Battery cell, battery pack and electric equipment

Abstract

The utility model provides a battery cell, a battery pack and electric equipment, and the battery cell comprises a shell; the cover plate assembly is connected with the shell to form a closed space; the electrode assembly is arranged in the closed space; the bulge is arranged on at least one side of two opposite sides of the shell along the length direction, and / or is arranged on at least one side of two opposite sides of the shell along the width direction; the shell is provided with a protrusion, the protrusion is located at the end, close to the cover plate assembly, of the shell, the internal space of the protrusion is used for containing the electrode assembly, the side face of the shell forms a containing space in the area except the area where the protrusion is arranged, and the containing space is used for containing a heat exchange plate or a frame of a battery pack. The battery cell, the battery pack and the electric equipment provided by the utility model are simple in structure, convenient to manufacture, high in space utilization rate and high in battery energy density, and meanwhile, the structural stability is ensured.

Description

Technical Field

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

[0002] A rechargeable battery is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. With the continuous development of new energy technologies, prismatic batteries are widely used in energy storage and power applications. As demand for higher energy density increases, individual battery cells are evolving towards larger capacities and sizes. Existing cells have low space utilization when assembled into batteries, and their energy density needs further improvement. Therefore, there is an urgent need for a structurally optimized battery cell. Utility Model Content

[0003] In view of this, the purpose of this application is to provide a battery cell, battery pack and electrical device to solve the related problems mentioned in the background art.

[0004] A first aspect of this application provides a battery cell, comprising: a housing; a cover assembly connected to the housing to form an enclosed space; an electrode assembly disposed within the enclosed space; and a protrusion disposed on at least one of two opposite sides of the housing along its length direction, and / or on at least one of two opposite sides of the housing along its width direction; the protrusion is located at one end of the housing near the cover assembly, the internal space of the protrusion is used to accommodate the electrode assembly, and the side of the housing forms a receiving space in the area other than where the protrusion is disposed, the receiving space being used to accommodate a heat exchange plate or frame of a battery pack.

[0005] Furthermore, the housing is provided with protrusions on both opposite sides along the width direction.

[0006] Furthermore, the width of the housing when the protrusion is not provided is a first width W1, and the width when the protrusion is provided is a second width W2, satisfying 1.15W1≥W2>W1.

[0007] Furthermore, the second width is 1 mm to 4 mm greater than the first width.

[0008] Furthermore, the housing is provided with protrusions on both opposite sides along the length direction.

[0009] Furthermore, the length of the housing without the protrusion is a first length L1, and the length with the protrusion is a second length L2, satisfying 1.15L1≥L2>L1.

[0010] Furthermore, the second length is 1 mm to 10 mm longer than the second length.

[0011] Furthermore, the height of the shell is H1, and the length of the protrusion along the height direction of the shell is H2, satisfying 0.6H1≥H2≥2mm.

[0012] A second aspect of this application provides a battery pack, including a housing, wherein at least one row of battery cell stacks is provided inside the housing, each row of battery cell stacks includes a plurality of stacked battery cells as described in the first aspect above, and a heat exchange plate or frame is provided in the housing space of the battery cells.

[0013] A third aspect of this application provides an electrical device including a battery pack as described in the second aspect above.

[0014] As can be seen from the above description, the battery cell, battery pack, and electrical device provided in this application include the following: the battery cell comprises: a housing; a cover plate assembly connected to the housing to form a closed space; an electrode assembly disposed within the closed space; and a protrusion disposed on at least one of two opposite sides of the housing along its length direction, and / or on at least one of two opposite sides of the housing along its width direction. The protrusion is located at one end of the housing near the cover plate assembly, and the internal space of the protrusion is used to accommodate the electrode assembly. The side of the housing forms a receiving space in the area outside the protrusion, which is used to accommodate the heat exchange plate or frame of the battery pack. By providing a protrusion on the side wall of the housing, the internal space of the protrusion can accommodate the corresponding electrode assembly, increasing the capacity of a single battery cell. The receiving space outside the protrusion can accommodate the frame or heat exchange plate. Without affecting the assembly strength or heat exchange effect, the space utilization rate of the battery cell in the battery pack can be improved, and the battery energy density can be increased. The protrusion is located at the end of the housing near the cover plate assembly, facilitating the placement of the electrode assembly inside the housing. This battery cell, battery pack, and electrical device have a simple structure, are easy to manufacture, have high space utilization, high battery energy density, and ensure structural stability. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this application or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a battery cell in an embodiment of this application;

[0017] Figure 2 for Figure 1 A cross-sectional schematic diagram of the battery cell;

[0018] Figure 3 This is a schematic diagram of the structure of another type of battery cell in an embodiment of this application;

[0019] Figure 4 for Figure 3 A cross-sectional schematic diagram of the battery cell;

[0020] Figure 5 This is a cross-sectional schematic diagram of a battery pack according to an embodiment of this application;

[0021] Figure 6 This is a cross-sectional schematic diagram of a battery cell stack in an embodiment of this application.

[0022] Reference numerals: 1. Shell; 1-1. Protrusion; 1-2. Accommodation space; 2. Cover plate assembly; 3. Electrode assembly; 4. Heat exchange plate; 5. Frame; 6. Cell stack; 7. Cell; 8. Box. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0024] It should be noted that, unless otherwise defined, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0025] A rechargeable battery is a battery that can be recharged after discharge to reactivate its active materials and continue to be used. With the continuous development of new energy technologies, prismatic batteries are widely used in energy storage and power applications. As demand for higher energy density increases, individual battery cells are constantly evolving towards larger capacities and sizes.

[0026] Existing battery cells, for example, have a cuboid structure. Multiple cells are stacked together and placed in a box to form a battery pack. To ensure the assembly strength or heat exchange effect of the cells in the battery pack, frames are usually set between adjacent cell stacks for separation and support, or heat exchange plates are set between adjacent cells for heat exchange. The dimensions of the heat exchange plates and frames are usually the same as the dimensions of the cell side. Battery packs designed in this way have low space utilization, and the energy density of cells needs to be further improved when assembled. Therefore, there is an urgent need for a battery cell with optimized structure.

[0027] The following describes specific embodiments in conjunction with the appendix. Figures 1 to 6 The technical solution of this application will be further described in detail.

[0028] In some embodiments of this application, a battery cell 7 is provided, such as... Figures 1 to 4 As shown, it includes: a housing 1; a cover plate assembly 2 connected to the housing 1 to form a closed space; an electrode assembly 3 disposed within the closed space; a protrusion 1-1 disposed on at least one of the opposite sides of the housing 1 along the length direction, and / or disposed on at least one of the opposite sides of the housing 1 along the width direction; the protrusion 1-1 is located at one end of the housing 1 near the cover plate assembly 2, the internal space of the protrusion 1-1 is used to accommodate the electrode assembly 3, and the side of the housing 1 forms a receiving space 1-2 in the area other than where the protrusion 1-1 is disposed, the receiving space 1-2 is used to accommodate the heat exchange plate 4 or frame 5 of the battery pack.

[0029] like Figure 1 As shown in the figure, the L direction is the length direction of the battery cell 7, and the W direction is the width direction of the battery cell 7.

[0030] The cover plate assembly 2 includes a cover plate body and an electrode post penetrating the cover plate body. The cover plate body is, for example, an aluminum plate, but the specific type is not limited. An explosion-proof hole may be provided in the middle of the cover plate body. In the event of thermal runaway of the cover plate assembly 2, high-temperature gases can be discharged through the explosion-proof hole to prevent an explosion. The electrode post includes, for example, a positive electrode post and a negative electrode post. One end of the electrode post is located below the cover plate body for electrical connection with the tab of the electrode assembly 3; the other end of the electrode post is located above the cover plate body for electrical connection with the external circuit of the cover plate assembly 2. An upper insulating component is provided at the top of the cover plate body, and a lower insulating component is provided at the bottom. The insulating components are, for example, plastic components, to ensure insulation between the cover plate body and the electrode post. A riveting component is provided on the top surface of the upper insulating component. The electrode post passes through the lower insulating component, the cover plate body, and the upper insulating component in sequence and is riveted to the riveting component. The riveting component is, for example, a conductive block, which can be electrically connected to the external circuit. The upper insulating component is located between the riveting component and the cover plate body, ensuring insulation between the riveting component and the cover plate body. The cover plate body is also provided with a liquid injection hole that penetrates the cover plate body, which is used to inject electrolyte into the cover plate assembly 2.

[0031] The housing 1 is, for example, an aluminum shell open at one end, which can be welded to the cover assembly 2. Figure 2 and Figure 4 As shown, the housing 1 and the cover assembly 2 form a closed space to accommodate the electrode assembly 3.

[0032] The protrusion 1-1 is disposed on at least one of the opposite sides of the housing 1 along the length direction, and / or on at least one of the opposite sides of the housing 1 along the width direction; for example Figure 1 As shown, protrusions 1-1 are formed on opposite sides of the housing 1 along the width direction; for example... Figure 3 As shown, protrusions 1-1 are formed on opposite sides of the shell 1 along the length direction; protrusions 1-1 can be provided on one side of the shell 1 or on all four sides of the shell 1, and there is no specific limitation.

[0033] The protrusion 1-1 is a hollow block structure, which can be formed by stamping the shell 1. The shape of the electrode assembly 3 is adapted to the shape of the enclosed space. The internal space of the protrusion 1-1 can accommodate the corresponding part of the electrode assembly 3, which can increase the capacity of the single cell 7; for example Figure 2 and Figure 4 As shown, protrusion 1-1 is located at the top, that is, at the end of housing 1 near cover plate assembly 2. Electrode assembly 3 can be placed inside housing 1 from top to bottom, which avoids obstructing the installation of electrode assembly 3 compared to other positions.

[0034] The side of the housing 1 forms a receiving space 1-2 in the area other than the protrusion 1-1, such as Figure 2 and Figure 4 The location of the dashed box in the image, the receiving space 1-2 outside the protrusion 1-1 can accommodate the frame 5 or the heat exchange plate 4, such as... Figure 5 and Figure 6 As shown, the frame 5 or heat exchange plate 4 can be inserted into the accommodating space 1-2 and fit tightly against the side wall of the shell 1, which not only ensures the assembly strength or heat exchange effect, but also improves the space utilization rate of the cell 7 in the battery pack and increases the battery energy density.

[0035] The battery cell 7 has a simple structure, is easy to manufacture, has high space utilization, high battery energy density, and ensures structural stability.

[0036] In some embodiments, such as Figure 1 and Figure 2 As shown, the housing 1 has protrusions 1-1 on both sides opposite to each other along the width direction.

[0037] like Figure 1 As shown, protrusions 1-1 are provided on both opposite sides of the housing 1 along the width direction, which can further increase the capacity of a single battery cell 7, and when multiple battery cells 7 are stacked, as... Figure 6As shown, a larger space 1-2 can be formed between adjacent cells 7 to accommodate a larger frame 5 or heat exchange plate 4, ensuring the structural stability of adjacent cells 7 in the battery pack.

[0038] In some embodiments, such as Figure 2 As shown, the width of the housing 1 at the location where the protrusion 1-1 is not provided is the first width W1, and the width at the location where the protrusion 1-1 is provided is the second width W2, satisfying 1.15W1≥W2>W1.

[0039] like Figure 2 As shown, W1 is the first width and W2 is the second width. The setting is 1.15W1≥W2>W1, for example, W2 is 1.03W1, 1.05W1, 1.07W1, 1.10W1 or 1.15W1, etc., without specific limitation, to avoid the width of the protrusion 1-1 being too large, making the size of the accommodating space 1-2 too large, while the size of the electrode assembly 3 at the corresponding position is small, resulting in a decrease in battery energy density.

[0040] In some embodiments, the second width is 1 mm to 4 mm greater than the first width.

[0041] W2-W1 can be 1mm, 2mm, 3mm or 4mm, etc., with no specific limit, to ensure assembly strength or heat exchange effect while ensuring battery energy density.

[0042] In some embodiments, such as Figure 3 and Figure 4 As shown, the housing 1 has protrusions 1-1 on both opposite sides along the length direction.

[0043] like Figure 3 As shown, protrusions 1-1 are provided on both opposite sides of the casing 1 along its length, which can further increase the capacity of a single battery cell 7, and when multiple battery cell stacks 6 are placed inside the housing 8, as... Figure 5 As shown, a larger storage space 1-2 can be formed between adjacent cell stacks 6 to accommodate a larger frame 5 or heat exchange plate 4, ensuring the structural stability of adjacent cell stacks 6 in the battery pack.

[0044] In some embodiments, such as Figure 4 As shown, the length of the housing 1 at the point where the protrusion 1-1 is not provided is the first length L1, and the length at the point where the protrusion 1-1 is provided is the second length L2, satisfying 1.15L1≥L2>L1.

[0045] like Figure 4As shown, L1 is the first length and L2 is the second length. The setting is 1.15L1≥L2>L1, for example, L2 is 1.03L1, 1.05L1, 1.07L1, 1.10L1 or 1.15L1, etc., and there is no specific limitation. This is to avoid the length of the protrusion 1-1 being too large, which would make the size of the accommodating space 1-2 too large, while the size of the electrode assembly 3 at the corresponding position is too small, resulting in a decrease in the energy density of the battery.

[0046] In some embodiments, the second length is greater than the second length by 1 mm to 10 mm.

[0047] L2-L1 can be 1mm, 2mm, 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm or 10mm, etc., with no specific limit, to ensure assembly strength or heat exchange effect while ensuring battery energy density.

[0048] In some embodiments, such as Figure 2 and Figure 4 As shown, the height of the housing 1 is H1, and the length of the protrusion 1-1 along the height direction of the housing 1 is H2, satisfying 0.6H1≥H2≥2mm.

[0049] like Figure 2 and Figure 4 As shown, H1 is the height of the housing 1, and H2 is the length of the protrusion 1-1 along the height direction of the housing 1. It is set to 0.6H1≥H2≥2mm, for example, H2 is 0.1H1, 0.2H1, 0.3H1, 0.4H1, 0.5H1 or 0.6H1, etc., and there is no specific limitation. This is to avoid H2 being too small, which would make manufacturing difficult and would result in less increase in the capacity of the single cell 7, making the size of the housing space 1-2 too large, leading to a decrease in battery energy density; it is also to avoid H2 being too large, which would make the size of the housing space 1-2 too small, making it impossible to ensure assembly strength or heat exchange effect.

[0050] In some embodiments of this application, a battery pack is provided, such as... Figure 5 and Figure 6 As shown, it includes a housing 8, which contains at least one row of battery cell stacks 6. Each row of battery cell stacks 6 includes multiple stacked battery cells 7 as described in any of the above embodiments. A heat exchange plate 4 or a frame 5 is provided in the housing space 1-2 of the battery cells 7.

[0051] The battery pack is, for example, a battery module or a battery pack. The battery pack includes a housing 8, which is the main load-bearing component of the battery pack. Its material should have characteristics such as high strength, electrical insulation, high heat dissipation and chemical stability, such as using polymer composite materials. The housing 8 contains at least one row of cell stacks 6, and the cell stacks 6 include multiple cells 7.

[0052] like Figure 5As shown, the housing 8 has two rows of battery cell stacks 6 inside. A heat exchange plate 4 or a frame 5 is provided in the accommodating space 1-2 between two adjacent battery cell stacks 6. A heat exchange plate 4 or a frame 5 is also provided in the accommodating space 1-2 where the battery cell stacks 6 abut against the housing 8. The frame 5 is integrally formed with the housing 8, which can ensure the assembly strength of the battery cell stacks 6. The heat exchange plate 4 is, for example, a liquid cooling plate, which can balance the temperature of the battery cell stacks 6.

[0053] like Figure 6 As shown, the battery cell stack 6 includes six battery cells 7. A heat exchange plate 4 or a frame 5 is provided in the accommodating space 1-2 between two adjacent battery cells 7. A heat exchange plate 4 or a frame 5 is also provided in the accommodating space 1-2 of the battery cell 7 near the housing 8. This can ensure the assembly strength of the battery cells 7 or balance the temperature of the battery cells 7.

[0054] This battery pack has high space utilization, stable structure, and long service life.

[0055] In some embodiments of this application, an electrical device is provided, including a battery pack as described in any of the above embodiments.

[0056] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. Spacecraft include airplanes, rockets, space shuttles, and spacecraft. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0057] Those skilled in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of this application (including the claims) is limited to these examples; within the framework of this application, the technical features of the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations of different aspects of the embodiments of this application as described above, which are not provided in the details for the sake of brevity.

[0058] Furthermore, given that details have been set forth to describe exemplary embodiments of this application, it will be apparent to those skilled in the art that embodiments of this application may be practiced without these details or with variations thereof. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0059] Although this application has been described in conjunction with embodiments thereof, many substitutions, modifications and variations of these embodiments will be apparent to those skilled in the art from the foregoing description.

[0060] The embodiments of this application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the embodiments of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: case; The cover plate assembly is connected to the housing to form a closed space; Electrode assemblies are disposed within the enclosed space; A protrusion is provided on at least one of the opposite sides of the housing along the length direction, and / or on at least one of the opposite sides of the housing along the width direction; the protrusion is located at one end of the housing near the cover plate assembly, the internal space of the protrusion is used to accommodate the electrode assembly, and the side of the housing forms a receiving space in the area other than where the protrusion is provided, the receiving space is used to accommodate the heat exchange plate or frame of the battery pack.

2. The battery cell according to claim 1, characterized in that, The shell has protrusions on both opposite sides along the width direction.

3. The battery cell according to claim 2, characterized in that, The width of the housing without the protrusion is a first width W1, and the width with the protrusion is a second width W2, satisfying 1.15W1≥W2>W1.

4. The battery cell according to claim 3, characterized in that, The second width is 1mm to 4mm greater than the first width.

5. The battery cell according to claim 1, characterized in that, The shell has protrusions on both opposite sides along its length.

6. The battery cell according to claim 5, characterized in that, The length of the housing without the protrusion is a first length L1, and the length with the protrusion is a second length L2, satisfying 1.15L1≥L2>L1.

7. The battery cell according to claim 6, characterized in that, The second length is 1 mm to 10 mm longer than the second length.

8. The battery cell according to claim 1, characterized in that, The height of the shell is H1, and the length of the protrusion along the height direction of the shell is H2, satisfying 0.6H1≥H2≥2mm.

9. A battery pack, characterized in that, The device includes a housing, which contains at least one row of battery cell stacks. Each row of battery cell stacks includes a plurality of battery cells stacked together as described in any one of claims 1-8. A heat exchange plate or frame is provided in the housing space of the battery cells.

10. An electrical appliance, characterized in that, Includes the battery pack as described in claim 9.

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