Heat exchange assembly, battery device and power utilization device

Abstract

The embodiment of the utility model provides a heat exchange assembly, a battery device and an electric device. The battery device comprises a box body assembly, a heat exchange assembly and a plurality of single batteries, and the plurality of battery monomers are arranged in the box body assembly. The heat exchange assembly comprises a heat exchange piece and a current collector. At least one medium flow channel is arranged in the heat exchange part and is used for conducting a heat exchange medium, and the heat exchange medium is used for exchanging heat with the plurality of single batteries. The current collector is provided with a current collecting space and a liquid passing opening communicated with the current collecting space, and the current collecting space is communicated with at least part of the medium flow channel. A first connecting part is formed at at least one end of the heat exchange piece in the extending direction, and part of the first connecting part is sunken to form a groove. And at least part of the current collector is integrally injection-molded on the first connecting part. According to the battery device provided by the embodiment of the invention, the current collector and the groove can be embedded with each other, and the connection reliability and the sealing performance between the current collector and the heat exchange piece are improved, so that the reliability of the heat exchange assembly is improved.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a heat exchange component, a battery device, and an electrical device. Background Art

[0002] In a new energy vehicle equipped with a battery device, the battery device can be used to provide power in whole or in part. During the use of the battery device, the battery cells inside the battery device generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, the battery device is cooled by a heat exchange component. Therefore, how to effectively cool the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field. Summary of the Utility Model

[0003] In view of this, embodiments of the present application are expected to provide a heat exchange component, a battery device, and an electrical device, which can improve the reliability of the heat exchange component to a certain extent.

[0004] To this end, a first aspect of embodiments of the present application provides a battery device, including:

[0005] A box body assembly;

[0006] A plurality of battery cells, the plurality of battery cells being disposed inside the box body assembly;

[0007] A heat exchange component, the heat exchange component including a heat exchange member and a current collector. The heat exchange member has at least one medium flow channel inside, and the at least one medium flow channel is used to conduct a heat exchange medium. The heat exchange medium is used to exchange heat with the plurality of battery cells. The current collector is provided with a current collection space and a liquid passing port communicating with the current collection space, and the current collection space communicates with at least part of the medium flow channels;

[0008] Wherein, at least one end of the heat exchange member in the extending direction forms a first connection portion, and a partial area of the first connection portion is recessed to form a groove, and at least part of the current collector is integrally injection molded on the first connection portion.

[0009] The battery device provided by the embodiments of the present application includes a box body assembly, a heat exchange component, and a plurality of battery cells. The plurality of battery cells are disposed inside the box body assembly, and the box body assembly plays a role in protecting the battery cells. The heat exchange component is used to exchange heat with the battery cells. By recessing a partial area of the first connection portion of the heat exchange member to form a groove, and integrally injection molding at least part of the current collector on the first connection portion, in this way, the current collector can be mutually engaged with the groove of the first connection portion, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchange member, thereby improving the reliability of the heat exchange component.

[0010] In some embodiments, the groove includes at least one first sub - groove formed on the outer sidewall of the first connecting portion.

[0011] In this way, the current collector can be engaged with the first sub - groove, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchanger.

[0012] In some embodiments, at least one of the first sub - grooves is annularly arranged on the outer sidewall of the first connecting portion and is connected end to end.

[0013] In this embodiment, by annularly arranging at least one first sub - groove on the outer sidewall of the first connecting portion and connecting it end to end, during the process of at least partially injection - molding the current collector on the outer sidewall of the first connecting portion, a complete sealing rib can be formed by the current collector in the first sub - groove. The setting of this complete sealing rib is beneficial to further improving the sealing performance between the current collector and the heat exchanger and reducing the possibility of medium leakage.

[0014] In some embodiments, the number of the first sub - grooves is multiple, and the multiple first sub - grooves are arranged at intervals along the extending direction of the heat exchanger.

[0015] In this embodiment, by setting multiple first sub - grooves and arranging them at intervals along the extending direction of the heat exchanger, it is beneficial to further improve the sealing performance between the current collector and the heat exchanger.

[0016] In some embodiments, the groove includes at least one second sub - groove formed on the end face of the first connecting portion.

[0017] In this way, the current collector can be engaged with the second sub - groove, which is beneficial to further improving the connection reliability and sealing performance between the current collector and the heat exchanger.

[0018] In some embodiments, at least one of the second sub - grooves is annularly arranged on the end face of the first connecting portion and is connected end to end.

[0019] In this embodiment, by annularly arranging at least one second sub - groove on the end face of the first connecting portion and connecting it end to end, during the process of at least partially injection - molding the current collector on the end face of the first connecting portion, a complete sealing rib can be formed by the current collector in the second sub - groove. The setting of this complete sealing rib is beneficial to further improving the sealing performance between the current collector and the heat exchanger and reducing the possibility of medium leakage.

[0020] In some embodiments, the groove includes at least one third sub - groove formed on the inner wall of a part of the medium flow channel.

[0021] In this way, the current collector can be mutually engaged with the third sub-tank, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchanger.

[0022] In some embodiments, the current collector includes a current collecting body and an adapter. At least a part of the adapter is integrally injection molded on the first connecting portion. The current collecting body is connected to the heat exchanger through the adapter, and a current collecting space and a liquid passing port are formed inside the current collecting body.

[0023] The provision of the adapter facilitates the connection between the heat exchanger and the current collector, thereby improving the assembly efficiency and connection reliability.

[0024] In some embodiments, a groove is formed on the outer sidewall of the first connecting portion. The adapter includes an adapter ring, and the adapter ring is integrally injection molded on the outer sidewall of the first connecting portion.

[0025] That is to say, a sealing rib can be formed by the adapter ring in the groove on the outer sidewall of the first connecting portion, so that the adapter ring and the groove are mutually engaged. To a certain extent, it can reduce the possibility of the heat exchange medium flowing out from the gap between the adapter ring and the outer sidewall of the first connecting portion, which is beneficial to improving the connection reliability and sealing performance between the adapter ring and the heat exchanger.

[0026] In some embodiments, the adapter includes a first plugging member, and the first plugging member is integrally injection molded on the end face of the first connecting portion for plugging part of the medium flow channel.

[0027] Here, according to the application scenario, by using the first plugging member to plug part of the medium flow channel, it can enable the heat exchange assembly to meet the heat exchange efficiency while improving the flow efficiency of the heat exchange medium. In addition, it is also beneficial to reduce the weight of the heat exchanger.

[0028] In some embodiments, a groove is formed on the end face of the first connecting portion.

[0029] A sealing rib can be formed by the first plugging member in the groove on the end face of the first connecting portion, so that the first plugging member and the groove are mutually engaged, which can further reduce the possibility of the heat exchange medium flowing out from the gap between the first plugging member and the end face of the first connecting portion, and is beneficial to further improving the connection reliability and sealing performance between the first plugging member and the heat exchanger.

[0030] In some embodiments, the first plugging member includes a plugging portion for plugging the medium flow channel. The adapter further includes a second plugging member disposed in the medium flow channel corresponding to the plugging portion for jointly plugging the medium flow channel with the plugging portion.

[0031] In this embodiment, by providing the second plugging member, during the process of integrally injection-molding the adapter ring on the outer sidewall of the first connecting portion, the second plugging member can support the medium flow channel of the heat exchange member, and at the same time, can also preliminarily plug the medium flow channel. In addition, during the process of integrally injection-molding the first plugging member on the outer sidewall of the first connecting portion, the second plugging member can also play a supporting role and a plugging role.

[0032] In some embodiments, a groove is formed on the inner wall of the medium flow channel provided with the second plugging member.

[0033] It can make part of the slurry enter the groove between the second plugging member and the inner wall of the medium flow channel, which can improve the connection reliability between the second plugging member and the first plugging member, and at the same time, is also beneficial to further improve the connection reliability and sealing performance between the adapter and the heat exchange member.

[0034] In some embodiments, the first plugging member is integrally injection-molded on the surface of the second plugging member.

[0035] It improves the integrity of the adapter, which is beneficial to further improve the connection reliability and sealing performance between the adapter and the heat exchange member.

[0036] In some embodiments, a clamping groove is formed on one side of the second plugging member facing the first plugging member, and the plugging portion is clamped in the clamping groove.

[0037] It is beneficial to improve the bonding force between the first plugging member and the second plugging member.

[0038] In some embodiments, the second plugging member includes a connected strengthening portion and a second connecting portion. The strengthening portion is connected to the first plugging member through the second connecting portion. The strengthening portion is provided as a metal part, and the second connecting portion is provided as an injection-molded part.

[0039] In this embodiment, by providing the second plugging member to include a connected strengthening portion and a second connecting portion, setting the strengthening portion as a metal part, and setting the second connecting portion as an injection-molded part, while improving the structural strength of the second plugging member to improve the plugging reliability of the second plugging member, it is also beneficial to improve the connection strength between the second plugging member and the first plugging member.

[0040] In some embodiments, the manifold body is thermally pressed or adhesively connected to the adapter.

[0041] This connection method is simple and reliable.

[0042] In some embodiments, the manifold body is provided as an injection-molded part.

[0043] And the manifold body of the embodiment of the present application is provided as an injection-molded part, which is beneficial to improve the manufacturing efficiency and at the same time is beneficial to reduce the cost.

[0044] In some embodiments, the current collector includes a first current collector and a second current collector. The first current collector is provided with a first current collection space, a first liquid passing port and a second liquid passing port that communicate with the first current collection space. The second current collector is provided with a second current collection space, a third liquid passing port and a fourth liquid passing port that communicate with the second current collection space. The first current collector and the second current collector are respectively disposed at two ends of the heat exchange member along the extending direction. The first current collection space and the second current collection space communicate with the medium flow channel.

[0045] The first current collector and the second current collector are respectively disposed at the first end and the second end in the length direction of the heat exchange member.

[0046] In a second aspect of the embodiments of the present application, a heat exchange assembly is provided. The heat exchange assembly includes a heat exchange member and a current collector. The heat exchange member has at least one medium flow channel inside. The at least one medium flow channel is used to conduct a heat exchange medium. The heat exchange medium is used to exchange heat with a battery cell. The current collector is provided with a current collection space and a liquid passing port that communicates with the current collection space. The current collection space communicates with at least a part of the medium flow channel;

[0047] Wherein, at least one end of the heat exchange member along the extending direction forms a first connection portion. A partial area of the first connection portion is recessed to form a groove. At least a part of the current collector is integrally injection molded on the first connection portion.

[0048] The heat exchange assembly provided by the embodiments of the present application is used to exchange heat with a battery cell. By recessing a partial area of the first connection portion of the heat exchange member to form a groove and integrally injection molding at least a part of the current collector on the first connection portion, in this way, the current collector can be mutually engaged with the groove of the first connection portion, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchange member, thereby improving the reliability of the heat exchange assembly.

[0049] In a third aspect of the embodiments of the present application, an electrical device is provided, including the battery device or the heat exchange assembly described above.

[0050] The battery device of the electrical device provided by the embodiments of the present application includes a box body assembly, a heat exchange assembly and a plurality of battery cells. The plurality of battery cells are disposed in the box body assembly. The box body assembly plays a role in protecting the battery cells. The heat exchange assembly is used to exchange heat with the battery cells. By recessing a partial area of the first connection portion of the heat exchange member to form a groove and integrally injection molding at least a part of the current collector on the first connection portion, in this way, the current collector can be mutually engaged with the groove of the first connection portion, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchange member, thereby improving the reliability of the heat exchange assembly. Brief Description of the Drawings

[0051] Figure 1 Schematic structural diagram of a vehicle provided by some embodiments of the present disclosure;

[0052] Figure 2 Exploded perspective view of a battery device provided by some embodiments of the present disclosure;

[0053] Figure 3 Assembly schematic diagram of a heat exchange component and a battery cell provided by some embodiments of the present disclosure;

[0054] Figure 4 Partial structural schematic diagram of a heat exchange component provided by some embodiments of the present disclosure;

[0055] Figure 5 Exploded perspective view of a heat exchange component provided by some embodiments of the present disclosure;

[0056] Figure 6 Partial cross-sectional view of a heat exchange component provided by some embodiments of the present disclosure;

[0057] Figure 7 For Figure 6 exploded perspective view;

[0058] Figure 8 Schematic structural diagram of a heat exchange part provided by some embodiments of the present disclosure;

[0059] Figure 9 For Figure 8 enlarged view at A in;

[0060] Figure 10 Schematic structural diagram of a first plugging member provided by some embodiments of the present disclosure.

[0061] Description of Reference Numerals

[0062] 10. Battery cell; 20. Box body assembly; 21. First box body part; 22. Second box body part; 23. Accommodating cavity; 30. Heat exchange component; 31. Heat exchange part; 311. Heat exchange body; 312. First connection part; 313. Medium flow channel; 314. Groove; 3141. First sub-groove; 3142. Second sub-groove; 32. Current collector; 321. Current collection body; 322. Adapter; 3221. Adapter ring; 3222. First plugging member; 3223. Plugging part; 3224. Communication hole; 3225. Second plugging member; 3226. Card slot; 323. Current collection space; 324. Liquid passing port; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Description of the Embodiments

[0063] Unless otherwise specified, all embodiments and optional embodiments of the present disclosure can be combined with each other to form a new technical solution.

[0064] Unless otherwise specified, all technical features and optional technical features of the present disclosure can be combined with each other to form a new technical solution.

[0065] With the development of clean energy, more and more devices use electric energy as the driving energy. As a result, power batteries that can store more electric energy and can be repeatedly charged and discharged have developed rapidly, such as lithium-ion batteries. Among them, power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric vehicles, as well as in multiple fields such as aerospace.

[0066] In the embodiments of the present disclosure, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue to be used.

[0067] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present disclosure do not limit this.

[0068] The battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, and the separator is disposed between the negative electrode and the positive electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is disposed between the positive electrode and the negative electrode, which can prevent the positive and negative electrodes from short-circuiting and allow active ions to pass through at the same time.

[0069] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0070] In some embodiments, the electrode assembly is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0071] In some embodiments, the electrode assembly is a stacked structure.

[0072] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be respectively provided, and the multiple positive electrode sheets and the multiple negative electrode sheets are alternately stacked.

[0073] As an example, multiple positive electrode sheets can be provided, and the negative electrode sheet is folded to form multiple stacked folding segments, and a positive electrode sheet is clamped between adjacent folding segments.

[0074] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form multiple stacked folding segments.

[0075] As an example, a plurality of separator members may be provided and respectively disposed between any adjacent positive electrode plates or negative electrode plates.

[0076] As an example, the separator members may be continuously provided and disposed between any adjacent positive electrode plates or negative electrode plates by folding or winding.

[0077] In some embodiments, the shape of the electrode assembly may be cylindrical, flat, prismatic, or the like.

[0078] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0079] In some embodiments, the battery cell may include a housing. The housing may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell), or an aluminum-plastic film, etc. In some embodiments, the housing may be a sealed structure or a non-sealed structure. As an example, when the housing is a non-sealed structure, the housing serves to protect the electrode assembly, and a sealing bag is further included between the housing and the electrode assembly, and the sealing bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealing bag may be a bag-shaped insulating member or an aluminum-plastic film. When the housing is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.

[0080] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc., and the present disclosure has no particular limitation.

[0081] In some embodiments, the housing includes an end cap and a housing body. The housing body is provided with an opening, and the end cap covers the opening. The housing body may be provided with one or more openings. One or more end caps may also be provided.

[0082] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab. The electrode terminal may be directly connected to the tab or indirectly connected to the tab through a current collector member. The electrode terminal may be provided on the end cap or on the housing body.

[0083] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0084] During the use of a battery device, the battery cells within the battery device generate heat. If this heat is too high, it will have an adverse impact on the performance and service life of the battery device. Therefore, how to effectively dissipate the heat of the battery cells of the battery device while improving the reliability of the heat exchange component has become an important research direction in this field. In related technologies, it is difficult to control the size and surface flatness of the corrugated pipe, which may result in a poor fit between the corrugated pipe and the current collector, affecting the welding quality, thereby possibly reducing the connection strength and sealing performance between the corrugated pipe and the current collector, and further reducing the reliability of the heat exchange component.

[0085] In view of this, in order to improve the reliability of the heat exchange component, an embodiment of the present disclosure provides a battery device, which includes a box body component, a heat exchange component, and a plurality of battery cells. The plurality of battery cells are arranged within the box body component. The heat exchange component includes a heat exchange element and a current collector. The heat exchange element has at least one medium flow channel inside, and at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells. The current collector is provided with a current collection space and a liquid passing port communicating with the current collection space, and the current collection space communicates with at least part of the medium flow channels. Among them, at least one end of the heat exchange element in the extending direction forms a first connection portion, and a partial area of the first connection portion is recessed to form a groove. At least part of the current collector is integrally injection molded on the first connection portion.

[0086] The battery device provided by the embodiment of the present application includes a box body component, a heat exchange component, and a plurality of battery cells. The plurality of battery cells are arranged within the box body component, and the box body component plays a protective role for the battery cells. The heat exchange component is used to exchange heat with the battery cells. By recessing a partial area of the first connection portion of the heat exchange element to form a groove and integrally injection molding at least part of the current collector on the first connection portion, in this way, the current collector can be mutually engaged with the groove of the first connection portion, which is beneficial to improving the connection reliability and sealing performance between the current collector and the heat exchange element, thereby improving the reliability of the heat exchange component.

[0087] The technical solution described in the embodiment of the present disclosure is applicable to an electrical device using the battery device. The electrical device includes the battery device of any embodiment of the present disclosure, and the battery device is used to provide electrical energy.

[0088] The electrical device can be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The vehicle can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range electric vehicle, etc.; The spacecraft includes an airplane, a rocket, a space shuttle, a spaceship, etc.; The electric toy includes a fixed or mobile electric toy, for example, a game console, an electric vehicle toy, an electric ship toy, an electric airplane toy, etc.; The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact drill, a concrete vibrator, a planer, etc. The embodiments of the present disclosure do not impose special restrictions on the above electrical devices.

[0089] It should be noted that the technical solutions described in the embodiments of the present disclosure are not only applicable to the battery device described above, but also applicable to all electrical devices including the battery device and energy storage devices. However, for the sake of brevity, the following embodiments will be described by taking an electric vehicle as an example.

[0090] Please refer to Figure 1 , inside the vehicle 1000, a controller 200, a motor 300 and a battery device 100 can be arranged. The controller 200 is used to control the battery device 100 to supply power to the motor 300. For example, the battery device 100 can be arranged at the bottom, the front end or the rear end of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000. For example, the battery device 100 can be used as the operating power source of the vehicle 1000 and be used for the circuit system of the vehicle 1000, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1000. In another embodiment of the present disclosure, the battery device 100 can not only be used as the operating power source of the vehicle 1000, but also be used as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0091] Please refer to Figure 2, in order to meet different power usage requirements, the battery device 100 includes a plurality of battery cells 10. A battery cell 10 refers to the smallest unit that makes up a battery module or a battery pack. The plurality of battery cells 10 can be connected in series, in parallel, or in a series-parallel combination. A series-parallel combination means that there are both series and parallel connections among the plurality of battery cells 10. The plurality of battery cells 10 can be directly connected in series, in parallel, or in a series-parallel combination together, and then the whole formed by the plurality of battery cells 10 is accommodated in the box assembly 20; of course, the battery device 100 can also be in the form that a plurality of battery cells 10 are first connected in series, in parallel, or in a series-parallel combination to form battery modules, and then the plurality of battery modules are connected in series, in parallel, or in a series-parallel combination to form a whole and are accommodated in the box assembly 20. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing the electrical connection among the plurality of battery cells 10. Among them, each battery cell 10 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 10 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0092] Please refer to Figures 2 to 10 , an embodiment of the present disclosure provides a battery device 100, which includes a box assembly 20, a heat exchange assembly 30, and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box assembly 20. The heat exchange assembly 30 includes a heat exchange member 31 and a current collector 32. The heat exchange member 31 has at least one medium flow channel 313 inside, and the at least one medium flow channel 313 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the plurality of battery cells 10. The current collector 32 is provided with a current collection space 323 and a liquid passing port 324 communicating with the current collection space 323, and the current collection space 323 communicates with at least part of the medium flow channels 313. At least one end of the heat exchange member 31 in the extending direction forms a first connection portion 312, and a part of the first connection portion 312 is recessed to form a groove 314. At least part of the current collector 32 is integrally injection-molded on the first connection portion 312.

[0093] As used in the embodiments of this application, the term "plurality" refers to a quantity of two or more.

[0094] The box assembly 20 can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, etc., or a complex three-dimensional structure composed of a combination of simple three-dimensional structures such as a cuboid, cylinder, or sphere. The material of the box assembly 20 can be an alloy material such as aluminum alloy or ferroalloy, or a polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber reinforced epoxy resin.

[0095] The box assembly 20 is used to encapsulate the battery cells 10, and the box assembly 20 can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 10.

[0096] Exemplarily, please refer to Figure 2 , the box body assembly 20 is generally a cuboid structure. The length direction X and the width direction Y of the box body assembly 20 are both parallel to the horizontal plane, and the length direction of the box body assembly 20 is parallel to the longest side of the cuboid structure of the box body assembly 20. The height direction Z of the box body assembly 20 is perpendicular to the ground. Exemplarily,

[0097] Please refer to Figures 2 to 10 , the present disclosure embodiment provides a heat exchange assembly 30. The heat exchange assembly 30 includes a heat exchange member 31 and a current collector 32. The heat exchange member 31 has at least one medium flow channel 313 inside. The at least one medium flow channel 313 is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with a plurality of battery cells 10. The current collector 32 is provided with a current collection space 323 and a liquid passing port 324 communicating with the current collection space 323. The current collection space 323 communicates with at least a part of the medium flow channels 313. At least one end of the heat exchange member 31 in the extending direction forms a first connection portion 312, and a part of the first connection portion 312 is recessed to form a groove 314. At least a part of the current collector 32 is integrally injection-molded on the first connection portion 312.

[0098] It should be noted that the specific type of the heat exchange medium is not limited herein as long as it can achieve a heat exchange effect on the battery cells 10. For example, it can be gaseous or liquid. In the present disclosure embodiment, the heat exchange medium is taken as a coolant for description.

[0099] Exemplarily, the liquid passing port 324 includes an inlet and an outlet, and both the inlet and the outlet communicate with the medium flow channel 313.

[0100] Here, the inlet and the outlet of the heat exchange assembly 30 are used to connect to the pipelines of a liquid storage device such as an air conditioning system or a water tank of a vehicle or an electrical equipment.

[0101] It should be noted that the specific number of the medium flow channels 313 is not limited herein. It can be one or multiple.

[0102] The principle of the heat exchange assembly 30 for exchanging heat with the battery cells 10 is as follows: The heat exchange medium output from a heat exchange medium source (not shown in the figure) enters the medium flow channel 313 through the inlet of the heat exchange assembly 30. After the heat exchange medium exchanges heat with the battery cells 10, the heat exchange medium flows out through the outlet of the heat exchange assembly 30, completing the heat exchange of the battery cells 10.

[0103] Here, the heat exchange assembly 30 for exchanging heat with the battery cells 10 can dissipate heat from the battery cells 10 or heat the battery cells 10.

[0104] The box body assembly 20 is used to accommodate the battery cells 10, and the box body assembly 20 can be of various structures. In some embodiments, please refer to Figure 2, the box body assembly 20 includes a first box body part 21 and a second box body part 22, and the first box body part 21 and the second box body part 22 are covered with each other to define a receiving cavity 23 for receiving the battery cells 10.

[0105] Of course, the first box body part 21 and the second box body part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0106] To improve the sealing performance after the connection between the first box body part 21 and the second box body part 22, a sealing member can also be provided between the first box body part 21 and the second box body part 22, such as sealant, sealing ring, etc.

[0107] Assume that the first box body part 21 covers the top of the second box body part 22. The first box body part 21 can also be called the upper box cover, and the second box body part 22 can also be called the lower box cover.

[0108] Exemplarily, the battery device 100 further includes a bottom guard plate, and the bottom guard plate is disposed on the side of the heat exchange assembly 30 away from the battery cells 10.

[0109] Here, by disposing the bottom guard plate on the side of the heat exchange assembly 30 away from the battery cells 10, it can be used to protect the heat exchange assembly 30 and the box body assembly 20, reduce the collision of external debris with the box body assembly 20 during driving, so as to improve the reliability of the battery device 100.

[0110] Of course, the bottom guard plate can also be disposed at the bottom of the box body assembly 20.

[0111] Exemplarily, the heat exchange member 31 can be a corrugated tube.

[0112] A plurality of medium flow channels 313 extending along the length direction (extension direction) of the heat exchange member 31 are formed inside the heat exchange member 31, and the plurality of medium flow channels 313 are arranged along the height direction of the heat exchange member 31 for the heat exchange medium to flow through.

[0113] The specific forming method of the heat exchange member 31 is not limited herein. For example, it can be formed by extrusion molding, die casting molding or injection molding, etc.

[0114] Here, the heat exchange member 31 can form a first connecting portion 312 at one end along the extension direction, or can form first connecting portions 312 at both ends along the extension direction.

[0115] Please refer to Figure 5 , the heat exchange member 31 forms a first connecting portion 312, and the first connecting portion 312 is used to connect with the current collector 32.

[0116] The current collector 32 can be integrally injection molded with the first connecting portion 312 entirely, or can be integrally injection molded with the first connecting portion 312 partially.

[0117] Please refer to Figure 9 , a partial area of the first connecting portion 312 is recessed to form a groove 314. In this way, during the process of integrally injection-molding the current collector 32 on the first connecting portion 312, the injection molding raw material of the current collector 32 can flow into the groove 314, forming a state similar to the roots of a big tree piercing into the ground, that is, the current collector 32 and the groove 314 of the heat exchange member 31 can be mutually engaged, thereby increasing the bonding strength between the current collector 32 and the heat exchange member 31. In addition, the sealing performance between the current collector 32 and the heat exchange member 31 can also be improved.

[0118] Exemplarily, the depth of the groove 314 is in the range of 100 μm to 180 μm.

[0119] The depth of the groove 314 can be a point value of any one of 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm or a point value between any two of them.

[0120] By setting the depth of the groove 314 in the range of 100 μm to 180 μm, while reducing the processing difficulty and ensuring the structural strength of the heat exchange member 31, the bonding strength between the current collector 32 and the heat exchange member 31 can be increased.

[0121] Exemplarily, the heat exchange member 31 is a metal member.

[0122] It should be noted that there are various ways to form the groove 314.

[0123] Exemplarily, the groove 314 on the surface of the heat exchange member 31 can be formed by corroding the surface of the heat exchange member 31 with a chemical corrosion solution, or the groove 314 can be formed on the surface of the heat exchange member 31 by means of laser or the like.

[0124] The battery device 100 provided by the embodiment of the present application includes a box body assembly 20, a heat exchange assembly 30 and a plurality of battery cells 10. The plurality of battery cells 10 are arranged in the box body assembly 20, and the box body assembly 20 plays a role in protecting the battery cells 10. The heat exchange assembly 30 is used for heat exchange with the battery cells 10. By recessing a partial area of the first connecting portion 312 of the heat exchange member 31 to form a groove 314 and integrally injection-molding at least a part of the current collector 32 on the first connecting portion 312, in this way, the current collector 32 and the groove 314 of the first connecting portion 312 can be mutually engaged, which is beneficial to improving the connection reliability and sealing performance between the current collector 32 and the heat exchange member 31, thereby improving the reliability of the heat exchange assembly 30.

[0125] In some embodiments, please refer to Figure 3, the current collector 32 includes a first current collector and a second current collector. The first current collector is provided with a first current collection space 323, a first liquid passing port and a second liquid passing port that communicate with the first current collection space 323. The second current collector is provided with a second current collection space 323, a third liquid passing port and a fourth liquid passing port that communicate with the second current collection space 323. The first current collector and the second current collector are respectively arranged at two ends of the heat exchanger 31 along the extension direction, and the first current collection space 323 and the second current collection space 323 communicate with the medium flow channel 313.

[0126] The first current collector and the second current collector are respectively arranged at the first end and the second end in the length direction of the heat exchanger 31.

[0127] Exemplarily, the first current collector includes a first outer shell. The first outer shell has a first current collection space 323 inside. The side of the first outer shell facing the heat exchanger 31 is open for connecting the first end of the heat exchanger 31.

[0128] Exemplarily, the second current collector includes a second housing. The second housing has a second current collection space 323 inside. The side of the second housing facing the heat exchanger 31 is open for connecting the second end of the heat exchanger 31.

[0129] One end port of the medium flow channel 313 of the heat exchanger 31 communicates with the first current collection space 323, and the other end port of the medium flow channel 313 communicates with the second current collection space 323.

[0130] In some embodiments, the first current collector and the second current collector have the same size and shape, and are symmetrically arranged left and right at both ends in the length direction of the heat exchanger 31.

[0131] Exemplarily, please refer to Figure 3 , in some embodiments, the first liquid passing port and the second liquid passing port are arranged on both sides of the first current collector in the thickness direction of the heat exchanger 31. In this way, it is beneficial to assemble a plurality of heat exchangers 31 in parallel at intervals.

[0132] Of course, in other embodiments, the first liquid passing port and the second liquid passing port can also be arranged at the end of the first current collector far away from the heat exchanger 31. And the first liquid passing port and the second liquid passing port are arranged along the height direction of the first current collector.

[0133] Exemplarily, please refer to Figure 3 , in some embodiments, the third liquid passing port and the fourth liquid passing port are arranged on both sides of the second current collector in the thickness direction of the heat exchanger 31. In this way, it is beneficial to assemble a plurality of heat exchangers 31 in parallel at intervals.

[0134] Of course, in other embodiments, the third liquid passing port and the fourth liquid passing port can also be arranged at the end of the second current collector far away from the heat exchanger 31. And the third liquid passing port and the fourth liquid passing port are arranged along the height direction of the second current collector.

[0135] It should be noted that the specific setting position of the groove 314 is not limited here.

[0136] In some embodiments, please refer to Figures 5 to 9 , the groove 314 includes at least one first sub-groove 3141, and the first sub-groove 3141 is formed on the outer side wall of the first connecting portion 312.

[0137] The number of the first sub-grooves 3141 can be one or more.

[0138] Here, by forming the first sub-groove 3141 on the outer side wall of the first connecting portion 312, at least part of the current collector 32 is injection-molded on the outer side wall of the first connecting portion 312. In this way, the current collector 32 and the first sub-groove 3141 can be mutually engaged, which is beneficial to improving the connection reliability and sealing performance between the current collector 32 and the heat exchanger 31.

[0139] In some embodiments, please refer to Figures 5 to 9 , at least one first sub-groove 3141 is disposed around the outer side wall of the first connecting portion 312 and is connected end to end.

[0140] That is to say, at least one first sub-groove 3141 is an annular groove, that is, the annular groove surrounds the first connecting portion 312 for a whole circle.

[0141] Here, it can be that some of the first sub-grooves 3141 are disposed around the outer side wall of the first connecting portion 312 and are connected end to end, or it can also be that all of the first sub-grooves 3141 are disposed around the outer side wall of the first connecting portion 312 and are connected end to end.

[0142] In this embodiment, by disposing at least one first sub-groove 3141 around the outer side wall of the first connecting portion 312 and connecting it end to end, during the process of injection-molding at least part of the current collector 32 on the outer side wall of the first connecting portion 312, a complete sealing rib can be formed by the current collector 32 in the first sub-groove 3141. The setting of this complete sealing rib is beneficial to further improving the sealing performance between the current collector 32 and the heat exchanger 31 and reducing the possibility of medium leakage.

[0143] In some embodiments, please refer to Figures 5 to 9 , the number of the first sub-grooves 3141 is multiple, and the multiple first sub-grooves 3141 are arranged at intervals along the extending direction of the heat exchanger 31.

[0144] Exemplarily, the first sub-grooves 3141 are disposed in the areas corresponding to the first connecting portion 312.

[0145] In this embodiment, by providing a plurality of first sub-grooves 3141 and arranging the plurality of first sub-grooves 3141 at intervals along the extending direction of the heat exchange member 31, it is beneficial to further improve the sealing performance between the current collector 32 and the heat exchange member 31.

[0146] In some embodiments, referring to Figures 5 to 9 , the groove 314 includes at least one second sub-groove 3142, and the second sub-groove 3142 is formed on the end face of the first connecting portion 312.

[0147] Exemplarily, the heat exchange member 31 includes a heat exchange body 311 and a first connecting portion 312. One end of the first connecting portion 312 is connected to the heat exchange body 311, and the other end extends away from the heat exchange body 311.

[0148] Here, the second sub-groove 3142 is formed on the end face of the first connecting portion 312 away from the heat exchange body 311.

[0149] The number of the second sub-grooves 3142 can be one or more.

[0150] Here, by forming the second sub-groove 3142 on the end face of the first connecting portion 312, at least a part of the current collector 32 is injection-molded on the end face of the first connecting portion 312. In this way, the current collector 32 and the second sub-groove 3142 can be mutually engaged, which is beneficial to further improve the connection reliability and sealing performance between the current collector 32 and the heat exchange member 31.

[0151] In some embodiments, please continue to refer to Figures 5 to 9 , at least one second sub-groove 3142 is disposed around the end face of the first connecting portion 312 and is connected end to end.

[0152] That is to say, at least one second sub-groove 3142 is an annular groove, that is, the annular groove surrounds the first connecting portion 312 for a whole circle.

[0153] Exemplarily, one end of the first connecting portion 312 away from the heat exchange body 311 has an annular end face, and at least one second sub-groove 3142 extends along the extending direction of the annular end face. In the same projection plane perpendicular to the extending direction of the heat exchange member 31, the medium flow channels 313 are all located within the annular end face.

[0154] Here, it can be that some of the second sub-grooves 3142 are disposed around the end face of the first connecting portion 312 and are connected end to end, or all of the second sub-grooves 3142 are disposed around the end face of the first connecting portion 312 and are connected end to end.

[0155] In this embodiment, by arranging at least one second sub-slot 3142 around the end face of the first connecting portion 312 and connecting the head and tail, during the process of at least partially injection-molding the current collector 32 on the end face of the first connecting portion 312, a complete sealing rib can be formed on the current collector 32 within the second sub-slot 3142. The setting of this complete circle of sealing ribs is conducive to further improving the sealing performance between the current collector 32 and the heat exchange member 31 and reducing the possibility of medium leakage.

[0156] In some embodiments, the groove 314 includes at least one third sub-slot formed on the inner wall of a part of the medium flow channel 313.

[0157] The number of the third sub-slots can be one or multiple.

[0158] Here, by forming the third sub-slot on the inner wall of a part of the medium flow channel 313 so that at least part of the current collector 32 is injection-molded on the inner wall of the medium flow channel 313, in this way, the current collector 32 and the third sub-slot can be mutually embedded, which is conducive to improving the connection reliability and sealing performance between the current collector 32 and the heat exchange member 31.

[0159] In some embodiments, please refer to Figures 5 to 7 , the current collector 32 includes a current collecting body 321 and an adapter 322. At least part of the adapter 322 is integrally injection-molded on the first connecting portion 312. The current collecting body 321 is connected to the heat exchange member 31 through the adapter 322, and a current collecting space 323 and a liquid passing port 324 are formed inside the current collecting body 321.

[0160] Exemplarily, both ends of the connecting member in the extending direction of the heat exchange member 31 are respectively connected to the first connecting portion 312 and the current collecting body 321 to realize the connection between the heat exchange member 31 and the current collector 32.

[0161] The setting of the adapter 322 facilitates the connection between the heat exchange member 31 and the current collector 32, thereby improving the assembly efficiency and connection reliability.

[0162] In the related art, the current collecting body is a metal part, and the structure of the current collecting body is relatively complex. The metal current collecting body is generally manufactured by machining processes, resulting in low manufacturing efficiency.

[0163] However, the current collecting body 321 in the embodiment of the present application is set as an injection-molded part, which is beneficial to improving the manufacturing efficiency and reducing the cost at the same time.

[0164] In an embodiment where the heat exchange member 31 is a metal member, by setting the current collector 32 to include a current collecting body 321 and an adapter 322, and integrally injection molding at least a part of the adapter 322 on the first connecting portion 312, and then connecting the current collecting body 321 and the adapter 322, it is beneficial to improve the connection reliability between the current collector 32 of the plastic part and the heat exchange member 31 of the metal part.

[0165] Exemplarily, the current collecting body 321 and the adapter 322 are connected by hot pressing or bonding.

[0166] Exemplarily, the surfaces of the connecting member and the current collecting body 321 close to each other are connected by hot pressing or bonding.

[0167] Here, by connecting the connecting member and the current collecting body 321 by hot pressing or bonding, this connection method is simple and reliable.

[0168] In some embodiments, please refer to Figures 5 to 9 , a groove 314 is formed on the outer sidewall of the first connecting portion 312. The adapter 322 includes an adapter ring 3221, and the adapter ring 3221 is integrally injection molded on the outer sidewall of the first connecting portion 312.

[0169] Exemplarily, the groove 314 formed on the outer sidewall of the first connecting portion 312 is, for example, the first groove 314.

[0170] The adapter ring 3221 is integrally injection molded on the outer sidewall of the first connecting portion 312. That is to say, a sealing rib can be formed by the adapter ring 3221 in the groove 314 on the outer sidewall of the first connecting portion 312, so that the adapter ring 3221 and the groove 314 are mutually engaged, which can reduce the possibility of the heat exchange medium flowing out from the gap between the adapter ring 3221 and the outer sidewall of the first connecting portion 312 to a certain extent, and is beneficial to improving the connection reliability and sealing performance between the adapter ring 3221 and the heat exchange member 31.

[0171] In some embodiments, please refer to Figures 5 to 10 , the adapter 322 includes a first plugging member 3222, and the first plugging member 3222 is integrally injection molded on the end face of the first connecting portion 312 for plugging a part of the medium flow channel 313.

[0172] Exemplarily, the first plugging member 3222 can be a plugging piece.

[0173] Here, according to the application scenario, by plugging a part of the medium flow channel 313 with the first plugging member 3222, the heat exchange assembly 30 can meet the heat exchange efficiency while improving the flow efficiency of the heat exchange medium. In addition, it is beneficial to reduce the weight of the heat exchange member 31.

[0174] Here, the first plugging member 3222 and the adapter ring 3221 may be an integral structure, that is to say, the first plugging member 3222 and the adapter ring 3221 are integrally injection-molded on the first connecting portion 312 at the same time; they may also be a split structure, that is to say, the first plugging member 3222 and the adapter ring 3221 are respectively integrally injection-molded on the first connecting portion 312.

[0175] By integrally injection-molding the first plugging member 3222 on the end face of the first connecting portion 312, to a certain extent, it can reduce the possibility of the heat exchange medium flowing out from the gap between the first plugging member 3222 and the end face of the first connecting portion 312, which is beneficial to improving the connection reliability and sealing performance between the first plugging member 3222 and the heat exchange member 31.

[0176] In some embodiments, please refer to Figures 5 to 10 , a groove 314 is formed on the end face of the first connecting portion 312.

[0177] Exemplarily, the groove 314 formed on the end face of the first connecting portion 312 is, for example, the second groove 314.

[0178] By forming a groove 314 on the end face of the first connecting portion 312, the first plugging member 3222 can form a sealing rib in the groove 314 on the end face of the first connecting portion 312, so that the first plugging member 3222 and the groove 314 are mutually engaged, which can further reduce the possibility of the heat exchange medium flowing out from the gap between the first plugging member 3222 and the end face of the first connecting portion 312, and is beneficial to further improving the connection reliability and sealing performance between the first plugging member 3222 and the heat exchange member 31.

[0179] In some embodiments, please refer to Figures 6 to 10 , the first plugging member 3222 includes a plugging portion 3223, and the plugging portion 3223 is used to plug the medium flow channel 313. The adapter 322 further includes a second plugging member 3225, and the second plugging member 3225 is disposed in the medium flow channel 313 corresponding to the plugging portion 3223 and is used to jointly plug the medium flow channel 313 with the plugging portion 3223.

[0180] Exemplarily, the contour shape of the first plugging member 3222 is the same as the contour shape of the first connecting portion 312.

[0181] A communication hole 3224 and a plugging portion 3223 are provided in the first plugging member 3222. Exemplarily, the communication hole 3224 and the plugging portion 3223 are arranged in sequence.

[0182] The edge of the first plugging member 3222 is hermetically connected to the edge of the first connecting portion 312, and the edge of the plugging portion 3223 is hermetically connected to the edge of the corresponding sealed medium flow channel 313.

[0183] Exemplarily, the second plugging member 3225 can be in a block shape.

[0184] The second plugging member 3225 is disposed in the corresponding medium flow channel 313 of the plugging portion 3223, that is to say, the second plugging member 3225 is disposed in the medium flow channel 313 that needs to be plugged.

[0185] In this embodiment, by providing the second plugging member 3225, during the process of integrally injection molding the adapter ring 3221 on the outer sidewall of the first connecting portion 312, the second plugging member 3225 can support the medium flow channel 313 of the heat exchanger 31, and at the same time, it can also initially plug the medium flow channel 313. In addition, during the process of integrally injection molding the first plugging member 3222 on the outer sidewall of the first connecting portion 312, the second plugging member 3225 can also play a supporting role and a plugging role.

[0186] In some embodiments, please refer to Figures 5 to 10 , a groove 314 is formed on the inner wall of the medium flow channel 313 provided with the second plugging member 3225.

[0187] Exemplarily, the groove 314 formed on the inner wall of the medium flow channel 313 is, for example, the third groove 314.

[0188] By forming the groove 314 on the inner wall of the medium flow channel 313 provided with the second plugging member 3225, when the adapter 322 is integrally injection molded on the first connecting portion 312, part of the slurry can enter the groove 314 between the second plugging member 3225 and the inner wall of the medium flow channel 313, which improves the connection reliability between the second plugging member 3225 and the first plugging member 3222, and at the same time, is beneficial to further improving the connection reliability and sealing performance between the adapter 322 and the heat exchanger 31.

[0189] In some embodiments, please refer to Figures 5 to 7 , the first plugging member 3222 is integrally injection molded on the surface of the second plugging member 3225.

[0190] That is to say, the first plugging member 3222 is integrally injection molded on the surface of the second plugging member 3225 and the first connecting portion 312 at the same time, which improves the integrity of the adapter 322 and is beneficial to further improving the connection reliability and sealing performance between the adapter 322 and the heat exchanger 31.

[0191] In some embodiments, please refer to Figures 5 to 7 , a card slot 3226 is formed on the side of the second plugging member 3225 facing the first plugging member 3222, and the plugging portion 3223 is snap - fitted into the card slot 3226.

[0192] In this embodiment, a clamping groove 3226 is provided on the second sealing member 3225, so that the sealing portion 3223 is clamped in the clamping groove 3226, which is beneficial to improving the bonding force between the first sealing member 3222 and the second sealing member 3225.

[0193] In some embodiments, refer to Figures 5 to 7 , the second sealing member 3225 includes a reinforcing portion and a second connecting portion connected to each other. The reinforcing portion is connected to the first sealing member 3222 through the second connecting portion. The reinforcing portion is provided as a metal part, and the second connecting portion is provided as an injection molded part.

[0194] The setting of the reinforcing portion is beneficial to improving the structural strength of the second sealing member 3225, and can prevent the second sealing member 3225 from being flattened by the injection pressure or slipping due to insufficient friction during injection molding.

[0195] The setting of the second connecting portion and setting the second connecting portion as an injection molded part are beneficial to improving the connection strength between the second sealing member 3225 and the first sealing member 3222.

[0196] In this embodiment, by setting the second sealing member 3225 to include a reinforcing portion and a second connecting portion connected to each other, setting the reinforcing portion as a metal part, and setting the second connecting portion as an injection molded part, while improving the structural strength of the second sealing member 3225 to improve the sealing reliability of the second sealing member 3225, it is also beneficial to improving the connection strength between the second sealing member 3225 and the first sealing member 3222.

[0197] In some embodiments, the difference between the coefficient of thermal expansion of the part of the current collector 32 integrally injection molded on the first connecting portion 312 and the coefficient of thermal expansion of the heat exchange member 31 is less than 50 (1 / °C).

[0198] The part of the current collector 32 integrally injection molded on the first connecting portion 312 includes a transfer ring 3221, a first sealing member 3222, etc.

[0199] It can be understood that an object has the phenomenon of expansion and contraction due to temperature change, and its change ability is represented by the coefficient of thermal expansion, that is, the change in the length value caused by a unit temperature change under constant pressure (p constant).

[0200] If the difference between the coefficient of thermal expansion of the part of the current collector 32 integrally injection molded on the first connecting portion 312 and the coefficient of thermal expansion of the heat exchange member 31 is too large, it may cause the bonding surface of the two to be stressed, resulting in failure during the life cycle.

[0201] In this embodiment, the difference between the coefficient of thermal expansion of the part of the current collector 32 integrally injection-molded on the first connecting portion 312 and the coefficient of thermal expansion of the heat exchange member 31 is less than 50 (1 / °C), which is beneficial to reducing the influence of the force on the joint surface between the current collector 32 and the heat exchange member 31 due to the excessive difference in the coefficient of thermal expansion, and is beneficial to further improving the reliability of the heat exchange assembly 30.

[0202] Exemplarily, the length changes of the current collector 32 and the heat exchange member 31 when the temperature changes can be measured by a laser interferometer (optical interferometry method), so as to calculate the coefficient of thermal expansion. The coefficient of thermal expansion can also be calculated by measuring the resistance change of the heat exchange member 31 when the temperature changes (the resistance method is a measurement method based on the resistance change). Of course, the coefficient of thermal expansion of the current collector 32 and the heat exchange member 31 can also be measured by thermomechanical analysis, differential scanning calorimetry, mechanical dilatometry, capacitance method, etc.

[0203] In the description of the present disclosure, the descriptions with reference to terms such as "in one embodiment", "in some embodiments", "in other embodiments", "in still other embodiments", or "exemplary" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present disclosure. In the present disclosure, the schematic expressions of the above terms are not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine the different embodiments or examples described in the present disclosure and the features of different embodiments or examples.

[0204] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A battery device, characterized in that, include: Box components; A plurality of battery cells, wherein the plurality of battery cells are arranged in the box assembly; A heat exchange assembly, the heat exchange assembly comprising a heat exchange element and a current collector, the heat exchange element having at least one medium flow channel therein, the at least one medium flow channel being used to conduct a heat exchange medium, the heat exchange medium being used to exchange heat with the plurality of battery cells, the current collector being provided with a flow collection space and a liquid port communicating with the flow collection space, the flow collection space being communicated with at least part of the medium flow channel; A first connection portion is formed at at least one end of the heat exchanger along the extension direction, a partial area of ​​the first connection portion is recessed to form a groove, and at least a portion of the current collector is integrally injection molded on the first connection portion.

2. The battery device according to claim 1, wherein The groove includes at least one first sub-groove formed on an outer side wall of the first connecting portion.

3. The battery device according to claim 2, characterized in that, At least one of the first sub-grooves is arranged around the outer side wall of the first connecting portion and is connected end to end.

4. The battery device according to claim 2, characterized in that, There are a plurality of the first sub-grooves, and the plurality of the first sub-grooves are arranged at intervals along the extending direction of the heat exchange element.

5. The battery device according to any one of claims 1 to 4, characterized in that, The groove includes at least one second sub-groove formed on an end surface of the first connecting portion.

6. The battery device according to claim 5, characterized in that, At least one of the second sub-grooves is arranged around the end surface of the first connecting portion and is connected end to end.

7. The battery device according to any one of claims 1 to 4, characterized in that, The groove includes at least one third sub-groove, and the third sub-groove is formed on a portion of the inner wall of the medium flow channel.

8. The battery device according to any one of claims 1 to 4, characterized in that, The current collector includes a current collector body and a transition piece, at least a portion of the transition piece is integrally injection molded on the first connecting portion, the current collector body is connected to the heat exchange element through the transition piece, and the current collecting space and the liquid port are formed inside the current collector body.

9. The battery device according to claim 8, wherein The groove is formed on the outer side wall of the first connection part, and the adapter includes an adapter ring, which is integrally injection-molded on the outer side wall of the first connection part.

10. The battery device according to claim 8, characterized in that, The adapter comprises a first blocking member, which is integrally injection-molded on an end surface of the first connecting portion and is used to block a portion of the medium flow channel.

11. The battery device according to claim 10, wherein The groove is formed on the end surface of the first connecting portion.

12. The battery device according to claim 10, characterized in that, The first blocking member includes a blocking portion, which is used to block the medium flow channel; the adapter also includes a second blocking member, which is arranged in the medium flow channel corresponding to the blocking portion and is used to block the medium flow channel together with the blocking portion.

13. The battery device according to claim 12, characterized in that, The inner wall of the medium flow channel provided with the second blocking member is formed with the groove; and / or, The first blocking member is integrally injection-molded on the surface of the second blocking member.

14. The battery device according to claim 12, characterized in that, A slot is formed on a side of the second blocking member facing the first blocking member, and the blocking portion is engaged with the slot; and / or, The second blocking member includes a reinforcing portion and a second connecting portion connected to each other, the reinforcing portion is connected to the first blocking member via the second connecting portion, the reinforcing portion is configured as a metal member, and the second connecting portion is configured as an injection molded member.

15. The battery device according to claim 8, characterized in that, The current collecting body is connected to the adapter by hot pressing or adhesive bonding; and / or, The current collecting body is configured as an injection molded part.

16. The battery device according to any one of claims 1 to 4, characterized in that, The current collector includes a first current collector and a second current collector. The first current collector is provided with a first current collection space, a first liquid passing port and a second liquid passing port that communicate with the first current collection space. The second current collector is provided with a second current collection space, a third liquid passing port and a fourth liquid passing port that communicate with the second current collection space. The first current collector and the second current collector are respectively arranged at two ends of the heat exchanger along the extension direction. The first current collection space and the second current collection space communicate with the medium flow channel.

17. A heat exchange component, characterized in that, The heat exchange assembly includes a heat exchanger and a current collector. The heat exchanger has at least one medium flow channel inside, and the at least one medium flow channel is used to conduct a heat exchange medium, and the heat exchange medium is used to exchange heat with the battery cell. The current collector is provided with a current collection space and a liquid passing port that communicates with the current collection space, and the current collection space communicates with at least part of the medium flow channel; Wherein, at least one end of the heat exchanger along the extension direction forms a first connection portion, and a partial area of the first connection portion is recessed to form a groove, and at least part of the current collector is integrally injection molded on the first connection portion.

18. An electrical device, characterized in that, It includes the battery device according to any one of claims 1 to 16 or the heat exchange assembly according to claim 17.

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