Battery pack and powered device

Abstract

The present disclosure provides a battery pack and an electric device, and relates to the field of batteries. The battery pack comprises a box, a plurality of batteries, a plurality of heat exchange plates and a mixing flow component. The box is provided with an inner space. The plurality of batteries are arranged in the inner space. The plurality of heat exchange plates are arranged on the first side of the plurality of batteries in the first direction, are arranged at intervals in the second direction perpendicular to the first direction, and comprise two first heat exchange plates located at the outermost sides in the second direction and a plurality of second heat exchange plates located between the two first heat exchange plates. The mixing flow component is provided with a mixing flow cavity in fluid communication with the plurality of heat exchange plates, and the mixing flow cavity is used for mixing the fluids from the two first heat exchange plates and making the mixed fluids flow into the plurality of second heat exchange plates. The fluids with possible temperature difference of the two first heat exchange plates are mixed through the mixing flow cavity, and then the fluids with uniform temperature flow into the second heat exchange plates. This can effectively balance the temperature of the entire heat exchange plate.

Description

Technical Field

[0001] This disclosure relates to the field of batteries, and in particular, to a battery pack and an electrical device having the battery pack. Background Technology

[0002] It is known that a battery pack comprises multiple batteries and a heat exchange plate for cooling the batteries. The battery pack can form a closed loop by connecting an external cooling chamber to the heat exchange plate via a circulation pipe. Specifically, coolant enters the heat exchange plate from the cooling chamber through the inlet port, flows through the entire heat exchange area covering the battery surface, completes heat exchange, and then flows back to the cooling chamber through the outlet port for further cooling. This allows the heat exchange plate to rapidly cool the intense heat generated during high-rate fast charging or high-power discharging of the batteries.

[0003] However, because the heat exchange plates serve different heat exchange areas, the temperature and flow rate of the coolant are different, which leads to uneven distribution of the coolant within the heat exchange plates. Utility Model Content

[0004] In view of this, the present disclosure provides a battery pack designed to solve the problem of uneven distribution of coolant within the heat exchange plate.

[0005] The battery pack includes a housing, multiple batteries, multiple heat exchange plates, and a mixing element. The housing has an internal space. The multiple batteries are housed within the internal space. The multiple heat exchange plates are located on a first side of the multiple batteries in a first direction, and are arranged at intervals along a second direction perpendicular to the first direction. The heat exchange plates include two outermost first heat exchange plates in the second direction and multiple second heat exchange plates located between them. The mixing element has a mixing chamber in fluid communication with the multiple heat exchange plates. The mixing chamber is used to mix fluids from two of the first heat exchange plates, and to allow the mixed fluid to flow into the multiple second heat exchange plates.

[0006] According to the above structure, coolant can flow from the outside into the first heat exchange plates located on both sides, converge in the mixing chamber, and then flow uniformly into the second heat exchange plate, thereby achieving comprehensive cooling of multiple batteries. The two outermost first heat exchange plates, being directly exposed to the side wall of the housing, have better heat dissipation efficiency than the second heat exchange plate located in the middle, and can preferentially receive low-temperature coolant from the outside. Simultaneously, the coolant temperature may differ between the two first heat exchange plates as it flows over the battery surface. The mixing chamber mixes the fluids from the two first heat exchange plates that may have temperature differences, forming a uniformly heated medium before flowing into the second heat exchange plate. This allows for efficient cooling of the batteries located inside the battery pack, in the central area where the heat exchange temperature is typically higher, and also ensures uniform flow of coolant within the heat exchange plates, effectively balancing the temperature of the entire heat exchange plate.

[0007] This disclosure also includes electrical equipment, including the aforementioned battery pack. Attached Figure Description

[0008] It should be understood that the following figures only illustrate certain embodiments of this disclosure and should not be construed as limiting the scope.

[0009] It should be understood that the same or similar reference numerals are used in the accompanying drawings to denote the same or similar elements.

[0010] It should be understood that the accompanying drawings are only schematic, and the dimensions and scales of the elements in the drawings are not necessarily precise.

[0011] Figure 1 This is a schematic diagram of the structure of a battery pack according to an embodiment of the present disclosure.

[0012] Figure 2 for Figure 1 A schematic diagram of the structure of the battery pack.

[0013] Figure 3 for Figure 2 A schematic enlarged view of part A.

[0014] Figure 4 for Figure 2 A schematic enlarged view of part A according to another embodiment of the present disclosure.

[0015] Figure 5 for Figure 2 A schematic enlarged view of part A according to another embodiment of the present disclosure.

[0016] Figure 6 for Figure 1 A schematic enlarged view of part B.

[0017] Figure 7 for Figure 1 A schematic enlarged view of section C.

[0018] Figure 8 This is a partial cross-sectional view of an electrical appliance according to an embodiment of the present disclosure.

[0019] Figure captions: 100—Battery pack; 10—Casing; 20—Battery; 21—Side of battery; 211—Explosion-proof valve; 212—Side portion; 22—Terminal post; 23—Outer edge of battery; 30—Heat exchange plate; 31—First heat exchange plate; 311—Outer edge of first heat exchange plate; 32—Second heat exchange plate; 321—Port section; 322—Distribution chamber; 323—Flow channel; 40—Mixing component; 41—Mixing chamber; 50—Port component; 51—Return chamber; 511—Return port; 52—Inlet chamber; 521—Inlet port; 522—Bypass inlet port; 53—Isolator; 200—Electrical equipment, automobile. Detailed Implementation

[0020] Numerous specific details are set forth below to provide an understanding of the structure, function, and use of the embodiments described and illustrated in the specification and figures. It is to be understood that the embodiments described and illustrated herein are non-limiting examples, and thus it will be appreciated that the particular structural and functional details disclosed herein are representative and exemplary. Variations and changes may be made to these embodiments without departing from the scope of the claims.

[0021] <Example Battery Pack> This disclosure provides a battery pack according to one embodiment. (See reference...) Figure 1 and Figure 2 The battery pack 100 includes a housing 10 and multiple batteries 20. The multiple batteries 20 are electrically connected to each other to form a battery pack. The housing 10 houses the batteries 20 and a battery management system. The batteries 20 are electrically connected to the battery management system to enable the charging and discharging of the multiple batteries 20. The housing 10 serves as an external protective structure, typically made of metal or composite materials, and is waterproof, dustproof, and impact-resistant, providing a safe operating environment for the internal components such as the batteries 20 and the battery management system.

[0022] The battery pack 100 may also include a battery group composed of multiple batteries 20 connected in series and parallel, and integrate a battery management system (BMS), a thermal management system, an electrical connection system (high-voltage / low-voltage connectors, wiring harnesses, etc.), structural components (casing, brackets, etc.), and protective components. These components are housed within the enclosure 10 and sealed by the top cover, forming a complete functional unit capable of directly outputting electrical energy. The battery pack 100 can serve as a rechargeable battery pack, acting as a power source for new energy vehicles, primarily for storing and providing electrical energy.

[0023] Continue to refer to Figure 1 and Figure 2 The battery pack 100 also includes a plurality of heat exchange plates 30 and a mixing element 40. The housing 10 has an internal space. A plurality of batteries 20 are disposed within the internal space. The plurality of heat exchange plates 30 are disposed on a first side of the plurality of batteries 20 in a first direction, and are arranged at intervals along a second direction perpendicular to the first direction, including two outermost first heat exchange plates 31 in the second direction and a plurality of second heat exchange plates 32 located between them. The mixing element 40 has a mixing chamber 41 in fluid communication with the plurality of heat exchange plates 30, the mixing chamber 41 being used to mix fluids from the two first heat exchange plates 31, and causing the mixed fluid to flow into the plurality of second heat exchange plates 32.

[0024] Based on the above construction, refer to Figure 1 and Figure 7Coolant can flow from the outside into the first heat exchange plates 31 located on both sides, and after converging in the mixing chamber 41, it flows into the second heat exchange plates 32. Specifically, external coolant flows into the two first heat exchange plates 31 through the inlet port 521. The coolant that has completed the initial heat exchange flows into the mixing chamber 41 along the Z- direction for temperature equalization. The mixed coolant then flows into multiple second heat exchange plates 32 along the Z+ direction for heat exchange. Finally, the coolant that has absorbed heat gathers in the return chamber 51 and flows out through the return port 511, thereby achieving comprehensive cooling of multiple batteries 20. The two outermost first heat exchange plates 31, because they are directly exposed to the side wall of the housing 10, i.e., the housing in the Y+-Y- direction of the battery pack, have better heat dissipation efficiency than the second heat exchange plates 32 located in the middle, and can preferentially receive low-temperature coolant from the outside. At the same time, the coolant temperature of the two first heat exchange plates 31 may also differ when flowing over the surface of the battery 20. The fluids that may have temperature differences between the two first heat exchange plates 31 are mixed through the mixing chamber 41 to form a medium with a uniform temperature before flowing into the second heat exchange plate 32. This can efficiently cool the battery 20 located in the central area inside the battery pack 100 where the heat exchange temperature is usually higher, and can also make the coolant flow evenly within the heat exchange plate 30, effectively balancing the temperature of the entire heat exchange plate 30.

[0025] For ease of description, in the accompanying drawings of this disclosure, arrows X+ and X- respectively indicate opposite sides in a first direction, arrows Y+ and Y- respectively indicate opposite sides in a second direction, and arrows Z+ and Z- respectively indicate opposite sides in a third direction.

[0026] refer to Figure 2The minimum distance between the two first heat exchange plates 31 in the second direction is D1, in mm, and the maximum distance between the multiple second heat exchange plates 32 in the second direction is D2, in mm, where 0.48 ≤ D2 / D1 ≤ 0.87. Preferably, 0.5 ≤ D2 / D1 ≤ 0.85. More preferably, 0.55 ≤ D2 / D1 ≤ 0.8. Alternatively, the ratio D2 / D1 can also be 0.6, 0.65, 0.7, or 0.75, etc. If D2 / D1 is too small, i.e., D2 / D1 is less than 0.48, the width covered by the second heat exchange plates 32 is too narrow relative to the width formed by the first heat exchange plates 31 on both sides. The cooling coverage of the second heat exchange plates 32 cannot effectively remove the heat generated in the middle area of ​​the battery 20, which can easily lead to excessively high temperature in the middle area of ​​the battery 20, resulting in a decrease in the overall temperature balance of the battery pack 100. If D2 / D1 is too large, i.e., D2 / D1 is greater than 0.87, the width covered by the second heat exchange plate 32 is too wide relative to the width formed by the first heat exchange plates 31 on both sides. The amount of fluid flowing into the mixing chamber 41 through the first heat exchange plate 31 is insufficient, or the initial temperature of the mixed coolant is too high, which weakens the cooling efficiency of the second heat exchange plate 32. According to the above ratio range, it is ensured that the second heat exchange plate 32 has a sufficient width to cool the area with the largest heat generation inside the battery pack 100, while the first heat exchange plate 31 with the necessary width is reserved to provide low-temperature coolant to achieve temperature balance.

[0027] Further, 400mm ≤ D1 ≤ 526mm, preferably 420mm ≤ D1 ≤ 520mm. More preferably, 430mm ≤ D1 ≤ 510mm. Alternatively, the value of D1 can also be 450mm, 470mm, 490mm, or 500mm, etc. 250mm ≤ D2 ≤ 350mm. Preferably, 260mm ≤ D2 ≤ 340mm. More preferably, 270mm ≤ D2 ≤ 330mm. Alternatively, the value of D2 can also be 280mm, 290mm, 300mm, 310mm, or 320mm, etc.

[0028] Continue to refer to Figure 2The minimum distance from one first heat exchange plate 31 to multiple second heat exchange plates 32 is D3 (in mm), and the minimum distance from another first heat exchange plate 31 to multiple second heat exchange plates 32 is D4 (in mm), where 0.8 ≤ D3 / D4 ≤ 1.2. If D3 / D4 is too small (less than 0.8) or too large (greater than 1.2), the flow path length from the coolant on the two sides of the first heat exchange plates 31 to the mixing chamber 41 will be different. The flow resistance will vary due to the difference in flow path length; the side with shorter distances will have lower flow resistance, and the side with longer distances will have higher flow resistance. The coolant will preferentially flow to the shorter path with lower flow resistance, resulting in excessive flow on that side, while the longer path with higher flow resistance will have insufficient flow. This will lead to excessive differences in the temperature and flow rate of the coolant flowing from the two sides of the first heat exchange plates 31 to the mixing chamber, making it impossible for the mixed fluid to achieve heat exchange equilibrium. Based on the ratio range of 0.8≤D3 / D4≤1.2, ensure that the flow path length and flow resistance from the first heat exchange plate 31 on both sides to the mixing chamber 41 are basically symmetrical, so as to avoid uneven distribution of coolant before it flows into the second heat exchange plate 32.

[0029] Further, 25mm ≤ D3 ≤ 137mm, preferably 40mm ≤ D3 ≤ 120mm. More preferably, 50mm ≤ D3 ≤ 100mm. Alternatively, the value of D3 can also be 60mm, 70mm, 80mm, or 90mm, etc. 25mm ≤ D4 ≤ 137mm, preferably 40mm ≤ D4 ≤ 120mm. More preferably, 50mm ≤ D4 ≤ 100mm. Alternatively, the value of D4 can also be 60mm, 70mm, 80mm, or 90mm, etc.

[0030] refer to Figure 1 and Figure 3 The system comprises multiple batteries 20, including multiple rows of batteries 20, each row of batteries 20 stacked along a third direction perpendicular to both the first and second directions. The multiple rows of batteries 20 are arranged along the second direction. Each battery 20 has an explosion-proof valve 211 on its first side, i.e., the explosion-proof valve is located on the X+ side in the figure. Two adjacent heat exchange plates 30 cover two side portions 212 of each battery 20 in the same row of batteries 20, with the explosion-proof valve 211 located between the two side portions 212. According to the above configuration, the heat exchange plates 30 only cover the side portions 212 of each battery 20, which provides direct pressure relief space for the explosion-proof valve 211. When the battery 20 experiences thermal runaway, high-pressure, high-temperature gas and ejected material can be smoothly ejected upwards from the explosion-proof valve 211 without being directly blocked by the heat exchange plates 30 above. This ensures that the explosion-proof valve 211 can effectively operate in the event of thermal runaway of the battery 20, avoiding structural damage or escalation of risks that may result from insufficient pressure relief.

[0031] Continue to refer to Figure 3The minimum distance from the explosion-proof valve 211 to the two heat exchange plates 30 is D5 (in mm), and the dimension of the battery 20 in the second direction is W1 (in mm). 0.0003 ≤ D5 / W1 ≤ 0.42. Preferably, 0.05 ≤ D5 / W1 ≤ 0.4. More preferably, 0.1 ≤ D5 / W1 ≤ 0.35. Alternatively, the ratio D5 / W1 can also be 0.15, 0.2, 0.25, or 0.3. If D5 / W1 is too small, i.e., less than 0.0003, the ejection outlet of the explosion-proof valve 211 is too narrow relative to the battery 20. When the battery 20 experiences thermal runaway, the high-speed ejected hot gas flow and solid particles can easily directly impact or splash onto the heat exchange plates 30, possibly being partially blocked or reflected back, hindering pressure relief. If D5 / W1 is too large, i.e., D5 / W1 is greater than 0.42, the area of ​​the heat exchange plate 30 above the explosion-proof valve 211 will be too narrow, causing the battery 20 to be unable to be effectively cooled by the heat exchange plate 30, which may induce thermal runaway due to local overheating. According to the above ratio range, a smooth pressure relief space is provided for the opening of the explosion-proof valve 211 and the ejection of high-temperature substances, and it is ensured that the heat exchange plate 30 can cover the effective area of ​​the top surface of the battery 20 to the maximum extent.

[0032] Further, 0.2mm ≤ D5 ≤ 62.5mm, preferably 5mm ≤ D5 ≤ 60mm. More preferably, 10mm ≤ D5 ≤ 50mm. Alternatively, the value of D5 can also be 20mm, 30mm, 40mm, or 45mm, etc. 148mm ≤ W1 ≤ 685mm, preferably 200mm ≤ W1 ≤ 650mm. More preferably, 250mm ≤ W1 ≤ 550mm. Alternatively, the value of W1 can also be 300mm, 350mm, 450mm, 500mm, or 550mm, etc.

[0033] refer to Figure 3 The battery 20 also has two terminals 22, which are respectively located on two side portions 212. It can be understood that, in the attached... Figure 3 In the diagram, the dashed rectangles represent the terminals 22. To maintain clarity, they are not individually labeled. Terminals 22 are crucial for current output and also represent areas of high heat within the battery 20. Based on the aforementioned structure, the heat exchange plate 30 can directly cover the terminals 22. This allows the heat generated by the terminals 22 to be efficiently carried away by the coolant within the heat exchange plate 30, effectively preventing the terminals 22 from becoming localized hotspots, reducing the maximum operating temperature of the battery 20, and preventing uneven heat exchange in the second direction caused by the heating of the terminals 22.

[0034] refer to Figure 2 and Figure 3In the second direction, the two adjacent side portions 212 of two adjacent batteries 20 can both be covered by the same second heat exchange plate 32. That is, one second heat exchange plate 32 can simultaneously cover the terminal post 22 portions of two adjacent batteries 20 in the second direction, ensuring uniform cooling conditions for adjacent batteries 20. This effectively controls minute temperature differences between adjacent batteries 20, preventing the formation and expansion of localized hot spots caused by thermal runaway of a single battery 20, and improving the temperature uniformity inside the battery pack 100. Simultaneously, it reduces the manufacturing cost and assembly complexity of the second heat exchange plate 32.

[0035] refer to Figure 4 Each second heat exchange plate 32 can cover only one side portion 212 of each battery 20 in a row of batteries 20. That is, each row of terminals 22 of each row of batteries 20 stacked upwards along the third direction corresponds to a second heat exchange plate 32, which provides independent cooling for each row of batteries 20. In the event of a leak or blockage in a single second heat exchange plate 32, the impact can be limited to the row of terminals 22 corresponding to that second heat exchange plate 32, without affecting the heat exchange of the entire row of batteries 20, or even the entire battery pack 100.

[0036] Back Figures 1 to 3 The plurality of second heat exchange plates 32 are two separate second heat exchange plates 32. There are three rows of batteries 20 along the second direction, wherein two first heat exchange plates 31 are respectively arranged on the two outermost side portions 212, and two second heat exchange plates 32 are arranged between the two first heat exchange plates 31. This ensures that the fluid collected from the first heat exchange plates 31 into the mixing chamber can flow more evenly into the second heat exchange plates 32.

[0037] refer to Figure 5 Each second heat exchange plate 32 has a port 321 that connects to the mixing element 40, which gradually slopes inward toward the other end of the second heat exchange plate 32. According to this configuration, the mixing element 40 can effectively guide the coolant fluid from the first heat exchange plates 31 on both sides, even if there is a temperature difference. When the fluid enters the mixing chamber 41, the inclined port 321 causes the fluid to converge and swirl, which enhances the turbulent mixing of the fluid. This ensures that coolant at different temperatures can achieve sufficient and rapid heat exchange and temperature equalization within the mixing chamber 41 before entering the second heat exchange plate 32, avoiding a decrease in cooling effect due to uneven mixing. It also provides the second heat exchange plate 32 with a uniformly heated cooling fluid.

[0038] Back Figure 3The distance from the outer edge 311 of each first heat exchange plate 31 along the second direction to the outer edge 23 of the entire plurality of batteries 20 is D6, in mm. The dimension of each battery 20 in the second direction is W1, in mm, and 0.0002 ≤ D6 / W1 ≤ 0.41. Preferably, 0.05 ≤ D6 / W1 ≤ 0.4. More preferably, 0.1 ≤ D6 / W1 ≤ 0.35. Alternatively, the ratio D6 / W1 can also be 0.15, 0.2, 0.25, or 0.3, etc. If D6 / W1 is too small, i.e., D6 / W1 is less than 0.0002, the outer edge 311 of the first heat exchange plate 31 is too close to the outer edge 311 of the battery 20, increasing the risk of physical interference between the first heat exchange plate 31 and the side wall or inner edge of the housing 10, which may cause assembly difficulties. If D6 / W1 is too large, i.e., D6 / W1 is greater than 0.41, the outer edge 311 of the first heat exchange plate 31 is too far from the outer edge 23 of the battery 20. The first heat exchange plate 31 cannot fully utilize its available coverage area to cool the outermost row of batteries 20. This may lead to a crowded layout of the middle second heat exchange plate 32, wasted space on both sides, and reduced space utilization of the battery pack 100. According to the above ratio range, it is ensured that the first heat exchange plate 31 can cover the available cooling surface of the outermost battery 20 to the maximum extent, while avoiding structural interference with the edge of the housing 10.

[0039] Further, 0.1mm ≤ D6 ≤ 62mm, preferably 5mm ≤ D6 ≤ 55mm. More preferably, 10mm ≤ D6 ≤ 50mm. Alternatively, the value of D6 can also be 15mm, 25mm, 35mm, or 45mm, etc. 148mm ≤ W1 ≤ 685mm, preferably 155mm ≤ W1 ≤ 600mm. More preferably, 200mm ≤ W1 ≤ 500mm. Alternatively, the value of W1 can also be 250mm, 350mm, 400mm, or 450mm, etc.

[0040] refer to Figure 6 Each second heat exchange plate 32 has a distribution chamber 322 and multiple flow channels 323 inside. The multiple flow channels 323 are connected to the mixing chamber 41 through the distribution chamber 322. The fluid from the mixing chamber 41 is distributed to the multiple flow channels 323 through the distribution chamber 322. The homogenized fluid from the mixing chamber 41 first enters the distribution chamber 322, which has a relatively large cross-section, which can effectively buffer the fluid kinetic energy and equalize the pressure. The fluid is then introduced in parallel into the multiple subdivided flow channels 323. This ensures that each flow channel 323 receives a cooling medium with a similar flow rate and velocity, so that the battery 20 area covered by the second heat exchange plate 32 can be cooled uniformly and consistently, effectively eliminating the temperature difference inside the battery pack 100 caused by uneven flow distribution.

[0041] refer to Figure 1 and Figure 7The battery pack 100 also includes a port component 50. A mixing component 40 is located at one end of the plurality of heat exchange plates 30 in a third-direction direction, and the port component 50 is located at the other end of the plurality of heat exchange plates 30 in the third-direction direction. The port component 50 has at least one return port 511 for outflow. The third-direction direction is perpendicular to both the first and second directions. The coolant that has completed heat exchange in the second heat exchange plate 32 flows out through the flow channel 323 and is guided to the return cavity 51 within the port component 50. This eliminates the complexity of setting up separate external return pipelines for each second heat exchange plate 32, simplifies the external piping layout of the battery pack 100, and reduces the risk of leakage. Simultaneously, the return cavity 51 helps balance the back pressure at the outlets of each flow channel 323, further ensuring the uniformity of coolant flow distribution within the second heat exchange plate 32.

[0042] refer to Figure 1 and Figure 7 The port component 50 also includes two inlet chambers 52, which are separated from the return chamber 51 by two isolation members 53. Fluid flows into the inlet chambers 52 through the two inlet ports 521 and then into the two first heat exchange plates 31. In other words, coolant from the outside enters the two non-communicating inlet chambers 52 through the inlet ports 521 on both sides, and the coolant is guided to the corresponding two first heat exchange plates 31. The isolation members 53 ensure that there is no fluid communication between the inlet chambers 52 and the return chambers 51 where the heat-exchanged coolant is collected, preventing the mixing of hot and cold fluids and avoiding heat exchange efficiency loss due to mixing.

[0043] refer to Figure 1 and Figure 6 The mixing chamber 41 is fluidly connected via a bypass inlet port 522. The bypass inlet port 522 serves as a third independent fluid interface, allowing additional coolant to be directly injected into the mixing chamber 41. In one embodiment, during battery pack 100 startup or in low-temperature environments, a higher-temperature coolant can be introduced to quickly and uniformly preheat the battery 20 in the central region. In another embodiment, under extremely high heat loads, a lower-temperature coolant can be injected to enhance cooling of the mixture about to enter the second heat exchange plate 32. This enhances the temperature regulation capability of the mixed coolant, thereby improving the adaptability and control accuracy of the battery pack 100 under different operating conditions.

[0044] <Example Electrical Equipment> This utility model embodiment also provides an electrical device 200, which may include the battery pack 100 described above.

[0045] By way of example only, electrical equipment 200 can be, but is not limited to, vehicles, ships, aircraft, household appliances, and industrial equipment. For example, vehicles can be passenger cars, trucks, construction vehicles, etc.

[0046] In addition, the electrical equipment 200 can also be used for the storage, conversion and release of recyclable electrical energy.

[0047] In a non-restrictive example, refer to Figure 8 The electrical equipment 200 can be the car 200, and the battery pack 100 can be used as a power source to provide power to the car 200.

[0048] It should be noted that the elements described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0049] It should be understood that multiple components and / or parts can be provided by a single integrated component or part. Alternatively, a single integrated component or part can be divided into multiple separate components and / or parts. The use of the public designation "a" or "an" to describe a component or part does not imply the exclusion of other components or parts.

[0050] It should be understood that although terms such as “first” or “second” may be used in this disclosure to describe various elements (such as the first heat exchange plate and the second heat exchange plate), these elements are not defined by these terms, which are only used to distinguish one element from another.

[0051] The basic principles of this disclosure have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this disclosure are merely examples and not limitations, and should not be considered as essential features of each embodiment of this disclosure. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the scope of this disclosure to the necessity of employing the aforementioned specific details for implementation.

[0052] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery pack, characterized in that, include: The box body has internal space; Multiple batteries are disposed within the space inside the box; Multiple heat exchange plates are disposed on a first side of the multiple batteries in a first direction and arranged at intervals from each other in a second direction perpendicular to the first direction, and include two first heat exchange plates located on the outermost side in the second direction and multiple second heat exchange plates located between them; as well as The mixing element is provided with a mixing chamber in fluid communication with the plurality of heat exchange plates. The mixing chamber is used to mix the fluids from the two first heat exchange plates and allow the mixed fluids to flow into the plurality of second heat exchange plates.

2. The battery pack according to claim 1, characterized in that, The minimum distance between the two first heat exchange plates in the second direction is D1, in mm, and the maximum distance between the plurality of second heat exchange plates in the second direction is D2, in mm, where 0.48 ≤ D2 / D1 ≤ 0.

87.

3. The battery pack according to claim 2, characterized in that, 400mm≤D1≤526mm, and / or, 250mm≤D2≤350mm.

4. The battery pack according to claim 2 or 3, characterized in that, The minimum distance from one first heat exchange plate to the plurality of second heat exchange plates is D3, in mm, and the minimum distance from another first heat exchange plate to the plurality of second heat exchange plates is D4, in mm, where 0.8 ≤ D3 / D4 ≤ 1.

2.

5. The battery pack according to claim 4, characterized in that, 25mm≤D3≤137mm, and / or, 25mm≤D4≤137mm.

6. The battery pack according to claim 1, characterized in that, The plurality of batteries includes multiple rows of batteries, each row of batteries is stacked along a third direction perpendicular to both the first direction and the second direction, the multiple rows of batteries are arranged along the second direction, each battery has an explosion-proof valve on the side of the first side, two adjacent heat exchange plates cover two side portions of the side of each battery in the same row of batteries, and the explosion-proof valve is located between the two side portions.

7. The battery pack according to claim 6, characterized in that, The minimum distance from the explosion-proof valve to the two heat exchange plates is D5, in mm. The dimension of the battery in the second direction is W1, in mm. 0.0003≤D5 / W1≤0.

42.

8. The battery pack according to claim 7, characterized in that, 0.2mm≤D5≤62.5mm, and / or, 148mm≤W1≤685mm.

9. The battery pack according to claim 6, characterized in that, The battery also has two terminals, which are respectively located on the two side portions.

10. The battery pack according to any one of claims 6 to 9, characterized in that, In the second direction, the two adjacent side portions of two adjacent batteries are covered by the same second heat exchange plate.

11. The battery pack according to any one of claims 6 to 9, characterized in that, Each second heat exchange plate covers only one side portion of each cell in a row of cells.

12. The battery pack according to claim 1, characterized in that, The plurality of second heat exchange plates are two second heat exchange plates.

13. The battery pack according to claim 12, characterized in that, The port portion of each second heat exchange plate connected to the mixing element tends to be closer to the inside and gradually tilts towards the other end of the second heat exchange plate.

14. The battery pack according to claim 1, characterized in that, The distance from the outer edge of each first heat exchange plate along the second direction to the outer edge of the entire plurality of batteries is D6, in mm, and the dimension of each battery in the second direction is W1, in mm, 0.0002≤D6 / W1≤0.

41.

15. The battery pack according to claim 14, characterized in that, 0.1mm≤D6≤62mm, and / or, 148mm≤W1≤685mm.

16. The battery pack according to claim 1, characterized in that, Each second heat exchange plate has a distribution cavity and multiple flow channels inside. The multiple flow channels are connected to the mixing cavity through the distribution cavity, and the fluid from the mixing cavity is distributed to the multiple flow channels through the distribution cavity.

17. The battery pack according to claim 1, characterized in that, It also includes a port component, wherein the mixing component is disposed at one end of the plurality of heat exchange plates in a third direction, the port component is disposed at the other end of the plurality of heat exchange plates in the third direction, the port component is provided with a return cavity, and the fluid from the plurality of flow channels of the plurality of second heat exchange plates flows into the return cavity and flows out through at least one return port, wherein the third direction is perpendicular to both the first direction and the second direction.

18. The battery pack according to claim 17, characterized in that, The port component also includes two liquid inlet chambers, which are separated from the return chamber by two isolation members. Fluid flows into the liquid inlet chambers through the two liquid inlet ports and into the two first heat exchange plates respectively.

19. The battery pack according to claim 1, characterized in that, The mixing chamber is fluidly connected through the bypass inlet port.

20. An electrical appliance, characterized in that, Includes the battery pack according to any one of claims 1 to 19.

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