Battery pack box body and battery pack

Abstract

The utility model relates to a battery pack box body and a battery pack, the battery pack box body is provided with a guide flow channel and a flow channel opening, the flow channel opening is communicated with the guide flow channel, the guide flow channel is used for defining a guide direction allowing a heat exchange working medium to pass through, and the flow channel opening is used for allowing the heat exchange working medium to pass through in the guide direction; and the through-flow sectional area of the guide runner close to the runner opening is smaller than that of the guide runner far away from the runner opening. According to the technical scheme, the through-flow sectional area, close to the flow channel opening, of the guide flow channel is smaller than the through-flow sectional area, away from the flow channel opening, of the guide flow channel, so that the flow of the heat exchange working medium, close to the flow channel opening, of the guide flow channel and the flow of the heat exchange working medium away from the flow channel opening tend to be uniform; therefore, the heat exchange working medium with uniform flow can exchange heat with the battery cells of the battery pack at different positions, the heat exchange uniformity of the battery cells at each position of the battery pack is improved, the phenomenon of non-uniform heat exchange of the battery pack is improved, and the service life of the battery pack is prolonged.

Description

Technical Field

[0001] This application relates to the field of power battery technology, and in particular to a battery pack housing and a battery pack. Background Technology

[0002] Cooling the battery pack can reduce the temperature of the power battery pack and prevent situations such as battery overheating or thermal runaway.

[0003] In related technologies, uneven heat exchange occurs in battery packs, which affects their lifespan. Utility Model Content

[0004] This application provides a battery pack housing and a battery pack, which improves the heat exchange uniformity of the battery pack, thereby at least partially solving the above-mentioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a battery pack housing is provided, the battery pack housing having:

[0006] A flow channel is used to define a guiding direction for the heat exchange medium to pass through; and

[0007] The flow channel is used to allow the heat exchange medium to pass through in the guiding direction;

[0008] The flow channel opening is connected to the guide flow channel;

[0009] Wherein, the flow cross-sectional area of ​​the guide channel near the channel opening is smaller than the flow cross-sectional area of ​​the guide channel away from the channel opening.

[0010] Optionally, the guide channel includes:

[0011] The first type of guiding channel defines a first guiding direction for the heat exchange medium to pass through;

[0012] The flow channel opening includes:

[0013] The flow channel inlet is used to allow the heat exchange working fluid to flow into the first type of guide flow channel along the first guiding direction;

[0014] Along the first guiding direction, the flow cross-sectional area of ​​the first type of guiding channel increases in a stepwise manner.

[0015] Optionally, the guide channel includes:

[0016] The second type of guiding channel defines a second guiding direction for the heat exchange medium to pass through;

[0017] The flow channel includes:

[0018] The flow channel outlet is used to allow the heat exchange working fluid to flow out of the second type of guide flow channel along the second guiding direction;

[0019] Along the second guiding direction, the flow cross-sectional area of ​​the second type of guiding channel decreases in a stepwise manner.

[0020] The first type of guide channel is arranged opposite to the second type of guide channel, and the first guide direction and the second guide direction are opposite.

[0021] Optionally, the battery pack housing includes:

[0022] The first beam is provided with a first groove structure for defining the first type of guide channel;

[0023] The second beam is provided with a second groove structure for defining the second type of guide channel;

[0024] The battery pack housing also has: a bottom plane;

[0025] The first beam and the second beam are arranged opposite to each other, and the vertical distance between the groove wall surface of the first groove structure near the bottom plane of the box and the bottom plane of the box is greater than the vertical distance between the groove wall surface of the second groove structure near the bottom plane of the box and the bottom plane of the box.

[0026] Optionally, the vertical distance between the groove wall surface of the first groove structure away from the bottom plane of the box and the bottom plane of the box is equal to the vertical distance between the battery cell surface away from the bottom plane of the box.

[0027] Optionally, the battery pack housing further includes:

[0028] The base plate is connected to the first beam and the second beam respectively;

[0029] The base plate is located between the first beam and the second beam.

[0030] According to a second aspect of this application, a battery pack is also provided, the battery pack including a battery pack housing as described above and battery cells, the battery cells being housed within the housing space of the battery pack housing.

[0031] Optionally, the battery pack further includes:

[0032] The first type of barrier is located between two adjacent cells in the first column;

[0033] The second type of barrier is located between two adjacent cells in the second column; and

[0034] The third type of barrier is located between two adjacent cells in the third column;

[0035] Wherein, the contact area between the first type of barrier and the battery cell is greater than the contact area between the second type of barrier and the battery cell, and the contact area between the second type of barrier and the battery cell is greater than the contact area between the third type of barrier and the battery cell.

[0036] Optionally, the first type of barrier includes:

[0037] The first part is attached to the edge surface of the battery cell, and the dimension of the first part along the first direction is the first dimension;

[0038] The second type of barrier includes:

[0039] The second part is attached to the edge surface of the battery cell, and the dimension of the second part along the first direction is the second dimension; and

[0040] The third type of barrier includes:

[0041] The third part is attached to the edge surface of the battery cell, and the dimension of the third part along the first direction is the third dimension;

[0042] Wherein, the first dimension is larger than the second dimension, and the second dimension is larger than the third dimension; the thickness of the first part, the thickness of the second part, and the thickness of the third part are equal.

[0043] Optionally, the first type of barrier includes:

[0044] The fourth part is attached to the central surface of the battery cell;

[0045] The second type of barrier includes:

[0046] The fifth part is attached to the central surface of the battery cell;

[0047] The thickness of the fourth part is less than the thickness of the first part, and the thickness of the fifth part is less than the thickness of the second part.

[0048] The beneficial effect of this application is that it provides a battery pack housing that improves the cooling uniformity of the battery pack.

[0049] More specifically, some embodiments of this application may produce the following specific beneficial effects:

[0050] In the battery pack housing of this embodiment, the battery pack housing has: a guide channel and a channel opening, wherein the channel opening is connected to the guide channel, and the guide channel is used to define a guiding direction for the heat exchange medium to pass through, and the channel opening is used for the heat exchange medium to pass through along the guiding direction, wherein the flow cross-sectional area of ​​the guide channel near the channel opening is smaller than the flow cross-sectional area of ​​the guide channel away from the channel opening. Through the above technical solution, by making the flow cross-sectional area of ​​the guide channel near the channel opening smaller than the flow cross-sectional area of ​​the guide channel away from the channel opening, the flow rate of the heat exchange medium near the channel opening and the flow rate of the heat exchange medium away from the channel opening tend to be uniform. This allows the uniformly flowed heat exchange medium to exchange heat with the battery cells at different locations in the battery pack, improving the heat exchange uniformity of the battery pack at various locations, mitigating the phenomenon of uneven heat exchange in the battery pack, and extending the service life of the battery pack.

[0051] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0052] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0053] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0054] Figure 1 This is a schematic diagram of the overall structure of the battery pack housing provided in an exemplary embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the overall structure of the battery pack housing provided in an exemplary embodiment of this application from another angle;

[0056] Figure 3 This is an exploded structural diagram of the battery pack provided in an exemplary embodiment of this application;

[0057] Figure 4 This is a top view of the battery pack provided in an exemplary embodiment of this application;

[0058] Figure 5 This is a schematic diagram of the connection structure between the first type of barrier and the battery cell provided in an exemplary embodiment of this application;

[0059] Figure 6 yes Figure 5 A magnified structural diagram at point A;

[0060] Figure 7 This is a schematic diagram of the connection structure between the second type of barrier and the battery cell provided in an exemplary embodiment of this application;

[0061] Figure 8 yes Figure 7 A magnified structural diagram at point B;

[0062] Figure 9 This is a schematic diagram of the connection structure between the third type of barrier and the battery cell provided in an exemplary embodiment of this application;

[0063] Figure 10 This is a schematic diagram of the flow of the heat exchange medium provided in an exemplary embodiment of this application;

[0064] Figure 11 This is a schematic diagram of the flow of the heat exchange medium provided in an exemplary embodiment of this application from another angle.

[0065] Explanation of reference numerals in the attached figures:

[0066] 10. Battery pack; 100. Battery pack housing; 100a. Internal space of the housing; 100b. Guide channel; 100b1. First type of guide channel; 100b2. Second type of guide channel; F1. First guide direction; F2. Second guide direction; 100c. Channel opening; 100c1. Channel inlet; 100c2. Channel outlet; 110. First beam; 110a. First groove structure; 120. Second beam; 120a. Second groove structure; 130. 1. Base plate; 130a. Box bottom plane; 140. Third beam; 150. Fourth beam; 160. Fifth beam; 200. Battery cell; 210. Outer side; 310. First type of barrier; 311. First part; 312. Fourth part; 320. Second type of barrier; 321. Second part; 322. Fifth part; 330. Third type of barrier; 331. Third part; 400. Cover plate; L1. First dimension; L2. Second dimension; L3. Third dimension. Detailed Implementation

[0067] 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0068] For ease of explanation, the corresponding figures use the directions of up, down, left, and right to illustrate the relative positional relationships between the parts of this application, and should not be construed as limiting the absolute positions.

[0069] Furthermore, in this application, the first direction corresponds to the up and down direction; similarly, the first direction here indicates the up and down direction only for the convenience of introducing the specific embodiments of this application, and there is no absolute correspondence between the first direction and the front and back directions.

[0070] The first orientation in this application is only for expressing relative positional relationships; they merely indicate approximate directions, not absolute geometric relationships.

[0071] According to the first aspect of this application, reference to Figure 1 and Figure 2 A battery pack housing 100 is provided, which has a guide channel 100b and a channel opening 100c. In this embodiment, the channel opening 100c is connected to the guide channel 100b.

[0072] In this embodiment, the guide channel 100b defines a guiding direction for the heat exchange medium to pass through, and the channel opening 100c allows the heat exchange medium to pass through along the guiding direction.

[0073] Among them, the flow cross-sectional area of ​​the guide channel 100b near the channel opening 100c is smaller than the flow cross-sectional area of ​​the guide channel 100b away from the channel opening 100c.

[0074] Through the above technical solution, the flow cross-sectional area of ​​the guide channel 100b near the channel opening 100c is smaller than the flow cross-sectional area of ​​the guide channel 100b away from the channel opening 100c. This makes the flow rate of the heat exchange medium near the channel opening 100c and the flow rate of the heat exchange medium away from the channel opening 100c more uniform. This allows the heat exchange medium with a uniform flow rate to exchange heat with the cells 200 of the battery pack 10 at different positions, improving the heat exchange uniformity of the battery pack 10 at different positions, improving the phenomenon of uneven cooling of the battery pack 10, and extending the service life of the battery pack 10.

[0075] Specifically, when the flow cross-sectional area of ​​the guide channel 100b changes, the flow velocity and pressure will change. That is, the cross-sectional area near the channel opening 100c is small, the flow velocity is high, and the flow resistance is low; as the cross-sectional area increases, the flow velocity decreases and the flow resistance increases.

[0076] The flow rate of the guide channel 100b near the flow outlet 100c is defined as Q1, and the flow rate of the guide channel 100b far from the flow outlet 100c is defined as Q2.

[0077] As can be seen from the above analysis, when the inflow rate at the flow channel 100c is constant, in the same guide channel 100b, the flow velocity is higher and the flow resistance is lower near the flow channel 100c, while the flow cross-sectional area is smaller. The flow velocity is lower and the flow resistance is higher away from the flow channel 100c, while the flow cross-sectional area is larger. Therefore, Q1 and Q2 tend to be equal, which enables the cells 200 at different positions of the battery pack 10 to exchange heat with the heat exchange medium of the same flow rate, thereby achieving the effect of uniform cooling of the battery pack 10.

[0078] In other words, in order to make the flow rates of the guide channels 100b near the channel opening 100c and far from the channel opening 100c tend to be equal, the flow resistance is small and the flow rate is large near the channel opening 100c, so the flow cross-sectional area needs to be reduced and its resistance increased to reduce the flow rate. The flow resistance is large and the flow rate is small far from the channel opening 100c, so the flow cross-sectional area needs to be increased and its resistance decreased to increase the flow rate. At the same time, the flow velocity is high near the channel opening 100c and the flow cross-sectional area is small, while the flow velocity is low far from the channel opening 100c and the flow cross-sectional area is large. Therefore, Q1 and Q2 tend to be equal.

[0079] In this embodiment, the heat exchange medium can be a low-temperature liquid. In this embodiment, the low-temperature liquid can achieve immersion cooling of the battery cells 200 of the battery pack 10, thereby cooling the battery cells 200 of the battery pack 10 and reducing the temperature difference between the battery cells 200 to cope with the continuous rise in temperature of the battery pack 10 under high-temperature environment.

[0080] In this embodiment, the heat exchange medium can also be a high-temperature liquid. In this embodiment, the high-temperature liquid can achieve immersion heating of the battery cells 200 of the battery pack 10, thereby heating the battery cells 200 of the battery pack 10 and reducing the temperature difference between the battery cells 200. This is to cope with the situation where the battery pack 10 is at a low temperature and cannot work normally in a low-temperature environment.

[0081] In some embodiments, see Figure 10 and Figure 11 The guiding channel 100b includes: a first type of guiding channel 100b1, which can define a first guiding direction F1 for the heat exchange medium to pass through.

[0082] The flow channel 100c in this embodiment includes: a flow channel inlet 100c1, used to allow the heat exchange medium to flow into the first type of guide flow channel 100b1 along the first guide direction F1.

[0083] Along the first guiding direction F1, the flow cross-sectional area of ​​the first type of guiding channel 100b1 increases in a stepwise manner.

[0084] In this embodiment, the flow cross-sectional area of ​​the first type of guide channel 100b1 increases in a stepwise manner along the first guide direction F1, thereby making the flow rate at each point of the first type of guide channel 100b1 tend to be equal, improving the uniform cooling of the battery pack 10, further reducing the temperature difference of the cells 200 at different locations, and the flow inlet 100c1 flows into the first type of guide channel 100b1 along the first guide direction F1, and the flow cross-sectional area of ​​the guide channel 100b near the flow inlet is the smallest, and the flow rate of the heat exchange medium is the highest, which can quickly remove the heat at the flow inlet 100c1.

[0085] In some embodiments, the guide channel 100b includes a second type of guide channel 100b2, which defines a second guiding direction F2 for the heat exchange medium to pass through.

[0086] The flow channel 100c in this embodiment includes a flow channel outlet 100c2, which is used to supply the heat exchange medium to flow out of the second type of guide flow channel 100b2 along the second guide direction F2.

[0087] Among them, along the second guiding direction F2, the flow cross-sectional area of ​​the second type of guiding channel 100b2 decreases in a stepwise manner;

[0088] The first type of guide channel 100b1 and the second type of guide channel 100b2 are arranged opposite to each other, and the first guide direction F1 and the second guide direction F2 are opposite.

[0089] In this embodiment, along the second guiding direction F2, the flow cross-sectional area of ​​the second type of guiding channel 100b2 decreases in a stepwise manner. The flow cross-sectional area of ​​the guiding channel 100b near the flow outlet is the smallest, and the flow velocity of the heat exchange medium is the highest. This can accelerate the discharge of the high-temperature heat exchange medium, avoid blockage of the second type of guiding channel 100b2, and ensure the smooth flow of the second type of guiding channel 100b2.

[0090] Furthermore, in this embodiment of the application, the first type of guide channel 100b1 and the second type of guide channel 100b2 are arranged opposite to each other, and the first guide direction F1 and the second guide direction F2 are opposite (e.g., Figure 10 As shown, the heat exchange medium inlet 100c1 and outlet 100c2 are located on the same side, realizing the inflow and outflow of the heat exchange medium on the same side but with different guiding channels 100b. This reduces the volume occupied by the battery pack housing 100 and facilitates the arrangement of the battery pack 10.

[0091] In some embodiments, the battery pack housing 100 includes a first beam 110 and a second beam 120.

[0092] In this embodiment of the application, the first beam 110 is provided with a first groove structure 110a for defining a first type of guide channel 100b1, and the second beam 120 is provided with a second groove structure 120a for defining a second type of guide channel 100b2.

[0093] In some embodiments, reference Figure 2 The battery pack housing 100 also has: a bottom plane 130a.

[0094] In this design, the vertical distance between the wall surface of the first groove structure 110a near the bottom plane 130a and the bottom plane 130a is greater than the vertical distance between the wall surface of the second groove structure 120a near the bottom plane 130a and the bottom plane 130a. This allows the first groove structure 110a to be higher than the second groove structure 120a relative to the bottom plane 130a. In other words, the height of the first type of guide channel 100b1 is higher than the height of the second type of guide channel 100b2. This facilitates the circulation of the heat exchange medium after it has exchanged heat with the cells 200 of the battery pack 10, as the heat exchange medium flows from the first type of guide channel 100b1 through the batteries of the battery pack 10 to the second type of guide channel 100b2 under its own gravity.

[0095] For example, the first beam 110 and the second beam 120 are both longitudinal beams of the battery pack housing 100, and the two longitudinal beams are arranged opposite to each other.

[0096] For example, the distance between the second groove structure 120a and the bottom plane 130a of the box can be set to be greater than or equal to 10mm to prevent the overflow of glue during the application and fixing of the battery cell 200 from causing blockage or unevenness of the second type of guide channel.

[0097] In some embodiments, the vertical distance between the groove wall surface of the first groove structure 110a away from the bottom plane 130a and the bottom plane 130a is equal to the vertical distance between the battery cell 200 plane away from the bottom plane 130a. In this way, the flow rate entering the side of the battery cell 200 and the flow rate entering the top of the battery cell 200 can be balanced, further improving the uniform heat exchange of the battery cell 200, such as cooling or heating.

[0098] In some embodiments, the battery pack housing 100 further includes a base plate 130.

[0099] In this embodiment of the application, the base plate 130 is connected to the first beam 110 and the second beam 120 respectively;

[0100] The base plate 130 is located between the first beam 110 and the second beam 120.

[0101] In this embodiment of the application, the base plate 130 can serve as a support for the battery pack 10 cells 200.

[0102] In this embodiment, the battery pack housing 100 may also be without a base plate 130, which makes it easier to directly integrate the battery pack 10 into the vehicle body structure, thereby improving structural strength and space utilization.

[0103] The battery pack housing 100 in this embodiment further includes a third beam 140 and a fourth beam 150, both of which are constructed as crossbeams. The two crossbeams are arranged opposite each other and can connect two oppositely arranged longitudinal beams to enclose the internal space of the battery pack housing 100, which can accommodate the battery cells 200.

[0104] According to a second aspect of this application, a battery pack 10 is also provided, the battery pack 10 including the battery pack housing 100 as described above and battery cells 200, the battery cells 200 being housed within the housing space of the battery pack housing 100.

[0105] The battery pack 10 includes the battery pack housing 100 described above, and therefore has all the beneficial effects of the battery pack 10 described above. The embodiments of this application will not be repeated here.

[0106] In some embodiments, the battery pack 10 further includes a first type of barrier 310, a second type of barrier 320, and a third type of barrier 330.

[0107] In this embodiment, the first type of barrier 310 is located between two adjacent cells 200 in the first column, the second type of barrier 320 is located between two adjacent cells 200 in the second column, and the third type of barrier 330 is located between two adjacent cells 200 in the third column.

[0108] Among them, the contact area between the first type of barrier 310 and the battery cell 200 is greater than the contact area between the second type of barrier 320 and the battery cell 200, and the contact area between the second type of barrier 320 and the battery cell 200 is greater than the contact area between the third type of barrier 330 and the battery cell 200.

[0109] The three types of barrier elements described in this application embodiment can be adjusted according to the flow rate of the heat exchange medium required by different columns of battery cells 200. When the heat exchange medium flows through the first column of battery cells 200, its temperature is either low or high because it has not yet exchanged heat with the cells 200. As the heat exchange medium flows through the first column and then to the second column, it has already exchanged heat with the cells 200, causing its temperature to rise or fall. Finally, when it flows through the third column of battery cells 200, it has exchanged heat with both the first and second columns, further increasing its temperature. The contact area between the first type of barrier 310 and the battery cell 200 is increased or decreased, thus the contact area between the first type of barrier 310 and the battery cell 200 is greater than the contact area between the second type of barrier 320 and the battery cell 200, and the contact area between the second type of barrier 320 and the battery cell 200 is greater than the contact area between the third type of barrier 330 and the battery cell 200. This can sequentially increase the heat exchange area between the corresponding barrier and the battery cell 200. That is, even if the temperature of the heat exchange medium continuously increases or decreases as it flows through the first row of battery cells 200, the second row of battery cells 200, and the third row of battery cells 200, the contact area between the medium and the battery cell 200 decreases, the heat exchange area increases, and thus uniform heat exchange can be ensured for the battery cells 200 in different rows.

[0110] That is, when using a lower temperature liquid to cool the cells 200 in different rows of the battery pack 10, the contact area between the cell 200 closer to the channel outlet and the barrier is smaller, thus increasing the cooling area between the liquid and the cell 200. This ensures that even if the temperature of the lower temperature liquid rises to a certain extent, the larger cooling area between the liquid and the cell 200 still allows for better cooling of the cell 200, thereby achieving uniform cooling of the cells 200 in different rows.

[0111] In the embodiments of this application, the barrier components are all made of adhesive strips and are attached to the outer wall of the battery pack 10.

[0112] refer to Figure 4 From left to right, the battery cells 200 inside the battery pack housing 100 are arranged in the first column, the second column, and the third column, respectively.

[0113] In some embodiments, reference Figure 5 and Figure 6 The first type of barrier 310 includes: a first part 311 and a fourth part 312.

[0114] In this embodiment, the first part 311 is attached to the edge surface of the battery cell 200, and the size of the first part 311 along the first direction is the first size L1. In this embodiment, the fourth part 312 is attached to the central surface of the battery cell 200.

[0115] refer to Figure 7 and Figure 8 The second type of barrier 320 in this application embodiment includes a second part 321 and a fifth part 322. The second part 321 is attached to the edge surface of the battery cell 200, that is, attached to the edge surface of the battery cell 200 in the second row. The second part 321 has a second dimension L2 along the first direction. The fifth part 322 is attached to the central surface of the battery cell 200.

[0116] The third type of barrier 330 in this application embodiment includes a third part 331, which is attached to the edge surface of the battery cell 200, and the dimension of the third part 331 along the first direction is a third dimension L3.

[0117] Set the first dimension L1 to be greater than the second dimension L2, and the second dimension L2 to be greater than the third dimension L3.

[0118] refer to Figure 11 This allows the heat exchange medium to settle sequentially as it flows through the outer surface 210 of the battery cell 200, then flow out from the lower right corner of the battery cell 200 and into the second type of drainage channel, and finally flow out from the outlet 100c2 of the channel. This makes reasonable use of the heat exchange area between the heat exchange medium and the outer surface 210 of the battery cell 200, as well as the self-weight of the heat exchange medium itself, reducing the temperature unevenness caused by the temperature rise or fall of the heat exchange medium along the way.

[0119] For example, the shape of the first part 311 and the shape of the second part 321 can both be constructed as a U-shaped structure, while the shape of the third part 331 is constructed as a vertical strip.

[0120] For example, in the embodiments of this application, the first dimension L1 can be 90% to 95% of the height of the battery cell 200. When the height of the first type of barrier 310 is less than 90%, because it is close to the first type of guide channel 100b1, the temperature of the heat exchange medium that the battery cell 200 contacts is the lowest or highest, the flow rate is the fastest, and the heat exchange effect is excellent. Therefore, it is necessary to appropriately reduce the heat exchange area between the battery cell 200 and the heat exchange medium. When the height of the first dimension L1 exceeds 95%, the gap between the first type of barrier 310 and the top of the battery cell 200 is too small, which causes the heat exchange to be unable to flow through the battery cell 200. A large amount of heat exchange medium flows quickly through the top of the battery cell 200, resulting in poor heat exchange effect.

[0121] For example, in the embodiments of this application, the second dimension L2 of the second type of barrier 320 can be 60% to 75% of the height of the battery cell 200. The height within this range can ensure that the heat exchange area of ​​the battery cell 200 in the second row is greater than that of the battery cell 200 in the first row, while preventing the heat exchange area of ​​the battery cell 200 in the second row from being too large, which would cause the heat exchange of the battery cell 200 in the third row to deteriorate.

[0122] For example, refer to Figure 9 The third part 331 of the third type of barrier 330 adopts two vertical lines. The third dimension L3 of the third part 331 does not exceed 10mm. They are respectively attached to the lower left corner and the upper right corner of the cell 200. The height of the third part 331 is lower than the height of the second dimension L2 of the second type of barrier 320.

[0123] In this embodiment, the thicknesses of the first part 311, the second part 321, and the third part 331 are equal, which ensures that the gaps between adjacent cells 200 in each column are equal, thereby making the cells 200 of the battery pack 10 evenly distributed.

[0124] It should be noted that in the embodiments of this application, the two third parts 331 of the third type of barrier 330 are discontinuously attached to the two sides of the outer wall surface of the battery cell 200, and the height of the upper end of the third part 331 on the left is lower than the height of the upper end of the third part 331 on the right, and the lower end of the third part 331 on the right is higher than the second type of guide channel 100b2, so that the heat exchange medium can flow from top to bottom into the second type of guide channel 100b2.

[0125] For example, the thickness of the first part 311, the thickness of the second part 321, and the thickness of the third part 331 can all be set to 3 mm.

[0126] For example, the width of the first part 311 can be set to 10mm, the width of the second part 321 can be half the width of the first part 311, that is, 5mm, and the width of the third part 331 can be set to 5mm.

[0127] In this embodiment, the thickness of the fourth part 312 of the first type of barrier 310 is less than the thickness of the first part 311 of the first type of barrier 310, and the thickness of the fifth part 322 of the second type of barrier 320 is less than the thickness of the second part 321 of the second type of barrier 320. This allows both the first type of barrier 310 and the second type of barrier 320 to form a structure that is thin in the center and thick at the edges. The thin part in the center is in contact with the central part of the outer side surface 210 of the battery cell 200, and the thick part at the edges is in contact with the edge part of the outer side surface 210 of the battery cell 200. The upper part is open, allowing the heat exchange medium to enter the gap formed between the barrier and the battery cell 200, so that the heat exchange medium can exchange heat with the central part of the outer side surface 210 of the battery cell 200.

[0128] For example, the thickness of the fourth part 312 of the first type of barrier 310 can be set to be less than or equal to 50% of the thickness of the first part 311. That is, when the thickness of the first part 311 is set to 3mm, the thickness of the fourth part 312 can be 1.5mm, so that the heat exchange medium can exchange heat with the outer surface 210 of the cell 200.

[0129] For example, the thickness of the fifth part 322 of the second type of barrier 320 can be set to be less than or equal to 35% of the thickness of the second part 321 of the second type of barrier 320. That is, when the thickness of the second part 321 is set to 3mm, the thickness of the fifth part 322 can be less than or equal to 1.05mm.

[0130] It should be noted that the outer surface 210 of the battery cell 200 in this embodiment refers to the surface with the largest area of ​​the battery cell 200, and all three types of barrier components are attached to this surface with the largest area.

[0131] For example, the third type of barrier 330 does not contact the central portion of the outer side 210 of the battery cell 200, so that the heat exchange medium can directly contact the central portion of the outer side 210 of the battery cell 200, thereby improving the heat exchange effect.

[0132] In this embodiment, the bottoms of the first type of barrier 310, the second type of barrier 320, and the third type of barrier 330 are all flush with the bottom plane of the battery cell 200, which reduces the leakage of heat exchange medium from the bottom of the battery cell 200.

[0133] When the battery cell 200 expands cyclically, the central portion of the outer surface 210 of the first and second rows of battery cells 200 is in contact with the barrier, resulting in uniform stress on the entire core. The central portion of the outer surface 210 of the battery cell 200 does not require sufficient heat exchange, and even if it is completely compressed, it does not affect the flow channel above the barrier. However, the central portion of the outer surface 210 of the third row of battery cells 200 is not in contact with the barrier, and the displacement generated by the cyclic expansion of the battery cell 200 is less than the gap between two adjacent battery cells 200 in the third row. Therefore, it will not cause blockage of the gap between the outer surfaces 210 of two adjacent battery cells 200 in the third row. The gap flow channel is not limited by the expansion of the heat exchange medium and has no additional restrictions on the battery cell 200, thus not affecting the cycle life.

[0134] In some embodiments, reference Figure 3The battery pack housing 100 also includes a cover plate 400, which covers the interior space of the battery pack housing 100 and is sealed with sealing strips between the cover plate 400 and the first beam 110, the second beam 120, the third beam 140 and the fourth beam 150. A certain gap is provided between the cover plate 400 and the battery cell 200 to prevent short circuits and ensure electrical safety during assembly.

[0135] The first beam 110, the second beam 120, the third beam 140 and the fourth beam 150 in the embodiments of this application can be integrally formed.

[0136] In some embodiments, the battery pack housing 100 may further include a fifth beam 160, which is disposed in the internal space of the housing and divides the internal space 100a into two areas, one area for placing the battery cells 200 and the other area for placing electrical components.

[0137] For example, the electrical components can be constructed as explosion-proof valves, and the internal space 100a can be properly vented. The fifth beam 160 can also serve as heat insulation, simplifying the structure of the battery pack.

[0138] In this embodiment, an epoxy board can be attached to the side of the battery cell 200 for insulation protection and side flow channel sealing.

[0139] In summary, in this embodiment of the application, by setting different flow cross-sectional areas of the guide channel 100b, setting different heights of the guide channel 100b, and differentiating the three types of barrier components, temperature uniformity can still be guaranteed even when the battery cell 200 is fully immersed.

[0140] Furthermore, groove structures are opened on the first beam 110 and the second beam 120, and a barrier is set on the outer side 210 of the battery cell 200. The sedimentation flow of the heat exchange medium, which enters from the upper left and exits from the lower right, can make full use of the outer side 210 of the battery cell 200 and its own weight, avoiding blockage of the outer side 210 of the battery cell 200 during circulation and blockage of holes during assembly, ultimately achieving more uniform heat exchange performance.

[0141] The battery pack 10 in this embodiment can be applied to vehicles.

[0142] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0143] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0144] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0145] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack housing (100), characterized in that, The battery pack housing (100) has: A guide channel (100b) is used to define a guiding direction for the heat exchange medium to pass through; and The flow channel (100c) is used to allow the heat exchange medium to pass through in the guiding direction; The flow channel (100c) is connected to the guide flow channel (100b); Wherein, the flow cross-sectional area of ​​the guide channel (100b) near the channel opening (100c) is smaller than the flow cross-sectional area of ​​the guide channel (100b) away from the channel opening (100c).

2. The battery pack housing (100) according to claim 1, characterized in that, The guide channel (100b) includes: The first type of guide channel (100b1) defines a first guiding direction (F1) for the heat exchange medium to pass through; The flow channel (100c) includes: The flow channel inlet (100c1) is used to allow the heat exchange medium to flow into the first type of guide flow channel (100b1) along the first guide direction (F1); Along the first guiding direction (F1), the flow cross-sectional area of ​​the first type of guiding channel (100b1) increases in a stepwise manner.

3. The battery pack housing (100) according to claim 2, characterized in that, The guide channel (100b) includes: The second type of guide channel (100b2) defines a second guiding direction (F2) for the heat exchange medium to pass through; The flow channel (100c) includes: The flow channel outlet (100c2) is used to allow the heat exchange medium to flow out of the second type of guide flow channel (100b2) along the second guide direction (F2); Along the second guiding direction (F2), the flow cross-sectional area of ​​the second type of guiding channel (100b2) decreases in a stepwise manner. The first type of guide channel (100b1) and the second type of guide channel (100b2) are arranged opposite to each other, and the first guide direction (F1) and the second guide direction (F2) are opposite.

4. The battery pack housing (100) according to claim 3, characterized in that, The battery pack housing (100) includes: The first beam (110) is provided with a first groove structure (110a) for defining the first type of guide channel (100b1); The second beam (120) is provided with a second groove structure (120a) for defining the second type of guide channel (100b2); The battery pack housing (100) also has: a bottom plane (130a); The first beam (110) and the second beam (120) are arranged opposite to each other. The vertical distance between the groove wall surface of the first groove structure (110a) near the bottom plane (130a) and the bottom plane (130a) is greater than the vertical distance between the groove wall surface of the second groove structure (120a) near the bottom plane (130a) and the bottom plane (130a).

5. The battery pack housing (100) according to claim 4, characterized in that, The vertical distance between the groove wall surface of the first groove structure (110a) away from the bottom plane (130a) and the bottom plane (130a) is equal to the vertical distance between the battery cell (200) plane away from the bottom plane (130a).

6. The battery pack housing (100) according to claim 4, characterized in that, The battery pack housing (100) also includes: The base plate (130) is connected to the first beam (110) and the second beam (120) respectively; The base plate (130) is located between the first beam (110) and the second beam (120).

7. A battery pack (10), characterized in that, The battery pack (10) includes a battery pack housing (100) as described in any one of claims 1 to 6 and battery cells (200), the battery cells (200) being housed within the housing space of the battery pack housing (100).

8. The battery pack (10) according to claim 7, characterized in that, The battery pack (10) also includes: A first type of barrier (310) is located between two adjacent cells (200) in the first column; A second type of barrier (320) is located between two adjacent cells (200) in the second column; and The third type of barrier (330) is located between two adjacent cells (200) in the third column; The contact area between the first type of barrier (310) and the battery cell (200) is greater than the contact area between the second type of barrier (320) and the battery cell (200), and the contact area between the second type of barrier (320) and the battery cell (200) is greater than the contact area between the third type of barrier (330) and the battery cell (200).

9. The battery pack (10) according to claim 8, characterized in that, The first type of barrier (310) includes: The first part (311) is attached to the edge surface of the battery cell (200), and the dimension of the first part (311) along the first direction is the first dimension (L1); The second type of barrier (320) includes: The second part (321) is attached to the edge surface of the battery cell (200), and the dimension of the second part (321) along the first direction is the second dimension (L2); and The third type of barrier (330) includes: The third part (331) is attached to the edge surface of the battery cell (200), and the dimension of the third part (331) along the first direction is the third dimension (L3); Wherein, the first dimension (L1) is larger than the second dimension (L2), and the second dimension (L2) is larger than the third dimension (L3); the thickness of the first part (311), the thickness of the second part (321), and the thickness of the third part (331) are equal.

10. The battery pack (10) according to claim 9, characterized in that, The first type of barrier (310) includes: The fourth part (312) is attached to the central surface of the battery cell (200); The second type of barrier (320) includes: The fifth part (322) is attached to the central surface of the battery cell (200); The thickness of the fourth part (312) is less than the thickness of the first part (311), and the thickness of the fifth part (322) is less than the thickness of the second part (321).

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