Liquid cooling assembly for battery, battery module unit and battery

Abstract

The utility model belongs to the technical field of power batteries, and provides a liquid cooling assembly for a battery, a battery module unit and a battery, the liquid cooling assembly comprises a liquid cooling fin, the outer side wall of the liquid cooling fin is used for fixing a battery cell, a liquid cooling flow channel is arranged in the liquid cooling fin, and the liquid cooling flow channel comprises deformable sections which are arranged at intervals along the direction perpendicular to the extension direction of the liquid cooling flow channel, and the deformable section is provided with a continuous fluctuating structure along the extending direction of the liquid cooling flow channel to form an elastic deformation space capable of absorbing the transverse expansion of the battery cell. Compared with the prior art, the liquid cooling fins are internally provided with the liquid cooling flow channels in contact with the main surfaces of the battery cells, and the deformable sections are arranged at intervals in the direction perpendicular to the extension direction of the liquid cooling flow channels, so that the heat exchange efficiency between the liquid cooling fins and the battery cells is improved, and the heat exchange efficiency of the battery cells is improved on the premise of not additionally adding buffer materials. And transverse extrusion force generated by expansion of the battery cell is absorbed. The method improves the utilization rate of the internal space of the battery and reduces the manufacturing cost of the battery.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of power battery, concretely relates to a liquid cooling assembly for battery, battery module unit and battery. BACKGROUND

[0002] With the further intensification of global electric vehicle market competition, as the most critical component of electric vehicles, the design optimization of power batteries has become the most popular topic in the industry. Energy density and safety are important indicators of power batteries, and are crucial to improving their market competitiveness. Therefore, continuously improving the volume utilization rate of battery packs, efficiently integrating key components, and the like have become problems that need to be solved in the power battery industry.

[0003] The utility model patent with the publication number CN221552029U discloses a soft package large module and battery pack design scheme. The battery pack design scheme adopts the form of large cell vertical placement to form a large module, end plates for fixing the cells are arranged at the left and right ends of the large module, and bus bar supports are arranged at the front and rear ends. The bus bar supports are provided with bus bars and sampling FPCs (flexible circuit boards), the tabs pass through the bus bar supports and are connected with the bus bars, and the sampling terminals of the sampling FPCs are welded and fixed with the corresponding tabs. The left and right sides of the sampling FPCs are respectively connected with the two end plates one by one. The liquid cooling plate is placed on the upper and lower end faces of the large module.

[0004] Although the above scheme is an effective module design scheme, the flat liquid cooling plate can only cool the side surface of the cell, and the thermal management effect is limited. Due to the low efficiency of this liquid cooling form, the entire battery pack will be affected in terms of fast charging and thermal safety performance. A large amount of buffer material is also needed to absorb the cell expansion, which not only occupies the space in the battery, reduces the grouping efficiency, but also increases the overall cost. UTILITY MODEL CONTENTS

[0005] The utility model discloses the technical problem to be solved is in view of the present situation of prior art, and provide a liquid cooling assembly for battery, battery module unit and battery.

[0006] The utility model discloses the technical scheme that the above technical problem is solved adopts: propose a liquid cooling assembly for battery, comprising:

[0007] The liquid cooling fin is used for fixing the cell, the inside of the liquid cooling fin is equipped with liquid cooling flow channel, the liquid cooling flow channel includes deformable section, the deformable section is arranged along the direction of the liquid cooling flow channel extension and is spaced, the deformable section forms the heat exchange passage for fluid, and the deformable section has continuous undulating structure;

[0008] The deformable section with a continuous undulating structure is used to absorb the transverse extrusion force generated by the swelling of the battery cell.

[0009] In the liquid cooling assembly for the battery, the liquid cooling flow channel comprises a limiting section, the limiting section is provided with limiting protrusions arranged at intervals, the limiting protrusions extend along the inner wall of the liquid cooling flow channel, and the interval distance between the end of the limiting protrusions and the inner wall of the liquid cooling flow channel is positively correlated with the elastic deformation amount of the deformable section, so as to constrain the transverse contraction amplitude of the liquid cooling flow channel.

[0010] In the liquid cooling assembly for the battery, the continuous undulating structure of the deformable section is one of a wave shape, a sawtooth shape or a sine wave shape.

[0011] The cross section of the limiting protrusion is a trapezoidal shape.

[0012] In the liquid cooling assembly for the battery, the liquid cooling fin comprises a liquid cooling plate body and a liquid cooling fin wing, the liquid cooling fin wing is arranged at one end or both ends of the liquid cooling plate body in a direction perpendicular to the liquid cooling flow channel, so that the cross section of the liquid cooling fin is in a T-shaped structure or an I-shaped structure.

[0013] In the liquid cooling assembly for the battery, two or more battery cells are arranged on both sides of the liquid cooling fin, and the main surfaces of the battery cells are fixed to the surface of the liquid cooling fin through a heat-conducting structural adhesive.

[0014] The liquid cooling assembly for the battery further comprises an FPC support, and the FPC support is provided with an FPC adapter copper bar.

[0015] The battery cells on the liquid cooling fin are arranged in a vertical series connection, each battery cell comprises a tab, the tabs between two adjacent battery cells on the same side of the liquid cooling fin are overlapped, and the tabs are extended to the end of the liquid cooling fin in the height direction through the FPC adapter copper bar.

[0016] The liquid cooling assembly for the battery further comprises a tab welding support, the tab welding support is provided with a tab copper bar, and the tabs between the battery cells on both sides of the end of the liquid cooling fin are electrically connected through the tab copper bar.

[0017] The liquid cooling assembly for the battery further comprises a positioning structure for fixing the FPC support on the liquid cooling fin, the liquid cooling fin comprises a first liquid cooling fin wing and a second liquid cooling fin wing arranged oppositely, and the positioning structure comprises:

[0018] A positioning hole is arranged on the first liquid cooling fin wing, and the FPC support is provided with a positioning column matched with the positioning hole.

[0019] A buckle is arranged on the second liquid cooling fin sheet, a clamping groove is arranged on the FPC support, and the buckle and the clamping groove form a clamping structure.

[0020] The utility model discloses solve above-mentioned technical problem still propose a kind of battery module unit, comprising:

[0021] The utility model discloses solve above-mentioned technical problem still propose a kind of liquid cooling assembly for battery;

[0022] Liquid cooling plug, the liquid cooling fin is provided with the liquid cooling plug at both ends along the extension direction of the liquid cooling flow channel, and the liquid cooling plug is used to constitute the fluid inlet and outlet of the liquid cooling flow channel.

[0023] The utility model discloses solve above-mentioned technical problem still propose a kind of battery, comprising:

[0024] A plurality of the battery module units are electrically connected by series copper bars between the plurality of battery module units, and heat insulation material is arranged between the connected battery module units.

[0025] Liquid cooling straight pipe, the liquid cooling plugs of the battery module units on the same side are communicated by the liquid cooling straight pipe.

[0026] Liquid cooling pipe, each liquid cooling straight pipe is connected with one liquid cooling pipe, to form a circulating cooling system.

[0027] Compared with prior art, the utility model has following beneficial effects:

[0028] (1) by arranging liquid cooling flow channel in the inside of liquid cooling fin, and deformable section is arranged at interval along the extension direction perpendicular to liquid cooling flow channel, can absorb transverse extrusion force generated by the expansion of electric core under the premise of not additionally increasing buffer material when increasing the heat exchange efficiency between liquid cooling fin and electric core, and, after the recovery of electric core, the elastic deformation is recovered simultaneously, the utilization rate of the space inside battery is improved, and the manufacturing cost of battery is reduced.

[0029] (2) by arranging limiting protrusion in liquid cooling flow channel, the deformation of liquid cooling fin is limited, to prevent the deformation amount of liquid cooling fin from exceeding its elastic deformation limit.

[0030] (3) by arranging FPC support containing FPC adapter copper bar and tab support containing tab copper bar, the series connection between the plurality of electric cores arranged on liquid cooling fin is realized. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is the perspective view of the battery module unit of the utility model;

[0032] Figure 2 It is the perspective view of liquid cooling fin;

[0033] Figure 3 is a sectional view of a liquid cooling fin;

[0034] Figure 4 is Figure 1 is an exploded view of the battery after omitting the battery cell;

[0035] Figure 5 is Figure 1 is an exploded view of the battery;

[0036] Figure 6 is a partial structure schematic view of the battery;

[0037] Figure 7 is a perspective view of the battery after omitting the upper cover;

[0038] Figure 8 is an exploded view of the battery.

[0039] In the figure, 100, shell structure;110, upper cover;120, lower box body;130, front beam;140, rear beam;200, circulating cooling system;210, heat insulation material;220, liquid cooling straight pipe;230, liquid cooling pipe;300, battery module unit;310, battery cell;311, main surface;312, edge;313, tab;320, liquid cooling assembly;321, liquid cooling fin;321a, liquid cooling plate main body;321b, liquid cooling fin wing piece;322, liquid cooling flow channel;322a, deformable section;322b, limiting protrusion;330, FPC support;331, FPC adapter copper bar;332, clamping groove;340, tab welding support;341, tab copper bar;350, positioning structure;351, positioning hole;352, buckle;360, liquid cooling plug;361, water nozzle;400, power transmission and signal acquisition system;410, first flexible printed circuit board;420, second flexible printed circuit board;430, third flexible printed circuit board;440, copper bar cover plate. DETAILED DESCRIPTION

[0040] The following are specific embodiments of the present application and further describe the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0041] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0042] As Figures 1 to 8 shown, the liquid cooling assembly for the battery comprises a liquid cooling fin 321.

[0043] The liquid-cooled fin 321 is preferably an integrally extruded aluminum profile, with its outer wall along the thickness direction used to fix the battery cell 310. The integrally extruded aluminum profile not only improves structural strength but also facilitates the mass production of the liquid-cooled fin 321. Liquid-cooled channels 322 are provided inside the liquid-cooled fin 321 that contact the main surface 311 (i.e., the large surface) of the battery cell 310. These channels 322 are used to increase the heat exchange efficiency between the liquid-cooled fin 321 and the battery cell 310.

[0044] In this design, the structure of the liquid cooling channel 322 is configured to absorb the lateral compressive force generated by the expansion of the battery cell 310 while exchanging heat with the battery cell 310 fixed on the liquid cooling fins 321.

[0045] Specifically, the liquid cooling channel 322 includes deformable sections 322a, which extend along a direction perpendicular to the liquid cooling channel 322 (i.e., Figure 3 The deformable sections 322a are arranged at intervals in the vertical direction to form heat exchange channels for fluid passage. Figure 3 It has a continuous undulating structure in the left and right directions. This structure is used in the liquid-cooled fins 321 under the influence of the longitudinal direction. Figure 3 When subjected to compressive force in the left and right directions, elastic deformation occurs, thereby forming an elastic deformation space that absorbs the lateral expansion of the battery cell 310.

[0046] Furthermore, since the liquid-cooled fins 321 are integrally extruded aluminum profiles, the deformable section can still recover synchronously with the battery cell 310 after the battery cell 310 recovers. In this way, by ensuring that the battery cell 310 is always in close contact with the liquid-cooled fins 321, effective heat exchange with the battery cell 310 can be maintained continuously, and its deformation can be absorbed.

[0047] Both ends of the liquid-cooled fins 321 are used to fix the battery cell 310. (Refer to...) Figure 3 During operation, the fluid in the liquid cooling channel 322 exchanges heat with the battery cell 310. Since the liquid cooling fins 321 in this design have a liquid cooling channel 322 inside that contacts the main surface 311 of the battery cell 310, the main surface 311 of the battery cell 310 can achieve better heat exchange effect by introducing liquid cooling fluid into the liquid cooling channel 322.

[0048] Furthermore, when cell 310 expands, refer to Figure 3 The battery cell 310 will apply an edge-to-edge cooling force to the liquid-cooled fins 321. Figure 3 Thrust in the left and right directions. Due to the presence of the deformable section 322a, the liquid-cooled fins 321 will... Figure 3The deformation in the left and right directions provides space for the expansion of the cell 310. In this way, the internal space of the liquid-cooled fins 321 itself reserves space for the expansion of the cell 310, eliminating the need for additional cushioning materials, greatly reducing the space occupied within the battery pack, improving assembly efficiency, and reducing overall cost.

[0049] To further improve the performance of the liquid-cooled fins 321, this solution also includes a limiting section. The limiting section is provided with spaced limiting protrusions 322b. The limiting protrusions 322b extend along the inner wall of the liquid-cooled flow channel 322. The distance between their ends and the inner wall of the liquid-cooled flow channel 322 is positively correlated with the elastic deformation of the deformable section 322a, which is used to constrain the lateral contraction amplitude of the liquid-cooled flow channel 322.

[0050] Reference Figure 3 The purpose of the limiting protrusion 322b is to provide a limit for the deformation of the liquid cooling fins 321. The liquid cooling channel 322 has a flow path along... Figure 3 The first inner wall and the second inner wall are arranged in the left and right directions. Both the first inner wall and the second inner wall are provided with limiting protrusions 322b. When the deformable section 322a undergoes elastic deformation to the limit state, it abuts against the limiting protrusions 322b to prevent the deformation of the liquid-cooled fin 321 from exceeding its elastic deformation limit, thereby avoiding irreversible damage to the structure of the liquid-cooled fin 321.

[0051] Preferably, the limiting protrusions 322b are arranged in a staggered manner on the inner wall of the liquid cooling channel 322. Specifically, refer to... Figure 3 Following a top-to-bottom arrangement, a limiting protrusion 322b is placed on the right side wall of the liquid cooling channel 322, followed by a limiting protrusion 322b on the left side wall, and then another limiting protrusion 322b on the right side wall, and so on. This staggered arrangement can effectively disperse stress and avoid structural failure caused by local overload.

[0052] To enable the deformable section 322a to elastically deform under compressive pressure on the liquid-cooled fin 321, the continuous undulating structure of the deformable section 322a is one of a wave shape, a sawtooth shape, or a sinusoidal waveform. To make the structure of the limiting section more robust, so that the limiting protrusion 322b can effectively limit the deformation of the liquid-cooled fin 321, the cross-section of the limiting protrusion 322b is trapezoidal. Preferably, the wall thickness of both the limiting protrusion 322b and the deformable section 322a is 0.5 ± 0.05 mm. This design ensures both sufficient mechanical strength and good thermal conductivity.

[0053] The liquid cooling fin 321 comprises a liquid cooling plate body 321a and a liquid cooling fin wing 321b, the liquid cooling flow channel 322 is arranged in the liquid cooling plate body 321a, the main surface 311 of the battery cell 310 is fixed with the liquid cooling plate body 321a, and the sealing edge 312 of the battery cell 310 is in close contact with the liquid cooling fin wing 321b.

[0054] The liquid cooling fin wing 321b is preferably a solid structure, most of the heat generated by the battery cell 310 is exchanged with the liquid cooling fin 321 in the manner of being conducted to the liquid cooling plate body 321a through the main surface 311 of the battery cell 310, and the rest of the heat is exchanged with the liquid cooling fin 321 in the manner of being conducted to the liquid cooling fin wing 321b through the two sealing edges 312 of the battery cell 310.

[0055] In one embodiment, the liquid cooling fin 321 is provided with a liquid cooling fin wing 321b arranged at one end of the liquid cooling plate body 321a in a direction perpendicular to the extension direction of the liquid cooling flow channel 322, so that the cross section of the liquid cooling fin 321 is in T-shaped structure (not shown in the figure).

[0056] In another embodiment, referring to Figure 3 , the liquid cooling fin 321 is provided with two liquid cooling fin wings 321b arranged at two ends in a direction perpendicular to the extension direction of the liquid cooling flow channel 322, so that the cross section of the liquid cooling fin 321 is in H-shaped structure.

[0057] In this scheme, two or more battery cells 310 are arranged on both sides of the liquid cooling fin 321, and the main surface 311 of the battery cell 310 is fixed with the surface of the liquid cooling fin 321 through the heat-conducting structural adhesive.

[0058] The heat-conducting structural adhesive is a special adhesive widely used in power batteries, which not only has the bonding function of traditional adhesives, but also has excellent heat-conducting performance. This material is used for bonding between the main surface 311 of the battery cell 310 and the liquid cooling fin 321, which is used to ensure that the heat inside the battery can be effectively conducted into the liquid cooling flow channel 322, thereby improving the safety and service life of the battery.

[0059] Preferably, the sealing edge 312 of the battery cell 310 and the liquid cooling fin wing 321b are also fixed by the heat-conducting structural adhesive.

[0060] The scheme also includes an FPC support 330 and a tab welding support 340, the FPC support 330 is provided with an FPC adapter copper bar 331, and the tab welding support 340 is provided with a tab copper bar 341.

[0061] The battery cells 310 on the liquid cooling fin 321 are arranged in multiple vertical series, and each battery cell 310 includes a tab 313. The tabs 313 between two adjacent battery cells 310 on the same side of the liquid cooling fin 321 are overlapped and extended to the end of the liquid cooling fin 321 along the height direction through the FPC adapter copper bar 331. The tabs 313 between the battery cells 310 on both sides of the end of the liquid cooling fin 321 are electrically connected through the tab copper bar 341.

[0062] FPC refers to Flexible Printed Circuit in this scheme. It is a kind of printed circuit board made of flexible substrate, which can be bent or folded to a certain extent to adapt to narrow or curved space. In this scheme, the FPC adapter copper bar 331 on the FPC support 330 functions to electrically connect the top or bottom surface of the battery cell 310 to the battery management system (BMS), facilitating the FPC to collect voltage, etc.

[0063] FPC has the advantages of light weight, small size, and flexibility, and is very suitable for application in power battery systems with limited space and high energy density requirements. In addition, FPC can also be customized according to actual needs to provide different electrical performance and mechanical characteristics to meet the use requirements in different application scenarios. By using FPC, the overall performance and reliability of the battery liquid cooling assembly 320 can be improved, and a more compact design can also be achieved.

[0064] This scheme also includes a positioning structure 350 for fixing the FPC support 330 on the liquid cooling fin 321. The liquid cooling fin 321 includes two oppositely arranged first and second liquid cooling fin wings. (In this scheme, refer to Figure 2 The lower liquid cooling fin wing 321b is defined as the first liquid cooling fin wing, and the upper liquid cooling fin wing 321b is defined as the second liquid cooling fin wing. The positioning structure 350 includes a positioning hole 351 provided on the first liquid cooling fin wing, and a positioning column matching the positioning hole 351 provided on the FPC support 330; a buckle 352 provided on the second liquid cooling fin wing, and a clamping groove 332 provided on the FPC support 330, the buckle 352 and the clamping groove 332 forming a clamping structure.

[0065] During installation, the FPC support 330 is preliminarily positioned by inserting the positioning column on the FPC support 330 into the positioning hole 351 on the first liquid cooling fin. Then, the position of the FPC support 330 is adjusted gently, and the buckle 352 on the second liquid cooling fin is aligned and inserted into the clamping groove 332 on the FPC support 330, thereby completing the fixation of the FPC support 330 on the liquid cooling fin 321.

[0066] The scheme also provides a battery module unit 300, comprising: the liquid cooling assembly 320 for the battery; the liquid cooling plug 360, the liquid cooling fin 321 is provided with the liquid cooling plug 360 at both ends along the extension direction of the liquid cooling flow channel 322, and the liquid cooling plug 360 is used to constitute the fluid inlet and outlet of the liquid cooling flow channel 322.

[0067] In the scheme, the liquid cooling plug 360 can be fixed on the liquid cooling fin 321 by welding. Before welding, the installation accuracy of the liquid cooling plug 360 can be improved by arranging a positioning member between the liquid cooling plug 360 and the liquid cooling fin 321. Of course, if the liquid cooling fin 321 is provided with the tab welding support 340 at both ends, the tab welding support 340 can be designed to have a relief structure, so that the liquid cooling plug 360 is more easily installed on the liquid cooling fin.

[0068] In one embodiment, the liquid cooling plug 360 can be internally machined to have grooves with different depths according to the requirements of the liquid cooling circuit. The grooves can cooperate with the liquid cooling flow channel 322 in the liquid cooling fin 321, so as to form the liquid cooling circuit.

[0069] In another embodiment, the deformable section 322a in the liquid cooling fin 321 can be directly cut, and the liquid cooling plug 360 with grooves with uniform thickness can also be used to form the liquid cooling circuit.

[0070] The scheme also provides a battery, comprising: a plurality of battery module units 300 according to claim 9, the plurality of battery module units 300 are electrically connected by series copper bars, and the heat insulation material 210 is arranged between the connected battery module units 300; the liquid cooling straight pipe 220, the liquid cooling plugs 360 on the same side of the plurality of battery module units 300 are communicated through the liquid cooling straight pipe 220; the liquid cooling pipe 230, each liquid cooling straight pipe 220 is connected with one liquid cooling pipe 230, and is used to form the circulating cooling system 200.

[0071] Reference Figure 7 And Figure 8 The battery in the scheme also comprises a shell structure 100 for bearing the battery module unit 300, the shell structure 100 comprises a lower box body 120 and an upper cover 110, and a relative sealing space is formed between the lower box body 120 and the upper cover 110, which is used to provide dustproof and primary waterproof effects for the internal battery module unit 300. The front cross beam 130 and the rear cross beam 140 are arranged in the lower box body 120, and when the plurality of battery module units 300 are installed in the lower box body 120, the front cross beam 130 and the rear cross beam 140 abut on the battery module units 300 at both ends respectively, so as to provide support and protection for the battery module units 300.

[0072] The battery module units 300 are isolated from each other by the heat insulation material 210 to prevent thermal runaway from spreading from one unit to another.

[0073] The battery of the present solution comprises a first flexible printed circuit board 410, a second flexible printed circuit board 420 and a third flexible printed circuit board 430. The first and second flexible printed circuit boards 420 are located on both sides of the third flexible printed circuit board 430, wherein the first flexible printed circuit board 410 is welded with the tab copper bars 341 on one side of the plurality of battery module units 300, the second flexible printed circuit board 420 is welded with the tab copper bars 341 on the other side, and the third flexible printed circuit board 430 is welded with the plurality of FPC adapter copper bars 331 on the plurality of battery module units 300. Finally, the protection of the two flexible printed circuit boards is completed by arranging the first copper bar cover plate 440 and the second copper bar cover plate 440 on the first and second flexible printed circuit boards 420 respectively, thereby constructing the power transmission and signal acquisition system 400 of the battery. Each battery module unit 300 is configured with a liquid cooling plug 360, and each liquid cooling plug 360 is provided with a water nozzle 361. The liquid cooling straight pipe 220 connects the water nozzles 361 on the same side of the plurality of battery module units 300 to connect the liquid cooling plugs 360, and then forms the circulating cooling system 200 of the entire battery through the connection of the liquid cooling pipe 230.

[0074] The battery pack heat exchange efficiency is significantly improved by optimizing the design of the liquid cooling fin 321, and the cell 310 expansion problem is solved.

[0075] It should be noted that the description such as "first", "second", "one" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited. The terms "connection", "fixing" and the like should be understood in a broad sense, for example, "fixing" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0076] In addition, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of the technical solutions appears contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is not within the protection scope required by the present application.

[0077] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A liquid cooling assembly for a battery, characterized by, The liquid cooling fin includes: A liquid cooling fin, an outer side wall of which is used for fixing the battery cell, and an inner part of the liquid cooling fin is provided with a liquid cooling flow channel, the liquid cooling flow channel includes a deformable section, the deformable section is arranged at intervals along a direction perpendicular to an extension direction of the liquid cooling flow channel, the deformable section forms a heat exchange passage for fluid passing, and the deformable section has a continuous undulating structure. The deformable section with the continuous undulating structure is used for absorbing lateral extrusion force generated by the battery cell expansion.

2. A liquid cooling assembly for a battery as claimed in claim 1, wherein, The liquid cooling flow channel includes a limiting section, the limiting section is provided with limiting protrusions arranged at intervals, the limiting protrusions extend along an inner wall of the liquid cooling flow channel, and an interval distance between an end of the limiting protrusion and the inner wall of the liquid cooling flow channel is positively correlated with an elastic deformation amount of the deformable section, and the limiting protrusion is used for restricting a lateral contraction amplitude of the liquid cooling flow channel.

3. A liquid cooling assembly for a battery as claimed in claim 2, wherein, The continuous undulating structure of the deformable section is one of a wave shape, a sawtooth shape or a sine wave shape. A cross section of the limiting protrusion is a trapezoidal shape.

4. A liquid cooling assembly for a battery as claimed in claim 1, wherein, The liquid cooling fin includes a liquid cooling plate body and a liquid cooling fin wing piece, the liquid cooling fin wing piece is arranged at one end or both ends of the liquid cooling plate body along a direction perpendicular to the extension direction of the liquid cooling flow channel, so that a cross section of the liquid cooling fin is in a T-shaped structure or an I-shaped structure.

5. A liquid cooling assembly for a battery as claimed in claim 1, wherein, Two or more battery cells are arranged on both sides of the liquid cooling fin, and main surfaces of the battery cells are fixed to surfaces of the liquid cooling fin through a heat conduction structure adhesive.

6. A liquid cooling assembly for a battery as claimed in claim 5 wherein, An FPC support is further included, and the FPC support is provided with an FPC adapter copper bar. The battery cells on the liquid cooling fin are arranged in a vertical series connection, each battery cell includes a tab, the tabs between two adjacent battery cells on the same side of the liquid cooling fin are overlapped, and the tabs are extended to an end of the liquid cooling fin in a height direction through the FPC adapter copper bar.

7. A liquid cooling assembly for a battery as claimed in claim 5 wherein, An tab welding support is further included, and the tab welding support is provided with a tab copper bar, and the tabs between the battery cells on both sides of the end of the liquid cooling fin are electrically connected through the tab copper bar.

8. A liquid cooling assembly for a battery as claimed in claim 6 wherein, A positioning structure is further included, and the FPC support is fixed to the liquid cooling fin through the positioning structure, the liquid cooling fin includes a first liquid cooling fin wing piece and a second liquid cooling fin wing piece arranged oppositely, and the positioning structure includes: A positioning hole arranged on the first liquid cooling fin wing piece, and a positioning column matched with the positioning hole arranged on the FPC support; A buckle arranged on the second liquid cooling fin wing piece, and a clamping groove arranged on the FPC support, and the buckle and the clamping groove form a clamping structure.

9. A battery module unit, characterized by, The liquid cooling assembly for the battery includes: The liquid cooling assembly for the battery according to any one of claims 1 to 8; Liquid cooling plugs, the liquid cooling plugs are arranged at both ends of the liquid cooling fin along the extension direction of the liquid cooling flow channel, and the liquid cooling plugs are used for forming fluid inlets and outlets of the liquid cooling flow channel.

10. A battery, characterized by The battery module unit includes: A plurality of the battery module units according to claim 9, the battery module units are electrically connected through series connection copper bars, and heat insulation materials are arranged between the connected battery module units; Liquid cooling straight pipes, the liquid cooling plugs on the same side of the battery module units are connected through the liquid cooling straight pipes; Liquid cooling pipes, each liquid cooling straight pipe is connected with one liquid cooling pipe, and the liquid cooling pipes are used for forming a circulating cooling system.

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