Battery pack and electric device

Abstract

The utility model relates to battery technical field discloses a kind of battery pack and electrical equipment, first plate is arranged in battery pack in box, and the space in box is divided into liquid cooling cavity and pressure relief cavity;Battery pack is housed in liquid cooling cavity, and the efficient cooling of battery pack is realized;First plate includes body part and multiple first protruding parts, multiple first protruding parts play the role of reinforcing rib, so that the overall structural strength of first plate is strengthened, so that battery pack main body structure can withstand the circulating pressure when cooling liquid circulates in liquid cooling cavity with higher flow rate;First protruding part and / or body part are provided with weak area arranged opposite to explosion-proof valve, when thermal runaway occurs inside battery, thermal runaway fluid first breaks explosion-proof valve, then breaks weak area, and then enters into pressure relief cavity, to avoid thermal runaway fluid spread in liquid cooling cavity;Therefore, the battery pack of the utility model guarantees the structural strength of battery pack main body and the heat dissipation effect 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] With the rapid pace of development, new energy vehicles are moving towards high-rate fast charging, which places increasingly higher demands on battery pack heat dissipation. Power battery packs generate a significant amount of heat during charging and discharging, especially at high charging rates. If the temperature is not reduced to a sufficient level in time, it will affect the normal operation of the battery pack, potentially leading to insufficient heat exchange, poor temperature uniformity, and other problems. This will impact battery pack performance and lifespan, ultimately affecting the entire vehicle.

[0003] Submersible battery packs allow individual cells to directly contact the coolant, resulting in excellent cooling performance; the submersible battery pack essentially functions as a large cooling pipeline. To maintain high heat exchange efficiency, the coolant typically requires a fast circulation rate. This fast circulation rate leads to significant circulating pressure of the coolant flowing through the battery pack, necessitating high structural strength for the battery pack itself. Therefore, ensuring high reliability requires guaranteeing both the structural strength of the battery pack and its effective heat dissipation. Utility Model Content

[0004] The purpose of this utility model is to provide a battery pack and electrical equipment that ensures the structural strength of the battery pack body and the heat dissipation effect of the battery pack.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application provide a battery pack having a first direction, a second direction, and a third direction that intersect each other, characterized in that it includes: a housing, a battery pack, and a first plate;

[0006] The housing has a receiving cavity, the first plate is disposed in the receiving cavity, and divides the receiving cavity into a liquid cooling cavity and a pressure relief cavity; in the third direction, the liquid cooling cavity is located on one side of the pressure relief cavity;

[0007] The battery pack is housed within the liquid cooling cavity. The battery pack includes multiple individual cells. Each individual cell includes a cell body and an explosion-proof valve. The explosion-proof valve is connected to the cell body on the side of the cell body facing upwards towards the first plate.

[0008] The first plate includes a body portion and a plurality of first protrusions, the plurality of first protrusions extending along the first direction and the plurality of first protrusions being spaced apart along the second direction;

[0009] The first plate also includes a weak area disposed on the body portion and / or the first protrusion portion; in the third direction, the weak area is at least partially opposite to the explosion-proof valve; the weak area is configured to be ruptured by the high-pressure fluid in the single cell and connected to the pressure relief chamber when the explosion-proof valve is ruptured by the high-pressure fluid.

[0010] In some embodiments of this application, the weak area is located on the first protrusion.

[0011] In some embodiments of this application, in the third direction, a plurality of the first protrusions protrude toward the direction of the single battery cell;

[0012] The battery pack further includes a connecting plate extending along the first direction. The connecting plate is disposed between two adjacent first protrusions. There are multiple connecting plates, and the multiple connecting plates are spaced apart along the second direction.

[0013] In the third direction, one side of the connecting plate is fixedly connected to the side of the plurality of individual batteries that are equipped with explosion-proof valves, and the other side of the connecting plate is fixedly connected to the main body.

[0014] In some embodiments of this application, in the third direction, a plurality of the first protrusions protrude toward the direction of the single battery cell;

[0015] In the third direction, the first protrusion has an exhaust groove on the side facing the pressure relief chamber. In the third direction, the exhaust groove has an opening and a wall. The opening communicates with the pressure relief chamber, and the wall is opposite to the opening. The weak area is located on the wall.

[0016] In some embodiments of this application, the first plate further includes a seal, the groove wall has an opening extending along the third direction, the opening communicating with the vent groove, and the seal covering the opening; in the third direction, the area of ​​the seal opposite to the opening forms the weak area; the seal is configured to be ruptured by the high-pressure fluid in the single cell and connected to the opening when the explosion-proof valve is ruptured by the high-pressure fluid.

[0017] In some embodiments of this application, the sealing element includes a second plate; in the third direction, the second plate is disposed between the first plate and the explosion-proof valve, and the second plate is in close contact with the first plate; a portion of the second plate protrudes along the third direction and toward the explosion-proof valve, forming a second protrusion;

[0018] In the third direction, the first protrusion corresponds to the second protrusion.

[0019] In some embodiments of this application, a plurality of the individual cells are arranged in multiple columns in the first direction and in multiple rows in the second direction; two adjacent individual cells in the same column have a first support portion and a second support portion, and both the first support portion and the second support portion are connected to the connecting plate on the side of the connecting plate facing away from the first plate in the third direction.

[0020] In some embodiments of this application, the box body further includes a cover, side beams, inner beams, and a bottom plate;

[0021] The box-shaped side beams include a first side beam and a second side beam spaced apart along the second direction, and a third side beam and a fourth side beam spaced apart along the first direction;

[0022] The inner beam of the box includes a first inner beam and a second inner beam that are spaced apart along the first direction, and both the first inner beam and the second inner beam are located inside the box.

[0023] The first inner beam, the second inner beam, the first side beam, the second side beam, the cover, and the first plate form the liquid cooling cavity; the first side beam, the second side beam, the third side beam, the fourth side beam, the bottom plate, and the first plate form the pressure relief cavity.

[0024] In some embodiments of this application, the battery pack further includes a support plate extending along the first direction, and there are multiple support plates, which are spaced apart along the second direction.

[0025] The support plate is disposed between the first plate and the base plate. In the third direction, one side of the support plate is connected to the first plate, and the other side of the support plate is connected to the base plate. The positions of the support plate and the connecting plate are corresponding.

[0026] In some embodiments of this application, the connecting plate has a cavity that extends within the connecting plate along the first direction.

[0027] In some embodiments of this application, in the second direction, through holes are provided on both sides of the connecting plate, and the through holes connect the liquid cooling cavity and the cavity; a plurality of through holes are provided at intervals along the first direction.

[0028] In some embodiments of this application, the pressure relief chamber includes a first sub-cavity, a second sub-cavity, and a third sub-cavity;

[0029] In the third direction, the pressure relief cavity and the area corresponding to the projection of the first plate form the first sub-cavity; the space between the third side beam and the first inner beam forms the second sub-cavity, and the space between the fourth side beam and the second inner beam forms the third sub-cavity; both the second sub-cavity and the third sub-cavity are connected to the first sub-cavity;

[0030] The second sub-cavity and / or the third sub-cavity are connected to an exhaust valve for venting air to the outside.

[0031] Secondly, embodiments of this application provide an electrical device including any of the battery packs described in the above embodiments.

[0032] Compared with the prior art, the battery pack and electrical equipment of this utility model have the following advantages: This solution divides the internal space of the housing into a liquid cooling chamber and a pressure relief chamber by setting a first plate inside the housing; the battery pack is housed in the liquid cooling chamber, achieving efficient cooling of the battery pack; the first plate includes a main body and multiple first protrusions, which act as reinforcing ribs, strengthening the overall structural strength of the first plate and enabling the main structure of the battery pack to withstand the circulating pressure of the coolant circulating at a high flow rate in the liquid cooling chamber; the first protrusions and / or the main body are provided with weak areas arranged opposite to the explosion-proof valves of the individual cells in the battery pack. When thermal runaway occurs inside the battery, the runaway fluid first bursts the explosion-proof valve, then breaks through the weak area, and then enters the pressure relief chamber, preventing the thermal runaway fluid from spreading within the liquid cooling chamber; therefore, the battery pack of this utility model ensures the structural strength of the battery pack body and the heat dissipation effect of the battery pack. Attached Figure Description

[0033] Figure 1 This is an exploded view of the overall structure of the battery pack of this utility model;

[0034] Figure 2 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0035] Figure 3 This is a schematic diagram of the overall structure of the battery pack of this utility model;

[0036] Figure 4 This is an exploded view of the first and second plates of this utility model;

[0037] Figure 5 This is a top view of the first plate of this utility model before the second plate is connected;

[0038] Figure 6 This is a top view of the overall structure of the battery pack of this utility model;

[0039] Figure 7 This utility model Figure 6 Schematic diagram of the cross-sectional structure at section AA;

[0040] Figure 8 This utility model Figure 7 Enlarged schematic diagram of the structure at point B;

[0041] Figure 9 This utility model Figure 7 Enlarged schematic diagram of the structure at point C;

[0042] Figure 10 This utility model Figure 6 Schematic diagram showing the positional relationship between the liquid cooling chamber and the pressure relief chamber after cross-section view of section BB;

[0043] Figure 11 This is a schematic diagram of the box body structure of this utility model;

[0044] Figure 12 This is a schematic diagram of the single-cell battery structure of this utility model.

[0045] In the diagram, 1 is the housing; 11 is the liquid cooling chamber; 12 is the pressure relief chamber; 121 is the first sub-cavity; 122 is the second sub-cavity; 123 is the third sub-cavity; 13 is the cover; 14 is the housing side beam; 141 is the first side beam; 142 is the second side beam; 143 is the third side beam; 144 is the fourth side beam; 15 is the housing inner beam; 151 is the first inner beam; 152 is the second inner beam; 16 is the bottom plate; and 161 is the groove.

[0046] 2. First plate; 21. First protrusion; 211. Weak area; 212. Venting groove; 2121. Groove opening; 2122. Groove wall; 21221. Opening; 22. Body; 23. First flange face; 24. Bolt hole; 25. Second plate; 251. Second protrusion; 252. Second flange face;

[0047] 3. Battery pack; 31. Individual cell; 311. Individual cell body; 312. Explosion-proof valve; 313. Terminal post; 314. First top support; 315. Second top support;

[0048] 4. Connecting plate; 41. Cavity; 42. Through hole;

[0049] 5. Support plate; 6. Sealing ring; 7. Adhesive layer; 8. Exhaust valve. Detailed Implementation

[0050] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0051] In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. It should also be understood that the terms "first," "second," etc., are used in this utility model to describe various information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this utility model, "first" information can also be referred to as "second" information, and similarly, "second" information can also be referred to as "first" information.

[0052] like Figures 1 to 12 As shown, this application proposes a preferred embodiment of a battery pack, having intersecting first directions X, second directions Y, and a third direction Z. The battery pack includes a battery assembly 3, a housing 1, and a first plate 2. The housing 1 has a receiving cavity, and the first plate 2 is disposed in the receiving cavity, dividing the receiving cavity into a liquid cooling cavity 11 and a pressure relief cavity 12, which are isolated by the first plate 2. The battery assembly 3 includes multiple individual cells 31, and each individual cell 31 includes a cell body 311 and an explosion-proof valve 312. The explosion-proof valve 312 is disposed on the side of the individual cell 31 along the third direction Z closer to the first plate 2. Figure 7As shown, in the third direction Z, the liquid cooling chamber 11 is located above the pressure relief chamber 12. The battery pack 3 is housed in the liquid cooling chamber 11, and the side of the individual battery 31 equipped with the explosion-proof valve 312 is fixedly connected to the first plate 2. The other side of the individual battery 31 along the third direction Z is fixedly connected to the side wall of the liquid cooling chamber 11 away from the first plate 2. Coolant flows in the liquid cooling chamber 11, and inlet and outlet ports are connected to both ends of the liquid cooling chamber 11 along the first direction X. The coolant enters the liquid cooling chamber 11 through the inlet port and exits the liquid cooling chamber 11 through the outlet port. The battery pack 3 is immersed in the coolant, thereby transferring the heat generated by the individual battery 31 to the outside through the circulating coolant, and thus cooling the battery pack. The first plate 2 includes a body 22 and multiple first protrusions 21. The multiple first protrusions 21 extend along a first direction X and are spaced apart along a second direction Y. The arrangement of the first protrusions 21 is equivalent to having multiple reinforcing ribs extending along the first direction X and spaced apart along the second direction Y on the surface of the first plate 2. This helps improve the overall structural strength of the first plate 2, so that when the coolant flows at a high circulation rate in the liquid cooling chamber 11, the first plate 2 can withstand the circulation pressure generated by the coolant flowing at a high circulation rate. When the internal temperature of the battery pack is too high, the circulation rate of the coolant can be increased. To improve the cooling efficiency of the battery pack interior; the first plate 2 also includes a weak area 211 disposed on the body 22 and / or the first protrusion 21; in the third direction Z, the weak area 211 is at least partially opposite to the explosion-proof valve; the weak area 211 is configured to be ruptured by the high-pressure fluid in the single cell 31 and connected to the pressure relief chamber 12 when the explosion-proof valve 312 is ruptured by the high-pressure fluid; in this embodiment, the third direction Z is the vertical direction, the liquid cooling chamber 11 is located above the pressure relief chamber 12, and the battery pack 3 is inverted and disposed in the liquid cooling chamber 11, that is, the side of the single cell 31 with the explosion-proof valve 312 is disposed downwards; the weak area 211 is provided on the first plate 2, and the weak area 211 is located on the single cell 31. Below the explosion-proof valve 312, when thermal runaway occurs inside the single cell 31, i.e., the pressure and temperature inside the single cell 31 exceed the set value, the explosion-proof valve 312 will be broken by the thermal runaway fluid inside the single cell 31. The thermal runaway fluid flowing out of the explosion-proof valve 312 continues to break through the weak area 211 and flows into the pressure relief chamber 12 through the weak area 211, ensuring that the high-temperature gas generated by the thermal runaway of the single cell 31 will not spread in the liquid cooling chamber 11, thus improving the safety of the battery pack. At the same time, since the explosion-proof valve 312 of the single cell 31 is set downward, when the single cell 31 experiences thermal runaway, the discharged fluid will spray downward instead of towards the vehicle's cabin, ensuring the safety of the occupants in the vehicle's cabin.

[0053] In some embodiments of this application, the weak area 211 is provided on the first protrusion 21, thereby minimizing the reduction in the overall structural strength of the first plate 2 due to the provision of the weak area 211.

[0054] In some embodiments of this application, such as Figure 1 , Figure 7 , Figure 9 As shown, in the third direction Z, multiple first protrusions 21 protrude towards the direction of the single cell 31;

[0055] The battery pack also includes a connecting plate 4 extending along the first direction X. The connecting plate 4 is disposed in the liquid cooling cavity 11. In the second direction Y, the connecting plate 4 is disposed between two adjacent first protrusions 21. There are multiple connecting plates 4, and the multiple connecting plates 4 are spaced apart along the second direction Y. In the third direction Z, the connecting plate 4 is located between the individual battery 31 and the body part 22. One side of the connecting plate 4 is fixedly connected to the side of the multiple individual batteries 31 where the explosion-proof valve 312 is provided, and the other side of the connecting plate 4 is fixedly connected to the body part 22. Specifically, the two sides of the connecting plate 4 are connected and fixed to the main body 22 by adhesive or welding, and are connected and fixed to multiple individual batteries 31 by adhesive. That is, the main body 22 is connected to the battery pack 3 through multiple connecting plates 4, so that the first plate 2 and the battery pack 3 are connected as a whole. When the circulating pressure generated by the coolant circulating in the liquid cooling cavity 11 is applied to the first plate 2, the circulating pressure drives the first plate 2 to deform in a direction away from the liquid cooling cavity 11. Through the connection between the connecting plate 4 and the battery pack 3, a certain pulling and dragging effect can be achieved on the first plate 2, thereby further improving the first plate 2's ability to withstand the circulating pressure generated by the high-speed circulating flow of coolant in the liquid cooling cavity 11. In this embodiment, the setting of the connecting plate 4 also serves to support the individual battery 31. With the joint support of multiple first protrusions 21 and multiple connecting plates 4, the individual battery 31 housed in the liquid cooling cavity 11 is better supported, improving the connection strength between the individual battery 31 and the first plate 2.

[0056] In some embodiments of this application, such as Figure 7 , Figure 8As shown, in the third direction Z, the first protrusion 21 has an exhaust groove 212 on the side facing the pressure relief chamber 12. In the third direction Z, the exhaust groove 212 has an opening 2121 and a groove wall 2122. The opening 2121 communicates with the pressure relief chamber 12, and the groove wall 2122 is opposite to the opening 2121. A weak area 211 is located on the groove wall 2122. After the thermal runaway fluid flowing from the explosion-proof valve breaks through the weak area 211, it first enters the exhaust groove 212 and then flows into the pressure relief chamber 12 through the opening 2121. Specifically, in the embodiment, the first plate 2 is a sheet metal stamped or die-cast plate, and the first protrusion 21 is a pressed, upwardly protruding rib structure. Figure 8 As shown, the rib structure forms an exhaust groove 212 on the side away from the liquid cooling cavity 11. With the battery pack capacity unchanged, the existence of the exhaust groove 212 increases the cross-sectional size of the flow channel when the thermal runaway fluid is discharged through the weak area 211, and also increases the capacity of the pressure relief cavity 12. When the thermal runaway fluid breaks through the weak area 211 and enters the exhaust groove 212, it can be discharged outward quickly. This avoids the sudden increase in pressure inside the pressure relief cavity 12 when a large amount of thermal runaway fluid is generated in a short time.

[0057] In some embodiments of this application, the side of the single battery cell 31 with the explosion-proof valve 312 is bonded to the first protrusion 21 with structural adhesive, and the explosion-proof valve 312 on the single battery cell 31 is located at a position corresponding to the first protrusion 21; for example Figure 8 , Figure 12 As shown, a sealing ring 6 is provided on the outer periphery of the explosion-proof valve 312 of the single cell 31. The sealing ring 6 can isolate the liquid cooling cavity 11 and the rupture port of the explosion-proof valve 312. When the thermal runaway fluid inside the single cell 31 causes the explosion-proof valve 312 to open, the thermal runaway fluid will not enter the liquid cooling cavity 11 due to the obstruction of the sealing ring 6. Instead, it will directly break through the weak area 211 through the explosion-proof valve 312 and enter the pressure relief cavity 12. An adhesive layer 7 is provided on the first protrusion 21 located outside the sealing ring 6. The adhesive layer 7 adhesively fixes the side of the single cell 31 with the explosion-proof valve 312 to the first protrusion 21.

[0058] In some embodiments of this application, such as Figure 4 , Figure 5 , Figure 8 As shown, the first plate 2 also includes a seal, and the groove wall 2122 has an opening 21221 that extends through along the third direction Z. The opening 21221 connects to the vent groove 212, and the seal covers the opening 21221. In the third direction Z, the area opposite to the opening 21221 forms a weak area. The seal is configured to be ruptured by the high-pressure fluid in the single cell 31 when it breaks through the explosion-proof valve 312 and connects to the opening 21221.

[0059] Specifically, on the third direction Z, each protrusion corresponding to the explosion-proof valve 312 of each individual battery 31 is provided with an opening 21221, that is, the number of openings 21221 matches the number of individual batteries 31, and the seal can seal the openings 21221. At the weak area 211, the strength of the first plate 2 on the third direction Z is equal to the strength of the seal. By controlling the strength of the seal, the burst pressure can be controlled.

[0060] In some embodiments of this application, such as Figure 4 As shown, the sealing element includes a second plate 25. In the third direction Z, the second plate 25 is disposed between the first plate 2 and the explosion-proof valve 312. The second plate 25 is in contact with the first plate 2, and at least seals the opening 21221. A portion of the second plate 25 bends along the third direction Z towards the explosion-proof valve 312, forming a second protrusion 251. In the third direction Z, the first protrusion 21 and the second protrusion 251 are positioned correspondingly. This allows the first plate 2 and the second plate 25 to fit tightly together. The first plate 2 is made of a metallic material, such as steel or aluminum, while the second plate 25 is made of a non-metallic material. The insulating material is used, such as engineering plastics like PC, PP, PET, and PVC. The first plate 2 and the second plate 25 can be bonded together using a vacuum forming method or connected by adhesive. When thermal runaway occurs within the individual battery cell 31, the gas discharged through the explosion-proof valve 312 breaks through the second plate 25 at the position corresponding to the opening 21221, thus opening the weak area 211. This allows the thermal runaway fluid to be discharged through the opening 21221 into the venting groove 212, and then into the pressure relief chamber 12, where it is finally discharged outwards. The second plate 25, made of non-metallic insulating material, is placed between the first plate 2 and the battery pack 3 to ensure reliable insulation between them, improving the safety of the battery pack.

[0061] In some embodiments of this application, such as Figure 1 , Figure 9 , Figure 12 As shown, multiple individual cells 31 are arranged in multiple columns in the first direction X and in multiple rows in the second direction Y; two adjacent individual cells 31 in the same column have a first top support 314 and a second top support 315 respectively, and the first top support 314 and the second top support 315 are both connected to the connecting plate 4 on the side opposite to the first plate 2 in the third direction Z.

[0062] Specifically, such as Figure 12 As shown, the single cell 31 has terminals 313 at both ends along the second direction Y, and the explosion-proof valve 312 is located between the two terminals 313; Figure 9As shown, in the second direction Y, the center line of the connecting plate 4 is located between two adjacent rows of single cells 31. One connecting plate 4 can support two rows of single cells 31. The single cells 31 can be connected and fixed to the connecting plate 4 with the first top support 314 and the second top support 315 by adhesive bonding, so that the battery pack 3 has a stronger overall integrity and a more compact structure.

[0063] In some embodiments of this application, such as Figure 1 , Figure 7 , Figure 11 As shown, the housing 1 also includes a cover 13, side beams of the housing 1, inner beams of the housing 1, and a bottom plate 16; the side beams of the housing 1 include a first side beam 141 and a second side beam 142 spaced apart along the second direction Y, and a third side beam 143 and a fourth side beam 144 spaced apart along the first direction X; the inner beams of the housing 1 include a first inner beam 151 and a second inner beam 152 spaced apart along the first direction X, and both the first inner beam 151 and the second inner beam 152 are located inside the housing 1; the first inner beam 151, the second inner beam 152, the first side beam 141, the second side beam 142, the cover 13, and the first plate 2 form a liquid cooling cavity 11, as shown. Figure 4 As shown, a first flange face 23 is provided on the outer periphery of the first plate 2, and a second flange face 252 is provided on the outer periphery of the second plate 25. Multiple bolt holes 24 are provided on both the first flange face 23 and the second flange face 252, thereby fixing the base plate 16, the first flange face 23, the second flange face 252, and the housing 1 together with bolts. This achieves the connection and fixation between the first plate 2, the second plate 25, the base plate 16, and the housing 1. To ensure the sealing of the liquid cooling chamber 11, in the first... The end face of the flange face 23 that contacts the base plate 16, and the end face of the second flange face 252 that contacts the box body 1 along the third direction Z, are all filled with sealant for sealing. In the third direction Z, the first plate 2, the first inner beam 151, and the second inner beam 152 are all spaced apart from the base plate 16 on the side facing the base plate 16, thereby forming a pressure relief chamber 12 between the first plate 2, the first side beam 141, the second side beam 142, the third side beam 143, the fourth side beam 144, and the base plate 16.

[0064] like Figure 10 The diagram shows the spatial distribution of the liquid cooling chamber 11 and the pressure relief chamber 12 within the housing 1. Specifically, the liquid cooling chamber 11 is located above the pressure relief chamber 12. When a single battery cell 31 experiences thermal runaway, the high-temperature gas generated is discharged into the pressure relief chamber 12 through the corresponding opening 21221, and finally discharged to the outside through the pressure relief chamber 12. To further improve the overall structural strength of the battery pack, such as... Figure 1 , Figure 9As shown, a plurality of grooves 161 are provided on the base plate 16. A portion of the base plate 16 is deformed toward the pressure relief chamber 12 to form grooves 161. All grooves 161 extend along the first direction X, and all grooves 161 are spaced apart along the second direction Y. Preferably, the positions of the grooves 161 on the base plate 16 correspond to the positions of the connecting plates 4. The arrangement of the plurality of grooves 161 is equivalent to forming a series of reinforcing ribs extending along the first direction X on the base plate 16, thereby improving the structural strength of the base plate 16. At the same time, it works in coordination with the plurality of connecting plates 4 extending along the first direction X to further optimize the overall structural strength of the battery pack.

[0065] In some embodiments of this application, such as Figure 9 As shown, the battery pack also includes a support plate 5, which extends along a first direction X. Multiple support plates 5 are provided, spaced apart along a second direction Y. The support plates 5 are located between the first plate 2 and the base plate 16. In the third direction Z, one side of the support plate 5 is connected to the first plate 2, and the other side is connected to the base plate 16. The connection between the support plate 5 and the first plate 2 and the base plate 16 includes, but is not limited to, adhesive bonding. The support plates 5 correspond to the positions of the connecting plates 4. In this embodiment, the support plates 5, spaced apart along the second direction Y, provide support for the first plate 2. The weight of the individual battery 31 is transferred to the first plate 2 at the position corresponding to the connecting plate 4 through the connecting plate 4. The support plates 5 are positioned at the corresponding positions of the connecting plates 4, thus working together with the first plate 2 to support the connecting plate 4, improving the load-bearing capacity of the first plate 2 on the battery pack 3 and enhancing the overall structural strength of the battery pack.

[0066] In some embodiments of this application, such as Figure 9 As shown, the connecting plate 4 has a cavity 41 inside, which extends in the first direction X. The cavity 41 can reduce the weight of the connecting plate 4 to a certain extent, thereby significantly improving the weight reduction of the entire battery pack.

[0067] In some embodiments of this application, such as Figure 9 As shown, in the second direction Y, through holes 42 are provided on both sides of the connecting plate 4, and the through holes 42 connect the outside and the cavity 41, as shown. Figure 2 As shown, multiple through holes 42 are spaced apart along the first direction X. The through holes 42 allow coolant to enter the cavity 41 through the through holes 42, thereby increasing the contact area between the coolant and the connecting plate 4. Since the connecting plate 4 is in contact with the individual battery 31, the heat generated by the individual battery 31 is transferred to the connecting plate 4. Due to the through holes 42, the coolant can enter the cavity 41 when flowing in the liquid cooling cavity 11, increasing the contact area between the coolant and the connecting plate 4, improving the efficiency of heat transfer from the connecting plate 4 to the coolant, and thus improving the heat exchange efficiency of the battery pack.

[0068] In some embodiments of this application, such as Figure 10 As shown, the pressure relief chamber 12 includes a first sub-cavity 121, a second sub-cavity 122, and a third sub-cavity 123; in the third direction Z, the first sub-cavity 121 is formed in the region corresponding to the projection of the pressure relief chamber 12 and the first plate 2; as shown... Figure 11 As shown, the space between the third side beam 143 and the first inner beam 151 forms the second sub-cavity 122, and the space between the fourth side beam 144 and the second inner beam 152 forms the third sub-cavity 123. In the first direction X, the second sub-cavity 122 and the third sub-cavity 123 are located on both sides of the liquid cooling cavity 11, and both the second sub-cavity 122 and the third sub-cavity 123 are connected to the first sub-cavity 121. When the single cell 31 experiences thermal runaway, the high-temperature gas discharged will first enter the pressure relief cavity 12, and move with the exhaust groove 212 to the second sub-cavity 122 and the third sub-cavity 123 located on both sides. The second sub-cavity 122 and / or the third sub-cavity 123 are connected to an exhaust valve 8 for venting to the outside. The exhaust valve 8 automatically opens when the pressure in the pressure relief cavity 12 reaches a preset value to release pressure to the outside, ultimately allowing the high-temperature gas to be discharged to the outside of the battery pack through the exhaust valve 8, thus preventing the battery pack from experiencing thermal runaway. The high-temperature gas generated by thermal runaway is effectively and quickly discharged from the battery pack through exhaust valve 8, reducing the probability of thermal propagation inside the battery pack and improving the safety of the battery pack.

[0069] Secondly, embodiments of this application provide an electrical device, including the battery pack described in the above embodiments. The electrical device can be a vehicle, ship, power tool, etc. The vehicle can be a new energy vehicle, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. Embodiments of this application do not impose special limitations on the above-mentioned electrical device.

[0070] In summary, this utility model embodiment provides a battery pack. This solution divides the internal space of the housing 1 into a liquid cooling chamber 11 and a pressure relief chamber 12 by setting a first plate 2 inside the housing 1. The battery pack 3 is housed within the liquid cooling chamber 11. The first plate 2 includes a main body 22 and multiple first protrusions 21, which act as reinforcing ribs, effectively strengthening the overall structural strength of the first plate 2. While meeting the venting requirements during thermal runaway of the battery pack, this allows the main structure of the battery pack to withstand the circulating pressure of the coolant circulating at a high flow rate within the liquid cooling chamber 11, thus ensuring that the coolant can circulate at a high flow rate within the liquid cooling chamber 11. The flow is improved to enhance the heat exchange efficiency of the battery pack. A weak zone 211 is provided on the first protrusion 21 and / or the main body 22. The weak zone is opposite to the explosion-proof valve of the battery cell 31 of the battery pack 3. When thermal runaway occurs inside the battery cell 31, the thermal runaway fluid enters the pressure relief chamber 12 through the weak zone 211 and is discharged outward from the pressure relief chamber 12. At the same time, the connection plate 4 is provided in the liquid cooling chamber 11 and the support plate 5 is provided in the pressure relief chamber 12 to further improve the overall structural strength of the battery pack, further improve the circulating pressure that the battery pack can withstand when the coolant flows at a high circulation rate during normal operation, and further improve the heat exchange efficiency of the battery pack.

[0071] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present utility model, and these improvements and substitutions should also be considered within the protection scope of the present utility model.

Claims

1. A battery pack having intersecting first directions (X), second directions (Y), and third directions (Z), characterized in that, include: The casing (1), the battery pack (3), and the first plate (2); The housing (1) has a receiving cavity, the first plate (2) is disposed in the receiving cavity, and the receiving cavity is divided into a liquid cooling cavity (11) and a pressure relief cavity (12); in the third direction (Z), the liquid cooling cavity (11) is located on one side of the pressure relief cavity (12); The battery pack (3) is housed in the liquid cooling cavity (11). The battery pack (3) includes multiple individual cells (31). Each individual cell (31) includes a cell body (311) and an explosion-proof valve (312). The explosion-proof valve (312) is connected to the cell body (311) on the side of the third direction (Z) near the first plate (2). The first plate (2) includes a body part (22) and a plurality of first protrusions (21), the plurality of first protrusions (21) extending along the first direction (X), and the plurality of first protrusions (21) being spaced apart along the second direction (Y); The first plate (2) also includes a weak area (211) disposed on the body portion (22) and / or the first protrusion portion (21); in the third direction (Z), the weak area (211) is at least partially opposite to the explosion-proof valve; the weak area (211) is configured to be ruptured by the high-pressure fluid in the single cell (31) and connected to the pressure relief chamber (12) when the high-pressure fluid in the single cell (31) ruptures the explosion-proof valve (312).

2. The battery pack according to claim 1, characterized in that, The weak area (211) is provided on the first protrusion (21).

3. The battery pack according to claim 2, characterized in that, On the third direction (Z), a plurality of the first protrusions (21) protrude toward the direction of the single cell (31); The battery pack also includes a connecting plate (4) extending along the first direction (X), the connecting plate (4) being disposed between two adjacent first protrusions (21), and there are multiple connecting plates (4), the multiple connecting plates (4) being spaced apart along the second direction (Y); In the third direction (Z), one side of the connecting plate (4) is fixedly connected to the side of the plurality of individual batteries (31) that are provided with explosion-proof valves (312), and the other side of the connecting plate (4) is fixedly connected to the main body (22).

4. The battery pack according to claim 2, characterized in that, On the third direction (Z), a plurality of the first protrusions (21) protrude toward the direction of the single cell (31); In the third direction (Z), the first protrusion (21) has an exhaust groove (212) on the side facing the pressure relief chamber (12). In the third direction (Z), the exhaust groove (212) has a slot (2121) and a groove wall (2122). The slot (2121) communicates with the pressure relief chamber (12), and the groove wall (2122) is opposite to the slot (2121). The weak area (211) is provided on the groove wall (2122).

5. The battery pack according to claim 4, characterized in that, The first plate (2) further includes a seal, the groove wall (2122) having an opening (21221) extending along the third direction (Z), the opening (21221) communicating with the vent groove (212), and the seal covering the opening (21221); in the third direction (Z), the area of ​​the seal opposite to the opening (21221) forms the weak area (211); the seal is configured to be ruptured by the high-pressure fluid in the single cell (31) and connected to the opening (21221) when the explosion-proof valve (312) is ruptured by the high-pressure fluid.

6. The battery pack according to claim 5, characterized in that, The sealing element includes a second plate (25); in the third direction (Z), the second plate (25) is disposed between the first plate (2) and the explosion-proof valve (312), and the second plate (25) is fitted and connected to the first plate (2); a portion of the second plate (25) protrudes along the third direction (Z) and toward the explosion-proof valve (312) to form a second protrusion (251); In the third direction (Z), the first protrusion (21) corresponds to the second protrusion (251).

7. The battery pack according to claim 3, characterized in that, Multiple individual cells (31) are arranged in multiple columns in the first direction (X) and in multiple rows in the second direction (Y); two adjacent individual cells (31) in the same column have a first support (314) and a second support (315), and the first support (314) and the second support (315) are connected to the connecting plate (4) on the side opposite to the first plate (2) in the third direction (Z).

8. The battery pack according to claim 3 or 7, characterized in that, The box body (1) also includes a cover (13), a box body side beam (14), a box body inner beam (15), and a bottom plate (16); The box-shaped side beam (14) includes a first side beam (141) and a second side beam (142) spaced apart along the second direction (Y), and a third side beam (143) and a fourth side beam (144) spaced apart along the first direction (X); The inner beam (15) of the box body includes a first inner beam (151) and a second inner beam (152) spaced apart along the first direction (X), and the first inner beam (151) and the second inner beam (152) are both located inside the box body (1); The first inner beam (151), the second inner beam (152), the first side beam (141), the second side beam (142), the cover (13), and the first plate (2) form the liquid cooling cavity (11); the first side beam (141), the second side beam (142), the third side beam (143), the fourth side beam (144), the bottom plate (16), and the first plate (2) form the pressure relief cavity (12).

9. The battery pack according to claim 8, characterized in that, The battery pack also includes a support plate (5) that extends along the first direction (X). There are multiple support plates (5), and the multiple support plates (5) are spaced apart along the second direction (Y). The support plate (5) is disposed between the first plate (2) and the bottom plate (16). In the third direction (Z), one side of the support plate (5) is connected to the first plate (2), and the other side of the support plate (5) is connected to the bottom plate (16). The support plate (5) corresponds to the position of the connecting plate (4).

10. The battery pack according to claim 3, characterized in that, The connecting plate (4) has a cavity (41) that extends within the connecting plate (4) along the first direction (X).

11. The battery pack according to claim 10, characterized in that, In the second direction (Y), through holes (42) are provided on both sides of the connecting plate (4), and the through holes (42) connect the liquid cooling cavity (11) and the cavity (41); the through holes (42) are provided at intervals along the first direction (X).

12. The battery pack according to claim 8, characterized in that, The pressure relief chamber (12) includes a first sub-chamber (121), a second sub-chamber (122), and a third sub-chamber (123); In the third direction (Z), the pressure relief chamber (12) and the area corresponding to the projection of the first plate (2) form the first sub-cavity (121); the space between the third side beam (143) and the first inner beam (151) forms the second sub-cavity (122), and the space between the fourth side beam (144) and the second inner beam (152) forms the third sub-cavity (123); both the second sub-cavity (122) and the third sub-cavity (123) are connected to the first sub-cavity (121); The second sub-cavity (122) and / or the third sub-cavity (123) are connected to an exhaust valve (8) for venting to the outside.

13. An electrical appliance, characterized in that, Includes the battery pack described in any one of claims 1-12.

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