Battery cell assembly and battery comprising same
By introducing a blocking section and a lead-out section into the cell assembly, the short-circuit problem caused by insufficient welding strength of the hard tabs is solved, ensuring battery safety and structural stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-04-07
AI Technical Summary
In conventional batteries, rigid tabs may break due to insufficient welding strength under impact from external objects, leading to internal short circuits and safety issues.
Design a battery cell assembly that uses a stacked core with a first tab connected to a second tab lead-out section. The lead-out section has a blocking part at the end near the stacked core, and the extension direction of the blocking part is parallel to the thickness direction of the stacked core, which is used to prevent the tab from being inserted into the stacked core and to prevent short circuit.
The design of the blocking part prevents the tabs from inserting into the stacked core, thus preventing short circuits, ensuring battery safety, and extending battery life.
Smart Images
Figure CN224096919U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of batteries, and specifically proposes a cell assembly and a battery including the same. Background Technology
[0002] In conventional batteries, especially stacked batteries, most use a straight-out tab structure, meaning the welded joint between the hard and soft tabs is perpendicular to the thickness of the stacked core. When the battery is impacted by an external object, the hard tab may move relative to the electrode due to insufficient welding strength, causing the connection between the hard and soft tabs to break. In some cases, the hard tab may even insert into the stacked core and come into contact with the electrodes of different electrodes, creating an internal short circuit and potentially leading to safety issues such as battery fire. Utility Model Content
[0003] The purpose of this application is to solve at least some of the technical problems mentioned above, and this purpose is achieved through the following technical solutions:
[0004] In a first aspect, this application proposes a battery cell assembly comprising a stacked core and a second tab. The stacked core has a first tab that is closed inward. The second tab includes a lead-out section and a blocking section. The lead-out section is connected to the first tab, and the blocking section extends in a direction that has at least a component parallel to the thickness direction of the stacked core. The blocking section is disposed at one end of the lead-out section near the stacked core.
[0005] In some embodiments, the portion where the lead-out section and the first electrode tab are connected forms a connecting portion, and the connecting portion and the blocking portion are spaced apart.
[0006] In some embodiments, the thickness of the stacked core is H mm, the second electrode tab has a length of L mm in the second direction, the blocking portion has a length of L1 mm in the first direction, and satisfies 0.45 ≤ L1 / H ≤ 0.9, and / or 0.2 ≤ L1 / (L+L1) ≤ 0.7; wherein, the first direction is the thickness direction of the stacked core, and the second direction is perpendicular to the first direction.
[0007] In some embodiments, the lead-out section and the blocking section are arranged at an angle θ, and the angle satisfies 45°≤θ≤90°.
[0008] In some embodiments, the core stack includes a first electrode sheet, a diaphragm, and a second electrode sheet stacked sequentially; the first edge of the first electrode sheet is provided with a first empty foil area and a first notch area, and the second edge of the second electrode sheet is provided with a second empty foil area and a second notch area, the first edge and the second edge are arranged opposite to each other, the first empty foil area and the second notch area are arranged correspondingly, and the first notch area and the second empty foil area are arranged correspondingly; the first empty foil areas of multiple first electrode sheets are gathered together to form a set of first electrode tabs, and the second empty foil areas of multiple second electrode sheets are gathered together to form another set of first electrode tabs; there are two second electrode tabs, and the two second electrode tabs are respectively connected to the two sets of first electrode tabs.
[0009] In some embodiments, the stacked core has a third direction, which is perpendicular to the first direction and the second direction; the first electrode has a third edge and a fourth edge disposed opposite to each other along the third direction, and the first empty foil region has a fifth edge and a sixth edge disposed opposite to each other along the third direction, the fifth edge of the first empty foil region being close to the third edge of the first electrode, and there is a gap between the fifth edge and the third edge; the first empty foil region is disconnected from the first electrode at both the fifth edge and the sixth edge. The second electrode has a seventh edge and an eighth edge disposed opposite to each other along the third direction, and the second empty foil region has a ninth edge and a tenth edge disposed opposite to each other along the third direction, the ninth edge of the second empty foil region being close to the seventh edge of the second electrode, and there is a gap between the ninth edge and the seventh edge; the second empty foil region is disconnected from the second electrode at both the ninth edge and the tenth edge.
[0010] In some embodiments, the stacked core has a third direction, which is perpendicular to the first direction and the second direction; the first electrode has a third edge and a fourth edge disposed opposite to each other along the third direction, and the first empty foil region has a fifth edge and a sixth edge disposed opposite to each other along the third direction, the fifth edge of the first empty foil region coincides with the third edge of the first electrode, and the first empty foil region is disconnected from the first electrode at the sixth edge. The second electrode has a seventh edge and an eighth edge disposed opposite to each other along the third direction, and the second empty foil region has a ninth edge and a tenth edge disposed opposite to each other along the third direction, the ninth edge of the second empty foil region coincides with the seventh edge of the second electrode, and the second empty foil region is disconnected from the second electrode at the tenth edge.
[0011] In some embodiments, the stacked core has a third direction, which is perpendicular to the first direction and the second direction; the first electrode has a first edge and an eleventh edge disposed opposite to each other along the second direction, and a third edge and a fourth edge disposed opposite to each other along the third direction; a first empty foil area and a first notch area are respectively disposed at both ends of the first edge, and the first empty foil area has a first inclined edge, which is disposed at an angle to the first edge and the third edge, respectively. The second electrode has a second edge and a twelfth edge disposed opposite to each other along the second direction, and a seventh edge and an eighth edge disposed opposite to each other along the third direction; a second empty foil area and a second notch area are respectively disposed at both ends of the second edge, and the second empty foil area has a second inclined edge, which is disposed at an angle to the second edge and the seventh edge, respectively.
[0012] In some embodiments, the battery cell assembly has a first surface and a second surface disposed opposite to each other along the thickness direction Z, and a blocking portion extends toward the first surface; a portion of the first empty foil area converges toward the direction away from the first surface, and another portion of the first empty foil area converges toward the direction closer to the first surface, and the two portions of the first empty foil area approach and converge with each other; and / or, a portion of the second empty foil area converges toward the direction away from the first surface, and another portion of the second empty foil area converges toward the direction closer to the first surface, and the two portions of the second empty foil area approach and converge with each other. Alternatively, all the first empty foil areas converge toward the direction away from the first surface; and / or all the second empty foil areas converge toward the direction away from the first surface.
[0013] Secondly, this application proposes a battery that includes the cell assembly of the first aspect.
[0014] The technical solution proposed in this application has at least the following technical effects:
[0015] In this application, the stacked core has a first tab that is folded together, and a second tab includes a lead-out section connected to the first tab. A blocking portion is provided at the end of the lead-out section near the stacked core, and the extending direction of the blocking portion has at least a component parallel to the thickness direction of the stacked core. The end of the lead-out section away from the stacked core protrudes from the casing. When the lead-out section of the second tab is impacted by an external force, the second tab will move closer to the stacked core, causing the blocking portion to contact the folded first tab, and a compressive force is generated between them. This prevents the second tab from continuing to move towards the stacked core, avoiding insertion of the second tab into the stacked core, preventing internal short circuits, and ensuring battery safety. Furthermore, the blocking effect of the blocking portion also prevents excessive relative movement between the first and second tabs, thereby preventing breakage at the connection point between the first and second tabs, ensuring battery structural stability, and extending battery life. Attached Figure Description
[0016] To better integrate the content illustrated in the accompanying drawings with the description of the specific embodiments, a brief introduction to the drawings is provided below. It is understood that the accompanying drawings mentioned below are merely schematic illustrations of some embodiments of the relevant technical solutions and the technical solutions of this application. Without creative effort, those skilled in the art can create drawings illustrating other embodiments.
[0017] Specifically, the annotations for the accompanying drawings are as follows:
[0018] Figure 1 This is a top view of a battery cell assembly as described in some embodiments of this application;
[0019] Figure 2 for Figure 1 A schematic diagram of a cross-sectional structure along point AA;
[0020] Figure 3 for Figure 1 Another cross-sectional view of the structure along point AA;
[0021] Figure 4 These are schematic diagrams illustrating the structures of two types of second electrodes described in some embodiments of this application;
[0022] Figure 5 This is a schematic diagram of a first structure of the first electrode, diaphragm, and second electrode as described in some embodiments of this application;
[0023] Figure 6 This is a schematic diagram of a second structure of the first electrode, diaphragm, and second electrode described in some embodiments of this application;
[0024] Figure 7 This is a schematic diagram of a third structure of the first electrode, diaphragm, and second electrode as described in some embodiments of this application;
[0025] Figure 8 This is a schematic diagram of the bending of a second electrode lug as described in some embodiments of this application;
[0026] Figure 9 This is a schematic diagram of the bending of another second electrode tab as described in some embodiments of this application;
[0027] Figure 10 This is a top view of another battery cell assembly described in some embodiments of this application;
[0028] Figure 11 This is a schematic diagram of the structure of the first empty foil region as described in some embodiments of this application;
[0029] Figure 12 This is a schematic diagram of the structure of the second empty foil region as described in some embodiments of this application.
[0030] Specifically, the annotations for the figure marks in the instruction manual are as follows:
[0031] 10. Core stack; 100. First electrode tab; 101. First surface; 102. Second surface; 110. First electrode plate; 111. First empty foil area; 1111. Fifth edge; 1112. Sixth edge; 1113. First inclined edge; 112. First notch area; 113. First edge; 114. Third edge; 115. Fourth edge; 116. Eleventh edge; 120. Second electrode plate; 121. Second empty foil area; 1211. Ninth edge; 1212, Tenth edge; 1213, Second inclined edge; 122, Second notch area; 123, Second edge; 124, Seventh edge; 125, Eighth edge; 126, Twelfth edge; 130, Diaphragm; 131, Clearance opening; 20, Second tab; 210, Lead-out section; 220, Blocking part; 230, Connecting part; 240, Sealant; 250, Fold line; 30, Housing; Z, First direction; Y, Second direction; X, Third direction. Detailed Implementation
[0032] To make the embodiments of this application clearer, they will be described below in conjunction with the accompanying drawings. It is to be understood that the content mentioned below is only a partial embodiment of this application, while the complete list of all embodiments is provided. Therefore, other embodiments obtained based on the following embodiments without any inventive effort all fall within the protection scope of this application.
[0033] It should be understood that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to impose strict limitations on the technical solutions unless the context clearly indicates otherwise. For example, the use of "a," "an," and "the" to modify a feature does not preclude the possibility that the feature may be plural in other embodiments.
[0034] It should be understood that the terms "comprising," "including," and "having" are open-ended, indicating the presence of the stated features but not excluding the possibility of other features in the embodiment. Similarly, the use of terms such as "first," "second," etc., to describe multiple features only indicates the distinction between one feature and another, and such terms do not imply order or sequence unless explicitly stated in the context.
[0035] It should be understood that, unless the context clearly indicates otherwise, the terms "setup," "connection," and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a direct connection or an indirect connection via a medium. Those skilled in the art will understand the specific meaning of these terms in this document based on the specific circumstances.
[0036] In addition, for ease of description, the text will use terms of spatial relative relationship to describe the position of one feature relative to another feature, such as "inner", "outer", "end", "side", "upper", "middle", "lower", "high", "low", "axial", "circumferential", "radial", "horizontal", "vertical", "first direction", "second direction", etc. It can be understood that the spatial relative relationship between two features should include other specific situations besides those shown in the accompanying drawings of the specification.
[0037] The embodiments of this application will now be described with reference to the accompanying drawings.
[0038] Firstly, referring to Figures 1 to 3 This application provides an embodiment of a battery cell assembly, which includes a stacked core 10 and a second tab 20. The stacked core 10 has a first tab 100 that is folded back. The second tab 20 includes a lead-out section 210 and a blocking portion 220. The lead-out section 210 is connected to the first tab 100, and the blocking portion 220 extends in a direction that has at least a component parallel to the thickness direction of the stacked core 10. The blocking portion 220 is disposed at one end of the lead-out section 210 near the stacked core 10.
[0039] The stacked core 10 proposed in this application embodiment has a first direction Z, a second direction Y and a third direction X that are mutually perpendicular to each other, wherein the thickness direction of the stacked core 10 can be taken as the first direction Z.
[0040] In this embodiment, the stacked core 10 has a first tab 100 that is folded together, and a second tab 20 includes a lead-out section 210 connected to the first tab 100. A blocking portion 220 is provided at the end of the lead-out section 210 near the stacked core 10, and the end of the lead-out section 210 away from the stacked core 10 extends out of the housing 30. When the lead-out section 210 of the second tab 20 is impacted by an external force, the second tab 20 will move closer to the stacked core 10, causing the blocking portion 220 to contact the folded first tab 100, and a squeezing force to be generated between them. This prevents the second tab 20 from continuing to move towards the stacked core 10, avoids the second tab 20 from inserting into the stacked core 10, prevents internal short circuits in the battery, and ensures battery safety. Furthermore, the blocking function of the blocking part 220 can also prevent excessive relative movement between the first electrode 100 and the second electrode 20, thereby avoiding breakage at the connection part 230 between the first electrode 100 and the second electrode 20, ensuring battery structural stability, and extending battery life. In addition, when the blocking part 220 approaches and squeezes the first electrode 100 after it has been closed due to external force, it may cause partial deformation of the first electrode 100 and push back against the blocking part 220, thus buffering the external force.
[0041] It should be understood that the part where the lead-out section 210 is connected to the first tab 100 is perpendicular to the thickness direction of the stacked core 10, thus forming a straight tab structure. In this structure, a blocking part 220 is provided at the end of the lead-out section 210 near the stacked core 10.
[0042] Specifically, "the extension direction of the blocking part 220 has at least a component parallel to the thickness direction of the core 10" can be understood as the extension direction of the blocking part 220 having a projection of a certain size along the thickness direction of the core 10, which includes two cases: "the extension direction of the blocking part 220 is parallel to the thickness direction of the core 10" and "the extension direction of the blocking part 220 is inclined relative to the thickness direction of the core 10".
[0043] Optionally, refer to Figure 8 The blocking part 220 is a sheet-like structure that bends along the fold line 250 with the lead-out section 210, or, refer to Figure 4 The blocking part 220 may also be, but is not limited to, a block, sphere, hemisphere or other structure connected to the end of the lead-out section 210.
[0044] In some embodiments, refer to Figure 1 and Figure 2 The portion where the lead-out section 210 connects to the first electrode tab 100 forms a connecting portion 230, and the connecting portion 230 is spaced apart from the blocking portion 220.
[0045] In this embodiment, the connecting portion 230 of the lead-out section 210 is welded to the first electrode tab 100. The connecting portion 230 and the blocking portion 220 are spaced apart to avoid the connecting portion 230 being too hot during welding, which would melt and damage the blocking portion 220 and cause the blocking effect to fail.
[0046] In some embodiments, refer to Figure 3 The thickness of the stacked core 10 is H mm, the second electrode 20 has a length of L mm in the second direction Y, and the blocking part 220 has a length of L1 mm in the first direction Z, and satisfies 0.45≤L1 / H≤0.9 and / or 0.2≤L1 / (L+L1)≤0.7; wherein, the first direction Z is the thickness direction of the stacked core 10, and the second direction Y is perpendicular to the first direction Z.
[0047] In this embodiment, the length of the blocking portion 220 in the first direction Z relative to the thickness of the stacked core 10 cannot be too large; otherwise, the blocking portion 220 may easily interfere with the battery casing 30, thereby damaging the casing 30. Simultaneously, the length of the blocking portion 220 in the first direction Z relative to the thickness of the stacked core 10 cannot be too small; otherwise, it will be difficult to effectively hinder the movement of the second tab 20. Therefore, the length of the blocking portion 220 in the first direction Z relative to the thickness of the stacked core 10 should be moderate, i.e., L1 / H should be moderate. For example, L1 / H can be any value or a range between any two of the following: 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9.
[0048] Alternatively, the blocking portion 220 has a length L1 mm in the first direction Z, and the lead-out section 210 has a length L mm in the second direction Y, and satisfies 0.2 ≤ L1 / (L+L1) ≤ 0.7, thereby ensuring that the size of the blocking portion 220 relative to the second electrode 20 is appropriate.
[0049] Optionally, refer to Figure 3 In some embodiments, the dimension of the connecting portion 230 along the second direction Y is L2mm, and satisfies 0.5≤L2 / L1≤1.5, and / or 0.1≤L2 / (L+L1)≤0.5.
[0050] Specifically, the size of the connecting part 230 cannot be too small; otherwise, the connection strength between the second tab 20 and the first tab 100 will be insufficient, making it easy to break, and the current carrying capacity will be poor. At the same time, the size of the connecting part 230 cannot be too large; otherwise, it will occupy too much space in the second direction Y, reducing the volumetric energy density of the battery. Therefore, the size of the connecting part 230 should be moderate, that is, L2 / L1 and L2 / (L+L1) should be moderate. For example, L2 / L1 can take any value of 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5 or a range between any two of these values, and / or L2 / (L+L1) can take any value of 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5 or a range between any two of these values.
[0051] Optionally, refer to Figure 3 In some embodiments, the distance between the connecting part 230 and the blocking part 220 is L3mm, and satisfies 0mm<L3≤0.8mm.
[0052] In this embodiment, L3 cannot be too large, otherwise it will occupy too much space of the battery along the second direction Y, reducing the volumetric energy density; at the same time, L3 cannot be too small, otherwise the heat at the connection part 230 will be too high during welding, easily melting and damaging the blocking part 220. Therefore, L3 should be moderate, for example, L3 can be any value of 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm or a range between any two of these values.
[0053] In some embodiments, refer to Figure 2 The lead-out section 210 and the blocking section 220 are set at an angle of θ, and the angle satisfies 45°≤θ≤90°.
[0054] In this embodiment, the angle between the lead-out section 210 and the blocking part 220 cannot be too large. For example, if the blocking part 220 is tilted towards the core 10, the angle between the lead-out section 210 and the blocking part 220 will be greater than 90°, causing the second electrode tab 20 to occupy too much space in the second direction Y. Simultaneously, the angle between the lead-out section 210 and the blocking part 220 cannot be too small. For example, if the blocking part 220 is tilted away from the core 10, the angle between the lead-out section 210 and the blocking part 220 will be less than 45°, which will affect the blocking effect of the blocking part 220 and increase the possibility of the lead-out section 210 being inserted into the core 10. Therefore, the angle between the lead-out section 210 and the blocking part 220 should be moderate, that is, θ should be moderate. For example, θ can be any value of 45°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, or 90°, or a range between any two of these values.
[0055] In some embodiments, refer to Figures 5 to 7 The core 10 includes a first electrode 110, a diaphragm 130, and a second electrode 120 stacked sequentially. The first edge 113 of the first electrode 110 is provided with a first empty foil area 111 and a first notch area 112 spaced apart. The second edge 123 of the second electrode 120 is provided with a second empty foil area 121 and a second notch area 122 spaced apart. The first edge 113 and the second edge 123 are arranged opposite to each other. The first empty foil area 111 and the second notch area 122 are arranged correspondingly, and the first notch area 112 and the second empty foil area 121 are arranged correspondingly. The first empty foil areas 111 of multiple first electrode 110 are gathered together to form a set of first electrode tabs 100. The second empty foil areas 121 of multiple second electrode 120 are gathered together to form another set of first electrode tabs 100. There are two second electrode tabs 20, and the two second electrode tabs 20 are respectively connected to the two sets of first electrode tabs 100.
[0056] In this embodiment, it is understood that the electrode is coated with an active material, and the active material is removed from a portion of the electrode to form an empty foil area; a notch area is formed by cutting off a portion of the electrode. In this embodiment, the area of the active material coating is increased, thereby improving the energy density of the battery.
[0057] In addition, the empty foil area on the first electrode 110 is set to correspond to the notch area on the second electrode 120, and the empty foil area on the second electrode 120 is set to correspond to the notch area on the first electrode 110. The notch area avoids the empty foil area, making it easier to gather the empty foil area.
[0058] It should be noted that the first electrode 110, the separator 130, and the second electrode 120 are stacked to form a core 10, with the separator 130 positioned between adjacent first electrode 110 and second electrode 120. The separator 130 has two clearance openings 131, corresponding to the first empty foil area 111 and the second empty foil area 121 respectively, thereby avoiding any restriction on the closing of the empty foil areas. Optionally, if the first electrode 110 is a positive electrode and the second electrode 120 is a negative electrode, then when viewed along the first direction Z, the second electrode 120 completely covers the first electrode 110 (ensuring that all lithium ions extracted from the positive electrode can react with the negative electrode, ensuring battery efficiency), and the separator 130 completely covers the second electrode 120 (preventing contact between the first electrode 110 and the second electrode 120, avoiding internal short circuits). (Refer to...) Figure 11 and Figure 12 The same rules apply to the empty foil area and the notch area. Furthermore, the portion of the diaphragm 130 extending beyond the notch area can provide support to the root of the empty foil area, thereby enhancing its strength.
[0059] In some embodiments, refer to Figure 5The stacked core 10 has a third direction X, which is perpendicular to the first direction Z and the second direction Y. The first electrode 110 has a third edge 114 and a fourth edge 115 arranged opposite to each other along the third direction X. The first empty foil region 111 has a fifth edge 1111 and a sixth edge 1112 arranged opposite to each other along the third direction X. The fifth edge 1111 of the first empty foil region 111 is close to the third edge 114 of the first electrode 110, and there is a gap between the fifth edge 1111 and the third edge 114. The first empty foil region 111 is disconnected from the first electrode 110 at the positions of the fifth edge 1111 and the sixth edge 1112. The second electrode 120 has a seventh edge 124 and an eighth edge 125 disposed opposite to each other along a third direction X. The second empty foil region 121 has a ninth edge 1211 and a tenth edge 1212 disposed opposite to each other along a third direction X. The ninth edge 1211 of the second empty foil region 121 is close to the seventh edge 124 of the second electrode 120, and there is a gap between the ninth edge 1211 and the seventh edge 124. The second empty foil region 121 is disconnected from the second electrode 120 at both the positions of the ninth edge 1211 and the tenth edge 1212.
[0060] This embodiment describes a first arrangement of the empty foil area and the notched area on the electrode sheet. Specifically, the two opposite edges of the empty foil area along the third direction X are spaced apart from the two opposite edges of the electrode sheet along the third direction X, and the two opposite edges of the empty foil area along the third direction X are disconnected from the electrode sheet, facilitating the closing arrangement of the empty foil area. Optionally, the empty foil area in this embodiment is rectangular.
[0061] In some embodiments, refer to Figure 6 The stacked core 10 has a third direction X, which is perpendicular to the first direction Z and the second direction Y. The first electrode 110 has a third edge 114 and a fourth edge 115 arranged opposite each other along the third direction X. The first empty foil area 111 has a fifth edge 1111 and a sixth edge 1112 arranged opposite each other along the third direction X. The fifth edge 1111 of the first empty foil area 111 coincides with the third edge 114 of the first electrode 110. The first empty foil area 111 is disconnected from the first electrode 110 at the position of the sixth edge 1112. The second electrode 120 has a seventh edge 124 and an eighth edge 125 arranged opposite each other along the third direction X. The second empty foil area 121 has a ninth edge 1211 and a tenth edge 1212 arranged opposite each other along the third direction X. The ninth edge 1211 of the second empty foil area 121 coincides with the seventh edge 124 of the second electrode 120. The second empty foil area 121 is disconnected from the second electrode 120 at the position of the tenth edge 1212.
[0062] This embodiment illustrates a second arrangement of the empty foil area and the notch area on the electrode sheet. Specifically, the empty foil area is located at the corner of the electrode sheet, and in this embodiment, the empty foil area can be rectangular. The empty foil area has two opposite edges along a third direction X, one edge of which coincides with the edge of the electrode sheet, and the other edge which is disconnected from the electrode sheet, thereby facilitating the retraction of the empty foil area.
[0063] In some embodiments, refer to Figure 7 The stacked core 10 has a third direction X, which is perpendicular to the first direction Z and the second direction Y. The first electrode 110 has a first edge 113 and an eleventh edge 116 arranged opposite to each other along the second direction Y. The first electrode 110 also has a third edge 114 and a fourth edge 115 arranged opposite to each other along the third direction X. The first empty foil area 111 and the first notch area 112 are respectively located at both ends of the first edge 113. The first empty foil area 111 has a first inclined edge 1113, which is arranged at an angle to the first edge 113 and the third edge 114. The second electrode 120 has a second edge 123 and a twelfth edge 126 arranged opposite each other along the second direction Y. The second electrode 120 also has a seventh edge 124 and an eighth edge 125 arranged opposite each other along the third direction X. The second empty foil area 121 and the second notch area 122 are respectively located at both ends of the second edge 123. The second empty foil area 121 has a second inclined edge 1213, which is arranged at an angle to the second edge 123 and the seventh edge 124.
[0064] This embodiment illustrates a third arrangement of the empty foil area and the notch area on the electrode sheet. Understandably, the empty foil area is located at the corner of the electrode sheet and has an inclined edge. The empty foil area is brought together relative to the electrode sheet along the inclined edge, facilitating operation. Optionally, the empty foil area can be triangular, or the corners of the empty foil area can be rounded or chamfered; all of these are within the scope of this embodiment.
[0065] Optionally, refer to Figure 9 and Figure 10 The blocking part 220 is a sheet-like structure that is bent and arranged with the lead-out section 210. There is a fold line 250 between the blocking part 220 and the lead-out section 210. The fold line 250 is parallel to the inclined edge. The distance between the fold line 250 and the inclined edge is D1, and satisfies 0.2mm≤D1≤1mm.
[0066] In some embodiments, refer to Figure 2The battery cell assembly has a first surface 101 and a second surface 102 disposed opposite to each other along the thickness direction Z. The blocking portion 220 extends toward the first surface 101. A portion of the first empty foil area 111 converges toward the direction away from the first surface 101, and another portion of the first empty foil area 111 converges toward the direction closer to the first surface 101, and the two portions of the first empty foil area 111 approach and converge with each other. And / or, a portion of the second empty foil area 121 converges toward the direction away from the first surface 101, and another portion of the second empty foil area 121 converges toward the direction closer to the first surface 101, and the two portions of the second empty foil area 121 approach and converge with each other.
[0067] In this embodiment, the empty foil area is divided into two parts and gathered in opposite directions. The space occupied by the gathered empty foil area relative to the initially bent portion of the electrode sheet in the second direction Y is relatively small. For example, in this embodiment, the dimension of the gathered empty foil area relative to the initially bent portion of the electrode sheet in the second direction Y is d1mm; when all the empty foil areas are gathered in a direction away from the first surface 101, the dimension of the gathered empty foil area relative to the initially bent portion of the electrode sheet in the second direction Y is d2mm. It should be understood that d1 is less than d2.
[0068] In some embodiments, refer to Figure 3 All of the first empty foil areas 111 converge in a direction away from the first surface 101; and / or all of the second empty foil areas 121 converge in a direction away from the first surface 101.
[0069] In this embodiment, all empty foil areas converge in a direction away from the first surface 101, so that the connection position between the second electrode 20 and the empty foil area is far from the first surface 101, thereby reserving more space for the extension of the blocking part 220 in the first direction Z. That is, the extension dimension of the blocking part 220 in the first direction Z can be set to be larger, thereby enhancing the blocking effect.
[0070] Optionally, in some embodiments, the end of the blocking portion 220 near the first surface 101 is provided with a rounded corner, the radius of which is controlled between 0.2 mm and 1 mm; and / or, the length of the burr on the end of the blocking portion 220 near the first surface 101 is controlled to not exceed 0.3 mm.
[0071] In this embodiment, the end of the blocking part 220 near the first surface 101 is chamfered and the burr size is controlled to ensure that the end of the blocking part 220 near the first surface 101 is relatively smooth. This prevents the blocking part 220 from moving along the first direction Z during battery use and squeezing the housing 30, causing damage to the housing 30, resulting in water vapor entering the battery and reacting with the electrolyte, or causing electrolyte leakage, fire and other safety problems.
[0072] Optionally, refer to Figure 3The distance between the end of the blocking part 220 near the first surface 101 and the housing 30 is D, and satisfies 0.3mm≤D≤1mm.
[0073] Secondly, embodiments of this application propose a battery that includes the cell assembly of the first aspect. Therefore, the battery of the second aspect possesses at least all the technical effects of the cell assembly of the first aspect, the specific technical effects of which will not be elaborated here.
[0074] It should be understood that the embodiments of this application only illustrate the structure of the battery in relation to the improvement points of this application in the second aspect, but it does not mean that it does not have other structures. For example, the battery also includes a housing 30, a sealant 240 disposed on the second tab 20 (when the second tab 20 is led out from the housing 30, the second tab 20 is connected to the inner wall of the housing 30 by the sealant 240), etc. Other structures will not be described in detail here.
[0075] In particular, the term "and / or" in this application should be understood as follows:
[0076] In the first case, the term “and / or” between the first subject and the second subject includes any of the following meanings: (1) only the first subject; (2) only the second subject; and (3) both the first subject and the second subject.
[0077] In the second case, the term "and / or" between the last two of three or more subjects means including at least any one of the subjects. For example, "first subject, second subject and / or third subject" has the same meaning as "first subject and / or second subject and / or third subject", specifically including the following combinations: (1) only the first subject; (2) only the second subject; (3) only the third subject; (4) first subject and second subject and no third subject; (5) first subject and third subject and no second subject; (6) second subject and third subject and no first subject; and (7) first subject, second subject and third subject;
[0078] Furthermore, the character " / " in this application indicates that the objects before and after it are in an "or" relationship.
[0079] Finally, although the embodiments of this application have been described above in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the concept of this application, and such modifications and variations all fall within the scope of protection of this application.
Claims
1. A battery cell assembly, characterized in that, include: Stacked core (10), having a first pole piece (100) with a collapsible setting; The second tab (20) includes a lead-out section (210) and a blocking section (220). The lead-out section (210) is connected to the first tab (100). The extending direction of the blocking section (220) has at least a component parallel to the thickness direction of the stacked core (10). The blocking section (220) is disposed at one end of the lead-out section (210) near the stacked core (10).
2. The battery cell assembly according to claim 1, characterized in that, The portion where the lead-out section (210) and the first electrode (100) are connected forms a connecting portion (230), and the connecting portion (230) is spaced apart from the blocking portion (220).
3. The battery cell assembly according to claim 1, characterized in that, The thickness of the stacked core (10) is H mm, the second electrode tab (20) has a length of L mm in the second direction (Y), and the blocking part (220) has a length of L1 mm in the first direction (Z), and satisfies 0.45≤L1 / H≤0.9, and / or 0.2≤L1 / (L+L1)≤0.7; wherein, the first direction (Z) is the thickness direction of the stacked core (10), and the second direction (Y) is perpendicular to the first direction (Z).
4. The cell assembly according to claim 1, characterized in that, The lead-out section (210) and the blocking part (220) are arranged at an angle θ, and the angle satisfies 45°≤θ≤90°.
5. The cell assembly according to any one of claims 1 to 4, characterized in that, The stacked core (10) includes a first electrode (110), a diaphragm (130), and a second electrode (120) stacked sequentially. The first edge (113) of the first electrode (110) is provided with a first empty foil area (111) and a first notch area (112) spaced apart, and the second edge (123) of the second electrode (120) is provided with a second empty foil area (121) and a second notch area (122) spaced apart. The first edge (113) and the second edge (123) are arranged opposite to each other. The first empty foil area (111) is arranged correspondingly to the second notch area (122), and the first notch area (112) is arranged correspondingly to the second empty foil area (121). The first empty foil areas (111) of a plurality of first electrode plates (110) are gathered together to form a group of first electrode tabs (100), and the second empty foil areas (121) of a plurality of second electrode plates (120) are gathered together to form another group of first electrode tabs (100); There are two second pole ears (20), and the two second pole ears (20) are respectively connected to two sets of first pole ears (100).
6. The cell assembly according to claim 5, characterized in that, The stacked core (10) has a third direction (X), which is perpendicular to the first direction (Z) and the second direction (Y); The first electrode (110) has a third edge (114) and a fourth edge (115) disposed opposite to each other along the third direction (X), and the first empty foil area (111) has a fifth edge (1111) and a sixth edge (1112) disposed opposite to each other along the third direction (X). The fifth edge (1111) of the first empty foil area (111) is close to the third edge (114) of the first electrode (110), and there is a gap between the fifth edge (1111) and the third edge (114). The first empty foil area (111) is disconnected from the first electrode (110) at the positions of the fifth edge (1111) and the sixth edge (1112). The second electrode (120) has a seventh edge (124) and an eighth edge (125) disposed opposite to each other along the third direction (X), and the second empty foil area (121) has a ninth edge (1211) and a tenth edge (1212) disposed opposite to each other along the third direction (X). The ninth edge (1211) of the second empty foil area (121) is close to the seventh edge (124) of the second electrode (120), and there is a gap between the ninth edge (1211) and the seventh edge (124). The second empty foil area (121) is disconnected from the second electrode (120) at the positions of the ninth edge (1211) and the tenth edge (1212).
7. The cell assembly according to claim 5, characterized in that, The stacked core (10) has a third direction (X), which is perpendicular to the first direction (Z) and the second direction (Y); The first electrode (110) has a third edge (114) and a fourth edge (115) disposed opposite to each other along the third direction (X), and the first empty foil area (111) has a fifth edge (1111) and a sixth edge (1112) disposed opposite to each other along the third direction (X). The fifth edge (1111) of the first empty foil area (111) coincides with the third edge (114) of the first electrode (110), and the first empty foil area (111) is disconnected from the first electrode (110) at the position of the sixth edge (1112). The second electrode (120) has a seventh edge (124) and an eighth edge (125) disposed opposite to each other along the third direction (X), and the second empty foil area (121) has a ninth edge (1211) and a tenth edge (1212) disposed opposite to each other along the third direction (X). The ninth edge (1211) of the second empty foil area (121) coincides with the seventh edge (124) of the second electrode (120), and the second empty foil area (121) is disconnected from the second electrode (120) at the position of the tenth edge (1212).
8. The cell assembly according to claim 5, characterized in that, The stacked core (10) has a third direction (X), which is perpendicular to the first direction (Z) and the second direction (Y); The first electrode (110) has a first edge (113) and an eleventh edge (116) disposed opposite to each other along the second direction (Y), and the first electrode (110) has a third edge (114) and a fourth edge (115) disposed opposite to each other along the third direction (X); the first empty foil area (111) and the first notch area (112) are respectively disposed at both ends of the first edge (113), the first empty foil area (111) has a first inclined edge (1113), and the first inclined edge (1113) is disposed at an angle to the first edge (113) and the third edge (114) respectively; The second electrode (120) has a second edge (123) and a twelfth edge (126) disposed opposite to each other along the second direction (Y), and the second electrode (120) has a seventh edge (124) and an eighth edge (125) disposed opposite to each other along the third direction (X). The second empty foil area (121) and the second notch area (122) are respectively disposed at both ends of the second edge (123). The second empty foil area (121) has a second inclined edge (1213), which is disposed at an angle to the second edge (123) and the seventh edge (124).
9. The cell assembly according to claim 5, characterized in that, The battery cell assembly has a first surface (101) and a second surface (102) disposed opposite to each other along the thickness direction, and the blocking portion (220) extends toward the first surface (101); A portion of the first empty foil area (111) converges away from the first surface (101), and another portion of the first empty foil area (111) converges towards the first surface (101), with the two portions of the first empty foil area (111) approaching and converging with each other; and / or, a portion of the second empty foil area (121) converges away from the first surface (101), and another portion of the second empty foil area (121) converges towards the first surface (101), with the two portions of the second empty foil area (121) approaching and converging with each other; Alternatively, all of the first empty foil area (111) may converge in a direction away from the first surface (101); and / or all of the second empty foil area (121) may converge in a direction away from the first surface (101).
10. A battery, characterized in that, Includes the battery cell assembly as described in any one of claims 1 to 9.