Pole structure, cover plate assembly and battery

Abstract

The utility model relates to the technical field of batteries, and discloses a pole structure, a cover plate assembly and a battery. The pole bottom plate comprises a pole section, a fusing section and a tab welding section which are sequentially connected in the length direction of the pole bottom plate, one side of the pole section is fixedly connected with one end of the pole body, the tab welding section is suitable for being welded with a tab of a pole group, and the tab is located on the side, away from the pole body, of the pole bottom plate; the thickness of the fusing section is smaller than the thicknesses of the pole section and the tab welding section, a through groove is formed in the fusing section, and the through groove penetrates through the fusing section in the thickness direction of the pole bottom plate. The pole body and the pole bottom plate are integrated into a whole, so that the use of connecting pieces is reduced, the number of parts is reduced, the connecting pieces are prevented from being bent and occupying large space, and the production efficiency is improved; the fusing section is arranged on the pole bottom plate, so that when a relatively large current flows through the fusing section, the fusing section is broken firstly, the connection between the pole section and the tab welding section is cut off, and overcurrent protection is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole structure, a cover plate assembly and a battery. Background Art

[0002] With the widespread application of batteries in electric vehicles and energy storage fields, the requirements for battery performance and safety are increasing. The battery is mainly composed of a shell, a pole group and a cover assembly, among which the cover assembly is the core component of the safety and sealing of the battery. In order to provide overload protection, the battery in the prior art usually has a connecting plate between the cover assembly and the pole group, and a fuse structure is provided on the connecting plate. The connecting plate is connected between the pole column on the cover assembly and the pole ear of the pole group to achieve electrical connection between the pole column and the pole group. When the current of the battery charge / discharge is too large and exceeds its carrying capacity, the fuse structure on the connecting plate melts, and the connecting plate is disconnected, thereby disconnecting the electrical connection between the pole column and the pole group, achieving a circuit breaker, and preventing the battery from further charging / discharging and causing danger.

[0003] However, during the battery assembly process, one side of the connecting piece needs to be welded to the pole and the other side needs to be welded to the pole lug. The operation process is cumbersome, the process steps are complicated, the assembly efficiency is low, and after the connecting piece is bent, it is connected to the pole and the pole lug respectively. The space required for bending the connecting piece is large, which occupies too much internal space of the battery and has a great impact on the battery capacity. Utility Model Content

[0004] In view of this, the utility model provides a pole structure, a cover plate assembly and a battery to solve the problem of low assembly efficiency and excessive battery internal space occupation by the connecting piece after bending.

[0005] In the first aspect, the utility model provides a pole structure, comprising: a pole body; a pole base plate, comprising a pole section, a fuse section and a pole lug welding section connected in sequence along its length direction, one side of the pole section is fixedly connected to one end of the pole body, the pole lug welding section is suitable for welding to the pole lug of a pole group, and the pole lug is located on a side of the pole base plate away from the pole body, the thickness of the fuse section is less than the thickness of the pole section and the pole lug welding section, and a through groove is constructed on the fuse section, and the through groove passes through the fuse section along the thickness direction of the pole base plate.

[0006] Beneficial effects: by fixing the pole bottom plate at one end of the pole body, the pole body and the pole bottom plate are integrated into one, and the pole bottom plate and the pole ear are directly welded to realize the electrical connection between the pole structure and the pole group, which can reduce the use of traditional connecting plates, reduce the number of parts used in the battery assembly process, and is easy to install and fix safely. It can also simplify the process steps and the operation process is simple, thereby improving production efficiency and reducing costs. In addition, the pole bottom plate is a thin plate, which can also avoid the large space occupied by the bending of the connecting plate and avoid affecting the battery capacity. At the same time, by arranging the fuse section on the pole bottom plate, the thickness of the fuse section is less than the thickness of the pole section and the pole ear welding section, and the fuse section is configured with a through groove penetrating along the thickness direction, so that the cross-sectional area of ​​the fuse section is small. When a large current flows through the pole structure, the heat generated by the fuse section is large, and the fuse section breaks first, cutting off the connection between the pole section and the pole ear welding section, thereby disconnecting the electrical connection between the pole body and the pole ear, avoiding further charging / discharging of the battery, thereby realizing overcurrent protection of the battery and improving the safety of the battery.

[0007] In an optional embodiment, in a cross section perpendicular to the length direction of the pole bottom plate, the cross-sectional area of ​​the solid part of the fuse section is S, where 5mm 2 ≤S≤20mm 2 .

[0008] Beneficial effect: By limiting the cross-sectional area S of the solid part of the fuse section to 5mm 2 -20 mm 2 Taking values ​​within the range can not only ensure the strength of the pole structure, but also ensure that the pole structure can be blown in time with good blowing effect, thereby ensuring the safety of the battery.

[0009] In an optional implementation, the length of the pole bottom plate is W, and the length of the pole tab welding section is L, which satisfies: 0.5≤L / W≤0.8.

[0010] Beneficial effect: By setting the ratio L / W of the length of the pole lug welding section to the length of the pole bottom plate within the range of 0.5 to 0.8, it is possible to provide sufficient welding area for the pole lug welding to ensure effective welding of the pole lug and the pole structure, and to avoid the length of the pole lug welding section being too long to affect the strength of the pole bottom plate, thereby improving the reliability and stability of the pole structure.

[0011] In an optional implementation, the length W of the pole bottom plate has a value range of 40 mm ≤ W ≤ 90 mm; and / or the thickness H of the pole bottom plate has a value range of 1.2 mm ≤ H ≤ 4 mm.

[0012] Beneficial effects: By setting the length of the pole bottom plate to a value between 40mm-90mm, it is ensured that there is enough space for welding with the pole lug and the quality of the pole lug welding is guaranteed, and the length of the pole bottom plate can be avoided to weaken the structural strength of the pole bottom plate due to being too long, and the pole bottom plate can be avoided to bend and deform. It can also avoid the pole bottom plate from being too heavy and reducing the energy density of the battery. By setting the thickness H of the pole bottom plate to a value within the range of 1.2mm-4mm, it can be ensured that the pole bottom plate can be formed and has sufficient supporting strength, avoiding bending and deformation due to insufficient strength, and avoiding the generation of welding melt during welding, thereby ensuring the welding quality and the reliability of the connection between the pole structure and the pole lug, and avoiding excessive weight and increasing costs, thereby achieving increased capacity and reduced costs for the battery.

[0013] In an optional implementation, the pole body and the pole bottom plate are welded or integrally formed.

[0014] Beneficial effects: The production and processing of the pole body and the pole bottom plate are relatively simple, which can reduce the material consumption, and the welding connection method has high reliability. The pole body and the pole bottom plate are integrally formed, which is easy to produce and has good stability.

[0015] In an optional implementation, the pole structure further includes: insulating glue, the insulating glue includes a surrounding portion and a filling portion, the surrounding portion is wrapped around the outer surface of the fuse section, and the filling portion is filled in the through groove.

[0016] Beneficial effect: By coating the outer surface of the fuse section of the pole structure with insulating glue, the fuse section is protected, and by providing a filling part to fill the through groove, the filling part plays a supporting role, which can increase the strength and stability of the pole bottom plate. The slag after the fuse section is melted is wrapped by the insulating glue, which prevents the slag from falling directly into the battery and causing damage such as a short circuit of the pole group, thereby further improving the safety of the battery.

[0017] In an optional implementation, the insulating glue is injection molded on the pole bottom plate.

[0018] Beneficial effects: The injection molding method is simple to form and convenient to process, so that the shape of the insulating glue and the fuse section have a high degree of fit and the cost is low.

[0019] In the second aspect, the utility model further provides a cover assembly, including: a cover body, which is configured with a first through hole; an upper plastic, which is arranged on one side of the cover body, and a second through hole corresponding to the first through hole is configured on the upper plastic; a lower plastic, which is arranged on a side of the cover body away from the upper plastic, and a third through hole corresponding to the first through hole is configured on the lower plastic; the above-mentioned pole structure, wherein the pole bottom plate of the pole structure is located on a side of the lower plastic away from the cover body, and the pole body passes through the third through hole, the first through hole and the second through hole in sequence; a rivet block, which is arranged on a side of the upper plastic away from the cover body, and the rivet block is riveted to the pole body. Because the cover assembly includes a pole structure, it has the same effect as the pole structure, and it will not be repeated here.

[0020] In a third aspect, the utility model further provides a battery, comprising: a housing having an open end; a pole group arranged inside the housing, the pole group having a pole lug; the above-mentioned cover plate assembly, the cover plate assembly being arranged at the open end of the housing to close the housing, and the pole column structure being welded to the pole lug through the pole lug welding section. Because the battery includes the cover plate assembly, it has the same effect as the cover plate assembly, and will not be described in detail here.

[0021] In an optional embodiment, the battery further comprises: an insulating sheet, which is arranged on a side of the pole bottom plate away from the pole body and corresponds to the pole segment on the pole bottom plate.

[0022] Beneficial effect: By arranging an insulating sheet on the side of the pole segment away from the pole body, the insulating sheet is located between the pole segment and the pole group, thereby ensuring the insulation between the pole segment and the pole group, and further improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a pole structure according to an embodiment of the utility model;

[0025] Figure 2 This is a schematic structural diagram of a pole bottom plate according to an embodiment of the utility model;

[0026] Figure 3 for Figure 2 A top view of the pole base plate shown;

[0027] Figure 4 for Figure 3 Cross-section view in the AA direction;

[0028] Figure 5 This is a schematic diagram of the structure of an insulating adhesive according to an embodiment of the utility model;

[0029] Figure 6 It is an assembly diagram of the pole body, pole bottom plate and insulating glue of the embodiment of the utility model;

[0030] Figure 7 This is a structural schematic diagram of a cover plate assembly according to an embodiment of the utility model;

[0031] Figure 8 for Figure 7 A top view of the cover assembly shown;

[0032] Fig. 9 for Figure 7 a bottom view of the cover assembly shown;

[0033] Fig.10 for Figure 7 A side view of the cover assembly is shown;

[0034] Fig.11 It is a schematic diagram of an exploded view of a cover plate assembly according to an embodiment of the utility model.

[0035] Description of reference numerals:

[0036] 1. Pole body; 2. Pole bottom plate; 201. Pole section; 202. Fuse section; 212. Through groove; 203. Ear welding section; 204. Positioning hole; 3. Cover body; 301. First through hole; 4. Upper plastic; 401. Second through hole; 5. Lower plastic; 501. Third through hole; 6. Riveting block; 601. Fourth through hole; 7. Insulating glue; 701. Surrounding part; 702. Filling part; 8. Insulating sheet. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0038] In the related art, the cover plate assembly includes a connecting piece, on which a fuse structure is arranged. Although it can provide overload protection for the battery, the connecting piece not only requires a large bending distance, but also occupies too much internal space of the battery, thus having a great impact on the battery capacity; moreover, the existence of the connecting piece leads to a large number of parts in the cover plate assembly, thereby increasing the cost of the structural parts. The operation process of welding the connecting piece to the pole and the pole ear is cumbersome, the process steps are complicated, the assembly efficiency is low, the production process is relatively complicated, and both the production efficiency and the cost are affected.

[0039] Combine the following Figures 1 to 11 , describing an embodiment of the utility model.

[0040] According to an embodiment of the present utility model, on the one hand, a pole structure is provided, such as Figures 1 to 6 As shown, the pole structure includes: a pole body 1 and a pole bottom plate 2. The pole bottom plate 2 includes a pole section 201, a fuse section 202 and a pole ear welding section 203 connected in sequence along its length direction. One side of the pole section 201 is fixedly connected to one end of the pole body 1. The pole ear welding section 203 is suitable for welding with the pole ear of the pole group, and the pole ear is located on the side of the pole bottom plate 2 away from the pole body 1. The thickness of the fuse section 202 is less than that of the pole section 201 and the pole ear welding section 203. A through groove 212 is constructed on the fuse section 202, and the through groove 212 passes through the fuse section 202 along the thickness direction of the pole bottom plate 2. Among them, the length direction refers to Figure 1 The arrow in the middle refers to the "length direction"; the thickness direction refers to Figure 1 The arrow in the middle points to the “thickness direction”; thickness refers to the thickness along Figure 1 The arrow in the middle points to the dimension in the "thickness direction".

[0041] The pole structure of this embodiment is applied, by fixing the pole bottom plate 2 at one end of the pole body 1, the pole body 1 and the pole bottom plate 2 are integrated into one body, and the pole bottom plate 2 is directly welded to the pole ear to realize the electrical connection between the pole structure and the pole group, which can reduce the use of traditional connecting pieces, reduce the number of parts used in the battery assembly process, and is easy to install and fix safely. It can also simplify the process steps and the operation process, thereby improving production efficiency and reducing costs. In addition, the pole bottom plate 2 is a thin plate, which can also avoid the large space occupied by the bending of the connecting piece and avoid affecting the battery capacity. At the same time, by The fuse section 202 is arranged on the pole bottom plate 2, the thickness of the fuse section 202 is less than the thickness of the pole section 201 and the pole ear welding section 203, and a through groove 212 is constructed on the fuse section 202 that penetrates along the thickness direction, so that the cross-sectional area of ​​the fuse section 202 is small. When a large current flows through the pole structure, the fuse section 202 generates a large amount of heat, and the fuse section 202 breaks first, cutting off the connection between the pole section 201 and the pole ear welding section 203, thereby disconnecting the electrical connection between the pole body 1 and the pole ear, avoiding further charging / discharging of the battery, thereby realizing overcurrent protection for the battery and improving the safety of the battery.

[0042] It should be noted that the thickness of the fuse section 202 is smaller than the thickness of the pole section 201 and the pole ear welding section 203, and the cross-sectional area of ​​the fuse section 202 itself is smaller than the cross-sectional area of ​​other parts on the pole bottom plate 2. Furthermore, a through groove 212 is constructed on the fuse section 202 to form a fuse (fuse structure). The through groove 212 is equivalent to hollowing out a part of the fuse section 202, and the cross-sectional area of ​​the remaining solid part of the fuse section 202 is further reduced. When a large current flows through the pole structure, the resistance of the fuse section 202 is large, and the heat generated at the fuse section 202 on the pole bottom plate 2 is large, and it breaks first, that is, the fuse section 202 is melted when the current is overloaded. Among them, the cross-sectional area refers to the area on the cross section perpendicular to the length direction of the pole bottom plate 2. Further combined with Figure 3 to Figure 4 As shown, the cross-sectional area of ​​the fuse section 202 refers to the cross-sectional area along Figure 3 The area of ​​the AA section shown is Figure 4 The area of ​​the shaded portion.

[0043] In one embodiment, the upper surface of the fuse section 202 is lower than the upper surface of the pole section 201 and the pole tab welding section 203, that is, a portion of the upper surface of the pole bottom plate 2 is recessed downward to form a flat groove running through the width direction of the pole bottom plate 2, and the size of the flat groove along the length direction of the pole bottom plate 2 is equal to the size of the fuse section 202 along the length direction of the pole bottom plate, so that the thickness of the fuse section 202 is less than the thickness of the pole section 201 and the pole tab welding section 203, and the structure is simple and easy to form. It can be understood that as an alternative embodiment, a portion of the lower surface of the pole bottom plate 2 can also be set to be recessed upward to form a flat groove running through the width direction of the pole bottom plate 2 on the lower surface of the pole bottom plate 2, or the upper surface and the lower surface of the pole bottom plate 2 are recessed to form two corresponding flat grooves, which can also achieve that the thickness of the fuse section 202 is less than the thickness of the pole section 201 and the pole tab welding section 203. The upper surface refers to the surface of the pole bottom plate 2 connected to the pole body 1 , and the lower surface refers to the surface of the pole bottom plate 2 away from the upper surface.

[0044] In one embodiment, in a cross section perpendicular to the length direction of the pole bottom plate 2, the cross-sectional area of ​​the solid part of the fuse section 202 is S, where 5mm 2 ≤S≤20mm 2 The cross-sectional area of ​​the solid part of the fuse section 202 refers to the area of ​​the intersection of the fuse section 202 and the plane perpendicular to the length direction of the pole bottom plate 2, that is, Figure 4 The area of ​​the shaded part shown in. If S is less than 5mm 2 If the cross-sectional area is too small, the solid part of the fuse section 202 is too small, the structural strength of the pole bottom plate 2 is weak, and the safety is poor; if S is greater than 20mm 2 If the cross-sectional area is too large, the solid part of the fuse section 202 will be too much, the fusing effect will be poor, and the pole bottom plate 2 may not be completely disconnected, affecting the safety of the battery. Therefore, by limiting the cross-sectional area S of the solid part of the fuse section 202 to 5mm 2 -20 mm 2 Taking values ​​within the range can not only ensure the strength of the pole structure, but also ensure that the pole structure can be blown in time with good blowing effect, thereby ensuring the safety of the battery.

[0045] In one embodiment, the length of the pole bottom plate 2 is W, and the length of the pole ear welding section 203 is L, which satisfies: 0.5≤L / W≤0.8. Fig. 9 As shown, the length refers to the length along Fig. 9The dimension in the "length direction" indicated by the arrow in the middle. The pole lug welding section 203 is used for welding with the pole lug. If the ratio of the length of the pole lug welding section 203 to the length of the pole bottom plate 2 is less than 0.5, the proportion of the pole lug welding section 203 on the pole bottom plate 2 is too small, and the area provided by the pole bottom plate 2 for welding with the pole lug is too small, which affects the welding quality of the pole lug, and may cause poor connection between the pole lug and the pole structure, thereby affecting the conductivity between the pole structure and the pole group; if the ratio of the length of the pole lug welding section 203 to the length of the pole bottom plate 2 is greater than 0.8, the proportion of the pole lug welding section 203 on the pole bottom plate 2 is too large, and the length of the pole bottom plate 2 extending out of the area where the pole body 1 is located is too long, which affects the structural strength of the pole bottom plate 2 and is prone to bending and deformation. Therefore, by setting the ratio L / W of the length of the pole tab welding section 203 to the length of the pole base plate 2 to be in the range of 0.5 to 0.8, it is possible to provide sufficient welding area for the pole tab welding to ensure effective welding of the pole tab and the pole structure, and to avoid the length of the pole tab welding section 203 being too long to affect the strength of the pole base plate 2, thereby improving the reliability and stability of the pole structure.

[0046] In one embodiment, the length W of the pole bottom plate 2 is in the range of 40 mm ≤ W ≤ 90 mm. If the length of the pole bottom plate 2 is less than 40 mm, the length of the pole bottom plate 2 is too small, and after removing the pole section 201, the space left for the pole lug welding section 203 is too small, which affects the pole lug welding and may cause poor contact with the pole lug, thereby affecting the battery quality; if the length of the pole bottom plate 2 is greater than 90 mm, the length of the pole bottom plate 2 is too large, and the length extending from the area where the pole body 1 is located is too long, and the strength of the pole bottom plate 2 along the length direction is relatively weak, and it is easy to bend and deform, and it will also increase the weight of the pole bottom plate 2, increase the cost, and affect the energy density of the battery. Therefore, by setting the length of the pole bottom plate 2 to be between 40 mm and 90 mm, it is ensured that there is enough space for welding with the pole lugs and the quality of the pole lug welding is guaranteed, and it is also possible to avoid the pole bottom plate 2 being too long to weaken the structural strength of the pole bottom plate 2, avoid bending and deformation of the pole bottom plate 2, and avoid excessive weight of the pole bottom plate 2, thereby avoiding reducing the energy density of the battery. Preferably, the length W of the pole bottom plate 2 is in the range of 50 mm to 70 mm.

[0047] In one embodiment, the value range of the thickness H of the pole bottom plate 2 is: 1.2mm≤H≤4mm. Figure 1The dimension in the "thickness direction" indicated by the middle arrow, the thickness H of the pole bottom plate 2 refers to the thickness of the pole section 201 and the pole ear welding section 203 on the pole bottom plate 2. If the thickness of the pole bottom plate 2 is less than 1.2 mm, the thickness of the pole bottom plate 2 is too small, the strength of the pole bottom plate 2 is insufficient, it is not easy to form, and it is easy to bend and deform. In addition, since the pole bottom plate 2 and the pole ear are laser welded, if the pole bottom plate 2 is too thin, the heat during the laser welding process will penetrate the pole bottom plate 2, and welding melt will be generated during the welding process with the pole ear; if the thickness of the pole bottom plate 2 is greater than 4 mm, the thickness of the pole bottom plate 2 is too large, the weight increases accordingly, the production cost is high, and the overall energy density of the battery is reduced. Therefore, by setting the thickness H of the pole bottom plate 2 to a value within the range of 1.2mm-4mm, it can be ensured that the pole bottom plate 2 can be formed and has sufficient supporting strength to avoid bending and deformation due to insufficient strength, and at the same time, avoid the generation of welding melt during welding, thereby ensuring the welding quality and the reliability of the connection between the pole structure and the pole ear, and also avoid the increase in cost due to excessive weight, thereby achieving cost reduction and efficiency improvement. Preferably, the thickness H of the pole bottom plate 2 is in the range of 1.5mm-2.5mm.

[0048] In one embodiment, the pole body 1 is welded to the pole bottom plate 2. Specifically, the pole body 1 and the pole bottom plate 2 are two components, and a positioning hole 204 is provided on the pole bottom plate 2. The pole bottom plate 2 is installed in the positioning hole 204, and then the pole body 1 and the pole bottom plate 2 are welded. The production and processing of the pole body 1 and the pole bottom plate 2 are relatively simple, which can reduce the material consumption, and the welding connection method has high reliability. Among them, the positioning hole is a blind hole.

[0049] In addition, in other embodiments, the pole body 1 and the pole bottom plate 2 are integrally formed, which is easy to produce and has good stability.

[0050] In one embodiment, the pole structure further includes: insulating glue 7, the insulating glue 7 includes a surrounding portion 701 and a filling portion 702, the surrounding portion 701 is wrapped around the outer surface of the fuse section 202, and the filling portion 702 is filled in the through groove 212. By coating the outer surface of the fuse section 202 of the pole structure with insulating glue, the protection of the fuse section 202 is achieved, and by setting the filling portion 702 to fill the through groove 212, the filling portion 702 plays a supporting role, which can increase the strength and stability of the pole bottom plate 2, and the slag after the fuse section 202 is melted is wrapped by the insulating glue 7, so as to prevent the slag from falling directly into the battery and causing damage such as a short circuit of the pole group, thereby further improving the safety of the battery.

[0051] In one embodiment, the insulating glue 7 is injection molded on the pole bottom plate 2. Specifically, the insulating glue 7 is injection molded at the fuse section 202 on the pole bottom plate 2. The injection molding method is simple to mold and easy to process, so that the shape of the insulating glue 7 is highly compatible with the fuse section 202 and the cost is low.

[0052] Specifically, the pole structure is a positive pole structure.

[0053] According to an embodiment of the present utility model, on the other hand, a cover plate assembly is also provided, such as Figures 7 to 11 As shown, the cover assembly includes: a cover body 3, an upper plastic 4, a lower plastic 5, the above-mentioned pole structure and a riveting block 6. The cover body 3 is configured with a first through hole 301; the upper plastic 4 is arranged on one side of the cover body 3, and a second through hole 401 corresponding to the first through hole 301 is configured on the upper plastic 4; the lower plastic 5 is arranged on a side of the cover body 3 away from the upper plastic 4, and a third through hole 501 corresponding to the first through hole 301 is configured on the lower plastic 5; the pole bottom plate 2 of the pole structure is located on a side of the lower plastic 5 away from the cover body 3, and the pole body 1 passes through the third through hole 501, the first through hole 301 and the second through hole 401 in sequence; the riveting block 6 is arranged on a side of the upper plastic 4 away from the cover body 3, and the riveting block 6 is riveted to the pole body 1. The cover plate assembly can be directly connected to the pole ear of the pole group through the side of the pole bottom plate 2 of the pole structure away from the cover plate body 3, avoiding the need to weld the connecting plate to the pole and the pole ear separately when using the connecting plate in the traditional way, simplifying the production process and improving production efficiency.

[0054] Specifically, a fourth through hole 601 corresponding to the first through hole 301 is configured on the riveting block 6 , and the riveting block 6 is sleeved on the pole body 1 through the fourth through hole 601 .

[0055] Preferably, the cover plate body 3 is a plain aluminum plate.

[0056] According to an embodiment of the utility model, on the other hand, a battery is also provided, including: a shell, a pole group and the above-mentioned cover assembly. The shell has an open end; the pole group is arranged inside the shell, and the pole group has a pole ear; the cover assembly is arranged at the open end of the shell to close the shell, and the pole structure is welded to the pole ear through the pole ear welding section 203. The pole group is located on the side of the pole base plate 2 of the pole structure away from the pole body 1. By welding the pole structure and the pole ear in the cover assembly, the electrical connection between the pole structure and the pole group is achieved, the use of connectors is eliminated, and the situation that the distance required for the bending of the connecting piece is large, resulting in the connecting piece occupying too much internal space of the battery, thereby achieving as little internal space of the battery as possible, which is beneficial to increase the battery capacity and reduce costs.

[0057] In one embodiment, the battery further includes: an insulating sheet 8, which is disposed on a side of the pole bottom plate 2 away from the pole body 1 and corresponds to the pole segment 201 on the pole bottom plate 2. By disposing the insulating sheet 8 on a side of the pole segment 201 away from the pole body 1, the insulating sheet 8 is located between the pole segment 201 and the pole group, thereby ensuring insulation between the pole segment 201 and the pole group, and further improving the safety of the battery.

[0058] In one embodiment, the battery is a lithium-ion power battery.

[0059] In this embodiment, the cover plate assembly adopts a pole structure with a fuse section 202, that is, the fuse structure is integrated on the pole structure, which eliminates the use of traditional connecting plates, reduces the number of parts, and reduces the cost of structural parts; eliminates the factor of the large distance required for the bending of the connecting plates, minimizes the internal space of the battery, and has a great advantage in increasing the battery capacity and reducing costs; simplifies the production process and improves production efficiency.

[0060] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A pole structure, characterized in that: include: pole body; A pole base plate comprises a pole section, a fuse section and a pole lug welding section which are sequentially connected along its length direction, one side of the pole section is fixedly connected to one end of the pole body, the pole lug welding section is suitable for welding to the pole lug of a pole group, and the pole lug is located on a side of the pole base plate away from the pole body, the thickness of the fuse section is less than the thickness of the pole section and the pole lug welding section, and a through groove is constructed on the fuse section, and the through groove passes through the fuse section along the thickness direction of the pole base plate.

2. The pole structure according to claim 1, characterized in that: In the cross section perpendicular to the length direction of the pole bottom plate, the cross-sectional area of ​​the solid part of the fuse section is S, where 5mm 2 ≤S≤20mm 2 .

3. The pole structure according to claim 1, characterized in that: The length of the pole bottom plate is W, and the length of the pole ear welding section is L, which satisfies: 0.5≤L / W≤0.

8.

4. The pole structure according to claim 3, characterized in that: The length W of the pole bottom plate has a value range of: 40 mm ≤ W ≤ 90 mm; And / or, the thickness H of the pole bottom plate has a value range of: 1.2 mm ≤ H ≤ 4 mm.

5. The pole structure according to claim 1, characterized in that: The pole body and the pole bottom plate are welded or integrally formed.

6. The pole structure according to any one of claims 1 to 5, characterized in that: The pole structure further includes: insulating glue, the insulating glue including a surrounding portion and a filling portion, the surrounding portion wraps around the outer surface of the fuse section, and the filling portion is filled in the through groove.

7. The pole structure according to claim 6, characterized in that: The insulating glue is injection-molded on the pole bottom plate.

8. A cover plate assembly, characterized in that: include: The cover plate body is configured with a first through hole; An upper plastic, disposed on one side of the cover body, and having a second through hole corresponding to the first through hole; A lower plastic is arranged on a side of the cover body away from the upper plastic, and a third through hole corresponding to the first through hole is formed on the lower plastic; The pole structure according to any one of claims 1 to 7, wherein the pole bottom plate of the pole structure is located on a side of the lower plastic away from the cover body, and the pole body passes through the third through hole, the first through hole and the second through hole in sequence; A riveting block is arranged on a side of the upper plastic away from the cover body, and the riveting block is riveted to the pole body.

9. A battery, characterized in that: include: a housing having an open end; A pole group is arranged inside the shell, and the pole group has pole ears; The cover plate assembly described in claim 8 is arranged at the open end of the shell to close the shell, and the pole structure is welded to the pole lug through the pole lug welding section.

10. The battery according to claim 9, characterized in that The battery further comprises: an insulating sheet, which is arranged on a side of the pole bottom plate away from the pole body and corresponds to the pole segment on the pole bottom plate.

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