Battery cell housing and battery cell

Abstract

The application belongs to the technical field of batteries, and specifically discloses a battery cell shell and a battery cell. The battery cell shell comprises a shell body and a cooling piece. The shell body is surrounded by two first end plates and two second end plates to form a containing cavity. Each first end plate is provided with a mounting portion on the inner wall facing the containing cavity. The cooling piece is arranged in the shell body. The two ends of the cooling piece along a second direction are respectively connected to the mounting portions on one first end plate. The cooling piece has a cavity for the circulation of a cooling medium. The cooling piece can accurately position and support the battery cell pole group, avoid the deformation of the battery cell shell to crush the battery cell pole group, and the cooling medium in the cooling piece can exchange heat with the battery cell pole group to quickly cool the central region of the battery cell pole group, thereby achieving good heat dissipation effect. The application also provides a battery cell comprising the above battery cell shell.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and more particularly to a cell housing and a cell. Background Technology

[0002] With the increasing maturity of lithium-ion battery technology, lithium-ion batteries are widely used as power batteries in electric vehicles and energy storage, leading to increasingly stringent requirements for their capacity and safety. Among these, the battery cell is the core component of a lithium-ion battery, and its structural design is crucial to its safety.

[0003] Currently, the end faces of existing battery cell casings are generally designed as planar structures, which cannot match the shapes of some specially designed battery cell electrode assemblies, resulting in low space utilization and low cell capacity and assembly ratio. Furthermore, after the battery cell electrode assemblies are installed in the casing, there may be issues with poor positioning, leading to shaking or displacement and a decrease in assembly yield. Moreover, due to the lack of support at the end faces of the battery cell casing, the casing is easily deformed upon impact, potentially damaging the battery cell electrode assemblies and causing irreversible damage. Additionally, the heat dissipation at the center of the battery cell electrode assembly is poor, easily leading to heat concentration and affecting the performance of the battery cell. Summary of the Invention

[0004] The purpose of this invention is to provide a battery cell housing and a battery cell, which can accurately position and support the battery cell electrode assembly, prevent the battery cell housing from deforming and damaging the battery cell electrode assembly, and assist in heat dissipation at the center of the battery cell electrode assembly, resulting in good thermal management.

[0005] To achieve this objective, the present invention adopts the following technical solution: On one hand, the present invention provides a battery cell housing, comprising: The housing body includes two first end plates and two second end plates extending along a first direction. The two first end plates are opposite each other along a second direction, and the two second end plates are opposite each other along a third direction. The two first end plates and the two second end plates form an accommodating cavity. Each first end plate has a mounting portion on its inner wall facing the accommodating cavity, and the mounting portion has a through hole on one side along the first direction. A cooling component is disposed within the housing body. The two ends of the cooling component along the second direction are respectively connected to the mounting portion on a first end plate. The cooling component has a cavity for the flow of cooling medium. The cooling component includes an inlet and an outlet communicating with the cavity. The inlet and the outlet are respectively opposite to the through hole on a first end plate.

[0006] Optionally, the mounting portion includes a first support bar and a second support bar, the first support bar and the second support bar being spaced apart along a third direction, and a slot being formed between the first support bar and the second support bar, with the cooling component inserted into one of the slots at both ends along a second direction; the depth of the slot along the second direction is H; The value of H is in the range of 0.8mm ≤ H ≤ 1.5mm.

[0007] Optionally, the cooling component includes two solid plate portions and a hollow plate portion. The two solid plate portions are distributed on both sides of the hollow plate portion along the second direction and are respectively connected to one of the slots. The hollow plate portion forms the cavity. The cooling component further includes a first bracket and a second bracket. The first bracket and the second bracket are located at the ends of the solid plate portion along the first direction, and the first bracket and the second bracket are respectively disposed on both sides of the hollow plate portion along the second direction. A liquid inlet channel is formed in the first bracket, and a liquid outlet channel is formed in the second bracket. Both the liquid inlet channel and the liquid outlet channel are in communication with the cavity. The liquid inlet is provided on the side of the first bracket away from the hollow plate portion along the second direction, and the liquid outlet is provided on the side of the second bracket away from the hollow plate portion along the second direction.

[0008] Optionally, along the second direction, the width of the hollow plate portion is W2, and the width of the shell body is A; The relationship between W2 and A satisfies: 0.2≤W2 / A≤0.35.

[0009] Optionally, along a third direction, the thickness of the solid plate portion is T1, and the wall thickness of the hollow plate portion is T2; the total thickness of the hollow plate portion along a third direction is M. The relationship between M and T2 satisfies: 1.2mm ≤ M-2×T2 ≤ 4.5mm; The value range of T1 is: 0.8mm≤T1≤3.5mm.

[0010] Optionally, each of the second end plates is provided with a mating protrusion, the mating protrusion extending along a first direction; Along the second direction, the width of the mating convex hull is W1, and the width of the housing body is A; The relationship between W1 and A satisfies: 0.5 ≤ W1 / A ≤ 0.75; And / or, along a third direction, the distance between the end faces of the two second end plates that are opposite to each other is B1, and the distance between the end faces of the two mating convex buds that are opposite to each other is B2. The relationship between B1 and B2 satisfies: 16mm≤B2-B1≤60mm.

[0011] Optionally, both ends of the second end plate extend outward along the first direction to form flanges, and the flanges are connected to the side of the second end plate along the first direction through an inclined portion. Along the second direction, the width of the flange at the end furthest from the second end plate is W3; The relationship between W1 and W3 satisfies: 6mm≤W3-W1≤20mm.

[0012] Optionally, along the first direction, the distance between the end of the cooling element having the liquid inlet and / or the liquid outlet and the adjacent side of the first end plate is L; The value of L is in the range of 5.5mm≤L≤15mm.

[0013] Optionally, the through hole is rectangular, the length of the through hole along the first direction is K, and the width of the through hole along the third direction is F; The relationship between K and F satisfies: 12mm 2 ≤K×F≤80mm 2 .

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

[0015] The beneficial effects of this invention are as follows: This invention provides a battery cell housing, comprising a housing body and a cooling component. The housing body is formed by two first end plates and two second end plates, creating a receiving cavity. Each first end plate has a mounting portion on its inner wall facing the receiving cavity, and the mounting portion has a through hole on one side along a first direction. The cooling component is disposed within the housing body, with its two ends along a second direction respectively connected to the mounting portion on one of the first end plates. The cooling component has a cavity for the flow of a cooling medium, and includes an inlet and an outlet communicating with the cavity. The inlet and outlet are respectively aligned with the through hole on one of the first end plates. The cooling component can precisely position and support the battery cell electrode assembly, preventing deformation of the battery cell housing and damage to the battery cell electrode assembly. Furthermore, the cooling medium within the cooling component can exchange heat with the battery cell electrode assembly, enabling rapid cooling of the central area of ​​the battery cell electrode assembly within the receiving cavity, resulting in excellent heat dissipation.

[0016] The present invention also provides a battery cell, including the aforementioned battery cell housing. It can precisely position and support the battery cell electrode assembly, preventing deformation of the battery cell housing that could damage the battery cell electrode assembly, and can also assist in heat dissipation of the battery cell electrode assembly, resulting in good thermal management. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 2 This is a top view of the battery cell housing provided in an embodiment of the present invention; Figure 3 yes Figure 2 Sectional view of section I-I; Figure 4 yes Figure 3 Enlarged view of a section at point II; Figure 5 yes Figure 2 Sectional view of section III-III; Figure 6 yes Figure 5 Enlarged view of a section at point IV; Figure 7 This is a front view of the battery cell housing provided in an embodiment of the present invention; Figure 8 yes Figure 7 A magnified view of section V; Figure 9 This is an exploded view of the battery cell casing provided in an embodiment of the present invention; Figure 10 yes Figure 9 A magnified view of a section at point VI; Figure 11 This is a top view of the cooling component provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 13 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 14 This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 15 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention.

[0018] In the picture: 100. Housing body; 101. Opening; 110. First end plate; 111. Mounting part; 1111. First support bar; 1112. Second support bar; 1113. Slot; 112. Through hole; 120. Second end plate; 121. Mating protrusion; 122. Flange; 1221. Inclined part; 200. Cooling component; 210. Solid plate body; 220. Hollow plate body; 221. Cavity; 230. First support; 231, liquid inlet; 240, second support; 241, liquid outlet; 300, cell electrode assembly; 310, first component; 311, first boss; 312, second boss; 313, electrode tab; 314, guide slope; 320, second component; 400, cell cover plate; 410, cover plate body; 411, protective protrusion; 420, first insulating component; 430, connector; 440, electrode 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] Example 1 like Figure 1 ,as well as Figures 12-15As shown, this embodiment provides a battery cell housing, which, when assembled with the battery cell electrode assembly 300 and the battery cell cover plate 400, forms a battery cell. This battery cell housing can accommodate irregularly shaped battery cell electrode assemblies 300 and battery cell cover plates 400. Through a special structural design, the battery cell housing increases the assembly space for the battery cell electrode assembly 300, thereby improving the energy density of the battery cell and resulting in a high assembly ratio. Furthermore, the battery cell electrode assembly 300 experiences balanced forces when inserted into the housing, ensuring good positioning within the housing and reducing the risk of shaking, displacement, damage, or fragmentation. Simultaneously, the battery cell housing assists in heat dissipation at the center of the battery cell electrode assembly 300, resulting in uniform temperature throughout the assembly, excellent thermal management, and superior battery cell performance.

[0024] Specifically, see Figures 1-4 ,as well as Figure 9 and Figure 10 This embodiment provides a battery cell housing, which includes a housing body 100 and a cooling element 200. The housing body 100 has a cylindrical structure and includes two first end plates 110 and two second end plates 120 extending along a first direction. The two first end plates 110 are opposite each other along a second direction, and the two second end plates 120 are opposite each other along a third direction, forming an accommodating cavity. The 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. Each first end plate 110 has a mounting portion 111 on its inner wall facing the accommodating cavity. The cooling element 200 is plate-shaped and is disposed within the housing body 100. The two ends of the cooling element 200 along the second direction are respectively connected to the mounting portion 111 on one of the first end plates 110. The cooling element 200 has a cavity 221 for the flow of cooling medium. The cell electrode assembly 300 has a clearance space corresponding to the position of the cooling element 200, so that the cell electrode assembly 300 can be smoothly assembled with the cell housing. The cooling element 200 can provide effective support for the middle position of the first end plate 110 along the third direction, preventing the cell electrode assembly 300 from being squeezed by the deformation of the housing body 100 under pressure, thus providing good protection for the cell electrode assembly 300. Moreover, the cooling element 200 can also provide good positioning for the cell electrode assembly 300, preventing the cell electrode assembly 300 from shaking within the cell housing, ensuring that the cell electrode assembly 300 is fixed stably and reliably within the cell housing. Meanwhile, the two opposite end faces of the cooling component 200 along the third direction can exchange heat with the central area of ​​the cell electrode assembly 300, thereby quickly cooling the central area of ​​the cell electrode assembly 300. The temperature of the cell electrode assembly 300 is uniform throughout, the thermal management effect is good, and the performance of the cell is superior.

[0025] Furthermore, each first end plate 110 is provided with a through hole 112, located on one side of the mounting portion 111 along the first direction. The cooling element 200 has an inlet 231 and an outlet 241 communicating with the cavity 221 on both sides along the second direction. The inlet 231 and outlet 241 are respectively opposite to the through hole 112 on one of the first end plates 110. Thus, the cooling medium can enter the cavity 221 from the outside of the housing body 100 through the inlet 231, exchange heat with the cell electrode assembly 300 through the wall of the cooling element 200, and then flow out through the outlet 241, thereby removing heat from the central region of the cell electrode assembly 300 and achieving rapid cooling of the cell electrode assembly 300. Exemplarily, the cooling medium can be a cooling gas, such as air or nitrogen. In some embodiments, the cooling medium can also be a coolant, such as water or an ethanol solution.

[0026] See Figure 5 and Figure 6 Along the first direction, the distance between one end of the cooling component 200 with the liquid inlet 231 and / or liquid outlet 241 and the adjacent side of the first end plate 110 is L, and the value of L is in the range of 5.5mm ≤ L ≤ 15mm. For example, the value of L can be 5.5mm, 6.0mm, 8.0mm, 10mm, 12mm, or 15mm, etc. By limiting the value of L to the above range, the arrangement space of the cooling component 200 along the first direction is larger, and the length of the cavity 221 inside the cooling component 200 is larger, which can increase the contact area between the cooling component 200 and the cell electrode assembly 300, resulting in a good cooling effect on the cell electrode assembly 300. If the value of L is too small, the through hole 112 on the first end plate 110 that is directly opposite the liquid inlet 231 or the liquid outlet 241 will be too close to the adjacent side of the first end plate 110, which will reduce the mechanical strength of the first end plate 110 and cause deformation problems at the through hole 112, thus reducing the reliability of the housing body 100. If the value of L is too large, the length of the cooling component 200 along the first direction will be reduced, the length of the cavity 221 inside the cooling component 200 will be smaller, the contact area between the cooling component 200 and the cell electrode group 300 will be reduced, the cooling effect on the cell electrode group 300 will be reduced, and it will not be conducive to improving the heat dissipation effect of the cooling component 200 on the cell electrode group 300.

[0027] See Figure 7 and Figure 8In this embodiment, the through hole 112 on the first end plate 110 is rectangular, and correspondingly, the liquid inlet 231 and liquid outlet 241 on the cooling component 200 are also rectangular. The shapes of the liquid inlet 231 and liquid outlet 241 are consistent with the shape of the through hole 112, but the length and width dimensions of the liquid inlet 231 and liquid outlet 241 are not greater than the length and width dimensions of the through hole 112, thereby facilitating the connection of the liquid inlet 231 and liquid outlet 241 with the circulation pipeline of the cooling medium. Preferably, the length and width dimensions of the through hole 112 are slightly larger than the length and width dimensions of the liquid inlet 231 and liquid outlet 241, so as to facilitate the alignment of the liquid inlet 231 / liquid outlet 241 with the through hole 112.

[0028] Optionally, the length of the through hole 112 along the first direction is K, and the width of the through hole 112 along the third direction is F. The relationship between K and F satisfies: 12mm 2 ≤K×F≤80mm 2 The value of K×F is the cross-sectional area of ​​the through hole 112. For example, the value of K×F can be 12 mm. 2 15mm 2 20mm 2 30mm 2 40mm 2 50mm 2 60mm 2 70mm 2 Or 80mm 2 By limiting the value of K×F within the above range, the sizes of the inlet 231 and outlet 241 are made large enough to facilitate the flow of cooling medium into or out of the cooling component 200. At the same time, the through hole 112 has little impact on the mechanical strength of the first end plate 110, and the reliability of the housing body 100 is high, making it less prone to deformation problems.

[0029] See also Figure 3 , Figure 4 and Figure 10 In this embodiment, the mounting part 111 includes a first support bar 1111 and a second support bar 1112. The first support bar 1111 and the second support bar 1112 are spaced apart along a third direction, and a slot 1113 is formed between the first support bar 1111 and the second support bar 1112. The two ends of the cooling component 200 along the second direction are respectively inserted into one slot 1113. The slot 1113 provides a good guiding effect when the cooling component 200 is assembled with the housing body 100, allowing the cooling component 200 and the housing body 100 to be assembled smoothly.

[0030] Along the second direction, the depth of the slot 1113 is H, and the value of H ranges from 0.8mm ≤ H ≤ 1.5mm. For example, the value of H can be 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, or 1.5mm, etc. By limiting the value of H within the above range, the contact area between the cooling component 200 and the slot 1113 is larger, ensuring that the mounting part 111 has a good limiting effect on the cooling component 200, and the connection between the cooling component 200 and the housing body 100 is reliable. If the value of H is too small, the depth of the slot 1113 will be too small, the contact area between the cooling component 200 and the slot 1113 will be small, and the cooling component 200 will easily come out of the slot 1113 after it is connected with the mounting part 111, making the connection between the cooling component 200 and the housing body 100 unreliable. If the value of H is too large, it will occupy a large space inside the housing body 100, reducing the space utilization rate, and increasing the weight of the housing body 100, resulting in high cost.

[0031] See Figure 3 , Figure 9 and Figure 11 In this embodiment, the cooling component 200 includes two solid plate portions 210 and a hollow plate portion 220. The two solid plate portions 210 are distributed on both sides of the hollow plate portion 220 along the second direction and are respectively connected to a slot 1113. A cavity 221 is formed inside the hollow plate portion 220. The cooling component 200 also includes a first support 230 and a second support 240. The first support 230 and the second support 240 are located at the same end of the solid plate portion 210 along the first direction, and the first support 230 and the second support 240 are respectively disposed on both sides of the hollow plate portion 220 along the second direction. A liquid inlet channel is formed inside the first support 230, and a liquid outlet channel is formed inside the second support 240. Both the liquid inlet channel and the liquid outlet channel are connected to the cavity 221. The first support 230 has an inlet 231 communicating with the liquid inlet channel on the side away from the hollow plate body 220 along the second direction. The second support 240 has an outlet 241 communicating with the liquid outlet channel on the side away from the hollow plate body 220 along the second direction. The inlet 231 and outlet 241 are directly opposite to the through hole 112 on the first end plate 110. The through hole 112 can avoid the inlet 231 and outlet 241, so that the inlet 231 and outlet 241 can be connected to the circulation pipeline of the cooling medium. Thus, the cooling medium can enter the cavity 221 through the inlet 231 and the liquid inlet channel, exchange heat with the cell electrode assembly 300, and then flow out of the cell housing through the outlet channel and outlet 241.

[0032] See also Figure 3 and Figure 4Along the second direction, the width of the hollow plate portion 220 is W2, and the width of the shell body 100 is A. The relationship between W2 and A satisfies: 0.2 ≤ W2 / A ≤ 0.35. For example, the value of W2 / A can be 0.2, 0.22, 0.25, 0.28, 0.3, 0.32, 0.34, or 0.35, etc. By limiting the value of W2 / A within the above range, the cooling effect of the cooling component 200 on the cell electrode assembly 300 is ensured, the temperature uniformity of the cell electrode assembly 300 is good, and the structural strength of the cooling component 200 itself is relatively large, making it less prone to bending deformation. If the value of W2 / A is too small, the width ratio of the cavity 221 inside the hollow plate portion 220 of the cooling component 200 for the cooling medium to flow is insufficient, resulting in poor cooling effect at the center position of the cell electrode assembly 300, and the cavity 221 is too small to be easily processed and formed. If the value of W2 / A is too large, the width of the cavity 221 inside the hollow plate portion 220 of the cooling component 200, which allows the cooling medium to flow, will be too large, occupying a large amount of space. This will reduce the arrangement space of the cell electrode group 300, which is not conducive to increasing the capacity of the cell. Moreover, the size of the hollow plate portion 220 will increase, and there will be more hollow thin-walled positions in the cooling component 200, which will relatively reduce the structural stability, decrease the support performance of the housing body 100, and make it more prone to deformation risk.

[0033] Furthermore, along the third direction, the wall thickness of the hollow plate body 220 is T2, and the total thickness of the hollow plate body 220 along the third direction is M. The relationship between M and T2 satisfies: 1.2mm ≤ M-2×T2 ≤ 4.5mm. Here, M-2×T2 is the height of the cavity 221 in the hollow plate body 220 along the third direction. For example, the value of M-2×T2 can be 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, or 4.5mm, etc. By limiting the value of M-2×T2 within the above range, the volume of the cavity 221 inside the hollow plate body 220 is ensured to be large enough to meet the requirements of rapid flow of the cooling medium, resulting in good cooling effect. Optionally, in some embodiments, the thickness of the solid plate portion 210 along the first direction is T1, and the wall thickness of the hollow plate portion 220 is equal to the thickness of the solid plate portion 210, i.e., T1=T2. The value of T1 is in the range of 0.8mm≤T1≤3.5mm. For example, the value of T1 can be 0.8mm, 1.0mm, 1.2mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, or 3.5mm, etc. By limiting the value of T1 to the above range, the mechanical strength of the solid plate portion 210 and the hollow plate portion 220 is ensured to be high, and deformation problems are not easy to occur. The installation structure of the cooling component 200 in the housing body 100 is reliable and firm.

[0034] Optionally, each second end plate 120 is provided with a mating protrusion 121. Two mating protrusions 121 protrude in opposite directions along a third direction, and both extend along a first direction. The mating protrusion 121 forms a first accommodating space on the side facing the accommodating cavity, capable of accommodating a portion of the cell electrode assembly 300. This effectively increases the volume of the cell electrode assembly 300 inside the housing body 100, improves the cell capacity, and increases the assembly height of the cell electrode assembly 300 within the cell housing. Along the second direction, the width of the mating protrusion 121 is W1, and the width of the housing body 100 is A. The relationship between W1 and A satisfies: 0.5 ≤ W1 / A ≤ 0.75. For example, the value of W1 / A can be 0.5, 0.55, 0.6, 0.65, 0.7, or 0.75, etc. By limiting the value of W1 / A within the above range, the volume of the internal cavity of the housing body 100 is effectively increased, the volume of the cell electrode group 300 is increased significantly, and the cell capacity is significantly improved.

[0035] Along a third direction, the distance between the end faces of the two second end plates 120 that are opposite to each other is B1, and the distance between the end faces of the two mating protrusions 121 that are opposite to each other is B2. The relationship between B1 and B2 satisfies: 16mm ≤ B2 - B1 ≤ 60mm. For example, the value of B2 - B1 can be 16mm, 18mm, 20mm, 30mm, 40mm, 50mm, or 60mm, etc. By limiting the value of B2 - B1 to the above range, the size of the mating protrusions 121 protruding from the second end plate 120 will not be too large, the housing body 100 is easy to process and form, and the volume of the internal accommodating cavity of the housing body 100 is effectively increased, the volume of the cell electrode assembly 300 is increased significantly, and the cell capacity is significantly improved. If the value of B2-B1 is too small, the volume of the internal cavity of the housing body 100 will increase only slightly, and the capacity increase of the battery cell will not be obvious. If the value of B2-B1 is too large, the yield of stamping and forming the convex 121 on the second end plate 120 will decrease, and the structural strength of the housing body 100 after stamping will decrease, making it prone to deformation and reducing reliability.

[0036] See also Figure 2The second end plate 120 extends outward from both ends along the first direction to form flanges 122. The flanges 122 and the side edges of the second end plate 120 along the first direction are transitionally connected by inclined portions 1221. Along the second direction, the width of the end of the flange 122 furthest from the second end plate 120 is W3, and the width of the mating protrusion 121 is W1. The relationship between W1 and W3 satisfies: 6mm ≤ W3 - W1 ≤ 20mm. For example, the value of W3 - W1 can be 6mm, 8mm, 10mm, 12mm, 15mm, 18mm, or 20mm, etc. By limiting the value of W3 - W1 to the above range, both the mating protrusion 121 and the flange 122 can be smoothly formed. Otherwise, if the value of W3-W1 is too small, the distance between the side of the mating convex 121 along the second direction and the inclined portion 1221 of the flange 122 will be too close, resulting in a decrease in the yield of the mating convex 121 and the flange 122. If the value of W3-W1 is too large, the width of the mating convex 121 along the second direction will be small, the volume of the internal cavity of the housing body 100 will not increase significantly, and the volume of the cell electrode group 300 will not increase much, which is not conducive to increasing the capacity of the cell.

[0037] Optionally, along the first direction, the distance between the two flanges 122 on opposite sides is E, which is also the total length of the housing body 100. The value of E ranges from 300mm to 1000mm. For example, the value of E can be 300mm, 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, or 1000mm, etc. By limiting the value of E to the above range, the internal cavity of the cell housing is larger, and the capacity of the cell is higher.

[0038] This embodiment also provides a battery cell, see [link to example]. Figures 12-15 The battery cell is a blade battery cell. The cell includes the aforementioned cell housing, cell electrode assembly 300, and two cell cover plates 400. The cell housing has two openings 101 at both ends along a first direction, each opening 101 connecting to a cell cover plate 400. The cell electrode assembly 300 is encapsulated by the two cell cover plates 400 and the cell housing. The specially designed cell housing ensures that the cell electrode assembly 300 is not easily damaged by pressure. The cell housing provides good positioning and support for the cell electrode assembly 300, while also increasing the arrangement space for the cell electrode assembly 300. The space utilization rate of the cell electrode assembly 300 within the cell housing is high, resulting in high capacity and assembly ratio. Furthermore, the cooling element 200 in the cell housing can cool the cell electrode assembly 300, ensuring it operates at a suitable temperature and providing good charging and discharging performance.

[0039] See also Figure 13 and Figure 14In this embodiment, the cooling element 200 within the housing body 100 divides the accommodating cavity within the housing body 100 into two relatively independent chambers. The battery cell electrode assembly 300 includes a first component 310 and a second component 320, which are respectively disposed within one chamber. The first component 310 and the second component 320 are stacked along a third direction. The cooling element 200 contacts and exchanges heat with the first component 310 and the second component 320 on opposite sides along the third direction, thereby enabling rapid heat dissipation in the central region of the battery cell electrode assembly 300, improving the cooling effect in the central region of the battery cell electrode assembly 300, and ensuring good temperature uniformity.

[0040] Furthermore, the first component 310 and the second component 320 have the same structure, and are arranged symmetrically about the cooling component 200. The structure of the cell electrode assembly 300 will be described below using the first component 310 as an example. The first component 310 has a first protrusion 311 on its side away from the second component 320 along a third direction. The first protrusion 311 is housed within a first accommodating space at the mating protrusion 121 of the housing body 100, thereby increasing the volume of the cell electrode assembly 300 and facilitating increased cell capacity. Second protrusions 312 are provided at opposite ends of the first component 310 along the first direction. The two second protrusions 312 located at the same end of the first component 310 and the second component 320 are positioned close to the center of their cross-sections. The provision of the second protrusions 312 further increases the volume of the cell electrode assembly 300, which is beneficial for increasing cell capacity. Furthermore, the second protrusion 312 can cooperate with the cell cover plate 400 to improve the positioning accuracy between the cell electrode assembly 300 and the cell cover plate 400, making it less likely to damage the cell electrode assembly 300 when the cell cover plate 400 presses the cell electrode assembly 300 into the housing. Both ends of the first split body 310 and the second split body 320 along the first direction are provided with tabs 313, which are used for conductive connection with the electrode posts 440 on the cell cover plate 400. Optionally, the end of the first split body 310 along the first direction is also provided with a guide slope 314, which is used to cooperate with the flange 122 in the housing body 100.

[0041] See also Figure 15, the cell cover plate 400 in this embodiment includes a cover plate body 410, a first insulating member 420, a second insulating member, a connecting member 430, and a pole column 440. Among them, the second insulating member, the cover plate body 410, the first insulating member 420, and the connecting member 430 are stacked in sequence along the first direction. The first insulating member 420 insulates the connecting member 430 from the cover plate body 410, and the second insulating member insulates the cover plate body 410 from the cell electrode group 300. The cover plate body 410 is provided with a protective convex bump 411. The second insulating member, the cover plate body 410, the first insulating member 420, and the connecting member 430 are in a "hui" shape. The protective convex bump 411 passes through the through holes in the middle of the second insulating member, the cover plate body 410, the first insulating member 420, and the connecting member 430. A second accommodating space is formed inside the protective convex bump 411, and the extending convex platform of the cell electrode group 300 is installed in the second accommodating space. Through the cooperation of the protective convex bump 411 and the second convex platform 312, precise positioning between the cell cover plate 400 and the cell electrode group 300 is achieved. The circumferential edge of the cover plate body 410 is welded to the opening 101 of the housing body 100 along the first direction, thereby encapsulating the cell electrode group 300 in the accommodating cavity.

[0042] There are four pole columns 440, and the four pole columns 440 are divided into two groups and arranged on both sides of the protective convex bump 411. Each pole column 440 is located at a corner of the cell cover plate 400. The pole column 440 passes through the second insulating member, the cover plate body 410, the first insulating member 420, and the connecting member 430. One end of each pole column 440 is connected to a corresponding pole ear 313, and the other ends of the pole columns 440 are all connected to the connecting member 430. The connecting member 430 is used to connect to the busbar for series / parallel connection of cells. Since the pole column 440 is located at the side of the protective convex bump 411, and along the first direction, the end faces of the pole column 440 and the connecting member 430背离电芯极组300一侧 are both lower than the protective convex bump 411, it can provide good protection for the connecting member 430 and the pole column 440, avoid the situation of being bruised during the manufacturing process, improve the safety performance of the cell, and the appearance of the cell is good. Moreover, after the cells are grouped and welded to the busbar, the height of the busbar is also lower than the protective convex bump 411, saving the assembly space of the battery module, improving the module grouping rate, and further improving the performance index of the battery module.

[0043] Next, the relevant dimension designs of the above cell housing are verified with samples in some specific embodiments. For details, see Table 1.

[0044] Table 1 It should be noted that there is an unclear part in the original text where "背离电芯极组300一侧" is not a complete and clear expression. It may need to be further clarified in the original context.As can be seen from the above results, the value ranges of parameters H, W1 / A, W2 / A, W3-W1, T1, M-2×T2, B2-B1, L, K×F, and E in Examples 1 to 6 meet their corresponding size limitations. The yield rate of assembly between the cell electrode group 300 and the cell housing is high, and the cooling component 200 provides good support for the housing body 100. No deformation of the cell housing due to insufficient strength occurs. The positioning of the cell electrode group 300 within the cell housing is accurate. After assembly, neither the cell electrode group 300 nor the cell housing is deformed or damaged. The volume of the cell electrode group 300 is significantly increased, and the cell capacity is large, meeting the need for high energy storage. The cooling component 200 has a significant cooling effect on the cell electrode group 300. The operating temperature of the cell electrode group 300 is suitable, and its working performance is good. The cell housing product is of good quality.

[0045] In Comparative Example 1, the value of parameter W1 / A is less than the minimum value of 0.5 ≤ W1 / A ≤ 0.75. At this time, the width of the convex hull 121 along the third direction is relatively small, which is not conducive to increasing the volume of the cavity inside the housing body 100. The volume increase of the cell electrode group 300 is not significant, the capacity improvement effect of the cell is poor, and the cell housing product is defective.

[0046] In Comparative Example 2, the value of parameter W1 / A is greater than the maximum value of 0.5 ≤ W1 / A ≤ 0.75. At this time, the width ratio of the mating convex hull 121 along the third direction is too large, making it difficult to process and shape the shell body 100, and reducing the structural strength, resulting in defective battery cell shell products.

[0047] In Comparative Example 3, the value of parameter W2 / A is less than the minimum value of 0.2≤W2 / A≤0.35. At this time, the width of the hollow plate body 220 in the second direction of the cooling component 200 is small, which is not conducive to the processing and forming of the cooling component 200. Moreover, the cooling component 200 has a poor cooling effect on the central area of ​​the cell electrode group 300, resulting in a decrease in cell performance and a defective cell shell product.

[0048] In Comparative Example 4, the value of parameter W2 / A is greater than the maximum value of 0.2≤W2 / A≤0.35. At this time, the width of the hollow plate body 220 in the second direction of the cooling component 200 is too large, and the width of the solid plate body 210 is reduced. The structural strength of the cooling component 200 is too weak and insufficient to support the cell electrode assembly 300. The stability of the cell electrode assembly 300 in the cell housing decreases. Moreover, the space occupied by the cooling component 200 increases, reducing the volume increase of the cell electrode assembly 300. The capacity improvement effect of the cell is not good, and the cell housing product is defective.

[0049] In Comparative Example 5, the value of parameter K×F is less than 12 mm. 2 ≤K×F≤80mm 2The minimum value. At this time, the size of the liquid inlet 231 and liquid outlet 241 on the cooling component 200 corresponding to the through hole 112 is small, the flow area of ​​the liquid inlet channel and liquid outlet channel in the first bracket 230 and the second bracket 240 is small, which affects the flow speed of the cooling medium, the heat exchange rate is slow, the cooling time is increased, the cooling effect at the center position of the cell electrode group 300 is not good, and the cell shell product is defective.

[0050] In Comparative Example 6, the value of parameter K×F is greater than 12 mm. 2 ≤K×F≤80mm 2 The maximum value. At this time, the cross-sectional area of ​​the through hole 112 is too large, which leads to a decrease in the mechanical strength of the first end plate 110. Moreover, the size of the liquid inlet 231 and liquid outlet 241 on the cooling component 200 corresponding to the through hole 112 is too large. The flow area of ​​the liquid inlet channel and liquid outlet channel in the first bracket 230 and the second bracket 240 is large, which occupies a large space. The arrangement space of the cell electrode group 300 is reduced, which is not conducive to improving the capacity of the cell. The cell shell product is defective.

[0051] Taking all factors into consideration, when the dimensions of the cell housing meet the above requirements, a high yield rate for the assembly of the cell electrode assembly 300 and the cell housing can be guaranteed, along with high strength of the cell housing and accurate positioning of the cell electrode assembly 300 within the cell housing. After assembly, neither the cell electrode assembly 300 nor the cell housing exhibits deformation or damage. The volume of the cell electrode assembly 300 is significantly increased, resulting in a larger cell capacity to meet the needs of high energy storage. The cell electrode assembly 300 operates at a suitable temperature and exhibits good performance.

[0052] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery cell housing, characterized in that, include: The housing body includes two first end plates and two second end plates extending along a first direction. The two first end plates are opposite each other along a second direction, and the two second end plates are opposite each other along a third direction. The two first end plates and the two second end plates form an accommodating cavity. Each first end plate has a mounting portion on its inner wall facing the accommodating cavity, and the mounting portion has a through hole on one side along the first direction. A cooling component is disposed within the housing body. The two ends of the cooling component along the second direction are respectively connected to the mounting portion on a first end plate. The cooling component has a cavity for the flow of cooling medium. The cooling component includes an inlet and an outlet communicating with the cavity. The inlet and the outlet are respectively opposite to the through hole on a first end plate.

2. The cell housing according to claim 1, characterized in that, The mounting portion includes a first support bar and a second support bar, which are spaced apart along a third direction. A slot is formed between the first support bar and the second support bar. The cooling component is inserted into one of the slots at both ends along a second direction. The depth of the slot along the second direction is H. The value of H is in the range of 0.8mm ≤ H ≤ 1.5mm.

3. The cell housing according to claim 2, characterized in that, The cooling component includes two solid plate sections and a hollow plate section. The two solid plate sections are distributed on both sides of the hollow plate section along the second direction and are respectively connected to one of the slots. The hollow plate section forms the cavity. The cooling component further includes a first bracket and a second bracket. The first bracket and the second bracket are located at the ends of the solid plate portion along the first direction, and the first bracket and the second bracket are respectively disposed on both sides of the hollow plate portion along the second direction. A liquid inlet channel is formed in the first bracket, and a liquid outlet channel is formed in the second bracket. Both the liquid inlet channel and the liquid outlet channel are in communication with the cavity. The liquid inlet is provided on the side of the first bracket away from the hollow plate portion along the second direction, and the liquid outlet is provided on the side of the second bracket away from the hollow plate portion along the second direction.

4. The cell housing according to claim 3, characterized in that, Along the second direction, the width of the hollow plate portion is W2, and the width of the shell body is A; The relationship between W2 and A satisfies: 0.2≤W2 / A≤0.

35.

5. The cell housing according to claim 3, characterized in that, Along the third direction, the thickness of the solid plate portion is T1, and the wall thickness of the hollow plate portion is T2; the total thickness of the hollow plate portion along the third direction is M; The relationship between M and T2 satisfies: 1.2mm ≤ M-2×T2 ≤ 4.5mm; The value range of T1 is: 0.8mm≤T1≤3.5mm.

6. The cell housing according to claim 1, characterized in that, Each of the second end plates is provided with a mating protrusion, which extends along a first direction; Along the second direction, the width of the mating convex hull is W1, and the width of the housing body is A; The relationship between W1 and A satisfies: 0.5 ≤ W1 / A ≤ 0.75; And / or, along a third direction, the distance between the end faces of the two second end plates that are opposite to each other is B1, and the distance between the end faces of the two mating convex buds that are opposite to each other is B2. The relationship between B1 and B2 satisfies: 16mm≤B2-B1≤60mm.

7. The cell housing according to claim 6, characterized in that, The two ends of the second end plate extend outward along the first direction to form flanges, and the flanges are connected to the side of the second end plate along the first direction through an inclined portion. Along the second direction, the width of the flange at the end away from the second end plate is W3; The relationship between W1 and W3 satisfies: 6mm≤W3-W1≤20mm.

8. The cell housing according to claim 1, characterized in that, Along the first direction, the distance between the end of the cooling component having the liquid inlet and / or the liquid outlet and the adjacent side of the first end plate is L; The value of L is in the range of 5.5mm≤L≤15mm.

9. The cell housing according to claim 1, characterized in that, The through hole is rectangular, the length of the through hole along the first direction is K, and the width of the through hole along the third direction is F; The relationship between K and F satisfies: 12mm 2 ≤K×F≤80mm 2 .

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

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