Negative current collector and battery

Abstract

The utility model provides a cathode current collector and a battery, and relates to the technical field of battery structures, the cathode current collector comprises a first area and a second area, a first through hole is formed in the first area; the second area is arranged on the peripheral side of the first area in a surrounding mode, a plurality of through openings are formed in the second area, the two opposite ends of any through opening extend to form openings, the second area is divided into fixing parts and elastic parts through the through openings, and one elastic part is located between every two adjacent fixing parts. The through hole is used for dividing the second area into the fixed part and the elastic part, so that the elastic part can move relative to the fixed part, and when the negative current collector vibrates, the elastic part plays a role in buffering and elastic transition, so that the vibration of the negative current collector is reduced. And the situation that the negative current collector is subjected to unsoldering or falling under the condition of rigid connection is prevented, so that the circuit connection between the negative current collector and the battery cell is influenced, and the product quality of the battery is further influenced.

Description

Technical Field

[0001] The utility model relates to the technical field of battery structures, in particular to a negative electrode current collector and a battery. Background Art

[0002] The negative electrode current collector plate in a battery is primarily responsible for collecting and conducting electrons from the negative electrode material. When subjected to vibration, the welds between the battery cell and the negative electrode current collector plate may become desolderable, disconnecting the battery circuit and affecting battery quality. Utility Model Content

[0003] The purpose of the utility model is to provide a negative electrode current collector and a battery, wherein the negative electrode current collector is provided for electrically connecting the battery cells in the battery to the negative electrode current collector. During use of the negative electrode current collector, the through-hole is used to separate the second area into a fixed portion and an elastic portion. The opposite ends of the through-hole extend to form openings, so that the elastic portion can be movable relative to the fixed portion. When the negative electrode current collector vibrates, the elastic portion plays a buffering and elastic transition role, preventing the negative electrode current collector from being welded, desoldered, or falling off when rigidly connected, thereby affecting the circuit connectivity between the negative electrode current collector and the battery cells, avoiding disconnection of the battery circuit, and thus affecting the product quality of the battery.

[0004] A first aspect of the present invention provides a negative electrode current collector, which includes a first region and a second region.

[0005] a first region, wherein the first region is provided with a first through hole;

[0006] The second area is arranged around the outer peripheral side of the first area, and the second area is provided with multiple through-holes, and the opposite ends of any through-hole extend to form an opening, and the through-holes separate the second area into a fixed part and an elastic part, and one elastic part is located between two adjacent fixed parts.

[0007] In a possible embodiment of the present invention, the through-opening is a U-shaped structure, and the opening direction of the through-opening of the U-shaped structure faces the first area.

[0008] In a possible embodiment of the present invention, the number of the through openings is four, and the four through openings are symmetrically arranged and arranged around the circumference of the first through hole.

[0009] In a possible embodiment of the present invention, the first through hole is located at the center of the first area.

[0010] In a possible embodiment of the present invention, the second region further includes a plurality of welding portions, and any one of the welding portions is provided on one of the elastic portions.

[0011] In a possible embodiment of the present invention, the trajectory of the welding portion is a curved structure.

[0012] In a possible embodiment of the present invention, the fixing portion is provided with a second through hole, and one second through hole corresponds to one fixing portion.

[0013] In a possible embodiment of the present invention, a folded edge portion is provided at an edge of the second area away from the first area.

[0014] In a possible embodiment of the present invention, the first area is a circular structure, the second area is an annular structure, and the first area is located at the center of the second area of ​​the annular structure.

[0015] A second aspect of the present invention provides a battery, comprising the negative electrode current collector described in any one of the above embodiments.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a negative electrode current collector and a battery, wherein a negative electrode current collector is provided for electrically connecting the battery cells in the battery to the negative electrode current collector; during the use of the negative electrode current collector, the through-hole is used to separate the second area into a fixed portion and an elastic portion; the opposite ends of the through-hole extend to form openings, so that the elastic portion can be movable relative to the fixed portion; when the negative electrode current collector vibrates, the elastic portion plays a role of buffering and elastic transition, preventing the negative electrode current collector from being welded, desoldered or falling off when rigidly connected, affecting the circuit connectivity between the negative electrode current collector and the battery cells, avoiding circuit disconnection of the battery, and thus affecting the product quality of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 Schematic diagram of the structure of the negative electrode current collector provided in some embodiments of the present invention Figure 1 ;

[0019] Figure 2 Schematic diagram of the structure of the negative electrode current collector provided in some embodiments of the present invention Figure 2 ;

[0020] Figure 3 A schematic side view of the structure of a negative electrode current collector provided in some embodiments of the present invention;

[0021] Figure 4 Schematic diagram of the cross-sectional structure of the battery provided in some embodiments of the present invention Figure 1 ;

[0022] Figure 5 Schematic diagram of the cross-sectional structure of the battery provided in some embodiments of the present invention Figure 2 .

[0023] Description of main component symbols;

[0024] 100 - negative electrode current collector; 110 - first region; 111 - first through hole; 120 - second region; 121 - through opening; 1211 - opening; 122 - fixing portion; 1221 - second through hole; 123 - elastic portion; 124 - welding portion; 125 - folded edge portion; 200 - battery; 210 - battery cell; 220 - housing; 230 - cover. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0029] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0030] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0032] Example 1

[0033] In the related art, when the negative electrode current collecting plate is subjected to vibration, the welding position between the battery cell and the negative electrode current collecting plate may become desoldering, causing the battery circuit to be disconnected, thereby affecting the product quality of the battery.

[0034] To solve the above problems, refer to Figure 1 As shown, an embodiment of the present application provides a negative electrode current collector 100 , which includes a first region 110 and a second region 120 .

[0035] Specifically, if Figure 1As shown, the first region 110 is provided with a first through hole 111; the second region 120 is arranged around the outer periphery of the first region 110, and the second region 120 is provided with a plurality of through holes 121, and the opposite ends of any through hole 121 extend to form an opening 1211, and the through hole 121 separates the second region 120 into a fixed portion 122 and an elastic portion 123, and one elastic portion 123 is located between two adjacent fixed portions 122, and a negative electrode current collector 100 is provided for electrically connecting the battery cell 210 in the battery 200 to the negative electrode current collector 100, During the use of the current collector 100, the through-hole 121 is used to separate the second area 120 into a fixed portion 122 and an elastic portion 123. The opposite ends of the through-hole 121 extend to form openings 1211, so that the elastic portion 123 can be movable relative to the fixed portion 122. When the negative current collector 100 vibrates, the elastic portion 123 plays a buffering and elastic transition role, preventing the negative current collector 100 from being welded, desoldered, or falling off when rigidly connected, affecting the circuit connectivity between the negative current collector 100 and the battery cell 210, and avoiding circuit disconnection of the battery 200.

[0036] In one embodiment, optionally, reference Figure 1 As shown, the through-hole 121 is a "U"-shaped structure, and the opening 1211 of the through-hole 121 of the "U"-shaped structure is directed toward the first area 110. Accordingly, the vertical projection shape of the through-hole 121 on the negative current collector 100 is a "U"-shaped structure. The through-hole 121 of the "U"-shaped structure can achieve a buffering and elastic transition effect on the negative current collector 100 when the negative current collector 100 vibrates. The opening 1211 of the through-hole 121 is directed toward the first area 110. The connection between the elastic part 123 and the fixed part 122 is achieved through the position of the opening 1211 of the through-hole 121. The elastic part 123 in the through-hole 121 can be relatively movable to prevent the negative current collector 100 from being welded, desoldered, or falling off.

[0037] Optionally, there are four through-holes 121 , which are symmetrically arranged and arranged around the circumference of the first through-hole 111 . The four through-holes 121 form a plurality of elastic portions 123 , and the negative electrode current collector 100 functions better in buffering and elasticity through the joint action of the plurality of elastic portions 123 .

[0038] In one embodiment, optionally, the fixing portion 122 is provided with a second through hole 1221, and one second through hole 1221 corresponds to one fixing portion 122. Accordingly, the fixing portion 122 can be fixed and limited by the second through hole 1221, so that the negative electrode current collector 100 can be installed by welding and fixing, thereby reducing the occurrence of short circuit or open circuit during the use of the negative electrode current collector 100.

[0039] Based on any of the above embodiments, optionally, refer to Figure 1 and Figure 2 As shown, the first area 110 is a circular structure, the second area 120 is an annular structure, the first area 110 is located at the center of the second area 120 of the annular structure, and the elastic portion 123 is used to separate the first area 110 and the second area 120. The elastic portion 123 can achieve a certain adjustment function in part of the second area 120, and the elastic portion 123 is located on the circumference of the first area 110 of the circular structure.

[0040] In summary, the negative electrode current collector 100 is used to electrically connect the battery cell 210 in the battery 200 with the negative electrode current collector 100. During the use of the negative electrode current collector 100, the through-hole 121 is used to separate the second area 120 into a fixed portion 122 and an elastic portion 123. The opposite ends of the through-hole 121 extend to form openings 1211, so that the elastic portion 123 can be movable relative to the fixed portion 122. When the negative electrode current collector 100 vibrates, the elastic portion 123 plays a buffering and elastic transition role, preventing the negative electrode current collector 100 from being welded, desoldered, or falling off when the negative electrode current collector 100 is rigidly connected, affecting the circuit connectivity between the negative electrode current collector 100 and the battery cell 210, avoiding circuit disconnection of the battery 200, and further affecting the product quality of the battery 200.

[0041] Example 2

[0042] refer to Figures 1 to 3 As shown, an embodiment of the present application provides another negative electrode current collector 100 , which includes a first region 110 and a second region 120 .

[0043] Specifically, if Figure 1 As shown, the first region 110 is provided with a first through hole 111 ; the second region 120 is arranged around the outer periphery of the first region 110 , and the negative electrode current collector 100 is provided to electrically connect the battery cell 210 in the battery 200 with the negative electrode current collector 100 .

[0044] In this embodiment, the second region 120 is provided with a plurality of through-holes 121, and the opposite ends of any one of the through-holes 121 extend to form openings 1211, and the through-holes 121 separate the second region 120 into a fixed portion 122 and an elastic portion 123, and one elastic portion 123 is located between two adjacent fixed portions 122. During use of the negative current collector 100, the through-holes 121 are used to separate the second region 120 into the fixed portion 122 and the elastic portion 123, and the opposite ends of the through-holes 121 extend to form openings 1211, so that the elastic portion 123 can be movable relative to the fixed portion 122. When the negative current collector 100 vibrates, the elastic portion 123 plays a role of buffering and elastic transition, thereby preventing the negative current collector 100 from being welded, desoldered, or falling off when rigidly connected, thereby affecting the circuit connectivity between the negative current collector 100 and the battery cell 210, and avoiding circuit disconnection of the battery 200.

[0045] In one embodiment, optionally, reference Figure 1 As shown, the through-opening 121 is a U-shaped structure, with the opening 1211 of the U-shaped through-opening 121 facing the first region 110. Accordingly, the vertical projection of the through-opening 121 on the negative electrode current collector 100 is a U-shaped structure. The U-shaped through-opening 121 can provide a buffer and elastic transition for the negative electrode current collector 100 when the negative electrode current collector 100 vibrates. The opening 1211 of the through-opening 121 faces the first region 110. The position of the opening 1211 of the through-opening 121 establishes a connection between the elastic portion 123 and the fixing portion 122. The elastic portion 123 within the through-opening 121 is relatively movable, preventing the negative electrode current collector 100 from welding, desoldering, or falling off. For example, the through-opening 121 can also adopt a similar semi-enclosed structure, such as a C-shaped structure or a V-shaped structure.

[0046] Optionally, there are four through-holes 121, symmetrically arranged around the circumference of the first through-hole 111. The four through-holes 121 form a plurality of elastic portions 123. The combined action of the elastic portions 123 provides the negative electrode current collector 100 with improved cushioning and elasticity. Furthermore, each through-hole 121 corresponds to one elastic portion 123. Of course, the number of through-holes 121 is not limited to this; the number of through-holes 121 can also be two, six, eight, etc.

[0047] In one embodiment, optionally, reference Figure 1As shown, the first through hole 111 is located at the center of the first area 110 . The first through hole 111 is used to assist in welding the battery 200 , so as to facilitate welding of the positive current collector and the positive electrode sheet through the first through hole 111 .

[0048] In one embodiment, optionally, in combination Figure 1 and Figure 2 As shown, the second region 120 further includes a plurality of welding portions 124, any one of the welding portions 124 being arranged on one of the elastic portions 123. Accordingly, each of the welding portions 124 is located on one of the elastic portions 123. The position of the welding portion 124 is used to realize welding of the negative electrode current collector 100 and the battery 200 components, and the elastic portion 123 provides the negative electrode current collector 100 with a certain adjustment space during welding through the position of the welding portion 124, so that the position of the welding portion 124 can have a sufficient welding angle and welding area.

[0049] Alternatively, as Figure 2 As shown, the trajectory of the welding portion 124 is a curved structure. During welding, the position of the curved structure welding portion 124 increases the welding area of ​​the welding portion 124 and reduces the resistance of the battery 200 components connecting to the negative electrode current collector 100, which has a better technical effect.

[0050] In one embodiment, optionally, the fixing portion 122 is provided with a second through hole 1221, and one second through hole 1221 corresponds to one fixing portion 122. Accordingly, the fixing portion 122 can be fixed and limited by the second through hole 1221, so that the negative electrode current collector 100 can be installed by welding and fixing, thereby reducing the occurrence of short circuit or open circuit during the use of the negative electrode current collector 100.

[0051] In one embodiment, optionally, reference Figure 3 As shown, a folded edge portion 125 is provided at an edge position of the second region 120 away from the first region 110, so as to achieve a larger contact surface when assembling the negative electrode current collector 100 and other components of the battery 200, thereby improving the performance of the conductor. In addition, the folded edge portion 125 can enhance the mechanical strength of the negative electrode current collector 100, so as to facilitate the folded edge portion 125 of the second region 120 to limit and install the negative electrode current collector 100, thereby preventing the negative electrode current collector 100 from moving or misaligning during the assembly process of the battery 200, and having a better technical effect. The folded edge portion 125 can also play a certain sealing role to prevent leakage of the electrolyte in the battery 200.

[0052] Based on any of the above embodiments, optionally, refer to Figure 1 and Figure 2As shown, the first area 110 is a circular structure, the second area 120 is an annular structure, the first area 110 is located at the center of the second area 120 of the annular structure, and the elastic portion 123 is used to separate the first area 110 and the second area 120. The elastic portion 123 can achieve a certain adjustment function in part of the second area 120, and the elastic portion 123 is located on the circumference of the first area 110 of the circular structure.

[0053] Based on any of the above embodiments, optionally, the first region 110 and the second region 120 are both made of copper, and the first region 110 and the second region 120 of the negative electrode current collector 100 are made of copper. The negative electrode current collector 100 made of copper is used to collect and transmit the current generated by the negative electrode, so that the negative electrode current collector 100 has better conductivity and machinability, better ductility and toughness, is easy to process and manufacture into the shape and structure of the negative electrode current collector 100, and has strong corrosion resistance and thermal stability.

[0054] Example 3

[0055] The embodiment of the present utility model further provides a battery 200, referring to Figure 4 and Figure 5 As shown, battery 200 includes a housing 220, a cover 230, and a cell 210. Housing 220 is connected to cover 230 and defines a cavity, within which cell 210 is mounted. Battery 200 also includes the negative electrode current collector 100 of Example 1 or Example 2. Negative electrode current collector 100 is connected to the side of cover 230 proximal to cell 210, i.e., negative electrode current collector 100 is located between cell 210 and cover 230. Battery 200 including negative electrode current collector 100 has all the benefits of negative electrode current collector 100, and will not be described in detail here. For example, battery 200 can be sealed using laser welding or crimping.

[0056] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not limiting, and thus other examples of the exemplary embodiments may have different values.

[0057] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the scope of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A negative electrode current collector, characterized in that: include: a first region, wherein the first region is provided with a first through hole; The second area is arranged around the outer peripheral side of the first area, and the second area is provided with multiple through-holes, and the opposite ends of any through-hole extend to form an opening, and the through-holes separate the second area into a fixed part and an elastic part, and one elastic part is located between two adjacent fixed parts.

2. The negative electrode current collector according to claim 1, characterized in that: The through opening is a U-shaped structure, and the opening direction of the through opening of the U-shaped structure faces the first area.

3. The negative electrode current collector according to claim 2, characterized in that: The number of the through openings is four, and the four through openings are symmetrically arranged and arranged around the circumference of the first through hole.

4. The negative electrode current collector according to claim 3, characterized in that: The first through hole is located at the center of the first area.

5. The negative electrode current collector according to claim 1, characterized in that: The second region further includes a plurality of welding portions, and any one of the welding portions is provided on one of the elastic portions.

6. The negative electrode current collector according to claim 5, characterized in that: The trajectory of the welding portion is a curved structure.

7. The negative electrode current collector according to claim 5, characterized in that: The fixing portion is provided with a second through hole, and one second through hole corresponds to one fixing portion.

8. The negative electrode current collector according to claim 1, characterized in that: A folded edge portion is provided at an edge of the second region away from the first region.

9. The negative electrode current collector according to any one of claims 1 to 8, characterized in that: The first area is a circular structure, the second area is an annular structure, and the first area is located at the center of the second area of ​​the annular structure.

10. A battery, characterized in that: The negative electrode current collector comprises the negative electrode current collector according to any one of claims 1 to 9.

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