Battery pack cooling system and battery pack

Abstract

The utility model belongs to the technical field of battery packs, and discloses a battery pack cooling system and a battery pack, in the battery pack cooling system, a liquid cooling plate is provided with a cooling liquid flow channel for a cooling medium to flow, and the cooling medium in the cooling liquid flow channel can exchange heat with a battery module of the battery pack; a cooling medium can sequentially flow through the liquid inlet pipe assembly, the cooling liquid flow channel and the liquid outlet pipe assembly and exchanges heat with a battery module of the battery pack in the cooling liquid flow channel, so that the temperature of the battery module is reduced; in addition, the liquid inlet pipe assembly comprises a liquid inlet header pipe and a first communicating pipe, and the liquid inlet header pipe is used for allowing a cooling medium to enter; the first communicating pipe is connected with the liquid inlet header pipe and is used for dividing the cooling medium into two parts, one part of the cooling medium flows to one liquid cooling plate in the middle, and the other part of the cooling medium flows to the other liquid cooling plates, so that the actual cooling effect of the battery pack cooling system can be matched with the cooling requirement of the battery module.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery pack technical field especially relates to battery pack cooling system and battery pack. BACKGROUND

[0002] In order to promote the energy density of battery pack, the stacking number of battery module in battery pack is more and more, and its requirement to liquid cooling system is higher, and the liquid cooling pipe arrangement scheme adopted in the industry at present is that the inlet and outlet of liquid cooling plate are directly connected with the inlet and outlet of whole vehicle through liquid cooling pipe, and for the scheme of battery module stacking, multiple liquid cooling plates need to be set, and each liquid cooling plate is connected with the inlet and outlet of whole vehicle through separate liquid cooling pipe, leading to the overall structure of liquid cooling pipe being relatively complex.

[0003] For this, the prior art provides a kind of energy storage battery cluster, it is provided with inlet pipe and outlet pipe, inlet pipe and outlet pipe are connected with the liquid cooling plate of each layer battery module, so as to parallelly connect each liquid cooling plate, provide cooling liquid for multiple liquid cooling plates through inlet pipe at the same time, cooling liquid enters outlet pipe after flowing through the cooling liquid flow passage of liquid cooling plate, to simplify the overall structure of liquid cooling pipe. Wherein, inlet pipe and multiple liquid cooling plates are connected by multiple three-way pipes respectively, cooling liquid is divided into two parts when flowing through three-way pipe, one part flows into corresponding liquid cooling plate, and the other part continues to flow to other positions along inlet pipe. It can be understood that for stacked battery module, the battery module located in the middle part cannot be effectively cooled, so the temperature is higher, and the demand for cooling liquid is larger, and the temperature of battery module located at both ends is lower, but in this scheme, cooling liquid will enter inlet pipe from the lower part of energy storage battery cluster and flow upward in vertical direction, part of cooling liquid will be first divided into the liquid cooling plate located at the lowermost part, so the cooling liquid flow of the liquid cooling plate located at the lowermost part is the largest, and the cooling liquid flow of the liquid cooling plate located above is gradually smaller, thereby leading to the cooling efficiency of battery module located in the middle part being less than that of battery module located at the lowermost part, causing the actual cooling effect to be mismatched with the demand of each battery module. SUMMARY

[0004] According to one aspect of the present application, the battery pack cooling system is provided to solve the problem of mismatching between the actual cooling effect of the cooling system on each battery module and the demand of each battery module in the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A battery pack cooling system comprises a plurality of liquid cooling plates arranged in a first direction, the liquid cooling plates having cooling liquid flow channels for cooling medium to flow and the cooling medium in the cooling liquid flow channels being capable of exchanging heat with battery modules of a battery pack; the battery pack cooling system further comprises an inlet pipe assembly and an outlet pipe assembly, the cooling medium being capable of sequentially flowing through the inlet pipe assembly, the cooling liquid flow channels and the outlet pipe assembly; the inlet pipe assembly comprises:

[0007] an inlet main pipe for the cooling medium to enter;

[0008] a first communication pipe connected to the inlet main pipe and used for dividing the cooling medium into two parts, one part flowing to one of the liquid cooling plates in the middle and the other part flowing to the other liquid cooling plates.

[0009] As a preferred solution of the battery pack cooling system, the first communication pipe is a four-way pipe and has a first end, a second end, a third end and a fourth end, the first end is connected to the inlet main pipe, the second end is connected to one of the liquid cooling plates in the middle, the liquid cooling plate connected to the second end is a middle liquid cooling plate, the inlet pipe assembly further comprises two inlet branch pipes, one of the inlet branch pipes is connected to all the liquid cooling plates on one side of the middle liquid cooling plate in the first direction, the other inlet branch pipe is connected to all the liquid cooling plates on the other side of the middle liquid cooling plate in the first direction, the third end is connected to one of the inlet branch pipes, and the fourth end is connected to the other inlet branch pipe.

[0010] As a preferred solution of the battery pack cooling system, the second end and the middle liquid cooling plate are connected through a quick connector, the quick connector is fixedly arranged with the middle liquid cooling plate and detachably connected with the second end.

[0011] As a preferred solution of the battery pack cooling system, the liquid cooling plates at both ends are end liquid cooling plates, the inlet branch pipe comprises a plurality of inlet branch pipe segments connected in sequence, one of the inlet branch pipe segments at both ends is connected to the first communication pipe, the other inlet branch pipe segment is connected to the end liquid cooling plate, any two adjacent inlet branch pipe segments are connected through an inlet three-way valve, and the inlet three-way valve is further connected to the liquid cooling plates between the end liquid cooling plate and the middle liquid cooling plate.

[0012] As a preferred solution of the battery pack cooling system, the outlet pipe assembly comprises an outlet main pipe and a second communication pipe connected to the outlet main pipe, the second communication pipe is used for converging the two parts of the cooling medium, one part flowing to the second communication pipe from the middle liquid cooling plate and the other part flowing to the second communication pipe from the other liquid cooling plates.

[0013] As the preferred scheme of the battery pack cooling system, the second communication pipe is a four-way pipe and has a fifth end, a sixth end, a seventh end and an eighth end, the fifth end is connected with the liquid outlet main pipe, the sixth end is connected with the middle liquid cooling plate, the liquid outlet pipe assembly further comprises two liquid outlet branch pipes, one of the liquid outlet branch pipes is connected with all the liquid cooling plates on one side of the middle liquid cooling plate along the first direction, the other liquid outlet branch pipe is connected with all the liquid cooling plates on the other side of the middle liquid cooling plate along the first direction, the seventh end is connected with one of the liquid outlet branch pipes, and the eighth end is connected with the other liquid outlet branch pipe.

[0014] As the preferred scheme of the battery pack cooling system, the liquid cooling plates at both ends are end liquid cooling plates, the liquid outlet branch pipe comprises a plurality of sequentially connected liquid outlet branch pipe sections, one of the liquid outlet branch pipe sections is connected with the second communication pipe, and the other liquid outlet branch pipe section is connected with the end liquid cooling plate; any two adjacent liquid outlet branch pipe sections are connected through a liquid outlet three-way valve, and the liquid outlet three-way valve is further connected with the liquid cooling plate between the end liquid cooling plate and the middle liquid cooling plate.

[0015] As the preferred scheme of the battery pack cooling system, at least part of the cooling liquid flow channels of the liquid cooling plates are further provided with protrusions, and the protrusions extend along the flow direction of the cooling medium.

[0016] According to another aspect of the utility model, provide battery pack, including above -mentioned battery pack cooling system, further include battery module, the cooling medium in the cooling liquid flow channel can exchange heat with battery module.

[0017] As the preferred scheme of the battery pack, the battery module is provided with a plurality of, a plurality of battery module is sequentially arranged along the first direction, and the liquid cooling plate is arranged between any two adjacent battery modules.

[0018] The utility model discloses beneficial effect is:

[0019] The utility model provides battery pack cooling system, including a plurality of liquid cooling board who sets up along first direction interval, liquid cooling board has the cooling liquid flow channel for the cooling medium flow, and the cooling medium in cooling liquid flow channel can exchange heat with the battery module of battery pack, battery pack cooling system still includes liquid inlet pipe subassembly and liquid outlet pipe subassembly, and the cooling medium can flow through liquid inlet pipe subassembly, cooling liquid flow channel and liquid outlet pipe subassembly in proper order, and exchanges heat with the battery module of battery pack in cooling liquid flow channel, thereby reduce the temperature of battery module. Liquid inlet pipe subassembly includes liquid inlet main pipe and first communication pipe, and liquid inlet main pipe is used for the cooling medium to enter, first communication pipe connects liquid inlet main pipe, and is used for dividing the cooling medium into two parts, one part flows to one liquid cooling board in the middle, and the other part flows to other liquid cooling board, thereby making the cooling medium when being divided for the first time, a part of cooling medium directly enters one liquid cooling board in the middle, so that the cooling liquid flow of entering this liquid cooling board is larger, and the cooling efficiency is higher, because the temperature of battery module in the middle is generally higher, and the demand of corresponding liquid cooling board to cooling medium flow is also higher, therefore can make the actual cooling effect of battery pack cooling system and the cooling demand of battery module match.

[0020] The utility model further provides battery pack, including above -mentioned battery pack cooling system, still include battery module, and the cooling medium in cooling liquid flow channel can exchange heat with battery module. In this battery pack cooling system, the cooling medium can flow through liquid inlet pipe subassembly, cooling liquid flow channel and liquid outlet pipe subassembly in proper order, and exchanges heat with the battery module of battery pack in cooling liquid flow channel, thereby reduce the temperature of battery module. In addition, the cooling medium when being divided for the first time, a part of cooling medium directly enters one liquid cooling board in the middle, so that the cooling liquid flow of entering this liquid cooling board is larger, and the cooling efficiency is higher, can make the actual cooling effect of battery pack cooling system and the cooling demand of battery module match. ACCOUT OF DRAWINGS

[0021] Figure 1 It is the structure schematic diagram of battery pack cooling system in the utility model embodiment;

[0022] Figure 2 It is Figure 1 It is the enlarged view of A place in;

[0023] Figure 3 It is the schematic diagram of cooling liquid flow channel in liquid cooling board in the utility model embodiment;

[0024] Figure 4 It is the structure schematic diagram of quick plug connector and connecting pipe in the utility model embodiment;

[0025] Figure 5 It is the sectional view of quick plug connector and connecting pipe in the utility model embodiment.

[0026] Fig.:

[0027] 1, liquid cooling plate; 11, cooling liquid flow channel; 12, protrusion; 13, liquid inlet; 14, liquid outlet;

[0028] 2, liquid inlet pipe assembly; 21, liquid inlet main pipe; 22, first communication pipe; 23, liquid inlet branch pipe; 231, liquid inlet branch pipe section; 232, liquid inlet tee joint valve;

[0029] 3, liquid outlet pipe assembly; 31, liquid outlet main pipe; 32, second communication pipe; 33, liquid outlet branch pipe; 331, liquid outlet branch pipe section; 332, liquid outlet tee joint valve;

[0030] 4, quick connector; 41, clamping groove; 42, sealing ring;

[0031] 5, connecting pipe; 51, clamping protrusion. DETAILED DESCRIPTION

[0032] The utility model will be described in further detail below in combination with the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the utility model, and not to limit the utility model. In addition, it should be noted that, in order to facilitate the description, only the part related to the utility model is shown in the drawings, not all structures.

[0033] In the description of the utility model, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0034] In the utility model, unless otherwise explicitly specified and limited, the first feature "on" or "below" the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are only used to distinguish in the description, and have no special meaning.

[0036] The prior art provides an energy storage battery cluster which simultaneously supplies cooling liquid to multiple liquid cooling plates through an inlet pipe, and the cooling liquid enters an outlet pipe after flowing through the cooling liquid flow channel of the liquid cooling plate, thereby simplifying the overall structure of the liquid cooling pipe. However, in this scheme, the cooling liquid will enter the inlet pipe from the bottom of the energy storage battery cluster and flow upward in the vertical direction, and part of the cooling liquid will be first diverted to the liquid cooling plate located at the lowest position, so that the cooling liquid flow of the liquid cooling plate located at the lowest position is the largest, and the cooling liquid flow of the liquid cooling plate located above is gradually smaller, thereby causing the cooling efficiency of the battery module located at the middle position to be less than that of the battery module located at the lowest position, resulting in a mismatch between the actual cooling effect and the demand of each battery module.

[0037] To this end, the present embodiment provides a battery pack cooling system to solve the problem that the actual cooling effect of the cooling system on each battery module does not match the demand of each battery module, which can be used in the field of battery pack technology.

[0038] Reference Figures 1-5The battery pack cooling system comprises a plurality of liquid cooling plates 1 arranged in a first direction, in the embodiment, the first direction is the vertical direction, the battery modules are stacked in the vertical direction, and the plurality of liquid cooling plates 1 are arranged in the vertical direction in sequence. The liquid cooling plate 1 has a cooling liquid flow channel 11 for the flow of cooling medium, and the cooling medium in the cooling liquid flow channel 11 can exchange heat with the battery modules of the battery pack, wherein the cooling medium is generally liquid cooling medium. The battery pack cooling system further comprises an inlet pipe assembly 2 and an outlet pipe assembly 3, and the cooling medium can flow through the inlet pipe assembly 2, the cooling liquid flow channel 11 and the outlet pipe assembly 3 in sequence, and exchange heat with the battery modules of the battery pack in the cooling liquid flow channel 11, thereby reducing the temperature of the battery modules. The inlet pipe assembly 2 comprises an inlet main pipe 21 for the cooling medium to enter, and a first communication pipe 22 connected to the inlet main pipe 21 and used to divide the cooling medium into two parts, one part flows to one of the liquid cooling plates 1 in the middle, and the other part flows to the other liquid cooling plates 1, so that when the cooling medium is first divided, a part of the cooling medium directly enters one of the liquid cooling plates 1 in the middle, so that the flow of the cooling liquid entering the liquid cooling plate 1 is larger, and the cooling efficiency is higher. Since the temperature of the battery module in the middle is generally higher, the corresponding liquid cooling plate 1 has a higher demand for cooling medium flow, so the actual cooling effect of the battery pack cooling system can be matched with the cooling demand of the battery module.

[0039] With reference to the above Figures 1-5 The first communication pipe 22 is a four-way pipe and has a first end, a second end, a third end and a fourth end, the first end is connected to the inlet main pipe 21, the second end is connected to one of the liquid cooling plates 1 in the middle, and the liquid cooling plate 1 connected to the second end is the middle liquid cooling plate, the inlet pipe assembly 2 further comprises two inlet branch pipes 23, one of the inlet branch pipes 23 is connected to all the liquid cooling plates 1 on one side of the middle liquid cooling plate along the first direction, and the other inlet branch pipe 23 is connected to all the liquid cooling plates 1 on the other side of the middle liquid cooling plate along the first direction, the third end is connected to one of the inlet branch pipes 23, and the fourth end is connected to the other inlet branch pipe 23, so that the inlet main pipe 21 is connected to the inlet branch pipes 23 on both sides through the four-way pipe, thereby the cooling medium can be delivered to the other liquid cooling plates 1.

[0040] In this embodiment, the liquid cooling plate 1 is provided with 5, the middle liquid cooling plate is the liquid cooling plate 1 located in the middle, that is, the third liquid cooling plate 1 along the first direction. In other embodiments, the liquid cooling plate 1 can also be provided with 3, the middle liquid cooling plate is the second liquid cooling plate 1 along the first direction; or, the liquid cooling plate 1 is provided with 7, the middle liquid cooling plate is the fourth liquid cooling plate 1 along the first direction. In addition, the number of liquid cooling plates 1 can also be an even number, for example, the liquid cooling plate 1 is provided with 4, the middle liquid cooling plate is the second or third liquid cooling plate 1 along the first direction; for example, the liquid cooling plate 1 is provided with 6, the middle liquid cooling plate is the third or fourth liquid cooling plate 1 along the first direction.

[0041] With reference to the foregoing Figures 1-5 , the second end and the middle liquid cooling plate are connected through the quick connector 4, the quick connector 4 is fixedly provided with the middle liquid cooling plate and is detachably connected with the second end, so as to quickly connect the four-way pipe with the middle liquid cooling plate and facilitate the disassembly therebetween. Specifically, the inner cavity of the quick connector 4 for connecting with the second end is in communication with the liquid inlet 13 of the liquid cooling plate 1, and the cooling medium can flow to the cooling liquid flow channel 11 through the liquid inlet 13. In addition, the second end is specifically connected with the connecting pipe 5, the quick connector 4 can be inserted into the connecting pipe 5 and abut against the inner wall of the connecting pipe 5, and optionally, the quick connector 4 is also provided with a clamping groove 41, the connecting pipe 5 is provided with a clamping protrusion 51, the clamping protrusion 51 is clamped with the clamping groove 41, so as to connect the two, and in other embodiments, the clamping groove 41 can also be provided in the connecting pipe 5, and the clamping protrusion 51 is provided in the quick connector 4, and the two can also be clamped and matched to connect the quick connector 4 with the connecting pipe 5. In addition, in order to ensure the sealing performance between the two, the sealing ring 42 is further arranged between the quick connector 4 and the inner wall of the connecting pipe 5 to achieve the sealing effect and prevent the cooling medium from leaking.

[0042] With reference to the foregoing Figures 1-5 , the liquid cooling plate 1 located at both ends is the end liquid cooling plate, the liquid inlet branch pipe 23 includes a plurality of sequentially connected liquid inlet branch pipe sections 231, among the liquid inlet branch pipe sections 231 located at both ends, one liquid inlet branch pipe section 231 is connected with the first communication pipe 22, and the other liquid inlet branch pipe section 231 is connected with the end liquid cooling plate, any two adjacent liquid inlet branch pipe sections 231 are connected through the liquid inlet three-way valve 232, and the liquid inlet three-way valve 232 is also connected with the liquid cooling plate 1 located between the end liquid cooling plate and the middle liquid cooling plate. Among them, the number of liquid cooling plates 1 located between the end liquid cooling plate and the middle liquid cooling plate is the same as the number of liquid inlet three-way valves 232, and they are connected one by one. In addition, the liquid cooling plate 1 located between the end liquid cooling plate and the middle liquid cooling plate can also be connected with the liquid inlet three-way valve 232 through the quick connector 4.

[0043] With reference to the foregoing Figures 1-5The liquid outlet pipe assembly 3 comprises a liquid outlet main pipe 31 and a second communication pipe 32 connected with the liquid outlet main pipe 31, the second communication pipe 32 is used to converge two parts of the cooling medium, one part flows to the second communication pipe 32 from the middle liquid cooling plate, and the other part flows to the second communication pipe 32 from the other liquid cooling plate 1, so that the cooling medium can directly flow to the second communication pipe 32 after flowing through the middle liquid cooling plate, and then flow into the liquid outlet main pipe 31 and finally be discharged, so that the middle liquid cooling plate has a single and complete cooling medium flow channel, thereby further improving the cooling effect.

[0044] Specifically, the second communication pipe 32 is a four-way pipe and has a fifth end, a sixth end, a seventh end and an eighth end, the fifth end is connected with the liquid outlet main pipe 31, the sixth end is connected with the middle liquid cooling plate, the liquid outlet pipe assembly 3 further comprises two liquid outlet branch pipes 33, one of which is connected with all the liquid cooling plates 1 located on one side of the middle liquid cooling plate along the first direction, and the other is connected with all the liquid cooling plates 1 located on the other side of the middle liquid cooling plate along the first direction, the seventh end is connected with one of the liquid outlet branch pipes 33, and the eighth end is connected with the other liquid outlet branch pipe 33, so that the two liquid outlet branch pipes 33 on both sides are connected with the liquid outlet main pipe 31 through the four-way pipe, thereby guiding the cooling medium of the other liquid cooling plate 1 to flow to the liquid outlet main pipe 31. The sixth end and the middle liquid cooling plate are also connected through the quick plug connector 4, specifically, the inner cavity of the quick plug connector 4 connected with the sixth end is in communication with the liquid outlet port 14 of the liquid cooling plate 1, and the cooling medium in the cooling liquid flow channel 11 can flow into the inner cavity of the quick plug connector 4 through the liquid outlet port 14.

[0045] Continuing to refer to Figures 1-5 The liquid outlet branch pipe 33 comprises a plurality of sequentially connected liquid outlet branch pipe segments 331, one of the liquid outlet branch pipe segments 331 at both ends is connected with the second communication pipe 32, and the other liquid outlet branch pipe segment 331 is connected with one of the end liquid cooling plates, any two adjacent liquid outlet branch pipe segments 331 are connected through a liquid outlet three-way valve 332, and the liquid outlet three-way valve 332 is also connected with the liquid cooling plate 1 located between the end liquid cooling plate and the middle liquid cooling plate. Among them, the number of the liquid cooling plate 1 located between the end liquid cooling plate and the middle liquid cooling plate is the same as the number of the liquid outlet three-way valve 332, and they are connected one by one. In addition, the liquid cooling plate 1 located between the end liquid cooling plate and the middle liquid cooling plate is also connected with the liquid outlet three-way valve 332 through the quick plug connector 4.

[0046] Continuing to refer to Figures 1-5 The cooling liquid flow channel 11 of at least part of the liquid cooling plate 1 is also provided with a protrusion 12 extending along the flow direction of the cooling medium, on the one hand, the protrusion 12 can separate the cooling liquid flow channel 11, making the flow of the cooling medium more smooth, on the other hand, the protrusion 12 itself can also exchange heat with the cooling medium, and the protrusion 12 can conduct heat with the liquid cooling plate 1, thereby improving the heat exchange efficiency.

[0047] The battery pack cooling system of the embodiment further provides a battery pack, which comprises the battery pack cooling system and a battery module, and the cooling medium in the cooling liquid flow channel 11 can exchange heat with the battery module.

[0048] Continuing to refer to Figures 1-5 The battery module is provided in plurality, and the plurality of battery modules are sequentially arranged along the first direction, and the liquid cooling plate 1 is arranged between any two adjacent battery modules, so that the battery modules and the liquid cooling plates 1 are alternately arranged.

[0049] Obviously, the above embodiments of the utility model are only examples for clearly explaining the utility model, and are not the limitation of the embodiments of the utility model. For the ordinary skilled in the art, various obvious changes, re-adjustments and replacements can be made without departing from the protection scope of the utility model. Here, it is not necessary and impossible to exhaust all the embodiments. Any modification, equivalent replacement and improvement within the spirit and principle of the utility model should be included in the protection scope of the utility model claim.

Claims

1. A battery pack cooling system, characterized by, The battery pack cooling system comprises a plurality of liquid cooling plates (1) arranged at intervals along a first direction, the liquid cooling plates (1) are provided with cooling liquid flow channels (11) for cooling medium flow, and the cooling medium in the cooling liquid flow channels (11) can exchange heat with the battery modules of the battery pack; the battery pack cooling system further comprises an inlet pipe assembly (2) and an outlet pipe assembly (3), and the cooling medium can flow through the inlet pipe assembly (2), the cooling liquid flow channels (11) and the outlet pipe assembly (3) in sequence; the inlet pipe assembly (2) comprises: an inlet main pipe (21) for the cooling medium to enter; a first communication pipe (22) connected to the inlet main pipe (21) and used for dividing the cooling medium into two parts, one part flows to one of the liquid cooling plates (1) located in the middle, and the other part flows to the other liquid cooling plates (1).

2. The battery pack cooling system of claim 1, wherein, The first communication pipe (22) is a four-way pipe and has a first end, a second end, a third end and a fourth end, the first end is connected to the inlet main pipe (21), the second end is connected to one of the liquid cooling plates (1) located in the middle, the liquid cooling plate (1) connected to the second end is a middle liquid cooling plate, the inlet pipe assembly (2) further comprises two inlet branch pipes (23), one of the inlet branch pipes (23) is connected to all the liquid cooling plates (1) located on one side of the middle liquid cooling plate along the first direction, the other inlet branch pipe (23) is connected to all the liquid cooling plates (1) located on the other side of the middle liquid cooling plate along the first direction, the third end is connected to one of the inlet branch pipes (23), and the fourth end is connected to the other inlet branch pipe (23).

3. The battery pack cooling system of claim 2, wherein, The second end and the middle liquid cooling plate are connected through a quick plug connector (4), the quick plug connector (4) is fixedly arranged with the middle liquid cooling plate and detachably connected with the second end.

4. The battery pack cooling system of claim 2, wherein, The liquid cooling plates (1) located at both ends are end liquid cooling plates, the inlet branch pipe (23) comprises a plurality of inlet branch pipe segments (231) connected in sequence, one of the inlet branch pipe segments (231) at both ends is connected to the first communication pipe (22), the other inlet branch pipe segment (231) is connected to the end liquid cooling plate, any two adjacent inlet branch pipe segments (231) are connected through an inlet three-way valve (232), and the inlet three-way valve (232) is further connected to the liquid cooling plates (1) located between the end liquid cooling plate and the middle liquid cooling plate.

5. The battery pack cooling system of any one of claims 2-4, wherein, The outlet pipe assembly (3) comprises an outlet main pipe (31) and a second communication pipe (32) connected to the outlet main pipe (31), and the second communication pipe (32) is used for converging the two parts of the cooling medium, one part flows to the second communication pipe (32) from the middle liquid cooling plate, and the other part flows to the second communication pipe (32) from the other liquid cooling plates (1).

6. The battery pack cooling system of claim 5, wherein, The second communication pipe (32) is a four-way pipe and has a fifth end, a sixth end, a seventh end and an eighth end, the fifth end is connected with the liquid outlet main pipe (31), the sixth end is connected with the middle liquid cooling plate, the liquid outlet pipe assembly (3) further comprises two liquid outlet branch pipes (33), one of the liquid outlet branch pipes (33) is connected with all the liquid cooling plates (1) located on one side of the middle liquid cooling plate along the first direction, the other liquid outlet branch pipe (33) is connected with all the liquid cooling plates (1) located on the other side of the middle liquid cooling plate along the first direction, the seventh end is connected with one of the liquid outlet branch pipes (33), and the eighth end is connected with the other liquid outlet branch pipe (33).

7. The battery pack cooling system of claim 6, wherein, The liquid cooling plates (1) located at both ends are end liquid cooling plates, the liquid outlet branch pipe (33) comprises a plurality of liquid outlet branch pipe sections (331) connected in sequence, among the liquid outlet branch pipe sections (331) located at both ends, one of the liquid outlet branch pipe sections (331) is connected with the second communication pipe (32), the other liquid outlet branch pipe section (331) is connected with the end liquid cooling plate, and any two adjacent liquid outlet branch pipe sections (331) are connected through a liquid outlet three-way valve (332), and the liquid outlet three-way valve (332) is further connected with the liquid cooling plate (1) located between the end liquid cooling plate and the middle liquid cooling plate.

8. The battery pack cooling system of any one of claims 1-4, wherein, The cooling liquid flow channel (11) of at least part of the liquid cooling plate (1) is further provided with a protrusion (12), and the protrusion (12) extends along the flow direction of the cooling medium.

9. A battery pack, characterized by The battery pack cooling system comprises the battery module, and the cooling medium in the cooling liquid flow channel (11) can exchange heat with the battery module.

10. The battery pack of claim 9, wherein, The battery module is provided in plurality, and the plurality of battery modules are sequentially arranged along the first direction, and the liquid cooling plate (1) is arranged between any two adjacent battery modules.

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