Battery pack and electric equipment

Abstract

The invention discloses a battery pack and electric equipment. The battery pack comprises a first shell, a battery cell assembly, a pressure relief assembly and an exhaust part, the first shell comprises a first space and a first opening communicated with the first space. The battery cell assembly is arranged in the first space and comprises a plurality of battery cells, and each battery cell comprises a pressure relief part; the pressure relief assembly comprises a first channel located outside the first space, the first channel and the first shell are arranged in the first direction, the pressure relief assembly comprises a second opening, and the first opening and the second opening communicate with the first channel and the first space. Observed in the first direction, the first opening and the second opening are overlapped, and at least one pressure relief part is located in the first opening. The exhaust portion is configured to exhaust gas of the first passage to the outside of the battery pack. Gas generated during thermal runaway of the battery cell directly enters the first channel through the first opening and the second opening, and is exhausted out of the battery pack through the exhaust part from the first channel, so that pressure is released in time, and the safety of the battery pack is improved.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] As secondary batteries become increasingly popular in mobile device electronics and the electric vehicle market, in addition to the increasing demand for battery energy density, the safety performance of secondary batteries has also received much attention. When thermal runaway occurs, secondary batteries need to be depressurized in a timely manner. Summary of the invention

[0003] In view of this, it is necessary to provide a battery pack and electrical equipment that can release pressure in time to improve battery safety.

[0004] An embodiment of the present application provides a battery pack, including a first shell, a battery cell assembly, a pressure relief assembly and an exhaust portion. The first shell includes a first space and a first opening connected to the first space. The battery cell assembly is arranged in the first space, the battery cell assembly includes a plurality of battery cells, and the battery cell includes a pressure relief portion. The pressure relief assembly includes a first channel located outside the first space, the first channel and the first shell are arranged along a first direction, the pressure relief assembly includes a second opening, and the first opening and the second opening are connected to the first channel and the first space. When viewed along the first direction, the first opening and the second opening overlap, and at least one pressure relief portion is located at the first opening. The exhaust portion is configured to discharge the gas in the first channel to the outside of the battery pack. By arranging the pressure relief portion in the first opening along the first direction, the exhaust path is shortened, so that the gas generated when the battery cell thermal runaway directly enters the first channel through the first opening and the second opening, reducing the accumulation of gas in the first space, and is discharged from the first channel through the exhaust portion to the outside of the battery pack, timely pressure relief, and improving the safety of the battery pack.

[0005] In one or more optional embodiments above, the battery cell includes a main body, a sealing portion and an electrode terminal, the sealing portion is connected to the main body, the electrode terminal extends out of the sealing portion, and the pressure relief portion includes the sealing portion.

[0006] In one or more of the above optional embodiments, when viewed along the first direction, a sealing portion of one of the battery cells is located within a first opening, which is beneficial for pressure relief.

[0007] In one or more of the above optional embodiments, when viewed along the first direction, each sealing portion is located within the first opening, which can improve exhaust efficiency, facilitate pressure relief, and enhance safety.

[0008] In one or more optional embodiments above, the first housing includes a plurality of first openings, which are spaced apart along the second direction. When viewed along the first direction, there are a plurality of sealing portions in the first openings, which can improve exhaust efficiency, facilitate pressure relief and improve safety.

[0009] In one or more optional embodiments above, the pressure relief assembly includes a connector and a cover body. The connector is connected to the first shell, the cover body is connected to the connector to form a first channel, the second opening is provided at the connector, and the exhaust portion is provided at the cover body.

[0010] In one or more optional embodiments above, the cover body includes a base and a side surrounding the base, the side and the base form a recess, the side is connected to the connecting piece, and the exhaust portion is provided at the base.

[0011] In one or more optional embodiments above, the pressure relief assembly includes a partition, and when viewed along the first direction, the partition is located between adjacent second openings along the second direction, and the first direction is perpendicular to the second direction. After the gas enters the first channel from the second opening, the partition reduces the occurrence of gas backflow from other adjacent second openings to the first space, and reduces the occurrence of the backflow gas and the gas entering the first channel through other second openings. The collision is beneficial to pressure relief.

[0012] In one or more optional embodiments above, the pressure relief assembly includes a fire barrier located in the first channel. When viewed along the first direction, the fire barrier and the second opening are sequentially arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The fire barrier includes a first through hole layer and a second through hole layer, the first through hole layer includes a plurality of first through holes, the second through hole layer includes a plurality of second through holes, the first through holes are closer to the second opening, and at least one first through hole is larger than any second through hole. When the gas passes through the first through hole, the first through hole layer can block some of the particles in the gas, reducing the risk of sparks leaking out due to thermal runaway of the battery cell. When the gas passes through the second through hole, it can further block smaller particles in the gas, reducing the risk of sparks leaking out due to thermal runaway of the battery cell.

[0013] In one or more optional embodiments above, the fire barrier comprises a flat area and two second through-hole layers, and when viewed along the first direction, the flat area is located between the two second through-hole layers along the second direction. The flat area blocks the gas, allowing the gas to flow through the second through-hole layers to the exhaust portion, extending the path, reducing the risk of sparks generated by thermal runaway of the battery cell leaking, and particles in the gas impact the flat area, easily extinguishing the sparks.

[0014] In one or more of the above optional embodiments, the fire barrier comprises a first blocking portion extending from the flat area, and the first blocking portion is arranged between the base and the connecting member, which is conducive to further extending the pressure relief path and extinguishing the spark. Along the third direction, the projection of the exhaust portion along the first direction and the projection of the first blocking portion along the first direction are arranged at intervals, blocking the pressure relief gas and reducing the gas from being directly discharged from the exhaust portion, which is conducive to extending the pressure relief path and extinguishing the spark.

[0015] In one or more optional embodiments above, the fire barrier comprises a second barrier extending from the first barrier, and the second barrier is connected to the connector. The exhaust portion comprises an opening penetrating the base, and when viewed along the first direction, at least part of the second barrier is located at the opening, so as to reduce gas backflow and facilitate pressure relief.

[0016] In one or more optional embodiments above, the battery pack includes a circuit board, the battery cells and the circuit board are arranged along a third direction, the battery cells include electrode terminals, the electrode terminals are connected to the circuit board, and the first direction is perpendicular to the third direction. The circuit board can block the gas from flowing upward and guide the gas to the first opening, which is conducive to pressure relief.

[0017] In one or more of the above optional embodiments, a heat insulating member is provided between adjacent battery cells, and the thermal conductivity of the heat insulating member at 800°C is less than 0.05 (W / (m·K)). When a battery cell has thermal runaway, it is helpful to reduce the mutual influence between the battery cells.

[0018] In one or more optional embodiments above, the battery cell includes a main body, a sealing portion and an electrode terminal, the sealing portion is connected to the main body, and the electrode terminal extends out of the sealing portion. When viewed along the first direction, along the third direction, the thermal insulation member is lower than the sealing portion and higher than the main body, and the first direction is perpendicular to the third direction. This is further beneficial to slow down the heat conduction between adjacent battery cells and reduce the obstruction of gas flow toward the barrier.

[0019] In one or more of the above optional embodiments, the vent portion includes a waterproof breathable membrane covering the opening.

[0020] In one or more optional embodiments above, the side portion includes a first side portion and a second side portion arranged along the third direction, and the first side portion and the second side portion are connected to the connecting member. The side portion includes a third side portion and a fourth side portion arranged along the second direction, and the third side portion and the fourth side portion are connected to the connecting member. The first side portion connects the third side portion and the fourth side portion, and the second side portion connects the third side portion and the fourth side portion to form a recess.

[0021] In one or more of the above optional embodiments, the partition connects the base and the cover, and the partition isolates adjacent second openings to reduce gas flow between adjacent second openings.

[0022] In one or more of the above optional embodiments, the other opposite end of the partition is connected to the fire-blocking net and the fire-blocking member.

[0023] In one or more of the above optional embodiments, the fire-blocking member connects the third side portion and the fourth side portion, so that the depressurized gas passes through the fire-blocking member.

[0024] In one or more optional embodiments above, the fire barrier includes a third through-hole layer, the first through-hole layer and the third through-hole layer are arranged in sequence, and the third through-hole layer is located between the first through-hole layer and the second through-hole layer. The connection between the first through-hole layer and the third through-hole layer is connected to the base. The third through-hole layer includes a plurality of third through-holes, at least one first through-hole is larger than any third through-hole, and at least one third through-hole is larger than any second through-hole. The third through-hole is smaller than the first through-hole, and when the gas passes through the third through-hole, the third through-hole layer can block some of the particulate matter in the gas, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell.

[0025] An embodiment of the present application provides an electrical device, comprising the battery pack in any one of the above embodiments.

[0026] The above-mentioned battery pack and electrical equipment shorten the exhaust path by arranging the pressure relief part in the first opening along the first direction, so that the gas generated when the battery cell thermally runs away directly enters the first channel through the first opening and the second opening, reducing the accumulation of gas in the first space, and is discharged from the first channel through the exhaust part to the outside of the battery pack, thereby releasing pressure in time and improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram of the structure of a battery pack in some embodiments of the present application is shown.

[0028] Figure 2 A schematic diagram of the exploded structure of a battery pack in some embodiments of the present application is shown.

[0029] Figure 3 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0030] Figure 4 A schematic diagram of the structure of the first shell, the connecting member and the fire-blocking member in some embodiments of the present application is shown.

[0031] Figure 5 A schematic structural diagram of the first shell in some embodiments of the present application is shown.

[0032] Figure 6 A schematic structural diagram of the second shell in some embodiments of the present application is shown.

[0033] Figure 7 A schematic diagram of the structure of some battery packs in some embodiments is shown.

[0034] Figure 8 Shows Figure 1 Schematic diagram of a partial cross section along the AA direction.

[0035] Fig. 9 The schematic diagrams of the structures of the covers in some embodiments are shown.

[0036] Fig.10 Schematic diagrams of the structures of some battery packs in other embodiments are shown.

[0037] Fig.11 The schematic diagrams of the structures of the fire-blocking components in some embodiments are shown.

[0038] Fig.12 Schematic diagrams of the structures of the blocking members in some embodiments are shown.

[0039] Fig.13 A schematic structural diagram of a battery pack along a first direction viewing angle in some embodiments is shown.

[0040] Fig.14 A schematic diagram of the structure of some battery packs in some embodiments is shown.

[0041] Fig.15 A simplified schematic diagram of electrical equipment in some embodiments is shown.

[0042] Description of main component symbols: Battery Pack 100 First housing 10 First space 10a First opening 10b First Shell 11 The first shell space 11a The first side wall 111 First receiving groove 111a Second Shell 12 Second shell space 12a The second side wall 121 The second receiving groove 121a Barrier 101 Partition wall 101a Accommodating space 101b The first accommodation space 1011 The first subspace 1011a The second accommodation space 1012 Second subspace 1011b Partition 101c Battery cell assembly 20 Battery 21 Pressure relief portion 21a Main body 211 Sealing part 212 Electrode terminal 213 The first group of cells 201 The second battery cell 202 Pressure relief assembly 30 First channel 30a Second opening 30b Exhaust portion 30c Connector 31 Cover 32 Recessed portion 32a Base 321 Side 322 First side portion 3221 Second side portion 3222 The third side portion 3223 Fourth side portion 3224 Partition 33 Fire arrester 40 Sub-fire barrier 401 The first via layer 41 First through hole 411 The third via layer 42 The third through hole 421 Connecting part 43 The third opening 431 The second via layer 44 Second through hole 441a Flat area 442 The first blocking portion 45 The second blocking portion 46 Circuit board 102 Thermal insulation 103 Elastic member 104 Second housing 105 First Wall 1051 Second Wall 1052 The third wall 1053 The Fourth Wall 1054 Fifth Wall 1055 Protection board 106 Electrical equipment 200 First direction X Second direction Y The third direction Z The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.

[0044] When a component is considered to be “disposed on” another component, it can be directly disposed on the other component or there may be a component interposed therebetween. When a component is considered to be “connected to” another component, it can be directly connected to the other component or there may be a component interposed therebetween.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0046] It can be understood that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, there may be a state that is approximately perpendicular or equal to each other between the two components. For example, in combination with numerical descriptions, perpendicularity can refer to the angle between two straight lines being between 90°±10°, perpendicularity can also refer to the dihedral angle between two planes being between 90°±10°, and perpendicularity can also refer to the angle between a straight line and a plane being between 90°±10°. The two components described as "perpendicular" may not be absolute straight lines or planes, but may be roughly straight lines or planes. From a macroscopic perspective, a component can be considered a "straight line" or a "plane" if the overall extension direction is a straight line or a plane.

[0047] Unless otherwise defined, when the term "plurality" is used to describe the number of components, it specifically means that the components are two or more.

[0048] Some embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0049] See also Figures 1 to 7 An embodiment of the present application provides a battery pack 100, including a first shell 10 and a battery cell assembly 20, wherein the first shell 10 includes a first space 10a and a first opening 10b communicating with the first space 10a. The battery cell assembly 20 is disposed in the first space 10a.

[0050] In some embodiments, the battery cell assembly 20 includes a plurality of battery cells 21 , and the battery cells 21 include a pressure relief portion 21 a .

[0051] In some embodiments, the battery pack 100 includes a pressure relief assembly 30 , the pressure relief assembly 30 includes a first channel 30 a located outside the first space 10 a , and the first channel 30 a and the first housing 10 are arranged along a first direction X. The pressure relief assembly 30 is connected to the first housing 10 .

[0052] In some embodiments, the pressure relief assembly 30 includes a second opening 30b, and the first opening 10b and the second opening 30b communicate with the first channel 30a and the first space 10a. When viewed along the first direction X, the first opening 10b and the second opening 30b overlap, and at least one pressure relief portion 21a is located at the first opening 10b.

[0053] In some embodiments, the battery pack 100 includes a vent portion 30 c configured to discharge the gas of the first channel 30 a to the outside of the battery pack 100 .

[0054] In some embodiments, the outside of the battery pack 100 may be the external environment, or a space within the space where the battery pack 100 is located except the battery pack 100 itself.

[0055] The present application shortens the exhaust path by arranging the pressure relief portion 21a in the first opening 20b along the first direction X, so that the gas generated when the battery cell 21 thermally runs away directly enters the first channel 30a through the first opening 20b and the second opening 30b, thereby reducing the accumulation of gas in the first space 10a, and the gas is discharged from the first channel 30a through the exhaust portion 30c to the outside of the battery pack 100, thereby releasing the pressure in time and improving the safety of the battery pack 100.

[0056] See also Figure 2 and Figure 3 In some embodiments, the battery cell 21 includes a main body 211 , a sealing portion 212 , and an electrode terminal 213 . The sealing portion 212 is connected to the main body 211 , and the electrode terminal 213 extends out of the sealing portion 212 .

[0057] In some embodiments, the pressure relief portion 21a includes a sealing portion 212. The gas in the battery cell 21 is discharged from the sealing portion 212 and enters the first channel 30a through the first opening 20b and the second opening 30b.

[0058] In some embodiments, the battery cell 21 includes a soft-pack battery cell, and the battery cell shell of the battery cell 21 includes an aluminum-plastic film.

[0059] In some embodiments, the battery cell 21 is a hard shell battery cell, such as a square shell or cylindrical battery cell. The hard shell battery cell includes a pressure relief valve, and the pressure relief portion 21 a includes a pressure relief valve.

[0060] In some embodiments, the plurality of battery cells 21 are arranged in a first group of battery cells 201 along a second direction Y. The electrode terminals 213 of adjacent battery cells 21 are bent and connected, and the first direction X is perpendicular to the second direction Y. In some embodiments, a plurality of battery cells 21 are arranged along the second direction Y to form a second group of battery cells 202 , and the electrode terminals 213 of adjacent battery cells 21 are bent and connected.

[0061] See also Figure 3 and Fig.12In some embodiments, the battery pack 100 includes a barrier 101 , and along the second direction Y, the barrier 101 is disposed between the first group of battery cells 201 and the second group of battery cells 202 .

[0062] In some embodiments, the barrier 101 includes a partition wall 101a, and along the second direction Y, at least a portion of the projection of each sealing portion 212 is located within the projection of the partition wall 101a, which is beneficial for the partition 33 to reduce the risk of particulate matter in the thermal runaway battery cell 21 diffusing to the surface of another battery cell group and triggering thermal runaway.

[0063] In some embodiments, along the third direction Z, the partition wall 101a exceeds the sealing portion 212 of the first cell group 201, which is beneficial to reduce the mutual influence between the first cell group 201 and the second cell group 202. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0064] In some embodiments, along the third direction Z, the partition wall 101 a extends beyond the sealing portion 212 of the second battery cell group 202 , which helps to reduce the mutual influence between the first battery cell group 201 and the second battery cell group 202 .

[0065] In some embodiments, the barrier 101 has a containing space 101b, and the partition wall 101a is disposed in the containing space 101b to separate the containing space 101b into a first containing space 1011 and a second containing space 1012. The gas particles generated when the first battery cell group 201 thermally runs away can fall into the first containing space 1011, and the gas particles generated when the second battery cell group 202 thermally runs away can fall into.

[0066] In some embodiments, the barrier 101 includes a partition 101c, which is disposed in the first accommodating space 1011. The partition 101c divides the first accommodating space 1011 into a plurality of first sub-spaces 1011a, and divides the particulate matter into the plurality of first sub-spaces 1011a, thereby reducing the risk of stacking and ignition of the particulate matter in the first sub-spaces 1011a. The gas particles collide with the partition 101c, which helps to extinguish sparks on the particulate matter.

[0067] In some embodiments, the partition 101c is disposed in the second accommodating space 1012, and the partition 101c divides the second accommodating space 1012 into a plurality of second sub-spaces 1011b, and divides the particulate matter into the plurality of second sub-spaces 1011b, thereby reducing the risk of stacking and ignition of the particulate matter in the second sub-spaces 1011b, and the gas particles collide with the partition 101c, which helps to extinguish the sparks on the particulate matter.

[0068] See also Figures 2 to 6In some embodiments, the first shell 10 includes a first shell 11 and a second shell 12, the first shell 11 and the second shell 12 are arranged along the first direction X, the first shell 11 is provided with a first shell space 11a, the second shell 12 is provided with a second shell space 12a, the first shell 11 is connected to the second shell 12, and the first space 10a is formed. The battery cell assembly 20 is located in the first shell 11 and the second shell 12.

[0069] In some embodiments, the first shell 11 includes a first side wall 111, and along the first direction X, a side of the first side wall 111 facing the second shell 12 is provided with a plurality of first receiving grooves 111a, and the plurality of first receiving grooves 111a are arranged along the second direction Y, and each first receiving groove 111a extends along the third direction Z. Along the first direction X, one side of the main body 211 is disposed in the first receiving groove 111a, and the position of the battery cell 21 is limited along the second direction Y, so that the pressure relief portion 21a is disposed in the first opening 20b along the first direction X, which is conducive to pressure relief.

[0070] In some embodiments, the second shell 12 includes a second side wall 121, and the first side wall 111 and the second side wall 121 are arranged along the first direction X. Along the first direction X, a plurality of second receiving grooves 121a are provided on the side of the second side wall 121 facing the first shell 11, and the plurality of second receiving grooves 121a are arranged along the second direction Y, and each second receiving groove 121a extends along the third direction Z. Along the first direction X, the other side of the main body 211 of the same battery cell 21 is arranged in the second receiving groove 121a, and the position of the battery cell 21 is limited along the second direction Y, so that the pressure relief portion 21a is arranged in the first opening 10b along the first direction X, which is further conducive to pressure relief.

[0071] Optionally, one side of the main body 211 of a battery cell 21 is disposed in a first receiving groove 111 a , and the other side of the main body 211 of the same battery cell 21 is disposed in a second receiving groove 121 a .

[0072] Optionally, one side of the main body 211 of the two battery cells 21 is disposed in a first receiving groove 111 a , and the other side of the main body 211 of the same two battery cells 21 is disposed in a second receiving groove 121 a .

[0073] In some embodiments, the main body 211 is bonded into the first receiving groove 111 a.

[0074] In some embodiments, the main body 211 is bonded into the second receiving groove 121 a.

[0075] See also Figures 2 to 7 and Fig.10 In some embodiments, when viewed along the first direction X, each sealing portion 212 is located within the first opening 10 b , which can improve exhaust efficiency, facilitate pressure relief, and improve safety.

[0076] In some embodiments, the first housing 10 includes a plurality of first openings 10b, and the plurality of first openings 10b are arranged at intervals along the second direction Y. When viewed along the first direction X, a plurality of sealing portions 212 are provided in the first opening 10b, for example, two sealing portions 212 are located in the same first opening 10b. In other embodiments, the first housing includes one first opening 10b, and when viewed along the first direction X, all the sealing portions 212 are located in the first opening 10b.

[0077] please Figure 7 and Fig.10 , observed along the first direction X, each sealing portion 212 of two adjacent battery cells 21 along the second direction Y is located in one first opening 10b. For example, observed along the first direction X, at least part of each sealing portion 212 of the first battery cell 21 and the second battery cell 21 is located in one first opening 10b, and each sealing portion 212 of the third battery cell 21 and the fourth battery cell 21 is located in another adjacent first opening 10b.

[0078] In some embodiments, the first openings 10b correspond to the sealing portions 212 one by one. When viewed along the first direction X, the sealing portion 212 of one battery cell 21 is located in one first opening 10b. In other embodiments, when viewed along the first direction X, three sealing portions 212 are located in the same first opening 10b.

[0079] See also Figure 2 , Figure 4 and Figures 7 to 9 In some embodiments, the pressure relief assembly 30 includes a connecting member 31, and the connecting member 31 is connected to the first housing 10. The second opening 30b is provided on the connecting member 31, and the second opening 30b passes through the connecting member 31 along the first direction X.

[0080] See also Figure 7 In some embodiments, when viewed along the first direction X, the second opening 30b completely overlaps with the first opening 10b.

[0081] In some embodiments, viewed along the first direction X, the first opening 10 b is located inside the second opening 30 b.

[0082] See also Figure 7 In some embodiments, when viewed along the first direction X, the sealing portion 212 is exposed at both the second opening 30 b and the first opening 10 b , which is beneficial to improving the exhaust efficiency.

[0083] In some embodiments, the pressure relief assembly 30 includes a plurality of second openings 30 b , and the number of the second openings 30 b is the same as the number of the first openings 10 b .

[0084] In some embodiments, the pressure relief assembly 30 includes a cover 32, which is connected to the connector 31 to form a first channel 30a. The exhaust portion 30c is provided on the cover 32. Optionally, along the first direction X, the cover 32 is fixed to a side of the connector 31 away from the first shell 11.

[0085] In some embodiments, the cover 32 includes a base 321 , and the base 321 and the connecting member 31 are spaced apart along the first direction X. The exhaust portion 30 c is disposed at the base 321 .

[0086] In some embodiments, the vent portion 30c includes an opening penetrating the base 321, and the vent portion 30c communicates with the first channel 30a and the external environment of the battery pack 100. Optionally, the vent portion 30c includes a waterproof and breathable membrane covering the opening. In other embodiments, the vent portion 30c includes a pressure relief valve fixed to the base 321.

[0087] In some embodiments, the cover 32 includes a side portion 322 surrounding the base 321 , the side portion 322 and the base 321 form a recess 32 a , and the side portion 322 is connected to the connector 31 to form a first channel 30 a .

[0088] In some embodiments, the side portion 322 directly abuts against the connector 31 .

[0089] In some embodiments, a seal is provided between the side portion 322 and the connector 31 along the first direction X to allow gas to be discharged from the first channel 30 a , thereby reducing the possibility that particulate matter generated by thermal runaway of the battery cell 21 is carried to the external space by the gas through the gap between the side portion 322 and the connector 31 .

[0090] In some embodiments, the side portion 322 includes a first side portion 3221 and a second side portion 3222 arranged along the third direction Z, and the first side portion 3221 and the second side portion 3222 are connected to the connector 31 .

[0091] In some embodiments, the side portion 322 includes a third side portion 3223 and a fourth side portion 3224 arranged along the second direction Y, and the third side portion 3223 and the fourth side portion 3224 are connected to the connector 31. The first side portion 3221 connects the third side portion 3223 and the fourth side portion 3224, and the second side portion 3222 connects the third side portion 3223 and the fourth side portion 3224 to form a recess 32a.

[0092] In some embodiments, see Fig.13 , observed along the first direction X, along the third direction Z, the exhaust portion 30c is located at an end of the base 321 away from the second side portion 3222, which is beneficial to extend the path of the first channel 30a and reduce the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0093] See also Figures 7 to 10In some embodiments, the pressure relief assembly 30 includes a partition 33, and the partition 33 is disposed between adjacent second openings 30b along the second direction Y when viewed along the first direction X. After the gas enters the first channel 30a from the second opening 30b, the partition 33 reduces the occurrence of gas backflow from other adjacent second openings 30b to the first space 10a, and reduces the occurrence of the backflow gas and the gas entering the first channel 30a through other second openings 30b. This is beneficial to pressure relief.

[0094] In some embodiments, the pressure relief assembly 30 includes a plurality of partitions 33, and a partition 33 is provided between each of the adjacent second openings 30b. In other embodiments, a partition 33 is provided between the adjacent second openings 30b.

[0095] In some embodiments, the partition 33 connects the base 321 and the cover 32. The partition 33 isolates adjacent second openings 30b and reduces the gas flow between adjacent second openings 30b.

[0096] See also Figure 4 , Figures 7 and 8 , Fig.10 and Fig.11 In some embodiments, the battery pack 100 includes a flame barrier 40 located in the first channel 30 a.

[0097] In some embodiments, see Fig.14 , one end of the partition 33 is connected to the second side portion 3222, and part of the fire-blocking member 40 is located between adjacent partitions 33, which is conducive to the partition 33 further reducing the gas flow between adjacent second openings 30b, and the decompressed gas flows from the second opening 30b to the fire-blocking member 40, which is conducive to reducing the pressure release. In other embodiments, the other opposite end of the partition 33 is connected to the fire-blocking member 40.

[0098] In some embodiments, see Fig.14 The fire-blocking member 40 connects the third side portion 3323 and the fourth side portion 3324 , so that the depressurized gas passes through the fire-blocking member 40 .

[0099] In some embodiments, the partition 33 is integrally provided with the connecting member 31 .

[0100] In some embodiments, the partition 33 is integrally formed with the cover 32 .

[0101] See also Figures 7 and 8 , Fig.10 and Fig.11In some embodiments, when viewed along the first direction X, the fire-blocking member 40 and the second opening 30b are sequentially arranged along the third direction Z. The fire-blocking member 40 includes a first through-hole layer 41, and the first through-hole layer 41 includes a plurality of first through-holes 411. Gas passes through the first through-holes 411. The first through-hole layer 41 can block part of the particles in the gas, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0102] In some embodiments, the fire barrier 40 includes a second through hole layer 44, the second through hole layer 44 includes a plurality of second through holes 441a, and at least one first through hole 411 is larger than any second through hole 441a. The first through hole 441 is closer to the second opening 30b than the second through hole 441a. When the gas passes through the second through hole 441a, it can further block smaller particles in the gas, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0103] In some embodiments, the angle formed by the first through-hole layer 41 and the second through-hole layer 44 is an obtuse angle, which is beneficial to reducing the distance between the connector 31 and the base 321 along the first direction X, thereby increasing the gas flow rate, and is beneficial to increasing the contact area between the first through-hole layer 41 and the second through-hole layer 44 and the gas, thereby improving the pressure relief efficiency.

[0104] In some embodiments, the fire barrier 40 includes a third through hole layer 42, the first through hole layer 41 and the third through hole layer 42 are sequentially arranged, and the third through hole layer 42 is located between the first through hole layer 41 and the second through hole layer 44. The connection between the first through hole layer 41 and the third through hole layer 42 is connected to the base 321.

[0105] In some embodiments, the third through hole layer 42 includes a plurality of third through holes 421, at least one first through hole 411 is larger than any third through hole 421, and at least one third through hole 421 is larger than any second through hole 441a. Since the third through hole 421 is smaller than the first through hole 411, when the gas passes through the third through hole 421, the third through hole layer 42 can block some particles in the gas, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0106] In some embodiments, the first via layer 41 , the third via layer 42 and the second via layer 44 are sequentially arranged. The connection between the third via layer 42 and the second via layer 44 is connected to the connector 31 .

[0107] In some embodiments, the fire-blocking member 40 includes a connecting portion 43, and along the third direction Z, the connecting portion 43 is located on a side of the first through-hole layer 42 close to the second opening 30b, and the connection between the connecting portion 43 and the first through-hole layer 42 is connected to the connecting member 31. The connecting portion 43 is provided with a third opening 431, and part of the partition 33 is provided at the third opening 431, so as to facilitate the positioning of the fire-blocking member 40.

[0108] See also Figure 7 In some embodiments, the fire barrier 40 includes two sub-fire barrier members 401 arranged along the second direction Y, which facilitates the installation of the fire barrier 40.

[0109] See also Fig.10 In some embodiments, the fire-blocking member 40 is provided as an integral structure.

[0110] See also Figure 7 and Fig.10 In some embodiments, the fire-blocking member 40 includes a flat area 442 and two second through-hole layers 44. When viewed along the first direction X, the flat area 442 is located between the two second through-hole layers 44 along the second direction Y. The flat area 442 blocks the gas, allowing the gas to flow through the second through-hole layers 44 to the exhaust portion 30c, extending the path, reducing the risk of sparks generated by thermal runaway of the battery cell 21 leaking out, and particles in the gas impact the flat area 442, which can easily extinguish the sparks.

[0111] In some embodiments, the flat area 442 is closer to the middle battery cell 21 , which helps to alleviate the thermal runaway of the battery cell 21 in the middle position and reduce the risk of spark leakage caused by the thermal runaway of the battery cell 21 .

[0112] In some embodiments, the angle formed by the first through-hole layer 41 and the second through-hole layer 44 is an obtuse angle, which is beneficial to reducing the distance between the connector 31 and the base 321 along the first direction X, thereby increasing the gas flow rate, and is beneficial to increasing the contact area between the first through-hole layer 41 and the second through-hole layer 44 and the gas, thereby improving the pressure relief efficiency.

[0113] See also Figure 8 In some embodiments, the fire barrier 40 includes a first blocking portion 45, which is formed by extending from the flat area 442. The first blocking portion 45 is disposed between the base 321 and the connector 31, which is beneficial for further extending the pressure relief path and extinguishing sparks.

[0114] In some embodiments, along the third direction Z, the projection of the exhaust portion 30c along the first direction X and the projection of the first blocking portion 45 along the first direction X are spaced apart to block the depressurized gas and reduce the gas directly discharged from the exhaust portion 30c, which is beneficial to extending the depressurization path and extinguishing sparks.

[0115] In some embodiments, the fire blocking member 40 includes a second blocking portion 46 extending from the first blocking portion 45. The second blocking portion 46 is connected to the connecting member 31.

[0116] See also Fig.13 In some embodiments, the exhaust portion 30c includes an opening that penetrates the cover body 32. When viewed along the first direction X, at least a portion of the second blocking portion 46 is located at the opening, which reduces gas backflow and facilitates pressure relief.

[0117] See also Figure 3 In some embodiments, the battery pack 100 includes a circuit board 102, the battery cells 21 and the circuit board 102 are arranged along the third direction Z, and the electrode terminals 213 are connected to the circuit board 102. The circuit board 102 can block the gas from flowing upward and guide the gas to the first opening 10b, which is conducive to pressure relief.

[0118] Optionally, the circuit board 102 includes a BMS component (Battery Management System), which includes multiple electronic components. The multiple electronic components can realize functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell 21.

[0119] Optionally, the circuit board 102 includes a flexible printed circuit (FPC). Optionally, the circuit board 102 includes a printed circuit board (PCB).

[0120] See also Figure 3 In some embodiments, the battery pack 100 includes a heat insulator 103, which is disposed between adjacent battery cells 21, and is helpful in slowing down the heat conduction between adjacent battery cells 21. The thermal conductivity of the heat insulator 103 at 800°C is less than 0.05 (W / (m·K)), which is helpful in reducing the mutual influence between the battery cells 21 when thermal runaway occurs in the battery cells 21.

[0121] Optionally, the battery pack 100 includes a plurality of heat insulating members 103 , and a heat insulating member 103 is disposed between each of adjacent battery cells 21 . Optionally, a heat insulating member 103 is disposed between some of the adjacent battery cells 21 .

[0122] In some embodiments, the thermal insulation 103 includes aerogel. The thermal conductivity of aerogel at 800° C. is less than 0.04 (W / (m·K)).

[0123] In some embodiments, see Figure 7 and Fig.10 , observed along the first direction X, along the third direction Z, the thermal insulation member 103 is lower than the sealing portion 212 and higher than the main body 211 , which is further beneficial to slow down the heat conduction between adjacent battery cells 21 and reduce the obstruction of gas flow toward the barrier member 101 .

[0124] In some embodiments, the battery pack 100 includes an elastic member 104, and the battery cell assembly 20 is disposed between two elastic members 104 along the second direction Y. The elastic member 104 provides expansion space and pre-pressure for the battery cell 21. Optionally, the elastic member 104 includes foam.

[0125] In some embodiments, the battery pack 100 includes a second shell 105, and the second shell 105 includes a first wall 1051, a second wall 1052 and a third wall 1053 arranged along a second direction Y, and a fourth wall 1054 and a fifth wall 1055 arranged along a third direction Z. The connecting member 31 and the first wall 1051 are arranged along the first direction X. The connecting member 31, the first wall 1051, the second wall 1052, the third wall 1053, the fourth wall 1054 and the fifth wall 1055 connect the first shell 10, and the first shell 10 is enclosed in the second shell 105, thereby improving the structural strength of the battery pack 100.

[0126] In some embodiments, the battery pack 100 includes a protection plate 106 . Along the third direction Z, the protection plate 106 is located between the battery cell assembly 20 and the circuit board 102 to provide insulation protection and heat insulation for the circuit board 102 .

[0127] See also Fig.15 The present application also provides an electric device 200 using the above battery pack 100. In one embodiment, the electric device 200 of the present application may be, but is not limited to, a drone, a backup power supply, an electric car, an electric motorcycle, an electric power-assisted bicycle, an electric tool, a large household battery, and the like.

[0128] Those skilled in the art should recognize that the above embodiments are only used to illustrate the present application, and are not used as limitations on the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments are within the scope of the present application.

Claims

1. A battery pack, characterized in that: include: A first shell, comprising a first space and a first opening communicating with the first space; A battery cell assembly is disposed in the first space, the battery cell assembly includes a plurality of battery cells, and the battery cells include a pressure relief portion; A pressure relief assembly, comprising a first channel located outside the first space, the first channel and the first shell are arranged in a first direction, the pressure relief assembly comprises a second opening, the first opening and the second opening are connected to the first channel and the first space; When viewed along the first direction, the first opening overlaps with the second opening, and at least one of the pressure relief portions is located at the first opening; The exhaust portion is configured to exhaust the gas in the first channel to the outside of the battery pack.

2. The battery pack according to claim 1, wherein: The battery cell includes a main body, a sealing part and an electrode terminal, the sealing part is connected to the main body, the electrode terminal extends out of the sealing part, and the pressure relief part includes the sealing part.

3. The battery pack according to claim 1 or 2, characterized in that: The pressure relief assembly includes a connecting piece and a cover body; The connecting member is connected to the first shell, the cover is connected to the connecting member, and the first channel is formed. The second opening is arranged on the connecting member, and the exhaust part is arranged on the cover.

4. The battery pack according to claim 3, characterized in that: The cover body includes a base and a side portion surrounding the base, the side portion and the base form a recessed portion, the side portion is connected to the connecting member, and the exhaust portion is provided at the base.

5. The battery pack according to claim 4, characterized in that: The pressure relief assembly includes a partition. When viewed along the first direction, the partition is located between adjacent second openings along a second direction. The first direction is perpendicular to the second direction.

6. The battery pack according to claim 4 or 5, characterized in that: The pressure relief assembly includes a fire stopper located in the first channel. When viewed along the first direction, the fire stopper and the second opening are sequentially arranged along a third direction. The first direction, the second direction and the third direction are perpendicular to each other. The fire barrier comprises a first through hole layer and a second through hole layer, wherein the first through hole layer comprises a plurality of first through holes, and the second through hole layer comprises a plurality of second through holes, wherein the first through holes are closer to the second openings, and at least one of the first through holes is larger than any of the second through holes.

7. The battery pack according to claim 6, characterized in that: The fire barrier comprises a flat area and two second through-hole layers. When viewed along the first direction, the flat area is located between the two second through-hole layers along the second direction.

8. The battery pack according to claim 7, characterized in that: The fire barrier comprises a first barrier extending from the flat area, wherein the first barrier is disposed between the base and the connecting member; Along the third direction, a projection of the exhaust portion along the first direction and a projection of the first blocking portion along the first direction are arranged at an interval.

9. The battery pack according to claim 8, characterized in that: The fire blocking member includes a second blocking portion extending from the first blocking portion, and the second blocking portion is connected to the connecting member; The exhaust portion includes an opening penetrating the base portion, and when viewed along the first direction, at least a portion of the second blocking portion is located in the opening.

10. The battery pack according to any one of claims 1 to 9, characterized in that: The battery pack includes a circuit board, the battery cells and the circuit board are arranged along a third direction, the battery cells include electrode terminals, the electrode terminals are connected to the circuit board, and the first direction is perpendicular to the third direction.

11. The battery pack according to any one of claims 1 to 10, characterized in that: A heat insulating member is included, and the heat insulating member is arranged between adjacent battery cells. The heat conductivity of the heat insulating member at 800° C. is less than 0.05 (W / (m·K)).

12. The battery pack according to claim 11, wherein: The battery cell comprises a main body, a sealing part and an electrode terminal, wherein the sealing part is connected to the main body, and the electrode terminal extends out of the sealing part; Observed along the first direction, along the third direction, the thermal insulation member is lower than the sealing portion and higher than the main body portion, and the first direction is perpendicular to the third direction.

13. An electrical equipment, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 12.

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