Liquid cooling plate and battery pack

Abstract

The utility model provides a liquid cooling plate and a battery pack. The liquid cooling plate comprises an upper cooling plate, a runner plate and a lower cooling plate which are sequentially stacked, an upper heat exchange runner is defined between the runner plate and the upper cold plate, and a lower heat exchange runner is defined between the runner plate and the lower cold plate; the upper cold plate is provided with a heat exchange area, and orthographic projections of the upper heat exchange runner and the lower heat exchange runner on the upper cold plate are distributed in the heat exchange area; the upper heat exchange flow channel and the lower heat exchange flow channel are mutually independent, and the flowing direction of a medium in the upper heat exchange flow channel is opposite to the flowing direction of a medium in the lower heat exchange flow channel. According to the liquid cooling plate and the battery pack, the upper heat exchange flow channel and the lower heat exchange flow channel are distributed in the heat exchange area, the flowing directions of flowing media in the upper heat exchange flow channel and the lower heat exchange flow channel are opposite, under the combined action of the upper heat exchange flow channel and the lower heat exchange flow channel, the temperatures of all positions in the heat exchange area tend to be the same, and the temperature uniformity of the liquid cooling plate is high.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and particularly relates to a liquid cooling plate and a battery pack. Background Art

[0002] In the related art, the fluid medium in the existing liquid cooling plate usually only flows from one side to the other side in one direction. Since the fluid medium will continuously exchange heat with the battery cells during the flow process (that is, the fluid medium will continuously absorb heat or radiate heat outward), the temperature difference between the liquid inlet side and the liquid outlet side of the existing liquid cooling plate is relatively large. Correspondingly, the heat exchange effects of the existing liquid cooling plate on the battery cells in different regions also vary greatly, and it is difficult to ensure that all the battery cells in the battery pack are maintained within a preset temperature range.

[0003] Therefore, how to improve the temperature uniformity of the liquid cooling plate has become an urgent problem to be solved. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a liquid cooling plate and a battery pack to improve the temperature uniformity of the liquid cooling plate.

[0005] Based on the above purpose, in the first aspect of this application, a liquid cooling plate is provided, which includes an upper cooling plate, a flow channel plate, and a lower cooling plate that are sequentially stacked; an upper heat exchange flow channel is defined between the flow channel plate and the upper cooling plate, and a lower heat exchange flow channel is defined between the flow channel plate and the lower cooling plate; the upper cooling plate has a heat exchange area, the orthographic projection of the upper heat exchange flow channel on the upper cooling plate is distributed in the heat exchange area, and the orthographic projection of the lower heat exchange flow channel on the upper cooling plate is distributed in the heat exchange area; the upper cooling plate or the lower cooling plate is provided with a first liquid inlet port, a second liquid inlet port, a first liquid outlet port, and a second liquid outlet port; the first liquid inlet port and the first liquid outlet port are respectively communicated with the upper heat exchange flow channel, and the second liquid inlet port and the second liquid outlet port are respectively communicated with the lower heat exchange flow channel; the upper heat exchange flow channel and the lower heat exchange flow channel are independent of each other, and the flow direction of the medium in the upper heat exchange flow channel is opposite to the flow direction of the medium in the lower heat exchange flow channel.

[0006] Based on the same inventive concept, in the second aspect of this application, a battery pack is further provided, which includes the liquid cooling plate as described in the first aspect.

[0007] As can be seen from the above, for the liquid cooling plate and the battery pack provided in the present application, the upper heat exchange flow channel and the lower heat exchange flow channel are both distributed in the heat exchange area, and the flow directions of the flowing media in the two are opposite. Then, the relatively higher-temperature part of the upper heat exchange flow channel corresponds to the relatively lower-temperature part of the lower heat exchange flow channel, and the relatively lower-temperature part of the upper heat exchange flow channel corresponds to the relatively higher-temperature part of the lower heat exchange flow channel. Under the combined action of the upper heat exchange flow channel and the lower heat exchange flow channel, the temperatures at various positions in the heat exchange area tend to be the same, and the temperature uniformity of the liquid cooling plate is relatively strong. This helps to keep the battery cells arranged at different positions in the heat exchange area within a preset temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments or related technologies. Obviously, the drawings described below are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0009] Figure 1 Stereoscopic schematic diagram of the battery cell group of the battery cell stack body in the embodiment of the present application;

[0010] Figure 2 Stereoscopic schematic diagram of the battery cell of the battery cell stack body in the embodiment of the present application;

[0011] Figure 3 Front view schematic diagram of the battery cell group of the battery cell stack body in the embodiment of the present application;

[0012] Figure 4 For Figure 3 Sectional view taken along line A-A in

[0013] Figure 5 For Figure 3 Sectional view taken along line B-B in

[0014] Figure 6 For Figure 3 Sectional view taken along line C-C in

[0015] Figure 7 For Figure 3 Sectional view taken along line D-D in

[0016] Figure 8 For Figure 7 Enlarged schematic diagram of part E in

[0017] Figure 9 Stereoscopic schematic diagram of the battery cell group with another structure of the battery cell stack body in the embodiment of the present application;

[0018] Figure 10Schematic perspective view of the battery cell detection device of the first structure according to the embodiment of the present application;

[0019] Figure 11 Smoke exhaust schematic view of the battery cell detection device of the first structure according to the embodiment of the present application;

[0020] Figure 12 Front view schematic view of the battery cell detection device of the first structure according to the embodiment of the present application;

[0021] Figure 13 is Figure 12 Sectional view taken along the F-F section in

[0022] Figure 14 is Figure 13 Enlarged view of part G in

[0023] Figure 15 Sectional view of the connection between the battery cell detection device and the pole column of the battery cell according to the embodiment of the present application;

[0024] Figure 16 Schematic perspective view of the battery cell detection device of the second structure according to the embodiment of the present application;

[0025] Figure 17 Smoke exhaust schematic view of the battery cell detection device of the second structure according to the embodiment of the present application;

[0026] Figure 18 Explosion schematic view of the battery cell detection device of the second structure according to the embodiment of the present application;

[0027] Figure 19 Schematic perspective view of the battery cell group using the battery cell detection device of the first structure according to the embodiment of the present application;

[0028] Figure 20 Schematic perspective view of the battery cell group using the battery cell detection device of the second structure according to the embodiment of the present application;

[0029] Figure 21 Explosion schematic view of the battery cell group using the battery cell detection device of the second structure according to the embodiment of the present application;

[0030] Figure 22 Schematic perspective view of a viewing direction of the external component according to the embodiment of the present application;

[0031] Figure 23 Schematic perspective view of another viewing direction of the external component according to the embodiment of the present application;

[0032] Figure 24 Explosion schematic view of the liquid cooling plate according to the embodiment of the present application;

[0033] Figure 25 isFigure 24 Enlarged schematic view of part J;

[0034] Figure 26 Perspective top view schematic diagram of the liquid cooling plate according to the embodiment of the present application;

[0035] Figure 27 Is Figure 26 Enlarged schematic view of part L;

[0036] Figure 28 Top view schematic diagram of the liquid cooling plate according to the embodiment of the present application;

[0037] Figure 29 Is Figure 28 Sectional view of the M-M section;

[0038] Figure 30 Is Figure 29 Enlarged schematic view of part N;

[0039] Figure 31 Stereoscopic schematic diagram of the battery pack according to the embodiment of the present application;

[0040] Figure 32 Is Figure 31 Enlarged schematic view of part R;

[0041] Figure 33 Explosion schematic diagram of the battery pack according to the embodiment of the present application;

[0042] Figure 34 Is Figure 33 Enlarged schematic view of part S;

[0043] Figure 35 Top view schematic diagram of the battery pack after removing the cover plate according to the embodiment of the present application;

[0044] Figure 36 Explosion schematic diagram of the battery pack containing multiple battery cell groups according to the embodiment of the present application;

[0045] Figure 37 Explosion schematic diagram of multiple battery cell groups according to the embodiment of the present application;

[0046] Figure 38 Stereoscopic schematic diagram of the cover plate, bottom plate and liquid cooling component in the battery pack according to the embodiment of the present application;

[0047] Figure 39 Is Figure 38 Enlarged schematic view of part Q. Detailed implementation manners

[0048] In order to make the objectives, technical solutions and advantages of the present application clearer and more understandable, the following further describes the present application in detail with reference to specific embodiments and the accompanying drawings.

[0049] It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components set forth in these embodiments do not limit the scope of the present application.

[0050] Meanwhile, it should be understood that, for the sake of convenience of description, the sizes of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0051] The following description of at least one exemplary embodiment is merely illustrative in nature and in no way limits the present application, its application, or its use.

[0052] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the art to which the present application pertains. The "first", "second", and similar terms used in the embodiments of the present application do not denote any order, quantity, or importance, but are merely used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0053] In the related art, a plurality of existing battery cells (or battery monomers) are provided in an existing battery pack. In order to electrically connect the plurality of existing battery cells, a bus bar is usually used to connect between the plurality of existing battery cells. The bus bar usually needs to be laser welded to the pole posts of the existing battery cells to electrically connect the existing battery cells and the bus bar. However, the applicant has found that the laser welding process parameters have limitations, the welding performance between different materials needs to be designed and verified, and there is a risk of poor welding, which in turn leads to serious heating and affects the overall performance of the existing battery pack. At the same time, the bus bar also occupies a part of the space inside the existing battery pack, resulting in a decrease in the energy density inside the existing battery pack.

[0054] If the bus bar can be removed and the existing battery cells can be directly connected, then not only will the problem of the overall performance degradation of the existing battery pack caused by poor welding be eliminated, but also the energy density of the existing battery pack can be increased and the cost of the existing battery pack can be reduced.

[0055] In view of this, as Figure 1 and Figure 2As shown in the figure, this embodiment provides a battery cell stack, including: at least one battery cell group 100, each battery cell group 100 including at least two battery cell layers 10 stacked; the battery cell stack includes a plurality of battery cells 20, each battery cell 20 including a battery cell main body 21, the battery cell main body 21 including a connection end 211, the connection end 211 being provided with a first terminal 22 and a second terminal 23, the polarities of the first terminal 22 and the second terminal 23 being opposite; the plurality of battery cells 20 including stacked battery cells 11 for forming the battery cell layer 10, and interlayer connection battery cells 30; the connection ends 211 of the stacked battery cells 11 are disposed opposite to the connection ends 211 of the interlayer connection battery cells 30, so that the first terminal 22 of the interlayer connection battery cell 30 is directly electrically connected to the second terminal 23 of the stacked battery cells 11 in one of the two battery cell layers 10, and the second terminal 23 of the interlayer connection battery cell 30 is directly electrically connected to the first terminal 22 of the stacked battery cells 11 in the other one.

[0056] Exemplarily, the first terminal 22 and the second terminal 23 can be directly electrically connected through a conductive adhesive; or, the first terminal 22 and the second terminal 23 are abutted (for example, by positioning the stacked battery cells 11 and the corresponding interlayer connection battery cells 30) to achieve direct electrical connection between the two.

[0057] Exemplarily, the battery cell 20 can be a square shell battery cell.

[0058] Exemplarily, when the battery cell stack includes at least two battery cell groups 100, the at least two battery cell groups 100 can be electrically connected to each other (for example, in series connection or parallel connection).

[0059] As Figure 2 , the battery cell main body 21 includes two first side walls 212 spaced along its thickness direction (such as the Y1 direction in Figure 2 ), and two second side walls 213 spaced along its width direction (such as the X1 direction in Figure 2 ), the surface area of the first side walls 212 is larger than the surface area of the second side walls 213, and the two first side walls 212 and the two second side walls 213 enclose the circumferential side walls of the battery cell main body 21. The battery cell main body 21 further includes a connection end 211 and a bottom end 214 spaced along its height direction (such as the Z1 direction in Figure 2 ). The first terminal 22 and the second terminal 23 are disposed on the connection end 211 at intervals along the width direction of the battery cell main body 21. Exemplarily, the first terminal 22 is the positive terminal of the battery cell 20, and the second terminal 23 is the negative terminal of the battery cell 20; or, the first terminal 22 is the negative terminal of the battery cell 20, and the second terminal 23 is the positive terminal of the battery cell 20. The connection end 211 is further provided with an explosion-proof valve 24, and the explosion-proof valve 24 is located between the first terminal 22 and the second terminal 23.

[0060] As Figure 3 and Figure 4, in this embodiment, in order to enable the stacked cells 11 between the two cell layers 10 to achieve electrical connection without relying on a busbar, an interlayer connecting cell 30 is provided between the two cell layers 10. The connecting ends 211 of the interlayer connecting cell 30 and the connecting ends 211 of the stacked cells 11 are arranged opposite to each other, so that the ends of the poles (including the first pole 22 and the second pole 23) of the interlayer connecting cell 30 face the ends of the poles of the stacked cells 11, facilitating conductive contact between the two and thus achieving direct electrical connection.

[0061] Taking Figure 4 the structure and direction shown as an example for further illustration, the first pole 22a of the first stacked cell 11a in the upper cell layer 10 is directly electrically connected to the second pole 23 of the interlayer connecting cell 30; the second pole 23c of the third stacked cell 11c in the lower cell layer 10 is directly electrically connected to the first pole 22 of the interlayer connecting cell 30. At this time, the upper and lower cell layers 10 can be connected in series through the interlayer connecting cell 30.

[0062] In the cell stack of this embodiment, by providing an interlayer connecting cell 30 between the two cell layers 10, the first pole 22 of the interlayer connecting cell 30 is directly electrically connected to the second pole 23 of the stacked cells 11 in one of the cell layers 10, and the second pole 23 of the interlayer connecting cell 30 is directly electrically connected to the first pole 22 of the stacked cells 11 in the other cell layer 10, so as to use the interlayer connecting cell 30 as a conductive connection body for connecting the two cell layers 10. In other words, by directly electrically connecting the first pole 22 of one cell 20 and the second pole 23 of another cell 20, the cell 20 is used to replace the busbar in the related art to achieve electrical connection between the two cell layers 10. Through actual comparison by the applicant, compared with the structure of connecting existing cells using a busbar, the battery volume grouping efficiency of the cell stack of this embodiment is increased by at least 4%, the cost is reduced by at least 5%, and the number of components is reduced by more than 25%. At the same time, using the cell stack of this embodiment can reduce the height of the battery system by more than 10%, which helps to increase the space of the passenger compartment of a passenger car.

[0063] For example Figure 1 , in the cell layer 10, the thickness direction of the stacked cells 11 is parallel to the vertical direction. When there are multiple stacked cells 11 in the same cell layer 10, the multiple stacked cells 11 are distributed along their width direction, the connecting ends 211 of the multiple stacked cells 11 are located on the same side, and the second side walls 213 of adjacent two stacked cells 11 are close to each other.

[0064] In the cell group 100, adjacent two cell layers 10 are stacked and distributed along the thickness direction of the stacked cells 11, the connecting ends 211 of the stacked cells 11 in different cell layers 10 are also located on the same side, and the first side walls 212 of the stacked cells 11 in adjacent two cell layers 10 are close to each other.

[0065] As Figure 1 , in some embodiments, in the same cell layer 10, there are at least two stacked cells 11, and two adjacent stacked cells 11 are electrically connected; the inter-layer connecting cell 30 is arranged at one end of the cell layer 10.

[0066] Exemplarily, two adjacent stacked cells 11 in the same cell layer 10 can be electrically connected through a conductive metal sheet; or, they can be electrically connected through a cell 20 in a manner similar to the inter-layer connecting cell 30.

[0067] It should be noted that generally, in the same cell layer 10, along the arrangement direction of the stacked cells 11, the first pole 22 at one end can be used as one output terminal of the cell layer 10, and the second pole 23 at the other end can be used as the other output terminal of the cell layer 10. Specifically, further explanation is made according to the Figure 1 direction. Exemplarily, the pole at the left end of the upper cell layer 10 (i.e., the exposed pole) is the negative pole, and the pole at the right end of the upper cell layer 10 (i.e., the pole connected to the inter-layer connecting cell 30) is the positive pole. The pole at the left end of the lower cell layer 10 is the positive pole, and the pole at the right side of the lower cell layer 10 is the negative pole. The inter-layer connecting cell 30 is located at the right end of the two cell layers 10, and the upper cell layer 10 and the lower cell layer 10 are connected in series through the inter-layer connecting cell 30.

[0068] As Figure 3 and Figure 5 , in the upper cell layer 10, the current (such as the arrow line in Figure 5 ) flows from the negative pole of the stacked cell 11 at the left end to the positive pole of the stacked cell 11 at the right end and finally enters the inter-layer connecting cell 30. As Figure 3 and Figure 6 , after passing through the inter-layer connecting cell 30, the current enters the lower cell layer 10 through the negative pole of the stacked cell 11 at the right end of the lower cell layer 10 and flows to the positive pole of the stacked cell 11 at the left end of the lower cell layer 10. In the Figure 3 shown cell group 100, the negative pole at the left end of the upper cell layer 10 and the positive pole at the left end of the lower cell layer 10 are respectively used as the negative output terminal and the positive output terminal of the cell group 100.

[0069] The negative output terminal and the positive output terminal of the cell group 100 can be electrically connected to the corresponding output terminals (positive output terminal or negative output terminal) of other cell groups 100 to enable electrical connection between different cell groups 100; or, the negative output terminal and the positive output terminal of the cell group 100 can also be electrically connected to electrical components.

[0070] Exemplarily, the respective output terminals of two different battery cell groups 100 can be electrically connected through electrical connection lines, conductive sheets or busbars.

[0071] In this embodiment, since two adjacent stacked battery cells 11 in the same battery cell layer 10 are electrically connected, any number of stacked battery cells 11 can be arranged in the width direction of the stacked battery cells 11 (such as the X direction in Figure 1 ) according to production requirements in the same battery cell layer 10. At the same time, any number of battery cell layers 10 can be stacked in the thickness direction of the stacked battery cells 11 (such as the Y direction in Figure 1 ), and different battery cell layers 10 (for example, adjacent battery cell layers 10) can be electrically connected through the inter-layer connecting battery cells 30 provided at the ends of the battery cell layers 10.

[0072] Such as Figure 1 , Figure 3 and Figure 7 , in some embodiments, the plurality of battery cells 20 further includes in-layer connecting battery cells 40. The in-layer connecting battery cells 40 are arranged in a staggered manner with the stacked battery cells 11, and the connecting ends 211 of the in-layer connecting battery cells 40 are arranged opposite to the connecting ends 211 of the stacked battery cells 11, so that the first pole columns 22 of the in-layer connecting battery cells 40 are directly electrically connected to the second pole columns 23 of one of the two adjacent stacked battery cells 11 in the same battery cell layer 10, and the second pole columns 23 of the in-layer connecting battery cells 40 are directly electrically connected to the first pole columns 22 of the other.

[0073] Such as Figure 1 , in the same battery cell layer 10, the polarities of the mutually approaching pole columns of two adjacent stacked battery cells 11 are opposite. Specifically, as Figure 5 , in the adjacent first stacked battery cell 11a and second stacked battery cell 11b, the B first pole column 22b of the second stacked battery cell 11b is close to the A second pole column 23a of the first stacked battery cell 11a. In order to realize the electrical connection of two adjacent stacked battery cells 11 in the same battery cell layer 10, in this embodiment, a first in-layer connecting battery cell 40d is provided between the first stacked battery cell 11a and the second stacked battery cell 11b. The first in-layer connecting battery cell 40d is arranged in a staggered manner with the first stacked battery cell 11a and the second stacked battery cell 11b. The D second pole column 23d of the first in-layer connecting battery cell 40d is directly electrically connected to the B first pole column 22b of the second stacked battery cell 11b, and the D first pole column 22d of the first in-layer connecting battery cell 40d is directly electrically connected to the A second pole column 23a of the first stacked battery cell 11a. At this time, the first stacked battery cell 11a and the second stacked battery cell 11b are connected in series through the first in-layer connecting battery cell 40d.

[0074] It should be noted that the connection method of the pole columns of the same-layer connected battery cells 40 and the pole columns of the stacked battery cells 11 is the same as the connection method of the pole columns of the inter-layer connected battery cells 30 and the pole columns of the stacked battery cells 11, and will not be elaborated here.

[0075] In addition to the above connection method, the battery cell group 100 can also achieve electrical connection between the stacked battery cells 11 of different battery cell layers 10 by only arranging a plurality of inter-layer connected battery cells 30 between different battery cell layers 10.

[0076] Such as Figure 9 shown, in some embodiments, each battery cell layer 10 includes at least two stacked battery cells 11; the stacked battery cells 11 in one of the adjacent two battery cell layers 10 are arranged in a staggered manner with the stacked battery cells 11 in the other; each stacked battery cell 11 is directly electrically connected to the corresponding stacked battery cell 11 in different battery cell layers 10 through an inter-layer connected battery cell 30.

[0077] For Figure 9 structural and directional further illustration. The fourth stacked battery cell 11e in the upper battery cell layer 10 and the fifth stacked battery cell 11f in the lower battery cell layer 10 are arranged in a staggered manner. Exemplarily, along the thickness direction of the stacked battery cell 11, the right pole column of the fourth stacked battery cell 11e and the left pole column of the fifth stacked battery cell 11f can be aligned. Similarly, the left pole column of the fourth stacked battery cell 11e and the right pole column of the sixth stacked battery cell 11h can be aligned. The fourth stacked battery cell 11e and the fifth stacked battery cell 11f can be directly electrically connected through the third inter-layer connected battery cell 30g, and the fourth stacked battery cell 11e and the sixth stacked battery cell 11h are directly electrically connected through the first inter-layer connected battery cell 30i.

[0078] Exemplarily, when the pole column of the stacked battery cell 11 located at the end (such as the right pole column of the fifth stacked battery cell 11f) is not connected to the inter-layer connected battery cell 30, this pole column can be used as the output terminal of the battery cell group 100; when the pole column of the stacked battery cell 11 located at the end is connected to the inter-layer connected battery cell 30, the pole column of the inter-layer connected battery cell 30 that is not connected to the stacked battery cell 11 can be used as the output terminal of the battery cell group 100.

[0079] Such as Figure 9 , in the battery cell group 100 of this embodiment, the current (such as Figure 9The arrow line in it) flows from the pole of the second inter-layer connecting battery cell 30j that is not connected to the stacked battery cell 11 through the second inter-layer connecting battery cell 30j to the fifth stacked battery cell 11f of the lower battery cell layer 10. After passing through the fifth stacked battery cell 11f, the current enters the third inter-layer connecting battery cell 30g, and after passing through the third inter-layer connecting battery cell 30g, it enters the fourth stacked battery cell 11e of the upper battery cell layer 10. After passing through the fourth stacked battery cell 11e of the upper battery cell layer 10, the current then enters the sixth stacked battery cell 11h of the lower battery cell layer 10 through the first inter-layer connecting battery cell 30i, and so on, and finally flows out of the battery cell group 100 through the leftmost inter-layer connecting battery cell 30.

[0080] In the related art, usually, tie straps are used to bind multiple existing battery cells together to achieve fixed connection. However, this connection method is not applicable to the case where multiple existing battery cells are arranged in a staggered manner.

[0081] In view of this, in some embodiments, adjacent battery cells 20 in the battery cell stack are fixedly connected.

[0082] Exemplarily, the adjacent battery cells 20 can be fixedly connected by means of adhesive connection or connection by a clamping member.

[0083] In order to enable the staggered battery cells 20 to also form a fixed whole, in this embodiment, an inter-fixing connection method between adjacent battery cells 20 is adopted. Compared with the overall bundling connection method of multiple existing battery cells, the connection method of this embodiment is more flexible, and the mutual fixed connection between the adjacent battery cells 20 can be achieved whether they are arranged in alignment or in a staggered manner.

[0084] In order to improve the energy density of the battery cell group 100 and also to facilitate the fixed connection of adjacent battery cells 20, the side walls of adjacent battery cells 20 can be made to fit together.

[0085] Such as Figure 2 , in some embodiments, the first pole 22 and the second pole 23 are distributed at intervals along the width direction of the battery cell main body 21, and the thickness direction of the battery cell main body 21 is perpendicular to the width direction of the battery cell main body 21; the thickness of the battery cell main body 21 is defined as H, the width of the battery cell main body 21 is defined as W, and the distance between the center points of the first pole 22 and the second pole 23 is defined as M, and W:H:M = 2:1:1.

[0086] In this embodiment, based on the above size ratio of the battery cell 20, such as Figure 1 and Figure 4 , when the first stacked battery cell 11a in the upper layer and the third stacked battery cell 11c in the lower layer are electrically connected through the inter-layer connecting battery cell 30, the first side wall 212 of the first stacked battery cell 11a and the first side wall 212 of the third stacked battery cell 11c just fit together. At the same time, such as Figure 5, when the first stacked battery cell 11a in the same layer and the adjacent second stacked battery cell 11b are electrically connected by the first in-layer connection battery cell 40d, the second side walls 213 of the first stacked battery cell 11a and the second stacked battery cell 11b just fit together. The first side wall 212 of the inter-layer connection battery cell 30 and the second side wall 213 of the adjacent first in-layer connection battery cell 40d just fit together. As Figure 7 , the first side walls 212 of the in-layer connection battery cells 40 in the upper layer and the first side walls 212 of the in-layer connection battery cells 40 in the lower layer can also just fit together.

[0087] As Figure 9 , when the stacked battery cells 11 in the upper layer and the stacked battery cells 11 in the lower layer are connected through multiple inter-layer connection battery cells 30, not only can the first side wall 212 of the fourth stacked battery cell 11e in the upper layer and the first side wall 212 of the fifth stacked battery cell 11f in the lower layer just fit together, but also the first side wall 212 of the second inter-layer connection battery cell 30j and the first side wall 212 of the adjacent third inter-layer connection battery cell 30g can just fit together.

[0088] Combining the above content, in this embodiment, by designing the width and thickness of the battery cell body 21 and the position between the first pole 22 and the second pole 23, the overall structure of the battery cell group 100 can be made more compact to improve the energy density of the battery cell group 100.

[0089] In some embodiments, an adhesive layer is provided between the side walls of adjacent battery cell bodies 21, and the adhesive layer is used to fixedly connect adjacent battery cells 20.

[0090] Exemplarily, the adhesive layer can be formed by a structural glue.

[0091] Exemplarily, the thickness of the adhesive layer can be 0.1 mm to 1 mm, for example: 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm or 1 mm.

[0092] Combining the foregoing content, since the side walls of adjacent battery cells 20 can just fit together, an adhesive layer can be formed between the two mutually fitting side walls, so that adjacent two battery cells 20 are bonded through the adhesive layer to fix the positions of adjacent two battery cells 20.

[0093] As Figure 8 , in some embodiments, a conductive adhesive layer 50 is provided between the first pole 22 and the corresponding second pole 23, and the conductive adhesive layer 50 is used to directly electrically connect the first pole 22 and the second pole 23.

[0094] Exemplarily, when the first pole 22 and the corresponding second pole 23 are in direct contact, the conductive adhesive layer 50 can be provided around the circumferences of the first pole 22 and the second pole 23.

[0095] Exemplarily, when there is a gap between the end face of the first pole 22 away from the connection end 211 and the end face of the second pole 23 away from the connection end 211, the conductive adhesive layer 50 is disposed therebetween.

[0096] Exemplarily, the thickness of the conductive adhesive layer 50 can be greater than 0 mm and less than 1 mm or equal to 1 mm. For example: 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.45 mm or 0.5 mm.

[0097] Exemplarily, the resistivity of the conductive adhesive is 1 to 100 times that of pure copper. For example: 10 times, 20 times, 30 times, 35 times or 60 times. The conductive adhesive has a certain elasticity, and its elongation at break can be 0 to 100%. For example: 10%, 20%, 25%, 30% or 50%; its compression rate can be 0 to 70%. For example: 10%, 20%, 25%, 30% or 50%.

[0098] The conductive adhesive layer 50 of this embodiment can be used to fix the relative positions between the first pole 22 and the corresponding second pole 23, preventing separation or misalignment between the two, so as to ensure reliable electrical connection between the two.

[0099] Such as Figure 2 and Figure 8 , in some embodiments, the connection end 211 of the battery cell 20 is provided with an overflow groove 2111 surrounding the first pole 22 and / or the second pole 23.

[0100] Exemplarily, the overflow groove 2111 can be a continuous annular groove structure; or, a discontinuous annular groove structure.

[0101] When the first pole 22 and the corresponding second pole 23 are bonded, the two will squeeze the conductive adhesive layer 50 and cause overflow of the adhesive. When the amount of overflow is too large, it is possible that the first pole 22 and the second pole 23 of the same battery cell 20 are electrically connected through the overflowed conductive adhesive, resulting in a short circuit.

[0102] In this embodiment, the overflow groove 2111 provided at the connection end 211 provides space for the overflowed conductive adhesive, allowing the overflowed conductive adhesive to flow into the overflow groove 2111, so as to ensure insulation between the first pole 22 and the second pole 23 of the same battery cell 20 and avoid short circuit.

[0103] Based on the same inventive concept, in combination with the description of the battery cell stack body in the above various embodiments, this embodiment provides a battery module, which has the corresponding technical effects of the battery cell stack body in the above various embodiments, and will not be elaborated here.

[0104] A battery module includes a battery cell stack body as described in the above various embodiments.

[0105] Based on the same inventive concept and in combination with the descriptions of the battery cell stacks in the above embodiments, this embodiment provides a battery pack, which has the corresponding technical effects of the battery cell stacks in the above embodiments and will not be elaborated herein.

[0106] A battery pack includes a battery cell stack as described in the above embodiments or a battery module of the above embodiments.

[0107] The applicant's research found that when the battery pack adopts the above battery cell stack, since the connection ends 211 of the stacked battery cells 11 and the connection ends 211 of the same-layer connecting battery cells 40 are arranged oppositely, the explosion-proof valves 24 provided at the connection ends 211 of the two are also arranged oppositely. At the same time, due to the relatively compact structure of the battery cell stack, when one of the battery cells 20 in the battery cell group 100 undergoes a thermal runaway, if the high-temperature and high-pressure substances (including gases and / or solids) ejected from its explosion-proof valve 24 are not guided, they will directly spray onto the oppositely arranged battery cell 20, which may cause the oppositely arranged battery cell 20 to also experience a thermal runaway and gradually spread, forming a thermal diffusion.

[0108] To reduce the occurrence of thermal diffusion in the battery stack, as Figure 10 , this embodiment provides a battery cell detection device 200, which includes a detection main body 210, inside which there is a smoke exhaust channel 2101 extending along a first direction (such as the X2 direction in Figure 10 ), and the end of the smoke exhaust channel 2101 penetrates through to the surface of the detection main body 210 to form a smoke exhaust port 2102; at least one side of the detection main body 210 is provided with a smoke suction port 2103, one end of the smoke suction port 2103 is communicated with the smoke exhaust channel 2101, and the other end is used to correspond to the explosion-proof valve 24 of the battery cell 20; an information acquisition component 220, which includes a plurality of acquisition parts 2201 arranged on the detection main body 210, the plurality of acquisition parts 2201 are at least arranged at intervals along the first direction, and the acquisition part 2201 is used to connect with the pole column of the battery cell 20 to acquire the temperature and / or voltage of the battery cell 20.

[0109] Exemplarily, each smoke exhaust channel 2101 is provided with an independent smoke exhaust port 2102; or at least two smoke exhaust channels 2101 are communicated with the same smoke exhaust port 2102.

[0110] Exemplarily, the smoke suction port 2103 and the acquisition part 2201 are arranged on the same side of the detection main body 210. For example, when there is an acquisition part 2201 on one side of the detection main body 210, the smoke suction port 2103 is also arranged on this side of the detection main body 210; when there are acquisition parts 2201 on both opposite sides of the detection main body 210, the smoke suction ports 2103 are also arranged on both opposite sides of the detection main body 210.

[0111] Exemplarily, the smoking port 2103 is disposed between at least two adjacent collection parts 2201.

[0112] Exemplarily, one end of the smoking port 2103 corresponding to the explosion-proof valve 24 of the battery cell 20 can cover the explosion-proof valve 24.

[0113] In this embodiment, after the first pole 22 and the second pole 23 of the battery cell 20 are connected to the collection part 2201, the position of the smoking port 2103 will correspond to the position of the explosion-proof valve 24 of the battery cell 20. As Figure 11 , when thermal runaway occurs in the battery cell 20, the high-temperature and high-pressure substances ejected from the explosion-proof valve 24 of the battery cell 20 (the flow direction is as shown by the arrow line in Figure 11 ) will enter the smoke exhaust channel 2101 through the smoking port 2103 and will finally be discharged through the smoke exhaust port 2102. Since the smoke exhaust channel 2101 is disposed inside the detection main body 210, the high-temperature and high-pressure substances will not cause great influence on other battery cells 20 during the flow in the smoke exhaust channel 2101.

[0114] Meanwhile, in order to monitor the battery cells 20 in the battery cell group 100 and prevent thermal runaway from occurring, in this embodiment, an information collection component 220 is provided. The first pole 22 and / or the second pole 23 of the battery cell 20 are connected to the collection part 2201 of the information collection component 220 to collect the temperature and / or voltage of the battery cell 20. An operator or a battery management module can determine the current state of the battery cell 20 based on the received temperature and / or voltage of the battery cell 20 to prevent thermal runaway of the battery cell 20.

[0115] For the battery cell detection device 200 provided in the embodiment of the present application, when thermal runaway occurs in the battery cell 20, the high-temperature and high-pressure substances ejected from the explosion-proof valve 24 can be collected through the smoking port 2103 corresponding to the explosion-proof valve 24 of the battery cell 20, and the high-temperature and high-pressure substances can be diverted through the smoke exhaust channel 2101 communicated with the smoking port 2103 and finally be discharged through the smoke exhaust port 2102, so as to avoid adverse effects of the high-temperature and high-pressure substances on other battery cells 20. Meanwhile, after the collection part 2201 is connected to the pole of the battery cell 20, the temperature and / or voltage of the battery cell 20 can be collected, which helps to monitor the state of the battery cell 20 and prevent thermal runaway of the battery cell 20.

[0116] As Figure 12 , Figure 13 , and Figure 15 , in some embodiments, the detection main body 210 is provided with a plurality of in the thickness direction (such as Figure 13A receiving through-hole 2104 penetrating in the Z2 direction (in the Z2 direction in the figure) is used to receive at least a part of the pole columns of the battery cells 20; the acquisition part 2201 includes a voltage acquisition sheet 22011 disposed in the receiving through-hole 2104, and opposite two surfaces of the voltage acquisition sheet 22011 in the thickness direction are respectively used for electrically connecting with the pole columns of different battery cells 20.

[0117] Exemplarily, the voltage acquisition sheet 22011 can be a pure copper metal sheet, a pure aluminum metal sheet, a pure nickel metal sheet, a copper-plated nickel metal sheet or an aluminum-plated nickel metal sheet.

[0118] When the battery cell detection device 200 is connected to the battery cell 20, Figure 15 , the first pole column 22 of one of the battery cells 20 can be inserted into the receiving through-hole 2104 through the left opening of the receiving through-hole 2104 and connected to one surface of the voltage acquisition sheet 22011, and the second pole column 23 of the other battery cell 20 can be inserted into the receiving through-hole 2104 through the right opening of the receiving through-hole 2104 and connected to the other surface of the voltage acquisition sheet 22011. At this time, the voltages of the two battery cells 20 can be acquired through the voltage acquisition sheet 22011, and at the same time, the pole columns of the two battery cells 20 can also be electrically connected through the voltage acquisition sheet 22011.

[0119] Such as Figure 12 and Figure 15 , in some embodiments, the voltage acquisition sheet 22011 is provided with a through connection through-hole 22011-3 in the thickness direction, and the pole columns of different battery cells 20 located on opposite sides of the voltage acquisition sheet 22011 are directly electrically connected through the connection through-hole 22011-3.

[0120] Exemplarily, a protruding raised structure can be provided on the end surface of the pole column of the battery cell 20, and the raised structures on the pole columns of different battery cells 20 located on opposite sides of the voltage acquisition sheet 22011 can extend into the connection through-hole 22011-3 and be directly in contact and connected.

[0121] Exemplarily, direct electrical connection can be achieved between the pole columns of different battery cells 20 located on opposite sides of the voltage acquisition sheet 22011 through a conductive adhesive passing through the connection through-hole 22011-3.

[0122] The direct connection of the pole columns of different battery cells 20 located on opposite sides of the voltage acquisition sheet 22011 through the connection through-hole 22011-3 helps to reduce the impedance between different battery cells 20 that are electrically connected to each other and improve the electrical performance of the battery cell group 100.

[0123] Such as Figure 13 and Figure 14 , in some embodiments, the acquisition part 2201 includes a temperature sensor 22012, and the temperature sensor 22012 is insulated and thermally connected to the voltage acquisition sheet 22011.

[0124] Exemplarily, the temperature sensor 22012 can be a thermistor sensor (NTC).

[0125] Exemplarily, the sensing part of the temperature sensor 22012 can be in direct contact with the voltage acquisition chip 22011; alternatively, the sensing part of the temperature sensor 22012 can be thermally connected to the voltage acquisition chip 22011 through a heat-conducting medium (such as heat-conducting glue).

[0126] Since the voltage acquisition chip 22011 is in contact connection with the pole post of the battery cell 20, the temperature of the voltage acquisition chip 22011 can reflect the temperature of the battery cell 20. The temperature sensor 22012 is thermally connected to the voltage acquisition chip 22011, and the temperature information collected by it can reflect the temperature of the battery cell 20. At the same time, since the voltage acquisition chip 22011 is a conductor, in order to avoid short-circuit of the temperature sensor 22012, it is necessary to insulate between the temperature sensor 22012 and the voltage acquisition chip 22011.

[0127] Such as Figure 10 , in some embodiments, the information acquisition component 220 further includes an information output device 2203 and a circuit board 2202 disposed inside the detection main body 210, and the acquisition part 2201 is electrically connected to the information output device 2203 through the circuit board 2202.

[0128] Exemplarily, the circuit board 2202 can be a printed circuit board (PCB), a flexible printed circuit (FPC) or a flexible flat cable (FFC).

[0129] Exemplarily, the information output device 2203 can be a low-voltage connector.

[0130] Exemplarily, the information output device 2203 can be surface-mounted (SMT) or through-hole soldered (DIP) on the surface of the circuit board 2202 and connected to the internal circuit of the circuit board 2202.

[0131] Exemplarily, the information output device 2203 can extend out of the surface of the detection main body 210 to facilitate connection with other electrical components.

[0132] The voltage and temperature of the battery cell 20 collected by the acquisition part 2201 can be sent to other electrical components through the information output device 2203. Disposing the circuit board 2202 inside the detection main body 210 can, on the one hand, make the overall structure of the battery cell detection device 200 relatively compact, and on the other hand, can also protect the circuit board 2202 through the detection main body 210.

[0133] Such as Figure 10 、 Figure 12 And Figure 14, in some embodiments, the voltage acquisition sheet 22011 includes a first connection portion 22011-1 for connecting to the pole of the battery cell 20, and a second connection portion 22011-2 for connecting to the circuit board 2202; the circuit board 2202 is provided with a circuit board accommodation space 22021 for accommodating the temperature sensor 22012. Along the thickness direction of the circuit board 2202, the orthographic projection of the circuit board accommodation space 22021 on the voltage acquisition sheet 22011 coincides at least partially with the second connection portion 22011-2; the temperature sensor 22012 is positioned in the circuit board accommodation space 22021, electrically connected to the circuit board 2202 and thermally connected to the second connection portion 22011-2.

[0134] Exemplarily, such as Figure 14 , the circuit board accommodation space 22021 is a blind hole, and a main body avoidance hole 2105 corresponding to the circuit board accommodation space 22021 is provided on the detection main body 210.

[0135] Exemplarily, the temperature sensor 22012 can be encapsulated in the circuit board accommodation space 22021 by injection molding or pouring insulating glue.

[0136] Exemplarily, the temperature sensor 22012 can be mounted on the internal circuit layer of the circuit board 2202.

[0137] Exemplarily, when the orthographic projection of the circuit board accommodation space 22021 on the voltage acquisition sheet 22011 is located within the outer contour of the second connection portion 22011-2, the second connection portion 22011-2 can be provided with an acquisition sheet avoidance hole 22011-4 for accommodating the temperature sensor 22012.

[0138] Exemplarily, the number of the temperature sensors 22012 is not greater than the number of the voltage acquisition sheets 22011.

[0139] Exemplarily, the second connection portion 22011-2 can be mounted or welded to the internal circuit of the circuit board 2202 to achieve electrical connection between the voltage acquisition sheet 22011 and the circuit board 2202.

[0140] The first connection part 22011-1 is at least partially located within the accommodation through hole 2104 to achieve connection with the pole of the battery cell 20. The second connection part 22011-2 extends into the detection main body 210 and is connected to the circuit board 2202. To avoid adverse effects on the connection between the voltage acquisition piece 22011 and the pole of the battery cell 20, the temperature sensor 22012 is thermally connected to the second connection part 22011-2. At the same time, since the temperature sensor 22012 is disposed within the circuit board accommodation space 22021 on the circuit board 2202, on the one hand, the temperature sensor 22012 can be protected by the detection main body 210 and the circuit board 2202, and on the other hand, interference from the external ambient temperature to the temperature sensor 22012 can be avoided to a certain extent, which helps to improve the accuracy of the temperature of the battery cell 20 collected by the temperature sensor 22012.

[0141] As Figure 10 , in some embodiments, a plurality of acquisition parts 2201 are arranged in at least two rows along the second direction (such as Figure 10 the Y2 direction in

[0142] Exemplarily, the first direction and the second direction are perpendicular to each other.

[0143] To avoid adverse effects on the circuit board 2202 caused by high-temperature and high-pressure substances in the smoke exhaust channel 2101, the circuit board 2202 and the smoke exhaust channel 2101 are respectively arranged on opposite sides of the acquisition part 2201, so that a relatively large distance is maintained between the circuit board 2202 and the smoke exhaust channel 2101, which helps to reduce the heat transferred from the high-temperature and high-pressure substances in the smoke exhaust channel 2101 to the circuit board 2202.

[0144] As Figure 16 , Figure 17 and Figure 18 , in some embodiments, a plurality of acquisition parts 2201 are arranged in a single row along the first direction (such as Figure 16 the X2 direction in Figure 16 the Y2 direction in

[0145] It should be noted that Figure 16 are schematic diagrams of two battery cell detection devices 200 that are mirror images of each other. A plurality of acquisition parts 2201 arranged in a single row, a circuit board 2202 connected to the acquisition parts 2201, and an information output device 2203 are all provided on the detection main body 210 of each battery cell detection device 200. AsFigure 17 The exhaust gas flow channels 2101 of the two battery cell detection devices 200 are close to each other, and the exhaust gas outlets 2102 of the two battery cell detection devices 200 can be communicated with each other. As Figure 18 shown, the circuit boards 2202 of the two battery cell detection devices 200 are far away from each other.

[0146] In this embodiment, the flow direction of the high-temperature and high-pressure substance is as Figure 17 shown by the arrow dotted line in the figure. The high-temperature and high-pressure substances flow into their respective exhaust gas flow channels 2101 from the smoke intake ports 2103 of the two battery cell detection devices 200, converge at the exhaust gas outlets 2102, and are finally discharged.

[0147] As Figure 13 shown, Figure 14 and Figure 18 shown, in some embodiments, the detection main body 210 includes a structural board 2106. Along the thickness direction of the structural board 2106, heat protection layers 2107 are respectively connected to the opposite two side plates of the structural board 2106, and the exhaust gas flow channel 2101 is arranged between the two heat protection layers 2107.

[0148] Exemplarily, the structural board 2106 can be an engineering plastic (for example: polyamide PA, polypropylene PP or plastic alloy PC + ABS) board or a rubber (for example: silicone rubber) board.

[0149] Exemplarily, the heat protection layer 2107 can be a heat insulation material layer, for example: mica paper, whose performance is that it can withstand temperatures above 1000 °C, withstand voltages above 10 kV / mm, has a thickness of 0.08 mm to 0.5 mm, is soft in texture, does not break when folded 180°, does not break under a pressure of 0.5 MPa or less, and must break under a pressure of 0.6 MPa or more.

[0150] The structural board 2106 is not provided at the positions corresponding to the exhaust gas flow channel 2101 and the smoke intake port 2103, so as to provide a flow space for the high-temperature and high-pressure substances, so as to form the exhaust gas flow channel 2101 and the smoke intake port 2103 communicated with the exhaust gas flow channel 2101.

[0151] Based on the same inventive concept, in combination with the description of the battery cell detection device 200 in the above various embodiments, this embodiment provides a battery pack, and this battery pack has the corresponding technical effects of the battery cell detection device 200 in the above various embodiments, which will not be elaborated here.

[0152] As Figure 19 shown, a battery pack includes a plurality of battery cells 20 and the battery cell detection device 200 in the above various embodiments; the plurality of battery cells 20 are electrically connected to each other.

[0153] Exemplarily, one side surface of the voltage acquisition sheet 22011 of the battery cell detection device 200 that is not connected to the pole column of the battery cell 20 may be connected to the output connection sheet 400, and through the output connection sheet 400, it can be connected to other electrical components; alternatively, the battery cell detection device 200 can also be electrically connected to other battery cell detection devices 200 through the output connection sheet 400, so as to achieve electrical connection between the battery cells 20 respectively connected to two different battery cell detection devices 200.

[0154] For example Figure 19 and Figure 20 , in some embodiments, the battery pack includes at least one battery cell group 100, each battery cell group 100 includes at least two battery cell layers 10 arranged in a stacked manner, and each battery cell layer 10 includes at least two battery cells 20 arranged along a first direction (such as Figure 19 the X3 direction in

[0155] ); each battery cell detection device 200 is connected to at least one battery cell 20 of one battery cell layer 10; between two different battery cell groups 100, they are electrically connected through an electrical connection member, and the electrical connection member is electrically connected to the pole column of the battery cell 20 and / or the acquisition part 2201 of the battery cell detection device 200.

[0156] Exemplarily, the electrical connection member can be an electrical connection line, a conductive sheet or a conductive row.

[0157] When using the pole column of the battery cell 20 as the output end of the battery cell group 100, the electrical connection member is electrically connected to the pole column of the battery cell 20. When using the acquisition part 2201 connected to the pole column of the battery cell 20 as the output end of the battery cell group 100, the electrical connection member is electrically connected to the acquisition part 2201.

[0158] Before different battery cell groups 100, series connection or parallel connection can be achieved through the electrical connection member, so that multiple battery cells 20 in the battery pack are electrically connected to each other. Figure 19 When the battery cell detection device 200 is simultaneously connected to two battery cell layers 10, such as

[0159] Figure 20 Figure 21 and , the connection manner of the battery cells 20 of the two battery cell layers 10 to each other can be the same as the connection manner of the battery cell stack in each of the above embodiments, and will not be elaborated here.

[0160] Figure 21 For example Figure 21, in some embodiments, the battery cell detection device 200 corresponds to the battery cell layer 10 one by one; the battery pack further includes a liquid cooling assembly 500, the liquid cooling assembly 500 includes a transverse liquid cooling plate 510 disposed between adjacent battery cell layers 10, and a longitudinal liquid cooling plate 520 disposed on the side of the battery cell 20 away from the battery cell detection device 200, and the internal flow channels of the transverse liquid cooling plate 510 and the longitudinal liquid cooling plate 520 are communicated.

[0161] Exemplarily, each transverse liquid cooling plate 510 is connected to two longitudinal liquid cooling plates 520, and the two longitudinal liquid cooling plates 520 are located on opposite sides of the battery cell detection device 200. The two longitudinal liquid cooling plates 520 and the transverse liquid cooling plate 510 form an H-shaped structure.

[0162] Exemplarily, the first side wall 212 of the battery cell 20 is adhesively fixed to the plate surface of the transverse liquid cooling plate 510.

[0163] Exemplarily, the bottom end 214 of the battery cell 20 is adhesively fixed to the plate surface of the longitudinal liquid cooling plate 520.

[0164] Since each battery cell layer 10 is connected to an independent battery cell detection device 200, two adjacent battery cell layers 10 can be spaced apart from each other. In order to improve the cooling efficiency of the battery cell group 100, a transverse liquid cooling plate 510 is disposed between two adjacent battery cell layers 10, and the transverse liquid cooling plate 510 is attached to the first side walls 212 of the respective battery cells 20 in the battery cell layer 10 to achieve heat exchange with each battery cell 20. At the same time, the longitudinal liquid cooling plate 520 can be attached to the bottom ends 214 of the respective battery cells 20 to cooperate with the transverse liquid cooling plate 510 to exchange heat with each battery cell 20.

[0165] In addition to being connected to other electrical components through the output connection piece 400, the battery cell detection device 200 is such as Figure 20 , Figure 21 , Figure 22 and Figure 23 , in some embodiments, the battery pack further includes an external connection component 300, the external connection component 300 includes: an insulating seat body 310, a flue gas exhaust flow channel 311 is arranged in the insulating seat body 310, one end of the flue gas exhaust flow channel 311 is communicated with the smoke exhaust port 2102, and the other end is used for communicating with the outside; a connecting piece 320, the middle of the connecting piece 320 is embedded in the insulating seat body 310, both ends of the connecting piece 320 extend out of the insulating seat body 310 respectively, one end of the connecting piece 320 is electrically connected to the collecting part 2201 and / or the pole column of the battery cell 20, and the other end is provided with a connecting structure 321 for connecting with an electrical component.

[0166] Exemplarily, the insulating seat body 310 can be an engineering plastic structural part or a rubber structural part.

[0167] Exemplarily, the connecting member 320 can be a conductive material member, such as a pure copper metal structure member or a pure aluminum metal structure member.

[0168] Exemplarily, the height by which the connecting member 320 protrudes from the insulating base 310 can be 0.1 mm to 0.5 mm (for example, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.45 mm).

[0169] Exemplarily, the connecting structure 321 can be a threaded hole, and the specification of the threaded hole can be M5 to M10 (for example, M5, M6, M8, or M10).

[0170] Exemplarily, the insulating base 310 includes two surfaces at a preset angle (such as perpendicular), and the two ends of the flue gas exhaust channel 311 are respectively located on the two surfaces.

[0171] Exemplarily, the insulating base 310 is further provided with a base avoidance groove 330 corresponding to the information output device 2203. When the external component 300 and the battery cell detection device 200 are connected, the information output device 2203 can be located in the base avoidance groove 330 to avoid interference between the information output device 2203 and the insulating base 310.

[0172] Exemplarily, the insulating base 310 is further provided with an external connection avoidance through hole 340 corresponding to the connecting member 320, and the electrical component can pass through the insulating base 310 through the external connection avoidance through hole 340 to facilitate connection with the connecting structure 321.

[0173] Exemplarily, the connecting member 320 can be electrically connected to the pole post of the battery cell 20 and / or the voltage acquisition sheet 22011 through a conductive adhesive.

[0174] Exemplarily, at least two connecting members 320 are provided on each insulating base 310, and the at least two connecting members 320 are respectively arranged on opposite sides of the flue gas exhaust channel 311.

[0175] Exemplarily, the horizontal liquid cooling plate 510 is provided with an avoidance structure corresponding to the insulating base 310, so that the external component 300 having two connecting members 320 can straddle the horizontal liquid cooling plate 510 and be connected to two battery cell layers 10 at the same time.

[0176] Through the flue gas exhaust channel 311 of the insulating base 310, the high-temperature and high-pressure substances discharged from the smoke exhaust port 2102 can be further guided, which helps to realize guiding the high-temperature and high-pressure substances outside the battery pack. Through the connecting structure 321, the electrical component can be reliably connected to the connecting member 320, and then the reliable connection between the electrical component and the battery cell group 100 can be realized.

[0177] To enable the battery cells 20 in the battery cell group 100 to operate normally within a preset temperature range, an existing liquid cooling plate that is in direct or indirect heat-conducting contact with the battery cells 20 is usually provided in the battery pack. The fluid medium (such as air or water, etc.) flowing in the existing liquid cooling plate can exchange heat with the battery cells 20 to control the temperature of the battery cells 20.

[0178] However, the applicant has found that in the related art, the fluid medium in the existing liquid cooling plate usually only flows from one side to the other side in one direction. Since the fluid medium continuously exchanges heat with the battery cells 20 during the flow process (that is, the fluid medium continuously absorbs heat or radiates heat outward), the temperature difference between the liquid inlet side and the liquid outlet side of the existing liquid cooling plate is relatively large. Correspondingly, the heat exchange effects of the existing liquid cooling plate on the battery cells 20 located in different regions also vary greatly, and it is difficult to ensure that all the battery cells 20 in the battery pack are maintained within the preset temperature range.

[0179] In view of this, as Figure 24 、 Figure 25 and Figure 26 , this embodiment provides a liquid cooling plate 600, which includes an upper cooling plate 610, a flow channel plate 620, and a lower cooling plate 630 that are sequentially stacked; an upper heat exchange flow channel 640 is defined between the flow channel plate 620 and the upper cooling plate 610, and a lower heat exchange flow channel 650 is defined between the flow channel plate 620 and the lower cooling plate 630; the upper cooling plate 610 has a heat exchange area 660, the orthographic projection of the upper heat exchange flow channel 640 on the upper cooling plate 610 is distributed within the heat exchange area 660, and the orthographic projection of the lower heat exchange flow channel 650 on the upper cooling plate 610 is distributed within the heat exchange area 660; the upper cooling plate 610 or the lower cooling plate 630 is provided with a first liquid inlet port 611, a second liquid inlet port 613, a first liquid outlet port 612, and a second liquid outlet port 614; the first liquid inlet port 611 and the first liquid outlet port 612 are respectively communicated with the upper heat exchange flow channel 640, and the second liquid inlet port 613 and the second liquid outlet port 614 are respectively communicated with the lower heat exchange flow channel 650; the upper heat exchange flow channel 640 and the lower heat exchange flow channel 650 are independent of each other, and the flow direction of the medium in the upper heat exchange flow channel 640 is opposite to the flow direction of the medium in the lower heat exchange flow channel 650.

[0180] Exemplarily, the upper cooling plate 610, the flow channel plate 620, and the lower cooling plate 630 can be connected by a stamping and brazing process to form the liquid cooling plate 600.

[0181] Exemplarily, the upper cooling plate 610, the flow channel plate 620, and the lower cooling plate 630 can all be aluminum alloy plates formed by stamping, such as 3-series aluminum alloy plates or 5-series aluminum alloy plates.

[0182] Exemplarily, grooves may be provided on the surface of the upper cold plate 610 facing the flow channel plate 620 and / or on the surface of the flow channel plate 620 facing the upper cold plate 610. After the upper cold plate 610 and the flow channel plate 620 are joined together, these grooves may form the upper heat exchange flow channel 640. Similarly, grooves may be provided on the surface of the lower cold plate 630 facing the flow channel plate 620 and / or on the surface of the flow channel plate 620 facing the lower cold plate 630. After the lower cold plate 630 and the flow channel plate 620 are joined together, these grooves may form the lower heat exchange flow channel 650.

[0183] Exemplarily, the upper heat exchange flow channel 640 and the lower heat exchange flow channel 650 are uniformly distributed within the heat exchange area 660 respectively.

[0184] Such as Figure 24 , taking the case where the first liquid inlet port 611, the second liquid inlet port 613, the first liquid outlet port 612, and the second liquid outlet port 614 are all provided on the upper cold plate 610 and the liquid cooling plate 600 is used to cool the battery cell 20 as an example for illustration. Exemplarily, such as Figure 25 , since the upper heat exchange flow channel 640 and the lower heat exchange flow channel 650 are respectively provided on both sides of the flow channel plate 620, flow channel through-holes 621 corresponding to the second liquid inlet port 613 and the second liquid outlet port 614 may be provided on the flow channel plate 620, so that the coolant can pass through the flow channel through-holes 621 to penetrate the flow channel plate 620 and enter the lower heat exchange flow channel 650.

[0185] The coolant enters the upper heat exchange flow channel 640 through the first liquid inlet port 611 and flows out from the first liquid outlet port 612 after flowing through the upper heat exchange flow channel 640. At the same time, the coolant flows into the lower heat exchange flow channel 650 through the second liquid inlet port 613 and flows out from the second liquid outlet port 614 after flowing through the lower heat exchange flow channel 650.

[0186] Since both the upper heat exchange channel 640 and the lower heat exchange channel 650 are distributed in the heat exchange area 660, the coolant in the upper heat exchange channel 640 and the coolant in the lower heat exchange channel 650 can both perform heat exchange with the battery cells 20 disposed in the heat exchange area 660. At the same time, since the flow direction of the coolant in the upper heat exchange channel 640 is opposite to the flow direction of the coolant in the lower heat exchange channel 650, the temperature gradient direction of the coolant in the upper heat exchange channel 640 is also opposite to the temperature gradient direction of the coolant in the lower heat exchange channel 650. Exemplarily, if the coolant in the upper heat exchange channel 640 flows from the left side to the right side of the heat exchange area 660, then the temperature of the upper heat exchange channel 640 gradually increases from the left side to the right side; while the coolant in the lower heat exchange channel 650 flows from the right side to the left side of the heat exchange area 660, then the temperature of the lower heat exchange channel 650 gradually increases from the right side to the left side. In other words, on the left side of the heat exchange area 660, the temperature of the upper heat exchange channel 640 is lower but the temperature of the lower heat exchange channel 650 is higher; while on the right side of the heat exchange area 660, the temperature of the upper heat exchange channel 640 is higher but the temperature of the lower heat exchange channel 650 is lower. Therefore, it helps to make the overall temperature of the heat exchange area 660 of the liquid cooling plate 600 relatively uniform.

[0187] For the liquid cooling plate 600 provided in this embodiment, both the upper heat exchange channel 640 and the lower heat exchange channel 650 are distributed in the heat exchange area 660, and the flow directions of the flowing media in the two are opposite. Then, the part with a higher temperature of the upper heat exchange channel 640 corresponds to the part with a lower temperature of the lower heat exchange channel 650, and the part with a lower temperature of the upper heat exchange channel 640 corresponds to the part with a higher temperature of the lower heat exchange channel 650. Under the combined action of the upper heat exchange channel 640 and the lower heat exchange channel 650, the temperatures at various positions in the heat exchange area 660 tend to be the same, and the liquid cooling plate 600 has strong temperature uniformity. This helps to keep the battery cells 20 at different positions disposed in the heat exchange area 660 within a preset temperature range.

[0188] As Figure 26 , in some embodiments, along the plate surface direction of the liquid cooling plate 600, the upper heat exchange channel 640 and the lower heat exchange channel 650 are arranged in parallel.

[0189] In this embodiment, the upper heat exchange channel 640 and the lower heat exchange channel 650 are arranged in parallel, and the extension paths of the upper heat exchange channel 640 and the lower heat exchange channel 650 are similar, which can enable both of them to directly act on the upper cold plate 610 and / or the lower cold plate 630, and have a higher heat exchange efficiency for the upper cold plate 610 and / or the lower cold plate 630, helping to ensure that the temperatures at different positions in the heat exchange area 660 of the liquid cooling plate 600 tend to be the same.

[0190] As Figure 26 and Figure 27, in some embodiments, the lower heat exchange channel 650 includes a first sub-lower heat exchange channel 651 and a second sub-lower heat exchange channel 652; along the width direction of the upper heat exchange channel 640, the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652 are respectively located on opposite sides of the upper heat exchange channel 640.

[0191] Exemplarily, such as Figure 26 , the upper heat exchange channel 640 is arranged in a serpentine shape, and isolation ribs 622 can be provided between two adjacent mutually parallel channel segments to define the first sub-lower heat exchange channel 651 or the second sub-lower heat exchange channel 652 between the isolation ribs 622 and the upper heat exchange channel 640.

[0192] Dividing the lower heat exchange channel 650 into the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652 provided on both sides of the upper heat exchange channel 640 can, on the one hand, make the distribution of the upper heat exchange channel 640 and the lower heat exchange channel 650 in the heat exchange area 660 more uniform, which helps to ensure that the temperatures at different positions in the heat exchange area 660 of the liquid cooling plate 600 tend to be the same; on the other hand, it can also improve the space utilization rate of the heat exchange area 660, which helps to improve the overall heat exchange capacity of the liquid cooling plate 600.

[0193] Such as Figure 28 、 Figure 29 and Figure 30 , in some embodiments, the width of the upper heat exchange channel 640 is greater than either of the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652.

[0194] Exemplarily, the plate thicknesses of the upper cold plate 610, the lower cold plate 630, and the flow channel plate 620 can be 1 mm to 2.5 mm, for example, 1 mm, 1.5 mm, 2 mm, 2.2 mm, or 2.5 mm.

[0195] Exemplarily, such as Figure 30 , the height of the upper heat exchange channel 640 is the same as the height of the lower heat exchange channel 650, and the height T can be 3 mm to 7 mm, for example, 3 mm, 4 mm, 5 mm, 6 mm, or 7 mm.

[0196] Exemplarily, such as Figure 30 , the width P1 of the upper heat exchange channel 640 can be 10 mm to 30 mm, for example, 10 mm, 15 mm, 20 mm, 25 mm, or 30 mm.

[0197] Exemplarily, the width of the first sub-lower heat exchange channel 651 can be the same as the width of the second sub-lower heat exchange channel 652, and the width P2 can be 5 mm to 15 mm, for example, 5 mm, 7 mm, 10 mm, 12 mm, or 15 mm.

[0198] Exemplarily, the value of P2 is 1 / 2 of the value of P1.

[0199] Since the lower heat exchange runner 650 includes a first sub-lower heat exchange runner 651 and a second sub-lower heat exchange runner 652, if the width of the upper heat exchange runner 640 is small, the heat exchange capacity of the upper heat exchange runner 640 and that of the lower heat exchange runner 650 will be quite different. To avoid the above situation, the width of the upper heat exchange runner 640 is designed to be greater than either the first sub-lower heat exchange runner 651 or the second sub-lower heat exchange runner 652 to ensure the temperature uniformity effect of the liquid cooling plate 600.

[0200] Such as Figure 26 , in some embodiments, a liquid outlet extension runner 670 and / or a liquid inlet extension runner 680 are also defined between the runner plate 620 and the lower cold plate 630; one end of the liquid outlet extension runner 670 communicates with the lower heat exchange runner 650, and the other end extends to a position near the connection of the upper heat exchange runner 640 with the first liquid outlet port 612 and communicates with the second liquid outlet port 614 so that the first liquid outlet port 612 is close to the second liquid outlet port 614; one end of the liquid inlet extension runner 680 communicates with the lower heat exchange runner 650, and the other end extends to a position near the connection of the upper heat exchange runner 640 with the first liquid inlet port 611 and communicates with the second liquid inlet port 613 so that the first liquid inlet port 611 is close to the second liquid inlet port 613.

[0201] Exemplarily, a groove can be provided on the plate surface of the lower cold plate 630 facing the runner plate 620 to define the liquid outlet extension runner 670 and / or the liquid inlet extension runner 680 when the lower cold plate 630 and the runner plate 620 are fitted and connected.

[0202] The coolant in the lower heat exchange runner 650 can flow through the liquid outlet extension runner 670 to the second liquid outlet port 614 and flow out. Through the liquid outlet extension runner 670, the second liquid outlet port 614 can be arranged at a position close to the first liquid outlet port 612, facilitating the layout of the liquid outlet pipeline. Similarly, the coolant enters the liquid inlet extension runner 680 from the second liquid inlet port 613 and flows into the lower heat exchange runner 650. Through the liquid inlet extension runner 680, the second liquid inlet port 613 can be arranged at a position close to the first liquid inlet port 611, facilitating the layout of the liquid inlet pipeline.

[0203] Such as Figure 26 , in some embodiments, the liquid outlet extension runner 670 communicates with both the first sub-lower heat exchange runner 651 and the second sub-lower heat exchange runner 652 at the same time, and the liquid inlet extension runner 680 communicates with both the first sub-lower heat exchange runner 651 and the second sub-lower heat exchange runner 652 at the same time.

[0204] The coolant in the first sub-lower heat exchange runner 651 and the coolant in the second sub-lower heat exchange runner 652 converge in the liquid outlet extension runner 670 and the liquid inlet extension runner 680, which helps to reduce the number of layouts of the liquid inlet pipeline and the liquid outlet pipeline and simplifies the structure.

[0205] Based on the same inventive concept and in combination with the description of the liquid cooling plate 600 in each of the above embodiments, this embodiment provides a battery pack, which has the corresponding technical effects of the liquid cooling plate 600 in each of the above embodiments and will not be elaborated herein.

[0206] A battery pack includes a liquid cooling plate 600 as in each of the above embodiments.

[0207] Such as Figure 31 、 Figure 32 and Figure 33 , in some embodiments, the battery pack includes a box body 700, the box body 700 includes a bottom plate 710, a cover plate 720, and a circumferential frame 730 disposed between the bottom plate 710 and the cover plate 720. The bottom plate 710, the cover plate 720, and the circumferential frame 730 enclose a closed inner space 740 of the box body; the liquid cooling plate 600 is configured as the bottom plate 710 and / or the cover plate 720.

[0208] The inner space 740 of the box body can be used to accommodate the battery cells 20 or other electrical components. Exemplarily, the height of the circumferential frame 730 can be designed according to the number and arrangement of the battery cells 20 to be accommodated. The battery cells 20 can be adhesively fixed to the bottom plate 710 and / or at least a part of the cover plate 720. On the one hand, it ensures that the battery cells 20 can be stable in the inner space 740 of the box body, and on the other hand, it also helps to improve the heat exchange efficiency of the bottom plate 710 and / or the cover plate 720 configured by the liquid cooling plate 600 for the battery cells 20.

[0209] Such as Figure 31 、 Figure 32 and Figure 33 , in some embodiments, the battery pack includes a plurality of battery cells 20, and the circumferential frame 730 is connected with a partition beam 750. The partition beam 750 is used to divide the inner space 740 of the box body into a first sub-space 741 and a second sub-space 742. The first sub-space 741 is used to accommodate a plurality of battery cells 20; the cover plate 720 includes a first sub-cover plate 721 corresponding to the first sub-space 741 and a second sub-cover plate 722 corresponding to the second sub-space 742; the liquid cooling plate 600 is configured as the first sub-cover plate 721.

[0210] Exemplarily, the side of the partition beam 750 close to the cover plate 720 is flush with the side of the circumferential frame 730 close to the cover plate 720, and is provided with a fixing structure (such as a threaded hole, a blind rivet nut or a welding nut) for connecting the cover plate 720.

[0211] Exemplarily, the second sub-space 742 can be used to accommodate electrical components, such as high-voltage electrical components, etc.

[0212] Exemplarily, when the liquid cooling plate 600 is configured as the bottom plate 710, the heat exchange area 660 at least covers the orthographic projection of the first sub-space 741 on the surface of the bottom plate 710.

[0213] Under normal circumstances, the frequency of maintaining and operating the battery cells 20 is relatively low, while the frequency of maintaining and operating the electrical components (such as control components or transformer components, etc.) in the battery pack is relatively high. At the same time, the battery cells 20 have a relatively high demand for heat exchange performance, while the electrical components have a relatively low demand for heat exchange performance. Considering the above situations, in this embodiment, a partition beam 750 is provided in the internal space 740 of the box body, dividing the internal space 740 of the box body into a first sub-space 741 for accommodating the battery cells 20 and a second sub-space 742 for accommodating the electrical components. At the same time, the cover plate 720 is split into independent first sub-cover plate 721 and second sub-cover plate 722. When the first sub-cover plate 721 is connected to the circumferential frame 730, the first sub-space 741 can form an approximately enclosed space. Similarly, when the second sub-cover plate 722 is connected to the circumferential frame 730, the second sub-space 742 can form an approximately enclosed space. When the battery cells 20 do not need to be maintained or operated, regardless of whether the second sub-cover plate 722 is separated from the circumferential frame 730, the first sub-space 741 can maintain a relatively enclosed state, which can protect the battery cells 20 in the first sub-space 741 on the one hand and help maintain the temperature in the first sub-space 741 at a preset temperature on the other hand.

[0214] At the same time, the partition beam 750 can also serve as a reinforcing rib of the box body 700 to improve the overall strength of the box body 700.

[0215] Such as Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 and Figure 35 , in some embodiments, the battery pack further includes an inlet liquid manifold assembly 800 and an outlet liquid manifold assembly 900; the inlet liquid manifold assembly 800 includes an inlet liquid main pipe 810, inlet liquid branch pipes 820 that are in one-to-one correspondence and communication with the first inlet port 611 and the second inlet port 613, and an inlet liquid manifold body 830 disposed in the second sub-space 742; the inlet liquid branch pipes 820 are communicated with the inlet liquid main pipe 810 through the inlet liquid manifold body 830; the outlet liquid manifold assembly 900 includes an outlet liquid main pipe 910, outlet liquid branch pipes 920 that are in one-to-one correspondence and communication with the first outlet port 612 and the second outlet port 614, and an outlet liquid manifold body 930 disposed in the second sub-space 742; the outlet liquid branch pipes 920 are communicated with the outlet liquid main pipe 910 through the outlet liquid manifold body 930; the partition beam 750 is provided with a pipeline avoidance through hole 751 for the inlet liquid branch pipes 820 and the outlet liquid branch pipes 920 to pass through.

[0216] Exemplarily, both the liquid inlet manifold body 830 and the liquid outlet manifold body 930 can be multi-way (e.g., two-way, three-way or four-way) connectors.

[0217] Exemplarily, the liquid inlet branch pipe 820 connected to the cover plate 720 can be a flexible pipe.

[0218] Exemplarily, the liquid inlet branch pipe 820 can be communicated with the liquid inlet manifold body 830, the cover plate 720 (when the cover plate 720 is the liquid cooling plate 600 or an existing liquid cooling plate) or the bottom plate 710 (when the bottom plate 710 is the liquid cooling plate 600 or an existing liquid cooling plate) by means of a quick plug, welding or riveting. Similarly, the liquid outlet branch pipe 920 can be communicated with the liquid outlet manifold body 930, the cover plate 720 or the bottom plate 710 by means of a quick plug, welding or riveting.

[0219] Exemplarily, the pipeline avoidance through hole 751 can be a circular hole, a rectangular hole or a hole with an irregular shape.

[0220] Exemplarily, when the cover plate 720 or the bottom plate 710 does not adopt the liquid cooling plate 600 of the above embodiment, a liquid cooling plate made of aluminum alloy extrusion profile or a mouth organ liquid cooling pipe can also be adopted.

[0221] Exemplarily, the liquid inlet main pipe 810 and the liquid outlet main pipe 910 pass through the circumferential frame 730 and extend out of the box body 700.

[0222] The coolant flows into the liquid inlet manifold body 830 through the liquid inlet main pipe 810, is split in the liquid inlet manifold body 830, enters each liquid inlet branch pipe 820, and then enters the first sub-cover plate 721 composed of the liquid cooling plate 600 or an existing liquid cooling plate and the bottom plate 710 composed of the liquid cooling plate 600 or an existing liquid cooling plate respectively through the liquid inlet branch pipe 820. Similarly, the coolant flowing out of the first sub-cover plate 721 and the coolant flowing out of the bottom plate 710 will enter the liquid outlet manifold body 930 through the liquid outlet branch pipe 920 for confluence, and flow out of the box body 700 through the liquid outlet main pipe 910.

[0223] Since there is only one liquid inlet main pipe 810 and one liquid outlet main pipe 910 respectively, it is convenient to connect with the coolant pipelines outside the box body 700. At the same time, since the liquid inlet branch pipes 820 and the liquid outlet branch pipes 920 are all located in the internal space 740 of the box body 700, the box body 700 can be used to protect the liquid inlet branch pipes 820 and the liquid outlet branch pipes 920, and the appearance of the battery pack can also be made more concise.

[0224] Such as Figure 36 、 Figure 37 、 Figure 38 and Figure 39The multiple battery cells 20 placed in the first subspace 741 can form multiple battery cell groups 100 in the manner described in the above embodiment, each battery cell group 100 includes two battery cell layers 10, and a liquid cooling component 500 is arranged between the two battery cell layers 10. Take the liquid inlet confluence component 800 as an example for explanation. Figure 38 The bottom plate 710 is the liquid cooling plate 600 in the above embodiment, the first sub-cover plate 721 can be an existing liquid cooling plate, and a liquid cooling assembly 500 is arranged between the bottom plate 710 and the first sub-cover plate 721. Figure 39 The two liquid inlet branches 820 located below the liquid inlet confluence body 830 are used to communicate with the first liquid inlet port 611 and the second liquid inlet port 613 on the bottom plate 710 respectively, so as to inject coolant into the upper heat exchange channel 640 and the lower heat exchange channel 650 of the liquid cooling plate 600. The second liquid inlet branch 820b located above the liquid inlet confluence body 830 can pass through the partition beam 750 through the pipeline avoidance through hole 751, and communicate with the first sub-cover plate 721, so as to inject coolant into the existing liquid cooling plate. The first liquid inlet branch 820a can be connected to the liquid inlet of the liquid cooling component 500, so as to inject coolant into the liquid cooling component 500. Two adjacent liquid cooling components 500 can be connected through the liquid cooling pipeline 530, so that multiple liquid cooling components 500 form mutually connected flow channels.

[0225] It should be noted that the above describes some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the above embodiments and still achieve the desired results. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0226] The various embodiments in the present application are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0227] The description of the present application is given for the purpose of illustration and description, and is not intended to be exhaustive or to limit the present application to the disclosed form. Many modifications and variations are obvious to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present application, and to enable those of ordinary skill in the art to understand the present application and thus design various embodiments with various modifications suitable for specific purposes.

[0228] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application (including the claims) is limited to these examples; under the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0229] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description.

[0230] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the appended claims. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A liquid cooling plate, characterized in that, It includes an upper cold plate, a flow channel plate, and a lower cold plate that are stacked in sequence; an upper heat exchange flow channel is defined between the flow channel plate and the upper cold plate, and a lower heat exchange flow channel is defined between the flow channel plate and the lower cold plate; the upper cold plate has a heat exchange area, the orthographic projection of the upper heat exchange flow channel on the upper cold plate is distributed within the heat exchange area, and the orthographic projection of the lower heat exchange flow channel on the upper cold plate is distributed within the heat exchange area; The upper cold plate or the lower cold plate is provided with a first liquid inlet port, a second liquid inlet port, a first liquid outlet port, and a second liquid outlet port; the first liquid inlet port and the first liquid outlet port are respectively communicated with the upper heat exchange flow channel, and the second liquid inlet port and the second liquid outlet port are respectively communicated with the lower heat exchange flow channel; the upper heat exchange flow channel and the lower heat exchange flow channel are independent of each other, and the flow direction of the medium in the upper heat exchange flow channel is opposite to the flow direction of the medium in the lower heat exchange flow channel.

2. The liquid cooling plate according to claim 1, wherein Along the plate surface direction of the liquid cooling plate, the upper heat exchange flow channel and the lower heat exchange flow channel are arranged side by side.

3. The liquid cooling plate according to claim 2, wherein, The lower heat exchange flow channel includes a first sub-lower heat exchange flow channel and a second sub-lower heat exchange flow channel; along the width direction of the upper heat exchange flow channel, the first sub-lower heat exchange flow channel and the second sub-lower heat exchange flow channel are respectively located on opposite sides of the upper heat exchange flow channel.

4. The liquid cooling plate according to claim 3, characterized in that, The width of the upper heat exchange flow channel is greater than either of the first sub-lower heat exchange flow channel and the second sub-lower heat exchange flow channel.

5. The liquid cooling plate according to claim 1, wherein An outlet liquid extension flow channel and / or an inlet liquid extension flow channel is also defined between the flow channel plate and the lower cold plate; One end of the outlet liquid extension flow channel is communicated with the lower heat exchange flow channel, and the other end extends to a position close to the connection of the upper heat exchange flow channel with the first liquid outlet port and is communicated with the second liquid outlet port, so that the first liquid outlet port is close to the second liquid outlet port; One end of the inlet liquid extension flow channel is communicated with the lower heat exchange flow channel, and the other end extends to a position close to the connection of the upper heat exchange flow channel with the first liquid inlet port and is communicated with the second liquid inlet port, so that the first liquid inlet port is close to the second liquid inlet port.

6. The liquid cooling plate according to claim 5, wherein, The lower heat exchange flow channel includes a first sub-lower heat exchange flow channel and a second sub-lower heat exchange flow channel; the outlet liquid extension flow channel is simultaneously communicated with the first sub-lower heat exchange flow channel and the second sub-lower heat exchange flow channel, and the inlet liquid extension flow channel is simultaneously communicated with the first sub-lower heat exchange flow channel and the second sub-lower heat exchange flow channel.

7. A battery pack, characterized in that, It includes the liquid cooling plate according to any one of claims 1 to 6.

8. The battery pack according to claim 7, wherein The battery pack includes a box body, the box body includes a bottom plate, a cover plate, and a circumferential frame arranged between the bottom plate and the cover plate, and the bottom plate, the cover plate, and the circumferential frame enclose a closed inner space of the box body; The liquid cooling plate is configured as the bottom plate and / or the cover plate.

9. The battery pack according to claim 8, wherein The battery pack includes a plurality of battery cells, the circumferential frame is connected with a partition beam, and the partition beam is used to divide the inner space of the box body into a first sub-space and a second sub-space, and the first sub-space is used to accommodate the plurality of battery cells; The cover plate includes a first sub-cover plate corresponding to the first sub-space and a second sub-cover plate corresponding to the second sub-space; the liquid cooling plate is configured as the first sub-cover plate.

10. The battery pack according to claim 9, characterized in that, The battery pack further includes an inlet liquid confluence assembly and an outlet liquid confluence assembly; The liquid inlet manifold assembly includes a liquid inlet main pipe, liquid inlet branch pipes respectively and correspondingly communicated with the first liquid inlet port and the second liquid inlet port, and a liquid inlet manifold body arranged in the second subspace; the liquid inlet branch pipes are communicated with the liquid inlet main pipe through the liquid inlet manifold body; The liquid outlet manifold assembly includes a liquid outlet main pipe, liquid outlet branch pipes respectively and correspondingly communicated with the first liquid outlet port and the second liquid outlet port, and a liquid outlet manifold body arranged in the second subspace; the liquid outlet branch pipes are communicated with the liquid outlet main pipe through the liquid outlet manifold body; The partition beam is provided with a pipeline avoidance through hole for the liquid inlet branch pipes and the liquid outlet branch pipes to pass through.

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