A battery cell electrode assembly and a battery cell

Abstract

This invention belongs to the field of battery technology, specifically disclosing a cell electrode assembly and a cell. The cell electrode assembly includes two electrode components, each electrode component having a T-shaped extension on each of its two opposite end faces along a first direction. The extension increases the volume of the cell electrode assembly, thus improving the cell's capacity. Furthermore, the extension, in conjunction with the cell cover, improves the positioning accuracy between the cell cover and the cell electrode assembly. When the cell cover presses the cell electrode assembly into the casing, the cell electrode assembly is less likely to be scratched, resulting in a higher assembly yield. The cell electrode assembly also includes a venting support, which is sandwiched between the two electrode components and extends through them. The venting support allows electrolyte to flow from the ends of the electrode components along the first direction to the center of the electrode components, resulting in good wettability of the electrode components and good cell performance. This invention provides a cell including the aforementioned cell electrode assembly.

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. Furthermore, during the insertion of the battery cell electrode assembly into the casing, there may be an imbalance in the support surfaces between the electrode assembly and the cell cover plate. This imbalance can easily lead to electrode damage, excessive movement, and other assembly defects during the process of the cell cover plate pushing and fixing the electrode assembly into the casing. Additionally, although existing battery cell electrode assemblies can be immersed in electrolyte, they are typically formed by stacking electrode sheets. The electrode sheets near the center of the stack are not easily in contact with the electrolyte, which is detrimental to improving cell performance. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell electrode assembly and a battery cell. The battery cell electrode assembly and the battery cell cover plate have a balanced support surface. The battery cell electrode assembly is not easily damaged when it is installed in the casing. The battery cell electrode assembly has a high space utilization rate inside the battery cell. The battery cell has a high capacity and assembly ratio. In addition, the battery cell electrode assembly has good wettability and the battery cell has excellent 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, the cell electrode assembly comprising: The two polar components are divided into two parts. Each polar component has a T-shaped extension on its two opposite end faces along a first direction. The extension includes a first boss and a second boss. The first boss extends along a second direction, and the second boss is connected to the middle position of the first boss along the second direction. The second boss is located on the side of the first boss away from the other polar component along a third direction. The two polar components are symmetrically arranged along a third direction. The two opposite extensions along the third direction in the two polar components together form a cross-shaped expansion boss. An exhaust support is provided, which is sandwiched between the two polar component components along a third direction and penetrates the polar component components along a first direction. A flow channel is formed inside the exhaust support, and an inlet is provided at the end of the exhaust support along the first direction. An outlet is provided on the end face of the exhaust support facing the polar component along a third direction. Both the inlet and the outlet are connected to the flow channel.

[0006] Optionally, the first boss is a cuboid and the second boss is a frustum; the first boss and the second boss are connected by an arc-shaped surface. Wherein, the end face of the first protrusion facing the cell cover is the first end face, and the first end face is parallel to the first end face; the second protrusion includes a second end face, a first side face, a second side face and two third side faces, the second end face faces the cell cover and is parallel to the first end face, the first side face is located on the side close to the first protrusion along the third direction, the two ends of the first side face are respectively connected to the second end face and the first end face, the first side face is inclined relative to the second end face, the second end face is connected to the other side away from the first protrusion along the third direction, the second side face is parallel to the second end face of the electrode component along the third direction away from the other electrode component, the two third side faces are respectively connected to the opposite sides of the second end face, the first side face and the second side face along the second direction, and the third side faces are parallel to the third end faces of the electrode components along the second direction; Along the first direction, the height difference between the second end face and the first end face is H1, and the height difference between the first end face and the first end face is H2; The relationship between H1 and H2 satisfies: 10mm ≤ H1 - H2 ≤ 35mm; The value range of H1 is: 20mm≤H1≤70mm.

[0007] Optionally, the included angle between the first platform sides of the two second protrusions that are opposite each other along the third direction in the two polar components is N1; The range of N1 is: 80°≤N1≤140°.

[0008] Optionally, along the second direction, the width of the first boss is W1, and the width of the polar component is A1; The relationship between W1 and A1 satisfies: 0.7 ≤ W1 / A1 ≤ 0.9; Along the third direction, the thickness of the first boss is L1, and the thickness of the polar component is B2; The relationship between L1 and B2 satisfies: 0.3≤L1 / B2≤0.55.

[0009] Optionally, a third protrusion is provided on the second end face of the polar component, and the third protrusion extends in a third direction away from the other polar component; Along the second direction, the width of the second boss is W2, and the width of the third boss is A2; The relationship between W2 and A2 satisfies: 0.3 ≤ W2 / A2 ≤ 0.55; The relationship between A1 and A2 satisfies: 0.65≤A2 / A1≤0.85.

[0010] Optionally, the end faces of the polar component that are close to each other along the third direction are the fourth end faces, and the end face of the third boss that is away from the other polar component along the third direction is the fifth end face. Along the third direction, the distance between the fifth end face and the fourth end face is B1; The relationship between B1 and B2 satisfies: 6mm≤B1-B2≤30mm.

[0011] Optionally, the exhaust support is a hollow cylindrical thin-walled structure, with an inlet formed at each of the two ends along the first direction, and an outlet provided on each of the two end faces facing the two polar components. Each outlet includes a plurality of through holes spaced apart along the first direction.

[0012] Optionally, the width of the exhaust support member along the second direction is K, the thickness of the exhaust support member along the third direction is M, and the wall thickness of the exhaust support member is T. The relationship between K and M satisfies: 48mm 2 ≤K×M≤560mm 2 ; The value of T is in the range of 0.5mm≤T≤3mm.

[0013] Optionally, each end of the polar component is provided with two guide surfaces at opposite ends along the first direction, and the two guide surfaces located at the same end of the polar component are respectively disposed on both sides of the polar component along the second direction; the guide surfaces are inclined relative to the first end faces of the polar component that are opposite each other along the first direction. The included angle between the two guide surfaces located at the same end of the polar component is N2; The range of N2 is: 50°≤N2≤100°.

[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 two electrode components. Each electrode component has a T-shaped extension on each of its two opposite end faces along a first direction. The extension includes a first boss and a second boss. The first boss extends along a second direction, and the second boss is connected to the middle position of the first boss along the second direction. The second boss is located on the side of the first boss away from the other electrode component along the first direction. The two electrode components are symmetrically arranged along a third direction. The two opposite extensions along the third direction in the two electrode components together form a cross-shaped expansion boss. The arrangement of the first and second bosses increases the volume of the battery cell electrode assembly, thus improving the battery cell's capacity. The assembly ratio and energy density of the battery cell electrode assembly within the closed cavity formed by the battery cell housing and the battery cell cover are higher. Furthermore, the matching of the corresponding positions of the first and second bosses with the battery cell cover improves the positioning accuracy between the battery cell cover and the battery cell electrode assembly. When the battery cell cover presses the battery cell electrode assembly into the housing, the insertion direction of the battery cell electrode assembly is determined, making it less prone to scratches and resulting in a higher assembly yield.

[0016] The cell electrode assembly also includes a venting support, which is sandwiched between the two electrode assembly components along a third direction. The venting support penetrates the electrode assembly components along a first direction, forming a flow channel inside. The end of the venting support along the first direction has an inlet, and the end face of the venting support along the third direction facing the electrode assembly components has an outlet, both of which are connected to the flow channel. The venting support allows the electrolyte to flow from the end of the electrode assembly components along the first direction to the center of the electrode assembly components. The electrode assembly components have good wettability and can react quickly with the electrolyte. Simultaneously, the flow of the electrolyte can also carry away some heat from the center of the electrode assembly components, achieving a cooling effect and resulting in good cell performance.

[0017] This invention provides a battery cell including the aforementioned battery cell electrode assembly. By employing the aforementioned battery cell electrode assembly, the positioning accuracy between it and the battery cell housing and battery cell cover is high, the battery cell electrode assembly is not easily damaged by pressure, the battery cell electrode assembly has a larger volume, high space utilization, and the battery cell has high capacity and assembly ratio. Moreover, the setting of the venting support component ensures good wettability of the battery cell electrode assembly, resulting in excellent battery cell performance. Attached Figure Description

[0018] 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.

[0019] Figure 1 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point I; Figure 3 This is a top view of the cell electrode assembly provided in an embodiment of the present invention; Figure 4 yes Figure 3 Sectional view of section II-II; Figure 5 yes Figure 4 Enlarged view of a section at point III; Figure 6 yes Figure 3 Sectional view of section IV-IV; Figure 7 This is a front view of the cell electrode assembly provided in an embodiment of the present invention; Figure 8 This is a right view of the cell electrode assembly provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the exhaust support member provided in the embodiment of the present invention; Figure 10 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 11 This is a top view of the battery cell provided in an embodiment of the present invention; Figure 12 yes Figure 11 Sectional view of section V-V; Figure 13 yes Figure 11 Sectional view of section VI-VI; 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; Figure 16 This is a schematic diagram of the battery cell cover plate provided in an embodiment of the present invention from another perspective.

[0020] In the picture: 100. Cell electrode assembly; 110. Electrode assembly components; 111. First end face; 112. Second end face; 113. Third end face; 114. Fourth end face; 1141. Mounting groove; 116. Guide surface; 120. First boss; 121. First end face; 122. Arc-shaped surface; 130. Second boss; 131. Second end face; 132. First side face; 133. Second side face; 134. Third side face; 140. Third boss; 1401. Clearance groove; 141. Fifth end face; 142. Second side wall; 150. Electrode tab; 160. Exhaust support; 1601. Flow channel; 161. Inlet; 162. Through hole; 200. Cell cover plate; 210. Encapsulation cover; 211. Cover plate body; 212. First protective protrusion; 213. Second protective protrusion; 220. Second plastic part; 221. Plastic part body; 222. First mating protrusion; 223. Second mating protrusion; 230. First plastic part; 240. Connector; 250. Terminal base plate; 260. Terminal body; 300. Cell housing; 310. Housing body; 311. Opening; 312. Extension flange; 313. Capacity expansion protrusion; 320. Cooling component; 321. L-shaped plate; 322. Heat dissipation fin. Detailed Implementation

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] like Figures 1-2 ,as well as Figure 10 As shown, this embodiment provides a cell electrode assembly 100, which can be adapted to some irregularly shaped cell cover plates 200 and cell housings 300. Through special structural designs, the cell cover plates 200 and cell housings 300 can increase the assembly space of the cell electrode assembly 100, thereby improving the energy density of the cell and achieving a high assembly ratio. The positioning between the cell electrode assembly 100 and the cell cover plate 200 is accurate, and the cell cover plate 200 can apply uniform pressure to the cell electrode assembly 100, ensuring force balance when the cell electrode assembly 100 is inserted into the housing, reducing the risk of damage or fragmentation. Simultaneously, the cell cover plate 200 provides good protection for the connector 240 and the terminal post, preventing damage during the manufacturing process, improving the safety performance of the cell, and ensuring a good appearance. Furthermore, the center of the cell electrode assembly 100 has good wettability, resulting in excellent cell performance.

[0026] Specifically, see Figures 1-6 In this embodiment, the cell electrode assembly 100 includes two electrode components 110. Each electrode component 110 has a T-shaped extension on each of its two opposing first end faces 111 along a first direction. The extension includes a first boss 120 and a second boss 130. The first boss 120 extends along a second direction, and the second boss 130 is connected to the middle position of the first boss 120 along the second direction. The second boss 130 is located on the side of the first boss 120 away from the other electrode component 110 along a third direction. The two electrode components 110 are symmetrically arranged along a third direction, and the two opposing extensions along the third direction in the two electrode components 110 together form a cross-shaped expansion boss. By setting the first boss 120 and the second boss 130, the volume of the cell electrode assembly 100 is increased, and the capacity of the cell is improved. The cell electrode assembly 100 has a higher assembly ratio and energy density within the closed cavity formed by the cell housing 300 and the cell cover plate 200. In addition, by cooperating with the corresponding positions of the first boss 120, the second boss 130 and the cell cover plate 200, the positioning accuracy between the cell cover plate 200 and the cell electrode group 100 is improved. When the cell cover plate 200 presses the cell electrode group 100 into the shell, the insertion direction of the cell electrode group 100 into the shell is determined, it is not easy to be scratched, and the assembly yield is high.

[0027] The first direction mentioned above is the length direction of the polar component 110, which is also Figure 1 The X-axis direction is shown; the second direction is the width direction of the polar component 110, which is also... Figure 1 The Y-axis direction shown is shown; the third direction is the thickness direction of the polar component 110, which is also... Figure 1 The Z-axis direction is shown in the figure.

[0028] Furthermore, the cell electrode assembly 100 also includes an exhaust support 160, which is sandwiched between the two electrode assembly sub-assemblies 110 along a third direction. By adopting a separate arrangement for the cell electrode assembly 100, the electrode assembly sub-assemblies 110 can be easily assembled with the exhaust support 160. The exhaust support 160 penetrates the electrode assembly sub-assemblies 110 along a first direction, forming a flow channel 1601 inside the exhaust support 160. The exhaust support 160 has an inlet 161 at its end along the first direction and an outlet on its end face facing the electrode assembly sub-assemblies 110 along a third direction. Both the inlet 161 and the outlet are connected to the flow channel 1601. After the cell electrode assembly 100 is assembled with the cell housing 300 and the cell cover plate 200, electrolyte is injected into the closed cavity formed by the cell housing 300 and the cell cover plate 200. The electrolyte can flow through the inlet 161, the flow channel 1601, and the outlet to the end faces of the two electrode assembly sub-assemblies 110 that are close to each other. By setting the exhaust support 160, the electrolyte can flow from the end of the electrode component 110 along the first direction to the center of the electrode component 110. The electrode component 110 has good wettability and can react quickly with the electrolyte. At the same time, the flow of the electrolyte can also carry away some of the heat at the center of the electrode component 110, which has a cooling effect, resulting in good cell performance.

[0029] Optionally, the exhaust support 160 is made of insulating material to ensure good electrical safety of the cell electrode assembly 100. For example, in some embodiments, the exhaust support 160 can be made of plastic materials such as PP, PE, and PPS. Of course, in other embodiments, ceramic or other lightweight insulating materials can also be selected.

[0030] See also Figures 1-2 The first boss 120 is a cuboid, and the second boss 130 is a frustum. The peripheral sidewalls of the first boss 120 and the second boss 130, which are parallel to the first direction, are connected by an arc-shaped surface 122. The first boss 120 and the second boss 130 together form a T-shaped extension. By providing an arc-shaped surface 122 for the transition connection between the first boss 120 and the second boss 130, it is convenient to process the electrode component 110.

[0031] Optionally, the end face of the first boss 120 facing the cell cover 200 is a first end face 121, which is parallel to the first end face 111. The second boss 130 includes a second end face 131, a first side face 132, a second side face 133, and two third side faces 134. The second end face 131 faces the cell cover 200 and is parallel to the first end face 111. The first side face 132 is located on the side closer to the first boss 120 along a third direction. The two ends of the first side face 132 are respectively connected to the second end face 131 and the first end face 121. The first side face 132 is inclined relative to the second end face 131. The second end face 131 is connected to the second side face 133 on the other side away from the first protrusion 120 along the third direction. The second side face 133 is parallel to the second end face 112 of the polar component 110 away from the other polar component 110 along the third direction. The two third side faces 134 are respectively connected to the opposite sides of the second end face 131, the first side face 132 and the second side face 133 along the second direction. The third side faces 134 are parallel to the third end face 113 of the polar component 110 along the second direction.

[0032] See Figure 7 Along the first direction, the height difference between the second end face 131 and the first end face 111 is H1, and the height difference between the first end face 121 and the first end face 111 is H2. The relationship between H1 and H2 satisfies: 10mm ≤ H1 - H2 ≤ 35mm. For example, the value of H1 - H2 can be 10mm, 15mm, 20mm, 25mm, 30mm, or 35mm, etc. The value of H1 - H2 is the height difference between the first protrusion 120 and the second protrusion 130. By limiting the value of H1 - H2 to the above range, the height of the first protrusion 120 and the second protrusion 130 along the first direction is relatively large, resulting in a larger increase in the volume of the cell electrode assembly 100 and a greater increase in cell capacity. If the value of H1-H2 is too small, the height of the first protrusion 120 and the second protrusion 130 along the first direction is small, the volume increase of the cell electrode group 100 is small, and the cell capacity improvement is not obvious; if the value of H1-H2 is too large, the height difference between the first protrusion 120 and the second protrusion 130 is too large, making it difficult to process and form, reducing the production yield, and reducing the structural strength of the second protrusion 130, which poses a risk of breakage at the connection between the second protrusion 130 and the first protrusion 120.

[0033] Optionally, the value of H1 can be in the range of 20mm ≤ H1 ≤ 70mm. For example, the value of H1 can be 20mm, 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, or 70mm, etc. By limiting the value of H1 to the above range, the height of the second protrusion 130 along the first direction is ensured to be relatively large, which in turn ensures that the height of the first protrusion 120 along the first direction is relatively large, resulting in a larger increase in the volume of the cell electrode assembly 100 and a greater increase in cell capacity. At the same time, the first protrusion 120 and the second protrusion 130 are easier to form.

[0034] Furthermore, the included angle between the first side faces 132 of the two second protrusions 130 facing each other along a third direction in the two electrode assembly parts 110 is N1, and the value of N1 is in the range of 80°≤N1≤140°. For example, the value of N1 can be 80°, 90°, 100°, 110°, 120°, 130°, 135° or 140°, etc. By limiting the value of N1 to the above range, the first end face 121 of the first protrusion 120 and the first side face 132 of the second protrusion 130 can be smoothly transitioned, the extension is easy to form, and the first side face 132 can play a good guiding role when the second protrusion 130 is assembled with the cell cover plate 200, the cell cover plate 200 and the cell electrode assembly 100 are accurately positioned, and the cell cover plate 200 is not easy to damage the cell electrode assembly 100.

[0035] See Figure 6 and Figure 8 Along the second direction, the width of the first protrusion 120 is W1, and the width of the electrode assembly 110 is A1. The relationship between W1 and A1 satisfies: 0.7 ≤ W1 / A1 ≤ 0.9. For example, the value of W1 / A1 can be 0.70, 0.75, 0.80, 0.85, or 0.90, etc. By limiting the value of W1 / A1 to the above range, it is ensured that the width of the first protrusion 120 along the second direction accounts for a large proportion of the width of the electrode assembly 110, resulting in a significant increase in the volume of the cell electrode assembly 100, a substantial increase in cell capacity, and ease of molding with high structural strength. If the value of W1 / A1 is too small, the width of the first protrusion 120 along the second direction is small, the volume increase of the cell electrode group 100 is small, and the cell capacity is not significantly improved; if the value of W1 / A1 is too large, the space occupied by the first protrusion 120 along the second direction is large, which affects the arrangement of the second plastic part 220 and the connector 240 on the cell cover plate 200. The arrangement space of the second plastic part 220 and the connector 240 is insufficient, the mechanical strength decreases, and the arrangement space of the electrode post 260 is also reduced, and the current carrying capacity of the cell decreases.

[0036] Along a third direction, the thickness of the first boss 120 is L1, and the thickness of the electrode assembly 110 is B2. The relationship between L1 and B2 satisfies: 0.3 ≤ L1 / B2 ≤ 0.55. For example, the value of L1 / B2 can be 0.40, 0.45, 0.50, 0.55, or 0.60, etc. By limiting the value of L1 / B2 to the above range, the thickness of the first boss 120 is larger, resulting in a larger volume of the cell electrode assembly 100 and a significant increase in cell capacity. Moreover, the first protective protrusion 212 at the position corresponding to the first boss 120 in the cell cover plate 200 is easy to stamp and form, with a high processing yield. Furthermore, the first protective protrusion 212 has high structural strength, providing good protection for the cell electrode assembly 100.

[0037] See also Figure 6 and Figure 8 A third protrusion 140 is provided on the second end face 112 of the electrode assembly 110, and the third protrusion 140 extends in a third direction away from the other electrode assembly 110. By setting the third protrusion 140, the volume of the cell electrode assembly 100 can be further increased, thereby improving the cell capacity.

[0038] Optionally, along the second direction, the width of the second protrusion 130 is W2, and the width of the third protrusion 140 is A2. The relationship between W2 and A2 satisfies: 0.3 ≤ W2 / A2 ≤ 0.55. For example, the value of W2 / A2 can be 0.30, 0.35, 0.40, 0.45, 0.50, or 0.55, etc. By limiting the value of W2 / A2 to the above range, the width of the second protrusion 130 along the second direction is larger, the volume of the cell electrode assembly 100 increases significantly, and the capacity of the cell electrode assembly 100 is significantly improved. The relationship between A1 and A2 satisfies: 0.65 ≤ A2 / A1 ≤ 0.85. For example, the value of A2 / A1 can be 0.65, 0.70, 0.75, 0.80, or 0.85, etc. By limiting the value of A2 / A1 within the above range, the width of the third protrusion 140 along the second direction is larger, the volume of the cell electrode group 100 is increased significantly, and the capacity of the cell electrode group 100 is significantly improved.

[0039] See also Figure 2 and Figure 6 The end faces of the polar component 110 that are close to each other along the third direction are the fourth end face 114. The fourth end face 114 is provided with a mounting groove 1141. The mounting grooves 1141 on the two polar component 110 that are opposite each other along the third direction form an installation space. The exhaust support 160 is embedded in the installation space. The inlet 161 of the exhaust support 160 is exposed on the first end face 111 of the polar component 110.

[0040] Furthermore, the end face of the third protrusion 140 facing away from the other electrode component 110 along the third direction is the fifth end face 141, and the second side face 133 of the second protrusion 130 facing away from the first protrusion 120 along the third direction is flush with the fifth end face 141. Along the third direction, the distance between the fifth end face 141 and the fourth end face 114 is B1, and the relationship between B1 and B2 satisfies: 6mm ≤ B1 - B2 ≤ 30mm. The value of B2 - B1 is the height of the third protrusion 140 along the third direction. For example, the value of B1 - B2 can be 6mm, 10mm, 15mm, 20mm, 25mm, or 30mm, etc. By limiting the value of B1 - B2 to the above range, the volume of the third protrusion 140 is sufficiently large, resulting in a significant increase in the cell capacity, and the third protrusion 140 is easy to process and form, resulting in a high forming yield. If the value of B1-B2 is too small, the volume of the third boss 140 of the cell electrode group 100 will be small, which is not conducive to improving the capacity and assembly ratio of the cell. If the value of B1-B2 is too large, the processing difficulty at the position where the cell housing 300 and the cell cover plate 200 mate with the third boss 140 will increase, the molding yield will decrease, and the protection capability will be reduced.

[0041] See Figure 4 , Figure 5 and Figure 9 In this embodiment, the venting support 160 is a hollow cylindrical thin-walled structure. An inlet 161 is formed at each of the two ends of the venting support 160 along the first direction, and an outlet is provided on each of the two end faces of the venting support 160 facing the two electrode components 110. Each outlet includes multiple through holes 162 spaced apart along the first direction. By adopting the above design, the electrolyte can simultaneously enter the flow channel 1601 within the venting support 160 from both ends of the electrode components 110 along the first direction, and flow evenly through the multiple through holes 162 on the venting support 160 to the fourth end face 114 of the two electrode components 110, resulting in good and uniform wetting of the center position of the cell electrode assembly 100.

[0042] Optionally, the width of the exhaust support 160 along the second direction is K, and the thickness of the exhaust support 160 along the third direction is M. The relationship between K and M satisfies: 48mm 2 ≤K×M≤560mm 2 For example, the value of K×M can be 48mm. 2 60mm 2 80mm 2 100mm 2 200mm 2 300mm 2 400mm 2 500mm 2 Or 560mm 2By limiting the value of K×M within the above range, the cross-sectional area of ​​the flow channel 1601 formed inside the exhaust support 160 is ensured to be large, which meets the need for rapid flow of electrolyte, so that the electrolyte can contact the cell electrode assembly 100 as much as possible, the chemical reaction is timely, and the electrolyte can exchange heat with the fourth end face 114 of the electrode assembly 110 and carry away the heat, thus achieving a good auxiliary heat dissipation effect.

[0043] Furthermore, the wall thickness of the exhaust support 160 is T, and the value of T ranges from 0.5mm to 3mm. For example, the value of T can be 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, or 3.0mm, etc. By limiting the value of T to the above range, the exhaust support 160 is guaranteed to have high mechanical strength and is not prone to deformation.

[0044] See also Figure 2 and Figure 3 Each end of the electrode assembly 110 opposite to each other along the first direction is provided with two guide surfaces 116. The two guide surfaces 116 located at the same end of the electrode assembly 110 are respectively arranged on both sides of the electrode assembly 110 along the second direction. The guide surfaces 116 are inclined relative to the first end face 111 of the electrode assembly 110 opposite to each other along the first direction. The included angle between the two guide surfaces 116 located at the same end of the electrode assembly 110 is N2, and the value of N2 is in the range of 50°≤N2≤100°. For example, the value of N2 can be 50°, 60°, 70°, 80°, 90° or 100°. By limiting the value of N2 to the above range, the electrode assembly 110 can be well guided when the cell cover plate 200 piezoelectric electrode assembly 100 is inserted into the casing, and uniform pressure can be applied to the electrode assembly 110 to ensure that the electrode assembly 110 is under force balance. If the value of N2 is too small, the guiding effect on the electrode assembly 110 will be insignificant, the assembly of the cell electrode assembly 100 and the cell cover plate 200 will be inconvenient, and the force exerted by the cell cover plate 200 on the electrode assembly 110 will be relatively concentrated, which may easily damage the electrode assembly 110. If the value of N2 is too large, the guiding effect on the cell electrode assembly 100 will also be insignificant, the assembly of the cell electrode assembly 100 and the cell cover plate 200 will be inconvenient, and it will not be conducive to increasing the length of the electrode assembly 110 along the first direction.

[0045] The first end face 111 of the electrode assembly 110 is also provided with a tab 150, which is L-shaped and extends to the guide surface 116. The tab 150 is welded to the electrode post 260 on the cell cover plate 200. By setting the tab 150 to L-shape, the current-passing area of ​​the tab 150 is increased, which is beneficial to improving the current-passing capacity of the cell.

[0046] See Figures 10-13This embodiment also provides a battery cell, which includes the aforementioned battery cell electrode assembly 100, battery cell housing 300, and two battery cell cover plates 200. The battery cell housing 300 has two openings 311 at both ends along a first direction, and each opening 311 is connected to a battery cell cover plate 200. The battery cell electrode assembly 100 is encapsulated by the two battery cell cover plates 200 and the battery cell housing 300. By adopting a specially designed battery cell electrode assembly 100, it is ensured that the battery cell electrode assembly 100 is not easily damaged by pressure. The battery cell housing 300 and the battery cell cover plates 200 provide good positioning and support for the battery cell electrode assembly 100, while increasing the arrangement space of the battery cell electrode assembly 100. The space utilization rate of the battery cell electrode assembly 100 within the battery cell housing 300 is high, and the battery cell has a high capacity and assembly ratio. Moreover, the setting of the exhaust support 160 ensures good wettability of the battery cell electrode assembly 100, resulting in excellent battery cell performance.

[0047] See Figure 13 and Figure 14 In this embodiment, the cell housing 300 includes a housing body 310 and a cooling component 320. The housing body 310 has a cylindrical structure, and the openings 311 are formed at both ends of the housing body 310 along the first direction. The end of the housing body 310 along the first direction is provided with an extending flange 312, which is used for welding to the encapsulation cover 210 in the cell cover plate 200.

[0048] The housing body 310 has an expansion protrusion 313 on its opposite end faces along a third direction. The expansion protrusion 313 mates with the third boss 140 of the cell electrode assembly 100. The third boss 140 of the electrode assembly sub-assembly 110 includes a fifth end face 141 facing away from the other electrode assembly sub-assembly 110 and two second sidewalls 142 opposite each other along a second direction. The second sidewalls 142 and the second end faces 112 of the electrode assembly sub-assembly 110 form a clearance groove 1401 (see...). Figure 8 The corresponding expansion protrusion 313 on the housing body 310 also forms clearance spaces on both sides along the second direction, and the cooling element 320 is disposed in the clearance space. There are a total of four clearance spaces in the circumference of the housing body 310, and four cooling elements 320 are also provided. Through the four cooling elements 320, heat can be exchanged with the periphery of the housing body 310, so that the temperature of the cell electrode assembly 100 drops rapidly and uniformly, the temperature of the cell electrode assembly 100 is suitable during operation, and the thermal management effect is good.

[0049] Optionally, the cooling component 320 includes an L-shaped plate 321 extending along a first direction and a plurality of heat dissipation fins 322, which are spaced apart along the first direction. The heat dissipation fins 322 can quickly dissipate heat, accelerating the cooling rate of the cell electrode assembly 100.

[0050] See also Figure 12 , Figure 15 and Figure 16In this embodiment, the cell cover plate 200 includes an encapsulation cover 210, a first plastic part 230, a second plastic part 220, a connector 240, a terminal base plate 250, and a terminal body 260. The terminal base plate 250, the second plastic part 220, the encapsulation cover 210, the first plastic part 230, and the connector 240 are stacked sequentially along a first direction. The first plastic part 230 insulates the connector 240 from the cover plate body 211, and the second plastic part 220 insulates the cover plate body 211 from the terminal base plate 250 and the cell electrode assembly 100.

[0051] The encapsulation cover 210 includes a cover body 211, a first protective protrusion 212, and a second protective protrusion 213. The second plastic part 220 includes a plastic part body 221, a first mating protrusion 222, and a second mating protrusion 223. The first mating protrusion 222 corresponds to and fits into the first protective protrusion 212, and the second mating protrusion 223 corresponds to and fits into the second protective protrusion 213. The first boss 120 of the polarization component 110 extends into and mates with the first mating protrusion 222, and the second boss 130 of the polarization component 110 extends into and mates with the second mating protrusion 223.

[0052] The cell cover 200 also includes four electrode posts 260, which are arranged in two groups on both sides of the first protective protrusion 212 along a third direction. Each electrode post 260 is located at one corner of the cell cover 200. The electrode post 260 passes through the second plastic part 220, the cover body 211, the first plastic part 230, and the connector 240. One end of each electrode post 260 is connected to the electrode post base plate 250, and the other end of the electrode post 260 is connected to the connector 240. The electrode post base plate 250 is electrically connected to the tabs 150 on the electrode group component 110 to conduct current. The connector 240 is used to connect to the busbar of series / parallel cells. Since the electrode post 260 is located on the side of the first protective protrusion 212, and the end faces of the electrode post 260 and the connector 240 on the side away from the cell electrode assembly 100 along the first direction are both lower than the first protective protrusion 212, it can provide good protection for the connector 240 and the electrode post 260, 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 first protective protrusion 212, saving assembly space for the battery module, increasing the module assembly rate, and thus improving the performance indicators of the battery module.

[0053] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned cell electrode group 100. See Table 1 for details.

[0054] Table 1 As can be seen from the above results, the value ranges of parameters H1-H2, H1, B1-B2, L1 / B2, A2 / A1, W1 / A1, W2 / A2, K×M, N1, and N2 in Examples 1 to 6 meet their corresponding size limitations. The yield rate of the battery cell electrode assembly 100 and the battery cell housing 300 is high. The positioning of the battery cell electrode assembly 100, the battery cell cover plate 200, and the battery cell housing 300 is accurate. After assembly, the battery cell electrode assembly 100 is free from deformation and damage. The volume of the battery cell electrode assembly 100 is significantly increased, and the battery cell capacity is large, meeting the need for high energy storage. In addition, the wettability of the battery cell electrode assembly 100 is good.

[0055] In Comparative Example 1, the value of parameter H1-H2 is less than the minimum value of 10mm≤H1-H2≤35mm. At this time, the height of the second protrusion 130 along the first direction is small, the volume increase of the cell electrode group 100 is limited, the cell capacity increase is not obvious, and the cell electrode group 100 product is defective.

[0056] In Comparative Example 2, the value of parameter H1-H2 is greater than the maximum value of 10mm≤H1-H2≤35mm. At this time, the height of the second boss 130 along the first direction is too large, which increases the processing difficulty and cost of the second protective protrusion 213 at the part of the cell cover plate 200 that mates with the second boss 130, and results in defective products of the cell electrode group 100.

[0057] In Comparative Example 3, the value of parameter L1 / B2 is less than the minimum value of 0.3 ≤ L1 / B2 ≤ 0.55. At this time, the thickness of the first protrusion 120 along the third direction is too small, the volume increase of the cell electrode group 100 is limited, the capacity increase of the cell is not obvious, and the cell electrode group 100 product is defective.

[0058] In Comparative Example 4, the value of parameter L1 / B2 is greater than the maximum value of 0.3 ≤ L1 / B2 ≤ 0.55. The thickness of the first boss 120 along the third direction is too large, resulting in a large space occupied by the first protective protrusion 212 in the cell cover 200 that mates with the first boss 120 along the third direction. This reduces the arrangement space for the second plastic part 220, the connector 240, and the electrode post 260, leading to low structural strength of the second plastic part 220 and the connector 240, decreased current carrying capacity of the cell cover 200, and defective cell electrode assembly 100.

[0059] In Comparative Example 5, the value of parameter K×M is less than 48 mm. 2 ≤K×M≤560mm 2 The minimum value. At this time, the cross-sectional size of the exhaust support 160 is small, and the exhaust effect of the battery cell, the effect of electrolyte wetting of the battery cell electrode group 100, and the cooling effect of the battery cell electrode group 100 are all reduced, resulting in poor battery cell safety performance and defective battery cell electrode group 100 products.

[0060] In Comparative Example 6, the value of parameter K×M is greater than 48 mm. 2≤K×M≤560mm 2 The maximum value. At this time, the cross-sectional size of the exhaust support 160 is too large, which occupies the arrangement space of the electrode group 110, the increase in cell capacity is small, and the weight and cost of the exhaust support 160 increase, resulting in defective cell electrode group 100 products.

[0061] Taking all factors into consideration, when the dimensions of the cell electrode assembly 100 meet the above-mentioned dimensional requirements, a high yield rate can be ensured for the assembly of the cell electrode assembly 100 with the cell housing 300 and the cell cover plate 200, and accurate positioning between the cell electrode assembly 100 and the cell housing 300 and the battery cover plate. After assembly, the cell electrode assembly 100 exhibits no deformation or damage, its volume is significantly increased, and the cell capacity is larger, meeting the needs of high energy storage. Furthermore, the cell's venting effect, the electrolyte wetting effect of the cell electrode assembly 100, and the cooling effect of the cell electrode assembly 100 are all superior.

[0062] 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, The cell electrode assembly includes: The two polar components are divided into two parts. Each polar component has a T-shaped extension on its two opposite end faces along a first direction. The extension includes a first boss and a second boss. The first boss extends along a second direction, and the second boss is connected to the middle position of the first boss along the second direction. The second boss is located on the side of the first boss away from the other polar component along a third direction. The two polar components are symmetrically arranged along a third direction. The two opposite extensions along the third direction in the two polar components together form a cross-shaped expansion boss. An exhaust support is provided, which is sandwiched between the two polar component components along a third direction and penetrates the polar component components along a first direction. A flow channel is formed inside the exhaust support, and an inlet is provided at the end of the exhaust support along the first direction. An outlet is provided on the end face of the exhaust support facing the polar component along a third direction. Both the inlet and the outlet are connected to the flow channel.

2. The cell electrode assembly according to claim 1, characterized in that, The first boss is a cuboid, and the second boss is a frustum; the first boss and the second boss are connected by an arc-shaped transition surface; Wherein, the end face of the first protrusion facing the cell cover is the first end face, and the first end face is parallel to the first end face; the second protrusion includes a second end face, a first side face, a second side face and two third side faces, the second end face faces the cell cover and is parallel to the first end face, the first side face is located on the side close to the first protrusion along the third direction, the two ends of the first side face are respectively connected to the second end face and the first end face, the first side face is inclined relative to the second end face, the second end face is connected to the other side away from the first protrusion along the third direction, the second side face is parallel to the second end face of the electrode component along the third direction away from the other electrode component, the two third side faces are respectively connected to the opposite sides of the second end face, the first side face and the second side face along the second direction, and the third side faces are parallel to the third end faces of the electrode components along the second direction; Along the first direction, the height difference between the second end face and the first end face is H1, and the height difference between the first end face and the first end face is H2; The relationship between H1 and H2 satisfies: 10mm ≤ H1 - H2 ≤ 35mm; The value range of H1 is: 20mm≤H1≤70mm.

3. The cell electrode assembly according to claim 2, characterized in that, The included angle between the first platform sides of the two second protrusions that are opposite each other along the third direction in the two polar component components is N1; The range of N1 is: 80°≤N1≤140°.

4. The cell electrode assembly according to claim 2, characterized in that, Along the second direction, the width of the first boss is W1, and the width of the polar component is A1; The relationship between W1 and A1 satisfies: 0.7 ≤ W1 / A1 ≤ 0.9; Along the third direction, the thickness of the first boss is L1, and the thickness of the polar component is B2; The relationship between L1 and B2 satisfies: 0.3≤L1 / B2≤0.

55.

5. The cell electrode assembly according to claim 4, characterized in that, A third protrusion is provided on the second end face of the polar component, and the third protrusion extends in a third direction away from the other polar component. Along the second direction, the width of the second boss is W2, and the width of the third boss is A2; The relationship between W2 and A2 satisfies: 0.3 ≤ W2 / A2 ≤ 0.55; The relationship between A1 and A2 satisfies: 0.65≤A2 / A1≤0.

85.

6. The cell electrode assembly according to claim 5, characterized in that, The end face of the polar component that is close to each other along the third direction is the fourth end face, and the end face of the third boss that is away from the other polar component along the third direction is the fifth end face. Along the third direction, the distance between the fifth end face and the fourth end face is B1; The relationship between B1 and B2 satisfies: 6mm≤B1-B2≤30mm.

7. The cell electrode assembly according to claim 1, characterized in that, The exhaust support is a hollow cylindrical thin-walled structure. An inlet is formed at each of the two ends of the exhaust support along the first direction. An outlet is provided on each of the two end faces of the exhaust support facing the two polar components. Each outlet includes a plurality of through holes spaced apart along the first direction.

8. The cell electrode assembly according to claim 7, characterized in that, The exhaust support member has a width of K along the second direction and a thickness of M along the third direction; the exhaust support member has a wall thickness of T. The relationship between K and M satisfies: 48mm 2 ≤K×M≤560mm 2 ; The value of T is in the range of 0.5mm≤T≤3mm.

9. The cell electrode assembly according to claim 1, characterized in that, Each end of the polar component is provided with two guide surfaces at opposite ends along the first direction, and the two guide surfaces located at the same end of the polar component are respectively disposed on both sides of the polar component along the second direction; the guide surfaces are inclined relative to the first end faces of the polar component that are opposite each other along the first direction. The included angle between the two guide surfaces located at the same end of the polar component is N2; The range of N2 is: 50°≤N2≤100°.

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

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