Battery box and battery pack

Abstract

The battery box comprises a box body, a bottom protection plate, a support and a suction cup, the box body is provided with a containing cavity, an opening communicated with the containing cavity is formed in one side, in the first direction, of the box body, the bottom protection plate is detachably connected to the opening, the support is installed on the cavity wall of the containing cavity, and the suction cup is installed on the support. The support and the bottom protection plate are spaced to form a pressure relief channel, the pressure relief channel is used for relieving thermal runaway gas of the battery cell assembly on the support, a suction cup is arranged on the side, facing the bottom protection plate, of the support, and the suction cup abuts against the bottom protection plate. According to the battery box disclosed by the utility model, the bracket and the bottom protection plate are connected by using the suction cups, the disassembly and assembly are convenient, the connection strength of the middle area of the bottom protection plate is effectively improved, the impact strength of the bottom protection plate can be improved by supporting the bottom protection plate through the suction cups, and the deformation of the bottom protection plate under external impact is reduced, so that the use safety of the battery box is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] With the rapid development of the new energy vehicle industry, lithium battery modules are widely used in new energy vehicles. Lithium battery modules include battery boxes and cell modules. The cell modules are arranged in the battery box. In order to prevent the safety of other single cells in the lithium battery module from being affected by thermal runaway of individual single cells, corresponding thermal runaway designs are usually configured.

[0003] At present, the thermal runaway design of lithium battery modules is usually to set a pressure relief channel on the battery box to quickly discharge the thermal runaway gas of a single cell, thereby preventing the thermal runaway of other cells from being affected. The pressure relief channel is usually formed by the tray supporting the cell module and the bottom guard plate of the battery box. The existing technology has the following defects: only the edge of the bottom guard plate is connected to the frame of the box, the middle of the bottom guard plate is suspended, and the connection strength and impact strength are poor. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide a battery box and a battery pack, which have a simple structure and high connection strength and impact strength of the bottom guard plate.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In a first aspect, a battery box is provided, comprising a box body, a bottom guard plate, a bracket and a suction cup, the box body having a accommodating cavity, a side of the box body along a first direction is provided with an opening connected to the accommodating cavity, the bottom guard plate is detachably connected to the opening, the bracket is mounted on the cavity wall of the accommodating cavity, and a pressure relief channel is formed between the bracket and the bottom guard plate, the pressure relief channel is used to relieve the thermal runaway gas of the battery cell assembly on the bracket, and the suction cup is provided on a side of the bracket facing the bottom guard plate, and the suction cup abuts against the bottom guard plate.

[0007] As a preferred solution for the battery box, a plurality of communication holes are provided through the bracket, the number of the communication holes corresponds one-to-one to the number of cells in the cell assembly, and the communication holes are arranged opposite to the explosion-proof valves of the cells.

[0008] As a preferred solution for the battery box, a plurality of plug-in slots are recessed on one side of the bracket away from the bottom guard plate, the connecting holes are arranged through the bottoms of the plug-in slots, and the plug-in slots are used for supplying the battery cells.

[0009] As a preferred solution for the battery box, the bracket is provided with a plurality of support parts protruding at intervals toward one side of the bottom guard plate, and each of the support parts is provided with at least one suction cup.

[0010] As a preferred solution of the battery box, an exhaust port is provided on the box body, and the exhaust port is communicated with the pressure relief channel.

[0011] As a preferred solution of the battery box, the battery box further comprises an explosion-proof plate, and the explosion-proof plate is used to block the exhaust port.

[0012] As a preferred solution for the battery box, the bracket is detachably connected to the cavity wall of the accommodating cavity.

[0013] As a preferred solution for the battery box, a guide groove is recessed on the cavity wall of the accommodating cavity, and the length of the guide groove extends along the first direction. A guide portion is provided on the bracket, and the guide portion is inserted into the guide groove.

[0014] In a second aspect, a battery pack is provided, comprising a cell assembly and the above-mentioned battery box, wherein the cell assembly is mounted on a bracket of the battery box, and the cell assembly is located on a side of the bracket away from the bottom guard plate.

[0015] As a preferred solution of the battery pack, the battery pack also includes a pressure plate, and a mounting opening communicating with the accommodating cavity of the box body is provided on the side of the battery box body away from the bottom guard plate, and the pressure plate is provided at the mounting opening, and the pressure plate is used to press against the battery cell assembly.

[0016] The beneficial effects of the embodiments of the utility model are as follows: by arranging a detachable connection between the bottom guard plate and the box body, the production convenience of the battery box can be effectively improved, and the subsequent replacement of the bottom guard plate is convenient, thereby reducing the maintenance cost of the battery box; the bracket is connected to the bottom guard plate by using a suction cup, which is convenient for disassembly and assembly, and effectively improves the connection strength of the middle area of ​​the bottom guard plate; the support of the bottom guard plate by the suction cup can also improve the impact strength of the bottom guard plate, and reduce the deformation of the bottom guard plate under external impact; and when the thermal runaway gas of the battery cell assembly enters the pressure relief channel, the increase in air pressure in the pressure relief channel enables the suction cup to be separated from the connection with the bottom guard plate, and the bottom guard plate bulges outward in the direction away from the bracket under the push of the air pressure of the thermal runaway gas, so as to increase the volume of the pressure relief channel, thereby improving the safety of the battery box. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below based on the drawings and embodiments.

[0018] Figure 1 It is a structural schematic diagram of a battery box according to an embodiment of the utility model.

[0019] Figure 2It is a cross-sectional view of a battery box according to an embodiment of the utility model.

[0020] Figure 3 It is a schematic diagram of the partial structure of the battery box according to an embodiment of the utility model.

[0021] In the figure:

[0022] 1. Box body; 11. Accommodating chamber; 12. Pressure relief channel; 13. Exhaust port; 14. Guide groove; 2. Bottom guard plate; 3. Bracket; 31. Connecting hole; 32. Plug-in slot; 33. Support part; 4. Suction cup; 5. Press plate. DETAILED DESCRIPTION

[0023] In order to make the technical problems solved by the utility model, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0026] like Figure 1 and Figure 2As shown, the battery box of the utility model embodiment includes a box body 1, a bottom guard plate 2, a bracket 3 and a suction cup 4, the box body 1 has a accommodating cavity 11, and an opening communicating with the accommodating cavity 11 is provided on one side of the box body 1 along the first direction, and the bottom guard plate 2 is detachably connected to the opening, the bracket 3 is installed on the cavity wall of the accommodating cavity 11, and the bracket 3 and the bottom guard plate 2 are spaced to form a pressure relief channel 12, the pressure relief channel 12 is used to relieve the thermal runaway gas of the battery cell assembly on the bracket 3, and a suction cup 4 is provided on the side of the bracket 3 facing the bottom guard plate 2, and the suction cup 4 abuts against the bottom guard plate 2.

[0027] It can be understood that when the battery box is in normal use, the bottom guard plate 2 is located at the bottom, and the first direction is the height direction. By detachably connecting the bottom guard plate 2 and the box body 1, that is, splitting a complex integral component into multiple simple parts for production, the production convenience of the battery box can be effectively improved, and it is convenient to replace the bottom guard plate 2 when it is damaged by impact, thereby reducing the maintenance cost of the battery box. The bracket 3 is connected to the bottom guard plate 2 by the suction cup 4. On the one hand, it is convenient to disassemble and assemble, and it is convenient to connect compared with detachable connection methods such as bolt connection, which reduces the working intensity, and the sealing performance at the connection position is good, which ensures the sealing performance of the pressure relief channel 12 and reduces the entry of moisture or other impurities into the battery box. On the other hand, it can effectively improve the connection strength of the middle area of ​​the bottom guard plate 2. The support of the suction cup 4 to the bottom guard plate 2 can also improve the impact strength of the bottom guard plate 2, that is, when the bottom guard plate 2 is impacted by the outside, the supporting force provided by the suction cup 4 can alleviate part of the impact force, and reduce the deformation of the bottom guard plate 2 under the external impact. When the thermal runaway gas of the battery cell assembly enters the pressure relief channel 12, the increase in the air pressure in the pressure relief channel 12 enables the suction cup 4 to be separated from the connection with the bottom guard plate 2. The bottom guard plate 2 bulges outward in the direction away from the bracket 3 under the push of the air pressure of the thermal runaway gas, so as to increase the volume of the pressure relief channel 12, thereby improving the safety of the battery box.

[0028] Specifically, a first threaded hole is provided at the bottom of the box body 1, and a plurality of first through holes are provided on the bottom guard plate 2. A first bolt is passed through the first through hole and screwed into the first threaded hole to connect the bottom guard plate 2 to the box body 1. The threaded connection is convenient for assembly and disassembly, and the connection is stable. In other embodiments, a buckle may be provided on the bottom guard plate 2, and a slot may be provided on the box body 1, and the connection is achieved by a buckle and a slot being connected, which is not limited here.

[0029] Alternatively, if Figure 2 and Figure 3As shown, a plurality of connecting holes 31 are provided through the bracket 3, and the number of the connecting holes 31 corresponds to the number of cells in the cell assembly, and the connecting holes 31 are arranged opposite to the explosion-proof valve of the cell. The connecting holes 31 are arranged so that the gas generated when the cell has thermal runaway can be quickly transferred to the pressure relief channel 12, and each cell pressure relief valve is provided with a corresponding connecting hole 31, and the pressure relief distance is short, which reduces the influence of the high temperature spread of the thermal runaway gas on other cells.

[0030] Furthermore, if Figure 2 and Figure 3 As shown, a plurality of plug-in slots 32 are provided in a recessed manner on one side of the bracket 3 away from the bottom guard plate 2, and a communication hole 31 is provided through the bottom of the plug-in slot 32, and the plug-in slot 32 is used to provide the battery cell for insertion. The plug-in slot 32 is provided to facilitate the positioning of the battery cell when it is installed on the bracket 3, and to improve the positioning accuracy of the battery cell installation; and the wall of the plug-in slot 32 is used to limit the peripheral side of the battery cell, so as to strengthen the connection strength of the battery cell installation.

[0031] Preferably, if Figure 2 As shown, the bracket 3 is provided with a plurality of support portions 33 protruding at intervals toward one side of the bottom guard plate 2, and each support portion 33 is provided with at least one suction cup 4. The arrangement of the support portions 33 can ensure that the suction cup 4 is connected to the bottom guard plate 2 at a certain distance between the bottom guard plate 2 and the bracket 3, and strengthen the support of the bracket 3 to the suction cup 4.

[0032] In some embodiments, Figure 1 As shown, an exhaust port 13 is provided on the box body 1, and the exhaust port 13 is connected to the pressure relief channel 12. Through the provision of the exhaust port 13, the thermal runaway gas generated by the battery cell can be quickly discharged to the outside of the box body 1, and the thermal runaway gas is prevented from accumulating in the pressure relief channel 12 and exploding. In this embodiment, the exhaust port 13 is provided on the side wall of the box body 1. Compared with the exhaust port 13 being provided on the bottom guard plate 2, it can avoid the exhaust port 13 facing the ground during daily use, and reduce the occurrence of impurities or moisture entering the pressure relief channel 12.

[0033] Furthermore, the battery box also includes an explosion-proof plate, which is used to block the exhaust port 13. The explosion-proof plate can be broken when the thermal runaway gas reaches a certain pressure to open the exhaust port 13, so that the pressure relief channel 12 is connected to the outside. Through the setting of the explosion-proof plate, the exhaust port 13 can be blocked in daily use, the sealing of the pressure relief channel 12 is ensured, and external impurities are prevented from entering the pressure relief channel 12 to affect the use of the battery cell, thereby improving the safety of the battery box 1.

[0034] Preferably, the thickness of the explosion-proof plate at the center is smaller than that at the edge. This design can ensure the connection strength between the explosion-proof plate and the box body 1, and can also enable the explosion-proof plate to explode preferentially from the weak area under the impact of thermal runaway gas, thereby ensuring the safety of the explosion-proof plate.

[0035] Optionally, the bracket 3 is detachably connected to the cavity wall of the accommodating cavity 11. The detachable setting facilitates the production of the battery box, reduces the production cost, and the bracket 3 and the box body 1 can be replaced separately during later maintenance, and the maintenance cost is low. In this embodiment, a second through hole is provided on the bracket 3, and a second threaded hole is provided on the box body 1. The second bolt passes through the second through hole and is screwed into the second threaded hole to fix the bracket 3 and the box body 1. The connection is firm, ensuring the connection stability of the bracket 3. In other embodiments, the bracket 3 can also be connected by other detachable methods such as snap-on, which are not described in detail here.

[0036] Furthermore, a guide groove 14 is recessed on the cavity wall of the accommodating cavity 11, and the length of the guide groove 14 extends along the first direction, and a guide portion is provided on the bracket 3, and the guide portion is inserted into the guide groove 14. Through the cooperation between the guide portion and the guide groove 14, the guidance of the bracket 3 during installation can be strengthened, and the installation accuracy of the bracket 3 connection can be improved.

[0037] like Figures 1 to 3 As shown, an embodiment of the utility model further provides a battery pack including a battery cell assembly and a battery box of any of the above embodiments, wherein the battery cell assembly is mounted on a bracket 3 of the battery box, and the battery cell assembly is located on a side of the bracket 3 away from the bottom guard plate 2. The bracket 3 and the bottom guard plate 2 in the battery box of the battery pack are spaced to form a pressure relief channel 12, so as to facilitate the discharge of gas caused by thermal runaway of the battery cell and improve the safety of the battery pack.

[0038] Optionally, the battery pack further includes a pressure plate 5. A mounting opening communicating with the accommodating cavity 11 of the box body 1 is provided on the side of the battery box body 1 away from the bottom guard plate 2. A pressure plate 5 is provided at the mounting opening. The pressure plate 5 is used to press against the battery cell assembly. It is understandable that the installation sequence of the battery cell module is as follows: first install the bottom guard plate 2 onto the box body 1 to block the opening of the box body 1, and then install the bracket 3 provided with the battery cell assembly into the accommodating cavity 11. During installation, it is only necessary to install the bracket 3 to adsorb the suction cup 4 onto the bottom guard plate 2 to complete the reinforced connection of the middle position of the bottom guard plate 2. Finally, install the pressure plate 5 into the box body 1 to press against the battery cell assembly to ensure the installation stability of the battery cell assembly.

[0039] Preferably, an avoidance hole is provided on the pressure plate 5 corresponding to the position of the protruding pole of each battery cell in the battery cell assembly. The setting of the avoidance hole reduces the space occupied by the protruding pole of the battery cell, improves the space utilization in the accommodating cavity 11, and the restriction of the hole wall of the avoidance hole on the pole can enhance the installation stability of the battery cell.

[0040] Furthermore, during the battery pack assembly process, potting glue may be injected into the pressing plate 5 and the bracket 3 to enhance the installation stability of the battery cell assembly and the heat insulation between the battery cells.

[0041] Furthermore, a cold gel pad may be provided on the side of the bottom guard plate 2 facing the bracket 3. The cold gel pad has good thermal conductivity and can accelerate the heat dissipation of the battery cell assembly or the cooling of the thermal runaway gas.

[0042] In the description of this article, it is necessary to understand that the terms "upper", "lower", etc., and the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] In the description of this specification, the description of reference term "an embodiment" etc. means that the specific features, structures, materials or characteristics of the embodiment are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment.

[0044] In addition, it should be understood that although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0045] The technical principle of the present invention is described above in combination with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the protection scope of the present invention in any way. Based on the explanations here, technicians in this field can think of other specific implementation methods of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A battery box, characterized in that: The invention comprises a box body, a bottom guard plate, a bracket and a suction cup, wherein the box body has a accommodating cavity, and an opening communicating with the accommodating cavity is arranged on one side of the box body along a first direction, and the bottom guard plate is detachably connected to the opening, and the bracket is mounted on the cavity wall of the accommodating cavity, and a pressure relief channel is formed between the bracket and the bottom guard plate, and the pressure relief channel is used to relieve the thermal runaway gas of the battery cell assembly on the bracket, and the suction cup is arranged on a side of the bracket facing the bottom guard plate, and the suction cup abuts against the bottom guard plate.

2. The battery box according to claim 1, characterized in that: The bracket is provided with a plurality of communication holes, the number of the communication holes corresponds to the number of the battery cells of the battery cell assembly, and the communication holes are arranged opposite to the explosion-proof valves of the battery cells.

3. The battery box according to claim 2, characterized in that: A plurality of plug-in slots are recessed on one side of the bracket away from the bottom guard plate, the connecting holes are arranged through the bottoms of the plug-in slots, and the plug-in slots are used for supplying the battery cells.

4. The battery box according to any one of claims 1 to 3, characterized in that: The bracket is provided with a plurality of support parts protruding at intervals toward one side of the bottom guard plate, and each of the support parts is provided with at least one suction cup.

5. The battery box according to any one of claims 1 to 3, characterized in that: An exhaust port is provided on the box body, and the exhaust port is communicated with the pressure relief channel.

6. The battery box according to claim 5, characterized in that: It also includes an explosion-proof disk, which is used to block the exhaust port.

7. The battery box according to any one of claims 1 to 3, characterized in that: The bracket is detachably connected to the cavity wall of the accommodating cavity.

8. The battery box according to claim 7, characterized in that: A guide groove is recessed on the cavity wall of the accommodating cavity, and the length of the guide groove extends along the first direction. A guide portion is provided on the bracket, and the guide portion is inserted into the guide groove.

9. A battery pack, characterized in that: It comprises a battery cell assembly and a battery box as described in any one of claims 1 to 8, wherein the battery cell assembly is mounted on a bracket of the battery box, and the battery cell assembly is located on a side of the bracket away from the bottom guard plate.

10. The battery pack according to claim 9, characterized in that: The battery pack also includes a pressure plate. A mounting opening communicating with the accommodating cavity of the battery box is provided on one side of the battery box away from the bottom guard plate. The pressure plate is provided at the mounting opening and is used to press against the battery cell assembly.

Images