Battery cell assembly, battery module, battery pack and power utilization device
By designing a frame and double-layer fixed structural components, the problem of cell damage during cell expansion suppression is solved, thereby improving the mechanical strength and stability of the cell assembly and ensuring the safety and electrical connection function of the cell.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-06
- Publication Date
- 2026-03-24
AI Technical Summary
In the process of suppressing cell expansion, existing technologies have low efficiency in restricting the metal casing, while winding and binding can easily damage the cell, resulting in reduced or damaged cell assembly efficiency.
The design employs a frame and double-layer fixing structure. The frame is fitted onto the outside of the battery cell, and the double-layer fixing structure is secured by wrapping with wire or tape and applying adhesive, which enhances mechanical strength and buffers expansion to prevent damage to the battery cell.
It effectively suppresses cell expansion, improves the mechanical strength and stability of cell components, avoids cell damage, and maintains the structural integrity and electrical connection function of the cell.
Smart Images
Figure CN224036520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a kind of electric core subassembly, battery module, battery pack and electric device. BACKGROUND
[0002] Battery module usually includes one or more electric cores. In the charging process of battery module, the phenomenon of electric core expansion is generally present. This phenomenon not only affects the structural stability of battery module, but also can cause adverse effects on the performance and life of electric core. In order to inhibit the expansion of electric core in the charging process, the metal shell matching the shape of electric core is currently generally used as the shell of electric core to limit the expansion of electric core, or the material with certain tensile strength is used to wrap and bind electric core to limit the expansion of electric core.
[0003] However, the scheme of limiting electric core expansion by using metal shell will lead to the decrease of electric core grouping efficiency, and the scheme of using other materials for winding and binding is easy to damage electric core.
[0004] Therefore, the problem to be solved by the present disclosure is how to inhibit the expansion of electric core while avoiding the damage of electric core. SUMMARY
[0005] In view of the above problems, the present disclosure provides an electric core assembly, a battery module, a battery pack and an electric device.
[0006] According to the first aspect of the present disclosure, an electric core assembly is provided, comprising: an electric core having two main planes opposite along a first direction and two side planes opposite along a second direction; a frame body sleeved outside the electric core, comprising two first plates opposite along the second direction and two second plates for connecting the two first plates respectively, wherein the height of the first plate along the first direction is lower than the height of the electric core along the first direction, so that the two side edges of the side plane along the first direction exceed the first plate; a first fixing structure around the outside of the first plate and the electric core, for pressing and holding the electric core; and a second fixing structure around the outside of the first fixing structure, for further pressing and holding the electric core via the first fixing structure.
[0007] In the technical scheme of the embodiments of the present disclosure, a frame body as a protection frame of the battery cell is arranged in the circumferential direction of the battery cell. Specifically, the frame body is arranged outside the battery cell around the side plane of the battery cell and the two end faces connected with the main plane and the side plane, and the two side edges of the first plate opposite to the side plane in the first direction do not exceed the two side edges of the side plane. The fixing structure is arranged outside the first plate and the battery cell, and the fixing structure is composed of the first fixing structure in the inner layer and the second fixing structure in the outer layer. The purpose of this design is to enhance the mechanical strength of the battery cell assembly and maintain the compression force of the fixing structure on the battery cell by the double-layer fixing structure. The frame body can protect the battery cell from being damaged by excessive extrusion of the fixing structure.
[0008] In some embodiments, the battery cell assembly further comprises an elastic member arranged between the first fixing structure and the main plane for buffering the expansion of the battery cell. The elastic member can provide space for the reasonable expansion of the battery cell, reduce the pressure on the battery cell during expansion, and protect the structure of the battery cell.
[0009] In some embodiments, the two side edges of the first plate in the first direction have a rounded corner portion for buffering the compression of the battery cell at the corner by the first fixing structure and the second fixing structure. As described above, the fixing structure is most likely to damage the battery cell at the corner, and by arranging the rounded corner portion on the two side edges of the first plate, stress concentration at the corner can be effectively avoided.
[0010] In some embodiments, the height of the at least one second plate in the first direction is lower than the height of the first plate in the first direction, so that the electrical connection part of the battery cell extends out of the frame body. The second plate is generally opposite to the two end faces of the battery cell. An electrical connection part such as a tab is arranged on at least one end face. In order not to affect the electrical connection of the electrical connection part with the outside, at least one second plate opposite to the end face needs to be arranged to have a lower height than the first plate, so that the electrical connection part extends out of the frame body.
[0011] In some embodiments, the first fixing structure comprises a wire or a belt for tensionally winding outside the first plate and the battery cell to compress and hold the battery cell; and the second fixing structure comprises a wire or a belt for tensionally winding outside the first fixing structure to further compress and hold the battery cell via the first fixing structure.
[0012] In some embodiments, the first fixing structure is coated with an adhesive after being wound outside the first plate and the battery cell, so that the first fixing structure maintains the tension force when the adhesive is cured; the second fixing structure is wound outside the first fixing structure after the adhesive of the first fixing structure is cured; and the second fixing structure is coated with an adhesive after being wound outside the first fixing structure, so that the second fixing structure maintains the tension force when the adhesive is cured.
[0013] In some embodiments, the elastic member is provided only between the first fixing structure and one of the two main planes which has a greater expansion amount in the first direction.
[0014] In some embodiments, the elastic member is provided between the first fixing structure and each of the two main planes.
[0015] According to a second aspect of the present disclosure, there is provided a battery module comprising a case and at least one of the above-mentioned embodiments of the battery cell assembly. Such a battery module can provide the advantages as described above in relation to the battery cell assembly, which will not be repeated for the sake of brevity.
[0016] According to a third aspect of the present disclosure, there is provided a battery pack comprising the above-mentioned embodiments of the battery module. Such a battery pack can provide the advantages as described above in relation to the battery cell assembly, which will not be repeated for the sake of brevity.
[0017] According to a fourth aspect of the present disclosure, there is provided an electric device comprising the above-mentioned embodiments of the battery pack for providing electric energy. Such an electric device can provide the advantages as described above in relation to the battery cell assembly, which will not be repeated for the sake of brevity.
[0018] It should be understood that the above description is only a summary of the technical solutions of the present disclosure, in order to enable the technical means of the present disclosure to be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the following specific embodiments of the present disclosure are described in detail. BRIEF DESCRIPTION OF DRAWINGS
[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art, upon reading the following detailed description of the preferred embodiments. The accompanying drawings are intended to depict only preferred embodiments of the disclosure and therefore should not be considered to narrow its scope. It should be noted that the drawings are not necessarily drawn to scale and that, unless otherwise indicated, certain features of the drawings can be exaggerated in scale, for purposes of clarity. In all the figures of the drawing, like reference numerals refer to like parts throughout the several views. In the figures:
[0020] Figure 1 a structural schematic diagram of a battery cell assembly of some embodiments of the present disclosure is shown;
[0021] Figure 2 a structural schematic diagram of a battery cell assembly of some embodiments of the present disclosure is shown;
[0022] Figure 3 a structural schematic diagram of a battery cell assembly of some embodiments of the present disclosure is shown;
[0023] Figure 4A structural schematic diagram of an electric cell assembly of some other embodiments of the present disclosure is shown.
[0024] Figure 5 A structural schematic diagram of an electric cell assembly of some other embodiments of the present disclosure is shown.
[0025] Figure 6 A structural schematic diagram of an electric cell assembly of some other embodiments of the present disclosure is shown.
[0026] 1 electric cell assembly
[0027] 10 electric cell
[0028] 11a, 11b main plane
[0029] 12a, 12b side plane
[0030] 20 frame body
[0031] 21 first plate
[0032] 211 round corner part
[0033] 22 second plate
[0034] 30 first fixing structure
[0035] 40 second fixing structure
[0036] 50 elastic member DETAILED DESCRIPTION
[0037] The embodiments of the technical solutions of the present disclosure will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present disclosure, and therefore only serve as examples, and cannot limit the protection scope of the present disclosure.
[0038] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present disclosure belongs; the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the present disclosure; the terms “include” and “have” and any variations thereof in the specification and claims of the present disclosure and the above description of drawings are intended to cover non-exclusive inclusion.
[0039] In the description of the embodiments of the present disclosure, the technical terms “first”, “second”, etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present disclosure, the meaning of “a plurality of” is two or more, unless otherwise explicitly and specifically limited.
[0040] Reference to“an embodiment” herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the disclosure. The appearances of the phrase“in an embodiment” in various places in the specification are not necessarily referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.
[0041] In the description of the embodiments of the disclosure, the term“and / or” only means an association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A existing alone, A and B existing together, and B existing alone. In addition, the character“ / ” herein generally represents that the front and rear associated objects have an“or” relationship.
[0042] In the description of the embodiments of the disclosure, the term“a plurality of” refers to two or more (including two), and similarly, “a plurality of groups” refers to two or more groups (including two groups), and “a plurality of pieces” refers to two or more pieces (including two pieces).
[0043] In the description of the embodiments of the disclosure, the technical terms“center”,“longitudinal”,“transverse”,“length”,“width”,“thickness”,“upper”,“lower”,“front”,“rear”,“left”,“right”,“vertical”,“horizontal”,“top”,“bottom”,“inner”,“outer”,“clockwise”,“counterclockwise”,“axial”,“radial”,“circumferential” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the disclosure and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the disclosure.
[0044] In the description of the embodiments of the disclosure, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connection”,“connection”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the disclosure can be understood according to the specific circumstances.
[0045] Existing battery cell structures typically include a housing space that matches the cell's shape, such as a socket, slot, or a shell formed by multiple side / end plates, to secure the cell and provide support and protection. This method of limiting cell expansion by compressing the cell poses a risk, potentially leading to cell breakage or even explosion. In other cell structures, materials with a certain tensile strength are used to wrap and bind the cell to limit its expansion; however, the high-strength wires or strips used for wrapping can easily damage the cell, especially at corners, potentially damaging the internal electrodes.
[0046] This disclosure relates to a cell assembly that can suppress cell expansion while avoiding damage to the cell. The cell assembly disclosed in this disclosure can be used in batteries.
[0047] Reference Figure 1 , Figure 1 A schematic diagram of the structure of a battery cell assembly 1 according to some embodiments of this application is shown. The battery cell assembly 1 includes: a battery cell 10, a frame 20, a first fixing structure 30, and a second fixing structure 40. The battery cell 10 has two main planes 11a and 11b opposite each other along a first direction and two side planes 12a and 12b opposite each other along a second direction. The frame 20 is sleeved on the outside of the battery cell 10 and includes two first plates 21 opposite each other along the second direction and two second plates 22 for respectively connecting the two first plates 21. The height of the first plates 21 along the first direction is lower than the height of the battery cell 10 along the first direction, so that the side edges of the side planes 12a and 12b along the first direction extend beyond the first plates 21. The first fixing structure 30 is disposed around the first plates 21 and the outside of the battery cell 10 for pressing and holding the battery cell 10. The second fixing structure 40 is disposed around the outside of the first fixing structure 30 for further pressing and holding the battery cell 10 via the first fixing structure 30.
[0048] In embodiments of this disclosure, the battery cell is approximately cubic in shape, having two opposing main planes, two side planes, and two end faces. Specifically, the main planes and side planes are two surfaces of the battery cell with relatively large surface areas, and the end faces are the surfaces of the battery cell used for external electrical connections, wherein one of the two end faces has an electrical connection portion.
[0049] exist Figure 1In the illustrated embodiment, the main planes 11a, 11b are the upper and lower surfaces of the battery cell 10, the first direction is the height direction of the battery cell 10, and the second direction is the length direction of the battery cell 10. During the charging process of the battery cell 10, the main planes 11a, 11b have a large expansion amplitude. The frame body 20 is arranged outside the battery cell 10 around the two side planes 12a, 12b and the two end planes of the battery cell, thereby forming a circumferential protection frame. The frame body 20 further includes a first plate 21 opposite to the side planes 12a, 12b and a second plate 22 opposite to the end planes. The height of the first plate 21 is not greater than the height of the side planes 12a, 12b, so that the overall height of the battery cell assembly 1 is not increased due to the addition of the frame body 20. A first fixing structure 30 is arranged outside the first plate 21 and the outer side of the battery cell 10, and a second fixing structure 40 is further arranged outside the first fixing structure. The double-layer fixing structure enhances the mechanical strength of the battery cell assembly 1 and maintains the pressing force of the first fixing structure 30 and the second fixing structure 40 on the battery cell 10. Since the frame body 20 is further arranged between the battery cell 10 and the first fixing structure 30, the battery cell 10 is not directly subjected to the extrusion of the first fixing structure 30 and is not damaged.
[0050] It should be noted that the first plate 21 and the second plate 22 of the frame body 20 can be an integrally formed frame body 20, or can be independent plate bodies and connected into a frame body 20 by mechanical connection or adhesive bonding. The frame body 20 is attached to the surface of the battery cell 10 by double-sided adhesive or is engaged with the battery cell 10. The frame body 20 can be centrally arranged outside the battery cell 10 in the height direction, so that when the first fixing structure 30 and the second fixing structure 40 on the outer side press the battery cell 10, the frame body 20 and the battery cell 10 are relatively symmetrically stressed. According to actual application scenarios, the arrangement position of the frame body 20 can also be adjusted so that it is biased toward one of the main planes 11a, 11b. In addition, the frame body 20 is made of a material having a certain rigidity, and the rigidity can provide the rigidity required for the first fixing structure 30 and the second fixing structure 40 to press the battery cell 10, thereby protecting the structure of the battery cell 10.
[0051] The "normal expansion" mentioned above refers to the normal expansion phenomenon of the battery cell during use, which does not cause damage or other adverse phenomena to the battery cell. It should be understood that when the battery cell is restricted by an external structure during expansion, the internal pressure of the battery cell may be too large in some local parts, causing internal damage to the battery cell, surface damage or even explosion of the battery cell. The embodiments of the present disclosure provide a dumbbell-shaped shell and an expansion space, which have the following advantages compared with the battery cell assembly in the prior art: reasonably limiting the expansion of the battery cell and reducing the pressure on the battery cell.
[0052] In some embodiments of the present disclosure, the height of the at least one second plate 22 along the first direction is lower than the height of the first plate 21 along the first direction, so that the electrical connection part of the battery cell 10 extends out of the frame 20. In a battery cell module, each battery cell is electrically connected to the outside through the electrical connection part. Therefore, the at least one second plate 22 opposite to the end face needs to be set to a lower height than the first plate 21, so that the electrical connection part extends out of the frame 20. In some embodiments, the height of the second plate can also be kept consistent with the height of the first plate 21, so that the structure of the frame 20 is more stable, and at the same time, a through hole matching the number and size of the electrical connection part is formed on the second plate 22 corresponding to the end face with the electrical connection part, so that the electrical connection part extends out of the frame 20.
[0053] In some embodiments of the present disclosure, the first fixing structure 30 includes a wire or a belt for being tightly wound on the outside of the first plate 21 and the battery cell 10 to press and hold the battery cell 10; and the second fixing structure 40 includes a wire or a belt for being tightly wound on the outside of the first fixing structure 30 to further press and hold the battery cell 10 through the first fixing structure 30.
[0054] It should be understood that the tight winding refers to providing a predetermined tension for the fixing structure 30 and the second fixing structure 40 in the form of a wire or a belt, and the fixing structure 30 and the second fixing structure 40 remain tight within a predetermined time after being wound. In some embodiments, the predetermined time can be, for example, the service life specified by the manufacturer of the battery cell. By tightly winding the fixing structure 30 and the second fixing structure 40, on the one hand, the volume can be reduced, so that the structure of the battery cell assembly 1 remains compact, and the energy density of the battery cell assembly 1 is improved; on the other hand, the fixing structure 30 and the second fixing structure 40 can maintain a certain shear strength and hardness, thereby facilitating the protection of the internal structure of the battery cell assembly 1. For example, the fixing structure 30 and the second fixing structure 40 in the form of a wire or a belt can be composed of carbon fiber wire or glass fiber. The carbon fiber or glass fiber material has the characteristics of high tensile strength, light weight, high temperature resistance and wear resistance, so that a greater tension can be applied during winding, and the structural strength and stability of the battery cell assembly 1 can be significantly improved without significantly increasing the overall weight.
[0055] In some embodiments of the present disclosure, the first fixing structure 30 is coated with an adhesive after being wound on the outside of the first plate 21 and the battery cell 10, so that the first fixing structure 30 maintains the tension in the case of curing of the adhesive; the second fixing structure 40 is wound on the outside of the first fixing structure 30 after the curing of the adhesive of the first fixing structure 30; and the second fixing structure 40 is coated with an adhesive after being wound on the outside of the first fixing structure 30, so that the second fixing structure 40 maintains the tension in the case of curing of the adhesive.
[0056] It should be understood that the adhesive used to coat the first and second fixing structures 30 and 40 is a curable adhesive. The adhesive used is a fluid with a certain flowability before curing, and forms a rigid structure after curing. The adhesive infiltrates the first and second fixing structures 30 and 40 after coating, and coats all parts of the first and second fixing structures 30 and 40. Through this coating method, the adhesive is tightly combined with the first and second fixing structures 30 and 40 after curing, forming an inseparable whole structure similar to a "hardened shell". In this way, the whole structure formed has shear resistance and deformation resistance, is beneficial to protecting the internal structure of the battery cell assembly 1 from the external environment, and can limit the excessive expansion of the battery cell 10. As for the specific process of the first and second fixing structures 30 and 40, it is necessary to ensure that the adhesive of the first fixing structure 30 is fully cured before continuing to wind the second fixing structure 40 of the outer layer. In this way, it can prevent the first fixing structure 30 from deforming or shifting due to external forces (such as fiber tension, winding pressure, etc.), resulting in irregular shape of the finally formed first fixing structure 30, affecting the dimensional accuracy and structural integrity. In addition, after the first fixing structure 30 is cured, the surface quality, dimensional accuracy and defect situation can be checked and repaired. If there is a problem, it can be handled in time before winding the second fixing structure 40, so as to avoid the defect being covered by the second fixing structure 40 of the outer layer, thereby improving the quality of the final fixing structure.
[0057] The following refers to Figure 4 , Figure 4 The structural schematic diagram of the battery cell assembly 1 of some other embodiments of the present application is shown. In Figure 4 In the embodiment shown, the first plate 21 has a rounded corner portion 211 on both side edges in the first direction, which is used to buffer the pressure of the first and second fixing structures 30 and 40 on the battery cell 10 at the corners. For the first and second fixing structures 30 and 40 formed by winding under tension of a wire or a tape as described above, stress concentration will occur at the four corners around the battery cell. Therefore, the corners are the most vulnerable parts of the battery cell.
[0058] Compared with Figure 1 the embodiment shown, Figure 4 In the embodiment shown, the first plate 21 has a rounded corner portion 211 on both side edges in the first direction, which is used to buffer the pressure of the first and second fixing structures 30 and 40 on the battery cell 10 at the corners. For the first and second fixing structures 30 and 40 formed by winding under tension of a wire or a tape as described above, stress concentration will occur at the four corners around the battery cell. Therefore, the corners are the most vulnerable parts of the battery cell.
[0059] The following refers to Figures 2-3 and Figures 5-6 , Figure 2 , Figure 3 , Figure 5 , Figure 6Schematic diagrams of the structure of a battery cell assembly with a single-sided elastic element according to some embodiments of the present disclosure, schematic diagrams of the structure of a battery cell assembly with elastic elements on both sides according to some embodiments of the present disclosure, schematic diagrams of the structure of a battery cell assembly with a single-sided elastic element according to other embodiments of the present disclosure, and schematic diagrams of the structure of a battery cell assembly with elastic elements on both sides according to other embodiments of the present disclosure are shown respectively. Figure 2 , Figure 3 , Figure 5 , Figure 6 As shown, the battery cell assembly 1 further includes an elastic element 50, disposed between the first fixed structure 30 and the main planes 11a and 11b, for buffering the expansion of the battery cell 10. As described above, the elastic element 50 is a material with a certain deformation capacity; in other words, the elastic element 50 is a compressible and resilient material. During charging, when the battery cell 10 expands, the elastic element 50 can be compressed by the battery cell 10 to offset the volume change caused by the expansion; after charging, when the volume of the battery cell 10 recovers, the elastic element 50 can rebound in accordance with the volume reduction of the battery cell 10. In this design, the elastic element 50 is always filled between the first fixed structure 30 and the main planes 11a and 11b, and can also provide support for the first fixed structure 30. Furthermore, the elastic element 50 can be made of a thermally conductive material to optimize the heat dissipation of the battery cell 10.
[0060] In some embodiments of this disclosure, such as Figure 2 and Figure 5 As shown, the elastic element 50 is only disposed between the first fixing structure 30 and the main plane 11a or 11b, which has a larger expansion amount along the first direction. In practical applications, the expansion of the battery cell along the two main planes 11a and 11b is usually asymmetrical. Therefore, placing the elastic element 50 only on the main plane 11a or 11b with a larger expansion amount can effectively buffer the expansion of the battery cell 10 without excessively increasing the volume of the battery cell assembly 1.
[0061] In other embodiments of this disclosure, such as Figure 3 and Figure 6 As shown, elastic elements 50 are respectively disposed between the first fixed structural member 30 and the two main planes 11a and 11b. In other applications, the expansion amounts at the two main planes 11a and 11b are approximately equal, or although they are not equal, the expansion amounts at both main planes 11a and 11b are relatively large. In this case, elastic elements need to be disposed at both main planes 11a and 11b to meet the buffering expansion requirements of the cell assembly 1.
[0062] It should be understood that the "expansion amount" described above refers to a calculated or estimated value of the expansion amount calculated or simulated according to the design parameters of the battery cell and the use conditions, or an actual measured value of the expansion amount measured in an actual application or test environment. The expansion amount can be further calculated or simulated multiple times, or the average expansion amount measured multiple times, to more accurately design the thickness of the elastic member 50.
[0063] In some embodiments of the present disclosure, a battery module includes a case and at least one battery cell assembly in the above embodiments. The case is used to support and fix the battery cell assembly 1 and provide packaging for the battery cell assembly 1. In some embodiments, multiple battery cell assemblies 1 can be arranged in parallel or in series within the case. The number and connection mode of the battery cell assemblies 1 can be configured according to the desired voltage or current or other output parameters.
[0064] In some embodiments of the present disclosure, a battery pack includes a battery module in the above embodiments. Multiple battery modules can be integrated in the battery pack to provide greater electrical energy storage capacity and output power. For example, the battery pack can also include a battery management system (BMS), a cooling system, a housing, and a connector to monitor the normal operation of the battery module and provide the desired electrical energy output. It should be understood that the battery pack is a high-integration battery system that can provide electrical energy or store electrical energy as needed. In other embodiments of the present disclosure, the battery pack can be configured with connectors, switches, or other electrical components for external electrical connections as needed.
[0065] In some embodiments of the present disclosure, a power consuming device is provided, which includes a battery pack in the above embodiments for providing electrical energy. The power consuming device can be, for example, a car, a large-scale work platform, a portable digital product, or other electronic equipment.
[0066] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, and not to limit them; although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present disclosure, and they should be covered in the scope of the claims and the specification of the present disclosure. In particular, the technical features mentioned in each of the embodiments can be combined in any way as long as there is no structural conflict. The present disclosure is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.
Claims
1. A battery cell assembly, comprising: The battery cell has two main planes opposite each other along a first direction and two side planes opposite each other along a second direction; A frame, fitted over the outside of the battery cell, includes two first plates opposite each other along the second direction and two second plates for connecting the two first plates respectively, wherein the height of the first plates along the first direction is lower than the height of the battery cell along the first direction, so that the two sides of the side plane extend beyond the first plates along the first direction. A first fixing structure is disposed around the outside of the first plate and the battery cell, for pressing and holding the battery cell; and A second fixing structure is disposed around the outside of the first fixing structure, for further pressing and holding the battery cell via the first fixing structure.
2. The battery cell assembly according to claim 1, characterized in that, The battery cell assembly also includes: An elastic element is disposed between the first fixed structural member and the main plane to buffer the expansion of the battery cell.
3. The battery cell assembly according to claim 1, characterized in that, The first plate has rounded corners on both sides of its first direction to cushion the pressure exerted on the battery cell by the first and second fixing structures at the corners.
4. The cell assembly according to claim 1, characterized in that, At least one of the second plates is at a lower height along the first direction than the first plate along the first direction, so that the electrical connection portion of the battery cell extends out of the frame.
5. The cell assembly according to any one of claims 1 to 4, characterized in that, The first fixing structure includes wires or strips for being tightly wound around the outside of the first plate and the battery cell to press and hold the battery cell; The second fixing structure includes filaments or strips for being tightly wound around the outside of the first fixing structure to further compress and hold the battery cell via the first fixing structure.
6. The cell assembly according to claim 5, characterized in that, After the first fixing structure is wrapped around the outside of the first plate and the battery cell, an adhesive is applied to maintain the tension of the first fixing structure when the adhesive cures. The second fixing component is wrapped around the outside of the first fixing component after the adhesive of the first fixing component has cured; and The second fixing member is coated with the adhesive after being wrapped around the outside of the first fixing member, so as to maintain tension in the second fixing member when the adhesive cures.
7. The cell assembly according to claim 2, characterized in that, The elastic element is disposed only between the first fixed structural member and the main plane with the greater expansion amount along the first direction among the two main planes.
8. The cell assembly according to claim 2, characterized in that, The elastic elements are respectively disposed between the first fixed structural member and the two main planes.
9. A battery module comprising a housing and at least one cell assembly according to any one of claims 1-8.
10. A battery pack comprising the battery module according to claim 9.
11. An electrical device comprising a battery pack according to claim 10, the battery pack being used to provide electrical energy.