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

Abstract

This invention belongs to the field of battery technology, specifically disclosing a cell electrode assembly and a cell. The cell electrode assembly includes an electrode assembly body, which comprises a first part, a second part, a third part, and a fourth part. The first and second parts are arranged side-by-side along a second direction and separated by a first gap. The third and fourth parts are arranged side-by-side along the second direction and separated by a second gap. The third part and the first part are stacked along a third direction and separated by a third gap. The fourth part and the second part are stacked along a third direction and separated by a fourth gap. The first, second, third, and fourth gaps converge and connect at the center of the cross-section of the electrode assembly body perpendicular to the first direction, forming a heat dissipation space. This heat dissipation space helps dissipate heat in the central area of ​​the cell electrode assembly, resulting in good cooling effect and a long service life. This invention also provides a cell comprising the above-described 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, heat is concentrated at the center of existing battery cell electrode assemblies, resulting in poor heat dissipation and affecting the high-rate fast charging performance of the cells. Moreover, the ends of the battery cell electrode assemblies are generally designed with a planar structure, which cannot match the shape of some specially designed battery cell cover plates, leading to low space utilization and reduced cell capacity and assembly ratio. 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 the battery cell electrode assembly has high capacity and strength.

[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, a second part, a third part, and a fourth part. The first part, the second part, the third part, and the fourth part all extend along a first direction. The first part and the second part are arranged side by side along a second direction and separated by a first gap. The third part and the fourth part are arranged side by side along the second direction and separated by a second gap. The third part and the first part are stacked along a third direction and separated by a third gap. The fourth part and the second part are stacked along a third direction and separated by a fourth gap. The first gap, the second gap, the third gap, and the fourth gap converge and connect at the center of the cross-section of the electrode assembly body perpendicular to the first direction to form a heat dissipation space.

[0006] Optionally, the first part is provided with a first protrusion on the side away from the third part along the third direction, and the second part is provided with a second protrusion on the side away from the fourth part along the third direction. The first protrusion and the second protrusion are arranged side by side along the second direction and separated by the first gap. The third component has a third protrusion on the side opposite to the first component along the third direction, and the fourth component has a fourth protrusion on the side opposite to the second component along the third direction. The third protrusion and the fourth protrusion are arranged side by side along the second direction and separated by the second gap.

[0007] Optionally, along the second direction, the width of the first boss is L1, and the width of the first split body is A2; The relationship between L1 and A2 satisfies: 0.5≤L1 / A2≤0.8.

[0008] Optionally, the first split and the third split are respectively provided with a first step and a third step at the center of the cross section of the electrode assembly body perpendicular to the first direction; the third gap includes a first central region and a first edge region, the first central region is formed between the first step and the third step, and the first edge region is close to the side of the electrode assembly body along the second direction; the dimension of the first central region along the third direction is larger than the dimension of the first edge region along the third direction. The second and fourth components are respectively provided with a second step portion and a fourth step portion at the center of the cross section perpendicular to the first direction near the main body of the pole assembly; the fourth gap includes a second central region and a second edge region, the second central region is formed between the second step portion and the fourth step portion, and the second edge region is near the other side of the main body of the pole assembly along the second direction; the size of the second central region along the third direction is larger than the size of the second edge region along the third direction; Along the second direction, the distance between the opposite sides of the first central region and the second central region is W, and the width of the pole group body along the second direction is A1; The relationship between W and A1 satisfies: 0.3≤W / A1≤0.5.

[0009] Optionally, the first segment has a fifth protrusion at its end along the first direction, the second segment has a sixth protrusion at its end along the first direction, the third segment has a seventh protrusion at its end along the first direction, and the fourth segment has an eighth protrusion at its end along the first direction. The fifth protrusion and the sixth protrusion are arranged side by side along the second direction and separated by a first gap. The seventh protrusion and the eighth protrusion are arranged side by side along the second direction and separated by a second gap. The fifth protrusion and the seventh protrusion are stacked along the third direction and separated by a third gap. The sixth protrusion and the eighth protrusion are stacked along the third direction and separated by a fourth gap. Along the second direction, the width of the fifth boss (112) is L2; The relationship between L2 and A2 satisfies: 0.5≤L2 / A2≤0.85.

[0010] Optionally, along the third direction, the height of the first edge region is T, the distance between the end faces of the fifth protrusion and the seventh protrusion on opposite sides along the third direction is F, and the thickness of the pole group body is B1. The relationship between F, T, and B1 satisfies: 0.3 ≤ (FT) / B1 ≤ 0.65; The value of T is in the range of 1.5mm ≤ T ≤ 4mm; The value range of B1 is: 150mm≤B1≤550mm.

[0011] Optionally, along a third direction, the distance between the end faces of the first split and the third split that are opposite to each other is B2; The relationship between B1 and B2 satisfies: 16mm≤B1-B2≤60mm.

[0012] Optionally, the first split body is provided with a fifth protrusion at both ends along the first direction, and the distance between the two fifth protrusions on opposite sides along the first direction is E; The value range of E is: 300mm≤E≤1000mm; The length of the fifth protrusion along the first direction is H; The value range of H is: 10mm≤H≤50mm.

[0013] Optionally, along the second direction, a first guide surface and a second guide surface are respectively provided on the opposite sides of the first split and the second split, and the included angle between the first guide surface and the second guide surface is N; The range of N is: 50°≤N≤120°.

[0014] On the other hand, the present invention provides a battery cell including a battery cell electrode assembly and a cooling assembly as described in any of the above embodiments. The cooling assembly includes a first cooling plate and a second cooling plate extending along a first direction. The first cooling plate and the second cooling plate are cross-shaped in a cross section perpendicular to the first direction. The first cooling plate and the second cooling plate have cavities for coolant to flow through. The first cooling plate is sandwiched in a third gap and a fourth gap of the battery cell electrode assembly, and the second cooling plate is sandwiched in a first gap and a second gap of the battery cell electrode assembly. The cooling assembly is used to cool and reduce the temperature of the first, second, third, and fourth parts of the battery cell electrode assembly.

[0015] The beneficial effects of this invention are as follows: This invention provides a battery cell electrode assembly, comprising an electrode assembly body. The electrode assembly body includes a first segment, a second segment, a third segment, and a fourth segment. The first and second segments are arranged side-by-side along a second direction and separated by a first gap. The third and fourth segments are arranged side-by-side along the second direction and separated by a second gap. The third segment and the first segment are stacked along a third direction and separated by a third gap. The fourth segment and the second segment are stacked along a third direction and separated by a fourth gap. The first, second, third, and fourth gaps converge and connect at the center of the cross-section of the electrode assembly body perpendicular to the first direction, forming a heat dissipation space. This heat dissipation space helps dissipate heat in the central area of ​​the battery cell electrode assembly, resulting in good cooling effect and a longer service life.

[0016] The present invention also provides a battery cell, including the aforementioned battery cell electrode assembly and a cooling assembly. The cooling assembly can cool and lower the temperature of the central area of ​​the battery cell electrode assembly, resulting in good heat dissipation performance of the battery cell electrode assembly. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 2 This is a top view of the cell electrode assembly provided in an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view of section I-I; Figure 4 This is a schematic diagram of the assembled structure of the battery cell electrode assembly and cooling components provided in this embodiment of the invention; Figure 5 This is a top view of the assembled battery cell electrode assembly and cooling components provided in this embodiment of the invention; Figure 6 yes Figure 5 Sectional view of section II-II; Figure 7 yes Figure 6 Enlarged view of a section at point III; Figure 8 This is a front view of the assembled battery cell electrode assembly and cooling components provided in this embodiment of the invention; Figure 9 This is a schematic diagram of the structure of the first and second parts provided in the embodiments of the present invention; Figure 10 This is a schematic diagram of the structure of the third and fourth components provided in the embodiments of the present invention; Figure 11 This is a schematic diagram of the cooling assembly provided in an embodiment of the present invention; Figure 12 This is a top view of the cooling assembly provided in an embodiment of the present invention; Figure 13 yes Figure 12Sectional view of section IV-IV; Figure 14 yes Figure 12 Sectional view of section V-V; Figure 15 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 16 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 17 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 18 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 body; 101. First gap; 102. Second gap; 103. Third gap; 1031. First edge region; 1032. First central region; 104. Fourth gap; 1041. Second edge region; 1042. Second central region; 110. First segment; 111. First boss; 112. Fifth boss; 113. First step; 114. First guide surface; 115. First clearance step; 120. Second segment; 121. Second boss; 122. Sixth boss; 123. Second step; 124. Second guide surface; 125. Second clearance step; 130. Third segment; 131. Third boss; 132. Seventh boss; 133. Third step; 140. Fourth segment; 141. Fourth boss; 142. Eighth boss; 143. Fourth step; 150. Electrode lug; 200, Cooling assembly; 210, First cooling plate; 211, Solid plate body; 212, Hollow plate body; 213, First connecting part; 214, Second connecting part; 220, Second cooling plate; 230, First cooling bracket; 231, Inlet; 240, Second cooling bracket; 241, Outlet; 300, Cell housing; 301, Opening; 310, First end plate; 311, First mating protrusion; 3111, Through hole; 3112, Limiting plate; 320, Second end plate; 321, Second mating protrusion; 322, Flange; 3221, Inclined part; 400, Cell cover plate; 410, Cover plate body; 411, Protective protrusion; 420, First plastic part; 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 Figures 1-3 ,as well as Figure 15 and Figure 16 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 [link to relevant documentation] Figures 1-3In this embodiment, the battery cell electrode assembly includes an electrode assembly body 100. The electrode assembly body 100 includes a first segment 110, a second segment 120, a third segment 130, and a fourth segment 140. The first segment 110, second segment 120, third segment 130, and fourth segment 140 all extend along a first direction. The first segment 110 and second segment 120 are arranged side-by-side along a second direction and separated by a first gap 101. The third segment 130 and fourth segment 140 are arranged side-by-side along the second direction and separated by a second gap 102. The third segment 130 is stacked with the first segment 110 along a third direction and separated by a third gap 103. The fourth segment 140 is stacked with the second segment 120 along a third direction and separated by a fourth gap 104. The first gap 101, second gap 102, third gap 103, and fourth gap 104 converge and connect at the center of the cross-section of the electrode assembly body 100 perpendicular to the first direction, forming a heat dissipation space. The aforementioned first direction is... Figure 1 The X-axis direction shown is the second direction. Figure 1 The Y-axis direction shown is the third direction. Figure 1 The Z-axis direction is shown in the diagram. By adopting the above structural design, the heat dissipation efficiency of the central region of the battery cell electrode assembly can be improved. The central region of the battery cell electrode assembly has good heat dissipation and temperature uniformity, resulting in superior performance of the battery cell electrode assembly during operation.

[0025] See Figures 4-8 In this embodiment, the battery cell electrode assembly can be used in conjunction with the cooling assembly 200, which assists in rapid heat dissipation of the battery cell electrode assembly. Specifically, the cooling assembly 200 includes a first cooling plate 210 and a second cooling plate 220 extending along a first direction. The first cooling plate 210 and the second cooling plate 220 intersect in a cross shape in a cross section perpendicular to the first direction, and the two ends of the first cooling plate 210 and the second cooling plate 220 are aligned along their length. Both the first cooling plate 210 and the second cooling plate 220 have cavities for coolant flow, and the cavities in the first cooling plate 210 and the second cooling plate 220 converge and connect at the intersection. The first cooling plate 210 is disposed within the third gap 103 and the fourth gap 104 to cool the end faces of the first split body 110 and the third split body 130 that are close to each other along the third direction, as well as the end faces of the second split body 120 and the fourth split body 140 that are close to each other. The second cooling plate 220 is disposed within the first gap 101 and the second gap 102, and is used to cool and reduce the end faces of the first part 110 and the second part 120 that are close to each other along the second direction, as well as the end faces of the third part 130 and the fourth part 140 that are close to each other along the second direction.

[0026] Therefore, the first cooling plate 210 and the second cooling plate 220 can contact the center of the cell electrode assembly. The coolant in the first cooling plate 210 and the second cooling plate 220 can promptly remove the heat from the center of the cell electrode assembly, accelerating heat dissipation in the central area of ​​the cell electrode assembly. This results in good cooling effect, good temperature uniformity across all parts of the cell electrode assembly, good thermal management, and a long service life. Simultaneously, the cooling assembly 200 also provides positioning and support for the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140 of the electrode assembly body 100. After the electrode assembly body 100, the cooling assembly 200, and the cell housing 300 are assembled, the first cooling plate 210 and the second cooling plate 220 can support the cell housing 300, preventing the cell housing 300 from being deformed under pressure and squeezing the cell electrode assembly, thus providing good protection for the cell electrode assembly. Meanwhile, the first cooling plate 210 and the second cooling plate 220 can accurately position the first component 110, the second component 120, the third component 130 and the fourth component 140 inside the cell housing 300, preventing them from shaking inside the cell housing 300, and ensuring that the cell electrode assembly is fixed stably and reliably inside the cell housing 300.

[0027] See Figure 3 , Figure 6 ,as well as Figures 11-14 The cooling assembly 200 further includes a first cooling bracket 230 and a second cooling bracket 240. The first cooling bracket 230 and the second cooling bracket 240 are respectively connected to the two ends of the first cooling plate 210 along the second direction. The first cooling bracket 230 is attached to a portion of the end face of the first split 110 facing away from the second split 120 along the second direction, and a portion of the end face of the third split 130 facing away from the fourth split 140 along the second direction. The second cooling bracket 240 is attached to a portion of the end face of the second split 120 facing away from the first split 110 along the second direction, and a portion of the end face of the fourth split 140 facing away from the third split 130 along the second direction. The first cooling bracket 230 has a liquid inlet channel, and the second cooling bracket 240 has a liquid outlet channel. The first cooling bracket 230 and the second cooling bracket 240 are symmetrically arranged about the central axis of the cooling assembly 200 along the first direction. Both the inlet and outlet channels are connected to the cavity within the first cooling plate 210, and the cavities within the first cooling plate 210 and the second cooling plate 220 are connected. The first cooling bracket 230 has an inlet 231 connected to the inlet channel, and the second cooling bracket 240 has an outlet 241 connected to the outlet channel. This configuration allows the coolant to enter the central region of the battery cell electrode assembly from one side along the second direction, exchange heat with the battery cell electrode assembly through the first cooling plate 210 and the second cooling plate 220, and then flow out from the other side along the second direction, thus achieving rapid cooling of the battery cell electrode assembly.

[0028] See also Figure 3, Figure 9 and Figure 10 In this embodiment, the first segment 110 and the third segment 130 are respectively provided with a first step portion 113 and a third step portion 133 at the center of the cross-section of the electrode assembly body 100 perpendicular to the first direction. The third gap 103 includes a first central region 1032 and a first edge region 1031. The first central region 1032 is formed between the first step portion 113 and the third step portion 133, and the first edge region 1031 is near the side of the electrode assembly body 100 along the second direction. The dimension of the first central region 1032 along the third direction is larger than the dimension of the first edge region 1031 along the third direction. The second segment 120 and the fourth segment 140 are respectively provided with a second step portion 123 and a fourth step portion 143 at the center of the cross-section of the electrode assembly body 100 perpendicular to the first direction. The fourth gap 104 includes a second central region 1042 and a second edge region 1041. The second central region 1042 is formed between the second step portion 123 and the fourth step portion 143. The second edge region 1041 is located on the other side of the pole assembly body 100 along the second direction. The dimension of the second central region 1042 along the third direction is larger than the dimension of the second edge region 1041 along the third direction.

[0029] See also Figure 6 , Figure 7 and Figures 12-13 In this embodiment, the first cooling plate 210 includes two solid plate portions 211 and a hollow plate portion 212. The two solid plate portions 211 are distributed on both sides of the hollow plate portion 212 along the second direction. One solid plate portion 211 is connected to the first cooling bracket 230, and the other solid plate portion 211 is connected to the second cooling bracket 240. The middle portion of the hollow plate portion 212 along the second direction intersects perpendicularly with the middle portion of the second cooling plate 220 along the third direction. The cavity formed inside the hollow plate portion 212 communicates with the cavity formed inside the second cooling plate 220. Part of the hollow plate portion 212 is located in the first central region 1032 between the first segment 110 and the third segment 130, and the remaining portion of the hollow plate portion 212 is located in the second central region 1042 between the second segment 120 and the fourth segment 140. The two solid plate portions 211 are located in the first edge region 1031 and the second edge region 1041, respectively. The second cooling plate 220 is partially sandwiched in the first gap 101 between the first part 110 and the second part 120, and the remaining part of the second cooling plate 220 is sandwiched in the second gap 102 between the third part 130 and the fourth part 140.

[0030] Furthermore, in the first cooling plate 210, the hollow plate body 212 extends from one end along the first direction toward the direction close to the first cooling bracket 230 to form a first connecting part 213. The first connecting part 213 connects the cavity inside the hollow plate body 212 with the liquid inlet channel. The hollow plate body 212 extends from the same end along the first direction toward the direction close to the second cooling bracket 240 to form a second connecting part 214. The second connecting part 214 connects the cavity inside the hollow plate body 212 with the liquid outlet channel. Both the first connecting part 213 and the second connecting part 214 extend along the second direction.

[0031] See also Figure 9 The first part 110 has a first clearance step 115 opposite to the first connecting part 213, and the second part 120 has a second clearance step 125 opposite to the second connecting part 214. The first clearance step 115 and the second clearance step 125 provide arrangement space for the first connecting part 213 and the second connecting part 214 in the cooling assembly 200, and also limit the relative position of the cooling assembly 200 and the cell electrode group during assembly. The accurate positioning between the cell electrode group and the cooling assembly 200 is beneficial to improving the assembly yield.

[0032] See also Figure 3 and Figure 6 Along the second direction, in this embodiment, the distance between the opposite sides of the first central region 1032 and the second central region 1042 is W, and the width of the electrode assembly body 100 along the second direction is A1. The relationship between W and A1 satisfies: 0.3 ≤ W / A1 ≤ 0.5. For example, the value of W / A1 can be 0.3, 0.35, 0.4, 0.45, or 0.5, etc. By limiting the value of W / A1 to the above range, the contact area between the hollow plate body 212 in the first cooling plate 210 and the central region of the electrode assembly body 100 is larger, which is beneficial to improving the cooling rate of the battery cell electrode assembly and achieving good thermal management effect. If the W / A1 value is too small, the proportion of the first central region 1032 and the second central region 1042 in the width direction (i.e., the second direction) of the electrode assembly body 100 is insufficient, the contact area between the hollow plate body 212 and the central region of the electrode assembly body 100 is small, which is not conducive to improving the cooling and heat dissipation performance of the cell electrode assembly. The cooling effect in the middle of the electrode assembly body 100 is poor, and the heat dissipation performance is reduced. If the W / A1 value is too large, the proportion of the first central region 1032 and the second central region 1042 in the width direction (i.e., the second direction) of the electrode assembly body 100 is too large, the space occupied by the hollow plate body 212 is large, the arrangement space in the corresponding position in the electrode assembly body 100 is reduced, the size of the cell electrode assembly is limited, and the capacity increase of the cell is reduced.

[0033] See also Figure 4 and Figure 6In this embodiment, the first segment 110 has a first protrusion 111 on the side opposite to the third segment 130 along a third direction, and the second segment 120 has a second protrusion 121 on the side opposite to the fourth segment 140 along a third direction. The first protrusion 111 and the second protrusion 121 are arranged side by side along a second direction and separated by a first gap 101. The third segment 130 has a third protrusion 131 on the side opposite to the first segment 110 along a third direction, and the fourth segment 140 has a fourth protrusion 141 on the side opposite to the second segment 120 along a third direction. The third protrusion 131 and the fourth protrusion 141 are arranged side by side along a second direction and separated by a second gap 102. By setting the first protrusion 111, the second protrusion 121, the third protrusion 131 and the fourth protrusion 141, the volume of the electrode assembly body 100 is increased, which is beneficial to increasing the capacity of the battery cell.

[0034] Optionally, in this embodiment, the first part 110, the second part 120, the third part 130 and the fourth part 140 have the same overall design dimensions, and the first boss 111, the second boss 121, the third boss 131 and the fourth boss 141 also have the same overall design dimensions.

[0035] The following example illustrates the design dimensions of the first component 110 and the first protrusion 111. Along the second direction, the width of the first protrusion 111 is L1, and the width of the first component 110 is A2. The relationship between L1 and A2 satisfies: 0.5 ≤ L1 / A2 ≤ 0.8. For example, the value of L1 / A2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, or 0.8, etc. By limiting the value of L1 / A2 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 improvement in the battery cell's capacity. Otherwise, if the value of L1 / A2 is too small, the width of the first protrusion 111 will be insufficient, leading to a limited increase in the volume of the electrode assembly body 100 and an insignificant improvement in the battery cell's capacity. If the value of L1 / A2 is too large, it increases the molding difficulty of the positions in the battery cell housing 300 and the battery cell cover plate 400 that mate with the first protrusion 111, thus increasing costs.

[0036] The first sub-body 110 has two fifth protrusions 112 symmetrically arranged at its two ends along the first direction; the second sub-body 120 has two sixth protrusions 122 symmetrically arranged at its two ends along the first direction; the third sub-body 130 has two seventh protrusions 132 symmetrically arranged at its two ends along the first direction; and the fourth sub-body 140 has two eighth protrusions 142 symmetrically arranged at its two ends along the first direction. The fifth protrusions 112 and sixth protrusions 122 located at the same end of the electrode assembly body 100 are arranged side-by-side along the second direction and separated by a first gap 101. The seventh protrusions 132 and eighth protrusions 142 located at the same end of the electrode assembly body 100 are arranged side-by-side along the second direction and separated by a second gap 102. The fifth protrusions 112 and seventh protrusions 132 located at the same end of the electrode assembly body 100 are stacked along a third direction and separated by a third gap 103. The sixth protrusions 122 and eighth protrusions 142 located at the same end of the electrode assembly body 100 are stacked along a third direction and separated by a fourth gap 104. The fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132, and the eighth protrusion 142 further increase the volume of the electrode assembly body 100, which is beneficial to increasing the capacity of the battery cell. At the same time, when the fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132, and the eighth protrusion 142 are assembled with the battery cell cover plate 400, they can also play a positioning role, which helps to improve the positioning accuracy between the two, so that the electrode assembly body 100 is not easily damaged when the battery cell cover plate 400 presses the electrode assembly body 100 into the casing.

[0037] See also Figure 2 Along the second direction, the width of the fifth protrusion 112 is L2, and the width of the first segment 110 is A2. The relationship between L2 and A2 satisfies: 0.5 ≤ L2 / A2 ≤ 0.85. For example, the value of L2 / A2 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, or 0.85, etc. By limiting the value of L2 / A2 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 L2 / A2 is too small, the width of the fifth protrusion 112 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 L2 / A2 is too large, it will increase the molding difficulty of the position in the cell cover plate 400 that mates with the fifth protrusion 112, thus increasing costs. Optionally, in this embodiment, the overall design dimensions of the fifth boss 112, the sixth boss 122, the seventh boss 132, and the eighth boss 142 are also the same.

[0038] See also Figure 7 and Figure 8Along the third direction, the heights of the first edge region 1031 and the second edge region 1041 are both T. The distance between the end faces of the fifth protrusion 112 and the seventh protrusion 132 on opposite sides along the third direction is F. The distance between the end faces of the sixth protrusion 122 and the eighth protrusion 142 on opposite sides along the third direction is also F. The thickness of the electrode assembly body 100 is B1 (that is, the distance between the end faces of the first protrusion 111 and the third protrusion 131 on opposite sides along the third direction is B1). The relationship between F, T, and B1 satisfies: 0.3 ≤ (FT) / B1 ≤ 0.65. For example, the value of (FT) / B1 can be 0.3, 0.4, 0.5, 0.6, or 0.65, etc. By limiting the value of (FT) / B1 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 increase in cell capacity. Otherwise, if the value of (FT) / B1 is too small, the dimensions of the fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132, and the eighth protrusion 142 along the third direction will be small, the volume increase of the electrode assembly body 100 will be limited, and the capacity increase of the battery cell will not be obvious. If the value of (FT) / B1 is too large, the molding difficulty of the positions in the battery cell cover plate 400 that mate with the fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132, and the eighth protrusion 142 will increase, and the cost will rise.

[0039] Optionally, the value of T ranges from 1.5mm to 4mm. For example, the value of T can be 1.5mm, 2mm, 3mm, or 4mm, etc. The value of B1 ranges from 150mm to 550mm. For example, the value of B1 can be 150mm, 200mm, 300mm, 400mm, 500mm, or 550mm, etc. The value of F can be calculated based on the value of (FT) / B1.

[0040] Furthermore, along a third direction, the distance between the end faces of the first segment 110 and the third segment 130 that are opposite to each other is B2, and the distance between the end faces of the second segment 120 and the fourth segment 140 that are opposite to each other is also B2. The relationship between B1 and B2 satisfies: 16mm ≤ B1 - B2 ≤ 60mm. For example, the value of B1 - B2 can be 16mm, 18mm, 20mm, 30mm, 40mm, 50mm, or 60mm, etc. By limiting the value of B1 - B2 to the above range, the dimensions of the first boss 111, the second boss 121, the third boss 131, and the fourth boss 141 protruding from the end face of the electrode assembly body 100 will not be too large. The cell housing 300 that mates with this position is easy to process and form, and the volume of the cell electrode assembly is effectively increased, resulting in a significant increase in the capacity of the cell. If the value of B1-B2 is too small, the volume of the cell electrode assembly will increase less, and the capacity improvement effect of the cell will not be obvious. If the value of B1-B2 is too large, the cell housing 300 at the mating position with the first boss 111, the second boss 121, the third boss 131 and the fourth boss 141 will be difficult to process and form, the product yield will decrease, and the structural strength of the formed cell housing 300 will decrease, making it prone to deformation and reducing reliability.

[0041] See also Figure 2 The first component 110 has a fifth protrusion 112 at both ends along the first direction. The distance between the two fifth protrusions 112 facing away from each other along the first direction is E, and the value of E is in the range of 300mm ≤ E ≤ 1000mm. For example, the value of E can be 300mm, 500mm, 800mm, or 1000mm, etc. The length of the fifth protrusion 112 along the first direction is H, and the value of H is in the range of 10mm ≤ H ≤ 50mm. For example, the value of H can be 10mm, 20mm, 30mm, 40mm, or 50mm, etc. By limiting the values ​​of E and H to the above ranges, the capacity of the cell electrode assembly is significantly improved. Optionally, the sixth protrusion 122, the seventh protrusion 132, and the eighth protrusion 142 have the same dimensions along the first direction as the fifth protrusion 112, which are also all H.

[0042] Furthermore, at the end of the electrode assembly body 100 along its length (i.e., the first direction), the first split 110 and the second split 120 are respectively provided with a first guide surface 114 and a second guide surface 124 on opposite sides along the second direction. The first guide surface 114 and the second guide surface 124 provide guidance when the electrode assembly is inserted into the casing, facilitating assembly of the electrode assembly with the casing 300. The orientation during insertion is accurate, and the positioning effect is good. Optionally, the included angle between the first guide surface 114 and the second guide surface 124 is N, and the value of N is in the range of 50°≤N≤120°. For example, the value of N can be 50°, 60°, 70°, 80°, 100°, 110°, or 120°, etc. By limiting the value of N to the above range, the electrode assembly has a good guiding effect when inserted into the casing, resulting in a high assembly yield.

[0043] Of course, the third component 130 and the fourth component 140 are respectively provided with a third guide surface and a fourth guide surface on the side opposite to each other along the second direction, and the included angle between the third guide surface and the fourth guide surface is also N. The third guide surface and the fourth guide surface can provide guidance when the cell electrode assembly is inserted into the casing, which facilitates the assembly of the cell electrode assembly and the cell casing 300. The orientation during insertion into the casing is accurate and the positioning effect is good.

[0044] This embodiment also provides a battery cell, see [link to example]. Figures 15-18 The battery cell includes the aforementioned cell electrode assembly and a cooling assembly 200. The cooling assembly 200 includes a first cooling plate 210 and a second cooling plate 220 extending along a first direction. The first cooling plate 210 and the second cooling plate 220 are cross-shaped in a cross section perpendicular to the first direction. The first cooling plate 210 and the second cooling plate 220 have cavities for coolant flow. The first cooling plate 210 is sandwiched within a third gap 103 and a fourth gap 104, and the second cooling plate 220 is sandwiched within a first gap 101 and a second gap 102. The cooling assembly 200 is used to cool and reduce the temperature of the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140 of the cell electrode assembly. The cooling assembly 200 can cool and reduce the temperature of the central area of ​​the cell electrode assembly, resulting in good heat dissipation performance of the cell electrode assembly.

[0045] Furthermore, the battery cell also includes a cell cover plate 400 and a cell housing 300. The cell housing 300 has two openings 301 at both ends along the first direction. Two cell cover plates 400 are provided, and each opening 301 is 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 assembly efficiency for the battery cell.

[0046] Specifically, see [link to relevant documentation] Figure 17 In this embodiment, the battery cell housing 300 includes two first end plates 310 facing each other along a second direction, and two second end plates 320 facing each other along a third 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 first end plates 310 are provided with a first mating protrusion 311, and the second end plates 320 are provided with a second mating protrusion 321. The cooling assembly 200 is installed in the accommodating cavity. The first cooling plate 210 is connected to the first cooling bracket 230 and the second cooling bracket 240 at its two ends along the second direction (i.e., the width direction of the first cooling plate 210). The first cooling bracket 230 and the second cooling bracket 240 are respectively located in the first mating protrusions 311 on the two first end plates 310 of the cell housing 300. The first mating protrusions 311 restrict the position of the first cooling bracket 230 and the second cooling bracket 240, preventing the first cooling plate 210 from swaying up and down along the third direction and from moving left and right along the second direction. The cooling assembly 200 is well positioned in the cell housing 300.

[0047] The two ends of the second cooling plate 220 along a third direction (i.e., the width direction of the second cooling plate 220) respectively abut against the second mating protrusion 321 on a second end plate 320. Thus, the cooling assembly 200 divides the accommodating cavity into four relatively independent chambers. The first component 110, second component 120, third component 130, and fourth component 140 of the battery cell electrode assembly are respectively installed in one chamber, with the first protrusion 111, second protrusion 121, third protrusion 131, and fourth protrusion 141 housed at the second mating protrusion 321. The first cooling plate 210 provides effective support for the midpoint of the two first end plates 310 along a third direction, and the second cooling plate 220 provides effective support for the midpoint of the second end plate 320 along a second direction, thereby protecting the battery cell electrode assembly from damage. Simultaneously, it provides good positioning for the battery cell electrode assembly, ensuring that the battery cell electrode assembly is not prone to shaking or displacement after assembly with the battery cell housing 300.

[0048] Furthermore, the first mating protrusion 311 is provided with a through hole 3111 corresponding to the inlet 231 on the first cooling bracket 230 and the outlet 241 on the second cooling bracket 240. The through hole 3111, the inlet 231, and the outlet 241 are all circular holes, and the diameter of the through hole 3111 is not less than the diameter of the inlet 231 and the outlet 241. The inlet 231 and the outlet 241 are connected to an external coolant circulation pipeline, and both the inlet 231 and the outlet 241 are sealed to the coolant circulation pipeline, thereby allowing coolant to be smoothly injected into the cooling assembly 200.

[0049] On the inner wall surface of one end of the first mating boss 311 in the first end plate 310 along one end of the first direction, a limiting plate 3112 is provided. The cooling assembly 200 can be inserted from the side of the battery cell housing 300 where the limiting plate 3112 is not provided. When the first cooling plate 210 abuts against the limiting plate 3112 along the first direction, it indicates that the cooling assembly 200 is installed in place. At this time, the center of the through hole 3111 on the first mating boss 311 is coaxial with the center of the inlet 231 / outlet 241. Through the cooperation between the limiting plate 3112 and the first cooling plate 210, the position of the cooling assembly 200 in the battery cell housing 300 is determined, and the assembly accuracy is relatively high.

[0050] At both ends of the battery cell housing 300 along the first direction, flanges 322 are further provided. The two sides of the flange 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, the second guiding surface 124, the third guiding surface or the fourth guiding surface in the battery cell electrode group. Through the setting of the flanges 322, the volume of the accommodation cavity in the battery cell housing 300 is further increased, which is beneficial to increasing the capacity of the battery cell.

[0051] Continue to refer to Figure 18 In this embodiment, the battery cell cover plate 400 includes a cover plate body 410, a first plastic part 420, a second plastic part, a connecting member 430 and a pole 440. Among them, the second plastic part, the cover plate body 410, the first plastic part 420 and the connecting member 430 are stacked in sequence along the first direction. The first plastic part 420 insulates the connecting member 430 from the cover plate body 410, and the second plastic part insulates the cover plate body 410 from the battery cell electrode group. A protective boss 411 is provided on the cover plate body 410. The second plastic part, the cover plate body 410, the first plastic part 420 and the connecting member 430 are in a "square frame" shape. The protective boss 411 passes through the through holes in the middle of the second plastic part, the cover plate body 410, the first plastic part 420 and the connecting member 430. A accommodation space is formed inside the protective boss 411. The fifth boss 112, the sixth boss 122, the seventh boss 132 and the eighth boss 142 of the battery cell electrode group are installed in the accommodation space. Through the cooperation between the protective boss 411 and the fifth boss 112, the sixth boss 122, the seventh boss 132 and the eighth boss 142, 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 accommodation cavity.

[0052] Continue to refer to Figure 1 and Figure 18Each of the first segment 110, the second segment 120, the third segment 130, and the fourth segment 140 has tabs 150 on both opposite end faces along the first direction, meaning there are a total of eight tabs 150. The electrode group body 100 has four tabs 150 at each end along the first direction. The tabs 150 are L-shaped and extend to the first guide surface 114, the second guide surface 124, the third guide surface, and the fourth guide surface, respectively. Each cell cover plate 400 has four posts 440. The four posts 440 are divided into two groups and set on both sides of the protective protrusion 411. Each post 440 is located at one corner of the cell cover plate 400. The post 440 passes through the second plastic part, the cover plate body 410, the first plastic part 420, and the connector 430. One end of each post 440 is connected to a corresponding tab 150, and the other end of each post 440 is connected to the connector 430. The connector 430 is used to connect to the busbar of series / parallel battery cells. Since the terminal post 440 is located on the side of the protective protrusion 411, and the end faces of both the terminal post 440 and the connector 430 on the side away from the battery cell assembly are lower than the protective protrusion 411 along the first direction, it provides good protection for the connector 430 and the terminal post 440, preventing damage during the manufacturing process, improving the safety performance of the battery cell, and resulting in a good appearance. Furthermore, after the battery 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.

[0053] 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.

[0054] Table 1 As can be seen from the above results, the value ranges of parameters H, B1-B2, (FT) / B1, L1 / A2, W / A1, L2 / A2, E, N, and T 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 battery cell electrode assembly 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 battery cell electrode assembly. The operating temperature of the battery cell electrode assembly is suitable, and its performance is good. The battery cell electrode assembly product is of good quality.

[0055] In Comparative Example 1, the value of parameter (FT) / B1 is less than the minimum value of 0.3≤(FT) / B1≤0.65. At this time, the volume of the fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132 and the eighth protrusion 142 are small, the capacity improvement effect of the cell is not obvious, and the cell electrode group product is defective.

[0056] In Comparative Example 2, the value of parameter (FT) / B1 is greater than the maximum value of 0.3≤(FT) / B1≤0.65. At this time, the molding difficulty of the positions of the cell cover plate 400 that mate with the fifth protrusion 112, the sixth protrusion 122, the seventh protrusion 132 and the eighth protrusion 142 increases, the cost increases, and the cell electrode assembly product is defective.

[0057] In Comparative Example 3, the value of parameter W / A1 is less than the minimum value of 0.3 ≤ W / A1 ≤ 0.5. At this time, the proportion of the first central area 1032 and the second central area 1042 in the width direction (i.e., the second direction) of the electrode assembly body 100 is insufficient, the contact area between the hollow plate body 212 and the central area of ​​the electrode assembly body 100 is small, the cooling effect in the middle of the electrode assembly body 100 is poor, the heat dissipation performance is reduced, and the cell electrode assembly product is defective.

[0058] In Comparative Example 4, the value of parameter W / A1 is greater than the maximum value of 0.3 ≤ W / A1 ≤ 0.5. At this time, the proportion of the first central area 1032 and the second central area 1042 in the width direction (i.e., the second direction) of the electrode assembly body 100 is too large, the space occupied by the hollow plate body 212 is large, the arrangement space at the corresponding position in the electrode assembly body 100 is reduced, the volume increase of the cell electrode assembly is small, the capacity increase of the cell is low, and the cell electrode assembly product is defective.

[0059] In Comparative Example 5, the value of parameter T is less than the minimum value of 1.5mm ≤ T ≤ 4mm. At this time, the height of the first edge region 1031 and the second edge region 1041 is small, the thickness of the solid plate body 211 of the first cooling plate 210 is thin, its mechanical strength is low, and it is prone to deformation. The support effect of the cooling component 200 on the electrode group body 100 is reduced, the reliability is reduced, and the cooling component 200 is prone to scratching the electrode group body 100 during assembly, which can easily damage the electrode group body 100 and result in defective cell electrode group products.

[0060] In Comparative Example 6, the value of parameter T is greater than the maximum value of 1.5mm ≤ T ≤ 4mm. At this time, the height of the first edge region 1031 and the second edge region 1041 is too large, the thickness of the solid plate body 211 of the first cooling plate 210 is too thick, occupying a large space, reducing the arrangement space of the electrode assembly body 100, which is not conducive to increasing the capacity of the battery cell, and also increases the weight and cost of the battery cell, resulting in defective battery cell electrode assembly products.

[0061] Taking all factors into consideration, when the dimensions of the cell electrode assembly meet the above requirements, a high yield rate for the assembly of the cell electrode assembly and the cell housing 300 can be guaranteed, and the positioning of the cell electrode assembly within the cell housing 300 is accurate. After assembly, neither the cell electrode assembly nor the cell housing 300 shows deformation or damage. The volume of the cell electrode assembly is significantly increased, resulting in a larger cell capacity that meets the needs of high energy storage. The operating temperature of the cell electrode assembly is suitable, and its performance is excellent.

[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, include: The electrode assembly body includes a first part, a second part, a third part, and a fourth part. The first part, the second part, the third part, and the fourth part all extend along a first direction. The first part and the second part are arranged side by side along a second direction and separated by a first gap. The third part and the fourth part are arranged side by side along the second direction and separated by a second gap. The third part and the first part are stacked along a third direction and separated by a third gap. The fourth part and the second part are stacked along a third direction and separated by a fourth gap. The first gap, the second gap, the third gap, and the fourth gap converge and connect at the center of the cross-section of the electrode assembly body perpendicular to the first direction to form a heat dissipation space.

2. The cell electrode assembly according to claim 1, characterized in that, The first part is provided with a first protrusion on the side away from the third part along the third direction, and the second part is provided with a second protrusion on the side away from the fourth part along the third direction. The first protrusion and the second protrusion are arranged side by side along the second direction and separated by the first gap. The third component has a third protrusion on the side opposite to the first component along the third direction, and the fourth component has a fourth protrusion on the side opposite to the second component along the third direction. The third protrusion and the fourth protrusion are arranged side by side along the second direction and separated by the second gap.

3. The cell electrode assembly according to claim 2, characterized in that, Along the second direction, the width of the first boss is L1, and the width of the first split part is A2; The relationship between L1 and A2 satisfies: 0.5≤L1 / A2≤0.

8.

4. The cell electrode assembly according to claim 3, characterized in that, The first component and the third component are respectively provided with a first step portion and a third step portion at the center of the cross section perpendicular to the first direction near the main body of the pole assembly; the third gap includes a first central area and a first edge area, the first central area is formed between the first step portion and the third step portion, and the first edge area is near the side of the main body of the pole assembly along the second direction; the dimension of the first central area along the third direction is larger than the dimension of the first edge area along the third direction. The second and fourth components are respectively provided with a second step portion and a fourth step portion at the center of the cross section perpendicular to the first direction near the main body of the pole assembly; the fourth gap includes a second central region and a second edge region, the second central region is formed between the second step portion and the fourth step portion, and the second edge region is near the other side of the main body of the pole assembly along the second direction; the size of the second central region along the third direction is larger than the size of the second edge region along the third direction; Along the second direction, the distance between the opposite sides of the first central region and the second central region is W, and the width of the pole group body along the second direction is A1; The relationship between W and A1 satisfies: 0.3≤W / A1≤0.

5.

5. The cell electrode assembly according to claim 4, characterized in that, The first part has a fifth protrusion at its end along the first direction, the second part has a sixth protrusion at its end along the first direction, the third part has a seventh protrusion at its end along the first direction, and the fourth part has an eighth protrusion at its end along the first direction. The fifth protrusion and the sixth protrusion are arranged side by side along the second direction and separated by a first gap. The seventh protrusion and the eighth protrusion are arranged side by side along the second direction and separated by a second gap. The fifth protrusion and the seventh protrusion are stacked along the third direction and separated by a third gap. The sixth protrusion and the eighth protrusion are stacked along the third direction and separated by a fourth gap. Along the second direction, the width of the fifth boss is L2; The relationship between L2 and A2 satisfies: 0.5≤L2 / A2≤0.

85.

6. The cell electrode assembly according to claim 5, characterized in that, Along the third direction, the height of the first edge region is T, the distance between the end faces of the fifth protrusion and the seventh protrusion on opposite sides along the third direction is F, and the thickness of the pole group body is B1. The relationship between F, T, and B1 satisfies: 0.3 ≤ (FT) / B1 ≤ 0.65; The value of T is in the range of 1.5mm ≤ T ≤ 4mm; The value range of B1 is: 150mm≤B1≤550mm.

7. The cell electrode assembly according to claim 6, characterized in that, Along the third direction, the distance between the end faces of the first split body and the third split body that are opposite to each other is B2; The relationship between B1 and B2 satisfies: 16mm≤B1-B2≤60mm.

8. The cell electrode assembly according to claim 6, characterized in that, The first split body has a fifth protrusion at both ends along the first direction, and the distance between the two fifth protrusions on opposite sides along the first direction is E; The value range of E is: 300mm≤E≤1000mm; The length of the fifth protrusion along the first direction is H; The value range of H is: 10mm≤H≤50mm.

9. The cell electrode assembly according to claim 1, characterized in that, Along the second direction, the first split body and the second split body are respectively provided with a first guide surface and a second guide surface on the opposite sides of each other, and the included angle between the first guide surface and the second guide surface is N; The range of N is: 50°≤N≤120°.

10. A battery cell, characterized in that, The battery cell electrode assembly and cooling assembly according to any one of claims 1-9 are included. The cooling assembly includes a first cooling plate and a second cooling plate extending along a first direction. The first cooling plate and the second cooling plate are cross-shaped in a cross section perpendicular to the first direction. The first cooling plate and the second cooling plate have cavities for coolant flow. The first cooling plate is sandwiched in a third gap and a fourth gap of the battery cell electrode assembly. The second cooling plate is sandwiched in a first gap and a second gap of the battery cell electrode assembly. The cooling assembly is used to cool and reduce the temperature of the first, second, third, and fourth parts of the battery cell electrode assembly.

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