Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell, a battery cover and a battery cover, the battery cell is arranged in the battery shell; the battery core is electrically connected with the pole assembly, the pole assembly comprises a first fixing part, a middle part and a second fixing part, the first fixing part is arranged on the outer side of the battery shell, the second fixing part is arranged on the inner side of the battery shell, at least part of the middle part is arranged in the pole through hole in a penetrating manner, and a recess is formed in one side, deviating from the battery core, of the pole assembly; the recess comprises a side wall and a bottom wall, the side wall is connected with the bottom wall, the middle part forms the side wall, the second fixing part forms the bottom wall, the area defined by the circumferential outer edge of the bottom wall is a, and a is larger than or equal to 10 mm < 2 > and smaller than or equal to 200 mm < 2 >, so that the overall structural strength of the pole assembly can be guaranteed, and the pole assembly can have enough overflowing size; therefore, the safe use performance of the battery is effectively 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, the pole assembly of the battery is used to electrically connect the battery cell in the battery housing, thereby facilitating the battery grouping and improving the battery grouping capacity. The pole assembly itself must have sufficient current capacity to ensure the safe use performance of the battery. However, due to the structural limitations of the pole assembly, the pole assembly may affect the safety performance of the battery. 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] A battery shell, wherein a terminal through hole is provided on the battery shell;

[0006] A battery cell, wherein the battery cell is arranged in a battery casing;

[0007] A pole assembly, the battery cell is electrically connected to the pole assembly, the pole assembly includes a first fixing portion, an intermediate portion and a second fixing portion, the first fixing portion is arranged on the outer side of the battery shell, the second fixing portion is arranged on the inner side of the battery shell, at least part of the intermediate portion is penetrated in the pole through hole, one end of the intermediate portion is connected to the first fixing portion, and the other end of the intermediate portion is connected to the second fixing portion, and a depression is formed on a side of the pole assembly away from the battery cell;

[0008] The depression includes a side wall and a bottom wall, the side wall and the bottom wall are connected, the middle portion forms the side wall, the second fixed portion forms the bottom wall, and the area enclosed by the circumferential outer edge of the bottom wall is a, 10 mm 2 ≤a≤200mm 2 .

[0009] The battery of the utility model embodiment includes a battery casing, a battery cell and a pole assembly. The battery cell is arranged in the battery casing, and the pole assembly is arranged on the battery casing, and the pole assembly is electrically connected to the battery cell. The middle portion of the pole assembly is inserted into the pole through hole, and the first fixing portion and the second fixing portion are respectively located on the outer side of the battery casing away from the battery cell and the inner side of the battery casing close to the battery cell, so that the first fixing portion and the second fixing portion can clamp the battery casing, thereby reliably fixing the pole assembly on the battery casing, improving the safety and stability of the pole assembly. A depression is formed on the side of the pole assembly away from the battery cell, and the depression includes a side wall and a bottom wall connected to each other. The middle portion forms the side wall, and the second fixing portion forms the bottom wall. The area enclosed by the circumferential outer edge of the bottom wall is a, 10mm 2 ≤a≤200mm 2It can not only ensure the overall structural strength of the pole assembly, but also ensure that the pole assembly has sufficient overcurrent size, thereby effectively 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 structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic structural diagram of a battery according to another exemplary embodiment;

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

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

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

[0016] Figure 6 is a schematic diagram of a partial exploded structure of a battery according to an exemplary embodiment;

[0017] Figure 7 is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment;

[0018] Figure 8 is a schematic diagram of a partial cross-sectional structure of a battery according to a fifth exemplary embodiment;

[0019] Fig. 9 is a schematic diagram of a partial cross-sectional structure of a battery according to a sixth exemplary embodiment.

[0020] The following are the descriptions of the reference numerals:

[0021] 10. Battery casing; 11. Post through hole; 20. Battery cell; 21. Battery cell body; 22. Post ear; 30. Post assembly; 31. First fixing portion; 32. Middle portion; 33. Second fixing portion; 331. Through hole; 34. Recess; 341. Side wall; 342. Bottom wall; 40. Adapter; 41. Connection surface; 42. First area; 43. Second area; 50. Protective member; 60. Insulating member. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] An embodiment of the present invention provides a battery. Figures 1 to 6The battery comprises: a battery shell 10, wherein the battery shell 10 is provided with a pole through hole 11; a battery cell 20, wherein the battery cell 20 is arranged in the battery shell 10; a pole assembly 30, wherein the battery cell 20 is electrically connected to the pole assembly 30, and the pole assembly 30 comprises a first fixing portion 31, an intermediate portion 32 and a second fixing portion 33, wherein the first fixing portion 31 is arranged on the outer side of the battery shell 10, the second fixing portion 33 is arranged on the inner side of the battery shell 10, and at least a part of the intermediate portion 32 is penetrated In the pole through hole 11, one end of the middle part 32 is connected to the first fixing part 31, and the other end of the middle part 32 is connected to the second fixing part 33. A recess 34 is formed on the side of the pole assembly 30 away from the battery cell 20; wherein the recess 34 includes a side wall 341 and a bottom wall 342, the side wall 341 and the bottom wall 342 are connected, the middle part 32 forms the side wall 341, the second fixing part 33 forms the bottom wall 342, and the area enclosed by the circumferential outer edge of the bottom wall 342 is a, 10mm 2 ≤a≤200mm 2 .

[0027] A battery according to an embodiment of the utility model includes a battery housing 10, a battery cell 20 and a pole assembly 30. The battery cell 20 is arranged in the battery housing 10, and the pole assembly 30 is arranged on the battery housing 10, and the pole assembly 30 is electrically connected to the battery cell 20. The middle portion 32 of the pole assembly 30 is inserted into the pole through hole 11, and the first fixing portion 31 and the second fixing portion 33 are respectively located on the outer side of the battery housing 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the first fixing portion 31 and the second fixing portion 33 can clamp the battery housing 10, thereby reliably fixing the pole assembly 30 on the battery housing 10, and improving the safety and stability of the pole assembly 30. A recess 34 is formed on the side of the pole assembly 30 away from the battery cell 20, and the recess 34 includes a side wall 341 and a bottom wall 342 connected to each other. The middle portion 32 forms the side wall 341, and the second fixing portion 33 forms the bottom wall 342. The area enclosed by the circumferential outer edge of the bottom wall 342 is a, 10mm 2 ≤a≤200mm 2 It can not only ensure the overall structural strength of the pole assembly 30, but also ensure that the pole assembly 30 has sufficient current-carrying size, thereby effectively improving the safe use performance of the battery.

[0028] It should be noted that, combined with Figure 1 and Figure 2 As shown, the battery comprises a battery housing 10 and a pole assembly 30. The pole assembly 30 is disposed on the battery housing 10 and is disposed in the pole through hole 11. There may be one pole assembly 30, or there may be two pole assemblies 30.

[0029] like Figures 3 to 6As shown, the battery further includes a battery cell 20 , which is disposed in the battery housing 10 , and the battery cell 20 is electrically connected to the pole assembly 30 .

[0030] like Figures 3 to 5 As shown, a pole through hole 11 is provided on the battery housing 10, and a pole assembly 30 is arranged in the pole through hole 11, so that the pole assembly 30 can be conveniently electrically connected to the battery cell 20. For example, the pole assembly 30 can be directly welded to the pole ear of the battery cell 20, or the pole assembly 30 can be electrically connected to the pole ear of the battery cell 20 through an adapter.

[0031] Combination Figures 3 to 5 As shown, the pole assembly 30 includes a first fixing portion 31, an intermediate portion 32 and a second fixing portion 33, the intermediate portion 32 connects the first fixing portion 31 and the second fixing portion 33, the intermediate portion 32 is inserted into the pole through hole 11, and the first fixing portion 31 and the second fixing portion 33 are respectively located on the outer side of the battery housing 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the first fixing portion 31 and the second fixing portion 33 can form a clamp on the battery housing 10, thereby ensuring that the pole assembly 30 is stably fixed on the battery housing 10. The first fixing portion 31 can be formed by a riveting process, for example, the first fixing portion 31 can be formed by a flanging riveting process, thereby enabling the first fixing portion 31 and the second fixing portion 33 to clamp the battery housing 10, thereby achieving fixation of the pole assembly 30.

[0032] The first fixing portion 31 may be a structure formed by flanging after the pole assembly 30 is installed on the battery housing 10 , thereby ensuring that the first fixing portion 31 and the second fixing portion 33 are fixed on the battery housing 10 , thereby forming a reliable fixation of the pole assembly 30 .

[0033] Combination Figures 3 to 5 As shown, a recess 34 is formed on the side of the pole assembly 30 facing away from the battery cell 20, and the recess 34 includes a side wall 341 and a bottom wall 342. The side wall 341 and the bottom wall 342 are connected, the middle part 32 forms the side wall 341, and the second fixing part 33 forms the bottom wall 342. The setting of the recess 34 can form the first fixing part 31 through flanging processing after the pole assembly 30 is installed on the battery housing 10, so that the first fixing part 31 and the second fixing part 33 can clamp the battery housing 10, thereby realizing the installation and fixation of the pole assembly 30.

[0034] The second fixing portion 33 forms a bottom wall 342, and the area enclosed by the circumferential outer edge of the bottom wall 342 is a. The pole ear of the battery cell 20 can be electrically connected to the second fixing portion 33. The portion of the second fixing portion 33 with the bottom wall 342 can be a welding space between the pole assembly 30 and the battery cell 20. In order to ensure the welding area and the flow area, the area a enclosed by the circumferential outer edge of the bottom wall 342 cannot be too small. When the area a enclosed by the circumferential outer edge of the bottom wall 342 is too large, the pole assembly 30 may have a problem of being too large in size in order to meet the flow capacity, which will affect the structural strength of the battery housing 10 and may affect the sealing performance between the pole assembly 30 and the battery housing 10. Figure 4 As shown, the area a enclosed by the circumferential outer edge of the bottom wall 342 is the area enclosed by the circumferential outermost edge of the bottom wall 342. For example, the bottom wall 342 may be circular, in which case the area a enclosed by the circumferential outer edge of the bottom wall 342 is the area of ​​the circle; or, the bottom wall 342 may be rectangular, in which case the area a enclosed by the circumferential outer edge of the bottom wall 342 is the area of ​​the rectangle.

[0035] The area a enclosed by the circumferential outer edge of the bottom wall 342 may be 10 mm 2 , 12mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 45mm 2 , 50mm 2 、55mm 2 、60mm 2 、65mm 2 、70mm 2 , 75mm 2 , 80mm 2 、85mm 2 、90mm 2 、95mm 2 , 100mm 2 、105mm 2 、110mm 2 、115mm 2 , 120mm 2 , 125mm 2 、130mm 2 、135mm 2 、140mm 2 、145mm 2 、150mm 2 、155mm 2 、160mm 2、165mm 2 、170mm 2 、175mm 2 、180mm 2 、185mm 2 、190mm 2 、195mm 2 or 200mm 2 etc.

[0036] In one embodiment, the first fixing portion 31, the middle portion 32 and the second fixing portion 33 are an integrally formed structure, so that the pole assembly 30 can be installed from the inside of the battery casing 10, so that a portion of the pole assembly 30 passes through the battery casing 10, and the first fixing portion 31 is formed by flanging processing, thereby fixing the pole assembly 30.

[0037] In one embodiment, Figure 5 As shown, the second fixing portion 33 is provided with a through hole 331, the through hole 331 is connected to the recess 34, and the opening area of ​​the through hole 331 on the bottom wall 342 is b, 1mm 2 ≤ab≤195mm 2 This not only ensures that the electrolyte can be quickly injected through the through hole 331 or the tab 22 of the power core 20 can be passed through, but also does not affect the welding flow area of ​​the second fixing portion 33 .

[0038] The through hole 331 may be a liquid injection hole.

[0039] Combination Figure 5 As shown, the opening area b of the through hole 331 on the bottom wall 342 is the area of ​​the port of the through hole 331 away from the battery cell 20. For example, the port of the through hole 331 away from the battery cell 20 may be circular, and the opening area b of the through hole 331 on the bottom wall 342 is the area of ​​the circle; or, the port of the through hole 331 away from the battery cell 20 may be rectangular, and the opening area b of the through hole 331 on the bottom wall 342 is the area of ​​the rectangle.

[0040] The difference between the area a enclosed by the circumferential outer edge of the bottom wall 342 and the opening area b of the through hole 331 on the bottom wall 342 determines the remaining bottom wall area of ​​the recess 34. If the difference between the area a enclosed by the circumferential outer edge of the bottom wall 342 and the opening area b of the through hole 331 on the bottom wall 342 is too small, the welding and flow areas are too small, which is not conducive to ensuring the safe use performance of the battery. If the difference between the area a enclosed by the circumferential outer edge of the bottom wall 342 and the opening area b of the through hole 331 on the bottom wall 342 is too large, the opening area b on the bottom wall 342 is too small, which will affect the injection efficiency of the electrolyte.

[0041] The difference between the area a enclosed by the circumferential outer edge of the bottom wall 342 and the opening area b of the through hole 331 on the bottom wall 342 can be 1 mm 2 , 2mm 2 , 5mm 2 , 10mm 2 , 12mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 35mm 2 , 40mm 2 , 45mm 2 , 50mm 2 、55mm 2 、60mm 2 、65mm 2 、70mm 2 , 75mm 2 , 80mm 2 、85mm 2 、90mm 2 、95mm 2 , 100mm 2 、105mm 2 、110mm 2 、115mm 2 , 120mm 2 , 125mm 2 、130mm 2 、135mm 2 、140mm 2 、145mm 2 、150mm 2 、155mm 2 、160mm 2 、165mm 2 、170mm 2 、175mm 2 、180mm 2 、185mm 2 、190mm 2 or 195mm 2 etc.

[0042] In one embodiment, the through hole 331 is located at the center of the bottom wall 342 , so that the structural impact of the through hole 331 on the second fixing portion 33 can be reduced, thereby ensuring the structural strength of the second fixing portion 33 and ensuring the overall flow capacity of the second fixing portion 33 .

[0043] The center of the bottom wall 342 is the centroid of the figure formed by the circumferential outer edge of the bottom wall 342. For example, if the figure formed by the circumferential outer edge of the bottom wall 342 is a circle, the centroid is the center of the circle. The through hole 331 is located at the center of the bottom wall 342, which means that the center of the through hole 331 coincides with the center of the bottom wall 342.

[0044] In one embodiment, the through hole 331 is located at a position deviated from the center of the bottom wall 342 , so that the position of the second fixing portion 33 can be reasonably utilized, thereby improving the space utilization of the second fixing portion 33 .

[0045] The through hole 331 is located at a position deviated from the center of the bottom wall 342 . It can be considered that the center of the through hole 331 does not coincide with the center of the bottom wall 342 .

[0046] In one embodiment, the inner wall surface of the through hole 331 is inclined relative to the central axis direction of the pole through hole 11, so that the through hole 331 can be an expanded structure, which can facilitate the use of the through hole 331, for example, the injection of electrolyte or the penetration of the pole ear 22.

[0047] The inner wall surface of the through hole 331 is inclined relative to the central axis direction of the pole through hole 11 , that is, the inner wall surface of the through hole 331 can be considered as an inclined surface, and the inner wall surface is the end surface of the through hole 331 facing the central axis direction of the pole assembly 30 .

[0048] The inner wall surface of the through hole 331 is inclined relative to the central axis direction of the pole through hole 11. The through hole 331 is an expansion structure. The through hole 331 can expand from one end close to the battery cell 20 toward the other end away from the battery cell 20. Figure 7 Alternatively, the through hole 331 may expand from one end away from the battery cell 20 toward the other end close to the battery cell 20, as shown in FIG. Figure 8 shown.

[0049] The inner wall surface of the through hole 331 is inclined at an angle of 0-45° relative to the central axis of the pole through hole 11 , which not only facilitates the arrangement of the through hole 331 , but also avoids affecting the flow capacity of the second fixing portion 33 .

[0050] The inclination angle of the inner wall surface of the through hole 331 relative to the central axis direction of the pole through hole 11 can be 0, 1°, 5°, 8°, 10°, 11°, 15°, 18°, 20°, 21°, 25°, 28°, 30°, 31°, 35°, 38°, 40°, 41° or 45°, etc.

[0051] In one embodiment, Fig. 9As shown, the battery cell 20 includes a battery cell body 21 and a pole ear 22. The pole ear 22 is led out from the battery cell body 21 and is inserted into the through hole 331. The ratio of the width dimension k1 of the pole ear 22 to the width dimension k2 of the through hole 331 is 0.5-1, which can not only ensure that the pole ear 22 can be inserted normally and reduce the risk of wrinkling of the pole ear 22, but also reduce the difficulty of sealing the through hole 331.

[0052] If the width of the tab 22 is too large to that of the through hole 331, the tab 22 is relatively large, and the tab 22 is easily folded and wrinkled when passing through the through hole 331, which may cause problems such as material falling, affecting the safety performance of the battery. If the width of the tab 22 is too small to that of the through hole 331, the space between the tab 22 and the inner wall of the through hole 331 is large, which places higher requirements on battery sealing and is not conducive to improving the manufacturing efficiency of the battery.

[0053] Combination Fig. 9 As shown, the width dimension of the pole ear 22 can be expressed as k1, the width dimension of the through hole 331 can be expressed as k2, and the ratio of the width dimension k1 of the pole ear 22 to the width dimension k2 of the through hole 331 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95 or 1, etc.

[0054] In one embodiment, Figure 4 As shown, the battery cell 20 includes a battery cell body 21 and a pole ear 22, the pole ear 22 is led out from the battery cell body 21, and the battery also includes a adapter plate 40, and the pole ear 22 is connected to the pole column assembly 30 through the adapter plate 40, so as to facilitate the electrical connection between the pole ear 22 and the pole column assembly 30, and can adapt to different installation positions of the battery cell 20, thereby improving the installation capacity of the battery.

[0055] Among them, the adapter plate 40 is welded and connected to the second fixing part 33, and the adapter plate 40 has a connecting surface 41 facing the second fixing part 33. Along the central axis direction of the pole through hole 11, the orthographic projections of the bottom wall 342 and the connecting surface 41 on the same surface are respectively the first orthographic projection and the second orthographic projection, and the first orthographic projection is located in the area surrounded by the circumferential edge of the second orthographic projection. Therefore, after the adapter plate 40 is welded and connected to the second fixing part 33, the adapter plate 40 completely overlaps with the bottom wall 342 of the recess 34, thereby ensuring a reliable welding area between the adapter plate 40 and the second fixing part 33, thereby ensuring the flow capacity between the adapter plate 40 and the second fixing part 33.

[0056] In one embodiment, the thickness h1 of the bottom wall 342 of the second fixing portion 33 is 0.3mm-6mm, which not only facilitates welding between the second fixing portion 33 and the adapter plate 40, but also ensures that the second fixing portion 33 has sufficient structural strength, thereby ensuring the safe use performance of the battery.

[0057] The second fixing portion 33 has a bottom wall 342 portion which is welded to the adapter plate 40 , which not only facilitates welding of the second fixing portion 33 and the adapter plate 40 , but also ensures the flow capacity between the second fixing portion 33 and the adapter plate 40 .

[0058] Combination Figure 4 As shown, the thickness of the bottom wall 342 of the second fixing portion 33 can be expressed as h1. The thickness h1 of the bottom wall 342 of the second fixing portion 33 can be 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.4mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.4mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.4mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.4mm, 5.5mm, 5.8mm or 6mm, etc.

[0059] In one embodiment, the adapter 40 has a first area 42 welded to the pole ear 22, and a second area 43 welded to the second fixing portion 33. The first area 42 and the second area 43 do not overlap, which can not only ensure the welding quality between the adapter 40 and the pole ear 22, and the adapter 40 and the second fixing portion 33, but also avoid poor control of welding energy during welding, which may easily damage the battery cell 20.

[0060] The adapter plate 40 and the tab 22 can be welded once, for example, by laser welding, resistance welding, or ultrasonic welding, and the adapter plate 40 and the second fixing portion 33 can be welded twice, for example, by laser welding, resistance welding, or ultrasonic welding.

[0061] The battery cell 20 includes a battery cell body 21 and a tab 22, and the tab 22 can extend toward the side of the battery housing 10 having the pole through hole 11, that is, the tab 22 can be top-out; or, the battery cell 20 includes a battery cell body 21 and a tab 22, and the tab 22 can extend toward the other side of the battery housing 10 intersecting with the side of the battery housing 10 having the pole through hole 11, that is, the tab 22 can be side-out. Due to the provision of the adapter 40, the electrical connection between the tab 22 and the pole assembly 30 can be conveniently achieved.

[0062] In one embodiment, Figure 3As shown, the battery cell 20 includes a battery cell body 21 and a tab 22. The tab 22 is led out from the battery cell body 21, and the tab 22 is directly welded to the second fixing portion 33, so that the adapter plate can be omitted, thereby reducing the number of battery components used, thereby reducing the overall weight of the battery, and then ensuring the overall energy density of the battery.

[0063] Among them, along the central axis direction of the pole through hole 11, the orthographic projections of the bottom wall 342 and the pole lug 22 on the same surface are respectively the third orthographic projection and the fourth orthographic projection, and at least part of the fourth orthographic projection coincides with the third orthographic projection, so that the part of the second fixing portion 33 having the bottom wall 342 can be easily welded to the pole lug 22, thereby improving the manufacturing efficiency of the battery and also ensuring the welding quality between the second fixing portion 33 and the pole lug 22.

[0064] The pole tab 22 is directly welded to the second fixing portion 33. For example, the pole tab 22 and the second fixing portion 33 can be connected by resistance welding, ultrasonic welding, laser welding or ultrasonic welding + laser welding. In this process, the recess 34 can be used to accommodate welding tooling, and the recess 34 can also play a role in welding positioning, thereby improving welding efficiency.

[0065] In one embodiment, the thickness h2 of the bottom wall 342 of the second fixing portion 33 is 0.5 mm-5 mm, which can not only ensure the welding quality between the second fixing portion 33 and the pole tab 22, and ensure the current flow capacity between the second fixing portion 33 and the pole tab 22, but also effectively control the structural strength of the second fixing portion 33, thereby improving the safe use performance of the battery.

[0066] When the second fixing portion 33 and the pole ear 22 are directly connected, the thickness h2 of the bottom wall 342 of the second fixing portion 33 is required to be relatively high. If the thickness is too large, the welding power required to penetrate the bottom wall 342 of the second fixing portion 33 will be too large, which will waste energy and make it difficult to perform fine adjustment. It is easy to burn through the pole ear 22 and damage the battery cell body 21. If the thickness is too small and the laser power is too small, it is also difficult to fine-tune. If it is adjusted too large, it is easy to burn through the pole ear 22 and damage the battery cell body 21. If it is adjusted too small, it is easy to cause cold welding of the pole ear 22, which will increase the battery resistance and cause insufficient connection strength between the second fixing portion 33 and the pole ear 22.

[0067] Combination Figure 3As shown, the thickness of the bottom wall 342 of the second fixing portion 33 can be expressed as h2. The thickness h2 of the bottom wall 342 of the second fixing portion 33 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.1mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.1mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.1mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0068] In one embodiment, the depth h3 of the recess 34 is 0.1 mm-6 mm, which can not only effectively control the overall weight of the pole assembly 30, but also facilitate welding of the second fixing portion 33 with the pole ear 22 or the adapter plate 40, and avoid the problem of high space waste.

[0069] Combination Figure 4 As shown, the depth of the recess 34 can be expressed as h3. The depth h3 of the recess 34 can be 0.1mm, 0.3mm, 0.4mm, 0.5mm, 0.8mm, 1mm, 1.3mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.4mm, 2.5mm, 2.8mm, 3mm, 3.3mm, 3.4mm, 3.5mm, 3.8mm, 4mm, 4.3mm, 4.4mm, 4.5mm, 4.8mm, 5mm, 5.3mm, 5.4mm, 5.5mm, 5.8mm or 6mm, etc.

[0070] 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.

[0071] In one embodiment, Figure 1 As shown, the battery can be a quadrangular prism battery, which mainly refers to a battery with a prism shape, but 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. Two pole assemblies 30 can be provided on the battery housing 10, and the two pole assemblies 30 can be electrically connected to the positive pole tab and the negative pole tab of the battery cell 20 respectively.

[0072] 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.

[0073] 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.

[0074] In one embodiment, Figure 2 As shown, 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.

[0075] In one embodiment, Figure 1 As shown, the battery is a quadrangular prism battery, the length dimension of the wall of the battery casing 10 provided with the pole through hole 11 is h, and the maximum dimension of the pole assembly 30 along the length direction of the wall of the battery casing 10 provided with the pole through hole 11 is c1, 0.2≤c1 / h≤0.85, on the basis of ensuring that the pole assembly 30 has reliable current-carrying capacity, it can also be ensured that the battery casing 10 can have reliable structural strength, avoiding the pole assembly 30 from damaging the battery casing 10.

[0076] Combination Figure 1 As shown, the length dimension of the wall surface of the battery housing 10 provided with the pole through hole 11 can be expressed as h. In the length direction of the wall surface along the battery housing 10 provided with the pole through hole 11, the maximum dimension c1 of the pole assembly 30 can be the length dimension of the first fixing portion 31, that is, the length dimension of the first fixing portion 31 is greater than the length dimension of the second fixing portion 33; or, the maximum dimension c1 of the pole assembly 30 can be the length dimension of the second fixing portion 33, that is, the length dimension of the first fixing portion 31 is less than the length dimension of the second fixing portion 33; of course, it is not excluded that the length dimension of the first fixing portion 31 can be equal to the length dimension of the second fixing portion 33.

[0077] If the ratio of the maximum dimension c1 of the pole assembly 30 to the length dimension h of the wall surface of the battery housing 10 provided with the pole through hole 11 is too large, the size occupied by the pole assembly 30 is too large, and the overall strength of the battery housing 10 is reduced, which may affect the safety performance of the battery. If the ratio of the maximum dimension c1 of the pole assembly 30 to the length dimension h of the wall surface of the battery housing 10 provided with the pole through hole 11 is too small, the size of the pole assembly 30 will be relatively small, which is not conducive to ensuring the current carrying capacity of the pole assembly 30.

[0078] Combination Figure 1 As shown, the maximum dimension of the pole assembly 30 may be represented as c1. In this case, the maximum dimension c1 of the pole assembly 30 may be the length dimension of the first fixing portion 31 .

[0079] The ratio of the maximum dimension c1 of the pole assembly 30 to the length dimension h of the wall of the battery housing 10 provided with the pole through hole 11 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or 0.85, etc.

[0080] In one embodiment, Figure 2 As shown, the battery is a cylindrical battery, the diameter of the wall of the battery casing 10 provided with the pole through hole 11 is d, and the maximum size of the pole assembly 30 in the direction parallel to the wall of the battery casing 10 provided with the pole through hole 11 is c2, 0.2≤c2 / d≤0.85. On the basis of ensuring the current carrying capacity of the pole assembly 30, it is also possible to ensure that the battery casing 10 has a certain structural strength to avoid the battery casing 10 being crushed by force on the battery cell 20, thereby causing problems such as lithium deposition or short circuit.

[0081] Combination Figure 2 As shown, the diameter of the wall surface of the battery housing 10 provided with the pole through hole 11 can be expressed as d. In the direction parallel to the wall surface of the battery housing 10 provided with the pole through hole 11, the maximum dimension c2 of the pole assembly 30 can be the length dimension of the first fixing portion 31, that is, the length dimension of the first fixing portion 31 is greater than the length dimension of the second fixing portion 33; or, the maximum dimension c2 of the pole assembly 30 can be the length dimension of the second fixing portion 33, that is, the length dimension of the first fixing portion 31 is less than the length dimension of the second fixing portion 33; of course, it is not excluded that the length dimension of the first fixing portion 31 can be equal to the length dimension of the second fixing portion 33.

[0082] The circumferential outer surfaces of the first fixing portion 31 and the second fixing portion 33 may form a circle, and the maximum dimension c2 of the pole assembly 30 may be the diameter value of the above-mentioned circle. Figure 2 As shown, the maximum dimension of the pole assembly 30 may be represented as c2. In this case, the maximum dimension c2 of the pole assembly 30 may be the diameter dimension of the first fixing portion 31.

[0083] Cylindrical batteries can be high-expansion systems. The end of the cylindrical battery where the pole assembly 30 is located is facing the end of the battery cell 20. Once the end is compressed and bent, lithium deposition and even short circuit may occur, which may seriously cause thermal runaway. Therefore, it is necessary to ensure that the battery casing 10 has a certain structural strength. Therefore, the risk of pressure loss to the battery cell 20 can be reduced by controlling the size occupied by the pole assembly 30.

[0084] The ratio of the maximum dimension c2 of the pole assembly 30 to the diameter d of the wall of the battery housing 10 on which the pole through hole 11 is provided can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8 or 0.85, etc.

[0085] In one embodiment, the battery is a lithium manganese iron phosphate battery. On the basis of ensuring that the pole assembly 30 can have a reliable current-carrying capacity, it can also avoid excessive gas generation during the use of the battery, which may affect the structural strength of the battery.

[0086] In one embodiment, the battery is a silicon-based lithium-ion battery, which can not only reduce the impact of the high internal pressure caused by the serious gas production of the silicon-based lithium-ion battery on the structural strength of the battery housing 10 and the pole assembly 30 during the use of the battery, but also ensure that the pole assembly 30 can have sufficient current flow capacity, thereby improving the safe use performance of the battery.

[0087] In one embodiment, the capacity of the battery is ≥5Ah, so that when the batteries are grouped, the number of batteries used can be effectively controlled, which is beneficial to the grouping of batteries.

[0088] In one embodiment, Figures 3 to 5 As shown, the battery also includes a protective member 50, which is arranged on the pole assembly 30 to seal the recess 34, so that the protective member 50 can protect the recess 34, and the protective member 50 can also increase the current flow capacity and overall structural strength of the pole assembly 30, which is convenient for electrical connection with the bus when the batteries are grouped.

[0089] The protection member 50 may be connected to the pole assembly 30 by welding.

[0090] In one embodiment, Figures 3 to 5 As shown, the battery further includes an insulating member 60 , which is disposed between the pole assembly 30 and the battery housing 10 , thereby achieving insulation and sealing protection between the pole assembly 30 and the battery housing 10 .

[0091] In one embodiment, one or more battery cells 20 may be disposed in the battery housing 10. Figure 6 As shown, two battery cells 20 may be disposed in the battery housing 10 .

[0092] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0093] The battery of the battery pack of one embodiment of the utility model comprises a battery housing 10, a battery cell 20 and a pole assembly 30, wherein the battery cell 20 is arranged in the battery housing 10, and the pole assembly 30 is arranged on the battery housing 10, and the pole assembly 30 is electrically connected to the battery cell 20. The middle portion 32 of the pole assembly 30 is penetrated in the pole through hole 11, and the first fixing portion 31 and the second fixing portion 33 are respectively located on the outer side of the battery housing 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the first fixing portion 31 and the second fixing portion 33 can clamp the battery housing 10, thereby reliably fixing the pole assembly 30 on the battery housing 10, and improving the safety and stability performance of the pole assembly 30. A recess 34 is formed on the side of the pole assembly 30 away from the battery cell 20. The recess 34 includes a side wall 341 and a bottom wall 342 connected to each other. The middle part 32 forms the side wall 341, and the second fixing part 33 forms the bottom wall 342. The area enclosed by the circumferential outer edge of the bottom wall 342 is a, 10 mm 2 ≤a≤200mm 2 It can not only ensure the overall structural strength of the pole assembly 30, but also ensure that the pole assembly 30 has sufficient current-carrying size, thereby effectively improving the safe use performance of the battery pack.

[0094] In one embodiment, the battery pack is a battery module or a battery pack.

[0095] It should be noted that the battery pack includes a plurality of batteries. The plurality of batteries can be arranged in a battery box after forming a battery module. Alternatively, the plurality of batteries can be directly arranged in the battery box, that is, the plurality of batteries do not need to be grouped.

[0096] 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.

[0097] 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: A battery casing (10), wherein a terminal through hole (11) is provided on the battery casing (10); A battery cell (20), wherein the battery cell (20) is arranged in the battery housing (10); A pole assembly (30), the battery cell (20) being electrically connected to the pole assembly (30), the pole assembly (30) comprising a first fixing portion (31), an intermediate portion (32) and a second fixing portion (33), the first fixing portion (31) being arranged on the outside of the battery housing (10), the second fixing portion (33) being arranged on the inside of the battery housing (10), at least a portion of the intermediate portion (32) being passed through the pole through hole (11), one end of the intermediate portion (32) being connected to the first fixing portion (31), and the other end of the intermediate portion (32) being connected to the second fixing portion (33), and a recess (34) being formed on a side of the pole assembly (30) facing away from the battery cell (20); The recess (34) includes a side wall (341) and a bottom wall (342), the side wall (341) and the bottom wall (342) are connected, the middle part (32) forms the side wall (341), the second fixing part (33) forms the bottom wall (342), and the area enclosed by the circumferential outer edge of the bottom wall (342) is a, 10 mm 2 ≤a≤200mm 2 .

2. The battery according to claim 1, characterized in that The second fixing portion (33) is provided with a through hole (331), the through hole (331) is connected to the recess (34), and the opening area of ​​the through hole (331) located on the bottom wall (342) is b, 1 mm 2 ≤ab≤195mm 2 .

3. The battery according to claim 2, characterized in that The through hole (331) is located at the center of the bottom wall (342).

4. The battery according to claim 2, characterized in that The through hole (331) is located at a position deviated from the center of the bottom wall (342).

5. The battery according to claim 2, characterized in that The inner wall surface of the through hole (331) is arranged to be inclined relative to the central axis direction of the pole through hole (11); The inner wall surface of the through hole (331) is inclined at an angle of 0-45° relative to the central axis direction of the pole through hole (11).

6. The battery according to claim 2, characterized in that The battery cell (20) comprises a battery cell body (21) and a pole ear (22), wherein the pole ear (22) is led out from the battery cell body (21), the pole ear (22) is inserted into the through hole (331), and the ratio of a width dimension k1 of the pole ear (22) to a width dimension k2 of the through hole (331) is 0.5-1.

7. The battery according to claim 1, characterized in that The battery cell (20) comprises a battery cell body (21) and a pole lug (22), wherein the pole lug (22) is led out from the battery cell body (21), and the battery further comprises a switching plate (40), wherein the pole lug (22) is connected to the pole column assembly (30) via the switching plate (40); The adapter plate (40) is welded to the second fixing portion (33), and the adapter plate (40) has a connection surface (41) facing the second fixing portion (33). Along the central axis direction of the pole through hole (11), the orthographic projections of the bottom wall (342) and the connection surface (41) on the same surface are respectively a first orthographic projection and a second orthographic projection, and the first orthographic projection is located in the area enclosed by the circumferential edge of the second orthographic projection.

8. The battery according to claim 7, characterized in that The thickness h1 of the bottom wall (342) of the second fixing portion (33) is 0.3 mm to 6 mm.

9. The battery according to claim 7, characterized in that The adapter plate (40) has a first area welded to the pole lug (22), and a second area welded to the second fixing portion (33), and the first area and the second area do not overlap.

10. The battery according to claim 1, characterized in that The battery cell (20) comprises a battery cell body (21) and a pole ear (22), wherein the pole ear (22) is led out from the battery cell body (21), and the pole ear (22) is directly welded and connected to the second fixing portion (33); Wherein, along the central axis direction of the pole through hole (11), the orthographic projections of the bottom wall (342) and the pole ear (22) on the same surface are respectively the third orthographic projection and the fourth orthographic projection, and at least part of the fourth orthographic projection coincides with the third orthographic projection.

11. The battery according to claim 10, characterized in that The thickness h2 of the bottom wall (342) of the second fixing portion (33) is 0.5 mm to 5 mm.

12. The battery according to any one of claims 1 to 11, characterized in that The depth h3 of the recess (34) is 0.1 mm-6 mm.

13. The battery according to any one of claims 1 to 11, characterized in that The battery is a quadrangular prism-type battery, the length dimension of the wall surface of the battery housing (10) on which the pole through hole (11) is provided is h, and along the length direction of the wall surface of the battery housing (10) on which the pole through hole (11) is provided, the maximum dimension of the pole assembly (30) is c1, and 0.2≤c1 / h≤0.

85.

14. The battery according to any one of claims 1 to 11, characterized in that The battery is a cylindrical battery, the diameter of the wall of the battery housing (10) on which the pole through hole (11) is provided is d, and the maximum dimension of the pole assembly (30) in a direction parallel to the wall of the battery housing (10) on which the pole through hole (11) is provided is c2, and 0.2≤c2 / d≤0.

85.

15. The battery according to any one of claims 1 to 11, characterized in that The battery is a lithium manganese iron phosphate battery; or, the battery is a silicon-based lithium ion battery; or, the capacity of the battery is ≥5Ah.

16. The battery according to any one of claims 1 to 11, characterized in that The first fixing portion (31), the middle portion (32) and the second fixing portion (33) are an integrally formed structure.

17. The battery according to any one of claims 1 to 11, characterized in that The battery further comprises a protective member (50), wherein the protective member (50) is arranged on the pole assembly (30) to seal the recess (34).

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