Battery pack

Abstract

The utility model provides a battery pack which comprises a battery pack box body which comprises a bottom plate assembly and a side plate assembly connected to at least one side edge in the circumferential direction of the bottom plate assembly; the battery cell stacking body assemblies are arranged on the bottom plate assembly, each battery cell stacking body assembly comprises a middle plate and at least two battery cell stacking bodies, the at least two battery cell stacking bodies are arranged in the stacking direction of battery cells in the battery cell stacking bodies, and the middle plate is connected between every two adjacent battery cell stacking bodies; and the connecting beams are respectively connected with the respective middle plates of all the battery cell stacking body assemblies, and are connected with the side plate assemblies and / or the bottom plate assemblies. According to the battery pack provided by the invention, the connecting beam can be prepared into a structural part with relatively high rigidity, and the battery cell stacking body assembly is connected to the connecting beam, so that a relatively reliable limiting effect on the battery cell stacking body assembly can be achieved through the connecting beam with a relatively stable structure.

Description

TECHNICAL FIELD

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

[0002] With the increasing penetration rate of new energy vehicles, commercial vehicles have increasingly high requirements for the endurance mileage of new energy vehicles. In the related technology, in order to improve the energy density of the battery pack installed in the new energy vehicle, a plurality of cell stacks can be directly installed in the battery pack box.

[0003] However, during the driving of the vehicle, the battery pack will also be subjected to mechanical vibration and mechanical impact, and then the problem of loose connection between the cell stack and the battery pack box may occur, affecting the stability of the battery pack. UTILITARIAN CONTENT

[0004] Therefore, the purpose of the present application is to provide a battery pack to at least partially solve the problem of loose connection between the cell stack and the battery pack box, thereby improving the stability of the battery pack.

[0005] To achieve the above purpose, the present application provides a battery pack, comprising: a battery pack box comprising a bottom plate assembly and a side plate assembly connected to at least one side edge of the bottom plate assembly in the circumferential direction; a cell stack assembly arranged on the bottom plate assembly, each cell stack assembly comprising a middle plate and at least two cell stacks arranged in the stacking direction of the cells in the cell stack, and the middle plate being connected between the adjacent two cell stacks; and a connecting beam connected to the middle plate of each cell stack assembly respectively, and connected to the side plate assembly and / or the bottom plate assembly.

[0006] Optionally, the extension direction of the connecting beam intersects the stacking direction of the cells in the cell stack.

[0007] Optionally, each middle plate is provided with a beam hole passing through in the extension direction of the connecting beam, and the connecting beam is arranged in the middle plate through the beam hole.

[0008] Optionally, the connecting beam comprises a beam body and a connecting portion connected to the end of the beam body; at least part of the beam body is located in the beam hole in the extension direction of the connecting beam, and at least part of the connecting portion protrudes out of the beam hole and is connected to the side plate assembly.

[0009] Optionally, the height of the beam body is greater than the height of the connecting portion.

[0010] Optionally, the side plate assembly comprises a side plate and a connecting seat, the connecting seat is connected to the side wall of the side plate close to the cell stack assembly, and the connecting beam is connected to the connecting seat.

[0011] Optionally, the battery pack comprises a first fastener, the first fastener passes through the middle plate and the connecting beam from the top of the middle plate, and is connected to the bottom plate assembly, and the upper part of the first fastener abuts against the top of the middle plate.

[0012] Optionally, the battery pack comprises a second fastener, the second fastener passes through the connecting beam and part of the middle plate from the top of the connecting beam, and is connected to the bottom plate assembly, and the upper part of the second fastener abuts against the top of the connecting beam.

[0013] Optionally, the middle plate is provided with a lintel hole, the top of the middle plate is provided with a mounting opening penetrating to the lintel hole, and the second fastener is adapted to be arranged in the lintel hole through the mounting opening.

[0014] Optionally, the battery pack comprises a second fastener, each middle plate is provided with two first fasteners, the two first fasteners are arranged in the extension direction of the connecting beam, and the second fastener is arranged between the two first fasteners.

[0015] Optionally, each cell stack assembly comprises two cell stacks.

[0016] As can be seen from the above, the battery pack provided by the application, the connecting beam can be prepared into a structure with greater rigidity, and the cell stack assembly is connected to the connecting beam, which can play a more reliable limiting role on the cell stack assembly through the connecting beam with relatively stable structure. At the same time, the connecting beam is connected to the side plate assembly or the bottom plate assembly of the battery pack, which can avoid relative movement between the cell stack assembly and the battery pack box body, and ensure that the plurality of cell stacks can be stably limited to the preset position in the battery pack box body.

[0017] In addition, since the cell stack is indirectly connected to the connecting beam through the middle plate, the cells in the cell stack can be effectively protected, which helps to improve the safety and service life of the battery pack. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the application or related art, the following will briefly introduce the drawings needed to be used in the embodiments or related art description. 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.

[0019] Figure 1Part of the battery pack of the embodiment of the present application is shown in the figure;

[0020] Figure 2 Part of the battery pack of the embodiment of the present application is shown in the figure; Figure 1 Enlarged view of part A in the figure;

[0021] Figure 3 Schematic view of the middle plate of the battery pack of the embodiment of the present application is shown in the figure;

[0022] Figure 4 Schematic view of the connection of the middle plate and the connecting beam of the battery pack of the embodiment of the present application is shown in the figure;

[0023] Figure 5 Schematic view of the connecting beam of the battery pack of the embodiment of the present application is shown in the figure;

[0024] Figure 6 Schematic view of the connection of the middle plate and the connecting beam of the battery pack of the embodiment of the present application is shown in the figure;

[0025] Figure 7 Part of the battery pack of the embodiment of the present application is shown in the figure; Figure 6 Schematic view of the section of D-D in the figure;

[0026] Figure 8 Part of the battery pack of the embodiment of the present application is shown in the figure; Figure 1 Schematic view of the section of B-B in the figure;

[0027] Figure 9 Part of the battery pack of the embodiment of the present application is shown in the figure; Figure 1 Schematic view of the section of C-C in the figure.

[0028] Explanation of reference signs:

[0029] 100, battery pack box; 110, bottom plate assembly; 111, bottom plate; 112, bottom beam; 120, side plate assembly; 121, side plate; 122, connecting seat; 130, end plate;

[0030] 200, electric cell stack assembly; 210, electric cell stack; 211, electric cell; 220, middle plate; 221, beam hole; 222, mounting opening; 223, insertion slot; 230, stack end plate;

[0031] 300, connecting beam; 310, beam body; 320, connecting part;

[0032] 400, first fastener;

[0033] 500, second fastener. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present application more clear and explicit, the present application is further described in detail below in combination with specific embodiments and with reference to the drawings.

[0035] It should be noted that: Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components set forth in these embodiments do not limit the scope of the present application.

[0036] Meanwhile, it should be understood that, for the sake of convenience in description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way a limitation on the present application or its application or use.

[0038] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the ordinary meanings understood by those of ordinary skill in the art to which the present application pertains. The "first", "second", and similar terms used in the embodiments of the present application do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "comprising" or "including" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0039] In some embodiments, each battery cell stack 210 is connected with a connection structure member, and the connection structure member is connected to the battery pack box body 100 through bolts. The applicant has found through research that if each battery cell stack 210 is individually connected to the battery pack box body 100 through its respective connection structure member, when the battery pack is subjected to mechanical vibration or mechanical shock, the impact on a single battery cell stack 210 is relatively large, and the original torque of the bolts fixing the connection structure member is likely to attenuate, resulting in a relatively high possibility of connection looseness between the connection structure member and the battery pack box body 100.

[0040] If multiple battery cell stacks 210 are grouped into a whole, due to the relatively large weight of this whole, the impact of mechanical vibration or mechanical shock on it will be correspondingly reduced. At the same time, each connection structure member can play a role in fixing this whole, so the possibility of connection looseness between this whole and the battery pack box body 100 will be reduced.

[0041] In view of this, the embodiments of the present application provide a battery pack. Figure 1 Shows a partial schematic diagram of the battery pack. Figure 2 Shows Figure 1 An enlarged schematic diagram of part A in Figure 1 AndFigure 2 , the battery pack includes: a battery pack housing 100, including a bottom plate assembly 110 and a side plate assembly 120 connected to at least one side edge in the circumferential direction of the bottom plate assembly 110; a battery cell stack assembly 200 disposed on the bottom plate assembly 110, each battery cell stack assembly 200 including a middle plate 220 and at least two battery cell stacks 210, and the at least two battery cell stacks 210 are arranged along the stacking direction of the battery cells 211 in the battery cell stack 210 (such as Figure 1 and Figure 2 the X direction in); the middle plate 220 is connected between two adjacent battery cell stacks 210; a connecting beam 300, which is respectively connected to the middle plates 220 of all the battery cell stack assemblies 200 and is connected to the side plate assembly 120 and / or the bottom plate assembly 110.

[0042] Exemplarily, the same connecting beam 300 can connect one, two or more battery cell stack assemblies 200 along its extending direction (such as Figure 1 and Figure 2 the Y direction in).

[0043] Exemplarily, the side plate assembly 120 can include a side plate 121 in a plate-like structure and a block structure or a beam structure protruding from the surface of the side plate 121, and the connecting beam 300 can be connected to at least one of the side plate 121, the block structure and the beam structure.

[0044] Exemplarily, the bottom plate assembly 110 can include a bottom plate 111 in a plate-like structure and a block structure or a beam structure protruding from the surface of the bottom plate 111, and the connecting beam 300 can be connected to at least one of the bottom plate 111, the block structure and the beam structure.

[0045] Exemplarily, the connecting beam 300 can be connected to the side plate assembly 120 or the bottom plate assembly 110 by means of bonding, plugging, clamping, welding, fastener connection, etc.

[0046] Exemplarily, the connecting beam 300 can be connected to the middle plate 210 by means of bonding, plugging, clamping, welding, fastener connection, etc.

[0047] Exemplarily, there can be two side plate assemblies 120, and the two side plate assemblies 120 can be connected to the opposite side edges in the circumferential direction of the bottom plate assembly 110.

[0048] Exemplarily, the battery pack housing 100 can further include two end plates 130, and the two end plates 130 and the two side plate assemblies 120 enclose to form a frame structure, and the bottom plate assembly 110 seals the lower opening of the frame structure to form a lower box body with an opening at the top.

[0049] Exemplarily, the stacking direction of the battery cells 211 in the battery cell stack 210 is the same as the extending direction of the side plate assembly 120.

[0050] The battery pack provided in the embodiment includes a plurality of cell stack assemblies 200, a plurality of connecting beams 300, and a battery pack box body 100.

[0051] The connection between the middle plate 220 and the cell stack assembly 210, or the connection between the stack end plate 230 and the cell stack assembly 210 can be achieved by means of gluing, binding connection, insertion, clamping or fastener connection.

[0052] The connection between the middle plate 220 and the cell stack assembly 210, or the connection between the stack end plate 230 and the cell stack assembly 210 can be achieved by means of gluing, binding connection, insertion, clamping or fastener connection.

[0053] The connecting beam 300 can be prepared as a structure with relatively large rigidity, and its own structure is relatively stable and not easy to deform. Therefore, the connection of the cell stack assembly 200 provided on the bottom plate assembly 110 and the connecting beam 300 can make the connecting beam 300 play a relatively reliable limiting role on the cell stack assembly 200. At the same time, the connecting beam 300 is connected to the side plate assembly 120 or the bottom plate assembly 110 of the battery pack box body 100, that is, the relative position between the connecting beam 300 and the battery pack box body 100 is fixed, and then the cell stack assembly 200 connected to the connecting beam 300 can also be relatively reliably fixed at the preset position in the battery pack box body 100.

[0054] In order to avoid damage to the cells 211 in the cell stack assembly 210 due to direct contact between the connecting beam 300 and the cells 211 during assembly and use, in the embodiment, the cell stack assembly 210 is indirectly connected to the connecting beam 300 through the middle plate 220, and the connecting beam 300 can not be in direct contact with the cell stack assembly 210 during assembly and use.

[0055] The battery pack provided in the embodiment includes a plurality of cell stack assemblies 200, a plurality of connecting beams 300, and a battery pack box body 100.

[0056] In addition, since the cell stack assembly 210 is indirectly connected to the connecting beam 300 through the middle plate 220, the cells 211 in the cell stack assembly 210 can be effectively protected, which helps to improve the safety and service life of the battery pack.

[0057] As Figure 3 And Figure 4 In some embodiments, the extension direction of the connecting beam 300 intersects the stacking direction of the battery cells 211 in the battery cell stack 210.

[0058] Generally, the dimension along the stacking direction of the battery cells 211 in the battery cell stack 210 is the length of the battery cell stack 210, and the dimension perpendicular to the stacking direction is the width of the battery cell stack 210. The length of the battery cell stack 210 is much greater than the width.

[0059] In the present embodiment, the connecting beam 300 extends along the width direction of the battery cell stack 210, which not only ensures reliable connection between the connecting beam 300 and the battery cell stack assembly 200, but also helps to shorten the extension length of the connecting beam 300, reduce the manufacturing cost of the connecting beam 300, and reduce the internal space of the battery pack case 100 occupied by the connecting beam 300, which helps to improve the space utilization of the battery pack case 100 and further improve the energy density of the battery pack.

[0060] Figure 3 A schematic view of the middle plate 220 is shown, Figure 4 A schematic view of the connection between the middle plate 220 and the connecting beam 300 is shown.

[0061] As Figure 3 And Figure 5 In some embodiments, each middle plate 220 is provided with a beam hole 221 extending through the extension direction of the connecting beam 300, and the connecting beam 300 is arranged through the beam hole 221 of the middle plate 220.

[0062] For example, the radial cross-sectional dimension (including length and width) of the beam hole 221 can be greater than or equal to the corresponding dimension of the radial cross-section of the connecting beam 300. When the radial cross-sectional dimension of the beam hole 221 is larger, it can be convenient for the connecting beam 300 to pass into the beam hole 221, which helps to reduce the assembly difficulty. When the radial cross-sectional dimension of the beam hole 221 is equal to the corresponding dimension of the radial cross-section of the connecting beam 300, the connecting beam 300 can more reliably limit the middle plate 220 from moving relative to the connecting beam 300 along the radial direction of the connecting beam 300.

[0063] For example, at least one dimension (length or width) of the radial cross-section of the beam hole 221 can be equal to the corresponding dimension of the radial cross-section of the connecting beam 300, and the other dimension of the radial cross-section of the beam hole 221 is greater than the corresponding dimension of the radial cross-section of the connecting beam 300.

[0064] For example, the middle plate 220 extends along the width direction (such as the direction of the arrow A in FIG. 4) of the middle plate 220, and the beam hole 221 extends through the width direction of the middle plate 220. Figure 2The middle plate 220 is provided with a through hole in the Y direction (i.e., the direction perpendicular to the X direction) for reducing the weight and material consumption of the middle plate 220. The through hole can be configured as a beam hole 221.

[0065] For example, the radial cross section of the beam hole 221 can be polygonal, such as rectangular or triangular.

[0066] If the connecting beam 300 is connected to the surface of the middle plate 220, the connecting beam 300 completely exposed in the battery pack case 100 will occupy a large amount of internal space of the battery pack case 100, thereby reducing the energy density of the battery pack.

[0067] To improve the energy density of the battery pack, in the present embodiment, the beam hole 221 is provided on the middle plate 220 and extends along the extension direction of the connecting beam 300. The connecting beam 300 can pass through the middle plate 220 from the inside along the width direction of the middle plate 220 through the beam hole 221, so that the part of the connecting beam 300 passing through the middle plate 220 does not occupy additional internal space of the battery pack case 100. The saved space can be used to arrange more battery cells 211, which helps to improve the space utilization of the battery pack case 100.

[0068] Figure 5 The schematic diagram of the connecting beam 300 is shown in FIG. 3. Figure 5 and Figure 2 In some embodiments, the connecting beam 300 includes a beam body 310 and a connecting portion 320 connected to the end of the beam body 310. At least part of the beam body 310 is located in the beam hole 221 along the extension direction of the connecting beam 300, and at least part of the connecting portion 320 extends out of the beam hole 221 and is connected to the side plate assembly 120.

[0069] For example, the end of the beam body 310 can be flush with the side wall of the middle plate 220 adjacent to the side plate assembly 120.

[0070] For example, at least one end of the beam body 310 can extend out of the beam hole 221.

[0071] For example, both ends of the beam body 310 can be located in the beam hole 221.

[0072] For example, the connecting portion 320 can be connected to the beam body 310 by adhesion, insertion, clamping, welding, fastener connection or one-piece forming.

[0073] In this embodiment, at least part of the beam body 310 is located in the lintel hole 221, and the connecting beam 300 can reliably limit the middle plate 220 through this part. The connecting beam 300 is connected with the side plate assembly 120 through the connecting part 320 extending out of the lintel hole 221, so as to ensure that the connecting beam 300 and the battery pack box body 100 can form a relatively reliable connection relationship, and further ensure that the cell stack assembly 200 can be limited to a preset position in the battery pack box body 100 through the connecting beam 300.

[0074] In addition, when both ends of the beam body 310 are also located in the lintel hole 221, the internal space of the battery pack box body 100 occupied by the connecting beam 300 can be further reduced, which helps to further improve the space utilization rate of the battery pack box body 100 and the energy density of the battery pack.

[0075] As Figure 2 In some embodiments, the height of the beam body 310 is greater than the height of the connecting part 320.

[0076] In combination Figure 2 The beam body 310 corresponds to the cell stack assembly 200, in order to make the connecting beam 300 better limit the cell stack assembly 200, it is necessary to ensure that the rigidity of the beam body 310 is large, that is, it is necessary to make the beam body 310 have a large height.

[0077] The main function of the connecting part 320 is to connect the beam body 310 with the side plate assembly 120, so the rigidity requirement of the connecting part 320 is small, and even if its height is small, it can also meet the design requirement. Therefore, in this embodiment, the height of the connecting part 320 is smaller than the height of the beam body 310, which on the one hand helps to reduce the preparation cost of the connecting beam 300, and on the other hand can also reduce the internal space of the battery pack box body 100 occupied by the connecting part 320, and avoid interference between the connecting part 320 and other structural members in the battery pack box body 100.

[0078] As Figure 6 In some embodiments, the side plate assembly 120 includes a side plate 121 and a connecting seat 122, the connecting seat 122 is connected to the side wall of the side plate 121 close to the cell stack assembly 200, and the connecting beam 300 is connected with the connecting seat 122.

[0079] For example, the connecting seat 122 can be connected with the side plate 121 by means of bonding, insertion, clamping, welding, fastener connection or one-piece forming.

[0080] For example, the connecting seat 122 can extend along the stacking direction of the cells 211 in the cell stack 210, or extend along the height direction (such as the Z direction in Figure 7

[0081] ​The connecting beam 300 is connected to the top of the connecting seat 122, so that the connecting seat 122 can support the connecting beam 300 and facilitate the connection of the two.

[0082] The connecting beam 300 can be connected to the connecting seat 122 by fasteners, which facilitates assembly and helps reduce the manufacturing cost of the battery pack.

[0083] In general, the extension direction of the side plate 121 is the same as the length direction of the cell stack 210. As described above, the connecting beam 300 extends in the width direction of the cell stack 210, so that the end of the connecting beam 300 faces the side plate 121 when the connecting beam 300 is connected to the side plate assembly 120. Since the top of the side plate 121 needs to be connected to the upper box body of the battery pack, if the connecting beam 300 is directly connected to the side plate 121, the end of the connecting beam 300 will be connected to the surface of the side plate 121, which is inconvenient for assembly.

[0084] To solve the above problem, the connecting seat 122 is arranged on the side plate 121 and protrudes from the inner surface of the side plate 121, that is, the connecting seat 122 is located inside the battery pack box body 100. The structure and position of the connecting seat 122 can be designed according to the structure and position of the connecting beam 300, which provides a structural basis for facilitating the connection of the connecting beam 300 and the side plate assembly 120.

[0085] Figure 6 A top view of the connection between the middle plate 220 and the connecting beam 300 is shown, Figure 6 A cross-sectional view of the middle D-D section is shown, Figure 7 A cross-sectional view of the middle D-D section is shown.

[0086] As Figure 7 and Figure 7 In some embodiments, the battery pack includes a first fastener 400, the first fastener 400 passes through the middle plate 220 and the connecting beam 300 from the top of the middle plate 220 and is connected to the bottom plate assembly 110, and the upper part of the first fastener 400 abuts the top of the middle plate 220.

[0087] The first fastener 400 can be a long bolt, and the upper part of the first fastener 400 can be a nut of the long bolt.

[0088] The first fastener 400 can be a long bolt, and the upper part of the first fastener 400 can be a nut of the long bolt. Figure 8 The bottom plate assembly 110 includes a bottom plate 111 and a bottom beam 112 protruding from the surface of the bottom plate 111, the cell stack 210 is arranged on the bottom plate 111, and the middle plate 220 can be connected to the bottom beam 112 and / or the bottom plate 111 by the first fastener 400.

[0089] The first fastener 400 can be a long bolt, and the upper part of the first fastener 400 can be a nut of the long bolt. Figure 1When the middle plate 220 is connected with the bottom beam 112, multiple middle plates 220 can be connected to the same bottom beam 112.

[0090] Exemplarily, Figure 4 It is shown that Figure 8 A cross-sectional view of the middle B-B section is shown as Figure 8 and Figure 6 The bottom of the middle plate 220 can be provided with a plug-in slot 223 matched with the bottom beam 112, when the battery cell stack 210 is in surface contact with the bottom plate 111, the bottom beam 112 is inserted into the plug-in slot 223, so as to realize the positioning of the battery cell stack assembly 200 through the cooperation of the bottom beam 112 and the middle plate 220.

[0091] Exemplarily, Figure 7 When the first fastener 400 is connected with the bottom plate assembly 110, the upper part of the first fastener 400 can apply extrusion force to the middle plate 220 due to the abutment with the top of the middle plate 220, so as to make the middle plate 220 keep reliable connection with the bottom plate assembly 110, thereby making the battery cell stack assembly 200 stably and reliably connected with the battery pack box 100.

[0092] Meanwhile, since the first fastener 400 also passes through the connecting beam 300, it can also play a certain limiting role on the connecting beam 300.

[0093] Exemplarily, Figure 9 and Figure 1 In some embodiments, the battery pack comprises a second fastener 500, the second fastener 500 passes through the connecting beam 300 and part of the middle plate 220 from the top of the connecting beam 300, and is connected with the bottom plate assembly 110, the upper part of the second fastener 500 abuts with the top of the connecting beam 300.

[0094] Exemplarily, the structure of the second fastener 500 can be the same as that of the first fastener 400.

[0095] Figure 9 It is shown that Figure 6 A cross-sectional view of the middle C-C section is shown as Figure 9 When the second fastener 500 is connected with the bottom plate assembly 110, the upper part of the second fastener 500 can apply extrusion force to the connecting beam 300 due to the abutment with the top of the connecting beam 300, so as to make the connecting beam 300 keep reliable connection with the bottom plate assembly 110, thereby making the battery cell stack assembly 200 stably and reliably connected with the battery pack box 100.

[0096] Meanwhile, since the second fastener 500 also passes through the middle plate 220, it can also play a certain limiting role on the middle plate 220.

[0097] Exemplarily, Figure 6 and Figure 7In some embodiments, the top of the middle plate 220 is provided with a mounting opening 222 penetrating to the lintel hole 221, and the second fastener 500 is adapted to be arranged in the lintel hole 221 through the mounting opening 222.

[0098] When the second fastener 500 is installed on the connecting beam 300, the assembler can insert the second fastener 500 into the lintel hole 221 through the mounting opening 222, and can observe the position of the second fastener 500 in the lintel hole 221 through the mounting opening 222. The installation tool can also be inserted into the lintel hole 221 through the mounting opening 222 and act on the second fastener 500 to complete the tightening or dismounting work of the second fastener 500. Therefore, by providing the mounting opening 222 on the top of the middle plate 220, the assembly difficulty of the second fastener 500 can be reduced, thereby helping to improve the assembly efficiency of the battery pack and being beneficial to mass production.

[0099] As Figure 2 and ​ In some embodiments, each middle plate 220 is correspondingly provided with two first fasteners 400, and the two first fasteners 400 are arranged in the extension direction of the connecting beam 300 and are spaced apart, and the second fastener 500 is arranged between the two first fasteners 400.

[0100] Since the weight of the cell stack assembly 200 is large, a large number of first fasteners 400 need to be arranged to ensure the reliable connection between the cell stack assembly 200 and the battery pack box body 100. At the same time, the two first fasteners 400 can also provide a relatively uniform force to the middle plate 220.

[0101] Since the weight of the connecting beam 300 is small, even if the number of the second fasteners 500 is small, the reliable connection between the connecting beam 300 and the battery pack box body 100 can be ensured. At the same time, the second fastener 500 is arranged between the two first fasteners 400, which can make the two kinds of fasteners distributed more uniformly and reasonably on the middle plate 220.

[0102] As ​ In some embodiments, each cell stack assembly 200 includes two cell stack assemblies 210.

[0103] In the cell stack assembly 200, if multiple cell stack assemblies 210 are arranged in the same cell stack assembly 200, although the dislocation distance between the adjacent cell stack assemblies 210 is small after the cell stack assembly 200 is impacted, the dislocation distance will be accumulated from the first cell stack assembly 210 to the last cell stack assembly 210, that is, the dislocation distance of the first cell stack assembly 210 relative to the last cell stack assembly 210 can be large.

[0104] Therefore, the embodiment is configured to avoid the above-mentioned situation, and each battery cell stack assembly 200 includes two battery cell stacks 210, which helps to ensure that each battery cell stack 210 can be better defined in the preset position in the battery pack box 100.

[0105] 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 acts or steps recited in the claims can be performed in a different order and still accomplish desirable results. Also, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve desirable results. In certain implementations, multitasking and parallel processing can be advantageous.

[0106] Each embodiment in the present application is described in a progressive manner, and each embodiment focuses on the difference from other embodiments. The same or similar parts between each embodiment can be referred to each other.

[0107] 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 will be apparent to those of ordinary skill in the art. Embodiments are chosen and described in order to best explain the principles of the present application and its practical application, and to enable others skilled in the art to understand the present application for various embodiments with various modifications as are suited to the particular use contemplated.

[0108] Those of ordinary skill in the art will understand that the above discussion of any embodiment is merely exemplary and is not intended to suggest that the scope of the present application is limited to these examples; the above embodiments or technical features among different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the aspects of the embodiments of the present application as described above, which are not provided in detail. In order to be brief, they are not provided in detail.

[0109] Although the present application has been described in conjunction with the specific embodiments thereof, it is to be understood that many alternatives, modifications and variations will be apparent to those skilled in the art in light of the foregoing description.

[0110] Embodiments of the present application are intended to cover all such alternatives, modifications and variations as falling within the scope of the present application. Accordingly, any omission, modification, equivalent replacement, improvement, etc. made within the spirit and principle of the embodiments of the present application shall be included in the protection scope of the present application.

Claims

1. A battery pack, characterized in that, include: The battery pack housing includes a base plate assembly and a side plate assembly connected to at least one edge of the base plate assembly in the circumferential direction; A cell stack assembly is disposed on the base plate assembly. Each cell stack assembly includes a middle plate and at least two cell stacks. The at least two cell stacks are arranged along the stacking direction of the cells in the cell stack. The middle plate is connected between two adjacent cell stacks. The connecting beams are respectively connected to the middle plates of all the cell stack assemblies, and to the side plate assemblies and / or the bottom plate assemblies.

2. The battery pack according to claim 1, characterized in that, The extension direction of the connecting beam intersects with the stacking direction of the cells within the cell stack.

3. The battery pack according to claim 1, characterized in that, Each of the middle plates is provided with a through hole extending along the extension direction of the connecting beam, and the connecting beam passes through the through hole into the middle plate.

4. The battery pack according to claim 3, characterized in that, The connecting beam includes a beam body and a connecting portion connected to the end of the beam body; along the extension direction of the connecting beam, at least a portion of the beam body is located within the lintel hole, and at least a portion of the connecting portion extends out of the lintel hole and is connected to the side plate assembly.

5. The battery pack according to claim 4, characterized in that, The height of the main beam is greater than the height of the connecting part.

6. The battery pack according to claim 1, characterized in that, The side plate assembly includes a side plate and a connecting seat, the connecting seat being connected to the side wall of the side plate near the cell stack assembly, and the connecting beam being connected to the connecting seat.

7. The battery pack according to claim 1, characterized in that, The battery pack includes a first fastener that passes through the top of the middle plate and the connecting beam, and is connected to the bottom plate assembly, with the upper part of the first fastener abutting against the top of the middle plate.

8. The battery pack according to claim 1, characterized in that, The battery pack includes a second fastener that passes through the top of the connecting beam and a portion of the middle plate and is connected to the bottom plate assembly, with the upper part of the second fastener abutting against the top of the connecting beam.

9. The battery pack according to claim 8, characterized in that, The middle plate is provided with a beam hole, and the top of the middle plate is provided with an installation opening that extends through the beam hole. The second fastener is adapted to be installed in the beam hole through the installation opening.

10. The battery pack according to claim 7, characterized in that, The battery pack includes a second fastener, and each middle plate is provided with two first fasteners. The two first fasteners are spaced apart along the extension direction of the connecting beam, and the second fastener is disposed between the two first fasteners.

11. The battery pack according to claim 1, characterized in that, Each of the cell stack assemblies comprises two cell stacks.

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