Pole, battery monomer, battery and electric device

Abstract

The utility model belongs to the technical field of batteries, and discloses a pole, a battery monomer, a battery and an electric device, the pole is provided with a tab fixing space for fixing a tab, and the pole comprises a pole body and a plug-in; the pole body is provided with a slot, the plug-in unit is arranged in the slot, and the tab fixing space is formed between the plug-in unit and the slot wall of the slot. The pole provided by the utility model has relatively low impedance. The battery monomer comprises a shell, a battery cell accommodated in the shell and the pole, the pole is arranged in the shell in an insulating manner, the battery cell comprises a tab, and the tab is fixed in the tab fixing space. The single battery provided by the utility model has relatively low impedance, so that the battery comprising the single battery and the electric equipment have relatively low impedance, and the requirements of high-power discharge and quick charge are met.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a pole, a battery cell, a battery and an electrical device. Background Art

[0002] The fast charging and high-power discharge capabilities of power batteries are two important parameters of power batteries. The realization of high-power discharge and fast charging of batteries requires that the battery has lower impedance, and the material and mechanical structure must have better current capacity. When the battery is discharged at high power, it can be known that for most power batteries, the heat is most serious at the ear through the implantation of temperature sensing wire monitoring at various positions inside the battery combined with infrared thermal imaging, which brings uncertainty to the long-term performance and safety of the battery.

[0003] In the prior art, the connection process between the tab and the pole includes: first ultrasonically welding the multiple layers of tabs together, then connecting them to the adapter by laser welding, and finally connecting the adapter to the pole by laser welding. Since there are many welding steps when connecting the tab and the pole, and the adapter needs to be set, the welding internal resistance of the power battery is large, which cannot meet the requirements of high-power discharge and fast charging.

[0004] Therefore, a low-impedance connection method between the pole ear and the pole is urgently needed. Utility Model Content

[0005] The utility model aims to provide a pole with lower connection impedance.

[0006] As conceived above, the technical solution adopted by the utility model is:

[0007] A pole, wherein the pole has a pole lug fixing space for fixing a pole lug, and the pole comprises a pole body and a plug-in;

[0008] The pole body is provided with a slot, the plug-in is placed in the slot, and the pole ear fixing space is formed between the plug-in and the slot wall of the slot.

[0009] Optionally, the plug-in is configured to cooperate with a slot wall of the slot and clamp the pole ear therebetween.

[0010] Optionally, the tab fixing space is provided with one, the plug-in includes an extrusion surface, and the tab fixing space is formed between the extrusion surface and the connecting groove wall of the slot; or,

[0011] There are multiple tab fixing spaces, the plug-in includes multiple extrusion surfaces, the slot includes multiple connecting groove walls corresponding to the multiple extrusion surfaces one by one, and one tab fixing space is formed between the extrusion surface and the corresponding connecting groove wall.

[0012] Optionally, the extrusion surface is parallel to the corresponding connecting groove wall.

[0013] Optionally, the length of the slot in the second direction gradually increases or decreases along a first direction, the first direction is perpendicular to the second direction, and the first direction is a height direction of the pole.

[0014] Optionally, the plug-in includes two extrusion surfaces, the two extrusion surfaces correspond to two connecting groove walls opposite to the slot one by one, and a tab fixing space is formed between each extrusion surface and the corresponding connecting groove wall;

[0015] The angle between the two extrusion surfaces is β, 15°≤β≤150°.

[0016] Optionally, the cross-section of the plug in the third direction is triangular; the length of the plug in the third direction is greater than the length of the tab in the third direction.

[0017] Optionally, an end surface of the plug-in close to one end of the inner side surface of the pole body is an arc surface.

[0018] Optionally, the pole body, the plug-in and the tab are welded together to form a welding portion in the tab fixing space, and the welding portion is at least partially located inside the pole body, at least partially located inside the tab, and at least partially located inside the plug-in.

[0019] Optionally, the penetration depth of the weld is L1, 2 / 5e≤L1≤4 / 5e, wherein e represents the length of the pole body in the first direction; and / or

[0020] The weld width of the weld is L2, L2≥1.5b, wherein b represents the thickness of the tab connected by the weld; and / or

[0021] The length of the welding portion in the third direction is greater than or equal to the length of the electrode tab in the third direction.

[0022] Optionally, the tab fixing space is provided in plurality, and the welding portion is provided in each tab fixing space;

[0023] The plurality of welding parts are independent of each other; or at least two of the plurality of welding parts are connected into one body.

[0024] Optionally, the material of the pole body is the same as that of the plug-in; or,

[0025] The material of the pole body is different from that of the plug-in, and the absolute value of the difference between the melting point of the pole body and the melting point of the plug-in is less than or equal to a preset value.

[0026] The utility model aims to provide a battery cell with lower impedance.

[0027] As conceived above, the technical solution adopted by the utility model is:

[0028] A battery cell comprises a shell, a battery cell accommodated in the shell and the pole as described above, wherein the pole is insulated and arranged in the shell, and the battery cell comprises a pole lug, which is fixed in the pole lug fixing space.

[0029] The utility model aims to provide a battery with lower impedance.

[0030] As conceived above, the technical solution adopted by the utility model is:

[0031] A battery comprises the battery cell as described above.

[0032] The utility model aims to provide an electrical device having lower impedance.

[0033] As conceived above, the technical solution adopted by the utility model is:

[0034] An electrical device comprising the battery as described above.

[0035] Beneficial effects of the utility model:

[0036] The pole provided by the utility model has a pole body with a slot, a plug-in can be placed in the slot, and a pole ear fixing space is formed between the plug-in and the slot wall, the pole ear extends into the pole ear fixing space, and the pole ear, the pole body and the plug-in are welded from the side of the pole body facing away from the battery cell, thereby realizing direct welding of the pole ear and the pole, without the need to set up an adapter, so that the welding internal resistance of the pole and the pole ear can be small, which can meet the needs of high-power discharge and fast charging and has high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a cross-sectional schematic diagram of a pole provided by an embodiment of the utility model;

[0038] Figure 2 It is a bottom view of the pole and the pole ear provided in the embodiment of the utility model;

[0039] Figure 3 It is a top view of a pole and a pole ear provided in an embodiment of the utility model;

[0040] Figure 4This is a battery cell assembly process provided by the embodiment of the utility model Figure 1 ;

[0041] Figure 5 This is a battery cell assembly process provided by the embodiment of the utility model Figure 2 ;

[0042] Figure 6 This is a battery cell assembly process provided by the embodiment of the utility model Figure 3 ;

[0043] Figure 7 This is another battery cell assembly process diagram provided by an embodiment of the utility model;

[0044] Figure 8 It is a structural schematic diagram of another battery cell provided by an embodiment of the utility model;

[0045] Fig. 9 This is another battery cell assembly process diagram provided by an embodiment of the utility model;

[0046] Fig.10 This is a structural schematic diagram of another battery cell provided by an embodiment of the utility model.

[0047] In the figure:

[0048] 100, pole body; 101, outer side; 102, inner side; 110, slot; 120, connecting slot wall; 200, plug-in; 210, extrusion surface; 300, pole ear fixing space; 400, battery cell; 410, pole ear; 500, welding part; 600, laser center. DETAILED DESCRIPTION

[0049] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, rather than all of them.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0052] In the present utility model, unless otherwise clearly stipulated and limited, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, the first feature being "above", "above" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature. In the description of this embodiment, unless otherwise specified, "multiple" specifically refers to two or more.

[0053] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0054] In the prior art, in order to reduce the accumulation of welding internal resistance, a direct welding process for the pole lugs is also used. Specifically, the direct welding process for the pole lugs refers to eliminating the adapter and directly welding the multi-layer pole lugs welded together to the pole by laser. However, the pole lugs after super welding cannot be absolutely flat. When laser welding with the pole, there will be air in the uneven places, resulting in laser explosion points and large-area virtual welding, which makes the welding process of the pole lugs and poles more difficult and has a lower yield.

[0055] Embodiment 1

[0056] This embodiment provides a pole, which is used to directly connect with the pole lug of the battery, without the need for an adapter, and can have a lower connection impedance. In addition, the probability of cold welding is reduced, so that the yield rate of welding between the pole lug and the pole is higher, the welding difficulty is reduced, and the welding part of the battery is prevented from being detached during the subsequent manufacturing or use process.

[0057] like Figures 1 to 10As shown, the pole has a pole ear fixing space 300. The pole ear fixing space 300 is used to fix the pole ear 410 of the battery cell 400. Figure 1 As shown, the pole includes a pole body 100 and an insert 200. It should be noted that the pole lug 410 is usually provided in plurality, and it is understandable that the pole lug 410 may also be one, and this embodiment does not limit this.

[0058] Among them, Figure 2 As shown, the pole body 100 is provided with a slot 110, the plug-in 200 can be placed in the slot 110, and a tab fixing space 300 is formed between the plug-in 200 and the slot wall of the slot 110, and the tab 410 located in the tab fixing space 300 can contact the slot wall of the plug-in 200 and the slot 110, so as to facilitate the welding of the tab 410, the plug-in 200 and the pole body 100. It should be noted that there can be one or more tabs 410 in the tab fixing space 300, and this embodiment is not limited thereto.

[0059] It should also be noted that the slot 110 is arranged along the height direction of the pole body 100 (i.e., the first direction in the figure) through the pole body 100, so that the pole lug 410 can extend into the slot 110 from one side in the height direction of the pole body 100, and it is also convenient to weld the pole lug 410, the plug-in 200 and the pole body 100 from the other side in the height direction of the pole body 100. It should be noted that, if Figure 6 As shown, the pole body 100 has an inner side surface 102 and an outer side surface 101 in the height direction thereof, wherein the inner side surface 102 is the side facing the battery cell 400 and the outer side surface 101 is the side facing away from the battery cell 400. The slot 110 extends from the outer side surface 101 to the inner side surface 102.

[0060] When connecting the pole and the tab 410, in some optional embodiments, the plug-in 200 can be placed in the slot 110 to form the tab fixing space 300, and then the tab 410 is inserted into the tab fixing space 300. The top of the tab 410 can be flush with the outer side 101 of the pole body 100 or not. Finally, the tab, the pole and the plug-in 200 are welded. In other optional embodiments, such as Figure 4 As shown, the pole lug 410 can also be first extended into the slot 110, and the top of the pole lug 410 can be flush with the outer side surface 101 of the pole body 100 or not, and then the plug-in 200 is inserted into the slot 110 so that the pole lug 410 is located between the slot wall of the slot 110 and the plug-in 200, and finally the pole lug, the pole and the plug-in 200 are welded.

[0061] The pole provided in this embodiment has a pole body 100 with a slot 110, and the plug-in 200 can be placed in the slot 110, and a pole ear fixing space 300 is formed between the plug-in 200 and the slot 110 The wall, the pole ear 410 extends into the pole ear fixing space 300, and the pole ear 410, the pole body 100 and the plug-in 200 are welded from the side of the pole body 100 facing away from the battery cell 400, thereby realizing direct welding of the pole ear 410 and the pole, without the need to set an adapter, so that the welding internal resistance between the pole and the pole ear 410 can be small, which can meet the needs of high-power discharge and fast charging, and has high safety.

[0062] Optionally, the plug-in 200 is configured to cooperate with the slot wall of the slot 110 and clamp the tab 410 between the two, so that the tab 410 can be relatively flat, prevent the presence of air in the welding area, and prevent the generation of laser explosion points, thereby reducing the probability of cold welding and the difficulty of welding, and improving the welding yield of the tab 410, the pole body 100 and the plug-in 200. In addition, by clamping the tab 410 with the slot wall of the plug-in 200 and the slot 110, the initial fixation of the tab 410 can be achieved, preventing the tab 410 from moving during the welding process, further reducing the difficulty of welding, and ensuring the welding effect.

[0063] Further optionally, the assembly sequence is to first place the tab 410 in the slot 110 and then place the plug-in 200. Figure 5 As shown, an external force F can be applied to the plug 200 to ensure that the pole body 100, the plug 200 and the tab 410 are in close contact, so that the plug 200 and the slot wall of the slot 110 cooperate with each other and clamp the tab 410 therebetween. For example, the external force F satisfies: 5000N≥F≥100N.

[0064] In some optional embodiments, one or more tab fixing spaces 300 may be provided.

[0065] When there is one tab fixing space 300, the plug 200 includes an extrusion surface 210, and a tab fixing space 300 is formed between the extrusion surface 210 and a connecting slot wall 120 of the slot 110. One or more tabs 410 are inserted into the tab fixing space 300 for fixing. For example, the extrusion surface 210 is a side surface of the plug 200.

[0066] It should be noted that when one tab fixing space 300 is provided, the side surfaces of the plug 200 except the extrusion surface 210 are welded one by one with the groove walls of the slot 110 except the connecting groove wall 120 to form a more sealed pole.

[0067] When there are multiple tab fixing spaces 300, the plug-in 200 includes multiple extrusion surfaces 210, and the slot 110 includes multiple connecting slot walls 120 corresponding to the multiple extrusion surfaces 210. A tab fixing space 300 is formed between each extrusion surface 210 and its corresponding connecting slot wall 120. Multiple tabs 410 are provided, and each tab fixing space 300 fixes at least one tab 410. By providing multiple tab fixing spaces 300, multiple tabs 410 can be grouped and fixed, and the number of tabs 410 in each group is small, which facilitates the plug-in 200 to cooperate with the slot wall of the slot 110 to extrude and fix the tabs 410.

[0068] It should be noted that the thickness direction of the tab 410 in the tab fixing space 300 is perpendicular to at least one of the extrusion surface 210 and the connecting groove wall 120, so that the volume of the tab fixing space 300 can be smaller, thereby reducing the workload of subsequent welding.

[0069] Optionally, the extrusion surface 210 is parallel to the corresponding connecting groove wall 120, so that the distance between the extrusion surface 210 and the corresponding connecting groove wall 120 is equal at all positions. On the one hand, the force on the pole ear 410 located between the two can be made more uniform, thereby reducing the probability of damaging the pole ear 410; on the other hand, the pole ear 410 has a larger contact area with the extrusion surface 210 and the connecting groove wall 120, respectively, which improves the reliability of clamping the pole ear 410, and can squeeze out the air between the pole ears 410 and the pole ears 410, further preventing the existence of air in the welding area, and further reducing the probability of cold welding and the difficulty of welding.

[0070] For example, in order to improve the degree of adaptation between the slot 110 and the pole lug 410, the length direction of the slot 110 is the third direction, the width direction of the slot 110 is the second direction, and the depth direction of the slot 110 is the first direction. Any two of the first direction, the second direction and the third direction are perpendicular to each other. When the pole body 100 is used as a reference, the first direction is the height direction of the pole body 100, the second direction is the width direction of the pole body 100, and the third direction is the length direction of the pole body 100.

[0071] In some optional embodiments, such as Figure 4 As shown, the length of the slot 110 in the second direction gradually increases along the first direction, that is, the width of the top of the slot 110 is greater than the width of the bottom thereof, so that the slot wall of the slot 110 in the second direction is an inclined slot wall. At this time, the plug-in 200 is inserted into the slot 110 from the side of the pole body 100 away from the battery cell 400. When the plug-in 200 applies an extrusion force, it can be supported and guided by the inclined slot wall to improve the extrusion effect. In addition, when inserting the plug-in 200, the tab 410 can be arranged close to the inclined slot wall, which can reduce the probability of the plug-in 200 pushing the tab 410 out of the slot 110 and improve the assembly success rate.

[0072] In some other optional embodiments, such as Fig. 9 As shown, the length of the slot 110 in the second direction gradually decreases along the first direction, that is, the width of the top of the slot 110 is smaller than the width of the bottom thereof, and the slot wall of the slot 110 in the second direction can also be an inclined slot wall. At this time, the plug 200 is inserted into the slot 110 from the pole body 100 toward the side of the battery cell 400. When the plug 200 applies an extrusion force, it can be supported and guided by the inclined slot wall to improve the extrusion effect.

[0073] Alternatively, if Figure 1 As shown, the plug-in 200 includes two extrusion surfaces 210. The two extrusion surfaces 210 correspond one-to-one to two connecting groove walls 120 opposite to the slot 110. For example, the two extrusion surfaces 210 correspond one-to-one to two connecting groove walls 120 opposite to the slot 110 in the second direction.

[0074] A tab fixing space 300 is formed between each extrusion surface 210 and its corresponding connecting groove wall 120 . At this time, two tab fixing spaces 300 are provided, and the two tab fixing spaces 300 are arranged in the second direction.

[0075] Please continue to see Figure 1 The angle between the two extrusion surfaces 210 is β, 15°≤β≤150°, so as to improve the effect of extruding the tab 410, and further improve the connection effect between the tab 410 and the pole body 100. For example, β=15°, 30°, 45°, 60°, 90°, 120°, 150°, etc., but the present embodiment is not limited thereto.

[0076] It should be noted that when the extrusion surface 210 and its corresponding connecting groove wall 120 are parallel to each other, the angle between the two connecting groove walls 120 is also β, 15°≤β≤150°. When β is too large, the volume of the pole will increase, the thickness of the pole will be too thin, the difficulty of pole processing will increase, the insulation performance will be reduced, and the problem of insufficient melting depth will occur. When β is too small, the difficulty of pole processing will also increase, and the difficulty of assembly will increase. The fixture cannot install the plug-in 200 in place, the operation is difficult, the actual manufacturability is low, and the cost is increased.

[0077] Optionally, the cross section of the plug-in 200 in the third direction is triangular, that is, the plug-in 200 is in the shape of a triangular prism, which can facilitate the design and manufacture of the plug-in 200 on the one hand; on the other hand, when the plug-in 200 is inserted into the slot 110, the multiple tabs 410 do not need to be pre-divided, and one corner of the plug-in 200 can be inserted into the middle of the multiple tabs 410, so that the multiple tabs 410 can be naturally divided into two parts. Specifically, the cross section of the plug-in 200 in the third direction can be a right triangle, an acute triangle, or an obtuse triangle, which is not limited in this embodiment.

[0078] Of course, it is understandable that the cross-section of the plug-in 200 in the third direction may also be a polygon, such as a trapezoid or other shapes, which is not limited in this embodiment.

[0079] Further optionally, the end surface of the plug 200 close to the inner side surface 102 of the pole body 100 is an arc surface to prevent the plug 200 from poking the pole ear 410 when inserted into the slot 110, thereby improving the reliability of assembly.

[0080] Alternatively, if Figure 3 As shown, the length of the plug 200 in the third direction is greater than the length of the pole lug 410 in the third direction, so as to ensure sufficient squeezing of the pole lug 410, avoid the situation where the pole lug 410 is not squeezed due to no contact with the plug 200, and thus avoid the problem of cold welding caused by the gap between the pole lugs 410, and further improve the connection effect between the pole lug 410 and the pole.

[0081] It should be noted that the two ends of the plug 200 in the third direction respectively abut against the two groove walls of the slot 110 in the third direction, which on the one hand improves the assembly stability of the plug 200 in the slot 110, and on the other hand reduces the welding area to improve the welding efficiency.

[0082] Alternatively, if Figure 6 As shown, the pole body 100, the plug-in 200 and the pole tab 410 are welded and connected, and a welding portion 500 is formed in the pole tab fixing space 300. During the welding process, the pole body 100, the pole tab 410 and the plug-in 200 are all melted, and the melted parts are fused to form the welding portion 500, that is, the welding portion 500 is at least partially located inside the pole body 100, at least partially located inside the pole tab 410, and at least partially located inside the plug-in 200. Connecting the pole body 100, the plug-in 200 and the pole tab 410 by welding can improve the connection reliability of the pole body 100, the plug-in 200 and the pole tab 410, so that the pole body 100, the plug-in 200 and the pole tab 410 are connected into an integrated structure through the welding portion 500, thereby improving the integrity of the pole. For example, the pole body 100, the plug-in 200 and the pole tab 410 can be connected by laser welding or the like.

[0083] In some optional embodiments, such as Figure 1 As shown, the penetration depth of the welding portion 500 is L1, wherein L1 satisfies: 2 / 5e≤L1≤4 / 5e, and e represents the length of the pole body 100 in the first direction. The size of L1 is limited so that a larger area of ​​the pole lug 410 can be melted without excessive penetration, thereby reducing the probability of cold welding and improving welding reliability.

[0084] Please continue to see Figure 1, the weld width of the welding portion 500 is L2, and L2 satisfies: L2 ≥ 1.5b, where b represents the thickness and of the tab 410 connected by the welding portion 500. The size of L2 is limited so that the weld width of the welding portion 500 can fully cover the tab 410, thereby ensuring the welding strength and reducing the probability of leaking welding and cold welding.

[0085] It should be noted that during welding, the position of the laser center 600 needs to be determined based on the position of the pole lug 410. Figure 3 As shown, the laser center 600 is located directly above the pole tab 410 , and the pole body 100 , the plug 200 , and the pole tab 410 are laser welded using the gap between the plug 200 and the pole body 100 to determine the welding trajectory.

[0086] In order to ensure the welding effect, the length of the welding portion 500 in the third direction is greater than or equal to the length of the pole lug 410 in the third direction, so that the welding portion 500 can completely cover the pole lug 410, further reducing the occurrence of cold welding. It should be noted that the welding portion 500 also needs to fill the gap between the pole lug 410 and the plug-in 200 and the pole body 100, and between the plug-in 200 and the pole body 100, so as to ensure the sealing of the pole.

[0087] It should be noted that laser welding is performed from the outer side surface 101 of the pole body 100, so that the material of the outer side surface 101 is melted first and used to form the welding portion 500, that is, the welding portion 500 will extend to the outer side surface 101 of the pole body 100, so that the outer side surface 101 of the pole body 100 can be relatively flat.

[0088] Alternatively, if Figure 6 As shown, when a plurality of tab fixing spaces 300 are provided, a welding portion 500 is provided in each tab fixing space 300 to ensure the fixing effect of the tab 410 in each tab fixing space 300 .

[0089] In some optional embodiments, such as Figure 6 As shown, the multiple welding parts 500 are independent of each other, that is, any two welding parts 500 do not contact each other. In this case, multiple welding devices can be used for welding respectively to improve welding efficiency. It should be noted that when the distance between the openings of the two tab fixing spaces 300 on the outer side surface 101 is large, the multiple welding parts 500 can be made independent of each other to reduce welding difficulty and welding cost. It should be noted that in this embodiment, the distance between the openings of the two tab fixing spaces 300 on the outer side surface 101 is large, corresponding to the case where β is large.

[0090] In some other optional embodiments, such as Figure 8 or Fig.10As shown, at least two of the multiple welding parts 500 are connected as one. This arrangement is suitable for when the distance between the openings of the two tab fixing spaces 300 on the outer side surface 101 is small. At this time, when the weld width L2 of the welding part 500 meets the requirements, the two welding parts 500 will inevitably be connected as one. It should be noted that in this embodiment, the distance between the openings of the two tab fixing spaces 300 on the outer side surface 101 is small, corresponding to the case where β is large. It should also be noted that, if Fig.10 As shown, when the distance between the openings of the two tab fixing spaces 300 on the outer side surface 101 is smaller or the length of the slot 110 in the second direction gradually decreases along the first direction, the tabs 410 in the two tab fixing spaces 300 can be fixed by a laser device, thereby improving assembly efficiency.

[0091] In this embodiment, when there is only one terminal lug 410, the length of the slot 110 located on the inner side 102 of the terminal body 100 in the second direction (ie Figure 1 a) is greater than or equal to the thickness of the tab 410 , so that the tab 410 can smoothly extend into the slot 110 .

[0092] When there are multiple pole lugs 410, the length of the slot 110 located on the inner side 102 of the pole body 100 in the second direction (i.e. Figure 1 a) in the figure is greater than or equal to the sum of the thicknesses of the plurality of tabs 410 , so that the plurality of tabs 410 can smoothly extend into the slot 110 .

[0093] Optionally, the length of the slot 110 in the third direction (ie Figure 2 c) is greater than or equal to the length of the tab 410 in the third direction (i.e. Figure 2 d) in the figure, so that the tab 410 can smoothly extend into the slot 110.

[0094] Optionally, the material of the pole body 100 and the plug 200 is the same or different. The pole body 100 may be made of at least one of gold, silver, platinum, copper, aluminum, tin, iron, nickel, alloy, etc.; similarly, the plug 200 may be made of at least one of gold, silver, platinum, copper, aluminum, tin, iron, nickel, alloy, etc.

[0095] When the material of the pole body 100 is the same as that of the plug-in 200 , a better welding effect can be achieved.

[0096] When the material of the pole body 100 is different from that of the plug 200, the absolute value of the difference between the melting point of the pole body 100 and the melting point of the plug 200 is less than or equal to the preset value to ensure the welding effect. The preset value ranges from 500°C to 600°C. For example, the preset value is 500°C, 200°C, 100°C, 600°C, etc. This embodiment is only listed and is not limited to this. If the absolute value of the difference between the melting point of the pole body 100 and the melting point of the plug 200 is too large, the weld 500 is very likely to crack during laser welding.

[0097] The pole provided in this embodiment has at least the following advantages:

[0098] (1) When the pole tab 410 extends into the slot 110, if there are multiple pole tabs 410, the plug-in 200 is inserted into the pole tab 410, and the pole tab 410 is automatically divided into two parts, which can eliminate the pre-ultrasonic welding process of the multi-layer pole tab 410, which can greatly improve the production quality rate and efficiency and reduce costs. The specific reason is that the pre-ultrasonic welding process is to fix the multi-layer pole tab 410 together in advance, otherwise the multi-layer pole tab 410 needs to be pressed by a fixture before laser welding; but the downward position of the fixture will affect the laser welding position, which increases the difficulty of the welding operation; in this embodiment, the plug-in 200 can be pressed down to press the multi-layer pole tab 410, and the laser welding directly welds the plug-in 200 and the pole tab 410 into one, and the plug-in 200 will not affect the laser, which can greatly improve the production quality rate and efficiency;

[0099] (2) In the prior art, if the multi-layer tab 410 is directly laser welded, the laser heat needs to penetrate the multi-layer medium layer by layer, and the laser welding effect is greatly reduced; in this embodiment, the welding position is located at the end surface of the multi-layer tab 410, and the multi-layer tab 410 is heated at the same time to form a molten pool (i.e., the welding portion 500), and the welding effect is better;

[0100] (3) The connecting groove wall 120 and the extrusion surface 210 are inclined surfaces, so that the contact area between the tab 410 and the pole body 100 is increased, and the parts are partially melted into one after laser welding, which increases the flow area of ​​the tab 410 and the pole, greatly reduces the contact resistance and welding resistance between the tab 410 and the pole body 100, and is conducive to high-power discharge and fast charging of batteries using the pole;

[0101] (4) Since the tab 410 is embedded in the pole body 100, the design size of the tab 410 is shorter than that of a conventional tab, which reduces the electron transmission path, further reduces the internal ohmic resistance and heat generation, and is also beneficial to high-power discharge and fast charging of the battery;

[0102] (5) The pole is installed on the top cover. When the battery cell and the top cover are assembled, the pole ear 410 part does not need to be folded compared with the conventional pole ear. Therefore, there is no possibility of contact with the metal shell when entering the shell. The pole ear protection glue can be eliminated, which reduces costs and improves efficiency.

[0103] Embodiment 2

[0104] This embodiment provides a battery cell having lower connection impedance.

[0105] The battery cell comprises a housing (not shown), a battery cell 400 contained in the housing, and a pole as in Embodiment 1. It should be noted that the battery cell provided in this embodiment has the same beneficial effects as the pole in Embodiment 1, which will not be described in detail.

[0106] The pole is insulated and arranged in the outer shell, and the battery cell 400 includes a pole ear 410 , and the pole ear 410 is fixed in the pole ear fixing space 300 .

[0107] It should be noted that the housing includes a housing body and a top cover, the battery cell 400 is accommodated in the housing body, and the top cover is buckled with the opening of the housing body. The pole is insulated and arranged on the top cover. In other practicable embodiments, the pole can also be insulated and arranged on the housing body, which is not limited in this embodiment.

[0108] In the battery cell provided in the present embodiment, a slot 110 is provided on the pole body 100, and the plug-in 200 can be placed in the slot 110, and a pole ear fixing space 300 is formed between the plug-in 200 and the slot 110 wall, and the pole ear 410 extends into the pole ear fixing space 300. The pole ear 410, the pole body 100 and the plug-in 200 are welded from the side of the pole body 100 facing away from the battery cell 400, thereby realizing direct welding of the pole ear 410 and the pole without setting an adapter, so that the welding internal resistance between the pole and the pole ear 410 can be small, which can meet the needs of high-power discharge and fast charging and has high safety.

[0109] Optionally, when the number of layers of the tabs 410 is greater than 30, the multiple tabs 410 are divided into two, two tab fixing spaces 300 are provided, and each tab fixing space 300 has one tab 410. When the number of layers of the tabs 410 is less than or equal to 30, multiple tabs 410 can be placed in one tab fixing space 300.

[0110] It should be noted that the battery cell 400 includes two groups of pole lugs 410 with opposite polarities. Correspondingly, there are also two poles, and one group of pole lugs 410 corresponds to one pole.

[0111] Embodiment 3

[0112] This embodiment provides a battery, including the battery cell described in Embodiment 2. The battery provided in this embodiment has a relatively low connection impedance and can be used for high-power discharge and fast charging.

[0113] Embodiment 4

[0114] This embodiment provides an electrical device, including the battery as described in the third embodiment, which has a lower connection impedance and can be used for high-power discharge and fast charging.

[0115] The electrical device may be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The car may be a fuel car, a gas car or a new energy car, and the new energy car may be a pure electric car, a hybrid car or an extended-range car, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. This embodiment does not limit this.

[0116] Embodiment 5

[0117] This embodiment provides a battery cell, such as Figure 4 As shown, the tabs 410 of the two battery cells 400 are placed in the slots 110 of the pole body 100. The tabs 410 of the two battery cells 400 are respectively attached to the connecting slot walls 120 of the slots 110, the thickness of the tab 410 of each battery cell 400 is 2 mm, the length of the tab 410 is 20 mm, and the width of the slot 110 is 4.2 mm and the length is 22 mm.

[0118] Next, the plug-in 200 is installed, wherein the β of the plug-in 200 is 60°, such as Figure 5 As shown, a downward pressure of 1500N is applied, that is, F=1500N, so as to closely fit the plug-in 200, the tab 410 and the pole body 100, while exhausting the air between the tabs 410 as much as possible.

[0119] The plug-in 200, the pole body 100 and the pole ear 410 are welded by laser welding. Figure 6 As shown, the position of the pole ear 410 is the laser center 600, and the welding track is determined by the gap between the pole body 100 and the plug 200. The height of the pole body 100 is 5 mm, and the welded portion 500 obtained by welding has a penetration depth of 2500 μm and a weld width of 4000 μm.

[0120] In some optional embodiments, when the battery cell includes only one battery cell 400 , the tab 410 of the battery cell 400 may also adopt the connection solution provided in this embodiment.

[0121] Embodiment 6

[0122] This embodiment provides a battery cell, such as Figure 7 As shown, the pole ear 410 of a battery cell 400 is placed in the slot 110 position, and the pole ear 410 extends into the slot 110. The thickness of the pole ear 410 of a single battery cell 400 is 4 mm, the length of the pole ear 410 is 20 mm, and the length of the slot 110 located on the inner side 102 of the pole body 100 in the second direction is 4.2 mm, and the length of the slot 110 is 22 mm.

[0123] Next, the plug-in 200 is installed. The β of the plug-in 200 is 15°. The obvious difference from the fifth embodiment is that the β of the plug-in 200 is very small, that is, the insertion angle of the plug-in 200 is very sharp. For the multi-layer thick tab 410, there is no need to pre-divide it into two parts and place it on the connecting groove wall 120. It only needs to be inserted in the middle of the tab 410 with a sharp angle, and the plug-in 200 will naturally divide the multi-layer tab 410 into two parts. Apply a downward pressure of 1000N to the plug-in 200, that is, F=1000N, so as to closely fit the plug-in 200, the tab 410 and the pole body 100, and at the same time, exhaust the air between the tabs 410 as much as possible.

[0124] The plug-in 200, the tab 410 and the pole body 100 are welded by laser welding, with the tab 410 as the laser center 600 and the welding track determined by the joint gap between the pole body 100 and the plug-in 200. The thickness of the pole body 100 is 5 mm, and the welded portion 500 obtained by welding has a penetration depth of 2500 μm and a weld width of 4000 μm.

[0125] Embodiment 7

[0126] like Fig. 9 and Fig.10 As shown, the difference between this embodiment and the fifth embodiment is that the plug-in 200 is inverted and inserted from the inner side 102 of the pole body 100. The advantage is that laser welding only needs to weld one track to complete the assembly.

[0127] In this embodiment, the laser welding process is specifically different in that the weld depth of the welded portion 500 in this embodiment is 3000 μm and the weld width is 6000 μm.

[0128] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention is described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A pole, characterized in that: The pole has a pole lug fixing space (300) for fixing a pole lug (410), and the pole includes a pole body (100) and an insert (200); The pole body (100) is provided with a slot (110), the plug-in (200) is placed in the slot (110), and the pole lug fixing space (300) is formed between the plug-in (200) and the slot wall of the slot (110).

2. The pole according to claim 1, characterized in that: The plug-in unit (200) is configured to cooperate with the slot wall of the slot (110) and clamp the pole ear (410) therebetween.

3. The pole according to claim 1, characterized in that: The tab fixing space (300) is provided with a, the plug-in unit (200) includes an extrusion surface (210), and the tab fixing space (300) is formed between the extrusion surface (210) and the connecting groove wall (120) of the slot (110); or, The tab fixing spaces (300) are provided in plurality, the plug-in unit (200) comprises a plurality of extrusion surfaces (210), the slot (110) comprises a plurality of connection groove walls (120) corresponding one-to-one to the plurality of extrusion surfaces (210), and a tab fixing space (300) is formed between the extrusion surfaces (210) and the corresponding connection groove walls (120).

4. The pole according to claim 3, characterized in that: The extrusion surface (210) is parallel to the corresponding connecting groove wall (120).

5. The pole according to claim 4, characterized in that: The length of the slot (110) in the second direction gradually increases or decreases along the first direction, the first direction is perpendicular to the second direction, and the first direction is the height direction of the pole.

6. The pole according to claim 3, characterized in that: The plug-in unit (200) comprises two extrusion surfaces (210), the two extrusion surfaces (210) correspond one-to-one to two connecting groove walls (120) opposite to the slot (110), and a tab fixing space (300) is formed between each extrusion surface (210) and its corresponding connecting groove wall (120); The included angle between the two extrusion surfaces (210) is β, 15°≤β≤150°.

7. The pole according to claim 3, characterized in that: The cross-section of the plug-in (200) in the third direction is triangular; the length of the plug-in (200) in the third direction is greater than the length of the tab (410) in the third direction.

8. The pole according to claim 3, characterized in that: The end surface of the plug-in (200) close to one end of the inner side surface (102) of the pole body (100) is an arc surface.

9. The pole according to any one of claims 1 to 8, characterized in that: The pole body (100), the plug-in (200) and the pole tab (410) are welded together to form a welding portion (500) in the pole tab fixing space (300), and the welding portion (500) is at least partially located inside the pole body (100), at least partially located inside the pole tab (410), and at least partially located inside the plug-in (200).

10. The pole according to claim 9, characterized in that: The penetration depth of the welding portion (500) is L1, 2 / 5e≤L1≤4 / 5e, wherein e represents the length of the pole body (100) in the first direction; and / or The weld width of the welding portion (500) is L2, L2 ≥ 1.5b, wherein b represents the thickness of the electrode tab (410) connected to the welding portion (500); and / or The length of the welding portion (500) in the third direction is greater than or equal to the length of the electrode tab (410) in the third direction.

11. The pole according to claim 9, characterized in that: The tab fixing space (300) is provided in plurality, and the welding portion (500) is provided in each tab fixing space (300); The plurality of welding parts (500) are independent of each other; or, at least two welding parts (500) among the plurality of welding parts (500) are connected into one body.

12. The pole according to claim 9, characterized in that: The material of the pole body (100) is the same as the material of the plug-in (200); or, The material of the pole body (100) is different from the material of the plug-in (200), and the absolute value of the difference between the melting point of the pole body (100) and the melting point of the plug-in (200) is less than or equal to a preset value.

13. A battery cell, characterized in that: It comprises a shell, a battery cell (400) accommodated in the shell, and a pole according to any one of claims 1 to 12, wherein the pole is insulated and arranged in the shell, and the battery cell (400) comprises a pole lug (410), and the pole lug (410) is fixed in the pole lug fixing space (300).

14. A battery, characterized in that Comprising the battery cell as claimed in claim 13.

15. An electrical device, characterized in that: Comprising the battery of claim 14.

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