Battery cell shell, battery cell and battery cell group

Abstract

The utility model discloses a battery cell shell, a battery cell and a battery cell group, and relates to the technical field of batteries. The battery cell shell comprises two first plate bodies and two second plate bodies, and the two first plate bodies and the two second plate bodies define an accommodating cavity for accommodating the electrode assembly; the area of the second plate body is smaller than that of the first plate body; the outer surface of the second plate body is provided with at least one groove formed by recessing the second plate body towards one side of the accommodating cavity, so that the structural strength and rigidity of the second plate body are enhanced, the deformation resistance of the battery cell shell in the use process can be effectively improved, and the overall stability of the battery cell shell is enhanced.

Description

Technical Field

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

[0002] The battery cell includes a housing, an electrode assembly disposed within the housing, and an end cap. The housing has a receiving cavity and an opening communicating with the receiving cavity, and the end cap is used to close the opening of the housing. The inner and outer surfaces of the battery cell housing are flat surfaces. During use, due to the internal gas generation of the battery cell and the expansion of the electrode assembly, the battery cell housing will expand and deform, thereby squeezing system components such as the liquid cooling plate. Utility Model Content

[0003] The purpose of this application is to provide a battery cell housing, a battery cell, and a battery cell assembly to solve the technical problem of deformation of the battery cell housing due to expansion.

[0004] In a first aspect, this application provides a battery cell housing, including two first plates and two second plates, the two first plates and the two second plates forming a receiving cavity for accommodating an electrode assembly; the area of ​​the second plates is smaller than the area of ​​the first plates; the outer surface of the second plates has at least one groove formed by the second plates recessing into one side of the receiving cavity.

[0005] In some embodiments, the groove extends through both first plates.

[0006] In some embodiments, the second plate includes a first part, a second part, and a third part, the first part and the second part being spaced apart, and the third part being connected between the first part and the second part to form a groove on the outer surface of the second plate.

[0007] In some embodiments, an angle is provided between the second part and the third part, and the angle is greater than or equal to 90°.

[0008] In some embodiments, the height of the groove is less than or equal to 2 mm.

[0009] In some embodiments, the number of grooves is two or more, and the two or more grooves are spaced apart.

[0010] In some embodiments, the length of the battery cell casing ranges from 300 to 700 mm, the height ranges from 100 to 200 mm, and the thickness is greater than 10 mm.

[0011] Secondly, this application also provides a battery cell, including the aforementioned battery cell housing, the battery cell housing having an opening communicating with a receiving cavity; an end cap, the end cap being connected to the battery cell housing and closing the opening; and an electrode assembly, the electrode assembly being disposed within the receiving cavity.

[0012] In some embodiments, the battery cell further includes: a terminal post disposed on an end cap; and an insulating film covering the outer surface of the electrode assembly.

[0013] Thirdly, this application also provides a battery cell assembly, including the aforementioned battery cell; and a liquid cooling plate disposed on the battery cell, wherein the width of the groove in the battery cell housing is the same as the width of the liquid cooling plate.

[0014] The technical advantage of this application is that it provides a battery cell housing, a battery cell, and a battery cell assembly. The battery cell housing includes two first plates and two second plates, which together form a receiving cavity for accommodating an electrode assembly. The area of ​​the second plates is smaller than that of the first plates. The second plates have at least one groove formed by recessing the second plates into one side of the receiving cavity to enhance the structural strength and rigidity of the second plates, thereby effectively improving the deformation resistance of the battery cell housing during use and enhancing its overall stability. Attached Figure Description

[0015] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic diagram of the battery cell housing provided in an embodiment of this application.

[0017] Figure 2 A schematic diagram of the battery cell structure provided in the embodiments of this application. Figure 1 .

[0018] Figure 3 A schematic diagram of the battery cell structure provided in the embodiments of this application. Figure 2 .

[0019] The components in the attached diagram are labeled as follows:

[0020] 101 - Receiving cavity; 102 - Opening;

[0021] 11-Cell casing; 111-First plate; 112-Second plate; 1121-Protrusion; 1122-Groove;

[0022] 1211 - Part 1; 1212 - Part 2; 1213 - Part 3;

[0023] 12-End cap; 13-Electrode assembly; 14-Electrode post; 15-Insulating film;

[0024] 131 - Core; 132 - Tab; 100 - Cell. Detailed Implementation

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are used only for the convenience of describing this application and simplifying the description, and 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 application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0027] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" 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 mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0028] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] The following disclosure provides many different embodiments or examples for implementing different structures of this application. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the scope of this application. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, various specific examples of processes and materials are provided in this application, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0030] To address the technical problem of battery cell casing expansion and deformation caused by internal gas generation within the battery cell and the expansion of the electrode assembly, this application provides a battery cell casing comprising two first plates and two second plates, which together form a receiving cavity for accommodating the electrode assembly. The area of ​​each second plate is smaller than that of the first plates. The outer surface of each second plate has at least one groove formed by the second plate recessing into one side of the receiving cavity to enhance the structural strength and rigidity of the second plate, effectively improving the deformation resistance of the battery cell casing during use and enhancing its overall stability. A detailed description follows.

[0031] This application provides a battery cell housing 11, such as Figures 1 to 3 As shown, the battery cell housing 11 includes two first plates 111 and two second plates 112. The two first plates 111 are disposed opposite each other in the length direction of the battery cell housing 11, and the two second plates 112 are disposed opposite each other in the height direction of the battery cell housing 11. The second plates 112 are connected between the two first plates 111. The two first plates 111 and the two second plates 112 form a receiving cavity 101 for accommodating the electrode assembly 13. The second plates 112 have at least one groove 1122 formed by the second plates 112 recessed into one side of the receiving cavity 101.

[0032] The area of ​​the second plate 112 is smaller than that of the first plate 111. The second plate 112 has an inner surface and an outer surface that are opposite to each other. The second plate 112 has a protrusion 1121 that protrudes along the inner surface of the second plate 112, and the outer surface of the second plate 112 is recessed at the position corresponding to the protrusion 1121 to form a groove 1122, so as to enhance the structural strength and rigidity of the second plate 112. This can effectively improve the deformation resistance of the battery cell housing 11 during use and enhance its overall stability.

[0033] The area of ​​the second plate 112 is the area of ​​the outer surface of the second plate 112. The aforementioned inner and outer surfaces exist relative to the receiving cavity 101 inside the cell housing 11.

[0034] The first plate 111 is the large surface of the cell housing 11, and the second plate 112 is the small surface of the cell housing 11. The second plate 112 has at least one groove 1122 formed by the second plate 112 recessed into one side of the receiving cavity 101, which can strengthen the structural strength of the small surface of the cell housing 11. Therefore, during the assembly of the liquid cooling plate and the cell housing 11, the liquid cooling plate can be directly placed in the groove 1122 of the second plate 112 to improve installation efficiency and enhance the cooling effect of the liquid cooling plate. Furthermore, the protrusion 1121 of the second plate 112 can fix or support the electrode assembly 13 disposed inside the cell housing 11 to prevent the electrode assembly 13 from shaking and being damaged inside the cell housing 11.

[0035] In one embodiment, such as Figure 2 As shown, the groove 1122 penetrates through the two first plates 111, which can increase the surface area of ​​the cell housing 11, thereby improving heat dissipation efficiency and helping to maintain the temperature stability of the cell 100 during operation.

[0036] In one embodiment, such as Figure 1 As shown, the second plate 112 includes a first part 1211, a second part 1212 and a third part 1213. The first part 1211 and the second part 1212 are spaced apart in the height direction of the cell housing 11. The third part 1213 is connected between the first part 1211 and the second part 1212 to form a groove 1122 on the outer surface of the second plate 112 and a protrusion 1121 corresponding to the groove 1122 on the inner surface, thereby enhancing the structural strength and rigidity of the housing and helping to improve the stability and durability of the cell 100 under mechanical stress.

[0037] Furthermore, such as Figure 1 As shown, an included angle α is provided between the second part 1212 and the third part 1213. The included angle α is greater than or equal to 90°, which helps to maintain the shape of the battery cell housing 11 under the action of external force and reduce the risk of deformation and damage.

[0038] In one embodiment, the height of the protrusion 1121 is less than or equal to 2 mm, and the height of the groove 1122 is less than or equal to 2 mm. This avoids occupying too much space in the cell housing 11, thereby increasing the capacity of the cell 100. It is understood that the height of the protrusion 1121 (in mm) can be one of 0.5, 1, 1.5, or 2, or any value between two such values. Similarly, the height of the groove 1122 (in mm) can be one of 0.5, 1, 1.5, or 2, or any value between two such values.

[0039] In one embodiment, such as Figure 3As shown, there are two or more protrusions 1121, which are spaced apart, and there are two or more grooves 1122, which are spaced apart. Therefore, the spaced arrangement of multiple protrusions 1121 and grooves 1122 can effectively disperse externally applied forces, improve the overall strength and stability of the cell housing 11, and help resist mechanical stress and impact, reducing the risk of deformation and damage.

[0040] The length of the aforementioned cell casing 11 ranges from 300 to 700 mm, the height ranges from 100 to 200 mm, and the thickness is greater than 10 mm. The length range of 300 to 700 mm and the height range of 100 to 200 mm allow for a larger cell casing 11, which can accommodate more electrode material, thereby increasing the battery's capacity and energy density.

[0041] The aforementioned cell casing 11 is the outer shell of a square battery, blade battery, etc.

[0042] This application also provides a battery cell 100, which can be a prismatic battery, a blade battery, etc. Figures 2 to 3 As shown, the battery cell 100 includes a cell housing 11, an end cap 12, and an electrode assembly 13. The cell housing 11 has an opening 102 communicating with a receiving cavity 101. The end cap 12 is connected to the cell housing 11 and closes the opening 102, ensuring the airtightness of the battery cell 100 to effectively prevent electrolyte leakage and the entry of external contaminants, thereby improving the safety and reliability of the battery cell 100. The electrode assembly 13 is disposed within the receiving cavity 101 and protected by the cell housing 11 and the end cap 12, which can prevent the electrode assembly 13 from being damaged by external impacts or vibrations.

[0043] like Figure 3 As shown, the electrode assembly 13 includes an electrode core 131 and an electrode tab 132. The electrode tab 132 is connected between the electrode core 131 and the electrode post 14, ensuring that the current can be effectively transmitted from the cell 100 to the external circuit, or from the external circuit to the cell 100.

[0044] In one embodiment, such as Figures 2 to 3As shown, the cell housing 11 can have two end caps 12, which are located on different sides. The two end caps 12 are positioned opposite each other in the length or height direction of the cell housing 11; that is, the cell housing 11 has two opposite openings 102 in its length or height direction. This configuration facilitates the processing of the cell housing 11, resulting in higher strength and facilitating the assembly of the electrode assembly 13. If the two end caps 12 are adjacent to each other on the cell housing 11, and the two openings 102 for the end caps 12 are also adjacent, while this can still meet the design requirements of the cell 100, this structure increases the processing difficulty of the cell housing 11 and is detrimental to the assembly of the electrode assembly 13.

[0045] In one embodiment, such as Figure 3 As shown, a gap of less than or equal to 1 mm is provided between the protrusion 1121 and the electrode assembly 13. This gap prevents the protrusion 1121 of the cell housing 11 from directly contacting the electrode assembly 13, reducing physical damage caused by friction or collision, and helping to extend the service life of the cell 100. Furthermore, the existence of this gap allows the electrode assembly 13 some room to move during thermal expansion, avoiding stress accumulation and damage caused by restricted expansion.

[0046] like Figure 3 As shown, the battery cell 100 also includes a terminal post 14, which is disposed on the end cap 12. Figure 2 and Figure 3 The diagram illustrates two terminals 14 located on the same end cap 12, which are a positive terminal 14 and a negative terminal 14, respectively. In other embodiments, the two terminals 14 may be located on different end caps 12, that is, one end cap 12 has a positive terminal 14 and the other end cap 12 has a negative terminal 14.

[0047] like Figure 3 As shown, the battery cell 100 also includes an insulating film 15, which covers the outer surface of the electrode assembly 13. That is, the insulating film 15 is disposed within the gap between the protrusion 1121 and the electrode assembly 13, such that the insulating film 15 abuts against the electrode assembly 13 at the protrusion 1121 position, preventing electrical contact between the electrode assembly 13 and the battery cell housing 11. The insulating film 15 is spaced apart from the electrode assembly 13 at positions without the protrusion 1121 to promote gas flow within the battery cell 100 and aid in heat dissipation.

[0048] This application embodiment also provides a battery cell assembly, including the aforementioned battery cell 100 and a liquid cooling plate. The liquid cooling plate is disposed on the battery cell 100, and the width of the groove 1122 of the battery cell housing 11 is the same as the width of the liquid cooling plate (not shown). Specifically, multiple battery cells 100 are arranged in a matrix along the same direction, and the grooves 1122 of the multiple battery cell housings 11 are interconnected to form an elongated through groove. The liquid cooling plate has a tubular structure and is embedded in the elongated through groove to improve the heat dissipation performance of the battery cell 100, which helps to maintain the temperature stability of the battery cell 100 during operation.

[0049] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0050] The above provides a detailed description of a battery cell and battery pack provided in the embodiments of this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. An electric cell housing, characterized by, The battery cell housing comprises two first plate bodies and two second plate bodies, the two second plate bodies and the two first plate bodies form a receiving cavity for receiving an electrode assembly; the second plate body has an area smaller than that of the first plate body; the outer surface of the second plate body has at least one groove formed by recessing one side of the second plate body towards the receiving cavity.

2. The battery cell housing according to claim 1, wherein the groove extends through the two first plate bodies.

3. The battery cell housing according to claim 1, wherein the second plate body comprises a first portion, a second portion and a third portion, the first portion and the second portion are arranged in a spaced manner, and the third portion is connected between the first portion and the second portion to form a groove on the outer surface of the second plate body.

4. The battery cell housing according to claim 3, wherein an included angle is arranged between the second portion and the third portion, and the included angle is greater than or equal to 90°.

5. The battery cell housing according to claim 1, wherein the height of the groove is less than or equal to 2 mm.

6. The battery cell housing according to claim 1, wherein the number of the grooves is more than two, and the more than two grooves are arranged in a spaced manner.

7. The battery cell housing according to claim 1, wherein the length of the battery cell housing ranges from 300 mm to 700 mm, the height ranges from 100 mm to 200 mm, and the thickness is greater than 10 mm.

8. An electric cell characterized by comprising: the battery cell housing according to any one of claims 1 to 7, the battery cell housing has an opening communicating with the receiving cavity; an end cover, the end cover is connected with the battery cell housing and closes the opening; and an electrode assembly, the electrode assembly is arranged in the receiving cavity.

9. The cell of claim 8, wherein, further comprising: a pole, the pole is arranged on the end cover; and an insulating film, the insulating film is wrapped on the outer surface of the electrode assembly. comprising:

10. An electric cell pack, characterized by, the battery cell according to claim 8 or 9; and a liquid cooling plate, the liquid cooling plate is arranged on the battery cell, and the width of the groove of the battery cell housing is the same as the width of the liquid cooling plate. ​ ​

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