Single cell and battery pack

Abstract

The application relates to the technical field of batteries, and provides a single battery and a battery pack. According to the single battery provided in the application, the supporting mechanism is arranged in the gap between the side of the bare battery cell and the inner side wall of the shell, the supporting mechanism abuts against the side of the bare battery cell, so that the supporting mechanism can provide a supporting force for the bare battery cell, and at least the situation that the tab is torn when the bare battery cell moves to the side where the original gap is can be avoided. In addition, according to the single battery provided in the application, the supporting mechanism is connected with the shell, that is, fixedly connected to the inner side wall of the shell, so that the supporting mechanism can be assembled together before the bare battery cell is put into the shell, a modular shell structure of the single battery is formed, and the assembly efficiency of the single battery is improved.

Description

Technical Field

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

[0002] Since the successful application of lithium batteries in the 1990s, lithium-ion battery technology has developed rapidly. Lithium-ion batteries, due to their high energy density, long cycle life, and wide operating temperature range, are widely used in consumer electronics, electric vehicles, and energy storage power stations. Based on their casing, lithium-ion batteries can be mainly divided into prismatic aluminum-cased batteries, cylindrical batteries, and pouch batteries. Among them, prismatic aluminum-cased batteries are widely used due to their high cell safety performance, high energy density, high production efficiency, and high production yield.

[0003] In existing aluminum-cased battery cells, when the core is placed inside the aluminum casing, it cannot completely fill the casing; instead, there are gaps between the core and the inner side of the casing. As a result, the core will wobble laterally. This wobble can easily lead to the tearing of the tabs, which poses a safety risk to the battery cell. Utility Model Content

[0004] In view of this, this application provides a single battery cell and a battery pack, with the aim of solving the above-mentioned technical problems to a certain extent.

[0005] A first aspect of this application provides a single-cell battery, the single-cell battery comprising:

[0006] A housing having a cavity;

[0007] A bare battery cell is disposed within the cavity, and a gap exists between the side portion of the bare battery cell and the inner wall of the housing.

[0008] A support mechanism is disposed within the gap, wherein one end of the support mechanism is fixedly connected to the inner side wall of the housing, and the other end abuts against the side of the bare battery cell.

[0009] Based on the above technical solutions, optionally, the bare battery cell has a first predetermined direction and a second predetermined direction that are perpendicular to each other, the side of the bare battery cell includes a first part and a second part that are opposite to each other in the predetermined direction, the inner sidewall of the housing includes a first sidewall and a second sidewall arranged in the predetermined direction, and there are gaps between the first part and the first sidewall and between the second part and the second sidewall.

[0010] The single cell has multiple support mechanisms, with the support mechanism located on the side where the first sidewall is located welded to the first sidewall, and the support mechanism located on the side where the second sidewall is located welded to the second sidewall.

[0011] Based on any of the above technical solutions, optionally, the number of bare cells is multiple, arranged along the second predetermined direction, each bare cell has gaps on both sides of the first predetermined direction, and each gap is provided with a support mechanism, so that the number of support mechanisms is twice that of the bare cells;

[0012] The two support mechanisms located on either side of the bare cell in the first predetermined direction are mirror images of each other in the first predetermined direction.

[0013] Optionally, based on any of the above technical solutions, the support mechanism includes:

[0014] A pad member abuts against the side of the corresponding bare battery cell;

[0015] An elastic member, one side of which abuts against the side of the pad member opposite to the bare cell, and the other side of which is welded to the inner wall of the housing, wherein the elastic member is compressed between the pad member and the inner wall of the housing.

[0016] Based on any of the above technical solutions, optionally, the bare battery cell is a wound core, and both the first part and the second part are curved sides; the side of the pad member facing the curved side is an arc surface.

[0017] Based on any of the above technical solutions, optionally, the single cell has a height direction, and both the first predetermined direction and the second predetermined direction are perpendicular to the height direction;

[0018] In the support mechanism, the pad member has a plurality of pad portions spaced apart in the height direction, each pad portion abutting against the side of the bare battery cell. The elastic member has a plurality of elastic portions corresponding one-to-one with the plurality of pad portions. Each elastic portion is compressed between the corresponding pad portion and the inner wall of the housing, and each elastic portion is welded to the inner wall of the housing.

[0019] Based on any of the above technical solutions, optionally, the single cell has a height direction, and both the first predetermined direction and the second predetermined direction are perpendicular to the height direction;

[0020] In the support mechanism, the dimension of the pad member in the height direction is greater than half the dimension of the bare cell in the height direction, and the elastic member has a plurality of elastic parts spaced apart in the height direction. Each elastic part is compressed between the corresponding pad member and the inner wall of the housing, and each elastic part is welded to the inner wall of the housing.

[0021] Based on any of the above technical solutions, optionally, the single cell has a height direction, the single cell has a top and a bottom opposite each other in the height direction, the first predetermined direction and the second predetermined direction are both perpendicular to the height direction, and the pad member has a guide slope on the side near the top in the height direction;

[0022] The guide ramp has a first side and a second side opposite to each other in the first predetermined direction, the second side being closer to the bare cell than the first side, and the first side being higher than the second side, for guiding the bare cell toward the side of the pad member opposite to the elastic member.

[0023] Based on any of the above technical solutions, the inner sidewall of the housing may optionally include a sidewall body and a connecting structure disposed on the sidewall body, the connecting structure having a connecting surface, and the elastic member being welded to the connecting surface;

[0024] The connecting structure is a protruding structure protruding from the sidewall body, and the connecting surface is the outer surface of the protruding structure; or the connecting structure is a recessed portion on the sidewall body, and the connecting surface is the inner surface of the recessed portion.

[0025] A second aspect of this application provides a battery pack comprising individual batteries as described above.

[0026] Thus, according to the single cell provided in this application, since the support mechanism is disposed in the gap between the side of the bare cell and the inner wall of the casing, the support mechanism abuts against the side of the bare cell, so that the support mechanism can provide support force for the bare cell, at least to avoid the situation of the tab tearing caused when the bare cell moves towards the side where the original gap is located.

[0027] Furthermore, according to the single cell provided in this application, the support mechanism is fixedly connected to the housing, that is, connected to the inner wall of the housing. Thus, the support mechanism can be assembled before the bare cell is inserted into the housing to form a modular housing structure for the single cell, which is beneficial to improving the assembly efficiency of the single cell.

[0028] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0029] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram showing a cross-sectional view of a single cell provided according to an embodiment of this application, taken perpendicular to the height direction.

[0031] Figure 2 It shows Figure 1 A schematic diagram of the enlarged view at point A in the middle.

[0032] Figure 3 A schematic plan view of the internal structure of a first example of a single-cell battery provided according to an embodiment of this application is shown.

[0033] Figure 4 A schematic plan view of the internal structure of a second example of a single-cell battery provided according to an embodiment of this application is shown.

[0034] Figure 5 A schematic diagram showing a three-dimensional view of a single cell provided according to an embodiment of this application is shown.

[0035] Figure label:

[0036] 100 - Housing; 110 - Cavity; 111 - Gap; 112 - First sidewall; 113 - Second sidewall;

[0037] 200 - Bare cell; 210 - First part; 220 - Second part; 230 - Curved side;

[0038] 300 - Support mechanism; 320 - Pad member; 321 - Pad portion; 330 - Elastic member; 331 - Elastic part; X - First predetermined direction; Y - Second predetermined direction; Z - Height direction;

[0039] 400 - pole; 500 - explosion-proof valve; 600 - injection port. Detailed Implementation

[0040] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and 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. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0044] According to a first aspect of the embodiments of this application, a single-cell battery is provided, which will be described below in conjunction with... Figures 1 to 5 A detailed description of the structure and working principle of a single battery cell.

[0045] The first aspect of this application provides a single-cell battery, which includes a housing 100, a bare cell 200, and a support mechanism 300. In an embodiment, the housing 100 has a cavity 110, the bare cell 200 is disposed in the cavity 110, and a gap 111 is formed between the side of the bare cell 200 and the inner sidewall of the housing 100.

[0046] In this embodiment, the support mechanism 300 is disposed within the gap 111, wherein one end of the support mechanism 300 is fixedly connected to the inner sidewall of the housing 100, and the other end abuts against the side of the bare battery cell 200.

[0047] Thus, in the single battery provided according to the embodiments of this application, since the support mechanism 300 is disposed in the gap 111 between the side of the bare cell 200 and the inner sidewall of the housing 100, and the support mechanism 300 abuts against the side of the bare cell 200, the support mechanism 300 can provide support force to the bare cell 200, and at least can avoid the situation of the tab tearing caused when the bare cell 200 moves towards the side where the original gap 111 is located.

[0048] Furthermore, according to the single battery provided in the embodiments of this application, one end of the support mechanism 300 is fixedly connected to the housing 100, that is, connected to the inner side wall of the housing 100. Thus, the support mechanism 300 can be assembled together before the bare cell 200 is inserted into the housing to form a modular housing 100 structure of the single battery, which is beneficial to improving the assembly efficiency of the single battery.

[0049] In the embodiments, the support mechanism 300 mentioned above does not specifically refer to the support mechanism being formed as a columnar or strip-shaped structure with two ends. In fact, as described above, it is intended to characterize the support mechanism 300 having two parts that are fixedly connected to the inner wall of the housing 100 and abut against the outer side of the bare battery cell 200.

[0050] In an embodiment, as an example, the bare cell 200 may be, for example, a wound core. The housing 100 may be, for example, a square shell, that is, a cuboid-shaped housing 100, and the material of the housing 100 may be, for example, aluminum, that is, the housing 100 is formed as a substantially aluminum shell.

[0051] In this embodiment, the side of the bare cell 200 is abutted by the support mechanism 300. Therefore, the support mechanism 300 provides support for the side of the bare cell 200. This support can prevent the bare cell 200 from moving toward the side where the support mechanism 300 is located, or can reduce the extent of the bare cell 200 moving toward the support mechanism 300, thereby reducing the risk of the tab being torn.

[0052] In an embodiment, the support mechanism 300 may include a support structure with multiple cavities or holes inside. These cavities or holes can be further compressed. The support structure is compressed within the gap 111 by a certain amount of compression, so that it can provide support force by relying on the already compressed amount of compression, and can also absorb the amount of movement of the bare cell 200 toward the inner wall of the housing 100 by means of the compression amount that can still be further compressed.

[0053] In other examples, the support mechanism 300 may also include a resilient structure, such as employing a spring, for example, an elastic gasket, as provided in the embodiments of this application. Figures 1 to 4 The examples in the text are all examples of support mechanisms 300 including elastic pads, which will be described in detail in the following description.

[0054] In the embodiments, the support mechanism 300 can be connected to the inner wall of the housing 100 in various ways, such as using common fixed connection methods. For example, when the structure of the support mechanism 300 facing the inner wall of the housing 100 is also a metal structure, it can be connected to the inner wall of the housing 100 by welding. In other examples, structural adhesive can also be used to connect the support mechanism 300 and the inner wall of the housing 100.

[0055] In an embodiment, the inner sidewall of the housing 100 further includes a connecting structure (not shown in the figure) disposed on the sidewall body and disposed on the sidewall body. The connecting structure has a connecting surface, and the elastic structure described above can be welded to the connecting surface.

[0056] In this embodiment, by providing a connecting structure, a larger contact area is provided for welding the elastic structure described above, namely the elastic member 330 mentioned below. Specifically, the connecting structure can be a protrusion protruding from the sidewall body, and the connecting surface can be the outer surface of the protrusion, to which the elastic member 330 can be welded or bonded. Alternatively, in other examples, the connecting structure can be a recessed portion on the sidewall body, such as a groove, and the connecting surface can be the inner surface of the recess, to which the elastic member 330 can be welded or bonded.

[0057] Combination Figure 1 and Figure 2 According to the single-cell battery provided in the embodiments of this application, optionally, the bare cell 200 may have a first predetermined direction X and a second predetermined direction Y that are perpendicular to each other. The side of the bare cell 200 may include a first portion 210 and a second portion 220 that are opposite to each other in the first predetermined direction X. The inner sidewall of the casing 100 may include a first sidewall 112 and a second sidewall 113 arranged in the first predetermined direction X. There may be a gap 111 between the first portion 210 and the first sidewall 112, and between the second portion 220 and the second sidewall 113. In the embodiments, the single-cell battery may have a plurality of support mechanisms 300. The support mechanism 300 disposed on the side where the first sidewall 112 is located may be welded to the first sidewall 112, and the support mechanism 300 disposed on the side where the second sidewall 113 is located may be welded to the second sidewall 113.

[0058] It should be noted that the first sidewall 112 and the second sidewall 113 described above can both have the connection structure and sidewall body mentioned above, so as to be welded or bonded to the elastic member 330 in the corresponding support mechanism 300.

[0059] Based on the above example, in the embodiment, the bare cell 200 has a first predetermined direction X, such as... Figure 1As shown, this can be, for example, the length direction of the housing 100. In an embodiment, the second predetermined direction Y of the bare cell 200 can be the width direction of the housing 100. Figure 1 The diagram shown is from a top-down view, that is, along the height direction Z of a single cell, showing a first predetermined direction X and a second predetermined direction Y that are perpendicular to each other.

[0060] In other words, the first part 210 of the bare cell 200 can be, for example, as Figure 1 The left-hand portion, the second portion 220, can be, for example, as... Figure 1 The right-hand portion of the housing 100, correspondingly, the first sidewall 112 of the housing 100 can be, for example, a... Figure 1 The left side wall and the second side wall 113 can be, for example, the left side wall. Figure 1 The right side wall. See also... Figure 1 There is a gap 111 between the left portion and the left side wall, and there is also a gap 111 between the right portion and the right side wall. For each bare cell 200, a support mechanism 300 is provided in the gap 111 on the left and the gap 111 on the right.

[0061] Optionally, the support mechanism 300 can be elastically compressed within the corresponding gap 111 of the single-cell battery provided in the embodiments of this application. As mentioned above, the elastically compressed support mechanism 300 can provide sufficient support force for the bare cell 200, thereby effectively limiting the swaying of the bare cell 200 along the first predetermined direction X as described above. This elastic compression can be achieved, for example, by compressing the elastic pads included in the support mechanism 300.

[0062] According to the single battery provided in the embodiments of this application, optionally, the number of bare cells 200 is multiple (two are shown in the example in the figure, but three, four or even more are also possible), arranged along the second predetermined direction Y, and each bare cell 200 has the aforementioned gap 111 on both sides in the first predetermined direction X. In other words, taking the first sidewall 112 of the casing 100 as an example, the first sidewall 112 and the first part 210 of each bare cell 200 have the aforementioned gap 111, that is, if there are two bare cells 200, there are two gaps 111 on the side where the first sidewall 112 is located, if there are three bare cells, there are three gaps 111 on the side where the first sidewall is located, and so on.

[0063] Therefore, since a bare cell 200 has gaps 111 on both sides in the first predetermined direction X, and a support mechanism 300 is provided in each gap 111, the number of support mechanisms 300 is always twice the number of bare cells 200.

[0064] In the embodiment, two support mechanisms 300 located on both sides of the same bare cell 200 in the first predetermined direction X are mirror images of each other in the first predetermined direction X (i.e. mirror images of the plane of symmetry of the single cell perpendicular to the first predetermined direction X), thereby ensuring that the bare cell 200 is balanced by forces and has a stable posture.

[0065] According to the single-cell battery provided in the embodiments of this application, the support mechanism 300 may optionally include a pad member 320 and an elastic member 330. In the embodiments, the pad member 320 may abut against the side of the corresponding bare cell 200, one side of the elastic member 330 may abut against the side of the pad member 320 opposite to the bare cell 200, and the other side of the elastic member 330 may be welded to the inner wall of the housing 100.

[0066] In an embodiment, the elastic member 330 can be compressed between the pad member 320 and the inner sidewall of the housing 100. That is, the elastic member 330 can be, for example, the elastic pad mentioned above, and the pad member 320 can be used to directly abut against the side of the bare cell 200.

[0067] According to the single-cell battery provided in the embodiments of this application, optionally, as mentioned above, the bare cell 200 can be a wound core, and the first part 210 and the second part 220 can both be curved side portions 230. In the embodiments, the side of the pad member 320 facing the curved side portion 230 is an arc surface. By using the arc surface to cover the curved side portion 230, the electrode sheet at the corner of the wound core can be tightly wrapped. Specifically, it can ensure the effective fit between the pad member 320 and the curved side portion 230, thereby making the electrode sheet at the corner of the wound core more tightly wrapped, effectively preventing purple spots or lithium plating at the corner, improving the cell safety performance, and also extending the cell life.

[0068] According to the embodiments of this application, such as the single battery cell, Figure 4 As shown, in the support mechanism 300, the pad member 320 may have a plurality of pad portions 321 spaced apart in the height direction Z (two are shown in the figure, but there may also be three, three, five or more). Each pad portion 321 can abut against the side of the bare cell 200. The elastic member 330 may have a plurality of elastic portions 331 corresponding one-to-one with the aforementioned plurality of pad portions 321. Each elastic portion 331 can be compressed between the corresponding pad portion 321 and the inner sidewall of the housing 100. Each elastic portion 331 is welded to the inner sidewall of the housing 100.

[0069] In the embodiment, as described above, the pad member 320 may be segmented in the height direction Z. Each segment may be, for example, a pad portion 321 as described above. Each pad portion 321 may have a corresponding elastic portion 331 as an elastic support. Here, the elastic portion 331 is an elastic pad mentioned in the above description. The pad portion 321 may also be formed of an aluminum sheet, for example. Therefore, the two ends of the elastic pad may be welded to the pad portion 321 and the inner sidewall of the housing 100, respectively.

[0070] According to the single-cell battery provided in the embodiments of this application, optionally, for each pad portion 321, the side facing the curved side portion 230 is an arc surface. The technical effects here are the same as those described above, and will not be repeated here.

[0071] In contrast, Figure 3 In the given example, in the support mechanism, the pad member 320 can have a dimension in the height direction Z that is greater than half the dimension in the height direction Z of the bare cell 200, and one pad member 320 can be provided for only one gap 111 on one side of the bare cell 200. The elastic member 330 can have a plurality of elastic portions 331 spaced apart in the height direction Z. Figure 2 The diagram shows two elastic portions 331 (but there could be three, four, five, or even more). Each elastic portion 331 is compressed between the corresponding pad member 320 and the inner wall of the housing 100. Each elastic portion 331 is welded to the inner wall of the housing 100. The pad member 320 can also be formed of aluminum sheet, and the elastic portions 331 can also be welded to the pad member 320. Here, the elastic portion 331 can still be, for example, an elastic pad, i.e., an elastic structure formed by reciprocating stacking of sheet-like structures.

[0072] In the embodiments, the material of the pad member 320 and the above pad portion 321 can be any material that is insoluble in the electrolyte, including but not limited to polytetrafluoroethylene, carbon fiber, rubber, polymethyl methacrylate or aluminum sheet.

[0073] In the embodiments, the elastic gasket may be made of metal, or it may be a spring structure, such as a helical spring structure, or other elastic structures.

[0074] In one embodiment, the pad member 320 has a guide ramp (not shown) on the side of the pad member 320 near the top of the single cell in the height direction Z (i.e., the upper side of the pad member 320). The guide ramp may have a first side and a second side opposite each other in a first predetermined direction X, with the second side closer to the bare cell 200 relative to the first side, and the first side higher than the second side. This is to guide the bare cell 200 toward the side of the pad member 320 opposite to the elastic member 330, particularly facilitating the placement of the bare cell 200, i.e., the core, between the two mirror-arranged support mechanisms 300.

[0075] It should be noted that, in Figure 3 In the example, the guide ramp can be set on the upper side of the pad member 320, in Figure 4 In the example, the guide ramp can be provided on the upper side of the uppermost pad portion included in the pad member 320.

[0076] In the embodiments, Figure 3 Based on the example, both the pad component 320 and the elastic gasket described above can be made of aluminum. The thickness of the pad component 320 can be, for example, 0.5 mm, with a total length in the arc direction of 25 mm and an arc of 2 rad. The total length of the pad component 320 in the height direction Z can be 140 mm. The elastic gasket can be a spring structure with a total length of 5 mm. The pad component 320 and the elastic gasket can be welded together. One pad component 320 requires two elastic gaskets to be welded in the height direction Z. The elastic gaskets and the aluminum shell can be welded together.

[0077] In the embodiments, in Figure 4 Based on the example, both the pad member 320 and the elastic gasket described above can be made of aluminum. The thickness of the pad member 320 can be, for example, 0.5 mm, with a total length in the arc direction of 25 mm and an arc of 2 rad. The pad member 320 has two pad portions, each with a total length of 20 mm in the height direction Z. The elastic gasket can also be a spring structure with a total length of 5 mm. One pad portion and one elastic gasket are welded together. For a support mechanism 300, the number of pad portions and elastic gaskets can both be two.

[0078] According to the single-cell battery provided in the embodiments of this application, the pad member 320, the elastic member 330, and the casing 100 are formed as a whole. The elastic member 330 reduces the lateral shaking of the core and prevents the tabs from tearing due to shaking, thereby improving the safety performance of the cell. Because the lateral shaking of the core is reduced, the safety factor is improved, and the overhang of the core (the amount of protrusion, which refers to the part of the negative electrode sheet that extends beyond the positive and negative electrode sheets in the length and width directions) can be appropriately reduced, thereby increasing the energy density of the core.

[0079] Furthermore, the presence of padding member 320 and elastic member 330 allows the corners of the core to be directly connected to the aluminum shell, making it easier for the heat from the core to be conducted to the aluminum shell, which is beneficial for heat dissipation of the battery cell.

[0080] like Figure 5 As shown, Figure 5 A schematic diagram showing a three-dimensional view of the complete external structure of a single battery cell according to an embodiment of this application is provided. Figure 5The housing 100 as described above is shown, as well as the two terminals 400 on the top of the single cell, namely the positive terminal and the negative terminal, and the explosion-proof valve 500 and the liquid injection port 600.

[0081] A second aspect of this application provides a battery pack comprising the aforementioned individual cells, such as multiple individual cells arranged in a module, which also possesses the aforementioned beneficial effects, which will not be elaborated further here. In embodiments, the battery pack provided according to the embodiments of this application can be applied in new energy vehicles to provide power for the driving of new energy vehicles, either wholly or partially.

[0082] The above are merely preferred embodiments of this application and do not limit the scope of protection of this application. Any equivalent structural transformations made based on the innovative concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the scope of protection of this application.

Claims

1. A single-cell battery, characterized in that, The single battery cell includes: A housing (100) having a cavity (110); A bare battery cell (200) is disposed in the cavity (110), and there is a gap (111) between the side of the bare battery cell (200) and the inner wall of the housing (100); A support mechanism (300) is disposed within the gap (111), wherein one end of the support mechanism (300) is fixedly connected to the inner wall of the housing (100), and the other end abuts against the side of the bare battery cell (200).

2. The single-cell battery according to claim 1, characterized in that, The bare cell (200) has a first predetermined direction (X) and a second predetermined direction (Y) that are perpendicular to each other. The side of the bare cell (200) includes a first part (210) and a second part (220) that are opposite to each other in the first predetermined direction (X). The inner sidewall of the housing (100) includes a first sidewall (112) and a second sidewall (113) arranged in the first predetermined direction (X). The gap (111) is present between the first part (210) and the first sidewall (112) and between the second part (220) and the second sidewall (113). The single cell has multiple support mechanisms (300), the support mechanism (300) located on the side of the first sidewall (112) is welded to the first sidewall (112), and the support mechanism (300) located on the side of the second sidewall (113) is welded to the second sidewall (113).

3. The single-cell battery according to claim 2, characterized in that, The number of bare cells (200) is multiple, arranged along the second predetermined direction (Y), and each bare cell (200) has a gap (111) on both sides in the first predetermined direction (X). Each gap (111) is provided with a support mechanism (300), such that the number of support mechanisms (300) is twice that of the bare cells (200). Among them, the two support mechanisms (300) located on both sides of the bare cell (200) in the first predetermined direction (X) are mirror images of each other in the first predetermined direction (X).

4. The single-cell battery according to claim 2, characterized in that, The support mechanism (300) includes: A pad member (320) abuts against the side of the corresponding bare cell (200); An elastic member (330) is provided, one side of which abuts against the side of the pad member (320) opposite to the bare cell (200), and the other side of which is welded to the inner wall of the housing (100). The elastic member (330) is compressed between the pad member (320) and the inner wall of the housing (100).

5. The single-cell battery according to claim 4, characterized in that, The bare battery cell (200) is a wound core, and the first part (210) and the second part (220) are both curved side portions (230); the side of the pad member (320) facing the curved side portion (230) and the side of the curved side portion (230) are arc surfaces.

6. The single-cell battery according to claim 4, characterized in that, The single cell has a height direction (Z), and the first predetermined direction (X) and the second predetermined direction (Y) are both perpendicular to the height direction (Z); In the support mechanism (300), the pad member (320) has a plurality of pad portions (321) spaced apart in the height direction (Z), each pad portion (321) abutting against the side of the bare battery cell (200), and the elastic member (330) has a plurality of elastic portions (331) corresponding one-to-one with the plurality of pad portions (321), each elastic portion (331) being compressed between the corresponding pad portion (321) and the inner sidewall of the housing (100), and each elastic portion (331) being welded to the inner sidewall of the housing.

7. The single-cell battery according to claim 4, characterized in that, The single cell has a height direction (Z), and the first predetermined direction (X) and the second predetermined direction (Y) are both perpendicular to the height direction (Z); In the support mechanism (300), the dimension of the pad member (320) in the height direction (Z) is greater than half the dimension of the bare cell (200) in the height direction (Z). The elastic member (330) has a plurality of elastic portions (331) spaced apart in the height direction (Z). Each elastic portion (331) is compressed between the corresponding pad member (320) and the inner wall of the housing (100). Each elastic portion (331) is welded to the inner wall of the housing.

8. The single-cell battery according to claim 4, characterized in that, The single cell has a height direction (Z), the single cell has a top and a bottom opposite each other in the height direction (Z), the first predetermined direction (X) and the second predetermined direction (Y) are both perpendicular to the height direction (Z), and the pad member (320) has a guide slope on the side of the pad member (320) near the top in the height direction (Z). The guide ramp has a first side and a second side opposite each other in the first predetermined direction (X), the second side being closer to the bare cell (200) relative to the first side, and the first side being higher than the second side, for guiding the bare cell (200) toward the side of the pad member (320) opposite to the elastic member (330).

9. The single-cell battery according to claim 4, characterized in that, The inner sidewall of the housing (100) further includes a sidewall body and a connecting structure disposed on the sidewall body, the connecting structure having a connecting surface, and the elastic member (330) being welded to the connecting surface; The connecting structure is a protruding structure protruding from the sidewall body, and the connecting surface is the outer surface of the protruding structure; or the connecting structure is a recessed portion on the sidewall body, and the connecting surface is the inner surface of the recessed portion.

10. A battery pack, characterized in that, The battery pack comprises individual cells as described in any one of claims 1 to 9.

Images