Current collection structure, cover plate assembly, battery and battery pack

Abstract

The utility model provides a current collecting structure, a cover plate assembly, a battery and a battery pack, and relates to the technical field of batteries. According to the current collecting structure provided by the invention, the switching part can be bent in the form, so that the part of the first connecting part and the part of the second connecting part are respectively overlapped on two opposite sides of the bent switching main body. When the current collecting structure is electrically connected with a tab of a naked battery cell and an external structure, the current collecting structure can take the first folding part and the second folding part as folding execution positions and fold the switching main body, so that the folded form of the current collecting structure is relatively standardized, and the situation that a current collecting piece in the prior art is randomly folded into different forms, so that the switching main body is not damaged is avoided. Therefore, when the naked battery core connected with the current collecting piece enters the shell of the battery, the randomly folded current collecting piece interferes with the opening of the shell and is not easy to standardize.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting structure, a cover plate assembly, a battery and a battery pack. Background Art

[0002] In the prior art, a current collector is usually used in a lithium battery to connect with the tabs of a bare cell. The current collector and the structure and tabs of the battery electrodes are usually welded. In order to ensure the progress of the process, the current collector is usually long. After being welded with the structure and tabs of the battery electrodes, the bare cell needs to be placed in the battery shell. The current collector needs to be folded before that. However, the folding shape of the existing current collector is not fixed, and it is easy to interfere with the shell when entering the shell. After the interference occurs, since the shape of the folded current collector is not fixed, the method of adjusting the position of the current collector is usually not fixed, which increases the difficulty and time of the bare cell entering the shell, and may also cause the connection between the current collector and the bare cell and the electrode structure to fail. Utility Model Content

[0003] In view of this, the present application provides a current collecting structure, a cover plate assembly, a battery and a battery pack, the purpose of which is to solve the above technical problems to a certain extent.

[0004] In a first aspect, the present application provides a current collecting structure, the current collecting structure being used to be electrically connected to a bare battery cell, the bare battery cell comprising a battery cell body and a tab connected to the battery cell body, the current collecting structure comprising:

[0005] A first connection portion, the first connection portion is used to be electrically connected to the tab;

[0006] a second connection portion, the second connection portion being used to electrically connect to an external structure, the first connection portion and the second connection portion being spaced apart in a first direction;

[0007] A transition portion, the transition portion comprising a transition body, a first folding portion and a second folding portion, the first folding portion and the second folding portion are respectively connected to two edges of the transition body in the first direction, the first folding portion is connected to the first connecting portion, and the second folding portion is connected to the second connecting portion;

[0008] The first folding portion, the second folding portion and the adapter body can all be bent so that a portion of the first connecting portion and a portion of the second connecting portion are respectively overlapped on two opposite sides of the bent adapter body.

[0009] Preferably, a dimension of the transition portion in a second direction perpendicular to the first direction is larger than a dimension of the first folding portion in the second direction, and a dimension of the transition portion in the second direction is larger than a dimension of the second folding portion in the second direction.

[0010] Preferably, the first connecting portion has at least one arc edge matching the bare battery cell, and when observed along the axial direction of the arc edge, the folded current collecting structure does not exceed the circle where the arc edge is located.

[0011] Preferably, the first connecting portion has at least one arc edge matching the bare battery cell, and the first connecting portion also has a first edge connected to the first folding portion, and the distance from the first edge to the center of the arc edge is L1;

[0012] The second connecting portion has a second side portion connected to the second folding portion, the second connecting portion has a step portion extending along the second direction, and a distance between the second side portion and the step portion is L2;

[0013] Wherein, the dimension of the adapter body between the first folding portion and the second folding portion is L, and L satisfies L=L1+L2;

[0014] The cover plate body has a center, the step portion passes through the center of the cover plate body and is bisected by the center of the cover plate body, and a line connecting the center of the arc edge and the center of the cover plate body is perpendicular to the step portion.

[0015] Preferably, a dimension of the first folded portion in the first direction is 0.1-10 mm, and / or a dimension of the second folded portion in the first direction is 0.1-10 mm.

[0016] Preferably, the first connecting portion has a notch portion located on a side opposite to the side where the first folding portion is located, and the notch portion is used to avoid the explosion-proof structure of the battery where the bare cell is located;

[0017] Wherein, the first connecting portion includes two arc edges opposite to each other, and the notch portion is sandwiched between the two arc edges.

[0018] In a second aspect, the present application provides a cover plate assembly, which includes the current collecting structure as described above.

[0019] In a third aspect, the present application provides a cap assembly, the cap assembly being used to be connected to a battery housing, the housing having an opening for a bare cell of the battery to enter the interior of the housing, the bare cell having a tab, the cap assembly comprising:

[0020] Cover plate body;

[0021] A current collecting structure, the current collecting structure comprising a first connecting portion, a second connecting portion and a transition portion, the first connecting portion being used to be electrically connected to the tab, the second connecting portion being electrically connected to the cover plate body, and the transition portion connecting the first connecting portion and the second connecting portion;

[0022] Wherein, the adapter part is arranged at an angle relative to the first connection part and the second connection part, and the adapter part itself forms at least two parts arranged at an angle, so that the part of the first connection part and the part of the second connection part are respectively overlapped on two opposite sides of the adapter part.

[0023] Preferably, the cover plate assembly further comprises:

[0024] an insulating member, the insulating member being connected to a side of the cover plate body electrically connected to the current collecting structure;

[0025] Wherein, the insulating component has a through hole, and the second connecting portion is arranged through the through hole to be electrically connected to the cover plate body;

[0026] The insulating component has a first recessed portion disposed on a side facing away from the cover plate body, and the portion of the second connecting portion and the transition portion are located in the first recessed portion.

[0027] Preferably, the insulating member further comprises a first limiting member and a second limiting member disposed in the first recess;

[0028] The second connection portion has a stepped portion extending along an edge of the through hole close to the second connection portion, and the first limiting member and the second limiting member are respectively abutted against two sides of the second connection portion in an extending direction of the stepped portion.

[0029] Preferably, the insulating component further has a second recess, the first recess is located in the second recess, and the first connecting portion is located in the first recess.

[0030] Preferably, the insulating component further has a liquid injection hole and an explosion-proof valve pressure relief hole which are arranged in the first recess and penetrate the insulating component;

[0031] The first connecting portion has a notch portion, the position of the notch portion corresponds to the position of the explosion-proof valve pressure relief hole, so as to avoid the explosion-proof valve pressure relief hole;

[0032] Wherein, the first connecting portion includes two arc edges opposite to each other, and the notch portion is sandwiched between the two arc edges.

[0033] Preferably, the adapter portion includes an adapter body, a first folding portion and a second folding portion, the first folding portion and the second folding portion are respectively connected to two opposite sides of the adapter body, the first folding portion is connected to the first connecting portion, and the second folding portion is connected to the second connecting portion;

[0034] The first folding portion, the second folding portion and the adapter body are formed into two parts at an angle, so that the part of the first connecting portion and the part of the second connecting portion are respectively overlapped on two opposite sides of the adapter body.

[0035] Preferably, the first connecting portion has at least one arc edge matching the bare cell, and the first connecting portion also has a first edge connected to the first folding portion, and the distance from the first edge to the center of the arc edge is L1;

[0036] The second connecting portion has a second side portion connected to the second folding portion, the second connecting portion has a step portion parallel to the second side portion, and the distance between the second side portion and the step portion is L2;

[0037] The dimension of the adapter body in the first direction is L, and L satisfies L=L1+L2.

[0038] Preferably, the distance that the first folded portion extends between the adapter body and the first connecting portion is 0.1-10 mm, and / or the distance that the second folded portion extends between the adapter body and the second connecting portion is 0.1-10 mm;

[0039] The lengths of the first folded portion and the second folded portion are respectively smaller than the two side portions.

[0040] Preferably, the cover plate body is a circular structure and has a first axis, the first connecting portion has at least one arc edge, the arc edge has a second axis, and the first axis and the second axis coincide with each other.

[0041] In a third aspect, the present application provides a battery, comprising the cover plate assembly as described above.

[0042] In a fourth aspect, the present application provides a battery pack, comprising the battery as described above.

[0043] According to the current collecting structure provided by the present application, since the adapter part can be bent in the above form, the part of the first connecting part and the part of the second connecting part are respectively overlapped on the two opposite sides of the adapter body after bending. When the current collecting structure is used to electrically connect the pole ear and the external structure of the bare battery cell, the current collecting structure can use the first folding part and the second folding part as the execution position of the folding, and fold the adapter body accordingly, which makes the shape of the current collecting structure after folding relatively standardized, avoiding the current collecting parts randomly folding into different shapes like the current collecting parts in the prior art, resulting in the bare battery cell connected to the current collecting parts entering the battery shell, and the randomly folded current collecting parts and the opening of the shell interfering, which is not easy to be standardized.

[0044] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0046] Figure 1 A schematic diagram showing a plan view of a current collecting structure provided according to an embodiment of the present application;

[0047] Figure 2 A schematic diagram showing another plan view of a current collecting structure provided according to an embodiment of the present application;

[0048] Figure 3 A schematic diagram showing a plan view of a cover plate assembly provided according to an embodiment of the present application;

[0049] Figure 4 A schematic diagram showing another plan view of a cover plate assembly provided according to an embodiment of the present application;

[0050] Figure 5 A schematic diagram of an exploded view of a cover plate assembly provided according to an embodiment of the present application is shown.

[0051] Figure 6 A schematic diagram showing a plan view of another cover plate assembly provided according to an embodiment of the present application;

[0052] Figure 7 A schematic diagram showing a plan view of an insulating component of a cover plate assembly provided according to an embodiment of the present application.

[0053] Reference numerals:

[0054] 100 - Manifold structure; 110 - First connecting part; 111 - Arc edge part; 112 - Notch part; 113 - First edge part; 120 - Second connecting part; 121 - Step part; 122 - Second edge part; 130 - Adapter part; 131 - Adapter body; 132 - First folding part; 133 - Second folding part.

[0055] 200 - Cover plate body; 300 - Insulating member; 310 - First concave part; 320 - Second concave part; 330 - First limiting member; 340 - Second limiting member; 350 - Liquid injection hole; 360 - Explosion - proof valve pressure relief hole; 370 - Through - hole; 400 - Explosion - proof valve protection piece; 500 - Explosion - proof valve; 610 - Sealing aluminum nail; 620 - Sealing rubber plug;

[0056] 700 - First direction; 800 - Second direction. Detailed implementation manners

[0057] Next, the technical solutions of the present application will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0058] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0060] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0061] According to a first aspect of an embodiment of the present application, a current collecting structure 100 is provided. Figures 1 to 6 The structure and working principle of the current collecting structure 100 are described in detail.

[0062] According to the current collecting structure 100 provided in the embodiment of the present application, the current collecting structure 100 is used to be electrically connected to a bare battery cell. The bare battery cell includes a battery cell body and a tab connected to the battery cell body. The current collecting structure 100 includes a first connecting portion 110 , a second connecting portion 120 and a transition portion 130 .

[0063] In the embodiment, the first connection portion 110 is used to electrically connect to the tab, and the second connection portion 120 is used to electrically connect to an external structure. The first connection portion 110 and the second connection portion 120 are spaced apart in the first direction 700 .

[0064] In an embodiment, the adapter portion 130 includes a adapter body 131, a first folding portion 132 and a second folding portion 133, the first folding portion 132 and the second folding portion 133 are respectively connected to two sides of the adapter body 131 in the first direction 700, the first folding portion 132 is connected to the first connection portion 110, and the second folding portion 133 is connected to the second connection portion 120.

[0065] In the embodiment, the first folding portion 132 , the second folding portion 133 and the adapter body 131 can be bent so that a portion of the first connection portion 110 and a portion of the second connection portion 120 are respectively overlapped on two opposite sides of the bent adapter body 131 .

[0066] Thus, according to the current collecting structure 100 provided in the embodiment of the present application, since the adapter part 130 can be bent in the above form, the part of the first connection part 110 and the part of the second connection part 120 are respectively overlapped on the opposite sides of the adapter body 131 after bending. When the current collecting structure 100 is used to electrically connect the pole ear and the external structure of the bare battery cell, the current collecting structure 100 can use the first folding part 132 and the second folding part 133 as the execution position of the folding, and fold the adapter body 131 accordingly, which makes the shape of the current collecting structure 100 after folding relatively standardized, avoiding the current collecting parts randomly folding into different shapes like the current collecting parts in the prior art, resulting in the bare battery cell connected to the current collecting parts interfering with the opening of the shell when entering the shell of the battery, and the situation that it is not easy to standardize occurs.

[0067] In an embodiment, as mentioned in the above description, since the folding positions of both sides of the adapter portion 130 in the first direction 700 have been determined by using the first folding portion 132 and the second folding portion 133, the overall folded posture of the adapter portion 130 is easy to determine. In this way, on the one hand, the posture of the folded current collector structure 100 in space makes it not easy for the current collector structure 100 to interfere with the opening of the battery housing. On the other hand, even if interference may occur, since the overall posture of the current collector structure 100 is relatively determined, this interference can be eliminated by means such as pushing the current collector structure 100 along a unified direction parallel to the opening against the pre-assembly of the bare battery cell.

[0068] For these two reasons above, the current collector structure 100 provided according to the embodiment of the present application effectively improves the efficiency of assembling the pre-assembly of the current collector structure 100 and the bare battery cell with the housing, that is, the so-called "battery cell into the housing" in the general sense. At the same time, it can also avoid damage to the current collector structure 100, the bare battery cell and the housing due to interference, and avoid the failure of the mechanical connection and electrical connection between the pre-assembly of the current collector structure 100 and the bare battery cell.

[0069] In an embodiment, by way of example, the current collector structure 100 can be formed of a metal material such as aluminum or copper. In some other examples, the current collector structure 100 can be formed of a composite material of copper and aluminum, that is, one side of the current collector structure 100 as a whole is aluminum and the other side is copper. The part on the copper side (corresponding to the first connection portion 110) is used for electrically connecting with the tab, and the part on the aluminum side (corresponding to the second connection portion 120) is electrically connected with a cover body 200 of a subsequent battery cover assembly, for example. However, in some other examples, although not shown, the current collector structure 100 can also be electrically connected to the pole column of a battery having a pole column.

[0070] According to the current collector structure 100 provided by the embodiment of the present application, in an embodiment, the first connection portion 110 can achieve mechanical connection and electrical connection with the tab by means such as laser welding. The second connection portion 120 and an external component, such as the cover body 200 mentioned in the above description, can also be electrically connected by laser welding. In an embodiment, since the current collector structure 100 extends along the first defense line as a whole, before folding, the first connection portion 110 of the current collector structure 100 can be located outside the cover body 200, so as to cause the first connection portion 110 to cover above the bare battery cell, and laser can be applied from the side of the first connection portion 110 facing away from the bare battery cell, that is, the upper side of the first connection portion 110, to heat the first connection portion 110 so that the first connection portion 110 is welded to the tab.

[0071] Similarly, the welding method of the second connection part 120 and the cover body 200 is the same, that is, laser is applied from the side of the cover body 200 facing away from the second connection part 120, that is, the upper side of the cover body 200, to complete the welding of the cover body 200 and the second connection part 120.

[0072] In an embodiment, the current collecting structure 100 does not affect its welding with the pole ear and the cover plate body 200. After welding, the current collecting structure 100 can be folded in the above form to facilitate the bare cell to enter the shell. In an embodiment, as an example, the bare cell can be a wound bare cell, that is, a roll core. The roll core can be in the form of pole ears on both sides, that is, the positive pole ear and the negative pole ear are respectively output from the two sides of the axial direction of the roll core, and the current collecting structure 100 can be set to two corresponding to the roll core, respectively providing positive current collecting function and negative current collecting function.

[0073] According to the current collecting structure 100 provided in the embodiment of the present application, in the embodiment, the first connecting part 110, the second connecting part 120 and the transition part 130 in the current collecting structure 100 can be an integrally formed structure obtained by stamping and blanking the same metal sheet, thereby increasing the overall strength of the current collecting structure 100.

[0074] According to the current collecting structure 100 provided in the embodiment of the present application, the size of the transition part 130 in the second direction 800 perpendicular to the first direction 700 can be larger than the size of the first folding part 132 in the second direction 800, and the size of the transition part 130 in the second direction 800 can be larger than the size of the second folding part 133 in the second direction 800.

[0075] Thus, according to the current collecting structure 100 provided by the embodiment of the present application, the sizes of the first folding portion 132 and the second folding portion 133 in the second direction 800 are smaller than the size of the adapter body 131, so that the first folding portion 132 and the second folding portion 133 are easier to identify relative to the adapter body 131, thereby facilitating the operation of folding the current collecting structure 100. In addition, the first folding portion 132 and the second folding portion 133 are smaller in size and have a lower strength relative to the adapter body 131, making it easier to bend the first folding portion 132 and the second folding portion 133 when the current collecting structure 100 is folded.

[0076] In an embodiment, Figure 1 As shown, Figure 1 2 is a schematic diagram of a plan view of a current collecting structure 100 provided according to an embodiment of the present application. Figure 1The perspective in the figure is equivalent to observing from the axial direction of the first connecting portion 110 to be described later. This axial direction is also the axial direction of the bare cell and the height direction of the battery in which the bare cell is located. The battery may be, for example, a cylindrical battery, so this axial direction is also the axial direction of the battery and the axial direction of the battery shell. In the normal storage state of the battery, this axial direction is essentially also the vertical direction.

[0077] exist Figure 1 In the perspective given in FIG. 1 , the second connecting portion 120 can be, for example, a rectangular sheet structure, the adapter body 131 can be, for example, a rectangular sheet structure, and the first folding portion 132 and the second folding portion 133 can be, for example, a rectangular sheet structure. Figure 1 The horizontal direction in the figure is also the width direction of the second connecting portion 120, the first folding portion 132, the second folding portion 133 and the adapter body 131, and the second direction perpendicular to the first direction 700 is the length direction of the aforementioned four.

[0078] According to the current collecting structure 100 provided in the embodiment of the present application, the first connecting portion 110 may have at least one arc edge 111 matching the bare battery cell. When observed along the axial direction of the arc edge 111, the folded current collecting structure 100 does not exceed the circle where the arc edge 111 is located.

[0079] Thus, according to the current collecting structure 100 provided in the embodiment of the present application, generally speaking, the circle where the arc edge 111 of the current collecting structure 100 is located will not be larger than the outer diameter of the winding core. This means that if the folded current collecting structure 100 does not exceed the circle where the arc edge 111 is located, then the projection of the current collecting structure 100 along the axial direction on a plane perpendicular to the axial direction will not be outside the winding core. This means that after the current collecting structure 100 forms a pre-assembled body on the winding core, it will not interfere with the opening of the shell when it is inserted into the shell.

[0080] In the embodiment, still see Figure 1 ,exist Figure 1 In the given example, the shape of the first connection portion 110 can be described on the basis of a circular sheet structure, that is, the first connection portion 110 is a part of a circle.

[0081] Specifically, the first connection portion 110 has a center hole coaxial with the winding core. The first side portion 113 on the left side of the first connection portion 110 for connecting with the adapter portion 130 is essentially the chord of the circle mentioned above. The chord is a part of the outer edge of the first connection portion 110. The two sides of the circumference of the first connection portion 110 adjacent to the chord are the two arc sides 111 mentioned above. The center angles corresponding to these two arc sides 111 can be the same for easy processing. In an embodiment, the arc side 111 matches the bare cell, that is, the winding core, which means that the centering of the winding core and the first connection portion 110 is achieved by the axis (or center of the circle) determined by the arc side 111. This centering process can also be facilitated by the center hole.

[0082] In the embodiment, a notch portion 112 to be mentioned in the subsequent description is sandwiched between the two arc edge portions 111 in the circumferential direction, which will be explained in the subsequent description.

[0083] See also Figure 2 According to the current collecting structure 100 provided in the embodiment of the present application, the first connecting portion 110 may have a first side portion 113 as described above connected to the first folding portion 132, and the distance from the first side portion 113 to the center of the arc side portion 111 is L1. Figure 2 The second connecting portion 120 may have a second side portion 122 connected to the second folding portion 133, combined with Figure 3 The second connection portion 120 may have a step portion 121 extending along the second direction 800, and the distance between the second side portion 122 and the step portion 121 is L2. In an embodiment, the dimension of the adapter body 131 in the first direction 700 may be L, and L may satisfy L=L1+L2.

[0084] In an embodiment, the dimension of the adapter body 131 in the first direction 700 may be L to meet the above requirements, so that the folded current collecting structure 100 can achieve the coincidence of the diameter of the first connection portion 110 extending along the second direction 800 with the step portion 121. In an embodiment, when the step portion 121 is connected to the cover plate body 200, the step portion 121 can be coincident with the diameter of the cover plate body 200 (i.e., the circular cover plate) extending along the second direction 800, so that after the second connection portion 120 is connected to the cover plate body 200 in a centered manner in the second direction 800, as the folding of the current collecting structure 100 is completed, the first connection portion 110 of the current collecting structure 100 can be coaxially centered with the cover plate body 200.

[0085] Since the diameter of the cover body 200 is larger than the diameter of the circle where the arc edge 111 of the first connecting portion 110 is located, the folded current collecting structure 100 will not exceed the outer edge of the cover body 200, which is further beneficial to the pre-assembly structure formed by the cover body 200, the current collecting structure 100 and the winding core to avoid interference when entering the shell.

[0086] In the examples, see Figure 2 , Figure 2 Another view of the current collecting structure 100 is given, in which the direction of the step portion 121 is shown. In the embodiment, with the step portion 121 as the boundary, a portion of the second connection portion 120 away from the transition portion 130 has a higher height than a portion of the second connection portion 120 close to the transition portion 130 when connected to the cover plate body 200. In other words, starting from the step portion 121, the second connection portion 120 further extends upward to pass through the step portion 121 in the through hole 370 of the insulating member 300 described below, thereby passing through the insulating member 300 so that a portion of the second connection portion 120 away from the transition portion 130 is connected to the cover plate body 200.

[0087] According to the current collecting structure 100 provided by the embodiment of the present application, in the embodiment, the dimension of the first folded portion 132 in the first direction 700 is 0.1-10 mm.

[0088] like Figure 1 As shown, the size of the first folded portion 132 and the subsequent second folded portion 133 is Figure 1 is marked as D. In an embodiment, the width dimension of the first folding portion 132 may be, for example, 0.1 mm, thereby substantially forming a "crease". In addition, the width dimension of the first folding portion 132 may be larger, so that when the first folding portion 132 is folded to form two angled parts, the dimensions of the two parts in the first direction 700 can be adaptively adjusted, thereby providing an adjustable margin for the relative position relationship between the first connecting portion 110 and the adapter body 131, thereby offsetting the tolerance of the manufacturing process of the current collecting structure 100. In an embodiment, the upper limit of the first folding portion 132 may be, for example, 10 mm. On the one hand, it is considered that if the size of the first folding portion 132 is too large, the overall size of the battery will increase. On the other hand, if the size of the first folding portion 132 is too large, the folded shape of the first folding portion 132 may be difficult to control.

[0089] In an embodiment, the size of the first folding portion 132 may be, for example, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm or 9 mm. As an alternative example, or based on the size of the first folding portion 132 as above, the size of the second folding portion 133 in the first direction 700 may also be 0.1-10 mm. Here, the situation and size of the second folding portion 133 may be the same, and will not be repeated here.

[0090] According to the current collecting structure 100 provided in the embodiment of the present application, the first connecting portion 110 may have the notch portion 112 as mentioned above located on the side opposite to the side where the first folding portion 132 is located, and the notch portion 112 may be used to avoid the explosion-proof structure of the battery where the bare battery cell is located. In the embodiment, as described above, the first connecting portion 110 includes two arc edges 111 opposite to each other, and the notch portion 112 is sandwiched between the two arc edges 111 to facilitate the standardized processing of the shape of the current collecting structure 100.

[0091] According to a second aspect of the embodiment of the present application, a cover plate assembly is provided, the cover plate assembly includes the above current collecting structure 100, and also has the above beneficial effects, which will not be repeated here. Figure 3 and Figure 7 As shown, the cap assembly may further include the cap body 200 and the insulating member 300 as mentioned above. In an embodiment, the insulating member 300 may be formed of, for example, a plastic material, which serves as a "lower plastic" in a common sense in a battery.

[0092] In an embodiment, the insulating member 300 may also be a disc-shaped structure, which may be bonded to the bottom of the cover plate body 200 by adhesive bonding or ultrasonic welding. The insulating member 300 may be provided with a through hole 370 as mentioned above, allowing the second connection portion 120 to pass through the insulating member 300 so as to be welded to the cover plate body 200 by laser. Figure 3 Cover assembly shown.

[0093] According to a second aspect of an embodiment of the present application, a cover plate assembly is provided, which is used to be connected to a battery shell, the shell having an opening for a bare battery cell to enter the interior of the shell, the bare battery cell having a tab, and the cover plate assembly comprising a cover plate body 200 and a current collecting structure 100.

[0094] In an embodiment, the current collecting structure 100 includes a first connection part 110 , a second connection part 120 and a transition part 130 , the first connection part 110 is used to be electrically connected to the pole tab, the second connection part 120 is electrically connected to the cover plate body 200 , and the transition part 130 connects the first connection part 110 and the second connection part 120 .

[0095] In an embodiment, the adapter portion 130 is angled with respect to both the first connection portion 110 and the second connection portion 120, and at least two portions of the adapter portion 130 are formed at an angle with each other, such that portions of the first connection portion 110 and portions of the second connection portion 120 are respectively stacked on opposite sides of the adapter portion 130 that face each other.

[0096] Thus, according to the cover assembly provided by the embodiments of the present application, the current collecting structure 100 is electrically connected to the cover body 200, such that the cover body 200 can serve as one pole portion of the battery, thereby omitting components such as pole posts, reducing the space occupied by the cover body 200 and the number of parts, facilitating a reduction in the complexity of the cover assembly, and providing more layout space for the bare battery cells, and improving the energy density of the battery.

[0097] In an embodiment, the cover assembly provided by the embodiments of the present application can be based on the cover assembly of Figure 3 and Figure 4 After folding the current collecting structure 100, the cover assembly is formed into the form described in Figure 6 That is to say, the cover assembly here includes the current collecting member in the folded form as described above.

[0098] According to the cover assembly provided by the embodiments of the present application, the cover assembly may further include an insulating member 300, and the insulating member 300 can be connected to the side of the cover body 200 that is electrically connected to the current collecting structure 100, that is, the lower side of the cover body 200.

[0099] In an embodiment, the insulating member 300 can have a through hole 370, and the second connection portion 120 can pass through the through hole 370 to be electrically connected to the cover body 200. In an embodiment, the insulating member 300 has a first recess 310 provided on the side facing away from the cover body 200, and portions of the second connection portion 120 and the adapter portion 130 are located in the first recess 310.

[0100] As Figure 3 、 6 and shown in 7, the first recess 310 can be a generally strip-shaped recess opened below the insulating member 300, and one of the two open positions on both sides of the first recess 310 in the first direction 700 is closed and the other is open, so as to facilitate the insertion of the current collecting structure 100 into the first recess 310. In an embodiment, the width of the first recess 310 is greater than the widths of the adapter portion 130 and the second connection portion 120.

[0101] In an embodiment, the through hole 370 may be, for example, rectangular in shape, and its length may be, for example, the same as or slightly greater than the length of the second connection portion 120. The width of the through hole 370 may be greater than or slightly greater than the width of the portion of the stepped portion 121 of the second connection portion 120 that is connected to the cover plate body 200 on the right side.

[0102] In an embodiment, the inner edge portion of the through hole 370 that cooperates with the stepped portion 121 may pass through the diameter of the insulating member 300 that extends along the second direction 800, that is, it also passes through the diameter of the cover plate body 200 that extends along the second direction 800, and is centered with the cover plate body 200 and the insulating member 300 in the second direction 800. In other words, the centers of the cover plate body 200 and the insulating member 300 are at the midpoint of the inner edge portion of the through hole 370 that cooperates with the stepped portion 121. Thus, as mentioned in the above description, after the current collector structure 100 is folded, the first connection portion 110 is centered with both the insulating member 300 and the cover plate body 200, which facilitates the insertion of the core into the shell.

[0103] According to the cover plate assembly provided by the embodiment of the present application, the insulating member 300 may further have a first limiting member 330 and a second limiting member 340 disposed in the first recess 310. The second connection portion 120 may have a stepped portion 121 that extends along the edge of the through hole 370 close to the second connection portion 120. The first limiting member 330 and the second limiting member 340 may respectively abut against both sides of the second connection portion 120 in the extending direction of the stepped portion 121.

[0104] In an embodiment, according to the embodiment of the present application, the relative position of the second connection portion 120 and the insulating member 300 is ensured to be fixed by the first limiting member 330 and the second limiting member 340, ensuring the reliability of the installation of the current collector structure 100. As an example, both the first limiting member 330 and the second limiting member 340 may be strip-shaped limiting protrusions, and the first limiting member 330 and the second limiting member 340 may be integral with the main body structure of the insulating member 300.

[0105] According to the cover plate assembly provided by the embodiment of the present application, the insulating member 300 may further have a second recess 320. The first recess 310 may be located within the second recess 320, and the first connection portion 110 is located within the first recess 310. In an embodiment, the second recess 320 may be defined by a wall portion provided at the outer edge of the disc-shaped main body structure of the insulating member 300.

[0106] See Figure 7 In an embodiment, when the insulating member 300 is in Figure 7When viewed from the perspective in [description], the first recess 310 has a greater depth relative to the second recess 320. The first recess 310 is substantially equivalent to being located at the bottom of the second recess 320. The first recess 310 and the second recess 320 accommodate the current collector member in the folded posture, form protection for it, and make the size of the cover plate assembly smaller in the battery height direction.

[0107] According to the cover plate assembly provided by the embodiment of the present application, the insulating member 300 may further have a liquid injection hole 350 and an explosion-proof valve pressure relief hole 360 that penetrate the insulating member 300 and are disposed in the first recess 310. As mentioned in the above description, the position of the notch portion 112 of the first connecting portion 110 as above may correspond to the position of the explosion-proof valve pressure relief hole 360 to avoid the explosion-proof valve pressure relief hole 360.

[0108] In addition, it should be noted that according to the cover plate assembly provided by the embodiment of the present application, the cover plate assembly may include a folded structure formed after folding the current collector structure 100 as above. Therefore, substantially, the cover plate assembly here has the same structure as the current collector structure 100 above, but exists in an angled posture formed after folding.

[0109] That is, the transition portion 130 of the folded structure also includes a transition body 131, a first folding portion 132, and a second folding portion 133. The first folding portion 132 and the second folding portion 133 are respectively connected to two opposite side portions of the transition body 131. The first folding portion 132 is connected to the first connecting portion 110, and the second folding portion 133 is connected to the second connecting portion 120. On this basis, the first folding portion 132, the second folding portion 133, and the transition body 131 are all formed into two angled parts, so that the portions of the first connecting portion 110 and the second connecting portion 120 are respectively stacked on opposite sides of the transition body 131.

[0110] In addition, the dimension of the transition body 131 between the first folding portion 132 and the second folding portion 133 (i.e., the dimension in the first direction 700) is L, and it also satisfies L = L1 + L2. Wherein, L1 is the distance from the first side portion 113 as above to the center of the arc side portion 111, and L2 is the distance between the second side portion 122 and the stepped portion 121. The beneficial effects are the same as above and will not be elaborated here.

[0111] In addition, in the cover assembly, the distance (width) of the first folding portion 132 extending between the adapter body 131 and the first connecting portion 110 is 0.1-10 mm, and / or the distance (width) of the second folding portion 133 extending between the adapter body 131 and the second connecting portion 120 is 0.1-10 mm. The lengths of the first folding portion 132 and the second folding portion 133 are respectively smaller than the two side portions. Here, the size and arrangement of the first folding portion 132 and the second folding portion 133 are the same as those described above, and the beneficial effects are the same as above, which will not be repeated here.

[0112] In the examples, see Figure 5 The cover assembly also includes an explosion-proof valve protection sheet 400 and an explosion-proof valve 500 arranged on the cover body 200, as well as a sealing plug 620 and a sealing aluminum nail 610 arranged on the cover for closing the cover injection hole 370. The sealing aluminum nail 610 and the cover body 200 can be welded together.

[0113] According to the third aspect of the embodiment of the present application, a battery includes the cover plate assembly as above, and also includes the shell and bare battery cell as above, and the beneficial effects are not repeated here.

[0114] According to the fourth aspect of the embodiments of the present application, a battery pack includes the above batteries, and the number of batteries can be multiple. The multiple batteries can be cylindrical lithium batteries. In an embodiment, the multiple batteries can form a module in the box of the battery pack to form a battery pack. In other examples, multiple batteries can be directly packaged, that is, CTP (Cell to Pack). In an embodiment, the battery pack can, for example, provide electrical energy for an electrical device, and the electrical device can, for example, be an electric car, which is at least driven by electrical energy to achieve driving.

[0115] The above are only preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. All equivalent structural changes made by using the contents of the present application specification and drawings under the innovative concept of the present application, or directly / indirectly applied in other related technical fields are included in the protection scope of the present application.

Claims

1. A current collection structure, characterized in that, The current collecting structure is used to be electrically connected to a bare cell, wherein the bare cell comprises a cell body and a tab connected to the cell body, and the current collecting structure comprises: A first connection portion, the first connection portion is used to be electrically connected to the tab; a second connection portion, the second connection portion being used to electrically connect to an external structure, the first connection portion and the second connection portion being spaced apart in a first direction; A transition portion, the transition portion comprising a transition body, a first folding portion and a second folding portion, the first folding portion and the second folding portion are respectively connected to two edges of the transition body in the first direction, the first folding portion is connected to the first connecting portion, and the second folding portion is connected to the second connecting portion; The first folding portion, the second folding portion and the adapter body can all be bent so that a portion of the first connecting portion and a portion of the second connecting portion are respectively overlapped on two opposite sides of the bent adapter body.

2. The current collection structure according to claim 1, characterized in that, A dimension of the transition portion in a second direction perpendicular to the first direction is greater than a dimension of the first folded portion in the second direction, and a dimension of the transition portion in the second direction is greater than a dimension of the second folded portion in the second direction.

3. The current collector structure according to claim 1, characterized in that The first connecting portion has at least one arc edge that matches the bare battery cell, and when observed along the axial direction of the arc edge, the folded current collecting structure does not exceed the circle where the arc edge is located.

4. The current collecting structure according to claim 1, characterized in that: The first connecting portion has at least one arc edge matching the bare battery cell, and the first connecting portion also has a first edge connected to the first folding portion, and the distance from the first edge to the center of the arc edge is L1; The second connecting portion has a second side portion connected to the second folding portion, the second connecting portion has a step portion extending along the second direction, and the distance between the second side portion and the step portion is L2; The dimension of the adapter body in the first direction is L, and L satisfies L=L1+L2.

5. The current collecting structure according to any one of claims 1 to 4, characterized in that: A size of the first folded portion in the first direction is 0.1-10 mm, and / or a size of the second folded portion in the first direction is 0.1-10 mm.

6. The current collecting structure according to any one of claims 1 to 4, characterized in that: The first connecting portion has a notch portion located on a side opposite to the side where the first folding portion is located, and the notch portion is used to avoid the explosion-proof structure of the battery where the bare battery cell is located; Wherein, the first connecting portion includes two arc edges opposite to each other, and the notch portion is sandwiched between the two arc edges.

7. A cover plate assembly, characterized in that, The cover plate assembly comprises the current collecting structure according to any one of claims 1 to 6.

8. A cover plate assembly, characterized in that, The cover plate assembly is used to be connected to a battery housing, the housing has an opening for a bare cell of the battery to enter the interior of the housing, the bare cell has a tab, and the cover plate assembly comprises: Cover plate body; Current collecting structure, the current collecting structure includes a first connection part, a second connection part and a transfer part, the first connection part is used for electrically connecting with the tab, the second connection part is electrically connected with the cover plate body, and the transfer part connects the first connection part and the second connection part; Wherein, the transfer part is arranged at an angle relative to both the first connection part and the second connection part, and at least two parts of the transfer part are arranged at an angle with respect to each other, so that parts of the first connection part and parts of the second connection part are respectively stacked on opposite sides of the transfer part.

9. The cover plate assembly according to claim 8, wherein The cover plate assembly further includes: Insulating member, the insulating member is connected to the side of the cover plate body that is electrically connected to the current collecting structure; Wherein, the insulating member has a through hole, and the second connection part passes through the through hole to be electrically connected to the cover plate body; Wherein, the insulating member has a first recess provided on the side facing away from the cover plate body, and the part of the second connection part and the transfer part are located in the first recess.

10. The cover plate assembly according to claim 9, wherein The insulating member further has a first limiting member and a second limiting member provided in the first recess; Wherein, the second connection part has a stepped part extending along the edge of the through hole close to the second connection part, and the first limiting member and the second limiting member respectively abut on both sides of the second connection part in the extending direction of the stepped part.

11. The cover plate assembly according to claim 9, wherein, The insulating member further has a second recess, the first recess is located in the second recess, and the first connection part is located in the first recess.

12. The cover plate assembly according to claim 9, wherein, The insulating member further has a liquid injection hole and an explosion-proof valve pressure relief hole penetrating through the insulating member provided in the first recess; The first connection part has a notch, and the position of the notch corresponds to the position of the explosion-proof valve pressure relief hole to avoid the explosion-proof valve pressure relief hole; Wherein, the first connection part includes two arc edge parts opposite to each other, and the notch is clamped between the two arc edge parts.

13. The cover plate assembly according to any one of claims 8 to 12, characterized in that The transfer part includes a transfer main body, a first folding part and a second folding part, the first folding part and the second folding part are respectively connected to two opposite side edges of the transfer main body, the first folding part connects the first connection part, and the second folding part connects the second connection part; Wherein, the first folding part, the second folding part and the transfer main body all form two angled parts, so that the part of the first connection part and the part of the second connection part are respectively stacked on opposite sides of the transfer main body.

14. The cover plate assembly according to claim 13, characterized in that The first connection part has at least one arc edge part matching the bare battery cell, the first connection part further has a first side edge connected to the first folding part, and the distance from the first side edge to the center of the arc of the arc edge part is L1; The second connecting portion has a second side portion connected to the second folding portion. The second connecting portion has a stepped portion parallel to the second side portion. The distance between the second side portion and the stepped portion is L2; Wherein, the dimension of the adapter body between the first folding portion and the second folding portion is L, and L satisfies L = L1 + L2; The cover plate body has a center of the circle. The stepped portion passes through the center of the circle of the cover plate body and is bisected by the center of the circle of the cover plate body. The line connecting the center of the circle of the arc side portion and the center of the circle of the cover plate body is perpendicular to the stepped portion.

15. The cover plate assembly according to item in claim 13, wherein The distance that the first folding portion extends between the adapter body and the first connecting portion is 0.1 - 10 mm, and / or the distance that the second folding portion extends between the adapter body and the second connecting portion is 0.1 - 10 mm; The lengths of the first folding portion and the second folding portion are respectively less than those of the two side portions.

16. The cover plate assembly according to any one of claims 8 to 12, wherein The cover plate body is of a circular structure and has a first axis. The first connecting portion has at least one arc side portion. The arc side portion has a second axis. The first axis and the second axis coincide.

17. A battery, characterized in that, The battery includes the cover plate assembly according to any one of claims 9 to 16.

18. A battery pack, characterized in that, The battery pack includes the battery according to claim 17.

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