Battery pack circularly cooled by inert gas

Abstract

The invention discloses a battery pack circularly cooled by inert gas, and relates to the technical field of battery protection, the battery pack comprises a frame body used for assembling batteries, and the frame body is arranged in an external frame; a plurality of exhaust passages are arranged in the frame body; an inlet is formed in one side of the frame body and used for being connected with an external driving part for conveying inert gas; a discharge port is formed in the other side of the frame body and is used for being connected with a tank body for storing inert gas; a heat exchanger is further arranged between the discharge port and the tank body and used for exchanging heat in inert gas, efficient and safe battery heat management is achieved, in the aspect of heat exchange, the used inert gas (such as nitrogen, argon and the like) is stable in chemical property, leakage short circuit, corrosion or chemical reaction risks similar to traditional cooling liquid are eradicated to a certain extent, and the service life of the battery is prolonged. And the intrinsic safety is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of battery protection, and more particularly to a battery pack cooled by inert gas circulation. Background Art

[0002] With the rapid development of new energy vehicles and energy storage systems, the thermal management of high-energy-density power batteries faces severe challenges. Most traditional battery cooling technologies use liquid cooling systems. The current mainstream liquid cooling solutions rely on coolant (such as ethylene glycol aqueous solution) to circulate heat in the battery pack. However, the risk of coolant leakage always exists. Once it penetrates into the battery module, it can easily cause electrical short circuits, local overheating, and even thermal runaway. At the same time, long-term contact of coolant with metal parts may cause electrochemical corrosion and reduce system reliability. In addition, in extreme thermal runaway scenarios, some organic coolants themselves may become combustion aids or participate in violent chemical reactions, amplifying safety risks.

[0003] Based on this, the present invention provides a battery pack with inert gas circulation cooling. Summary of the Invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a battery pack with inert gas circulation cooling, which realizes efficient and safe battery thermal management. In terms of heat exchange, the inert gas used (such as nitrogen, argon, etc.) has stable chemical properties, which to a certain extent eliminates the risks of leakage, short circuit, corrosion or chemical reaction similar to traditional coolants, thereby ensuring inherent safety.

[0005] The present invention provides an inert gas circulation cooling battery pack adopting the following technical solution:

[0006] A battery pack with inert gas circulation cooling includes a frame for assembling batteries, the frame being arranged within an external frame; a plurality of exhaust ducts being arranged inside the frame; an inlet being provided on one side of the frame for connecting to a drive member for externally conveying inert gas; a discharge port being provided on the other side of the frame for connecting to a tank for storing inert gas; and a heat exchanger being provided between the discharge port and the tank for removing heat from the inert gas.

[0007] Preferably, a pair of slides are provided inside the frame, and the frame body can slide between the two slides.

[0008] Preferably, an elastic member is provided inside the frame at a position between the two slides. When the frame is assembled with the frame, the elastic member maintains an extruded contact state with the side end of the frame. When the connection between the frame and the frame is released, the elastic member uses its elastic reset to push the frame to move in a direction away from the frame.

[0009] Preferably, C-shaped bars are provided in both of the two slideways, slide bars are provided on both side surfaces of the frame body, the slide bars are slidably connected to the inner walls of the C-shaped bars, and a driving component is arranged in the slideway for driving the C-shaped bars to move away from the slide bars.

[0010] Preferably, the driving component includes a tooth shaft rotatably arranged in the slideway, a tooth plate is arranged on the side surface of the C-shaped bar, and the tooth plate is meshed with the tooth shaft.

[0011] Preferably, the side ends of both of the two tooth shafts are arranged outside the slideway, a driven gear is arranged at the side end of one of the tooth shafts, and a driving gear is rotatably arranged on the frame, the driving gear is meshed with the driven gear, and the side end of the other tooth shaft is in transmission connection with the side end of the driven gear through a transmission belt.

[0012] Preferably, limiting bars are arranged at the ends of both of the two tooth shafts far away from the driving gear, fastening rods are arranged on the side ends of the limiting bars in a threaded manner, and the side ends of the fastening rods can contact the frame body.

[0013] Preferably, the limiting bar includes a fixed sleeve fixedly arranged at the side end of the tooth shaft, a movable bar is slidably arranged at the side end of the fixed sleeve, and the fastening rod is arranged on the movable bar in a threaded manner.

[0014] In summary, the present invention includes the following beneficial technical effects:

[0015] 1. The inert gas in the tank body is conveyed into the frame body through the driving part, and the inert gas enters from the honeycomb plate at the bottom of the frame body. By adopting the design of the double-layer honeycomb plate and the flow guide plate to optimize the flow field, the intake turbulence is inhibited, so that the air flow is evenly distributed to the battery cells in the frame body, realizing uniform heat dissipation. Subsequently, the gas flows through the mouth-shaped pipeline to contact and exchange heat with the large surface of the battery cells, and finally enters the tank body. This design ensures that the bottom, large surface and top of the battery cells can all dissipate heat effectively, thereby completing the circulation of the inert gas in the frame body. During the circulation and flow of the inert gas, the heat generated by the batteries in the frame body can be taken away, and when the battery temperature is abnormally high and combustion may occur, the circulating inert gas can inhibit it. Through this structural design, efficient and safe battery thermal management is realized. In terms of heat exchange, the inert gas (such as nitrogen, argon, etc.) used has stable chemical properties, to a certain extent eliminating the risks of leakage and short circuit, corrosion or chemical reaction similar to traditional cooling liquids, and ensuring intrinsic safety.

[0016] 2. At the same time, the gas can flow evenly through the exhaust channels to cover all the battery surfaces, eliminating local hot spots. In combination with the heat exchanger design, stable temperature management is achieved. Moreover, the continuously circulating inert gas actively creates and maintains an inert environment inside the battery pack. By diluting and displacing oxygen, the combustion-supporting agent necessary for combustion is deprived, forming an inert barrier. It can not only immediately suppress the generation of open flames when the battery shows abnormal temperature rise, but also effectively block the high-temperature combustibles ejected from the thermally out-of-control single cell from igniting adjacent batteries, thus curbing the spread of accidents.

[0017] 3. When installing the frame, the frame can be aligned with the two slideways, and then the frame is pushed so that the frame is arranged between the two slideways, and the side of the frame squeezes the elastic member, and then the frame is assembled. This design can ensure the horizontality of the frame, facilitating the installation of connecting parts by the staff. At the same time, when a single frame is damaged, after removing the connecting parts, the elastic member can push the frame to move, which also facilitates the staff to take the damaged frame in a narrow area. Through this structural design, the problem of difficult disassembly of the battery pack in a narrow space is solved, reducing the maintenance difficulty, time cost and operation risk, and improving the maintainability and service convenience of the entire battery pack system.

[0018] 4. By rotating a gear shaft, the gear shaft drives the gear plate to move. Thus, the gear plate drives the C-shaped strip to move. The C-shaped strip moves away from the slide bar, causing the side of the frame to separate from the side of the C-shaped strip. At the same time, when a gear shaft rotates, it will cause the driving gear to rotate through the transmission belt. The rotation of the driving gear causes the driven gear to rotate, and thus another gear shaft also rotates, causing the corresponding gear plate to move, and further completing the mutual separation of the two C-shaped strips. In this design, when the battery pack frame bulges and deforms due to internal faults, the staff only needs to operate a single driving point, and the two C-shaped strips on both sides can be synchronously moved outward through the linkage mechanism, actively releasing the constraint of the inner wall of the C-shaped strip on the slide bar and creating a safety gap; effectively avoiding the situation that the bulged frame is stuck in the slideway due to expansion deformation, and ensuring that the elastic member can still smoothly eject the faulty frame after removing the connecting parts.

[0019] 5. By rotating the limiting bar, the rotation of the gear shaft is completed. At the same time, after the frame and the elastic member are in extrusion contact, the frame can also be squeezed and positioned by the fastening rod on the limiting bar, that is, there is no need for the staff to press the frame to install the connecting parts. And in this design, when disassembling the damaged battery pack, the limiting bar must be rotated first to disassemble the battery pack, which can avoid the directly impact of the bulged and deformed frame on the C-shaped strip. Through this structural design, a reliable auxiliary positioning force is provided, liberating the hands of the staff, and the frame can be stably fixed for the fastening installation of the connecting parts without additional pressing. Secondly, in the disassembly process, a safe operation sequence is forcibly introduced — the limiting bar must be operated first, and then the subsequent disassembly steps can be carried out, ensuring the controllability and safety of the disassembly process when dealing with high-risk bulging scenarios.

[0020] The above summary is only for the purpose of the specification and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent by reference to the accompanying drawings and the following detailed description. Description of the Drawings

[0021] Figure 1 is a schematic structural diagram of a battery pack and a frame in an embodiment of the present invention;

[0022] Figure 2 is a schematic structural diagram of the interior of a battery pack and a frame in an embodiment of the present invention;

[0023] Figure 3 is a schematic structural diagram of the other side of the interior of a battery pack and a frame in an embodiment of the present invention;

[0024] Figure 4 is a schematic structural diagram of a battery pack in an embodiment of the present invention;

[0025] Figure 5 is a schematic structural diagram of the interior of a battery pack in an embodiment of the present invention;

[0026] Figure 6 is a schematic sectional structural diagram of a battery pack in an embodiment of the present invention;

[0027] Figure 7 is a schematic structural diagram of a battery pack and a slideway in an embodiment of the present invention;

[0028] Figure 8 is a schematic structural diagram of the other side of a battery pack and a slideway in an embodiment of the present invention;

[0029] Figure 9 is a schematic structural diagram of a drive component in an embodiment of the present invention;

[0030] Figure 10 is a schematic structural diagram of an elastic member in an embodiment of the present invention;

[0031] Figure 11 is a schematic structural diagram of a limiting bar and a fastening rod in an embodiment of the present invention.

[0032] Description of Reference Numerals: 1, frame body; 2, frame; 3, exhaust duct; 4, slideway; 5, elastic member; 6, C-shaped bar; 7, slide bar; 8, drive component; 800, gear shaft; 801, gear plate; 802, driven gear; 803, driving gear; 804, limiting bar; 805, fastening rod. Detailed Embodiments

[0033] The following is a further detailed description of the present invention in conjunction with the attached Figures 1 to 11 drawings.

[0034] It should be noted that the drawings are schematic and not drawn to scale. For clarity and convenience, the relative sizes and proportions of parts shown in the drawings may be exaggerated or reduced in size. Any dimensions are illustrative only and are not intended to be limiting. Identical structures, elements, or components appearing in two or more drawings are denoted by the same reference numerals to indicate similar features.

[0035] Example 1

[0036] The embodiment of the present invention discloses a battery pack with inert gas circulation cooling. Figures 1 to 6 A battery pack with inert gas circulation cooling includes a frame 1 for assembling batteries, which is mounted within an external frame 2. The frames 1 are also located within a container or energy storage station. Current energy storage system designs are leading to increasingly dense distribution of frames 1 to meet growing power and energy storage demands. This is primarily due to multiple factors, including technical requirements, cost control, and space constraints. For example, increasing energy storage capacity and economic efficiency is key. To reduce the unit cost of energy storage systems (per kilowatt-hour), the need to maximize the number of battery packs within a standard container or energy storage station (e.g., a 40-foot container) directly increases the energy storage capacity per container or station. Industry Trends: Currently, global installed capacity of new energy storage capacity has reached 45.7GW (an 80% annual increase), with lithium-ion batteries dominating the market and driving high-density integrated designs. Efficient Utilization of Spatial Resources: The internal space within a container or energy storage station is fixed. Unused spaces between battery packs in traditional layouts (such as the spaces between columns in a row) are fully utilized through structural optimization (closely packed layout, with frames 1 densely distributed), reducing the proportion of ineffective space. Multiple exhaust ducts 3 are provided inside the frame 1; an inlet is provided on one side of the frame 1 for connecting to a drive member (air pump) for externally delivering inert gas; an outlet is provided on the other side of the frame 1 for connecting to a tank storing inert gas (such as nitrogen, argon, etc.); a heat exchanger is also provided between the outlet and the tank to remove heat from the inert gas.

[0037] Specifically, carbon dioxide may be used in addition to the inert gas.

[0038] Specifically, the inert gas in the tank is transported to the frame 1 through the driving component, and is discharged through the exhaust duct 3 to fill the frame 1. Then, the inert gas enters the heat exchanger through the exhaust port, and the heat in the inert gas is exchanged by the heat exchanger. Finally, the inert gas enters the tank, thereby completing the circulation of the inert gas in the frame 1. During the circulation of the inert gas, the heat generated by the battery in the frame 1 can be taken away, and when the battery temperature is abnormal and combustion may occur, the circulating inert gas can suppress it.

[0039] Specifically, inert gas enters through the honeycomb panel at the bottom of frame 1. By employing a double-layer honeycomb panel and guide plates, the flow field is optimized, reducing intake turbulence and evenly distributing airflow to the battery cells within frame 1, achieving uniform heat dissipation. The gas then flows through the mouth-shaped pipe, where it engages with the large surface of the battery cells for heat exchange, before entering the tank. This design ensures effective heat dissipation from the bottom, large surface, and top of the battery cells.

[0040] This structural design achieves efficient and safe battery thermal management. Regarding heat exchange, the chemically stable inert gases used (such as nitrogen and argon) eliminate the risks of leakage, short circuits, corrosion, or chemical reactions similar to those of traditional coolants, ensuring inherent safety. Furthermore, the gas flows evenly through the exhaust duct 3, covering all battery surfaces and eliminating local hot spots. Combined with the heat exchanger design, stable temperature management is achieved. Furthermore, the continuously circulating inert gas actively creates and maintains an inert environment within the battery pack. By diluting and displacing oxygen, it deprives the combustion aid necessary for combustion, forming an inert barrier. This not only instantly suppresses the generation of open flames when abnormal battery temperature rises, but also effectively blocks the high-temperature combustibles ejected from thermally runaway cells from igniting adjacent batteries, thus curbing the spread of accidents.

[0041] Example 2

[0042] This embodiment is further optimized based on the above embodiment 1, and the parts that are the same as the above technical solutions will not be repeated here. Figures 7 to 10 As shown, in order to further better implement the present invention, the following setting is particularly adopted. In this embodiment, a pair of slides 4 are provided inside the frame 2, and the frame body 1 can slide between the two slides 4.

[0043] like Figure 10 As shown, an elastic member 5 (such as a damping telescopic rod) is provided inside the frame 2 at a position between the two slides 4. When the frame 1 is assembled with the frame 2, the elastic member 5 maintains an extruded contact state with the side end of the frame 1. When the connection between the frame 1 and the frame 2 is released, the elastic member 5 uses its elastic reset to push the frame 1 to move in the direction of leaving the frame 2. The setting of the elastic member 5 is mainly to avoid the traditional setting of mechanical components such as handles on the front or side of the frame 1 (mainly the front, because the side space is small and people's hands are generally not enough to reach in), which makes it easy to deform or break due to frequent pulling and pulling (such as plastic / metal buckle fatigue), thereby increasing maintenance costs. The return rate of the prototype frame 1 with a handle is higher than that of the handleless design; if the handle is close to the battery or circuit board in the frame 1, the frequent brute force application by the maintenance personnel and the concentrated acceptance points may cause the handle connection point to be subjected to force feedback and squeeze the internal components, increasing the risk of short circuit. At the same time, the mechanical parts of the mobile frame 1 are separated from the frame 1 to achieve product separation, which can also greatly reduce the mold development cost of the frame 1 and the demand for the tensile strength of the shell material.

[0044] Specifically, when installing the frame 1, the frame 1 can be aligned with the two slideways 4, and then the frame 1 is pushed so that the frame 1 is arranged between the two slideways 4, and the side surface of the frame 1 presses the elastic member 5, and then the frame 1 is assembled. This design can ensure the horizontality of the frame 1, facilitate the installation of the connecting member by the staff, and at the same time, when a single frame 1 is damaged, after removing the connecting member, the elastic member 5 can push the frame 1 to move, which also facilitates the staff to take the damaged frame 1 in a narrow area.

[0045] Through this structural design, the problem of difficult disassembly of the battery pack in a narrow space is solved, the maintenance difficulty, time cost and operation risk are reduced, and the maintainability and service convenience of the entire battery pack system are improved.

[0046] Embodiment III

[0047] This embodiment is further optimized on the basis of the above-mentioned Embodiment II, and the same parts as the foregoing technical solutions will not be described herein again. As Figure 9 shown, in order to better implement the present invention, the following setting method is particularly adopted. In this embodiment, U-shaped strips 6 are arranged in both of the two slideways 4, slide strips 7 are arranged on both side surfaces of the frame 1, and the slide strips 7 are slidably connected with the inner walls of the U-shaped strips 6. A driving component 8 is arranged in the slideway 4 for driving the U-shaped strip 6 to move away from the slide strip 7.

[0048] As <了 Figure 9 shown, the driving component 8 includes a toothed shaft 800 rotatably arranged in the slideway 4, a toothed plate 801 is arranged on the side surface of the U-shaped strip 6, and the toothed plate 801 is meshed with the toothed shaft 800.

[0049] As Figure 8 and Figure 9 shown, the side ends of the two toothed shafts 800 are both arranged outside the slideway 4. A driven gear 802 is arranged at the side end of one toothed shaft 800, and a driving gear 803 is rotatably arranged on the frame 2. The driving gear 803 is meshed with the driven gear 802, and the side end of the other toothed shaft 800 is in transmission connection with the side end of the driven gear 802 through a transmission belt.

[0050] Specifically, by rotating a toothed shaft 800, the toothed shaft 800 drives the toothed plate 801 to move. Thus, the toothed plate 801 drives the U-shaped bar 6 to move. The U-shaped bar 6 moves away from the slide bar 7, causing the side surface of the frame body 1 to separate from the side surface of the U-shaped bar 6 (there is a gap). At the same time, when one toothed shaft 800 rotates, it will cause the driving gear 803 to rotate through the transmission belt. The rotation of the driving gear 803 causes the driven gear 802 to rotate. Thus, the other toothed shaft 800 also rotates, causing the corresponding toothed plate 801 to move, and further completing the mutual separation (or mutual approach) of the two U-shaped bars 6. This design can avoid the external extrusion of the bulged frame body 1 on the slideway 4 when the battery pack bulges, resulting in the inability of the battery pack to pop out or be removed.

[0051] Through this structural design, when the battery pack frame body 1 bulges and deform due to internal faults (such as thermal runaway), the staff only needs to operate a single driving point (rotate one toothed shaft 800), and the two U-shaped bars 6 on both sides can be synchronously moved outwards through the linkage mechanism, actively creating a safety gap between the inner wall of the U-shaped bar 6 and the slide bar 7. It effectively avoids the situation that the bulged frame body 1 is stuck in the slideway 4 due to expansion and deformation, ensuring that the elastic member 5 can still smoothly eject the faulty frame body 1 after the connecting member is disassembled.

[0052] As Figure 7 And Figure 11 As shown, limiting bars 804 are provided at one ends of the two toothed shafts 800 away from the driving gear 803. Fastening rods 805 are threadedly provided at the side ends of the limiting bars 804, and the side ends of the fastening rods 805 can contact the frame body 1.

[0053] Specifically, the rotation of the toothed shaft 800 is completed by rotating the limiting bar 804. At the same time, after the frame body 1 and the elastic member 5 are in extrusion contact, the frame body 1 can also be extruded and positioned by the fastening rod 805 on the limiting bar 804, that is, there is no need for the staff to press the frame body 1 for the installation of the connecting member (bolt or screw). And this design requires the rotation of the limiting bar 804 before the damaged battery pack can be disassembled, which can avoid the directly impact of the bulged and deformed frame body 1 on the U-shaped bar without the need for additional pressing.

[0054] Through this structural design, a reliable auxiliary positioning force is provided, liberating the hands of the staff, and the frame body 1 can be stabilized for the fastening installation of the connecting member (such as a bolt) without additional pressing. Secondly, in the disassembly process, a safe operation sequence is forcibly introduced - the limiting bar 804 must be operated first, and then the subsequent disassembly steps can be carried out, ensuring the controllability and safety of the disassembly process when dealing with high-risk bulging scenarios.

[0055] As Figure 11As shown, the limiting bar 804 includes a fixed sleeve fixedly set on the side end of the gear shaft 800, and a movable bar is slidably set on the side end of the fixed sleeve. The fastening rod 805 is threadedly set on the movable bar. This design can facilitate the staff to adjust the position of the fastening rod 805 and when installing the battery pack, the limiting bar 804 can be retracted to the shortest position to reduce the obstruction of the limiting bar 804.

[0056] Specifically, the inert gas circulation-cooled battery pack of the present invention can be directly or indirectly applied to any means of transportation that can directly or indirectly use a pack battery pack in the prior art, such as airplanes, ships, and EMU trains, to provide power output for the vehicle through the inert gas circulation-cooled battery pack.

[0057] Specifically, the control method of the present invention is controlled by a controller, and the control circuit of the controller can be implemented by simple programming by those skilled in the art, and the control method and circuit connection will not be explained in detail here.

[0058] The standard parts used in the present invention can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.

[0059] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0060] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0061] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0062] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0063] In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0064] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery pack with inert gas circulation cooling, characterized in that: Comprising: A frame (1) for assembling a battery, and the frame (1) is arranged inside an external frame (2); A plurality of exhaust channels (3) are arranged inside the frame (1); One side of the frame (1) is provided with an inlet for connecting a driving member for conveying inert gas externally; The other side of the frame (1) is provided with an outlet for connecting a tank for storing inert gas; A heat exchanger is further arranged between the outlet and the tank for removing the heat in the inert gas.

2. The battery pack with inert gas circulation cooling according to claim 1, characterized in that: A pair of slideways (4) are arranged inside the frame (2), and the frame (1) can slide between the two slideways (4).

3. The battery pack with inert gas circulation cooling according to claim 2, characterized in that: An elastic member (5) is arranged inside the frame (2) at a position between the two slideways (4). In the state where the frame (1) is assembled to the frame (2), the elastic member (5) keeps an extrusion contact state with the side end of the frame (1). When the connecting member between the frame (1) and the frame (2) is released, the elastic member (5) uses its elastic reset to push the frame (1) to move along the direction away from the frame (2).

4. The battery pack with inert gas circulation cooling according to claim 2, characterized in that: C-shaped strips (6) are arranged inside both of the two slideways (4). Slide strips (7) are arranged on both side surfaces of the frame (1). The slide strips (7) are slidably connected to the inner walls of the C-shaped strips (6). A driving assembly (8) is arranged inside the slideways (asc4) for driving the C-shaped strips (6) to move away from the slide strips (7).

5. The battery pack with inert gas circulation cooling according to claim 4, characterized in that: The driving assembly (8) includes a toothed shaft (800) rotatably arranged inside the slideway (4). A toothed plate (801) is arranged on the side surface of the C-shaped strip (6). The toothed plate (801) is meshed and connected with the toothed shaft (800).

6. The battery pack with inert gas circulation cooling according to claim 5, characterized in that: The side ends of both of the two toothed shafts (800) are arranged outside the slideway (4). A driven gear (802) is arranged at the side end of one of the toothed shafts (800). A driving gear (803) is rotatably arranged on the frame (2). The driving gear (803) is meshed and connected with the driven gear (802). The side end of the other toothed shaft (800) is in transmission connection with the side end of the driven gear (802) through a transmission belt.

7. The battery pack with inert gas circulation cooling according to claim 6, characterized in that: Limiting strips (804) are arranged at one ends of both of the two toothed shafts (800) far away from the driving gear (803). A fastening rod (805) is threadedly arranged at the side end of the limiting strip (804). The side end of the fastening rod (805) can contact the frame (1).

8. The inert gas circulation cooled battery pack according to claim 7, characterized in that: The limiting strip (804) includes a fixed sleeve fixedly arranged at the side end of the toothed shaft (800). A moving strip is slidably arranged at the side end of the fixed sleeve. The fastening rod (805) is threadedly arranged on the moving strip.

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