Pole pack and battery

Abstract

The application relates to the technical field of battery structure, and discloses a pole group and a battery. The pole group comprises a pole group body, one side of which forms a second edge part; a pole lug, part of the edge of the pole lug forms a third edge part, and the third edge part is connected with the second edge part; the pole lug further comprises two first edge parts, one end of the two first edge parts is connected with the third edge part; at least part of the first edge part forms an arc-shaped section, and the arc-shaped sections of the two first edge parts are oppositely arranged; the pole group and the battery provided by the application improve the folding resistance and the structural strength of the pole lug by arranging the pole lug with the first edge part, so that the pole lug is prevented from being folded in the battery assembling and running process; the first edge part can further increase the contact area of the pole lug and an external circuit, thereby effectively reducing the ohmic impedance and improving the battery performance.

Description

Technical Field

[0001] This invention relates to the field of battery structure technology, specifically to an electrode assembly and a battery. Background Technology

[0002] An electrode assembly refers to the basic functional unit inside a battery, which is composed of key components such as positive electrode plates, negative electrode plates, and tabs. Its performance directly affects the overall efficiency of the battery.

[0003] In related technologies, the tabs are prone to folding during battery assembly and operation. When the tabs fold, they come into contact with the separator or other components, which can cause short circuits or internal faults, affecting battery safety. In addition, the high ohmic impedance between the tabs and the external circuit increases the battery's internal resistance, reduces charging and discharging efficiency, and affects battery performance. Summary of the Invention

[0004] In view of this, the present invention provides an electrode assembly and a battery to solve the problems of easy buckling of the electrode tabs and high impedance between the electrode tabs and the external circuit in the prior art.

[0005] In a first aspect, the present invention provides an electrode assembly and a battery, comprising: an electrode assembly body having a second side portion formed on one side; an electrode tab having a third side portion formed on a portion of its edge, the third side portion being connected to the second side portion; the electrode tab further comprising a first side portion having two sides, one end of the two first side portions being connected to the third side portion; at least a portion of the first side portion forming an arcuate segment, and the two arcuate segments of the first side portion being disposed opposite to each other.

[0006] Beneficial effects: By setting a tab with a first side that is connected to the edge of the electrode assembly body, the tab's resistance to bending and structural strength are improved during battery assembly and operation, preventing the tab from bending during battery assembly and operation, thereby avoiding battery short circuits or internal faults caused by tab bending and improving battery safety; the first side can also increase the contact area between the tab and the external circuit, thereby effectively reducing ohmic impedance and improving charging and discharging efficiency and battery performance.

[0007] In one alternative embodiment, the electrode assembly body has a second side portion; the electrode tab also includes a third side portion, at least one end of the first side portion is connected to the third side portion; the third side portion is connected to the second side portion.

[0008] Beneficial effects: By setting a third side at the electrode tab, and merging the third side with the second side at the electrode assembly body, the connection stability between the electrode tab and the electrode assembly body is improved; at least one end of the first side is connected to the third side, thereby making the first side and the second side continuous, improving the bending resistance of the electrode tab.

[0009] In one optional embodiment, both ends of the first side are connected to the third side, and the first side and the third side together form the tab.

[0010] Beneficial effects: The first side is an arc-shaped edge, and the two ends of the first side are smoothly connected to the two ends of the third side. The first side and the third side together form an arc-shaped electrode tab, which changes the shape of the traditional electrode tab. The arc-shaped edge improves the bending resistance and structural strength of the electrode tab, ensuring that it is not easily bent during battery assembly and operation. In addition, the arc-shaped electrode tab can better fit the internal structure of the battery and reduce space waste.

[0011] In one alternative embodiment, the second edge is formed on one side of the pole assembly body along the width direction; along the width direction, the width of the pole assembly body is W; along the length direction, the length of the tab is L1, satisfying (0.05×W)≤L1≤(0.45×W).

[0012] Beneficial effects: The relationship between the width W of the electrode assembly and the length L1 of the tab is (0.05×W)≤L1≤(0.45×W). This setting improves the internal space utilization of the battery while keeping the tab resistance within a reasonable range. If the length L1 of the tab is too small, such as L1<(0.05×W), the resistance at the tab will increase, the battery heat generation will increase, and the stability and safety of the battery will be affected. If the length L1 of the tab is too large, such as L1>(0.45×W), the tab will occupy too much space, which will limit the space for other battery components (such as the liquid injection hole above the cover plate and the explosion-proof valve), affect the battery structure design, and may even cause the tabs of the positive and negative electrodes to come into contact, leading to short circuits and other risks.

[0013] In one alternative implementation, the height of the tab along the width direction is H1, which satisfies (0.3×L1)≤H1≤(2×L1).

[0014] Beneficial effects: The relationship between the height H1 and length L1 of the tab is (0.3×L1)≤H1≤(2×L1). This setting ensures that the welding length of the tab is sufficient while guaranteeing stable battery operation. If the height H1 of the tab is too small, such as H1<(0.3×L1), the welding length of the tab will be insufficient, affecting the welding strength of the tab and thus reducing the reliability of the battery. If the height H1 of the tab is too large, such as H1>(2×L1), it will lead to unnecessary waste of tab materials such as foil. This ensures the stability of the tab during battery assembly and operation and avoids the risk of breakage due to excessive tab length.

[0015] In one optional embodiment, the electrode tab further includes a fourth side portion; the first side portion has two sides, which are arranged at intervals relative to each other; the third side portion connects the first ends of the two first sides located on the same side, and the fourth side portion connects the second ends of the two first sides located on the same side; the first side portion, the third side portion, and the fourth side portion together form the electrode tab.

[0016] Beneficial effects: The two first sides are spaced apart and protrude away from the electrode assembly body; the third side connects the first ends of the two first sides on the first side in the width direction, and the fourth side connects the second ends of the two first sides on the second side in the width direction, thereby forming an integral trapezoidal electrode tab between the first, third and fourth sides. Therefore, during battery assembly and operation, the trapezoidal electrode tab has higher folding resistance than ordinary electrode tabs, preventing the electrode tab from folding. In addition, the trapezoidal electrode tab can increase the contact area between the electrode tab and the external circuit, thereby effectively reducing ohmic impedance and improving conductivity.

[0017] In one alternative embodiment, along the length direction, the length of the electrode at one end of the fourth side is L2, and the length of the electrode at one end of the third side is L3, where L3 > L2 and satisfies 0 < L2 ≤ (0.8 × L3).

[0018] Beneficial effect: The relationship between the length L2 of the tab at the fourth side and the length L3 of the tab at the third side satisfies 0 < L2 ≤ (0.8 × L3) to ensure that the welding length of the tab is sufficient. If the value of length L2 is too large, such as length L2 > (0.8 × L3), it will lead to insufficient welding length of the tab, affecting the welding strength of the tab and thus reducing the reliability of the battery.

[0019] In one alternative implementation, the distance between the fourth side and the second side along the width direction is H2, which satisfies (0.3×L3)≤H2≤(2×L3).

[0020] Beneficial effects: The relationship between the distance H2 between the fourth side and the second side and the length L3 of the tab at one end of the third side satisfies (0.3×L3)≤H2≤(2×L3). This setting ensures that the welding length of the trapezoidal tab is sufficient while guaranteeing stable battery operation. If the value of the distance H2 between the fourth side and the second side is too small, such as H2<(0.3×L3), it will lead to insufficient welding length of the tab, affecting the welding strength of the tab and thus reducing the reliability of the battery. If the value of the distance H2 between the fourth side and the second side is too large, such as H2>(2×L3), it will lead to unnecessary waste of tab material such as foil. This ensures the stability of the tab during battery assembly and operation and avoids the risk of breakage due to excessive tab length.

[0021] In a second aspect, the present invention also provides a battery comprising the electrode assembly as described in any of the preceding claims. Attached Figure Description

[0022] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the electrode assembly of the present invention;

[0024] Figure 2 For the present invention Figure 1 Top view of the pole group shown;

[0025] Figure 3 This is a schematic diagram of the pole assembly according to another embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of an electrode assembly according to another embodiment of the present invention;

[0027] Figure 5 The present invention relates to a conventional battery and having Figure 2 A comparison chart of voltage parameters for the tab batteries shown;

[0028] Figure 6 This is a schematic diagram of the electrode assembly with conventional tabs according to the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Electrode body; 11. Second side; 2. Electrode tab; 21. First side; 22. Third side; 23. Fourth side; 3. Positive electrode plate; 4. Negative electrode plate; 5. Diaphragm. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, 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. They are used only for the convenience of describing this invention and for 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 invention according to the specific circumstances.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0036] According to an embodiment of the present invention, in one aspect, an electrode assembly is provided, comprising: an electrode assembly body 1, on one side forming a second side portion 11; an electrode tab 2, a portion of the edge of the electrode tab 2 forming a third side portion 22, the third side portion 22 being connected to the second side portion 11; the electrode tab 2 further comprising a first side portion 21, the first side portion 21 having two sides, the ends of the two first side portions 21 being respectively connected to the third side portion 22; at least a portion of the first side portion 21 forming an arcuate segment, and the arcuate segments of the two first side portions 21 being disposed opposite to each other.

[0037] It should be noted that at least a portion of the first side 21 forms an arc segment. Specifically, the first side 21 can be a continuous arc segment, or a portion of the first side 21 can be set as an arc.

[0038] For details, please refer to Figure 6Traditional tabs are rectangular in shape. During battery assembly and operation, the four sides of a rectangular tab are straight, making it prone to folding and tearing. This embodiment provides a tab 2, which is connected to one side of the electrode assembly body 1. The tab 2 has a first side 21, which is an arc-shaped edge. Compared with traditional tabs, when the first side 21 is subjected to external force, the stress can be evenly distributed along the arc trajectory through the arc-shaped edge, avoiding stress concentration in a certain place due to the inability of the straight rectangular edge to distribute stress. In addition, the first side 21 has two sides, and the two first sides 21 are respectively bulging outward in a direction away from each other, forming a symmetrical outward arc-shaped structure, which improves the fold resistance (resistance to bending) and structural strength of the tab 2, thus making it less prone to folding during battery assembly and operation.

[0039] Furthermore, the two first sides 21 are respectively arranged to protrude outward in a direction that is far away from each other. Compared with the traditional rectangular tabs, the outward protrusion of the first side 21 increases the contact area between the tab 2 and the external circuit, thereby effectively reducing ohmic impedance, improving conductivity, and reducing energy loss.

[0040] In this embodiment, by providing a tab 2 with a first side 21, and the first side 21 being connected to the edge of the electrode assembly body 1, the first side 21 being an arc-shaped edge, with the two first sides 21 protruding in directions away from each other, the tab 2's resistance to bending and structural strength are improved during battery assembly and operation, preventing the tab 2 from folding during battery assembly and operation, thereby avoiding battery short circuits or internal faults caused by the tab 2 folding, and improving battery safety; the first side 21 can also increase the contact area between the tab 2 and the external circuit, thereby effectively reducing ohmic impedance, improving charging and discharging efficiency and battery performance, especially in high-rate charging and discharging or high-current application scenarios, ensuring that the battery can work efficiently and stably.

[0041] In some embodiments, combined with Figure 2 As shown, the pole assembly body 1 has a second side portion 11; the pole tab 2 also includes a third side portion 22, at least one end of the first side portion 21 is connected to the third side portion 22; the third side portion 22 is connected to the second side portion 11.

[0042] Specifically, the second side 11 is formed on one side of the electrode assembly body 1 along the width direction, the third side 22 overlaps and connects with the second side plate, and at least one end of the first side 21 is connected to the third side 22, thereby making the first side 21 and the second side 11 continuously connected, so that the connection between the tab 2 and the electrode assembly body 1 is stable, improving the bending resistance and structural strength of the tab 2, and preventing the tab 2 from folding during battery assembly and operation.

[0043] In this embodiment, by providing a third side portion 22 at the electrode tab 2, and having the third side portion 22 overlap and connect with the second side portion 11 at the electrode assembly body 1, the connection stability between the electrode tab 2 and the electrode assembly body 1 is improved; at least one end of the first side portion 21 is connected to the third side portion 22, thereby making the first side portion 21 and the second side portion 11 continuously connected, thus improving the bending resistance of the electrode tab 2.

[0044] In some embodiments, combined with Figure 2 As shown, the first ends of the two first sides 21 are connected, and the second ends are respectively connected to the third side 22, so that the first side 21 and the third side 22 enclose each other to form the tab 2.

[0045] Specifically, two first sides 21 are symmetrically arranged, with the first ends of the two first sides 21 connected together and the second end connected to the third side; the first side 21 is an arc-shaped edge, and its two ends are smoothly connected to the two ends of the third side 22 respectively. The first side 21 and the third side 22 enclose each other to form an electrode tab 2 with an overall arc-shaped structure, which changes the shape of the traditional electrode tab and uses the arc-shaped edge to improve the bending resistance and structural strength of the electrode tab 2, ensuring that it is not easily bent during battery assembly and operation.

[0046] It should be noted that traditional right-angle tabs have poor compatibility with the internal structure of the battery, affecting the battery's energy density. By setting the first side 21 as an arc-shaped side, the arc-shaped tab can better fit the internal structure of the battery, reduce space waste, improve battery energy density, and enable the battery to have higher performance and longer range in the same volume.

[0047] Optionally, the first side 21 can be, but is not limited to, a circular arc, an elliptical arc, or a parabolic arc, and the specific shape can be adjusted according to the actual application requirements.

[0048] In this embodiment, the first side is an arc-shaped side, and the two ends of the first side 21 are smoothly connected to the two ends of the third side 22. The first side 21 and the third side 22 enclose each other to form an electrode tab 2 with an overall arc-shaped structure. This changes the shape of the traditional electrode tab and improves the bending resistance and structural strength of the electrode tab 2 by using the arc-shaped side, ensuring that it is not easily bent during battery assembly and operation. In addition, the arc-shaped electrode tab can better fit the internal structure of the battery and reduce space waste.

[0049] In some embodiments, combined with Figure 2 As shown, the second side 11 is formed on one side of the pole body 1 along the width direction; along the width direction, the width of the pole body 1 is W; along the length direction, the length of the pole tab 2 is L1, satisfying (0.05×W)≤L1≤(0.45×W).

[0050] In this embodiment, the relationship between the width W of the electrode body 1 and the length L1 of the tab 2 is (0.05×W)≤L1≤(0.45×W). This setting improves the space utilization rate inside the battery while keeping the resistance of the tab 2 within a reasonable range.

[0051] It is worth noting that if the length L1 of tab 2 is too small, such as L1 < (0.05 × W), the resistance at tab 2 will increase, the battery heat generation will increase, and the stability and safety of the battery will be affected. If the length L1 of tab 2 is too large, such as L1 > (0.45 × W), tab 2 will occupy too much space, which will limit the space for other battery components (such as the liquid injection hole above the cover and the explosion-proof valve), affect the battery structure design, and may even cause the tabs of the positive and negative terminals to come into contact, leading to short circuits and other risks.

[0052] In some embodiments, combined with Figure 2 As shown, along the width direction, the height of the tab 2 is H1, which satisfies (0.3×L1)≤H1≤(2×L1).

[0053] In this embodiment, the relationship between the height H1 and the length L1 of the tab 2 is (0.3×L1)≤H1≤(2×L1). This setting ensures that the welding length of the tab 2 is sufficient while guaranteeing stable battery operation.

[0054] It is worth noting that if the height H1 of tab 2 is too small, such as H1 < (0.3 × L1), the welding length of tab 2 will be insufficient, affecting the welding strength of tab 2 and thus reducing the reliability of the battery. If the height H1 of tab 2 is too large, such as H1 > (2 × L1), it will lead to unnecessary waste of materials such as foil for tab 2. To ensure the stability of tab 2 in battery assembly and operation, the risk of breakage caused by excessive length of tab 2 should be avoided.

[0055] In some embodiments, combined with Figure 3 As shown, the electrode tab 2 also includes a fourth side portion 23; the first side portion 21 has two sides, which are arranged at intervals relative to each other; the third side portion 22 connects the first ends of the two first sides 21 located on the first side in the width direction, and the fourth side portion 23 connects the second ends of the two first sides 21 located on the second side in the width direction, wherein the first side and the second side are arranged opposite to each other; the first side portion 21, the third side portion 22 and the fourth side portion 23 together form the electrode tab 2.

[0056] Specifically, two first sides 21 are spaced apart and protrude away from the electrode assembly body 1 respectively; a third side 22 connects the first ends of the two first sides 21 on the same side, and a fourth side 23 connects the second ends of the two first sides 21 on the same side, thereby forming an integral trapezoidal electrode tab between the first side 21, the third side 22 and the fourth side 23. Therefore, during battery assembly and operation, the trapezoidal electrode tab has higher folding resistance than ordinary electrode tabs, preventing the electrode tab 2 from folding. In addition, the trapezoidal electrode tab can increase the contact area between the electrode tab 2 and the external circuit, thereby effectively reducing ohmic impedance and improving conductivity.

[0057] In some embodiments, combined with Figure 3 As shown, the first side 21 located on both sides of the trapezoidal tab along the length direction is an arc-shaped side. The two arc-shaped sides of the trapezoidal tab can be symmetrical or asymmetrical, which improves the bending resistance of the tab 2 and the contact area with the external circuit.

[0058] In some embodiments, combined with Figure 3 As shown, along the length direction, the length of the tab 2 at the fourth side 23 is L2, and the length of the tab 2 at the third side 22 is L3, L3 > L2, and satisfies 0 < L2 ≤ (0.8 × L3).

[0059] In this embodiment, the relationship between the length L2 of the tab 2 at the fourth side 23 and the length L3 of the tab 2 at the third side 22 satisfies 0 < L2 ≤ (0.8 × L3) to ensure that the welding length of the tab 2 is sufficient.

[0060] It is worth noting that if the length L2 is too large, such as length L2 > (0.8 × L3), the welding length of tab 2 will be insufficient, affecting the welding strength of tab 2 and thus reducing the reliability of the battery.

[0061] In some embodiments, combined with Figure 3 As shown, along the width direction, the distance between the fourth side 23 and the second side 11 is H2, which satisfies (0.3×L3)≤H2≤(2×L3).

[0062] In this embodiment, the distance H2 between the fourth side 23 and the second side 11 and the length L3 of the tab 2 near the third side 22 are related by (0.3×L3)≤H2≤(2×L3). This setting ensures that the welding length of the trapezoidal tab is sufficient while ensuring stable battery operation.

[0063] It is worth noting that if the distance H2 between the fourth side 23 and the second side 11 is too small, such as H2 < (0.3 × L3), the welding length of the tab 2 will be insufficient, affecting the welding strength of the tab 2 and thus reducing the reliability of the battery. If the distance H2 between the fourth side 23 and the second side 11 is too large, such as H2 > (2 × L3), it will lead to unnecessary waste of materials such as foil for the tab 2. This will ensure the stability of the tab 2 during battery assembly and operation and avoid the risk of breakage due to the tab 2 being too long.

[0064] In some embodiments, combined with Figure 1 As shown, the electrode group also includes a positive electrode 3 and a negative electrode 4. Multiple tabs 2 are provided, namely positive tabs and negative tabs. The positive tabs are connected to the positive electrode 3, and the negative tabs are connected to the negative electrode 4. The tabs 2 are all located on the same side of the electrode group. The electrode group also includes a diaphragm 5. The positive electrode 3 and the negative electrode 4 are stacked, and the diaphragm 5 is sandwiched between the positive and negative electrodes.

[0065] In some embodiments, combined with Figure 1 As shown, the width W of the pole body 1 ranges from 100mm ≤ W ≤ 200mm.

[0066] In this embodiment, the width W of the electrode assembly body 1 is in the range of 100mm≤W≤200mm. This setting ensures that the battery capacity is sufficient while ensuring that the battery packaging efficiency is not affected.

[0067] It is worth noting that if the width W is too small, it will affect the battery capacity and thus the battery's performance; if the width W is too large, it will increase the packaging difficulty and affect the battery's packaging efficiency.

[0068] In some embodiments, combined with Figure 1 As shown, the length of the pole body 1 is L4, which satisfies 300mm≤L4≤600mm.

[0069] In this embodiment, the length L4 of the electrode assembly body 1 is in the range of 300mm≤L4≤600mm. This setting ensures that the battery capacity is sufficient while ensuring that the battery packaging efficiency is not affected.

[0070] It is worth noting that if the length L4 is too small, it will affect the battery capacity and thus the battery's performance; if the length L4 is too large, it will increase the packaging difficulty and affect the battery's packaging efficiency.

[0071] Optionally, the two tabs 2 can be symmetrical or asymmetrical to accommodate the needs of different winding and stacking processes.

[0072] According to an embodiment of the present invention, in another aspect, a battery is also provided, comprising the electrode assembly as described in any of the preceding claims.

[0073] For those with Figure 6 The conventional battery with square tabs 2 shown, and the battery with... Figure 2 A comparative test was conducted on the battery with the arc-shaped tab 2 shown, ensuring that the charging current of both batteries remained consistent. Specifically, the charging current could be 1C, where 1C means that the charging current is equal to the nominal capacity of the battery. The full battery voltage parameters and heat generation power parameters were calculated using electrochemical simulation software.

[0074] Figure 5 For the comparison of full-cell voltage parameters, the straight line segment represents... Figure 2 The graph shows the total voltage parameter variation over time for the battery with tab 2. The dashed line segment represents the total voltage parameter variation over time for a battery with conventional tabs. As can be seen from the graph, the battery with tab 2... Figure 2 The voltage of the battery with tab 2 shown is lower than that of a conventional battery, indicating that the polarization degree of the battery tab in this application is less than that of the conventional battery tab, thereby improving the overall performance of the battery.

[0075] Table 1. Traditional batteries and their features Figure 2 Comparison of heat generation power of batteries with tabs shown

[0076]

[0077] As shown in Table 1, under the same copper electrode conditions, the heat generation power of a conventional battery is 1.8666 × 10⁻⁶. 5 W / m 3 ,have Figure 2 The heat generation power of the battery with tab 2 shown is 29166W / m. 3 This is lower than the heat generation power of traditional batteries; under the same aluminum material, the heat generation power of traditional batteries is 33059W / m. 3 ,have Figure 2 The heat generation power of the battery with tab 2 shown is 7791.8 W / m. 3 It has a lower heat generation capacity than traditional batteries.

[0078] Considering the different materials used for the tabs, the heat generation capacity of traditional batteries is... Figure 2 The battery heat generation power of the tab 2 shown is 1.2 to 23 times that of the battery. Therefore, the tab structure of the present invention significantly reduces the heat generation power of the battery and improves the battery life.

[0079] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and all such modifications and variations fall within the scope defined by the present invention.

Claims

1. An electrode assembly, characterized in that, include: The pole body has a second side portion formed on one side; A tab, wherein a portion of the edge of the tab forms a third side portion, and the third side portion is connected to the second side portion; The electrode also includes a first side portion, which has two sides, one end of which is connected to the third side portion. At least a portion of the first side forms an arc segment, and two arc segments of the first side are arranged opposite to each other. The first side is either a continuous arc segment or a partial line segment that is arc-shaped. The electrode also includes a fourth side portion; The third side portion connects to the first ends of the two first sides located on the first side in the width direction, and the fourth side portion connects to the second ends of the two first sides located on the second side in the width direction, so that the first side portion, the third side portion, and the fourth side portion enclose and form the electrode tab; Along the length direction, the length of the electrode at one end of the fourth side is L2, and the length of the electrode at one end of the third side is L3, where L3 > L2 and satisfies 0 < L2 ≤ (0.8 × L3). Along the width direction, the distance between the fourth side and the second side is H2, which satisfies (0.3×L3)≤H2≤(2×L3).

2. The electrode assembly according to claim 1, characterized in that, The width W of the pole group body is in the range of 100mm≤W≤200mm.

3. The electrode assembly according to claim 1 or 2, characterized in that, The length of the pole group body is L4, which satisfies 300mm≤L4≤600mm.

4. A battery, characterized in that, Includes the pole group as described in any one of claims 1-3 above.

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