Battery box and battery

Abstract

The utility model relates to the field of batteries, and provides a battery box and a battery, the battery box comprises a box body, a cavity capable of accommodating a plurality of battery monomers is formed in the box body, a plurality of pressure discharge holes are formed in the inner wall of the bottom of the box body, and the plurality of pressure discharge holes and exhaust valves on the plurality of battery monomers are arranged in a one-to-one correspondence manner; the pressure discharging hole penetrates from the inner wall of the bottom of the box body to the outer wall of the bottom of the box body. And the abnormal battery monomer exhausts the gas in the shell of the abnormal battery monomer out of the box body through the exhaust valve of the abnormal battery monomer and the pressure exhaust hole corresponding to the exhaust valve. The battery box is short in pressure discharging path and high in efficiency, high-temperature and high-pressure gas generated by abnormal single batteries can be discharged in time, and the safety performance of the batteries is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery box and a battery. Background Art

[0002] The battery pack is the "heart" of electric vehicles and provides electric energy for them. The battery cells in the battery pack cannot be 100% safe and there is a risk of fire and explosion. Therefore, explosion-proof valves are usually installed on the battery cells. When an abnormality occurs in the battery cell, the battery cell can release pressure through its own explosion-proof valve and exhaust gas to the battery pack box. If the gas is not discharged in time, the accumulation of a large amount of gas in the battery pack will form a pressure difference between the inside and outside, which will cause the battery pack to explode, thus causing a safety accident.

[0003] In the related technology, the solution is to install one or more pressure balance valves on the battery pack. When the temperature and pressure in the battery pack increase rapidly, the pressure balance valve can be activated to release pressure. The battery pack is usually equipped with multiple battery cells. The position of the abnormal battery cell in the battery pack is uncertain. The abnormal battery cell instantly discharges high-temperature and high-pressure gas into the battery pack, affecting the normal operation of other battery cells, causing the pressure in the battery pack to rise sharply. The pressure relief method of activating the pressure balance valve to release pressure has a long pressure relief path and low efficiency. It is impossible to discharge the high-temperature and high-pressure gas generated by the abnormal battery cell in time, causing the battery pack to explode and catch fire, threatening the safety of passengers. Utility Model Content

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present application provides a battery box and a battery.

[0005] In the first aspect, an embodiment of the present application provides a battery box, including a box body, a cavity for accommodating multiple battery cells formed therein, a plurality of pressure relief holes provided on the bottom inner wall of the box body, the plurality of pressure relief holes being arranged one-to-one correspondingly to the exhaust valves on the multiple battery cells, and the pressure relief holes penetrating from the bottom inner wall of the box body to the bottom outer wall of the box body.

[0006] Optionally, a sealing structure is provided at the edge of the pressure relief hole, and the sealing structure is connected between the bottom end of the battery cell and the bottom inner wall of the box body, so that the gas discharged from the exhaust valve on the battery cell can be discharged from the box body through the pressure relief hole.

[0007] Optionally, grid ribs are connected to the bottom outer wall of the box body, and the grid ribs include multiple first ribs and multiple second ribs. The multiple first ribs and the multiple second ribs are cross-arranged to form multiple grids, and each pressure relief hole is connected to a corresponding grid.

[0008] Optionally, the first rib and the second rib have a relative first end and a second end along the height direction of the battery box, the first end of the first rib and the first end of the second rib are both connected to the battery box, and the height value from the first end to the second end of the first rib is smaller than the height value from the first end to the second end of the second rib.

[0009] Optionally, a height value from the first end to the second end of the first rib is D1, 3mm≤D1≤5mm; a height value from the first end to the second end of the second rib is D2, 5mm<D2≤15mm.

[0010] Optionally, the box body and the grid ribs form an integrally formed structure.

[0011] Optionally, the second end of the second rib is connected to a protective plate assembly.

[0012] Optionally, the protective plate assembly includes a first protective plate and a second protective plate stacked along a height direction of the box body, the first protective plate is connected to the second end of the second rib, and the first protective plate is a composite plate.

[0013] Optionally, the second protective plate is a metal plate, and reinforcing ribs are provided on the second protective plate.

[0014] In a second aspect, an embodiment of the present application provides a battery, comprising the battery box as described in the first aspect and a plurality of battery cells, wherein at least one exhaust valve is provided on the housing of each of the battery cells;

[0015] The plurality of exhaust valves are arranged in one-to-one correspondence with the plurality of pressure exhaust holes.

[0016] Compared with the prior art, the technical solution provided by the embodiments of the present application has the following advantages:

[0017] The battery box and battery provided in the embodiments of the present application are characterized in that the battery box is provided with a box body having a cavity for placing a plurality of battery cells, and a plurality of exhaust holes corresponding to the exhaust valves of the plurality of battery cells are provided on the bottom inner wall of the box body, so that the high-temperature and high-pressure gas generated by the abnormal battery cells among the plurality of battery cells can be discharged from the box body directly through the exhaust holes corresponding to the exhaust valves through the exhaust valves thereof. The battery box has a short pressure discharge path and high efficiency, and can discharge the high-temperature and high-pressure gas generated by the abnormal battery cells in a timely manner. The high-temperature and high-pressure gas discharged by the abnormal battery cells among the plurality of battery cells will not be discharged into the box body, resulting in the accumulation of gas in the box body to form a pressure difference between the inside and outside of the box body, thereby improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the three-dimensional structure of a battery according to an embodiment of the present application;

[0021] Figure 2 A top view of the structure of the battery described in the embodiment of the present application;

[0022] Figure 3 for Figure 2 AA section view in the figure;

[0023] Figure 4 for Figure 3 A partial enlarged view of point B in the middle.

[0024] Among them, 1, box body; 11, pressure relief hole; 12, bottom inner wall; 13, bottom outer wall;

[0025] 2. Battery cell; 21. Exhaust valve; 3. Sealing structure;

[0026] 4. Grid ribs; 41. First ribs; 42. Second ribs;

[0027] 5. Protective plate assembly; 51. First protective plate; 52. Second protective plate. DETAILED DESCRIPTION

[0028] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the scheme of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0029] In the following description, many specific details are set forth to facilitate a full understanding of the present application, but the present application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only part of the embodiments of the present application, rather than all of the embodiments.

[0030] As the "heart" of electric vehicles, batteries provide electric energy for electric vehicles. The battery cells 2 in the battery pack cannot be 100% safe and there is a risk of fire and explosion. Therefore, the battery cells 2 are usually provided with exhaust valves 21. When the battery cells 2 are abnormal, the battery cells 2 can achieve directional pressure relief through their own exhaust valves 21 and exhaust gas to the box 1 of the battery pack.

[0031] Reference Figures 1 to 4 As shown, this embodiment provides a battery box, including a box body 1, a cavity capable of accommodating a plurality of battery cells 2 is formed in the box body 1, a plurality of pressure relief holes 11 are provided on the bottom inner wall 12 of the box body 1, and the plurality of pressure relief holes 11 are arranged one-to-one correspondingly to the exhaust valves 21 on the plurality of battery cells 2, and the pressure relief holes 11 penetrate from the bottom inner wall 12 of the box body 1 to the bottom outer wall 13 of the box body 1.

[0032] In this way, when any of the multiple battery cells 2 in the box body 1 is abnormal, the exhaust valve 21 of the abnormal battery cell 2 is opened, and the abnormal battery cell 2 discharges the gas in the shell of the abnormal battery cell 2 to the outside of the box body 1 through its own exhaust valve 21 and the pressure discharge hole 11 corresponding to the exhaust valve 21. In other words, the high-temperature and high-pressure gas discharged from the abnormal battery cell 2 among the multiple battery cells 2 will not be discharged into the box body 1, causing the gas in the box body 1 to accumulate and form a pressure difference between the inside and outside of the box body 1. The battery (battery pack) using this battery box has a short pressure discharge path and high efficiency, and can promptly discharge the high-temperature and high-pressure gas generated by the abnormal battery cell 2, thereby improving the safety performance of the battery and making the electrical device using the battery safer.

[0033] In some embodiments, Figure 4 As shown, a sealing structure 3 is provided at the edge of the pressure relief hole 11, and the sealing structure 3 is connected between the bottom end of the battery cell 2 and the bottom inner wall 12 of the box body 1, so that the gas discharged from the exhaust valve 21 on the battery cell 2 can be discharged from the box body 1 through the pressure relief hole 11, that is, it is prevented that the gas discharged from the exhaust valve 21 of the abnormal battery cell 2 enters other parts of the box body 1 through the gap between the bottom end of the battery cell 2 and the bottom inner wall 12 of the box body 1 to affect other battery cells 2 or cause gas accumulation in the box body 1.

[0034] The sealing structure 3 may be a sealant, and the bottom end of the battery cell 2 and the bottom inner wall 12 of the box body 1 are sealed and connected as a whole by the sealant. The sealing structure 3 may also be a sealing gasket, and a sealing gasket is arranged between the bottom end of the battery cell 2 and the bottom inner wall 12 of the box body 1, so as to prevent the gas discharged from the exhaust valve 21 of the abnormal battery cell 2 from entering other parts of the box body 1 through the gap between the bottom end of the battery cell 2 and the bottom inner wall 12 of the box body 1.

[0035] The sealing structure 3 uses a sealing gasket, and the sealing structure 3 has a low cost. The sealing structure 3 uses a sealant, and the battery cell 2 is bonded to the box body 1 through the sealant, which further plays a role in fixing the battery cell 2 in the box body 1.

[0036] In some embodiments, the bottom outer wall 13 of the box body 1 is connected with a mesh rib 4, which includes a plurality of first ribs 41 and a plurality of second ribs 42. The plurality of first ribs 41 and the plurality of second ribs 42 are cross-arranged to form a plurality of meshes, and each pressure relief hole 11 is connected to a corresponding mesh. While the mesh rib 4 supports and strengthens the strength of the box body 1, the gas discharged from the exhaust valve 21 on the battery cell 2 enters the mesh through the pressure relief hole 11 and then is discharged. The mesh rib 4 serves as a temperature transfer medium for the high-temperature gas, and the high-temperature gas dissipates heat faster through the mesh rib 4.

[0037] Furthermore, in some embodiments, the first rib 41 and the second rib 42 have opposite first and second ends along the height direction of the battery box, the first end of the first rib 41 and the first end of the second rib 42 are both connected to the battery box, and the height value from the first end to the second end of the first rib 41 is less than the height value from the first end to the second end of the second rib 42. In this way, two adjacent second ribs 42 form a gas channel, so that the gas in a single grid flows quickly through the gas channel and is discharged.

[0038] In specific implementation, the height value from the first end to the second end of the first rib 41 is D1, 3mm≤D1≤5mm; the height value from the first end to the second end of the second rib 42 is D2, 5mm<D2≤15mm. The cross-sectional shape of the mesh rib 4 can be rectangular, circular or diamond-shaped.

[0039] In specific implementation, in some embodiments, the box body 1 and the grid ribs 4 are an integrally formed structure, and the box body 1 and the grid ribs 4 can be formed into an integrally formed structure by injection molding, embedded injection molding or casting. The box body 1 and the grid ribs 4 of the integrally formed structure not only omit the installation process, but also have a higher connection strength.

[0040] In some embodiments, the second end of the second rib 42 is connected to a protective plate assembly 5, which protects the box body 1 to prevent a vehicle or other battery-using device from colliding during driving, causing the bottom of the box body 1 to be hit, or flying stones or other debris on the road from hitting the box body 1, causing it to be worn, vibrated or squeezed.

[0041] In specific implementation, the protective plate assembly 5 includes a first protective plate 51 and a second protective plate 52 stacked along the height direction of the box body 1. The first protective plate 51 is connected to the second end of the second rib 42. The first protective plate 51 is a composite plate. The composite plate has toughness and can absorb the energy of vibration or impact. The first protective plate 51 has a buffering effect on the box body 1.

[0042] The second protective plate 52 is a metal plate, and a reinforcing rib is provided on the second protective plate 52 to improve the strength of the second protective plate 52. The high-strength second protective plate 52 can effectively resist impact or extrusion, and protects the box body 1 and the first protective plate 51.

[0043] Another embodiment of the present application provides a battery, including the above-mentioned battery box and multiple battery cells 2, each battery cell 2 having at least one exhaust valve 21 on its shell. The exhaust valve 21 can be an explosion-proof valve or a breathable breathing valve, which is a valve that ensures that the space inside the shell of the battery cell 2 is isolated from the atmosphere within a certain pressure range, and can communicate with the atmosphere (breathe) when the pressure exceeds or falls below this pressure range. The multiple exhaust valves 21 of the multiple battery cells 2 are arranged in a one-to-one correspondence with the multiple pressure relief holes 11.

[0044] The battery (battery pack) using the battery box has a short pressure discharge path and high efficiency, and can promptly discharge the high-temperature and high-pressure gas generated by the abnormal battery cell 2, thereby improving the safety performance of the battery and making the electrical device using the battery safer.

[0045] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0046] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery box, characterized in that: The invention comprises a box body (1), wherein a cavity for accommodating a plurality of battery cells (2) is formed in the box body (1), a plurality of pressure relief holes (11) are arranged on the bottom inner wall (12) of the box body (1), the plurality of pressure relief holes (11) are arranged in one-to-one correspondence with the exhaust valves (21) on the plurality of battery cells (2), and the pressure relief holes (11) penetrate from the bottom inner wall (12) of the box body (1) to the bottom outer wall (13) of the box body (1).

2. The battery box according to claim 1, characterized in that: A sealing structure (3) is provided at the edge of the pressure relief hole (11), and the sealing structure (3) is connected between the bottom end of the battery cell (2) and the bottom inner wall (12) of the box body (1), so that the gas discharged from the exhaust valve (21) on the battery cell (2) can be discharged from the box body (1) through the pressure relief hole (11).

3. The battery box according to claim 1, characterized in that: A grid rib (4) is connected to the bottom outer wall (13) of the box body (1), and the grid rib (4) includes a plurality of first ribs (41) and a plurality of second ribs (42). The plurality of first ribs (41) and the plurality of second ribs (42) are cross-arranged to form a plurality of grids, and each pressure relief hole (11) is connected to a corresponding grid.

4. The battery box according to claim 3, characterized in that: The first rib (41) and the second rib (42) both have a first end and a second end opposite to each other along the height direction of the battery box; the first end of the first rib (41) and the first end of the second rib (42) are both connected to the battery box; and the height value from the first end to the second end of the first rib (41) is smaller than the height value from the first end to the second end of the second rib (42).

5. The battery box according to claim 4, characterized in that: The height value from the first end to the second end of the first rib (41) is D1, 3mm≤D1≤5mm; the height value from the first end to the second end of the second rib (42) is D2, 5mm<D2≤15mm.

6. The battery box according to any one of claims 3 to 5, characterized in that: The box body (1) and the grid ribs (4) form an integrally formed structure.

7. The battery box according to claim 4, characterized in that: The second end of the second rib (42) is connected to a protective plate assembly (5).

8. The battery box according to claim 7, characterized in that: The protective plate assembly (5) comprises a first protective plate (51) and a second protective plate (52) which are stacked along the height direction of the box body (1); the first protective plate (51) is connected to the second end of the second rib (42); and the first protective plate (51) is a composite plate.

9. The battery box according to claim 8, characterized in that: The second protective plate (52) is a metal plate, and a reinforcing rib is provided on the second protective plate (52).

10. A battery, characterized in that: Comprising a battery box as claimed in any one of claims 1 to 9 and a plurality of battery cells (2), wherein at least one exhaust valve (21) is provided on the shell of each of the battery cells (2); The plurality of exhaust valves (21) are arranged in one-to-one correspondence with the plurality of pressure exhaust holes (11).

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