Battery cell assembly and battery pack

Abstract

The utility model relates to the technical field of battery packs, and discloses a battery cell assembly and a battery pack. The limiting plates extend along a preset direction, an arrangement position for arranging a battery cell group is formed between every two adjacent limiting plates, each limiting plate comprises a plate body and a plurality of limiting pieces, the plate body is provided with a matching surface, and the plurality of limiting pieces are arranged on the matching surface at intervals. After the battery cells are sequentially arranged in the box body in the preset direction, the limiting plates are placed on the two sides of the battery cells and attached to the battery cells, the corresponding limiting pieces are inserted into gaps between the battery cells and are in positioning fit with the ends of the battery cells at the moment, the limiting plates are simple in structure and small in occupied space, the volume utilization rate of the battery pack is increased, and meanwhile the battery pack is convenient to assemble and disassemble. The position of a single battery cell in a module-free scheme can be effectively limited, so that the assembling speed of the battery cell in the module-free scheme can be improved, and meanwhile, the position deviation of the battery cell pole is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cell assembly and a battery pack. Background Art

[0002] With the continuous development of new energy industry technologies, the design of battery packs is also constantly evolving. To improve the volume utilization rate of battery packs and enhance the layout flexibility of battery cells, the layout method of battery cells in battery packs is evolving from traditional small-module solutions to large-module or module-free solutions. Module-free means directly arranging the battery cells originally arranged in modules inside the battery pack, which can reduce the number of module packaging shells and external connection wire harnesses, thereby reducing the number of internal components of the battery pack, lowering the overall mass of the battery pack, and increasing the energy density of the battery pack.

[0003] Currently, in the existing module-free solutions, the battery cells are generally arranged by stacking one by one. It is necessary to hoist each single battery cell and the corresponding buffer material into the box one by one. The entire assembly process is time-consuming and laborious. At the same time, it is also impossible to effectively ensure the position accuracy of the sides of the stacked battery cells. Therefore, there is a problem of high assembly difficulty in the assembly process of battery cells in the existing module-free solutions. Summary of the Utility Model

[0004] In view of this, the utility model provides a battery cell assembly and a battery pack to solve the problem of high assembly difficulty of battery cells in the existing module-free solutions of battery packs.

[0005] In a first aspect, the utility model provides a battery cell assembly, including: a battery cell group including a plurality of battery cells arranged at intervals along a preset direction; a limiting plate extending along the preset direction, and a layout position for arranging the battery cell group is formed between adjacent two limiting plates. The limiting plate includes a plate body and a plurality of limiting members. The plate body has a fitting surface for fitting with the side part of the battery cell. The plurality of limiting members are arranged at intervals along the preset direction on the fitting surface, and an assembly position for arranging a single battery cell is formed between adjacent two limiting members.

[0006] By arranging a plurality of limiting members on the plate body of the limiting plate, after the battery cells are sequentially loaded into the box along the preset direction, the limiting plate is placed on both sides of the battery cells and fitted with the battery cells. At this time, the corresponding limiting members will insert into the gaps between the battery cells and be positioned and fitted with the ends of the battery cells. The structure of the limiting plate is simple and occupies less space. While improving the volume utilization rate of the battery pack, it can effectively limit the positions of single battery cells in the module-free solution, which can not only improve the assembly speed of battery cells in the module-free solution, but also reduce the position deviation of the battery cell poles, effectively solving the problem of high assembly difficulty of battery cells in the existing module-free solutions of battery packs.

[0007] In an alternative embodiment, the limiting member includes a limiting portion and a buffer portion. The limiting portion is connected to the plate body. The limiting portion has a limiting surface adapted to the shape of the end of the battery cell. The buffer portion is connected to the side of the limiting portion away from the plate body. The buffer portion is located in the gap between two adjacent battery cells. The limiting portion cooperates with the battery cell and can limit the battery cell along a preset direction, avoiding the random movement of the battery cell along the preset direction. The buffer portion located between two adjacent battery cells can play a buffering role when the battery cell expands, effectively improving the safety of the battery pack.

[0008] In an alternative embodiment, a groove is provided on the limiting member. The groove can be engaged by the tool clamping hand, facilitating the tool clamping hand to clamp the limiting plate. The limiting plate can be automatically moved into the box body of the battery pack by the tool clamping hand, facilitating the automated design of the assembly process.

[0009] In an alternative embodiment, the number of grooves is multiple and they are arranged at equal intervals along the height direction of the battery cell. Arranging the grooves in this way can make the structural strength of the limiting member along the height direction of the battery cell tend to be consistent, and the magnitude of the reaction force exerted on the battery cell during force application is more uniform.

[0010] In an alternative embodiment, both side surfaces of the plate body have mating surfaces, and a limiting member is provided on each mating surface. A single limiting plate can be applied to two rows of battery cells at the same time, effectively reducing the number of limiting plates used and reducing the assembly steps.

[0011] In an alternative embodiment, the limiting members located at the ends of the plate body along the preset direction form end components, and the limiting members located in the middle of the limiting plate form middle components. The end face of the end component away from the mating surface forms the first end face, and the end face of the middle component away from the mating surface forms the second end face. The distance from the first end face to the mating surface is greater than the distance from the second end face to the mating surface. The structural strength of the end component is higher. When the limiting plate of this form cooperates with the box body, it will be in abutting cooperation with the box body through the first end faces of the two side end components, effectively protecting the middle component.

[0012] In an alternative embodiment, the thickness of the end component is greater than the thickness of the middle component. The structural strength of the end component in this form is higher, which can improve the reliability and stability when abutting and cooperating with the box body of the battery pack.

[0013] In an alternative embodiment, the inside of the limiting plate has a cavity, which can effectively improve the buffering effect that the limiting plate can play while reducing the weight of the limiting plate.

[0014] In an alternative embodiment, a buffer structure is provided in the cavity, which can further improve the overall buffering effect of the limiting plate and improve the safety of the battery cell during operation.

[0015] In a second aspect, the present utility model further provides a battery pack, which includes: a box body; a battery cell assembly including a plurality of battery cells spaced apart and disposed inside the box body; and the above-mentioned battery cell assembly disposed inside the box body and in limiting cooperation with the battery cells. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 An exploded view of a battery cell assembly in cooperation with a battery cell according to an embodiment of the present utility model;

[0018] Figure 2 is Figure 1 a top view of the battery cell assembly shown;

[0019] Figure 3 is Figure 1 a top view of the battery cell assembly and the battery cell after cooperation shown;

[0020] Figure 4 is Figure 1 a top view of the battery cell assembly, the battery cell and the box body after assembly shown;

[0021] Figure 5 is Figure 1 a three-dimensional view of the limiting plate of the battery cell assembly shown;

[0022] Figure 6 is Figure 5 an enlarged view of part A of the limiting plate shown;

[0023] Figure 7 is Figure 5 a three-dimensional view of the limiting plate shown where the limiting member is only provided on one side of the plate body;

[0024] Figure 8 is Figure 5 a three-dimensional view of the limiting plate shown when the limiting member is provided with a groove;

[0025] Figure 9 is Figure 8 an enlarged view of part B of the limiting plate shown;

[0026] Figure 10 is Figure 8 an exploded view of the limiting plate in cooperation with the battery cell shown.

[0027] Description of the reference numerals:

[0028] 1. Limiting plate; 101. Plate body; 1011. Fitting surface; 102. Limiting member; 1021. Limiting portion; 10212. Limiting surface; 1022. Buffer portion; 1023. Groove; 1024. First end face; 1025. Second end face; 2. Battery cell; 3. Box body. Specific embodiments

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0030] The following will be combined with Figures 1 to 10 , to describe the embodiments of the present utility model.

[0031] According to an embodiment of the present utility model, on the one hand, a battery cell assembly is provided, including: a battery cell group and a limiting plate 1. The battery cell group includes a plurality of battery cells 2 arranged at intervals along a preset direction. The limiting plate 1 extends along the preset direction. A layout position for arranging the battery cell group is formed between adjacent two limiting plates 1. A plurality of battery cells 2 are adapted to be arranged at intervals along the preset direction in the layout position. The limiting plate 1 includes a plate body 101 and a plurality of limiting members 102. The plate body 101 has a fitting surface 1011 for fitting with the side portion of the battery cell 2. The plurality of limiting members 102 are arranged at intervals along the preset direction on the fitting surface 1011. An assembly position for arranging a single battery cell 2 is formed between adjacent two limiting members 102.

[0032] When applying the battery cell assembly of this embodiment, a plurality of limiting members 102 are provided on the plate body 101 of the limiting plate 1. For multiple rows of battery cells 2, first place the middle row of battery cells 2. That is, after loading the battery cells 2 into the box body 3 in sequence along the preset direction, place the limiting plate 1 on both sides of the battery cells 2 and fit it with the battery cells 2. At this time, the corresponding limiting members 102 will insert into the gaps between the battery cells 2 and be positioned and matched with the ends of the battery cells 2. Then, load the next row of battery cells 2 on the other side of the limiting plate 1, and then place another limiting plate 1 on the other side of the next row of battery cells 2 and fit it with the next row of battery cells 2, and so on for assembly. For the assembly of battery cell modules with fewer rows, the battery cells and the battery cell assembly can also be assembled and fitted together and then placed into the box body. The structure of the limiting plate 1 is simple and occupies less space. While improving the volume utilization rate of the battery pack, it can effectively limit the position of a single battery cell 2 in the module-free solution, which can not only improve the assembly speed of the battery cells 2 in the module-free solution, but also reduce the position deviation of the battery cell poles, effectively solving the problem of difficult assembly of battery cells in the existing module-free solution of the battery pack.

[0033] Among them, it should be noted that the specific orientation of the preset direction is not limited, and it can be, for example, Figure 1 the "horizontal" direction indicated by the arrow in Figure 1 or the "longitudinal" direction indicated by the arrow in

[0034] Preferably, the limiting plate 1 extends along the Figure 1 "longitudinal" direction indicated by the arrow in

[0035] This direction is the width direction of the battery cell 2. Since the arrangement direction of a single row of battery cells 2 is usually along the width direction, arranging the limiting plate 1 in this form can effectively reduce the number of required limiting plates 1 and the space occupied by the limiting plate 1.

[0036] Specifically, for the battery cells 2 in the same column arranged along the width direction, limiting plates 1 are provided on both sides along the length. At the same time, the limiting members 102 on the limiting plate 1 will limit the position of the battery cells 2 on both sides in the width direction of the battery cells 2. For this form of limiting plate 1, the battery cells 2 are separated from the box body 3 by the limiting plate 1 in both the length direction and the width direction, which can effectively improve the insulation strength between the battery cells 2 and the box body 3, and the limiting plate 1 can directly replace the original insulating parts.

[0036] Furthermore, the formation position of the mating surface 1011 on the plate body 101 is not strictly limited. It can be, for example, Figures 1 to 3 as shown, mating surfaces 1011 are formed on both sides of the plate body 101, and a single plate body 101 can cooperate with multiple battery cells 2 on both sides at the same time; it can also be, for example, Figure 7 as shown, only one side of the plate body 101 forms a mating surface 1011, and each column of battery cells 2 is limited by two limiting plates 1 together; it can be flexibly selected according to the usage requirements.

[0037] In this embodiment, the limiting member 102 includes a limiting portion 1021 and a buffer portion 1022. The limiting portion 1021 is connected to the plate body 101. The limiting portion 1021 has a limiting surface 10212 adapted to the shape of the end of the battery cell 2. The buffer portion 1022 is connected to the side of the limiting portion 1021 away from the plate body 101. The buffer portion 1022 is located in the gap between two adjacent battery cells 2. The limiting portion 1021 cooperates with the battery cell 2 and can limit the battery cell 2 along a preset direction, avoiding the random movement of the battery cell 2 along the preset direction. The buffer portion 1022 located between two adjacent battery cells 2 can play a buffering role when the battery cell 2 expands, effectively improving the safety of the battery pack. In addition, the buffer portion 1022 connected to the limiting portion 1021 can replace the original buffer structure, eliminating the need for additional independent buffer pads and silicone strips, reducing the number of individual components in the battery pack, improving the integration of components, and enhancing the production and manufacturing rhythm.

[0038] It should be noted that the end of the battery cell 2 refers to the part near both ends of the battery cell 2. The limiting surface 10212 can cooperate with the corner of the end of the battery cell 2 or the side wall of the end of the battery cell 2, and can be flexibly selected according to requirements.

[0039] Specifically, there is no limit to the length of the buffer portion 1022 along the "lateral" direction indicated by the arrow in Figure 1 One pair of corresponding buffer portions 1022 on the two plate bodies 101 can be in a form with a shorter length and spaced apart, or in a form with a longer length and in contact cooperation, and can be flexibly selected according to requirements.

[0040] Furthermore, as shown in Figure 6 In order to avoid stress concentration linearity when the limiting portion 1021 cooperates with the battery cell 2, the chamfer shape of the limiting surface 10212 of the limiting portion 1021 corresponds to and matches the edge position of the end of the battery cell 2, and the limiting surface 10212 corresponds to a curved surface.

[0041] In this embodiment, a groove 1023 is provided on the limiting member 102. The groove 1023 can be clamped by a tool clamping hand, facilitating the tool clamping hand to clamp the limiting plate 1. The limiting plate 1 can be automatically moved into the box body 3 of the battery pack by the tool clamping hand, facilitating the automated design of the assembly process.

[0042] There is no specific limit to the depth and shape of the groove 1023. The shape of the groove 1023 can be rectangular, arc-shaped, U-shaped, etc., and can be selected according to requirements and manufacturing convenience.

[0043] In this embodiment, the number of grooves 1023 is multiple, and they are arranged at equal intervals along the height direction of the battery cell 2. Arranging the grooves 1023 in this way can make the structural strength of the limiting member 102 along the height direction of the battery cell 2 tend to be consistent, and the magnitude of the reaction force exerted on the battery cell 2 during stress is more uniform. In addition, the multiple grooves 1023 can also effectively reduce the weight of the limiting member 102, better meet the requirements of lightweight, and improve the energy density of the battery pack.

[0044] It can be understood that as an alternative embodiment, the number of grooves 1023 can also be only one, as long as it is convenient for the tooling gripper to be inserted.

[0045] Among them, the height direction of the battery cell 2 refers to Figure 1 the "vertical" direction indicated by the arrow in

[0046] In this embodiment, both side surfaces of the plate body 101 have mating surfaces 1011, and limiting members 102 are provided on each mating surface 1011. A single limiting plate 1 can be applied to two rows of battery cells 2 at the same time, which can effectively reduce the number of limiting plates 1 used and reduce the assembly steps. In addition, for the limiting plate 1 opposite to the frame of the box body 3, since the limiting member 102 is provided on the corresponding mating surface 1011, at this time, the limiting plate 1 can be matched with the box body 3 through the limiting member 102, avoiding the direct contact between the plate body 101 and the box body 3 and ensuring the creepage distance.

[0047] In this embodiment, the limiting members 102 located at the ends of the plate body 101 form end components, and the limiting members 102 located in the middle of the limiting plate 1 form middle components. The end face of the end component away from the mating surface 1011 forms a first end face 1024, and the end face of the middle component away from the mating surface 1011 forms a second end face 1025. The distance from the first end face 1024 to the mating surface 1011 is greater than the distance from the second end face 1025 to the mating surface 1011. As Figure 6 shown, the structural strength of the end component is higher. When the limiting plate 1 of this form is matched with the box body 3, it will be in contact and cooperate with the box body 3 through the first end faces 1024 of the two side end components, which can effectively protect the middle component.

[0048] In this embodiment, the thickness of the end component is greater than the thickness of the middle component. The structural strength of the end component in this form is higher, which can improve the reliability and stability when it is in contact and cooperate with the box body 3 of the battery pack.

[0049] Among them, it should be noted that the thickness of the end component refers to Figure 1 the dimension in the "longitudinal" direction indicated by the arrow in

[0050] In this embodiment, the inside of the limiting plate 1 has a cavity, which can effectively improve the buffering effect that the limiting plate 1 can play while reducing the weight of the limiting plate 1.

[0051] Among them, the position of the cavity in the limiting plate 1 is not limited. The cavity can be inside either the plate body 101 or the limiting member 102, or both the plate body 101 and the limiting member 102 can have cavities.

[0052] In this embodiment, a buffer structure is provided in the cavity, which can further improve the overall buffering effect of the limiting plate 1 and enhance the safety of the battery cell 2 during operation.

[0053] Among them, the specific type of the buffer structure is not limited and can be flexibly selected according to requirements.

[0054] In this embodiment, the limiting plate 1 is a plastic integrally formed structure, which has better integrity, lighter weight, is easy to manufacture and is insulated. Compared with metal structural parts, it can improve the energy density of the battery pack.

[0055] According to an embodiment of the present invention, on the other hand, a battery pack is provided, which includes: a box body 3 and the above-mentioned battery cell assembly. The battery cell group includes a plurality of battery cells 2 arranged along a preset direction. The battery cells 2 are arranged at intervals inside the box body 3, and the above-mentioned battery cell assembly is arranged inside the box body 3 and is in limiting cooperation with the battery cells 2. Among them, the number of battery cell assemblies can be one group or multiple groups, and the arrangement positions of each battery cell assembly can also be one or more, and each arrangement position corresponds to one battery cell group.

[0056] In this embodiment, the battery pack further includes other necessary components such as a cooling component, an internal structural beam, and a control component.

[0057] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A battery cell assembly, characterized in that, Comprising: a battery cell group including a plurality of battery cells (2) spaced along a preset direction; a limiting plate (1) extending along the preset direction, a layout position for arranging the battery cell group is formed between two adjacent limiting plates (1), the limiting plate (1) includes a plate body (101) and a plurality of limiting members (102), the plate body (101) has a mating surface (1011) for mating with the side of the battery cell (2), and the plurality of limiting members (102) are spaced along the preset direction on the mating surface (1011), and an assembly position for arranging a single battery cell (2) is formed between two adjacent limiting members (102).

2. The cell assembly according to claim 1, wherein, The limiting member (102) includes a limiting portion (1021) and a buffer portion (1022), the limiting portion (1021) is connected to the plate body (101), the limiting portion (1021) has a limiting surface (10212) adapted to the shape of the end of the battery cell (2), the buffer portion (1022) is connected to the side of the limiting portion (1021) away from the plate body (101), and the buffer portion (1022) is located in the gap between two adjacent battery cells (2).

3. The cell assembly according to claim 1, wherein, A groove (1023) is provided on the limiting member (102).

4. The cell assembly according to claim 3, wherein, The number of the grooves (1023) is multiple, and they are equally spaced along the height direction of the battery cell (2).

5. The battery cell assembly according to any one of claims 1 to 4, characterized in that Both side surfaces of the plate body (101) have the mating surface (1011), and the limiting members (102) are provided on each mating surface (1011).

6. The cell assembly according to claim 5, characterized in that, The limiting members (102) located at the ends of the plate body (101) along the preset direction form end components, and the limiting members (102) located in the middle of the limiting plate (1) form middle components. The end face of the end component away from the mating surface (1011) forms a first end face (1024), and the end face of the middle component away from the mating surface (1011) forms a second end face (1025). The distance from the first end face (1024) to the mating surface (1011) is greater than the distance from the second end face (1025) to the mating surface (1011).

7. The cell assembly according to claim 6, wherein The thickness of the end component is greater than the thickness of the middle component.

8. The battery cell assembly according to any one of claims 1 to 4, characterized in that, The interior of the limiting plate (1) has a cavity.

9. The cell assembly according to claim 8, wherein A buffer structure is provided in the cavity.

10. A battery pack, characterized in that, Comprising: a box body (3); at least one battery cell assembly according to any one of claims 1 to 9, disposed inside the box body (3).

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