Battery case and battery pack

Abstract

Provided in the present application are a battery case and a battery pack. The battery case comprises: an upper cover; a case body, wherein the case body and the upper cover form, in an enclosing manner, an accommodating space that is configured to accommodate a battery module; and a downward-pressing frame, which is connected to the case body, and at least partially abuts against the top of the battery module, so as to press the battery module in a direction towards the bottom of the case body.

Description

Battery box and battery pack

[0001] The present application claims priority to the Chinese patent application No. 2024221850575, filed on September 5, 2024, with the Chinese Patent Office, the whole content of which is incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery box and a battery pack. BACKGROUND

[0003] In the related art, the vertical direction constraint of the battery is generally achieved by reserving an opening in the bottom blue film of the battery pack, connecting the bottom aluminum shell of the battery cell and the tray box by glue, or directly connecting the bottom blue film of the battery pack to the tray box by glue. TECHNICAL PROBLEM

[0004] The above methods have the following disadvantages: the battery pack film process is more complex, and the uniformity of the glue thickness is poor, which requires additional glue thickness control measures, increasing the manufacturing cost; the interface formed by the battery-blue film-glue-tray box has poor vertical constraint ability, which cannot meet the requirements of complex and severe working conditions.

[0005] As can be seen from the above, the related art has the problem of poor vertical direction constraint effect of the battery pack. TECHNICAL SOLUTION

[0006] In a first aspect, the present application provides a battery box, comprising: an upper cover; a box body, the box body and the upper cover enclosing a containing space configured to contain a battery module; and a lower pressing frame connected with the box body, at least a portion of the lower pressing frame abutting against a top of the battery module to press the battery module in a direction towards a bottom of the box body.

[0007] In a second aspect, the present application provides a battery pack, comprising a battery module and the above-mentioned battery box, the battery module being contained in the battery box. ADVANTAGEOUS EFFECTS

[0008] Beneficial effects of the present application: by applying the technical solution of the present application, the battery box body includes an upper cover, a box body and a pressing frame, the box body and the upper cover enclose a containing space configured to contain a battery module, the pressing frame is connected with the box body, at least a part of the pressing frame abuts against the top of the battery module to extrude the battery module in a direction towards the bottom of the box body, thus by arranging the pressing frame to abut against the battery module, the force transmission path of the vertical direction constraint of the battery pack is increased, so as to bear a certain proportion of vertical stress, realize the effective vertical constraint of the battery pack in the battery box, in addition, under the pressing action of the pressing frame, the thickness of the structural adhesive layer between the battery module and the box body can maintain good consistency, ensure the consistency of the battery pack temperature, and then ensure the normal use of the battery pack, solve the poor vertical constraint effect of the battery pack in the related art. BRIEF DESCRIPTION OF DRAWINGS

[0009] FIG. 1 shows a structural schematic diagram of a battery box body in an embodiment of the present application;

[0010] FIG. 2 shows an exploded view of a battery pack in an embodiment of the present application;

[0011] FIG. 3 shows a structural schematic diagram of a pressing frame in an embodiment of the present application;

[0012] FIG. 4 shows a structural schematic diagram of the battery box body in an embodiment of the present application, with one angle of the upper cover hidden;

[0013] FIG. 5 shows a structural schematic diagram of the battery box body in an embodiment of the present application, with another angle of the upper cover hidden;

[0014] FIG. 6 shows a sectional view at A-A in FIG. 5;

[0015] FIG. 7 shows a sectional view at B-B in FIG. 5;

[0016] FIG. 8 shows a structural schematic diagram of a power consumption device in an embodiment of the present application.

[0017] Among them, the above drawings include the following reference signs:

[0018] 10, upper cover; 20, box body; 30, pressing frame; 31, edge connecting part; 32, middle limiting part; 321, frame; 322, first pressing strip; 323, second pressing strip; 40, battery module; 41, battery cell group; 411, battery cell; 4111, pole; 50, structural adhesive layer; 100, battery pack; 1000, power consumption device.

[0019] Embodiments of the present application

[0020] As shown in FIGS. 1-2, 4, and 6-7, the battery box body includes an upper cover 10, a box body 20, and a lower pressing frame 30. The box body 20 and the upper cover 10 enclose a receiving space configured to receive the battery module 40. The lower pressing frame 30 is connected with the box body 20, and at least a portion of the lower pressing frame 30 abuts against the top of the battery module 40 to press the battery module 40 in a direction towards the bottom of the box body.

[0021] By configuring the battery box body to include the upper cover 10, the box body 20, and the lower pressing frame 30, the box body 20 and the upper cover 10 enclose a receiving space configured to receive the battery module 40, and the lower pressing frame 30 is connected with the box body 20, and at least a portion of the lower pressing frame 30 abuts against the top of the battery module 40 to press the battery module 40 in a direction towards the bottom of the box body 20. In this way, by abutting the lower pressing frame 30 against the battery module 40, the force transmission path of the vertical constraint of the battery pack is increased, so as to be able to bear a certain proportion of vertical stress, and the effective vertical constraint of the battery pack in the battery box body is realized. In addition, under the pressing action of the lower pressing frame 30, the thickness of the structural adhesive layer 50 between the battery module 40 and the box body 20 can be kept in good consistency, so as to ensure the consistency of the battery pack temperature, and further ensure the normal use of the battery pack.

[0022] As shown in FIG. 3, the lower pressing frame 30 includes an edge connecting portion 31 and an intermediate limiting portion 32. The edge connecting portion 31 is connected with the box body 20. The intermediate limiting portion 32 has an avoiding notch for avoiding the battery module 40, and the intermediate limiting portion 32 abuts against the top of the battery module 40. It can be understood that the top of each cell 411 of the battery module 40 has a pole 4111, and the pole 4111 needs to be electrically connected with a connecting sheet to supply power to external equipment. Therefore, while abutting against the battery module 40 and pressing the battery module 40 downward, the lower pressing frame 30 needs to avoid the pole 4111.

[0023] As shown in FIGS. 3-7, the intermediate limiting portion 32 includes a frame 321, and the frame 321 encloses the avoiding notch and abuts against the top of the battery module 40.

[0024] In this embodiment, the frame 321 protrudes from the edge connecting portion 31 and forms a receiving groove, which communicates with the clearance notch. At least a portion of the battery module 40 is received in the receiving groove. That is, in this embodiment, the pressing frame 30 covers the battery module 40, allowing the pressing frame 30 to better abut against and press down on the battery module 40. The frame 321 protrudes from the edge connecting portion 31 to form four opposing sidewalls, surrounding the upper part of the battery module 40. Furthermore, the top of the frame 321 has a limiting perimeter extending inward in the circumferential direction, which abuts against the top of the battery module 40. By setting a limiting perimeter, the frame 321 can abut against the battery module 40 in the circumferential direction, thereby uniformly pressing the battery module 40 downward in the vertical direction, ensuring uniform transmission of vertical force, preventing deviation of the pressing force, and ensuring that the thickness of the structural adhesive layer 50 between the battery module 40 and the housing body 20 can maintain good consistency, thus ensuring the consistency of the battery pack temperature.

[0025] Understandably, the perimeter of the limit switch forms an avoidance gap, and the area of ​​the avoidance gap is smaller than the top surface area of ​​the battery module 40.

[0026] In this embodiment, the edge connecting portion 31 is U-shaped, and the bottom of the frame 321 is connected to the inner periphery of the edge connecting portion 31. Correspondingly, the top opening of the box body 20 also has a U-shaped connecting periphery, thereby connecting with the edge connecting portion 31. Specifically, the edge connecting portion 31 and the box body 20 are welded or bonded. Of course, other connection and fixing methods can also be used between the edge connecting portion 31 and the box body 20, which can be selected according to actual needs.

[0027] In this embodiment, the frame 321 is welded to the edge connecting portion 31. Furthermore, the frame 321 and the edge connecting portion 31 can also be integrally formed, thereby improving structural strength.

[0028] As shown in FIGS. 3-7, the intermediate limiting portion 32 further comprises a first pressing strip 322. The first pressing strip 322 extends along a first direction and is connected to opposite side frames 321 at both ends, and the first direction is the arrangement direction of the battery cells 411 in the cell group 41 of the battery module 40. That is, the extension direction of the first pressing strip 322 is the same as the arrangement direction of the battery cells 411 in the cell group 41. There is at least one first pressing strip 322, and each first pressing strip 322 is located between two adjacent cell groups 41 of the battery module 40. Specifically, each first pressing strip 322 corresponds to the pole 4111 of the two adjacent cell groups 41 of the battery module 40 in the horizontal direction. By arranging the first pressing strip 322, the intermediate limiting portion 32 can abut the inner side position of the top of the battery module 40, thereby more fully and uniformly pressing the battery module 40 downward, ensuring uniform transmission of the vertical force, preventing deviation of the pressing force, and enabling the thickness of the structural adhesive layer 50 to maintain good consistency, thereby ensuring the consistency of the battery pack temperature.

[0029] Further, when there are multiple first pressing strips 322, the multiple first pressing strips 322 are arranged at intervals along the second direction, thereby improving the uniformity of the pressing effect.

[0030] Specifically, as shown in FIG. 4, the battery module 40 in the embodiment comprises three cell groups 41, and accordingly, there are two first pressing strips 322, which are respectively located between the first cell group and the second cell group and between the second cell group and the third cell group. The limiting circumferential edge comprises four segments located on the long opposite sides and the short opposite sides of the side frame 321, and the two first pressing strips 322 are respectively connected to the limiting circumferential edge of the long opposite sides of the side frame 321. In fact, the limiting circumferential edge located on the short opposite side of the side frame 321 has the same effect as the first pressing strip 322 and can also be regarded as the first pressing strip 322.

[0031] In the embodiment, the width of the first pressing strip 322 is greater than the distance between the two adjacent cell groups 41 of the battery module 40, so that each first pressing strip 322 abuts the end of the two adjacent cell groups 41 of the battery module 40, as shown in FIG. 7. Further, the area of the abutment of each first pressing strip 322 with the end of the two adjacent cell groups 41 of the battery module 40 is the same, that is, each first pressing strip 322 is located at the middle position of the two adjacent cell groups 41 of the battery module 40. Through the above arrangement, each cell group 41 and its battery cell 411 can be pressed by the pressing frame 30, ensuring uniform transmission of the vertical force, preventing deviation of the pressing force, enabling the thickness of the structural adhesive layer 50 to maintain good consistency, and ensuring the consistency of the battery pack temperature.

[0032] In the embodiment, as shown in FIGS. 3-7, the intermediate limiting portion 32 further comprises second pressing strips 323. The second pressing strips 323 extend in the second direction and are connected to the frame 321 and the first pressing strips 322 or adjacent first pressing strips 322 at both ends, respectively. There are multiple second pressing strips 323, each of which is located between adjacent two battery cells 411 of each battery cell group 41. Specifically, each second pressing strip 323 corresponds to the pole columns 4111 of adjacent two battery cells 411 of each battery cell group 41 in the horizontal direction.

[0033] Further, the first pressing strips 322 and the second pressing strips 323 are both lower than the top surface of the pole columns 4111 in the vertical direction, so as to avoid interference with the electrical connection of the pole columns 4111.

[0034] In the embodiment, the second direction is perpendicular to the first direction. Specifically, as shown in FIG. 4, the X direction is the first direction, and the Y direction is the second direction.

[0035] Specifically, corresponding to the three battery cell groups 41, the embodiment comprises three groups of second pressing strips 323. Further, each battery cell group 41 in the embodiment comprises ten battery cells 411, and each group of second pressing strips 323 comprises nine second pressing strips 323, each of which is located between adjacent two battery cells 411 of each battery cell group 41. In fact, the limiting circumferences located at the opposite sides of the long side of the frame 321 have the same effect as the second pressing strips 323, and can also be regarded as second pressing strips 323.

[0036] In the embodiment, the width of the second pressing strips 323 is greater than the distance between adjacent two battery cells 411 of each battery cell group 41, so that each second pressing strip 323 abuts against the side edge of adjacent two battery cells 411 of each battery cell group 41, as shown in FIG. 6. Further, the area of abutment of each second pressing strip 323 with adjacent two battery cells 411 of each battery cell group 41 is the same, i.e., each second pressing strip 323 is located at the middle position of adjacent two battery cells 411 of each battery cell group 41. Through the above arrangement, each battery cell group 41 and its battery cells 411 can be pressed by the pressing frame 30, ensuring uniform transmission of the vertical force, preventing deviation of the extrusion force, and keeping the thickness of the structural adhesive layer 50 consistent, thereby ensuring the consistency of the battery pack temperature.

[0037] It can be understood that the first pressing strip 322 and the second pressing strip 323 in the embodiment are arranged in a cross manner to form a grid structure, and each grid corresponds to one battery cell 411. For one battery cell 411, the two ends thereof are pressed by the limiting circumferences of the short opposite sides of the first pressing strip 322 or the frame 321, and the two side edges thereof are pressed by the limiting circumferences of the long opposite sides of the second pressing strip 323 or the frame 321. That is, the top circumferences of each battery cell 411 are pressed by the pressing frame 30. Through the above arrangement, uniform transmission of the vertical force can be ensured, and deviation of the extrusion force is prevented, so that the thickness of the structural adhesive layer 50 can be kept in good consistency, and the consistency of the battery pack temperature is ensured.

[0038] In the embodiment, the first pressing strip 322 and the second pressing strip 323 are welded to the frame 321 and to each other. Further, the first pressing strip 322 and the second pressing strip 323 can be integrally formed with the frame 321, that is, the entire intermediate limiting portion 32 is an integrally formed member, so as to improve the structural strength. Through the above integrally formed manner, the grid structure can be directly machined corresponding to each battery cell 411, which is convenient and fast.

[0039] In the embodiment, the ratio between the height of the pressing frame 30 and the height of the battery module 40 is less than or equal to 90%. It can be understood that the height of the battery module 40 is matched with the overall height of the pressing frame 30 and the box body 20. When the height of the pressing frame 30 is large, the height of the box body 20 can be correspondingly reduced. Of course, the pressing frame 30 cannot replace the box body 20. In order to ensure the connection firmness of the pressing frame 30 and the box body 20 and the overall structural strength, the height of the box body 20 cannot be too small, that is, the height of the pressing frame 30 cannot be too large, so the ratio between the height of the pressing frame 30 and the height of the battery module 40 needs to be less than or equal to 90%.

[0040] In an optional embodiment, the frame 321 and the edge connecting portion 31 are integrally formed as a flat plate. That is, the frame 321 in this embodiment is not protruding from the edge connecting portion 31, that is, the pressing frame 30 is a flat plate structure. The avoiding gap or the grid structure can be directly provided at the middle position of the pressing frame 30, so that the pressing frame 30 is laid on the battery module 40 and abuts against the top of the battery module 40. The pressing frame 30 in this embodiment has a simple structure, which can reduce the material and save the manufacturing cost.

[0041] As shown in FIG. 2, the application further provides a battery pack, which comprises a battery module 40 and the above-mentioned battery box, and the battery module 40 is accommodated in the battery box.

[0042] As shown in FIGS. 2, 6-7, the battery pack further comprises a structural adhesive layer 50, which is arranged between the battery module 40 and the inner bottom surface of the box body 20, and is arranged to adhere and fix the battery module 40. By using the battery box in the embodiment, under the pressing action of the pressing frame 30, the thickness of the structural adhesive layer 50 between the battery module 40 and the box body 20 can be kept in good consistency, which ensures the consistency of the temperature of the battery pack, and further ensures the normal use of the battery pack.

[0043] As shown in FIG. 8, the application further provides a power consumption device 1000 comprising the battery pack 100 described above. The battery pack 100 described in the embodiments of the application is suitable for various power consumption devices 1000 using the battery pack 100. Specifically, the power consumption device 1000 can be a mobile phone, a portable device, a notebook computer, a vehicle, a ship, a spacecraft, an electric toy, an electric tool, etc. The embodiments of the application do not specially limit the power consumption device 1000 described above.

[0044] From the above description, it can be seen that the embodiments described above of the application achieve the following technical effects: by arranging the battery box to comprise the upper cover 10, the box body 20 and the pressing frame 30, the box body 20 and the upper cover 10 enclose a containing space arranged to contain the battery module 40, the pressing frame 30 is connected with the box body 20, and at least a part of the pressing frame 30 abuts against the top of the battery module 40 to press the battery module 40 in the direction towards the bottom of the box body 20, so that by abutting the pressing frame 30 against the battery module 40, the transmission path of the vertical constraint of the battery pack is increased, so as to be able to bear a certain proportion of vertical stress, and effectively constrain the battery pack in the vertical direction in the battery box. In addition, under the pressing action of the pressing frame 30, the thickness of the structural adhesive layer 50 between the battery module 40 and the box body 20 can be kept in good consistency, which ensures the consistency of the temperature of the battery pack, and further ensures the normal use of the battery pack.

Claims

1. A battery box, comprising: a top cover (10) ; a box body (20), the box body (20) and the top cover (10) enclosing a receiving space configured to receive a battery module (40) ; a pressing frame (30) connected with the box body (20), at least a portion of the pressing frame (30) abutting against a top of the battery module (40) to press the battery module (40) in a direction towards a bottom of the box body (20).

2. The battery pack of claim 1, wherein, The pressing frame (30) comprises: an edge connecting portion (31) connected with the box body (20) ; an intermediate limiting portion (32) having a clearance gap for avoiding the battery module (40), and the intermediate limiting portion (32) abutting against the top of the battery module (40).

3. The battery pack of claim 2, wherein, The intermediate limiting portion (32) comprises a frame (321) enclosing the clearance gap and abutting against the top of the battery module (40), and a first pressing strip (322) extending in a first direction and connected with the frame (321) on opposite sides, the first direction being a direction of arrangement of a cell group (41) of the battery module (40), and the first pressing strip (322) is at least one, each first pressing strip (322) being located between two adjacent cell groups (41) of the battery module (40).

4. The battery pack of claim 3, wherein, A width of the first pressing strip (322) is greater than a distance between the two adjacent cell groups (41) of the battery module (40), so that each first pressing strip (322) abuts against an end of the two adjacent cell groups (41) of the battery module (40), respectively.

5. The battery pack of claim 3, wherein, The intermediate limiting portion (32) further comprises a second pressing strip (323) extending in a second direction and connected with the frame (321) and the first pressing strip (322) or two adjacent first pressing strips (322) on opposite sides, the second pressing strip (323) being a plurality of, each second pressing strip (323) being located between two adjacent cells (411) of each cell group (41), and the second direction being perpendicular to the first direction.

6. The battery pack of claim 5, wherein, A width of the second pressing strip (323) is greater than a distance between the two adjacent cells (411) of the cell group (41), so that each second pressing strip (323) abuts against a side of the two adjacent cells (411) of the cell group (41), respectively.

7. The battery pack of claim 3, wherein, The frame (321) protrudes from the edge connecting portion (31) and encloses a receiving groove, the receiving groove being in communication with the clearance gap, at least a portion of the battery module (40) being received in the receiving groove, and a top of the frame (321) having a limiting circumferential edge extending inwardly in a circumferential direction, the limiting circumferential edge abutting against the top of the battery module (40).

8. The battery pack of claim 7, wherein, A ratio between a height of the pressing frame (30) and a height of the battery module (40) is less than or equal to 90%.

9. The battery pack of claim 3, wherein, The frame (321) and the edge connecting portion (31) are integrally formed as a flat plate.

10. A battery pack comprising a battery module (40) and the battery case according to any one of claims 1 to 9, the battery module (40) being housed in the battery case.

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