Sealing member, battery module and electrical device

Abstract

A sealing member, a battery module (100) and an electrical device (200). The battery module (100) comprises a housing (10), a battery cell (20), a first sealing member (30), and a second sealing member (40). The housing (10) is provided with a first through hole (10a), a second through hole (10b) and an accommodation space (10c), the first through hole (10a) being communicated with the accommodation space (10c), and the second through hole (10b) being communicated with the accommodation space (10c). The battery cell (20) is arranged in the accommodation space (10c). The first sealing member (30) is connected to the housing (10) and seals the first through hole (10a). The second sealing member (40) is connected to the housing (10) and seals the second through hole (10b). The first sealing member (30) is configured to melt and / or lose adhesiveness when the internal temperature of the battery module (100) reaches a first temperature, so as to form a first pressure relief channel, and the second sealing member (40) is configured to melt and / or lose adhesiveness when the internal temperature of the battery module (100) reaches a second temperature, so as to form a second pressure relief channel, the second temperature being higher than the first temperature. The second temperature of the second sealing member (40) being higher than the first temperature of the first sealing member (30) facilitates pressure relief and reduces the risk of short circuit between the battery cell (20) and the housing (10), thus improving the safety and pressure relief reliability of the battery module (100).

Description

Seals, battery modules and electrical equipment Technical Field

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

[0002] Batteries are currently widely used in drones, electric vehicles, power tools, and other fields. Hard-shell batteries are typically equipped with pressure relief holes, but existing hard-shell batteries suffer from premature or late pressure relief, resulting in low safety and reliability.

[0003] Summary of the Invention

[0004] In view of this, it is necessary to provide a seal, a battery module and an electrical device that can achieve reliable pressure relief and improve the safety of the battery module.

[0005] An embodiment of the present application provides a battery module, comprising a shell, a battery cell, a first seal and a second seal. The shell is provided with a first through hole, a second through hole and a receiving space. The first through hole is connected to the receiving space. The second through hole is connected to the receiving space. The battery cell is provided in the receiving space. The first seal is connected to the shell and closes the first through hole. The second seal is connected to the shell and closes the second through hole. The first seal is configured to melt and / or debond to form a first pressure relief channel when the internal temperature of the battery module reaches a first temperature. The second seal is configured to melt and / or debond to form a second pressure relief channel when the internal temperature of the battery module reaches a second temperature. The second temperature is greater than the first temperature. The higher the temperature of the battery module, the higher the gas production efficiency. By setting the first through hole and the second through hole, the second temperature of the second seal is greater than the first temperature of the first seal, thereby matching the different gas production rates of the battery module at different temperatures, which is beneficial to pressure relief. By arranging a first seal in the first through hole and a second seal in the second through hole, a sufficient pressure relief area can be ensured. At the first temperature, it is beneficial to reduce the pressure relief area of ​​the battery module, thereby reducing the risk of external water vapor and oxygen entering the battery cell when the battery module is pressure-relieved at the first temperature, causing accelerated side reactions in the battery cell and leading to intensified combustion. At the second temperature, the second pressure relief channel can increase the pressure relief area and pressure relief rate, reduce the risk of short circuit between the battery cell and the casing, and improve the safety of the battery module and the reliability of pressure relief.

[0006] Optionally, in some embodiments of the present application, the housing includes a bottom wall and side walls. The side walls are connected to the bottom wall. The first sealing member and the side walls are arranged along a first direction. The first through hole extends through the side wall. The second through hole extends through the side wall. The first direction is the length or width of the battery module, which reduces the risk of the battery cell blocking the first and second through holes and facilitates pressure relief.

[0007] Optionally, in some embodiments of the present application, the sidewall includes a first sidewall. The battery module includes an electrical connector. The electrical connector connects to the battery cells and extends from the first sidewall. A first space is defined between the first sidewall and the battery cells. A first through-hole extends through the first sidewall. A second through-hole extends through the first sidewall. By locating the first and second through-holes and the electrical connector on the same sidewall, the first space is utilized to facilitate pressure relief.

[0008] Optionally, in some embodiments of the present application, the sidewall includes a first sidewall and a second sidewall. The battery module includes an electrical connector. The electrical connector connects the battery cells and extends from the first sidewall. The first sidewall and the second sidewall are aligned along a first direction. The first through hole extends through the second sidewall, and the second through hole extends through the second sidewall, thereby facilitating protection of the protective plate during pressure relief or when external moisture intrudes into the housing, thereby reducing the risk of short circuiting the protective plate.

[0009] Optionally, in some embodiments of the present application, the first sealing member includes a first sealing portion. The first sealing portion is bonded to the housing, which can reduce material costs and process steps.

[0010] Optionally, in some embodiments of the present application, the first sealing member includes a first sealing portion and a first connecting portion. The first connecting portion is adhesively connected to the first sealing portion. The first sealing portion is adhesively bonded to the housing. Providing the first connecting portion can reduce the infiltration of water and moisture into the receiving space through the first sealing portion, thereby reducing the risk of short circuits.

[0011] Optionally, in some embodiments of the present application, the first sealing member includes a first connecting portion, a first sealing portion, and a first fixing portion. The first sealing member is connected to the first connecting portion and the first fixing portion on either side. The first fixing portion is connected to the housing. The first fixing portion has a first opening that communicates with the first through-hole. The first fixing portion enhances the connection strength between the first sealing member and the housing, reducing the risk of air leakage.

[0012] Optionally, in some embodiments of the present application, the area S1 of the first opening satisfies 0.008 mm 2 ≤S1≤16mm 2 On the basis that the pressure relief rate corresponding to the pressure relief area S1 is not less than the gas production rate, the area of ​​the pressure relief area S1 can be reduced, so that less external water vapor and oxygen enter the battery module, and the risk of accelerated side reactions and combustion of the battery cells is reduced.

[0013] Optionally, in some embodiments of the present application, the first sealing portion includes a first adhesive layer, a first supporting layer, and a second adhesive layer. The first adhesive layer adhesively connects the first connecting portion and the first supporting layer. The second adhesive layer adhesively connects the first fixing portion and the first supporting layer.

[0014] Optionally, in some embodiments of the present application, the first connecting portion and the first fixing portion include at least one metal material selected from the group consisting of aluminum, nickel, and stainless steel.

[0015] Optionally, in some embodiments of the present application, the thickness h1 of the first connecting portion satisfies 0.03 mm ≤ h1 ≤ 1.00 mm, which is beneficial for reducing the space occupied by the first connecting portion.

[0016] Optionally, in some embodiments of the present application, the first sealing portion is provided with a first sealing portion opening. The first sealing portion opening is connected to the first opening. Providing the first sealing portion opening facilitates faster pressure relief, reduces the risk of clogging the first through hole after the first sealing portion melts, and helps reduce material costs.

[0017] Optionally, in some embodiments of the present application, the second sealing member includes a second sealing portion, and the second sealing portion is bonded to the housing, which can reduce material costs and process steps.

[0018] Optionally, in some embodiments of the present application, the second sealing member includes a second sealing portion and a second connecting portion. The second connecting portion is adhesively connected to the second sealing portion. The second sealing portion is adhesively bonded to the housing. Providing the second connecting portion can reduce the infiltration of water and moisture into the receiving space through the second sealing portion, thereby reducing the risk of short circuits.

[0019] Optionally, in some embodiments of the present application, the second sealing member includes a second connecting portion, a second sealing portion, and a second fixing portion. The second sealing member is connected to the second connecting portion and the second fixing portion on both sides. The second fixing portion is connected to the housing. The second fixing portion has a second opening. The second opening communicates with the second through hole. The second fixing portion can enhance the connection strength between the second sealing member and the housing, reducing the risk of air leakage.

[0020] Optionally, in some embodiments of the present application, the area of ​​the second opening is larger than that of the first opening, thereby increasing the pressure relief area and facilitating pressure relief.

[0021] Optionally, in some embodiments of the present application, the area S2 of the second opening satisfies 0.07 mm 2 ≤S2≤25mm 2 On the basis that the pressure relief rate corresponding to the pressure relief area S2 is not less than the gas production rate, the larger the pressure relief area S2, the higher the pressure relief rate, which can quickly relieve pressure, discharge gas and heat, and reduce the risk of short circuit between the battery cell and the shell caused by further deformation of the shell.

[0022] Optionally, in some embodiments of the present application, the diameter d1 of the first opening satisfies 0.1 mm ≤ d1 ≤ 4 mm, which can reduce the intrusion of water and water vapor into the receiving space while ensuring the pressure relief effect, thereby reducing the risk of short circuit.

[0023] Optionally, in some embodiments of the present application, the diameter d2 of the second opening satisfies 0.3mm≤d2≤5mm, which can reduce the intrusion of water and water vapor into the receiving space while ensuring the pressure relief effect, thereby reducing the risk of short circuit.

[0024] Optionally, in some embodiments of the present application, along the first direction, the projected area of ​​the second through hole is greater than or equal to the projected area of ​​the first through hole, thereby ensuring the pressure relief area and pressure relief rate of the battery module at the second temperature.

[0025] Optionally, in some embodiments of the present application, the diameter D1 of the first through hole satisfies 0.5 mm ≤ D1 ≤ 5.5 mm.

[0026] Optionally, in some embodiments of the present application, a diameter D2 of the second through hole satisfies 0.5 mm ≤ D2 ≤ 5.5 mm.

[0027] Optionally, in some embodiments of the present application, the first temperature T1 satisfies 95° C. ≤ T1 ≤ 125° C. to achieve pressure relief.

[0028] Optionally, in some embodiments of the present application, the first temperature T1 satisfies 105°C ≤ T1 ≤ 120°C, which can reduce air leakage during normal use of the battery module, and is beneficial to the stability of the battery module during normal use and timely pressure relief when the first temperature is reached.

[0029] Optionally, in some embodiments of the present application, the second temperature T2 satisfies 115° C. ≤ T2 ≤ 145° C. to achieve pressure relief.

[0030] Optionally, in some embodiments of the present application, the second temperature T2 satisfies 120°C ≤ T2 ≤ 135°C, which can reduce air leakage during normal use of the battery module, and is beneficial to the stability of the battery module during normal use and timely pressure relief when the second temperature is reached.

[0031] Optionally, in some embodiments of the present application, the housing has a first recessed portion extending from the outside to the inside. The first through hole extends through a portion of the bottom surface of the first recessed portion. The first seal is disposed in the first recessed portion. The first seal does not protrude beyond the surface of the housing, facilitating connection between the electrical connector and an external device and reducing the space occupied by the first seal.

[0032] Optionally, in some embodiments of the present application, the housing is provided with a second recessed portion extending from the outside toward the inside. The second through hole extends through a portion of the bottom surface of the second recessed portion. The second sealing member is disposed in the second recessed portion. The second sealing member does not protrude beyond the surface of the housing, facilitating connection between the electrical connector and an external device and facilitating reduction in space occupied by the second sealing member.

[0033] Optionally, in some embodiments of the present application, the height of the first sealing member protruding from the first sidewall is less than the height of the electrical connector protruding from the first sidewall. The height of the second sealing member protruding from the first sidewall is less than the height of the electrical connector protruding from the first sidewall, thereby facilitating connection between the electrical connector and an external device and reducing the space occupied by the first sealing member.

[0034] Optionally, in some embodiments of the present application, the second connecting portion and the second fixing portion include at least one metal material selected from the group consisting of aluminum, nickel, and stainless steel.

[0035] An embodiment of the present application further provides an electrical device, comprising the battery in any one of the above embodiments.

[0036] One embodiment of the present application further provides a sealant for sealing a battery module housing. The sealant includes a sealing portion and a connecting portion. The connecting portion is bonded to the sealing portion, which is a sealant. The sealing portion is configured to lose adhesion and / or melt when heated to a first temperature, thereby facilitating pressure relief and improving the safety and reliability of the battery module.

[0037] Optionally, in some embodiments of the present application, the sealing member further includes a fixing portion, the fixing portion is arranged on a side of the sealing portion facing away from the connecting portion, and the fixing portion is provided with an opening.

[0038] Optionally, in some embodiments of the present application, the first temperature is 95°C to 125°C or 115°C to 145°C.

[0039] Optionally, in some embodiments of the present application, the material of the sealing portion includes any one of polypropylene, polyethylene, polyvinylidene fluoride, and polytetrafluoroethylene.

[0040] Optionally, in some embodiments of the present application, the connecting portion and the fixing portion include at least one metal material selected from the group consisting of aluminum, nickel, and stainless steel.

[0041] Optionally, in some embodiments of the present application, the shape of the sealing element includes any one of a racetrack shape, an ellipse, a rectangle, a circle, and a ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] FIG1 shows a schematic structural diagram of a battery module in some embodiments.

[0043] FIG. 2 shows an exploded schematic diagram of a battery module in some embodiments.

[0044] FIG3 is a schematic diagram showing a partial structure of a housing in some embodiments.

[0045] FIG4 shows a schematic structural diagram of a first sealing member in some embodiments.

[0046] FIG5 is a schematic structural diagram of a second sealing member in some embodiments.

[0047] FIG6 shows a schematic structural diagram of a battery module in some other embodiments.

[0048] FIG. 7 shows an exploded schematic diagram of the battery module in FIG. 6 .

[0049] FIG8 is a schematic cross-sectional view of a first sealing portion in some embodiments.

[0050] FIG9 shows a schematic structural diagram of the battery module in FIG6 from another perspective.

[0051] FIG10 shows a cross-sectional schematic diagram of the battery module in FIG6 .

[0052] FIG11 shows a schematic structural diagram of a battery module in some other embodiments.

[0053] FIG12 shows a schematic structural diagram of the battery module in FIG11 from another perspective.

[0054] FIG13 shows a cross-sectional schematic diagram of the battery module in FIG12 .

[0055] FIG. 14 shows a schematic structural diagram of the first sealing member in FIG. 11 .

[0056] FIG. 15 is a schematic structural diagram of a first sealing portion in some embodiments.

[0057] FIG16 shows a schematic structural diagram of the first side wall in some other embodiments.

[0058] FIG. 17 is a schematic structural diagram of a sealing member in some embodiments.

[0059] FIG18 shows a schematic structural diagram of electrical equipment in some embodiments.

[0060] Description of main component symbols:

[0061] Battery module 100 electrical connector 100a

[0062] Housing 10

[0063] First through hole 10a

[0064] Second through hole 10b

[0065] Storage space 10c

[0066] First space 10d

[0067] 1st recessed part 10e

[0068] 2nd recessed part 10f

[0069] Bottom wall 11

[0070] Side wall 12

[0071] First side wall 121

[0072] Second side wall 122

[0073] The third side wall 123

[0074] Fourth side wall 124

[0075] Top wall 13

[0076] Battery Cell 20

[0077] Electrode terminal 21

[0078] Electrode assembly 22

[0079] First seal 30

[0080] First sealing portion 31

[0081] First sealing portion opening 31a

[0082] First supporting layer 311

[0083] First adhesive layer 312

[0084] Second adhesive layer 313

[0085] First connecting portion 32

[0086] First fixing portion 33

[0087] First opening 331

[0088] Second sealing member 40

[0089] Second sealing portion 41

[0090] Second sealing portion opening 41a

[0091] Second connecting portion 42

[0092] Second fixing portion 43

[0093] Second opening 431

[0094] Seals 101

[0095] Sealing portion 101a

[0096] Connecting portion 101b

[0097] Fixed portion 101c

[0098] Opening 101d

[0099] Electrical equipment 200

[0100] First direction X

[0101] Second direction Y

[0102] The third direction Z

[0103] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. DETAILED DESCRIPTION

[0104] The following detailed description is illustrative and non-limiting. It is intended to provide a basic understanding of the present application and is not intended to identify the key or decisive elements of the present application or to limit the scope of protection. As long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any manner.

[0105] When a component is referred to as being “disposed on” another component, it can be directly disposed on the other component or there may be a component intervening therebetween. When a component is referred to as being “connected to” another component, it can be directly connected to the other component or there may be a component intervening therebetween.

[0106] It can be understood that the term "perpendicular" is used to describe the ideal state between two components. In actual production or use, there may be a state between the two components that is approximately perpendicular or equal. For example, combined with numerical descriptions, perpendicular can refer to the angle between two straight lines being in the range of 90°±10°, perpendicular can also refer to the dihedral angle between two planes being in the range of 90°±10°, and perpendicular can also refer to the angle between a straight line and a plane being in the range of 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.

[0107] Unless otherwise defined, the term "plurality" herein, when used to describe the number of components, specifically means that the components are two or more.

[0108] During the initial charge and discharge process of a liquid lithium-ion battery, the electrolyte reacts at the solid-liquid interface with the electrode, forming a passivation layer covering the surface of the electrode material. This passivation layer is an interfacial layer with the characteristics of a solid electrolyte: an electronic insulator but an excellent conductor of lithium ions. Lithium ions can freely embed and de-embedding through this passivation layer, hence the name "solid electrolyte interface," or SEI.

[0109] The following will describe some embodiments of the present application in conjunction with the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0110] Referring to Figures 1, 2, and 3, one embodiment of the present application provides a battery module 100 comprising a housing 10, a battery cell 20, a first seal 30, and a second seal 40. The housing 10 is provided with a first through-hole 10a, a second through-hole 10b, and a receiving space 10c. The first through-hole 10a communicates with the receiving space 10c, and the second through-hole 10b communicates with the receiving space 10c. The battery cell 20 is disposed in the receiving space 10c. The first seal 30 is connected to the housing 10 and seals the first through-hole 10a. The second seal 40 is connected to the housing 10 and seals the second through-hole 10b. The first seal 30 is configured to melt and / or debond to form a first pressure relief channel when the internal temperature of the battery module 100 reaches a first temperature. The second seal 40 is configured to melt and / or debond to form a second pressure relief channel when the internal temperature of the battery module 100 reaches a second temperature, the second temperature being greater than the first temperature.

[0111] The higher the temperature of the battery module 100, the higher the gas production efficiency. In this application, by setting the first through hole 10a and the second through hole 10b, the second temperature of the second seal 40 is greater than the first temperature of the first seal 30, which can match the different gas production rates of the battery module 100 at different temperatures, which is beneficial to pressure relief. By setting the first seal 30 in the first through hole 10a and the second seal 40 in the second through hole 10b, a sufficient pressure relief area can be guaranteed. At the first temperature, it is beneficial to reduce the pressure relief area of ​​the battery module 100, thereby reducing the risk of external water vapor and oxygen entering the battery cell 20 when the battery module 100 is pressure-relieved at the first temperature, causing the side reactions of the battery cell 20 to accelerate, resulting in increased combustion. At the second temperature, the second pressure relief channel can increase the pressure relief area and pressure relief rate, reduce the risk of short circuit between the battery cell 20 and the housing 10, and improve the safety of the battery module 100 and the reliability of pressure relief.

[0112] In some embodiments, the first temperature T1 satisfies 95°C ≤ T1 ≤ 125°C. The first sealing member 30 is configured to melt at any temperature within the range of T1, thereby forming a first pressure relief channel. The receiving space 10c is connected to the external environment through the first through hole 10a and the first pressure relief channel, thereby achieving pressure relief. T1 can be any one of 95°C, 96°C, 97°C, 98°C, 99°C, 100°C, 101°C, 102°C, 103°C, 104°C, 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C, and 125°C.

[0113] In some embodiments, T1 satisfies 105°C ≤ T1 ≤ 120°C, which can reduce leakage during normal use of the battery module 100, facilitate stability of the battery module 100 during normal use, and facilitate timely pressure relief when the first temperature is reached. T1 can be any one of 105°C, 106°C, 107°C, 108°C, 109°C, 110°C, 111°C, 112°C, 113°C, 114°C, 115°C, 116°C, 117°C, 118°C, 119°C, and 120°C.

[0114] In other embodiments, the first seal 30 is configured to begin to melt at the lowest temperature in the range T1 to form a portion of the first pressure relief channel, and to become a molten state when the highest temperature is reached to form a complete first pressure relief channel. The receiving space 10c is connected to the external environment through the first through hole 10a and the first pressure relief channel to achieve pressure relief.

[0115] In some other embodiments, when the first seal 30 is configured to be at the lowest temperature within the range T1, the adhesive force of the first seal 30 is reduced, and part or all of the first seal 30 is detached to form a part of the first pressure relief channel, thereby achieving pressure relief.

[0116] It is understood that the partial detachment of the first sealing member 30 and the melting of the first sealing member 30 may occur together.

[0117] In some embodiments, the second temperature T2 satisfies 115°C ≤ T2 ≤ 145°C. The second seal 40 is configured to become molten at any temperature within the T2 range, forming a second pressure relief channel. The receiving space 10c is connected to the external environment through the second through hole 10b and the second pressure relief channel to further relieve pressure. T2 can be any one of 115°C, 116°C, 117°C, 118°C, 119°C, 120°C, 121°C, 122°C, 123°C, 124°C, 125°C, 126°C, 127°C, 128°C, 129°C, 130°C, 131°C, 132°C, 133°C, 134°C, 135°C, 136°C, 137°C, 138°C, 139°C, 140°C, 141°C, 142°C, 143°C, 144°C, and 145°C.

[0118] In some embodiments, T2 satisfies 120°C ≤ T1 ≤ 135°C, which can reduce leakage during normal use of the battery module 100, facilitate stability of the battery module 100 during normal use, and facilitate timely pressure relief when the second temperature is reached. T2 can be any one of 120°C, 121°C, 122°C, 123°C, 124°C, 125°C, 126°C, 127°C, 128°C, 129°C, 130°C, 131°C, 132°C, 133°C, 134°C, and 135°C.

[0119] In other embodiments, the second seal 40 is configured to begin to melt at the lowest temperature in the T2 range to form a portion of the second pressure relief channel, and to become a molten state when the highest temperature is reached to form a complete second pressure relief channel. The receiving space 10c is connected to the external environment through the second through hole 10b and the second pressure relief channel, thereby achieving pressure relief.

[0120] In some other embodiments, when the second seal 40 is configured to be at the lowest temperature within the range T2, the adhesive force of the second seal 40 is reduced, and part or all of the second seal 40 is detached to form a partial second pressure relief channel, thereby achieving pressure relief.

[0121] It is understood that the partial detachment of the second sealing member 40 and the melting of the second sealing member 40 may occur together.

[0122] In some embodiments, the battery module 100 includes a third seal (not shown), and the housing 10 is provided with a third through hole, which is connected to the receiving space 10c. The third seal is connected to the housing 10 and closes the third through hole. The third seal is configured to melt to form a third pressure relief channel when the internal temperature of the battery module 100 reaches a third preset temperature. The third preset temperature is between the first temperature and the second temperature or the third preset temperature is greater than the second temperature. It is understandable that the number of through holes and seals corresponding to the through holes can be adjusted according to the pressure relief requirements.

[0123] 1 to 3 , the housing 10 includes a bottom wall 11 , side walls 12 and a top wall 13 . The side walls 12 connect the bottom wall 11 and the top wall 13 to form a receiving space.

[0124] In some embodiments, the shape of the first sealing member 30 includes any one of a racetrack shape, an ellipse, a rectangle, a circle, and a ring to adapt to the thickness of the sidewall 12 .

[0125] In some embodiments, the second sealing member 40 may have a shape including a racetrack, an ellipse, a rectangle, a circle, or a ring to adapt to the thickness of the sidewall 12 .

[0126] In some embodiments, the first through hole 10 a passes through either the bottom wall 11 or the top wall 13 .

[0127] In some embodiments, the second through hole 10 b passes through either the bottom wall 11 or the top wall 13 .

[0128] In some embodiments, the first seal 30 and the side wall 12 are arranged along the first direction X, and the first through hole 10a passes through the side wall 12. Setting the first through hole 10a on the side wall 12 can reduce the risk of the battery cell 20 blocking the first through hole 10a, which is conducive to pressure relief.

[0129] In some embodiments, the second seal 40 and the side wall 12 are arranged along the first direction X, and the second through hole 10b passes through the side wall 12. Setting the second through hole 10b on the side wall 12 can reduce the risk of the battery cell 20 blocking the second through hole 10b, which is further conducive to pressure relief.

[0130] In some embodiments, the first direction X is the length direction or the width direction of the battery module 100. This application takes the first direction X as the length direction of the battery module 100 as an example for description.

[0131] In some embodiments, the sidewall 12 includes a first sidewall 121, a second sidewall 122, a third sidewall 123, and a fourth sidewall 124. The first sidewall 121 and the second sidewall 122 are arranged along a first direction X, and the third sidewall 123 and the fourth sidewall 124 are arranged along a second direction Y. The first sidewall 121 connects the third sidewall 123 and the fourth sidewall 124, and the second sidewall 122 connects the third sidewall 123 and the fourth sidewall 124. The first direction X is perpendicular to the second direction Y.

[0132] In some embodiments, the bottom wall 11 and the top wall 13 are arranged along a third direction Z. The bottom wall 11 connects the first side wall 121, the second side wall 122, the third side wall 123, and the fourth side wall 124. The top wall 13 connects the first side wall 121, the second side wall 122, the third side wall 123, and the fourth side wall 124. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0133] In some embodiments, the first through hole 10 a is disposed on any one of the first side wall 121 , the second side wall 122 , the third side wall 123 , and the fourth side wall 124 .

[0134] In some embodiments, the second through hole 10 b is disposed on any one of the first side wall 121 , the second side wall 122 , the third side wall 123 , and the fourth side wall 124 .

[0135] In some embodiments, the battery module 100 includes an electrical connector 100a, which connects to the battery cell 20 and extends from the first sidewall 121. A first through-hole 10a extends through the first sidewall 121, and a second through-hole 10b extends through the first sidewall 121. A first space 10d is defined between the first sidewall 121 and the battery cell 20. Along the first direction X, the distance between the first sidewall 121 and the battery cell 20 is greater than the distance between the battery cell 20 and any of the second sidewall 122, the third sidewall 123, and the fourth sidewall 124. By locating the first and second through-holes 10a, 10b, and the electrical connector 100a on the same sidewall, the first space 10d is utilized to facilitate pressure relief. Optionally, the electrical connector 100a includes a terminal. In some embodiments, the first and second through-holes 10a, 10b, and the electrical connector 100a may also be located together on any of the second, third, and fourth sidewalls 122, 123, and 124.

[0136] In some embodiments, the battery module 100 includes a protective plate (not shown), which is provided on the side where the electrical connector 100a is located. The first through hole 10a passes through the second side wall 122, and the second through hole 10b passes through the second side wall 122, so that the first through hole 10a and the second through hole 10b are away from the protective plate, which is beneficial for protecting the protective plate during pressure relief or when external water vapor invades the housing 10, thereby reducing the risk of short circuit of the protective plate. Optionally, the first through hole 10a passes through the third side wall 123, and the second through hole 10b passes through the third side wall 123. Optionally, the first through hole 10a passes through the fourth side wall 124, and the second through hole 10b passes through the fourth side wall 124.

[0137] In some embodiments, the height of the first sealing member 30 protruding from the first side wall 121 is less than the height of the electrical connector 100a protruding from the first side wall 121, which facilitates the connection between the electrical connector 100a and external equipment and helps reduce the space occupied by the first sealing member 30.

[0138] In some embodiments, the height of the second seal 40 protruding from the first side wall 121 is less than the height of the electrical connector 100a protruding from the first side wall 121, which facilitates the connection between the electrical connector 100a and external equipment and further helps to reduce the space occupied by the second seal 40.

[0139] Referring to Figure 16, in some embodiments, the housing 10 is provided with a first recess 10e extending from the outside to the inside. The first through hole 10a extends through a portion of the bottom surface of the first recess 10e. The first seal 30 is provided in the first recess 10e. The first seal 30 does not extend beyond the surface of the housing 10, further facilitating connection between the electrical connector 100a and external devices and further helping to reduce the space occupied by the first seal 30. Optionally, the first recess 10e is provided in the first side wall 121. Optionally, the first recess 10e is provided in any one of the second side wall 122, the third side wall 123, and the fourth side wall 124.

[0140] Referring to Figure 16, in some embodiments, the housing 10 is provided with a second recess 10f extending from the outside to the inside. The second through hole 10b extends through a portion of the bottom surface of the second recess 10f. The second seal 40 is provided in the second recess 10f. The second seal 40 does not extend beyond the surface of the housing 10, further facilitating connection between the electrical connector 100a and external devices and further helping to reduce the space occupied by the second seal 40. Optionally, the second recess 10f is provided in the first side wall 121. Optionally, the second recess 10f is provided in any one of the second side wall 122, the third side wall 123, and the fourth side wall 124.

[0141] Referring to FIG. 2 , in some embodiments, the battery cell 20 includes an electrode terminal 21 and an electrode assembly 22 . The electrode assembly 22 is disposed in the receiving space 10 c , and the electrode terminal 21 is connected to the electrode assembly 22 .

[0142] In some embodiments, the electrode assembly 22 is formed by sequentially stacking a positive electrode sheet, a separator, and a negative electrode sheet, followed by winding. In other embodiments, the electrode assembly 22 may also be a laminated structure, where the positive electrode sheet, the separator, and the negative electrode sheet are sequentially stacked to form an electrode assembly unit, and multiple electrode assembly units are further stacked to form the electrode assembly 22.

[0143] In some embodiments, the electrode terminal 21 electrically connects the negative electrode tab and the electrical connector 100a, the positive electrode tab is electrically connected to the housing 10, and the electrical connector 100a is insulated from the housing 10. Optionally, the electrode terminal 21 is welded to the negative electrode tab and the electrical connector 100a. Optionally, the welding method includes laser welding, ultrasonic welding, etc.

[0144] In some embodiments, the electrode terminal 21 electrically connects the positive electrode tab and the electrical connector 100a, the negative electrode tab is electrically connected to the housing 10, and the electrical connector 100a is insulated from the housing 10. Optionally, the electrode terminal 21 is welded to the positive electrode tab and the electrical connector 100a. Optionally, the welding method includes laser welding, ultrasonic welding, etc.

[0145] In some embodiments, the electrode terminal 21 may be provided in plurality, and the battery module 100 includes an adapter, one end of the adapter being electrically connected to the plurality of electrode terminals 21, and the other end of the adapter being electrically connected to the electrical connector 100a. Optionally, welding includes laser welding, ultrasonic welding, and the like.

[0146] In some embodiments, the battery module 100 includes insulating glue, which is disposed between the electrode terminals 21 and the housing 10 to reduce the risk of short circuits.

[0147] In some embodiments, insulating glue is provided between the adapter and the housing 10 to further reduce the risk of short circuit.

[0148] Example 1

[0149] Referring to Figures 11 to 15 , in some embodiments, the first sealing member 30 includes a first sealing portion 31 , which is bonded to the housing 10 , thereby reducing material costs and process steps. Optionally, the first sealing portion 31 is bonded to the first sidewall 121 and seals the first through-hole 10a . Optionally, the first sealing portion 31 comprises a sealant.

[0150] In some embodiments, the height of the first sealing portion 31 protruding from the first sidewall 121 is smaller than the height of the electrical connector 100 a protruding from the first sidewall 121 , which facilitates the connection between the electrical connector 100 a and an external device.

[0151] In some embodiments, the thickness W1 of the first sealing portion 31 satisfies 0.02 mm ≤ W1 ≤ 1 mm, which helps to reduce the space occupied by the first sealing portion 31. W1 can be any one of 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0152] In some embodiments, the thickness W1 of the first sealing portion 31 satisfies 0.1 mm ≤ W1 ≤ 0.3 mm, which helps reduce the space occupied by the first sealing portion 31 and facilitates process production. W1 can be any one of 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.30 mm.

[0153] In some embodiments, the first sealing portion 31 is configured to provide a seal when the internal temperature of the battery module 100 has not reached the first temperature T1. When the internal temperature of the battery module 100 reaches the first temperature T1, the first sealing portion 31 becomes molten, allowing the receiving space 10c to communicate with the outside through the first through-hole 10a, thereby providing pressure relief. In this embodiment, the area of ​​the first through-hole 10a serves as the pressure relief area.

[0154] In some embodiments, the first through hole 10a is configured as a circle, and the diameter D1 of the first through hole 10a satisfies 0.5 mm ≤ D1 ≤ 5.5 mm. D1 can be any one of 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4.1 mm, 4.3 mm, 4.5 mm, 4.7 mm, 4.9 mm, 5.1 mm, 5.3 mm, and 5.5 mm.

[0155] In other embodiments, the first through hole 10a may be configured in other structures, such as a triangle, a rectangle, an ellipse, etc.

[0156] In some embodiments, the material of the first sealing portion 31 includes any one of polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE). In other embodiments, the material of the first sealing portion 31 can also be other materials, as long as it can meet the requirements of sealing the first through hole 10a and achieving pressure relief when the internal temperature of the battery module 100 reaches the first temperature T1.

[0157] Referring to FIG. 15 , in some embodiments, the first sealing portion 31 includes a first supporting layer 311 and a first adhesive layer 312 , and the first adhesive layer 312 adhesively connects the first supporting layer 311 and the housing 10 .

[0158] In some embodiments, the second sealing member 40 includes a second sealing portion 41, which is bonded to the housing 10, thereby reducing material costs and process steps. Optionally, the second sealing portion 41 is bonded to the first sidewall 121 and seals the second through hole 10b. Optionally, the second sealing portion 41 includes a sealant.

[0159] In some embodiments, the height of the second sealing portion 41 protruding from the first side wall 121 is smaller than the height of the electrical connector 100 a protruding from the first side wall 121 , which facilitates the connection between the electrical connector 100 a and an external device.

[0160] In some embodiments, the thickness W2 of the second sealing portion 41 satisfies 0.02 mm ≤ W2 ≤ 1 mm, which helps to reduce the space occupied by the second sealing portion 41. W2 can be any one of 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0161] In some embodiments, the thickness W2 of the second sealing portion 41 satisfies 0.1 mm ≤ W2 ≤ 0.3 mm, which helps reduce the space occupied by the second sealing portion 41 and facilitates process production. W2 can be any one of 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.30 mm.

[0162] In some embodiments, the second sealing portion 41 is configured to provide a seal when the internal temperature of the battery module 100 has not reached the second temperature T2. When the internal temperature of the battery module 100 reaches the second temperature T2, the second sealing portion 41 becomes molten, allowing the receiving space 10c to communicate with the outside through the second through-hole 10b, thereby providing pressure relief. In this embodiment, the area of ​​the second through-hole 10b serves as the pressure relief area.

[0163] In some embodiments, along the first direction X, the projected area of ​​the second through hole 10 b is greater than or equal to the projected area of ​​the first through hole 10 a , which can increase the pressure relief rate and facilitate pressure relief.

[0164] In some embodiments, the second through hole 10b is configured as a circle, and the diameter D2 of the second through hole 10b satisfies 0.5 mm ≤ D2 ≤ 5.5 mm. D2 can be any one of 0.5 mm, 0.7 mm, 0.9 mm, 1.1 mm, 1.3 mm, 1.5 mm, 1.7 mm, 1.9 mm, 2.1 mm, 2.3 mm, 2.5 mm, 2.7 mm, 2.9 mm, 3.1 mm, 3.3 mm, 3.5 mm, 3.7 mm, 3.9 mm, 4.1 mm, 4.3 mm, 4.5 mm, 4.7 mm, 4.9 mm, 5.1 mm, 5.3 mm, and 5.5 mm.

[0165] In other embodiments, the second through hole 10b may be configured in other structures, such as a triangle, a rectangle, an ellipse, etc.

[0166] In some embodiments, the material of the second sealing portion 41 includes any one of polypropylene (PP), polyethylene (PE), polyvinylidene fluoride (PVDF), and polytetrafluoroethylene (PTFE). In other embodiments, the material of the second sealing portion 41 can also be other materials, as long as it can meet the requirements of sealing the second through hole 10b and achieving pressure relief when the internal temperature of the battery module 100 reaches the second temperature T2.

[0167] In some embodiments, the structure of the second sealing portion 41 is the same as that of the first sealing portion 31 described above, and is not described herein in detail.

[0168] Example 2

[0169] Referring to Figures 6 to 10, in some embodiments, the first sealing member 30 includes a first sealing portion 31 and a first connecting portion 32. The first connecting portion 32 is adhesively connected to the first sealing portion 31, and the first sealing portion 31 is adhesively connected to the housing 10. Optionally, the first sealing portion 31 is adhesively bonded to the first side wall 121 and closes the first through hole 10a. Optionally, the first sealing portion 31 includes a sealant. Along the first direction X, the projection of the first connecting portion 32 overlaps with the projection of the first sealing portion 31. By providing the first connecting portion 32, it is possible to reduce the penetration of water and water vapor from the first sealing portion 31 into the receiving space 10c, thereby reducing the risk of short circuit.

[0170] In some embodiments, along the first direction X, the projection of the first connecting portion 32 overlaps with the projection of the first sealing portion 31 , which can further reduce water and water vapor from penetrating into the receiving space 10 c from the first sealing portion 31 and further reduce the risk of short circuit.

[0171] In some embodiments, along the first direction X, the projection of the first connecting portion 32 is located within the projection of the first sealing portion 31, and the projection of the first through hole 10a is located within the projection of the first connecting portion 32. Specifically, when installing the first sealing member 30, by pressing, the first sealing portion 31 overflows the edge of the first connecting portion 32, which helps the first sealing portion 31 fill the gap between the housing 10 and the first connecting portion 32, reducing the infiltration of water and water vapor into the receiving space 10c through the gap. The first connecting portion 32 can also reduce the infiltration of water and water vapor, further reducing the risk of short circuits.

[0172] In some embodiments, the first sealing portion 31 is configured to seal the battery module 100 until the internal temperature reaches the first temperature T1. When the internal temperature reaches the first temperature T1, the battery module 100 melts, allowing the receiving space 10c to communicate with the outside through the first through-hole 10a, thereby relieving pressure.

[0173] In some embodiments, the first sealing portion 31 includes a first supporting layer 311, a first adhesive layer 312, and a second adhesive layer 313. The first adhesive layer 312 and the second adhesive layer 313 are adhesively connected to opposite sides of the first supporting layer 311. The first adhesive layer 312 is adhesively connected to the first sidewall 121, and the second adhesive layer is adhesively connected to the first connecting portion 32.

[0174] In some embodiments, the first sealing portion 31 is provided with a first sealing portion opening 31a, and the first sealing portion opening 31a passes through the first supporting layer 311, the first adhesive layer 312 and the second adhesive layer 313. The first sealing portion opening 31a is connected to the first through hole 10a. Along the first direction X, the projection of the first sealing portion opening 31a overlaps with the projection of the first through hole 10a. Optionally, the projection of the first through hole 10a is located within the projection of the first sealing portion opening 31a. Optionally, the projection of the first sealing portion opening 31a overlaps with the projection of the first through hole 10a. By providing the first sealing portion opening 31a, faster pressure relief is facilitated, the risk of clogging the first through hole 10a after the first sealing portion 31 melts is reduced, and material costs are reduced.

[0175] In some embodiments, the height of the first sealing portion 31 and the first connecting portion 32 protruding from the first sidewall 121 is smaller than the height of the electrical connector 100a protruding from the first sidewall 121, which facilitates connection between the electrical connector 100a and external devices.

[0176] In some embodiments, the thickness W1 of the first sealing portion 31 satisfies 0.02 mm ≤ W1 ≤ 1 mm, which helps to reduce the space occupied by the first sealing portion 31. W1 can be any one of 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0177] In some embodiments, the thickness W1 of the first sealing portion 31 satisfies 0.1 mm ≤ W1 ≤ 0.3 mm, which helps reduce the space occupied by the first sealing portion 31 and facilitates process production. W1 can be any one of 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.30 mm.

[0178] In some embodiments, the thickness h1 of the first connecting portion 32 satisfies 0.03 mm ≤ h1 ≤ 1.00 mm, which helps reduce the space occupied by the first connecting portion 32. h1 can be any one of 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0179] In some embodiments, the thickness h1 of the first connecting portion 32 satisfies 0.05 mm ≤ h1 ≤ 0.15 mm. This reduces the space occupied by the first connecting portion 32 while ensuring water seepage resistance and facilitates production. h1 can be any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0180] In some embodiments, the first connection portion 32 includes at least one metal material selected from aluminum, nickel, and stainless steel. In other embodiments, the first connection portion 32 may also include other metal materials, such as at least one selected from copper, iron, tin, platinum, zinc, titanium, tungsten, and lead.

[0181] In some embodiments, the first connection portion 32 is configured as a circle. In other embodiments, the first connection portion 32 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0182] In some embodiments, the second sealing member 40 includes a second sealing portion 41 and a second connecting portion 42. The second connecting portion 42 is adhesively connected to the second sealing portion 41, and the second sealing portion 41 is adhesively connected to the housing 10. Optionally, the second sealing portion 41 is adhesively bonded to the first sidewall 121 and seals the second through hole 10b. Optionally, the second sealing portion 41 includes a sealant. Along the first direction X, the projection of the second connecting portion 42 overlaps with the projection of the second sealing portion 41. By providing the second connecting portion 42, the infiltration of water and water vapor from the second sealing portion 41 into the receiving space 10c can be reduced, thereby reducing the risk of short circuits.

[0183] In some embodiments, along the first direction X, the projection of the second connection portion 42 overlaps with the projection of the second sealing portion 41 , which can further reduce water and water vapor from penetrating into the receiving space 10 c from the second sealing portion 41 and further reduce the risk of short circuit.

[0184] In some embodiments, along the first direction X, the projection of the second connecting portion 42 is located within the projection of the second sealing portion 41, and the projection of the second through hole 10b is located within the projection of the second connecting portion 42. Specifically, when installing the second sealing member 40, by pressing, the second sealing portion 41 overflows the edge of the second connecting portion 42. This helps the second sealing portion 41 fill the gap between the housing 10 and the second connecting portion 42, reducing the infiltration of water and water vapor into the receiving space 10c through the gap. The second connecting portion 42 can also reduce the infiltration of water and water vapor, further reducing the risk of short circuits.

[0185] In some embodiments, the second sealing portion 41 is configured to seal the battery module 100 until the internal temperature reaches the second temperature T2. When the internal temperature reaches the second temperature T2, the second sealing portion 41 melts, allowing the receiving space 10c to communicate with the outside through the second through-hole 10b, thereby relieving pressure.

[0186] In some embodiments, the structure of the second sealing portion 41 is the same as that of the first sealing portion 31 in the above embodiment, and is not described herein in detail.

[0187] In some embodiments, the second sealing portion 41 is provided with a second sealing portion opening 41a. The first sealing portion opening 31a is connected to the second through hole 10b. Along the first direction X, the projection of the second sealing portion opening 41a overlaps with the projection of the second through hole 10b. Optionally, the projection of the second through hole 10b is located within the projection of the second sealing portion opening 41a. Optionally, the projection of the second sealing portion opening 41a overlaps with the projection of the second through hole 10b. By providing the second sealing portion opening 41a, faster pressure relief is facilitated, the risk of clogging the second through hole 10b after the second sealing portion 41 melts is reduced, and material costs are reduced.

[0188] In some embodiments, the height of the second sealing portion 41 and the second connecting portion 42 protruding from the first side wall 121 is less than the height of the electrical connector 100a protruding from the first side wall 121, which facilitates the connection between the electrical connector 100a and external devices.

[0189] In some embodiments, the thickness W2 of the second sealing portion 41 satisfies 0.02 mm ≤ W2 ≤ 1 mm, which helps to reduce the space occupied by the second sealing portion 41. W2 can be any one of 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0190] In some embodiments, the thickness W2 of the second sealing portion 41 satisfies 0.1 mm ≤ W2 ≤ 0.3 mm, which helps reduce the space occupied by the second sealing portion 41 and facilitates process production. W2 can be any one of 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.17 mm, 0.18 mm, 0.19 mm, 0.20 mm, 0.21 mm, 0.22 mm, 0.23 mm, 0.24 mm, 0.25 mm, 0.26 mm, 0.27 mm, 0.28 mm, 0.29 mm, and 0.30 mm.

[0191] In some embodiments, the thickness h2 of the second connecting portion 42 satisfies 0.03 mm ≤ h2 ≤ 1.00 mm, which helps reduce the space occupied by the second connecting portion 42. h2 can be any one of 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0192] In some embodiments, the thickness h2 of the second connecting portion 42 satisfies 0.05 mm ≤ h2 ≤ 0.15 mm. This reduces the space occupied by the second connecting portion 42 while ensuring water seepage resistance and facilitates production. h2 can be any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0193] In some embodiments, the second connection portion 42 includes at least one metal material selected from aluminum, nickel, and stainless steel. In other embodiments, the second connection portion 42 may also include other metal materials, such as at least one selected from copper, iron, tin, platinum, zinc, titanium, tungsten, and lead.

[0194] In some embodiments, the second connection portion 42 is configured as a circle. In other embodiments, the second connection portion 42 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0195] Example 3

[0196] Referring to Figures 1 to 5 , in some embodiments, the first sealing member 30 includes a first sealing portion 31, a first connecting portion 32, and a first fixing portion 33. The first sealing portion 31 is connected to the first connecting portion 32 and the first fixing portion 33 on either side. The first fixing portion 33 is connected to the housing 10 and defines a first opening 331. The first opening 331 extends through the first fixing portion 33 and communicates with the first through-hole 10a. The first fixing portion 33 enhances the connection strength between the first sealing member 30 and the housing 10, reducing the risk of air leakage.

[0197] In some embodiments, the first sealing portion 31 in Example 3 is the same as the first sealing portion 31 in Example 2, and is not described again herein.

[0198] In some embodiments, the first sealing portion opening 31 a is connected to the first opening 331 , and the air pressure in the battery module 100 is discharged through the first through hole 10 a , the first opening 331 and the first pressure relief channel, which is beneficial to pressure relief.

[0199] In some embodiments, along the first direction X, the projection of the first opening 331 is located within the projection of the first sealing portion opening 31 a , which further facilitates pressure relief and reduces the risk of the melted first sealing portion 31 blocking the first opening 331 .

[0200] In some embodiments, the first connection portion 32 in embodiment 3 is the same as the first connection portion 32 in embodiment 2, and is not described again herein.

[0201] In some embodiments, the first fixing portion 33 is configured as a circle. In other embodiments, the first connecting portion 32 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0202] In some embodiments, the outer diameter D3 of the first fixing portion 33 satisfies 1 mm ≤ D3 ≤ 6 mm, and D3 is greater than or equal to the outer diameter D1 of the first through hole 10 a, facilitating connection of the first fixing portion 33 to the first sidewall. D3 can be any one of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm.

[0203] In some embodiments, the outer diameter D3 of the first fixing portion 33 satisfies 2 mm ≤ D3 ≤ 5 mm, which facilitates the connection of the first fixing portion 33 to the first side wall and helps reduce the occupied space. D3 can be any one of 2 mm, 3 mm, 4 mm, and 5 mm.

[0204] Optionally, when the outer diameter of the first fixing portion 33 is greater than the outer diameter of the first through hole 10a, the first fixing portion 33 is fixedly connected to the first side wall 121 by welding.

[0205] Optionally, when the outer diameter of the first fixing portion 33 is equal to the outer diameter of the first through hole 10 a , the first fixing portion 33 is disposed in the first through hole 10 a by welding, which can further reduce the space occupied by the first fixing portion 33 .

[0206] In some embodiments, the projection of the first opening 331 is located within the projection of the first through hole 10a along the first direction X, which can reduce the intrusion of water and water vapor into the receiving space 10c. In embodiment 3, the area of ​​the first opening 331 is the pressure relief area.

[0207] In some embodiments, the area S1 of the first opening 331 satisfies 0.008 mm 2 ≤S1≤16mm 2 . S1 can be 0.008mm 2 , 0.009mm 2 , 0.010mm 2 , 0.011mm 2 ...15.998mm 2 , 15.999mm 2 , 16mm 2 Any one of .

[0208] In some embodiments, the battery module 100 includes an electrolyte (not shown), which is disposed within the receiving space 10c and infiltrates at least a portion of the battery cells 20. When the temperature of the battery module 100 reaches a first temperature T1, the SEI film decomposes, and a side reaction occurs between the battery cells 20 and the electrolyte. This results in a lower gas production rate for the battery cells 20. Assuming the pressure relief rate corresponding to the pressure relief area S1 is not less than the gas production rate, a smaller pressure relief area S1 reduces the amount of external moisture and oxygen that enters the battery module 100, thereby reducing the risk of accelerated side reactions and combustion in the battery cells.

[0209] In some embodiments, the first opening 331 is configured as a circle, and the diameter of the first opening 331 is smaller than the diameter of the first through hole 10a. In other embodiments, the first opening 331 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0210] In some embodiments, the outer diameter of the first fixing portion 33 is greater than or equal to the outer diameter of the first connecting portion 32 , and the outer diameter of the first connecting portion 32 is greater than the diameter of the first opening 331 , which helps to reduce the penetration of water and water vapor into the receiving space 10 c and reduce the risk of short circuit.

[0211] In some embodiments, the diameter d1 of the first opening 331 satisfies 0.1 mm ≤ d1 ≤ 4 mm. d1 can be any one of 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, ..., 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, and 4 mm.

[0212] In some embodiments, the diameter d1 of the first opening 331 satisfies 0.3 mm ≤ d1 ≤ 3 mm, further reducing the intrusion of water and water vapor into the receiving space 10 c. d1 can be any one of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, ..., 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm.

[0213] In some embodiments, when the first opening 331 is in other shapes, the side length of the first opening 331 satisfies the range of d1. For example, if the first opening 331 is a square, the side length L1 of the first opening 331 satisfies 0.1 mm ≤ L1 ≤ 4 mm.

[0214] In some embodiments, the thickness h3 of the first fixing portion 33 satisfies 0.03 mm ≤ h3 ≤ 1.00 mm, which helps reduce the space occupied by the first fixing portion 33. h3 can be any one of 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0215] In some embodiments, the thickness h3 of the first fixing portion 33 satisfies 0.05 mm ≤ h3 ≤ 0.15 mm, which helps reduce the space occupied by the first fixing portion 33 and facilitates welding. h3 can be any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0216] In some embodiments, the first fixing portion 33 includes at least one metal material selected from aluminum, nickel, and stainless steel. In other embodiments, the first fixing portion 33 may also include other metal materials, such as at least one selected from copper, iron, tin, platinum, zinc, titanium, tungsten, and lead.

[0217] In some embodiments, the second sealing member 40 includes a second sealing portion 41, a second connecting portion 42, and a second fixing portion 43. The second sealing portion 41 is connected to the second connecting portion 42 and the second fixing portion 43 on both sides. The second fixing portion 43 is connected to the housing 10. The second fixing portion 43 has a second opening 431 extending through the second fixing portion 43 and communicating with the second through hole 10b. The second fixing portion 43 can enhance the connection strength between the second sealing member 40 and the housing 10, reducing the risk of air leakage.

[0218] In some embodiments, the second sealing portion 41 in Example 3 is the same as the second sealing portion 41 in Example 2, and is not described again herein.

[0219] In some embodiments, the second sealing portion opening 41 a is connected to the second opening 431 , and the air pressure in the battery module 100 is discharged through the second through hole 10 b , the second opening 431 and the second pressure relief channel, which is beneficial to pressure relief.

[0220] In some embodiments, along the first direction X, the projection of the second opening 431 is located within the projection of the second sealing portion opening 41 a , which further facilitates pressure relief and reduces the risk of the melted second sealing portion 41 blocking the second opening 431 .

[0221] In some embodiments, the second connection portion 42 in embodiment 3 is the same as the second connection portion 42 in embodiment 2, and is not described again herein.

[0222] In some embodiments, the second fixing portion 43 is configured as a circle. In other embodiments, the second connecting portion 42 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0223] In some embodiments, the outer diameter D4 of the second fixing portion 43 satisfies 1 mm ≤ D4 ≤ 6 mm, and D4 is greater than or equal to the outer diameter D2 of the second through hole 10 b, facilitating connection of the second fixing portion 43 to the first sidewall. D4 can be any one of 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, and 6 mm.

[0224] In some embodiments, the outer diameter D4 of the second fixing portion 43 satisfies 2mm≤D4≤5mm, which facilitates the connection of the second fixing portion 43 to the first side wall and helps reduce the occupied space. D4 can be any one of 2mm, 3mm, 4mm, and 5mm.

[0225] Optionally, when the outer diameter of the second fixing portion 43 is greater than the outer diameter of the second through hole 10b, the second fixing portion 43 is fixedly connected to the first side wall 121 by welding.

[0226] Optionally, when the outer diameter of the second fixing portion 43 is equal to the outer diameter of the second through hole 10 b , the second fixing portion 43 is disposed in the second through hole 10 b by welding, which can further reduce the space occupied by the second fixing portion 43 .

[0227] In some embodiments, the projection of the second opening 431 is located within the projection of the second through hole 10b along the first direction X, which can reduce the intrusion of water and water vapor into the receiving space 10c. In embodiment 3, the area of ​​the second opening 431 is a pressure relief area.

[0228] In some embodiments, the area of ​​the second opening 431 is larger than the area of ​​the first opening 331, which increases the pressure relief area and is beneficial to pressure relief. The area S2 of the second opening 431 meets the requirement of 0.07mm 2 ≤S2≤25mm 2 . S2 can be 0.07mm 2 , 0.08mm 2 , 0.09mm 2 , 0.01mm 2 , 0.11mm 2 ...24.998mm 2 , 24.999mm 2 , 25mm 2 Any one of .

[0229] In some embodiments, when the temperature of the battery module 100 reaches the second temperature T2, the isolation membrane melts, the positive electrode and the negative electrode are short-circuited, the negative electrode and the electrolyte continue to have side reactions, the gas production rate of the battery cell 20 is high, and the gas production rate is greater than the pressure relief rate of the first pressure relief channel. The second pressure relief channel melts and opens, increasing the pressure relief area. On the basis that the pressure relief rate corresponding to the pressure relief area S2 is not less than the gas production rate, the larger the pressure relief area S2 at this time, the higher the pressure relief rate, the faster the pressure relief, the more gas and heat can be discharged, and the risk of short circuit between the battery cell 20 and the outer shell 10 caused by further deformation of the outer shell 10 is reduced.

[0230] In some embodiments, the second opening 431 is configured as a circle, and the diameter of the second opening 431 is smaller than the diameter of the second through hole 10b. In other embodiments, the second opening 431 can also be configured as other shapes, such as an ellipse, a rectangle, etc.

[0231] In some embodiments, the outer diameter of the second fixing portion 43 is greater than or equal to the outer diameter of the second connecting portion 42 , and the outer diameter of the second connecting portion 42 is greater than the diameter of the second opening 431 , which helps to reduce water and water vapor from penetrating into the receiving space 10 c and reduce the risk of short circuit.

[0232] In some embodiments, the diameter d2 of the second opening 431 satisfies 0.3 mm ≤ d2 ≤ 5 mm. d2 can be any one of 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, ..., 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm, and 5 mm.

[0233] In some embodiments, the diameter d2 of the second opening 431 satisfies 0.5 mm ≤ d2 ≤ 3 mm, further reducing the intrusion of water and water vapor into the receiving space 10 c. d2 can be any one of 0.5 mm, 0.6 mm, 0.7 mm, ..., 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, and 3 mm.

[0234] In some embodiments, when the second opening 431 is in other shapes, the side length of the second opening 431 satisfies the range d2. For example, if the second opening 431 is a square, the side length L2 of the second opening 431 satisfies 0.3 mm ≤ L2 ≤ 5 mm.

[0235] In some embodiments, the thickness h4 of the second fixing portion 43 satisfies 0.03 mm ≤ h4 ≤ 1.00 mm, which helps reduce the space occupied by the second fixing portion 43. h4 can be any one of 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, ..., 0.91 mm, 0.92 mm, 0.93 mm, 0.94 mm, 0.95 mm, 0.96 mm, 0.97 mm, 0.98 mm, 0.99 mm, and 1.0 mm.

[0236] In some embodiments, the thickness h4 of the second fixing portion 43 satisfies 0.05 mm ≤ h4 ≤ 0.15 mm, which helps reduce the space occupied by the second fixing portion 43 and facilitates welding. h4 can be any one of 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.10 mm, 0.11 mm, 0.12 mm, 0.13 mm, 0.14 mm, and 0.15 mm.

[0237] In some embodiments, the second fixing portion 43 includes at least one metal material selected from aluminum, nickel, and stainless steel. In other embodiments, the second fixing portion 43 may also include other metal materials, such as at least one selected from copper, iron, tin, platinum, zinc, titanium, tungsten, and lead.

[0238] In some embodiments, the first sealing member 30 and the second sealing member 40 can be combined in different structures. For example, the first sealing member 30 adopts the structure in Example 2, and the second sealing member 40 adopts the structure in Example 3.

[0239] Referring to FIG. 17 , the present application further provides a sealing member 101 for sealing the housing 10 of the battery module 100. The sealing member 101 includes a sealing portion 101a and a connecting portion 101b. The connecting portion 101b is bonded to the sealing portion 101a. The sealing portion 101a is a sealant. The sealing portion 101a is configured to lose adhesion and / or melt when the temperature reaches a third temperature.

[0240] In some embodiments, the seal 101 includes a fixing portion 101c, which is used to connect to the outer shell 10 of the battery module 100. The sealing portion 101a is connected to the fixing portion 101c. The fixing portion 101c is provided with an opening 101d, which is connected to the interior of the outer shell 10.

[0241] In some embodiments, the third temperature is 95°C to 125°C or 115°C to 145°C.

[0242] In some embodiments, the shape of the sealing member 101 includes any one of a racetrack shape, an ellipse, a rectangle, a circle, and a ring to adapt to the thickness of the housing 10 .

[0243] In some embodiments, the sealing portion 101 a is the same as the first sealing portion 31 in any of the above embodiments.

[0244] In some embodiments, the sealing portion 101 a is the same as the second sealing member 41 in any of the above embodiments.

[0245] In some embodiments, the connecting portion 101 b is the same as the first connecting portion 32 in any of the above embodiments.

[0246] In some embodiments, the connecting portion 101 b is the same as the second connecting portion 42 in any of the above embodiments.

[0247] In some embodiments, the fixing portion 101 c is the same as the first fixing portion 33 in any of the above embodiments.

[0248] In some embodiments, the fixing portion 101 c is the same as the second fixing portion 43 in any of the above embodiments.

[0249] 18 , the present application also provides an electrical device 200 using the battery module 100. In one embodiment, the electrical device 200 of the present application may be, but is not limited to, electronic equipment, drones, backup power supplies, electric vehicles, electric motorcycles, electric power-assisted bicycles, power tools, large household batteries, and the like.

[0250] Those skilled in the art should recognize that the above embodiments are merely intended to illustrate the present application and are not intended to limit the present application. As long as they are within the spirit of the present application, appropriate changes and modifications to the above embodiments fall within the scope disclosed in the present application.

Claims

1. A battery module, characterized in that: include: A shell, wherein the shell is provided with a first through hole, a second through hole and a receiving space, the first through hole is connected to the receiving space, and the second through hole is connected to the receiving space; A battery cell, wherein the battery cell is arranged in the receiving space; a first sealing member connected to the housing and sealing the first through hole; a second sealing member connected to the housing and sealing the second through hole; The first seal is configured to melt and / or debond to form a first pressure relief channel when the internal temperature of the battery module reaches a first temperature, and the second seal is configured to melt and / or debond to form a second pressure relief channel when the internal temperature of the battery module reaches a second temperature, and the second temperature is greater than the first temperature.

2. The battery module according to claim 1, characterized in that: The shell includes a bottom wall and a side wall, the side wall is connected to the bottom wall, the first seal and the side wall are arranged along a first direction, the first through hole passes through the side wall, the second through hole passes through the side wall, and the first direction is the length direction or width direction of the battery module.

3. The battery module according to claim 2, characterized in that: The side wall includes a first side wall, the battery module includes an electrical connector, the electrical connector is connected to the battery cell and extends from the first side wall, and a first space is defined between the first side wall and the battery cell; The first through hole passes through the first side wall, and the second through hole passes through the first side wall.

4. The battery module according to claim 2, characterized in that: The side wall includes a first side wall and a second side wall, the battery module includes an electrical connector, the electrical connector connects the battery cell and extends from the first side wall, the first side wall and the second side wall are arranged along a first direction, the first through hole penetrates the second side wall, and the second through hole penetrates the second side wall.

5. The battery module according to claim 1, characterized in that: The first sealing member includes a first sealing portion, and the first sealing portion is bonded to the housing.

6. The battery module according to claim 1, characterized in that: The first sealing member includes a first sealing portion and a first connecting portion, the first connecting portion is bonded to the first sealing portion, and the first sealing portion is bonded to the housing.

7. The battery module according to claim 1, characterized in that: The first sealing member includes a first connecting portion, a first sealing portion and a first fixing portion, the first connecting portion and the first fixing portion are connected at two sides of the first sealing portion, the first fixing portion is connected to the housing, the first fixing portion is provided with a first opening, and the first opening is connected to the first through hole.

8. The battery module according to claim 7, characterized in that: The area S1 of the first opening satisfies 0.008 mm 2 ≤S1≤16mm 2 .

9. The battery module according to claim 7, characterized in that: The first sealing portion includes a first adhesive layer, a first supporting layer, and a second adhesive layer. The first adhesive layer adhesively connects the first connecting portion and the first supporting layer. The second adhesive layer adhesively connects the first fixing portion and the first supporting layer.

10. The battery module according to claim 7, characterized in that: The first connecting portion and the first fixing portion include at least one metal material selected from the group consisting of aluminum, nickel and stainless steel.

11. The battery module according to claim 8, characterized in that: The thickness h1 of the first connecting portion satisfies 0.03 mm ≤ h1 ≤ 1.00 mm.

12. The battery module according to claim 8, characterized in that: The first sealing portion is provided with a first sealing portion opening, and the first sealing portion opening is communicated with the first opening.

13. The battery module according to claim 1, characterized in that: The second sealing member includes a second sealing portion, and the second sealing portion is bonded to the housing.

14. The battery module according to claim 1, characterized in that: The second sealing member includes a second sealing portion and a second connecting portion, the second connecting portion is bonded to the second sealing portion, and the second sealing portion is bonded to the housing.

15. The battery module according to claim 7, characterized in that: The second sealing member includes a second connecting portion, a second sealing portion and a second fixing portion, the second sealing portion has two sides connected to the second connecting portion and the second fixing portion, the second fixing portion is connected to the housing, the second fixing portion is provided with a second opening, and the second opening is connected to the second through hole.

16. The battery module according to claim 15, characterized in that: An area of ​​the second opening is greater than an area of ​​the first opening.

17. The battery module according to claim 15, characterized in that: The area S2 of the second opening satisfies 0.07mm 2 ≤S2≤25mm 2 .

18. The battery module according to claim 7, characterized in that: The diameter d1 of the first opening satisfies 0.1 mm≤d1≤4 mm.

19. The battery module according to claim 15, characterized in that: The diameter d2 of the second opening satisfies 0.3 mm≤d2≤5 mm.

20. The battery module according to claim 2, characterized in that: Along the first direction, a projection area of ​​the second through hole is greater than or equal to a projection area of ​​the first through hole.

21. The battery module according to claim 20, characterized in that: The diameter D1 of the first through hole satisfies 0.5 mm≤D1≤5.5 mm.

22. The battery module according to claim 20, characterized in that: A diameter D2 of the second through hole satisfies 0.5 mm≤D2≤5.5 mm.

23. The battery module according to claim 1, characterized in that: The first temperature T1 satisfies 95°C≤T1≤125°C.

24. The battery module according to claim 23, characterized in that: The first temperature T1 satisfies 105°C≤T1≤120°C.

25. The battery module according to claim 1, characterized in that: The second temperature T2 satisfies 115°C≤T2≤145°C.

26. The battery module according to claim 25, characterized in that: The second temperature T2 satisfies 120°C≤T2≤135°C.

27. The battery module according to claim 1, characterized in that: The shell is provided with a first recessed portion which is recessed from the outer surface of the shell toward the inner surface of the shell, the first through hole penetrates a part of the bottom surface of the first recessed portion, the first sealing member is provided in the first recessed portion, and the first sealing member does not protrude from the surface of the shell.

28. The battery module according to claim 1, characterized in that: The shell is provided with a second recessed portion which is recessed from the outer surface of the shell toward the inner surface of the shell, the second through hole penetrates a part of the bottom surface of the second recessed portion, the second sealing member is provided in the second recessed portion, and the second sealing member does not protrude from the surface of the shell.

29. The battery module according to claim 3, characterized in that: The height of the first sealing member protruding from the first side wall is smaller than the height of the electrical connector protruding from the first side wall, and the height of the second sealing member protruding from the first side wall is smaller than the height of the electrical connector protruding from the first side wall.

30. The battery module according to claim 15, characterized in that: The second connecting portion and the second fixing portion include at least one metal material selected from the group consisting of aluminum, nickel, and stainless steel.

31. An electrical equipment, characterized in that: A battery module comprising any one of claims 1 to 30.

32. A seal for sealing a battery module housing, characterized in that: The sealing member comprises: A sealing part and a connecting part, wherein the connecting part is bonded to the sealing part, the sealing part is a sealant, and the sealing part is configured to lose adhesion and / or melt when the temperature reaches a third temperature.

33. The seal according to claim 32, characterized in that The sealing member further comprises a fixing portion, which is arranged on a side of the sealing portion away from the connecting portion, and the fixing portion is provided with an opening.

34. The seal according to claim 32, characterized in that The third temperature is 95°C to 125°C or 115°C to 145°C.

35. The seal according to claim 32, characterized in that The material of the sealing part includes any one of polypropylene, polyethylene, polyvinylidene fluoride and polytetrafluoroethylene.

36. The seal according to claim 33, characterized in that The connecting portion and the fixing portion include at least one metal material selected from the group consisting of aluminum, nickel and stainless steel.

37. The seal according to claim 32, characterized in that The shape of the sealing member includes any one of a racetrack shape, an ellipse, a rectangle, a circle, and a ring.

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