Battery pole group and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery electrode assembly and a battery. The battery electrode assembly includes an electrode assembly substrate and conductive electrode tabs. The electrode assembly substrate includes a first side surface, a second side surface, and an end surface. The end surface is polygonal, and the sum of the number of first side surfaces and the number of second side surfaces is equal to the number of sides of the end surface. The first side surface and the second side surface are alternately arranged between two end surfaces to form a polygonal prism structure. The distance between two parallel first side surfaces is greater than the distance between two parallel second side surfaces. Each first side surface has two spaced-apart expansion protrusions, and each first side surface has two conductive electrode tabs, which are located on opposite sides of the expansion protrusions. The surface of the conductive electrode tabs facing away from the first side surface is lower than the surface of the expansion protrusions facing away from the first side surface. This design achieves high energy storage capacity while possessing excellent space utilization, excellent high current overcurrent performance, high volumetric capacity density, and good fixation and limiting effect.

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: The electrode assembly substrate includes multiple first side surfaces, multiple second side surfaces, and two oppositely arranged end surfaces. The end surfaces are polygonal, and the sum of the multiple first side surfaces and the multiple second side surfaces is equal to the number of sides of the end surface. The first side surfaces and the second side surfaces are alternately arranged between the two end surfaces to form a polygonal prism structure. The distance between two parallel first side surfaces is greater than the distance between two parallel second side surfaces. Each first side surface is provided with two expansion bosses, and the two expansion bosses are spaced apart along a first direction, which is the length direction of the expansion bosses. The conductive electrode tabs are provided on each of the first side surfaces. The two conductive electrode tabs are respectively located on both sides of the expansion boss along the second direction. The surface of the conductive electrode tab away from the first side surface is lower than the surface of the expansion boss away from the first side surface. The second direction is the width direction of the expansion boss.

[0007] Optionally, the distance between the surface of the expansion boss away from the first side and the first side along a third direction is H, and satisfies 12mm≤H≤80mm, where the third direction is the height direction of the expansion boss.

[0008] Optionally, the dimension of the expansion boss along the second direction is L1, and the distance between the two end faces along the second direction is B, satisfying 0.2≤L1 / B≤0.55.

[0009] Optionally, the distance between the two conductive electrode tabs connected to the same first side along the second direction is L2, and satisfies 10mm≤L2-L1≤36mm.

[0010] Optionally, the spacing B between the two end faces along the second direction satisfies 20mm ≤ B ≤ 118mm.

[0011] Optionally, the length of the conductive electrode ear along the first direction is E, and the length of the first side surface along the first direction is W1, satisfying 6mm≤W1-E≤16mm.

[0012] Optionally, the distance between the two expansion bosses along the first direction is W2, and satisfies 0.2≤W2 / W1≤0.4.

[0013] Optionally, the length dimension of the electrode substrate along the first direction and the third direction is A, and satisfies 0.2≤W1 / A≤0.5.

[0014] Optionally, two adjacent first sides are perpendicular to each other, and / or two adjacent second sides are perpendicular to each other.

[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, by comprising multiple first sides, multiple second sides, and polygonal end faces, forms a polygonal prism structure as its base. Compared to the traditional electrode assembly's single regular cylindrical or rectangular structure, this not only flexibly adapts to irregularly shaped installation spaces, significantly improving space utilization, but also 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. Furthermore, by making the distance between two parallel first sides greater than the distance between two parallel second sides, a staggered structure is created between the first and second sides. Each first side is provided with two spaced-apart expansion protrusions, thereby... This design helps to limit and fix the battery electrode assembly to the battery casing, effectively preventing the battery electrode assembly from shifting. Secondly, by setting two conductive electrode tabs distributed on both sides of the expansion boss on each first side, the multi-tab design effectively increases the total current-carrying area and significantly improves the high-current-carrying performance of the electrode assembly. On the other hand, the split electrode tab layout avoids the problems of uneven current distribution and local overheating caused by excessively large single electrode tab area. At the same time, the surface of the conductive electrode tab away from the first side is lower than the surface of the expansion boss away from the first side, so that the conductive electrode tab has spatial overlap with the electrode assembly base, without occupying additional external space of the battery electrode assembly. Furthermore, the expansion boss protects the conductive electrode tab from damage caused by impact.

[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 schematic diagram of the battery electrode assembly provided by the present invention; Figure 2 This is a front view of the battery electrode assembly provided by the present invention; Figure 3 This is a top view of the battery electrode assembly provided by the present invention; Figure 4 yes Figure 3 Enlarged view of the structure of the middle T section; Figure 5 yes Figure 3Enlarged view of the U-shaped section.

[0019] In the picture: 1. Electrode substrate; 11. First side surface; 12. Second side surface; 13. End face; 14. Expansion boss; 2. 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] In order to provide a battery electrode assembly that achieves high energy storage capacity while having excellent space adaptability and utilization, excellent high current overcurrent performance and high volumetric capacity density, and improved fixed limiting effect, this embodiment provides a battery electrode assembly.

[0025] like Figures 1 to 5 As shown, the battery electrode assembly includes an electrode assembly base 1 and conductive electrode tabs 2. The electrode assembly base 1 includes multiple first side surfaces 11, multiple second side surfaces 12, and two oppositely arranged end surfaces 13. The end surfaces 13 are polygonal, and the sum of the multiple first side surfaces 11 and multiple second side surfaces 12 is equal to the number of sides of the end surface 13. The first side surfaces 11 and second side surfaces 12 are alternately arranged between the two end surfaces 13 to form a polygonal prism structure. The distance between the two parallel first side surfaces 11 is greater than the distance between the two parallel second side surfaces 12. Each first side surface 11 is provided with two expansion protrusions 14. The two expansion protrusions 14 are spaced apart along a first direction, which is the length direction of the expansion protrusions 14. Each first side surface 11 is provided with two conductive electrode tabs 2. The two conductive electrode tabs 2 are located on both sides of the expansion protrusions 14 along a second direction. The surface of the conductive electrode tabs 2 facing away from the first side surface 11 is lower than the surface of the expansion protrusions 14 facing away from the first side surface 11. The second direction is the width direction of the expansion protrusions 14.

[0026] This battery electrode assembly, by comprising multiple first sides 11, multiple second sides 12, and polygonal end faces 13, forms a polygonal prism structure electrode assembly base 1. Compared with the traditional electrode assembly's single regular cylindrical or rectangular structure, it can flexibly adapt to irregular installation spaces, significantly improving space utilization. Simultaneously, it expands the overall effective energy storage volume of the battery electrode assembly, achieving high energy storage capacity while avoiding the space waste problem caused by traditional overall capacity expansion methods. Furthermore, by making the distance between two parallel first sides 11 greater than the distance between two parallel second sides 12, the first sides 11 and second sides 12 form a staggered structure. Each first side 11 is provided with two spaced expansion protrusions 14, which further contributes to the battery electrode assembly's... The limiting and fixing between the battery casing and the battery electrode assembly effectively prevents the battery electrode assembly from shifting. Secondly, by setting two conductive electrode tabs 2 on each first side 11 and distributed on both sides of the expansion boss 14, the multi-tab design effectively increases the total current flow area and significantly improves the high current flow 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 the excessive area of ​​a single tab. At the same time, the surface of the conductive electrode tab 2 away from the first side 11 is lower than the surface of the expansion boss 14 away from the first side 11, so that the conductive electrode tab 2 has spatial overlap with the electrode assembly base 1, and will not occupy additional external space of the battery electrode assembly. Furthermore, the expansion boss 14 protects the conductive electrode tab 2 and prevents the conductive electrode tab 2 from being damaged by impact.

[0027] In this embodiment, both end faces 13 of the electrode substrate 1 are octagonal, so the electrode substrate 1 includes four first side faces 11 and four second side faces 12. In addition, for ease of installation, the electrode substrate 1 can be a single piece or can be composed of two symmetrical parts combined with a conductive coating, thereby facilitating assembly.

[0028] Optionally, such as Figure 4 As shown, the distance between the surface of the expansion boss 14 away from the first side 11 and the first side 11 along a third direction is H, and satisfies 12mm≤H≤80mm, where the third direction is the height direction of the expansion boss 14.

[0029] By limiting the distance H between the surface of the expansion boss 14 away from the first side 11 and the first side 11 along the third direction, it is possible to avoid the distance being too small, which would result in the expansion boss 14 being too low in height, the effective volume of the electrode substrate 1 being insufficient, and the capacity increase being unable to meet the capacity requirements; on the other hand, it is possible to avoid the distance being too large, which would result in the expansion boss 14 being too high in height, thereby occupying additional external space.

[0030] The distance H between the surface of the expansion boss 14 facing away from the first side 11 and the first side 11 along a third direction can be any value between 12mm and 80mm or any two values, such as 12mm, 29mm, 46mm, 63mm, 80mm, etc.

[0031] Optionally, such as Figure 5 As shown, the dimension of the expansion boss 14 along the second direction is L1, and the distance between the two end faces 13 along the second direction is B, which satisfies 0.2≤L1 / B≤0.55.

[0032] By limiting the ratio between the dimension L1 of the expansion boss 14 along the second direction and the distance B between the two end faces 13 along the second direction, on the one hand, the width of the expansion boss 14 is not too small, resulting in insufficient effective volume of the electrode group substrate 1 and the capacity increase cannot meet the capacity requirements; on the other hand, the width of the expansion boss 14 is not too large, resulting in insufficient space on both sides for setting the conductive electrode ears 2, which is not conducive to the connection of the conductive electrode ears 2.

[0033] The ratio between the dimension L1 in the second direction and the spacing dimension B between the two end faces 13 along the second direction can be any value between 0.2 and 0.55 or any range between two values, such as 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, etc.

[0034] Optionally, such as Figure 5As shown, the distance between the two conductive electrode ears 2 connected to the same first side 11 along the second direction is L2, and satisfies 10mm≤L2-L1≤36mm.

[0035] By limiting the difference between the spacing dimension L2 and the dimension L1 of the two conductive electrode ears 2 along the second direction, on the one hand, it is avoided that the difference is too small, causing the conductive electrode ears 2 to be too close to the expansion boss 14, making it easy for the conductive electrode ears 2 to interfere with the expansion boss 14 when setting them. On the other hand, it is avoided that the difference is too large, causing the conductive electrode ears 2 to be too far from the expansion boss 14 and too close to the edge of the electrode group substrate 1, making the conductive electrode ears 2 easy to be damaged.

[0036] The difference between the spacing L2 and the dimension L1 of the two conductive electrode ears 2 along the second direction can be any value between 10mm and 36mm or any two values, such as 10mm, 15.2mm, 20.4mm, 23mm, 25.6mm, 30.8mm, 36mm, etc.

[0037] Optionally, such as Figure 5 As shown, the spacing B between the two end faces 13 along the second direction satisfies 20mm≤B≤118mm.

[0038] By limiting the spacing B between the two end faces 13 along the second direction to satisfy 20mm≤B≤118mm, it avoids two problems: on the one hand, the spacing is too small, resulting in the electrode substrate 1 being too thin and the effective volume of the electrode substrate 1 being insufficient, so that the capacity increase cannot meet the capacity requirements; on the other hand, it avoids the spacing is too large, resulting in the electrode substrate 1 being too thick and occupying too much space, so that the battery cannot meet the installation requirements in a limited space.

[0039] The spacing dimension B between the two end faces 13 along the second direction can be any value between 20mm and 118mm or any range between two values, such as 20mm, 44.5mm, 69mm, 93.5mm, 118mm, 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 shows that when the distance H between the surface of the expansion boss 14 away from the first side 11 and the first side 11 along a third direction is less than the minimum value of the range 12mm≤H≤80mm, the height of the expansion boss 14 is too low, the effective volume of the electrode substrate 1 is insufficient, and the capacity increase cannot meet the capacity requirements; when the distance H between the surface of the expansion boss 14 away from the first side 11 and the first side 11 along a third direction is greater than the maximum value of the range 12mm≤H≤80mm, the height of the expansion boss 14 is too high, thereby occupying additional external space.

[0042] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the ratio between the dimension L1 of the expansion boss 14 along the second direction and the distance B between the two end faces 13 along the second direction is less than the minimum value in the range 0.2≤L1 / B≤0.55, the width of the expansion boss 14 is too small, resulting in insufficient effective volume of the electrode substrate 1 and the capacity increase cannot meet the capacity requirements. When the ratio between the dimension L1 of the expansion boss 14 along the second direction and the distance B between the two end faces 13 along the second direction is greater than the maximum value in the range 0.2≤L1 / B≤0.55, the width of the expansion boss 14 is too large, resulting in insufficient space on both sides for setting the conductive electrode ears 2, which is not conducive to the connection of the conductive electrode ears 2.

[0043] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the difference between the spacing L2 and the dimension L1 of the two conductive electrode ears 2 along the second direction is less than the minimum value of the range 10mm≤L2-L1≤36mm, the conductive electrode ears 2 are too close to the expansion boss 14, making it easy for them to interfere with the expansion boss 14 when the conductive electrode ears 2 are installed; when the difference between the spacing L2 and the dimension L1 of the two conductive electrode ears 2 along the second direction is greater than the maximum value of the range 10mm≤L2-L1≤36mm, the conductive electrode ears 2 are too far from the expansion boss 14 and too close to the edge of the electrode group substrate 1, making the conductive electrode ears 2 prone to damage.

[0044] Optionally, such as Figure 5 As shown, the length of the conductive electrode ear 2 along the first direction is E, and the length of the first side 11 along the first direction is W1, and the length satisfies 6mm≤W1-E≤16mm.

[0045] By limiting the difference between the length W1 of the first side 11 along the first direction and the length E of the conductive electrode ear 2 along the first direction, such that 6mm≤W1-E≤16mm is satisfied, it is possible to avoid the difference being too small, which would result in the conductive electrode ear 2 being too long and too close to the edge of the first side 11, making the conductive electrode ear 2 easily damaged. On the other hand, it is possible to avoid the difference being too large, which would result in the conductive electrode ear 2 being too short, with a small current-carrying area, and failing to meet the current-carrying requirements.

[0046] The difference between the length W1 of the first side 11 along the first direction and the length E of the conductive electrode ear 2 along the first direction can be any value between 6mm and 16mm or any range between two values, such as 6mm, 11mm, 16mm, etc.

[0047] Optionally, such as Figure 5 As shown, the distance between the two expansion bosses 14 along the first direction is W2, and satisfies 0.2≤W2 / W1≤0.4.

[0048] By limiting the ratio between the spacing W2 of the two expansion bosses 14 along the first direction and the length W1 of the first side surface 11 along the first direction, such that 0.2≤W2 / W1≤0.4, we can avoid the following: on the one hand, if the ratio is too small, the spacing between the two expansion bosses 14 will be too small, resulting in a small portion of the battery cover that is snapped between the two expansion bosses 14, poor structural strength, and easy breakage; on the other hand, we can avoid the following: if the ratio is too large, the spacing between the two expansion bosses 14 will be too large, resulting in insufficient contact area between the battery cover and the first side surface 11 on the side of the two expansion bosses 14 that is away from each other, leading to poor connection stability.

[0049] The ratio between the spacing W2 of the two expansion bosses 14 along the first direction and the length W1 of the first side surface 11 along the first direction can be any value between 0.2 and 0.4 or any range between two values, such as 0.2, 0.3, 0.4, etc.

[0050] Optionally, such as Figure 3 and Figure 5 As shown, the length dimension of the electrode substrate 1 along the first direction and the third direction is A, and satisfies 0.2≤W1 / A≤0.5.

[0051] By limiting the ratio between the length W1 of the first side 11 along the first direction and the length A of the electrode substrate 1 along the first and third directions, on the one hand, the length of the first side 11 is not too small, resulting in insufficient space for setting the conductive electrode tab 2 and the expansion boss 14. On the other hand, the length of the first side 11 is not too large, resulting in the length of the second side 12 being compressed, resulting in insufficient contact area between the battery cover and the second side 12 and poor connection stability.

[0052] The ratio between the length W1 of the first side 11 along the first direction and the length A of the pole group substrate 1 along the first direction and the third direction can be any value between 0.2 and 0.5 or any range between two values, such as 0.2, 0.3, 0.4, 0.5, etc.

[0053] 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 2, six sets of embodiments and six sets of comparative examples are provided for verification.

[0054] Table 2 A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the difference between the length W1 of the first side surface 11 along the first direction and the length E of the conductive electrode ear 2 along the first direction is less than the minimum value of the range 6mm ≤ W1 - E ≤ 16mm, the conductive electrode ear 2 is too long and too close to the edge of the first side surface 11, making it easy to damage. When the difference between the length W1 of the first side surface 11 along the first direction and the length E of the conductive electrode ear 2 along the first direction is greater than the maximum value of the range 6mm ≤ W1 - E ≤ 16mm, the conductive electrode ear 2 is too short, the current-carrying area is small, and it does not meet the current requirements.

[0055] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 reveals that when the ratio of the distance W2 between the two expansion bosses 14 along the first direction to the length W1 of the first side surface 11 along the first direction is less than the minimum value in the range 0.2 ≤ W2 / W1 ≤ 0.4, the distance between the two expansion bosses 14 is too small, the portion of the battery cover that is snapped between the two expansion bosses 14 is too small, the structural strength is poor, and it is prone to breakage. When the ratio of the distance W2 between the two expansion bosses 14 along the first direction to the length W1 of the first side surface 11 along the first direction is greater than the maximum value in the range 0.2 ≤ W2 / W1 ≤ 0.4, the distance between the two expansion bosses 14 is too large, resulting in insufficient contact area between the battery cover and the first side surface 11 on the side opposite to each other of the two expansion bosses 14, leading to poor connection stability.

[0056] A comparison of Examples 7 to 12 with Comparative Examples 11 to 12 reveals that when the ratio of the length W1 of the first side surface 11 along the first direction to the length A of the electrode substrate 1 along the first and third directions is less than the minimum value in the range 0.2 ≤ W1 / A ≤ 0.5, the length of the first side surface 11 is too small, resulting in insufficient space for the first side surface 11 to accommodate the conductive electrode tabs 2 and the expansion boss 14. When the ratio of the length W1 of the first side surface 11 along the first direction to the length A of the electrode substrate 1 along the first and third directions is greater than the maximum value in the range 0.2 ≤ W1 / A ≤ 0.5, the length of the first side surface 11 is too large, resulting in the compression of the length of the second side surface 12, which leads to insufficient contact area between the battery cover and the second side surface 12, resulting in poor connection stability.

[0057] Optionally, such as Figure 2 As shown, two adjacent first sides 11 are perpendicular to each other, and / or two adjacent second sides 12 are perpendicular to each other. By making the two adjacent first sides 11 perpendicular to each other, it is convenient to connect the conductive electrode tabs 2 on the first side 11 to the battery cover. By making the two adjacent second sides 12 perpendicular to each other, the electrode assembly substrate 1 is a regular octagon, which facilitates processing and manufacturing.

[0058] 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.

[0059] 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: The electrode assembly substrate includes multiple first side surfaces, multiple second side surfaces, and two oppositely arranged end surfaces. The end surfaces are polygonal, and the sum of the multiple first side surfaces and the multiple second side surfaces is equal to the number of sides of the end surface. The first side surfaces and the second side surfaces are alternately arranged between the two end surfaces to form a polygonal prism structure. The distance between two parallel first side surfaces is greater than the distance between two parallel second side surfaces. Each first side surface is provided with two expansion bosses, and the two expansion bosses are spaced apart along a first direction, which is the length direction of the expansion bosses. The conductive electrode tabs are provided on each of the first side surfaces. The two conductive electrode tabs are respectively located on both sides of the expansion boss along the second direction. The surface of the conductive electrode tab away from the first side surface is lower than the surface of the expansion boss away from the first side surface. The second direction is the width direction of the expansion boss.

2. The battery electrode assembly according to claim 1, characterized in that, The distance between the surface of the expansion boss away from the first side and the first side along a third direction is H, and satisfies 12mm≤H≤80mm, where the third direction is the height direction of the expansion boss.

3. The battery electrode assembly according to claim 1, characterized in that, The dimension of the expansion boss along the second direction is L1, and the distance between the two end faces along the second direction is B, satisfying 0.2≤L1 / B≤0.

55.

4. The battery electrode assembly according to claim 3, characterized in that, The distance between the two conductive electrode ears connected to the same first side along the second direction is L2, and satisfies 10mm≤L2-L1≤36mm.

5. The battery electrode assembly according to claim 3, characterized in that, The spacing B between the two end faces along the second direction satisfies 20mm≤B≤118mm.

6. The battery electrode assembly according to claim 1, characterized in that, The length of the conductive electrode ear along the first direction is E, and the length of the first side along the first direction is W1, and both satisfy 6mm≤W1-E≤16mm.

7. The battery electrode assembly according to claim 6, characterized in that, The distance between the two expansion bosses along the first direction is W2, and satisfies 0.2≤W2 / W1≤0.

4.

8. The battery electrode assembly according to claim 6, characterized in that, The length dimension of the electrode substrate along the first direction and the third direction is A, and satisfies 0.2≤W1 / A≤0.

5.

9. The battery electrode assembly according to claim 1, characterized in that, The two adjacent first sides are perpendicular to each other, and / or the two adjacent second sides are perpendicular to each other.

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.

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