Battery pack

Abstract

The utility model provides a kind of battery pack, battery pack includes: battery compartment, including bottom plate and the surrounding board of surrounding in the bottom plate outer periphery, bottom plate and surrounding board form installation space;Battery group is set in installation space, and there is interval between the outside of battery group and surrounding board;Connecting colloid is set in interval and is connected with surrounding board and battery group, and it is provided with accommodating space in connecting colloid;Buffering member is set in accommodating space;Wherein, the connecting area between connecting colloid and battery group is first connecting area M1, the surface area of battery group corresponding to interval is first surface area M2, the ratio between first connecting area M1 and first surface area M2 is greater than or equal to 1.7% and less than or equal to 46%, and the unit of first connecting area M1 and first surface area M2 is cm 2 The technical scheme of the present application effectively solves the problem of balancing the connection effect and buffering effect of the battery group and the battery pack frame in the related art.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery pack. Background Technology

[0002] In related technologies, in order to meet the installation requirements of battery packs, a certain gap is usually reserved to compensate for processing and assembly tolerances. Therefore, there is usually a gap between the battery pack and the battery pack frame after the battery pack is assembled.

[0003] For the aforementioned gap, the existing treatment method is generally to fill the gap with glue or to place a buffer material in the gap. However, if a buffer material is placed directly in the gap, it will affect the connection stability between the battery pack side and the battery pack frame; if glue is filled in the gap, it will squeeze the battery expansion space and occupy the space for the side frame to collapse and absorb energy. Utility Model Content

[0004] The main objective of this invention is to provide a battery pack that solves the problem in related technologies of the difficulty in balancing the connection effect and buffering effect between the battery pack and the battery pack frame.

[0005] To achieve the above objectives, this utility model provides a battery pack, comprising: a battery compartment including a base plate and a surrounding plate enclosing the base plate, the base plate and the surrounding plate forming an installation space; a battery pack disposed within the installation space, with a gap between the outer side of the battery pack and the surrounding plate; a connecting adhesive disposed within the gap and connected to both the surrounding plate and the battery pack, the connecting adhesive containing a receiving space; and a buffer disposed within the receiving space; wherein the connection area between the connecting adhesive and the battery pack is a first connection area M1, the surface area of ​​the battery pack corresponding to the gap is a first surface area M2, the ratio between the first connection area M1 and the first surface area M2 is greater than or equal to 1.7% and less than or equal to 46%, and the units of the first connection area M1 and the first surface area M2 are cm. 2 And / or, the connection area between the connecting colloid and the enclosure is the second connection area M3, the surface area of ​​the enclosure corresponding to the gap is the second surface area M4, the ratio between the second connection area M3 and the second surface area M4 is greater than or equal to 2% and less than or equal to 46%, and the units of the second connection area M3 and the second surface area M4 are cm. 2 .

[0006] Applying the technical solution of this utility model, the battery pack is installed in the installation space inside the battery compartment. There is a gap between the outer side of the battery pack and the battery compartment's surrounding plate. The connecting adhesive is used to connect the surrounding plate and the battery pack to ensure the stability of the connection between the battery pack and the battery compartment's surrounding plate and to prevent the battery pack from shifting significantly during use. The buffer is installed in the receiving space of the connecting adhesive. When the battery pack is impacted and the surrounding plate deforms towards the battery pack, the buffer can avoid the deformation of the surrounding plate and absorb the inward impact force applied during the deformation process. This gives the battery pack good buffering ability and prevents damage to the battery pack. At the same time, the buffer also leaves space for the battery pack to expand during charging. In this application, by simultaneously providing connecting adhesive and buffer components within the gap between the battery pack and the battery compartment, both the connection effect between the battery pack and the battery compartment's enclosure is ensured, and the buffer components also provide collapsible energy absorption against deformation of the enclosure, thus improving the safety of the battery pack during use. Furthermore, by ensuring that the ratio between the first connection area M1 and the first surface area M2 and / or the ratio between the second connection area M3 and the second surface area M4 are within the aforementioned range, the amount of connecting adhesive used can be minimized while maintaining a good connection effect, and more space can be provided for the buffer components. This effectively reduces the cost and weight of the battery pack while ensuring a good cushioning effect. Therefore, the technical solution of this application effectively solves the problem in related technologies where it is difficult to simultaneously achieve both the connection effect and the cushioning effect between the battery pack and the battery pack frame. Attached Figure Description

[0007] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0008] Figure 1 A perspective structural schematic diagram of an embodiment of a battery pack according to the present invention is shown, wherein the battery pack includes a plurality of prismatic batteries;

[0009] Figure 2 It shows Figure 1 A top view of the battery pack;

[0010] Figure 3 It shows Figure 2 A magnified view of point A on the battery pack;

[0011] Figure 4 It shows Figure 1 A side cross-sectional view of the battery pack;

[0012] Figure 5 It shows Figure 4 A magnified view of point B on the battery pack;

[0013] Figure 6 A perspective structural schematic diagram of an embodiment of a battery pack according to the present invention is shown, wherein the battery pack includes a plurality of cylindrical batteries;

[0014] Figure 7 It shows Figure 6 A top view of the battery pack;

[0015] Figure 8 It shows Figure 6 A side cross-sectional view of the battery pack;

[0016] Figure 9 A top view schematic diagram of an embodiment of the battery pack according to the present invention is shown, wherein the connection between the gel block and the buffer block has a serrated structure;

[0017] Figure 10 It shows Figure 9 A magnified view of point C on the battery pack;

[0018] Figure 11 A top view schematic diagram of an embodiment of the battery pack according to the present invention is shown, wherein the cross-section of the gel block is trapezoidal;

[0019] Figure 12 A top view schematic diagram of an embodiment of the battery pack according to the present invention is shown, wherein the cross-section of the gel block is a rectangular structure;

[0020] Figure 13 A top view schematic diagram of an embodiment of the battery pack according to the present invention is shown, wherein the cross-section of the gel block has a spindle-shaped structure.

[0021] The above figures include the following reference numerals:

[0022] 10. Battery compartment; 11. Base plate; 12. Enclosure;

[0023] 20. Battery pack;

[0024] 30. Connecting colloid; 31. Through hole; 32. Colloid block;

[0025] 40. Buffer component; 41. Buffer block. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] like Figures 1 to 5As shown, this application provides a battery pack. An embodiment of the battery pack includes: a battery compartment 10, a battery pack 20, a connecting adhesive 30, and a buffer 40. The battery compartment 10 includes a base plate 11 and a surrounding plate 12 enclosing the base plate 11, forming an installation space. The battery pack 20 is disposed within the installation space, with a gap between the outer surface of the battery pack 20 and the surrounding plate 12. The connecting adhesive 30 is disposed within the gap and connected to both the surrounding plate 12 and the battery pack 20, and has a receiving space within it. The buffer 40 is disposed within the receiving space. The connection area between the connecting adhesive 30 and the battery pack 20 is a first connection area M1, and the surface area of ​​the battery pack 20 corresponding to the gap is a first surface area M2. The ratio between the first connection area M1 and the first surface area M2 is greater than or equal to 1.7% and less than or equal to 46%. The units for the first connection area M1 and the first surface area M2 are cm. 2 And / or, the connection area between the connecting colloid 30 and the surrounding plate 12 is the second connection area M3, the surface area of ​​the surrounding plate 12 corresponding to the gap is the second surface area M4, the ratio between the second connection area M3 and the second surface area M4 is greater than or equal to 2% and less than or equal to 46%, and the units of the second connection area M3 and the second surface area M4 are cm. 2 .

[0030] Applying the technical solution of this embodiment, the battery pack 20 is installed in the installation space within the battery compartment 10. There is a gap between the outer side of the battery pack 20 and the surrounding plate 12 of the battery compartment 10. The connecting adhesive 30 is used to connect the surrounding plate 12 and the battery pack 20 to ensure the stability of the connection between the battery pack 20 and the surrounding plate 12 of the battery compartment 10, and to prevent the battery pack 20 from undergoing large-scale displacement during use. The buffer 40 is installed in the receiving space of the connecting adhesive 30. When the battery pack is impacted and the surrounding plate 12 deforms toward the battery pack 20, the buffer 40 can avoid the deformation of the surrounding plate 12 and absorb the inward impact force applied during the deformation of the surrounding plate 12, thereby giving the battery pack good buffering ability and preventing damage to the battery pack 20. At the same time, the buffer 40 also provides space for the battery pack 20 to expand during charging. In this embodiment, by simultaneously providing a connecting adhesive 30 and a buffer 40 within the gap between the enclosure 12 and the battery pack 20, the connection effect between the battery pack 20 and the enclosure 12 of the battery compartment 10 can be ensured, and the buffer 40 can also have a collapsible energy absorption effect on the deformation of the enclosure 12, which is beneficial to improving the safety of the battery pack 20 during use. Furthermore, by ensuring that the ratio between the first connection area M1 and the first surface area M2 and / or the ratio between the second connection area M3 and the second surface area M4 are within the aforementioned range, the material used for the connecting adhesive 30 can be minimized while maintaining a good connection effect, and more space can be provided for the buffer 40. This effectively reduces the cost and weight of the battery pack while ensuring a cushioning effect. Therefore, the technical solution of this embodiment can effectively solve the problem in related technologies where it is difficult to simultaneously achieve both the connection effect and the cushioning effect between the battery pack and the battery pack frame.

[0031] Specifically, the enclosure 12 can be a smooth, one-piece structure or a multi-segment structure connected by a fixing device. The shape of the enclosure 12 can be ring-shaped, rectangular, or other polygonal.

[0032] In this embodiment, by simultaneously setting buffer 40 and connecting adhesive 30 within the interval, the connection effect and buffering effect between battery pack 20 and enclosure 12 can be taken into account. At the same time, connecting adhesive 30 and buffer 40 can also achieve heat preservation of the battery and prevent heat exchange between batteries.

[0033] Preferably, the ratio between the first connecting area M1 and the first surface area M2 satisfies greater than or equal to 1.7% and less than or equal to 46%, and the ratio between the second connecting area M3 and the second surface area M4 satisfies greater than or equal to 2% and less than or equal to 46%; or, the ratio between the first connecting area M1 and the first surface area M2 satisfies greater than or equal to 1.7% and less than or equal to 46%, and the ratio between the second connecting area M3 and the second surface area M4 is not limited; or, the ratio between the first connecting area M1 and the first surface area M2 is not limited, and the ratio between the second connecting area M3 and the second surface area M4 satisfies greater than or equal to 2% and less than or equal to 46%.

[0034] Preferably, the ratio between the first connecting area M1 and the first surface area M2 can be 1.7%, 13%, 24%, 35%, or 46%, and the ratio between the second connecting area M3 and the second surface area M4 can be 2%, 13%, 24%, 35%, or 46%.

[0035] like Figures 1 to 3 As shown, the projected area of ​​the buffer 40 on the outer surface of the battery pack 20 is the projected area M5. The first surface area M2 and the projected area M5 satisfy 53% ≤ M5 / M2 ≤ 99.3%. The unit of the projected area M5 is cm. 2 By ensuring that the ratio of the first surface area M2 to the projected area M5 is within the aforementioned range, the amount of buffer 40 and the amount of connecting adhesive 30 can be kept within a suitable range, thus balancing the connection effect and buffering effect between the battery pack 20 and the enclosure 12 of the battery compartment 10.

[0036] like Figure 3 , Figure 4 and Figure 5 As shown, in one embodiment, the connecting adhesive 30 has a through hole 31 extending vertically, wherein 53% ≤ M5 / M2 ≤ 80%. The through hole 31 serves as a collapse space. When the battery pack is impacted, causing the surrounding plate 12 to deform towards the battery pack 20, the through hole 31 can collapse and deform accordingly to accommodate the deformation of the surrounding plate 12. This arrangement gives the connecting adhesive 30 a certain buffering performance, thereby reducing the amount of buffer 40 used and increasing the connection area between the connecting adhesive 30 and the battery pack 20 and the surrounding plate 12, further improving the connection effect while ensuring buffering performance. Preferably, M5 / M2 can be 53%, 66.5%, or 80%.

[0037] The through-hole 31 on the connecting colloid 30 may not contain any other structure, or it may contain a material that can act as a buffer.

[0038] like Figures 1 to 3As shown, in one embodiment, the buffer 40 is in contact with both the enclosure 12 and the battery pack 20, wherein 53% ≤ M5 / M2 ≤ 90%. The connection between the buffer 40 and both the enclosure 12 and the battery pack 20 helps prevent the buffer 40 from shifting in the gaps and affecting the buffering performance of the battery pack. In this embodiment, by keeping the ratio of the first surface area M2 to the projected area M5 within the aforementioned range, both the connection effect between the battery pack and the battery pack frame and the buffering effect are considered. Preferably, M5 / M2 can be 53%, 71.5%, or 90%.

[0039] like Figures 1 to 3 As shown, in one embodiment, the battery pack 20 has a rectangular cross-section. The outer side of the rectangular structure corresponding to the short side is directly connected to the surrounding plate 12, with a gap formed between the outer side of the rectangular structure corresponding to the long side and the surrounding plate 12, wherein 65% ≤ M5 / M2 ≤ 99.3%. Since there is no gap between the outer side of the rectangular structure corresponding to the short side and the surrounding plate 12, the connection effect between the outer side of the rectangular structure corresponding to the short side and the surrounding plate 12 is ensured. Correspondingly, the connection area between the outer side of the rectangular structure corresponding to the long side and the surrounding plate 12 can be reduced accordingly, and the amount of buffer 40 can be increased to ensure that the gap between the outer side of the rectangular structure corresponding to the long side and the surrounding plate 12 has sufficient collapsible space. Preferably, M5 / M2 can be 65%, 82.15%, or 99.3%.

[0040] It should be noted that the phrase "the outer surface corresponding to the short side of the rectangular structure is directly connected to the enclosure 12" means that there is no other structure between the two except for the adhesive used to connect them. In describing the embodiments of this application, "lateral" and "vertical" refer to the directions parallel to the bottom plate 11 of the battery compartment 10 and perpendicular to the bottom plate 11 of the battery compartment 10, respectively.

[0041] In one embodiment, the spacing is an annular gap formed around the outer periphery of the battery pack 20, wherein 53% ≤ M5 / M2 ≤ 90%. In this case, there is an annular gap between the battery pack 20 and the surrounding plate 12, requiring an increase in the connection area between the outer surface of the battery pack 20 and the surrounding plate 12 to ensure the connection effect between the battery pack 20 and the surrounding plate 12. Therefore, the amount of buffer 40 needs to be appropriately reduced. Preferably, M5 / M2 can be 53%, 71.5%, or 90%.

[0042] like Figures 6 to 8As shown, in one embodiment, the battery pack 20 includes multiple cylindrical batteries, wherein 53% ≤ M5 / M2 ≤ 78%. Since the cylindrical batteries are loosely fixed within the battery pack, a larger bonding area is required between the battery pack 20 and the surrounding plate 12 to ensure a good connection. Therefore, the amount of buffer 40 needs to be reduced accordingly, while the amount of connecting adhesive 30 needs to be increased. Preferably, M5 / M2 can be 53%, 65.5%, or 78%.

[0043] like Figures 1 to 3 As shown, in one embodiment, the battery pack 20 includes multiple prismatic batteries, wherein 65% ≤ M5 / M2 ≤ 99.3%. Compared to cylindrical batteries, prismatic batteries are more compactly fixed in the battery pack. To ensure a good cushioning effect between the battery pack 20 and the surrounding plate 12, a larger crumple zone is required between the battery pack 20 and the surrounding plate 12. Therefore, the amount of buffer 40 needs to be increased accordingly, and the amount of connecting adhesive 30 needs to be reduced. Preferably, M5 / M2 can be 65%, 82.15%, or 99.3%.

[0044] In one embodiment, the buffer 40 contacts the enclosure 12 and is spaced from the battery pack 20, wherein 63% ≤ M5 / M2 ≤ 99.3%. Since the buffer 40 only contacts the enclosure 12 on one side and not the battery pack 20, meaning the buffer 40 has a smaller dimension in the width direction of the gap, its buffering capacity is weakened. Therefore, it is necessary to increase the surface area of ​​the buffer 40 to ensure the buffering effect. Preferably, M5 / M2 can be 63%, 76.15%, or 99.3%.

[0045] In one embodiment, the buffer 40 is spaced from the enclosure 12 and contacts the battery pack 20, wherein 63% ≤ M5 / M2 ≤ 99.3%. Since the buffer 40 only contacts the battery pack 20 on one side and not the enclosure 12, meaning the buffer 40 has a smaller dimension in the width direction of the gap, its buffering capacity is weakened. Therefore, it is necessary to increase the surface area of ​​the buffer 40 to ensure the buffering effect. Preferably, M5 / M2 can be 63%, 76.15%, or 99.3%.

[0046] like Figure 2 and Figure 6 As shown, the buffer 40 is in contact with both the enclosure 12 and the battery pack 20. The fact that the buffer 40 is connected to both the enclosure 12 and the battery pack 20 helps prevent the buffer 40 from moving within the gap and affecting the buffering performance of the battery pack. Furthermore, the buffer 40 provides buffering in the width direction of the gap, thus offering excellent buffering performance.

[0047] like Figure 2 , Figure 7 , Figure 9 , Figure 11 , Figure 12 and Figure 13 As shown, the connecting colloid 30 includes multiple colloid blocks 32, and the buffer 40 includes multiple buffer blocks 41. The multiple buffer blocks 41 and colloid blocks 32 are alternately arranged in the transverse direction. The alternating arrangement of the multiple buffer blocks 41 and colloid blocks 32 in the transverse direction is beneficial to the arrangement and shaping of the connecting colloid 30 and the buffer 40.

[0048] In a preferred embodiment, the buffer 40 is a segmented foam structure. Segmented foam is provided between the battery pack 20 and the surrounding plate 12, and the gaps between the foam are filled with potting compound (which solidifies to form a connecting compound 30). The connecting compound 30 increases the connection strength between the battery pack 20 and the surrounding plate 12, thereby improving the overall rigidity, strength, and modal characteristics of the battery pack. At the same time, the segmented foam ensures that the surrounding plate 12 can collapse and absorb energy under collision and compression conditions, preventing the compression force from directly acting on the battery pack 20 and causing battery damage. This improves the safety of the battery pack under harsh conditions or environments (e.g., off-road environments, vehicles that have not been maintained for a long time). The connecting compound 30 increases the load transfer path between the battery pack 20 and the overall pack fixing point, reduces the load of the battery pack 20 on the base plate 11, and improves mechanical safety. The combined use of foam and potting compound effectively reduces the amount of potting compound used, which is beneficial for reducing the weight and cost of the battery pack. In other feasible embodiments, the buffer 40 may be a plurality of buffer particles dispersed in the connecting colloid 30, wherein the liquid colloid contains the aforementioned buffer particles when the connecting colloid 30 is formed.

[0049] Specifically, regarding the arrangement and molding of the buffer 40 and the connecting adhesive 30, the buffer block 41 is first placed in the gap between the battery pack 20 and the surrounding plate 12, and then adhesive is poured into the gap between the battery pack 20 and the surrounding plate 12. The potting adhesive will enter the empty space in the gap between the battery pack 20 and the surrounding plate 12, and the connecting adhesive 30 is formed after the adhesive solidifies.

[0050] In one embodiment, the vertical cross-sectional area of ​​the gel block 32 located at the middle of the outer side of the battery pack 20 in the lateral direction is larger than the vertical cross-sectional area of ​​the gel block 32 located at the ends of the outer side of the battery pack 20 in the lateral direction. Compared to the ends of the battery pack 20, the middle part of the battery pack 20 receives weaker support, resulting in a relatively larger vertical cross-sectional area of ​​the gel block 32 in the middle part of the battery pack 20, which is beneficial to improving the support effect on the middle part of the battery pack 20.

[0051] Specifically, the "vertical cross-sectional area" mentioned above refers to the cross-sectional area obtained by the surface parallel to the outer side of the battery pack 20.

[0052] like Figure 2 , Figure 7 and Figure 13As shown, the width of the colloid block 32 first decreases and then increases in the direction from the outer side of the battery pack 20 to the surrounding plate 12. The width of the colloid block 32 in the direction from the outer side of the battery pack 20 to the surrounding plate 12 satisfies the above conditions, which can improve the deformation effect of the connecting colloid 30. When the battery pack is impacted and the surrounding plate 12 deforms towards the battery pack 20, the connecting colloid 30 can also provide a certain degree of avoidance for the deformation of the surrounding plate 12. At the same time, the width of the colloid block 32 first decreases and then increases, which can ensure both the bonding area and the sufficient volume of the buffer 40, so as to take into account the overall connection effect and buffering effect of the battery pack.

[0053] It should be noted that the “width of the colloidal block 32” mentioned above refers to the lateral dimension of the cross-section of the colloidal block 32 obtained by the surface parallel to the outer side of the battery pack 20.

[0054] Preferably, such as Figures 9 to 13 As shown, the shape of the cross-section of the colloidal block 32 cut by the plane perpendicular to the outer side of the battery pack 20 and / or the surrounding plate 12 can be serrated, dumbbell-shaped, or honeycomb-shaped. Correspondingly, the shape of the cross-section of the buffer block 41 cut by the plane perpendicular to the outer side of the battery pack 20 and / or the surrounding plate 12 can be rectangular, spindle-shaped, elliptical, trapezoidal, or polygonal.

[0055] In one embodiment, the elastic modulus of the buffer 40 is greater than or equal to 0.01 MPa and less than or equal to 20 MPa. By making the elastic modulus of the buffer 40 less than that of the connecting colloid 30 and within the aforementioned range, the buffer 40 can have sufficient deformation capacity, thereby ensuring sufficient collapse space between the battery pack 20 and the enclosure 12, while also taking into account the availability of the material of the buffer 40 and reducing its cost. Preferably, the elastic modulus of the buffer 40 can be 0.01 MPa, 10 MPa, or 20 MPa.

[0056] Furthermore, the flame retardancy of the material for the buffer component 40 must be considered when selecting the material to prevent the battery thermal runaway from igniting the buffer component 40 during use, thereby expanding the degree and scope of thermal runaway. Preferably, while ensuring the flame retardancy of the material for the buffer component 40, flexible materials such as rubber, sponge, foam, and cotton foam can be selected.

[0057] like Figure 2 and Figure 7As shown, the buffer 40 is interference-fitted with both the enclosure 12 and the battery pack 20. This interference fit helps prevent the buffer 40 from shifting within the gaps, thus affecting the battery pack's cushioning performance. Specifically, during battery pack assembly, the battery pack 20 is typically placed inside the battery compartment 10 first, then the buffer 40 is placed in the gap between the battery pack 20 and the enclosure 12. Then, potting compound is poured into the gap between the battery pack 20 and the enclosure 12. The potting compound enters the empty spaces within the gap between the battery pack 20 and the enclosure 12. After solidification, the potting compound forms a connecting adhesive 30. The interference fit between the buffer 40 and the enclosure 12 and the battery pack 20 ensures that the battery pack 20 remains stable and does not shift before the potting compound is applied.

[0058] In the description of this utility model, it should be understood that "multiple" means two or more. Directional terms such as "front, back, up, down, left, right," "horizontal, vertical, perpendicular, horizontal," and "top, bottom" indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are used solely for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner or outer contours relative to the outline of each component itself.

[0059] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0060] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0061] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A battery pack, characterized in that, include: The battery compartment (10) includes a base plate (11) and a surrounding plate (12) surrounding the base plate (11), wherein the base plate (11) and the surrounding plate (12) form an installation space; A battery pack (20) is disposed within the installation space, and there is a gap between the outer side of the battery pack (20) and the enclosure (12); A connecting colloid (30) is disposed within the interval and connected to both the enclosure plate (12) and the battery pack (20). The connecting colloid (30) has a receiving space. A buffer element (40) is disposed within the receiving space; wherein, The connection area between the connecting colloid (30) and the battery pack (20) is the first connection area M1, and the surface area of ​​the battery pack (20) corresponding to the interval is the first surface area M2. The ratio between the first connection area M1 and the first surface area M2 is greater than or equal to 1.7% and less than or equal to 46%. The units of the first connection area M1 and the first surface area M2 are cm. 2 , and / or The connection area between the connecting colloid (30) and the surrounding plate (12) is the second connection area M3, and the surface area of ​​the surrounding plate (12) corresponding to the interval is the second surface area M4. The ratio between the second connection area M3 and the second surface area M4 is greater than or equal to 2% and less than or equal to 46%. The units of the second connection area M3 and the second surface area M4 are cm. 2 .

2. The battery pack according to claim 1, characterized in that, The projected area of ​​the buffer (40) on the outer side of the battery pack (20) is the projected area M5. The first surface area M2 and the projected area M5 satisfy 53% ≤ M5 / M2 ≤ 99.3%. The unit of the projected area M5 is cm. 2 .

3. The battery pack according to claim 2, characterized in that, The connecting colloid (30) has a through hole (31) that runs through the vertical direction, wherein 53% ≤ M5 / M2 ≤ 80%.

4. The battery pack according to claim 2, characterized in that, The buffer (40) is in contact with both the enclosure (12) and the battery pack (20), wherein 53% ≤ M5 / M2 ≤ 90%.

5. The battery pack according to claim 2, characterized in that, The battery pack (20) has a rectangular cross-section. The outer side of the short side of the rectangular structure is directly connected to the enclosure (12). The gap is formed between the outer side of the long side of the rectangular structure and the enclosure (12), wherein 65% ≤ M5 / M2 ≤ 99.3%; or, The interval is an annular interval formed on the outer periphery of the battery pack (20), wherein 53% ≤ M5 / M2 ≤ 90%.

6. The battery pack according to claim 2, characterized in that, The battery pack (20) comprises multiple cylindrical cells, wherein 53% ≤ M5 / M2 ≤ 78%; or, The battery pack (20) comprises multiple prismatic cells, wherein 65% ≤ M5 / M2 ≤ 99.3%.

7. The battery pack according to claim 2, characterized in that, The buffer (40) contacts the enclosure (12) and is spaced from the battery pack (20), wherein 63% ≤ M5 / M2 ≤ 99.3%; or, The buffer (40) is spaced apart from the enclosure (12) and in contact with the battery pack (20), wherein 63% ≤ M5 / M2 ≤ 99.3%.

8. The battery pack according to claim 1, 2, 5 or 6, characterized in that, The buffer (40) is in contact with both the enclosure (12) and the battery pack (20).

9. The battery pack according to any one of claims 1 to 7, characterized in that, The connecting colloid (30) includes a plurality of colloid blocks (32), and the buffer (40) includes a plurality of buffer blocks (41). The plurality of buffer blocks (41) and the colloid blocks (32) are alternately arranged in the lateral direction.

10. The battery pack according to claim 9, characterized in that, The vertical cross-sectional area of ​​the gel block (32) located at the middle of the outer side of the battery pack (20) in the lateral direction is greater than the vertical cross-sectional area of ​​the gel block (32) located at the end of the outer side of the battery pack (20) in the lateral direction.

11. The battery pack according to claim 9, characterized in that, In the direction from the outer side of the battery pack (20) to the enclosure (12), the width of the gel block (32) first decreases and then increases.

12. The battery pack according to any one of claims 1 to 7, characterized in that, The elastic modulus of the buffer (40) is greater than or equal to 0.01 MPa and less than or equal to 20 MPa.

13. The battery pack according to any one of claims 1 to 7, characterized in that, The buffer (40) is interference-fitted with both the enclosure (12) and the battery pack (20).

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