Secondary battery

Abstract

The utility model provides a secondary battery, which relates to the technical field of new energy, and comprises a top cover plate assembly, a battery cell assembly and a battery cell shell, the top cover plate assembly is provided with an insulation protection piece, and the insulation protection piece is arranged towards the battery cell assembly; the two ends, in the first direction, of the lower end face of the insulation protection piece are each provided with a first protruding part. The two ends, in the second direction, of the first protruding part are each provided with an air guide channel. According to the top cover plate assembly of the secondary battery provided by the utility model, the first lug boss of the insulating protection piece is provided with the gas guide channel; when a large amount of gas is generated in the secondary battery, the large amount of gas flows upwards along the gap between the battery cell assembly and the side wall of the battery cell shell, and when the gas is blocked by the first convex part, the gas can flow along the gas guide channel and flow to the pressure release valve of the top cover plate assembly, so that the exhaust efficiency of the secondary battery is improved, and the explosion probability of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of new energy, in particular to a secondary battery. Background Art

[0002] In existing secondary batteries, an insulating member is provided below the cover plate. Protrusions are provided on both sides of the insulating member to support the electrode assembly and prevent the electrode assembly from shaking.

[0003] When a secondary battery experiences thermal runaway or short circuit, a large amount of gas is produced inside the battery. The gas production from the side of the battery will be blocked by the protrusions of the insulating parts, resulting in obstructed gas discharge and low gas discharge efficiency. The probability of battery explosion due to untimely gas discharge increases. Utility Model Content

[0004] The purpose of the utility model is to provide a secondary battery to solve the technical problem that after a large amount of gas is generated inside the battery, the gas discharge is blocked and the gas discharge efficiency is low.

[0005] The utility model provides a secondary battery, comprising a top cover sheet assembly, a battery cell assembly and a battery cell shell; the battery cell assembly is assembled in the battery cell shell, and the top cover sheet assembly is assembled at the opening of the battery cell shell;

[0006] The top cover assembly has an insulating protective member, and the insulating protective member is arranged toward the battery core assembly;

[0007] A first protrusion is provided at both ends of the lower end surface of the insulating protection member in the first direction; and an air guide channel is provided at both ends of the first protrusion in the second direction;

[0008] The first protrusion has a first side wall, a second side wall, and a third side wall. The side wall of the first protrusion in the first direction away from the other first protrusion is the first side wall, the side walls at both ends of the first protrusion in the second direction are the second side walls, and the side wall of the first protrusion away from the first side wall is the third side wall.

[0009] One end of the air guide channel is arranged at the connection between the first side wall and the second side wall, and the other end is arranged on the third side wall;

[0010] The first direction is the length direction of the top cover sheet assembly, and the second direction is the width direction of the top cover sheet assembly.

[0011] In an optional embodiment, an upper exhaust groove corresponding to the first protrusion is provided on the upper end surface of the insulating protector, and a plurality of exhaust holes are provided on the lower end surface of the insulating protector, and the exhaust holes are connected to the upper exhaust groove.

[0012] In an optional embodiment, the insulating protector is provided with two second protrusions, the second protrusion is provided between the two first protrusions, and the two second protrusions are provided at both ends of the insulating protector in the second direction and are provided correspondingly;

[0013] An air release area is provided on the insulating protection member, and the air release area is provided between the two second protrusions.

[0014] In an optional embodiment, the top cover sheet assembly includes a top cover sheet body and an insulating protection member, and the insulating protection member is provided on the lower end surface of the top cover sheet body;

[0015] A first through-hole is provided on the insulating protective member, and a second through-hole corresponding to the first through-hole is provided on the top cover body;

[0016] A pole body is provided on the top cover sheet assembly, and the pole body is assembled in the first through hole and the second through hole, and one end of the pole body extends from the upper end of the top cover sheet assembly, and the other end extends from the lower end of the top cover sheet assembly.

[0017] In an optional embodiment, the pole body is connected to the battery cell assembly via a connecting piece.

[0018] In an optional embodiment, the battery cell assembly includes two battery cells, and the battery cells are wound battery cells.

[0019] In an optional embodiment, the connecting piece includes a main connecting piece, on which two branch connecting pieces are provided; the main connecting piece is used to be connected to the pole body, and the two branch connecting pieces are respectively connected to a pole ear of the battery cell.

[0020] The utility model provides a secondary battery top cover sheet assembly of the insulating protective member having a first protrusion with an air guide channel; when a large amount of gas is generated in the secondary battery, the large amount of gas flows upward along the gap between the battery cell assembly and the side wall of the battery cell shell; when the gas is blocked by the first protrusion, the gas can flow along the air guide channel to the pressure relief valve of the top cover sheet assembly, thereby improving the exhaust efficiency of the secondary battery and reducing the probability of battery explosion. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 An exploded view of a secondary battery provided by an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A schematic structural diagram of an insulating protective member of a secondary battery shown;

[0024] Figure 3 for Figure 2 A partial enlarged view of A of the insulating protection member shown;

[0025] Figure 4 for Figure 2 A schematic structural diagram of the insulating protection member from another angle is shown;

[0026] Figure 5 for Figure 1 A schematic structural diagram of a connecting piece of a secondary battery shown;

[0027] Figure 6 for Figure 1 Schematic diagram of the internal structure of the secondary battery shown;

[0028] Figure 7 for Figure 6 A partial enlarged view of B of the internal structure schematic diagram of the secondary battery shown.

[0029] Icons: 100-top cover assembly; 101-insulating protection part; 1011-first protrusion; 10111-exhaust hole; 10112-first side wall; 10113-second side wall; 10114-third side wall; 1012-air guide channel; 1013-second protrusion; 1014-air release area; 1015-upper exhaust groove; 102-top cover body; 200-battery cell shell; 300-battery cell assembly; 301-battery cell; 400-connecting piece; 401-main connecting piece; 402-branch connecting piece; 500-pole body. DETAILED DESCRIPTION

[0030] The terms "first", "second", "third", etc. are only used to distinguish and describe, and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0031] 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.

[0032] In the description of this application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the product of the application is usually placed when in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0033] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "install", "connected" and "connect" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be a connection between the internal parts of two elements.

[0034] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings.

[0035] Reference Figure 1-Figure 7 The present invention provides a secondary battery, comprising a top cover assembly 100, a battery cell assembly 300 and a battery cell shell 200; the battery cell assembly 300 is assembled in the battery cell shell 200, and the top cover assembly 100 is assembled at the opening of the battery cell shell 200;

[0036] The top cover assembly 100 has an insulating protection member 101, and the insulating protection member 101 is disposed toward the battery cell assembly 300;

[0037] A first protrusion 1011 is provided at both ends of the lower end surface of the insulating protection member 101 in the first direction; and an air guide channel 1012 is provided at both ends of the first protrusion 1011 in the second direction.

[0038] The first protrusion 1011 has a first side wall 10112, a second side wall 10113, and a third side wall. The side wall of the first protrusion 1011 in the first direction away from the other first protrusion 1011 is the first side wall 10112, the side walls at both ends of the first protrusion 1011 in the second direction are the second side walls 10113, and the side wall of the first protrusion 1011 away from the first side wall 10112 is the third side wall 10114.

[0039] One end of the air guide channel 1012 is provided at the connection between the first side wall 10112 and the second side wall 10113 , and the other end is provided on the third side wall 10114 ;

[0040] The first direction is the length direction of the top cover sheet assembly 100 , and the second direction is the width direction of the top cover sheet assembly 100 .

[0041] In some embodiments, the insulating protective part 101 of the top cover sheet assembly 100 of the secondary battery faces the battery cell assembly 300. When the battery cell assembly 300 is assembled into the battery cell shell 200, there is a gap between the outer wall of the battery cell assembly 300 and the inner wall of the battery cell shell 200. When the secondary battery has thermal runaway or short circuit, a large amount of gas is generated inside the battery, and the gas will flow upward along the gap; after the top cover sheet assembly 100 is assembled on the battery cell shell 200, the first protrusion 1011 can hinder the flow of gas, which is not conducive to the timely discharge of gas and increases the probability of battery explosion.

[0042] After the air guide channel 1012 is provided on the first protrusion 1011 , the gas flowing upward from the gap can flow to the air release valve of the top cover plate assembly 100 through the air guide channel 1012 , thereby improving the gas exhaust efficiency and reducing the probability of battery explosion.

[0043] A first protrusion 1011 is respectively provided on both sides of the first direction of the insulating protective member 101, wherein the first side wall 10112 and the second side wall 10113 of the first protrusion 1011 abut against the inner wall of the battery cell shell 200; one end of the air guide channel 1012 is provided at the connection between the first side wall 10112 and the second side wall 10113, and the other end is provided on the side of the first protrusion 1011 away from the inner wall of the battery cell shell 200; when the battery cell assembly 300 generates a large amount of gas, part of the gas is obstructed by the first protrusion 1011 when flowing upward, affecting the flow of the gas; after the air guide channel 1012 is provided on the first protrusion 1011, the gas flowing upward from the gap can enter the air guide channel 1012 and flow along the air guide channel 1012 to the pressure relief valve, which can effectively improve the gas discharge efficiency and reduce the probability of battery explosion.

[0044] Reference Figure 4 In an optional embodiment, an upper exhaust groove 1015 corresponding to the first protrusion 1011 is provided on the upper end surface of the insulating protection member 101, and a plurality of exhaust holes 10111 are provided on the lower end surface of the insulating protection member 101, and the exhaust holes 10111 are connected to the upper exhaust groove 1015.

[0045] Reference Figure 2 In an optional embodiment, two second protrusions 1013 are provided on the insulating protection member 101, and the second protrusion 1013 is provided between the two first protrusions 1011, and the two second protrusions 1013 are provided at both ends of the insulating protection member 101 in the second direction and are provided correspondingly;

[0046] An air release area 1014 is provided on the insulating protection member 101 , and the air release area 1014 is provided between the two second protrusions 1013 .

[0047] The insulating protective member 101 can generally be made of polypropylene, which is corrosion-resistant and hot-melt. The first protrusion 1011 and the second protrusion 1013 provided on the insulating protective member 101 are both used to support the battery cell assembly 300, which can effectively prevent the battery cell assembly 300 from shaking.

[0048] A gas relief area 1014 is provided on the insulating protection member 101 , that is, a plurality of through holes are provided in a partial area of ​​the insulating protection member 101 , and gas can flow from the gas relief area 1014 to the top cover sheet body 102 .

[0049] A vent valve is provided on the top cover body 102 . When the pressure inside the secondary battery is too high, the vent valve opens, and the gas inside the secondary battery flows through the vent area 1014 of the insulating protection member 101 to the vent valve and is discharged from the vent valve.

[0050] Reference Figure 6 and Figure 7 In an optional embodiment, the top cover sheet assembly 100 includes a top cover sheet body 102 and an insulating protection member 101, and the insulating protection member 101 is provided on the lower end surface of the top cover sheet body 102;

[0051] A first through-hole is provided on the insulating protective member 101, and a second through-hole corresponding to the first through-hole is provided on the top cover sheet main body 102;

[0052] A pole body 500 is provided on the top cover sheet assembly 100 , and the pole body 500 is assembled in the first through-hole and the second through-hole, and one end of the pole body 500 extends from the upper end of the top cover sheet assembly 100 , and the other end extends from the lower end of the top cover sheet assembly 100 .

[0053] The top cover sheet assembly 100 includes a top cover sheet main body 102 and an insulating protective member 101, wherein the insulating protective member 101 is arranged at the lower end of the top cover sheet main body 102, a first through-hole is arranged on the insulating protective member 101, and a second through-hole is arranged on the top cover sheet main body 102; the pole body 500 is inserted into the first through-hole and the second through-hole in sequence from one side of the insulating protective member 101; and both ends of the pole body 500 extend from both ends of the top cover sheet assembly 100.

[0054] In an optional embodiment, the pole body 500 is connected to the battery cell assembly 300 via a connecting piece 400 .

[0055] In an optional embodiment, the battery cell assembly 300 includes two battery cells 301 , and the battery cells 301 are wound battery cells 301 .

[0056] Reference Figure 5 In an optional embodiment, the connecting piece 400 includes a main connecting piece 401, on which two branch connecting pieces 402 are provided; the main connecting piece 401 is used to connect to the pole body 500, and the two branch connecting pieces 402 are respectively connected to a pole ear of the battery cell 301.

[0057] In some embodiments, the battery cell assembly 300 generally includes two battery cells 301. In order to enable a pole body 500 to be connected to the pole tabs of two battery cells 301 at the same time, the main connecting piece 401 of the connecting piece 400 is connected to the pole body 500, and the branch connecting piece 402 is connected to the pole tab; in this way, a pole body 500 is connected to the pole tabs of two battery cells 301 at the same time.

[0058] Two pole bodies 500 are provided on the top cover assembly 100, one pole body 500 is a positive pole, and the other pole body 500 is a negative pole. The positive pole is connected to the positive pole tabs of the two battery cells 301 through the connecting piece 400, and the negative pole is connected to the negative pole tabs of the two battery cells 301 through the connecting piece 400.

[0059] The first protrusion 1011 of the insulating protective member 101 of the top cover sheet assembly 100 of the secondary battery provided by the present invention has an air guide channel 1012; when a large amount of gas is generated in the secondary battery, a large amount of gas flows upward along the gap between the battery cell assembly 300 and the side wall of the battery cell shell 200. When blocked by the first protrusion 1011, the gas can flow along the air guide channel 1012 and flow to the pressure relief valve of the top cover sheet assembly 100, thereby improving the exhaust efficiency of the secondary battery and reducing the probability of battery explosion.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A secondary battery, characterized in that: It comprises a top cover sheet assembly (100), a battery cell assembly (300) and a battery cell shell (200); the battery cell assembly (300) is assembled in the battery cell shell (200), and the top cover sheet assembly (100) is assembled at the opening of the battery cell shell (200); The top cover assembly (100) has an insulating protective member (101), and the insulating protective member (101) is arranged toward the battery core assembly (300); A first protrusion (1011) is provided at both ends of the lower end surface of the insulating protection member (101) in a first direction; and an air guide channel (1012) is provided at both ends of the first protrusion (1011) in a second direction. The first protruding portion (1011) comprises a first side wall (10112), a second side wall (10113) and a third side wall; the side wall of the first protruding portion (1011) in the first direction away from the other first protruding portion (1011) is the first side wall (10112); the side walls at both ends of the first protruding portion (1011) in the second direction are the second side walls (10113); and the side wall of the first protruding portion (1011) away from the first side wall (10112) is the third side wall (10114); One end of the air guide channel (1012) is arranged at the connection between the first side wall (10112) and the second side wall (10113), and the other end is arranged on the third side wall (10114); The first direction is the length direction of the top cover sheet assembly (100), and the second direction is the width direction of the top cover sheet assembly (100).

2. The secondary battery according to claim 1, wherein An upper exhaust groove (1015) corresponding to the first protrusion (1011) is provided on the upper end surface of the insulating protection member (101), and a plurality of exhaust holes (10111) are provided on the lower end surface of the insulating protection member (101), and the exhaust holes (10111) are communicated with the upper exhaust groove (1015).

3. The secondary battery according to claim 1, wherein Two second protrusions (1013) are provided on the insulating protection member (101), the second protrusion (1013) is arranged between the two first protrusions (1011), and the two second protrusions (1013) are arranged at both ends of the insulating protection member (101) in the second direction and are arranged correspondingly; An air release area (1014) is provided on the insulating protection member (101), and the air release area (1014) is provided between the two second protrusions (1013).

4. The secondary battery according to claim 2, wherein: The top cover sheet assembly (100) comprises a top cover sheet main body (102) and an insulating protection member (101), and the insulating protection member (101) is arranged on the lower end surface of the top cover sheet main body (102); A first through-hole is provided on the insulating protective member (101), and a second through-hole corresponding to the first through-hole is provided on the top cover sheet body (102); A pole body (500) is provided on the top cover sheet assembly (100), the pole body (500) is assembled in the first through hole and the second through hole, and one end of the pole body (500) extends from the upper end of the top cover sheet assembly (100), and the other end extends from the lower end of the top cover sheet assembly (100).

5. The secondary battery according to claim 4, wherein The pole body (500) is connected to the battery cell assembly (300) via a connecting piece (400).

6. The secondary battery according to claim 5, characterized in that The battery core assembly (300) comprises two battery cores (301), and the battery cores (301) are wound battery cores (301).

7. The secondary battery according to claim 6, characterized in that The connecting piece (400) comprises a main connecting piece (401), on which two branch connecting pieces (402) are arranged; the main connecting piece (401) is used to connect to the pole body (500), and the two branch connecting pieces (402) are respectively connected to a pole ear of the battery cell (301).

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