Battery cell stacks, battery modules and battery packs

Abstract

The present application provides a battery cell stack, a battery module and a battery pack, wherein the battery cell stack includes at least one battery cell group, each battery cell group includes at least two battery cell layers stacked in layers; the battery cell stack includes a plurality of battery cells, the plurality of battery cells include stacked battery cells and interlayer connection battery cells used to form battery cell layers; the connection ends of the stacked battery cells are arranged opposite to the connection ends of the interlayer connection battery cells, so that the first pole of the interlayer connection battery cell is directly electrically connected to the second pole of the stacked battery cell of one of the two battery cell layers, and the second pole of the interlayer connection battery cell is directly electrically connected to the first pole of the stacked battery cell of the other one. The battery cell stack, battery module and battery pack provided by the present application realize the electrical connection between the two battery cell layers by directly electrically connecting the first pole of the battery cell to the second pole of the other battery cell, using the battery cell to replace the bus in the related art.

Description

Technical Field

[0001] The present application relates to the technical field of power batteries, and in particular to a battery cell stack, a battery module and a battery pack. Background Art

[0002] The driving range has always been a key indicator of electric vehicles, so how to improve the volume grouping efficiency of the power battery system of electric vehicles (that is, the volume ratio of the battery in the battery system) has become an urgent problem to be solved. Summary of the invention

[0003] In view of this, the purpose of the present application is to provide a battery cell stack, a battery module and a battery pack.

[0004] Based on the above-mentioned purpose, the first aspect of the present application provides a battery cell stack, including: at least one battery cell group, each of the battery cell groups including at least two battery cell layers stacked in layers; the battery cell stack including a plurality of battery cells, each battery cell including a battery cell body, the battery cell body including a connecting end, the connecting end being provided with a first pole and a second pole, the polarities of the first pole and the second pole being opposite; the plurality of battery cells including stacked battery cells for constituting the battery cell layers, and interlayer connected battery cells; the connecting ends of the stacked battery cells are arranged opposite to the connecting ends of the interlayer connected battery cells, so that the first pole of the interlayer connected battery cells is directly electrically connected to the second pole of the stacked battery cells of one of the two battery cell layers, and the second pole of the interlayer connected battery cells is directly electrically connected to the first pole of the stacked battery cells of the other of the two battery cell layers.

[0005] Based on the same inventive concept, the second aspect of the present application further provides a battery module, comprising the battery cell stack as described in the first aspect.

[0006] Based on the same inventive concept, the third aspect of the present application further provides a battery pack, comprising the battery cell stack as described in the first aspect, or the battery module as described in the second aspect.

[0007] As can be seen from the above, the battery stack, battery module and battery pack provided by the present application, by arranging an interlayer connecting battery cell between two battery cell layers, directly electrically connects the first pole of the interlayer connecting battery cell and the second pole of the stacked battery cell of one of the battery cell layers, and directly electrically connects the second pole of the interlayer connecting battery cell and the first pole of the stacked battery cell of another battery cell layer, so as to use the interlayer connecting battery cell as a conductive connector connecting the two battery cell layers. In other words, by directly electrically connecting the first pole of the battery cell and the second pole of the other battery cell, the battery cell is used to replace the bus in the related art to achieve the electrical connection between the two battery cell layers. Compared with the structure of connecting the existing battery cells with a bus bar, the battery stack of the present application has a battery volume grouping efficiency increased by at least 4%, a cost reduction of at least 5%, and a reduction of more than 25% in the number of parts. At the same time, the battery 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 the passenger car. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the present application or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0009] Figure 1 A three-dimensional schematic diagram of a battery cell group of a battery cell stack according to an embodiment of the present application;

[0010] Figure 2 A three-dimensional schematic diagram of a battery cell of a battery cell stack according to an embodiment of the present application;

[0011] Figure 3 A schematic diagram of a main view of a battery cell group of a battery cell stack according to an embodiment of the present application;

[0012] Figure 4 for Figure 3 Schematic diagram of the cutaway of section AA;

[0013] Figure 5 for Figure 3 Schematic diagram of the cutaway of the BB section;

[0014] Figure 6 for Figure 3 Schematic diagram of the cutaway of the CC section;

[0015] Figure 7 for Figure 3 Schematic diagram of the cutaway of the DD section;

[0016] Figure 8 for Figure 7The enlarged schematic diagram of part E in the middle;

[0017] Fig. 9 A three-dimensional schematic diagram of a battery cell group of another structure of a battery cell stack according to an embodiment of the present application;

[0018] Fig.10 A three-dimensional schematic diagram of a battery cell detection device of a first structure according to an embodiment of the present application;

[0019] Fig.11 A schematic diagram of smoke exhaust for a battery cell detection device of a first structure according to an embodiment of the present application;

[0020] Fig.12 This is a schematic diagram of a main view of a battery cell detection device of a first structure according to an embodiment of the present application;

[0021] Fig.13 for Fig.12 Schematic diagram of the cutaway of the FF section;

[0022] Fig.14 for Fig.13 A magnified schematic diagram of part G in the middle;

[0023] Fig.15 It is a cross-sectional schematic diagram of the connection between the battery cell detection device and the pole of the battery cell according to the embodiment of the present application;

[0024] Fig.16 A three-dimensional schematic diagram of a battery cell detection device of a second structure according to an embodiment of the present application;

[0025] Fig.17 A schematic diagram of smoke exhaust for a battery cell detection device of a second structure according to an embodiment of the present application;

[0026] Fig.18 An exploded schematic diagram of a battery cell detection device of a second structure according to an embodiment of the present application;

[0027] Fig.19 A three-dimensional schematic diagram of a battery cell group of a battery cell detection device using a first structure according to an embodiment of the present application;

[0028] Fig. 20 A three-dimensional schematic diagram of a battery cell group of a battery cell detection device adopting the second structure according to an embodiment of the present application;

[0029] Fig.21 An exploded schematic diagram of a battery cell group of a battery cell detection device using the second structure according to an embodiment of the present application;

[0030] Fig. 22 A three-dimensional schematic diagram of an external component of an embodiment of the present application from a viewing direction;

[0031] Fig.23A three-dimensional schematic diagram of another viewing direction of an external component of an embodiment of the present application;

[0032] Fig.24 An exploded schematic diagram of a liquid cooling plate according to an embodiment of the present application;

[0033] Fig.25 for Fig.24 The enlarged schematic diagram of the middle J part;

[0034] Fig.26 It is a top perspective schematic diagram of a liquid cooling plate according to an embodiment of the present application;

[0035] Fig. 27 for Fig.26 An enlarged schematic diagram of the L portion;

[0036] Fig.28 This is a schematic top view of a liquid cooling plate according to an embodiment of the present application;

[0037] Fig.29 for Fig.28 Schematic diagram of the cutaway of the MM section;

[0038] Fig.30 for Fig.29 An enlarged schematic diagram of the N portion;

[0039] Fig.31 A three-dimensional schematic diagram of a battery pack according to an embodiment of the present application;

[0040] Fig.32 for Fig.31 A magnified schematic diagram of the R portion;

[0041] Fig.33 An exploded schematic diagram of a battery pack according to an embodiment of the present application;

[0042] Fig.34 for Fig.33 A magnified schematic diagram of the S part;

[0043] Fig.35 This is a schematic top view of a battery pack of an embodiment of the present application with the cover plate removed;

[0044] Fig.36 An exploded schematic diagram of a battery pack containing multiple battery cell groups according to an embodiment of the present application;

[0045] Fig.37 An exploded schematic diagram of multiple battery cell groups according to an embodiment of the present application;

[0046] Fig.38 A three-dimensional schematic diagram of a cover plate, a bottom plate, and a liquid cooling assembly in a battery pack according to an embodiment of the present application;

[0047] Fig.39 for Fig.38 Enlarged schematic diagram of the middle Q part. DETAILED DESCRIPTION

[0048] In order to make the objectives, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

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

[0050] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

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

[0052] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second" and similar words used in the embodiments of the present application do not represent any order, quantity or importance, but are only used to distinguish different components. "Including" or "comprising" and similar words mean that the elements or objects appearing in front of the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0053] In the related art, a plurality of existing battery cells (or battery cells) are provided in an existing battery pack. In order to realize electrical connection between the plurality of existing battery cells, a bus is usually used to connect the plurality of existing battery cells. The bus usually needs to be laser welded with the pole of the existing battery cell to realize electrical connection between the existing battery cell and the bus. However, the applicant has found that the laser welding process parameters have limitations, the welding performance between different materials needs to be verified by design, and there is a risk of poor welding, which leads to severe heat generation and affects the overall performance of the existing battery pack. At the same time, the bus will also occupy part of the space in the existing battery pack, resulting in a decrease in the energy density in the existing battery pack.

[0054] If the busbar can be removed and the existing battery cells can be directly connected, it will not only eliminate the problem of overall performance degradation of the existing battery pack due to poor welding, but also improve the energy density of the existing battery pack and reduce the cost of the existing battery pack.

[0055] In view of this, if Figure 1 and Figure 2 As shown, the present embodiment provides a battery cell stack, comprising: at least one battery cell group 100, each battery cell group 100 comprising at least two battery cell layers 10 stacked in layers; the battery cell stack comprising a plurality of battery cells 20, each battery cell 20 comprising a battery cell body 21, the battery cell body 21 comprising a connecting end 211, the connecting end 211 being provided with a first pole 22 and a second pole 23, the polarities of the first pole 22 and the second pole 23 being opposite; the plurality of battery cells 20 comprising stacked battery cells 11 for constituting a battery cell layer 10, and interlayer connecting battery cells 30; the connecting end 211 of the stacked battery cell 11 is arranged opposite to the connecting end 211 of the interlayer connecting battery cell 30, so that the first pole 22 of the interlayer connecting battery cell 30 is directly electrically connected to the second pole 23 of the stacked battery cell 11 of one of the two battery cell layers 10, and the second pole 23 of the interlayer connecting battery cell 30 is directly electrically connected to the first pole 22 of the stacked battery cell 11 of the other of the two battery cell layers 10.

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

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

[0058] Illustratively, when the battery cell stack includes at least two battery cell groups 100 , the at least two battery cell groups 100 may be electrically connected to each other (eg, connected in series or in parallel).

[0059] like Figure 2 The battery cell body 21 includes a Figure 2 The two first side walls 212 are spaced apart along the width direction (eg, Figure 2 The surface area of ​​the first side wall 212 is greater than the surface area of ​​the second side wall 213. The two first side walls 212 and the two second side walls 213 are combined to form the circumferential side wall of the battery body 21. The battery body 21 also includes a circumferential side wall along its height direction (such as Figure 2The connecting end 211 and the bottom end 214 are arranged at intervals along the width direction of the battery body 21. The first pole 22 and the second pole 23 are arranged at the connecting end 211 at intervals along the width direction of the battery body 21. Exemplarily, the first pole 22 is the positive pole of the battery cell 20, and the second pole 23 is the negative pole of the battery cell 20; or the first pole 22 is the negative pole of the battery cell 20, and the second pole 23 is the positive pole of the battery cell 20. The connecting end 211 is also provided with an explosion-proof valve 24, which is located between the first pole 22 and the second pole 23.

[0060] like Figure 3 and Figure 4 In the present embodiment, in order to enable the stacked battery cells 11 of the two battery cell layers 10 to be electrically connected without the aid of a bus, an interlayer connecting battery cell 30 is arranged between the two battery cell layers 10, and the connecting end 211 of the interlayer connecting battery cell 30 and the connecting end 211 of the stacked battery cell 11 are arranged relative to each other, so that the ends of the poles (including the first pole 22 and the second pole 23) of the interlayer connecting battery cell 30 can be facing the ends of the poles of the stacked battery cell 11, so that the two can be in conductive contact, thereby achieving direct electrical connection.

[0061] by Figure 4 Taking the structure and direction shown in the figure as an example for further explanation, the first pole 22a of the first stacked cell 11a located 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 located 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 battery stack of the present embodiment, an interlayer connecting battery cell 30 is provided between two battery cell layers 10, and the first pole 22 of the interlayer connecting battery cell 30 is directly electrically connected to the second pole 23 of the stacked battery cell 11 of one of the battery cell layers 10, and the second pole 23 of the interlayer connecting battery cell 30 is directly electrically connected to the first pole 22 of the stacked battery cell 11 of another battery cell layer 10, so that the interlayer connecting battery cell 30 is used as a conductive connector connecting the two battery cell layers 10. In other words, by directly electrically connecting the first pole 22 of the battery cell 20 to the second pole 23 of another battery cell 20, the battery cell 20 is used to replace the bus in the related art to achieve the electrical connection between the two battery cell layers 10. Through actual comparison, the applicant found that the battery stack of the present embodiment has a battery volume grouping efficiency of at least 4%, a cost reduction of at least 5%, and a reduction of more than 25% compared with the structure of connecting the existing battery cells with a bus. At the same time, the battery stack of the present embodiment can reduce the height of the battery system by more than 10%, which helps to increase the space of the passenger compartment of the passenger car.

[0063] like Figure 1In the battery cell layer 10, the thickness direction of the stacked battery cells 11 is parallel to the vertical direction. When the same battery cell layer 10 includes multiple stacked battery cells 11, the multiple stacked battery cells 11 are distributed along its width direction, and the connection ends 211 of the multiple stacked battery cells 11 are located on the same side, and the second side walls 213 of two adjacent stacked battery cells 11 are close to each other.

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

[0065] like Figure 1 In some embodiments, in the same battery layer 10 , at least two stacked battery cells 11 are included, and two adjacent stacked battery cells 11 are electrically connected; the interlayer connecting battery cell 30 is arranged at one end of the battery layer 10 .

[0066] For example, two adjacent stacked battery cells 11 in the same battery cell layer 10 may be electrically connected via a conductive metal sheet; or, they may be electrically connected via the battery cells 20 in a manner similar to the interlayer connection battery cells 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 of the output ends of the cell layer 10, and the second pole 23 at the other end can be used as the other output end of the cell layer 10. Figure 1 The direction in the figure is further explained. For example, the pole at the left end of the upper battery layer 10 (i.e., the exposed pole) is a negative pole, and the pole at the right end of the upper battery layer 10 (i.e., the pole connected to the interlayer connecting cell 30) is a positive pole. The pole at the left end of the lower battery layer 10 is a positive pole, and the pole at the right end of the lower battery layer 10 is a negative pole. The interlayer connecting cell 30 is located at the right end of the two battery layers 10, and the upper battery layer 10 and the lower battery layer 10 are connected in series through the interlayer connecting cell 30.

[0068] like Figure 3 and Figure 5 , in the upper core layer 10, the current (such as Figure 5 The arrow line in the figure flows from the negative electrode column of the stacked battery cell 11 at the left end to the positive electrode column of the stacked battery cell 11 at the right end and finally enters the interlayer connecting battery cell 30. Figure 3 and Figure 6 , the current passes through the interlayer connecting cell 30 and enters the lower cell layer 10 through the negative electrode column of the stacked cell 11 at the right end of the lower cell layer 10, and flows to the positive electrode column of the stacked cell 11 at the left end of the lower cell layer 10. Figure 3In the battery cell group 100 shown, the negative electrode column at the left end of the upper battery cell layer 10 and the positive electrode column at the left end of the lower battery cell layer 10 serve as the negative output terminal and the positive output terminal of the battery cell group 100 respectively.

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

[0070] Exemplarily, respective output ends of two different battery cell groups 100 may be electrically connected via electrical connection wires, conductive sheets or conductive bars.

[0071] In this embodiment, since two adjacent stacked battery cells 11 in the same battery cell layer 10 are electrically connected, the same battery cell layer 10 can be stacked along the width direction of the stacked battery cells 11 (such as Figure 1 At the same time, the stacked cells 11 can be stacked in any number along the thickness direction (such as the X direction) according to production needs. Figure 1 Any number of battery core layers 10 may be stacked (in the Y direction), and different battery core layers 10 (for example, adjacent battery core layers 10 ) may be electrically connected via interlayer connecting cells 30 disposed at ends of the battery core layers 10 .

[0072] like Figure 1 , Figure 3 and Figure 7 In some embodiments, the plurality of battery cells 20 further include same-layer connected battery cells 40, which are staggered with the stacked battery cells 11, and the connection ends 211 of the same-layer connected battery cells 40 are arranged relative to the connection ends 211 of the stacked battery cells 11, so that the first pole 22 of the same-layer connected battery cells 40 is directly electrically connected to the second pole 23 of one of the two adjacent stacked battery cells 11 in the same battery cell layer 10, and the second pole 23 of the same-layer connected battery cells 40 is directly electrically connected to the first pole 22 of the other one.

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

[0074] It should be noted that the connection method of the poles of the same-layer connected battery cells 40 and the poles of the stacked battery cells 11 is the same as the connection method of the poles of the interlayer connected battery cells 30 and the poles of the stacked battery cells 11, which will not be repeated here.

[0075] In addition to the above connection methods, the battery cell group 100 can also realize electrical connection between the stacked battery cells 11 of different battery cell layers 10 by only providing a plurality of interlayer connecting battery cells 30 between different battery cell layers 10 .

[0076] like Fig. 9 As shown, in some embodiments, each battery cell layer 10 includes at least two stacked battery cells 11; the stacked battery cells 11 of one of two adjacent battery cell layers 10 are staggered with the stacked battery cells 11 of the other one; and each stacked battery cell 11 is directly electrically connected to the corresponding stacked battery cells 11 in different battery cell layers 10 through an interlayer connecting cell 30.

[0077] by Fig. 9 The structure and direction are further explained. 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 staggered. Exemplarily, the right pole of the fourth stacked battery cell 11e and the left pole of the fifth stacked battery cell 11f can be aligned along the thickness direction of the stacked battery cell 11. Similarly, the left pole of the fourth stacked battery cell 11e and the right pole of the sixth stacked battery cell 11h are aligned. The fourth stacked battery cell 11e and the fifth stacked battery cell 11f can be directly electrically connected through the third interlayer connecting battery cell 30g, and the fourth stacked battery cell 11e and the sixth stacked battery cell 11h can be directly electrically connected through the first interlayer connecting battery cell 30i.

[0078] Exemplarily, when the pole of the stacked battery cell 11 located at the end (for example, the right pole of the fifth stacked battery cell 11f) is not connected to the interlayer connecting battery cell 30, the pole can serve as the output end of the battery cell group 100; when the pole of the stacked battery cell 11 located at the end is connected to the interlayer connecting battery cell 30, the pole of the interlayer connecting battery cell 30 that is not connected to the stacked battery cell 11 can serve as the output end of the battery cell group 100.

[0079] like Fig. 9 In the battery pack 100 of this embodiment, the current (such as Fig. 9 The current flows from the pole of the second interlayer connecting cell 30j that is not connected to the stacked cell 11 through the second interlayer connecting cell 30j to the fifth stacked cell 11f of the lower cell layer 10. The current enters the third interlayer connecting cell 30g after passing through the fifth stacked cell 11f, and enters the fourth stacked cell 11e of the upper cell layer 10 after passing through the third interlayer connecting cell 30g. After passing through the fourth stacked cell 11e of the upper cell layer 10, the current enters the sixth stacked cell 11h of the lower cell layer 10 through the first interlayer connecting cell 30i, and so on, and finally flows out of the cell group 100 through the interlayer connecting cell 30 at the far left.

[0080] In the related art, a cable tie is usually used to tie multiple existing battery cells together to achieve a fixed connection. However, this connection method is not applicable to the situation where multiple existing battery cells are staggered.

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

[0082] For example, adjacent battery cells 20 may be fixedly connected by adhesive connection or clamp connection.

[0083] In order to enable the staggered battery cells 20 to form a fixed whole, in this embodiment, a mutually fixed connection method is adopted between adjacent battery cells 20. Compared with the existing method of bundling multiple battery cells as a whole, the connection method of this embodiment is more flexible, and the mutually fixed connection between the adjacent battery cells 20 can be achieved regardless of whether they are aligned or staggered.

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

[0085] like Figure 2In some embodiments, the first pole 22 and the second pole 23 are spaced apart along the width direction of the battery cell body 21, and the thickness direction of the battery cell body 21 is perpendicular to the width direction of the battery cell body 21; the thickness of the battery cell body 21 is defined as H, the width of the battery cell body 21 is defined as W, the distance between the center point of the first pole 22 and the center point of the second pole 23 is defined as M, W:H:M=2:1:1.

[0086] In this embodiment, based on the above-mentioned size ratio of the battery cell 20, as shown in FIG. Figure 1 and Figure 4 When the upper first stacked battery cell 11a and the lower third stacked battery cell 11c are electrically connected through the interlayer 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 are just in contact with each other. Figure 5 When the first stacked battery cell 11a and the adjacent second stacked battery cell 11b in the same layer are electrically connected through the first same-layer connecting battery cell 40d, the second side wall 213 of the first stacked battery cell 11a and the second side wall 213 of the second stacked battery cell 11b just fit together. The first side wall 212 of the interlayer connecting battery cell 30 and the second side wall 213 of the adjacent first same-layer connecting battery cell 40d just fit together. Figure 7 The first side walls 212 of the upper connected battery cells 40 and the first side walls 212 of the lower connected battery cells 40 may also fit exactly.

[0087] like Fig. 9 When the stacked battery cells 11 on the upper layer and the stacked battery cells 11 on the lower layer are connected through multiple interlayer connecting battery cells 30, not only the first side wall 212 of the fourth stacked battery cell 11e on the upper layer and the first side wall 212 of the fifth stacked battery cell 11f on the lower layer can fit exactly together, but the first side wall 212 of the second interlayer connecting battery cell 30j and the first side wall 212 of the adjacent third interlayer connecting battery cell 30g can also fit exactly together.

[0088] In combination with the above, this embodiment designs the width and thickness of the battery cell body 21 and the position between the first pole 22 and the second pole 23 to make the overall structure of the battery cell group 100 more compact, thereby improving the energy density of the battery cell group 100.

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

[0090] Exemplarily, the adhesive layer may be formed of structural glue.

[0091] Exemplarily, the thickness of the adhesive layer may 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] In combination with the foregoing, since the side walls of adjacent battery cells 20 can fit exactly together, an adhesive layer can be formed between the two mutually fitting side walls so that the two adjacent battery cells 20 are bonded together through the adhesive layer so that the positions of the two adjacent battery cells 20 are fixed.

[0093] like 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 is in direct contact with the corresponding second pole 23 , the conductive adhesive layer 50 may be disposed around the circumference of the first pole 22 and the second pole 23 .

[0095] Exemplarily, when there is a gap between the end surface of the first pole 22 away from the connection end 211 and the end surface 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 may 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 position between the first pole 22 and the corresponding second pole 23 to avoid separation or misalignment between the two, so as to ensure reliable electrical connection between the two.

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

[0100] Exemplarily, the glue overflow groove 2111 may 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 together, the conductive adhesive layer 50 will be squeezed and glue overflows. When the amount of overflowed glue is too large, the first pole 22 and the second pole 23 of the same battery cell 20 may be electrically connected through the overflowed conductive glue, thereby causing a short circuit.

[0102] In this embodiment, the glue overflow groove 2111 arranged at the connection end 211 provides a space for overflowed conductive glue, so that the overflowed conductive glue can flow into the glue overflow groove 2111 to ensure that the first pole 22 and the second pole 23 of the same battery cell 20 are insulated from each other to avoid short circuit.

[0103] Based on the same inventive concept and in combination with the description of the battery cell stacks of the above embodiments, this embodiment provides a battery module having the corresponding technical effects of the battery cell stacks of the above embodiments, which will not be described in detail herein.

[0104] A battery module includes a battery cell stack according to the above embodiments.

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

[0106] A battery pack includes a battery cell stack according to the above embodiments, or a battery module according to the above embodiments.

[0107] The applicant has found that when the battery pack adopts the above-mentioned battery cell stack, since the connection end 211 of the stacked battery cell 11 and the connection end 211 of the same-layer connected battery cell 40 are arranged relative to each other, the explosion-proof valves 24 arranged at the connection ends 211 of the two are also arranged relative to each other. At the same time, since the structure of the battery cell stack is relatively compact, when one of the battery cells 20 of the battery cell group 100 has thermal runaway, the high-temperature and high-pressure substances (including gas and / or solid) ejected from its explosion-proof valve 24 will be directly sprayed toward the battery cell 20 arranged oppositely if not guided, which may cause the battery cell 20 arranged oppositely to also have thermal runaway, and gradually spread, forming heat diffusion.

[0108] In order to reduce the thermal diffusion of the battery stack, Fig.10 The embodiment provides a battery cell detection device 200, including a detection body 210, which is provided with a first direction (such as Fig.10A smoke exhaust channel 2101 extending in the detection body 210 (in the X2 direction), the end of the smoke exhaust channel 2101 passes through the surface of the detection body 210 to form a smoke exhaust port 2102; a smoke inhalation port 2103 is provided on at least one side of the detection body 210, one end of the smoke inhalation port 2103 is connected to 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 collection component 220 includes a plurality of collection parts 2201 arranged on the detection body 210, the plurality of collection parts 2201 are arranged at intervals along at least the first direction, and the collection part 2201 is used to be connected to the pole of the battery cell 20 to collect the temperature and / or voltage of the battery cell 20.

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

[0110] Exemplarily, the smoking port 2103 and the collecting portion 2201 are disposed on the same side of the detection body 210. For example, when the collecting portion 2201 is disposed on one side of the detection body 210, the smoking port 2103 is also disposed on the side of the detection body 210; when the collecting portions 2201 are disposed on both opposite sides of the detection body 210, the smoking ports 2103 are also disposed on the opposite sides of the detection body 210.

[0111] Exemplarily, the smoking port 2103 is disposed between at least part of two adjacent collecting portions 2201 .

[0112] Exemplarily, the 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 collecting portion 2201, the position of the smoking port 2103 will correspond to the position of the explosion-proof valve 24 of the battery cell 20. Fig.11 When the battery cell 20 experiences thermal runaway, the high-temperature and high-pressure material (flow direction is as follows) ejected from the explosion-proof valve 24 of the battery cell 20 Fig.11 2101) will enter the smoke exhaust channel 2101 through the smoke outlet 2103 and finally be discharged through the smoke outlet 2102. Since the smoke exhaust channel 2101 is arranged inside the detection body 210, the high temperature and high pressure material will not have a significant impact on other battery cells 20 when flowing in the smoke exhaust channel 2101.

[0114] At the same time, in order to monitor the battery cell 20 in the battery cell group 100 to prevent thermal runaway, 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 unit 2201 of the information collection component 220 to collect the temperature and / or voltage of the battery cell 20. The operator or the battery management module can determine the current state of the battery cell 20 through the received temperature and / or voltage of the battery cell 20 to prevent the battery cell 20 from thermal runaway.

[0115] The battery cell detection device 200 provided in the embodiment of the present application can collect the high-temperature and high-pressure substances ejected from the explosion-proof valve 24 through the smoke outlet 2103 corresponding to the explosion-proof valve 24 of the battery cell 20 when the battery cell 20 has thermal runaway, and guide the high-temperature and high-pressure substances through the smoke exhaust channel 2101 connected to the smoke outlet 2103, and finally discharge them through the smoke exhaust port 2102 to avoid the high-temperature and high-pressure substances from causing adverse effects on other battery cells 20. At the same time, after the collection unit 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 the battery cell 20 from having thermal runaway.

[0116] like Fig.12 , Fig.13 ,and Fig.15 In some embodiments, the detection body 210 is provided with a plurality of Fig.13 The receiving through hole 2104 is connected to the receiving through hole 2104 (in the Z2 direction), and the receiving through hole 2104 is used to receive at least part of the poles of the battery cell 20; the collecting portion 2201 includes a voltage collecting piece 22011 arranged in the receiving through hole 2104, and the opposite side surfaces of the voltage collecting piece 22011 along the thickness direction are respectively used to be electrically connected to the poles of different battery cells 20.

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

[0118] When the battery cell detection device 200 is connected to the battery cell 20, as shown in FIG. Fig.15 , the first pole 22 of one battery cell 20 can be inserted into the receiving through hole 2104 through the left opening of the receiving through hole 2104, and connected to one side surface of the voltage collection sheet 22011, and the second pole 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 side surface of the voltage collection sheet 22011. At this time, the voltage of the two battery cells 20 can be collected through the voltage collection sheet 22011, and the poles of the two battery cells 20 can also be electrically connected through the voltage collection sheet 22011.

[0119] like Fig.12 and Fig.15 In some embodiments, the voltage collection sheet 22011 is provided with a through connection hole 22011-3 along the thickness direction, and the poles of different battery cells 20 located on opposite sides of the voltage collection sheet 22011 are directly electrically connected through the connection hole 22011-3.

[0120] Exemplarily, a protruding protrusion structure may be provided on the end surface of the pole of the battery cell 20, and the protrusion structures on the poles of different battery cells 20 located on opposite sides of the voltage collection sheet 22011 may extend into the connecting through hole 22011-3 and be directly contacted and connected.

[0121] Exemplarily, the poles of different battery cells 20 located on opposite sides of the voltage collection sheet 22011 can be directly electrically connected by means of a conductive adhesive passing through the connecting through-holes 22011 - 3 .

[0122] The poles of different battery cells 20 located on opposite sides of the voltage collection sheet 22011 are directly connected through the connecting through holes 22011 - 3 , which helps to reduce the impedance between the different battery cells 20 electrically connected to each other and improve the electrical performance of the battery cell group 100 .

[0123] like Fig.13 and Fig.14 In some embodiments, the acquisition unit 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 may be a thermistor sensor (NTC).

[0125] Exemplarily, the sensing portion of the temperature sensor 22012 may be in direct contact with the voltage collection sheet 22011 ; or, the sensing portion of the temperature sensor 22012 may be thermally connected to the voltage collection sheet 22011 via a thermally conductive medium (eg, thermally conductive glue).

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

[0127] like Fig.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 body 210 , and the acquisition unit 2201 is electrically connected to the information output device 2203 through the circuit board 2202 .

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

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

[0130] Exemplarily, the information output device 2203 can be mounted on the circuit board 2202 by surface mount technology (SMT) or through solder connection technology (DIP), and connected to the internal circuit of the circuit board 2202 .

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

[0132] The voltage and temperature of the battery cell 20 collected by the collection unit 2201 can be sent to other electrical components through the information output device 2203. The circuit board 2202 is arranged inside the detection body 210. On the one hand, the overall structure of the battery cell detection device 200 can be made more compact, and on the other hand, the circuit board 2202 can be protected by the detection body 210.

[0133] like Fig.10 , Fig.12 and Fig.14 In some embodiments, the voltage collection 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 accommodating space 22021 for accommodating the temperature sensor 22012, and along the thickness direction of the circuit board 2202, the circuit board accommodating space 22021 is at least partially overlapped with the second connection portion 22011-2 in the orthographic projection of the voltage collection sheet 22011; the temperature sensor 22012 is positioned in the circuit board accommodating space 22021, is electrically connected to the circuit board 2202 and is thermally connected to the second connection portion 22011-2.

[0134] For example, Fig.14 The circuit board accommodating space 22021 is a blind hole, and the detection body 210 is provided with a main body avoidance hole 2105 corresponding to the circuit board accommodating space 22021.

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

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

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

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

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

[0140] The first connection portion 22011-1 is at least partially located in the accommodating through hole 2104 to achieve connection with the pole of the battery cell 20. The second connection portion 22011-2 extends into the interior of the detection body 210 and is connected to the circuit board 2202. In order to avoid adverse effects on the connection between the voltage collection sheet 22011 and the pole of the battery cell 20, the temperature sensor 22012 is thermally connected to the second connection portion 22011-2. At the same time, since the temperature sensor 22012 is arranged in the circuit board accommodating space 22021 on the circuit board 2202, on the one hand, the temperature sensor 22012 can be protected by the detection body 210 and the circuit board 2202, and on the other hand, it can also avoid interference of the external environment temperature on the temperature sensor 22012 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] like Fig.10 In some embodiments, the plurality of collecting parts 2201 are arranged along the second direction (eg Fig.10 The circuit board 2202 is located between two adjacent rows of collecting parts 2201, and the smoke exhaust channel 2101 is arranged along the second direction on a side of the collecting part 2201 away from the circuit board 2202; the second direction intersects with the first direction.

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

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

[0144] like Fig.16 , Fig.17 and Fig.18In some embodiments, the plurality of collecting parts 2201 are arranged along a first direction (eg Fig.16 In the X2 direction) they are arranged in a single row; along the second direction (such as Fig.16 In the Y2 direction, the circuit board 2202 and the smoke exhaust channel 2101 are respectively arranged on opposite sides of the collecting part 2201; the second direction intersects with the first direction.

[0145] It should be noted that Fig.16 Schematic diagrams of two battery cell detection devices 200 of this embodiment with mirror-image structures. The detection body 210 of each battery cell detection device 200 is provided with a plurality of collection parts 2201 arranged in a single row, a circuit board 2202 connected to the collection parts 2201, and an information output device 2203. Fig.17 , the smoke exhaust channels 2101 of the two battery cell detection devices 200 are close to each other, and the smoke exhaust ports 2102 of the two battery cell detection devices 200 can be connected to each other. Fig.18 , the circuit boards 2202 of the two battery cell detection devices 200 are away from each other.

[0146] In this embodiment, the flow direction of the high temperature and high pressure material is as follows: Fig.17 As shown by the dotted arrows in the figure, the high-temperature and high-pressure substances flow into the respective smoke exhaust channels 2101 from the smoke outlets 2103 of the two battery cell detection devices 200, converge at the smoke exhaust outlet 2102, and are finally discharged.

[0147] like Fig.13 , Fig.14 and Fig.18 In some embodiments, the detection body 210 includes a structural plate 2106 , and along the thickness direction of the structural plate 2106 , the opposite side surfaces of the structural plate 2106 are respectively connected with heat protection layers 2107 , and the smoke exhaust duct 2101 is arranged between the two heat protection layers 2107 .

[0148] Exemplarily, the structural plate 2106 may be an engineering plastic (eg, polyamide PA, polypropylene PP, or plastic alloy PC+ABS) plate or a rubber (eg, silicone rubber) plate.

[0149] Exemplarily, the thermal protection layer 2107 can be a thermal insulation material layer, such as mica paper, which has the properties of temperature resistance above 1000°C, voltage resistance above 10kV / mm, thickness of 0.08mm~0.5mm, soft texture, no breakage when folded at 180°, no rupture under pressure below 0.5MPa, and must rupture under pressure above 0.6MPa.

[0150] The positions corresponding to the smoke exhaust channel 2101 and the smoking port 2103 are not provided with the structural plate 2106 , so as to provide a flow space for the high-temperature and high-pressure substances to form the smoke exhaust channel 2101 and the smoking port 2103 connected to the smoke exhaust channel 2101 .

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

[0152] like Fig.19 A battery pack includes a plurality of battery cells 20 and a battery cell detection device 200 as described in the above embodiments; the plurality of battery cells 20 are electrically connected to each other.

[0153] Exemplarily, the voltage collection sheet 22011 of the battery cell detection device 200 may be connected to the output connection sheet 400 on one side surface of the pole of the battery cell 20, and may be connected to other electrical components through the output connection sheet 400; alternatively, the battery cell detection device 200 may 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] like Fig.19 and Fig. 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 stacked, each battery cell layer 10 includes a first direction (such as Fig.19 At least two battery cells 20 are arranged in the X3 direction); each battery cell detection device 200 is connected to the battery cell 20 of at least one battery cell layer 10; two different battery cell groups 100 are electrically connected through an electrical connector, and the electrical connector is electrically connected to the pole of the battery cell 20 and / or the collection part 2201 of the battery cell detection device 200.

[0155] Exemplarily, the electrical connection member may be an electrical connection wire, a conductive sheet, or a conductive bar.

[0156] When the pole of the cell 20 is used as the output end of the cell group 100, the electrical connector is electrically connected to the pole of the cell 20. When the collection part 2201 connected to the pole of the cell 20 is used as the output end of the cell group 100, the electrical connector is electrically connected to the collection part 2201.

[0157] Different battery cell groups 100 may be connected in series or in parallel via electrical connectors, so that the multiple battery cells 20 in the battery pack are electrically connected to each other.

[0158] When the battery cell detection device 200 is connected to two battery cell layers 10 at the same time, Fig.19 The way in which the battery cells 20 of the two battery cell layers 10 are connected to each other may be the same as the way in which the battery cell stacks of the above-mentioned embodiments are connected to each other, and will not be described in detail herein.

[0159] When the battery cell detection device 200 is connected to only one battery cell layer 10, as shown in FIG. Fig. 20 and Fig.21 Each cell layer 10 in the cell group 100 is connected to a corresponding cell detection device 200, and the connection method of multiple cells 20 in the same cell layer 10 is the same as the connection method of the stacked cells 11 and the same-layer connected cells 40 mentioned above, which will not be repeated here.

[0160] like Fig.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 arranged between adjacent battery cell layers 10, and a longitudinal liquid cooling plate 520 arranged on the side of the battery cell 20 away from the battery cell detection device 200, and the internal flow channel of the transverse liquid cooling plate 510 is connected to the internal flow channel of the longitudinal liquid cooling plate 520.

[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 bonded and fixed to the plate surface of the transverse liquid cooling plate 510 .

[0163] Exemplarily, the bottom end 214 of the battery cell 20 is bonded and 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 arranged between two adjacent battery cell layers 10, and the transverse liquid cooling plate 510 is attached to the first side wall 212 of each battery cell 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 end 214 of each battery cell 20, and 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 via the output connecting piece 400, the battery cell detection device 200 can also be connected to other electrical components via the output connecting piece 400. Fig. 20 , Fig.21 , Fig. 22 and Fig.23In some embodiments, the battery pack further includes an external component 300, which includes: an insulating base body 310, a smoke exhaust channel 311 is provided in the insulating base body 310, one end of the smoke exhaust channel 311 is connected to the smoke exhaust port 2102, and the other end is used to communicate with the outside world; a connector 320, the middle part of the connector 320 is embedded in the insulating base body 310, and the two ends of the connector 320 extend out of the insulating base body 310 respectively, one end of the connector 320 is electrically connected to the collecting part 2201 and / or the pole of the battery cell 20, and the other end is provided with a connecting structure 321 for connecting to an electrical component.

[0166] Exemplarily, the insulating base body 310 may be an engineering plastic structural member or a rubber structural member.

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

[0168] Exemplarily, the height of the connector 320 extending out of the insulating base 310 may be 0.1 mm to 0.5 mm (eg, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.45 mm).

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

[0170] Exemplarily, the insulating base body 310 includes two surfaces at a preset angle (eg, vertical), and the openings at both ends of the smoke exhaust channel 311 are respectively located on the two surfaces.

[0171] Exemplarily, the insulating seat 310 is also provided with a seat 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 seat avoidance groove 330 to avoid interference between the information output device 2203 and the insulating seat 310.

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

[0173] Exemplarily, the connector 320 may be electrically connected to the pole of the battery cell 20 and / or the voltage collection sheet 22011 through a conductive adhesive.

[0174] Exemplarily, at least two connecting members 320 are disposed on each insulating base body 310 , and the at least two connecting members 320 are respectively disposed on two opposite sides of the smoke exhaust channel 311 .

[0175] Exemplarily, the transverse liquid cooling plate 510 is provided with a avoidance structure corresponding to the insulating base 310 , so that the external component 300 having two connectors 320 can cross the transverse liquid cooling plate 510 and connect to two battery core layers 10 at the same time.

[0176] The high-temperature and high-pressure substances discharged from the smoke outlet 2102 can be further guided through the smoke exhaust channel 311 of the insulating seat 310, which helps to guide the high-temperature and high-pressure substances to the outside of the battery pack. The electrical component can be reliably connected to the connector 320 through the connection structure 321, thereby realizing a reliable connection between the electrical component and the battery cell group 100.

[0177] In order to enable the battery cells 20 in the battery cell group 100 to work normally within a preset temperature range, an existing liquid cooling plate is usually provided in the battery pack to be in direct or indirect thermal contact with the battery cells 20. 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 in one direction from one side to the other side. Since the fluid medium will continuously exchange heat with the battery cell 20 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 large. Correspondingly, the heat exchange effect of the existing liquid cooling plate on the battery cells 20 located in different areas is also very different, and it is difficult to ensure that all the battery cells 20 in the battery pack are kept within the preset temperature range.

[0179] In view of this, if Fig.24 , Fig.25 and Fig.26 The present embodiment provides a liquid cooling plate 600, comprising an upper cooling plate 610, a flow channel plate 620 and a lower cooling plate 630 which are stacked in sequence; 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, and the orthographic projection of the upper heat exchange flow channel 640 on the upper cooling plate 610 is distributed in 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 in the heat exchange area 660; the upper cooling plate 610 is provided with a heat exchange zone 660, wherein the upper heat exchange flow channel 640 is provided with a heat exchange zone 660, wherein the upper heat exchange flow channel 650 is provided with a heat exchange zone 660; The plate 610 or the lower cold 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 connected to the upper heat exchange channel 640, and the second liquid inlet port 613 and the second liquid outlet port 614 are respectively connected to the lower heat exchange channel 650; the upper heat exchange channel 640 and the lower heat exchange channel 650 are independent of each other, and the medium flow direction in the upper heat exchange channel 640 is opposite to the medium flow direction in the lower heat exchange channel 650.

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

[0181] Exemplarily, the upper cold plate 610 , the flow channel plate 620 , and the lower cold plate 630 may all be stamped aluminum alloy plates, such as 3 series aluminum alloy plates or 5 series aluminum alloy plates.

[0182] Exemplarily, a groove may be provided on the surface of the upper cold plate 610 facing the flow channel plate 620 and / or a groove may be provided on the surface of the flow channel plate 620 facing the upper cold plate 610, and after the upper cold plate 610 and the flow channel plate 620 are fitted and connected, the groove may form the upper heat exchange flow channel 640. Similarly, a groove may be provided on the surface of the lower cold plate 630 facing the flow channel plate 620 and / or a groove may be provided on the surface of the flow channel plate 620 facing the lower cold plate 630, and after the lower cold plate 630 and the flow channel plate 620 are fitted and connected, the groove may form the lower heat exchange flow channel 650.

[0183] Exemplarily, the upper heat exchange channels 640 and the lower heat exchange channels 650 are evenly distributed in the heat exchange area 660 .

[0184] like Fig.24 , 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 disposed on the upper cold plate 610, and the battery cell 20 is cooled by the liquid cold plate 600 as an example. Fig.25 Since the upper heat exchange channel 640 and the lower heat exchange channel 650 are respectively arranged on both sides of the channel plate 620, a channel through hole 621 corresponding to the second liquid inlet port 613 and the second liquid outlet port 614 can be arranged on the channel plate 620, so that the coolant can pass through the channel through hole 621 through the channel plate 620 and enter the lower heat exchange channel 650.

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

[0186] Since the upper heat exchange channel 640 and the lower heat exchange channel 650 are both 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 on the battery cell 20 arranged 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 and the temperature gradient direction of the coolant in the lower heat exchange channel 650 are also opposite. Exemplarily, the coolant in the upper heat exchange channel 640 flows from the left side to the right side of the heat exchange area 660, and 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, and 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 zone 660, the temperature of the upper heat exchange channel 640 is lower but the temperature of the lower heat exchange channel 650 is higher; and on the right side of the heat exchange zone 660, the temperature of the upper heat exchange channel 640 is higher but the temperature of the lower heat exchange channel 650 is lower, thus helping to make the overall temperature of the heat exchange zone 660 of the liquid cooling plate 600 more uniform.

[0187] In the liquid cooling plate 600 provided in this embodiment, the upper heat exchange channel 640 and the lower heat exchange channel 650 are both distributed in the heat exchange area 660, and the flow directions of the flowing media in the two are opposite, so the portion with a higher temperature in the upper heat exchange channel 640 corresponds to the portion with a lower temperature in the lower heat exchange channel 650, and the portion with a lower temperature in the upper heat exchange channel 640 corresponds to the portion with a higher temperature in the lower heat exchange channel 650. Under the joint 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 a strong temperature uniformity. This helps to keep the battery cells 20 at different positions in the heat exchange area 660 within a preset temperature range.

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

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

[0190] like Fig.26 and Fig. 27In 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] For example, Fig.26 The upper heat exchange channel 640 is arranged in a serpentine shape, and an isolation rib 622 can be set between two adjacent parallel channel sections to define a first sub-lower heat exchange channel 651 or a second sub-lower heat exchange channel 652 between the isolation rib 622 and the upper heat exchange channel 640.

[0192] The lower heat exchange channel 650 is divided into a first sub-lower heat exchange channel 651 and a second sub-lower heat exchange channel 652 arranged on both sides of the upper heat exchange channel 640. On the one hand, the upper heat exchange channel 640 and the lower heat exchange channel 650 can be more evenly distributed in the heat exchange zone 660, which helps to ensure that the temperatures at different positions of the heat exchange zone 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 zone 660, which helps to improve the overall heat exchange capacity of the liquid cooling plate 600.

[0193] like Fig.28 , Fig.29 and Fig.30 In some embodiments, the width of the upper heat exchange channel 640 is greater than that of any one of the first lower sub-heat exchange channel 651 and the second lower sub-heat exchange channel 652 .

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

[0195] For example, Fig.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 may be 3 mm to 7 mm, for example, 3 mm, 4 mm, 5 mm, 6 mm or 7 mm.

[0196] For example, Fig.30 The width P1 of the upper heat exchange channel 640 may 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 lower sub-heat exchange channel 651 may be the same as the width of the second lower sub-heat exchange channel 652, and the width P2 may 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 channel 650 includes the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652, if the width of the upper heat exchange channel 640 is small, the heat exchange capacity of the upper heat exchange channel 640 and the heat exchange capacity of the lower heat exchange channel 650 will be quite different. For example, to avoid the above situation, the width of the upper heat exchange channel 640 is designed to be larger than any one of the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652 to ensure the uniform temperature effect of the liquid cooling plate 600.

[0200] like Fig.26 In some embodiments, a liquid outlet extension channel 670 and / or a liquid inlet extension channel 680 are further defined between the flow channel plate 620 and the lower cold plate 630; one end of the liquid outlet extension channel 670 is connected to the lower heat exchange channel 650, and the other end extends to a position close to the upper heat exchange channel 640 connected to the first liquid outlet port 612 and is connected to 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 channel 680 is connected to the lower heat exchange channel 650, and the other end extends to a position close to the upper heat exchange channel 640 connected to the first liquid inlet port 611 and is connected to 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 may be provided on the plate surface of the lower cold plate 630 facing the flow channel plate 620 to define the liquid outlet extension channel 670 and / or the liquid inlet extension channel 680 when the lower cold plate 630 and the flow channel plate 620 are fitted and connected.

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

[0203] like Fig.26 In some embodiments, the liquid outlet extension channel 670 is connected to the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652 at the same time, and the liquid inlet extension channel 680 is connected to the first sub-lower heat exchange channel 651 and the second sub-lower heat exchange channel 652 at the same time.

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

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

[0206] A battery pack includes the liquid cooling plate 600 according to the above embodiments.

[0207] like Fig.31 , Fig.32 and Fig.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 arranged between the bottom plate 710 and the cover plate 720, the bottom plate 710, the cover plate 720 and the circumferential frame 730 together form a closed box internal space 740; the liquid cooling plate 600 is configured as the bottom plate 710 and / or the cover plate 720.

[0208] The internal space 740 of the box 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 bonded and fixed to the bottom plate 710 and / or at least part of the cover plate 720, which, on the one hand, ensures that the battery cells 20 can remain stable in the internal space 740 of the box, and on the other hand, helps to improve the heat exchange efficiency of the bottom plate 710 and / or the cover plate 720 formed by the liquid cooling plate 600 to the battery cells 20.

[0209] like Fig.31 , Fig.32 and Fig.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, and the partition beam 750 is used to separate the internal space 740 of the box into a first subspace 741 and a second subspace 742, and the first subspace 741 is used to accommodate the plurality of battery cells 20; the cover plate 720 includes a first sub-cover plate 721 corresponding to the first subspace 741, and a second sub-cover plate 722 corresponding to the second subspace 742; the liquid cooling plate 600 is configured as the first sub-cover plate 721.

[0210] Exemplarily, one 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 (eg, a threaded hole, a rivet nut, or a welding nut) for connecting the cover plate 720 .

[0211] Exemplarily, the second subspace 742 may be used to accommodate electrical components, such as high-voltage electrical components.

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

[0213] Normally, the frequency of maintenance and operation of the battery cell 20 is low, and the frequency of maintenance and operation of the electrical components (such as control components or transformer components, etc.) in the battery pack is high. At the same time, the battery cell 20 has a high demand for heat exchange performance, while the electrical components have a low demand for heat exchange performance. In summary, in this embodiment, by setting a partition beam 750 in the internal space 740 of the box body, the internal space 740 of the box body is divided into a first subspace 741 for accommodating the battery cell 20 and a second subspace 742 for accommodating the electrical components. At the same time, the cover plate 720 is split into a first sub-cover plate 721 and a second sub-cover plate 722 that are independent of each other. When the first sub-cover plate 721 is connected to the circumferential frame 730, the first subspace 741 can form an approximately closed space. Similarly, when the second sub-cover plate 722 is connected to the circumferential frame 730, the second subspace 742 can form an approximately closed space. When the battery cell 20 does not need maintenance or operation, regardless of whether the second sub-cover 722 is separated from the circumferential frame 730, the first sub-space 741 can remain in a relatively closed state. On the one hand, it can protect the battery cell 20 in the first sub-space 741, and on the other hand, it also helps to maintain the temperature in the first sub-space 741 at a preset temperature.

[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] like Fig.31 , Fig.32 , Fig.33 , Fig.34 and Fig.35 In some embodiments, the battery pack further includes a liquid inlet manifold assembly 800 and a liquid outlet manifold assembly 900; the liquid inlet manifold assembly 800 includes a liquid inlet main pipe 810, a liquid inlet branch pipe 820 connected to the first liquid inlet port 611 and the second liquid inlet port 613 in one-to-one correspondence, and a liquid inlet manifold body 830 disposed in the second subspace 742; the liquid inlet branch pipe 820 is connected to the liquid inlet main pipe 810 through the liquid inlet manifold body 830; the liquid outlet manifold assembly 900 includes a liquid outlet main pipe 910, a liquid outlet branch pipe 920 connected to the first liquid outlet port 612 and the second liquid outlet port 614 in one-to-one correspondence, and a liquid outlet manifold body 930 disposed in the second subspace 742; the liquid outlet branch pipe 920 is connected to the liquid outlet main pipe 910 through the liquid outlet manifold body 930; the partition beam 750 is provided with a pipeline avoidance through hole 751 for the liquid inlet branch pipe 820 and the liquid outlet branch pipe 920 to pass through.

[0216] Exemplarily, both the inlet and outlet flow confluence bodies 830 and 930 may be multi-way (eg, two-way, three-way, or four-way) connectors.

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

[0218] For example, the liquid inlet branch pipe 820 can be connected to the liquid inlet confluence body 830, the cover plate 720 (when the cover plate 720 is the liquid cooling plate 600 or the existing liquid cooling plate) or the bottom plate 710 (when the bottom plate 710 is the liquid cooling plate 600 or the existing liquid cooling plate) by means of a quick plug, welding or riveting. Similarly, the liquid outlet branch pipe 920 can be connected to the liquid outlet confluence 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 may be a circular hole, a rectangular hole or a hole of an irregular shape.

[0220] For example, when the cover plate 720 or the bottom plate 710 does not use the liquid cooling plate 600 of the above embodiment, a liquid cooling plate or a harmonica liquid cooling tube made of an aluminum alloy extruded profile may also be used.

[0221] Exemplarily, the liquid inlet manifold 810 and the liquid outlet manifold 910 extend out of the housing 700 through the circumferential frame 730 .

[0222] The coolant flows into the liquid inlet confluence body 830 through the liquid inlet main pipe 810, and is divided in the liquid inlet confluence body 830, enters each liquid inlet branch pipe 820, and then enters the first sub-cover plate 721 formed by the liquid cooling plate 600 or the existing liquid cooling plate and the bottom plate 710 formed by the liquid cooling plate 600 or the existing liquid cooling plate 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 confluence body 930 through the liquid outlet branch pipe 920 to achieve confluence, and then flow out of the box 700 through the liquid outlet main pipe 910.

[0223] Since there is only one inlet manifold 810 and one outlet manifold 910, it is convenient to connect with the coolant pipeline outside the box 700. At the same time, since the inlet branch pipe 820 and the outlet branch pipe 920 are both located in the inner space 740 of the box, the inlet branch pipe 820 and the outlet branch pipe 920 can be protected by the box 700, and the appearance of the battery pack can also be simpler.

[0224] like Fig.36 , Fig.37 , Fig.38 and Fig.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. Fig.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. Fig.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] A person skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application (including the claims) is limited to these examples. In line with the concept of the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

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

[0230] The embodiments of the present application are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A battery pack, characterized in that: include: A battery cell stack, the battery cell stack comprising at least one battery cell group, each of the battery cell groups comprising at least two battery cell layers stacked in layers; The battery cell stack includes a plurality of battery cells, each of which includes a battery cell body, the battery cell body includes a connection end, the connection end is provided with a first pole and a second pole, the polarities of the first pole and the second pole are opposite; the connection end is also provided with an explosion-proof valve, and the explosion-proof valve is located between the first pole and the second pole; The plurality of battery cells include stacked battery cells for constituting the battery cell layers, and interlayer connected battery cells; the connection ends of the stacked battery cells are arranged opposite to the connection ends of the interlayer connected battery cells, so that the first pole of the interlayer connected battery cells is directly electrically connected to the second pole of the stacked battery cells of one of the two battery cell layers, and the second pole of the interlayer connected battery cells is directly electrically connected to the first pole of the stacked battery cells of the other one; The battery pack further includes a cell detection device, and the cell detection device includes: The detection body is provided with a smoke exhaust channel extending along a first direction, and the end of the smoke exhaust channel penetrates the surface of the detection body to form a smoke exhaust port; at least one side of the detection body is provided with a smoke inhalation port, one end of the smoke inhalation port is connected to the smoke exhaust channel, and the other end is used to correspond to the explosion-proof valve of the battery cell; An information collection component, comprising a plurality of collection parts arranged on the detection body, the plurality of collection parts being arranged at intervals at least along the first direction, the collection parts being used to be connected to the poles of the battery cells to collect the temperature and / or voltage of the battery cells; The smoking port and the collecting part are arranged on the same side of the detection body, and the smoking port and one end of the battery cell corresponding to the explosion-proof valve can cover the explosion-proof valve.

2. The battery pack according to claim 1, characterized in that: In the same battery core layer, at least two stacked battery cores are included, and two adjacent stacked battery cores are electrically connected; the interlayer connecting battery core is arranged at one end of the battery core layer.

3. The battery pack according to claim 2, characterized in that: The multiple battery cells also include same-layer connected battery cells, which are staggered with the stacked battery cells, and the connection ends of the same-layer connected battery cells are arranged opposite to the connection ends of the stacked battery cells, so that the first pole of the same-layer connected battery cells is directly electrically connected to the second pole of one of the two adjacent stacked battery cells in the same battery cell layer, and the second pole of the same-layer connected battery cells is directly electrically connected to the first pole of the other one.

4. The battery pack according to claim 1, characterized in that: Each of the battery cell layers includes at least two stacked battery cells; the stacked battery cells in one of two adjacent battery cell layers are staggered with the stacked battery cells in the other one; and each of the stacked battery cells is directly electrically connected to the corresponding stacked battery cells in different battery cell layers through the interlayer connecting cells.

5. The battery pack according to claim 1, characterized in that: Adjacent battery cells in the battery cell stack are fixedly connected.

6. The battery pack according to claim 5, characterized in that: The first pole and the second pole are spaced apart along the width direction of the battery cell body, and the thickness direction of the battery cell body is perpendicular to the width direction of the battery cell body; the thickness of the battery cell body is defined as H, the width of the battery cell body is defined as W, the distance between the center point of the first pole and the center point of the second pole is defined as M, W:H:M=2:1:

1.

7. The battery pack according to claim 6, characterized in that: An adhesive layer is provided between the side walls of adjacent battery core bodies, and the adhesive layer is used to fix and connect the adjacent battery cores.

8. The battery pack according to claim 1, characterized in that: A conductive adhesive layer is provided between the first pole and the corresponding second pole, and the conductive adhesive layer is used to directly electrically connect the first pole and the second pole.

9. The battery pack according to claim 8, characterized in that: The connection end of the battery cell is provided with a glue overflow groove surrounding the first pole and / or the second pole.

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