Battery pack and electric equipment

Abstract

The invention provides a battery pack and electric equipment, and relates to the technical field of new energy. The battery pack provided by the invention comprises a box body which is provided with an accommodating cavity; the liquid cooling assembly comprises a plurality of liquid cooling plates arranged in the containing cavity at intervals, the liquid cooling plates and the box body are relatively fixed, cooling flow channels are formed in the liquid cooling plates, the cooling flow channels of the liquid cooling plates are sequentially communicated, the liquid cooling plates are provided with protruding parts, and the protruding parts protrude relative to the plate body sides of the liquid cooling plates in the width direction of the box body; the battery core group comprises a plurality of battery core groups which are sequentially arranged along the width direction of the accommodating cavity, each battery core group is positioned between two adjacent liquid cooling plates, each battery core group comprises a plurality of battery core monomers which are sequentially arranged along the length direction of the accommodating cavity, and the bottom surfaces of the battery core monomers are adhered to the box body and are lapped on the convex parts; at least one side surface of the battery cell monomer along the length direction of the battery cell monomer is adhered to the liquid cooling plate. According to the battery pack provided by the invention, the use amount of the adhesive between the battery cell group and the liquid cooling plate is small, and the structural stability of the battery pack is good.

Description

Technical Field

[0001] The present application relates to the field of new energy technology, and in particular to a battery pack and electrical equipment. Background Art

[0002] Cell To Pack (CTP) technology directly integrates the battery cells into the battery pack, eliminating the traditional module structure, thereby improving the energy density and production efficiency of the battery pack.

[0003] CTP technology has been widely used due to its many advantages. However, the flatness of the bottom of the battery pack using this technology is difficult to control, which can easily lead to unstable fixation of the battery cells in the battery pack. Usually a large amount of glue is needed to fix the battery cells. If excessive glue is used, the structural stability of the battery pack is still insufficient. Summary of the invention

[0004] The present application provides a battery pack and electrical equipment, wherein the amount of adhesive used between the battery cell group and the liquid cooling plate in the battery pack is small, and the bottom structure stability of the battery pack box is good.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A first aspect of the present application provides a battery pack, comprising:

[0007] A box body having a containing cavity;

[0008] A liquid cooling assembly, comprising a plurality of liquid cooling plates arranged at intervals in the accommodating cavity, wherein the liquid cooling plates are relatively fixed to the box body, wherein a cooling channel is arranged in the liquid cooling plate, wherein the cooling channels of the plurality of liquid cooling plates are sequentially connected, wherein the liquid cooling plate has a protruding portion, and along the width direction of the box body, the protruding portion protrudes relative to one side of the plate body of the liquid cooling plate;

[0009] The battery cell group includes a plurality of battery cell subgroups arranged in sequence along the width direction of the accommodating cavity, each of the battery cell subgroups is located between two adjacent liquid cooling plates, and the battery cell subgroup includes a plurality of battery cell monomers arranged in sequence along the length direction of the accommodating cavity, the bottom surface of the battery cell monomer is bonded to the box body and overlapped on the protrusion, and at least one side surface of the battery cell monomer along its own length direction is bonded to the liquid cooling plate.

[0010] In a possible implementation, the cooling channel includes a liquid inlet channel and a liquid outlet channel that are connected, and the liquid cooling plate is provided with the liquid inlet channel and the liquid outlet channel;

[0011] The liquid cooling assembly also includes a plurality of flow dividers, each of which has a liquid inlet and a liquid outlet. The plurality of flow dividers are fixed one by one to the ends of the plurality of liquid cooling plates, the liquid inlet is connected to the liquid inlet channel, and the liquid outlet is connected to the liquid outlet channel.

[0012] In a possible implementation, the plurality of flow dividers include a first flow divider and a second flow divider, there are two first flow dividers, the first flow divider includes a first flow divider plate, a main joint and two first series joints, the main joint is provided with the liquid inlet, and the first series joint is provided with the liquid outlet;

[0013] Along the width direction of the box body, the two first manifolds are respectively fixedly connected to the liquid cooling plates located at both ends of the accommodating cavity, and the first manifold is relatively fixed to the box body, the main joint and the two first series joints are both fixedly connected to the first manifold, the main joints of the two first manifolds are respectively used for the introduction and export of the cooling liquid, one end of the two first series joints are both connected to the main joint, and the other ends of the two first series joints are respectively connected to the liquid inlet flow channel and the liquid outlet flow channel;

[0014] The second diverter includes a second diverter plate and two second joint groups fixed on opposite sides of the second diverter plate, each of the second joint groups includes two second series joints, the second diverter plate is fixedly connected to the liquid cooling plate located between the two first diverters, and the second diverter plate is relatively fixed to the box body, the two second series joints are respectively connected to the liquid inlet channel and the liquid outlet channel of the liquid cooling plate, the other ends of the two second series joints are respectively connected to the liquid inlet channel and the liquid outlet channel of adjacent liquid cooling plates, and the two second series joints are respectively provided with the liquid inlet and the liquid outlet.

[0015] In a possible implementation, the first flow divider further includes a first support plate, the first support plate is fixedly connected to the first flow divider plate, the first support plate has two first extensions, along the thickness direction of the first flow divider plate, the two first extensions extend toward opposite sides of the first flow divider plate, and the first extensions are provided with first through holes;

[0016] The second flow divider further includes a second support plate, the second support plate is fixedly connected to the second flow divider plate, the second support plate has two second extensions, along the thickness direction of the second flow divider plate, the two second extensions extend toward opposite sides of the second flow divider plate, and the second extensions are provided with second through holes;

[0017] A first crossbeam is fixed in the box body, and the first crossbeam is arranged close to the inner wall on the opposite side of the box body. A plurality of first mounting grooves and a plurality of first connecting holes are arranged at intervals on the first crossbeam. The first diverter plate and the second diverter plate are both snapped into the first mounting groove so that the first extension portion and the second extension portion overlap the first crossbeam. The first diverter and the second diverter are respectively fixed to the first crossbeam by fasteners passing through the first through hole and the first connecting hole.

[0018] In a possible implementation, the liquid cooling assembly further includes a plurality of blocking members, each of the blocking members includes a main body portion and a connecting portion connected to each other, the main body portion is sealed and fixed to an end of the liquid cooling plate away from the diverter, and the connecting portion is provided with a third through hole;

[0019] A second crossbeam is also fixedly provided in the box body, and the second crossbeam is located on a side opposite to the first crossbeam. A plurality of second mounting grooves and a plurality of second connecting holes are provided on the second crossbeam at intervals. The main body is snapped into the second mounting groove so that the connecting portion overlaps the second crossbeam, and the blocking member is fixed to the second crossbeam by a fastener passing through the third through hole and the second connecting hole.

[0020] In a possible implementation, a third crossbeam is fixedly provided in the box body, and along the length direction of the box body, the third crossbeam divides the accommodating cavity into a first sub-cavity and a second sub-cavity;

[0021] The battery cell subgroup includes a first core group, a second core group and a middle end plate, the first core group and the second core group are connected through the middle end plate, the first core group and the second core group are respectively located in the first sub-cavity and the second sub-cavity, the middle end plate is overlapped on the third crossbeam, and the first core group and the second core group each include a plurality of the battery cell monomers.

[0022] In a possible implementation, the liquid cooling plate includes a first flow channel plate, a connecting plate, and a second flow channel plate, the first flow channel plate and the second flow channel plate are both provided with the protrusion, the liquid inlet flow channel of the liquid cooling plate includes a first liquid inlet section, a second liquid inlet section, and a third liquid inlet section, the liquid outlet flow channel includes a first liquid outlet section, a second liquid outlet section, and a third liquid outlet section, the first flow channel plate is provided with the first liquid inlet section and the first liquid outlet section, the connecting plate is provided with the second liquid inlet section and the second liquid outlet section, and the second flow channel plate is provided with the third liquid inlet section and the third liquid outlet section;

[0023] The first flow channel plate is fixedly connected to the second flow channel plate through the connecting plate, so that the first liquid inlet section, the second liquid inlet section and the third liquid inlet section are connected, and the first liquid outlet section, the second liquid outlet section and the third liquid outlet section are connected.

[0024] In a possible implementation, a first boss is provided on the first manifold plate and / or the second manifold plate, a first socket is provided on the first flow channel plate, the first socket is connected to the first liquid inlet section and the first liquid outlet section, and the first boss is plugged and fixed to the first socket;

[0025] And / or, two second bosses are provided on the connecting plate, and the two second bosses are respectively located on opposite sides of the connecting plate, and the first flow channel plate and the second flow channel plate are respectively provided with a second socket and a third socket, the second socket is connected to the second liquid inlet section and the second liquid outlet section, and the third socket is connected to the third liquid inlet section and the third liquid outlet section, and the two second bosses are respectively plugged and fixed to the second socket and the third socket.

[0026] In a possible implementation, along the width direction of the box, extending walls are fixedly provided on inner walls on two opposite sides of the box, and the liquid cooling plate is bonded to the extending walls.

[0027] In a possible implementation manner, a rubber stopper is fixed on the protruding portion, and the rubber stopper is in contact with the battery cell unit.

[0028] The battery pack provided in the first aspect of the present application includes at least the following beneficial effects:

[0029] The side surfaces of the battery cells in the battery pack of the present application are bonded to the liquid cooling plate along the length direction, that is, the narrow sides of the battery cells are bonded to the liquid cooling plate. Compared with bonding the longer side surfaces along the width direction to the liquid cooling plate, the amount of adhesive used is significantly reduced, thereby reducing the cost of the entire pack. Moreover, the battery cells are overlapped on the protruding portion of the liquid cooling plate through the bottom and bonded and fixed to the bottom of the box. The protruding portion of the liquid cooling plate serves as an effective buffer area between the battery cells and the bottom of the box, thereby improving the protection capability of the bottom side of the battery pack and facilitating improving the thermal insulation effect of the bottom of the battery pack. Furthermore, multiple liquid cooling plates are fixed in the box at intervals, and can serve as structural support beams of the box, thereby ensuring the cooling effect of the battery cell group and improving the mechanical strength of the battery pack.

[0030] A second aspect of the present application provides an electrical device, comprising a battery pack provided by any of the above technical solutions.

[0031] The electrical equipment provided in the second aspect of the present application has all the beneficial effects of the battery pack provided in the first aspect of the present application, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 A schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0034] Figure 2 An exploded view of a battery pack provided in an embodiment of the present application;

[0035] Figure 3 for Figure 2 Schematic diagram of the structure of the liquid cooling plate;

[0036] Figure 4 for Figure 3 Cross-sectional structural diagram;

[0037] Figure 5 for Figure 2 A schematic diagram of the structure of the first shunt;

[0038] Figure 6 for Figure 2 A schematic diagram of the structure of the second shunt;

[0039] Figure 7 for Figure 3 Structural diagram of the middle connecting plate;

[0040] Figure 8 for Figure 3 A schematic diagram of the structure of the middle plugging member;

[0041] Fig. 9 for Figure 1 The structural diagram of the middle box;

[0042] Fig.10 A schematic diagram showing the assembly structure between the battery cell group and the liquid cooling plate;

[0043] Fig.11 It is a schematic diagram showing the assembly structure of the extended wall of the box and the liquid cooling plate.

[0044] Description of reference numerals:

[0045] 100, box body; 110, accommodating chamber; 111, first sub-chamber; 112, second sub-chamber; 120, first beam; 121, first mounting groove; 130, second beam; 131, second mounting groove; 140, third beam; 150, extension wall; 200, liquid cooling assembly; 210, liquid cooling plate; 211, cooling channel; 2111, liquid inlet channel; 2112, liquid outlet channel; 212 , protrusion; 213, first flow channel plate; 2131, first liquid inlet section; 2132, first liquid outlet section; 214, connecting plate; 2141, second liquid inlet section; 2142, second liquid outlet section; 2143, second boss; 215, second flow channel plate; 2151, third liquid inlet section; 2152, third liquid outlet section; 216, rubber stopper; 220, diverter; 221, liquid inlet; 222, outlet Liquid inlet; 223, first shunt; 2231, first shunt plate; 2232, main joint; 2233, first series joint; 2234, first support plate; 2234a, first extension; 2234b, first through hole; 224, second shunt; 2241, second shunt plate; 2242, second joint group; 2243, second series joint; 2244, second support plate; 2244a, second extension; 2244b, second through hole; 225, first boss; 230, plugging member; 231, main body; 232, connecting part; 233, third through hole; 240, liquid cooling tube; 300, battery cell group; 310, battery cell subgroup; 311, battery cell monomer; 312, first core group; 313, second core group; 314, middle end plate; 400, buffer pad; 500, fastener.

[0046] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0047] As described in the background technology, the cell-to-pack (CTP) technology directly integrates the battery cells into the battery pack, eliminating the traditional module structure, thereby improving the energy density and production efficiency of the battery pack.

[0048] CTP technology has been widely used due to its many advantages. However, the flatness of the bottom of the battery pack using this technology is difficult to control, which can easily lead to unstable fixation of the battery cells in the battery pack. Usually a large amount of glue is needed to fix the battery cells. When excessive glue is used, the structural stability of the battery pack is still insufficient. The inventors have found that the main reason for this problem is that there are fewer load-bearing parts in the battery pack in CTP technology, the structural strength of the battery pack is low, and the bottom structural stability of the battery pack is weak.

[0049] In response to the above technical problems, the embodiments of the present application provide a battery pack and an electrical device, in which the side surfaces of the battery cells in the battery pack along the length direction are bonded to the liquid cooling plate, that is, the narrow sides of the battery cells are bonded to the liquid cooling plate. Compared with bonding the longer side surfaces along the width direction to the liquid cooling plate, the amount of adhesive used is significantly reduced, thereby reducing the cost of the entire pack. Moreover, the battery cells are overlapped on the protrusions of the liquid cooling plate through the bottom and bonded to the bottom of the box. The protrusions of the liquid cooling plate serve as an effective buffer area between the battery cells and the bottom of the box, thereby improving the protection capability of the bottom side of the battery pack and facilitating improving the thermal insulation effect of the bottom of the battery pack. Furthermore, multiple liquid cooling plates are fixed in the box at intervals, and can serve as structural support beams of the box, thereby ensuring the cooling effect of the battery cell group and improving the mechanical strength of the battery pack.

[0050] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of this application.

[0051] refer to Figures 1 to 11 The battery pack provided in the embodiment of the present application includes: a box body 100 having a receiving cavity 110; a liquid cooling assembly 200 including a plurality of liquid cooling plates 210 spaced apart in the receiving cavity 110, wherein the liquid cooling plates 210 are relatively fixed to the box body 100, a cooling channel 211 is provided in the liquid cooling plate 210, and the cooling channels 211 of the plurality of liquid cooling plates 210 are sequentially connected, and the liquid cooling plate 210 has a protrusion 212, and along the width direction of the box body 100, the protrusion 212 is relative to the plate body of the liquid cooling plate 210 Side protrusion; the battery cell group 300 includes a plurality of battery cell subgroups 310 arranged in sequence along the width direction of the accommodating cavity 110, each battery cell subgroup 310 is located between two adjacent liquid cooling plates 210, and the battery cell subgroup 310 includes a plurality of battery cell monomers 311 arranged in sequence along the length direction of the accommodating cavity 110, the bottom surface of the battery cell monomer 311 is bonded to the box body 100 and overlapped on the protrusion 212, and at least one side surface of the battery cell monomer 311 along its own length direction is bonded to the liquid cooling plate 210.

[0052] Furthermore, protrusions 212 are fixed on opposite sides of the liquid cooling plate 210 , that is, the orthographic projection of the liquid cooling plate 210 along its length direction is T-shaped.

[0053] In some embodiments, the cooling channel 211 includes a liquid inlet channel 2111 and a liquid outlet channel 2112 that are connected to each other, and the liquid inlet channel 2111 and the liquid outlet channel 2112 are provided in the liquid cooling plate 210; the liquid cooling component 200 also includes a plurality of diverter components 220, the diverter components 220 have a liquid inlet 221 and a liquid outlet 222, and the plurality of diverter components 220 are respectively fixed one by one to the ends of the plurality of liquid cooling plates 210, the liquid inlet 221 is connected to the liquid inlet channel 2111, and the liquid outlet 222 is connected to the liquid outlet channel 2112.

[0054] In some embodiments, the plurality of diverter elements 220 include a first diverter 223 and a second diverter 224, there are two first diverters 223, the first diverter 223 includes a first diverter plate 2231, a main connector 2232 and two first series connectors 2233, the main connector 2232 is provided with a liquid inlet 221, and the first series connector 2233 is provided with a liquid outlet 222.

[0055] Along the width direction of the box body 100, the two first diverter plates 2231 are respectively fixedly connected to the liquid cooling plate 210 located at the two ends of the accommodating cavity 110, and the first diverter plate 2231 is relatively fixed to the box body 100, the main joint 2232 and the two first series joints 2233 are both fixedly connected to the first diverter plate 2231, the main joints 2232 of the two first diverters 223 are respectively used for the introduction and export of the cooling liquid, one end of the two first series joints 2233 are connected to the main joint 2232, and the other ends of the two first series joints 2233 are respectively connected to the liquid inlet channel 2111 and the liquid outlet channel 2112.

[0056] The second diverter 224 includes a second diverter plate 2241 and two second joint groups 2242 fixed on opposite sides of the second diverter plate 2241, each second joint group 2242 includes two second series joints 2243, the second diverter plate 2241 is fixedly connected to the liquid cooling plate 210 located between the two first diverters 223, and the second diverter plate 2241 is relatively fixed to the box body 100, the two second series joints 2243 are respectively connected to the liquid inlet channel 2111 and the liquid outlet channel 2112 of the liquid cooling plate 210, the other ends of the two second series joints 2243 are respectively connected to the liquid inlet channel 2111 and the liquid outlet channel 2112 of the adjacent liquid cooling plate 210, and the two second series joints 2243 are respectively provided with a liquid inlet 221 and a liquid outlet 222.

[0057] It should be noted that, combined with Figure 1 and Figure 2Along the width direction of the box body 100, the coolant enters the liquid inlet channel 2111 through the liquid inlet 221 of the main joint 2232 of the first diverter 223 located on the uppermost liquid cooling plate 210, and enters the multiple liquid cooling plates 210 in turn through the second series joints 2243 of the multiple second diverters 224. After circulating in the multiple liquid cooling plates 210 for one week, it flows into the liquid outlet channel 2112, and flows out through the liquid outlet 222 of the main joint 2232 of the first diverter 223 of the lowermost liquid cooling plate 210, completing a cooling cycle.

[0058] Furthermore, the first diverter 223 and the second diverter 224 are connected through the liquid cooling pipe 240. Specifically, multiple liquid cooling pipes 240 are respectively connected to the first series joint 2233 of the first diverter 223 and the second series joint 2243 of the second diverter 224 of the multiple liquid cooling plates 210, as well as between the second series joint 2243 and the second series joint 2243, so as to play a role in good cooling liquid transfer.

[0059] In some embodiments, the first diverter 223 also includes a first support plate 2234, which is fixedly connected to the first diverter plate 2231. The first support plate 2234 has two first extensions 2234a. Along the thickness direction of the first diverter plate 2231, the two first extensions 2234a extend toward opposite sides of the first diverter plate 2231, and a first through hole 2234b is provided on the first extension 2234a.

[0060] The second diverter 224 also includes a second support plate 2244, which is fixedly connected to the second diverter plate 2241. The second support plate 2244 has two second extensions 2244a. Along the thickness direction of the second diverter plate 2241, the two second extensions 2244a extend toward opposite sides of the second diverter plate 2241, and a second through hole 2244b is provided on the second extension 2244a.

[0061] A first crossbeam 120 is fixed inside the box body 100, and the first crossbeam 120 is arranged close to the inner wall on the opposite side of the box body 100. A plurality of first mounting grooves 121 and a plurality of first connecting holes are arranged at intervals on the first crossbeam 120. The first diverter plate 2231 and the second diverter plate 2241 are both snapped into the first mounting groove 121 so that the first extension portion 2234a and the second extension portion 2244a overlap the first crossbeam 120. The first diverter 223 and the second diverter 224 are respectively fixed to the first crossbeam 120 by fasteners passing through the first through hole 2234b and the first connecting hole.

[0062] In some embodiments, the liquid cooling assembly 200 further includes a plurality of sealing members 230 , each sealing member 230 includes a main body 231 and a connecting portion 232 connected to each other, the main body 231 is sealed and fixed to one end of the liquid cooling plate 210 away from the diverter 220 , and a third through hole 233 is provided on the connecting portion 232 .

[0063] A second crossbeam 130 is also fixedly installed in the box body 100. The second crossbeam 130 is located on a side opposite to the first crossbeam 120. A plurality of second mounting grooves 131 and a plurality of second connecting holes are arranged at intervals on the second crossbeam 130. The main body 231 is snapped into the second mounting groove 131 so that the connecting portion 232 overlaps the second crossbeam 130. The blocking member 230 is fixed to the second crossbeam 130 by a fastener 500 which is passed through the third through hole 233 and the second connecting hole.

[0064] In this way, the liquid cooling plate 210 and the second crossbeam 130 can be fixed, and the battery cell group 300 can be further fixed in the box body 100 .

[0065] In some embodiments, a third crossbeam 140 is fixedly disposed in the box body 100 . Along the length direction of the box body 100 , the third crossbeam 140 divides the accommodating cavity 110 into a first sub-cavity 111 and a second sub-cavity 112 .

[0066] The battery cell subgroup 310 includes a first core group 312, a second core group 313 and a middle end plate 314. The first core group 312 and the second core group 313 are connected through the middle end plate 314. The first core group 312 and the second core group 313 are respectively located in the first sub-cavity 111 and the second sub-cavity 112. The middle end plate 314 is overlapped on the third cross beam 140. The first core group 312 and the second core group 313 each include a plurality of battery cell monomers 311. Furthermore, the middle end plate 314 has a U-shaped slot. The middle end plate 314 is fixed to the third cross beam 140 through the U-shaped slot to separate the two core groups.

[0067] In some embodiments, the liquid cooling plate 210 includes a first flow channel plate 213, a connecting plate 214 and a second flow channel plate 215, the first flow channel plate 213 and the second flow channel plate 215 are both provided with a protrusion 212, the liquid inlet channel 2111 of the liquid cooling plate 210 includes a first liquid inlet section 2131, a second liquid inlet section 2141 and a third liquid inlet section 2151, the liquid outlet channel 2112 includes a first liquid outlet section 2132, a second liquid outlet section 2142 and a third liquid outlet section 2152, the first flow channel plate 213 is provided with a first liquid inlet section 2131 and a first liquid outlet section 2132, the connecting plate 214 is provided with a second liquid inlet section 2141 and a second liquid outlet section 2142, and the second flow channel plate 215 is provided with a third liquid inlet section 2151 and a third liquid outlet section 2152.

[0068] The first flow channel plate 213 is fixedly connected to the second flow channel plate 215 via the connecting plate 214 , so that the first liquid inlet section 2131 , the second liquid inlet section 2141 and the third liquid inlet section 2151 are connected, and the first liquid outlet section 2132 , the second liquid outlet section 2142 and the third liquid outlet section 2152 are connected.

[0069] In some embodiments, a first boss 225 is provided on the first diverter plate 2231 and / or the second diverter plate 2241, and a first socket is provided on the first flow channel plate 213, the first socket is connected to the first liquid inlet section 2131 and the first liquid outlet section 2132, and the first boss 225 is plugged and fixed to the first socket; and / or, two second bosses 2143 are provided on the connecting plate 214, and the two second bosses 2143 are respectively located on opposite sides of the connecting plate 214, and a second socket and a third socket are respectively provided on the first flow channel plate 213 and the second flow channel plate 215, the second socket is connected to the second liquid inlet section 2141 and the second liquid outlet section 2142, the third socket is connected to the third liquid inlet section 2151 and the third liquid outlet section 2152, and the two second bosses 2143 are respectively plugged and fixed to the second socket and the third socket. Exemplarily, the first boss 225 is welded to the first socket, and the two second bosses 2143 are respectively welded to the second socket and the third socket.

[0070] Furthermore, the wall thickness of the main structure of the diverter 220, the liquid cooling plate 210 and the sealing member 230 is greater than or equal to 1 mm. Exemplarily, the wall thickness of the main structure of the diverter 220, the liquid cooling plate 210 and the sealing member 230 may be 2 mm or 3 mm to ensure the structural strength of the battery pack and sufficient cavity flow volume inside the above-mentioned components, thereby ensuring the cooling capacity of the liquid cooling assembly 200.

[0071] In some embodiments, along the width direction of the box body 100 , extension walls 150 are fixedly provided on the inner walls of the box body 100 on two opposite sides, and the liquid cooling plate 210 is bonded to the extension walls 150 .

[0072] In more examples, the first beam 120, the third beam 140 and / or the second beam 130 are all provided with an extension wall 150, the extension wall 150 of the first beam 120 extends toward the first sub-cavity 111, the extension wall 150 of the third beam 140 is arranged on opposite sides of the third beam 140, and extends toward the first sub-cavity 111 and the second sub-cavity 112 respectively, the extension wall 150 of the second beam 130 extends toward the second sub-cavity 112, the first flow channel plate 213 is bonded to the extension wall 150 on one side of the first beam 120 and the third beam 140, and the second flow channel plate 215 is bonded to the extension wall 150 on the other side of the third beam 140 and the extension wall 150 of the second beam 130, so as to further improve the installation stability of the liquid cooling plate 210 at the bottom of the box body 100.

[0073] In some embodiments, a rubber stopper 216 is fixed on the protrusion 212 , and the rubber stopper 216 abuts against the battery cell 311 . Furthermore, the rubber stopper 216 is a rubber stopper strip made of insulating material, for example, plastic or foam material.

[0074] Furthermore, the side surfaces of the battery cell 311 on opposite sides along its own length direction are adhered to the side surfaces of the liquid cooling plate 210 by means of a heat-conductive structural adhesive, and the bottom of the battery cell 311 is overlapped on the protrusion 212. In this way, the adhesive strip on the protrusion 212 of the flow channel plate can prevent the glue from overflowing from the bottom of the battery cell 311, and at the same time prevent the bottom of the battery cell 311 from being scratched by the side of the liquid cooling plate 210, thereby playing a protective insulation role.

[0075] In more examples, a buffer pad is provided at the bottom of the box 100, which is filled between the battery cell group 300 and the bottom of the box 100. The buffer pad is a flexible pad with compressible properties, which can absorb the impact force applied from the bottom of the battery pack, thereby protecting the battery cell group 300. At the same time, the thermal conductivity of the buffer pad is ≤0.3W / m·k, which has a good thermal insulation effect on the bottom of the battery pack.

[0076] In a second aspect, an embodiment of the present application provides an electrical device, which includes a battery pack provided by any embodiment of the first aspect.

[0077] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0082] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery pack, characterized in that: include: The box body (100) has a receiving cavity (110); A liquid cooling assembly (200), comprising a plurality of liquid cooling plates (210) arranged at intervals in the accommodating cavity (110), wherein the liquid cooling plates (210) are relatively fixed to the box body (100), a cooling channel (211) is provided in the liquid cooling plate (210), the cooling channels (211) of the plurality of liquid cooling plates (210) are sequentially connected, and the liquid cooling plate (210) has a protruding portion (212), and along the width direction of the box body (100), the protruding portion (212) protrudes relative to one side of the plate body of the liquid cooling plate (210); A battery cell group (300) comprises a plurality of battery cell subgroups (310) arranged in sequence along the width direction of the accommodating cavity (110), each of the battery cell subgroups (310) being located between two adjacent liquid cooling plates (210), the battery cell subgroup (310) comprising a plurality of battery cell monomers (311) arranged in sequence along the length direction of the accommodating cavity (110), the bottom surface of the battery cell monomer (311) being bonded to the box body (100) and overlapped on the protruding portion (212), and at least one side surface of the battery cell monomer (311) along its own length direction being bonded to the liquid cooling plate (210).

2. The battery pack according to claim 1, characterized in that: The cooling flow channel (211) comprises a liquid inlet flow channel (2111) and a liquid outlet flow channel (2112) which are connected to each other, and the liquid inlet flow channel (2111) and the liquid outlet flow channel (2112) are provided in the liquid cooling plate (210); The liquid cooling assembly (200) further comprises a plurality of flow dividers (220), each of the flow dividers (220) comprising a liquid inlet (221) and a liquid outlet (222), the plurality of flow dividers (220) being fixed one by one to the ends of the plurality of liquid cooling plates (210), the liquid inlet (221) being connected to the liquid inlet channel (2111), and the liquid outlet (222) being connected to the liquid outlet channel (2112).

3. The battery pack according to claim 2, characterized in that: The plurality of flow dividers (220) include a first flow divider (223) and a second flow divider (224); there are two first flow dividers (223); the first flow dividers (223) include a first flow divider plate (2231), a main connector (2232), and two first series connectors (2233); the main connector (2232) is provided with the liquid inlet (221); and the first series connector (2233) is provided with the liquid outlet (222); Along the width direction of the box body (100), the two first flow dividers (2231) are respectively fixedly connected to the liquid cooling plate (210) located at both ends of the accommodating cavity (110), and the first flow divider (2231) is relatively fixed to the box body (100), the main joint (2232) and the two first series joints (2233) are both fixedly connected to the first flow divider (2231), the main joints (2232) of the two first flow dividers (223) are respectively used for the introduction and export of cooling liquid, one end of the two first series joints (2233) are both connected to the main joint (2232), and the other end of the two first series joints (2233) are respectively connected to the liquid inlet channel (2111) and the liquid outlet channel (2112); The second flow divider (224) comprises a second flow divider plate (2241) and two second joint groups (2242) fixed on opposite sides of the second flow divider plate (2241), each of the second joint groups (2242) comprising two second series joints (2243), the second flow divider plate (2241) being fixedly connected to the liquid cooling plate (210) located between the two first flow dividers (223), and the second flow divider plate (2241) and the box body (10 0) are relatively fixed, the two second series joints (2243) are respectively connected to the liquid inlet channel (2111) and the liquid outlet channel (2112) of the liquid cooling plate (210), the other ends of the two second series joints (2243) are respectively connected to the liquid inlet channel (2111) and the liquid outlet channel (2112) of the adjacent liquid cooling plate (210), and the two second series joints (2243) are respectively provided with the liquid inlet port (221) and the liquid outlet port (222).

4. The battery pack according to claim 3, characterized in that: The first flow divider (223) further comprises a first support plate (2234), the first support plate (2234) being fixedly connected to the first flow divider plate (2231), the first support plate (2234) having two first extension portions (2234a), and along the thickness direction of the first flow divider plate (2231), the two first extension portions (2234a) extending toward opposite sides of the first flow divider plate (2231), and the first extension portions (2234a) being provided with first through holes (2234b); The second flow divider (224) further comprises a second support plate (2244), the second support plate (2244) being fixedly connected to the second flow divider plate (2241), the second support plate (2244) having two second extensions (2244a), along the thickness direction of the second flow divider plate (2241), the two second extensions (2244a) extending toward opposite sides of the second flow divider plate (2241), and the second extensions (2244a) being provided with second through holes (2244b); A first crossbeam (120) is fixed inside the box body (100), and the first crossbeam (120) is arranged close to the inner wall on the opposite side of the box body (100), and a plurality of first installation grooves (121) and a plurality of first connecting holes are arranged at intervals on the first crossbeam (120), and the first diverter plate (2231) and the second diverter plate (2241) are both snap-fitted into the first installation groove (121) so that the first protruding portion (2234a) and the second protruding portion (2244a) overlap on the first crossbeam (120), and the first diverter (223) and the second diverter (224) are respectively fixed to the first crossbeam (120) by fasteners penetrating the first through hole (2234b) and the first connecting hole.

5. The battery pack according to claim 4, characterized in that: The liquid cooling assembly (200) further comprises a plurality of blocking members (230), each of the blocking members (230) comprising a main body (231) and a connecting portion (232) connected to each other, the main body (231) being sealed and fixed to an end of the liquid cooling plate (210) away from the diverter member (220), and a third through hole (233) being provided on the connecting portion (232); A second crossbeam (130) is also fixedly arranged in the box body (100), and the second crossbeam (130) is located on a side opposite to the first crossbeam (120). A plurality of second installation grooves (131) and a plurality of second connecting holes are arranged at intervals on the second crossbeam (130). The main body (231) is snap-fitted into the second installation groove (131) so that the connecting portion (232) overlaps the second crossbeam (130), and the blocking member (230) is fixed to the second crossbeam (130) by a fastener penetrating the third through hole (233) and the second connecting hole.

6. The battery pack according to any one of claims 2 to 5, characterized in that: A third crossbeam (140) is fixedly disposed in the box body (100), and along the length direction of the box body (100), the third crossbeam (140) divides the accommodating cavity (110) into a first sub-cavity (111) and a second sub-cavity (112); The battery cell subgroup (310) comprises a first core group (312), a second core group (313) and a middle end plate (314); the first core group (312) and the second core group (313) are connected via the middle end plate (314); the first core group (312) and the second core group (313) are respectively located in the first sub-cavity (111) and the second sub-cavity (112); the middle end plate (314) is overlapped on the third crossbeam (140); and the first core group (312) and the second core group (313) each comprise a plurality of battery cell monomers (311).

7. The battery pack according to claim 6, characterized in that: The liquid cooling plate (210) comprises a first flow channel plate (213), a connecting plate (214) and a second flow channel plate (215); the first flow channel plate (213) and the second flow channel plate (215) are both provided with the protruding portion (212); the liquid inlet flow channel (2111) of the liquid cooling plate (210) comprises a first liquid inlet section (2131), a second liquid inlet section (2141) and a third liquid inlet section (2151); the liquid outlet flow channel (2112) comprises a first a liquid outlet section (2132), a second liquid outlet section (2142) and a third liquid outlet section (2152), the first flow channel plate (213) being provided with the first liquid inlet section (2131) and the first liquid outlet section (2132), the connecting plate (214) being provided with the second liquid inlet section (2141) and the second liquid outlet section (2142), and the second flow channel plate (215) being provided with the third liquid inlet section (2151) and the third liquid outlet section (2152); The first flow channel plate (213) is fixedly connected to the second flow channel plate (215) via the connecting plate (214), so that the first liquid inlet section (2131), the second liquid inlet section (2141) and the third liquid inlet section (2151) are connected, and the first liquid outlet section (2132), the second liquid outlet section (2142) and the third liquid outlet section (2152) are connected.

8. The battery pack according to claim 7, characterized in that: The first diverter plate (2231) and / or the second diverter plate (2241) is provided with a first boss (225), the first flow channel plate (213) is provided with a first socket, the first socket is connected to the first liquid inlet section (2131) and the first liquid outlet section (2132), and the first boss (225) is plugged and fixed to the first socket; And / or, the connecting plate (214) is provided with two second bosses (2143), the two second bosses (2143) are respectively located on opposite sides of the connecting plate (214), the first flow channel plate (213) and the second flow channel plate (215) are respectively provided with a second socket and a third socket, the second socket is connected to the second liquid inlet section (2141) and the second liquid outlet section (2142), the third socket is connected to the third liquid inlet section (2151) and the third liquid outlet section (2152), and the two second bosses (2143) are respectively plugged and fixed to the second socket and the third socket.

9. The battery pack according to any one of claims 1 to 5, characterized in that: Along the width direction of the box body (100), extension walls (150) are fixedly provided on the inner walls of two opposite sides of the box body (100), and the liquid cooling plate (210) is bonded to the extension walls (150).

10. The battery pack according to any one of claims 1 to 5, characterized in that: A rubber stopper (216) is fixed on the protruding portion (212), and the rubber stopper (216) is in contact with the battery cell (311).

11. An electrical device, characterized in that: Comprising a battery pack as described in any one of claims 1-10.

Images