Bottom structure of battery pack, battery pack and electric equipment
Through the battery pack bottom structure made of integrated die-casting, combined with the groove structure and opening design, the existing battery pack bottom structure has solved the problems of low production efficiency, high cost and burr residue, achieving high strength, high temperature resistance and low cost effects.
Patent Information
- Application Number
- CN202323368727.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-07
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2033-12-07
AI Technical Summary
The bottom structure of the existing battery pack has problems such as low production efficiency, severe deformation, high cost, and high burr aluminum chip residue, which is difficult to clean.
The bottom structure is made of integrated die-casting, including a bottom frame and a support plate. The lower surface of the support plate has a groove structure to cooperate with the metal plate to form a channel. The side surface of the support plate has an opening to guide the flow of thermal runaway gas into the channel, and the passage is separated by the partitioning ribs to divert and drain the gas.
It has achieved the reduction of production costs and improved production efficiency, while improving the high temperature and high strength performance of the structure, and effectively solving the problem of burr aluminum chip residue.
Smart Images
Figure CN222619949U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery manufacturing, and in particular to a bottom structure of a battery pack and a battery pack comprising the bottom structure and an electrical device using the battery pack. Background Art
[0002] With the development of power battery systems, safety and cost have become the focus of people's attention. The bottom protective plate of the battery pack not only requires high temperature resistance and high strength, but also requires low cost and high production efficiency. The general bottom protective plate is directly made of metal plates; some bottom protective plates include a bottom frame welded from multiple sections of profiles to improve strength, forming an overall bottom structure. The profile is deformed greatly during welding, and the profile has a lot of aluminum chips and hair residues due to machining, which is not easy to clean. The profile needs to add additional fasteners to connect with other parts. Therefore, the current bottom structure of the battery pack has the disadvantages of low production efficiency, serious deformation, high cost, a lot of burrs and aluminum chips, and is not easy to clean. Utility Model Content
[0003] The utility model aims to solve the above technical problems, namely, the structural strength and cost problems of the bottom structure of the current battery pack.
[0004] To this end, in a first aspect, the utility model provides a bottom structure of a battery pack, the bottom structure comprising a first component formed by integral die-casting and a plate-shaped second component connected below the first component; wherein the first component comprises a bottom frame and a support plate, the support plate is used to support the battery cells in the battery pack and the two ends of the support plate are connected to the bottom frame; the lower surface of the support plate has a first groove, the first groove cooperates with the second component to define a first channel, the side of the support plate has a first opening, and the thermal runaway gas of the battery cells of the battery pack enters the first channel from the first opening.
[0005] In an optional technology of the present invention, the support plate includes a plurality of dividing ribs extending along the first channel.
[0006] In an optional technology of the present utility model, the lower surface of the bottom frame has a second groove, and the second groove cooperates with the second component to define a second channel. The bottom frame has a second opening at the connection with the support plate, so that the second channel is connected to the first channel.
[0007] In an optional technology of the present invention, the bottom structure further includes: a third component, and the third component is arranged between the bottom frame and the second component.
[0008] In an optional technology of the present invention, a sealant is provided between the bottom frame and the third component.
[0009] In the optional technology of the present utility model, the bottom frame also includes a first mounting hole and a second mounting hole; the first mounting hole is located on the lower surface of the bottom frame, and is used to connect the first component to the second component through a fastener; the second mounting hole is on the upper surface of the bottom frame, and is used to connect the side beam of the battery pack using a fastener.
[0010] In an optional technology of the present utility model, the first component further includes: connecting ribs arranged between adjacent support plates, and two ends of the connecting ribs are straddling the middle positions of the extension directions of the adjacent support plates.
[0011] In an optional technology of the present invention, the second component is a stamped metal plate.
[0012] The bottom structure of the battery pack provided in the embodiment of the present application, while achieving the required functions, is not only low-cost and fast to manufacture, but also has high temperature resistance and high strength performance.
[0013] In a second aspect, the utility model further provides a battery pack, comprising the bottom structure of any one of the above technical solutions.
[0014] In a third aspect, the utility model further provides an electrical device, comprising the above-mentioned battery pack. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 It is an overall schematic diagram of the bottom structure of the utility model;
[0016] Figure 2 It is a layered exploded schematic diagram of the bottom structure of the utility model;
[0017] Figure 3 It is a front view of the first component of the bottom structure of the utility model;
[0018] Figure 4 It is a back view of the first component of the bottom structure of the utility model;
[0019] Figure 5 The utility model Figure 4 A partial enlarged schematic diagram of
[0020] Figure 6 The utility model Figure 3 A schematic cross-sectional view of AA;
[0021] Figure 7 The utility model Figure 3 A schematic cross-sectional view of BB;
[0022] Figure 8It is a front view of the second component of the bottom structure of the utility model. DETAILED DESCRIPTION
[0023] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.
[0024] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0025] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.
[0026] In the description of the present invention, reference to terms such as "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some implementation methods" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention.
[0027] like Figure 1 and Figure 2 As shown, a bottom structure of a battery pack is divided into two parts: a first component 1 and a second component 2, and the second component 2 is connected to the bottom of the first component 1.
[0028] Among them, the first component 1 is made by die-casting; the second component 2 is plate-shaped and can be made by stamping metal plates or compression molding of composite materials. It should be noted here that due to the different structures of the battery pack body, the second component 2 can be a single bottom plate of the battery pack or the bottom surface part of the lower box shell of the battery pack. The utility model mainly involves the first component 1 and the second component 2 jointly constructing the chamber located between the two to serve as an exhaust channel. Therefore, the specific embodiment part does not describe other parts of the lower box shell when the second component 2 is the bottom surface part of the lower box shell of the battery pack.
[0029] And as Figure 3As shown, the first component 1 is divided into a bottom frame 11 and a support plate 12 according to different areas and main functions: the bottom frame 11 is mainly located in a circle around the outer periphery to form an overall outline; the support plate 12 is a flat structure connecting the bottom frames 11 on different sides in the horizontal direction, and the support plate 12 can support the battery cells in the battery pack.
[0030] Since the internal cavity of some bottom structural profiles in the prior art has the function of gas passage, a similar structure is constructed to realize this function. Figure 4 As shown, the support plate 12 has a first groove of a certain depth on its surface facing the second component 2 , i.e., the lower surface. The first groove on the first component 1 cooperates with the second component 2 to define a chamber similar to the interior of a profile, which is the first channel 122 .
[0031] like Figure 1 and Figure 5 As shown, the side of the support plate 12 has a first opening 123. The gas generated when the battery cell thermally runs away will erupt from the bottom of the battery cell, enter the gap between adjacent support plates 12, and then flow into the aforementioned chamber from the first opening 123. The gas will flow along the first channel 122 on the support plate 12, thereby achieving the function of guiding the thermal runaway gas.
[0032] The bottom structure of the utility model can realize the function of guiding exhaust by splicing existing profiles. At the same time, because the bottom wall sealing function of the gas channel is realized by the second component 2, the first component 1 only includes the top wall and two side walls of the gas channel, so that the die-casting mold structure of the first component 1 is simple, which greatly simplifies the manufacturing process, effectively reduces costs and improves production rates. At the same time, die-casting molding makes the bottom structure of the utility model have better strength and high temperature resistance.
[0033] like Figure 4 and Figure 5As shown, the first groove on the lower surface of the support plate 12 can be separated by a dividing rib 121. The dividing rib 121 extends along the first channel 122 to the end of the support plate 12, and divides the first channel 122 into a plurality of parallel airways for diverting and guiding the gas in thermal runaway. A plurality of first openings 123 can also be provided on the dividing rib 121, so that different airways can circulate with each other. Generally, the plurality of first openings 123 on the same support plate 12 can be located at the same position in the extension direction of the airway, which is conducive to the rapid entry of the gas into different first channels 122 and the rapid discharge of the gas. In addition, the plurality of first openings 123 can also be staggered in the extension direction of the airway, which can effectively extend the length of the gas flow path. Such a design is conducive to further cooling the thermal runaway gas. It can be understood that the positional relationship between the plurality of first openings 123 is related to the demand for the airway function, and those skilled in the art can combine and design according to the demand to balance the gas circulation rate and the gas cooling effect. As an optional scheme, in Figure 5 The illustration in FIG. 1 shows that the plurality of first openings 123 are located at the same position in the extending direction of the airway.
[0034] In such Figure 3 At the AA section shown in FIG. 1 , a second channel 111 is provided on the bottom frame 11. Figure 6 As shown, there is a second groove of a certain depth on the lower surface of the bottom frame 11, and because the bottom surface of the bottom frame 11 is connected to the second component 2, the second groove also cooperates with the second component 2 as a whole to form a closed chamber. By further arranging the inlet and outlet of the gas on the closed chamber, it plays the role of the second channel 111.
[0035] Further, if Figure 6 As shown, the bottom frame 11 has a second opening 112 at the connection with the support plate 12, and the second opening 112 is opposite to the first channel 122 on the support plate 12, so that the second channel 111 is connected with the first channel 122; at the same time, the upper surface of the bottom frame 11 has a third opening 113, and the third opening 113 is opposite to the exhaust channel entrance on other components of the battery pack.
[0036] With respect to the bottom structure in the above-mentioned specific embodiment of the utility model, when thermal runaway occurs, the thermal runaway gas of the battery pack flows from the end of the first channel 122 through the second opening 112 to the chamber of the bottom frame 11, and then flows from the third opening 113 of the bottom frame 11 into the gas flow channels of other components of the battery pack, and then is discharged to the outside of the battery pack to ensure the safety of the battery pack.
[0037] Specifically, the other components mentioned above are side beams of the battery pack. The side beams are also hollow tubular structures. Multiple side beams of the battery pack are interconnected, and at least one of the side beams is provided with an explosion-proof valve. When the gas enters the side beams through the first channel 122 and the second channel 111 in sequence, the gas flows in each side beam. When the gas pressure exceeds the threshold of the explosion-proof valve, the gas is discharged to the outside of the battery pack through the explosion-proof valve.
[0038] The first groove and the second groove structure on the above-mentioned first component 1 have been formed by die-casting at the same time as the first component 1 is integrally die-cast; in addition, the first opening 123, the second opening 112 and the third opening 113 have also been formed by a positive mold at the corresponding positions of the support plate 12 and the bottom frame 11 when the first component 1 is integrally die-cast, without the need for machining or other processes.
[0039] It should be noted that after the above-mentioned multiple structures are formed by integral die casting, they can be further machined to correct their dimensional errors and the flatness of the outer surface, but this cannot be considered that the structure is formed by machining. However, the production of the first component 1 and the above-mentioned structures by integral die casting greatly improves the production rate and reduces the production cost.
[0040] In addition, if Figure 2 , Figure 6 and Figure 7 As shown, the bottom structure also includes a third component 3, which is arranged between the bottom frame 11 and the second component 2, and only includes the second groove of the bottom frame 11 and the third component 3 to directly form the above-mentioned second channel 111. The shape of the third component 3 is a circle that only includes the outer periphery of the bottom frame 11. The main reason for the third component 3 is that the second component 2 is a plate-like structure, and its shape is difficult to fully match the bottom surface of the bottom frame 11 formed by die casting while matching the bottom surface of the support plate 12. By adding the third component 3 as an intermediate transition structure, the upper surface of the third component 3 is set to match the lower surface of the bottom frame 11, so that the bottom frame 11 and the first component 1 have good airtightness to ensure that the gas flowing through the second channel 111 does not leak outward at this place. The lower surface of the third component 3 should also be as flat as possible so that the second component 2 can be better installed and connected with the first component 1.
[0041] Furthermore, the third component 3 and the bottom frame 11 are sealed and connected via a sealant 4 to ensure better airtightness.
[0042] like Figure 7As shown, the bottom frame 11 also includes mounting holes, which are used to connect the second component 2 to other components respectively through fasteners. Specifically, the mounting holes are divided into a first mounting hole 114 and a second mounting hole 115. The first mounting hole 114 is on the lower surface of the bottom frame 11 and is used to connect the first component 1 to the second component 2 through fasteners; the second mounting hole 115 is on the upper surface of the bottom frame 11 and is used to connect the side beam of the battery pack body with fasteners. The fasteners can be bolts, rivets, etc.
[0043] Specifically, in Figure 3 At the BB cross section shown, the bottom frame 11 is not connected to the support plate 12, and the second channel 111 may not be set in this part. In this part, a blind hole of a certain depth is drilled in the bottom frame 11 by machining without penetrating the bottom frame 11 to form the first and second mounting holes 115. At the same time, the inside of the blind hole can be further machined to form a threaded structure on the inner wall of the blind hole for the installation of fasteners. In addition, for the convenience of machining, the first and second mounting holes 115 can be pre-formed at the corresponding position by integral die-casting before machining, and then formed by machining threads. The first and second mounting holes 115 can be as follows Figure 7 As shown, they are arranged relatively up and down at the same position, or they can be arranged at different positions and staggered with each other.
[0044] The first component 1 manufactured by the above-mentioned integral die-casting and subsequent partial machining has a better integrated structure and can better cooperate with the second component 2 to directly form the required function.
[0045] Generally, the third component 3 has a through hole at a position corresponding to the second mounting hole 115 , so as to allow a fastener for connection to penetrate and cooperate with the second mounting hole 115 .
[0046] like Figure 4 As shown, the first component 1 also includes: connecting ribs 13 between adjacent support plates 12, with both ends of the connecting ribs 13 straddling the middle position of the adjacent support plates 12 in the extension direction, which plays a role in stabilizing the structure of the first component 1.
[0047] In order to enhance the connection strength between the first component 1 and the second component 2 at the middle position, a mounting hole is also provided on the bottom surface of the connecting rib 13, which has the same function as the second mounting hole 115 of the bottom frame 11 and is used to connect the first component 1 to the second component 2 through fasteners.
[0048] Further, if Figure 8As shown, a recessed portion is provided at the place where the second component 2 is connected to the middle part. The recessed portion is a recessed portion on the bottom surface of the second component 2 facing the inside of the battery pack, and is used to accommodate the heads of fasteners such as bolts and rivets. Similarly, the second component 2 has a flange edge that sinks into the battery pack at the edge opposite to the bottom frame 11. The design of the recessed portion and the flange edge can ensure that the fastener does not protrude from the reference surface of the second component 2 after installation.
[0049] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.
Claims
1. A bottom structure of a battery pack, characterized in that: The bottom structure comprises a first component (1) formed by integral die-casting and a plate-shaped second component (2) connected below the first component (1); The first component (1) comprises a bottom frame (11) and a support plate (12), wherein the support plate (12) is used to support the battery cells in the battery pack and both ends of the support plate (12) are connected to the bottom frame (11); The lower surface of the support plate (12) has a first groove, and the first groove cooperates with the second component (2) to define a first channel (122). The side surface of the support plate (12) has a first opening (123), and the thermal runaway gas of the battery cell of the battery pack enters the first channel (122) from the first opening (123).
2. The bottom structure according to claim 1, characterized in that: The support plate (12) comprises a plurality of dividing ribs (121) extending along the first channel (122).
3. The bottom structure according to claim 1, characterized in that: The lower surface of the bottom frame (11) has a second groove, and the second groove cooperates with the second component (2) to define a second channel (111). The bottom frame (11) has a second opening (112) at the connection with the support plate (12), so that the second channel (111) is connected to the first channel (122).
4. The bottom structure according to claim 3, characterized in that: The bottom structure further comprises: a third component (3), wherein the third component (3) is arranged between the bottom frame (11) and the second component (2).
5. The bottom structure according to claim 4, characterized in that: A sealant (4) is provided between the bottom frame (11) and the third component (3).
6. The bottom structure according to claim 3, characterized in that: The bottom frame (11) further comprises a first mounting hole (114) and a second mounting hole (115); The first mounting hole (114) is located on the lower surface of the bottom frame (11) and is used to connect the first component (1) to the second component (2) via a fastener; the second mounting hole (115) is located on the upper surface of the bottom frame (11) and is used to connect the side beam of the battery pack via a fastener.
7. The bottom structure according to claim 1, characterized in that: The first component (1) further comprises: a connecting rib (13) arranged between adjacent support plates (12), wherein both ends of the connecting rib (13) are straddled at the middle position of the extension direction of the adjacent support plates (12).
8. The bottom structure according to any one of claims 1 to 7, characterized in that: The second component (2) is a stamped metal plate.
9. A battery pack, characterized in that: The invention comprises the bottom structure as described in any one of claims 1 to 8.
10. An electrical device, characterized in that: Comprising the battery pack as claimed in claim 9.