Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery cell, the pole structure is electrically connected with the battery cell, and the area of the end face, facing the battery cell, of the pole structure is S1; the battery core is arranged in the battery shell, a pole through hole is formed in the battery shell, at least part of the pole structure is arranged in the pole through hole in a penetrating manner, and the area of the pole through hole is greater than or equal to S1; wherein one end, facing the battery cell, of the pole structure protrudes out of the inner surface of the battery shell, the size of the pole structure protruding out of the inner surface is a1, and S1 / a1 is 7 mm-19000 mm, so that the pole structure can be conveniently connected with the battery cell, the overall assembly efficiency is improved, meanwhile, the creepage distance between the battery cell and the battery shell can be increased, and the risk of short circuit in the battery is reduced; and the connection stability of the pole structure and the battery cell can be ensured, and the risk of connection failure is reduced, so that the safe use performance of the battery is improved.

Description

Technical Field

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

[0002] In the related art, a battery may include a battery case, a battery cell and a pole structure. The pole structure may be disposed on the battery case to achieve electrical connection with the pole structure located inside the battery case. However, due to the structural form limitations of the pole structure, it may be inconvenient to connect the pole structure to the battery cell. Utility Model Content

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

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

[0005] Battery cells;

[0006] A pole structure, the pole structure is electrically connected to the battery cell, and the end surface area of ​​the pole structure facing the battery cell is S1;

[0007] A battery housing, wherein the battery cell is disposed in the battery housing, wherein a pole through hole is disposed on the battery housing, wherein at least part of the pole structure is penetrated in the pole through hole, and an area of ​​the pole through hole is greater than or equal to S1;

[0008] The pole structure is arranged to protrude from the inner surface of the battery shell toward one end of the battery cell, and the size of the pole structure protruding from the inner surface is a1, and S1 / a1 is 7mm-19000mm.

[0009] The battery of the utility model embodiment includes a battery cell, a pole structure and a battery shell, wherein the battery cell is arranged in the battery shell, and the battery cell is electrically connected to the pole structure arranged on the battery shell. The end surface area of ​​the pole structure facing the battery cell is S1, and the area of ​​the pole through hole on the battery shell is greater than or equal to S1, so that the pole structure can be conveniently passed through the pole through hole, and the pole structure is arranged to protrude from the inner surface of the battery shell toward one end of the battery cell, thereby facilitating the connection between the pole structure and the battery cell, and the size of the pole structure protruding from the inner surface is a1, S1 / a1 is 7mm-19000mm, which not only facilitates the connection between the pole structure and the battery cell, but also improves the overall assembly efficiency, and at the same time can increase the creepage distance between the battery cell and the battery shell, reduce the risk of short circuit in the battery, and can also ensure the connection stability between the pole structure and the battery cell, reduce the risk of failure of the connection between the pole structure and the battery cell, avoid stress concentration after the battery cell and the pole structure are connected, thereby improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0011] Figure 1 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

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

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

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

[0015] Figure 5 is a schematic diagram of a partial structure of a battery cell according to an exemplary embodiment.

[0016] The following are the descriptions of the reference numerals:

[0017] 10. Battery cell; 11. Battery cell body; 12. Ear; 121. Weld mark; 122. First weld mark area; 123. Second weld mark area; 20. Pole structure; 21. Groove; 22. End face; 221. Bump; 30. Battery case; 31. Pole through hole; 32. Inner surface; 33. Depression; 34. Fixing part; 341. Connecting section; 342. Pressing section; 40. Shielding member; 50. Insulating member. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 5 The battery comprises: a battery cell 10; a pole structure 20, the pole structure 20 is electrically connected to the battery cell 10, and the area of ​​the end face 22 of the pole structure 20 facing the battery cell 10 is S1; a battery shell 30, the battery cell 10 is arranged in the battery shell 30, and a pole through hole 31 is provided on the battery shell 30, at least part of the pole structure 20 is penetrated in the pole through hole 31, and the area of ​​the pole through hole 31 is greater than or equal to S1; wherein, the pole structure 20 is arranged to protrude from the inner surface 32 of the battery shell 30 at one end facing the battery cell 10, and the size of the pole structure 20 protruding from the inner surface 32 is a1, and S1 / a1 is 7mm-19000mm.

[0023] A battery according to an embodiment of the present invention comprises a battery cell 10 , a pole structure 20 and a battery housing 30 . The battery cell 10 is disposed in the battery housing 30 , and the battery cell 10 is electrically connected to the pole structure 20 disposed on the battery housing 30 . The area of ​​the end face 22 of the pole structure 20 facing the battery cell 10 is S1, and the area of ​​the pole through hole 31 on the battery shell 30 is greater than or equal to S1, so that the pole structure 20 can easily pass through the pole through hole 31, and the pole structure 20 is protruded from the inner surface 32 of the battery shell 30 at one end facing the battery cell 10, thereby facilitating the connection between the pole structure 20 and the battery cell 10, and the size of the protruding inner surface 32 of the pole structure 20 is a1, S1 / a1 is 7mm-19000mm, which not only facilitates the connection between the pole structure 20 and the battery cell 10 and improves the overall assembly efficiency, but also increases the creepage distance between the battery cell 10 and the battery shell 30, reduces the risk of short circuit in the battery, and can also ensure the connection stability between the pole structure 20 and the battery cell 10, reduce the risk of connection failure, thereby improving the safe use performance of the battery.

[0024] It should be noted that, combined with Figure 1 As shown, the pole structure 20 has an end face 22 facing the battery cell 10, that is, the end face 22 can be protruded from the inner surface 32 of the battery housing 30. By making the pole structure 20 protrude from the inner surface 32 of the battery housing 30 at one end of the battery cell 10, the electrical connection between the end face 22 and the battery cell 10 can be easily achieved. In addition, since the pole structure 20 protrudes from the inner surface 32 of the battery housing 30, the distance between the battery cell 10 and the inner surface 32 of the battery housing 30 can be relatively large, thereby increasing the creepage distance between the battery cell 10 and the battery housing 30 and reducing the risk of short circuit in the battery. The inner surface 32 of the battery housing 30 is the surface of the battery housing 30 where the pole structure 20 is provided closest to the battery cell 10.

[0025] Combination Figure 1 As shown, the dimension of the pole structure 20 protruding from the inner surface 32 can be represented as a1. Figure 2 As shown, the area of ​​the end face 22 of the pole structure 20 facing the battery cell 10 can be expressed as S1. The ratio of the area S1 of the end face 22 of the pole structure 20 facing the battery cell 10 to the dimension a1 of the protruding inner surface 32 of the pole structure 20 is too large, the creepage distance between the battery cell 10 and the battery case 30 may be insufficient, and the risk of short circuit is aggravated. However, the ratio of the area S1 of the end face 22 of the pole structure 20 facing the battery cell 10 to the dimension a1 of the protruding inner surface 32 of the pole structure 20 is too small, the stress of the end face 22 of the pole structure 20 is concentrated, the stability of the connection structure between the battery cell 10 and the pole structure 20 is weak, and the stress concentration of the pole structure 20 leads to an increased risk of connection failure with the battery case 30 and the battery cell 10, which is not conducive to improving the safe use performance of the battery.

[0026] The ratio of the area S1 of the end surface 22 of the pole structure 20 facing the battery cell 10 to the size a1 of the protruding inner surface 32 of the pole structure 20 can be 7mm, 10mm, 20mm, 30mm, 50mm, 80mm, 100mm, 150mm, 200mm, 250mm, 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, 1200mm, 1300mm, 1400mm, 150 0mm, 1600mm, 1700mm, 1800mm, 2000mm, 2500mm, 2800mm, 3000mm, 4000mm, 5000mm, 6000mm, 7000mm, 8000mm, 9000mm, 10000mm, 11000mm, 12000mm, 13000mm, 14000mm, 15000mm, 16000mm, 17000mm, 18000mm, or 19000mm, etc.

[0027] The area of ​​the pole through hole 31 is greater than or equal to the area S1 of the end surface 22 of the pole structure 20 facing the battery cell 10 , thereby ensuring that the pole structure 20 can pass through the pole through hole 31 , so that the pole structure 20 protrudes from the inner surface 32 , thereby facilitating the installation of the pole structure 20 .

[0028] In one embodiment, the area of ​​the end surface 22 of the pole structure 20 facing the battery cell 10 is S1, and S1 is 20 mm 2 -2000mm 2 It can not only effectively ensure the connection area between the pole structure 20 and the battery cell 10, thereby ensuring the current carrying capacity between the pole structure 20 and the battery cell 10, but also effectively control the internal space occupancy rate of the battery housing 30 by the pole structure 20.

[0029] The area S1 of the end surface 22 of the pole structure 20 facing the battery cell 10 can be 20 mm 2 , 22mm 2 , 25mm 2 、28mm 2 , 30mm 2 、32mm 2 , 35mm 2 、38mm 2 , 40mm 2 、42mm 2 , 45mm 2 、48mm 2 , 50mm 2 、52mm 2 , 55mm 2 、58mm 2 、60mm2 、62mm 2 、65mm 2 、68mm 2 、70mm 2 、80mm 2 、90mm 2 、100mm 2 、110mm 2 、120mm 2 、140mm 2 、150mm 2 、160mm 2 、170mm 2 、180mm 2 、190mm 2 、200mm 2 、210mm 2 、220mm 2 、240mm 2 、250mm 2 、260mm 2 、270mm 2 、280mm 2 、290mm 2 、300mm 2 、310mm 2 、320mm 2 、340mm 2 、350mm 2 、360mm 2 、370mm 2 、380mm 2 、390mm 2 、400mm 2 、410mm 2 、420mm 2 、440mm 2 、450mm 2 、460mm 2 、470mm 2 、480mm 2 、490mm 2 、500mm 2 、510mm 2 、520mm 2 、540mm 2 、550mm 2 、560mm 2 、570mm 2 、580mm 2 、590mm 2 、600mm 2 、700mm2 、750mm 2 , 800mm 2 、850mm 2 , 900mm 2 、950mm 2 , 1000mm 2 、1050mm 2 、1100mm 2 , 120mm 2 、1300mm 2 、1400mm 2 、1500mm 2 、1600mm 2 、1700mm 2 、1800mm 2 、1900mm 2 or 2000mm 2 etc.

[0030] In one embodiment, the size of the protruding inner surface 32 of the pole structure 20 is a1, and a1 is 0.1mm-3mm. This not only facilitates the connection between the pole structure 20 and the battery cell 10, but also avoids the problem of low internal space utilization of the battery casing 30 caused by the protruding inner surface 32 of the pole structure 20 being too large.

[0031] The dimension a1 of the protruding inner surface 32 of the pole structure 20 can be 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm, etc.

[0032] In one embodiment, Figure 1 and Figure 3 As shown, a groove 21 is formed on the side of the pole structure 20 facing away from the battery cell 10 , thereby facilitating the pole structure 20 to be disposed protruding from the inner surface 32 and effectively controlling the overall weight of the pole structure 20 .

[0033] In one embodiment, Figure 1 and Figure 3 As shown, the battery also includes a shielding member 40, which is disposed in the groove 21, which can not only increase the structural strength of the pole structure 20, but also increase the heat dissipation capacity of the pole structure 20, thereby facilitating the subsequent electrical connection between the pole structure 20 and the busbar.

[0034] The shielding member 40 may be connected to the pole structure 20 by welding, and when the batteries are grouped, the busbar may be connected to the shielding member 40 by welding.

[0035] In one embodiment, Figures 3 to 5 As shown, the battery cell 10 includes a battery cell body 11 and a pole ear 12, and the pole ear 12 is directly connected to the pole column structure 20, and S1 / a1 is 8mm-17500mm, which can not only improve the overall space utilization rate inside the battery, but also the protruding inner surface 32 of the pole column structure 20 can facilitate the rapid assembly of the pole ear 12 and the pole column structure 20, avoiding the risk of tearing caused by the pole ear 12 being inserted into the battery shell 30.

[0036] The protruding inner surface 32 of the pole structure 20 is set to facilitate the direct electrical connection between the pole lug 12 and the pole structure 20, and avoid bending of the pole lug 12. Therefore, the size a1 of the protruding inner surface 32 of the pole structure 20 can be set to a larger size to achieve a quick connection between the pole lug 12 and the pole structure 20. However, the size a1 of the protruding inner surface 32 of the pole structure 20 cannot be too large, and the ratio of the area S1 of the end face 22 of the pole structure 20 facing the battery cell 10 to the size a1 of the protruding inner surface 32 of the pole structure 20 cannot be too small, otherwise the strength will be unstable, and the end face 22 area of ​​the pole structure 20 connected to the pole lug 12 is small and stress concentration is easy. By making S1 / a1 8mm-17500mm, the connection strength between the pole structure 20 and the pole lug 12 can be guaranteed.

[0037] The pole tab 12 is directly connected to the pole structure 20, that is, the pole tab 12 is directly fixedly connected to the pole structure 20, and no other separate electrical connection structure such as an adapter is provided between the pole tab 12 and the pole structure 20. The pole tab 12 and the pole structure 20 are directly connected by welding, bonding or riveting, and the welding can be one or more combinations of resistance welding, ultrasonic welding, laser welding, and torque welding.

[0038] In one embodiment, the pole tab 12 is connected to the pole structure 20 by welding, thereby ensuring the connection stability between the pole tab 12 and the pole structure 20 and quickly realizing the connection between the pole tab 12 and the pole structure 20 .

[0039] The resistance welding connection between the pole ear 12 and the pole structure 20 can reduce the difficulty of welding between the pole ear 12 and the pole structure 20. The thickness difference between the pole ear 12 and the pole structure 20 is large, and the risk of welding through by laser welding is large, while the connection stability of ultrasonic welding is weak. Therefore, the resistance welding between the pole ear 12 and the pole structure 20 can effectively improve the welding quality and welding efficiency.

[0040] The pole lug 12 is connected to the pole column structure 20 by resistance welding, and S1 / a1 is greater than 8 mm, that is, resistance welding realizes rapid electrical connection between the protruding pole column structure 20 and the pole lug 12 of the battery cell 10. A larger size of S1 / a1 can avoid excessive protrusion of the pole column structure 20, too slow resistance welding rate of the pole column structure 20 being too thick, and too slow melting rate of the pole column structure 20.

[0041] In one embodiment, Figure 2 As shown, the end face 22 of the pole structure 20 close to the battery cell 10 is provided with at least two protrusions 221, and the protrusions 221 are welded to the pole lug 12, and the spacing between at least two adjacent protrusions 221 is 0.01mm-10mm. The arrangement of the protrusions 221 can not only ensure that there is a sufficient contact area between the pole structure 20 and the pole lug 12, and ensure the connection stability between the pole structure 20 and the pole lug 12, but also can conveniently form a welding connection between the protrusion 221 and the pole lug 12 by resistance welding. While ensuring the spacing between two adjacent protrusions 221 can ensure the welding connection strength between the protrusion 221 and the pole lug 12, it can also avoid the protrusions 221 being too close to increase the manufacturing cost of the pole structure 20.

[0042] The spacing between two adjacent bumps 221 can be 0.01mm, 0.02mm, 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 9.8mm or 10mm, etc.

[0043] In one embodiment, the pole tab 12 is connected to the pole structure 20 by ultrasonic welding. On the basis of ensuring reliable connection between the pole tab 12 and the pole structure 20 , the pole tab 12 can also be prevented from being welded through, thereby ensuring the connection strength between the pole tab 12 and the pole structure 20 .

[0044] Compared with laser welding, ultrasonic welding generates less heat, and therefore can effectively reduce the risk of the tab 12 being welded through.

[0045] In one embodiment, Figure 4As shown, the pole ear 12 and the pole structure 20 are ultrasonically welded to form a weld mark 121, and the penetration depth of the weld mark 121 is 0.1mm-1.5mm. If the penetration depth of the weld mark 121 is too small, the connection strength between the pole structure 20 and the pole ear 12 is weak, and the current transmission of the battery cell 10 is blocked; if the penetration depth of the weld mark 121 is too large, the ultrasonic welding generates a lot of heat, and the pole ear 12 is easily welded through, resulting in the risk of serious heat generation and melting of the pole ear 12.

[0046] The penetration depth of the weld mark 121 can be 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm or 1.5 mm, etc.

[0047] In one embodiment, Figure 4 As shown, the pole ear 12 and the pole column structure 20 are ultrasonically welded to form a weld mark 121, and the weld mark 121 is a ball tooth weld mark. The diameter of the ball tooth is 0.1mm-3mm. The formation of the ball tooth weld mark can avoid stress concentration during welding of the pole ear 12 and breakage of the pole ear 12. The larger the diameter of the ball tooth, the smaller the contact area between the single-piece pole ear and the single-piece pole ear, the current is blocked and the problem of cold welding is prone to occur; if the diameter of the ball tooth is too small, the stress is concentrated, the pole ear 12 is directly connected to the pole column structure 20 and directly subjected to force, and the risk of tearing of the pole ear 12 increases.

[0048] The diameter of the ball teeth of the ball tooth weld can be 0.1mm, 0.15mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm, etc.

[0049] Figure 4 A schematic diagram of the connection between the pole ear 12 and the pole structure 20 is shown, wherein the position between the battery cell 10 and the pole structure 20 is expanded and displayed.

[0050] In one embodiment, Figure 5As shown, the pole lug 12 is welded to the pole column structure 20 to form a first weld print area 122 and a second weld print area 123 on the surface of the pole lug 12, the area of ​​the second weld print area 123 is smaller than the first weld print area 122, and the second weld print area 123 is located in the first weld print area 122 along the orthographic projection of the surface where the first weld print area 122 is located, and the ratio of the area of ​​the second weld print area 123 to the area of ​​the first weld print area 122 is 0.1-0.8, which can not only ensure the connection strength between the pole lug 12 and the pole column structure 20, reduce the risk of connection failure between the pole lug 12 and the pole column structure 20, but also reduce the risk of welding through the pole lug 12, thereby ensuring the current capacity between the pole lug 12 and the pole column structure 20.

[0051] After the first weld print area 122 of the pre-welding area is formed on the surface of the pole lug 12, it is welded to the pole structure 20 to form the second weld print area 123, which improves the welding yield of the pole lug 12 itself and ensures the welding strength of the pole lug 12 and the pole structure 20, so as to avoid that after the pole lug 12 and the pole structure 20 are directly connected, the pole lug 12 is directly stressed and easily torn. The ratio of the area of ​​the second weld print area 123 to the area of ​​the first weld print area 122 is too small, and the pole structure 20 and the pole lug 12 are most likely to have stress concentration, which may cause damage to the pole lug 12. The ratio of the area of ​​the second weld print area 123 to the area of ​​the first weld print area 122 is too large, and the heat generation is large, which makes it easy for the pole lug 12 to be welded through. The heat generation of the pole lug 12 is serious and it is easy to melt.

[0052] The ratio of the area of ​​the second weld print area 123 to the area of ​​the first weld print area 122 may be 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8, etc.

[0053] In one embodiment, the first weld mark area 122 is an ultrasonic weld mark area, and the second weld mark area 123 is a laser weld mark area. After a plurality of single-piece tabs are ultrasonically welded to form the first weld mark area 122, laser welding is then used to form the second weld mark area 123, thereby reducing the damage to the tab 12 during the laser welding process of the pole structure 20 and the tab 12, thereby ensuring the welding quality between the pole structure 20 and the tab 12.

[0054] The tab 12 may be composed of a plurality of single-piece tabs, and the plurality of single-piece tabs may be connected by ultrasonic welding, thereby ensuring that the tab 12 has a certain structural strength.

[0055] In one embodiment, Figures 3 to 5As shown, the battery cell 10 includes a battery cell body 11 and a pole lug 12, the pole lug 12 is directly connected to the pole structure 20, the pole structure 20 has a bottom end portion with an end face 22 with a thickness d1, the pole lug 12 has a thickness d2, and d1 / d2 is 0.3-40, thereby ensuring that the thickness difference between the pole structure 20 and the pole lug 12 is not too large, thereby ensuring the welding quality between the pole structure 20 and the pole lug 12, thereby ensuring the safe use performance of the battery.

[0056] The bottom portion of the pole structure 20 having the end surface 22 can be considered as the vertical distance between the bottom wall of the groove 21 of the pole structure 20 and the outer end surface of the pole structure 20 close to the battery cell 10. Figure 1 As shown, the thickness of the bottom portion of the end surface 22 of the pole structure 20 is represented as d1, and the thickness of the pole ear 12 can be considered as the thickness dimension of the pole ear 12 along the direction perpendicular to the large surface of the pole ear 12. Furthermore, the pole ear 12 can be composed of multiple single-piece pole ears, and the multiple single-piece pole ears are gathered to form the pole ear 12, and the thickness of the pole ear 12 is the total thickness of the multiple single-piece pole ears.

[0057] The ratio of the thickness d1 of the bottom end portion of the pole structure 20 having the end surface 22 to the thickness d2 of the pole ear 12 can be 0.3, 0.5, 0.8, 1, 1.5, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 11.5, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39 or 40, etc.

[0058] In one embodiment, Figure 1 As shown, a recess 33 is provided on the inner surface 32 of the battery housing 30 close to the battery cell 10 , and the recess 33 is connected to the pole through hole 31 , so that the recess 33 can avoid the pole ear 12 and avoid the formation of accidental overlap between the pole ear 12 and the battery housing 30 .

[0059] In one embodiment, the depth of the recess 33 is 0.05 mm-1.5 mm, which can not only ensure that the recess 33 forms an effective escape space, but also prevent the recess 33 from being too deep and affecting the structural strength of the battery housing 30 .

[0060] The depth of the recess 33 may be 0.05 mm, 0.08 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0061] In one embodiment, Figure 1 and Figure 3As shown, a fixing portion 34 is provided on the battery housing 30, and at least a portion of the fixing portion 34 is arranged around the pole through hole 31. The fixing portion 34 is bent into a connecting section 341 and a pressing section 342. The connecting section 341 is provided on the battery housing 30, and the pressing section 342 is pressed on the pole structure 20, so that the pole structure 20 is clamped between the pressing section 342 and the battery housing 30, S1 / a1≤18000mm, thereby effectively preventing the pole structure 20 from detaching from the battery housing 30, and ensuring the safe use performance of the battery.

[0062] Since the pole structure 20 protruding from the inner surface 32 of the battery shell 30 has no limiting portion, the bottom end of the pole structure 20 is easily melted into the impact of the internal structure of the battery, resulting in failure of the connection between the pole structure 20 and the battery shell 30. Therefore, the top end of the pole structure 20 is limited by the fixing portion 34 to avoid excessive protrusion of the bottom of the pole structure 20 resulting in weak strength of the pole structure. Therefore, through the setting of the fixing portion 34, the size of S1 / a1 can be smaller, that is, the size a1 of the pole structure 20 protruding from the inner surface 32 can be set larger, so S1 / a1 can be ≤18000mm, thereby facilitating the electrical connection between the pole structure 20 and the battery cell 10.

[0063] The battery housing 30 and the fixing portion 34 are an integrally formed structure, which not only facilitates the molding of the battery housing 30 and the fixing portion 34 , but also ensures the connection strength between the battery housing 30 and the fixing portion 34 , thereby improving the safe use performance of the battery.

[0064] The battery housing 30 may include a cover plate, and the cover plate and the fixing portion 34 are an integrally formed structure. The cover plate with the fixing portion 34 may be formed by a flat plate through stamping, bending, or the like.

[0065] The fixing portion 34 can be bent into a connecting section 341 and a pressing section 342 . For example, the fixing portion 34 can be effectively fixed to the pole structure by riveting, thereby improving the safety and stability of the pole structure.

[0066] It should be noted that two pole structures 20 may be provided on the battery housing 30 , and the battery cell 10 may include two pole tabs 12 , and the two pole tabs 12 may be conveniently electrically connected to the two pole structures 20 .

[0067] In one embodiment, an insulating member 50 may be provided between the battery housing 30 and the pole structure 20. Figure 1 shown.

[0068] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including 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 an active material.

[0069] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0070] 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.

[0071] 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.

[0072] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0073] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0074] A battery pack according to an embodiment of the present invention includes a battery. The battery includes a battery cell 10 , a pole structure 20 and a battery housing 30 . The battery cell 10 is disposed in the battery housing 30 , and the battery cell 10 is electrically connected to the pole structure 20 disposed on the battery housing 30 . The area of ​​the end face 22 of the pole structure 20 facing the battery cell 10 is S1, and the area of ​​the pole through hole 31 on the battery shell 30 is greater than or equal to S1, so that the pole structure 20 can easily pass through the pole through hole 31, and the pole structure 20 protrudes from the inner surface 32 of the battery shell 30 at one end facing the battery cell 10, thereby facilitating the connection between the pole structure 20 and the battery cell 10, and the size of the protruding inner surface 32 of the pole structure 20 is a1, S1 / a1 is 7mm-19000mm, which not only facilitates the connection between the pole structure 20 and the battery cell 10 and improves the overall assembly efficiency, but also increases the creepage distance between the battery cell 10 and the battery shell 30, reduces the risk of short circuit in the battery, and can also ensure the connection stability between the pole structure 20 and the battery cell 10, reduce the risk of connection failure, thereby improving the safe use performance of the battery pack.

[0075] In one embodiment, the battery pack is a battery module or a battery pack.

[0076] The battery module includes a plurality of 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 batteries.

[0077] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0078] 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.

[0079] 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 battery, characterized in that: include: Battery cell (10); A pole structure (20), the pole structure (20) being electrically connected to the battery core (10), and an end surface (22) of the pole structure (20) facing the battery core (10) having an area of ​​S1; A battery housing (30), wherein the battery cell (10) is arranged in the battery housing (30), a pole through hole (31) is provided on the battery housing (30), at least a portion of the pole structure (20) is passed through the pole through hole (31), and an area of ​​the pole through hole (31) is greater than or equal to S1; The pole structure (20) is arranged to protrude from the inner surface (32) of the battery housing (30) toward one end of the battery cell (10), and the dimension of the pole structure (20) protruding from the inner surface (32) is a1, and S1 / a1 is 7 mm-19000 mm.

2. The battery according to claim 1, characterized in that S1: 20mm 2 -2000mm 2 , and / or, a1 is 0.1mm-3mm.

3. The battery according to claim 1, characterized in that A groove (21) is formed on a side of the pole structure (20) facing away from the battery core (10).

4. The battery according to claim 3, characterized in that The battery further comprises a shielding member (40), wherein the shielding member (40) is arranged in the groove (21).

5. The battery according to claim 1, characterized in that The battery cell (10) comprises a battery cell body (11) and a pole lug (12); the pole lug (12) is directly connected to the pole structure (20); and S1 / a1 is 8 mm-17500 mm.

6. The battery according to claim 5, characterized in that The pole lug (12) is connected to the pole column structure (20) by welding, and the pole lug (12) is connected to the pole column structure (20) by resistance welding.

7. The battery according to claim 6, characterized in that The pole structure (20) is provided with at least two protrusions (221) on an end surface (22) close to the battery cell (10); the protrusions (221) are welded to the pole lug (12); and the spacing between at least two adjacent protrusions (221) is 0.01 mm to 10 mm; And / or, S1 / a1 is greater than 8 mm.

8. The battery according to claim 5, characterized in that The pole lug (12) is connected to the pole column structure (20) by ultrasonic welding.

9. The battery according to claim 8, characterized in that The pole lug (12) and the pole column structure (20) are connected by ultrasonic welding to form a weld mark (121), and the welding depth of the weld mark (121) is 0.1 mm-1.5 mm.

10. The battery according to claim 8, characterized in that The pole ear (12) and the pole column structure (20) are connected by ultrasonic welding to form a weld mark (121), wherein the weld mark (121) is a ball tooth weld mark, and the diameter of the ball tooth is 0.1 mm-3 mm.

11. The battery according to claim 5, characterized in that The pole lug (12) is welded to the pole column structure (20) to form a first weld print area (122) and a second weld print area (123) on the surface of the pole lug (12); the area of ​​the second weld print area (123) is smaller than that of the first weld print area (122); the second weld print area (123) is located within the first weld print area (122) along the orthographic projection of the surface where the first weld print area (122) is located; and the ratio of the area of ​​the second weld print area (123) to the area of ​​the first weld print area (122) is 0.1-0.

8.

12. The battery according to claim 11, characterized in that The first welding area (122) is an ultrasonic welding area, and the second welding area (123) is a laser welding area.

13. The battery according to claim 1, characterized in that The battery cell (10) comprises a battery cell body (11) and a pole ear (12), wherein the pole ear (12) is directly connected to the pole column structure (20), the pole column structure (20) has a bottom end portion of the end surface (22) with a thickness of d1, the pole ear (12) has a thickness of d2, and d1 / d2 is 0.3-40.

14. The battery according to any one of claims 1 to 13, characterized in that A recess (33) is provided on the inner surface (32) of the battery housing (30) close to the battery core (10), and the recess (33) is connected to the pole through hole (31).

15. The battery according to claim 14, characterized in that The depth of the depression (33) is 0.05 mm-1.5 mm.

16. The battery according to any one of claims 1 to 13, characterized in that The battery housing (30) is provided with a fixing portion (34), at least part of which is arranged around the pole through hole (31), and the fixing portion (34) is bent into a connecting section (341) and a pressing section (342), the connecting section (341) is arranged on the battery housing (30), and the pressing section (342) is pressed on the pole structure (20), so that the pole structure (20) is clamped between the pressing section (342) and the battery housing (30), and S1 / a1≤18000mm.

17. The battery according to any one of claims 1 to 13, characterized in that The battery is a quadrangular prism battery.

Images