A battery system

Abstract

The application discloses a battery system, comprising a hollow battery box and a battery stack; the battery box comprises an upper box, a lower box, a first intermediate beam and a second intermediate beam; the upper box and the lower box are buckled one above the other; the inner cavity of the lower box comprises front and rear distributed and communicated electrical component mounting cavities and battery mounting cavities; the bottom of the battery mounting cavities is provided with the second intermediate beam and the first intermediate beam; the middle part of the first intermediate beam is perpendicularly crossed and connected with the middle part of the second intermediate beam; the first intermediate beam and the second intermediate beam are used for dividing the battery mounting cavities into four battery mounting spaces; one battery stack is arranged in each battery mounting space; each battery stack comprises a plurality of battery monomers. Through optimization design of the internal structure of the box, the battery system can omit the end plate component of the existing battery module under the premise of ensuring stable and reliable installation of the battery monomers, and significantly improve the box space utilization and energy density of the battery system.

Description

Technical Field

[0001] This invention relates to the field of power lithium-ion battery assembly (PACK) technology, and in particular to a battery system. Background Technology

[0002] Lithium-ion batteries have advantages such as high specific energy, high cycle life, and long storage time. They are widely used not only in portable electronic devices (such as mobile phones, digital cameras, and laptops), but also in large and medium-sized electric equipment such as electric vehicles, electric bicycles, and power tools.

[0003] Currently, with the development of the new energy industry, power lithium-ion battery systems are becoming increasingly modularized, optimizing the process from cell to battery pack (i.e., battery system) and improving the energy density of the battery system.

[0004] However, current CTP (Cell to Pack) assembly solutions for battery systems all contain end-plate structures. This means that during battery system assembly, the battery system still needs to be assembled into battery modules outside the battery box first, and then hoisted into the battery box for installation. Since it is impossible to achieve module-free assembly, it is severely restricted in terms of space utilization, thus seriously affecting the further improvement of battery system energy density. Summary of the Invention

[0005] The purpose of this invention is to provide a battery system that addresses the technical deficiencies of existing technologies.

[0006] Therefore, the present invention provides a battery system comprising a hollow battery housing and a battery stack;

[0007] The battery housing includes an upper housing, a lower housing, a first intermediate beam, and a second intermediate beam;

[0008] The upper and lower boxes are snapped together.

[0009] The inner cavity of the lower housing includes electrical component mounting cavities and battery mounting cavities that are distributed front to back and interconnected;

[0010] At the bottom of the battery mounting cavity, a second intermediate beam distributed laterally and a first intermediate beam distributed longitudinally are fixedly installed.

[0011] The middle part of the first intermediate beam is perpendicularly and intersectingly fixedly connected to the middle part of the second intermediate beam.

[0012] The first and second intermediate beams are used to divide the battery mounting cavity into four battery mounting spaces.

[0013] Each battery installation space contains a battery stack.

[0014] Each battery stack comprises multiple individual battery cells arranged longitudinally and side by side;

[0015] The second intermediate beam is used to embed the lower part of the battery cell in the battery stack;

[0016] The first intermediate beam includes a fixing part;

[0017] A first groove with an opening facing downwards is provided at the bottom center of the fixing part;

[0018] The second intermediate beam includes a fixed component distributed laterally and multiple positioning components distributed longitudinally;

[0019] The fixing component and the positioning component are fixedly connected;

[0020] The fixing component includes multiple laterally distributed first fixing component sub-parts and one laterally distributed second fixing component sub-part;

[0021] The second sub-part of the fixing component is located in the middle of the multiple first sub-parts of the fixing components;

[0022] The second sub-part of the fixing member is connected to the first sub-parts of the two fixing members located on its left and right sides;

[0023] A second groove with an upward opening is provided at the top transverse middle position of the second sub-part of the fixing component;

[0024] The first groove on the fixing part of the first intermediate beam is perpendicularly intersected with the second groove and welded or fixedly connected by bolts.

[0025] Preferably, for each battery stack, end foam is provided on its left and right sides by means of adhesive bonding.

[0026] Preferably, the first intermediate beam further includes a connecting portion;

[0027] The connecting part is located on the front side of the fixed part;

[0028] The connecting part and the fixing part are integrally formed;

[0029] The connecting part is located in the cavity where the electrical components are installed;

[0030] The front side of the connecting part is fixedly connected to the front side of the electrical component mounting cavity.

[0031] Preferably, the lower parts of the first sub-parts of any two adjacent fixed components are connected by a positioning connection part;

[0032] The lower part of the second sub-part of the fixing member is also connected to the lower part of the first sub-part of the adjacent fixing member through a positioning connection part;

[0033] For the fixed component, it has a first positioning groove directly above each positioning connection part;

[0034] For fixed components, a second positioning groove is provided at the top right end of the first sub-part of each fixed component.

[0035] Preferably, each positioning component includes a positioning vertical plate;

[0036] On the lower front and rear sides of the vertical plate of the positioning part, there is a longitudinally distributed horizontal plate of the positioning part;

[0037] The lower part of each positioning part vertical plate is provided with a positioning connection part receiving groove with an opening facing downward;

[0038] The upper part of each positioning part is located in the first positioning groove in the fixing component of the second intermediate beam;

[0039] Each positioning connection groove contains a positioning connection from a fixing component, which is embedded from bottom to top.

[0040] The top of each positioning section vertical plate has a first positioning mounting section that bends horizontally to the left;

[0041] Each first positioning mounting part is located in a second positioning groove provided on the top of a first sub-part of a fixing member of a fixing member;

[0042] At the outer ends of the two horizontal positioning plates, which are far from the vertical positioning plates, there is a battery positioning part that bends to the left.

[0043] The longitudinal gap between each battery positioning part and the fixing member is used to embed the lower part of one of the battery cells in the battery stack from top to bottom.

[0044] Preferably, for a battery stack, a loop is provided between any two adjacent battery cells;

[0045] The loop frame is located on top of the horizontal plate of the positioning part in the positioning component of the second intermediate beam.

[0046] Preferably, a bottom insulating sheet is adhered to the bottom inner side of the lower housing, directly below each battery stack.

[0047] Preferably, a side insulating sheet is provided between the electrical component mounting cavity and the adjacent battery stack;

[0048] Side insulating sheets are bonded to the sidewalls of the battery stack facing the electrical component mounting cavity.

[0049] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a battery system with a scientific structural design. By optimizing the internal structure of its housing, it can omit (i.e. remove) the end plate components in the existing battery module while ensuring the stable and reliable installation of the battery cells, thereby achieving a module-free design. This significantly improves the utilization rate of the battery system's housing space and thus improves the energy density of the battery system, which has significant practical implications.

[0050] By applying the structural design of this invention, the assembly steps of the battery system and the transfer time during battery system assembly can be simplified, thereby further improving the production efficiency of the battery system. Attached Figure Description

[0051] Figure 1 A schematic diagram of the external structure of a battery system provided by the present invention;

[0052] Figure 2 This is a schematic diagram of the internal assembly of a battery system provided by the present invention. At this time, the upper housing has been removed, and a battery stack has also been removed. The figure shows three battery stacks.

[0053] Figure 3 A three-dimensional structural diagram of the assembled state of the second intermediate beam in a battery system provided by the present invention;

[0054] Figure 4 A schematic diagram of a positioning component in a battery system provided by the present invention;

[0055] Figure 5 A schematic diagram of the fixing component of the second intermediate beam in a battery system provided by the present invention;

[0056] Figure 6 For along Figure 5 A cross-sectional view of line AA shown;

[0057] Figure 7 A schematic diagram of the structure of the first intermediate beam in a battery system provided by the present invention;

[0058] Figure 8 A three-dimensional exploded disassembly diagram of a battery stack in a battery system provided by the present invention;

[0059] Figure 9 A schematic diagram showing the installation positions of some individual cells in a battery stack and the battery positioning part in a second intermediate beam in a battery system provided by the present invention.

[0060] Figure 10 This invention provides a schematic diagram of the structure of a single battery cell included in a battery stack.

[0061] In the diagram, 1 is the upper cover, 2 is the lower casing, 3 is the battery stack, 31 is the end foam, 32 is the individual battery cell, 33 is the U-shaped frame, and 34 is the busbar.

[0062] 4. First intermediate beam; 41. First groove; 42. Fixing part; 43. Connecting part;

[0063] 5. Second intermediate beam; 51. Positioning component;

[0064] 511. Battery positioning part; 512. Positioning connection part receiving groove; 513. First positioning mounting part; 52. Fixing component; 5211. First positioning groove; 5212. Second positioning groove; 522. Second groove; 6. Bottom insulating sheet; 7. Side insulating sheet. Detailed Implementation

[0065] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0066] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0067] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0068] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0069] See Figures 1 to 10 This invention provides a battery system with an optimized housing structure, eliminating the need for traditional battery module end plate components. During installation, the battery cells are directly installed into the lower housing according to the positioning structure within the housing, thus completing the battery system assembly.

[0070] The battery system provided by the present invention specifically includes a hollow battery housing and a battery stack 3;

[0071] The battery box includes an upper box 1, a lower box 2, a first intermediate beam 4, and a second intermediate beam 5.

[0072] The upper box 1 and the lower box 2 are fastened together.

[0073] The inner cavity of the lower housing 2 includes an electrical component mounting cavity 201 and a battery mounting cavity 202 that are distributed front to back and interconnected.

[0074] At the bottom of the battery mounting cavity 202, a second intermediate beam 5 distributed laterally and a first intermediate beam 4 distributed longitudinally are fixedly installed.

[0075] The middle part of the first intermediate beam 4 is perpendicularly and fixedly connected to the middle part of the second intermediate beam 5.

[0076] The first intermediate beam 4 and the second intermediate beam 5 are used to divide the battery mounting cavity 202 into four battery mounting spaces.

[0077] Each battery installation space is equipped with a battery stack 3;

[0078] Each battery stack 3 includes multiple battery cells 32 that are longitudinally distributed and arranged side by side;

[0079] The second intermediate beam 5 is used to embed (embed from top to bottom) the lower part of the battery cell 32 in the battery stack 3.

[0080] In this invention, specifically, for each battery stack 3, end foam 31 is provided on its left and right sides by means of adhesive bonding.

[0081] The end foam 31 is located between the battery cell 32 and the left and right inner walls of the lower housing 2, or between the battery cell 32 and the first intermediate beam 4.

[0082] It should be noted that in this invention, the battery stack 3 is stacked along the width direction of the battery (i.e., laterally) and is fixedly constrained to the top of the lower housing 2 by the first positioning part 511 and the second positioning part 514 of the second intermediate beam 5.

[0083] In this invention, each battery stack 3 includes multiple battery cells 32, multiple U-shaped pads 33, and two end foams 31. The end foams, battery cells, and U-shaped pads are stacked sequentially into the lower housing 2 along the transverse direction of the second intermediate beam 5.

[0084] It should be noted that in this invention, the upper housing 1 is a sheet metal structure, and the lower housing 2 is connected to the first intermediate beam 4 and the second intermediate beam 5, thereby forming a cavity that can accommodate the installation of battery cells.

[0085] In this invention, for specific implementation, see [link to relevant documentation]. Figure 7 The first intermediate beam 4 includes a fixing part 42;

[0086] A first groove 41 with an opening facing downward is provided at the bottom center of the fixing part 42;

[0087] The fixing part 42 is used to support the adjacent battery stack 3;

[0088] In specific implementation, the first intermediate beam 4 also includes a connecting part 43;

[0089] The connecting part 43 is located on the front side of the fixing part 42;

[0090] The connecting part 43 and the fixing part 42 are integrally formed;

[0091] The connecting part 43 is located in the electrical component mounting cavity 201;

[0092] The front side of the connecting part 43 is fixedly connected to the front side of the electrical component mounting cavity 201 (e.g., by bolts).

[0093] It should be noted that the electrical component mounting cavity 201 is used to install existing electrical components such as the power terminals of the battery system.

[0094] In this invention, for specific implementation, see [link to relevant documentation]. Figure 3 The second intermediate beam 5 includes a horizontally distributed fixing member 52 and multiple longitudinally distributed positioning members 51;

[0095] The fixing member 52 is fixedly connected to the positioning member 51 (e.g., by welding or bolting).

[0096] It should be noted that in this invention, the second intermediate beam 5 includes two parts: a fixing member 52 and a positioning member 51. The fixing member and the positioning member are fixedly connected by welding or bolts, but the connection method is not limited to these two.

[0097] In this invention, for specific implementation, see [link to relevant documentation]. Figure 5 As shown, the fixing member 52 includes a plurality of laterally distributed first fixing member sub-parts 5201 and a laterally distributed second fixing member sub-part 5202.

[0098] The second sub-part 5202 of the fixing member is located in the middle of the multiple first sub-parts 5201 of the fixing members;

[0099] The second sub-part 5202 of the fixing member is connected to the first sub-parts 5201 of the two fixing members located on its left and right sides;

[0100] A second groove 522 with an upward opening is provided at the top transverse middle position of the second sub-part 5202 of the fixing member;

[0101] See also Figure 7 As shown, the first groove 41 on the fixing part 42 of the first intermediate beam 4 is perpendicularly intersected with the second groove 522 and welded together or fixed by bolts.

[0102] It should be noted that, in this invention, the first intermediate beam 4 and the second intermediate beam 5 are spliced ​​together by the first groove 41 and the second groove 522, and then welded or bolted together. Then the first intermediate beam 4 and the second intermediate beam 5 are welded or bolted together and fixed to the bottom of the lower box 2. The above connection method is not limited to welding and bolting.

[0103] In a specific implementation, the lower parts of any two adjacent fixed components' first sub-parts 520 are connected by a positioning connection part 5213 (e.g., by welding or integral molding connection).

[0104] The lower part of the second sub-part 5202 of the fixing member is also connected to the lower part of the first sub-part 5201 of the adjacent fixing member through a positioning connection part 5213 (e.g., by welding or integral molding connection).

[0105] For specific implementation details, please refer to [link / reference]. Figure 6 As shown, for the fixing member 52, it has a first positioning groove 5211 directly above each positioning connection part 5213;

[0106] For the fixing member 52, a second positioning groove 5212 is provided at the top right end of the first sub-part 520 of each fixing member.

[0107] In this invention, for specific implementation, see [link to relevant documentation]. Figure 4 As shown, each positioning component 51 includes a positioning vertical plate 5101;

[0108] On the lower front and rear sides of the vertical plate 5101 of the positioning part, there is a longitudinally distributed horizontal plate 5102 of the positioning part.

[0109] The lower part of each positioning part vertical plate 5101 is provided with a positioning connection part receiving groove 512 with an opening facing downward;

[0110] The upper part of each positioning part vertical plate 5101 is located in the first positioning groove 5211 in the fixing member 52 of the second intermediate beam 5;

[0111] Each positioning connection portion receiving groove 512 has a positioning connection portion 5213 embedded from bottom to top in a fixing member 52;

[0112] The top of each positioning section vertical plate 5101 has a first positioning mounting section 513 that bends horizontally to the left.

[0113] Each first positioning mounting part 513 is located in a second positioning groove 5212 provided on the top of a first sub-part 520 of a fixing member 52;

[0114] Each of the two horizontal positioning plates 5102 has a battery positioning part 511 (serving as the end face positioning part of the battery) that bends to the left at its outer end away from the vertical positioning plate 5101.

[0115] The longitudinal gap between each battery positioning part 511 and the fixing member 52 is used to embed (embed from top to bottom) the lower part of one of the battery cells 32 in the battery stack 3.

[0116] It should be noted that, in this invention, when the longitudinal gap between each battery positioning part 511 and the fixing member 52 is embedded in the lower part of a battery cell 32, the horizontal plate 5102 of the positioning part can position and constrain the side of the battery cell 32, and the battery positioning part 511 and the fixing member 52 together can position and constrain the front and rear end faces of the battery cell 32.

[0117] For specific implementation details, see [link / reference] Figure 8 , Figure 9 For the battery stack 3, there is a loop-shaped frame 33 (i.e., a loop-shaped spacer) between any two adjacent battery cells 32;

[0118] The loop frame 33 is located on top of the positioning part horizontal plate 5102 in the positioning member 51 of the second intermediate beam 5.

[0119] In this invention, for specific implementation, see [link to relevant documentation]. Figure 2As shown, on the bottom inner side of the lower housing 2, directly below each battery stack 3, a bottom insulating sheet 6 (the insulating sheet can be made of polycarbonate PC sheet) is respectively attached.

[0120] In this invention, specifically, a side insulating sheet 7 (which can be a polycarbonate PC sheet) is provided between the electrical component mounting cavity 201 and the adjacent battery stack 3.

[0121] Side insulating sheet 7 is bonded to the side wall of the battery stack 3 facing the electrical component mounting cavity 201.

[0122] In this invention, specifically, the battery stack 3 includes multiple battery cells 32, which are connected in series and / or in parallel through multiple busbars 34 (specifically, the terminals on adjacent battery cells are connected through busbars).

[0123] To better understand the technical solution of the present invention, the assembly process of the present invention is described below.

[0124] The first step is to assemble the lower casing.

[0125] The lower housing includes a lower housing 2, a first intermediate beam 4, and a second intermediate beam 5. First, the fixing member 52 of the second intermediate beam 5 is installed at the center along the width direction (i.e., longitudinal direction) of the housing. Then, the first intermediate beam 4 is fitted with the second groove 522 in the fixing member 52 of the second intermediate beam 5 via the first groove 41, and then installed in the lower housing 2. Simultaneously, in the four spaces formed by the intersection of the first intermediate beam 4 and the second intermediate beam 5, according to... Figure 2 The bottom insulating sheet 6 is pasted at the indicated positions. Finally, the positioning component 51 of the second intermediate beam 5 is connected to the second positioning groove 5212 and positioning connection part 5213 in the fixing component 52 of the second intermediate beam 5 through the first positioning mounting part 513 and the positioning connection part receiving groove 512, respectively, thus completing the installation of the lower box part.

[0126] The second step is to stack the battery cells onto the lower housing.

[0127] First, the end foam 31 is bonded to the end battery cell 32. Then, the end face and side of the battery cell 32 are installed to the lower housing by cooperating with the positioning part horizontal plate 5102 and the battery positioning part 511 in the positioning member 51 of the second intermediate beam 5. Next, the middle battery cell has a U-shaped frame 33 glued to one side, following the same procedure as the end battery cell. (See below) Figure 9 Install at the indicated positions. In the completed four-part cell stack, install according to... Figure 2 Attach the side insulating sheet 7 to the indicated location.

[0128] Finally, the upper and lower housing parts are assembled according to... Figure 1 Install as shown to complete the assembly of the entire battery system.

[0129] In summary, compared with the prior art, the battery system provided by this invention has a scientific structural design. By optimizing the internal structure of its housing, it can omit (i.e. remove) the end plate components in the existing battery module while ensuring the stable and reliable installation of the battery cells, thus achieving a module-free design. This significantly improves the utilization rate of the battery system's housing space and thereby increases the energy density of the battery system, which has significant practical implications.

[0130] By applying the structural design of this invention, the assembly steps of the battery system and the transfer time during battery system assembly can be simplified, thereby further improving the production efficiency of the battery system.

[0131] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery system, characterized in that, The battery includes a hollow battery housing and a battery stack (3); the battery housing includes an upper housing (1), a lower housing (2), a first intermediate beam (4), and a second intermediate beam (5); the upper housing (1) and the lower housing (2) are fastened together; the inner cavity of the lower housing (2) includes an electrical component mounting cavity (201) and a battery mounting cavity (202) that are distributed front to back and interconnected; at the bottom of the battery mounting cavity (202), a second intermediate beam (5) distributed laterally and a first intermediate beam (4) distributed longitudinally are fixedly provided; the middle part of the first intermediate beam (4) is perpendicularly and intersectingly fixedly connected to the middle part of the second intermediate beam (5); the first intermediate beam (4) and the second intermediate beam (5) are used to divide the battery mounting cavity (202) into four battery mounting spaces; each battery mounting space is provided with a battery stack (3); each battery stack (3) includes multiple battery cells (32) arranged longitudinally and side by side; the second intermediate beam (5) is used to embed the lower part of the battery cells (32) in the battery stack (3); the first intermediate beam (4) includes a fixing part (42); the bottom middle position of the fixing part (42) is provided with a first groove (41) with an opening facing downward; the second intermediate beam (5) includes a fixing member (52) arranged laterally and multiple A longitudinally distributed positioning member (51); a fixing member (52) is fixedly connected to the positioning member (51); the fixing member (52) includes multiple laterally distributed first fixing member sub-parts (5201) and a laterally distributed second fixing member sub-part (5202); the second fixing member sub-part (5202) is located in the middle of the multiple first fixing member sub-parts (5201); the second fixing member sub-part (5202) is connected to two first fixing member sub-parts (5201) located on its left and right sides; a second groove (522) with an upward opening is provided at the middle of the top of the second fixing member sub-part (5202); the first The first groove (41) on the fixing part (42) of the intermediate beam (4) is perpendicularly spliced ​​with the second groove (522) and welded or fixedly connected by bolts; for each battery stack (3), end foam (31) is provided on its left and right sides by adhesive bonding; the first intermediate beam (4) also includes a connecting part (43); the connecting part (43) is located on the front side of the fixing part (42); the connecting part (43) and the fixing part (42) are integrally formed; the connecting part (43) is located in the electrical component mounting cavity (201); the front side of the connecting part (43) is fixedly connected to the front side of the electrical component mounting cavity (201).

2. The battery system as claimed in claim 1, characterized in that, The lower parts of any two adjacent first sub-parts (5201) of the fixing member are connected by a positioning connection part (5213); the lower part of the second sub-part (5202) of the fixing member is also connected to the lower part of the adjacent first sub-part (5201) of the fixing member by a positioning connection part (5213); for the fixing member (52), it has a first positioning groove (5211) directly above each positioning connection part (5213); for the fixing member (52), a second positioning groove (5212) is respectively provided at the top right end of each first sub-part (5201) of the fixing member (52).

3. The battery system as described in claim 2, characterized in that, Each positioning component (51) includes a positioning vertical plate (5101); a longitudinally distributed positioning horizontal plate (5102) is provided on the lower front and rear sides of the positioning vertical plate (5101); and a positioning connection receiving groove (512) with an opening facing downward is provided on the lower part of each positioning vertical plate (5101). The upper part of each positioning vertical plate (5101) is located in the first positioning groove (5211) in the fixing member (52) of the second intermediate beam (5); each positioning connection receiving groove (512) has a positioning connection (5213) in the fixing member (52) embedded from bottom to top; the top of each positioning vertical plate (5101) has a first positioning mounting part (513) that bends horizontally to the left. Each first positioning mounting part (513) is located in a second positioning groove (5212) provided on the top of a first sub-part (520) of a fixing member (52); two positioning part horizontal plates (5102) are provided with a left-bent battery positioning part (511) at the outer end away from the positioning part vertical plate (5101); the longitudinal gap between each battery positioning part (511) and the fixing member (52) is used to embed the lower part of a battery cell (32) in the battery stack (3) from top to bottom.

4. The battery system as claimed in claim 1, characterized in that, For the battery stack (3), there is a loop frame (33) between any two adjacent battery cells (32); the loop frame (33) is located on the top of the positioning part horizontal plate (5102) in the positioning member (51) of the second intermediate beam (5).

5. The battery system as claimed in claim 1, characterized in that, Bottom insulating sheet (6) is attached to the inner side of the bottom of the lower housing (2), directly below each battery stack (3).

6. The battery system as claimed in any one of claims 1 to 5, characterized in that, A side insulating sheet (7) is provided between the electrical component mounting cavity (201) and the adjacent battery stack (3); the side insulating sheet (7) is bonded to the side wall of the battery stack (3) facing the electrical component mounting cavity (201).

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