CN111864310A

CN111864310A - Battery pack and cold plate thereof

Info

Publication number: CN111864310A
Application number: CN202010900094.3A
Authority: CN
Inventors: 蒋碧文
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2020-08-31
Filing date: 2020-08-31
Publication date: 2020-10-30

Abstract

The invention discloses a battery pack and a cold plate thereof. In the invention, a cold plate of a cold plate battery pack of the battery pack is provided with a main inlet channel for cooling medium to flow in, a main outlet channel for cooling medium to flow out and a plurality of cooling modules for communicating the main inlet channel and the main outlet channel, and the cooling modules are connected in parallel; each cooling module is provided with a plurality of cooling sub-modules connected in series, and each cooling sub-module is provided with a fluid channel; wherein at least part of the cooling submodule is provided with a plurality of parallel fluid channels, and the inlets of at least part of the fluid channels are provided with protruding parts. Compared with the prior art, the battery pack has the advantage that the heat dissipation is uniform.

Description

Battery pack and cold plate thereof

Technical Field

The invention relates to the field of batteries, in particular to a battery pack and a cold plate thereof.

Background

The battery pack includes a bottom plate, a plurality of battery modules placed on the bottom plate, an outer frame surrounding the battery modules, and a top plate. The battery module is fixed on the bottom plate, and the frame is fixed mutually with the bottom plate, and roof and bottom plate set up relatively, and the roof is together fixed with the frame. A plurality of electric cores have been placed again in the battery module, and in the battery package work, electric core meeting long-term generating heat, and the electric core heat adjacent with each side of battery package can have the part to scatter in the battery module, but the heat that is located central area electricity core is difficult to scatter, and the battery package is in the work under the high temperature for a long time, will influence the life of battery package, and has the potential safety hazard. In addition, when the battery pack is placed in an automobile for use, peripheral parts of the automobile can be affected due to overhigh temperature of the battery pack, the automobile can be operated in a high-temperature environment all the time, the safety is poor, and the service lives of other parts of the automobile are also affected.

In order to realize heat dissipation of the battery pack, a cold plate is arranged between the battery module and the bottom plate, and a cooling medium circularly flows in the cold plate and conducts heat of the battery module to dissipate the heat. But cooling medium flows in from the entry of cold drawing in the current cold drawing, then forms one and flows to the opposite side from one side of cold drawing, but this kind of circulation mode can let the battery module that the cold drawing entrance corresponds obtain the school heat dissipation, but the radiating effect is not good in other places, leads to the whole heat dissipation of battery package inhomogeneous, and then when the battery package was used in the car for the local temperature of car risees, causes the potential safety hazard.

Disclosure of Invention

The invention aims to provide a battery pack and a cold plate thereof, so that the battery pack has uniform heat dissipation and is safer and more reliable to use.

In order to solve the technical problem, an embodiment of the present invention provides a cold plate of a battery pack, wherein a main inlet channel for a cooling medium to flow in, a main outlet channel for a cooling medium to flow out, and a plurality of cooling modules communicating the main inlet channel and the main outlet channel are formed on the cold plate of the battery pack, and the cooling modules are connected in parallel;

each cooling module having a plurality of cooling sub-modules connected in series therein, each cooling sub-module having a fluid passage therein; wherein at least part of the cooling sub-modules are provided with a plurality of parallel fluid channels, and the inlets of at least part of the fluid channels are provided with protruding pieces.

The embodiment of the invention also provides a battery pack, which comprises the cold plate and a battery module arranged on the cold plate, wherein the battery module is provided with a plurality of battery cores.

Compared with the prior art, the battery module cooling system is provided with the main inlet channel, the main outlet channel and the plurality of cooling modules, the cooling modules are connected in parallel, the cooling medium enters the main inlet channel, is shunted in the main inlet channel and enters the cooling modules, and flows in the cooling modules to dissipate heat of the battery modules corresponding to the cooling modules. Each cooling module is also provided with a plurality of cooling sub-modules which are connected in series, each cooling sub-module is provided with a fluid channel, a protruding part is arranged at the inlet of the fluid channel, and the cooling medium in each cooling module is divided by the protruding part when passing through the protruding part, so that the cooling medium can uniformly flow into each fluid channel. The cooling medium flows out of the cooling modules, so that a proper amount of cooling medium flows through each area in each cooling module, and the battery modules corresponding to the cooling modules can be better cooled. And then realize making the battery package heat dissipation even, improve the life-span of battery package, use also safer. When the battery pack is used in an automobile, peripheral parts of the battery pack cannot be influenced by the battery pack, and the automobile has a safe operation environment.

In one embodiment, the cooling modules are sequentially arranged along a preset direction; the main inlet channel and the main outlet channel extend along the arrangement direction of the cooling modules and are positioned at two sides of the cooling modules;

each cooling module is provided with a module inlet communicated with the main inlet channel and a module outlet communicated with the main outlet channel; wherein the inlets of the modules are positioned on the same side and arranged along the extending direction of the total access passage; wherein the module outlets are located on the same side and arranged along the extending direction of the main outlet channel.

In one embodiment, each cooling submodule has a sub-inlet channel communicated with the inlet of the fluid channel in the cooling submodule and a sub-outlet channel communicated with the outlet of the fluid channel in the cooling submodule; the sub-inlet channel and the sub-outlet channel in each cooling submodule are respectively arranged on two sides of the fluid channel in the cooling submodule;

the sub-inlet channel of one cooling sub-module in each cooling module is communicated with the module inlet, and the sub-outlet channel of the other cooling sub-module in each cooling module is communicated with the module outlet;

the protruding pieces corresponding to the fluid channels are arranged in the sub-access channels of the cooling sub-module where the fluid channels are located, and the protruding pieces are arranged opposite to the inlets of the fluid channels.

In one embodiment, the protrusion is spaced apart from a sidewall of the sub-access passage in which it is located.

In one embodiment, each of the fluid passages includes a first sidewall and a second sidewall spaced apart from each other to form a cavity through which the cooling medium passes;

the first side wall comprises a first head end and a first tail end opposite to the first head end, and the second side wall comprises a second head end and a second tail end opposite to the second head end; said first head end and said second head end being spaced apart from each other to form an inlet of said fluid passageway and said first tail end and said second tail end being spaced apart from each other to form an outlet of said fluid passageway;

the width of the protruding part corresponding to each fluid channel is smaller than the distance from the first head end to the second head end in the fluid channel.

In one embodiment, a flow distribution protrusion is disposed at the module inlet, and the flow distribution protrusion is located in a sub-access passage communicated with the module inlet.

In an embodiment, the shunting protrusion is a circular truncated cone and is spaced from the protrusion piece in the access passage where the shunting protrusion is located.

In an embodiment, the protruding member is a circular truncated cone.

In one embodiment, an inlet protrusion is disposed at an inlet of the main access passage, and the inlet protrusion is spaced apart from a sidewall of the main access passage.

In one embodiment, the fluid passages are arranged in parallel.

In one embodiment, the tube diameter of the total access channel gradually increases in the direction of flow of the cooling medium therein.

Drawings

Fig. 1 is a schematic view illustrating a structure in which a battery module is placed on a cold plate according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the internal structure of a cold plate illustrating a cooling submodule in an embodiment of the present invention;

FIG. 3 is a schematic view of the internal structure of a cold plate illustrating fluid passages in an embodiment of the present invention;

FIG. 4 is a schematic diagram of a cooling module according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a cooling submodule in a cooling module in accordance with an embodiment of the present invention;

fig. 6 is a schematic view of the internal structure of a cold plate provided with inlet projections in an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising," are to be understood as an open, inclusive meaning, i.e., as being interpreted to mean "including, but not limited to," unless the context requires otherwise.

The embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are merely intended to illustrate the spirit of the technical solution of the present invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the purposes of clearly illustrating the structure and operation of the present invention, directional terms will be used, but terms such as "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be construed as words of convenience and should not be construed as limiting terms.

Embodiments of the present invention are described below with reference to the drawings. As shown in fig. 1 and 2, the battery pack includes: the cold plate 7, arrange the battery module 8 that sets up on the cold plate 7, have a plurality of electric cores in the battery module 8. As shown in fig. 2, a main inlet channel 4 for the inflow of the cooling medium, a main outlet channel 5 for the outflow of the cooling medium, and a plurality of cooling modules communicating the main inlet channel 4 and the main outlet channel 5 are disposed on the cold plate 7, and the cooling modules are connected in parallel. Each cooling module is provided with a plurality of cooling sub-modules connected in series, each cooling sub-module is provided with a fluid channel, and at least the inlet of the fluid channel is provided with a protruding piece. The cold plate 7 comprises an upper plate and a lower plate, a total inlet channel 4, a total outlet channel 5 and a cooling module are formed between the upper plate and the lower plate, and a cooling medium enters the total inlet channel 4 from the space between the upper plate and the lower plate and then flows out from the space between the upper plate and the lower plate.

Specifically, as shown in fig. 2 and 3, three cooling modules are disposed on the cold plate 7, which are respectively a cooling module 1, a cooling module 2, and a cooling module 3 sequentially arranged, the cooling module 1 has a module inlet 10 communicating with the main inlet and a module outlet 100 communicating with the main outlet 5, the cooling module 2 has a module inlet 20 communicating with the main inlet and a module outlet 200 communicating with the main outlet 5, the cooling module 3 has a module inlet 30 communicating with the main inlet and a module outlet 300 communicating with the main outlet 5, the module inlet 10, the module inlet 20, and the module inlet 30 are disposed on the same side and arranged along the extending direction of the main inlet 4, and the module outlet 100, the module outlet 200, and the module outlet 300 are disposed on the same side and arranged along the extending direction of the main outlet 5. That is, each cooling module has a module inlet communicating with the main inlet channel 4 and a module outlet communicating with the main outlet channel 5, the module inlets are located on the same side and arranged along the extending direction of the main inlet channel 4, and the module outlets are located on the same side and arranged along the extending direction of the main outlet channel 5.

In addition, as shown in fig. 2 and 3, three cooling submodules connected in series are provided in each of the cooling module 1, the cooling module 2, and the cooling module 3. Taking the cooling module 1 as an example, the cooling module 1 has a cooling sub-module 11, a cooling sub-module 12, and a cooling sub-module 13, the cooling sub-module 11, the cooling sub-module 12, and the cooling sub-module 13 all have fluid passages therein, a plurality of or one fluid passage in each cooling sub-module may be provided, and when a plurality of fluid passages in each cooling sub-module are provided, the fluid passages may be connected in parallel or in series. When one of the fluid channels in the cooling submodule is provided, the inlet of the fluid channel may be free of projections. When a plurality of fluid passages are arranged in the cooling submodule, the convex parts can be arranged at the inlets of part of the fluid passages, and the convex parts can be arranged at the inlets of all the fluid passages.

According to the above, since the cold plate 7 is provided with the main inlet channel 4, the main outlet channel 5 and the plurality of cooling modules, and the cooling modules are connected in parallel, the cooling medium enters the main inlet channel 4, is shunted in the main inlet channel 4 and enters the cooling modules, and flows in the cooling modules to dissipate heat of the battery modules 8 corresponding to the cooling modules. Each cooling module is also provided with a plurality of cooling sub-modules which are connected in series, each cooling sub-module is provided with a fluid channel, a protruding part is arranged at the inlet of the fluid channel, and the cooling medium in each cooling module is divided by the protruding part when passing through the protruding part, so that the cooling medium can uniformly flow into each fluid channel. The cooling medium flows out of the cooling modules, so that a proper amount of cooling medium flows through each area in each cooling module, and the battery modules corresponding to the cooling modules can be better cooled. And then realize making the battery package heat dissipation even, improve the life-span of battery package, use also safer. When the battery pack is used in an automobile, peripheral parts of the battery pack cannot be influenced by the battery pack, and the automobile has a safe operation environment.

Further, each cooling submodule has a plurality of parallel fluid channels therein. As shown in fig. 2 and fig. 3, the structural layout of each cooling module is the same, taking the cooling module 1 as an example, the cooling submodule 11 has a fluid channel 111, a fluid channel 112, a fluid channel 113 and a fluid channel 114 connected in parallel, the cooling submodule 12 has a fluid channel 121, a fluid channel 122, a fluid channel 123 and a fluid channel 124 connected in parallel, and the cooling submodule 13 has a fluid channel 131, a fluid channel 132, a fluid channel 133 and a fluid channel 134 connected in parallel, and each fluid channel is arranged in sequence along a preset direction, as shown in the direction of arrow a in the figure. The cooling submodule 11 has a sub-inlet channel 115 and a sub-outlet channel 116, the sub-inlet channel 115 communicates with inlets of the fluid channel 111, the fluid channel 112, the fluid channel 113 and the fluid channel 114, the sub-outlet channel 116 communicates with outlets of the fluid channel 111, the fluid channel 112, the fluid channel 113 and the fluid channel 114, and the sub-inlet channel 115 and the sub-outlet channel 116 are respectively located at two sides of the fluid channel 111, the fluid channel 112, the fluid channel 113 and the fluid channel 114. The sub-inlet channel 115 is connected to the module inlet 10, and the sub-outlet channel 136 is connected to the module outlet 100. The cooling sub-module 12 and the cooling sub-module 13 have the same structure as the cooling sub-module 11, the cooling sub-module 12 has a sub-inlet channel 125 and a sub-outlet channel 126, and the cooling sub-module 13 has a sub-inlet channel 135 and a sub-outlet channel 136, which will not be described in detail herein. It is understood that the module inlet 10 may communicate with the sub-inlet channel 125 of the cooling sub-module 12, and the module outlet 100 may communicate with the sub-outlet channel 136 of the cooling sub-module 13, which is not limited herein. Likewise, the module inlet 20 and the module outlet 200 may also communicate with different cooling submodules in the cooling module 2. The module inlet 30 and the module outlet 300 may also communicate with different cooling sub-modules in the cooling module 3.

Specifically, as shown in fig. 2 and 3, the arrow B indicates the flowing direction of the cooling medium, and the cooling medium may be water or coolant, which flows into the sub-inlet channel 115 through the module inlet 10 from the main inlet channel 4, flows into the

fluid channels

111, 112, 113 and 114 from the sub-inlet channel 115, flows out of the

fluid channels

111, 112, 113 and 114 into the sub-outlet channel 116, flows into the sub-inlet channel 125 through the sub-outlet channel 116, flows into the

fluid channels

121, 122, 123 and 124 from the sub-inlet channel 125, flows out of the

fluid channels

121, 122, 123 and 124 into the sub-outlet channel 126, flows into the sub-inlet channel 135 from the sub-outlet channel 126, flows into the

fluid channels

131, 114 from the sub-inlet channel 135, Fluid channel 132, fluid channel 133, and fluid channel 134 flow from fluid channel 131, fluid channel 132, fluid channel 133, and fluid channel 134 into sub-egress channel 136, and finally out of module outlet 100 to main egress channel 5 and out of main egress channel 5. In the same manner as the flow path described above, the cooling medium in the inlet main channel 4 enters the cooling module 2 through the module inlet 20, enters the cooling module 3 through the module inlet 30, and flows out of the module outlet 200 and the module outlet 300 into the outlet main channel 5. Thereby after cooling medium got into each cooling submodule piece, but the reposition of redundant personnel flows to a plurality of circulation passageways simultaneously, lets a plurality of regions have cooling medium to flow through simultaneously in the cold plate for the battery module that the cold plate corresponds can be better obtains the heat dissipation.

In addition, the protruding piece corresponding to each fluid channel is arranged in the sub-access channel of the cooling sub-module where the fluid channel is located, and the protruding piece is arranged opposite to the inlet of the fluid channel. Specifically, as shown in fig. 3 and 4, taking the cooling module 1 as an example, the protrusion 91 and the protrusion 92 are provided in the sub-passage 115, the protrusion 91 is provided opposite to the inlet of the fluid passage 112, and the protrusion 92 is provided opposite to the inlet of the fluid passage 113. And the protrusion 91 and the protrusion 92 are spaced from the side wall of the sub-passage 115, so that when the cooling medium flows in the sub-passage 115, the part of the cooling medium divided by the protrusion 91 flows downwards in the direction of the fluid passage 111, the other part of the cooling medium flows upwards, the protrusion 92 divides the cooling medium flowing upwards again, and the side surface of the protrusion 92 forms a guide surface to allow the cooling medium to flow into the fluid passage 112, the fluid passage 113 and the fluid passage 114 more uniformly. The sub-inlet passage 125 is provided with a protrusion 93, a protrusion 94 and a protrusion 95, the protrusion 93, the protrusion 94 and the protrusion 95 are all separated from the side wall of the sub-inlet passage 125, the protrusion 93 is arranged opposite to the inlet of the fluid passage 121, the protrusion 94 is arranged opposite to the inlet of the fluid passage 122, and the protrusion 95 is arranged opposite to the inlet of the fluid passage 123. The protrusion 93 divides the cooling medium in the sub-passage 125 into the fluid passage 121, the protrusion 94 flows the divided portion of the cooling medium into the fluid passage 122, the protrusion 95 flows the divided portion of the cooling medium into the fluid passage 123, and the remaining cooling medium flows into the fluid passage 124. The sub access passage 135 is provided with a projection 96, a projection 97, and a projection 98, and the projection 96, the projection 97, and the projection 98 are spaced apart from the side wall of the sub access passage 135. The projection 96 is disposed opposite the inlet of the fluid channel 131, the projection 97 is disposed opposite the inlet of the fluid channel 132, and the projection 98 is disposed opposite the inlet of the fluid channel 133. The protrusion 96 divides the cooling medium in the sub-passage 135 into the fluid passage 131, the protrusion 97 flows the cooling medium divided portion into the fluid passage 132, the protrusion 98 flows the cooling medium divided portion into the fluid passage 133, and the remaining cooling medium flows into the fluid passage 134. When the projections are required to be arranged correspondingly to the fluid passages in the

cooling modules

2 and 3, the projections are arranged in the same way as in the cooling module 1, and will not be described in detail. Through the arrangement of the protruding parts, the cooling medium entering each fluid channel from the sub-inlet channel can uniformly enter each fluid channel, so that the cooling medium uniformly circulates everywhere on the cold plate, and the heat dissipation effect of the battery module is better.

In addition, the structures of the respective fluid passages are the same, and as shown in fig. 3, 4, and 5, taking the fluid passage 133 as an example, the fluid passage 133 includes a first side wall 1331 and a second side wall 1332, and the first side wall 1331 and the second side wall 1332 are spaced apart from each other to form a cavity through which the cooling medium passes. First side wall 1331 includes a first head end 13311 and a first aft end 13312 disposed opposite first head end 13311, and second side wall 1332 includes a second head end 13321 and a second aft end 13322 disposed opposite second head end 13321, first head end 13311 and second head end 13321 being spaced apart from one another to form an inlet to fluid passageway 133, and first aft end 13312 and second aft end 13322 being spaced apart from one another to form an outlet to fluid passageway 133. The width of the projection 98 is less than the distance from the first head end 13311 to the second head end 13321. The same may be true for the width of the corresponding projection of the remaining fluid channel.

Optionally, the protruding member is a circular truncated cone, a cylinder or a polygonal prism, and the protruding member and the lower plate of the cold plate can be integrally formed. The side surface of the circular truncated cone is partially provided with an inclined surface which inclines towards the flow channel in the cooling submodule where the circular truncated cone is located. Taking the protrusion 98 as an example, the side surface of the protrusion 98 is a slope inclined toward the fluid channel 133, and the side surface of the protrusion 98 is also a slope inclined toward the fluid channel 132. Thereby guiding the cooling medium toward the fluid passage 122 and the fluid passage 133.

More particularly, a flow distribution protrusion is disposed at the inlet of the module, and the flow distribution protrusion is located in the sub-inlet passage communicated with the inlet of the module. The shunt protrusion is also spaced from the protrusion in the access passage in which it is located. Specifically, as shown in fig. 3 and 4, a diversion protrusion 61 is provided at the module inlet 10, the diversion protrusion 61 is in the sub-passage channel 115 and is spaced apart from the protrusion 91 and the protrusion 92, and the cooling medium is diverted through the diversion protrusion 61 and then the protrusion 91 and the protrusion 92 after entering from the module inlet 10. Similarly, a diverter projection 62 is provided at the module inlet 20. So that the cooling medium can flow into each fluid channel more uniformly.

In addition, each shunt bulge can be a circular truncated cone, a cylinder or a polygonal prism.

Further, as shown in fig. 6, an inlet protrusion 40 is provided at an inlet of the overall inlet passage 4, and the inlet protrusion 40 is spaced apart from a sidewall of the overall inlet passage 4. The inlet bulge can be a circular truncated cone, a cylinder or a polygonal prism, the cooling medium entering the main access passage 4 is firstly divided into two parts by the inlet bulge, one part directly enters the cooling module 1, and the other part flows to the cooling module 2 and the cooling module 3.

Optionally, the fluid channels are arranged in parallel. The fluid channel layout in the cold plate is more regular. The pipe diameter of the main inlet passage 4 gradually increases along the flowing direction of the cooling medium therein, that is, the pipe diameter of the main inlet passage 4 gradually increases from the cooling module 1 to the cooling module 2, so that after the cooling medium enters the cooling module 1 and the cooling module 2, the residual cooling medium can rapidly enter the cooling module 3.

It will be appreciated that the number of cooling modules may be 2, 4 or 5 etc., and that the number of cooling sub-modules in each cooling module may also be 2, 4 or 5 etc. The connection key between the cooling module and the cooling submodule is the same regardless of the number, and the details are not further described here.

Another embodiment of the present invention further relates to a battery pack: the battery module comprises the cold plate 7 and the battery module 8 arranged on the cold plate 7, wherein the battery module 8 is provided with a plurality of battery cores.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. The cold plate of the battery pack is characterized in that a main inlet channel for cooling medium to flow in, a main outlet channel for cooling medium to flow out and a plurality of cooling modules communicated with the main inlet channel and the main outlet channel are arranged on the cold plate of the battery pack, and the cooling modules are connected in parallel;

2. The cold plate of the battery pack of claim 1, wherein the cooling modules are arranged in series along a predetermined direction; the main inlet channel and the main outlet channel extend along the arrangement direction of the cooling modules and are positioned at two sides of the cooling modules;

3. The cold plate of the battery pack of claim 2, wherein each of the cooling sub-modules has a sub-inlet passage therein in communication with an inlet of a fluid passage therein, and a sub-outlet passage therein in communication with an outlet of the fluid passage therein; the sub-inlet channel and the sub-outlet channel in each cooling submodule are respectively arranged on two sides of the fluid channel in the cooling submodule;

4. The cold plate of a battery pack as claimed in claim 3, wherein the protrusion is spaced from the side wall of the sub-access passage in which it is located.

5. The cold plate of the battery pack according to claim 4, wherein each of the fluid passages includes a first sidewall and a second sidewall that are spaced apart from one another to form a cavity through which the cooling medium passes;

6. The cold plate of the battery pack as recited in claim 3, wherein the module inlet is provided with a flow diversion protrusion located in a sub-access passage in communication with the module inlet.

7. The cold plate of the battery pack of claim 6, wherein the shunting projection is frustoconical and spaced apart from the protrusion in the access passage in which it is located.

8. The cold plate of the battery pack of claim 1, wherein the protrusion is a rounded table.

9. The cold plate of a battery pack according to claim 1, wherein the inlet of the overall access passage is provided with an inlet projection, and the inlet projection is spaced from the side wall of the overall access passage.

10. The cold plate of the battery pack of claim 1, wherein the fluid channels are arranged in parallel.

11. The cold plate of the battery pack of claim 1, wherein the tube diameter of the total access passage gradually increases in a direction of flow of the cooling medium therein.

12. A battery pack, characterized by a cold plate according to any one of claims 1 to 11, a battery module arranged on the cold plate, and a plurality of battery cells in the battery module.