Multi-tab battery cell structure and battery

Abstract

The utility model provides a multi-tab battery cell structure and a battery, and relates to the technical field of batteries, the multi-tab battery cell structure comprises a first pole piece, a second pole piece, a diaphragm and a connecting piece, the polarity of the second pole piece is opposite to that of the first pole piece, a plurality of tab pieces are arranged at intervals along the length direction of the second pole piece, and each tab piece comprises an insulating area and an empty foil area. And the diaphragm is abutted between the first pole piece and the second pole piece. The first pole piece, the second pole piece and the diaphragm are wound to form a roll core body, any tab piece extends towards the same end of the roll core body, the plurality of tab pieces are arranged together, empty foil areas of the plurality of tab pieces are welded together, the connecting piece abuts against the tab pieces, and the connecting piece is parallel to the axis of the roll core body. According to the utility model, the plurality of tabs on the second pole piece are welded together, and the insulating areas of the tabs avoid the risk of short circuit of the tabs and the first pole piece of the roll core body, so that the production efficiency is improved, and the risk of wrinkling or breaking caused by overlong tabs is avoided.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a multi-tab cell structure and battery. Background Technology

[0002] Battery cell tabs are conductive elements used to connect the positive and negative terminals inside the battery cell to the external circuit, playing a crucial role in transmitting current and ensuring that the battery can power external devices. Common battery cell tab designs suffer from issues such as excessive length leading to wrinkles or breakage. When current flows through these tabs, they are prone to overheating or short circuits, affecting normal battery operation and even posing safety risks. Utility Model Content

[0003] The purpose of this utility model is to provide a multi-tab battery cell structure and battery, which reduces the occurrence of overheating or short circuits in the battery cell structure, avoids the risk of wrinkles or breakage caused by excessively long tabs, ensures the product performance of the tabs, and thus improves the current carrying capacity and safety of the battery cell structure.

[0004] The first aspect of this utility model provides a multi-tab battery cell structure, which includes:

[0005] First electrode plate;

[0006] The second electrode has the opposite polarity to the first electrode and has a plurality of tabs spaced apart along its length. Each tab includes an insulating region and an empty foil region. The insulating region is located close to the second electrode and the empty foil region is located at the end of the insulating region away from the second electrode.

[0007] A diaphragm is abutted between the first electrode and the second electrode. The first electrode, the second electrode, and the diaphragm are wound together to form a core. Each of the electrode tabs extends toward the same end of the core. Multiple electrode tabs are clustered together, and the empty foil areas of the multiple electrode tabs are welded together.

[0008] A connector that abuts against the tab and is parallel to the axis of the core.

[0009] In one possible embodiment of this utility model, the empty foil areas of a plurality of electrode tabs are welded together at a welding point to form an electrode tab body. The electrode tab body has a conical structure, and the axis of the electrode tab body is not collinear with the axis of the core body.

[0010] In one possible embodiment of this utility model, a central hole is provided through the center of the core body, and the connector is located on the axis of the tab body away from the central hole.

[0011] In one possible embodiment of the present invention, the plurality of tabs on the core body are arranged linearly along the radial direction of the core body.

[0012] In one possible embodiment of the present invention, the adjacent tabs on the core body have an offset angle θ along the radial direction of the core body, satisfying 0≤θ≤30°.

[0013] In one possible embodiment of this utility model, the insulating region is provided with a chamfered portion, which is located close to the second electrode plate.

[0014] In one possible embodiment of this utility model, the shape of the electrode is one of a rectangle, a trapezoid, or a parallelogram.

[0015] In one possible embodiment of this utility model, the length of the tab is L and the radius of the core is R1, satisfying: R1≤L≤2R1.

[0016] In one possible embodiment of this utility model, the radius of the central hole is R2, and the width of the tab is D, satisfying: R2≤D.

[0017] A second aspect of this utility model provides a battery comprising the multi-tab cell structure described in any of the above embodiments.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a multi-tab battery cell structure and battery, which welds multiple tabs on the second electrode sheet together. The connector abuts against the tabs to achieve electrical connection between the multiple tabs and the connector. The empty foil area of ​​the multiple tabs can conduct current through the connector. The insulating area of ​​the tabs avoids the risk of short circuit between the tabs and the first electrode sheet in the core body, reducing the occurrence of overheating or short circuits in the battery cell structure. The multiple tabs are clustered together and extend towards the same end of the core body during the welding process, which is conducive to the automated production of the multi-tab battery cell structure, thereby improving production efficiency. The connector achieves the purpose of extending and expanding the length of the multiple tabs, avoiding the risk of wrinkles or breakage caused by excessive length of the tabs in the production process, ensuring the product performance of the tabs, and thus improving the current carrying capacity and safety of the battery cell structure. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of the multi-pole battery cell structure provided in some embodiments of the present invention. Figure 1 ;

[0021] Figure 2 This is a flowchart illustrating the multi-pole battery cell structure provided in some embodiments of the present invention;

[0022] Figure 3 This is a schematic diagram of the electrode assembly of the multi-electrode battery cell structure provided in some embodiments of this utility model;

[0023] Figure 4 This is a schematic diagram of the multi-pole battery cell structure provided in some embodiments of the present invention. Figure 2 .

[0024] Explanation of key component symbols;

[0025] 100 - Multi-tab cell structure; 110 - Tab body; 111 - Tab component; 1111 - Insulation area; 1111a - Chamfered part; 1112 - Empty foil area; 120 - Core body; 121 - Center hole; 130 - Connector; X - First direction. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, 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 this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0031] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0033] refer to Figure 1 and Figure 2 As shown, an embodiment of this application provides a multi-pole battery cell structure 100, which includes a first electrode, a second electrode, a diaphragm, and a connector 130.

[0034] Specifically, in combination Figure 2 and Figure 3 As shown, the second electrode has the opposite polarity to the first electrode. Multiple tabs 111 are spaced apart along the length of the second electrode. Each tab 111 includes an insulating region 1111 and an empty foil region 1112. The insulating region 1111 is located close to the second electrode, and the empty foil region 1112 is located at the end of the insulating region 1111 away from the second electrode. The diaphragm abuts between the first electrode and the second electrode.

[0035] In this embodiment, the first electrode, the second electrode, and the diaphragm are wound together to form a core 120. Each of the electrode tabs 111 extends towards the same end of the core 120. Multiple electrode tabs 111 are clustered together, and the empty foil areas 1112 of the multiple electrode tabs 111 are welded together. The connector 130 abuts against the electrode tabs 111, and the connector 130 is parallel to the axis of the core 120. Multiple electrode tabs on the second electrode are welded together. The connector 130 abuts against the electrode tabs to achieve electrical connection between the multiple electrode tabs and the connector 130. The empty foil areas 1112 of the multiple electrode tabs can be connected through the connector. 130 conducts current, and connector 130 serves as a connection and current convergence point. The insulation area 1111 of the tab avoids the risk of short circuit between the tab and the first electrode in the core body 120, reducing the possibility of overheating or short circuit in the cell structure. Multiple tabs are clustered together during the welding process and extend towards the same end of the core body 120, which facilitates the automated production of the multi-tab cell structure 100 and improves production efficiency. Connector 130 extends and expands the length of multiple tabs, avoiding the risk of wrinkles or breakage caused by excessively long tabs in the production process, ensuring the product performance of the tabs, and thus improving the current carrying capacity and safety of the cell structure.

[0036] The first electrode and the second electrode can be positive and negative electrodes, respectively. For example, the first electrode can be negative and the second electrode can be positive. Alternatively, the first electrode can be positive and the second electrode can be negative. The negative electrode stores lithium ions that migrate from the positive electrode, while the positive electrode stores and releases a portion of the electrochemically active material. During charging, lithium ions are extracted from the positive electrode and embedded in the negative electrode. During discharging, lithium ions return from the negative electrode to the positive electrode. The separator is located between the positive and negative electrodes, acting as a physical barrier to prevent direct contact and short circuits. It also allows lithium ions to pass through its microporous structure for ion transport during charging and discharging.

[0037] It's understandable that a multi-tab design reduces internal resistance, meets the cell's current-carrying capacity, and improves the battery's high-rate charge / discharge capability. Simultaneously, the resistance is significantly reduced; multi-tab designs have a significantly lower internal resistance than single-tab designs and can meet the cell's safety requirements. In related technologies, common multi-tab cells typically involve bending and welding multiple tabs to the current collector, and then welding them to the battery cap. This can easily lead to tab breakage, and the tabs may develop wrinkles or bends, hindering automated battery production and resulting in low production efficiency.

[0038] In one embodiment, optionally, combining Figure 1 and Figure 2As shown, the empty foil areas 1112 of multiple tabs 111 are welded together at a welding point to form a tab body 110, which simplifies the process and enhances the uniformity of the conductive path of the tab body 110. The tab body 110 has a conical structure, and the axis of the tab body 110 is not collinear with the axis of the core body 120. The position of the tab body 110 is not on the axis of the core body 120, that is, the tab body 110 is located at the edge of the core body 120. This reduces the obstruction and interference of the tab body 110 to the core body 120 in the battery manufacturing process. For example, it can be used for liquid injection operation of the core body 120 and battery top cover sealing, and provide external connection ports. It optimizes the spatial layout, facilitates modular assembly, ensures the manufacturing yield of the core body 120, and thus improves production efficiency.

[0039] Optionally, such as Figure 2 As shown, a central hole 121 is provided through the center of the core body 120. The connector 130 is located on the axis of the tab body 110 away from the central hole 121, ensuring that the connection path between the connector 130 and the tab body 110 avoids the area of ​​the central hole 121 of the core body 120, reducing the impact and obstruction on the core body 120. The axial offset of the tab body 110 and the position of the central hole 121 form a spatial misalignment, maximizing the use of internal space. During the installation of the battery top cover, the laser welding point is on the connector 130 and does not coincide with the welding point of the tab body 110, avoiding repeated welding at the same position, which could lead to poor welding or damage to the tab body 110. This ensures a sealed weld between the top cover and the battery casing, meeting the requirements for electrical insulation and mechanical strength.

[0040] In summary, the multi-tab battery cell structure 100 welds multiple tabs on the second electrode sheet together. The connector 130 abuts against the tabs to achieve electrical connection between the multiple tabs and the connector 130. The empty foil area 1112 of the multiple tabs can conduct current through the connector 130. The insulation area 1111 of the tabs avoids the risk of short circuit between the tabs and the first electrode sheet in the core body 120, reducing the possibility of overheating or short circuit in the battery cell structure. The multiple tabs are clustered together and extend towards the same end of the core body 120 during the welding process, which is conducive to the automated production of the multi-tab battery cell structure 100 and thus improves production efficiency. The connector 130 achieves the purpose of extending and expanding the length of the multiple tabs, avoiding the risk of wrinkles or breakage caused by excessive length of the tabs in the production process, ensuring the product performance of the tabs, and thus improving the current carrying capacity and safety of the battery cell structure.

[0041] refer to Figure 1 As shown, embodiments of this application provide another multi-pole battery cell structure 100, which includes a first electrode, a second electrode, a diaphragm, and a connector 130.

[0042] Specifically, in combination Figure 2 and Figure 3 As shown, the second electrode has the opposite polarity to the first electrode. Multiple tabs 111 are spaced apart along the length of the second electrode. Each tab 111 includes an insulating region 1111 and an empty foil region 1112. The insulating region 1111 is located close to the second electrode, and the empty foil region 1112 is located at the end of the insulating region 1111 away from the second electrode. The diaphragm abuts between the first electrode and the second electrode. The first electrode, the second electrode, and the diaphragm are wound together to form a core body 120. Each of the electrode tabs 111 extends toward the same end of the core body 120. Multiple electrode tabs 111 are clustered together, and the empty foil areas 1112 of the multiple electrode tabs 111 are welded together. A connector 130 abuts against the electrode tabs 111. The connector 130 is parallel to the axis of the core body 120, and the multiple electrode tabs on the second electrode are welded together. The connector 130 abuts against the electrode tabs to achieve electrical connection between the multiple electrode tabs and the connector 130. The empty foil areas 1112 of the multiple electrode tabs... 2. The connector 130 can conduct current, and the insulation area 1111 of the tab avoids the risk of tab short circuit in the core body 120, reducing the occurrence of heat generation or short circuit in the cell structure. Multiple tabs are clustered together during the welding process and extend towards the same end of the core body 120, which is conducive to the automated production of the multi-tab cell structure 100, thereby improving production efficiency. The connector 130 achieves the purpose of extending and expanding the length of multiple tabs, avoiding the risk of wrinkles or breakage caused by excessive length of tabs in the production process, ensuring the product performance of the tabs, and thus improving the current carrying capacity and safety of the cell structure.

[0043] In one embodiment, optionally, combining Figure 1 and Figure 2 As shown, the empty foil areas 1112 of multiple tabs 111 are welded together at a welding point to form a tab body 110, which simplifies the process and enhances the uniformity of the conductive path of the tab body 110. The tab body 110 has a conical structure, and the axis of the tab body 110 is not collinear with the axis of the core body 120. The position of the tab body 110 is not on the axis of the core body 120, that is, the tab body 110 is located at the edge of the core body 120, which reduces the obstruction and interference of the tab body 110 to the core body 120 in the battery manufacturing process, such as the liquid injection operation of the core body 120, optimizes the spatial layout, facilitates modular assembly, ensures the manufacturing yield of the core body 120, and thus improves production efficiency.

[0044] Furthermore, the tab 110 is coated with rubber to prevent electrolyte residue from remaining on the tab 110 during the electrolyte injection process, and to prevent the tab 111 from breaking or tearing when it is bent in the subsequent battery production process, thereby further improving the battery production yield.

[0045] Optionally, such as Figure 2 As shown, a central hole 121 is provided through the center of the core body 120. The connector 130 is located on the axis of the tab body 110 away from the central hole 121, ensuring that the connection path between the connector 130 and the tab body 110 avoids the area of ​​the central hole 121 of the core body 120, reducing the impact and obstruction on the core body 120. The axial offset of the tab body 110 and the position of the central hole 121 form a spatial misalignment, maximizing the use of internal space. When the tab body 111 is bent in subsequent manufacturing processes, the connector 130 is prevented from touching the diaphragm, which could cause a short circuit in the core body 120. For example, the connector 130 is a connecting strip made of aluminum.

[0046] In one embodiment, optionally, the plurality of tabs 111 on the core body 120 are arranged linearly along the radial direction of the core body 120, that is, the plurality of tabs 111 are linearly arranged on the core body 120, so that the plurality of tabs 111 are stacked and concentrated in a local area of ​​the core body 120, reducing the occupation of the end circumferential area of ​​the core body 120. The concentrated arrangement of the plurality of tabs can shorten the lead-out path of the tabs, so as to facilitate the gathering of the plurality of tabs 111 to form a tab body 110, shorten the internal current path, reduce the local temperature rise caused by resistance heat, and reduce the risk of leakage of the core body 120.

[0047] In one embodiment, alternatively, such as Figure 4 As shown, adjacent tabs 111 on the core 120 are offset by an angle θ along the radial direction of the core 120, satisfying 0 ≤ θ ≤ 30°. That is, there is a certain angular offset between adjacent tabs 111. When θ = 0°, the tabs are arranged completely linearly. When θ = 30°, the arrangement direction of adjacent tabs is offset by 30° in the circumferential direction from the radial direction, forming a spiral structure or fan-shaped distribution. On the one hand, this avoids the multiple tabs 111 occupying too much space in a circumferential arrangement, ensuring stress balance among the multiple tabs 111 and preventing breakage or tearing. On the other hand, it ensures heat dissipation when multiple tabs 111 are densely distributed. For example, the number of tabs 111 is in the range of six to twenty-two.

[0048] Optionally, in one embodiment, the insulating region 1111 is provided with a chamfered portion 1111a, which is located close to the second electrode. This provides sufficient connection range between the insulating region 1111 and the second electrode. The chamfered portion 1111a prevents the tab 111 from collapsing, thus reducing the likelihood of breakage or tearing. Furthermore, two chamfered portions 1111a are respectively located at opposite ends of the insulating region 1111.

[0049] For example, the insulating region 1111 is coated with a ceramic coating so that the insulating region 1111 can play an insulating role and prevent the second electrode from being connected to the first electrode and causing a short circuit. For example, the height of the insulating region 1111 is 2mm.

[0050] Optionally, the shape of the tab 111 is one of a rectangle, a trapezoid, or a parallelogram. Further, if the tab 111 is rectangular, when θ = 5° to 10°, the long side along the offset direction can reduce the gap between the tabs and increase the radial and circumferential area density; or, if the tab 111 is trapezoidal, the difference in the base sides combined with the offset angle can form a stepped distribution. When θ = 15°, the upper base side points towards the winding center, and the lower base side extends circumferentially, reducing the obstruction of adjacent tabs; or, if the tab 111 is parallelogram-shaped, when θ = 30°, the tabs are arranged more closely, and the gap between adjacent tabs 111 is minimized.

[0051] In one embodiment, optionally, the length of the tab 111 is L, and the radius of the core 120 is R1, satisfying: R1≤L≤2R1, that is, the length L of the tab 111 along the first direction X is greater than or equal to the radius R1 of the core 120. The tab 111 needs to be led out from the core 120 and connected to the external circuit to ensure reliable electrical contact and avoid the inability to effectively cover the radial range of the core 120, affecting the stability of the electrical connection. Furthermore, the length L of the tab 111 is less than or equal to 2R1 to avoid excessive length leading to bending, folding, or mechanical stress concentration, preventing assembly space conflicts or material waste, reducing production efficiency, and thus balancing assembly requirements and space constraints. For example, the length L of the tab 111 is 15mm, and the radius R1 of the core 120 can be any value between 15mm and 30mm. For example, the radius R1 of the core 120 is 21mm, 25mm, 28mm, or 30mm, which will not be elaborated further here.

[0052] Optionally, the radius of the central hole 121 is R2, and the width of the tab 111 is D, satisfying: R2≤D, that is, the radius R2 of the central hole 121 is less than or equal to the width D of the tab 111. This avoids the tab 111 being unable to cover the area of ​​the central hole 121 when its width is too small, provides sufficient contact area to prevent increased resistance or heat generation, avoids misalignment or detachment during battery assembly, and ensures that the tab 111 meets the welding requirements.

[0053] An embodiment of this utility model also provides a battery, which includes the multi-tab cell structure 100 described in the above embodiment. The battery including the multi-tab cell structure 100 has all the beneficial effects of the multi-tab cell structure 100, which will not be described in detail here.

[0054] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0055] The embodiments described above are merely examples of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these modifications and improvements all fall within the protection scope of this utility model.

Claims

1. A multi-pole battery cell structure, characterized in that, include: First electrode plate; The second electrode has the opposite polarity to the first electrode and has a plurality of tabs spaced apart along its length. Each tab includes an insulating region and an empty foil region. The insulating region is located close to the second electrode and the empty foil region is located at the end of the insulating region away from the second electrode. A diaphragm is abutted between the first electrode and the second electrode; the first electrode, the second electrode, and the diaphragm are wound together to form a core, each of the tabs extends toward the same end of the core, a plurality of tabs are clustered together, and the empty foil areas of the plurality of tabs are welded together. A connector that abuts against the tab and is parallel to the axis of the core.

2. The multi-pole battery cell structure according to claim 1, characterized in that, The empty foil areas of multiple electrode tabs are welded together at a welding point to form an electrode tab body. The electrode tab body has a conical structure, and the axis of the electrode tab body is not collinear with the axis of the core body.

3. The multi-pole battery cell structure according to claim 2, characterized in that, A central hole is provided at the center of the core body, and the connector is located on the axis of the tab body away from the central hole.

4. The multi-pole battery cell structure according to claim 1, characterized in that, The plurality of tabs on the core are arranged linearly along the radial direction of the core.

5. The multi-pole battery cell structure according to claim 1, characterized in that, The adjacent tabs on the core have an offset angle θ along the radial direction of the core, satisfying 0≤θ≤30°.

6. The multi-pole battery cell structure according to claim 1, characterized in that, The insulating area is provided with a chamfered portion, which is located close to the second electrode plate.

7. The multi-pole battery cell structure according to any one of claims 1 to 6, characterized in that, The shape of the electrode is one of rectangle, trapezoid or parallelogram.

8. The multi-pole battery cell structure according to claim 7, characterized in that, The length of the tab is L, and the radius of the core is R1, satisfying: R1≤L≤2R1.

9. The multi-pole battery cell structure according to claim 3, characterized in that, The radius of the central hole is R2, and the width of the tab is D, satisfying: R2≤D.

10. A battery, characterized in that, Includes the multi-pole battery cell structure as described in any one of claims 1 to 9.

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