Battery

Abstract

The invention provides a battery which comprises a pole group, a pole lug, a pole column and a connecting piece, and one end of the pole lug is electrically connected with the pole group; grooves are formed in the end surfaces of the ends, close to the pole groups, of the poles; one end, close to the pole group, of the first side wall of the groove sinks inwards to form a step; the connecting piece is positioned in the groove and is in positioning fit with the step; the step and the connecting piece are fixed through penetration welding to form a welding seam; a first gap is formed between the bottom surface of the groove and the connecting piece, the first gap is used for accommodating a tab, a second gap is formed between the periphery of the connecting piece and the second side wall of the groove, and the tab penetrates through the second gap; the thickness of the connecting piece is T; in the direction perpendicular to the first side wall, the size of the step is W, and W / T is larger than or equal to 1.5 and smaller than or equal to 5. Therefore, according to the battery, the connecting pieces and the tabs are accommodated in the grooves, so that the tabs borrow the height space of the grooves in the pole columns, the space originally occupied by the tabs can be conveniently used for arranging the pole groups, and the energy density of the battery can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology. Background Art

[0002] In the field of energy storage, battery technology is at the core of electric vehicles, portable electronic devices, and renewable energy systems. Its energy density directly determines the endurance, size, and cost of energy storage devices. Despite significant progress in commercial technologies such as lithium-ion batteries in recent years, their energy density remains a fundamental bottleneck, becoming a key technical challenge hindering the development of multiple industries.

[0003] Therefore, how to improve the energy density of batteries is a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Invention

[0004] In view of this, the present application provides a battery that can solve the technical problem of low energy density of batteries.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A battery comprising:

[0007] Pole group;

[0008] a pole lug, one end of which is electrically connected to the pole group;

[0009] A pole, wherein an end surface of the pole column close to one end of the pole group is provided with a groove, and a first side wall of the groove close to one end of the pole group is concave to form a step;

[0010] A connecting piece is located in the groove and is positioned and matched with the step, and the step and the connecting piece are fixed by penetration welding to form a weld;

[0011] In which, there is a first gap between the bottom surface of the groove and the connecting member, the first gap is used to accommodate the pole ear, and there is a second gap between the outer periphery of the connecting member and the second side wall of the groove, the second gap is used to pass the pole ear; the thickness of the connecting member is T; in the direction perpendicular to the first side wall, the size of the step is W, where 1.5≤W / T≤5.

[0012] Optionally, in the above battery, the ratio of the length of all the steps to the sum of the circumferential dimensions of all the side walls of the groove is in the range of 0.3 to 1.

[0013] Optionally, in the above battery, the penetration depth A of the weld on the pole is ≥0.15 mm.

[0014] Optionally, in the above battery, a side of the weld facing away from the electrode axis and close to one end of the electrode group has a minimum distance A1 of ≥0.2 mm from an edge of the connector;

[0015] Alternatively, along a direction parallel to the first side wall and perpendicular to the thickness of the connecting member, the size of the weld is greater than or equal to 1 mm, and the difference between the size of the step and the size of the weld is greater than or equal to 1 mm.

[0016] Optionally, in the above battery, the number of the electrode groups is at least three; the electrode tabs include a first electrode tab and a second electrode tab, and the second gap is used to pass through the first electrode tab;

[0017] The connecting member is provided with a strip-shaped through hole, the extension direction of the strip-shaped through hole is parallel to the second side wall and perpendicular to the thickness direction of the connecting member, the strip-shaped through hole is used to pass through the second pole tab, and the ratio of the width of the strip-shaped through hole to the thickness of the second pole tab is in the range of 5 to 60.

[0018] Optionally, in the above battery, the minimum distance between the inner wall of the strip-shaped through hole and the outer periphery of the connector is greater than or equal to 1 mm and less than or equal to 5 mm.

[0019] Optionally, in the above battery, the electrode group is provided with 2n or 2n-1 electrodes, and n connectors are sequentially provided in a direction perpendicular to the second side wall, where n is a positive integer greater than 1; the electrode tabs include a first electrode tab and a second electrode tab, and the second gap is used to pass through the first electrode tab;

[0020] A third gap is formed between two adjacent connecting members, and the third gap is used for passing the second electrode tab. The ratio of the width of the third gap to the thickness of the second electrode tab is in the range of 2 to 60.

[0021] Optionally, in the above battery, the electrode group is provided with one, and the second gap is provided with one for passing the electrode tab of the electrode group;

[0022] Wherein, the groove includes a first side wall, and the ratio of the length of the step on the first side wall to the length of the first side wall is in a range of 0.5 to 1;

[0023] Alternatively, the groove includes at least two first side walls, and the ratio of the length of the step on each first side wall to the length of the corresponding first side wall is in the range of 0.35 to 1.

[0024] Optionally, in the above battery, there are 2m electrode groups, and two second gaps are provided along a direction perpendicular to the second side wall; the first side wall and the second side wall are perpendicular to each other; m is a positive integer;

[0025] Wherein, the groove includes a first side wall, and the ratio of the length of the step on the first side wall to the length of the first side wall is in a range of 0.5 to 1;

[0026] Alternatively, the groove includes two first side walls arranged opposite to each other, and the ratio of the length of the step on each first side wall to the length of the corresponding first side wall is in the range of 0.35-1.

[0027] Optionally, in the above battery, a chamfer is provided at a connection position between an end face of the electrode column close to one end of the electrode group and the second side wall of the groove; and / or a chamfer is provided at a connection position between an end face of the connector facing away from the electrode group and a side face of the connector close to the second side wall.

[0028] Alternatively, the electrode group is provided with a plurality of electrode tabs, and the minimum distance between the free ends of two adjacent electrode tabs is 0.5 mm ≤ M ≤ 20 mm.

[0029] The battery provided in the present application accommodates the connector through a groove, and the tab can pass through the second gap between the groove and the connector and be accommodated in the first gap between the groove and the connector, so that the tab borrows the height space of the groove in the pole column, so that the space originally occupied by the tab can be used to set the pole group, thereby improving the energy density of the battery; in addition, the part of the tab connected to the connector is separated from the pole group by the connector, which can effectively avoid the situation where the tab is inserted upside down into the pole group. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without any creative work.

[0031] Figure 1 A top view of a battery provided in an embodiment of the present application;

[0032] Figure 2 for Figure 1 aa section in;

[0033] Figure 3 for Figure 2 bb cross-section in;

[0034] Figure 4 A partial cross-sectional view of a battery at the terminal position is provided for an embodiment of the present application;

[0035] Figure 5Provides a structural diagram of a cover plate assembly and a connector for an embodiment of the present application;

[0036] Figure 6 The cover plate assembly and the pole provided in the embodiment of the present application are viewed from above. Figure 1 ;

[0037] Figure 7 The cover plate assembly and the pole provided in the embodiment of the present application are viewed from above. Figure 2 ;

[0038] Figure 8 The cover plate assembly and the pole provided in the embodiment of the present application are viewed from above. Figure 3 ;

[0039] Figure 9 A schematic structural diagram of a connector provided in an embodiment of the present application;

[0040] Figure 10 Schematic diagram of the structure of the electrode group and the connecting member provided in the embodiment of the present application Figure 1 ;

[0041] Figure 11 Schematic diagram of the structure of the electrode group and the connecting member provided in the embodiment of the present application Figure 2 .

[0042] in:

[0043] 11. Pole group; 12. First pole tab; 13. Second pole tab;

[0044] 2. Pole; 21. Groove; 22. Step; 3. Connector; 31. Strip-shaped through hole;

[0045] 4. Weld; 5. Cover assembly. DETAILED DESCRIPTION

[0046] The present application provides a battery.

[0047] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0048] In related art, a battery includes a housing, a pole group disposed within the housing, and pole posts disposed on the housing. A gap exists between the pole group and the pole posts to accommodate the tabs and provide a conductive connection between the tabs and the pole posts. This gap also reduces the risk of a tab being inserted upside down into the pole group. However, this gap occupies the battery's height, resulting in lower internal space utilization and lower energy density. Removing this gap could easily lead to a tab being inserted upside down into the pole group, potentially causing battery failure.

[0049] like Figures 1-11 As shown, an embodiment of the present application provides a battery, which includes a pole group 11, a pole lug, a pole column 2 and a connector 3, wherein one end of the pole lug is electrically connected to the pole group 11; a groove 21 is provided on the end face of the pole column 2 near one end of the pole group 11; and the first side wall of the groove 21 is concave inwardly near one end of the pole group 11 to form a step 22; the connector 3 is located in the groove 21 and is positioned and matched with the step 22; the step 22 and the connector 3 are fixed by penetration welding to form a weld 4; there is a first gap between the bottom surface of the groove 21 and the connector 3, the first gap is used to accommodate the pole lug, and there is a second gap between the outer periphery of the connector 3 and the second side wall of the groove 21, the second gap is used to pass the pole lug; the step 22 can support the connector 3, facilitate the positioning between the two, and facilitate subsequent welding operations. It should be noted that welding the electrode 2 to the step 22 refers to welding the electrode 2 to at least a portion of the step 22, i.e., providing steps 22 in the groove 21, and all steps 22 are welded to the connector 3; alternatively, the steps 22 provided in the groove 21 are divided into welding steps and supporting steps, with the welding steps being used for welding the connector 3 and the supporting steps being used for overlapping the connector 3. Furthermore, the welding steps and supporting steps may be continuous or discontinuous, with the step 22 welded to the connector 3 existing in the groove 21. The connector 3 has a thickness of T; the dimension of the step 22 in a direction perpendicular to the first sidewall is W, where 1.5 ≤ W / T ≤ 5. It should be noted that W / T can be any one of 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.1, 3.2, 3.3, 3.4, 3.5, 3.6, 3.7, 3.8, 3.9, 4, 4.1, 4.2, 4.3, 4.4, 4.5, 4.6, 4.7, 4.8, 4.9, and 5. Furthermore, the shape of the connector 3 includes, but is not limited to, a square, a circle, or a racetrack shape. The following description assumes that the connector 3 is a square.

[0050] The test results of the effect of the specific value of W / T on the welding connection between the pole 2 and the connector 3 are shown in Table 1 below:

[0051] Table 1

[0052]

[0053]

[0054] As can be seen from Table 1, controlling the W / T value can prevent welding difficulties caused by a too small value, which can easily cause the weld 4 to exceed the step 22 during welding, resulting in insufficient welding area. It can also prevent welding failure caused by a too small value, and avoid affecting the tab width caused by a too large value. It should be noted that the height direction tensile test specifically refers to the test of the tensile force between the connector 3 and the terminal 2.

[0055] It can be seen that the embodiment of the present application accommodates the connector 3 through the groove 21, and the tab can pass through the second gap between the groove 21 and the connector 3 and be accommodated in the first gap between the groove 21 and the connector 3, so that the tab borrows the height space of the groove 21 in the pole 2, so that the space originally occupied by the tab can be used to set the pole group 11, thereby improving the energy density of the battery; in addition, the part of the tab connected to the connector 3 is separated from the pole group 11 by the connector 3, which can effectively avoid the situation where the tab is inserted upside down into the pole group 11.

[0056] In a specific implementation, the ratio of the length of all steps 22 to the sum of the circumferential dimensions of all side walls of the groove 21 ranges from 0.3 to 1. It should be noted that the ratio of the length of all steps 22 to the sum of the circumferential dimensions of all side walls of the groove 21 can be any one of 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. This can avoid situations where a ratio is too small, resulting in low utilization of the groove 21, affecting the dimensional design of the pole 2, and failing to meet the flow requirements of the weld 4.

[0057] In a specific implementation, the penetration depth A of the weld 4 on the pole 2 is ≥ 0.15 mm, which can ensure the static load bearing capacity and fatigue resistance of the welding position.

[0058] In specific implementation, the minimum distance A1 between the weld 4 and the edge of the connector 3, which is close to the end of the pole group 11 and away from the axis of the pole 2, is ≥0.2 mm. This avoids the situation where A1 is too small, resulting in positioning difficulties. It can also avoid the occurrence of adverse conditions such as cold welding and explosion points when the gap between the connector 3 and the pole 2 is large.

[0059] The test results of the effects of the specific values ​​of A and A1 on the welding connection between the pole 2 and the connector 3 and on the plastic on the cover assembly 5 are shown in Table 2:

[0060] Table 2

[0061]

[0062] As shown in Table 2, controlling the size of A can prevent problems such as connector 3 failing to meet tensile test requirements after welding due to being too small, and the upper plastic melting due to being too large. Controlling the size of A1 can prevent problems such as cracking on the edge of connector 3 and a welding yield below 0.95 due to being too small, and the tab size being affected due to being too large.

[0063] During specific implementation, the size of the weld is greater than or equal to 1 mm in the direction parallel to the first side wall and perpendicular to the thickness of the connector 3, so as to avoid the situation where the weld size is too small, resulting in insufficient connection strength between the connector and the pole, and the connector 3 falls off, and the difference between the size of the step 22 and the size of the weld 4 is greater than or equal to 1 mm, so as to avoid the situation where the weld 4 exceeds the edge of the step 22 during welding, and there is no support under the connector 3, resulting in serious deformation of the connector 3 and difficulty in welding.

[0064] In a specific implementation, the electrode group 11 is at least three; the electrode tabs include a first electrode tab 12 and a second electrode tab 13, and the second gap is used to pass through the first electrode tab 12; the connector 3 is provided with a strip-shaped through hole 31, and the extension direction of the strip-shaped through hole 31 is parallel to the second side wall and perpendicular to the thickness direction of the connector 3. The strip-shaped through hole 31 is used to pass through the second electrode tab 13, and the ratio of the width of the strip-shaped through hole 31 to the thickness of the second electrode tab 13 is in the range of 5 to 60. Figure 9 and Figure 10 As shown, there are four electrode groups 11, and the connector 3 is provided with a strip-shaped through hole 31. It should be noted that the ratio of the width of the strip-shaped through hole 31 to the thickness of the second electrode tab 13 can be any one of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 35, 40, 45, 50, 55, and 60.

[0065] The test results of the effects of the width of the strip-shaped through hole 31, the thickness of the tab and the thickness of a single pole group 11 on the assembly effect of the pole 2 and the connector 3 are shown in Table 3.

[0066] Table 3

[0067]

[0068] As can be seen from Table 3, controlling the size of the ratio of the width of the strip-shaped through hole 31 to the thickness of the tab can avoid the situation where the tab is too small and the assembly of the tab and the connector 3 is difficult, and can also avoid the situation where the second tab 13 is too large and the second tab 13 is torn.

[0069] In specific implementation, the minimum distance between the inner wall of the strip through hole 31 and the outer periphery of the connector 3 is greater than or equal to 1 mm and less than or equal to 5 mm. The minimum distance between the inner wall of the strip through hole 31 and the outer periphery of the connector 3 can be any one of 1 mm, 2 mm, 3 mm, 4 mm, and 5 mm. The limitation of this distance can ensure that the connector 3 is easily broken due to being too small, and can also avoid the situation where it is too large to affect the size of the tab and the connector 3 and increase the cost.

[0070] In a specific implementation, the electrode group 11 is provided with 2n or 2n-1, and n connectors 3 are sequentially provided in a direction perpendicular to the second side wall, where n is a positive integer greater than 1; the tabs include a first tab 12 and a second tab 13, and the second gap is used to pass through the first tab 12; a third gap is formed between two adjacent connectors 3, and the third gap is used to pass through the second tab 13, and the ratio of the width of the third gap to the thickness of the second tab 13 is in the range of 2 to 60. Figure 11 As shown, four electrode groups 11 are provided and two connectors 3 are provided. It should be noted that the ratio of the width of the third gap to the thickness of the second electrode tab 13 can be any one of 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 35, 40, 45, 50, 55, and 60.

[0071] The test results of the effects of the width of the third gap, the thickness of the tab, and the thickness of a single pole group 11 on the assembly effect of the pole 2 and the connector 3 are shown in Table 4.

[0072] Table 4

[0073]

[0074] As can be seen from Table 4, controlling the ratio of the width of the third gap to the tab thickness can prevent a situation where a large pole group 11 composed of two pole groups 11 is difficult to assemble with another large pole group 11, which can easily damage the tabs, while also preventing a situation where a large gap can cause significant eccentricity in the second tab 13 and cause tab tearing. It should be noted that the pole groups 11 connected by two tabs connected to the same connector 3 form a large pole group.

[0075] In a specific implementation, one groove is provided in the electrode group 11, and one second gap is provided for passing a lug of the electrode group 11. The groove 21 includes a first sidewall, and the ratio of the length of the step 22 on the first sidewall to the length of the first sidewall is in a range of 0.5 to 1. The ratio of the length of the step 22 on the first sidewall to the length of the first sidewall can be any one of 0.5, 0.6, 0.7, 0.8, 0.9, and 1. Limiting this ratio can prevent a situation where the utilization rate of the groove 21 is too small and the size of the electrode 2 is affected, and can also prevent the flow rate from not meeting the requirements after welding. It should be noted that the first side wall can be arranged opposite to the second side wall, in which case the length of the first side wall is U, the length of the step 22 is U1, and 0.5≤U1 / U≤1; or the first side wall is perpendicular to the second side wall and is located at one end of the second side wall along its length direction, in which case the length of the first side wall is L1, the length of the step 22 is L2, and 0.5≤L2 / L1≤1; or the first side wall is perpendicular to the second side wall and is located at the other end of the second side wall along its length direction, in which case the length of the first side wall is L3, the length of the step 22 is L4, and 0.5≤L3 / L4≤1.

[0076] In a specific implementation, the groove 21 includes at least two first side walls, and the ratio of the length of the step 22 on each first side wall to the length of the corresponding first side wall is in the range of 0.35 to 1, wherein the ratio of the length of the step 22 on each first side wall to the length of the corresponding first side wall can be any one of 0.35, 0.4, 0.5, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. The restriction of this ratio can avoid the situation where the utilization rate of the groove 21 is too small and the size of the pole 2 is affected, and it can also avoid the situation where the flow rate after welding does not meet the requirements. It should be noted that two first side walls can be provided, one of which is parallel to the second side wall, and the other is located at one end or the other end along the length direction of the second side wall, in which case 0.35≤U1 / U≤1 and 0.35≤L2 / L1≤1, or 0.35≤U1 / U≤1 and 0.35≤L3 / L4≤1; or, the two first side walls are respectively located at the two ends of the second side wall along the length direction, in which case 0.35≤L2 / L1≤1 and 0.35≤L3 / L4≤1, as shown in FIG. Figure 6 Alternatively, three first side walls are provided, one of which is parallel to the second side wall, and the other two are located at both ends of the second side wall along the length direction. In this case, 0.35≤U1 / U≤1, 0.35≤L2 / L1≤1, and 0.35≤L3 / L4≤1, as shown in FIG. Figure 8 shown.

[0077] In a specific implementation, 2m pole groups 11 are provided, and two second gaps are provided in a direction perpendicular to the second sidewall. The first sidewall and the second sidewall are perpendicular to each other. m is a positive integer. The groove 21 includes a first sidewall, and the ratio of the length of the step 22 on the first sidewall to the length of the first sidewall ranges from 0.5 to 1. The ratio of the length of the step 22 on the first sidewall to the length of the first sidewall can be any one of 0.5, 0.6, 0.7, 0.8, 0.9, and 1. This restriction on the ratio can avoid situations where a too small ratio results in low utilization of the groove 21 and affects the size of the pole 2, and can also prevent situations where the flow rate after welding does not meet the requirements. It should be noted that the first side wall is located at one end of the second side wall along its length direction, in which case the length of the first side wall is L1, the length of the step 22 is L2, and 0.5≤L2 / L1≤1; or the first side wall is located at the other end of the second side wall along its length direction, in which case the length of the first side wall is L3, the length of the step 22 is L4, and 0.5≤L3 / L4≤1.

[0078] In a specific implementation, the groove 21 includes two opposing first sidewalls, and the ratio of the length of the step 22 on each first sidewall to the length of the corresponding first sidewall is in the range of 0.35 to 1. The ratio of the length of the step 22 on each first sidewall to the length of the corresponding first sidewall can be any one of 0.35, 0.4, 0.5, 0.5, 0.6, 0.7, 0.8, 0.9, and 1. Limiting this ratio can prevent a situation where the utilization rate of the groove 21 is too small and the size of the pole 2 is affected. It can also prevent the flow rate from not meeting the requirements after welding. In this case, the two first sidewalls are located at the two ends of the second sidewall along the length direction. In this case, 0.35≤L2 / L1≤1 and 0.35≤L3 / L4≤1.

[0079] In a specific implementation, a chamfer is provided at the connection position between the end face of the pole 2 close to the pole group 11 and the second side wall of the groove 21; and / or a chamfer is provided at the connection position between the end face of the connector 3 facing away from the pole group 11 and the side face of the connector 3 close to the second side wall. It should be noted that the chamfer facilitates the assembly of the pole 2 and the connector 3 and can avoid cutting the pole ear.

[0080] When implementing it specifically, Figure 3As shown, the pole group 11 is provided with multiple, and the minimum spacing between the free ends of two adjacent pole ears is 0.5mm≤M≤20mm. It should be noted that M can be any one of 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 1mm, 12mm, 13mm, 14mm, 15mm, 16mm, 17mm, 18mm, 19mm, and 20mm. The numerical limit can avoid the situation where the pole ears of multiple pole groups 11 overlap, bulge, and cannot be assembled due to being too small, and can also avoid the situation where it is too large, resulting in low utilization rate of connectors and increased cost.

[0081] In specific implementation, the steps 22 on the first side wall can be discontinuous or continuous along the length direction of the first side wall. Figure 7 As shown, the step 22 on the first side wall is discontinuous and divided into three sections, whose lengths are L5, L6, and L7, respectively, and 0.2≤(L5+L6+L7) / L1≤0.95, which can avoid the situation where the step is too small, resulting in insufficient overlap size or the welding connection cannot meet the overcurrent requirements.

[0082] The basic principles of the present application have been described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, and effects mentioned in this application are merely illustrative and not restrictive, and it should not be assumed that these advantages, strengths, and effects are required of each embodiment of this application. In addition, the specific details disclosed above are merely illustrative and facilitating understanding, and are not restrictive. The above details do not limit this application to necessarily being implemented using the above specific details.

[0083] The block diagrams of the devices, devices, equipment, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, devices, equipment, and systems can be connected, arranged, or configured in any manner. Words such as "include," "comprise," "have," and the like are open-ended words, meaning "including but not limited to," and can be used interchangeably therewith. The words "or" and "and" used herein refer to the words "and / or" and can be used interchangeably therewith, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to," and can be used interchangeably therewith.

[0084] It should also be noted that in the apparatus, device, and method of the present application, each component or each step can be decomposed and / or recombined, and such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0085] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0086] It should be understood that the qualifiers "first", "second", "third", "fourth", "fifth" and "sixth" used in the description of the embodiments of the present application are only used to more clearly illustrate the technical solutions and cannot be used to limit the scope of protection of the present application.

[0087] The above description has been provided for the purpose of illustration and description. Furthermore, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although a number of example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery, characterized in that: include: Pole group; a pole lug, one end of which is electrically connected to the pole group; A pole, wherein an end surface of the pole column close to one end of the pole group is provided with a groove, and a first side wall of the groove close to one end of the pole group is concave to form a step; A connecting piece is located in the groove and is positioned and matched with the step, and the step and the connecting piece are fixed by penetration welding to form a weld; In which, there is a first gap between the bottom surface of the groove and the connecting member, the first gap is used to accommodate the pole ear, and there is a second gap between the outer periphery of the connecting member and the second side wall of the groove, the second gap is used to pass the pole ear; the thickness of the connecting member is T; in the direction perpendicular to the first side wall, the size of the step is W, where 1.5≤W / T≤5.

2. The battery according to claim 1, characterized in that The ratio of the length of all the steps to the sum of the circumferential dimensions of all the side walls of the groove is in the range of 0.3 to 1.

3. The battery according to claim 1, characterized in that The penetration depth A of the weld on the pole is ≥0.15 mm.

4. The battery according to claim 1, characterized in that The minimum distance A1 between the side of the weld facing away from the pole axis and the end of the pole group and the edge of the connector is ≥0.2 mm; Alternatively, along a direction parallel to the first side wall and perpendicular to the thickness of the connecting member, the size of the weld is greater than or equal to 1 mm, and the difference between the size of the step and the size of the weld is greater than or equal to 1 mm.

5. The battery according to claim 1, characterized in that The number of the electrode groups is at least three; the electrode tabs include a first electrode tab and a second electrode tab, and the second gap is used to pass through the first electrode tab; The connecting member is provided with a strip-shaped through hole, the extension direction of the strip-shaped through hole is parallel to the second side wall and perpendicular to the thickness direction of the connecting member, the strip-shaped through hole is used to pass through the second pole tab, and the ratio of the width of the strip-shaped through hole to the thickness of the second pole tab is in the range of 5 to 60.

6. The battery according to claim 5, characterized in that The minimum distance between the inner wall of the strip-shaped through hole and the outer periphery of the connecting piece is greater than or equal to 1 mm and less than or equal to 5 mm.

7. The battery according to claim 1, characterized in that The electrode group is provided with 2n or 2n-1 electrodes, and n connecting members are sequentially provided in a direction perpendicular to the second side wall, where n is a positive integer greater than 1; the electrode tabs include a first electrode tab and a second electrode tab, and the second gap is used for passing the first electrode tab; A third gap is formed between two adjacent connecting members, and the third gap is used for passing the second electrode tab. The ratio of the width of the third gap to the thickness of the second electrode tab is in the range of 2 to 60.

8. The battery according to claim 1, characterized in that There is one pole group, and one second gap is provided for passing the pole lug of the pole group; Wherein, the groove includes a first side wall, and the ratio of the length of the step on the first side wall to the length of the first side wall is in a range of 0.5 to 1; Alternatively, the groove includes at least two first side walls, and the ratio of the length of the step on each first side wall to the length of the corresponding first side wall is in the range of 0.35 to 1.

9. The battery according to claim 1, characterized in that There are 2m pole groups, and two second gaps are provided in a direction perpendicular to the second side wall; the first side wall and the second side wall are perpendicular to each other; m is a positive integer; Wherein, the groove includes a first side wall, and the ratio of the length of the step on the first side wall to the length of the first side wall is in a range of 0.5 to 1; Alternatively, the groove includes two oppositely disposed first side walls, and the ratio of the length of the step on each first side wall to the length of its corresponding first side wall is in the range of 0.35 to 1.

10. The battery according to claim 1, characterized in that A chamfer is provided at a connection position between an end face of the pole column close to the pole group and the second side wall of the groove; and / or a chamfer is provided at a connection position between an end face of the connector facing away from the pole group and a side face of the connector close to the second side wall; Alternatively, the electrode group is provided with a plurality of electrode tabs, and the minimum distance between the free ends of two adjacent electrode tabs is 0.5 mm ≤ M ≤ 20 mm.

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