Lithium battery

Abstract

The utility model relates to battery technical field discloses a lithium cell, including cover plate subassembly, cover plate subassembly includes top cap, lower plastic and two first bosses, lower plastic is located top cap one side along its thickness direction, two first bosses protrude in lower plastic side away from top cap, two first bosses are along lower plastic length direction interval distribution, top cap length is x, the size of first boss along lower plastic length direction is e, the utility model discloses through to the first boss along lower plastic length direction size reasonable design, first boss abuts at core package, can make lower plastic with core package between having stable pole lug shaping space, avoids shaping space unstable and leads to pole lug upside down and inserts into core package and causes short circuit.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a lithium battery. Background Technology

[0002] Existing lithium batteries consist of a cover plate, aluminum shell, core pack, connecting tabs, and insulating film. The cover plate comprises a pressure ring, upper plastic for positive and negative electrodes, a plain aluminum sheet, a sealing ring, lower plastic, positive and negative electrode posts, an explosion-proof valve, and a protective sheet. The cover plate and lower plastic are integrally injection molded. Bosses are located on both sides of the lower plastic along its length and opposite the explosion-proof valve. Electrode post holes are located immediately adjacent to the two side bosses. The width of the boss corresponding to the explosion-proof valve is narrower than the width of the explosion-proof valve. If the width of the bosses in the lower plastic of the cover plate is too small, the contact surface between the core pack and the boss will be too small, making the core pack prone to movement. This leads to instability in the tab shaping space between the lower plastic and the core pack, potentially causing the tabs to be inserted backwards into the core pack during the tab shaping process, resulting in a short circuit in the cell and even a serious safety accident. Utility Model Content

[0003] One of the objectives of this utility model embodiment is to provide a lithium battery that can provide a stable shaping space for the tabs, thereby avoiding short circuits caused by the tabs being inserted backwards into the core pack due to unstable shaping space.

[0004] The second objective of this utility model embodiment is to provide a lithium battery that can provide sufficient shaping space for the tabs, preventing the shaped tabs from being inserted backwards into the core pack and causing a short circuit in the lithium battery, thereby improving the yield and safety of the lithium battery.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A lithium battery is provided, including a cover assembly. The cover assembly includes a top cover, a lower plastic component, and two first protrusions. The lower plastic component is located on one side of the top cover along its thickness direction. The two first protrusions protrude from the lower plastic component on the side opposite to the top cover, and are spaced apart along the length direction of the lower plastic component. The length of the top cover is x, and the dimension of the first protrusions along the length direction of the lower plastic component is e. .

[0007] As a further embodiment of the lithium battery, the sum of the height of the first boss and the thickness of the lower plastic is a, where a = 5~10mm, and the thickness of the lower plastic is k, where k = 0.8~2mm.

[0008] As a further embodiment of the lithium battery, the length of the lower plastic is y, where y = x - l1, and l1 = 2~4 mm; the width of the top cover is v, and the width of the lower plastic is w, where w = v - l2, and l2 = 2~4 mm.

[0009] As a further embodiment of the lithium battery, the cover plate assembly also includes two terminals, which are spaced apart along the length of the cover plate assembly, and the center distance between the two terminals is o, where o / x = 0.6~0.7.

[0010] As a further embodiment of the lithium battery, the cover assembly also includes a second boss and an explosion-proof valve. The explosion-proof valve is disposed on the top cover and located between the two pole posts. The second boss is directly opposite the explosion-proof valve. The two first bosses are adjacent to the two ends of the lower plastic along its length. The two pole posts are located between the two first bosses. The first bosses and the second bosses are at the same height.

[0011] As a further embodiment of the lithium battery, the cover assembly also includes a third protrusion, with two third protrusions respectively protruding on the opposite side of the two first protrusions, forming a groove between the first protrusions and the corresponding two third protrusions, the electrode portion extending into the groove, and the two third protrusions respectively adjacent to the edge of the lower plastic in the width direction.

[0012] As a further embodiment of the lithium battery, the first boss has a first side facing the electrode post, and the cover plate assembly is provided with a mounting hole corresponding to the electrode post. The distance between the edge of the mounting hole and the first side of the adjacent first boss is p, where p = 0~10mm.

[0013] As a further embodiment of the lithium battery, it also includes a core pack, tabs, and multiple insulating adhesives. The first, second, and third protrusions abut against the core pack. The lower plastic and the core pack are spaced apart to form a tab shaping space. One end of the tab along its length is inserted into the core pack, and the other end extends into the tab shaping space. Each tab has a corresponding insulating adhesive attached to it, covering the corresponding tab. The insulating adhesive has a second side facing the first protrusion adjacent to it. The first protrusion has a third side facing away from the insulating adhesive. The distance between the second side and the third side is z. Along the length of the lower plastic, the distance between the outer side of the tab and the outer side of the core pack is g, where z = g - l3, and l3 = 2~5 mm.

[0014] As a further embodiment of the lithium battery, along the length direction of the lower plastic, the size of the insulating adhesive is n, and the size of the electrode tab is h, where n = h + l4, and l4 = 4~10 mm.

[0015] As a further embodiment of the lithium battery, along the length of the lower plastic, the sum of the dimensions of the first boss and the third boss is c, where c = z - l5, and l5 = 2~5 mm.

[0016] As a further embodiment of the lithium battery, the dimension of the second boss is b along the length direction of the lower plastic. l6 = 1~4mm; and / or,

[0017] The distance between the third protrusion and the adjacent second protrusion is d, where c+d=z+n+l7 / 2, and l7=1~4mm.

[0018] As a further embodiment of the lithium battery, the dimension of the core pack along the length direction of the lower plastic is i, i=y-l8, l8=1~2mm.

[0019] Beneficial effects:

[0020] This invention controls the dimension of the first protrusion along the length of the lower plastic to be 0.1 to 0.15 times the length of the lower plastic, which can ensure sufficient contact area between the first protrusion and the core package, thereby providing a stable tab shaping space between the lower plastic and the core package and preventing the tab from being inserted backward into the core package due to an unstable shaping space.

[0021] This invention controls the sum of the height of the boss structure and the thickness of the lower plastic within the range of 5-10mm, and controls the thickness of the lower plastic within the range of 0.8-2mm. This allows for sufficient space between the lower plastic and the core pack to accommodate the tabs, preventing the tabs from bending backward, wrinkling, or experiencing stress concentration due to an excessively short boss structure. This ensures that the tabs are flat and the stress distribution is uniform, preventing the tabs from being inserted backward into the core pack and eliminating the risk of short circuits. At the same time, it ensures that the lithium battery has sufficient capacity and also limits the movement of the core pack, preventing it from shaking inside the casing. Attached Figure Description

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] Figure 1 This is a schematic diagram of the lithium battery (excluding the casing) described in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the assembly of the cover plate assembly described in this embodiment of the utility model. Figure 1 ;

[0025] Figure 3 This is a schematic diagram of the assembly of the cover plate assembly described in this embodiment of the utility model. Figure 2 ;

[0026] Figure 4 for Figure 3 A magnified view of part A in the image;

[0027] Figure 5 This is an assembly diagram of the cover plate assembly and connecting piece according to an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the assembly of the core package and electrode tabs according to an embodiment of the present invention.

[0029] In the picture:

[0030] 100, Cover plate assembly; 1001, Mounting hole; 110, Top cover; 120, Lower plastic; 130, First boss; 140, Pole post; 150, Second boss; 160, Explosion-proof valve; 170, Third boss; 200, Core package; 300, Pole tab; 400, Insulating adhesive; 500, Connecting piece. Detailed Implementation

[0031] To make the technical problems solved by this utility model, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] In the description of this utility model, 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 utility model based on the specific circumstances.

[0033] 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.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationships shown in the accompanying drawings. They are used solely for ease of description and simplification of operation, and do not indicate or imply that the device or component 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. Furthermore, the terms "first," "second," etc., are merely used for distinction in description and have no special meaning.

[0035] like Figure 1 , Figure 2 and Figure 3 As shown, the lithium battery in this embodiment includes a cover assembly 100, which includes a top cover 110, a lower plastic 120, and two first protrusions 130. The lower plastic 120 is located on one side of the top cover 110 along its thickness direction, and the two first protrusions 130 protrude from the lower plastic 120 on the side opposite to the top cover 110. The two first protrusions 130 are spaced apart along the length direction of the lower plastic 120. The length of the top cover 110 is x, and the dimension of the first protrusions 130 along the length direction of the lower plastic 120 is e. .

[0036] like Figure 2 and Figure 3 As shown, in this embodiment, two first protrusions 130 are provided on the side of the lower plastic 120 opposite to the top cover 110, and the two first protrusions 130 are spaced apart along the length of the lower plastic 120 to abut against the core package 200, so that the lower plastic 120 and the core package 200 form a tab shaping space; by controlling the width of the first protrusions 130 (the dimension along the length of the lower plastic 120) within (For example or Within the range of (etc.), the first protrusion 130 and the core package 200 can have sufficient contact area to improve the contact stability of the first protrusion 130 with the core package 200, thereby improving the stability of the tab shaping space between the lower plastic 120 and the core package 200.

[0037] Furthermore, the sum of the height of the first boss 130 and the thickness of the lower plastic 120 is a, where a = 5~10mm, and the thickness of the lower plastic 120 is k, where k = 0.8~2mm.

[0038] Understandably, after the core package 200 is inserted into the housing and the tabs 300 are welded, and before the cover assembly 100 is encapsulated, it undergoes a shaping process. Pressure is applied to the core package 200 to shape it to a predetermined thickness and size, ensuring it can fit into the housing. During this shaping process, the tabs 300 connected to the core package 200 are subjected to a downward force. If the height of the protrusion on the side of the lower plastic 120 facing away from the top cover 110 is insufficient, the tabs 300 may bend backward and insert upside down into the core package 200, posing a risk of puncturing the diaphragm inside the core package 200, leading to a short circuit and potentially causing thermal runaway. If the height of the protrusion structure is too high, it will reduce the height of the core package 200, thereby reducing the cell's capacity. By controlling the sum of the thicknesses of the first boss 130 and the lower plastic 120 within the range of 5~10mm (e.g., 5mm, 5.2mm, 5.5mm, 5.8mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, or 10mm) and controlling the thickness of the lower plastic 120 within the range of 0.8~2mm (e.g., 0.8mm, 0.9mm, 1mm, 1.1mm, 1mm...), Within the range of 0.2mm, 1.3mm, 1.5mm, 1.8mm or 2mm, the height of the first protrusion 130 can be moderate, ensuring that there is sufficient space for the electrode tab to be shaped between the lower plastic 120 and the core package 200 to accommodate the electrode tab 300. This prevents the electrode tab 300 from bending backward, wrinkling or stress concentration due to the first protrusion 130 being too short, ensuring that the electrode tab 300 has a flat shape and uniform stress distribution, preventing the electrode tab 300 from being inserted backward into the core package 200, and eliminating the risk of short circuit.

[0039] Furthermore, the length of the lower plastic 120 is y, where y = x - l1, and l1 = 2~4 mm; the width of the top cover 110 is v; and the width of the lower plastic 120 is w, where w = v - l2, and l2 = 2~4 mm. For example, l1 can be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, or 4 mm, etc.; l2 can be 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, or 4 mm, etc. By controlling the difference between the length of the top cover 110 and the length of the lower plastic 120 to 2~4mm, a suitable distance can be made between the outer edge of the lower plastic 120 and the outer edge of the top cover 110, which facilitates the connection between the edge of the top cover 110 and the housing.

[0040] Furthermore, such as Figure 3As shown, the assembly also includes two terminals 140, which are spaced apart along the length of the cover assembly 100. The center distance between the two terminals 140 is θ, where θ / x = 0.6~0.7. For example, the ratio of the center distance of the terminals 140 to the length of the top cover 110 is 0.6, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, or 0.7, etc. By controlling the appropriate center distance of the terminals 140, the potential distribution of the lithium battery can be optimized.

[0041] Furthermore, the cover assembly 100 also includes a second boss 150 and an explosion-proof valve 160. The explosion-proof valve 160 is disposed on the top cover 110 and located between the two pole posts 140. The second boss 150 is directly opposite the explosion-proof valve 160. The two first bosses 130 are adjacent to the two ends of the lower plastic 120 in the length direction. The two pole posts 140 are located between the two first bosses 130. The first bosses 130 and the second bosses 150 are at the same height.

[0042] This embodiment designs three protrusions. The space between two adjacent protrusions can limit the position of the tab 300. By having multiple protrusions abut against the core package 200, the stability of the core package 200 can be further improved. The second protrusion 150 has a through hole facing the explosion-proof valve 160.

[0043] Preferably, the top cover 110 is made of aluminum sheet, and the lower plastic 120, the first boss 130 and the second boss 150 are integrally injection molded on one side of the top cover 110 along its thickness direction, resulting in high structural stability.

[0044] Furthermore, the cover plate assembly 100 also includes a third boss 170. Two third bosses 170 are respectively provided on the opposite side of the two first bosses 130. A groove is formed between the first bosses 130 and the corresponding two third bosses 170. The pole post 140 extends into the groove, and the two third bosses 170 are respectively adjacent to the edge of the lower plastic 120 in the width direction.

[0045] The first protrusion 130 and the two third protrusions 170 form a U-shaped structure, which increases the contact area with the core package 200. The pole post 140 is partially located in the groove, which makes the structure of the cover assembly 100 more compact. After the core package 200 is inserted into the housing and the cover assembly 100 is sealed, the first protrusion 130, the second protrusion 150 and the third protrusion 170 on the inner side of the cover assembly 100 will support and limit the core package 200, preventing the core package 200 from shaking inside the housing.

[0046] Furthermore, each first boss 130 and the corresponding two third bosses 170 are integrally injection molded structures, resulting in structural stability.

[0047] In this embodiment, the first protrusion 130 has a first side surface (inner edge) facing the pole post 140, and the cover plate assembly 100 is provided with mounting holes 1001 corresponding to the pole post 140, such as Figure 4 As shown, the distance between the edge of the mounting hole 1001 and the first side surface of the adjacent first boss 130 is p, where p = 0~10mm.

[0048] In this embodiment, the distance between the mounting hole 1001 and the first boss 130 is controlled while ensuring a good potential distribution of the lithium battery, so that the first boss 130 can provide good support for the core package 200.

[0049] For example, the distance between the edge of the mounting hole 1001 and the first side surface of the adjacent first boss 130 is 0, that is, the inner edge of the first boss 130 is tangent to the hole wall of the mounting hole 1001; in other examples, the distance between the hole wall of the mounting hole 1001 and the first side surface of the adjacent first boss 130 may also be 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm or 10mm, etc.

[0050] Furthermore, such as Figure 1 and Figure 6 As shown, the lithium battery in this embodiment also includes a core pack 200, tabs 300, and multiple insulating adhesives 400. A first protrusion 130, a second protrusion 150, and a third protrusion 170 abut against the core pack 200. The lower plastic and the core pack 200 are spaced apart to form a tab shaping space. One end of the tab 300 along its length is inserted into the core pack 200, and the other end extends into the tab shaping space. Each tab 300 is correspondingly attached with an insulating adhesive 400, which covers the corresponding tab 300. The insulating adhesive 400 has a second side facing the adjacent first protrusion 130. The first protrusion 130 has a third side facing away from the insulating adhesive 400. The distance between the second side and the third side is z. Along the length of the lower plastic 120, the distance between the outer side of the tab 300 and the outer side of the core pack 200 is g, where z = g - l3, and l3 = 2~5 mm.

[0051] For example, l3 can be 2mm, 2.1mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm, or 5mm, etc. By controlling the difference between the distance z between the second and third sides and the distance g between the outer side of the tab 300 and the outer side of the core package 200 within the range of 2~5mm, the insulating adhesive 400 can completely cover the tab 300, ensuring the insulation of the tab 300.

[0052] Furthermore, along the length of the lower plastic 120, the size of the insulating adhesive 400 is n, and the size of the tab 300 is h, where n = h + l4, and l4 = 4~10 mm, for example, 4 mm, 4.2 mm, 4.5 mm, 4.8 mm, 5 mm, 5.2 mm, 5.5 mm, 5.8 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, or 10 mm, etc. By controlling the difference between the dimensions of the insulating adhesive 400 and the tab 300 along the length of the lower plastic 120 within the range of 4~10 mm, the insulating adhesive 400 fully covers the tab 300 and extends beyond the edge of the tab 300, further ensuring the insulation of the tab 300.

[0053] In this embodiment, along the length of the lower plastic 120, the sum of the dimensions of the first boss 130 and the third boss 170 is c, where c = z - l5, and l5 = 2~5 mm.

[0054] By controlling the difference between the distance z between the second and third sides and the sum c of the dimensions of the first boss 130 and the third boss 170 to 2~5mm, such as 2mm, 2.1mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, it is possible to prevent the insulating adhesive 400 from interfering with the second boss 150.

[0055] Furthermore, along the length of the lower plastic 120, the dimension of the first boss 130 is b. l6 = 1~4mm, such as 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm or 4mm, etc., to better support the core package 200 and prevent the core package 200 from shaking inside the shell.

[0056] In this embodiment, the distance between the third protrusion 170 and the adjacent second protrusion 150 is d, c+d=z+n+l7 / 2, l7=1~4mm, for example 1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.3mm, 2.5mm, 2.6mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm or 4mm, so that there is enough space between the first protrusion 130 and the second protrusion 150 for pasting the insulating adhesive 400 to cover the tab 300.

[0057] Furthermore, the dimension of the core package 200 along the length direction of the lower plastic 120 is i, i=y-l8, l8=1~2mm, such as 1mm, 1.1mm, 1.2mm, 1.4mm, 1.5mm, 1.8mm or 2mm, etc. By controlling the difference between the length of the lower plastic 120 and the dimension of the core package 200 along the length direction of the lower plastic 120 within the range of 1~2mm, a certain assembly gap can be provided between the core package 200 and the shell, thereby improving the assembly efficiency of the core package 200.

[0058] In this embodiment, the first boss 130 faces the explosion-proof valve 160, but does not completely block the explosion-proof valve 160, so as to ensure that the explosion-proof valve 160 opens normally to release pressure when it reaches its opening pressure.

[0059] Specifically, such as Figure 1 and Figure 5 As shown, the lithium battery in this embodiment also includes a connecting piece 500 and a housing. The terminal 140 is welded to the tab 300 through the connecting piece 500. The structures of the core pack 200, the explosion-proof valve 160, the terminal 140, and the assembly structure of the cover plate assembly 100 and the housing in this embodiment are all conventional technologies in the field, and will not be described in detail here.

[0060] This embodiment effectively solves the problem of inverted insertion of the core pack 200 due to insufficient space in the tab 300 by rationally designing the various structural dimensions of the lithium battery, thus ensuring the yield of the cell manufacturing process and the safety of its use.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A lithium battery, characterized in that, The device includes a cover assembly comprising a top cover, a lower plastic component, and two first protrusions. The lower plastic component is located on one side of the top cover along its thickness direction, and the two first protrusions protrude from the lower plastic component on the side opposite to the top cover. The two first protrusions are spaced apart along the length direction of the lower plastic component. The length of the top cover is x, and the dimension of the first protrusions along the length direction of the lower plastic component is e. .

2. The lithium battery according to claim 1, characterized in that, The sum of the height of the first boss and the thickness of the lower plastic is a, where a = 5~10mm, and the thickness of the lower plastic is k, where k = 0.8~2mm.

3. The lithium battery according to claim 1, characterized in that, The length of the lower plastic is y, where y = x - l1, and l1 = 2~4 mm; the width of the top cover is v, and the width of the lower plastic is w, where w = v - l2, and l2 = 2~4 mm.

4. The lithium battery according to claim 3, characterized in that, The cover plate assembly also includes two pole posts, which are spaced apart along the length of the top cover, and the center distance between the two pole posts is o, o / x = 0.6~0.

7.

5. The lithium battery according to claim 4, characterized in that, The cover plate assembly also includes a second boss and an explosion-proof valve. The explosion-proof valve is disposed on the top cover and located between the two pole posts. The second boss is directly opposite the explosion-proof valve. The two first bosses are adjacent to the two ends of the lower plastic in the length direction. The two pole posts are located between the two first bosses. The first bosses and the second bosses are at the same height.

6. The lithium battery according to claim 5, characterized in that, The cover plate assembly further includes a third protrusion, and two third protrusions are respectively provided on the opposite side of the two first protrusions. A groove is formed between the first protrusions and the corresponding two third protrusions. The pole post extends into the groove, and the two third protrusions are respectively adjacent to the edge of the lower plastic in the width direction.

7. The lithium battery according to claim 6, characterized in that, The first boss has a first side facing the pole post, and the cover plate assembly is provided with a mounting hole corresponding to the pole post. The distance between the edge of the mounting hole and the first side of the adjacent first boss is p, where p = 0~10mm.

8. The lithium battery according to claim 6, characterized in that, It also includes a core package, tabs, and multiple insulating adhesives. The first, second, and third protrusions abut against the core package. The lower plastic and the core package are spaced apart to form a tab shaping space. One end of the tab along its length is inserted into the core package, and the other end extends into the tab shaping space. Each tab has a corresponding insulating adhesive attached to it, covering the corresponding tab. The insulating adhesive has a second side facing the first protrusion adjacent to it. The first protrusion has a third side facing away from the insulating adhesive. The distance between the second side and the third side is z. Along the length of the lower plastic, the distance between the outer side of the tab and the outer side of the core package is g, where z = g - l3, and l3 = 2~5 mm.

9. The lithium battery according to claim 8, characterized in that, Along the length of the lower plastic, the size of the insulating adhesive is n, and the size of the electrode tab is h, where n = h + l4, and l4 = 4~10 mm.

10. The lithium battery according to claim 9, characterized in that, Along the length of the lower plastic, the sum of the dimensions of the first boss and the third boss is c, where c = z - l5, and l5 = 2~5 mm.

11. The lithium battery according to claim 10, characterized in that, Along the length of the lower plastic part, the dimension of the second boss is b. l6 = 1~4mm; and / or, The distance between the third protrusion and the adjacent second protrusion is d, where c+d=z+n+l7 / 2, and l7=1~4mm.

12. The lithium battery according to any one of claims 8 to 11, characterized in that, The core pack has a dimension i along the length of the lower plastic, where i = y - l8 and l8 = 1~2 mm.

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