Battery pack and electric device

Abstract

Disclosed in the present application are a battery pack and an electric device. The battery pack comprises a housing, a first channel, a cell assembly, a first structural member, and a first exhaust portion. The housing comprises an accommodating space. The first channel is disposed in the accommodation space. The cell assembly is disposed in the accommodating space and comprises a plurality of cells, and at least one of the cells comprises a first pressure relief portion. The first structural member is disposed between the cell assembly and the housing, and is configured to be melted to enable communication between the first pressure relief portion and the first channel. The first exhaust portion is disposed on the housing, and is in communication with the first channel. The first channel is disposed in the housing and the first exhaust portion is in communication with the first channel, such that when thermal runaway or pressure relief occurs in the cell, the first structural member is melted by high-temperature gas and / or sparks ejected from the first pressure relief portion, thereby enabling communication between the first pressure relief portion and the first channel. This facilitates pressure relief and improves the safety of the battery pack.

Description

Battery packs and electrical equipment Technical Field

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

[0002] Currently, battery packs are widely used in electric vehicles, electric two-wheelers, and smart energy storage devices. In addition to the increasing demand for higher energy density, the safety performance of battery packs is also receiving much attention. In the event of thermal runaway, the battery pack needs 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 facilitates the depressurization of the battery pack.

[0004] Embodiments of this application provide a battery pack, including a housing, a first channel, a cell assembly, a first structural member, and a first vent. The housing includes a receiving space. The first channel is disposed in the receiving space. The cell assembly is disposed in the receiving space and includes a plurality of cells, at least one of which includes a first pressure relief portion. The first structural member is disposed between the cell assembly and the housing, and is configured to be melted, such that the first pressure relief portion communicates with the first channel. The first vent is disposed in the housing and communicates with the first channel. By providing the first channel within the housing and having the first vent communicate with it, when the cell experiences thermal runaway or pressure relief, the first structural member is melted by the high-temperature gas and / or sparks ejected from the first pressure relief portion, thus communicating with the first channel, which facilitates pressure relief and improves the safety of the battery pack.

[0005] In one or more of the above optional embodiments, a first bracket is further included. The battery cell assembly is connected to the first bracket. The first bracket includes a first opening. A first pressure relief section communicates with the first opening. The first bracket is connected to a first structural member, and the first structural member closes the first opening. This reduces the occurrence of potting compound entering the first opening and causing blockage, or reduces the occurrence of potting compound entering the first opening and causing the first pressure relief section to be unable to open, which is beneficial for pressure relief.

[0006] In one or more of the above optional embodiments, the first bracket is provided with an extension, a first opening is provided in the extension, the battery cell is connected to the extension, and at least a portion of the first pressure relief portion is exposed in the first opening and spaced apart from the first structural member. When the battery cell experiences thermal runaway or pressure relief, the gap between the first pressure relief portion and the first structural member can provide space for the sealing pin to flip or burst, facilitating communication between the first hole and the first opening, and is beneficial for containing high-temperature and high-pressure gas, causing the portion of the first structural member that seals the first opening to melt, which is beneficial for pressure relief and improves the safety of the battery pack.

[0007] In one or more of the above optional embodiments, the housing includes a bottom wall, the bottom wall and the cell assembly are arranged along a first direction, and a first structural member is disposed between the first support and the bottom wall. It also includes a potting compound disposed in the receiving space, which bonds the cell assembly, the first support, the first structural member, and the housing, facilitating the fixation of the cell assembly.

[0008] In one or more of the above optional embodiments, a second structural member is further included. The second structural member is disposed in the receiving space and connected to the first structural member. The second structural member has a first channel and a second opening communicating with the first channel. The first structural member closes the second opening. This reduces the possibility of potting compound entering the first channel through the second opening and causing blockage of the first channel, which is beneficial for pressure relief.

[0009] In one or more of the above optional embodiments, the second structural member is provided with a third opening communicating with the first channel, and the third opening extends beyond the potting compound along the first direction. This reduces the possibility of potting compound entering the first channel through the third opening and causing blockage of the first channel, thus facilitating pressure relief.

[0010] In one or more of the above optional embodiments, the battery cell includes a battery cell housing and a sealing pin. The battery cell housing includes a first hole, and the sealing pin seals the first hole. The sealing pin and the first hole form at least a portion of a first pressure relief portion. When the battery cell experiences thermal runaway or pressure relief, the welded position between the sealing pin and the battery cell housing opens, or the sealing pin breaks, allowing the first hole to communicate with the first opening, which facilitates pressure relief.

[0011] In one or more of the above optional embodiments, a first connector is further included. The first connector is disposed in the receiving space and connected to the housing, forming a first receiving space with the housing. The first receiving space includes a first space and a second space that are separated. A cell assembly is disposed in the first space, and the cell assembly and the first connector are arranged along a first direction. A second channel is formed between the cell assembly and the first connector, the second channel connecting the first channel and the second space, and a first venting portion connecting to the second space. When the cell is depressurized, gas is ejected from the first depressurization portion, at least a portion of the gas enters the first channel through the first opening, enters the second channel from the first channel, enters the second space from the second channel, and is discharged outside the battery pack from the first venting portion.

[0012] In one or more of the above optional embodiments, the at least one battery cell further includes a second pressure relief section. It also includes a second bracket connected to the battery cell assembly, the second bracket including a fourth opening, and the second pressure relief section communicating with the fourth opening.

[0013] In one or more of the above optional embodiments, the second pressure relief section includes an explosion-proof valve.

[0014] In one or more of the above optional embodiments, an insulating element is further included. The insulating element connects to the second bracket and is disposed between the second bracket and the first connector. The insulating element covers the fourth opening and is configured to be lifted or melted, so that the fourth opening connects to the second channel. Under normal battery pack operation, the insulating element, disposed between the second bracket and the first connector, insulates the conductive element and the first connector. In the event of thermal runaway or depressurization of the battery pack, in the initial stage of depressurization, the insulating element can be lifted by gas, which enters the second channel through the fourth opening. During continuous depressurization, the insulating element is at least partially melted by sparks or high-temperature gas, so that the fourth opening connects to the second channel.

[0015] In one or more of the above optional embodiments, the insulating member and the first connector are spaced apart along a first direction. A gap exists between the insulating member and the first connector. This gap provides space for the insulating member to move toward the first connector, facilitating communication of the fourth opening with the second channel.

[0016] In one or more of the above optional embodiments, the end of the second bracket facing away from the battery cell is provided with a limiting protrusion, and the insulating component is provided with a limiting hole, with the limiting protrusion located in the limiting hole.

[0017] In one or more of the above optional embodiments, the first connector and the housing further form a second receiving space. The first connector has a second hole that connects the second receiving space and the first receiving space. A second vent is also included, configured such that gas discharged from the first and / or second pressure relief section enters the second receiving space through the second hole and is discharged from the second vent to the outside of the housing. The first and second vents improve the pressure relief efficiency of the battery pack, which is beneficial for improving the safety of the battery pack.

[0018] In one or more of the above optional embodiments, the first venting section is configured to vent at a first pressure threshold, and the second venting section is configured to vent at a second pressure threshold, wherein the first pressure threshold is less than the second pressure threshold. When the battery cell depressurizes, the first venting section depressurizes before the second venting section. When the gas generation rate in the battery pack is greater than the gas dissipation rate of the first venting section, the second venting section and the first venting section depressurize together, thereby improving the depressurization efficiency.

[0019] In one or more of the above optional embodiments, a second connector is further included, which covers the second exhaust portion. The second connector has a third hole configured to allow gas to flow through to the second exhaust portion. Increasing the collision between the gas and the second connector, and increasing the collision between the second connector and the Martian sparks, is beneficial for annihilating the Martian sparks.

[0020] In one or more of the above optional embodiments, a blocking element is also included. The blocking element is disposed in the second space and includes a through hole that connects to the first exhaust section. When the battery cell experiences thermal runaway or depressurization, high-temperature gas and / or sparks act on the blocking element. The gas collides with the blocking element and passes through the through hole of the blocking element. The through hole can block some of the particulate matter in the high-temperature gas and annihilate the sparks, reducing the risk of spark leakage caused by thermal runaway of the battery cell.

[0021] In one or more of the above optional embodiments, the blocking member includes a first through-hole section and a second through-hole section connecting the first through-hole section. The first through-hole section includes a plurality of first through-holes, and the second through-hole section includes a plurality of second through-holes. The second through-holes are closer to the first exhaust portion, and the area of ​​at least one first through-hole is larger than that of any one of the second through-holes. High-temperature gas passes through the first through-holes, and the first through-hole section can block some of the particulate matter in the high-temperature gas, reducing the risk of spark leakage caused by thermal runaway of the battery cell. When the gas passes through the smaller second through-holes, it can further block smaller particulate matter in the gas, reducing the risk of spark leakage caused by thermal runaway of the battery cell.

[0022] In one or more of the above optional embodiments, a second structural member is also included. The second structural member is disposed in the receiving space and is configured to melt at a first temperature, so that the space occupied by the second structural member forms a first channel, thereby expanding the first channel, which is beneficial for depressurization and increasing the depressurization rate.

[0023] This application provides an electrical device including the battery pack in any of the above embodiments.

[0024] The aforementioned battery pack and electrical equipment have a first channel inside the casing, and a first venting part is connected to the first channel. When the battery cell experiences thermal runaway or pressure relief, the first structural component is melted by the high-temperature gas and / or sparks ejected from the first pressure relief part, which connects the first pressure relief part with the first channel, thus facilitating pressure relief and improving the safety of the battery pack. Attached Figure Description

[0025] Figure 1 shows a schematic diagram of the battery pack structure in some embodiments.

[0026] Figure 2 shows a partial battery pack exploded view in some embodiments.

[0027] Figure 3 shows a cross-sectional view of part of the battery pack in Figure 2 along IV-IV.

[0028] Figure 4 shows an enlarged schematic diagram of part A in Figure 3.

[0029] Figure 5 shows a cross-sectional view of a portion of the battery pack in some embodiments.

[0030] Figure 6 shows a schematic diagram of the structure of the lower shell and the blocking element in some embodiments.

[0031] Figure 7 shows a schematic diagram of the structure of the first support, the second support, the cell assembly, and the insulation in some embodiments.

[0032] Figure 8 shows an exploded view of Figure 9.

[0033] Figure 9 shows a cross-sectional view of the battery cell in some embodiments.

[0034] Figure 10 shows a schematic diagram of the structure of the second structural member in some embodiments.

[0035] Figure 11 shows a schematic diagram of the structure of a portion of the battery pack in some embodiments.

[0036] Figure 12 shows a cross-sectional view from another perspective in Figure 3.

[0037] Figure 13 shows a cross-sectional view of part of the battery pack in Figure 2 along II-II.

[0038] Figure 14 shows an enlarged schematic diagram of part B in Figure 13.

[0039] Figure 15 shows a cross-sectional view of a portion of the battery pack in some embodiments.

[0040] Figure 16 shows a schematic diagram of the structure of the first connector in some embodiments.

[0041] Figure 17 shows a schematic diagram of the top cover in some embodiments.

[0042] Figure 18 shows a cross-sectional view of the top cover along line III-III in Figure 17.

[0043] Figure 19 shows a schematic diagram of the structure of the blocking element in some embodiments.

[0044] Figure 20 shows a schematic diagram of the structure of the electrical equipment in some embodiments.

[0045] Key component symbols: Battery pack 100, Fastener 100a, Housing 10, Receiving space 10a, Lower shell 11, Fixing part 11a, First side wall 111, First connecting part 1111, Second side wall 112, Connecting protrusion 1121, Third side wall 113, Fourth side wall 114, Bottom wall 115, First connecting wall 116, Sixth opening 116a, First wall 1161, Second wall 1162, First end face 1162a, Top cover 12, Cell assembly 20, Cell 21, Cell housing 211, First hole 2111, Sealing nail 212, Adhesive nail 213, First end 202, Second end 203, First pressure relief part 201, Second pressure relief part 204, First bracket30 First opening 31 First receiving cavity 32 Extension 33 First extension wall 331 Second extension wall 332 First connector 40 Connecting hole 41 Second hole 42 Second bracket 50 Fourth opening 51 Second receiving cavity 52 Limiting protrusion 53 Circuit board 60 Second connector 70 Third hole 71 Blocking member 80 Through hole 80a First through hole segment 81 First through hole 811 First segment 812 Second segment 813 Second through hole segment 82 Second through hole 821 Third through hole segment 83 Third through hole 831 Fourth through hole segment 84 Fourth through hole 841 Connecting opening 85 First receiving space 101a First space 1011Second Space 1012 Second Containment Space 101b Third Space 101c Fifth Opening 101d First Channel 101 First Structural Component 102 First Exhaust Part 103 First Shielding Part 1031 Encapsulating Material 104 Second Structural Component 105 Second Opening 1051 Third Opening 1052 Connecting Recess 1053 Second Channel 106 Conductive Component 107 Insulating Component 108 Limiting Hole 1081 Second Exhaust Part 109 Second Shielding Part 1091 Third Structural Component 110 Fourth Structural Component 120 First Direction X Second Direction Y Third Direction Z Electrical Equipment 200

[0046] The following specific embodiments will further illustrate this application in conjunction with the above-described accompanying drawings. Detailed Implementation

[0047] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0048] When a component is considered to be "located" on another component, it can be directly on the other component or may also be interspersed with other components. When a component is considered to be "connected" to another component, it can be directly connected to the other component or may also be interspersed with other components.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "or / and" as used herein includes any and all combinations of one or more of the associated listed items.

[0050] It is understandable that the term "perpendicular" is used to describe an ideal state between two components. In actual production or use, two components can exist in a state that is approximately perpendicular or equal to each other. For example, combined with numerical description, perpendicularity can refer to the angle between two straight lines within the range of 90° ± 10°, the dihedral angle between two planes within the range of 90° ± 10°, or the angle between a straight line and a plane within the range of 90° ± 10°. The two components described as "perpendicular" do not have to be absolutely straight lines or planes; they can be approximately straight lines or planes. From a macroscopic perspective, if the overall direction of extension is a straight line or plane, the component can be considered a "straight line" or "plane".

[0051] Unless otherwise defined, the term "multiple" in this document, when used to describe the number of components, specifically means that the component is two or more.

[0052] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0053] Please refer to Figures 1 to 5. One embodiment of this application provides a battery pack 100, including a housing 10 and a cell assembly 20. The housing 10 includes a receiving space 10a, and the cell assembly 20 is disposed in the receiving space 10a. The cell assembly 20 includes a plurality of cells 21, and at least one cell 21 includes a first pressure relief portion 201.

[0054] In some embodiments, the battery pack 100 includes a first channel 101 and a first structural member 102, the first channel 101 being disposed in the receiving space 10a. The first structural member 102 is disposed between the cell assembly 20 and the housing 10, and the first structural member 102 is configured to be melted such that a first pressure relief portion 201 communicates with the first channel 101.

[0055] In some embodiments, the battery pack 100 includes a first vent 103, which is disposed in the housing 10 and communicates with a first channel 101.

[0056] By providing a first channel 101 inside the housing 10, and connecting the first exhaust section 103 to the first channel 101, when the cell 21 experiences thermal runaway or pressure relief, the first structural component 102 is melted by the high-temperature gas and / or sparks ejected from the first pressure relief section 201, thereby connecting the first pressure relief section 201 to the first channel 101, which is beneficial for pressure relief and improves the safety of the battery pack 100.

[0057] Referring to Figures 3 and 5, in some embodiments, the housing 10 includes a lower shell 11 and a top cover 12 arranged along a first direction X, the lower shell 11 being connected to the top cover 12 and forming a receiving space 10a.

[0058] In some embodiments, the lower shell 11 includes a first sidewall 111, a second sidewall 112, a third sidewall 113, a fourth sidewall 114, and a bottom wall 115. The first sidewall 111 and the second sidewall 112 are arranged along a second direction Y, and the third sidewall 113 and the fourth sidewall 114 are arranged along a third direction Z. The first sidewall 111 connects the third sidewall 113 and the fourth sidewall 114, the second sidewall 112 connects the third sidewall 113 and the fourth sidewall 114, the bottom wall 115 connects the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114, and the top cover 12 connects the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0059] Please refer to Figures 3 to 5. In some embodiments, the battery pack 100 includes a potting compound 104. The potting compound 104 is disposed in the receiving space 10a. The potting compound 104 bonds the cell assembly 20, the first structural member 102 and the housing 10, so as to facilitate fixing the cell assembly 20.

[0060] Optionally, the potting compound 104 is used to bond the cell assembly 20, the first structural member 102, the first sidewall 111, the second sidewall 112, the third sidewall 113, the fourth sidewall 114 and the bottom wall 115, which is beneficial for fixing the cell assembly 20.

[0061] In some embodiments, the potting compound 104 is formed by injecting an insulating material into the receiving space 10a and curing it. Optionally, the insulating material includes, but is not limited to, polyurethane, epoxy, silicone, polyvinyl chloride, etc.

[0062] Please refer to Figures 4, 7, and 8. In some embodiments, the battery pack 100 includes a first support 30, and the cell assembly 20 is connected to the first support 30. The first support 30 includes a first opening 31, and a first pressure relief portion 201 communicates with the first opening 31.

[0063] In some embodiments, the first bracket 30 is connected to the first structural member 102, and the first structural member 102 closes the first opening 31, reducing the occurrence of the first opening 31 being blocked by the potting compound 104 entering the first opening 31, or reducing the occurrence of the first pressure relief part 201 being unable to open by the potting compound 104 entering the first opening 31, which is beneficial for pressure relief.

[0064] In some embodiments, the first support 30 includes a plurality of first receiving cavities 32, each of which corresponds to a battery cell 21. A portion of the battery cell 21 is disposed in the first receiving cavity 32, and the first opening 31 communicates with the first receiving cavity 32.

[0065] In some embodiments, the first support 30 includes a plurality of first receiving cavities 32, at least two of the first receiving cavities 32 are connected, and each first receiving cavity 32 contains a battery cell 21.

[0066] In some embodiments, the first bracket 30 is integrally formed, and multiple battery cells 21 are connected to the first bracket 30 to facilitate the installation and fixation of the battery cell assembly 20.

[0067] In some embodiments, the bottom wall 115 and the cell assembly 20 are arranged along a first direction X, and the first structural member 102 is disposed between the first support 30 and the bottom wall 115. The cell assembly 20 and the first support 30 compress the first structural member 102 under the action of gravity, which helps to reduce the amount of potting compound 104 entering the first opening 31.

[0068] In some embodiments, a portion of the first structural member 102 is disposed in the first opening 31, further reducing the amount of potting compound 104 entering the first opening 31. Under the weight of the cell assembly 20 and the first support 30, the first structural member 102 deforms, causing a portion of the first structural member 102 to bulge out and be disposed in the first opening 31. Optionally, the first structural member 102 includes foam.

[0069] In some embodiments, the potting compound 104 bonds the cell assembly 20, the first bracket 30, the housing 10, and the first structural member 102, which is beneficial for fixing the first bracket 30 and the cell assembly 20.

[0070] Referring to Figure 9, in some embodiments, the battery cell 21 includes a first end 202 and a second end 203 arranged along a first direction X. A first pressure relief portion 201 is located at the first end 202.

[0071] In some embodiments, the battery cell 21 includes a battery cell housing 211 and a sealing pin 212. The battery cell housing 211 includes a first hole 2111, which is configured to inject electrolyte and vent air during formation. The sealing pin 212 is welded to the battery cell housing 211 to seal the first hole 2111, and the sealing pin 212 and the first hole 2111 form a first pressure relief portion 201. When the battery cell 21 experiences thermal runaway or pressure relief, the welded position between the sealing pin 212 and the battery cell housing 211 opens, or the sealing pin 212 breaks, causing the first hole 2111 to communicate with the first opening 31.

[0072] In some embodiments, the battery cell 21 further includes a rubber stud 213, which blocks and seals the first hole 2111. A sealing stud 212 covers the rubber stud 213 and is welded to the battery cell housing 211. The first hole 2111, the rubber stud 213, and the sealing stud 212 form a first pressure relief portion 201. When the battery cell 21 experiences thermal runaway or pressure relief, the rubber stud 213 opens, the welded position of the sealing stud 212 to the battery cell housing 211 opens, or the sealing stud 212 bursts, allowing the first hole 2111 to communicate with the first opening 31.

[0073] Referring to Figure 4, in some embodiments, at least part of the first pressure relief section 201 is spaced apart from the first structural member 102. When the cell 21 experiences thermal runaway or pressure relief, the gap h1 between the first pressure relief section 201 and the first structural member 102 can provide a space for the sealing nail 212 to flip or burst, facilitating communication between the first hole 2111 and the first opening 31, and also facilitating the containment of high-temperature and high-pressure gas, causing the part of the first structural member 102 that seals the first opening 31 to melt, which is beneficial for pressure relief and improves the safety of the battery pack 100.

[0074] In some embodiments, 0.5mm≤h1≤5mm is beneficial for accommodating the sealing nail 212, providing a flipping space or bursting space for the sealing nail 212, and facilitating communication between the first hole 2111 and the first opening 31.

[0075] Optionally, h1 can be any one or any combination of two of the following: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, and 5mm.

[0076] In some embodiments, at least a portion of the first pressure relief section 201 is exposed in the first opening 31, so that the first pressure relief section 201 can relieve pressure through the first opening 31.

[0077] Optionally, along the first direction X, the first pressure relief part 201 is exposed in the first opening 31, which facilitates the opening of the welding position between the sealing nail 212 and the battery cell housing 211, or facilitates the bursting of the sealing nail 212, which is beneficial for pressure relief.

[0078] In some embodiments, the first bracket 30 is provided with an extension 33, a first opening 31 is provided in the extension 33, the extension 33 is connected to the inner surface of the first receiving cavity 32, the extension 33 is spaced apart from the first structural member 102, and the battery cell 21 is connected to the extension 33.

[0079] In some embodiments, the extension 33 includes a first extension wall 331 and a second extension wall 332. The first extension wall 331 is disposed around the inner surface of the first receiving cavity 32, increasing the contact area between the extension 33 and the battery cell 21, which is beneficial for supporting the battery cell 21. The second extension wall 332 is connected to the first extension wall 331 and the first structural member 102. The second extension wall 332 is disposed around the first structural member 102 in a circumferential direction and forms a first opening 31.

[0080] Please refer to Figures 3, 10 to 12. In some embodiments, the battery pack 100 includes a second structural member 105, which is disposed in the receiving space 10a. The second structural member 105 is connected to the first structural member 102. The second structural member 105 has a first channel 101 and a second opening 1051 communicating with the first channel 101. The first structural member 102 closes the second opening 1051 to reduce the entry of potting compound 104 into the first channel 101 from the second opening 1051, thus preventing blockage of the first channel 101 and facilitating pressure relief.

[0081] In some embodiments, the second structural member 105 is provided with a third opening 1052 that communicates with the first channel 101. Along the first direction X, the third opening 1052 extends beyond the potting compound 104, reducing the possibility of the potting compound 104 entering the first channel 101 from the third opening 1052 and causing blockage of the first channel 101, which is beneficial for pressure relief.

[0082] In some embodiments, the potting compound 104 bonds the second structural member 105, the housing 10, the first structural member 102, the first bracket 30, and the battery cell assembly 20, which is beneficial for fixing the second structural member 105.

[0083] In some embodiments, the second structural member 105 is bonded to one of the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114, which facilitates fixing the position of the second structural member 105 before injecting the potting compound 104, reducing the movement of the second structural member 105 during the injection of the potting compound 104, which would cause the potting compound 104 to enter the first opening 31 and / or the second opening 1051, causing the first channel 101 and / or the first opening 31 to be blocked, which is beneficial for pressure relief.

[0084] In some embodiments, taking the second structural member 105 bonded to the second sidewall 112 as an example, the second structural member 105 is provided with a connecting recess 1053, and the second sidewall 112 is provided with a connecting protrusion 1121. The connecting recess 1053 is connected to the connecting protrusion 1121, which facilitates the limiting of the second structural member 105 and defines the installation position of the second structural member 105. It is understood that the structure of the connection between the second structural member 105 and the second sidewall 112 is not limited to the above-described concave-convex structure.

[0085] In some embodiments, the second structural member 105 is configured to melt at a first temperature, such that the space occupied by the second structural member 105 forms a first channel 101, thereby expanding the first channel 101, which is beneficial for pressure relief and increases the pressure relief rate.

[0086] Optionally, the material of the second structural member 105 may include foam or plastic.

[0087] In some embodiments, the second structural member 105 is integrally formed with the lower shell 11 or is separately disposed. Taking the connection of the second structural member 105 to the second sidewall 112 as an example, the second structural member 105 is welded to the second sidewall 112, and the second structural member 105 and the second sidewall 112 form a first channel 101. Optionally, the material of the second structural member 105 includes metal.

[0088] Please refer to Figures 12 and 13. In some embodiments, the battery pack 100 further includes a first connector 40. The first connector 40 is disposed in the receiving space 10a and connected to the lower shell 11, forming a first receiving space 101a with the lower shell 11. The first receiving space 101a includes a first space 1011 and a second space 1012 that are separated.

[0089] In some embodiments, the cell assembly 20 is disposed in the first space 1011, and the cell assembly 20 and the first connector 40 are arranged along a first direction X. A second channel 106 is formed between the cell assembly 20 and the first connector 40, the second channel 106 connecting the first channel 101 and the second space 1012, and the first exhaust portion 103 connecting the second space 1012. When the cell 21 is depressurized, gas is ejected from the first depressurization portion 201, at least a portion of the gas enters the first channel 101 through the first opening 31, enters the second channel 106 from the first channel 101, enters the second space 1012 from the second channel 106, and is discharged from the first exhaust portion 103 to the outside of the battery pack 100.

[0090] Referring to Figures 6 and 15, in some embodiments, the lower housing 11 is provided with a plurality of fixing parts 11a, which are connected to at least two of the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114. The first connector 40 includes a connecting hole 41, and the battery pack 100 includes a fastener 100a that passes through the connecting hole 41 and is connected to the fixing parts 11a.

[0091] Please refer to Figures 7, 8, and 9 together. In some embodiments, the at least one cell 21 further includes a second pressure relief section 204. The second pressure relief section 204 is located at the second end 203.

[0092] In some embodiments, the battery pack 100 includes a second bracket 50 connected to the cell assembly 20, the second bracket 50 including a fourth opening 51, and a second pressure relief portion 204 communicating with the fourth opening 51.

[0093] In some embodiments, the second support 50 includes a plurality of second receiving cavities 52, each of which corresponds to a battery cell 21. A portion of the battery cell 21 is disposed in the second receiving cavity 52, and the fourth opening 51 communicates with the second receiving cavity 52.

[0094] In some embodiments, the second support 50 includes a plurality of second receiving cavities 52, at least two of the second receiving cavities 52 are connected, and each second receiving cavity 52 contains a battery cell 21.

[0095] In some embodiments, the second bracket 50 is integrally formed, and multiple battery cells 21 are connected to the second bracket 50 to facilitate the installation and fixation of the battery cell assembly 20.

[0096] In some embodiments, at least a portion of the second pressure relief portion 204 is exposed in the fourth opening 51, so that the second pressure relief portion 204 can relieve pressure through the fourth opening 51.

[0097] In some embodiments, the second pressure relief section 204 includes an explosion-proof valve. In some embodiments, the explosion-proof valve is provided with grooves, which form a weak point in the explosion-proof valve, allowing the valve to burst and release pressure under the action of high-pressure gas.

[0098] Please refer to Figures 11 and 14. In some embodiments, the battery pack 100 includes a plurality of conductive elements 107, which connect a plurality of battery cells 21, such that the plurality of battery cells 21 are connected in series and / or in parallel.

[0099] In some embodiments, along the first direction X, the second bracket 50 and the first connector 40 are spaced apart to insulate the conductive element 107 from the first connector 40, thereby reducing the risk of short circuit between the conductive element 107 and the first connector 40.

[0100] Please refer to Figures 7, 8, and 14. In some embodiments, the battery pack 100 includes an insulator 108 connected to the second bracket 50 and disposed between the second bracket 50 and the first connector 40, further insulating the conductive element 107 and the first connector 40, and further reducing the risk of short circuit between the conductive element 107 and the first connector 40.

[0101] In some embodiments, the insulating member 108 covers the fourth opening 51 and is configured to be lifted or melted by gas, thereby connecting the fourth opening 51 to the second channel 106. Under normal operating conditions of the battery pack 100, the insulating member 108 is disposed between the second support 50 and the first connector 40, insulating the conductive member 107 and the first connector 40. In the event of thermal runaway or depressurization of the battery pack 100, initially, the insulating member 108 may be lifted by gas, allowing gas to enter the second channel 106 through the fourth opening 51. During sustained depressurization, the insulating member 108 is at least partially melted by sparks or high-temperature gas, thereby connecting the fourth opening 51 to the second channel 106.

[0102] In some embodiments, the insulating member 108 and the first connector 40 are spaced apart along a first direction X, and the insulating member 108 and the first connector 40 have a gap h2. The gap h2 provides space for the insulating member 108 to move toward the first connector 40, so that the fourth opening 51 can connect to the second channel 106.

[0103] In some embodiments, 0.5mm≤h2≤5mm facilitates providing space for the insulating member 108 to move toward the first connector 40, and facilitates the fourth opening 51 to connect to the second channel 106, which is beneficial for pressure relief.

[0104] Optionally, h2 can be any one or any combination of two of the following: 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, and 5mm.

[0105] In some embodiments, the material of the insulating element 108 includes polycarbonate.

[0106] In some embodiments, the second bracket 50 includes a limiting protrusion 53, and the insulating member 108 includes a limiting hole 1081, with the limiting protrusion 53 disposed in the limiting hole 1081.

[0107] In some embodiments, the first connector 40 connects to the limiting protrusion 53 to limit the insulating member 108.

[0108] In some embodiments, two limiting protrusions 53 are provided, which are arranged diagonally to facilitate the installation of the insulating member 108 and to limit the insulating member 108.

[0109] Please refer to Figures 13 to 16. In some embodiments, the first connector 40 and the housing 10 also form a second receiving space 101b. The first connector 40 is provided with a second hole 42, which connects the second receiving space 101b and the first receiving space 101a.

[0110] In some embodiments, along the first direction X, the first connector 40 does not extend beyond the first sidewall 111, the second sidewall 112, the third sidewall 113, and the fourth sidewall 114. The first connector 40, the top cover 12, and part of the lower shell 11 form a second receiving space 101b, or the first connector 40 and the top cover 12 form a second receiving space 101b.

[0111] In some embodiments, the battery pack 100 further includes a second vent 109, which is configured such that gas discharged from the first pressure relief section 201 and / or the second pressure relief section 204 enters the second receiving space 101b through the second hole 42 and is discharged from the second vent 109 to the outside of the housing 10. The first vent 103 and the second vent 109 improve the pressure relief efficiency of the battery pack 100, which is beneficial to improving the safety of the battery pack 100.

[0112] In some embodiments, a second exhaust portion 109 is provided on the top cover 12.

[0113] In some embodiments, a first exhaust portion 103 is disposed on one of a first sidewall 111, a second sidewall 112, a third sidewall 113, and a fourth sidewall 114. The first exhaust portion 103 is configured such that at least a portion of the gas discharged from the first pressure relief portion 201 and / or the second pressure relief portion 204 is discharged from the first exhaust portion 103 to the outside of the housing 10. This application will describe an example where the first exhaust portion 103 is disposed on the first sidewall 111.

[0114] Please refer to Figure 2. In some embodiments, the first exhaust section 103 is provided with a first shield 1031. The first shield 1031 is connected to the first side wall 111 and covers the first exhaust section 103 to reduce the entry of external dust and moisture into the housing 10.

[0115] In some embodiments, the second exhaust portion 109 is provided with a second shield 1091, which is connected to the top cover 12 and covers the second exhaust portion 109 to reduce the entry of external dust and moisture into the housing 10.

[0116] In some embodiments, a plurality of through holes are formed on the first sidewall 111 to form a first exhaust portion 103.

[0117] In some embodiments, a plurality of through holes are formed on the top cover 12 to form a second exhaust portion 109.

[0118] In some embodiments, along the first direction X, the first connector 40 is located above the first pressure relief section 201. When the battery cell 21 experiences thermal runaway or pressure relief, high-temperature gas and / or sparks are ejected from the first pressure relief section 201 and act on the first connector 40, increasing the collision between the high-temperature gas and the first connector 40, and increasing the collision between the first connector 40 and the sparks, which is beneficial for annihilating the sparks. Optionally, the first connector 40 is a metal part. Optionally, the first connector 40 is a sheet metal part.

[0119] Referring to Figure 13, in some embodiments, the battery pack 100 includes a circuit board 60 disposed in the second receiving space 101b. The circuit board 60 is connected to the cell assembly 20. A first connector 40 is located between the cell 21 and the circuit board 60. The first connector 40 can block high-temperature gases and / or sparks from directly acting on the circuit board 60, which helps to protect the circuit board 60.

[0120] Optionally, the circuit board 60 includes a BMS (Battery Management System) component, which includes multiple electronic components that can perform functions such as control, protection, communication, power calculation, signal transmission, and power transmission of the battery cell assembly 20.

[0121] Optionally, circuit board 60 includes a flexible printed circuit board (FPC). Optionally, circuit board 60 includes a printed circuit board (PCB).

[0122] Referring to Figures 17 and 18, in some embodiments, the battery pack 100 includes a second connector 70 disposed in a second receiving space 101b. The second connector 70 has a third hole 71 configured to allow gas to flow through to a second exhaust portion 109. Increasing the collision between the gas and the second connector 70, and thus increasing the collision between the second connector 70 and Martian sparks, is beneficial for annihilating Martian sparks. Optionally, the second connector 70 is a metal component. Optionally, the second connector 70 is a metal mesh.

[0123] In some embodiments, the battery pack 100 includes a third structural member 110 connected to a top cover 12. The third structural member 110 and the top cover 12 form a third space 101c and a fifth opening 101d communicating with the third space 101c. A second exhaust portion 109 communicates with the third space 101c, and a second connector 70 is disposed in the fifth opening 101d. Gas enters the third space 101c through a third hole 71 and exits from the second exhaust portion 109.

[0124] In some embodiments, the first exhaust portion 103 is configured to exhaust at a first pressure threshold, and the second exhaust portion 109 is configured to exhaust at a second pressure threshold, wherein the first pressure threshold is less than the second pressure threshold.

[0125] In some embodiments, the exhaust rate of the first exhaust section 103 is greater than the exhaust rate of the second exhaust section 109.

[0126] When cell 21 is depressurized, the first venting section 103 depressurizes before the second venting section 109. When the gas generation rate in the battery pack 100 is greater than the gas exhaust rate of the first venting section 103, the second venting section 109 and the first venting section 103 depressurize together to improve the depressurization efficiency.

[0127] Referring to Figures 6, 13, and 19, in some embodiments, the battery pack 100 includes a barrier 80, at least a portion of which is disposed in the second space 1012. The barrier 80 includes a through-hole 80a communicating with the first vent 103. When the battery cell 21 experiences thermal runaway or depressurization, high-temperature gas and / or sparks act on the barrier 80. The gas collides with the barrier 80 and passes through the through-hole 80a. The through-hole 80a can block some particulate matter in the high-temperature gas and annihilate sparks, reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0128] In some embodiments, the lower shell 11 includes a first connecting wall 116, which connects to a first side wall 111, and the first side wall 111 and the first connecting wall 116 form the second space 1012.

[0129] In some embodiments, the first connecting wall 116 includes two first walls 1161 and a second wall 1162 connecting the two first walls 1161. The first walls 1161, the second wall 1162, and the first side wall 111 enclose a second space 1012. Along the first direction X, the first wall 1161 extends beyond the second wall 1162, and the first wall 1161 and the second wall 1162 form a sixth opening 116a. A portion of the blocking member 80 is disposed in the sixth opening 116a, and high-temperature gas and / or sparks enter the second space 1012 through the sixth opening 116a.

[0130] In some embodiments, the first wall 1161 is integrally formed with the first side wall 111, and the second wall 1162 is welded to the first wall 1161.

[0131] In some embodiments, the two first walls 1161 and the second wall 1162 are integrally disposed, and the first wall 1161 is welded to the first side wall 111.

[0132] In some embodiments, the blocking member 80 includes a first through-hole section 81, which is located at the sixth opening 116a. The first through-hole section 81 includes a plurality of first through-holes 811 through which high-temperature gas passes. The first through-hole section 81 can block some of the particulate matter in the high-temperature gas, thereby reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0133] In some embodiments, the blocking member 80 includes a second through-hole segment 82, which includes a plurality of second through-holes 821. A first through-hole 811 is closer to the sixth opening 116a, and the area of ​​at least one first through-hole 811 is larger than any of the second through-holes 821. When gas passes through the smaller second through-hole 821, smaller particles in the gas can be further blocked, reducing the risk of spark leakage caused by thermal runaway of the battery cell 21.

[0134] In some embodiments, the blocking member 80 includes a third through-hole segment 83, which includes a plurality of third through-holes 831. Second through-holes 821 are closer to the sixth opening 116a, and at least one second through-hole 821 has an area larger than any one of the third through-holes 831. When gas passes through the smaller third through-holes 831, smaller particles in the gas can be further blocked, reducing the risk of spark leakage due to thermal runaway of the battery cell 21.

[0135] In some embodiments, a first through-hole segment 81, a second through-hole segment 82, and a third through-hole segment 83 are arranged sequentially. The second through-hole segment 82 connects the first through-hole segment 81 and the third through-hole segment 83.

[0136] In some embodiments, the blocking member 80 includes a fourth through-hole section 84, which is connected to the third through-hole section 83. The fourth through-hole section 84 includes a plurality of fourth through-holes 841. The area of ​​the fourth through-hole 841 is larger than the area of ​​any second through-hole 821 and any third through-hole 831, which is beneficial for gas to pass through the fourth through-hole 841 and improves the pressure relief efficiency.

[0137] In some embodiments, the area of ​​the fourth through hole 841 is larger than the area of ​​any one of the first through holes 811, which is beneficial for pressure relief.

[0138] In some embodiments, the first through hole 811, the second through hole 821, the third through hole 831 and the fourth through hole 841 can be at least one of elongated holes, round holes and polygonal holes.

[0139] In some embodiments, the blocking element 80 is a metal element, which is beneficial for annihilating the sparks.

[0140] In some embodiments, the first sidewall 111 is provided with a first connecting portion 1111 facing the first connecting wall 116, and the blocking member 80 is provided with a connecting opening 85, which connects to the first connecting portion 1111, so as to fix the blocking member 80 to the second space 1012.

[0141] In some embodiments, the first connecting portion 1111 is a cylindrical structure, and the blocking member 80 is held in place by the connecting opening 85.

[0142] In some embodiments, a connecting opening 85 is provided in the first through hole segment 81, and a connecting opening 85 is provided in the fourth through hole segment 84. The two ends of the blocking member 80 are fixed to the second space 1012 through the connecting openings 85 located at both ends of the blocking member 80.

[0143] In some embodiments, a portion of the connecting opening 85 is located in the second through hole section 82, and a portion of the connecting opening 85 is located in the third through hole section 83. The middle portion of the blocking member 80 is fixed to the second space 1012 through the connecting opening 85 in the middle portion of the blocking member 80.

[0144] In some embodiments, the first through-hole segment 81 includes a first segment 812 and a second segment 813 connecting the first segment 812. A connecting opening 85 is provided in the first segment 812, and the second segment 813 is connected to the second through-hole segment 82. The first segment 812 connects the two first walls 1161 and the first connecting portion 1111. The second segment 813 connects the first wall 1161 and the second wall 1162.

[0145] In some embodiments, along the first direction X, the second wall 1162 includes a first end face 1162a, and the second segment 813 connects to the first end face 1162a, supporting the blocking member 80 and facilitating the fixation of the blocking member 80.

[0146] In some embodiments, the battery pack 100 includes a fourth structural member 120 located between the first connector 40 and the first segment 812, connecting the first connector 40 and the first segment 812. The fourth structural member 120 is pressed against the first segment 812 by the first connector 40, further securing the blocking member 80. Optionally, the fourth structural member 120 includes foam.

[0147] Referring to Figure 20, this application also provides an electrical device 200 employing the aforementioned battery pack 100. In one embodiment, the electrical device 200 of this application may be, but is not limited to, electronic devices, drones, backup power supplies, electric vehicles, electric motorcycles, electric-assisted bicycles, power tools, large household battery modules, etc.

[0148] Those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and variations made to the above embodiments within the spirit and essence of this application fall within the scope of this application's disclosure.

Claims

1. A battery pack, characterized in that, include: The casing, including the containment space; The first passage is located within the aforementioned containment space; A battery cell assembly is disposed in the receiving space, the battery cell assembly comprising a plurality of battery cells, at least one of the battery cells comprising a first pressure relief section; A first structural component is disposed between the battery cell assembly and the housing, and the first structural component is configured to be melted so that the first pressure relief part is connected to the first channel. A first exhaust section is provided in the housing, and the first exhaust section is connected to the first channel.

2. The battery pack as described in claim 1, characterized in that, It also includes a first bracket, the battery cell assembly is connected to the first bracket, the first bracket includes a first opening, the first pressure relief part communicates with the first opening, the first bracket is connected to the first structural member, and the first structural member closes the first opening.

3. The battery pack as described in claim 2, characterized in that, The first bracket has an extension, the first opening is located in the extension, the battery cell is connected to the extension, and at least a portion of the first pressure relief portion is exposed in the first opening and spaced apart from the first structural member.

4. The battery pack as described in any one of claims 2 to 3, characterized in that, The housing includes a bottom wall, the bottom wall and the battery cell assembly are arranged along a first direction, and the first structural member is disposed between the first bracket and the bottom wall; It also includes a potting compound, which is disposed in the receiving space and bonds the cell assembly, the first bracket, the first structural member and the housing.

5. The battery pack as described in claim 4, characterized in that, It also includes a second structural member disposed in the receiving space, the second structural member being connected to the first structural member, the second structural member having the first channel and a second opening communicating with the first channel, and the first structural member closing the second opening.

6. The battery pack as described in claim 5, characterized in that, The second structural component has a third opening that connects to the first channel, and the third opening extends beyond the potting compound along the first direction.

7. The battery pack according to any one of claims 1 to 6, characterized in that, The battery cell includes a battery cell housing and a sealing pin. The battery cell housing includes a first hole, and the sealing pin seals the first hole. The sealing pin and the first hole form at least a portion of the first pressure relief section.

8. The battery pack according to any one of claims 1 to 7, characterized in that, It also includes a first connector, which is disposed in the receiving space and connected to the housing, and forms a first receiving space with the housing. The first receiving space includes a first space and a second space that are separated. The battery cell assembly is disposed in the first space, and the battery cell assembly and the first connector are arranged along the first direction; A second channel is formed between the battery cell assembly and the first connector, the second channel connecting the first channel and the second space, and the first exhaust portion connecting the second space.

9. The battery pack according to any one of claims 1 to 8, characterized in that, The at least one of the battery cells further includes a second pressure relief section; It also includes a second bracket, which is connected to the cell assembly. The second bracket includes a fourth opening, and the second pressure relief section communicates with the fourth opening.

10. The battery pack as claimed in claim 9, characterized in that, The second pressure relief section includes an explosion-proof valve.

11. The battery pack as described in claim 9 or 10, characterized in that, It also includes an insulating component, which is connected to the second bracket and disposed between the second bracket and the first connecting component; The insulating element covers the fourth opening and is configured to be lifted or melted to connect the fourth opening to the second channel.

12. The battery pack as claimed in claim 11, characterized in that, The insulating component and the first connecting component are spaced apart along a first direction.

13. The battery pack as described in claim 11 or 12, characterized in that, The second bracket has a limiting protrusion at one end facing away from the battery cell, and the insulating component has a limiting hole, with the limiting protrusion located in the limiting hole.

14. The battery pack according to any one of claims 9 to 13, characterized in that, The first connector and the housing also form a second receiving space. The first connector is provided with a second hole, which connects the second receiving space and the first receiving space. It also includes a second exhaust section, which is configured such that gas discharged from the first pressure relief section and / or the second pressure relief section enters the second receiving space through the second hole and is discharged from the second exhaust section to the outside of the housing.

15. The battery pack as claimed in claim 14, characterized in that, The first exhaust section is configured to exhaust at a first pressure threshold, and the second exhaust section is configured to exhaust at a second pressure threshold, wherein the first pressure threshold is less than the second pressure threshold.

16. The battery pack as claimed in claim 14, characterized in that, It also includes a second connector, which has a third hole configured to allow gas to flow through to the second exhaust section.

17. The battery pack as claimed in claim 8, characterized in that, It also includes a blocking member disposed in the second space, the blocking member including a through hole communicating with the first exhaust section.

18. The battery pack as claimed in claim 17, characterized in that, The blocking member includes a first through-hole section and a second through-hole section connecting the first through-hole section. The first through-hole section includes a plurality of first through-holes, and the second through-hole section includes a plurality of second through-holes. The second through-holes are closer to the first exhaust portion, and the area of ​​at least one of the first through-holes is larger than that of any one of the second through-holes.

19. The battery pack according to any one of claims 1 to 4, characterized in that, It also includes a second structural member disposed in the receiving space, the second structural member being configured to melt at a first temperature, such that the space occupied by the second structural member forms the first channel.

20. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1 to 19.

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