Electrical connection assembly for a battery cell and battery cell
Patent Information
- Application Number
- CN202510172641.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-14
- Publication Date
- 2026-08-21
AI Technical Summary
[0005]在电池单元的组装和操作期间，由连接件和极耳占据的内部空间可能造成重大挑战
Smart Images
Figure CN122620106A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of battery technology, and more particularly to an improved design for electrical connection components in battery cells. Background Technology
[0002] In the field of battery technology, particularly in the design and construction of secondary batteries, there are ongoing challenges related to optimizing internal space and improving battery energy density and safety performance. A typical secondary battery includes electrode assemblies, a housing, and a cover. The electrode tabs of the electrode assemblies are fixed to the terminals of the cover by welding. This connection can be achieved using connectors.
[0003] In some examples, the battery casing consists of a prismatic battery canister and one or two caps (with or without one or two connecting elements) that hermetically seal the canister, as well as a stack (or jelly roll). The caps primarily comprise terminals, an upper insulating plastic layer, a substrate, and a lower insulating plastic layer. The battery canister is soldered to the substrate, and connecting elements are also soldered to the terminals and tabs of the battery stack. Connector assemblies with terminals and tabs occupy internal space within the battery canister.
[0004] CN 216389647U discloses a stacked battery connection structure, including a separate connection plate structure and a cover plate structure. The connection plate structure is designed to be fixedly and electrically connected to at least two stacked batteries and is foldable to achieve a compact battery stack. The cover plate structure has positive and negative terminals and is connected to the connection plate structure. The foldable connection plate structure ensures electrical connection while allowing the cover plate to be fitted onto the battery ends.
[0005] During the assembly and operation of battery cells, the internal space occupied by connectors and tabs can pose significant challenges. This excessive space consumption limits the size of electrode assemblies (such as battery packs or jelly rolls), thereby limiting the energy capacity of the battery. In addition, as battery thickness increases, the welding process between connectors and thicker electrode tabs becomes increasingly difficult, complicating the manufacturing process and potentially compromising weld integrity. Summary of the Invention
[0006] Therefore, the object of the present invention is to provide an improved design that solves at least some of the above-mentioned problems.
[0007] This objective is achieved by the electrical connection assembly according to independent claim 1 and the battery cell according to independent claim 12.
[0008] Other aspects of the invention are set forth in the dependent claims and in the following description of embodiments of the invention.
[0009] According to a first aspect, the present invention provides an electrical connection assembly for a battery cell. The electrical connection assembly includes: a connection plate for providing an electrical connection between electrode tabs of an electrode assembly and terminals of a cover; the connection plate includes: an electrode tab connection portion and a terminal connection portion for connecting the electrode tabs to the connection plate; a terminal connection tab attached to the terminal connection portion of the connection plate; and a frame including a receiving surface and a through-hole, the connection plate being disposed on the receiving surface, the through-hole allowing the electrode tabs to pass through and be folded onto the electrode tab connection portion.
[0010] A battery cell includes a housing or canister, which is an enclosure that seals and protects the internal components of the battery cell from external damage and environmental factors. Inside the housing, an electrode assembly is provided, for example, in the form of a Jelly Roll structure or a battery pack. The electrode assembly includes electrode tabs, which are conductive strips attached to one side of the electrode assembly.
[0011] The battery cell housing includes two covers, each containing terminals. Terminals are external connection points for the battery cell, typically marked as positive or negative. Each terminal is connected to a corresponding electrode tab (i.e., the negative or positive electrode tab). These terminals allow the battery cell to be integrated into a circuit or device, thereby enabling the transfer of electrical energy.
[0012] The electrical connection assembly is configured to establish an electrical connection between electrode tabs having the same polarity as the corresponding terminals of the corresponding caps. Specifically, the electrical connection assembly ensures that the negative electrode tab is connected to the negative terminal, or the positive electrode tab is connected to the positive terminal. In some examples, the battery cell according to the invention may include two electrical connection assemblies, one on each terminal side.
[0013] The connecting plate is a rigid component within the electrical connection assembly of a battery cell. The connecting plate is a flat, substantially planar structure made of a conductive material such as a metal or metal alloy. In some examples, the connecting plate may be made of aluminum. These materials are chosen based on their electrical conductivity and mechanical properties.
[0014] The connecting plate is used to establish an electrical connection between the electrode tabs of the electrode assembly and the terminals of the battery cover. It provides a path for current to flow from the electrode tabs to the terminals.
[0015] The connecting plate includes different parts designed to connect electrode tabs and terminals, namely, an electrode tab connection part for connecting electrode tabs to the connecting plate and a terminal connection part for connecting to terminals.
[0016] The electrode tab connection portion is a specific part of the connecting plate configured to engage with the electrode tabs of the electrode assembly. That is, the electrode tabs extending from the anode or cathode of the electrode assembly are connected to this portion of the connecting plate.
[0017] Terminal connection tabs are additional components of the electrical connection assembly, specifically designed to engage with the terminal connection portion of the connection plate. The terminal connection tabs are used to establish an electrical connection between the connection plate and the terminals of the cover.
[0018] By dividing the connecting plate into an electrode tab connection section and a terminal connection section, the folding and soldering positions between the electrode tab connection section and the terminal connection section can be clearly separated. This separation helps to reduce the internal space occupied by the electrical connection assembly.
[0019] The folding and welding positions refer to specific locations on the electrode tab connection portion and the terminal connection portion, where the electrode tab or terminal tab is folded and welded to the connection plate.
[0020] A frame (also known as an insulating support or stop frame) is a structured component within an electrical connection assembly. The frame provides mechanical support, ensures proper alignment of components (e.g., electrode tabs, electrode assemblies, connecting plates, etc.), and provides electrical insulation between the conductive parts of the battery cell.
[0021] The frame is typically made of an insulating material that prevents electrical short circuits and protects the internal components of the battery cell. It is designed to receive and hold the connection plates, ensuring that the electrode tabs and terminals are aligned and connected.
[0022] Both the connecting plate and the frame are arranged such that their large surface sides are positioned facing each other. For this purpose, the frame includes a receiving surface that accommodates the connecting plate and is designed to align with the frame-facing surface side of the connecting plate.
[0023] The frame includes through-holes that allow electrode tabs to pass through the frame (in the thickness direction) and be folded onto the tab connection portion of the connecting plate. Specifically, the through-holes are located in the peripheral region of the frame's surface facing the connecting plate, such that the electrode tabs pass through the frame and are folded onto the edge of the connecting plate, and then folded onto the electrode tab connection portion. The electrode tabs are folded on the connecting plate's surface facing away from the frame. This arrangement ensures that the electrode tabs are properly aligned and connected. This further ensures that the electrode tabs can be welded to the connecting plate. Furthermore, this folding arrangement minimizes the risk of electrode tabs penetrating the electrode assembly. Additionally, there is more space for folding the electrode tabs on the top side of the connecting plate, particularly in the direction perpendicular to the connecting plate.
[0024] The through-hole is designed to allow electrode tabs to pass through easily. The through-hole can have a slot-like shape, which is elongated and can accommodate electrode tabs (typically flag-shaped).
[0025] Terminal connector tabs are typically made of conductive materials, such as metals or metal alloys, chosen for their excellent conductivity and mechanical properties. Common materials include copper, aluminum, or nickel-plated steel, which ensure effective current handling and durability.
[0026] The terminal connector lug is designed to facilitate attachment and connection to terminals. It is typically flat and elongated, allowing it to be easily bent or folded. This flexibility benefits the assembly process, as it enables the terminal connector lug to adapt to various configurations and ensures a precise fit between the connector plate and the terminals.
[0027] The terminal connection tabs are attached to the terminal connection portion of the connection plate. This connection can be achieved by soldering, ensuring stable current and a conductive path.
[0028] This invention introduces an electrical connection assembly as an electrical connection between the electrode tabs and the terminals of the cover of an electrode assembly. This allows the interfaces between (i) the electrode tabs and the connecting plate, and (ii) the connecting plate and the terminal connecting tabs, to be arranged (separated) along the length of the connecting plate in a non-overlapping manner. Therefore, the electrical connection assembly can reduce the internal space of the electrode tab folds, which allows for larger stacking or jelly roll structures, thereby increasing battery energy. Furthermore, if the electrode tabs are too thick, they can be split in half their thickness, making soldering easier. Additionally, it separates the folding positions between the connector (sub-tab) and the tabs, which helps reduce internal space.
[0029] In some embodiments, the terminal connecting tabs may be configured to be flexible, as described above.
[0030] In some embodiments, the terminal connection tabs can be soldered to the terminal connection portion of the connection plate.
[0031] In some embodiments, the terminal connecting tabs and the connecting plate can be formed as a single piece. This means that the terminal connecting tabs are formed as an extension or integral part of the connecting plate itself, rather than as separate elements that are later connected / attached to the plate.
[0032] In some embodiments, the electrode tab connection portion and the terminal connection portion may be distributed along the longitudinal axis of the connecting plate. In other words, these two portions are located at different positions along the length of the connecting plate in a non-overlapping manner. The length of the connecting plate refers to the dimension of the plate extending along its longest side.
[0033] In some embodiments, the connecting plate may have a stepped shape, wherein the electrode tab connection portion is arranged on the higher portion of the step, and the terminal connection portion is arranged on the lower portion of the step.
[0034] The term "step shape" refers to a connecting plate having a construction with two or more different levels or layers, similar to the steps of a staircase. This means that the surface of the connecting plate is not flat, but has raised portions (higher portions) and recessed portions (lower portions). The electrode tab connection portions are located on the raised portions, while the terminal connection portions are located on the recessed portions.
[0035] The stepped shape of the connecting plate offers several advantages. By positioning the electrode tab connection portion at a higher level, it allows for easier access and alignment of the electrode tabs during the assembly process. This facilitates soldering or attaching the electrode tabs to the connecting plate, ensuring a safe and reliable connection.
[0036] Similarly, positioning the terminal connection portion at the lower level of the stepped shape allows for better alignment and connection with the terminals of the battery cover. This arrangement can help optimize the internal space within the battery cell, as the lower step, i.e., the recessed portion, provides space to accommodate the terminal connection tabs when they are folded or bent.
[0037] In some embodiments, the receiving surface of the frame can be configured to adapt to the shape of the connecting plate. For this purpose, the receiving surface of the frame is designed to match the stepped shape of the connecting plate. Specifically, the receiving surface of the frame is designed with corresponding raised and recessed portions that align with the higher and lower portions of the stepped connecting plate. In other words, the receiving surface of the frame is configured to match the stepped shape of the connecting plate, for example, to match the corresponding raised and recessed portions. Therefore, the receiving surface of the frame can serve as an assembly aid for precisely installing the connecting plate within the frame. This design ensures that the connecting plate is correctly oriented and securely positioned within the frame.
[0038] In some embodiments, the electrode tab connection portion may be divided into finger-like portions, each finger-like portion being configured to connect to the electrode assembly.
[0039] In some configurations, the electrode assembly may have a split electrode tab structure, where the electrode tabs are divided into smaller segments. This is often the case if a single electrode tab is too thick to be folded and / or welded. When the electrode tabs are divided into smaller and thinner segments, the welding process becomes easier. Specifically, each electrode tab portion can be welded individually, ensuring a safer and more reliable connection. To address this issue, the electrode tab connection portion of the connecting plate can be “divided into finger-like sections.” This means that the electrode tab connection portion is divided into two or more narrow segments resembling fingers. Each finger-like section is a separate segment of the electrode tab connection portion designed to connect to the split electrode tab. The finger-like sections extend from the terminal tab receiving portion along the longitudinal direction of the connecting plate.
[0040] A pair of separate electrode tabs are folded along the opposing longitudinal edges of their respective finger-like portions. This means that the electrode tabs, divided into multiple parts, are folded at the finger-like portions onto the edges of the connecting plate. These edges extend along the length of the finger-like portions. The separate electrode tabs are folded in this manner so that they wrap around the opposing sides of the finger-like portions.
[0041] In some embodiments, the connection plate of the electrical connection assembly includes additional electrode tab connection portions. Each of these electrode tab connection portions extends from an opposite side of the terminal connection portion. In other words, the electrode tab connection portions are located on different sides of the terminal connection portion and extend in opposite directions along the length of the connection plate.
[0042] This arrangement provides three distinct folding and welding locations: one for folding and welding the electrode tabs to the electrode tab connections on each side of the terminal connection portion, and one for folding and welding the terminal connection tabs to the terminal connection portion. This separation helps reduce the internal space occupied by the electrical connection components and facilitates easier and more reliable welding processes. Furthermore, this design allows for the connection of multiple electrode tabs to the connection plate.
[0043] In some embodiments, the connecting plate may have a cap-shaped profile. This configuration results in a cap-shaped profile of the connecting plate, wherein the electrode tab connection portions form the brim of the cap, while the terminal connection portions form the crown of the cap. This cap-shaped profile is similar to the stepped shape of the aforementioned connecting plate in that both electrode tab connection portions are located on the higher portion of the step, while the terminal connection portions are located on the lower portion of the step. The cap-shaped profile provides the same benefits of improved alignment, secure attachment, and optimized space utilization.
[0044] To accommodate the cap-shaped profile of the connecting plate, the receiving surface of the frame is designed to correspond to this shape. Specifically, the receiving surface of the frame includes corresponding raised and recessed portions that align with the brim and crown of the cap-shaped connecting plate. This design ensures that the connecting plate is correctly oriented and securely placed within the frame, thus providing a shape-locking fit and serving as an assembly aid for installing the connecting plate into the frame.
[0045] In some embodiments, the frame may also include a protrusion on the side opposite the receiving surface for bending electrode tabs.
[0046] The protruding portion on the side opposite the receiving surface of the frame is an extension or protrusion designed to bend the electrode tab toward the through-hole, which extends from the electrode assembly toward the frame. This guiding function ensures that the electrode tab is properly shaped as it passes through the through-hole, thus facilitating its passage through the frame. Furthermore, in the assembled state of the battery cell, the protruding portion maintains the bend in the electrode tab, thereby reducing undesirable movement of the electrode tab.
[0047] The protruding portion extends outward from the side of the frame and has a surface along which the electrode tabs can be aligned to guide them toward the through hole.
[0048] According to a second aspect, the present invention provides a battery cell comprising a housing, a first cover including a positive terminal, a second cover including a negative terminal, an electrode assembly disposed in the housing, a (first) electrical connection assembly for the positive terminal side and / or a (second) electrical connection assembly for the negative terminal side, the electrode assembly including a positive electrode tab and a negative electrode tab. The first and second electrical connection assemblies are constructed as described above.
[0049] In some examples, the battery cell is a prismatic battery cell.
[0050] The housing serves as the outer casing of the battery cell. The electrode assemblies are located within the housing. The electrode assemblies can be in the form of a jelly roll structure or a battery pack. In some examples, the housing may house two or more electrode assemblies.
[0051] The electrode assembly comprises multiple layers of positive and negative electrode materials, each layer of which is separated by a separator. Therefore, the electrode assembly has at least two electrode tabs, one for the anode layer and the other for the cathode layer. A negative electrode tab connected to the anode layer and a positive electrode tab connected to the cathode layer extend from opposite sides of the electrode assembly. Each electrode tab of the electrode assembly extends toward a corresponding cover.
[0052] The battery cell is equipped with two covers, each of which includes terminals located at opposite ends of the housing. The terminals on the covers serve as external connection points for the battery cell. These terminals are typically marked as positive or negative and are designed to connect the battery cell to external circuitry or devices.
[0053] A first electrical connection assembly is arranged to electrically connect a positive electrode tab to the positive terminal of a first cover, and a second electrical connection assembly is arranged to electrically connect a negative electrode tab to the negative terminal of a second cover. The first electrical connection assembly is located between the first cover, including the positive terminal, and the side of the electrode assembly having the positive electrode tab. Correspondingly, the second electrical connection assembly is located between the second cover, including the negative terminal, and the side of the electrode assembly having the negative electrode tab.
[0054] In some embodiments, each of the negative and positive electrode tabs passes through a corresponding through-hole in the corresponding frame and folds onto the surface of the corresponding electrode tab connection portion of the corresponding connecting plate, which is opposite to the receiving surface of the frame. In other words, the negative electrode tab passes through a through-hole in the frame of the second electrical connection assembly and is folded onto the connecting plate to establish a strong and effective electrical connection. Similarly, the positive electrode tab passes through a through-hole in the frame of the first electrical connection assembly and is folded onto the connecting plate.
[0055] The contact surface of the electrode tab connection portion of the connecting plate faces the receiving surface of the frame. The connecting plate has two large surfaces: one that contacts the receiving surface of the frame, and another that faces it. The surface of the connecting plate that contacts the receiving surface of the frame is called the "electrode-side surface" because it faces the direction of the electrode assembly. The "cover-side surface" of the connecting plate, which faces the electrode-side surface, faces the cover. The electrode tabs are folded and welded to this cover-side surface.
[0056] In some embodiments, the battery cell may include two electrode assemblies, each electrode assembly including a corresponding electrode tab. Each electrode tab passes through a corresponding through-hole disposed in the frame of the electrical connection assembly.
[0057] That is, in these embodiments, each of the two electrode assemblies has its negative tab and its positive tab, resulting in a total of two negative tabs and two positive tabs. Therefore, the frame of the first electrical connection assembly associated with the positive terminal includes two through holes for receiving the positive tabs of the two electrode assemblies. Correspondingly, the frame of the second electrical connection assembly associated with the negative terminal includes two through holes for receiving the negative tabs of the two electrode assemblies. This ensures that the frame has a corresponding number of through holes to accommodate the number of positive or negative tabs, thereby ensuring proper alignment and connection of the electrode tabs with the connection plate. Therefore, the number of through holes corresponds to the number of electrode tabs.
[0058] In some embodiments, the electrode assembly may be a battery pack or a Jelly Roll structure.
[0059] Battery pack construction involves stacking multiple layers of positive and negative electrode materials separated by separators to form a compact and efficient structure. Alternatively, a Jelly Roll structure involves winding the positive and negative electrode material layers together with separators into a cylindrical or prismatic shape.
[0060] In some embodiments, an electrical connection assembly may be provided only for the positive or negative terminal side. In these embodiments, other arrangements for connecting the electrode tabs to the terminal side may be provided without using an electrical connection assembly. Attached Figure Description
[0061] Embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, wherein:
[0062] Figure 1 An exploded view of a battery cell according to the first embodiment is shown;
[0063] Figure 2 A perspective view from the bottom Figure 1 The positive terminal side of the battery cell;
[0064] Figure 3 A perspective view from the top Figure 1 The positive terminal side of the battery cell;
[0065] Figure 4a This shows a view of the battery cell in a direction perpendicular to the positive electrode cover;
[0066] Figure 4b A cross-sectional view along line AA shown in Figure 4A is shown;
[0067] Figure 4c It shows along Figure 4a The cross-sectional view of line BB shown.
[0068] Figure 5a A battery cell according to a second embodiment is shown;
[0069] Figure 5b A battery cell according to a third embodiment is shown;
[0070] Figure 5c A battery cell according to a fourth embodiment is shown; and
[0071] Figure 5d A battery cell according to a fifth embodiment is shown. Detailed Implementation
[0072] Figure 1 An exploded view of a battery cell 100 according to a first embodiment is shown. The battery cell 100 includes a housing 20 and two covers 10 that enclose the housing 20. The housing 20 houses two electrode assemblies 30, each electrode assembly being formed as a battery pack. Each electrode assembly 30 includes two positive electrode tabs 31, although... Figure 1 Not shown, but each electrode assembly 30 has two negative tabs.
[0073] The following text describes the process of... Figure 1 The positive terminal side portion of the battery cell 100 shown in the upper part is described below accordingly. Figure 1 The lower part shows the negative terminal side of the battery cell 100.
[0074] The battery cell 100 also includes a first electrical connection assembly for the positive terminal side. The first electrical connection assembly connects the positive electrode tab 31 to the positive terminal 11 of the cover 10. The first electrical connection assembly includes a frame (stop frame) 40, a connecting plate 50, and a terminal connection tab 60. In some examples, the connecting plate 50 may be made of an aluminum sheet with a thickness of 1 mm. In some examples, the terminal connection tab 60 may be formed from several layers of aluminum foil, which together reach a thickness of 1 mm, for example, ten layers, each with a thickness of 0.1 mm. In some examples (not shown), the connecting plate 50 and the terminal connection tab 60 may be formed as a single piece. In this case, the single piece may be formed from several layers of aluminum foil, for example, ten layers, each with a thickness of 0.1 mm, such that the single piece reaches a total thickness of 1 mm.
[0075] A frame 40 is arranged on one side of the positive electrode tab 31 of the electrode assembly 30, extending therefrom. A connecting plate 50 is placed inside the frame 40. A cover 10 is placed on top of the connecting plate 50, thereby closing the housing 20. The frame 40 includes a receiving surface facing away from the electrode assembly 30, which is configured to mate with the connecting plate 50 to ensure proper alignment and secure placement. In the state of the battery cell 100, the frame 40 also applies a force (perpendicular to the side of the electrode assembly on which the frame 40 is arranged) to press the electrode assembly 30 against the wall of the housing 20.
[0076] Figure 2 The positive terminal side of the battery cell 100 is shown, in which the positive terminal 11 of the cover 10 can be seen. This terminal 11 serves as an external connection point for the battery cell 100.
[0077] like Figure 3 As shown, the connecting plate 50 has two electrode tab connection portions 51 and one terminal tab connection portion 53. The two electrode tab connection portions 51 extend from opposite sides of the terminal tab connection portion 53 along the longitudinal direction of the connecting plate 50. Figure 3 In the example shown, the connecting plate 50 has a (inverted) hat-shaped profile, wherein the electrode tab connection portion 51 forms the brim of the hat, and the terminal connection portion 51 forms the crown of the hat. In other words, the two electrode tab connection portions 51 are raised portions of the connecting plate 50, and the terminal tab connection portion 53 is a recessed portion.
[0078] Therefore, a folding area for connecting the terminal lugs 60 between the connecting plate 50 and the terminal 11 is provided in the central portion of the connecting plate 50 (and the cover 10). Furthermore, folding areas for connecting the electrode lugs 31 between the connecting plate 50 and the electrode assembly 30 are provided on both end sides of the connecting plate 50 (and the cover 10). This arrangement allows for the separation of the folding position and the welding position, as will be discussed later. Figures 4a-4cIn more detail, this helps reduce the internal space occupied by electrical connection components and facilitates a more streamlined soldering process.
[0079] like Figure 1 and Figure 3 As shown, the connecting plate 50 has a stepped shape (cap shape), wherein the electrode tab connection portion 51 is arranged on the higher portion of the step, and the terminal connection portion 53 is arranged on the lower portion of the step. The receiving surface 41 of the frame 40 is designed to match this stepped shape. The matching design of the frame 40, especially the receiving surface 41, with the stepped connecting plate 50 provides assembly assistance for arranging the connecting plate within the frame 40. This alignment ensures that the connecting plate 50 is correctly placed within the frame 40.
[0080] Figure 4a This is a view of the battery cell 100 in a direction perpendicular to the positive electrode cover 10.
[0081] Figure 4b It is along Figure 4a The cross-sectional view of line AA shown illustrates the battery cell 100 in its assembled state and the electrical connection between the terminal 11 and the connecting plate 50. In this view, the terminal connection tabs 60 are arranged as separate elements and folded over the longitudinal edge of the connecting plate 50 in the terminal connection portion 53. Figure 4b As shown, the lower part of the terminal connecting tab 60 is located between the frame 40 and the connecting plate 50, while the upper part of the terminal connecting tab 60 is located between the connecting plate 50 and the terminal 11.
[0082] The bending of the terminal connecting tab 60 facilitates the welding of the terminal connecting tab 60 to the terminal 11. Specifically, during the assembly of the battery cell 100, the lower part of the terminal connecting tab 60 is first welded to the connecting plate 50, and then the upper part of the terminal connecting tab 60 is welded to the terminal 11, which establishes an electrical connection between the connecting plate 50 and the terminal 11. Finally, the cover 10 is placed on the housing 20 to close it.
[0083] Figure 4c It is along Figure 4a The cross-sectional view of line BB shown is illustrated. This view shows the electrical connection between the electrode tabs 31 and the connecting plate 50. Each electrode tab 31 passes through a corresponding through-hole 43 in the frame 40, and then the electrode tab 31 is folded over the longitudinal edge of the connecting plate 50. On the surface of the electrode tab connection portion 51 facing the cover 10, i.e., the cover-side surface of the connecting plate 50, the electrode tab 31 is welded to the cover-side surface at the electrode tab connection portion 51, thereby establishing an electrical connection between the electrode tab 31 and the connecting plate 50.
[0084] Additionally, the frame 40 includes a protrusion 45 configured to bend the electrode tabs 31 and guide them into a shape passing through the through-hole 43. In this example, the cross-section of the protrusion 45 is triangular. However, other shapes are also possible, such as semicircles. Typically, the shape of the protrusion 45 can depend on the shape of the electrode tabs 31, which is naturally produced by bending them.
[0085] Figure 5a The positive terminal side portion of the battery cell 100 according to the second embodiment is shown. In this embodiment, each positive electrode tab 31 is divided into a pair of smaller electrode tab portions 31a. Correspondingly, the electrode tab connection portion 51 of the connecting plate 50a is also divided into finger portions 51a, each finger portion 51a being configured to receive a corresponding pair of electrode tab segments 31a. The frame 40a in this embodiment includes the same number of through holes 43 as the electrode tab segments 31a. Dividing the electrode tabs 31 into smaller portions 31a helps reduce the thickness of each individual electrode tab 31, and this separate construction allows for easier folding and welding of the electrode tab segments 31a to the finger portions 51a of the connecting plate 50b, thereby ensuring a safe and reliable electrical connection. Figure 5a The structure shown is suitable for thicker battery cells including electrode tabs 31 with more tab layers.
[0086] Figure 5b The positive terminal side portion of the battery cell 100 according to the third embodiment is shown. In this embodiment, only one electrode assembly 30b is disposed within the housing 20, and the connecting plate 50b is connected to... Figures 1 to 4c The connecting plate 50 shown is identical. The electrode assembly 30b has two positive electrode tabs 31b, which are connected to the connecting plate 50b in the same manner as described above. The frame 40b in this embodiment includes the same number of through holes 43 as the positive electrode tabs 31b. Figure 5b The structure shown is suitable for thinner battery cells including electrode tabs 31 with fewer tab layers, since typically only two electrode tabs 31 need to be assembled and welded.
[0087] Figure 5c The positive terminal side portion of a battery cell 100 according to a fourth embodiment is shown. This embodiment is similar to the first embodiment in that it also includes two electrode assemblies 30; however, in this embodiment, each electrode assembly 30 has only one positive electrode tab 31, and the connecting plate 50c in this embodiment has only one electrode tab connection portion 51c. In the example shown, the connecting tab 60c is formed as a single piece. The terminal connecting tab 60c is folded perpendicular to the longitudinal axis of the connecting plate 50c. In other examples (not shown), the terminal connecting tab 60c may be integrally formed with the connecting plate 50c, meaning they are a single component. Figure 5cThe configuration shown allows for changing the folding direction of the terminal connecting tab 60c (compared to other embodiments).
[0088] Figure 5d The positive terminal side portion of the battery cell 100 according to the fifth embodiment is shown. This embodiment is similar to the fourth embodiment in that it also includes two electrode assemblies 30; however, in this embodiment, each electrode assembly 30 has only one positive electrode tab 31, and the connecting plate 50d in this embodiment has only one positive electrode tab connection portion 51. The terminal connecting tab 60 is connected to the connecting plate 50d as described with respect to the first embodiment. Specifically, the terminal connecting tab 60 is a separate element folded in the terminal connecting portion 53 onto the longitudinal edge of the connecting plate 50b, utilizing… Figure 5d The configuration shown can reduce the number of electrode tabs 31 and welding time when there is sufficient space for the width of the electrode assembly 30.
[0089] Figure Labels
[0090] 10 Cover
[0091] 11 terminals
[0092] 20. Housing
[0093] 30 Electrode Assembly
[0094] 30 Electrode Assembly
[0095] 31 Positive electrode tab
[0096] 31a Smaller electrode tab section
[0097] 31b Positive electrode tab
[0098] 40 Frame (Stop Frame)
[0099] 41 Receiving Surface
[0100] 43 Through hole
[0101] 45. Protrusion
[0102] 50 Connecting plate
[0103] 50b connecting plate
[0104] 50c connecting plate
[0105] 50d connecting board
[0106] 51 Electrode tab connection part
[0107] 51a Finger-shaped part (separate electrode tab connection part)
[0108] 53 Terminal tab connection part
[0109] 60 terminal connection tabs
[0110] 60C terminal connection tab
[0111] 100 battery cells
Claims
1. An electrical connection assembly for a battery cell (100), comprising: - Connecting plate (50; 50a-c), the connecting plate being used to provide an electrical connection between the electrode tabs (31) of the electrode assembly (30) and the terminals (11) of the cover (10), the connecting plate (50; 50a-c) including an electrode tab connecting portion (51) for connecting the electrode tabs (31) to the connecting plate (50; 50a-c) and a terminal connecting portion (53) to be connected to the terminals (11); - Terminal connecting tabs (60; 60c), said terminal connecting tabs being attached to the terminal connecting portion (53) of said connecting plate (50; 50a-c); as well as - Frame (40), the frame including receiving surface (41) and through hole (43), the connecting plate (50; 50a-c) is arranged on the receiving surface, and the through hole is for allowing the electrode tab (31) to pass through and be folded onto the electrode tab connection portion (51).
2. The electrical connection assembly of claim 1, wherein the terminal connecting tabs (60; 60c) are configured to be flexible.
3. The electrical connection assembly according to claim 1 or 2, wherein the terminal connection tabs (60; 60c) are soldered to the terminal connection portion (53) of the connection plate (50; 50a-c).
4. The electrical connection assembly according to claim 1 or 2, wherein the terminal connecting tab (60; 60c) and the connecting plate (50; 50a-c) are formed as a single piece.
5. The electrical connection assembly according to any one of the preceding claims, wherein the electrode tab connection portion (51) and the terminal connection portion (53) are distributed along the longitudinal axis of the connection plate (50; 50a-c).
6. The electrical connection assembly according to any one of the preceding claims, wherein the connection plate (50; 50a-c) has a stepped shape, wherein the electrode tab connection portion (51) is disposed on the higher portion of the step, and the terminal connection portion (53) is disposed on the lower portion of the step.
7. The electrical connection assembly according to any one of the preceding claims, wherein the receiving surface (41) of the frame (40) is configured to adapt to the shape of the connection plate (50; 50a-c).
8. The electrical connection assembly according to any one of the preceding claims, wherein the electrode tab connection portion (51) is divided into finger portions (51a), each finger portion (51a) being configured to be connected to a corresponding electrode assembly (30).
9. The electrical connection assembly according to any one of the preceding claims, wherein the connection plate (50; 50a-c) includes additional electrode tab connection portions (51), wherein each electrode tab connection portion (51) extends from the opposite side of the terminal connection portion (53).
10. The electrical connection assembly of claim 9, wherein the connection plates (50; 50a-c) have a cap-shaped profile.
11. The electrical connection assembly according to any one of the preceding claims, wherein the frame (40) further includes a protrusion (45) for bending the electrode tab (31) on the side opposite to the receiving surface (41).
12. A battery cell (100), comprising: -Shell (20); - First cover (10), the first cover includes a positive terminal (11); - Second cover (10), the second cover includes negative end (11); - An electrode assembly (30) is disposed in the housing (20), the electrode assembly (30) including a positive electrode tab (31) and a negative electrode tab (31). The battery cell (100) further includes an electrical connection component according to any one of the preceding claims for the positive terminal side and / or an electrical connection component according to any one of the preceding claims for the negative terminal side.
13. The battery cell (100) according to claim 12, wherein the negative electrode tab and / or the positive electrode tab (31) pass through the corresponding through hole (43) of the corresponding frame (40) and are folded onto the surface of the corresponding electrode tab connection portion (51) of the corresponding connecting plate (50; 50a-c), the surface being opposite to the receiving surface (41) of the frame (40).
14. The battery cell (100) according to claim 12 or 13, wherein the battery cell (100) comprises two electrode assemblies (30), each electrode assembly comprising a corresponding electrode tab (31), wherein, Each of the electrode tabs (31) passes through a corresponding through hole (43) provided in the frame (40).
15. The battery cell (100) according to any one of claims 12 to 14, wherein the electrode assembly (30) is a battery pack or a Jelly Roll structure.