An electrode group of an electric double layer capacitor and an electric double layer capacitor
By introducing cooling components and a separate structure into the cell electrode assembly, the problems of poor heat dissipation and low space utilization of the cell electrode assembly are solved, achieving good heat dissipation performance and high-rate fast charging effect, and improving the capacity and service life of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-04-22
- Publication Date
- 2026-07-14
AI Technical Summary
The existing battery cell electrode assembly has a planar end structure, which cannot be matched with the specially designed battery cell cover plate. This results in low space utilization and heat concentration in the center, leading to poor heat dissipation and affecting the high-rate fast charging performance of the battery cell.
Design a battery cell electrode assembly, including an electrode assembly body and a cooling component. The electrode assembly body is composed of a first split and a second split stacked together. The cooling component is attached to the split within a preset gap and has an internal cavity for the flow of cooling medium. The cooling component dissipates heat from the electrode assembly, and the increased cavity volume improves heat dissipation efficiency.
It achieves excellent heat dissipation performance of the cell electrode assembly, improves the lifespan of the cell and high-rate fast charging performance, and increases the cell capacity and space utilization.
Smart Images
Figure CN122393476A_ABST
Abstract
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 existing battery cell electrode assemblies are generally designed as planar structures, which cannot match the shape of some specially designed battery cell cover plates, resulting in low space utilization and reduced cell capacity and assembly ratio. Moreover, heat is concentrated in the center of the battery cell electrode assembly, leading to poor heat dissipation and affecting the high-rate fast charging performance of the battery cell. Summary of the Invention
[0004] The purpose of this invention is to provide a battery cell electrode assembly and a battery cell, wherein the central area of the battery cell electrode assembly has good heat dissipation, the entire battery cell electrode assembly has good temperature uniformity during charging and discharging, a long service life, and good performance.
[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 includes a first part and a second part extending along a first direction. The first part and the second part are stacked along the second direction and spaced apart by a preset gap. A cooling component is disposed within the preset gap. The two end faces of the cooling component, which are opposite each other along the second direction, are respectively attached to the first and second parts. The cooling component has a cavity for the flow of cooling medium. The cooling component is used to cool and reduce the temperature of the first and second parts of the battery cell electrode assembly.
[0006] Optionally, the preset gap includes a central area and two edge areas, the two edge areas being located on both sides of the central area along a third direction; the cooling component includes two solid plate parts and a hollow plate part, the two solid plate parts being distributed on both sides of the hollow plate part along a third direction, each solid plate part being located in one edge area of the preset gap, the hollow plate part being located in the central area, and the hollow plate part having a hollow interior forming the cavity; The first segment has a first groove on the end face near the second segment, and the first groove is located at the middle position of the first segment along a third direction. The second segment has a second groove on the end face near the first segment, and the second groove is located at the middle position of the second segment along a third direction. The first groove and the second groove form the central area, and the end faces of the first segment and the second segment that are close to each other form the edge area. Along the second direction, the height of the central region is L3, and the height of the edge region is E; The relationship between L3 and E satisfies: 3.2 ≤ L3 / E ≤ 4.5; The value of E is in the range of 1mm≤E≤3.5mm.
[0007] Optionally, along the second direction, a first protrusion is provided on the end face of the first split body facing away from the second split body, and a second protrusion is provided on the end face of the second split body facing away from the first split body. Along the second direction, the distance between the opposite ends of the first boss and the second boss is B, and the distance between the opposite ends of the first split body and the second split body is L1. The relationship between B and L1 satisfies: 16mm≤B-L1≤60mm.
[0008] Optionally, along the third direction, the widths of the first boss and the second boss are equal, both being W2, and the width of the pole group body along the third direction is A; The relationship between W2 and A satisfies: 0.33≤W2 / A≤0.7.
[0009] Optionally, the first split body is provided with a third protrusion at both ends along the first direction, and the second split body is provided with a fourth protrusion at both ends along the first direction. The third protrusion and the fourth protrusion located at the same end of the pole group body are facing each other and spaced apart along the second direction. Along the third direction, the widths of the third boss and the fourth boss are equal, both being W1; The relationship between W1 and A satisfies: 0.6 ≤ W1 / A ≤ 0.85.
[0010] Optionally, along the second direction, the distance between the opposite end faces of the third boss and the fourth boss is L2; The relationship between L1 and L2 satisfies: 10mm≤L1-L2≤24mm.
[0011] Optionally, along the first direction, the lengths of the third boss and the fourth boss are equal, both being H; The value range of H is: 10mm≤H≤40mm; Along the first direction, the distance between the end faces of the two third protrusions located at both ends of the first split body that are opposite to each other is M; The value range of M is: 300mm≤M≤1200mm.
[0012] Optionally, the cooling component includes a first bracket and a second bracket. The first bracket and the second bracket are located at the ends of the solid plate portion along a first direction, and the first bracket and the second bracket are respectively disposed on both sides of the hollow plate portion along a third direction. A liquid inlet channel is formed in the first bracket, and a liquid outlet channel is formed in the second bracket. Both the liquid inlet channel and the liquid outlet channel are in communication with the cavity. The first bracket has a liquid inlet on the side away from the hollow plate portion along a third direction, and the second bracket has a liquid outlet on the side away from the hollow plate portion along a third direction. The first split body is provided with a clearance step at the position corresponding to the first bracket and the second bracket, and the height of the clearance step is K along the second direction; The value range of K is: 4.5mm≤K≤11.2mm.
[0013] Optionally, each of the four corners of the first component is provided with a first guide surface, and each of the four corners of the second component is provided with a second guide surface. The included angle between two first guide surfaces that are opposite each other in the third direction in the first component and the included angle between two second guide surfaces that are opposite each other in the third direction in the second component are equal, both being N. The range of N is: 50°≤N≤120°.
[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, including an electrode assembly body and a cooling component. The electrode assembly body includes a first segment and a second segment extending along a first direction. The first segment and the second segment are stacked along a second direction and spaced apart by a preset gap. The cooling component is disposed within the preset gap. The two opposite end faces of the cooling component along the second direction are respectively attached to the first segment and the second segment. The cooling component has a cavity for the flow of a cooling medium. The cooling component can cool and reduce the temperature of the side of the first segment and the second segment of the battery cell electrode assembly that are close to each other. The heat dissipation and cooling effect in the central area of the battery cell electrode assembly is good, the service life is long, and the high-rate fast charging performance is good.
[0016] The present invention also provides a battery cell, including the aforementioned battery cell electrode assembly. A cooling component can cool and lower the central region of the electrode assembly body, resulting in good heat dissipation performance of the battery cell electrode assembly and good battery cell performance. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the structure of the pole group body provided in the embodiment of the present invention; Figure 2 This is a top view of the pole group body provided in an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view of section I-I; Figure 4 yes Figure 2 Sectional view of section II-II; Figure 5 yes Figure 4 Enlarged view of a section at point III; Figure 6 This is a schematic diagram of the structure of the first split provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of the structure of the second component provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the structure of the cooling component provided in the embodiment of the present invention; Figure 9 This is a top view of the electrode assembly and cooling components provided in this embodiment of the invention after assembly; Figure 10 yes Figure 9 A sectional view of section IV-IV; Figure 11 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 12 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 13 yes Figure 12 A magnified view of section V; Figure 14 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention.
[0018] In the picture: 100. Electrode assembly body; 110. First sub-assembly; 111. First boss; 112. Third boss; 113. First recess; 114. First guide surface; 115. Clearance step; 120. Second sub-assembly; 121. Second boss; 122. Fourth boss; 123. Second recess; 124. Second guide surface; 130. Preset gap; 131. Central area; 132. Edge area; 140. Electrode lug; 200. Cooling component; 210. Solid plate body; 220. Hollow plate body; 221. Cavity; 230. First 231, Inlet; 240, Second bracket; 241, Outlet; 300, Cell housing; 301, Opening; 310, First end plate; 311, Mounting part; 3111, First support bar; 3112, Second support bar; 3113, Slot; 312, Through hole; 320, Second end plate; 321, Mating protrusion; 322, Flange; 3221, Inclined part; 400, Cell cover plate; 410, Cover plate body; 411, Protective protrusion; 420, First insulating component; 430, Connector; 440, Terminal post. Detailed Implementation
[0019] 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.
[0020] 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.
[0021] 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.
[0022] 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.
[0023] like Figure 1 ,as well as Figures 9-12 As shown, this embodiment provides a cell electrode assembly, which, when assembled with the cell housing 300 and the cell cover plate 400, forms a cell. Through a special structural design, the heat dissipation efficiency of the cell electrode assembly can be improved. The central area of the cell electrode assembly exhibits good heat dissipation and temperature uniformity. Simultaneously, the relatively large volume of the cell electrode assembly is beneficial for increasing the energy density of the cell, resulting in a high assembly ratio.
[0024] Specifically, see Figure 1 ,as well as Figures 8-10 The battery cell electrode assembly includes an electrode assembly body 100 and a cooling element 200. The electrode assembly body 100 includes a first segment 110 and a second segment 120 extending along a first direction. The first segment 110 and the second segment 120 are stacked along the second direction and spaced apart by a preset gap 130. The cooling element 200 is disposed within the preset gap 130. The two opposite end faces of the cooling element 200 along the second direction are respectively attached to the first segment 110 and the second segment 120. The cooling element 200 has a cavity 221 for the flow of cooling medium. The cooling element 200 can cool and reduce the temperature of the side of the first segment 110 and the second segment 120 of the battery cell electrode assembly that are close to each other. The heat dissipation effect in the central area of the battery cell electrode assembly is good, the temperature uniformity is good, and the performance is excellent during high-rate fast charging. The aforementioned first direction is... Figure 1 The X-axis direction shown is the second direction. Figure 1 The Y-axis direction is shown in the figure.
[0025] See Figure 2 , Figure 3 and Figure 10The predetermined gap 130 formed between the first segment 110 and the second segment 120 includes a central region 131 and two edge regions 132, with the two edge regions 132 located on both sides of the central region 131 along a third direction. The cooling element 200 includes two solid plate portions 210 and a hollow plate portion 220. The two solid plate portions 210 are distributed on both sides of the hollow plate portion 220 along a third direction. Each solid plate portion 210 is located on one edge region 132 of the predetermined gap 130, and the hollow plate portion 220 is located in the central region 131. The hollow plate portion 220 has a hollow cavity 221 inside. A cooling medium flows through the cavity 221. Exemplarily, the cooling medium can be a cooling gas, such as air or nitrogen. In some embodiments, the cooling medium can also be a coolant, such as water or an ethanol solution. By exchanging heat with the first segment 110 and the second segment 120 through the cooling medium, rapid cooling of the battery cell electrode assembly is achieved.
[0026] See Figure 3 , Figure 6 and Figure 7 A first recessed groove 113 is provided on the end face of the first component 110 near the second component 120, and the first recessed groove 113 is located at the middle position of the first component 110 along a third direction. A second recessed groove 123 is provided on the end face of the second component 120 near the first component 110, and the second recessed groove 123 is located at the middle position of the second component 120 along a third direction. A central region 131 is formed between the first recessed groove 113 and the second recessed groove 123, and an edge region 132 is formed between the end faces of the first component 110 and the second component 120 that are close to each other. Through the arrangement of the first recessed groove 113 and the second recessed groove 123, the hollow plate portion 220 of the cooling component 200 can be avoided, so that a larger cavity 221 can be formed inside the hollow plate portion 220, increasing the flow of the cooling medium, thereby enabling rapid heat exchange with the first component 110 and the second component 120 of the battery cell electrode assembly, and achieving rapid cooling. Meanwhile, the first sink 113 and the second sink 123, in conjunction with the hollow plate body 220, can also position the cooling component 200. After the electrode assembly body 100 and the cooling component 200 are assembled, the position of the cooling component 200 along the third direction is fixed and will not shift, resulting in a good fixing effect.
[0027] Optionally, the edge region 132 mates with the solid plate portion 210 of the cooling component 200, and the two opposite end faces of the solid plate portion 210 along the second direction are respectively attached to the first component 110 and the second component 120. The height of the edge region 132 is E, that is, the thickness of the solid plate portion 210 is E. The value of E is in the range of 1mm ≤ E ≤ 3.5mm. For example, the value of E can be 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, or 3.5mm, etc. By limiting the value of E within the above range, it is ensured that the cooling component 200 itself has high mechanical strength and is not prone to deformation problems, while not occupying too much space, which is conducive to increasing the arrangement space of the electrode assembly body 100 and helps to increase the capacity of the battery cell. Optionally, in some embodiments, the thickness of the solid plate portion 210 along the first direction is equal to the wall thickness of the hollow plate portion 220. The wall thickness of the hollow plate portion 220 is also E.
[0028] Furthermore, along the second direction, the height of the central region 131 is L3, and the relationship between L3 and E satisfies: 3.2 ≤ L3 / E ≤ 4.5. For example, the value of L3 / E can be 3.2, 3.5, 3.8, 4.0, 4.2, or 4.5, etc. By limiting the value of L3 / E to the above range, the arrangement space of the hollow plate body 220 is larger, and the volume of the cavity 221 inside the hollow plate body 220 is large enough to meet the requirements of rapid flow of cooling medium, resulting in good cooling effect. The value of L3 can be calculated based on the values of E and L3 / E.
[0029] See also Figures 8-10 In this embodiment, the cooling component 200 further includes a first support 230 and a second support 240. The first support 230 and the second support 240 are located at the ends of the solid plate portion 210 along a first direction, and the first support 230 and the second support 240 are respectively disposed on both sides of the hollow plate portion 220 along a third direction. A liquid inlet channel is formed in the first support 230, and a liquid outlet channel is formed in the second support 240. Both the liquid inlet channel and the liquid outlet channel are connected to the cavity 221. The first support 230 has a liquid inlet 231 connected to the liquid inlet channel on the side of the first support 230 away from the hollow plate portion 220 along a third direction, and the second support 240 has a liquid outlet 241 connected to the liquid outlet channel on the side of the second support 240 away from the hollow plate portion 220 along a third direction. The liquid inlet 231 and the liquid outlet 241 are connected to the circulation pipeline of the cooling medium. With the above configuration, the cooling medium can enter the central region of the electrode assembly body 100 from one side along the third direction, exchange heat with the first split body 110 and the second split body 120 through the hollow plate body 220, and then the cooling medium flows out from the other side of the electrode assembly body 100 along the third direction, thereby achieving rapid cooling of the electrode assembly body 100.
[0030] See Figures 4-7The first component 110 has a clearance step 115 at the positions corresponding to the first support 230 and the second support 240. The clearance step 115 provides space for the arrangement of the first support 230 and the second support 240 of the cooling component 200, and also limits the relative position of the cooling component 200 and the electrode assembly body 100 during assembly. Accurate positioning between the electrode assembly body 100 and the cooling component 200 improves assembly yield. Along the second direction, the height of the clearance step 115 is K, and the value of K ranges from 4.5mm to 11.2mm. For example, the value of K can be 4.5mm, 5.0mm, 6.0mm, 7.0mm, 8.0mm, 9.0mm, 10.0mm, 11.0mm, or 11.2mm, etc. By limiting the value of K within the above range, the arrangement space of the first support 230 and the second support 240 is sufficient, and the flow area of the liquid inlet channel formed in the first support 230 and the liquid outlet channel formed in the second support 240 is large, which is conducive to the rapid flow of cooling medium and thus the cooling efficiency of the electrode assembly body 100 is high.
[0031] See also Figure 2 and Figure 3 Along the second direction, a first protrusion 111 is provided on the end face of the first component 110 opposite to the second component 120, and a second protrusion 121 is provided on the end face of the second component 120 opposite to the first component 110. The arrangement of the first protrusion 111 and the second protrusion 121 increases the volume of the electrode assembly body 100, which is beneficial to increasing the capacity of the battery cell.
[0032] Optionally, the first component 110 and the second component 120 are symmetrically arranged about the cooling component 200. That is, along the second direction, the heights of the first component 110 and the second component 120 are equal, and the heights of the first boss 111 and the second boss 121 are also equal. Along the second direction, the distance between the opposing end faces of the first boss 111 and the second boss 121 is B, and the distance between the opposing end faces of the first component 110 and the second component 120 is L1. The relationship between B and L1 satisfies: 16mm ≤ B - L1 ≤ 60mm. For example, the value of B - L1 can be 16mm, 18mm, 20mm, 30mm, 40mm, 50mm, or 60mm, etc. The value of (B - L1) / 2 is the height of the first boss 111 and the second boss 121 along the second direction. By limiting the value of B-L1 within the aforementioned range, the dimensions of the first boss 111 protruding from the end face of the first sub-body 110 and the dimensions of the second boss 121 protruding from the end face of the second sub-body 120 will not be excessive. The cell housing 300 mating with this position is easy to process and form, and the volume of the electrode assembly body 100 is effectively increased, resulting in a significant increase in cell capacity. If the value of B-L1 is too small, the volume increase of the electrode assembly body 100 is minimal, and the increase in cell capacity is not significant. If the value of B-L1 is too large, the cell housing 300 mating with the first boss 111 and the second boss 121 is difficult to process and form, leading to a decrease in product yield. Furthermore, the structural strength of the formed cell housing 300 decreases, making it prone to deformation and reducing reliability.
[0033] Furthermore, along the third direction, the widths of the first protrusion 111 and the second protrusion 121 are equal, both being W2. The width of the electrode assembly body 100 along the third direction is A. The relationship between W2 and A satisfies: 0.33 ≤ W2 / A ≤ 0.7. For example, the value of W2 / A can be 0.33, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, or 0.7, etc. By limiting the value of W2 / A within the above range, the volume of the electrode assembly body 100 is effectively increased, resulting in a significant increase in volume and a noticeable increase in cell capacity. Otherwise, if the value of W2 / A is too small, the width proportions of the first protrusion 111 and the second protrusion 121 will be insufficient, leading to a limited increase in the volume of the electrode assembly body 100 and an insignificant increase in cell capacity. If the value of W2 / A is too large, it will increase the difficulty of molding the positions of the cell housing 300 and the cell cover plate 400 that mate with the first boss 111 and the second boss 121, and increase the cost.
[0034] See Figure 2 and Figure 4The first component 110 has a third protrusion 112 at each end along the first direction, and the second component 120 has a fourth protrusion 122 at each end along the first direction. The third protrusion 112 and the fourth protrusion 122 located at the same end of the electrode assembly body 100 are positioned opposite each other and spaced apart along the second direction. Optionally, along the third direction, the widths of the third protrusion 112 and the fourth protrusion 122 are equal, both being W1, and the relationship between W1 and A satisfies: 0.6 ≤ W1 / A ≤ 0.85. For example, the value of W1 / A can be 0.6, 0.65, 0.7, 0.75, 0.8, or 0.85, etc. By limiting the value of W1 / A to the above range, the volume of the electrode assembly body 100 is effectively increased, resulting in a significant increase in volume and a noticeable improvement in cell capacity. Otherwise, if the value of W1 / A is too small, the width of the third protrusion 112 and the fourth protrusion 122 will be insufficient, resulting in a limited increase in the volume of the electrode assembly body 100 and an insignificant increase in the capacity of the battery cell. If the value of W1 / A is too large, it will increase the difficulty of molding the positions in the battery cell cover plate 400 that mate with the third protrusion 112 and the fourth protrusion 122, thus increasing the cost.
[0035] See Figure 3 and Figure 5 In this embodiment, the height of the third protrusion 112 and the fourth protrusion 122 along the second direction is also the same. Along the second direction, the distance between the opposing end faces of the third protrusion 112 and the fourth protrusion 122 is L2, and the relationship between L1 and L2 satisfies: 10mm ≤ L1 - L2 ≤ 24mm. For example, the value of L1 - L2 can be 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, or 24mm, etc. By limiting the value of L1 - L2 to the above range, the volume of the electrode assembly body 100 is effectively increased, resulting in a significant increase in volume and a noticeable improvement in the battery cell's capacity. Otherwise, if the value of L1 - L2 is too small, the dimensions of the third protrusion 112 and the fourth protrusion 122 along the second direction will be small, the increase in the volume of the electrode assembly body 100 will be limited, and the improvement in the battery cell's capacity will be insignificant. If the values of L1-L2 are too large, the molding difficulty of the positions in the cell cover plate 400 that mate with the third boss 112 and the fourth boss 122 will increase, and the cost will rise.
[0036] Furthermore, along the first direction, the lengths of the third protrusion 112 and the fourth protrusion 122 are equal, both being H, and the value of H is in the range of 10mm ≤ H ≤ 40mm. For example, the value of H can be 10mm, 20mm, 30mm, 40mm, or 50mm, etc. By limiting the value of H to the above range, the dimensions of the third protrusion 112 and the fourth protrusion 122 along the first direction are larger, and the volume of the electrode assembly body 100 is significantly increased, ensuring a significant improvement in the capacity of the cell electrode assembly. At the same time, the third protrusion 112 and the fourth protrusion 122 do not protrude excessively from the opposite end faces of the first split body 110 and the second split body 120 along the first direction, making the forming difficulty of the mating position of the cell cover plate 400 with the third protrusion 112 and the fourth protrusion 122 easier to process and form.
[0037] See also Figure 2 Along the first direction, the distance between the end faces of the two third protrusions 112 located at both ends of the first segment 110 that are opposite to each other is M, and the value of M is in the range of 300mm ≤ M ≤ 1200mm. For example, the value of M can be 300mm, 500mm, 800mm, 1000mm, or 1200mm, etc. By limiting the value of M to the above range, the capacity of the cell electrode assembly is significantly improved.
[0038] Optionally, each of the four corners of the first component 110 is provided with a first guide surface 114, and each of the four corners of the second component 120 is provided with a second guide surface 124. The first and second guide surfaces 114 provide guidance when the battery cell assembly is inserted into the casing, facilitating assembly of the battery cell assembly with the battery cell casing 300, ensuring accurate orientation and good positioning during insertion. Furthermore, the included angle between the two opposing first guide surfaces 114 along a third direction in the first component 110 is equal to the included angle between the two opposing second guide surfaces 124 along a third direction in the second component 120, both being N. The value of N ranges from 50° to 120°. For example, the value of N can be 50°, 60°, 70°, 80°, 100°, 110°, or 120°. By limiting the value of N to the above range, the battery cell assembly has a good guiding effect during insertion into the casing, resulting in a high assembly yield.
[0039] This embodiment also provides a battery cell, see [link to example]. Figures 11-15The battery cell includes the aforementioned cell electrode assembly, cell cover plate 400, and cell housing 300. The cell housing 300 has two openings 301 at both ends along a first direction. Two cell cover plates 400 are provided, with each opening 301 welded to one cell cover plate 400. The cell electrode assembly is encapsulated by the two cell cover plates 400 and the cell housing 300. The cell electrode assembly is less prone to damage during housing insertion, has good heat dissipation performance, and achieves high space utilization within the cell housing 300, resulting in high capacity and efficient assembly.
[0040] Specifically, see [link to relevant documentation] Figures 12-14 In this embodiment, the battery cell housing 300 includes two first end plates 310 facing each other along a third direction, and two second end plates 320 facing each other along a second direction. The two first end plates 310 and the two second end plates 320 form a cylindrical structure, and an accommodating cavity is formed inside the cylindrical structure. The second end plate 320 is provided with a mating protrusion 321, and a first accommodating cavity is formed inside the mating protrusion 321. The first boss 111 of the first split 110 and the second boss 121 of the second split 120 are respectively disposed in the first accommodating cavity of the mating protrusion 321.
[0041] The inner wall of the first end plate 310 is provided with a mounting portion 311, and the cooling component 200 is connected to one mounting portion 311 on each of its two sides along a third direction. Specifically, the mounting portion 311 includes a first support bar 3111 and a second support bar 3112. The first support bar 3111 and the second support bar 3112 are spaced apart along a second direction, and a slot 3113 is formed between the first support bar 3111 and the second support bar 3112. The solid plate portions 210 of the cooling component 200 on both sides along the third direction are respectively inserted into one slot 3113. The slot 3113 provides good guidance when the cooling component 200 is assembled with the cell housing 300, allowing for smooth assembly. Furthermore, the first support bar 3111 and the second support bar 3112 also restrict the position of the cooling component 200, preventing it from swaying up and down along the second direction and moving left and right along the third direction, ensuring good positioning of the cooling component 200 within the cell housing 300.
[0042] When the cooling member 200 is installed in place along the slot 3113, the cooling member 200 is located in the accommodating cavity of the battery cell housing 300. The two end portions of the cooling member 200 along the third direction respectively abut against a first end plate 310. Thus, the cooling member 200 divides the accommodating cavity into two relatively independent chambers. The first split body 110 and the second split body 120 of the battery cell electrode group are respectively installed in one chamber. The cooling member 200 can provide effective support for the middle positions of the two first end plates 310 along the second direction, thereby protecting the battery cell electrode group from being easily crushed. At the same time, it plays a good role in limiting the battery cell electrode group, ensuring that the battery cell electrode group is not prone to shaking and displacement after being assembled with the battery cell housing 300. Further, through holes 312 are provided at the positions of the first end plate 310 corresponding to the liquid inlet 231 and the liquid outlet 241 of the cooling member 200. The through holes 312 can avoid the circulation pipeline of the cooling medium, facilitating the connection of the circulation pipeline with the liquid inlet 231 and the liquid outlet 241.
[0043] Flanges 322 are further provided at both ends of the battery cell housing 300 along the first direction. The two sides of the flanges 322 along the second direction are transitionally connected to the second end plate 320 through inclined portions 3221. The inclined portions 3221 are used to cooperate with the first guiding surface 114 and the second guiding surface 124 in the electrode group main body 100. Through the setting of the flanges 322, the volume of the accommodating cavity in the battery cell housing 300 is further increased, which is beneficial to increasing the capacity of the battery cell.
[0044] Continue to refer to Figure 15 , the battery cell cover plate 400 in this embodiment includes a cover plate body 410, a first insulating member 420, a second insulating member, a connecting member 430 and a pole 440. Among them, the second insulating member, the cover plate body 410, the first insulating member 420 and the connecting member 430 are laminated in sequence along the first direction. The first insulating member 420 insulates the connecting member 430 from the cover plate body 410, and the second insulating member insulates the cover plate body 410 from the battery cell electrode group. The cover plate body 410 is provided with a protective convex bump 411. The second insulating member, the cover plate body 410, the first insulating member 420 and the connecting member 430 are in a "return" shape. The protective convex bump 411 passes through the through holes in the middle parts of the second insulating member, the cover plate body 410, the first insulating member 420 and the connecting member 430. A accommodating space is formed inside the protective convex bump 411. The third convex platform 112 and the fourth convex platform 122 of the battery cell electrode group are installed in the accommodating space. Through the cooperation of the protective convex bump 411 with the third convex platform 112 and the fourth convex platform 122, precise positioning between the battery cell cover plate 400 and the battery cell electrode group is achieved. The circumferential edge of the cover plate body 410 is welded to the end of the battery cell housing 300 along the first direction, thereby encapsulating the battery cell electrode group in the accommodating cavity. [[ID=IO]]
[0045] Continue to refer to Figure 1 and Figure 15The first component 110 and the second component 120 each have tabs 140 on their two opposite end faces along the first direction, meaning there are a total of four tabs 140. The electrode group body 100 has two tabs at each end along the first direction. The tabs 140 are U-shaped and extend to the first guide surface 114 or the second guide surface 124, respectively. Four pole posts 440 are provided, arranged in two groups on both sides of the protective protrusion 411 along the second direction. Each pole post 440 is located at one corner of the cell cover plate 400. The pole post 440 passes through the second insulating member, the cover plate body 410, the first insulating member 420, and the connector 430. One end of each pole post 440 is connected to a corresponding tab 140, and the other end of each pole post 440 is connected to the connector 430. The connector 430 is used to connect to the busbar of the series / parallel cells. Since the terminal post 440 is located on the side of the protective protrusion 411, and the end faces of the terminal post 440 and the connector 430 on the side away from the cell electrode assembly along the first direction are both lower than the protective protrusion 411, it can provide good protection for the connector 430 and the terminal post 440, avoiding damage during the manufacturing process, improving the safety performance of the cell, and resulting in a good appearance of the cell. Moreover, after the cells are assembled and welded to the busbar, the height of the busbar is also lower than the protective protrusion 411, saving assembly space for the battery module, increasing the module assembly rate, and thus improving the performance indicators of the battery module.
[0046] 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.
[0047] Table 1 As can be seen from the above results, the value ranges of parameters H, L1-L2, B-L1, E, L3 / E, W1 / A, W2 / A, K, N, and M in Examples 1 to 6 meet their corresponding size limitations. The yield rate of the battery cell electrode assembly and the battery cell housing 300 is high. 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. The volume of the electrode assembly body 100 is significantly increased, and the battery cell capacity is large, meeting the need for high energy storage. Furthermore, the cooling component 200 has a significant cooling effect on the electrode assembly body 100. The operating temperature of the electrode assembly body 100 is suitable, and the high-rate fast charging performance is good. The battery cell electrode assembly product is of good quality.
[0048] In Comparative Example 1, the value of parameter B-L1 is less than the minimum value of 16mm≤B-L1≤60mm. At this time, the height of the first protrusion 111 and the second protrusion 121 along the second direction is small, the volume of the electrode group body 100 increases little, the capacity improvement effect of the cell is not obvious, and the cell electrode group product is defective.
[0049] In Comparative Example 2, the value of parameter B-L1 is greater than the maximum value of 16mm≤B-L1≤60mm. At this time, the height of the first boss 111 and the second boss 121 along the second direction is too large. The molding difficulty of the positions of the battery cell housing 300 and the battery cell cover plate 400 that mate with the first boss 111 and the second boss 121 increases, the cost increases, and the battery cell electrode assembly products are defective.
[0050] In Comparative Example 3, the value of parameter L3 / E is greater than the maximum value of 3.2 ≤ L3 / E ≤ 4.5. At this time, the height of the central area 131 in the preset gap 130 along the second direction is too large, which gives a large amount of space to the hollow plate body 220, occupies the space of the electrode group body 100, the volume increase of the electrode group body 100 is small, the capacity increase of the cell is reduced, and the cell electrode group product is defective.
[0051] In Comparative Example 4, the value of parameter L3 / E is less than the minimum value of 3.2 ≤ L3 / E ≤ 4.5. At this time, the height of the central area 131 in the preset gap 130 along the second direction is small, which provides less space for the arrangement of the hollow plate body 220. The hollow plate body 220 is thinner, making it difficult to process the cavity 221 inside. Moreover, the volume of the cavity 221 is also small, resulting in a small flow rate of the cooling medium. It cannot remove the heat from the electrode assembly body 100 in time, leading to poor cooling effect on the central area of the electrode assembly body 100, reduced heat dissipation performance, and defective cell electrode assembly products.
[0052] In Comparative Example 5, the value of parameter W2 / A is less than the minimum value of 0.33 ≤ W2 / A ≤ 0.7. At this time, the width of the first protrusion 111 and the second protrusion 121 along the third direction is small, the volume of the electrode group body 100 increases only slightly, the capacity improvement effect of the battery cell is not obvious, and the battery cell electrode group product is defective.
[0053] In Comparative Example 6, the value of parameter W2 / A is greater than the maximum value of 0.33≤W2 / A≤0.7. At this time, the width of the first boss 111 and the second boss 121 along the third direction is too large, which increases the molding difficulty of the positions of the battery cell housing 300 and the battery cell cover plate 400 that mate with the first boss 111 and the second boss 121, increases the cost, and results in defective battery cell electrode assembly products.
[0054] Taking all factors into consideration, when the dimensions of the battery cell electrode assembly meet the above requirements, a high yield rate for the assembly of the battery cell electrode assembly and the battery cell housing 300 can be guaranteed, and the positioning of the battery cell electrode assembly within the battery cell housing 300 is accurate. After assembly, neither the battery cell electrode assembly nor the battery cell housing 300 shows deformation or damage. The volume of the electrode assembly body 100 is significantly increased, the battery cell capacity is larger, meeting the needs of high energy storage, the operating temperature of the battery cell electrode assembly is suitable, and the high-rate fast charging performance is good.
[0055] 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 includes a first part and a second part extending along a first direction. The first part and the second part are stacked along the second direction and spaced apart by a preset gap. A cooling component is disposed within the preset gap. The two end faces of the cooling component, which are opposite each other along the second direction, are respectively attached to the first and second parts. The cooling component has a cavity for the flow of cooling medium. The cooling component is used to cool and reduce the temperature of the first and second parts of the battery cell electrode assembly.
2. The cell electrode assembly according to claim 1, characterized in that, The preset gap includes a central area and two edge areas, with the two edge areas located on both sides of the central area along a third direction; the cooling component includes two solid plate parts and a hollow plate part, with the two solid plate parts distributed on both sides of the hollow plate part along a third direction, each solid plate part located in one edge area of the preset gap, and the hollow plate part located in the central area, with the hollow plate part having a hollow interior forming the cavity; The first segment has a first groove on the end face near the second segment, and the first groove is located at the middle position of the first segment along a third direction. The second segment has a second groove on the end face near the first segment, and the second groove is located at the middle position of the second segment along a third direction. The first groove and the second groove form the central area, and the end faces of the first segment and the second segment that are close to each other form the edge area. Along the second direction, the height of the central region is L3, and the height of the edge region is E; The relationship between L3 and E satisfies: 3.2 ≤ L3 / E ≤ 4.5; The value of E is in the range of 1mm≤E≤3.5mm.
3. The cell electrode assembly according to claim 2, characterized in that, Along the second direction, a first protrusion is provided on the end face of the first split body facing away from the second split body, and a second protrusion is provided on the end face of the second split body facing away from the first split body. Along the second direction, the distance between the opposite ends of the first boss and the second boss is B, and the distance between the opposite ends of the first split body and the second split body is L1. The relationship between B and L1 satisfies: 16mm≤B-L1≤60mm.
4. The cell electrode assembly according to claim 3, characterized in that, Along the third direction, the widths of the first boss and the second boss are equal, both being W2, and the width of the pole group body along the third direction is A; The relationship between W2 and A satisfies: 0.33≤W2 / A≤0.
7.
5. The cell electrode assembly according to claim 4, characterized in that, The first split body is provided with a third protrusion at both ends along the first direction, and the second split body is provided with a fourth protrusion at both ends along the first direction. The third protrusion and the fourth protrusion located at the same end of the pole group body are facing each other and spaced apart along the second direction. Along the third direction, the widths of the third boss and the fourth boss are equal, both being W1; The relationship between W1 and A satisfies: 0.6 ≤ W1 / A ≤ 0.
85.
6. The cell electrode assembly according to claim 5, characterized in that, Along the second direction, the distance between the opposite end faces of the third boss and the fourth boss is L2; The relationship between L1 and L2 satisfies: 10mm≤L1-L2≤24mm.
7. The cell electrode assembly according to claim 5, characterized in that, Along the first direction, the lengths of the third boss and the fourth boss are equal, both being H; The value range of H is: 10mm≤H≤40mm; Along the first direction, the distance between the end faces of the two third protrusions located at both ends of the first split body that are opposite to each other is M; The value range of M is: 300mm≤M≤1200mm.
8. The cell electrode assembly according to claim 2, characterized in that, The cooling component includes a first bracket and a second bracket. The first bracket and the second bracket are located at the ends of the solid plate portion along a first direction, and the first bracket and the second bracket are respectively disposed on both sides of the hollow plate portion along a third direction. A liquid inlet channel is formed in the first bracket, and a liquid outlet channel is formed in the second bracket. Both the liquid inlet channel and the liquid outlet channel are in communication with the cavity. A liquid inlet is provided on the side of the first bracket away from the hollow plate portion along a third direction, and a liquid outlet is provided on the side of the second bracket away from the hollow plate portion along a third direction. The first split body is provided with a clearance step at the position corresponding to the first bracket and the second bracket, and the height of the clearance step is K along the second direction; The value range of K is: 4.5mm≤K≤11.2mm.
9. The cell electrode assembly according to claim 1, characterized in that, Each of the four corners of the first component is provided with a first guide surface, and each of the four corners of the second component is provided with a second guide surface. The included angle between two first guide surfaces that are opposite each other in the third direction in the first component and the included angle between two second guide surfaces that are opposite each other in the third direction in the second component are equal, both being N. The range of N is: 50°≤N≤120°.
10. A battery cell, characterized in that, Includes the cell electrode assembly according to any one of claims 1-9.