Battery pack and electric device

Abstract

The application provides a battery pack and an electric device, and relates to the technical field of battery packs. The battery pack comprises a heat exchange assembly and a battery. The heat exchange assembly comprises: a plurality of heat exchange pieces, and the battery is placed between adjacent heat exchange pieces; and a heat exchange pipe connects two adjacent heat exchange pieces, wherein the heat exchange pipe comprises: a body part extending in a first direction, an expansion part connected to at least one end of the body part in the first direction, the inner diameter of the expansion part increasing in the direction in which the body part points to the expansion part, the expansion part having a first distance A mm between two end faces in the first direction, a first convex rib connected to a position close to the at least one end of the body part, the first convex rib being arranged on the outer circumferential side of the body part, the side face of the first convex rib close to the end face of the body part to the face where the expansion part and the body part are connected having a second distance B mm, and 0.2 <= A / B <= 1. The battery pack and the electric device can facilitate the automatic installation of pipelines, and improve the installation efficiency and stability.

Description

Technical Field

[0001] This application relates to the field of battery pack technology, specifically to a battery pack and an electrical device. Background Technology

[0002] As the power source for electrical devices, battery packs contain multiple individual battery cells that generate heat during charging and discharging. To exchange this heat, multiple heat exchange plates and heat exchange tubes connecting the plates are installed. Automated installation between adjacent heat exchange plates is achieved by a robotic arm gripping the heat exchange tubes at specific clamping sections. If the clamping sections are not designed properly, the robotic arm may have difficulty gripping the tubes, or the end faces of the heat exchange tubes may deform after gripping. Therefore, improving installation efficiency and stability has become an important research direction in this field. Utility Model Content

[0003] In view of this, one aspect of the present invention provides a battery pack with a rationally designed clamping section to improve automated installation efficiency and installation stability. Another aspect of the present invention provides an electrical device including the aforementioned battery pack.

[0004] To achieve the above objectives, this application provides the following technical solution: In a first aspect, one embodiment of this application provides a battery pack, including a heat exchange assembly and a plurality of batteries arranged at intervals. The heat exchange assembly includes: a plurality of heat exchange elements, spaced apart along a first direction, the first direction being parallel to the arrangement direction of the plurality of batteries, the batteries being placed between adjacent heat exchange elements, and the heat exchange elements being configured to provide heat exchange for the batteries; and a heat exchange tube, connecting two adjacent heat exchange elements, the heat exchange tube being configured to allow a heat exchange medium to flow between the plurality of heat exchange elements; wherein the heat exchange tube includes: a body portion extending along the first direction; an expansion portion connected to at least one end of the body portion in the first direction, the inner diameter of the expansion portion increasing along the direction from the body portion to the expansion portion, and a first distance Amm between the two end faces of the expansion portion in the first direction; and a first rib connected to a position near at least one end of the body portion, the first rib being disposed on the outer periphery of the body portion, and a second distance Bmm from the side of the first rib near the end face of the body portion to the surface where the expansion portion connects to the body portion, 0.2≤A / B≤1.

[0005] Secondly, embodiments of this application also provide an electrical device, including the battery pack described above.

[0006] The battery pack and power supply device provided in this application embodiment are configured with a heat exchange tube consisting of a main body and an expansion portion arranged along a first direction. The main body is provided with a first rib, and the distance from the side of the first rib near the end face of the main body 21 to the surface where the expansion portion 22 connects to the main body 21 is set as a second distance B mm (as a clamping section). The distance between the two end faces of the expansion portion in the first direction is set as a first distance A mm, where 0.2 ≤ A / B ≤ 1. If A / B is too large, the position of the robotic arm clamping the heat exchange tube will be closer to the end face of the heat exchange tube, making the end face of the heat exchange tube more prone to deformation and making it difficult to insert the mating part into the heat exchange tube, thus reducing installation efficiency. If A / B is too small, the robotic arm will have difficulty clamping the heat exchange tube, affecting installation efficiency. This application reasonably limits A / B, that is, it reasonably designs the position and length of the clamping section and the size of the expansion part for the robotic arm to grip, so that the robotic arm can quickly position and clamp the heat exchange tube to the clamping section without squeezing the expansion part, eliminating the need for repeated clamping and positioning, and avoiding deformation of the expansion part, thereby improving the efficiency and stability of automated installation of heat exchange tubes. Attached Figure Description

[0007] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0008] Figure 1 This is a perspective view of a battery pack provided in an embodiment of this application.

[0009] Figure 2 This is a schematic diagram of a heat exchange component and a battery in conjunction, provided as an embodiment of this application.

[0010] Figure 3 This is a front view of a heat exchange component provided in an embodiment of this application.

[0011] Figure 4 This is a top view of a heat exchange component provided in an embodiment of this application.

[0012] Figure 5 This is a front view of a heat exchange tube in a heat exchange assembly provided in an embodiment of this application.

[0013] Figure 6 This is a front view of a heat exchange tube in another heat exchange assembly provided in an embodiment of this application.

[0014] Figure 7 This is a cross-sectional view of a heat exchange tube in a heat exchange assembly provided in an embodiment of this application.

[0015] Figure label: 100. Battery pack; 10. Heat exchange assembly; 1. Heat exchange element; 11. Heat exchange plate; 12. Extension; 1a. Heat exchange pipeline; 1b. First docking part; 1c. Second docking part; 2. Heat exchange tube; 21. Body; 211. Inner tube section; 212. Outer tube section; 22. Expansion part; 22a. First inclined tube wall; 22b. Second inclined tube wall; 221. Extension section; 222. Outward expansion section; 223. Inner expansion tube section; 224. Outer expansion tube section; 2241. Extension sub-section; 2242. Outer expansion sub-section; 23. First rib; 24. Second rib; 2a. Inner tube; 2b. Outer tube; 20. Battery; 30. Housing; X. First direction; Y. Second direction; Z. Vertical direction. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] A battery pack, as a rechargeable energy storage device, is used in electrical devices to provide electrical energy. For example, electrical devices can be mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools, etc., without specific limitations. For ease of explanation, this application embodiment applies the battery pack to a vehicle, i.e., the electrical device is set as a vehicle, which includes, but is not limited to, gasoline-powered vehicles, pure electric vehicles, hybrid vehicles, or range-extended vehicles. The battery pack, controller, and motor can be installed inside the vehicle, with the controller controlling the battery's power supply to the motor. For example, the battery pack can be installed at the bottom, front, or rear of the vehicle.

[0018] The battery pack includes a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (shell, brackets, etc.), and protective components, etc., and the above components are placed in a box and sealed with a cover plate to form a complete functional unit that can directly output electrical energy.

[0019] A battery pack is formed by connecting multiple battery cells with similar capacity and internal resistance in series or parallel. It is understood that a battery cell can also be referred to as a battery.

[0020] A battery can store chemical energy and controllably convert it into electrical energy. In a recyclable battery, the active materials can be reactivated by charging after discharge, allowing it to continue to be used. A battery may specifically include a casing and battery cells housed within the casing; details are not provided here.

[0021] The enclosure refers to a closed or semi-closed structure made of materials such as metal and plastic. It is the physical carrier of the battery pack, and its design and manufacturing must meet the safety, reliability and functionality requirements of the battery pack in different usage scenarios.

[0022] The enclosure includes a lower enclosure, which includes a bottom plate and a side plate connected to and surrounding the bottom plate; and an upper enclosure, which is connected to the side plate and has a cover plate opposite to the bottom plate. The upper enclosure and the lower enclosure together enclose a receiving chamber.

[0023] Alternatively, the enclosure can be cast from materials such as steel plate or aluminum alloy, or made of lightweight materials such as glass fiber reinforced composite materials or carbon fiber reinforced composite materials. The shape of the enclosure can be cylindrical, cuboid, cube, etc.

[0024] The battery pack also includes a heat exchange assembly, which is connected to an external device that provides the heat exchange medium, so that the heat exchange medium can circulate in the heat exchange assembly, enabling the heat exchange assembly to heat the battery inside the casing and prevent thermal runaway.

[0025] The heat exchange assembly includes a heat exchange plate, which is used to exchange heat with the battery to regulate the battery temperature.

[0026] The heat exchange plate can be constructed as a liquid cooling plate or a phase change cooling plate and is thermally connected to the battery.

[0027] Optionally, the liquid cooling plate has liquid cooling channels, specifically, the shapes of which can be various, such as "U", "U-shaped", or "S-shaped. Optionally, the liquid cooling plate also includes an inlet and an outlet, both of which are connected to a collector for the inlet and outlet of the heat exchange medium. The liquid cooling plate can be made of a material with a certain hardness and strength (such as stainless steel). The material of the liquid cooling plate can be various, including but not limited to: copper, iron, aluminum, stainless steel, aluminum alloy, etc. The material of the liquid cooling plate can also be nylon, plastic, etc.

[0028] Specifically, the heat exchange assembly includes a plurality of heat exchange elements spaced apart along a first direction and disposed in a receiving chamber. One or more batteries are placed between two adjacent heat exchange elements, and the heat exchange elements are configured to provide heat exchange for the batteries. Each pair of adjacent heat exchange elements is connected by a heat exchange tube, which is configured to allow a heat exchange medium to flow between the plurality of heat exchange elements.

[0029] Typically, a robotic arm is used to grip heat exchanger tubes so that both ends of the tubes can be automatically inserted into two adjacent heat exchanger components. To achieve automated assembly, gripping sections for the robotic arm are provided on the heat exchanger tubes. However, during assembly, it has been found that the gripping force of the robotic arm affects the tube's position. If the gripping section is too short, the robotic arm needs to repeatedly position and clamp to accurately grip the heat exchanger tube; if the gripping section is too long, the robotic arm tends to clamp close to the end of the heat exchanger tube, causing deformation of the tube's opening and hindering the insertion of the heat exchanger tube into the heat exchanger component. Therefore, a reasonable structural design to improve installation efficiency and stability is crucial for heat exchanger assemblies.

[0030] Figure 1 This is a perspective view of a battery pack provided in an embodiment of this application. Figure 2 This is a schematic diagram of a heat exchange component and a battery in conjunction, provided as an embodiment of this application. Figure 3 This is a front view of a heat exchange component provided in an embodiment of this application. Figure 4 This is a top view of a heat exchange component provided in an embodiment of this application. Figure 5 This is a front view of a heat exchange tube in a heat exchange assembly provided in an embodiment of this application. Figure 6 This is a front view of a heat exchange tube in another heat exchange assembly provided in this application embodiment. Arrow X points to a first direction, which is also the row direction of the multiple battery arrangement; arrow Y points to a second direction, which is also the column direction of the multiple battery arrangement; and arrow Z points to a vertical direction. The first direction X, the second direction Y, and the vertical direction Z intersect each other. Furthermore, the first direction X, the second direction Y, and the vertical direction Z are mutually perpendicular, which will not be emphasized separately thereafter.

[0031] To address the aforementioned problems, this application provides a battery pack, such as... Figures 1 to 5 The battery pack 100 includes a heat exchange assembly 10 and a plurality of batteries 20 arranged at intervals. The heat exchange assembly 10 includes a plurality of heat exchange elements 1 and heat exchange tubes 2. The plurality of heat exchange elements 1 are arranged at intervals along a first direction X, which is parallel to the arrangement direction of the plurality of batteries 20. The batteries 20 are placed between adjacent heat exchange elements 1. The heat exchange elements 1 are configured to provide heat exchange for the batteries 20. The heat exchange tubes 2 connect two adjacent heat exchange elements 1 and are configured to allow the heat exchange medium to flow between the plurality of heat exchange elements 1.

[0032] Optionally, the heat exchange assembly 10 also includes heat exchange piping disposed on the base plate of the housing 30, which will not be described in detail.

[0033] Optionally, one or more batteries 20 may be provided between two adjacent heat exchangers 1. When multiple batteries 20 are provided between two adjacent heat exchangers 1, the multiple batteries 20 may be arranged in multiple rows along the first direction X and in multiple columns along the second direction Y. The arrangement can be adapted to actual needs without specific limitations.

[0034] It is understood that multiple batteries 20 disposed in the battery pack 100 can be electrically connected together in series, parallel, or mixed manner, and the multiple batteries 20 in the battery pack 100 can be arranged in multiple rows and columns to form a battery pack in the accommodating chamber. For ease of explanation and understanding, this embodiment of the application takes the arrangement of multiple batteries 20 in multiple rows and columns as an example. In this case, a heat exchanger 1 is provided between one or more batteries 20 adjacent in the row direction, and the arrangement direction of the multiple batteries 20 is parallel to the first direction, but it is not limited to this.

[0035] Optionally, such as Figure 3 and Figure 4 The heat exchange tube 2 can be disposed on one side or both sides of the battery pack in the second direction Y. In this embodiment, the heat exchange tube 2 is disposed on both sides of the battery pack in the second direction Y, with one side used to communicate with the inlet of the device that provides the heat exchange medium externally, and the other side used to communicate with the outlet of the device that provides the heat exchange medium externally, which will not be described in detail. For ease of understanding, the specific structure of the heat exchange tube 2 and its connection with the heat exchange component 1 will be described in detail below using the example of one side of the heat exchange tube 2.

[0036] Optionally, the heat exchange medium can be a cooling liquid or a cooling gas, which can be adapted to actual needs without specific limitations.

[0037] like Figure 3 and Figure 4 In two adjacent heat exchangers 1, one heat exchanger 1 may be provided with a first docking portion 1b, and the other heat exchanger 1 may be provided with a second docking portion 1c. The first docking portion 1b and the second docking portion 1c are arranged opposite to each other in the first direction X. The robot arm can clamp a clamping section of the heat exchange tube 2 near the first docking portion 1b so that one end of the heat exchange tube 2 is inserted into the first docking portion 1b. The robot arm can also clamp a clamping section of the heat exchange tube 2 near the second docking portion 1c so that the other end of the heat exchange tube 2 is inserted into the second docking portion 1c.

[0038] It is understandable that the first docking part 1b and the second docking part 1c can be configured as water nozzles that are connected to the heat exchange pipe 1a arranged in the heat exchange component 1, and the water nozzles can be inserted into one end of the corresponding heat exchange pipe 2.

[0039] The structure of heat exchange tube 2 will be described in detail below, taking the insertion of one of the docking parts into heat exchange tube 2 as an example.

[0040] like Figure 5 and Figure 6 The heat exchange tube 2 includes a body portion 21, an expansion portion 22, and a first rib 23. The body portion 21 extends along a first direction X. The expansion portion 22 is connected to at least one end of the body portion 21 in the first direction X. The inner diameter of the expansion portion 22 increases along the direction from the body portion 21 to the expansion portion 22. The expansion portion 22 has a first distance A mm between its two end faces in the first direction X. The first rib 23 is connected to a position near at least one end of the body portion 21. The first rib 23 is disposed on the outer periphery of the body portion 21. The side of the first rib 23 near the end face of the body portion 21 has a second distance B mm from the surface where the expansion portion 22 is connected to the body portion 21. 0.2 ≤ A / B ≤ 1.

[0041] The battery pack provided in this application embodiment uses a heat exchange tube 2 arranged as a body portion 21 and an expansion portion 22 along a first direction X. The body portion 21 is provided with a first rib 23, and the distance from the side of the first rib 23 near the end face of the body portion 21 to the surface where the expansion portion 22 connects to the body portion 21 is set as a second distance B mm (as a clamping section). The distance between the two end faces of the expansion portion 22 in the first direction X is set as a first distance A mm, where 0.2 ≤ A / B ≤ 1. If A / B is too large, the position of the robotic arm clamping the heat exchange tube 2 will be closer to the end face of the heat exchange tube 2, making the end face of the heat exchange tube 2 more prone to deformation, making it difficult to insert the mating part into the heat exchange tube 2, thus reducing installation efficiency. If A / B is too small, the robotic arm will have difficulty clamping the heat exchange tube 2, affecting installation efficiency. This application reasonably limits A / B, that is, it reasonably designs the position and length of the clamping section used for gripping by the robot arm and the size of the expansion part 22, so that the robot arm can quickly position and clamp the clamping section of the heat exchange tube 2 without squeezing the expansion part 22, eliminating the need for repeated clamping and positioning, and avoiding deformation of the expansion part 22, thereby improving the efficiency and stability of automated installation of the heat exchange tube 2.

[0042] Optionally, 3mm ≤ Amm ≤ 10mm, for example, the first distance Amm can be set to 3mm, 5mm, 7mm, 10mm, etc. 10mm ≤ Bmm ≤ 15mm, for example, the second distance Bmm can be set to 10mm, 12mm, 14mm, 15mm, etc.

[0043] Optionally, a third distance Cmm is provided between the surfaces where the expansion portions 22 on both sides of the first direction X connect with the main body portion 21, where 40mm≤Cmm≤255mm, such as 40mm, 10mm, 150mm, 255mm, etc., and 0.04≤B / C≤0.3. If B / C is too large, the first rib 23 is far away from the pipe opening at the end face of the heat exchange tube 2, which can increase the clamping space but reduces the strength of the pipe opening; if B / C is too small, the first rib 23 is close to the pipe opening at the end face of the heat exchange tube 2, which can improve the strength at the pipe opening but reduce the clamping space. The present application reasonably limits B / C, which can provide the robot with a suitable clamping space and ensure the strength at the pipe opening of the heat exchange tube 2.

[0044] Optionally, the first rib 23 has a first thickness Emm in the first direction X, where 0.17≤E / (B+E)≤0.27. For example, E / (B+E) can be set to 0.17, 0.2, 0.27, etc. The relationship between the first thickness Emm and the second distance Bmm of the first rib 23 is defined so that the first rib 23 has sufficient thickness for the robot's recognition and positioning while ensuring that the robot can quickly and stably clamp onto the clamping section of the heat exchange tube 2.

[0045] Optionally, 1mm≤Emm≤3mm, for example, the first thickness Emm can be set to 1mm, 2mm, 3mm, etc.

[0046] Optionally, the height of the first protruding rib 23 protruding from the outer wall of the main body 21 in the vertical direction Z is a first height H1mm, where 1.5mm ≤ H1mm ≤ 2.5mm. For example, the first height H1mm can be set to 1.5mm, 2mm, 2.5mm, etc. The reasonable height design of the first protruding rib 23 ensures that it can be used for positioning and recognition by a robotic arm while avoiding occupying too much space.

[0047] In some alternative embodiments, such as Figure 6 The expansion section 22 includes an outer expansion section 222 and an extension section 221. The outer expansion section 222 is located in the first direction X on the side of the extension section 221 close to the main body section 21. The outer tube wall of the extension section 221 extends along the first direction X and has a first outer diameter. The outer tube wall of the main body section 21 extends along the first direction X and has a second outer diameter. The first outer diameter is larger than the second outer diameter. Along the direction from the main body section 21 to the expansion section 22, the outer diameter of the outer tube wall of the outer expansion section 222 gradually increases and is inclined. The structure of the expansion section 22 facilitates the insertion between one end of the heat exchange tube 2 and the corresponding mating part.

[0048] Optionally, the extension section 221 has a first length d1mm in the first direction X, where 3mm ≤ d1mm ≤ 5mm, such as 3mm, 4mm, 4mm, etc., and the expansion section 222 has a second length d2mm in the first direction X, where 1mm ≤ d2mm ≤ 5mm, such as 1mm, 3mm, 5mm, etc., where 0.2 ≤ d2 / d1 ≤ 1. By limiting the proportional relationship between the first length d1mm and the second length d2mm, sufficient insertion length space can be provided for the expansion section 222 when inserted into the mating part, while ensuring that the extension section 221 has sufficient strength, thereby improving the sealing performance and stability of the connection between the heat exchange tube 2 and the mating part.

[0049] Optionally, 0.3≤d1 / A≤0.9. The proportion of the first length d1 to the first distance A of the expansion portion 22 (which can be called the total length of the expansion portion 22 in the first direction X) is limited to avoid the first length d1mm being too large, which would cause the second length d2mm to be too short, making it easy for the mating portion to loosen after insertion.

[0050] It is understandable that the tangential direction of the outer tube wall of the outward expansion section 222 along the direction from the body part 21 to the expansion part 22 has a first included angle a1° with the first direction X, such as 45°≤a1≤60°, 45°, 50°, 60°, etc.

[0051] Optionally, the outer wall of the extension section 221 and the outer wall of the main body 21 have a second height H2mm, where H2mm > H1mm. By limiting the relationship between the first height H1mm and the second height H2mm of the first rib 23, excessive space is avoided while making the expansion section 22 less prone to deformation when the robot handles the heat exchange tube 2, thus facilitating assembly.

[0052] Optionally, 2mm≤H2mm≤5mm, such as 2mm, 3mm, 5mm, etc.

[0053] Furthermore, the difference between the second height H2mm and the first height H1mm is between 0.5mm and 3.5mm, such as 0.5mm, 2mm, 3.5mm, etc. This is to ensure that the height can be used for positioning and recognition by robotic arms while avoiding excessive space occupation through reasonable height design.

[0054] Figure 7 This is a cross-sectional view of a heat exchange tube in a heat exchange assembly provided in an embodiment of this application.

[0055] In some alternative embodiments, such as Figure 7The inner wall of the expansion section 22 includes a first inclined tube wall 22a and a second inclined tube wall 22b connected together. The first inclined tube wall 22a is connected to the second inclined tube wall 22b and the inner wall of the main body section 21 at both ends of the first direction X. The tangent direction of the first inclined tube wall 22a has a second included angle a2 with the first direction X, and the tangent direction of the second inclined tube wall 22b has a third included angle a3° with the first direction X. a2° and a3° are different. Wherein, a3° > a2°. The second inclined tube wall 22b facilitates the smoother insertion of the first mating part 1b or the second mating part 1c, while the first inclined tube wall 22a enables the first mating part 1b or the second mating part 1c to have a higher sealing performance after insertion.

[0056] Optionally, the surfaces of the first inclined pipe wall 22a and the second inclined pipe wall 22b can be set as inclined planes or as inclined arc surfaces, without specific limitations.

[0057] Optionally, 22.5°≤a2°≤35°, such as 22.5°, 25°, 30°, 35°, etc., and 45°≤a3°≤60°, such as 45°, 50°, 55°, 60°, etc.

[0058] like Figure 7 The heat exchange tube 2 can be configured as a double-layer tube structure including an inner tube 2a and an outer tube 2b disposed on the outer periphery of the inner tube 2a. The outer tube 2b is made of a rigid material, and the inner tube 2a is made of a flexible material with deformability. When the mating part is inserted into one end of the heat exchange tube 2, the mating part can deform the inner tube 2a during the insertion process to ensure the sealing performance, insertion strength, and stability of the contact part between the mating part and the inner tube 2a, and to prevent detachment.

[0059] The following describes the specific structure of the heat exchange tube 2 in detail, based on the case where the heat exchange tube 2 consists of a double-layer tube including an inner tube 2a and an outer tube 2b disposed on the outer periphery of the inner tube 2a.

[0060] In some embodiments, the body portion 21 includes an inner tube section 211 and an outer tube section 212 disposed on the outer periphery of the inner tube section 211. A first rib 23 is disposed on the outer tube wall of the outer tube section 212. The expansion portion 22 includes an inner expansion tube section 223 and an outer expansion tube section 224 disposed on the outer periphery of the inner expansion tube section 223. The inner expansion tube section 223 is connected to at least one end of the inner tube section 211. Along the direction from the body portion 21 to the expansion portion 22, the inner diameter of the inner expansion tube section 223 increases. The outer expansion tube section 224 is disposed on the outer periphery of the inner expansion tube section 223 and is connected to at least one end of the outer tube section 212.

[0061] Optionally, the inner pipe section 211 and the inner expansion pipe section 223 are integrally formed, and / or the outer pipe section 212 and the outer expansion pipe section 224 are integrally formed.

[0062] Optionally, the inner pipe section 211 has a first thickness D1mm, and the wall thickness of at least some locations in the inner expansion pipe section 223 is greater than the first thickness D1mm, where 1mm≤D1mm≤2mm, such as 1mm, 1.5mm, 2mm, etc.

[0063] Optionally, the wall of the outer tube section 212 has a second thickness D2mm, where D1mm > D2mm, and 0.4mm ≤ D2mm ≤ 1mm, such as 0.4mm, 0.6mm, 0.8mm, 1mm, etc. The outer expansion tube section 224 includes connected extension subsection 2241 and outer expansion subsection 2242. The outer expansion subsection 2242 is located in the first direction X on the side of the extension subsection 2241 close to the outer tube section 212. The extension subsection 2241 extends along the first direction X, and the wall of the extension subsection 2241 has a third thickness D3mm, where D3mm > D2mm, to increase the strength of the end of the heat exchange tube 2 and reduce the risk of deformation.

[0064] Optionally, 0.5mm≤D3mm≤2mm, such as 0.5mm, 1.5mm, 2mm, etc.

[0065] In some alternative embodiments, such as Figure 5 The heat exchange assembly 10 also includes a second rib 24, which is connected to the outer periphery of the main body 21. The second rib 24 is located in the first direction X on the side of the first rib 23 away from the expansion portion 22. The distance between the first rib 23 and the second rib 24 is 4mm-160mm, such as 4mm, 50mm, 100mm, 160mm, etc. The second rib 24 increases the strength of the heat exchange tube 2 itself, thus preventing deformation when the heat exchange tube 2 is clamped.

[0066] Optionally, the number of second ribs 24 provided on the outer periphery of the body part 21 can be one or multiple ribs arranged at intervals. The number can be adjusted according to actual needs and is not specifically limited.

[0067] In some embodiments, such as Figures 1 to 3 Multiple batteries 20 are arranged along the first direction X and the second direction Y on the bottom plate of the housing 30, and at least one battery 20 is accommodated between every two adjacent heat exchange elements 1 in the heat exchange assembly 10.

[0068] It should be emphasized that the batteries 20 accommodated between each pair of adjacent heat exchangers 1 may include one or more arranged along the first direction X and / or along the second direction Y, which can be adapted to actual needs. In the embodiments of this application, at least two batteries 20 arranged along the first direction X are accommodated between each pair of adjacent heat exchangers 1.

[0069] In some embodiments, the battery 20 includes a first side disposed opposite to each other along a first direction X and a second side disposed opposite to each other along a second direction Y. The area of ​​the first side is larger than the area of ​​the second side. The heat exchanger 1 is configured to exchange heat with the first side, thereby achieving a better heat exchange effect on the battery 20 and preventing thermal runaway of the battery 20.

[0070] The battery 20 also includes a first surface and a second surface arranged opposite each other in the vertical direction Z. The first surface is provided with pole posts, and the second surface faces the bottom plate of the housing 30. The bottom plate may be provided with heat exchange pipes for cooling the second surface of the battery 20.

[0071] In some optional embodiments, the heat exchanger 1 includes a heat exchange plate 11 and an extension 12. The heat exchange plate 11 extends in the vertical direction Z, facing a first side surface. The extension 12 is connected to one side of the heat exchange plate 11 in the vertical direction Z and extends in the first direction X. The orthographic projection of the extension 12 in the vertical direction Z onto the first surface overlaps with the first surface. The extension 12 is configured to exchange heat with the first surface. This further improves the heat exchange effect on the battery 20 and reduces the risk of thermal runaway of the battery 20.

[0072] Optionally, along the vertical direction Z, the extension 12 may contact the first surface of the battery 20, or the extension 12 may not contact the first surface of the battery 20, that is, there is a gap between the extension 12 and the first surface, without specific limitation.

[0073] Furthermore, the heat exchange plate 11 and the extension 12 can be integrally formed, or they can be formed into a separate structure by welding, detachable connection, etc., without specific limitations. The heat exchange component 1 includes a heat exchange channel communicating with the first docking part 1b and the second docking part 1c. The heat exchange channel can be arranged in a serpentine manner on the heat exchange plate 11. Further, the heat exchange channel can extend to the extension 12 to improve the heat exchange effect of the extension 12 on the first surface of the battery 20, without specific limitations.

[0074] Optionally, the extension 12 may also extend to a position close to or corresponding to the pole post, so that the extension 12 is configured to also be able to exchange heat with the pole post, which will not be described in detail.

[0075] In some alternative embodiments, the heat exchange plate 11 may be provided with extensions 12 on both sides in the vertical direction Z. The extensions 12 on both sides are used to exchange heat on the first surface and the second surface of the battery 20, respectively, so as to further improve the heat exchange effect on the battery 20.

[0076] Optionally, the structure of the extension 12 for heat exchange on the second surface and its cooperation with the second surface can be referred to the relevant description of the extension 12 provided for heat exchange on the first surface, and will not be repeated here.

[0077] This application also provides an electrical device, the battery pack 100 of which can be referred to the relevant descriptions in the above embodiments, and will not be repeated here.

[0078] A battery pack can be installed in an electrical device to provide electrical energy to it. For example, the electrical device can be a mobile phone, portable device, laptop, electric vehicle, electric car, ship, spacecraft, electric toy, or power tool, etc., without specific limitations. For ease of explanation, this application embodiment applies the battery pack to a vehicle, i.e., the electrical device is set in a vehicle, including but not limited to gasoline-powered vehicles, pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles. The battery pack, controller, and motor can be installed inside the vehicle, with the controller controlling the battery's power supply to the motor. For example, the battery pack can be installed at the bottom, front, or rear of the vehicle.

[0079] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0080] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0081] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0082] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0083] It should be understood that the qualifiers “first,” “second,” “third,” “fourth,” “fifth,” and “sixth” used in the description of the embodiments of this application are only used to more clearly illustrate the technical solutions and are not intended to limit the scope of protection of this application.

[0084] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A battery pack, characterized in that, Includes a heat exchange assembly (10) and a plurality of spaced-apart batteries (20), the heat exchange assembly (10) comprising: Multiple heat exchange elements (1) are spaced apart along a first direction (X), which is parallel to the arrangement direction of the multiple batteries (20). The batteries (20) are placed between adjacent heat exchange elements (1), and the heat exchange elements (1) are configured to exchange heat with the batteries (20). A heat exchange tube (2) is connected to two adjacent heat exchange elements (1), and the heat exchange tube (2) is configured to allow the heat exchange medium to flow between the plurality of heat exchange elements (1); The heat exchange tube (2) includes: The main body (21) extends along the first direction (X); An expansion portion (22) is connected to at least one end of the body portion (21) in the first direction (X), and the expansion portion (22) is located along the direction from the body portion (21) to the expansion portion (22). The inner diameter of the expansion portion (22) increases, and the expansion portion (22) has a first distance Amm between its two end faces in the first direction (X). A first rib (23) is connected to at least one end of the body part (21). The first rib (23) is disposed on the outer periphery of the body part (21). The side of the first rib (23) near the end face of the body part (21) has a second distance Bmm to the surface where the expansion part (22) is connected to the body part (21), where 0.2≤A / B≤1.

2. The battery pack according to claim 1, characterized in that, There is a third distance C mm between the surfaces where the expansion portion (22) and the main body portion (21) are connected in the first direction (X), where 0.04≤B / C≤0.

3.

3. The battery pack according to claim 2, characterized in that, 3mm≤Amm≤10mm, and / or, 10mm≤Bmm≤15mm, and / or, 40mm≤Cmm≤255mm.

4. The battery pack according to claim 1, characterized in that, The first rib (23) has a first thickness E mm in the first direction (X), where 0.17 ≤ E / (B+E) ≤ 0.

27.

5. The battery pack according to claim 4, characterized in that, 1mm≤Emm≤3mm.

6. The battery pack according to claim 1, characterized in that, The expansion portion (22) includes an outward expansion section (222) and an extension section (221), wherein the outward expansion section (222) is located in the first direction (X) on the side of the extension section (221) closer to the main body portion (21). The outer wall of the extension section (221) extends along the first direction (X) and has a first outer diameter. The outer wall of the body part (21) extends along the first direction (X) and has a second outer diameter. The first outer diameter is larger than the second outer diameter. Along the direction from the body part (21) to the expansion part (22), the outer diameter of the outer wall of the expansion section (222) gradually increases and is inclined.

7. The battery pack according to claim 6, characterized in that, The extension segment (221) has a first length d1mm in the first direction (X), and the outward expansion segment (222) has a second length d2mm in the first direction (X), 0.2≤d2 / d1≤1, and / or, 0.3≤d1 / A≤0.

9.

8. The battery pack according to claim 7, characterized in that, 3mm≤d1mm≤5mm, and / or, 1mm≤d2mm≤5mm.

9. The battery pack according to claim 6, characterized in that, The outer tube wall of the outer expansion section (222) in the direction from the main body (21) to the expansion section (22) has a first included angle a1° with the first direction (X), where 45°≤a1≤60°.

10. The battery pack according to claim 1, characterized in that, The inner wall of the expansion section (22) includes a first inclined wall (22a) and a second inclined wall (22b) connected together. The first inclined wall (22a) is connected to the second inclined wall (22b) and the inner wall of the body section (21) at both ends of the first direction (X). There is a second included angle a2° between the tangent direction of the first inclined wall (22a) pointing from the body section (21) to the expansion section (22) and the first direction (X). There is a third included angle a3° between the tangent direction of the second inclined wall (22b) pointing from the body section (21) to the expansion section (22) and the first direction (X). a2° and a3° are different.

11. The battery pack according to claim 10, characterized in that, a3°>a2°, and / or, 22.5°≤a2°≤35°, and / or, 45°≤a3°≤60°.

12. The battery pack according to claim 6, characterized in that, The first rib (23) protrudes from the outer tube wall of the main body (21) in the vertical direction (Z) by a height of H1mm, the vertical direction (Z) being perpendicular to the first direction (X), and the outer tube wall of the extension section (221) having a second height H2mm between it and the outer tube wall of the main body (21), where H2mm > H1mm.

13. The battery pack according to claim 12, characterized in that, 1.5mm≤H1mm≤2.5mm, and / or, 2mm≤H2mm≤5mm, and / or, the difference between the second height H2mm and the first height H1mm is between 0.5mm and 3.5mm.

14. The battery pack according to claim 1, characterized in that, The main body (21) includes an inner tube section (211) and an outer tube section (212) disposed on the outer periphery of the inner tube section (211). The first rib (23) is disposed on the outer wall of the outer tube section (212). The expansion portion (22) includes: An inner expansion tube section (223) is connected to at least one end of the inner tube section (211), and the inner diameter of the inner expansion tube section (223) increases along the direction from the body part (21) to the expansion part (22). An outer expansion pipe section (224) is disposed on the outer periphery of the inner expansion pipe section (223), and the outer expansion pipe section (224) is connected to at least one end of the outer pipe section (212).

15. The battery pack according to claim 14, characterized in that, The inner pipe section (211) is integrally formed with the inner expansion pipe section (223), and / or the outer pipe section (212) is integrally formed with the outer expansion pipe section (224).

16. The battery pack according to claim 14, characterized in that, The inner pipe section (211) has a first thickness D1mm in its wall, and the wall thickness of at least some locations in the inner expansion pipe section (223) is greater than the first thickness D1mm.

17. The battery pack according to claim 16, characterized in that, 1mm≤D1mm≤2mm.

18. The battery pack according to claim 14, characterized in that, The outer pipe section (212) has a second wall thickness D2mm. The outer expansion pipe section (224) includes a connected extension subsection (2241) and an expansion subsection (2242). The expansion subsection (2242) is located on the side of the extension subsection (2241) close to the outer pipe section (212) in the first direction (X). The extension subsection (2241) extends along the first direction (X), and the wall of the extension subsection (2241) has a third wall thickness D3mm, where D3mm > D2mm.

19. The battery pack according to claim 18, characterized in that, 0.4mm≤D2mm≤1mm, and / or, 0.5mm≤D3mm≤2mm.

20. The battery pack according to any one of claims 1-19, characterized in that, Also includes: The second rib (24) is connected to the outer periphery of the body part (21). The second rib (24) is located on the side of the first rib (23) away from the expansion part (22) in the first direction (X). The distance between the first rib (23) and the second rib (24) is between 4mm and 160mm.

21. The battery pack according to any one of claims 1-19, characterized in that, The battery (20) includes two first sides and two second sides. The two first sides are disposed on both sides of the battery (20) along the first direction (X), and the two second sides are disposed on both sides of the battery (20) along the second direction (Y). The first direction (X) and the second direction (Y) intersect, and the area of ​​the first side is larger than the area of ​​the second side. The heat exchanger (1) is configured to exchange heat with the first sides.

22. The battery pack according to claim 21, characterized in that, The battery (20) includes a first surface with electrode posts. The first surface is disposed on one side of the battery (20) in the vertical direction (Z). The heat exchanger (1) includes a heat exchange plate (11) and an extension (12). The heat exchange plate (11) faces the first side. The extension (12) is connected to one side of the heat exchange plate (11) in the vertical direction (Z). The extension (12) is configured to exchange heat with the first surface.

23. An electrical appliance, characterized in that, Includes the battery pack (100) as described in any one of claims 1-22.

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