An electrode group of an electric double layer capacitor and an electric double layer capacitor

Abstract

The application belongs to the technical field of batteries, and specifically discloses a battery cell pole group and a battery cell. The battery cell pole group comprises a pole group main body, and the two first end faces of the pole group main body opposite along a first direction are each provided with a first boss. The two second end faces of the pole group main body opposite along a third direction are each provided with a second boss. Through the arrangement of the first boss and the second boss, the volume of the battery cell pole group is greatly increased, the assembly of the battery cell pole group in the battery cell shell is relatively high, and the capacity of the battery cell is improved. Moreover, the first boss can cooperate with a battery cell cover plate to realize accurate positioning between the battery cell pole group and the battery cell cover plate. The battery cell cover plate can apply uniform pressure to the battery cell pole group, so that the stress balance of the battery cell pole group when entering the shell is ensured, and the battery cell pole group is not prone to being crushed or being broken into pieces. The application further provides a battery cell comprising the above battery cell pole group.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a cell electrode assembly 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 performance 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 ends of the cell electrode assemblies in existing battery cells are typically designed with a planar structure. If the positioning of the cell electrode assemblies and the cell cover is inaccurate, an imbalance in the support surface can easily occur. When the cell cover pushes the cell electrode assemblies into the casing and fixes them, it can easily cause assembly defects such as electrode damage and excessive movement. Moreover, the planar design of the cell electrode assemblies results in relatively low space utilization within the casing, which is not conducive to improving the assembly ratio and capacity of the battery cells. Summary of the Invention

[0004] The purpose of this invention is to provide a cell electrode assembly and a cell that can be accurately positioned and assembled with the cell cover plate. The two support surfaces are balanced, and the cell electrode assembly is not easily damaged by fragments when it is inserted into the casing. The assembly yield is high, and the increased volume of the cell electrode assembly is beneficial to improving the assembly ratio and capacity of the cell.

[0005] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a cell electrode assembly, comprising: The electrode assembly body has two first protrusions on its two opposite first end faces along a first direction, and each end face has two first protrusions. The two first protrusions located at the same end of the electrode assembly body are spaced apart along a second direction. The four first protrusions are symmetrically arranged on both sides of the electrode assembly body along the first direction. The electrode assembly body has a second protrusion on each of the two opposite second end faces along the third direction, and the two second protrusions are symmetrically arranged on both sides of the electrode assembly body along the third direction.

[0006] Optionally, along the first direction, the height of the first boss is H; The value range of H is: 20mm≤H≤50mm.

[0007] Optionally, along the first direction, the distance between the end faces of the two first protrusions located at both ends of the pole group body that are opposite to each other is E; The value of E is in the range of 250mm≤E≤1200mm.

[0008] Optionally, along the second direction, the distance between the two first protrusions located at the same end of the pole group body is L3, the distance between the end faces of the two first protrusions located at the same end of the pole group body that are opposite to each other is L2, and the distance between the two third end faces of the pole group body that are opposite each other along the second direction is A2. The relationship between L2, L3 and A2 satisfies: 0.33≤(L2-L3) / A2≤0.6.

[0009] Optionally, the electrode assembly body has a third protrusion on each of the two opposite third end faces along the second direction, and each third end face has two third protrusions. The two third protrusions on the same third end face are spaced apart along the third direction and form a through groove between the two third protrusions. The four third protrusions are symmetrically arranged on both sides of the electrode assembly body along the second direction.

[0010] Optionally, along the second direction, the width of the second protrusion is L1, and the distance between the end faces of the two third protrusions located at both ends of the pole group body on opposite sides is A1; The relationship between L1 and A1 satisfies: 0.4 ≤ L1 / A1 ≤ 0.7; The relationship between A1 and A2 satisfies: 16mm≤A1-A2≤70mm.

[0011] Optionally, along a third direction, the width of the first boss is W1, and the distance between the end faces of the two second bosses facing away from each other on one side is B1; The relationship between W1 and B1 satisfies: 0.3≤W1 / B1≤0.65.

[0012] Optionally, along the third direction, the width of the through groove is W2, and the distance between the two opposite second end faces of the pole group body along the third direction is B2; The relationship between W2 and B2 satisfies: 0.2 ≤ W2 / B2 ≤ 0.5; The relationship between B1 and B2 satisfies: 20mm≤B1-B2≤50mm.

[0013] Optionally, each end of the electrode assembly body opposite to each other along the first direction is provided with two first guide surfaces, and the two first guide surfaces located at the same end of the electrode assembly body are respectively disposed on both sides of the electrode assembly body along the second direction; the first guide surfaces are inclined relative to the first end face of the electrode assembly body opposite to each other along the first direction. The included angle between the two first guide surfaces located at the same end of the pole group body is N; The range of N is: 55°≤N≤110°.

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

[0015] The beneficial effects of this invention are as follows: This invention provides a battery cell electrode assembly, comprising an electrode assembly body. Each of the two opposite first end faces of the electrode assembly body along a first direction has a first protrusion, with two first protrusions at each end. Two first protrusions at the same end of the electrode assembly body are spaced apart along a second direction, and the four first protrusions are symmetrically arranged on both sides of the electrode assembly body along the first direction. Each of the two opposite second end faces of the electrode assembly body along a third direction has a second protrusion, and the two second protrusions are symmetrically arranged on both sides of the electrode assembly body along the third direction. The arrangement of the first and second protrusions significantly increases the volume of the battery cell electrode assembly, resulting in a higher assembly ratio within the battery cell housing, which is beneficial for increasing the battery cell's capacity. Furthermore, the positioning between the battery cell electrode assembly and the battery cell cover is accurate, and the battery cell cover can apply uniform pressure to the battery cell electrode assembly, ensuring force balance when the battery cell electrode assembly is inserted into the housing, reducing the risk of damage or fragmentation. Moreover, the entire cell electrode assembly adopts a symmetrical structure, which allows the two ends of the cell electrode assembly along the first direction to be assembled with cell cover plates of the same structure, reducing process windows on the assembly line and effectively improving process efficiency and process yield.

[0016] The present invention also provides a battery cell comprising the aforementioned battery cell electrode assembly. The battery cell electrode assembly achieves a high yield rate during assembly with the battery cell cover and battery cell housing. The battery cell electrode assembly is scratch-free during housing insertion and is accurately positioned after installation. Furthermore, the volume of the battery cell electrode assembly is significantly increased, resulting in a larger battery cell capacity. 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 creative effort.

[0018] Figure 1 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 2 This is a top view of the cell electrode assembly provided in an embodiment of the present invention; Figure 3 This is a left view of the cell electrode assembly provided in an embodiment of the present invention; Figure 4 This is a front view of the cell electrode assembly provided in an embodiment of the present invention; Figure 5 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 6This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention.

[0019] In the picture: Electrode assembly body; 110, first end face; 111, first boss; 1111, second guide surface; 120, second end face; 121, second boss; 130, third end face; 131, third boss; 1311, through groove; 140, first guide surface; 150, electrode tab; 200, cell cover plate; 210, cover plate body; 211, protective protrusion; 220, first insulating component; 230, connector; 240, electrode post; 300, cell housing; 310, cylinder body; 311, extension flange; 312, first protrusion; 313, second protrusion; 320, cooling channel; 321, coolant inlet; 322, coolant outlet. 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 , Figure 5 and Figure 6 As shown, this embodiment provides a cell electrode assembly that can be adapted to some irregularly shaped cell cover plates 200 and cell housings 300. Through a special structural design, the cell cover plates 200 and cell housings 300 can increase the assembly space of the cell electrode assembly, thereby improving the energy density of the cell and achieving a high assembly ratio. Furthermore, the positioning between the cell electrode assembly and the cell cover plate 200 is accurate, and the cell cover plate 200 can apply uniform pressure to the cell electrode assembly, ensuring force balance when the cell electrode assembly is inserted into the housing, reducing the risk of damage or fragmentation.

[0025] Specifically, see Figures 1-4 In this embodiment, the cell electrode assembly includes an electrode assembly body 100. Each of the two opposite first end faces 110 of the electrode assembly body 100 along a first direction has a first protrusion 111, with two first protrusions 111 at each end. Two first protrusions 111 at the same end of the electrode assembly body 100 are spaced apart along a second direction, and the four first protrusions 111 are symmetrically arranged on both sides of the electrode assembly body 100 along the first direction. Each of the two opposite second end faces 120 of the electrode assembly body 100 along a third direction has a second protrusion 121, which is symmetrically arranged on both sides of the electrode assembly body 100 along the third direction. The arrangement of the first protrusions 111 and the second protrusions 121 significantly increases the volume of the cell electrode assembly, resulting in a higher assembly ratio within the cell housing 300, which is beneficial for increasing the cell capacity. Moreover, the entire cell electrode assembly adopts a symmetrical structure, which allows the two ends of the cell electrode assembly along the first direction to be assembled with the cell cover plate 200 of the same structure, reducing the process window on the assembly line and effectively improving process efficiency and process yield.

[0026] See also Figure 2 and Figure 4In this embodiment, the height of the first protrusion 111 along the first direction is H, and the value of H is in the range of 20mm ≤ H ≤ 50mm. For example, the value of H can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm, etc. By limiting the value of H to the above range, the volume of the first protrusion 111 is larger, which can effectively increase the capacity of the battery cell. Of course, the value of H should not be too large, otherwise the height of the first protrusion 111 will be too large, the position in the battery cell cover 200 that matches the first protrusion 111 will be difficult to form, the processing yield will decrease, and when the first protrusion 111 is too high, it is more susceptible to impact, the structural strength will be weakened, and it will not be conducive to improving the protection of the battery cell electrode assembly.

[0027] Along the first direction, the distance between the end faces of the two first protrusions 111 located at both ends of the electrode assembly body 100, which are opposite to each other, is E. The value of E ranges from 250mm to 1200mm. For example, the value of E can be 250mm, 300mm, 350mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, or 1200mm, etc. By limiting the value of E to the above range, the volume of the cell electrode assembly is larger, and the capacity of the cell is higher.

[0028] See also Figure 2 and Figure 3Along the second direction, the distance between the two first protrusions 111 located at the same end of the electrode assembly body 100 is L3, the distance between the end faces of the two first protrusions 111 located at the same end of the electrode assembly body 100 that are opposite to each other is L2, and the distance between the two opposite third end faces 130 of the electrode assembly body 100 along the second direction is A2. The relationship between L2, L3 and A2 satisfies: 0.33≤(L2-L3) / A2≤0.6. For example, the value of (L2-L3) / A2 can be 0.33, 0.40, 0.45, 0.50, 0.55 or 0.60, etc. By limiting the value of (L2-L3) / A2 to the above range, a suitable installation space is left between two adjacent first protrusions 312, which is convenient for fitting with the cell cover plate 200. At the same time, the width of the first protrusion 111 along the second direction is large enough, which can significantly increase the volume of the cell electrode assembly and increase the cell capacity significantly. Optionally, the value range of L3 is: 20mm ≤ L3 ≤ 40mm. For example, the value of L3 can be 20mm, 25mm, 30mm, 35mm, or 40mm, etc. The value range of L2 is: 155mm ≤ L2 ≤ 320mm. For example, the value of L2 can be 155mm, 185mm, 200mm, 250mm, 300mm, or 320mm, etc. The value range of A2 is: 170mm ≤ A2 ≤ 340mm. For example, the value of A2 can be 170mm, 200mm, 250mm, 280mm, 320mm, or 340mm, etc.

[0029] Furthermore, the electrode assembly body 100 has two third protrusions 131 on each of its two opposite third end faces 130 along the second direction, and each third end face 130 has two third protrusions 131. The two third protrusions 131 on the same third end face 130 are spaced apart along the third direction, and a through groove 1311 is formed between the two third protrusions 131. The bottom wall of the through groove 1311 is the third end face 130. Optionally, the four third protrusions 131 are symmetrically arranged on both sides of the electrode assembly body 100 along the second direction. By setting the third protrusions 131, the volume of the cell electrode assembly can be further increased, and the capacity of the cell can be increased. At the same time, the third protrusions 131 can also cooperate with the corresponding second protrusions 313 in the cell housing 300 (see...). Figure 8 This improves the positioning effect of the cell electrode assembly within the cell casing 300, making it less prone to shaking or displacement, and reducing the risk of cell electrode assembly fragmentation.

[0030] Optionally, along the second direction, the width of the second protrusion 121 is L1, and the distance between the end faces of the two third protrusions 131 located at both ends of the electrode assembly body 100 on opposite sides is A1. The relationship between L1 and A1 satisfies: 0.4 ≤ L1 / A1 ≤ 0.7. For example, the value of L1 / A1 can be 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.7, etc. By limiting the value of L1 / A1 to the above range, the volume of the cell electrode assembly is effectively increased, the cell capacity is significantly improved, and the first protrusion 312 in the cell housing 300 that mates with the second protrusion 121 is easy to form (see...). Figure 8 It is easy to process. Optionally, the value range of A1 is: 150mm≤A1≤500mm. For example, the value of A1 can be 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm or 500mm, etc.

[0031] Furthermore, the relationship between A1 and A2 satisfies: 16mm ≤ A1 - A2 ≤ 70mm. For example, the value of A1 - A2 can be 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, or 70mm, etc. The value of (A1 - A2) / 2 is the height of the third protrusion 131 along the second direction. By limiting the value of A1 - A2 to the above range, the volume of the cell electrode assembly is significantly increased, and the structural strength of the cell electrode assembly is high, making it less susceptible to impact damage and ensuring high safety.

[0032] See also Figure 3 and Figure 4 Along a third direction, the width of the first boss 111 is W1, and the distance between the end faces of the two second bosses 121 facing away from each other is B1. The relationship between W1 and B1 satisfies: 0.3 ≤ W1 / B1 ≤ 0.65. For example, the value of W1 / B1 can be 0.30, 0.40, 0.50, 0.60, or 0.65, etc. By limiting the value of W1 / B1 to the above range, the width of the first boss 111 is larger, which allows for a larger increase in the volume of the cell electrode assembly, resulting in a significant increase in the cell capacity. Moreover, the first boss 111 has a high processing yield, high structural strength, and is not easily damaged.

[0033] Optionally, along the third direction, the width of the through groove 1311 is W2, and the distance between the two opposing second end faces 120 of the electrode assembly body 100 along the third direction is B2. The relationship between W2 and B2 satisfies: 0.2 ≤ W2 / B2 ≤ 0.5. For example, the value of W2 / B2 can be 0.2, 0.22, 0.25, 0.28, 0.3, 0.35, 0.4, 0.45, or 0.5, etc. By limiting the value of W2 / B2 to the above range, the contact area between the through groove 1311 and the cell housing 300 is larger, which is beneficial to improving the assembly accuracy between the two. At the same time, a cooling channel 320 is also provided at the position in the cell housing 300 that mates with the through groove 1311. When the width of the through groove 1311 is larger, the width of the cooling channel 320 is also relatively larger, which can provide good auxiliary heat dissipation for the side of the cell electrode assembly along the second direction. The operating temperature of the cell electrode assembly is suitable, and the performance of the cell is good.

[0034] Furthermore, the relationship between B1 and B2 satisfies: 20mm ≤ B1 - B2 ≤ 50mm. For example, the value of B1 - B2 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, or 50mm, etc. By limiting the value of B1 - B2 to the above range, the volume of the second protrusion 121 is large enough, the volume of the cell electrode assembly increases significantly, the capacity of the cell increases significantly, and the first protrusion 312 in the cell housing 300 that mates with the second protrusion 121 is easy to process and form, with a high forming yield, and the mechanical strength at the first protrusion 312 is high, providing good protection for the cell electrode assembly. If the value of B1 - B2 is too small, the volume of the second protrusion 121 of the cell electrode assembly is small, which is not conducive to increasing the capacity and assembly ratio of the cell; if the value of B1 - B2 is too large, the processing difficulty of the first protrusion 312 in the cell housing 300 that mates with the second protrusion 121 increases, the forming yield decreases, and the protective capability decreases. Optionally, the value of B1 can be in the range of 70mm ≤ B1 ≤ 150mm. For example, the value of B1 can be 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, or 150mm, etc. The value of B2 can be calculated based on the above range of B1-B2.

[0035] Continue to participate Figure 1 and Figure 2Each end of the electrode assembly body 100 along the first direction has two first guide surfaces 140. The two first guide surfaces 140 located at the same end of the electrode assembly body 100 are respectively located on both sides of the electrode assembly body 100 along the second direction. The first guide surfaces 140 are inclined relative to the first end faces 110 of the electrode assembly body 100 along the first direction. The included angle between the two first guide surfaces 140 located at the same end of the electrode assembly body 100 is N, and the value of N is in the range of 55°≤N≤110°. For example, the value of N can be 55°, 60°, 70°, 80°, 90°, 100°, or 110°. By limiting the value of N to the above range, the electrode assembly can be well guided when the cell cover plate 200 presses the electrode assembly into the casing, and uniform pressure can be applied to the electrode assembly to ensure the force balance of the electrode assembly. If the value of N is too small, the guiding effect on the cell electrode assembly will be insignificant, the assembly of the cell electrode assembly and the cell cover plate 200 will be inconvenient, and the force exerted by the cell cover plate 200 on the cell electrode assembly will be relatively concentrated, which may easily damage the cell electrode assembly. If the value of N is too large, the guiding effect on the cell electrode assembly will be insignificant, the assembly of the cell electrode assembly and the cell cover plate 200 will be inconvenient, and it will not be conducive to increasing the length of the cell electrode assembly along the first direction.

[0036] More preferably, a second guide surface 1111 is provided on the edge of the first boss 111 near the cell cover plate 200. The second guide surface 1111 can be a sloping plane or an arc-shaped surface. The provision of the second guide surface 1111 makes it easier for the first boss 111 to be assembled with the cell cover plate 200. For example, the second guide surface 1111 can be provided on the edges of the two first bosses 111 opposite each other along the second direction. Of course, in other embodiments, a second guide surface 1111 can also be provided on each edge of the first boss 111 near the cell cover plate 200.

[0037] See Figures 5-8 This embodiment also provides a battery cell, including the aforementioned battery cell electrode assembly, battery cell housing 300, and two battery cell cover plates 200. The battery cell housing 300 has two openings at both ends along a first direction, and each opening is connected to a battery cell cover plate 200. The battery cell electrode assembly is encapsulated by the two battery cell cover plates 200 and the battery cell housing 300. By adopting a specially designed battery cell housing 300, the battery cell electrode assembly is not easily damaged by pressure. The battery cell housing 300 provides good positioning and support for the battery cell electrode assembly, while increasing the arrangement space of the battery cell electrode assembly. The space utilization rate of the battery cell electrode assembly within the battery cell housing 300 is high, resulting in high battery cell capacity and assembly ratio.

[0038] See also Figure 7, in this embodiment, the cell cover plate 200 includes a cover plate body 210, a first insulating member 220, a second insulating member, a connecting member 230, and a pole column 240. Among them, the second insulating member, the cover plate body 210, the first insulating member 220, and the connecting member 230 are stacked in sequence along the first direction. The first insulating member 220 insulates the connecting member 230 from the cover plate body 210, and the second insulating member insulates the cover plate body 210 from the cell electrode group. Two protective protrusions 211 are provided on the cover plate body 210. The second insulating member, the cover plate body 210, the first insulating member 220, and the connecting member 230 are in the shape of a "day" character. The two protective protrusions 211 are arranged at intervals along the second direction and both pass through the through holes in the middle of the second insulating member, the cover plate body 210, the first insulating member 220, and the connecting member 230. A receiving space is formed inside the protective protrusion 211, and the first protrusion 111 of each cell electrode group is installed in one receiving space. Through the cooperation of the protective protrusion 211 and the first protrusion 111 (see Figure 6 ), precise positioning between the cell cover plate 200 and the cell electrode group is achieved. The circumferential edge of the cover plate body 210 is welded to the extending flange 311 at the end of the cylindrical body 310 of the cell housing Figure 8 Figure 8 ), thereby encapsulating the cell electrode group in the receiving cavity.

[0039] There are four pole columns 240, and the four pole columns 240 are divided into two groups and arranged on both sides of the protective protrusion

[0039]

[0039] 111 along the third direction. Each pole column 240 is located at a corner of the cell cover plate 200. The pole column 240 passes through the second insulating member, the cover plate body 210, the first insulating member 220, and the connecting member 230. One end of each pole column 240 is connected to a corresponding pole ear 150, and the other end of the pole column 240 is connected to the connecting member 230. The connecting member 230 is used to connect to the bus bar for series / parallel connection of cells. Since the pole column 240 is located on the side of the protective protrusion 211, and along the first direction, the end faces of the pole column 240 and the connecting member 230 on the side背离 the cell electrode group are both lower than the protective protrusion 211, it can provide good protection for the connecting member 230 and the pole column 240, avoid the situation of being bruised during the manufacturing process, improve the safety performance of the cell, and the appearance of the cell is good. Moreover, after the cells are grouped and welded to the bus bar, the height of the bus bar is also lower than the protective protrusion 211, saving the assembly space of the battery module, improving the module grouping rate, and further improving the performance index of the battery module.

[0040] Furthermore, two pole ears 150 are further provided at the end of the cell electrode group along the first direction. The two pole ears 150 are respectively arranged on both sides of the first protrusion 111 along the third direction, and both ends of the pole ear 150 along the second direction extend to the first guiding surface 140 of the cell electrode group. The pole ear 150 is used for electrically connecting to the pole column 240 on the cell cover plate 200.

[0041] Continue to refer to Figure 6 and Figure 8 In this embodiment, the battery cell housing 300 includes a cylindrical body 310. A cooling channel 320 is provided on the inner side of the end face of the cylindrical body 310 along the second direction. The cooling channel 320 extends in the same direction as the cylindrical body 310 (i.e., the first direction). The cooling channel 320 corresponds one-to-one with the through slots 1311 in the battery cell electrode assembly and they cooperate with each other. Each through slot 1311 is adapted to a cooling channel 320, thereby ensuring that the orientation of the battery cell electrode assembly is determined when it enters the housing. This prevents interference between the battery cell electrode assembly and the battery cell housing 300, avoids fragment damage during battery cell electrode assembly entry, and ensures accurate positioning and good fixation between the battery cell electrode assembly and the battery cell housing 300 after entry. Each end face of the cylindrical body 310 along the second direction is provided with a coolant inlet 321 and a coolant outlet 322. The coolant inlet 321 and coolant outlet 322 communicate with the corresponding cooling channel 320, and coolant flows within the cooling channel 320. With the above configuration, the coolant can enter the cooling channel 320 from the outside of the cell housing 300, and then exchange heat with the side of the electrode assembly body 100 along the second direction through the coolant, so as to achieve rapid cooling of the cell electrode assembly. The temperature of the cell electrode assembly is suitable when it is working, and the thermal management performance of the cell is good.

[0042] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned cell electrode assembly. See Table 1 for details.

[0043] Table 1 As can be seen from the above results, the range of values ​​for parameters H, E, L1 / A1, (L2-L3) / A1, A1-A2, W1 / B1, B1-B2, W2 / B2, and N in Examples 1 to 6 meets their corresponding size limitations. The yield rate of the battery cell electrode assembly and the battery cell housing 300 is high. The cooling channel 320 plays a limiting role for the battery cell electrode assembly. The battery cell electrode assembly is accurately positioned within the battery cell housing 300. After assembly, neither the battery cell electrode assembly nor the battery cell housing 300 is deformed or damaged. Moreover, the volume of the battery cell electrode assembly is significantly increased, and the battery cell capacity is large, meeting the need for high energy storage. The battery cell electrode assembly product is of good quality.

[0044] In Comparative Example 1, the value of parameter L1 / A1 is less than the minimum value of 0.4≤L1 / A1≤0.7. At this time, the width of the second protrusion 121 along the second direction is small, the volume increase of the cell electrode group is limited, the cell capacity increase is not obvious, and the cell electrode group product is defective.

[0045] In Comparative Example 2, the value of parameter L1 / A1 is greater than the maximum value of 0.4≤L1 / A1≤0.7. At this time, the width of the second boss 121 along the second direction is too large, which increases the processing difficulty of the first protrusion 312 at the part of the cell housing 300 that mates with the second boss 121, resulting in high cost and defective cell electrode assembly products.

[0046] In Comparative Example 3, the value of parameter (L2-L3) / A1 is less than the minimum value of 0.33≤(L2-L3) / A2≤0.6. At this time, the width of the first protrusion 111 along the second direction is too small, the volume increase of the cell electrode assembly is limited, the capacity increase of the cell is not obvious, and the cell electrode assembly product is defective.

[0047] In Comparative Example 4, the value of parameter (L2-L3) / A1 is greater than the maximum value of 0.33≤(L2-L3) / A2≤0.6. The excessive width of the first boss 111 along the second direction increases the processing difficulty of the protective protrusion 211 in the cell cover 200 that mates with the first boss 111, making it harder to form and increasing costs. Furthermore, it reduces the space for the connector 230 and the first insulating component 220 in the cell cover 200, decreasing the structural strength of the connector 230 and the first insulating component 220, resulting in defective cell electrode assembly products.

[0048] In Comparative Example 5, the value of parameter W2 / B2 is less than the minimum value of 0.2 ≤ W2 / B2 ≤ 0.5. At this time, the width of the through groove 1311 on the third end face 130 opposite to the cell electrode assembly along the second direction is insufficient, and the width of the cooling channel 320 in the cell housing 300 at the location where it mates with the through groove 1311 along the third direction is too small. The cooling effect on the side of the cell electrode assembly is poor, the temperature of the cell electrode assembly during operation is too high, the performance is reduced, and the size of the through groove 1311 and the cooling channel 320 is too small, making it difficult to process and form, reducing the yield rate, and resulting in defective cell electrode assembly products.

[0049] In Comparative Example 6, the value of parameter W2 / B2 is greater than the maximum value of 0.2 ≤ W2 / B2 ≤ 0.5. At this time, the width of the through groove 1311 on the third end face 130 opposite to the cell electrode assembly along the second direction is too large, occupying a large space. The volume of the third protrusion 131 on both sides of the through groove 1311 along the third direction is too small, and the increase in the volume of the cell electrode assembly is not significant, which is not conducive to improving the capacity of the cell. Moreover, the structural strength of the third protrusion 131 of the cell electrode assembly is weak and easily damaged, resulting in a defective cell electrode assembly product.

[0050] Taking all factors into consideration, when the dimensions of the cell electrode assembly meet the above requirements, a high yield rate for the assembly of the cell electrode assembly and the cell housing 300 can be guaranteed, and the positioning of the cell electrode assembly within the cell housing 300 is accurate. After assembly, neither the cell electrode assembly nor the cell housing 300 is deformed or damaged. The volume of the cell electrode assembly is significantly increased, and the cell capacity is larger, meeting the needs for high energy storage.

[0051] 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 cell electrode assembly, characterized in that, include: The electrode assembly body has two first protrusions on its two opposite first end faces along a first direction, and each end face has two first protrusions. The two first protrusions located at the same end of the electrode assembly body are spaced apart along a second direction. The four first protrusions are symmetrically arranged on both sides of the electrode assembly body along the first direction. The electrode assembly body has a second protrusion on each of the two opposite second end faces along the third direction, and the two second protrusions are symmetrically arranged on both sides of the electrode assembly body along the third direction.

2. The cell electrode assembly according to claim 1, characterized in that, Along the first direction, the height of the first boss is H; The value range of H is: 20mm≤H≤50mm.

3. The cell electrode assembly according to claim 1, characterized in that, Along the first direction, the distance between the end faces of the two first protrusions located at both ends of the pole group body that are opposite to each other is E; The value of E is in the range of 250mm≤E≤1200mm.

4. The cell electrode assembly according to claim 1, characterized in that, Along the second direction, the distance between the two first protrusions located at the same end of the pole group body is L3, the distance between the end faces of the two first protrusions located at the same end of the pole group body that are opposite to each other is L2, and the distance between the two third end faces of the pole group body that are opposite each other along the second direction is A2. The relationship between L2, L3 and A2 satisfies: 0.33≤(L2-L3) / A2≤0.

6.

5. The cell electrode assembly according to claim 4, characterized in that, The electrode assembly body has a third protrusion on each of the two opposite third end faces along the second direction, and each third end face has two third protrusions. The two third protrusions on the same third end face are spaced apart along the third direction and form a through groove between the two third protrusions. The four third protrusions are symmetrically arranged on both sides of the electrode assembly body along the second direction.

6. The cell electrode assembly according to claim 5, characterized in that, Along the second direction, the width of the second protrusion is L1, and the distance between the end faces of the two third protrusions located at both ends of the pole group body on opposite sides is A1; The relationship between L1 and A1 satisfies: 0.4 ≤ L1 / A1 ≤ 0.7; The relationship between A1 and A2 satisfies: 16mm≤A1-A2≤70mm.

7. The cell electrode assembly according to claim 5, characterized in that, Along the third direction, the width of the first boss is W1, and the distance between the end faces of the two second bosses that are opposite to each other is B1. The relationship between W1 and B1 satisfies: 0.3≤W1 / B1≤0.

65.

8. The cell electrode assembly according to claim 7, characterized in that, Along the third direction, the width of the through groove is W2, and the distance between the two opposite second end faces of the pole group body along the third direction is B2; The relationship between W2 and B2 satisfies: 0.2 ≤ W2 / B2 ≤ 0.5; The relationship between B1 and B2 satisfies: 20mm≤B1-B2≤50mm.

9. The cell electrode assembly according to claim 1, characterized in that, Each end of the electrode assembly body along the first direction is provided with two first guide surfaces. The two first guide surfaces located at the same end of the electrode assembly body are respectively disposed on both sides of the electrode assembly body along the second direction. The first guide surfaces are inclined relative to the first end faces of the electrode assembly body along the first direction. The included angle between the two first guide surfaces located at the same end of the pole group body is N; The range of N is: 55°≤N≤110°.

10. A battery cell, characterized in that, Includes the cell electrode assembly according to any one of claims 1-9.

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