Battery device and electric device

Abstract

The utility model discloses a battery device and a power utilization device, the battery device comprises battery monomers and a heat exchange piece, at least two battery monomers are stacked along the height direction of the battery monomers, and each battery monomer comprises a shell and an electrode assembly arranged in the shell; the heat exchange pieces are arranged at the bottoms of the battery monomers in the height direction, the heat exchange pieces are fixed to shells of the battery monomers, and heat exchange flow channels allowing heat exchange media to circulate are formed in the heat exchange pieces. The energy density of the battery device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery device and a power utilization device. BACKGROUND

[0002] In recent years, with the rapid development of new energy technology, new energy vehicles are increasingly widely used and gradually replace traditional fuel vehicles to become one of the mainstream transportation tools. As the power source of new energy vehicles, power batteries are one of the core equipment of new energy vehicles. Therefore, the safety performance of power batteries has become the focus of attention.

[0003] In the development of battery technology, how to improve the energy density of the battery device is a research direction in the battery technology. CONTENT OF THE INVENTION

[0004] The embodiments of the present application provide a battery device and a power utilization device, which can improve the energy density of the battery device.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which comprises battery monomers and a heat exchange element. At least two battery monomers are arranged in a stacking manner along the height direction of the battery monomers. The battery monomer comprises an outer shell and an electrode assembly arranged in the outer shell. The heat exchange element is arranged at the bottom of each battery monomer along the height direction, and the heat exchange element is fixed with the outer shell of the battery monomer. The inside of the heat exchange element is provided with a heat exchange flow channel for the flow of a heat exchange medium.

[0006] In the above scheme, the heat exchange element is arranged at the bottom of the battery monomer along the height direction and is fixed with the outer shell of the battery monomer. The strength between the battery monomers arranged in the stacking manner along the height direction can be ensured to a certain extent, and the battery monomers can be heat exchanged. The space utilization of the battery device is increased, and thus the energy density of the battery device is improved.

[0007] In some embodiments, the heat exchange elements located between two adjacent battery monomers are in contact with the outer shells of the two adjacent battery monomers, respectively.

[0008] In the above scheme, by contacting the heat exchange element with the outer shells of the two adjacent battery monomers, the heat exchange efficiency can be improved.

[0009] In some embodiments, the heat exchange element comprises a first side and a second side arranged oppositely along the height direction. The first side is closer to the bottom of the battery monomer than the second side. The first side of the heat exchange element is provided with a first adhesive part.

[0010] In the above scheme, the first adhesive part can be used to bond with the bottom of the battery monomer, so as to simplify the structure and facilitate installation.

[0011] In some embodiments, the second side of the heat exchange element is provided with a second adhesive part.

[0012] In the above scheme, the second bonding portion of the heat exchange member located between two adjacent battery cells arranged in the height direction can be bonded to the top of the battery cell, and the heat exchange member located at the bottom can be bonded to the box of the battery device or other components, thereby improving the stability of the battery cell.

[0013] In some embodiments, the heat exchange member includes a heat exchange body and a waterproof portion arranged at the bottom of the heat exchange body.

[0014] In the above scheme, the leakage of the heat exchange medium in the heat exchange member to the next layer of battery cell can be prevented to some extent, and the risk of short circuit is reduced.

[0015] In some embodiments, the heat exchange member further includes a third bonding portion arranged on the side of the waterproof portion away from the heat exchange body.

[0016] In the above scheme, the third bonding portion can be used to bond the battery cell to the box of the battery device, thereby improving the stability of the battery cell.

[0017] In some embodiments, a plurality of battery cells are arranged in a stacked manner along the thickness direction of the battery cell, the heat exchange member extends along the thickness direction of the battery cell, and the plurality of battery cells arranged in a stacked manner along the thickness direction share one heat exchange member.

[0018] In the above scheme, by sharing one heat exchange member for the battery cells in the same layer, the structure can be simplified, the space utilization of the battery device is further increased, and the energy density of the battery device is further improved.

[0019] In some embodiments, the shell is recessed to form a recess in the height direction and in the direction pointing to the electrode assembly, the battery cell further includes an electrode terminal located in the recess, and the electrode assembly is electrically connected to the electrode terminal.

[0020] In the above scheme, by arranging the electrode terminal in the recess recessed in the direction of the electrode assembly, the space for the electrode terminal between the battery cells stacked in the height direction can be saved, thereby further increasing the space utilization of the battery device, further improving the energy density of the battery device, and also facilitating the direct contact between the heat exchange member and the shell of the battery cell.

[0021] In some embodiments, the battery cell further includes a pressure relief mechanism arranged on one side of the battery cell along the width direction of the battery cell.

[0022] In the above scheme, by arranging the pressure relief mechanism on one side of the battery cell along the width direction of the battery cell, the high-pressure gas from the thermal runaway can be prevented from impacting the battery cell in the upper layer to some extent, thereby improving the reliability of the battery device.

[0023] In a second aspect, the embodiments of the present application further provide a power utilization device, comprising the battery device of any of the above embodiments, and the battery device is configured to provide electric energy.

[0024] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following will specifically describe the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 Structure diagram of a vehicle of some embodiments of the present application;

[0027] Figure 2 Exploded view of a battery device of some embodiments of the present application;

[0028] Figure 3 Structure diagram of a battery module of some embodiments of the present application;

[0029] Figure 4 Exploded structure diagram of a battery cell of some embodiments of the present application;

[0030] Figure 5 Partial structure diagram of a battery device of some embodiments of the present application;

[0031] Figure 6 Exploded diagram of Figure 5 ;

[0032] Figure 7 Structure diagram of a heat exchange member of some embodiments of the present application;

[0033] Figure 8 Structure diagram of a battery device of some embodiments of the present application;

[0034] Figure 9 Structure diagram of a battery cell of some embodiments of the present application.

[0035] Explanation of reference signs:

[0036] 1000, vehicle; 100, battery device; 200, controller; 300, motor; 10, upper cover; 30, case; 400, battery module; 20, battery cell; 21, end cover; 22, housing; 23, electrode assembly; 24, outer case; 25, recess; 26, electrode terminal; 27, pressure relief mechanism; 40, heat exchange member; 41, first side; 42, second side; 43, first adhesive portion; 44, second adhesive portion; 45, heat exchange body; 46, waterproof portion; 47, third adhesive portion; X, height direction; Y, thickness direction; Z, width direction. DETAILED DESCRIPTION

[0037] The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description and drawings of the following examples are intended to illustrate the principles of the present application by way of example only and should not be taken in a limiting sense. The scope of the present application is defined by the appended claims.

[0038] In the description of the present application, it is necessary to point out that, unless otherwise specified, the meaning of "a plurality of" is more than two; the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like merely indicates or suggests the orientation or positional relationship in the drawings and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0039] In the present application, the phrase "embodiment" means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase at various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in the present application can be combined with other embodiments.

[0040] The orientation words appearing in the following description are the directions shown in the drawings and are not intended to limit the specific structure of the present application. In the description of the present application, it is also necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0041] In the present application, the battery cell can include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium lithium-ion battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, etc. The present application embodiments are not limited thereto. The battery cell can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The present application embodiments are not limited thereto. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, etc. The present application embodiments are not limited thereto.

[0042] The battery device mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0043] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0044] In some embodiments, the battery device can be a battery pack including a box and one or more battery cell assemblies accommodated in the box.

[0045] As an example, the battery cell assembly can be a battery module, and the battery cell assembly can be accommodated in the box by fixing the battery module in the box.

[0046] As an example, the battery cell assembly can also be accommodated in the box by directly fixing a plurality of battery cells in the box.

[0047] The present application embodiments provide a power consumption device using a battery as a power source. The power consumption device can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. Among them, the electric toy can include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric plane toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0048] At present, due to the increase in the height of the box of the battery device, the battery cells need to be designed in multiple layers inside the box. In order to meet the strength, profiled plates need to be added between the battery cells of different layers to strengthen the vertical strength between the battery cells, and heat exchange components are also needed to exchange heat for the battery cells, which leads to a low space utilization rate inside the battery device and reduces the energy density.

[0049] To solve the above technical problems, an embodiment of the present application provides a battery device, which comprises battery monomers and a heat exchange element. At least two battery monomers are arranged in a stacking manner along the height direction of the battery monomers. The battery monomer comprises an outer shell and an electrode assembly arranged in the outer shell. The heat exchange element is arranged at the bottom of each battery monomer along the height direction, and the heat exchange element is fixed with the outer shell of the battery monomer. The heat exchange element is internally provided with a heat exchange flow channel for the flow of a heat exchange medium.

[0050] In the above scheme, the heat exchange element is arranged at the bottom of the battery monomer along the height direction and is fixed with the outer shell of the battery monomer. The strength between the battery monomers arranged in a stacking manner along the height direction can be ensured to a certain extent, and the battery monomers can be heat exchanged, the space utilization of the battery device is increased, and the energy density of the battery device is improved.

[0051] The following embodiments are described for the convenience of illustration, taking a vehicle 1000 as an example for a kind of use electric device of an embodiment of the present application.

[0052] Please refer to Figure 1 , Figure 1 The structure schematic diagram of vehicle provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid vehicle or a range extended vehicle. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom or head or tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as the operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0053] In some embodiments of the present application, the battery device 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0054] Please refer to Figure 2 , Figure 2An exploded view of the device provided for some embodiments of the present application. The battery device 100 includes a battery box and a battery cell 20. In some embodiments, the battery box can include an upper cover 10 and a box 30, the upper cover 10 and the box 30 are mutually covered, and the upper cover 10 and the box 30 jointly define a containing cavity for containing the battery cell 20. The box 30 can be a hollow structure with one end open, and the upper cover 10 can be a plate-like structure, which covers the open side of the box 30 so that the upper cover 10 and the box 30 jointly define the containing cavity; the upper cover 10 and the box 30 can also be hollow structures with one side open, and the open side of the upper cover 10 covers the open side of the box 30. Of course, the battery box formed by the upper cover 10 and the box 30 can have various shapes, such as a cylinder, a cuboid, etc.

[0055] Figure 3 A structural schematic diagram of the battery module for some embodiments of the present application. In the battery device 100, the battery cell 20 can be multiple, and the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 20 is contained in the box; of course, the battery device 100 can also be in the form that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module 400, and then the multiple battery modules 400 are connected in series, in parallel, or in a mixed connection to form a whole, which is contained in the box. The battery device 100 can also include other structures, for example, the battery device 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 20.

[0056] Each battery cell 20 can be a secondary battery cell or a primary battery cell; it can also be a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0057] Please refer to Figure 4 , Figure 4 A disassembled structural schematic diagram of the battery cell provided for some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes a battery. The battery cell 20 includes an end cover 21, a shell 22, an electrode assembly 23, and other functional components.

[0058] The end cover 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cover 21 can be adapted to the shape of the shell 22 to fit the shell 22. Optionally, the end cover 21 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 21 is less likely to deform when subjected to extrusion collision, allowing the battery cell 20 to have higher structural strength and improved safety performance. The end cover 21 can be provided with functional components such as the electrode terminal 26. The electrode terminal 26 can be used to electrically connect with the electrode assembly 23 for outputting or inputting the electrical energy of the battery cell 20. In some embodiments, the end cover 21 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 20 when the internal pressure or temperature reaches a threshold value. The material of the end cover 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon. In some embodiments, an insulating member can also be provided on the inner side of the end cover 21, which can be used to isolate the electrical connection components in the shell 22 from the end cover 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0059] Figure 5 is a partial structural schematic diagram of a battery device according to some embodiments of the present application; Figure 6 is an exploded schematic diagram of Figure 5 .

[0060] Please refer to Figure 5 and Figure 6 , in a first aspect, the embodiments of the present application provide a battery device 100, which comprises a battery cell 20 and a heat exchange member 40, at least two battery cells 20 are stacked along the height direction X of the battery cell 20, the battery cell 20 comprises a shell 24 and an electrode assembly 23 arranged in the shell 24; the heat exchange member 40 is arranged at the bottom of each battery cell 20 along the height direction X, and the heat exchange member 40 is fixed with the shell 24 of the battery cell 20, and the inside of the heat exchange member 40 is provided with a heat exchange flow channel for the flow of heat exchange medium.

[0061] According to the space of the box 30 of the battery device 100, along the height direction X of the battery cell 20, two layers of battery cells 20 can be arranged, or three or more layers of battery cells 20 can be arranged. The bottom of the battery cell 20 located in the bottom layer is also provided with a heat exchange member 40. Each layer can be provided with multiple battery cells 20 stacked along the thickness direction Y of the battery cell 20. The bottoms of the multiple battery cells 20 of each layer can share one heat exchange member 40, or a heat exchange member 40 can be arranged at the bottom of each battery cell 20.

[0062] The shell 24 can include an end cover 21 and a shell body 22, and the end cover 21 is arranged on the shell body 22. The heat exchange member 40 between the battery cells 20 in different layers can be fixed with the shell body 22 of the battery cell 20 in the upper layer and the end cover 21 of the battery cell 20 in the lower layer respectively. The heat exchange member 40 can be connected with the shell 24 of the battery cell 20 by bonding, clamping or bolts.

[0063] The heat exchange member 40 can be made of aluminum or other materials by extrusion process, or can be made of other materials, or can be assembled by different components. The heat exchange member 40 has at least one heat exchange channel inside. The heat exchange medium can include ethylene glycol, water or silicone oil, etc. The battery cell 20 can be cooled or heated by the heat exchange medium according to the ambient temperature. For example, when the vehicle is running at high speed or the battery device 100 is high-rate charged or discharged, the battery cell 20 will generate a large amount of heat, and the low-temperature heat exchange medium circulating in the heat exchange channel will transfer the heat away, which can avoid the temperature of the battery cell 20 from being too high to a certain extent, thereby prolonging the service life of the battery cell 20. When the ambient temperature is very low, the battery cell 20 can be heated by the heated heat exchange medium to work at an appropriate temperature.

[0064] In the above scheme, the heat exchange member 40 is arranged at the bottom of the battery cell 20 along the height direction X and is fixed with the shell 24 of the battery cell 20, which can not only ensure the strength between the battery cells 20 stacked along the height direction X to a certain extent, but also heat exchange the battery cells 20, thereby increasing the space utilization of the battery device 100 and improving the energy density of the battery device 100.

[0065] In some embodiments, the heat exchange member 40 between two adjacent battery cells 20 is in contact with the shell 24 of the two adjacent battery cells 20 respectively.

[0066] The electrode terminal 26 can be arranged at the side along the width direction Z of the battery cell 20, which will not interfere with the heat exchange member 40. Alternatively, the shell 24 is recessed inward to form a recess 25, and the electrode terminal 26 is arranged in the recess 25, which can also avoid the interference between the electrode terminal 26 and the heat exchange member 40.

[0067] For example, the upper side of the heat exchange member 40 between the battery cells 20 in the first layer and the second layer is in contact with the bottom of the shell 24 of the battery cell 20 in the second layer, and the lower side is in contact with the top of the shell 24 of the battery cell 20 in the first layer, so that the heat exchange member 40 can not only heat exchange the battery cell 20 in the second layer, but also heat exchange the battery cell 20 in the first layer.

[0068] In the above scheme, the heat exchange member 40 is in contact with the shell 24 of the two adjacent battery cells 20, which can improve the heat exchange efficiency.

[0069] Figure 7 This is a schematic diagram of the structure of a heat exchanger according to some embodiments of this application.

[0070] like Figure 7 As shown, in some embodiments, the heat exchanger 40 includes a first side 41 and a second side 42 disposed opposite to each other along the height direction X. The first side 41 is close to the bottom of the battery cell 20 relative to the second side 42, and the first side 41 of the heat exchanger 40 is provided with a first adhesive portion 43.

[0071] Viewed from the height direction X, the first side 41 is the upper side of the heat exchanger 40, and the second side 42 is the lower side of the heat exchanger 40. The first adhesive part 43 can be made of thermally conductive silicone or epoxy resin adhesive. Thermally conductive silicone not only achieves the bonding function but also improves the heat exchange efficiency.

[0072] The first adhesive portion 43 is directly bonded to the bottom of the housing 24 of the battery cell 20. The first adhesive portion 43 can be applied to the entire surface of the first side 41 of the heat exchanger 40, or it can be applied to a portion of the first side 41.

[0073] In the above solution, the first adhesive part 43 can be bonded to the bottom of the battery cell 20, which simplifies the structure and facilitates installation.

[0074] In some embodiments, a second adhesive portion 44 is provided on the second side 42 of the heat exchanger 40.

[0075] The first adhesive portion 43 can be made of thermally conductive silicone or epoxy resin adhesive. The second adhesive portion 44 can be coated on the entire surface of the second side 42 of the heat exchanger 40, or it can be coated on a portion of the second side 42.

[0076] For example, the heat exchanger 40 located at the bottom of the battery cell 20 in the first layer can be bonded to the housing 30 of the battery device 100 via the second adhesive portion 44, or other components can also be bonded via the second adhesive portion 44. The heat exchanger 40 located at the bottom of the battery cell 20 in the second layer can be bonded to the top of the battery cell 20 in the first layer via the second adhesive portion 44.

[0077] In the above scheme, the second bonding portion 44 of the heat exchanger 40 located between two adjacent battery cells 20 arranged along the height direction X can be bonded to the top of the battery cell 20, and the heat exchanger 40 located at the bottom can be bonded to the housing 30 of the battery device 100 or other components, thereby improving the stability of the battery cell 20.

[0078] In some embodiments, the heat exchanger 40 includes a heat exchange body 45 and a waterproof portion 46, the waterproof portion 46 being disposed at the bottom of the heat exchange body 45.

[0079] The waterproof part 46 can be attached to the heat exchange body 45 via the second adhesive part 44.

[0080] The waterproof part 46 can be made of materials such as rubber, polytetrafluoroethylene, or silicone rubber. The shape and size of the waterproof part 46 can be the same as or similar to the shape and size of the heat exchange body 45.

[0081] Without the waterproof part 46, if the heat exchange component 40 is damaged, the heat exchange medium will leak downwards and flow to the electrode terminal 26 of the battery cell 20, which can easily cause a short circuit.

[0082] The above solution can, to a certain extent, prevent the heat exchange medium in the heat exchange component 40 from leaking to the battery cell 20 in the next layer, thereby reducing the risk of short circuit.

[0083] In some embodiments, the heat exchanger 40 further includes a third adhesive portion 47, which is disposed on the side of the waterproof portion 46 away from the heat exchanger body 45.

[0084] In the above solution, the battery cell 20 can be bonded to the housing 30 of the battery device 100 through the third adhesive part 47, thereby improving the stability of the battery cell 20.

[0085] Figure 8 This is a schematic diagram of the structure of a battery device according to some embodiments of this application.

[0086] like Figure 8 As shown, in some embodiments, multiple battery cells 20 are stacked along the thickness direction Y of the battery cells 20, and a heat exchanger 40 extends along the thickness direction Y of the battery cells 20. Multiple battery cells 20 stacked along the thickness direction Y share a single heat exchanger 40.

[0087] In other words, the heat exchanger 40 extends along the thickness direction Y of the battery cell 20, and the bottom of each layer of battery cell 20 is fixed to the same heat exchanger 40.

[0088] In the above scheme, by sharing a heat exchanger 40 among the battery cells 20 located on the same layer, the structure can be simplified, the space utilization of the battery device 100 can be further increased, and the energy density of the battery device 100 can be further improved.

[0089] Figure 9 This is a schematic diagram of the structure of a battery cell according to some embodiments of this application.

[0090] like Figure 9 As shown, in some embodiments, the housing 24 is recessed along the height direction X and in the direction pointing towards the electrode assembly 23 to form a recess 25, and the battery cell 20 also includes an electrode terminal 26 located in the recess 25, and the electrode assembly 23 is electrically connected to the electrode terminal 26.

[0091] The recess 25 can be arranged on the end cover 21 of the shell 24, and the end cover 21 is recessed towards the shell 22. The electrode terminal 26 of the positive electrode and the electrode terminal 26 of the negative electrode are both located at the position of the recess 25.

[0092] In the above scheme, by arranging the electrode terminal 26 in the recess 25 recessed towards the electrode assembly 23, the space of the electrode terminal 26 between the battery monomers 20 stacked in the height direction X can be reserved, thereby further increasing the space utilization of the battery device 100, thereby further improving the energy density of the battery device 100, and also facilitating the direct contact of the heat exchange member 40 with the shell 24 of the battery monomer 20.

[0093] In some embodiments, the battery monomer 20 further comprises a pressure relief mechanism 27 arranged on one side of the battery monomer 20 along the width direction Z thereof.

[0094] The pressure relief mechanism 27 is a crucial safety component in the battery device 100. Its main function is to release pressure in time when the internal pressure of the battery abnormally rises, so as to prevent the battery from exploding or other serious safety accidents. When the battery produces a large amount of gas inside due to overcharging, overdischarging, internal short circuit or external thermal shock, etc., causing the pressure to exceed the safety range, the pressure relief mechanism 27 will open to discharge the excess gas, thereby ensuring the safety of the battery.

[0095] In the above scheme, by arranging the pressure relief mechanism 27 on one side along the width direction Z of the battery monomer 20, the high-pressure gas impact on the upper layer of battery monomers 20 when thermal runaway occurs can be avoided to some extent, thereby improving the reliability of the battery device 100.

[0096] In a second aspect, the embodiments of the present application also provide a power utilization device, which comprises the battery device 100 of any of the above-mentioned embodiments, and the battery device 100 is used to provide electric energy.

[0097] According to some embodiments of the present application, the present application provides a battery device 100, which comprises a battery monomer 20 and a heat exchange member 40. At least two battery monomers 20 are arranged in a stacked manner along the height direction X of the battery monomer 20. The battery monomer 20 comprises a shell 24 and an electrode assembly 23 arranged in the shell 24. The heat exchange member 40 is arranged at the bottom of each battery monomer 20 along the height direction X, and the heat exchange member 40 is fixed with the shell 24 of the battery monomer 20. The inside of the heat exchange member 40 is provided with a heat exchange flow channel for the flow of a heat exchange medium. The shell 24 is recessed in the height direction X and in the direction pointing to the electrode assembly 23 to form a recess 25. The battery monomer 20 further comprises an electrode terminal 26 located at the recess 25. The electrode assembly 23 is electrically connected with the electrode terminal 26.

[0098] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, include: A battery cell, wherein at least two battery cells are stacked along the height direction of the battery cell, and the battery cell includes a housing and an electrode assembly disposed within the housing; A heat exchanger is disposed at the bottom of each battery cell along the height direction, and the heat exchanger is fixed to the outer shell of the battery cell. The heat exchanger is provided with a heat exchange channel for the flow of heat exchange medium inside.

2. The battery device according to claim 1, characterized in that, The heat exchanger located between two adjacent battery cells is in contact with the outer casing of the two adjacent battery cells respectively.

3. The battery device according to claim 2, characterized in that, The heat exchanger includes a first side and a second side disposed opposite to each other along the height direction. The first side is closer to the bottom of the battery cell than the second side. The first side of the heat exchanger is provided with a first adhesive portion.

4. The battery device according to claim 3, characterized in that, A second adhesive portion is provided on the second side of the heat exchanger.

5. The battery device according to claim 1, characterized in that, The heat exchanger includes a heat exchange body and a waterproof part, wherein the waterproof part is disposed at the bottom of the heat exchange body.

6. The battery device according to claim 5, characterized in that, The heat exchanger also includes a third adhesive portion, which is disposed on the side of the waterproof portion away from the heat exchange body.

7. The battery device according to any one of claims 1-6, characterized in that, Multiple battery cells are stacked along the thickness direction of the battery cells, and the heat exchanger extends along the thickness direction of the battery cells. Multiple battery cells stacked along the thickness direction share one heat exchanger.

8. The battery device according to any one of claims 1-6, characterized in that, The outer casing is recessed along the height direction and in the direction of the electrode assembly to form a recess. The battery cell also includes an electrode terminal located in the recess, and the electrode assembly is electrically connected to the electrode terminal.

9. The battery device according to claim 8, characterized in that, The battery cell also includes a pressure relief mechanism, which is disposed on one side of the battery cell along its width direction.

10. An electrical device, characterized in that, Includes the battery device according to any one of claims 1-9, the battery device being used to provide electrical energy.

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