Collecting plate and battery

Abstract

The current collecting disc comprises a current collecting disc body, the current collecting disc body is provided with a through hole and a plurality of hollowed-out grooves arranged in the circumferential direction of the through hole, a connecting part is formed between the hollowed-out grooves and the through hole, and the width of the connecting part is 0.1-2mm. According to the collector plate disclosed by the utility model, the connecting part between the hollow groove and the through hole is subjected to weak treatment, and the width of the connecting part is controlled to be 0.1-2mm, so that the connecting part meets the overall strength of the collector plate body, the connecting part cannot be broken when a battery cell is normally expanded, and the connecting part can be broken in time when the battery cell is subjected to thermal runaway expansion, so that the service life of the collector plate is prolonged. And the collector plate can be opened from the through hole and the hollow groove, so that directional eruption of thermal runaway of the battery cell is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting plate and a battery. Background Art

[0002] In recent years, with the increase in the penetration rate of new energy electric vehicles, power lithium battery combustion and recalls due to battery failure have occurred frequently, and consumers' attention to electric vehicles has gradually shifted from "range anxiety" to "safety anxiety". The vast majority of electric vehicle safety accidents are caused by battery thermal runaway, and the safety of power lithium batteries has become a "stumbling block" for the development of the electric vehicle industry. In terms of the current collector structure, the overall structural strength is high, which limits the directional eruption of the core when the battery cell thermal runaway occurs. Utility Model Content

[0003] Based on this, it is necessary to provide a current collector and a battery to address the current collector's overall structural strength in the battery cell structure, and to limit the directional eruption of the winding core when the battery cell has thermal runaway.

[0004] The utility model provides a current collecting plate, comprising a current collecting plate body, the current collecting plate body is provided with a through hole and a plurality of hollow grooves arranged circumferentially around the through hole, a connecting portion is formed between the hollow groove and the through hole, and the width of the connecting portion is 0.1-2 mm.

[0005] The current collecting disk of the utility model weakens the connection between the hollow groove and the through hole, and controls the width of the connection to be 0.1-2mm, so that the setting of the connection meets the overall strength of the current collecting disk body. When the battery cell expands normally, the connection will not break. When the battery cell expands under thermal runaway, the connection can break in time, so that the current collecting disk can open from the through hole and the hollow groove, thereby realizing the directional eruption of thermal runaway of the battery cell.

[0006] As a further improvement of the above solution of the utility model, a welding portion is formed between any two adjacent hollow grooves, and the thickness of the connecting portion is smaller than the thickness of the welding portion.

[0007] As a further improvement of the above solution of the utility model, the inner wall of the through hole and the positions corresponding to each hollow groove are both recessed to form a groove, and a connecting portion is formed between the groove and the corresponding hollow groove.

[0008] As a further improvement of the above solution of the utility model, the hollow groove is a groove body with a rectangular structure.

[0009] As a further improvement of the above solution of the utility model, the number of the hollow grooves is three.

[0010] As a further improvement of the above solution of the utility model, a plurality of notches are provided on the edge of the collecting plate body.

[0011] As a further improvement of the above solution of the utility model, a plurality of notches are respectively arranged in one-to-one correspondence with a plurality of hollow grooves.

[0012] As a further improvement of the above solution of the utility model, the collecting disc body is in a disc-shaped structure, and the through hole is coaxially arranged with the collecting disc body.

[0013] As a further improvement of the above solution of the utility model, the hollow grooves are arranged along the radial direction of the collecting plate body.

[0014] The utility model provides a battery, which comprises the current collecting plate as mentioned above.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The current collecting disk of the utility model weakens the connection between the hollow groove and the through hole, and controls the width of the connection to be 0.1-2mm, so that the setting of the connection meets the overall strength of the current collecting disk body. When the battery cell expands normally, the connection will not break. When the battery cell expands under thermal runaway, the connection can break in time, so that the current collecting disk can open from the through hole and the hollow groove, thereby realizing the directional eruption of thermal runaway of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic structural diagram of a current collecting plate proposed in an embodiment of the utility model.

[0018] Figure numerals: 1, collecting plate body; 11, through hole; 12, hollow groove; 13, connecting part; 14, welding part; 15, groove; 16, notch. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] Reference Figure 1 The present embodiment provides a current collecting plate, especially a negative electrode current collecting plate, for use in cylindrical batteries, including a current collecting plate body 1.

[0021] The outer contour of the current collecting plate body 1 generally matches the inner contour of the shell of the cylindrical battery. Since the shell of the cylindrical battery is cylindrical, the current collecting plate body 1 in this embodiment is also circular or substantially circular.

[0022] A through hole 11 is coaxially formed in the middle of the collecting plate body 1. The inner wall of the through hole 11 is circumferentially recessed to form three grooves 15. The grooves 15 are square-sectioned groove structures, and the distances between any two adjacent grooves 15 are equal.

[0023] Three hollow grooves 12 are provided on the disc surface of the collector disc body 1. The three hollow grooves 12 are evenly distributed around the through hole 11 and arranged along the radial direction of the collector disc body 1. A welding portion 14 for welding with the pole ear is formed between any two adjacent hollow grooves 12 on the collector disc body 1, so that the collector disc forms a three-petal structure. The three hollow grooves 12 are respectively arranged in one-to-one correspondence with the three grooves 15. The hollow grooves 12 are grooves 15 with a rectangular cross-section, and the width of the hollow grooves 12 matches the width of the corresponding grooves 15. The corresponding hollow grooves 12 and grooves 15 cooperate to form a connecting portion 13, the thickness of the connecting portion 13 is less than the thickness of the welding portion 14, and the width of the connecting portion 13 is 0.1-2mm. In this embodiment, the width of the connecting portion is specifically 0.2mm. The three-petal type can ensure the flatness after processing through the connecting portions 13 between each other, which is conducive to the welding of the collector disc and the pole ear.

[0024] The edge of the collector plate body 1 is also provided with three notches 16, which are arranged at equal intervals in the circumferential direction of the edge of the collector plate body 1, and the three notches 16 are arranged one by one corresponding to the three hollow grooves 12. The provision of the notches 16 can enhance the elastic deformation capability of the collector plate body 1 as a whole, and at the same time, the multiple notches 16 can also provide clamping points, thereby facilitating the handling and installation of the collector plate.

[0025] In this embodiment, the connection part 13 between the hollow groove 12 and the through hole 11 is weakened, and the width of the connection part 13 is controlled to 0.1-0.5mm, so that the setting of the connection part 13 satisfies the overall strength of the collector body 1. When the battery cell expands normally, the connection part 13 will not break, and when the battery cell expands under thermal runaway, the connection part 13 can break in time, so that the three-petal collector can open from the through hole 11 and the hollow groove 12, and realize the directional eruption of the thermal runaway of the battery cell. It should be emphasized that as long as the width of the connection part 13 of this embodiment is within the numerical range, the technical effect of this embodiment can be achieved by combining any conventional distance between the center of the connection part 13 and the through hole 11, the number of hollow grooves 12, and the size of the collector body 1.

[0026] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0027] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0028] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0029] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A collecting plate, characterized in that: The current collecting disc body (1) comprises a through hole (11) and a plurality of hollow grooves (12) arranged circumferentially around the through hole (11), a connecting portion (13) is formed between the hollow groove (12) and the through hole (11), and the width of the connecting portion (13) is 0.1-2 mm.

2. The collecting plate according to claim 1, characterized in that: A welding portion (14) is formed between any two adjacent hollow grooves (12), and the thickness of the connecting portion (13) is smaller than the thickness of the welding portion (14).

3. The collecting plate according to claim 1, characterized in that: The inner wall of the through hole (11) and the positions corresponding to the hollow grooves (12) are all recessed to form a groove (15), and a connecting portion (13) is formed between the groove (15) and the corresponding hollow groove (12).

4. The collecting plate according to claim 1, characterized in that: The hollow groove (12) is a groove body with a rectangular structure.

5. The collecting plate according to claim 1, characterized in that: The number of the hollow grooves (12) is three.

6. The collecting plate according to claim 1, characterized in that: A plurality of notches (16) are provided on the edge of the current collecting plate body (1).

7. The collecting plate according to claim 1, characterized in that: The plurality of notches (16) are respectively arranged in one-to-one correspondence with the plurality of hollow grooves (12).

8. The collecting plate according to claim 1, characterized in that: The current collecting disc body (1) is in a disc-shaped structure, and the through hole (11) is coaxially arranged with the current collecting disc body (1).

9. The collecting plate according to claim 8, characterized in that: The hollow grooves (12) are arranged along the radial direction of the current collecting plate body (1).

10. A battery, characterized in that: It comprises the collecting plate as claimed in any one of claims 1 to 9.

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