Quadrangular prism type battery

Abstract

The utility model relates to the technical field of batteries, and provides a quadrangular-prism-shaped battery, which comprises a battery shell structure which comprises steel and is provided with a pole through hole; the battery cell is arranged in the battery shell structure; the pole column assembly is arranged in the pole column through hole in a penetrating manner, is fixed on the battery shell structure and is electrically connected with the battery cell; wherein the pole assembly is provided with a first surface deviating from the battery cell and a second surface close to the battery cell, and the ratio of the area enclosed by the circumferential outer edge of the first surface to the area enclosed by the circumferential outer edge of the second surface is 0.2-1.8, so that the stress balance of the pole assembly can be controlled, and the damage risk of the battery shell structure is further reduced; therefore, the safe use performance of the quadrangular prism type battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a quadrangular prism battery. Background Art

[0002] In the related art, a pole assembly may be provided on the battery shell structure, and the pole assembly may be fixedly connected to the battery shell structure. The material of the battery shell structure may be steel or aluminum. The steel shell is harder than the aluminum shell, and the elasticity of the steel shell is poor. Therefore, once the pole assembly is subjected to uneven force, resulting in stress concentration, the force is quickly transferred to the battery shell structure, causing the battery shell structure to deform and fail. Utility Model Content

[0003] The utility model provides a quadrangular prism type battery to improve the use performance of the quadrangular prism type battery.

[0004] The utility model provides a quadrangular prism battery, comprising:

[0005] A battery shell structure, the battery shell structure comprises steel, and a pole through hole is arranged on the battery shell structure;

[0006] A battery cell, wherein the battery cell is disposed in the battery housing structure;

[0007] A pole assembly, the pole assembly is inserted into the pole through hole and fixed on the battery shell structure, and the pole assembly is electrically connected to the battery cell;

[0008] The pole assembly has a first surface facing away from the battery cell and a second surface close to the battery cell, and the ratio of an area S1 enclosed by a circumferential outer edge of the first surface to an area S2 enclosed by a circumferential outer edge of the second surface is 0.2-1.8.

[0009] The quadrangular prism type battery of the embodiment of the utility model comprises a battery shell structure, a battery cell and a pole assembly, the battery cell is arranged in the battery shell structure, the pole assembly is fixed on the battery shell structure, and the pole assembly is electrically connected to the battery cell. The pole assembly has a first surface away from the battery cell and a second surface close to the battery cell. Considering that the battery shell structure comprises steel, when the ratio of the area enclosed by the circumferential outer edge of the first surface to the area enclosed by the circumferential outer edge of the second surface is too large or too small, when the first surface or the second surface of the pole assembly is subjected to force, due to the large hardness and poor elasticity of steel, once the pole assembly is subjected to uneven force, stress concentration is caused, and the force is quickly transmitted to the battery shell structure, causing the battery shell structure to deform and fail. Therefore, by making the ratio of the area enclosed by the circumferential outer edge of the first surface to the area enclosed by the circumferential outer edge of the second surface be 0.2-1.8, the force balance of the pole assembly can be controlled, thereby reducing the risk of damage to the battery shell structure, thereby improving the safe use performance of the quadrangular prism type battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0013] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

[0014] Figure 4 is a schematic diagram of a partial cross-sectional structure of a battery according to a third exemplary embodiment;

[0015] Figure 5 is a schematic cross-sectional structure diagram of a battery pole assembly according to an exemplary embodiment;

[0016] Figure 6 is a schematic cross-sectional structure diagram of a battery pole assembly according to another exemplary embodiment;

[0017] Figure 7 is based on Figure 2 A schematic structural diagram of a pole assembly from one perspective shown in an exemplary embodiment;

[0018] Figure 8 is based on Figure 2 A schematic structural diagram of a pole assembly from another perspective is shown in an exemplary embodiment.

[0019] The following are the descriptions of the reference numerals:

[0020] 10. Battery shell structure; 11. Pole through hole; 12. Outer surface; 13. Inner surface; 20. Battery cell; 30. Pole assembly; 31. First surface; 32. Second surface; 33. Main body; 34. Limiting section; 35. Flanging riveting section; 36. First part; 37. Second part; 38. Riveting section; 39. Pole section; 391. First metal part; 392. Second metal part; 40. Insulating part. DETAILED DESCRIPTION

[0021] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0022] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0023] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0024] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0025] An embodiment of the utility model provides a quadrangular prism battery, please refer to Figures 1 to 8 The quadrangular prism battery includes: a battery shell structure 10, the battery shell structure 10 includes steel, and a pole through hole 11 is arranged on the battery shell structure 10; a battery cell 20, the battery cell 20 is arranged in the battery shell structure 10; a pole assembly 30, the pole assembly 30 is passed through the pole through hole 11 and fixed on the battery shell structure 10, and the pole assembly 30 is electrically connected to the battery cell 20; wherein the pole assembly 30 has a first surface 31 away from the battery cell 20 and a second surface 32 close to the battery cell 20, and the ratio of the area S1 enclosed by the circumferential outer edge of the first surface 31 to the area S2 enclosed by the circumferential outer edge of the second surface 32 is 0.2-1.8.

[0026] A quadrangular prism battery according to an embodiment of the present invention comprises a battery casing structure 10 , a battery cell 20 and a pole assembly 30 . The battery cell 20 is disposed in the battery casing structure 10 , the pole assembly 30 is fixed on the battery casing structure 10 , and the pole assembly 30 is electrically connected to the battery cell 20 . The pole assembly 30 has a first surface 31 facing away from the battery cell 20 and a second surface 32 close to the battery cell 20. Considering that the battery casing structure 10 includes steel, when the ratio of the area enclosed by the circumferential outer edge of the first surface 31 to the area enclosed by the circumferential outer edge of the second surface 32 is too large or too small, when the first surface 31 or the second surface 32 of the pole assembly 30 is subjected to force, due to the high hardness and poor elasticity of steel, once the pole assembly 30 is subjected to uneven force, resulting in stress concentration, the force is quickly transferred to the battery casing structure 10, causing the battery casing structure 10 to deform and fail. Therefore, by making the ratio of the area enclosed by the circumferential outer edge of the first surface 31 to the area enclosed by the circumferential outer edge of the second surface 32 be 0.2-1.8, the force balance of the pole assembly 30 can be controlled, thereby reducing the risk of damage to the battery casing structure 10, thereby improving the safe use performance of the quadrangular prism battery.

[0027] It should be noted that the battery housing structure 10 includes steel. The battery housing structure 10 may include pure steel, carbon steel, nickel-plated steel, etc. The steel may include martensitic steel, austenitic steel, etc., which is not limited here.

[0028] The battery includes a cell 20 and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. The cell 20 refers to a unit formed by winding or laminating a stacked portion, which includes a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with active materials.

[0029] The quadrangular prism type battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0030] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, and the battery cell 20 has a first pole piece stacked on each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell. The diaphragm sheet can be a diaphragm.

[0031] Alternatively, the battery may be a wound battery, that is, a first pole piece, a second pole piece having electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell. The diaphragm sheet may be a diaphragm.

[0032] Combination Figure 1 As shown, the battery housing structure 10 may be provided with a pole assembly 30, and there may be two pole assemblies 30, which may be a positive pole assembly and a negative pole assembly respectively. Figure 2 As shown, the battery cell 20 can be disposed in the battery housing structure 10, and the battery cell 20 can include a positive electrode tab and a negative electrode tab, and the positive electrode tab and the negative electrode tab can be electrically connected to the positive electrode column assembly and the negative electrode column assembly respectively.

[0033] The pole assembly 30 does not include an electrical connection sheet for connecting the pole assembly 30 and the pole ear of the battery cell 20, nor does the pole assembly 30 include a busbar for electrically connecting at least two batteries. The pole assembly here only includes Figures 1 to 8 The structure shown in FIG. 1 is penetrated through the battery housing structure 10 .

[0034] Combination Figure 2 and Figure 3 As shown, the pole assembly 30 has a first surface 31 away from the battery cell 20 and a second surface 32 close to the battery cell 20 , that is, the first surface 31 and the second surface 32 may be the top end surface and the bottom end surface of the pole assembly 30 , respectively.

[0035] The area enclosed by the circumferential outer edge of the first surface 31 is the area enclosed by the circumferential outer edge of the positive projection of the first surface 31 on the battery housing structure 10. For example, the first surface 31 may be a circular surface, and the area enclosed by the circumferential outer edge of the first surface 31 is the area enclosed by the outermost circle of the circular surface. Alternatively, the first surface 31 may be a rectangular surface, and the rectangular surface may have a through hole inside, then the area enclosed by the circumferential outer edge of the first surface 31 is the area enclosed by the outermost circle of the rectangular surface.

[0036] The area enclosed by the circumferential outer edge of the second surface 32 is the area enclosed by the circumferential outer edge of the positive projection of the second surface 32 on the battery housing structure 10. For example, the second surface 32 can be a circular surface, and the area enclosed by the circumferential outer edge of the second surface 32 is the area of ​​the circular surface; or, the second surface 32 can be a rectangular surface, and the area enclosed by the circumferential outer edge of the second surface 32 is the area of ​​the rectangular surface.

[0037] Combination Figure 7 and Figure 8 As shown, the area enclosed by the circumferential outer edge of the first surface 31 can be expressed as S1, and the area enclosed by the circumferential outer edge of the second surface 32 can be expressed as S2.

[0038] The ratio of the area S1 enclosed by the circumferential outer edge of the first surface 31 to the area S2 enclosed by the circumferential outer edge of the second surface 32 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75 or 1.8, etc.

[0039] In one embodiment, the ratio of the area S1 enclosed by the circumferential outer edge of the first surface 31 to the area S2 enclosed by the circumferential outer edge of the second surface 32 is 1-1.8, which can not only control the force balance of the pole assembly 30 and reduce the risk of damage to the battery casing structure 10, but also facilitate the heat transfer inside the battery to avoid excessive heat concentration, thereby improving the safe use performance of the battery.

[0040] In one embodiment, the electrode assembly 30 can be fixed by a flange on the battery housing structure 10 .

[0041] In one embodiment, the pole assembly 30 is riveted to the battery housing structure 10 , that is, the pole assembly 30 itself has a riveting process, thereby ensuring the structural strength of the pole assembly 30 , reducing the probability of damage to the pole assembly 30 , and ensuring the fixing performance of the pole assembly 30 .

[0042] Among them, the ratio of the area of ​​the first surface 31 to the area of ​​the second surface 32 is 0.2-0.7, that is, the area of ​​the first surface 31 can be smaller than the area of ​​the second surface 32, thereby ensuring the structural strength of the pole assembly 30 and the fixing strength to the battery housing structure 10.

[0043] The area of ​​the first surface 31 refers to the area of ​​the positive projection of the first surface 31 on the battery casing structure 10. For example, the first surface 31 may be a toroidal surface, and the area of ​​the first surface 31 is the difference between the area enclosed by the outermost circle of the toroidal surface and the area enclosed by the inner circle of the toroidal surface. Alternatively, the first surface 31 may be a rectangular surface, and the rectangular surface may have a through hole inside. In this case, the area of ​​the first surface 31 is the area enclosed by the outermost circle of the rectangular surface minus the area of ​​the through hole.

[0044] The area of ​​the second surface 32 refers to the area of ​​the positive projection of the second surface 32 on the battery housing structure 10. For example, the second surface 32 can be a circular surface, and the area enclosed by the circumferential outer edge of the second surface 32 is the area of ​​the circular surface; or, the second surface 32 can be a rectangular surface, and the area enclosed by the circumferential outer edge of the second surface 32 is the area of ​​the rectangular surface.

[0045] In one embodiment, Figure 2 As shown, the pole assembly 30 includes a main body 33, a limiting section 34 and a flanged riveted section 35. The main body 33 is inserted into the pole through hole 11, the limiting section 34 is connected to one end of the main body 33 close to the battery cell 20, and the flanged riveted section 35 is connected to the other end of the main body 33 away from the battery cell 20. The limiting section 34 and the flanged riveted section 35 are clamped and fixed on the battery shell structure 10, thereby ensuring that the pole assembly 30 can be stably fixed on the battery shell structure 10, and the existence of the flanged riveted section 35 can also improve the assembly efficiency of the pole assembly 30.

[0046] During the installation process of the pole assembly 30, the pole assembly 30 can be passed through the pole through hole 11. At this time, the limiting section 34 forms a limit for the pole assembly 30, and then the flanging riveting section 35 can be formed by the riveting and flanging process, so that the pole assembly 30 is clamped and fixed on the battery shell structure 10 through the limiting section 34 and the flanging riveting section 35.

[0047] Among them, the ratio of the area of ​​the first surface 31 to the area of ​​the second surface 32 is 0.3-0.7, that is, the ratio of the end face of the flanged riveted section 35 away from the main body 33 to the end face of the limiting section 34 away from the main body 33 is 0.3-0.7, that is, the end face area of ​​the flanged riveted section 35 away from the main body 33 can be appropriately increased to avoid the risk of breakage of the pole assembly 30 due to excessive force.

[0048] When the pole assembly 30 is fixed to the battery housing structure 10 by the flanging riveting process, the force it is subjected to is relatively small, and the pole assembly 30 needs to be gradually thinned and fixed, so the end surface area of ​​the flanging riveting section 35 is increased to prevent the pole assembly 30 from being subjected to excessive force and breaking.

[0049] The pole assembly 30 includes a main body 33 , a limiting section 34 and a flanging riveting section 35 . The main body 33 , the limiting section 34 and the flanging riveting section 35 are an integrated structure.

[0050] In one embodiment, Figure 3 As shown, the pole assembly 30 includes a riveted section 38 and a pole section 39, which are riveted together. The riveted section 38 is located on the side of the pole section 39 away from the battery cell 20, and the pole section 39 is inserted into the pole through hole 11. The pole section 39 is electrically connected to the battery cell 20, thereby ensuring a quick connection between the riveted section 38 and the pole section 39, thereby improving the manufacturing efficiency of the battery. In addition, the riveted connection between the riveted section 38 and the pole section 39 can avoid the problems of breakage and poor stability that are prone to occur in welding connections.

[0051] The materials of the riveted section 38 and the pole section 39 may be consistent. For example, the materials of the riveted section 38 and the pole section 39 may both be aluminum, or the material of the riveted section 38 may be aluminum, and the material of the pole section 39 may be copper.

[0052] Among them, the battery shell structure 10 is clamped between the riveted section 38 and the pole section 39, and the ratio of the area of ​​the first surface 31 to the area of ​​the second surface 32 is 0.2-0.5, that is, the ratio of the end surface area of ​​the riveted section 38 away from the battery cell 20 to the end surface area of ​​the pole section 39 close to the battery cell 20 is 0.2-0.5, thereby ensuring that the pole assembly 30 can be reliably fixed on the battery shell structure 10 and reducing the risk of damaging the battery shell structure 10.

[0053] The riveted pole assembly 30 requires a large force to be fixed on the battery casing structure 10. By controlling the ratio of the area of ​​the first surface 31 to the area of ​​the second surface 32, the pole assembly 30 and the battery casing structure 10 can be tightly assembled, and the current carrying capacity of the pole assembly 30 itself can also be guaranteed, thereby improving the safe use performance of the battery.

[0054] In one embodiment, the distance between the first surface 31 and the second surface 32 is D, the wall thickness of the end face of the battery housing structure 10 provided with the pole through hole 11 is d, and D / d is 3-100. On the basis of ensuring the structural strength of the pole assembly 30, the structural strength and pressure bearing capacity of the battery housing structure 10 itself can also be ensured, thereby improving the safe use performance of the battery.

[0055] Combination Figure 4 As shown, the distance between the first surface 31 and the second surface 32 can be expressed as D, that is, the overall height of the pole assembly 30 can be expressed as D, and the wall thickness of the end surface of the battery housing structure 10 provided with the pole through hole 11 can be expressed as d. The ratio of the distance D between the first surface 31 and the second surface 32 to the wall thickness d of the end surface of the battery housing structure 10 provided with the pole through hole 11 can be 3, 3.5, 4, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 22, 25, 28, 30, 32, 35, 38, 40, 42, 45, 48, 50, 52, 55, 58, 60, 62, 65, 68, 70, 72, 75, 78, 80, 82, 85, 88, 90, 92, 95, 98 or 100, etc.

[0056] The ratio of the distance D between the first surface 31 and the second surface 32 to the wall thickness d of the end face of the battery shell structure 10 where the pole through hole 11 is provided is too small, the overall strength of the pole assembly 30 is relatively weak, and the force of the pole assembly 30 is quickly transmitted to the battery shell structure 10, resulting in an increased risk of deformation and fracture of the battery shell structure 10; the ratio of the distance D between the first surface 31 and the second surface 32 to the wall thickness d of the end face of the battery shell structure 10 where the pole through hole 11 is provided is too large, and the pressure bearing capacity of the battery shell structure 10 is weak, which is not conducive to ensuring the safe use performance of the battery.

[0057] In one embodiment, Figure 4 As shown, the portion of the battery shell structure 10 provided with the pole through hole 11 includes an outer surface 12 and an inner surface 13, and the pole assembly 30 includes a first portion 36 protruding from the outer surface 12 and a second portion 37 protruding from the inner surface 13, and the ratio of the thickness d1 of the first portion 36 to the thickness d2 of the second portion 37 is 0.3-3, so that the thickness dimension of the pole assembly 30 located on the inner and outer sides of the battery shell structure 10 can be controlled, thereby ensuring that the battery shell structure 10 can be subjected to relatively balanced forces, reducing the probability of the pole assembly 30 causing damage to the battery shell structure 10, and also ensuring the current carrying capacity of the pole assembly 30 itself.

[0058] The portion of the battery shell structure 10 provided with the pole through hole 11 includes an outer surface 12 and an inner surface 13 . The outer surface 12 is the side of the battery shell structure 10 facing away from the battery cell 20 , and the inner surface 13 is the other side of the battery shell structure 10 facing the battery cell 20 .

[0059] Combination Figure 4 As shown, the thickness of the first portion 36 can be expressed as d1, and the thickness of the second portion 37 can be expressed as d2. The ratio of the thickness d1 of the first portion 36 to the thickness d2 of the second portion 37 can be 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3, etc.

[0060] In one embodiment, Figure 5 and Figure 6As shown, the pole assembly 30 is a composite metal structure, and the pole assembly 30 includes a first metal part 391 and a second metal part 392 connected to each other. The elastic modulus of the first metal part 391 is smaller than the elastic modulus of the second metal part 392, and the second metal part 392 is arranged closer to the battery cell 20 than the first metal part 391; wherein, along the direction in which the pole through hole 11 passes through the battery casing structure 10, the ratio of the maximum thickness h1 of the first metal part 391 to the maximum thickness h2 of the second metal part 392 is 0.1-5, which can not only ensure the structural strength of the pole assembly 30 and reduce the risk of damage to the pole assembly 30, but also facilitate the pole assembly 30 to form a connection with the battery cell 20 and the bus.

[0061] The first metal member 391 may be an aluminum member, and the second metal member 392 may be a copper member.

[0062] Combination Figure 5 and Figure 6 As shown, the maximum thickness of the first metal part 391 can be expressed as h1, and the maximum thickness of the second metal part 392 can be expressed as h2. If the ratio of the maximum thickness h1 of the first metal part 391 to the maximum thickness h2 of the second metal part 392 is too small, the top strength of the pole assembly 30 is weak and the risk of deformation is greater, and the external battery exerts a greater pulling force on the top of the pole assembly 30; if the ratio of the maximum thickness h1 of the first metal part 391 to the maximum thickness h2 of the second metal part 392 is too large, the second metal part 392 is likely to transfer force to the tab of the battery cell 20, and the tab has poor anti-deformation ability, is prone to tearing, and generates more metal chips, thereby affecting the safety performance of the battery.

[0063] The ratio of the maximum thickness h1 of the first metal part 391 to the maximum thickness h2 of the second metal part 392 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.2, 3.3, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.6, 4.8, 4.9 or 5, etc.

[0064] In one embodiment, the wall thickness of the battery housing structure 10 is 0.05 mm-0.45 mm. On the basis of ensuring the structural strength of the battery housing structure 10, it is also possible to avoid the wall thickness of the battery housing structure 10 being too large to affect the overall energy density of the battery.

[0065] The wall thickness of the battery housing structure 10 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.12mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.22mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.29mm, 0.3mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm, 0.39mm, 0.4mm, 0.42mm, 0.44mm or 0.45mm, etc.

[0066] In one embodiment, the battery shell structure 10 can be a steel shell, which can not only ensure the overall structural strength of the battery shell structure 10, but also reduce the corrosion risk of the battery shell structure 10, thereby improving the safety performance of the quadrangular prism battery.

[0067] In one embodiment, the length of the battery housing structure 10 is ≤ 650 mm, thereby controlling the probability of the pole assembly 30 causing damage to the battery housing structure 10, thereby ensuring the safe use performance of the battery.

[0068] The length of the battery housing structure 10 may be 650 mm, 640 mm, 630 mm, 620 mm, 610 mm, 600 mm, 550 mm or 500 mm, etc.

[0069] In one embodiment, the tensile strength of the battery housing structure 10 is 600 MPa-1500 MPa, thereby ensuring that the battery housing structure 10 has reliable structural strength and reducing the risk of the electrode assembly 30 causing damage to the battery housing structure 10 .

[0070] The tensile strength of the battery housing structure 10 can be 600MPa, 620MPa, 650MPa, 680MPa, 700MPa, 720MPa, 750MPa, 780MPa, 800MPa, 820MPa, 850MPa, 880MPa, 900MPa, 920MPa, 950MPa, 980MPa, 1000MPa, 1020MPa, 1050MPa. Pa, 1080MPa, 1100MPa, 1120MPa, 1150MPa, 1180MPa, 1200MPa, 1220MPa, 1250MPa, 1280MPa, 1300MPa, 1320MPa, 1350MPa, 1380MPa, 1400MPa, 1420MPa, 1450MPa, 1480MPa or 1500MPa, etc.

[0071] In one embodiment, Figure 2 As shown, the quadrangular prism-type battery also includes an insulating member 40, which is arranged between the battery shell structure 10 and the pole assembly 30. The portion of the battery shell structure 10 provided with the pole through hole 11 includes an outer surface 12 and an inner surface 13, wherein at least a portion of the insulating member 40 is located between the outer surface 12 and the pole assembly 30, and the elastic modulus of the insulating member 40 is 1MPa-3000MPa, and / or, at least a portion of the insulating member 40 is located between the inner surface 13 and the pole assembly 30, and the elastic modulus of the insulating member 40 is 1MPa-2800MPa. On the basis of enabling the insulating member 40 to form insulation protection for the pole assembly 30 and the battery shell structure 10, the insulating member 40 can also ensure the fixing strength between the pole assembly 30 and the battery shell structure 10, and at the same time achieve buffering of the battery shell structure 10 to avoid deformation of the battery shell structure 10, thereby ensuring the safe use performance of the battery.

[0072] The insulating member 40 may be a rubber structure, and the insulating member 40 may be an integrally formed structure, for example, the insulating member 40 may be integrally formed between the pole assembly 30 and the battery housing structure 10. Alternatively, the insulating member 40 may be a split structure.

[0073] The elastic modulus of the insulating member 40 may be 1 MPa, 10 MPa, 20 MPa, 30 MPa, 40 MPa, 50 MPa, 80 MPa, 100 MPa, 120 MPa, 130 MPa, 140 MPa, 150 MPa, 180 MPa, 200 MPa, 250 MPa, 300 MPa, 350 MPa, 380 MPa, 400 MPa, 450 MPa, 500 MPa, 550 MPa, 600 MPa, 650 MPa, 700 MPa, 750 MPa, 800 MPa. The abovementioned material may be used in the range of 1000 MPa to 2500 MPa, 2600 MPa, 2700 MPa, 2800 MPa, 2900 MPa or 3000 MPa, etc. The abovementioned material may be used in the range of 1000 MPa to 2500 MPa, 2600 MPa, 2700 MPa, 2800 MPa, 2900 MPa or 3000 MPa, etc.

[0074] In one embodiment, the thermal conductivity of the insulating member 40 is ≥10 W / (m·K), so as to avoid the situation where the pole assembly 30 is overheated and the stability of the insulating member 40 is affected, thereby reducing the insulation and sealing performance of the insulating member 40 .

[0075] The thermal conductivity of the insulating member 40 may be 10 W / (m·K), 15 W / (m·K), 20 W / (m·K), 25 W / (m·K), 30 W / (m·K), 35 W / (m·K), 40 W / (m·K) or 50 W / (m·K), etc.

[0076] An embodiment of the present invention further provides a battery pack, which includes quadrangular prism-shaped batteries.

[0077] A battery pack of an embodiment of the utility model includes a quadrangular prism-shaped battery including a battery shell structure 10 , a battery cell 20 and a pole assembly 30 . The battery cell 20 is disposed in the battery shell structure 10 , the pole assembly 30 is fixed on the battery shell structure 10 , and the pole assembly 30 is electrically connected to the battery cell 20 . The pole assembly 30 has a first surface 31 facing away from the battery cell 20 and a second surface 32 close to the battery cell 20. Considering that the battery casing structure 10 includes steel, when the ratio of the area enclosed by the circumferential outer edge of the first surface 31 to the area enclosed by the circumferential outer edge of the second surface 32 is too large or too small, when the first surface 31 or the second surface 32 of the pole assembly 30 is subjected to force, due to the high hardness and poor elasticity of steel, once the pole assembly 30 is subjected to uneven force, resulting in stress concentration, the force is quickly transferred to the battery casing structure 10, causing the battery casing structure 10 to deform and fail. Therefore, by making the ratio of the area enclosed by the circumferential outer edge of the first surface 31 to the area enclosed by the circumferential outer edge of the second surface 32 be 0.2-1.8, the force balance of the pole assembly 30 can be controlled, thereby reducing the risk of damage to the battery casing structure 10, thereby improving the safe use performance of the battery pack.

[0078] In one embodiment, the battery pack is a battery module or a battery pack.

[0079] The battery module includes a plurality of quadrangular prism-shaped batteries. The battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of quadrangular prism-shaped batteries.

[0080] It should be noted that a plurality of quadrangular prism-shaped batteries can be formed into a battery module and then arranged in a battery box, and the plurality of quadrangular prism-shaped batteries can be fixed by end plates and side plates. A plurality of quadrangular prism-shaped batteries can be directly arranged in a battery box, that is, there is no need to group the plurality of quadrangular prism-shaped batteries, in which case the end plates and side plates can be removed.

[0081] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0082] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A quadrangular prism battery, characterized in that: include: A battery housing structure (10), the battery housing structure (10) comprising steel, and a pole through hole (11) being provided on the battery housing structure (10); A battery cell (20), wherein the battery cell (20) is arranged in the battery casing structure (10); A pole assembly (30), the pole assembly (30) being inserted into the pole through hole (11) and fixed on the battery housing structure (10), the pole assembly (30) being electrically connected to the battery cell (20); The pole assembly (30) has a first surface (31) facing away from the battery cell (20) and a second surface (32) close to the battery cell (20), and a ratio of an area S1 enclosed by a circumferential outer edge of the first surface (31) to an area S2 enclosed by a circumferential outer edge of the second surface (32) is 0.2-1.

8.

2. The quadrangular prism battery according to claim 1, characterized in that: The ratio of the area S1 enclosed by the circumferential outer edge of the first surface (31) to the area S2 enclosed by the circumferential outer edge of the second surface (32) is 1-1.

8.

3. The quadrangular prism battery according to claim 1, characterized in that: The pole assembly (30) is riveted and fixed to the battery housing structure (10); Wherein, the ratio of the area of ​​the first surface (31) to the area of ​​the second surface (32) is 0.2-0.

7.

4. The quadrangular prism battery according to claim 3, characterized in that: The pole assembly (30) comprises a main body (33), a limiting section (34) and a flanging riveting section (35); the main body (33) is inserted into the pole through hole (11); the limiting section (34) is connected to one end of the main body (33) close to the battery cell (20); the flanging riveting section (35) is connected to the other end of the main body (33) away from the battery cell (20); the limiting section (34) and the flanging riveting section (35) are clamped and fixed on the battery housing structure (10); Wherein, the ratio of the area of ​​the first surface (31) to the area of ​​the second surface (32) is 0.3-0.

7.

5. The quadrangular prism battery according to claim 1, characterized in that: The distance between the first surface (31) and the second surface (32) is D, the wall thickness of the end surface of the battery housing structure (10) provided with the pole through hole (11) is d, and D / d is 3-100.

6. The quadrangular prism battery according to claim 1, characterized in that: The portion of the battery housing structure (10) provided with the pole through hole (11) includes an outer surface (12) and an inner surface (13); the pole assembly (30) includes a first portion (36) protruding from the outer surface (12) and a second portion (37) protruding from the inner surface (13); the ratio of the thickness d1 of the first portion (36) to the thickness d2 of the second portion (37) is 0.3-3.

7. The quadrangular prism battery according to claim 1, characterized in that: The pole assembly (30) is a composite metal structure, comprising a first metal member (391) and a second metal member (392) connected to each other, the elastic modulus of the first metal member (391) being smaller than the elastic modulus of the second metal member (392), and the second metal member (392) being arranged closer to the battery core (20) than the first metal member (391); Wherein, along the direction in which the pole through hole (11) passes through the battery housing structure (10), the ratio of the maximum thickness h1 of the first metal part (391) to the maximum thickness h2 of the second metal part (392) is 0.1-5.

8. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The wall thickness of the battery shell structure (10) is 0.05 mm-0.45 mm, and / or the length of the battery shell structure (10) is ≤650 mm, and / or the tensile strength of the battery shell structure (10) is 600 MPa-1500 MPa.

9. The quadrangular prism battery according to any one of claims 1 to 7, characterized in that: The quadrangular prism-type battery further comprises an insulating member (40), wherein the insulating member (40) is arranged between the battery housing structure (10) and the pole assembly (30), and the portion of the battery housing structure (10) where the pole through hole (11) is arranged comprises an outer surface (12) and an inner surface (13), Wherein, at least a portion of the insulating member (40) is located between the outer surface (12) and the pole assembly (30), and the elastic modulus of the insulating member (40) is 1 MPa-3000 MPa, and / or, at least a portion of the insulating member (40) is located between the inner surface (13) and the pole assembly (30), and the elastic modulus of the insulating member (40) is 1 MPa-2800 MPa.

10. The quadrangular prism battery according to claim 9, characterized in that: The thermal conductivity of the insulating member (40) is ≥10 W / (m·K).

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