Buckle structure for cover plate and battery cell bracket and battery module

Abstract

The utility model discloses a buckle structure for a cover plate and a battery cell bracket and a battery module, and belongs to the technical field of batteries. The buckle structure comprises a first component and a second component, the first component is provided with a clamping hole, the clamping hole comprises a first hole part, a communicating part and a second hole part which are sequentially arranged and communicate with one another, and the clamping hole is in a contracted shape at the communicating part; the second component comprises a base body, a first buckle and a second buckle, the first buckle and the second buckle are arranged on the surface of the base body, the first buckle is connected with the first hole part in a clamped mode, and the second buckle is connected with the second hole part in a clamped mode. According to the buckle structure, the clamping hole can be prevented from being torn due to too large clamping force, the problem of clamping looseness caused by manufacturing tolerance and reserved gaps can be solved, and the clamping strength between the first component and the second component is improved. According to the battery module, the buckle structure is applied, so that the damage rate of the cover plate in the assembly process can be reduced even if the cover plate is a PC plate, the cost can be reduced, and the yield of products can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a snap-fit ​​structure for a cover plate and a cell support, and a battery module. Background Technology

[0002] A battery module mainly consists of a battery housing, cell brackets, and cell assemblies. The cell brackets are used to fix the cell assemblies, and both the cell brackets and cell assemblies are installed inside the battery housing. For the assembly of the cell assemblies, the battery housing is usually designed as a detachable, modular assembly structure. For example, the battery housing includes a main body and a cover. The cell brackets and cell assemblies are installed inside the main body, and then the cover is assembled.

[0003] In related technologies, to reduce costs and increase efficiency, PC boards are typically used for the cover plate, which is then snapped onto the battery cell support using circular clips. Because the head size of the clips on the battery cell support is larger than the size of the clip holes on the cover plate, and the PC board has relatively low strength, the clip holes on the PC board are easily cracked by the clip heads during the snapping process, leading to the scrapping of the PC board and increasing production costs. However, if the size of the clip holes is increased to avoid damage to the PC board, the snapping may be unreliable, resulting in ineffective installation, affecting product quality, and leading to a high defect rate.

[0004] This section provides background information related to this application, which is not necessarily prior art. Utility Model Content

[0005] The purpose of this application is to solve or at least alleviate some or all of the aforementioned problems. Therefore, the purpose of this application is to provide a snap-fit ​​structure for a cover plate and a cell support, as well as a battery module, so that even if a PC board is used for the cover plate, the damage rate of the cover plate during assembly can be reduced, thereby reducing costs and improving product yield.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] In a first aspect, a snap-fit ​​structure for a cover plate and a cell support is provided, comprising:

[0008] A first component has a locking hole, the locking hole comprising a first hole portion, a connecting portion, and a second hole portion arranged sequentially and connected to each other, and the locking hole is constricted at the connecting portion;

[0009] The second component includes a base and a first buckle and a second buckle disposed on the surface of the base, wherein the first buckle engages with the first hole and the second buckle engages with the second hole.

[0010] As an optional solution for the snap-fit ​​structure for the cover plate and the cell support, both the first hole and the second hole are rectangular holes, and the first hole and the second hole are arranged parallel to each other along the first direction and staggered in the second direction, wherein the first direction is perpendicular to the second direction.

[0011] As an alternative to the snap-fit ​​structure for the cover plate and the cell support, the first snap-fit ​​and the second snap-fit ​​are spaced apart along a first direction, and in the first direction, the distance between the first snap-fit ​​and the second snap-fit ​​is greater than the distance between the first hole and the second hole.

[0012] As an alternative to the snap-fit ​​structure for the cover plate and the cell support, the first snap-fit ​​has a first connecting portion and a first snap-fit ​​protrusion perpendicularly connected to the end of the first connecting portion, the first snap-fit ​​protrusion being able to pass through the first hole and abut against the first component; the second snap-fit ​​has a second connecting portion and a second snap-fit ​​protrusion perpendicularly connected to the end of the second connecting portion, the second snap-fit ​​protrusion being able to pass through the second hole and abut against the first component.

[0013] As an optional embodiment of the snap-fit ​​structure for the cover plate and the cell support, the first connecting portion and the second connecting portion are arranged parallel to each other and opposite to each other, and the first snap protrusion and the second snap protrusion are arranged parallel to each other and opposite to each other.

[0014] As an optional embodiment of the snap-fit ​​structure for the cover plate and the cell support, the second component further includes a support body disposed on the surface of the base, two supports bodies are spaced apart along the second direction, and the first snap-fit ​​and the second snap-fit ​​are located between the two supports bodies, and the support body can abut against the first component.

[0015] As an optional solution for the snap-fit ​​structure for the cover plate and the cell support, the distance between the support body and the surface of the base is H1, and the minimum distance between the first snap protrusion and the second snap protrusion and the surface of the base is H2, wherein 0.2mm≤H1-H2≤0.4mm.

[0016] As an optional solution for the snap-fit ​​structure for the cover plate and the cell support, the connecting part is a rectangular hole, and one of the two oppositely arranged sides of the connecting part coincides with one side of the first hole and the other side coincides with one side of the second hole.

[0017] As an optional embodiment of the snap-fit ​​structure for the cover plate and the cell support, the length of the connecting portion in the first direction is L1, and the interval between the first snap-fit ​​and the second snap-fit ​​in the first direction is L2, wherein 0.15mm≤L2-L1≤0.25mm.

[0018] Secondly, a battery module is provided, including a housing body, a cover plate, a cell bracket, and a cell assembly. The cell bracket and the cell assembly are both installed inside the housing body. The cover plate and the cell bracket are connected by a snap-fit ​​structure as described above.

[0019] The beneficial effects of this application are as follows:

[0020] The snap-fit ​​structure provided in this application includes a first component and a second component. For the snap-fit ​​hole of the first component, the connecting portion can distribute the force during the process of the first snap-fit ​​snapping into the first hole and the second snap-fit ​​snapping into the second hole, thereby preventing the snap-fit ​​hole from tearing due to excessive snapping force. In addition, since the snap-fit ​​hole is constricted in the connecting portion, the snapping strength between the first snap-fit ​​and the first hole and the snap-fit ​​strength between the second snap-fit ​​and the second hole can be guaranteed, eliminating the snapping loosening problem caused by manufacturing tolerances and reserved gaps, and improving the connection strength.

[0021] The battery module provided in this application, by applying the above-mentioned snap-fit ​​structure, can reduce the damage rate of the cover plate during the assembly process even if a PC board is used, thereby reducing costs and improving the product yield. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0023] Figure 1 A schematic diagram of the structure of the cover plate and cell support provided in the embodiment of this application after assembly is shown.

[0024] Figure 2 This paper shows a schematic diagram of the structure of the cover plate and cell support provided in the embodiment of this application before assembly.

[0025] Figure 3 A schematic diagram of the assembled snap-fit ​​structure provided in the embodiment of this application is shown.

[0026] Figure 4 A schematic diagram of the snap-fit ​​structure provided in this application embodiment before assembly is shown.

[0027] Figure label:

[0028] 100. Cover plate; 200. Cell support;

[0029] 1. First component; 11. Locking hole; 111. First hole portion; 112. Second hole portion; 113. Connecting portion;

[0030] 2. Second component; 21. Base; 22. First buckle; 221. First connecting part; 222. First buckle protrusion; 23. Second buckle; 231. Second connecting part; 232. Second buckle protrusion; 24. Support body. Detailed Implementation

[0031] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0032] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0033] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0034] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0035] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​not using relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0036] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0037] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0038] Figure 1 This paper shows a schematic diagram of the structure of the cover plate 100 and the cell support 200 after assembly according to an embodiment of this application. Figure 2 This diagram illustrates the structure of the cover plate 100 and the cell support 200 before assembly, as provided in an embodiment of this application. Figures 1 to 2 As shown, this application provides a battery module, including a box body, a cover plate 100, a cell bracket 200, and a cell assembly. The cell bracket 200 and the cell assembly are both installed inside the box body. The cell bracket 200 has several buckles, and the cover plate 100 has several locking holes 11. The buckles and locking holes 11 are connected one-to-one, thereby realizing the locking connection between the cover plate 100 and the cell bracket 200 to improve the assembly efficiency of the battery module.

[0039] In related technologies, to reduce costs and increase efficiency, PC boards are typically used for the cover plate, which is then snapped onto the battery cell support using circular clips. Because the head size of the clips on the battery cell support is larger than the hole size on the cover plate, and the PC board has relatively low strength, the holes in the PC board are easily cracked by the clip heads during the snapping process, leading to PC board failure and increased production costs. However, if the hole size is increased to avoid damage to the PC board, the snapping may be unreliable, resulting in ineffective installation, affecting product quality, and leading to a high defect rate.

[0040] To address the aforementioned issues, this application provides a snap-fit ​​structure for the cover plate 100 and the cell support 200, which reduces the damage rate of the cover plate 100 during assembly even when a PC board is used, thereby reducing costs and improving product yield.

[0041] Figure 3 A schematic diagram of the assembled snap-fit ​​structure provided in the embodiment of this application is shown. Figure 4 A schematic diagram of the snap-fit ​​structure provided in this application before assembly is shown. Figures 3 to 4 As shown, the buckle structure includes a first component 1 and a second component 2. The first component 1 has a buckle hole 11, which includes a first hole portion 111, a connecting portion 113, and a second hole portion 112 arranged and connected in sequence, and the buckle hole 11 is constricted at the connecting portion 113. The second component 2 includes a base 21 and a first buckle 22 and a second buckle 23 disposed on the surface of the base 21. The first buckle 22 engages with the first hole portion 111, and the second buckle 23 engages with the second hole portion 112.

[0042] For the locking hole 11 of the first component 1, the connecting portion 113 can distribute the force during the process of the first buckle 22 locking into the first hole portion 111 and the second buckle 23 locking into the second hole portion 112, thereby preventing the locking hole 11 from tearing due to excessive locking force; in addition, since the locking hole 11 is constricted in the connecting portion 113, the locking strength between the first buckle 22 and the first hole portion 111 and the locking strength between the second buckle 23 and the second hole portion 112 can be guaranteed, eliminating the problem of loosening caused by manufacturing tolerances and reserved gaps, and improving the connection strength.

[0043] When the snap-fit ​​structure provided in this application is used for snap-fit ​​connection between the cover plate 100 and the cell support 200, the first component 1 is the cover plate 100, and the second component 2 is the cell support 200. See [reference needed]. Figures 2 to 3As shown, the cover plate 100 has six locking holes 11 on its periphery. These six locking holes 11 are arranged in two groups on the two sides of the cover plate 100, with one locking hole 11 in the center of the cover plate 100. Similarly, the number and layout of the clips on the cell support 200 are the same as those of the locking holes 11, thus ensuring the connection strength between the cover plate 100 and the cell support 200. Of course, the number and layout of the locking holes 11 and the clips can be selected in other ways as needed, and are not limited here. It is understood that the locking structure provided in this application can also be used for snap-fit ​​connections between other plate-like components, and are not limited here.

[0044] See also Figures 3 to 4 As shown, both the first hole 111 and the second hole 112 are rectangular holes, and the first hole 111 and the second hole 112 are arranged parallel to each other along the first direction and staggered along the second direction, wherein the first direction is perpendicular to the second direction. This arrangement facilitates the processing of the locking hole 11, helps to improve the dimensional accuracy of the locking hole 11, and thus ensures the locking strength.

[0045] The connecting portion 113 is a rectangular hole, and one of the two opposite sides of the connecting portion 113 coincides with one side of the first hole portion 111, and the other side coincides with one side of the second hole portion 112. The overall shape of the locking hole 11 is roughly Z-shaped. This design facilitates the processing of the locking hole 11, helps to improve the dimensional accuracy of the locking hole 11, and thus ensures the locking strength.

[0046] The first buckle 22 and the second buckle 23 are spaced apart along the first direction, and the distance between the first buckle 22 and the second buckle 23 in the first direction is greater than the distance between the first hole 111 and the second hole 112, so as to ensure that the locking hole 11 can exert a converging force on the first buckle 22 and the second buckle 23 in the first direction, so as to ensure the locking strength after locking.

[0047] In this embodiment, the length of the connecting portion 113 in the first direction is L1, and the distance between the first latch 22 and the second latch 23 in the first direction is L2, wherein 0.15mm≤L2-L1≤0.25mm. This value range can ensure the snap-fit ​​strength between the latch and the snap hole 11, and reduce the probability of the snap hole 11 tearing due to excessive snap-fit ​​force, thereby improving the product yield. This is because if the difference between L2 and L1 is too small, the snap hole 11 will exert less force on the first latch 22 and the second latch 23, resulting in an unreliable snap-fit; if the difference between L2 and L1 is too large, the snap hole 11 will exert too much force on the first latch 22 and the second latch 23, resulting in a reliable snap-fit, but there is a risk that the snap hole 11 will tear due to excessive snap-fit ​​force.

[0048] The first buckle 22 has a first connecting portion 221 and a first latching protrusion 222 perpendicularly connected to the end of the first connecting portion 221. The first connecting portion 221 is connected to the base 21, and the first latching protrusion 222 can pass through the first hole 111 and abut against the first member 1. The second buckle 23 has a second connecting portion 231 and a second latching protrusion 232 perpendicularly connected to the end of the second connecting portion 231. The second connecting portion 231 is connected to the base 21, and the second latching protrusion 232 can pass through the second hole 112 and abut against the first member 1.

[0049] Furthermore, the first connecting portion 221 and the second connecting portion 231 are arranged parallel to each other and opposite to each other, and the first latching protrusion 222 and the second latching protrusion 232 are arranged parallel to each other and opposite to each other, so as to adapt to the first hole portion 111 and the second hole portion 112 which are arranged in a staggered manner, and ensure the latching strength between the buckle and the latching hole 11.

[0050] The second component 2 also includes a support body 24 disposed on the surface of the base 21. The two support bodies 24 are spaced apart along the second direction, and the first buckle 22 and the second buckle 23 are located between the two support bodies 24. The support body 24 can abut against the first component 1 to support the first component 1, ensure that the first component 1 is subjected to balanced force, and reduce the probability of the first component 1 being concave and deformed.

[0051] Furthermore, the distance between the support 24 and the surface of the base 21 is H1, and the minimum distance between the first locking protrusion 222 and the second locking protrusion 232 and the surface of the base 21 is H2, wherein 0.2mm≤H1-H2≤0.4mm. This range ensures that the support 24 and the first locking protrusion 222 and the second locking protrusion 232 can stably clamp the first component 1, thereby guaranteeing the connection strength between the first component 1 and the second component 2. This is because if the difference between H1 and H2 is too small, the clamping force of the support 24 and the first locking protrusion 222 and the second locking protrusion 232 on the first component 1 will be too large, which may easily cause the first component 1 to be squeezed, deformed, or even torn; if the difference between H1 and H2 is too large, the clamping force of the support 24 and the first locking protrusion 222 and the second locking protrusion 232 on the first component 1 will be too small, the clamping will be unreliable, and there may even be a risk of the first component 1 shaking up and down.

[0052] Based on the above analysis, the following solutions are provided for the latch 11, the first latch 22, and the second latch 23: The first hole 111 and the second hole 112 have the same dimensions, both with a length of 2.4 mm in the first direction and 2.45 mm in the second direction. The connecting portion 113 has a length of 1.2 mm in the second direction and 0.3 mm in the first direction. The first latching protrusion 222 and the second latching protrusion 232 have the same dimensions, both with a length of 2.2 mm in the first direction and 2.25 mm in the second direction. The first connecting portion 221 and the second connecting portion 231 have the same dimensions, both with a length of 2.25 mm in the first direction and 1 mm in the second direction. The distance between them and the surface of the base 21 is 6.3 mm, and the interval between them in the first direction is 0.5 mm. The support 24 has a length of 7.15 mm in the first direction, a length of 1.3 mm in the second direction, and a distance of 6.69 mm from the surface of the base 21.

[0053] During the engagement of the first component 1 and the second component 2, since the first latch 222 and the second latch 23 are positioned opposite to each other, the wall of the latch hole 11 can apply reverse pressure to the first latch 222 and the second latch 232, causing the first connecting part 221 and the second connecting part 231 to deform. When the first latch 222 is just engaged with the first hole 111 and the second latch 232 is just engaged with the second hole 112, the first latch 222 and the second latch 232 are no longer subjected to the force of the wall of the latch hole 11. At this time, the first connecting part 221 and the second connecting part 231 return to their original state, and the first latch 222 and the second latch 232 are both engaged with the first component 1, achieving a self-locking effect.

[0054] In other words, the snap-fit ​​structure provided in this application designs the snap-fit ​​hole 11 as two staggered first hole portions 111 and second hole portions 112, and the snap-fit ​​as two independently set first snap-fits 22 and second snap-fits 23 facing opposite directions. This can avoid mutual deformation and limiting. On the one hand, it can increase the amount of deformation, which is convenient for installation and prevents the first component 1 from being torn at the snap-fit ​​hole 11. On the other hand, the snap-fit ​​rebound amount is increased, which can eliminate the problem of unreliable snap-fit ​​caused by manufacturing tolerances and reserved gaps, improve the snap-fit ​​strength, and prevent the first component 1 and the second component 2 from separating due to vibration.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. A snap-fit ​​structure for a cover plate and a battery cell support, characterized in that, include: The first component (1) has a locking hole (11), which includes a first hole (111), a connecting part (113), and a second hole (112) arranged and connected in sequence, and the locking hole (11) is constricted at the connecting part (113); The second component (2) includes a base (21) and a first buckle (22) and a second buckle (23) disposed on the surface of the base (21). The first buckle (22) engages with the first hole (111), and the second buckle (23) engages with the second hole (112).

2. The snap-fit ​​structure for the cover plate and the cell support according to claim 1, characterized in that, Both the first hole (111) and the second hole (112) are rectangular holes, and the first hole (111) and the second hole (112) are arranged parallel to each other along the first direction and staggered in the second direction, wherein the first direction is perpendicular to the second direction.

3. The snap-fit ​​structure for the cover plate and the cell support according to claim 2, characterized in that, The first buckle (22) and the second buckle (23) are spaced apart along a first direction, and in the first direction, the gap between the first buckle (22) and the second buckle (23) is greater than the gap between the first hole (111) and the second hole (112).

4. The snap-fit ​​structure for the cover plate and the cell support according to claim 3, characterized in that, The first buckle (22) has a first connecting portion (221) and a first latching protrusion (222) vertically connected to the end of the first connecting portion (221). The first latching protrusion (222) can pass through the first hole (111) and abut against the first member (1). The second buckle (23) has a second connecting portion (231) and a second latching protrusion (232) vertically connected to the end of the second connecting portion (231). The second latching protrusion (232) can pass through the second hole (112) and abut against the first member (1).

5. The snap-fit ​​structure for the cover plate and the cell support according to claim 4, characterized in that, The first connecting portion (221) and the second connecting portion (231) are arranged parallel to each other and opposite to each other, and the first card protrusion (222) and the second card protrusion (232) are arranged parallel to each other and opposite to each other.

6. The snap-fit ​​structure for the cover plate and the cell support according to claim 5, characterized in that, The second component (2) further includes a support (24) disposed on the surface of the base (21), the two supports (24) are spaced apart along the second direction, and the first buckle (22) and the second buckle (23) are located between the two supports (24), and the support (24) can abut against the first component (1).

7. The snap-fit ​​structure for the cover plate and the cell support according to claim 6, characterized in that, The distance between the support (24) and the surface of the base (21) is H1, and the minimum distance between the first card protrusion (222) and the second card protrusion (232) and the surface of the base (21) is H2, wherein 0.2mm≤H1-H2≤0.4mm.

8. The snap-fit ​​structure for the cover plate and the cell support according to any one of claims 2-7, characterized in that, The connecting part (113) is a rectangular hole, and one of the two oppositely arranged sides of the connecting part (113) coincides with one side of the first hole (111), and the other side coincides with one side of the second hole (112).

9. The snap-fit ​​structure for the cover plate and the cell support according to claim 8, characterized in that, The length of the connecting part (113) in the first direction is L1, and the distance between the first buckle (22) and the second buckle (23) in the first direction is L2, wherein 0.15mm≤L2-L1≤0.25mm.

10. A battery module, characterized in that, The device includes a main body, a cover plate, a cell support, and a cell assembly. The cell support and the cell assembly are both installed inside the main body. The cover plate and the cell support are connected by a snap-fit ​​structure as described in any one of claims 1-9.

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