Battery pack

Abstract

The utility model provides a battery pack, and relates to the technical field of batteries. The battery pack comprises a shell and a battery cell. The containing cavity of the shell can be used for containing the battery cell, the outer wall of the battery cell can be opposite to the inner wall of the containing cavity after the battery cell is placed in the containing cavity, and heat generated in the working process of the battery cell can be dissipated and conducted to the shell. External cooling liquid can enter the cooling flow channel through the liquid inlet of the shell and is discharged through the liquid outlet, so that the cooling liquid can circulate in the cooling flow channel in a circulating mode. When the cooling liquid flows through the cooling flow channel, heat conducted to the shell by the battery cell can be absorbed and taken out, so that the purpose of cooling the battery cell is achieved, and the battery pack is safer and more reliable in operation. The shell adopts the injection molding part, so that the shell can be integrally formed through an injection molding process, an additional assembly link is not needed in the preparation process of the shell, and the preparation cost of the shell can be reduced.

Description

Technical Field

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

[0002] The battery module generates a lot of heat during operation, which affects the operation of the battery module. Therefore, a heat dissipation device is required to dissipate heat from the battery module to reduce the temperature of the battery module. The heat dissipation device can be configured to have a coolant flowing inside, and the battery contacts the heat dissipation device so that the heat of the battery can be absorbed by the coolant.

[0003] Currently, heat sinks use metal structural parts, and the preparation process of such heat sinks is relatively complicated, resulting in a high cost of the heat sink. Utility Model Content

[0004] The present application provides a battery pack, which solves the problem of high cost of the heat dissipation device of the battery pack in the related art.

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

[0006] A shell having a cavity, the shell further having a liquid inlet, a liquid outlet and a cooling channel, the cooling channel being in communication with the liquid inlet and the liquid outlet, and the cooling channel being disposed around at least a portion of the cavity;

[0007] A battery cell is disposed in the cavity;

[0008] Wherein, the shell is an injection molded part.

[0009] In some embodiments, the side wall of the battery core is opposite to the inner wall of the cavity, and the cooling channel is arranged around the inner wall of the cavity.

[0010] In some embodiments, thermally conductive adhesive is filled between the side wall of the battery core and the inner wall of the cavity.

[0011] In some embodiments, the number of the cavities and the number of the battery cells are both multiple, and the multiple battery cells are arranged in the multiple cavities in a one-to-one correspondence;

[0012] The cooling channel includes a plurality of cooling sub-channels, and the plurality of cooling sub-channels are respectively arranged around the plurality of cavities.

[0013] In some embodiments, the plurality of cavities are arranged along a first direction to form a cavity group, the number of the cavity groups is also multiple, and the plurality of cavity groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

[0014] In some embodiments, the plurality of cooling sub-channels corresponding to the plurality of cavities in the cavity group are sequentially connected along the first direction.

[0015] In some embodiments, there are multiple liquid inlets and multiple liquid outlets, and any one of the liquid inlets and any one of the liquid outlets is in communication with at least one of the cooling sub-channels.

[0016] In some embodiments, the shell includes an outer shell and a plurality of cooling blocks, the plurality of cooling blocks are arranged in the outer shell, the plurality of cavities and the plurality of cooling sub-channels are arranged in the plurality of cooling blocks in a one-to-one correspondence, and there is a gap between adjacent cooling blocks.

[0017] In some embodiments, the shell further includes a reinforcing protrusion, and the reinforcing protrusion is disposed on an outer wall of the cooling block.

[0018] In some embodiments, the shell has a partition, the cooling channel and the cavity are located on opposite sides of the partition, and the thickness of the partition is (*).

[0019] In some embodiments, a bottom plate is further included, the shell is disposed on the bottom plate, the shell is provided with a first air outlet connected to the cavity, the bottom plate is provided with a second air outlet, and the first air outlet is connected to the second air outlet.

[0020] In some embodiments, the shell is made of a polymer material.

[0021] In the battery pack provided by the present application, the cavity of the shell can be used to place the battery cell. After the battery cell is placed in the cavity, the outer wall of the battery cell can be opposite to the inner wall of the cavity, and the heat generated during the operation of the battery cell can be dissipated and conducted to the shell. The external coolant can enter the cooling channel through the liquid inlet of the shell and be discharged through the liquid outlet, so that the coolant can circulate in the cooling channel. In the process of the coolant flowing through the cooling channel, it can absorb the heat conducted from the battery cell to the shell, and take the heat out, so as to achieve the purpose of cooling the battery cell, making the battery pack of the present application operate more safely and reliably.

[0022] The shell is an injection molded part, so that the shell can be integrally formed through an injection molding process, so that the shell does not require additional assembly steps during the preparation process, thereby reducing the preparation cost of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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:

[0024] Figure 1 A schematic diagram of a battery pack according to an embodiment of the present application;

[0025] Figure 2A schematic diagram of an implementation manner of a housing of a battery pack according to an embodiment of the present application;

[0026] Figure 3 A schematic diagram of another implementation of a housing of a battery pack according to an embodiment of the present application;

[0027] Figure 4 A schematic bottom view of a housing of a battery pack according to an embodiment of the present application;

[0028] Figure 5 A schematic diagram of the back side of the housing of the battery pack according to an embodiment of the present application;

[0029] Figure 6 A schematic diagram of a reinforcing protrusion of a battery pack according to an embodiment of the present application;

[0030] Figure 7 A schematic top view of a housing of a battery pack according to an embodiment of the present application;

[0031] Figure 8 A schematic diagram of a bottom plate of a battery pack according to an embodiment of the present application;

[0032] Fig. 9 Schematic diagram of a communication port of a battery pack shell according to an embodiment of the present application.

[0033] Reference numerals:

[0034] 100-shell, 110-cavity group, 111-cavity, 111a-first air outlet, 111b-communication port, 120-liquid inlet, 130-liquid outlet, 140-cooling channel, 141-cooling sub-channel, 150-housing, 160-cooling block, 170-reinforcement protrusion, 180-partition, 190-mold stripping cavity,

[0035] 200-cell,

[0036] 300 - bottom plate, 310 - second air outlet. DETAILED DESCRIPTION

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] The battery pack generates a lot of heat during operation, which affects the operation of the battery pack. Therefore, a heat dissipation device is needed to dissipate heat from the battery pack to reduce the temperature of the battery pack. The heat dissipation device can be configured to flow coolant inside, and the battery contacts the heat dissipation device so that the heat of the battery can be absorbed by the coolant.

[0044] Currently, the heat sink uses metal structural parts. The preparation process of such a heat sink is relatively complicated, resulting in a high cost of the heat sink. In addition, the heat sink itself is also relatively heavy.

[0045] In the battery pack proposed in the present application, the cavity of the shell can be used to place the battery cell. After the battery cell is placed in the cavity, the outer wall of the battery cell can be opposite to the inner wall of the cavity, and the heat generated during the operation of the battery cell can be dissipated and conducted to the shell. The external coolant can enter the cooling channel through the liquid inlet of the shell and be discharged through the liquid outlet, so that the coolant can circulate in the cooling channel. In the process of the coolant flowing through the cooling channel, it can absorb the heat conducted from the battery cell to the shell, and take the heat out, so as to achieve the purpose of cooling the battery cell, making the battery pack of the present application safer and more reliable.

[0046] The shell is an injection molded part, so that the shell can be integrally formed through an injection molding process, so that the shell does not require additional assembly steps during the preparation process, thereby reducing the preparation cost of the shell.

[0047] The battery pack provided in the present application is described in detail below in conjunction with specific embodiments.

[0048] The present application embodiment provides a battery pack, referring to Figures 1 to 4 As shown, it includes a housing 100 and a battery cell 200. The battery pack can be used as a power battery in a car or in other electrical devices, and this application does not limit this.

[0049] Among them, the shell 100 is the basic component of the battery pack of the present application, and the shell 100 can provide an installation basis for at least some of the other components of the battery pack and protect at least some of the other components. The shell 100 is provided with a cavity 111, and the cavity 111 of the shell 100 can be used to accommodate the battery cell 200. The cavity shape and size of the cavity 111 of the shell 100 can be set to match the shape and size of the battery cell 200, so that the battery cell 200 can be relatively stably and reliably installed in the cavity 111. Specifically, the size of the cavity 111 can be set to be slightly larger than the size of the battery cell 200, so that the inner wall of the cavity 111 of the shell 100 can limit the battery cell 200, and the battery cell 200 can be conveniently installed in the cavity 111 of the shell 100.

[0050] The housing 100 is also provided with a liquid inlet 120, a liquid outlet 130 and a cooling channel 140. The cooling channel 140 of the housing 100 is a closed cavity channel structure inside the housing 100. The liquid inlet 120 and the liquid outlet 130 can be arranged on the surface of the housing 100, and the liquid inlet 120 and the liquid outlet 130 are both connected to the cooling channel 140 of the housing 100. External coolant can flow into the cooling channel 140 through the liquid inlet 120 of the housing 100, and be discharged through the liquid outlet 130 of the housing 100. Specifically, the liquid inlet 120 and the liquid outlet 130 of the housing 100 can be connected to an external pumping structure, so that the coolant can circulate through the cooling channel 140. At least a portion of the cavity 111 of the housing 100 is surrounded by the cooling channel 140, so that the cooling channel 140 can be adjacent to the inner wall of the cavity 111. Accordingly, at least a portion of the battery cell 200 in the cavity 111 can also be surrounded by the cooling channel 140. When the battery cell 200 disposed in the cavity 111 generates heat during operation, the heat can be conducted to the inner wall of the cavity 111, so that the heat can be absorbed by the coolant, thereby reducing the temperature of the battery cell 200.

[0051] Specifically, the cavity 111 and the cooling channel 140 of the housing 100 are both cavity structures in the housing 100. The cavity 111 and the cooling channel 140 are separated by the physical structure of the housing 100, so that the cavity 111 and the cooling channel 140 can accommodate the battery cell 200 and the coolant respectively. The heat generated during the operation of the battery cell 200 can be transferred to the coolant through the physical structure between the cavity 111 and the cooling channel 140, so that the heat of the battery cell 200 can be taken out by the coolant.

[0052] The coolant circulates in the cooling channel 140 of the shell 100 so that the heat of the battery cell 200 can be taken out of the shell 100. A heat dissipation device such as a fan can be set outside the shell 100. The fan can dissipate heat from the coolant that has absorbed the heat of the battery cell 200, so that the temperature of the coolant is reduced. In this way, the coolant circulates to the cooling channel 140 of the shell 100 again and can absorb the heat generated by the battery cell 200 again.

[0053] The shell 100 can be an injection molded part, so that the shell 100 as a whole can be integrally formed through the injection molding process, so that the preparation process of the shell 100 is relatively simpler, thereby reducing the preparation cost of the shell 100, and further reducing the preparation cost of the battery pack of the present application. Specifically, after the shell 100 is prepared through the injection molding process, the shell 100 can be formed in one step, so that all parts of the shell 100 are an integral structure, so that the structural strength of the shell 100 is relatively higher. In addition, the shell 100 does not need to be assembled through multiple parts during the preparation process, which reduces the assembly process and avoids tolerances in the assembly process. In this way, the dimensional accuracy of the shell 100 is relatively higher, and the preparation is also more convenient.

[0054] In some embodiments, reference Figures 1 to 4 As shown, the shell 100 can be made of polymer materials, specifically plastic or rubber, so that the shell 100 can be prepared by injection molding process, and the weight of the shell 100 is relatively light, so that the weight of the battery pack of the present application is also relatively light. The shell 100 of the present application can also be provided with an opening, which is connected to the cavity 111 of the shell 100, so that the battery cell 200 can be loaded into the cavity 111 of the shell 100 through the opening. The size of the cavity 111 of the shell 100 is slightly larger than the size of the battery cell 200, so that there is a certain gap between the outer wall of the battery cell 200 and the inner wall of the cavity 111. A thermal conductive adhesive can be filled between the battery cell 200 and the inner wall of the cavity 111, and the thermal conductive adhesive can bond the outer wall of the battery cell 200 to the inner wall of the cavity 111, so that the battery cell 200 is stably and reliably fixed in the cavity 111. The thermal conductive adhesive has good thermal conductivity. The heat generated during the operation of the battery cell 200 can be conducted to the inner wall of the cavity 111 through the thermal conductive adhesive, and then conducted to the coolant in the cooling channel 140, so that the heat of the battery cell 200 can be absorbed by the coolant.

[0055] Specifically, when assembling the battery pack of the present application, the battery cell 200 can be first loaded into the cavity 111 of the shell 100, and then thermal conductive glue is filled between the outer wall of the battery cell 200 and the inner wall of the cavity 111, so that the process of assembling the battery cell 200 into the cavity 111 of the shell 100 is relatively simple.

[0056] In some embodiments, reference Figure 1 As shown, when the battery cell 200 of the present application is located in the cavity 111 of the housing 100, the side wall of the battery cell 200 can be arranged to be opposite to the inner wall of the cavity 111. Specifically, the battery cell 200 can adopt a cylindrical battery cell 200 structure, so that the battery cell 200 of the battery cell 200 is a cylinder, the cavity shape of the cavity 111 of the housing 100 can also be set to a cylindrical structure, and the circumferential side wall of the battery cell 200 can be opposite to the inner wall of the cavity 111.

[0057] The cooling channel 140 in the housing 100 can be set to completely or nearly completely surround the cavity 111, and the depth of the cavity 111 of the housing 100 can be set to match the axial height of the battery cell 200, so that the battery cell 200 can be completely or nearly completely accommodated in the cavity 111. In this way, the area of ​​the battery cell 200 relative to the inner wall of the cavity 111 is larger, so that the heat generated during the operation of the battery cell 200 can be more fully conducted to the housing 100, and then conducted to the coolant in the cooling channel 140, so that the temperature of the battery cell 200 during operation is relatively lower.

[0058] In some embodiments, reference Figures 1 to 4 As shown, the number of battery cells 200 of the present application can be set to multiple, and accordingly, the number of cavities 111 in the shell 100 can also be set to multiple. Multiple battery cells 200 can be respectively arranged in multiple cavities 111 of the shell 100, so that multiple battery cells 200 can be fixed on the shell 100. The cooling channel 140 in the shell 100 can be arranged around the multiple cavities 111, so that the heat of the battery cell 200 in each cavity 111 can be conducted to the coolant in the cooling channel 140, and brought out of the shell 100 by the coolant. Multiple battery cells 200 can be electrically connected to each other, so that by setting multiple battery cells 200, the battery pack of the present application can provide more sufficient electric energy, and the battery pack has a higher degree of integration, and the battery pack can be applied in a wider range of scenarios.

[0059] In addition, in other embodiments, a plurality of battery cells 200 may be arranged in one cavity 111 of the housing 100, and the plurality of battery cells 200 in the cavity 111 may be arranged along the circumference of the cavity 111, so that part of the side walls of the plurality of battery cells 200 may be opposite to the inner side wall of the cavity 111. By arranging a plurality of battery cells 200 in each cavity 111 of the housing 100, the number of battery cells 200 of the battery pack of the present application may be further increased, thereby further increasing the power of the battery pack.

[0060] In some embodiments, reference Figure 2 and Figure 4As shown, the multiple cavities 111 of the shell 100 can be arranged along the first direction, so that the multiple cavities 111 can be distributed in the shell 100 in an orderly manner, and the first direction is the X direction in the figure. The multiple cavities 111 arranged along the first direction can form a cavity group 110, and the number of cavity groups 110 can also be set to multiple. The multiple cavity groups 110 can be arranged along the second direction, and the second direction is the Y direction in the figure. Among them, the first direction and the second direction are arranged to intersect, specifically, the first direction and the second direction can be arranged vertically, so that the multiple cavities 111 can be distributed along the first direction and can be distributed along the second direction, so that the number of cavities 111 in the shell 100 is more, so that the shell 100 can accommodate more installed battery cells 200, so that the power of the battery pack of the present application is further improved.

[0061] Specifically, the first direction can be set to be consistent with the length direction of the shell 100, and the second direction can be set to be consistent with the width direction of the shell 100. The shell 100 can adopt a rectangular structure, so that multiple cavities 111 can be arranged in an array on the shell 100.

[0062] In some embodiments, reference Figures 1 to 4 As shown, the cooling channel 140 in the housing 100 can be configured to include a plurality of cooling sub-channels 141, and the plurality of cooling sub-channels 141 can be arranged in communication, so that the coolant can flow through the plurality of cooling sub-channels 141. The number of cooling sub-channels 141 can be arranged to match the number of cavities 111 of the housing 100, so that the plurality of cooling sub-channels 141 can be arranged around the plurality of cavities 111 in a one-to-one correspondence, so that the heat of the plurality of battery cells 200 can be absorbed by the coolant in the cooling sub-channels 141.

[0063] In addition, in other embodiments, multiple cooling sub-channels 141 can also be independently arranged, and the multiple cooling sub-channels 141 can be connected to the liquid inlet 120 and the liquid outlet 130 of the shell 100, so that multiple streams of coolant can enter the multiple cooling sub-channels 141 respectively. In this way, the coolant in the multiple cooling sub-channels 141 can fully dissipate the heat of the battery cells 200 in the multiple cavities 111 respectively, so that the heat dissipation effect of the battery cells 200 is better.

[0064] In some embodiments, reference Figures 1 to 4As shown, when the multiple cavities 111 in the housing 100 are distributed along the first direction and the second direction, the multiple cooling sub-channels 141 can also be distributed along the first direction and the second direction, so that the multiple cooling liquid sub-channels can be arranged in one-to-one correspondence with the multiple cavities 111. The multiple cooling sub-channels 141 corresponding to the multiple cavities 111 in the cavity group 110 can be connected and arranged. Specifically, the multiple cooling sub-channels 141 distributed along the first direction can be connected end to end in sequence along the first direction, so that a stream of cooling liquid can pass through the multiple cooling sub-channels 141 distributed along the first direction in sequence, so that the battery cells 200 in the multiple cavities 111 in the cavity group 110 can all dissipate heat.

[0065] The cooling sub-channels 141 corresponding to the multiple cavities 111 in the other cavity groups 110 are also connected and arranged in sequence along the first direction. Specifically, the multiple cooling sub-channels 141 corresponding to the multiple cavities 111 in the cavity group 110 can constitute a cooling sub-channel group, and the number of cooling sub-channel groups is also multiple and corresponds to the number of cavity groups 110. The multiple cooling sub-channel groups are all connected with the liquid inlet 120 and the liquid outlet 130 of the shell 100. After the external coolant enters from the liquid inlet 120 of the shell 100, it can be diverted to the multiple cooling sub-channel groups, so that coolant passes through each cooling sub-channel 141 to absorb the heat of the corresponding battery cell 200. In this way, multiple streams of coolant dissipate heat to the battery cells 200 in the multiple cavity groups 110 respectively, so that the multiple battery cells 200 can have a better heat dissipation effect.

[0066] In addition, the inner diameter of the opening on the cooling sub-channel 141 adjacent to the liquid inlet 120 and connected to the liquid inlet 120 can be set to be relatively small, and the inner diameter of the opening on the cooling sub-channel 141 away from the liquid inlet 120 and connected to the liquid inlet 120 can be set to be relatively large. In this way, the coolant flow rate in each cooling sub-channel group can be more consistent, so that the heat dissipation effect of the battery cells 200 in each cavity group 110 is more consistent, so as to avoid the local temperature of the battery pack of the present application being too high or too low.

[0067] The inner diameter of the opening on the cooling sub-channel 141 adjacent to the liquid outlet 130 and connected to the liquid outlet 130 can be set to be relatively small, and the inner diameter of the opening on the cooling sub-channel 141 away from the liquid outlet 130 and connected to the liquid outlet 130 can be set to be relatively large. In this way, the coolant flow rate in each cooling sub-channel group can be more consistent, so that the heat dissipation effect of the battery cells 200 in each cavity group 110 is more consistent, so as to avoid the local temperature of the battery pack of the present application being too high or too low.

[0068] Of course, in other embodiments, a temperature sensor may be provided to detect the temperature of multiple battery cells 200, and accordingly, the size of the opening of the cooling sub-channel group connected to the liquid inlet 120 and the liquid outlet 130 is set to an adjustable structure. In this way, when the temperature sensor detects that the temperature of some battery cells 200 is relatively high and the temperature of other battery cells 200 is relatively low, the flow rate of the coolant in each cooling sub-channel group can be controlled by adjusting the size of the inner diameter of the opening of each cooling sub-channel 141 connected to the liquid inlet 120 and the liquid outlet 130. Specifically, the flow rate of the coolant in the cooling sub-channel group corresponding to the battery cell 200 with a relatively high temperature can be set relatively large, and the flow rate of the coolant in the cooling sub-channel group corresponding to the battery cell 200 with a relatively low temperature can be set relatively low, which can save the amount of coolant used, making the operating cost of the battery pack of the present application lower.

[0069] In some embodiments, reference Figures 1 to 4 As shown, the number of the liquid inlet 120 and the liquid outlet 130 on the housing 100 can also be set to multiple, and the number of the multiple liquid inlets 120 and the multiple liquid outlets 130 can be set to be consistent, so that the multiple liquid inlets 120 and the multiple liquid outlets 130 can correspond to each other one by one. Among them, any one of the liquid inlets 120 and any one of the liquid outlets 130 can be connected to at least one cooling sub-channel 141, so that the coolant can enter the housing 100 through the multiple liquid inlets 120 respectively, and be discharged through the multiple liquid outlets 130 respectively, so that the heat dissipation effect of the battery cell 200 in the cavity 111 corresponding to each cooling sub-channel 141 is relatively consistent.

[0070] Specifically, the liquid inlet 120 and the liquid outlet 130 of the shell 100 can be connected to at least one cooling sub-channel group. In this embodiment, a corresponding liquid inlet 120 and a corresponding liquid outlet 130 can be connected to two cooling sub-channel groups at the same time.

[0071] In some embodiments, reference Figure 2 , Figure 4 , Figure 5 and Fig. 9As shown, the shell 100 of the present application can be configured to include an outer shell 150 and a plurality of cooling blocks 160. Among them, the plurality of cooling blocks 160 can be arranged in the outer shell 150, and the plurality of cavities 111 and the plurality of cooling sub-channels 141 can be arranged in the plurality of cooling blocks 160 in a one-to-one correspondence. Specifically, the cooling block 160 is a physical structure in the outer shell 150, the cavity 111 is a cavity structure arranged in the middle part of the cooling block 160, and the cooling sub-channel 141 is an inner cavity structure arranged inside the cooling block 160 and located at the outer edge of the cooling block 160, so that the cooling sub-channel 141 can surround the cavity 111. A gap can be provided between adjacent cooling blocks 160, and the gap is a demolding cavity 190. Specifically, the demolding cavity 190 and the cavity 111 are located on opposite sides of the cooling sub-channel 141. The inner wall of the demolding cavity 190 can make the area of ​​the shell 100 in contact with the external air larger. After the heat generated during the operation of the battery cell 200 is absorbed by the coolant in the cooling sub-channel 141, part of the heat can also be dissipated through the demolding cavity 190, thereby making the heat dissipation effect of the battery pack of the present application better.

[0072] Among the multiple cavities 111 of the housing 100, adjacent cavities 111 can be connected through a connecting port 111b, and the connecting port 111b can be specifically set to extend along the axial direction of the cavity 110. The specific connecting port 111b can be a disconnected structure on the cooling block 160. By providing the connecting port 111b and the housing 100 using a polymer material, the housing 100 can be subjected to a greater deformation amplitude under stress, so that the battery cell 200 can be more conveniently installed in the cavity 111 of the housing 100. In addition, by providing the connecting port 111b on the housing 100, the amount of injection molding raw materials used when the housing 100 is prepared by an injection molding process can be reduced, thereby reducing the cost of the battery pack.

[0073] In some embodiments, reference Figure 5 and Figure 6 As shown, the shell 100 of the present application may also be provided with a reinforcing protrusion 170, wherein the reinforcing protrusion 170 may be provided on the outer wall of the cooling block 160, and the reinforcing protrusion 170 may enhance the structural strength of the cooling block 160, thereby making the structural strength of the shell 100 better, and ultimately making the structure of the battery pack of the present application more stable and reliable.

[0074] Specifically, the reinforcing protrusion 170 is a protruding structure extending on the outer wall of the cooling block 160 in a direction away from the cooling block 160, and the reinforcing protrusion 170 can be set as a curved surface structure. The number of reinforcing protrusions 170 can be set to multiple, and multiple reinforcing protrusions 170 can be set along the circumference of the cooling block 160. In this embodiment, the number of reinforcing protrusions 170 can be set to two, and the two reinforcing protrusions 170 can be set on opposite sides of the cooling block 160. The reinforcing protrusion 170 and the cooling block 160 are also an integral structure, and the housing 150, the cooling block 160 and the reinforcing protrusion 170 are integrally formed by an injection molding process.

[0075] In some embodiments, reference Figure 6 and Fig. 9 As shown, the housing 100 of the present application also has a partition 180, which is a physical structure in the housing 100. The partition 180 is located between the cooling channel 140 and the cavity 111 of the housing 100 to separate the cooling channel 140 and the cavity 111, so that the cooling channel 140 and the cavity 111 of the housing 100 are located on opposite sides of the partition 180. The thickness of the partition 180 can be set to 1mm-4mm, so that the partition 180 can be easily processed when the size is relatively compact, the internal space of the housing 100 occupied by the partition 180 is relatively smaller, and the number of battery cells 200 that can be accommodated in the housing 100 is more, so that the battery pack of the present application can integrate more battery cells 200. The thinner the partition 180 is, the more efficiently the heat of the battery cells 200 in the cavity 111 can be transferred to the coolant in the cooling channel 140 through the partition 180.

[0076] In some embodiments, reference Figure 7 and Figure 8 As shown, the battery pack of the present application may also be provided with a bottom plate 300, wherein the housing 100 may be provided on the bottom plate 300, so that the bottom plate 300 can bear and support the housing 100, thereby making the structure of the battery pack further stable and reliable. The housing 100 may be provided with a first gas outlet 111a, the first gas outlet 111a being connected to the cavity 111, and the bottom plate 300 may be provided with a second gas outlet 310, the second gas outlet 310 may be arranged opposite to and connected to the first gas outlet 111a, so that the gas generated after the exhaust of the battery cell 200 can be discharged through the first gas outlet 111a of the housing 100 and the second gas outlet 310 of the bottom plate 300, thereby preventing the gas from accumulating in the cavity 111 of the housing 100.

[0077] Specifically, the first air outlet 111a of the housing 100 is opened on the side of the cavity 111 facing away from the open side of the cavity 111, so that the first air outlet 111a is located at the bottom of the cavity 111, and the bottom plate 300 is also arranged at the bottom of the housing 100, so that the first air outlet 111a and the second air outlet 310 can be arranged correspondingly. The bottom plate 300 and the housing 100 can be connected by welding technology, so that the fixed connection effect of the bottom plate 300 and the housing 100 is more stable and reliable.

[0078] 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 housing (100) having a cavity (111); the housing (100) is further provided with a liquid inlet (120), a liquid outlet (130) and a cooling channel (140); the cooling channel (140) is in communication with the liquid inlet (120) and the liquid outlet (130); at least a portion of the cavity (111) is surrounded by the cooling channel (140); A battery cell (200) is disposed in the cavity (111); Wherein, the housing (100) is an injection molded part.

2. The battery pack according to claim 1, characterized in that: The side wall of the battery core (200) is opposite to the inner wall of the cavity (111), and the cooling channel (140) is arranged around the inner wall of the cavity (111).

3. The battery pack according to claim 2, characterized in that: Thermally conductive glue is filled between the side wall of the battery core (200) and the inner wall of the cavity (111).

4. The battery pack according to claim 3, characterized in that: The number of the containing cavities (111) and the number of the battery cells (200) are both multiple, and the multiple battery cells (200) are arranged in the multiple containing cavities (111); The cooling flow channel (140) comprises a plurality of cooling sub-flow channels (141), and the plurality of cooling sub-flow channels (141) are arranged around the plurality of cavities (111) in a one-to-one correspondence.

5. The battery pack according to claim 4, characterized in that: The multiple cavities are divided into multiple cavity groups, the multiple cavities in each cavity group are arranged along a first direction, and the multiple cavity groups are arranged along a second direction, and the first direction is perpendicular to the second direction.

6. The battery pack according to claim 5, characterized in that: The plurality of cooling sub-channels (141) corresponding to the plurality of cavities (111) in the cavity group (110) are sequentially connected along the first direction.

7. The battery pack according to claim 4, characterized in that: There are a plurality of the liquid inlets (120) and the liquid outlets (130), and any one of the liquid inlets (120) and any one of the liquid outlets (130) is in communication with at least one of the cooling sub-channels (141).

8. The battery pack according to any one of claims 4 to 7, characterized in that: The shell (100) includes an outer shell (150) and a plurality of cooling blocks (160), wherein the plurality of cooling blocks (160) are arranged in the outer shell (150), the plurality of cavities (111) and the plurality of cooling sub-channels (141) are arranged in a one-to-one correspondence in the plurality of cooling blocks (160), and there is a gap between adjacent cooling blocks (160).

9. The battery pack according to claim 8, characterized in that: The housing (100) further comprises a reinforcing protrusion (170), wherein the reinforcing protrusion (170) is arranged on the outer wall of the cooling block (160).

10. The battery pack according to any one of claims 1 to 7, characterized in that: The housing (100) has a partition (180) located between the cooling channel (140) and the cavity (111), and the thickness of the partition (180) is 1 mm to 4 mm.

11. The battery pack according to any one of claims 1 to 7, characterized in that: It also includes a bottom plate (300), the shell (100) is arranged on the bottom plate (300), the shell (100) is provided with a first air outlet (111a) connected to the cavity (111), the bottom plate (300) is provided with a second air outlet (310), and the first air outlet (111a) is connected to the second air outlet (310).

12. The battery pack according to any one of claims 1 to 7, characterized in that: The housing (100) is made of a polymer material.

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