A battery module

Abstract

The application discloses a novel battery module, comprising a first sub-module and a second sub-module; the first sub-module and the second sub-module each comprise a plurality of battery monomers; the left and right sides of the first sub-module are respectively provided with a front end plate and an end plate first component; the left and right sides of the second sub-module are respectively provided with an end plate second component and a rear end plate; the bottom of the first sub-module and the bottom of the second sub-module are each adhered to the bottom of a battery module box body located outside through a transversely distributed strip-shaped adhesive; the end plate first component and the end plate second component are inserted; a reserved gap is formed between the opposite sides of the end plate first component and the end plate second component. The novel battery module has a scientific structure design, the separated middle end plate structure is added in the middle of the module, the battery module is convenient to disassemble, the problem that the module is difficult to disassemble and repair in the prior art is solved, meanwhile, a structure capable of absorbing the expansion force of the battery module is designed, and the cycle performance of the battery module is improved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a novel battery module. 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. Therefore, the performance requirements for lithium-ion batteries are becoming increasingly stringent.

[0003] With the development of the new energy industry, the shipment volume of battery modules (i.e., battery packs) has been increasing year by year. Under this situation, the repair and replacement of battery modules has gradually gained attention. Currently, because most battery modules are assembled by applying glue to the bottom before connecting them to the bottom of the battery module housing, it is impossible to repair the battery module. The only solution is to replace the entire battery module, which significantly increases the maintenance costs for users.

[0004] Therefore, there is an urgent need to develop a technology that can solve the above-mentioned technical problems. Summary of the Invention

[0005] The purpose of this invention is to provide a novel battery module to address the technical deficiencies of existing technologies.

[0006] Therefore, the present invention provides a novel battery module, which includes a battery module body;

[0007] The battery module body includes a first sub-module and a second sub-module;

[0008] The first sub-module and the second sub-module each include multiple battery cells arranged in parallel.

[0009] The first sub-module has a front end plate and an end plate first component on its left and right sides, respectively.

[0010] The second sub-module has a second end plate component and a rear end plate on its left and right sides, respectively.

[0011] An end plate insulating sheet is provided between the front end plate and the adjacent battery cell, and between the rear end plate and the adjacent battery cell.

[0012] An end plate insulating sheet is provided between the first end plate component and the adjacent battery cell, and between the second end plate component and the adjacent battery cell.

[0013] The bottoms of both the first and second sub-modules are bonded to the bottom of the external battery module housing via horizontally distributed strip adhesive.

[0014] The first component of the end plate and the second component of the end plate are interlocked;

[0015] There is a reserved gap between the opposite sides of the first end plate component and the second end plate component;

[0016] The battery module body has a packing strap wrapped around its top and bottom sides.

[0017] The first end plate component after vertical flipping has the same structure as the second end plate component;

[0018] For the first component of the end plate, a first fixed end is provided at both the front and rear ends of its upper right side;

[0019] A second fixed end is provided at both the front and rear ends of the lower right side of the first component of the end plate;

[0020] At the bottom center of each of the two first fixed ends, a guide positioning cylinder is provided;

[0021] A guide positioning groove is provided at the bottom center of each of the two second fixed ends;

[0022] The shape and size of the guide positioning cylinder correspond to and match the shape and size of the guide positioning groove.

[0023] Preferably, the cross-sectional area of ​​the adhesive between the first sub-module and the bottom of the external battery module housing is smaller than the bottom area of ​​the first sub-module.

[0024] The cross-sectional area of ​​the adhesive between the bottom of the second sub-module and the bottom of the external battery module housing is smaller than the bottom area of ​​the second sub-module.

[0025] Preferably, a horizontally distributed module bottom insulating sheet is provided on both the front and rear sides of the bottom of the first sub-module and the second sub-module;

[0026] The thickness of the insulating sheet at the bottom of the module is equal to the thickness of the adhesive between the bottom of the first and second sub-modules and the bottom of the battery module housing located on the outside.

[0027] Preferably, the first sub-module and the second sub-module include the same number of battery cells;

[0028] The front-end board and the back-end board have the same structure;

[0029] The front end plate and the rear end plate are respectively connected to the insulating sheet of the adjacent end plate by adhesive;

[0030] The first end plate component and the second end plate component are respectively connected to the adjacent end plate insulating sheet by adhesive;

[0031] Each end plate insulating sheet is connected to the adjacent battery cell using an adhesive.

[0032] Preferably, an end plate lifting groove is provided at the middle of the front and rear ends on the left side of the front plate;

[0033] There is also an end plate hoisting slot at the middle of the front and rear ends on the right side of the rear end plate.

[0034] Preferably, for any two adjacent battery cells, two foam blocks are provided between their opposite sides at a front-to-back interval.

[0035] Preferably, a first hoisting groove is provided between the two first fixed ends;

[0036] The top of the first hoisting slot has a hoisting lateral stop;

[0037] On each side of the two second fixed ends that are opposite to each other, there is a second hoisting slot.

[0038] Preferably, for the first end plate component, a first fixing point for a heating element that protrudes vertically backward is provided on the upper right front end of the first end plate component;

[0039] A second fixing point for a heating element is provided at the lower right rear end of the first component of the end plate;

[0040] The first fixing point and the second fixing point of the heating element are respectively connected to the positioning holes at corresponding positions on the front and rear sides of the U-shaped heating element;

[0041] The inner sides of the front and rear sides of the heating element are bonded to the front and rear sides of the battery module body.

[0042] The heating element is located between the two packing straps;

[0043] Multiple intersecting reinforcing ribs are provided in the middle area of ​​the opposite side of the first end plate member and the second end plate member.

[0044] Preferably, on the right side of the first component of the end plate, below the two second fixed ends, there is a longitudinally distributed first fixed end docking groove.

[0045] The first fixed end is connected to the receiving groove to receive the first fixed end on the second component of the end plate.

[0046] Preferably, the guide positioning cylinder located on the upper part of the first component of the end plate is inserted into the guide positioning groove located on the upper part of the second component of the end plate.

[0047] The guide positioning groove located at the lower part of the first component of the end plate is inserted into the guide positioning cylinder located at the lower part of the second component of the end plate.

[0048] As can be seen from the technical solution provided by the present invention above, compared with the prior art, the present invention provides a novel battery module with a scientifically designed structure. By adding a detachable intermediate end plate structure in the middle of the module, the battery module is easy to disassemble, solving the problem of difficult disassembly and repair of the module in the prior art. At the same time, a structure that can absorb the expansion force of the battery module is designed on the detachable intermediate end plate to improve the cycle performance of the battery module and increase the overall service life of the battery module. This is beneficial to improving the market application prospects of the battery manufacturer's products and has significant practical significance. Attached Figure Description

[0049] Figure 1 This is a three-dimensional structural diagram of a novel battery module provided by the present invention;

[0050] Figure 2 This is a three-dimensional exploded view of a novel battery module provided by the present invention;

[0051] Figure 3 A schematic diagram of the assembly state of a novel battery module provided by the present invention, which uses a detachable intermediate end plate;

[0052] Figure 4 This invention provides a schematic diagram of the assembly state of a first sub-module, which includes a front-end board, an end-board first component, and multiple battery cells.

[0053] Figure 5 A three-dimensional structural diagram of the first end plate component in a novel battery module provided by the present invention; the shape and structure of the second end plate component are exactly the same as those of the first end plate component;

[0054] Figure 6 For along Figure 5 A schematic diagram of the first component region of the end plate obtained after dividing by line AA;

[0055] Figure 7 A three-dimensional structural diagram of the front-end board in a novel battery module provided by the present invention; the shape and structure of the rear-end board are the same as those of the front-end board;

[0056] Figure 8 A schematic diagram of a heating element installed in a specific embodiment of a novel battery module provided by the present invention;

[0057] In the diagram, 10 is the front-end board, 101 is the end-board mounting slot, 20 is the end-board insulating sheet (specifically, a polycarbonate PC sheet), 30 is the battery cell, 50 is the bottom insulating sheet of the module (specifically, a polycarbonate PC sheet), and 40 is the foam block.

[0058] 60. Separable intermediate end plate; 601. First end plate component; 602. Second end plate component;

[0059] 6011, First fixed end; 6012, First fixed point of heating element; 6013, Second fixed end; 6014, Reinforcing rib; 6015, Guide positioning groove;

[0060] 6016, second fixing point of heating element; 6017, first lifting slot; 6018, guide positioning cylinder; 6019, second lifting slot;

[0061] 70. Packing straps; 80. Rear end plate; 90. Heating element;

[0062] 100, First sub-module; 200, Second sub-module. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0067] See Figures 1 to 8 The present invention provides a novel battery module, including a battery module body 1000;

[0068] The battery module body 1000 includes a first sub-module 100 and a second sub-module 200;

[0069] The first sub-module 100 and the second sub-module 200 each include a plurality of battery cells 30 arranged in parallel.

[0070] The left and right sides of the first sub-module 100 are respectively provided with a front end plate 10 and an end plate first component 601;

[0071] The second sub-module 200 has a second end plate component 602 and a rear end plate 80 on its left and right sides, respectively.

[0072] An end plate insulating sheet (specifically a polycarbonate PC sheet) 20 is provided between the front end plate 10 and the adjacent battery cell 30, and between the rear end plate 8 and the adjacent battery cell 30.

[0073] An end plate insulating sheet (specifically a polycarbonate PC sheet) 20 is provided between the first end plate component 601 and the adjacent battery cell 30, and between the second end plate component 602 and the adjacent battery cell 30.

[0074] The bottoms of the first sub-module 100 and the second sub-module 200 are both bonded to the bottom of the external battery module housing by horizontally distributed strip adhesive.

[0075] The first component 601 and the second component 602 of the end plate are inserted into each other;

[0076] There is a reserved gap (i.e., a hollow cavity) between the opposite sides of the first end plate component 601 and the second end plate component 602.

[0077] It should be noted that after the first component 601 and the second component 602 of the end plate are inserted together, they are combined to form a separate intermediate end plate 60, as shown below. Figure 3 As shown.

[0078] In this invention, specifically, the cross-sectional area of ​​the adhesive between the first sub-module 100 and the bottom of the external battery module housing is smaller than the bottom area of ​​the first sub-module 100.

[0079] The cross-sectional area of ​​the adhesive between the bottom of the second sub-module 200 and the bottom of the external battery module housing is smaller than the bottom area of ​​the second sub-module 200. In other words, only a small amount of adhesive is applied to the bottom of the first sub-module 100 and the second sub-module 200; for example, the area covered by the adhesive is only one-sixth of the bottom area of ​​the first sub-module 100 or the second sub-module 200.

[0080] In this invention, specifically, a packing strap 70 (steel strap) is wrapped around the upper and lower ends of the four sides of the battery module body 1000.

[0081] In this invention, specifically, the number of battery cells 30 included in the first sub-module 100 and the second sub-module 200 is the same.

[0082] In this invention, specifically, the bottom front and rear sides of the first sub-module 100 and the second sub-module 200 are each provided with a horizontally distributed module bottom insulating sheet (specifically a polycarbonate PC sheet) 50.

[0083] It should be noted that the insulation sheet (specifically a polycarbonate PC sheet) 50 at the bottom of the module can ensure the insulation performance between the first sub-module 100 and the second sub-module 200 and the external battery module housing.

[0084] In practice, the thickness of the bottom insulating sheet 50 of the module is equal to the thickness of the adhesive between the bottom of the first sub-module 100 and the second sub-module 200 and the bottom of the external battery module housing. Furthermore, the bottom insulating sheet 50 and the adhesive are spaced apart.

[0085] In this invention, specifically, the front-end board 10 and the rear-end board 80 have the same structure;

[0086] The front end plate 10 and the rear end plate 80 are respectively connected to the adjacent end plate insulating sheet (specifically, a polycarbonate PC sheet) 20 by an adhesive (specifically, a thermally conductive adhesive).

[0087] Each end plate insulating sheet 20 is connected to the adjacent battery cell 30 by an adhesive (specifically, thermally conductive adhesive).

[0088] In this invention, specifically, an end plate hoisting groove 101 is provided at the middle of the front and rear ends on the left side of the front end plate 10.

[0089] An end plate hoisting groove 101 is also provided at the middle of the front and rear ends on the right side of the rear end plate 80.

[0090] In this invention, specifically, the first end plate component 601 and the second end plate component 602 are respectively connected to the adjacent end plate insulating sheet (specifically a polycarbonate PC sheet) 20 by an adhesive (specifically a thermally conductive adhesive).

[0091] Each end plate insulating sheet 20 is connected to the adjacent battery cell 30 by an adhesive (specifically, thermally conductive adhesive).

[0092] In this invention, specifically, for any two adjacent battery cells 30, two foam blocks 40 are provided between their opposite sides, spaced apart.

[0093] It should be noted that the foam in foam block 40 is a material with compression resilience, and foam block 40 is used to absorb the lateral force generated by the expansion of the module.

[0094] In the specific implementation of this invention, see also [link to relevant documentation]. Figure 2 , Figure 5 , Figure 6 At the front and rear ends of the upper right side of the first component 601 of the end plate, a first fixed end 6011 is provided respectively.

[0095] A second fixed end 6013 is provided at the front and rear ends of the lower right side of the first component 601 of the end plate;

[0096] At the bottom center of each of the two first fixed ends 6011, a guide positioning cylinder 6018 is provided;

[0097] At the bottom center of each of the two second fixed ends 6013, a guide positioning groove 6015 is provided;

[0098] The shape and size of the guide positioning cylinder 6018 correspond to and match the shape and size of the guide positioning groove 6015.

[0099] In specific implementation, a first hoisting slot 6017 is provided between the two first fixed ends 6011;

[0100] The top of the first hoisting slot 6017 has a hoisting lateral stop 60170;

[0101] On one side of the two second fixed ends 6013 facing each other, a second hoisting slot 6019 is provided respectively;

[0102] In specific implementation, for the first component 601 of the end plate, a first fixing point 6012 for a heating element that protrudes vertically backward is provided on the upper part of the right front end of the first component 601 of the end plate.

[0103] A second fixing point 6016 for a heating element is provided at the lower right rear end of the first component 601 of the end plate;

[0104] For specific implementation details, please refer to [link / reference]. Figure 8 For the first component 601 of the end plate, the first fixing point 6012 and the second fixing point 6016 of the heating element are respectively connected to the positioning holes 91 at the corresponding positions on the front and rear sides of the U-shaped heating element 90, thereby playing the role of positioning the heating element; the specific structural design can be: the threaded through holes on the first fixing point 6012 and the second fixing point 6016 of the heating element are threadedly fixed to the positioning holes 91 (threaded positioning holes) on the front and rear sides of the U-shaped heating element 90 by positioning bolts or pan head screws.

[0105] It should be noted that the fixing points (i.e., the first fixing point 6012 and the second fixing point 6016 of the heating element) and the positioning holes on the heating element 90 are mainly for convenient positioning during installation, and are specifically connected by pan head screws.

[0106] In practice, the inner sides of the front and rear sides of the heating element 90 have adhesive backing.

[0107] The inner sides of the front and rear sides of the heating element 90 are bonded to the front and rear sides of the battery module body 1000.

[0108] The heating element 90 is located between the two packing straps 70;

[0109] In practice, the heating element 90 can use existing PET heating film. PET heating film is a polymer electrothermal film, which is made by adding conductive particles to organic materials, processing them into thin film materials and then encapsulating them. When electricity is applied, it produces a heating effect.

[0110] In specific implementation, on the right side of the first component 601 of the end plate, below the two second fixed ends 6013, there is a longitudinally distributed first fixed end docking and receiving groove 60130.

[0111] The first fixed end docking receiving groove 60130 is used to receive the first fixed end 6011 on the second component 602 of the end plate.

[0112] In practice, the first component 601 of the end plate after inversion (i.e., vertical flipping) has the same structure as the second component 602 of the end plate.

[0113] It should be noted that, in this invention, the first end plate component and the second end plate component have the same structure and are installed in reverse during use.

[0114] In specific implementation, the guide positioning cylinder 6018 located on the upper part of the first component 601 of the end plate is inserted into the guide positioning groove 6015 located on the upper part of the second component 602 of the end plate.

[0115] The guide positioning groove 6015 located at the lower part of the first component 601 of the end plate is inserted into the guide positioning cylinder 6018 located at the lower part of the second component 602 of the end plate.

[0116] In specific implementation, multiple cross-distributed reinforcing ribs 6014 are respectively provided in the middle area on the opposite side of the first end plate component 601 and the second end plate component 602 (i.e., the right side of the first end plate component 601 and the left side of the second end plate component 602).

[0117] It should be noted that, in order to meet the requirements of detachable maintenance, this invention utilizes a newly designed detachable intermediate end plate to transform the disassembly of the module into the disassembly of two small modules (i.e., the first sub-module 100 and the second sub-module 200), reducing the disassembly force and making disassembly more convenient. Simultaneously, this invention also reserves a certain gap inside the detachable intermediate end plate, which can be used to offset the adverse effects of module expansion forces, thus improving the module's cycle life.

[0118] To better understand the technical solution of the present invention, the assembly and disassembly processes of the present invention are described below.

[0119] 1. The battery module provided by the present invention can be assembled into a front-end board part and a rear-end board part (i.e., the first sub-module 100 and the second sub-module 200) during assembly.

[0120] Firstly, on one hand, the front-end board portion (i.e., the first sub-module 100) includes a front-end board 10, an end-plate insulating sheet 20, multiple battery cells 30, multiple foam blocks 40, and an end-plate first component 601, according to... Figure 2 As shown in the diagram, the final front-end board (i.e., the first sub-module 100) is assembled as follows. Figure 4 As shown;

[0121] On the other hand, the rear panel (i.e., the second sub-module 200) includes a rear panel 80, an end panel insulating sheet 20, multiple battery cells 30, multiple foam blocks 40, and an end panel second component 602, according to... Figure 2 Assemble as shown;

[0122] Then, the second component 602 of the end plate is arranged according to... Figure 2 As shown, it is assembled with the first component 601 of the end plate.

[0123] Then, after assembling the two parts, the rear end plate 80 is first installed on the bottom crossbeam of the external battery module box, and then the guide positioning cylinder 6018 in the two intermediate end plate components (i.e., end plate first component 601 and end plate second component 602) cooperates with the guide positioning groove 6015 to assemble, and finally complete the assembly of the entire battery module.

[0124] Second, when disassembling the battery module provided by the present invention, it is necessary to disassemble it in reverse order of installation. First, the front end plate part (i.e., the first sub-module 100) is lifted and disassembled by cooperating the first lifting groove 6017 on the end plate first component 601 distributed on both sides with the end plate lifting groove 101 on the front end plate 10. Then, the rear end plate part (i.e., the second sub-module 200) is lifted and disassembled by cooperating the end plate lifting groove 101 on the rear end plate 80 distributed on both sides with the second lifting groove 6019 on the end plate second component 602. Finally, the disassembly operation of the module is completed, that is, the module is divided into two small modules for disassembly operation.

[0125] Compared with the prior art, the novel battery module provided by the present invention has the following beneficial effects:

[0126] 1. In this invention, the split intermediate end plate is formed by splicing the first end plate component and the second end plate component together through the positioning guide posts and positioning guide grooves on both. This allows the module to be decomposed into two relatively smaller modules during disassembly, reducing disassembly force and making disassembly easier.

[0127] 2. In this invention, the first end plate component and the second end plate component have completely identical structures, except that they need to be inverted during installation. By flipping and inverting them, the connection can be achieved, reducing manufacturing costs and assembly error rates.

[0128] 3. In this invention, considering that the module will expand periodically during charging and discharging, and the components will be under great pressure, which may cause the steel strip to break and cause safety problems, this invention reserves a certain gap between the first component and the second component of the end plate to absorb the adverse effects of the module expansion force, ensure a relatively constant module preload force, and improve cycle performance.

[0129] 4. The present invention also includes a reinforcing rib designed in the middle part of the first end plate component and the second end plate component to ensure that the strength of the split middle end plate meets the preset requirements and can meet the requirements for use.

[0130] In summary, compared with existing technologies, the novel battery module provided by this invention has a scientifically designed structure. By adding a detachable intermediate end plate structure in the middle of the module, it is easy to disassemble the battery module, solving the problem of difficult disassembly and repair of existing modules. At the same time, a structure that can absorb the expansion force of the battery module is designed on the detachable intermediate end plate to improve the cycle performance of the battery module and increase the overall service life of the battery module. This is beneficial to improving the market application prospects of battery manufacturers' products and has significant practical significance.

[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 module, characterized in that, Including the main body of the battery module (1000); The battery module body (1000) includes a first sub-module (100) and a second sub-module (200); The first sub-module (100) and the second sub-module (200) each include multiple battery cells (30) arranged in parallel. On the left and right sides of the first sub-module (100), a front end plate (10) and an end plate first component (601) are respectively provided. The second sub-module (200) has a second end plate component (602) and a rear end plate (80) respectively on its left and right sides. An end plate insulating sheet (20) is provided between the front end plate (10) and the adjacent battery cell (30) and between the rear end plate (80) and the adjacent battery cell (30). An end plate insulating sheet (20) is provided between the first end plate component (601) and the adjacent battery cell (30), and between the second end plate component (602) and the adjacent battery cell (30). The bottoms of the first sub-module (100) and the second sub-module (200) are both bonded to the bottom of the external battery module housing by horizontally distributed strip adhesive. The first end plate component (601) and the second end plate component (602) are interlocked; There is a reserved gap between the opposite sides of the first end plate component (601) and the second end plate component (602); The battery module body (1000) has a packing strap (70) wrapped around its upper and lower sides. The first component (601) of the end plate after vertical flipping has the same structure as the second component (602) of the end plate; For the first component of the end plate (601), a first fixed end (6011) is provided at the front and rear ends of the upper right side. A second fixed end (6013) is provided at the front and rear ends of the lower right side of the first component (601) of the end plate. At the bottom center of each of the two first fixed ends (6011), a guide positioning cylinder (6018) is provided. At the bottom center of each of the two second fixed ends (6013), a guide positioning groove (6015) is provided. The shape and size of the guide positioning cylinder (6018) correspond to and match the shape and size of the guide positioning groove (6015); At the middle of the front and rear ends of the left side of the front plate (10), there is an end plate hoisting groove (101). At the middle of the front and rear ends of the right side of the rear end plate (80), there is also an end plate hoisting groove (101). A first hoisting slot (6017) is provided between the two first fixed ends (6011). The top of the first hoisting slot (6017) has a hoisting lateral stop (60170). On the opposite side of the two second fixed ends (6013), a second hoisting slot (6019) is provided respectively.

2. The battery module as described in claim 1, characterized in that, The cross-sectional area of ​​the adhesive between the first sub-module (100) and the bottom of the external battery module housing is smaller than the bottom area of ​​the first sub-module (100). The cross-sectional area of ​​the adhesive between the bottom of the second sub-module (200) and the bottom of the battery module housing located on the outside is smaller than the bottom area of ​​the second sub-module (200).

3. The battery module as described in claim 1, characterized in that, Both the bottom front and rear sides of the first sub-module (100) and the second sub-module (200) are provided with a horizontally distributed module bottom insulating sheet (50). The thickness of the bottom insulating sheet (50) of the module is equal to the thickness of the adhesive between the bottom of the first sub-module (100) and the second sub-module (200) and the bottom of the battery module housing located on the outside.

4. The battery module as described in claim 1, characterized in that, The first sub-module (100) and the second sub-module (200) include the same number of battery cells (30); The front-end board (10) and the rear-end board (80) have the same structure; The front end plate (10) and the rear end plate (80) are respectively connected to the adjacent end plate insulating sheet (20) by adhesive; The first end plate component (601) and the second end plate component (602) are respectively connected to the adjacent end plate insulating sheet (20) by adhesive; Each end plate insulating sheet (20) is connected to the adjacent battery cell (30) by an adhesive.

5. The battery module as described in claim 1, characterized in that, For any two adjacent battery cells (30), two foam blocks (40) are provided between their opposite sides, spaced apart.

6. The battery module as described in claim 1, characterized in that, For the first end plate component (601), a first fixing point (6012) for a heating element that protrudes vertically backward is provided on the upper right front end of the first end plate component (601). A second fixing point (6016) for a heating element is provided at the lower right rear end of the first component (601) of the end plate. The first fixing point (6012) and the second fixing point (6016) of the heating element are respectively connected to the positioning holes (91) at the corresponding positions on the front and rear sides of the U-shaped heating element (90); The inner sides of the front and rear sides of the heating element (90) are bonded to the front and rear sides of the battery module body (1000); The heating element (90) is located between the two packing straps (70); Multiple intersecting reinforcing ribs (6014) are provided in the middle area of ​​the opposite side of the first end plate component (601) and the second end plate component (602).

7. The battery module as described in claim 1, characterized in that, On the right side of the first component (601) of the end plate, below the two second fixed ends (6013), there is a longitudinally distributed first fixed end docking receiving groove (60130). The first fixed end docking receiving groove (60130) is used to receive the first fixed end (6011) on the second component (602) of the end plate.

8. The battery module as described in any one of claims 1 to 7, characterized in that, The guide positioning cylinder (6018) located on the upper part of the first component (601) of the end plate is inserted into the guide positioning groove (6015) located on the upper part of the second component (602) of the end plate. The guide positioning groove (6015) located at the lower part of the first component (601) of the end plate is inserted into the guide positioning cylinder (6018) located at the lower part of the second component (602) of the end plate.

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