Battery box body and battery pack

Abstract

The utility model discloses a battery box body which comprises a box body main body, an inner supporting beam body of the box body main body is provided with a flow guide inner channel and an output pipe connecting piece, and the output pipe connecting piece is communicated with the flow guide inner channel; the liquid cooling assembly comprises a first flow dividing piece and a second flow dividing piece which are oppositely arranged, the liquid cooling assembly is installed in the box body, the flow guiding inner channel is arranged between the first flow dividing piece and the second flow dividing piece in a penetrating mode, and the first flow dividing piece and the second flow dividing piece both communicate with the output pipe connecting piece; the first flow dividing piece guides a heat exchange medium to be conveyed from one side close to the flow guide inner channel in the diagonal direction of the flow guide inner channel, and the second flow dividing piece guides the heat exchange medium to be conveyed from one side close to the flow guide inner channel in the diagonal direction of the flow guide inner channel. The problems that an existing liquid cooling plate is complex in pipeline, too long in flow channel, large in flow channel pressure drop and low in cooling efficiency are solved.

Description

Technical Field

[0001] The utility model relates to the field of batteries, and in particular to a battery box and a battery pack. Background Art

[0002] Existing battery packs generate heat during the charging and discharging process, but excessively high temperatures or large temperature differences will seriously affect the performance and life of the battery pack.

[0003] In view of the above-mentioned influencing factors, the liquid cooling solution adopted by the thermal management design commonly used in the industry now mainly adopts liquid cooling plates for cooling, and the existing liquid cooling plates are all designed to optimize the flow channel design of thermal management. However, such existing liquid cooling plates generally have the following disadvantages: complex pipelines, too long flow channels, large flow channel pressure drop, and low cooling efficiency. This leads to large temperature differences and poor durability in different positions of the existing battery pack. Utility Model Content

[0004] In order to overcome at least one defect of the above-mentioned prior art, the utility model provides a battery case, a battery pack and a method for manufacturing the battery case, which solves the problems of complex pipelines, long flow channels, large flow channel pressure drop and low cooling efficiency existing in the existing liquid cooling plate.

[0005] The technical solution adopted by the utility model to solve the problem is:

[0006] A battery box, comprising:

[0007] A box body, wherein an inner guide channel and an output pipe connector are provided on the inner support beam of the box body, and the output pipe connector is connected to the inner guide channel;

[0008] A liquid cooling component, the liquid cooling component includes a first flow divider and a second flow divider arranged opposite to each other, the liquid cooling component is installed in the box body, the inner flow guide channel is arranged between the first flow divider and the second flow divider, and the first flow divider and the second flow divider are both connected to the output pipe connector, and the first flow divider guides the heat exchange medium to be transmitted along its diagonal direction from the side close to the inner flow guide channel, and the second flow divider guides the heat exchange medium to be transmitted along its diagonal direction from the side close to the inner flow guide channel.

[0009] In some embodiments of the utility model, a plurality of the liquid cooling components are included, and the plurality of the liquid cooling components are arranged along the extension direction of the inner flow guide channel, and the inner flow guide channel passes through each of the liquid cooling components in turn, and a plurality of the output pipe connectors are evenly arranged on the inner flow guide channel, and each of the liquid cooling components is arranged correspondingly to each of the output pipe connectors.

[0010] In some embodiments of the utility model, two relatively distributed liquid cooling components are included, two output pipe connectors are arranged on the inner guide channel, and the two output pipe connectors are both located in the middle part of the inner support beam body, and each liquid cooling component is arranged corresponding to each output pipe connector.

[0011] In some embodiments of the present invention, the box body also includes an outer protective shell, a return inner channel is provided on the outer protective shell, the inner support beam is fixedly connected to the interior of the outer protective shell, and the first diverter and the second diverter are both connected to the return inner channel.

[0012] In some embodiments of the present utility model, the inner reflux channel includes a first reflux pipe and a second reflux pipe, the first reflux pipe and the second reflux pipe are both arranged parallel to the inner guide channel, the first diverter is located between the first reflux pipe and the inner guide channel, the first diverter is connected to the first reflux pipe through a first pipe connector, the second diverter is located between the second reflux pipe and the inner guide channel, and the second diverter is connected to the second reflux pipe through a second pipe connector.

[0013] In some embodiments of the present utility model, the output pipe connector includes a first output portion and a second output portion, the first output portion and the second output portion are relatively distributed, the first output portion and the second output portion are fixedly connected to the inner support beam, the first diverter is connected to the inner guide channel through the first output portion, and the second diverter is connected to the inner guide channel through the second output portion.

[0014] In some embodiments of the present utility model, the first flow divider includes a first flow divider, and a first input port, a first output port, and a first inner flow tube arranged on the first flow divider, the first input port and the first output port are respectively located at two opposite diagonals of the first flow divider, the first inner flow tube extends from one side of the first input port toward one side of the first output port, and the first input port and the first output port are both connected to the first inner flow tube, and the first input port is connected to the output pipe connector through a first pipeline.

[0015] In some embodiments of the present utility model, the second flow divider includes a second flow divider, and a second input port, a second output port, and a second inner flow tube arranged on the second flow divider, the second input port and the second output port are respectively located at two opposite diagonals of the second flow divider, the second inner flow tube extends from one side of the second input port toward one side of the second output port, and the second input port and the second output port are both connected to the second inner flow tube, and the second input port is connected to the output pipe connector through a second pipeline.

[0016] The utility model also discloses a battery pack, comprising:

[0017] The battery box mentioned above;

[0018] A battery pack is installed in the box body of the battery box, and the battery pack is heat exchanged with the liquid cooling component.

[0019] The utility model also discloses a method for manufacturing the above-mentioned battery box, comprising:

[0020] A first upper plate of the first flow divider is extruded by a first die, and a first lower plate of the first flow divider is extruded by a second die, and then the first upper plate and the first lower plate are mirror-joined and welded to form the first flow divider;

[0021] The second upper plate of the second flow divider is extruded and formed by the first die, and the second lower plate of the second flow divider is extruded and formed by the second die, and then the second upper plate and the second lower plate are mirror-joined and welded to form the second flow divider;

[0022] The box body is formed by welding process;

[0023] The first flow divider and the second flow divider are placed in the box body one by one, and the first flow divider and the second flow divider are placed on two opposite sides of the inner support beam of the box body.

[0024] In summary, the battery box, battery pack and method for manufacturing the battery box provided by the utility model have the following technical effects:

[0025] Through the cooperation between the guide inner channel configured by the inner support beam of the box body and the liquid cooling component, not only the diversion of the input heat exchange medium is made simpler, thereby solving the problems of complex pipelines, excessively long flow channels, and large flow channel pressure drop existing in the existing liquid cooling plate, but also, since the heat exchange medium injected into the liquid cooling component flows and is transmitted along the diagonal direction of the first diverter and along the diagonal direction of the second diverter, it can well cool the relatively high temperature part in the middle of the battery pack, thereby solving the problem of low cooling efficiency of the existing liquid cooling plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a first structural schematic diagram of a battery box of the utility model;

[0027] Figure 2 This is a schematic diagram of the top view of a battery box of the utility model;

[0028] Figure 3This is a second partial assembly diagram of a battery box of the utility model;

[0029] Figure 4 It is a schematic diagram of the temperature distribution of the first flow divider in the utility model;

[0030] Figure 5 This is a schematic diagram of the temperature distribution of a battery box of the utility model;

[0031] Figure 6 A temperature distribution diagram of a first ratio of the first flow diverter in the utility model;

[0032] Figure 7 A temperature distribution diagram of a second ratio of the first flow divider in the utility model;

[0033] Figure 8 A temperature distribution diagram of a third ratio of the first flow divider in the utility model;

[0034] Fig. 9 A temperature distribution diagram of a fourth ratio of the first flow divider in the utility model;

[0035] Fig.10 This is a data diagram of the temperature difference and area ratio of the first diverter in the utility model.

[0036] Icon: 1-box body, 11-inner supporting beam, 12-outer protective shell, 13-output pipe connector, 131-first output part, 132-second output part, 141-first return pipe, 142-second return pipe, 151-first pipe connector, 152-second pipe connector, 16-flow guide inner channel, 2-liquid cooling assembly, 21-first flow divider, 211-first flow divider, 212-first input port, 213-first output port, 214-first inner flow pipe, 2141-first inner main pipe, 2142-first inner side pipe, 2143-first outer flow pipe, 22-second flow divider, 221-second flow divider, 222-second input port, 223-second output port, 224-second inner flow pipe, 2241-second inner main pipe, 2242-second inner pipe, 2243-second outer flow pipe. DETAILED DESCRIPTION

[0037] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0040] Please combine the specific Figures 1 to 5 As shown, the utility model discloses a battery box, including a box body 1, wherein the box body 1 includes an outer protective shell 12. Generally, the box body 1 has an upper box cover and a lower box body, and the upper box cover is detachably connected to the top of the lower box body. The detachable connection here can be selected as a bolt connection, a snap connection, a magnetic connection, or any combination of the above two connection methods, or a combination of the above three connection methods. It should be noted that since the upper box cover belongs to a relatively mature conventional technology in the battery field, and the utility model does not make a major improvement on the upper box cover, therefore, this embodiment does not make too many redundant descriptions of the upper box cover, and does not display the upper box cover in the drawings of the specification.

[0041] It can be understood that the lower box body is mainly formed by the shell bottom plate and four shell side plates, and the shell bottom plate and the four shells are formed to form a battery box cavity. Among them, the four shell side plates are fixedly connected to the shell bottom plate respectively, and two adjacent shell side plates are fixedly connected. The fixed connection here can be bolted, clamped, welded, or integrally formed.

[0042] In the current battery assembly process, the battery pack and related electrical components are first assembled and fixed to the inner cavity of the battery box of the lower box body, and then the upper box cover is closed to the lower box body, so that the battery pack and related electrical components are in a relatively sealed inner cavity of the battery box. This not only protects the battery pack and related electrical components from liquid and dust, but also protects the battery pack and related electrical components from damage by external squeezing or impact, thereby improving the stability of the battery pack and achieving the best performance.

[0043] Since each battery cell in the battery pack releases a certain amount of heat during charging and discharging, the heat released by several battery cells is gathered and retained in the relatively closed inner cavity of the battery box, which will cause the temperature of the inner cavity of the battery box to be too high. The battery pack is operated under relatively high temperature conditions, which will greatly reduce the working performance of each battery cell and make it impossible for the battery cell to operate at the best working performance.

[0044] In order to solve the problem of a large amount of heat accumulation in the inner cavity of the battery box, existing battery packs are usually equipped with a liquid cooling plate. When coolant is passed into the liquid cooling plate, a temperature difference is formed between the liquid cooling plate and the air in the inner cavity of the battery box, thereby absorbing the heat in the inner cavity of the battery box into the liquid cooling plate, achieving a cooling effect.

[0045] However, due to the layout of the battery pack in the inner cavity of the battery box and the connection relationship between the battery pack and the electrical components, a large amount of heat is mainly concentrated in the middle part of the inner cavity of the battery box, that is, the temperature distribution in the inner cavity of the battery box is usually low on the high-frequency side in the middle, and the existing liquid cooling plate adopts a comprehensive and balanced cooling method, which makes the cooling efficiency of the existing liquid cooling plate low.

[0046] Based on the problem of low cooling efficiency of the existing liquid cooling plate, the utility model provides an optimal improvement solution: Figure 1 and Figure 2 As shown, an inner support beam 11 is provided in the lower box body of the box body 1, and the inner support beam 11 is fixedly connected to the inside of the outer protective shell 12, that is, the inner support beam 11 is located in the inner cavity of the battery box, and the shell bottom plate and the shell side plate of the lower box body are fixedly connected to the inner support beam 11, preferably by welding, of course, bolt connection can also be selected, and the use of the inner support beam 11 can effectively improve the overall structural strength of the box body 1.

[0047] As the core solution of this embodiment, the inner support beam 11 is provided with an inner flow guiding channel 16, which can be directly processed inside the inner support beam 11, or can be formed by laying pipes in the cavity structure inside the inner support beam 11. The inner flow guiding channel 16 runs through the shell side plate of the lower box and is connected to the total input port on the lower box, so that the external heat exchange medium (such as water, coolant, etc.) can be transmitted to the inside of the inner flow guiding channel 16, and the battery cell close to one side of the inner support beam 11 can conduct a small part of the heat to the inner flow guiding channel 16, so as to achieve the purpose of heat exchange. In addition, the inner support beam 11 is also provided with an output pipe connector 13, which is connected to the inner flow guiding channel 16.

[0048] For further details, please refer to Figure 1 , Figure 2 and Figure 3As shown, the battery case also includes a liquid cooling component 2, which includes a first diverter 21 and a second diverter 22 arranged opposite to each other. The liquid cooling component 2 is installed in the case body 1, and the inner flow guide channel 16 is arranged between the first flow diverter 21 and the second flow diverter 22, so that the first flow diverter 21 and the second flow diverter 22 of the liquid cooling component 2 are disposed on two opposite sides of the inner flow guide channel 16, and the first flow diverter 21 and the second flow diverter 22 are both connected to the output pipe connector 13, so that the heat exchange medium inside the inner flow guide channel 16 can be diverted and injected into the first flow diverter 21 and the second flow diverter 22 through the output pipe connector 13. At the same time, the first diverter 21 guides the heat exchange medium to be transmitted along the diagonal direction from the side close to the guide inner channel 16, and the second diverter 22 guides the heat exchange medium to be transmitted along the diagonal direction from the side close to the guide inner channel 16, that is, under the guidance of the first diverter 21 and the second diverter 22, the heat exchange medium will be transmitted toward the diagonal position close to the first diverter 21 and toward the diagonal position close to the second diverter 22.

[0049] In this embodiment, when the heat exchange medium flows through the first flow divider 21 and the second flow divider 22, it will effectively exchange heat with the battery cells of the battery pack, thereby cooling each battery cell of the battery pack. On the one hand, compared with the existing single liquid cooling plate, the difficulty of production and processing can be greatly reduced, thereby greatly reducing the production cost of the liquid cooling component 2, and in the subsequent long-term use process, when the liquid cooling component 2 has leakage and other problems, it is only necessary to replace the corresponding first flow divider 21 and the second flow divider 22, which greatly reduces the subsequent maintenance cost of the battery pack.

[0050] On the other hand, the liquid cooling assembly 2 cooperates with the inner guide channel 16 on the inner support beam 11 to preferentially cool the middle part of the battery pack, that is, Figure 1 , Figure 2 and Figure 3 As shown, the battery group in the battery pack will be divided into a first battery module corresponding to the first diverter 21 and a second battery module corresponding to the second diverter 22 during the manufacturing and assembly process. At this time, the first battery module and the second battery module will be separated on two opposite sides of the inner support beam 11, which is equivalent to the heat exchange medium flowing through the middle part of the battery pack under the guidance of the guide inner channel 16 and performing preliminary heat exchange with the heat exchange medium in the guide inner channel 16.

[0051] At the same time, if Figure 1 , Figure 2 and Figure 3As shown, the heat exchange medium is transmitted along the diagonal direction of the first flow divider 21 and the second flow divider 22, which can not only increase the transmission distance and heat exchange time of the heat exchange medium in the first flow divider 21 and the second flow divider 22, but also effectively improve the heat exchange efficiency of the heat exchange medium. At the same time, it also flows through the middle part of the first battery module and the second battery module, and the high-temperature part between the first battery module and the second battery module is cooled down in a targeted manner. In this way, it is equivalent to preferentially cooling the middle high-temperature part of the battery pack / battery group, reducing the temperature difference of the battery pack and improving the thermal management efficiency.

[0052] In addition, by configuring the inner flow-guiding channel 16 on the inner support beam 11, it is possible to avoid laying pipelines in the inner cavity of the battery box, greatly reducing the risk of the battery pack short-circuiting due to the leakage of liquid from the aging pipeline to the battery pack, and also reducing the space occupied by the pipeline in the inner cavity of the battery box, which is conducive to saving the internal space of the battery pack and the exquisite design of the battery box, and is also conducive to the purpose of compact assembly of the battery pack. Furthermore, the weight of the box body 1 / the battery box as a whole is reduced, which is conducive to the lightweight design of the battery box.

[0053] It should be supplemented that the extension length of the flow-guiding inner channel 16 can be set according to the structural design or design requirements. For example, if the extension length of the flow-guiding inner channel 16 is one-tenth of the length of the inner support beam 11, or if the extension length of the flow-guiding inner channel 16 is one-fifth of the length of the inner support beam 11, the heat exchange medium is diverted on the side close to the total input port. Alternatively, if the extension length of the flow-guiding inner channel 16 is equal to the length of the inner support beam 11, the heat exchange medium is diverted on the side away from the total input port, and the heat exchange medium flows from the total input port into the flow-guiding inner channel 16, flows through the entire inner support beam 11 along the extension direction of the flow-guiding inner channel 16, and finally diverts to the first diverter 21 and the second diverter 22 through the output pipe connector 13.

[0054] For further details, please refer to Figure 2 As shown, a reflux inner channel 14 is provided on the outer protective shell 12, and specifically, the reflux inner channel 14 is provided on the lower box body of the outer protective shell 12, and the first diverter 21 and the second diverter 22 are both connected to the reflux inner channel 14, so that the heat exchange medium flowing through the first diverter 21 and the second diverter 22 can be collected and transmitted to the reflux inner channel 14, and under the guidance of the reflux inner channel 14, the heat exchange medium is guided out of the box body 1, so as to achieve the purpose of discharging a large amount of heat from the box body 1 in time.

[0055] It should be noted that, according to the structural design and design requirements, there can be one reflux internal channel 14, and the reflux internal channel 14 can extend along the circumferential direction of the lower box body. In this way, a single total output port can be configured in the lower box body, and the total output port is connected to the reflux internal channel 14. When the first diverter 21 and the second diverter 22 are both connected to the reflux internal channel 14, the heat exchange medium carrying a large amount of heat will be gathered and flowed into the reflux internal channel 14, and guided out of the box body 1 through the total output port.

[0056] In addition, the utility model author also provides another preferred method, please refer to Figure 2 As shown, the reflux inner channel 14 includes a first reflux pipe 141 and a second reflux pipe 142, and the first reflux pipe 141 and the second reflux pipe 142 are both arranged parallel to the guide inner channel 16, and the first reflux pipe 141 and the second reflux pipe 142 are respectively configured with a total output port, wherein the first diverter 21 is located between the first reflux pipe 141 and the guide inner channel 16, and the first diverter 21 is connected to the first reflux pipe 141 through the first pipe connector 151, and the second diverter 22 is located between the second reflux pipe 142 and the guide inner channel 16, and the second diverter 22 is connected to the second reflux pipe 142 through the second pipe connector 152.

[0057] In this way, the distance and time of the heat exchange medium carrying a large amount of heat on the lower box body are greatly shortened, achieving the purpose of timely discharge of heat. At the same time, compared with the method of extending a return inner channel 14 along the circumferential direction of the lower box body, the process of forming the first return pipe 141 and the second return pipe 142 on the lower box body is more convenient, the processing difficulty is also lower, and it is conducive to reducing the processing cost.

[0058] It is understandable that forming the return inner channel 14 on the lower box body can also avoid laying pipelines in the inner cavity of the battery box, reducing the risk of the battery pack short-circuiting due to the leakage of liquid into the battery pack due to aging of the pipeline, and further reducing the space occupied by the pipeline in the inner cavity of the battery box, which is conducive to saving the internal space of the battery pack and the exquisite design of the battery box, and is also conducive to the purpose of compact assembly of the battery pack. At the same time, it further reduces the weight of the box body 1 / the battery box as a whole, which is conducive to the lightweight design of the battery box.

[0059] As one of the preferred methods of this embodiment, please refer to Figure 3 As shown, the battery case includes a plurality of liquid cooling components 2, and the plurality of liquid cooling components 2 are arranged along the extension direction of the guide inner channel 16, and the guide inner channel 16 passes through each liquid cooling component 2 in turn, so that the heat exchange medium flows through the first diverter 21 and the second diverter 22 of each liquid cooling component 2 under the guidance of the guide inner channel 16, thereby targetedly cooling the middle high-temperature part of each battery pack to achieve the purpose of efficient thermal management.

[0060] Furthermore, a plurality of output pipe connectors 13 are arranged on the inner flow guide channel 16, and the plurality of output pipe connectors 13 are evenly distributed to avoid excessive concentration of pressure drop in the inner flow guide channel 16. Each liquid cooling assembly 2 is arranged corresponding to each output pipe connector 13. In this way, the overall installation of the battery box and the battery pack is more orderly and convenient for subsequent maintenance and inspection.

[0061] As another preferred method of this embodiment, please refer to Figure 1 to Figure 2 As shown, it includes two relatively distributed liquid cooling components 2, and the two first flow dividers 21 and the two second flow dividers 22 will be formed into a four-square grid distribution. Two output pipe connectors 13 are arranged on the inner flow guide channel 16, and the two output pipe connectors 13 are both located in the middle part of the inner support beam body 11, and each liquid cooling component 2 is arranged corresponding to each output pipe connector 13. In this way, the heat exchange medium in the inner flow guide channel 16 will be diverted and diffused in the middle part of the inner support beam body 11 to the two first flow dividers 21 and the two second flow dividers 22, so that the high-temperature part in the middle of the two adjacent battery packs can also be cooled in a targeted manner, avoiding the problem of local high temperature due to heat accumulation between the two adjacent battery packs. At the same time, as the heat exchange medium flows and diffuses along the diagonal direction of the first flow divider 21 and the second flow divider 22, the middle part of each battery pack can also be preferentially cooled.

[0062] It is additionally explained here that the above-mentioned output pipe connector 13 includes a first output part 131 and a second output part 132, the first output part 131 and the second output part 132 are relatively distributed, and the first output part 131 and the second output part 132 are both connected to the guide inner channel 16, then when the heat exchange medium inside the guide inner channel 16 flows to the position of the output pipe connector 13, it will be transmitted to the first output part 131 and the second output part 132 respectively, the first output part 131 and the second output part 132 are both fixedly connected to the inner support beam 11, the first diverter 21 is connected to the guide inner channel 16 through the first output part 131, and the second diverter 22 is connected to the guide inner channel 16 through the second output part 132.

[0063] As a preferred method of this embodiment, please refer to Figure 1 and Figure 2As shown, the first flow divider 21 includes a first flow divider 211, and a first input port 212, a first output port 213, and a first inner flow tube 214 arranged on the first flow divider 211. The first input port 212 and the first output port 213 are respectively located at two opposite diagonals of the first flow divider 211. The first inner flow tube 214 extends from one side of the first input port 212 toward one side of the first output port 213. The first input port 212 and the first output port 213 are both connected to the first inner flow tube 214. The first input port 212 is connected to the output pipe connector 13 through a pipeline.

[0064] Specifically, Figure 2 As shown, one end of the first pipe is connected to the first input port 212 of the first flow divider 21, and the other end of the first pipe is connected to the first output portion 131 of the output pipe connector 13, so as to guide the heat exchange medium from the first output portion 131 to the inside of the first flow divider 21. The first inner flow pipe 214 includes a first inner main pipe 2141, a first inner side pipe 2142 and a first outer flow pipe 2143, the first outer flow pipe 2143 extends along the circumference of the first flow divider 211, and the first input port 212 and the first output port 213 are both connected to the first outer flow pipe 2143.

[0065] Further, the first inner main pipe 2141 and the first inner side pipe 2142 both extend from one side of the first input port 212 toward one side of the first output port 213, wherein the first input port 212 and the first output port 213 are both connected to the first inner main pipe 2141 of the first inner flow pipe 214, and both ends of the first inner side pipe 2142 are both connected to the first outer flow pipe 2143. Optionally, the first inner pipe 2142 is a straight pipe, or a curved pipe (such as an arc-shaped pipe, a wavy pipe, etc.), or a folded line pipe (a trapezoidal folded line pipe, a triangular folded line pipe, etc.).

[0066] According to Poiseuille's law, when a fluid moves in a horizontal circular tube in laminar flow, its volume flow rate Q has the following relationship with the pressure difference Δp at both ends of the tube, the radius r of the tube, the length L, and the viscosity coefficient η of the fluid:

[0067]

[0068] In this way, the extension length of the first inner main pipe 2141 is 1.414 times the extension length of the first inner side pipe 2142 away from the first inner main pipe 2141. Assuming that the diameter of the first inner main pipe 2141 is the same as that of the first inner side pipe 2142, the flow rate of the first inner main pipe 2141 can be simply calculated according to Poiseuille's law as 1.414 times the flow rate of the first inner side pipe 2142 away from the first inner main pipe 2141. Therefore, the first inner main pipe 2141 takes away more heat. Figure 4 As shown, the diameter of the first inner main pipe 2141 and the diameter of the first inner side pipe 2142 are set to 0.5 cm, the initial temperature of the first diverter 21 is 40°C, the inlet temperature of the coolant is 20°C, the flow rate is 10L / min, and the heat exchange power is 1000W. Then, the middle temperature of the first diverter 21 is the lowest, and the temperature difference is about 5°C.

[0069] As a preferred method of this embodiment, please refer to Figure 1 and Figure 2 As shown, the second flow divider 22 includes a second flow divider 221, and a second input port 222, a second output port 223, and a second inner flow tube 224 arranged on the second flow divider 221. The second input port 222 and the second output port 223 are respectively located at two opposite diagonals of the second flow divider 221. The second inner flow tube 224 extends from one side of the second input port 222 toward the second output port 223. The second input port 222 and the second output port 223 are both connected to the second inner flow tube 224. The second input port 222 is connected to the output pipe connector 13 through a second pipeline.

[0070] Specifically, Figure 2 As shown, one end of the second pipe is connected to the second input port 222 of the second flow divider 22, and the other end of the second pipe is connected to the second output portion 132 of the output pipe connector 13, so as to guide the heat exchange medium from the second output portion 132 to the inside of the second flow divider 22. The second inner flow pipe 224 includes a second inner main pipe 2241, a second inner pipe 2242 and a second outer flow pipe 2243, the second outer flow pipe 2243 extends along the circumference of the second flow divider 221, and the second input port 222 and the second output port 223 are both connected to the second outer flow pipe 2243.

[0071] Further, the second inner main pipe 2241 and the second inner side pipe 2242 both extend from one side of the second input port 222 toward one side of the second output port 223, wherein the second input port 222 and the second output port 223 are both connected to the second inner main pipe 2241 of the second inner flow pipe 224, and both ends of the second inner pipe 2242 are both connected to the second outer flow pipe 2243. Optionally, the second inner pipe 2242 is a straight pipe, or a curved pipe (such as an arc pipe, a wavy pipe, etc.), or a folded line pipe (a trapezoidal folded line pipe, a triangular folded line pipe, etc.).

[0072] So, like Figure 4As shown, the extension length of the second inner main pipe 2241 is 1.414 times the extension length of the second inner tube 2242 away from the side of the second inner main pipe 2241. Assuming that the diameter of the second inner main pipe 2241 is the same as the diameter of the second inner tube 2242, it can be simply calculated according to Poiseuille's law that the flow rate of the second inner main pipe 2241 is 1.414 times the flow rate of the second inner tube 2242 away from the side of the second inner main pipe 2241, so the second inner main pipe 2241 takes away more heat.

[0073] The unexpected effect is that Figure 5 As shown, taking two relatively distributed liquid cooling components 2 as an example, the temperature in the middle of the battery case and the battery pack is the lowest, so it is easier to take away the heat in the middle of the battery pack. Through the cooperation of the two first diverters 21 and the two second diverters 22, the purpose of targeted cooling of the high-temperature parts in the middle of two adjacent battery packs is achieved, thus avoiding the problem of local high temperature caused by heat accumulation between two adjacent battery packs. Therefore, through the initial diversion of the inner flow guide channel 16, the second diversion of the first diverter 21, and the second diversion of the second diverter 22, the high-temperature parts in the middle of the battery pack and the battery pack can be quickly cooled.

[0074] It should be noted that the specific Figures 6 to 9 As shown, Figure 6 The total number of the first inner main pipe 2141 and the first inner side pipe 2142 is 3. Figure 7 The total number of the first inner main pipe 2141 and the first inner side pipe 2142 is 9. Figure 8 The total number of the first inner main pipe 2141 and the first inner side pipe 2142 is 13. Fig. 9 The total number of the first inner main pipe 2141 and the first inner side pipe 2142 is 19. Figures 5 to 8 The first flow divider 21 on the left side is at a heat exchange power of 1 KW, and the first flow divider 21 on the right side is at a heat exchange power of 2 KW.

[0075] The total number of the first inner main pipe 2141 and the first inner tube 2142 is between 9 and 13. Preferably, the total number of the first inner main pipe 2141 and the first inner tube 2142 is 13. When the total number of the first inner main pipe 2141 and the first inner tube 2142 is less than 9 or greater than 13, the temperature difference is relatively large. The total number of the first inner main pipe 2141 and the first inner tube 2142 is between 9 and 13. In this way, it can effectively ensure that the temperature difference of the first diverter 21 is relatively small, and it is well considered that the middle part of the first diverter 21 and the peripheral part of the first diverter 21 can absorb heat. At the same time, it can also avoid the problem of the spacing between the first inner main pipe 2141 and the first inner tube 2142 and the spacing between two adjacent first inner tubes 2142 being too dense or too sparse.

[0076] In addition, the area occupied by the first inner main pipe 2141, the first outer flow pipe 2143 and the first inner side pipe 2142 in the orthographic projection direction of the heat exchange top surface of the first flow divider 21 is defined as the total pipe area. The heat exchange top surface referred to here is the side surface of the first flow divider 21 with the largest area.

[0077] Please combine the specific Figures 6 to 10 As shown, Figure 6 The ratio between the total pipeline area and the total area of ​​the first flow divider 21 is 8%. Figure 7 The ratio between the total pipeline area and the total area of ​​the first flow divider 21 is 13%. Figure 8 The ratio between the total pipeline area and the total area of ​​the first flow divider 21 is 19%. Fig. 9 The ratio between the total pipeline area and the total area of ​​the first flow divider 21 is 22%. Fig.10 The area ratio is reduced by 3.14, which is the ratio between the total pipeline area and the total area of ​​the first diverter 21.

[0078] The ratio of the total pipeline area to the total area of ​​the first flow divider 21 is 13%-19%, wherein the preferred ratio of the total pipeline area to the total area of ​​the first flow divider 21 is 14%. Thus, when the ratio of the total pipeline area to the total area of ​​the first flow divider 21 is 13%-19%, it can effectively ensure that the temperature difference is relatively small, and both the middle part of the first flow divider 21 and the peripheral part of the first flow divider 21 can absorb heat, that is, the heat absorption efficiency of the first flow divider 21 is relatively high.

[0079] It should also be noted that the above-mentioned number of pipes and area ratio are also applicable to the second flow dividing member 22 .

[0080] Based on the structure of the above-mentioned battery box and its connection relationship, the utility model also discloses a battery pack, including a battery box and a battery pack, the battery pack is installed in the box body 1 of the battery box, and the battery pack and the liquid cooling component 2 are heat exchanged.

[0081] In addition, the utility model also discloses a method for manufacturing the above-mentioned battery box, comprising:

[0082] Step STEP 1: using a first die to extrude and form a first upper plate of the first diverter 21, and using a second die to extrude and form a first lower plate of the first diverter 21, and then mirror-joining and welding the first upper plate and the first lower plate to form the first diverter 21;

[0083] Step STEP2: using the first die to extrude and form the second upper plate of the second diverter 22, and using the second die to extrude and form the second lower plate of the second diverter 22, and then mirror-joining and welding the second upper plate and the second lower plate to form the second diverter 22;

[0084] Step STEP3: Forming the box body 1 by welding process;

[0085] Step STEP 4: Place the first flow divider 21 and the second flow divider 22 into the box body 1 one by one, and the first flow divider 21 and the second flow divider 22 are placed on two opposite sides of the inner support beam 11 of the box body 1.

[0086] The technical means disclosed in the solution of the utility model are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the utility model, and these improvements and modifications are also regarded as the protection scope of the utility model.

Claims

1. A battery box, characterized in that: include: A box body (1), wherein an inner support beam (11) of the box body (1) is provided with an inner flow guiding channel (16) and an output pipe connector (13), and the output pipe connector (13) is connected to the inner flow guiding channel (16); A liquid cooling component (2), the liquid cooling component (2) comprising a first flow divider (21) and a second flow divider (22) arranged opposite to each other, the liquid cooling component (2) being installed in the box body (1), the inner flow guide channel (16) being arranged between the first flow divider (21) and the second flow divider (22), and the first flow divider (21) and the second flow divider (22) being both connected to the output pipe connector (13), and the first flow divider (21) guiding the heat exchange medium to be transmitted along the diagonal direction of the inner flow guide channel (16) from the side close to the inner flow guide channel (16), and the second flow divider (22) guiding the heat exchange medium to be transmitted along the diagonal direction of the inner flow guide channel (16) from the side close to the inner flow guide channel (16).

2. The battery box according to claim 1, characterized in that: The invention comprises a plurality of the liquid cooling components (2), wherein the plurality of the liquid cooling components (2) are arranged along the extension direction of the inner flow guide channel (16), and the inner flow guide channel (16) passes through each of the liquid cooling components (2) in sequence, and a plurality of the output pipe connectors (13) are evenly arranged on the inner flow guide channel (16), and each of the liquid cooling components (2) is arranged correspondingly to each of the output pipe connectors (13).

3. The battery box according to claim 1, characterized in that: It comprises two relatively distributed liquid cooling components (2), two output pipe connectors (13) are arranged on the inner flow guide channel (16), and the two output pipe connectors (13) are both located in the middle of the inner support beam (11), and each of the liquid cooling components (2) is arranged correspondingly to each of the output pipe connectors (13).

4. The battery case according to any one of claims 1 to 3, characterized in that: The box body (1) further comprises an outer protective shell (12), a return inner channel is provided on the outer protective shell (12), the inner support beam (11) is fixedly connected to the inside of the outer protective shell (12), and the first flow divider (21) and the second flow divider (22) are both connected to the return inner channel.

5. The battery case according to claim 4, characterized in that: The inner reflux channel comprises a first reflux pipe (141) and a second reflux pipe (142); the first reflux pipe (141) and the second reflux pipe (142) are both arranged parallel to the inner flow guiding channel (16); the first flow dividing piece (21) is located between the first reflux pipe (141) and the inner flow guiding channel (16); the first flow dividing piece (21) is connected to the first reflux pipe (141) via a first pipe connector (151); the second flow dividing piece (22) is located between the second reflux pipe (142) and the inner flow guiding channel (16); the second flow dividing piece (22) is connected to the second reflux pipe (142) via a second pipe connector (152).

6. The battery case according to any one of claims 1 to 3, characterized in that: The output pipe connector (13) comprises a first output portion (131) and a second output portion (132); the first output portion (131) and the second output portion (132) are relatively distributed; the first output portion (131) and the second output portion (132) are both fixedly connected to the inner support beam body (11); the first flow divider (21) is connected to the inner flow guide channel (16) via the first output portion (131); and the second flow divider (22) is connected to the inner flow guide channel (16) via the second output portion (132).

7. The battery case according to any one of claims 1 to 3, characterized in that: The first flow dividing member (21) comprises a first flow dividing body (211), and a first input port (212), a first output port (213), and a first inner flow tube (214) arranged on the first flow dividing body (211); the first input port (212) and the first output port (213) are respectively located at two opposite diagonals of the first flow dividing body (211); the first inner flow tube (214) extends from one side of the first input port (212) toward one side of the first output port (213); the first input port (212) and the first output port (213) are both connected to the first inner flow tube (214); and the first input port (212) is connected to the output pipe connector (13) via a first pipeline.

8. The battery case according to any one of claims 1 to 3, characterized in that: The second flow dividing member (22) comprises a second flow dividing body (221), and a second input port (222), a second output port (223), and a second inner flow pipe (224) arranged on the second flow dividing body (221); the second input port (222) and the second output port (223) are respectively located at two opposite diagonals of the second flow dividing body (221); the second inner flow pipe (224) extends from one side of the second input port (222) toward one side of the second output port (223); the second input port (222) and the second output port (223) are both connected to the second inner flow pipe (224); and the second input port (222) is connected to the output pipe connector (13) via a second pipeline.

9. A battery pack, characterized in that: include: The battery case according to any one of claims 1 to 8; A battery pack is installed in a box body (1) of the battery box, and the battery pack is heat exchanged with the liquid cooling component (2).

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