Current collector prefabricated member, current collector and battery

Abstract

The utility model discloses a current collector prefabricated member, a current collector and a battery, the current collector prefabricated member is bent at least once to prepare the current collector, the current collector prefabricated member comprises a first connecting section and a second connecting section which are connected, the first connecting section is provided with a pole connecting part, and the first connecting section is provided with a first side edge and a second side edge which are oppositely arranged; the first side edge is provided with a first end, the second side edge is provided with a second end, and the first end is closer to the pole connecting part than the second end; the second connecting section is provided with a third side edge and a fourth side edge which are oppositely arranged, the first side edge and the third side edge are located on the same side, the second side edge and the fourth side edge are located on the same side, in the width direction of the current collector prefabricated part, the first side edge is closer to the second side edge than the third side edge, and the fourth side edge is closer to the third side edge than the second side edge. The current collector prepared by the current collector prefabricated member has good structural strength and is not easy to crack, and the flow capacity of the battery is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of batteries, and particularly relates to a current collector prefabricated piece, a current collector and a battery. BACKGROUND

[0002] The core package of the square battery is divided into same-side tab core packages and different-side tab core packages, and the different-side tab core package is connected with the pole column on the battery fixed top cover through the current collector. The current collector is mostly formed by one-time stamping and one-time bending, the material thickness of the bending part is thinned, the deformation of the bending part is large, the material strength is low, and the current collector is prone to cracking, thereby affecting the overcurrent capacity of the battery. CONTENT OF THE UTILITY MODEL

[0003] The current collector prefabricated piece, the current collector and the battery provided in the application embodiment solve the problem that the material strength of the existing current collector is low due to the thinned material thickness and the current collector is prone to cracking.

[0004] In a first aspect, the application embodiment provides a current collector prefabricated piece, the current collector prefabricated piece is prepared into a current collector through at least one bending, and the current collector prefabricated piece comprises:

[0005] A first connecting section, the first connecting section is provided with a pole column connecting part, the first connecting section has oppositely arranged first and second side edges, the first side edge has a first end, and the second side edge has a second end, the first end is closer to the pole column connecting part than the second end;

[0006] A second connecting section, the second connecting section is connected with the first connecting section and has oppositely arranged third and fourth side edges, the first side edge and the third side edge are located on the same side, and the second side edge and the fourth side edge are located on the same side, along the width direction of the current collector prefabricated piece, the first side edge is closer to the second side edge than the third side edge, and the fourth side edge is closer to the third side edge than the second side edge.

[0007] Optionally, the distance between the straight line where the first side edge and the third side edge are located and the straight line where the second side edge and the fourth side edge are located is D1, and the distance between the straight line where the second side edge and the fourth side edge are located and the straight line where the first side edge and the third side edge are located is D2, wherein D1=D2.

[0008] Optionally, the distance between the straight line where the first side edge and the third side edge are located and the straight line where the second side edge and the fourth side edge are located is D1, the distance between the straight line where the second side edge and the fourth side edge are located and the straight line where the first side edge and the third side edge are located is D2, and the thickness of the current collector prefabricated piece is D, wherein D1=D2>D.

[0009] Optionally, the distance between the straight line where the first side edge and the third side edge are located and the straight line where the second side edge and the fourth side edge are located is D1, the distance between the straight line where the second side edge and the fourth side edge are located and the straight line where the first side edge and the third side edge are located is D2, 0

[0010] Optionally, an angle formed between a virtual straight line connecting the first end and the second end and the second side is α, where α = 45°.

[0011] Optionally, the first side is provided with a bevel near the first end, and the bevel is connected to the third side.

[0012] Optionally, the second side is provided with a bevel near the second end, and the bevel is connected to the fourth side.

[0013] Optionally, the pole connecting part comprises a fitting hole or a fitting groove.

[0014] In a second aspect, the embodiments of the present application further provide a current collector, wherein the current collector is formed by bending the current collector preform at least once.

[0015] Optionally, the current collector comprises:

[0016] a first connecting part, wherein a pole connecting part is arranged on the first connecting part, and the first connecting part is used to connect a pole;

[0017] a second connecting part, which is used to connect a tab;

[0018] a folding part, wherein the folding part connects the first connecting part and the second connecting part, the first connecting part extends in a first direction, the second connecting part extends in a second direction, and the first direction is arranged perpendicularly to the second direction.

[0019] Optionally, the second connecting part comprises a first connecting subpart, a second connecting subpart and a third connecting subpart, the second connecting subpart is located between the first connecting subpart and the third connecting subpart, the first connecting subpart is closer to the first connecting part than the third connecting subpart, a plane on which the first connecting subpart is arranged is arranged in parallel to a plane on which the third connecting subpart is arranged, and the second connecting subpart connects the first connecting subpart and the third connecting subpart.

[0020] Optionally, an angle formed between the second connecting subpart and the third connecting subpart is β, where 115° ≤ β < 180°.

[0021] In a third aspect, the embodiments of the present application further provide a battery, which comprises the current collector.

[0022] The current application provides a current collector preform, a current collector and a battery. The current collector preform is prepared into a current collector through at least one bending. The current collector preform comprises a first connecting section and a second connecting section. The first connecting section is provided with a pole connecting part. The first connecting section has a first side edge and a second side edge arranged oppositely. The second connecting section has a third side edge and a fourth side edge arranged oppositely. In the width direction of the current collector preform, the first side edge is closer to the second side edge than the third side edge, and the fourth side edge is closer to the third side edge than the second side edge. That is, the first side edge and the third side edge are arranged in a staggered manner, and the second side edge and the fourth side edge are arranged in a staggered manner. The staggered arrangement provides a space for the bending of the current collector preform, which is beneficial to the bending of the current collector preform. The current collector preform has good structural strength and overcomes the problem of low material strength and easy cracking caused by the thinning of the material thickness of the current collector. The current collector prepared from the current collector preform has good structural strength and is not easy to crack, thereby improving the overcurrent capacity of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] In order to more completely understand the present application and its beneficial effects, the following will be described with reference to the drawings. In the following description, the same reference numerals represent the same parts.

[0025] Figure 1 The structural schematic diagram of the current collector preform provided by the embodiments of the present application is shown.

[0026] Figure 2 The schematic diagram of the current collector preform provided by the embodiments of the present application after being turned over 180° is shown.

[0027] Figure 3 The schematic diagram of the current collector preform provided by the embodiments of the present application after being bent 90° is shown.

[0028] Figure 4 The structural schematic diagram of the current collector provided by the embodiments of the present application is shown.

[0029] Figure 5 The side view of the current collector provided by the embodiments of the present application is shown.

[0030] Figure 6 The structural schematic diagram of the current collector provided by the embodiments of the present application is shown.

[0031] The reference numerals are:

[0032] 10, current collector; 11, first connecting part; 12, second connecting part; 123, first connecting subpart; 124, second connecting subpart; 125, third connecting subpart;

[0033] 100, current collector preform; 110, first connecting section; 111, pole connecting part; 112, first side edge; 113, second side edge; 114, first end; 115, second end; 116, bevel

[0034] 120, second connecting section; 121, third side edge; 122, fourth side edge; 13, folding part;

[0035] 20, tab; 30, top cover; 40, core package; 50, pole. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0037] Referring to Figure 1 , Figure 4 and Figure 6 , the present embodiment provides a current collector preform 100, which is prepared into a current collector 10 by at least one bending. The current collector 10 is used to connect a tab 20 and a pole 50 of a battery cell. The current collector preform 100 comprises a first connecting section 110 and a second connecting section 120.

[0038] Referring to Figure 1 , the first connecting section 110 is a flat strip structure. The material of the first connecting section 110 is a metal material, such as copper and aluminum. The first connecting section 110 is provided with a pole connecting part 111, and the number of the pole connecting part 111 can be one or more. In some embodiments, the pole connecting part 111 comprises a mounting hole or a mounting groove, and the shape of the mounting hole can be circular, rectangular, waist-shaped, hexagonal or other irregular shapes. The first connecting section 110 has a first side edge 112 and a second side edge 113 arranged oppositely, and the first side edge 112 and the second side edge 113 extend along the length direction of the first connecting section 110. The first side edge 112 has a first end 114, and the second side edge 113 has a second end 115, and the first end 114 is closer to the pole connecting part 111 than the second end 115. The first connecting section 110 is provided with an arc-shaped chamfer at one end of the first end 114 and the second end 115.

[0039] Referring to Figure 1The second connecting section 120 is a flat strip structure, and the material of the second connecting section 120 is the same as that of the first connecting section 110. One end of the second connecting section 120 is connected with the end where the first end 114 and the second end 115 of the first connecting section 110 are located. The first connecting section 110 and the second connecting section 120 are integrally formed, such as by stamping, cutting and the like. The second connecting section 120 has a third side edge 121 and a fourth side edge 122 arranged oppositely. The third side edge 121 and the fourth side edge 122 extend along the length direction of the second connecting section 120. The first side edge 112 is located on the same side as the third side edge 121, and the first end 114 of the first side edge 112 is connected with the third side edge 121. The second side edge 113 is located on the same side as the fourth side edge 122, and the second end 115 of the second side edge 113 is connected with the fourth side edge 122. In the width direction of the current collector preform 100, the first side edge 112 is closer to the second side edge 113 than the third side edge 121, and the fourth side edge 122 is closer to the third side edge 121 than the second side edge 113. It can be understood that the vertical distance between the straight line where the first side edge 112 and the second side edge 113 are located and the straight line where the third side edge 121 and the second side edge 113 are located is less than the vertical distance between the straight line where the fourth side edge 122 and the third side edge 121 are located and the straight line where the second side edge 113 and the third side edge 121 are located.

[0040] In the embodiments of the present application, referring to Figure 2 and Figure 3 , the first connecting section 110 has a virtual line segment connecting the first end 114 and the second end 115. After the first connecting section 110 is bent by 180° relative to the second connecting section 120 along the virtual line segment, the second connecting section 120 is bent by 90° along the straight line where the second side edge 113 is located to prepare the current collector 10. The first side edge 112 of the first connecting section 110 is arranged in a staggered manner with the third side edge 121 of the second connecting section 120, and the second side edge 113 of the first connecting section 110 is arranged in a staggered manner with the fourth side edge 122 of the second connecting section 120, so as to provide sufficient space for the first connecting section 110 to be flipped. The probability of interference occurring when the first connecting section 110 is flipped relative to the second connecting section 120 is reduced, and the current collector preform 100 is convenient for being bent to prepare the current collector 10. The current collector 10 prepared by the current collector preform 100 has good structural strength and is not easy to crack, thereby improving the overcurrent capacity of the battery.

[0041] In some embodiments, referring to Figure 1 , the distance between the straight line where the first side edge 112 and the third side edge 121 are located and the straight line where the second side edge 113 and the fourth side edge 122 are located is D1, and the distance between the straight line where the second side edge 113 and the fourth side edge 122 are located and the straight line where the first side edge 112 and the third side edge 121 are located is D2, wherein D1=D2.

[0042] In the embodiments of the present application, the sizes of the avoidance spaces formed on the two sides of the first connecting section 110 are the same, which facilitates processing and ensures the molding effect.

[0043] In some embodiments, the thickness of the first connecting section 110 is the same as the thickness of the second connecting section 120. In this way, the structural strength of the current collector 10 is as consistent as possible, and the flow effect is ensured.

[0044] In some embodiments, as shown in Figure 1 , the distance between the straight line where the first side edge 112 and the third side edge 121 are located and the straight line where the second side edge 113 and the fourth side edge 122 are located is D1, the distance between the straight line where the second side edge 113 and the fourth side edge 122 are located and the straight line where the first side edge 112 and the third side edge 121 are located is D2, and the thickness of the current collector preform 100 is D, wherein D1=D2≥D. Since the current collector preform 100 has a certain thickness, interference is easily formed at the turning position of the current collector 10, and the current collector 10 protrudes to both sides, which affects the reliability of the current collector 10. In the embodiments of the present application, D1=D2≥D is set, the avoidance space formed is large enough, the interference in the preparation process of the current collector 10 is reduced, and the processing of the current collector 10 is facilitated.

[0045] In some embodiments, as shown in Figure 1 , the distance between the straight line where the first side edge 112 and the third side edge 121 are located and the straight line where the second side edge 113 and the fourth side edge 122 are located is D1, the distance between the straight line where the second side edge 113 and the fourth side edge 122 are located and the straight line where the first side edge 112 and the third side edge 121 are located is D2, 0<D1≤1mm, and / or, 0<D2≤1mm. The value of D1 can be 0.1, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1 or other listed values. The value of D2 can be 0.1, 0.3, 0.4, 0.5, 0.6, 0.7, 0.9, 1 or other listed values.

[0046] In some embodiments, as shown in Figure 1 , the angle between the virtual straight line connecting the first end 114 and the second end 115 and the second side edge 113 is α, wherein α=45°.

[0047] It can be understood that when α=45°, the first connecting section 110 is turned by 180° relative to the second connecting section 120, and the first connecting section 110 forms a 90° angle relative to the second connecting section 120, which is conducive to the processing and molding of the current collector 10.

[0048] In some embodiments, as shown in Figure 1 , a bevel 116 is arranged on the first side edge 112 close to the first end 114, and the bevel 116 is connected to the third side edge 121; and / or, a bevel 116 is arranged on the second side edge 113 close to the second end 115, and the bevel 116 is connected to the fourth side edge 122.

[0049] For example, as shown in Figure 1The first side edge 112 includes a straight edge and a slant edge 116, and the slant edge 116 of the first side edge 112 is arranged close to the first end 114. The slant edge 116 of the first side edge 112 is arranged close to one end of the third side edge 121, and the one end of the third side edge 121 is the first end 114. The slant edge 116 of the first side edge 112 connects the straight edge and the third side edge 121. The second side edge 113 includes a straight edge and a slant edge 116, and the slant edge 116 of the second side edge 113 is arranged close to the second end 115. The slant edge 116 of the second side edge 113 is arranged close to one end of the fourth side edge 122, and the one end of the fourth side edge 122 is the second end 115. The slant edge 116 of the second side edge 113 connects the straight edge and the fourth side edge 122. The slant edge 116 is arranged on at least one side of the first connecting section 110, so as to facilitate the bending of the first connecting section 110.

[0050] Referring to Figure 1 , Figure 2 , Figure 3 and Figure 4 , the application further provides a current collector 10. The current collector 10 is prepared by at least one time of turning over of the current collector preform 10.

[0051] For example, referring to Figure 1 , Figure 2 and Figure 3 , the first connecting section 110 has a virtual line segment connecting the first end 114 and the second end 115. After the first connecting section 110 is bent by 180° along the virtual line segment relative to the second connecting section 120, the second connecting section 120 is bent by 90° along the straight line on which the second side edge 113 is arranged, so as to prepare the current collector 10.

[0052] In the application, the first side edge 112 of the first connecting section 110 is arranged in a staggered manner with the third side edge 121 of the second connecting section 120, and the second side edge 113 of the first connecting section 110 is arranged in a staggered manner with the fourth side edge 122 of the second connecting section 120, so as to provide sufficient space for turning over of the first connecting section 110. The current collector 10 prepared by the current collector preform 100 has good structural strength and is not easy to crack, and the overcurrent capacity of the battery is improved.

[0053] In some embodiments, referring to Figure 4 , the current collector 10 includes a first connecting part 11, a second connecting part 12 and a folding part 13. The first connecting part 11 is provided with a pole connecting part 111, and the first connecting part 11 is used for connecting the pole 50. The second connecting part 12 is used for connecting the cell tab 20. The folding part 13 connects the first connecting part 11 and the second connecting part 12. The first connecting part 11 extends in a first direction, and the second connecting part 12 extends in a second direction. The first direction is arranged in a perpendicular manner with the second direction. The first direction is the positive direction of the X axis, and the second direction is the negative direction of the Z axis.

[0054] In some embodiments, referring to Figure 4 and Figure 5The second connecting part 12 comprises a first connecting sub-part 123, a second connecting sub-part 124 and a third connecting sub-part 125. The first connecting sub-part 123 and the third connecting sub-part 125 are flat and plate-shaped, and the second connecting sub-part 124 is plate-shaped and arranged obliquely. The first connecting sub-part 123 is closer to the first connecting part 11 than the third connecting sub-part 125, the second connecting sub-part 124 is located between the first connecting sub-part 123 and the third connecting sub-part 125, the plane where the first connecting sub-part 123 is located is arranged in parallel with the plane where the third connecting sub-part 125 is located, and the second connecting sub-part 124 connects the first connecting sub-part 123 and the third connecting sub-part 125. The length of the first connecting sub-part 123 is less than that of the third connecting sub-part 125. In the length direction of the second connecting part 12, the projection of the second connecting segment 120 falls within the folding part 13.

[0055] In the embodiments of the present application, the second connecting segment 120 is adapted to the shape of the side surface of the tab 20 of the core pack 40, so that the second connecting segment 120 is in close contact with the tab 20, the contact area is large, and the overcurrent effect is good.

[0056] In some embodiments, referring to Figure 5 , the included angle formed by the second connecting sub-part 124 and the third connecting sub-part 125 is β, where 115°≤β<180°. The value of β can be 115°, 120°, 130°, 140°, 150°, 160°, 170°, 179° or other values listed.

[0057] In the embodiments of the present application, the angle of the second connecting sub-part 124 is reasonably set, so that the probability of the situation that the structure strength of the current collector 10 is affected due to the relatively large bending of the second connecting sub-part 124 relative to the first connecting sub-part 123 and the third connecting sub-part 125 is reduced.

[0058] In some embodiments, referring to Figure 4 and Figure 5 , the folding part 13 is a right triangle structure, one end of the hypotenuse of the folding part 13 is connected to the first connecting part 11 away from the pole connecting part 111, and one of the right angles of the folding part 13 is connected to the second connecting part 12.

[0059] Referring to Figure 4 and Figure 6The application further provides a battery comprising the current collector 10. The battery further comprises a core package 40 and a top cover 30 arranged on the top of the core package 40. The top cover 30 is provided with a pole 50, and the core package 40 is provided with a tab 20 on the side adjacent to the top. The second connecting part 12 of the current collector 10 is located on one side of the tab 20, and the shape of the second connecting part 12 is matched with the shape of the side of the tab 20. The second connecting part 12 is welded with the tab 20. The first connecting part 11 is located between the top cover 30 and the core package 40, the pole 50 is located in the pole connecting part 111 on the first connecting part 11, and the first connecting part 11 connects the pole 50. The battery in the application has the same technical effect as the current collector 10 described above, and will not be described again.

[0060] In the above embodiments, the description of each embodiment has its own emphasis, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0061] In the description of the application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features.

[0062] The current collector preform, the current collector and the battery provided by the embodiments of the application are described in detail above, and the principles and implementation manners of the application are described by applying specific examples in this paper. The above embodiment description is only used to help understand the method of the application and its core idea; at the same time, for those skilled in the art, according to the idea of the application, the specific implementation manner and application range will be changed, and the above, the content of the specification should not be understood as the limitation of the application.

Claims

1. A current collector preform (100), characterized in that, The current collector preform (100) is formed by at least one bending process to create the current collector (10), the current collector preform (100) comprising: A first connecting segment (110) is provided with a pole post connecting part (111). The first connecting segment (110) has a first side (112) and a second side (113) disposed opposite to each other. The first side (112) has a first end (114) and the second side (113) has a second end (115). The first end (114) is closer to the pole post connecting part (111) than the second end (115). The second connecting segment (120) is connected to the first connecting segment (110) and has a third side (121) and a fourth side (122) arranged opposite to each other. The first side (112) and the third side (121) are located on the same side, and the second side (113) and the fourth side (122) are located on the same side. Along the width direction of the current collector preform (100), the first side (112) is closer to the second side (113) than the third side (121), and the fourth side (122) is closer to the third side (121) than the second side (113).

2. The current collector preform (100) according to claim 1, characterized in that, The distance between the first side (112) and the third side (121) is D1, and the distance between the second side (113) and the fourth side (122) is D2, where D1=D2.

3. The current collector preform (100) according to claim 1, characterized in that, The distance between the first side (112) and the third side (121) is D1, the distance between the second side (113) and the fourth side (122) is D2, and the thickness of the current collector preform (100) is D, where D1=D2≥D.

4. The current collector preform (100) according to claim 1, characterized in that, The distance between the first side (112) and the third side (121) is D1, and the distance between the second side (113) and the fourth side (122) is D2, 0 < D1 ≤ 1 mm, and / or 0 < D2 ≤ 1 mm.

5. The current collector preform (100) according to claim 1, characterized in that, The angle between the virtual straight line connecting the first end (114) and the second end (115) and the second side (113) is α, where α = 45°.

6. The current collector preform (100) according to any one of claims 1 to 5, characterized in that, A section of inclined edge (116) is provided on the first side (112) near the first end (114), and the inclined edge (116) is connected to the third side (121). And / or, the second side (113) is provided with a sloping edge (116) near the second end (115), the sloping edge (116) connecting to the fourth side (122).

7. The current collector preform (100) according to any one of claims 1 to 5, characterized in that, The pole connection part (111) includes an assembly hole or an assembly groove.

8. A current collector (10), characterized in that, The current collector preform (100) as described in any one of claims 1 to 7 is formed by bending the current collector (10) at least once.

9. The current collector (10) according to claim 8, characterized in that, include: The first connecting part (11) is provided with a pole post connecting part (111), and the first connecting part (11) is used to connect the pole post; The second connecting part (12) is used to connect the electrode tab; Folding part (13) connects the first connecting part (11) and the second connecting part (12). The first connecting part (11) extends along a first direction, and the second connecting part (12) extends along a second direction. The first direction and the second direction are perpendicular to each other.

10. The current collector (10) according to claim 9, characterized in that, The second connecting part (12) includes a first connecting sub-part (123), a second connecting sub-part (124), and a third connecting sub-part (125). The second connecting sub-part (124) is located between the first connecting sub-part (123) and the third connecting sub-part (125). The first connecting sub-part (123) is closer to the first connecting part (11) than the third connecting sub-part (125). The plane where the first connecting sub-part (123) is located is parallel to the plane where the third connecting sub-part (125) is located. The second connecting sub-part (124) connects the first connecting sub-part (123) and the third connecting sub-part (125).

11. The current collector (10) according to claim 10, characterized in that, The angle between the second connecting sub-part (124) and the third connecting sub-part (125) is β, where 115°≤β<180°.

12. A battery, characterized in that, Includes the current collector (10) as described in any one of claims 8 to 11.

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