Battery monomer, battery pack and power utilization device

Abstract

The utility model discloses a battery monomer, a battery pack and a power utilization device, and relates to the technical field of batteries. The battery monomer has a first direction, the battery monomer comprises a shell, an electrode assembly, a top cover assembly, a pressure relief mechanism, an insulating part and a supporting part, the shell is provided with an accommodating cavity and a first wall, the first wall is positioned at one end of the shell along the first direction, one side, far away from the first wall, of the shell is also provided with an opening, and the opening is communicated with the accommodating cavity; the pressure relief mechanism is arranged on the first wall, at least part of the insulating part is arranged between the electrode assembly and the first wall, and a first weak part is arranged at the position, corresponding to the pressure relief mechanism, of the insulating part; the supporting piece is arranged between the first wall and the insulating piece, a second weak part is arranged on the supporting piece, and the first weak part and the second weak part are used for allowing gas to pass through the first weak part and the second weak part respectively and reach the pressure relief mechanism when the battery monomers are in thermal runaway. The battery monomer provided by the utility model is good in reliability and safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery pack and a power utilization device. BACKGROUND

[0002] New energy batteries are a kind of battery technology powered by new energy, which has a wide application prospect and important environmental protection significance. With the continuous progress of technology and the continuous growth of market demand, new energy batteries will become a more important technical means.

[0003] The current thermal-electric separation design is more and more common, and the thermal-electric separation design is to cancel the pressure relief part on the top cover and set the pressure relief part at the bottom of the shell. However, when the pressure relief part is set at the bottom of the shell, the bare battery cell will be tightly attached to the inner surface of the bottom of the shell due to its own weight, and the pressure relief part port will be blocked, which will easily lead to the failure of the battery cell to discharge high-temperature gas in time when the battery cell is in thermal runaway, and even explosion. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the present application provides a battery monomer, a battery pack and a power utilization device to solve one of the technical problems in the prior art.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0006] In a first aspect, the present application provides a battery monomer having a first direction, comprising:

[0007] a shell provided with a containing cavity, and the shell comprises a first wall, the first wall is located on one side of the shell along the first direction, and the side of the shell away from the first wall also has an opening, and the opening communicates with the containing cavity;

[0008] an electrode assembly arranged in the containing cavity;

[0009] a top cover assembly covering the opening;

[0010] a pressure relief mechanism arranged on the first wall, the pressure relief mechanism being used to open the pressure relief when the battery monomer is in thermal runaway;

[0011] an insulating part covering at least part of the electrode assembly, the insulating part being at least partially arranged between the electrode assembly and the first wall, and the insulating part being provided with a first weak part corresponding to the position of the pressure relief mechanism;

[0012] a support part arranged between the first wall and the insulating part, and the support part being provided with a second weak part;

[0013] The first and second weakened portions are configured to allow gas to pass through the first and second weakened portions, respectively, and reach the pressure relief mechanism when the battery cell is in thermal runaway.

[0014] In one of the embodiments of the first aspect, a projection of the second weakened portion on the first wall in the first direction at least partially falls on the pressure relief mechanism.

[0015] In one of the embodiments of the first aspect, the insulation member comprises two peripheral wall portions and a bottom wall portion, the two peripheral wall portions are respectively arranged on two sides of the bottom wall portion, the bottom wall portion covers a bottom surface of the electrode assembly, and corresponds to the first wall, the two peripheral wall portions are respectively wrapped around two opposite side surfaces of the electrode assembly, and the first weakened portion is arranged on the bottom wall portion.

[0016] In one of the embodiments of the first aspect, the bottom wall portion has an indentation groove, the bottom wall portion further has two opposite side surfaces in the first direction, the indentation groove is arranged on one of the side surfaces, and the indentation groove forms the first weakened portion.

[0017] In the first direction, a thickness of the indentation groove is less than a thickness of a portion of the bottom wall portion other than the first weakened portion.

[0018] In one of the embodiments of the first aspect, the bottom wall portion has a notched section, the bottom wall portion further has two opposite side surfaces in the first direction, the notched section is arranged on one of the side surfaces, and the notched section forms the first weakened portion.

[0019] The notched section comprises a plurality of grooves arranged at intervals, in the first direction, a thickness of the grooves is less than a thickness of a portion of the bottom wall portion other than the first weakened portion, and the plurality of grooves are arranged to form the notched section.

[0020] In one of the embodiments of the first aspect, the first weakened portion comprises a plurality of the indentation grooves, and the plurality of the indentation grooves are arranged in parallel with each other, arranged in a cross shape, or enclosed to form a closed loop shape.

[0021] In one of the embodiments of the first aspect, the first weakened portion comprises a plurality of the notched sections, and the plurality of the notched sections are arranged in parallel with each other, arranged in a cross shape, or enclosed to form a closed loop shape.

[0022] In one of the embodiments of the first aspect, the battery cell further has a second direction perpendicular to the first direction, the bottom wall portion extends towards the second direction, and the bottom wall portion is provided with a first through hole, the first through hole penetrates the bottom wall portion in the first direction, and the first through hole and the first weakened portion are arranged at intervals in the second direction.

[0023] In one of the embodiments of the first aspect, the first number of through holes is a plurality, and the first through holes are arranged on both sides of the first weak portion along the second direction.

[0024] In one of the embodiments of the first aspect, the support member has a protruding structure on the side facing the first wall, the protruding structure abuts against the first wall to define an exhaust space between the support member and the first wall; and / or

[0025] The support member is provided with at least one exhaust hole, the exhaust hole forms the second weak portion, the exhaust hole penetrates the support member along the first direction, and the projection of at least one exhaust hole on the first wall along the first direction at least partially falls on the pressure relief mechanism.

[0026] In one of the embodiments of the first aspect, the support member is provided with a second through hole, the projection of the second through hole on the bottom wall portion along the first direction at least partially overlaps the first through hole, and the second through hole penetrates the support member along the first direction.

[0027] In one of the embodiments of the first aspect, the first weak portion is arranged on the side of the bottom wall portion facing the first wall, and / or the first weak portion is arranged on the side of the bottom wall portion facing the electrode assembly.

[0028] In the second aspect, the embodiments of the present application further provide a battery pack comprising the battery cell in any of the above embodiments.

[0029] In the third aspect, the embodiments of the present application further provide a power utilization device comprising the battery pack in any of the above embodiments.

[0030] Compared with the prior art, the present application has the beneficial effects that: the present application provides a battery cell, which comprises a shell, an electrode assembly, a top cover assembly, a pressure relief mechanism, an insulating member and a support member. The shell is provided with a receiving cavity, and the shell comprises a first wall located on one side of the shell along a first direction. The side of the shell away from the first wall is also provided with an opening, and the opening communicates with the receiving cavity. The electrode assembly is arranged in the receiving cavity, and the top cover assembly covers the opening. The pressure relief mechanism is arranged on the first wall and is used to open the pressure relief when the battery cell is in thermal runaway. In this way, the electrode assembly is electrically connected and the thermal runaway eruption does not interfere with each other, thereby improving the reliability and safety of the battery cell.

[0031] The insulating piece covers at least part of the electrode assembly, the insulating piece is at least partially arranged between the electrode assembly and the first wall, and the insulating piece is provided with a first weak part corresponding to the position of the pressure relief mechanism. In this way, when the battery monomer is normally used, the insulating piece insulates the electrode assembly and the shell, and when the battery monomer is in thermal runaway, the gas generated in the electrode assembly tears the first weak part to relieve pressure;

[0032] The support piece is arranged between the first wall and the insulating piece, and the support piece is provided with a second weak part. The first weak part and the second weak part are used to allow the gas to pass through the first weak part and the second weak part, respectively, to reach the pressure relief mechanism when the battery monomer is in thermal runaway. The gas in thermal runaway of the battery monomer breaks through the first weak part and reaches the pressure relief mechanism through the second weak part, so that the battery monomer is smoothly relieved, and the reliability and safety of the battery monomer are improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0034] Figure 1 The structure of the battery monomer in some embodiments of the present application is shown;

[0035] Figure 2 The exploded structure of the right-side-up battery monomer in some embodiments of the present application is shown;

[0036] Figure 3 The exploded structure of the upside-down battery monomer in some embodiments of the present application is shown;

[0037] Figure 4 The unfolded structure of the insulating piece in some embodiments of the present application is shown;

[0038] Figure 5 The Figure 4 The cross-sectional structure of the indentation groove in the A-A direction is shown;

[0039] Figure 6 The perspective structure of the battery monomer in some embodiments of the present application is shown;

[0040] Figure 7 The structure of the first weak part in some embodiments of the present application is shown;

[0041] Figure 8 The structure of the first weak part in some embodiments of the present application is shown;

[0042] Figure 9 Fig. 3 shows a schematic view of a structure of a first weakened portion in some embodiments of the present application;

[0043] Figure 10 Fig. 4 shows a schematic view of a structure of a first weakened portion in some embodiments of the present application;

[0044] Figure 11 Fig. 5 shows a schematic view of a structure of a first weakened portion in some embodiments of the present application; Figure 4 Fig. 6 shows a schematic view of a structure of a notch segment at I in Fig. 5.

[0045] Main element symbol explanation: D1 - first direction; D2 - second direction; D3 - third direction; 100 - battery monomer;

[0046] 110 - shell; 111 - first wall; 113 - accommodation cavity; 114 - opening; 1111 - pressure relief hole;

[0047] 120 - pressure relief mechanism; 130 - electrode assembly; 140 - top cover assembly;

[0048] 150 - insulating piece; 151 - peripheral wall part; 1511 - first folding part; 1512 - second folding part; 1513 - third folding part; 1514 - fourth folding part; 1515 - fifth folding part; 1516 - sixth folding part; 152 - bottom wall part; 1521 - first weakened portion; 1522 - indentation slot; 1523 - first through hole; 1524 - notch segment; 15241 - groove;

[0049] 160 - support piece; 161 - second weakened portion; 1611 - exhaust hole; 162 - second through hole; 163 - third through hole; 164 - protruding structure; 170 - exhaust space. DETAILED DESCRIPTION

[0050] Embodiments of the present application are described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary and are for the purpose of explanation only, and are not to be understood as limiting the present application.

[0051] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0052] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0053] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0054] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0055] As Figures 1 to 3 The embodiments of the present application provide a battery monomer 100, which comprises a shell 110, an electrode assembly 130, a top cover assembly 140, a pressure relief mechanism 120, an insulating piece 150 and a support piece 160.

[0056] In the embodiment of the present application, the battery cell 100 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0057] The battery cell 100 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0058] In some embodiments, a receiving cavity 113 is defined in the housing 110 . The housing 110 has a first wall 111 , wherein the first wall 111 is located at one end of the housing 110 along the first direction D1 .

[0059] The housing 110 further has an opening 114, which is located on a side of the housing 110 away from the first wall 111 and communicates with the accommodating cavity 113. Figure 2 and Figure 3 As shown, the first wall 111 is located at the bottom of the electrode assembly 130 and the opening 114 is located at the top of the housing.

[0060] The top cover assembly 140 covers the opening 114 to form a sealed space for accommodating the electrode assembly 130 .

[0061] The housing 110 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), etc. The electrode assembly 130 is disposed in the accommodating cavity 113 , and the top cover assembly 140 is electrically connected to the top of the electrode assembly 130 .

[0062] The pressure relief mechanism 120 is disposed on the first wall 111 , and is used to release pressure when the battery cell 100 experiences thermal runaway.

[0063] In addition, the pressure relief mechanism 120 is disposed on the first wall 111 , which also achieves the purpose of preventing the electrical connection of the battery cell 100 and the thermal runaway eruption from interfering with each other, thereby improving the reliability and safety of the battery cell 100 .

[0064] The insulating member 150 covers at least a portion of the electrode assembly 130 , and specifically at least a portion of the insulating member 150 is disposed between the electrode assembly 130 and the first wall 111 , thereby forming an insulating separation between the electrode assembly 130 and the first wall 111 to prevent short circuits.

[0065] It can be understood that if the insulating member 150 is directly arranged between the first wall 111 and the electrode assembly 130, although the short circuit problem between the first wall 111 and the electrode assembly 130 can be solved, the insulating member 150 will block the gas from flowing to the pressure relief mechanism 120, making it impossible to relieve pressure when the battery cell 100 thermally runs away.

[0066] To solve the above problems, as shown in Figure 2 and Figure 3 a first weak portion 1521 is arranged at a position corresponding to the pressure relief mechanism 120. When the battery monomer 100 is normally used, the insulating member 150 insulates the electrode assembly 130 and the first wall 111; when the battery monomer 100 is in thermal runaway, the strength of the position where the first weak portion 1521 is arranged is relatively low, and the gas generated in the electrode assembly 130 tears the first weak portion 1521 to relieve pressure, thereby reducing the risk of explosion and fire of the battery monomer 100.

[0067] Thermal runaway of the battery monomer 100 refers to that the internal pressure or temperature of the battery monomer 100 reaches the detonation pressure.

[0068] As shown in Figure 6 , a support member 160 is also arranged between the first wall 111 and the insulating member 150 to separate the insulating member 150 and the pressure relief mechanism 120, and the support member 160 is also provided with a second weak portion 161. The gas when the battery monomer 100 is in thermal runaway tears the first weak portion 1521, and the first weak portion 1521 and the second weak portion 161 are used to allow the gas to pass through the first weak portion 1521 and the second weak portion 161 respectively when the battery monomer 100 is in thermal runaway, so that the battery monomer 100 is relieved smoothly, and the reliability and safety of the battery monomer 100 are improved.

[0069] In some embodiments, along the first direction D1, the orthographic projection of the second weak portion 161 on the first wall 111 at least partially falls on the position corresponding to the pressure relief mechanism 120. In this way, the first weak portion 1521 and the second weak portion 161 are arranged in the position corresponding to the pressure relief mechanism 120 in sequence. When the battery monomer 100 is in thermal runaway, the first weak portion 1521, the second weak portion 161 and the pressure relief mechanism 120 are sequentially communicated, so that the gas is quickly discharged to the outside, the flow distance of the gas is shortened, the pressure relief time is shortened, and the pressure relief efficiency is improved.

[0070] In some embodiments, as shown in Figure 4 , the insulating member 150 further comprises two peripheral wall portions 151 and a bottom wall portion 152.

[0071] The bottom wall portion 152 covers the bottom surface of the electrode assembly 130 and corresponds to the first wall 111.

[0072] The first weak portion 1521 is arranged on the bottom wall portion 152, so that the first weak portion 1521 corresponds to the position of the pressure relief mechanism 120.

[0073] The two peripheral wall portions 151 are arranged on both sides of the bottom wall portion 152, and the peripheral wall portion 151 at least wraps the opposite two side surfaces of the electrode assembly 130.

[0074] In the present embodiment, as shown in Figure 3 two peripheral wall portions 151 are wrapped around the four sides of the front, back, left and right of the electrode assembly 130, improving the safety of the battery cell 100. In other embodiments, the peripheral wall portions 151 are wrapped around the front and back two sides or the left and right two sides of the electrode assembly 130.

[0075] In the present embodiment, as shown in Figure 4 one of the peripheral wall portions 151 includes a first folding portion 1511, a third folding portion 1513 and a fourth folding portion 1514, and the other peripheral wall portion 151 includes a second folding portion 1512, a fifth folding portion 1515 and a sixth folding portion 1516.

[0076] When the insulating piece 150 is unfolded, the first folding portion 1511 and the second folding portion 1512 are spaced apart along the third direction D3 and are respectively connected to the edges of the bottom wall portion 152.

[0077] The third folding portion 1513 and the fourth folding portion 1514 are spaced apart along the second direction D2, and the third folding portion 1513 and the fourth folding portion 1514 are respectively connected to the edges of the first folding portion 1511.

[0078] The fifth folding portion 1515 and the sixth folding portion 1516 are spaced apart along the second direction D2, and the fifth folding portion 1515 and the sixth folding portion 1516 are respectively connected to the edges of the second folding portion 1512.

[0079] The shapes of the two peripheral wall portions 151 are the same, except that the third folding portion 1513 and the fourth folding portion 1514 are respectively provided with a missing corner on the side away from the first folding portion 1511. Such a design facilitates the uniform assembly method of the insulating piece 150, so that the third folding portion 1513 of the insulating piece 150 is outside the fifth folding portion 1515, and the fourth folding portion 1514 is outside the sixth folding portion 1516.

[0080] As shown in Figure 3 and Figure 4 When the insulating piece 150 is assembled, the electrode assembly 130 is accommodated in the insulating piece 150. The bottom wall portion 152 covers the bottom surface of the electrode assembly 130, the second folding portion 1512 covers the front side surface of the electrode assembly 130, the first folding portion 1511 covers the back side surface of the electrode assembly 130, the third folding portion 1513 and the fifth folding portion 1515 are stacked and cover the right side surface of the electrode assembly 130, and the fourth folding portion 1514 and the sixth folding portion 1516 are stacked and cover the left side surface of the electrode assembly 130.

[0081] It should be noted that the battery cell 100 has a first direction D1, a second direction D2 and a third direction D3, wherein the first direction D1 is the thickness direction of the bottom wall portion 152, the second direction D2 is the length direction of the bottom wall portion 152, and the third direction D3 is the width direction of the bottom wall portion 152, and the first direction D1, the second direction D2 and the third direction D3 are perpendicular to each other in pairs.

[0082] In some embodiments, as shown in Figure 4 and Figure 5 The bottom wall portion 152 has an indentation groove 1522.

[0083] The indentation groove 1522 refers to a concave trace formed by applying pressure to the surface of the material to deform the material.

[0084] The bottom wall portion 152 also has two opposite side surfaces in the first direction D1, and the indentation groove 1522 is arranged on one of the side surfaces, and the indentation groove 1522 forms a first weak portion 1521.

[0085] It should be understood that the thickness of the indentation groove 1522 is less than the thickness of the part of the bottom wall portion 152 except the first weak portion 1521, so that the structural strength of the bottom wall portion 152 at the indentation groove 1522 is lower than that of the part except the first weak portion 1521. When the battery cell 100 is in thermal runaway, the gas preferentially rushes through the indentation groove 1522, so that the gas discharges pressure through the first weak portion 1521, and also guides the gas.

[0086] The indentation groove 1522 is usually completed using tools such as indentation knives, rollers or stamping plates. The indentation groove 1522 continuously extends on the bottom wall portion 152, which can improve the processing efficiency of the indentation groove 1522, and also reduce the requirements for processing tools.

[0087] In some embodiments, the number of indentation grooves 1522 is at least one.

[0088] In some embodiments, the thickness of the indentation groove 1522 is T, which satisfies: 0.01mm≤T≤0.3mm. T represents the residual thickness of the bottom wall portion 152 at the indentation groove 1522, and when there are multiple indentation grooves 1522, the thicknesses of the multiple indentation grooves 1522 can be the same or different.

[0089] In the embodiment, the plurality of indentation grooves 1522 have the same thickness. The thickness of the indentation groove 1522 can be T = 0.01 mm, 0.05 mm, 0.1 mm, 0.45 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc. When T < 0.01 mm, the bottom wall part 152 of the insulating part 150 is prone to tearing and breaking during the process, reducing the product yield. When T > 0.3 mm, the bottom wall part 152 of the insulating part 150 is not easy to tear at the weak part 1521 under internal pressure impact, and cannot timely release pressure.

[0090] In some embodiments, as shown in Figure 4 and Figure 11 , the bottom wall part 152 has a notch section 1524.

[0091] The notch section 1524 is formed by a toothed cutter. It can be understood that the toothed cutter has a sawtooth-shaped blade. When the toothed cutter presses the surface of the material, the surface of the material leaves a notch section 1524 composed of a plurality of grooves 15241.

[0092] In some embodiments, the number of notch sections 1524 is at least one.

[0093] The bottom wall part 152 also has two side surfaces opposite in the first direction D1, the notch section 1524 is arranged on one of the side surfaces, and the notch section 1524 forms the first weak part 1521.

[0094] The notch section 1524 includes a plurality of spaced grooves 15241. In the first direction D1, the thickness of the groove 15241 is less than the thickness of the part of the bottom wall part 152 except the first weak part 1521, and the thickness of the notch section 1524 is the residual thickness of the bottom wall part 152 at the notch section 1524. The plurality of grooves 15241 are sequentially arranged to form the notch section 1524.

[0095] It should be understood that, due to the spaced arrangement of the two grooves 15241 of the notch section 1524, the connecting part between the two grooves 15241 forms a reinforcing rib structure, so that the notch section 1524 is not easy to break during normal use of the battery monomer 100, improving the safety and reliability of the battery monomer 100.

[0096] In some embodiments, as shown in Figure 11 , the groove 15241 has a geometric center, and the geometric center distance between adjacent grooves 15241 is D, which satisfies: 0.5 mm ≤ D ≤ 5 mm. When the number of notch sections 1524 is multiple, the center distance between adjacent grooves 15241 in the plurality of notch sections 1524 can be the same or different.

[0097] In the embodiment, the geometric center distance of the adjacent grooves 15241 in the plurality of score segments 1524 is the same. The geometric center distance of the adjacent grooves 15241 in the score segments 1524 can be: D = 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, etc. When D < 0.5mm, the bottom wall part 152 of the insulating piece 150 is prone to tearing and breaking during the process, reducing product yield; when T > 5mm, the bottom wall part 152 of the insulating piece 150 is not easy to tear at the weak part 1521 under internal pressure impact, and cannot timely relieve pressure.

[0098] In some embodiments, the first weak part 1521 includes a plurality of indentation grooves, and each indentation groove 1522 is arranged in parallel, intersected or enclosed to form a closed loop shape.

[0099] In some embodiments, the first weak part 1521 includes a plurality of score segments 1524, and each score segment 1524 is arranged in parallel, intersected or enclosed to form a closed loop shape.

[0100] As shown in Figure 10 , the indentation groove 1522 or the score segment 1524 is in a straight line shape, and two indentation grooves 1522 or two score segments 1524 are arranged in parallel along the third direction D3. It can be understood that the indentation groove 1522 or the score segment 1524 can also be in a curved shape, and three, four or other numbers of indentation grooves 1522 or score segments 1524 can also be arranged in parallel along the third direction D3.

[0101] As shown in Figure 7 and Figure 8 , the indentation groove 1522 or the score segment 1524 is in a straight line shape, and two indentation grooves 1522 or two score segments 1524 are intersected to form a cross shape or an X shape. It can be understood that the indentation groove 1522 or the score segment 1524 can also be in a curved shape, and three, four or other numbers of indentation grooves 1522 or score segments 1524 can also be arranged in parallel along the third direction D3.

[0102] As shown in Figure 9 , the indentation groove 1522 is in a straight line shape or a curved shape, the score segment 1524 is in a straight line shape or a curved shape, and a plurality of indentation grooves 1522 or a plurality of score segments 1524 are enclosed to form a closed loop shape.

[0103] The closed loop shape refers to a planar shape with a closed edge. For example, the closed loop shape is the same as the outer peripheral structure of the pressure relief mechanism 120, and for example, the closed loop structure can also be in an elliptical shape, a rectangular shape, a field shape, etc. The specific structure of the closed loop shape can be set as required.

[0104] In some embodiments, the bottom wall portion 152 extends in the second direction D2, and a plurality of first conductive holes 1523 are defined on the bottom wall portion 152. The first conductive holes 1523 penetrate the bottom wall portion 152 along the first direction D1. The first conductive holes 1523 and the first weak portion 1521 are spaced apart along the second direction D2. The first conductive holes 1523 are used to discharge gas from the insulating member 150.

[0105] In some embodiments, a gap is formed between the periphery of the electrode assembly 130 and the insulating member 150, and a plurality of first conductive holes 1523 are also arranged around the periphery of the electrode assembly 130 to facilitate the discharge of gas between the periphery of the electrode assembly 130 and the insulating member 150. There are multiple first conductive holes 1523, and the first conductive holes 1523 are arranged on both sides of the first weak portion 1521 along the second direction D2.

[0106] like Figure 6 As shown, in this embodiment, three first conductive holes 1523 are respectively provided on both sides of the electrode assembly 130, and the three first conductive holes 1523 are spaced apart along the third direction D3. In other embodiments, the number and size of the first conductive holes 1523 can be set as required.

[0107] In some embodiments, the support member 160 has a protruding structure 164 on the side facing the first wall 111, and the protruding structure 164 abuts the first wall 111 to define an exhaust space 170 between the support member 160 and the first wall 111; and / or, the support member 160 is provided with at least one exhaust hole 1611, and the at least one exhaust hole 1611 forms a second weak portion 161.

[0108] The exhaust hole 1611 penetrates the support member 160 along the first direction D1 , and an orthographic projection of the exhaust hole 1611 on the first wall 111 along the first direction D1 at least partially falls within the pressure relief mechanism 120 .

[0109] A pressure relief hole 1111 is defined on the first wall 111 . The pressure relief mechanism 120 is disposed in the pressure relief hole 1111 . The exhaust hole 1611 is in communication with the pressure relief mechanism 120 .

[0110] In some embodiments, the support member 160 further defines a second conductive hole 162. The orthographic projection of the second conductive hole 162 on the bottom wall portion 152 along the first direction D1 at least partially overlaps with the first conductive hole 1523. The second conductive hole 162 extends through the support member 160 along the first direction D1. During normal use of the battery cell 100, gas within the insulating member 150 flows through the first conductive hole 1523 and the second conductive hole 162 to the pressure relief mechanism 120.

[0111] The second through holes 162 and the exhaust hole 1611 are arranged at intervals along the second direction D2, and the second through holes 162 communicate the first through holes 1523 and the exhaust space 170.

[0112] In the embodiment, the number of the exhaust hole 1611 is one, and the exhaust hole 1611 and the first weak part 1521 are opposite in position, and the projection of the first weak part 1521 is located in the exhaust hole 1611 in the first direction D1, so that all the indentation grooves 1522 or the score segments 1524 can be completely cracked to smoothly release pressure when the battery monomer 100 is in thermal runaway.

[0113] In other embodiments, the number of the exhaust hole 1611 is multiple, and the size and shape of each exhaust hole 1611 are set according to the specific shape of the first weak part 1521. For example, as shown in Figure 7 , the first weak part 1521 is in the shape of a cross, and the exhaust hole 1611 can also be correspondingly provided in the shape of a cross; for example, as shown in Figure 8 , the first weak part 1521 is in the shape of X, and the exhaust hole 1611 can also be correspondingly provided in the shape of X; for example, as shown in Figure 10 , the first weak part 1521 includes two indentation grooves 1522, and the number of the exhaust hole 1611 is two, and one exhaust hole 1611 is correspondingly arranged with one indentation groove 1522.

[0114] As shown in Figure 6 , in the embodiment, the support 160 is provided with one second through hole 162 corresponding to the position of each first through hole 1523, so as to facilitate smooth exhaust.

[0115] In some embodiments, as shown in Figure 2 and Figure 3 , the support 160 is also provided with a plurality of third through holes 163, which communicate with the exhaust space 170 and are used to exhaust the gas in the shell 110.

[0116] In some embodiments, the first weak part 1521 is arranged on the side of the bottom wall part 152 facing the first wall 111, and / or the first weak part 1521 is arranged on the side of the bottom wall part 152 facing the electrode assembly 130.

[0117] When the first weak part 1521 is arranged on the side of the bottom wall part 152 close to the first wall 111 or the first weak part 1521 is arranged on the side of the bottom wall part 152 close to the electrode assembly 130, the processing steps of the insulating part 150 can be simplified, and when the insulating part 150 is assembled, the front and back of the insulating part 150 can be quickly distinguished, thereby improving the assembly efficiency.

[0118] Among them, the first weak portion 1521 is arranged on the side of the bottom wall portion 152 close to the first wall 111, and when the first weak portion 1521 is arranged on the side of the bottom wall portion 152 close to the electrode assembly 130, the indentation grooves 1522 and the notched segments 1524 on both sides are staggered and do not overlap, thereby preventing the bottom wall portion 152 from being easily torn and damaged during the manufacturing process.

[0119] The present application also provides a battery comprising the battery cell 100 of any of the above embodiments. The battery cell 100 of any of the above embodiments has all the advantages of the battery cell 100 of any of the above embodiments, which will not be described in detail here.

[0120] An embodiment of the present application further provides an electrical device, comprising the battery cell 100 in any of the above embodiments or the battery in any of the above embodiments.

[0121] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0122] Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and electric tools, among others. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, among others; electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, among others; and electric tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, among others. The embodiments of the present application do not impose any particular restrictions on the above-mentioned electrical devices.

[0123] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0124] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A battery cell (100) having a first direction (D1), characterized in that: include: A housing (110) is provided with an accommodating cavity (113), and the housing (110) has a first wall (111), the first wall (111) is located on one side of the housing (110) along the first direction (D1), and the housing (110) further has an opening (114) on a side away from the first wall, the opening (114) being connected to the accommodating cavity (113); An electrode assembly (130) is disposed in the accommodating cavity (113); A top cover assembly (140) is sealed on the opening (114); a pressure relief mechanism (120) disposed on the first wall (111), the pressure relief mechanism (120) being used to release pressure when the battery cell (100) experiences thermal runaway; an insulating member (150) covering at least a portion of the electrode assembly (130), wherein the insulating member (150) is at least partially disposed between the electrode assembly (130) and the first wall (111), and a first weak portion (1521) is provided on the insulating member (150) at a position corresponding to the pressure relief mechanism (120); A support member (160) is disposed between the first wall (111) and the insulating member (150), and a second weak portion (161) is provided on the support member (160); The first weak portion (1521) and the second weak portion (161) are used to allow gas to pass through the first weak portion (1521) and the second weak portion (161) and reach the pressure relief mechanism (120) when the battery cell (100) experiences thermal runaway.

2. The battery cell (100) according to claim 1, characterized in that Along the first direction (D1), the orthographic projection of the second weak portion (161) on the first wall (111) at least partially falls on the pressure relief mechanism (120).

3. The battery cell (100) according to claim 1, characterized in that The insulating member (150) includes two peripheral wall portions (151) and a bottom wall portion (152), wherein the two peripheral wall portions (151) are respectively arranged on both sides of the bottom wall portion (152), and the bottom wall portion (152) is covered on the bottom surface of the electrode assembly (130), and corresponding to the first wall (111), the two peripheral wall portions (151) are respectively wrapped around at least two opposite side surfaces of the electrode assembly (130), and the first weak portion (1521) is arranged on the bottom wall portion (152).

4. The battery cell (100) according to claim 3, characterized in that The bottom wall portion (152) has an indentation groove (1522), and the bottom wall portion (152) further has two side surfaces opposite to each other along the first direction (D1), the indentation groove (1522) is provided on one of the side surfaces, and the indentation groove (1522) forms the first weak portion (1521); Along the first direction (D1), the thickness of the indentation groove (1522) is smaller than the thickness of the bottom wall portion (152) except the first weak portion (1521).

5. The battery cell (100) according to claim 3, characterized in that: The bottom wall portion (152) has a notched section (1524), and the bottom wall portion (152) further has two side surfaces that are opposite to each other along the first direction (D1), the notched section (1524) being arranged on one of the side surfaces, and the notched section (1524) forming the first weak portion (1521); The scoring segment (1524) includes a plurality of grooves (15241) arranged at intervals. Along the first direction (D1), the thickness of the grooves (15241) is less than the thickness of the bottom wall portion (152) other than the first weak portion (1521). The plurality of grooves (15241) are arranged to form the scoring segment (1524).

6. The battery cell (100) according to claim 4, characterized in that The first weak portion (1521) includes a plurality of indentation grooves (1522), and the plurality of indentation grooves (1522) are arranged parallel to each other, cross-arranged, or enclosed to form a closed loop shape.

7. The battery cell (100) according to claim 5, characterized in that The first weak portion (1521) includes a plurality of notched segments (1524), and the plurality of notched segments (1524) are arranged parallel to each other, cross-arranged, or enclosed to form a closed loop shape.

8. The battery cell (100) according to any one of claims 3 to 7, characterized in that: The battery cell (100) further has a second direction (D2), the second direction (D2) being perpendicular to the first direction (D1), the bottom wall portion (152) extending in the second direction (D2), and a first conducting hole (1523) being provided on the bottom wall portion (152), the first conducting hole (1523) penetrating the bottom wall portion (152) along the first direction (D1), and the first conducting hole (1523) and the first weak portion (1521) being spaced apart along the second direction (D2).

9. The battery cell (100) according to claim 8, characterized in that: There are a plurality of first conducting holes (1523), and the first conducting holes (1523) are arranged on both sides of the first weak portion (1521) along the second direction (D2).

10. The battery cell (100) according to claim 8, characterized in that The support member (160) has a protruding structure (164) on one side facing the first wall (111), and the protruding structure (164) abuts against the first wall (111), so that an exhaust space (170) is defined between the support member (160) and the first wall (111); and / or The support member (160) is provided with at least one exhaust hole (1611), the exhaust hole (1611) forming the second weak portion (161), the exhaust holes (1611) all pass through the support member (160) along the first direction (D1), and the orthographic projection of at least one exhaust hole (1611) on the first wall (111) along the first direction (D1) at least partially falls on the pressure relief mechanism (120).

11. The battery cell (100) according to claim 10, characterized in that: The support member (160) is provided with a second conductive hole (162), and along the first direction (D1), the orthographic projection of the second conductive hole (162) on the bottom wall portion (152) at least partially overlaps with the first conductive hole (1523), and the second conductive hole (162) passes through the support member (160) along the first direction (D1).

12. The battery cell (100) according to claim 3, characterized in that The first weak portion (1521) is provided on a side of the bottom wall portion (152) facing the first wall (111), and / or the first weak portion (1521) is provided on a side of the bottom wall portion (152) facing the electrode assembly (130).

13. A battery pack, characterized in that: A battery cell (100) comprising the battery cell according to any one of claims 1 to 12.

14. An electrical device, characterized in that: Including the battery pack according to claim 13.

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