Battery pack case and battery pack

Abstract

A battery pack case and a battery pack. The battery pack case comprises a case housing (1), an upper cover plate (2), a bottom protective plate (3) and at least one pressure relief valve (5), wherein the bottom protective plate (3) is internally provided with a pressure relief cavity (34), which is formed by an upper plate (31), a lower plate (32) and a plurality of connecting platforms (33), the upper plate (31) being further provided with a pressure relief hole (311) in communication with the pressure relief cavity (34); the case housing (1) is internally provided with a buffer cavity (11) in communication with the pressure relief cavity (34); and the pressure relief valve (5) is arranged on the case housing (1) and is in communication with the buffer cavity (11).

Description

Battery pack box and battery pack

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on July 24, 2024, with application number 202421766136.9. The entire contents of the above application are incorporated by reference into this application.

[0002] Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery pack case and a battery pack.

[0004] Background Art

[0005] With the increasing demand for energy supply, in order to improve power supply efficiency, multiple batteries are often combined and energy is supplied in the form of a battery pack. After long-term use, the temperature of the single battery 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, an explosion-proof valve is installed on the single battery. When the pressure inside the battery is too high, the thermal runaway gas breaks through the explosion-proof valve, thereby achieving the purpose of pressure relief protection inside the battery.

[0006] Technical issues

[0007] 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.

[0008] Technical Solutions

[0009] In a first aspect, an embodiment of the present application provides a battery pack case, the battery pack case comprising:

[0010] A bottom guard plate, the bottom guard plate comprising an upper plate, a lower plate, and a plurality of connection platforms, wherein the plurality of connection platforms are spaced between the upper plate and the lower plate to form a pressure relief cavity between the upper plate and the lower plate, the upper plate being configured to carry a plurality of batteries and having a pressure relief hole corresponding to an explosion-proof valve on each battery, the pressure relief hole being in communication with the pressure relief cavity;

[0011] 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;

[0012] at least one pressure relief valve, at least one of the pressure relief valves being provided on the housing and communicating with the buffer chamber;

[0013] An upper cover plate is connected to the other side of the box shell and cooperates with the bottom guard plate to form a accommodating chamber for accommodating a plurality of the batteries.

[0014] In a second aspect, an embodiment of the present application provides a battery pack, comprising a battery pack case as described in any one of the above items.

[0015] Beneficial effects

[0016] The present application provides a battery pack case, which forms a pressure relief chamber connected to the pressure relief hole on the upper plate by arranging multiple connecting platforms between the upper plate and the lower plate, a buffer chamber connected to the pressure relief chamber is arranged on the case shell, and at least one pressure relief valve connected to the buffer chamber is arranged on the case shell, so that the thermal runaway gas in the battery breaks through the explosion-proof valve and enters the pressure relief chamber and the buffer chamber in turn through the pressure relief hole, and is finally discharged through the pressure relief valve connected to the case shell. On the one hand, the pressurized gas inside the battery can be released, and on the other hand, the pressure relief path of the thermal runaway gas can be limited to prevent the thermal runaway gas from running around and damaging internal devices, thereby having better protection and higher safety.

[0017] The present application also provides a battery pack, which controls thermal runaway gas by applying the above-mentioned battery pack case, thereby preventing components inside the battery pack from being damaged due to the impact of thermal runaway gas, improving the protection of internal components of the battery pack, and thus extending the service life of the battery pack.

[0018] BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 is a structural exploded view of the battery pack provided in this application;

[0020] FIG2 is a cross-sectional view of a battery pack provided by the present application;

[0021] FIG3 is a structural exploded view of the bottom guard plate of the battery pack box provided in this application;

[0022] FIG4 is a schematic structural diagram of an upper plate constituting a bottom guard plate in a battery pack box provided in the present application;

[0023] FIG5 is a schematic structural diagram of the lower plate constituting the bottom guard plate in the battery pack box provided in the present application;

[0024] FIG6 is a schematic structural diagram of the upper cover plate in the battery pack box provided by the present application;

[0025] FIG7 is a schematic structural diagram of a fixing bracket in a battery pack box provided in the present application;

[0026] FIG8 is a cross-sectional view along the AA direction of FIG7 .

[0027] In the picture:

[0028] 100. Battery;

[0029] 1. Box shell; 11. Buffer chamber; 12. First pressure relief window; 13. Side panel; 14. Limiting protrusion;

[0030] 2. Upper cover; 21. Second connecting flange;

[0031] 3. Bottom guard plate; 31. Upper plate; 311. Pressure relief hole; 312. Second pressure relief window; 313. Welding hole; 32. Lower plate; 321. Accommodation groove; 322. First connecting flange; 323. Positioning hole; 33. Connecting platform; 34. Pressure relief chamber; 35. Limiting groove;

[0032] 4. Fixing bracket; 41. Placement hole; 42. Insertion protrusion;

[0033] 5. Pressure relief valve.

[0034] Modes for Carrying Out the Invention

[0035] 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.

[0036] As shown in Figures 1 to 8, 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 multiple connecting platforms 33. The multiple 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 configured to carry multiple 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 multiple batteries 100.

[0037] By arranging multiple connecting platforms 33 between the upper plate 31 and the lower plate 32, a pressure relief chamber 34 connected to the pressure relief hole 311 on the upper plate 31 is formed between the upper plate 31 and the lower plate 32, a buffer chamber 11 connected to the pressure relief chamber 34 is arranged on the box shell 1, and at least one pressure relief valve 5 connected to the buffer chamber 11 is arranged on the box shell 1, so that the thermal runaway gas in the battery 100 breaks through the explosion-proof valve and enters the pressure relief chamber 34 and the buffer chamber 11 in turn through the pressure relief hole 311, and is finally discharged through the pressure relief valve 5 connected to the box shell 1. On the one hand, the pressurized gas inside the battery 100 can be released, and on the other hand, the pressure relief path of the thermal runaway gas is limited to prevent the thermal runaway gas from running around and damaging internal devices, thereby having better protection and higher safety.

[0038] The battery pack case can be configured to store various types of batteries 100. In this embodiment, it is primarily configured to store large cylindrical batteries. Both the upper plate 31 and the lower plate 32 are constructed of sheet metal. When assembling the bottom guard plate 3, the multiple connecting bosses 33 are first welded to the lower plate 32 at designated locations. The upper plate 31 is then welded to the multiple connecting bosses 33, thereby integrating the lower plate 32, connecting bosses 33, and upper plate 31 into a single unit. This improves the structural strength of the bottom guard plate 3.

[0039] As shown in FIG2 , the housing 1 includes four side panels 13 connected end to end. Each side panel 13 has a buffer chamber 11 disposed therein. The buffer chambers 11 within the four side panels 13 are interconnected. At least one pressure relief valve 5 is connected to each side panel 13 and communicates with its corresponding buffer chamber 11. By providing interconnected buffer chambers 11 within the side panels 13 constituting the housing 1, the volume of the buffer chambers 11 is increased, providing a stronger buffering capacity.

[0040] As shown in Figures 2 and 4, each side panel 13 is provided with a first pressure relief window 12 that is connected to the buffer chamber 11, and the upper panel 31 is provided with a second pressure relief window 312 that is connected to the first pressure relief window 12 in a one-to-one correspondence, and the second pressure relief window 312 is connected to the pressure relief chamber 34. By providing the first pressure relief window 12 that is connected to the buffer chamber 11 on the side panel 13 and providing the second pressure relief window 321 on the upper panel 31, the pressure relief chamber 34 is connected to the buffer chamber 11. In this embodiment, each side panel 13 is provided with a first pressure relief window 12, so four second pressure relief windows 312 are provided on the upper panel 31 in a one-to-one correspondence. This accelerates the speed at which the thermal runaway gas flows from the pressure relief chamber 34 into the buffer chamber 11.

[0041] As shown in Figures 3 and 5, the lower plate 32 is provided with a receiving groove 321, and a plurality of connecting platforms 33 are provided in the receiving groove 321. The upper plate 31 is connected to the plurality of connecting platforms 33. The outer periphery of the upper plate 31 is in contact with the groove wall of the receiving groove 321 to close the receiving groove 321 and construct a pressure relief chamber 34. By providing the receiving groove 321 on the lower plate 32, on the one hand, it is convenient to place a plurality of connecting platforms 33, and on the other hand, it is convenient to construct a pressure relief chamber 34 with the upper plate 31 provided in the receiving groove 321. In this embodiment, in order to facilitate determination of 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 plate 32, and the connecting platform 33 is fixedly connected in the positioning hole 323.

[0042] As shown in Figure 5, the lower plate 32 further includes a first connecting flange 322 surrounding the receiving groove 321. The first connecting flange 322 is configured to connect to the outer shell 1. Providing the first connecting flange 322 on the lower plate 32 increases the contact area between the bottom guard plate 3 and the outer shell 1. This not only facilitates connection between the bottom guard plate 3 and the outer shell 1, but also ensures sufficient connection strength between the outer shell 1 and the bottom guard plate 3 after connection. In this embodiment, the first connecting flange 322 can be fixedly connected to the outer shell 1 by welding, or it can be removably connected to the outer shell 1 by bolting.

[0043] As shown in Figures 1 to 4, the upper plate 31 has a first surface facing the battery 100, and the first connecting flange 322 has a second surface facing the box shell 1. The level of the first surface of the upper plate 31 located in the accommodating groove 321 is lower than the level of the second surface, so as to form a limiting groove 35 on the bottom guard plate 3. A limiting protrusion 14 is provided on the side of the box shell 1 facing the bottom guard plate 3, and the limiting protrusion 14 is inserted into the limiting groove 35. By forming the limiting groove 35 on the bottom guard plate 3, providing the limiting protrusion 14 on the box shell 1, and inserting the limiting protrusion 14 into the limiting groove 35, the box shell 1 and the bottom guard plate 3 are positioned, which not only makes the connection position between the two more accurate, but also improves the structural strength of the box shell 1 and the bottom guard plate 3 after connection.

[0044] As shown in Figures 7 and 8, the battery pack case also includes a fixing bracket 4, which is provided with a plurality of placement holes 41 configured to carry the battery 100, and the placement holes 41 are connected to the pressure relief holes 311 in a one-to-one correspondence. By providing 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, which has a certain degree of elasticity, thereby better compatibility and protection with the battery 100, and avoiding the fixing bracket 4 being made of too hard a material and damaging the battery 100.

[0045] As shown in FIG8 , the side of the fixing bracket 4 facing the upper plate 31 is provided with an insertion protrusion 42 surrounding the receiving hole 41. The insertion protrusion 42 is inserted into the pressure relief hole 311. By providing the insertion protrusion 42 surrounding the receiving hole 41 on the side of the fixing bracket 4 facing the upper plate 31, the insertion protrusion 42 is inserted into the pressure relief hole 311 to limit the position of the fixing bracket 4, preventing relative movement between the fixing bracket 4 and the upper plate 31, which could cause misalignment of the battery 100 and prevent the explosion-proof valve from being aligned with the pressure relief hole 311.

[0046] As shown in Figure 4, the upper plate 31 is further provided with welding holes 313 corresponding one-to-one to the plurality of connection platforms 33. By providing the welding holes 313 corresponding one-to-one to the connection platforms 33 on the upper plate 31, welding of the connection platforms 33 to the upper plate 31 is facilitated, making the welding operation more convenient.

[0047] As shown in Figure 6, the upper cover plate 2 is provided with a second connecting flange 21 configured to connect to the housing 1. Providing the second connecting flange 21 on the upper cover plate 2 facilitates connection between the upper cover plate 2 and the housing 1 while also ensuring sufficient connection strength between the housing 1 and the upper cover plate 2 after connection. In this embodiment, the second connecting flange 21 can be fixedly connected to the housing 1 by welding or removably connected to the housing 1 by bolting.

[0048] In this embodiment, a battery pack is also provided, comprising the aforementioned battery pack case. By utilizing the aforementioned battery pack case, the battery pack controls thermal runaway gases, preventing damage to components within the battery pack due to the impact of thermal runaway gases, improving the protection of internal components of the battery pack and thereby extending the battery pack's service life.

Claims

1. Battery pack box, including: 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 configured to carry a plurality of batteries (100) and having a pressure relief hole (311) corresponding to an explosion-proof valve on each battery (100), the pressure relief hole (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, wherein: The box shell (1) comprises four side plates (13) connected end to end in sequence, each of the side plates (13) is provided with the buffer chamber (11), the buffer chambers (11) in the four side plates (13) are communicated with each other, and at least one pressure relief valve (5) is connected to any of the side plates (13) and is communicated with the corresponding buffer chamber (11).

3. The battery pack case according to claim 2, wherein: Each of the side plates (13) is provided with a first pressure relief window (12) in communication with the buffer chamber (11); the upper plate (31) is provided with a second pressure relief window (312) in communication with the first pressure relief window (12) in a one-to-one correspondence; the second pressure relief window (312) is in communication with the pressure relief chamber (34).

4. The battery pack case according to claim 3, wherein: 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, wherein: 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 configured to be connected to the box shell (1).

6. The battery pack case according to claim 5, wherein: 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 horizontal height of the first surface of the upper plate (31) located in the accommodating groove (321) is lower than the horizontal height of the second surface, so as to form a limiting groove (35) on the bottom guard plate (3), and a limiting protrusion (14) is provided on the side of the box shell (1) facing the bottom guard plate (3), and the limiting protrusion (14) is inserted into the limiting groove (35).

7. The battery pack case according to claim 1 further comprises a fixing bracket (4), wherein the fixing bracket (4) is provided with a plurality of placement holes (41) configured to carry the battery (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, wherein: 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, wherein: 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, wherein: The upper cover plate (2) is provided with a second connecting flange (21) configured to be connected to the box shell (1).

11. A battery pack, comprising the battery pack case as claimed in any one of claims 1 to 10.

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