner cavity of the honeycomb substrate. The honeycomb structure of the honeycomb substrate can disperse the overall force, improve the impact resistance and stability of the assembly structure, and at the same time provide a uniform installation space for the battery sleeve, avoiding the impact of battery sleeve installation misalignment on the overall performance.

[0006] The battery tube is uniformly provided with an outer protective plate. The outer protective plate is evenly distributed and can fully wrap the battery tube, effectively resisting damage to the battery tube from external collisions and friction, and protecting the internal battery unit. The bottom of the inner cavity of the battery tube is provided with a bottom plate. The bottom plate can seal the bottom of the inner cavity of the battery tube and provide support for the internal battery unit, preventing the bottom of the battery unit from directly contacting the battery tube and causing wear.

[0007] The inner cavity of the battery tube is uniformly provided with flame-retardant plates. The uniform arrangement of the flame-retardant plates can prevent the flame from spreading in the inner cavity of the battery tube when the battery experiences thermal runaway and generates flames, isolate the high-temperature area, and reduce the risk of fire. The upper end of the battery tube is provided with an inner cover. The inner cover can achieve a preliminary seal at the upper part of the battery tube and fix the conductive sheet at the lower end to ensure the stability of the conductive sheet.

[0008] The upper end of the inner cover is provided with a sealing plate, which is connected to the top cover. The sealing plate connects the inner cover and the top cover, which can enhance the connection stability between the battery pack and the top cover, and further improve the sealing performance of the battery pack to prevent external dust and moisture from entering. The lower end of the inner cover is provided with a conductive sheet, which can contact the tabs of the battery cells to realize the current conduction between the battery cells and ensure the power supply continuity of the combined structure.

[0009] The bottom of the battery pack is provided with a serpentine microchannel. The serpentine microchannel increases the heat dissipation area through its meandering structure. When the coolant or heat dissipation medium flows through it, it can quickly remove the heat conducted from the bottom of the battery pack, maintain the battery cell operating temperature within a reasonable range, and avoid high temperature affecting battery performance and lifespan.

[0010] Furthermore, a pressure-locking cover is provided between the top cover and the honeycomb substrate, and an explosion-proof pressure relief valve is provided on the outside of the pressure-locking cover. The pressure-locking cover can enhance the connection and sealing between the top cover and the honeycomb substrate, prevent external impurities from entering the internal structure, and provide pre-tightening force when the battery expands slightly to avoid structural loosening.

[0011] The explosion-proof pressure relief valve can automatically open to release pressure when high-pressure gas is generated inside the battery due to a malfunction, preventing the battery assembly structure from exploding due to excessive pressure and ensuring safe use.

[0012] Furthermore, the inner cavity of the battery tube is provided with expanded graphite particles and sealed with a flame-retardant film. The expanded graphite particles will expand rapidly when the battery is at high temperature, filling the gaps in the inner cavity of the battery tube, isolating oxygen, and enhancing the flame-retardant effect. The sealed flame-retardant film can prevent the expanded graphite particles from leaking, and at the same time further block the penetration of flames and high-temperature gases, thus doubly improving the fire resistance of the battery tube.

[0013] The outer protective plate is a corrugated ceramic fiber reinforced resin tube. The corrugated structure can absorb external impact energy and reduce the deformation of the battery tube caused by collision. The ceramic fiber reinforced resin material has high temperature resistance and corrosion resistance, which can protect the battery tube in complex environments and extend the service life of the outer protective plate.

[0014] Furthermore, the conductive sheet is arranged in a three-pronged radial shape. The three-pronged radial structure can increase the contact area between the conductive sheet and the battery tab, reduce the contact resistance, reduce heat loss during current conduction, and avoid local overheating that could damage the conductive sheet or the battery tab.

[0015] The conductive sheet is silver-plated on the outside. The silver plating layer can improve the conductivity of the conductive sheet, while preventing oxidation and rust on the surface of the conductive sheet, maintaining a long-term stable conductivity and ensuring the power supply efficiency of the battery combination structure.

[0016] Furthermore, the serpentine microchannel is a stainless steel pipe, which has the characteristics of high temperature resistance, high pressure resistance, and corrosion resistance. It can adapt to temperature changes and heat dissipation medium erosion during battery operation, ensuring long-term stable operation of the serpentine microchannel.

[0017] The two ends of the serpentine microchannel penetrate the sidewall of the honeycomb substrate and extend to the outside. The extension of both ends to the outside facilitates connection to the external heat dissipation system, forming a complete heat dissipation cycle. This allows the heat dissipation medium to continuously flow through the serpentine microchannel, ensuring the continuity of the heat dissipation effect.

[0018] Furthermore, the lower end face of the base plate is in close contact with the upper end face of the serpentine microchannel. This close contact reduces the thermal resistance between the base plate and the serpentine microchannel, allowing the heat generated by the battery inside the battery pack to be quickly transferred to the serpentine microchannel through the base plate, thereby improving heat dissipation efficiency.

[0019] An annular positioning groove is provided on the upper surface of the base plate. The annular positioning groove can position and fix the battery unit to prevent the battery unit from shifting due to vibration and shaking during use, ensuring stable contact between the battery unit and the conductive sheet, and maintaining the reliability of current conduction.

[0020] The beneficial effects of this utility model are:

[0021] This cylindrical lithium-ion battery assembly structure features a honeycomb substrate that distributes stress, enhancing impact resistance and stability, and provides uniform installation space for the battery pack to prevent misalignment. An outer protective plate provides all-around protection against collisions and friction damage. A bottom plate seals the bottom of the battery pack and supports the battery cells to prevent wear. A flame-retardant plate prevents flame spread and reduces fire risk in the event of thermal runaway. An inner cover initially seals the upper part of the battery pack and secures the conductive sheet. A sealing plate connects the inner and top covers to enhance stability and improve sealing against dust and moisture. Conductive sheets connect to the battery terminals to transmit current and ensure continuous power supply. A serpentine microchannel increases the heat dissipation area, allowing the coolant to remove heat and maintain a reasonable battery temperature, preventing high temperatures from affecting performance and lifespan. Attached Figure Description

[0022] Figure 1 This is a front view of a cylindrical lithium-ion battery assembly structure according to the present invention;

[0023] Figure 2 This is a partial cross-sectional view of the battery casing of a cylindrical lithium-ion battery assembly structure according to this utility model;

[0024] Figure 3 This is a schematic diagram of the inner cover and outer surface of a cylindrical lithium-ion battery pack according to the present invention.

[0025] Figure 4 This is a schematic diagram of a cylindrical lithium-ion battery assembly structure according to the present invention.

[0026] In the diagram, 1 is the honeycomb substrate; 2 is the circuit board; 3 is the top cover; 4 is the battery tube; 41 is the outer protective plate; 42 is the sealing plate; 43 is the inner cover; 44 is the conductive sheet; 45 is the bottom plate; and 46 is the flame-retardant plate. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0028] In this embodiment, refer to Figure 1 and Figure 2 The specific implementation of the cylindrical lithium-ion battery assembly structure includes a honeycomb substrate 1, a circuit 2 and a top cover 3. The top cover 3 is connected to the upper end of the honeycomb substrate 1, the circuit 2 is located at the lower end of the honeycomb substrate 1, and a battery tube 4 is provided in the inner cavity of the honeycomb substrate 1. The honeycomb structure of the honeycomb substrate 1 can disperse the overall force, improve the impact resistance and stability of the assembly structure, and at the same time provide a uniform installation space for the battery tube 4, so as to avoid the battery tube 4 from affecting the overall performance due to installation misalignment.

[0029] The battery tube 4 is uniformly provided with an outer protective plate 41. The outer protective plate 41 is evenly distributed and can fully wrap the battery tube 4, effectively resisting the damage to the battery tube 4 caused by external collisions and friction, and protecting the internal battery unit. The bottom of the inner cavity of the battery tube 4 is provided with a bottom plate 45. The bottom plate 45 can seal the bottom of the inner cavity of the battery tube 4, and at the same time provide support for the internal battery unit, preventing the bottom of the battery unit from directly contacting the battery tube 4 and causing wear.

[0030] Reference Figure 3 and Figure 4 The inner cavity of the battery tube 4 is uniformly provided with flame-retardant plates 46. The uniform arrangement of flame-retardant plates 46 can prevent the flame from spreading in the inner cavity of the battery tube 4 when the battery experiences thermal runaway and generates flames, isolate the high-temperature area, and reduce the risk of fire. An inner cover 43 is inserted into the upper end of the battery tube 4. The inner cover 43 can achieve a preliminary seal on the upper part of the battery tube 4 when inserted into the upper end of the battery tube 4, and at the same time fix the conductive sheet 44 at the lower end to ensure the stability of the conductive sheet 44.

[0031] The upper end of the inner cover 43 is provided with a sealing plate 42, which is connected to the top cover 3. The sealing plate 42 connects the inner cover 43 and the top cover 3, which can enhance the connection stability between the battery pack 4 and the top cover 3, and further improve the sealing performance of the battery pack 4 to prevent external dust and moisture from entering. The lower end of the inner cover 43 is provided with a conductive sheet 44, which can contact the electrode tabs of the battery unit to realize the current conduction between the battery units and ensure the power supply continuity of the combined structure.

[0032] The bottom of the battery pack 4 is equipped with a serpentine microchannel. The serpentine microchannel increases the heat dissipation area through its meandering structure. When the coolant or heat dissipation medium flows through it, it can quickly remove the heat conducted at the bottom of the battery pack 4, maintain the battery cell operating temperature within a reasonable range, and avoid high temperature affecting battery performance and life.

[0033] A pressure-locking cover is provided between the top cover 3 and the honeycomb substrate 1, and an explosion-proof pressure relief valve is provided on the outside of the pressure-locking cover. The pressure-locking cover can enhance the connection and sealing between the top cover 3 and the honeycomb substrate 1, prevent external impurities from entering the internal structure, and provide pre-tightening force when the battery expands slightly to avoid structural loosening.

[0034] The explosion-proof pressure relief valve can automatically open to release pressure when high-pressure gas is generated inside the battery due to a malfunction, preventing the battery assembly structure from exploding due to excessive pressure and ensuring safe use.

[0035] The inner cavity of the battery tube 4 is equipped with expanded graphite particles and sealed with a flame-retardant membrane. The expanded graphite particles will expand rapidly when the battery is at high temperature, filling the gaps in the inner cavity of the battery tube 4, isolating oxygen, and enhancing the flame-retardant effect. The sealed flame-retardant membrane can prevent the expanded graphite particles from leaking, and further block the penetration of flames and high-temperature gases, thus doubly improving the fire resistance of the battery tube 4.

[0036] The outer protective plate 41 is a corrugated ceramic fiber reinforced resin tube. The corrugated structure can absorb external impact energy and reduce the deformation of the battery tube 4 caused by collision. The ceramic fiber reinforced resin material has high temperature resistance and corrosion resistance, which can protect the battery tube 4 in complex environments and extend the service life of the outer protective plate 41.

[0037] The conductive sheet 44 is arranged in a three-claw radial shape. The three-claw radial structure can increase the contact area between the conductive sheet 44 and the battery tab, reduce the contact resistance, reduce the heat loss during current conduction, and avoid local overheating that could damage the conductive sheet 44 or the battery tab.

[0038] The outer surface of the conductive sheet 44 is silver-plated. The silver plating layer can improve the conductivity of the conductive sheet 44, while preventing oxidation and rust on the surface of the conductive sheet 44, maintaining a long-term stable conductivity effect, and ensuring the power supply efficiency of the battery pack structure.

[0039] The serpentine microchannel is made of stainless steel pipe. Stainless steel pipe has the characteristics of high temperature resistance, high pressure resistance and corrosion resistance. It can adapt to the temperature changes and erosion of the heat dissipation medium during the battery operation process, ensuring the long-term stable operation of the serpentine microchannel.

[0040] The two ends of the serpentine microchannel penetrate the sidewall of the honeycomb substrate 1 and extend to the outside. The extension of the two ends to the outside facilitates the connection to the external heat dissipation system, forming a complete heat dissipation cycle, so that the heat dissipation medium continuously flows through the serpentine microchannel, ensuring the continuity of the heat dissipation effect.

[0041] The lower end face of the base plate 45 is in close contact with the upper end face of the serpentine microchannel. This close contact reduces the thermal resistance between the base plate 45 and the serpentine microchannel, allowing the heat generated by the battery inside the battery box 4 to be quickly transferred to the serpentine microchannel through the base plate 45, thereby improving heat dissipation efficiency.

[0042] An annular positioning groove is provided on the upper surface of the base plate 45. The annular positioning groove can position and fix the battery unit to prevent the battery unit from shifting due to vibration and shaking during use, and ensure stable contact between the battery unit and the conductive sheet 44 to maintain the reliability of current conduction.

[0043] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, various simple deductions or substitutions can be made without departing from the concept of the present invention, and all such modifications and substitutions should be considered within the scope of protection of the present invention.

Claims

1. A cylindrical lithium-ion battery assembly structure, comprising a honeycomb substrate, circuitry, and a top cover, wherein the top cover is connected to the upper end of the honeycomb substrate, and the circuitry is disposed at the lower end of the honeycomb substrate, characterized in that: The inner cavity of the honeycomb substrate is provided with a battery tube, the outer protective plate is uniformly arranged on the outside of the battery tube, the bottom of the inner cavity of the battery tube is provided with a bottom plate, the inner cavity of the battery tube is uniformly arranged with flame-retardant plates, the upper end of the battery tube is inserted with an inner cover, the upper end of the inner cover is provided with a sealing plate, the sealing plate is connected to the top cover, the lower end of the inner cover is provided with a conductive sheet, and the bottom of the battery tube is provided with a serpentine microchannel.

2. The cylindrical lithium-ion battery assembly structure according to claim 1, characterized in that: A pressure-locking cover is provided between the top cover and the honeycomb substrate, and an explosion-proof pressure relief valve is provided on the outside of the pressure-locking cover.

3. The cylindrical lithium-ion battery assembly structure according to claim 1, characterized in that: The inner cavity of the battery tube is provided with expanded graphite particles and sealed with a flame-retardant membrane, and the outer protective plate is a corrugated ceramic fiber reinforced resin tube.

4. The cylindrical lithium-ion battery assembly structure according to claim 1, characterized in that: The conductive sheet is arranged in a three-pronged radial pattern, and its exterior is silver-plated.

5. The cylindrical lithium-ion battery assembly structure according to claim 1, characterized in that: The serpentine microchannel is a stainless steel pipe, with both ends penetrating the sidewall of the honeycomb substrate and extending to the outside.

6. The cylindrical lithium-ion battery assembly structure according to claim 1, characterized in that: The lower end face of the base plate is in close contact with the upper end face of the serpentine microchannel, and an annular positioning groove is provided on the upper end face of the base plate.

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