Battery pack and battery pack

Abstract

The utility model provides a battery pack and a battery pack. The battery pack comprises at least two battery cell stacking bodies, and the middle plate is connected between two adjacent battery cell stacking bodies along the stacking direction of the battery cells in each battery cell stacking body, and the middle plate is used for being connected with a battery pack box body. According to the battery pack and the battery pack provided by the invention, the two battery core stacking bodies can be connected to the battery pack box body through the same middle plate, namely, the battery core stacking bodies can be connected into the battery pack box body through the middle plates with the number smaller than that of the battery core stacking bodies, so that the space, occupied by structural parts except the battery core stacking bodies, of the battery pack box body is effectively reduced; furthermore, more battery cell stacking bodies can be arranged in the battery pack box body, and the space utilization rate and the energy density in the battery pack box body are further improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power batteries, and in particular to a battery pack and a battery pack. BACKGROUND

[0002] With the increasing penetration rate of new energy vehicles in the market, commercial vehicles have increasingly high requirements for the endurance mileage of new energy vehicles. In order to meet the power requirements, the battery pack used by the new energy vehicle needs to improve the volume utilization efficiency and energy density to connect more single cells in series in the battery pack.

[0003] However, the applicant finds that in order to meet the large power demand, when a large number of cells are connected in series in the battery pack, more structural parts are needed to fix the cells. At this time, the envelope of the battery pack often needs to be increased, which limits the further improvement of the space utilization efficiency and energy density of the battery pack. CONTENT OF THE UTILITY MODEL

[0004] Therefore, the purpose of the present application is to provide a battery pack and a battery pack to at least partially solve the problem of low space utilization efficiency and energy density of the battery pack caused by the large number of structural parts used to fix the cells in the battery pack.

[0005] To achieve the above purpose, the first aspect of the present application provides a battery pack, comprising: at least two cell stacks; a middle plate connected between adjacent two cell stacks along the stacking direction of the cells in each cell stack, and the middle plate is used to connect with a battery pack box.

[0006] Optionally, the battery pack further comprises a binding belt assembly, the binding belt assembly comprises at least two binding belts, and the cell stack and the middle plate are connected by the at least two binding belts.

[0007] Optionally, the binding belt assembly comprises a first binding belt, and the middle plate and the adjacent cell stack are connected by the first binding belt.

[0008] Optionally, the middle plate is provided with a binding through hole penetrating in a first direction, and the first binding belt passes through the middle plate through the binding through hole; the first direction intersects with the stacking direction of the cells in the cell stack.

[0009] Optionally, the binding through hole is provided with a rounded corner near the hole edge of the cell stack.

[0010] Optionally, the binding through hole is provided with two along the stacking direction of the cells in the cell stack.

[0011] Optionally, the first binding belt is a plastic binding belt.

[0012] Optionally, the middle plate is provided with a first lifting opening at least at the top, and a lifting inner cavity for accommodating at least part of a lifting hook is arranged in the middle plate, and the lifting inner cavity is in communication with the outside through the first lifting opening.

[0013] Optionally, at least one side wall of the middle plate along the stacking direction of the battery cells in the battery cell stack is provided with a second lifting opening, and the second lifting opening is in communication with the lifting inner cavity.

[0014] Optionally, the battery pack is provided with two end plates at two ends along the stacking direction of the battery cells in the battery cell stack, and the binding assembly comprises a second binding band for binding and connecting the two end plates, and the second binding band is used to clamp the battery cell stack and the middle plate between the two end plates.

[0015] Optionally, the battery pack is provided with two battery cell stacks, and the middle plate is bound and connected with the adjacent battery cell stack by a first binding band; the first binding band passes through the middle plate and wraps the battery cell stack on one side of the middle plate and the end plate adjacent to the battery cell stack.

[0016] Optionally, the edge of the end plate in contact with the first binding band or the second binding band is provided with a rounded corner.

[0017] Optionally, the second binding band is a metal binding band.

[0018] Optionally, the top of the middle plate is provided with a fixing hole penetrating through the middle plate, and the fixing hole is used for penetrating a fastener connected with a battery pack box body.

[0019] Optionally, the at least two binding bands are arranged in the height direction of the battery cell stack, and the strength of the binding band located above is greater than that of the binding band located below in the height direction of the battery cell stack.

[0020] Based on the same inventive concept, the second aspect of the present application further provides a battery pack comprising a battery pack box body and a battery pack as described in the first aspect.

[0021] Optionally, the battery pack box body comprises a bottom plate and a bottom beam protruding from the surface of the bottom plate, the battery cell stack is arranged on the bottom plate, and the middle plate is connected to the bottom beam and / or the bottom plate by a fastener.

[0022] As can be seen from the above, the battery pack and the battery pack provided by the application can be connected to the battery pack box through the same middle plate, that is, the cell stack can be connected to the battery pack box through less than the number of middle plates, thereby effectively reducing the space of the battery pack box occupied by the structure other than the cell stack, and further enabling more cell stacks to be arranged in the battery pack box, and further improving the space utilization and energy density of the battery pack box. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the application or the related art, the drawings needed to be used in the embodiments or the related art description will be briefly introduced. Obviously, the drawings in the following description are only embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0024] Figure 1 It is a schematic diagram of the battery pack of the embodiment of the application;

[0025] Figure 2 It is a front view schematic diagram of the battery pack of the embodiment of the application;

[0026] Figure 3 It is Figure 2 It is a sectional view of the middle A-A section;

[0027] Figure 4 It is a schematic diagram of the middle plate of the battery pack of the embodiment of the application.

[0028] Explanation of reference signs:

[0029] 100, battery pack box; 110, bottom plate; 111, bottom beam;

[0030] 200, cell stack; 210, cell;

[0031] 300, middle plate; 310, binding through hole; 320, rounded corner; 330, fixing hole; 340, plug-in slot; 350, first hoisting opening; 360, hoisting inner cavity; 370, second hoisting opening;

[0032] 400, binding assembly; 410, first binding belt; 420, second binding belt; 500, end plate. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the application more clear, the application will be further described in detail below in combination with specific embodiments and with reference to the drawings.

[0034] It should be noted that the relative arrangement of the components, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless otherwise specifically stated.

[0035] It should be understood that the dimensions of the various parts shown in the drawings are chosen for convenience only and are not necessarily to scale.

[0036] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the scope of the application or its application or uses.

[0037] It should be noted that the technical terms or scientific terms used in the embodiments of the present application should be understood as the general meaning understood by those skilled in the art unless otherwise defined. The terms "first", "second", and the like used in the embodiments of the present application do not represent any order, number, or importance, but are only used to distinguish different components. The terms "include" or "contain" and the like mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connected" or "connected" and the like are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right", and the like are only used to represent relative positional relationships, and when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The battery pack includes a battery pack box, and the battery cells are fixed in the battery pack box. In order to keep the battery cells in a preset position in the battery pack box, and to facilitate assembly, a plurality of battery cells can be stacked into a battery cell stack in a preset direction (for example, along the thickness direction of the battery cell), and a circumferential frame structure of the battery cell stack is arranged to form a battery module. Finally, one or at least two battery modules are placed in the battery pack box, and the battery module is fixed in a preset position in the battery pack box by means of the frame structure.

[0039] However, since the frame structure of the battery module occupies a large space in the battery pack box, it will cause low space utilization and energy density in the battery pack box.

[0040] In order to solve the above problems, in some embodiments, the battery cell stack is directly installed in the battery pack box. In order to fix the battery cell stack, a connecting structure is arranged between each battery cell stack and the battery pack box, so as to fix the battery cell stack in a preset position in the battery pack box by means of the connecting structure.

[0041] However, the applicant finds that the connection structure arranged for each cell stack still occupies a large space in the battery pack box, and if the number of connection structures is reduced, more cells can be installed in the battery pack box to further improve the space utilization and energy density in the battery pack box.

[0042] Therefore, the battery pack provided by the embodiments of the present application, Figure 1 a schematic diagram of the battery pack is shown, Figure 2 a front view of the battery pack is shown. As Figure 1 and Figure 2 The battery pack comprises: at least two cell stacks 200; and a middle plate 300 connected between adjacent two cell stacks 200 along the stacking direction of the cells 210 in each cell stack 200, and the middle plate 300 is used to connect with the battery pack box 100.

[0043] For example, the two side plate surfaces of the middle plate 300 along the thickness direction (for example, the X direction in the figure, hereinafter referred to as the second direction) are respectively connected with one cell stack 200. Figure 1

[0044] For example, each cell stack 200 comprises a plurality of cells 210 stacked along the second direction, and the adjacent cells 210 can be connected through an adhesive layer.

[0045] For example, the cell stack 200 and the middle plate 300 can be connected through an adhesive layer or a binding tape.

[0046] For example, the middle plate 300 and the battery pack box 100 can be connected through adhesion, clamping or fasteners.

[0047] During assembly, the middle plate 300 can be connected with the battery pack box 100. Since the adjacent two cell stacks 200 can be connected with the same middle plate 300, when the middle plate 300 is connected with the battery pack box 100, the two cell stacks 200 connected with the middle plate 300 can be connected with the battery pack box 100. At the same time, in the battery pack box 100, the number of middle plates 300 is less than the number of cell stacks 200.

[0048] The battery pack provided by the embodiments of the present application can connect two cell stacks 200 with the same middle plate 300 to the battery pack box 100, that is, the cell stacks 200 can be connected with the battery pack box 100 through a number of middle plates 300 less than the number of cell stacks 200, so as to effectively reduce the space occupied by the structures other than the cell stacks 200 in the battery pack box 100, and further arrange more cell stacks 200 in the battery pack box 100 to further improve the space utilization and energy density in the battery pack box 100. ​

[0049] like Figure 1 In some embodiments, the battery pack also includes a strap assembly 400, which includes at least two types of straps, and the cell stack 200 and the middle plate 300 are connected by the at least two types of straps.

[0050] For example, the strap assembly 400 includes at least two straps made of different materials.

[0051] For example, the strap assembly 400 includes at least two straps with different binding connection methods.

[0052] The cell stack 200 and the middle plate 300 are connected by at least two types of straps. Regardless of the material or binding method of the different straps, different binding forces can be provided for the cell stack 200 and the middle plate 300. The superposition of at least two binding forces can make the cell stack 200 more reliably connected to the middle plate 300.

[0053] like Figure 1 In some embodiments, the strap assembly 400 includes a first strap 410, through which the middle plate 300 is strapped to the adjacent cell stack 200.

[0054] For example, the first strap 410 may be fitted onto the outside of the middle plate 300 or pass through the inside of the middle plate 300.

[0055] For example, the width of the middle plate 300 (along) Figure 1 The dimension in the Y direction is not less than the width of the battery cell 210, so as to avoid frictional damage or crushing damage to the battery cell 210 when the first strap 410 is used for binding.

[0056] The first binding strap 410 reliably connects the middle plate 300 to the adjacent cell stack 200 into a whole, ensuring that the cell stack 200 can be fixed in a preset position within the battery pack housing 100 by the middle plate 300. Simultaneously, binding the cell stack 200 to the middle plate 300 also prevents relative movement between the cells 210 in the cell stack 200 and the middle plate 300 during battery pack assembly and transportation, reducing the relative displacement of the cells 210 and avoiding misalignment of the cells 210 in the cell stack 200.

[0057] Figure 3 Showing Figure 2 A schematic diagram of the cross-section AA in the middle, as shown below. Figure 2 and Figure 3 In some embodiments, the middle plate 300 is provided along a first direction (e.g., Figure 3The first binding belt 410 passes through the bundling through hole 310 in the middle plate 300.

[0058] For example, the first direction can be parallel to the inner bottom surface of the battery pack box 100 (i.e., the surface of the bottom plate 110), or inclined relative to the inner bottom surface of the battery pack box 100.

[0059] The applicant found that if the first binding belt 410 is sleeved on the outer side of the middle plate 300, part of the first binding belt 410 will be located on the surface of the middle plate 300, thereby hindering the connection between the battery cell stack 200 and the surface of the middle plate 300. In order to avoid the above problem, in the embodiment, the bundling through hole 310 is provided on the middle plate 300, and the first binding belt 410 passes through the bundling through hole 310 to pass through the middle plate 300 from the inside along the width direction of the middle plate 300, and no longer passes through the surface of the middle plate 300, so that the battery cell stack 200 can be connected with the surface of the middle plate 300, which helps to improve the connection reliability between the battery cell stack 200 and the middle plate 300. At the same time, it can also avoid damage to the battery cell stack 200 by the first binding belt 410.

[0060] For example, Figure 3 In some embodiments, the edge of the bundling through hole 310 near the battery cell stack 200 is provided with a rounded corner 320.

[0061] For example, the radial cross-sectional shape of the bundling through hole 310 is rectangular.

[0062] For example, the edge of the bundling through hole 310 is provided with a rounded corner 320.

[0063] After the first binding belt 410 is bundled with the middle plate 300 and the battery cell stack 200, it will be attached to the side hole wall of the bundling through hole 310 near the battery cell stack 200. If there is a sharp edge at the hole, the edge may cut or even cut the first binding belt 410, thereby reducing the connection reliability between the battery cell stack 200 and the middle plate 300. In order to avoid the above problem, the edge of the bundling through hole 310 near the battery cell stack 200 is provided with a rounded corner 320 to eliminate the sharp edge, thereby avoiding damage to the first binding belt 410 by the middle plate 300, and thereby ensuring reliable connection between the battery cell stack 200 and the middle plate 300.

[0064] For example, Figure 3 In some embodiments, the bundling through hole 310 is provided with two along the stacking direction of the battery cell 210 in the battery cell stack 200 (such as Figure 3 the X direction in the figure).

[0065] Since the two side plate surfaces of the middle plate 300 are connected with the cell stack 200, each middle plate 300 needs to pass through two first binding belts 410. If the two first binding belts 410 need to pass through the same binding through hole 310, the first binding belt 410 that has been arranged in the binding through hole 310 in advance will hinder the arrangement of the subsequent first binding belt 410, which is prone to cause inconvenience in assembly. In order to avoid the above problem, two binding through holes 310 are arranged in the present embodiment, so that each first binding belt 410 is arranged in the binding through hole 310 in an empty state, which is convenient for arrangement.

[0066] Meanwhile, the arrangement direction of the two binding through holes 310 is the same as the stacking direction of the cells 210 in the cell stack 200, which helps to shorten the distance between the binding through hole 310 and the cell stack 200, reduce the amount of the first binding belt 410, and further help to reduce the preparation cost of the battery pack.

[0067] As shown in FIG. 1, the middle plate 300 is arranged between the two cell stacks 200, and the two cell stacks 200 are connected by the middle plate 300. Figure 4 , Figure 4 As shown in FIG. 1, the middle plate 300 is arranged between the two cell stacks 200, and the two cell stacks 200 are connected by the middle plate 300.

[0068] For example, the middle plate 300 can be provided with a cavity, and one of the cavities or at least two adjacent cavities are connected to form the hoisting inner cavity 360.

[0069] For example, the first hoisting opening 350 is arranged at the center of the middle plate 300, so that the battery pack can be moved stably when the battery pack is hoisted through the middle plate 300.

[0070] For example, the first hoisting opening 350 is a polygonal opening or a circular opening.

[0071] When the battery pack needs to be hoisted, the hook can be driven to pass through the first hoisting opening 350 from the outside into the hoisting inner cavity 360 and hook against the top of the hoisting inner cavity 360, so that the middle plate 300 can be lifted by the hook to move the battery pack upward. In the present embodiment, since the middle plate 300 is connected between the two cell stacks 200, the two cell stacks 200 can be stably lifted with the middle plate 300 by lifting the middle plate 300 in the middle, which is convenient for the transfer of the battery pack. Meanwhile, the hoisting of the middle plate 300 can be realized by arranging the first hoisting opening 350 and the hoisting inner cavity 360 on the middle plate 300, so that the overall structure of the middle plate 300 is relatively simple, which helps to reduce the preparation cost of the middle plate 300.

[0072] As shown in FIG. 1, the middle plate 300 is arranged between the two cell stacks 200, and the two cell stacks 200 are connected by the middle plate 300. Figure 4In some embodiments, at least one side wall of the middle plate 300 along the stacking direction of the battery cells 210 in the battery cell stack 200 is provided with a second lifting opening 370, which is in communication with the lifting inner cavity 360.

[0073] For example, the second lifting opening 370 is close to the first lifting opening 350 along the height direction of the middle plate 300 (i.e. the Z direction in the figure). Figure 4

[0074] In combination with the foregoing, when the material thickness between the top of the lifting inner cavity 360 and the top of the middle plate 300 is small, the top of the middle plate 300 may be deformed during the lifting of the battery pack due to the low strength of the hooking position of the hook.

[0075] To avoid the above problem, the second lifting opening 370 is provided on the side wall of the middle plate 300 in the present embodiment, and part of the hook can pass through the second lifting opening 370 after the hook is inserted into the lifting inner cavity 360. At this time, when the hook lifts the middle plate 300, the hook will abut against the upper side edge of the second lifting opening 370, and the greater the straight-line distance between the upper side edge of the second lifting opening 370 and the top of the middle plate 300, the greater the strength between the two. Since the above distance can be adjusted by the position of the second lifting opening 370, by providing the second lifting opening 370 on the side wall of the middle plate 300, the deformation of the middle plate 300 during lifting can be avoided.

[0076] In some embodiments, the top of the middle plate 300 is provided with a fixing hole 330 penetrating through the middle plate 300. For example, Figure 2 The fixing hole 330 is used for the fastener connected with the battery pack box 100 to pass through.

[0077] For example, at least two fixing holes 330 are spaced apart along the second direction, so that the pressing force of the fastener on the middle plate 300 can be more evenly applied to the middle plate 300.

[0078] For example, the fastener can be a long bolt.

[0079] The fastener is inserted into the fixing hole 330 from the top of the middle plate 300 and passes through the middle plate 300 from the bottom of the middle plate 300, and then connected with the battery pack box 100 below the middle plate 300, so as to realize the connection between the battery pack and the battery pack box 100. By arranging the fixing hole 330 on the top of the middle plate 300, the fastener can be easily installed by the assembly personnel, which helps to reduce the difficulty of fixing the battery pack and facilitate the assembly of the battery pack.

[0080] For example, Figure 2 In some embodiments, along the height direction of the middle plate 300, the top of the middle plate 300 does not exceed the top of the battery cell stack 200.​

[0081] The top of the electric cell 210 is provided with a pole for electrical connection with an external circuit. In order to avoid the middle plate 300 in the battery pack from hindering the connection of the pole with the external circuit, it is necessary to ensure that the top of the middle plate 300 is not higher than the top of the pole, i.e. the top of the middle plate 300 does not exceed the top of the electric cell stack 200, so as to ensure that the electric cell 210 in the electric cell stack 200 can be reliably electrically connected with the external circuit through the pole.

[0082] For example, Figure 1 and Figure 2 In some embodiments, the battery pack is provided with one end plate 500 at each end of the electric cell stack 200 in the stacking direction of the electric cell 210, and the binding assembly 400 includes a second binding belt 420 for binding the two end plates 500 together, the second binding belt 420 being used to clamp the electric cell stack 200 and the middle plate 300 between the two end plates 500.

[0083] For example, the second binding belt 420 can be sleeved outside the end plate 500, or pass through the end plate 500.

[0084] For example, the width of the end plate 500 is not less than the width of the electric cell 210.

[0085] The second binding belt 420 is wound around the two end plates 500 and the electric cell stack 200 and the middle plate 300 between the two end plates 500 from the outside of the end plate 500, so as to achieve the binding connection of the two end plates 500. Under the binding action of the second binding belt 420, the two end plates 500 can clamp the electric cell stack 200 and the middle plate 300 between the two end plates 500, so that the two end plates 500, the electric cell stack 200 and the middle plate 300 are connected into one whole, further ensuring the reliable connection of the electric cell stack 200 and the middle plate 300, ensuring that the electric cell stack 200 can be fixed at a predetermined position in the battery pack box 100 through the middle plate 300, and further avoiding the misalignment of the electric cell 210 in the electric cell stack 200.

[0086] For example, Figure 3 In some embodiments, the edge of the end plate 500 in contact with the first binding belt 410 or the second binding belt 420 is provided with a rounded corner 320.

[0087] The beneficial effects of providing the rounded corner 320 on the end plate 500 are similar to those of providing the rounded corner 320 at the binding through hole 310 of the middle plate 300, which will not be described here again.

[0088] For example, Figure 1 and Figure 2In some embodiments, the battery pack is provided with two cell stack 200; the first band 410 passes through the middle plate 300 and wraps around the cell stack 200 on one side of the middle plate 300 and the end plate 500 adjacent to the cell stack 200.

[0089] Since the surface of the end plate 500 away from the cell stack 200 does not contact the cell stack 200, in order to simplify the structure of the end plate 500, the first band 410 can be wrapped outside the end plate 500. At the same time, if the first band 410 or the second band 420 is provided with a structure for head-to-tail connection, the structure can also be provided outside the end plate 500, on the one hand, facilitating the binding connection of the first band 410 or the second band 420, and on the other hand, it can also avoid the structure causing damage to the cell stack 200.

[0090] In some embodiments, the second band 420 is a metal band.

[0091] In combination Figure 1 It can be known that the second band 420 needs to bind two end plates 500, two cell stacks 200, and the middle plate 300. Therefore, the second band 420 needs to use a metal band with higher tensile strength to enable the second band 420 to withstand greater weight and pressure.

[0092] In some embodiments, the first band 410 is a plastic band.

[0093] In combination Figure 1 It can be known that the first band 410 only needs to bind the middle plate 300, one cell stack 200, and one end plate 500. Therefore, the strength requirement of the first band 410 is lower, and a plastic band with lower cost and easier installation can be used to reduce the preparation cost and assembly difficulty of the battery pack, facilitating mass production.

[0094] In some embodiments, at least two kinds of bands are arranged along the height direction of the cell stack 200, and along the height direction of the cell stack 200, the strength of the band above is greater than that of the band below. For example, the band is two kinds, the band above is a metal band, and the band below is a plastic band. Since the bottom of the cell stack 200 will be glued and connected with the battery pack box 100, the stability of the lower part of the cell stack 200 is better, and the required external binding force is smaller, so a plastic band with smaller strength can be used.

[0095] Based on the same inventive concept, in combination with the description of the battery pack of each of the above embodiments, the present embodiment provides a battery pack having the corresponding technical effects of the battery pack of each of the above embodiments, which will not be described here.

[0096] As Figure 2A battery pack includes a battery pack case 100, and a battery pack as in each of the above embodiments.

[0097] The battery pack case 100 can include a frame structure, and a bottom plate 110 sealing an opening at the bottom of the frame structure. The bottom plate 110 and the frame structure enclose a receiving cavity with an open top, and the battery pack is disposed in the receiving cavity.

[0098] The battery pack case 100 can protect the battery pack disposed therein, and facilitate transportation and installation.

[0099] For example, Figure 2 In some embodiments, the battery pack case 100 includes a bottom plate 110, and a bottom beam 111 protruding from the surface of the bottom plate 110. The cell stack 200 is disposed on the bottom plate 110, and the middle plate 300 is connected to the bottom beam 111 and / or the bottom plate 110 by fasteners.

[0100] For example, the bottom beam 111 can extend in the second direction. When multiple battery packs are disposed in the battery pack case 100, the multiple battery packs can be arranged in the second direction, so that the middle plates 300 of the multiple battery packs can be connected to the same bottom beam 111, which helps to simplify the internal structure of the battery pack case 100.

[0101] For example, Figure 2 And Figure 4 The bottom of the middle plate 300 can be provided with a plug-in slot 340 matched with the bottom beam 111. When the battery pack is in contact with the surface of the bottom plate 110, the bottom beam 111 is inserted into the plug-in slot 340, so that the positioning of the battery pack is achieved by the cooperation of the bottom beam 111 and the middle plate 300.

[0102] For example, the bottom beam 111 and the bottom plate 110 can be connected by welding, bonding, clamping, fasteners, or one-piece forming.

[0103] The bottom plate 110 of the battery pack case 100 is used to reliably support the cell stack 200. The position of the bottom beam 111 on the bottom plate 110 can be designed according to the predetermined position of the battery pack in the battery pack case 100. When the bottom beam 111 is aligned with the middle plate 300, the battery pack is limited in the predetermined position, which helps to reduce the assembly difficulty of the battery pack, improve the assembly efficiency, and facilitate mass production. Then, the fasteners pass through the middle plate 300 from the top and are connected with the bottom plate 100 and / or the bottom beam 111 below the middle plate 300, so as to fix the battery pack in the predetermined position in the battery pack case 100.

[0104] It is noted that some embodiments have been described as to what is presently considered to be a practical application of the present application. Other embodiments are within the scope of the following claims. In some cases, an act or step can be performed in a different order from the order described in the embodiments. Additionally, iterations of a process can not be explicitly shown or described. In certain instances, multitasking and parallel processing can be advantageous. Embodiments of the application will hereafter be described with reference to the drawings, wherein shown are:

[0105] Each of the various embodiments in the present application is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between various embodiments can be mutually referred to.

[0106] The description of the application is given for the sake of example and description only and is not intended to be exhaustive or to limit the application to the precise form disclosed. Numerous modifications and adaptations thereof will be apparent to those skilled in the art without departing from the spirit and scope of the application. The embodiments are chosen and described in order to best explain the principles of the application and its practical application to thereby enable others skilled in the art to best utilize the application in various embodiments and with various modifications as are suited to the particular use contemplated.

[0107] Those of ordinary skill in the art will appreciate that the above discussion of various embodiments is for illustrative purposes only and not intended to limit the scope of the application. The technical features of the above embodiments or between different embodiments can be combined, steps can be implemented in any order, and there are many other changes to the aspects of the embodiments of the application as described above. In order to be brief, they are not provided in detail.

[0108] Although the present application has been described in connection with certain specific embodiments thereof, many modifications, changes, alterations and variations will become apparent to those skilled in the art once they have the benefit of the foregoing description.

[0109] The embodiments of the present application are intended to cover all such modifications, changes, alterations and variations as fall within the scope of the application. Accordingly, any omission, modification, substitution, improvement, etc. made in the spirit and principle 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: At least two battery cells stacked together; The middle plate is connected between two adjacent cell stacks along the stacking direction of the cells in each cell stack, and the middle plate is used to connect to the battery pack housing.

2. The battery pack according to claim 1, characterized in that, It also includes a strapping assembly, which includes at least two types of straps, and the cell stack and the middle plate are bound together by the at least two types of straps.

3. The battery pack according to claim 2, characterized in that, The binding assembly includes a first binding strap, through which the middle plate is bound to the adjacent cell stack.

4. The battery pack according to claim 3, characterized in that, The middle plate is provided with a binding through hole along a first direction, and the first binding strap passes through the binding through hole into the middle plate; the first direction intersects with the stacking direction of the cells in the cell stack.

5. The battery pack according to claim 4, characterized in that, The edge of the binding via near the cell stack is rounded.

6. The battery pack according to claim 4, characterized in that, Two binding vias are provided along the stacking direction of the cells within the cell stack.

7. The battery pack according to claim 3, characterized in that, The first strap is a plastic strap.

8. The battery pack according to claim 1, characterized in that, The middle plate has at least a first lifting opening at the top, and the middle plate has a lifting cavity for accommodating at least part of the lifting hooks. The lifting cavity is connected to the outside through the first lifting opening.

9. The battery pack according to claim 8, characterized in that, At least one sidewall of the middle plate along the stacking direction of the cells in the cell stack body is provided with a second lifting opening, and the second lifting opening communicates with the lifting cavity.

10. The battery pack according to claim 2, characterized in that, The battery pack has an end plate at each end along the stacking direction of the cells in the cell stack body. The binding assembly includes a second binding strap that binds the two end plates together. The second binding strap is used to clamp the cell stack body and the middle plate between the two end plates.

11. The battery pack according to claim 10, characterized in that, The battery pack has two cell stacks. The middle plate is connected to the adjacent cell stack by a first strap. The first strap passes through the middle plate and fits the cell stack on one side of the middle plate and the end plate adjacent to the cell stack.

12. The battery pack according to claim 11, characterized in that, The edge of the end plate that contacts the first or second strap is rounded.

13. The battery pack according to claim 10, characterized in that, The second strap is a metal strap.

14. The battery pack according to claim 1, characterized in that, The top of the middle plate is provided with a fixing hole that passes through the middle plate. The fixing hole is used for fasteners that are connected to the battery pack housing to pass through.

15. The battery pack according to claim 2, characterized in that, The at least two types of straps are distributed along the height direction of the battery cell stack, and the straps located at the top of the battery cell stack have a greater strength than the straps located at the bottom.

16. A battery pack, characterized in that, It includes a battery pack housing and a battery pack as described in any one of claims 1 to 15.

17. The battery pack according to claim 16, characterized in that, The battery pack housing includes a base plate and a bottom beam protruding from the surface of the base plate. The battery cell stack is disposed on the base plate, and the middle plate is connected to the bottom beam and / or the base plate by fasteners.

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