An electrical device and a quadrangular prism battery therefor

Abstract

This invention relates to the field of new energy battery technology, and discloses an electrical device and its battery. The battery includes a casing with an opening at at least one end along a first direction; a cover that covers and closes the opening; a battery cell disposed inside the casing, one of the surfaces of the battery cell perpendicular to the first direction being a first side surface; and a protruding member disposed on the inner wall of the casing, protruding from the surface of the inner wall towards the direction of the battery cell, the inner wall being perpendicular to the surface of the cover, and the surface of the battery cell opposite to the protruding member being a side surface; wherein the distance between the protruding member and the battery cell is H mm, and the area of ​​the surface of the protruding member facing the battery cell is S1 mm². 2 The area of ​​the first side face is S2mm. 2 The following conditions must be met: 0 mm ≤ H ≤ 5 mm, 0.005 ≤ S1 / S2 ≤ 1.3. This invention, through its structure, increases the strength of the casing when the battery expands and deforms, while also reducing damage to the battery cell caused by casing deformation, thus improving battery safety.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy batteries, in particular to a power consuming device and a quadrangular prism battery thereof. BACKGROUND

[0002] At present, in the use process of the battery, the battery cell is prone to swelling. When the battery cell swells, an outward force is generated, causing the shell of the battery to deform. Once the shell deforms, the original flat and regular internal structure is destroyed, and the deformed part will abnormally press the components inside the battery in an irregular manner. This abnormal pressing will cause serious damage to the fine structure and components inside the battery, thereby affecting the overall performance, safety and service life of the battery, and even may cause short circuit, overheating and other serious faults of the battery, which has great safety hazards. SUMMARY

[0003] The purpose of the present application is to provide a power consuming device and a quadrangular prism battery thereof, which can improve the safety of the quadrangular prism battery.

[0004] In order to achieve the above-mentioned purpose, one aspect of the present application provides a quadrangular prism battery, comprising:

[0005] a shell, which is provided with an opening part at at least one end in a first direction;

[0006] a cover body, which covers and closes the opening part;

[0007] a battery cell, which is arranged inside the shell;

[0008] a convex part, which is arranged on the inner wall of the shell, the convex part protrudes the surface of the inner wall in the direction of the battery cell, the inner wall where the convex part is located is perpendicular to the surface of the cover body, and the surface of the battery cell opposite to the convex part is a side surface part;

[0009] wherein the distance between the convex part and the side surface part is H, the unit of H is mm, the area of the surface of the convex part facing the battery cell is S1, the unit of S1 is mm 2 , the area of the side surface part is S2, the unit of S2 is mm 2 , and the following conditions are met: 0 mm ≤ H≤5mm, 0.005≤S1 / S2≤ 1.3.

[0010] Another aspect of the present application provides a power consuming device, comprising a bottom plate and the above-mentioned quadrangular prism battery, the quadrangular prism battery is fixedly connected to the bottom plate, and the cover body and the bottom plate are arranged in parallel.

[0011] The present application provides a power consuming device and a quadrangular prism battery thereof, which has the following advantages compared with the prior art:

[0012] The quadrangular prism battery of the present application, the convex part is arranged inside the shell, when the battery expands and deforms, the strength of the shell can be increased, and the damage of the shell deformation to the battery cell can be reduced, and the safety of the battery is improved. By limiting S1 / S2, the damage of the convex part to the battery cell can be reduced, so as to reduce the generation of lithium precipitation or short circuit of the battery cell, and improve the safety of the battery; and the convex part does not hinder the storage space of the electrolyte in the battery, ensures the infiltration rate of the electrolyte of the battery cell, guarantees the cycle life of the battery, and provides more diffusion channels for gas and liquid. At the same time, by limiting H, the convex part can play a good supporting role on the battery cell.

[0013] The electric device of the present application comprises the above-mentioned quadrangular prism battery, when the battery expands and deforms, the strength of the shell can be increased, and the damage of the shell deformation to the battery cell can be reduced, and the cycle life of the battery is guaranteed, and the safety of the electric device is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural schematic diagram of the battery of the embodiment of the present application.

[0015] Figure 2 is a structural schematic diagram of the battery of the embodiment of the present application.

[0016] Figure 3 is a schematic diagram of the convex part and the shell of the embodiment of the present application.

[0017] Figure 4 is a schematic diagram of the convex part and the shell of another embodiment of the present application.

[0018] Figure 5 is a structural schematic diagram of the battery of another embodiment of the present application.

[0019] Figure 6 is Figure 1 the sectional view at A-A in FIG.

[0020] Figure 7 is Figure 6 the enlarged schematic diagram at B in FIG.

[0021] Figure 8 is Figure 1 the sectional view at A-A of another embodiment in FIG.

[0022] Figure 9 is Figure 1 the sectional view at A-A of another embodiment in FIG.

[0023] Figure 10 is Figure 1 the sectional view at C-C in FIG.

[0024] Figure 11 is Figure 10 is an enlarged schematic view of D in

[0025] Figure 12 is Figure 6 is a schematic view of the position of the convex part and pressure relief structure of

[0026] Figure 13 is a schematic view of part of the structure of the battery of an embodiment of the application.

[0027] In the drawings: 1, housing; 2, cover; 3, cell; 4, convex part; 5, pressure relief structure; 6, insulating part; 7, pole; 11, opening; 121, first side; 122, second side; 21, liquid injection channel; 31, side part; 41, first convex part; 42, second convex part; 43, third convex part; 44, fourth convex part; 61, through hole; Z, first direction; Y, third direction; X, second direction. DETAILED DESCRIPTION

[0028] The specific embodiments of the application will be further described with reference to the drawings and examples. The following examples are intended to illustrate the application, but not to limit the scope of the application.

[0029] In the description of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" 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 therefore cannot be understood as indicating or implying 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. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside 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.

[0031] In addition, in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0032] The skilled person in the art will understand the specific meaning of the above terms in the present application according to the specific circumstances.

[0033] Please refer to Figure 1 and Figure 2 The battery of the embodiment of the present application comprises a shell 1, a cover 2, a battery cell 3 and a protruding part 4.

[0034] The shell 1 is provided with an opening part 11 on at least one end in the first direction Z.

[0035] The opening part 11 is in the form of a hole, and the opening part 11 is in communication with the inside of the shell 1. The shell 1 is provided with at least one opening part 11, and the opening part 11 is used for the battery cell 3 to pass in and out of the shell 1. In some embodiments, the opening part 11 is provided on one end of the shell 1, and in other embodiments, the opening part 11 is provided on both ends of the shell 1.

[0036] In the embodiment, the battery is in the form of a rectangular body, and the shell 1 is also in the form of a rectangular body. The shell 1 is a square shell, i.e., the battery is a four-prism battery. The R angle of one surface of the shell 1 can be a right angle or an arc angle. The shell 1 is provided with a receiving cavity inside, which is used to place the battery cell. The battery cell passes in and out of the receiving cavity inside the shell 1 through the opening part 11. The shell 1 can improve the strength of the battery and avoid damage to the battery cell inside the battery. The material of the shell includes but is not limited to copper, iron, aluminum, stainless steel and aluminum alloy.

[0037] In the embodiment, the height direction of the shell 1 is the first direction Z, the length direction of the shell 1 is the second direction X, and the width direction of the shell 1 is the third direction Y.

[0038] The first direction Z, the third direction Y and the second direction X intersect with each other, and in the embodiment, they are perpendicular to each other. The perpendicularity refers to a state in which the angle is 85°~95°.

[0039] The opening part 11 of the shell 1 can be arranged in the height direction, or arranged in the length direction or the width direction. Figure 5 .

[0040] The cover 2 covers and seals the opening part 11.

[0041] After the cover 2 is installed on the shell 1, it can seal the opening part 11 and prevent the electrolyte from flowing out of the opening part 11. The cover 2 seals the opening part 11, which can be achieved by welding, bonding, riveting and the like with the shell 1. The welding can be laser welding, ultrasonic welding, resistance welding and the like. The material of the cover includes but is not limited to copper, iron, aluminum, stainless steel and aluminum alloy.

[0042] The battery cell 3 is arranged inside the shell 1.

[0043] The electric core 3 includes a separator and two kinds of polar pieces with opposite polarity, namely a positive polar piece and a negative polar piece, and the electric core 3 is made by adopting a laminating or winding manufacturing process. The electrode assembly works by moving metal ions between the positive polar piece and the negative polar piece. The cycle process of the electric core 3 is the process that the metal ions move from the positive polar piece to the negative polar piece and then move from the negative polar piece to the positive polar piece. The electrode assembly also includes a tab, and the tab is electrically connected with the polar piece, wherein the positive tab is electrically connected with the positive polar piece, and the negative tab is electrically connected with the negative polar piece, and the electric core 3 realizes charging and discharging through the positive tab and the negative tab. The polar piece includes a current collector and an active material layer, and the active material layer is coated on the surface of the current collector. If the polar piece is the positive polar piece, the material of the current collector can be aluminum, and the material of the active material layer can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. If the polar piece is the negative polar piece, the material of the current collector can be copper, and the material of the active material layer can be graphite, carbon or silicon, etc.

[0044] Please refer to Figure 3 and Figure 4 , the convex part 4 is arranged on the inner wall of the shell 1, and the convex part 4 protrudes from the surface of the inner wall in the direction of the electric core 3, and the inner wall where the convex part 4 is located is perpendicular to the surface of the cover 2, and the surface of the electric core 3 opposite to the convex part 4 is a side part 31.

[0045] The arrangement mode of the convex part 4 on the inner wall of the shell 1 can be that the convex part 4 is integrally formed with the inner wall of the shell 1, or the convex part 4 is fixedly connected on the inner wall of the shell 1 in a welding, bonding or other mode.

[0046] The material of the convex part 4 can be a metal material, such as aluminum, steel, etc.

[0047] Gas will be generated in the process of charging the battery, which will cause the electric core 3 to expand and deform in all directions, and the shell 1 will be deformed under pressure, which will cause damage to the electric core 3. The convex part 4 is arranged on the inner wall of the shell 1 as a structural part, thereby strengthening the shell 1, making the shell 1 not easy to deform, forming a physical buffer structure, providing more effective protection for the electric core 3, and also reducing the damage to the electric core 3 caused by the deformation of the shell 1.

[0048] Please refer to Figure 6 and Figure 7 , the distance between the convex part 4 and the side part 31 is H, the unit of H is mm, the area of the surface of the convex part 4 facing the electric core 3 is S1, and the unit of S1 is mm 2 , the area of the side part 31 is S2, and the unit of S2 is mm 2 , and it satisfies: 0mm ≤ H≤ 5 mm, 0.005≤S1 / S2≤1.3.

[0049] Preferably, H can be 0, 2, 4, 5, etc., and S1 / S2 can be 0.005, 0.05, 0.16, 0.39, 0.64, 1.08, 1.3, etc.

[0050] The surface of the convex part 4 facing the battery cell 3 is parallel to the inner wall of the shell 1 where the convex part 4 is located, and the area of the surface of the convex part 4 facing the battery cell 3 is the area of the surface.

[0051] The side part 31 of the battery cell 3 is the side of the battery cell 3 opposite to the convex part 4, in other words, the side part 31 is parallel to the inner wall of the shell 1 where the convex part 4 is located, and the area of the side part 31 is the area of the side.

[0052] When the convex part 4 is only arranged on one inner wall of the shell 1, the area of the side part 31 is the area of the side opposite to the convex part 4.

[0053] When the convex part 4 is arranged on multiple inner walls of the shell 1, the side part 31 is the side of the battery cell 3 corresponding to the multiple convex parts 4, and the area of the side part 31 is the sum of the areas of the sides.

[0054] When the number of battery cells 3 is multiple, the sum of the areas of the side parts 31 of the battery cells 3 is calculated.

[0055] When measuring the size H, a common length measuring tool can be used, such as a ruler or a tape measure.

[0056] Specifically, when measuring H, a battery with the battery cell 3 assembled inside the shell 1 is taken, and on the cross section perpendicular to the height direction of the battery, the distance between the convex part 4 and the battery cell 3 is measured by a length measuring tool, and the measurement is taken multiple times and averaged to obtain the distance H between the convex part 4 and the battery cell 3.

[0057] When calculating S1, the size required according to the shape of the surface of the convex part 4 facing the battery cell 3 is measured, such as in the embodiment, the surface of the convex part 4 facing the battery cell 3 is rectangular, and the length and width of the surface are measured by a length measuring tool, and the measurement is taken multiple times and averaged, and the product of the two is taken to obtain the area S1 of the surface of the convex part 4 facing the battery cell 3. In other embodiments, the surface of the convex part 4 facing the battery cell 3 can also be other shapes, such as triangular, circular, etc.

[0058] When calculating S2, the size required according to the shape of the surface of the side part 31 is measured, such as in the embodiment, the side part 31 is rectangular, and the length and width of the surface are measured by a length measuring tool, and the measurement is taken multiple times and averaged, and the product of the two is taken to obtain the area S2 of the side part 31.

[0059] When H is within the above range, the battery cell 3 can be sufficiently supported. If it is too large, it cannot play a supporting role.

[0060] When S1 / S2 is within the above range, the damage of the convex part 4 to the battery cell 3 can be reduced, thereby reducing the generation of lithium precipitation or short circuit of the battery cell 3, and the space utilization rate inside the shell 1 can be ensured, the convex part 4 does not hinder the infiltration rate of the electrolyte, the cycle life of the battery is ensured, and more diffusion channels for gas and liquid are provided. If the value is too small, when the battery cell 3 expands, the convex part 4 with a small area ratio will cause stress concentration on the surface of the battery cell 3, resulting in a large extrusion force on the battery cell 3, surface damage of the battery cell 3, and increased risk of short circuit caused by lithium precipitation of the pole piece of the battery cell 3 and the overlap of the positive and negative electrodes. If the value is too large, the convex part 4 with a large area ratio occupies a large amount of free space between the battery cell 3 and the shell 1, reducing the space utilization rate inside the shell 1, affecting the flow of the electrolyte, reducing the infiltration rate of the electrolyte of the battery cell 3, and affecting the overall cycle life of the battery. At the same time, the flow of gas is affected, making it difficult for the battery to release pressure in time.

[0061] Further, it also satisfies: 0 mm ≤ H≤4.5mm, 0.008≤S1 / S2≤ 1.2.

[0062] Preferably, H can be 0, 1, 3, 4.5, etc., and S1 / S2 can be 0.008, 0.07, 0.16, 0.52, 0.97, 1.2, etc.

[0063] When the two ranges are satisfied, the battery cell 3 can be sufficiently supported, the generation of lithium precipitation or short circuit of the battery cell 3 can be reduced, the space utilization rate inside the shell 1 can be ensured, the cycle life of the battery can be ensured, and more diffusion channels for gas and liquid can be provided.

[0064] The shell 1 includes two oppositely arranged first side surfaces 121 and two oppositely arranged second side surfaces 122, the area of the first side surface 121 is larger than the area of the second side surface 122, and the first side surface 121 and the second side surface 122 are perpendicular to the surface of the cover 2.

[0065] In this embodiment, the first side surface 121 is a side surface formed by the length and height of the shell 1, and the second side surface 122 is a side surface formed by the width and height of the shell 1.

[0066] In this embodiment, the battery cell 3 is rectangular, and the side surface part 31 is a large surface of the battery cell 3, that is, two mutually parallel side surfaces with an area obviously larger than the other four side surfaces are large surfaces.

[0067] The first side surface 121 is also a large surface of the shell 1, and the area of the first side surface 121 is obviously larger than the side surface where the opening part 11 is located.

[0068] The side surface part 31 is not arranged towards the opening part 11, in other words, the plane where the opening part 11 is located is not parallel to the large surface of the battery cell 3.

[0069] The convex part 4 is arranged on the first side surface 121, and also satisfies 0.008≤S1 / S2≤0.8.

[0070] Preferably, S1 / S2 can be 0.008, 0.07, 0.16, 0.34, 0.53, 0.8, etc.

[0071] In this case, the side surface part 31 is a large surface of the battery cell 3, and the large surface of the battery cell 3 is arranged opposite to the large surface of the shell 1.

[0072] During the expansion of the battery cell 3, the large surface of the battery cell 3 is the area most prone to expansion, and the large surface of the shell 1 is also the area directly affected. The convex part 4 arranged on the large surface of the shell 1 can improve the strength of the large surface of the shell 1 and also ensure the space utilization rate inside the shell 1, without hindering the infiltration of the electrolyte, thereby better protecting the battery. In order to reduce damage to the battery cell 3, the value of S1 / S2 cannot be too small to prevent the convex part 4 from scratching the battery cell 3, thereby reducing the generation of lithium precipitation or short circuit of the battery cell 3.

[0073] In some embodiments, referring to Figure 8 The convex part 4 is arranged on the first side surface 121 of one side of the battery cell 3, and also satisfies 0.025≤S1 / S2≤0.8.

[0074] Preferably, S1 / S2 can be 0.025, 0.04, 0.19, 0.26, 0.47, 0.66, 0.8, etc.

[0075] The convex part 4 is arranged on one side of the battery cell 3, which can not only strengthen the shell 1 and protect the battery cell 3, but also control the occupied space of the structure. On the premise of ensuring the strength of the shell 1 and the protection performance of the battery cell 3, the single-sided arrangement of the convex part 4 reduces the occupation of the limited space inside the battery, reserves sufficient space for the layout of other components inside the battery and the electrolyte filling process, and effectively improves the compactness and space utilization rate of the overall structure of the battery.

[0076] In some embodiments, the convex part 4 is arranged on the first side surface 121 of the opposite two sides of the battery cell 3, and also satisfies 0.05≤S1 / S2≤0.8.

[0077] Preferably, S1 / S2 can be 0.05, 0.16, 0.34, 0.55, 0.79, 0.8, etc.

[0078] The convex part 4 is arranged on both sides of the battery cell 3, which can better protect both sides of the battery cell 3, and the shell 1 on both sides is also reinforced, thereby improving the strength of the shell 1.

[0079] In some embodiments, the convex component 4 includes a first convex component 41 and a second convex component 42, which are respectively located on opposite sides of the battery cell 3, and the orthographic projections of the first convex component 41 and the second convex component 42 on the same first side surface 121 at least partially overlap.

[0080] The first convex component 41 and the second convex component 42 are arranged in a symmetrical manner, and can form a symmetrical and uniform support force distribution when the battery cell 3 expands. When the battery cell 3 expands due to the charging and discharging process, the first convex component 41 and the second convex component 42 arranged symmetrically can synchronously and equally bear the lateral pressure applied by the battery cell 3, avoid stress concentration phenomenon caused by uneven local stress, effectively inhibit deformation deviation of the battery cell 3 caused by force imbalance, provide stable and balanced constraint support for the battery cell 3, and ensure the structural stability and safety of the battery under complex working conditions.

[0081] In some embodiments, referring to Figure 9 , the orthographic projections of the first convex component 41 and the second convex component 42 on the same first side surface 121 are spaced apart from each other.

[0082] Through such a structure, the risk of stress concentration when the battery cell 3 expands can be effectively avoided. When the battery cell 3 deforms due to the charging and discharging process, the two-side convex components 4 can avoid forming opposite pressing forces, prevent irreversible damage to the local area of the battery cell 3 caused by instantaneous superimposed stress, and thus significantly reduce the risk of structural failure of the battery cell 3, prolong the service life of the battery, and ensure the safety and reliability of the battery in the whole life cycle.

[0083] In some embodiments, the convex component 4 is arranged on the second side surface 122, and also satisfies 0.02≤S1 / S2≤1.2.

[0084] Preferably, S1 / S2 can be 0.02, 0.1, 0.35, 0.44, 0.68, 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0085] In this case, the side surface part 31 is not a large surface of the battery cell 3.

[0086] Since the side surface part 31 corresponds to the bending structure of the internal pole piece of the battery cell 3, this area is prone to stress concentration phenomenon during the operation of the battery. When the battery expands, the convex component 4 will produce a pressing effect on the bending part of the battery cell 3, intensify the local pressure and deformation, and thus significantly increase the risk of lithium precipitation of the battery cell 3.

[0087] When the above range is satisfied, the acting area of the convex component 4 increases, thereby reducing the contact pressure of the convex component 4 on the side surface part 31, and further delaying the occurrence of lithium precipitation.

[0088] In some embodiments, the convex component 4 is arranged on the second side surface 122 of one side of the battery cell 3, and also satisfies 0.025≤S1 / S2≤0.8.

[0089] Preferably, S1 / S2 can be 0.025, 0.2, 0.41, 0.56, 0.77, 0.8, etc.

[0090] Since there is a problem of complex electrolyte infiltration path and low infiltration efficiency at the bending position of the pole piece of the battery cell 3, the convex component 4 is arranged on one side of the battery cell 3, which can avoid excessive occupation of the limited space inside the shell 1, and at the same time, by reserving sufficient space in this area, the infiltration range of the electrolyte can be effectively expanded, the ion transmission path is shortened, and the infiltration effect of the electrolyte on the electrode material is significantly improved, thereby improving the charge-discharge performance and cycle stability of the battery.

[0091] In some embodiments, the convex component 4 is arranged on the second side surface 122 of the opposite two sides of the battery cell 3, and also satisfies 0.05≤S1 / S2≤1.2.

[0092] Preferably, S1 / S2 can be 0.05, 0.13, 0.26, 0.45, 0.66, 0.8, etc.

[0093] The convex component 4 is arranged on both sides of the battery cell 3, which can better protect both sides of the battery cell 3, and at the same time, the shell 1 on both sides is reinforced, and the strength of the shell 1 is higher.

[0094] In some embodiments, the convex component 4 includes a third convex component 43 and a fourth convex component 44, the third convex component 43 and the fourth convex component 44 are respectively located on opposite sides of the battery cell 3, and the third convex component 43 and the fourth convex component 44 at least partially overlap in the orthographic projection on the same second side surface 122.

[0095] The third convex component 43 and the fourth convex component 44 are arranged in a symmetrical manner, which can form a symmetrical and uniform distribution of supporting force when the battery cell 3 expands. When the battery cell 3 expands due to the charging and discharging process, the symmetrically arranged convex component 4 can synchronously and equally bear the lateral pressure applied by the battery cell 3, avoiding stress concentration phenomenon caused by uneven local stress, thereby effectively inhibiting the deformation deviation of the battery cell 3 caused by unbalanced stress, providing stable and balanced constraint support for the battery cell 3, and ensuring the structural stability and safety of the battery under complex working conditions.

[0096] In some embodiments, the orthographic projection of the third convex component 43 and the fourth convex component 44 on the same second side surface 122 is spaced apart from each other.

[0097] Through such a structure, the risk of stress concentration when the battery cell 3 expands can be effectively avoided. When the battery cell 3 expands due to the charging and discharging process, the two side protruding parts 4 can avoid forming a counter-pressing force, preventing irreversible damage to the local area of the battery cell 3 due to instantaneous stress superposition, thereby significantly reducing the risk of structural failure of the battery cell 3, prolonging the service life of the battery, and ensuring the safety and reliability of the battery throughout its life cycle.

[0098] In some embodiments, the protruding part 4 extends to the opening part 11 in the first direction Z.

[0099] Extending the protruding part 4 to the opening part 11 position can strengthen the local structure at the opening, inhibit the deformation trend caused by stress concentration, and facilitate assembly with the cover 2.

[0100] For the case where the housing 1 has opening parts 11 at both ends, the protruding part 4 extends to the opening part 11 at each end of the housing 1 in the first direction Z.

[0101] Both opening parts 11 can be strengthened by the presence of the protruding part 4, facilitating assembly with the cover 2.

[0102] The protruding part 4 is welded to the cover 2, and also satisfies: 0.008≤S1 / S2≤1.25.

[0103] Preferably, S1 / S2 can be 0.008, 0.095, 0.25, 0.47, 0.62, 0.89, 1, 1.17, 1.25, etc.

[0104] The opening part 11 is prone to inward bending deformation due to its structural characteristics, making the welding process more difficult and the welding quality unstable. The protruding part 4 not only stabilizes the local structure of the opening, but also provides a stable structural basis for the welding operation. During welding, the protruding part 4 can disperse welding thermal stress, improve welding quality and connection strength, thereby enhancing the overall sealing and structural reliability of the battery housing 1.

[0105] In some embodiments, the minimum distance between the end of each protruding part 4 near the opening part 11 and the opening part 11 in the first direction Z is d1, d1 is in mm, the size of the housing 1 in the first direction Z is D1, D1 is in mm, and satisfies: d1 / D1≥1 / 5, 0.008≤S1 / S2≤1.2.

[0106] Preferably, S1 / S2 can be 0.008, 0.065, 0.19, 0.33, 0.51, 0.74, 0.96, 1.13, 1.2, etc.

[0107] The middle region of the shell 1 is prone to plastic deformation under the action of battery charge and discharge cycles and external loads. When the above range is met, the convex part 4 is arranged at the middle of the shell 1 in the height direction of the shell 1, which can enhance the strength of the shell 1, change the stress transmission path, thereby inhibiting the local deformation trend, and further significantly improve the structural strength and deformation resistance of the shell 1 while maintaining the compact structure of the battery.

[0108] In measuring the size d1 and D1, a common length measuring tool can be used, such as a ruler, a tape measure, etc.

[0109] Specifically, when measuring d1, one end of the convex part 4 in the first direction Z is taken as a reference edge, the distance between the reference edge and one end of the shell 1 close to it in the first direction Z is measured by a length measuring tool, and the average value is obtained by measuring multiple times, thereby obtaining the distance d1 between one end of the convex part 4 in the first direction Z and one end of the shell 1 close to it in the first direction Z.

[0110] When measuring D1, the distance between the two ends of the shell 1 in the first direction Z is measured by a length measuring tool, and the average value is obtained by measuring multiple times, thereby obtaining the size D1 of the shell 1 in the first direction Z.

[0111] In some embodiments, it is also satisfied that 100mm²≤S1≤1500mm² and 1000mm²≤S2≤30000mm².

[0112] Preferably, S1 can take values of 100, 300, 590, 770, 940, 1150, 1340, 1500, etc., and S2 can take values of 1000, 5000, 10000, 16000, 21000, 25000, 30000, etc.

[0113] If S1 takes a too large value, the size of the convex part 4 is too large, which can block the electrolyte flow channel of the battery cell 3, and if S1 takes a too small value, the size of the convex part 4 is too small, which can easily pierce the battery cell 3 after expansion.

[0114] If S2 takes a too large value, it means that the size of the battery is too large, which can seriously squeeze the shell 1 after expansion, and the shell 1 is too tight for electrolyte to infiltrate; and if S2 takes a too small value, it means that the size of the battery is too small, which can easily shake the battery cell 3 in the shell 1, which can cause tearing of the tab and other problems.

[0115] In some embodiments, the first side surface 121 is formed on a plane formed by the length and height of the shell 1, that is, the first side surface 121 is formed by the length and height of the shell 1.

[0116] The convex part 4 is arranged on the first side surface 121, and the minimum distance between one end of each convex part 4 in the second direction X and the second side surface 122 close to the one end is d2, d2 is in mm, the size of the first side surface 121 in the second direction X is D2, D2 is in mm, and d2 / D2≥1 / 3 is satisfied.

[0117] When the above range is satisfied, the convex part 4 is arranged at the middle of the shell 1 in the length direction of the shell 1, the strength of the shell 1 can be enhanced, the stress conduction path is changed, the local deformation trend is inhibited, and the structural strength and deformation resistance of the shell 1 are significantly improved while maintaining the compact structure of the battery.

[0118] When measuring the size d2 and D2, a common length measuring tool can be used, such as a ruler, a tape measure, and the like.

[0119] Specifically, when measuring d2, the distance between the reference edge of one end of the convex part 4 in the second direction X and one end of the first side surface 121 close to the reference edge is measured by a length measuring tool, and the distance d2 between one end of the convex part 4 in the second direction X and one end of the first side surface 121 close to the one end is obtained by measuring multiple times and taking an average.

[0120] Specifically, when measuring D2, the distance between the two ends of the first side surface 121 in the first direction Z is measured by a length measuring tool, and the size D2 of the first side surface 121 in the second direction X is obtained by measuring multiple times and taking an average.

[0121] In some embodiments, the number of convex parts 4 can be one, or two or more.

[0122] When the number of convex parts 4 is multiple, the convex parts 4 are arranged on the first side surface 121 or the second side surface 122, and adjacent two convex parts 4 are spaced apart from each other.

[0123] The multiple convex parts 4 can collectively support the battery cell 3 when the battery cell 3 expands, share and withstand the lateral pressure applied by the battery cell 3, and avoid stress concentration phenomenon caused by uneven local stress.

[0124] When the number of convex parts 4 is one, the convex part 4 is further arranged on at least the inner wall corresponding to the adjacent first side surface 121 and second side surface 122, and further satisfies 0.005≤S1 / S2≤1.2.

[0125] Preferably, S1 / S2 can be 0.005, 0.01, 0.05, 0.1, 0.5, 1.0, 1.2, and the like.

[0126] The convex parts 4 arranged separately span the first side surface 121 and the second side surface 122, which is equivalent to increasing the wall thickness of the shell 1 and improving the strength of the shell 1.

[0127] In some embodiments, the convex parts 4 are arranged on the first side surface 121 or the second side surface 122, and each convex part 4 is arranged separately from each other.

[0128] The arrangement of multiple convex parts 4 can effectively disperse the load in a multi-point support manner, change the stress transmission path, and avoid local stress concentration. At the same time, the multiple convex parts 4 can also effectively strengthen the strength of the shell 1.

[0129] In some embodiments, the volume of the convex part 4 is V1, the unit of V1 is mm 3 , the internal volume of the shell 1 is V2, the unit of V2 is mm 3 , and satisfies: 8*10 -6 ≤V1 / V2≤0.024.

[0130] Preferably, V1 / V2 can be 8*10 -6 , 0.001, 0.005, 0.009, 0.014, 0.019, 0.024, etc.

[0131] If the value of V1 / V2 is too large, the volume of the convex part 4 is too large, which will reduce the utilization rate of the internal space of the battery, and also reduce the effective filling amount of the electrolyte due to occupying the infiltration path of the electrolyte, thereby affecting the ion transmission efficiency and electrochemical performance inside the battery. At the same time, the too large convex part 4 will also hinder the gas transmission path inside the battery, increase the risk of gas accumulation, and threaten the safety of the battery. If the value of V1 / V2 is too large, the volume of the convex part 4 is too small, and it is difficult to form an effective mechanical support structure, and it is difficult to fully play the reinforcing role of the shell 1.

[0132] When calculating V1, the required dimensions are measured according to the structure and shape of the convex part 4. In this embodiment, the convex part 4 is a rectangular body, and the length, width and height of the rectangular body are measured by a length measuring tool. The average value is taken by measuring multiple times, and the product of the three is taken to obtain the volume V1 of the convex part 4.

[0133] When calculating V2, the required dimensions are measured according to the shape of the shell 1. In this embodiment, the inside of the shell 1 is a rectangular cavity, and the length, width and height of the rectangular cavity are measured by a length measuring tool. The average value is taken by measuring multiple times, and the product of the three is taken to obtain the internal volume V2 of the shell 1.

[0134] In some embodiments, the battery further comprises a pressure relief structure 5 arranged on the cover body 2 or the shell 1.

[0135] When the battery is in the process of charging and discharging, the pressure inside the shell 1 rises sharply due to internal short circuit, overheating and other abnormal conditions, the pressure sensitive structure of the pressure relief structure 5 is triggered to open, and the gas accumulated inside the battery is quickly released to the external environment, preventing the battery from swelling, bursting or even fire and explosion due to high internal pressure.

[0136] Please refer to Figure 12 , the minimum distance between the projected edge of the convex part 4 on the cover 2 and the edge of the pressure relief structure 5 is h, the unit of h is mm, and it satisfies: 5 mm ≤ h≤ 130mm.

[0137] Optionally, h can take values such as 5, 15, 46, 58, 81, 103, 124, 130.

[0138] When the above range is satisfied, a smooth gas transmission path can be built inside the shell 1, so that the high-pressure gas generated inside the battery due to thermal runaway, side reaction, etc. can quickly flow to the pressure relief structure 5 and be discharged to the external environment in time through the pressure relief structure 5, thereby effectively avoiding the sudden rise of internal pressure caused by gas accumulation and ensuring the structural integrity and safety of the battery.

[0139] When measuring the size h, a general length measuring tool can be used, such as a ruler or a tape measure.

[0140] Specifically, when measuring h, the projected edge of the convex part 4 on the cover 2 is taken as the reference edge on the plane where the cover 2 is located, and the distance between the reference edge and the edge of the pressure relief structure 5 closest to it is measured by a length measuring tool. Measure multiple times and take the average to get the minimum distance h between the projected edge of the convex part 4 on the cover 2 and the edge of the pressure relief structure 5.

[0141] Some embodiments, please refer to Figure 10 and Figure 11 , the minimum distance between one end of the convex part 4 in the first direction Z towards the cover 2 and the cover 2 is L1, the unit of L1 is mm, and it satisfies: 0 mm ≤ L1≤ 10mm.

[0142] Optionally, L1 can take values such as 0, 2, 4, 5, 8, 10.

[0143] When the above range is satisfied, the setting of the convex part 4 will not block the exhaust passage, ensuring that the gas can always flow smoothly through the exhaust passage and be discharged in time through the pressure relief structure 5, maintaining the internal pressure balance of the battery.

[0144] When measuring the size L1, a general length measuring tool can be used, such as a ruler or a tape measure.

[0145] Specifically, when measuring L1, one end of the convex component 4 in the first direction Z towards the cover 2 is taken as a reference edge, the distance between the reference edge and the cover 2 in the first direction Z is measured by a length measuring tool, and the minimum distance L1 between the one end of the convex component 4 in the first direction Z towards the cover 2 and the cover 2 is obtained by measuring multiple times and taking an average value.

[0146] In some embodiments, the material of the convex component 4 includes at least one of aluminum, steel, and plastic.

[0147] The material of the convex component 4 can be an insulating material, or can be the same material as the shell 1, or can be formed by compounding an insulating material with the material of the shell 1.

[0148] In some embodiments, the convex component 4 is fixedly connected with the shell 1. This makes the position of the convex component 4 on the shell 1 stable, continuously provides reliable mechanical support and protection functions for the shell 1, and guarantees the stability and safety of the overall structure of the battery.

[0149] In some embodiments, the convex component 4 is integrally formed with the shell 1.

[0150] During the integral forming process, there is no interface gap and stress concentration point between the convex component 4 and the shell 1, which can make the external load uniformly conduct and avoid structural failure caused by weak connection links. This continuous and dense structure form improves the overall rigidity and anti-deformation ability of the shell 1 and enhances the protection performance of the battery cell 3.

[0151] In some embodiments, the quadrangular prism battery further includes a pole 7, the shape of the pole 7 is non-rectangular, the size of the pole 7 in the second direction X is k1, and the size of the pole 7 in the third direction Y is k2, which satisfies: k1>k2.

[0152] The pole 7 is the current output end of the quadrangular prism battery, the current output of the battery cell 3 is electrically connected with the pole 7, and the pole 7 is electrically connected with adjacent batteries to realize the series and parallel connection between the batteries. The material of the pole 7 includes aluminum, aluminum alloy, copper, nickel, copper-aluminum alloy, and other metal materials.

[0153] The pole 7 is thus arranged, which is not constrained by the size of the cover 2 in the third direction Y, and the size specification of the pole 7 can be flexibly increased according to the overcurrent demand. The pole 7 with a larger size can effectively reduce the current transmission impedance and significantly improve the overcurrent capacity, thereby solving the problem of insufficient overcurrent caused by the small size of the pole 7 in the traditional design due to the size limitation of the cover 2, and providing stable and reliable current transmission protection for high-current scenario devices.

[0154] In some embodiments, it further satisfies: 1

[0155] Preferably, k1 / k2 can be 1.2, 1.5, 1.7, 2, and the like.

[0156] When the range is satisfied, the shape of the pole 7 is reasonable, and the overcurrent capacity can be significantly improved.

[0157] In some embodiments, the minimum distance between the pole 7 and the convex part 4 is p, in mm, and satisfies: 5mm≤p≤50mm.

[0158] If the value of p is too small, the distance between the pole 7 and the convex part 4 is too small, and the risk of short circuit is high, and if the value of p is too large, the size of the pole 7 is too small, which affects the overcurrent capacity of the pole 7.

[0159] When measuring the size p, a general length measuring tool can be used, such as a ruler, a tape measure, etc.

[0160] Specifically, when the convex part 4 is arranged on at least one side of the pole 7 in the second direction X, the minimum distance between the reference edge of the pole 7 in the second direction X close to the corresponding convex part 4 and the corresponding convex part 4 in the second direction X is measured. Or when the convex part 4 is arranged on at least one side of the pole 7 in the third direction Y, the minimum distance between the reference edge of the pole 7 in the third direction Y close to the corresponding convex part 4 and the corresponding convex part 4 in the third direction Y is measured.

[0161] In some embodiments, the thickness of the battery cell 3 is L2, in mm, and satisfies: 12mm≤L2≤40mm, 0.025≤S1 / S2≤0.8.

[0162] Preferably, L2 can be 12, 20, 27, 32, 36, 40, etc., and S1 / S2 can be 0.025, 0.1, 0.38, 0.46, 0.64, 0.77, 0.8, etc.

[0163] The thickness of the battery cell 3 affects the internal active material content and the swelling trend during charging and discharging. When the above range is satisfied, the constraint ability of the convex part 4 on the battery cell 3 is ensured, the stress distribution is optimized, and the local stress concentration phenomenon is avoided.

[0164] In this embodiment, the battery is a square battery.

[0165] When measuring the size L2, a general length measuring tool can be used, such as a ruler, a tape measure, etc.

[0166] Specifically, when measuring L2, the thickness of the battery cell 3 in this embodiment is the size in the third direction Y, the distance between the two surfaces of the battery cell 3 in the third direction Y is measured by a length measuring tool, and the average value is obtained by measuring multiple times to obtain the thickness size L2 of the battery cell 3.

[0167] In some embodiments, the surface of the battery cell 3 has an insulating film with a thickness of t mm, satisfying: 0.03 mm ≤ t ≤ 0.15 mm, 0.005 ≤ S1 / S2 ≤ 1.2.

[0168] Preferably, t can take values of 0.03, 0.06, 0.08, 0.11, 0.14, 0.15, etc., and S1 / S2 can take values of 0.005, 0.1, 0.28, 0.51, 0.69, 0.82, 1.07, 1.2, etc.

[0169] The insulating film can isolate the battery cell 3 from other components, prevent accidental contact between the battery cell 3 and external conductors from causing short circuits, and avoid abnormal current paths within the battery, thereby ensuring normal operation and safe use of the battery.

[0170] The thickness of the insulating film affects the puncture resistance and can withstand greater mechanical stress without being damaged. When the above range is satisfied, the insulating film provides a more stable support foundation and protection buffer, so that the protruding component 4 neither easily causes extrusion damage to the battery cell 3 nor fully plays the role of enhancing the structural strength of the shell 1 and optimizing the internal space layout.

[0171] The cover 2 is provided with a liquid injection channel 21, and the distance between the liquid injection channel 21 and the protruding component 4 in the first direction Z is w, with w in mm, satisfying: w ≤ 30 mm, 0.005 ≤ S1 / S2 ≤ 0.8.

[0172] Preferably, w can take values of 3, 7, 14, 19, 24, 30, etc., and S1 / S2 can take values of 0.005, 0.16, 0.31, 0.49, 0.66, 0.8, etc.

[0173] The liquid injection channel 21 is provided for injecting electrolyte into the interior of the shell 1.

[0174] By limiting the distance between the liquid injection channel 21 and the protruding component 4 in the first direction Z, it can be prevented that the protruding component 4 and the liquid injection channel 21 are too close, and the electrolyte flow is prevented from being affected, so as to improve the infiltration rate of the electrolyte inside the battery and improve the overall cycle life of the battery.

[0175] When measuring w, a common length measuring tool can be used, such as a ruler or a tape measure.

[0176] Specifically, when measuring w, the distance between the liquid injection channel 21 and the protruding component 4 is measured in the first direction Z by a length measuring tool, and the average value is obtained by measuring multiple times.

[0177] In other embodiments, the liquid injection channel 21 can also be arranged on the shell 1, and in specific production implementations, the position of the liquid injection channel 21 can be arranged as required.

[0178] In this embodiment, please refer to Figure 13 The four-prism battery further includes an insulating member 6 arranged between the battery cell 3 and the cover 2, and the insulating member 6 is provided with a through hole 61 corresponding to the position of the liquid injection channel 21.

[0179] The insulating member 6 is used to isolate the battery cell 3 and the cover 2, and insulate the battery cell 3 and the cover 2 to prevent short circuit of the battery. The through hole 61 is arranged to prevent the liquid in the liquid injection channel 21 from being blocked by the insulating member 6, so as to facilitate the electrolyte to infiltrate the battery cell 3 and improve the overall cycle life of the battery.

[0180] When the pressure relief structure 5 is arranged on the cover 2, 0.005≤S1 / S2≤0.7.

[0181] Preferably, S1 / S2 can take values of 0.005, 0.1, 0.22, 0.3, 0.41, 0.55, 0.61, 0.7, etc.

[0182] When the pressure relief structure 5 is arranged on the cover 2, the overall structural strength of the battery can be better, and when the above range is met, the convex member 4 can reduce the occupation of the limited space inside the battery under the premise of ensuring the strength of the shell 1 and the protection performance of the battery cell 3, and provide more diffusion channels for gas and liquid.

[0183] In other embodiments, the pressure relief structure 5 can also be arranged on the shell 1, and specifically, the pressure relief structure 5 can be arranged on the surface of the shell 1 opposite to the cover 2, and the shell 1 and the cover 2 are welded to each other.

[0184] To support the rationality of the above numerical range, this embodiment also conducts micro-short circuit test and battery cycle life test for verification.

[0185] For the battery with the battery cell 3 in the form of laminated sheets, the area of the side surface part 31 is the product of the length and the width of the corresponding side surface of the battery cell 3.

[0186] For the battery with the battery cell 3 in the form of a winding, the battery cell 3 includes a flat section and an arc-shaped section arranged at both ends of the flat section. When the side surface part 31 is the flat section, the area of the side surface part 31 is the product of the length and the width of the flat section, and when the side surface part 31 is the arc-shaped section, the area of the side surface part 31 is the area of the arc surface.

[0187] The specific experimental steps of the micro-short circuit test method are as follows:

[0188] Select the same batch of structural size of the battery assembly, different thickness size of the pole assembly, and different specifications of the shell assembly. Each group of experimental examples and comparative examples is prepared 50 batteries, the batteries are packaged, and after liquid injection, the batteries are charged at room temperature 25℃ with constant current 0.05C current mode. The charging is stopped when the voltage reaches 3.65V. After standing for 1 hour, the batteries are discharged with 1C current, and the discharging is stopped when the voltage reaches 2.7V.

[0189] The battery 15KN is clamped and vibrated, and the room temperature cycle 500CLS is carried out. The self-discharge test is carried out: the battery is charged to full capacity with 1 / 3C current, and then the capacity of the battery is tested after standing at room temperature 25℃ for 7 days. The self-discharge rate of the battery is calculated. The self-discharge is not greater than 10% for qualified.

[0190] The test of battery life cycle is as follows:

[0191] After the lithium ion battery is placed at 45℃ for 120min, the charging and discharging is carried out as follows: 1C constant current constant voltage full charging, cutoff voltage 4.25V, cutoff current 0.33C, standing for 20min, and then 1C constant current discharging to 2.5V. The above charging and discharging is one cycle, and the cycle charging and discharging is carried out. The ratio of the discharge capacity after 1C charging and discharging cycle for 100 cycles to the initial first cycle discharge capacity is taken as the capacity retention rate of the battery after 100 cycles at high temperature. The capacity retention rate is more than 90% for qualified.

[0192] Examples 1-13 and comparative examples 1-4 are verification tests in which only S1, S2, S1 / S2 and H are changed as variables. The specific parameters and results are shown in Table 1.

[0193] Table 1

[0194]

[0195] As shown in Table 1, when 0mm≤H≤5mm and 0.005≤S1 / S2≤1.3 are satisfied, the test results of micro short circuit test and battery cycle life are more ideal, which verifies that reducing the convex part 4 can reduce the damage to the battery cell 3 and ensure the cycle life of the battery.

[0196] The embodiment also provides a power device, which comprises a bottom plate and the above-mentioned quadrangular prism battery. The quadrangular prism battery is fixedly connected to the bottom plate, and the cover body 2 and the bottom plate are arranged in parallel. When the battery is deformed by swelling, such a structure can increase the strength of the shell 1, and at the same time, can reduce the damage of the deformation of the shell 1 to the battery cell 3, and improve the safety of the power device.

[0197] The power device can be a battery pack, a battery pack, an electric vehicle, etc.

[0198] In some embodiments, the cover 2 can be arranged towards the base plate or away from the base plate.

[0199] The above merely describes the preferred embodiments of the present application. It should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A quad rectangular battery, characterized by, Comprising: a housing provided with an opening part on at least one end in a first direction; a cover body covering and closing the opening part; an electric core provided inside the housing; a convex part provided on an inner wall of the housing, the convex part protruding from a surface of the inner wall towards a direction where the electric core is located, the inner wall where the convex part is located being perpendicular to a surface of the cover body, a surface of the electric core opposite to the convex part being a side surface part; Wherein, the distance between the convex part and the side surface part is H, the unit of H is mm, the area of the convex part towards the surface of the battery cell is S1, the unit of S1 is mm 2 , the area of the side surface part is S2, the unit of S2 is mm 2 , and the following conditions are met: 0 mm≤ H≤5mm, 0.005≤S1 / S2≤ 1.

3.

2. The quadrilateral prism battery according to claim 1, characterized by : 0 mm ≤ H ≤ 4.5 mm, 0.008 ≤ S1 / S2 ≤ 1.

2.

3. The quadrilateral prism battery according to claim 1, characterized by : The housing comprises two oppositely arranged first side surfaces and two oppositely arranged second side surfaces, an area of the first side surface is greater than an area of the second side surface, and the first side surface and the second side surface are both perpendicular to a surface of the cover body.

4. The quadrilateral prism battery according to claim 3, characterized by : The convex part is provided on the first side surface, and further satisfies: 0.008 ≤ S1 / S2 ≤ 0.

8.

5. The quadrilateral prism battery according to claim 4, characterized by : The convex part is provided on the first side surface on one side of the electric core, and further satisfies: 0.025 ≤ S1 / S2 ≤ 0.

8.

6. The quadrilateral prism battery according to claim 4, characterized by : The convex part is provided on the first side surface on opposite sides of the electric core, and further satisfies: 0.05 ≤ S1 / S2 ≤ 0.

8.

7. The quadralateral prismatic battery of claim 6, wherein : The convex part comprises a first convex part and a second convex part, the first convex part and the second convex part are respectively located on opposite sides of the electric core, and the first convex part and the second convex part at least partially coincide in orthographic projection on the same first side surface.

8. The quadrilateral prism battery according to claim 6, characterized by : The convex part comprises a first convex part and a second convex part, the first convex part and the second convex part are respectively located on opposite sides of the electric core, and the first convex part and the second convex part are spaced from each other in orthographic projection on the same first side surface.

9. The quadrilateral prism battery according to claim 3, characterized by : The convex part is provided on the second side surface, and further satisfies: 0.02 ≤ S1 / S2 ≤ 1.

2.

10. The quadralateral prismatic battery of claim 9, wherein : The convex part is provided on the second side surface on one side of the electric core, and further satisfies: 0.025 ≤ S1 / S2 ≤ 0.

8.

11. The quadralateral prismatic battery of claim 9, wherein : The convex part is provided on the second side surface on opposite sides of the electric core, and further satisfies: 0.05 ≤ S1 / S2 ≤ 0.

8.

12. The quadralateral prismatic battery of claim 11, wherein : The convex part comprises a third convex part and a fourth convex part, the third convex part and the fourth convex part are respectively located on opposite sides of the electric core, and the third convex part and the fourth convex part at least partially coincide in orthographic projection on the same second side surface.

13. The quadralateral prismatic battery of claim 11, wherein : The convex part comprises a third convex part and a fourth convex part, the third convex part and the fourth convex part are respectively located on opposite sides of the electric core, and the third convex part and the fourth convex part are spaced from each other in orthographic projection on the same second side surface.

14. The quadrilateral prismatic battery of claim 1, wherein : One end of the convex part in the first direction extends to the opening part.

15. The quadralateral prismatic battery of claim 14, wherein : Both ends of the convex part in the first direction extend to the opening part at both ends of the housing in the first direction.

16. The quadralateral prismatic battery of claim 14, wherein : The convex part is welded with the cover body, and further satisfies: 0.008 ≤ S1 / S2 ≤ 1.

25.

17. The quadrilateral prismatic battery of claim 1, wherein : A minimum distance between one end of each of the convex components close to the opening portion in the first direction and the opening portion is d1, the unit of d1 is mm, a size of the shell in the first direction is D1, the unit of D1 is mm, and d1 / D1≥1 / 5 and 0.008≤S1 / S2≤1.2 are satisfied.

18. The quadrilateral prismatic battery of claim 1, wherein , and further satisfy: 100mm²≤S1≤1500mm², and 1000mm²≤S2≤30000mm².

19. The quadrilateral prismatic battery of claim 3, wherein : The first direction and the second direction jointly form the first side surface, and the second direction intersects the first direction; The convex components are arranged on the first side surface, and a minimum distance between one end of each of the convex components in the second direction and the second side surface close to the one end is d2, the unit of d2 is mm, a size of the first side surface in the second direction is D2, the unit of D2 is mm, and d2 / D2≥1 / 3 is satisfied.

20. The quadrilateral prismatic battery of claim 3, wherein : The number of the convex components is multiple, and the convex components are arranged on the first side surface or the second side surface, and two adjacent convex components are spaced apart from each other.

21. The quadrilateral prismatic battery of claim 3, wherein : The number of the convex components is one, and the convex component is arranged on the inner wall of the first side surface and the second side surface at the same time, and further satisfy: 0.05≤S1 / S2≤1.

2.

22. The quadrilateral prismatic battery of claim 1, wherein : The volume of the convex part is V1, the unit of V1 is mm 3 The internal volume of the shell is V2, the unit of V2 is mm 3 Satisfies: 8*10 -6 ≤V1 / V2≤0.

024.

23. The quadrilateral prismatic battery of claim 1, wherein, Further comprising: A pressure relief structure arranged on the cover body or the shell; A minimum distance between a projection edge of the convex component on the cover body and an edge of the pressure relief structure is h, the unit of h is mm, and 5mm≤h≤130mm is satisfied.

24. The quadrangular prism battery of claim 1, wherein: A minimum distance between one end of the convex component in the first direction and the cover body is L1, the unit of L1 is mm, and 0mm≤L1≤10mm is satisfied.

25. The quadrangular prism battery of claim 1, wherein: The convex component is integrally formed with the shell.

26. The quadrilateral prismatic battery of claim 1, wherein, Further comprising: The electrode post is non-rectangular in shape. Its dimension in the second direction is k1 (in mm), and its dimension in the third direction is k2 (in mm), satisfying: k1 > k 2； The first direction, the second direction and the third direction intersect each other.

27. The quadrilateral prismatic battery of claim 26, wherein, Further satisfy: 1 28. The quadrangular prism battery of claim 26, wherein: A minimum distance between the convex component and the pole in the second direction is p, the unit of p is mm, and 5mm≤p≤50mm is satisfied.

29. The quadrangular prism battery of claim 1, wherein: A thickness size of the battery cell is L2, the unit of L2 is mm, and 12mm≤L2≤40mm and 0.025≤S1 / S2≤0.8 are satisfied.

30. The quadrangular prism battery of claim 1, wherein: The battery cell surface has an insulating film, a thickness of the insulating film is t, the unit of t is mm, and 0.03mm≤t≤0.15mm and 0.005≤S1 / S2≤1.2 are satisfied.

31. The quadrangular prism battery of any one of claims 1-30, wherein: The cover is provided with a liquid injection channel, the distance between the convex part and the liquid injection channel in the first direction is w, the unit of w is mm, and w satisfies: w ≤ 30 mm, 0.005 ≤ S1 / S2 ≤ 0.

8.

32. An electrical device, comprising: The application further provides a battery pack comprising a bottom plate and the quadrangular prism battery as claimed in any one of claims 1-31, the quadrangular prism battery being fixedly connected to the bottom plate, and the cover and the bottom plate being arranged in parallel.

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