Battery, vehicle and battery assembly method

Abstract

The invention discloses a battery, a vehicle and a battery assembly method.The battery comprises a shell, a roll core, a negative collector plate and an elastic piece, the shell extends in the first direction and defines a containing cavity, one end of the shell in the first direction extends inwards in the radial direction of the shell to form a limiting flange, the roll core is installed in the containing cavity and is spaced from the limiting flange, and the elastic piece is installed in the shell; the negative collector plate is arranged in the accommodating cavity and comprises a welding part and a crimping part which are connected, the welding part is welded with the roll core, and the crimping part comprises a first limiting surface and a second limiting surface which are arranged at an interval along a first direction and are oppositely arranged; the elastic piece is clamped between the first limiting surface and the second limiting surface, and the crimping part is clamped between the roll core and the limiting flange by pressing the elastic piece to deform. The battery provided by the invention has the advantages that the connection between the negative current collector plate and the shell is reliable, and the manufacturing cost of the battery is low.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly relates to a battery, a vehicle, and a battery assembly method. Background Art

[0002] In related technologies, the assembly process of all-pole-ear batteries such as cylindrical batteries usually uses laser welding to complete the welding of the negative current collector plate and the housing. However, since the housing is circular, whether internal lap welding or external penetration welding is used between the negative current collector plate and the housing, there is a change in the focal length during the laser welding process, which is likely to penetrate and damage the housing or cause false welding. When the housing deforms during the subsequent roller grooving and squat sealing processes, the current collector plate may also become unsoldered; moreover, welding slag is generated during the welding process, increasing the risk of battery short circuit; furthermore, the cost of cylindrical battery laser welding equipment is high, increasing the battery assembly cost. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related technologies to some extent.

[0004] To this end, an embodiment of the present invention provides a battery, which has the advantages of reliable connection between the negative current collector plate and the housing and low battery assembly cost.

[0005] An embodiment of the present invention further provides a vehicle.

[0006] An embodiment of the present invention further provides a battery assembly method.

[0007] The battery according to an embodiment of the present invention includes a housing, a wound core, a negative current collector plate, and an elastic member. The housing extends along a first direction and defines a receiving cavity. One end of the housing in the first direction extends radially inward along the housing to form a limiting flange; the wound core is installed in the receiving cavity and is spaced apart from the limiting flange; the negative current collector plate is disposed in the receiving cavity and includes a welded portion and a crimped portion connected to each other. The welded portion is welded to the wound core, and the crimped portion includes a first limiting surface and a second limiting surface that are arranged at intervals along the first direction and are oppositely disposed; the elastic member is clamped between the first limiting surface and the second limiting surface, and the crimped portion is clamped between the wound core and the limiting flange by pressing the elastic member to deform.

[0008] According to the battery of the embodiment of the present invention, the negative electrode collector disc arranged in the accommodating cavity is electrically connected to the winding core by welding the welding part to the winding core, and is electrically connected to the shell by abutting the crimping part with the limiting flange of the shell. Among them, the elastic member in elastic deformation always gives the first limiting surface and the second limiting surface a force to move in opposite directions, thereby ensuring that there is a stable and reliable interaction force between the crimping part and the limiting flange, so that the negative electrode collector disc and the shell are reliably connected. Moreover, compared with the method of using laser welding to connect the negative electrode collector disc and the shell in the related art, the assembly of the battery in this embodiment does not require the use of high-cost laser welding equipment, while avoiding the generation of welding slag, reducing the risk of battery short circuit, and the battery assembly has a high yield and low cost.

[0009] In some embodiments, the crimping portion includes a connected annular substrate and an annular pressure plate, the inner circumference of the annular substrate is connected to the welding portion, the annular pressure plate is located on the side of the annular substrate away from the winding core, at least a portion of the annular pressure plate is bent along the radial direction of the annular substrate, and the first limiting surface and the second limiting surface are respectively arranged on the annular pressure plate and the annular substrate.

[0010] In some embodiments, the first end of the annular pressure plate is connected to the outer peripheral edge of the annular substrate, at least a portion of the annular pressure plate is bent radially inward along the annular substrate, the second end of the annular pressure plate is spaced apart from the annular substrate in the first direction, a first annular groove is defined between the annular pressure plate and the annular substrate, and the elastic member is fitted in the first annular groove.

[0011] In some embodiments, the elastic member includes an O-ring, and the O-ring is fitted in the first annular groove.

[0012] In some embodiments, the welding portion includes a plurality of welding plates arranged at intervals along the circumference of the annular substrate, the welding plates are connected to the inner circumference of the annular substrate, and all of the welding plates jointly define a liquid injection hole.

[0013] In some embodiments, the welding plates are fan-shaped plates, and a strip-shaped gap extending radially along the annular substrate is formed between any two adjacent welding plates.

[0014] In some embodiments, the battery further includes an annular support plate, which is disposed in the accommodating cavity, and the annular support plate is sleeved on the welding portion and sandwiched between the annular substrate and the winding core.

[0015] In some embodiments, the annular support plate has a first surface and a second surface opposite to each other in the first direction. The inner peripheral surface of the annular support plate is smoothly connected to each of the first surface and the second surface, and the outer peripheral surface of the annular support plate is smoothly connected to each of the first surface and the second surface.

[0016] In some embodiments, the limiting flange is connected end to end along the circumferential direction of the housing, and a second annular groove is provided on the inner peripheral surface of the limiting flange;

[0017] The battery further includes an end plate, and the outer periphery of the end plate is fitted in the second annular groove.

[0018] The technical advantages of the vehicle according to the embodiments of the present invention are the same as those of the battery in the above embodiments, and will not be elaborated here.

[0019] According to the battery assembly method of the embodiments of the present invention, based on the battery as described in any one of the above embodiments, the method includes the following steps:

[0020] Place the wound core, the negative current collector plate, and the elastic member in the housing in sequence along the first direction;

[0021] Roll the peripheral wall of the housing inward along the radial direction of the housing to form a third annular groove on the outer peripheral surface of the housing. The part of the housing where the third annular groove is formed presses against the side of the negative current collector plate facing away from the wound core and compresses the elastic member to deform;

[0022] Place the end plate above the part of the housing where the third annular groove is formed, and close the peripheral wall of the housing above the third annular groove inward along the radial direction of the housing to wrap the end plate;

[0023] Compress the part of the housing where the third annular groove is formed along the first direction until the third annular groove is eliminated.

[0024] According to the battery assembly method of the embodiments of the present invention, after the wound core, the negative current collector plate, and the elastic member are placed in the housing in sequence along the first direction, directly performing the roller groove process and the squat sealing process can realize the reliable connection between the negative current collector plate and the housing, without laser welding, and the battery assembly has a high yield rate and low cost.

[0025] In some embodiments, the negative current collector plate includes a crimping part and a welding part, the elastic member includes an O-ring, and the step of placing the wound core, the negative current collector plate, and the elastic member in the housing in sequence along the first direction further includes:

[0026] Weld the welding part to the wound core and place the O-ring on the crimping part.

[0027] The vehicle according to the embodiments of the present invention includes the battery as described in any one of the above embodiments.

[0028] In some embodiments, the crimping portion includes a connected annular base plate and an annular pressing plate, the inner periphery of the annular base plate is connected to the welding portion, and the annular pressing plate is located on a side of the annular base plate away from the winding core;

[0029] The step of rolling the circumferential wall of the shell inwardly along the radial direction of the shell to form a third annular groove on the outer circumferential surface of the shell, wherein the portion of the shell in which the third annular groove is formed presses against a side of the negative electrode current collector away from the winding core and compresses the elastic member to deform further comprises:

[0030] When the peripheral wall of the shell is deformed, the annular pressing plate is pressed to bend radially inwardly along the annular base plate, so that the annular pressing plate clamps the O-ring toward the annular base plate and presses the O-ring to deform. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of a battery according to an embodiment of the present invention, wherein the casing is not subjected to the rolling groove step.

[0032] Figure 2 is another schematic diagram of a battery according to an embodiment of the present invention, wherein the shell has completed the rolling groove step but has not completed the squat sealing step.

[0033] Figure 3 is another schematic diagram of a battery according to an embodiment of the present invention, wherein the shell has completed the squat sealing step.

[0034] Figure 4 Schematic diagram of a negative electrode current collecting disk in a battery according to an embodiment of the present invention.

[0035] Figure 5 is a schematic diagram of an annular support plate in a battery according to an embodiment of the present invention.

[0036] Figure 6 is a cross-sectional view of an annular support plate in a battery according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1. Shell; 11. Limiting flange; 111. Third annular groove; 2. Winding core; 3. Negative electrode current collecting plate; 31. Welding portion; 311. Welding plate; 312. Strip gap; 313. Liquid injection hole; 32. Crimping portion; 321. Annular substrate; 322. Annular pressure plate; 323. First annular groove; 3231. First limiting surface; 3232. Second limiting surface; 4. Elastic member; 5. Annular support plate; 6. End plate. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] The following will describe a battery according to an embodiment of the present invention in conjunction with Figures 1-6 the description of the battery according to the embodiment of the present invention.

[0041] The battery according to the embodiment of the present invention includes a housing 1, a wound core 2, a negative current collector plate 3, and an elastic member 4. The housing 1 extends in a first direction and defines a receiving cavity. One end of the housing 1 in the first direction extends radially inward along the housing 1 to form a limiting flange 11. The wound core 2 is installed in the receiving cavity and is spaced apart from the limiting flange 11. The negative current collector plate 3 is disposed in the receiving cavity and includes a connected welding portion 31 and a crimping portion 32. The welding portion 31 is welded to the wound core 2, and the crimping portion 32 includes a first limiting surface 3231 and a second limiting surface 3232 that are arranged at intervals in the first direction and are oppositely disposed. The elastic member 4 is clamped between the first limiting surface 3231 and the second limiting surface 3232, and the crimping portion 32 is clamped between the wound core 2 and the limiting flange 11 by deforming the elastic member 4 under pressure.

[0042] For the battery according to the embodiment of the present invention, the negative current collector plate 3 disposed in the receiving cavity is electrically connected to the wound core 2 by welding the welding portion 31 to the wound core 2, and is electrically connected to the housing 1 by abutting the crimping portion 32 against the limiting flange 11 of the housing 1. Among them, the elastic member 4 in elastic deformation always gives the first limiting surface 3231 and the second limiting surface 3232 forces to move in opposite directions, thereby ensuring a stable and reliable mutual acting force between the crimping portion 32 and the limiting flange 11, and further making the connection between the negative current collector plate 3 and the housing 1 reliable. Moreover, compared with the method of using laser welding to connect the negative current collector plate 3 and the housing 1 in the related art, the battery assembly in this embodiment does not require the use of high-cost laser welding equipment, and at the same time avoids the generation of welding slag, reduces the risk of battery short circuit, and has a high yield rate and low cost in battery assembly.

[0043] It should be noted that when the crimping portion 32 is not limited by the wound core 2 and the limiting flange 11 in the first direction, that is, when the elastic member 4 is not deformed by the common compression of the limiting flange 11 and the wound core 2, the maximum dimension of the crimping portion 32 in the first direction is greater than the distance between the limiting flange 11 and the wound core 2. Thus, it is effectively ensured that the crimping portion 32 is tightly and reliably pressed against the limiting flange 11 under the compression of the elastic member 4.

[0044] In some embodiments, as Figures 2-4 shown, the crimping portion 32 includes a connected annular substrate 321 and an annular pressing plate 322. The inner peripheral edge of the annular substrate 321 is connected to the welding portion 31. The annular pressing plate 322 is located on the side of the annular substrate 321 away from the wound core 2. At least a part of the annular pressing plate 322 is bent radially along the annular substrate 321. The first limiting surface 3231 and the second limiting surface 3232 are respectively disposed on the annular pressing plate 322 and the annular substrate 321.

[0045] That is, by bending at least part of the annular pressing plate 322 along the radial direction of the annular base plate 321, so that the part of the annular pressing plate 322 is spaced apart from the annular base plate 321 in the first direction, the first limiting surface 3231 and the second limiting surface 3232 that are arranged opposite to each other are formed respectively. At this time, the elastic member 4 is sandwiched between the annular base plate 321 and the part of the annular pressing plate 322, and the elastically deformed elastic member 4 gives the annular pressing plate 322 a force to bend and move in a direction away from the annular base plate 321, so that the annular pressing plate 322 is tightly and reliably pressed against the limiting flange 11.

[0046] Specifically, the negative electrode current collecting plate 3 is made of copper, and at least part of the annular pressure plate 322 is compressed during the rolling process, resulting in radial bending along the annular substrate 321. At this time, the annular pressure plate 322 itself has a tendency to rebound in a direction away from the annular substrate 321, thereby further ensuring that the annular pressure plate 322 is in close contact with the limiting flange 11.

[0047] In some embodiments, Figures 1-4 As shown, the first end of the annular pressure plate 322 is connected to the outer peripheral edge of the annular base plate 321, at least a portion of the annular pressure plate 322 is bent radially inward along the annular base plate 321, the second end of the annular pressure plate 322 is spaced apart from the annular base plate 321 in a first direction, a first annular groove 323 is defined between the annular pressure plate 322 and the annular base plate 321, and the elastic member 4 is fitted in the first annular groove 323.

[0048] At this time, in the rolling groove process of the shell 1, the annular pressure plate 322 is more easily bent and deformed under the pressure of the shell 1 to wrap the elastic member 4, ensuring that the elastic member 4 is stably limited in the first annular groove 323 defined by the annular pressure plate 322 and the annular base plate 321.

[0049] Specifically, Figure 2 and Figure 3 As shown, the annular pressure plate 322 that is bent and deformed is generally an arc-shaped plate that is recessed in the direction away from the winding core 2, that is, the first annular groove 323 is designed to be narrowed at the groove. At this time, when the elastic member 4 is fitted in the first annular groove 323, it is less likely to escape from the first annular groove 323 through the groove, and the elastic compression reliability of the elastic member 4 on the annular pressure plate 322 is higher.

[0050] In some embodiments, Figures 1-3 As shown, the elastic member 4 includes an O-ring, which is fitted in the first annular groove 323 .

[0051] The O-ring presses each position of the annular pressure plate 322 more evenly, and each position of the annular pressure plate 322 contacts the limiting flange 11 more closely, so that the electrical connection reliability between the negative electrode current collecting disc 3 and the shell 1 is higher.

[0052] Specifically, the O-ring is made of a rubber material, such as a silicone O-ring.

[0053] Alternatively, in this embodiment, the elastic member 4 can also be integrally formed with the crimping portion 32, that is, the negative current collector plate 3 itself has high resilience.

[0054] In some embodiments, such as Figure 4 As shown, the welding portion 31 includes a plurality of welding plates 311 arranged at intervals along the circumference of the annular substrate 321. The welding plates 311 are connected to the inner peripheral edge of the annular substrate 321, and all the welding plates 311 together define a liquid injection hole 313.

[0055] Dividing the welding portion 31 into a plurality of welding plates 311 makes it easier for each welding plate 311 to deform relative to the annular substrate 321, so as to closely fit the negative electrode side of the core 2, ensuring the laser welding quality between the welding plate 311 and the core 2. At the same time, the liquid injection hole 313 defined by all the welding plates 311 together is located at the central position of the welding portion 31. Liquid can be injected into the battery through the liquid injection hole 313 to complete the liquid injection operation.

[0056] Specifically, as Figure 4 As shown, the welding plate 311 is a sector plate, and a strip-shaped gap 312 extending along the radial direction of the annular substrate 321 is formed between any two adjacent welding plates 311. For example, there are four welding plates 311, and the four welding plates 311 are arranged at equal intervals along the circumference of the annular substrate 321. The welding portion 31 can be stamped with strip-shaped gaps 312 and liquid injection holes 313 on a circular plate to form a plurality of welding plates 311, and the forming of the welding portion 31 is simple and convenient.

[0057] In some embodiments, such as Figures 1-3 、 Figure 5 and Figure 6 As shown, the battery further includes an annular support plate 5. The annular support plate 5 is disposed in the accommodation cavity, and the annular support plate 5 is sleeved on the welding portion 31 and clamped between the annular substrate 321 and the core 2.

[0058] That is, the annular support plate 5 and the negative current collector plate 3 jointly fill the space between the limiting flange 11 and the core 2. At this time, on the basis of a certain volume of the space between the limiting flange 11 and the core 2, the setting of the annular support plate 5 avoids the situation that only the negative current collector plate 3 fills the space between the limiting flange 11 and the core 2, which would lead to a larger volume and weight of the negative current collector plate 3, and thus a higher manufacturing cost. Moreover, the annular support plate 5 is arranged in the accommodating cavity and clamped between the annular substrate 321 and the core 2. On the one hand, it leaves the negative electrode area of the core 2 for easy welding with the welding part 31 of the negative current collector plate 3. On the other hand, it reduces the thickness of the annular substrate 321 to ensure that the thicknesses of all positions of the welding part 31 and the annular substrate 321 in the negative current collector plate 3 are the same. At this time, only by adjusting the thickness of the annular support plate 5 can it be ensured that the annular support plate 5, the annular substrate 321, the annular pressing plate 322 and the O-ring are all pressed between the core 2 and the limiting flange 11.

[0059] Specifically, the thickness of each position in the negative current collector plate 3 is 0.5 mm. The annular support ring is made of plastic with relatively high hardness, with a thickness of 1 mm, an outer diameter of 45.2 mm, and an inner diameter of 30 mm.

[0060] In some embodiments, as Figure 6 shown, the annular support plate 5 has a first surface and a second surface opposite to each other in the first direction. The inner peripheral surface of the annular support plate 5 is smoothly connected to each of the first surface and the second surface, and the outer peripheral surface of the annular support plate 5 is smoothly connected to each of the first surface and the second surface.

[0061] That is, chamfers are provided on the inner edges and outer edges of the first surface and the second surface of the annular support plate 5, which not only facilitates the fitting of the annular support plate 5 in the accommodating cavity while avoiding damage to the core 2, but also facilitates the fitting of the welding part 31 of the negative current collector plate 3 in the through hole of the annular support ring.

[0062] As Figure 3 shown, the limiting flange 11 is connected end to end along the circumferential direction of the housing 1, and a second annular groove is provided on the inner peripheral surface of the limiting flange 11. The battery further includes an end plate 6, and the outer peripheral edge of the end plate 6 is fitted in the second annular groove, thereby realizing the closing of the through hole formed by the limiting flange 11.

[0063] The vehicle according to an embodiment of the present invention includes the battery according to any one of the above embodiments.

[0064] The technical advantages of the vehicle according to an embodiment of the present invention are the same as those of the battery in the above embodiments, and will not be elaborated here.

[0065] According to the battery assembly method of an embodiment of the present invention, based on the battery according to any one of the above embodiments, it includes the following steps:

[0066] The winding core 2, the negative electrode current collecting disc 3 and the elastic member 4 are sequentially placed in the housing 1 along a first direction;

[0067] Rolling groove: rolling the peripheral wall of the shell 1 inwardly along the radial direction of the shell 1 to form a third annular groove 111 on the outer peripheral surface of the shell 1, and the part of the shell 1 where the third annular groove 111 is formed presses against the side of the negative electrode collector 3 away from the winding core 2 and compresses the elastic member 4 to deform;

[0068] Squatting sealing: placing the end plate 6 above the portion of the shell 1 where the third annular groove 111 is formed, and the peripheral wall of the shell 1 located above the third annular groove 111 is folded inwardly along the radial direction of the shell 1 to wrap the end plate 6;

[0069] The portion of the housing 1 where the third annular groove 111 is formed is compressed along the first direction until the third annular groove 111 is eliminated.

[0070] According to the battery assembly method of the embodiment of the present invention, after the winding core 2, the negative electrode current collecting disk 3 and the elastic member 4 are placed in the shell 1 in sequence along the first direction, the rolling groove process and the squat sealing process are directly performed to achieve reliable connection between the negative electrode current collecting disk 3 and the shell 1 without laser welding, and the battery assembly yield is high and the cost is low.

[0071] It should be noted that the negative electrode current collector 3 includes a crimping portion 32 and a welding portion 31, and the elastic member 4 includes an O-ring. Placing the winding core 2, the negative electrode current collector 3 and the elastic member 4 in the shell 1 in sequence along the first direction also includes: welding the welding portion 31 to the winding core 2, and placing the O-ring on the crimping portion 32.

[0072] In addition, the portion of the shell 1 where the third annular groove 111 is formed has a first end face and a second end face opposite to each other along a first direction. The first end face is used to abut against the crimping portion 32 of the negative electrode current collecting disc 3 , and the second end face is used to abut against the end plate 6 .

[0073] In some embodiments, the crimping portion 32 includes an annular base plate 321 and an annular pressing plate 322 which are connected to each other. The inner periphery of the annular base plate 321 is connected to the welding portion 31 , and the annular pressing plate 322 is located on a side of the annular base plate 321 away from the winding core 2 .

[0074] The peripheral wall of the shell 1 is rolled inward along the radial direction of the shell 1 to form a third annular groove 111 on the outer peripheral surface of the shell 1. The portion of the shell 1 where the third annular groove 111 is formed is pressed against the side of the negative electrode current collecting disk 3 away from the winding core 2 and compresses the elastic member 4 to deform. It also includes: when the peripheral wall of the shell 1 is deformed, the annular pressure plate 322 is pressed to bend inward along the radial direction of the annular base plate 321, so that the annular pressure plate 322 clamps the O-ring toward the annular base plate 321 and compresses the O-ring to deform.

[0075] That is, the O-ring is placed on the inner peripheral side of the annular pressing plate 322. In the roller groove process, the housing 1 presses the annular pressing plate 322 to fold inward to complete the wrapping of the O-ring. The O-ring realizes reliable support for the annular pressing plate 322, ensuring that the annular pressing plate 322 is in close fit with the first end face.

[0076] It should be noted that the part of the housing 1 where the third annular groove 111 is formed and the part above the third annular groove 111 form the above-mentioned limiting flange 11 after the squat sealing process is completed.

[0077] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0078] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "mounted", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection, or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly defined or limited, a first feature being "on" or "under" a second feature may mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, a first feature being "above", "over" and "on top of" a second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature. A first feature being "under", "below" and "beneath" a second feature may mean that the first feature is directly below or obliquely below the second feature, or merely indicates that the horizontal height of the first feature is less than that of the second feature.

[0081] In the present invention, the terms "an embodiment", "some embodiments", "exemplification", "specific exemplification", or "some exemplifications", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or exemplification are included in at least one embodiment or exemplification of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or exemplification. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or exemplifications. In addition, without contradiction, those skilled in the art may combine and combine the different embodiments or exemplifications described in this specification and the features of different embodiments or exemplifications.

[0082] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions, and variations made by those of ordinary skill in the art to the above embodiments are within the protection scope of the present invention.

Claims

1. A battery, characterized in that, include: A shell, the shell extends along a first direction and defines a receiving cavity, and one end of the shell in the first direction extends radially inwardly of the shell to form a limiting flange; A winding core, the winding core is installed in the accommodating cavity and is spaced apart from the limiting flange; A negative electrode current collector, the negative electrode current collector is arranged in the accommodating cavity and comprises a connected welding portion and a crimping portion, the welding portion is welded to the winding core, and the crimping portion comprises a first limiting surface and a second limiting surface which are arranged at intervals and opposite to each other along the first direction; and An elastic member is sandwiched between the first limiting surface and the second limiting surface, and the crimping portion is sandwiched between the winding core and the limiting flange by compressing the elastic member to deform.

2. The battery according to claim 1, wherein The crimping portion includes a connected annular substrate and an annular pressure plate, the inner circumference of the annular substrate is connected to the welding portion, the annular pressure plate is located on the side of the annular substrate away from the winding core, at least a portion of the annular pressure plate is bent along the radial direction of the annular substrate, and the first limiting surface and the second limiting surface are respectively arranged on the annular pressure plate and the annular substrate.

3. The battery according to claim 2, wherein, The first end of the annular pressure plate is connected to the outer peripheral edge of the annular base plate, at least a portion of the annular pressure plate is bent inwardly along the radial direction of the annular base plate, the second end of the annular pressure plate is spaced apart from the annular base plate in the first direction, a first annular groove is defined between the annular pressure plate and the annular base plate, and the elastic member is fitted in the first annular groove.

4. The battery according to claim 3, characterized in that, The elastic member includes an O-ring, and the O-ring is fitted in the first annular groove.

5. The battery according to claim 2, wherein, The welding portion includes a plurality of welding plates arranged at intervals along the circumferential direction of the annular substrate, the welding plates are connected to the inner circumference of the annular substrate, and all the welding plates jointly define a liquid injection hole.

6. The battery according to claim 5, wherein The welding plates are fan-shaped plates, and a strip-shaped gap extending along the radial direction of the annular base plate is formed between any two adjacent welding plates.

7. The battery according to claim 2, characterized in that, The battery further includes an annular support plate, which is disposed in the accommodating cavity, sleeved on the welding portion and sandwiched between the annular substrate and the winding core.

8. The battery according to claim 7, characterized in that, The annular support plate has a first surface and a second surface opposite to each other along the first direction, an inner circumferential surface of the annular support plate is smoothly connected with each of the first surface and the second surface, and an outer circumferential surface of the annular support plate is smoothly connected with each of the first surface and the second surface.

9. The battery according to claim 1, wherein The limiting flanges are connected end to end along the circumferential direction of the shell, and the inner circumferential surface of the limiting flange is provided with a second annular groove; The battery further includes an end plate, the outer periphery of which is fitted in the second annular groove.

10. A vehicle, characterized in that, Comprising a battery according to any one of claims 1-9.

11. A battery assembly method, characterized in that, The battery according to any one of claims 1 to 9, comprising the following steps: Placing the winding core, the negative electrode current collecting disc and the elastic member in the housing in sequence along a first direction; Rolling the circumferential wall of the shell inwardly along the radial direction of the shell to form a third annular groove on the outer circumferential surface of the shell, and the portion of the shell where the third annular groove is formed presses against the side of the negative electrode collector away from the winding core and compresses the elastic member to deform; The end plate is placed above the portion of the shell body where the third annular groove is formed, and the peripheral wall of the shell body located above the third annular groove is gathered inwardly along the radial direction of the shell body to wrap the end plate; The portion of the shell in which the third annular groove is formed is compressed along the first direction until the third annular groove is eliminated.

12. The battery assembly method according to claim 11, characterized in that, The negative electrode current collector includes a crimping portion and a welding portion, the elastic member includes an O-ring, and placing the winding core, the negative electrode current collector and the elastic member in the housing in sequence along the first direction further includes: The welding part is welded to the winding core and the O-ring is placed on the crimping part.

13. The battery assembly method according to claim 12, characterized in that, The crimping portion comprises a connected annular base plate and an annular pressing plate, the inner circumference of the annular base plate is connected to the welding portion, and the annular pressing plate is located on a side of the annular base plate away from the winding core; The step of rolling the circumferential wall of the shell inwardly along the radial direction of the shell to form a third annular groove on the outer circumferential surface of the shell, wherein the portion of the shell in which the third annular groove is formed presses against a side of the negative electrode current collector away from the winding core and compresses the elastic member to deform further comprises: When the peripheral wall of the shell is deformed, the annular pressing plate is pressed to bend radially inwardly along the annular base plate, so that the annular pressing plate clamps the O-ring toward the annular base plate and presses the O-ring to deform.

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