Single battery, battery pack and energy storage system

Abstract

The utility model provides a single battery, a battery pack and an energy storage system. The single battery comprises a shell and a battery cell arranged in the shell, a supporting piece is arranged between at least one inner wall of the shell and the battery cell, the supporting piece is an insulating supporting piece, and at least part of the surface, facing the battery cell, of the supporting piece abuts against at least part of the surface of the battery cell. By arranging the supporting piece, the problem of local stress concentration between the battery cell and the shell can be reduced, so that the lithium separation probability is reduced, and the cycle performance of the battery cell is improved.

Description

Technical Field

[0001] The present application relates to the technical field of lithium batteries, and in particular to a single cell, a battery pack and an energy storage system. Background Art

[0002] In lithium batteries, when the surface of the battery cell is subjected to different pressures, lithium deposition is prone to occur at the stress concentration location. In actual use, the battery cell in the lithium battery and the shell used to encapsulate the battery cell often generate mutual squeezing force due to the battery cell expansion caused by the charge and discharge cycle or the lithium battery being placed on its side. The shell exerts different forces on different parts of the battery cell, which causes certain parts of the battery cell, especially the corners of the battery cell, to have excessive stress concentration, which leads to lithium deposition. The lithium metal layer or dendrites formed by lithium deposition can easily cause a short circuit between the battery cell and the shell, thereby affecting the cycle performance of the lithium battery and reducing its service life. Utility Model Content

[0003] The present application provides a single cell, a battery pack and an energy storage system, which can reduce the problem of local stress concentration between the battery cell and the shell, so as to reduce the probability of metal accumulation or dendrite formation and improve the cycle performance of the battery cell.

[0004] In a first aspect, the present application provides a single cell battery, comprising a shell and a battery cell arranged in the shell; a support member is provided between at least one inner wall of the shell and the battery cell, the support member is an insulating support member, at least a portion of the surface of the support member facing the battery cell abuts against a portion of the surface of the battery cell facing the support member, and the surface of the support member abutting against the battery cell is a curved surface.

[0005] The single cell battery of the present application can support the cell by adding a support member with insulating properties between the cell and the shell, so as to prevent the cell from being excessively tilted and causing the corners of the cell to abut against the shell. Part of the surface of the support member facing the cell abuts against part of the surface of the cell, so that a certain reserved space can be reserved between the corners of the cell and the shell, so that the cell expands during the charging and discharging process to reduce the probability of contact with the shell, thereby reducing the risk of lithium plating and improving the cycle life of the battery. The support member abuts against the cell through the curved surface, and part of the curved surface is in contact with the cell, while part of the curved surface is separated from the cell. Thus, a certain gap can be formed between the support member and the cell, which will not hinder the circulation of the electrolyte and ensure the normal charging and discharging function of the single cell.

[0006] In an optional implementation, the support member is an elastic support member. Since the support member is an elastic support member, when the battery cell applies extrusion stress to the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion, avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell, and further reducing the possibility of short circuit between the battery cell and the shell.

[0007] In an optional implementation, at least part of the surface of the support member facing the shell is connected to the inner wall of the shell. Exemplarily, the support member abuts or bonds to the inner wall of the shell. The support member and the shell are fixedly connected by abutment or bonding.

[0008] In an optional implementation, the shell is a rectangular parallelepiped, and the support members are respectively provided between at least two opposite inner walls of the shell and the battery cell. Support members are provided between at least two opposite inner walls and the battery cell, and the number of support members is at least two, wherein two support members are arranged opposite to each other, and the battery cell is sandwiched between the two oppositely arranged support members, so that the battery cell is separated from the shell in at least two planes, and the battery cell is prevented from being squeezed by the shell.

[0009] In an optional implementation, the battery cell is a stacked core, which includes stacked and alternating positive and negative electrode sheets; along the arrangement direction of the positive and negative electrode sheets, the support member is arranged between the inner wall of the shell and the battery cell. Since the corners of the stacked core expand greatly during the charging and discharging process, it is easy to be squeezed and lithium deposition occurs. In this structure, by arranging support members between the battery cell and the shell in the arrangement direction of the electrode sheets, on the one hand, the battery cell can be fixed and clamped to prevent the stacked core from tilting excessively. On the other hand, the corners of the battery cell can always maintain a certain distance from the shell when the battery cell is placed upright, avoiding contact between the corners of the battery cell and the shell, and at the same time, the support member can be used to disperse stress to avoid lithium deposition due to stress concentration at the corners.

[0010] In an optional implementation, the curved surface is a convex curved surface protruding from one side of the inner wall of the shell to the direction of the battery core, and the convex curved surface abuts against the battery core. The convex curved surface of the support member can make the support member abut against the middle area of ​​the stacked core, and the edge part of the stacked core is separated from the stacked core to form a gap, which can reserve expansion space for the edge of the stacked core.

[0011] In an optional implementation, the thickness of the support member gradually decreases from the geometric center of the convex surface to the edge of the convex surface. The surface where the support member is connected to the shell can be a plane to facilitate fixed connection with the shell. The middle area of ​​the support member is relatively thick, forming a bulge, which abuts against the stacked core and supports the stacked core. The edge portion is relatively thin and separated from the stacked core. During the charge and discharge cycle of the stacked core, the corners of the stacked core expand greatly. This structural setting can form a gap between the corners of the stacked core and the shell to reserve expansion space for the corners of the stacked core and avoid direct compression between the corners of the stacked core and the support member.

[0012] In an optional implementation, the support member is in a spherical crown structure, which facilitates the processing and installation of the support member and can make the stress of the stacked core more uniform.

[0013] In an optional implementation, the support member includes a plurality of abutment columns, and along the arrangement direction of the positive electrode sheet and the negative electrode sheet, one end of each of the plurality of abutment columns facing the battery cell abuts the battery cell. The support member abuts the battery cell through the plurality of abutment columns, which can achieve dispersed abutment between the support member and the battery cell, and can make the corners of the battery cell suspended to reserve expansion space. At the same time, the plurality of abutment columns are arranged at intervals, which can facilitate the circulation of the electrolyte.

[0014] In an optional implementation, one end of the abutment column facing away from the battery core is connected to the inner wall of the shell to achieve fixation of multiple abutment columns.

[0015] In another optional implementation, the support member further includes a first connecting plate, the first connecting plate is connected to the inner wall of the shell, and the end of the abutment column facing away from the battery cell is connected to the connecting plate. By providing the first connecting plate, the plurality of abutment columns are integrally formed, which facilitates the fixation between the plurality of abutment columns and the inner wall of the shell and facilitates installation.

[0016] In another optional implementation, in a direction perpendicular to the arrangement direction of the positive electrode sheet and the negative electrode sheet, another support is provided between the two side walls of the shell and the battery cell, and a groove is provided on the side of the other support facing the battery cell, and the end of the battery cell is inserted into the groove, and a gap is left between the outer circumference of the battery cell and the groove. The end of the battery cell is inserted into the groove, which can prevent the battery cell from tilting and colliding with the shell during side placement.

[0017] In an optional implementation, a single cell includes a shell and a battery cell disposed in the shell; wherein the battery cell is a stacked core, including positive and negative electrode sheets alternately stacked; along the arrangement direction of the positive and negative electrode sheets, a support member is provided between the inner wall of the shell and the battery cell, the support member is an insulating support member, at least a portion of the surface of the support member facing the shell is connected to at least a portion of the surface of the inner wall of the shell, and at least a portion of the surface of the support member facing the battery cell abuts against a portion of the surface of the battery cell. The surface of the support member abutting against the battery cell is a curved surface.

[0018] In an optional implementation, the support member is abutted against or bonded to the inner wall of the shell, and the support member and the shell are fixedly connected by abutting or bonding.

[0019] In an optional implementation, the support member is an elastic support member. Since the support member is an elastic support member, when the battery cell applies extrusion stress to the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion, avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell, and further reducing the possibility of short circuit between the battery cell and the shell.

[0020] In an optional implementation, the shell is a rectangular parallelepiped, and the support members are respectively provided between at least two opposite inner walls of the shell and the battery cell. Support members are provided between at least two opposite inner walls and the battery cell, and the number of support members is at least two, wherein two support members are arranged opposite to each other, and the battery cell is sandwiched between the two oppositely arranged support members, so that the battery cell is separated from the shell in at least two planes, and the battery cell is prevented from being squeezed by the shell.

[0021] In an optional implementation, the curved surface is a convex curved surface protruding from one side of the inner wall of the shell to the direction of the battery core, and part of the surface of the convex curved surface abuts against the battery core. The convex curved surface of the support member can make the support member abut against the middle area of ​​the stacked core, and the edge part of the stacked core is separated from the stacked core to form a gap, which can reserve expansion space for the edge of the stacked core.

[0022] In an optional implementation, the thickness of the support member gradually decreases from the geometric center of the convex surface to the edge of the convex surface. The surface where the support member is connected to the shell can be a plane to facilitate fixed connection with the shell. The middle area of ​​the support member is relatively thick, forming a bulge, which abuts against the stacked core and supports the stacked core. The edge portion is relatively thin and separated from the stacked core. During the charge and discharge cycle of the stacked core, the corners of the stacked core expand greatly. This structural setting can form a gap between the corners of the stacked core and the shell to reserve expansion space for the corners of the stacked core and avoid direct compression between the corners of the stacked core and the support member.

[0023] In an optional implementation, the support member is in a spherical crown structure, which facilitates the processing and installation of the support member and can make the stress of the stacked core more uniform.

[0024] In an optional implementation, the support member includes a plurality of abutment columns, and along the arrangement direction of the positive electrode sheet and the negative electrode sheet, one end of each of the plurality of abutment columns facing the battery cell abuts the battery cell. The support member abuts the battery cell through the plurality of abutment columns, which can achieve dispersed abutment between the support member and the battery cell, and can make the corners of the battery cell suspended to reserve expansion space. At the same time, the plurality of abutment columns are arranged at intervals, which can facilitate the circulation of the electrolyte.

[0025] In an optional implementation, one end of the abutment column facing away from the battery core is connected to the inner wall of the shell to achieve fixation of multiple abutment columns.

[0026] In an optional implementation, the support member further includes a first connecting plate, the first connecting plate is connected to the inner wall of the shell, and the end of the abutment column facing away from the battery cell is connected to the first connecting plate. By providing the first connecting plate, the plurality of abutment columns are integrally formed, which facilitates the fixation between the plurality of abutment columns and the inner wall of the shell and facilitates installation.

[0027] By adding a support member with elastic and insulating properties between the stacked core and the shell, the two sides of the support member can be respectively in contact with the stacked core and the shell, which can support the stacked core and prevent the stacked core from tilting. In addition, since the support member is an elastic support member, when the battery cell applies extrusion stress to the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion and avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell and the possibility of short circuit between the battery cell and the shell. In addition, the surface where the support member abuts against the stacked core is a curved surface, so that a gap is formed between the stacked core and the support member, which will not hinder the circulation of the electrolyte and ensure the normal charging and discharging function of the single battery.

[0028] In an optional implementation, the battery core is a roll core, and the peripheral side surface of the roll core includes two oppositely arranged flat surfaces and two oppositely arranged curved surfaces, and the support member is provided between the curved surface and the inner wall of the shell along the direction in which the two curved surfaces of the same roll core are oppositely arranged. By adding a support member with elastic and insulating properties between the roll core and the shell, effective support for the roll core can be achieved to prevent the roll core from tilting when placed on its side so that the corner contacts the shell; and, since the support member is an elastic support member, when the battery cell applies extrusion stress to the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion, avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell, thereby reducing the possibility of short circuit between the battery cell and the shell, and increasing battery life.

[0029] In an optional implementation, the surface of the support member abutting against the battery cell is a curved surface. The support member abuts against the battery cell via the curved surface, and in the abutting structure, part of the curved surface is in contact with the battery cell, and part of the curved surface is separated from the battery cell, thereby forming a certain gap between the support member and the battery cell, which will not hinder the flow of electrolyte and ensure the normal charging and discharging function of the single battery.

[0030] In an optional implementation, the curved surface is a concave curved surface that is concave from the battery core to the inner wall of the shell, and at least part of the surface of the concave curved surface abuts against the curved surface. The concave curved surface abuts against the curved surface of the winding core, so that the curved surface of the winding core is confined within the concave curved surface, thereby achieving a positioning and supporting effect on the winding core.

[0031] In an optional implementation, there are two winding cores, and the surface of the support member facing the battery core includes two concave surfaces, each of which abuts against the curved surface of each winding core. The concave surface of each support member cooperates with the curved surface of each winding core to support and fix each winding core, thereby preventing multiple winding cores from tilting excessively.

[0032] In an optional implementation, a second connecting plate is provided between the two winding cores, and the second connecting plate is respectively connected to the supporting members on both sides of the battery core. The second connecting plate can separate the two winding cores to prevent the two winding cores from being tilted and squeezed.

[0033] In an optional implementation, a single cell includes a shell and a battery cell disposed in the shell. The battery cell is a winding core, and the peripheral side surface of the winding core includes two oppositely arranged straight surfaces and two oppositely arranged curved surfaces. Along the direction in which the two curved surfaces are oppositely arranged, a support member is provided between the curved surface and the inner wall of the shell. The support member is an insulating support member, and at least a portion of the surface of the support member facing the shell is connected to at least a portion of the surface of the inner wall of the shell, and a portion of the surface of the support member facing the battery cell abuts against at least a portion of the surface of the battery cell. The surface of the support member abutting against the battery cell is a curved surface.

[0034] In an optional implementation, the support member is abutted against or bonded to the inner wall of the shell, and the support member and the shell are fixedly connected by abutting or bonding.

[0035] In an optional implementation, the support member is an elastic support member. Since the support member is an elastic support member, when the battery cell applies extrusion stress to the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion, avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell, and further reducing the possibility of short circuit between the battery cell and the shell.

[0036] In an optional implementation, the shell is a rectangular parallelepiped, and the support members are respectively provided between at least two opposite inner walls of the shell and the battery cell. Support members are provided between at least two opposite inner walls and the battery cell, and the number of support members is at least two, wherein two support members are arranged opposite to each other, and the battery cell is sandwiched between the two oppositely arranged support members, so that the battery cell is separated from the shell in at least two planes, and the battery cell is prevented from being squeezed by the shell.

[0037] In an optional implementation, the curved surface is a concave curved surface that is concave from the battery core to the inner wall of the shell, and at least part of the surface of the concave curved surface abuts against the curved surface. The concave curved surface abuts against the curved surface of the winding core, so that the curved surface of the winding core is confined within the concave curved surface, thereby achieving a positioning and supporting effect on the winding core.

[0038] In an optional implementation, there are two winding cores, and the surface of the support member facing the battery core includes two concave surfaces, each of which abuts against the curved surface of each winding core. The concave surface of each support member cooperates with the curved surface of each winding core to support and fix each winding core, thereby preventing multiple winding cores from tilting excessively.

[0039] In an optional implementation, a second connecting plate is provided between the two winding cores, and the second connecting plate is respectively connected to the supporting members on both sides of the battery core. The second connecting plate can separate the two winding cores to prevent the two winding cores from being tilted and squeezed.

[0040] The above-mentioned single battery adds a support member with elastic and insulating properties between the winding core and the shell, so that the two sides of the support member can abut against the winding core and the shell respectively. The surface of the support member abutting against the winding core is a curved surface, which can effectively support the winding core and prevent the winding core from tilting when placed on its side so that the corner contacts the shell; and because the support member is an elastic support member, when the battery cell exerts extrusion stress on the support member due to expansion, the support member can provide a certain deformation space to achieve stress dispersion and avoid stress accumulation at a specific position of the battery cell, thereby reducing the probability of lithium deposition in the battery cell, thereby reducing the possibility of short circuit between the battery cell and the shell, and increasing the battery life.

[0041] The single cells of the present application include but are not limited to lithium-ion batteries, sodium-ion batteries, potassium-ion batteries, calcium-ion batteries, magnesium-ion batteries, aluminum-ion batteries, etc., and there is no limitation on their types.

[0042] In a second aspect, the present application provides a battery pack, comprising a plurality of single cells as described in the first aspect, wherein the plurality of single cells are connected in series or in parallel. In addition to the single cells, the battery pack may also include a box, wherein the plurality of single cells connected in series or in parallel are arranged in the box, and the box is used to encapsulate the single cells. In some implementations, the plurality of single cells are in a side-lying state.

[0043] In a third aspect, the present application provides an energy storage system, including a power converter and a single cell or battery pack of the present application, wherein the power converter is used to convert the voltage output by the single cell or battery pack and output it to a power grid or an external load, and / or the power converter is used to convert the voltage output by an external power source and output it to the single cell or the battery pack. In some implementations, a plurality of single cells are in a side-laying state.

[0044] The technical effects that can be achieved in the second and third aspects mentioned above can be described with reference to the corresponding effects in the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of an energy storage cabinet;

[0046] Figure 2 It is a structural schematic diagram of an energy storage unit of an energy storage cabinet;

[0047] Figure 3 It is a structural schematic diagram of a base station energy storage device;

[0048] Figure 4 A schematic diagram of the front view structure of a single cell provided in one embodiment of the present application;

[0049] Figure 5 A schematic diagram of the three-dimensional structure of a single cell provided in one embodiment of the present application;

[0050] Figure 6 A schematic diagram of the side structure of a single cell provided in one embodiment of the present application;

[0051] Figure 7 A schematic diagram of a top view of a single cell provided in one embodiment of the present application;

[0052] Figure 8 A schematic side view of a single cell provided in another embodiment of the present application;

[0053] Fig. 9 A schematic side view of a single cell provided in another embodiment of the present application;

[0054] Fig.10 A schematic diagram of the structure of a side-placed single cell battery provided in an embodiment of the present application;

[0055] Fig.11 A schematic diagram of the exploded structure of a single cell provided in one embodiment of the present application;

[0056] Fig.12 A schematic diagram of the side view structure of a side-placed single cell provided in one embodiment of the present application;

[0057] Fig.13 A schematic diagram of the exploded structure of a single cell provided in another embodiment of the present application;

[0058] Fig.14 A schematic diagram of the side structure of a side-placed single cell provided in another embodiment of the present application;

[0059] Fig.15 A schematic diagram of the connection structure of an energy storage system provided in one embodiment of the present application.

[0060] Reference numerals:

[0061] 001-Energy storage cabinet; 002-Energy storage unit; 003-Energy storage equipment; 01-Single battery;

[0062] 1-shell; 2-top cover; 3-cell; 4-pole; 5-pole ear; 6-support member; 60-groove; 61-abutment column; 62-convex surface; 63-concave surface;

[0063] 64-first connecting plate; 65-second connecting plate; 31-positive electrode sheet; 32-diaphragm; 33-negative electrode sheet; 34-flat surface; 35-curved surface;

[0064] 100-battery pack; 200-power converter; 300-grid; 400-load; 500-photovoltaic panel. DETAILED DESCRIPTION

[0065] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0066] The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to be limiting of the present application. As used in the specification and appended claims of the present application, the singular expressions "a", "an", "above", "the" and "this" are intended to also include expressions such as "one or more", unless there is a clear contrary indication in the context.

[0067] References to "one embodiment" or "some embodiments" etc. described in this specification mean that a particular feature, structure or characteristic described in conjunction with the embodiment is included in one or more embodiments of the present application. Thus, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. that appear at different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "including", "comprising", "having" and their variations all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0068] A single cell, such as a lithium battery, generally includes a shell and a battery cell disposed in the shell. During normal charging, lithium ions are deintercalated from the positive electrode active material, move through the diaphragm and the electrolyte to the negative electrode, and are embedded in the negative electrode active material. When some abnormal conditions occur, such as excessive expansion or tilting of the battery cell, which causes partial squeezing of the inner wall of the battery cell and the shell, uneven force will be applied to the battery cell. Lithium deposition will occur in the stress concentration area of ​​the battery cell. The lithium metal or dendrites formed by lithium deposition can easily cause a short circuit between the battery cell and the shell, which will not only reduce the battery performance, but also greatly shorten the cycle life.

[0069] The following is an explanation of the application scenario of side-laying single cells in conjunction with the accompanying drawings.

[0070] Figure 1 FIG. 1 is a schematic diagram of the structure of an energy storage cabinet according to an embodiment of the present invention. Figure 1 As shown, the energy storage cabinet 001 may include multiple energy storage units 002 . Figure 1 In the illustrated embodiment, the energy storage cabinet 001 includes three energy storage units 002. The three energy storage units 002 can be stacked in the height direction. Figure 1 In addition to the stacking structure shown, the energy storage unit 002 can also be arranged in a side-by-side manner. The specific arrangement of the energy storage unit 002 can be arranged according to the specific installation scenario of the energy storage cabinet 001, and no specific limitation is made here.

[0071] Figure 2 FIG. 1 is a schematic diagram of the structure of an energy storage unit according to an embodiment of the present invention. Figure 2 As shown, the energy storage unit 002 may be provided with a plurality of single cells 01. Each single cell 01 is placed sideways. That is, the pole lead-out end of the single cell 01 is perpendicular to the ground. The plurality of single cells 01 may be connected in series or in parallel.

[0072] Figure 3 FIG. 1 is a schematic diagram of the structure of a base station energy storage device according to an embodiment of the present invention. Figure 3 As shown, the base station energy storage device 003 includes a plurality of single cells 01. Each single cell 01 is in a side-laying state. That is, the pole side of the single cell 01 is perpendicular to the ground. In the side-laying state, the battery cells in the single cell 01 will be tilted, thereby increasing the probability of lithium deposition.

[0073] It is understandable that the above is only an exemplary description of side-placed single-cell batteries. In the field of energy storage, there are other usage scenarios for side-placed batteries, which will not be described one by one here.

[0074] In order to solve the problem of lithium deposition when a single cell is placed on its side, an embodiment of the present application provides a single cell. The single cell includes a shell and a battery cell arranged in the shell. A support is provided between at least one inner wall of the shell and the battery cell, and the support is an insulating support, and a portion of the surface of the support facing the battery cell abuts against at least a portion of the surface of the battery cell. At least a portion of the surface of the support facing the shell is connected to the inner wall of the shell, for example, abutted or bonded. By providing a support to reduce the moving space of the battery cell and to reserve a certain amount of expansion space for the corners of the battery cell, the probability of squeezing the corners of the battery cell and the shell can be reduced, thereby improving the cycle life of the battery.

[0075] The following explains the structure of the battery cell by taking the battery cells of stacked core and wound core as examples.

[0076] For example, when the battery cell in the lithium battery is a stacked core, the stacked core will expand during the cycle, causing the stacked core to contact the inner wall of the shell and be squeezed by the shell. Since the stress points are concentrated on the corners of the stacked core, the stress of the shell is relatively high. Therefore, the corners of the stacked core are more prone to lithium deposition, which leads to lithium ion cycle failure. To solve this problem, an embodiment of the present application provides a single cell. By arranging a support between the shell and the battery cell, the probability of the corners of the battery cell contacting the shell is reduced, thereby reducing the problem of lithium deposition and improving the cycle life of the battery cell.

[0077] Figure 4 FIG. 1 is a schematic diagram of the front view of a single cell of an embodiment. Figure 4 As shown, the single battery includes a housing 1 , a battery cell 3 , a pole 4 and a pole ear 5 . Figure 5 FIG. 1 is a schematic diagram of the exploded structure of some components of a single cell according to an embodiment of the present invention. Figure 4 and Figure 5 As shown, the housing 1 is a rectangular parallelepiped structure, and its length direction is Figure 1 The x direction is shown in Figure 1 The y direction is shown in Figure 4 The z direction is shown in the figure. The shell 1 includes a bottom plate, a side plate and a top cover 2. The bottom plate and the top cover are arranged oppositely, and the side plate is arranged between the bottom plate and the top cover 2. In the height direction of the shell 1, the top of the shell 1 has an opening, and the top cover 2 covers the opening of the shell 1 to form a closed accommodation space with the shell 1. The battery cell 3 is a rectangular structure or a structure similar to a rectangular parallelepiped, which is arranged in the accommodation space formed by the shell 1 and the top cover 2 to achieve the packaging of the battery cell 3 to prevent the electrolyte from leaking out. The pole 4 includes a positive pole column and a negative pole column, and the two poles are arranged on the top cover 2 at intervals along the length direction x of the shell 1 and are fixedly connected to the top cover 2. The pole ear 5 includes a positive pole ear and a negative pole ear, one end of the positive pole ear is connected to the positive electrode sheet of the battery cell 3, and the other end is connected to the positive pole column. One end of the negative pole ear is connected to the negative electrode sheet of the battery cell 3, and the other end is connected to the negative pole column. The material of the shell 1 can be aluminum alloy, and its inner wall can be provided with an insulating film, such as Mylar film, to achieve an insulating setting with the battery cell 3.

[0078] Figure 6 is a schematic side view of a single cell structure of an embodiment, Figure 7 FIG. 1 is a schematic diagram of a side-mounted structure of a single cell according to an embodiment of the present invention. Figure 4 , Figure 6 and Figure 7 The battery cell 3 of the single battery is a stacked core. The stacked core includes a plurality of cells along the width direction of the shell 1 ( Figure 6The positive electrode sheet 31, the separator 32, and the negative electrode sheet 33 are arranged alternately and stacked in the y direction as shown in the figure. The positive electrode sheet 31, the separator 32, and the negative electrode sheet 33 may be rectangular or square. During the battery cycle, the thickness of the stack will increase due to expansion. Usually, a certain expansion gap is reserved between the stack and the inner wall of the shell to allow the stack to expand. However, when the expansion size of the core exceeds the reserved space, stress concentration is prone to occur at the four corners of the positive electrode sheet 31 and the negative electrode sheet 33 in the core, resulting in lithium deposition. In order to prevent the corners of the core from contacting the shell, a support may be provided between the core and the shell.

[0079] Reference Figure 5 , Figure 6 and Figure 7 , the battery cell is divided into a top surface, a bottom surface, a large surface and a small surface. Among them, the top surface and the bottom surface of the battery cell are surfaces perpendicular to the z direction. The top surface of the battery cell is the surface where the tabs are led out, and the bottom surface of the battery cell is the other surface opposite to the top surface. The large surface of the battery cell is the surface perpendicular to the y direction. The small surface of the battery cell is the surface perpendicular to the x direction. Along the arrangement direction of the positive electrode sheet 31 and the negative electrode sheet 33, that is, the direction perpendicular to the positive electrode sheet 31 or the negative electrode sheet 33 ( Figure 6 The support member 6 is disposed between the inner wall of the housing 1 and the stacked core, that is, the support member 6 is disposed between the housing 1 and the large surface of the stacked core. There may be two support members 6, that is, along the arrangement direction of the positive electrode sheet 31 and the negative electrode sheet 33, one support member 6 is provided between two oppositely disposed inner walls of the housing 1 and the battery cell, respectively.

[0080] Specifically, Figure 6 In the direction shown, a support member 6 is provided between the left inner wall of the shell 1 and the stacked core, and a support member 6 is provided between the right inner wall of the shell 1 and the stacked core. At least part of the surface of the support member 6 facing the shell 1 is connected to at least part of the surface of the inner wall of the shell 1, and the connection method can be abutment or bonding. The part of the surface of the support member 6 facing the stacked core abuts with at least part of the surface of the stacked core, which can support the stacked core and prevent the stacked core from tilting. The abutment method is convenient for assembling the battery and taking and placing the battery cell.

[0081] Reference Figure 6 and Figure 7, the surface of the support member 6 that abuts against the stacked core is a curved surface, so that a gap is formed between the stacked core and the support member 6, which is convenient for the circulation of the electrolyte, improves the infiltration effect of the electrolyte on the stacked core, and ensures the cycle performance of the battery. Among them, the curved surface of the support member 6 is a convex curved surface 62 that protrudes from one side of the inner wall of the shell 1 to the direction of the stacked core. Exemplarily, from the inner wall of the shell 1 to the direction of the stacked core, the thickness of the support member 6 gradually decreases from the geometric center of the convex curved surface 62 to the edge of the convex curved surface. The surface of the support member 6 facing the connection with the shell can be a plane. As an exemplary explanation, the support member 6 can be a spherical crown structure. The middle area of ​​the convex curved surface 62 of the support member 6 abuts against the positive electrode sheet 31 or the negative electrode sheet 33 of the stacked core, and a gap is formed between the edge portion of the convex curved surface 62 and the stacked core, providing expansion space for the corners of the stacked core, reducing the risk of the corners being squeezed during the cycle of the stacked core. When the gap between the edge portion of the support member 6 and the stacked core is large enough, the corners of the stacked core can also be completely avoided from being squeezed. The middle area of ​​the support member 6 is in contact with the stacked core, which not only supports the stacked core, but also forms a gap between the corners of the stacked core and the shell to allow the stacked core to expand cyclically. At the same time, the electrolyte can flow through the gap between the stacked core and the shell, which reduces the obstruction to the flow of the electrolyte, improves the infiltration effect of the electrolyte on the stacked core, and ensures the cycle performance of the battery.

[0082] Reference Figure 6 and Figure 7 The surface of the support member 6 facing the shell is a plane, which fits the inner wall of the shell and can be fixedly connected to the shell by bonding. Its circumferential size and shape can also be the same as the size and shape of the inner wall of the shell used to connect the support member. For example, the height of the support member 6 is the same as the height of the inner wall of the shell 1, and the length of the support member 6 is the same as the length of the inner wall of the shell 1. In addition, the maximum thickness of the support member 6 can be greater than the distance between the shell and the battery cell, so that the squeezing force between the battery cell and the shell can be used to fix the support member 6.

[0083] like Figure 7 As shown, another support member 6 is provided between the two side walls of the shell 1 and the battery cell 3 in a direction perpendicular to the arrangement direction of the positive electrode sheet 31 and the negative electrode sheet 33, that is, the other support member 6 is provided between the shell 1 and the small face of the battery cell 3. A groove is provided on the side of the other support member 6 facing the battery cell 3, and the end of the battery cell 3 is inserted into the groove, and a gap is left between the outer peripheral surface of the battery cell 3 and the groove to reserve expansion space for the battery cell 3 in its thickness direction. The arrangement of the other support member 6 can support the battery cell when the single cell is placed sideways along the small face direction, that is, the small face of the single cell is parallel to the placement surface, to prevent the battery cell from being squeezed and contacted with the shell.

[0084] In the embodiment of the present application, the support member 6 is an insulating support member to avoid short circuit with the stacked core and the inner wall of the shell 1, thereby improving the safety of the battery. In other embodiments, the support member 6 also has thermal conductivity. When the support member 6 is in contact with the shell 1, the heat inside the battery (especially the heat generated during the stacking cycle) can be transferred to the shell 1, thereby improving the heat dissipation performance of the battery.

[0085] The material of the support member 6 can be selected from one of the polymer materials such as polyethylene terephthalate, polystyrene, polyvinyl chloride, polyurethane, polyamide, polyethylene or polypropylene. The support member 6 made of the above materials can have a certain support strength in a non-extruded state, or a certain support strength in an extruded state, thereby supporting the battery cell. The support member 6 can be a solid structure or a hollow structure, as long as it can achieve a certain support effect.

[0086] In some embodiments, the support member 6 may be an elastic support member. When the battery cell expands and exerts force on the support member 6, the support member may deform to a certain extent to disperse the stress of the battery cell and avoid the influence of stress concentration on the battery cell.

[0087] Figure 8 FIG. 1 is a schematic diagram of a side view of a single cell of another embodiment. Figure 8 The support member 6 may include a plurality of abutment posts 61. The plurality of abutment posts 61 are dispersedly arranged on the inner wall of the shell. One end of each of the plurality of abutment posts 61 facing the battery cell 3 abuts against the battery cell, and the other end is fixedly connected to the inner wall of the shell, for example, by bonding or abutment. The surface of each abutment post 61 abutting against the stacked core may be a plane or a curved surface, which is not specifically limited here.

[0088] In some embodiments, the abutment column 61 may be an elastic member, which may be deformed to a certain extent when subjected to a squeezing force. The plurality of abutment columns 61 do not contact the corners of the stacked core, so as to provide expansion space for the corners of the stacked core. At the same time, the electrolyte can flow in the gaps between the plurality of abutment columns 61, which reduces the obstruction to the flow of the electrolyte, improves the infiltration effect of the electrolyte on the stacked core, and ensures the cycle performance of the battery.

[0089] Fig. 9 FIG. 1 is a schematic diagram of a side view of a single cell of another embodiment. Fig. 9In addition to a plurality of abutment posts 61, the support member also includes a first connecting plate 64. One end of the plurality of abutment posts 61 facing away from the battery cell is connected to the first connecting plate 64, and the first connecting plate 64 abuts or bonds with the inner wall of the shell 1. The first connecting plate 64 can be bonded to the plurality of abutment posts 61 or formed as one piece. To facilitate processing and installation, the first connecting plate 64 and the plurality of abutment posts 61 are an integrally formed structure. This arrangement facilitates the fixation between the plurality of abutment posts 61 and the inner wall of the shell 1, while improving the structural strength of the support member 6 and reducing the difficulty of processing and assembly.

[0090] The above is an explanation of the single cell battery with a stacked core structure. Figures 10 to 14 The following explains the single cell battery with a coil structure.

[0091] When the battery cell in the single battery is a roll core, the single battery can be placed on its side. When the single battery is placed upright, the roll core is suspended from the top cover by the tabs, and there is a gap between the roll core and the inner wall of the shell to allow the roll core to expand during the cycle. Fig.10 FIG. 1 is a schematic diagram of a side view structure of a side-mounted single cell according to an embodiment of the present invention. Fig.10 As shown in the figure, when the single battery is placed on its side, the bottom corner of the roll core will come into contact with the shell under the action of gravity. The volume of the roll core expands during the cycle, but the corner of the roll core is squeezed and restricted by the shell and cannot be released, resulting in severe lithium deposition at the corner, which in turn leads to cycle failure and shortened life.

[0092] Fig.11 The figure is a schematic diagram of the exploded structure of some components of a single cell according to an embodiment. Fig.12 FIG. 1 is a schematic diagram of the assembly structure of a single cell of an embodiment. Fig.11 and Fig.12 The battery cell 3 of the single cell is a winding core, which can be wound into a columnar structure by stacking the positive electrode sheet, the separator and the negative electrode sheet in sequence. After winding, the columnar structure can be extruded to form a structure similar to a rectangular parallelepiped. The winding core includes two oppositely arranged end faces, which are faces perpendicular to the winding direction. The circumferential side surface between the two end faces includes two oppositely arranged flat surfaces 34 and two oppositely arranged curved surfaces 35, and the two flat surfaces 34 and the two curved surfaces 35 are connected. The end face is along the height direction of the shell 1 ( Fig.11 The flat surface 34 is arranged along the width direction (z direction shown in FIG. 1 ), and the flat surface 34 is arranged along the width direction (z direction shown in FIG. 1 ) of the housing 1. Fig.11 The curved surface 35 is arranged along the length direction (y direction shown in FIG. 1 ) of the shell 1. Fig.11 The pole lugs 5 of the winding core are led out from one end surface of the winding core and are connected to the poles 4 of the top cover 2 respectively.

[0093] Reference Fig.11 and Fig.12In order to solve the problem of lithium deposition at the corner of the winding core, the single battery of the embodiment of the present application can be arranged along the length direction of the shell 1 ( Fig.11 In the x direction shown in FIG. 1 , a support member 6 is provided between the curved surface 35 of the winding core and the inner wall of the housing 1. There may be two support members 6, that is, in the length direction of the housing, one support member 6 is provided between two oppositely disposed inner walls of the housing 1 and the battery cell, respectively.

[0094] At least a portion of the surface of any support member 6 facing the shell 1 is connected to at least a portion of the surface of the inner wall of the shell 1. Exemplarily, the connection method can be abutment or bonding. The partial surface of the support member 6 facing the core abuts at least a portion of the surface of the core, and the surface of the support member 6 abutting the core is a curved surface. Among them, the curved surface of the support member 6 is a concave curved surface 63 that is concave from the core to the inner wall of the shell 1. By abutting the concave curved surface with the curved surface, the curved surface can be used to effectively cover the curved surface of the core, thereby achieving effective support for the core and preventing the core from tilting excessively when placed on its side so that the curved surface of the curling edge contacts the shell 1. The abutment between the support member 6 and the battery cell facilitates the assembly of single cells.

[0095] Reference Fig.11 and Fig.12 , a groove 60 is provided on the side of the support member 6 facing the core, and the groove extends along the height direction of the shell. The bottom surface of the groove forms a concave curved surface 63 of the support member. After assembly, the curved surface 35 of the core is located in the groove of the support member 6 and abuts against the concave curved surface 63. Among them, the depth dimension of the groove 60 can be greater than the protruding dimension of the curved surface, and the width of the groove 60 is less than the width of the curved surface. The depth dimension of the groove 60 is the dimension of the groove 60 along the length direction of the shell 1, and the width dimension of the groove 60 is the dimension of the groove 60 along the width direction of the shell 1. As a result, a gap can be provided between a part of the concave curved surface 63 and a part of the curved surface, so that the core has a certain expansion space during the expansion process, reducing the degree of extrusion. In addition, the concave curved surface 63 can also abut against a part of the curved surface through the following dimensional relationship, such as the curvature radius of the concave curved surface 63 is greater than the curvature radius of the curved surface. Of course, if the gap between the support member 6 and the corner of the core is large enough, the corner of the core can be completely prevented from being extruded. The gap size between the support member 6 and the corner of the winding core needs to be reasonably set according to the actual application situation to ensure the support of the winding core. For example, in some embodiments, the width of the concave surface 63 of the two oppositely arranged support members 6 is ( Fig.11 The y direction is slightly larger than the core width direction ( Fig.11The size of the concave surface 63 of the support member 6 is sized to ensure that the position of the core is fixed within a certain range without excessive tilting to avoid contact between the core and the shell. It is understood that the smaller the difference between the size of the support member 6 and the size of the core, the better the support effect of the support member 6 on the core.

[0096] In addition, the support member 6 is an elastic insulating support member. When the core expands during the charging and discharging process, the support member 6 can be deformed accordingly to provide expansion space for the core, reduce the degree of squeezing of the corners of the core, reduce the risk of lithium deposition, and avoid the occurrence of short circuits between the core and the inner wall of the shell 1, thereby improving the safety of the battery. In other embodiments, the support member 6 is also thermally conductive. When the support member 6 is in contact with the shell 1, the heat inside the battery (especially the heat generated during the core circulation process) can be transferred to the shell 1, thereby improving the heat dissipation performance of the battery.

[0097] Reference Fig.11 and Fig.12 The surface of the support member 6 connected to the shell is a plane, which fits the inner wall of the shell 1 and can be fixedly connected to the shell by bonding. Its circumferential size and shape can also be the same as the size and shape of the inner wall of the shell for connecting the support member. In addition, the maximum thickness of the support member 6 can be greater than the spacing between the shell and the battery cell, so that the squeezing force between the battery cell and the shell can be used to fix the support member 6.

[0098] In the embodiment of the present application, the support member 6 is an insulating support member to avoid short circuit with the winding core and the inner wall of the shell 1, thereby improving the safety of the battery. In other embodiments, the support member 6 also has thermal conductivity. When the support member 6 is in contact with the shell 1, the heat inside the battery (especially the heat generated during the circulation of the winding core) can be transferred to the shell 1, thereby improving the heat dissipation performance of the battery.

[0099] The material of the support member 6 can be selected from one of the polymer materials such as polyethylene terephthalate, polystyrene, polyvinyl chloride, polyurethane, polyamide, polyethylene or polypropylene. The support member 6 made of the above materials can have a certain support strength in a non-extruded state, or a certain support strength in an extruded state, thereby supporting the battery cell. The support member 6 can be a solid structure or a hollow structure, as long as it can achieve a certain support effect.

[0100] In some embodiments, the support member 6 may be an elastic support member. When the battery cell expands and exerts force on the support member 6, the support member may deform to a certain extent to disperse the stress of the battery cell and avoid the influence of stress concentration on the battery cell.

[0101] Continue to refer to Fig.11 and Fig.12 In one embodiment, the number of cores may be two. The two cores are arranged in the width direction y. The support member 6 is bonded or abutted against the inner wall of the shell 1, and accordingly, the surface of the support member 6 facing the core includes two concave surfaces 63, and each concave surface 63 abuts against the curved surface 35 of each core, so that the concave surface 63 of each support member 6 can cooperate with the curved surface of each core to achieve the supporting and fixing effect on each core and prevent multiple cores from tilting. In other embodiments, the number of cores may also be 3 or more, and the support member 6 also has 3 or more concave surfaces 63 corresponding to the number of cores, and each concave surface 63 abuts against the curved surface 35 of each core to achieve the supporting and fixing effect on each core.

[0102] Fig.13 A schematic diagram of the exploded structure of a single cell according to another embodiment. Fig.14 for Fig.13 The schematic diagram of the top view of the single cell structure of the embodiment shown. Fig.13 and Fig.14 , a second connecting plate 65 is provided between the two winding cores, and the second connecting plate 65 is respectively connected to the support members 6 on both sides of the battery core 3, and the second connecting plate 65 is connected to the two support members 6 to form an I-shaped structure. The thickness of the second connecting plate 65 may be less than the spacing between the two battery cores 3. The height dimension of the second connecting plate 65 may be the same as the height of the two battery cores, and the length of the second connecting plate may be the same as the length of the flat surface of the two battery cores. The support members 6 on both sides of the battery core 3 can be connected to the inner wall of the shell 1 by bonding or abutting, and the second connecting member 65 is bonded or integrally formed with the support members 6 on both sides. By setting the second connecting member 65, the separation effect of the support member 6 on the two winding cores can be better realized, and the problem of tilting and squeezing of the two winding cores can be prevented. In other embodiments, the number of winding cores can also be 3 or more, and a second connecting member 65 can also be provided between every two winding cores, so as to facilitate the fixing of the support member 6 to multiple winding cores, and at the same time improve the structural strength of the support member 6.

[0103] Among them, in one assembly method, during packaging, the support member and the battery cell can be assembled first, and then the support member and the battery cell can be wrapped with an insulating film, and then the support member and the battery cell coated with the insulating film can be placed in the shell. In another assembly method, when the insulating film is directly attached or coated on the surface of the shell, the support member and the battery cell can be directly placed in the shell for assembly. The specific assembly method can be selected according to the structure of the support member, the type of battery cell and the setting method of the insulating film, and is not specifically limited here.

[0104] The above only uses lithium batteries as examples, but the single battery of the present application is not limited to lithium batteries, and can also be sodium batteries, potassium batteries, magnesium batteries or calcium batteries.

[0105] Based on the same technical concept, the embodiment of the present application provides a battery pack 100, including multiple single cells of the embodiment of the present application, and multiple single cells can be connected in series or in parallel through external connectors. Since the battery pack 100 includes all the technical features of the single cell, the battery pack 100 also includes all the beneficial effects of the single cell, which will not be repeated here.

[0106] Based on the same technical concept, an embodiment of the present application provides an energy storage system. Fig.15 Figure 1 is a schematic diagram of the connection structure of an energy storage system. Fig.15 As shown, the energy storage system includes the battery pack 100 and the power converter 200 of the present application, wherein the power converter 200 is used to convert the voltage output by the battery pack 100 and output it to the power grid 300 or the external load 400, and / or the power converter 200 is used to convert the voltage output by the external power supply and output it to the battery pack 100. Among them, the battery pack 100 can be connected to the photovoltaic module 500, and the photovoltaic module 500 is used to charge the battery pack 100. Since the energy storage system includes the battery pack 100, and the battery pack 100 includes all the technical features of the single cell, the energy storage system also includes all the beneficial effects of the single cell, which will not be repeated here.

[0107] In summary, the single cell, battery pack and energy storage system provided in the present application can reduce the degree of squeezing of the corners of the upright stacked core battery and the corners of the sideways rolled core battery during use, thereby reducing the risk of lithium plating and increasing the service life of the single cell.

[0108] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A single cell battery, characterized in that: It comprises a shell and a battery cell arranged in the shell; a support member is provided between at least one inner wall of the shell and the battery cell, the support member is an insulating support member, at least part of the surface of the support member facing the battery cell abuts against part of the surface of the battery cell facing the support member, and the surface of the support member abutting against the battery cell is a curved surface.

2. The single cell according to claim 1, characterized in that: At least a portion of the surface of the support member facing the housing is connected to the inner wall of the housing.

3. The single cell according to claim 2, characterized in that: The support member abuts against the inner wall of the shell.

4. The single cell according to claim 1, characterized in that: The supporting member is an elastic supporting member.

5. The single cell according to any one of claims 1 to 4, characterized in that: The shell is a rectangular parallelepiped, and the supporting members are respectively arranged between at least two opposite inner walls of the shell and the battery core.

6. The single cell according to claim 5, characterized in that: The battery core is a stacked core, comprising positive electrode sheets and negative electrode sheets alternately stacked; along the arrangement direction of the positive electrode sheets and the negative electrode sheets, the support member is arranged between the inner wall of the shell and the battery core.

7. The single cell according to claim 6, characterized in that: The surface of the support member abutting against the battery core is a convex surface.

8. The single cell according to claim 7, characterized in that: The thickness of the support member gradually decreases from the geometric center of the convex surface to the edge of the convex surface.

9. The single cell according to claim 8, characterized in that: The support member is in a spherical crown structure.

10. The single cell according to claim 6, characterized in that: The support member includes a plurality of abutment posts, and along the arrangement direction of the positive electrode sheet and the negative electrode sheet, one end of each of the plurality of abutment posts facing the battery cell abuts against the battery cell.

11. The single cell according to claim 10, characterized in that: One end of the abutting column facing away from the battery core abuts against the inner wall of the shell.

12. The single cell according to claim 10, characterized in that: The support member further includes a first connecting plate, the first connecting plate abuts against the inner wall of the shell, and one end of the abutting column facing away from the battery core is connected to the first connecting plate.

13. The single cell according to claim 6, characterized in that: In a direction perpendicular to the arrangement direction of the positive electrode sheet and the negative electrode sheet, another support member is respectively provided between the two side walls of the shell and the battery cell, and a groove is provided on the side of the other support member facing the battery cell. The battery cell is inserted into the groove, and a gap is left between the outer peripheral surface of the battery cell and the groove.

14. The single cell according to any one of claims 1 to 4, characterized in that: The battery core is a winding core, and the peripheral side surface of the winding core includes two oppositely arranged flat surfaces and two oppositely arranged curved surfaces. Along the oppositely arranged directions of the two curved surfaces of the same winding core, the support member is provided between the curved surface and the inner wall of the shell.

15. The single cell according to claim 14, characterized in that: The surface of the support member abutting against the battery core is a concave curved surface that is concave in a direction from the battery core to the inner wall of the shell.

16. The single cell according to claim 15, characterized in that: At least a portion of the concave surface abuts against the curved surface.

17. The single cell according to claim 15, characterized in that: There are two winding cores, and the surface of the support member facing the battery core includes two concave surfaces, and each of the concave surfaces abuts against the curved surface of each of the winding cores.

18. The single cell according to claim 17, characterized in that: A second connecting plate is provided between the two winding cores, and the second connecting plate is respectively connected to the supporting members on both sides of the battery core.

19. A battery pack, characterized in that: The method comprises a plurality of single cells according to any one of claims 1 to 18, wherein the plurality of single cells are connected in series or in parallel.

20. The battery pack according to claim 19, characterized in that: The plurality of single cells are in a side-lying state.

21. An energy storage system, characterized in that: It includes a power converter and a single cell as described in any one of claims 1 to 18 or a battery pack as described in any one of claims 19 to 20, wherein the power converter is used to perform power conversion on the voltage output by the single cell or the battery pack and output it to a power grid or an external load, and / or the power converter is used to perform power conversion on the voltage output by an external power source and output it to the single cell or the battery pack.

22. The energy storage system according to claim 21, characterized in that: The single battery is in a side-lying state, or the single battery in the battery pack is in a side-lying state.

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