Battery pack

Abstract

SOLUTION: The present invention relates to a technical field of a power supply battery, and more particularly to a battery pack. The battery pack includes a box body 1 and top covers 21, 22, 23 and 24, and the box body has a cell mounting chamber and an exhaust chamber. The top cover covers the box body and has a gas-solid separation flow passage, and the gas-solid separation flow passage is used so as to centrifugally separate a particulate matter and a gas in a smoke gas flowing through the gas-solid separation flow passage. The gas-solid separation flow passage has an air inlet port communicating with the cell mounting chamber, and an exhaust port communicating with the exhaust chamber.EFFECT: The battery pack arranges the gas-solid separation flow passage directly in the top plate. Thereby, the separation of the gas and the particulate matter in the smoke gas is achieved, and there is no need to arrange a separate gas-solid separation member. Thus, the structure is simplified and the cost is reduced. Furthermore, the gas-solid separation flow passage uses a centrifugal force in order to separate the particulate matter and the gas in the flow of the smoke gas. Thereby, a satisfactory separation effect is provided, a possibility of causing clogging is low, and a safety performance of the battery pack is improved.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the technical field of battery power supplies, and more particularly to battery packs. [Background technology]

[0002] Lithium-ion batteries are widely used in various fields, such as transportation and energy storage. To meet application requirements, lithium cells are typically connected in series, parallel, or a combination of series and parallel to form a group. However, cells are susceptible to thermal runaway under mechanical, electrical, and thermal abuse, either alone or in combination. The primary symptoms of a thermal runaway cell are a series of internal chain reactions and a rapid temperature rise. The decomposition and regeneration of the solid electrolyte interface (SEI) film and the evaporation of the electrolyte cause an increase in the cell's internal pressure. If the cell's internal pressure reaches the opening pressure of the cell's safety valve, the cell releases a large amount of gas and particulate matter. The particulate matter includes droplets, nickel oxide, and copper foil, and the gas and particulate matter are vented outside the battery pack through the explosion-proof valve. The high-temperature particulate matter released along with the gas can ignite hot smoke and cause a fire outside the battery pack, posing a serious risk to human life and property. Summary of the Invention [Problem to be solved by the invention]

[0003] Currently, a common gas-solid separation method is to add a filter to the battery pack to block hot particles. However, using a filter to block hot particles has many drawbacks. After a thermal runaway occurs in a cell, a large amount of material is released from the cell, especially when the thermal runaway is widespread. If the filter pore size is too small, the filter is easily clogged, resulting in poor exhaust performance for the battery pack. If the filter pore size is too large, the filter cannot block hot particles.

[0004] In view of the above-mentioned shortcomings in the related art, the present invention provides a battery pack that aims to solve the problems of poor exhaust inside the battery pack or fire outside the battery pack caused by the difficulty in separating particulate matter in the smoke gas after thermal runaway occurs in the cells in the related art, thereby improving the safety performance of the battery pack. [Means for solving the problem]

[0005] To achieve the above, the present invention provides a battery pack including a box and a top cover. The box has a cell mounting chamber and an exhaust chamber. The top cover covers the box and is provided with a gas-solid separation channel, which is used to separate particulate matter and gases in the flue gas passing through it by centrifugal separation. An inlet of the gas-solid separation channel communicates with the cell mounting chamber, and an outlet of the gas-solid separation channel communicates with the exhaust chamber.

[0006] Optionally, the gas-solid separation channels lie in the same plane.

[0007] Optionally, the plane in which the gas-solid separation channel lies is perpendicular to the height direction of the box.

[0008] Optionally, the gas-solid separation channel comprises a plurality of separation channel sections in communication with each other, the separation channel sections being connected end-to-end in sequence to form a spiral structure.

[0009] Optionally, the top cover has solids storage chambers corresponding to the respective separation channel sections, each solids storage chamber being positioned outside the periphery of the corresponding separation channel section and communicating with the corresponding separation channel section.

[0010] Optionally, the inlet is located in the outer ring of the spiral and the outlet is located in the inner ring of the spiral. The flow cross section of each separated channel section decreases successively from near the inlet to farther from the inlet.

[0011] Optionally, the cross section of the gas-solid separation channel tapers from an end proximal to the inlet to an end distal to the inlet.

[0012] Optionally, the top cover includes an upper plate, a lower plate, and a channel assembly sandwiched between the upper plate and the lower plate. The gas-solid separation channel is disposed in the channel assembly. The lower plate faces the box body, and the exhaust structure is disposed in an area of ​​the lower plate covering the cell mounting chamber. The exhaust structure communicates with the air inlet.

[0013] Optionally, the flow path assembly includes a flow path plate and a buffer plate stacked together, the flow path plate being located between the upper plate and the buffer plate, with a flow groove disposed on the side of the flow path plate facing the buffer plate. The buffer plate is connected to the flow path plate, covers the flow groove, and defines a gas-solid separation flow path together with the flow groove. The exhaust end of the flow groove penetrates the side of the flow path plate facing the upper plate to form an exhaust port. The buffer plate is provided with a first air vent penetrating the buffer plate, the first air vent overlapping at least a portion of the inlet end of the flow groove to define an inlet port.

[0014] Optionally, a buffer chamber is disposed on the side of the buffer plate facing the lower plate to cover the exhaust structure, and the inlet end of the first vent penetrates the inner wall of the buffer chamber to communicate with the buffer chamber.

[0015] Optionally, the flow path plate, the buffer plate, and the lower plate each have a second vent port communicating with the exhaust chamber. A groove is arranged on the side of the upper plate facing the flow path plate to connect the exhaust port to the second vent port of the flow path plate. Smoke gas in the cell mounting chamber is discharged by the exhaust structure, flows through the buffer chamber, the first vent port, and the gas-solid separation flow path in order, and then enters the exhaust chamber through the second vent port.

[0016] Optionally, a mica plate is disposed on the side of the lower plate facing the box body, and the mica plate is provided with a frangible structure corresponding to the exhaust structure and an opening corresponding to the exhaust chamber.

[0017] Optionally, the box has a chamber and a partition mounted within the chamber, the partition dividing the chamber into a cell mounting chamber and an exhaust chamber, the cell mounting chamber and the exhaust chamber communicating with each other only through the gas-solid separation channel when the top cover is placed over the box.

[0018] Optionally, an explosion-proof valve is included, which is attached to the box and is used to exhaust gases in the exhaust chamber when in an open state. [Effects of the Invention]

[0019] As described above, the beneficial effects provided by the battery pack of the present invention include the following: By directly arranging the gas-solid separation channel on the upper plate, separation of gas and particulate matter in the flue gas is achieved, eliminating the need for a separate gas-solid separation element. This simplifies the structure and reduces costs. Furthermore, the gas-solid separation channel uses centrifugal force to separate particulate matter and gas in the flue gas flow. This provides a good separation effect, reduces the possibility of clogging, and improves the safety performance of the battery pack. [Brief explanation of the drawings]

[0020] [Figure 1] FIG. 1 is an exploded view of a battery pack according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram of an exhaust path of the battery pack of FIG. 1. [Figure 3] This is the structural part of the box shown in Figure 1. [Figure 4] FIG. 2 is a bottom view of the flow path plate of FIG. 1. [Figure 5] FIG. 2 is a top view of the flow path plate of FIG. [Figure 6] FIG. 2 is a top view of the buffer plate of FIG. [Figure 7] FIG. 7 is a cross-sectional view taken along line AA in FIG. 6. [Figure 8] FIG. 2 is a top view of the upper plate of FIG. 1. [Figure 9] FIG. 2 is a bottom view of the top plate of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION

[0021] The implementation of the present invention is illustrated below by specific embodiments. Those skilled in the art will readily appreciate other advantages and benefits of the present invention from the disclosure herein.

[0022] It should be noted that the structures, scales, sizes, etc. shown in the accompanying drawings of this specification are used solely for the purpose of understanding and reading by those skilled in the art in conjunction with the contents disclosed herein, and are not intended to define the conditions for implementing the present invention, nor are they technically significant. Any structural modifications, proportional changes, or size adjustments that do not affect the effects or purposes that can be achieved by the present invention are considered to be within the scope of the technical content disclosed in this specification. Furthermore, terms such as "upper," "lower," "left," "right," "center," and "one side" used in this specification are used solely for the convenience of explanation and are not used to limit the scope of the present invention. Changes or adjustments to the relative relationships without substantially changing the technical content are also considered to be within the scope of the present invention.

[0023] 1 to 4, in some embodiments, the present invention provides a box body 1 and an upper Lid and In addition to the above components, the battery pack may include a cell 5 and / or an explosion-proof valve 4.

[0024] 1 to 4 , in some embodiments, a box 1 has a cell mounting chamber 11 and an exhaust chamber 12, and a cell 5 is mounted in the cell mounting chamber 11. An upper cover 2 covers the box 1 and is provided with a gas-solid separation channel 221, which is used to centrifuge particulate matter and gas in the flue gas passing through it. An inlet 222 of the gas-solid separation channel 221 communicates with the cell mounting chamber 11, and an outlet 223 of the gas-solid separation channel 221 communicates with the exhaust chamber 12.

[0025] Optionally, the box 1 has a chamber, and a partition 3 is attached within the chamber. The partition 3 separates the chamber into a cell mounting chamber 11 and an exhaust chamber 12. Furthermore, the cell mounting chamber 11 and the exhaust chamber 12 communicate with each other only through the gas-solid separation channel 221 when the top cover 2 covers the box 1. That is, the top cover 2 can cover the upper opening of the chamber to prevent the smoke gas in the cell mounting chamber 11 from directly entering the exhaust chamber 12. In this way, the smoke gas in the cell mounting chamber 11 must pass through the gas-solid separation channel 221 for gas-solid separation before entering the exhaust chamber 12. Furthermore, two partitions 3 may be present, and the two partitions are spaced apart in the longitudinal direction of the box 1 to separate the two exhaust chambers 12. The cell mounting chamber 11 may be located between the two exhaust chambers 12, and the gas-solid separation channels 221 of the top cover 2 may be arranged to correspond one-to-one with the exhaust chambers 12. Of course, the number of gas-solid separation channels 221 and exhaust chambers 12 may be adjusted as needed. For example, each exhaust chamber 12 corresponds to a plurality of gas-solid separation channels 221. Here, the length direction of the box 1 may be the X direction in the figure.

[0026] Optionally, an explosion-proof valve 4 is attached to the box 1 and is used to exhaust gas in the exhaust chamber 12 when it is in an open state. Furthermore, the explosion-proof valve 4 is attached to the side wall of the box 1. When the explosion-proof valve 4 is in an open state, the exhaust chamber 12 communicates with the outside of the box 1, and the gas in the exhaust chamber 12 can be exhausted to the outside of the box 1 through the explosion-proof valve 4.

[0027] Optionally, mica patches and mica wings are evenly distributed on the top surface of the cells 5 to protect the cells 5 and prevent hot smoke gases from igniting adjacent cells 5.

[0028] In the battery pack provided by this embodiment, the gas-solid separation channel 221 is directly provided in the top cover 2, so that the gas and particulate matter in the high-temperature smoke gas are separated, and the particulate matter remains within the battery pack. This prevents the particulate matter from being ejected outside the battery pack and causing a fire outside the battery pack, improving safety performance. Furthermore, there is no need to provide a separate gas-solid separation member, reducing the number of parts and simplifying the structure. The gas-solid separation channel 221 uses centrifugal force to separate the particulate matter and gas, preventing filter clogging and ensuring reliable gas-solid separation.

[0029] 1-4, in some optional embodiments, the gas-solid separation channels 221 are located in the same plane.

[0030] Optionally, the plane on which the gas-solid separation channel 221 is located is perpendicular to the height direction of the box 1. Here, the height direction of the box 1 may be the vertical direction, i.e., the Z direction in the figure. That is, the gas-solid separation channel 221 may be located on a horizontal plane.

[0031] Optionally, the top cover 2 and the box 1 are arranged in the Z direction.

[0032] In the battery pack provided by this embodiment, the gas-solid separation channel 221 is flush with the to In particular, the arrangement on the same horizontal plane can reduce the space occupied in the height direction of the box 1, thereby reducing the overall volume of the battery pack.

[0033] 1 to 9, in some optional embodiments, the top cover 2 includes an upper plate 21, a lower plate 24, and a channel assembly sandwiched between the upper plate 21 and the lower plate 24. 2 1 is disposed on the flow path assembly board. The lower plate 24 faces the box body 1, i.e., the lower plate 24 is located between the flow path assembly board and the box body 1. Furthermore, an exhaust structure 241 is provided in the area of ​​the lower plate 24 that covers the cell mounting chamber 11, and the exhaust structure 241 communicates with the air inlet 222. Here, the exhaust structure 241 may be a through groove that penetrates the lower plate 24 in the Z direction.

[0034] Optionally, the channel assembly includes a stacked channel plate 22 and a buffer plate 23, with the channel plate 22 positioned between the upper plate 21 and the buffer plate 23. That is, the upper plate 21, channel plate 22, buffer plate 23, and lower plate 24 may be stacked in order from top to bottom in the Z direction. Here, a channel groove is disposed on the side of the channel plate 22 facing the buffer plate 23. The buffer plate 23 is connected to the channel plate 22, covers the channel groove, and together with the channel groove, defines a gas-solid separation channel 221. The outlet end of the channel groove penetrates the side of the channel plate 22 facing the upper plate 21 to form an outlet port 223. The buffer plate 23 is provided with a first vent hole 232 penetrating the buffer plate 23, which overlaps at least a portion of the inlet end of the channel groove to define the outlet port 222. The use of this structural design simplifies and facilitates processing, reduces production and processing difficulties, and contributes to improving production efficiency and product quality.

[0035] Optionally, a buffer chamber 231 is disposed on the side of the buffer plate 23 facing the lower plate 24 to cover the exhaust structure 241. The inlet end of the first vent 232 penetrates the inner wall of the buffer chamber 231 to communicate with the buffer chamber 231. After the smoke gas in the cell mounting chamber 11 is exhausted through the exhaust structure 241, the smoke gas first enters the buffer chamber 231 for buffering, and the flow rate of the smoke gas is reduced by the buffer chamber 231. The smoke gas with the reduced flow rate is discharged through the first vent 232 and enters the inlet end of the flow channel.

[0036] Optionally, the flow path plate 22, the buffer plate 23, and each lower plate 24 are provided with second vent holes 25 communicating with the exhaust chamber 12. A groove 211 is disposed on the side of the upper plate 21 facing the flow path plate 22 to connect the exhaust hole 223 to the second vent hole 25 of the flow path plate 22. Smoke gas in the cell mounting chamber 11 is exhausted by the exhaust structure 241, flows sequentially through the buffer chamber 231, the first vent hole 232, and the gas-solid separation channel 221, and then enters the exhaust chamber 12 through the second vent hole 25. Specifically, the smoke gas in the cell mounting chamber 11 passes through the gas-solid separation channel 221 and is discharged from the exhaust hole 223 into the groove 211. The smoke gas in the groove 211 passes sequentially through the second vent hole 25 of the flow path plate 22, the second vent hole 25 of the buffer plate 23, and the second vent hole 25 of the lower plate 24, and then enters the exhaust chamber 12. Furthermore, the groove 211 may be an "I"-shaped groove, the two ends of which correspond to the second vent holes 25, and the smoke gas can enter the corresponding second vent holes 25 from both ends of the "I"-shaped groove, thereby improving the gas exhaust efficiency.

[0037] Optionally, a mica plate 26 is disposed on the side of the lower plate 24 facing the box body 1. The mica plate 26 has high temperature resistance and fire resistance, and can protect the upper cover 2. The mica plate 26 is provided with a fragile structure 261 corresponding to the exhaust structure 241 and an opening 262 corresponding to the exhaust chamber 12. Furthermore, the fragile structure 261 may be formed by thinning a portion of the mica plate 26. Alternatively, fragile structure 261 may be a through groove that penetrates the mica plate 26 in the Z direction, and smoke gas in the cell mounting chamber 11 can be discharged through the fragile structure 261 and enter the air inlet 222.

[0038] In the battery pack provided by this embodiment, the structural layout of the top cover 2 and the housing 1 is compact, occupies less space, and reduces the overall volume of the battery pack. Furthermore, smoke gas can flow along a predetermined flow path when flowing through the top cover 2. In this way, directional exhaust is achieved, preventing the smoke gas from affecting other weak parts of the top cover 2 and reducing the risk of failure at the weak parts of the top cover 2, thereby improving the safety and reliability of the battery pack.

[0039] Referring to Figures 1, 2, 4, and 5, in some optional embodiments, the gas-solid separation channel 221 includes multiple separation channel sections connected to each other. The separation channel sections are connected end-to-end to form a spiral structure. The structure of the separation channel sections not only has a compact layout, but also allows the flue gas to move circularly as it flows through the gas-solid separation channel 221, thereby achieving separation of the gas and particulate matter. Here, the gas and particulate matter in the flue gas have different weights. The gas-solid separation channel 221 can separate the particulate matter from the gas by utilizing the difference in centrifugal force experienced by the flue gas as it moves circularly. It should be understood that the flue gas is not limited to a circular motion. For example, the separation channel sections may be connected to form a wave-like structure, and the centrifugal force of the flue gas may be used to separate the particulate matter from the gas during the continuous turning process.

[0040] Optionally, the top cover 2 has solids storage chambers 224 corresponding to the separated flow channel regions. Each solids storage chamber 224 is located outside the periphery of the separated flow channel region and is in communication with the separated flow channel region, so that particulate matter from the corresponding separated flow channel region can be stored in the corresponding solids storage chamber 224.

[0041] Optionally, the inlet 222 is located on the outer ring of the spiral structure, and the outlet 223 is located on the inner ring of the spiral structure. Furthermore, the flow cross-section of each separation channel section gradually decreases from near the inlet 222 to farther from the inlet 222. That is, the flow cross-sectional area of ​​the separation channel section near the inlet 222 is larger than the flow cross-sectional area of ​​the separation channel section farther from the inlet 222. In this way, the flow velocity of the smoke gas gradually increases from near the inlet 222 to farther from the inlet 222. Controlling the flow velocity of the smoke gas by varying the area size of the channel section is beneficial to the separation of gas and particulate matter and also reduces the possibility of particulate matter being ejected from the explosion-proof valve 4. Furthermore, the flow cross-section of the gas-solid separation channel 221 gradually decreases from the end near the inlet 222 to the end farther from the inlet 222. That is, the flow cross-sectional area of ​​each separation channel section gradually decreases from the end near the inlet 222 to the end farther from the inlet 222. The cross-sectional flow area at the junction of two adjacent separation channel sections also transitions smoothly.

[0042] Optionally, the number of separation channel sections is two. The separation channel sections include a primary separation channel section 2211 and a secondary separation channel section 2212. The hot flue gas completes a first separation into hot gas and hot particulate matter in the primary separation channel section 2211, and the hot particulate matter separated in the first separation is stored in the solid containment chamber 224 corresponding to the primary separation channel section 2211. In this step, the larger the particulate matter in the hot flue gas, i.e., the heavier the particulate matter, the more easily it can be separated. Next, the remaining hot gas and hot particulate matter enter the secondary separation channel section 2212 to complete a second separation into the hot flue gas and hot particulate matter. The hot particulate matter separated in the second separation is stored in the solid containment chamber 224 corresponding to the secondary separation channel section 2212. After this step, the separated flue gas is discharged from the gas-solid separation channel 221 through the exhaust port 223, and at this point, the separation of the gas and particulate matter in the hot flue gas is completed. It should be understood that the number of the separated flow channel sections can be set as needed, and can be one section or two or more sections, and this number is not limited to the two mentioned in this embodiment. The operation principle of the separated flow channel sections with different numbers of sections is the same, and will not be repeated here.

[0043] In the battery pack provided by this embodiment, the separation of gas and particulate matter is achieved by changing the cross-sectional area of ​​the gas-solid separation channel 221 to change the flow rate of the flue gas, and / or by centrifugal action of the flue gas, thereby preventing the particulate matter from being discharged from the battery pack together with the gas, and reducing the risk of fire caused by the particulate matter outside the battery pack.

[0044] In the battery pack provided by the present invention, the gas-solid separation channel 221 is located in the top cover 2, thereby simplifying the structure and achieving separation of gases and particulate matter in the flue gas, thereby improving the safety performance of the battery pack, reducing the cost of the battery pack, and reducing the overall volume of the battery pack.

[0045] In the description herein, the use of terms such as "this embodiment," "example," or "specific example" means that the particular feature, structure, material, or characteristic described in combination with the embodiment or example is included in at least one embodiment or example of the present invention. In the description herein, general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the particular feature, structure, material, or characteristic described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] The above-described embodiments are illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Those skilled in the art can modify or change the above-described embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical ideas disclosed in the present invention are also encompassed in the scope of the claims of the present invention. [Industrial Applicability]

[0047] The battery pack of the present invention can be applied to the field of power supply batteries. [Explanation of symbols]

[0048] 1: Box body 11: Cell mounting chamber 12: Exhaust chamber 2: Upper lid 21: Upper board 211: Groove 22: Flow path plate 221: Gas-solid separation channel 2211: Primary separation channel area 2212: Secondary separation channel area 222: Air intake 223: Exhaust port 224: Solid containment chamber 23:Buffer plate 231: Buffer room 232: First ventilation outlet 24: Lower board 241: Exhaust structure 25: Second ventilation hole 26: Mica board 261: Fragile structure 262:Aperture 3: Divider 4: Explosion-proof valve 5: Cell

Claims

1. a box having a cell mounting chamber and an exhaust chamber; an upper cover that covers the box body and has a gas-solid separation flow path; Including, The gas-solid separation channel is used to separate particulate matter and gases in the flue gas flowing through the gas-solid separation channel by centrifugal separation; an inlet of the gas-solid separation flow path communicates with the cell mounting chamber, and an exhaust port of the gas-solid separation flow path communicates with the exhaust chamber; Battery pack.

2. The gas-solid separation channels are located in the same plane; The battery pack according to claim 1 .

3. the plane on which the gas-solid separation channel is located is perpendicular to the height direction of the box body, and the upper cover and the box body are arranged in the height direction of the box body. The battery pack according to claim 2 .

4. the gas-solid separation channel includes a plurality of separation channel sections that are in communication with each other; the plurality of separated flow channel sections are connected end to end in sequence to form a spiral structure; The battery pack according to any one of claims 1 to 3.

5. the upper cover has solid storage chambers corresponding to the separation channel regions, Each of the solids containment chambers is located outside the periphery of the corresponding separation channel section and is in communication with the corresponding separation channel section. The battery pack according to claim 4.

6. The air inlet is located on the outer ring of the spiral structure, and the air outlet is located on the inner ring of the spiral structure; the flow cross section of each separated flow channel section decreases sequentially from near the inlet to far from the inlet; The battery pack according to claim 4.

7. The flow cross section of the gas-solid separation channel gradually decreases from the end close to the inlet port to the end far from the inlet port. The battery pack according to claim 6.

8. the upper cover includes an upper plate, a lower plate, and a flow path assembly plate sandwiched between the upper plate and the lower plate, The gas-solid separation channel is disposed on the channel assembly; the lower plate faces the box body, and an exhaust structure is disposed in a region of the lower plate that covers the cell mounting chamber; the exhaust structure is in communication with the air inlet; The battery pack according to claim 1 .

9. the flow path assembly plate includes a flow path plate and a buffer plate that are stacked, the flow path plate is located between the upper plate and the buffer plate, and a flow path groove is arranged on the side of the flow path plate facing the buffer plate; the buffer plate is connected to the flow path plate, covers the flow path groove, and defines the gas-solid separation flow path together with the flow path groove; an exhaust end of the flow channel penetrates a side of the flow channel plate facing the upper plate to form the exhaust port; a first vent hole extending through the buffer plate, the first vent hole overlapping at least a portion of the inlet end of the flow channel to define the inlet; The battery pack according to claim 8.

10. a buffer chamber is disposed on the side of the buffer plate facing the lower plate so as to cover the exhaust structure; an inlet end of the first ventilation port penetrates an inner wall of the buffer chamber to communicate with the buffer chamber; The battery pack according to claim 9.

11. a second vent hole communicating with the exhaust chamber is provided in each of the flow path plate, the buffer plate, and the lower plate; a groove is arranged on the side of the upper plate facing the flow path plate to connect the exhaust port to the second vent port of the flow path plate; The smoke gas in the cell mounting chamber is discharged by the exhaust structure, flows through the buffer chamber, the first vent, and the gas-solid separation channel in this order, and then enters the exhaust chamber through the second vent. The battery pack according to claim 10.

12. a mica plate is disposed on the side of the lower plate facing the box body, and the mica plate is provided with a fragile structure corresponding to the exhaust structure and an opening corresponding to the exhaust chamber; The battery pack according to claim 8.

13. The box has a chamber, and a partition is attached within the chamber; the partition divides the chamber into the cell mounting chamber and the exhaust chamber; the cell mounting chamber and the exhaust chamber are communicated with each other only by the gas-solid separation channel when the upper lid covers the box body. The battery pack according to claim 1 .

14. Explosion-proof valve Further comprising: The explosion-proof valve is attached to the box body and is used to discharge gas within the exhaust chamber when in an open state. The battery pack according to claim 1 .

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