Battery cell housing and battery cell

Abstract

The application belongs to the technical field of batteries, and specifically discloses a battery cell shell and a battery cell. The battery cell shell comprises a first packaging part and a second packaging part arranged at an included angle. A first accommodating cavity is formed in the first packaging part, and a second accommodating cavity in communication with the first accommodating cavity is formed in the second packaging part. The first accommodating cavity and the second accommodating cavity can be used for mounting a battery cell pole group. The volume of the battery cell pole group is large, and the energy density and assembly of the battery cell are high. An avoiding space can be formed between the first packaging part and the second packaging part, the irregular mounting space in the automobile floor or other electric devices can be reasonably utilized, and other components in the automobile floor or other electric devices can be avoided, so that the space utilization rate is high. The application provides a battery cell comprising the above battery cell shell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cell housing and a cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their capacity and safety. Among these, the battery cell is the core component of a lithium-ion battery, and its structural design is crucial to its safety.

[0003] Currently, the existing battery cell casings are generally regular cuboid structures. When the battery cell needs to be installed in some irregular spaces, the shape of the battery cell casing cannot be adapted. Moreover, the openings of the battery cell casing used to cooperate with the battery cell cover are generally planar structures, which cannot match the shapes of some specially designed battery cell cover plates and battery cell electrode groups. This results in low space utilization and low battery cell capacity and assembly ratio. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell housing and a battery cell that can be adapted to be installed in some irregular installation spaces. Moreover, the internal space of the battery cell housing is large enough to accommodate a large volume of battery cell electrode assembly, and the battery cell has a high capacity and high assembly ratio.

[0005] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a battery cell housing, comprising: A first encapsulation portion, wherein a first accommodating cavity is formed within the first encapsulation portion, and a first opening and a second opening are respectively formed at both ends of the first encapsulation portion along its length, and both the first opening and the second opening are connected to the first accommodating cavity; The second encapsulation part is arranged at a non-flat angle with the first encapsulation part in a cross section perpendicular to the first direction. A second accommodating cavity is formed inside the second encapsulation part. One end of the second encapsulation part in the length direction is connected to the first accommodating cavity, and the other end of the second encapsulation part in the length direction forms a third opening, which is connected to the second accommodating cavity. The first direction is the thickness direction of the first encapsulation part and the second encapsulation part, the second direction is the length direction of the first encapsulation part, and the third direction is the length direction of the second encapsulation part.

[0006] Optionally, the first encapsulation portion includes two first panels, a first side panel, a second side panel, and a third side panel. The two first panels face each other along a first direction. The opposing sides of the first side panels along the first direction are connected to a first side panel on the side away from the second encapsulation portion in the width direction of the first panel. The opposing sides of the second side panel and the third side panel along the first direction are respectively connected to a second side panel on the side closer to the second encapsulation portion in the width direction of the first panel. The second side panel and the third side panel are respectively connected to two ends in the length direction of the second side panel. The width direction of the first panel is perpendicular to the second direction. The second encapsulation part includes two second panels, a fourth side panel, and a fifth side panel. The two second panels are opposite each other along a first direction, and each second panel is connected to a first panel. The fourth side panel and the fifth side panel are opposite each other along the width direction of the second panels. The fourth side panel is adjacent to and connected to the second side panel, and the fifth side panel is adjacent to and connected to the third side panel. The width direction of the second panel is perpendicular to the third direction. Wherein, along the second direction, the length of the second side plate is greater than the length of the third side plate; along the third direction, the length of the fourth side plate is equal to the length of the fifth side plate; the two first panels, the first side plate, and the second side plate form the first opening at the end of the first encapsulation part away from the second encapsulation part along the length direction; the two first panels, the first side plate, and the third side plate form the second opening at the end of the first encapsulation part close to the second encapsulation part along the length direction; and the two second panels, the fourth side plate, and the fifth side plate form the third opening at the end of the second encapsulation part away from the first encapsulation part along the length direction.

[0007] Optionally, in a cross section perpendicular to the first direction, the fourth side plate and the second side plate are arranged at an angle, and the angle between the fourth side plate and the second side plate is N; The range of N is: 75°≤N≤105°.

[0008] Optionally, both ends of the first panel along its length and the end of the second panel away from the first panel along its length are provided with extending flanges; wherein the length of the extending flange on the first panel along the second direction is H; The value range of H is: 10mm≤H≤80mm.

[0009] Optionally, the width of the first panel is equal to the width of the second panel, both being A; the width of the extended flange on the first panel along a direction perpendicular to the second direction is L; The relationship between L and A satisfies: 0.25 ≤ L / A ≤ 0.55.

[0010] Optionally, along the second direction, the distance between the two opposite sides of the two extended flanges located at both ends of the first panel in the length direction is E1; along the third direction, the distance between the extended flange at the end of the second panel in the length direction and the opposite side of the first side plate is E2. The relationship between E1 and E2 satisfies: 6mm≤E1-E2≤100mm.

[0011] Optionally, the length of the third side plate is W along the second direction; The value range of W is: 6mm≤W≤90mm.

[0012] Optionally, explosion-proof valves are provided on the first side plate, the second side plate, the fourth side plate, and the fifth side plate; Along the second direction, the distance between the center of the explosion-proof valve located on the second side plate and the end of the second side plate away from the second encapsulation part is K1, and the length of the second side plate is F1; The relationship between K1 and F1 satisfies: 0.4≤K1 / F1≤0.65.

[0013] Optionally, along the first direction, the thickness of the first encapsulation portion and the second encapsulation portion are equal, both being B; The value of B is in the range of 16mm≤B≤120mm.

[0014] On the other hand, the present invention provides a battery cell including the battery cell housing described in any of the above embodiments.

[0015] The beneficial effects of this invention are as follows: This invention provides a battery cell housing, including a first encapsulation portion and a second encapsulation portion. A first accommodating cavity is formed within the first encapsulation portion, and a first opening and a second opening are respectively formed at both ends along the length of the first encapsulation portion, both communicating with the first accommodating cavity. A second encapsulation portion is arranged at a non-flat angle to the first encapsulation portion, forming a second accommodating cavity within the second encapsulation portion. One end of the second encapsulation portion along its length communicates with the first accommodating cavity, and the other end along its length forms a third opening, which communicates with the second accommodating cavity. Both the first and second accommodating cavities can be used to install battery cell electrode assemblies. The battery cell electrode assemblies have a larger volume, resulting in higher energy density and assembly efficiency for the battery cell. Furthermore, the angled arrangement between the first and second encapsulation portions creates a clearance space, allowing for efficient use of irregular installation spaces in automotive floor panels or other electrical devices, while avoiding interference risks from other components in the automotive floor panel or other electrical devices, thus achieving high space utilization.

[0016] This invention provides a battery cell with an irregularly shaped housing that can adapt to battery electrode assemblies and cover plates of special shapes. Through a special structural design, the battery cell housing can be fitted into irregular installation spaces in automotive flooring or other electrical devices, thereby improving space utilization. Furthermore, the internal assembly space for the battery electrode assemblies is relatively large, resulting in high energy density and a high assembly ratio for the battery cell. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention from another perspective; Figure 3 This is a cross-sectional view of the battery cell housing provided in an embodiment of the present invention in a section perpendicular to the first direction; Figure 4 yes Figure 3 A magnified view of a section at point I; Figure 5 This is a front view of the battery cell housing provided in an embodiment of the present invention; Figure 6 This is a right view of the battery cell housing provided in an embodiment of the present invention; Figure 7 This is a rear view of the battery cell housing provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the battery cell structure provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the battery cell provided in an embodiment of the present invention from another perspective; Figure 10 This is a cross-sectional view of the battery cell provided in the embodiment of the present invention in a section perpendicular to the first direction; Figure 11 yes Figure 10 Enlarged view of a section at point II; Figure 12 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention.

[0019] In the picture: 100. Cell housing; 110. First encapsulation part; 1101. First opening; 1102. Second opening; 111. First panel; 112. First side plate; 113. Second side plate; 114. Third side plate; 120. Second encapsulation part; 1201. Third opening; 121. Second panel; 122. Fourth side plate; 123. Fifth side plate; 130. Extending flange; 140. Explosion-proof valve; 200, Cell electrode assembly; 210, First component; 220, Second component; 230, Extension boss; 240, Electrode tab; 300, Cell cover plate; 310, Encapsulation cover; 311, Cover plate body; 312, Protective protrusion; 320, First plastic part; 330, Connector; 340, Second plastic part; 341, Plastic part body; 342, Mating protrusion; 350, Terminal base plate; 360, Terminal body. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0024] like Figures 1-3 ,as well as Figures 8-10 As shown, this embodiment provides a cell housing 100, which, when assembled with a cell electrode assembly 200 and a cell cover plate 300, forms a cell. The cell housing 100 has an irregular shape, allowing it to adapt to cell electrode assemblies 200 and cell cover plates 300 with special shapes. Through its special structural design, the cell housing 100 can be adapted to be installed in irregular installation spaces in automotive flooring or other electrical devices, thereby improving space utilization. Furthermore, the cell housing 100 in this embodiment has a large internal assembly space for the cell electrode assembly 200, resulting in a high energy density and assembly ratio for the cell.

[0025] Specifically, see [link to relevant documentation] Figures 1-3 In this embodiment, the cell housing 100 has an L-shaped design. The cell housing 100 includes a first encapsulation portion 110 and a second encapsulation portion 120. A first accommodating cavity is formed within the first encapsulation portion 110. A first opening 1101 and a second opening 1102 are formed at both ends of the first encapsulation portion 110 along its length, and both openings 1101 and 1102 communicate with the first accommodating cavity. The second encapsulation portion 120 is positioned at a non-flat angle to the first encapsulation portion 110 in a cross-section perpendicular to the first direction. A second accommodating cavity is formed within the second encapsulation portion 120. One end of the second encapsulation portion 120 communicates with the first accommodating cavity along its length, and the other end forms a third opening 1201, which communicates with the second accommodating cavity. The aforementioned first direction refers to the thickness direction of the first encapsulation portion 110 and the second encapsulation portion 120, i.e. Figure 1 The X-axis direction is shown in the diagram; the second direction is the length direction of the first encapsulation part 110, that is... Figure 1 The Y-axis direction is shown in the diagram; the third direction is the length direction of the second packaging part 120, that is... Figure 1 The Z-axis direction is shown in the figure.

[0026] The first accommodating cavity formed within the first encapsulation portion 110 and the second accommodating cavity formed within the second encapsulation portion 120 can both be used to install the cell electrode assembly 200. The volume of the cell electrode assembly 200 within the cell housing 100 is relatively large, resulting in high energy density and assembly ratio of the cell. Furthermore, the first encapsulation portion 110 and the second encapsulation portion 120 are arranged at an angle, thus creating a clearance space between them. This allows for the efficient use of irregular installation spaces in the vehicle floor or other electrical devices, while avoiding interference risks from other components in the vehicle floor or other electrical devices, resulting in high space utilization.

[0027] As an optional technical solution, the first encapsulation part 110 in this embodiment includes two first panels 111, a first side plate 112, a second side plate 113, and a third side plate 114. The two first panels 111 are opposite each other along a first direction. The side of the first side plate 112 that is opposite each other along the first direction is connected to the first side of the first panel 111 that is away from the second encapsulation part 120 in the width direction. The width direction of the first panel 111 is perpendicular to the second direction. The side of the second side plate 113 and the third side plate 114 that are opposite each other along the first direction are respectively connected to the second side of the first panel 111 that is close to the second encapsulation part 120 in the width direction. The second side plate 113 and the third side plate 114 are respectively connected to the two ends in the length direction of the second side. The second encapsulation part 120 includes two second panels 121, a fourth side panel 122, and a fifth side panel 123. The two second panels 121 are opposite each other along a first direction, and each second panel 121 is connected to a first panel 111 and is coplanar. The fourth side panel 122 and the fifth side panel 123 are opposite each other along the width direction of the second panel 121, and the width direction of the second panel 121 is perpendicular to the third direction. The fourth side panel 122 is adjacent to and connected to the second side panel 113, and the fifth side panel 123 is adjacent to and connected to the third side panel 114.

[0028] Along the second direction, the length of the second side plate 113 is greater than the length of the third side plate 114. Along the third direction, the length of the fourth side plate 122 is equal to the length of the fifth side plate 123. The two first panels 111, the first side plate 112, and the second side plate 113 form a first opening 1101 at the end of the first encapsulation portion 110 away from the second encapsulation portion 120 along the length direction. The two first panels 111, the first side plate 112, and the third side plate 114 form a second opening 1102 at the end of the first encapsulation portion 110 near the second encapsulation portion 120 along the length direction. The two second panels 121, the fourth side plate 122, and the fifth side plate 123 form a third opening 1201 at the end of the second encapsulation portion 120 away from the first encapsulation portion 110 along the length direction. A cell cover plate 300 is assembled at each of the first opening 1101, the second opening 1102, and the third opening 1201, thereby encapsulating the cell electrode assembly 200 within the cell housing 100. Furthermore, the width and thickness of the first encapsulation part 110 and the second encapsulation part 120 are designed to be equal, so that the first opening 1101, the second opening 1102 and the third opening 1201 can be adapted to the cell cover plate 300 of the same specification, reducing the difficulty of assembly and processing.

[0029] Optionally, the cell housing 100 in this embodiment can be manufactured using the following process: First, a cylindrical structure with a rectangular cross-section is formed by aluminum extrusion. An opening is stamped on one side of the cylindrical structure, and the opposite side of the opening is bent to form an L-shaped cylindrical structure. One end of the L-shaped cylindrical structure forms a first encapsulation part 110, and the other end forms a second encapsulation part 120. Then, a third side plate 114 is stretched and formed at the opening, and the first front panel 111 and the first side plate 112 are also stretched. Finally, the ends of the first encapsulation part 110 and the second encapsulation part 120 in the length direction are cut into the required shapes, thereby completing the cell housing 100.

[0030] Furthermore, in this embodiment, the cell housing 100 is designed with equal wall thickness. The first panel 111, the first side panel 112, the second side panel 113, the third side panel 114, the second panel 121, the fourth side panel 122, and the fifth side panel 123 have equal thicknesses, all of which are T. The value of T ranges from 0.3mm to 1.2mm. For example, the value of T can be 0.3mm, 0.5mm, 0.8mm, 1.0mm, or 1.2mm, etc. By limiting the value of T to the above range, the mechanical strength of the cell housing 100 is ensured to be high, which can provide good protection for the cell electrode assembly 200. Of course, in other embodiments, the first panel 111 and the second panel 121 can also be designed with equal thicknesses, and the first side panel 112, the second side panel 113, the third side panel 114, the fourth side panel 122, and the fifth side panel 123 can also be designed with equal thicknesses, with the thickness of the first side panel 112 being slightly greater than the thickness of the first panel 111.

[0031] See also Figure 3 and Figure 4 In a cross-section perpendicular to the first direction, the fourth side plate 122 and the second side plate 113 are arranged at an angle, and the angle between the fourth side plate 122 and the second side plate 113 is N. That is, the angle between the central axes of the first encapsulation part 110 and the second encapsulation part 120 in the length direction is N. The value of N is in the range of 75°≤N≤105°. For example, the value of N can be 75°, 80°, 85°, 90°, 95°, 100° or 105°, etc. By limiting the value of N to the above range, the cell housing 100 is easy to form and a larger clearance space can be formed between the first encapsulation part 110 and the second encapsulation part 120, which facilitates the arrangement of the cell. In a special embodiment, the value of N can be set to 90°, that is, the first encapsulation part 110 and the second encapsulation part 120 are arranged perpendicularly, and the second direction is orthogonal to the third direction.

[0032] Furthermore, in this embodiment, each of the two ends of the length direction of each first panel 111 and the end of each second panel 121 away from the first panel 111 in the length direction are provided with an extension flange 130. An extension space is formed between two opposite extension flanges 130 along the first direction. The extension space is connected to the first accommodating cavity or the second accommodating cavity. The cell electrode assembly 200 can also be arranged in the extension space. The provision of the extension flange 130 further increases the volume of the internal space of the cell housing 100 (including the first accommodating cavity and the second accommodating cavity). The volume of the cell electrode assembly 200 is increased significantly, and the cell capacity is significantly improved.

[0033] For example, the length of the extended flange 130 on the first panel 111 along the second direction is H. The length of the extended flange 130 on the second panel 121 along the third direction is equal to the length of the extended flange 130 on the first panel 111 along the second direction, which is also H. The value of H is in the range of 10mm ≤ H ≤ 80mm. For example, the value of H can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, or 80mm, etc. By limiting the value of H to the above range, the volume of the extended space is larger, thereby increasing the volume of the cell electrode assembly 200 more significantly, and the cell capacity is significantly improved. If the value of H is too small, the volume of the internal space of the cell housing 100 increases less, and the cell capacity improvement is not significant; if the value of H is too large, the length of the extended flange 130 is too large, the structural strength decreases, deformation problems easily occur, and the reliability is reduced.

[0034] Optionally, the width of the first panel 111 is equal to the width of the second panel 121, both being A. Along a direction perpendicular to the second direction, the width of the extension flange 130 on the first panel 111 is L, and the relationship between L and A satisfies: 0.25 ≤ L / A ≤ 0.55. For example, the value of L / A can be 0.25, 0.35, 0.45, or 0.55, etc. By limiting the value of L / A within the above range, the extension space formed at the extension flange 130 is larger, effectively increasing the volume of the internal space of the cell housing 100, and making it easier to assemble the extension flange 130 with the cell cover plate 300. Along a direction perpendicular to the third direction, the width of the extension flange 130 on the second panel 121 is equal to the width of the extension flange 130 on the first panel 111, also being L.

[0035] Of course, in other embodiments, the shape of the extension flange 130 in the cross section perpendicular to the first direction can also be trapezoidal, with a beveled transition between the wide and narrow sides of the extension flange 130, and the wide side of the extension flange 130 connected to the first panel 111 or the second panel 121. This shape of the extension flange 130 can further increase the volume of the extension space, resulting in a better capacity increase.

[0036] See also Figure 3 and Figure 5 Along the second direction, the distance between the two opposing sides of the two extending flanges 130 located at both ends of the length direction of the first panel 111 is E1; along the third direction, the distance between the opposing sides of the extending flange 130 located at the end of the length direction of the second panel 121 and the first side plate 112 is E2; the relationship between E1 and E2 satisfies: 6mm ≤ E1 - E2 ≤ 100mm. For example, the value of E1 - E2 can be 6mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, or 100mm, etc. That is, the length of the first encapsulation part 110 of the cell housing 100 and the length of the second encapsulation part 120 can be set to be equal, and at this time the value of E1 - E2 is equal to H. The lengths of the first packaging portion 110 and the second packaging portion 120 of the cell housing 100 can also be set to be unequal, but it is necessary to ensure that the length difference between the two is not too large. Otherwise, the manufacturing difficulty of the cell housing 100 will increase, the product yield will decrease, the structural strength will decrease, and the reliability of the cell housing 100 will decrease.

[0037] Optionally, along the second direction, the length of the third side plate 114 is W, and the value of W is in the range of 6mm ≤ W ≤ 90mm. For example, the value of W can be 6mm, 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, or 90mm, etc. By limiting the value of W to the above range, the length of the third side plate 114 is longer, which facilitates subsequent assembly with the cell cover plate 300; otherwise, if the value of W is too small, the operating space at the second opening 1102 is small, making it difficult to position and weld with the cell cover plate 300, and the assembly yield will decrease; the value of W should also not be too large, otherwise the structural strength at this point will decrease, and more space will be required, which is not conducive to improving space utilization.

[0038] See also Figures 1-2 ,as well as Figures 5-7 In this embodiment, mounting holes are provided on the first side plate 112, the second side plate 113, the fourth side plate 122, and the fifth side plate 123, and explosion-proof valves 140 are installed in the mounting holes. Specifically, the explosion-proof valves 140 on the first side plate 112 and the second side plate 113 face each other along the width direction of the first panel 111, while the explosion-proof valves 140 on the fourth side plate 122 and the fifth side plate 123 face each other along the width direction of the second panel 121. By providing multiple explosion-proof valves 140, the venting path can be shortened, the venting rate accelerated, and the safety performance of the battery cell improved.

[0039] Optionally, along the second direction, the distance between the center of the explosion-proof valve 140 located on the second side plate 113 and the end of the second side plate 113 away from the second encapsulation part 120 is K1, and the length of the second side plate 113 is F1. The relationship between K1 and F1 satisfies: 0.4 ≤ K1 / F1 ≤ 0.65. For example, the value of K1 / F1 can be 0.40, 0.45, 0.50, 0.55, 0.60, or 0.65, etc. By limiting the value of K1 / F1 to the above range, sufficient spacing is ensured between the explosion-proof valve 140 and the end of the second side plate 113 in the length direction, avoiding excessive reduction in the structural strength of the second side plate 113 after opening the mounting hole. At the same time, it also makes the flow path of gas in the first accommodating cavity shorter when it is discharged, thus accelerating the exhaust rate.

[0040] Furthermore, the distance between the center of the explosion-proof valve 140 located on the fourth side plate 122 and the end of the fourth side plate 122 away from the first encapsulation part 110 is K2, and the length of the fourth side plate 122 is F2. The relationship between K2 and F2 satisfies: 0.4≤K2 / F2≤0.65. For example, the value of K2 / F2 can be 0.40, 0.45, 0.50, 0.55, 0.60, or 0.65, etc. The value of K2 / F2 can be equal to or different from K1 / F1. However, it is necessary to ensure that the value of K2 / F2 is within the above range, so as to ensure that there is a sufficient gap between the explosion-proof valve 140 and the end of the fourth side plate 122 in the length direction, to avoid excessive reduction in the structural strength of the fourth side plate 122 after the installation hole is opened, and at the same time, to make the flow path of gas in the second accommodating cavity shorter and accelerate the exhaust rate.

[0041] Optionally, along the first direction, the thickness of the first encapsulation portion 110 and the second encapsulation portion 120 is equal, both being B, and the value of B ranges from 16mm to 120mm. For example, the value of B can be 16mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, or 120mm, etc. By limiting the value of B to the above range, the thickness of the first encapsulation portion 110 and the second encapsulation portion 120 is larger, the volume of the first accommodating cavity and the second accommodating cavity is larger, and the volume of the cell electrode assembly 200 that can be accommodated is larger, resulting in a significant increase in capacity. Of course, the value of B should not be too small, otherwise the cell housing 100 and the matching cell cover plate 300 will be difficult to process, the cell housing 100 and the cell electrode group 200 will be easily scratched when assembled, and the structural strength of the cell housing 100 is low, making it prone to deformation. The value of B should not be too large either, otherwise the individual cells will be too thick and heavy, making it inconvenient to assemble them into groups.

[0042] This embodiment also provides a battery cell, see [link to example]. Figures 8-12 The battery cell includes the aforementioned battery cell housing 100, battery cell electrode assembly 200, and three battery cell cover plates 300. The battery cell housing 100 has a first opening 1101, a second opening 1102, and a third opening 1201. Each of the first opening 1101, second opening 1102, and third opening 1201 is connected to a battery cell cover plate 300. The battery cell electrode assembly 200 is encapsulated by the three battery cell cover plates 300 and the battery cell housing 100. The specially designed battery cell housing 100 ensures ample space for the battery cell electrode assembly 200, resulting in high battery cell capacity and a high assembly ratio. Furthermore, the battery cell housing 100 provides excellent positioning and protection for the battery cell electrode assembly 200, ensuring good battery cell safety performance.

[0043] See also Figure 9 , Figure 10 and Figure 12 In this embodiment, the cell electrode assembly 200 includes a first part 210 and a second part 220, which are electrically connected in series or in parallel. The first part 210 is disposed in a first accommodating cavity of the cell housing 100, and the second part 220 is disposed in a second accommodating cavity. Each end of the first part 210 along a second direction has an extending boss 230, and the end of the second part 220 along a third direction away from the first part 210 also has an extending boss 230. Each extending boss 230 mates with a set of extending flanges 130 opposite each other along a first direction, and the extending boss 230 is located within an extending space. Both sides of the extending boss 230 in the width direction are provided with tabs 240, which are used for electrical connection with the electrode base plate 350 on the cell cover plate 300. By providing multiple tabs 240, the heat generation at this location can be alleviated, avoiding the risk of overheating.

[0044] See also Figure 10 and Figure 11 In this embodiment, the cell cover plate 300 includes an encapsulation cover 310, a first plastic part 320, a connector 330, a second plastic part 340, a terminal base plate 350, and a terminal body 360. The terminal base plate 350, the second plastic part 340, the encapsulation cover 310, the first plastic part 320, and the connector 330 are stacked sequentially. The first plastic part 320 insulates the connector 330 from the encapsulation cover 310, and the second plastic part 340 insulates the encapsulation cover 310 from the terminal base plate 350. The terminal body 360 passes through the encapsulation cover 310, the first plastic part 320, and the connector 330. One end of the terminal body 360 is connected to the terminal base plate 350, and the other end of the terminal body 360 is connected to the connector 330.

[0045] The assembly structures of the first opening 1101, the second opening 1102, and the third opening 1201 are the same as those of the cell cover 300. The following description uses the assembly structure of the first opening 1101 with the cell cover 300 as an example. The four edges of the encapsulation cover 310 are welded to the edges of the first opening 1101, thereby encapsulating the cell electrode assembly 200 inside the cell housing 100. The encapsulation cover 310 includes a cover body 311 and a protective protrusion 312. The protective protrusion 312 is located at the middle position in the width direction (i.e., the direction perpendicular to the second direction) of the cover body 311. The second plastic part 340 includes a plastic part body 341 and a mating protrusion 342. The mating protrusion 342 is located at the middle position in the width direction of the plastic part body 341. The cover body 311 and the plastic part body 341 are stacked, and the protective protrusion 312 and the mating protrusion 342 are stacked. The pole base plate 350 is located on the side of the plastic part body 341 away from the cover body 311. The first plastic part 320 and the connector 330 are arranged sequentially on the side of the cover body 311 away from the second plastic part 340. Each cell cover plate 300 has two pole posts 360, which are respectively located on both sides of the protective protrusion 312. The pole posts 360 pass through the plastic body 341, the cover plate body 311, the first plastic part 320 and the connector 330.

[0046] The extension boss 230 is accommodated at the mating boss 342 of the second plastic part 340. Through the mating of the mating boss 342 and the extension boss 230, precise positioning between the cell cover 300 and the cell electrode assembly 200 is achieved. The connector 330 is used to connect to the busbar of the series / parallel cells. Since the electrode post 360 is located on the side of the protective boss 312, and along the height direction of the cell cover 300, the end faces of both the electrode post 360 and the connector 330 on the side away from the cell electrode assembly 200 are lower than the protective boss 312, this provides good protection for the connector 330 and the electrode post 360, preventing damage during the manufacturing process, improving the safety performance of the cell, and resulting in a good appearance for the cell. Furthermore, after the cells are assembled and welded to the busbar, the height of the busbar is also lower than the protective boss 312, saving assembly space for the battery module, increasing the module assembly rate, and thus improving the performance indicators of the battery module.

[0047] The following uses samples from some specific implementation cases to verify the relevant dimensional design of the above-mentioned cell housing 100. See Table 1 for details.

[0048] Table 1 As can be seen from the above results, the range of values ​​for parameters H, L / A, W, E1-E2, K1 / F1, N, T, and B in Examples 1 to 6 meets their corresponding size limitations. The yield rate of assembly between the cell electrode assembly 200 and the cell housing 100 is high. The positioning of the cell electrode assembly 200 within the cell housing 100 is accurate. After assembly, neither the cell electrode assembly 200 nor the cell housing 100 is deformed or damaged. The volume of the cell electrode assembly 200 is significantly increased, and the cell capacity is large, meeting the need for high energy storage. The working temperature at the tab 240 of the cell electrode assembly 200 is suitable, and the performance is good. The cell housing 100 is of good quality.

[0049] In Comparative Example 1, the value of parameter L / A is less than the minimum value of 0.25 ≤ L / A ≤ 0.55. At this time, the width of the extended flange 130 on the first panel 111 or the second panel 121 is relatively small, which is not conducive to increasing the volume of the first or second accommodating cavity in the cell housing 100. The volume increase of the cell electrode group 200 is not significant, the capacity improvement effect of the cell is poor, and the cell housing 100 product is defective.

[0050] In Comparative Example 2, the value of parameter L / A is greater than the maximum value of 0.25 ≤ L / A ≤ 0.55. At this time, the width ratio of the extended flange 130 on the first panel 111 or the second panel 121 is too large, the arrangement space on both sides of the protective protrusion 312 on the cell cover 300 that matches the extended flange 130 in the width direction is too small, the diameter of the electrode 360 ​​is limited, the current carrying capacity of the cell cover 300 is poor, and the cell housing 100 is defective.

[0051] In Comparative Example 3, the value of parameter W is less than the minimum value of 6mm≤W≤90mm. At this time, the operating space at the second opening 1102 is small, making it difficult to position and weld with the encapsulation cover 310 of the cell cover 300, resulting in a decrease in assembly yield and defective cell housing 100 products.

[0052] In Comparative Example 4, the value of parameter W is greater than the maximum value of 6mm≤W≤90mm. At this time, the molding difficulty at the second opening 1102 increases, the product yield decreases, and the assembly accuracy with the cell cover 300 is affected. Moreover, the first encapsulation part 110 is stretched to a large length at the second opening 1102, making it difficult to guarantee the wall thickness, reducing the structural strength, and resulting in defective cell housing 100 products.

[0053] In Comparative Example 5, the value of parameter E1-E2 is less than the minimum value of 6mm≤E1-E2≤100mm. At this time, the length difference between the first packaging part 110 and the second packaging part 120 is small, which reduces the increase in cell capacity and results in a defective cell casing 100.

[0054] In Comparative Example 6, the value of parameter E1-E2 is greater than the maximum value of 6mm≤E1-E2≤100mm. At this time, the length difference between the first packaging part 110 and the second packaging part 120 is too large, which increases the molding difficulty of the cell housing 100, reduces the product yield, increases the cost, and results in defective cell housing 100 products.

[0055] Taking all factors into consideration, when the dimensions of the cell housing 100 meet the above-mentioned dimensional requirements, a high yield rate for the assembly of the cell electrode assembly 200 and the cell housing 100 can be guaranteed, the structural strength of the cell housing 100 can be high, and the positioning of the cell electrode assembly 200 within the cell housing 100 can be accurate. After assembly, neither the cell electrode assembly 200 nor the cell housing 100 is deformed or damaged, the volume of the cell electrode assembly 200 is significantly increased, and the cell capacity is larger, meeting the needs of high energy storage.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell housing, characterized in that, The battery cell housing includes: A first encapsulation portion, wherein a first accommodating cavity is formed within the first encapsulation portion, and a first opening and a second opening are respectively formed at both ends of the first encapsulation portion along its length, and both the first opening and the second opening are connected to the first accommodating cavity; The second encapsulation part is arranged at a non-flat angle with the first encapsulation part in a cross section perpendicular to the first direction. A second accommodating cavity is formed inside the second encapsulation part. One end of the second encapsulation part in the length direction is connected to the first accommodating cavity, and the other end of the second encapsulation part in the length direction forms a third opening, which is connected to the second accommodating cavity. Wherein, the first direction is the thickness direction of the first packaging part and the second packaging part, the second direction is the length direction of the first packaging part, and the third direction is the length direction of the second packaging part.

2. The cell housing according to claim 1, characterized in that, The first encapsulation portion includes two first panels, a first side panel, a second side panel, and a third side panel. The two first panels face each other along a first direction. The opposing sides of the first side panels along the first direction are connected to a first side panel on the side away from the second encapsulation portion in the width direction of the first panel. The opposing sides of the second side panel and the third side panel along the first direction are respectively connected to a second side panel on the side closer to the second encapsulation portion in the width direction of the first panel. The second side panel and the third side panel are respectively connected to two ends in the length direction of the second side panel. The width direction of the first panel is perpendicular to the second direction. The second encapsulation part includes two second panels, a fourth side panel, and a fifth side panel. The two second panels are opposite each other along a first direction, and each second panel is connected to a first panel. The fourth side panel and the fifth side panel are opposite each other along the width direction of the second panels. The fourth side panel is adjacent to and connected to the second side panel, and the fifth side panel is adjacent to and connected to the third side panel. The width direction of the second panel is perpendicular to the third direction. Wherein, along the second direction, the length of the second side plate is greater than the length of the third side plate; along the third direction, the length of the fourth side plate is equal to the length of the fifth side plate; the two first panels, the first side plate, and the second side plate form the first opening at the end of the first encapsulation part away from the second encapsulation part along the length direction; the two first panels, the first side plate, and the third side plate form the second opening at the end of the first encapsulation part close to the second encapsulation part along the length direction; and the two second panels, the fourth side plate, and the fifth side plate form the third opening at the end of the second encapsulation part away from the first encapsulation part along the length direction.

3. The cell housing according to claim 2, characterized in that, In a cross section perpendicular to the first direction, the fourth side plate and the second side plate are arranged at an angle, and the angle between the fourth side plate and the second side plate is N; The range of N is: 75°≤N≤105°.

4. The cell housing according to claim 2, characterized in that, Both ends of the first panel along its length and the end of the second panel away from the first panel along its length are provided with extending flanges; wherein, the length of the extending flange on the first panel along the second direction is H; The value range of H is: 10mm≤H≤80mm.

5. The cell housing according to claim 4, characterized in that, The width of the first panel is equal to the width of the second panel, both being A; the width of the extended flange on the first panel along a direction perpendicular to the second direction is L; The relationship between L and A satisfies: 0.25 ≤ L / A ≤ 0.

55.

6. The cell housing according to claim 4, characterized in that, Along the second direction, the distance between the two extended flanges located at both ends of the first panel along its length direction and their opposite sides is E1; along the third direction, the distance between the extended flange located at the end of the second panel along its length direction and its opposite side of the first side plate is E2. The relationship between E1 and E2 satisfies: 6mm≤E1-E2≤100mm.

7. The cell housing according to claim 2, characterized in that, Along the second direction, the length of the third side plate is W; The value range of W is: 6mm≤W≤90mm.

8. The cell housing according to claim 2, characterized in that, An explosion-proof valve is provided on the first side plate, the second side plate, the fourth side plate, and the fifth side plate; Along the second direction, the distance between the center of the explosion-proof valve located on the second side plate and the end of the second side plate away from the second encapsulation part is K1, and the length of the second side plate is F1; The relationship between K1 and F1 satisfies: 0.4≤K1 / F1≤0.

65.

9. The cell housing according to claim 1, characterized in that, Along the first direction, the thickness of the first encapsulation portion and the second encapsulation portion are equal, both being B; The value of B is in the range of 16mm≤B≤120mm.

10. A battery cell, characterized in that, The cell housing includes any one of claims 1-9.

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