Liquid cooling plate and battery pack

Abstract

The utility model belongs to the technical field of batteries, and discloses a liquid cooling plate and a battery pack, and the liquid cooling plate is used for being contacted with a battery cell and comprises a liquid cooling plate main body and a liquid cooling plate connecting part; the liquid cooling plate connecting part is connected and communicated with the liquid cooling plate main body, and the liquid cooling plate connecting part is used for connecting a liquid cooling pipeline; at least one mounting lug is arranged on the liquid cooling plate connecting part, the liquid cooling plate is connected to a box body through the mounting lug, a weak part is arranged on the liquid cooling plate main body, and the weak part is used for controlling a liquid cooling medium in the liquid cooling plate main body to flow out. According to the utility model, accurate cooling of thermal runaway of the battery cell at a large-area position is realized, local high temperature is effectively controlled, the temperature of the battery cell can be rapidly reduced, heat is prevented from diffusing to other battery cells, the spreading of thermal runaway is reduced, the risk of fire or explosion caused by thermal runaway of the battery cell is reduced, the safety of the whole battery pack is improved, and the service life of the battery is prolonged; and battery damage caused by thermal runaway is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and particularly relates to a liquid cooling plate and a battery pack. Background Art

[0002] When the existing battery cells experience thermal runaway, a spray cooling and fire extinguishing device is usually used to cool down and extinguish the fire at the thermal runaway position of the battery cells. However, since the spray device focuses on spraying a liquid cooling medium on the top of the battery cells or the spray nozzles of the battery cells, when the battery cells are relatively tall or wide, the spray device can only play a role in cooling down and extinguishing the fire at the top of the battery cells or the eruption ports of the battery cells. When the large surface of the battery cells experiences thermal runaway, due to the long distance from the spray nozzles of the spray device, accurate and timely cooling and fire extinguishing cannot be achieved, resulting in the continuous high temperature of other positions of the battery cells, which causes thermal runaway of other battery cells, leading to a chain reaction, affecting the safety of the entire battery pack. Moreover, untimely fire extinguishing of the battery cells will cause greater economic losses and increase the costs of maintenance and replacement of the battery. Summary of the Utility Model

[0003] The main purpose of the utility model is to provide a liquid cooling plate and a battery pack, aiming to solve the technical problem that the existing spray device cannot accurately and timely cool down and extinguish the fire when the battery cells experience thermal runaway.

[0004] To achieve the above-mentioned utility model purpose, the utility model provides a liquid cooling plate for contacting with battery cells, which includes a liquid cooling plate main body and a liquid cooling plate connecting portion;

[0005] The liquid cooling plate connecting portion is connected to and communicated with the liquid cooling plate main body, and the liquid cooling plate connecting portion is used for connecting a liquid cooling pipeline;

[0006] At least one mounting ear is arranged on the liquid cooling plate connecting portion, and the liquid cooling plate is connected to a box body through the mounting ear. A weak portion is arranged on the liquid cooling plate main body, and the weak portion is used for controlling the outflow of the liquid cooling medium in the liquid cooling plate main body.

[0007] Further, a liquid cooling inlet and outlet is arranged on the liquid cooling plate connecting portion, the liquid cooling inlet and outlet penetrates through the liquid cooling plate connecting portion and is communicated with the liquid cooling plate connecting portion.

[0008] Further, the liquid cooling plate connecting portion includes a first connecting portion and a second connecting portion. The first connecting portion and the second connecting portion are oppositely arranged at the end of the liquid cooling plate main body. The liquid cooling inlet and outlet includes a first inlet and outlet and a second inlet and outlet, and the first inlet and outlet and the second inlet and outlet are arranged on the first connecting portion or the second connecting portion.

[0009] Further, a connection platform is provided at one end of the liquid cooling plate connection portion. A liquid cooling inlet / outlet column extending away from the liquid cooling plate connection portion is provided on the connection platform and is in communication with the liquid cooling plate connection portion.

[0010] Further, the liquid cooling plate connection portion includes a third connection portion and a fourth connection portion. The third connection portion and the fourth connection portion are oppositely arranged at the end of the liquid cooling plate main body. The liquid cooling inlet / outlet column includes a first inlet / outlet column and a second inlet / outlet column. The first inlet / outlet column and the second inlet / outlet column are respectively arranged on the third connection portion and the fourth connection portion.

[0011] Further, there are multiple weak portions, and the multiple weak portions are arranged in an array on the liquid cooling plate main body.

[0012] Further, the weak portion is a through hole. A packaging film corresponding to the through hole is provided on the liquid cooling plate main body, and the packaging film covers the opening of the through hole to package the liquid cooling medium.

[0013] Further, the weak portion is a groove. The groove is provided on the liquid cooling plate main body and is recessed inward, and the wall thickness of the groove is smaller than the wall thickness of the liquid cooling plate main body.

[0014] The present utility model provides a battery pack, which includes the liquid cooling plate according to any one of the above embodiments, and further includes a box body and a battery cell stack.

[0015] There are multiple liquid cooling plates, and the multiple liquid cooling plates are arranged at intervals in the box body to form battery cell compartments, and the battery cell stack is arranged in the battery cell compartments.

[0016] Further, the battery pack further includes a battery cell stack cover plate. The battery cell stack cover plate is arranged on the battery cell stack, and cover plate exhaust holes are provided on the battery cell stack cover plate, and the multiple cover plate exhaust holes are arranged in an array.

[0017] Further, the first long side of the liquid cooling plate close to the battery cell stack cover plate is connected to the battery cell stack cover plate through a thermally conductive structural adhesive, and the second long side of the liquid cooling plate close to the box body is connected to the box body through the thermally conductive structural adhesive.

[0018] Further, the battery pack further includes a box cover arranged on the side of the battery cell stack cover plate away from the battery cell stack. The box cover is connected to the box body, and a convex portion protruding away from the battery cell stack cover plate is provided on the box cover.

[0019] Advantageous effects:

[0020] A liquid cooling plate of the present utility model is used to contact with an electric core, and includes a liquid cooling plate main body and a liquid cooling plate connecting portion; the liquid cooling plate connecting portion is connected and communicated with the liquid cooling plate main body, and the liquid cooling plate connecting portion is used to connect a liquid cooling pipeline; at least one mounting ear is arranged on the liquid cooling plate connecting portion, and the liquid cooling plate is connected to a box body through the mounting ear. A weak portion is arranged on the liquid cooling plate main body, and the weak portion is used to control the outflow of the liquid cooling medium in the liquid cooling plate main body. Therefore, by arranging the weak portion on the large surface side of the liquid cooling plate main body that fits the electric core, when the electric core has a thermal runaway, the weak portion is damaged by the thermal runaway heat flow impact, so that the liquid cooling medium in the liquid cooling pipeline flows out from the weak portion at a fixed point, realizing precise cooling of the thermal runaway of the electric core at the large surface position, effectively controlling the local high temperature, and by releasing the liquid cooling medium at a fixed point, the temperature of the electric core can be quickly reduced, preventing the heat from spreading to other electric cores, reducing the spread of thermal runaway. At the same time, through timely cooling measures, the risk of fire or explosion caused by the thermal runaway of the electric core is reduced, the safety of the entire battery pack is improved, the service life of the battery is extended, the battery damage caused by thermal runaway is reduced, and the cost of maintaining and replacing the battery is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the overall structure of the liquid cooling plate according to an embodiment of the present utility model;

[0022] Figure 2 According to an embodiment of the present utility model Figure 1 Partial schematic diagram;

[0023] Figure 3 Schematic diagram of the overall structure of the liquid cooling plate according to another embodiment of the present utility model;

[0024] Figure 4 According to another embodiment of the present utility model Figure 3 Partial schematic diagram;

[0025] Figure 5 Partial schematic diagram of the weak portion being a groove according to still another embodiment of the present utility model;

[0026] Figure 6 Schematic diagram of the overall structure of the battery pack according to an embodiment of the present utility model;

[0027] Figure 7 According to an embodiment of the present utility model Figure 6 Partial schematic diagram at position A;

[0028] Figure 8 According to an embodiment of the present utility model Figure 6 Top view;

[0029] Figure 9 According to an embodiment of the present utility model Figure 8Cross-sectional view at K-K;

[0030] Figure 10 For an embodiment of the present utility model Figure 9 Partial schematic view at position B.

[0031] Wherein:

[0032] 100, liquid cooling plate;

[0033] 1. Liquid cooling plate main body; 2. Liquid cooling plate connection part; 3. Weak part; 4. Liquid cooling inlet and outlet; 5. Connection platform; 6. Liquid cooling inlet and outlet column; 7. Box body; 8. Battery cell stack; 9. Installation ear; 10. Battery cell stack cover plate; 11. Cover plate exhaust hole; 12. Box cover; 13. Protrusion; 14. Installation table; 15. Fastening bolt;

[0034] 20. First connection part; 21. Second connection part;

[0035] 40. First inlet and outlet; 41. Second inlet and outlet;

[0036] 22. Third connection part; 23. Fourth connection part;

[0037] 60. First inlet and outlet column; 61. Second inlet and outlet column.

[0038] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0039] It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0040] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present utility model, "a plurality" means two or more unless otherwise specifically defined.

[0041] In the description of the present utility model, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

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

[0043] Referring to Figures 1 - 4 , this embodiment provides a liquid cooling plate 100 for contacting with an electric core, which includes a liquid cooling plate main body 1 and a liquid cooling plate connection part 2;

[0044] The liquid cooling plate connection part 2 is connected to and communicates with the liquid cooling plate main body 1, and the liquid cooling plate connection part 2 is used for connecting a liquid cooling pipeline;

[0045] At least one mounting ear 9 is provided on the liquid cooling plate connection part 2, and the liquid cooling plate 100 is connected to a box body through the mounting ear 9. A weak part 3 is provided on the liquid cooling plate main body 1, and the weak part 3 is used for controlling the outflow of the liquid cooling medium in the liquid cooling plate main body 1.

[0046] In the above embodiment, the liquid cooling plate 100 is mainly used to contact the battery cell, so that the liquid cooling plate 100 transfers the heat generated by the battery cell during charging and discharging to the liquid cooling medium through the contact surface with the battery cell. The liquid cooling medium includes, but is not limited to, deionized water, ethylene glycol aqueous solution or other special cooling liquids. The liquid cooling plate 100 includes a liquid cooling plate main body 1 and a liquid cooling plate connecting portion 2. The liquid cooling plate connecting portion 2 is arranged at the end of the liquid cooling plate main body 1, that is, a liquid cooling plate connecting portion 2 is arranged at each end of the liquid cooling plate main body 1, so that the liquid cooling plate connecting portion 2 is connected to the liquid cooling plate main body 1. The liquid cooling plate connecting portion 2 is used to connect the liquid cooling pipeline, and the liquid cooling plate connecting portion 2 and the liquid cooling plate main body 1 are in a communicating state, ensuring that the liquid cooling medium in the liquid cooling pipeline smoothly flows into the liquid cooling plate main body 1 through the liquid cooling plate connecting portion 2. In addition, when the liquid cooling plate 100 is placed in the box, its placement method is preferably vertical placement, that is, the liquid cooling plate 100 is perpendicular to the bottom plate of the box. At least one mounting ear 9 is arranged on each liquid cooling plate connecting portion 2, that is, the liquid cooling plate 100 is connected to the box through the mounting ears 9 at both ends of the liquid cooling plate 100, and the mounting ear 9 is arranged at the middle position of the short side of the entire liquid cooling plate 100, so that the liquid cooling plate 100 is fixedly connected to the mounting table 14 of the box through the mounting ear 9. The fixed connection method is preferably through the fastening bolt 15. The mounting ear 9 provides a fixed point, ensuring the stable position of the liquid cooling plate 100 in the box and preventing displacement caused by vibration or thermal expansion. A weak portion 3 is arranged on the liquid cooling plate main body 1. When the battery cell contacts the liquid cooling plate 100, the large surface of the battery cell is mutually attached to the side surface of the liquid cooling plate main body 1 where the weak portion 3 is arranged. A plurality of weak portions 3 are arranged on the liquid cooling plate main body 1, and the plurality of weak portions 3 are arranged in an array on the liquid cooling plate main body 1. The plurality of weak portions 3 can provide a plurality of release points when the battery cell has a thermal runaway, helping to prevent the spread of the thermal runaway to adjacent battery cells, and the array-arranged weak portions 3 help to more evenly distribute the liquid cooling medium, thereby achieving a more consistent cooling effect on the entire surface of the liquid cooling plate 100. Among them, the weak portion 3 can be damaged by the heat flow impact generated during the thermal runaway of the battery cell, so that the inside and outside of the liquid cooling plate main body 1 are conducted through the weak portion 3, so that the liquid cooling medium in the liquid cooling pipeline flows out from the position of the weak portion 3 at a fixed point. Therefore, by arranging the weak portion 3 on the side of the liquid cooling plate main body 1 that fits the large surface of the battery cell, when the battery cell has a thermal runaway, the weak portion 3 is damaged by the heat flow impact of the thermal runaway, so that the liquid cooling medium in the liquid cooling pipeline flows out from the weak portion 3 at a fixed point, realizing precise cooling of the thermal runaway of the battery cell at the large surface position, effectively controlling the local high temperature, and by releasing the liquid cooling medium at a fixed point, the temperature of the battery cell can be quickly reduced, preventing the heat from spreading to other battery cells, reducing the spread of the thermal runaway. At the same time, through timely cooling measures, the risk of fire or explosion caused by the thermal runaway of the battery cell is reduced, the safety of the entire battery pack is improved, the service life of the battery is extended, the battery damage caused by the thermal runaway is reduced, and the cost of maintaining and replacing the battery is reduced.

[0047] Refer toFigures 1 - 2 In one embodiment, a liquid cooling inlet / outlet 4 is provided on the liquid cooling plate connection part 2. The liquid cooling inlet / outlet 4 penetrates through the liquid cooling plate connection part 2 and is in communication with the liquid cooling plate connection part 2.

[0048] In the above embodiment, a liquid cooling inlet / outlet 4 with a hollow structure is provided on the liquid cooling plate connection part 2. The liquid cooling inlet / outlet 4 is used to connect a liquid cooling pipeline, and the liquid cooling inlet / outlet 4 is disposed through the liquid cooling plate connection part 2, so that the liquid cooling inlet / outlet 4 is symmetric on both sides of the liquid cooling plate connection part 2. At the same time, the liquid cooling inlet / outlet 4 is in communication with the liquid cooling plate connection part 2. When the liquid cooling medium in the liquid cooling pipeline flows into the liquid cooling plate 100 through the liquid cooling inlet / outlet 4, it helps to achieve the balance of the flow of the liquid cooling medium, avoid the difference in cooling efficiency caused by uneven flow, and ensure that when the battery cell is attached to the liquid cooling plate 100, each part of the battery cell can obtain appropriate cooling by more evenly distributing the liquid cooling medium.

[0049] Refer to Figures 1 - 2 In one embodiment, the liquid cooling plate connection part 2 includes a first connection part 20 and a second connection part 21. The first connection part 20 and the second connection part 21 are oppositely arranged at the end of the liquid cooling plate main body 1. The liquid cooling inlet / outlet 4 includes a first inlet / outlet 40 and a second inlet / outlet 41. The first inlet / outlet 40 and the second inlet / outlet 41 are provided on the first connection part 20 or the second connection part 21.

[0050] In the above embodiment, the liquid cooling plate connection part 2 includes a first connection part 20 and a second connection part 21. The first connection part 20 and the second connection part 21 have the same size, and the first connection part 20 and the second connection part 21 are arranged opposite to the ends of the liquid cooling plate main body 1, that is, the first connection part 20 and the second connection part 21 are symmetrically arranged at both ends of the liquid cooling plate main body 1 respectively. And the liquid cooling plate main body 1 is preferably rectangular. The heights of the first connection part 20 and the second connection part 21 are the same as the height of the liquid cooling plate main body 1, so that the tops and bottoms of the first connection part 20 and the second connection part 21 are respectively on the same horizontal plane as the top and the bottom plate of the liquid cooling plate main body 1, which helps to reduce the complexity during installation and ensure the smooth flow of the liquid cooling medium. In addition, the liquid cooling inlets and outlets 4 include a first inlet and outlet 40 and a second inlet and outlet 41. Among them, the first inlet and outlet 40 is the water inlet, and the second inlet and outlet 41 is the water outlet, or it can also be that the second inlet and outlet 41 is the water inlet and the first inlet and outlet 40 is the water outlet. At the same time, the first inlet and outlet 40 and the second inlet and outlet 41 are arranged on the first connection part 20, or the first inlet and outlet 40 and the second inlet and outlet 41 are arranged on the second connection part 21, that is, the first inlet and outlet 40 and the second inlet and outlet 41 are located at the same end of the liquid cooling plate 100, and the first inlet and outlet 40 and the second inlet and outlet 41 are arranged vertically on the liquid cooling plate connection part 2. When the first inlet and outlet 40 is the water inlet and the second inlet and outlet 41 is the water outlet, the liquid cooling medium flows into the liquid cooling plate 100 from the first inlet and outlet 40, then forms a U-shaped flow path in the liquid cooling plate 100, and finally flows out from the second inlet and outlet 41. The U-shaped flow design can reduce the dead zone inside the liquid cooling plate 100 and ensure that the entire liquid cooling plate 100 can be effectively cooled. And the first connection part 20 or the second connection part 21 is centrally arranged at the same end of the liquid cooling plate 100, reducing the required space, making the entire cooling system more compact, contributing to the miniaturization of the battery pack, while simplifying the pipeline connection, reducing the pipeline length and the number of elbows, and reducing the wiring complexity.

[0051] Referring to Figures 3 - 4 , in an embodiment, a connection platform 5 is provided at one end of the liquid cooling plate connection part 2. A liquid cooling inlet and outlet column 6 extending away from the liquid cooling plate connection part 2 is provided on the connection platform 5 and is communicated with the liquid cooling plate connection part 2.

[0052] In the above embodiments, a connection platform 5 is formed at one end of the liquid cooling plate connection part 2, and the connection platform 5 extends along the entire length direction of the liquid cooling plate connection part 2, so that a height difference is formed between the top end of the liquid cooling plate connection part 2 and the top end of the liquid cooling plate body 1, that is, the height of the liquid cooling plate connection part 2 is less than the height of the liquid cooling plate body 1. In addition, a liquid cooling inlet and outlet column 6 with a hollow structure is arranged on the connection platform 5, wherein the liquid cooling inlet and outlet column 6 is used for connecting a liquid cooling pipeline, the liquid cooling inlet and outlet column 6 and the liquid cooling plate connection part 2 are in a communicating state, and the liquid cooling inlet and outlet column 6 extends upward by a certain height in a direction away from the liquid cooling plate connection part 2. At the same time, the height of the liquid cooling inlet and outlet column 6 is less than or equal to the height of the height difference between the top end of the liquid cooling plate connection part 2 and the top end of the liquid cooling plate body 1, which helps to realize the compactness of the entire liquid cooling plate 100 structure, saves space, especially in applications with limited space. The compact design of the liquid cooling plate 100 facilitates the operation when connecting the liquid cooling pipeline and improves the convenience of installation.

[0053] Referring to Figures 3 - 4 , in one embodiment, the liquid cooling plate connection part 2 includes a third connection part 22 and a fourth connection part 23. The third connection part 22 and the fourth connection part 23 are oppositely arranged at the end of the liquid cooling plate body 1. The liquid cooling inlet and outlet column 6 includes a first inlet and outlet column 60 and a second inlet and outlet column 61. The first inlet and outlet column 60 and the second inlet and outlet column 61 are respectively arranged on the third connection part 22 and the fourth connection part 23.

[0054] In the above embodiments, the liquid cooling plate connection part 2 includes a third connection part 22 and a fourth connection part 23. The third connection part 22 and the fourth connection part 23 have the same dimensions, so that the third connection part 22 and the fourth connection part 23 are oppositely arranged at the ends of the liquid cooling plate body 1. The liquid cooling plate body 1 is preferably rectangular. The third connection part 22 and the fourth connection part 23 are respectively symmetrically arranged at both ends of the long sides on both sides of the liquid cooling plate body 1. In addition, the liquid cooling inlet and outlet column 6 includes a first inlet and outlet column 60 and a second inlet and outlet column 61. Among them, the first inlet and outlet column 60 is the water inlet, and the second inlet and outlet column 61 is the water outlet. Or it is also possible to make the first inlet and outlet column 60 the water outlet and the second inlet and outlet column 61 the water inlet. The first inlet and outlet column 60 is arranged on the third connection part 22, and the second inlet and outlet column 61 is arranged on the fourth connection part 23. That is, the first inlet and outlet column 60 and the second inlet and outlet column 61 are respectively arranged on the third connection part 22 and the fourth connection part 23 at both ends of the liquid cooling plate body 1, so that the first inlet and outlet column 60 and the second inlet and outlet column 61 are arranged at both ends on the liquid cooling plate 100. When the first inlet and outlet column 60 is the water inlet and the second inlet and outlet column 61 is the water outlet, the liquid cooling medium flows into the liquid cooling plate 100 from the first inlet and outlet column 60, and then forms a straight or S-shaped flow path in the liquid cooling plate 100, and finally flows out from the second inlet and outlet column 61. The straight or S-shaped flow path helps the liquid cooling medium to contact the liquid cooling plate 100 more evenly. The liquid cooling medium enters from one end and leaves from the other end, increasing the contact time and surface area of the liquid cooling medium with the liquid cooling plate 100, thereby improving the heat exchange efficiency. The arrangement of the first inlet and outlet column 60 and the second inlet and outlet column 61 with one in and one out at both ends of the liquid cooling plate 100 makes the installation and maintenance work of the liquid cooling plate 100 more convenient and improves the work efficiency of installation and maintenance.

[0055] Referring to Figures 1 - 4 , in one embodiment, the weak part 3 is a through hole, and a packaging film corresponding to the through hole is arranged on the liquid cooling plate body 1, and the packaging film covers the opening of the through hole to package the liquid cooling medium.

[0056] In the above embodiments, the weak part 3 is preferably a through hole. A packaging film is arranged on the liquid cooling plate body 1, and the packaging film is arranged corresponding to the through hole. The packaging film includes but is not limited to mica sheets and rubber tapes. By attaching to the opening of the through hole to package the liquid cooling medium in the liquid cooling plate 100, it is ensured that when the battery cell is in normal use, the packaging film maintains a stable sealing effect, so that the liquid cooling medium in the liquid cooling plate 100 will not flow out from the through hole, and the liquid cooling plate 100 maintains a stable cooling effect. When the battery cell undergoes thermal runaway, the hot air flow generated by the thermal runaway of the battery cell impacts and damages the packaging film on the through hole, so that the cold liquid medium can flow out from the through hole. And because the through hole is designed in the hot spot area of the battery cell, it is ensured that when thermal runaway occurs, the cold liquid medium directly flows to the position that most needs cooling, quickly releases the coolant, and then timely absorbs and disperses the heat generated by the battery cell, improving the cooling efficiency.

[0057] Reference Figures 5 - 6 In one embodiment, the weak part 3 is a groove, which is arranged on the liquid cooling plate body 1 and recesses inward, and the wall thickness of the groove is smaller than that of the liquid cooling plate body 1.

[0058] In the above embodiment, the weak part 3 is preferably a groove, and the groove is on the liquid cooling plate body 1 and recesses into the interior of the liquid cooling plate body 1. When the groove recesses, a smooth inclined curve transition zone is formed between the bottom of the groove and the surface of the liquid cooling plate 100, which helps to reduce stress concentration and avoid premature rupture caused by stress concentration. At the same time, the wall thickness of the bottom of the groove is smaller than that of the liquid cooling plate body 1, ensuring that when the battery cell is in normal use, the groove maintains a stable sealing effect, so that the liquid cooling medium will not flow out of the liquid cooling plate 100 from the groove, and the liquid cooling plate 100 maintains a stable cooling effect. When the battery cell undergoes thermal runaway, the hot air flow generated by the thermal runaway of the battery cell impacts and destroys the bottom of the groove, so that the cold liquid medium can flow out of the groove. And because the groove is designed in the hot spot area of the battery cell, it is ensured that when thermal runaway occurs, the cold liquid medium directly flows to the position most in need of cooling, quickly releases the coolant, and then timely absorbs and disperses the heat generated by the battery cell, improving the cooling efficiency.

[0059] Reference Figures 1 - 10 The present invention provides a battery pack, which includes the liquid cooling plate 100 described in any of the above embodiments, and further includes a box body 7 and a battery cell stack 8;

[0060] There are multiple liquid cooling plates 100, and the multiple liquid cooling plates 100 are arranged at intervals in the box body 7 to form a battery cell bin, and the battery cell stack 8 is arranged in the battery cell bin.

[0061] In the above embodiment, the battery pack includes a liquid cooling plate 100, and further includes a box body 7 and a battery cell stack 8. Among them, there are multiple liquid cooling plates 100, and the liquid cooling plates 100 are of a thin plate type design. The multiple liquid cooling plates 100 are arranged at intervals in the box body 7. At the same time, the multiple liquid cooling plates 100 form a battery cell bin in the box body 7 for accommodating the battery cell stack 8, so that the battery cell stack 8 is attached to the liquid cooling plate 100. The battery cell stack 8 is formed by stacking multiple battery cells, ensuring that the large surface of the battery cell is attached to the side surface of the liquid cooling plate 100 provided with the weak part 3, effectively improving the heat dissipation efficiency of the battery cell stack 8 and at the same time reducing the risk of thermal runaway of the battery cell stack 8.

[0062] Reference Figures 6 - 7 In one embodiment, the battery pack further includes a battery cell stack cover plate 10, the battery cell stack cover plate 10 is arranged on the battery cell stack 8, and a plurality of cover plate exhaust holes 11 are arranged on the battery cell stack cover plate 10, and the plurality of cover plate exhaust holes 11 are arranged in an array.

[0063] In the above embodiments, the battery pack further includes a stack cover plate 10 disposed on the battery cell stack 8. When the stack cover plate 10 is installed on the battery cell stack 8, it is connected to the end of the liquid cooling plate 100 away from the bottom plate of the box body 7. And the stack cover plate 10 is connected to the liquid cooling plate 100 through a heat-conducting adhesive. Therefore, the two long sides of the liquid cooling plate 100 are respectively connected to the stack cover plate 10 and the bottom plate of the box body 7, which improves the stability of the entire liquid cooling plate 100 while also helping to improve the stability of the entire battery cell stack 8 in the battery pack, reduces the displacement of internal components caused by vibration or impact, and improves the overall safety of the battery pack. In addition, a plurality of cover exhaust holes 11 are provided on the stack cover plate 10, and the plurality of cover exhaust holes 11 are arranged in an array. During the charging and discharging process of the battery cells, a certain amount of gas will be generated. Through the cover exhaust holes 11, these gases can be prevented from accumulating inside the battery cell stack 8, reducing the pressure. The gases generated by the battery cells can be discharged in time through the exhaust holes, which can reduce the risk of overheating or thermal runaway of the battery cells and improve the safety of the battery pack.

[0064] Furthermore, when the liquid cooling plate 100 is vertically placed in the box body, the two long sides of the liquid cooling plate 100 are respectively attached to the stack cover plate 10 and the bottom plate of the box body 7, and the battery cell stack 8 is also placed vertically in the battery cell compartment. That is, the first long side of the liquid cooling plate 100 close to the stack cover plate 10 is connected to the stack cover plate 10 through a heat-conducting structural adhesive, and the second long side of the liquid cooling plate 100 close to the box body 7 is connected to the box body 7 through a heat-conducting structural adhesive. Among them, the connection methods of the liquid cooling plate 100 to the stack cover plate 10 and the box body 7 are preferably through heat-conducting structural adhesives. At the same time, as a thermal interface material, the heat-conducting adhesive can fill the tiny gaps on the contact surface between the liquid cooling plate 100 and the box body 7, reduce the hard connection stress caused by thermal expansion or mechanical vibration, and extend the service life of the liquid cooling plate 100 and the box body 7.

[0065] Refer to Figures 6 - 7 , in one embodiment, the battery pack further includes a box cover 12 disposed on the side of the stack cover plate 10 away from the battery cell stack 8, and the box cover 12 is connected to the box body 7, and a convex portion 13 protruding away from the stack cover plate 10 is provided on the box cover 12.

[0066] In the above embodiments, the battery pack further includes a case cover 12, which is disposed on the side of the battery cell stack cover plate 10 away from the battery cell stack 8. The case cover 12 is fastened to the case body 7 by bolts, so that the case cover 12 and the case body 7 are combined to form the battery case of the battery pack. The liquid cooling plate 100, the battery cell stack 8 and the battery cell stack cover plate 10 are located inside the battery case. In addition, a convex portion 13 is provided on the case cover 12, and the convex portion 13 protrudes away from the battery cell stack cover plate 10, so that a height difference is formed between the case cover 12 and the battery cell stack cover plate 10, and a certain accommodation space is formed inside the case cover 12. The gas generated by the battery cells can temporarily store the gas in this accommodation space through the exhaust holes, reducing the pressure of the gas inside the battery pack. Moreover, the accommodation space can serve as a buffer zone to reduce the impact of the gas generated during the thermal runaway of the battery cells on the structure of the battery pack, ensuring the safety of the vehicle occupants in the cabin and the safety of the battery pack.

[0067] The above are only the preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, shall be similarly included in the patent protection scope of the present invention.

Claims

1. A liquid cooling plate for contacting an electric cell, characterized in that, It includes a liquid cooling plate body and a liquid cooling plate connection part; The liquid cooling plate connection part is connected and communicated with the liquid cooling plate body, and the liquid cooling plate connection part is used for connecting a liquid cooling pipeline; At least one mounting ear is provided on the liquid cooling plate connection part, and the liquid cooling plate is connected to the box body through the mounting ear. A weak part is provided on the liquid cooling plate body, and the weak part is used for controlling the outflow of the liquid cooling medium in the liquid cooling plate body.

2. The liquid cooling plate according to claim 1, wherein A liquid cooling inlet and outlet is provided on the liquid cooling plate connection part, and the liquid cooling inlet and outlet penetrates through the liquid cooling plate connection part and is communicated with the liquid cooling plate connection part.

3. The liquid cooling plate according to claim 2, characterized in that, The liquid cooling plate connection part includes a first connection part and a second connection part. The first connection part and the second connection part are oppositely arranged at the end of the liquid cooling plate body. The liquid cooling inlet and outlet includes a first inlet and outlet and a second inlet and outlet, and the first inlet and outlet and the second inlet and outlet are arranged on the first connection part or the second connection part.

4. The liquid cooling plate according to claim 1, characterized in that, A connection platform is provided at one end of the liquid cooling plate connection part. A liquid cooling inlet and outlet column extending away from the liquid cooling plate connection part is provided on the connection platform and is communicated with the liquid cooling plate connection part.

5. The liquid cooling plate according to claim 4, characterized in that, The liquid cooling plate connection part includes a third connection part and a fourth connection part. The third connection part and the fourth connection part are oppositely arranged at the end of the liquid cooling plate body. The liquid cooling inlet and outlet column includes a first inlet and outlet column and a second inlet and outlet column, and the first inlet and outlet column and the second inlet and outlet column are respectively arranged on the third connection part and the fourth connection part.

6. The liquid cooling plate according to any one of claims 1-5, characterized in that, There are multiple weak parts, and the multiple weak parts are arranged in an array on the liquid cooling plate body.

7. The liquid cooling plate according to claim 6, wherein The weak part is a through hole, and a packaging film corresponding to the through hole is provided on the liquid cooling plate body, and the packaging film covers the opening of the through hole to package the liquid cooling medium.

8. The liquid cooling plate according to claim 6, wherein, The weak part is a groove, and the groove is arranged on the liquid cooling plate body and is recessed inward, and the wall thickness of the groove is smaller than the wall thickness of the liquid cooling plate body.

9. A battery pack, comprising the liquid cooling plate according to any one of claims 1-8, characterized in that, It further includes a box body and a battery cell stack; There are multiple liquid cooling plates, and the multiple liquid cooling plates are arranged at intervals in the box body to form a battery cell bin, and the battery cell stack is arranged in the battery cell bin.

10. The battery pack according to claim 9, characterized in that, The battery pack further includes a battery cell stack cover plate, and the battery cell stack cover plate is arranged on the battery cell stack. Multiple cover plate exhaust holes are provided on the battery cell stack cover plate, and the multiple cover plate exhaust holes are arranged in an array.

11. The battery pack according to claim 10, characterized in that, The first long side of the liquid cooling plate close to the battery cell stack cover plate is connected to the battery cell stack cover plate through a thermally conductive structural adhesive, and the second long side of the liquid cooling plate close to the box body is connected to the box body through the thermally conductive structural adhesive.

12. The battery pack according to claim 10, characterized in that, The battery pack further includes a box cover arranged on the side of the battery cell stack cover plate away from the battery cell stack, and the box cover is connected to the box body, and a convex part protruding away from the battery cell stack cover plate is provided on the box cover.

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