Pole, cell cover plate and battery

Abstract

The application relates to a pole, a battery core cover plate and a battery. A plate body part is defined with a length direction, a width direction and a thickness direction, the plate body part has a first end face and a second end face opposite in the thickness direction, the plate body part is provided with a misfit part in the middle of the length direction, the misfit part comprises a groove extending in the width direction formed on the second end face and a matching surface extending in the width direction and raised on the first end face; a pole body part in a columnar structure extends in the thickness direction in the middle of the matching surface. The position of the pole body part is arranged as a bent plate, and the misfit part is arranged at the corresponding position of the pole body part, so that the bent plate can support a sealing ring and reduce the weight, the overall structure is simple, the manufacturing and installation are convenient, and the cost is low.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of batteries, in particular to a pole, a battery cell cover plate and a battery. BACKGROUND

[0002] A blade battery, full name blade-shaped lithium iron phosphate battery, is a special designed lithium ion battery, which is long and thin in shape and can be inserted into a battery pack like a "blade", hence the name, and uses lithium iron phosphate as a positive electrode material.

[0003] With the increasing maturity of lithium ion battery technology, lithium ion batteries are widely used as power batteries in electric vehicles and energy storage fields, and the use performance and safety of lithium ion batteries are increasingly required.

[0004] The lithium battery cover plate is a key accessory in the lithium ion battery, which functions to weld with the shell to form a sealed cavity, lead out the positive and negative poles of the pole group, and serve as an assembly carrier.

[0005] The traditional cover plate riveting method in the prior art is composed of a riveting block, a first plastic part, a pole, an aluminum sheet, a second plastic part, a sealing ring and the like. The pole is usually cylindrical in structure. In combination with the lightweight and large current capacity requirements of the structural part, the blade cover plate is changed from a cylindrical pole to a runway structure to meet the large current capacity, and a runway-shaped pole cover plate is designed. Since the current cover plate pole needs to withstand a large current, the thickness of the pole bottom plate is relatively thick, and the bottom plate is a horizontal straight plate. The negative pole welding plate is currently made of copper material. The copper tab and the pole bottom plate welding require a very high welding temperature, and the heat is likely to cause the sealing ring to fail, thereby causing the cover plate to leak. SUMMARY

[0006] Therefore, it is necessary to provide a pole, a battery cell cover plate and a battery to solve the problems of cover plate pole bottom plate and tab welding high temperature leading to sealing ring failure and lightweight, so as to greatly change the structure design of the pole, make the overall structure lightweight, greatly reduce the possibility of sealing ring failure, greatly improve the product reliability, greatly improve the performance of the battery, and meet the use requirements.

[0007] The technical scheme adopted by the application is as follows:

[0008] The first aspect of the application provides a pole, comprising:

[0009] The plate body part has a first end surface and a second end surface opposite in the thickness direction, and a misfit part is arranged at the middle of the plate body part in the length direction, the misfit part including a groove extending in the width direction formed on the second end surface and a matching surface extending in the width direction and raised on the first end surface; the groove extends in the whole width direction of the second end surface;

[0010] The column part extends in the thickness direction at the middle of the matching surface.

[0011] As a further improvement of the above technical solution:

[0012] The part of the plate body part on both sides of the misfit part in the length direction is a tab welding area, the thickness of the tab welding area in the thickness direction is h, the width of the tab welding area in the width direction is b, and the total flow area of the tab welding area is:

[0013] S1=2*h*b

[0014] The projection area of the column part on a plane perpendicular to the thickness direction is S2.

[0015] In the case that the column part meets the overcurrent capacity of the battery cell, 0.9≤S1 / S2≤1.2.

[0016] The projection of the column part on a plane perpendicular to the thickness direction is a racetrack type, and the projection area is:

[0017] S2=πr2+2*r*d

[0018] Wherein:

[0019] r is the radius of the semicircle at both ends of the racetrack type;

[0020] d is the length of the rectangle between the two semicircles of the racetrack type.

[0021] The groove depth of the groove in the thickness direction is h1, and h1

[0022] The groove is a blind groove.

[0023] The column part and the plate body part adopt an integrated structure.

[0024] The second aspect of the present application provides a battery cell cover plate, comprising:

[0025] The cover plate body is provided with a mounting hole;

[0026] According to the above pole, wherein the column part penetrates through the mounting hole, the plate body part and the cover plate body have consistent length direction, width direction and thickness direction, and the plate body part is located on one side of the cover plate body in the thickness direction;

[0027] riveting block riveted with the column part on the other side of the thickness direction of the cover plate body;

[0028] the first plastic part is arranged around the column part and extends on the surface of the cover plate body close to the plate body part, and the first plastic part is at least partially arranged between the cover plate body and the plate body part;

[0029] the second plastic part is arranged around the column part and extends on the surface of the cover plate body close to the riveting block, and the second plastic part is at least partially arranged between the cover plate body and the riveting block;

[0030] the sealing ring is arranged around the column part and at least partially arranged between the annular gap between the cover plate body and the column part.

[0031] As a further improvement of the above technical solution:

[0032] the first plastic part is arranged with a recess on the side close to the plate body part, and the plate body part is embedded in the recess.

[0033] The third aspect of the present application provides a battery, comprising:

[0034] a battery shell having a receiving cavity and an open opening;

[0035] a cell pole group arranged in the receiving cavity;

[0036] and the cell cover plate according to the above is arranged at the opening to close the battery shell; wherein the pole column is electrically connected with the cell pole group.

[0037] As a further improvement of the above technical solution:

[0038] the battery shell has two openings located at opposite ends of the battery shell.

[0039] The beneficial effects of the present application are as follows:

[0040] The present application provides a brand new pole column structure, which is arranged as a bent plate at the position of the pole plate body part, and a staggered structure part is arranged at the corresponding position of the column part, which can support the sealing ring and also reduce the weight, and the overall structure is simple, easy to manufacture and install, and low in cost.

[0041] The present application designs a staggered structure part, thereby forming a groove at the bottom surface position of the pole plate body part, so that the pole lug is welded on both sides of the staggered structure part during the welding process of the pole lug, which not only increases the heat transfer path, but also does not directly affect the sealing ring, ensures that the sealing ring does not fail, greatly improves the product reliability, greatly improves the performance of the battery, and meets the use requirements.

[0042] Compared with the traditional pole bottom plate, the thickness of the pole bottom plate is relatively thick, and the bottom plate is a horizontal straight plate. In the welding process, the heat is relatively concentrated in the middle position, and the heat in the middle position is greatly increased. After the structure of the application is optimized, the failure of the sealing ring is avoided, and the thickness of the pole bottom plate can be reduced, and the weight is reduced.

[0043] The parameters of the pole are set in the application, which ensures the reliability of the pole welding and improves the performance of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a structure diagram of the pole in an embodiment of the application.

[0045] Figure 2 It is a front view of the pole in an embodiment of the application.

[0046] Figure 3 It is a top view of the pole in an embodiment of the application.

[0047] Figure 4 It is a bottom view of the pole in an embodiment of the application.

[0048] Figure 5 It is an installation diagram of the pole and the sealing ring in an embodiment of the application.

[0049] Figure 6 It is an explosion diagram of the cell cover plate in an embodiment of the application.

[0050] REFERENCE SIGNS:

[0051] 100, pole;

[0052] 110, pole body part;

[0053] 120, plate body part;

[0054] 121, matching surface;

[0055] 122, misfit part;

[0056] 130, groove;

[0057] 131, cavity;

[0058] 200, sealing ring;

[0059] 300, first plastic part;

[0060] 400, cover plate body;

[0061] 500, second plastic part;

[0062] 600, riveting block. DETAILED DESCRIPTION

[0063] In order to make the above objectives, features and advantages of the present application more clear and comprehensible, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different ways beyond the specific embodiments described herein and by one of ordinary skill in the art without departing from the spirit and scope of the present application, and it is therefore intended that all such variations be considered as falling within the scope of the present application. Accordingly, the present application should not be limited by the following description and examples.

[0064] In the description of the present application, it should be understood that, if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0065] In addition, if the terms "first", "second" appear, these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implying the number of technical features indicated. Therefore, the features limited by "first", "second" can include at least one of the features explicitly or implicitly. In the description of the present application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0066] In the present application, unless otherwise specifically defined and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0067] In the present application, unless specifically stated and limited otherwise, if there is a description of a first feature "on" or "under" a second feature, it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can mean that the first feature is directly above or obliquely above the second feature, or only means that the first feature is horizontally higher than the second feature. The first feature "under", "below" and "underneath" the second feature can mean that the first feature is directly below or obliquely below the second feature, or only means that the first feature is horizontally lower than the second feature.

[0068] It should be noted that if an element is referred to as being "fixed to" or "set to" another element, it can be directly on the other element or there can be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not mean the only implementation.

[0069] As shown in Figure 1 、 Figure 2 、 Figure 3 and Figure 4 , the pole of the embodiment comprises:

[0070] The plate body part 120 defines a length direction, a width direction and a thickness direction based on the plate body part 120, the plate body part 120 has a first end face F1 and a second end face F2 opposite in the thickness direction, and the plate body part 120 is provided with a misfit part 122 in the middle of the length direction, the misfit part 122 includes a groove 130 extending in the width direction formed on the second end face F2, and a matching surface 121 extending in the width direction and rising on the first end face F1.

[0071] The column part 110 is in a columnar structure, and the column part 110 extends in the thickness direction in the middle of the matching surface 121.

[0072] The part of the plate body part 120 on both sides of the misfit part 122 in the length direction is a tab welding area, the thickness of the tab welding area in the thickness direction is h, the width of the tab welding area in the width direction is b, and the total flow area of the tab welding area is:

[0073] S1=2*h*b

[0074] The projection of the column part 110 on the plane perpendicular to the thickness direction is in a racetrack shape, and the projection area of the column part 110 on the plane perpendicular to the thickness direction is S2.

[0075] S2=πr 2+ 2 * r * d

[0076] wherein:

[0077] r is the radius of the semicircle at both ends of the runway shape;

[0078] d is the length of the rectangle between the two semicircles in the runway shape.

[0079] In the case where the column part 110 meets the overcurrent capacity of the battery cell, 0.9≤S1 / S2≤1.2.

[0080] If the ratio of S1 to S2 is less than 0.9, the temperature of the plate part 120 is greatly increased, and if the ratio of S1 to S2 is greater than 1.2, the plate part 120 is designed with a surplus, and the structural member is overweight.

[0081] Case 1:

[0082] When h=1.5mm, r=2.2mm, d=4.5mm; S2 is a certain value, take different b values, test whether the highest temperature of the pole column of the plate of different widths under the same working condition meets the application requirement (≤55℃):

[0083] Table 1

[0084]

[0085] Case 2:

[0086] When h=2mm, r=2.5mm, d=5; S2 is a certain value, take different b values, test the highest temperature of the pole column of the plate of different widths under the same working condition:

[0087] Table 2

[0088]

[0089] Case 3:

[0090] When h=1.5mm, r=2mm, d=4; S2 is a certain value, take different b values, test the highest temperature of the pole column of the plate of different widths under the same working condition:

[0091] Table 3

[0092]

[0093] The above cases show that when S1 / S2<0.9, the overcurrent area of the pole plate is insufficient, the temperature of the pole column is high, and it does not meet the application requirement; when S1 / S2>1.2, the temperature of the pole column does not change basically with the increase of S1, and at this time the overcurrent area of the pole plate is designed with a surplus.

[0094] The groove 130 has a groove depth h1 in the thickness direction, h1<h, so as to ensure the strength of the plate part 120.

[0095] The groove 130 and the plane where the second end surface F2 are located form a cavity 131, that is, the sealing ring 200 at the fitting surface 121 corresponding to the cavity 131 can greatly reduce the heat in the welding process, ensure that the sealing ring 200 does not fail, greatly improve the reliability of the product, and greatly improve the performance of the battery, meeting the use requirements.

[0096] The groove 130 is a blind groove, which can ensure the strength of the pole 100 while meeting the heat transfer requirements and protecting the sealing ring 200.

[0097] The groove 130 extends in the entire width direction of the second end surface F2.

[0098] The pole 100 (i.e., the column body 110 and the plate body 120) adopts an integrated structure, which is compact in structure, easy to manufacture, and low in cost.

[0099] The pole 100 is simple in overall structure, easy to manufacture, and reliable in work, effectively solving the problem of heat transfer.

[0100] In the position of the plate body 120 of the pole 100, a bent plate is arranged, and a staggered structure 122 is arranged at the corresponding position of the column body 110, which can support the sealing ring 200 while reducing the weight, and is simple in overall structure, easy to manufacture and install, and low in cost. The most critical is that in the welding process, the entire bottom surface of the plate body 120 is not directly welded, but welded on both sides of the plate body 120, which not only increases the heat transfer path, but also does not directly affect the sealing ring 200, ensuring that the sealing ring 200 does not fail, greatly improving the reliability of the product while greatly improving the performance of the battery, meeting the use requirements.

[0101] Compared with the traditional pole bottom plate, the thickness of the pole bottom plate is relatively thick, and the bottom plate is a horizontal straight plate. In the welding process, the heat is relatively concentrated in the middle position, and the heat in the middle position is greatly increased. It is possible that the optimized structure of the application avoids the failure of the sealing ring 200, and also reduces the thickness of the pole bottom plate and the weight.

[0102] The parameters of the pole in the embodiment are set to ensure the reliability of the pole welding and improve the performance of the battery.

[0103] As shown in Figure 5 and Figure 6 The cell cover plate of the embodiment comprises:

[0104] The cover plate body 400 is provided with a mounting hole.

[0105] According to the pole 100 of the first embodiment, the column part 110 penetrates the mounting hole, the plate part 120 has the same length direction, width direction and thickness direction as the cover plate body 400, and the plate part 120 is located on one side of the thickness direction of the cover plate body 400;

[0106] The riveting block 600 is riveted with the column part 110 on the other side of the thickness direction of the cover plate body 400;

[0107] The first plastic part 300 is arranged around the column part 110 and extends on the surface of the cover plate body 400 close to the plate part 120, and the first plastic part 300 is at least partially between the cover plate body 400 and the plate part 120;

[0108] The second plastic part 500 is arranged around the column part 110 and extends on the surface of the cover plate body 400 close to the riveting block 600, and the second plastic part 500 is at least partially between the cover plate body 400 and the riveting block 600;

[0109] The sealing ring 200 is arranged around the column part 110 and at least partially between the cover plate body 400 and the annular gap of the column part 110.

[0110] The first plastic part 300 is arranged with a recess on the side close to the plate part 120, and the plate part 120 is embedded in the recess.

[0111] The battery of the embodiment includes:

[0112] The battery shell has a receiving cavity and an open opening;

[0113] The cell pole group is arranged in the receiving cavity;

[0114] The cell cover plate of the second embodiment is arranged in the opening to close the battery shell; wherein the pole 100 is electrically connected with the cell pole group.

[0115] The battery shell has two openings located at opposite ends of the battery shell.

[0116] The technical features of the above embodiments can be combined arbitrarily. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, but as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present disclosure.

[0117] The above embodiments only express several implementation ways of the present application, and the description is relatively specific and detailed, but it should not be understood as a limitation to the patent scope of the application. It should be pointed out that for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, which all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A pole, characterized in that Comprising: a plate body part, based on which a length direction, a width direction and a thickness direction are defined, the plate body part having a first end face and a second end face opposite in the thickness direction, the plate body part being provided with a misfit part in the middle of the length direction, the misfit part including a groove extending in the width direction formed in the second end face and a matching face extending in the width direction and raised in the first end face; the groove extending in the whole width direction of the second end face; a column body part in a columnar structure, the column body part extending in the thickness direction in the middle of the matching face; the portions of the plate body part on both sides of the misfit part in the length direction being tab welding areas, the thickness of the tab welding areas in the thickness direction being h, the width of the tab welding areas in the width direction being b, the total flow area of the tab welding areas being: S1=2*h*b the projection area of the column body part on a plane perpendicular to the thickness direction being S2; in the case where the column body part meets the overcurrent capacity of the battery cell, 0.9≤S1 / S2≤1.

2.

2. The pole according to claim 1, characterized in that the projection of the column body part on a plane perpendicular to the thickness direction being a racetrack type, the projection area being: S2 = πr 2 + 2 * r * d wherein: r is the radius of the semicircle at both ends of the racetrack type; d is the length of the rectangle between the two semicircles of the racetrack type.

3. The pole as claimed in claim 1, characterized in that the groove depth of the groove in the thickness direction being h1, h1 4. The pole according to claim 1, wherein the groove being a blind groove.

5. The pole as claimed in claim 1, wherein the column body part and the plate body part adopting an integrated structure.

6. An electrode cover plate, characterized by, Comprising: a cover plate body having a mounting hole; the tab post according to any one of claims 1-5, wherein the column body part penetrates through the mounting hole, the plate body part has a consistent length direction, width direction and thickness direction with the cover plate body, and the plate body part is located on one side of the cover plate body in the thickness direction; a riveting block riveted to the column body part on the other side of the cover plate body in the thickness direction; a first plastic part arranged around the column body part and extending on the surface of the cover plate body close to the plate body part, and the first plastic part is at least partially interposed between the cover plate body and the plate body part; a second plastic part arranged around the column body part and extending on the surface of the cover plate body close to the riveting block, and the second plastic part is at least partially interposed between the cover plate body and the riveting block; a sealing ring arranged around the column body part and at least partially arranged in the annular gap between the cover plate body and the column body part.

7. The battery cell cover plate according to claim 6, characterized in that, a side of the first plastic part close to the plate body part is provided with a sunken groove, and the plate body part is embedded in the sunken groove.

8. A battery, characterized by Comprising: a battery shell having a receiving cavity and an open opening; a battery cell pole group placed in the receiving cavity; and the battery cell cover plate according to any one of claims 6-7 arranged at the opening to close the battery shell; wherein the tab post is electrically connected with the battery cell pole group.

9. The battery of claim 8, wherein, The battery shell has two openings located at opposite ends of the battery shell.

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