Battery pack box body and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery pack box body and a battery pack, the battery pack box body comprises a box body shell, an upper cover plate, a bottom protection plate and at least one pressure relief valve, a pressure relief cavity formed by an upper layer plate, a lower layer plate and a plurality of connecting tables is arranged in the bottom protection plate, the upper layer plate is further provided with a pressure relief hole communicated with the pressure relief cavity, and the lower layer plate is provided with a pressure relief hole communicated with the pressure relief cavity. A buffering cavity communicated with the pressure relief cavity is formed in the box body shell, and the pressure relief valve is arranged on the box body shell and communicated with the buffering cavity. The pressure relief cavity is formed in the bottom protective plate, and the buffer cavity communicated with the pressure relief cavity and the pressure relief valve communicated with the buffer cavity are arranged on the box body shell, so that thermal runaway gas in the battery sequentially enters the pressure relief cavity and the buffer cavity through the pressure relief hole after breaking through the anti-explosion valve and is finally discharged through the pressure relief valve on the box body shell; the pressure gas in the battery is released, the pressure relief path of the thermal runaway gas is limited, and the thermal runaway gas is prevented from flowing around and damaging internal devices, so that the battery has relatively good protection property and relatively high safety.

Description

Technical Field

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

[0002] With the increasing demand for energy supply, in order to improve the power supply efficiency, multiple batteries are often combined and energy is supplied in the form of a battery pack. After a single battery is used for a long time, the temperature will rise, which not only affects the power supply efficiency of the single battery, but also causes pressurized gas to be generated inside the battery due to the increase in temperature. When the pressure is too high, there is a safety hazard of explosion. Therefore, currently, an explosion-proof valve is set on the single battery, so that when the internal pressure of the battery is too high, the thermal runaway gas breaks through the explosion-proof valve, thereby achieving the purpose of decompression protection inside the battery.

[0003] However, the battery pack is a relatively closed environment. In addition to multiple interconnected single cells, it also has an electrical module for management. When the internal pressure of one of the single cells is too high, causing the thermal runaway gas to break through the explosion-proof valve, the thermal runaway gas will run rampant in the battery pack, causing damage to other single cells and the electrical module for management.

[0004] Therefore, there is an urgent need for a battery pack case and a battery pack to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a battery pack box and a battery pack, which ensure the pressure relief path of thermal runaway gas, have good protection and high safety.

[0006] To achieve this purpose, the utility model adopts the following technical solutions:

[0007] In one aspect, a battery pack case is provided, the battery pack case comprising:

[0008] A bottom guard plate, the bottom guard plate comprises an upper plate, a lower plate and a plurality of connection platforms, the plurality of connection platforms are arranged between the upper plate and the lower plate at intervals to form a pressure relief cavity between the upper plate and the lower plate, the upper plate is used to carry a plurality of batteries, and is provided with pressure relief holes corresponding to the explosion-proof valves on each of the batteries, the pressure relief holes are connected to the pressure relief cavity;

[0009] A box shell, the bottom guard plate is connected to one side of the box shell, and a buffer chamber connected to the pressure relief chamber is provided in the box shell;

[0010] at least one pressure relief valve, at least one of the pressure relief valves is disposed on the housing and communicates with the buffer chamber;

[0011] An upper cover plate, which is connected to the other side of the box body shell and cooperates with the bottom protection plate to form a receiving chamber for receiving a plurality of the batteries.

[0012] Optionally, the box body shell includes four side plates connected in sequence end to end. Each of the side plates is provided with the buffer chamber, and the buffer chambers in the four side plates communicate with each other. At least one pressure relief valve is connected to any one of the side plates and communicates with the corresponding buffer chamber.

[0013] Optionally, each of the side plates is provided with a first pressure relief window communicating with the buffer chamber. The upper layer plate is provided with a second pressure relief window corresponding to and communicating with the first pressure relief window, and the second pressure relief window communicates with the pressure relief chamber.

[0014] Optionally, the lower layer plate is provided with a receiving groove, and a plurality of connecting platforms are arranged in the receiving groove. The upper layer plate is connected to the plurality of connecting platforms, and the outer periphery of the upper layer plate fits against the groove wall of the receiving groove to close the receiving groove and construct the pressure relief chamber.

[0015] Optionally, the lower layer plate is further provided with a first connecting flange surrounding the receiving groove, and the first connecting flange is used for connecting with the box body shell.

[0016] Optionally, the upper layer plate has a first surface facing the battery, and the first connecting flange has a second surface facing the box body shell. The first surface of the upper layer plate located in the receiving groove is lower than the second surface to form a limiting groove on the bottom protection plate. A limiting protrusion is provided on one side of the box body shell facing the bottom protection plate, and the limiting protrusion is inserted into the limiting groove.

[0017] Optionally, the battery pack box body further includes a fixing bracket, and the fixing bracket is provided with a plurality of placement holes for carrying the batteries, and the placement holes communicate with the pressure relief holes in one-to-one correspondence.

[0018] Optionally, an insertion protrusion surrounding the placement hole is provided on one side of the fixing bracket facing the upper layer plate, and the insertion protrusion is inserted into the pressure relief hole.

[0019] Optionally, the upper layer plate is further provided with welding through holes corresponding to the plurality of connecting platforms one by one.

[0020] Optionally, the upper cover plate is provided with a second connecting flange for connecting with the box body shell.

[0021] On the other hand, a battery pack is provided, and the battery pack includes the battery pack box body according to any one of the above.

[0022] Advantages of the present utility model:

[0023] The utility model provides a battery pack box body. By arranging a plurality of connecting platforms between the upper layer plate and the lower layer plate, a pressure relief cavity communicating with the pressure relief holes on the upper layer plate is formed between the upper layer plate and the lower layer plate. A buffer cavity communicating with the pressure relief cavity is arranged on the box body shell, and at least one pressure relief valve communicating with the buffer cavity is arranged on the box body shell. When the thermal runaway gas in the battery breaks through the explosion-proof valve, it enters the pressure relief cavity and the buffer cavity in sequence through the pressure relief holes, and finally is discharged through the pressure relief valve connected to the box body shell. On the one hand, the pressure gas inside the battery can be released, and on the other hand, the pressure relief path of the thermal runaway gas is limited to avoid the thermal runaway gas from scurrying around and damaging the internal components, so that it has good protection and high safety.

[0024] The utility model also provides a battery pack. By applying the above-mentioned battery pack box body, the thermal runaway gas can be controlled, the components in the battery pack can be prevented from being damaged due to the impact of the thermal runaway gas, the protection of the internal components of the battery pack is improved, and the service life of the battery pack is prolonged. Description of the Drawings

[0025] Figure 1 is the structural exploded view of the battery pack provided by the utility model;

[0026] Figure 2 is the cross-sectional view of the battery pack provided by the utility model;

[0027] Figure 3 is the structural exploded view of the bottom guard plate in the battery pack box body provided by the utility model;

[0028] Figure 4 is the structural schematic diagram of the upper layer plate constituting the bottom guard plate in the battery pack box body provided by the utility model;

[0029] Figure 5 is the structural schematic diagram of the lower layer plate constituting the bottom guard plate in the battery pack box body provided by the utility model;

[0030] Figure 6 is the structural schematic diagram of the upper cover plate in the battery pack box body provided by the utility model;

[0031] Figure 7 is the structural schematic diagram of the fixing bracket in the battery pack box body provided by the utility model;

[0032] Figure 8 is Figure 7 the sectional view along the A-A direction.

[0033] In the figure:

[0034] 100. Battery;

[0035] 1. Box housing; 11. Buffer cavity; 12. First pressure relief window;

[0036] 2. Upper cover plate; 21. Second connecting flange;

[0037] 3. Bottom guard plate; 31. Upper layer plate; 311. Pressure relief hole; 312. Second pressure relief window; 313. Welding through hole; 32. Lower layer plate; 321. Accommodating groove; 322. First connecting flange; 323. Positioning hole; 33. Connecting platform; 34. Pressure relief cavity;

[0038] 4. Fixed bracket; 41. Placement hole; 42. Insertion protrusion;

[0039] 5. Pressure relief valve. Detailed implementation mode

[0040] The following further describes the present utility model in detail with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model rather than all structures are shown in the drawings.

[0041] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0042] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "above", and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or simply indicating that the horizontal height of the first feature is lower than that of the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "right", etc., are based on the directions or positions shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] With the increasing demand for energy supply, in order to improve the power supply efficiency, multiple batteries are often combined and energy is supplied in the form of a battery pack. After a single battery is used for a long time, the temperature will rise, which not only affects the power supply efficiency of the single battery, but also causes pressurized gas to be generated inside the battery due to the increase in temperature. When the pressure is too high, there is a safety hazard of explosion. Therefore, currently, an explosion-proof valve is set on the single battery, so that when the internal pressure of the battery is too high, the thermal runaway gas breaks through the explosion-proof valve, thereby achieving the purpose of decompression protection inside the battery.

[0045] However, the battery pack is a relatively closed environment. In addition to multiple interconnected single cells, it also has an electrical module for management. When the internal pressure of one of the single cells is too high, causing the thermal runaway gas to break through the explosion-proof valve, the thermal runaway gas will run rampant in the battery pack, causing damage to other single cells and the electrical module for management.

[0046] Therefore, in order to reduce the adverse effects caused by thermal runaway gases and improve the protection and safety of internal components of the battery pack, this embodiment provides a battery pack case.

[0047] like Figures 1 to 8 As shown, the battery pack case includes a case shell 1, an upper cover plate 2, a bottom guard plate 3 and a pressure relief valve 5. The bottom guard plate 3 includes an upper plate 31, a lower plate 32 and a plurality of connecting platforms 33. The plurality of connecting platforms 33 are spaced between the upper plate 31 and the lower plate 32 to form a pressure relief chamber 34 between the upper plate 31 and the lower plate 32. The upper plate 31 is used to carry a plurality of batteries 100, and is provided with pressure relief holes 311 corresponding to the explosion-proof valves on each battery 100. The pressure relief holes 311 are connected to the pressure relief chamber 34. The bottom guard plate 3 is connected to one side of the case shell 1. A buffer chamber 11 connected to the pressure relief chamber 34 is provided in the case shell 1. At least one pressure relief valve 5 is provided on the case shell 1 and is connected to the buffer chamber 11. The upper cover plate 2 is connected to the other side of the case shell 1 and cooperates with the bottom guard plate 3 to form a accommodating chamber for accommodating a plurality of batteries 100.

[0048] By arranging a plurality of connecting platforms 33 between the upper layer plate 31 and the lower layer plate 32, a pressure relief cavity 34 communicating with the pressure relief hole 311 on the upper layer plate 31 is formed between the upper layer plate 31 and the lower layer plate 32. A buffer cavity 11 communicating with the pressure relief cavity 34 is arranged on the box body shell 1, and at least one pressure relief valve 5 communicating with the buffer cavity 11 is arranged on the box body shell 1. So that the thermal runaway gas in the battery 100 enters the pressure relief cavity 34 and the buffer cavity 11 in sequence through the pressure relief hole 311 after breaking through the explosion-proof valve, and finally is discharged through the pressure relief valve 5 connected to the box body shell 1. On the one hand, it can release the pressure gas inside the battery 100, and on the other hand, it also limits the pressure relief path of the thermal runaway gas to avoid the thermal runaway gas from scurrying around and damaging internal components, thus having better protection and higher safety.

[0049] The battery pack box body can be used to store various types of batteries 100. In this embodiment, it is mainly used to store large cylindrical batteries. Among them, both the upper layer plate 31 and the lower layer plate 32 are sheet metals. When assembling the bottom protection plate 3, first fix a plurality of connecting platforms 33 at the set positions on the lower layer plate 32 by welding, and then connect the upper layer plate 31 to the plurality of connecting platforms 33 by welding, so that the lower layer plate 32, the connecting platforms 33 and the upper layer plate 31 are connected into a whole, thereby improving the structural strength of the bottom protection plate 3.

[0050] Optionally, the box body shell 1 includes four side plates connected in sequence end to end. A buffer cavity 11 is arranged inside each side plate, and the buffer cavities 11 inside the four side plates communicate with each other. At least one pressure relief valve 5 is connected to any one of the side plates and communicates with the corresponding buffer cavity 11. By arranging the buffer cavities 11 communicating with each other inside the side plates constituting the box body shell 1, the volume of the buffer cavity 11 is increased, and it has a strong buffering ability.

[0051] Optionally, a first pressure relief window 12 communicating with the buffer cavity 11 is opened on each side plate, and a second pressure relief window 312 corresponding to and communicating with the first pressure relief window 12 is opened on the upper layer plate 31, and the second pressure relief window 312 communicates with the pressure relief cavity 34. By arranging the first pressure relief window 12 communicating with the buffer cavity 11 on the side plate and opening the second pressure relief window 321 on the upper layer plate 31, the communication between the pressure relief cavity 34 and the buffer cavity 11 is realized. In this embodiment, one first pressure relief window 12 is arranged on each side plate, so four second pressure relief windows 312 are opened on the upper layer plate 31 corresponding to them one by one. Thus, the speed of the thermal runaway gas flowing from the pressure relief cavity 34 into the buffer cavity 11 is accelerated.

[0052] Optionally, as Figure 3 、 Figure 5As shown in the figure, the lower layer plate 32 is provided with a receiving groove 321, and a plurality of connecting platforms 33 are arranged in the receiving groove 321. The upper layer plate 31 is connected to the plurality of connecting platforms 33. The outer periphery of the upper layer plate 31 is attached to the groove wall of the receiving groove 321 to close the receiving groove 321 and construct a pressure relief cavity 34. By providing the receiving groove 321 on the lower layer plate 32, on the one hand, it is convenient to place the plurality of connecting platforms 33, and on the other hand, it is convenient to construct the pressure relief cavity 34 with the upper layer plate 31 arranged in the receiving groove 321. In this embodiment, in order to facilitate determining the position of the connecting platform 33 in the receiving groove 321, a positioning hole 323 located in the receiving groove 321 is further provided on the lower layer plate 32, and the connecting platform 33 is fixedly connected in the positioning hole 323.

[0053] Furthermore, as Figure 5 shown, the lower layer plate 32 is further provided with a first connecting flange 322 surrounding the receiving groove 321, and the first connecting flange 322 is used for connecting with the box body shell 1. By providing the first connecting flange 322 on the lower layer plate 32, the contact area between the bottom protection plate 3 and the box body shell 1 is increased. On the one hand, it is convenient to connect the bottom protection plate 3 and the box body shell 1, and on the other hand, it ensures that there is sufficient connection strength between the box body shell 1 and the bottom protection plate 3 after connection. In this embodiment, the first connecting flange 322 can be fixedly connected to the box body shell 1 by welding, or can be detachably connected to the box body shell 1 by bolt connection.

[0054] Furthermore, the upper layer plate 31 has a first surface facing the battery 100, and the first connecting flange 322 has a second surface facing the box body shell 1. The first surface of the upper layer plate 31 located in the receiving groove 321 is lower than the second surface, so as to form a limiting groove on the bottom protection plate 3. A limiting protrusion is provided on one side of the box body shell 1 facing the bottom protection plate 3, and the limiting protrusion is inserted into the limiting groove. By forming the limiting groove on the bottom protection plate 3 and providing the limiting protrusion on the box body shell 1 and inserting the limiting protrusion into the limiting groove, the positioning between the box body shell 1 and the bottom protection plate 3 is realized, which not only makes the connection position between the two more accurate, but also improves the structural strength of the box body shell 1 and the bottom protection plate 3 after connection.

[0055] Optionally, as Figure 7 、 Figure 8As shown, the battery pack box also includes a fixing bracket 4, and the fixing bracket 4 is provided with a plurality of placement holes 41 for carrying the battery 100, and the placement holes 41 are connected with the pressure relief holes 311 in a one-to-one correspondence. By setting the fixing bracket 4 and providing the placement holes 41 on the fixing bracket 4, the battery 100 is fixed and limited, and the placement holes 41 correspond to the pressure relief holes 311 in a one-to-one correspondence, thereby ensuring that the explosion-proof valve of the battery 100 is aligned with the pressure relief holes 311. In this embodiment, the fixing bracket 4 is a plastic bracket, so it has a certain elasticity, so as to better be compatible with and protect the battery 100, and avoid the fixing bracket 4 being too hard and damaging the battery 100.

[0056] Furthermore, if Figure 8 As shown, the side of the fixed bracket 4 facing the upper plate 31 is provided with an insertion protrusion 42 arranged around the placement hole 41, and the insertion protrusion 42 is inserted into the pressure relief hole 311. By providing the insertion protrusion 42 arranged around the placement hole 41 on the side of the fixed bracket 4 facing the upper plate 31, the insertion protrusion 42 is inserted into the pressure relief hole 311 to limit the fixed bracket 4, thereby preventing relative displacement between the fixed bracket 4 and the upper plate 31, resulting in misalignment of the battery 100, and failure to align the explosion-proof valve with the pressure relief hole 311.

[0057] Alternatively, if Figure 4 As shown, the upper plate 31 is also provided with welding through holes 313 corresponding to the plurality of connecting platforms 33. By providing the welding through holes 313 corresponding to the connecting platforms 33 on the upper plate 31, it is convenient to weld the connecting platforms 33 and the upper plate 31, making the welding operation more convenient.

[0058] Alternatively, if Figure 6 As shown, the upper cover plate 2 is provided with a second connection flange 21 for connecting with the box shell 1. By providing the second connection flange 21 on the upper cover plate 2, it is convenient to connect the upper cover plate 2 with the box shell 1 on the one hand, and on the other hand, it is ensured that there is sufficient connection strength between the box shell 1 and the upper cover plate 2 after the connection. In this embodiment, the second connection flange 21 can be fixedly connected to the box shell 1 by welding, or can be detachably connected to the box shell 1 by bolt connection.

[0059] In this embodiment, a battery pack is also provided, which includes the above-mentioned battery pack box. The battery pack controls the thermal runaway gas by using the above-mentioned battery pack box, avoids the components in the battery pack from being damaged due to the impact of the thermal runaway gas, improves the protection of the internal components of the battery pack, and thus prolongs the service life of the battery pack.

[0060] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A battery pack box, characterized in that: The battery pack box comprises: A bottom guard plate (3), the bottom guard plate (3) comprising an upper plate (31), a lower plate (32) and a plurality of connection platforms (33), the plurality of connection platforms (33) being arranged at intervals between the upper plate (31) and the lower plate (32) to form a pressure relief cavity (34) between the upper plate (31) and the lower plate (32), the upper plate (31) being used to carry a plurality of batteries (100) and being provided with pressure relief holes (311) corresponding to explosion-proof valves on each battery (100), the pressure relief holes (311) being in communication with the pressure relief cavity (34); A box shell (1), the bottom guard plate (3) being connected to one side of the box shell (1), and a buffer chamber (11) communicating with the pressure relief chamber (34) being provided in the box shell (1); at least one pressure relief valve (5), wherein at least one of the pressure relief valves (5) is disposed on the housing (1) and is in communication with the buffer chamber (11); An upper cover plate (2), the upper cover plate (2) being connected to the other side of the box shell (1) and cooperating with the bottom guard plate (3) to form a receiving chamber for receiving a plurality of the batteries (100).

2. The battery pack case according to claim 1, characterized in that: The box shell (1) comprises four side panels connected end to end in sequence, each of the side panels is provided with a buffer chamber (11), the buffer chambers (11) in the four side panels are communicated with each other, and at least one pressure relief valve (5) is connected to any of the side panels and communicates with the corresponding buffer chamber (11).

3. The battery pack case according to claim 2, characterized in that: Each of the side plates is provided with a first pressure relief window (12) connected to the buffer chamber (11); the upper plate (31) is provided with a second pressure relief window (312) connected to the first pressure relief window (12) in a one-to-one correspondence; the second pressure relief window (312) is connected to the pressure relief chamber (34).

4. The battery pack case according to claim 3, characterized in that: The lower plate (32) is provided with a receiving groove (321), a plurality of connecting platforms (33) are arranged in the receiving groove (321), the upper plate (31) is connected to the plurality of connecting platforms (33), and the outer periphery of the upper plate (31) is fitted with the groove wall of the receiving groove (321) to close the receiving groove (321) and construct the pressure relief chamber (34).

5. The battery pack case according to claim 4, characterized in that: The lower plate (32) is also provided with a first connecting flange (322) surrounding the accommodating groove (321), and the first connecting flange (322) is used to be connected to the box shell (1).

6. The battery pack case according to claim 5, characterized in that: The upper plate (31) has a first surface facing the battery (100), the first connecting flange (322) has a second surface facing the box shell (1), the first surface of the upper plate (31) located in the accommodating groove (321) is lower than the second surface, so as to form a limiting groove on the bottom guard plate (3), and a limiting protrusion is provided on the side of the box shell (1) facing the bottom guard plate (3), and the limiting protrusion is inserted into the limiting groove.

7. The battery pack case according to claim 1, characterized in that: The battery pack box also includes a fixing bracket (4), the fixing bracket (4) is provided with a plurality of placement holes (41) for carrying the batteries (100), and the placement holes (41) are connected to the pressure relief holes (311) in a one-to-one correspondence.

8. The battery pack case according to claim 7, characterized in that: An insertion protrusion (42) arranged around the placement hole (41) is provided on one side of the fixing bracket (4) facing the upper plate (31), and the insertion protrusion (42) is inserted into the pressure relief hole (311).

9. The battery pack case according to claim 1, characterized in that: The upper plate (31) is also provided with welding through holes (313) corresponding one-to-one to the plurality of connecting platforms (33).

10. The battery pack case according to claim 1, characterized in that: The upper cover plate (2) is provided with a second connecting flange (21) for connecting with the box shell (1).

11. A battery pack, characterized in that: The battery pack comprises a battery pack case as described in any one of claims 1-10.

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