Batteries and battery packs

Abstract

This invention relates to the field of battery technology, and in particular to a battery and a battery pack. The battery includes: a casing with mounting holes; an electrode assembly fitted into the mounting holes; the electrode assembly including an electrode body, a first insulating member, and a connector; one end of the electrode body facing the inside of the battery extending into the mounting holes; the first insulating member surrounding a circumferential sidewall of the end of the electrode body facing the outside of the battery; the connector surrounding a circumferential sidewall of the first insulating member; axially, the end of the connector facing the inside of the battery forms a first connecting portion extending radially along the battery and capable of conforming to the surface of the casing, the first connecting portion being welded to the casing to form a welded portion; a sealing member is sandwiched between the side of the casing facing the outside of the battery and the electrode body. This invention can reduce the axial space occupied by the electrode body within the casing, and the impact of welding on the first insulating member, making battery assembly simpler and improving battery assembly efficiency.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery and battery pack. Background Technology

[0002] Cylindrical batteries are widely used due to their mature manufacturing process and good rate performance. A battery consists of an electrode assembly, a cover plate, and a casing. The positive and negative tabs on the electrode assembly are located on opposite sides of its axial direction and are connected to different current collectors. One current collector is connected to a terminal on the cover plate or casing. A plastic seal is provided between the terminal and the cover plate / casing.

[0003] In existing technologies, the terminals extend from inside the casing to achieve assembly between the terminals and the casing. This results in a large axial dimension of the terminals and a large volume within the casing. Consequently, the terminals occupy a significant amount of axial space inside the battery, affecting the battery's energy density. Furthermore, the heat generated during terminal welding can easily cause the upper plastic to melt. In addition, existing cylindrical batteries are complex to assemble, affecting assembly efficiency. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a battery and battery pack to solve the problems of existing batteries where the terminals occupy a large axial space inside the battery, affecting the energy density of the battery, the heat generated during terminal welding easily affecting the insulation performance of the plastic, and the complex assembly affecting battery production efficiency.

[0005] A first aspect of the present invention provides a battery, wherein the battery comprises:

[0006] The outer casing has mounting holes;

[0007] A terminal assembly is fitted into the mounting hole; the terminal assembly includes a terminal body, a first insulating member, and a connector; one end of the terminal body facing the inside of the battery extends into the mounting hole; the first insulating member surrounds the circumferential sidewall of the end of the terminal body facing the outside of the battery; the connector surrounds the circumferential sidewall of the first insulating member; in the axial direction of the battery, the end of the connector facing the inside of the battery forms a first connecting portion that extends radially along the battery and can fit against the surface of the outer casing, and the first connecting portion is welded to the outer casing to form a welded portion;

[0008] A seal is sandwiched between the outer casing facing the outside of the battery and the terminal body.

[0009] Preferably, the circumferential side wall of the pole post body is formed with a boss protruding radially outward of the battery, the sealing member is press-fitted with the boss in the axial direction of the battery; one end of the connecting member facing the outside of the battery is formed with a second connecting part extending in the radial direction of the battery; part of the first insulating member is arranged on the side of the boss facing the outside of the battery, and a recess is formed for the second connecting part to extend into.

[0010] Preferably, the side of the shell facing the outside of the battery is provided with a first groove and a first protrusion, the first protrusion is formed in an annular structure, the first groove is arranged in the radially inner region surrounded by the first protrusion, the mounting hole is arranged on the bottom wall of the first groove, and the first connecting part is welded to the side of the bottom wall of the first groove facing the outside of the battery; in the axial direction of the battery, the groove depth of the first groove is A, in mm.

[0011] Preferably, in the axial direction of the battery, the thickness of the first connecting part is t, in mm; 10%≤t / A≤1;

[0012] And / or, in the axial direction of the battery, the distance between the side of the first insulating member facing the inside of the battery and the bottom wall of the first groove is h, 0mm≤h≤0.5mm.

[0013] Preferably, the surface of the first protrusion facing the outside of the battery is formed into a first mounting part welded to the busbar, the first mounting part is formed into an annular plane, and the ring width of the first mounting part in the radial direction of the battery is P, 3mm≤P≤15mm.

[0014] Preferably, the first connecting part is fillet-welded to the shell; in the radial direction of the battery, the distance between the side wall of the first groove and the circumferential edge of the first connecting part is B, in mm, 1.5×A≤B≤10×A.

[0015] Preferably, the first connecting part is penetration-welded to the shell, the fusion width of the welding part in the radial direction of the battery is C, in mm; the size of the first connecting part in the radial direction of the battery is L, 4×C≤L≤15×C.

[0016] Preferably, further comprising:

[0017] a pole group arranged in the inside of the shell;

[0018] a first current collector plate arranged on the side of the pole group close to the pole post assembly, the pole post body is provided with a second groove on the side facing the inside of the battery, and the side of the first current collector plate facing the outside of the battery is formed with a second protrusion extending into the second groove;

[0019] A second current collecting disc is arranged on the side of the pole group away from the pole post assembly in the axial direction of the battery.

[0020] A second insulation member is arranged on the side of the first current collecting disc facing the outside of the battery, and a communication hole for the second protrusion to pass through is formed in the second insulation member, and the second insulation member is crimped with the sealing member.

[0021] Preferably, the pole post body is welded with the second protrusion; a third groove is arranged on the side of the pole post body facing the outside of the battery in the axial direction of the battery, and a fourth groove corresponding to the second protrusion is formed on the side of the first current collecting disc facing the inside of the battery; the width of the groove bottom of the third groove in the radial direction of the battery is D1, in mm; the width of the part of the second protrusion in contact with the groove bottom of the second groove in the radial direction of the battery is D2, in mm, and 0.4mm≤D2-D1≤5mm.

[0022] The surface of the pole post body facing the outside of the battery is formed as a second mounting portion welded with the busbar, and the second mounting portion is formed as an annular plane, and the ring width of the second mounting portion in the radial direction of the battery is Q, and 3mm≤Q≤15mm.

[0023] The second aspect of the present application provides a battery pack comprising the battery of any one of the above technical solutions.

[0024] Compared with the prior art, the present application has the following beneficial effects:

[0025] The battery of the present application comprises a shell provided with a mounting hole, and a pole post assembly assembled in the mounting hole; the pole post assembly comprises a pole post body, a first insulation member and a connecting member; one end of the pole post body facing the inside of the battery extends into the mounting hole; the first insulation member surrounds the circumferential sidewall of the one end of the pole post body facing the outside of the battery; the connecting member surrounds the circumferential sidewall of the first insulation member; in the axial direction of the battery, one end of the connecting member facing the inside of the battery is formed with a first connecting portion extending in the radial direction of the battery and capable of abutting the surface of the shell; the first connecting portion is welded with the shell to form a welding portion; and the sealing member is clamped between the side of the shell facing the outside of the battery and the pole post body, so that the pole post assembly can be directly welded on the shell from the outside of the shell via the connecting member as a whole, thereby reducing the size of the pole post body in the axial direction of the battery and the size of the axial space occupied by the pole post body in the shell, increasing the space utilization rate of the battery, and helping to improve the energy density of the battery. In addition, the pole post assembly is welded on the shell via the connecting member, reducing the influence of welding on the first insulation member, ensuring the insulation performance of the first insulation member, and also making the battery assembly simpler and improving the assembly efficiency of the battery, and further improving the assembly efficiency of the battery pack.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the battery structure provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram of the exploded structure of a battery provided in an embodiment of the present invention from another perspective;

[0031] Figure 4 This is a cross-sectional view of the battery structure before welding, provided in an embodiment of the present invention.

[0032] Figure 5 for Figure 4 Enlarged structural diagram at point E;

[0033] Figure 6 This is a schematic diagram of a battery structure in which the connector and the outer casing are connected by fillet welding, according to an embodiment of the present invention.

[0034] Figure 7 for Figure 6 Enlarged structural diagram at point F;

[0035] Figure 8 This is a schematic diagram of a battery structure in which the connector and the outer casing are connected by through-welding, according to an embodiment of the present invention.

[0036] Figure 9 for Figure 8 A magnified structural diagram of point G in the middle.

[0037] Icons: 10-Outer shell; 11-Housing shell; 12-Cover plate; 13-Mounting hole; 14-First groove; 15-First protrusion; 151-First mounting part; 20-Pole group; 30-Pole post assembly; 31-Pole post body; 311-Boss; 312-Second groove; 313-Third groove; 3131-Second mounting part; 32-First insulating element; 321-Recess; 33-Connector; 331-First connecting part; 3311-Welding part; 332-Second connecting part; 40-Sealing element; 50-First collector plate; 51-Second protrusion; 52-Fourth groove; 60-Second collector plate; 70-Second insulating element. Detailed Implementation

[0038] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0039] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0040] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0041] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0042] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0043] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0044] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0045] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0046] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0047] According to a first aspect of the present invention, a battery is provided, comprising a housing 10, an electrode assembly 30, and a seal 40.

[0048] The specific structure of the battery according to this embodiment will be described below.

[0049] In this embodiment, as Figures 1 to 4 As shown, the outer casing 10 has a mounting hole 13, which is a through hole penetrating the outer casing 10 to achieve communication between the inside and outside of the outer casing 10. The outer casing 10 includes a cover plate 12 and a housing 11. The housing 11 has a cavity inside to accommodate the electrode assembly 20. The housing 11 is cylindrical. The cover plate 12 is formed as a circular plate or sheet structure. The cover plate 12 is welded and assembled with the housing 11 to encapsulate the electrode assembly 20. In a first optional embodiment, as shown... Figures 1 to 9 As shown, the mounting hole 13 is formed on the housing 11, specifically on the bottom wall of the housing 11 opposite to the cover plate 12. In a second alternative embodiment, the mounting hole 13 is formed on the cover plate 12.

[0050] In this embodiment, the terminal assembly 30 is fitted into the mounting hole 13. Specifically, the terminal assembly 30 includes a terminal body 31, a first insulating member 32, and a connector 33. The terminal body 31 and the connector 33 are metal parts, and the first insulating member 32 is a plastic part with insulating properties, such as PP or PPS. The terminal body 31 extends into the mounting hole 13 at one end facing the inside of the battery axially, and the other end extends out of the outer casing 10. The first insulating member 32 is formed into a ring structure, so that it can surround the circumferential sidewall of the end of the terminal body 31 facing the outside of the battery, so that the first insulating member 32 can be fitted into the mounting hole 13. An insulating member 32 is disposed at the end of the mounting hole 13 facing the outside of the battery, and does not extend into the mounting hole 13; the connector 33 is also formed into an annular structure, which surrounds the circumferential sidewall of the first insulating member 32, so that the first insulating member 32 separates the connector 33 and the terminal body 31; in the axial direction of the battery, the end of the connector 33 facing the inside of the battery is formed with a first connecting portion 331 that extends radially along the battery and can fit against the surface of the outer casing 10. The first connecting portion 331 is welded to the outer casing 10 to form a welded portion 3311, thereby realizing the assembly of the terminal assembly 30 and the outer casing 10.

[0051] More specifically, the sealing element 40 is sandwiched between the side of the outer casing 10 facing the outside of the battery and the terminal body 31 to ensure the sealing of the terminal assembly 30 with the outer casing 10. This allows the terminal assembly 30 to be welded directly to the outer casing 10 as a whole from the outside via the connector 33, eliminating the need to assemble the terminal assembly 30 from the inside of the outer casing 10. This reduces the axial dimension of the terminal body 31 in the battery and the axial space occupied by the terminal body 31 within the outer casing 10, increasing the internal space utilization of the battery and helping to improve the energy density of the battery. In addition, the terminal assembly 30 is welded to the outer casing 10 via the first connecting part 331, reducing the impact of welding on the first insulator 32, ensuring the insulation performance of the first insulator 32, and also making battery assembly simpler and improving battery assembly efficiency.

[0052] In this embodiment, the seal 40 can be an elastic sealing ring. The seal 40 covers the circumferential sidewall of the end of the terminal body 31 facing the inside of the battery, and the portion of the seal 40 in the axial direction of the battery is sandwiched between the side of the outer casing 10 facing the outside of the battery and the terminal body 31. Specifically, a portion of the seal 40 is sandwiched between the side of the outer casing 10 facing the outside of the battery and the boss 311 described below.

[0053] It should be noted that the battery axis is... Figure 4 The vertical direction from the perspective of the battery is the radial direction. Figure 4 The horizontal direction from the perspective of view.

[0054] Furthermore, in this embodiment, as Figures 1 to 9 As shown, the circumferential sidewall of the electrode body 31 has a boss 311 that protrudes outward along the radial direction of the battery. The boss 311 forms an annular structure and the seal 40 is pressed against the boss 311 in the axial direction of the battery, so that the seal 40 generates a compression amount.

[0055] The connector 33 has a second connecting portion 332 extending radially along the battery at one end facing the outside of the battery. The first connecting portion 331 and the second connecting portion 332 extend in opposite directions in the radial direction of the battery. The second connecting portion 332 is formed as an annular structure that is parallel to the first connecting portion 331 and spaced apart in the axial direction of the battery. A portion of the first insulating member 32 is provided on the side of the boss 311 facing the outside of the battery and has a recess 321 for the second connecting portion 332 to extend into. The recess 321 is formed as an annular groove provided on the circumferential sidewall of the first insulating member 32, so that the projection of the second connecting portion 332 in the axial direction of the battery covers at least a portion of the boss 311, thereby realizing the assembly and fixation of the terminal assembly 30.

[0056] In this embodiment, as Figures 1 to 9 As shown, a first groove 14 and a first protrusion 15 are provided on the side of the outer casing 10 facing the outside of the battery. The first protrusion 15 is formed into an annular structure. The first groove 14 is located in the radially inner area surrounded by the first protrusion 15. The first groove 14 and the first protrusion 15 can be formed simultaneously by stamping. The mounting hole 13 is opened on the bottom wall of the first groove 14. Preferably, the axis of the first protrusion 15 is collinear with the axis of the mounting hole 13.

[0057] The first connecting part 331 is welded to the bottom wall of the first groove 14 facing the outside of the battery; such as Figure 5 As shown, along the battery axis, the groove depth of the first groove 14 is A, in mm. The end of the electrode body 31 facing the outside of the battery extends out of the first groove 14, such that the surface of the electrode body 31 facing the outside of the battery is higher than the surface of the first protrusion 15 facing the outside of the battery, that is, the second mounting part 3131 described below is higher than the first mounting part 151 described below.

[0058] Furthermore, in this embodiment, the thickness of the first connecting part 331 along the battery axis is t, that is, the thickness of the first connecting member 33 is t, in mm; 10%≤t / A≤1, thus avoiding the impact of excessively large t / A parameters on the external space utilization of the battery, and also avoiding the impact of excessively small t / A parameters on the internal space utilization of the battery, which would also lead to an increase in the weight of the first connecting member 33 and increase costs.

[0059] The reliability of the 10%≤t / A≤1 constraint in this application was verified through multiple sets of battery assembly tests. In each set of embodiments or comparative examples, multiple batteries with the same t and A dimensions were assembled. The test results are shown in Table 1.

[0060] Table 1

[0061]

[0062] In this embodiment, as Figure 5 As shown, in the axial direction of the battery, the distance between the side of the first insulating member 32 facing the inside of the battery and the bottom wall of the first groove 14 is h, 0mm≤h≤0.5mm, which improves the insulation performance between the electrode body 31 and the outer shell 10, avoids the parameter h being too small, which would cause the first insulating member 32 and the outer shell 10 to interfere with each other during assembly, making it impossible to assemble the electrode body 31, and also avoids the parameter h being too large, which would increase the risk of insulation failure between the electrode body 31 and the outer shell 10.

[0063] like Figure 5 As shown, the surface of the first protrusion 15 facing the outside of the battery is formed as a first mounting portion 151 to be welded to the busbar. The first mounting portion 151 is formed as an annular plane. The annular width of the first mounting portion 151 in the radial direction of the battery, that is, the width of the inner and outer rings of the annular first mounting portion 151 in the radial direction of the battery, is P, 3mm≤P≤15mm. This satisfies the welding requirements between the outer casing 10 and the busbar, avoiding the possibility that the size of P is too small and therefore cannot be welded, and also avoiding the possibility that the size of P is too large and therefore increases the cost and weight.

[0064] In alternative implementations, such as Figure 6 and Figure 7 As shown, the first connecting part 331 is corner-welded to the outer casing 10, such that the welded part 3311 is located at the circumferential edge of the first connecting part 331; as Figure 6 As shown, in the radial direction of the battery, the distance between the sidewall of the first groove 14 and the circumferential edge of the first connecting part 331 is B, in mm, 1.5×A≤B≤10×A. This avoids the first connecting part 331 and the outer shell 10 from being unable to be welded due to the size of B being too small, and also avoids the size of the pole body 31 from being affected by the size of B being too large.

[0065] In another alternative implementation, such as Figure 8 and Figure 9 As shown, the first connecting part 331 is welded to the outer casing 10 through the weld, as... Figure 9 As shown, the weld width of the welding part 3311 in the radial direction of the battery is C, in mm; the dimension of the first connecting part 331 in the radial direction of the battery is L, in mm, 4×C≤L≤15×C, so as to avoid the welding difficulty and the melting of the first insulating part 32 due to the size of L being too small; it also avoids the design of the outer shell 10 and the electrode body 31 being affected by the size of L being too large, thus increasing the cost.

[0066] The reliability of the 4×C≤L≤15×C constraint in this application was verified through multiple sets of battery assembly tests. In each set of embodiments or comparative examples, multiple batteries with the same L and C dimensions were assembled. The test results are shown in Table 2.

[0067] Table 2

[0068]

[0069] In this embodiment, the welding portion 3311 is formed as an annular structure surrounding the outside of the first insulating member 32, and is spaced apart from the first insulating member 32 in the radial direction of the battery.

[0070] Furthermore, in this embodiment, such as Figures 1 to 9 As shown, the battery also includes an electrode assembly 20, a first current collector 50, a second current collector 60, and a second insulating component 70. The electrode assembly 20 is disposed inside the housing 10, and the positive and negative tabs on the electrode assembly 20 are respectively disposed on both sides of the battery axis. The first current collector 50 is disposed on the side of the electrode assembly 20 closer to the terminal post assembly 30 in the battery axis, and the second current collector 60 is disposed on the side of the electrode assembly 20 away from the terminal post assembly 30 in the battery axis.

[0071] Furthermore, such as Figure 2 , Figure 3 and Figure 7 As shown, a second groove 312 is provided on the side of the terminal body 31 facing the inside of the battery, and a second protrusion 51 extending into the second groove 312 is formed on the side of the first current collector 50 facing the outside of the battery. The second protrusion 51 is located in the middle of the first current collector 50, and the first current collector 50 is welded to the terminal body 31 through the second protrusion 51. A second insulating member 70 is provided on the side of the first current collector 50 facing the outside of the battery to insulate and separate the first current collector 50 from the outer casing 10. A connecting hole is provided on the second insulating member 70 for the second protrusion 51 to pass through, so that the second protrusion 51 extends into the second groove 312 through the connecting hole.

[0072] Preferably, such as Figure 5As shown, the second insulating component 70 is pressed together with the sealing component 40, thus ensuring the insulation and sealing performance of the battery after assembly.

[0073] Furthermore, in this embodiment, a third groove 313 is provided on the side of the electrode body 31 facing the outside of the battery along the battery axis. The third groove 313 and the second groove 312 are arranged opposite to each other on both sides of the electrode body 31 to reduce the thickness of the electrode body 31 along the battery axis. A fourth groove 52 is formed on the side of the first current collector 50 facing the inside of the battery, corresponding to the second protrusion 51. That is, the second protrusion 51 and the fourth groove 52 are arranged opposite to each other on the front and back sides of the first current collector 50 along the battery axis. Figure 9 As shown, the width of the bottom of the third groove 313 in the radial direction of the battery is D1, in mm; the width of the part of the second protrusion 51 that contacts the bottom of the second groove 312 in the radial direction of the battery is D2, in mm. 0.4mm≤D2-D1≤5mm, thus avoiding excessive defects such as poor welding and explosion points due to the size of D2-D1 being too small, and also avoiding affecting the overall structure of the electrode post body 31 due to the size of D2-D1 being too large.

[0074] Furthermore, in this embodiment, as Figure 5 As shown, the surface of the electrode body 31 facing the outside of the battery is formed as a second mounting part 3131 to be welded to the busbar. The second mounting part 3131 is formed as an annular plane. The annular width of the second mounting part 3131 in the radial direction of the battery is Q. That is, the width between the inner ring and the outer ring of the annular second mounting part 3131 in the radial direction of the battery is Q. 3mm≤Q≤15mm, so as to meet the welding requirements of the outer shell 10 and the busbar, avoid the size of Q being too small, which would make welding impossible and the heat generated by welding would easily cause the first insulating component 32 to melt and affect the insulation performance of the first insulating component 32. Also, avoid the size of Q being too large, which would increase the cost and weight.

[0075] It should be noted that, in this embodiment, the battery assembly process is as follows:

[0076] The first set of procedures is as follows: the first current collector 50 and the second insulating component 70 are sequentially assembled onto the electrode group 20, then the electrode group 20 is installed into the housing 11, the second current collector 60 is welded to the electrode group 20, and finally the cover plate 12 is assembled with the housing 11.

[0077] The second set of processes is as follows: the pole body 31, the first insulating component 32 and the connector 33 are assembled to form the pole assembly 30, and then the sealing component 40 is assembled with the pole assembly 30.

[0078] The order of installation of the first and second sets of processes can be interchanged without specific restrictions, or the two production lines can be carried out simultaneously.

[0079] After the first and second sets of processes are completed, the connector 33 is welded onto the outer shell 10, and then the pole body 31 is welded to the first collector plate 50.

[0080] A battery according to the present invention includes a housing with mounting holes, and an electrode assembly is assembled into the mounting holes. The electrode assembly includes an electrode body, a first insulating member, and a connector. One end of the electrode body facing the inside of the battery extends into the mounting hole. The first insulating member surrounds the circumferential sidewall of the end of the electrode body facing the outside of the battery. The connector surrounds the circumferential sidewall of the first insulating member. In the axial direction of the battery, the end of the connector facing the inside of the battery forms a first connecting portion that extends radially along the battery and can fit against the surface of the housing. The first connecting portion is welded to the housing to form a welded portion. A sealing member is sandwiched between the side of the housing facing the outside of the battery and the electrode body. In this way, the electrode assembly can be welded directly to the housing from the outside of the housing as a whole via the connector, thereby reducing the axial dimension of the electrode body in the battery and the axial space occupied by the electrode body in the housing, increasing the space utilization rate inside the battery, and helping to improve the energy density of the battery. In addition, the terminal assembly is welded to the outer casing through connectors, which reduces the impact of welding on the first insulating component, ensures the insulation performance of the first insulating component, simplifies battery assembly, improves battery assembly efficiency, and further improves the assembly efficiency of the battery pack.

[0081] The battery pack provided by the present invention includes the battery as described above, and thus has all the above-mentioned beneficial effects, which will not be repeated here.

[0082] Finally, it should be noted that the above-described embodiments are merely specific implementations of this application, used to illustrate the technical solutions of this application, and not to limit them. The protection scope of this application is not limited thereto. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any person skilled in the art can still modify or easily conceive of changes to the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features, within the technical scope disclosed in this application. Such modifications, changes, or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be covered within the protection scope of this application. Therefore, the protection scope of this application should be determined by the protection scope of the claims.

Claims

1. A battery, characterized by, The battery comprises: a shell with a mounting hole; a pole post assembly assembled in the mounting hole; the pole post assembly comprises a pole post body, a first insulating piece and a connecting piece; one end of the pole post body facing the inside of the battery extends into the mounting hole; the first insulating piece is arranged on the circumferential sidewall of the end of the pole post body facing the outside of the battery; the connecting piece is arranged on the circumferential sidewall of the first insulating piece; in the axial direction of the battery, one end of the connecting piece facing the inside of the battery is provided with a first connecting part extending in the radial direction of the battery and capable of being attached to the surface of the shell, and the first connecting part is welded to the shell to form a welding part; a sealing piece clamped between the side of the shell facing the outside of the battery and the pole post body; a pole group arranged in the inside of the shell; a first current collector arranged on the side of the pole group close to the pole post assembly in the axial direction of the battery; the side of the pole post body facing the inside of the battery is provided with a second groove; the side of the first current collector facing the outside of the battery is provided with a second protrusion extending into the second groove; a second current collector arranged on the side of the pole group away from the pole post assembly in the axial direction of the battery; a second insulating piece arranged on the side of the first current collector facing the outside of the battery; the second insulating piece is provided with a communication hole for the second protrusion to pass through; and the second insulating piece is pressure-welded to the sealing piece; the pole post body is welded to the second protrusion; in the axial direction of the battery, the side of the pole post body facing the outside of the battery is provided with a third groove; the side of the first current collector facing the inside of the battery is provided with a fourth groove corresponding to the second protrusion; the width of the bottom of the third groove in the radial direction of the battery is D1, in mm; the width of the part of the second protrusion in contact with the bottom of the second groove in the radial direction of the battery is D2, in mm, and 0.4mm≤D2-D1≤5mm; the side of the shell facing the outside of the battery is provided with a first groove and a first protrusion; the first protrusion is formed in an annular structure; the first groove is arranged in the radial inside area surrounded by the first protrusion; the mounting hole is arranged in the bottom wall of the first groove; and the first connecting part is welded to the side of the bottom wall of the first groove facing the outside of the battery; in the axial direction of the battery, the groove depth of the first groove is A, in mm; the thickness of the first connecting part is t, in mm; and 10%≤t / A≤1; the first connecting part is fillet-welded to the shell; in the radial direction of the battery, the distance between the sidewall of the first groove and the circumferential edge of the first connecting part is B, in mm, and 1.5×A≤B≤10×A; or the first connecting part is penetration-welded to the shell; the fusion width of the welding part in the radial direction of the battery is C, in mm; and the size of the first connecting part in the radial direction of the battery is L, and 4×C≤L≤15×C.

2. The battery of claim 1, wherein, The circumferential side wall of the pole body is formed with a boss protruding radially outward of the battery, the sealing member is press-bonded with the boss in the axial direction of the battery; one end of the connecting member facing the outside of the battery is formed with a second connecting part extending in the radial direction of the battery; part of the first insulating member is arranged on the side of the boss facing the outside of the battery, and is provided with a recess for the second connecting part to extend into.

3. The battery of claim 1, wherein, In the axial direction of the battery, the distance between the side of the first insulating member facing the inside of the battery and the bottom wall of the first groove is h, 0mm≤h≤0.5mm.

4. The battery of claim 1, wherein, The surface of the first protrusion facing the outside of the battery is formed into a first mounting part for welding with the bus bar, the first mounting part is formed into an annular plane, the ring width of the first mounting part in the radial direction of the battery is P, 3mm≤P≤15mm.

5. The battery of claim 1, wherein, The surface of the pole body facing the outside of the battery is formed into a second mounting part for welding with the bus bar, the second mounting part is formed into an annular plane, the ring width of the second mounting part in the radial direction of the battery is Q, 3mm≤Q≤15mm.

6. A battery pack, characterized by, The battery comprising any one of claims 1 to 5.

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