Prismatic cells and battery packs

Abstract

The present invention relates to the field of battery technology and provides a prismatic battery and battery pack. The prismatic battery includes a battery housing, which includes a main body and a protruding portion. The protruding portion extends from the main body in the longitudinal direction. The main body and the protruding portion form a large surface of the battery housing. Along the width direction of the main body, the ratio of the length dimension of the protruding portion to the width dimension of the main body is 0.3-0.8. That is, the size of the protruding portion can be relatively small, that is, the protruding portion can serve as a load-bearing area for the battery end, and the protruding portion can form an avoidance to avoid interference problems during installation. It also creates space for the installation of other structures, thereby reliably improving the safe use performance of the prismatic battery.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a prismatic battery and a battery pack. Background Art

[0002] In the related art, when batteries are used in groups, the battery casing is the main force-bearing support structure. However, due to the structural limitations of the battery casing, structural installation interference or weak overall battery strength may occur. Summary of the Invention

[0003] The present invention provides a prismatic battery and a battery pack to improve the performance of the prismatic battery.

[0004] According to a first aspect of the present invention, a prismatic battery is provided, comprising a battery housing, the battery housing comprising a main body and a protruding portion, the protruding portion extending from the length direction of the main body, the main body and the protruding portion forming a large surface of the battery housing, and along the width direction of the main body, the ratio of the length dimension of the protruding portion to the width dimension of the main body is 0.3-0.8.

[0005] The prismatic battery of an embodiment of the present invention includes a battery case, and the protruding portion of the battery case extends from the length direction of the main body of the battery case, so that the main body and the protruding portion form a large surface of the battery case, and along the width direction of the main body, the ratio of the length dimension of the protruding portion to the width dimension of the main body is 0.3-0.8, that is, the size of the protruding portion can be relatively small, that is, the protruding portion can serve as a load-bearing area at the end of the battery, and the protruding portion can form an avoidance to avoid interference problems during installation, and form space for the installation of other structures, thereby reliably improving the safe use performance of the prismatic battery.

[0006] According to a second aspect of the present invention, there is provided a battery pack comprising the above-mentioned prismatic battery.

[0007] The battery pack of an embodiment of the present invention includes a prismatic battery, which includes a battery shell. The protruding portion of the battery shell extends from the length direction of the main body of the battery shell, so that the main body and the protruding portion form a large surface of the battery shell, and along the width direction of the main body, the ratio of the length dimension of the protruding portion to the width dimension of the main body is 0.3-0.8, that is, the size of the protruding portion can be relatively small, that is, the protruding portion can serve as a load-bearing area at the end of the battery, and the protruding portion can form an avoidance to avoid interference problems during installation, and form space for the installation of other structures, thereby reliably improving the safe use performance of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] For a better understanding of the present disclosure, reference may be made to the embodiments illustrated in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of the present disclosure. Furthermore, related elements or components may have different arrangements as is known in the art. Furthermore, in the drawings, the same reference numerals represent the same or similar components throughout the various figures.

[0009] in:

[0010] Figure 1 is a schematic structural diagram of a prismatic battery from one perspective according to an exemplary embodiment;

[0011] Figure 2 is a schematic structural diagram of a prismatic battery from another perspective according to an exemplary embodiment;

[0012] Figure 3 is a schematic structural diagram of a prismatic battery from one perspective according to another exemplary embodiment;

[0013] Figure 4 is a schematic structural diagram of a prismatic battery from another perspective according to another exemplary embodiment;

[0014] Figure 5 is a partial structural schematic diagram of a prismatic battery according to another exemplary embodiment;

[0015] Figure 6 is another partial structural schematic diagram of a prismatic battery according to another exemplary embodiment;

[0016] Figure 7 is a schematic cross-sectional structure diagram of a prismatic battery according to another exemplary embodiment;

[0017] Figure 8 is a schematic structural diagram of a prismatic battery cell according to an exemplary embodiment;

[0018] Figure 9 is a schematic structural diagram of a battery pack according to an exemplary embodiment.

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

[0020] 10. Battery case; 11. Main body; 12. Protruding part; 13. Large surface; 14. Explosion-proof valve; 15. Small surface; 16. Depression; 20. Pole assembly; 30. Battery cell; 31. Battery cell body; 32. First pole ear; 33. Second pole ear; 40. Insulating bracket; 41. First part; 42. Second part; 421. Accommodating space; 50. Bottom plate support. 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 for illustrative purposes only 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 this disclosure, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0023] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0024] Furthermore, in the description of the present disclosure, it should be understood that the directional words such as “upper”, “lower”, “inner” and “outer” described in the example embodiments of the present disclosure are described based on the angles shown in the accompanying drawings and should not be understood as limiting the example 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” or “outer”, it can not only be directly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer”, but can also be indirectly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer” through an intermediate element.

[0025] One embodiment of the present invention provides a prismatic battery, please refer to Figures 1 to 8 The prismatic battery includes a battery case 10, which includes a main body 11 and a protruding portion 12. The protruding portion 12 extends from the main body 11 in the length direction. The main body 11 and the protruding portion 12 form a large surface 13 of the battery case 10. Along the width direction of the main body 11, the ratio of the length dimension of the protruding portion 12 to the width dimension of the main body 11 is 0.3-0.8.

[0026] A prismatic battery according to an embodiment of the present invention includes a battery case 10, wherein a protruding portion 12 of the battery case 10 extends from a main portion 11 of the battery case 10 in a longitudinal direction, so that the main portion 11 and the protruding portion 12 form a large surface 13 of the battery case 10. In addition, along the width direction of the main portion 11, the ratio of the length dimension of the protruding portion 12 to the width dimension of the main portion 11 is 0.3-0.8, that is, the size of the protruding portion 12 can be relatively small, that is, the protruding portion 12 can serve as a load-bearing area at the end of the battery, and the protruding portion 12 can form an avoidance to avoid interference problems during installation, and form space for the installation of other structures, thereby reliably improving the safe use performance of the prismatic battery.

[0027] It should be noted that the battery housing 10 includes a main body 11 and a protruding portion 12. The protruding portion 12 extends from the length direction of the main body 11. The main body 11 and the protruding portion 12 form a large surface 13 of the battery housing 10, so that the battery housing 10 can have a larger length dimension, thereby ensuring the capacity of the battery and facilitating subsequent battery grouping.

[0028] Along the width direction of the main part 11, the ratio of the length dimension of the protruding part 12 to the width dimension of the main part 11 is 0.3-0.8, that is, the length dimension of the protruding part 12 is smaller than the width dimension of the main part 11, that is, the end dimension of the battery shell 10 is reduced, so that the protruding part 12 serves as the load-bearing area of the battery end. By reducing the area of the protruding part 12, the overall pressure of the protruding part 12 is smaller than that of the main part 11, thereby improving the overall strength of the battery. In addition, the protruding part 12 can be used to avoid other structures inside the box, thereby improving the safety performance when the batteries are grouped, and improving the space utilization of the battery pack.

[0029] Combine Figure 4 As shown, the length direction of the main body 11 is represented as X, the width direction of the main body 11 is represented as Y, along the width direction of the main body 11, the length dimension of the protruding portion 12 is represented as a, and the width dimension of the main body 11 is represented as b. The ratio of the length dimension a of the protruding portion 12 to the width dimension b of the main body 11 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8, etc.

[0030] Prismatic batteries do not include soft pack batteries.

[0031] In one embodiment, Figure 3As shown, the battery further includes: a pole assembly 20, at least a portion of which is disposed on the protruding portion 12, so that during the installation of the pole assembly 20, the risk of deformation of the protruding portion 12 can be reduced due to the relatively small size of the protruding portion 12, thereby improving the safe use performance of the battery housing 10.

[0032] like Figure 7 and Figure 8 As shown, the battery further includes: a battery cell 30, which is disposed in the battery housing 10, and the battery cell 30 is electrically connected to the pole assembly 20, so that the pole assembly 20 can be used as the electrode lead-out terminal of the battery, facilitating subsequent charging and discharging of the battery.

[0033] In one embodiment, Figure 7 and Figure 8 As shown, the battery cell 30 includes a battery cell body 31 and a first pole tab 32. The first pole tab 32 extends from one end of the battery cell body 31 and is electrically connected to the pole assembly 20. The battery cell body 31 is located in the main body 11, and at least part of the first pole tab 32 is located in the protruding portion 12. This allows for reasonable utilization of the internal space of the battery housing 10, improves the space utilization of the battery housing 10, and thereby improves the energy density of the battery.

[0034] The width dimension of the battery cell body 31 can be greater than the width dimension of the first pole tab 32. Therefore, by positioning the battery cell body 31 in the main body portion 11 and at least partially positioning the first pole tab 32 in the protruding portion 12, the internal space of the main body portion 11 and the protruding portion 12 can be well utilized, thereby improving the space utilization rate of the battery casing 10 and, to a certain extent, improving the energy density of the battery.

[0035] It should be noted that part of the first pole tab 32 can be located in the protruding portion 12, or the entire first pole tab 32 can be located in the protruding portion 12; or, both the battery cell body 31 and the first pole tab 32 can be located in the main portion 11, that is, the battery cell body 31 and the first pole tab 32 can be located in the main portion 11.

[0036] In one embodiment, along the length direction of the protruding portion 12, the ratio of the size of the first pole tab 32 to the length dimension of the protruding portion 12 is 0.5-0.9. This not only ensures that the first pole tab 32 has a reliable size, thereby ensuring the flow capacity of the first pole tab 32, but also avoids the first pole tab 32 from being too large to form excessive interference with the protruding portion 12, thereby reliably improving the safe use performance of the battery.

[0037] Along the length direction of the protruding portion 12, the size of the first electrode tab 32 can be expressed as the width dimension of the large surface of the first electrode tab 32. Along the length direction of the protruding portion 12, the ratio of the size of the first electrode tab 32 to the length dimension of the protruding portion 12 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85 or 0.9, etc.

[0038] In one embodiment, there are two protruding portions 12, and the two protruding portions 12 extend from opposite sides of the main body 11 respectively. The battery cell 30 also includes a second pole ear 33, and the first pole ear 32 and the second pole ear 33 extend from opposite ends of the battery cell body 31. At least parts of the first pole ear 32 and the second pole ear 33 are respectively located in the two protruding portions 12, so that the battery cell 30 can effectively utilize the internal space of the battery casing 10, thereby improving the space utilization of the battery casing 10 and ensuring the energy density of the battery.

[0039] Combine Figure 3 and Figure 4 As shown, there are two protruding portions 12, which extend from opposite sides of the main body 11 respectively, that is, along the length direction of the main body 11, the two protruding portions 12 are located on opposite sides of the main body 11 respectively. Figure 7 As shown, the first pole tab 32 and the second pole tab 33 extend from opposite ends of the battery cell body 31. The first pole tab 32 and the second pole tab 33 can correspond to the two protruding portions 12, and there can be two pole assemblies 20. The two pole assemblies 20 can be respectively arranged on the two protruding portions 12, so that the two pole assemblies 20 can be electrically connected to the first pole tab 32 and the second pole tab 33 with opposite polarities.

[0040] It should be noted that there can be two pole assemblies 20, and the two pole assemblies 20 can be electrically connected to the first pole ear 32 and the second pole ear 33 with opposite polarity, respectively, so that the two pole assemblies 20 serve as the two electrode lead-out terminals of the battery; or, there can be one pole assembly 20, and the first pole ear 32 and the second pole ear 33 with opposite polarity can be electrically connected to the pole assembly 20 and the battery shell 10, respectively, so that the pole assembly 20 and the battery shell 10 can serve as the two electrode lead-out terminals of the battery. At this time, the pole assembly 20 and the battery shell 10 are insulated.

[0041] It should be noted that a battery comprises a cell and an electrolyte, the smallest unit capable of carrying out electrochemical reactions such as charge and discharge. A cell is formed by winding or laminating a stack of components, which includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarity of the first and second electrodes can be interchanged. The first and second electrodes are coated with an active material.

[0042] The battery can be a laminated battery, which is not only convenient for grouping but also can be processed to obtain a longer battery. Specifically, the battery cell 30 is a laminated battery cell, which has a first electrode sheet stacked on top of each other, a second electrode sheet with an opposite electrical property to the first electrode sheet, and a separator sheet disposed between the first and second electrode sheets, so that multiple pairs of first and second electrode sheets are stacked to form a laminated battery cell.

[0043] Alternatively, the battery can be a wound battery, that is, the battery cell 30 is a wound battery cell, and the first electrode sheet, the second electrode sheet with opposite electrical properties to the first electrode sheet, and the diaphragm sheet arranged between the first electrode sheet and the second electrode sheet are wound to obtain the wound battery cell.

[0044] In one embodiment, a recess 16 is formed on the side of the protruding portion 12 facing away from the large surface 13, and at least a portion of the pole assembly 20 is located in the recess 16, so that the pole assembly 20 can use the space formed by the recess 16, thereby improving the space utilization of the battery. When the batteries are grouped, the pole assembly 20 can be prevented from increasing the space of the battery pack, which can improve the space utilization of the battery pack to a certain extent.

[0045] At least a portion of the pole assembly 20 is located in the recess 16 , that is, the pole assembly 20 may not protrude from the recess 16 , or a portion of the pole assembly 20 may protrude from the recess 16 .

[0046] In one embodiment, Figures 3 to 5 As shown, the pole assembly 20 is arranged on the large surface 13, and the recess 16 is used to accommodate the pole assembly of another battery, so that when the batteries are grouped, the recess 16 and the pole assembly of the adjacent battery can be adapted, thereby reliably improving the space utilization when the batteries are grouped, and further improving the energy density of the battery pack.

[0047] The main body 11 and the protruding portion 12 form a large surface 13 of the battery housing 10, and the pole assembly 20 is arranged on the large surface 13. Furthermore, the pole assembly 20 is arranged on the protruding portion 12. When the batteries are grouped, the large surfaces 13 of adjacent batteries are arranged relative to each other, thereby improving the grouping ability of the battery pack and improving the space utilization of the battery pack.

[0048] In one embodiment, the protruding portion 12 is located in the middle of the main portion 11 along the width direction of the main portion 11, that is, avoidance space can be formed on both the upper and lower sides of the protruding portion 12 to accommodate other structures of the box body, and it can also facilitate the molding of the protruding portion 12, which can improve the manufacturing efficiency of the battery to a certain extent.

[0049] In one embodiment, the protruding portion 12 is located in the central area of the main body 11 along the width direction of the main body 11, which not only facilitates the manufacture of the battery housing 10, but also makes the overall force of the battery housing 10 more balanced, avoiding the problem of local large force on the battery housing 10, thereby improving the safe use performance of the battery.

[0050] Along the width direction of the main body 11 , the protruding portion 12 is located in the center area of the main body 11 , that is, the distances between the protruding portion 12 and the upper and lower opposite sides of the main body 11 are substantially the same.

[0051] In one embodiment, along the width direction of the main body 11, the distance between the small surface 15 of the main body 11 perpendicular to the width direction of the main body 11 and the protruding portion 12 is 2 mm-10 mm, which not only allows the protruding portion 12 to reserve avoidance space, but also ensures that the protruding portion 12 can have a relatively suitable size, thereby improving the space utilization of the battery casing 10.

[0052] Combine Figure 4 As shown, along the width direction of the main body part 11, the distance between the small surface 15 of the main body part 11 perpendicular to the width direction of the main body part 11 and the protruding part 12 can be expressed as c, and c can be 2mm-10mm. Figure 4 c shown in the figure is the distance between the protruding portion 12 and the maximum circumferential outer edge of the main portion 11 in the width direction of the main portion 11. For example, when the main portion 11 has a flange edge, Figure 4 The distance shown in FIG is the distance between the circumferential outer edge of the flange and the protruding portion 12. Therefore, along the width direction of the main body 11, the distance between the small surface 15 of the main body 11 perpendicular to the width direction of the main body 11 and the protruding portion 12 needs to be c minus the size of the flange. Of course, the main body 11 may not have a flange. Figure 4 Shown in FIG. 1 is the distance between the small surface 15 of the main body portion 11 and the protruding portion 12 .

[0053] The distance between the small surface 15 of the main body 11 perpendicular to the width direction of the main body 11 and the protruding portion 12 can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0054] It should be noted that, combined with Figure 3 and Figure 4As shown, the main body 11 and the protruding portion 12 form a large surface 13 of the battery housing 10. The main body 11 has two opposite small surfaces 15. The area of the large surface 13 is larger than the small surface 15. The surface of the battery housing 10 that generates the most heat can be the large surface 13.

[0055] In one embodiment, along the length direction of the main body 11, the size of the protruding portion 12 is 10mm-50mm, so that the protruding portion 12 can have a reasonable size. It can not only be used to accommodate related structures, such as the tabs, thereby ensuring the current flow capacity of the tabs, but also avoid the protruding portion 12 being too large and increasing the length of the battery, thereby reliably improving the energy density of the battery.

[0056] Combine Figure 4 As shown, along the length direction of the main body part 11, the size of the protrusion 12 is expressed as d, and the size d of the protrusion 12 can be 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 13mm, 14mm, 15mm, 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 48mm, 49mm or 50mm, etc.

[0057] In one embodiment, along the thickness direction of the main body 11, the ratio of the size of the protruding portion 12 to the size of the main body 11 is 0.3-0.7, so that the protruding portion 12 can be used to form a reliable accommodating space, and can also form a reliable avoidance space on the outside of the protruding portion 12, thereby improving the space utilization when the batteries are grouped, thereby reliably improving the energy density of the battery pack.

[0058] Combine Figure 6 As shown, the thickness direction of the main part 11 is represented as Z, along the thickness direction of the main part 11, the size of the protruding part 12 is represented as e, and the size of the main part 11 is represented as f. The ratio of the size e of the protruding part 12 to the size f of the main part 11 can be 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65 or 0.7, etc.

[0059] In one embodiment, Figure 5 As shown, an explosion-proof valve 14 is provided on the protruding portion 12, so that when the internal pressure of the battery housing 10 reaches a certain height, the explosion-proof valve 14 can explode, thereby improving the safe use performance of the battery.

[0060] It should be noted that an explosion-proof valve 14 may be provided on the main body 11 . For example, an explosion-proof valve 14 may be provided on the small surface 15 of the main body 11 .

[0061] In one embodiment, the protrusion 12 and the explosion-proof valve 14 are integrally formed, which not only improves battery manufacturing efficiency but also ensures that the explosion-proof valve 14 can reliably protect the battery. The explosion-proof valve 14 can be a relatively weak portion, such as a corner area of the protrusion 12, or the protrusion 12 can be provided with notches, thereby forming the explosion-proof valve 14.

[0062] In one embodiment, the protruding portion 12 and the explosion-proof valve 14 are separate structures, and the explosion-proof valve 14 can be welded to the protruding portion 12, or the explosion-proof valve 14 can be bonded to the protruding portion 12. The explosion-proof valve 14 can be a pressure relief structure in related technologies such as an explosion-proof disk, which is not limited here.

[0063] In one embodiment, along the width direction of the main body 11, the minimum distance between the small surface 15 of the main body 11 perpendicular to the width direction of the main body 11 and the surface of the protruding portion 12 on which the explosion-proof valve 14 is provided is 2 mm to 10 mm, so that when the batteries are grouped, the explosion-proof valve 14 can have a reliable avoidance space, ensuring that the explosion-proof valve 14 can explode normally, thereby improving the safe use performance of the batteries.

[0064] Along the width direction of the main body 11, the minimum distance between the small surface 15 of the main body 11 perpendicular to the width direction of the main body 11 and the surface of the protruding portion 12 on which the explosion-proof valve 14 is provided can be 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0065] It should be noted that the protruding portion 12 has a surface perpendicular to the width direction of the main portion 11, and the explosion-proof valve 14 can be provided on this surface; alternatively, the protruding portion 12 has a surface perpendicular to the length direction of the main portion 11, and the explosion-proof valve 14 can be provided on this surface. One or more explosion-proof valves 14 can be provided on the protruding portion 12.

[0066] In one embodiment, Figure 1 and Figure 2 As shown, the battery further includes an insulating bracket 40, which is arranged around the circumferential outer surface of the battery shell 10. The insulating bracket 40 can not only achieve insulation protection for the battery, but also form strength protection for the battery, thereby improving the safety performance when the battery is grouped.

[0067] In one embodiment, Figure 1 and Figure 2As shown, the insulating bracket 40 includes a first part 41 and a second part 42 connected to each other, at least a portion of the first part 41 is arranged on the main part 11, and the second part 42 is arranged on the protruding part 12, so that the insulating bracket 40 can form a reliable protection for the main part 11 and the protruding part 12, thereby improving the safe use performance of the battery.

[0068] The first portion 41 is used to protect the small surface 15 of the main body portion 11 , and the second portion 42 forms protection for the circumferential outer surface of the protruding portion 12 , thereby improving the external insulation performance of the battery case 10 .

[0069] The battery housing 10 may be a metal housing, for example, the battery housing 10 may be an aluminum housing, or the battery housing 10 may be a steel housing, or the battery housing 10 may be a metal composite housing.

[0070] In one embodiment, the first part 41 is detachably connected to the second part 42, the first part 41 is detachably connected to the main part 11, and the second part 42 is detachably connected to the protruding part 12, thereby facilitating the safety and disassembly of the insulating bracket 40, and also facilitating subsequent maintenance of the battery, thereby improving the service life of the battery.

[0071] The first portion 41 and the second portion 42 may be snap-fitted, or the first portion 41 and the second portion 42 may be bonded, or the first portion 41 and the second portion 42 may be connected by a fastener.

[0072] The insulating support 40 may be a plastic part, or a rubber part, etc., which is not limited here. Of course, in some embodiments, it is not excluded that the insulating support 40 may be formed of metal and an insulating coating.

[0073] In one embodiment, the end of the second portion 42 toward the first portion 41 does not extend beyond the main body 11 , thereby preventing the second portion 42 from being too large, reducing the weight of the battery to a certain extent, and improving the energy density of the battery.

[0074] An end portion of the second portion 42 may be connected to the first portion 41 , or a portion of the second portion 42 may overlap with the first portion 41 .

[0075] In one embodiment, combined Figure 2 and Figure 3 As shown, a recess 16 is formed on the side of the protruding portion 12 away from the large surface 13, and the second portion 42 is provided with a receiving space 421 for accommodating a pole assembly of another battery, thereby improving the space utilization of the battery pack when the batteries are grouped, thereby improving the energy density of the battery pack.

[0076] In one embodiment, the length of the battery is ≥400 mm, that is, the battery has a relatively long length, which not only ensures the capacity of the battery, but also enables the battery to have a reliable energy density, and also facilitates subsequent battery grouping.

[0077] The length of the battery can be 400mm, 420mm, 430mm, 450mm, 460mm, 480mm, 490mm, 500mm, 520mm, 530mm, 550mm, 560mm, 580mm, 590mm, 600mm, 620mm, 650mm, 680mm, 700mm, 720mm, 750mm, 780mm, 800mm, 850mm, 860mm, 880mm, 890mm or 900mm, etc.

[0078] The width of the battery can be 70mm-130mm, that is, the width of the main part 11 can be 70mm-130mm. For example, the width of the battery can be 70mm, 75mm, 80mm, 85mm, 90mm, 100mm, 105mm, 110mm, 115mm, 120mm, 125mm or 130mm, etc.

[0079] In one embodiment, the main body 11 is in the shape of a quadrangular prism. The quadrangular prism mainly refers to a generally prism-shaped appearance, but does not strictly limit whether each side of the prism must be a strictly straight line, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0080] It should be noted that the battery housing 10 may include a first housing member and a second housing member. The first housing member and the second housing member may be independently provided. For example, the first housing member and the second housing member may be formed separately and then welded together. In certain embodiments, it is not ruled out that the first housing member and the second housing member may be a monolithic structure, with a space for accommodating the battery cell 30 formed by stamping, and then sealed and connected by welding.

[0081] In one embodiment, the wall thickness of the battery housing 10 is 0.1 mm-0.5 mm, so that the weight of the battery housing 10 can be reduced, thereby increasing the energy density of the battery.

[0082] The wall thickness of the battery housing 10 may be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm, etc.

[0083] One embodiment of the present invention further provides a battery pack including the above-mentioned prismatic battery.

[0084] A battery pack according to an embodiment of the present invention includes a prismatic battery, which includes a battery case 10. A protruding portion 12 of the battery case 10 extends from the length direction of the main body 11 of the battery case 10, so that the main body 11 and the protruding portion 12 form a large surface 13 of the battery case 10. Along the width direction of the main body 11, the ratio of the length dimension of the protruding portion 12 to the width dimension of the main body 11 is 0.3-0.8, that is, the size of the protruding portion 12 can be relatively small, that is, the protruding portion 12 can serve as a load-bearing area at the end of the battery, and the protruding portion 12 can form an avoidance to avoid interference problems during installation, and form space for the installation of other structures, thereby reliably improving the safe use performance of the battery pack.

[0085] In one embodiment, the battery pack is a battery module or a battery pack.

[0086] The battery module includes a plurality of batteries, which may be substantially square batteries. The battery module may further include end plates and side plates, which are used to fix the plurality of batteries.

[0087] The battery pack includes multiple batteries and a box body, and the box body is used to fix the multiple batteries.

[0088] It should be noted that the battery pack includes multiple batteries, which can be placed in a housing. The batteries can be assembled into a battery module and then installed in the housing. Alternatively, the batteries can be placed directly in the housing, without grouping them together, and the housing can be used to secure the batteries.

[0089] In one embodiment, Figure 9 As shown, the battery pack further includes a bottom plate support 50 , the battery is arranged on the bottom plate support 50 , and the protruding portion 12 is spaced apart from the bottom plate support 50 , so that an escape space can be formed between the protruding portion 12 and the bottom plate support 50 .

[0090] An explosion-proof valve 14 is provided on the protruding portion 12 and is arranged opposite to the bottom plate support 50, so that after the explosion-proof valve 14 explodes, the internal gas of the battery can be sprayed toward the bottom plate support 50, which can improve the safe use performance of the battery pack to a certain extent and prevent the gas from being directly sprayed into the passenger compartment of the vehicle.

[0091] An explosion-proof valve 14 is provided on the protruding portion 12 , and the explosion-proof valve 14 is arranged opposite to the bottom plate support 50 .

[0092] In one embodiment, the distance between the protruding portion 12 and the bottom plate support 50 is 2 mm to 20 mm, so that the bottom plate support 50 does not interfere with the explosion-proof valve 14, ensuring that the explosion-proof valve 14 can explode normally, thereby improving the safety performance of the battery pack.

[0093] The bottom plate support 50 may be a part of the box, or the bottom plate support 50 may be another component in the box, which is not limited here, and the focus is on reflecting that the explosion-proof valve 14 and the bottom plate support 50 are arranged relative to each other.

[0094] There are multiple batteries, and the large surfaces 13 of the multiple batteries can be arranged relative to each other, that is, the stacking direction of the battery pack is perpendicular to the large surfaces 13 of the batteries.

[0095] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the inventions disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and illustrative embodiments are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0096] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A prismatic battery, characterized in that: The battery housing (10) comprises a main body (11) and a protruding portion (12), wherein the protruding portion (12) extends from the main body (11) in the longitudinal direction, the main body (11) and the protruding portion (12) form a large surface (13) of the battery housing (10), and along the width direction of the main body (11), the ratio of the length dimension of the protruding portion (12) to the width dimension of the main body (11) is 0.3-0.8; the battery further comprises: a pole assembly (20), at least a portion of the pole assembly (20) being disposed on the protruding portion (12); A battery cell (30), the battery cell (30) being disposed in the battery housing (10), the battery cell (30) being electrically connected to the pole assembly (20), the battery cell (30) comprising a battery cell body (31) and a first pole lug (32), the first pole lug (32) extending from one end of the battery cell body (31), the first pole lug (32) being electrically connected to the pole assembly (20); The battery cell body (31) is located in the main body portion (11), and at least a portion of the first tab (32) is located in the protruding portion (12).

2. The prismatic battery according to claim 1, wherein: Along the length direction of the protruding portion (12), the ratio of the size of the first electrode tab (32) to the length of the protruding portion (12) is 0.5-0.

9.

3. The prismatic battery according to claim 1, wherein: There are two protruding portions (12), and the two protruding portions (12) extend from opposite sides of the main body (11), respectively. The battery cell (30) further includes a second pole lug (33), and the first pole lug (32) and the second pole lug (33) extend from opposite ends of the battery cell main body (31), and at least parts of the first pole lug (32) and the second pole lug (33) are respectively located in the two protruding portions (12).

4. The prismatic battery according to claim 1, wherein: The battery core (30) is a laminated battery core.

5. The prismatic battery according to claim 1, wherein: A recess (16) is formed on the side of the protruding portion (12) facing away from the large surface (13), and at least a portion of the pole assembly (20) is located in the recess (16); alternatively, the pole assembly (20) is arranged on the large surface (13), and the recess (16) is used to accommodate another pole assembly of the battery.

6. The prismatic battery according to claim 1, wherein: Along the width direction of the main body part (11), the protruding part (12) is located in the middle of the main body part (11).

7. The prismatic battery according to claim 6, wherein: Along the width direction of the main body part (11), the distance between the small surface (15) of the main body part (11) perpendicular to the width direction of the main body part (11) and the protruding part (12) is 2mm-10mm.

8. The prismatic battery according to claim 1, wherein: Along the length direction of the main body part (11), the size of the protruding part (12) is 10mm-50mm.

9. The prismatic battery according to claim 1, wherein: Along the thickness direction of the main body part (11), the ratio of the size of the protruding part (12) to the size of the main body part (11) is 0.3-0.

7.

10. The prismatic battery according to any one of claims 1 to 9, wherein: An explosion-proof valve (14) is provided on the protruding portion (12).

11. The prismatic battery according to claim 10, wherein: The protruding portion (12) and the explosion-proof valve (14) are an integrally formed structure, or the protruding portion (12) and the explosion-proof valve (14) are a split structure.

12. The prismatic battery according to claim 10, wherein: Along the width direction of the main body part (11), the minimum distance between the small surface (15) of the main body part (11) perpendicular to the width direction of the main body part (11) and the surface of the protruding part (12) provided with the explosion-proof valve (14) is 2mm-10mm.

13. The prismatic battery according to any one of claims 1 to 9, wherein: The battery further comprises an insulating support (40), wherein the insulating support (40) is arranged around the circumferential outer surface of the battery housing (10).

14. The prismatic battery according to claim 13, wherein: The insulating bracket (40) comprises a first part (41) and a second part (42) connected to each other, wherein at least a portion of the first part (41) is arranged on the main part (11), and the second part (42) is arranged on the protruding part (12).

15. The prismatic battery according to claim 14, wherein: The first part (41) and the second part (42) are detachably connected, the first part (41) and the main body part (11) are detachably connected, and the second part (42) and the protruding part (12) are detachably connected.

16. The prismatic battery according to claim 14 or 15, wherein: The end of the second portion (42) facing the first portion (41) does not extend beyond the main body portion (11).

17. The prismatic battery according to claim 14 or 15, wherein: A recess (16) is formed on the side of the protruding portion (12) facing away from the large surface (13), and the second portion (42) is provided with an accommodating space (421) for accommodating a pole assembly of another battery.

18. The prismatic battery according to any one of claims 1 to 9, wherein: The length of the battery is ≥400 mm.

19. A battery pack, characterized in that: A prismatic battery comprising the prismatic battery according to any one of claims 1 to 18.

20. The battery pack according to claim 19, wherein: The battery pack further comprises a bottom plate support (50), the battery is arranged on the bottom plate support (50), and the protruding portion (12) is spaced apart from the bottom plate support (50); Wherein, an explosion-proof valve (14) is provided on the protruding portion (12) and is arranged opposite to the bottom plate support (50).

21. The battery pack according to claim 20, wherein: The distance between the protruding portion (12) and the bottom plate support (50) is 2 mm to 20 mm.

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