Battery cell shell, battery cell and battery pack
By opening a heat dissipation groove on the outer wall of the battery cell shell, the problem of increasing the weight and cost of the battery cell in the prior art is solved, and more efficient heat dissipation performance and housing strength are achieved.
Patent Information
- Application Number
- CN202422079885.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-08-27
AI Technical Summary
The prior art increases the heat dissipation area of the battery cell by increasing the heat dissipation stripes or ridges, resulting in an increase in the thickness of the battery cell, an increase in weight and an increase in production costs.
A battery cell housing is designed, and the outer wall is equipped with a heat dissipation groove. The relationship between the depth and wall thickness of the groove meets a specific range, and a preset safe distance is set between the groove and the edge of the housing to increase the heat dissipation area without increasing weight and cost.
It effectively increases the heat dissipation area of the battery cell, improves the heat dissipation performance and life of the battery cell, and increases the strength and assembly reliability of the shell, avoiding the increase in cost and weight.
Smart Images
Figure CN223052200U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of batteries, and particularly to a battery cell housing, a battery cell, and a battery pack. Background Art
[0002] In a battery pack / battery compartment, heat dissipation of a battery cell generally adopts a heat dissipation method in which the surface of the housing is in contact with a cooling medium (such as air, a liquid cooling plate (including a coolant), the surface of a structural member) and a heat conduction medium (such as thermal conductive silica gel, thermal conductive adhesive). Therefore, the heat dissipation effect of the battery cell is mainly affected by the cooling medium and the heat conduction medium. However, in addition to the cooling medium and the heat conduction medium, another important factor affecting the heat dissipation effect of the battery cell is the heat dissipation area of the battery cell housing. For a battery cell housing made of a flat metal plate / sheet or a metal composite film, its heat dissipation area is the apparent area of the outer surface of the housing. Under the condition that the cooling medium and the heat conduction medium are determined, the heat dissipation area of the housing affects the heat dissipation effect of the battery cell.
[0003] Currently, in order to increase the heat dissipation area of a battery cell, methods such as adding heat dissipation stripes and adding heat dissipation ribs are usually adopted to increase the outer heat dissipation area of the battery cell housing; however, this will increase the thickness of the housing, increase the weight of the entire battery cell, resulting in an increase in the cost of the battery cell and higher production costs. Summary of the Utility Model
[0004] The purpose of the present application is to provide a battery cell housing, a battery cell, and a battery pack to solve the technical problem in the prior art that by increasing stripes to increase the heat dissipation area of the battery cell, the production cost of the battery cell is increased.
[0005] To achieve the above purpose, in the first aspect of the present application, a battery cell housing is provided, which includes: an outer shell; a plurality of heat dissipation grooves are formed on the outer wall of the outer shell; the wall thickness of the outer shell is t, and the depth L of the heat dissipation groove satisfies t / 3 ≤ L ≤ t / 2, and there is a preset safety distance between the heat dissipation groove and the edge of the outer shell, and the preset safety distance is greater than or equal to 2 mm.
[0006] Preferably, the heat dissipation groove has a draft angle for outward draft, and the draft angle c satisfies 95° ≤ c ≤ 150°.
[0007] Preferably, an opening is provided at the top of the outer shell, the outer shell includes a bottom wall and a peripheral side wall provided on the bottom wall, and the heat dissipation groove is provided on the peripheral side wall or the bottom wall;
[0008] Wherein, the preset safety distance includes a first safety distance h; there is the first safety distance h between the heat dissipation groove on the peripheral side wall and the edge of the peripheral side wall, and the first safety distance h is greater than or equal to 2 mm.
[0009] Preferably, the preset safety distance further includes a second safety distance k, and there is the second safety distance k between the heat dissipation groove on the bottom wall and the edge of the bottom wall; the second safety distance k is greater than or equal to 2 millimeters.
[0010] Preferably, the outer shell is a square shell, and the peripheral side wall is enclosed by four side walls; a plurality of the heat dissipation grooves are provided on the outer walls of at least two opposite side walls and the outer wall of the bottom wall, and there is the first safety distance h between the heat dissipation groove on the side wall and the four edges of the side wall.
[0011] Preferably, both the top and bottom of the outer shell are open, the outer shell has a peripheral side wall, the heat dissipation groove is provided on the peripheral side wall, and there is the preset safety distance between the heat dissipation groove and the edge of the peripheral side wall.
[0012] Preferably, the outer shell is a square shell, and the peripheral side wall is enclosed by four side walls; a plurality of the heat dissipation grooves are provided on at least two opposite side walls, and there is the preset safety distance between the heat dissipation groove on the side wall and the four edges of the side wall.
[0013] Preferably, the shape of the heat dissipation groove is circular, oval, triangular, regular polygon or rhombic.
[0014] The second aspect of the present application further provides a battery cell, which includes the battery cell housing as described above.
[0015] The third aspect of the present application further provides a battery pack, which includes a plurality of the above-mentioned battery cells.
[0016] The beneficial effects of the battery cell housing, battery cell, and battery pack provided by the present application are as follows: heat dissipation grooves are provided on the outer wall of the outer shell, which can effectively increase the heat dissipation area of the outer shell without increasing the weight and cost of the outer shell, that is, increase the contact area with the cooling medium and heat conduction medium, improve the heat dissipation performance of the battery cell, and further improve the performance and life of the battery cell; and, by providing heat dissipation grooves, the strength of the outer shell can also be increased, the assembly adhesion and friction force between the outer shell and the heat conduction medium can be increased, and the assembly reliability of the battery cell can be increased; in addition, the wall thickness of the outer shell is t, and the depth L of the heat dissipation groove satisfies: t / 3 ≤ L ≤ t / 2, so that the depth of the heat dissipation groove does not exceed half of the wall thickness, ensuring that the wall thickness at the position where the heat dissipation groove is provided is not too thin, avoiding the outer shell from breaking at the heat dissipation groove, ensuring the sealing of the outer shell, and ensuring the strength of the outer shell; there is a preset safety distance between the heat dissipation groove and the edge of the outer shell, and the preset safety distance is greater than or equal to 2 millimeters, thus avoiding the heat dissipation groove being directly provided on the edge of the outer wall and ensuring the strength of the outer shell edge.
[0017] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. Description of the Drawings
[0018] Figure 1 is a schematic structural diagram of the cell housing according to an embodiment of the present application;
[0019] Figure 2 is Figure 1 a schematic cross-sectional structural diagram of the cell housing shown;
[0020] Figure 3 is Figure 2 an enlarged structural diagram of part A in ;
[0021] Figure 4 is a schematic structural diagram of a cylindrical cell housing according to an embodiment of the present application;
[0022] Figure 5 is a schematic structural diagram of a cylindrical double-sided cell housing according to an embodiment of the present application;
[0023] Figure 6 is a schematic structural diagram of a square double-sided cell housing according to an embodiment of the present application.
[0024] In the figure, 100 is the outer shell; 110 is the peripheral side wall; 120 is the bottom wall; 130 is the side wall; 140 is the heat dissipation groove. Detailed Description of the Embodiments
[0025] The embodiments of the present application will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for explaining the present application and should not be construed as limiting the present application.
[0026] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the present application.
[0027] In the description of this application, "several" means one or more, "multiple" means more than two. Understandings such as "greater than", "less than", and "exceeding" do not include the corresponding number, while understandings such as "above", "below", and "within" include the corresponding number. If the first and second are described, they are only used to distinguish technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.
[0028] In the description of this application, unless otherwise clearly defined, terms such as "set", "installed", and "connected" should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution.
[0029] Please refer to Figures 1 to 6 together, and now the cell housing provided by the embodiments of this application will be described.
[0030] Refer to Figures 1 to 3 As shown, the cell housing of this application includes a housing 100, which is used to load cell contents such as wound cores, electrodes, and electrolytes. A number of heat dissipation grooves 140 are provided on the outer wall of the housing 100. Among them, the wall thickness of the housing 100 is t, and the depth L of the heat dissipation grooves 140 satisfies t / 3 ≤ L ≤ t / 2. There is a preset safety distance between the heat dissipation grooves 140 and the edge of the housing 100, and the preset safety distance is greater than or equal to 2 mm.
[0031] The heat dissipation grooves 140 of the housing 100 can be formed by rolling and stamping processes. That is, without adding heat dissipation stripes or ridges to the housing 100, the heat dissipation area of the outer wall of the housing 100 can be increased. That is, without increasing the weight and cost of the housing 100, the heat dissipation area of the housing 100 is effectively increased, the contact area with the cooling medium and the heat conduction medium is increased, the heat dissipation performance of the cell is improved, and then the performance and life of the cell are improved; and, by providing the heat dissipation grooves 140, the strength of the housing 100 can be increased; finally, the heat dissipation grooves 140 can also increase the assembly adhesion and friction force between the housing 100 and the heat conduction medium, and increase the assembly reliability of the cell.
[0032] Among them, the depth L of the heat dissipation grooves 140 satisfies t / 3 ≤ L ≤ t / 2, that is, the depth of the heat dissipation grooves 140 will not be greater than half of the wall thickness, so as to ensure that the wall thickness at the position where the heat dissipation grooves 140 are provided will not be too thin, avoid the housing 100 from having holes at the heat dissipation grooves 140, ensure the sealing of the housing 100, and ensure the strength of the housing 100.
[0033] Moreover, since the edge of the outer shell 100 is the stress point of the battery cell, in order to ensure that the opened heat dissipation groove 140 does not affect the strength of the edge of the outer shell 100, a preset safety distance is provided between the heat dissipation groove 140 and the edge of the outer shell 100 to ensure that there is a preset distance between the heat dissipation groove 140 and the edge of the outer shell 100, avoiding the heat dissipation groove 140 being set at the edge of the outer shell 100, ensuring that the edge of the outer shell 100 has sufficient strength, and the preset safety distance is greater than or equal to 2 millimeters, so as to ensure that the heat dissipation groove 140 does not affect the strength of the edge of the outer shell 100.
[0034] In some embodiments of the present application, the heat dissipation groove 140 has a draft angle for outward draft, and the draft angle c satisfies 95° ≤ c ≤ 150°. The heat dissipation groove 140 is formed by stamping or rolling using a stamping die or a knurling die. Therefore, by setting the draft angle c to satisfy 95° ≤ c ≤ 150°, it is ensured that when the outer shell 100 is subjected to stamping or rolling processing, the die can better fall off from the outer shell 100, avoiding the situation where the die gets stuck in the heat dissipation groove 140 and ensuring the normal progress of the processing.
[0035] In some embodiments of the present application, referring to Figure 1 , Figure 2 , Figure 4 , the top of the outer shell 100 is provided with an opening. The outer shell 100 includes a bottom wall 120 and a peripheral side wall 110 provided on the bottom wall 120. The heat dissipation groove 140 is provided on the peripheral side wall 110 or the bottom wall 120. Among them, the preset safety distance includes a first safety distance h and a second safety distance k. There is the first safety distance h between the heat dissipation groove 140 located on the peripheral side wall 110 and the edge of the peripheral side wall 110, and there is the second safety distance k between the heat dissipation groove 140 located on the bottom wall 120 and the edge of the bottom wall 120. The outer shell 100 is a single-pass shell. The heat dissipation groove 140 can be provided not only on the outer wall of the peripheral side wall 110 but also on the outer wall of the bottom wall 120. The heat dissipation groove 140 can also be provided on the outer walls of the peripheral side wall 110 and the bottom wall 120 at the same time, which can be adjusted according to the actual situation of the battery cell. Similarly, since there is a connecting edge between the bottom wall 120 and the peripheral side wall 110, the heat dissipation groove 140 cannot be provided on the edge of the bottom wall 120 or the edge of the peripheral side wall 110. Therefore, by reserving the first safety distance h and the second safety distance k, it is ensured that the heat dissipation groove 140 can be misaligned with the edge of the bottom wall 120 or the edge of the peripheral side wall 110, avoiding the heat dissipation groove 140 being directly provided on the edge of the bottom wall 120 or the edge of the peripheral side wall 110 and ensuring the strength of the edge of the outer shell 100.
[0036] Preferably, both the first safety distance h and the second safety distance k are greater than or equal to 2 millimeters. The first safety distance h and the second safety distance k may not be equal or may be equal, and the magnitudes of the first safety distance h and the second safety distance k can be adjusted according to actual situations. The minimum values of the first safety distance h and the second safety distance k are 2 millimeters, which can ensure that the heat dissipation grooves 140 do not affect the strength of the edge of the peripheral side wall 110 or the bottom wall 120.
[0037] In some embodiments of the present application, the edge of the bottom wall 120 and the edge of the peripheral side wall 110 can be connected by a fillet, that is, the edge of the bottom wall 120 is a fillet, and the edge where the peripheral side wall 110 is connected to the bottom wall 120 is also a fillet. Then, there is a preset safety distance between the heat dissipation grooves 140 and the fillets, ensuring that the heat dissipation grooves 140 are not arranged on the fillets.
[0038] In some embodiments of the present application, referring to Figures 1 to 3 , the housing 100 is a square shell, and the peripheral side wall 110 is surrounded by four side walls 130; a plurality of the heat dissipation grooves 140 are provided on the outer walls of at least two opposite side walls 130 and the outer wall of the bottom wall 120. There is the first safety distance h between the heat dissipation grooves 140 located on the side wall 130 and the four edges of the side wall 130. The heat dissipation grooves 140 can be selected for the installation position according to the positions of the battery cell, the cooling medium, and the heat conduction medium. It is preferred to select the outer wall where the battery cell is in direct contact with the cooling medium and the heat conduction medium. Therefore, they can be provided on the outer walls of the bottom wall 120 and at least two opposite side walls 130. There is the first safety distance h between each heat dissipation groove 140 on the side wall 130 and the edge, ensuring that the heat dissipation grooves 140 are not arranged on the edge of the peripheral side wall 110.
[0039] In some embodiments of the present application, the housing 100 is a single-pass cylindrical battery cell housing, as Figure 4 shown. The peripheral side wall 110 and the bottom wall 120 of the housing 100 both have heat dissipation grooves 140. There is the first safety distance h between the heat dissipation grooves 140 located on the peripheral side wall 110 and the edge of the peripheral side wall 110, and there is the second safety distance k between the heat dissipation grooves 140 located on the bottom wall 120 and the edge of the bottom wall 120. Then, the heat dissipation grooves 140 are arranged to avoid the edges, ensuring the strength of the edge of the housing 100.
[0040] Preferably, both the first safety distance h and the second safety distance k are greater than or equal to 2 millimeters. The first safety distance h and the second safety distance k may be unequal or equal, and the magnitudes of the first safety distance h and the second safety distance k can be adjusted according to the actual situation. The minimum values of the first safety distance h and the second safety distance k are 2 millimeters, so as to ensure that the heat dissipation grooves 140 will not affect the strength of the edge of the peripheral side wall 110 or the bottom wall 120.
[0041] In some embodiments of the present application, with reference to Figure 5 and Figure 6 , both the top and the bottom of the housing 100 are open, the housing 100 has a peripheral side wall 110, the heat dissipation grooves 140 are arranged on the peripheral side wall 110, and there is a preset safety distance between the heat dissipation grooves 140 and the edge of the peripheral side wall 110, and the preset safety distance is greater than or equal to 2 millimeters. That is, the housing 100 is a double-pass housing with only the peripheral side wall 110. Therefore, there is a preset safety distance between the heat dissipation grooves 140 and the edge of the peripheral side wall 110, which can ensure the strength of the edge of the entire housing 100. Moreover, the minimum value of the preset safety distance is 2 millimeters, so as to ensure that the heat dissipation grooves 140 will not affect the strength of the edge of the peripheral side wall 110.
[0042] Among them, as Figure 6 shown, the housing 100 is a square housing, and the peripheral side wall 110 is surrounded by four side walls 130; multiple heat dissipation grooves 140 are arranged on at least one pair of opposite side walls 130, and there is a preset safety distance between the heat dissipation grooves 140 on the side wall 130 and the four edges of the side wall 130. The heat dissipation grooves 140 can be arranged according to the positions of the battery cell, the cooling medium, and the heat conduction medium. It is preferred to select the outer wall where the battery cell is in direct contact with the cooling medium and the heat conduction medium. Therefore, it can be arranged on the outer walls of at least one pair of opposite side walls 130. There is a preset safety distance between each heat dissipation groove 140 on the side wall 130 and the edge, ensuring that the heat dissipation grooves 140 are not arranged on the edge of the peripheral side wall 110.
[0043] Among them, as Figure 5 shown, the housing 100 is a single-pass cylindrical battery cell housing, the peripheral side wall 110 of the housing 100 has heat dissipation grooves 140, and there is a preset safety distance between the heat dissipation grooves 140 on the peripheral side wall 110 and the edge of the peripheral side wall 110, so that the heat dissipation grooves 140 are arranged avoiding the edge, ensuring the strength of the edge of the housing 100.
[0044] In some embodiments of the present application, the shape of the heat dissipation groove 140 is circular, oval, triangular, regular polygon or rhombic. In addition, the shape of the heat dissipation groove 140 can also be set to other shapes such as slot-shaped, waist-shaped, etc. And, to ensure the service life of the stamping die or knurling die and the strength of the housing 100, the heat dissipation groove 140 should not be provided with sharp edges or corners, and arc or fillet transitions are used.
[0045] In some embodiments of the present application, the inner wall of the housing 100 is a smooth wall surface, which can enable the housing 100 to better carry contents such as electrodes and winding cores, facilitating assembly.
[0046] The present application also provides a battery cell, which includes the above-mentioned battery cell housing. The battery cell housing can be loaded with contents such as winding cores and electrodes. The housing 100 of the battery cell housing is provided with a heat dissipation groove 140, that is, without adding heat dissipation stripes or ribs on the housing 100, the heat dissipation area of the outer wall of the housing 100 can be increased. That is, on the basis of not increasing the weight and cost of the housing 100, the heat dissipation area of the housing 100 is effectively increased, the contact area with the cooling medium and the heat conduction medium is increased, the heat dissipation performance of the battery cell is improved, and further the performance and service life of the battery cell are improved; and, by providing the heat dissipation groove 140, the strength of the housing 100 can be increased; finally, the heat dissipation groove 140 can also increase the assembly adhesion and friction force between the housing 100 and the heat conduction medium, increasing the assembly reliability of the battery cell.
[0047] The present application also provides a battery pack, which includes a plurality of the above-mentioned battery cells. The plurality of battery cells are electrically connected to form a battery pack. The housing 100 of each battery cell is provided with a heat dissipation groove 140, that is, without adding heat dissipation stripes or ribs on the housing 100, the heat dissipation area of the outer wall of the housing 100 can be increased. That is, on the basis of not increasing the weight and cost of the housing 100, the heat dissipation area of the housing 100 is effectively increased, the contact area with the cooling medium and the heat conduction medium is increased, the heat dissipation performance of the battery cell is improved, and further the performance and service life of the battery cell are improved; and, by providing the heat dissipation groove 140, the strength of the housing 100 can be increased; finally, the heat dissipation groove 140 can also increase the assembly adhesion and friction force between the housing 100 and the heat conduction medium, increasing the assembly reliability of the battery cell.
[0048] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present application, several improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection scope of the present application.
Claims
1. A battery cell casing, characterized in that: Including housing; The outer wall of the shell is provided with a plurality of heat dissipation grooves; the wall thickness of the shell is t, the depth L of the heat dissipation grooves satisfies: t / 3≤L≤t / 2, and there is a preset safety distance between the heat dissipation grooves and the edge of the shell, and the preset safety distance is greater than or equal to 2 mm.
2. The battery cell casing according to claim 1, characterized in that: The heat dissipation groove has an outward draft angle, and the draft angle c satisfies: 95°≤c≤150°.
3. The battery cell casing according to claim 1 or 2, characterized in that: The top of the housing is provided with an opening, the housing comprises a bottom wall and a peripheral side wall provided on the bottom wall, and the heat dissipation groove is provided on the peripheral side wall or the bottom wall; Wherein, the preset safety distance includes a first safety distance h; the first safety distance h is between the heat dissipation groove on the peripheral side wall and the edge of the peripheral side wall; the first safety distance h is greater than or equal to 2 mm.
4. The battery cell casing according to claim 3, characterized in that: The preset safety distance also includes a second safety distance k, and the second safety distance k is between the heat dissipation groove on the bottom wall and the edge of the bottom wall; the second safety distance k is greater than or equal to 2 mm.
5. The battery cell casing according to claim 3, characterized in that: The outer shell is a square shell, and the peripheral side wall is surrounded by four side walls; the outer walls of at least two opposite side walls and the outer wall of the bottom wall are provided with a plurality of the heat dissipation grooves, and the heat dissipation grooves on the side wall have the first safety distance h from the four edges of the side wall.
6. The battery cell casing according to claim 1 or 2, characterized in that: The top and the bottom of the shell are both open, the shell has a peripheral side wall, the heat dissipation groove is arranged on the peripheral side wall, and there is the preset safety distance between the heat dissipation groove and the edge of the peripheral side wall.
7. The battery cell casing according to claim 6, characterized in that: The outer shell is a square shell, and the peripheral side wall is surrounded by four side walls; at least two opposite side walls are provided with a plurality of the heat dissipation grooves, and the heat dissipation grooves on the side wall have the preset safety distance from the four edges of the side wall.
8. The battery cell casing according to claim 1 or 2, characterized in that: The heat dissipation groove is in a shape of a circle, an ellipse, a triangle, a regular polygon or a rhombus.
9. A battery cell, characterized in that: It comprises the battery cell casing according to any one of claims 1 to 8.
10. A battery pack, characterized in that: It comprises a plurality of battery cells as claimed in claim 9.