Battery box, battery pack and automobile

Abstract

The utility model discloses a battery box, a battery pack and an automobile, the battery box comprises a box body, the box body is provided with a liquid cooling part at the bottom of a box bottom plate, and the liquid cooling part comprises at least one flow channel area; the runner region communicated with the interface of the box bottom plate is an end runner region; a plurality of first ribs extending in the first direction are arranged in the end runner area, the first ribs are arranged in the second direction, and a cooling runner is formed between every two adjacent first ribs; the connector is located on one side of the end runner area in the first direction, and the first rib is provided with a connector end close to the connector. In any two first ribs of at least one end runner area, the distance between the connector end of the first rib close to the connector and the connector in the first direction is a first distance, the distance between the connector end of the first rib away from the connector and the connector in the first direction is a second distance, and the first distance is smaller than the second distance. By optimizing the structure of the liquid cooling part of the battery box, the distribution uniformity of the cooling medium in each cooling flow channel of the liquid cooling part can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a battery box, a battery pack and a vehicle. BACKGROUND

[0002] The power assembly of a new energy vehicle includes a power battery system, which is also referred to as a battery pack and mainly includes a battery box, a battery cell, a thermal management system, an electrical system and other accessories. Among them, the battery cell is installed in the battery box, and the battery box is integrated with a liquid cooling structure to cool the battery cell through the liquid cooling structure.

[0003] The liquid cooling structure is generally a liquid cooling plate, which has a plurality of flow channels for liquid cooling medium to flow through. The liquid cooling plate has an inlet at one end and an outlet at the other end. The liquid cooling medium flows into each flow channel from the inlet and flows out of the outlet after flowing through each flow channel, so as to realize cooling of the battery cell. In actual installation, the distance between the inlet of the liquid cooling plate and the inlet end of each flow channel is different, so that the distribution of the liquid cooling medium in each flow channel is uneven, resulting in different cooling effects on different parts of the battery cell.

[0004] Therefore, how to reasonably design the liquid cooling flow channel to make the flow distribution in each flow channel as uniform as possible is a technical problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a battery box, a battery pack and a vehicle. By optimizing the structure of the liquid cooling part of the battery box, the uniformity of the distribution of the cooling medium in each cooling flow channel of the liquid cooling part can be improved.

[0006] To solve the above technical problems, the present application provides a battery box, which comprises a box body, the box body comprises a box bottom plate, the bottom of the box bottom plate is provided with a liquid cooling part, the liquid cooling part comprises at least one flow channel area; the box bottom plate has an interface, and the flow channel area communicating with the interface is an end flow channel area;

[0007] A plurality of first ribs extending in a first direction are arranged in the end flow channel area, and the plurality of first ribs are arranged in a second direction, and a cooling flow channel is formed between adjacent two first ribs;

[0008] The interface is located on one side of the end flow channel area in the first direction, and the first rib has an interface end close to the interface;

[0009] In any two of the first ribs of at least one of the end flow channel regions, a first distance between an interface end of the first rib close to the interface and the interface in the first direction is less than a second distance between an interface end of the first rib away from the interface and the interface in the first direction.

[0010] In an implementable solution, the liquid cooling part comprises at least two flow channel regions, two adjacent flow channel regions are an upstream flow channel region and a downstream flow channel region respectively, the upstream flow channel region and the downstream flow channel region are arranged in a second direction, and a boundary rib is arranged between the upstream flow channel region and the downstream flow channel region; a liquid outlet end of the upstream flow channel region is in communication with a liquid inlet end of the downstream flow channel region, and in the first direction, the liquid outlet end of the upstream flow channel region and the liquid inlet end of the downstream flow channel region are located on the same side.

[0011] The downstream flow channel region comprises a boundary rib at the liquid inlet end thereof, and the boundary rib extends in the second direction; a plurality of second ribs extending in the first direction are arranged in the downstream flow channel region, the plurality of second ribs are arranged in the second direction, and a cooling flow channel is formed between two adjacent second ribs.

[0012] In any two of the second ribs of at least one of the downstream flow channel regions, a third distance between an inlet end of the second rib close to the boundary rib and the boundary rib in the first direction is greater than a fourth distance between an inlet end of the second rib away from the boundary rib and the boundary rib in the first direction; wherein the inlet end of the second rib is an end of the second rib close to the liquid inlet end of the downstream flow channel region.

[0013] In an implementable solution, the box body is an integrally formed structure, the liquid cooling part comprises a plurality of ribs, the ribs are fixedly arranged on a bottom wall of the box bottom plate, and the ribs are integrally formed with the box body.

[0014] In an implementable solution, the battery box comprises a bottom sealing plate, and the bottom sealing plate is fixedly connected with the ribs.

[0015] In an implementable solution, the bottom sealing plate and the ribs are fixedly connected by welding or gluing.

[0016] In an implementable solution, the bottom wall of the box bottom plate is provided with a mounting structure, and among the plurality of ribs, a rib adjacent to the mounting structure has an avoiding section avoiding the connecting structure.

[0017] In an implementation, the battery box comprises a bottom guard plate, the liquid cooling part is located between the bottom guard plate and the box bottom plate, a plurality of support columns are arranged between the bottom guard plate and the box bottom plate, one end of the support column is fixedly connected with the bottom guard plate, and the other end of the support column is fixedly connected with the box bottom plate; the mounting structure comprises a mounting portion for connecting the support column.

[0018] In an implementation, the bottom of the box bottom plate is provided with a flow channel avoiding area, and part of the plurality of ribs are partition ribs for partitioning the flow channel avoiding area.

[0019] In an implementation, the box body is fixedly connected with an external connecting pipe, the battery box comprises a channel portion, one end of the channel portion is in communication with the external connecting pipe, and the other end of the channel portion is in communication with the interface; the channel portion and the box body are in an integral molding structure.

[0020] The application also provides a battery pack comprising a battery cell assembly and a battery box, wherein the battery box is any one of the battery boxes described above, and the battery cell assembly is accommodated in the box body.

[0021] The application also provides an automobile comprising a vehicle frame, wherein the vehicle frame is provided with the battery box described above, or the vehicle frame is provided with the battery pack described above.

[0022] The battery box provided by the application is applied to a vehicle and can be used as a box body of a battery pack of the vehicle; the bottom of the box bottom plate of the battery box is provided with a liquid cooling part, the flow channel area of the liquid cooling part comprises an end flow channel area in communication with the interface of the box bottom plate, the first rib for forming the cooling flow channel is arranged in the end flow channel area, and the distance between the interface end of the first rib relatively close to the interface and the interface and the distance between the interface section of the first rib relatively far from the interface and the interface are arranged to be smaller and larger in the extension direction of the first rib, so that the flow resistance of each cooling flow channel in the end flow channel area can be balanced, and the uniformity of the distribution of the cooling medium in each cooling flow channel can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 An exploded view of the battery box in an embodiment provided by the application;

[0024] Figure 2 A structural schematic view of the box body in an embodiment provided by the application; Figure 1

[0025] A structural schematic view of the box body in an embodiment provided by the application; Figure 3 Figure 1 A structural schematic view of the box body in an embodiment provided by the application;

[0026] Figure 4 A structural schematic view of the box body in an embodiment provided by the application;​Figure 3 Partial structure diagram of the middle box body near the liquid outlet interface area;

[0027] Figure 5 For Figure 3 Partial enlarged view of the middle I part;

[0028] Figure 6 For Figure 2 Partial structure diagram of the middle box body near the front side plate area.

[0029] Explanation of reference signs:

[0030] Box body 10, first containing cavity 101, second containing cavity 102, flow passage avoiding area 103, box bottom plate 11, mounting part 111, reinforcing rib 112, front side plate 121, rear side plate 122, left side plate 123, right side plate 124, first partition plate 1251, second partition plate 1252;

[0031] Liquid inlet passage part 20A, liquid inlet interface 201A, liquid outlet passage part 20B, liquid outlet interface 201B;

[0032] Cooling flow passage 301, rib 31, flow passage rib 31A, first rib 311A, second rib 312A, boundary rib 313A, partition rib 31B, boundary rib 311B, avoiding section 3101, bottom sealing plate 32, through hole 321;

[0033] Liquid inlet connecting pipe 41, liquid outlet connecting pipe 42, first mounting boss 51, second mounting boss 52;

[0034] Supporting column 60, bottom guard plate 70, connecting part 71, temperature sampling component 80, insulation layer 90;

[0035] First flow passage area 1S, second flow passage area 2S, third flow passage area 3S, fourth flow passage area 4S. DETAILED DESCRIPTION

[0036] In order to make the person skilled in the art better understand the scheme of the present application, the present application will be further described in detail below in combination with the drawings and specific embodiments.

[0037] Without losing generality, the present embodiment takes the battery box with a generally rectangular cuboid outer contour as the description subject, and the specific implementation scheme is described in detail. It should be understood that the outer contour of the battery box and the size proportion relationship of the drawings do not constitute a substantial limitation on the battery box claimed by the present application.

[0038] The ordinal numbers such as first, second, etc. used in the present text are used to distinguish different parts with the same name, and do not represent a specific order or primary and secondary relationship, etc.

[0039] For the convenience of understanding and description, three directions are defined for the battery box in this paper: the x-axis direction is the length direction of the battery box, the y-axis direction is the width direction of the battery box, and the z-axis direction is the thickness direction of the battery box, which can also be understood as the height direction of the battery box. The front-rear direction in this paper is the x-axis direction, the left-right direction is the y-axis direction, and the up-down direction (or top-bottom direction) is the z-axis direction. The use of the orientation words is only for the purpose of describing the technical solution clearly and conveniently, and does not constitute a limitation on the protection scope.

[0040] Please refer to Figure 1 and Figure 2 , Figure 1 An exploded view of the battery box provided in an embodiment of the present application is shown in Figure 2 An exploded view of the battery box provided in an embodiment of the present application is shown in Figure 1 An exploded view of the battery box provided in an embodiment of the present application is shown in

[0041] The battery box provided in the embodiment can be used in a vehicle, and the battery box includes a box body 10 which can be used to accommodate a battery cell assembly. The box body 10 includes a box bottom plate 11, and the bottom of the box bottom plate 11 is provided with a liquid cooling portion which can be used to dissipate heat from the battery cell assembly.

[0042] The box body 10 further includes a box side plate fixed to the outer periphery of the box bottom plate 11. The box side plate and the box bottom plate 11 can be arranged to form an open accommodating space, which can be used to mount the battery cell assembly and other accessories such as a battery pack circuit breaking unit. The battery box further includes a cover plate (not shown in the figure) which is detachably connected to the box body 10 and is used to block the aforementioned accommodating space so that the battery cell assembly and other structures are located in a relatively closed space.

[0043] In the illustrated example, the box side plate of the box body 10 includes a front side plate 121, a rear side plate 122, a left side plate 123, and a right side plate 124. The front side plate 121 and the rear side plate 122 are arranged in the x-axis direction, and the left side plate 123 and the right side plate 124 are arranged in the y-axis direction.

[0044] In the illustrated example, the box body 10 further includes a first partition plate 1251 and a second partition plate 1252. The first partition plate 1251 and the second partition plate 1252 are arranged in the x-axis direction. The first partition plate 1251 and the second partition plate 1252 both extend along the y-axis direction, and the two ends of the two partition plates respectively abut against the left side plate 123 and the right side plate 124. In this way, a first accommodating cavity 101 is formed between the first partition plate 1251 and the second partition plate 1252, and another first accommodating cavity 101 is formed between the second partition plate 1252 and the rear side plate 122. Both of the first accommodating cavities 101 are used to accommodate battery cell assemblies (not shown in the figure). At the same time, a second accommodating cavity 102 is formed between the first partition plate 1251 and the front side plate 121, and the second accommodating cavity 102 can be used to mount accessories such as a battery pack circuit breaking unit.

[0045] In other embodiments, the number, arrangement, etc. of the partitions of the box body 10 can be in other forms to form different numbers, different arrangements of the first accommodating cavities 101 or the second accommodating cavities 102, which can be adjusted according to application needs.

[0046] Please refer to Figures 3 to 5 , Figure 3 in Figure 3 for Figure 1 in Figure 4 for Figure 3 in Figure 5 for Figure 3 in

[0047] The liquid cooling part provided at the bottom of the battery box bottom plate 11 can include at least one flow channel area, which can be provided with a plurality of cooling flow channels 301. The cooling medium entering the liquid cooling part can flow through the cooling flow channels 301 of each flow channel area and then flow out of the liquid cooling part.

[0048] To reasonably utilize space and ensure heat dissipation effect, the liquid cooling part usually has two or more than two flow channel areas arranged side by side. These flow channel areas can be connected in series, so that the flow path of the cooling medium in the liquid cooling part is in the shape of U, S or snake. Of course, the liquid cooling part can also be provided with only one flow channel area.

[0049] The specific structure and arrangement of the flow channel area of the liquid cooling part will be described below with reference to the example shown in Figure 3 . In the example shown in Figure 3 , the liquid cooling part includes four flow channel areas, namely a first flow channel area 1S, a second flow channel area 2S, a third flow channel area 3S and a fourth flow channel area 4S. Each flow channel area includes a plurality of flow channel ribs 31A extending in a first direction, and a plurality of flow channel ribs 31A are arranged in a second direction, and a cooling flow channel 301 is formed between adjacent two flow channel ribs 31A. It can be understood that the four flow channel areas are arranged in the second direction. The liquid cooling part further includes a partition rib 31B, which is a rib defining the range of the flow channel area of the liquid cooling part.

[0050] Figure 3 In the example shown in , the first direction in which the flow channel ribs 31A extend is the x-axis direction, the second direction in which the plurality of flow channel ribs 31A are arranged is the y-axis direction, and the four flow channel areas are arranged along the y-axis direction.

[0051] It should be noted that the extension direction and arrangement direction of the flow channel ribs 31A of the flow channel area of the liquid cooling part can also be other directions, which are not limited to those shown in the figures. For example, the flow channel ribs 31A can also extend along the y-axis direction, and at this time, the plurality of flow channel ribs 31A can be arranged along the x-axis direction.

[0052] The four flow channels of the liquid cooling section are connected in series. For two adjacent flow channels, the liquid outlet of one flow channel is connected to the liquid inlet of the other flow channel, and the liquid outlet of one flow channel and the liquid inlet of the other flow channel are on the same side in the first direction. Adjacent flow channels are separated by a dividing rib 313A, which is also a flow channel rib 31A, and forms a cooling flow channel 301 with other adjacent flow channel ribs 31A.

[0053] The bottom plate 11 has a liquid inlet 201A communicating with the first flow channel region 1S, and a liquid outlet 201B communicating with the fourth flow channel region 4S. The liquid inlet 201A and the liquid outlet 201B are on the same side in the first direction x. Figure 3 As shown, the liquid inlet 201A and the liquid outlet 201B are located on the front side of the bottom plate 11 (the side closest to the front side plate 121). In this way, after the cooling medium flows into the first flow channel 1S from the liquid inlet 201A, it can flow sequentially through the first flow channel 1S, the second flow channel 2S, the third flow channel 3S, and the fourth flow channel 4S before flowing out from the liquid outlet 201B.

[0054] For ease of description, the flow channel area with liquid inlet 201A or liquid outlet 201B is defined as the end flow channel area. Two flow channel areas arranged side by side and adjacent to each other are defined as the upstream flow channel area and the downstream flow channel area, respectively. The upstream and downstream are defined based on the flow direction of the cooling medium.

[0055] for Figure 3 In the example of the liquid cooling section, the first flow channel region 1S has a liquid inlet interface 201A and the fourth flow channel region 4S has a liquid outlet interface 201B, both of which belong to the end flow channel region.

[0056] for Figure 3 In the example of the liquid cooling section, the liquid cooling section has a total of three sets of adjacent upstream and downstream flow channel regions. The first flow channel region 1S and the second flow channel region 2S are in the first group, with the first flow channel region 1S being the upstream flow channel region of the second flow channel region 2S and the second flow channel region 2S being the downstream flow channel region of the first flow channel region 1S. The second flow channel region 2S and the third flow channel region 3S are in the second group, with the second flow channel region 2S being the upstream flow channel region of the third flow channel region 3S and the third flow channel region 3S being the downstream flow channel region of the second flow channel region 2S. The third flow channel region 3S and the fourth flow channel region 4S are in the third group, with the third flow channel region 3S being the upstream flow channel region of the fourth flow channel region 4S and the fourth flow channel region 4S being the downstream flow channel region of the third flow channel region 3S.

[0057] It is understandable that the upstream and downstream flow channel regions are relative concepts; the same flow channel region may be the upstream or downstream flow channel region.

[0058] For convenience of description, the flow channel rib 31A in the end flow channel area is referred to as a first rib 311A, the first rib 311A does not include the boundary rib 313A dividing different flow channel areas, and does not include the partition rib 31B. An end of the first rib 311A close to the interface (the liquid inlet interface 201A or the liquid outlet interface 201B) is referred to as an interface end.

[0059] In the embodiment, in at least one end flow channel area of the liquid cooling part, the distance between the interface end of the first rib 311A close to the interface and the interface in the first direction is a first distance, and the distance between the interface end of the first rib 311A away from the interface and the interface in the first direction is a second distance, the first distance is less than the second distance.

[0060] The above setting mode is advantageous to improve the uniformity of the distribution of the cooling medium in each cooling flow channel 301 in the end flow channel area.

[0061] In combination with Figure 3 and Figure 4 , the specific setting mode of the first rib 311A in the end flow channel area is described in detail taking the end flow channel area as the fourth flow channel area 4S as an example.

[0062] For example, three first ribs 311A are arranged in the fourth flow channel area 4S, the liquid outlet interface 201B is located on the front side of the fourth flow channel area 4S in the first direction (the front-back direction, the x-axis direction), and the front end of the first rib 311A close to the liquid outlet interface 201B is the interface end.

[0063] For example, the liquid outlet interface 201B is arranged on the right end in the second direction (the left-right direction, the y-axis direction), along the direction from right to left, the distance between the interface end of the first first rib 311A and the liquid outlet interface 201B in the second direction is d1, the distance between the interface end of the second first rib 311A and the liquid outlet interface 201B in the second direction is d2, and the distance between the interface end of the third first rib 311A and the liquid outlet interface 201B in the second direction is d3.

[0064] For the first first rib 311A and the second first rib 311A, the first first rib 311A is the rib close to the liquid outlet interface 201B in the second direction, the distance d1 is the first distance, the second first rib 311A is the rib away from the liquid outlet interface 201B in the second direction, the distance d2 is the second distance, and the distance d1 is less than the distance d2 when arranged. It can be understood that, in the first direction, the interface end of the first first rib 311A is located on the front side of the interface end of the second first rib 311A.

[0065] For the second first rib 311A and the third first rib 311A, the second first rib 311A is the rib close to the liquid outlet interface 201B in the second direction, the distance d2 is the first distance, and the third first rib 311A is the rib away from the liquid outlet interface 201B in the second direction, and the distance d3 is the second distance. When arranged, the distance d2 is less than the distance d3. It can be understood that, in the first direction, the interface end of the second first rib 311A is located in front of the interface end of the third first rib 311A.

[0066] In specific implementations, the specific difference between the distances d1, d2, and d3 can be determined through experiments or simulations.

[0067] It should be understood that the first distance and the second distance are also a relative concept. For the same first rib 311A, the distance between the interface end of the first rib 311A and the liquid outlet interface 201B in the second direction can be the first distance or the second distance, depending on the object rib compared to the first rib 311A.

[0068] In the fourth flow channel area 4S, the direction in which the cooling medium flows along the cooling flow channel 301 is from back to front. In combination with the above-mentioned arrangement of the first rib 311A in the fourth flow channel area 4S, the flow resistance of the cooling flow channel away from the liquid outlet interface 201B is reduced, and the cooling medium in the cooling flow channel away from the liquid outlet interface 201B can more easily flow to the liquid outlet interface 201B, thereby facilitating the uniformity of the distribution of the cooling medium in the cooling flow channel 301 in the fourth flow channel area 4S. Figure 3 Figure 4 It can be understood that, in the second direction, the cooling flow channel away from the liquid outlet interface 201B has a longer flow path, and the cooling flow channel close to the liquid outlet interface 201B has a shorter flow path. After the first rib 311A in the fourth flow channel area 4S is arranged as described above, the flow resistance of the cooling flow channel away from the liquid outlet interface 201B is reduced, and the cooling medium in the cooling flow channel away from the liquid outlet interface 201B can more easily flow to the liquid outlet interface 201B, thereby facilitating the uniformity of the distribution of the cooling medium in the cooling flow channel 301 in the fourth flow channel area 4S.

[0069] Figure 3 In the illustrated example, the first rib 311A in the first flow channel area 1S of the liquid cooling part is also arranged in the above-mentioned manner. The cooling medium flowing from the liquid inlet interface 201A more easily flows to the cooling flow channel 301 close to the liquid inlet interface 201A. After the first rib 311A in the first flow channel area 1S is arranged in the above-mentioned manner, the flow resistance of the cooling flow channel 301 away from the liquid inlet interface 201A is reduced, and the cooling medium flowing in can more easily flow into the cooling flow channel 301 away from the liquid inlet interface 201A, thereby facilitating the uniformity of the distribution of the cooling medium in the cooling flow channel 301 in the first flow channel area 1S.

[0070] In the present embodiment, the structure of the downstream flow channel area in at least one set of adjacent upstream flow channel areas and downstream flow channel areas of the liquid cooling part can also be optimized to facilitate the uniformity of the distribution of the cooling medium in the downstream flow channel area.​

[0071] For the convenience of description, the flow channel ribs 31 A in the downstream-side flow channel region are referred to as second ribs 312A, which do not include the boundary ribs 313A that divide different flow channel regions, nor the partition ribs 31 B. An end of the second ribs 312A close to the liquid inlet end of the downstream-side flow channel region is referred to as the inlet end of the second ribs 312A. The downstream-side flow channel region also includes a boundary rib 311 B at the liquid inlet end thereof, which extends along the second direction. It can be understood that the boundary rib 311 B is part of the partition ribs 31 B of the flow channel region of the liquid cooling portion, and is used to define the range of the downstream-side flow channel region.

[0072] In at least one downstream-side flow channel region, the distance between the inlet end of the second rib 312A close to the boundary rib 313A and the boundary rib 311 B in the first direction is defined as a third distance, and the distance between the inlet end of the second rib 312A away from the boundary rib 313A and the boundary rib 311 B in the first direction is defined as a fourth distance, the third distance being greater than the fourth distance.

[0073] The above arrangement is conducive to improving the uniformity of the distribution of the cooling medium in each cooling flow channel 301 in the downstream-side flow channel region.

[0074] In combination with Figure 3 and Figure 5 the specific arrangement of the second ribs 312A in the downstream-side flow channel region is described in detail below, taking the second flow channel region 2S and the third flow channel region 3S as an example of a group of adjacent upstream-side flow channel regions and downstream-side flow channel regions.

[0075] At this time, the second flow channel region 2S is an upstream-side flow channel region, and the third flow channel region 3S is a downstream-side flow channel region. The liquid outlet end of the second flow channel region 2S is located at the front side, and the liquid inlet end of the third flow channel region 3S is also located at the front side, on the same side as the liquid outlet end of the second flow channel region 2S and in communication with the liquid outlet end of the second flow channel region 2S. After the cooling medium in the second flow channel region 2S flows forward and out of the liquid outlet end, it turns and flows into the third flow channel region 3S.

[0076] For example, the third flow channel region 3S is provided with four second ribs 312A. According to the foregoing arrangement, the front end of the second rib 312A is its inlet end. In the direction from right to left, the distance between the inlet end of the second rib 312A and the boundary rib 311 B in the first direction gradually decreases.

[0077] Figure 5Two second ribs 312A are exemplarily marked with the distance from the boundary rib 311B in the first direction, from right to left, in the third flow channel area 3S, the distance from the inlet end of the first second rib 312A to the boundary rib 311B in the first direction is d4, and the distance from the inlet end of the second second rib 312A to the boundary rib 311B in the first direction is d5, according to the foregoing setting, the distance d4 is the third distance, the distance d5 is the fourth distance, and the distance d4 is greater than the distance d5. The distance between the inlet end of the other second ribs 312A and the boundary rib 311B in the first direction is not exemplarily described one by one.

[0078] It should be understood that the third distance and the fourth distance are also a relative concept.

[0079] The cooling medium flows into the third flow channel area 3S from the liquid outlet end of the second flow channel area 2S after a turning of about 180 degrees. It is found through research that during the turning flow of the cooling medium, the cooling medium has a tendency to have a larger flow rate away from the second flow channel area 2S and a smaller flow rate close to the second flow channel area 2S. The second ribs 312A of the third flow channel area 3S are provided as described above, which can increase the flow resistance of the cooling flow channel 301 away from the side of the second flow channel area 2S in the third flow channel area 3S, thereby facilitating to improve the uniformity of the distribution of the cooling medium in each cooling flow channel 301 in the third flow channel area 3S.

[0080] In a specific implementation, the distance between the inlet end of each second rib 312A in the third flow channel area 3S and the boundary rib 311B of the third flow channel area 3S can be determined through test or simulation.

[0081] In combination Figure 3 In the embodiment, for the adjacent first flow channel area 1S and second flow channel area 2S, the second ribs 312A in the second flow channel area 2S on the downstream side are also provided at the liquid inlet end as described above, which can be understood by referring to the setting of the liquid inlet end of the third flow channel area 3S and will not be described in detail.

[0082] In a specific application example, through the above setting of the flow channel area of the liquid cooling part, the flow deviation of each cooling flow channel 301 can be controlled within 15%, the uniformity of the flow of the cooling medium distributed in each cooling flow channel 301 of the liquid cooling part is good, which is conducive to improving the heat dissipation effect of the battery assembly.

[0083] It should be noted that for the third flow channel area 3S and the fourth flow channel area 4S, the fourth flow channel area 4S is also a downstream flow channel area, and the fourth flow channel area 4S is also an end flow channel area. In actual setting, it can be selected to be set only according to the setting mode of the aforementioned end flow channel area, or it can be selected to be set only according to the setting mode of the aforementioned downstream flow channel area, or it can be set according to the setting mode of the end flow channel area and the downstream flow channel area.Figure 3 The fourth flow channel region 4S is only set according to the setting mode of the end flow channel region.

[0084] In some other embodiments, the liquid cooling part can have only one flow channel region, which has a liquid inlet and a liquid outlet, and is the aforementioned end flow channel region. Since the liquid cooling part has only one flow channel region, there is no upstream flow channel region and no downstream flow channel region.

[0085] In some other embodiments, the liquid cooling part can have only two flow channel regions arranged side by side. One of the two flow channel regions has a liquid inlet, and the other has a liquid outlet. Both of the two flow channel regions belong to the end flow channel region, and at least one of the two flow channel regions can be set according to the setting mode of the aforementioned end flow channel region. One of the two flow channel regions is also the downstream flow channel region, which can also be set according to the setting mode of the aforementioned downstream flow channel region.

[0086] In this embodiment, the box body 10 of the battery box is a one-piece structure. The liquid cooling part includes a plurality of ribs 31, which include the aforementioned flow channel ribs 31A and the aforementioned partition ribs 31B. The plurality of ribs 31 of the liquid cooling part are fixedly arranged on the bottom wall of the bottom plate 11 and are integrally formed with the box body 10. That is, the plurality of ribs 31 and the box body 10 are a one-piece structure. In this way, the number of parts of the battery box can be reduced, and the assembly complexity can be reduced.

[0087] In a specific implementation, the box body 10 and the ribs 31 of the liquid cooling part are formed by one-piece die casting. In this way, the structural form of the ribs 31 of the liquid cooling part can be flexibly designed, and the flow channel regions of the liquid cooling part can be flexibly arranged as needed, which is also conducive to improving the structural strength and rigidity of the battery box as a whole.

[0088] Referring again to Figure 1 , the battery box further includes a bottom sealing plate 32, which is fixedly connected with the ribs 31 to seal the cooling flow channels 301 of the liquid cooling part.

[0089] The fixed connection between the bottom sealing plate 32 and the ribs 31 can be achieved by friction stir welding, which has good sealing performance and firmness. Of course, other welding methods such as brazing or laser welding can also be used, and adhesive bonding can also be used.

[0090] In a specific implementation, the battery box further includes a bottom guard plate 70, which is located below the bottom sealing plate 32 and is fixedly connected with the box body 10. The bottom guard plate 70 can play a protective role, for example, to prevent the bottom sealing plate 32 from being broken due to impact or impact of flying objects such as stones.

[0091] The outer periphery of the bottom guard plate 70 can be fixedly connected with the box body 10, and can be fixed by means of bolts, rivets or adhesives.

[0092] The bottom guard plate 70 and the bottom of the box body 10 can also be fixedly connected by a plurality of support columns 60 to improve the reliability and stability of the connection between the bottom guard plate 70 and the box body 10.

[0093] In the illustrated example, the box body 10 and the bottom guard plate 70 are provided with a plurality of support columns 60 in the middle region in the x-axis direction along the y-axis direction, and a plurality of support columns 60 are provided in the region close to the front side plate 121. In other implementations, the number, arrangement position and arrangement mode of the support columns 60 can be adjusted to achieve stable connection of the box body 10 and the bottom guard plate 70.

[0094] The bottom guard plate 70 is provided with a connecting portion 71 to facilitate fixed connection with one end of the support column 60 through the connecting portion 71. The support column 60 and the bottom guard plate 70 can be fixed by means of screwing, welding or adhesion. The other end of the support column 60 is fixedly connected with the bottom plate 11 of the box body 10 after passing through the bottom sealing plate 32. The bottom plate 11 of the box body 10 is provided with a mounting portion 111 for mounting the support column 60. The fixed connection between the support column 60 and the bottom plate 11 of the box body 10 can be achieved by means of riveting, welding or adhesion.

[0095] The bottom sealing plate 32 is provided with a through hole 321 for the support column 60 to pass through. The support column 60 and the bottom sealing plate 32 are sealed, for example, by friction stir welding, to ensure good sealing.

[0096] In combination Figure 3 The bottom wall of the bottom plate 11 of the box body 10 is provided with a plurality of ribs 31. Some of the ribs 31 pass through the region where the mounting portion 111 is located. The ribs 31 adjacent to the mounting portion 111 are provided with a clearance section 3101 for avoiding the mounting portion 111.

[0097] If the bottom wall of the bottom plate 11 of the box body 10 is provided with other mounting structures, such as mounting holes for mounting other accessories, the ribs 31 adjacent to the mounting structures can be provided with clearance sections 3101 to avoid these mounting structures.

[0098] In a specific implementation, the bottom of the bottom plate 11 of the box body 10 is provided with a flow passage avoidance area 103. The flow passage avoidance area 103 is a region of the box body 10 that does not require heat dissipation. For example, the second accommodating cavity 102 of the box body 10 is used to mount related accessories, which can not require heat dissipation. Therefore, the flow passage avoidance area 103 can be provided at the position of the bottom plate 11 corresponding to the second accommodating cavity 102. When provided, the flow passage avoidance area 103 can partially correspond to the second accommodating cavity 102, and the specific arrangement can be determined according to the application requirements.

[0099] The part of the plurality of ribs 31 provided on the bottom wall of the bottom plate 11 is a partition rib 31B that partitions the flow channel avoiding area 103. It can be understood that the part of the partition rib 31B used to frame the liquid cooling part area can partition the flow channel avoiding area 103.

[0100] Figure 3 The illustrated is only an example of the flow channel avoiding area 103, and in other embodiments, the flow channel avoiding area 103 can also be in other forms, and in some other embodiments, the flow channel avoiding area 103 can also not be provided.

[0101] The box body 10 is formed by an integrated die-casting manner, which is more conducive to the flexible arrangement of the flow channel avoiding area 103 and the flexible arrangement of the rib 31.

[0102] In specific implementations, the flow channel avoiding area 103 can also be provided with a reinforcing rib 112, which is provided on the bottom wall of the bottom plate 11 to improve the structural strength of the flow channel avoiding area 103. The reinforcing rib 112 can also be integrally formed with the box body 10.

[0103] In specific implementations, the box body 10 is also fixedly connected with an external connecting pipe, which can include a liquid inlet pipe 41 and a liquid outlet pipe 42. In the illustrated example, the liquid inlet pipe 41 and the liquid outlet pipe 42 are both fixedly inserted on the front side plate 121 of the box body 10. The battery box also includes a passage part, which includes a liquid inlet passage part 20A and a liquid outlet passage part 20B. One end of the liquid inlet passage part 20A is in communication with the liquid inlet pipe 41, and the other end of the liquid inlet passage part 20A is in communication with a liquid inlet interface 201A of the bottom plate 11. One end of the liquid outlet passage part 20B is in communication with the liquid outlet pipe 42, and the other end of the liquid outlet passage part 20B is in communication with a liquid outlet interface 201B of the bottom plate 11.

[0104] At least one of the liquid inlet passage part 20A and the liquid outlet passage part 20B is integrally formed with the box body 10, so that a separate pipe is avoided between the box body 10 and the liquid cooling part, the number of parts is reduced, the assembly complexity is reduced, and multiple connection points existing when the separate pipe is assembled are avoided, which is conducive to ensuring the sealing.

[0105] In addition, the liquid inlet passage part 20A and the liquid outlet passage part 20B are integrally formed with the box body 10, which is also conducive to reducing the flow resistance of the cooling medium.

[0106] In specific implementations, the liquid inlet passage part 20A and the liquid outlet passage part 20B are located in the second containing cavity 102, which can be combined Figure 2 and reference Figure 6 understand; accordingly, part of the flow channel area of the liquid cooling part also corresponds to part of the area of the second containing cavity 102, so as to facilitate the liquid inlet passage part 20A and the liquid outlet passage part 20B to communicate with the liquid inlet interface 201A and the liquid outlet interface 201B, respectively.

[0107] As shown in Figure 2 and Figure 6 , the box body 10 further comprises a first mounting boss 51, which is arranged on the top wall of the box bottom plate 11, i.e. the first mounting boss 51 is located inside the box body 10, and the first mounting boss 51 is specifically provided with two, which are arranged adjacent to the liquid inlet passage part 20A and the liquid outlet passage part 20B. The first mounting boss 51 is used for mounting the temperature sensing part 80.

[0108] In application, the temperature of the cooling medium needs to be controlled according to the heat dissipation requirement of the battery cell assembly, and in order to accurately adjust, the inlet liquid temperature and the outlet liquid temperature in the liquid cooling part need to be known. The two temperature sensing parts 80 mounted on the two first mounting bosses 51 can respectively collect the inlet liquid temperature and the outlet liquid temperature of the liquid cooling part.

[0109] Specifically, the distance between the first mounting boss 51 and the liquid inlet passage part 20A or the liquid outlet passage part 20B is less than 100 mm, so as to ensure that the temperature sensing part 80 mounted on the first mounting boss 51 can accurately collect the temperature of the inlet liquid position and the temperature of the outlet liquid position of the liquid cooling part.

[0110] The first mounting boss 51 can be integrally formed with the box body 10.

[0111] As shown in Figure 2 and Figure 6 , the box body 10 further comprises a second mounting boss 52, which is used for mounting the accessories contained in the second containing cavity 103, such as the battery pack disconnect unit (BDU).

[0112] Three structures of the second mounting boss 52 are exemplarily shown in the figure, and in other implementation manners, the number and arrangement mode of the second mounting boss 52 can be flexibly adjusted according to the mounting requirement of the accessories.

[0113] The second mounting boss 52 can also be integrally formed with the box body 10.

[0114] The outer surface of the battery cell assembly is provided with an insulating coating, and in order to ensure the reliability of the fixation between the battery cell assembly and the box body 10 when assembled, the insulating coating of the bottom wall of the battery cell assembly is usually thinned, and in specific application, the top wall of the box bottom plate 11 of the box body 10 for bearing the battery cell assembly is further provided with an insulating layer 90 to ensure the insulation of the assembled battery cell assembly.

[0115] In specific implementation, the insulating layer 90 can be formed on the box bottom plate 11 by spraying, or can be separately provided on the box bottom plate 11. In one implementation manner, the material of the insulating layer 90 can be epoxy powder or UV ink, and the thickness of the insulating layer 90 can be 50 microns to 300 microns.

[0116] The application also provides a battery pack, which comprises a battery cell assembly and a battery box, wherein the battery box is the battery box described in the foregoing embodiments, and the battery cell assembly can be accommodated in the box body 10 of the battery box.

[0117] The application also provides a vehicle, which comprises a vehicle frame, and the battery pack described in the foregoing embodiments or the battery box described in the foregoing embodiments can be installed on the vehicle frame. In some application scenarios, the battery pack or the battery box can be installed on the chassis of the vehicle frame, and the installation position can be close to the position of the front seat.

[0118] The principles and implementation manners of the application are described by using specific examples in the present application, and the above description of the embodiments is only used to help understand the method of the application and its core idea. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the application without departing from the principles of the application, and these improvements and modifications also fall within the protection scope of the claims of the application.

Claims

1. A battery box, characterized by The battery box comprises a box body, the box body comprises a box bottom plate, the bottom of the box bottom plate is provided with a liquid cooling part, the liquid cooling part comprises at least one flow channel area; the box bottom plate has an interface, and the flow channel area communicated with the interface is an end flow channel area; A plurality of first ribs extending in a first direction are arranged in the end flow channel area, and a plurality of the first ribs are arranged in a second direction, and a cooling flow channel is formed between adjacent two first ribs; The interface is located on one side of the end flow channel area in the first direction, and the first rib has an interface end close to the interface; Among any two first ribs of at least one end flow channel area, the distance between the interface end of the first rib close to the interface and the interface in the first direction is a first distance, and the distance between the interface end of the first rib away from the interface and the interface in the first direction is a second distance, and the first distance is less than the second distance.

2. The battery pack of claim 1, wherein, The liquid cooling part comprises at least two flow channel areas, adjacent two flow channel areas are respectively an upstream side flow channel area and a downstream side flow channel area, the upstream side flow channel area and the downstream side flow channel area are arranged in a second direction, and a boundary rib is arranged between the upstream side flow channel area and the downstream side flow channel area; the liquid outlet end of the upstream side flow channel area is communicated with the liquid inlet end of the downstream side flow channel area, and in the first direction, the liquid outlet end of the upstream side flow channel area and the liquid inlet end of the downstream side flow channel area are located on the same side; The downstream side flow channel area comprises a boundary rib at the liquid inlet end thereof, the boundary rib extends in the second direction; a plurality of second ribs extending in the first direction are arranged in the downstream side flow channel area, a plurality of the second ribs are arranged in the second direction, and a cooling flow channel is formed between adjacent two second ribs; Among any two second ribs of at least one downstream side flow channel area, the distance between the inlet end of the second rib close to the boundary rib and the boundary rib in the first direction is a third distance, and the distance between the inlet end of the second rib away from the boundary rib and the boundary rib in the first direction is a fourth distance, and the third distance is greater than the fourth distance; wherein the inlet end of the second rib is an end of the second rib close to the liquid inlet end of the downstream side flow channel area.

3. The battery case according to claim 1 or 2, characterized by The box body is an integral molding structure, the liquid cooling part comprises a plurality of ribs, the ribs are fixedly arranged on the bottom wall of the box bottom plate, and the ribs are integrally formed with the box body.

4. The battery pack of claim 3, wherein, The battery box comprises a bottom sealing plate, and the bottom sealing plate is fixedly connected with the ribs.

5. The battery pack of claim 4, wherein, The bottom sealing plate and the ribs are fixedly connected by welding or gluing.

6. The battery pack of claim 3, wherein, The bottom wall of the box bottom plate is provided with a mounting structure, and among a plurality of ribs, a rib adjacent to the mounting structure has an avoiding section avoiding the mounting structure.

7. The battery pack of claim 6, wherein, The battery box comprises a bottom guard plate, the liquid cooling part is located between the bottom guard plate and the box bottom plate, a plurality of support columns are arranged between the bottom guard plate and the box bottom plate, one end of each support column is fixedly connected with the bottom guard plate, and the other end of each support column is fixedly connected with the box bottom plate; the mounting structure comprises a mounting portion for connecting the support columns.

8. The battery pack of claim 3, wherein, The bottom of the box bottom plate is provided with a flow channel avoiding area, and part of the plurality of ribs are partition ribs for partitioning the flow channel avoiding area.

9. The battery case according to claim 1 or 2, characterized by The battery box comprises a channel portion, one end of the channel portion is in communication with the external connecting pipe, and the other end of the channel portion is in communication with the interface; the channel portion and the box body are in an integral molding structure.

10. A battery pack, characterized by, The battery pack comprises a battery box and an electric core assembly, the battery box is the battery box as claimed in any one of claims 1-9, and the electric core assembly is accommodated in the box body.

11. An automobile characterized by The battery pack comprises a vehicle frame and a battery box, the battery box is the battery box as claimed in any one of claims 1-9, or the battery pack comprises a vehicle frame and a battery box, the battery box is the battery pack as claimed in claim 10.

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