Battery monomer, battery and power-consuming device

Abstract

The present invention relates to a battery cell, a battery and an electric device. The battery cell comprises: a housing having a receiving cavity and a mounting hole connected to the receiving cavity; a battery cell comprising a battery cell body received in the receiving cavity and a pole ear connected to one end of the battery cell body facing the mounting hole; and a pole assembly comprising a pole installed at the mounting hole on the housing, the pole having a through hole, the pole ear comprising a first section connected to the battery cell body and a second section connected to one end of the first section away from the battery cell body, the first section being arranged through the through hole, the second section being located on the side of the pole away from the battery cell body, and being welded and fixed on the pole using a conductive material as solder, the melting point of the conductive material being lower than the melting points of the pole ear and the pole.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

[0002] The fuse structure, also known as the insurance structure, is one of the important structures of the battery cell. When an abnormality occurs inside the battery cell and the temperature is too high, the fuse structure will melt, thereby cutting off the circuit in time and providing protection for the safety of the battery cell. The fuse structure is usually set on the adapter, which is a thin plate structure. The fuse structure is formed by reducing the cross-sectional area of ​​a certain part of the adapter.

[0003] However, in order to improve space utilization, the adapter plate is eliminated in some battery cells, and the pole ear is directly welded to the pole. In the battery cell without the adapter plate, the material of the pole ear is a multi-layer metal foil, which is thin and brittle, and it is impossible to form a fuse structure by reducing the cross-sectional area. The pole is a thick plate structure, and since the pole ear needs to be inserted into the interior of the pole, it is also impossible to form a fuse structure by reducing the cross-sectional area. Therefore, it is a technical difficulty in this field to set up an effective and reliable fuse structure in the battery cell without the adapter plate. Summary of the invention

[0004] Based on this, it is necessary to provide a battery cell, a battery and an electrical device that can form an effective and reliable fuse structure in a battery cell without an adapter to address the above problems.

[0005] In one aspect, the present application provides a battery cell, comprising:

[0006] The housing has a receiving cavity and a mounting hole communicating with the receiving cavity;

[0007] A battery cell, comprising a battery cell body accommodated in the accommodation cavity and a tab connected to one end of the battery cell body facing the mounting hole; and

[0008] A pole assembly comprises a pole mounted at the mounting hole on the outer shell, the pole having a through hole, the pole ear comprising a first section connected to the battery cell body and a second section connected to an end of the first section away from the battery cell body, the first section being arranged to pass through the through hole, the second section being located on a side of the pole away from the battery cell body and being welded and fixed to the pole using a conductive material as solder, the melting point of the conductive material being lower than the melting points of the pole ear and the pole.

[0009] In some embodiments, a side of the pole facing away from the battery body has a groove arranged around the through hole, and the second section is welded and fixed in the groove using the conductive material as solder.

[0010] In some embodiments, the groove includes a deep area and a shallow area respectively located on opposite sides of the through hole; in the vertical direction, the height of the bottom surface of the deep area relative to the battery cell body is lower than the height of the bottom surface of the shallow area relative to the battery cell body;

[0011] The second section is fixed to the shallow area of ​​the groove by welding using the conductive material as solder.

[0012] In some of the embodiments, the height difference between the bottom surface of the deep area and the bottom surface of the shallow area in the vertical direction is 0.1 mm to (2 / 3)×T; wherein T is the height of the pole in the vertical direction.

[0013] In some embodiments, the bottom surface of the groove is an inclined surface that slopes downward from the shallow area to the deep area.

[0014] In some embodiments, the inclination angle of the inclined surface relative to the horizontal plane is 3° to 45°.

[0015] In some embodiments, the pole further has a blocking portion located between the groove and the through hole, and the blocking portion is arranged around the through hole.

[0016] In some embodiments, the first segment includes a first subsegment and a second subsegment, one end of the first subsegment is connected to the battery cell body, the other end of the first subsegment is connected to one end of the second subsegment, and the other end of the second subsegment is connected to the second segment;

[0017] The first sub-segment is arranged to pass through the through hole, and the second sub-segment is bent relative to the first sub-segment to the blocking portion;

[0018] The pole assembly further includes a first insulating layer, a portion of the first insulating layer is located between an inner wall of the through hole and the first sub-segment, and another portion of the first insulating layer is located between the blocking portion and the second sub-segment.

[0019] In some embodiments, the pole assembly further includes a pole cover, which is disposed on a side of the pole away from the battery cell body to cover the groove and the through hole.

[0020] In some embodiments, the pole assembly further includes a second insulating layer disposed on a side of the pole cover plate facing the pole ear.

[0021] In some embodiments, the pole assembly further comprises an insulating block disposed in the groove, the insulating block is provided with a plurality of through holes, and each of the through holes penetrates the top surface and the bottom surface of the insulating block;

[0022] The second section is fixed on the top surface of the insulating block by welding using the conductive material as solder, the through hole is filled with the conductive material, and the second section is electrically connected to the pole through the conductive material filled in the through hole.

[0023] In some of the embodiments, a guide groove communicating with each of the through holes is formed on the bottom surface of the insulating block, and the guide groove passes through at least one end of the insulating block.

[0024] In some embodiments, a plurality of flow holes are formed on the second section, each of the flow holes is connected to the corresponding through hole, and the conductive material is filled in the flow holes.

[0025] In some embodiments, the second section is adhered to the top surface of the insulating block by insulating glue.

[0026] On the other hand, the present application also provides a battery, comprising a battery cell as described in any of the above embodiments.

[0027] On the other hand, the present application also provides an electrical device, including a battery cell as described in any of the above embodiments or a battery as described in any of the above embodiments.

[0028] Compared with the prior art, this application has the following beneficial effects:

[0029] In the above-mentioned battery cell, battery and electrical device, the pole ear of the battery cell is led out to the side of the pole away from the battery cell body through the through hole opened on the pole, and is fixed to the side of the pole away from the battery cell body by welding with conductive material as solder, so that the pole ear is fixed and electrically connected to the pole through the conductive material, thereby avoiding the use of adapters to achieve electrical connection between the pole ear and the pole, which is beneficial to improving space utilization and energy density of battery cells. Since the melting point of the conductive material is lower than the melting point of the pole ear and the pole, when the battery is abnormal and the temperature is too high (that is, the temperature reaches the melting point of the conductive material), the conductive material is affected by the high temperature and melts, so that the connection between the pole ear and the pole is loosened, the flow area is reduced, the resistance is increased, and the heat generation is more intense, and finally the second section of the pole ear is melted and the circuit is cut off, which is beneficial to improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An exploded view of a battery cell in one embodiment of the present application;

[0031] Figure 2 for Figure 1 A cross-sectional view of a battery cell is shown;

[0032] Figure 3 for Figure 2 A partial enlarged view of the battery cell at A shown;

[0033] Figure 4 for Figure 1 The schematic diagram of the assembly structure of the pole, the pole ear and the insulating block of the battery cell shown;

[0034] Figure 5 for Figure 1 Schematic diagram of the assembly structure of the pole, pole ear and insulating block of the battery cell shown (conductive material omitted);

[0035] Figure 6 for Figure 5 A schematic diagram of the structure of the pole of the battery cell shown;

[0036] Figure 7 for Figure 5 Schematic diagram of the structure of the insulating block shown. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0043] An embodiment of the present application provides an electrical device that uses the following battery or battery cell as its power source. Specifically, the electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0044] The battery includes a box and a battery cell, and the battery cell is contained in the box. The box is used to provide a storage space for the battery cell. The box can adopt a variety of structures and a variety of shapes, such as a rectangular parallelepiped. In the battery, there can be multiple battery cells, and the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are both connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole composed of multiple battery cells is contained in the box; of course, the battery can also be a battery module composed of multiple battery cells connected in series, in parallel, or in mixed connection, and multiple battery modules are then connected in series, in parallel, or in mixed connection to form a whole, and contained in the box. The battery can also include other structures. For example, the battery can also include a confluence component for realizing electrical connection between multiple battery cells. Each battery cell can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to this.

[0045] The specific structure of the battery cell is described in detail below with reference to the accompanying drawings. Figure 1 An exploded view of a battery cell in an embodiment of the present application; Figure 2 for Figure 1 A cross-sectional view of a battery cell is shown; Figure 3 for Figure 2 A partial enlarged view of the battery cell at position A shown; Figure 4 for Figure 3 The schematic diagram of the assembly structure of the pole and the pole ear of the battery cell shown; Figure 5 for Figure 4 Schematic diagram of the assembly structure of the pole, pole ear and insulating block of the battery cell shown (conductive material omitted); Figure 6 for Figure 5 The schematic diagram of the structure of the pole shown; Figure 7 for Figure 5 For the convenience of description and understanding, the accompanying drawings only show structures related to the present application.

[0046] See also Figures 1 to 3In an embodiment of the present application, a battery cell includes a housing 10, a battery cell 20 and a pole assembly 30. The housing 10 has a receiving cavity 112 and a mounting hole 121 connected to the receiving cavity 112. The battery cell 20 includes a battery cell body 22 received in the receiving cavity 112 and a pole ear 21 connected to one end of the battery cell body 22 facing the mounting hole 121. The pole assembly 30 includes a pole 31 installed at the mounting hole 121 on the housing 10, and the pole 31 has a through hole 312. The pole ear 21 includes a first section 212 connected to the battery cell body 22 and a second section 214 connected to one end of the first section 212 away from the battery cell body 22. The first section 212 of the pole ear 21 is arranged to pass through the through hole 312 on the pole 31, so that the second section 214 of the pole ear 21 is located on the side of the pole 31 away from the battery cell body 22. The second section 214 of the tab 21 is fixed to the pole 31 by welding with the conductive material 33 as solder, so that the second section 214 of the tab 21 is electrically connected to the pole 31 through the conductive material 33. The melting point of the conductive material 33 is lower than that of the tab 21 and the pole 31.

[0047] In this way, the tab 21 of the battery cell 20 is led out to the side of the pole 31 away from the battery cell body 22 through the through hole 312 opened on the pole 31, and is fixed to the side of the pole 31 away from the battery cell body 22 by welding with the conductive material 33 as solder, so that the tab 21 is fixed and electrically connected to the pole 31 through the conductive material 33, thereby avoiding the use of the adapter to achieve the electrical connection between the tab 21 and the pole 31, which is beneficial to improve the space utilization rate and the energy density of the battery cell. Since the melting point of the conductive material 33 is lower than the melting point of the tab 21 and the pole 31, when the battery is abnormal and the temperature is too high (that is, the temperature reaches the melting point of the conductive material 33), the conductive material 33 is affected by the high temperature and melts, so that the connection between the tab 21 and the pole 31 is loosened, the flow area is reduced, the resistance is increased, and the heat generation is more intense, and finally the second section 214 of the tab 21 is melted and the circuit is cut off, which is beneficial to improve the safety of the battery.

[0048] It should be noted that since resistance is inversely proportional to the flow area, the smaller the flow area, the greater the resistance, the greater the heat generation, and the easier it is to fuse; the smaller the flow area, the smaller the resistance, and the stronger the flow capacity. The fuse structure requires a small flow area, and on the contrary, a large flow area is required to achieve a large current output. Therefore, the fuse structure in the prior art cannot take into account both achieving a large current output and ensuring safety. In the battery cell of this embodiment, on the one hand, since the pole ear 21 and the pole column 31 are welded by using the conductive material 33 as solder, that is, the pole ear 21 is electrically connected to the pole column 31 through the conductive material 33, the provision of the conductive material 33 greatly increases the flow area, thereby reducing the resistance, and further improving the ability of the battery cell to output large currents; on the other hand, since the melting point of the conductive material 33 is relatively low, when an abnormality occurs in the battery and the temperature reaches the melting point of the conductive material 33, the conductive material 33 melts, causing the connection between the pole ear 21 and the pole column 31 to loosen, greatly reducing the flow area, increasing the resistance, and aggravating the heat generation, and finally causing the second section 214 of the pole ear 21 to fuse and cut off the circuit, ensuring the safety of the battery. In other words, the battery cell of this embodiment has the characteristics of both strong ability to output large currents and strong safety.

[0049] It should also be noted that, optionally, the material of the pole lug 21 can be aluminum, the material of the pole post 31 can also be aluminum, and the conductive material 33 can be tin. Of course, the pole lug 21, the pole post 31 and the conductive material 33 can also be made of other materials, as long as the melting point of the conductive material 33 is lower than the melting point of the pole lug 21 and the pole post 31, and this is not limited here.

[0050] See also Figure 3 to Figure 4 As shown, in the embodiment of the present application, the side of the pole 31 away from the battery body 22 has a groove 314 arranged around the through hole 312 (see Figure 6 ), the second section 214 of the tab 21 is fixed in the groove 314 by welding with the conductive material 33 as solder. In this way, when the conductive material 33 melts into a liquid or molten state, the groove 314 is used to accommodate the liquid or molten conductive material 33, thereby preventing the liquid or molten conductive material 33 from overflowing to other positions and causing a short circuit, further improving the safety of the battery.

[0051] Furthermore, the groove 314 on the pole 31 includes a deep area 314a and a shallow area 314b, and the deep area 314a and the shallow area 314b are respectively located on opposite sides of the through hole 312. Figure 2 In the vertical direction in the figure), the bottom surface a of the deep area 314a is lower than the bottom surface b of the shallow area 314b relative to the battery body 22 (see Figure 6) relative to the height of the battery cell body 22. The second section 214 of the pole tab 21 is fixed in the shallow area 314b of the groove 314 by welding with the conductive material 33 as solder. In this way, when the conductive material 33 melts, the liquid or molten conductive material 33 flows from the shallow area 314b of the groove 314 to the deep area 314a under the action of its own gravity. Since the conductive material 33 connecting the second section 214 of the pole tab 21 and the pole 31 flows away, the flow area between the second section 214 of the pole tab 21 and the pole 31 is reduced, the resistance is increased, and the heat generation increases sharply. The second section 214 of the pole tab 21 is heated and melted to cut off the circuit, ensuring the safety of the battery.

[0052] In some embodiments, the height difference between the bottom surface a of the deep area 314a and the bottom surface b of the shallow area 314b in the vertical direction is 0.1 mm to (2 / 3)×T. Wherein, T is the height of the pole 31 in the vertical direction, in mm. In this way, on the one hand, it is ensured that the groove 314 can accommodate the second section 214 of the pole lug 21 and the conductive material 33 to prevent the conductive material 33 from overflowing; on the other hand, it is ensured that the conductive material 33 can quickly flow to the deep area 314a after melting, so as to ensure that the circuit can be cut off in time.

[0053] In other embodiments, the bottom surface of the groove 314 is an inclined surface that slopes downward from the shallow area 314b to the deep area 314a, that is, the depth of the groove 314 gradually increases from the shallow area 314b to the deep area 314a. Preferably, the inclination angle of the inclined surface relative to the horizontal plane is 3° to 45°. In this way, on the one hand, it is ensured that the groove 314 can accommodate the second section 214 of the tab 21 and the conductive material 33 to prevent the conductive material 33 from overflowing; on the other hand, the conductive material 33 can flow quickly to the deep area 314a of the groove 314 after melting, ensuring that the circuit can be cut off in time.

[0054] Specifically in the embodiment, the pole 31 further has a blocking portion 316 located between the groove 314 and the through hole 312, and the blocking portion 316 is arranged around the through hole 312. In this way, when the conductive material 33 melts, the blocking portion 316 can prevent the liquid or molten conductive material 33 from flowing from the through hole 312 on the pole 31 to the battery body 22, greatly improving the safety of the battery cell.

[0055] It should be noted that the height dimension of the blocking portion 316 can be set according to actual conditions. For example, the height H of the blocking portion 316 satisfies: TH ≥ 0.3 mm. As long as it can block the liquid or molten conductive material 33 from flowing into the through hole 312 of the pole 31 and does not affect the assembly of the pole 31, it is not limited here.

[0056] Specifically in the embodiment, the first section 212 of the pole tab 21 includes a first sub-segment 2123 and a second sub-segment 2125. One end of the first sub-segment 2123 is connected to the battery body 22, the other end of the first sub-segment 2123 is connected to one end of the second sub-segment 2125, and the other end of the second sub-segment 2125 is connected to the second section 214 of the pole tab 21. The first sub-segment 2123 of the pole tab 21 is arranged to penetrate the through hole 312 of the pole column 31, and the second sub-segment 2125 of the pole tab 21 is bent relative to the first sub-segment 2123 to the blocking portion 316, so that the second section 214 connected to the second sub-segment 2125 extends to the shallow area 314b of the groove 314.

[0057] The pole assembly 30 further includes a first insulating layer 393, a portion of which is located between the inner wall of the through hole 312 and the first sub-segment 2123, and another portion of the first insulating layer 393 is located between the blocking portion 316 and the second sub-segment 2125, so that the first sub-segment 2123 and the second sub-segment 2125 of the pole tab 21 are insulated from the pole 31 by the first insulating layer 393, so as to avoid the circuit being unable to be cut off due to the contact between the first sub-segment 2123 and / or the second sub-segment 2125 of the pole tab 21 and the pole 31, that is, to ensure that the circuit can be cut off in time after the conductive material 33 is hot-melted, further improving the safety of the battery. It should be noted that the first insulating layer 393 can be an insulating film formed on the inner wall of the through hole 312 and the surface of the blocking portion 316, and of course, it can also be an insulating sheet arranged between the first sub-segment 2123 and the inner wall of the through hole 312 and between the second sub-segment 2125 and the blocking portion 316, as long as it can play an insulating role, it is not limited here.

[0058] Specifically in the embodiment, the pole assembly 30 also includes a pole cover 35, which is covered on the side of the pole 31 away from the battery cell body 22 to cover the groove 314 and the through hole 312 on the pole 31, so that the pole cover 35 is used to protect the conductive material 33 and the pole ear 21, and also to prevent external water vapor or foreign matter from entering the battery cell through the through hole 312.

[0059] Furthermore, the pole assembly 30 also includes a second insulating layer 394 disposed on the side of the pole cover 35 facing the pole lug 21, so that the pole cover 35 and the pole lug 21 are insulated by the second insulating layer 394, so as to avoid the circuit being unable to be cut off due to the second sub-segment 2125 and / or the second segment 214 of the pole lug 21 contacting the pole cover 35, that is, to ensure that the circuit can be cut off in time after the conductive material 33 is hot-melted, further improving the safety of the battery. It should be noted that the second insulating layer 394 can be an insulating film formed on the surface of the side of the pole cover 35 facing the battery body 22, and of course, it can also be an insulating sheet disposed between the pole cover 35 and the second segment 214 and the second sub-segment 2125 of the pole lug 21, as long as it can play an insulating role, it is not limited here.

[0060] In the embodiment of the present application, the pole assembly 30 further includes an insulating block 39 disposed in the shallow area 314b of the groove 314, and the insulating block 39 is provided with a plurality of through holes 391, each through hole 391 passing through the top surface and the bottom surface of the insulating block 39. The second section 214 of the pole tab 21 is welded and fixed on the top surface of the insulating block 39 using the above-mentioned conductive material 33 as solder, and the through holes 391 on the insulating block 39 are filled with the conductive material 33, so that the second section 214 of the pole tab 21 is electrically connected to the pole 31 through the conductive material 33 filled in each through hole 391. In this way, when an abnormality occurs in the battery and the temperature is too high (that is, the temperature reaches the melting point of the conductive material 33), the conductive material 33 is affected by the high temperature and melts, and the liquid or molten conductive material 33 flows from the through hole 391 of the insulating block 39 to the deep area 314a of the groove 314, so that there is no conductive material 33 in the through hole 391 of the insulating block 39, and then the second section 214 of the pole ear 21 is completely separated and insulated from the pole 31 by the insulating block 39, so that the circuit is cut off in time, shortening the time required to cut off the short circuit, and further improving the safety of the battery. Optionally, the diameter of each through hole 391 can be 0.5mm to 3mm. Specifically, the diameter of the through hole 391 can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm or 3mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0061] It should be noted that the provision of the insulating block 39 eliminates the risk of the second section 214 of the tab 21 contacting the pole 31 again after the circuit is cut off, further improving the safety of the battery. The insulating block 39 can be made of a high temperature resistant insulating material that is not affected by the high temperature of welding, and is not limited here.

[0062] See also Figure 7As shown, further, the bottom surface of the insulating block 39 is provided with a guide groove 392 connected to each through hole 391. The guide groove 392 runs through at least one end of the insulating block 39, so that the liquid or molten conductive material 33 formed after melting flows from each through hole 391 into the guide groove 392, and then flows out from the space between the guide groove 392 and the bottom surface of the groove 314 until it flows to the deep area 314a of the groove 314. The provision of the guide groove 392 is conducive to the liquid or molten conductive material 33 in each through hole 391 flowing out from the bottom of the insulating block 39, avoiding the situation that the liquid or molten conductive material 33 in the through hole 391 cannot be discharged and the circuit cannot be cut off in time.

[0063] It should be noted that the number of guide grooves 392 on the bottom surface of the insulating block 39 is designed according to the arrangement of each through hole 391, and can be one or more, as long as it is conducive to the discharge of the liquid or molten conductive material 33 in each through hole 391, and is not limited here. In a specific embodiment, a plurality of guide grooves 392 are provided on the bottom surface of the insulating block 39, each guide groove 392 extends along the length direction of the insulating block 39 and passes through the two end surfaces of the insulating block 39 in the length direction, and each guide groove 392 is arranged at intervals along the width direction of the insulating block 39. The width of each guide groove 392 can be 1 / 2 of the diameter of the through hole 391, or the width of each guide groove 392 is between 0.5 mm and 5 mm, as long as the liquid or molten conductive material 33 in each through hole 391 can be discharged smoothly, and is not limited here. Specifically, the width of the guide groove can be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, but is not limited to the listed values, and other unlisted values ​​within the numerical range are also applicable.

[0064] It should also be noted that in the axial direction of the through hole 391, the diameter of the through hole 391 is gradually increased or decreased, so that the inner wall of the through hole 391 is in an inclined state, which is conducive to ensuring the electrical connection effect between the second section 214 of the pole lug 21 and the pole 31 on the one hand, and is conducive to reducing the risk of the liquid or molten conductive material 33 being blocked in the through hole 391 on the other hand. Of course, in other embodiments, the diameter of the through hole 391 can also be reduced or increased in sections, or the diameter of some sections can be reduced or increased, and the diameter of other sections remains unchanged, as long as it can facilitate the discharge of the liquid or molten conductive material 33, and no special limitation is made here.

[0065] Please continue to see Figure 4 and Figure 5Specifically in the embodiment, a plurality of flow holes 2141 are formed on the second section 214 of the tab 21 , each flow hole 2141 is connected to a through hole 391 on the insulating block 39 , and the flow hole 2141 is filled with a conductive material 33 . In this way, on the one hand, it is beneficial to increase the contact area between the second section 214 of the pole lug 21 and the conductive material 33, thereby increasing the flow area between the second section 214 of the pole lug 21 and the pole 31, and improving the flow capacity; on the other hand, by opening a plurality of flow holes 2141 on the second section 214 of the pole lug 21, the conductive material 33 located on the upper surface of the pole lug 21 and in the flow holes 2141 can be melted and can flow to the bottom of the insulating block 39 through the flow holes 2141 on the second section 214 and the through holes 391 on the insulating block 39 in sequence, and then be discharged from the guide groove 392 at the bottom of the insulating block 39, and finally flow to the deep area 314a of the groove 314, so that the second section 214 of the pole lug 21 and the pole 31 are completely separated by the insulating block 39 between the two, that is, the circuit is cut off in time, thereby ensuring the safety of the battery.

[0066] It should be noted that before welding, the second section 214 of the pole lug 21 is located on the top surface of the insulating block 39. Since the two are not fixed, the position of the second section 214 of the pole lug 21 is prone to deviation or even detach from the top surface of the insulating block 39, thereby causing poor welding. Similarly, after the conductive material 33 melts and cuts off the circuit, since the second section 214 of the pole lug 21 is not fixed to the insulating block 39 at this time, the position of the second section 214 of the pole lug 21 is prone to deviation or even detach from the top surface of the insulating block 39, and there is a risk of secondary overlap with the pole 31, that is, the safety of the battery is reduced. In order to overcome the above defects, in some embodiments, the second section 214 of the pole lug 21 is attached to the top surface of the insulating block 39 by insulating glue, so that the second section 214 of the pole lug 21 is always fixed on the top surface of the insulating block 39, avoiding the phenomenon that the second section 214 of the pole lug 21 is positionally deviated or even detached from the top surface of the insulating block 39.

[0067] It is understandable that, in actual use, when the battery or battery cell needs to be repaired and the circuit needs to be cut off, the conductive material 33 can be heated so that the conductive material 33 melts and flows to the deep area 314a of the groove 314, thereby cutting off the circuit. After the repair or other operation is completed, the conductive material 33 flowing to the deep area 314a of the groove 314 is heated again to melt it into a liquid or molten state, and the battery cell is tilted so that the liquid or molten conductive material 33 flows to the shallow area 314b of the groove 314 again. As the temperature decreases, the conductive material 33 gradually solidifies, and the electrical connection between the second section 214 of the pole ear 21 and the pole 31 is re-established, that is, the circuit is turned on. In this way, multiple disconnections and connections of the circuit in the battery cell can be achieved.

[0068] See also Figure 1 As shown, in the embodiment of the present application, there are two pole column assemblies 30, and there are also two pole ears 21 on the battery body 22, and the two pole column assemblies 30 are arranged one by one with the two pole ears 21. One of the two pole ears 21 is a positive pole ear, and the other is a negative pole ear, so that the pole column 31 connected to the positive pole ear is the positive electrode of the battery cell, and the pole column 31 connected to the negative pole ear is the negative electrode of the battery cell, that is, the pole columns 31 of the two pole column assemblies 30 serve as the positive electrode and the negative electrode of the battery cell respectively, and jointly realize the input and output of electric energy of the battery cell.

[0069] Furthermore, the housing 10 includes a shell 11 and a cover plate 12, the inner cavity of the shell 11 is the above-mentioned receiving cavity 112, and the shell 11 also has an opening 114 connected to the receiving cavity 112. The cover plate 12 is covered at the opening 114 to close the receiving cavity 112. Two mounting holes 121 are provided on the cover plate 12, and the poles 31 of the two pole assemblies 30 are respectively insulated and mounted at the two mounting holes 121 on the cover plate 12, and the poles 31 of the two pole assemblies 30 are respectively electrically connected to the two pole ears 21 through the conductive material 33.

[0070] Furthermore, each pole assembly 30 further includes an insulating member 37 disposed between the pole 31 and the cover plate 12 , so that the pole 31 and the cover plate 12 are insulated by the insulating member 37 to prevent the cover plate 12 from being charged.

[0071] It should be noted that the assembly of the housing 11 and the cover plate 12 and the assembly of the pole 31 , the insulating member 37 and the cover plate 12 can all adopt relatively mature existing technologies, so they will not be described in detail here.

[0072] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery cell, characterized in that: include: The housing (10) has a receiving cavity (112) and a mounting hole (121) communicating with the receiving cavity (112); A battery cell (20) comprising a battery cell body (22) accommodated in the accommodation cavity (112) and a pole ear (21) connected to one end of the battery cell body (22) facing the mounting hole (121); and A pole assembly (30) comprising a pole (31) mounted at the mounting hole (121) on the housing (10), the pole (31) having a through hole (312), the pole ear (21) comprising a first section (212) connected to the battery cell body (22) and a second section (214) connected to an end of the first section (212) away from the battery cell body (22), the first section (212) being arranged to pass through the through hole (312), the second section (214) being located on a side of the pole (31) away from the battery cell body (22), and being welded and fixed to the pole (31) using a conductive material (33) as solder, the conductive material (33) having a melting point lower than the melting points of the pole ear (21) and the pole (31); The pole (31) has a groove (314) arranged around the through hole (312) on a side facing away from the battery body (22); the second section (214) is fixed in the groove (314) by welding using the conductive material (33) as solder; The pole assembly (30) further comprises an insulating block (39) arranged in the groove (314), the insulating block (39) being provided with a plurality of through holes (391), each of the through holes (391) penetrating the top surface and the bottom surface of the insulating block (39); the second section (214) is fixed on the top surface of the insulating block (39) by welding using the conductive material (33) as solder, the conductive material (33) being filled in the through holes (391), and the second section (214) is electrically connected to the pole (31) via the conductive material (33) filled in the through holes (391).

2. The battery cell according to claim 1, characterized in that: The groove (314) comprises a deep area (314a) and a shallow area (314b) respectively located on opposite sides of the through hole (312); in the vertical direction, the height of the bottom surface of the deep area (314a) relative to the battery cell body (22) is lower than the height of the bottom surface of the shallow area (314b) relative to the battery cell body (22); The second section (214) is fixed to the shallow area (314b) of the groove (314) by welding using the conductive material (33) as solder.

3. The battery cell according to claim 2, characterized in that: The height difference between the bottom surface of the deep area (314a) and the bottom surface of the shallow area (314b) in the vertical direction is 0.1 mm to (2 / 3)×T; wherein T is the height of the pole (31) in the vertical direction.

4. The battery cell according to claim 2, characterized in that: The bottom surface of the groove (314) is an inclined surface that slopes downward from the shallow area (314b) to the deep area (314a).

5. The battery cell according to claim 4, characterized in that: The inclination angle of the inclined surface relative to the horizontal plane is 3° to 45°.

6. The battery cell according to claim 1, characterized in that: The pole (31) further comprises a blocking portion (316) located between the groove (314) and the through hole (312), and the blocking portion (316) is arranged around the through hole (312).

7. The battery cell according to claim 6, characterized in that: The first section (212) comprises a first sub-section (2123) and a second sub-section (2125), one end of the first sub-section (2123) is connected to the battery cell body (22), the other end of the first sub-section (2123) is connected to one end of the second sub-section (2125), and the other end of the second sub-section (2125) is connected to the second section (214); The first sub-segment (2123) is arranged to penetrate the through hole (312), and the second sub-segment (2125) is bent relative to the first sub-segment (2123) to the blocking portion (316); The pole assembly (30) further comprises a first insulating layer (393), a portion of the first insulating layer (393) being located between an inner wall of the through hole (312) and the first sub-segment (2123), and another portion of the first insulating layer (393) being located between the blocking portion (316) and the second sub-segment (2125).

8. The battery cell according to claim 1, characterized in that: The pole assembly (30) further comprises a pole cover plate (35), wherein the pole cover plate (35) is arranged to cover a side of the pole (31) away from the battery cell body (22) so as to cover the groove (314) and the through hole (312).

9. The battery cell according to claim 8, characterized in that: The pole assembly (30) further comprises a second insulating layer (394) arranged on a side of the pole cover plate (35) facing the pole ear (21).

10. The battery cell according to claim 1, characterized in that: The bottom surface of the insulating block (39) is provided with a guide groove (392) connected to each of the through holes (391), and the guide groove (392) passes through at least one end of the insulating block (39).

11. The battery cell according to claim 1, characterized in that: The second section (214) is provided with a plurality of circulation holes (2141), each of the circulation holes (2141) being connected to a corresponding through hole (391), and the circulation holes (2141) are filled with the conductive material (33).

12. The battery cell according to claim 1, characterized in that: The second section (214) is adhered to the top surface of the insulating block (39) by means of insulating glue.

13. A battery, characterized in that: The invention comprises a battery cell as claimed in any one of claims 1 to 12.

14. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 12 or the battery according to claim 13.

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