Battery

Abstract

The utility model discloses a battery, which comprises a shell, a first electrode, a second electrode and a third electrode, and is characterized in that the shell is provided with a first through hole and a conductive part; the anti-explosion valve is arranged at the first through hole; the battery cell is arranged in the shell, and the battery cell is connected with a first pole and a second pole; the first conductive piece is connected with the first pole, and a part of the first conductive piece is movably contacted with or separated from the conductive part; and the second conductive piece is connected with the second pole, and the second conductive piece is connected with the conductive part. Through the application of the battery structure, the battery structure which can be short-circuited after the valve is opened is provided, and when the risk of thermal runaway is faced, the battery core in the battery is short-circuited by driving the first conductive piece to move, so that short circuit is formed among the battery core, the pole, the conductive part and the second conductive piece, and the electric energy in the battery core is released; development of an out-of-control vicious circle is restrained from the source, the temperature of the battery is reduced, and the risk of fire and even explosion is reduced, so that the safety of the battery is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the battery design technical field especially relates to a kind of batteries. BACKGROUND

[0002] The rapid development of new energy contributes greatly to energy saving and emission reduction, carbon peak and carbon neutrality. Among them, secondary batteries are a key link. In the energy storage market, secondary batteries can be used as the core component of energy storage in wind-solar-storage integrated projects. In the electric vehicle market, secondary batteries, as core components, determine key performance such as range, temperature adaptability, and power limit. In the 3C electronic market, secondary batteries are also widely used due to their portability. Unlike primary batteries, secondary batteries can be repeatedly charged and discharged. However, common secondary batteries such as lithium-ion batteries and sodium-ion batteries may experience internal short circuits due to mechanical abuse, thermal abuse, and electrical abuse, leading to thermal runaway risks such as smoking, fire, and even explosion.

[0003] In the prior art, when facing the above thermal runaway risk, a relief valve is generally provided on the shell of the battery. When the pressure inside the battery reaches a certain level, the relief valve will open before the shell cracks, releasing pressure, preventing the entire battery from exploding, and reducing the intensity of thermal runaway. However, using lithium-ion batteries as an example, experiments have shown that after the relief valve opens, the thermal runaway of the battery continues to worsen, and continuous emission of flammable smoke occurs. In this process, the smoke may burn, and even some may explode. This phenomenon indicates that even after the relief valve opens, there is still a lot of energy inside the battery. The main reason is that the residual electrochemical energy inside the battery after the valve opens will be converted into heat energy at the internal short circuit, and the heat energy will trigger the decomposition of the battery materials (such as the positive electrode, negative electrode, and electrolyte). These decomposition reactions will further increase the temperature at the internal short circuit, forming a vicious cycle. SUMMARY

[0004] Therefore, to solve the above problems, the purpose of the utility model is to provide a battery, comprising:

[0005] A first through hole is formed in the shell, and the shell has a conductive portion;

[0006] A relief valve is provided at the first through hole and can be opened;

[0007] An electric core is provided in the shell, and the electric core is connected to a first pole and a second pole;

[0008] A first conductive member is connected with the first pole, and a part of the first conductive member is movably contacted with or separated from the conductive part;

[0009] A second conductive member is connected with the second pole, and the second conductive member is connected with the conductive part.

[0010] In another preferred embodiment, an insulating member is arranged between the first conductive member and the conductive part.

[0011] In another preferred embodiment, the insulating member is connected with the explosion-proof valve, and the insulating member is separated from the first conductive member when the explosion-proof valve is opened.

[0012] In another preferred embodiment, the insulating member is made of a fusible material.

[0013] In another preferred embodiment, the first conductive member is a spring structure, one end of the spring structure is connected with the first pole, and the other end of the spring structure has a tendency to be close to the conductive part.

[0014] In another preferred embodiment, the shell comprises a shell body and a shell cover, the shell cover is arranged on the upper part of the shell body, the conductive part is formed on the shell cover, and the first through hole is arranged on the shell cover.

[0015] In another preferred embodiment, a first electrode terminal and a second electrode terminal are further included, the first electrode terminal is connected with the first pole, the second electrode terminal is connected with the second pole, and the second conductive member is connected with the second electrode terminal.

[0016] In another preferred embodiment, a first insulating seat and a second insulating seat are further included, the first insulating seat and the second insulating seat are arranged on the shell, and the first electrode terminal and the second electrode terminal are respectively arranged on the first insulating seat and the second insulating seat.

[0017] In another preferred embodiment, the second conductive member is arranged on the second insulating seat.

[0018] In another preferred embodiment, a stop frame is further included, two limiting channels and a avoiding hole are arranged on the stop frame, the first pole and the second pole are respectively arranged through the two limiting channels, and the first conductive member is arranged through the avoiding hole.

[0019] The utility model discloses the above-mentioned technical scheme is adopted, and compared with prior art has the positive effect that:

[0020] The battery structure can short circuit after valve opening, can short circuit the battery internal electric core by driving the movement of the first conductive part when facing the risk of thermal runaway, form short connection between the electric core, the pole, the conductive part and the second conductive part, release the electric energy in the electric core, suppress the development of the runaway vicious circle from the source, reduce the temperature of the battery, reduce the risk of fire and even explosion, and greatly improve the safety of the battery. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a first explosion schematic view of a battery of the utility model;

[0022] Figure 2 It is a mounting schematic view of a battery of the utility model;

[0023] Figure 3 It is a cross-sectional schematic view of a battery of the utility model;

[0024] Figure 4 It is a second explosion schematic view of a battery of the utility model;

[0025] Figure 5 It is a third explosion schematic view of a battery of the utility model.

[0026] IN THE DRAWINGS:

[0027] 1, shell; 2, first through hole; 3, explosion-proof valve; 4, electric core; 5, first pole; 6, second pole; 7, first conductive part; 8, second conductive part; 9, shell; 10, shell cover; 11, first electrode terminal; 12, second electrode terminal; 13, first insulating seat; 14, second insulating seat; 15, stop frame; 16, limiting channel; 17, avoiding hole; 18, second through hole; 19, liquid injection plug; 20, insulating part. DETAILED DESCRIPTION

[0028] The technical solutions of the utility model will be described clearly and completely in combination with the drawings, obviously, the described embodiments are a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0029] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms such as ''up'', ''down'', ''left'', ''right'', ''inner'', ''outer'', ''front'', ''back'', ''horizontal direction'' and ''vertical direction'' is the orientation or position relation shown based on the drawing, and is only for the convenience of describing the utility model, and does not indicate or imply that the device or element indicated must have a particular orientation, so it cannot be understood as a limitation on the utility model.

[0030] It needs to be specially pointed out that ''horizontal'' and ''vertical'' in the utility model are all used for explaining approximate position relation, and are not strict ''horizontal plane'' or ''vertical plane''.

[0031] As shown in Figures 1 to 3 The utility model discloses a battery, including: the shell 1 is set up with the first through -hole 2 on the shell 1, and the shell 1 has a conductive part, the explosion -proof valve 3 is openable and is arranged at the first through -hole 2, the electric core 4 is arranged in the shell 1, and the electric core 4 is connected with the first pole 5 and the second pole 6, the first conductive part 7 is connected with the first pole 5, and the part of the first conductive part 7 is movably contacted or separated with the conductive part, the second conductive part 8 is connected with the second pole 6, and the second conductive part 8 is connected with the conductive part. Further, the electric connection between the conductive part and the second pole 6 is realized through the second conductive part 8, the first conductive part 7 keeps the separated state with the conductive part under the normal use state of the battery, and under the heat runaway condition, the first conductive part 7 can be moved to contact the conductive part to realize the electric connection, which makes the electric core 4 be short-circuited.

[0032] Further, as a preferred embodiment, the above-mentioned heat runaway condition is the condition that the internal pressure of the secondary battery is too large due to the gas generated by mechanical abuse, electrical abuse or thermal abuse, under the heat runaway condition, the explosion -proof valve 3 can be opened, so that the gas formed in the battery interior can be discharged to the outside, thereby preventing explosion.

[0033] Further, as a preferred embodiment, the shell 1 includes: a shell body 9 and a shell cover 10, the shell cover 10 is arranged at the upper portion of the shell body 9, the conductive part is formed on the shell cover 10, and the first through -hole 2 is arranged on the shell cover 10. Further, the first through -hole 2 is arranged at the middle portion of the shell cover 10, the space for accommodating the electric core 4 is formed in the shell body 9, the conductive part is preferably a part of the shell cover 10, and the shell cover 10 is preferably made of conductive material.

[0034] Further, as a preferred embodiment, the conductive part can also be an independent conductive part arranged at the position close to the shell cover 10, and the conductive part has at least the electric connection part with the second conductive part 8 and the electric connection part with the first conductive part 7.

[0035] Further, as a preferred embodiment, the shell 9 is in the form of a rectangular box structure.

[0036] Further, as a preferred embodiment, the shell 9 is made of metal material, and the shell 9 is preferably made of metal material such as aluminum, aluminum alloy or nickel-plated steel.

[0037] Further, as a preferred embodiment, the shell cover 10 is preferably made of the same or similar material as the shell 9, and the shell cover 10 is preferably made of metal material such as aluminum, steel or alloy.

[0038] Further, as a preferred embodiment, the shell cover 10 is in the form of a thin plate structure, and the upper end of the shell 9 has an opening for mounting the shell cover 10.

[0039] Further, as a preferred embodiment, it further comprises a first electrode terminal 11 and a second electrode terminal 12, the first electrode terminal 11 is connected with the first pole 5, the second electrode terminal 12 is connected with the second pole 6, and the second conductive member 8 is connected with the second electrode terminal 12.

[0040] Further, as a preferred embodiment, the first electrode terminal 11 and the second electrode terminal 12 are both made of metal material, and are preferably made of metal material such as aluminum, copper, steel or alloy.

[0041] Further, as a preferred embodiment, the second conductive member 8 can be directly connected with the second pole 6, or indirectly connected with the second pole 6 through the second electrode terminal 12.

[0042] Further, as a preferred embodiment, the second conductive member 8 preferably has a certain resistance value, and the resistance value and the size thereof can be selected according to the capacity and the limit current of the battery.

[0043] Further, as a preferred embodiment, the second conductive member 8 can be made of metal conductor, resistor, NTC thermistor, PTC thermistor, graphite or other conductive material.

[0044] Further, as a preferred embodiment, it further comprises a first insulating seat 13 and a second insulating seat 14, the first insulating seat 13 and the second insulating seat 14 are both arranged on the shell 1, and the first electrode terminal 11 and the second electrode terminal 12 are respectively mounted on the first insulating seat 13 and the second insulating seat 14. Further, the first electrode terminal 11 is insulated from the shell cover 10 through the first insulating seat 13, and the second electrode terminal 12 is insulated from the shell cover 10 through the second insulating seat 14.

[0045] Further, as a preferred embodiment, the first insulating seat 13 and the second insulating seat 14 are both made of insulating material, and the first insulating seat 13 and the second insulating seat 14 are preferably made of one or more of polyphenylene sulfide (PPS), perfluoroalkoxy resin (PEA) or polypropylene (PP).

[0046] Further, as a preferred embodiment, the second conductive member 8 is installed on the second insulating seat 14. Further, the second insulating seat 14 is provided with a first hole for installing the second electrode terminal 12 and a second hole for installing the second conductive member 8.

[0047] Further, as a preferred embodiment, the second conductive member 8 is installed on the second insulating seat 14. Further, the second insulating seat 14 is provided with a first hole for installing the second electrode terminal 12 and a second hole for installing the second conductive member 8.

[0048] Further, as a preferred embodiment, the shell cover 10 is provided with a second through hole 18, and the second through hole 18 is provided with a liquid injection stopper 19. Further, the second through hole 18 is used for injecting electrolyte into the battery, and the shell cover 10 is sealed by the liquid injection stopper 19 after the injection.

[0049] Further, as a preferred embodiment, the liquid injection stopper 19 is preferably made of a material similar to the shell 9, and the material is preferably aluminum, aluminum alloy or nickel-plated steel.

[0050] Further, as a preferred embodiment, the shell cover 10 is provided with two third through holes for the first pole 5 and the second pole 6 to pass through. Further, the third through holes are used to guide the installation of the corresponding poles at the shell cover 10.

[0051] Further, as a preferred embodiment, the battery cell 4 is preferably in a roll core structure or a stack core structure.

[0052] Further, as a preferred embodiment, the battery cell 4 preferably includes at least one first pole piece, at least one second pole piece and at least one diaphragm, the diaphragm is arranged between the first pole piece and the second pole piece, and the diaphragm is an insulator. Further, the first pole piece is a positive pole piece, and the second pole piece is a negative pole piece.

[0053] Further, as a preferred embodiment, the first pole 5 and the second pole 6 are made of metal material, and are preferably aluminum, copper, steel or alloy.

[0054] The above description is only a preferred embodiment of the present application, and does not limit the implementation and protection scope of the present application.

[0055] The utility model discloses further have the following implementation on the basis of above:

[0056] Among them, the movement of the part of the first conductive part 7 can be realized by the following embodiments:

[0057] As a first embodiment of the movement of the first conductive part 7, specifically:

[0058] In the further embodiment of the utility model, the first conductive part 7 is made of deformable conductive material, the part of the first conductive part 7 is arranged close to the first through hole 2, and when the explosion-proof valve 3 is opened, the airflow at the first through hole 2 will flow outward quickly, and the airflow makes the first conductive part 7 deformed under stress, and the part of the first conductive part 7 contacts the conductive part.

[0059] In the further embodiment of the utility model, the first conductive part 7 has a surplus in structural design, that is, under the condition that the two ends of the first conductive part 7 are relatively stationary, other parts of the first conductive part 7 can still move, preferably, the first conductive part 7 is arranged in an arc structure or a bent structure.

[0060] As a second embodiment of the movement of the first conductive part 7, specifically:

[0061] In the further embodiment of the utility model, further include: insulating part 20, insulating part 20 set up between the first conductive part 7 and the conductive part. Further, the insulating part 20 has a low melting point, so that when there is high-temperature flue gas inside the battery, the insulating part 20 can melt itself, and when the insulating part 20 melts, the isolation between the first conductive part 7 and the conductive part is eliminated, and the first conductive part 7 directly contacts the conductive part.

[0062] In the further embodiment of the utility model, the insulating part 20 is made of a fusible material. Preferably, plastics that are not resistant to high temperature can be selected, such as PC (polycarbonate), PET (polyethylene terephthalate), PS (polystyrene), PVC (polyvinyl chloride), ABS (acrylonitrile-butadiene-styrene) and SAN (styrene-acrylonitrile).

[0063] In the further embodiment of the utility model, the insulating part 20 is preferably a gasket structure.

[0064] In the further embodiment of the utility model, the melting point of the insulating part 20 is in the range of 80 DEG C to 200 DEG C.

[0065] In the further embodiment of the utility model, the first conductive part 7 is a spring structure, one end of the spring structure is connected with the first pole 5, and the other end of the spring structure has a tendency close to the conductive part.

[0066] In further embodiments of the utility model, the size of the elastic sheet structure can be designed in different size values according to the capacity and short-circuit current of the battery cell 4.

[0067] In further embodiments of the utility model, the first conductive member 7 has a pre-stress towards the shell cover 10, which causes the part of the first conductive member 7 to move spontaneously towards the conductive part when there is no isolation between the first conductive member 7 and the conductive part, until it is in contact with the conductive part. In addition, the pre-stress also causes the insulating member 20 to be tightly abutted against the inner wall of the shell cover 10, so that the insulating member 20 will not accidentally fall off in the normal use state of the battery, preventing accidental short circuit.

[0068] In further embodiments of the utility model, the direction of the pre-stress is perpendicular to the explosion-proof valve 3, so that the first conductive member 7 is pressed on the conductive part by the high-speed sprayed smoke gas even when the pre-stress is very small.

[0069] Further, as a preferred embodiment, the end of the elastic sheet structure is provided with at least one mounting hole, which is sleeved on the first pole 5.

[0070] As a third embodiment of the movement of the first conductive member 7, specifically:

[0071] In further embodiments of the utility model, the difference from the above-mentioned second embodiment is that the direction of the pre-stress of the first conductive member 7 is approximately parallel to the explosion-proof valve 3.

[0072] As shown in Figure 4 In further embodiments of the utility model, the end of the first conductive member 7 has an upwardly extending bending part, and the insulating member 20 is arranged in contact with the bending part.

[0073] In further embodiments of the utility model, the bending part extends into the inside of the first through hole 2, and the insulating member 20 is clamped between the bending part and the inner wall of the first through hole 2; or the lower surface part of the shell cover 10 at the first through hole 2 extends downwardly to form a surrounding wall, and the insulating member 20 is clamped between the bending part and the outer wall of the surrounding wall.

[0074] As a fourth embodiment of the movement of the first conductive member 7, specifically:

[0075] In further embodiments of the utility model, the difference from the above-mentioned second embodiment is that the insulating member 20 can be made of a non-fusible material, and the insulating member 20 is connected with the explosion-proof valve 3; when the explosion-proof valve 3 is opened, the insulating member 20 is separated from the first conductive member 7. Further, when the high-pressure smoke gas inside the battery reaches a certain pressure, the explosion-proof valve 3 is opened, but the explosion-proof valve 3 will not be completely destroyed, and will move together with the insulating member 20, so that the insulating member 20 is separated from the original position and allows the first conductive member 7 to be electrically connected with the conductive part.

[0076] The further embodiment of the utility model discloses still include: connecting piece, connecting piece is used for connecting insulating part 20 and explosion -proof valve 3.

[0077] The further embodiment of the utility model discloses, connecting piece preferably is the colloid of electrolyte corrosion resistance.

[0078] The further embodiment of the utility model discloses, insulating part 20 with first conducting part 7 between having coupling's connection, preferably the coupling can be that insulating part 20 is set in the end of first conducting part 7, and the set allows insulating part 20 to separate first conducting part 7.

[0079] The further embodiment of the utility model discloses, the shell cover 10 can be realized through as follows embodiment:

[0080] As the first embodiment of shell cover 10, specifically speaking:

[0081] The further embodiment of the utility model discloses, as Figure 1 Or The further embodiment of the utility model discloses, as Figure 4 As shown, when the battery adopts the square shell battery structure, the number of shell cover 10 is one, the shell cover 10 is directly arranged on the shell 9, the number of stop frame 15 is also one, and the first pole 5 and the second pole 6 are arranged in the same direction, and the first through hole 2 and the second through hole 18 are arranged on the shell cover 10.

[0082] As the second embodiment of shell cover 10, specifically speaking:

[0083] The further embodiment of the utility model discloses, as Figure 5 As shown, when the battery adopts the blade battery structure.

[0084] The further embodiment of the utility model discloses, and the shell cover 10 includes two cover body parts, or also can be considered that two shell covers 10 are arranged, and the two shell covers 10 are arranged at the left end and the right end of the shell 9 respectively, and the first pole 5 and the second pole 6 are arranged at the two ends of the battery cell 4 respectively.

[0085] The further embodiment of the utility model discloses, and the number of stop frame 15 is also two, and the two stop frames 15 are arranged correspondingly to the first pole 5 and the second pole 6.

[0086] The further embodiment of the utility model discloses, and the first conducting part 7 is arranged at the first pole 5 and is partially movably in contact with the left end shell cover 10, and the second conducting part 8 is arranged on the right end shell cover 10.

[0087] The further embodiment of the utility model discloses, and the first through hole 2 is arranged on the left end shell cover 10, and the second through hole 18 is arranged on the right end shell cover 10.

[0088] Among them, the above-mentioned embodiments, especially the embodiments for the movement of the first conductive member 7 and the embodiments of the shell cover 10 can be combined with each other according to actual conditions.

[0089] The above only describes the preferred embodiments of the present application, and does not limit the implementation and protection scope of the present application. For those skilled in the art, it should be realized that any equivalent replacement and obvious changes made according to the content of the present application description and drawings should be included in the protection scope of the present application.

Claims

1. A battery, characterized by, The application relates to a battery, which comprises the following parts: a shell, a first through hole is formed in the shell, and the shell is provided with a conductive part; an explosion-proof valve, which is arranged at the first through hole in an openable mode; an electric core, which is arranged in the shell and is connected with a first pole and a second pole; a first conductive part, which is connected with the first pole and is partially movably contacted with or separated from the conductive part; a second conductive part, which is connected with the second pole and is connected with the conductive part.

2. The battery of claim 1, wherein The application further comprises: an insulating part, which is arranged between the first conductive part and the conductive part.

3. The battery of claim 2, wherein, The insulating part is connected with the explosion-proof valve, and when the explosion-proof valve is opened, the insulating part is separated from the first conductive part.

4. The battery of claim 2, wherein, The insulating part is made of a fusible material.

5. The battery of claim 1, wherein, The first conductive part is in the form of a spring piece, one end of the spring piece is connected with the first pole, and the other end of the spring piece has a tendency to approach the conductive part.

6. The battery of claim 1, wherein, The shell comprises a shell body and a shell cover, the shell cover is arranged at the upper part of the shell body, the conductive part is formed on the shell cover, and the first through hole is formed on the shell cover.

7. The battery of claim 1, wherein, The application further comprises: a first electrode terminal and a second electrode terminal, the first electrode terminal is connected with the first pole, the second electrode terminal is connected with the second pole, and the second conductive part is connected with the second electrode terminal.

8. The battery of claim 7, wherein, The application further comprises: a first insulating seat and a second insulating seat, which are arranged on the shell, the first electrode terminal and the second electrode terminal are respectively arranged on the first insulating seat and the second insulating seat.

9. The battery of claim 8, wherein, The second conductive part is arranged on the second insulating seat.

10. The battery of claim 1, wherein, The application further comprises: a stop frame, which is provided with two limiting channels and a avoiding hole, the first pole and the second pole are respectively arranged through the two limiting channels, and the first conductive part is arranged through the avoiding hole.

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