Battery pole group and battery

Abstract

This invention belongs to the field of battery technology and discloses a battery electrode assembly and a battery. The battery electrode assembly includes an electrode assembly body and electrode tabs. The electrode assembly body includes a supporting boss on at least one side along a first direction, and a mounting platform on at least one side along a second direction. The mounting platform includes a first stepped surface, a second stepped surface, and a connecting surface. The first stepped surface is located between the supporting boss and the connecting surface, at the higher end of the connecting surface, and the second stepped surface is located at the lower end of the connecting surface. The electrode tabs include a first electrode tab portion and a second electrode tab portion. The first electrode tab portion is located on the first stepped surface, and the second electrode tab portion is located on the connecting surface. This design ensures that when the battery electrode assembly is installed in the casing, the thrust is applied to the supporting boss, avoiding damage to the electrode tabs. Furthermore, the supporting boss increases the overall volume of the battery electrode assembly, improving its capacity. Additionally, by using the first and second electrode tab portions to form the electrode tabs, the area of ​​the electrode tabs is effectively increased, improving current carrying capacity.

Description

Technical Field

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

[0002] With the rapid development of new energy vehicles, energy storage systems, and other fields, the market is placing increasingly higher demands on the energy density, safety, charge-discharge performance, and lifespan of power batteries. As a core component of power batteries, the structural design of the battery electrode assembly directly affects the overall performance of the battery. Within the limited space of the battery casing, how to improve energy density, enhance current conduction efficiency, and strengthen the structural stability of the electrode assembly during assembly by optimizing its structure has become one of the key research directions in the industry.

[0003] Traditional battery electrode assemblies typically employ a regular stacked or wound structure, forming a regular cuboid or cylinder. The multi-layered conductive tabs are integrated into a single unit, positioned on the same plane, and are generally directly connected to the terminal posts or connecting tabs on the battery cover using methods such as laser welding. During assembly, the thrust is often applied directly to the end face where the conductive tabs are located or the edge of the electrode assembly, relying on the structural strength of the electrode assembly itself to withstand the pressure during assembly.

[0004] However, traditional battery electrode packs have several limitations: First, traditional electrode packs typically have only one tab of the same polarity, resulting in a limited overcurrent area. This can lead to excessively high current density during high-current charging and discharging, increasing overcurrent temperature, affecting battery cycle performance, and potentially causing safety hazards due to localized overheating. Second, due to the lack of a dedicated support structure, the thrust applied when the electrode pack is installed into the casing acts directly on the tabs or the area near them. The tabs are easily deformed or broken due to compression, or the weld between the tabs and the cover plate may become faulty or detached, affecting the battery's conductivity and sealing. Third, to avoid structural interference, traditional electrode packs often need to compress their own volume, making it difficult to fully utilize the space within the battery casing and limiting further increases in battery capacity. Summary of the Invention

[0005] The purpose of this invention is to provide a battery electrode assembly and battery with a large overcurrent area, low overcurrent temperature, good protection, large size, and high capacity.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] On one hand, a battery electrode assembly is provided, the battery electrode assembly comprising:

[0008] The electrode assembly body includes a supporting boss and a mounting platform on at least one side along a first direction. The supporting boss is provided with the mounting platform on at least one side along a second direction. The mounting platform has a stepped structure and includes a first step surface, a second step surface, and a connecting surface. The first step surface is located between the supporting boss and the connecting surface. The connecting surface is located between the first step surface and the second step surface. The higher end of the connecting surface is connected to the first step surface, and the lower end of the connecting surface is connected to the second step surface.

[0009] The electrode includes a first electrode portion and a second electrode portion. The first electrode portion is disposed on the first step surface, and the second electrode portion is disposed on the connecting surface and connected to the first electrode portion. The surface of the first electrode portion facing away from the first step surface is lower than the surface of the support boss facing away from the first step surface.

[0010] Optionally, the length of the support boss along the second direction is W1, and the length of the pole assembly body along the second direction is L, satisfying 0.35≤W1 / L≤0.6.

[0011] Optionally, the length dimension of the first step surface along the second direction is W2, and the length dimension of the second step surface along the second direction is W3, and satisfies 0.19≤W3 / W2≤0.9.

[0012] Optionally, the width dimension of the first electrode tab along the first direction and the width dimension of the second electrode tab along the second direction are both E, and satisfy 4.5mm≤E≤8mm.

[0013] Optionally, the support boss includes a support plane and a connecting plane. The connecting plane is located between the support plane and the first step surface. The support plane is located at the high end of the connecting plane, and the low end of the connecting plane is connected to the first step surface. The distance between the support plane and the first step surface along the first direction is H1, and satisfies 16mm≤H1≤48mm.

[0014] Optionally, when the supporting boss has the mounting platform on only one side along the second direction, the connecting plane is inclined between the supporting plane and the first step surface;

[0015] Alternatively, when the mounting platform is provided on both sides of the support boss along the second direction, the connecting plane is vertically disposed between the support plane and the first step surface.

[0016] Optionally, the distance between the first step surface and the second step surface along the first direction is H2, and satisfies 25mm≤H2≤200mm.

[0017] On the other hand, a battery is also provided, the battery including a battery cover, a battery housing and a battery electrode assembly as described in any of the above claims, the battery housing being a hollow housing structure with at least one opening, the battery cover being disposed at the opening of the battery housing to close the battery housing and to form a receiving cavity for accommodating the battery electrode assembly.

[0018] Optionally, when the supporting boss has the mounting platform on only one side along the second direction, the battery cover includes a cover body and a terminal module. The cover body includes an expansion portion and a mounting portion. The expansion portion has a hollow cavity. The supporting boss is inserted into the expansion portion. The mounting portion is located on the side of the expansion portion near the mounting platform. The terminal module is connected to the mounting portion and connected to the electrode tab. The portion of the terminal module located outside the mounting portion is lower than the expansion portion.

[0019] Optionally, when the supporting boss is provided with mounting platforms on both sides along the second direction, the battery cover includes a cover body and a terminal module. The cover body includes an expansion portion and a mounting portion. The expansion portion has a hollow cavity. The supporting boss is inserted into the expansion portion. The expansion portion is provided with mounting portions on both sides along the second direction. Each mounting portion is connected to the terminal module, and the terminal module is connected to the tab.

[0020] The beneficial effects of this invention are:

[0021] This invention provides a battery electrode assembly with a mounting platform consisting of a supporting boss and a mounting base formed by a first stepped surface, a second stepped surface, and a connecting surface. By connecting the first stepped surface, located between the supporting boss and the connecting surface, to the higher end of the connecting surface, and connecting the second stepped surface to the lower end of the connecting surface, the heights of the second stepped surface, the first stepped surface, and the supporting boss increase sequentially. On the one hand, this allows the thrust to be applied to the supporting boss when the battery electrode assembly is installed in the casing, avoiding direct force on the tabs and providing good protection for the tabs, reducing the occurrence of problems such as tab deformation and breakage. On the other hand, the supporting boss increases the overall volume of the battery electrode assembly, improving its capacity. Furthermore, by forming the tabs with a first tab portion and a second tab portion, the current-carrying area of ​​the tabs is effectively increased, and the temperature during the current-carrying process is reduced, improving the charging and discharging performance and safety of the battery.

[0022] The present invention also provides a battery that, by applying the above-described battery electrode assembly, not only reduces the risk of safety problems caused by overheating, but also increases the battery capacity, meets the demand for improved battery energy density, and has a longer battery life or longer power supply time. Attached Figure Description

[0023] Figure 1 This is a partial three-dimensional structural schematic diagram of the battery electrode assembly provided in Embodiment 1 of the present invention;

[0024] Figure 2 This is a partial planar structural schematic diagram of the battery electrode assembly provided in Embodiment 1 of the present invention;

[0025] Figure 3 This is a partial three-dimensional structural diagram of the battery provided in Embodiment 1 of the present invention;

[0026] Figure 4 This is a partial three-dimensional structural diagram of the battery electrode assembly provided in Embodiment 2 of the present invention;

[0027] Figure 5 This is a partial planar structural schematic diagram of the battery electrode assembly provided in Embodiment 2 of the present invention;

[0028] Figure 6 This is a partial three-dimensional structural diagram of the battery provided in Embodiment 2 of the present invention.

[0029] In the picture:

[0030] 100. Battery cover; 101. Cover body; 1011. Capacity expansion section; 1012. Mounting section; 102. Terminal post module; 200. Battery casing;

[0031] 1. Pole assembly body; 11. Support boss; 111. Support plane; 112. Connecting plane; 12. Mounting platform; 121. First step surface; 122. Second step surface; 123. Connecting surface;

[0032] 2. Electrode; 21. First electrode portion; 22. Second electrode portion. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0037] Traditional battery electrode packs have several limitations: First, they typically have only one tab of the same polarity, resulting in a limited overcurrent area. This can lead to excessively high current density during high-current charging and discharging, increasing overcurrent temperature, affecting battery cycle performance, and potentially causing safety hazards due to localized overheating. Second, due to the lack of a dedicated support structure, the thrust applied when the battery pack is installed directly acts on the tab or the area near it. This can cause the tab to deform or break under pressure, or result in incomplete or detached welding at the connection between the tab and the cover plate, affecting the battery's conductivity and sealing. Third, to avoid structural interference, traditional electrode packs often need to compress their own volume, making it difficult to fully utilize the space within the battery casing and limiting further increases in battery capacity.

[0038] Therefore, in order to increase the current-carrying area of ​​the battery electrode assembly, reduce the current-carrying temperature, improve the protection of the tabs, increase the volume of the electrode assembly, and increase the capacity, this embodiment provides a battery electrode assembly. For ease of description, the length direction of the battery electrode assembly is defined as the first direction, and the width direction of the battery electrode assembly is defined as the second direction.

[0039] Example 1

[0040] like Figures 1 to 2As shown, the battery electrode assembly includes an electrode assembly body 1 and electrode tabs 2. The electrode assembly body 1 includes a supporting boss 11 and a mounting platform 12 on at least one side along a first direction. The supporting boss 11 has a mounting platform 12 on one side along a second direction. The mounting platform 12 has a stepped structure and includes a first step surface 121, a second step surface 122, and a connecting surface 123. The first step surface 121 is located between the supporting boss 11 and the connecting surface 123, and the connecting surface 123 is located between the first step surface 121 and the second step surface 122. Between surfaces 122, the high end of the connecting surface 123 is connected to the first step surface 121, and the low end of the connecting surface 123 is connected to the second step surface 122. The electrode ear 2 includes a first electrode ear portion 21 and a second electrode ear portion 22. The first electrode ear portion 21 is disposed on the first step surface 121, and the second electrode ear portion 22 is disposed on the connecting surface 123 and is connected to the first electrode ear portion 21. The surface of the first electrode ear portion 21 facing away from the first step surface 121 is lower than the surface of the supporting boss 11 facing away from the first step surface 121.

[0041] The mounting platform 12 is composed of a support boss 11 and a first stepped surface 121, a second stepped surface 122, and a connecting surface 123. By connecting the first stepped surface 121, located between the support boss 11 and the connecting surface 123, to the high end of the connecting surface 123, and connecting the second stepped surface 122 to the low end of the connecting surface 123, the heights of the second stepped surface 122, the first stepped surface 121, and the support boss 11 increase sequentially. On the one hand, when the battery electrode assembly is installed in the casing, the thrust can be applied to the support boss 11, avoiding direct force on the tab 2 and providing good protection for the tab 2, reducing the occurrence of problems such as deformation and breakage of the tab 2. On the other hand, the support boss 11 increases the overall volume of the battery electrode assembly, thereby increasing the capacity. In addition, by forming the tab 2 with the first tab portion 21 and the second tab portion 22, the current-passing area of ​​the tab 2 is effectively increased, and the temperature during the current-passing process is reduced, thereby improving the charging and discharging performance and safety of the battery.

[0042] Optionally, such as Figures 1 to 2 As shown, the length of the support boss 11 along the second direction is W1, and the length of the pole body 1 along the second direction is L, and the condition 0.35≤W1 / L≤0.6 is met.

[0043] By limiting the ratio of the length W1 of the support boss 11 along the second direction to the length L of the electrode assembly body 1 along the second direction, such that 0.35≤W1 / L≤0.6, we can avoid the following: on the one hand, the length of the support boss 11 along the second direction is too small, resulting in insufficient volume for the expansion of the electrode assembly body 1 and insufficient capacity to meet the power supply requirements of the battery electrode assembly; on the other hand, we can avoid the following: the length of the support boss 11 along the second direction is too large, resulting in compression of the size of the mounting platform 12 and insufficient area on the mounting platform 12 for setting the tabs 2, thus failing to meet the overcurrent requirements of the battery electrode assembly.

[0044] The ratio of the length W1 of the support boss 11 along the second direction to the length L of the pole body 1 along the second direction can be any value between 0.35 and 0.6 or any range between two values, such as 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, etc.

[0045] Optionally, such as Figures 1 to 2 As shown, the length dimension of the first step surface 121 along the second direction is W2, and the length dimension of the second step surface 122 along the second direction is W3, and satisfies 0.19≤W3 / W2≤0.9.

[0046] By limiting the ratio between the length W3 of the second step surface 122 along the second direction and the length W2 of the first step surface 121 along the second direction, such that 0.19≤W3 / W2≤0.9, the following measures are taken: Firstly, the length of the second step surface 122 along the second direction is not too small, which would cause the second electrode ear 22 connected to the connecting surface 123 to be too close to the edge of the battery electrode assembly, making it easy to be damaged during the transfer of the battery electrode assembly. Secondly, the length of the second step surface 122 along the second direction is not too large, which would cause the gap above the second step surface 122 to be too large, resulting in a reduction in the volume and capacity of the electrode assembly body 1, thus failing to meet the energy supply requirements of the battery.

[0047] The ratio between the length dimension W3 of the second step surface 122 along the second direction and the length dimension W2 of the first step surface 121 along the second direction can be any value between 0.19 and 0.9 or any range between two values, such as 0.19, 0.332, 0.474, 0.616, 0.758, 0.9, etc.

[0048] Optionally, such as Figures 1 to 2 As shown, the width dimension of the first electrode ear 21 along the first direction and the width dimension of the second electrode ear 22 along the second direction are both E, and satisfy 4.5mm≤E≤8mm.

[0049] By limiting the width of the first tab 21 along the first direction and the width E of the second tab 22 along the second direction to satisfy 4.5mm≤E≤8mm, it is possible to avoid the first tab 21 and the second tab 22 being too narrow and failing to meet the overcurrent requirements of the battery electrode assembly, and to avoid the first tab 21 and the second tab 22 being too wide, which would make the tabs 2 easily damaged during the transfer of the battery electrode assembly.

[0050] The width dimension E of the first electrode ear 21 along the first direction and the width dimension E of the second electrode ear 22 along the second direction can be any value between 4.5mm and 8mm or any range between two values, such as 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0051] In this embodiment, to verify the impact of the above parameter limitations on the battery electrode assembly provided in this embodiment, as shown in Table 1, six sets of embodiments and six sets of comparative examples are provided for verification.

[0052] Table 1

[0053]

[0054] A comparison of Examples 1 to 6 with Comparative Examples 1 to 2 reveals that when the ratio of the length W1 of the support boss 11 along the second direction to the length L of the electrode assembly body 1 along the second direction is less than the minimum value in the range 0.35 ≤ W1 / L ≤ 0.6, the length of the support boss 11 along the second direction is too small, resulting in insufficient volume of the support boss 11 for expanding the electrode assembly body 1, and the capacity is too small to meet the power supply requirements of the battery electrode assembly. When the ratio of the length W1 of the support boss 11 along the second direction to the length L of the electrode assembly body 1 along the second direction is greater than the maximum value in the range 0.35 ≤ W1 / L ≤ 0.6, the length of the support boss 11 along the second direction is too large, resulting in compression of the size of the mounting platform 12, which makes the area on the mounting platform 12 for setting the tabs 2 insufficient and fails to meet the overcurrent requirements of the battery electrode assembly.

[0055] A comparison of Examples 1 to 6 with Comparative Examples 3 to 4 reveals that when the ratio between the length W3 of the second step surface 122 along the second direction and the length W2 of the first step surface 121 along the second direction is less than the minimum value in the range 0.19 ≤ W3 / W2 ≤ 0.9, the length of the second step surface 122 along the second direction is too small, causing the second electrode ear 22 connected to the connecting surface 123 to be too close to the edge of the battery electrode assembly, which is prone to damage during the transfer of the battery electrode assembly. When the ratio between the length W3 of the second step surface 122 along the second direction and the length W2 of the first step surface 121 along the second direction is greater than the maximum value in the range 0.19 ≤ W3 / W2 ≤ 0.9, the length of the second step surface 122 along the second direction is too large, causing the gap above the second step surface 122 to be too large, resulting in a reduction in the volume and capacity of the electrode assembly body 1, which does not meet the energy supply requirements of the battery.

[0056] A comparison of Examples 1 to 6 with Comparative Examples 5 to 6 reveals that when the width of the first tab 21 along the first direction and the width E of the second tab 22 along the second direction are less than the minimum value of the range 4.5mm≤E≤8mm, the width of the first tab 21 and the second tab 22 is insufficient and does not meet the overcurrent requirements of the battery electrode assembly. When the width of the first tab 21 along the first direction and the width E of the second tab 22 along the second direction are greater than the maximum value of the range 4.5mm≤E≤8mm, the width of the first tab 21 and the second tab 22 is too large, causing the tab 2 to be easily damaged during the transfer of the battery electrode assembly.

[0057] Optionally, such as Figures 1 to 2 As shown, the support boss 11 includes a support plane 111 and a connecting plane 112. The connecting plane 112 is located between the support plane 111 and the first step surface 121. The support plane 111 is located at the high end of the connecting plane 112, and the low end of the connecting plane 112 is connected to the first step surface 121. The distance between the support plane 111 and the first step surface 121 along the first direction is H1, and satisfies 16mm≤H1≤48mm.

[0058] By limiting the distance H1 between the support plane 111 and the first step surface 121 along the first direction to satisfy 16mm≤H1≤48mm, this avoids two problems: firstly, the distance is too small, which would result in a small height difference between the support plane 111 and the first step surface 121, causing the first electrode ear 21 to be too close to the support plane 111 and easily damaged; secondly, the distance is too large, which would result in an excessively large gap above the first step surface 121, reducing the volume and capacity of the electrode assembly body 1 and failing to meet the power supply requirements of the battery.

[0059] The distance H1 between the support plane 111 and the first step surface 121 along the first direction can be any value between 16mm and 48mm or any range between two values, such as 16mm, 20mm, 24mm, 28mm, 32mm, 36mm, 40mm, 44mm, 48mm, etc.

[0060] Optionally, such as Figures 1 to 2 As shown, when the support boss 11 has an installation platform 12 on only one side along the second direction, the connecting plane 112 is inclined between the support plane 111 and the first step surface 121.

[0061] By tilting the connecting plane 112 between the supporting plane 111 and the first step surface 121, the connecting plane 112 and the supporting plane 111 cooperate with each other, increasing the contact area between the supporting boss 11 and the battery cover plate 100, and improving the stability of the support.

[0062] Optionally, such as Figures 1 to 2 As shown, the distance between the first step surface 121 and the second step surface 122 along the first direction is H2, and satisfies 25mm≤H2≤200mm.

[0063] By limiting the distance H2 between the first step surface 121 and the second step surface 122 along the first direction to satisfy 25mm≤H2≤200mm, this avoids two problems: firstly, the height difference between the first step surface 121 and the second step surface 122 is too small, resulting in insufficient size of the connecting surface 123 used to set the second electrode 22, reducing the current-passing area of ​​the electrode 2 and failing to meet the current-passing requirements; secondly, it avoids the height difference between the first step surface 121 and the second step surface 122 being too large, resulting in an excessively large gap above the second step surface 122, which reduces the volume and capacity of the electrode assembly body 1 and fails to meet the power supply requirements of the battery.

[0064] The distance H2 between the first step surface 121 and the second step surface 122 along the first direction can be any value between 25mm and 200mm or any range between any two values, such as 25mm, 50mm, 75mm, 100mm, 125mm, 150mm, 175mm, 200mm, etc.

[0065] In this embodiment, to verify the impact of the above parameter limitations on the battery electrode assembly provided in this embodiment, as shown in Table 2, six sets of embodiments and four sets of comparative examples are provided for verification.

[0066] Table 2

[0067]

[0068] A comparison of Examples 7 to 12 with Comparative Examples 7 to 8 reveals that when the distance H1 between the supporting plane 111 and the first step surface 121 along the first direction is less than the minimum value of 16mm ≤ H1 ≤ 48mm, the distance is too small, resulting in a small height difference between the supporting plane 111 and the first step surface 121. This causes the first electrode ear 21 to be too close to the supporting plane 111, making it prone to damage. When the distance H1 between the supporting plane 111 and the first step surface 121 along the first direction is greater than the maximum value of 16mm ≤ H1 ≤ 48mm, the distance is too large, resulting in an excessively large gap above the first step surface 121. This reduces the volume and capacity of the electrode assembly body 1, failing to meet the energy supply requirements of the battery.

[0069] A comparison of Examples 7 to 12 with Comparative Examples 9 to 10 reveals that when the distance H2 between the first step surface 121 and the second step surface 122 along the first direction is less than the minimum value of the range 25mm≤H2≤200mm, the height difference between the first step surface 121 and the second step surface 122 is too small, resulting in insufficient size of the connecting surface 123 used to set the second electrode 22, reducing the current-carrying area of ​​the electrode 2 and failing to meet the current-carrying requirements. When the distance H2 between the first step surface 121 and the second step surface 122 along the first direction is greater than the maximum value of the range 25mm≤H2≤200mm, the height difference between the first step surface 121 and the second step surface 122 is too large, resulting in an excessively large gap above the second step surface 122, which reduces the volume and capacity of the electrode assembly body 1 and fails to meet the power supply requirements of the battery.

[0070] In this embodiment, as Figure 3 As shown, a battery is also provided, which includes a battery cover 100, a battery housing 200 and the aforementioned battery electrode assembly. The battery housing 200 is a hollow housing structure with at least one opening. The battery cover 100 is disposed at the opening of the battery housing 200 to close the battery housing 200 and form a receiving cavity for accommodating the battery electrode assembly.

[0071] By applying the aforementioned battery electrode assembly, this battery not only reduces the risk of safety issues caused by overheating, but also increases battery capacity, meeting the demand for improved battery energy density and providing longer battery life or longer power supply time.

[0072] Optionally, such as Figure 3As shown, when the support boss 11 has a mounting platform 12 on only one side along the second direction, the battery cover 100 includes a cover body 101 and a terminal module 102. The cover body 101 includes an expansion portion 1011 and a mounting portion 1012. The expansion portion 1011 has a hollow cavity. The support boss 11 is inserted into the expansion portion 1011. The mounting portion 1012 is located on the side of the expansion portion 1011 near the mounting platform 12. The terminal module 102 is connected to the mounting portion 1012 and connected to the tab 2. The portion of the terminal module 102 located outside the mounting portion 1012 is lower than the expansion portion 1011.

[0073] The battery cover 100 is designed with a cover body 101 consisting of an expansion section 1011 and a mounting section 1012, and the portion of the terminal module 102 connected to the mounting section 1012 located outside the mounting section 1012 is lower than the expansion section 1011. This effectively utilizes the space previously occupied by the terminal module 102 protruding from the cover body 101, reducing the space occupied on the outer side of the battery cover 100 and increasing the battery module assembly rate. Furthermore, the protruding expansion section 1011 provides protection for the terminal module 102, preventing damage from impacts. Additionally, the hollow cavity within the expansion section 1011 allows the battery terminal assembly to utilize the expansion section 1011 to set support protrusions 11, increasing its volume and improving battery capacity.

[0074] Example 2

[0075] Figures 4 to 6 Embodiment 2 is shown, wherein components that are the same as or corresponding to those in Embodiment 1 are referred to using the same reference numerals as those in Embodiment 1. For simplicity, only the differences between Embodiment 2 and Embodiment 1 are described.

[0076] The difference lies in that Embodiment 2 provides a battery electrode assembly that differs from Embodiment 1. In this battery electrode assembly, mounting recesses 12 are provided on both sides of the supporting boss 11 along the second direction. By providing mounting recesses 12 on both sides of the supporting boss 11, tabs 2 with first tab portions 21 and second tab portions 22 are respectively provided on both sides of the supporting boss 11, thereby forming a multi-tab structure that effectively increases the current-carrying area and reduces the temperature during the current-carrying process, thus improving the charging and discharging performance and safety of the battery.

[0077] Optionally, such as Figures 4 to 5 As shown, when mounting recesses 12 are provided on both sides of the support boss 11 along the second direction, the connecting plane 112 is vertically positioned between the support plane 111 and the first step surface 121. This forms a right-angle structure between the connecting plane 112 and the first step surface 121. Therefore, when the battery cover 100 is assembled with the battery electrode assembly, the right-angle structure can be used to limit the relative movement between the battery cover 100 and the battery electrode assembly, preventing relative misalignment.

[0078] In this embodiment, as Figure 6 As shown, a battery is also provided in this embodiment, and the battery cover 100 structure of the battery in this embodiment is different from that of the battery in embodiment one.

[0079] When the supporting boss 11 is provided with mounting recesses 12 on both sides along the second direction, the battery cover 100 includes a cover body 101 and a terminal module 102. The cover body 101 includes an expansion portion 1011 and a mounting portion 1012. The expansion portion 1011 has a hollow cavity. The supporting boss 11 is inserted into the expansion portion 1011. The expansion portion 1011 is provided with mounting portions 1012 on both sides along the second direction. Each mounting portion 1012 is connected to a terminal module 102. The terminal module 102 is connected to the tab 2.

[0080] The battery cover 100 not only has the advantages of the battery cover 100 in Embodiment 1, but also forms a multi-terminal structure because the two mounting parts 1012 on which the cover body 101 is provided are insulatedly connected to the terminal module 102, thereby dispersing the heat generation area, reducing the operating temperature of the individual terminal module 102, and improving the service life.

[0081] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A battery electrode assembly, characterized in that, The battery electrode assembly includes: The electrode assembly body includes a supporting boss and a mounting platform on at least one side along a first direction. The supporting boss is provided with the mounting platform on at least one side along a second direction. The mounting platform has a stepped structure and includes a first step surface, a second step surface, and a connecting surface. The first step surface is located between the supporting boss and the connecting surface. The connecting surface is located between the first step surface and the second step surface. The higher end of the connecting surface is connected to the first step surface, and the lower end of the connecting surface is connected to the second step surface. The electrode includes a first electrode portion and a second electrode portion. The first electrode portion is disposed on the first step surface, and the second electrode portion is disposed on the connecting surface and connected to the first electrode portion. The surface of the first electrode portion facing away from the first step surface is lower than the surface of the supporting boss facing away from the first step surface. The first direction is the length direction of the battery electrode assembly, and the second direction is the width direction of the battery electrode assembly; The length of the support boss along the second direction is W1, and the length of the pole assembly body along the second direction is L, satisfying 0.35≤W1 / L≤0.6; The length of the first step surface along the second direction is W2, and the length of the second step surface along the second direction is W3, satisfying 0.19≤W3 / W2≤0.9; The width dimension of the first electrode tab along the first direction and the width dimension of the second electrode tab along the second direction are both E, and satisfy 4.5mm≤E≤8mm; The supporting boss includes a supporting plane and a connecting plane. The connecting plane is located between the supporting plane and the first step surface. The supporting plane is located at the high end of the connecting plane, and the low end of the connecting plane is connected to the first step surface. The distance between the supporting plane and the first step surface along the first direction is H1, and satisfies 16mm≤H1≤48mm. The distance between the first step surface and the second step surface along the first direction is H2, and satisfies 25mm≤H2≤200mm.

2. The battery electrode assembly according to claim 1, characterized in that, When the mounting platform is provided on only one side of the support boss along the second direction, the connecting plane is inclined between the support plane and the first step surface; Alternatively, when the mounting platform is provided on both sides of the support boss along the second direction, the connecting plane is vertically disposed between the support plane and the first step surface.

3. A battery, characterized in that, The battery includes a battery cover, a battery housing, and a battery electrode assembly as described in any one of claims 1-2. The battery housing is a hollow housing structure with at least one opening. The battery cover is disposed at the opening of the battery housing to close the battery housing and form a receiving cavity for accommodating the battery electrode assembly.

4. The battery according to claim 3, characterized in that, When the supporting boss has the mounting platform on only one side along the second direction, the battery cover includes a cover body and a terminal module. The cover body includes an expansion portion and a mounting portion. The expansion portion has a hollow cavity. The supporting boss is inserted into the expansion portion. The mounting portion is located on the side of the expansion portion near the mounting platform. The terminal module is connected to the mounting portion and connected to the electrode tab. The portion of the terminal module located outside the mounting portion is lower than the expansion portion.

5. The battery according to claim 3, characterized in that, When the mounting platform is provided on both sides of the support boss along the second direction, the battery cover plate includes a cover plate body and a terminal module. The cover plate body includes an expansion portion and a mounting portion. The expansion portion has a hollow cavity. The support boss is inserted into the expansion portion. The mounting portion is provided on both sides of the expansion portion along the second direction. The terminal module is connected to each mounting portion. The terminal module is connected to the tab.

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