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 two housing parts, each housing part including a first encapsulation part and two second encapsulation parts. The two second encapsulation parts are symmetrically arranged about the first encapsulation part, and are arranged at an angle to the first encapsulation part. The two opposing second encapsulation parts in the two housing parts are inclined in a direction away from each other. Each of the two housing parts has a splicing interface on its side closest to each other, and the two splicing interfaces are welded together. The two housing parts together form a battery cell housing with a specific shape structure. Therefore, irregular installation space in the car floor or other electrical devices can be rationally utilized, while avoiding other components in the car floor or other electrical devices, resulting in high space utilization. This invention also provides a battery cell, including the above-described 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 two housing parts symmetrically designed about a central axis extending along a first direction; the first direction is the length direction of the battery cell housing; Each of the housing components includes a first encapsulation portion and two second encapsulation portions. The two second encapsulation portions are symmetrically arranged about the central axis of the first encapsulation portion extending along a second direction. The central axis of the two second encapsulation portions extending along their length direction forms an angle with the central axis of the first encapsulation portion extending along the second direction. The two second encapsulation portions in the two housing components that are opposite each other along the second direction are inclined in a direction away from each other. The second direction is the width direction of the battery cell housing. The second encapsulation part has an opening at its end away from the first encapsulation part along its length direction, and the opening is used to cooperate with the cell cover plate; the length direction of the second encapsulation part is the extension direction of the second encapsulation part; both of the two housing parts have splicing interfaces on their sides that are close to each other along the second direction, and the splicing interfaces of the two housing parts are welded together after being spliced ​​together.

[0006] Optionally, the battery cell housing further includes two top plates; one of the two housing sections is provided with an installation port on a side that is opposite to each other along the second direction, the top plate is installed at the installation port, and the four sides of the top plate are welded to the inner wall of the installation port.

[0007] Optionally, the first encapsulation portion includes two first panels facing each other along a third direction and two first side plates facing each other along a first direction. The two first panels are parallel, the two first side plates are parallel, and the two first panels and the two first side plates form the splicing interface along a second direction near one side of the other housing segment. The third direction is the thickness direction of the cell housing. Each second package includes two second panels facing each other along a third direction, and a second side plate and a third side plate facing each other along the width direction of the second package. The two second panels are parallel, and the second side plate is parallel to the third side plate. The third side plate is located on the side closer to the other housing segment and connected to one of the first side plates, while the second side plate is located on the side away from the other housing segment. Along the length direction of the second package, the length of the second side plate is less than the length of the third side plate. The two first panels on the side away from the other housing segment along a second direction and the two second side plates on the side closer to each other along a first direction form the mounting opening. The width direction of the second package is perpendicular to the extension direction of the second package. Along the first direction, the length of the mounting port is W2, the length of the splicing interface is W1, and the total length of the cell housing along the first direction is E1; The relationship between W1 and W2 satisfies: 6mm≤W2-W1≤16mm; The relationship between W2 and E1 satisfies: 0.2≤W2 / E1≤0.45.

[0008] Optionally, along the second direction, the distance between the ends of the two first side plates that are opposite each other along the second direction in the two shell parts is K, and the distance between the two top plates is E2; The relationship between K and E2 satisfies: 0.05 ≤ K / E2 ≤ 0.2; The value range of K is: 15mm≤K≤60mm.

[0009] Optionally, the included angle between the third side plates of the two second encapsulation portions that are opposite each other along the second direction in the two housing parts is N1; The range of N1 is: 30°≤N1≤90°.

[0010] Optionally, along the length of the second encapsulation portion, the end of the second panel away from the first encapsulation portion is provided with an extension flange, the length of which is H; The value range of H is: 15mm≤H≤70mm.

[0011] Optionally, each of the second panels has two extending flanges, which are located on opposite sides of the second panel along its width direction. Each extending flange includes a top edge and a beveled edge. The beveled edges of the two extending flanges are located on opposite sides. The top edge is parallel to the side of the second panel away from the first encapsulation portion along its length direction. The beveled edge and the top edge of the same extending flange are set at an angle. The angle between the beveled edges of two extending flanges opposite each other along the width direction of the second encapsulation portion is N2. The range of N2 is: 70°≤N2≤120°.

[0012] Optionally, along the width direction of the second encapsulation portion, the distance between the sides of the top edges of the two extended flanges that are close to each other is L, and the width of the second encapsulation portion is A; The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.75.

[0013] Optionally, the top plate includes a straight section and two inclined sections, the two inclined sections being located on both sides of the straight section along a first direction, and an explosion-proof valve is provided on the straight section; the two opposite sides of the straight section along a third direction are respectively connected to the side of the first panel away from the splicing interface along a second direction; the side of the inclined section away from the straight section along the second direction is connected to the second side plate of the second encapsulation part, and the two opposite sides of the inclined section along a third direction are respectively connected to the side of the second panel in the width direction; The wall thickness of the straight section along the second direction is T1, and the wall thickness of the second side plate along the width direction of the second encapsulation part is T2. The value range of T1 is: 0.35mm≤T1≤1mm; The value range of T2 is: 0.3mm≤T2≤0.8mm.

[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 comprising two housing sections. Each housing section includes a first encapsulation portion and two second encapsulation portions. The two second encapsulation portions are symmetrically arranged about the central axis extending from the first encapsulation portion along a second direction, and the central axes extending along the length of the two second encapsulation portions form an angle with the central axis extending from the first encapsulation portion along the second direction. A first accommodating cavity is formed within the first encapsulation portion, and a second accommodating cavity is formed within the second encapsulation portion. The first accommodating cavity and the second accommodating cavity are connected. The two second encapsulation portions, which are opposite each other along the second direction, are inclined in a direction away from each other. Each housing section has a splicing interface on its side that is close to each other along the second direction. The splicing interfaces of the two housing sections are joined together and welded together, and the first accommodating cavities of the two first encapsulation portions are connected through the splicing interfaces. The two housing sections together form a battery cell housing with a specific shape structure. Therefore, irregular installation spaces in automobile floorboards or other electrical devices can be rationally utilized, while avoiding interference risks with other components in the automobile floorboards or other electrical devices, resulting in high space utilization.

[0016] The present invention also provides a battery cell, including the aforementioned battery cell housing. This battery cell housing, through a special structural design, can be adapted for installation in irregular spaces within the chassis of a vehicle or other electrical devices, thereby improving space utilization. Furthermore, the internal assembly space for the battery cell electrode assembly 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 an exploded view of the battery cell casing 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; Figure 3 This is a front view of the battery cell housing provided in an embodiment of the present invention; Figure 4 yes Figure 3 Sectional view of section I-I; Figure 5 yes Figure 4 Enlarged view of a section at point II; Figure 6 This is a top view of the top plate provided in an embodiment of the present invention; Figure 7This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 8 yes Figure 7 Enlarged view of a section at point III; Figure 9 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 10 yes Figure 9 Enlarged view of a section at point IV; Figure 11 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. Casing assembly; 1101. Connecting interface; 1102. Mounting port; 111. First encapsulation part; 1111. First panel; 1112. First side panel; 112. Second encapsulation part; 1120. Opening; 1121. Second panel; 1122. Second side panel; 1123. Third side panel; 1124. Extending flange; 1124a. Top edge; 1124b. Bevel; 120. Top plate; 12 1. Straight section; 1211. Mounting hole; 122. Inclined section; 130. Explosion-proof valve; 200. Cell electrode assembly; 210. First split part; 220. Second split part; 221. First boss; 222. Second boss; 230. Electrode tab; 300. Cell cover plate; 310. Encapsulation cover; 311. Protective protrusion; 320. First plastic part; 330. Connector; 340. Second plastic part; 341. Mating protrusion; 350. Electrode post. 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 Figure 1 and Figure 2 ,as well as Figures 7-9 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 Figure 1 and Figure 2In this embodiment, the cell housing 100 is shaped like an "X". The cell housing 100 includes two housing sections 110 symmetrically designed about a central axis extending along a first direction. Each housing section 110 includes a first encapsulation portion 111 and two second encapsulation portions 112. The two second encapsulation portions 112 are symmetrically arranged about a central axis extending along a second direction from the first encapsulation portion 111. The central axes extending along the length of the two second encapsulation portions 112 form an angle with the central axis extending along the second direction from the first encapsulation portion 111. A first accommodating cavity is formed within the first encapsulation portion 111, and a second accommodating cavity is formed within the second encapsulation portion 112. The first accommodating cavity and the second accommodating cavity communicate with each other. The two second encapsulation portions 112, which are opposite each other along the second direction, are inclined in a direction away from each other. The first direction is the length direction of the cell housing 100, i.e. Figure 1 The X-axis direction is shown in the diagram; the second direction is the width direction of the cell casing 100, that is... Figure 1 The Y-axis direction is shown in the figure.

[0026] The second encapsulation part 112 has an opening 1120 at its end away from the first encapsulation part 111 along its length direction (i.e., the extension direction of the second encapsulation part 112). The opening 1120 is used to mate with the cell cover plate 300. There are four second encapsulation parts 112, that is, there are also four openings 1120. The two housing parts 110 are provided with splicing interfaces 1101 on their sides that are close to each other along the second direction. The splicing interfaces 1101 of the two housing parts 110 are welded together after being spliced ​​together, and the first accommodating cavities of the two first encapsulation parts 111 are connected through the splicing interfaces 1101. The two housing parts 110 together form a cell housing 100 with a specific shape and structure. Moreover, the housing parts 110 adopt a symmetrical design, which can share a cell cover plate 300 of uniform specifications, reduce the assembly process window, and improve assembly efficiency.

[0027] The cell housing 100 also includes two top plates 120. One of the two housing sections 110, located opposite each other along a second direction, has a mounting opening 1102. The top plates 120 are mounted at the mounting openings 1102, and their perimeter is welded to the inner wall of the mounting openings 1102. The mounting openings 1102 facilitate the installation of the cell electrode assembly 200 into the cell housing 100, reducing the risk of friction between the cell electrode assembly 200 and the cell housing 100 during assembly, resulting in a higher assembly yield.

[0028] The first encapsulation portion 111 includes two first panels 1111 facing each other along a third direction, and two first side panels 1112 facing each other along a first direction. The two first panels 1111 are parallel, and the two first side panels 1112 are parallel. The two first panels 1111 and the two first side panels 1112 form a splicing interface 1101 along a second direction near the side of the other housing segment 110. The aforementioned third direction is the thickness direction of the cell housing 100, that is... Figure 1 The Z-axis direction is shown in the figure.

[0029] Each second encapsulation portion 112 includes two second panels 1121 facing each other along a third direction, and a second side plate 1122 and a third side plate 1123 facing each other along the width direction of the second encapsulation portion 112, the width direction of the second encapsulation portion 112 being perpendicular to the extension direction of the second encapsulation portion 112. The two second panels 1121 are parallel, and the second side plate 1122 and the third side plate 1123 are parallel. The third side plate 1123 is located on the side closer to the other housing segment 110 and connected to a first side plate 1112, while the second side plate 1122 is located on the side away from the other housing segment 110. Along the length direction of the second encapsulation portion 112, the length of the second side plate 1122 is less than the length of the third side plate 1123. The two first panels 1111 on the side away from the other housing segment 110 along a second direction, and the two second side plates 1122 on the side closer to each other along a first direction, form a mounting opening 1102.

[0030] The first component 210 of the cell electrode assembly 200 can be inserted into the first receiving cavity of the two first encapsulation portions 111 along the second direction through the mounting port 1102. Each second component 220 of the cell electrode assembly 200 is inserted into the second receiving cavity of the corresponding second encapsulation portion 112 through the opening 1120 on the second encapsulation portion 112. The side of the second component 220 closest to the first component 210 is electrically connected to the first component 210.

[0031] See Figure 3 and Figure 4Along the first direction, the length of the mounting port 1102 is W2, and the length of the splicing interface 1101 is W1. The relationship between W1 and W2 satisfies: 6mm ≤ W2 - W1 ≤ 16mm. For example, the value of W2 - W1 can be 6mm, 8mm, 10mm, 12mm, 14mm, or 16mm, etc. By limiting the value of W2 - W1 to the above range, the length of the mounting port 1102 along the first direction is larger, making it easier for the first part 210 of the cell electrode assembly 200 to be installed into the first receiving cavity of the first encapsulation part 111, and less likely to interfere with the cell housing 100, reducing the risk of the cell electrode assembly 200 being scratched, and resulting in a high assembly yield. It should be noted that the length of the splicing interface 1101 along the first direction is greater than the maximum dimension of the first part 210 along the first direction, so that the first part 210 can be smoothly assembled with the first encapsulation part 111 of the cell housing 100.

[0032] Furthermore, along the first direction, the total length of the cell casing 100 along the first direction is E1, and the relationship between W2 and E1 satisfies: 0.2 ≤ W2 / E1 ≤ 0.45. For example, the value of W2 / E1 can be 0.2, 0.25, 0.3, 0.35, 0.4, or 0.45, etc. By limiting the value of W2 / E1 to the above range, the size of the first accommodating cavity within the first encapsulation part 111 is larger, which can accommodate a larger volume of the first split 210, resulting in a significant increase in cell capacity. If the value of W2 / E1 is too small, the size of the first encapsulation part 111 along the first direction is smaller, resulting in lower structural strength and a higher risk of deformation. Moreover, the volume of the first accommodating cavity is smaller, and the volume of the first split 210 that can be accommodated is smaller, which is not conducive to increasing the cell capacity. If the value of W2 / E1 is too large, the size of the first packaging part 111 along the first direction will be too large, and the size of the splicing interface 1101 will be large, which is not conducive to improving the structural strength of the shell split 110. Moreover, the processing difficulty of the shell split 110 will increase, and the cost will be higher.

[0033] See also Figure 4Along the second direction, the distance between the far ends of the two opposing first side plates 1112 in the two housing parts 110 along the second direction is K, and the value of K ranges from 15mm to 60mm. For example, the value of K can be 15mm, 20mm, 30mm, 40mm, 50mm, or 60mm. By limiting the value of K to the above range, it is convenient for the welding device to extend between the two adjacent second encapsulation parts 112 along the second direction to perform welding operations at the splicing interface 1101 of the two housing parts 110. If the value of K is too small, the distance between the two adjacent second encapsulation parts 112 along the second direction is small, the operating space is insufficient, it is difficult to complete the welding operation, and the welding yield decreases; if the value of K is too large, the length of the first encapsulation part 111 extending along the second direction is too large, the molding difficulty of the housing part 110 increases, and it will also have an adverse effect on the structural strength of the housing part 110, making it prone to deformation problems.

[0034] Furthermore, the distance between the two top plates 120 in the cell housing 100 is E2, and the relationship between K and E2 satisfies: 0.05 ≤ K / E2 ≤ 0.2. For example, the value of K / E2 can be 0.05, 0.1, 0.12, 0.14, 0.16, 0.18, or 0.2, etc. By limiting the value of K / E2 to the above range, a larger spacing between two adjacent second encapsulation parts 112 along the second direction is ensured, facilitating welding operations at the splicing interface 1101 of the two housing parts 110. The housing parts 110 are easy to stamp and form, resulting in high structural strength. Moreover, the volumes of the first and second accommodating cavities within the housing parts 110 are sufficiently large, the volume of the cell electrode assembly 200 is large, and the cell capacity is high.

[0035] See also Figure 4 The included angle between the third side plates 1123 of the two opposing second encapsulation portions 112 along the second direction in the two housing parts 110 is N1, and the value of N1 is in the range of 30°≤N1≤90°. For example, the value of N1 can be 30°, 36°, 40°, 50°, 60°, 70°, 80° or 90°, etc. By limiting the value of N1 to the above range, a large clearance space is formed between the two adjacent second encapsulation portions 112, which is convenient for adapting to irregular installation spaces in automobile chassis or other electrical devices. It also facilitates the welding operation after splicing the two housing parts 110, with a large operating space, a high welding yield, and high reliability after the battery cell housing 100 is assembled.

[0036] Along the length of the second encapsulation portion 112, each second panel 1121 has an extending flange 1124 at the end away from the first encapsulation portion 111. An extending space is formed between two opposing extending flanges 1124 along the third direction, and the extending space communicates with the second accommodating cavity. The cell electrode assembly 200 can also be arranged in the extending space. The arrangement of the extending flanges 1124 further increases the internal space of the cell housing 100, resulting in a significant increase in the volume of the cell electrode assembly 200 and a noticeable increase in cell capacity.

[0037] Optionally, the length of the extended flange 1124 along the length direction of the second packaging portion 112 is H, and the value of H is in the range of 15mm ≤ H ≤ 70mm. For example, the value of H can be 15mm, 20mm, 30mm, 40mm, 50mm, 60mm, or 70mm, 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 significantly and improving the cell capacity. If the value of H is too small, the volume of the internal space of the cell housing 100 increases only slightly, and the cell capacity improvement is not significant; if the value of H is too large, the extended length of the extended flange 1124 is too large, the structural strength decreases, deformation problems easily occur, and reliability is reduced.

[0038] Optionally, each second panel 1121 has two extension flanges 1124, which are located on both sides of the second panel 1121 along its width direction. Each extension flange 1124 includes a top edge 1124a and a chamfered edge 1124b. The chamfered edges 1124b of the two extension flanges 1124 are located on the side that is close to each other. The top edge 1124a is parallel to the side of the second panel 1121 away from the first encapsulation portion 111 along its length direction. The chamfered edge 1124b and the top edge 1124a of the same extension flange 1124 are arranged at an angle.

[0039] The included angle between the hypotenuses 1124b of the two opposing extended flanges 1124 along the width direction of the second encapsulation portion 112 is N2, and the value of N2 ranges from 70° to 120°. For example, the value of N2 can be 70°, 80°, 90°, 100°, 110°, or 120°. By limiting the value of N2 to the above range, the extended flanges 1124 are easy to form. When the cell housing 100 and the cell cover plate 300 are assembled, the extended flanges 1124 can play a good guiding role, enabling the second encapsulation portion 112 to be smoothly assembled with the cell cover plate 300, resulting in a high assembly yield. If the value of N2 is too small, the guiding effect of the extended flanges 1124 is poor, and the assembly yield is reduced; if the value of N2 is too large, the extension length of the extended flanges 1124 is short, which is not conducive to increasing the volume of the second accommodating cavity, resulting in a poor increase in the capacity of the cell.

[0040] Along the width direction of the second encapsulation portion 112, the distance between the sides of the top edges 1124a of the two extending flanges 1124 that are close to each other is L, and the width of the second encapsulation portion 112 is A. The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.75. For example, the value of L / A can be 0.40, 0.50, 0.55, 0.60, 0.65, 0.70, or 0.75, etc. By limiting the value of L / A to the above range, the top edge 1124a of the extending flange 1124 has a larger proportion in the width direction of the second encapsulation portion 1122, the extension space formed at the extending flange 1124 is larger, the volume of the internal space (i.e., the second accommodating cavity) of the second encapsulation portion 112 is effectively increased, and the extending flange 1124 is easy to assemble with the cell cover plate 300.

[0041] See also Figure 1 , Figure 3 and Figure 6 In this embodiment, the top plate 120 includes a straight section 121 and two inclined sections 122. The two inclined sections 122 are located on both sides of the straight section 121 along a first direction. The two opposite sides of the straight section 121 along a third direction are respectively connected to the side of a first panel 1111 away from the splicing interface 1101 along a second direction. The side of the inclined section 122 away from the straight section 121 along the second direction is connected to the second side plate 1122 of the second encapsulation part 112. The two opposite sides of the inclined section 122 along a third direction are respectively connected to the side of the second panel 1121 in the width direction. The straight section 121 is provided with a mounting hole 1211, and an explosion-proof valve 130 is provided in the mounting hole 1211. The explosion-proof valve 130 allows the gas inside the battery cell to be quickly discharged when thermal runaway occurs in the battery cell electrode group 200, ensuring high safety.

[0042] See also Figure 3 and Figure 5The straight section 121 and the inclined section 122 have equal wall thicknesses. For example, the wall thickness of the straight section 121 along the second direction is T1, and the value of T1 ranges from 0.35mm to 1mm. For example, the value of T1 can be 0.35mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, or 1.0mm, etc. The first panel 1111, the first side panel 1112, the second panel 1121, the second side panel 1122, and the third side panel 1123 of the housing body 110 have equal wall thicknesses. For example, the wall thickness of the second side panel 1122 along the width direction of the second encapsulation portion 112 is T2, and T1 ≥ T2. The value of T2 ranges from 0.3mm to 0.8mm. For example, the value of T2 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, or 0.8mm, etc. By limiting the values ​​of T1 and T2 within the above range, the mechanical strength of the top plate 120 and the shell assembly 110 is guaranteed to be high, which can provide good protection for the cell electrode assembly 200, making it less prone to deformation problems, and the cell shell 100 will not be too thick and heavy, resulting in a smaller total weight of the cell.

[0043] See also Figure 3 Along a third direction, the thickness of the first packaging portion 111 and the second packaging portion 112 is equal, both being B, and 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, etc. By limiting the value of B to the above range, the thickness of the first packaging portion 111 and the second packaging portion 112 is relatively large, the volume of the first accommodating cavity and the second accommodating cavity is relatively large, and the volume of the battery 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.

[0044] This embodiment also provides a battery cell, see [link to example]. Figures 7-10The 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 four openings 1120, each of which is connected to a battery cell cover plate 300. 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 efficient assembly. Furthermore, the battery cell housing 100 provides excellent positioning and protection for the battery cell electrode assembly 200, ensuring good battery cell safety.

[0045] See also Figure 9 and Figure 11 In this embodiment, the cell electrode assembly 200 includes a first segment 210 and four second segments 220. Each end of the first segment 210 along its length is connected to two second segments 220, and the two second segments 220 are inclined in a direction away from each other. Thus, the cell electrode assembly 200 also forms an "X"-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 segment 210 is first inserted into the first receiving cavity of the first encapsulation part 111 of the two housing segments 110, and the four second segments 220 are respectively inserted into the second receiving cavity of the second encapsulation part 112. Then, the first segment 210 and the four second segments 220 are made into contact electrical connection, so that the cell electrode assembly 200 can jointly supply power to the outside.

[0046] Optionally, the second segment 220 has an extension at its end facing away from the first segment 210 in the length direction. The extension increases the volume of the cell electrode assembly 200. At the same time, the extension engages with the extension flange 1124 in the housing segment 110. Part of the extension is located within the extension space, ensuring accurate positioning between the cell electrode assembly 200 and the cell housing 100, which helps improve the assembly yield.

[0047] Specifically, the extension includes two first protrusions 221 and a second protrusion 222. The first protrusions 221 match the shape of the extension flange 1124 and are accommodated in the corresponding extension space. The second protrusions 222 are used to mate with corresponding positions in the cell cover plate 300, ensuring accurate positioning between the cell electrode assembly 200 and the cell cover plate 300.

[0048] The first boss 221 includes a first end face, and the second boss 222 includes a second end face. Along the length of the second segment 220, the first end face of the first boss 221 is higher than the end face of the second segment 220 on the side away from the first segment 210 along its length, and the second end face of the second boss 222 is higher than the first end face of the first boss 221. The second boss 222 on the second segment 220 has tabs 230 on both opposite sides along a third direction, with both ends of each tab 230 extending to the inclined side of the first boss 221. The tabs 230 are used for electrical connection with the electrode post 350 on the cell cover plate 300. By extending the length of the tabs 230, the total current-carrying area of ​​the tabs 230 is increased, which can alleviate the heat generation at this location and avoid the risk of overheating.

[0049] See also Figure 8 and Figure 10 In this embodiment, the four cell cover plates 300 have the same structure. An example is given of one cell cover plate 300 that mates with the second encapsulation part 112. The cell cover plate 300 includes an encapsulation cover 310, a first plastic part 320, a connector 330, a second plastic part 340, and a terminal post 350. The second plastic part 340, encapsulation cover 310, first plastic part 320, and 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 post 350. The terminal post 350 passes through the second plastic part 340, encapsulation cover 310, first plastic part 320, and connector 330. One end of the terminal post 350 is connected to the electrode tab 230, and the other end is connected to the connector 330.

[0050] The shape of the encapsulation cover 310 matches the edge of the opening 1120 of the cell housing 100, and the four edges of the encapsulation cover 310 are welded to the edges of the opening 1120, thereby encapsulating the cell electrode assembly 200 within the cell housing 100. The encapsulation cover 310 also includes a protective protrusion 311, which is located at the middle position in the width direction of the encapsulation cover 310 (i.e., the width direction of the second encapsulation portion 112). The second plastic part 340 includes a mating protrusion 341, and the protective protrusion 311 and the mating protrusion 341 are stacked. The second boss 222 of the cell electrode assembly 200 is accommodated at the mating protrusion 341. Through the cooperation of the mating protrusion 341 and the second boss 222, precise positioning between the cell cover 300 and the cell electrode assembly 200 is achieved.

[0051] Each cell cover 300 has four terminal posts 350, with two terminal posts 350 forming a group of current-conducting terminals. These two groups of terminals are located on opposite sides of the width of the encapsulation cover 310. The two terminal posts 350 in each group are located on opposite sides of the protective protrusion 311 along a third direction. Along the height of the cell cover 300 (i.e., the length of the second encapsulation portion 112), the end faces of the terminal posts 350, connectors 330, and the first plastic part 320 facing away from the cell electrode group 200 are all lower than the protective protrusion 311. This provides good protection for the connectors 330 and terminal posts 350, preventing damage during manufacturing and improving the cell's safety and appearance. Furthermore, after the cells are grouped and welded to the busbar, the height of the busbar is also lower than the protective protrusion 311, 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 specific implementation cases to verify the relevant dimensional design of the above-mentioned cell housing 100. See Table 1 for details.

[0053] Table 1 As can be seen from the above results, the value ranges of parameters H, L / A, W2 / E1, W2-W1, K, K / E2, N1, T1, and T2 in Examples 1 to 6 meet their corresponding size limitations. The yield rate of the battery cell electrode assembly 200 and the battery cell housing 100 is high. The positioning of the battery cell electrode assembly 200 within the battery cell housing 100 is accurate. After assembly, neither the battery cell electrode assembly 200 nor the battery cell housing 100 is deformed or damaged. The volume of the battery cell electrode assembly 200 is significantly increased, and the battery cell capacity is large, meeting the need for high energy storage. The pressure relief rate is fast during battery cell thermal runaway, and the safety is high. The battery cell housing 100 product 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 ≤ 0.75. At this time, the top edge 1124a of the extended flange 1124 has an excessively large proportion in the width of the second encapsulation part 112, the spacing between the two extended flanges 1124 is too close, making it inconvenient to assemble with the cell cover 300, and the space at the protective protrusion 311 in the cell cover 300 is small, the volume of the second protrusion 222 of the cell electrode group 200 is small, the structural strength is low, and the cell housing 100 is defective.

[0055] In Comparative Example 2, the value of parameter L / A is greater than the maximum value of 0.4 ≤ L / A ≤ 0.75. At this time, the top edge 1124a of the extended flange 1124 has a small proportion in the width of the second package portion 112, resulting in poor structural strength. Moreover, it is not conducive to increasing the volume of the second accommodating cavity inside 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.

[0056] In Comparative Example 3, the value of parameter W2 / E1 is less than the minimum value of 0.2≤W2 / E1≤0.45. At this time, the size of the first encapsulation part 111 along the first direction is small, the structural strength is low, and it is easy to deform. The space for arranging the explosion-proof valve 130 on the top plate 120 is also small, which reduces the safety performance of the battery cell. Moreover, the volume of the first accommodating cavity is small, and the volume of the first split 210 that can be accommodated is small, which is not conducive to the improvement of the battery cell capacity. The battery cell casing 100 product is defective.

[0057] In Comparative Example 4, the value of parameter W2 / E1 is greater than the maximum value of 0.2≤W2 / E1≤0.45. At this time, the size of the first encapsulation part 111 along the first direction is too large, and the size of the mounting port 1102 is too large. This is not conducive to improving the structural strength of the shell split 110, and the processing difficulty of the shell split 110 increases, resulting in higher costs and defective battery cell shell 100 products.

[0058] In Comparative Example 5, the value of parameter K is less than the minimum value of 15mm ≤ K ≤ 60mm. At this time, the distance between two adjacent second packaging parts 112 along the second direction is small, the operating space is insufficient, it is difficult to complete the welding operation between the two housing parts 110, the welding yield decreases, and the cell housing 100 product is defective.

[0059] In Comparative Example 6, the value of parameter K is greater than the maximum value of 15mm≤K≤60mm. At this time, the length of the first packaging part 111 extending along the second direction is too large, which increases the difficulty of forming the shell part 110 and will have an adverse effect on the structural strength of the shell part 110, making it prone to deformation problems and resulting in defective battery cell shell 100 products.

[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, It includes two shell components symmetrically designed about a central axis extending along a first direction from the battery cell housing; the first direction is the length direction of the battery cell housing. Each of the housing components includes a first encapsulation portion and two second encapsulation portions. The two second encapsulation portions are symmetrically arranged about the central axis of the first encapsulation portion extending along a second direction. The central axis of the two second encapsulation portions extending along their length direction forms an angle with the central axis of the first encapsulation portion extending along the second direction. The two second encapsulation portions in the two housing components that are opposite each other along the second direction are inclined in a direction away from each other. The second direction is the width direction of the battery cell housing. The second encapsulation part has an opening at its end away from the first encapsulation part along its length direction, and the opening is used to cooperate with the cell cover plate; the length direction of the second encapsulation part is the extension direction of the second encapsulation part; both of the two housing parts have splicing interfaces on their sides that are close to each other along the second direction, and the splicing interfaces of the two housing parts are welded together after being spliced ​​together.

2. The cell housing according to claim 1, characterized in that, The battery cell housing also includes two top plates; one of the two housing sections is provided with an installation port on a side that is opposite to each other along the second direction, and the top plate is installed at the installation port, with the top plate welded to the inner wall of the installation port around its perimeter.

3. The cell housing according to claim 2, characterized in that, The first packaging portion includes two first panels facing each other along a third direction and two first side plates facing each other along a first direction. The two first panels are parallel, the two first side plates are parallel, and the two first panels and the two first side plates form the splicing interface along a second direction near the side of another housing segment. The third direction is the thickness direction of the cell housing. Each second package includes two second panels facing each other along a third direction, and a second side plate and a third side plate facing each other along the width direction of the second package. The two second panels are parallel, and the second side plate is parallel to the third side plate. The third side plate is located on the side closer to the other housing segment and connected to one of the first side plates, while the second side plate is located on the side away from the other housing segment. Along the length direction of the second package, the length of the second side plate is less than the length of the third side plate. The two first panels on the side away from the other housing segment along a second direction and the two second side plates on the side closer to each other along a first direction form the mounting opening. The width direction of the second package is perpendicular to the extension direction of the second package. Along the first direction, the length of the mounting port is W2, the length of the splicing interface is W1, and the total length of the cell housing along the first direction is E1; The relationship between W1 and W2 satisfies: 6mm≤W2-W1≤16mm; The relationship between W2 and E1 satisfies: 0.2≤W2 / E1≤0.

45.

4. The cell housing according to claim 3, characterized in that, Along the second direction, the distance between the ends of the two first side plates that are opposite each other along the second direction in the two shell parts is K, and the distance between the two top plates is E2; The relationship between K and E2 satisfies: 0.05 ≤ K / E2 ≤ 0.2; The value range of K is: 15mm≤K≤60mm.

5. The cell housing according to claim 3, characterized in that, The included angle between the third side plates of the two second encapsulation portions that are opposite each other along the second direction in the two housing parts is N1; The range of N1 is: 30°≤N1≤90°.

6. The cell housing according to claim 3, characterized in that, Along the length of the second encapsulation portion, the end of the second panel away from the first encapsulation portion is provided with an extension flange, the length of which is H; The value range of H is: 15mm≤H≤70mm.

7. The cell housing according to claim 6, characterized in that, Each of the second panels has two extension flanges, which are located on opposite sides of the second panel along its width direction. Each extension flange includes a top edge and a bevel. The bevels of the two extension flanges are located on the side closest to each other. The top edge is parallel to the side of the second panel away from the first encapsulation part along its length direction. The bevel and the top edge of the same extension flange are set at an angle. The angle between the bevels of the two opposite extension flanges along the width direction of the second encapsulation part is N2. The range of N2 is: 70°≤N2≤120°.

8. The cell housing according to claim 7, characterized in that, Along the width direction of the second encapsulation portion, the distance between the sides of the top edges of the two extended flanges that are close to each other is L, and the width of the second encapsulation portion is A; The relationship between L and A satisfies: 0.4 ≤ L / A ≤ 0.

75.

9. The cell housing according to claim 3, characterized in that, The top plate includes a straight section and two inclined sections, the two inclined sections being located on both sides of the straight section along a first direction, and an explosion-proof valve is provided on the straight section; the two opposite sides of the straight section along a third direction are respectively connected to the side of the first panel away from the splicing interface along a second direction; the side of the inclined section away from the straight section along the second direction is connected to the second side plate of the second encapsulation part, and the two opposite sides of the inclined section along a third direction are respectively connected to the side of the second panel in the width direction; The wall thickness of the straight section along the second direction is T1, and the wall thickness of the second side plate along the width direction of the second encapsulation part is T2. The value range of T1 is: 0.35mm≤T1≤1mm; The value range of T2 is: 0.3mm≤T2≤0.8mm.

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

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