Battery pack and electric device

Abstract

The utility model discloses a kind of battery pack and electrical equipment, battery pack includes: tray, tray is equipped with drain groove, and tray is equipped with containing cavity;Battery cell group, battery cell group includes multiple electric cores and is contained in containing cavity by being electrically connected with each other;Flow guide, flow guide forms flow path between electric core and drain groove. According to the battery pack designed in the utility model, by setting flow guide to form flow path between electric core and drain groove, when electric core thermal runaway or liquid leakage, electrolyte is guided to drain groove and discharged, and isolation is formed with electric core, prevent electrolyte from leading to arc fire by guiding tray and electric core, improve the safety and service life of battery pack.

Description

Technical Field

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

[0002] In related technologies, battery devices have cell packs, which include multiple cells. The terminals of the multiple cells are electrically connected by connecting pieces. However, when a cell experiences thermal runaway or leakage, the electrolyte inside the cell is sprayed out from the explosion-proof valve, which can easily conduct through the tray and connecting pieces, leading to arcing and fire. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a battery pack. According to the battery pack designed according to this invention, a flow guide is provided to form a flow path between the battery cell and the drain tank. In the event of thermal runaway or leakage of the battery cell, the electrolyte is guided to the drain tank for discharge, isolating it from the battery cell and preventing the electrolyte from flowing through the tray and battery cell, thus preventing arcing and fire.

[0004] The battery pack according to this utility model includes:

[0005] The tray is provided with a drain groove and a receiving cavity inside the tray;

[0006] A battery cell assembly, the battery cell assembly comprising a plurality of electrically connected battery cells and housed within the receiving cavity;

[0007] A flow guide forms a flow path between the battery cell and the drain tank.

[0008] According to the present invention, the battery pack forms a flow path between the battery cell and the drain tank by setting a flow guide. In the event of thermal runaway or leakage of the battery cell, the electrolyte is guided to the drain tank for discharge, thus isolating it from the battery cell and preventing the electrolyte from flowing through the tray and the battery cell, which could lead to arcing and fire. This improves the safety and service life of the battery pack.

[0009] According to some embodiments of the present invention, the battery cell is provided with an explosion-proof valve, and the flow guide forms the flow path between the explosion-proof valve and the discharge tank.

[0010] According to some embodiments of the present invention, a plurality of battery cells are arranged along a first direction, and at least one end of each battery cell along a second direction is provided with the explosion-proof valve. The flow guide includes a flow guide plate. Along the height direction of the tray, one end of the flow guide plate is located below the explosion-proof valve, and the other end of the flow guide plate is located in the drain groove, so as to form the flow guide path between the explosion-proof valve and the drain groove. The first direction, the second direction, and the height direction intersect each other.

[0011] According to some embodiments of the present invention, along the second direction, the battery cell assembly and the drain trough are spaced apart, the guide plate is inclined from below the explosion-proof valve toward the drain trough, and the side of the guide plate away from the tray is formed as a guide slope.

[0012] According to some embodiments of the present invention, the battery cell assembly further includes a bracket, which is disposed at the ends of the plurality of battery cells along the second direction, and one end of the current guide plate is connected to the bracket.

[0013] According to some embodiments of the present invention, the bracket is provided with a discharge hole corresponding to the explosion-proof valve.

[0014] According to some embodiments of the present invention, the battery cell assembly further includes a protective cover, which is disposed on the side of the bracket away from the battery cell, and one end of the current guide plate is connected to the protective cover.

[0015] According to some embodiments of the present invention, the protective cover is provided with a clearance hole corresponding to the discharge hole, and the discharge hole is provided with a flange protrusion facing the protective cover, the flange protrusion extending into the clearance hole.

[0016] According to some embodiments of the present invention, the flange protrusion protrudes from the side of the protective cover away from the bracket.

[0017] According to some embodiments of the present invention, the flow guide further includes an overlap plate, the overlap plate being connected to one end of the flow guide plate and arranged at an angle to the flow guide plate, and the protective cover having an overlap protrusion facing the flow guide plate, the overlap plate overlapping with the overlap protrusion.

[0018] According to some embodiments of the present invention, one of the overlapping plate and the overlapping protrusion is provided with an insertion protrusion, and the other of the overlapping plate and the overlapping protrusion is provided with an insertion hole. The overlapping plate and the overlapping protrusion are inserted into each other through the insertion protrusion and the insertion hole.

[0019] According to some embodiments of the present invention, the guide plate further includes a connecting plate, which is connected to the other end of the guide plate and is set at an angle to the guide plate, and the connecting plate extends into the discharge groove.

[0020] According to some embodiments of the present invention, the connecting plate is connected to the drain trough near the inner wall of the battery cell assembly.

[0021] According to some embodiments of the present invention, one of the connecting plate and the inner sidewall is provided with a buckle, and the other of the connecting plate and the inner sidewall is provided with a slot, and the connecting plate and the inner sidewall are engaged by the buckle and the slot.

[0022] According to some embodiments of the present invention, the guide plate is provided with a limiting protrusion, which is matched with the outer periphery of the discharge groove.

[0023] According to some embodiments of the present invention, the battery cell is provided with a positive terminal and a negative terminal at both ends along the second direction, and the battery pack further includes a connecting piece, wherein the positive terminal and the negative terminal of two adjacent battery cells are electrically connected through the connecting piece, and the connecting piece is disposed on the bracket.

[0024] According to some embodiments of the present invention, the tray includes a side beam for forming the receiving cavity, and a portion of the side beam near the battery pack is recessed downward along the height direction of the tray to form the drain groove.

[0025] According to some embodiments of the present invention, a sealing cover is also included, which is disposed on the tray to close the receiving cavity, and another portion of the side beam is sealed to the edge of the sealing cover.

[0026] According to some embodiments of the present invention, a drain valve is also included, and the drain trough is connected to the drain valve.

[0027] According to some embodiments of the present invention, the tray includes a bottom plate, and the drain valve is disposed on the bottom plate.

[0028] The following is a brief description of the electrical equipment according to a second aspect embodiment of the present invention.

[0029] The electrical device according to this utility model includes the battery pack described in any of the above embodiments. Since the electrical device according to this utility model is equipped with the battery pack described in the above embodiments, the electrical device has high safety performance and long service life.

[0030] In summary, the battery pack of this utility model forms a flow path between the battery cell and the drain tank by setting a flow guide. In the event of thermal runaway or leakage of the battery cell, the electrolyte is guided to the drain tank for discharge, thus isolating it from the battery cell and preventing the electrolyte from flowing through the tray and the battery cell, which could lead to arcing and fire. This improves the safety and service life of the battery pack.

[0031] 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

[0032] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0033] Figure 1This is a partial schematic diagram of a battery pack according to an embodiment of the present utility model.

[0034] Figure 2 This is a partial schematic diagram of a battery pack according to an embodiment of the present utility model.

[0035] Figure 3 This is a schematic diagram of the flow guide according to an embodiment of the present utility model.

[0036] Figure 4 This is a schematic diagram of the structure of the protective cover according to an embodiment of the present utility model.

[0037] Figure 5 This is a partial schematic diagram of a battery pack according to an embodiment of the present utility model.

[0038] Figure label:

[0039] 1. Battery pack; 10. Tray; 101. Drainage trough; 1011. Inner side wall; 1012. Slot; 102. Receiving cavity; 103. Side beam; 104. Base plate; 20. Cell assembly; 201. Cell; 2011. Explosion-proof valve; 202. Bracket; 2021. Discharge hole; 2022. Flanged protrusion; 203. Protective cover; 2031. Clearance hole; 2032. Overlap protrusion; 2033. Insertion hole; 30. Flow guide; 301. Flow guide plate; 3011. Flow guide slope; 3012. Limiting protrusion; 302. Overlap plate; 3021. Insertion protrusion; 303. Connecting plate; 3031. Buckle; 40. Sealing cover; 50. Drain valve; 60. Bottom guard plate. Detailed Implementation

[0040] 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 are only used to explain this utility model, and should not be construed as limiting this utility model.

[0041] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0042] 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 at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," 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 connection that allows communication between them; 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.

[0044] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0045] In related technologies, battery devices have cell packs, which include multiple cells. The terminals of the multiple cells are electrically connected by connecting pieces. However, when a cell experiences thermal runaway or leakage, the electrolyte inside the cell is sprayed out from the explosion-proof valve, which can easily conduct through the tray and connecting pieces, leading to arcing and fire. This results in low battery pack safety and short service life.

[0046] The following is for reference. Figures 1-5 The battery pack 1 according to an embodiment of the present utility model is described.

[0047] The battery pack 1 according to this utility model includes a tray 10, a cell assembly 20, and a flow guide 30. The tray 10 is provided with a drain groove 101 and a receiving cavity 102. The cell assembly 20 includes multiple cells 201 that are electrically connected to each other and is housed in the receiving cavity 102. The flow guide 30 forms a flow path between the cells 201 and the drain groove 101. Specifically, the tray 10 may include two opposing side beams 103, two opposing end beams, and a bottom plate 104 enclosing the receiving cavity 102, or the tray 10 may be integrally formed to form the receiving cavity 102, such as by integral die casting. The drain trough 101 can be formed inside the beam of the tray 10, and can be used to connect the receiving cavity 102 and the external environment. In other embodiments, the drain trough 101 is disposed within the receiving cavity 102. The drain trough 101 can be formed by slotting the bottom plate 104 or by other internal structural components, thus directly connecting to the receiving cavity 102 for easy reception of electrolyte. The battery cell assembly 20 is housed within the receiving cavity 102 and placed on the bottom plate 104 of the tray 10. Multiple battery cells 201 can be connected in series, parallel, or series-parallel via connecting pieces or metal wires, etc., without limitation. The battery cell 201 generally includes an electrode core, a housing, and a cover plate. The housing and cover plate are sealed together. The electrode core is disposed within the housing. The battery cell 201 can also be equipped with an explosion-proof valve 2011 to open when the gas pressure reaches a preset threshold. The explosion-proof valve 2011 can be disposed on the housing or the cover plate. In the event of thermal runaway or leakage in the battery cell 201, the electrolyte inside the battery cell 201 may flow out from the explosion-proof valve 2011 or from weak points in the seal of the battery cell 201, such as the connection between the explosion-proof valve 2011 and the housing of the battery cell 201, or the connection between the housing and the cover plate. After the electrolyte flows out of the battery cell 201, it is easy to accumulate and then conduct through the tray 10 and the connecting piece, causing arcing and fire. Therefore, the present invention also provides a flow guide 30, which forms a flow path between the battery cell 201 and the drain tank 101. It can guide the electrolyte flowing out of the battery cell 201 into the drain tank 101 to isolate the electrolyte, or it can discharge the electrolyte to the outside of the receiving cavity 102. More specifically, the guide member 30 can be inclined to form a guide slope 3011. One end of the guide slope 3011 is located below the explosion-proof valve 2011 of the cell 201 or below the connection between the housing and the cover plate to catch the electrolyte flowing out of the cell 201. The other end of the guide slope 3011 extends into the drain tank 101, thus forming a guide path to guide the electrolyte into the drain tank 101 and discharge it from the drain tank 101 to the outside of the tray 10. In other embodiments, a guide channel can be formed inside the guide member 30. One end of the guide channel can surround the explosion-proof valve 2011 of the cell 201 or the connection between the housing and the cover plate, and the other end of the guide channel connects to the drain tank 101, thus forming a guide path to guide the electrolyte into the drain tank 101 and discharge it from the drain tank 101 to the outside of the tray 10.

[0048] According to the battery pack 1 of this utility model, by setting the flow guide 30 to form a flow path between the cell 201 and the drain tank 101, when the cell 201 experiences thermal runaway or leakage, the electrolyte is guided to the drain tank 101 for discharge, thus isolating it from the cell 201 and preventing the electrolyte from flowing through the tray 10 and the cell 201, which could lead to arcing and fire, thereby improving the safety and service life of the battery pack 1.

[0049] According to some embodiments of the present invention, a plurality of battery cells 201 are arranged along a first direction X, and at least one end of the battery cell 201 along a second direction Y is provided with an explosion-proof valve 2011. The flow guide 30 includes a flow guide plate 301. Along the height direction Z of the tray 10, one end of the flow guide plate 301 is located below the explosion-proof valve 2011, and the other end of the flow guide plate 301 is located in the drain trough 101, so as to form a flow guide path between the explosion-proof valve 2011 and the drain trough 101. The first direction X, the second direction Y and the height direction Z intersect each other. Specifically, the tray 10 can be constructed as a quadrilateral. The first direction X can be the length or width direction of the tray 10, and the second direction Y can be the width or length direction of the tray 10. Explosion-proof valves 2011 can be provided at both ends of the battery cell 201 along the second direction Y, or only at one end. In this embodiment, the battery cells 201 are arranged sequentially along the length direction of the tray 10. The flow guide 30 includes a flow guide plate 301. In the height direction Z of the tray 10, one end of the flow guide plate 301 is located below the explosion-proof valve 2011, so as to catch the electrolyte flowing out of the explosion-proof valve 2011. The other end of the flow guide plate 301 is located in the drain tank 101, so as to form a flow path between the explosion-proof valve 2011 and the drain tank 101, and guide the electrolyte to the drain tank 101. The other end of the guide plate 301 can be located inside or at the edge of the drain tank 101, allowing the electrolyte to flow into the drain tank 101. This design facilitates the manufacturing and installation of the guide component 30 and saves costs.

[0050] In some embodiments, one end of the battery cell 201 along the second direction Y is provided with an explosion-proof valve 2011. Multiple battery cells 201 are connected in series by connecting pieces, that is, adjacent battery cells 201 are installed in opposite directions. After being connected into a battery cell group 20, the battery cell group 20 has explosion-proof valves 2011 at both ends. Then, both ends of the battery cell group 20 along the second direction Y are provided with guide members 30 and drain channels 101. Two guide members 30 are arranged opposite each other along the second direction Y, and two drain channels 101 are arranged opposite each other along the second direction Y. This can increase the application scenarios of the guide members 30, facilitate the layout of the guide members 30, and save costs.

[0051] According to some embodiments of this utility model, the battery cell assembly 20 and the drain tank 101 are spaced apart along the second direction Y. The guide plate 301 is inclined towards the drain tank 101 from below the explosion-proof valve 2011, and the side of the guide plate 301 facing away from the tray 10 forms a guide slope 3011. Specifically, the battery cell assembly 20 is provided with a drain tank 101 on the outer side along the second direction Y, and the battery cell assembly 20 and the drain tank 101 are spaced apart, which can reduce the possibility of electrolyte contacting the battery cell 201. The guide plate 301 is inclined below the explosion-proof valve 2011 towards the drain tank 101. The side of the guide plate 301 away from the tray 10 forms a guide slope 3011. That is, the electrolyte flowing out of the explosion-proof valve 2011 can flow into the drain tank 101 through the guide slope 3011, which increases the flow rate. The design of the guide slope 3011 makes it easier for the electrolyte to flow into the drain tank 101, thus improving safety.

[0052] According to some embodiments of this utility model, the battery cell assembly 20 further includes a support 202, which is disposed at the ends of the plurality of battery cells 201 along the second direction Y, and one end of the flow guide plate 301 is connected to the support 202. Specifically, the supports 202 are provided at the ends of the plurality of battery cells 201. The supports 202 can provide positioning and support for the stacking of battery cells 201, making the structure more stable. At the same time, the connection of one end of the flow guide plate 301 to the support 202 can enhance the stability of the flow guide plate 301 and improve the stability of the flow.

[0053] In some embodiments, the battery cell 201 has a positive terminal and a negative terminal at both ends along the second direction Y. The battery pack also includes a connecting piece, and the positive and negative terminals of two adjacent battery cells 201 are electrically connected through the connecting piece, which is located on the bracket 202. Specifically, since the battery cell 201 has a positive terminal and a negative terminal at both ends, two current paths can be formed inside the battery cell 201, which can increase the charging speed of the battery cell 201 and improve the fast charging performance of the battery pack 1. The positive and negative terminals at both ends of two adjacent battery cells 201 are connected in series through the connecting piece. The connecting piece can be electrically connected to the positive and negative terminals by welding. The connecting piece can be connected to the bracket 202 by means of bonding, snap-fitting, etc., which improves the stability of the connecting piece.

[0054] According to some embodiments of this utility model, the bracket 202 is provided with a discharge hole 2021 corresponding to the explosion-proof valve 2011. Specifically, the bracket 202 is connected to the end face of the battery cell 201 along the second direction Y and covers the end face of the battery cell 201. In order not to block the discharge path of the explosion-proof valve 2011, the bracket 202 has a discharge hole 2021 at the position corresponding to the explosion-proof valve 2011. This arrangement can prevent the electrolyte flowing out of the explosion-proof valve 2011 from flowing into the gap between the battery cell 201 and the bracket 202, and smoothly discharge the electrolyte onto the guide slope 3011, thereby improving safety.

[0055] According to some embodiments of this utility model, the battery cell assembly 20 further includes a protective cover 203, which is disposed on the side of the bracket 202 away from the battery cell 201, and one end of the current guide plate 301 is connected to the protective cover 203. Specifically, the bracket 202 is also connected to the protective cover 203, which is used to protect the terminal posts, connecting pieces, and other structures of the battery cell 201. Generally, the protective cover 203 is made of insulating material to insulate the battery cell 201 from the outside, thereby improving electrical safety. One end of the current guide plate 301 is connected to the protective cover 203, and the protective cover 203 is connected to the bracket 202, which can form a stable connection structure and improve connection stability.

[0056] According to some embodiments of this utility model, the protective cover 203 is provided with a clearance hole 2031 corresponding to the discharge hole 2021. The discharge hole 2021 is provided with a flanged protrusion 2022 facing the protective cover 203, and the flanged protrusion 2022 extends into the clearance hole 2031. Specifically, the protective cover 203 covers the end of the battery cell assembly 20. In order not to block the discharge path of the explosion-proof valve 2011, the protective cover 203 is provided with a clearance hole 2031 at the position corresponding to the discharge hole 2021. At the same time, the discharge hole 2021 has a flanged protrusion 2022 structure, and the flanged protrusion 2022 extends into the clearance hole 2031. This can prevent the electrolyte flowing out of the explosion-proof valve 2011 from flowing into the gap between the bracket 202 and the protective cover 203, and smoothly discharge the electrolyte onto the guide slope 3011, thereby improving safety.

[0057] According to some embodiments of this utility model, the flange protrusion 2022 protrudes from the protective cover 203 away from the side of the bracket 202. That is, the flange protrusion 2022 extends outside the avoidance hole 2031, further preventing the electrolyte flowing out of the explosion-proof valve 2011 from flowing into the gap between the bracket 202 and the protective cover 203, and smoothly draining the electrolyte onto the guide slope 3011, thus improving safety.

[0058] According to some embodiments of this utility model, the flow guide 30 further includes an overlapping plate 302. The overlapping plate 302 is connected to one end of the flow guide 301 and is set at an angle to the flow guide 301. The protective cover 203 is provided with an overlapping protrusion 2032 facing the flow guide 301, and the overlapping plate 302 overlaps with the overlapping protrusion 2032. Specifically, the overlapping plate 302 is connected to one end of the flow guide 301 near the protective cover 203 and has an angle with the protective cover 203. For example, the overlapping plate 302 extends along the second direction Y and overlaps with the protective cover 203. A part of the protective cover 203 protrudes towards the flow guide 30 to form the overlapping protrusion 2032. The overlapping plate 302 and the overlapping protrusion 2032 overlap along the third direction, which improves the connection stability between the flow guide 301 and the protective cover 203 and simplifies the manufacturing process.

[0059] According to some embodiments of this utility model, one of the overlapping plate 302 and the overlapping protrusion 2032 is provided with an insertion protrusion 3021, and the other of the overlapping plate 302 and the overlapping protrusion 2032 is provided with an insertion hole 2033. The overlapping plate 302 and the overlapping protrusion 2032 are connected by the insertion protrusion 3021 and the insertion hole 2033. Specifically, the overlapping plate 302 can be provided with an insertion protrusion 3021, and the overlapping protrusion 2032 can be provided with an insertion hole 2033. The insertion protrusion 3021 is inserted into the insertion hole 2033, which is equivalent to hanging the flow guide 30 on the protective cover 203, further improving the connection stability between the flow guide 30 and the protective cover 203, and simplifying the manufacturing process.

[0060] According to some embodiments of this utility model, the flow guide 30 further includes a connecting plate 303, which is connected to the other end of the flow guide 301 and is set at an angle to the flow guide 301. The connecting plate 303 extends into the drain trough 101. Specifically, the connecting plate 303 is connected to the other end of the flow guide 301 away from the battery cell assembly 20 and is set at an angle to the flow guide 301. For example, the connecting plate 303 can extend in a third direction and extend into the drain trough 101. The connecting plate 303 can abut or adhere to the inner wall of the drain trough 101. This arrangement can improve the stability of the flow guide 301 installation and also facilitate the smooth flow of electrolyte on the flow guide slope 3011 into the drain trough 101, thereby improving stability and safety.

[0061] According to some embodiments of this utility model, the connecting plate 303 is connected to the inner wall 1011 of the drain trough 101 near the battery cell 201. Specifically, the drain trough 101 can be a U-shaped structure, including a bottom wall and two opposing inner walls 1011. The connecting plate 303 can be connected to the inner wall 1011 of the battery cell 201 by means of adhesive bonding, snap-fit, etc. In this way, the guide member 30 is set on the side of the drain trough 101 near the battery cell assembly 20, which provides a larger drain space and allows the guide member 30 to more accurately guide the electrolyte into the drain trough 101, improving safety. In other embodiments, the inner wall of the drain trough 101 can be arc-shaped. In this case, the connecting plate 303 can be connected to the arc-shaped inner wall on the side near the battery cell assembly 20.

[0062] According to some embodiments of this utility model, one of the connecting plate 303 and the inner sidewall 1011 is provided with a buckle 3031, and the other of the connecting plate 303 and the inner sidewall 1011 is provided with a groove 1012. The connecting plate 303 and the inner sidewall 1011 are engaged by the buckle 3031 and the groove 1012. Specifically, the side of the connecting plate 303 facing the inner sidewall 1011 can protrude to form the buckle 3031, and the inner sidewall 1011 can be recessed in the direction away from the connecting plate 303 to form the groove 1012. The buckle 3031 and the groove 1012 engage to improve the connection stability between the connecting plate 303 and the inner sidewall 1011, and further improve the overall installation stability of the guide member 30.

[0063] According to some embodiments of this utility model, the guide plate 301 is provided with a limiting protrusion 3012, which is matched with the outer periphery of the drain trough 101 for limiting. Specifically, the guide plate 301 can partially protrude on the side facing the battery pack 20 to form the limiting protrusion 3012. The limiting protrusion 3012 can abut against the outer periphery of the drain trough 101, preventing the connecting plate 303 from impacting the drain trough 101 during use and causing the connection between the connecting plate 303 and the guide plate 301 to break, thereby improving the overall strength and installation stability of the guide component 30.

[0064] According to some embodiments of the present invention, there are multiple guide members 30, which are connected sequentially along the first direction X and are all connected to the protective cover 203 and the drain groove 101. This arrangement can prevent the guide members 30 from being too long and improve the strength and stability of the guide members 30.

[0065] According to some embodiments of the present invention, the tray 10 includes a side beam 103, which forms a receiving cavity 102. A portion of the side beam 103 near the battery cell assembly 20 is recessed downward along the height direction Z of the tray 10 to form a drain groove 101. Specifically, the side beam 103 is located on at least one side of the battery cell assembly 20 along the second direction Y. A portion of the side beam 103 near the battery cell assembly 20 is recessed downward along the height direction Z of the tray 10 to form the drain groove 101. In this way, the drain groove 101 can be integrally formed by the side beam 103, reducing the number of parts, lowering the installation difficulty and cost, and the drain groove 101 has high strength.

[0066] According to some embodiments of this utility model, the battery pack 1 further includes a sealing cover 40, which covers the tray 10 to seal the receiving cavity 102. A portion of the side beam 103 is sealed to the edge of the sealing cover 40. Specifically, the sealing cover 40 covers the tray 10, protecting the battery cell assembly 20, the current guide 30, etc., within the inner wall of the receiving cavity 102 to prevent damage and improve safety. Meanwhile, the other portion of the side beam 103 is the part adjacent to the drain groove 101. This part is sealed to the edge of the sealing cover 40 by bonding, sealing foam, screwing, etc. With this arrangement, when the battery pack 1 experiences an accident and the seal fails, leaked water will preferentially enter the drain groove 101. The drain groove 101 can also effectively guide the leaked water out of the tray 10, ensuring that the battery pack 1 module is not affected by water ingress, thereby ensuring the structural safety of the battery pack 1.

[0067] According to some embodiments of this utility model, the battery pack 1 further includes a drain valve 50, and the drain trough 101 is connected to the drain valve 50. Specifically, the drain valve 50 can be set on the side beam 103 or the bottom plate 104 of the tray 10, and the drain trough 101 has an opening facing the drain valve 50, and the drain trough 101 is connected to the drain valve 50 through the opening. By setting the drain valve 50, the electrolyte can be discharged to the outside of the tray 10 while ensuring the sealing of the receiving cavity 102, thus improving safety performance. In other embodiments, a drainage and venting membrane can be set on the tray 10. Generally, the drainage and venting membrane can ensure the sealing of the receiving cavity 102, balance the internal and external pressure difference, and allow the electrolyte to drain along the drain trough 101 to the drainage and venting membrane. In still other embodiments, the drain valve 50 can be directly set in the drain trough 101, and the electrolyte is guided to the drain trough 101 and then directly discharged to the outside of the tray 10 through the drain valve 50. More specifically, the drain trough 101 extends along the first direction X, and both ends of the drain trough 101 along the first direction X are provided with openings, and two drain valves 50 are provided accordingly, which can increase the drainage speed and improve the safety of the battery pack 1.

[0068] According to some embodiments of this utility model, the tray 10 includes a base plate 104, and a drain valve 50 is disposed on the base plate 104. Specifically, the tray 10 includes a base plate 104 and a side beam 103, which together form a receiving cavity 102. A mounting hole is provided on the base plate 104, and the drain valve 50 passes through the mounting hole. A portion of the drain valve 50 is located on the outer side of the base plate 104 opposite to the receiving cavity 102, and the drain valve 50 is sealed to the outer side of the base plate 104 by a sealing ring and bolts.

[0069] According to some embodiments of the present invention, a cooling channel is provided inside the base plate 104 for circulating cooling medium. The base plate 104 can cool or heat the battery cell assembly 20, integrating multiple functions and reducing the complexity and cost of the battery pack 1. The drain valve 50 is separated from the cooling channel to avoid mutual interference.

[0070] According to some embodiments of this utility model, the battery pack 1 further includes a bottom protective plate 60. The bottom protective plate 60 is located on the side of the bottom plate 104 opposite to the receiving cavity 102. The bottom protective plate 60 can be fastened to the side beam 103 of the tray 10 by bolts or welding, thus protecting the tray 10 and the battery cell 201. More specifically, the bottom protective plate 60 has a through hole corresponding to the position of the drain valve 50, which can avoid the drain valve 50, thereby improving the smoothness and speed of drainage and improving the safety of the battery pack 1.

[0071] The electrical equipment according to this utility model is briefly described below.

[0072] The electrical device according to this utility model includes the battery pack 1 described in any of the above embodiments. Because the electrical device according to this utility model is equipped with the battery pack 1 of the above embodiments, it has high safety and a long service life. The electrical device can be a vehicle, ferry, aircraft, energy storage device, etc., and is not limited thereto.

[0073] In summary, according to the present invention, the battery pack 1 forms a flow path between the cell 201 and the drain tank 101 by setting the flow guide 30. When the cell 201 experiences thermal runaway or leakage, the electrolyte is guided to the drain tank 101 for discharge, thus isolating it from the cell 201. This prevents the electrolyte from flowing through the tray 10 and the cell 201, which could lead to arcing and fire, thereby improving the safety and service life of the battery pack 1.

[0074] 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. In addition, those skilled in the art can combine and integrate the different embodiments or examples described in this specification. Although embodiments of the present invention have been shown and described above, variations, modifications, substitutions, and alterations can be made to the above embodiments.

Claims

1. A battery pack (1), characterized in that, include: The tray (10) is provided with a drain groove (101) and a receiving cavity (102) inside the tray (10). A battery cell assembly (20) comprising a plurality of electrically connected battery cells (201) and housed in the receiving cavity (102); A flow guide (30) forms a flow path between the battery cell (201) and the drain tank (101).

2. The battery pack (1) according to claim 1, characterized in that, The battery cell (201) is equipped with an explosion-proof valve (2011), and the flow guide (30) forms the flow guide path between the explosion-proof valve (2011) and the discharge tank (101).

3. The battery pack (1) according to claim 2, characterized in that, Multiple battery cells (201) are arranged along a first direction. At least one end of each battery cell (201) along a second direction is provided with the explosion-proof valve (2011). The flow guide (30) includes a flow guide plate (301). Along the height direction of the tray (10), one end of the flow guide plate (301) is located below the explosion-proof valve (2011), and the other end of the flow guide plate (301) is located in the drain trough (101) to form the flow guide path between the explosion-proof valve (2011) and the drain trough (101). The first direction, the second direction, and the height direction intersect each other.

4. The battery pack (1) according to claim 3, characterized in that, Along the second direction, the battery cell assembly (20) and the drain trough (101) are spaced apart, and the guide plate (301) is inclined from below the explosion-proof valve (2011) toward the drain trough (101), and the side of the guide plate (301) away from the tray (10) is formed as a guide slope (3011).

5. The battery pack (1) according to claim 4, characterized in that, The battery cell assembly (20) also includes a bracket (202) disposed at the ends of the plurality of battery cells (201) along the second direction, and one end of the flow guide plate (301) is connected to the bracket (202).

6. The battery pack (1) according to claim 5, characterized in that, The bracket (202) is provided with a discharge hole (2021) corresponding to the explosion-proof valve (2011).

7. The battery pack (1) according to claim 6, characterized in that, The battery cell assembly (20) also includes a protective cover (203), which is located on the side of the bracket (202) away from the battery cell (201), and one end of the flow guide plate (301) is connected to the protective cover (203).

8. The battery pack (1) according to claim 7, characterized in that, The protective cover (203) is provided with a clearance hole (2031) corresponding to the discharge hole (2021), and the discharge hole (2021) is provided with a flange protrusion (2022) facing the protective cover (203), and the flange protrusion (2022) extends into the clearance hole (2031).

9. The battery pack (1) according to claim 8, characterized in that, The flange protrusion (2022) protrudes from the side of the protective cover (203) away from the bracket (202).

10. The battery pack (1) according to claim 7, characterized in that, The flow guide (30) further includes an overlap plate (302), which is connected to one end of the flow guide (301) and is set at an angle to the flow guide (301). The protective cover (203) is provided with an overlap protrusion (2032) facing the flow guide (301), and the overlap plate (302) overlaps with the overlap protrusion (2032).

11. The battery pack (1) according to claim 10, characterized in that, One of the overlapping plate (302) and the overlapping protrusion (2032) is provided with a plugging protrusion (3021), and the other of the overlapping plate (302) and the overlapping protrusion (2032) is provided with a plugging hole (2033). The overlapping plate (302) and the overlapping protrusion (2032) are plugged in through the plugging protrusion (3021) and the plugging hole (2033).

12. The battery pack (1) according to claim 4, characterized in that, The flow guide (30) also includes a connecting plate (303), which is connected to the other end of the flow guide (301) and is set at an angle to the flow guide (301). The connecting plate (303) extends into the drain trough (101).

13. The battery pack (1) according to claim 12, characterized in that, The connecting plate (303) is connected to the inner wall (1011) of the drain trough (101) near the cell (201).

14. The battery pack (1) according to claim 13, characterized in that, One of the connecting plate (303) and the inner sidewall (1011) is provided with a buckle (3031), and the other of the connecting plate (303) and the inner sidewall (1011) is provided with a slot (1012). The connecting plate (303) and the inner sidewall (1011) are engaged by the buckle (3031) and the slot (1012).

15. The battery pack (1) according to claim 13, characterized in that, The guide plate (301) is provided with a limiting protrusion (3012), which is in a limiting fit with the outer periphery of the discharge groove (101).

16. The battery pack (1) according to claim 5, characterized in that, The battery cell (201) has a positive terminal and a negative terminal at both ends along the second direction. The battery cell group (20) also includes a connecting piece. The positive terminal and the negative terminal of two adjacent battery cells (201) are electrically connected through the connecting piece. The connecting piece is located on the bracket (202).

17. The battery pack (1) according to any one of claims 1-16, characterized in that, The tray (10) includes a side beam (103) for forming the receiving cavity (102), and a portion of the side beam (103) near the battery cell assembly (20) is recessed downward along the height direction of the tray (10) to form the drain groove (101).

18. The battery pack (1) according to claim 17, characterized in that, It also includes a sealing cap (40) which covers the tray (10) to close the receiving cavity (102), and another part of the side beam (103) is sealed to the edge of the sealing cap (40).

19. The battery pack (1) according to any one of claims 1-16, characterized in that, It also includes a drain valve (50), and the drain trough (101) is connected to the drain valve (50).

20. The battery pack (1) according to claim 19, characterized in that, The tray (10) includes a base plate (104), and the drain valve (50) is disposed on the base plate (104).

21. An electrical appliance, characterized in that, Includes the battery pack (1) according to any one of claims 1-20.

Images