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 and a barrier. The battery cell assembly is arranged in the first shell, the battery cell assembly comprises a first battery cell group and a second battery cell group, each of the first battery cell group and the second battery cell group comprises at least one battery cell, each battery cell comprises a main body part and a pressure relief part, and the pressure relief part is located on one side of the main body part in the second direction. The barrier is arranged between the first battery cell group and the second battery cell group along the first direction, the barrier comprises a first space and a first opening communicated with the first space, the first opening is positioned on one side of the barrier along the second direction, the pressure relief part and the first opening are positioned on the same side of the battery cell assembly, and the first direction is perpendicular to the second direction. The barrier member slows down the thermal diffusion speed during thermal runaway of the battery cells, and the first opening and the first space store part of particulate matters in gas generated by thermal runaway, so that the risks of secondary combustion caused by the particulate matters and thermal runaway of the adjacent battery cells are reduced, 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 battery packs become increasingly popular in mobile device electronics and the electric vehicle market, in addition to the increasing demand for battery pack energy density, the safety performance of secondary battery packs has also attracted much attention. When thermal runaway occurs in a secondary battery pack, it is very easy to cause thermal runaway of adjacent cells, affecting the safety of the battery pack. Summary of the invention

[0003] In view of this, it is necessary to provide a battery pack and an electrical device to improve the safety of the battery pack.

[0004] The embodiment of the present application provides a battery pack, comprising: a first shell, a cell assembly and a barrier. The cell assembly is arranged in the first shell, the cell assembly comprises a first cell group and a second cell group, the first cell group and the second cell group each comprises at least one cell, the cell comprises a main body and a pressure relief portion, and the pressure relief portion is located on one side of the main body along the second direction. Along the first direction, the barrier is arranged between the first cell group and the second cell group, the barrier comprises a first space and a first opening connected to the first space, the first opening is located on one side of the barrier along the second direction, the pressure relief portion and the first opening are located on the same side of the cell assembly, and the first direction is perpendicular to the second direction. When any cell in the first cell group and the second cell group has thermal runaway, the barrier reduces the mutual influence between the first cell group and the second cell group, slows down the heat diffusion rate when the cell is in thermal runaway, the first opening and the first space store particulate matter in the gas generated by thermal runaway, reduces the risk of secondary combustion caused by particulate matter and thermal runaway of adjacent cells, and improves the safety of the battery pack.

[0005] In one or more optional embodiments above, the barrier comprises a first side wall, a second side wall and a partition wall, and the first side wall, the partition wall and the second side wall are arranged at intervals along a first direction. In a direction opposite to the second direction, the partition wall exceeds the first side wall and the second side wall. The partition wall slows down the heat diffusion rate when the battery cell is in thermal runaway, and the particles generated by the thermal runaway fall from the first opening into the first space, which is conducive to improving the safety of the battery pack.

[0006] In one or more of the above optional embodiments, the second direction is the direction of gravity. Under the action of gravity, particles generated by thermal runaway are facilitated to fall from the first opening into the first space, further improving the safety of the battery pack.

[0007] In one or more optional embodiments above, the barrier comprises a third side wall and a fourth side wall, the third side wall and the fourth side wall are arranged along the third direction, and the first direction, the second direction and the third direction are perpendicular to each other. The first side wall connects the third side wall and the fourth side wall, and the second side wall connects the third side wall and the fourth side wall to form a first space, and along the first direction, the partition wall divides the first space into a first receiving space and a second receiving space.

[0008] In one or more optional embodiments above, the first shell includes a first bottom wall, and the first bottom wall connects the first side wall, the second side wall, the third side wall and the fourth side wall.

[0009] In one or more optional embodiments above, the barrier comprises a first partition, which is arranged in the first receiving space and divides the first receiving space into a plurality of first subspaces arranged along a third direction, and the first partition is connected to the first bottom wall, and divides the particles into a plurality of first subspaces, so as to reduce the risk of the particles in the first receiving space stacking and catching fire, and the gas particles collide with the first partition, which is conducive to extinguishing the sparks on the particles. And\or, the barrier comprises a second partition, which is arranged in the second receiving space and divides the second receiving space into a plurality of second subspaces arranged along a second direction, and the second partition is connected to the first bottom wall, and divides the particles into a plurality of second subspaces, so as to reduce the risk of the particles in the second receiving space stacking and catching fire, and the gas particles collide with the second partition, which is conducive to extinguishing the sparks on the particles.

[0010] In one or more optional embodiments above, the battery pack includes a circuit board, the circuit board and the main body are arranged along the second direction, the battery cell is connected to the circuit board, and along the second direction, the pressure relief portion and the first opening are both facing the circuit board. The circuit board can block the gas from flowing upward and guide the gas toward the barrier, which is conducive to collecting particulate matter in the gas in the first space, reducing the risk of secondary combustion caused by particulate matter and causing thermal runaway of adjacent battery cell groups.

[0011] In one or more of the above optional embodiments, the battery pack includes a thermal insulation member, and the thermal conductivity of the thermal insulation member at 800°C is less than 0.05 (W / (m·K)). The thermal insulation member is arranged between adjacent battery cells, which is conducive to slowing down the heat conduction between adjacent battery cells; and\or arranged between the first battery cell group and the first side wall, reducing the transfer of the first battery cell group to the first side wall; and\or arranged between the second battery cell group and the second side wall, reducing the transfer of the second battery cell group to the second side wall. Along the second direction, the thermal insulation member is lower than the pressure relief portion, and the main body is lower than the thermal insulation member, which is further conducive to slowing down the heat conduction between adjacent battery cells and reducing the flow of particulate matter generated by thermal runaway toward the barrier.

[0012] In one or more optional embodiments above, the battery cell includes a sealing portion and an electrode terminal, the sealing portion is connected to the main body, the electrode terminal extends from the sealing portion, and the pressure relief portion includes the sealing portion. Along the first direction, at least part of the projection of each sealing portion is located within the projection of the partition wall. The partition wall is conducive to reducing the risk of particles in the battery cell with thermal runaway diffusing to the surface of another battery cell group to trigger thermal runaway.

[0013] In one or more optional embodiments above, along the direction opposite to the second direction, the first side wall is lower than the pressure relief portion and exceeds the main body, so that when the first battery cell group thermally runs away, gas particles can easily fall into the first space. And\or, along the direction opposite to the second direction, the second side wall is lower than the pressure relief portion and exceeds the main body, so that when the second battery cell group thermally runs away, gas particles can easily fall into the first space.

[0014] In one or more optional embodiments above, a plurality of battery cells are arranged along a first direction to form a first battery cell group, and electrode terminals of adjacent battery cells are bent and connected.

[0015] In one or more optional embodiments above, a plurality of battery cells are arranged along the first direction to form a second battery cell group, and electrode terminals of adjacent battery cells are bent and connected.

[0016] In one or more optional embodiments above, along a direction opposite to the second direction, the partition wall exceeds the sealing portion of the first battery cell group, which is beneficial to reducing the mutual influence between the first battery cell group and the second battery cell group.

[0017] In one or more optional embodiments above, along a direction opposite to the second direction, the partition wall exceeds the sealing portion of the second battery cell group, which is beneficial to reducing the mutual influence between the first battery cell group and the second battery cell group.

[0018] In one or more of the above optional embodiments, the partition wall is connected to the first bottom wall to separate the first receiving space from the second receiving space.

[0019] In one or more of the above optional embodiments, at least a portion of the third side wall is disposed in the first receiving groove, and at least a portion of the fourth side wall is disposed in the second receiving groove, which is beneficial for limiting the blocking member.

[0020] In one or more optional embodiments above, along a direction opposite to the second direction, the partition wall exceeds the first side wall, and the partition wall exceeds the second side wall. The partition wall divides the first opening into a first sub-opening and a second sub-opening.

[0021] In one or more of the above optional embodiments, the thermal insulation element includes aerogel.

[0022] An embodiment of the present application provides an electrical device, comprising the battery pack in any one of the above embodiments.

[0023] For the above-mentioned battery pack and electrical equipment, when thermal runaway occurs in any battery cell of the first battery cell group and the second battery cell group, the mutual influence between the first battery cell group and the second battery cell group is reduced by the barrier component, thereby slowing down the heat diffusion rate during thermal runaway of the battery cells, and the first opening and the first space store particulate matter in the gas generated by the thermal runaway, thereby reducing the risk of secondary combustion caused by the particulate matter and causing thermal runaway of adjacent battery cells, thereby improving the safety of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of a battery pack in some embodiments of the present application is shown.

[0025] Figure 2 A schematic diagram of the exploded structure of a battery pack in some embodiments of the present application is shown.

[0026] Figure 3 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0027] Figure 4 A schematic diagram of the structure of a portion of a battery pack from another perspective in some embodiments of the present application is shown.

[0028] Figure 5 Shows Figure 4 A magnified view of the structure of part II.

[0029] Figure 6 A schematic diagram of the structure of the barrier in some embodiments of the present application is shown.

[0030] Figure 7 A schematic structural diagram of a barrier from another viewing angle in some embodiments of the present application is shown.

[0031] Figure 8 Shows Figure 7 Schematic diagram of the cross section along the AA direction.

[0032] Fig. 9 A schematic structural diagram of the first shell in some embodiments of the present application is shown.

[0033] Fig.10 A schematic structural diagram of the second shell in some embodiments of the present application is shown.

[0034] Fig.11 A schematic diagram of the structure of some battery packs in some embodiments of the present application is shown.

[0035] Fig.12 A simplified schematic diagram of electrical equipment in some embodiments is shown.

[0036] Description of main component symbols: Battery Pack 100 First housing 10 Second space 10a First bottom wall 10b Second opening 10c First Shell 11 The first shell space 11a First case bottom wall 11b1 First Wall 111 First receiving groove 111a Second Shell 12 Second shell space 12a Second shell bottom wall 12b2 Second Wall 121 The second receiving groove 121a 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 Barrier 30 First space 30a First opening 30b First sub-opening 30b1 Second sub-opening 30b2 First side wall 31 Second side wall 32 Partition wall 33 The third side wall 34 Fourth side wall 35 First partition 36 Second partition 37 First Containment Space 301 Second storage space 302 First subspace 301a Second subspace 302a Pressure relief assembly 40 First channel 40a The third opening 40b Exhaust portion 40c Connector 41 Cover 42 Partition 43 Fire arrester 50 The first via layer 51 First through hole 511 The second via layer 52 The second through hole 521 The third via layer 53 The third through hole 531 Circuit Boards 101 Protection board 102 Thermal insulation 103 The first elastic member 104 The second elastic member 105 Second housing 106 The first connecting wall 1061 The second connecting wall 1062 The third connecting wall 1063 Fourth connecting wall 1064 Fifth connecting wall 1065 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

[0037] 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.

[0038] When a component is considered to be “provided on” another component, it can be directly provided on the other component or there may be a component in between. 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 in between.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] See also Figures 1 to 6 An embodiment of the present application provides a battery pack 100 , including a first shell 10 and a battery cell assembly 20 , wherein the battery cell assembly 20 is disposed in the first shell 10 .

[0044] In some embodiments, the battery cell assembly 20 includes a first battery cell group 201 and a second battery cell group 202, and the first battery cell group 201 and the second battery cell group 202 each include at least one battery cell 21. Each battery cell 21 includes a main body 211 and a pressure relief portion 21a, and the pressure relief portion 21a is located on one side of the main body 211 along the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0045] In some embodiments, the main body 211 includes an electrode assembly (not shown), the electrode assembly includes a positive electrode sheet, a separator and a negative electrode sheet, and the separator is disposed between the positive electrode sheet and the negative electrode sheet.

[0046] In some embodiments, the battery pack 100 includes a barrier 30, which is disposed between the first battery cell group 201 and the second battery cell group 202 along the first direction X. The barrier 30 includes a first space 30a and a first opening 30b connected to the first space 30a, the first opening 30b is located on one side of the barrier 30 along the second direction Y, and the pressure relief portion 21a and the first opening 30b are located on the same side of the battery cell assembly 20.

[0047] When thermal runaway occurs in any of the first battery cell group 201 and the second battery cell group 202, the barrier 30 is used to reduce the mutual influence between the first battery cell group 201 and the second battery cell group 202, and the heat diffusion rate of the battery cell 21 during thermal runaway is slowed down. The first opening 30b and the first space 30a store part of the particulate matter in the gas generated by the thermal runaway, reducing the risk of secondary combustion caused by the particulate matter and causing thermal runaway of adjacent battery cells, thereby improving the safety of the battery pack 100.

[0048] See also Figure 2 and Figure 3 In some embodiments, the battery cell 21 includes 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 .

[0049] In some embodiments, the pressure relief portion 21 a includes a sealing portion 212 , through which the gas in the battery cell 21 is discharged.

[0050] 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.

[0051] In some embodiments, a plurality of battery cells 21 are arranged along a first direction X to form a first battery cell group 201. The electrode terminals 213 of adjacent battery cells 21 are bent and connected.

[0052] In some embodiments, a plurality of battery cells 21 are arranged along the first direction X to form a second battery cell group 202. The electrode terminals 213 of adjacent battery cells 21 are bent and connected.

[0053] 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.

[0054] See also Figure 2 and Figure 3 In some embodiments, the first housing 10 includes a second space 10a, and the battery cell assembly 20 is disposed in the second space 10a. The first housing 10 includes a first bottom wall 10b, and the battery cell assembly 20 and the first bottom wall 10b are arranged along a second direction Y, and the first direction X is perpendicular to the second direction Y.

[0055] In 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 third direction Z, the first shell 11 is provided with a first shell space 11a and a first shell bottom wall 11b1, the second shell 12 is provided with a second shell space 12a and a second shell bottom wall 12b2, the first shell 11 is connected to the second shell 12, and forms a second space 10a and a first bottom wall 10b. The battery cell assembly 20 is located in the first shell 11 and the second shell 12. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0056] See also Fig. 9 and Fig.10 In some embodiments, the first shell 11 includes a first wall 111, and along the third direction Z, a side of the first wall 111 facing the second shell 12 is provided with a plurality of first receiving grooves 111a, the plurality of first receiving grooves 111a are arranged along the first direction X, and each first receiving groove 111a extends along the second direction Y. Along the third direction Z, one side of the main body 211 is provided in the first receiving groove 111a, and the position of the battery cell 21 is limited along the first direction X.

[0057] In some embodiments, the second shell 12 includes a second wall 121, and the first wall 111 and the second wall 121 are arranged along a third direction Z. Along the third direction Z, a side of the second wall 121 facing the first shell 11 is provided with a plurality of second receiving grooves 121a, and the plurality of second receiving grooves 121a are arranged along the first direction X, and each second receiving groove 121a extends along the second direction Y. Along the third direction Z, 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 first direction X.

[0058] 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 .

[0059] 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 .

[0060] In some embodiments, the main body 211 is bonded into the first receiving groove 111 a.

[0061] In some embodiments, the main body 211 is bonded into the second receiving groove 121 a.

[0062] See also Figures 3 to 8 In some embodiments, the barrier 30 includes a first side wall 31 and a second side wall 32 , and the first side wall 31 and the second side wall 32 are spaced apart along the first direction X.

[0063] In some embodiments, along the first direction X, the first side wall 31 is closer to the first battery cell group 201 , and the second side wall 32 is closer to the second battery cell group 202 .

[0064] In some embodiments, the barrier 30 includes a partition wall 33 . Along the first direction X, the partition wall 33 is disposed between the first side wall 31 and the second side wall 32 , and is spaced apart from the first side wall 31 and the second side wall 32 .

[0065] In some embodiments, along the direction opposite to the second direction Y, the partition wall 33 extends beyond the first side wall 31, and the partition wall 33 extends beyond the second side wall 32. The partition wall 33 slows down the heat diffusion rate of the battery cell 21 during thermal runaway, and the particulate matter generated by the thermal runaway falls from the first opening 30b into the first space 30a, which is beneficial to improving the safety of the battery pack 100.

[0066] In some embodiments, the second direction Y is the direction of gravity. Under the action of gravity, particles generated by thermal runaway are facilitated to fall from the first opening 30 b into the first space 30 a, further improving the safety of the battery pack 100 .

[0067] In some embodiments, along the first direction X, at least a portion of the projection of each sealing portion 212 is located within the projection of the partition wall 33 , which helps the partition wall 33 reduce the risk of particles in the thermal runaway battery cell 21 diffusing to the surface of another battery cell group and triggering thermal runaway.

[0068] See also Figure 5 Along the direction opposite to the second direction Y, the partition wall 33 exceeds the sealing portion 212 of the first battery cell group 201 , which is beneficial to reducing the mutual influence between the first battery cell group 201 and the second battery cell group 202 .

[0069] See also Figure 5 Along the direction opposite to the second direction Y, the partition wall 33 exceeds the sealing portion 212 of the second battery cell group 202 , which is beneficial to reducing the mutual influence between the first battery cell group 201 and the second battery cell group 202 .

[0070] In some embodiments, along the direction opposite to the second direction Y, the first side wall 31 is lower than the pressure relief portion 21a of the first battery cell group 201 and exceeds the main body 211 of the first battery cell group 201, so that when the first battery cell group 201 thermally runs away, gas particles can fall into the first space 30a.

[0071] See also Figure 5 In the direction opposite to the second direction Y, the first side wall 31 is lower than the sealing portion 212 of the first battery cell group 201 .

[0072] In some embodiments, along the direction opposite to the second direction Y, the second side wall 32 is lower than the pressure relief portion 21a of the second battery cell group 202 and exceeds the main body 211 of the second battery cell group 202, so that when the second battery cell group 202 thermally runs away, gas particles can fall into the first space 30a.

[0073] See also Figure 5 , in a direction opposite to the second direction Y, the second side wall 32 is lower than the sealing portion 212 of the second battery cell group 202 .

[0074] In some embodiments, the barrier 30 includes a third side wall 34 and a fourth side wall 35, which are arranged along the third direction Z. The first side wall 31 connects the third side wall 34 and the fourth side wall 35, and the second side wall 32 connects the third side wall 34 and the fourth side wall 35 to form a first space 30a.

[0075] In some embodiments, the partition wall 33 connects the third side wall 34 and the fourth side wall 35 , and the partition wall 33 divides the first space 30 a into a first receiving space 301 and a second receiving space 302 .

[0076] In one embodiment, the partition wall 33 is connected to the first bottom wall 10 b to separate the first receiving space 301 from the second receiving space 302 .

[0077] In some embodiments, gas particles generated when the first battery cell group 201 thermally runs away may fall into the first receiving space 301 , and gas particles generated when the second battery cell group 202 thermally runs away may fall into the second receiving space 302 .

[0078] In some embodiments, at least a portion of the third side wall 34 is disposed in the first receiving groove 111 a , and at least a portion of the fourth side wall 35 is disposed in the second receiving groove 121 a , which is beneficial for limiting the blocking member 30 .

[0079] Optionally, a side of the third side wall 34 facing away from the fourth side wall 35 has an arc-shaped structure, so as to facilitate disposing the blocking member 30 in the first receiving groove 111 a.

[0080] Optionally, a side of the fourth side wall 35 facing away from the third side wall 34 has an arc-shaped structure, so as to facilitate disposing the blocking member 30 in the second receiving groove 121 a.

[0081] In some embodiments, along the second direction Y, one side of the first side wall 31 , the second side wall 32 , the third side wall 34 and the fourth side wall 35 are connected to the first bottom wall 10 b , and the other side forms a first opening 30 b . The connection includes but is not limited to abutment, bonding and the like.

[0082] In some embodiments, see Figure 5 and Figure 6 , along the direction opposite to the second direction Y, the partition wall 33 exceeds the first side wall 31, and the partition wall 33 exceeds the second side wall 32. The partition wall 33 divides the first opening 30b into a first sub-opening 30b1 and a second sub-opening 30b2. The particles generated when the first battery cell group 201 thermally runs away fall into the first receiving space 301 through the first sub-opening 30b1, and the particles generated when the second battery cell group 202 thermally runs away fall into the second receiving space 302 through the second sub-opening 30b2.

[0083] In some embodiments, the barrier 30 includes a first partition 36, which is disposed in the first containing space 301 and divides the first containing space 301 into a plurality of first subspaces 301a arranged along a third direction Z, thereby dividing the particles into the plurality of first subspaces 301a, thereby reducing the risk of stacking and catching fire of particles in the first containing space 301. The gas particles collide with the first partition 36, which is conducive to extinguishing sparks on the particles.

[0084] In some embodiments, the first partition plate 36 is connected to the first bottom wall 10 b to completely separate the plurality of first sub-spaces 301 a , thereby reducing the risk of fire caused by the accumulation of particles at the bottom of the plurality of first sub-spaces 301 a .

[0085] In some embodiments, the barrier 30 includes a second partition 37, which is disposed in the second containing space 302 and divides the second containing space 302 into a plurality of second subspaces 302a arranged along a third direction Z, thereby dividing the particles into the plurality of second subspaces 302a, thereby reducing the risk of stacking and ignition of particles in the second containing space 302, and the gas particles collide with the second partition 37, which is conducive to extinguishing sparks on the particles.

[0086] In some embodiments, the second partition 37 is connected to the first bottom wall 10b to completely separate the plurality of second subspaces 302a, thereby reducing the risk of fire caused by the accumulation of particles at the bottom of the plurality of second subspaces 302a.

[0087] In some embodiments, the material of the barrier 30 includes a metal material, such as aluminum.

[0088] See also Figures 3 to 5 In some embodiments, the battery pack 100 includes a circuit board 101, the circuit board 101 and the main body 211 are arranged along the second direction Y, and the electrode terminal 213 is connected to the circuit board 101. Along the second direction Y, the pressure relief portion 21a and the first opening 30b are both facing the circuit board 101. The circuit board 101 can block the gas from flowing upward and guide the gas toward the barrier 30, which is conducive to the first space 30a to collect particulate matter in the gas, reducing the risk of secondary combustion caused by particulate matter and causing thermal runaway of adjacent battery cell groups.

[0089] Optionally, the circuit board 101 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.

[0090] Optionally, the circuit board 101 includes a flexible printed circuit (FPC). Optionally, the circuit board 101 includes a printed circuit board (PCB).

[0091] In some embodiments, the battery pack 100 includes a protection plate 102 . Along the second direction Y, the protection plate 102 is located between the battery cell assembly 20 and the circuit board 101 to provide insulation protection and heat insulation for the circuit board 101 .

[0092] See also Figure 4 and Figure 5 In some embodiments, the battery pack 100 includes a heat insulating member 103, and the heat insulating member 103 is disposed between adjacent battery cells 21, which is beneficial to slow down the heat conduction between adjacent battery cells 21. Optionally, the battery pack 100 includes a plurality of heat insulating members 103, and a heat insulating member 103 is disposed between each adjacent battery cell 21. Optionally, a heat insulating member 103 is disposed between some adjacent battery cells 21. The thermal conductivity of the heat insulating member 103 at 800°C is less than 0.05 (W / (m·K)), which is beneficial to reduce the mutual influence between the battery cells 21 when thermal runaway occurs in the battery cells 21.

[0093] 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)).

[0094] In some embodiments, along the first direction X, the heat insulating member 103 is disposed between the first battery cell group 201 and the first side wall 31 to reduce the amount of heat transferred from the first battery cell group 201 to the first side wall 31 .

[0095] In some embodiments, along the first direction X, the heat insulating member 103 is disposed between the second battery cell group 202 and the second side wall 32 to reduce the amount of heat transferred from the second battery cell group 202 to the second side wall 32 .

[0096] In some embodiments, along the second direction Y, the thermal insulation member 103 is lower than the pressure relief portion 21 a , and the main body 211 is lower than the thermal insulation member 103 , which is further beneficial to slow down the heat conduction between adjacent battery cells 21 and reduce the flow of particles generated by thermal runaway toward the barrier 30 .

[0097] In some embodiments, the battery pack 100 includes a first elastic member 104, and the battery cell assembly 20 is disposed between two first elastic members 104 along the first direction X, wherein one first elastic member 104 is disposed between the heat insulating member 103 and the first battery cell group 201, and another first elastic member 104 is disposed between the second battery cell group 202 and another heat insulating member 103. The first elastic member 104 provides expansion space and pre-pressure for the battery cell 21. Optionally, the first elastic member 104 includes foam.

[0098] In some embodiments, the battery pack 100 includes a second elastic member 105, and along the second direction Y, the second elastic member 105 is disposed between the first bottom wall 10b and the battery cell assembly 20. Optionally, the second elastic member 105 includes foam.

[0099] See also Figure 2 , Fig. 9 and Fig.11 In some embodiments, the battery pack 100 includes a pressure relief assembly 40 , and the pressure relief assembly 40 includes a first channel 40 a located outside the second space 10 a .

[0100] In some embodiments, the first wall 111 is provided with a second opening 10c, the pressure relief assembly 40 includes a third opening 40b, and the second opening 10c and the third opening 40b are connected to the first channel 40a and the second space 10a. Fig.11 , viewed along the third direction Z, the second opening 10c overlaps with the third opening 40b, and at least one pressure relief portion 21a is located at the second opening 10c.

[0101] In some embodiments, the battery pack 100 includes a vent portion 40 c configured to exhaust the gas of the first channel 40 a to the outside of the battery pack 100 .

[0102] By locating the pressure relief portion 21a in the second opening 10c along the third direction Z, the exhaust path is shortened so that part of the gas generated when the battery cell 21 thermally runs away enters the first channel 40a through the second opening 10c and the third opening 40b, thereby reducing the accumulation of gas in the second space 10a and discharging the gas from the first channel 40a through the exhaust portion 40c to the outside of the battery pack 100, thereby releasing the pressure in time and improving the safety of the battery pack 100.

[0103] In some embodiments, the pressure relief assembly 40 includes a connecting member 41, and the connecting member 41 is connected to the first wall 111. The third opening 40b is provided on the connecting member 41. The third opening 40b penetrates the connecting member 41 along the third direction Z.

[0104] In some embodiments, the pressure relief assembly 40 includes a cover body 42, which is connected to the connector 41 to form a first channel 40a. The exhaust portion 40c is disposed on the cover body 42. The exhaust portion 40c penetrates the cover body 42 along the third direction Z.

[0105] In some embodiments, the pressure relief assembly 40 includes a partition 43, and the partition 43 is disposed between adjacent third openings 40b along the first direction X. After the gas enters the first channel 40a from the third opening 40b, the partition 43 reduces the occurrence of gas backflow from other adjacent third openings 40b to the second space 10a, and reduces the occurrence of the backflow gas and the gas entering the first channel 40a through other third openings 40b. The collision is beneficial to pressure relief.

[0106] In some embodiments, the battery pack 100 includes a fire barrier 50 , which is disposed in the first channel 40 a . When viewed along the third direction Z, the third opening 40 b and the fire barrier 50 are sequentially disposed along the second direction Y.

[0107] In some embodiments, the fire barrier 50 includes a first through-hole layer 51, which includes a plurality of first through-holes 511. The gas passes through the first through-holes 511. The first through-hole layer 51 can block some particulate matter in the gas, thereby reducing the risk of leakage of sparks generated by thermal runaway of the battery cell 21.

[0108] In some embodiments, the fire barrier 50 includes a second through-hole layer 52, a first through-hole layer 51 and a second through-hole layer 52 are arranged in sequence, and the second through-hole layer 52 includes a plurality of second through-holes 521, and at least one first through-hole 411 is larger than any second through-hole 521. The second through-hole layer 52 can further block some particulate matter in the gas and reduce the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0109] In some embodiments, the fire barrier 50 includes a third through hole layer 53, the third through hole layer 53 includes a plurality of third through holes 531, and at least one second through hole 521 is larger than any third through hole 531. Since the third through hole 531 is smaller than the second through hole 521, when the gas passes through the third through hole 531, part of the particles in the gas can be further blocked, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0110] See also Figure 2 In some embodiments, the battery pack 100 includes a second shell 106, and the second shell 106 includes a first connecting wall 1061, a second connecting wall 1062 and a third connecting wall 1063 arranged along the first direction X, and a fourth connecting wall 1064 and a fifth connecting wall 1065 arranged along the second direction Y. The connecting member 41 and the first connecting wall 1061 are arranged along the third direction Z. The connecting member 41, the first connecting wall 1061, the second connecting wall 1062, the third connecting wall 1063, the fourth connecting wall 1064 and the fifth connecting wall 1065 connect the first shell 10, and the first shell 10 is enclosed in the second shell 106, so as to improve the structural strength of the battery pack 100.

[0111] See also Fig.12The 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 pack, etc.

[0112] 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; A battery cell assembly is disposed in the first housing, the battery cell assembly includes a first battery cell group and a second battery cell group, the first battery cell group and the second battery cell group each include at least one battery cell, the battery cell includes a main body and a pressure relief portion, and the pressure relief portion is located on one side of the main body along the second direction; A barrier member is arranged between the first battery cell group and the second battery cell group along a first direction, the barrier member includes a first space and a first opening connected to the first space, the first opening is located on one side of the barrier member along the second direction, the pressure relief portion and the first opening are located on the same side of the battery cell assembly, and the first direction is perpendicular to the second direction.

2. The battery pack according to claim 1, wherein: The barrier comprises a first side wall, a second side wall and a partition wall, wherein the first side wall, the partition wall and the second side wall are spaced apart along the first direction; In a direction opposite to the second direction, the partition wall exceeds the first side wall and the second side wall.

3. The battery pack according to claim 2, characterized in that: The second direction is the direction of gravity.

4. The battery pack according to claim 2 or 3, characterized in that: The barrier comprises a third side wall and a fourth side wall, the third side wall and the fourth side wall are arranged along a third direction, and the first direction, the second direction and the third direction are perpendicular to each other; The first side wall connects the third side wall and the fourth side wall, the second side wall connects the third side wall and the fourth side wall, and forms a first space. Along the first direction, the partition wall divides the first space into a first receiving space and a second receiving space.

5. The battery pack according to claim 4, characterized in that: The first shell includes a first bottom wall, and the first bottom wall connects the first side wall, the second side wall, the third side wall and the fourth side wall.

6. The battery pack according to claim 5, characterized in that: The blocking member includes a first partition, which is disposed in the first receiving space and divides the first receiving space into a plurality of first sub-spaces arranged along the third direction, and the first partition is connected to the first bottom wall; And\or, the barrier member includes a second partition, the second partition is arranged in the second receiving space and divides the second receiving space into a plurality of second sub-spaces arranged along the second direction, and the second partition is connected to the first bottom wall.

7. The battery pack according to any one of claims 2 to 6, characterized in that: The battery pack includes a circuit board, the circuit board and the main body are arranged along the second direction, the battery cell is connected to the circuit board, and along the second direction, the pressure relief portion and the first opening both face the circuit board.

8. The battery pack according to any one of claims 2 to 7, characterized in that: The battery pack includes a heat insulating member, wherein the heat insulating member has a thermal conductivity of less than 0.05 (W / (m·K)) at 800°C; The heat insulating member is disposed between adjacent battery cells; and\or disposed between the first battery cell group and the first side wall; and\or disposed between the second battery cell group and the second side wall; Along the second direction, the heat insulating member is lower than the pressure relief portion, and the main body is lower than the heat insulating member.

9. The battery pack according to claim 8, characterized in that: The battery core comprises a sealing portion and an electrode terminal, the sealing portion is connected to the main body portion, the electrode terminal extends from the sealing portion, and the pressure relief portion comprises the sealing portion; At least a portion of a projection of each of the sealing portions is located within a projection of the partition wall along the first direction.

10. The battery pack according to any one of claims 2 to 9, characterized in that: Along a direction opposite to the second direction, the first side wall is lower than the pressure relief portion and exceeds the main body; And\or, along a direction opposite to the second direction, the second side wall is lower than the pressure relief portion and exceeds the main body.

11. An electrical device, characterized in that: A battery pack comprising the battery pack as claimed in any one of claims 1 to 10.

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