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 which comprises steel and comprises a first shell end face; the battery cell is arranged in the battery shell, the battery cell comprises a battery cell body and a tab part, and the tab part extends out from one end, facing the first shell end surface, of the battery cell body; wherein the ratio of the size a of the tab part to the size b of the end face of the first shell is 30%-99.8% in the direction parallel to the large surface of the tab part and perpendicular to the direction in which the tab part extends out of the battery cell body, so that the overall heat dissipation efficiency of the battery cell can be ensured, and the overall fast charging performance of the battery is further ensured; and the risk of insulation failure between the tab part and the end face of the first shell can be avoided, so that the safe use performance of the quadrangular prism type battery can be effectively 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 technology, the material of the battery shell can be selected from aluminum or steel. Compared with the steel shell, the thermal conductivity of the aluminum shell is relatively excellent, and the heat transfer rate between the battery cell and the battery shell is faster. However, when using a steel shell, although the corrosion risk of the battery shell can be reduced, the thermal conductivity of the steel shell is poor, which may affect the overall fast charging performance of the battery. 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 housing, the battery housing comprising steel, the battery housing comprising a first housing end surface;

[0006] A battery cell, the battery cell is arranged in the battery housing, the battery cell comprises a battery cell body and a pole ear portion, and the pole ear portion extends from one end of the battery cell body toward an end surface of the first housing;

[0007] Wherein, along a direction parallel to the large surface of the pole ear portion and perpendicular to the direction in which the pole ear portion extends from the battery cell body, the ratio of the dimension a of the pole ear portion to the dimension b of the end surface of the first shell is 30%-99.8%.

[0008] The quadrangular prism battery of the utility model embodiment includes a battery shell and a battery cell, the battery cell is arranged in the battery shell, the battery shell includes steel, the thermal conductivity of steel is relatively small, the pole ear portion of the battery cell extends from one end of the battery cell body toward the first shell end face, and along the direction parallel to the large surface of the pole ear portion and perpendicular to the direction in which the pole ear portion extends from the battery cell body, the ratio of the dimension a of the pole ear portion to the dimension b of the first shell end face is 30%-99.8%, thereby ensuring the overall heat dissipation efficiency of the battery cell, and then ensuring the overall fast charging performance of the battery, and avoiding the risk of insulation failure between the pole ear portion and the first shell end face, thereby effectively improving the safe use performance of the quadrangular prism battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] 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:

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

[0011] Figure 2 is a schematic diagram of a partially exploded structure of a battery according to an exemplary embodiment;

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

[0013] Figure 4 is a schematic structural diagram of a battery cell according to a first exemplary embodiment;

[0014] Figure 5 is a schematic structural diagram of a battery cell according to a second exemplary embodiment;

[0015] Figure 6 is a schematic structural diagram of a battery cell according to a third exemplary embodiment;

[0016] Figure 7 is a schematic diagram of a partial structure of a battery cell according to an exemplary embodiment.

[0017] The following are the descriptions of the reference numerals:

[0018] 10. Battery shell; 11. First shell end face; 111. Liquid injection hole; 112. Explosion-proof valve; 12. Second shell end face; 13. Third shell end face; 20. Battery cell; 21. Battery cell body; 211. First pole piece; 212. Second pole piece; 213. Diaphragm; 22. Pole ear; 30. Electrode terminal assembly. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] An embodiment of the utility model provides a quadrangular prism battery, please refer to Figures 1 to 7 The quadrangular prism battery includes: a battery shell 10, the battery shell 10 includes steel, and the battery shell 10 includes a first shell end face 11; a battery cell 20, the battery cell 20 is arranged in the battery shell 10, and the battery cell 20 includes a battery cell body 21 and a pole ear portion 22, and the pole ear portion 22 extends from one end of the battery cell body 21 toward the first shell end face 11; wherein, along a direction parallel to the large surface of the pole ear portion 22 and perpendicular to the direction in which the pole ear portion 22 extends from the battery cell body 21, the ratio of the dimension a of the pole ear portion 22 to the dimension b of the first shell end face 11 is 30%-99.8%.

[0024] A quadrangular prism battery according to an embodiment of the utility model comprises a battery shell 10 and a battery cell 20, wherein the battery cell 20 is arranged in the battery shell 10, and the battery shell 10 comprises steel, the thermal conductivity of steel is relatively small, and a pole ear portion 22 of the battery cell 20 extends from one end of the battery cell body 21 toward the first shell end face 11, and along a direction parallel to the large surface of the pole ear portion 22 and perpendicular to the direction in which the pole ear portion 22 extends from the battery cell body 21, a ratio of a dimension a of the pole ear portion 22 to a dimension b of the first shell end face 11 is 30%-99.8%, thereby ensuring the overall heat dissipation efficiency of the battery cell 20, and further ensuring the overall fast charging performance of the battery, and avoiding the risk of insulation failure between the pole ear portion 22 and the first shell end face 11, thereby effectively improving the safe use performance of the quadrangular prism battery.

[0025] It should be noted that the quadrangular prism type battery mainly refers to a battery with a prism shape, but it does not strictly limit 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.

[0026] The battery housing 10 includes steel, which may include pure steel, carbon steel, nickel-plated steel, etc. The steel may include martensitic steel, austenitic steel, etc., which are not limited here. The battery housing 10 may be a steel shell.

[0027] Combination Figures 1 to 3 As shown, the battery shell 10 includes a first shell end surface 11, and the battery cell 20 includes a battery cell body 21 and a pole ear portion 22, and the pole ear portion 22 extends from one end of the battery cell body 21 toward the first shell end surface 11, that is, the pole ear portion 22 can be arranged directly opposite to the first shell end surface 11.

[0028] The pole ear portion 22 has a large surface, that is, the large surface of the pole ear portion 22 can be considered as the surface with the largest area of ​​the pole ear portion 22. Further, the large surface of the pole ear portion 22 can be considered as the large surface of the pole ear layer after the various pole ear layers forming the pole ear portion 22 are straightened. The direction in which the pole ear portion 22 extends from the battery cell body 21 is the direction in which the pole ear layer extends from the battery cell body 21 after the various pole ear layers of the pole ear portion 22 are straightened.

[0029] Combination Figure 2 As shown, the direction parallel to the large surface of the pole ear 22 and perpendicular to the direction in which the pole ear 22 extends from the battery body 21 can be represented as A. When the first shell end face 11 is a flat plate, the length direction of the first shell end face 11 can be represented as A. The size of the pole ear 22 can be represented as a, and the size of the first shell end face 11 can be represented as b. If the ratio of the size a of the pole ear 22 to the size b of the first shell end face 11 is too small, the thermal conductivity of steel is small, which affects the overall heat dissipation efficiency of the battery 20 and is not conducive to ensuring the overall fast charging performance of the battery. Therefore, the size a of the pole ear 22 can be appropriately increased to achieve overall rapid heat dissipation of the battery 20; if the ratio of the size a of the pole ear 22 to the size b of the first shell end face 11 is too large, the pole ear 22 may block the open end of the battery body 21, affecting the gas and liquid diffusion rate of the battery 20, and the distance between the first shell end face 11 and the pole ear 22 is too close, there is a risk of insulation failure, affecting the safe use performance of the quadrangular prism battery.

[0030] The ratio of the dimension a of the pole ear portion 22 to the dimension b of the first shell end surface 11 can be 30%, 30.5%, 31%, 31.5%, 32%, 32.5%, 33%, 33.5%, 34%, 34.5%, 35%, 35.5%, 36%, 36.5%, 37%, 37.5%, 38%, 38.5%, 39%, 39.5%, 40%, 41%, 42%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%, 81%, 82%, 83%, 84%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100%, 101%, 102%, 103%, 104%, 105%, 106%, 107%, 108%, 109%, 110%, 111%, 112%, 113%, 114%, 115%, 116%, 117%, 118%, 119%, 120%, 121%, 122%, 123%, 124%, 125%, 126%, 127%, 128%, 129%, 6%, 48%, 50%, 51%, 52%, 55%, 56%, 58%, 60%, 61%, 62%, 65%, 66%, 68%, 70%, 71%, 72%, 75%, 76%, 78%, 80%, 81%, 82%, 85%, 86%, 88%, 90%, 91%, 92%, 95%, 96%, 97%, 98%, 99% or 99.8% and so on.

[0031] In one embodiment, Figure 7 As shown, the battery cell body 21 includes a first pole piece 211, a second pole piece 212 and a diaphragm 213 located between the first pole piece 211 and the second pole piece 212, the first pole piece 211 and the second pole piece 212 have opposite polarities, and the pole ear portion 22 extends from the first pole piece 211; wherein, along the thickness direction of the battery cell body 21, the first pole piece 211 includes a plurality of pole piece layers, the pole ear portion 22 includes a plurality of pole ear layers, and the ratio of the total number of pole ear layers to the total number of pole piece layers is ≥70%, and a / b ≤99.5%, thereby ensuring that the pole ear portion 22 has sufficient current capacity, and also enabling the battery cell 20 to quickly dissipate heat through the pole ear portion 22, thereby improving the safe use performance of the quadrangular prism battery, and also avoiding the risk of short circuit caused by the pole ear portion 22 being too large and overlapping with the battery shell 10, thereby appropriately controlling the ratio of the size a of the pole ear portion 22 to the size b of the first shell end face 11.

[0032] Combination Figure 5 As shown, the thickness direction of the battery cell body 21 can be expressed as B, and the thickness direction of the battery cell body 21 can be perpendicular to the large surface of the battery cell body 21. Further, the thickness direction of the battery cell body 21 is perpendicular to the direction of the large surface of the pole ear portion 22, or the thickness direction of the battery cell body 21 is perpendicular to the direction of the large surface of the pole sheet layer. Along the thickness direction of the battery cell body 21, the first pole sheet 211 includes multiple pole sheet layers, and the pole ear portion 22 includes multiple pole ear layers, that is, the first pole sheet 211 is formed by stacking multiple pole sheet layers, and the pole ear portion 22 is formed by stacking multiple pole ear layers.

[0033] The ratio of the total number of pole lug layers to the total number of pole sheet layers can be 70%, 71%, 72%, 73%, 75%, 77%, 78%, 80%, 81%, 82%, 83%, 85%, 87%, 88%, 90%, 91%, 92%, 93%, 95%, 97%, 98% or 100%, etc.

[0034] In one embodiment, Figure 5 As shown, the battery cell 20 is a laminated battery cell, and the ratio of the total number of tab layers to the total number of pole sheet layers is greater than or equal to 100%. Thus, sufficient tab layers can be used to improve the overall heat dissipation capacity of the battery, thereby effectively ensuring the safe use performance of the battery.

[0035] The battery cell 20 is a stacked battery cell, and the multiple electrode layers of the stacked battery cell are independently arranged, so it is necessary to ensure that a pole ear layer extends from each pole sheet layer, that is, the ratio of the total number of pole ear layers to the total number of pole sheet layers can be 1, that is, a pole ear layer extends from each pole sheet layer, thereby ensuring the electrical performance of the battery cell 20.

[0036] Alternatively, the battery cell 20 is a stacked battery cell, in which multiple pole sheet layers are independently arranged, and a pole lug layer extends from each pole sheet layer. It is not ruled out that a pole sheet layer may have a relatively long pole lug layer, and the pole lug layer is folded. Therefore, along the thickness direction of the battery cell body 21, the total number of pole lug layers included in the pole lug portion 22 can be more than the total number of pole sheet layers included in the first pole sheet 211, that is, the ratio of the total number of pole lug layers to the total number of pole sheet layers is greater than 100%.

[0037] In one embodiment, Figure 6 As shown, the battery cell 20 is a wound battery cell, and a / b≥35%, so that the battery cell 20 can be easily formed, thereby improving the manufacturing efficiency of the quadrangular prism battery.

[0038] The battery cell 20 is a wound battery cell. Due to the presence of corners, the heat dissipation efficiency of the wound battery cell is poor compared to the laminated battery cell. The ratio of the size a of the pole ear portion 22 to the size b of the first shell end face 11 is increased to achieve rapid heat dissipation of the battery cell 20 and the battery shell 10. In particular, the battery shell 10 adopts a steel shell, which has a significantly different thermal conductivity rate than an aluminum shell.

[0039] Figure 6 In the wound cell shown in FIG. 1 , the two pole ear portions 22 extend from the same end of the cell body 21 ; or, the two pole ear portions 22 of the wound cell may extend from opposite ends of the cell body 21 .

[0040] The battery cell 20 is a wound battery cell, and multiple electrode layers of the wound battery cell are connected, that is, the multiple electrode layers of the wound battery cell form a whole, so that some electrode layers are not provided with pole lug layers, that is, the ratio of the total number of pole lug layers to the total number of pole sheet layers can be less than 1. Of course, it is not ruled out that the ratio of the total number of pole lug layers to the total number of pole sheet layers can be 1.

[0041] It should be noted that the cell body 21 includes a first pole piece 211, a second pole piece 212, and a diaphragm 213 located between the first pole piece 211 and the second pole piece 212. The first pole piece 211 and the second pole piece 212 have opposite polarities. There may be two pole ears 22, one pole ear 22 may extend from the first pole piece 211, and the other pole ear 22 may extend from the second pole piece 212. The ratio of the total number of pole ear layers to the total number of pole sheet layers is the ratio of the total number of pole ear layers extending from the first pole piece 211 to the total number of pole sheet layers of the first pole piece 211.

[0042] In one embodiment, the ratio of the area enclosed by the circumferential outer edge of one end of the battery cell body 21 facing the first shell end face 11 to the area enclosed by the circumferential outer edge of the first shell end face 11 is 90%-99.95%, thereby ensuring the space utilization of the battery shell 10, thereby ensuring the energy density of the quadrangular prism battery.

[0043] The ratio of the area enclosed by the circumferential outer edge of one end of the battery cell body 21 facing the first shell end face 11 to the area enclosed by the circumferential outer edge of the first shell end face 11 can be 90%, 90.5%, 91%, 91.5%, 92%, 92.5%, 93%, 93.5%, 94%, 94.5%, 95%, 95.5%, 96%, 96.5%, 97%, 97.5%, 98%, 98.5%, 99%, 99.5% or 99.95%, etc.

[0044] In one embodiment, at least one of an injection hole 111 and an explosion-proof valve 112 is provided on the battery housing 10, so that the electrolyte can be injected into the battery housing 10 through the injection hole 111. When the internal pressure of the battery housing 10 is too high, the explosion-proof valve 112 can burst open, thereby avoiding safety problems of the quadrangular prism battery.

[0045] At least one of the liquid injection hole 111 and the explosion-proof valve 112 is disposed on the first shell end surface 11 , thereby making full use of the space of the first shell end surface 11 .

[0046] The liquid injection hole 111 and the explosion-proof valve 112 may both be disposed on the first shell end surface 11 .

[0047] Combination Figure 3As shown, the injection hole 111 can be arranged on the first shell end surface 11 , and the explosion-proof valve 112 can be arranged on the second shell end surface 12 .

[0048] In one embodiment, the ratio of the dimension a of the pole ear portion 22 to the dimension b of the first shell end surface 11 is ≤85%, thereby preventing the dimension a of the pole ear portion 22 from being too large, which would affect the diffusion rate of gas and liquid, reduce the shielding of the battery cell body 21 by the pole ear portion 22, and reduce the liquid injection efficiency of the end surface of the battery cell 20.

[0049] At least one of the injection hole 111 and the explosion-proof valve 112 is disposed on the first shell end surface 11. For example, if the injection hole 111 is disposed on the first shell end surface 11, when the dimension a of the pole ear portion 22 is too long, the injection efficiency of the electrolyte will be affected. If the explosion-proof valve 112 is disposed on the first shell end surface 11, when the dimension a of the pole ear portion 22 is too long, the diffusion of the gas will be affected, thereby avoiding the problem that the explosion-proof valve 112 cannot explode in time.

[0050] In one embodiment, the battery shell 10 also includes a second shell end face 12, which is perpendicular to the first shell end face 11, and is provided with at least one of a liquid injection hole 111 and an explosion-proof valve 112; wherein, the quadrangular prism-type battery also includes an electrode terminal assembly 30, which is arranged on the second shell end face 12, and the electrode terminal assembly 30 is electrically connected to the pole ear portion 22, so that the battery can be charged and discharged through the electrode terminal assembly 30.

[0051] One end of the electrode terminal assembly 30 can be used to be electrically connected to the electrode ear portion 22, and one end of the electrode terminal assembly 30 can be used to be electrically connected to the bus bar, thereby forming an electrical connection between the batteries.

[0052] The electrode terminal assembly 30 can be electrically connected to the pole ear portion 22 through the adapter. There can be two electrode terminal assemblies 30, and there can be two pole ear portions 22. The two electrode terminal assemblies 30 can be a positive electrode terminal assembly and a negative electrode terminal assembly respectively. The two pole ear portions 22 can be a positive pole ear and a negative pole ear respectively. The positive electrode terminal assembly and the negative electrode terminal assembly can be connected to the positive pole ear and the negative pole ear respectively. The two pole ear portions 22 can extend from opposite ends of the battery body 21.

[0053] Combination Figure 1 As shown, a liquid injection hole 111 and an explosion-proof valve 112 are provided on the second shell end surface 12 , and two electrode terminal assemblies 30 can be provided on the second shell end surface 12 .

[0054] In one embodiment, the thermal conductivity of the battery housing 10 is 10 (m·k)-90w / (m·k), thereby the heat dissipation capacity of the quadrangular prism battery can be ensured by controlling the ratio of the dimension a of the pole ear portion 22 to the dimension b of the first housing end surface 11 .

[0055] The thermal conductivity of the battery shell 10 can be 10 (m·k), 12 (m·k), 15 (m·k), 18 (m·k), 20 (m·k), 22 (m·k), 25 (m·k), 28 (m·k), 30 (m·k), 32 (m·k), 35 (m·k), 38 (m·k), 40 (m·k), 42 (m·k), 45 (m·k), 48 (m·k), 50 (m·k), 52 (m·k), 55 (m·k), 58 (m·k), 60 (m·k), 62 (m·k), 65 (m·k), 68 (m·k), 70 (m·k), 72 (m·k), 75 (m·k), 78 (m·k), 80 (m·k), 82 (m·k), 85 (m·k), 88 (m·k) or 90 w / (m·k), etc.

[0056] In one embodiment, the ratio of the wall thickness of the battery shell 10 to the length dimension c of the pole ear portion 22 extending from the battery cell body 21 is 0.1%-2%. The length dimension of the pole ear portion 22 is the dimension of the pole ear portion 22 extending from the battery cell body 21. On the basis of ensuring the heat dissipation capacity of the quadrangular prism battery, the structural strength of the battery shell 10 can also be ensured.

[0057] Combination Figure 4 As shown, the length dimension of the pole ear portion 22 extending from the battery body 21 can be expressed as c, that is, the length dimension of the pole ear portion 22 after being straightened. The ratio of the wall thickness of the battery case 10 to the length dimension c of the pole ear portion 22 extending from the battery body 21 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% or 2%, etc.

[0058] The ratio of the wall thickness of the battery shell 10 to the length of the pole ear 22 extending from the battery cell body 21 is too small, the strength of the battery shell 10 is relatively weak, the battery cell 20 is too large and the risk of tearing is greater, and a large amount of metal chips are easily introduced into the quadrangular prism type battery; the ratio of the wall thickness of the battery shell 10 to the length of the pole ear 22 extending from the battery cell body 21 is too large, the thermal conductivity of the quadrangular prism type battery is poor, the risk of internal thermal runaway is greater, and it is easy to cause safety risks of the quadrangular prism type battery.

[0059] In one embodiment, Figure 1As shown, the battery shell 10 also includes a second shell end face 12 and a third shell end face 13, the second shell end face 12 and the third shell end face 13 are connected, and the second shell end face 12 and the third shell end face 13 are both connected to the first shell end face 11, the second shell end face 12 and the third shell end face 13 are both perpendicular to the first shell end face 11, the area of ​​the third shell end face 13 is greater than the area of ​​the first shell end face 11, the area of ​​the third shell end face 13 is greater than the area of ​​the second shell end face 12, and the thickness of the first shell end face 11 is ≤0.45mm; wherein, the quadrangular prism type battery also includes an electrode terminal assembly 30, the electrode terminal assembly 30 is arranged on the second shell end face 12, and the electrode terminal assembly 30 is electrically connected to the pole ear portion 22, so that the electrode terminal assembly 30 and the pole ear portion 22 can be located in different orientations, thereby improving the heat dissipation capacity of the quadrangular prism type battery.

[0060] The first shell end surface 11 is the side of the battery shell 10 with the smallest area. By reducing the thickness of the first shell end surface 11, the overall thermal conductivity of the quadrangular prism-type battery can be improved.

[0061] The thickness of the first shell end surface 11 may be 0.45 mm, 0.42 mm, 0.4 mm, 0.38 mm, 0.35 mm, 0.32 mm, 0.3 mm, 0.25 mm or 0.2 mm, etc.

[0062] In one embodiment, Figure 3 As shown, the battery case 10 also includes a second case end face 12 and a third case end face 13, the second case end face 12 and the third case end face 13 are connected, and the second case end face 12 and the third case end face 13 are both connected to the first case end face 11, the second case end face 12 and the third case end face 13 are both perpendicular to the first case end face 11, the area of ​​the third case end face 13 is larger than the area of ​​the first case end face 11, and the area of ​​the third case end face 13 is larger than the area of ​​the second case end face 12; wherein, the quadrangular prism type battery also includes an electrode terminal assembly 30, the electrode terminal assembly 30 is arranged on the first case end face 11, and the electrode terminal assembly 30 is electrically connected to the pole ear portion 22, that is, the electrode terminal assembly 30 is arranged opposite to the pole ear portion 22, thereby facilitating the connection between the electrode terminal assembly 30 and the pole ear portion 22, and improving the internal space utilization rate of the battery case 10.

[0063] It should be noted that the battery housing 10 includes a first housing end face 11, a second housing end face 12 and a third housing end face 13. The first housing end face 11 may be a housing member, such as Figure 1 Alternatively, the first shell end surface 11 may be a cover plate, such as Figure 3 shown.

[0064] An embodiment of the present invention further provides a battery pack, comprising the above-mentioned quadrangular prism battery.

[0065] A quadrangular prism-shaped battery of a battery pack of one embodiment of the utility model comprises a battery shell 10 and a battery cell 20. The battery cell 20 is arranged in the battery shell 10. The battery shell 10 comprises steel. The thermal conductivity of steel is relatively small. The pole ear portion 22 of the battery cell 20 extends from one end of the battery cell body 21 toward the first shell end face 11. In a direction parallel to the large surface of the pole ear portion 22 and perpendicular to the direction in which the pole ear portion 22 extends from the battery cell body 21, the ratio of the dimension a of the pole ear portion 22 to the dimension b of the first shell end face 11 is 30%-99.8%, thereby ensuring the overall heat dissipation efficiency of the battery cell 20, and further ensuring the overall fast charging performance of the battery, and avoiding the risk of insulation failure between the pole ear portion 22 and the first shell end face 11, thereby effectively improving the safe use performance of the battery pack.

[0066] In one embodiment, the battery pack is a battery module or a battery pack.

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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 (10), the battery housing (10) comprising steel, the battery housing (10) comprising a first housing end surface (11); A battery cell (20), the battery cell (20) being arranged in the battery casing (10), the battery cell (20) comprising a battery cell body (21) and a pole ear portion (22), the pole ear portion (22) extending from one end of the battery cell body (21) toward the first casing end surface (11); In which, along a direction parallel to the large surface of the pole ear portion (22) and perpendicular to the direction in which the pole ear portion (22) extends from the battery cell body (21), the ratio of the dimension a of the pole ear portion (22) to the dimension b of the first shell end surface (11) is 30%-99.8%, and the large surface of the pole ear portion (22) is the surface with the largest area of ​​the pole ear portion (22).

2. The quadrangular prism battery according to claim 1, characterized in that: The battery cell body (21) comprises a first pole piece (211), a second pole piece (212) and a diaphragm (213) located between the first pole piece (211) and the second pole piece (212); the first pole piece (211) and the second pole piece (212) have opposite polarities; and the pole ear portion (22) extends from the first pole piece (211); Wherein, along the thickness direction of the battery cell body (21), the first pole piece (211) includes a plurality of pole piece layers, the pole ear portion (22) includes a plurality of pole ear layers, the total number of the pole ear layers and the total number of the pole piece layers have a ratio of ≥70%, and a / b ≤99.5%.

3. The quadrangular prism battery according to claim 2, characterized in that: The battery core (20) is a wound battery core, and a / b≥35%.

4. The quadrangular prism battery according to claim 2, characterized in that: The battery core (20) is a laminated battery core, and the ratio of the total number of the pole tab layers to the total number of the pole sheet layers is greater than or equal to 100%.

5. The quadrangular prism battery according to claim 1, characterized in that: The ratio of the area enclosed by the circumferential outer edge of one end of the battery cell body (21) facing the first shell end surface (11) to the area enclosed by the circumferential outer edge of the first shell end surface (11) is 90%-99.95%.

6. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The battery housing (10) is provided with at least one of a liquid injection hole (111) and an explosion-proof valve (112); Wherein, at least one of the liquid injection hole (111) and the explosion-proof valve (112) is arranged on the first shell end surface (11).

7. The quadrangular prism battery according to claim 6, characterized in that: The ratio of the dimension a of the pole ear portion (22) to the dimension b of the first shell end surface (11) is ≤85%.

8. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The battery housing (10) further comprises a second housing end surface (12), the second housing end surface (12) being perpendicular to the first housing end surface (11), and at least one of a liquid injection hole (111) and an explosion-proof valve (112) being provided on the second housing end surface (12); The quadrangular prism-type battery further comprises an electrode terminal assembly (30), wherein the electrode terminal assembly (30) is arranged on the second shell end surface (12), and the electrode terminal assembly (30) is electrically connected to the pole ear portion (22).

9. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The thermal conductivity of the battery casing (10) is 10w / (m·k)-90w / (m·k).

10. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The ratio of the wall thickness of the battery housing (10) to the length dimension c of the pole ear portion (22) extending from the battery cell body (21) is 0.1%-2%.

11. The quadrangular prism battery according to any one of claims 1 to 5, characterized in that: The battery housing (10) further comprises a second housing end face (12) and a third housing end face (13), the second housing end face (12) and the third housing end face (13) being connected, and the second housing end face (12) and the third housing end face (13) being connected to the first housing end face (11), the second housing end face (12) and the third housing end face (13) being perpendicular to the first housing end face (11), the area of ​​the third housing end face (13) being greater than the area of ​​the first housing end face (11), the area of ​​the third housing end face (13) being greater than the area of ​​the second housing end face (12), and the thickness of the first housing end face (11) being ≤0.45 mm; The quadrangular prism-type battery further comprises an electrode terminal assembly (30), wherein the electrode terminal assembly (30) is arranged on the first shell end surface (11) or the second shell end surface (12), and the electrode terminal assembly (30) is electrically connected to the pole ear portion (22).

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