Battery pack and electric device

Abstract

The invention provides a battery pack and a power utilization device, and relates to the technical field of batteries, the battery pack comprises a battery module and a heat management device, the heat management device comprises a first heat exchange piece and at least one second heat exchange piece, the first heat exchange piece extends along a first direction, and first heat exchange surfaces are formed on two surfaces of the first heat exchange piece in a second direction; the second heat exchange piece extends in the first direction, second heat exchange faces are formed on the two faces, in the third direction, of the second heat exchange piece, containing spaces used for containing the battery modules are formed between at least part of the first heat exchange faces of the first heat exchange piece and the second heat exchange faces of the second heat exchange piece, and the first heat exchange piece is provided with exhaust channels corresponding to the containing spaces; part of the first heat exchange surface is configured as at least one channel wall of the exhaust channel, and the battery module is arranged in the accommodating space in a manner that the pressure relief mechanism faces the exhaust channel and exchanges heat with the first heat exchange surface and the second heat exchange surface. Therefore, the heat exchange efficiency is improved, the risk of short circuit of the battery pack caused by high-temperature emissions is avoided, and the high-temperature emissions can be quickly cooled.

Description

Technical Field

[0001] The present invention relates to the field of battery technology, and in particular to a battery pack and an electrical device. Background Art

[0002] With the transformation of the global energy structure and the development of a low-carbon economy, the field of new energy has gradually become the focus of attention from all walks of life. As the core component of energy storage and conversion, batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric cars, electric motorcycles and electric cars.

[0003] However, as the battery power and energy density increase, the heat generated by the battery system during operation is also increasing. How to quickly remove the heat generated by the battery or quickly heat up the battery is a technical problem that needs to be solved in the battery field. At the same time, the existing thermal management system is isolated from the high-temperature airflow path of thermal runaway and cannot dissipate heat and cool the thermal runaway gas. Summary of the invention

[0004] The purpose of the present application is to provide a battery pack and an electrical device to solve the technical problems in the prior art that the heat exchange efficiency of the thermal management system is low and the emissions generated by thermal runaway cannot be exchanged for heat.

[0005] To achieve the above purpose, the technical solution adopted in this application is:

[0006] In a first aspect, the present application provides a battery pack, comprising: a battery module and a thermal management device, the battery module comprising a plurality of battery cells arranged in sequence along a first direction, the battery cells comprising a pressure relief mechanism; the thermal management device comprising a first heat exchange member and at least one second heat exchange member, the first heat exchange member extending along the first direction and forming a first heat exchange surface on both sides of the second direction, the second heat exchange member extending along the first direction and forming a second heat exchange surface on both sides of the third direction, a receiving space for receiving the battery module is formed between at least a portion of the first heat exchange surface of the first heat exchange member and the second heat exchange surface of the second heat exchange member, the first heat exchange member is provided with an exhaust channel corresponding to each receiving space, a portion of the first heat exchange surface is configured as at least one channel wall of the exhaust channel, the battery module is placed in the receiving space with the pressure relief mechanism facing the exhaust channel and performs heat exchange with the first heat exchange surface and the second heat exchange surface, wherein the first direction is the length direction of the battery module, the second direction is the width direction of the battery module, the third direction is the height direction of the battery module, and the first direction is perpendicular to the second direction and the third direction, respectively.

[0007] In one or more embodiments of the present application, the battery cell includes a cylindrical battery cell, and the second heat exchange surface of the second heat exchange element is an arc-shaped surface consistent with the circumferential side surface of the cylindrical battery cell, so that the second heat exchange surface fits the circumferential side surface of the cylindrical battery cell for heat exchange, and the first heat exchange surface of the first heat exchange element fits the side surface of the cylindrical battery cell having a pressure relief mechanism for heat exchange.

[0008] In one or more embodiments of the present application, the first heat exchange element includes a first heat exchange channel extending in a first direction and allowing a heat exchange medium to flow, the first heat exchange channel includes at least one inlet channel and at least one return channel arranged in a third direction, wherein in each accommodation space, a side wall of at least one inlet channel and at least a portion of a side wall of at least one return channel form a first heat exchange surface of the accommodation space;

[0009] The second heat exchange member includes a second heat exchange channel extending along the first direction and communicating with the first heat exchange channel, and the second heat exchange channel includes a plurality of channels arranged along the second direction.

[0010] In one or more embodiments of the present application, the exhaust channel includes an exhaust groove and a thermal insulation member. The exhaust groove is formed by being recessed from the surface of the first heat exchange member corresponding to at least a portion of the side wall of at least one reflux channel. The exhaust groove passes through the first heat exchange member at both ends along the first direction. The thermal insulation member covers the opening of the exhaust groove away from the reflux channel. A weak structure is provided on the thermal insulation member, and the projection area of ​​the pressure relief mechanism of the battery cell on the thermal insulation member overlaps with at least a portion of the weak structure.

[0011] In one or more embodiments of the present application, the thermal management device also includes a first collecting member and a second collecting member respectively connected to the two ends of the first heat exchanger along the first direction, and a third collecting member and a fourth collecting member respectively connected to the two ends of the second heat exchanger along the first direction. The first collecting member and the third collecting member are configured to connect the inlet channel of the first heat exchange channel and the second heat exchange channel in parallel, and the second collecting member and the fourth collecting member are configured to connect the second heat exchange channel and the return channel of the first heat exchange channel in series, so as to allow the heat exchange medium to enter the inlet channel of the first heat exchanger from the first collecting member and return to the first collecting member from the return channel through the second collecting member, and to allow the heat exchange medium to enter the second heat exchange channel of the second heat exchanger from the third collecting member and enter the second collecting member through the fourth collecting member and return to the first collecting member from the return channel.

[0012] In one or more embodiments of the present application, a first collecting channel and a second collecting channel are provided inside the first collecting member, wherein the first collecting channel is isolated from the second collecting channel, the first collecting channel is connected to the inlet channel, the second collecting channel is connected to the return channel, and the first collecting member is also provided with a first joint connected to the first collecting channel and a second joint connected to the second collecting channel; a third collecting channel is provided inside the second collecting member, the third collecting channel is respectively connected to the inlet channel and the return channel, and the second collecting member is also provided with a third joint connected to the third collecting channel; a first collecting cavity is provided inside the third collecting member, the first collecting cavity is connected to the second heat exchange channel, and the third collecting member is also provided with a fourth joint connected to the first collecting cavity; a second collecting cavity is provided inside the fourth collecting member, the second collecting cavity is connected to the second heat exchange channel, and the fourth collecting member is also provided with a fifth joint connected to the second collecting cavity;

[0013] Among them, a first branch pipe is provided between the first joint of the first collecting part and the fourth joint of the third collecting part, and the first branch pipe is configured to allow the heat exchange medium to enter the first collecting channel and the first collecting cavity respectively; a second branch pipe is provided between the third joint of the second collecting part and the fifth joint of the fourth collecting part, and the second branch pipe is configured to allow the heat exchange medium in the second heat exchange channel to enter the third collecting channel, and the second joint is configured to connect to the main liquid outlet pipe.

[0014] In one or more embodiments of the present application, the first current collecting member and the second current collecting member are both provided with exhaust holes corresponding to the exhaust channels, one end of the exhaust hole is connected to the exhaust channel, and the other end is connected to the outside world, and a slot is provided on the side of the exhaust hole facing the exhaust channel, and the end of the thermal insulation member is inserted into the slot to seal the connection between the exhaust groove and the exhaust hole.

[0015] In one or more embodiments of the present application, a first heat conductor is provided between the battery module and the first heat exchange surface, and the first heat conductor and the heat insulating member are adjacently arranged along the third direction, wherein the thickness of the first heat conductor is d1, and the thickness of the heat insulating member is d2, satisfying: d1-△d=λ×d2, wherein △d is the compressed thickness of the first heat conductor; λ is the thickness difference coefficient, λ=1.1~1.5.

[0016] In one or more embodiments of the present application, a second heat conductor is provided between the second heat exchange surface and the battery module.

[0017] In a second aspect, the present application further provides an electrical device, comprising the battery pack described in any one of the first aspects.

[0018] Based on the above technical solution, the battery pack and the power device of the present application have at least the following beneficial technical effects:

[0019] The thermal management device of the battery pack provided in the present application can form a first heat exchange surface on both sides in the second direction Y, that is, the width direction of the battery module, through the first heat exchange member, and can form a second heat exchange surface on both sides in the third direction Z, that is, the height direction of the battery module, through the second heat exchange member. Therefore, when the battery module is placed in the accommodating space formed by part of the first heat exchange surface and the second heat exchange surface, the battery module can perform heat exchange on the side in the third direction Z and the side in the second direction Y, so that the battery module can perform heat exchange on multiple sides, thereby improving the heat exchange efficiency. At the same time, the thermal management device of the present application is also provided with an exhaust channel, and the battery The battery module is placed in the accommodating space in such a way that the pressure relief mechanism faces the exhaust channel. Therefore, when a battery cell in the battery module experiences thermal runaway, the emissions discharged from its pressure relief mechanism can enter the exhaust channel and be promptly and directionally guided and discharged from the exhaust channel, thereby avoiding the risk of short circuit of the battery pack caused by high-temperature emissions. At the same time, since part of the first heat exchange surface of the first heat exchange element constitutes at least one channel wall of the exhaust channel, the heat exchange medium in the first heat exchange element can also efficiently exchange heat and cool down the high-temperature emissions in the exhaust channel, so that the high-temperature emissions are quickly cooled, thereby avoiding heat transfer of the high-temperature emissions to other battery cells and avoiding the spread of thermal runaway. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the installation structure of the battery module and the thermal management device in the battery pack provided in this application.

[0022] Figure 2 yes Figure 1 Schematic diagram of the explosion structure.

[0023] Figure 3 yes Figure 1 Schematic diagram of the three-dimensional structure of the thermal management device.

[0024] Figure 4 yes Figure 3 Schematic diagram of the longitudinal section of the thermal management device.

[0025] Figure 5 yes Figure 3 Schematic diagram of the exploded structure of the thermal management device.

[0026] Figure 6 It is a schematic diagram of the exploded structure of the first heat exchange component and the heat insulation component in the thermal management device provided in the present application.

[0027] Figure 7 It is a schematic diagram of the three-dimensional structure of the first heat exchange element in the thermal management device provided in the present application.

[0028] Figure 8 It is a schematic diagram of the three-dimensional structure of the first heat exchange element in the thermal management device provided in the present application from another perspective.

[0029] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first current collecting component in the thermal management device provided in the present application.

[0030] Fig.10 It is a schematic diagram of the three-dimensional structure of the second current collecting member in the thermal management device provided in the present application.

[0031] Fig.11 It is a schematic diagram of the rear structural view of the second current collecting component in the thermal management device provided in the present application.

[0032] Fig.12 It is a schematic diagram of the flow direction of the heat exchange medium in the first heat exchange member, the first current collecting member and the second current collecting member in the thermal management device provided in the present application.

[0033] Fig.13 It is a schematic diagram of the three-dimensional structure of the second heat exchange element in the thermal management device provided in the present application.

[0034] Fig.14 It is a schematic diagram of the three-dimensional structure of the third current collecting member in the thermal management device provided in this application.

[0035] Fig.15 It is a schematic diagram of the three-dimensional structure of the fourth current collecting member in the thermal management device provided in the present application.

[0036] In the figure: 10-battery module; 11-battery cell; 20-thermal management device; 21-first heat exchange member; 22-second heat exchange member; 23-first current collector; 24-second current collector; 25-exhaust hole; 26-third current collector; 27-fourth current collector; 29-total liquid outlet pipe; 111-pressure relief mechanism; 200-accommodation space; 201-first heat conduction member; 202-second heat conduction member; 210-first heat exchange surface; 211-exhaust channel; 212-first heat exchange channel; 220-second heat exchange surface; 222- The second heat exchange channel; 231-the first joint; 232-the second joint; 233-the first collecting channel; 234-the second collecting channel; 241-the third joint; 242-the third collecting channel; 251-the slot; 261-the first collecting cavity; 262-the fourth joint; 271-the second collecting cavity; 272-the fifth joint; 281-the first branch pipe; 282-the second branch pipe; 2121-the inlet channel; 2122-the return channel; 2211-the exhaust groove; 2212-the thermal insulation component; 2213-the weak structure. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0041] In the related art, based on the demand for fast charging of batteries, cylindrical batteries have attracted more and more attention due to their shape and high energy rate characteristics. However, the existing thermal management device only exchanges heat with part of the arc surface of the cylindrical battery, and the heat exchange area is limited, which cannot meet the requirements of high temperature and high rate fast charging heat exchange. In addition, when the battery cell has thermal runaway, the explosion-proof valve of the battery cell sprays high-temperature emissions upward or downward. A large amount of conductive media in the high-temperature emissions, such as high-temperature electrolyte, copper foil fragments, etc., are sprayed from the battery cell explosion-proof valve and will be scattered in the battery cell bus, copper bus and other areas, which may easily cause the risk of electrical short circuit arcing. The cooling system of the existing thermal management device is isolated from the flow path of the thermal runaway high-temperature emissions and cannot dissipate heat and cool the emissions.

[0042] Based on the above considerations, in order to solve the technical problem that the existing thermal management system has low heat exchange efficiency and cannot exchange heat for emissions generated by thermal runaway. The present application provides a battery pack, including a battery module and a thermal management device, the battery module includes a plurality of battery cells arranged in sequence along a first direction, and the battery cell includes a pressure relief mechanism; the thermal management device includes a first heat exchange member and at least one second heat exchange member, the first heat exchange member extends along the first direction and forms a first heat exchange surface on both sides of the second direction, the second heat exchange member extends along the first direction and forms a second heat exchange surface on both sides of the third direction, and a storage space for accommodating the battery module is formed between at least part of the first heat exchange surface of the first heat exchange member and the second heat exchange surface of the second heat exchange member, the first heat exchange member is provided with an exhaust channel corresponding to each storage space, part of the first heat exchange surface is configured as at least one channel wall of the exhaust channel, the battery module is placed in the storage space in a manner that the pressure relief mechanism faces the exhaust channel and performs heat exchange with the first heat exchange surface and the second heat exchange surface, wherein the first direction is perpendicular to the second direction and the third direction respectively.

[0043] In the technical solution of the embodiment of the present application, the thermal management device can form a first heat exchange surface on both sides in the second direction Y, that is, the width direction of the battery module, through the first heat exchange element, and can form a second heat exchange surface on both sides in the third direction Z, that is, the height direction of the battery module, through the second heat exchange element. Therefore, when the battery module is placed in the accommodating space formed by part of the first heat exchange surface and the second heat exchange surface, the battery module can perform heat exchange on the side of the third direction Z and the side of the second direction Y, so that the battery module can perform heat exchange on multiple sides, thereby improving the heat exchange efficiency. At the same time, the thermal management device of the present application is also provided with an exhaust channel. Furthermore, the battery module is placed in the accommodating space in such a way that the pressure relief mechanism faces the exhaust channel. Therefore, when a battery cell in the battery module experiences thermal runaway, the emissions discharged from its pressure relief mechanism can enter the exhaust channel and be promptly and directionally guided and discharged from the exhaust channel, thereby avoiding the risk of short circuit of the battery pack caused by high-temperature emissions. At the same time, since part of the first heat exchange surface of the first heat exchange element constitutes at least one channel wall of the exhaust channel, the heat exchange medium in the first heat exchange element can also efficiently exchange heat with the high-temperature emissions in the exhaust channel, so that the high-temperature emissions are quickly cooled, thereby avoiding heat transfer of the high-temperature emissions to other battery cells and avoiding the spread of thermal runaway.

[0044] The battery pack of the present application refers to a physical module including one or more battery modules to provide higher voltage and capacity, and is used in various electrical devices using batteries.

[0045] In a specific embodiment, the battery pack provided in the present application may be a cylindrical battery.

[0046] The technical solution of the present application is described in detail below in conjunction with the accompanying drawings.

[0047] Please refer to Figure 1 and Figure 2 A battery pack provided in the present application includes a battery module 10 and a thermal management device 20, wherein the battery module 10 includes a plurality of battery cells 11 arranged in sequence along a first direction X, wherein the first direction X refers to the length direction of the battery module 10. There may be multiple battery modules 10, each of which includes a plurality of battery cells 11, and the plurality of battery cells 11 may be connected in series, in parallel, or in mixed connection. The battery cell 11 is the smallest unit constituting the battery. The battery cell 11 may be a cylindrical battery cell, and its appearance is cylindrical. The battery cell 11 includes a pressure relief mechanism 111. The pressure relief mechanism 111 is used to timely release the internal pressure when the internal pressure or temperature of the battery cell 11 reaches a threshold value to avoid battery explosion components, such as explosion-proof valves.

[0048] Please refer to Figure 2 The thermal management device 20 includes a first heat exchanger 21 and at least one second heat exchanger 22, wherein the first heat exchanger 21 can be assembled with at least one second heat exchanger 22 to form a whole. The first heat exchanger 21 can be a plate-shaped structure having a heat exchange channel inside, and can be made of metal. The second heat exchanger 22 can also be a plate-shaped structure having a heat exchange channel inside, and can be made of metal. The first heat exchanger 21 is arranged vertically, and the second heat exchanger 22 is arranged horizontally. The first heat exchanger 21 extends along the first direction X and forms a first heat exchange surface 210 on both sides of the second direction Y. The first direction X can be the length direction of the battery module 10, and the second direction Y can be the width direction of the battery module 10. It can be understood that the first heat exchanger 21 has a first heat exchange surface 210 on both sides along the width direction of the battery module 10. The first heat exchange surface 210 is used for heat exchange. The second heat exchanger 22 extends along the first direction X and forms a second heat exchange surface 220 on both sides of the third direction Z, wherein the third direction Z can be the height direction of the battery module 10. The first direction X is perpendicular to the second direction Y and the third direction Z, respectively. It can be understood that the second heat exchange element 22 has a second heat exchange surface 220 on the two sides along the height direction of the battery module 10, and the second heat exchange surface 220 is used for heat exchange. A receiving space 200 for receiving the battery module 10 is formed between at least part of the first heat exchange surface 210 of the first heat exchange element 21 and the second heat exchange surface 220 of the second heat exchange element 22. The battery module 10 is placed in the receiving space 200 and performs heat exchange with the first heat exchange surface 210 and the second heat exchange surface 220. Since the first heat exchange surface 210 faces the second direction Y, that is, the width direction of the battery module 10, and the second heat exchange surface 220 faces the height direction of the battery module 10, when the battery module 10 is placed in the receiving space, the battery module 10 can perform heat exchange with the second heat exchange surface 220 and the first heat exchange surface 210 on the side of the third direction Z and the side of the second direction Y, respectively, so that the battery module 10 can perform heat exchange on multiple sides, thereby improving the heat exchange efficiency.

[0049] In some embodiments, please refer to Figure 2 , Figure 3 and Figure 4 In order to effectively utilize space, save costs and improve heat exchange effect, a first heat exchanger 21 and a second heat exchanger 22 can form two accommodating spaces 200, that is, the first heat exchanger 21 is vertically arranged, and the second heat exchanger 22 is horizontally arranged in the middle of the first heat exchanger 21, so that the first heat exchanger 21 and the second heat exchanger 22 are perpendicular. Of course, please refer to Figure 2 , one first heat exchanger 21 can also form four accommodating spaces 200 with two second heat exchangers 22. The first heat exchanger 21 is arranged vertically, and the two second heat exchangers 22 are respectively arranged horizontally on both sides of the first heat exchanger 21 and perpendicular to the first heat exchanger 21, so that accommodating spaces 200 are formed on the upper and lower sides of the two second heat exchangers 22. Each accommodating space 200 can accommodate a group of battery modules 10, so that a set of thermal management devices 20 can also perform heat exchange on four groups of battery modules 10 at the same time, which can effectively utilize space, reduce production costs, improve heat exchange efficiency, and improve system volume density.

[0050] Please refer to Figure 2 The first heat exchange element 21 is provided with an exhaust channel 211 corresponding to each accommodation space 200. Part of the first heat exchange surface 210 is configured as at least one channel wall of the exhaust channel 211. It can be understood that part of the first heat exchange surface 210 can be used as the channel wall of the exhaust channel 211. The battery module 10 is placed in the accommodating space 200 in such a way that the pressure relief mechanism 111 faces the exhaust channel 211 and performs heat exchange with the first heat exchange surface 210 and the second heat exchange surface 220. Therefore, when a battery cell 11 in the battery module 10 experiences thermal runaway, the high-temperature emissions discharged from its pressure relief mechanism 111 can enter the exhaust channel 211 and be promptly directed and discharged from the exhaust channel 211, thereby avoiding the risk of short circuit of the battery pack caused by the high-temperature emissions. At the same time, since part of the first heat exchange surface 210 of the first heat exchange element 21 constitutes at least one channel wall of the exhaust channel 211, the heat exchange medium in the first heat exchange element 21 can also perform efficient heat exchange and cooling of the high-temperature emissions in the exhaust channel 211, thereby quickly cooling the high-temperature emissions, avoiding heat transfer of the high-temperature emissions to other battery cells, and avoiding the spread of thermal runaway.

[0051] For further information, please refer to Figure 2Since the battery cell 11 is a cylindrical battery cell, in order to better fit the circumferential side of the cylindrical battery cell, the second heat exchange surface 220 of the second heat exchange member 22 is in an arc shape consistent with the circumferential side of the cylindrical battery cell, so that the second heat exchange surface 220 fits with the circumferential side of the cylindrical battery cell for heat exchange. Since the battery module 10 includes multiple battery cells, the second heat exchange surface 220 corresponds to an arc structure at each battery cell 11 position. Therefore, the multiple arc structures make the second heat exchange surface 220 wavy. In this way, the second heat exchange surface 220 of the second heat exchange member 22 can have more fitting surfaces with the circumferential surface of the cylindrical battery cell for heat exchange, thereby improving the heat exchange efficiency.

[0052] Please refer to Figure 1 and Figure 2 , the first heat exchange surface 210 of the first heat exchange element 21 is attached to the side of the cylindrical battery cell with the pressure relief mechanism 111 for heat exchange. In a specific embodiment, the pressure relief mechanism 111 is arranged on the bottom surface of the cylindrical battery cell, that is, the bottom surface in the height direction of the cylindrical battery cell, so that the bottom surface of the cylindrical battery cell can be attached to the first heat exchange surface 210 for heat exchange. In this way, heat exchange can be performed on both the side and bottom surfaces of the cylindrical battery cell to improve the heat exchange efficiency.

[0053] For further information, please refer to Figure 6 , Figure 7 and Figure 8 The first heat exchange element 21 includes a first heat exchange channel 212 extending along the first direction X and allowing the heat exchange medium to flow. The first heat exchange channel 212 includes at least one inlet channel 2121 and at least one return channel 2122 arranged along the third direction Z. Figure 4 In each accommodating space 200 , a side wall of at least one inlet channel 2121 and at least a portion of a side wall of at least one return channel 2122 form a first heat exchange surface 210 of the accommodating space 200 .

[0054] It is understandable that the first heat exchange surface 210 of each accommodating space 200 is composed of at least one side wall of the inlet channel 2121 and at least part of the side of the at least one return channel 2122. Then, when the battery module 10 in each accommodating space 200 is in contact with the first heat exchange surface 210 for heat exchange, since the temperature of the heat exchange medium in the return channel 2122 is relatively high and the temperature of the heat exchange medium in the inlet channel 2121 is relatively low, it can preferentially exchange heat with the battery module 10, thereby improving the heat exchange efficiency, and balancing the temperature of each battery cell 11 through the heat exchange medium in the return channel 2122, thereby avoiding the problem of a large overall temperature difference of the battery module 10 caused by the temperature difference between the front and rear sections of the battery module 10 due to the excessively long flow path of the heat exchange medium.

[0055] The number of the inlet channels 2121 and the return channels 2122 can be adjusted according to the structural strength of the first heat exchange element 21. In a specific embodiment, for example Figure 4 and Figure 6 As shown, the first heat exchange channel 212 includes two inlet channels 2121 and three return channels 2122 arranged along the third direction Z, wherein the two inlet channels 2121 are arranged on the upper and lower sides of the first heat exchange member 21, so that each inlet channel 2121 is located in four accommodating spaces 200. The three return channels 2122 are arranged in sequence in the middle of the two inlet channels 2121, and the large return channel 2122 is located in the middle of the two small return channels 2122. In this way, the first heat exchange surface 210 of each accommodating space 200 is composed of an inlet channel 2121, a small return channel 2122 and the side of half of the large return channel 2122. In this way, the heat exchange area of ​​the first heat exchange surface 210 of the upper and lower accommodating spaces 200 can be consistent, and the heat exchange effect of each battery module 10 can be consistent. At the same time, the temperature difference of the bottom surface of the battery along the length direction can be balanced to avoid excessive temperature difference. The multiple reflux channels can significantly reduce the pressure drop of the overall circulation system, thereby reducing the energy consumption of the system water pump; at the same time, the overall structural strength of the first heat exchange element 21 is also improved.

[0056] For further information, please refer to Figure 4 and Figure 5 The second heat exchange member 22 includes a second heat exchange channel 222 extending along the first direction X and communicating with the first heat exchange channel 212. The second heat exchange channel 222 includes a plurality of second heat exchange channels arranged along the second direction Y. It is understandable that each of the plurality of second heat exchange channels 222 may be a straight-through type, or the plurality of second heat exchange channels 222 may form a "Z"-shaped flow channel. This allows the heat exchange medium to flow in the second heat exchange channel 222, thereby exchanging heat on the side of the battery module 10 and improving the heat exchange efficiency.

[0057] For further information, please refer to Figure 5 , Fig. 9 and Fig.12The thermal management device 20 further includes a first current collecting member 23 and a second current collecting member 24 respectively connected to both ends of the first heat exchange member 21 along the first direction X, and a third current collecting member 26 and a fourth current collecting member 27 respectively connected to both ends of the second heat exchange member 22 along the first direction X. The first current collecting member 23 and the third current collecting member 26 are configured to connect the inlet channel 2121 of the first heat exchange channel 212 and the second heat exchange channel 222 in parallel, and the second current collecting member 24 and the fourth current collecting member 27 are configured to connect the inlet channel 2121 of the first heat exchange channel 212 and the second heat exchange channel 222 in parallel. The inlet channel 222 and the return channel 2122 of the first heat exchange channel 212 are connected in series to allow the heat exchange medium to enter the inlet channel 2121 of the first heat exchange member 21 from the first collecting member 23 and return to the first collecting member 23 from the return channel 2122 via the second collecting member 24, and to allow the heat exchange medium to enter the second heat exchange channel 222 of the second heat exchange member 22 from the third collecting member 26 and enter the second collecting member 24 via the fourth collecting member 27 and return to the first collecting member 23 from the return channel 2122.

[0058] It can be understood that in order to allow the heat exchange medium to enter the first heat exchange element 21 and the second heat exchange elements 22 on both sides in parallel at the same time, a first collector 23 is set at the end of the first heat exchange element 21, and a third collector 26 is set at the end of each second heat exchange element 22, so that the heat exchange medium can enter the first heat exchange element 21 and the second heat exchange element 22 in three parallel ways to exchange heat with the battery module 10. Since the temperature of the heat exchange medium at the inlet is relatively low, rapid and effective heat exchange can be achieved on multiple sides of the battery cell 11, thereby improving the heat exchange efficiency. At the same time, in order to realize the circulation and reflux of the heat exchange medium, a second collecting member 24 is set at the other end of the first heat exchanger 21, and a fourth collecting member 27 is also set at the other end of each second heat exchanger 22. The fourth collecting member 27 is connected to the second collecting member 24, so that the heat exchange medium in the second heat exchange channel 222 in the second heat exchanger 22 can be collected in series to the second collecting member 24 at the other end, and return from the reflux channel 2122 of the second collecting member 24 to the first collecting member 23 for discharge, thereby realizing the circulation heat exchange of the heat exchange medium in the thermal management device and improving the heat exchange effect. The thermal management device 20 can integrate the heat exchange channels of the first heat exchanger 21 and all the second heat exchangers 22, which can reduce the components of the thermal management device and reduce the cost. At the same time, the first heat exchanger 21 and the second heat exchanger 22 are integrated into an integral structure, which can also save layout space and improve the system volume density.

[0059] For further information, please refer to Fig. 9, the first current collecting member 23 is plug-connected with the first heat exchange member 21. A first collecting channel 233 and a second collecting channel 234 are provided inside the first current collecting member 23, wherein the first collecting channel 233 is isolated from the second collecting channel 234, that is, the first collecting channel 233 and the second collecting channel 234 are not connected. The first collecting channel 233 is connected with the inlet channel 2121, and the first collecting channel 233 is used to allow the heat exchange medium to enter and flow into the inlet channel 2121 of the first heat exchange member 21. Since the inlet channel 2121 of the first heat exchange member 21 is located on both sides of the height direction of the first heat exchange member 21, two first collecting channels 233 are also provided, and are respectively connected with the two inlet channels 2121, so that the heat exchange medium can simultaneously enter the inlet channel 2121 connected to it from the first collecting channel 233. The second collecting channel 234 is connected to the return channel 2122, and is used to allow the heat exchange medium to return from the return channel 2122. Therefore, the first collecting channel 233 and the second collecting channel 234 need to be isolated to prevent the heat exchange medium from affecting each other.

[0060] Please refer to Fig. 9 The first current collecting member 23 is also provided with a first joint 231 connected to the first collecting channel 233 and a second joint 232 connected to the second collecting channel 234. In some embodiments, the two sides of the first current collecting member 23 are respectively connected to the first joints 231 connected to the internal first collecting channel 233, the first joint 231 can be connected to the first branch pipe 281, one end of the first branch pipe 281 away from the first joint 231 is connected to the main liquid inlet pipe, and the second joint 232 can be connected to the main liquid outlet pipe 29, so that the heat exchange medium enters the first collecting channel 233 from the first joint 231, and then enters the inlet channel 2121 of the first heat exchange member 21, and the heat exchange medium returned from the reflux channel 2122 after heat exchange enters the second collecting channel 234 and is discharged from the second joint 232. The connection between the first joint 231 and the first branch pipe 281, and the connection between the second joint 232 and the main liquid outlet pipe 29 can be plug-in.

[0061] For further information, please refer to Figure 5 , Fig.13 and Fig.14 , the third current collecting member 26 is plugged into the second heat exchange member 22. A first collecting chamber 261 is provided in the third current collecting member 26, and the first collecting chamber 261 is connected to the second heat exchange channel 222. It can be understood that the first collecting chamber 261 is a cavity structure in the third current collecting member 26, and one end of the first collecting chamber 261 is open, so that the third current collecting member 26 is plugged into the second heat exchange member 22, and the first collecting chamber 261 collects the heat exchange medium so that the heat exchange medium enters the second heat exchange channel 222 at the same time.

[0062] For further information, please refer to Figure 3and Figure 5 The third current collector 26 is also provided with a fourth joint 262 connected to the first current collector 261. The fourth joint 262 can be connected to the first branch pipe 281, so that the heat exchange medium enters the first current collector channel 233 of the first current collector 23 and is simultaneously divided into the first current collector 261 and then enters the second heat exchange channel 222. The fourth joint 262 is plugged into the first branch pipe 281.

[0063] For further information, please refer to Figure 5 , Fig.10 and Fig.11 The second current collecting member 24 is plugged into the first heat exchange member 21. A third current collecting channel 242 is provided inside the second current collecting member 24. The third current collecting channel 242 is connected to the inlet channel 2121 and the return channel 2122 respectively.

[0064] It can be understood that the third collecting channel 242 is a groove-shaped cavity in the second collecting component 24, and the third collecting channel 242 connects the inlet channel 2121 and the return channel 2122 at the end of the first heat exchange component 21 away from the first collecting component 23, so that the heat exchange medium in the inlet channel 2121 enters the return channel 2122 and returns to the first collecting component 23 after being gathered in the third collecting channel 242.

[0065] For further information, please refer to Figure 5 and Fig.15 The fourth collector 27 is plugged into the second heat exchanger 22. A second collector cavity 271 is provided in the fourth collector 27, and the second collector cavity 271 is connected to the second heat exchange channel 222. It can be understood that the second collector cavity 271 is a groove-shaped cavity in the fourth collector 27, so as to collect the heat exchange medium after heat exchange in the second heat exchange channel 222.

[0066] For further information, please refer to Figure 5 and Fig.15 , the fourth current collecting part 27 is also provided with a fifth joint 272 connected to the second current collecting cavity 271. The second current collecting part 24 is also provided with a third joint 241 connected to the third current collecting channel 242. A second branch pipe 282 is provided between the third joint 241 and the fifth joint 272, one end of the second branch pipe 282 is connected to the fifth joint 272, and the other end is connected to the third joint 241, so that the heat exchange medium after heat exchange in the second heat exchange channel 222 is converged from the second branch pipe 282 to the third current collecting channel 242. The problem of complex joint and pipeline arrangement in the multi-branch parallel scheme can be avoided. The third joint 241 and the fifth joint 272 are respectively plugged into the second branch pipe 282.

[0067] In this way, the entire thermal management device 20 can have only one main liquid inlet pipe and one main liquid outlet pipe 29, and the heat exchange medium can enter the first collector 23 and two third collectors 26 in three ways from one of the first branch pipes 281 connected to the main liquid inlet pipe, and then enter the inlet channel 2121 of the first heat exchanger 21 and the second heat exchange channel 222 of the second heat exchanger 22, and after heat exchange on the circumferential side and bottom side of each battery cell 11 along the length direction of the battery module 10, enter the fourth collector 27 and the second collector 24, and return from the reflux channel 2122 of the first heat exchanger 21 after being collected in the second collector 24, and discharged from the main liquid outlet pipe 29. The entire thermal management device 20 of the present application can be compatible with the installation size tolerance of the battery module, which is conducive to the operational convenience of the actual production process.

[0068] For further information, please refer to Figure 6 , the exhaust channel 211 can be arranged on the left and right sides of the first heat exchange member 21, and corresponding to each accommodating space 200, then the exhaust channel 211 can be arranged with 4 symmetrical left and right and up and down. The exhaust channel 211 includes an exhaust groove 2211 and a heat insulating member 2212, and the exhaust groove 2211 is formed by the surface of the first heat exchange member 21 corresponding to at least a portion of the side wall of at least one reflux channel 2122 being concave. It can be understood that the exhaust channel 211 is formed by the exhaust groove 2211 and the heat insulating member 2212 on the first heat exchange member 21. Since the exhaust channel 211 is arranged corresponding to the pressure relief mechanism 111 of the battery cell 11, and the battery cell 11 does not need heat exchange at the position of the pressure relief mechanism 111, in some embodiments, the exhaust groove 2211 is concave corresponding to the side wall of the reflux channel 2122, so as to form the exhaust groove 2211 on the outside of at least a portion of the side wall of the reflux channel 2122. Thus, under normal circumstances, the exhaust channel 211 is filled with an air layer, which can reduce the heat exchange between the heat exchange medium in the return channel 2122 and the outside, reduce the cold dissipation of the heat exchange medium in the return channel 2122, and facilitate rapid heat exchange of the high-temperature airflow in the event of thermal runaway. In some embodiments, the exhaust slot 2211 can be arranged corresponding to the small return channel 2122.

[0069] In order to facilitate the discharge of high-temperature exhaust during thermal runaway, the exhaust groove 2211 passes through the first heat exchange member 21 at both ends along the first direction X. The heat insulating member 2212 covers the opening of the exhaust groove 2211 away from the return channel 2122. Both sides of the heat insulating member 2212 can be bonded to the outside of the return channel 2122, so as to form an exhaust channel 211 between the heat insulating member 2212 and the exhaust groove 2211.

[0070] Please refer to Figure 6 and Figure 7In some embodiments, a weak structure 2213 is provided on the heat insulating member 2212, and the projection area of ​​the pressure relief mechanism 111 of the battery cell 11 on the heat insulating member 2212 overlaps with at least a portion of the weak structure 2213. It is understandable that the projection area of ​​the bottom of the battery cell 11 on the surface of the heat insulating member 2212 should overlap with the weak structure 2213 in at least a portion of the area, or completely overlap, to ensure that after the thermal runaway is triggered, the high-temperature airflow will open the weak structure 2213 and smoothly enter the exhaust channel 211, while taking into account that the heat exchange area at the bottom of the battery cell is not too small to affect the heat exchange efficiency of thermal management.

[0071] Among them, in some embodiments, the thickness of the weak structure 2213 is less than the thickness of other areas of the thermal insulation 2212. In order to realize the setting of the weak structure 2213 on the thermal insulation 2212, a plurality of spaced through holes can be set on the thermal insulation 2212, and then a diaphragm with a thickness less than that of the thermal insulation 2212 is attached to the thermal insulation 2212 and covers all through holes on all the thermal insulation 2212, so as to form the weak structure 2213 at the through holes of the thermal insulation 2212. In order to make the thermal insulation 2212 serve as the side wall of the exhaust channel 211, the thermal insulation 2212 needs to have a certain strength, and the thickness of the thermal insulation 2212 can be set at 1-2 mm. At the same time, in order to make the weak structure 2213 easy to be broken in the case of thermal runaway, the thickness of the diaphragm can be 0.1-0.3 mm.

[0072] Of course, in some other embodiments, part of the thermal insulation member 2212 may be directly notched by removing part of the material to form a weak structure 2213. For example, the thermal insulation member 2212 may be notched in a certain area, such as a circular ring or a dotted ring, by removing 50% to 80% of the material of the total thickness to form a weak structure 2213. At this time, the thickness of the weak structure 2213 is equal to the thickness of other areas of the thermal insulation member 2212, and the thickness is thinned only at the notches, which is conducive to easily breaking through the notches and separating the weak structure 2213 from other areas of the thermal insulation member 2212 in the event of thermal runaway, so that the high temperature caused by thermal runaway enters the exhaust passage 211.

[0073] In some embodiments, the heat insulating member 2212 may be made of mica sheets or ceramic silicone materials having high thermal shock resistance, so that the heat insulating member 2212 can withstand the temperature of high-temperature exhaust in the exhaust passage.

[0074] In some embodiments, please refer to Figure 5 , Fig. 9 and Fig.10The first current collecting member 23 and the second current collecting member 24 are both provided with exhaust holes 25 corresponding to the exhaust channel 211. The exhaust holes 25 are structures isolated from the first current collecting channel 233, the second current collecting channel 234 or the third current collecting channel 242, and can penetrate the exhaust channel 211 and the outside. One end of the exhaust hole 25 is connected to the exhaust channel 211, and the other end is connected to the outside, so that when thermal runaway occurs, the high-temperature gas in the exhaust channel 211 can be discharged to the outside from the exhaust holes 25 at both ends to reduce the internal pressure.

[0075] Please refer to Fig. 9 and Fig.10 , a slot 251 is provided on the side of the exhaust hole 25 facing the exhaust channel 211. The slot 251 is a concave structure on the side of the exhaust hole 25 facing the first heat exchanger 21 and the outer wall of the first collector 23 or the second collector 24, so that the end of the heat insulation member 2212 can be plugged into the slot 251 to seal the connection between the exhaust slot 2211 and the exhaust hole 25, avoiding the problem of airflow overflow during the entire thermal runaway airflow process. The middle part of the heat insulation member 2212 can be bonded to the surface of the first heat exchanger 21 to improve stability, and the slot 251 is connected to the exhaust hole 25, so that the exhaust channel 211 is extended to the ends of the first collector 23 and the second collector 24.

[0076] When a battery cell has thermal runaway, since both ends of the single exhaust channel 211 of the first heat exchanger 21 are connected, the high-temperature airflow will flow to both ends, thereby reducing the internal pressure of the exhaust channel 211. At the same time, the exhaust channel 211 that is longer along the battery cell arrangement direction can store a large amount of thermal runaway high-temperature debris and unburned electrolyte, which can completely prevent the conductive medium generated by thermal runaway from scattering in the gap area of ​​the battery cell bus, thereby avoiding the risk of thermal runaway electrical arcing and short circuit. In addition, when the thermal runaway high-temperature airflow enters the exhaust channel 211 of the first heat exchanger 21, since the middle position of the exhaust channels 211 on both sides corresponds to the first heat exchange channel 212, that is, the high-temperature exhaust channel 211 is separated from the heat exchange medium by only a thin layer of aluminum wall, it is possible to achieve rapid cooling of the high-temperature airflow, thereby avoiding the heat transfer effect of the high-temperature airflow on other normal battery cells 11. In addition, due to the heat insulation effect of the heat insulation member 2212, the heat exchange of the high-temperature airflow exhaust process to the bottom of the normal battery cell 11 is also reduced, and the purpose of thermal runaway safety can be finally achieved. The thermal management device 20 of the present application has a high degree of integration, and the heat exchange channel and the exhaust channel 211 can be integrated into one, thereby improving the volume utilization of the battery pack.

[0077] In some embodiments, please refer to Figure 8In order to ensure rapid heat exchange between the battery module 10 and the first heat exchange surface 210, a first heat conductive member 201 is provided between the battery module 10 and the first heat exchange surface 210, and the first heat conductive member 201 may have good thermal conductivity. The first heat conductive member 201 and the heat insulating member 2212 are arranged adjacent to each other along the third direction Z. The first heat conductive member 201 may be made of a flexible material such as a silicone pad. The first heat conductive member 201 may be provided in all areas of the first heat exchange member 21 except the heat insulating member 2212.

[0078] During the stacking and assembly of the battery cells 11 of the battery module 10, in order to ensure the fit of the first heat conductive member 201 with the bottom surface of the battery cell 11 and avoid the excessive gap between the battery cell 11 and the weak structure 2213 of the heat insulating member 2212 to affect the sealing effect of thermal runaway exhaust, it is necessary to apply pre-tightening pressure along the height direction of the battery cell 11 during assembly. Therefore, during the pressure application process, the first heat conductive member 201 will be compressed due to being a flexible material, and the thickness after compression and the thickness of the heat insulating member 2212 need to meet the following conditions: d1-△d=λ×d2, where △d is the compressed thickness of the first heat conductive member 201; λ is the thickness difference coefficient, λ=1.1~1.5. Wherein, d1 is the uncompressed thickness of the first heat conductive member 201, and d2 is the thickness of the heat insulating member 2212, thereby ensuring that the thickness between the first heat conductive member 201 and the heat insulating member 2212 is within a reasonable range, so as to simultaneously meet the requirements of the heat conduction of the battery cells and the sealing of thermal runaway.

[0079] For further information, please refer to Figure 2 and Figure 3 In order to ensure rapid heat exchange between the battery module 10 and the second heat exchange surface 220, a second heat conductive member 202 is provided between the second heat exchange surface 220 and the battery module 10. The second heat conductive member 202 has good thermal conductivity, and the second heat conductive member 202 can be a flexible material, such as a silicone pad material. The second heat conductive member 202 can be wavy so that it can be well and tightly fitted between the battery cell 11 and the second heat exchange surface 220, thereby improving the heat exchange effect and heat exchange efficiency.

[0080] On the other hand, the present application also provides an electrical device, including the aforementioned battery pack. The electrical device can be a power source for the electrical device, or it can be an energy storage unit for the electrical device. The electrical device can include mobile devices (such as mobile phones, laptops, etc.), electric vehicles (such as pure electric vehicles, hybrid electric vehicles, plug-in hybrid electric vehicles, electric bicycles, electric scooters, electric golf carts, electric trucks, etc.), electric trains, ships and satellites, energy storage systems, etc., but are not limited to these.

[0081] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that: include: A battery module (10) comprising a plurality of battery cells (11) arranged in sequence along a first direction (X), wherein the battery cells (11) include a pressure relief mechanism (111); A thermal management device (20) comprises a first heat exchange member (21) and at least one second heat exchange member (22), wherein the first heat exchange member (21) extends along the first direction (X) and forms a first heat exchange surface (210) on both sides of the second direction (Y), and the second heat exchange member (22) extends along the first direction (X) and forms a second heat exchange surface (220) on both sides of the third direction (Z), and a receiving space (200) for receiving the battery module (10) is formed between at least a portion of the first heat exchange surface (210) of the first heat exchange member (21) and the second heat exchange surface (220) of the second heat exchange member (22), and the first heat exchange member (21) is provided with an exhaust port corresponding to each of the receiving spaces (200) channel (211), part of the first heat exchange surface (210) is configured as at least one channel wall of the exhaust channel (211), the battery module (10) is placed in the accommodating space (200) in a manner that the pressure relief mechanism (111) faces the exhaust channel (211) and performs heat exchange with the first heat exchange surface (210) and the second heat exchange surface (220), wherein the first direction (X) is the length direction of the battery module (10), the second direction (Y) is the width direction of the battery module (10), the third direction (Z) is the height direction of the battery module (10), and the first direction (X) is perpendicular to the second direction (Y) and the third direction (Z), respectively.

2. The battery pack according to claim 1, characterized in that: The battery cell (11) comprises a cylindrical battery cell, the second heat exchange surface (220) of the second heat exchange element (22) is in an arc shape consistent with the circumferential side surface of the cylindrical battery cell, so that the second heat exchange surface (220) and the circumferential side surface of the cylindrical battery cell are in contact with each other for heat exchange, and the first heat exchange surface (210) of the first heat exchange element (21) and the side surface of the cylindrical battery cell having the pressure relief mechanism (111) are in contact with each other for heat exchange.

3. The battery pack according to claim 1, characterized in that: The first heat exchange element (21) comprises a first heat exchange channel (212) extending along the first direction (X) and allowing a heat exchange medium to flow, the first heat exchange channel (212) comprising at least one inlet channel (2121) and at least one return channel (2122) arranged along the third direction (Z), wherein, in each of the accommodating spaces (200), a side wall of at least one inlet channel (2121) and at least a portion of a side wall of at least one return channel (2122) form the first heat exchange surface (210) of the accommodating space (200); The second heat exchange element (22) comprises a second heat exchange channel (222) extending along the first direction (X) and connected to the first heat exchange channel (212), and the second heat exchange channel (222) comprises a plurality of second heat exchange channels (222) arranged along the second direction (Y).

4. The battery pack according to claim 3, characterized in that: The exhaust channel (211) comprises an exhaust groove (2211) and a heat insulating member (2212); the exhaust groove (2211) is formed by being recessed from at least a portion of the side wall of at least one of the reflux channels (2122) corresponding to the surface of the first heat exchange member (21); the exhaust groove (2211) passes through the first heat exchange member (21) at both ends along the first direction (X); the heat insulating member (2212) covers an opening of the exhaust groove (2211) away from the reflux channel (2122); a weak structure (2213) is provided on the heat insulating member (2212); and a projection area of ​​the pressure relief mechanism (111) of the battery cell (11) on the heat insulating member (2212) overlaps with at least a portion of the weak structure (2213).

5. The battery pack according to claim 4, characterized in that: The thermal management device (20) further comprises a first current collecting member (23) and a second current collecting member (24) respectively connected to the two ends of the first heat exchange member (21) along the first direction (X), and a third current collecting member (26) and a fourth current collecting member (27) respectively connected to the two ends of the second heat exchange member (22) along the first direction (X), wherein the first current collecting member (23) and the third current collecting member (26) are configured to connect the inlet channel (2121) of the first heat exchange channel (212) and the second heat exchange channel (222) in parallel, and the second current collecting member (24) and the fourth current collecting member (27) are configured to connect the second heat exchange channel (2121) and the second heat exchange channel (222) in parallel. The heat exchange medium is connected in series with the inlet channel (2121) of the first heat exchange member (21) and the return channel (2122) of the first heat exchange channel (212) to allow the heat exchange medium to enter the inlet channel (2121) of the first heat exchange member (21) from the first collector (23) and return to the first collector (23) from the return channel (2122) through the second collector (24), and to allow the heat exchange medium to enter the second heat exchange channel (222) of the second heat exchange member (22) from the third collector (26) and enter the second collector (24) through the fourth collector (27) and return to the first collector (23) from the return channel (2122).

6. The battery pack according to claim 5, characterized in that: A first collecting channel (233) and a second collecting channel (234) are provided inside the first collecting member (23), wherein the first collecting channel (233) is isolated from the second collecting channel (234), the first collecting channel (233) is connected to the inlet channel (2121), and the second collecting channel (234) is connected to the return channel (2122), and the first collecting member (23) is also provided with a first joint (231) connected to the first collecting channel (233) and a second joint (232) connected to the second collecting channel (234); A third collecting channel (242) is provided inside the second collecting member (24), the third collecting channel (242) being connected to the inlet channel (2121) and the return channel (2122) respectively, and a third joint (241) connected to the third collecting channel (242) is also provided on the second collecting member (24); The third current collecting member (26) is provided with a first collecting chamber (261), the first collecting chamber (261) is connected to the second heat exchange channel (222), and the third current collecting member (26) is also provided with a fourth joint (262) connected to the first collecting chamber (261); The fourth current collecting member (27) is provided with a second current collecting chamber (271), the second current collecting chamber (271) is connected to the second heat exchange channel (222), and the fourth current collecting member (27) is also provided with a fifth joint (272) connected to the second current collecting chamber (271); A first branch pipe (281) is provided between the first joint (231) of the first collecting member (23) and the fourth joint (262) of the third collecting member (26), and the first branch pipe (281) is configured to allow the heat exchange medium to enter the first collecting channel (233) and the first collecting chamber (261) respectively; a second branch pipe (282) is provided between the third joint (241) of the second collecting member (24) and the fifth joint (272) of the fourth collecting member (27), and the second branch pipe (282) is configured to allow the heat exchange medium in the second heat exchange channel (222) to enter the third collecting channel (242), and the second joint (232) is configured to be connected to the main liquid outlet pipe (29).

7. The battery pack according to claim 5, characterized in that: The first current collecting member (23) and the second current collecting member (24) are both provided with exhaust holes (25) corresponding to the exhaust channel (211); one end of the exhaust hole (25) is connected to the exhaust channel (211), and the other end is connected to the outside; a slot (251) is provided on one side of the exhaust hole (25) facing the exhaust channel (211); an end of the heat insulating member (2212) is inserted into the slot (251) to seal the connection between the exhaust groove (2211) and the exhaust hole (25).

8. The battery pack according to claim 4, characterized in that: A first heat conducting member (201) is provided between the battery module (10) and the first heat exchange surface (210), and the first heat conducting member (201) and the heat insulating member (2212) are arranged adjacent to each other along a third direction (Z), wherein the thickness of the first heat conducting member (201) is d1, and the thickness of the heat insulating member (2212) is d2, satisfying: d1-Δd=λ×d2, wherein Δd is the compressed thickness of the first heat conducting member (201); and λ is a thickness difference coefficient, λ=1.1-1.

5.

9. The battery pack according to claim 1, characterized in that: A second heat conducting member (202) is provided between the second heat exchange surface (220) and the battery module (10).

10. An electrical device, characterized in that: A battery pack comprising any one of claims 1 to 9.

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