A battery cell
Patent Information
- Application Number
- CN202610935375.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-26
- Publication Date
- 2026-09-15
Smart Images
Figure CN122762771A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and more particularly to a single battery cell. Background Technology
[0002] As new types of electrical equipment such as drones and unmanned vehicles are gradually being used more widely, the market demands for their battery life and fast charging capabilities are increasing. At the same time, the structural design of such electrical equipment is complex, and the installation space reserved for batteries is often an irregular shape such as an X-shape.
[0003] However, existing batteries are usually square or rectangular in structure, which limits their capacity because they cannot make full use of the X-shaped installation space, thus limiting their range and fast charging capabilities.
[0004] Therefore, there is an urgent need to propose a new type of battery cell to solve the above-mentioned technical problems. Summary of the Invention
[0005] The purpose of this invention is to provide a battery cell that can make full use of the X-shaped mounting space and also increase the volume of the electrode assembly.
[0006] To achieve this objective, the present invention adopts the following technical solution: A single battery cell, comprising: The electrode group has a thickness direction in the first direction. The electrode group includes a first electrode group body and four second electrode group bodies. The four second electrode group bodies are paired up to form two inclined electrode group components. The two inclined electrode group components are located on both sides of the first electrode group body along the second direction. The two second electrode group bodies in the same inclined electrode group component are respectively connected to both sides of the first electrode group body along the third direction. One of the two inclined electrode group components is inclined in a direction away from the other. The two second electrode group bodies of the inclined electrode group component are inclined in a direction away from each other. The first direction, the second direction and the third direction are perpendicular to each other. The shell structure conforms to the shape of the electrode assembly, which is located within the shell structure.
[0007] Optionally, the first pole group body is provided with four first connecting parts, and each second pole group body is provided with a second connecting part. The second connecting parts of the four second pole group bodies correspond one-to-one with the four first connecting parts, and the second connecting part of each second pole group body is respectively inserted and engaged with a corresponding first connecting part.
[0008] Optionally, the housing structure includes a battery housing, which includes a first housing and four second housings. The first housing has a first opening on at least one side along a second direction. The four second housings are grouped in pairs to form two inclined housing groups. The two inclined housing groups are located on both sides of the first housing along the second direction. The two second housings in the same inclined housing group are respectively connected to the two sides of the first housing along a third direction. Each second housing has a second opening on the side away from the first housing. The first electrode group body can enter the first housing through the first opening. The four second electrode group bodies correspond one-to-one with the four second housings. Each second electrode group body can enter the corresponding second housing through the second opening of the corresponding second housing.
[0009] Optionally, a sealing plate is provided at the first opening, and the shell structure also includes four cover plate assemblies, which correspond one-to-one with four second shells, with each cover plate assembly covering the second opening of a corresponding second shell.
[0010] Optionally, the second electrode assembly body has a capacity-enhancing part protruding on the side opposite to the first electrode assembly body, and each cover plate assembly has a limiting groove on the side facing the corresponding second electrode assembly body. The capacity-enhancing part on each second electrode assembly body is insulated and embedded in the corresponding limiting groove.
[0011] Optionally, the second electrode assembly body is provided with an electrode tab on the side opposite to the first electrode assembly body, and the capacity-enhancing part is provided with electrode tabs on both sides along the first direction on the same second electrode assembly body.
[0012] Optionally, along a third direction, the side of one of the two second pole groups located on the same side of the first pole group body facing the other is the first side of the second pole group body. Along a third direction, the side of one of the two second pole groups located on the same side of the first pole group body away from the other is the second side of the second pole group body. In the same second pole group body, the dimension of the expansion part in the direction from the first side to the second side is L1, and the dimension of the second pole group body in the direction from the first side to the second side is A, where 0.26≤L1 / A≤0.84.
[0013] Optionally, the dimension of the first pole group body along the second direction is F, and the distance between the two first connecting parts on the same side of the first pole group body along the third direction and facing each other in the second direction is M, where 0.09≤M / F≤0.39.
[0014] Optionally, the dimension of the electrode group along the second direction is E2, and the dimension of the first electrode group body along the second direction is F, where 41mm≤E2-F≤219mm.
[0015] Optionally, the first electrode assembly body has four conductive layer structures, which correspond one-to-one with the four second electrode assembly bodies. Each conductive layer structure includes a first conductive layer and a second conductive layer. The first and second conductive layers are spaced apart and have opposite polarities. Both the first and second conductive layers are electrically connected to the first electrode assembly body. The second electrode assembly body has a third conductive layer and a fourth conductive layer on the side facing the first electrode assembly body. The third and fourth conductive layers are spaced apart and have opposite polarities. Both the third and fourth conductive layers are electrically connected to the second electrode assembly body. The third conductive layer of each second electrode assembly body is attached to the first conductive layer of a corresponding conductive layer structure, and the fourth conductive layer of each second electrode assembly body is attached to the second conductive layer of a corresponding conductive layer structure.
[0016] The beneficial effects of this invention are: The battery cell includes an electrode assembly and a housing structure. The electrode assembly includes a first electrode assembly body and four second electrode assembly bodies. The four second electrode assembly bodies are paired up to form two tilted electrode assembly components. The two tilted electrode assembly components are located on both sides of the first electrode assembly body along a second direction. The two second electrode assembly bodies in the same tilted electrode assembly are respectively connected to both sides of the first electrode assembly body along a third direction. One of the two tilted electrode assembly components is tilted away from the other, and the two second electrode assembly bodies of the tilted electrode assembly are tilted in a direction away from each other, thereby making the electrode assembly roughly X-shaped. Based on this, the housing structure imitates the shape of the electrode assembly, that is, the housing structure is also roughly X-shaped, thus making the battery cell roughly X-shaped. This allows the battery cell to be installed in the X-shaped installation space, so that the battery cell can make full use of the X-shaped installation space, thereby achieving the effect of increasing the electrode assembly volume and increasing the electrode assembly capacity, which is beneficial to improving the battery cell's range and fast charging capability. Attached Figure Description
[0017] Figure 1 This is a schematic diagram of the first structure of the pole assembly provided by the present invention; Figure 2 This is a schematic diagram of the structure of a battery cell provided by the present invention; Figure 3 This is a schematic diagram of the first structure of the second pole group body provided by the present invention; Figure 4 This is a schematic diagram of the second structure of the second pole group body provided by the present invention; Figure 5 This is a schematic diagram of the structure of the first pole group body provided by the present invention; Figure 6 This is a schematic diagram of the battery casing provided by the present invention; Figure 7 This is a schematic cross-sectional view of the battery cell provided by the present invention; Figure 8This is a schematic diagram of the third structure of the second pole group body provided by the present invention; Figure 9 This is a schematic diagram of the structure of the cover plate assembly provided by the present invention; Figure 10 yes Figure 11 A schematic diagram of the N-direction view structure; Figure 11 This is a schematic diagram of the second structure of the pole group provided by the present invention; Figure 12 yes Figure 11 MM direction sectional view.
[0018] In the picture: D1, First direction; D2, Second direction; D3, Third direction; 11, First electrode group body; 111, First connecting part; 112, Conductive layer structure; 1121, First conductive layer; 1122, Second conductive layer; 12, Second electrode group body; 121, Second connecting part; 122, Capacitance enhancement part; 123, Electrode tab; 1231, First electrode tab; 1232, Second electrode tab; 1241, First side; 1242, Second side; 1243, Third side; 1244 1251. Fourth side; 1252. Third conductive layer; 1253. Fourth conductive layer; 126. Slope; 1271. Plane; 1272. Inclined surface; 13. Inclined electrode assembly; 14. Corner; 211. First housing; 2111. First opening; 2112. Housing part; 212. Second housing; 2121. Second opening; 213. Inclined housing assembly; 214. Sealing plate; 22. Cover plate assembly; 221. Cover plate; 2211. Protrusion; 222. External conductive structure. Detailed Implementation
[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the drawings, not the entire structure. It is understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.
[0020] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0021] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0022] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.
[0023] This embodiment provides a battery cell that can make full use of the X-shaped mounting space and also increase the volume of the electrode assembly.
[0024] Specifically, such as Figure 1 and Figure 2 As shown, the battery cell includes an electrode assembly and a housing structure. The thickness direction of the electrode assembly is the first direction D1. The electrode assembly includes a first electrode assembly body 11 and four second electrode assembly bodies 12. The four second electrode assembly bodies 12 are paired up to form two inclined electrode assembly components 13. The two inclined electrode assembly components 13 are located on both sides of the first electrode assembly body 11 along the second direction D2. The two second electrode assembly bodies 12 in the same inclined electrode assembly component 13 are respectively connected to both sides of the first electrode assembly body 11 along the third direction D3. One of the two inclined electrode assembly components 13 is inclined in a direction away from the other. The two second electrode assembly bodies 12 of the inclined electrode assembly component 13 are inclined in a direction away from each other. The first direction D1, the second direction D2, and the third direction D3 are perpendicular to each other. The housing structure is modeled after the shape of the electrode assembly, and the electrode assembly is disposed inside the housing structure.
[0025] Based on the above design, the battery cell includes an electrode assembly and a housing structure. The electrode assembly includes a first electrode assembly body 11 and four second electrode assembly bodies 12. The four second electrode assembly bodies 12 are paired to form two inclined electrode assembly components 13. The two inclined electrode assembly components 13 are located on both sides of the first electrode assembly body 11 along the second direction D2. The two second electrode assembly bodies 12 in the same inclined electrode assembly component 13 are respectively connected to both sides of the first electrode assembly body 11 along the third direction D3. One of the two inclined electrode assembly components 13 is inclined away from the other. The two second electrode assembly bodies 12 of the inclined electrode assembly component 13 are inclined in a direction away from each other, thereby making the electrode assembly roughly X-shaped. Based on this, the housing structure imitates the shape of the electrode assembly, that is, the housing structure is also roughly X-shaped, thus making the battery cell roughly X-shaped. This allows the battery cell to be installed in the X-shaped installation space, so that the battery cell can make full use of the X-shaped installation space, thereby achieving the effect of increasing the electrode assembly volume and increasing the electrode assembly capacity, which is beneficial to improving the battery cell's range and fast charging capability.
[0026] Furthermore, such as Figures 1 to 3 As shown, the first pole group body 11 has a rectangular structure. Along the third direction D3, the side of one of the two second pole group bodies 12 located on the same side of the first pole group body 11 facing the other is the first side 1241 of that second pole group body 12. Along the third direction D3, the side of one of the two second pole group bodies 12 located on the same side of the first pole group body 11 away from the other is the second side 1242 of that second pole group body 12. The side of the second pole group body 12 facing the first pole group body 11 is the third side 1243 of that second pole group body 12, and the side of the second pole group body 12 away from the first pole group body 11 is the fourth side 1244 of that second pole group body 12. The surface of the second pole group body 12 facing the first pole group body 11 is a slope 126. On the same second pole group body 12, the slope 126 is inclined from the first side 1241 to the second side 1242 in the direction from the third side 1243 to the fourth side 1244, and the slope 126 of each second pole group body 12 is parallel to the side wall of the first pole group body 11 facing the third direction D3. This forms a structure in which one of the two inclined pole group assemblies 13 is inclined away from the other, and the two second pole group bodies 12 of the inclined pole group assembly 13 are inclined in a direction away from each other.
[0027] Optionally, such as Figures 1 to 5As shown, the first electrode assembly body 11 has four first connecting parts 111, and each second electrode assembly body 12 has one second connecting part 121. The second connecting parts 121 of the four second electrode assembly bodies 12 correspond one-to-one with the four first connecting parts 111, and each second connecting part 121 of the second electrode assembly body 12 is inserted and engaged with a corresponding first connecting part 111. That is to say, the four second electrode assembly bodies 12 and the first electrode assembly body 11 are separate structures. In actual production, the four second electrode assembly bodies 12 and the first electrode assembly body 11 can be produced separately, and then assembled together. Compared with the integrated electrode assembly structure, this separate structure not only reduces the difficulty of electrode assembly production, but also improves the production efficiency of the electrode assembly. On the other hand, since the pole group is roughly X-shaped, that is, one of the two tilted pole group components 13 is tilted away from the other, and the two second pole group bodies 12 of the tilted pole group component 13 are tilted away from each other, corners 14 are formed at the positions where each second pole group body 12 connects to the first pole group body 11 on both sides facing the second direction D2. If the pole group is a one-piece structure, the stress will be concentrated in the corner 14 area, making the corner 14 area prone to breakage. In this embodiment, the pole group is a split structure, which can significantly reduce the stress concentrated in the corner 14 area, thereby improving the reliability of the connection between the second pole group body 12 and the first pole group body 11 and providing a strong guarantee for the overall structural strength of the pole group. Furthermore, the first pole group body 11 and the second pole group body 12 are connected by the insertion and cooperation of the first connecting part 111 and the second connecting part 121, which helps to improve the assembly accuracy of the first pole group body 11 and the second pole group body 12, thereby improving the assembly yield of the pole group.
[0028] In this embodiment, the first connecting part 111 is a slot and the second connecting part 121 is a plug. Of course, in other embodiments, the first connecting part 111 can also be a plug and the second connecting part 121 can be a slot.
[0029] Furthermore, the second connecting portion 121 of each second pole group body 12 is respectively fitted with a corresponding first connecting portion 111 with a clearance, so that the second pole group body 12 can move within a small range relative to the first pole group body 11, thereby further reducing the stress in the corner 14 area and further improving the overall structural strength of the pole group.
[0030] In this embodiment, the four first connecting parts 111 are grouped in pairs. The two groups of first connecting parts 111 are located on the two side walls of the first pole body 11 along the third direction D3. The two first connecting parts 111 located on the same side of the first pole body 11 along the third direction D3 (i.e., the two first connecting parts 111 in the same group) are arranged opposite each other and spaced apart along the second direction D2.
[0031] Optionally, the first electrode group body 11 is provided with four conductive layer structures 112, which correspond one-to-one with four second electrode group bodies 12. Each conductive layer structure 112 includes a first conductive layer 1121 and a second conductive layer 1122. The first conductive layer 1121 and the second conductive layer 1122 are spaced apart and have opposite polarities. Both the first conductive layer 1121 and the second conductive layer 1122 are electrically connected to the first electrode group body 11. The second electrode group body 12 has a third conductive layer 1251 and a fourth conductive layer 1252 on the side facing the first electrode group body 11. Three conductive layers 1251 and a fourth conductive layer 1252 are spaced apart and have opposite polarities. Both the third conductive layer 1251 and the fourth conductive layer 1252 are conductively connected to the second electrode assembly body 12. The third conductive layer 1251 of each second electrode assembly body 12 is attached to the first conductive layer 1121 of a corresponding conductive layer structure 112, and the fourth conductive layer 1252 of each second electrode assembly body 12 is attached to the second conductive layer 1122 of a corresponding conductive layer structure 112. This achieves a conductive connection between the second electrode assembly body 12 and the first electrode assembly body 11. This structure eliminates the need for conductive components such as busbars between the second electrode assembly body 12 and the first electrode assembly body 11, achieving a conductive connection using only conductive layers. This saves internal space in the battery casing, reduces the weight of individual battery cells, and consequently improves the energy density of individual battery cells.
[0032] The first conductive layer 1121, the second conductive layer 1122, the third conductive layer 1251 and the fourth conductive layer 1252 mentioned above can be conductive layers that are common in the art, such as graphene conductive layer, indium tin oxide conductive layer or silver nano conductive film layer, and will not be listed here.
[0033] In this embodiment, the first conductive layer 1121 and the third conductive layer 1251 are both positive conductive layers, and the second conductive layer 1122 and the fourth conductive layer 1252 are both negative conductive layers. The first electrode assembly body 11 includes a first positive electrode sheet, a first separator, and a first negative electrode sheet. In the region of the first electrode assembly body 11 facing the first conductive layer 1121, the first positive electrode sheet protrudes from the first negative electrode sheet and contacts the first conductive layer 1121 to achieve electrical connection between the first positive electrode sheet and the first conductive layer 1121. In the region of the first electrode assembly body 11 facing the second conductive layer 1122, the first negative electrode sheet protrudes from the first positive electrode sheet and contacts the second conductive layer 1122 to achieve electrical connection between the first negative electrode sheet and the second conductive layer 1122. Thus, both the first conductive layer 1121 and the second conductive layer 1122 are electrically connected to the first electrode assembly body 11. Similarly, the second electrode assembly body 12 includes a second positive electrode, a second separator, and a second negative electrode. In the region of the second electrode assembly body 12 facing the third conductive layer 1251, the second positive electrode protrudes from the second negative electrode and contacts the third conductive layer 1251 to achieve electrical connection between the second positive electrode and the third conductive layer 1251. In the region of the second electrode assembly body 12 facing the fourth conductive layer 1252, the second negative electrode protrudes from the second positive electrode and contacts the fourth conductive layer 1252 to achieve electrical connection between the second negative electrode and the fourth conductive layer 1252. Thus, both the third conductive layer 1251 and the fourth conductive layer 1252 are electrically connected to the second electrode assembly body 12. Of course, in other embodiments, the first conductive layer 1121 and the third conductive layer 1251 can both be negative conductive layers, and the second conductive layer 1122 and the fourth conductive layer 1252 can both be positive conductive layers.
[0034] In this embodiment, four conductive layer structures 112 correspond one-to-one with four first connecting portions 111. The first conductive layer 1121 and the second conductive layer 1122 in each conductive layer structure 112 are respectively located on both sides of the corresponding first connecting portion 111 along the first direction D1, ensuring that the first conductive layer 1121 and the second conductive layer 1122 in the same conductive layer structure 112 are absolutely spaced apart, avoiding internal short circuits in the first electrode group body 11. On the same second electrode group body 12, the third conductive layer 1251 and the fourth conductive layer 1252 are respectively located on both sides of the second connecting portion 121 along the first direction D1, ensuring that the third conductive layer 1251 and the fourth conductive layer 1252 on the same second electrode group body 12 are spaced apart, avoiding internal short circuits in the second electrode group body 12.
[0035] Optionally, such as Figures 1 to 6As shown, the housing structure includes a battery housing, which includes a first housing 211 and four second housings 212. The first housing 211 has a first opening 2111 on at least one side along the second direction D2. The four second housings 212 are paired up to form two inclined housing groups 213. The two inclined housing groups 213 are located on both sides of the first housing 211 along the second direction D2. The two second housings 212 in the same inclined housing group 213 are respectively connected to both sides of the first housing 211 along the third direction D3. One of the two inclined housing groups 213 is inclined away from the other. The two second housings 212 of the inclined housing group 213 are inclined in a direction away from each other. The cavities of the four second housings 212 are all connected to the cavities of the first housing 211, thereby forming an X-shaped battery housing with X-shaped cavities. Each second housing 212 has a second opening 2121 on the side opposite to the first housing 211. The first electrode assembly body 11 can enter the first housing 211 through the first opening 2111. The four second electrode assembly bodies 12 correspond one-to-one with the four second housings 212, and each second electrode assembly body 12 can enter the corresponding second housing 212 through the second opening 2121. When the X-shaped electrode assembly is installed into the X-shaped battery case, the first electrode assembly body 11 is installed into the first housing 211 through the first opening 2111, and then the four second electrode assembly bodies 12 are installed into the corresponding second housings 212 through their respective second openings 2121. During the installation of the second electrode assembly body 12, the first connecting part 111 and the second connecting part 121 are inserted and engaged, thereby completing the connection between the first electrode assembly body 11 and the second electrode assembly body 12 while completing the installation of the electrode assembly. It is evident that the separate structural design of the first electrode group body 11 and the four second electrode group bodies 12 can reduce the difficulty of assembling the electrode group into the battery case, and the structural design of the first connecting part 111 and the second connecting part 121 can also improve the assembly efficiency of the first electrode group body 11, the battery case and the four second electrode group bodies 12.
[0036] In this embodiment, the first housing 211 has a first opening 2111 on both sides along the second direction D2. When the first electrode assembly body 11 is installed into the first housing 211, the first electrode assembly body 11 can be installed into one of the two first openings 2111 according to the working conditions. Of course, in other embodiments, the first housing 211 may also have a first opening 2111 on one side along the second direction D2.
[0037] Furthermore, a sealing plate 214 is provided at the first opening 2111, and the shell structure also includes four cover plate assemblies 22, which correspond one-to-one with four second shells 212. Each cover plate assembly 22 is respectively covered at the second opening 2121 of a corresponding second shell 212 to provide a sealed space for the electrode assembly.
[0038] Optionally, such as Figures 1 to 7As shown, the second electrode assembly 12 has a capacity-enhancing portion 122 protruding from the side opposite to the first electrode assembly 11. Each cover plate assembly 22 has a limiting groove on the side facing the corresponding second electrode assembly 12, and the capacity-enhancing portion 122 on each second electrode assembly 12 is insulated and embedded in the corresponding limiting groove. On the one hand, the capacity-enhancing portion 122 protruding from the side of the second electrode assembly 12 opposite to the first electrode assembly 11 can increase the electrode assembly volume, thereby increasing the electrode assembly capacity and improving the battery cell's range and fast charging capability. On the other hand, the capacity-enhancing portion 122 of each second electrode group body 12 is insulated and embedded in the limiting groove of a corresponding cover plate assembly 22, thereby enabling the limiting groove to provide a limiting effect for the corresponding capacity-enhancing portion 122. That is, each cover plate assembly 22 can provide a limiting effect for a corresponding second electrode group body 12. Since the second connecting portion 121 of the second electrode group body 12 is inserted and engaged with the first connecting portion 111 of the first electrode group body 11, the four cover plate assemblies 22 can also jointly provide a limiting effect for the first electrode group body 11. This can reduce the probability of the electrode group shifting in the battery case, which is beneficial to improving the reliability and safety of the battery cell.
[0039] Optionally, the second electrode group body 12 is further provided with tabs 123 on the side opposite to the first electrode group body 11. On the same second electrode group body 12, the capacity-enhancing portion 122 is provided with tabs 123 on both sides along the first direction D1. In this embodiment, the capacity-enhancing portion 122 is provided with one tab 123 on each side along the first direction D1. Of course, in other embodiments, the capacity-enhancing portion 122 may be provided with one, two, three or more tabs 123 on each side along the first direction D1. This structure ensures that each second electrode group body 12 is provided with at least two tabs 123, and the tabs 123 on the same second electrode group body 12 are distributed on both sides of the capacity-enhancing portion 122 of the second electrode group body 12, that is, the electrode group is provided with at least eight tabs 123, and these tabs 123 are distributed on four second electrode group bodies 12. It is evident that this structure significantly increases the number of tabs 123 and allows the multiple tabs 123 to be more dispersed on the electrode assembly. The increase in the number of tabs 123 can increase the flow rate between the electrode assembly and the cover plate assembly 22, which is beneficial to meeting the high-rate fast charging requirements of the battery cells. The dispersed distribution of the tabs 123 helps to improve the heat dissipation efficiency of the tabs 123 and avoids the problem of heat concentration during fast charging, which is beneficial to improving the safety of the battery cells.
[0040] Furthermore, such as Figures 1 to 8As shown, the surface of the second electrode assembly body 12 facing away from the first electrode assembly body 11 includes a plane 1271 and two inclined planes 1272. On the same second electrode assembly body 12, the two inclined planes 1272 are respectively connected to the side of the plane 1271 facing the first side 1241 and the side of the plane 1271 facing the second side 1242, and the distance between the two inclined planes 1272 gradually increases along the direction from the third side 1243 to the fourth side 1244. The capacity-enhancing part 122 protrudes from the plane 1271, and the two sides of the capacity-enhancing part 122 extend to the two inclined planes 1272 respectively. This increases the volume of the second electrode assembly body 12 (the part on the side of the two inclined planes 1272 facing away from each other is the increased area of the second electrode assembly body 12) and the volume of the capacity-enhancing part 122, which is beneficial to improving the increase in electrode assembly volume and capacity.
[0041] The tab 123 includes a first tab portion 1231 and two second tab portions 1232. On the same second electrode group body 12, the first tab portion 1231 is located on a plane 1271, and both second tab portions 1232 are connected to the first tab portion 1231, and the two second tab portions 1232 are respectively located on two inclined planes 1272. This structure can increase the extension length of a single tab 123, which is beneficial to improving the heat dissipation capacity of the tab 123 for current carrying capacity.
[0042] Optionally, such as Figures 1 to 9 As shown, the cover plate assembly 22 includes a cover plate 221, an external conductive structure 222, and an internal conductive plate (not shown). The cover plate 221 covers the second opening 2121. The external conductive structure 222 is located on the side of the cover plate 221 facing away from the second opening 2121 and is used for welding to a busbar (not shown). The internal conductive plate is located on the side of the cover plate 221 facing the second opening 2121 and is welded to the tab 123, thereby realizing the conductive connection between the electrode group and the busbar. The cover plate 221 has a protrusion 2211, which protrudes in the direction away from the second opening 2121 to form a limiting groove on the side of the protrusion 2211 facing the second opening 2121. The protrusion 2211 passes through the external conductive structure 222, and protrudes from the external conductive structure 222 and the busbar along the protrusion direction of the protrusion 2211, so that the protrusion 2211 can protect the external conductive structure 222 and the busbar, and reduce the probability of the external conductive structure 222 and the busbar being bumped during the manufacturing process.
[0043] Optionally, along the third direction D3, the side of one of the two second pole group bodies 12 located on the same side of the first pole group body 11 facing the other is the first side 1241 of the second pole group body 12. Along the third direction D3, the side of one of the two second pole group bodies 12 located on the same side of the first pole group body 11 away from the other is the second side 1242 of the second pole group body 12. In the same second pole group body 12, the dimension of the expansion portion 122 along the direction from the first side 1241 to the second side 1242 is L1, and the dimension of the second pole group body 12 along the direction from the first side 1241 to the second side 1242 is A, where 0.26 ≤ L1 / A ≤ 0.84. For example, L1 / A can be 0.26, 0.33, 0.51, 0.65, 0.75, or 0.84, etc. If L1 / A is less than 0.26, then L1 is too small, which will result in the volume of the capacity-enhancing section 122 being too small, thereby reducing the increase in electrode assembly volume and capacity, which is not conducive to meeting the high-rate fast charging requirements of individual battery cells. If L1 / A is greater than 0.84, then L1 is too large, which will result in the dimensions of the limiting groove and protrusion 2211 on the cover plate 221 being too large in the direction from the first side 1241 to the second side 1242 corresponding to the cover plate 221, that is, the dimensions of the limiting groove and protrusion 2211 along the direction from the first side 1241 to the second side 1242 of the cover plate 221 are too large. Figure 9 If the dimension in the x-direction is too large, since the protrusion 2211 passes through the external conductive structure 222, the distance between the two sides of the external conductive structure 222 and the protrusion 2211 in the x-direction will be too small. This will result in an excessively narrow area (hereinafter referred to as the "too narrow area") between the two sides of the external conductive structure 222 and the protrusion 2211 in the x-direction. This not only makes the too narrow area prone to deformation and damage due to insufficient strength, but also reduces the current carrying capacity of the external conductive structure 222. In addition, the limiting groove and the protrusion 2211 along the x-direction... Figure 9 If the size in the x-direction is too large, it will increase the molding difficulty of the cover plate 221, which will in turn reduce the production yield and production efficiency of the cover plate 221.
[0044] Optionally, the dimension of the first pole group body 11 along the second direction D2 is F, and the distance between the two first connecting portions 111 located on the same side of the first pole group body 11 along the third direction D3 and facing each other on the second direction D2 is M, where 0.09 ≤ M / F ≤ 0.39. For example, M / F can be 0.09, 0.12, 0.28, 0.35, or 0.39, etc. If M / F is less than 0.09, then M is too small, and consequently, the dimension of the first connecting portion 111 along the second direction D2 is too large. When the first connecting portion 111 is a slot, the structural strength of the second pole group body 12 will be reduced due to the excessive dimension of the first connecting portion 111 along the second direction D2. In addition, to reduce the manufacturing difficulty of the battery case, in this embodiment, the first housing 211 includes two housing parts 2112, and the two housing parts 2112 correspond one-to-one with two inclined housing groups 213. Each housing part 2112 and its corresponding inclined housing group 213 are integral structures (hereinafter, a housing part 2112 and the inclined housing group 213 corresponding to the housing part 2112 are referred to as a housing unit). In actual production, two housing units can be produced separately by stamping and / or bending processes, and then the housing parts 2112 of the two housing units are spliced and welded together to form an X-shaped battery case. If M is too small, the minimum spacing between the two second electrode body bodies 12 located on the same side of the first electrode body 11 along the third direction D3 and along the second direction D2 will be too small. Furthermore, the minimum spacing J between the two second housings 212 located on the same side of the first housing 211 along the second direction D2 will also be too small. Consequently, when welding the housing portions 2112 of the two housing units together, the second housing 212 will interfere with the welding operations on both sides of the housing portion 2112 along the third direction D3, increasing the welding difficulty and thus reducing welding yield and efficiency. If M / F is greater than 0.39, then M is too large, resulting in the first connecting portion 111 having a too small dimension along the second direction D2. This will cause the second connecting portion 121 to have a too small dimension along the second direction D2. When the electrode group's dimension E2 along the second direction D2 remains unchanged, the dimension A of each second electrode body 12 along its first side 1241 pointing to its second side 1242 will be too small. This will reduce the increase in electrode group volume and capacity, thus hindering the ability to meet the high-rate fast charging requirements of individual battery cells.
[0045] Optionally, such as Figures 1 to 10As shown, the dimension of the electrode assembly along the second direction D2 is E2, and the dimension of the first electrode assembly body 11 along the second direction D2 is F, where 41mm ≤ E2 - F ≤ 219mm. For example, E2 - F can be 41mm, 50mm, 130mm, 200mm, or 219mm, etc. If E2 - F is less than 41mm, then along the second direction D2, the two second electrode assembly bodies 12 located on the same side of the first electrode assembly body 11 will protrude too little from the first electrode assembly body 11 on that side. This will reduce the increase in electrode assembly volume and capacity, thus hindering the ability to meet the high-rate fast charging requirements of individual battery cells. If E2-F is greater than 219mm, then along the second direction D2, the two second electrode bodies 12 located on the same side of the first electrode body 11 will protrude too much from the first electrode body 11. This will increase the risk of damage, scratches or deformation of the second electrode bodies 12 during the manufacturing process. In addition, when E2-F is greater than 219mm, along the second direction D2, the two second housings 212 located on the same side of the first housing 211 will protrude too much from the first housing 211. This will increase the difficulty of molding the battery case, and thus reduce the production yield and production efficiency of the battery case.
[0046] Optionally, on the same second electrode assembly body 12, the distance between the side of the inclined surface 1272 facing away from the plane 1271 and the side of the capacity-enhancing part 122 facing away from the second electrode assembly body 12 is H, where 12mm≤H≤70mm. For example, H can be 12mm, 55mm, or 70mm, etc., to ensure that the capacity-enhancing part 122 has sufficient volume and structural strength.
[0047] Optionally, such as Figures 1 to 12 As shown, the size of the electrode group along the first direction D1 is B (the size of the first electrode group body 11 and the second electrode group body 12 along the first direction D1 is both B), and the size of the capacity expansion part 122 along the first direction D1 is W1, 0.25≤W1 / B≤0.4. For example, W1 / B can be 0.25, 0.3 or 0.4, etc.
[0048] Optionally, 24mm≤B≤120mm, for example, B can be 24mm, 100mm or 120mm, etc.
[0049] Optionally, along the third direction D3, the minimum distance between the two second pole body bodies 12 located on the same side of the first pole body body 11 along the second direction D2 is S, 6mm≤SM≤16mm. For example, SM can be 6mm, 10mm or 16mm, etc.
[0050] Optionally, along the third direction D3, the included angle between the two second pole body bodies 12 located on the same side of the first pole body body 11 is N, 30°≤N≤90°. For example, N can be 30°, 55° or 90°, etc.
[0051] Optionally, the size of the first pole group body 11 along the third direction D3 is K, and the size of the pole group along the third direction D3 is E1, where 0.2≤K / E1≤0.4. For example, K / E1 can be 0.2, 0.3, or 0.4, etc.
[0052] In this embodiment, the first electrode body 11 and the second electrode body 12 are both made by winding (or stacking), die-cutting and laser cutting processes. The winding, stacking, die-cutting and laser cutting processes are all common production processes in the field, which are conducive to realizing mass automated production.
[0053] Table 1 below provides six sets of examples and six sets of comparative examples. The battery casings in the six sets of examples and six sets of comparative examples are all made of aluminum, and the insulating film wrapped around the outer surface of the electrode group is all polypropylene (PP) film. In Example 1, H is 12mm, L1 / A is 0.33, W1 / B is 0.25, M / F is 0.12, SM is 6mm, K / E1 is 0.2, E2-F is 50mm, N is 30°, and B is 24mm. The yield rate of the battery cells is >98%. No problems were found with low electrode structure strength or abnormal battery cell assembly. The tabs 1, 2, and 3, as well as the electrode assembly, showed no damage or deformation. The capacity, assembly, and temperature of the battery cells all met the requirements for battery cells.
[0054] In Example 2, H is 24mm, L1 / A is 0.44, W1 / B is 0.28, M / F is 0.17, SM is 8mm, K / E1 is 0.24, E2-F is 71mm, N is 45°, and B is 38mm. The yield rate of the battery cells is >98%. No problems were found with low strength of the electrode assembly structure or abnormal assembly of the battery cells. The tabs 1, 2, and 3, as well as the electrode assembly, were undamaged and undeformed. The capacity, assembly, and temperature of the battery cells all meet the requirements of the battery cells.
[0055] In Example 3, H is 35mm, L1 / A is 0.55, W1 / B is 0.3, M / F is 0.22, SM is 10mm, K / E1 is 0.28, E2-F is 90mm, N is 60°, and B is 55mm. The yield rate of the battery cells is >98%. No problems were found with low strength of the electrode assembly structure or abnormal assembly of the battery cells. The tabs 123 and electrode assemblies were undamaged and undeformed. The capacity, assembly, and temperature of the battery cells all meet the requirements of the battery cells.
[0056] In Example 4, H is 48mm, L1 / A is 0.62, W1 / B is 0.33, M / F is 0.26, SM is 12mm, K / E1 is 0.32, E2-F is 124mm, N is 70°, and B is 76mm. The yield rate of the battery cells is >98%. No problems were found with low strength of the electrode assembly structure or abnormal assembly of the battery cells. The tabs 1, 2, and 3, as well as the electrode assembly, were undamaged and undeformed. The capacity, assembly, and temperature of the battery cells all meet the requirements of the battery cells.
[0057] In Example 5, H is 62mm, L1 / A is 0.71, W1 / B is 0.36, M / F is 0.31, SM is 14mm, K / E1 is 0.36, E2-F is 162mm, N is 80°, and B is 93mm. The yield rate of the battery cells is >98%. No problems were found with low strength of the electrode assembly structure or abnormal assembly of the battery cells. The tabs 123 and electrode assembly were undamaged and undeformed. The capacity, assembly, and temperature of the battery cells all meet the requirements of the battery cells.
[0058] In Example 6, H is 70mm, L1 / A is 0.75, W1 / B is 0.4, M / F is 0.35, SM is 16mm, K / E1 is 0.4, E2-F is 200mm, N is 90°, and B is 120mm. The yield rate of the battery cells is >98%. No problems were found with low strength of the electrode assembly structure or abnormal assembly of the battery cells. The tabs 123 and electrode assembly were undamaged and undeformed. The capacity, assembly, and temperature of the battery cells all meet the requirements of the battery cells.
[0059] In Comparative Example 1, H is 35mm, L1 / A is 0.25, W1 / B is 0.3, M / F is 0.22, SM is 10mm, K / E1 is 0.28, E2-F is 90mm, N is 60°, and B is 55mm. As can be seen from Examples 1-6 and Comparative Example 1, when L1 / A is less than 0.26, the yield rate of the battery cell is less than 98%; the capacity improvement of the electrode group is small and cannot meet the high-rate fast charging requirements of the battery cell.
[0060] In Comparative Example 2, H is 35mm, L1 / A is 0.85, W1 / B is 0.3, M / F is 0.22, SM is 10mm, K / E1 is 0.28, E2-F is 90mm, N is 60°, and B is 55mm. As can be seen from Examples 1-6 and Comparative Example 2, when L1 / A is greater than 0.84, the yield of the battery cell is less than 98%; the external conductive structure 222 is deformed and damaged in the narrow area, the external conductive structure 222 has poor current carrying capacity, and the cover plate 221 is difficult to form, with low production yield and low production efficiency.
[0061] In Comparative Example 3, H is 35mm, L1 / A is 0.55, W1 / B is 0.3, M / F is 0.08, SM is 10mm, K / E1 is 0.28, E2-F is 90mm, N is 60°, and B is 55mm. As shown in Examples 1-6 and Comparative Example 3, when M / F is less than 0.09, the yield rate of the battery cell is <98%; the structural strength of the second electrode assembly body 12 is low. The welding of the two housing parts 2112 is difficult, has a low welding yield, and low welding efficiency.
[0062] In Comparative Example 4, H is 35mm, L1 / A is 0.55, W1 / B is 0.3, M / F is 0.4, SM is 10mm, K / E1 is 0.28, E2-F is 90mm, N is 60°, and B is 55mm. As can be seen from Examples 1-6 and Comparative Example 4, when M / F is greater than 0.39, the yield rate of the battery cell is less than 98%; the improvement in electrode volume and capacity is small, which cannot meet the high-rate fast charging requirements of the battery cell.
[0063] In Comparative Example 5, H is 35mm, L1 / A is 0.55, W1 / B is 0.3, M / F is 0.22, SM is 10mm, K / E1 is 0.28, E2-F is 40mm, N is 60°, and B is 55mm. As can be seen from Examples 1-6 and Comparative Example 5, when E2-F is less than 41mm, the yield rate of the battery cell is <98%; the improvement in electrode volume and capacity is small, which cannot meet the high-rate fast charging requirements of the battery cell.
[0064] In Comparative Example 6, H is 35mm, L1 / A is 0.55, W1 / B is 0.3, M / F is 0.22, SM is 10mm, K / E1 is 0.28, E2-F is 220mm, N is 60°, and B is 55mm. As can be seen from Examples 1-6 and Comparative Example 6, when E2-F is greater than 219mm, the yield of qualified battery cells is <98%; the second electrode assembly body 12 is easily damaged, scratched, and deformed, and the battery casing is difficult to form, with low production yield and low production efficiency.
[0065] 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, characterized in that, include: The electrode group has a thickness direction in the first direction (D1). The electrode group includes a first electrode group body (11) and four second electrode group bodies (12). The four second electrode group bodies (12) are paired up to form two inclined electrode group components (13). The two inclined electrode group components (13) are located on both sides of the first electrode group body (11) along the second direction (D2). The two second electrode group bodies (12) in the same inclined electrode group component (13) are connected to both sides of the first electrode group body (11) along the third direction (D3). One of the two inclined electrode group components (13) is inclined in a direction away from the other. The two second electrode group bodies (12) of the inclined electrode group component (13) are inclined in a direction away from each other. The first direction (D1), the second direction (D2) and the third direction (D3) are perpendicular to each other. A housing structure that conforms to the shape of the electrode assembly, wherein the electrode assembly is disposed within the housing structure.
2. The battery cell according to claim 1, characterized in that, The first pole group body (11) is provided with four first connecting parts (111), and each second pole group body (12) is provided with a second connecting part (121). The second connecting parts (121) of the four second pole group bodies (12) correspond one-to-one with the four first connecting parts (111). The second connecting part (121) of each second pole group body (12) is respectively inserted and engaged with one of the corresponding first connecting parts (111).
3. The battery cell according to claim 2, characterized in that, The housing structure includes a battery housing, which comprises a first housing (211) and four second housings (212). The first housing (211) has a first opening (2111) on at least one side along the second direction (D2). The four second housings (212) are grouped in pairs to form two inclined housing groups (213). The two inclined housing groups (213) are respectively located on both sides of the first housing (211) along the second direction (D2). Two second housings (212) in the same inclined housing group (213) are respectively connected to the first housing (211). Along both sides of the third direction (D3), each of the second housings (212) has a second opening (2121) on the side away from the first housing (211). The first pole group body (11) can enter the first housing (211) through the first opening (2111). The four second pole group bodies (12) correspond one-to-one with the four second housings (212). Each second pole group body (12) can enter the corresponding second housing (212) through the second opening (2121) of the corresponding second housing (212).
4. The battery cell according to claim 3, characterized in that, A sealing plate (214) is provided at the first opening (2111). The housing structure also includes four cover plate assemblies (22). The four cover plate assemblies (22) correspond one-to-one with the four second housings (212). Each cover plate assembly (22) is respectively installed at the second opening (2121) of a corresponding second housing (212).
5. The battery cell according to claim 4, characterized in that, The second electrode assembly body (12) has a capacity-enhancing part (122) protruding on the side away from the first electrode assembly body (11). Each cover plate assembly (22) has a limiting groove on the side facing the corresponding second electrode assembly body (12). The capacity-enhancing part (122) on each second electrode assembly body (12) is insulated and embedded in the corresponding limiting groove.
6. The battery cell according to claim 5, characterized in that, The second electrode body (12) is provided with an electrode tab (123) on the side opposite to the first electrode body (11). On the same second electrode body (12), the capacity expansion part (122) is provided with the electrode tab (123) on both sides along the first direction (D1).
7. The battery cell according to claim 5, characterized in that, Along the third direction (D3), the side of one of the two second pole group bodies (12) located on the same side as the first pole group body (11) facing the other is the first side (1241) of the second pole group body (12). Along the third direction (D3), the side of one of the two second pole group bodies (12) located on the same side as the first pole group body (11) away from the other is the second side (1242) of the second pole group body (12). In the same second pole group body (12), the dimension of the expansion part (122) along the direction from the first side (1241) to the second side (1242) is L1, and the dimension of the second pole group body (12) along the direction from the first side (1241) to the second side (1242) is A, 0.26≤L1 / A≤0.
84.
8. The battery cell according to any one of claims 2-7, characterized in that, The first pole body (11) has a dimension of F along the second direction (D2), and the distance between the two first connecting parts (111) on the same side of the first pole body (11) along the third direction (D3) and facing each other is M in the second direction (D2), where 0.09≤M / F≤0.
39.
9. The battery cell according to any one of claims 1-7, characterized in that, The dimension of the electrode group along the second direction (D2) is E2, and the dimension of the first electrode group body (11) along the second direction (D2) is F, 41mm≤E2-F≤219mm.
10. The battery cell according to any one of claims 1-7, characterized in that, The first electrode assembly body (11) is provided with four conductive layer structures (112), and the four conductive layer structures (112) correspond one-to-one with the four second electrode assembly bodies (12). Each conductive layer structure (112) includes a first conductive layer (1121) and a second conductive layer (1122). The first conductive layer (1121) and the second conductive layer (1122) are spaced apart and have opposite polarities. Both the first conductive layer (1121) and the second conductive layer (1122) are conductively connected to the first electrode assembly body (11). The second electrode assembly body (12) is provided with a third conductive layer (1251) and a second conductive layer (1252) on the side facing the first electrode assembly body (11). The fourth conductive layer (1252) is provided with a third conductive layer (1251) and a fourth conductive layer (1252) spaced apart and having opposite polarities. Both the third conductive layer (1251) and the fourth conductive layer (1252) are electrically connected to the second electrode group body (12). The third conductive layer (1251) of each second electrode group body (12) is attached to the first conductive layer (1121) of a corresponding conductive layer structure (112), and the fourth conductive layer (1252) of each second electrode group body (12) is attached to the second conductive layer (1122) of a corresponding conductive layer structure (112).