Battery, battery pack, electric device, and method for manufacturing battery

Abstract

The present application relates to the field of battery, especially to a battery, a battery pack, an electric device and a manufacturing method of the battery. The battery comprises: a switching component, comprising a first switching part for electrically connecting with an electrode assembly and a second switching part for electrically connecting with an electrode terminal, the first switching part is in a folded state relative to the second switching part along a crease; wherein the crease is located between a first end face and a second end face of the first switching part; when the switching component is in an unfolded state, the second end face and the first end face are arranged along the length direction. Based on this, it is beneficial to reduce the shielding of the switching component to the end face of the electrode assembly and improve the infiltration efficiency.

Description

[0001] This application is a divisional application of patent application No. 202010274181.2, filed on April 9, 2020, entitled "Battery, Battery Pack, Electrical Device and Method of Manufacturing Battery". Technical Field

[0002] This invention relates to the field of batteries, and particularly to a battery, a battery pack, an electrical device, and a method for manufacturing a battery. Background Technology

[0003] Due to their advantages such as high energy density, high power density, high number of cycles, and long storage time, cylindrical lithium-ion batteries and other secondary batteries are widely used in electric vehicles (such as electric cars, electric tricycles, or electric bicycles).

[0004] In secondary batteries such as cylindrical lithium-ion batteries, the electrolyte needs to enter between the cell electrodes through the cell end face to achieve the wetting process.

[0005] In related technologies, the wetting efficiency of batteries still needs to be improved. Summary of the Invention

[0006] The present invention aims to provide a battery, a battery pack, an electrical device, and a method for manufacturing a battery, so as to improve the wetting efficiency of the battery.

[0007] The battery provided by this invention includes:

[0008] The adapter includes a first adapter portion for electrical connection with an electrode assembly and a second adapter portion for electrical connection with an electrode terminal, wherein the first adapter portion is folded relative to the second adapter portion along a crease.

[0009] The crease is located between the first end face and the second end face of the first transition part;

[0010] When the adapter is in the unfolded state, the second end face and the first end face are arranged along the length direction.

[0011] In some embodiments, a first notch is provided on the side of the first adapter near the second adapter, and a crease extends to the first notch.

[0012] In some embodiments, when the adapter is in the unfolded state, the first notch extends along the length direction or in a direction intersecting the length direction.

[0013] In some embodiments, the second end face is away from the second adapter relative to the first end face, and the first notch is inclined toward the middle of the width direction of the adapter along the direction from the first end face to the second end face.

[0014] In some embodiments, the first notch includes an arc-shaped notch portion, the outline of which is arc-shaped.

[0015] In some embodiments, the first adapter includes a protrusion that protrudes beyond the second adapter along the width direction of the adapter component.

[0016] In some embodiments, the first adapter includes a connecting portion for connecting to the electrode assembly. When the adapter is in the unfolded state, the connecting portion protrudes from the crease along the direction from the first adapter to the second adapter.

[0017] In some embodiments, the projection of the adapter component along the axial direction of the injection hole does not overlap with the projection of the injection hole, which is used to inject electrolyte.

[0018] In some embodiments, along the axial direction of the injection hole, the projection of the adapter does not overlap with the projection of the plug, and the plug extends into the injection hole and exits from the side of the injection hole closest to the electrode assembly.

[0019] In some embodiments, the battery further includes a protective element to prevent the plug from contacting the adapter.

[0020] In some embodiments, the battery further includes a first insulating member located on the side of the battery end cap near the electrode assembly. The first insulating member includes an insulating body and a limiting ring. The limiting ring protrudes relative to the insulating body in a direction near the electrode assembly and is disposed on the periphery of the adapter to prevent the adapter from contacting the battery casing.

[0021] In some embodiments, a limiting ring is disposed on the periphery of one end of the electrode assembly near the end cap.

[0022] In some embodiments, the battery includes an end cap, which includes a body portion, a first protrusion and a second protrusion. The first protrusion protrudes from the body portion toward the electrode assembly, and the second protrusion protrudes from the first protrusion toward the electrode assembly. An injection hole passes through the first protrusion and the second protrusion.

[0023] The battery pack provided by this invention includes the battery of this invention.

[0024] The electrical equipment provided by this invention includes the battery pack of this invention, which is used to provide electrical energy.

[0025] The battery manufacturing method provided by the present invention includes the following steps:

[0026] The first adapter portion is bent between the first end face and the second end face of the first adapter portion relative to the second adapter portion.

[0027] By positioning the crease between the first and second adapter portions between the first and second end faces of the first adapter portion 131 along its length, it is beneficial to reduce the obstruction of the electrode assembly end face by the adapter component and improve the wetting efficiency.

[0028] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 The diagram shows a schematic representation of the electrical device in some embodiments of the present invention.

[0031] Figure 2 Show Figure 1 Exploded view of the battery pack.

[0032] Figure 3 Show Figure 2 A 3D view of the battery.

[0033] Figure 4 Show Figure 3 Exploded view of the battery.

[0034] Figure 5 Show Figure 4 A perspective view of the top cover assembly corresponding to the first tab.

[0035] Figure 6 Show Figure 5 The exploded view of the top cover assembly shown is shown with the adapter in the unfolded state.

[0036] Figure 7 Show Figure 6 Side view of the intermediate connecting component in the unfolded state.

[0037] Figure 8 Show Figure 7 A schematic diagram showing the relative bending of the first, second, and third transition parts of the intermediate connecting component.

[0038] Figure 9 Show Figure 7 A schematic diagram of the intermediate connecting component in a folded state.

[0039] Figure 10 Show Figure 6A top view of the intermediate connecting component in its unfolded state.

[0040] Figure 11 Show Figure 10 A magnified schematic diagram of part I.

[0041] Figure 12 Show Figure 6 A three-dimensional view of the first insulating component.

[0042] Figure 13 Show Figure 6 A 3D view of the middle end cap.

[0043] Figure 14 Show Figure 3 A bottom view of the battery.

[0044] Figure 15 Show Figure 14 A partial schematic diagram of the section cut at point AA.

[0045] Figure 16 Show Figure 15 A magnified schematic diagram of part II.

[0046] Figure 17 Show Figure 14 A partial diagram showing the section cut at point BB.

[0047] Figure 18 Show Figure 14 A partial schematic diagram of the section cut at CC.

[0048] Figure 19 A perspective view of a top cover assembly corresponding to the first tab is shown in some other embodiments of the present invention.

[0049] Figure 20 Show Figure 19 Exploded view of the top cover assembly.

[0050] Figure 21 Show Figure 20 Bottom view of the intermediate connecting component.

[0051] Figure 22 Show Figure 21 The top view of the adapter component in its unfolded state.

[0052] Figure 23 Show Figure 22 A magnified view of part III.

[0053] Figure 24 This invention illustrates a method for manufacturing a battery according to an embodiment of the invention.

[0054] In the picture:

[0055] 100. Electrical equipment; 101. Equipment body; 102. Battery pack; 102a. Box; 102b. Sleeve; 102c. First box cover; 102d. Second box cover;

[0056] 10. Battery;

[0057] 1. End cap assembly;

[0058] 11. End cap; 11a. Electrode lead-out hole; 11b. Liquid injection hole; 11c. Receiving groove; 111. Body part; 112. First boss; 113. Second boss;

[0059] 12. Electrode terminals;

[0060] 13. Adapter component; 131. First adapter portion; 131a. Groove; 131b. Through hole; 131c. Crease; 131d. First notch; 131e. First end face; 131f. Second end face; 131i. Arc-shaped notch portion; 131j. First notch segment; 131h. Protrusion; 13d. Connecting portion; 13e. Third notch; 132. Second adapter portion; 132a. Second notch; 133. Third adapter portion; 133a. First connecting hole;

[0061] 141. Hole plug; 142. Sealing component; 143. Protective component;

[0062] 15. First insulating component; 151. Insulating body; 151a. Second connecting hole; 151b. Mating groove; 151c. Mating hole; 152. Limiting ring; 152a. Protrusion; 153. Support part;

[0063] 16. Second insulating component; 161. Third connecting hole;

[0064] 17. Connecting block; 171. Fourth connecting hole;

[0065] 18. Explosion-proof valve;

[0066] 19. Sealing ring;

[0067] 2. Electrode assembly; 21. Tab; 21a. First tab; 21b. Second tab; 22. Cell body;

[0068] 3. Shell; 31. Cavity. Detailed Implementation

[0069] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0070] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0071] In the description of this invention, it should be understood that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0072] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0073] A battery typically includes a casing, electrode assemblies, electrode terminals, and adapter components. The electrode assemblies are located inside the casing and are electrically connected to the electrode terminals via adapter components. The electrode terminals protrude from the casing and are used for electrical connection to external circuits.

[0074] The electrolyte is injected into the housing and enters between the electrodes of the electrode assembly, where it reacts with the active material on the electrodes to produce a charging and discharging process.

[0075] The process of introducing electrolyte into the electrode assembly is called the wetting process, and the speed at which the electrolyte enters the electrode assembly is called the wetting efficiency.

[0076] In the process of practicing this invention, the inventors discovered that in some cylindrical lithium-ion batteries and other batteries, the adapter is constructed to be flexible. However, in related technologies, the bent adapter obstructs the end face of the electrode assembly more, affecting the wetting efficiency.

[0077] Based on the above findings, the present invention improves the structure of the battery to enhance its wetting efficiency.

[0078] Figure 1-24 The present invention provides an exemplary description of the structure of the electrical device, battery pack, and battery, as well as a method for manufacturing the battery.

[0079] In order to clearly describe each direction in the following sections, we will first use... Figure 2The coordinate system defines each direction. The coordinate axis L represents the first direction, which is the arrangement direction of the first adapter 131 and the second adapter 132 when the adapter 13 is in the unfolded state. In some embodiments, it is also the length direction of the adapter 13 when it is in the unfolded state. The coordinate axis H represents the second direction, which is perpendicular to the first direction L and the third direction W. It is the stacking direction of the first adapter 131 and the second adapter 132 when the adapter 13 is in the folded state. In some embodiments, it is also the height direction of the battery pack 102, the thickness direction of the adapter 13, and the axial direction of the battery 10. The coordinate axis W represents the third direction, which is perpendicular to the first direction L and the second direction H. In some embodiments, it is also the width direction of the adapter 13.

[0080] However, it should be understood that the foregoing directional definitions are only for the convenience of describing the present invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of the present invention.

[0081] Reference Figure 1 The present invention provides an electrical device 100 that uses a battery pack 102 as a power source. The electrical device 100 includes a device body 101 and a battery pack 102. The battery pack 102 is disposed on the device body 101 and is used to provide electrical energy.

[0082] Electrical device 100 is, for example, a mobile device such as a vehicle, ship, or small aircraft. It includes a power source, which comprises a battery pack 102. The battery pack 102 provides electrical energy to drive the electrical device 100. In some embodiments, the driving force of the electrical device 100 is entirely electrical energy, in which case the power source only includes the battery pack 102. In other embodiments, the driving force of the electrical device 100 includes both electrical energy and other energy sources (e.g., mechanical energy), in which case the power source includes the battery pack 102 and other power devices such as an engine. (See also...) Figure 1 Taking a vehicle as an example, in some embodiments, the electrical equipment 100 is a new energy vehicle, such as a pure electric vehicle, a hybrid electric vehicle, a range-extended vehicle, an electric tricycle, or a two-wheeled electric vehicle.

[0083] Alternatively, the electrical equipment 100 can also be an energy storage device such as a battery cabinet, which includes a battery pack 102. The number of battery packs 102 can be one, two or more, so that the battery cabinet can output electrical energy.

[0084] Therefore, any electrical device 100 that includes a battery pack 102 is within the protection scope of this invention.

[0085] Among them, reference Figure 2The battery pack 102 includes a housing 102a and a battery 10, with the battery 10 housed in the housing 102a.

[0086] The housing 102a includes a sleeve 102b, a first cover 102c, and a second cover 102d. The sleeve 102b is, for example, an aluminum shell, hollow inside, with both ends facing each other along the second direction H open. The first cover 102c and the second cover 102d respectively cover the opposing ends of the sleeve 102b along the second direction H, sealing these ends and creating a sealed space inside the housing 102a to house the battery 10, etc. Here, "sealed" refers to covering or closing; it can be either airtight or non-airtight.

[0087] When applied to electrical equipment 10 such as two-wheeled electric vehicles, the first cover 102c is generally on top and the second cover 102d is on the bottom; that is, the first cover 102c is the top cover and the second cover 102d is the bottom cover. During use, the first cover 102c is opened and closed to maintain or replace structural components such as the battery 10 located inside the housing 102a.

[0088] The shape of the housing 102a can be varied, for example, refer to Figure 2 In some embodiments, the housing 102a is generally cubic in shape. The sleeve 102b is a hollow, open-ended cubic shape, comprising four side plates connected end-to-end, which enclose a cavity, with adjacent side plates perpendicular to each other. The height of the sleeve 102b is along a second direction H. The shape of the first cover 102c matches the shape of the opening at the top of the sleeve 102b. The shape of the second cover 102d matches the shape of the opening at the bottom of the sleeve 102b.

[0089] The battery 10 is housed in the casing 102a and is the core structural component of the battery pack 102, used to provide electrical energy. The number of batteries 10 can be one, two, or more. For example, refer to... Figure 2 In some embodiments, the housing 102a contains multiple batteries 10 to provide more electrical energy.

[0090] Reference Figure 2-4 The battery 10 is, for example, a cylindrical battery with its axial direction along the second direction H, and includes a housing 3, an electrode assembly 2, and an end cap assembly 1, etc.

[0091] The housing 3 has an internal cavity 31 for housing the electrode assembly 2, etc. In the cylindrical battery, the housing 3 is constructed in a cylindrical shape.

[0092] The electrode assembly 2 is disposed within the cavity 31 of the housing 3, and is formed, for example, by stacking or winding a first electrode, a second electrode, and an insulating spacer located between the first and second electrodes. One of the first and second electrodes is a positive electrode, and the other is a negative electrode, and both have a first portion coated with active material and a second portion extending outward from the first portion without being coated with active material. Specifically, refer to... Figure 4 The electrode assembly 2 includes a cell body 22 and tabs 21. The cell body 22 is coated with an active material, corresponding to the first portion of the first electrode and the second electrode, and is used to generate electrical energy. The tabs 21 are located at the ends of the cell body 22, extending outwards from the cell body 22, and are not coated with an active material. They correspond to the second portion of the first electrode and the second electrode, and are used to transfer the electrical energy generated by the cell body 22 outwards.

[0093] The electrode 21 generally includes a first electrode 21a and a second electrode 21b, where one of the first electrode 21a and the second electrode 21b is used as a positive electrode, and the other is used as a negative electrode. (See reference...) Figure 4 In some embodiments, the first tab 21a and the second tab 21b are located at opposite ends of the battery body 22 along the second direction H. Furthermore, referring to… Figure 4 In some embodiments, the first tab 21a and the second tab 21b are brought closer to the center of the electrode assembly 2.

[0094] End cap assembly 1 is disposed at the end of housing 3 to close cavity 31, thereby protecting electrode assembly 2 and sealing housing 3. When the first tab 21a and the second tab 21b are respectively located at opposite ends of battery body 22 along the second direction H, battery 10 includes two end cap assemblies 1. These two end cap assemblies 1 respectively cover opposite ends of housing 31 along the second direction H, and correspond to the first tab 21a and the second tab 21b respectively. For example, they are referred to as first end cap assembly and second end cap assembly respectively for easy distinction.

[0095] Reference Figure 3-6 as well as Figures 19-20 In some embodiments, the end cap assembly 1 includes an end cap 11, an electrode terminal 12, and an adapter 13, etc.

[0096] End cap 11 closes the end opening of housing 3. (Refer to...) Figure 4 In some embodiments, the end cap 11 structures of the first end cap assembly and the second end cap assembly are not completely identical. For example, in some embodiments, the end cap 11 of the first end cap assembly is provided with an injection hole 11b for injecting electrolyte, while the end cap 11 of the second end cap assembly is not provided with an injection hole 11b, but is provided with an explosion-proof valve 18. Of course, in other embodiments, the end cap 11 of the second end cap assembly may be provided with an injection hole 11b, while the end cap 11 of the first end cap assembly may be provided with an explosion-proof valve 18.

[0097] Electrode terminals 12 are disposed on end caps 11 and are electrically connected to electrode assembly 2 via adapter 13, thereby enabling electrical connection between electrode assembly 2 and external circuitry. (Refer to...) Figure 6 and Figure 13 In some embodiments, the end cap 11 is provided with electrode lead-out holes 11a, and the electrode terminals 12 extend into the electrode lead-out holes 11a to achieve connection with the end cap 11. Specifically, the end cap 11 is provided with, for example, two electrode lead-out holes 11a, which correspond one-to-one with two electrode terminals 12, that is, the two electrode terminals 12 extend into the two electrode lead-out holes 11a respectively. Furthermore, referring to… Figure 6 and Figure 18 In some embodiments, each electrode lead-out hole 11a is also provided with a sealing ring 19 to achieve a seal between the electrode terminal 12 and the end cap 11.

[0098] The adapter 13 is disposed on the side of the end cap 11 near the electrode assembly 2 and is used to electrically connect the electrode assembly 2 and the electrode terminal 12. When the battery 10 is a cylindrical battery or the like, the adapter 13 is configured to be foldable. In other words, the adapter 13 has an unfolded state and a folded state. When not assembled into a finished battery 10, the adapter 13 is in the unfolded state, and when assembled into a finished battery 10, the adapter 13 is in the folded state.

[0099] For example, refer to Figure 5-11 as well as Figure 21-23 In some embodiments, the adapter 13 includes a first adapter portion 131 and a second adapter portion 132. The first adapter portion 131 is used for electrical connection with the electrode assembly 2 (specifically, the tab 21). The second adapter portion 132 is used for electrical connection with the electrode terminal 12. When the adapter 13 is in the unfolded state, the first adapter portion 131 and the second adapter portion 132 are arranged along a first direction L. Furthermore, the first adapter portion 131 is bendable relative to the second adapter portion 132, forming a crease 131c after bending; that is, the first adapter portion 131 and the second adapter portion 132 are bent relative to each other at the crease 131c. After the first adapter portion 131 is bent relative to the second adapter portion 132 along the crease 131c, the first adapter portion 131 and the second adapter portion 132 are in a folded state. (Refer to...) Figure 15 When in the folded state, the first adapter 131 covers the end face of the electrode assembly 2, while the second adapter 132 is stacked on the side of the first adapter 131 away from the electrode assembly 2.

[0100] Reference Figure 10 and Figure 22 In some embodiments, the adapter 13 is configured as an adapter plate, wherein the first adapter portion 131 is generally disc-shaped and the second adapter portion 132 is generally elongated.

[0101] Continue to refer to Figure 10 and Figure 22 In some embodiments, the first adapter portion 131 protrudes beyond the second adapter portion 132 in the third direction W, that is, the width of the first adapter portion 131 is greater than the width of the second adapter portion 132.

[0102] Specifically, continue to refer to Figure 10 and Figure 23 The first transition portion 131 includes a protrusion 131h that protrudes from the second transition portion 132 along a third direction W. More specifically, the two protrusions 131h are located on opposite sides of the second transition portion 132 along the second direction W. Each protrusion 131h includes a first end face 131e and a second end face 131f that are opposite each other along a first direction L, i.e., the length direction L. Furthermore, the second end face 131f is located away from the second transition portion 132 relative to the first end face 131e.

[0103] Of course, in other embodiments not shown, the first adapter 131 may not protrude from the second adapter 132 in the third direction W, that is, the width of the first adapter 131 is less than or equal to the width of the second adapter 132.

[0104] In related technologies, the crease 131c is located on the side of the first end face 131e away from the second end face 131f, or at the first end face 131e. In this case, the portion of the first connecting part 131 of the bent adapter 13, located between the first end face 131e and the second end face 131f, completely covers the end face of the electrode assembly 2, resulting in significant obstruction of the electrode assembly 2. This causes the electrolyte to enter the electrode assembly 2 from the end face of the electrode assembly 2 at a slower rate, affecting the wetting efficiency of the battery 10.

[0105] Unlike related technologies, in this invention, such as Figure 10 and Figure 22 As shown, when the adapter component 13 is in the unfolded state, the crease 131c is located between the first end face 131e and the second end face 131f. Thus, when the adapter component 13 is in the folded state, the portion of the first adapter part 131 located between the first end face 131e and the second end face 131f no longer completely obstructs the end face of the electrode assembly 2. Instead, the portion between the first end face 131e and the crease 131c is bent and no longer obstructs the end face of the electrode assembly 2. Therefore, this facilitates faster electrolyte wetting and improves the wetting efficiency of the battery 10.

[0106] In addition, positioning the crease 131c between the first end face 131e and the second end face 131f also helps to shorten the dimension (i.e., length) of the second adapter portion 132 along the first direction L, thereby reducing the resistance of the battery 10.

[0107] Meanwhile, the crease 131c is located between the first end face 131e and the second end face 131f, which also facilitates the avoidance of the injection hole 11b by the adapter 13, which is beneficial to improving the injection efficiency.

[0108] In related technologies, the crease 131c is located on the side of the first end face 131e away from the second end face 131f, or is roughly flush with the first end face 131e. This causes a part of the adapter 13 to be located directly below the injection hole 11b after bending. This results in the adapter 13 blocking the electrolyte injected through the injection hole 11b during the injection process, affecting the injection efficiency.

[0109] By positioning the crease 131c between the first end face 131e and the second end face 131f, the present invention ensures that the adapter component 13 is no longer positioned directly below the injection hole 11b after folding, thereby reducing the obstruction of the electrolyte by the adapter component 13 during the injection process and improving the injection efficiency.

[0110] For example, refer to Figure 5 In some embodiments, after the first adapter 131 is bent relative to the second adapter 132 along the crease 131c, the projection of the adapter 13 along the axial direction of the injection hole 11b does not overlap with the projection of the injection hole 11b. In other words, after bending (i.e., when the adapter 13 is in a folded state), the projection of the injection hole 11b on the surface perpendicular to the second direction H does not overlap with the adapter 13. Thus, in the radial direction of the injection hole 11b, the adapter 13 can avoid the injection hole 11b, reducing obstruction to the electrolyte during the injection process, and facilitating smoother injection of the electrolyte into the housing 3 through the injection hole 11b, thereby improving the injection efficiency.

[0111] As one embodiment in which the crease 131c is located between the first end face 131e and the second end face 131f, see reference to Figure 5 , Figure 6 , Figure 10 and Figure 19-23In some embodiments, the first transition portion 131 is provided with at least one first notch 131d, which is located on at least one side of the crease 131c along the third direction W. Specifically, the first notch 131d is located on the side of the first transition portion 131 closer to the second transition portion 132. The crease 131c extends to the first notch 131d. Thus, under the action of the first notch 131d, the first transition portion 131 and the second transition portion 132 can more conveniently and accurately bend relative to each other at the crease 131c located between the first end face 131e and the second end face 131f.

[0112] Specifically, refer to Figure 10 and Figure 22 In some embodiments, the first transition portion 131 has two first notches 131d on the side near the second transition portion 132. These two first notches 131d are located on both sides of the crease 131c along the third direction W, that is, a first notch 131d is provided at each end of the crease 131c along the third direction W. Furthermore, both ends of the crease 131c (specifically, both ends along the third direction W) extend to the two first notches 131d. The two first notches 131d are, for example, symmetrically arranged on both sides of the crease 131c along the third direction W. Based on this, during the bending process, the first transition portion 131 and the second transition portion 132 are less likely to deviate from each other.

[0113] Among them, reference Figure 10-11 In some embodiments, when the adapter 13 is in the deployed state, the first notch 131d extends along the first direction L, or, referring to Figure 22-23 In other embodiments, when the adapter 13 is in the unfolded state, the first notch 131d extends along a direction intersecting the first direction L.

[0114] Furthermore, continue to refer to Figure 22-23 In some embodiments, where the first notch 131d extends along a direction intersecting the first direction L, the first notch 131d is inclined toward the middle of the third direction W of the transition member 13 along the direction from the first end face 131e to the second end face 131f. This results in a smaller width at the crease 131c, making it easier for the first transition member 131 and the second transition member 132 to bend relative to each other at the crease 131c.

[0115] The specific shape of the first gap 131d can vary.

[0116] For example, refer to Figure 11 In some embodiments, the outline of the first notch 131d is a straight line, and the width of each segment of the first notch 131d is basically the same.

[0117] For example, refer to Figure 22-23In other embodiments, the first notch 131d includes an arc-shaped notch portion 131i, the outline of which is arc-shaped. The arc-shaped notch portion 131i is located, for example, at one end of the first notch 131d near the second end face 131f; that is, the portion of the first notch 131d near the second end face 131f is constructed as the arc-shaped notch portion 131i. This not only facilitates the processing of the first notch 131d but also helps reduce stress concentration, improves the stress state of the transition component 13, and enhances the load-bearing capacity of the transition component 13. Specifically, referring to... Figure 22-23 In some embodiments, the first notch 131d further includes a first notch segment 131j, which is sequentially connected to the arc-shaped notch portion 131i along the direction from the first end face 131e to the second end face 131f, and the first notch segment 131j is constructed as a non-arc-shaped notch portion. In this case, the arc-shaped notch portion 131i can also be referred to as the second notch segment. Along the direction from the first end face 131e to the second end face 131f, the dimension (i.e., width) of the first notch segment 131j in the third direction W gradually decreases. For example, a rounded corner is provided at the connection between the first notch segment 131j and the arc-shaped notch portion 131i to further improve stress concentration.

[0118] Additionally, refer to Figure 5-11 as well as Figure 19-23 In some embodiments, the adapter 13 further includes a third adapter 133, through which the second adapter 132 is electrically connected to the electrode terminal 12. Furthermore, the second adapter 132 is bendable relative to the third adapter 133, meaning the second adapter 132 can be bent relative to both the first adapter 131 and the third adapter 133. Thus, when the adapter 13 is in the unfolded state, the third adapter 133 is connected to the end of the second adapter 132 that is away from the first adapter 131. In other words, the first adapter 131, the second adapter 132, and the third adapter 133 are arranged along the first direction L and connected in sequence. When the adapter 13 is in the folded state, the first adapter 131 covers the end face of the electrode assembly 2, while the second adapter 132 is stacked on the side of the first adapter 131 that is away from the electrode assembly 2, and the third adapter 133 is stacked on the side of the second adapter 132 that is away from the electrode assembly 2. That is, the second adapter 132 and the third adapter 133 are stacked in sequence on the side of the first adapter 131 that is away from the electrode assembly 2 along the direction away from the electrode assembly 2.

[0119] Among them, reference Figure 5-11 as well as Figure 19-23 In some embodiments, the first adapter 131 is provided with a through hole 131b and a connecting portion 13d.

[0120] A through-hole 131b extends through the first adapter 131 along the second direction H, facilitating both positioning and electrolyte flow. During assembly, the relative positions of the adapter 13 and the electrode assembly 2 in the first direction L and the third direction W can be determined based on the through-hole 131b. For example, the through-hole 131b can be aligned with the winding center of the electrode assembly 2. Simultaneously, during electrolyte injection, the electrolyte can flow to the electrode assembly 2 through the through-hole 131b, improving wetting and injection efficiency.

[0121] The connecting part 13d is used to connect with the electrode assembly 2, that is, the first adapter part 131 is connected to the electrode assembly 2 through the connecting part 13d. The connecting part 13d and the electrode assembly 2 can be connected by welding or riveting.

[0122] The connecting portion 13d is, for example, a boss protruding towards the electrode assembly 2 from the first adapter portion 131, to further facilitate welding of the connecting portion 13d to the tab 21. In this case, the connecting portion 13d is formed, for example, by stamping. After stamping, a groove 131a is formed on the surface of the first connecting portion 131 away from the electrode assembly 2. The connecting portion 13d and the groove 131a are correspondingly provided in the thickness direction of the adapter 13. The groove 131a is, for example, V-shaped.

[0123] Continue to refer to Figure 5-11 as well as Figure 19-23 In some embodiments, at least a portion of the connecting portion 13d is located on the protrusion 131h, that is, on the third direction W, the connecting portion 13d also protrudes from the crease 131c.

[0124] Additionally, refer to Figure 10 and Figure 22 In some embodiments, when the adapter 13 is in the unfolded state, along the direction from the first adapter 131 to the second adapter 132, that is, along the direction from the second end face 131f to the first end face 131e, the groove 131a protrudes from the crease 131c. Since the connecting portion 13d corresponds to the groove 131a, the connecting portion 13d also protrudes from the crease 131c. In other words, in the first direction L, the connecting portion 13d extends to the side of the crease 131c near the first end face 131e. In this way, the crease 131c can be located between the first end face 131e and the second end face 131f, improving the wetting efficiency. It also helps to have a larger connection area between the connecting portion 13d and the tab 21, enhancing the connection reliability between the connecting portion 13d and the tab 21, and improving the overcurrent capacity of the battery 10.

[0125] Specifically, refer to Figure 5 and Figure 21In some embodiments, the first adapter 131 is provided with two connecting portions 13d, which are symmetrically arranged on the first adapter 131, for example, on the first adapter 131 and symmetrically arranged about the through hole 131b.

[0126] In addition, refer to Figure 10 and Figure 22 In some embodiments, a third notch 13e is provided between the second end faces 131f of the two protrusions 131h of the first adapter portion 131. The third notch 13e is recessed along the direction from the second end face 131f toward the first end face 131e. The advantage of this arrangement is that, on the one hand, for the first end cap assembly, it helps to reduce the obstruction of the end face of the electrode assembly 2 by the first adapter portion 131 and improve the wetting efficiency; on the other hand, for the second end cap assembly, the third notch 13e is located on the side of the explosion-proof valve 18 closer to the electrode assembly 2, which facilitates the action of high-pressure gas on the explosion-proof valve 18, making the explosion-proof valve 18 open more reliably under the predetermined pressure.

[0127] Reference Figure 6 , Figure 10 , Figure 18 and Figure 22 In some embodiments, the third adapter 133 is provided with a first connection hole 133a, which corresponds one-to-one with the electrode terminal 12. The electrode terminal 12 passes through the first connection hole 133a to realize the connection between the third adapter 133 and the electrode terminal 12. The third adapter 133 is also constructed as a disc shape, for example, having a width greater than that of the second adapter 132.

[0128] To facilitate the relative bending of the third adapter 133 and the second adapter 132, refer to Figure 10 and Figure 22 In some embodiments, a second notch 132a is provided at the connection between the third transition portion 133 and the second transition portion 132. The second notch 132a extends, for example, from the edge of the second transition portion 132 along the third direction W towards the center of the second transition portion 132 along the third direction W; that is, the second notch 132a is recessed from the edge of the second transition portion 132 along the third direction W towards the center of the second transition portion 132 along the third direction W. Furthermore, referring to… Figure 10 and Figure 22 In some embodiments, a second notch 132a is provided on each side of the second transition portion 132 along the third direction W, that is, two second notches 132a are provided on both sides of the second transition portion 132 along the third direction W. In this way, the third transition portion 133 and the second transition portion 132 can be bent relative to each other more easily at the second notch 132a.

[0129] Additionally, refer to Figure 6 and Figure 20In some embodiments, the end cap assembly 1 further includes a first insulating element 15, a second insulating element 16, a connecting block 17, and a hole plug 141, etc.

[0130] The first insulating member 15 and the second insulating member 16 are located on the side of the end cap 11 that is closer to and farther away from the electrode assembly 2, respectively, and play an insulating role to reduce the risk of short circuit.

[0131] The first insulating element 15 and the second insulating element 16 are made of insulating materials such as plastic.

[0132] Reference Figure 12 In some embodiments, the first insulating member 15 includes an insulating body 151 and a limiting ring 152 and a support portion 153 disposed on the insulating body 151.

[0133] In accordance with the overall shape of the cylindrical battery, the insulating body 151 is approximately circular. Furthermore, referring to... Figure 6 , Figure 12 and Figure 18 The insulating body 151 is provided with a second connecting hole 151a, through which the electrode terminal 12 passes. The second connecting hole 151a corresponds one-to-one with the electrode terminal 12.

[0134] The limiting ring 152 is used to limit the lateral displacement (i.e., displacement in a plane perpendicular to the second direction H) of the transition component 13, etc., to reduce the risk of short circuit. (Refer to...) Figure 5 , Figure 12 , Figure 16 and Figure 19 The limiting ring 152 protrudes towards the electrode assembly 2 relative to the insulating body 151 and is disposed on the periphery of the adapter 13 to prevent the adapter 13 from contacting the housing 3, so as to prevent the adapter 13 from contacting the housing 3 and causing a short circuit problem when the battery 10 shakes or the adapter 13 is bent.

[0135] Specifically, refer to Figure 5 , Figure 15-16 and Figure 19 The inner diameter of the limiting ring 152 is larger than the maximum dimensions of the adapter 13 in the first direction L and the third direction W when it is in the folded state. The limiting ring 152 extends from the insulating body 151 toward the electrode assembly 2 to the side of the first adapter 131 near the electrode assembly 2, so that the limiting ring 152 surrounds the periphery of the first adapter 131. In this way, the adapter 13 in the folded state is entirely within the range defined by the limiting ring 152, so that the limiting ring 152 can limit the lateral displacement of the adapter 13 to a certain extent and prevent the adapter 13 from contacting the housing 3 due to excessive lateral displacement.

[0136] More specifically, refer to Figure 16In some embodiments, the limiting ring 152 extends not only to the side of the first adapter 131 near the electrode assembly 2, but also further to the end of the tab 21 near the end cap 11. In this case, the limiting ring 152 not only surrounds the outer periphery of the adapter 13, but also surrounds the outer periphery of the end of the tab 21 near the end cap 11. Thus, the limiting ring 152 can limit the lateral displacement of the adapter 13, and also limit the lateral displacement of the electrode assembly 2 to a certain extent, preventing the electrode assembly 2 from contacting the housing 3 due to excessive lateral displacement, causing a short circuit, and preventing the tab 21a from bending towards the housing 3, causing a short circuit.

[0137] Among them, reference Figure 12 In some embodiments, the limiting ring 152 is constructed as a continuous circular ring. However, the limiting ring 152 is not a closed ring, and an extension opening 152a is provided between the two free ends of the limiting ring 152 for the second connecting portion 132 of the connecting component 13 in the unfolded state to extend out. Based on this, the limiting ring 152 can reliably limit the lateral displacement of the connecting component 13, etc., reducing the risk of short circuits, while also facilitating the assembly of the connecting component 13 into the end cap assembly 1 in the unfolded state before folding it.

[0138] The support portion 153 is used to limit the longitudinal displacement (i.e., displacement along the second direction H) of the electrode assembly 2, etc., to prevent excessive longitudinal displacement of the electrode assembly 2, which could affect the performance and safety of the battery 10. (Refer to...) Figure 12 and Figure 18 The support portion 153 protrudes towards the electrode assembly 2 relative to the insulating body 151 and is supported between the insulating body 151 and the first adapter portion 131. In this way, the support portion 153 restricts the longitudinal displacement of the electrode assembly 2 by abutting against the first adapter portion 131, which helps to reduce the shaking of the electrode assembly 2 and enables the battery 10 to work more safely and reliably.

[0139] Specifically, refer to Figure 12 In some embodiments, the support portion 153 is constructed as an arc segment. In this case, the contact area between the support portion 153 and the first transition portion 131 is larger, thereby more reliably limiting the longitudinal displacement of the electrode assembly 2.

[0140] Additionally, refer to Figure 12 In some embodiments, the insulating body 151 is provided with two support portions 153, which are arranged opposite to each other on both sides of the second adapter portion 132 to more smoothly abut and limit the first adapter portion 131.

[0141] The second insulating member 16 and the connecting block 17 are disposed on the end cap 11 and arranged sequentially in a direction away from the electrode assembly 2. That is, the second insulating member 16 is located between the connecting block 17 and the end cap 11 to achieve insulation between the end cap 11 and the connecting block 17. (Refer to...) Figure 6 The second insulating member 16 and the connecting block 17 are respectively provided with a third connecting hole 161 and a fourth connecting hole 171. The third connecting hole 161 and the fourth connecting hole 171 are respectively provided with corresponding electrode terminals 12. The electrode terminals 12 extend from the electrode lead-out hole 11a and pass through the third connecting hole 161 and the fourth connecting hole 171 in sequence to achieve connection with the second insulating member 16 and the connecting block 17.

[0142] The plug 141 is used to seal the injection port 11b. For example... Figure 16 As shown, the plug 141 extends into the injection hole 11b and protrudes from the side of the injection hole 11b closest to the electrode assembly 2. After the electrolyte injection is completed, the plug 141 is inserted into the injection hole 11b to prevent the injected electrolyte from flowing out of the injection hole 11b and causing leakage.

[0143] At the same time, refer to Figure 6 as well as Figure 15-17 In some embodiments, the end cap assembly 1 further includes a sealing member 142, which is disposed on the end cap 11 and seals the axial end face of the injection hole 11b away from the electrode assembly 2. For example, the sealing member 142 is disposed at the end of the plug 141 away from the electrode assembly 2 and is connected to the end cap 11. Based on this, the sealing member 142 can improve the sealing effect of the injection hole 11b and reduce the risk of the plug 141 falling off. While performing the sealing function, the sealing member 142 also prevents the plug 141 from falling out of the injection hole 11b by restricting the displacement of the plug 141 towards the side away from the electrode assembly 2, which helps to further improve the sealing effect and reduce the risk of electrolyte leakage.

[0144] In order to achieve the connection between the sealing component 142 and the end cap 11, refer to Figure 6 In some embodiments, the end cap 11 is provided with a receiving groove 11c, and the sealing member 142 is received in the receiving groove 11c and welded to the end cap 11. In this way, the sealing member 142 can be more firmly fixed to the end cap 11, thereby improving the sealing effect more reliably and preventing the plug 141 from falling off.

[0145] Continue to refer to Figure 5 and Figure 16In some embodiments, when the adapter 13 is in a folded state, the projection of the adapter 13 along the axial direction of the injection hole 11b does not overlap with the projection of the plug 141. That is, the projection of the plug 141 on the plane perpendicular to the axial direction of the injection hole 11b does not overlap with the adapter 13. This helps to reduce the risk of the adapter 13 colliding with the plug 141 when it moves away from the electrode assembly 2 under conditions such as shaking, and avoids the adapter 13 affecting the installation of the sealing member 142 and the reliability of the installation of the sealing member 142, thereby achieving a more tight sealing effect.

[0146] In order to improve the reliability of the hole plug 141, reference is made to... Figure 13 and Figure 16 In some embodiments, the end cap 11 includes a body portion 111, a first boss 112, and a second boss 113. The first boss 112 protrudes from the body portion 111 toward the electrode assembly 2, and the second boss 113 protrudes from the first boss 112 toward the electrode assembly 2. The injection hole 11b passes through the first boss 112 and the second boss 113. By adding a second boss 113 to the body portion 111 and the first boss 112, and making the injection hole 11b pass through the first boss 112 and the second boss 113, the axial length of the injection hole 11b is increased. This increases the contact area between the plug 141 and the injection hole 11b, reduces the risk of the plug 141 falling off, and allows the plug 141 to be more reliably positioned in the injection hole 11b. In this case, refer to Figure 6 and Figure 16 In some embodiments, the insulating body 151 is provided with a mating groove 151b, which is formed, for example by stamping, for accommodating the first boss 112, so as to achieve a tighter fit between the end cap 11 and the first insulating member 15.

[0147] In addition, refer to Figure 17In some embodiments, the battery 10 further includes a protective member 143 for preventing the plug 141 from contacting the adapter 13, etc. The protective member 143 protrudes relative to the plug 141 in a direction closer to the electrode assembly 2; that is, the end of the protective member 143 closer to the electrode assembly 2 is closer to the electrode assembly 2 than the end of the plug 141 closer to the electrode assembly 2. In other words, in the second direction H, the distance between the protective member 143 and the electrode assembly 2 is less than the distance between the plug 141 and the electrode assembly 2. In this way, the protective component 143 can provide a certain degree of protection for the plug 141, preventing other structural components inside the housing 3, such as the adapter component 13 or the electrode assembly 2, from colliding with the plug 141 due to upward movement during the shaking of the battery 10, thus preventing the plug 141 from falling off. In other words, the protective component 143 can reduce the risk of the plug 141 falling off by preventing other structural components inside the housing 3 from directly impacting the plug 141. Furthermore, by preventing the plug 141 from moving away from the electrode assembly 2 due to impact, it avoids affecting the installation of the sealing component 142 and the reliability of the installation of the sealing component 142, thereby achieving a more tight sealing effect.

[0148] The protective element 143 is, for example, disposed on the first insulating element 15, and protrudes from the first insulating element 15 toward the side closer to the electrode assembly 2. Specifically, refer to... Figure 12 and Figure 17 The protective member 143 is disposed on the insulating body 151 and protrudes from the insulating body 151 toward the electrode assembly 2. More specifically, the protective member 143 is disposed on the boss formed by stamping the aforementioned mating groove 151b. The protective member 143 is, for example, constructed as a protruding post. Referring to... Figure 5 and Figure 16 In some embodiments, the insulating body 151 is provided with a mating hole 151c, and a plug 141 passes through the mating hole 151c and extends out from the side of the mating hole 151c near the electrode assembly 2. However, the bottom end of the plug 141 is still higher than the bottom end of the protective member 143, so that when the electrode assembly 2 moves upward, the protective member 143 can contact the adapter 13 before the plug 141, thereby preventing the plug 141 from being impacted by the adapter 13, etc., and playing a protective role. Among them, the mating hole 151c passes through, for example, the boss formed by stamping the aforementioned mating groove 151b.

[0149] Furthermore, there is no specific limit to the number of protective components 143; there can be one, two, or more. For example, refer to... Figure 12 and Figure 17 In some embodiments, the battery 10 includes two protective members 143 arranged opposite each other on both sides of the injection hole 11b to more stably and reliably protect the hole plug 141.

[0150] Reference Figure 24The method for manufacturing the battery 10 provided by the present invention includes the following steps:

[0151] S110, the first adapter 131 is bent between the first end face 131e and the second end face 131f of the first adapter 131 relative to the second adapter 132.

[0152] The above description is merely an exemplary embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A battery, characterized in that, The device includes a housing (3), an electrode assembly (2), and an end cap assembly (1). The end cap assembly 1 includes an end cap (11), an electrode terminal (12), a connecting component (13), and a first insulating component (15). The end cap (11) closes the end opening of the housing (3). The housing (3) has a cavity (31) inside, and the electrode assembly (2) is housed in the cavity (31). The end cap (11) includes a body portion (111), a first boss (112), and a second boss (113). The first boss (112) protrudes from the body portion (111) toward the electrode assembly (2), and the second boss (113) protrudes from the first boss (112) toward the electrode assembly (2). An injection hole (11b) passes through the first boss (112) and the second boss (113). The electrode terminal (12) is disposed on the end cap (11) and connected to the connecting component (13). The adapter (13) is electrically connected to the electrode assembly (2). The adapter (13) includes a first adapter (131), which is electrically connected to the electrode assembly (2). The first insulating member (15) is located on the side of the end cap (11) near the electrode assembly (2). The first insulating member (15) includes an insulating body (151), a limiting ring (152) and a support (153) disposed on the insulating body (151). The limiting ring (152) protrudes relative to the insulating body (151) in a direction close to the electrode assembly (2). The limiting ring (152) surrounds the periphery of the adapter (13) and the periphery of the electrode tab (21) of the electrode assembly. The support (153) protrudes relative to the insulating body (151) in a direction close to the electrode assembly (2) and is supported between the insulating body (151) and the first adapter (131).

2. The battery according to claim 1, characterized in that, The battery (10) includes a plug (141) for sealing the injection hole (11b), the plug (141) extending into the injection hole (11b) on the first boss (112) and the second boss (113).

3. The battery according to claim 1, characterized in that, The insulating body (151) is provided with a mating groove (151b), which is used to accommodate the first boss (112).

4. The battery according to claim 3, characterized in that, A boss (154) corresponding to the mating groove (151b) is formed on the side opposite to the mating groove (151b). The insulating body (151) is provided with a mating hole (151c). The mating hole (151c) is disposed through the boss (154) corresponding to the mating groove (151b). The plug (141) for sealing the injection hole (11b) passes through the mating hole (151c) and extends out from the side of the mating hole (151c) near the electrode assembly (2).

5. The battery according to claim 4, characterized in that, The second boss (113) extends into the mating hole (151c).

6. The battery according to claim 5, characterized in that, The second boss (113) is clearance-fitted with the mating hole (151c); and / or The end face of the second boss (113) does not extend beyond the end face of the boss (154) corresponding to the mating groove (151b); and / or The maximum outer diameter of the second boss (113) is smaller than the minimum outer diameter of the first boss (112).

7. The battery according to claim 1, characterized in that, The injection hole (11b) has the same diameter on the first boss (112) and the second boss (113).

8. The battery according to any one of claims 1-7, characterized in that, The battery (10) is a cylindrical battery.

9. A battery pack, characterized in that, Includes the battery (10) as described in any one of claims 1-8.

10. An electrical appliance, characterized in that, Includes the battery pack (102) as described in claim 9, the battery pack (102) being used to provide electrical energy.

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