Battery cell assembly and battery pack

Abstract

A battery cell assembly and a battery pack. The battery pack comprises the battery cell assembly. The battery cell assembly comprises a battery cell group (10). The battery cell group (10) comprises at least two battery cells. The at least two battery cells are sequentially arranged in a first direction. A first limiting portion is provided on one of two adjacent battery cells, and a second limiting portion mating with the first limiting portion is provided on the other of the two adjacent battery cells. In the battery cell group (10), at least battery cells located at two ends are provided with fixing portions (20), and the fixing portions (20) are at least used for fixing the battery cell group (10) onto a predetermined structure. The battery cell assembly and the battery pack solve the problem of low capacitance of the battery pack having a fixed volume.

Description

Battery cell components and battery packs

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on October 30, 2023, with application number 202322929929.X and application name “Battery Cell Assembly and Battery Pack”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery production technology, and in particular to a battery cell assembly and a battery pack. Background Art

[0003] With the rapid upgrading and rapid development of 3C products, the lithium-ion battery pack industry has become increasingly competitive. Major battery pack manufacturers are scrambling to innovate lithium-ion battery structure and process technology to improve product safety and production efficiency in order to enhance their competitiveness in the industry.

[0004] The production process of laptop battery packs requires the following steps: pad printing and coding, gluing, tab cutting, rubber frame installation, protective plate welding, glue lamination and packaging, performance testing, and size measurement.

[0005] However, traditional laptop battery packs have a plastic frame and screw holes that need to be injection-molded around the plastic frame. At the same time, there is usually a gap between the battery cells and the plastic frame, which increases the volume of the battery pack and makes the battery capacity of the battery pack too low at a fixed volume.

[0006] Summary of the Invention

[0007] The main purpose of the present application is to provide a battery cell assembly and a battery pack to at least solve the problem of low capacity of a battery pack with a fixed volume in the prior art.

[0008] According to one aspect of the present application, a battery cell assembly is provided, comprising:

[0009] A battery cell group, the battery cell group includes at least two battery cells, and the at least two battery cells are arranged in sequence along a first direction, wherein:

[0010] Among two adjacent battery cells, one battery cell is provided with a first limiting portion, and the other battery cell is provided with a second limiting portion adapted to the first limiting portion;

[0011] In the battery cell group, at least the battery cells at both ends are provided with fixing parts, and the fixing parts are at least used to fix the battery cell group on a predetermined structure.

[0012] Furthermore, the first limiting portion includes a first concave-convex structure, and the second limiting portion includes a second concave-convex structure adapted to the first concave-convex structure.

[0013] Furthermore, the first concave-convex structure includes a first convex portion and a first concave portion, the first convex portion convexes along a first direction, and the first concave portion concave along a direction opposite to the first direction;

[0014] The second concave-convex structure includes a second concave portion adapted to the first convex portion and a second convex portion adapted to the first concave portion, the second convex portion convexes in a direction opposite to the first direction, and the second concave portion concave in the first direction.

[0015] Furthermore, the first recessed portion and the first raised portion are arranged side by side along the thickness direction of the battery cell assembly, and the second raised portion and the second recessed portion are arranged side by side along the thickness direction of the battery cell assembly.

[0016] Furthermore, edges of the first protrusion and / or the second protrusion are chamfered.

[0017] Furthermore, the battery cell group includes a first surface and a second surface, a side of the first protrusion away from the second protrusion is flush with the second surface, and a side of the second protrusion away from the first protrusion is flush with the first surface.

[0018] Furthermore, the first concave-convex structure and the second concave-convex structure are both arranged on the battery core along the second direction.

[0019] Furthermore, the first concave-convex structure includes a plurality of first concave-convex structures, which are spaced apart along the second direction; the second concave-convex structure includes a plurality of second concave-convex structures, which are spaced apart along the second direction, and the first concave-convex structures correspond to the second concave-convex structures one by one.

[0020] Furthermore, the battery cell includes a main body and a flange portion, the flange portion is arranged on the outer periphery of the main body, and the fixing portion includes at least one screw hole, which is arranged on the flange portion through the thickness direction; and / or,

[0021] The screw holes are arranged through the main body along the thickness direction.

[0022] On the other hand, the present application also proposes a battery pack, which includes the above-mentioned battery cell assembly.

[0023] Compared to the prior art, the fixing portion in this application is directly provided on the battery cell, eliminating the need for additional injection molding of the fixing portion on the battery cell, thereby reducing the overall volume of the battery pack formed by the battery cell group to a certain extent. Furthermore, in the two adjacent battery cells of this application, a first limiting portion and a second limiting portion are respectively provided that match each other. The first limiting portion and the second limiting portion allow the battery cells to be directly spliced ​​together, eliminating the need for a plastic frame to fix multiple battery cells, thereby further reducing the overall volume of the battery pack formed by the battery cell group. This means that compared to traditional battery packs, at the same volume, the battery pack of this application has a much higher capacity than traditional battery packs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0025] FIG1 is a schematic structural diagram of a battery cell assembly disclosed in the present application at a first viewing angle;

[0026] FIG2 is a schematic structural diagram of the battery cell assembly disclosed in this application from a second viewing angle;

[0027] FIG3 is a schematic structural diagram of the battery cell assembly disclosed in the present application from a third viewing angle;

[0028] FIG4 is a schematic structural diagram of the second battery cell disclosed in this application.

[0029] Among them, the above-mentioned drawings include the following figure marks: 10, battery cell group; 11, first battery cell; 12, second battery cell; 13, third battery cell; 14, first surface; 15, second surface; 20, fixing part; 30, first concave-convex structure; 31, first protruding part; 32, first concave part; 40, second concave-convex structure; 41, second protruding part; 42, second concave part; 50, tab connection port. DETAILED DESCRIPTION

[0030] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0031] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0032] Unless otherwise specifically stated, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorized specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary, rather than as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0033] 1 to 3 , according to an embodiment of the present application, a battery pack is provided, which includes a battery cell assembly.

[0034] Among them, the battery cell assembly includes a battery cell group 10. The battery cell group 10 includes at least two battery cells, and at least two battery cells are arranged in sequence along the first direction. Among them, in two adjacent battery cells, a first limiting portion is provided on one battery cell, and a second limiting portion compatible with the first limiting portion is provided on the other battery cell. And in the battery cell group 10, at least the battery cells located at both ends are provided with a fixing portion 20, and the fixing portion 20 is at least used to fix the battery cell group 10 on a predetermined structure. In this embodiment, the battery cell uses a hard shell battery cell, such as a steel shell battery cell, because the steel shell battery cell has the characteristics of high strength and high hardness. Therefore, there is no need to set a rubber frame to fix the steel shell battery cell.

[0035] Compared to the prior art, the fixing portion 20 in this embodiment is directly provided on the battery cell, eliminating the need for additional injection molding of the fixing portion 20 on the battery cell. This, to a certain extent, reduces the overall volume of the battery pack formed using the battery cell group 10. Furthermore, in this embodiment, two adjacent battery cells are provided with matching first and second limiting portions, which allow the battery cells to be directly spliced ​​together, eliminating the need for a plastic frame to secure multiple battery cells, thereby further reducing the overall volume of the battery pack formed by the battery cell group 10. This means that compared to traditional battery packs, at the same volume, the battery pack of this embodiment has a much higher capacity than traditional battery packs.

[0036] It is worth mentioning that when the battery cell assembly includes two or more battery cells, it is only necessary to provide a fixing portion 20 on the battery cells at both ends to complete the fixation of the battery cell assembly. For example, as shown in FIG2, when there are three battery cells in the battery cell assembly, along the first direction, the three battery cells are the first battery cell 11, the second battery cell 12 and the third battery cell 13. A fixing portion 20 is provided on both the first battery cell 11 and the third battery cell 13, and a first limiting portion is provided on the first battery cell 11, and a second limiting portion is provided on the third battery cell 13. As shown in FIG4, a second limiting portion that is compatible with the first limiting portion of the first battery cell 11 is provided on the side of the second battery cell 12 close to the first battery cell 11, and a first limiting portion that is compatible with the second limiting portion of the third battery cell 13 is provided on the side of the second battery cell 12 close to the third battery cell 13. The second battery cell 12 is spliced ​​between the first battery cell 11 and the third battery cell 13 via the first and second limiting portions. When the first and third battery cells 11, 13 are fixed to the predetermined structure via the fixing portion 20, the second battery cell 12 is also fixed by the first and second limiting portions. Of course, the fixing portion 20 can also be provided on the second battery cell 12 to further enhance the fixing effect of the battery cells.

[0037] As shown in Figure 1 , the first retaining portion includes a first concave-convex structure 30, and the second retaining portion includes a second concave-convex structure 40 that matches the first concave-convex structure 30. In this embodiment, the connection between two adjacent battery cells relies on the first concave-convex structure 30 and the second concave-convex structure 40. Therefore, there is no need to provide an additional rubber frame in the battery cell assembly to secure the two adjacent battery cells, thereby reducing the overall volume of the battery pack to a certain extent and facilitating quick and easy assembly.

[0038] Furthermore, the first concave-convex structure 30 includes a first protrusion 31 and a first concave portion 32, wherein the first protrusion 31 protrudes in a first direction and the first concave portion 32 is concave in a direction opposite to the first direction. The second concave-convex structure 40 includes a second concave portion 42 adapted to the first protrusion 31 and a second protrusion 41 adapted to the first concave portion 32, wherein the second protrusion 41 protrudes in a direction opposite to the first direction and the second concave portion 42 is concave in the first direction. Specifically, the first protrusion 31 is adapted to the second concave portion 42, the first concave portion 32 is adapted to the second protrusion 41, the first protrusion 31 is inserted into the second concave portion 42, and the second protrusion 41 is inserted into the first concave portion 32, thereby completing the splicing between the two adjacent battery cells, and there is no gap between the two adjacent hard shells, and they are in close contact with each other.

[0039] In addition, the first recessed portion 32 and the first raised portion 31 are arranged side by side along the thickness direction of the battery cell assembly, and the second raised portion 41 and the second recessed portion 42 are arranged side by side along the thickness direction of the battery cell assembly.

[0040] When the first protrusion 31 is inserted into the second recess 42 and the second protrusion 41 is inserted into the first recess 32, a supporting force can be applied to the battery cell in the thickness direction or in the direction opposite to the thickness direction, thereby better fixing the battery cell. As shown in FIG2 , along the thickness direction, the second protrusion 41 of the second battery cell 12 is located above the first protrusion 31 of the first battery cell 11, and the first protrusion 31 of the second battery cell 12 is located below the second protrusion 41 of the third battery cell 13. If a force is applied to the second battery cell 12 in the thickness direction, the second protrusion 41 of the fixed third battery cell 13 will apply a force opposite to the thickness direction to the second battery cell 12, thereby preventing the second battery cell 12 from relative displacement with the first battery cell 11 and the third battery cell 13. Similarly, if a force is applied to the second battery cell 12 in a direction opposite to the thickness direction, the first protrusion 31 of the first battery cell 11 will apply a reaction force along the thickness direction to the second battery cell 12, so that the second battery cell 12 will not be displaced relative to the first battery cell 11 and the third battery cell 13.

[0041] Furthermore, the edges of the first protrusion 31 and / or the second protrusion 41 are provided with chamfers. It should be noted that "the edges of the first protrusion 31 and / or the second protrusion 41 are provided with chamfers" means that the edge of the first protrusion 31 is provided with a chamfer, the edge of the second protrusion 41 is provided with a chamfer, and the edges of the first protrusion 31 and the second protrusion 41 are provided with chamfers. In this embodiment, the edges of the first protrusion 31 and the second protrusion 41 are both provided with chamfers. On the one hand, the setting of the chamfer can reduce the stress concentration on the first protrusion 31 and the second protrusion 41 to a certain extent, thereby reducing the probability of damage to the first protrusion 31 and the second protrusion 41. On the other hand, the setting of the chamfer facilitates the splicing of two adjacent battery cells.

[0042] Furthermore, the battery cell group 10 includes a first surface 14 and a second surface 15 . The side of the first protrusion 31 away from the second protrusion 41 is flush with the second surface 15 , and the side of the second protrusion 41 away from the first protrusion 31 is flush with the first surface 14 .

[0043] As shown in FIG1 , the second surface 15 and the first surface 14 are two surfaces in the thickness direction of the battery cell assembly 10. When the side of the first protrusion 31 away from the second protrusion 41 is flush with the second surface 15, and the side of the second protrusion 41 away from the first protrusion 31 is flush with the first surface 14, there will be no thickness difference between two adjacent battery cells fixed to the predetermined structure, thereby preventing either of the two adjacent battery cells from falling off the predetermined structure when affected by external forces.

[0044] Furthermore, the first concave-convex structure 30 and the second concave-convex structure 40 are both arranged along the second direction through the battery cell. Specifically, the first raised portion 31 and the second raised portion 41 both extend along the second direction and are arranged in a stepped manner on the battery cell. At the same time, the first recessed portion 32 and the second recessed portion 42 both extend along the second direction and match the first raised portion 31 and the second raised portion 41, respectively. The structure of this embodiment can increase the contact area between two adjacent battery cells, thereby improving the reliability of the splicing between the two adjacent battery cells to a certain extent.

[0045] Optionally, the first concave-convex structure 30 includes a plurality of first concave-convex structures 30, which are spaced apart along the second direction; the second concave-convex structure 40 includes a plurality of second concave-convex structures 40, which are spaced apart along the second direction, and the first concave-convex structures 30 and the second concave-convex structures 40 correspond one to one. In this embodiment, the first raised portion 31 and the second raised portion 41 are both raised blocks, and the first recessed portion 32 and the second recessed portion 42 are both recessed grooves. Unlike the above structure, the structure of this embodiment can significantly improve the reliability of the splicing between two adjacent battery cells, but the processing technology is difficult and the production cost is high.

[0046] Furthermore, the battery cell includes a main body and a flange portion, the flange portion is arranged on the outer periphery of the main body, and the fixing portion 20 includes at least one screw hole, and the screw hole is arranged on the flange portion along the thickness direction. Specifically, the interior of the main body of the battery cell includes battery cell components such as a positive electrode sheet (not shown in the figure), a negative electrode sheet (not shown in the figure), and a diaphragm (not shown in the figure). There is a certain space between the interior of the flange portion and the interior of the main body, that is, there is a certain gap between the battery cell components and the hard shell. The structure of this embodiment can, on the one hand, prevent the screw holes provided on the flange portion from causing damage to the battery cell components, and on the other hand, can provide a reserved space for the battery cell components after they are charged and expanded, to prevent the battery cell components from being squeezed with the outer shell and damaged after expansion. In a specific embodiment, the battery cell is a rectangular parallelepiped, and the fixing portion 20 includes two screw holes, which are respectively provided at the corners of the flange portion of the rectangular parallelepiped.

[0047] Optionally, the screw hole is provided through the main body along the thickness direction. Further, the screw hole can be provided through the main body of the battery cell along the thickness direction at any position without damaging the battery cell components.

[0048] In addition, the battery cell assembly of this embodiment further includes a tab (not shown) and a tab connector 50. The tab is disposed within the body and connected to the tab connector 50 on the battery cell. The battery pack of this embodiment further includes a circuit protection board (not shown), which is disposed outside the battery cell and connected to the tab connector 50 to prevent the battery cell assembly from overcharging, overdischarging, overcurrent, short circuiting, and ultra-high temperature charging and discharging.

[0049] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0050] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0051] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell assembly, characterized in that: include: A battery cell group (10), the battery cell group (10) comprising at least two battery cells, the at least two battery cells being arranged in sequence along a first direction, wherein: Among two adjacent battery cells, one of the battery cells is provided with a first limiting portion, and the other battery cell is provided with a second limiting portion matched with the first limiting portion; In the battery cell group (10), at least the battery cells at the two ends are provided with fixing parts (20), and the fixing parts (20) are at least used to fix the battery cell group (10) on a predetermined structure.

2. The battery cell assembly according to claim 1, characterized in that: The first limiting portion comprises a first concave-convex structure (30), and the second limiting portion comprises a second concave-convex structure (40) adapted to the first concave-convex structure (30).

3. The battery cell assembly according to claim 2, characterized in that: The first concave-convex structure (30) comprises a first convex portion (31) and a first concave portion (32), wherein the first convex portion (31) convexly projects along the first direction, and the first concave portion (32) is concavely projected along a direction opposite to the first direction; The second concave-convex structure (40) comprises a second concave portion (42) adapted to the first convex portion (31), and a second convex portion (41) adapted to the first concave portion (32), wherein the second convex portion (41) convexes in a direction opposite to the first direction, and the second concave portion (42) is concave in the first direction.

4. The battery cell assembly according to claim 3, characterized in that: The first recessed portion (32) and the first raised portion (31) are arranged side by side along the thickness direction of the battery cell assembly, and the second raised portion (41) and the second recessed portion (42) are arranged side by side along the thickness direction of the battery cell assembly.

5. The battery cell assembly according to claim 3, characterized in that: The edges of the first protruding portion (31) and / or the second protruding portion (41) are provided with chamfers.

6. The battery core assembly according to claim 3, characterized in that: The battery cell group (10) comprises a first surface (14) and a second surface (15); a side of the first protrusion (31) away from the second protrusion (41) is flush with the second surface (15); and a side of the second protrusion (41) away from the first protrusion (31) is flush with the first surface (14).

7. The battery cell assembly according to any one of claims 2 to 6, characterized in that: The first concave-convex structure (30) and the second concave-convex structure (40) are both arranged on the battery core in a second direction.

8. The battery cell assembly according to any one of claims 2 to 6, characterized in that: The first concave-convex structure (30) includes a plurality of first concave-convex structures (30) arranged at intervals along a second direction, the second concave-convex structure (40) includes a plurality of second concave-convex structures (40) arranged at intervals along the second direction, and the first concave-convex structure (30) corresponds to the second concave-convex structure (40) one by one.

9. The battery core assembly according to any one of claims 1 to 6, characterized in that: The battery core comprises a main body and a flange portion, wherein the flange portion is arranged on the outer periphery of the main body, and the fixing portion (20) comprises at least one screw hole, wherein the screw hole is arranged on the flange portion through the thickness direction; and / or, The screw hole is arranged on the main body through the thickness direction.

10. A battery pack, characterized in that: The battery pack comprises the battery cell assembly according to any one of claims 1 to 9.

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