Square battery

Abstract

The utility model relates to the technical field of batteries, and provides a square battery which comprises a battery shell which is a steel shell; the first pole assembly is arranged on the first shell section; the battery cell is arranged in the battery shell; the first switching piece and the first pole assembly are connected with the first part, and the first tab is connected with the second part; wherein the area surrounded by the circumferential outer edge of the side, facing the first shell section, of the first part is S1, the area surrounded by the circumferential outer edge of the side, facing the second shell section, of the second part is S2, and S1 / S2 is larger than or equal to 0.5 and smaller than or equal to 6, so that the heat dissipation capacity of the battery cell can be guaranteed, and the heat dissipation efficiency balance of the first shell section and the second shell section can be guaranteed; therefore, the internal heat balance and consistency of the battery are relatively high, and the safety risks such as lithium precipitation caused by local heat production of the battery can be reduced, so that the safe use performance of the square battery is effectively improved.

Description

Technical Field

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

[0002] In the related technology, aluminum shell batteries have relatively excellent thermal conductivity and a faster heat transfer rate between the battery cell and the battery shell. However, the aluminum shell has a higher corrosion risk and weaker strength. The overall safety performance of the battery is significantly improved by using a steel shell instead of an aluminum shell. However, the thermal conductivity of the steel shell is poor, thus affecting the overall fast charging performance of the battery. Utility Model Content

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

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

[0005] A battery housing, the battery housing comprising a first housing section and a second housing section that are perpendicular to each other;

[0006] A first pole assembly, the first pole assembly is arranged on the first housing segment;

[0007] A battery cell is disposed in the battery housing, and comprises a battery cell body and a first pole ear, wherein the first pole ear extends from the battery cell body toward one end of the second housing segment;

[0008] A first adapter plate, the first adapter plate includes a first part and a second part, the first part and the second part have an included angle, and the first part and the second part are respectively arranged opposite to the first shell segment and the second shell segment, the first pole assembly is connected to the first part, and the first pole ear is connected to the second part;

[0009] The battery shell is a steel shell, the area enclosed by the circumferential outer edge of the first part facing the first shell segment is S1, the area enclosed by the circumferential outer edge of the second part facing the second shell segment is S2, and 0.5≤S1 / S2≤6.

[0010] A square battery in one embodiment of the utility model comprises a battery housing, a first pole assembly, a battery cell and a first adapter. The first pole assembly is arranged on the battery housing, the battery cell is arranged in the battery housing, and the first pole assembly is electrically connected to the battery cell through the first adapter. The first pole assembly is arranged on the first shell segment, and the first pole ear extends from the battery body toward one end of the second shell segment, and the first shell segment and the second shell segment are perpendicular to each other, so that the heat generated by the battery can be dispersed, thereby improving the heat dissipation capacity of the battery, and the first part and the second part of the first adapter are arranged opposite to the first shell segment and the second shell segment respectively, the first pole assembly is connected to the first part, and the first pole ear is connected to the second part, the area enclosed by the circumferential outer edge of the first part facing the first shell segment is S1, and the area enclosed by the circumferential outer edge of the second part facing the second shell segment is S2, 0.5≤S1 / S2≤6, which can not only ensure the heat dissipation capacity of the battery cell, but also ensure the balance of heat dissipation efficiency between the first shell segment and the second shell segment, thereby ensuring high internal thermal balance and consistency of the battery, not only ensuring the overall charging and discharging rate and safety performance of the battery, but also reducing the safety risks such as serious local heat generation and lithium plating of the battery, thereby effectively improving the safe use performance of the square battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] 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:

[0012] Figure 1 is a schematic structural diagram of a square battery according to an exemplary embodiment;

[0013] Figure 2 is a schematic diagram of an exploded structure of a square battery according to an exemplary embodiment;

[0014] Figure 3 is a schematic diagram of an exploded structure of a square battery according to another exemplary embodiment;

[0015] Figure 4 is a schematic structural diagram of a square battery cell according to an exemplary embodiment;

[0016] Figure 5 is a schematic structural diagram of a first adapter sheet of a square battery according to an exemplary embodiment;

[0017] Figure 6is a schematic structural diagram of a first adapter plate of a square battery according to another exemplary embodiment.

[0018] The following are the descriptions of the reference numerals:

[0019] 10. Battery case; 11. First case segment; 12. Second case segment; 13. Third case segment; 20. First pole assembly; 30. Battery cell; 31. Battery cell body; 32. First pole ear; 33. Second pole ear; 40. First adapter; 41. First part; 42. Second part; 50. Second pole assembly; 60. Second adapter; 70. Insulation layer. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] An embodiment of the present invention provides a square battery. Figures 1 to 6 The square battery comprises: a battery housing 10, the battery housing 10 comprises a first housing section 11 and a second housing section 12 which are perpendicular to each other; a first pole assembly 20, the first pole assembly 20 is arranged on the first housing section 11; a battery cell 30, the battery cell 30 is arranged in the battery housing 10, the battery cell 30 comprises a battery cell body 31 and a first pole ear 32, the first pole ear 32 extends from the battery cell body 31 toward one end of the second housing section 12; a first adapter 40, the first adapter 40 comprises a first portion 41 and a second portion 42, the first portion 4 1 and the second part 42 have an included angle, and the first part 41 and the second part 42 are respectively arranged opposite to the first shell segment 11 and the second shell segment 12, the first pole assembly 20 is connected to the first part 41, and the first pole ear 32 is connected to the second part 42; wherein, the battery shell 10 is a steel shell, the area enclosed by the circumferential outer edge of the first part 41 on the side facing the first shell segment 11 is S1, the area enclosed by the circumferential outer edge of the second part 42 on the side facing the second shell segment 12 is S2, and 0.5≤S1 / S2≤6.

[0025] A square battery in one embodiment of the utility model includes a battery case 10, a first pole assembly 20, a battery cell 30 and a first adapter 40. The first pole assembly 20 is arranged on the battery case 10, and the battery cell 30 is arranged in the battery case 10. The first pole assembly 20 is electrically connected to the battery cell 30 through the first adapter 40. The first pole assembly 20 is arranged on the first shell segment 11, and the first pole ear 32 extends from the battery body 31 toward one end of the second shell segment 12, and the first shell segment 11 and the second shell segment 12 are perpendicular to each other, so that the heat generated by the battery can be dispersed, thereby improving the heat dissipation capacity of the battery, and the first part 41 and the second part 42 of the first adapter 40 are arranged opposite to the first shell segment 11 and the second shell segment 12 respectively, the first pole assembly 20 is connected to the first part 41, the first pole ear 32 is connected to the second part 42, and the first part 41 is toward the first shell segment 11. The area enclosed by the circumferential outer edge of one side of 1 is S1, and the area enclosed by the circumferential outer edge of the second portion 42 on the side facing the second shell segment 12 is S2, 0.5≤S1 / S2≤6, which can not only ensure the heat dissipation capacity of the battery cell 30, but also ensure the balance of the heat dissipation efficiency of the first shell segment 11 and the second shell segment 12, thereby ensuring the internal thermal balance and consistency of the battery. Not only can the overall charge and discharge rate and safety performance of the battery be guaranteed, but also the safety risks such as serious lithium plating caused by local heat generation of the battery can be reduced, thereby effectively improving the safe use performance of the square battery.

[0026] It should be noted that the battery housing 10 is a steel shell. The battery housing 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.

[0027] Combination Figures 1 to 3 As shown, the battery shell 10 of the square battery includes a first shell segment 11 and a second shell segment 12 that are basically perpendicular to each other, that is, the first shell segment 11 and the second shell segment 12 are arranged adjacent to each other, and the first shell segment 11 and the second shell segment 12 intersect each other, and the first shell segment 11 and the second shell segment 12 are perpendicular to each other when manufacturing errors and deformations are not considered.

[0028] like Figure 2 and Figure 3 As shown, the first pole assembly 20 is arranged on the first shell segment 11, and the battery cell 30 includes a battery cell body 31 and a first pole ear 32. The first pole ear 32 extends from the battery cell body 31 toward one end of the second shell segment 12, that is, when the first pole assembly 20 is located at the top of the battery, the first pole ear 32 is side-exited, so that the heat generated can be dispersed, thereby facilitating the heat dissipation of the square battery, thereby improving the heat dissipation capacity of the square battery.

[0029] Combination Figure 5 and Figure 6 As shown, the first adapter plate 40 includes a first portion 41 and a second portion 42 , and an angle is formed between the first portion 41 and the second portion 42 , so that the first portion 41 and the second portion 42 can be conveniently connected to the first pole assembly 20 and the first pole ear 32 , respectively.

[0030] The area enclosed by the circumferential outer edge of the first portion 41 facing the first housing segment 11 is represented as S1, and the area enclosed by the circumferential outer edge of the second portion 42 facing the second housing segment 12 is represented as S2. Figure 5 shown.

[0031] The battery case 10 is a steel case, and the thermal conductivity of the steel case is relatively low. The area S1 enclosed by the circumferential outer edge of the first part 41 on the side facing the first case segment 11 and the area S2 enclosed by the circumferential outer edge of the second part 42 on the side facing the second case segment 12 are particularly critical to the overall heat dissipation of the battery cell 30. The ratio of the area S1 enclosed by the circumferential outer edge of the first part 41 on the side facing the first case segment 11 to the area S2 enclosed by the circumferential outer edge of the second part 42 on the side facing the second case segment 12 is too small, and the first part 41 is seriously heated, and the heat is too high. The heat dissipation and overcurrent bottlenecks affect the overall charge and discharge rate and safety performance of the battery; the ratio of the area S1 enclosed by the circumferential outer edge of the first part 41 on the side facing the first shell segment 11 to the area S2 enclosed by the circumferential outer edge of the second part 42 on the side facing the second shell segment 12 is too large, and it is difficult to achieve rapid heat dissipation at the end of the battery cell 30, and it is difficult for the second shell segment 12 to quickly dissipate the heat. The heat dissipation efficiency of the first shell segment 11 and the second shell segment 12 is uneven, resulting in poor thermal balance and consistency inside the battery, serious local heat generation, and prone to safety risks such as lithium plating.

[0032] The first pole assembly 20 is arranged on the first shell section 11, and the first pole ear 32 extends from the battery body 31 toward one end of the second shell section 12, that is, the first pole ear 32 of the battery 30 is side-out, and there is an angle between the first part 41 and the second part 42 of the first adapter 40, and the angle between the first part 41 and the second part 42 can be basically 90 degrees, and the first adapter 40 is basically an L-shaped adapter. The side-out battery uses a steel shell as a battery shell, and its thermal conductivity is worse than that of an aluminum shell. Therefore, the two end surface areas of the L-shaped adapter are particularly critical to the overall heat dissipation of the battery. If S1 / S2 is too small, the first part 41 will generate heat seriously, and as a heat dissipation and overcurrent bottleneck, it will affect the overall charge and discharge rate and safety performance of the battery; if S1 / S2 is too large, it is difficult to achieve rapid heat dissipation at the end of the battery, and it is difficult for the second shell section 12 to quickly dissipate the heat. The heat dissipation efficiency of the first shell section 11 and the second shell section 12 is uneven, resulting in poor thermal balance and consistency inside the battery, and serious local heat generation, which is prone to safety risks such as lithium deposition.

[0033] The ratio of an area S1 enclosed by the circumferential outer edge of the first portion 41 on the side facing the first shell segment 11 to an area S2 enclosed by the circumferential outer edge of the second portion 42 on the side facing the second shell segment 12 may be 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.6, 5.8, 5.9 or 6, etc.

[0034] In one embodiment, along the length direction of the first shell segment 11, the ratio of the dimension a of the first adapter plate 40 to the dimension b of the first shell segment 11 is 2.5-5, and the thickness of the battery shell 10 is less than or equal to 0.4 mm. This can not only ensure the current transmission rate and heat dissipation efficiency of the first part 41, but also avoid the problem of excessive size of the first adapter plate 40 and uneven heat dissipation between the first shell segment 11 and the second shell segment 12. In addition, the heat dissipation inside the battery shell 10 can be facilitated by controlling the thickness of the battery shell 10, thereby improving the overall heat dissipation capacity of the battery.

[0035] Combination Figure 1 As shown, along the length direction of the first shell segment 11, the size of the first shell segment 11 can be expressed as b. Figure 6 As shown, the dimension of the first adapter plate 40 can be represented as a. The ratio of the dimension a of the first adapter plate 40 to the dimension b of the first housing segment 11 can be 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8 or 5, etc.

[0036] In one embodiment, along the length direction of the first shell segment 11, the distance between the first pole assembly 20 and the circumferential outer edge of the first shell segment 11 is 5mm-50mm, which can not only effectively control the heat dissipation capacity of the battery cell 30, but also ensure the overall force-bearing capacity of the first shell segment 11, thereby ensuring the safe use performance of the square battery.

[0037] Along the length direction of the first shell segment 11, the distance between the first pole assembly 20 and the circumferential outer edge of the first shell segment 11 is too far, which will cause the first adapter plate 40 to be far away from the battery shell 10, affecting the heat dissipation efficiency between the battery cell 30 and the battery shell 10; the distance between the first pole assembly 20 and the circumferential outer edge of the first shell segment 11 is too small, the end of the first shell segment 11 is subjected to force, and the surface flatness and strength are poor.

[0038] The first portion of the first pole assembly 20 may be located inside the battery housing 10, and the second portion of the first pole assembly 20 may be located outside the battery housing 10. Along the length direction of the first housing segment 11, the distance between the first pole assembly 20 and the circumferential outer edge of the first housing segment 11 may be the distance between the first portion and the circumferential outer edge of the first housing segment 11, or the distance between the first pole assembly 20 and the circumferential outer edge of the first housing segment 11 may be the minimum distance between the second portion and the circumferential outer edge of the first housing segment 11.

[0039] Along the length direction of the first housing segment 11, the distance between the first pole assembly 20 and the circumferential outer edge of the first housing segment 11 can be 5mm, 5.5mm, 5.8mm, 6mm, 6.5mm, 6.8mm, 7mm, 7.5mm, 7.8mm, 8mm, 8.5mm, 8.8mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, 12.5mm, 13mm, 13.5mm, 14mm, 14.5mm, 15mm, 15.5mm, 16mm, 16.5mm, 17mm, 17.5mm, 18mm, 19mm, 20mm, 21mm, 22mm, 23mm, 24mm, 25mm, 26mm, 27mm, 28mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm or 50mm and so on.

[0040] In one embodiment, along the thickness direction of the first shell segment 11, the ratio of the dimension c of the first adapter plate 40 to the height dimension d of the battery cell body 31 is 0.009-0.05. On the basis of ensuring the overall heat dissipation efficiency of the square battery, it is also possible to avoid the first adapter plate 40 being too large in size, occupying a larger space inside the square battery, and thus affecting the overall energy density of the square battery.

[0041] Combination Figure 4 As shown, along the thickness direction of the first shell segment 11, the height dimension of the battery cell body 31 can be expressed as d. Figure 6 As shown, the size of the first adapter plate 40 can be expressed as c. The ratio of the size c of the first adapter plate 40 to the height size d of the battery cell body 31 can be 0.009, 0.01, 1.012, 0.015, 0.018, 0.02, 0.025, 0.028, 0.03, 0.035, 0.038, 0.04, 0.045, 0.048 or 0.05, etc.

[0042] In one embodiment, along the thickness direction of the first shell segment 11, the dimension c of the first adapter plate 40 is 1mm-5mm, so as to ensure the flow energy of the first adapter plate 40, ensure the heat dissipation energy of the first adapter plate 40, and also control the dimension of the first adapter plate 40 to further control the space occupancy rate of the first adapter plate 40.

[0043] Along the thickness direction of the first shell segment 11 , a dimension c of the first adapter plate 40 may be 1 mm, 1.5 mm, 1.8 mm, 2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.5 mm, 3.8 mm, 4 mm, 4.5 mm, 4.8 mm or 5 mm, etc.

[0044] It should be noted that, combined with Figure 1 As shown, the length direction of the first shell segment 11 can be represented as A, and the thickness direction of the first shell segment 11 can be represented as B.

[0045] In one embodiment, the wall thickness of the battery housing 10 is 0.05mm-0.4mm, which can not only effectively control the structural strength of the battery housing 10, but also make the weight of the battery housing 10 relatively small, which is beneficial to improving the energy density of the square battery, and can also be beneficial to the heat dissipation of the square battery, thereby improving the safe use performance of the square battery.

[0046] The wall thickness of the battery housing 10 can be 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.2mm, 0.21mm, 0.22mm, 0.24mm, 0.25mm, 0.26mm, 0.27mm, 0.28mm, 0.3mm, 0.31mm, 0.32mm, 0.34mm, 0.35mm, 0.36mm, 0.37mm, 0.38mm or 0.4mm, etc.

[0047] In one embodiment, Figures 1 to 4 As shown, the battery cell 30 also includes a second pole ear 33, the polarities of the first pole ear 32 and the second pole ear 33 are opposite, and the first pole ear 32 and the second pole ear 33 extend from opposite ends of the battery cell body 31, and the square battery also includes: a second pole column assembly 50, and the second pole column assembly 50 is arranged on the first shell segment 11; a second adapter plate 60, and the second pole ear 33 is connected to the second pole column assembly 50 through the second adapter plate 60, so that the square battery can be conveniently charged and discharged through the first pole column assembly 20 and the second pole column assembly 50, thereby facilitating the grouping of the square batteries.

[0048] The opposite ends of the battery cell body 31 have a first pole ear 32 and a second pole ear 33, and the first pole column assembly 20 and the second pole column assembly 50 are both arranged on the first shell segment 11, so that they need to be electrically connected to the first pole ear 32 and the second pole ear 33 through the first adapter plate 40 and the second adapter plate 60 respectively.

[0049] In one embodiment, one of the first pole ear 32 and the second pole ear 33 is a positive pole ear, and the other is a negative pole ear, one of the first adapter plate 40 and the second adapter plate 60 is a positive adapter plate, and the other is a negative adapter plate; wherein, the ratio of the area enclosed by the circumferential outer edge of the positive electrode adapter plate on the side away from the battery cell 30 to the area enclosed by the circumferential outer edge of the negative electrode adapter plate on the side away from the battery cell 30 is 1.01-1.5, which can not only improve the performance of the square battery, but also be beneficial to the heat dissipation of the square battery, thereby improving the safe performance of the square battery.

[0050] The positive and negative electrodes of the battery cell 30 have different electrochemical systems. The discharge and lithium insertion of the positive electrode is an exothermic reaction, which requires lower heat to facilitate the insertion rate of lithium ions (it is easy to be deactivated under high temperature conditions, mainly nickel), while the charging process of the negative electrode is an endothermic reaction, which requires higher heat to facilitate the insertion rate of lithium ions (graphite promotes electrochemical reactions and has good high-temperature kinetic properties). Therefore, the positive electrode has a greater heat dissipation demand, and the positive electrode plate of the battery cell 30 may include aluminum, and the negative electrode plate of the battery cell 30 may include copper. The thermal conductivity of aluminum is relatively poor compared to that of copper. Therefore, the area of ​​the positive electrode adapter sheet is larger than that of the negative electrode adapter sheet, and the ratio of the area of ​​the positive electrode adapter sheet to the area of ​​the negative electrode adapter sheet is controlled within a certain range to avoid a large difference in thermal stability between the positive electrode plate and the negative electrode plate of the battery cell 30.

[0051] The ratio of the area enclosed by the circumferential outer edge of the positive electrode adapter sheet on the side facing away from the battery cell 30 to the area enclosed by the circumferential outer edge of the negative electrode adapter sheet on the side facing away from the battery cell 30 can be 1.01, 1.02, 1.05, 1.08, 1.1, 1.11, 1.12, 1.15, 1.18, 1.2, 1.21, 1.22, 1.25, 1.28, 1.3, 1.31, 1.32, 1.35, 1.38, 1.4, 1.41, 1.42, 1.45, 1.48 or 1.5, etc.

[0052] In one embodiment, one of the first pole ear 32 and the second pole ear 33 is a positive pole ear, and the other is a negative pole ear, one of the first adapter sheet 40 and the second adapter sheet 60 is a positive adapter sheet, and the other is a negative adapter sheet; wherein, the ratio of the thickness of the positive adapter sheet to the thickness of the negative adapter sheet is 1.05-2, and on the basis of ensuring the current capacity of the positive adapter sheet and the negative adapter sheet, it can also be ensured that the positive adapter sheet and the negative adapter sheet can have a relatively balanced heat dissipation capacity, thereby effectively controlling the overall heat dissipation capacity of the square battery and improving the safe use performance of the square battery.

[0053] The first electrode tab 32 may be a positive electrode tab, the second electrode tab 33 may be a negative electrode tab, the positive electrode tab may be an aluminum foil, the negative electrode tab may be a copper foil, the first adapter 40 and the second adapter 60 may be an aluminum plate and a copper plate respectively. The first pole assembly 20 and the second pole assembly 50 may include aluminum and copper respectively.

[0054] The ratio of the thickness of the positive electrode adapter sheet to the thickness of the negative electrode adapter sheet can be 1.05, 1.08, 1.1, 1.11, 1.12, 1.15, 1.18, 1.2, 1.21, 1.22, 1.25, 1.28, 1.3, 1.31, 1.32, 1.35, 1.38, 1.4, 1.41, 1.42, 1.45, 1.4 8, 1.5, 1.51, 1.52, 1.55, 1.58, 1.6, 1.61, 1.62, 1.65, 1.68, 1.7, 1.71, 1.72, 1.75, 1.78, 1.8, 1.81, 1.82, 1.85, 1.88, 1.9, 1.91, 1.92, 1.95, 1.98 or 2, etc.

[0055] In one embodiment, Figure 3 As shown, the square battery also includes an insulating layer 70, which is disposed between the first adapter plate 40 and the battery housing 10, thereby effectively preventing insulation risks between the first adapter plate 40 and the battery housing 10, thereby improving the safe use performance of the square battery.

[0056] The insulating layer 70 may be an insulating film, or an insulating coating. For example, the insulating layer 70 may be an insulating film, and the insulating film may be disposed on the battery housing 10; or the insulating film may be disposed on the first adapter sheet 40, and at least a portion of the insulating film may be located between the second housing segment 12 and the second portion 42.

[0057] In one embodiment, the first pole ear 32 is a positive pole ear, the first adapter sheet 40 is a positive adapter sheet, and the insulating layer 70 can be located between the positive adapter sheet and the battery shell 10. Considering that the corrosion potential of the steel shell is high, and when the positive adapter sheet and the battery shell 10 are overlapped, the corrosion of the battery shell 10 is more serious. Therefore, the setting of the insulating layer 70 can effectively improve the insulation capacity between the positive adapter sheet and the battery shell 10.

[0058] In one embodiment, the thickness of the insulating layer 70 is ≤60 microns. On the basis of ensuring the insulating ability of the insulating layer 70 , it is possible to avoid the insulating layer 70 being too thick to occupy a large space inside the square battery.

[0059] The thickness of the insulating layer 70 may be 60 micrometers, 58 micrometers, 55 micrometers, 50 micrometers, 48 ​​micrometers, 45 micrometers, 40 micrometers, 30 micrometers, etc.

[0060] In one embodiment, Figures 1 to 3 As shown, the battery housing 10 also includes a third housing segment 13, which is connected to the first housing segment 11, and the third housing segment 13 is connected to the second housing segment 12. The area of ​​the third housing segment 13 is greater than the area of ​​the first housing segment 11, and the area of ​​the third housing segment 13 is greater than the area of ​​the second housing segment 12, that is, the third housing segment 13 of the battery housing 10 can be arranged relative to the large surface of the battery cell 30, which can not only improve the space utilization of the battery housing 10, but also be beneficial to the overall heat dissipation of the battery cell 30, thereby balancing the temperature of the battery cell 30 and improving the safe use performance of the square battery.

[0061] In one embodiment, the first shell segment 11 and the second shell segment 12 are welded together, that is, the first shell segment 11 and the second shell segment 12 are independent parts, which can facilitate the installation of the battery cell 30 and ensure the connection stability between the first shell segment 11 and the second shell segment 12.

[0062] The first shell segment 11 and the second shell segment 12 may be connected by laser welding, or the first shell segment 11 and the second shell segment 12 may be connected by resistance welding, or the first shell segment 11 and the second shell segment 12 may be connected by ultrasonic welding, etc.

[0063] The first housing section 11 may be a cover of the battery housing 10 , while the second housing section 12 may belong to a housing part of the battery housing 10 .

[0064] It should be noted that the square battery includes a battery cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charging / discharging. The battery cell 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.

[0065] The shape of a square battery is similar to a rectangle, that is, a square battery can be called a rectangular battery. Furthermore, a square battery can be called a quadrangular prism battery. A quadrangular prism 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.

[0066] 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, which has a first pole piece stacked on top of 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.

[0067] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0068] An embodiment of the present invention further provides a battery pack, comprising the above-mentioned square battery.

[0069] The square battery of a battery pack of one embodiment of the utility model comprises a battery housing 10, a first pole assembly 20, a battery cell 30 and a first adapter 40, wherein the first pole assembly 20 is arranged on the battery housing 10, the battery cell 30 is arranged in the battery housing 10, and the first pole assembly 20 is electrically connected to the battery cell 30 through the first adapter 40. The first pole assembly 20 is arranged on the first housing segment 11, and the first pole ear 32 extends from the battery cell body 31 toward one end of the second housing segment 12, and the first housing segment 11 and the second housing segment 12 are perpendicular to each other, so that the heat generated by the battery can be dispersed, thereby improving the heat dissipation capacity of the battery, and the first part 41 and the second part 42 of the first adapter 40 are arranged opposite to the first housing segment 11 and the second housing segment 12 respectively, the first pole assembly 20 is connected to the first part 41, the first pole ear 32 is connected to the second part 42, and the first part 41 is toward the first housing segment 11. The area enclosed by the circumferential outer edge of one side of 1 is S1, and the area enclosed by the circumferential outer edge of the second part 42 on the side facing the second shell segment 12 is S2, 0.5≤S1 / S2≤6, which can not only ensure the heat dissipation capacity of the battery cell 30, but also ensure the balance of the heat dissipation efficiency of the first shell segment 11 and the second shell segment 12, thereby ensuring the internal thermal balance and consistency of the battery. Not only can the overall charge and discharge rate and safety performance of the battery be guaranteed, but also the safety risks such as serious lithium plating caused by local heat generation of the battery can be reduced, thereby effectively improving the safe use performance of the battery pack.

[0070] In one embodiment, the battery pack is a battery module or a battery pack.

[0071] The battery module includes a plurality of square batteries, and 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 square batteries.

[0072] It should be noted that multiple square batteries can be formed into a battery module and then placed in a battery box, and multiple square batteries can be fixed by end plates and side plates. Multiple square batteries can be directly placed in the battery box, that is, there is no need to group multiple square batteries, in which case the end plates and side plates can be removed.

[0073] 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.

[0074] 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 square battery, characterized in that: include: A battery housing (10), the battery housing (10) comprising a first housing section (11) and a second housing section (12) which are perpendicular to each other; A first pole assembly (20), wherein the first pole assembly (20) is arranged on the first housing segment (11); A battery cell (30), the battery cell (30) being arranged in the battery casing (10), the battery cell (30) comprising a battery cell body (31) and a first pole lug (32), the first pole lug (32) extending from the battery cell body (31) toward one end of the second casing segment (12); A first adapter plate (40), the first adapter plate (40) comprising a first portion (41) and a second portion (42), the first portion (41) and the second portion (42) having an included angle therebetween, and the first portion (41) and the second portion (42) being arranged opposite to the first housing segment (11) and the second housing segment (12) respectively, the first pole assembly (20) being connected to the first portion (41), and the first pole lug (32) being connected to the second portion (42); The battery shell (10) is a steel shell, the area enclosed by the circumferential outer edge of the first part (41) on the side facing the first shell segment (11) is S1, the area enclosed by the circumferential outer edge of the second part (42) on the side facing the second shell segment (12) is S2, and 0.5≤S1 / S2≤6.

2. The square battery according to claim 1, characterized in that: Along the length direction of the first shell section (11), the ratio of the dimension a of the first adapter plate (40) to the dimension b of the first shell section (11) is 2.5-5, and the thickness of the battery shell (10) is less than or equal to 0.4 mm.

3. The square battery according to claim 1, characterized in that: Along the length direction of the first housing segment (11), the distance between the first pole assembly (20) and the circumferential outer edge of the first housing segment (11) is 5 mm-50 mm.

4. The square battery according to claim 1, characterized in that: Along the thickness direction of the first shell segment (11), the ratio of the dimension c of the first adapter sheet (40) to the height dimension d of the battery cell body (31) is 0.009-0.

05.

5. The square battery according to claim 4, characterized in that: Along the thickness direction of the first shell segment (11), a dimension c of the first adapter plate (40) is 1 mm-5 mm.

6. The square battery according to any one of claims 1 to 5, characterized in that: The battery cell (30) further comprises a second pole ear (33), the first pole ear (32) and the second pole ear (33) have opposite polarities, the first pole ear (32) and the second pole ear (33) extend from opposite ends of the battery cell body (31), and the square battery further comprises: A second pole assembly (50), the second pole assembly (50) being arranged on the first housing segment (11); A second adapter plate (60), wherein the second pole lug (33) is connected to the second pole column assembly (50) via the second adapter plate (60).

7. The square battery according to claim 6, characterized in that: One of the first adapter plate (40) and the second adapter plate (60) is a positive electrode adapter plate, and the other is a negative electrode adapter plate; The ratio of the area enclosed by the circumferential outer edge of the positive electrode adapter sheet on the side away from the battery cell (30) to the area enclosed by the circumferential outer edge of the negative electrode adapter sheet on the side away from the battery cell (30) is 1.01-1.

5.

8. The square battery according to claim 6, characterized in that: One of the first adapter plate (40) and the second adapter plate (60) is a positive electrode adapter plate, and the other is a negative electrode adapter plate; Wherein, the ratio of the thickness of the positive electrode adapter sheet to the thickness of the negative electrode adapter sheet is 1.05-2.

9. The square battery according to any one of claims 1 to 5, characterized in that: The square battery further comprises an insulating layer (70), wherein the insulating layer (70) is arranged between the first adapter plate (40) and the battery housing (10); wherein the thickness of the insulating layer (70) is ≤60 micrometers.

10. The square battery according to any one of claims 1 to 5, characterized in that: The battery housing (10) further comprises a third housing segment (13), the third housing segment (13) being connected to the first housing segment (11), the third housing segment (13) being connected to the second housing segment (12), the area of ​​the third housing segment (13) being greater than the area of ​​the first housing segment (11), and the area of ​​the third housing segment (13) being greater than the area of ​​the second housing segment (12); And / or, the first shell segment (11) and the second shell segment (12) are connected by welding.

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