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 sources, and more particularly to battery packs. [Background technology]

[0002] Lithium-ion batteries are widely used in various fields such as transportation and energy storage. Generally, lithium cells are connected in series, parallel, or a combination of series and parallel to form a group to meet the requirements of use. However, the cells are prone to thermal runaway under mechanical, electrical, and thermal abuse, either alone or in combination. The main symptoms of a cell experiencing thermal runaway are a series of internal chain reactions and a sudden rise in temperature. The decomposition and regeneration of the solid electrolyte interface (SEI) film and the vaporization of the electrolyte cause the internal pressure of the cell to increase. When the internal pressure of the cell reaches the opening pressure of the cell safety valve, the cell will release a large amount of gas and particulate matter. The particulate matter here includes liquid droplets, nickel oxide, and copper foil, and the gas and particulate matter are discharged outside the battery pack through the explosion-proof valve. The hot particulate matter discharged along with the gas may ignite the hot smoke gas and cause a fire outside the battery pack, which may seriously threaten the safety of 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, the use of a filter to block hot particles has many drawbacks. After a thermal runaway occurs in a cell, a large amount of material will erupt from the cell, especially when the thermal runaway is widespread. If the filter pore size is too small, the filter will be easily clogged and the exhaust of the battery pack will be poor, and if the filter pore size is too large, the filter will not be able to block hot particles.

[0004] In view of the above-mentioned shortcomings in the related art, the present invention provides a battery pack aimed at solving the problem 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, and improving the safety performance of the battery pack. [Means for solving the problem]

[0005] In order 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 centrifuge particulate matter and gas in the smoke gas passing therethrough. An inlet of the gas-solid separation channel communicates with the cell mounting chamber, and an exhaust port 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 helical structure.

[0009] Optionally, the top cover has solids containment chambers corresponding to the respective separated flow channel sections, each solids containment chamber being positioned outside the periphery of the corresponding separated flow channel section and in communication with the corresponding separated flow channel section.

[0010] Optionally, the inlet is located on an outer ring of the spiral and the outlet is located on an 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 proximate the inlet to an end remote from the inlet.

[0012] Optionally, the top cover includes an upper plate, a lower plate, and a flow path assembly sandwiched between the upper plate and the lower plate. The gas-solid separation flow path is disposed in the flow path 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 arranged in a stacked manner, the flow path plate being located between the upper plate and the buffer plate, and a flow groove being 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 groove, and defines a gas-solid separation flow path together with the flow groove. An 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, and the first air vent overlaps with at least a portion of the inlet end of the flow path 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. 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 are each provided with a second vent hole communicating with the exhaust chamber. A groove is arranged on the side of the upper plate facing the flow path plate to communicate the exhaust hole with the second vent hole of the flow path plate. The smoke gas in the cell mounting chamber is exhausted by the exhaust structure, flows through the buffer chamber, the first vent hole, the gas-solid separation flow path in order, and then enters the exhaust chamber through the second vent hole.

[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 is 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 by the gas-solid separation passage 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 gas within the exhaust chamber when in an open state. Effect of the Invention

[0019] As mentioned above, the beneficial effects provided by the battery pack of the present invention include: By directly arranging the gas-solid separation channel on the upper plate, the separation of gas and particulate matter in the flue gas is achieved, and there is no need to arrange a separate gas-solid separation member. In this way, the structure is simplified and the cost is reduced. Moreover, the gas-solid separation channel uses centrifugal force to separate the particulate matter and gas in the flue gas flow. In this way, a good separation effect is provided, clogging is less likely to occur, and the safety performance of the battery pack is improved. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is an exploded view of a battery pack according to one embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of an exhaust path of the battery pack of FIG. [Diagram 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. [Diagram 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. 1. [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. [Figure 9] FIG. 2 is a bottom view of the upper plate of FIG. 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] The implementation of the present invention is illustrated below by specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the disclosure of this specification.

[0022] It should be noted that the structures, scales, sizes, etc. shown in the accompanying drawings of this specification are used only in conjunction with the contents disclosed in this specification for those skilled in the art to understand and read, are not intended to define the conditions for implementing the present invention, and have no technical significance. Any structural modification, proportional relationship change, or size adjustment that does not affect the effects and objects that can be achieved by the present invention is considered to be within the scope of the technical content disclosed in this specification. In addition, terms such as "upper", "lower", "left", "right", "center", and "one side" described in this specification are used only for the convenience of explanation and are not used to limit the scope of application of the present invention. A change or adjustment of the relative relationship without substantially changing the technical content is also considered to be within the scope of application of the present invention.

[0023] Referring to FIG. 1 to FIG. 4, in some embodiments, the present invention includes 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, the box 1 has a cell mounting chamber 11 and an exhaust chamber 12, and the cell 5 is mounted in the cell mounting chamber 11. The top 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 therethrough. An inlet 222 of the gas-solid separation channel 221 communicates with the cell mounting chamber 11, and an exhaust port 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 in 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 needs to pass through the gas-solid separation channel 221 for gas-solid separation before entering the exhaust chamber 12. Furthermore, there may be two partitions 3, and the two partitions are spaced apart in the length 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 channel 221 of the top cover 2 may be arranged to correspond one-to-one to the exhaust chambers 12. Of course, the number of gas-solid separation channels 221 and exhaust chambers 12 may be adjusted as necessary. 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 in an open state. Furthermore, the explosion-proof valve 4 is attached to a 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 passage 221 is directly provided on the top cover 2, so that the gas and particulate matter in the high-temperature smoke gas are separated, and the particulate matter remains in the battery pack. In this way, the particulate matter is prevented from being ejected outside the battery pack and causing a fire outside the battery pack, and safety performance is improved. Furthermore, there is no need to separately arrange a gas-solid separation member, so the number of parts is reduced and the structure is simplified. The gas-solid separation passage 221 uses centrifugal force to separate the particulate matter and the gas, which prevents filter clogging and ensures the reliability of 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, that is, 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 upper 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 an area of ​​the lower plate 24 covering 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 penetrating the lower plate 24 in the Z direction.

[0034] Optionally, the channel assembly includes a channel plate 22 and a buffer plate 23 stacked together, and the channel plate 22 is located between the upper plate 21 and the buffer plate 23. That is, the upper plate 21, the channel plate 22, the buffer plate 23, and the 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 defines a gas-solid separation channel 221 together with the channel groove. The exhaust end of the channel groove penetrates the side of the channel plate 22 facing the upper plate 21 to form an exhaust port 223. The buffer plate 23 is provided with a first vent hole 232 that penetrates the buffer plate 23, and the first vent hole 232 overlaps at least a part of the inlet end of the channel groove to define the exhaust port 222. The use of this structural design simplifies and facilitates processing, reduces the difficulty of production and processing, 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 ventilation port 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 from 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 exhausted from the first ventilation port 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 a second vent 25 communicating with the exhaust chamber 12. A groove 211 is arranged on the side of the upper plate 21 facing the flow path plate 22 to communicate the exhaust port 223 with the second vent 25 of the flow path plate 22. The smoke gas in the cell mounting chamber 11 is exhausted by the exhaust structure 241, flows through the buffer chamber 231, the first vent 232, and the gas-solid separation flow path 221 in order, and then enters the exhaust chamber 12 through the second vent 25. Specifically, the smoke gas in the cell mounting chamber 11 passes through the gas-solid separation flow path 221 and is exhausted from the exhaust port 223 into the groove 211. The smoke gas in the groove 211 passes through the second vent 25 of the flow path plate 22, the second vent 25 of the buffer plate 23, and the second vent 25 of the lower plate 24 in order, 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 vents 25, and the smoke gas can enter the corresponding second vents 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 part of the mica plate 26. Alternatively, fragile structure Reference numeral 261 may be a through groove penetrating the mica plate 26 in the Z direction, and the 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 box 1 is compact, occupies less space, and reduces the overall volume of the battery pack. Furthermore, the smoke gas can follow a predetermined flow path when flowing through the top cover 2. In this way, directional exhaust is achieved, the smoke gas is prevented from affecting other weak parts of the top cover 2, the risk of failure at the weak parts of the top cover 2 is reduced, and the safety and reliability of the battery pack is improved.

[0039] 1, 2, 4, and 5, in some optional embodiments, the gas-solid separation channel 221 includes a plurality of separation channel sections that communicate with each other. The separation channel sections are connected end-to-end to form a spiral structure in turn. The structure of the separation channel sections is not only compact in layout, but also allows the smoke gas to make a circular motion when flowing through the gas-solid separation channel 221, so that separation of the gas and the particulate matter is achieved. Here, the gas and the particulate matter in the smoke gas have different weights. The gas-solid separation channel 221 can separate the particulate matter and the gas by utilizing the difference in the centrifugal force experienced by the gas when the smoke gas makes a circular motion. It should be understood that the smoke gas is not limited to a circular motion. For example, the separation channel sections can be connected to form a wave-like structure, and the centrifugal force of the smoke gas can be used to separate the particulate matter and the gas during the successive turning processes.

[0040] Optionally, the top cover 2 has solids storage chambers 224 corresponding to the separated flow areas. Each solids storage chamber 224 is located outside the periphery of the separated flow area and is in communication with the separated flow area, so that particulate matter from the corresponding separated flow area 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 decreases from near the inlet 222 to far from the inlet 222. That is, the area of ​​the flow cross section of the separation channel section near the inlet 222 is larger than the area of ​​the flow cross section of the separation channel section far from the inlet 222. In this way, the flow velocity of the smoke gas increases gradually from the direction near the inlet 222 to the direction far from the inlet 222. Controlling the flow velocity of the smoke gas by changing 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 decreases gradually from the end near the inlet 222 to the end far from the inlet 222. That is, the area of ​​the flow cross section of each separation channel section decreases gradually from the end near the inlet 222 to the end far from the inlet 222. There is also a smooth transition in the cross-sectional flow area at the junction of two adjacent separation channel sections.

[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 smoke gas completes the first separation of the hot gas and the 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 storage chamber 224 corresponding to the primary separation channel section 2211. In this step, the larger the particulate matter in the hot smoke gas, that is, the heavier the particulate matter, the more it can be separated. Then, the remaining hot gas and hot particulate matter enter the secondary separation channel section 2212 to complete the second separation of the hot smoke gas and the hot particulate matter. The hot particulate matter separated in the second separation is stored in the solid storage chamber 224 corresponding to the secondary separation channel section 2212. After this step, the separated smoke gas is discharged from the gas-solid separation channel 221 by the exhaust port 223, and at this point, the separation of the gas and particulate matter in the hot smoke gas is completed. It should be understood that the number of the separated flow passage sections can be set as required, and can be one section or two or more sections, and the number is not limited to the two mentioned in this embodiment. The operation principle of the separated flow passage 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 flow cross-sectional area of ​​the gas-solid separation channel 221 to change the flow velocity of the flue gas, and / or the separation of gas and particulate matter is achieved by the centrifugal action of the flue gas, thus 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 arranged in the top cover 2, and the gas and particulate matter in the flue gas are achieved while simplifying the structure, thus 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 of this specification, the use of terms such as "the present embodiment", "example", and "specific example" means that the specific 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 this specification, general expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific feature, structure, material, or characteristic described can 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 may 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 included 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 room 12: Exhaust chamber 2: Upper lid 21: Top board 211: Groove 22: Flow path plate 221: Gas-solid separation channel 2211: Primary separation channel area 2212: Secondary separation channel area 222: Air inlet 223: Exhaust port 224: Solid containment chamber 23:Buffer plate 231: Buffer room 232: First ventilation hole 24: Lower board 241: Exhaust structure 25: Second ventilation hole 26: Mica plate 261: Fragile structure 262:Aperture 3: Partition 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 passage is used to centrifuge particulate matter and gas in the flue gas flowing through the gas-solid separation passage; 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. 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 top cover has solid containment chambers corresponding to the respective separation channel regions; Each of the solids containment chambers is located outside the periphery of a corresponding one of the separated flow passage sections and communicates with the corresponding one of the separated flow passage sections. 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 successively 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 an end close to the inlet port to an 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 plate, the lower plate faces the box body, and an exhaust structure is disposed in a region of the lower plate covering 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; the buffer plate is provided with a first vent hole passing 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, The inlet end of the first ventilation port penetrates the inner wall of the buffer chamber so as 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 so as to communicate the exhaust port with 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 passage in 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 through the gas-solid separation flow path 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 exhaust gas in the exhaust chamber when in an open state. The battery pack according to claim 1 .

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