Top cover of battery, battery and electric device

Abstract

The utility model relates to the technical field of batteries, and discloses a top cover of a battery, the battery and an electric device, the top cover comprises a cover plate main body, a pole, a plastic part and a metal block; the plastic part and the pole are respectively connected to the cover plate main body, the metal block is arranged on the inner side, facing a battery cell, of the cover plate main body, the metal block is in heat conduction with the pole, the melting point of the metal block is lower than that of the plastic part, and the melting point of the metal block is higher than that of a diaphragm in the battery cell. The metal block is used for melting a diaphragm in the battery cell and conducting a positive plate and a negative plate in the battery cell; the battery mainly solves the technical problems that the battery can not only meet the use requirement of large current, but also can reduce the risk of fire when external short circuit occurs.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of battery, especially a battery's top cover, battery and electric device. BACKGROUND

[0002] At present, in order to ensure safety, some batteries are usually provided with an insurance structure inside, specifically, the middle region of a switching piece (a component for connecting a pole and a tab led out by an internal cell) is usually designed to be narrow in width, when external short circuit occurs outside the battery, under the action of short-circuit supercurrent, the temperature of the insurance region will rise sharply, and the switching piece will be fused at the insurance position, thereby disconnecting the pole and the tab, and disconnecting the path between the positive and negative poles of the internal cell, thereby ensuring the safety of the cell. However, although the middle part of the switching piece is designed to be narrow in width, it can automatically disconnect at high temperature, but the narrow-width switching piece has a small overcurrent cross section, which cannot adapt to large current overcurrent.

[0003] At present, the performance requirements for batteries are getting higher and higher, especially the fast charging and overcurrent capacity, which requires the battery to have greater current carrying capacity. The switching piece with the insurance structure obviously severely limits the overcurrent capacity of the battery. The battery with the insurance structure generally increases the resistance by reducing the cross-sectional area, therefore, more and more batteries do not have the insurance structure on the switching piece in order to pursue greater overcurrent performance. More specifically, when the battery does not have the insurance structure inside, when external short circuit occurs outside the battery, supercurrent will be generated, and the pole, switching piece, tab and other components of the battery will rapidly increase in temperature due to the thermal effect of the current, and the plastic components (such as the first plastic component between the pole and the cover body or the second plastic component arranged at the bottom of the cover body) on the battery will catch fire and explode due to the difficulty in resisting high temperature, which easily leads to explosion of the battery, which does not meet the current requirements for safety performance of the battery.

[0004] Therefore, it is necessary to improve the prior art. UTILITY MODEL CONTENTS

[0005] The utility model provides a battery's top cover, battery and electric device, mainly solves the technical problem that how the battery can meet the use requirement of large current and can reduce the risk of fire when external short circuit occurs.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] A top cover of a battery, comprising a cover body, a pole, a plastic component and a metal block.

[0008] The plastic part and the pole are respectively connected to the cover body, and the metal block is arranged on the inner side of the cover body facing the battery cell. The metal block and the pole are heat-conducting. The melting point of the metal block is lower than the melting point of the plastic part, and the melting point of the metal block is higher than the melting point of the diaphragm inside the battery cell. The metal block is used to melt the diaphragm inside the battery cell and conduct the positive and negative electrodes inside the battery cell.

[0009] In one of the technical solutions, a through opening is provided on the cover body, the pole is provided at the opening, a first plastic part is connected between the pole and the hole wall of the opening, the first plastic part is used to insulate and separate the pole and the cover body, the plastic parts include the first plastic part, and the melting point of the metal block is lower than the melting point of the first plastic part.

[0010] In one of the technical solutions, the top cover of the battery also includes an adapter, which is used to connect to the tab led out of the battery cell. The adapter is also used to connect to the pole, and the metal block conducts heat to the pole by conducting heat with the adapter.

[0011] In one of the technical solutions, the plastic part includes a second plastic part, which is arranged between the bottom of the cover body and the adapter. The second plastic part is used to insulate and separate the cover body and the adapter, and the melting point of the metal block is lower than the melting point of the second plastic part.

[0012] In one of the technical solutions, the metal block is provided at the connection between the adapter and the pole or at the connection between the pole tab and the adapter.

[0013] In one of the technical solutions, the top cover of the battery also includes a third plastic part, which is insulating. The third plastic part is located between the adapter and the battery cell and is used to support the adapter. The metal block is fixed on the third plastic part and is located at a position corresponding to the pole. The plastic part includes the third plastic part. The melting point of the metal block is lower than the melting point of the third plastic part. The third plastic part is provided with a through hole at a position corresponding to the metal block. The through hole is used to allow the metal block to drip down into the battery cell after melting.

[0014] In one of the technical solutions, the metal block is accommodated in the through hole, and the gap between the metal block and the adapter is coated with a heat-conducting layer.

[0015] In one technical solution, the top cover further includes a second plastic member, the second plastic member being disposed between the bottom of the cover body and the adapter, the second plastic member being used to insulate and separate the cover body and the adapter, the plastic member including the second plastic member, and the melting point of the metal block being lower than the melting point of the second plastic member;

[0016] The second plastic part and the third plastic part are an integral structure, and the third plastic part can be folded 180° relative to the second plastic part.

[0017] In one of the technical solutions, two poles are provided on the cover plate body, and one metal block is provided below each of the poles.

[0018] The present application also provides a battery, comprising a shell, a battery cell and a top cover as described above, wherein the battery cell comprises a positive electrode sheet, a negative electrode sheet and a diaphragm arranged between the positive electrode sheet and the negative electrode sheet, the shell is provided with an open mounting groove, the battery cell is accommodated in the mounting groove, the cover body seals the notch of the mounting groove, and a pole ear is led out from the battery cell, and the pole ear is connected to the pole column.

[0019] The present application also provides an electrical device comprising the aforementioned battery.

[0020] Compared with the prior art, the battery cover provided by the present invention has at least the following beneficial effects:

[0021] The safety structure is not arranged inside the top cover of the scheme, so as to ensure that the battery has enough overcurrent area inside, thereby ensuring that the battery can meet the use requirement of large current, when external short circuit occurs outside the battery, an ultra-large current will be generated, the pole post of the battery will be rapidly heated due to the thermal effect of the current, and the temperature of the metal block and the plastic part conducting heat of the pole post will also be rapidly increased, when the temperature value of the metal block reaches the melting point of the metal block, the metal block will melt and fall down, since the melting point of the diaphragm inside the battery cell is lower than that of the metal block, the falling metal block will melt the diaphragm inside the battery cell, and since the melted metal block still has conductivity, the metal block can conduct the positive plate and the negative plate inside the battery cell after melting the diaphragm, so that internal short circuit occurs inside the battery cell, or the diaphragm melts the positive plate and the negative plate to cause internal short circuit inside the battery cell through direct contact, at this time, the purpose of current diversion is achieved, so as to reduce the current of external short circuit and reduce the rising amplitude of the temperature, thereby avoiding the phenomenon of fire of the plastic part on the battery, reducing the risk of explosion of the battery, and improving the safety of the battery in the use environment of large current. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0023] Figure 1 A structural schematic diagram of a battery is provided for the embodiments of the present application.

[0024] Figure 2 An internal structure diagram of a battery is provided for the embodiments of the present application.

[0025] Figure 3 A Figure 2 A partial enlarged view of A in FIG.

[0026] Figure 4 A structural exploded view of a battery is provided for the embodiments of the present application.

[0027] Figure 5 A structural schematic diagram of a first top cover when viewed from below is provided for the embodiments of the present application.

[0028] Figure 6 A Figure 2The schematic diagram of the structure of the battery after the third plastic part is added;

[0029] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0030] Figure 8 A schematic structural diagram of the second top cover provided in an embodiment of the present application when the third plastic part is flatly unfolded relative to the second plastic part;

[0031] Figure 9 for Figure 8 The structure diagram of the top cover shown is after the third plastic part is folded 180 degrees relative to the second plastic part.

[0032] Reference numerals:

[0033] 1. Housing; 11. Mounting slot; 2. Battery cell; 21. Tab;

[0034] 3. Top cover; 31. Cover body; 311. Opening; 32. Pole; 33. Plastic part; 34. Metal block; 35. First plastic part; 36. Adapter; 37. Second plastic part; 38. Third plastic part; 381. Through hole; 39. Gap. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, this application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0036] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0037] It should be understood that the terms, "upper", "lower", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0038] In addition, the terms "first", "second", etc. are used only for descriptive purposes and should not be construed as implying or suggesting relative importance or an indicated number of the technical features. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0039] In order to make the purpose, technical scheme and advantages of the utility model clearer, the utility model will be further described in detail below with reference to the drawings and examples.

[0040] The utility model embodiment provides a kind of electric device, including multiple batteries.Multiple batteries can directly power supply electric device, also can form power supply device, such as battery module, by parallel connection, series connection or mixed connection mode, to the form of power supply device to power various electric devices.Electric device can be in multiple forms, for example, mobile phone, portable device, notebook computer, electric car, electric vehicle, ship, spacecraft, electric toy, electric tool or various household appliances etc..For example, spacecraft includes airplane, rocket, space shuttle and spaceship etc..Electric toy includes fixed or mobile electric toy, for example, game machine, electric car toy, electric ship toy and electric plane toy etc..Electric tool includes metal cutting electric tool, grinding electric tool, assembly electric tool and railway electric tool, for example, electric drill, electric grinder, electric wrench, electric screwdriver, electric hammer, impact drill, concrete vibrator and electric planer etc.

[0041] The utility model embodiment provides a kind of battery, the battery can be secondary battery, secondary battery refers to the battery that active material is activated and continues to use by the way of charging after battery discharges.Battery can be lithium ion battery, sodium ion battery, sodium lithium ion battery, lithium metal battery, sodium metal battery, lithium sulfur battery, magnesium ion battery, nickel-hydrogen battery, nickel-cadmium battery, lead-acid battery etc., and the present application embodiment is not limited to this.As an example, battery can be cylindrical battery, prism battery, soft package battery or other shape battery, prism battery includes square shell battery, blade-shaped battery, multi-prism battery, multi-prism battery is for example six-prism battery etc., and the present application has no particular limit

[0042] Please see Figures 1 to 5The utility model discloses a battery mainly includes shell 1, electric core 2 and top cap 3, wherein, electric core 2 includes positive plate, negative plate and the diaphragm of setting between positive plate and negative plate, electric core 2 when making, first positive plate, diaphragm and negative plate are stacked up in turn and then are wound up and form the winding type electric core, wherein, the open mounting groove 11 of shell 1 is provided with, and electric core 2 is contained in mounting groove 11, wherein, top cap 3 mainly includes cover plate main part 31 and the pole 32 of connecting on cover plate main part 31, cover plate main part 31 is used for sealing the slot of mounting groove 11, and the pole 32 is used for the welding of the tab 21 of the pole of electric core 2, so that the electrode of electric core 2 can be exported to the pole 32. More specifically, top cap 3 also includes the plastic piece 33 of connecting on cover plate main part 31 and the metal block 34 of setting on the inside of cover plate main part 31 towards electric core 2, metal block 34 and pole 32 conduct heat, that is, when pole 32 rapidly heats up, plastic piece 33 and metal block 34 also heat up following the heating of pole 32, in addition, the melting point of metal block 34 is lower than the melting point of plastic piece 33, and the melting point of metal block 34 is higher than the melting point of the diaphragm inside electric core 2, metal block 34 can be the alloy or metal single substance of low melting point metal element such as Bi, Sn, Pb, In, and the melting point of metal block 34 is preferably between 150 DEG C-300 DEG C.

[0043] Specifically, the inside of the top cap 3 of the present scheme is not provided with a safety structure, to ensure that there is enough overcurrent area inside the battery, thereby ensuring that the battery can be applied to the use requirement of large current, when external short circuit occurs outside the battery, an ultra-large current will be generated, the pole 32 of the battery will rapidly increase in temperature due to the thermal effect of the current, and the temperature of the metal block 34 and the plastic piece 33 in thermal contact with the pole 32 will also rapidly increase, when the temperature value of the metal block 34 reaches its melting point, the metal block 34 will melt and fall down, since the melting point of the diaphragm inside the electric core 2 is lower than that of the metal block 34, the falling-down metal block 34 will melt the diaphragm inside the electric core 2, and since the melted metal block 34 still has conductivity, the metal block 34 can conduct the positive plate and the negative plate inside the electric core 2 after melting the diaphragm, so that internal short circuit occurs inside the electric core 2, or, the diaphragm melting the positive plate and the negative plate can cause internal short circuit inside the electric core 2 through direct contact, at this time, the purpose of current diversion is achieved, thereby reducing the current of external short circuit and reducing the temperature rise, and further avoiding the phenomenon of the plastic piece 33 on the battery catching fire, reducing the risk of explosion of the battery and improving the safety of the battery in the use environment of large current. In addition, since the melting point of the metal block 34 is lower than that of the plastic piece 33, when the metal block 34 melts, the plastic piece 33 does not melt, thereby ensuring that internal short circuit occurs inside the electric core 2 in time before the plastic piece 33 catches fire, thereby improving the reliability that the plastic piece 33 will not catch fire.

[0044] Please refer to Figures 2 to 4 The cover plate body 31 is provided with a through hole 311, and the pole column 32 is arranged at the through hole 311. A first plastic part 35 is connected between the pole column 32 and the hole wall of the through hole 311, and the first plastic part 35 is used to insulate and separate the pole column 32 and the cover plate body 31, so as to prevent the direct contact between the electrified pole column 32 and the cover plate body 31, thereby reducing the risk of short circuit of the battery under normal working condition. The plastic part 33 includes the first plastic part 35, and the melting point of the metal block 34 is lower than that of the first plastic part 35, so that the metal block 34 can cause internal short circuit of the internal part of the battery cell 2 in time before the fire occurs, thereby improving the reliability that the first plastic part 35 will not catch fire.

[0045] Please refer to Figures 2 to 5 The top cover 3 of the battery further includes a adapter 36. When the battery is assembled, the adapter 36 can be pre-welded with the tab 21 led out by the battery cell 2, and then the adapter 36 is welded on the pole column 32, so as to realize the purpose that the electrode of the battery cell 2 is led out to the pole column 32. The metal block 34 can be fixed on the bottom of the adapter 36 by welding or heat-conducting adhesive, so that the metal block 34 can be indirectly in thermal contact with the pole column 32 through the adapter 36. Based on the battery structure using the adapter 36, the cover plate body 31 is usually further provided with a second plastic part 37 at the bottom. The second plastic part 37 is arranged between the bottom of the cover plate body 31 and the adapter 36, and is used to insulate and separate the cover plate body 31 and the adapter 36, so as to prevent the direct contact between the adapter 36 and the cover plate body 31, thereby reducing the risk of short circuit of the battery under normal working condition. The plastic part 33 includes the second plastic part 37, and the melting point of the metal block 34 is lower than that of the second plastic part 37, so that the metal block 34 can cause internal short circuit of the internal part of the battery cell 2 in time before the fire occurs, thereby improving the reliability that the second plastic part 37 will not catch fire.

[0046] Preferably, the metal block 34 is arranged at the connection position between the adapter 36 and the pole column 32 or the connection position between the tab 21 and the adapter 36, because the resistance of the two positions is large, and the response speed of temperature rise is fast, so the temperature is the highest in the battery. By arranging the metal block 34 at one of the two positions, the reliability that the metal block 34 can cause internal short circuit of the internal part of the battery cell 2 in time can be further improved, thereby further reducing the risk of fire and explosion of the battery.

[0047] Please refer to Figure 1 and Figure 5Two metal blocks 34 are arranged below the two poles 32, so that when an external short circuit occurs outside the battery, the metal blocks 34 can further improve the reliability of causing an internal short circuit in the battery cell 2 in time, thereby further reducing the risk of fire and explosion of the battery. In other embodiments, only one metal block 34 can be arranged below one pole 32.

[0048] Please refer to Figure 6 and Figure 7 The top cover 3 of the battery further includes a third plastic part 38, which has insulation, is located between the adapter 36 and the battery cell 2, and is used to support the adapter 36. The third plastic part 38 can isolate the battery cell 2 and the adapter 36 to avoid short circuit with the battery cell 2. In addition, the above-mentioned metal block 34 can be designed to be fixed on the third plastic part 38 and located at the position corresponding to the pole 32. In addition, the third plastic part 38 is provided with a through hole 381 at the position corresponding to the metal block 34, which can pass through the through hole 381 and drop downward into the battery cell 2 when the metal block 34 melts. It can be understood that the above-mentioned plastic part 33 includes the third plastic part 38, and the melting point of the above-mentioned metal block 34 is lower than that of the third plastic part 38, so as to ensure that the third plastic part 38 can cause an internal short circuit in the battery cell 2 in time before the fire occurs, thereby improving the reliability that the third plastic part 38 will not catch fire.

[0049] Please refer to Figure 6 , Figure 7 and Figure 9 The metal block 34 is preferably accommodated in the through hole 381, so that the metal block 34 can be hidden in the through hole 381 by the thickness of the third plastic part 38, so as to ensure that the top cover 3 does not occupy too much space in the height direction, thereby ensuring that there is enough height space for the battery cell 2, and further ensuring that the battery has a better energy density. Moreover, the bottom surface of the metal block 34 and the bottom surface of the third plastic part 38 are preferably flush, so as to ensure that the metal block 34 has enough volume, and to ensure that the metal block 34 can melt the diaphragm in the battery cell after melting with high reliability. In addition, the gap 39 between the metal block 34 and the adapter 36 can be coated with an insulating and heat-conducting layer (such as heat-conducting silicone grease), so as to increase the heat-conducting area between the metal block 34 and the adapter 36, thereby improving the speed of the metal block 34 responding to temperature, further improving the reliability of the metal block 34 causing an internal short circuit in the battery cell 2 in time, and further reducing the risk of fire and explosion of the battery.

[0050] Please refer to Figures 6 to 9 As a preferred embodiment, the third plastic part 38 and the second plastic part 37 of the present embodiment are integrally formed, and the third plastic part 38 can be folded 180° relative to the second plastic part 37, Figure 8 is a structural schematic view of the top cover 3 when the third plastic part 38 is unfolded relative to the second plastic part 37, Figure 9 is a structural schematic view of the top cover 3 when the third plastic part 38 has been folded 180° relative to the second plastic part 37, and when the third plastic part 38 is unfolded relative to the second plastic part 37 as shown, Figure 8 at this time, the adapter 36 that has been welded with the tab 21 can be welded on the top of the pole 32, and after the adapter 36 is welded, the third plastic part 38 can be folded 180° relative to the second plastic part 37, so that the third plastic part 38 can be bent below the adapter 36 and separate the adapter 36 and the battery cell 2, thereby achieving the purpose that the top cover 3 can be stably supported by the third plastic part 38, and the top surface of the battery cell 2 will not directly contact the adapter 36. By designing the third plastic part 38 and the second plastic part 37 as an integrated structure and adopting the third plastic part 38 to achieve the design between the adapter 36 and the battery cell 2 through folding, the assembly process of the battery can be simplified, thereby improving the assembly efficiency of the battery.

[0051] Please refer to Figures 6 to 9The top cover 3 in the embodiment preferably comprises two pole columns 32 and two adapters 36, one of the adapters 36 is welded with the positive-polarity tab 21 on the battery cell 2 and welded with one of the pole columns 32, and the other adapter 36 is welded with the negative-polarity tab 21 on the battery cell 2 and welded with the other pole column 32, so that one of the two pole columns 32 is a positive pole column and the other is a negative pole column. Based on the battery with the above structure design, the second plastic part 37 is preferably designed to separate the cover plate body 31 and the two adapters 36 at the same time, so as to ensure that the two adapters 36 cannot directly contact the bottom surface of the cover plate body 31. In addition, the second plastic part 37 is preferably bent with two third plastic parts 38, and the two third plastic parts 38 are arranged at opposite ends of the second plastic part 37 in the length direction of the second plastic part 37, one of the third plastic parts 38 is used to support one of the adapters 36, and the other third plastic part 38 is used to support the other adapter 36. By arranging the two third plastic parts 38 and designing each third plastic part 38 to separately support the corresponding adapter 36, the length of the third plastic part 38 does not need to be too long, and at the same time, the third plastic part 38 can be turned over to the adapter 36 and the battery cell 2 after being bent by 180° in the limited space. After the third plastic part 38 is bent by 180° relative to the second plastic part 37, the third plastic part 38 is fixed to the second plastic part 37 by means of buckle connection, that is, one of the third plastic part 38 and the second plastic part 37 is provided with a male buckle, and the other is provided with a female buckle. By such design, the problem that the third plastic part 38 is caused to pop up the top cover 3 upward due to large internal stress at the bending position can be solved, that is, it is ensured that the top cover 3 will not be inclined and uneven under the support of the third plastic part 38. In addition, one metal block 34 is arranged on each of the two third plastic parts 38, so that when the two third plastic parts 38 are both bent by 180°, the lower part of each of the two pole columns 32 has the metal block 34, so as to ensure that the metal block 34 can timely cause the internal short circuit of the battery cell 2 to occur reliably, and further reduce the risk of fire and explosion of the battery.

[0052] The above is only a preferred embodiment of the present application, and only the technical principle of the present application is specifically described, and these descriptions are only for explaining the principle of the present application, and cannot be explained as the limitation of the protection scope of the present application in any way. Based on the explanation herein, any modification, equivalent replacement and improvement within the spirit and principle of the present application, and other specific embodiments of the present application which can be thought by those skilled in the art without creative labor, should be included in the protection scope of the present application.

Claims

1. A battery top cover, characterized in that: It includes a cover plate body (31), a pole (32), a plastic part (33) and a metal block (34); The plastic part (33) and the pole (32) are respectively connected to the cover body (31); the metal block (34) is arranged on the inner side of the cover body (31) facing the battery cell; the metal block (34) and the pole (32) conduct heat; the melting point of the metal block (34) is lower than the melting point of the plastic part (33); and the melting point of the metal block (34) is higher than the melting point of the diaphragm inside the battery cell; the metal block (34) is used to melt the diaphragm inside the battery cell.

2. The top cover of the battery according to claim 1, wherein: The cover plate body (31) is provided with a through opening (311), the pole (32) is provided at the opening (311), a first plastic part (35) is connected between the pole (32) and the hole wall of the opening (311), the first plastic part (35) is used to insulate and separate the pole (32) and the cover plate body (31), the plastic part (33) includes the first plastic part (35), and the melting point of the metal block (34) is lower than the melting point of the first plastic part (35).

3. The top cover of the battery according to claim 1, wherein: The top cover of the battery further includes a connecting piece (36), the connecting piece (36) being used to connect to the tab led out of the battery cell, and the connecting piece (36) being also used to connect to the pole (32), and the metal block (34) is heat-conducted with the pole (32) by heat conduction with the connecting piece (36).

4. The top cover of the battery according to claim 3, wherein: The plastic part (33) includes a second plastic part (37), which is arranged between the bottom of the cover body (31) and the adapter (36). The second plastic part (37) is used to insulate and separate the cover body (31) and the adapter (36). The melting point of the metal block (34) is lower than the melting point of the second plastic part (37).

5. The top cover of the battery according to claim 3, wherein: The metal block (34) is provided at the connection between the adapter (36) and the pole (32) or at the connection between the pole lug and the adapter (36).

6. The top cover of the battery according to claim 3, wherein: The plastic part further includes a third plastic part (38), the third plastic part (38) being located between the adapter (36) and the battery cell. The metal block (34) is fixed on the third plastic part (38) and located at a position corresponding to the pole (32). The melting point of the metal block (34) is lower than that of the third plastic part (38). The third plastic part (38) is provided with a through hole (381) at a position corresponding to the metal block (34). The through hole (381) is used to allow the metal block (34) to drip downward into the battery cell after melting.

7. The top cover of the battery according to claim 6, wherein: The metal block (34) is accommodated in the through hole (381), and the gap (39) between the metal block (34) and the adapter (36) is coated with a heat-conducting layer.

8. The top cover of the battery according to any one of claims 6 or 7, characterized in that: The top cover further includes a second plastic part (37), the second plastic part (37) being arranged between the bottom of the cover body (31) and the adapter (36), the second plastic part (37) being used to insulate and separate the cover body (31) and the adapter (36), the plastic part (33) including the second plastic part (37), and the melting point of the metal block (34) being lower than the melting point of the second plastic part (37); The second plastic part (37) and the third plastic part (38) are an integral structure, and the third plastic part (38) can be folded 180° relative to the second plastic part (37).

9. A battery, characterized in that: The invention comprises a shell (1), a battery cell (2) and a top cover (3) according to any one of claims 1 to 8, wherein the battery cell (2) comprises a positive electrode sheet, a negative electrode sheet and a diaphragm arranged between the positive electrode sheet and the negative electrode sheet, the shell (1) is provided with an open mounting groove (11), the battery cell (2) is accommodated in the mounting groove (11), the cover body (31) seals the notch of the mounting groove (11), and a pole ear (21) is led out from the battery cell (2), and the pole ear (21) is connected to the pole column (32).

10. An electrical device, characterized in that: Comprising the battery of claim 9.

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