Battery shell, single battery, battery pack and vehicle

Abstract

The utility model relates to a battery shell, a single battery, a battery pack and a vehicle, the battery shell is a box body with an opening at the top, at least one side surface of the box body is provided with a concave area which is concave towards the inside of the box body, and the outer surface of the side surface where the concave area is located is divided into at least two convex areas by the concave area; or at least one part of the convex area is positioned on the inner side of the concave area. According to the utility model, not only is the rigidity of the shell improved, but also the stress of the whole shell is more uniform, and the peripheral edge of the shell can be prevented from being deformed.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle batteries, and specifically relates to a battery shell, a single battery, a battery pack and a vehicle. Background Art

[0002] The rapid development of new energy vehicles has put forward higher requirements for lithium batteries. In the existing square shell battery technology, the four sides of the shell are usually stretched into smooth planes. In particular, when the battery size exceeds a certain value, the side of the shell will be slightly deformed due to its own stress, resulting in a decrease in the matching accuracy with the top cover assembly. At the same time, the current square shell batteries generally have a group margin design, and the shell and internal components cannot form an effective constraint. On the one hand, this causes the heat generated inside to be unable to be effectively transferred out. At the same time, due to insufficient constraints on the internal components, the pole core will shake between the inner cavity of the shell, and there is a risk of loosening the connection of the pole ear.

[0003] For example, patent document CN217903247U provides a square shell battery cell, a battery cell stack and a battery pack, which specifically includes an inwardly recessed area on the side wall of the shell along the stacking direction of the pole pieces, and the inner surface of the recess is in adaptive contact with the surface of the electrode assembly, so as to reduce the expansion stress generated by the internal pole core during use. However, when the shell is welded, especially when the battery shell component is composed of a thin plate, since the side of the shell is nearly the entire surface and is completely recessed, the edge of the shell and the top cover will be deformed due to stress, causing a gap in the weld. At the same time, the heat dissipation at the battery level is usually carried out on the surface of the shell, but the shell is not directly in contact with the inside of the pole core, and the heat conduction effect is not ideal.

[0004] Therefore, it is necessary to develop a new battery case, a single cell, a battery pack and a vehicle. Summary of the invention

[0005] The purpose of the utility model is to provide a battery shell, a single cell, a battery pack and a vehicle, which can not only improve the rigidity of the shell, but also make the force of the entire shell more uniform, so there will be no problem of deformation of the surrounding edges.

[0006] In the first aspect, the utility model provides a battery case, which is a box with an open top, and at least one side of the box is provided with a recessed area recessed into the box, and the recessed area divides the outer surface of the side where the recessed area is located into at least two raised areas, or at least a portion of the raised area is located on the inner side of the recessed area.

[0007] Optionally, the box body has four side surfaces, and the recessed areas are provided on one set of opposite side surfaces; the inner surfaces of the recessed areas on the two side surfaces are in contact with the surface of the pole core, thereby better limiting the movement of the pole core in the internal space of the shell.

[0008] Optionally, the box body includes two relatively large side surfaces and two relatively small side surfaces, and the recessed area is provided on both of the two relatively large side surfaces. Generally speaking, the large side surfaces of the box body are more likely to deform during use than the small side surfaces, and providing the recessed area on the large side surfaces can better solve the problem of shell deformation.

[0009] Optionally, the recessed areas are arranged bilaterally symmetrically on the large side surface. Setting the recessed area in the middle of the side surface can make the force on the side surface more uniform, and at the same time, the effect of improving the rigidity of the shell is more obvious, so it can well ensure that the shell is not easily deformed.

[0010] Optionally, the recessed area is a circular ring structure, the outer diameter of the circular ring structure is smaller than the height of the large side surface, and the ratio of the inner diameter of the circular ring structure to the height of the large side surface is less than or equal to one-half and greater than or equal to one-quarter. If the area of ​​the recessed area is too small, it cannot play a role in improving the rigidity of the shell, and at the same time, the contact area with the pole core is too small, which may also cause damage to the pole core. If the area of ​​the recessed area is too large, it is equivalent to a large area on the side being recessed, and the stress on the shell during use cannot be effectively released, and it is still easy to cause deformation of the edges around the shell. The utility model sets the recessed area as a circular ring structure, and the circular ring structure can make the entire force more uniform, and there will be no problem of deformation of the edges around. At the same time, the area of ​​the recessed area is appropriately set, so that there is enough plane contact area between the shell and the pole core, which can not only fix and position the pole core, but also will not cause damage to the pole core. In addition, it can also effectively improve the rigidity of the shell.

[0011] Optionally, the recessed area is a square ring structure, and the four outer edges of the square ring structure are parallel to the four edges of the large side surface, and the distance between the outer edge of the square ring structure and the edge of the large side surface is greater than the distance between the outer edge and the inner edge of the square ring structure. The utility model sets the recessed area as a square ring structure, and the square ring structure can make the entire force more uniform. The four outer edges of the square ring structure are parallel to the four edges of the large side surface, so that the force can be better dispersed and the problem of deformation of the surrounding edges can be avoided. At the same time, the area of ​​the recessed area is appropriately set so that there is enough plane contact area between the shell and the pole core, which can not only fix and position the pole core, but also will not cause damage to the pole core. In addition, the rigidity of the shell can also be effectively improved. In addition, the square ring structure has good processability.

[0012] Optionally, the recessed area extends to be flush with the opening on one side close to the box opening, and a heat dissipation pipe adapted to the recessed area is provided in the recessed area. In the utility model, the heat dissipation pipe is installed in the recessed area, which can reduce the space occupied by the heat dissipation pipe, thereby improving the volume energy density of the battery. At the same time, the inner surface of the recessed area is in direct contact with the pole core, and the heat dissipation pipe can transfer the heat inside the battery faster, thereby improving the safety of the battery.

[0013] Optionally, the recessed area divides the outer surface of the side where it is located into three raised areas, and the recessed area surrounds the periphery of two of the raised areas. Among them, the raised area near the opening position is mainly used to position and fix the installation of the heat pipe, and also plays a role in improving the rigidity of the shell.

[0014] In the second aspect, a single cell battery described in the utility model includes a battery shell, a top cover and a pole core, the battery shell and the top cover are sealed and connected to form a closed space, the pole core is installed in the closed space, including a battery shell adopting the battery shell described in the utility model.

[0015] In a third aspect, a battery pack described in the present invention adopts the single cell described in the present invention.

[0016] In a fourth aspect, a vehicle described in the present invention adopts the battery pack described in the present invention.

[0017] Beneficial effects of the utility model: The utility model sets a recessed area on the side of the box, and the recessed area divides the outer surface of the side where it is located into at least two raised areas, or at least a part of the raised area is located on the inner side of the recessed area. This shape of the recessed area can not only improve the rigidity of the shell, but also make the force of the entire shell more uniform, so it can avoid the problem of deformation of the edges around the shell. The utility model is directly connected to the pole core through the recessed area, and there is enough planar contact area between the shell and the pole core, which can not only fix and position the pole core, but also will not cause damage to the pole core, and at the same time can quickly export the heat of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery housing and the top cover of the first embodiment of the present application;

[0019] Figure 2 This is a schematic diagram of the front view of the battery housing and the top cover of the first embodiment of the present application;

[0020] Figure 3 A cross-sectional view of a battery housing and a top cover of Embodiment 1 of the present application;

[0021] Figure 4This is a schematic diagram of the three-dimensional structure of the battery housing and the top cover of the second embodiment of the present application;

[0022] Figure 5 This is a schematic diagram of the separate structure of the battery housing and the heat dissipation pipe of the third embodiment of the present application;

[0023] Figure 6 This is a schematic diagram of the separate structure of the battery housing and the heat dissipation pipe of the third embodiment of the present application;

[0024] Figure 7 This is a front view of the battery housing and the heat dissipation tube of the fourth embodiment of the present application;

[0025] Figure 8 This is a schematic diagram of the top structure of the battery top cover of the fourth embodiment of the present application;

[0026] Fig. 9 This is a schematic diagram of the front view of the battery housing and top cover of Example 5 of the present application;

[0027] Among them: 1-shell; 11-raised area; 12-recessed area; 13-welding part; 2-top cover; 21-notch part; 3-pole core; 4-heat dissipation pipe; 41-heat dissipation pipe outlet. DETAILED DESCRIPTION

[0028] The following will refer to the accompanying drawings and preferred embodiments to illustrate the implementation of the technical solution of the utility model. Those skilled in the art can easily understand other advantages and effects of the utility model from the contents disclosed in this specification. The utility model can also be implemented or applied through other different specific implementations, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the utility model. It should be understood that the preferred embodiments are only for illustrating the utility model, not for limiting the scope of protection of the utility model.

[0029] In the embodiment of the present application, a battery case is provided, wherein the battery case 1 is a box body with an open top, and at least one side of the box body is provided with a recessed area 12 recessed into the inside of the box body, and the recessed area 12 divides the outer surface of the side where it is located into at least two raised areas 11 (see Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 6 ), or at least a portion of the raised area 11 is located inside the recessed area 12 (see Fig. 9 ).

[0030] like Figure 3As shown, in a possible embodiment, the box has four sides, and a set of opposite sides are each provided with a recessed area 12. The inner surfaces of the recessed areas 12 on the two sides are in contact with the surface of the pole core 3, so that the pole core 3 can be better restricted from moving in the inner space of the housing 1.

[0031] like Figures 1 to 8 As shown, in a possible embodiment, the box body includes two relatively large side surfaces and two relatively small side surfaces, and both of the two large side surfaces are provided with a recessed area 12. Generally speaking, the large side surfaces of the box body are more likely to deform during assembly and use than the small side surfaces, and providing the recessed area 12 on the large side surfaces can better solve the problem of deformation of the housing 1.

[0032] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6 and Figure 8 As shown, in a possible embodiment, the recessed area 12 is arranged symmetrically on the large side surface. The recessed area 12 is arranged in the middle of the large side surface, so that the force on the large side surface can be more uniform, and the effect of improving the rigidity of the shell 1 is more obvious, so that the shell 1 can be well ensured not to be easily deformed.

[0033] like Figures 1 to 8 As shown, in an embodiment of the present application, a single cell battery includes a battery case 1, a top cover 2 and a pole core 3. The battery case 1 and the top cover 2 are sealed and connected to form an enclosed space. The pole core 3 is installed in the enclosed space, including the battery case 1 using the battery case 1 in the embodiment of the present application.

[0034] like Figure 1 and Figure 2As shown, in a possible embodiment, the recessed area 12 is a circular ring structure, the outer diameter (R2) of the circular ring structure is less than the height (H) of the large side, and the ratio of the inner diameter (R1) of the circular ring structure to the height of the large side is less than or equal to one-half and greater than or equal to one-quarter. If the area of ​​the recessed area 12 is too small, it cannot play a role in improving the rigidity of the shell 1, and the contact area with the pole core 3 is too small, which may also cause damage to the pole core 3. If the area of ​​the recessed area 12 is too large, it is equivalent to a large area on the side being sunken, and the stress on the shell 1 during use cannot be effectively released, and it is still easy to cause deformation of the edges around the shell 1. In the embodiment of the present application, by setting the recessed area 12 as a circular ring structure, the circular ring structure can effectively disperse the stress of the shell 1 and improve the rigidity of the shell 1, and reduce the deformation of the welding portion 13 where the shell 1 is connected to the top cover 2, thereby avoiding welding failure. In addition, the circular ring structure can make the force on the entire shell 1 more uniform during use, and is more conducive to the dispersion of stress, and it is not easy to cause deformation of the edges around the shell 1 during use. In addition, the area of ​​the recessed region 12 is appropriately set so that there is a sufficient planar contact area between the shell 1 and the pole core 3, which can well fix and position the pole core 3 without causing damage to the pole core 3.

[0035] like Figure 4 As shown, in a possible embodiment, the recessed area 12 is a square ring structure, and the four outer edges of the square ring structure are parallel to the four edges of the large side surface, and the distance between the outer edge of the square ring structure and the edge of the large side surface is greater than the distance between the outer edge and the inner edge of the square ring structure. In the embodiment of the present application, by setting the recessed area 12 as a square ring structure, the square ring structure can make the entire force more uniform, and the four outer edges of the square ring structure are parallel to the four edges of the large side surface, so that the force can be better dispersed, avoiding the problem of deformation of the edges around the shell. At the same time, the area of ​​the recessed area 12 is set appropriately, so that there is enough plane contact area between the shell 1 and the pole core 3, which can not only fix and position the pole core 3, but also will not cause damage to the pole core 3. In addition, it can also effectively improve the rigidity of the shell 1. In addition, the processing technology of the square ring structure is good.

[0036] like Figures 5 to 7As shown, in a possible embodiment, the recessed area 12 extends to be flush with the opening on one side close to the opening of the box body, and a heat dissipation pipe 4 (such as a liquid cooling pipe) adapted to the recessed area 12 is provided in the recessed area 12. Installing the heat dissipation pipe 4 in the recessed area 12 can reduce the space occupied by the heat dissipation pipe 4, thereby improving the volume energy density of the battery. At the same time, the inner surface of the recessed area 12 is in direct contact with the pole core 3, and the heat dissipation pipe 4 can transfer the internal heat of the battery faster, thereby improving the safety of the battery. Among them, the raised area 11 located in the recessed area 12 not only has the function of improving the rigidity of the shell, but also can play a role in positioning and fixing the installation of the heat dissipation pipe 4.

[0037] like Figure 5 , Figure 6 and Figure 7 As shown, it should be noted that in order to install the heat dissipation pipe 4 on the housing 1, a corresponding notch portion 21 needs to be provided on the top cover 2, and the width of the notch portion 21 on the top cover 2 is the same as the width of the recessed area 12 at the opening, so as to facilitate the installation of the heat dissipation pipe 4. The notch portion 21 and the recessed area 12 together constitute a channel for accommodating the heat dissipation pipe 4. The heat dissipation pipe 4 has two heat dissipation pipe openings 41, the heat dissipation pipe 4 is in contact with the surface of the recessed area 12, and the heat dissipation pipe 4 is positioned and spatially restricted by the inner contour and outer contour of the recessed area.

[0038] like Figure 6 and Figure 7 As shown, in a possible embodiment, the recessed area 12 divides the outer surface of the side where it is located into three raised areas 11, and the recessed area 12 surrounds the outer periphery of two of the raised areas 11. Figure 6 The raised area 11 near the opening is mainly used to position and fix the heat dissipation pipe 4, and also serves to improve the rigidity of the shell.

[0039] In an embodiment of the present application, a battery pack uses a single cell as described in the embodiment of the present application.

[0040] In an embodiment of the present application, a vehicle adopts the battery pack as described in the embodiment of the present application.

[0041] The above-mentioned embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited by the above-mentioned embodiments. Any other changes, modifications, substitutions, combinations and simplifications made without departing from the spirit and principle of the present invention shall be equivalent replacement modes and shall be included in the protection scope of the present invention.

Claims

1. A battery housing, the battery housing (1) being a box with an open top, characterized in that: At least one side surface of the box body is provided with a recessed area (12) recessed toward the inside of the box body, and the recessed area (12) divides the outer surface of the side surface where the recessed area (12) is located into at least two raised areas (11), or at least a part of the raised area (11) is located inside the recessed area (12).

2. The battery housing according to claim 1, characterized in that: The box body has four side surfaces, and the recessed areas (12) are provided on a group of opposite side surfaces.

3. The battery housing according to claim 2, characterized in that: The box body comprises two large side surfaces that are arranged opposite to each other and two small side surfaces that are arranged opposite to each other, and the recessed area (12) is provided on both of the large side surfaces.

4. The battery housing according to claim 3, characterized in that: The recessed areas (12) are arranged on the large side surface in a bilaterally symmetrical manner.

5. The battery housing according to claim 4, characterized in that: The recessed area (12) is a circular ring structure, the outer diameter of the circular ring structure is smaller than the height of the large side surface, and the ratio of the inner diameter of the circular ring structure to the height of the large side surface is less than or equal to one half and greater than or equal to one quarter.

6. The battery housing according to claim 4, characterized in that: The recessed area (12) is a square ring structure, the four outer edges of the square ring structure are parallel to the four edges of the large side surface on which they are located, and the distance between the outer edge of the square ring structure and the edge of the large side surface on which they are located is greater than the distance between the outer edge and the inner edge of the square ring structure.

7. The battery housing according to claim 4, characterized in that: The recessed area (12) extends to be flush with the opening on a side close to the box body opening, and a heat dissipation pipe (4) adapted to the recessed area (12) is provided in the recessed area (12).

8. The battery casing according to claim 7, characterized in that: The recessed area (12) divides the outer surface of the side on which it is located into three raised areas (11), and the recessed area (12) surrounds the periphery of two of the raised areas (11).

9. A single cell battery, comprising a battery housing (1), a top cover (2) and a pole core (3), wherein the battery housing (1) and the top cover (2) are sealed and connected to form a closed space, and the pole core (3) is installed in the closed space, characterized in that: The battery housing (1) comprises a battery housing (1) as claimed in any one of claims 1 to 8.

10. A battery pack, characterized in that: A single cell as claimed in claim 9 is used.

11. A vehicle, characterized in that: A battery pack as claimed in claim 10 is used.

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