CN206293535U - A kind of battery with high current defencive function - Google Patents

Abstract

The utility model discloses a battery with a large current protection function, which comprises a battery cell. The left and right ends of the top of the battery cell are respectively provided with a positive connecting piece and a negative connecting piece, and the positive connecting piece and the negative connecting piece are mutually They are connected through a battery cover plate with a large current protection structure; the positive connecting piece and the battery cover plate are electrically connected with each other and a fuse part is arranged between them; the negative connecting piece and the battery cover plate are not connected. Conductive connection and a pressure component is arranged between the two. The utility model discloses a battery with a large current protection function. The battery cover plate on the battery has a high current protection function, which can effectively protect the lithium ion battery, and at the same time, it is not easy to corrode the shell, so as to ensure the service life of the battery , and then improve the user's experience of using the battery product, which is conducive to improving the market application prospect of the battery manufacturer's product.

Description

A battery with high current protection function

technical field

The utility model relates to the technical field of battery manufacturing, in particular to a battery with a large current protection function.

Background technique

At present, China is developing at a high speed, and rapid development cannot be separated from energy. However, the human settlement reserve of traditional energy in my country is at a relatively low level in the world, which is far from meeting the needs of later development. Petroleum, which is the main energy source in our country, will be used up in the next 50 years according to the current consumption rate according to incomplete statistics. In terms of environmental pollution, coal and petroleum are not only inefficient, but also emit a large amount of gas that pollutes the environment. Therefore, my country urgently needs to find and implement new types of efficient and clean energy to meet the needs of development. Lithium-ion batteries came into being in this environment.

At present, lithium-ion batteries have the advantages of safety, high efficiency, no pollution, high specific energy, abundant raw materials, many cycles, and long storage time, and are widely used not only in portable electronic devices such as mobile phones, digital cameras, and laptops , and are also widely used in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools, so the safety requirements for lithium-ion batteries are getting higher and higher.

However, for the current lithium-ion batteries, due to the relatively high energy of the positive electrode materials used, in terms of safety tests, serious safety hazards are likely to occur under the working conditions of overshoot, short circuit, and high temperature. At the same time, because the battery is often used under high temperature and high humidity conditions, the casing is prone to corrosion, which seriously affects the service life of the battery and reduces the user's experience in using the product.

In view of this, there is an urgent need to develop a technology that can effectively protect the lithium-ion battery, and at the same time, it is not easy to corrode the casing, ensure the service life of the battery, and improve the user's experience of using the battery product.

Utility model content

In view of this, the purpose of this utility model is to provide a battery with a large current protection function, which can effectively protect the lithium-ion battery, and at the same time, it is not easy to corrode the shell, ensure the service life of the battery, and improve the user's confidence in the battery. The use experience of battery products is conducive to improving the market application prospects of battery manufacturers' products, and has great practical significance in production.

For this reason, the utility model provides a battery with a large current protection function, including a battery cell, and the left and right ends of the top of the battery cell respectively have a positive connecting piece and a negative connecting piece, and the positive connecting piece and the negative The connecting pieces are connected to each other through a battery cover plate with a large current protection structure;

The positive connecting piece and the battery cover are electrically connected to each other, and a fusing part is arranged between the two, and the fusing part is used to disconnect the positive connecting piece from the battery cover when the current passing through the battery is too large. Conductive connection between;

The negative electrode connecting piece is not electrically connected to the battery cover, and a pressure member is arranged between the two, and the pressure member is used to connect the negative electrode connecting piece to the battery cell when the internal pressure of the battery cell rises to a preset value. The battery cover is electrically connected.

Wherein, the outer wall of the fuse part has a wrapping and fixing block, and the wrapping and fixing block is formed by injection molding of polyphenylene sulfide (PPS).

Wherein, the preset value of the internal pressure of the battery cells ranges from 0.35Mpa to 0.65Mpa.

Wherein, the battery cover plate includes a bottom plate of the battery cover plate, and the upper surfaces of the left and right ends of the bottom plate of the battery cover plate respectively have a first groove and a second groove;

The first groove has a rectangular, hollow positive electrode rubber pad, and a positive electrode pressure plate is placed inside the positive electrode rubber pad. The positive electrode pressure plate is in contact with the first groove, and the bottom surface of the left end of the bottom plate of the battery cover A positive electrode sealing gasket is connected, and the left end of the bottom plate of the battery cover, the positive electrode rubber pad, the positive electrode pressing plate and the positive electrode sealing gasket are riveted together by a positive electrode rivet.

Wherein, the positive electrode rivet includes a positive electrode nail body and a positive electrode nail core, the positive electrode nail core is vertically arranged on the top of the left end of the positive electrode nail body, the positive electrode nail body is located directly below the positive electrode gasket, and the positive electrode The nail mandrel passes through the positive electrode sealing gasket, the left end of the bottom plate of the battery cover plate and the positive electrode pressure plate sequentially from bottom to top, and is riveted together with the top surface of the positive electrode nail mandrel.

Wherein, the lateral middle position of the positive rivet is provided with a longitudinally distributed fuse part, the outer wall of the fuse part has a wrapping fixing block, the fuse part is located between the left end and the right end of the positive pole rivet and The left end and the right end of the positive electrode nail body are spaced apart.

Wherein, the pressure component is a pressure film, the pressure film is provided on the top surface of the second groove, and a negative electrode insulating rubber pad is placed above the pressure film, and a negative electrode pressure plate is placed inside the negative electrode insulating rubber pad. The left end of the insulating rubber pad has a through hole, and the space where the left end of the negative plate is located and the space where the pressure film is located are connected through the through hole;

The bottom right end of the battery cover bottom is fixedly connected with a negative electrode gasket, and the right end of the battery cover bottom, the negative electrode insulating rubber pad, the negative electrode pressure plate and the negative electrode gasket are riveted together by a negative electrode rivet.

It can be seen from the technical solution provided by the utility model above that, compared with the prior art, the utility model provides a battery with a high-current protection function, and the battery cover on it has a high-current protection function, which can effectively protect lithium ions The battery is protected safely, and at the same time, the shell is not easy to corrode, ensuring the service life of the battery, thereby improving the user's experience of using the battery product, and helping to improve the market application prospect of the battery manufacturer's product, which has great practical significance in production.

Description of drawings

Figure 1 is a schematic diagram of the overall structure of a battery cover in a battery with a large current protection function provided by the present invention;

Fig. 2 is a three-dimensional exploded structure diagram of a battery cover plate in a battery with a large current protection function provided by the utility model;

Fig. 3 is a schematic diagram of the position state change of the pressure film in the battery cover of a battery with a large current protection function provided by the utility model when there is a problem with the battery cell;

Fig. 4 is a schematic diagram of the current flow in a battery with a large current protection function provided by the utility model when there is a problem with the battery cell;

In the figure: 1 is the battery cover, 11 is the bottom plate of the battery cover, 2 is the positive plate, 3 is the negative plate, 4 is the positive rivet, 5 is the negative rivet, 6 is the positive pad, 7 is the negative insulating pad, 8 is the positive electrode sealing gasket, and 9 is the negative electrode sealing gasket;

10 is the bottom plate of the battery cover, 11 is the first groove, 12 is the second groove, 20 is the positive connecting piece, 30 is the negative connecting piece, 40 is the pressure film, 41 is the positive nail body, 42 is the positive nail core, 43 is a fuse part, 44 is a package fixing block, 51 is a negative pole nail body, 52 is a negative pole nail core, 70 is a through hole, and 100 is a battery cell.

detailed description

In order to enable those skilled in the art to better understand the solution of the utility model, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments.

Referring to Fig. 1 to Fig. 4, the utility model provides a battery with a large current protection function, and its structure is mainly suitable for batteries with an aluminum shell as the basic mechanism, especially for high-energy and high-efficiency power batteries. A battery with a large current protection function provided by the utility model includes a battery cell 100, and the left and right ends of the top of the battery cell 100 respectively have a positive connecting piece 20 and a negative connecting piece 30, and the positive connecting piece 20 and the top of the negative electrode connecting piece 30 are welded with a battery cover plate 1 with a large current protection structure.

In the present utility model, it should be noted that a large current generally refers to passing a current of not less than 2000A (ampere).

In the present utility model, it should be noted that, in order to realize the large current protection function, in specific implementation, the positive electrode connection piece 20 and the battery cover plate 1 are electrically connected to each other (default state when the battery leaves the factory) and both There is a fuse part between them, and the fuse part is used to disconnect the conductive connection between the positive electrode connecting piece 20 and the battery cover plate 1 when the battery is short-circuited, overcharged, etc., resulting in an excessive current. ;

The negative connecting piece 30 is not electrically connected to the battery cover plate 1 (by default, the state when the battery leaves the factory), and a pressure member is arranged between the two, and the pressure member is used to raise the internal pressure of the battery cell to a predetermined level. When setting the value, the negative electrode connection piece 30 is electrically connected to the battery cover plate 1 .

Therefore, if the internal pressure of the battery cell rises to a preset value due to abnormal conditions such as internal short circuit, diaphragm puncture, overshoot, extrusion, etc., the negative electrode connecting piece can be connected to the negative electrode through the pressure member. At this time, if the positive connecting piece and the battery cover are electrically connected to each other (the default connection state at the time of delivery), it will cause the positive connecting piece 20 and the negative connecting piece 30 to be connected to each other. If there is a short circuit (so that the current exceeds 2000A) due to the conductive connection, that is, an overcurrent situation occurs, at this time the fuse component will work to disconnect the conductive connection between the positive electrode connecting piece and the battery cover, so that the current will not Then the current transmission is carried out, so as to form an effective safety protection for the problem battery.

In terms of specific implementation, referring to Fig. 1 and Fig. 2, the battery cover 1 includes a battery cover bottom plate 10, and the upper surfaces of the left and right ends of the battery cover bottom plate 10 respectively have a first groove 11 and a second groove 12;

The first groove 11 has a rectangular, hollow positive electrode rubber pad 6, and the positive electrode pressure plate 2 is placed inside the positive electrode rubber pad 6, and the positive electrode pressure plate 2 is in contact with the first groove 11, and the battery The bottom surface of the left end of the cover bottom plate 10 is fixedly connected with the positive electrode gasket 8 , and the left end of the battery cover bottom plate 10 , the positive electrode rubber pad 6 , the positive electrode pressure plate 2 and the positive electrode gasket 8 are riveted together by a positive electrode rivet 4 .

Referring to FIG. 2 , in specific implementation, the positive rivet 4 includes a positive nail body 41 and a positive nail core 42, the positive nail core 42 is vertically arranged on the top left end of the positive nail body 41, and the positive nail body 41 is located at Directly below the positive electrode sealing gasket 8, the positive electrode nail core 42 runs through the positive electrode sealing gasket 8, the left end of the battery cover bottom plate 10 and the positive electrode pressure plate 2 from bottom to top and connects with the positive electrode nail core 42 The top faces are riveted together.

In the present utility model, a longitudinally distributed fusing part 43 is provided at the lateral middle position of the positive rivet 4. In actual implementation, the fusing part 43 is preferably a fuse, which is equipped with a fuse that can withstand a large current (for example, above 2000A). ) can fuse characteristics.

Specifically, the outer wall of the fusing part 43 has a wrapping fixing block 44, which is used to fix and position the fusing part, so as to ensure the mechanical lightness of the fusing part 43 and prevent the fusing part from 43 Problems with fracture during riveting and vibration testing.

In terms of specific implementation, the wrapping fixing block 44 is formed by injection molding of PPS (polyphenylene sulfide), has high strength, and realizes fixing and positioning of the fuse part 43 .

Specifically, the fusing component 43 is located between the left end and the right end of the positive rivet 41 of the positive rivet 4 and separates the left end and the right end of the positive rivet 41 as a space between the left end and the right end of the positive rivet 41. A link for the transmission of electricity.

It should be noted that, under normal working conditions, the positive electrode connection piece 20 of the battery cell 100 is electrically connected to the positive electrode pressing plate and the battery cover bottom plate 10 through the positive electrode rivet 4 . When the fuse part 43 encounters a large current passing through, it will automatically fuse, so that the left end and the right end of the positive rivet 41 in the positive rivet 4 are disconnected, so that the right end of the positive rivet 41 is connected. The positive electrode connecting piece 20 will no longer be electrically connected to the positive electrode pressing plate connected to the left end of the positive electrode nail body 41 and the battery cover bottom plate 10 .

Referring to FIG. 4 together, in specific implementation, the positive nail core 42 on the top left end of the positive rivet 4 is laser welded together with the positive plate 2 , and the bottom right end of the positive rivet 4 is welded to the top of the battery cell 100 . The positive connecting piece 20 is ultrasonically welded together.

Referring to FIG. 2 and FIG. 3 , in the present invention, in terms of specific implementation, the pressure member is preferably a pressure film 40 , and the top surface of the second groove 12 has the pressure film 40 .

In terms of specific implementation, the preset turning-up pressure of the pressure membrane is controlled at about 0.5±0.15MPa, that is, in the range of 0.35Mpa-0.65Mpa, and the pressure membrane will be turned up only when the internal pressure of the battery cell rises to this preset value. The material of the pressure membrane is preferably A3003 (Japanese manganese alloy aluminum).

In terms of specific implementation, there is a non-hollow negative electrode insulating rubber pad 7 above the pressure membrane 40, and the negative electrode pressure plate 3 is placed inside the negative electrode insulating rubber pad 7. The left end of the negative electrode insulating rubber pad 7 has a through hole 70. The space where the left end of the negative plate 3 is located and the space where the pressure film 40 is located communicate through the through hole 70 (because there is no rubber pad for blocking between the left end of the negative plate 3 and the pressure film 40);

It should be noted that the negative electrode pressing plate 3 is not in contact with the second groove 12, and the negative electrode insulating rubber pad 7 is located between the second groove 12 of the bottom plate of the battery cover 10 and the negative electrode pressing plate 3 The gap is used to separate the second groove 12 of the battery cover bottom plate 10 from the negative electrode pressing plate 3, so as to achieve the insulation effect.

In terms of specific implementation, the bottom surface of the right end of the battery cover bottom plate 10 is fixedly connected (specifically connected by injection molding) with a negative electrode sealing gasket 9, the right end of the battery cover bottom plate 10, the negative electrode insulating rubber pad 7, the negative electrode pressure plate 3 and The negative electrode sealing gasket 9 is riveted together by a negative electrode rivet 5 .

Referring to FIG. 2 , in specific implementation, the negative electrode rivet 5 includes a negative electrode nail body 51 and a negative electrode nail core 52, the negative electrode nail core 52 is vertically arranged on the top right end of the negative electrode nail body 51, and the negative electrode nail body 51 is located at Directly below the negative electrode sealing gasket 9, the negative electrode nail core 52 runs through the negative electrode sealing gasket 9, the right end of the battery cover bottom plate 10 and the negative electrode pressure plate 3 from bottom to top, and connects with the negative electrode nail core 52 The top surfaces are riveted together.

In terms of specific implementation, the pressure membrane 40 is made of aluminum, like the bottom plate 10 of the battery cover. The pressure membrane 40 will naturally turn up when the pressure resistance inside the battery cell 100 reaches a preset value (the value depends on the shape and thickness of the pressure membrane).

Referring to FIG. 4 together, in specific implementation, the negative nail core 52 at the top of the right end of the negative rivet 5 is laser welded together with the negative plate 3 , and the bottom of the negative rivet 5 is welded to the top of the battery cell 100 . The negative connecting pieces 30 are ultrasonically welded together.

For the present utility model, batteries made of relatively high-energy materials can be satisfied. When the batteries work normally, the internal temperature and air pressure are kept in a relatively stable state, and there will be no safety problems. However, when there is a problem with the assembly PACK of the battery or the battery cell, there may be a risk of short circuit and overshoot. Needle punctures on batteries can even occur when the body of the car in which the battery is installed is hit. When these occur, the positive electrode connecting piece 20 and the negative electrode connecting piece 30 of the battery cell 100 will have problems such as lithium deposition, diaphragm piercing, and positive and negative electrode short circuit. At this time, referring to FIG. 3 , the internal temperature and pressure of the battery cell rise sharply, and the pressure membrane 40 of the battery cell is in a concave position A in a normal state, and is pushed up to a convex position B under high pressure. Thereby the protruding portion of the pressure film 40 passes through the through hole 70 and is connected with the negative electrode pressure plate 3, while the negative electrode pressure plate 3, the negative electrode nail core 52, and the negative electrode connecting piece 30 are connected by default, and the pressure film 40 is in the battery cover at the same time. On the second groove 12 at the right end of the bottom plate 10, and the two ends of the pressure film 40 are fixedly connected with the bottom plate 10 of the battery cover, so that the negative electrode connecting piece 30 is conductively connected with the bottom plate 10 of the battery cover.

It should be noted that, because the negative plate 3 is on the pressure membrane 40, and the pressure membrane 30 is located on the bottom plate 10 of the battery cover, when the pressure membrane 40 is turned up under high pressure, it will directly touch the pressure membrane 40 after passing through the through hole 70. to the negative electrode pressing plate 3, so that the negative electrode connecting piece 30 connected to the negative electrode pressing plate 3 realizes a phase conduction connection between the battery cover plate bottom plate 10 connected to the two ends of the pressure film 40 (that is, the negative electrode connecting piece 30 and the battery cover plate bottom plate Conductive connection between 10). Since the positive plate 2 is connected to the battery cover bottom plate 10 itself, the positive and negative poles of the battery pole group are short-circuited so that the current exceeds 2000A, thereby blowing the fuse part.

Because the positive electrode connecting piece 20 is connected to the easily conductive battery cover bottom plate 1 under normal conditions (the battery cover bottom plate 10 is not connected with the negative electrode connecting piece 30 under normal conditions, because there is an insulating negative electrode insulating rubber pad 7, The bottom plate 10 of the battery cover plate is not in contact with the negative electrode pressure plate 3, and then the negative electrode rivet 5 and the negative electrode connecting piece 30 which are not connected to the negative electrode pressure plate 3 are electrically conductive to each other), then, at this time, the positive electrode connecting piece 20 and the negative electrode will be connected The sheets 30 are electrically connected to each other, and in the event of a short circuit, the direction of the current is as shown by the arrow in Figure 4, from the positive connecting sheet 20 of the battery cell to the bottom plate 10 of the battery cover, and then to the negative plate 3 and the negative electrode. Connecting piece 30. At this time, the fuse strip located in the positive rivet 4 will automatically fuse, so that the left end and the right end of the positive rivet 4 are disconnected, so that the positive connecting piece 20 connected to the right end of the positive rivet 4 will not Then, the positive electrode pressing plate connected to the left end of the positive electrode rivet 4 and the battery cover bottom plate 10 are conductively connected, so that the short circuit can be stopped, and at the same time, the battery stops functioning, and the danger of the battery is greatly reduced. If the consistency of the batteries is done well, then the battery packs connected in series will be completely disconnected, and the entire battery pack will not be detonated due to faulty batteries, avoiding major safety accidents.

Therefore, for a battery with a large current protection function provided by the utility model, the battery can be separated from the external environment under extremely severe external environment conditions, and the battery can be protected after the pole group is not stabilized. Charging or discharging, thereby minimizing the damage to the surrounding environment of the problem cell and minimizing the possibility of cell explosion. And because the positive electrode is connected to the cover plate, the voltage of the battery case will be raised, and corrosion will basically not occur.

In summary, compared with the prior art, the utility model provides a battery with a large current protection function, the battery cover on it has a high current protection function, which can effectively protect the lithium ion battery safely, and at the same time It is not easy to corrode the shell, ensure the service life of the battery, and then improve the user's experience of using the battery product, which is conducive to improving the market application prospect of the battery manufacturer's product, and has great practical significance in production.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (7)

1. a kind of battery with high current defencive function, it is characterised in that including battery battery core (100), the battery battery core (100) top left and right two ends have positive strap (20) and negative straps (30), the positive strap (20) respectively It is connected by a battery cover board (1) with high current protection structure each other with negative straps (30)；

The positive strap (20) is mutually conductively connected with the battery cover board (1) and is provided with fusing part between the two (43), the fusing part (43) for battery by electric current it is excessive when, disconnect the positive strap (20) and the battery Being conductively connected between cover plate (1)；

The negative straps (30) are not conductively connected with the battery cover board (1) and are provided with press member, institute between the two Press member is stated for when battery battery core (100) internal pressure rises to preset value, by the negative straps (30) and institute Battery cover board (1) is stated mutually to be conductively connected.

2. battery as claimed in claim 1, it is characterised in that the outer wall of the fusing part (43) has and wraps Block (44), the block (44) that wraps takes polyphenylene thioether PPS to be molded to be formed.

3. battery as claimed in claim 1, it is characterised in that the preset value of battery battery core (100) internal pressure takes Value scope is 0.35Mpa~0.65Mpa.

4. battery as claimed in claim 2, it is characterised in that the battery cover board (1) includes battery cover board base plate (10), institute State battery cover board base plate (10) left and right two ends upper surface has the first groove (11) and the second groove (12) respectively；

There is rectangle, hollow positive pole rubber cushion (6), positive pole rubber cushion (6) the inside is placed with just on first groove (11) Extreme pressure plate (2), the positive pole pressing plate (2) is in contact with first groove (11), the left end of the battery cover board base plate (10) Bottom surface is connected with positive pole sealing gasket (8), the left end of the battery cover board base plate (10), positive pole rubber cushion (6), positive pole pressing plate (2) and Positive pole sealing gasket (8) is riveted together by a positive pole rivet (4).

5. battery as claimed in claim 4, it is characterised in that the positive pole rivet (4) includes positive pole rivet nut (41) and positive pole Blind rivet (42), the positive pole blind rivet (42) is vertically installed in the left end top of the positive pole rivet nut (41), the positive pole rivet nut (41) positioned at the underface of the positive pole sealing gasket (8), it is close that the positive pole blind rivet (42) sequentially passes through the positive pole from the bottom up Exist with positive pole blind rivet (42) the top surface riveted after packing (8), the left end of the battery cover board base plate (10) and positive pole pressing plate (2) Together.

6. battery as claimed in claim 5, it is characterised in that the lateral mid-point of the positive pole rivet (4) is provided with The fusing part (43) of bar genesis analysis, the outer wall of the fusing part (43) has one and wraps block (44), institute State between left end and right-hand member of the fusing part (43) in the positive pole rivet nut (41) and by the left end of the positive pole rivet nut (41) It is spaced apart with right-hand member.

7. battery as claimed in claim 6, it is characterised in that the press member is pressure membrane (40), second groove (12) top surface has the pressure membrane (40), and pressure membrane (40) top has negative insulation rubber cushion (7), the negative insulation Rubber cushion (7) the inside is placed with negative pole pressing plate (3), and the left end of the negative insulation rubber cushion (7) has a through hole (70), described negative Space is connected with space where the pressure membrane (40) by the through hole (70) where extreme pressure plate (3) left end；

The right-hand member bottom surface of the battery cover board base plate (10) is fixedly connected with negative pole sealing gasket (9), the battery cover board base plate (10) right-hand member, negative insulation rubber cushion (7), negative pole pressing plate (3) and negative pole sealing gasket (9) are by negative pole rivet (5) riveted Together.