Lower shell and battery pack

Abstract

The utility model relates to the technical field of batteries, and provides a lower shell and a battery pack, the lower shell comprises a bottom plate, an edge beam and an anti-explosion valve; the edge beam is arranged on the peripheral side of the bottom plate in a surrounding mode to form a containing cavity used for containing a battery cell, the edge beam comprises a frame body, a first rib plate and a second rib plate, the frame body is provided with a hollow inner cavity, and the first rib plate and the second rib plate are arranged in the inner cavity in a spaced mode from top to bottom in the height direction of the frame body so that the inner cavity can be divided into a first cavity, a second cavity and a third cavity; the second cavity is communicated with the accommodating cavity to form an exhaust channel, and exhaust of the battery cell in the accommodating cavity is exhausted through the exhaust channel; the anti-explosion valve is installed on the outer side of the frame body and communicates with the exhaust channel. According to the utility model, the first rib plate is arranged to isolate metal scraps generated in the machining process of the mounting hole of the frame body, so that the metal scraps are prevented from entering the exhaust channel, the metal scraps cannot enter the battery pack through the exhaust channel, and the safety and the reliability of the battery pack are improved.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a lower casing and a battery pack. Background Technology

[0002] The power battery in new energy vehicles, serving as both an energy storage and power output device, is a core component of electric vehicles. The safety performance of the power battery significantly impacts the overall safety performance of the electric vehicle. In the design of the power battery, explosion-proof valves ensure the smooth discharge of internal gases while preventing the entry of external contaminants. However, during the manufacturing process, especially in the machining of the mounting holes in the lower casing, aluminum shavings are easily generated. These shavings may enter the battery pack through the venting channels, affecting battery performance and safety. Utility Model Content

[0003] This invention provides a lower housing and a battery pack to solve the problem in the prior art where the lower housing is unable to effectively prevent debris generated during the machining of the mounting holes of the lower housing from entering the battery through the exhaust channel of the explosion-proof valve, thereby affecting the battery performance.

[0004] To solve the above-mentioned technical problems, this application is implemented as follows:

[0005] In a first aspect, this utility model provides a lower housing, comprising:

[0006] Base plate;

[0007] A side beam is arranged around the periphery of the base plate to form a cavity for accommodating the battery cell. The side beam includes a frame, a first stiffener, and a second stiffener. The frame has a hollow inner cavity. Along the height direction of the frame from top to bottom, the first stiffener and the second stiffener are spaced apart in the inner cavity to isolate the inner cavity into a first cavity, a second cavity, and a third cavity. The second cavity is connected to the accommodating cavity to form an exhaust channel, through which the exhaust gas of the battery cell in the accommodating cavity is discharged.

[0008] An explosion-proof valve is installed on the outside of the frame and is connected to the exhaust channel.

[0009] According to the present invention, a lower housing has an air inlet on the inner side of the frame facing the receiving cavity, and the air inlet is located in the area where the second cavity is located.

[0010] According to the present invention, a lower housing is provided in which the second cavity and the third cavity are connected and the second cavity and the third cavity together form the exhaust channel.

[0011] According to the present invention, a lower housing is provided in which a connecting hole is provided on the second rib plate, and the connecting hole is arranged adjacent to the air inlet.

[0012] According to the present invention, a lower housing is provided with a machining hole on the inner side of the frame facing the receiving cavity. The machining hole is arranged opposite to the connecting hole, and the length direction of the machining hole extends along the length direction of the connecting hole.

[0013] According to the present invention, a lower housing is provided, wherein multiple air inlets are provided, and the multiple air inlets are respectively provided on the inner side of the frame, and multiple connecting holes are also provided, with the multiple air inlets and the multiple connecting holes being provided in a one-to-one correspondence.

[0014] According to the present invention, in a lower housing, the first stiffening plate and / or the second stiffening plate are aluminum plates.

[0015] According to the present invention, a lower housing is provided, wherein the frame is provided with cable tie holes, and the cable tie holes are symmetrically distributed on both sides of the second stiffener;

[0016] The cable tie hole is configured to be fitted with a sealing element, which is a flexible element and has a notch to facilitate the insertion of the cable tie.

[0017] According to the present invention, a lower housing is provided, wherein the notch is a cross notch, and the center of the cross notch is located at the center of the sealing member.

[0018] Secondly, this utility model provides a battery pack, including: an upper shell, a battery cell, and a lower shell as described above;

[0019] The battery cell is located inside the lower housing, and the upper housing is fixed to the opening end of the lower housing.

[0020] The lower housing and battery pack provided by this utility model, by setting a hollow frame in the side beam, and setting a first rib and a second rib at intervals in the frame, isolates the inner cavity of the frame into a first cavity, a second cavity and a third cavity, and connects the cell housing cavity with the second cavity to form an exhaust channel, so that the exhaust of the cell can be discharged from the explosion-proof valve through the exhaust channel. Since the first rib can isolate the metal debris generated during the processing of the mounting hole of the frame, it prevents the metal debris from entering the exhaust channel, so that the metal debris will not enter the cell through the exhaust channel, thereby improving the safety and reliability of the battery pack. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of the lower shell provided by this utility model.

[0023] Figure 2 This is a top view structural diagram of the side beam provided by this utility model.

[0024] Figure 3 This utility model provides Figure 2 AA sectional view.

[0025] Figure 4 This utility model provides Figure 3 Enlarged view of part K.

[0026] Figure 5 This is a right-side structural schematic diagram of the side beam provided by this utility model.

[0027] Figure 6 This utility model provides Figure 4 BB cross-sectional view.

[0028] Figure 7 This is a three-dimensional structural diagram of the side beam provided by this utility model.

[0029] Figure 8 This utility model provides Figure 7 Enlarged view of the L section.

[0030] Figure label:

[0031] 1. Base plate;

[0032] 2. Side beam; 21. Frame; 22. First stiffening slab; 23. Second stiffening slab; 24. First cavity; 25. Second cavity; 26. Third cavity;

[0033] 211. Air inlet; 212. Machining hole; 213. Cable tie hole; 231. Connecting hole;

[0034] 3. Receiving cavity. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0036] In the description of the embodiments of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of clarifying the embodiments of this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model according to the specific circumstances.

[0038] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0040] The following is combined Figures 1 to 8 The lower housing and battery pack provided by the present invention will be described in detail through specific embodiments and application scenarios.

[0041] Firstly, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a lower housing, including: a base plate 1, a side beam 2, and an explosion-proof valve.

[0042] Side beam 2 surrounds the periphery of the base plate 1 to form a receiving cavity 3 for accommodating the battery cell. Side beam 2 includes a frame 21, a first stiffener 22 and a second stiffener 23. The frame 21 has a hollow inner cavity. Along the height direction of the frame 21 from top to bottom, the first stiffener 22 and the second stiffener 23 are spaced apart in the inner cavity to isolate the inner cavity into a first cavity 24, a second cavity 25 and a third cavity 26. The second cavity 25 is connected to the receiving cavity 3 to form an exhaust channel, through which the exhaust of the battery cell in the receiving cavity 3 is discharged.

[0043] The explosion-proof valve is installed on the outside of the frame 21 and is connected to the exhaust channel.

[0044] Understandably, the base plate 1 is a square plate, and the side beams 2 are square frame structures, surrounding the four sides of the base plate 1. The side beams 2 and the base plate 1 form a square receiving cavity 3, which is used to place the battery cells.

[0045] The frame 21 is a hollow frame composed of four segments surrounding the base plate 1, with each segment having a connected internal cavity. A first stiffening plate 22 and a second stiffening plate 23 are horizontally positioned within the internal cavities, dividing the cavities into a first cavity 24 at the top of the frame 21, a third cavity 26 at the bottom of the frame 21, and a second cavity 25 in the middle of the frame 21. The second cavity 25 is connected to the receiving cavity 3, allowing the battery cells in the receiving cavity 3 to vent into the second cavity 25, thus forming an venting channel. An explosion-proof valve is connected to the venting channel, allowing the vented energy from the second cavity 25 to be discharged through the explosion-proof valve.

[0046] Specifically, the second cavity 25 and the receiving cavity 3 can be connected by a connecting pipe, or they can be connected by a through hole opened on the connecting plate of the second cavity 25 and the receiving cavity 3.

[0047] In practical applications, when the pressure inside the battery cell rises due to thermal runaway, overcharging, or short circuit, the vented gas from the battery cell is discharged through the venting channel from the explosion-proof valve, quickly releasing the gas and pressure inside the battery cell and preventing the lower casing from rupturing or exploding.

[0048] The first stiffener 22 and the second stiffener 23 enhance the structural strength of the frame 21, making the frame 21 more stable. Furthermore, since the first stiffener 22 is closer to the top of the frame 21, after the frame 21 is installed with the base plate 1, the mounting holes on the frame 21 need to be machined as a whole after assembly to avoid installation errors. During the drilling process, metal debris generated in the mounting holes falls onto the upper surface of the first stiffener 22 and is prevented from entering the venting channel by the stopping action of the first stiffener 22, thus ensuring the cleanliness of the venting channel and preventing metal debris from entering the battery cell and affecting its performance.

[0049] The lower housing provided by this utility model, by setting a hollow frame 21 in the side beam 2, and setting a first stiffener 22 and a second stiffener 23 at intervals in the frame 21, isolates the inner cavity of the frame 21 into a first cavity 24, a second cavity 25 and a third cavity 26, and connects the cell housing 3 with the second cavity 25 to form an exhaust channel, so that the exhaust of the cell can be discharged from the explosion-proof valve through the exhaust channel. Since the first stiffener 22 can isolate the metal debris generated during the processing of the mounting hole of the frame 21, it prevents the metal debris from entering the exhaust channel, so that the metal debris will not enter the cell through the exhaust channel, thereby improving the safety and reliability of the battery pack.

[0050] like Figure 7 and Figure 8 As shown, the frame 21 of this embodiment has an air inlet 211 on the inner side facing the receiving cavity 3, and the air inlet 211 is located in the area where the second cavity 25 is located.

[0051] Understandably, the frame 21 has an air inlet 211 on the side facing the receiving cavity 3, which is used to allow the battery cell exhaust in the receiving cavity 3 to enter the exhaust channel. Since the second cavity 25 in this embodiment forms the exhaust channel, the air inlet 211 is opened on the side wall of the corresponding area of ​​the second cavity 25, that is, the battery cell exhaust only enters the second cavity 25 through the air inlet 211.

[0052] Specifically, the air inlet 211 is a strip-shaped hole, which extends horizontally. The two ends of the strip-shaped hole are rounded to prevent the airflow from bending rapidly when the battery cell exhausts through the strip-shaped hole, thus ensuring a stable airflow.

[0053] like Figure 2 , Figure 3 and Figure 4 As shown, in this embodiment, the second cavity 25 and the third cavity 26 are connected and together form an exhaust channel.

[0054] Understandably, in order to increase the volume of the exhaust channel, this embodiment connects the second cavity 25 and the third cavity 26, so that the second cavity 25 and the third cavity 26 together form an exhaust channel, making the exhaust of the battery cell smoother. The exhaust of the battery cell enters the second cavity 25 through the air inlet 211, and enters the third cavity 26 through the connection between the second cavity 25 and the third cavity 26. The exhaust flows within the second cavity 25 and the third cavity 26 until it flows into the explosion-proof valve.

[0055] like Figure 7 and Figure 8 As shown, the second stiffener 23 in this embodiment is provided with a connecting hole 231, which is arranged adjacent to the air inlet 211.

[0056] Understandably, the connecting hole 231 is formed on the second stiffener 23, allowing the second cavity 25 and the third cavity 26 to be connected through the connecting hole 231. Since the connecting hole 231 and the air inlet 211 are in adjacent positions, the battery cell exhaust enters the second cavity 25 through the air inlet 211, and some exhaust enters the third cavity 26 through the adjacent connecting hole 231. The battery cell exhaust flows simultaneously in the second cavity 25 and the third cavity 26, flowing towards the area of ​​the explosion-proof valve.

[0057] Specifically, the width of the connecting hole 231 is the same as the width of the second stiffener 23, so as to achieve maximum connection between the second cavity 25 and the third cavity 26.

[0058] In this embodiment, by arranging the connecting hole 231 and the air inlet 211 adjacently, the battery cell exhaust entering the second cavity 25 is diverted by the connecting hole 231 through a shorter path. The battery cell exhaust can flow in the second cavity 25 and the third cavity 26, which is conducive to the rapid discharge of battery cell exhaust and to achieve smooth exhaust.

[0059] like Figure 7 and Figure 8 As shown, in this embodiment, the frame 21 is provided with a machining hole 212 on the inner side facing the receiving cavity 3. The machining hole 212 is arranged opposite to the connecting hole 231, and the length direction of the machining hole 212 extends along the length direction of the connecting hole 231.

[0060] Understandably, when the frame 21 is formed by extruding profiles, it is necessary to first open a machining hole 212 in the inner wall of the frame 21 before opening the connecting hole 231 in the second stiffener 23. The second stiffener 23 in the inner cavity is then machined through the machining hole 212 to open the connecting hole 231.

[0061] Specifically, the machining hole 212 and the connecting hole 231 extend in the same direction and have the same width, which makes it easier to machine the connecting hole 231 through the machining hole 212.

[0062] After machining the connecting hole 231, use tape to seal the machining hole 212 to prevent metal debris from entering the exhaust channel through the machining hole 212.

[0063] like Figure 5 and Figure 6 As shown, this embodiment has multiple air inlets 211, which are located on the inner side of the frame 21. Multiple connecting holes 231 are also provided, and the multiple air inlets 211 and the multiple connecting holes 231 are arranged in a one-to-one correspondence.

[0064] Understandably, this embodiment has multiple air inlets 211, which can accommodate the battery cell exhaust from multiple locations, making the battery cell exhaust flow into the exhaust channel more smoothly. Furthermore, multiple connecting holes 231 are located adjacent to the corresponding air inlets 211, allowing the battery cell exhaust entering the exhaust channel to quickly split into two streams, flowing from the second cavity 25 and the third cavity 26 respectively, ensuring the smooth discharge of the battery cell exhaust.

[0065] like Figure 4 As shown, the first stiffener 22 and / or the second stiffener 23 in this embodiment are aluminum plates.

[0066] Understandably, aluminum plates have a low density, good heat dissipation performance, and are lightweight. The first stiffener 22 and the second stiffener 23 are made of aluminum plates, which can reduce the weight of the frame 21 and optimize thermal management.

[0067] like Figure 7 and Figure 8 As shown, the frame 21 of this embodiment is provided with cable tie holes 213, which are symmetrically distributed on both sides of the second stiffener 23;

[0068] The cable tie hole 213 is configured to be fitted with a sealing element, which is a flexible element and has a notch to facilitate the insertion of the cable tie.

[0069] Understandably, the cable tie hole 213 is used for cable ties to pass through during assembly. Since metal shavings can enter the exhaust channel through the cable tie hole 213, this embodiment installs a sealing element to seal the cable tie hole 213, preventing metal shavings from leaking into the exhaust channel. Furthermore, the sealing element is a flexible component with a notch. When passing the cable tie through the cable tie hole 213, it is not necessary to remove the sealing element; the cable tie can be directly pressed into the notch and passed through, completing the installation of the cable tie into the cable tie hole 213. The notch design in this embodiment saves the step of removing the sealing element when installing the cable tie, reducing assembly time and improving assembly efficiency.

[0070] Specifically, the sealing component can be tape.

[0071] Optionally, the notch in this embodiment is a cross-shaped notch, with the center of the cross-shaped notch located at the center of the sealing component.

[0072] Understandably, the large opening area of ​​the cross notch allows for precise guidance of the cable tie through the predetermined path. Furthermore, since the cross notch divides the sealing component into four parts, each of the four parts can be separated during the cable tie installation process, increasing the cable tie's passage area and making the installation of the cable tie more convenient.

[0073] Secondly, such as Figure 1 As shown, this embodiment provides a battery pack, including: an upper shell, a battery cell, and a lower shell; the battery cell is located inside the lower shell, and the upper shell is fixed to the opening end of the lower shell.

[0074] Specifically, since the battery pack includes a lower housing, and the specific structure of the lower housing is as described in the above embodiments, the battery pack shown in this embodiment includes all the technical solutions of the above embodiments. Therefore, it has at least all the beneficial effects achieved by all the technical solutions of the above embodiments, which will not be described in detail here.

[0075] Understandably, the lower housing encloses and forms a receiving cavity 3 to accommodate the battery cell. The upper housing is installed at the open end of the receiving cavity 3, and the lower housing and the upper housing together encapsulate the battery cell within the receiving cavity 3.

[0076] In this embodiment, the lower housing has a first stiffener 22 and a second stiffener 23 on the frame 21, dividing the inner cavity of the frame 21 into a first cavity 24, a second cavity 25, and a third cavity 26. This allows the first stiffener 22 to block metal debris generated during the machining of the mounting holes in the frame 21, preventing metal debris from entering the exhaust channel. Furthermore, the battery cell exhaust can be smoothly discharged through the second cavity 25 and the third cavity 26. Through cavity partitioning and flow channel optimization, reasonable control of metal debris in the mounting holes is achieved, preventing metal debris from mixing into the exhaust channel.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A lower housing, characterized in that, include: Base plate; A side beam is arranged around the periphery of the base plate to form a cavity for accommodating the battery cell. The side beam includes a frame, a first stiffener, and a second stiffener. The frame has a hollow inner cavity. Along the height direction of the frame from top to bottom, the first stiffener and the second stiffener are spaced apart in the inner cavity to isolate the inner cavity into a first cavity, a second cavity, and a third cavity. The second cavity is connected to the accommodating cavity to form an exhaust channel, through which the exhaust gas from the battery cell in the accommodating cavity is discharged. An explosion-proof valve is installed on the outside of the frame and is connected to the exhaust channel.

2. The lower housing according to claim 1, characterized in that, The frame has an air inlet on the inner side facing the receiving cavity, and the air inlet is located in the area where the second cavity is located.

3. The lower housing according to claim 2, characterized in that, The second cavity and the third cavity are connected and together form the exhaust channel.

4. The lower housing according to claim 3, characterized in that, The second rib is provided with a connecting hole, which is arranged adjacent to the air inlet.

5. The lower housing according to claim 4, characterized in that, The frame has a machining hole on the inner side facing the receiving cavity. The machining hole is positioned opposite to the connecting hole, and the length direction of the machining hole extends along the length direction of the connecting hole.

6. The lower housing according to claim 4, characterized in that, The frame has multiple air inlets, which are located on the inner side of the frame. It also has multiple connecting holes, with each air inlet and connecting hole corresponding to the other.

7. The lower housing according to claim 1, characterized in that, The first stiffener and / or the second stiffener are aluminum plates.

8. The lower housing according to claim 1, characterized in that, The frame is provided with cable tie holes, which are symmetrically distributed on both sides of the second stiffener. The cable tie hole is configured to be fitted with a sealing element, which is a flexible element and has a notch to facilitate the insertion of the cable tie.

9. The lower housing according to claim 8, characterized in that, The notch is a cross-shaped notch, and the center of the cross-shaped notch is located at the center of the sealing component.

10. A battery pack, characterized in that, include: The upper housing, the battery cell, and the lower housing as described in any one of claims 1 to 9; The battery cell is located inside the lower housing, and the upper housing is fixed to the opening end of the lower housing.

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