Battery pack

Abstract

The utility model provides a battery pack, which comprises a box body, a battery pack and a battery pack cover, the battery cell is arranged in the accommodating cavity, and an anti-explosion valve is arranged on the battery cell; and the tray is fixed in the box body, the battery cell is supported on the tray, the tray comprises a main plate and a channel plate, the channel plate is opposite to the anti-explosion valve in the vertical direction, and the channel plate is configured to be separated from the main plate when the battery cell is in thermal runaway. According to the battery pack disclosed by the utility model, the separable channel plate is arranged on the tray, and the channel plate is separated from the main plate, so that the circulation cross section of gas can be increased, the circulation speed of high-temperature gas can be ensured, the use safety of the battery pack can be ensured, meanwhile, the thermoelectric arcing phenomenon can be avoided, and the safety of the whole pack can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery pack manufacturing technology, and in particular to a battery pack. Background Technology

[0002] In existing battery pack solutions, when the battery cells experience thermal runaway, the high-temperature gas released by the explosion-proof valve can only flow along the exhaust channel. When the explosion-proof valve releases a large amount of high-temperature gas instantaneously, the high-temperature gas cannot be discharged quickly due to the limited cross-sectional area of ​​the exhaust channel, which is detrimental to improving the safety performance of the battery pack. Utility Model Content

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, the present invention provides a battery pack that can improve safety performance.

[0004] A battery pack according to an embodiment of the present invention includes: a housing with a receiving cavity formed therein; a battery cell disposed in the receiving cavity and equipped with an explosion-proof valve; and a tray fixed in the housing with the battery cell supported on the tray. The tray includes a main board and a channel board, the channel board being directly opposite the explosion-proof valve in the vertical direction, and the channel board being configured to separate from the main board in the event of thermal runaway of the battery cell.

[0005] According to the present invention, a detachable channel plate is provided on the tray. The channel plate is separate from the main board, which can increase the gas flow cross section, thereby ensuring the flow speed of high-temperature gas and ensuring the safety of the battery pack. At the same time, it can also avoid thermoelectric arcing, thus ensuring the safety of the entire pack.

[0006] According to some embodiments of the present invention, the motherboard is arranged perpendicular to the vertical direction, and a connection port is formed on the motherboard. The connection port penetrates the motherboard along the thickness direction. The tray further includes a connecting plate, which is disposed at the connection port and is connected to the channel plate and the end edge of the connection port respectively.

[0007] According to some optional embodiments of the present invention, the motherboard is a rectangular plate, and the motherboard is provided with a plurality of connection ports. The connection ports extend along a first direction, and the plurality of connection ports are arranged at intervals along a second direction. The first direction intersects the second direction, and a connection port is defined between every two connection plates. There are a plurality of channel plates, and each channel plate corresponds to a connection port.

[0008] According to some embodiments of the present invention, a groove is formed on the end edge of the connecting plate facing the channel plate. The groove is recessed from the side surface of the connecting plate away from the battery cell and facing the battery cell. The two end edges of the channel plate in the first direction abut against the bottom wall of the groove.

[0009] According to some optional embodiments of the present invention, the channel plate is welded or bonded to the connecting plate.

[0010] According to some embodiments of the present invention, the connecting plate has a guide slope on the side surface facing the battery cell, and the guide slope extends obliquely away from the battery cell in the direction from the main board to the channel plate.

[0011] According to some embodiments of the present invention, the tray includes: a first plate, which is arranged horizontally perpendicular to the up-down direction; a second plate, which is disposed on the side of the first plate facing the battery cell; and a support plate, which is connected between the first plate and the second plate.

[0012] According to some optional embodiments of the present invention, a first exhaust channel is defined between the support plate and the first plate and the second plate, and the first exhaust channel is connected to the gas channel of the housing.

[0013] According to some embodiments of the present invention, the battery pack includes: a base plate, which covers the bottom of the housing and is located on the side of the tray away from the battery cell; a second exhaust channel is formed in the base plate, and the second exhaust channel is connected to the gas channel of the housing.

[0014] According to some optional embodiments of the present invention, the base plate is provided with reinforcing ribs, and the reinforcing ribs protrude away from the battery cell along the thickness direction of the base plate.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a battery pack according to an embodiment of the present utility model;

[0017] Figure 2 It is along Figure 1 Sectional view of line AA in the middle;

[0018] Figure 3 yes Figure 2 A partial enlarged view of point B in the middle;

[0019] Figure 4 yes Figure 1The exploded view of the battery pack shown;

[0020] Figure 5 yes Figure 4 A schematic diagram of the base plate shown.

[0021] Figure label:

[0022] 100. Battery pack;

[0023] 10. Box body;

[0024] 20. Battery cell; 21. Explosion-proof valve;

[0025] 30. Tray; 31. Main board; 311. Connecting port; 32. Channel plate; 33. Connecting plate; 331. Groove; 332. Guide slope;

[0026] 301. First plate; 302. Second plate; 303. Support plate; 304. First exhaust channel;

[0027] 40. Base plate; 41. Second exhaust channel; 42. Reinforcing ribs;

[0028] 50. Liquid cooling plate;

[0029] 60. Longitudinal beam. Detailed Implementation

[0030] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0031] The following is a reference appendix. Figure 1-5 A battery pack 100 according to an embodiment of the present utility model is described.

[0032] Reference Figure 1 , Figure 2 and Figure 3 According to an embodiment of the present invention, a battery pack 100 includes: a housing 10, a battery cell 20, and a tray 30. Specifically, a receiving cavity is formed inside the housing 10; the battery cell 20 is disposed in the receiving cavity, and an explosion-proof valve 21 is provided on the battery cell 20; the tray 30 is fixed inside the housing 10, and the battery cell 20 is supported on the tray 30. The tray 30 includes a main board 31 and a channel plate 32. The channel plate 32 and the explosion-proof valve 21 are directly opposite each other in the vertical direction. The channel plate 32 is configured to separate from the main board 31 when the battery cell 20 experiences thermal runaway.

[0033] For example, Figure 1 , Figure 2 and Figure 3As shown, a receiving cavity is formed inside the housing 10, and the battery cell 20 is disposed within the receiving cavity. An explosion-proof valve 21 is formed on the lower side of the battery cell 20. A tray 30 is disposed inside the housing 10, with the battery cell 20 disposed on the upper side of the tray 30. The channel plate 32 of the tray 30 is located below the explosion-proof valve 21. Preferably, the tray 30 is welded to the housing 10, which ensures the connection strength between the tray 30 and the housing 10.

[0034] When the battery cell 20 is running, it is easy for the battery cell 20 to thermal runaway due to prolonged use. The battery cell 20 will release high-temperature gas from the explosion-proof valve 21. The high-temperature gas is sprayed onto the channel plate 32, causing the channel plate 32 to separate from the main board 31. At this time, the high-temperature gas can escape from the space between the channel plate 32 and the main board 31, thereby accelerating the release of the high-temperature gas.

[0035] The battery pack 100 of this utility model has a separable channel plate 32 on the tray 30. The high-temperature gas released by the thermal runaway of the battery cell 20 can directly separate the channel plate 32 from the main board 31, thereby increasing the gas flow cross section and ensuring the flow speed of the high-temperature gas, ensuring the safe use of the battery pack 100 and improving the safety performance of the battery pack 100. At the same time, the high-temperature gas released by the battery cell 20 is discharged through a dedicated channel, thereby isolating the high-temperature gas from electricity and avoiding phenomena such as electrical arcing caused by heat, thus ensuring the safety of the entire pack.

[0036] In addition, when the battery cell 20 is running normally, the main board 31 and the channel board 32 work together to ensure the rigidity of the tray 30, thereby ensuring that the tray 30 can provide stable support for the battery cell 20 and effectively prevent the battery cell 20 from shaking in the receiving cavity.

[0037] According to an embodiment of the present invention, the battery pack 100 has a separable channel plate 32 on the tray 30. The channel plate 32 is separate from the main board 31, which can increase the gas flow cross section, thereby ensuring the flow speed of high-temperature gas and ensuring the safe use of the battery pack 100. At the same time, it can also avoid thermoelectric arcing, thereby ensuring the safety of the entire pack.

[0038] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The motherboard 31 is arranged perpendicular to the vertical direction, and a connection port 311 is formed on the motherboard 31. The connection port 311 is along the thickness direction of the motherboard 31 (e.g., Figure 2 The mainboard 31 shown (vertical direction) runs through the mainboard 31. The tray 30 may also include a connecting plate 33, which is located at the connection port 311. The connecting plate 33 is connected to the end edge of the channel plate 32 and the connection port 311 respectively.

[0039] In this way, the connection board 33 can be set up to facilitate the connection between the channel board 32 and the connection board 33, thereby avoiding the channel board 32 being directly connected to the motherboard 31, which would prevent the channel board 32 from being unable to be properly separated from the motherboard 31. This can ensure the safety performance of the battery pack 100. At the same time, the connection port 311 is set in a reasonable position, which can facilitate the arrangement of the connection board 33, and thus facilitate the arrangement of the channel board 32.

[0040] For example, Figure 2 and Figure 3 As shown, the motherboard 31 is arranged horizontally, the connection port 311 runs through the motherboard 31 in the vertical direction, the connection plate 33 is located at the connection port 311, one end of the connection plate 33 is connected to the motherboard 31, and the other end of the connection plate 33 is connected to the channel plate 32.

[0041] According to some optional embodiments of the present invention, refer to Figure 2 , Figure 3 and Figure 4 The motherboard 31 is a rectangular board, and it has multiple connection ports 311. That is, the motherboard 31 can have two, three, four, or more connection ports 311. The connection ports 311 are located along a first direction (e.g., Figure 4 Extending in the front-to-back direction (as shown), multiple connection ports 311 extend along the second direction (e.g., in the front-to-back direction). Figure 4 The connecting plates 33 are arranged at intervals in the left and right directions shown. The first direction intersects with the second direction. A connection port 311 is defined between every two connecting plates 33. There are multiple channel plates 32, and each channel plate 32 corresponds to a connection port 311.

[0042] In this way, multiple connection ports 311 can be set up to arrange multiple channel plates 32, thereby ensuring that the tray 30 has multiple pressure relief channels, which in turn ensures the safety of the battery pack 100. At the same time, when the explosion-proof valve 21 of a certain cell 20 is thermally runaway while the explosion-proof valve 21 of the adjacent connection port 311 is not runaway, the channel plate 32 can block the high-temperature gas, thereby preventing the thermal runaway of the battery pack 100 from being further aggravated.

[0043] For example, Figure 2 and Figure 3 As shown, the motherboard 31 has four connection ports 311, which extend in the front-to-back direction and are arranged at intervals in the left-to-right direction. There are four channel boards 32, and a connection board 33 is provided at each connection port 311. Both ends of the channel board 32 are connected to the motherboard 31 through the connection board 33.

[0044] According to some embodiments of this utility model, refer to Figure 2 and Figure 3A groove 331 is formed on the end edge of the connecting plate 33 facing the channel plate 32. The groove 331 extends from the surface of the connecting plate 33 away from the side of the battery cell 20 (e.g., Figure 3 The lower surface of the connecting plate 33 shown is recessed towards the cell 20, and the channel plate 32 is formed in the first direction (e.g., Figure 3 The two ends of the groove 331 (shown in the left and right directions) abut against the bottom wall of the groove 331.

[0045] In this way, the groove 331 provides an installation position for the channel plate 32, which facilitates the arrangement of the channel plate 32. At the same time, the channel plate 32 is connected to the bottom wall of the groove 331, which reduces the distance between the channel plate 32 and the connecting plate 33, making it easier to fix the channel plate 32 and the connecting plate 33. Furthermore, it can reduce the thickness of the support plate, providing more space for other structures.

[0046] For example, such as Figure 3 As shown, taking the left connecting plate 33 as an example, a groove 331 is formed at the right end of the left connecting plate 33. The groove 331 is recessed upward from the lower surface of the connecting plate 33. The left end of the channel plate 32 abuts against the bottom wall of the groove 331. The right connecting plate 33 is symmetrically arranged with the left connecting plate 33 in the left-right direction. The right end of the channel plate 32 abuts against the bottom wall of the groove 331 of the right connecting plate 33.

[0047] According to some optional embodiments of the present invention, refer to Figure 2 and Figure 3 The channel plate 32 is welded or bonded to the main board 31. This connection method ensures both the strength of the connection between the channel plate 32 and the connecting plate 33, and also allows for normal separation between them.

[0048] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The side surface of the connecting plate 33 facing the cell 20 (e.g.) Figure 3 The upper surface of the connecting plate 33 shown is provided with a guide slope 332, which extends obliquely away from the battery cell 20 in the direction from the main board 31 toward the channel plate 32. Thus, the guide slope 332 can guide the high-temperature gas to flow from the space between the main board 31 and the channel plate 32, thereby reducing the resistance to the flow of high-temperature gas and accelerating the flow speed of high-temperature gas.

[0049] For example, such as Figure 2 and Figure 3As shown, a guide slope 332 is provided on the upper surface of the connecting plate 33. The guide slope extends downward in the direction from the main plate 31 toward the channel plate 32. Preferably, the angle between the guide slope 332 and the horizontal direction is 10°-30°. The reasonable setting of the inclination angle of the guide slope can reduce the flow resistance of high-temperature gas and guide the flow direction of high-temperature gas normally.

[0050] According to some embodiments of this utility model, refer to Figure 2 and Figure 3 The tray 30 includes a first plate 301, a second plate 302, and a support plate 303. The first plate 301 is arranged horizontally perpendicular to the vertical direction; the second plate 302 is located on the side of the first plate 301 facing the battery cell 20 (e.g., ...). Figure 2 (The upper side of the first plate 301 shown); the support plate 303 is connected between the first plate 301 and the second plate 302.

[0051] In this way, the first plate 301 and the second plate 302 work together to strengthen the strength of the tray 30 and effectively prevent the tray 30 from deforming and breaking. At the same time, the support plate 303 can strengthen the connection between the first plate 301 and the second plate 302 and can provide support for the first plate 301 and the second plate 302 in the thickness direction of the tray 30, thereby further strengthening the strength of the tray 30. Furthermore, the support plate 303 can also bear the vibration force transmitted from the vehicle to the battery pack 100, thereby reducing the swaying amplitude of the battery pack 100 and effectively improving the buffering performance of the tray 30.

[0052] For example, such as Figure 2 and Figure 3 As shown, the first plate 301 is arranged horizontally, the second plate 302 is located above the first plate 301, and the support plate 303 is arranged vertically. The lower end of the support plate 303 is connected to the first plate 301, and the upper end of the support plate 303 is connected to the second plate 302. Preferably, the pallet 30 is a sheet metal part, which can ensure the strength of the pallet 30. The support plate 303 is arranged at an angle of 30°-85° with the horizontal direction, which can prevent the support plate 303 from being damaged by excessive supporting force.

[0053] Furthermore, if Figure 2 and Figure 3 As shown, a longitudinal beam 60 is provided on the upper surface of the tray 30. The longitudinal beam 60 extends in the front-to-back direction, and both ends of the longitudinal beam 60 are connected to the housing 10. This strengthens the connection point between the tray 30 and the housing 10, effectively preventing the tray 30 from separating from the housing 10. Simultaneously, it provides support in the front-to-back direction of the housing 10, thereby effectively improving the strength of the housing 10. Furthermore, the longitudinal beam 60 can divide the space of the receiving cavity, thereby improving the rationality of the arrangement of the battery cells 20.

[0054] According to some optional embodiments of the present invention, refer to Figure 3 and Figure 4 A first exhaust channel 304 is defined between the support plate 303, the first plate 301, and the second plate 302, and the first exhaust channel 304 is connected to the gas channel of the housing 10. Therefore, when the channel plate 32 is not separated from the main board 31, i.e., when the battery cell 20 only leaks and releases a small amount of high-temperature gas, the gas can be directly discharged into the gas channel through the first exhaust channel 304. This ensures the safety of the battery pack 100, reduces damage to the battery pack 100, and lowers maintenance costs.

[0055] According to some embodiments of this utility model, refer to Figure 4 and Figure 5 The battery pack 100 includes: a base plate 40, which covers the bottom of the housing 10 and is located on the side of the tray 30 opposite to the battery cell 20 (e.g., Figure 4 The bottom plate 40 (shown on the lower side of the tray 30) has a second exhaust channel 41 formed therein, which is connected to the gas channel of the box 10.

[0056] In this way, when the explosion-proof valve 21 of the cell 20 releases a large amount of high-temperature gas, the high-temperature gas separates the channel plate 32 from the main board 31. After passing through the connection port 311, the high-temperature gas is discharged from the second exhaust channel 41 to the gas channel, thereby ensuring the flow cross section of the high-temperature gas, increasing the exhaust speed, and thus preventing the thermal runaway of the battery pack 100 from worsening.

[0057] For example, such as Figure 4 and Figure 5 As shown, the bottom plate 40 is located at the bottom of the box 10 and is located below the tray 30. A second exhaust channel 41 is formed inside the bottom plate 40, and the second exhaust channel 41 is connected to the gas channel inside the box 10.

[0058] According to some embodiments of this utility model, refer to Figure 5 The base plate 40 is provided with reinforcing ribs 42, which are arranged along the thickness direction of the base plate 40 (e.g., ...). Figure 5 The reinforcing rib 42 protrudes away from the battery cell 20 in the vertical direction shown. Therefore, the reinforcing rib 42 can strengthen the base plate 40, thereby preventing damage to the base plate 40. At the same time, the space between the reinforcing rib 42 and the tray 30 can act as an energy absorption box, thereby ensuring the protective effect of the base plate 40 on the bottom of the battery pack 100 and effectively preventing damage to the battery pack 100.

[0059] Furthermore, an elastic support is provided between the base plate 40 and the tray 30. The elastic support can absorb the vibration force transmitted from the vehicle to the battery pack 100, thereby reducing the swaying amplitude of the battery cell 20 within the housing 10 and enhancing the safety performance of the battery pack 100. Preferably, the elastic support can be made of foam or rubber, which ensures the shock absorption effect of the elastic support. At the same time, foam or rubber is inexpensive and easy to use in mass production.

[0060] Furthermore, such as Figure 4 and Figure 5 As shown, a liquid cooling plate 50 is provided on the top of the housing 10. The liquid cooling plate 50 has functions such as cooling and equalizing the temperature of the battery cell 20 and providing support. At the same time, the liquid cooling plate 50 can be bonded to the battery cell 20 by thermally conductive structural adhesive. The adhesive of the liquid cooling plate 50 can provide thermal conductivity and connection. The liquid cooling plate 50 is bolted to the housing 10, thereby preventing the liquid cooling plate 50 from separating from the housing 10.

[0061] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0063] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A battery pack, characterized in that, include: The box has a receiving cavity formed inside it; A battery cell, wherein the battery cell is disposed within the receiving cavity, and an explosion-proof valve is provided on the battery cell; The tray is fixed inside the housing, and the battery cell is supported on the tray. The tray includes a main board and a channel board. The channel board is directly opposite the explosion-proof valve in the vertical direction. The channel board is configured to separate from the main board in the event of thermal runaway of the battery cell.

2. The battery pack according to claim 1, characterized in that, The motherboard is arranged perpendicular to the vertical direction, and a connection port is formed on the motherboard, which penetrates the motherboard along its thickness direction. The tray further includes a connecting plate, which is disposed at the connection port and is connected to the end edge of the channel plate and the connection port, respectively.

3. The battery pack according to claim 2, characterized in that, The motherboard is a rectangular board with multiple connection ports extending along a first direction and spaced apart along a second direction. The first and second directions intersect. The connection port is defined between every two connecting plates. There are multiple channel plates, and each channel plate corresponds to a connection port.

4. The battery pack according to claim 2, characterized in that, A groove is formed on the end edge of the connecting plate facing the channel plate. The groove is recessed from the side surface of the connecting plate away from the battery cell and toward the battery cell. The two end edges of the channel plate in the first direction abut against the bottom wall of the groove.

5. The battery pack according to claim 4, characterized in that, The channel plate is welded or bonded to the connecting plate.

6. The battery pack according to claim 4, characterized in that, The connecting plate has a guide slope on the side surface facing the battery cell, and the guide slope extends obliquely away from the battery cell in the direction from the main board to the channel plate.

7. The battery pack according to claim 2, characterized in that, The tray includes: The first plate is arranged horizontally perpendicular to the vertical direction; The second plate is disposed on the side of the first plate facing the battery cell; A support plate, which is connected between the first plate and the second plate.

8. The battery pack according to claim 7, characterized in that, The support plate defines a first exhaust channel between itself and the first plate and the second plate, and the first exhaust channel is connected to the gas channel of the housing.

9. The battery pack according to claim 1, characterized in that, include: A base plate is provided, which covers the bottom of the housing and is located on the side of the tray away from the battery cell. A second exhaust channel is formed in the base plate, and the second exhaust channel is connected to the gas channel of the housing.

10. The battery pack according to claim 9, characterized in that, The base plate is provided with reinforcing ribs, which protrude away from the battery cell along the thickness direction of the base plate.

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