Battery cell housing and battery cell
By designing a cylindrical housing and cooling components for the cell casing, the problems of matching the cell casing with the cell electrode assembly and heat dissipation were solved, achieving high capacity and efficient heat dissipation of the cell, and improving the performance and lifespan of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- SVOLT ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2026-04-14
- Publication Date
- 2026-07-14
Smart Images
Figure CN122393499A_ABST
Abstract
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 shape of some specially designed battery cell electrode assemblies. This results in low space utilization and low cell capacity and assembly ratio. Furthermore, after the battery cell electrode assembly is assembled with the battery cell casing and battery cell cover, the heat dissipation effect of the battery cell electrode assembly is poor, heat is difficult to dissipate quickly, and the thermal management effect is poor, affecting the performance and service life 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, wherein the battery cell housing can assist in heat dissipation of the battery cell electrode assembly, thereby ensuring that the battery cell electrode assembly is at a better operating temperature, the battery cell has good working performance, and a long service life.
[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 is cylindrical, and the housing body has a first opening at both ends along a first direction. The housing body includes two first side plates arranged opposite each other along a second direction, and two second side plates arranged opposite each other along a third direction. Cooling components are provided one-to-one with the first side plate. Each cooling component and the inner wall of the first side plate form a flow cavity. The first side plate is provided with a coolant inlet and a coolant outlet at both ends along the first direction. The coolant inlet and the coolant outlet are both connected to the flow cavity. Coolant flows in the flow cavity. Along a third direction, the width of the flow cavity is W, and the width of the first side plate is B1; The relationship between W and B1 satisfies: 0.15 ≤ W / B1 ≤ 0.3; The value range of B1 is: 100mm≤B1≤300mm.
[0006] Optionally, along the second direction, the height of the flow cavity is E; The value of E is in the range of 5mm≤E≤25mm.
[0007] Optionally, the cooling assembly includes a flow channel surround plate and two flow channel sealing plates. The flow channel surround plate extends along a first direction and is connected to the inner wall of the first side plate to form a cylindrical structure. The cylindrical structure forms a second opening at each end along the first direction. Each flow channel sealing plate is connected to one end of the flow channel surround plate and the first side plate along the first direction and is used to block the second opening at that end. The flow channel surround plate, the two flow channel sealing plates, and the inner wall of the first side plate form the flow cavity.
[0008] Optionally, the two second side plates are provided with first protrusions in opposite directions, and the inner side of the first protrusions forms a first accommodating space for installing the cell electrode assembly; Along the second direction, the width of the first convex hull is L2, and the width of the second side plate is A1; The relationship between L2 and A1 satisfies: 0.33 ≤ L2 / A1 ≤ 0.7; The value range of A1 is: 150mm≤A1≤500mm.
[0009] Optionally, along the second direction, the distance between the sides of the flow channel enclosures in the two cooling assemblies that are close to each other is A2; The relationship between A1 and A2 satisfies: 16mm≤A1-A2≤70mm.
[0010] Optionally, the second side plate has a trapezoidal flange extending outward from its end along the first direction, and the wide end of the flange is connected to the second side plate. Along the first direction, the flange extends for a length of H; The value range of H is: 15mm≤H≤40mm.
[0011] Optionally, along the second direction, the width of the narrow end of the flange is L1; The relationship between L1 and A1 satisfies: 0.65≤L1 / A1≤0.8.
[0012] Optionally, the flange includes two inclined sides disposed opposite each other along the second direction, and the included angle between the two inclined sides is N; The range of N is: 50°≤N≤120°.
[0013] Optionally, along a third direction, the distance between the end faces of the two first convex hulls that are opposite to each other is B2; The relationship between B2 and B1 satisfies: 16mm≤B2-B1≤60mm.
[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, including a housing body and a cooling assembly. The housing body is formed by two first side plates and two second side plates, creating an accommodating cavity. The cooling assembly corresponds to each of the first side plates. Each of the first side plates has a coolant inlet and a coolant outlet at both ends along a first direction. The cooling assembly and the inner wall of the first side plates form a flow cavity, with both the coolant inlet and outlet communicating with it. Coolant flows through the flow cavity. Heat exchange between the cooling assembly and the sides of the battery cell electrode assembly achieves rapid cooling of the battery cell electrode assembly. Furthermore, increased arrangement space on both sides of the cooling assembly increases the volume of the accommodating cavity within the housing body, resulting in greater arrangement space for the battery cell electrode assembly and higher cell assembly ratio and capacity.
[0016] This invention also provides a battery cell, including the aforementioned battery cell housing. This battery cell housing can accommodate irregularly shaped battery cell electrode assemblies and battery cell cover plates. Through a special structural design, the battery cell housing increases the assembly space for the battery cell electrode assemblies, thereby improving the energy density of the battery cell and resulting in a high assembly ratio. Furthermore, the battery cell electrode assemblies are subjected to balanced forces when inserted into the housing, ensuring good positioning within the housing and reducing the risk of shaking or displacement, crushing, or fragmentation. Simultaneously, the battery cell housing assists in heat dissipation for the battery cell electrode assemblies, maintaining their temperature at a suitable level, resulting in good thermal management and superior battery cell performance. Attached Figure Description
[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the battery cell housing provided in an embodiment of the present invention; Figure 2 yes Figure 1 A magnified view of a section at point I; Figure 3 This is a front view of the battery cell housing provided in an embodiment of the present invention; Figure 4 yes Figure 3 Sectional view of section II-II; Figure 5 yes Figure 4 A magnified view of a section at point IV; Figure 6 yes Figure 3 Sectional view of section III-III; Figure 7This is a schematic diagram of the cell electrode assembly provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of the battery cell structure provided in the embodiments of the present invention; Figure 9 This is a cross-sectional view of the battery cell provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of the battery cell cover plate provided in an embodiment of the present invention.
[0019] In the picture: 100. Housing body; 101. First opening; 110. First side plate; 111. Coolant inlet; 112. Coolant outlet; 113. Settlement tank; 120. Second side plate; 121. First protrusion; 122. Flange; 1221. Bevel; 200. Cooling assembly; 201. Flow cavity; 210. Flow channel enclosure plate; 220. Flow channel sealing plate; 300. Cell electrode assembly; 301. Extended boss; 302. Electrode ear; 303. Mating groove; 304. Mating boss; 400. Cell cover plate; 410. Cover plate body; 411. Protective protrusion; 420. First plastic part; 430. Connector; 440. Terminal post. Detailed Implementation
[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.
[0021] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0023] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0024] like Figure 1 , Figure 7 and Figure 8 As 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 is subjected to 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 for the battery cell electrode assembly 300, maintaining its temperature at a suitable level, resulting in good thermal management and superior battery cell performance.
[0025] Specifically, see [link to relevant documentation] Figures 1-6 In this embodiment, the battery cell housing includes a housing body 100 and a cooling assembly 200. The housing body 100 is cylindrical and includes two first side plates 110 disposed opposite each other along a second direction, and two second side plates 120 disposed opposite each other along a third direction. The two first side plates 110 and the two second side plates 120 form a receiving cavity. The housing body 100 forms first openings 101 at both ends along the first direction, and the first openings 101 communicate with the receiving cavity. 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 1The Z-axis direction is shown in the diagram. Two cooling components 200 are provided, each corresponding to a first side plate 110. The cooling components 200 and the first side plate 110 extend in the same direction, also along the first direction. The cooling components 200 are located at the midpoint of the first side plate 110 along the third direction. The first side plate 110 has a coolant inlet 111 and a coolant outlet 112 at its two ends along the first direction. The cooling components 200 and the inner wall of the first side plate 110 form a flow cavity 201. Both the coolant inlet 111 and the coolant outlet 112 communicate with the flow cavity 201, and coolant flows within the flow cavity 201. Through this arrangement, coolant can enter the battery cell housing from outside and then exchange heat with the side portion of the battery cell electrode assembly 300 along the second direction via the cooling components 200, achieving rapid cooling of the battery cell electrode assembly 300.
[0026] See also Figure 2 , Figure 5 and Figure 6 In this embodiment, the two second side plates 120 are provided with first protrusions 121 along mutually opposite directions, and the inner side of the first protrusions 121 forms a first accommodating space for installing the cell electrode assembly 300. By setting the first protrusions 121, the volume of the accommodating cavity inside the housing body 100 can be increased, the arrangement space of the cell electrode assembly 300 can be increased, and the capacity of the cell can be higher.
[0027] Furthermore, two second protrusions are provided on the first side plate 110 in a direction away from the receiving cavity. The two second protrusions are located on both sides of the first side plate 110 along a third direction, and the two second protrusions extend along a first direction. A groove 113 is formed between the two second protrusions along the third direction. The arrangement of the second protrusions increases the space within the receiving cavity, facilitating the installation of larger volume battery cell electrode groups 300, thereby increasing the capacity of the battery cell. The cooling assembly 200 includes a flow channel surrounding plate 210 and two flow channel sealing plates 220. The flow channel surrounding plate 210 extends along the first direction and is connected to the inner wall of the first side plate 110 to form a cylindrical structure. The flow channel surrounding plate 210 and the groove 113 are directly opposite each other along a second direction. The cylindrical structure forms a second opening at each end along the first direction. Each flow channel sealing plate 220 is connected to one end of the flow channel surrounding plate 210 and the first side plate 110 along the first direction and is used to block the second opening at that end. The flow channel surrounding plate 210, the two flow channel sealing plates 220 and the inner wall of the first side plate 110 form a flow cavity 201.
[0028] Optionally, along the third direction, the width of the flow cavity 201 formed by the cooling component 200 and the first side plate 110 is W, and the width of the first side plate 110 is B1. The relationship between W and B1 satisfies: 0.15 ≤ W / B1 ≤ 0.3. For example, the value of W / B1 can be 0.15, 0.18, 0.2, 0.22, 0.25, 0.28, or 0.3, etc. By limiting the value of W / B1 to the above range, the contact area between the cooling component 200 and the side portion of the cell electrode assembly 300 along the second direction is larger, which provides good auxiliary heat dissipation for the side portion of the cell electrode assembly 300 along the second direction, and the operating temperature of the cell electrode assembly 300 is suitable.
[0029] For example, the value of B1 ranges from 100mm to 300mm. For instance, the value of B1 can be 100mm, 150mm, 200mm, 250mm, or 300mm. By limiting the value of B1 to this range, the volume of the accommodating cavity formed inside the housing body 100 is larger, enabling it to accommodate a larger volume of the battery cell electrode assembly 300. The value of W can be calculated based on the aforementioned range of W / B1.
[0030] Along a third direction, the distance between the end faces of the two first protrusions 121 facing away from each other is B2, and the relationship between B2 and B1 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 first protrusion 121 protruding from the second side plate 120 will not be too large, the housing body 100 is easy to process and form, and the volume of the internal cavity of the housing body 100 is effectively increased, the volume of the cell electrode group 300 increases significantly, and the cell capacity improvement effect is obvious. If the value of B2 - B1 is too small, the volume of the internal cavity of the housing body 100 increases only slightly, and the cell capacity improvement effect is not obvious; if the value of B2 - B1 is too large, the yield of stamping the first protrusion 121 on the second side plate 120 decreases, and the structural strength of the stamped housing body 100 decreases, making it prone to deformation and reducing reliability.
[0031] Along the second direction, the width of the first convex 121 is L2, and the width of the second side plate 120 is A1. The relationship between L2 and A1 satisfies: 0.33 ≤ L2 / A1 ≤ 0.7. For example, the value of L2 / A1 can be 0.33, 0.4, 0.5, 0.6, 0.65, or 0.7, etc. By limiting the value of L2 / A1 to the above range, the width of the first convex 121 along the second direction is larger, which effectively increases the volume of the internal cavity of the housing body 100, significantly increases the volume of the cell electrode assembly 300, and significantly improves the cell capacity. Optionally, the value range of A1 is: 150mm ≤ A1 ≤ 500mm. For example, the value of A1 can be 150mm, 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, or 500mm, etc.
[0032] Along the second direction, the distance between the sides of the flow channel enclosures 210 in the two cooling components 200 that are close to each other is A2, and the relationship between A1 and A2 satisfies: 16mm ≤ A1 - A2 ≤ 70mm. For example, the value of A1 - A2 can be 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, or 70mm, etc. By limiting the value of A1 - A2 to the above range, the cooling component 200 will not occupy too much of the arrangement space of the cell electrode assembly 300, and the mating groove 303 at the assembly point of the cell electrode assembly 300 with the cooling component 200 will not have a significant impact on the structural strength of the cell electrode assembly 300.
[0033] See also Figure 5 Along the second direction, the height of the flow cavity 201 is E, and the value of E ranges from 5mm to 25mm. For example, the value of E can be 5mm, 8mm, 10mm, 15mm, 20mm, or 25mm, etc. By limiting the values of E and W / B1 to meet their corresponding size constraints, the volume of the flow cavity 201 is ensured to be large enough to meet the need for rapid flow of coolant, and the coolant can exchange heat with the cell electrode assembly 300 in a timely manner and carry away the heat from the cell electrode assembly 300.
[0034] Along the second direction, the wall thickness of the first side plate 110 is T, and the value of T ranges from 0.4 mm to 1 mm. For example, the value of T can be 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, etc. By limiting the value of T to the above range, the shell body 100 is guaranteed to have high mechanical strength and is not prone to deformation. Optionally, in some embodiments, the wall thickness of the flow channel enclosure plate 210, the flow channel sealing plate 220, and the second side plate 120 is consistent with the wall thickness of the first side plate 110.
[0035] See also Figures 3-5In this embodiment, the second side plate 120 extends outward from its end along the first direction with a trapezoidal flange 122, the wide end of which connects to the second side plate 120. The wide end and narrow end of the flange 122 are connected by a bevel 1221. The flange 122 extends for a length H along the first direction, and the value of H is in the range of 15mm ≤ H ≤ 40mm. For example, the value of H can be 15mm, 18mm, 20mm, 25mm, 30mm, 35mm, or 40mm, etc. By limiting the value of H to the above range, the volume of the internal cavity of the housing body 100 is further increased, resulting in a significant increase in the volume of the cell electrode assembly 300 and a noticeable increase in cell capacity. If the value of H is too small, the increase in the volume of the internal cavity of the housing body 100 is small, and the increase in cell capacity is not significant; if the value of H is too large, the size of the flange 122 is too large, which is not conducive to improving the structural strength of the housing body 100, easily leading to deformation problems and reduced reliability.
[0036] Along the second direction, the width of the narrow end of the flange 122 is L1, and the relationship between L1 and A1 satisfies: 0.65 ≤ L1 / A1 ≤ 0.8. For example, the value of L1 / A1 can be 0.65, 0.7, 0.75, or 0.8, etc. By limiting the value of L1 / A1 to the above range, the volume of the internal cavity of the housing body 100 is effectively increased, and the angle of the inclined side 1221 transitioning between the wide end and the narrow end of the flange 122 is appropriate, facilitating assembly with the cell cover plate 400.
[0037] Optionally, the included angle between the two inclined sides 1221 of the flange 122 arranged opposite each other along the second direction 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°, 90°, 100°, 110° or 120°, etc. By limiting the value of N to the above range, the volume of the internal cavity of the housing body 100 is effectively increased, and the inclination angle of the inclined side 1221 transitioning between the wide end and the narrow end of the flange 122 is appropriate, which facilitates assembly with the cell cover plate 400.
[0038] Along the first direction, the distance between the two flanges 122 on opposite sides is F, which is also the total length of the housing body 100. The value of F ranges from 400mm to 1200mm. For example, the value of F can be 400mm, 500mm, 600mm, 700mm, 800mm, 900mm, 1000mm, 1100mm, or 1200mm, etc. By limiting the value of F within the above range, the internal cavity of the cell housing is larger, resulting in a higher cell capacity.
[0039] This embodiment also provides a battery cell, see [link to example]. Figures 7-10The 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 first openings 101 at both ends along a first direction, each first opening 101 being connected 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 component 200 in the cell housing can cool the cell electrode assembly 300, ensuring it operates at a suitable temperature, resulting in good charging and discharging performance of the cell.
[0040] See also Figure 7 and Figure 9 In this embodiment, the cell electrode assembly 300 has a mating groove 303 on each side along the second direction. Each mating groove 303 is adapted to a cooling component 200, thereby ensuring that the orientation of the cell electrode assembly 300 is determined when it is inserted into the casing. This prevents interference between the cell electrode assembly 300 and the cell casing and avoids fragment damage during insertion. Simultaneously, the cooling components 200 on both sides of the cell electrode assembly 300 along the second direction also provide good cooling for the cell electrode assembly 300, resulting in good thermal management performance of the cell.
[0041] Furthermore, the cell electrode assembly 300 has mating bosses 304 on both opposite end faces along a third direction. These mating bosses 304 correspond one-to-one with the first protrusion 121 in the housing body 100 and engage with each other. The addition of the mating bosses 304 increases the volume of the cell electrode assembly 300, which is beneficial for increasing the cell capacity. Moreover, the assembly height of the cell electrode assembly 300 within the cell housing is relatively high. Simultaneously, the mating bosses 304 and the first protrusion 121 also provide good positioning and limiting effects, alleviating the shaking and displacement problems of the cell electrode assembly 300 within the housing body 100, ensuring the stable fixation of the cell electrode assembly 300 within the cell housing.
[0042] Both ends of the battery cell electrode group 300 along the first direction are provided with two extension bosses 301, and the two extension bosses 301 are arranged at intervals along the second direction. The volume of the battery cell electrode group 300 is further increased through the extension bosses 301, which is beneficial to the improvement of the battery cell capacity. Moreover, the arrangement of the extension bosses 301 can also cooperate with the battery cell cover plate 400 to improve the positioning accuracy between the battery cell electrode group 300 and the battery cell cover plate 400. When the battery cell cover plate 400 presses the battery cell electrode group 300 into the shell, it is not easy to damage the battery cell electrode group 300. Two pole ears 302 are further provided at the end of the battery cell electrode group 300 along the first direction, and the two pole ears 302 are respectively arranged on both sides of the extension boss 301 along the third direction. The pole ears 302 are used for electrically connecting with the pole posts 440 on the battery cell cover plate 400.
[0043] Continue to refer to Figure 10 , 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 part 430 and a pole post 440. Among them, the second plastic part, the cover plate body 410, the first plastic part 420 and the connecting part 430 are stacked in sequence along the first direction. The first plastic part 420 insulates the connecting part 430 from the cover plate body 410, and the second plastic part insulates the cover plate body 410 from the battery cell electrode group 300. Two protective convex bumps 411 are provided on the cover plate body 410. The second plastic part, the cover plate body 410, the first plastic part 420 and the connecting part 430 are in the shape of a "day" character. The two protective convex bumps 411 are arranged at intervals along the second direction and both pass 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 part 430. A second accommodation space is formed inside the protective convex bumps 411, and the extension boss 301 of each battery cell electrode group 300 is installed in a second accommodation space. Through the cooperation of the protective convex bumps 411 and the extension bosses 301, precise positioning between the battery cell cover plate 400 and the battery cell electrode group 300 is achieved. The circumferential edge of the cover plate body 410 is welded and connected to the first opening 101 at the end of the housing body 100 along the first direction, thereby encapsulating the battery cell electrode group 300 in the accommodation cavity.
[0044] Four terminals 440 are provided, arranged in two groups on both sides of the protective protrusion 411 along the third direction. Each terminal 440 is located at one corner of the cell cover plate 400. The terminal 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 terminal 440 is connected to a corresponding tab 302, and the other end of each terminal 440 is connected to the connector 430. The connector 430 is used to connect to the busbar of the series / parallel cells. Since the terminals 440 are located on the side of the protective protrusion 411, and the end faces of the terminals 440 and the connector 430 on the side away from the cell electrode group 300 along the first direction are lower than the protective protrusion 411, the protective protrusion 411 can provide good protection for the connector 430 and the terminals 440, avoiding damage during the manufacturing process, improving the safety performance of the cell, and ensuring a good appearance of the cell. Moreover, after the battery cells are assembled and welded into a busbar, the height of the busbar is lower than that of the protective protrusion 411, which saves assembly space for the battery module, increases the module assembly rate, and thus improves the performance indicators of the battery module.
[0045] The following uses samples from specific implementation cases to verify the relevant dimensional design of the above-mentioned battery cell casing. See Table 1 for details.
[0046] Table 1 As can be seen from the above results, the value ranges of parameters H, L1 / A1, A1-A2, E, L2 / A1, B2-B1, W / B1, N, T, and F in Examples 1 to 6 meet their corresponding size limitations. The yield rate of the cell electrode assembly 300 and the cell housing is high. The cooling component 200 plays a limiting role for the cell electrode assembly 300. The positioning of the cell electrode assembly 300 in the cell housing is accurate. After assembly, neither the cell electrode assembly 300 nor the cell housing is deformed or damaged. Moreover, the volume of the cell electrode assembly 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 assembly 300. The operating temperature of the cell electrode assembly 300 is suitable, and its working performance is good. The cell housing product is of good quality.
[0047] In Comparative Example 1, the value of parameter E is less than the minimum value of 5mm≤E≤25mm. At this time, the height of the flow cavity 201 in the second direction of the cooling component 200 is small, the flow area is small, and the coolant cannot carry away the heat of the cell electrode group 300 in time. The cooling effect on the side of the cell electrode group 300 in the second direction is not good. Moreover, the small height of the flow cavity 201 in the second direction is not conducive to the processing and forming of the flow channel plate 210, resulting in a decrease in yield and defective cell shell products.
[0048] In Comparative Example 2, the value of parameter E is greater than the maximum value of 5mm≤E≤25mm. At this time, the height of the flow cavity 201 in the second direction in the cooling assembly 200 is too large, which occupies a large space in the housing body 100. This is not conducive to increasing the volume of the cell electrode group 300, reducing the assembly ratio and making it difficult to increase the capacity of the cell. Moreover, the height of the flow channel plate 210 in the second direction is too large, which increases the weight of the housing body 100, increases the cost, and results in defective cell housing products.
[0049] In Comparative Example 3, the value of parameter L2 / A1 is less than the minimum value of 0.33 ≤ L2 / A1 ≤ 0.7. At this time, the width of the first convex 121 along the second direction is small, the volume increase of the internal cavity of the housing body 100 is limited, the volume increase of the cell electrode group 300 is not significant, the cell capacity increase is not obvious, and the cell housing product is defective.
[0050] In Comparative Example 4, the value of parameter L2 / A1 is greater than the maximum value of 0.33≤L2 / A1≤0.7. The width of this first convex 121 along the second direction is too large, which increases the difficulty of processing the first convex 121 on the housing body 100, makes it difficult to form, increases the cost, and results in defective battery cell housing products.
[0051] In Comparative Example 5, the value of parameter W / B1 is less than the minimum value of 0.15 ≤ W / B1 ≤ 0.3. At this time, the width of the flow cavity 201 in the third direction within the cooling assembly 200 is insufficient, resulting in poor cooling effect on the side of the cell electrode group 300. Furthermore, the size of the flow channel enclosure 210 is too small, making it difficult to process and form, thus reducing the yield rate and causing defects in the cell housing products.
[0052] In Comparative Example 6, the value of parameter W / B1 is greater than the maximum value of 0.15 ≤ W / B1 ≤ 0.3. At this time, the width of the flow cavity 201 in the third direction within the cooling assembly 200 is too large, occupying a large space, reducing the arrangement space of the cell electrode group 300, which is not conducive to improving the cell capacity, and the cell casing product is defective.
[0053] 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.
[0054] 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 is cylindrical, and the housing body has a first opening at both ends along a first direction. The housing body includes two first side plates arranged opposite each other along a second direction, and two second side plates arranged opposite each other along a third direction. Cooling components are provided one-to-one with the first side plate. Each cooling component and the inner wall of the first side plate form a flow cavity. The first side plate is provided with a coolant inlet and a coolant outlet at both ends along the first direction. The coolant inlet and the coolant outlet are both connected to the flow cavity. Coolant flows in the flow cavity. Along a third direction, the width of the flow cavity is W, and the width of the first side plate is B1; The relationship between W and B1 satisfies: 0.15 ≤ W / B1 ≤ 0.3; The value range of B1 is: 100mm≤B1≤300mm.
2. The cell housing according to claim 1, characterized in that, Along the second direction, the height of the flow cavity is E; The value of E is in the range of 5mm≤E≤25mm.
3. The cell housing according to claim 1, characterized in that, The cooling assembly includes a flow channel surround plate and two flow channel sealing plates. The flow channel surround plate extends along a first direction and is connected to the inner wall of the first side plate to form a cylindrical structure. The cylindrical structure forms a second opening at each end along the first direction. Each flow channel sealing plate is connected to one end of the flow channel surround plate and the first side plate along the first direction and is used to block the second opening at that end. The flow channel surround plate, the two flow channel sealing plates, and the inner wall of the first side plate form the flow cavity.
4. The cell housing according to claim 3, characterized in that, The two second side plates are provided with first protrusions in opposite directions, and the inner side of the first protrusions forms a first accommodating space for installing the cell electrode assembly. Along the second direction, the width of the first convex hull is L2, and the width of the second side plate is A1; The relationship between L2 and A1 satisfies: 0.33 ≤ L2 / A1 ≤ 0.7; The value range of A1 is: 150mm≤A1≤500mm.
5. The cell housing according to claim 4, characterized in that, Along the second direction, the distance between the sides of the flow channel enclosures in the two cooling assemblies that are close to each other is A2; The relationship between A1 and A2 satisfies: 16mm≤A1-A2≤70mm.
6. The cell housing according to claim 4, characterized in that, The second side plate has a trapezoidal flange extending outward from its end along the first direction, and the wide end of the flange is connected to the second side plate. Along the first direction, the flange extends for a length of H; The value range of H is: 15mm≤H≤40mm.
7. The cell housing according to claim 6, characterized in that, Along the second direction, the width of the narrow end of the flange is L1; The relationship between L1 and A1 satisfies: 0.65≤L1 / A1≤0.
8.
8. The cell housing according to claim 6, characterized in that, The flange includes two inclined sides arranged opposite each other along the second direction, and the included angle between the two inclined sides is N; The range of N is: 50°≤N≤120°.
9. The cell housing according to claim 4, characterized in that, Along the third direction, the distance between the end faces of the two first convex hulls that are opposite to each other is B2; The relationship between B2 and B1 satisfies: 16mm≤B2-B1≤60mm.
10. A battery cell, characterized in that, The cell housing includes any one of claims 1-9.