Thimble and square battery

Abstract

The application provides a bottom support sheet and a square battery. The bottom support sheet can be located between a battery shell and an electric core, and comprises a base plate. The base plate is provided with a through hole in the thickness direction thereof. The side of the base plate facing the electric core is provided with a concave part. The side of the base plate away from the concave part is provided with a convex part. The convex part is arranged so that the base plate and the battery shell have a gap therebetween. The gap is communicated with the through hole. The application can reduce the space occupied by the bottom support sheet in the battery shell, leave more space for electrolyte, and improve the energy density of the battery.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a base plate and a square battery. Background Technology

[0002] Square battery casings typically feature rounded corners (R3) at the bottom and perimeter, resulting in a relatively narrow bottom space. When the battery cell is installed inside the casing, its bottom edge is easily deformed due to pressure from the rounded corners. To address this issue, a common method is to place a base support plate of a certain thickness at the bottom to ensure even force distribution on the cell. However, the existing base support plate design occupies a significant portion of the battery casing space, causing compression of the electrolyte and consequently reducing the battery's energy density. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a base plate and a square battery, which can reduce the space occupied by the base plate in the battery casing, leave more space for electrolyte, and improve the energy density of the battery.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] The first aspect of this utility model discloses a base plate, which can be located between a battery casing and a battery cell, and includes a substrate. The substrate has a through hole along its thickness direction, a recessed portion on the side of the substrate facing the battery cell, and a protrusion on the side of the substrate away from the recessed portion. The protrusion is configured to create a gap between the substrate and the battery casing, and the gap communicates with the through hole.

[0006] In the above technical solution, by setting protrusions on the base plate, more space can be provided between the base plate and the battery casing. This not only supports the battery cell but also increases the flow space for the electrolyte, thereby improving the wetting effect of the electrolyte. At the same time, by setting recesses and through holes on the base plate, the storage space for the electrolyte is further increased while reducing its own weight, thereby improving the flow and diffusion rate of the electrolyte. Moreover, the base plate has a simple structure, is easy to manufacture, and does not require excessive space, thus improving the volumetric energy density of the battery.

[0007] Furthermore, the protrusion extends from the end face of the substrate that forms the recess in a direction away from the battery cell. This allows the base plate to support the battery cell while further reducing its own weight.

[0008] Furthermore, multiple recesses and protrusions are provided, with the recesses spaced apart on the surface of the substrate and the protrusions corresponding one-to-one with the recesses. This effectively disperses the pressure on the substrate, ensures the stability of the base plate supporting the battery cell, and provides more ample storage space for the electrolyte.

[0009] Furthermore, multiple through holes are provided, and these through holes are spaced apart on the surface of the substrate. This distribution of multiple through holes can further improve the electrolyte flow efficiency, increase storage space, and, while ensuring the structural strength of the base plate, further reduce its weight and increase the energy density of the battery.

[0010] Furthermore, the sum of the thickness of the substrate and the height of the protrusion protruding from the substrate surface is 0.5–0.8 mm. The base plate is used to support the battery cell. If the height of the base plate is too high, it will reduce the effective space inside the casing, thereby squeezing the space for materials such as the battery cell and electrolyte. If the height of the base plate is too low, it will cause the edge of the battery cell to collide and be squeezed with the rounded corner of the bottom of the casing, resulting in excessive pressure on the edge of the battery cell and causing deformation or damage.

[0011] Furthermore, the height of the protrusion protruding from the substrate surface is 0.3 to 0.5 mm. Setting the height of the protrusion within this range ensures that the base plate provides sufficient support for the battery cell, while also preventing the protrusion from occupying too much internal space of the housing due to excessive height.

[0012] Furthermore, the diameter of the recess and the protrusion is 5-10 mm. Setting the diameter of the recess and the protrusion within this range ensures that there is a suitable contact area between the base plate and the battery cell and the bottom of the housing to stably support the battery cell and avoid uneven force on the bottom of the battery cell, while also preventing the protrusion from affecting the flow of electrolyte due to excessive size.

[0013] The second aspect of this utility model discloses a square battery, comprising:

[0014] A housing having a receiving cavity, the housing including a side and a bottom, the connecting corners of the side and the bottom being rounded;

[0015] The battery cell, wherein the battery cell is disposed within the receiving cavity; and

[0016] The bottom support plate mentioned in the first aspect is disposed between the bottom of the battery cell and the casing;

[0017] A cover assembly connected to the housing to close the receiving cavity.

[0018] Furthermore, the base plate is rectangular, with its length direction corresponding to the length direction of the housing and its width direction corresponding to the width direction of the housing. The length L of the rectangle satisfies: L1 - R ≥ L, and the width W of the rectangle satisfies: W1 - R ≥ W, where L1 is the length of the housing, W1 is the width of the housing, and R is the diameter of the arc corresponding to the rounded corner. If the width or length of the base plate is too wide or too long, the edge of the base plate will abut against the rounded corner, preventing the base plate from contacting the bottom of the housing and thus making it unable to effectively support the battery cell.

[0019] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art:

[0020] 1. By providing protrusions on the substrate, this application enables more space between the base plate and the battery casing, which not only supports the battery cell but also increases the storage and flow space for the electrolyte, thereby improving the wetting effect of the electrolyte.

[0021] 2. By providing recesses and through holes on the substrate, this application increases the electrolyte storage space while reducing its own weight, thereby improving the electrolyte flow and diffusion rate. Moreover, the bottom plate has a simple structure, is easy to manufacture, and does not require excessive space, thus improving the volumetric energy density of the battery.

[0022] To make the above and other objects, features and advantages of this utility model more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of a base plate provided in an embodiment of this application;

[0025] Figure 2 This is a cross-sectional view of a base plate provided in an embodiment of this application;

[0026] Figure 3 This is a cross-sectional view of a battery provided in an embodiment of this application;

[0027] Figure 4 This is a partial cross-sectional view of a battery provided in an embodiment of this application;

[0028] Figure 5 This is a structural diagram of a battery provided in an embodiment of this application.

[0029] The reference numerals in the above figures are as follows: 1. Substrate; 2. Recess; 3. Protrusion; 4. Through hole; 5. Housing; 6. Battery cell; 7. Cover plate; 8. Rounded corner. Detailed Implementation

[0030] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. In addition, the accompanying drawings of the present invention are only simple schematic illustrations and are not depictions based on actual dimensions, as stated in advance.

[0031] In this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "facing," "away from," "between," "closer," and "farther from," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] It should be understood that the term "or" as used herein may include, as the case may be, a combination of any one or more of the associated listed items. "More than" in this application refers to two or more (including two).

[0033] Reference Figures 1-4 This application provides a base plate, which can be located between the battery casing 5 and the battery cell 6. The base plate includes a substrate 1, with a through hole 4 along the thickness direction of the substrate 1. The substrate 1 has a recess 2 and a protrusion 3. The recess 2 is located on the side of the substrate 1 facing the battery cell 6, and the protrusion 3 is located on the side of the substrate 1 away from the recess 2. The protrusion 3 is configured to create a gap between the substrate 1 and the battery casing 5, and the gap communicates with the through hole 4.

[0034] Based on the above structure, when the bottom support is installed inside the battery housing 5, the protrusion 3 abuts against the bottom of the battery housing 5, so that a gap for electrolyte flow is formed between the substrate 1 and the bottom of the battery housing 5, while the recess 2 faces the cell 6 and can store electrolyte. This not only optimizes the internal space layout of the battery, but also improves the electrolyte wetting rate.

[0035] In some embodiments, both the substrate 1 and the protrusion 3 are insulating materials, which can be the same or different to ensure their insulation and chemical stability in the electrolyte. For example, polyethylene or polypropylene can be used.

[0036] like Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the protrusion 3 is formed by extending from the end face of the recess 2 formed on the substrate 1 in a direction away from the battery cell 6. Optionally, the protrusion 3 can be a bump or a boss, and the substrate 1, the recess 2 and the protrusion 3 can be integrally formed or the recess 2 and the protrusion 3 can be formed by pressing the substrate 1.

[0037] In this embodiment, there are multiple recesses 2 and multiple protrusions 3. The multiple recesses 2 are distributed at intervals on the surface of the substrate 1, and the positions of the multiple protrusions 3 correspond one-to-one with the positions of the multiple recesses 2.

[0038] In some embodiments, the protrusion 3 is disposed on the side of the substrate 1 away from the recess 2, and the protrusion 3 and the recess 2 are at different positions, so that the protrusion 3 and the recess 2 are spatially offset from each other.

[0039] In some embodiments, the sum of the thickness of the substrate 1 and the height of the protrusion 3 protruding from the surface of the substrate 1 is 0.5 to 0.8 mm. This is to prevent the battery cell from being squeezed or the base plate from being too thick, which would reduce the effective space inside the housing. Optionally, the height of the protrusion 3 protruding from the surface of the substrate 1 is 0.3 to 0.5 mm.

[0040] In some embodiments, the diameter of the recess 2 and the protrusion 3 is 5 to 10 mm. This reduces the thickness of the substrate 1 while providing support for the battery cell 6 from the bottom support, thus preventing uneven stress on the bottom of the battery cell 6.

[0041] Multiple through holes 4 are provided, and the multiple through holes 4 are distributed at intervals on the surface of the substrate 1. The distribution pattern can be uniform or non-uniform. Optionally, the diameter of the through holes 4 is 3 to 8 mm, which facilitates positioning during the assembly process of the automated production line and reduces the weight of the base plate.

[0042] Reference Figure 3 and Figure 5This application also provides a square battery, including a housing 5, a battery cell 6 disposed within the housing 5, a cover plate assembly 7 connected to the housing 5, and a bottom support plate as described in the above embodiment. The bottom support plate is disposed between the battery cell 6 and the bottom of the housing 5. The housing 5 has a receiving cavity, and the cover plate assembly 7 is capable of closing the receiving cavity. The housing 5 includes a side and a bottom, and a rounded corner 8 is formed at the connecting corner of the side and the bottom. The battery cell 6 is disposed within the receiving cavity of the housing 5.

[0043] In this embodiment, the bottom support piece is rectangular. The length direction of the rectangle corresponds to the length direction of the shell 5, and the width direction of the rectangle corresponds to the width direction of the shell 5. The length L of the rectangle satisfies: L1-R≥L, and the width W of the rectangle satisfies: W1-R≥W, where L1 is the length of the shell, W1 is the width of the shell, and R is the diameter of the arc corresponding to the rounded corner.

[0044] Optionally, the length of the rectangle L = L1 - R and the width of the rectangle W = W1 - R, so as to avoid the edge of the substrate 1 contacting the rounded corner 8 when the bottom support is too wide or too long, so that the protrusion 3 cannot abut against the bottom of the housing 5, and to avoid uneven force on the bottom of the cell 6 when the bottom support is too narrow or too short.

[0045] This utility model uses specific embodiments to illustrate the principle and implementation of the utility model. The above description of the embodiments is only for the purpose of helping to understand the method and core idea of ​​the utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​the utility model. Therefore, the content of this specification should not be construed as a limitation of the utility model.

Claims

1. A base support plate, wherein the base support plate can be located between the battery casing and the battery cell, characterized in that, The device includes a substrate, which has a through hole along its thickness direction, a recess on the side of the substrate facing the battery cell, and a protrusion on the side of the substrate away from the recess. The protrusion is configured to create a gap between the substrate and the battery casing, and the gap communicates with the through hole.

2. The base support plate according to claim 1, characterized in that, The protrusion is formed by extending from the end of the substrate that forms the recess in a direction away from the battery cell.

3. A base plate according to claim 2, characterized in that, Both the recessed portion and the protrusion are provided in multiples, with the multiple recessed portions distributed at intervals on the surface of the substrate, and the positions of the multiple protrusions corresponding one-to-one with the positions of the multiple recessed portions.

4. A base support plate according to claim 1, characterized in that, The through holes are provided in multiple locations, and the multiple through holes are distributed at intervals on the surface of the substrate.

5. A base support plate according to claim 1, characterized in that, The sum of the thickness of the substrate and the height of the protrusion protruding from the surface of the substrate is 0.5 to 0.8 mm.

6. A base support plate according to claim 5, characterized in that, The height of the protrusion protruding from the substrate surface is 0.3 to 0.5 mm.

7. A base support plate according to claim 1, characterized in that, The diameter of the recess and the protrusion is 5 to 10 mm.

8. A square battery, characterized in that, include: A housing having a receiving cavity, the housing including a side and a bottom, the connecting corners of the side and the bottom being rounded; The battery cell is disposed within the receiving cavity; as well as The bottom support plate according to any one of claims 1 to 7, wherein the bottom support plate is disposed between the battery cell and the bottom of the housing; A cover assembly connected to the housing to close the receiving cavity.

9. A square battery according to claim 8, characterized in that, The base plate is rectangular, with the length direction of the rectangle corresponding to the length direction of the shell and the width direction of the rectangle corresponding to the width direction of the shell. The length L of the rectangle satisfies: L1-R≥L, and the width W of the rectangle satisfies: W1-R≥W, where L1 is the length of the shell, W1 is the width of the shell, and R is the diameter of the arc corresponding to the rounded corner.

Images