Battery module, battery pack, electrical device

Abstract

Battery module comprising: a cell group comprising an upper-layer cell group and a non-upper-layer cell group, each layer of the cell group comprising a plurality of cells (10) arranged along a first direction;a support comprising an intermediate support (20) and an upper layer support (30), wherein the intermediate support (20) is arranged between the upper layer cell group and the non-upper layer cell group and / or between two adjacent layers of the non-upper layer cell group, wherein the upper layer support (30) is arranged on a side of the upper layer cell group facing away from the non-upper layer cell group, wherein along a stacking direction of the cell group the intermediate support (20) and the upper layer support (30) are each provided with a plurality of first receiving grooves (21) on a side surface facing the cell group, wherein the multiple first receiving grooves (21) are arranged along the first direction, wherein the multiple first receiving grooves (21) are uniquely assigned to the plurality of cells (10) of the cell group adjacent thereto and the cells (10) are fixed in the first receiving grooves (21) assigned to them.

Description

TECHNICAL FIELDThe application relates to the field of battery technology, specifically to a battery module, a battery pack, an electrical device.PRIOR ARTIn order for a battery module to have a relatively high capacity, the battery module is generally composed of a plurality of cells by a plurality of parallel and multi-row connections.DISCLOSURE OF THE APPLICATIONHowever, in the related module construction, the construction of stacked cells in groups is complex, making the parts more numerous, the process is difficult, and the reliability of the product is greatly reduced.The present application provides a battery module. It comprises: a cell group comprising a top layer cell group and a non-top layer cell group, wherein each layer of the cell group comprises a plurality of cells arranged along a first direction; a support comprising an intermediate support and a top layer support, wherein the intermediate support is arranged between the top layer cell group and the non-top layer cell group and / or between two adjacent layers of the non-top layer cell group, wherein the top layer support is arranged on a side of the top layer cell group facing away from the non-top layer cell group, along the stacking direction of the cell group, the intermediate support and the top layer support are each provided with a plurality of first receiving grooves on a side surface facing the cell group, wherein the plurality of first receiving grooves are arranged along the first direction, wherein the plurality of first receiving grooves are assigned one-to-one to the plurality of cells of the cell group adjacent thereto, and the cells are fixed in the associated first receiving grooves.The present application further provides a manufacturing method of a battery module. It comprises the steps of: providing a support comprising an intermediate support and a top layer support, wherein the two opposite sides of the intermediate support and one side of the top layer support are provided with a plurality of first receiving grooves, and the plurality of first receiving grooves are arranged along the first direction; providing a cell, fixing the cell in the support such that the cell is arranged in the first receiving groove and the plurality of first receiving grooves are uniquely associated with the plurality of cells; providing an adhesive such that the adhesive is arranged between the first receiving groove and the cell; stacking the top layer support and the intermediate support one above the other, and arranging the first receiving groove of the top layer support such that it faces the adjacent intermediate support; providing a bus bar, connecting the positive and negative electrodes of the cell through the bus bar to obtain a battery module.The present application further provides a battery pack. It comprises: a tray comprising a lid and a housing, the lid covering the housing; an above battery module disposed in the tray.The present application further provides a manufacturing method of a battery pack. It comprises the following steps:Providing the above battery module; providing a tray comprising a lid and a housing, wherein the inner bottom surface of the housing is provided with a plurality of second receiving grooves along the first direction, disposing the battery module in the housing, disposing the cell on a side of the battery module opposite to the top layer support in the second receiving groove, and providing an adhesive between the second receiving groove and the cell therein; covering the housing with the lid to obtain a battery pack.The application further provides an electrical device including a battery module or a battery pack or a battery group described above.Advantageous Effects:The battery module provided in the present application can realize quick and stable fixation of the cell by disposing an intermediate support between the adjacent two layers of cell groups and an upper layer support on the side of the upper layer cell group other than the non-upper layer cell group, and by fixing the circumferential surface of the cell in the first accommodation groove on both sides of the intermediate support and the first accommodation groove on the side of the upper layer support in the vicinity of the cell group, so that the cell fixing structure can be simplified, the parts can be reduced, the process is simplified, and the cost is reduced.The manufacturing method of the battery module provided in this application may result in the cell being quickly and stably fixed on the support by disposing the cell in the first accommodation groove and disposing an adhesive between the cell and the first accommodation groove, and the process is simple, the structure is simple, and the parts may be reduced and the cost may be lowered.The battery module provided in the present application adopts the above-mentioned temperature sensor assembly, and the temperature sensor assembly is disposed in the gap between at least two adjacent cell side walls, and when the cooling plate of the battery module is disposed at the end position of the cell, the accuracy of the temperature sensor in collecting the cell temperature is higher, so that the safety of the battery module is effectively improved.The manufacturing method of the battery pack provided in the present application is that the battery module can be quickly and stably fixed in the case by disposing an adhesive between the second accommodation groove and the cell therein, and the method is simple.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic diagram of the structure of a battery module provided in the embodiment of the present application; FIG. 2 is a schematic diagram of the structure of an intermediate bearing provided in the embodiment of the present application; FIG. 3 is a schematic diagram of the structure of a topsheet support provided in the embodiment of the present application; FIG. 4 is a schematic diagram of the structure of a c-battery cell group provided in the embodiment of the present application; FIG. 5 is an exploded view of a battery pack provided in the embodiment of the present application; FIG. 6 is a schematic diagram of the structure of a kind of shell provided in the embodiment of the present application.Description of the Reference Numerals:Cell -10, positive electrode -111, negative electrode -112, intermediate support -20, first receiving groove -21, upper layer support -30, first adhesive layer -40, first end plate -50, first positioning groove -51, bus bar -60, buckle -70, lid -80, case -90, second receiving groove -91, second end plate -92, second positioning groove -921, second adhesive layer -100, third adhesive layer -110, side plate -120, groove -121.EMBODIMENTS OF THE APPLICATIONIn the present application, the terms "connected to each other", "connecting", "fastening" or the like are intended to be understood in the broader sense unless expressly stated otherwise. Thus, for example, this can be a fixed, a releasable or a one-piece connection as well as a mechanical and also an electrical connection. In addition, direct connections, indirect connections or connections produced via an intermediate piece, as well as internal connections of two elements or interactions of two elements are also conceivable. One of ordinary skill in the art can be based on the subject to determine what meaning the terms mentioned according to the present application are intended to have.In the description of the present embodiment, the terms "upper", "lower", "left", "right", etc. are used with reference to the illustrated orientation or positional relationship in each figure to describe only the operation and simplify the description as appropriate. In other words, these terms are used to indicate neither in-depth nor explicitly the positioning and the configuration and operation of the relevant device or of the relevant element in a predetermined positioning, and therefore there is also no restriction of the application here. Moreover, the terms "first" and "second" having no particular meaning are used only to achieve distinction in the description.As shown in FIGS. 1 to 4, according to a first aspect, an embodiment of the present application provides a battery module including:a cell group comprising a top layer cell group and a non-top layer cell group, wherein each layer of the cell group comprises a plurality of cells 10 arranged along a first direction A;a support comprising an intermediate support 20 and a top layer support 30, wherein the intermediate support 20 is arranged between the top layer cell group and the non-top layer cell group and / or between two adjacent layers of the non-top layer cell group, wherein the top layer support 30 is arranged on a side of the top layer cell group facing away from the non-top layer cell group, along the stacking direction B of the cell groups, the intermediate support 20 and the top layer support 30 are each provided with a plurality of first receiving grooves 21 on a side surface facing the cell group, wherein the plurality of first receiving grooves 21 are arranged along the first direction A, wherein the plurality of first receiving grooves 21 of the plurality of cells 10 are uniquely associated with the cell group adjacent thereto, and the cells 10 are fixed in the associated first receiving grooves 21.It can be understood that the cell group includes a plurality of cells 10 arranged along the first direction A, and that the axial direction of the plurality of cells 10 may be perpendicular to the first direction A. The electrodes having the same polarity of a plurality of cells 10 of the same layer of the cell group may be disposed on the same side or opposite side of the cell group. For example, in a plurality of cells 10 in the same layer of the cell group, the electrodes having the same polarity of two adjacent cells 10 are located on opposite sides of the cell group. The shape of the first containment vessel 21 may be a standard geometric shape, such as a semi-circle, arc, square, rectangle, and so forth. For example, the shape of the first receiving groove 21 can be adapted to the circumferential shape of the cell 10, so that the fixing of the first receiving groove 21 to the cell 10 is more stable. The size of the first accommodation groove 21 can be arbitrarily set as long as the periphery of the cell 10 exposed in the first accommodation groove 21 can be accommodated. The first accommodation groove 21 has a corresponding relationship with the number of cells 10. For example, the first accommodation groove 21 and the first cell 10 may satisfy the relationship 1:N, where N is a positive integer greater than or equal to 1. It can be understood that when N is 1, the relationship between the first accommodation groove 21 and the cell 10 is one to one, and the one-to-one correspondence may result in the fixation of the cell 10 having better stability. The number of layers of the battery pack may be adjusted as needed. The shape of the cell 10 may be cylindrical, square or other shapes. Non-upper layer cell groups may include single layer cell groups or multi layer cell groups. The non-upper layer cell group includes a layer of cell groups, and the middle bracket 20 is disposed between the upper layer cell group and the non-upper layer cell group. The non-upper layer cell group includes a plurality of cell groups, and the middle bracket 20 may be disposed between the upper layer cell group and the non-upper layer cell group, and may also be disposed between the adjacent two layers of the non-upper layer cell group, and may also be disposed between the upper layer cell group and the non-upper layer cell group between the adjacent two layers of the non-upper layer cell group.In some embodiments, the perimeter surfaces of multiple cells 10 of the topsheet cell group are wrapped in the first receiving grooves 21 of the topsheet support 30 and the first receiving grooves 21 of the intermediate support 20 adjacent the topsheet support 30; and / orthe non-upper layer cell group includes a middle cell group and a lower cell group, wherein the middle cell group is located between the upper layer cell group and the lower cell group, and the circumferential surfaces of the plurality of cells 10 of the middle cell group are wrapped in the first receiving grooves 21 of the adjacent intermediate support 20.It can be understood that the periphery of the cell 10 of the upper layer cell group may be partially disposed in the first receiving groove 21 of the upper layer support 30 and the first receiving groove 21 of the intermediate support 20 adjacent to the upper layer support 30, and may also be fully disposed in the first receiving groove 21 of the upper layer support 30 and the first receiving groove 21 of the intermediate support 20 adjacent to the upper layer support 30. The peripheral surface of the cell 10 of the interlayer cell group may be partially disposed in the first accommodation groove 21, or may be completely enveloped in the first accommodation groove 21.The peripheral surface of the cell 10 is completely enveloped, whereby the stability of the cell 10 in the first receiving groove 21 can be improved.In some embodiments, a first adhesive layer 40 is disposed between the first receiving groove 21 and the circumferential surface of the cell 10 therein.It is understood that the first adhesive layer 40 may be disposed on a part of the circumferential surface of the cell 10 and may also be disposed on the entire circumferential surface of the cell 10. The first adhesive layer 40 is disposed on the entire circumferential surface of the cell 10, and the connection stability of the cell 10 and the first accommodation groove 21 can be improved. The thickness of the first adhesive layer 40 can be arbitrarily set.In some embodiments, the intermediate support 20 and the upper layer support 30 each include two first end plates 50 respectively disposed at the positive and negative ends of the cell 10, each first end plate 50 being respectively provided with a first positioning groove 51, each first positioning groove 51 being connected to a first receiving groove 21, and the positive electrode 111 and the negative electrode 112 of the cell 10 being disposed in the first positioning grooves 51 of the two first end plates 50.It can be understood that the first positioning groove 51 can accommodate a part of positive / negative electrodes of the cell 10 and also can accommodate the entire positive / negative electrode of the cell 10. The positive electrode 111 and the negative electrode 112 of the cell 10 are respectively disposed in the first positioning groove 51, and the first positioning groove 51 of two adjacent supports (including the upper layer support and the intermediate support) may be combined to receive the positive / negative pole of the cell 10, or the first positioning groove 51 of one support (including the upper layer support and the intermediate support) may separately receive the positive / negative electrode of the cell 10. The first positioning groove 51 of the upper and lower adjacent pillars (including the upper-layer pillar and the intermediate pillar) is combined to receive the positive / negative electrode of the cell 10, whereby the assembly and positioning of the upper and lower two pillars can be made faster and more accurate.In some embodiments, the first positioning groove 51 penetrates the first end plate 50 along the thickness direction of the first end plate 50, the positive electrode 111 and the negative electrode 112 of the cell 10 of different layers are connected by the bus bar 60, and the bus bar 60 is disposed on a side of the first end plate 50 opposite to the cell 10.It can be understood that the thickness of the first positioning groove 51 may be equal to the thickness of the positive electrode 111 and the negative electrode 112 of the cell 10, and may also be larger than the thickness of the positive electrode 111 and the negative electrode 112 of the cell 10, and may also be smaller than the thickness of the positive electrode 111 and the negative electrode 112 of the cell 10.In some embodiments, the topsheet support 30 is connected to the intermediate support 20 by a buckle 70; and / orthe intermediate support 20 is provided in a plurality, and two adjacent intermediate supports 20 are connected by the buckle 70.It is understood that the upper-layer support 30 and the intermediate support 20 are connected by the buckle 70, a clamping hook may be disposed on the upper-layer support 30, a clamping groove may be disposed on the intermediate support 20, a clamping groove may also be disposed on the upper-layer support 30, a clamping hook is disposed on the intermediate support 20, and the clamping hook may be clamped in the clamping groove, so that the connection of the two is realized. The buckle 70 can be disposed around the outside of the support, which is easy to install.In some embodiments, the intermediate support 20 is integrally molded; and / or the topsheet support 30 is integrally molded.In the second aspect, the present application provides a manufacturing method of a battery module. It comprises the following steps:providing a support comprising an intermediate support 20 and a top layer support 30, wherein the two opposite sides of the intermediate support 20 and one side of the top layer support 30 are provided with a plurality of first receiving grooves 21, and the plurality of first receiving grooves 21 are arranged along the first direction A;providing a cell 10, fixing the cell 10 in the support such that the cell 10 is disposed in the first receiving groove 21 and the plurality of first receiving grooves 21 are uniquely associated with the plurality of cells 10;providing an adhesive such that the adhesive is disposed between the first receiving groove 21 and the cell 10;stacking the topsheet support 30 and the intermediate support 20, and disposing the first receiving groove 21 of the topsheet support 30 so as to face the adjacent intermediate support 20;providing a bus bar 60, connecting the positive and negative electrodes of the cell 10 through the bus bar 60 to obtain a battery module.It is understood that the cell 10 is fixed in the support so that the first receiving groove 21 and the cell 10 are provided with adhesive and the top layer support 30 and the intermediate support 20 are stacked in layers, can be made synchronous, and can also be made stepwise. When stacking the topsheet support 30 and the intermediate support 20 one above the other, the adhesive may be disposed between the first accommodation groove 21 and the cell 10, the cell 10 may be fixed in the support, one side of the cell 10 may be first fixed in the support, the adhesive may be disposed between one side of the cell 10 and the first accommodation groove 21, and finally, the supports fixed with the cell 10 are sequentially stacked, and the adhesive is disposed between the other side of the cell 10 and the first accommodation groove 21. An adhesive may be coated between the first receiving groove 21 and the cell 10. The adhesive may be coated in the surface of the cell 10 or coated in the first receiving groove 21, and the cell 10 is then disposed in the first receiving groove 21 such that an adhesive is disposed between the first receiving groove 21 and the cell 10, and the cell 10 is also disposed in the first receiving groove 21, and the adhesive is injected into the first receiving groove 21 and the cell 10 such that an adhesive is disposed between the first receiving groove 21 and the cell 10. It may be adjusted according to the shape, type and properties of the adhesive, for example, the adhesive used may be paste-like, then may be adjusted by the coating mode so that the adhesive may completely cover the surface of the cell 10 and the cell 10 is better fixed in the first receiving groove 21. The number of the topsheet support 30 is one, and the number of the intermediate support 20 may be plural, which can be adjusted as needed. When the intermediate support 20 is multi-stage, the upper bracket 30 and a plurality of intermediate supports 20 are sequentially arranged. The bus bar 60 may be disposed by welding.As shown in FIGS. 1 to 6, in the third aspect, the application provides a battery pack including:a tray comprising a lid 80 and a housing 90, the lid 80 covering the housing 90;a battery module as above disposed in the tray.In some embodiments, the lower cell group in the cell groups is disposed near the inner bottom of the case 90, the inner bottom of the case 90 is provided with a plurality of second accommodation grooves 91 along the first direction A, the plurality of second accommodation grooves 91 are uniquely associated with the lower cell group, and the circumferential surface of each cell of the lower cell group is partially fixed in the second accommodation groove 91 associated therewith.It can be understood that the shape of the second accommodation groove 91 may be a standard geometric shape such as a semicircle, an arc, a square, a rectangle, etc., and the shape of the second accommodation groove 91 is matched to the circumferential shape of the lower cell 10, so that the fixation of the second accommodation groove 91 to the lower cell 10 is more stable. The size of the second accommodation groove 91 can be adjusted as needed as long as it can accommodate the periphery of the lower cell 10 exposed to the second accommodation groove 91. The numbers of the second accommodation groove 91 and the lower cell 10 are one-to-one, and the second accommodation groove 91 and the lower cell 10 may be one-to-many allocated, and the one-to-one correspondence has better stability.In some embodiments, a second adhesive layer 100 is disposed between the second receiving groove 91 and the circumferential surface of the lower cell group cells 10 therein; and / orThe inner bottom surface of the end surface of the housing 90 is provided with two second end plates 92, the two second end plates 92 are respectively disposed at the positive and negative ends of the cell 10, each of the second end plates 92 is respectively provided with a second positioning groove 921, each of the second positioning grooves 921 communicates with the first second receiving groove 91, and the positive electrode 111 and the negative electrode 112 of the cell 10 of the lower cell group are disposed in the second positioning grooves 921 of the two second end plates 92.It is understood that the second adhesive layer 100 may be disposed on the part of the circumferential surface of the lower cell 10 exposed in the case 90, and may also be disposed on the entire circumference of the lower cell 10 exposed in the case 90. The second adhesive layer 100 is disposed on the entire periphery of the lower cell 10 exposed in the case 90, so that the connection stability of the lower cell 10 and the second accommodation groove 91 can be improved. The thickness of the second adhesive layer 100 may be arbitrarily set.In some embodiments, a third adhesive layer 110 is disposed between both sides of the battery module along a first direction A and the housing 90.It can be understood that the third adhesive layer 110 can be arranged on a partial region of the two sides of the battery module along the first direction A and can also be arranged over the whole area on both sides of the battery module along the first direction A. The second adhesive layer 100 is disposed on all sides of the battery module along both sides of the first direction A, and the connection stability between the battery module and the case 90 can be improved. The shape of the third adhesive layer 110 corresponds to the gap between the battery module and the case 90 along both sides of the first direction A. The thickness of the third adhesive layer 110 can be arbitrarily set.In some embodiments, the upper layer support 30 and the intermediate support 20 of the battery module further include two side plates 120 disposed respectively on two sides of the cell group along the first direction A, the third adhesive layer 110 is disposed between the side plate 120 and the case 90, and the side plate 120 is provided with a groove 121 on a side facing the case 90.It is understood that the size of the side plate 120, the shape can be adjusted as needed. The side plate 120 of the topsheet support 30 and the intermediate support 20 may abut against each other so that they can be combined into one whole, and then the covering area of the third adhesive layer 110 is improved. The number of the grooves 121 on the side plate 120, size, shape, depth can be adjusted as needed.In the fourth aspect, the present application provides a manufacturing method of a battery pack. It comprises the following steps:providing the above battery module;providing a shell comprising a lid 80 and a housing 90, wherein the inner bottom side of the housing 90 is provided with a plurality of second receiving grooves 91 along the first direction A, arranging the battery module in the housing 90, arranging the cell 10 on a side of the battery module facing away from the top layer support 30 in the second receiving groove 91, and providing an adhesive between the second receiving groove 91 and the cell 10 located therein;covering the housing 90 with the lid 80 to obtain a battery pack.It can be understood that an adhesive is disposed between the second receiving groove 91 and the cell 10 therein, the adhesive may be coated on the surface of the cell 10, the adhesive may also be coated in the second receiving groove 91, and the cell 10 is disposed in the second receiving groove 91 such that an adhesive is disposed between the second receiving groove 91 and the cell 10, and the cell 10 may be disposed in the second receiving groove 91, and then the adhesive is injected into the second receiving groove 91 and the cell 10 such that an adhesive is disposed between the second receiving groove 91 and the cell, may be adjusted according to the shape, type, characteristics of the adhesive, for example, the adhesive used may be paste-like, then may be adjusted by the coating mode, the adhesive may completely cover the surface of the cell 10, such that the cell 10 is better fixed in the second receiving groove 91.In some embodiments, covering the housing 90 with the lid 80 includes:covering the housing 80 with the lid 90 after providing an adhesive between the both sides of the battery module along the first direction A and the housing 90.It can be understood that the adhesive is disposed between the two sides of the battery module along the first direction A and the case 90, and the adhesive can be poured between both sides of the battery module along the first direction A and the case 90 after the battery module is inserted into the case 90, so that the adhesive can be prevented from being pushed out when the battery module enters the tray, and the adhesive can be a paste-like adhesive that can prevent its flow to other parts and help fill the gap between the two sides of the battery module along the first direction A and the case 90 simultaneously.In a fifth aspect, the embodiment of the present application provides an electric device including a above battery module or a above battery pack.

Claims

A battery module comprising: a cell group comprising a top layer cell group and a non-top layer cell group, each layer of the cell group comprising a plurality of cells (10) arranged along a first direction; a support comprising an intermediate support (20) and a top layer support (30), wherein the intermediate support (20) is arranged between the top layer cell group and the non-top layer cell group and / or between two adjacent layers of the non-top layer cell group, wherein the top layer support (30) is arranged on a side of the top layer cell group facing away from the non-top layer cell group, wherein, along a stacking direction of the cell group, the intermediate support (20) and the upper layer support (30) are each provided with a plurality of first receiving grooves (21) on a side surface facing the cell group, wherein the plurality of first receiving grooves (21) are arranged along the first direction, wherein the plurality of first receiving grooves (21) of the plurality of cells (10) are assigned one-to-one to the cell group adjacent thereto and the cells (10) are fixed in the first receiving grooves (21) assigned to them.The battery module of claim 1, wherein the circumferential surfaces of a plurality of cells (10) of the top layer cell group are wrapped in the first receiving grooves (21) of the top layer support (30) and the first receiving grooves (21) of the intermediate support (20) adjacent to the top layer support (30); and / or wherein the non-top layer cell group comprises a middle cell group and a lower cell group, wherein the middle cell group is located between the top layer cell group and the lower cell group, and the circumferential surfaces of the plurality of cells (10) of the middle cell group are wrapped in the first receiving grooves (21) of the adjacent intermediate support (20).The battery module according to claim 1 or 2, wherein a first adhesive layer (40) is disposed between the first receiving groove (21) and the circumferential surface of the cell (10) located therein.The battery module according to any one of claims 1 to 3, wherein the intermediate support (20) and the upper layer support (30) each include two first end plates (50) respectively disposed at the positive and negative ends of the cell (10), each first end plate (50) being respectively provided with a first positioning groove (51), each first positioning groove (51) being connected to a first receiving groove (21), the positive (111) and negative (112) electrodes of the cell (10) being respectively disposed in the first positioning grooves (51) of the two first end plates (50).The battery module according to claim 4, wherein the first positioning groove (51) penetrates through the first end plate (50) along a thickness direction of the first end plate (50), the positive (111) and negative (112) electrodes of the cells (10) of the cell groups of different layers are connected by a bus bar (60), the bus bar being disposed on a side of the first end plate (50) opposite to the cell (10).The battery module according to any one of claims 1 to 5, wherein the top layer support (30) is connected to the intermediate support (20) by a latch (70); and / or wherein the intermediate support (20) is provided in a plurality, wherein two adjacent intermediate supports (20) are connected by a latch (70).The battery module according to any one of claims 1 to 6, wherein the intermediate support (20) is integrally formed; and / or wherein the upper layer support (30) is integrally formed.A battery pack comprising: a tray comprising a lid (80) and a housing (90), the lid (80) closing the housing (90); a battery module according to any one of claims 1 to 7; or a battery module produced by the manufacturing method of a battery module according to claim 8, wherein the battery module is disposed in the tray.The battery pack according to claim 8, wherein a lower cell group in the cell groups faces an inner bottom of the case (90), and the inner bottom of the case (90) is provided with a plurality of second accommodation grooves (91) along a first direction, the plurality of second accommodation grooves (91) are uniquely associated with a plurality of cells (10) of the lower cell group, and a circumferential surface of each cell (10) of the lower cell group is partially fixed in the second accommodation groove (91) associated therewith.The battery pack according to claim 9, wherein a second adhesive layer (100) is disposed between the second accommodation groove (91) and the circumferential surface of the lower cell group cell (10) therein; and / or wherein an inner lower surface of an end surface of the case (90) is provided with two second end plates (92), the two second end plates (92) being respectively disposed at the positive and negative ends of the cell (10), each second end plate (92) being respectively provided with a second positioning groove (921), each second positioning groove (921) being in communication with a second accommodation groove (91), a positive (111) and a negative electrode (112) of the lower cell group cell (10) being respectively disposed in the second positioning grooves (921) of the two second end plates (92).The battery pack of any one of claims 8 to 10, wherein a third adhesive layer (110) is disposed between both sides of the battery module along a first direction and the case (90).The battery pack of claim 11, wherein a top layer support (30) and an intermediate support (20) of the battery module each further comprise two side plates (120) disposed on both sides of the cell group along the first direction, the third adhesive layer (110) being disposed between the side plate (120) and the case (90), a side of the side plate (120) facing the case (90) being provided with a groove (121).An electrical device comprising a battery module according to any one of claims 1 to 7 or a battery pack according to any one of claims 8 to 12.

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