Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery shell assembly and a battery. The battery shell assembly comprises a battery shell and a pole structure, the pole structure is arranged on the battery shell, the pole structure comprises a main body, a groove is formed in the main body, the groove is provided with an open end face, the area of the open end face is S1, the area of a connecting end face, deviating from the groove, of the main body is S2, the depth of the groove is h1, the distance between the bottom wall of the groove and the connecting end face is h2, 0.02 < = (S1 * h1) / (S2 * h2) < = 30, therefore, the manufacturing cost of the main body can be effectively controlled, the main body can have certain structural strength, the overall overcurrent capability can be ensured, the risk of deformation of the battery shell caused by overhigh strength cannot be increased, and the use performance of the pole structure is reliably improved.

Description

[0001] This case is a divisional application of application number 202420557525.4, application date 2024.03.21, invention titled Battery Housing Assembly and Battery. Technical Field

[0002] This utility model relates to the field of battery technology, and in particular to a battery. Background Technology

[0003] In related technologies, batteries include terminal structures, which can be used to make electrical connections with battery cells, thereby serving as electrode leads to facilitate the charging and discharging of batteries. However, due to the structural limitations of the terminal structure, the manufacturing cost of the terminal structure is relatively high, which is not conducive to reducing the overall manufacturing cost of batteries. Utility Model Content

[0004] This utility model provides a battery housing assembly and a battery to improve the performance of the battery housing assembly.

[0005] According to a first aspect of the present invention, a battery is provided, including a battery housing assembly. The battery housing assembly includes a battery housing and an electrode structure. The electrode structure is disposed on the battery housing. The electrode structure includes a main body, the main body having a groove, the groove having an open end face, and the area of ​​the main body away from the connecting end face of the groove being S2.

[0006] The battery also includes a cell, which is disposed inside the battery casing. The terminal structure is electrically connected to the cell. At least one end of the cell extends into a tab portion, which includes at least two single-layer tabs. The tab portion is electrically connected to the terminal structure. The thickness of the single-layer tab is x, and S2 / x is 1100mm-600000mm.

[0007] According to a second aspect of the present invention, a battery housing assembly is provided, including a battery housing and an electrode structure. The electrode structure is disposed on the battery housing. The electrode structure includes a main body, the main body having a groove, the groove having an open end face, the area of ​​the open end face being S1, the area of ​​the connecting end face of the main body away from the groove being S2, the depth of the groove being h1, and the distance between the bottom wall of the groove and the connecting end face being h2, where 0.02≤(S1×h1) / (S2×h2)≤30.

[0008] One embodiment of the present invention includes a battery housing and an electrode post structure disposed on the battery housing. The electrode post structure includes a main body with a groove, thereby reducing the overall production cost of the electrode post structure. The area of ​​the opening end face of the groove is S1, the area of ​​the connecting end face of the main body away from the groove is S2, the depth of the groove is h1, and the distance between the bottom wall of the groove and the connecting end face is h2. By making (S1×h1) / (S2×h2) 0.02-30, not only can the manufacturing cost of the main body be effectively controlled, but the main body can also have a certain structural strength. This ensures the overall current carrying capacity without increasing the risk of battery housing deformation due to excessive strength, thereby reliably improving the performance of the electrode post structure.

[0009] According to a third aspect of the present invention, a battery is provided, including the battery housing assembly described above. The battery also includes a battery cell disposed within the battery housing, and an electrode structure electrically connected to the battery cell.

[0010] The battery of this utility model embodiment includes a battery casing assembly and a battery cell. The battery cell is disposed inside the battery casing, and a terminal structure is electrically connected to the battery cell. The terminal structure is disposed on the battery casing and includes a main body with a groove. This reduces the overall production cost of the terminal structure. The area of ​​the opening end face of the groove is S1, the area of ​​the connecting end face of the main body away from the groove is S2, the depth of the groove is h1, and the distance between the bottom wall of the groove and the connecting end face is h2. If (S1×h1) / (S2×h2) is too small, the area of ​​the connecting end face S2 is too large, or the distance h2 between the bottom wall of the groove and the connecting end face is too large, it will be difficult to electrically connect the terminal structure with other structures. The terminal structure is prone to damaging the battery casing, electrode tabs, or adapter plates, and the terminal structure occupies a large amount of internal space in the battery. If (S2×h2) is too large, the area S2 of the connection end face will be too narrow, resulting in severe overheating of the battery terminal structure and weak terminal structure strength. By making (S1×h1) / (S2×h2) 0.02-30, not only can the manufacturing cost of the main body be effectively controlled, but the main body can also have a certain structural strength. This ensures the overall current carrying capacity without increasing the risk of battery casing deformation due to excessive strength, thereby reliably improving the safe use performance of the battery. Attached Figure Description

[0011] To better understand this disclosure, reference may be made to the embodiments shown in the following figures. Components in the figures are not necessarily to scale, and related elements may be omitted to emphasize and clearly illustrate the technical features of this disclosure. Additionally, related elements or components may have different arrangements as known in the art. Furthermore, in the figures, the same reference numerals denote the same or similar components in various figures. Wherein:

[0012] Figure 1 This is a schematic cross-sectional view of a pole post structure according to an exemplary embodiment;

[0013] Figure 2 This is a schematic diagram of a pole structure from one perspective, according to an exemplary embodiment.

[0014] Figure 3 This is a schematic diagram of a pole structure from another perspective, according to an exemplary embodiment;

[0015] Figure 4 This is a cross-sectional schematic diagram of a pole post structure according to another exemplary embodiment;

[0016] Figure 5 This is a partial cross-sectional schematic diagram of a battery according to a first exemplary embodiment;

[0017] Figure 6 This is a partial cross-sectional schematic diagram of a battery according to a second exemplary embodiment;

[0018] Figure 7 This is a partial cross-sectional schematic diagram of a battery according to a third exemplary embodiment;

[0019] Figure 8 This is a partially exploded structural diagram of a battery according to an exemplary embodiment;

[0020] Figure 9 This is a schematic diagram of a partial cell structure of a battery according to an exemplary embodiment;

[0021] Figure 10 This is a schematic diagram of the structure of a battery according to an exemplary embodiment.

[0022] The annotations in the attached figures are explained as follows:

[0023] 10. Main body; 11. Groove; 111. Open end face; 112. Bottom wall; 113. First section; 114. Second section; 12. Connecting end face; 15. Clamping section; 20. Shielding part; 30. Battery casing; 31. Terminal through hole; 32. Fixing part; 321. Connecting section; 322. Pressing section; 40. Battery cell; 41. Terminal tab; 42. Protrusion. Detailed Implementation

[0024] The technical solutions in the exemplary embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. The exemplary embodiments described herein are for illustrative purposes only and are not intended to limit the scope of protection of this 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 this disclosure.

[0025] In the description of this disclosure, unless otherwise expressly specified and limited, the terms “first” and “second” are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term “multiple” refers to two or more; and the term “and / or” includes any and all combinations of one or more associated listed items. In particular, references to “the / described” object or “a” object are also intended to indicate one of a possible plurality of such objects.

[0026] Unless otherwise specified or stated, the terms "connection," "fixed," etc., should be interpreted broadly. 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. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0027] Furthermore, it should be understood that the directional terms such as "upper," "lower," "inner," and "outer" described in the exemplary embodiments of this disclosure are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the exemplary embodiments of this disclosure. It should also be understood that, in the context of a reference to an element or feature being connected to another element (one or more) "upper," "lower," "inner," or "outer," it can be directly connected to the other element (one or more) "upper," "lower," "inner," or "outer," or indirectly connected to the other element (one or more) "upper," "lower," "inner," or "outer" through an intermediate element.

[0028] One embodiment of this utility model provides a battery housing assembly; please refer to [reference needed]. Figures 1 to 10The battery housing assembly includes a battery housing 30 and a terminal structure. The terminal structure is disposed on the battery housing 30. The terminal structure includes a main body 10. The main body 10 forms a groove 11. The groove 11 has an open end face 111 with an area of ​​S1. The area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is S2. The depth of the groove 11 is h1. The distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is h2. 0.02≤(S1×h1) / (S2×h2)≤30.

[0029] One embodiment of the present invention includes a battery housing 30 and an electrode post structure disposed on the battery housing 30. The electrode post structure includes a main body 10, and the main body 10 has a groove 11 formed therein, thereby reducing the overall production cost of the electrode post structure. The area of ​​the opening end face 111 of the groove 11 is S1, the area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is S2, the depth of the groove 11 is h1, and the distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is h2. By making (S1×h1) / (S2×h2) 0.02-30, not only can the manufacturing cost of the main body 10 be effectively controlled, but the main body 10 can also have a certain structural strength. This ensures the overall current carrying capacity without increasing the risk of deformation of the battery housing 30 due to excessive strength, thereby reliably improving the performance of the battery housing assembly.

[0030] It should be noted that the battery housing assembly includes a battery housing 30 and an electrode post structure disposed on the battery housing 30. The battery housing 30 may include a first housing component and a second housing component, and the electrode post structure may be disposed on either the first housing component or the second housing component. The first housing component and the second housing component may be separate structures. For example, the first housing component may be a cover plate, while the second housing component may be a structure with a cavity, that is, the second housing component includes a side wall and a bottom wall opposite to the cover plate; or, the first housing component and the second housing component may be an integrally formed structure.

[0031] Combination Figure 1 As shown, the main body 10 has a groove 11, which has an open end face 111. The bottom wall 112 of the groove 11 is positioned opposite to the open end face 111. Due to the presence of the groove 11, the overall height of the electrode structure can be increased, reducing the initial thickness of the electrode structure plate, thereby reducing the overall production cost of the electrode structure. This ensures efficient electrical connection and assembly between the electrode structure and the internal and external structures of the battery, while avoiding excessively large electrode structure dimensions and strength, which could exacerbate the risk of deformation of the battery casing and other structures. The electrode structure can be connected to the busbar during battery assembly, and it can be electrically connected to the tabs of the battery cell via adapter plates.

[0032] Combination Figures 1 to 3As shown, the area of ​​the open end face 111 is represented by S1, the area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is represented by S2, the depth of the groove 11 is represented by h1, and the distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is represented by h2. If (S1×h1) / (S2×h2) is too small, the area S2 of the connecting end face 12 is too large, or the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 is too large, it will be difficult to electrically connect the electrode structure with other structures, the electrode structure is prone to damage to the battery shell, electrode tabs or adapter plates, and the electrode structure occupies a large space inside the battery. If (S1×h1) / (S2×h2) is too large, the area S2 of the connecting end face 12 is too narrow, the electrode structure of the battery will overheat severely, and the electrode structure itself will be weak. By ensuring that (S1×h1) / (S2×h2) is 0.02-30, the structural strength of the pole structure can be effectively guaranteed, and damage to other structures can be reduced. Furthermore, combined with... Figure 6 and Figure 7 The connecting end face 12 of the main body 10 facing away from the groove 11 is the bottom surface of the main body 10 facing the cell 40, and the connecting end face 12 of the main body 10 is denoted as S2.

[0033] (S1×h1) / (S2×h2) can be 0.02, 0.03, 0.04, 0.05, 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.6, 5.8, 6, 6.2, 6.4, 6.5, 6.6, 6.8, 7, 7.2, 7.4, 7.5, 7.6, 7.8, 8, 8.2, 8.4, 8.5, 8.6, 8.8, 9, 9.2, 9.4, 9.5, 9.6, 9.8, 10, 10 2, 10.4, 10.5, 10.6, 10.8, 11, 11.2, 11.4, 11.5, 11.6, 11.8, 12, 12.2, 12.4, 12.5, 12.6, 12.8, 13, 13.2, 13.4, 13.5, 13.6, 13.8, 14, 14.2, 14.5, 14.6, 14. 8, 15, 15.5, 16, 16.5, 17, 17.5, 18, 18.5, 19, 19.5, 20, 20.5, 21, 21.5, 22, 22.5, 23, 23.5, 24, 24.5, 25, 25.5, 26, 26.5, 27, 27.5, 28, 28.5, 29, 29.5, or 30, etc.

[0034] In one embodiment, the area of ​​the open end face 111 is S1, 20mm.2 ≤S1≤1960mm 2 This allows for both cost control and current handling capacity control of the pole structure, thereby improving its safety performance.

[0035] If the area S1 of the opening end face 111 is too small, the height increase of the pole structure is small, which is not conducive to the rapid assembly of the pole structure and other battery structures. If the area S1 of the opening end face 111 is too large, the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 may be small, making it difficult for the top of the pole structure to achieve overcurrent. At the same time, the stress concentration at the top leads to the risk of structural failure when the pole structure is assembled with the battery casing.

[0036] The area S1 of the open end face 111 can be 20mm. 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 60mm 2 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 2290mm 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 610mm 2 615mm 2 520mm 2 625mm 2 650mm 2 680mm 2 700mm 2 750mm 2 800mm 2 850mm 2 900mm 2 950mm 2 1000mm 2 1100mm 2 1200mm 2 1300mm 2 1400mm 2 1500mm 2 1600mm 2 1700mm 2 1800mm 2 1900mm 2 Or 1960mm 2etc.

[0037] In one embodiment, the depth of the groove 11 is h1, and the distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is h2, where 0.08≤h1 / h2≤6. This effectively controls the depth of the groove 11 and the thickness of the bottom structure of the main body 10, thereby effectively improving the structural strength and current carrying capacity of the pole structure.

[0038] The distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 can be considered as the thickness of the bottom structure of the groove 11. If the ratio of the depth h1 of the groove 11 to the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 is too small, the overall thickness of the electrode structure is too large, which affects the electrical connection efficiency and structural stability of subsequent electrode structures and cell tabs. That is, if the depth of the groove 11 is small, the overall height of the electrode structure is small, and the tabs need to be extended further to connect with the electrode structure. The tabs may be bent, increasing the risk of tab tearing, reducing the utilization rate of the battery's internal space, and increasing the production cost of a single electrode structure. If the ratio of the depth h1 of the groove 11 to the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 is too large, the bottom structure thickness of the groove 11 of the electrode structure is small. Gas generation inside the battery or vibration can damage the strength of the bottom structure of the groove 11.

[0039] The ratio of the depth h1 of the groove 11 to the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 can be 0.08, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.6, 5.8, or 6, etc.

[0040] In one embodiment, 0.5mm≤h1≤11mm, that is, the depth h1 of the groove 11 is 0.5mm-11mm. This ensures that the pole structure has a certain height, which facilitates the connection between the pole structure and other structures, and avoids the problem of excessive manufacturing cost caused by an excessively large depth h1 of the groove 11.

[0041] The depth h1 of the groove 11 can be 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, 10mm, 10.2mm, 10.5mm, 10.8mm, or 11mm, etc.

[0042] In one embodiment, 1.5mm≤h2≤8mm, that is, the distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 is 1.5mm-8mm, which can ensure the structural strength of the bottom structure of the groove 11, reduce the probability of damage to the bottom structure of the groove 11, and avoid the problem of high cost caused by the bottom structure of the groove 11 being too thick.

[0043] The distance h2 between the bottom wall 112 of the groove 11 and the connecting end face 12 can be 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, or 8mm, etc.

[0044] In one embodiment, the area of ​​the connecting end face 12 of the body 10 facing away from the groove 11 is S2, 18mm. 2 ≤S2≤1900mm 2 This ensures the current carrying capacity of the pole structure and also controls the utilization rate of the internal space of the pole structure, thereby improving the performance of the pole structure.

[0045] If the area S2 of the connection end face 12 of the main body 10 away from the groove 11 is too small, the current flow area at the bottom of the electrode structure is too narrow, and local heat generation will cause battery thermal runaway; if the area S2 of the connection end face 12 of the main body 10 away from the groove 11 is too large, the electrode structure occupies a large space inside the battery, and is installed on the battery casing close to the edge of the battery casing, the overall structural stability is prone to failure.

[0046] The area S2 of the connecting end face 12 of the main body 10 away from the groove 11 can be 18mm. 2 20mm 2 30mm2 、32mm 2 、35mm 2 、38mm 2 、40mm 2 、42mm 2 、45mm 2 、48mm 2 、50mm 2 、52mm 2 、55mm 2 、58mm 2 、60mm 2 、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 2490mm 2 500mm 2 510mm 2 520mm 2 540mm 2 550mm 2 560mm 2 570mm 2 580mm 2 590mm 2 600mm 2 625mm 2 650mm 2 680mm 2 700mm 2 750mm 2 800mm 2 850mm 2 900mm 2 950mm 2 1000mm 2 1100mm 2 1200mm 2 1300mm 2 1400mm 2 1500mm 2 1600mm 2 1700mm 2 1800mm 2 Or 1900mm 2 etc.

[0047] In one embodiment, the area of ​​the open end face 111 is S1, and the area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is S2, where 0.6≤S1 / S2≤5. This can achieve a balance between the top and bottom structural strengths of the main body 10, avoiding large differences between the two ends of the electrode structure, which could lead to uneven stress inside and outside the battery, causing electrical connection failure or structural damage at one end, thereby effectively improving the safe use performance of the electrode structure.

[0048] If the ratio of the area S1 of the open end face 111 to the area S2 of the connecting end face 12 is too large or too small, it will cause the structure of the main body 10 to become unbalanced, which is not only detrimental to the safety performance of the pole structure, but also inconvenient to the manufacturing of the pole structure.

[0049] The ratio of the area S1 of the open end face 111 to the area S2 of the connecting end face 12 can be 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.5, 1.8, 2, 2.1, 2.2, 2.5, 2.8, 3, 3.1, 3.2, 3.5, 3.8, 4, 4.1, 4.2, 4.5, 4.8 or 5, etc.

[0050] In one embodiment, the maximum area enclosed by the circumferential outer surface of the main body 10 is S3, 1.05≤S3 / S1≤4, and / or 1.1≤S3 / S2≤6, thereby effectively controlling the structural strength of the main body 10, enabling the main body 10 to have a larger circumferential area, which can then be used for the installation and fixing of the pole post structure, releasing the stress during the assembly of the pole post structure, and reducing the pressure on the pole post structure.

[0051] Combination Figure 1 and Figure 2 As shown, the maximum area enclosed by the circumferential outer surface of the main body 10 can be represented as S3. The maximum area S3 enclosed by the circumferential outer surface of the main body 10 can be considered as the orthographic projection area of ​​the main body 10 on a plane along the direction perpendicular to the opening end face 111. The maximum area S3 enclosed by the circumferential outer surface of the main body 10 is formed in the middle part of the main body 10. This component can be used to realize the buffer surface for the top and bottom of the main body 10 to bear the force. At the same time, it can be used for the installation and fixation of the pole structure, release the stress during the assembly of the pole structure, and reduce the pressure on the pole structure. If S3 / S1 and S3 / S2 are too large or too small, the pole structure will occupy a large space of the battery and the other end will fail due to the force on one end of the pole structure.

[0052] The ratio of the maximum area S3 enclosed by the circumferential outer surface of the main body 10 to the area S1 of the opening end face 111 can be 1.05, 1.1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8 or 4, etc.

[0053] The ratio of the maximum area S3 enclosed by the circumferential outer surface of the main body 10 to the area S2 of the connecting end face 12 can be 1.1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.6, 5.8, or 6, etc.

[0054] In one embodiment, the groove 11 includes a first segment 113 and a second segment 114, which are connected. The first segment 113 has a bottom wall 112, and the second segment 114 has an open end face 111. The area of ​​the open end face 111 is larger than the area of ​​the bottom wall 112, and / or the area enclosed by the circumferential outer edge of the bottom end of the second segment 114 is larger than the area of ​​the bottom wall 112. This allows the first segment 113 and the second segment 114 to form a stepped structure, which not only facilitates molding but also prevents the overall area of ​​the groove 11 from being too large, thus affecting the structural strength and flow capacity of the pole structure and improving the safe use performance of the pole structure.

[0055] The area of ​​the open end face 111 is larger than the area of ​​the bottom wall 112, which can control the space utilization rate at the bottom of the pole structure and facilitate the installation of the pole structure.

[0056] The area enclosed by the outer edge of the bottom end of the second segment 114 is larger than the area of ​​the bottom wall 112, which allows the first segment 113 and the second segment 114 to have unequal areas. This can effectively control the structural strength of the pole structure and also facilitate the placement of the shielding member 20 inside the second segment 114.

[0057] In one embodiment, the ratio of the area of ​​the opening end face 111 to the area of ​​the bottom wall 112 is 1.2-9. This not only controls the overall area difference of the groove 11 and ensures that the pole structure will not have excessive structural strength imbalance, but also ensures that the formation of the groove 11 can control the manufacturing cost of the pole structure.

[0058] The ratio of the area of ​​the open end face 111 to the area of ​​the bottom wall 112 can be 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, 4, 4.2, 4.4, 4.5, 4.8, 5, 5.2, 5.4, 5.5, 5.6, 5.8, 6, 6.2, 6.4, 6.5, 6.8, 7, 7.2, 7.4, 7.5, 7.8, 8, 8.2, 8.4, 8.5, 8.8, or 9, etc.

[0059] In one embodiment, the ratio of the area S4 enclosed by the outer circumferential edge of the bottom end of the second segment 114 to the area S5 of the bottom wall 112 is 1.02-4. This not only avoids the large difference between the two areas and the weak strength at the top of the pole structure, but also ensures that the strength at the top and bottom of the pole structure is relatively balanced, thus ensuring a balanced load-bearing capacity and improving the safe use performance of the pole structure.

[0060] Combination Figure 1 and Figure 2As shown, the area enclosed by the outer perimeter of the bottom end of the second segment 114 can be represented as S4, and the area of ​​the bottom wall 112 can be represented as S5. The ratio of the area S4 enclosed by the outer perimeter of the bottom end of the second segment 114 to the area S5 of the bottom wall 112 can be 1.02, 1.05, 1.1, 1.2, 1.4, 1.5, 1.8, 2, 2.2, 2.4, 2.5, 2.8, 3, 3.2, 3.4, 3.5, 3.8, or 4, etc.

[0061] In one embodiment, the distance between the open end face 111 and the outermost edge of the circumferential direction of the end of the main body 10 with the open end face 111 is m, 0.1mm≤m≤5mm. This not only ensures the overall strength of the top of the pole structure, but also avoids the pole structure being too low in overall height, which would affect subsequent connection and assembly.

[0062] Combination Figure 1 As shown, the distance between the open end face 111 and the outer circumferential edge of the end of the main body 10 having the open end face 111 is denoted as m. The distance m between the open end face 111 and the outer circumferential edge of the end of the main body 10 having the open end face 111 can be 0.1mm, 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, or 2.2mm. , 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm or 5mm, etc.

[0063] In one embodiment, such as Figure 4 As shown, the terminal post structure also includes a shielding member 20, which is disposed within the groove 11. The ratio S1 / S2 ≥ 0.8, thereby increasing the current-carrying capacity of the terminal post structure. Furthermore, the shielding member 20 facilitates electrical connection between the terminal post structure and the busbar during battery assembly. The shielding member 20 facilitates subsequent electrical connection between the terminal post structure and external batteries, increasing the overall current-carrying area. Simultaneously, the overall strength of the terminal post structure and the external electrical connection is ensured, thus increasing the area S1 of the open end face 111 to guarantee greater current carrying capacity.

[0064] The shielding member 20 occupies a portion of the space in the groove 11, and the shielding member 20 can be welded to the main body 10. Alternatively, the shielding member 20 can occupy the entire space in the groove 11.

[0065] In one embodiment, such as Figure 5 As shown, the battery housing 30 is provided with a terminal through hole 31, and at least a portion of the main body 10 passes through the terminal through hole 31. The battery housing 30 is provided with a fixing part 32, and at least a portion of the fixing part 32 is arranged around the terminal through hole 31. The fixing part 32 is bent into a connecting section 321 and a pressing section 322. The connecting section 321 is provided on the battery housing 30, and the pressing section 322 is pressed on the main body 10 so that the main body 10 is clamped between the pressing section 322 and the battery housing 30, thereby effectively preventing the terminal structure from detaching from the battery housing 30 and ensuring the safe use performance of the battery.

[0066] The top of the pole structure has a large groove 11, while the bottom of the pole structure is relatively weak. The pole structure is limited by the fixing part 32 provided by the battery housing 30 to prevent the pole structure from being subjected to force near the end face of the cell, which would cause the connection and seal between the pole structure and the battery housing 30 to fail.

[0067] The battery casing 30 is provided with a fixing part 32, 0.08≤(S1×h1) / (S2×h2). The setting of the fixing part 32 ensures the overall strength of the terminal structure. Therefore, increasing the overall size of S1×h1 can improve the production efficiency of the terminal structure while ensuring the overall strength of the terminal structure, facilitate the subsequent electrical connection between the terminal structure and the battery cell, and significantly reduce the overall manufacturing cost of the terminal structure.

[0068] It should be noted that the battery housing 30 and the fixing part 32 are integrally molded, which not only facilitates the molding of the battery housing 30 and the fixing part 32, but also ensures the connection strength between the battery housing 30 and the fixing part 32, thereby improving the safe use performance of the battery.

[0069] The battery casing 30 may include a cover plate, which is integrally formed with the fixing part 32. The cover plate with the fixing part 32 can be formed by stamping, bending or other methods using a flat plate.

[0070] The fixing part 32 can be bent into a connecting section 321 and a pressing section 322. For example, the fixing part 32 can be effectively fixed to the pole structure by means of flange riveting, thereby improving the safety and stability performance of the pole structure.

[0071] Alternatively, it is possible that the cover plate and the fixing part 32 are separate structures; for example, the cover plate and the fixing part 32 can be welded together.

[0072] In one embodiment, the area of ​​the terminal through hole 31 is not less than S2, which allows the terminal structure to be inserted into the terminal through hole 31 from its bottom end and penetrate into the battery housing 30 when it is installed. This not only facilitates the electrical connection with the battery cell, but also allows the battery housing 30 to position the terminal structure, thereby improving the battery installation efficiency.

[0073] The area of ​​the through hole 31 can be greater than S2, or the area of ​​the through hole 31 can be equal to S2.

[0074] In one embodiment, the minimum thickness of the fixing part 32 is 0.3mm-1.5mm. This not only ensures the structural strength of the fixing part 32, but also avoids the problem that if the thickness of the fixing part 32 is too large, the local structural strength of the battery housing 30 will be too weak when forming the battery housing 30 and the fixing part 32, which is not conducive to improving the safe use performance of the battery.

[0075] The minimum thickness of the fixing part 32 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc.

[0076] In one embodiment, the width of the pressure-blocking section 322 is 'a', and the ratio of 'a' to 'S1' is 0.0006-0.38. This effectively controls the fixing ability of the pressure-blocking section 322 on the electrode structure, ensuring that the electrode structure has reliable structural dimensions, thereby guaranteeing the current-carrying capacity of the electrode structure. If the ratio of the width 'a' of the pressure-blocking section 322 to the area 'S1' of the open end face 111 is too small, the overall contact area between the pressure-blocking section 322 and the electrode structure is too small, and the area 'S1' of the open end face 111 of the electrode structure is large, resulting in weak overall strength of the electrode structure. Stress in the pressure-blocking section 322 is prone to concentration, making it difficult to limit the electrode structure. If the ratio of the width 'a' of the pressure-blocking section 322 to the area 'S1' of the open end face 111 is too large, the pressure-blocking section 322 occupies the area of ​​the electrode structure and the external electrical connection of the battery. The top and external current-carrying areas of the electrode structure are small, affecting the overall current transmission rate of the battery, resulting in greater overall heat generation, and posing a short-circuit risk to the electrode structure and the battery casing 30.

[0077] Combination Figure 5 As shown, the width of the pressure-resistant section 322 can be represented as a, and the width a of the pressure-resistant section 322 can control its pressure-resistant ability on the pole structure.

[0078] The ratio of the width 'a' of the pressing section 322 to the area S1 of the opening end face 111 can be 0.0006, 0.0008, 0.001, 0.0015, 0.0016, 0.0018, 0.002, 0.0025, 0.0028, 0.003, 0.004, 0.005, 0.006, 0.007, 0.008, 0.009, or 0. 01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.14, 0.15, 0.16, 0.17, 0.18, 0.2, 0.24, 0.25, 0.26, 0.27, 0.28, 0.3, 0.34, 0.35, 0.36, 0.37, or 0.28, etc.

[0079] In one embodiment, the width a of the pressure section 322 is 1mm-8mm, which allows the pressure section 322 to have sufficient size to limit the electrode structure, thereby ensuring the stability of the electrode structure, and avoiding the width a of the pressure section 322 being too large, which would affect the manufacturing cost of the battery.

[0080] The width 'a' of the pressing section 322 can be 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, or 8mm, etc.

[0081] In one embodiment, such as Figure 5 As shown, the main body 10 has a clamping section 15. Along the direction perpendicular to the opening end face 111, the clamping section 15 and the pressing section 322 are coincidentally projected onto the same plane. The main body 10 and the pressing section 322 are partially coincidentally projected onto the same plane. The minimum thickness d1 of the clamping section 15 is 0.5mm-3mm, which can ensure that the pressing section 322 and the battery casing 30 can reliably fix the electrode structure through the clamping section 15, ensuring the fixing strength of the electrode structure, and also avoiding damage to the battery casing 30 caused by the electrode structure.

[0082] Combination Figure 5As shown, the minimum thickness of the clamping section 15 along the direction perpendicular to the opening end face 111 can be represented as d1. The minimum thickness d1 of the clamping section 15 can be 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.

[0083] In one embodiment, such as Figure 7 and Figure 8 As shown, the battery also includes a cell 40, which is disposed within the battery casing 30. At least one end of the cell 40 extends into a tab 41, which includes at least two single-layer tabs. The tab 41 is electrically connected to the terminal structure. The thickness of the single-layer tab is x, and S2 / x is 1100mm-600000mm, which can ensure the connection strength between the tab 41 and the terminal structure, ensure the current carrying capacity between them, and avoid damage to the tab 41 if it is too weak.

[0084] If the ratio of the area S2 of the connecting end face 12 to the thickness x of the single-layer electrode is too small, the electrical connection area between the connecting end face 12 and the electrode part 41 is too narrow, and local stress is prone to concentration, which may cause the electrode part 41 to tear. If the ratio of the area S2 of the connecting end face 12 to the thickness x of the single-layer electrode is too large, the single-layer electrode is weak and cannot withstand the force, which may lead to bending deformation and tearing.

[0085] The thickness x of a single-layer electrode can be 3μm-17μm. For example, the thickness x of a single-layer electrode can be 3μm, 4μm, 5μm, 6μm, 8μm, 10μm, 15μm, 16μm or 17μm, etc.

[0086] The ratio of the area S2 of the connecting end face 12 to the thickness x of the single-layer electrode tab can be 1100mm, 1200mm, 1300mm, 1400mm, 1500mm, 1600mm, 1700mm, 1800mm, 2000mm, 2500mm, 2800mm, 3000mm, 4000mm, 5000mm, 6000mm, 7000mm, 8000mm, 9000mm, 10000mm, 11000mm, 15000mm, 20000mm, 25000mm, 30000mm, 40000mm, 50000mm, 60000mm, 70000mm, 80000mm, 9 0000mm, 100000mm, 110000mm, 120000mm, 150000mm, 180000mm, 200000mm, 210000mm, 220000mm, 250000mm, 280000mm, 300000mm, 310000mm, 320000mm, 350000mm, 380000mm, 400000mm, 410000mm, 420000mm, 450000mm, 480000mm, 500000mm, 510000mm, 520000mm, 550000mm, 580000mm, or 600000mm, etc.

[0087] One embodiment of this utility model also provides a battery, combined with Figures 1 to 10 As shown, the battery includes the battery housing assembly described above. The battery also includes a cell 40, which is disposed inside the battery housing 30, and the terminal structure is electrically connected to the cell 40.

[0088] One embodiment of the present invention includes a battery casing assembly and a battery cell 40. The battery cell 40 is disposed within the battery casing 30. An electrode structure is electrically connected to the battery cell 40 and is disposed on the battery casing 30. The electrode structure includes a main body 10, and the main body 10 has a groove 11 formed therein. This can reduce the overall production cost of the electrode structure. The area of ​​the opening end face 111 of the groove 11 is S1, the area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is S2, the depth of the groove 11 is h1, and the distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is h2. By making (S1×h1) / (S2×h2) 0.05-15, not only can the manufacturing cost of the main body 10 be effectively controlled, but the main body 10 can also have a certain structural strength. This ensures the overall current carrying capacity without increasing the risk of deformation of the battery casing 30 due to excessive strength, thereby reliably improving the safe use performance of the battery.

[0089] In one embodiment, such as Figures 7 to 9As shown, the battery also includes a cell 40, which is disposed within the battery casing 30. At least one end of the cell 40 extends into a tab portion 41. The tab portion 41 includes at least two single-layer tabs, and at least one single-layer tab has a protrusion 42 on its surface. The protrusion 42 has a size of 20μm-200μm along the direction perpendicular to the large surface of the single-layer tab after it has been flattened. This ensures the connection strength between the tab portion 41 and the terminal structure while avoiding the protrusion 42 being too large, which would affect the fit between the single-layer tabs and avoid the risk of poor welding in subsequent welding. This ensures the connection capability between the tab portion 41 and the terminal structure, and thus ensures the current carrying capacity between the tab portion 41 and the terminal structure.

[0090] At least one single-layer electrode has a protrusion 42 on its surface, which means that after the single-layer electrode is flattened along the lead end, the protrusion 42 protrudes from the large surface of the single-layer electrode. The dimensions of the protrusion 42 along the direction perpendicular to the large surface area after the monolayer tab is flattened can be 20μm, 25μm, 30μm, 35μm, 40μm, 45μm, 50μm, 55μm, 60μm, 65μm, 70μm, 75μm, 80μm, 85μm, 90μm, 95μm, 100μm, 125μm, 130μm, 135μm, 140μm, 145μm, 150μm, 155μm, 160μm, 165μm, 170μm, 175μm, 180μm, 185μm, 190μm, 195μm, or 200μm, etc. One or more protrusions 42 can be provided on the surface of the monolayer tab.

[0091] In one embodiment, such as Figure 7 As shown, the battery also includes a cell 40, which is disposed within the battery casing 30. At least one end of the cell 40 extends into a tab 41, which includes at least two single-layer tabs. The tab 41 is directly welded to the terminal structure for electrical connection, meaning that the tab 41 and the terminal structure can be connected without intermediate structures such as adapters. This reduces the number of batteries used, thereby reducing the overall weight of the battery and ensuring the energy density of the battery.

[0092] The tab 41 and the pole post structure can be connected by resistance welding, or the tab 41 and the pole post structure can be connected by laser welding, etc.

[0093] It should be noted that in some embodiments, it is not excluded that the tab 41 and the pole post structure can be connected by an adapter piece.

[0094] In one embodiment, the tab 41 is electrically connected to the connection end face 12 of the terminal structure near the cell 40 by welding, and S1 / S2≤4.8. This ensures that the area S2 of the connection end face 12 is guaranteed, avoiding stress concentration in the tab 41 due to a small contact area between the tab 41 and the connection end face 12, thereby ensuring the connection stability between the tab 41 and the terminal structure and improving the safe use performance of the battery.

[0095] One or more battery cells 40 may be installed inside the battery casing 30, which is not limited here.

[0096] It should be noted that a battery comprises a cell and an electrolyte, and is the smallest unit capable of electrochemical reactions such as charging / discharging. A cell refers to a unit formed by winding or laminating stacked portions, which include a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarities of the first and second electrodes can be interchanged. Both the first and second electrodes are coated with active material. The tabs of the cell can be electrically connected to the terminal structure; for example, the tabs of the cell can be directly connected to the terminal structure, or the tabs of the cell can be electrically connected to the terminal structure via adapter tabs.

[0097] In one embodiment, the battery can be a prism-shaped battery. A prism-shaped battery mainly refers to a battery with a prism shape, but it is not strictly limited that each side of the prism must be a straight line in the strict sense, and the corners between the sides do not have to be right angles, but can be rounded.

[0098] The battery can be a stacked battery, which is not only convenient to assemble, but also allows for the production of longer batteries. Specifically, the cell is a stacked cell, which has a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator between the first and second electrodes, thereby stacking multiple pairs of first and second electrodes to form a stacked cell.

[0099] Alternatively, the battery can be a wound battery, in which a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes are wound together to obtain a wound battery cell.

[0100] In one embodiment, the battery can be a cylindrical battery, or it can be a hexagonal prism battery. The battery can be a wound battery, in which a first electrode, a second electrode with the opposite electrical charge to the first electrode, and a separator disposed between the first and second electrodes are wound together to obtain a wound battery cell.

[0101] It should be noted that extreme thrust tests can be performed on the above-mentioned batteries to determine whether they meet the safety requirements for battery use.

[0102] Test method:

[0103] 1. The terminal structure is installed on the battery housing 30. Furthermore, the terminal structure can be riveted to the cover plate of the battery housing 30.

[0104] 2. The above-mentioned battery was subjected to a thrust test using a D-series electronic universal testing machine from China Machinery Testing Equipment Co., Ltd. (for example, an electronic universal testing machine with specifications of DF13.204D / DF13.204T can be selected);

[0105] 3. Secure the cover plate to the thrust machine;

[0106] 4. Use a thrust machine to apply thrust along the Z-axis at a speed of 50 mm / min until the pole column structure falls off and record the peak thrust value.

[0107] 5. A maximum thrust of less than 1000N does not meet the safety requirements for battery use.

[0108]

[0109]

[0110] In the table above, the unit of S1×h1 is mm. 3 The unit of S2×h2 is mm. 3 The unit of ultimate thrust is N.

[0111] One embodiment of this utility model also provides a battery pack, including the battery described above.

[0112] One embodiment of the present invention includes a battery, which includes a terminal structure and a battery casing 30. The terminal structure is disposed on the battery casing 30 and includes a main body 10. The main body 10 has a groove 11, which can reduce the overall production cost of the terminal structure. The area of ​​the opening end face 111 of the groove 11 is S1, the area of ​​the connecting end face 12 of the main body 10 away from the groove 11 is S2, the depth of the groove 11 is h1, and the distance between the bottom wall 112 of the groove 11 and the connecting end face 12 is h2. By making (S1×h1) / (S2×h2) 0.02-30, not only can the manufacturing cost of the main body 10 be effectively controlled, but the main body 10 can also have a certain structural strength. This ensures the overall current carrying capacity without increasing the risk of deformation of the battery casing 30 due to excessive strength, thereby reliably improving the safe use performance of the battery pack.

[0113] In one embodiment, the battery pack is a battery module or a battery pack.

[0114] The battery module includes multiple batteries, and may also include end plates and side plates for fixing the multiple batteries.

[0115] It should be noted that multiple batteries can be assembled into a battery module and then installed inside the battery box. These batteries can be secured using end plates and side plates. Alternatively, multiple batteries can be directly installed inside the battery box without needing to be grouped together; in this case, the end plates and side plates can be removed.

[0116] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and exemplary embodiments are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0117] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of protection of this disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that, The battery housing assembly includes a battery housing (30) and a terminal structure. The terminal structure is disposed on the battery housing (30). The terminal structure includes a main body (10). The main body (10) has a groove (11) formed therein. The groove (11) has an open end face (111). The area of ​​the connecting end face (12) of the main body (10) away from the groove (11) is S2. The battery also includes a cell (40), which is disposed inside the battery casing (30). The electrode structure is electrically connected to the cell (40). At least one end of the cell (40) extends into a tab portion (41). The tab portion (41) includes at least two single-layer tabs. The tab portion (41) is electrically connected to the electrode structure. The thickness of the single-layer tab is x, and S2 / x is 1100mm-600000mm.

2. The battery according to claim 1, characterized in that, 18mm 2 ≤S2≤1900mm 2 。 3. The battery according to claim 1, characterized in that, The maximum area enclosed by the circumferential outer surface of the main body (10) is S3, and 1.1≤S3 / S2≤6.

4. The battery according to claim 1, characterized in that, The groove (11) includes a first section (113) and a second section (114), the first section (113) and the second section (114) are connected, the first section (113) has a bottom wall (112), and the second section (114) has the opening end face (111); Wherein, the area of ​​the open end face (111) is greater than the area of ​​the bottom wall (112), and / or, the area enclosed by the circumferential outer edge of the bottom end of the second segment (114) is greater than the area of ​​the bottom wall (112).

5. The battery according to claim 4, characterized in that, The ratio of the area of ​​the open end face (111) to the area of ​​the bottom wall (112) is 1.2-9, and / or the ratio of the area S4 enclosed by the circumferential outer edge of the bottom end of the second segment (114) to the area S5 of the bottom wall (112) is 1.02-4.

6. The battery according to claim 1, characterized in that, The distance between the open end face (111) and the outermost circumferential edge of the end of the main body (10) having the open end face (111) is m, 0.1mm≤m≤5mm.

7. The battery according to claim 1, characterized in that, The pole structure also includes a shield (20), which is disposed in the groove (11).

8. The battery according to claim 1, characterized in that, The battery housing (30) is provided with a terminal through hole (31), and at least a portion of the main body (10) passes through the terminal through hole (31). The battery housing (30) is provided with a fixing part (32), and at least a portion of the fixing part (32) is arranged around the terminal through hole (31). The fixing part (32) is bent into a connecting section (321) and a pressing section (322). The connecting section (321) is arranged on the battery housing (30), and the pressing section (322) is pressed on the main body (10) so that the main body (10) is clamped between the pressing section (322) and the battery housing (30).

9. The battery according to claim 8, characterized in that, The area of ​​the through hole (31) of the pole post is not less than S2.

10. The battery according to claim 8, characterized in that, The minimum thickness of the fixing part (32) is 0.3mm-1.5mm, and / or the width a of the pressing section (322) is 1mm-8mm.

11. The battery according to claim 8, characterized in that, The main body (10) has a clamping section (15). Along the direction perpendicular to the opening end face (111), the clamping section (15) and the pressing section (322) are projected onto the same plane. The main body (10) and the pressing section (322) are partially projected onto the same plane. The minimum thickness d1 of the clamping section (15) is 0.5mm-3mm.

12. The battery according to any one of claims 1 to 11, characterized in that, At least one end of the battery cell (40) extends into a tab portion (41), the tab portion (41) includes at least two single-layer tabs, and at least one of the single-layer tabs has a protrusion (42) on its surface, the protrusion (42) having a size of 20μm-200μm along the direction perpendicular to the large surface of the single-layer tab after it has been flattened.

13. The battery according to any one of claims 1 to 11, characterized in that, At least one end of the battery cell (40) extends into a tab (41), the tab (41) comprising at least two single-layer tabs, the tab (41) being directly welded to the electrode structure for electrical connection.

14. The battery according to claim 13, characterized in that, The tab (41) is electrically connected to the connection end face (12) of the electrode structure near the cell (40) by welding.

15. The battery according to any one of claims 1 to 11, characterized in that, The battery is a prism-shaped battery.

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