Battery pole group and battery
Patent Information
- Application Number
- CN202610945582.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-29
- Publication Date
- 2026-09-25
AI Technical Summary
[0004]现有电池极组普遍采用规则的圆柱形或长方体形结构，当需要提升电池极组容量以满足更高的储能需求时，仅能通过等比例放大极组整体尺寸的方式实现，该方式不仅会导致电池极组的体积大幅增加，还难以适配各类异形安装空间，造成安装空间的大量浪费，严重限制了电池系统整体能量密度的提升，同时由于电池极组与外部的电池壳体均为规则的圆形或长方体，二者之间难以形成紧密的贴合与限位，还存在极组窜动、移位的安全风险；另一方面，现有技术中为提升导电极耳的过流能力，通常采用增大导电极耳面积的方式降低内阻，但过大的导电极耳会占用极组内部的有效储能空间，进一步降低电池的容量密度，导致无法在保证导电极耳过流能力的同时维持较高的电池容量密度
本发明提供了一种电池极组，该电池极组通过设置截面为圆形的衔接极体，并在衔接极体的两侧设置由截面为圆形的对接部和截面为矩形的连接部构成的连接极体，不仅与传统极组单一规则圆柱或矩形的结构相比，可灵活适配异形安装空间，大幅提升了空间利用率，同时利用多极体结构配合连接极体上的卡接凸台，拓展了电池极组整体的有效储能体积，在实现高储能容量的同时避免了传统整体扩容方式带来的空间浪费问题，而且异形结构还有助于电池极组与电池壳体之间的限位和固定，有效避免电池极组发生窜动，其次通过在每个卡接凸台的两侧设置导电极耳，一方面通过多极耳设计有效增大了总过流面积，显著提升了极组的大电流过流性能，另一方面分体式的极耳布局避免了单极耳面积过大带来的电流分布不均、局部过热问题，同时将导电极耳背离连接部的表面低于卡接凸台背离连接部的表面，使得导电极耳在空间上与连接极体存在空间重叠，不会额外占用电池极组的外部空间，且通过卡接凸台对于导电极耳进行防护，避免导电极耳因磕碰导致损伤。
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Figure CN122822897A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and more particularly to a battery electrode assembly and a battery. Background Technology
[0002] With the rapid development of new energy technologies, lithium-ion batteries, with their advantages of high energy density, long cycle life, and low self-discharge rate, have been widely used in consumer electronics, new energy vehicles, energy storage power stations, and other fields. As the core energy storage component of lithium-ion batteries, the battery electrode assembly is the central site where electrochemical reactions occur inside the battery. Its performance directly determines the battery's capacity, energy density, rate performance, and cycle life, making it a core component affecting the overall performance of the battery.
[0003] Existing battery electrode packs are typically manufactured using winding or stacking processes, and mainly consist of positive electrode sheets, negative electrode sheets, and a separator membrane spaced between the positive and negative electrode sheets. The substrate surfaces of the positive and negative electrode sheets are coated with positive and negative active materials, respectively. To enable the external output of internal electrical energy and the internal input of external electrical energy, conductive tabs need to be welded onto the uncoated areas of the positive and negative electrode sheets. The conductive tabs are used to achieve electrical connection between the battery electrode pack and the external circuit. Therefore, the overcurrent capacity of the conductive tabs is a key factor affecting the charge and discharge performance of the battery.
[0004] Existing battery electrode packs generally adopt a regular cylindrical or cuboid structure. When it is necessary to increase the capacity of the battery electrode pack to meet higher energy storage requirements, the only way to achieve this is by proportionally enlarging the overall size of the electrode pack. This method not only leads to a significant increase in the volume of the battery electrode pack, but also makes it difficult to adapt to various irregularly shaped installation spaces, resulting in a large waste of installation space and severely limiting the improvement of the overall energy density of the battery system. At the same time, since both the battery electrode pack and the external battery casing are regular circles or cuboids, it is difficult to form a tight fit and containment between them, and there is also a safety risk of electrode pack movement and displacement. On the other hand, in order to improve the overcurrent capacity of the conductive electrode tabs, existing technologies usually use the method of increasing the area of the conductive electrode tabs to reduce internal resistance. However, excessively large conductive electrode tabs will occupy the effective energy storage space inside the electrode pack, further reducing the battery capacity density, resulting in the inability to maintain a high battery capacity density while ensuring the overcurrent capacity of the conductive electrode tabs. Summary of the Invention
[0005] The purpose of this invention is to provide a battery electrode assembly and a battery that achieves high energy storage capacity while having excellent space adaptability and utilization, excellent high current overcurrent performance and high volumetric capacity density, and good fixed limiting effect.
[0006] To achieve this objective, the present invention adopts the following technical solution: On one hand, a battery electrode assembly is provided, the battery electrode assembly comprising: A connecting electrode, wherein the cross-section of the connecting electrode is circular, and a first conductive coating is provided on both end faces of the connecting electrode along the first direction; Two connecting electrodes are respectively disposed on both sides of the connecting electrode along the first direction. Each connecting electrode includes a docking portion and a connecting portion. The docking portion has a circular cross-section and is connected to the connecting electrode. The surface of the docking portion facing the connecting electrode is provided with a second conductive coating. The connecting portion has a rectangular cross-section and is disposed on the side of the docking portion away from the connecting electrode. The side of the connecting portion away from the docking portion is provided with two snap-fit protrusions that are spaced apart along the second direction and inserted into the battery cover. The conductive electrode ear and the snap-fit protrusion are disposed on the same surface of the connecting part. Each snap-fit protrusion has a conductive electrode ear on both sides along a third direction. The surface of the conductive electrode ear facing away from the connecting part is lower than the surface of the snap-fit protrusion facing away from the connecting part. The first direction is the length direction of the connecting electrode body, the second direction is the width direction of the connecting electrode body, and the third direction is the height direction of the connecting electrode body.
[0007] Optionally, the connecting part has two locking grooves on both sides of the third direction for engaging with the battery housing. The distance between the two locking protrusions in the second direction is L1, and the distance between the two locking grooves on the same surface of the connecting part in the second direction is L2, and the two locking protrusions satisfy 20mm≤L2-L1≤90mm.
[0008] Optionally, the width dimension of the connecting portion along the second direction is A, and satisfies 0.6≤L2 / A≤0.8.
[0009] Optionally, the diameter of the mating part is D, and satisfies 6mm≤DA≤140mm.
[0010] Optionally, the height of the snap-fit boss along the third direction is W1, and the distance between the two snap-fit grooves located on different surfaces of the connecting part along the third direction is W2, satisfying 16mm≤W2-W1≤40mm.
[0011] Optionally, the height dimension of the connecting part along the third direction is B, and satisfies 0.2≤W1 / B≤0.5.
[0012] Optionally, the thickness of the connecting electrode along the first direction is F1, and satisfies 30mm≤F1≤80mm.
[0013] Optionally, the thickness of the mating portion along the first direction is F2, and the length of the connecting electrode along the first direction is E, satisfying 0.1≤F2 / E≤0.3.
[0014] Optionally, the connecting part has an insertion groove located between the two snap-fit protrusions on the side opposite to the docking part for insertion into the battery housing. The length of the insertion groove along the first direction is K, and satisfies 30mm≤K≤120mm.
[0015] On the other hand, a battery is provided, the battery including a battery casing, a battery cover and a battery electrode assembly as described in any of the preceding claims, the battery casing being a hollow casing structure with an opening, and the battery cover being disposed at the opening of the battery casing to close the battery casing and form a receiving space for accommodating the battery electrode assembly.
[0016] The beneficial effects of this invention are: This invention provides a battery electrode assembly. This assembly features a circular cross-section connecting electrode, with connecting electrodes on both sides consisting of a circular cross-section mating portion and a rectangular cross-section connecting portion. Compared to traditional electrode assemblies with a single regular cylindrical or rectangular structure, this design allows for flexible adaptation to irregularly shaped installation spaces, significantly improving space utilization. Furthermore, the multi-electrode structure, combined with snap-fit protrusions on the connecting electrodes, expands the overall effective energy storage volume of the battery electrode assembly. This achieves high energy storage capacity while avoiding the space waste associated with traditional overall capacity expansion methods. Moreover, the irregular structure also facilitates the positioning and connection between the battery electrode assembly and the battery casing. The design effectively prevents the battery electrode assembly from shifting. Secondly, by setting conductive tabs on both sides of each snap-fit protrusion, the multi-tab design effectively increases the total current-carrying area, significantly improving the high-current-carrying performance of the electrode assembly. On the other hand, the split tab layout avoids the problems of uneven current distribution and local overheating caused by excessively large single tab area. At the same time, the surface of the conductive tab away from the connection part is lower than the surface of the snap-fit protrusion away from the connection part, so that the conductive tab overlaps with the connecting electrode in space, without occupying additional external space of the battery electrode assembly. Furthermore, the snap-fit protrusion protects the conductive tab from damage caused by impacts.
[0017] The present invention also provides a battery that, by applying the above-mentioned battery electrode assembly, can be flexibly adapted to various irregular installation spaces, has better environmental adaptability, and can achieve higher energy storage capacity, significantly improving the battery's range performance. Attached Figure Description
[0018] Figure 1 This is a structural assembly diagram of the battery electrode assembly provided by the present invention; Figure 2 This is a structural exploded view of the battery electrode assembly provided by the present invention; Figure 3 This is a schematic diagram of the structure of the connecting electrode in the battery electrode assembly provided by the present invention; Figure 4 This is a planar schematic diagram of the end of the connecting electrode in the battery electrode assembly provided by the present invention; Figure 5 This is a top view of the battery electrode assembly provided by the present invention; Figure 6 This is a front view of the battery electrode assembly provided by the present invention; Figure 7 This is a cross-sectional view of the battery electrode assembly provided by the present invention.
[0019] In the picture: 1. Connecting electrode; 11. First conductive coating; 2. Connecting electrode; 21. Butt joint; 22. Connecting part; 23. Second conductive coating; 24. Snap-fit boss; 25. Snap-fit groove; 26. Insertion slot; 3. Conductive electrode ear. 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," "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] With the rapid development of new energy technologies, lithium-ion batteries, with their advantages of high energy density, long cycle life, and low self-discharge rate, have been widely used in consumer electronics, new energy vehicles, energy storage power stations, and other fields. As the core energy storage component of lithium-ion batteries, the battery electrode assembly is the central site where electrochemical reactions occur inside the battery. Its performance directly determines the battery's capacity, energy density, rate performance, and cycle life, making it a core component affecting the overall performance of the battery.
[0025] Existing battery electrode packs are typically manufactured using winding or stacking processes, and mainly consist of positive electrode sheets, negative electrode sheets, and a separator membrane spaced between the positive and negative electrode sheets. The substrate surfaces of the positive and negative electrode sheets are coated with positive and negative active materials, respectively. To enable the external output of internal electrical energy and the internal input of external electrical energy, conductive tabs need to be welded onto the uncoated areas of the positive and negative electrode sheets. The conductive tabs are used to achieve electrical connection between the battery electrode pack and the external circuit. Therefore, the overcurrent capacity of the conductive tabs is a key factor affecting the charge and discharge performance of the battery.
[0026] Existing battery electrode packs generally adopt a regular cylindrical or cuboid structure. When it is necessary to increase the capacity of the battery electrode pack to meet higher energy storage requirements, the only way to achieve this is by proportionally enlarging the overall size of the electrode pack. This method not only leads to a significant increase in the volume of the battery electrode pack, but also makes it difficult to adapt to various irregularly shaped installation spaces, resulting in a large waste of installation space and severely limiting the improvement of the overall energy density of the battery system. At the same time, since both the battery electrode pack and the external battery casing are regular circles or cuboids, it is difficult to form a tight fit and containment between them, and there is also a safety risk of electrode pack movement and displacement. On the other hand, in order to improve the overcurrent capacity of the conductive electrode tabs, existing technologies usually use the method of increasing the area of the conductive electrode tabs to reduce internal resistance. However, excessively large conductive electrode tabs will occupy the effective energy storage space inside the electrode pack, further reducing the battery capacity density, resulting in the inability to maintain a high battery capacity density while ensuring the overcurrent capacity of the conductive electrode tabs.
[0027] Therefore, in order to provide a battery electrode assembly that achieves high energy storage capacity while having excellent space adaptability and utilization, as well as excellent high current overcurrent performance and high volumetric capacity density, this embodiment provides a battery electrode assembly.
[0028] like Figures 1 to 7As shown, the battery electrode assembly includes a connecting electrode 1, two connecting electrodes 2, and conductive electrode tabs 3. The connecting electrode 1 has a circular cross-section, and a first conductive coating 11 is provided on both end faces of the connecting electrode 1 along the first direction. The two connecting electrodes 2 are respectively located on both sides of the connecting electrode 1 along the first direction. Each connecting electrode 2 includes a mating portion 21 and a connecting portion 22. The mating portion 21 has a circular cross-section and is connected to the connecting electrode 1. A second conductive coating 23 is provided on the surface of the mating portion 21 facing the connecting electrode 1. The connecting portion 22 has a rectangular cross-section and is located on the mating portion 21 away from the connecting electrode 1. On one side of the electrode 1, the connecting part 22 is provided with two snap-fit protrusions 24 that are spaced apart along the second direction and inserted into the battery cover. The conductive electrode ears 3 and the snap-fit protrusions 24 are provided on the same surface of the connecting part 22. Each snap-fit protrusion 24 is provided with conductive electrode ears 3 on both sides along the third direction. The surface of the conductive electrode ears 3 away from the connecting part 22 is lower than the surface of the snap-fit protrusions 24 away from the connecting part 22. The first direction is the length direction of the connecting electrode 2, the second direction is the width direction of the connecting electrode 2, and the third direction is the height direction of the connecting electrode 2.
[0029] This battery electrode assembly features a circular cross-section connecting electrode 1, with connecting electrode 2 on both sides of the connecting electrode 1 consisting of a circular cross-section mating portion 21 and a rectangular cross-section connecting portion 22. Compared to the traditional electrode assembly's single regular cylindrical or rectangular structure, this design allows for flexible adaptation to irregularly shaped installation spaces, significantly improving space utilization. Furthermore, the multi-electrode structure, combined with the snap-fit protrusions 24 on the connecting electrode 2, expands the overall effective energy storage volume of the battery electrode assembly. This achieves high energy storage capacity while avoiding the space waste associated with traditional overall capacity expansion methods. Moreover, the irregular structure also facilitates the positioning and fixation between the battery electrode assembly and the battery casing, effectively preventing battery... When the electrode assembly shifts, conductive electrode tabs 3 are provided on both sides of each snap-fit protrusion 24. On the one hand, the multi-tab design effectively increases the total current-carrying area, significantly improving the high-current-carrying performance of the electrode assembly. On the other hand, the split tab layout avoids the problems of uneven current distribution and local overheating caused by excessively large single tab area. At the same time, the surface of the conductive electrode tab 3 away from the connection part 22 is lower than the surface of the snap-fit protrusion 24 away from the connection part 22, so that the conductive electrode tab 3 has spatial overlap with the connecting electrode 2, without occupying additional external space of the battery electrode assembly. Furthermore, the snap-fit protrusion 24 protects the conductive electrode tab 3, preventing damage caused by impact.
[0030] In this embodiment, since the two snap-fit protrusions 24 are spaced apart, in order to increase the flow area of the conductive electrode ear 3 and improve the space utilization, the conductive electrode ear 3 includes a first electrode ear and a second electrode ear. The first electrode ear is disposed on one side of the mating protrusion 24 along the third direction, and the second electrode ear is disposed between the two mating protrusions 24 and is perpendicularly connected to the first electrode ear to form an L-shaped conductive electrode ear.
[0031] Optionally, such as Figure 5 As shown, the connecting part 22 has two locking grooves 25 on both sides along the third direction for locking with the battery housing. The distance between the two locking protrusions 24 along the second direction is L1. The distance between the two locking grooves 25 on the same surface of the connecting part 22 along the third direction is L2, and the distance between the two locking grooves 25 along the second direction is L2, and the conditions are met: 20mm≤L2-L1≤90mm.
[0032] By limiting the difference between the spacing L2 of the two snap-fit grooves 25 on the same surface of the connecting part 22 along the third direction and the spacing L1 of the two snap-fit protrusions 24 along the second direction, so that it satisfies 20mm≤L2-L1≤90mm, it can prevent the spacing between the two snap-fit protrusions 24 from being too large due to the difference being too small, resulting in a poor snap-fit effect with the battery cover. On the other hand, it can also avoid the spacing between the two snap-fit protrusions 24 from being too small due to the difference being too large, which would make it difficult to assemble with the battery cover and increase the assembly difficulty.
[0033] The difference between the spacing L2 of the two snap-fit grooves 25 on the same surface of the connecting part 22 along the third direction and the spacing L1 of the two snap-fit protrusions 24 along the second direction can be any value between 20mm and 90mm or any two values, such as 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, etc.
[0034] Optionally, such as Figure 5 As shown, the width dimension of the connecting part 22 along the second direction is A, and satisfies 0.6≤L2 / A≤0.8.
[0035] By limiting the ratio of the distance L2 between the two snap-fit grooves 25 located on the same surface of the connecting part 22 along the third direction to the width A of the connecting part 22 along the second direction, such that 0.6≤L2 / A≤0.8, it can prevent the space of the two snap-fit grooves 25 from being too large due to the ratio being too small, resulting in the physical volume of the connecting part 22 being too small to meet the power supply requirements. It can also avoid the space of the snap-fit grooves 25 being too small due to the ratio being too large, resulting in poor snap-fit effect with the battery casing.
[0036] The ratio of the distance L2 between the two snap-fit grooves 25 on the same surface of the connecting part 22 along the third direction to the width A of the connecting part 22 along the second direction can be any value between 0.6 and 0.8 or any range between two values, such as 0.6, 0.65, 0.7, 0.72, 0.75, 0.78, 0.8, etc.
[0037] Optionally, such as Figure 5 As shown, the diameter of the docking part 21 is D, and it satisfies 6mm≤DA≤140mm.
[0038] By limiting the difference between the diameter D of the docking part 21 and the width A of the connecting part 22 along the second direction, such that 6mm≤DA≤140mm, it can prevent the docking part 21 from being too small due to an excessively small difference, which would make it difficult to meet the energy supply requirements. It can also avoid the docking part 21 from being too large due to an excessively large difference, which would cause the proportion between the docking part 21 and the connecting part 22 to be unbalanced and make the molding difficult.
[0039] The difference between the diameter D of the mating part 21 and the width A of the connecting part 22 along the second direction can be any value between 6mm and 140mm or any two values, such as 6mm, 20mm, 40mm, 60mm, 80mm, 100mm, 120mm, 140mm, etc.
[0040] In this embodiment, to verify the impact of the above parameter limitations on the battery electrode assembly provided in this embodiment, as shown in Table 1, six sets of embodiments and six sets of comparative examples are provided for verification.
[0041] Table 1 A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the difference between the spacing L2 of the two snap-fit grooves 25 along the second direction and the spacing L1 of the two snap-fit protrusions 24 along the second direction on the same surface of the connecting part 22 is less than the minimum value of the range 20mm≤L2-L1≤90mm, the spacing between the two snap-fit protrusions 24 becomes too large, the physical volume of the snap-fit protrusions 24 becomes too small, and the snap-fit effect with the battery cover is poor. When the difference between the spacing L2 of the two snap-fit grooves 25 along the second direction and the spacing L1 of the two snap-fit protrusions 24 along the second direction on the same surface of the connecting part 22 is greater than the maximum value of the range 20mm≤L2-L1≤90mm, the spacing between the two snap-fit protrusions 24 becomes too small, making assembly with the battery cover difficult and challenging.
[0042] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the ratio of the distance L2 between the two snap-fit grooves 25 on the same surface of the connecting part 22 along the third direction to the width A of the connecting part 22 along the second direction is less than the minimum value in the range 0.6 ≤ L2 / A ≤ 0.8, the space of the two snap-fit grooves 25 is too large, resulting in the solid volume of the connecting part 22 being too small and unable to meet the power supply requirements; when the ratio of the distance L2 between the two snap-fit grooves 25 on the same surface of the connecting part 22 along the third direction to the width A of the connecting part 22 along the second direction is greater than the maximum value in the range 0.6 ≤ L2 / A ≤ 0.8, the space of the snap-fit grooves 25 is too small, and the snap-fit effect with the battery casing is poor.
[0043] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 shows that when the difference between the diameter D of the docking part 21 and the width A of the connecting part 22 along the second direction is less than the minimum value of the range 6mm≤DA≤140mm, the volume of the docking part 21 is small and it is difficult to meet the energy supply requirements; when the difference between the diameter D of the docking part 21 and the width A of the connecting part 22 along the second direction is greater than the maximum value of the range 6mm≤DA≤140mm, the volume of the docking part 21 is too large and the proportion with the connecting part 22 is unbalanced, resulting in high molding difficulty.
[0044] Optionally, such as Figure 6 As shown, the height dimension of the snap-fit boss 24 along the third direction is W1, and the distance dimension of the two snap-fit grooves 25 located on different surfaces of the connecting part 22 along the third direction is W2, and satisfies 16mm≤W2-W1≤40mm.
[0045] By limiting the difference between the spacing W2 of the two snap-fit grooves 25 on different surfaces of the connecting part 22 along the third direction and the height W1 of the snap-fit boss 24 along the third direction, so that it satisfies 16mm≤W2-W1≤40mm, it can prevent the two snap-fit grooves 25 on different surfaces from being too close due to the difference being too small, resulting in a small physical volume of the connecting part 22 that is difficult to meet the power supply requirements. It can also avoid the two snap-fit grooves 25 on different surfaces from being too far apart due to the difference being too large, resulting in a shallow depth of the two snap-fit grooves 25 and poor snap-fit effect with the battery casing.
[0046] The difference between the spacing W2 of the two snap-fit grooves 25 located on different surfaces of the connecting part 22 along the third direction and the height W1 of the snap-fit boss 24 along the third direction can be any value between 16mm and 40mm or any range between two values, such as 16mm, 20mm, 25mm, 30mm, 35mm, 40mm, etc.
[0047] Optionally, such as Figure 6 As shown, the height dimension of the connecting part 22 along the third direction is B, and it satisfies 0.2≤W1 / B≤0.5.
[0048] By limiting the ratio of the height dimension W1 of the snap-fit boss 24 along the third direction to the height dimension B of the connecting part 22 along the third direction, such that it satisfies 0.2≤W1 / B≤0.5, it can prevent the snap-fit boss 24 from being too small in volume and having a poor snap-fit effect with the battery cover, and also avoid the space on both sides of the snap-fit boss 24 for setting the conductive electrode ears 3 from being too small due to the ratio being too large, which would cause the snap-fit boss 24 and the conductive electrode ears 3 to be too close, and easily cause interference when the conductive electrode ears 3 are connected to the battery cover.
[0049] The ratio of the height dimension W1 of the snap-fit boss 24 along the third direction to the height dimension B of the connecting part 22 along the third direction can be any value between 0.2 and 0.5 or any range between two values, such as 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, etc.
[0050] In this embodiment, in order to verify the impact of the above parameter limitations on the battery electrode assembly provided in this embodiment, as shown in Table 2, four sets of embodiments and four sets of comparative examples are provided for verification.
[0051] Table 2 A comparison of Examples 7 to 10 with Comparative Examples 7 to 8 reveals that when the difference between the spacing W2 of the two snap-fit grooves 25 on different surfaces of the connecting part 22 along the third direction and the height W1 of the snap-fit protrusion 24 along the third direction is less than the minimum value of the range 16mm≤W2-W1≤40mm, the two snap-fit grooves 25 on different surfaces are too close, resulting in a small physical volume of the connecting part 22, which is insufficient to meet the power supply requirements. When the difference between the spacing W2 of the two snap-fit grooves 25 on different surfaces of the connecting part 22 along the third direction and the height W1 of the snap-fit protrusion 24 along the third direction is greater than the maximum value of the range 16mm≤W2-W1≤40mm, the two snap-fit grooves 25 on different surfaces are too far apart, resulting in a shallow depth of the two snap-fit grooves 25 and poor snap-fit effect with the battery casing.
[0052] A comparison of Examples 7 to 10 with Comparative Examples 9 to 10 reveals that when the ratio of the height dimension W1 of the snap-fit boss 24 along the third direction to the height dimension B of the connecting part 22 along the third direction is less than the minimum value in the range 0.2≤W1 / B≤0.5, the volume of the snap-fit boss 24 is insufficient, resulting in poor snap-fit effect with the battery cover. When the ratio of the height dimension W1 of the snap-fit boss 24 along the third direction to the height dimension B of the connecting part 22 along the third direction is greater than the maximum value in the range 0.2≤W1 / B≤0.5, the space on both sides of the snap-fit boss 24 for setting the conductive electrode ears 3 is too small, causing the snap-fit boss 24 and the conductive electrode ears 3 to be too close, which easily leads to interference when the conductive electrode ears 3 are connected to the battery cover.
[0053] Optionally, such as Figure 7 As shown, the thickness of the connecting electrode 1 along the first direction is F1, and it satisfies 30mm≤F1≤80mm.
[0054] By limiting the thickness F1 of the connecting electrode 1 along the first direction to satisfy 30mm≤F1≤80mm, it can prevent the connecting electrode 1 from being too thin due to an insufficient F1 value, resulting in insufficient physical volume to meet the power supply requirements. It can also avoid the connecting electrode 1 from being too heavy due to an excessive F1 value, which would make the connecting electrode 1 easy to detach from the connecting electrode 2 and result in poor connection stability.
[0055] In this embodiment, the thickness F1 of the connecting substrate 1 can be freely adjusted according to actual needs. Therefore, a variety of connecting electrodes 1 with different thicknesses can be prepared in advance. Thus, the connecting substrate 1 with different thicknesses can be directly replaced under different capacity requirements, which has strong applicability.
[0056] The thickness F1 of the connecting electrode 1 along the first direction can be any value between 30mm and 80mm or any range between two values, such as 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, etc.
[0057] Optionally, such as Figure 7 As shown, the thickness of the docking part 21 along the first direction is F2, and the length of the connecting pole 2 along the first direction is E, and the condition 0.1≤F2 / E≤0.3 is met.
[0058] By limiting the ratio of the thickness dimension F2 of the docking part 21 along the first direction to the length dimension E of the connecting pole body 2 along the first direction, such that 0.1≤F2 / E≤0.3, it can prevent the solid volume of the docking part 21 from being too small due to the ratio being too small, making it difficult to meet the energy supply requirements, and also avoid the solid volume of the docking part 21 being too large due to the ratio being too large, which would make molding difficult and increase the manufacturing cost.
[0059] The ratio of the thickness dimension F2 of the docking part 21 along the first direction to the length dimension E of the connecting pole body 2 along the first direction can be any value between 0.1 and 0.3 or any range between two values, such as 0.1, 0.15, 0.2, 0.25, 0.3, etc.
[0060] Optionally, such as Figure 5 As shown, the connecting part 22 has an insertion groove 26 located between two snap-fit protrusions 24 on the side opposite to the docking part 21 for insertion into the battery housing. The length of the insertion groove 26 along the first direction is K, and satisfies 30mm≤K≤120mm.
[0061] By limiting the length dimension K of the insertion slot 26 along the first direction to satisfy 30mm≤K≤120mm, it can prevent the connection effect between the connection part 22 and the battery casing from being poor due to K being too small, and also avoid the physical volume of the connection part 22 being reduced too much due to K being too large, making it difficult to meet the power supply requirements.
[0062] The length K of the insertion slot 26 along the first direction can be any value between 30mm and 120mm or any two values, such as 30mm, 40mm, 50mm, 60mm, 80mm, 100mm, 120mm, etc.
[0063] In this embodiment, to verify the impact of the above parameter limitations on the battery electrode assembly provided in this embodiment, as shown in Table 3, six sets of embodiments and six sets of comparative examples are provided for verification.
[0064] Table 3 A comparison of Examples 11 to 16 with Comparative Examples 11 to 12 shows that when the thickness F1 of the connecting electrode 1 along the first direction is less than the minimum value in the range of 30mm≤F1≤80mm, the thickness of the connecting electrode 1 is too small, and the volume of the solid body is insufficient to meet the power supply requirements; when the thickness F1 of the connecting electrode 1 along the first direction is greater than the maximum value in the range of 30mm≤F1≤80mm, the weight of the connecting electrode 1 is too large, which makes the connecting electrode 1 easy to detach from the connecting electrode 2, resulting in poor connection stability.
[0065] A comparison of Examples 11 to 16 with Comparative Examples 13 to 14 shows that when the ratio of the thickness F2 of the docking portion 21 along the first direction to the length E of the connecting electrode 2 along the first direction is less than the minimum value in the range 0.1≤F2 / E≤0.3, the solid volume of the docking portion 21 is small and it is difficult to meet the energy supply requirements; when the ratio of the thickness F2 of the docking portion 21 along the first direction to the length E of the connecting electrode 2 along the first direction is greater than the maximum value in the range 0.1≤F2 / E≤0.3, the solid volume of the docking portion 21 is too large, making molding difficult and increasing the manufacturing cost.
[0066] A comparison of Examples 11 to 16 with Comparative Examples 15 to 16 shows that when the length K of the insertion slot 26 along the first direction is less than the minimum value of the range 30mm≤K≤120mm, the insertion effect between the connecting part 22 and the battery casing is poor; when the length K of the insertion slot 26 along the first direction is greater than the maximum value of the range 30mm≤K≤120mm, the volume of the connecting part 22 is reduced too much, making it difficult to meet the power supply requirements.
[0067] In this embodiment, a battery is also provided, comprising a battery casing, a battery cover, and the aforementioned battery electrode assembly. The battery casing is a hollow casing structure with an opening, and the battery cover is disposed at the opening of the battery casing, closing the battery casing to form a receiving space for accommodating the battery electrode assembly. By applying the aforementioned battery electrode assembly, this battery can flexibly adapt to various irregularly shaped installation spaces, possessing better environmental adaptability, while achieving higher energy storage capacity and significantly improving the battery's range performance.
[0068] 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 electrode assembly, characterized in that, The battery electrode assembly includes: A connecting electrode, wherein the cross-section of the connecting electrode is circular, and a first conductive coating is provided on both end faces of the connecting electrode along the first direction; Two connecting electrodes are respectively disposed on both sides of the connecting electrode along the first direction. Each connecting electrode includes a docking portion and a connecting portion. The docking portion has a circular cross-section and is connected to the connecting electrode. The surface of the docking portion facing the connecting electrode is provided with a second conductive coating. The connecting portion has a rectangular cross-section and is disposed on the side of the docking portion away from the connecting electrode. The side of the connecting portion away from the docking portion is provided with two snap-fit protrusions that are spaced apart along the second direction and inserted into the battery cover. The conductive electrode ear and the snap-fit protrusion are disposed on the same surface of the connecting part. Each snap-fit protrusion has a conductive electrode ear on both sides along a third direction. The surface of the conductive electrode ear facing away from the connecting part is lower than the surface of the snap-fit protrusion facing away from the connecting part. The first direction is the length direction of the connecting electrode body, the second direction is the width direction of the connecting electrode body, and the third direction is the height direction of the connecting electrode body.
2. The battery electrode assembly according to claim 1, characterized in that, The connecting part has two locking grooves on both sides of the third direction for engaging with the battery housing. The distance between the two locking protrusions in the second direction is L1, and the distance between the two locking grooves on the same surface of the connecting part in the third direction is L2, and the two locking grooves satisfy 20mm≤L2-L1≤90mm.
3. The battery electrode assembly according to claim 2, characterized in that, The width dimension of the connecting part along the second direction is A, and satisfies 0.6≤L2 / A≤0.
8.
4. The battery electrode assembly according to claim 1, characterized in that, The diameter of the docking part is D, and it satisfies 6mm≤DA≤140mm.
5. The battery electrode assembly according to claim 2, characterized in that, The height of the snap-fit boss along the third direction is W1, and the distance between the two snap-fit grooves located on different surfaces of the connecting part along the third direction is W2, and satisfies 16mm≤W2-W1≤40mm.
6. The battery electrode assembly according to claim 5, characterized in that, The height dimension of the connecting part along the third direction is B, and satisfies 0.2≤W1 / B≤0.
5.
7. The battery electrode assembly according to claim 1, characterized in that, The thickness of the connecting electrode along the first direction is F1, and it satisfies 30mm≤F1≤80mm.
8. The battery electrode assembly according to claim 1, characterized in that, The thickness of the docking portion along the first direction is F2, and the length of the connecting electrode along the first direction is E, satisfying 0.1≤F2 / E≤0.
3.
9. The battery electrode assembly according to claim 1, characterized in that, The connecting part has an insertion groove on the side opposite to the docking part, located between the two snap-fit protrusions, for insertion into the battery casing. The length of the insertion groove along the first direction is K, and satisfies 30mm≤K≤120mm.
10. A battery, characterized in that, The battery includes a battery casing, a battery cover, and a battery electrode assembly as described in any one of claims 1-9. The battery casing is a hollow casing structure with an opening, and the battery cover is disposed at the opening of the battery casing to close the battery casing and form a receiving space for accommodating the battery electrode assembly.