Battery pack

Abstract

The utility model provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a box body, a battery cell assembly and a separator, and a liquid inlet and a liquid outlet of the box body can be communicated with an external cooling liquid pipeline, so that cooling liquid can enter the box body through the liquid inlet and is discharged through the liquid outlet. The cooling liquid can enter the cooling flow channel and the immersion flow channel, the cooling liquid in the immersion flow channel can be in direct contact with the battery cell assembly, and a part of heat generated in the charging and discharging process of the battery cell assembly can be directly conducted to the cooling liquid in the immersion flow channel. Part of heat generated in the charging and discharging process of the battery cell assembly can be conducted to the cooling liquid in the cooling flow channel through the inner wall of the box body, so that the heat of the battery cell assembly can be fully absorbed by the cooling liquid. The cooling flow channel and the immersion flow channel are arranged on the two opposite sides of the battery cell assembly, so that heat on the two opposite sides of the battery cell assembly can be fully absorbed by the cooling liquid, and the heat dissipation effect of each part of the battery cell assembly is relatively good.

Description

Technical Field

[0001] The present application relates to a battery pack, and belongs to the technical field of batteries. Background Art

[0002] The battery pack generates heat during operation, which increases the temperature of the battery pack. If the temperature of the battery pack is too high, the safety and reliability of the battery pack will be reduced. In order to ensure reliable operation of the battery pack, the battery pack needs to be cooled. Immersion cooling is to place the entire battery pack in coolant so that the coolant can directly contact the battery pack, thereby achieving better heat dissipation effect of the battery pack.

[0003] At present, in immersion-cooled battery packs, the coolant temperature near the liquid inlet is lower, while the coolant temperature near the liquid outlet is higher, resulting in a large temperature difference in the coolant used to dissipate heat in different parts of the battery, which leads to different heat dissipation effects on the battery surface, and ultimately causes the local temperature of the battery surface to be higher than other parts. Utility Model Content

[0004] The present application provides a battery pack that solves the problem of uneven heat dissipation effect of immersion heat dissipation batteries in the related art.

[0005] The present application provides a battery pack, comprising:

[0006] A box body, comprising a cavity, a liquid inlet, a liquid outlet and a cooling channel, wherein the cooling channel is connected to the liquid inlet and the liquid outlet, the cooling channel is located outside the cavity, and the cavity has a cooling wall opposite to the cooling channel;

[0007] A battery cell assembly is disposed in the cavity and in contact with the cooling wall, a gap is formed between the outer wall of a portion of the battery cell assembly and the inner wall of the cavity to form an immersion flow channel, the immersion flow channel is communicated with the liquid inlet and the liquid outlet, and at least a portion of the immersion flow channel and the cooling flow channel are located on opposite sides of the battery cell assembly;

[0008] A partition is arranged in the submerged channel to divide the submerged channel into a first sub-channel and a second sub-channel, wherein the downstream end of the first sub-channel is connected to the upstream end of the second sub-channel, and the upstream end of the first sub-channel is close to the downstream end of the second sub-channel.

[0009] In some embodiments, the battery cell assembly includes a plurality of battery cells, the plurality of battery cells are stacked along the thickness direction of the battery cells, a portion of the outer wall of any one of the battery cells has a gap with the inner wall of the cavity to form the immersion channel, and a portion of the outer wall of any one of the battery cells is in contact with the cooling wall.

[0010] In some embodiments, the battery cell assembly has a first side and a second side in the thickness direction of the battery cell, the upstream end of the first sub-channel is adjacent to the first side of the battery cell assembly, and the downstream end of the first sub-channel is adjacent to the second side of the battery cell assembly;

[0011] The extension directions of the first sub-channel and the second sub-channel are parallel.

[0012] In some embodiments, the cooling wall is the bottom wall of the cavity, and the first sub-flow channel and the second sub-flow channel are located between the top walls of the plurality of battery cells and the inner top wall of the box.

[0013] In some embodiments, the immersion flow channel further includes a side flow channel, and the side flow channel is located between the side wall of the battery cell assembly and the inner side wall of the box body;

[0014] An upstream end of the side flow channel is communicated with the first sub-flow channel, and a downstream end of the side flow channel is communicated with the second sub-flow channel.

[0015] In some embodiments, the box body includes a bottom plate and a shell portion, the shell portion has an opening, the bottom plate is sealed in the opening, the battery cell assembly is arranged on the bottom plate, the cooling channel is arranged on the bottom plate, the upstream end of the cooling channel is connected to the first sub-channel, and the downstream end of the cooling channel is connected to the second sub-channel.

[0016] In some embodiments, there are multiple dividers, and the multiple dividers are spaced apart along a direction perpendicular to the first side to the second side. The multiple dividers divide the immersion channel into multiple first sub-channels and multiple second sub-channels that are alternately arranged. Adjacent first sub-channels and second sub-channels constitute a sub-channel group. The first sub-channels and the second sub-channels in the sub-channel group are connected, and adjacent sub-channel groups are disconnected.

[0017] In some embodiments, the box body further has a flow-dividing cavity, the flow-dividing cavity is communicated with the liquid inlet, and the first sub-flow channels in the plurality of sub-flow channel groups are all communicated with the flow-dividing cavity;

[0018] The box body also has a manifold, which is communicated with the liquid outlet, and the second sub-flow channels in the plurality of sub-flow channel groups are all communicated with the manifold.

[0019] In some embodiments, the flow diversion cavity has flow diversion openings respectively connected to the plurality of first sub-channels, and the inner diameters of the plurality of flow diversion openings gradually increase in a direction away from the liquid inlet;

[0020] The manifold cavity has manifold openings respectively connected to the plurality of second sub-flow channels, and the inner diameters of the plurality of manifold openings gradually increase in a direction away from the liquid outlet.

[0021] In some embodiments, the housing further comprises a current collector and a current distributor, the current distributor and the current collector are detachably disposed in the shell, the current distributor cavity is located in the current distributor, and the current collecting cavity is located in the current collector.

[0022] In the battery pack provided in the present application, the liquid inlet and liquid outlet of the box body can be connected to the external coolant pipeline, so that the coolant can enter the box body through the liquid inlet and be discharged through the liquid outlet. The coolant can enter the cooling channel and the immersion channel. The coolant in the immersion channel can be in direct contact with the battery cell assembly. Part of the heat generated during the charging and discharging process of the battery cell assembly can be directly conducted to the coolant in the immersion channel. Part of the heat generated during the charging and discharging process of the battery cell assembly can also be conducted to the coolant in the cooling channel through the inner wall of the box body, so that the heat of the battery cell assembly can be fully absorbed by the coolant. The cooling channel and the immersion channel are arranged on opposite sides of the battery cell assembly, so that the heat on the opposite sides of the battery cell assembly can be fully absorbed by the coolant, so that the heat dissipation effect of each part of the battery cell assembly is good.

[0023] The partition is arranged in the submerged flow channel to divide the submerged flow channel into a first sub-flow channel and a second sub-flow channel, so that the coolant can flow from the first sub-flow channel to the second sub-flow channel, thereby increasing the flow path of the coolant in the box body, so that the coolant absorbs the heat of the battery cell assembly better. The temperature of the coolant in the upstream end of the first sub-flow channel is relatively low, and the temperature of the coolant in the downstream end of the second sub-flow channel is relatively high. The upstream end of the first sub-flow channel is close to the downstream end of the second sub-flow channel, so that the temperature of the battery cell assembly adjacent to the upstream end of the first sub-flow channel and the downstream end of the second sub-flow channel is relatively close to the temperature of the battery cell assembly adjacent to the downstream end of the first sub-flow channel and the upstream end of the second sub-flow channel, so that the heat dissipation effect of each part of the battery cell assembly is more balanced, so that the battery pack of the present application is more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and other purposes, features and advantages of the embodiments of the present application will become more easily understood through the following detailed description with reference to the accompanying drawings. In the accompanying drawings, multiple embodiments of the present application will be described in an exemplary and non-limiting manner, wherein:

[0025] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present application;

[0026] Figure 2 A schematic top view of the internal structure of a battery pack according to an embodiment of the present application;

[0027] Figure 3 A schematic side view of the internal structure of a battery pack according to an embodiment of the present application;

[0028] Figure 4 Schematic diagram of the current distributor and current collector of the battery pack according to the embodiment of the present application.

[0029] Reference numerals:

[0030] 100-box, 110-bottom plate, 111-cooling channel, 112-cooling wall, 120-shell, 121-liquid inlet, 122-liquid outlet, 123-immersed channel, 123a-first sub-channel, 123b-second sub-channel, 123c-side channel, 130-flow distributor, 131-flow distributor cavity, 132-flow distributor port, 140-current collector, 141-collecting cavity, 142-collecting port, 150-sub-channel group,

[0031] 200 - battery cell assembly, 210 - first side, 220 - second side, 230 - battery cell,

[0032] 300 - Divider. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0034] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0036] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0037] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0038] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0039] The battery pack generates heat during operation, which increases the temperature of the battery pack. If the temperature of the battery pack is too high, the safety and reliability of the battery pack will be reduced. In order to ensure reliable operation of the battery pack, the battery pack needs to be cooled. Immersion cooling is to place the entire battery pack in coolant so that the coolant can directly contact the battery pack, thereby achieving better heat dissipation effect of the battery pack.

[0040] At present, in immersion-cooled battery packs, the coolant temperature near the liquid inlet is lower, while the coolant temperature near the liquid outlet is higher, resulting in a large temperature difference in the coolant used to dissipate heat in different parts of the battery, which leads to different heat dissipation effects on the battery surface, and ultimately causes the local temperature of the battery surface to be higher than other parts.

[0041] In the battery pack proposed in the present application, the liquid inlet and liquid outlet of the box body can be connected to the external coolant pipeline, so that the coolant can enter the box body through the liquid inlet and be discharged through the liquid outlet. The coolant can enter the cooling channel and the immersion channel. The coolant in the immersion channel can be in direct contact with the battery cell assembly. Part of the heat generated during the charging and discharging process of the battery cell assembly can be directly conducted to the coolant in the immersion channel. Part of the heat generated during the charging and discharging process of the battery cell assembly can also be conducted to the coolant in the cooling channel through the inner wall of the box body, so that the heat of the battery cell assembly can be fully absorbed by the coolant. The cooling channel and the immersion channel are arranged on opposite sides of the battery cell assembly, so that the heat on the opposite sides of the battery cell assembly can be fully absorbed by the coolant, so that the heat dissipation effect of each part of the battery cell assembly is good.

[0042] The partition is arranged in the submerged flow channel to divide the submerged flow channel into a first sub-flow channel and a second sub-flow channel, so that the coolant can flow from the first sub-flow channel to the second sub-flow channel, thereby increasing the flow path of the coolant in the box body, so that the coolant absorbs the heat of the battery cell assembly better. The temperature of the coolant in the upstream end of the first sub-flow channel is relatively low, and the temperature of the coolant in the downstream end of the second sub-flow channel is relatively high. The upstream end of the first sub-flow channel is close to the downstream end of the second sub-flow channel, so that the temperature of the battery cell assembly adjacent to the upstream end of the first sub-flow channel and the downstream end of the second sub-flow channel is relatively close to the temperature of the battery cell assembly adjacent to the downstream end of the first sub-flow channel and the upstream end of the second sub-flow channel, so that the heat dissipation effect of each part of the battery cell assembly is more balanced, so that the battery pack of the present application is more reliable.

[0043] The battery pack provided in this application is described in detail below in conjunction with specific embodiments.

[0044] The present application embodiment proposes a battery pack, referring to Figures 1 to 3 As shown, it includes a box body 100, a battery cell assembly 200 and a separator 300. The battery pack can be used as a power battery in a car or in other electrical devices, which is not limited in this application.

[0045] Among them, the box body 100 is the basic component of the battery pack of the present application. The box body 100 can provide a mounting base for at least some of the other components of the battery pack and protect at least some of the other components. The box body 100 can be made of metal material, so that the box body 100 has better structural strength, thereby making the durability and reliability of the box body 100 better. The box body 100 has a cavity inside, and the cavity inside the box body 100 can be used to install at least some of the other components of the battery pack. The battery cell assembly 200 can be set in the cavity of the box body 100.

[0046] The housing 100 has a liquid inlet 121, a liquid outlet 122 and a cooling channel 111. The liquid inlet 121 and the liquid outlet 122 of the housing 100 are both connected to the cooling channel 111, and the cooling channel 111 is located outside the cavity of the housing 100. Specifically, the cooling channel 111 is a cavity structure in a solid structure formed by the housing 100 to form a cavity. The cavity has a cooling wall 112 opposite to the cooling channel 111, and the cooling channel 111 is separated from the cavity by the cooling wall 112. The liquid inlet 121 of the housing 100 can also be connected to an external cooling component, and the cooling component can input coolant into the cooling channel 111 through the liquid inlet 121. The liquid outlet 122 of the housing 100 can also be connected to an external cooling component, and the coolant in the cooling channel 111 can be discharged through the liquid outlet 122 and circulate back to the cooling component. At least part of the outer wall of the battery cell assembly 200 can be arranged in contact with the cooling wall 112 in the cavity, so that the heat generated by the battery cell assembly 200 can be conducted to the cooling wall 112 of the cavity, and then conducted to the cooling channel 111 to be absorbed by the coolant, so that the heat of the battery cell assembly 200 can be dissipated to reduce the temperature of the battery cell assembly 200.

[0047] At least part of the outer wall of the battery cell assembly 200 in the box body 100 also has a gap with the inner wall of the cavity of the box body 100. The gap between the battery cell assembly 200 and the inner wall of the cavity of the box body 100 can form an immersion channel 123, so that the outer wall of the battery cell assembly 200 and the inner wall of the cavity of the box body 100 can constitute the inner wall of the immersion channel 123. The immersion channel 123 is also connected with the liquid inlet 121 and the liquid outlet 122 of the box body 100, so that the coolant can also enter the immersion channel 123 and be discharged through the liquid outlet 122. The coolant in the immersion channel 123 can directly contact the battery cell assembly 200, and the heat generated by the battery cell assembly 200 during the charging and discharging process can be directly absorbed by the coolant, so that the heat of the battery cell assembly 200 can be more fully dissipated, thereby further reducing the temperature of the battery cell assembly 200.

[0048] The cooling channels 111 and the immersion channels 123 in the box body 100 can be distributed on opposite sides of the battery cell assembly 200, so that the outer walls on the opposite sides of the battery cell assembly 200 can directly or indirectly contact the coolant, so that the heat on the opposite sides of the battery cell assembly 200 can be fully dissipated, so that the temperature of each part of the surface of the battery cell 230 can be effectively reduced, so that the heat dissipation effect of the battery cell assembly 200 is better.

[0049] The partition 300 is disposed in the submerged flow channel 123 in the housing 100, and the partition 300 can divide the submerged flow channel 123 into a first sub-flow channel 123a and a second sub-flow channel 123b. The first sub-flow channel 123a is connected to the second sub-flow channel 123b. Specifically, the downstream end of the first sub-flow channel 123a is connected to the upstream end of the second sub-flow channel 123b. Accordingly, the upstream end of the first sub-flow channel 123a is relatively closer to the liquid inlet 121 of the housing 100, and the downstream end of the second sub-flow channel 123b is relatively closer to the liquid outlet 122 of the housing 100. The coolant entering the liquid inlet 121 can pass through the upstream end and downstream end of the first sub-flow channel 123a in sequence, and then pass through the upstream end and downstream end of the second sub-flow channel 123b in sequence. The upstream end of the first sub-channel 123a is close to the downstream end of the second sub-channel 123b, and correspondingly, the upstream end of the first sub-channel 123a may be far away from the upstream end of the second sub-channel 123b.

[0050] It should be understood that the lower the temperature of the coolant, the more heat the coolant can absorb, and the better the heat dissipation effect of the coolant on the battery cell assembly 200. When the coolant reaches the upstream end of the first sub-channel 123a from the liquid inlet 121 of the box 100, the coolant has not yet fully contacted with the battery cell assembly 200 for heat exchange. Accordingly, the temperature of the coolant at the upstream end of the first sub-channel 123a is relatively low. As the coolant continues to flow through the downstream end of the first sub-channel 123a, the upstream end of the second sub-channel 123b, and the downstream end of the second sub-channel 123b, the coolant continues to absorb the heat of the battery cell assembly 200, so that the temperature of the coolant gradually increases, and accordingly, the effect of the coolant absorbing the heat of the battery cell 230 is weaker.

[0051] Specifically, the temperature of the coolant at the upstream end of the first sub-channel 123a is relatively the lowest, and the effect of absorbing the heat of the battery cell assembly 200 is the strongest, while the temperature of the coolant at the downstream end of the second sub-channel 123b is relatively the highest, and the effect of absorbing the heat of the battery cell assembly 200 is the weakest. The temperature of the coolant at the downstream end of the first sub-channel 123a and the upstream end of the second sub-channel 123b is between the temperature of the coolant at the upstream end of the first sub-channel 123a and the temperature of the coolant at the downstream end of the second sub-channel 123b, and accordingly, the heat absorption effect is also between the above two. In this way, the heat dissipation effect of the battery cell assembly 200 adjacent to the upstream end of the first sub-channel 123a and the downstream end of the second sub-channel 123b is relatively close to that of the battery cell assembly 200 adjacent to the downstream end of the first sub-channel 123a and the upstream end of the second sub-channel 123b, so that the temperature of each part of the battery cell assembly 200 is relatively close, avoiding the local temperature of the battery cell assembly 200 from being too high, and making the heat dissipation effect of the battery pack of the present application better.

[0052] In some embodiments, reference Figure 2As shown, the battery cell assembly 200 of the present application includes a plurality of battery cells 230, and the plurality of battery cells 230 can be stacked on the bottom wall of the inner cavity of the box body 100 along the thickness direction of the battery cells 230, and the plurality of battery cells 230 are electrically connected, so that the plurality of battery cells 230 can output electrical energy at the same time. The plurality of battery cells 230 are stacked along the thickness direction of the battery cells 230, so that the structure of the battery cell assembly 200 can be relatively more compact. Among the plurality of battery cells 230, part of the outer wall of any battery cell 230 can be arranged in contact with the cooling wall 112 of the cavity of the box body 100, so that the heat generated by any battery cell 230 can be conducted to the cooling channel 111 through the cooling wall 112 and absorbed by the coolant. Among the multiple battery cells 230, a partial outer wall of any battery cell 230 has a gap with the inner wall of the cavity of the box body 100 to form an immersion channel 123, so that any battery cell 230 can also directly contact the coolant in the immersion channel 123, so that the heat generated by the battery cell 230 can be directly absorbed by the coolant.

[0053] The heat generated by the multiple battery cells 230 in the battery cell assembly 200 can be absorbed by the coolant in the cooling channel 111 and the coolant in the immersion channel 123, so that the multiple battery cells 230 have a better heat dissipation effect, thereby making the battery cell assembly 200 have a better heat dissipation effect, and at the same time, it can further avoid the occurrence of local overtemperature of the battery cell assembly 200.

[0054] In some embodiments, reference Figure 2 As shown, the battery cell assembly 200 of the present application has a first side 210 and a second side 220 in the thickness direction of a single battery cell 230, that is, the first side 210 and the second side 220 are located on opposite sides of the battery cell assembly 200 in the stacking direction of multiple battery cells 230. The upstream end of the first sub-channel 123a is adjacent to the first side 210 of the battery cell assembly 200, and the downstream end of the first sub-channel 123a is adjacent to the second side 220 of the battery cell assembly 200. Correspondingly, the downstream end of the second sub-channel 123b is adjacent to the first side 210 of the battery cell assembly 200, and the upstream end of the second sub-channel 123b is adjacent to the second side 220 of the battery cell assembly 200. In this way, the first sub-channel 123a can extend from a position adjacent to the first side 210 of the battery cell assembly 200 to a position adjacent to the second side 220 of the battery cell assembly 200. The second sub-channel 123b can extend from a position adjacent to the second side 220 of the battery cell assembly 200 to a position adjacent to the first side 210 of the battery cell assembly 200, so that the coolant in the first sub-channel 123a and the coolant in the second sub-channel 123b can fully contact various parts of the battery cell assembly 200 in the direction from the first side 210 to the second side 220, thereby making the coolant in the immersion channel 123 have a better heat dissipation and cooling effect on the battery cell assembly 200.

[0055] The extension direction of the first sub-channel 123a and the extension direction of the second sub-channel 123b can also be set in parallel. Specifically, the first sub-channel 123a and the second sub-channel 123b can both be set as a straight channel structure, so as to further increase the contact area between the coolant in the first sub-channel 123a and the second sub-channel 123b and the surface of the battery cell assembly 200, so that the coolant in the first sub-channel 123a and the second sub-channel 123b can better absorb the heat of the battery cell assembly 200.

[0056] In some embodiments, reference Figure 3 As shown, the cooling channel 111 of the box 100 in the present application can be arranged on the bottom side of the battery cell assembly 200, and accordingly, the cooling wall 112 in the box 100 is the bottom wall of the inner cavity of the box 100, so that the cooling wall 112 in the cavity can also support the battery cell assembly 200, so that the contact effect between the battery cell assembly 200 and the cooling wall 112 is better. There is also a gap between the top of the battery cell assembly 200 and the inner top wall of the cavity of the box 100, so that the first sub-channel 123a and the second sub-channel 123b in the submerged channel 123 can be formed between the top of the battery cell assembly 200 and the inner top wall of the box 100. In this way, the cooling channel 111 and the partially submerged channel 123 in the box 100 can be distributed on the opposite sides of the battery cell assembly 200, so that the bottom side and the top side of the battery cell assembly 200 can fully dissipate heat.

[0057] In some embodiments, reference Figure 3 As shown, the immersion channel 123 in the box 100 in the present application may also include a side channel 123c, wherein the side channel 123c may be arranged between the side wall of the battery cell assembly 200 and the inner side wall of the box 100. Specifically, there is a gap between the side wall of the battery cell assembly 200 and the inner side wall of the box 100 to form the side channel 123c, and the side channel 123c is also connected with the liquid inlet 121 and the liquid outlet 122 of the box 100. The coolant can also enter the side channel 123c through the liquid inlet 121 of the box 100, and the coolant in the side channel 123c can contact the side wall of the battery cell assembly 200 to absorb the heat of the side of the battery cell assembly 200, so that the heat of the bottom, top and side of the battery cell assembly 200 can be absorbed by the coolant in the corresponding channel, so that the temperature of each part of the surface of the battery cell assembly 200 can be effectively reduced.

[0058] Specifically, the upstream end of the side channel 123c may be arranged to communicate with the first sub-channel 123a, and the downstream end of the side channel 123c may be arranged to communicate with the second sub-channel 123b, so that the coolant can enter the side channel 123c.

[0059] In some embodiments, reference Figure 2As shown, the number of the partitions 300 in the present application can be set to multiple, and the multiple partitions 300 can be arranged in the submerged channel 123 at intervals along the direction perpendicular to the first side 210 to the second side 220, so that multiple first sub-channels 123a and multiple second sub-channels 123b arranged alternately can be formed in the submerged channel 123. Adjacent first sub-channels 123a and second sub-channels 123b can be connected to form a sub-channel group 150, and the number of sub-channel groups 150 is also multiple. The first sub-channel 123a in any sub-channel group 150 is connected to the liquid inlet 121 of the box 100, and the second sub-channel 123b is connected to the liquid outlet 122 of the box 100. Adjacent sub-channel groups 150 are independently arranged and are in a non-connected state. Multiple sub-channel groups 150 are arranged along a direction perpendicular to the direction from the first side 210 to the second side 220 of the battery cell assembly 200, so that the multiple sub-channel groups 150 can correspond to various parts of the battery cell assembly 200 in the direction perpendicular to the first side 210 to the second side 220. This can further refine the structure of the immersion channel 123, so that the cooling effect of the coolant in the immersion channel 123 on various parts of the battery cell assembly 200 is closer.

[0060] Specifically, among the multiple first sub-channels 123a and the multiple second sub-channels 123b in the multiple sub-channel groups 150, the first sub-channels 123a and the second sub-channels 123b located on both sides of the battery cell assembly 200 can be connected to the side channel 123c so that the coolant can enter the side channel 123c.

[0061] In some embodiments, reference Figure 3 As shown, the box body 100 of the present application can be configured to include a bottom plate 110 and a shell 120, wherein the shell 120 is provided with an opening, the bottom plate 110 can be sealed to the opening of the shell 120, and the bottom plate 110 and the shell 120 are arranged to form a cavity of the box body 100. The cooling channel 111 is arranged in the bottom plate 110, and the outer wall of the bottom plate 110 facing the shell 120 is the cooling wall 112. The liquid inlet 121 and the liquid outlet 122 of the box body 100 can be arranged on the shell 120, and the cooling wall 112 on the side of the bottom plate 110 facing the shell 120 can also be provided with a liquid inlet opening and a liquid outlet opening, so that the coolant can enter the cooling channel 111 of the cold plate through the liquid inlet opening and be discharged through the liquid outlet opening.

[0062] The bottom plate 110 and the shell 120 can be processed separately and then connected by welding, which can reduce the difficulty of the manufacturing process of the box body 100 and reduce the manufacturing cost of the battery pack of the present application.

[0063] In some embodiments, reference Figure 3As shown, a shunt chamber 131 may also be provided in the housing 100 of the present application, wherein the shunt chamber 131 and the chamber in the housing 100 are independent chamber structures, the shunt chamber 131 is connected to the liquid inlet 121 of the housing 100, and the first sub-channels 123a in the plurality of sub-channel groups 150 are all connected to the shunt chamber 131. The coolant may first enter the shunt chamber 131 through the liquid inlet 121 of the housing 100, and then be shunted to the plurality of first sub-channels 123a. The shunt chamber 131 may be provided at one side of the top of the housing 100, and accordingly, the liquid inlet 121 of the housing 100 may also be provided at one side of the top of the housing 100.

[0064] The housing 100 of the present application may also be provided with a manifold 141, wherein the manifold 141 and the chamber in the housing 100 are independent chamber structures, the manifold 141 is in communication with the liquid outlet 122 of the housing 100, and the second sub-channels 123b in the plurality of sub-channel groups 150 are all in communication with the manifold 141. The coolant in the plurality of second sub-channels 123b may converge into the manifold 141, and then be discharged through the liquid outlet 122. The manifold 141 may be provided at one side of the bottom of the housing 100, and correspondingly, the liquid outlet 122 of the housing 100 may also be provided at one side of the bottom of the housing 100.

[0065] In some embodiments, reference Figure 1 and Figure 4 As shown, in order to make the flow-dividing cavity 131 communicate with the plurality of first sub-flow channels 123a, the flow-dividing cavity 131 is provided with a plurality of flow-dividing openings 132, and the plurality of flow-dividing openings 132 are respectively communicated with the plurality of first sub-flow channels 123a. In the direction away from the liquid inlet 121 of the box body 100, the inner diameters of the plurality of flow-dividing openings 132 gradually increase, so that the flow rate of the coolant in the flow-dividing cavity 131 passing into each first sub-flow channel 123a is close, so that the portion corresponding to each first sub-flow channel 123a of the battery cell assembly 200 has a relatively consistent heat dissipation effect.

[0066] In order to make the manifold 141 communicate with the plurality of second sub-channels 123b, the manifold 141 is provided with a plurality of manifold ports 142, and the plurality of manifold ports 142 are respectively communicated with the plurality of second sub-channels 123b. In the direction away from the liquid outlet 122 of the box 100, the inner diameters of the plurality of manifold ports 142 gradually increase, so that the flow rate of the coolant in each second sub-channel 123b passing into the manifold 141 can be close, so that the portion corresponding to the battery cell assembly 200 and each second sub-channel 123b has a relatively consistent heat dissipation effect.

[0067] In some embodiments, reference Figure 1 and Figure 3As shown, the case 100 of the present application may also be provided with a current collector 140, a current collecting cavity 141 is provided in the current collector 140, and the current collecting cavity 141 is a cavity structure in the current collector 140. The current collector 140 can be fixed outside the cavity of the case 100 and connected to the outer wall of the shell 120. In this way, the case 100 and the current collector 140 can be separately processed and prepared and then assembled, so as to reduce the difficulty of the preparation process of the battery pack of the present application. The current collector 140 and the shell 120 can be connected by welding, so that the connection effect between the current collector 140 and the shell 120 is more stable and reliable.

[0068] The case 100 of the present application may also be provided with a flow divider component 130, and a flow divider cavity 131 is provided in the flow divider component 130, and the flow divider cavity 131 is a cavity structure in the flow divider component 130. The flow divider component 130 may be fixed outside the cavity of the case 100 and connected to the outer wall of the shell 120. In this way, the shell 120 and the flow divider component 130 may be separately processed and prepared and then assembled, so as to reduce the difficulty of the preparation process of the battery pack of the present application. The flow divider component 130 and the shell 120 may be connected by welding, so that the connection effect between the flow divider component 130 and the shell 120 is more stable and reliable.

[0069] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A battery pack, characterized in that: include: A box body (100) comprises a cavity, a liquid inlet (121), a liquid outlet (122) and a cooling channel (111), wherein the cooling channel (111) is in communication with the liquid inlet (121) and the liquid outlet (122), the cooling channel (111) is located outside the cavity, and the cavity comprises a cooling wall (112) opposite to the cooling channel (111); A battery cell assembly (200) is arranged in the cavity and in contact with the cooling wall (112); a gap is formed between a portion of the outer wall of the battery cell assembly (200) and an inner wall of the cavity to form an immersion channel (123); the immersion channel (123) is connected to the liquid inlet (121) and the liquid outlet (122); and at least a portion of the immersion channel (123) and the cooling channel (111) are located on opposite sides of the battery cell assembly (200); A partition (300) is arranged in the submerged flow channel (123) to divide the submerged flow channel (123) into a first sub-flow channel (123a) and a second sub-flow channel (123b), wherein the downstream end of the first sub-flow channel (123a) is connected to the upstream end of the second sub-flow channel (123b), and the upstream end of the first sub-flow channel (123a) is close to the downstream end of the second sub-flow channel (123b).

2. The battery pack according to claim 1, characterized in that: The battery cell assembly (200) comprises a plurality of battery cells (230), wherein the plurality of battery cells (230) are stacked along the thickness direction of the battery cells (230), a portion of the outer wall of any one of the battery cells (230) and an inner wall of the cavity have a gap to form the immersion channel (123), and a portion of the outer wall of any one of the battery cells (230) is in contact with the cooling wall (112).

3. The battery pack according to claim 2, characterized in that: The battery cell assembly (200) has a first side (210) and a second side (220) in the thickness direction of the battery cell (230), the upstream end of the first sub-channel (123a) is adjacent to the first side (210) of the battery cell assembly (200), and the downstream end of the first sub-channel (123a) is adjacent to the second side (220) of the battery cell assembly (200); The extension directions of the first sub-channel (123a) and the second sub-channel (123b) are parallel.

4. The battery pack according to claim 3, characterized in that: The cooling wall (112) is the bottom wall of the cavity, and the first sub-channel (123a) and the second sub-channel (123b) are located between the top walls of the plurality of battery cells (230) and the inner top wall of the box body (100).

5. The battery pack according to claim 4, characterized in that: The submerged flow channel (123) further comprises a side flow channel (123c), wherein the side flow channel (123c) is located between the side wall of the battery cell assembly (200) and the inner side wall of the box body (100); The upstream end of the side flow channel (123c) is in communication with the first sub-flow channel (123a), and the downstream end of the side flow channel (123c) is in communication with the second sub-flow channel (123b).

6. The battery pack according to any one of claims 3 to 5, characterized in that: The box body (100) comprises a bottom plate (110) and a shell (120); the shell (120) has an opening; the bottom plate (110) is sealed at the opening; the battery cell assembly (200) is arranged on the bottom plate (110); the cooling channel (111) is arranged on the bottom plate (110); the upstream end of the cooling channel (111) is connected to the first sub-channel (123a); and the downstream end of the cooling channel (111) is connected to the second sub-channel (123b).

7. The battery pack according to claim 6, characterized in that: There are a plurality of the separators (300), and the plurality of the separators (300) are arranged at intervals along a direction perpendicular to the first side (210) to the second side (220). The plurality of separators (300) separate the immersion channel (123) into a plurality of first sub-channels (123a) and a plurality of second sub-channels (123b) that are alternately arranged. Adjacent first sub-channels (123a) and second sub-channels (123b) constitute a sub-channel group (150). The first sub-channels (123a) and the second sub-channels (123b) in the sub-channel group (150) are connected, and adjacent sub-channel groups (150) are disconnected.

8. The battery pack according to claim 7, characterized in that: The box body (100) further comprises a flow-dividing chamber (131), the flow-dividing chamber (131) being in communication with the liquid inlet (121), and the first sub-flow channels (123a) in the plurality of sub-flow channel groups (150) are all in communication with the flow-dividing chamber (131); The box body (100) further comprises a manifold (141), the manifold (141) being in communication with the liquid outlet (122), and the second sub-flow channels (123b) in the plurality of sub-flow channel groups (150) are all in communication with the manifold (141).

9. The battery pack according to claim 8, characterized in that: The flow-dividing cavity (131) has flow-dividing openings (132) respectively connected to the plurality of first sub-flow channels (123a), and the inner diameters of the plurality of flow-dividing openings (132) gradually increase in a direction away from the liquid inlet (121); The manifold cavity (141) has manifold openings (142) respectively connected to the plurality of second sub-flow channels (123b), and the inner diameters of the plurality of manifold openings (142) gradually increase in a direction away from the liquid outlet (122).

10. The battery pack according to claim 9, characterized in that: The housing (100) further comprises a current collector component (140) and a current distributor component (130), wherein the current distributor component (130) and the current collector component (140) are detachably arranged in the shell (120), the current distributor cavity (131) is located in the current distributor component (130), and the current collector cavity (141) is located in the current collector component (140).

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