CN220491992U

CN220491992U - Battery pack shell and battery pack with same

Info

Publication number: CN220491992U
Application number: CN202322084807.5U
Authority: CN
Inventors: 耿辉; 郭伟; 姚美齐; 高立军
Original assignee: Yancheng Dafeng Csi Energy Storage Technology Co ltd; Atlas Energy Storage Technology Co ltd; Atlas Sunshine Power Group Co Ltd
Current assignee: Yancheng Dafeng Csi Energy Storage Technology Co ltd; Canadian Solar Inc; Atlas Energy Storage Technology Co ltd
Priority date: 2023-08-04
Filing date: 2023-08-04
Publication date: 2024-02-13
Anticipated expiration: 2033-08-04

Abstract

The utility model provides a battery package casing and have its battery package, battery package casing package include the liquid cooling board, connect in the frame of liquid cooling board periphery, the liquid cooling board is including mutually concatenation's top plate and lower plywood, the lower surface of top plate and/or the shaping has the liquid cooling groove on the upper surface of lower plywood, thereby the top plate with constitute the liquid cooling passageway between the lower plywood. The utility model adopts the liquid cooling plate as the bottom plate of the battery pack shell, namely the liquid cooling plate and the bottom plate are combined into a whole, and the liquid cooling channel is positioned in the liquid cooling plate, so that the liquid cooling channel is separated from the battery module, and the damage of liquid leakage to the battery pack is prevented.

Description

Battery pack shell and battery pack with same

Technical Field

The utility model relates to the technical field of energy storage, in particular to a battery pack shell and a battery pack with the same.

Background

Along with the continuous development of economy, energy consumption is increased, the society faces the problems of non-renewable resources exhaustion, serious environmental pollution, climate warming and the like, and the requirements on carbon emission and carbon peak are also urgent, so that the research and development of energy storage technology are more and more emphasized.

Currently, a key technology for restricting the development of an energy storage system is a power battery, and a problem related to battery thermal management is a key factor for determining the service performance, safety, service life and use cost of the power battery. Good thermal management design is critical to ensure good long-lasting operation of the energy storage system.

Energy storage systems in the market generally use an energy storage battery device to store redundant energy, and most of the energy storage battery devices comprise a battery module and a battery pack, so that in order to ensure that the battery can work normally and meet the charge and discharge service life of up to 10 years or even 20 years, the battery pack or an electric core in the battery module needs to be subjected to temperature control management.

At present, an air cooling mode is mainly adopted in the market to carry out temperature management on the battery cell, management energy efficiency is low, a management temperature range is wide, the requirement of the battery cell on temperature is difficult to meet, a corresponding runner design is needed to be made by adopting the air cooling mode, the grouping efficiency and the space utilization rate of the module are low, the space utilization rate of a container is low, and the material cost and the transportation cost are increased. There are also few energy storage batteries adopting a liquid cooling mode in the market, but a cold plate needs to be arranged in a battery pack, so that the possibility of leakage of cooling liquid exists, the risk of thermal runaway of the battery pack is increased, in addition, in view of the cost pressure of an energy storage system, the cost of a shell is generally high at present, the manufacturing process is complex, the liquid cooling airtight performance is difficult to ensure, the production efficiency and the yield are low, and the reworking cost is high.

In view of the foregoing, it is necessary to provide a battery pack case and a battery pack having the same, so as to solve the above-mentioned technical problems.

Disclosure of Invention

The utility model aims to at least solve one of the technical problems in the prior art and provides a battery pack shell and a battery pack with the same.

In order to achieve one of the above purposes, the present utility model adopts the following technical scheme:

the utility model provides a battery package casing, includes the liquid cooling board, connect in the frame of liquid cooling board periphery, the liquid cooling board is including the top plate and the bottom plate of mutual concatenation, the lower surface of top plate and/or the shaping has the liquid cooling groove on the upper surface of bottom plate, thereby the top plate with constitute the liquid cooling passageway between the bottom plate.

Further, the liquid cooling channel comprises a liquid inlet channel, a liquid outlet channel and a plurality of heat exchange channels connected in parallel between the liquid inlet channel and the liquid outlet channel, wherein the liquid inlet channel and the liquid outlet channel are respectively positioned at two sides of the liquid cooling plate in the first direction, and the heat exchange channels are distributed along the second direction perpendicular to the first direction.

Further, the heat exchange channel comprises a liquid inlet branch communicated with the liquid inlet channel, and a liquid outlet branch communicated with the liquid inlet branch and the liquid outlet channel, and the liquid outlet branch is positioned at one side of the liquid inlet branch along the second direction.

Further, the heat exchange channel comprises two liquid outlet branches, and the two liquid outlet branches are respectively positioned at two sides of the liquid inlet branch along the second direction.

Further, the liquid inlet branch extends along the first direction, the liquid outlet branch is U-shaped or serpentine, one end of the liquid inlet branch, which is close to the liquid outlet channel, is communicated with one end of the liquid outlet branch, and the other end of the liquid outlet branch is communicated with the liquid outlet channel.

Further, at least one liquid inlet flow dividing plate extending along the first direction is arranged in the liquid inlet branch;

or, a middle partition plate and at least one flow dividing plate positioned on one side or two sides of the middle partition plate in the liquid inlet branch passage are arranged, and the middle partition plate extends to one end of the liquid inlet branch passage, which is close to the liquid outlet passage.

Further, the heat exchange channels comprise a first heat exchange area channel and a second heat exchange area channel which are distributed along a first direction, the first heat exchange area channel and the second heat exchange area channel are communicated, one of the two heat exchange area channels is communicated with the liquid inlet channel, and the other heat exchange area channel is communicated with the liquid outlet channel.

Further, the first heat exchange area channel comprises a first inflow branch which extends spirally inwards and a first outflow branch which is communicated with the first inflow branch and extends spirally outwards, and the first inflow branch and the first outflow branch are arranged in a double-spiral mode.

Further, the second heat exchange zone passage includes a second inflow leg extending in a second direction, a second outflow leg extending in the second direction, a transition leg connecting the second inflow leg and the second outflow leg; wherein the second inflow branch and the second outflow branch are in a serpentine shape.

Further, the liquid inlet channel and the liquid outlet channel are respectively positioned at two sides of the width of the liquid cooling plate, and a plurality of heat exchange channels are distributed along the length direction of the liquid cooling plate.

Further, the frame is provided with a fixing plate for fixing the liquid cooling plate, the edge of the liquid cooling plate is connected to the lower portion of the fixing plate, and the middle position of the liquid cooling plate is flush with the fixing plate.

Further, the frame includes the side frame that is located the both sides of liquid cooling board first direction, the side frame includes the frame body, is located last mouth shape frame and the lower mouth shape frame of frame body one side, be located go up mouth shape frame with a plurality of support pieces between the lower mouth shape frame, go up mouth shape frame with the lower mouth shape frame is all followed the length direction of side frame extends.

Further, the front end of the upper die frame exceeds the front end of the lower die frame forward, the side frames further comprise mounting frames fixed to the front ends of the side frames, and the upper die frames of the side frames and the mounting frames form a Chinese character 'ri' shaped port.

Further, the frame includes the preceding frame, the back frame that are located the both sides of liquid cooling board second direction, preceding frame be equipped with the inlet of feed liquor passageway intercommunication, with the liquid outlet of drain passageway intercommunication.

A battery pack comprises a battery pack shell, a plurality of battery modules and a control unit, wherein the battery modules are arranged on the battery pack shell.

The beneficial effects of the utility model are as follows: the utility model adopts the liquid cooling plate as the bottom plate of the battery pack shell, namely the liquid cooling plate and the bottom plate are combined into a whole, and the liquid cooling channel is positioned in the liquid cooling plate, so that the liquid cooling channel is separated from the battery module, and the damage of liquid leakage to the battery pack is prevented.

Drawings

Fig. 1 is a schematic view of a battery pack case according to the present utility model;

FIG. 2 is an exploded view of FIG. 1;

FIG. 3 is a diagram illustrating the liquid cooling plate and side frames of FIG. 1;

FIG. 4 is a schematic view of the side frame of FIG. 3;

FIG. 5 is a diagram showing the liquid cooling plate of FIG. 1 in combination with a front frame and a rear frame;

FIG. 6 is a cross-sectional view of FIG. 5 taken along the direction A-A and FIG. 1 is a schematic view showing the structure of a liquid cooling plate according to the present utility model;

FIG. 7 is a partial enlarged view at B in FIG. 6;

FIG. 8 is an exploded view of the liquid cooling plate of FIG. 1;

FIG. 9 is a schematic view of the lower plate of FIG. 8;

FIG. 10 is an enlarged view of a portion of FIG. 9 at C;

FIG. 11 is a partial enlarged view at D in FIG. 9;

fig. 12 is a partial enlarged view at E in fig. 9.

The device comprises a 100-battery pack shell, a 1-liquid cooling plate, an 11-upper layer plate, a 12-lower layer plate, a 13-liquid cooling channel, a 13' -liquid cooling groove, a 131-liquid inlet channel, a 132-liquid outlet channel, a 133-heat exchange channel, a 1331-liquid inlet branch, a 1332-liquid outlet branch, a 1333-flow dividing plate, a 1334-middle baffle plate, a 1335-guide structure, a 133 a-first heat exchange area channel, a 133a 1-first inflow branch, a 133a 2-first outflow branch, a 133 b-second heat exchange area channel, a 133b 1-second inflow branch, a 133b 2-second outflow branch, a 133b 3-transition branch, a 2-frame, a 21-side frame, a 211-frame body, a 213-upper-mouth frame, a 214-lower mouth frame, a 215-support piece, a 216-mounting frame, a 22-front frame, a 221-liquid inlet, a 222-liquid outlet, a 23-rear frame, a 20-fixing plate, a 3-positioning column, a 4-reinforcing bar and a 5-bracket.

Detailed Description

The present utility model will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the utility model and structural, methodological, or functional modifications of these embodiments that may be made by one of ordinary skill in the art are included within the scope of the utility model.

In the various drawings of the present utility model, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for convenience of illustration and thus serve only to illustrate the basic structure of the subject matter of the present utility model.

Referring to fig. 1 to 12, a battery pack case 100 according to the present utility model includes a liquid cooling plate 1 and a frame 2 connected to an outer periphery of the liquid cooling plate 1. The liquid cooling plate 1 is used as a bottom plate of the battery pack housing 100, that is, the liquid cooling plate 1 and the bottom plate are combined into one, the high integration is realized, the number of parts is reduced compared with that of similar products, and meanwhile, the liquid cooling channel 13 is separated from the battery module, so that the damage of leakage to the battery pack is prevented. The liquid cooling plate comprises an upper plate and a lower plate which are spliced with each other, and a liquid cooling groove is formed in the lower surface of the upper plate and/or the upper surface of the lower plate, so that a liquid cooling channel is formed between the upper plate and the lower plate.

The liquid cooling plate 1 comprises an upper plate 11 and a lower plate 12 which are spliced with each other, wherein a liquid cooling groove 13' is formed on the lower surface of the upper plate 11 and/or the upper surface of the lower plate 12, so that a liquid cooling channel 13 is formed between the upper plate 11 and the lower plate 12. The liquid cooling channel 13 is positioned between the upper layer plate 11 and the lower layer plate 12, so that the liquid cooling channel 13 is further prevented from being in direct contact with the battery module, and the use safety is improved; meanwhile, an additional liquid cooling pipeline and joint are omitted, and the failure risk of the liquid cooling pipeline and the liquid cooling joint is reduced.

In the preferred embodiment, the liquid cooling tank 13' is opened on the lower plate 12, the upper plate 11 is a flat plate with uniform thickness, and the structural strength is high, so that the compression resistance of the bottom plate is ensured. Or, the upper layer plate 11 and the lower layer plate 12 are respectively provided with a liquid cooling groove 13', preferably have the same shape, and are in mirror image splicing to form the liquid cooling plate 1 with the liquid cooling channels 13.

In this embodiment, the edges of the upper plate 11 and the lower plate 12 are connected by friction stir welding, so as to ensure the tightness of the connection and prevent liquid leakage. And, the edge of the liquid cooling board 1 of welding into an organic whole is lower than intermediate position, liquid cooling board 1 with when frame 2 is fixed, the edge is located the below of frame 2, even the edge welded part takes place the weeping phenomenon, the freezing liquid whereabouts also can not pollute the battery module down.

Further, the liquid cooling channel 13 includes a liquid inlet channel 131, a liquid outlet channel 132, and a plurality of heat exchanging channels 133 connected in parallel between the liquid inlet channel 131 and the liquid outlet channel 132. The heat exchange channels 133 are arranged in parallel, and even if some channels are blocked and damaged, other heat exchange channels 133 can still be used without affecting heat dissipation in other areas.

The liquid inlet channel 131 and the liquid outlet channel 132 are respectively located at two sides of the liquid cooling plate 1 in the first direction, and the plurality of heat exchange channels 133 are arranged along the second direction perpendicular to the first direction, so that temperatures of different areas in the first direction are relatively uniform. In this embodiment, the first direction is the width direction of the liquid cooling plate 1, and the second direction is the longitudinal direction/front-rear direction of the liquid cooling plate 1.

In one type of embodiment, as shown in fig. 9 to 11, the heat exchange channel 133 includes a liquid inlet branch 1331 that is communicated with the liquid inlet channel 131, and a liquid outlet branch 1332 that is communicated with the liquid inlet branch 1331 and the liquid outlet channel 132, where the liquid outlet branch 1332 is located at one side of the liquid inlet branch 1331 along the second direction, so that the liquid inlet branch 1331 and the liquid outlet branch 1332 are arranged in parallel in the second direction instead of being arranged in a partition manner, and the temperatures of different areas in the second direction are relatively uniform.

Preferably, the heat exchange channel 133 includes two liquid outlet branches 1332, and the two liquid outlet branches 1332 are respectively located at two sides of the liquid inlet branch 1331 along the second direction. After the cooling liquid enters from the liquid inlet branch 1331, the cooling liquid enters into the liquid outlet branches 1332 on two sides respectively in two ways, the flow path is shortened, the flow loss is small, and the temperature is uniform.

The liquid inlet branch 1331 extends along the first direction, the liquid outlet branch 1332 is U-shaped or serpentine, one end of the liquid inlet branch 1331, which is close to the liquid outlet channel 132, is communicated with one end of the liquid outlet branch 1332, and the other end of the liquid outlet branch 1332 is communicated with the liquid outlet channel 132, so that the flow path of the cooling liquid is properly prolonged, and full heat exchange is facilitated.

Further, as shown in fig. 9 and 11, at least one flow dividing plate 1333 extending along the first direction is disposed in the liquid inlet branch 1331 to divide the cooling liquid into a plurality of strands, so that the heat exchange area is enlarged and the heat exchange performance is improved. Or, a middle partition 1334 and at least one splitter plate 1333 positioned on one side or two sides of the middle partition 1334 in the second direction are arranged in the liquid inlet branch 1331, and the middle partition 1334 extends to one end, close to the liquid outlet channel 132, of the liquid inlet branch 1331. In order to improve the flow dividing effect, a guiding structure 1335 is provided at an end of the middle partition 1334 facing the liquid inlet channel 131, and the cooling liquid flows around the guiding structure 1335 and then enters the liquid inlet branches 1331 at two sides of the middle partition 1334.

Meanwhile, the middle partition plate 1334 and the splitter plate 1333 also play a supporting role between the upper layer plate 11 and the lower layer plate 12, so that the strength of the liquid cooling plate 1 is improved.

In another class of embodiments, as shown in fig. 9 and 12, the heat exchange channel 133 includes a first heat exchange area channel 133a and a second heat exchange area channel 133b arranged along a first direction, where the first heat exchange area channel 133a and the second heat exchange area channel 133b are communicated, and one of them is communicated with the liquid inlet channel 131, and the other is communicated with the liquid outlet channel 132. The first heat exchanging region channel 133a and the second heat exchanging region channel 133b correspond to two regions where different elements are mounted, for example, one for mounting a battery module and one for mounting a battery pack, respectively.

The first heat exchange area channel 133a includes a first inflow branch 133a1 extending spirally inward and a first outflow branch 133a2 communicating with the first inflow branch 133a1 and extending spirally outward, the first inflow branch 133a1 and the first outflow branch 133a2 are arranged in double spiral, and the first inflow branch 133a1 and the first outflow branch 133a2 are alternately arranged from outside to inside or from inside to outside, so that the cooling effect of the whole area is uniform.

The second heat exchange zone passage 133b includes a second inflow leg 133b1 extending in the second direction, a second outflow leg 133b2 extending in the second direction, and a transition leg 133b3 connecting the second inflow leg 133b1 and the second outflow leg 133b 2. Preferably, the second inflow branch 133b1 and the second outflow branch 133b2 are in a serpentine shape, and the transition branch 133b3 is in a U shape, so that the heat exchange area is increased and the heat dissipation effect is improved.

The liquid cooling plate 1 may employ any one of the heat exchanging channels 133 described above, or may employ a combination of the plurality of heat exchanging channels 133 described above as shown in fig. 9.

Referring to fig. 1 to 7, the frame 2 positions and protects the battery module from the periphery, and includes side frames 21 located at two sides of the liquid cooling plate 1 in the first direction, a front frame 22 and a rear frame 23 located at two sides of the liquid cooling plate 1 in the second direction.

The side frame 21 comprises a frame body 211, a fixing plate 20 positioned on one side of the frame body 211 to be fixed with the liquid cooling plate 1, an upper die frame 213 and a lower die frame 214 positioned on the other side of the frame body 211, and a plurality of supporting pieces 215 positioned between the upper die frame 213 and the lower die frame 214.

The fixing plate 20, the upper die frame 213 and the lower die frame 214 all extend along the length direction of the side frame 21, and support the upper die frame 213 and the lower die frame 214 through a plurality of supporting pieces 215, so that the cross-section design is optimized and the material and processing cost are reduced on the premise of meeting the structural strength and the function.

In addition, the front end of the upper die frame 213 is protruded forward beyond the front end of the lower die frame 214, that is, the front end of the upper die frame 213 is flush with the front end of the frame body 211, and the front end of the lower die frame 214 is located at the rear side of the front end of the upper die frame 213; the side frame 21 further comprises a mounting frame 216 fixed in front of the lower die frame 214, the upper die frame 213 and the mounting frame 216 form a Chinese character 'ri' shaped port at the front end of the side frame 21, an upper half space is used for a bolt fastening hole space between the battery pack shell 100 and an upper cover, and a lower half space is used for forklift transportation of the whole battery pack.

The front frame 22 is provided with a liquid inlet 221 communicated with the liquid inlet channel 131, and a liquid outlet 222 communicated with the liquid outlet channel 132, and a liquid inlet pipe and a liquid outlet pipe (not shown) respectively enter the battery pack housing 100 from the liquid inlet 221 and the liquid outlet 222 and are communicated with the liquid inlet channel 131 and the liquid outlet channel 132. Wherein the liquid inlet pipe passes through the upper layer plate 11 to be communicated with the liquid inlet channel, or the liquid inlet pipe is clamped between the upper layer plate 11 and the lower layer plate 12 to be welded together; the connection modes of the liquid outlet pipes are the same, and are not described in detail herein.

Further, the front frame 22 is further provided with a plurality of openings for installing components such as a high-pressure connector, a low-pressure connector, an explosion-proof valve, etc.

The front frame 22 and the rear frame 23 are also provided with fixing plates for fixing the liquid cooling plate 1, edges of the liquid cooling plate 1 are connected to the lower portion of the fixing plate 20, and the middle position of the liquid cooling plate 1 is flush with the fixing plate 20 for bearing the discharge cell module. Further, in order to improve stability, a plurality of reinforcing strips 4 are further disposed at the bottom of the liquid cooling plate 1, and two ends of the reinforcing strips 4 are respectively fixed on the two side frames 21.

Further, the battery pack housing 100 further includes a positioning post 3, which is located at the rear end of the side frame 21, for mounting and positioning the battery pack.

In addition, the liquid cooling plate 1, the side frames 21, the front frame 22 and the rear frame 23 are respectively formed by one-step extrusion of aluminum profiles, various mounting ports are formed by machining at necessary time, the design structure is simple, the section of the universal profiles is designed, and the development cost of dies and tools is reduced. The side frames 21, the front frame 22 and the rear frame 23 are spliced by the frames 2, the liquid cooling plate 1 is welded at the bottom of the frames 2 to form the battery pack shell 100, particularly, friction stir welding is adopted on the back, cold metal transition welding (cold metal transfer, CMT) is adopted on inner and outer vertical welding seams, the process is simple, the reliability is high, and the automation degree is high. Compared with the similar non-module battery Pack technology (CTP), the sealing device saves materials such as gluing, sealing gasket, screws (FDS) and the like, and has high sealing reliability of the box body.

The utility model also provides a battery pack, which comprises the battery pack shell 100, a plurality of battery modules positioned in the battery pack shell 100 and a control unit.

The upper surface of the liquid cooling plate 1 and the battery module are filled with heat conducting glue, and the filling thickness is about 1 mm; when the battery pack is produced, the heat conducting glue is coated on the upper surface of the liquid cooling plate 1 or the lower surface of the battery module, and the heat conducting glue is extruded in the installation process of the battery module, so that the heat conducting glue fully contacts the bottom of the battery contact module and the liquid cooling plate 1.

The liquid cooling plate 1 is provided with a bracket 5 for fixing the control unit, and the bracket 5 is welded on the liquid cooling plate 1 after being molded.

In this embodiment, a plurality of battery modules are arranged along the front-rear direction, and the battery modules near the front frame 22 are shorter than other battery modules, and the control unit and the battery modules are arranged side by side. Specifically, the battery module is located at the first heat exchange area channel 133a, and the control unit is located at the second heat exchange area channel 133 b.

In summary, the liquid cooling plate 1 is adopted as the bottom plate of the battery pack housing 100 in the utility model, that is, the liquid cooling plate 1 and the bottom plate are combined into one, and the liquid cooling channel 13 is located inside the liquid cooling plate 1, so that the liquid cooling channel 13 is separated from the battery module, and damage to the battery pack caused by leakage is prevented.

It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.

The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a battery package casing, its characterized in that includes the liquid cooling board, connect in the frame of liquid cooling board periphery, the liquid cooling board includes upper plate and the lower plate of mutual concatenation, the lower surface of upper plate and/or the shaping has the liquid cooling groove on the upper surface of lower plate, thereby constitute the liquid cooling passageway between upper plate and the lower plate.

2. The battery pack case according to claim 1, wherein: the liquid cooling channel comprises a liquid inlet channel, a liquid outlet channel and a plurality of heat exchange channels connected in parallel between the liquid inlet channel and the liquid outlet channel, wherein the liquid inlet channel and the liquid outlet channel are respectively positioned at two sides of the liquid cooling plate in the first direction, and the heat exchange channels are distributed along the second direction perpendicular to the first direction.

3. The battery pack case according to claim 2, wherein: the heat exchange channel comprises a liquid inlet branch communicated with the liquid inlet channel, and a liquid outlet branch communicated with the liquid inlet branch and the liquid outlet channel, and the liquid outlet branch is positioned at one side of the liquid inlet branch along the second direction.

4. A battery pack case according to claim 3, wherein: the heat exchange channel comprises two liquid outlet branches, and the two liquid outlet branches are respectively positioned at two sides of the liquid inlet branch along the second direction.

5. The battery pack case according to claim 3 or 4, wherein: the liquid inlet branch extends along a first direction, the liquid outlet branch is U-shaped or serpentine, one end of the liquid inlet branch, which is close to the liquid outlet channel, is communicated with one end of the liquid outlet branch, and the other end of the liquid outlet branch is communicated with the liquid outlet channel.

6. The battery pack case according to claim 3 or 4, wherein: at least one liquid inlet flow dividing plate extending along the first direction is arranged in the liquid inlet branch;

7. The battery pack case according to claim 2, wherein: the heat exchange channels comprise a first heat exchange area channel and a second heat exchange area channel which are distributed along a first direction, the first heat exchange area channel is communicated with the second heat exchange area channel, one of the first heat exchange area channel and the second heat exchange area channel is communicated with the liquid inlet channel, and the other heat exchange area channel is communicated with the liquid outlet channel.

8. The battery pack case according to claim 7, wherein: the first heat exchange area channel comprises a first inflow branch which extends spirally inwards and a first outflow branch which is communicated with the first inflow branch and extends spirally outwards, and the first inflow branch and the first outflow branch are arranged in a double-spiral mode.

9. The battery pack case according to claim 7, wherein: the second heat exchange zone channel comprises a second inflow branch extending along a second direction, a second outflow branch extending along the second direction, and a transition branch connecting the second inflow branch and the second outflow branch; wherein the second inflow branch and the second outflow branch are in a serpentine shape.

10. The battery pack case according to claim 2, wherein: the liquid inlet channels and the liquid outlet channels are respectively positioned at two sides of the width of the liquid cooling plate, and a plurality of heat exchange channels are distributed along the length direction of the liquid cooling plate.

11. The battery pack case according to claim 1, wherein: the frame is equipped with and is used for with the fixed plate mutually of liquid cooling board, the edge connection of liquid cooling board in the below of fixed plate, the intermediate position of liquid cooling board with the fixed plate flushes.

12. The battery pack case according to claim 1, wherein: the side frame comprises side frames positioned at two sides of the first direction of the liquid cooling plate, wherein the side frames comprise a frame body, an upper opening type frame and a lower opening type frame which are positioned at one side of the frame body, and a plurality of supporting pieces positioned between the upper opening type frame and the lower opening type frame, and the upper opening type frame and the lower opening type frame extend along the length direction of the side frames.

13. The battery pack case according to claim 12, wherein: the front end of the upper mouth frame exceeds the front end of the lower mouth frame forwards, the side frames further comprise mounting frames fixed to the front ends of the side frames, and the upper mouth frame of the side frames and the mounting frames form a Chinese character 'ri' -shaped port.

14. The battery pack case according to claim 2, wherein: the frame is including being located preceding frame, the back frame of the both sides of liquid cooling board second direction, preceding frame be equipped with the inlet of feed liquor passageway intercommunication, with the liquid outlet of liquid outlet passageway intercommunication.

15. A battery pack, characterized by comprising a battery pack case according to any one of claims 1 to 14, a plurality of battery modules and a control unit located on the battery pack case.