Battery device, energy storage system and electrical equipment

Abstract

The present application relates to a battery device, energy storage system, and electrical equipment in the field of energy storage technology. The battery device includes a heat sink and multiple battery cells. The heat sink includes a first main body and multiple second main bodies. The first main body includes a cavity. One end of the second main body is located in the cavity, and the other end protrudes from the first main body. The multiple second main bodies are spaced apart along the length of the battery device to form a flow channel in the cavity. The battery cells are located on the surface of the first main body, and the second main bodies are located between adjacent battery cells to absorb the heat of the battery cells and improve the heat dissipation effect of the battery cells. The bottom of the cavity is provided with multiple recessed portions. The recessed portions are located between adjacent second main bodies and extend along the width direction of the battery device so that the extension direction of the recessed portions is the same as the flow direction of the coolant in the flow channel. The depth of the recessed portions gradually decreases from the middle position of the recessed portion to the direction of the end portion, thereby reducing the possibility of the generation of a flow dead zone and improving the heat dissipation effect of the heat sink.

Description

Technical Field

[0001] The present application relates to the field of energy storage technology, and in particular to a battery device, an energy storage system, and an electrical device. Background Art

[0002] The battery cells in a battery device generate heat during the charge and discharge process, causing the cell temperature to rise. If the cell temperature is not controlled, it may lead to reduced cell efficiency, shortened lifespan, or thermal runaway. The natural heat dissipation of the cell cannot maintain the temperature within the operating range, so a heat sink is necessary. Currently, the heat sink in a battery device is an aluminum liquid cooling plate with a serpentine flow channel inside. Coolant flows through the channel, and the battery cell is located on the surface of the liquid cooling plate so that the liquid cooling plate absorbs the heat generated by the cell. The liquid cooling plate is attached to the lower surface of the cell, resulting in poor heat dissipation effect of the liquid cooling plate on the upper end of the cell, which has a negative impact on the cell lifespan. Summary of the Invention

[0003] The present application provides a battery device, an energy storage system, and an electrical device for solving the problem of poor heat dissipation of battery cells in the battery device.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising:

[0005] a heat sink comprising a first main body and a plurality of second main bodies, the first main body comprising a cavity, the plurality of second main bodies being spaced apart along a length of the battery device, one end of each second main body being located within the cavity to form a flow channel within the cavity, and the other end of each second main body protruding from the first main body;

[0006] a plurality of battery cells, wherein the plurality of battery cells are located on a surface of the first main body portion, and the second main body portion is located between adjacent battery cells;

[0007] The bottom wall of the cavity has a plurality of recessed portions, and the recessed portions are located between the adjacent second main body portions. Along the width direction of the battery device, the depth of the recessed portions gradually decreases from the middle position of the recessed portions toward the end portions.

[0008] In a possible embodiment, the heat dissipation element includes a heat exchange tube, the heat exchange tube includes an evaporation portion and a condensation portion that are interconnected, the evaporation portion is embedded in the second main body portion, and the condensation portion is embedded in the first main body portion.

[0009] In a possible embodiment, the evaporation portion includes a plurality of first straight sections and a plurality of first bent sections, wherein the plurality of first straight sections extend along the height direction of the battery device and are spaced apart along the width direction of the battery device, and the first bent sections are located between adjacent first straight sections to connect adjacent first straight sections.

[0010] In a possible embodiment, the condensation portion includes a plurality of second straight sections and a plurality of second bent sections, the plurality of second straight sections are arranged at intervals along the length direction of the battery device, and the second bent sections are located between adjacent second straight sections to connect adjacent second straight sections; the second straight sections are connected to the first straight sections.

[0011] In a possible embodiment, the condensation portion is located on a side of the cavity away from the second main body portion; and the recessed portion is located between adjacent second straight sections.

[0012] In a possible embodiment, a ratio of a width of the recessed portion to a distance between adjacent second straight sections is 10% to 50%.

[0013] In a possible embodiment, the port of the heat exchange tube is located in the condensation part and protrudes from the first main body. The port has a sealing device. When the pressure in the heat exchange tube is greater than a preset range, the sealing device fails.

[0014] In a possible embodiment, the sealing device includes a sensor for detecting the pressure in the heat exchange tube, and when the pressure in the heat exchange tube is greater than a preset range, an alarm is sent to a management system of the battery device.

[0015] In a possible embodiment, along a height direction of the battery device, a size of the second main body portion is greater than or equal to a size of the battery cell.

[0016] In a possible embodiment, an insulating member is provided between the second main body and the battery core, and thermal conductive adhesive is provided on both sides of the insulating member.

[0017] In a second aspect, an embodiment of the present application further provides an energy storage system, which includes a plurality of battery devices, and the battery devices are any of the battery devices described above.

[0018] In a third aspect, an embodiment of the present application further provides an electrical device, wherein the electrical device includes a battery device to power the electrical device, and the battery device is any one of the battery devices described above.

[0019] The present application relates to a battery device, an energy storage system, and an electrical device. The battery device includes a heat sink and multiple battery cells. The heat sink includes a first main body and multiple second main bodies. The first main body includes a cavity. One end of the second main body is located in the cavity, and the other end protrudes from the first main body. The multiple second main bodies are spaced apart along the length of the battery device to form a flow channel in the cavity. The battery cells are located on the surface of the first main body, and the second main bodies are located between adjacent battery cells to absorb the heat of the battery cells and improve the heat dissipation effect of the battery cells. The bottom of the cavity is provided with multiple recessed portions. The recessed portions are located between adjacent second main bodies and extend along the width direction of the battery device so that the extension direction of the recessed portions is the same as the flow direction of the coolant in the flow channel. The depth of the recessed portions gradually decreases from the middle position of the recessed portion to the end direction, so that the cross-section of the recessed portion is an arc surface, which reduces the possibility of the generation of flow dead zones and can improve the heat dissipation effect of the heat sink. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] Figure 1 A schematic diagram of the structure of a battery device provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the internal structure of a battery device provided in an embodiment of the present application;

[0023] Figure 3 A schematic structural diagram of a heat sink provided in an embodiment of the present application;

[0024] Figure 4 A top view of a heat sink provided in an embodiment of the present application;

[0025] Figure 5 for Figure 4 Cross-sectional view in the AA direction;

[0026] Figure 6 for Figure 4 Cross-sectional view in the middle BB direction;

[0027] Figure 7 for Figure 4 Cross-sectional view in CC direction;

[0028] Figure 8 A side view of a heat sink provided in an embodiment of the present application;

[0029] Figure 9 for Figure 8Cross-sectional view in the middle DD direction;

[0030] Figure 10 for Figure 8 Cross-sectional view in the EE direction;

[0031] Figure 11 A schematic diagram of the structure of the heat exchange tube provided in an embodiment of the present application.

[0032] Reference numerals:

[0033] 1- heat sink;

[0034] 11- first main body;

[0035] 111- cavity;

[0036] 112-depression;

[0037] 113-liquid inlet;

[0038] 114-liquid outlet;

[0039] 12- second main body;

[0040] 13-heat exchange tube;

[0041] 131- evaporation section;

[0042] 131a-first straight section;

[0043] 131b-first bending section;

[0044] 132- condensation unit;

[0045] 132a-second straight section;

[0046] 132b- second bending section;

[0047] 133-port;

[0048] 2-battery cells;

[0049] 3- housing;

[0050] 31-upper housing;

[0051] 32-Lower housing. DETAILED DESCRIPTION

[0052] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0053] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0054] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0055] It should be understood that the term "and / or" as used herein simply describes a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A alone, A and B together, or B alone. Furthermore, the character " / " in this document generally indicates an "or" relationship between the associated objects.

[0056] like Figure 1 、 Figure 2 、 Figure 3 and Figure 4 As shown, an embodiment of the present application provides a battery device, including a housing 3, in which a plurality of battery cells 2 arranged in a matrix are disposed. The housing 3 includes an upper shell 31 and a lower shell 32. A heat sink 1 is disposed at the bottom of the lower shell 32, and the battery cells 2 are placed on the heat sink 1. The heat sink 1 includes a first main body 11 and multiple second main bodies 12. The first main body 11 includes a cavity 111. The multiple second main bodies 12 are spaced apart along the length direction X of the battery device, and one end of the second main body 12 is located within the cavity 111 to form a flow channel within the cavity 111. The first main body 11 is provided with a liquid inlet 113 and a liquid outlet 114. The liquid inlet 113 and the liquid outlet 114 are located at the front and end of the flow channel, respectively, and are connected to a liquid cooling unit, so that the coolant can flow from the liquid inlet 113 into the cavity 111, and can flow along the flow channel to the liquid outlet 114, and finally flow out of the first main body 11 through the liquid outlet 114. Multiple battery cells 2 are located on the surface of the first main body 11, and the bottom surfaces of the battery cells 2 are in contact with the surface of the first main body 11, so that the first main body 11 can absorb the heat from the bottom surfaces of the battery cells 2, reduce the temperature of the battery cells 2, and reduce the possibility of thermal runaway of the battery device.

[0057] The other end of the second body portion 12 protrudes from the first body portion 11, and multiple battery cells 2 are located between adjacent second body portions 12. The second body portion 12 contacts the sidewalls of the battery cells 2, absorbing heat from the sides of the battery cells 2 and transferring the heat to the coolant in the cavity 111.

[0058] The first main body 11 contacts the bottom wall of the battery cell 2, and the second main body 12 contacts the side wall of the battery cell 2, thereby increasing the contact area between the heat sink 1 and the battery cell 2, thereby improving the heat absorption effect of the heat sink 1, facilitating the maintenance of the temperature of the battery cell 2, and making the battery cell 2 operate within an appropriate temperature range, thereby increasing the service life of the battery cell 2.

[0059] The multiple battery cells 2 within the housing 3 are arranged in a matrix. Thus, along the width of the battery device, the multiple battery cells 2 can be arranged in battery packs, with multiple rows of battery packs spaced apart along the lengthwise direction X of the battery device. One side of the battery packs on either side of the lengthwise direction X contacts the housing 3, allowing the heat generated by them to be dissipated through the housing 3. As a result, during charging and discharging of the battery device, the temperature of the battery cells 2 in the middle is higher than that of the battery cells 2 at the edges. The second main body 12, located between adjacent groups of battery cells 2, absorbs the heat generated by the middle cells 2, ensuring a more balanced temperature across the multiple battery cells 2 within the battery device, thereby increasing the battery device's service life.

[0060] like Figure 5 、 Figure 6 and Figure 9 As shown, the bottom of the cavity 111 is provided with a plurality of recessed portions 112. The recessed portions 112 are located between adjacent second main body portions 12 and extend along the width direction Y of the battery device. Along the width direction of the battery device, the middle position of the recessed portion 112 points toward the end, and the depth of the recessed portion 112 gradually decreases, so that the cross-section of the recessed portion 112 is an arc surface.

[0061] The extension direction of the recessed portion 112 is the same as the flow direction of the coolant in the flow channel, and the cross-section of the recessed portion 112 is an arc surface, which facilitates the flow of the coolant in the flow channel, reduces the possibility of the generation of flow dead zones, can improve the heat dissipation effect of the heat sink 1, and can also reduce the load of the water pump in the liquid cooling unit.

[0062] like Figure 2 As shown, in a possible embodiment, the second main body portion 12 is located between adjacent battery cells 2 , and along the height direction of the battery device, the size of the second main body portion 12 is greater than or equal to the size of the battery cell 2 .

[0063] The side wall of the battery cell 2 contacts the second main body 12 so that the second main body 12 absorbs the heat generated by the battery cell 2. The height of the second main body 12 is greater than or equal to the height of the battery cell 2, which increases the contact area between the battery cell 2 and the second main body 12, thereby increasing the heat absorption efficiency of the second main body 12, which is beneficial to improving the heat dissipation efficiency of the heat sink 1.

[0064] During the charging and discharging process, the battery cell 2 generates less heat on the side close to the first main body 11, and generates more heat on the side away from the first main body 11. The height of the second main body 12 is greater than or equal to the height of the battery cell 2, so that the second main body 12 can contact the end of the battery cell 2 away from the first main body 11 to absorb the heat generated by the end of the battery cell 2 away from the first main body 11.

[0065] In a possible embodiment, an insulating member is provided between the second main body 12 and the battery core 2 .

[0066] The second main body 12 is an aluminum plate to improve the thermal conductivity of the second main body 12. However, aluminum is also conductive. When the second main body 12 is in direct contact with the battery cell 2, it may cause a short circuit of multiple battery cells 2 in the battery device. Providing an insulating member between the second main body 12 and the battery cell 2 can improve the safety of the battery device.

[0067] Thermally conductive adhesive is provided on both sides of the insulating member. The thermally conductive adhesive can bond the insulating member, the battery cell 2, and the second main body 12 to restrict the position of the battery cell 2 and the insulating member, reduce the possibility of displacement of the battery cell 2 and the insulating member, and improve the reliability of the battery device. The thermally conductive adhesive has a high thermal conductivity coefficient. The battery cell 2 and the insulating member are connected by the thermally conductive adhesive, which can reduce the possibility of a gap between the battery cell 2 and the insulating member and improve the thermal conductivity efficiency between the battery cell 2 and the insulating member. The insulating member is connected to the second main body 12 by the thermally conductive adhesive, which can reduce the possibility of a gap between the insulating member and the second main body 12 and improve the thermal conductivity efficiency between the insulating member and the second main body 12. In turn, it can improve the thermal conductivity efficiency between the second main body 12 and the battery cell 2, thereby improving the heat dissipation effect of the heat sink 1.

[0068] like Figure 7 、 Figure 10 and Figure 11 As shown, in a possible embodiment, the heat sink 1 includes a heat exchange tube 13, and the heat exchange tube 13 includes an evaporation portion 131 and a condensation portion 132 that are interconnected, wherein the evaporation portion 131 is embedded in the second main body portion 12, and the condensation portion 132 is installed in the first main body portion 11.

[0069] The heat exchange tube 13 is filled with a heat exchange medium. The evaporation portion 131 is embedded in the second main body 12 and can absorb heat from the second main body 12. The heat exchange medium in the evaporation portion 131 is heated and evaporates. Due to the capillary action in the heat exchange tube 13, the heat exchange medium can flow to the condensation portion 132. The condensation portion 132 is embedded in the first main body 11, so that the coolant in the cavity 111 of the first main body 11 can absorb the heat of the condensation portion 132, causing the heat exchange medium in the condensation portion 132 to condense. The flow of the heat exchange medium between the condensation portion 132 and the evaporation portion 131 can transfer the heat in the second main body 12 to the first main body 11, thereby improving the heat absorption capacity of the second main body 12 and thereby improving the heat dissipation effect on the battery cell 2. The heat in the heat exchange tube 13 is carried out of the heat sink 1 by the coolant.

[0070] like Figure 7 and Figure 11 As shown, in a possible embodiment, the evaporation portion 131 includes a plurality of first straight sections 131a and a plurality of first bent sections 131b. The first straight sections 131a extend along the height direction Z of the battery device and are spaced apart along the width direction Y. The first bent sections 131b are located between adjacent first straight sections 131a to connect adjacent first straight sections 131a, so that the evaporation portion 131 of the heat exchange tube 13 is arranged in a serpentine shape within the second main body 12.

[0071] The evaporation portion 131 is arranged in a serpentine shape in the second main body 12 , so that the heat exchange tubes 13 are arranged more densely in the second main body 12 , thereby improving the heat absorption effect of the second main body 12 on the battery core 2 and maintaining the battery core 2 at a suitable operating temperature.

[0072] In a possible embodiment, a distance between adjacent first straight sections 131 a in the evaporation portion 131 is less than or equal to 10 cm.

[0073] The evaporation portion 131 is embedded within the second main portion 12 to enhance its heat absorption. The spacing between adjacent first straight sections 131a is less than or equal to 10cm. This increases the proportion of the evaporation portion 131 within the second main portion 12, thereby improving the heat absorption capacity of the second main portion 12 and maintaining a suitable operating temperature for the battery cells 2. Therefore, the spacing between adjacent first straight sections 131a can be 3cm, 6cm, 10cm, or other suitable spacing.

[0074] In a possible embodiment, multiple second main body portions 12 are spaced apart along the length direction X of the battery device, and the spacing between adjacent first straight sections 131a in the second main body portion 12 located in the middle is smaller than the spacing between adjacent first straight sections 131a in the second main body portion 12 located at the edge, so that the proportion of the evaporation portion 131 in the second main body portion 12 located in the middle is higher than the proportion of the evaporation portion 131 in the second main body portion 12 located at the edge.

[0075] The heat generated by the battery cells 2 located at the edges during charging and discharging can be conducted out of the charging device through the housing. Therefore, during charging and discharging of the battery device, the temperature of the battery cells 2 located in the middle is higher than that of the battery cells 2 located at the edges. The proportion of the evaporation portion 131 in the second main body 12 located in the middle is higher than that in the second main body 12 located at the edges. This improves the heat absorption effect of the second main body 12 located in the middle, improves the heat dissipation effect of the battery cells 2 located in the middle, and makes the temperature of the multiple battery cells 2 in the battery device more balanced, thereby extending the service life of the battery device.

[0076] Along the width direction Y of the battery device, a portion of the heat generated by the battery cells 2 located at the edges during charging and discharging can be conducted out of the charging device through the housing. Therefore, during charging and discharging, the temperature of the battery cells 2 located in the middle is higher than that of the battery cells 2 at the edges. In one possible embodiment, along the width direction Y of the battery device, the spacing between adjacent first straight segments 131a located in the middle of the evaporation portion 131 embedded in the same second main body 12 is smaller than the spacing between first straight segments 131a located at the edges. This results in a greater heat absorption effect in the middle of the second main body 12 than at the edges, improving the heat dissipation of the battery cells 2 in the middle and achieving more balanced temperatures among the multiple battery cells 2 within the battery device, thereby increasing the battery device's service life.

[0077] like Figure 5 and Figure 10 As shown, in a possible embodiment, the condensation portion 132 is embedded in the first main body portion 11 and is located on a side of the cavity 111 away from the second main body portion 12 .

[0078] The coolant flows in the cavity 111, and under the action of gravity, the coolant contacts the inner wall of the cavity 111 on the side away from the second main body 12. The condensation part 132 is embedded in the side of the cavity 111 in the first main body 11 away from the second main body 12, which improves the heat conduction efficiency between the coolant and the condensation part 132 and facilitates the extraction of heat from the heat exchange tube 13.

[0079] The battery cell 2 is located on the side of the first main body 11 where the second main body 12 is provided, and the condensation portion 132 is embedded in the side of the cavity 111 in the first main body 11 away from the second main body 12, so that the condensation portion 132 and the battery cell 2 are respectively located on both sides of the cavity 111, so that the coolant in the cavity 111 can absorb both the heat generated by the battery cell and the heat of the condensation portion 132. At the same time, it can also reduce the possibility of the heat generated by the battery cell 2 being conducted to the condensation portion 132, which is beneficial to improving the heat dissipation effect of the condensation portion 132.

[0080] In one possible embodiment, the heat exchange tube 13 may be made of copper, which has a high thermal conductivity and can improve the heat exchange efficiency between the heat exchange tube 13 and the first and second main bodies 11, 12. The first and second main bodies 11, 12 may be made of aluminum or an aluminum alloy, which can improve the heat exchange efficiency between the first and second main bodies 11, 12 and the coolant and battery cells 2, thereby improving the heat dissipation effect on the battery cells 2. Using aluminum or an aluminum alloy with a low density for the first and second main bodies 11, 12 can also reduce the weight and production cost of the heat sink 1.

[0081] like Figure 10 and Figure 11 As shown, in a possible embodiment, the condensation portion 132 includes a plurality of second straight sections 132a and a plurality of second bent sections 132b, the second straight sections 132a extend along the width direction Y of the battery device and are spaced apart along the length direction X of the battery device, and the second bent sections 132b are located between adjacent second straight sections 132a to connect adjacent second straight sections 132a, so that the condensation portion 132 is arranged in a serpentine shape within the first main body 11.

[0082] The condenser section 132 is located on the side of the cavity 111 in the first main body 11 away from the second main body 12, and coolant flows into the cavity 111. The condenser section 132 is arranged in a serpentine pattern within the first main body 11, and the second straight sections 132a are spaced apart along the length direction X of the battery device. This improves the heat exchange between the condenser section 132 and the coolant. The coolant can quickly absorb the heat from the condenser section 132, reducing the temperature of the heat exchange medium within the condenser section 132. The second straight section 132a is connected to the first straight section 131a, allowing the heat exchange medium to flow between the evaporator section 131 and the condenser section 132. The lower temperature heat exchange medium can flow to the evaporator section 131, thereby improving the heat absorption effect of the evaporator section 131.

[0083] In a possible embodiment, the distance between adjacent second straight sections 132 a in the condensation portion 132 is less than or equal to 7 cm.

[0084] The condenser 132 is embedded in the first main body 11. Coolant is introduced into the cavity 111 of the first main body 11 to absorb heat from the condenser 132, thereby reducing the temperature of the heat exchange medium in the condenser 132. The spacing between adjacent second straight sections 132a is less than or equal to 7 cm, which increases the proportion of the condenser 132 in the first main body 11 and thereby improves the heat exchange efficiency between the coolant and the condenser 132, thereby improving the heat dissipation effect of the heat sink 1. Therefore, the spacing between adjacent second straight sections 132a can be 3 cm, 5 cm, 7 cm, etc.

[0085] like Figure 10 and Figure 11As shown, in a possible embodiment, at least two second straight sections 132 a are provided between two adjacent evaporation portions 131 .

[0086] The heat exchange medium in the evaporation section 131 absorbs heat and flows to the condensation section 132, where the heat is transferred to the coolant in the cavity 111. There are at least two second straight sections 132a between two adjacent evaporation sections 131, which can increase the contact area between the condensation section 132 and the first main body section 11, thereby improving the heat exchange efficiency between the condensation section 132 and the coolant.

[0087] like Figure 10 As shown, in a possible embodiment, the plurality of recessed portions 112 and the plurality of second straight sections 132a extend along the width direction Y of the battery device and are spaced apart along the length direction X of the battery device. The recessed portions 112 are located between adjacent second straight sections 132a.

[0088] The recessed portion 112 is located on the bottom wall of the cavity 111, and there is flowing coolant in the recessed portion 112. The second straight section 132a is located on the side of the first main body 11 where the recessed portion 112 is provided, so that the recessed portion 112 can extend between adjacent second straight sections 132a, so that the heat of the second straight sections 132a can be conducted from the side wall of the recessed portion 112 to the recessed portion 112, which can increase the contact area between the coolant and the second straight section 132a, and thus can improve the heat dissipation effect of the condensation portion 132.

[0089] like Figure 9 As shown, in a possible embodiment, along the width direction Y of the battery device, the length of the recessed portion 112 is greater than or equal to the length of the second straight section 132 a .

[0090] The condensation portion 132 is located on the side of the cavity 111 away from the second main body portion 12. Heat in the condensation portion 132 can be conducted from the bottom wall of the cavity 111 to the coolant in the cavity 111. Coolant also flows within the recessed portion 112. Heat within the second straight section 132a can also be conducted from the sidewalls of the recessed portion 112 to the coolant within the recessed portion 112, thereby enhancing the heat absorption effect on the condensation portion 132. The length of the recessed portion 112 is greater than or equal to the length of the second straight section 132a, which can increase the contact area between the second straight section 132a and the coolant, further enhancing the heat absorption effect on the condensation portion 132.

[0091] In a possible embodiment, the recessed portion 112 is located in the middle between two adjacent second straight sections 132 a , and the ratio of the width of the recessed portion 112 to the distance between the two adjacent second straight sections 132 a is 10% to 50%.

[0092] Taking the spacing between two adjacent second straight sections 132a as 7 cm as an example, the width of the recessed portion 112 is 0.7 cm to 3.5 cm, and the spacing between the recessed portion 112 and the second straight section 132a can be 3.15 cm to 1.75 cm. As the ratio between the width of the recessed portion 112 and the spacing between two adjacent second straight sections 132a increases, the spacing between the sidewall of the recessed portion 112 and the second straight section 132a gradually decreases, and the heat in the second straight section 132a can be dissipated through the recessed portion 112. The side wall of the recessed portion 112 conducts heat to the coolant. The smaller the distance between the side wall of the recessed portion 112 and the second straight section 132a, the higher the heat conduction efficiency between the second straight section 132a and the coolant in the recessed portion 112, which can improve the heat exchange effect between the second straight section 132a and the coolant. However, the processing difficulty of the heat sink 1 is greater, which will reduce the production efficiency of the heat sink 1. At the same time, the larger width of the recessed portion 112 will lead to an increase in the content of coolant in the first main body 11, thereby increasing the use cost of the heat sink 1.

[0093] The ratio of the width of the recessed portion 112 to the distance between two adjacent second straight sections 132a is greater than 10%, which reduces the distance between the sidewall of the recessed portion 112 and the second straight sections 132a, thereby improving the heat exchange efficiency between the second straight sections 132a and the coolant. The ratio of the width of the recessed portion 112 to the distance between two adjacent second straight sections 132a is less than 50%, which provides a certain distance between the sidewall of the recessed portion 112 and the second straight sections 132a. This reduces the difficulty of manufacturing the heat sink 1, thereby improving the production efficiency of the heat sink 1, and also reduces the coolant content in the first main body 11, thereby reducing the cost of using the heat sink 1. Therefore, the ratio of the width of the recessed portion 112 to the distance between two adjacent second straight sections 132a can be 10%, 30%, 50%, etc.

[0094] like Figure 3 and Figure 11 As shown, in one possible embodiment, the condenser portion 132 and the evaporator portion 131 are formed by bending a heat exchange tube 13. The two ports 133 of the heat exchange tube 13 are both located in the condenser portion 132 and protrude from the first main body portion 11. A sealing device is provided at the port 133 of the heat exchange tube 13. When the pressure in the heat exchange tube 13 exceeds a preset range, the sealing device fails.

[0095] Heat exchange tubes 13 contain a heat exchange medium. When the heat exchange medium undergoes a phase change, the pressure within heat exchange tubes 13 changes. When the pressure within heat exchange tubes 13 exceeds a preset range, the sealing device fails. The sealing device can be a structure such as a pressure relief valve that can reduce the pressure within heat exchange tubes 13. When the seal fails, the heat exchange medium within heat exchange tubes 13 can be discharged to reduce the pressure within heat exchange tubes 13. This can further reduce the possibility of heat exchange tubes 13 rupturing due to excessive internal pressure, thereby improving the safety of heat sink 1.

[0096] In one possible embodiment, the battery device includes a management system capable of collecting information such as the temperature of the battery cells 2 and the energy storage performance of the battery cells 2. The sealing device includes a sensor capable of detecting the pressure within the heat exchange tube 13 and is electrically connected to the management system. When the pressure within the heat exchange tube 13 exceeds a preset range, the sensor can send an alarm to the management system.

[0097] The sensor can detect the pressure within the heat exchange tube 13. When the pressure within the heat exchange tube 13 exceeds a preset range, the sealing device fails, causing the heat exchange medium within the heat exchange tube 13 to be discharged, resulting in a reduction in the heat dissipation effect of the heat sink 1. At this time, the sensor sends an alarm to the management system, allowing management personnel to promptly carry out maintenance, reducing the possibility of thermal runaway caused by excessive battery cell 2 temperature, which is beneficial to improving the safety of the battery device. If the sealing device fails and the pressure within the heat exchange tube 13 exceeds the preset pressure, the sealing device has not failed, and the heat exchange medium within the heat exchange tube 13 cannot be discharged. The pressure within the heat exchange tube 13 continues to increase. At this time, the sensor sends an alarm to the management system, allowing management personnel to promptly carry out maintenance, reducing the possibility of rupture of the heat exchange tube 13 due to excessive internal pressure, and thus improving the safety of the heat sink 1.

[0098] The present application also provides an energy storage system comprising multiple battery devices placed within an energy storage cabinet, enabling the energy storage system to store electrical energy through the battery devices. The battery devices in the energy storage system are any of the battery devices described above, and thus possess the technical effects of the aforementioned battery devices, which will not be further described herein.

[0099] The present application also provides an electrical device including a chargeable and dischargeable battery device for providing electrical energy to the electrical device. The battery device is any of the above-described battery devices, and thus has the technical effects of the above-described battery devices, which will not be described in detail here.

Claims

1. A battery device, characterized in that: The battery device comprises: A heat sink (1), the heat sink (1) comprising a first main body (11) and a plurality of second main bodies (12), the first main body (11) comprising a cavity (111), the plurality of second main bodies (12) being arranged at intervals along a length direction of the battery device, and one end of the second main body (12) being located within the cavity (111) to form a flow channel within the cavity (111), and the other end of the second main body (12) protruding from the first main body (11); A plurality of battery cells (2), wherein the plurality of battery cells (2) are located on the surface of the first main body portion (11), and the second main body portion (12) is located between adjacent battery cells (2); The bottom wall of the cavity (111) has a plurality of recessed portions (112), the recessed portions (112) being located between the adjacent second main body portions (12), and the depth of the recessed portions (112) gradually decreases from the middle position of the recessed portions (112) toward the end along the width direction of the battery device.

2. The battery device according to claim 1, wherein: The heat dissipation element (1) comprises a heat exchange tube (13), wherein the heat exchange tube (13) comprises an evaporation portion (131) and a condensation portion (132) that are interconnected, wherein the evaporation portion (131) is embedded in the second main body portion (12), and the condensation portion (132) is embedded in the first main body portion (11).

3. The battery device according to claim 2, characterized in that The evaporation portion (131) comprises a plurality of first straight sections (131a) and a plurality of first bent sections (131b), wherein the plurality of first straight sections (131a) extend along the height direction of the battery device and are arranged at intervals along the width direction of the battery device, and the first bent sections (131b) are located between adjacent first straight sections (131a) to connect adjacent first straight sections (131a).

4. The battery device according to claim 3, characterized in that The condensation portion (132) includes a plurality of second straight sections (132a) and a plurality of second bent sections (132b), wherein the plurality of second straight sections (132a) are arranged at intervals along the length direction of the battery device, and the second bent sections (132b) are located between adjacent second straight sections (132a) to connect adjacent second straight sections (132a); the second straight sections (132a) are connected to the first straight sections (131a).

5. The battery device according to claim 4, characterized in that The condensation portion (132) is located on a side of the cavity (111) away from the second main body portion (12); and the recessed portion (112) is located between adjacent second straight sections (132a).

6. The battery device according to claim 5, characterized in that The ratio between the width of the recessed portion (112) and the spacing between adjacent second straight sections (132a) is 10% to 50%.

7. The battery device according to claim 2, wherein: The port (133) of the heat exchange tube (13) is located in the condensation portion (132) and protrudes from the first main body portion (11). The port (133) has a sealing device. When the pressure in the heat exchange tube (13) is greater than a preset range, the sealing device fails.

8. The battery device according to claim 7, characterized in that The sealing device comprises a sensor for detecting the pressure in the heat exchange tube (13), and when the pressure in the heat exchange tube (13) is greater than a preset range, an alarm is sent to the management system of the battery device.

9. The battery device according to any one of claims 1 to 8, characterized in that Along the height direction of the battery device, the size of the second main body (12) is greater than or equal to the size of the battery core (2).

10. The battery device according to any one of claims 1 to 8, characterized in that An insulating member is provided between the second main body (12) and the battery core (2), and thermal conductive adhesive is provided on both sides of the insulating member.

11. An energy storage system, characterized in that: The energy storage system includes a plurality of battery devices, and the battery devices are the battery devices according to any one of claims 1 to 10.

12. An electrical device, characterized in that: The electrical equipment includes a battery device to supply power to the electrical equipment, and the battery device is the battery device according to any one of claims 1 to 10.

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