Collector piece assembly and cylindrical battery

Abstract

The utility model provides a current collector assembly and a cylindrical battery. The current collecting piece assembly comprises a connecting cover, a first connecting piece, a second connecting piece, a first fusing arm, a second fusing arm and a current collecting disc. A liquid injection hole and a pressure relief hole are formed in the connecting cover, the two ends of the first connecting piece are connected to the connecting cover and the second connecting piece respectively, the two ends of the first fusing arm are connected to the second connecting piece and the flow collecting disc respectively, and the two ends of the second fusing arm are connected to the second connecting piece and the flow collecting disc respectively. A pressure relief receding hole is formed among the first fusing arm, the second connecting piece, the flow collecting disc and the second fusing arm, a liquid inlet receding hole is further formed in one side of the flow collecting disc and located below the liquid injection hole, and the pressure relief receding hole is formed below the pressure relief hole. The pressure relief avoiding hole directly faces the pressure relief hole, so that the gas circulation speed is higher, the liquid inlet avoiding hole directly faces the liquid injection hole, so that the electrolyte injection speed is increased, the first fusing arm and the second fusing arm are fused during short circuit, and the safety of the current collector assembly is improved.

Description

Technical Field

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

[0002] With the development of the new energy industry, the use of large cylindrical tab-free batteries in the market has gradually increased. Large cylindrical batteries usually include a shell, a connection cover with a pole, and a collector assembly connected to a cell. The connection cover encapsulates the cell and the busbar assembly inside the battery.

[0003] Since the single cell capacity of large cylindrical batteries is large, there are safety hazards when thermal runaway or short circuit occurs in large cylindrical batteries. The current collector assembly is located below the injection hole, which easily blocks the electrolyte during injection, making the electrolyte injection speed slow, such as the technical solution disclosed in the comparative document CN201520431838.6. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a current collecting piece assembly and a cylindrical battery with fast liquid injection speed and fuse-out in case of short circuit.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] A current collecting plate assembly comprises a connecting cover, a first connecting plate, a second connecting plate, a first fuse arm, a second fuse arm and a current collecting plate; the connecting cover is provided with a liquid injection hole and a pressure relief hole, one end of the first connecting plate is connected to the connecting cover, the other end of the first connecting plate is connected to the second connecting plate, the two ends of the first fuse arm are respectively connected to the second connecting plate and the current collecting plate, the two ends of the second fuse arm are respectively connected to the second connecting plate and the current collecting plate, a pressure relief avoidance hole is formed between the first fuse arm, the second connecting plate, the current collecting plate and the second fuse arm, a liquid inlet avoidance hole is also provided on one side of the current collecting plate, the liquid inlet avoidance hole is located below the liquid injection hole, and the pressure relief avoidance hole is arranged below the pressure relief hole.

[0007] In one embodiment, the area of ​​the first fuse arm is the same as the area of ​​the second fuse arm.

[0008] In one embodiment, the connection cover is provided with a connection groove, and one end of the first connection piece is disposed in the connection groove.

[0009] In one of the embodiments, the connection cover is protrudingly provided with a positioning block, the positioning block is arranged in the connection groove, the first connection piece is provided with a positioning groove, and the positioning block is embedded in the positioning groove.

[0010] In one embodiment, the number of the positioning block and the positioning groove is two, and the two positioning grooves are respectively arranged on two sides of the first connecting piece.

[0011] In one embodiment, the first connecting piece is provided with a first bending groove and a second bending groove, and the first bending groove and the second bending groove are arranged in parallel on two sides of the first connecting piece.

[0012] In one embodiment, the first fuse arm is provided with a third bending groove, and the second fuse arm is provided with a fourth bending groove.

[0013] In one embodiment, the current collecting plate is further provided with a liquid passing hole, and the liquid passing hole is arranged at the center of the current collecting plate.

[0014] In one of the embodiments, the collecting plate is further provided with leakage holes, and the number of the leakage holes is multiple, and the multiple leakage holes are arranged at intervals along the circumference of the liquid passage hole.

[0015] A cylindrical battery comprises an outer shell, a connecting cover, an electrode, an explosion-proof valve and the current collecting sheet assembly described in any of the above embodiments, wherein the outer shell is provided with a receiving groove, the connecting cover is arranged on the receiving groove, the connecting cover is also provided with a connecting hole, one end of the electrode is passed through the connecting hole, the injection hole and the pressure relief hole are connected to the receiving groove, the explosion-proof valve is installed on the pressure relief hole, and one end of the first connecting sheet is connected to the end face of the electrode.

[0016] A cylindrical battery comprises the current collecting sheet assembly described in any one of the above embodiments.

[0017] Compared with the prior art, the utility model has at least the following advantages:

[0018] 1. The above-mentioned current collector assembly and cylindrical battery are bent so that the pressure relief hole is directly below the pressure relief hole. When the cylindrical battery is in thermal runaway, the gas quickly passes through the current collector from the pressure relief hole and the pressure relief hole, thereby avoiding the current collector blocking the air and making the internal gas flow faster.

[0019] 2. When injecting electrolyte, the liquid inlet avoidance hole of the current collecting plate is directly opposite to the bottom of the injection hole, so that the electrolyte can quickly pass through the current collecting plate, thereby increasing the injection speed of the electrolyte;

[0020] 3. When a short circuit occurs, the current of the first fuse arm and the second fuse arm increases, and the first fuse arm and the second fuse arm fuse, thereby preventing the short circuit of the current collector assembly and increasing the safety of the current collector assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, 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 utility model 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 creative work.

[0022] Figure 1 A schematic structural diagram of a current collecting sheet assembly according to an embodiment;

[0023] Figure 2 This is a schematic structural diagram of a cylindrical battery according to an embodiment;

[0024] Figure 3 for Figure 2 Schematic diagram of the partial structure of the cylindrical battery shown. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings. The drawings provide preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thoroughly and comprehensively understood.

[0026] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[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 "and / or" used herein includes any and all combinations of one or more related listed items.

[0028] In order to better understand the technical solutions and beneficial effects of the present application, the present application is further described in detail below in conjunction with specific embodiments:

[0029] like Figures 1 to 3As shown, a current collecting piece assembly 10a of an embodiment includes a connection cover 100, a first connection piece 200, a second connection piece 300, a first fuse arm 400, a second fuse arm 500 and a current collecting plate 600, wherein the connection cover 100 is provided with a liquid injection hole 101 and a pressure relief hole 102, one end of the first connection piece 200 is connected to the connection cover 100, the other end of the first connection piece 200 is connected to the second connection piece 300, the two ends of the first fuse arm 400 are respectively connected to the second connection piece 300 and the current collecting plate 600, and the second fuse arm 500 is connected to the second connection piece 300. The two ends of 00 are respectively connected to the second connecting piece 300 and the current collecting plate 600, the first fuse arm 400 and the second fuse arm 500 are aluminum strips, one side of the current collecting plate 600 is welded to the battery core, the first fuse arm 400, the second connecting piece 300, the current collecting plate 600 and the second fuse arm 500 are connected in sequence to form a pressure relief avoidance hole 501, and a liquid inlet avoidance hole 601 is also opened on one side of the current collecting plate 600. The liquid inlet avoidance hole 601 is located below the liquid injection hole 101, and the pressure relief avoidance hole 501 is arranged below the pressure relief hole 102.

[0030] In this embodiment, the first connecting piece 200, the second connecting piece 300, the first fuse arm 400, the second fuse arm 500 and the current collecting plate 600 are welded in sequence, the first connecting piece 200 and the second connecting piece 300 are bent, and one end of the first fuse arm 400 and the second fuse arm 500 are bent with the current collecting plate 600, so that the pressure relief avoidance hole 501 is bent to face the bottom of the pressure relief hole 102, and the gas can quickly enter the pressure relief hole 102 through the pressure relief avoidance hole 501, and the liquid inlet of the current collecting plate 600 The avoidance hole 601 is directly opposite to the bottom of the injection hole 101, and the electrolyte passes through the injection hole 101 and the liquid inlet avoidance hole 601 in sequence; when a short circuit occurs in the current collecting plate assembly 10a, the current enters the pole 300 and passes through the first connecting plate 200, the second connecting plate 300, the first fuse arm 400, the second fuse arm 500 and the current collecting plate 600 in sequence, and the current of the first fuse arm 400 and the second fuse arm 500 increases, causing the first fuse arm 400 and the second fuse arm 500 to generate high temperature and fuse.

[0031] In the above-mentioned current collecting plate assembly 10a, the pressure relief avoidance hole 501 is directly opposite to the bottom of the pressure relief hole 102 after bending. When thermal runaway occurs, the gas quickly passes through the current collecting plate 600 from the pressure relief avoidance hole 501 and the pressure relief hole 102, avoiding the current collecting plate 600 from blocking the air, making the internal gas flow faster; when injecting electrolyte, the liquid inlet avoidance hole 601 of the current collecting plate 600 is directly opposite to the bottom of the injection hole 101, so that the electrolyte can quickly pass through the current collecting plate 600, thereby increasing the injection speed of the electrolyte; when a short circuit occurs, the current of the first fuse arm 400 and the second fuse arm 500 increases, and the first fuse arm 400 and the second fuse arm 500 are blown, preventing the short circuit of the current collecting plate assembly 10a and increasing the safety of the current collecting plate assembly 10a.

[0032] like Figure 1 As shown, in one embodiment, the area of ​​the first fuse arm 400 is the same as the area of ​​the second fuse arm 500. In this embodiment, the first fuse arm 400 and the second fuse arm 500 are evenly connected to the second connecting piece 300 and the current collecting plate 600, so that the second connecting piece 300 and the current collecting plate 600 maintain a certain connection strength with the first fuse arm 400 and the second fuse arm 500, so that the first fuse arm 400 and the second fuse arm 500 are not easy to break when bent.

[0033] like Figure 1 As shown, in one embodiment, the connection cover 100 is provided with a connection groove 103, and one end of the first connection piece 200 is disposed in the connection groove 103. In this embodiment, the first connection piece 200 is installed in the connection groove 103, and the connection groove 103 protects the first connection piece 200, reduces the collision of the first connection piece 200 during the assembly process, and makes the connection between the first connection piece 200 and the pole 300 tight.

[0034] like Figure 1 As shown, in one embodiment, the connection cover 100 is provided with a convex positioning block 110, the positioning block 110 is arranged in the connection groove 103, the first connection piece 200 is provided with a positioning groove 201, and the positioning block 110 is embedded in the positioning groove 201. In this embodiment, the positioning block 110 is embedded in the positioning groove 201, so that the first connection piece 200 is limited by the positioning block 110, thereby preventing the first connection piece 200 from shaking and being damaged during the assembly process.

[0035] like Figure 1 As shown, in one embodiment, the number of the positioning blocks 110 and the positioning grooves 201 is two, and the two positioning grooves 201 are respectively arranged on both sides of the first connecting piece 200. In this embodiment, the two positioning blocks 110 are simultaneously embedded in the two positioning grooves 201, so that the first connecting piece 200 is limited by the two positioning blocks 110, so that the position of the first connecting piece 200 is fixed, thereby further reducing the problem of shaking of the first connecting piece 200.

[0036] like Figure 1 As shown, in one embodiment, the first connecting piece 200 is provided with a first bending groove 202 and a second bending groove 203, and the first bending groove 202 and the second bending groove 203 are parallelly arranged on both sides of the first connecting piece 200. In this embodiment, the first connecting piece 200 is cut to form the first bending groove 202 and the second bending groove 203, so that a bending portion that is easy to bend is formed between the first bending groove 202 and the second bending groove 203, and the first bending groove 202 and the second bending groove 203 can mark the bending position of the first connecting piece 200, so that each first connecting piece 200 can be bent at the same position.

[0037] like Figure 1 As shown, in one embodiment, the first fuse arm 400 is provided with a third bending groove 401, and the second fuse arm 500 is provided with a 502. In this embodiment, the first fuse arm 400 and the second fuse arm 500 are respectively formed by cutting to form the third bending grooves 401 and 502, so that the first fuse arm 400 and the second fuse arm 500 are easy to bend, and the first fuse arm 400 and the second fuse arm 500 form a minimum cross-section connection. When a short circuit occurs in the current collecting piece assembly 10a, the first fuse arm 400 and the second fuse arm 500 are easy to fuse at the minimum cross-section connection, thereby increasing the internal resistance of the current collecting piece assembly 10a and improving the safety of the current collecting piece assembly 10a.

[0038] like Figure 1 As shown, in one embodiment, the current collecting plate 600 is further provided with a liquid passing hole 602, and the liquid passing hole 602 is arranged at the center of the current collecting plate 600. In this embodiment, when injecting electrolyte, the liquid passing hole 602 increases the liquid passing channel, making it easier for the electrolyte to pass through the current collecting plate 600, thereby accelerating the injection speed of the electrolyte.

[0039] like Figure 1 As shown, in one embodiment, the current collecting plate 600 is further provided with a plurality of leakage holes 603, and the plurality of leakage holes 603 are arranged at intervals along the circumference of the liquid passage hole 602. In this embodiment, the leakage holes 603 increase the number of liquid passage channels for the electrolyte to pass through the current collecting plate 600, thereby accelerating the speed at which the electrolyte passes through the current collecting plate 600.

[0040] like Figure 2 and Figure 3 As shown, the present application also provides a cylindrical battery 10, comprising a housing 10b, a pole 10c, an explosion-proof valve 10d, and a current collecting piece assembly 10a in any of the above embodiments, wherein the housing 10b is provided with a receiving groove 104, a connecting cover 100 is provided on the receiving groove 104, and a connecting hole 105 is provided on the connecting cover 100, one end of the pole 10c is passed through the connecting hole 105, a liquid injection hole 101 and a pressure relief hole 102 are connected to the receiving groove 104, an explosion-proof valve 10d is installed on the pressure relief hole 102, and one end of the first connecting piece 200 is connected to the end face of the pole 10c. In this embodiment, through the current collecting piece assembly 10a, when the cylindrical battery 10 is short-circuited, the first fuse arm 400 and the second fuse arm 500 in the receiving groove 104 are melted, thereby preventing the cylindrical battery 10 from short-circuiting, thereby improving the safety of the cylindrical battery 10.

[0041] Compared with the prior art, the utility model has at least the following advantages:

[0042] 1. In the above-mentioned current collecting plate assembly 10a and cylindrical battery 10, the bent pressure relief hole 501 is directly opposite to the bottom of the pressure relief hole 102. When the cylindrical battery 10 has thermal runaway, the gas quickly passes through the current collecting plate 600 from the pressure relief hole 501 and the pressure relief hole 102, avoiding the current collecting plate 600 from blocking the air, making the internal gas flow faster;

[0043] 2. When injecting electrolyte, the liquid inlet avoidance hole 601 of the current collecting plate 600 is directly opposite to the bottom of the injection hole 101, so that the electrolyte can quickly pass through the current collecting plate 600, thereby increasing the injection speed of the electrolyte;

[0044] 3. When a short circuit occurs, the current of the first fuse arm 400 and the second fuse arm 500 increases, and the first fuse arm 400 and the second fuse arm 500 are fused, thereby preventing the short circuit of the current collecting piece assembly 10a and increasing the safety of the current collecting piece assembly 10a.

[0045] 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 current collecting sheet assembly, characterized in that: It includes a connecting cover, a first connecting piece, a second connecting piece, a first fuse arm, a second fuse arm and a current collecting plate; the connecting cover is provided with a liquid injection hole and a pressure relief hole, one end of the first connecting piece is connected to the connecting cover, the other end of the first connecting piece is connected to the second connecting piece, the two ends of the first fuse arm are respectively connected to the second connecting piece and the current collecting plate, the two ends of the second fuse arm are respectively connected to the second connecting piece and the current collecting plate, a pressure relief avoidance hole is formed between the first fuse arm, the second connecting piece, the current collecting plate and the second fuse arm, a liquid inlet avoidance hole is also provided on one side of the current collecting plate, the liquid inlet avoidance hole is located below the liquid injection hole, and the pressure relief avoidance hole is arranged below the pressure relief hole.

2. The current collecting sheet assembly according to claim 1, characterized in that: The area of ​​the first fuse arm is the same as the area of ​​the second fuse arm.

3. The current collecting sheet assembly according to claim 1, characterized in that: The connection cover is provided with a connection groove, and one end of the first connection piece is arranged in the connection groove.

4. The current collecting piece assembly according to claim 3, characterized in that: The connection cover is convexly provided with a positioning block, and the positioning block is arranged in the connection groove. The first connection piece is provided with a positioning groove, and the positioning block is embedded in the positioning groove.

5. The current collecting piece assembly according to claim 4, characterized in that: The number of the positioning blocks and the positioning grooves is two, and the two positioning grooves are respectively arranged on both sides of the first connecting piece.

6. The current collecting sheet assembly according to claim 1, characterized in that: The first connecting piece is provided with a first bending groove and a second bending groove, and the first bending groove and the second bending groove are arranged in parallel on two sides of the first connecting piece.

7. The current collecting sheet assembly according to claim 1, characterized in that: The first fuse arm is provided with a third bending groove, and the second fuse arm is provided with a fourth bending groove.

8. The current collecting sheet assembly according to claim 1, characterized in that: The collecting plate is also provided with a liquid passing hole, and the liquid passing hole is arranged at the center of the collecting plate.

9. The current collecting piece assembly according to claim 8, characterized in that: The collecting plate is also provided with leakage holes, and the number of the leakage holes is multiple, and the multiple leakage holes are arranged at intervals along the circumference of the liquid passage hole.

10. A cylindrical battery, characterized in that: It includes a shell, a connecting cover, a pole, an explosion-proof valve and a current collecting plate assembly according to any one of claims 1 to 9, the shell is provided with a receiving groove, the connecting cover is arranged on the receiving groove, the connecting cover is also provided with a connecting hole, one end of the pole is passed through the connecting hole, the injection hole and the pressure relief hole are connected to the receiving groove, the explosion-proof valve is installed on the pressure relief hole, and one end of the first connecting plate is connected to the end face of the pole.

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