A battery cell housing and a battery cell

Abstract

This invention belongs to the field of battery technology, specifically disclosing a battery cell housing and a battery cell. The battery cell housing includes a first encapsulation portion, and a second encapsulation portion and a third encapsulation portion arranged at a non-flat angle to the first encapsulation portion. The third encapsulation portion is inclined in a direction away from the second encapsulation portion. A first accommodating cavity formed within the first encapsulation portion, a second accommodating cavity formed within the second encapsulation portion, and a third accommodating cavity formed within the third encapsulation portion can all be used to install battery cell electrode assemblies. The volume of the battery cell electrode assemblies within the battery cell housing is relatively large, resulting in high energy density and assembly efficiency for the battery cell. Furthermore, the battery cell housing can effectively utilize irregular installation spaces in the vehicle floor or other electrical devices, while avoiding interference with other components in the vehicle floor or other electrical devices, achieving high space utilization. This invention provides a battery cell, including the aforementioned battery cell housing.

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 the length direction, and both the first opening and the second opening are in communication with 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 encapsulation part, and the other end of the second encapsulation part in the length direction forms a third opening, which communicates with the second accommodating cavity. The third encapsulation part is arranged at a non-flat angle with the first encapsulation part in a cross section perpendicular to the first direction, and the third encapsulation part and the second encapsulation part are inclined in opposite directions. A third accommodating cavity is formed inside the third encapsulation part. One end of the third encapsulation part in the length direction is connected to the first encapsulation part, and the other end of the third encapsulation part in the length direction forms a fourth opening, which communicates with the third accommodating cavity. Wherein, the first direction is the thickness direction of the first package portion, the second direction is the length direction of the first package portion, and the third direction is the width direction of the first package portion.

[0006] Optionally, the first encapsulation part includes two first panels and two first side panels, the two first panels facing each other along a first direction, the two first side panels facing each other along a third direction, and one of the first side panels is provided with a first interface and a second interface; The second encapsulation part includes two second panels, a second side plate, and a third side plate. The two second panels are opposite each other along a first direction, and the second side plate and the third side plate are opposite each other along the width direction of the second encapsulation part. The third side plate is located on the side closer to the third encapsulation part. The third side plate includes a first straight section and a first inclined section. The first straight section is perpendicular to the first side plate, and the first inclined section is parallel to the second side plate. The ends of the two second panels near the first encapsulation part, and the ends of the second side plate and the first straight section near the first encapsulation part form a third interface. The third interface is welded to the first interface after being assembled. The third encapsulation part includes two third panels, a fourth side plate, and a fifth side plate. The two third panels are opposite each other along a first direction, and the fourth and fifth side plates are opposite each other along the width direction of the third encapsulation part. The fifth side plate is located on the side closer to the second encapsulation part. The fifth side plate includes a second straight section and a second inclined section. The second straight section is perpendicular to the first side plate, and the second inclined section is parallel to the fourth side plate. The ends of the two third panels near the first encapsulation part, and the ends of the fourth side plate and the second straight section near the first encapsulation part form a fourth interface. The fourth interface is assembled with the second interface and then welded together. Wherein, the angle between the first inclined segment and the second inclined segment is N2; The range of N2 is: 70°≤N2≤120°.

[0007] Optionally, the length of the first interface and the second interface along the second direction is F, and the width of the first encapsulation part along the third direction is A; The relationship between F and A satisfies: 8mm≤FA≤40mm.

[0008] Optionally, along the second direction, the interval between the first straight segment and the second straight segment is K; The relationship between K and A satisfies: 0.75≤K / A≤6.

[0009] Optionally, the width of the first panel along a third direction, the width of the second panel along a direction perpendicular to its extension, and the width of the third panel along a direction perpendicular to its extension are equal; each of the first panels has a first extending flange at both ends along a second direction; each of the second panels has a second extending flange on the side of its length direction away from the first encapsulation portion; each of the third panels has a third extending flange on the side of its length direction away from the first encapsulation portion; the first extending flange, the second extending flange, and the third extending flange have the same shape and size design; Wherein, along the second direction, the length of the first extending flange is H; The value range of H is: 10mm≤H≤80mm.

[0010] Optionally, the first extending flange includes a top edge and a sloped edge, the top edge being parallel to a first side edge along the length of the first panel, and the sloped edge being at an angle to the top edge; the angle between the top edge and the sloped edge is N1; The range of N1 is: 105°≤N1≤150°.

[0011] Optionally, along a third direction, the width of the top edge is L, and the width of the first encapsulation portion is A; The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.65.

[0012] Optionally, two explosion-proof valves are provided on a first side plate in the first encapsulation part that is away from the second encapsulation part and the third encapsulation part along a third direction, and the two explosion-proof valves are spaced apart along a second direction; Along the second direction, the distance between the centers of the two explosion-proof valves is W, and the distance between the two first extended flanges on opposite sides is E1; The relationship between W and E1 satisfies: 0.45≤W / E1≤0.7.

[0013] Optionally, the second encapsulation portion and the third encapsulation portion are designed symmetrically about the central axis of the first encapsulation portion in a third direction; Along the extending direction of the second encapsulation portion, the length of the first inclined segment is E2; The relationship between E1 and E2 satisfies: 0.25≤E2 / E1≤0.6.

[0014] On the other hand, the present invention provides a battery cell including the battery cell housing of 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, a second encapsulation portion, and a third encapsulation portion. The second and third encapsulation portions are both arranged at non-flat angles to the first encapsulation portion in a cross-section perpendicular to a first direction, and the third encapsulation portion is inclined in a direction away from the second encapsulation portion. The first, second, and third encapsulation portions form a battery cell housing with a "K"-shaped design. The first cavity formed within the first encapsulation portion, the second cavity formed within the second encapsulation portion, and the third cavity formed within the third encapsulation portion can all be used to install battery cell electrode assemblies. The volume of the battery cell electrode assemblies within the battery cell housing is relatively large, resulting in high energy density and assembly efficiency of the battery cell. Furthermore, the first and second encapsulation portions are arranged at an angle, and the third encapsulation portion is arranged at an angle to the first encapsulation portion. Therefore, this battery cell housing can rationally utilize 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, including the aforementioned battery cell housing, which is adaptable to battery electrode assemblies and battery cover plates of special shapes. Through a special structural design, the battery cell housing can be adapted for installation in irregular spaces within automotive floorboards 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 front view of the battery cell housing provided in an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view of section I-I; Figure 4 yes Figure 3 Enlarged view of a section at point II; Figure 5 yes Figure 3 Enlarged view of a section at point III; Figure 6 This is a right view of the battery cell housing provided in an embodiment of the present invention; Figure 7This is a schematic diagram of the structure of the first packaging part provided in an embodiment of the present invention; Figure 8 This is a top view of the second packaging section provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; 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 IV; 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 casing; 110. First encapsulation part; 1101. First opening; 1102. Second opening; 1103. First interface; 1104. Second interface; 111. First panel; 112. First side plate; 113. First extending flange; 1131. Top edge; 1132. Bevel; 120. Second encapsulation part; 1201. Third opening; 1202. Third interface; 121. Second panel; 122. Second side plate; 123. Third side plate; 1231. First straight section; 1232. First inclined section; 124. Second extending flange; 130. Third encapsulation part; 1301. Fourth opening; 1302. Fourth interface; 131. Third panel; 132. Fourth side plate; 13 3. Fifth side plate; 1331. Second straight section; 1332. Second inclined section; 134. Third extending flange; 140. Explosion-proof valve; 200. Cell electrode assembly; 210. First split part; 211. First extension part; 2111. First boss; 2112. Second boss; 220. Second split part; 221. Second extension part; 230. Third split part; 231. Third extension part; 240. Electrode tab; 300. Cell cover plate; 310. Encapsulation cover; 311. First protective protrusion; 312. Second protective protrusion; 320. First plastic part; 330. Connector; 340. Second plastic part; 341. First mating protrusion; 342. Second mating protrusion; 350. Electrode base plate; 360. Electrode 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 9-10 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] See also Figures 1-3In this embodiment, the cell housing 100 has a K-shaped design and includes a first encapsulation portion 110, a second encapsulation portion 120, and a third encapsulation portion 130. The first encapsulation portion 110 forms a first accommodating cavity, and its two ends along its length form a first opening 1101 and a second opening 1102, both communicating 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. The second encapsulation portion 120 forms a second accommodating cavity, one end of its length is connected to the first encapsulation portion 110, and the other end forms a third opening 1201, which communicates with the second accommodating cavity. The third encapsulation portion 130 is disposed at a non-flat angle to the first encapsulation portion 110 in a cross section perpendicular to the first direction, and the third encapsulation portion 130 and the second encapsulation portion 120 are inclined in opposite directions. A third accommodating cavity is formed within the third encapsulation portion 130. One end of the third encapsulation portion 130 in the length direction is connected to the first encapsulation portion 110, and the other end of the third encapsulation portion 130 in the length direction forms a fourth opening 1301, which communicates with the third accommodating cavity. The aforementioned first direction is the thickness direction of the first encapsulation portion 110, that is... 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 width direction of the first packaging part 110, that is... Figure 1 The Z-axis direction is shown in the figure.

[0026] The first accommodating cavity formed in the first encapsulation portion 110, the second accommodating cavity formed in the second encapsulation portion 120, and the third accommodating cavity formed in the third encapsulation portion 130 can all be used to install the cell electrode assembly 200. The volume of the cell electrode assembly 200 inside 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, forming a first clearance space between them; the second encapsulation portion 120 and the third encapsulation portion 130 are arranged at an angle, forming a second clearance space between them; and the third encapsulation portion 130 and the first encapsulation portion 110 are arranged at an angle, thus forming a third clearance space between them. Therefore, by setting up the first, second, and third clearance spaces, irregular installation spaces in the vehicle floor or other electrical devices can be made reasonable, while avoiding other components in the vehicle floor or other electrical devices, thus avoiding the risk of interference and achieving a high space utilization rate.

[0027] As an optional solution, see [link to relevant documentation]. Figure 3 , Figure 4 and Figure 8 The first encapsulation part 110 includes two first panels 111 and two first side panels 112. The two first panels 111 are opposite each other along a first direction, and the two first side panels 112 are opposite each other along a third direction. The first side panel 112 near the second encapsulation part 120 and the third encapsulation part 130 is provided with a first interface 1103 and a second interface 1104. The second encapsulation part 120 includes two second panels 121, a second side plate 122, and a third side plate 123. The two second panels 121 are opposite each other along a first direction, and the second side plate 122 and the third side plate 123 are opposite each other along the width direction of the second encapsulation part 120. The third side plate 123 is located on the side close to the third encapsulation part 130. The third side plate 123 includes a first straight segment 1231 and a first inclined segment 1232. The first straight segment 1231 is perpendicular to the first side plate 112, and the first inclined segment 1232 is parallel to the second side plate 122. The two second panels 121 and the second side plate 122 and the first straight segment 1231 near the first encapsulation part 110 form a third interface 1202. The third interface 1202 and the first interface 1103 are assembled and welded together, thereby connecting the first accommodating cavity and the second accommodating cavity. The third encapsulation part 130 includes two third panels 131, a fourth side plate 132, and a fifth side plate 133. The two third panels 131 are opposite each other along a first direction, and the fourth side plate 132 and the fifth side plate 133 are opposite each other along the width direction of the third encapsulation part 130. The fifth side plate 133 is located on the side close to the second encapsulation part 120. The fifth side plate 133 includes a second straight section 1331 and a second inclined section 1332. The second straight section 1331 is perpendicular to the first side plate 112, and the second inclined section 1332 is parallel to the fourth side plate 132. The two third panels 131 and the end of the fourth side plate 132 and the end of the second straight section 1331 close to the first encapsulation part 110 form a fourth interface 1302. The fourth interface 1302 and the second interface 1104 are assembled and welded together, thereby communicating between the first accommodating cavity and the third accommodating cavity.

[0028] By aligning the first straight segment 1231 perpendicular to the first side plate 112, the second encapsulation part 120 is easily positioned relative to the first encapsulation part 110, resulting in higher positioning accuracy during cell housing 100 assembly. This also improves the welding quality at the seam between the first interface 1103 and the third interface 1202, ensuring a reliable connection between the first encapsulation part 110 and the second encapsulation part 120. Similarly, by aligning the second straight segment 1331 perpendicular to the first side plate 112, the third encapsulation part 130 is easily positioned relative to the first encapsulation part 110, resulting in higher positioning accuracy during cell housing 100 assembly. This also improves the welding quality at the seam between the second interface 1104 and the fourth interface 1302, ensuring a reliable connection between the first encapsulation part 110 and the third encapsulation part 130.

[0029] Furthermore, in this embodiment, the included angle between the first inclined segment 1232 of the second encapsulation part 120 and the second inclined segment 1332 of the third encapsulation part 130 is N2, and the value range of N2 is: 70°≤N2≤120°. For example, the value of N2 can be 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115° or 120°, etc. By limiting the value of N2 to the above range, a larger second clearance space can be formed between the second encapsulation part 120 and the third encapsulation part 130, which is convenient for adapting to irregular installation spaces in automobile chassis or other electrical devices. It also facilitates welding operations at the first interface 1103 and the third interface 1202, and the second interface 1104 and the fourth interface 1302. The cell housing 100 is easy to assemble, and the yield rate of finished products is high.

[0030] Optionally, the lengths of the first interface 1103 and the second interface 1104 along the second direction are F, and the lengths of the third interface 1202 and the fourth interface 1302 that cooperate with the first interface 1103 and the second interface 1104 along the second direction are also F; the width of the first encapsulation portion 110 along the third direction is A, the width of the second encapsulation portion 120 along its extension direction perpendicular to it, and the width of the third encapsulation portion 130 along its extension direction perpendicular to it are also A. The relationship between F and A satisfies: 8mm ≤ FA ≤ 40mm. For example, the value of FA can be 8mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm, etc. By limiting the value of FA within the aforementioned range, the first packaging part 110 is easily assembled with the second packaging part 120 and the third packaging part 130, and the length of the third interface 1202 along the second direction is sufficiently large, resulting in a large contact area at the electrical connection between the first part 210 and the second part 220 of the cell electrode assembly 200, ensuring reliable connection; the length of the fourth interface 1302 along the second direction is sufficiently large, resulting in a large contact area at the electrical connection between the first part 210 and the third part 230 of the cell electrode assembly 200, ensuring reliable connection.

[0031] Along the second direction, the distance between the first straight segment 1231 and the second straight segment 1331 is K, and the relationship between K and A satisfies: 0.75 ≤ K / A ≤ 6. The value of K / A can be 0.75, 1, 2, 3, 4, 5, or 6, etc. By limiting the value of K / A within the above range, the distance between the second packaging part 120 and the third packaging part 130 along the second direction is larger, the operating space is larger, which facilitates the welding of the first interface 1103 of the first packaging part 110 and the third interface 1202 of the second packaging part 120. The positioning of the first packaging part 110 and the second packaging part 120 is accurate. The welding of the second interface 1104 of the first packaging part 110 and the fourth interface 1302 of the third packaging part 130 is also accurate, resulting in a higher yield of the battery cell housing 100. If the K / A value is too small, the spacing between the second encapsulation part 120 and the third encapsulation part 130 along the second direction is too small, resulting in a small operating space and inconvenient welding operation. At the same time, the spacing between the first interface 1103 and the second interface 1104 is too close, and the mechanical strength of the first side plate 112 of the first encapsulation part 110 is too weak, making it prone to deformation. If the K / A value is too large, the length of the first encapsulation part 110 needs to be set to be longer, making it difficult to guarantee the positioning accuracy. Moreover, the overall structural strength of the cell housing 100 decreases, requiring an increase in the mechanical strength of the first encapsulation part 110, the second encapsulation part 120, and the third encapsulation part 130. The first encapsulation part 110, the second encapsulation part 120, and the third encapsulation part 130 are set to be relatively thick and heavy, which is not conducive to the lightweight design of the cell.

[0032] See also Figure 3 and Figure 5 In some embodiments, the thicknesses of the first panel 111, the first side panel 112, the second panel 121, the second side panel 122, the third side panel 123, the third panel 131, the fourth side panel 132, and the fifth side panel 133 are all equal, and are all 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, making it less prone to deformation problems, and the cell housing 100 is not too thick and heavy, resulting in a smaller total weight of the cell.

[0033] See Figure 6Along the first direction, the thicknesses of the first encapsulation portion 110, the second encapsulation portion 120, and the third encapsulation portion 130 are equal, all being B. The value of B ranges from 20mm to 120mm. For example, the value of B can be 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, or 120mm. By limiting the value of B to the above range, the thicknesses of the first encapsulation portion 110, the second encapsulation portion 120, and the third encapsulation portion 130 are relatively large, the volumes of the first accommodating cavity, the second accommodating cavity, and the third accommodating cavity are relatively large, 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.

[0034] See also Figure 3 , Figure 5 and Figure 8 The width of the first panel 111 along the third direction, the width of the second panel 121 along the direction perpendicular to its extension, and the width of the third panel 131 along the direction perpendicular to its extension are all equal. The widths of the first side panel 112, the second side panel 122, the third side panel 123, the fourth side panel 132, and the fifth side panel 133 along the first direction are all equal. The assembled battery cell housing 100 has a regular shape and structure, and is easy to process and assemble.

[0035] Each first panel 111 has a first extending flange 113 at both ends along the second direction, and a first extending space is formed between two opposing first extending flanges 113 along the first direction. The first extending space communicates with the first receiving cavity. Each second panel 121 has a second extending flange 124 on the side of its length direction away from the first encapsulation portion 110, and a second extending space is formed between two opposing second extending flanges 124 along the first direction. The second extending space communicates with the second receiving cavity. Each third panel 131 has a third extending flange 134 on the side of its length direction away from the first encapsulation portion 110, and a third extending space is formed between two opposing third extending flanges 134 along the first direction. The third extending space communicates with the third receiving cavity. The cell electrode assembly 200 can also be arranged in the first extension space, the second extension space and the third extension space. The space inside the cell housing 100 (including the first accommodating cavity, the second accommodating cavity and the third accommodating cavity) is further increased by setting the first extension flange 113, the second extension flange 124 and the third extension flange 134. The volume of the cell electrode assembly 200 is increased significantly, and the cell capacity is significantly improved.

[0036] Furthermore, the first extending flange 113, the second extending flange 124, and the third extending flange 134 are designed with the same shape and size. As a result, the first opening 1101 and the second opening 1102 of the first encapsulation part 110, the third opening 1201 of the second encapsulation part 120, and the fourth opening 1301 of the third encapsulation part 130 can use the same specification of cell cover plate 300, which reduces the process window during cell assembly and reduces the assembly difficulty and manufacturing difficulty.

[0037] The following example illustrates the structure and dimensions of the first extended flange 113.

[0038] Optionally, along the second direction, the length of the first extending flange 113 is H, and 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 first extending space is larger, thereby increasing the volume of the cell electrode assembly 200 significantly and improving the cell capacity. If the value of H is too small, the volume increase of the internal space of the cell housing 100 is small, and the cell capacity improvement is not significant; if the value of H is too large, the length of the first extending flange 113 is too large, the structural strength decreases, deformation problems easily occur, and reliability is reduced.

[0039] The first extending flange 113 includes a top edge 1131 and a inclined edge 1132. The top edge 1131 is parallel to the first side edge along the length of the first panel 111, and the inclined edge 1132 is set at an angle to the top edge 1131. The angle between the top edge 1131 and the inclined edge 1132 is N1, and the value of N1 is in the range of 105°≤N1≤150°. For example, the value of N1 can be 105°, 110°, 115°, 120°, 125°, 130°, 135°, 140°, 145°, or 150°, etc. By limiting the value of N1 to the above range, the first extending flange 113 is easy to form. When the cell housing 100 and the cell cover plate 300 are assembled, the first extending flange 113 can play a good guiding role, so that the first encapsulation part 110 can be smoothly assembled with the cell cover plate 300, resulting in a high assembly yield. If the value of N1 is too small, the guiding effect of the first extended flange 113 will be poor, and the assembly yield will be reduced; if the value of N1 is too large, the length of the first extended flange 113 will be short, which is not conducive to increasing the volume of the first accommodating cavity, and the capacity increase effect of the battery cell will be poor.

[0040] Along the third direction, the width of the top edge 1131 is L, and the width of the first encapsulation portion 110 is A. The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.65. For example, the value of L / A can be 0.40, 0.45, 0.50, 0.55, 0.60, or 0.65, etc. By limiting the value of L / A within the above range, the top edge 1131 of the first extending flange 113 has a larger proportion in the width direction of the first encapsulation portion 110, the first extending space formed at the first extending flange 113 is larger, the volume of the internal space (i.e., the first accommodating cavity) of the first encapsulation portion 110 is effectively increased, and the first extending flange 113 is easy to assemble with the cell cover plate 300.

[0041] See 2. Figure 3 and Figure 7 Two explosion-proof valves 140 are provided on the first side plate 112 of the first packaging section 110, which is located on the side opposite to the second packaging section 120 and the third packaging section 130 along a third direction. The two explosion-proof valves 140 are spaced apart along a second direction and are symmetrical on the first side plate 112. By providing two explosion-proof valves 140, the exhaust path can be shortened, the exhaust rate can be accelerated, and the safety performance of the battery cell can be improved.

[0042] Along the second direction, the distance between the centers of the two explosion-proof valves 140 is W, and the distance between the two first extended flanges 113 on opposite sides is E1. The relationship between W and E1 satisfies: 0.45 ≤ W / E1 ≤ 0.7. For example, the value of W / E1 can be 0.45, 0.50, 0.55, 0.60, 0.65, or 0.70, etc. By limiting the value of W / E1 to the above range, the gap between the two explosion-proof valves 140 is ensured to be large enough, avoiding excessive reduction in the structural strength of the first side plate 112 after opening the mounting hole (for installing the explosion-proof valves 140). At the same time, it also makes the gap between the explosion-proof valves 140 and the ends of the first side plate 112 along the second direction larger, resulting in a shorter flow path for gas to exit the first accommodating cavity and accelerating the exhaust rate.

[0043] Optionally, the second encapsulation portion 120 and the third encapsulation portion 130 are designed symmetrically about the central axis of the first encapsulation portion 110 in a third direction. Along the extending direction of the second encapsulation portion 120, the length of the first inclined segment 1232 is E2, and the relationship between E1 and E2 satisfies: 0.25 ≤ E2 / E1 ≤ 0.6. For example, the value of E2 / E1 can be 0.25, 0.30, 0.35, 0.40, 0.45, 0.50, 0.55, or 0.60, etc. By limiting the value of E2 / E1 to the above range, the lengths of the second encapsulation portion 120 and the third encapsulation portion 130 are larger, the internal space of the cell housing 100 is larger, and the structural strength of the cell housing 100 is higher. If the value of E2 / E1 is too small, it will not be conducive to increasing the cell capacity, and the second packaging part 120 and the third packaging part 130 will not be easy to assemble with the first packaging part 110, making it difficult to guarantee positioning accuracy and welding yield. If the value of E2 / E1 is too large, the length of the second packaging part 120 and the third packaging part 130 will be too large, the structural strength of the cell housing 100 after assembly will decrease, and deformation problems will easily occur.

[0044] This embodiment also provides a battery cell, see [link / reference] Figures 9-11 The battery cell includes the aforementioned battery cell housing 100, battery cell electrode assembly 200, and four battery cell cover plates 300. The battery cell housing 100 has a first opening 1101, a second opening 1102, a third opening 1201, and a fourth opening 1301. Each of these openings is connected to a battery cell cover plate 300, and the battery cell electrode assembly 200 is encapsulated by the four 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.

[0045] See also Figure 10 and Figure 12In this embodiment, the cell electrode assembly 200 includes a first part 210, a second part 220, and a third part 230. One side of the first part 210 in the width direction is connected to the second part 220 and the third part 230, and the second part 220 and the third part 230 are inclined in a direction away from each other. Thus, the cell electrode assembly 200 also forms a K-shaped structure, which can be well adapted to the cell housing 100. When assembling the cell electrode assembly 200 with the cell housing 100, the first part 210 is first installed into the first receiving cavity of the first encapsulation part 110, the second part 220 is installed into the second receiving cavity of the second encapsulation part 120, and the third part 230 is installed into the third receiving cavity of the third encapsulation part 130. Then, the first part 210 and the second part 220 are electrically connected at the first interface 1103 and the third interface 1202, and the first part 210 and the third part 230 are electrically connected at the second interface 1104 and the fourth interface 1302.

[0046] Optionally, the first segment 210 has a first extension 211 at each end along the second direction, the second segment 220 has a second extension 221 at the end away from the first segment 210, and the third segment 230 has a third extension 231 at the end away from the first segment 210. The first extension 211, the second extension 221, and the third extension 231 have the same structure and size. The arrangement of the first extension 211, the second extension 221, and the third extension 231 increases the volume of the cell electrode assembly 200. At the same time, the first extension 211, the second extension 221, and the third extension 231 respectively cooperate with the first extension flange 113, the second extension flange 124, or the third extension flange 134. The first extension 211 is partially located in the first extension space, the second extension 221 is partially located in the second extension space, and the third extension 231 is partially located in the third extension space. The positioning between the cell electrode assembly 200 and the cell housing 100 is accurate, which is beneficial to improving the assembly yield.

[0047] The structure of the first extension 211 is described as an example. The first extension 211 includes a first boss 2111 and a second boss 2112. The shape of the first boss 2111 matches that of the first extension flange 113, and the second boss 2112 is used to cooperate with the corresponding position in the cell cover plate 300. The positioning between the cell electrode group 200 and the cell cover plate 300 is accurate.

[0048] Optionally, the first boss 2111 includes a first end face, and the second boss 2112 includes a second end face. Along the second direction, the first end face of the first boss 2111 is higher than the opposite end face of the first split body 210 along the second direction, and the second end face of the second boss 2112 is higher than the first end face of the first boss 2111. Each opposite end face of the first split body 210 along the second direction is provided with a tab 240, which extends along a third direction to the first end face of the first boss 2111. The tab 240 is used for electrical connection with the electrode base plate 350 on the cell cover 300. By extending the length of the tab 240 along the third direction, the total current-carrying area of ​​the tab 240 is increased, which can alleviate the heat generation at this location and avoid the risk of overheating.

[0049] See also Figure 10 and Figure 11 In this embodiment, the four cell cover plates 300 have the same structure. Taking one of the cell cover plates 300 that mates with the first encapsulation part 110 as an example, 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 second plastic part 340, 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.

[0050] The encapsulation cover 310 is welded to the edge of the first opening 1101, thereby encapsulating the cell electrode assembly 200 within the cell housing 100. The encapsulation cover 310 includes a first protective bump 311 and a second protective bump 312. The first protective bump 311 is located at the middle of the width direction of the encapsulation cover 310 (the third direction in this partial enlarged view), and the second protective bump 312 is located on the side of the first protective bump 311 near the second encapsulation portion 120 or the third encapsulation portion 130 along the third direction. The second plastic part 340 includes a first mating bump 341 and a second mating bump 342. The first protective bump 311 and the first mating bump 341 are stacked along a second direction, and the second protective bump 312 and the second mating bump 342 are stacked along a second direction. The first boss 2111 of the first extension 211 of the cell electrode assembly 200 is accommodated in the first mating bump 341, and the second boss 2112 of the first extension 211 is accommodated in the second mating bump 342. The precise positioning between the cell cover plate 300 and the cell electrode group 200 is achieved through the cooperation of the first mating protrusion 341 and the first protrusion 2111, and the cooperation of the second mating protrusion 342 and the second protrusion 2112.

[0051] Each cell cover 300 has two electrode posts 360. One electrode post 360 is located at the first protective protrusion 311, and the other electrode post 360 is located in the first split body 210 on the side away from the second protective protrusion 312 along a third direction. Since the electrode posts 360 are all located on the side of the second protective protrusion 312, and along the height direction of the cell cover 300 (i.e., the second direction), the end faces of the electrode posts 360 and the connectors 330 on the side away from the cell electrode group 200 are all lower than the second protective protrusion 312, this provides good protection for the connectors 330 and the electrode posts 360, avoiding damage during the manufacturing process, improving the safety performance of the cell, and resulting in a good appearance of the cell. Moreover, after the cells are grouped and welded to the busbar, the height of the busbar is also lower than the second protective protrusion 312, saving assembly space for the battery module, increasing the module assembly rate, and thus improving the performance indicators of the battery module.

[0052] The following uses samples from some specific implementation cases to verify the relevant dimensional design of the above-mentioned cell housing 100. For details, please refer to Table 1.

[0053] Table 1 As can be seen from the above results, the range of values ​​for parameters H, L / A, W / E1, K / A, E2 / E1, FA, N1, N2, T, and B in Examples 1 to 6 meets their corresponding size limitations. The yield rate of assembly between the cell electrode group 200 and the cell housing 100 is high. The positioning of the cell electrode group 200 within the cell housing 100 is accurate. After assembly, neither the cell electrode group 200 nor the cell housing 100 is deformed or damaged. The volume of the cell electrode group 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 group 200 is suitable, and the performance is good. The cell housing 100 is of good quality.

[0054] In Comparative Example 1, the value of parameter L / A is less than the minimum value of 0.4 ≤ L / A ≤ 0.65. At this time, the top edge 1131 of the first extended flange 113 has a small proportion in the width of the first package portion 110, which is not conducive to increasing the volume of the first accommodating cavity in the cell housing 100. The volume increase of the cell electrode group 200 is not obvious, the capacity improvement effect of the cell is not good, and the cell housing 100 product is defective.

[0055] In Comparative Example 2, the value of parameter L / A is greater than the maximum value of 0.4 ≤ L / A ≤ 0.65. At this time, the top edge 1131 of the first extended flange 113 has an excessive proportion in the width of the first encapsulation portion 110. The space occupied by the first protective protrusion 311 and the second protective protrusion 312 in the cell cover 300 that matches the first extended flange 113 in the cell housing 100 is too large. Therefore, the space of the encapsulation cover 310 on the side of the first protective protrusion 311 away from the second protective protrusion 312 in the third direction is too small. The diameter of the pole 360 ​​below the first protective protrusion 311 is limited, the current carrying capacity of the cell cover 300 is poor, and the cell housing 100 product is defective.

[0056] In Comparative Example 3, the value of parameter K / A is less than the minimum value of 0.75≤K / A≤6. At this time, the spacing between the second packaging part 120 and the third packaging part 130 along the second direction is too small, the operating space is small, and the welding operation is inconvenient. At the same time, the spacing between the first interface 1103 and the second interface 1104 is too close, the mechanical strength of the first side plate 112 of the first packaging part 110 is weak, and it is easy to deform. The battery cell housing 100 is defective.

[0057] In Comparative Example 4, the value of parameter K / A is greater than the maximum value of 0.75≤K / A≤6. At this time, the length of the first packaging part 110 needs to be set to be relatively long, the positioning accuracy is not easy to guarantee, and the overall structural strength of the cell housing 100 decreases. It is necessary to improve the mechanical strength of the first packaging part 110, the second packaging part 120 and the third packaging part 130. The first packaging part 110, the second packaging part 120 and the third packaging part 130 are set to be relatively thick and heavy, which is not conducive to the lightweight design of the cell, and the cell housing 100 product is defective.

[0058] In Comparative Example 5, the value of parameter E2 / E1 is less than the minimum value of 0.25 ≤ E2 / E1 ≤ 0.6. At this time, the lengths of the second packaging part 120 and the third packaging part 130 are too small, the internal space of the cell housing 100 is not increased much, the structural advantage is not obvious, it is not conducive to the improvement of cell capacity, and the cell housing 100 product is defective.

[0059] In Comparative Example 6, the value of parameter E2 / E1 is greater than the maximum value of 0.25 ≤ E2 / E1 ≤ 0.6. At this time, the length of the second packaging part 120 and the third packaging part 130 is too large, the structural strength decreases, and deformation problems are prone to occur. It is necessary to increase the thickness design of the first packaging part 110, the second packaging part 120 and the third packaging part 130. The cell housing 100 is relatively thick and heavy, and the assembly difficulty of the first packaging part 110, the second packaging part 120 and the third packaging part 130 of the cell housing 100 increases, resulting in product defects of the cell housing 100.

[0060] 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.

[0061] 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 the length direction, and both the first opening and the second opening are in communication with 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 encapsulation part, and the other end of the second encapsulation part in the length direction forms a third opening, which communicates with the second accommodating cavity. The third encapsulation part is arranged at a non-flat angle with the first encapsulation part in a cross section perpendicular to the first direction, and the third encapsulation part and the second encapsulation part are inclined in opposite directions. A third accommodating cavity is formed inside the third encapsulation part. One end of the third encapsulation part in the length direction is connected to the first encapsulation part, and the other end of the third encapsulation part in the length direction forms a fourth opening, which communicates with the third accommodating cavity. Wherein, the first direction is the thickness direction of the first package portion, the second direction is the length direction of the first package portion, and the third direction is the width direction of the first package portion.

2. The cell housing according to claim 1, characterized in that, The first encapsulation part includes two first panels and two first side panels. The two first panels are opposite each other along a first direction, and the two first side panels are opposite each other along a third direction. One of the first side panels is provided with a first interface and a second interface. The second encapsulation part includes two second panels, a second side plate, and a third side plate. The two second panels are opposite each other along a first direction, and the second side plate and the third side plate are opposite each other along the width direction of the second encapsulation part. The third side plate is located on the side closer to the third encapsulation part. The third side plate includes a first straight section and a first inclined section. The first straight section is perpendicular to the first side plate, and the first inclined section is parallel to the second side plate. The ends of the two second panels near the first encapsulation part, and the ends of the second side plate and the first straight section near the first encapsulation part form a third interface. The third interface is welded to the first interface after being assembled. The third encapsulation part includes two third panels, a fourth side plate, and a fifth side plate. The two third panels are opposite each other along a first direction, and the fourth and fifth side plates are opposite each other along the width direction of the third encapsulation part. The fifth side plate is located on the side closer to the second encapsulation part. The fifth side plate includes a second straight section and a second inclined section. The second straight section is perpendicular to the first side plate, and the second inclined section is parallel to the fourth side plate. The ends of the two third panels near the first encapsulation part, and the ends of the fourth side plate and the second straight section near the first encapsulation part form a fourth interface. The fourth interface is assembled with the second interface and then welded together. Wherein, the angle between the first inclined segment and the second inclined segment is N2; The range of N2 is: 70°≤N2≤120°.

3. The cell housing according to claim 2, characterized in that, The length of the first interface and the second interface along the second direction is F, and the width of the first encapsulation part along the third direction is A; The relationship between F and A satisfies: 8mm≤FA≤40mm.

4. The cell housing according to claim 3, characterized in that, Along the second direction, the distance between the first straight segment and the second straight segment is K; The relationship between K and A satisfies: 0.75≤K / A≤6.

5. The cell housing according to claim 2, characterized in that, The width of the first panel along a third direction, the width of the second panel along a direction perpendicular to its extension, and the width of the third panel along a direction perpendicular to its extension are equal; each of the first panels has a first extending flange at both ends along a second direction; each of the second panels has a second extending flange on the side of its length away from the first encapsulation portion; each of the third panels has a third extending flange on the side of its length away from the first encapsulation portion; the first extending flange, the second extending flange, and the third extending flange have the same shape and size design; Wherein, along the second direction, the length of the first extending flange is H; The value range of H is: 10mm≤H≤80mm.

6. The cell housing according to claim 5, characterized in that, The first extending flange includes a top edge and a inclined edge. The top edge is parallel to a first side edge along the length of the first panel, and the inclined edge is set at an angle to the top edge. The angle between the top edge and the inclined edge is N1. The range of N1 is: 105°≤N1≤150°.

7. The cell housing according to claim 6, characterized in that, Along a third direction, the width of the top edge is L, and the width of the first encapsulation portion is A; The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.

65.

8. The cell housing according to claim 5, characterized in that, Two explosion-proof valves are provided on a first side plate in the first encapsulation part along a third direction away from the second encapsulation part and the third encapsulation part, and the two explosion-proof valves are spaced apart along the second direction. Along the second direction, the distance between the centers of the two explosion-proof valves is W, and the distance between the two first extended flanges on opposite sides is E1; The relationship between W and E1 satisfies: 0.45≤W / E1≤0.

7.

9. The cell housing according to claim 8, characterized in that, The second and third packaging portions are designed symmetrically about the central axis of the first packaging portion along a third direction; Along the extending direction of the second encapsulation portion, the length of the first inclined segment is E2; The relationship between E1 and E2 satisfies: 0.25≤E2 / E1≤0.

6.

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

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