Large battery cell module

Abstract

The invention provides a large battery cell module and an assembling method, a bottom plate assembly comprises a bottom plate and bottom plate sealing members around the bottom plate, side plates are arranged on two opposite front and back sides of the bottom plate, end plates are arranged on two opposite left and right sides of the bottom plate, and the side plates, the end plates and the bottom plate are sealed by the bottom plate sealing members; end plate sealing pieces are arranged on the front side edge and the rear side edge of the end plate and seal the front side edge and the rear side edge of the end plate and the side plate. The front surface of the bottom plate is provided with a plurality of front surface main grooves, the bottoms of the battery cells are positioned in the front surface main grooves, and gaps between the adjacent battery cells are filled with filling glue; an integrated cover plate assembly is arranged above the battery cell and comprises a copper bar electrically connected with the battery cell; a top cover is arranged on the integrated cover plate assembly and fixedly connected with the cover plate assembly. The bottom frame and the peripheral frame are both in a sealed form, and after filling glue (such as polyurethane polystyrene foam) is filled inside, the defects of glue leakage, excessive glue at multiple positions, low foaming and filling yield when the polystyrene foam is filled and the like are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a large battery cell module. Background Art

[0002] Lithium-ion batteries have the advantages of light weight, large energy storage, high power, no pollution, long life, small self-discharge coefficient, wide temperature adaptability, etc., so they are gradually favored by people and gradually replace other traditional batteries in the field of energy storage and power batteries. Cylindrical lithium batteries have the characteristics of high production efficiency, low production cost, good product consistency, etc., so they occupy a large market share in the market, for example: 46 series cylindrical battery cells.

[0003] In the application field of vehicle-mounted PACK, the design is often carried out in the form of modules. However, due to the limitations of energy density, structural strength, reliability, manufacturing feasibility, cost rigidity and other factors, in order to meet the above design goals, the general 46 series cylindrical battery module adopts a foam adhesive structure, but because the foaming process has high requirements for structural design (such as: to ensure the filling rate inside the module, the glue distribution is required to be uniform), the design of the module is generally very complicated, and there are often some immature technologies (such as: unable to effectively control the overflow of glue during the foaming process / unable to ensure a satisfactory glue filling rate / insufficient overall rigidity of the module, etc.), and it is impossible to achieve large-scale application in vehicle-mounted PACK. Summary of the invention

[0004] Based on the above content, the present invention provides a large battery cell module, aiming to solve the technical problems such as glue overflow in the battery cell module in the prior art.

[0005] A large battery cell module, comprising a bottom plate assembly, a side plate, an end plate, a battery cell, an integrated cover plate assembly and a top cover;

[0006] The bottom plate assembly includes a bottom plate and bottom plate seals around the bottom plate. Side plates are arranged on two opposite sides of the bottom plate, and end plates are arranged on two opposite sides of the bottom plate. The bottom plate seals seal the side plates, the end plates and the bottom plate.

[0007] End plate seals are provided on both front and rear sides of the end plate, and the end plate seals the front and rear sides of the end plate and the side plate;

[0008] The front side of the bottom plate has a plurality of front main grooves, the bottom of the battery cell is positioned in the front main grooves, and the gaps between adjacent battery cells are filled with filling glue;

[0009] An integrated cover assembly is provided above the battery cell, and the integrated cover assembly includes a copper busbar electrically connected to the battery cell;

[0010] A top cover is arranged on the integrated cover plate assembly, and the top cover and the cover plate assembly are fixedly connected.

[0011] Furthermore, the battery cell module also includes a liquid cooling assembly, which includes a liquid cooling plate and a liquid cooling pipe assembly; the liquid cooling plate extends between the battery cells;

[0012] A fluid channel is formed inside the extended plate body of the liquid cooling plate;

[0013] The gap between the battery cell and the extended plate of the liquid cooling plate is filled with filling glue;

[0014] After the liquid cooling pipe connector of the liquid cooling plate is connected to the liquid cooling pipe assembly, the liquid cooling pipe assembly is communicated with the fluid channel for the cooling fluid to enter and exit.

[0015] Furthermore, a back main groove is provided on the back of the bottom plate; the groove bottom of the back main groove corresponds to the groove bottom of the front main groove up and down and forms a groove bottom thin wall;

[0016] A pressure relief channel is connected between two adjacent back main grooves and between the left and right sides of the bottom plate and the adjacent back main grooves.

[0017] Furthermore, a back side secondary groove is formed at the bottom of the back side main groove.

[0018] Furthermore, the pressure relief channel is a pressure relief notch, and the bottom of the part of the pressure relief notch connected to the back main groove is provided with a protruding rib extending into the back main groove.

[0019] Furthermore, an end plate buckle position is provided at the lower end of each end plate;

[0020] The bottom plate seal includes a second bottom plate foam strip;

[0021] The left and right sides of the bottom plate are provided with first narrow grooves extending in the front-to-back direction, the second bottom plate foam strip is built into the first narrow groove, and the bottom plate buckle position is provided outside the first narrow groove;

[0022] The end plate is fixed to the bottom plate through the snap connection of the corresponding end plate buckle positions and the bottom plate buckle positions, and the lower end surface of the end plate contacts the second bottom plate foam strip.

[0023] Furthermore, the front side of the bottom plate has a plurality of rows of front main grooves, and each row of the front main grooves is arranged along the left-right direction of the bottom plate;

[0024] The liquid cooling assembly includes a plurality of the liquid cooling plates, each of which includes an extended plate body and a liquid cooling pipe connector at the right end, and the liquid cooling pipe connector and the liquid cooling pipe assembly are connected to form a liquid cooling plate parallel structure;

[0025] The extended plate body of the liquid cooling plate extends along the left-right direction between two adjacent rows of the battery cells disposed in the front main groove;

[0026] The right end plate on the right side of the bottom plate has an end plate U-shaped groove corresponding to the liquid cooling plate one by one, and the end plate U-shaped groove opens at the lower end of the right end plate;

[0027] A liquid cooling plate seal is provided on the extended plate body of the liquid cooling plate in an area close to the liquid cooling pipe connector;

[0028] The area of ​​the liquid cooling plate covered with the liquid cooling plate seal is inserted into the corresponding U-shaped groove of the end plate;

[0029] A block groove is provided on the right side of the bottom plate in an area corresponding to the bottom of the liquid cooling plate seal, the block groove is connected to the first narrow groove, a bottom plate foam block is provided in the block groove, and the bottom plate foam block contacts the corresponding liquid cooling plate seal.

[0030] Furthermore, the bottom of the inner surface of each side panel is provided with a side panel L-shaped rib extending in the left-right direction;

[0031] The bottom plate sealing member includes a first bottom plate foam strip extending in the left-right direction at the front side edge and the rear side edge of the bottom plate;

[0032] The L-shaped ribs of the side panels at the bottom of the inner surface of the side panels hook the bottom panel, and a first bottom panel foam strip is sandwiched between the bottom panel and the bottom of the inner surface of the side panels.

[0033] Furthermore, a plurality of side panel inner ribs extending in the left-right direction are provided between the side panel L-shaped ribs at the top and bottom of the inner surface of the side panel;

[0034] The inner reinforcement of the side panel is T-shaped reinforcement.

[0035] Furthermore, the L-shaped ribs of the side panels at the top of the inner surface of the side panels are provided with side panel outer guide grooves at both left and right ends;

[0036] The inner ribs of the side panels on the inner surface of the side panels are provided with inner guide grooves at both left and right ends;

[0037] End plate ribs are provided at the upper ends of the front and rear sides of the inner surface of the end plate;

[0038] End plate grooves are provided at the lower ends of the front and rear sides of the inner surface of the end plate;

[0039] The end plate seal is an end plate seal strip having a hook portion;

[0040] The outer guide groove of the side plate and the inner guide groove of the side plate limit the left and right movement of the end plate sealing strip;

[0041] The hook portion of the end plate sealing strip is embedded in the end plate groove;

[0042] The outer guide groove of the side plate limits the forward and backward movement of the end plate reinforcement.

[0043] Further, the integrated cover plate assembly also includes an integrated cover plate, and the copper busbar is positioned on the front side of the integrated cover plate;

[0044] The integrated cover plate is provided with a plurality of welding reserved holes, each of which is aligned with the upper end surface of a battery cell;

[0045] A protective thin wall is provided at the welding reserved hole, the protective thin wall is connected to a protective ring, and the copper busbar is welded correspondingly to the positive electrode of the battery cell below through the inside of the protective ring.

[0046] Furthermore, a plurality of copper bar positioning columns are provided on the front side of the integrated cover plate.

[0047] The present invention also provides a method for assembling a large battery cell module, which is used to manufacture the aforementioned large battery cell module, and comprises the following steps:

[0048] Step A1, prepare a bottom plate assembly, and place the bottom plate assembly flat on an operating table, wherein the bottom plate assembly includes a bottom plate and bottom plate seals around the bottom plate;

[0049] Step A2, installing side panels on the front side and the rear side of the bottom plate assembly;

[0050] Step A3, installing end plates on the left and right sides of the bottom plate assembly, and end plate seals are provided on both the front and rear sides of each end plate. When installing, the end plate seals seal the contact between the end plate and the corresponding side plate, and after installation, the bottom plate seals seal the side plate, the end plate and the bottom plate;

[0051] Step A4, injecting filling glue into the bottom plate assembly, and then placing the battery cell into the main groove on the front side of the bottom plate;

[0052] Step A5, fixing the integrated cover plate assembly above the battery cell and the side plate relative to each other, and welding the copper busbar on the integrated cover plate assembly and the battery cell with a laser;

[0053] Step A6, covering the top cover on the integrated cover assembly, and fixing the top cover and the integrated cover assembly together.

[0054] The beneficial technical effect of the present invention is that the bottom plate, the side plate and the end plate are sealed by the bottom plate seal, and the contact between the end plate and the side plate is sealed by the end plate seal, so that the bottom and the surrounding frames of the large battery cell module are sealed. When the interior is filled with filling glue (such as polyurethane foam glue), the shortcomings of glue leakage, glue overflow in multiple places, and low foaming filling yield when using foam glue are avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is a schematic diagram of the front assembly of a large battery cell module of the present invention;

[0056] Figure 2 This is a schematic diagram of the back assembly of a large battery cell module of the present invention;

[0057] Figure 3This is an exploded view of the back of a large battery module of the present invention;

[0058] Figure 4 This is a schematic diagram of the front side of a large cell module bottom plate assembly of the present invention;

[0059] Figure 5 This is a schematic diagram of the back side of a large battery cell module bottom plate assembly of the present invention;

[0060] Figure 6 This is an exploded view of a large battery cell module bottom plate assembly of the present invention;

[0061] Figure 7-8 It is a partial schematic diagram of the front side of a large battery cell module bottom plate assembly of the present invention;

[0062] Fig. 9 It is a partial schematic diagram of the back side of a large battery cell module bottom plate assembly of the present invention;

[0063] Fig.10 It is a schematic diagram of the outer surface of the right end plate of a large battery cell module of the present invention;

[0064] Fig.11 A schematic diagram of the inner surface of the right end plate of a large battery cell module of the present invention;

[0065] Fig.12 This is an exploded view of the right end plate of a large battery cell module of the present invention;

[0066] Fig.13 A schematic diagram of the outer surface of a side plate of a large battery cell module of the present invention;

[0067] Fig.14 A schematic diagram of the inner surface of a side plate of a large battery cell module of the present invention;

[0068] Fig.15 A side view of a side plate of a large battery cell module of the present invention;

[0069] Fig.16 This is a partial schematic diagram of the inner surface of a side plate of a large battery cell module of the present invention;

[0070] Fig.17 This is a general assembly diagram of a large battery cell module integrated cover plate assembly of the present invention;

[0071] Fig.18 An exploded view of an integrated cover plate assembly of a large battery cell module according to the present invention;

[0072] Figure 19-20 This is a partial schematic diagram of a large battery cell module integrated cover assembly of the present invention;

[0073] Fig.21 This is a schematic diagram of the clamping connection between the cover plate and the side plate of a large battery cell module of the present invention;

[0074] Fig. 22 This is a schematic diagram of a large battery cell module liquid cooling plate of the present invention;

[0075] Fig.23 A schematic diagram of a large cell module battery cell thermal runaway breaking through the thin wall at the bottom of a slot according to the present invention;

[0076] Fig.24 It is a schematic diagram of the diffusion of thermal runaway gas of a large cell module along a pressure relief channel of the present invention;

[0077] Fig.25 This is a schematic diagram of the installation of a large cell module cell end plate, bottom plate, side plate, and liquid cooling plate assembly of the present invention;

[0078] Fig.26 A schematic diagram of the position limiting constraints of the end plate and the side plate of a large electric core module of the present invention;

[0079] Fig. 27 This is a schematic diagram of the position limiting constraints of the end plate and the bottom plate of a large battery cell module of the present invention;

[0080] Figure 28-Figure 41 The present invention is a schematic diagram of the process structure of a method for assembling a large battery cell module.

[0081] Fig.42 The present invention is a flowchart of the steps of assembling a large battery cell module.

[0082] in,

[0083] 1-bottom plate assembly; 1-1-bottom plate; 1-2-first bottom plate foam strip; 1-3-second bottom plate foam strip; 1-4-bottom plate foam block; 1-5-front main groove; 1-6-bottom plate buckle position; 1-7-side wall secondary groove; 1-8-pressure relief channel; 1-9-back main groove; 1-10-protruding ribs; 1-11-bottom thin wall; 1-12-back secondary groove;

[0084] 2-front side panel; 2-1-side panel mounting piece; 2-2-side panel L-shaped rib; 2-3-side panel inner rib; 2-4-side panel inner guide groove; 2-5-side panel outer guide groove; 3-battery cell; 4-liquid cooling plate; 4-1-liquid cooling plate seal; 4-2-liquid cooling pipe connector; 5-liquid cooling pipe assembly; 6-left end plate; 7-right end plate; 7-1-end plate buckle; 7-2-end plate U-shaped groove; 7-3-end plate outer frame; 7-4-end plate Ribs; 7-5-end plate sealing strip; 7-6-end plate groove; 8-bolt fixing base; 9-fixing bolt; 10-rear side plate; 11-integrated cover assembly; 11-1-copper busbar; 11-2-integrated cover; 11-21-protective thin wall; 11-22-protective ring; 11-23-copper busbar positioning column; 11-24-cover buckle; 11-25-welding reserved hole; 12-top cover; 13-fixing screw. DETAILED DESCRIPTION

[0085] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0086] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0087] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0088] See also Figure 3 and Figure 8 The present invention provides a large battery cell module, comprising a bottom plate assembly (1), a side plate, an end plate, a battery cell (3), an integrated cover plate assembly (11) and a top cover (12);

[0089] The bottom plate assembly (1) comprises a bottom plate (1-1) and bottom plate seals around the bottom plate (1-1); side plates are provided on two opposite sides of the bottom plate (1-1) at the front and rear sides; end plates are provided on two opposite sides of the bottom plate (1-1); and the bottom plate seals seal the side plates, the end plates and the bottom plate (1-1);

[0090] End plate seals are provided on both front and rear sides of the end plate, and the end plate seals the front and rear sides of the end plate and the side plate;

[0091] The front side of the bottom plate (1-1) is provided with a plurality of front main grooves (1-5), the bottom of the battery cell (3) is positioned in the front main grooves (1-5), and the gaps between adjacent battery cells (3) are filled with filling glue;

[0092] An integrated cover plate assembly (11) is provided above the battery cell (3), and the integrated cover plate assembly (11) comprises a copper busbar (11-1) electrically connected to the battery cell (3);

[0093] A top cover (12) is provided on the integrated cover plate assembly (11), and the top cover (12) and the integrated cover plate assembly (11) are fixedly connected.

[0094] The present invention sets a main groove on the front side. When installing, fill the filling glue first and then install the battery cell. The filling glue is self-leveling, covers the groove, and fills the gaps between the battery cells and the gaps between the battery cells and the side plates and end plates, so that the strength of the module is further increased. The front, back, left, right, top (front, top), and bottom (back, bottom) of the present invention are arranged according to Figure 3 The exploded view is shown, and the latter refers to the direction the viewer looks. Figure 3 The direction of the explosion diagram, front refers to the opposite direction of the back, left refers to the direction the viewer is looking Figure 3 The left hand side of the exploded image is the direction the viewer is looking at. Figure 3 The right-hand direction of the exploded image is upward, which means the viewer is looking towards Figure 3 The direction of the explosion image is upward, and downward refers to the direction the viewer is looking. Figure 3 Exploded view of the direction of looking down.

[0095] The present invention achieves sealing of the four sides of the bottom plate (1-1) and the two front and rear side plates and the two left and right end plates through the bottom plate seal, and seals the contact between the end plate and the side plate through the end plate seal, so that the bottom and the surrounding frames of the large battery cell module are sealed. When the interior is filled with filling glue (such as polyurethane foam glue), the shortcomings of glue leakage, glue overflow in multiple places, and low foam filling yield when using foam glue are avoided.

[0096] Specifically, the bottom plate sealing element is foam.

[0097] Specifically, the end plate sealing element is foam.

[0098] Specifically, the battery cell (3) is a cylindrical battery cell, such as a 46 series cylindrical battery cell, and the front main groove (1-5) is a cylindrical groove matching the outer circumferential side of the battery cell (3).

[0099] Specifically, the bottom plate (1-1) is manufactured by using a plastic injection molding process.

[0100] See also Fig.13 Specifically, the outer surface of the side panels, such as the front side panel (2) and the rear side panel (10), is arranged along the left-right direction with at least two side panel mounting members (2-1), and the side panel mounting members (2-1) are provided with screw holes, so as to fix the entire large battery cell module and the external device to complete the installation and fixation of the entire module.

[0101] See also Figure 1 , Figure 2 and Fig. 22 Furthermore, the battery cell module also includes a liquid cooling assembly, which includes a liquid cooling plate (4) and a liquid cooling pipe assembly (5); the liquid cooling plate (4) extends between the battery cells (3);

[0102] A fluid channel is formed inside the extended plate body of the liquid cooling plate (4);

[0103] The gap between the battery core (3) and the extended plate body of the liquid cooling plate (4) is filled with a filling glue;

[0104] After the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) and the liquid cooling pipe assembly (5) are connected, the liquid cooling pipe assembly (5) and the fluid channel are communicated to allow cooling fluid to enter and exit.

[0105] Specifically, the liquid cooling pipe assembly (5) includes a water inlet pipe and a water outlet pipe, and the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) is provided with a water inlet connector and a water outlet connector to enable the coolant to enter the fluid channel and exit the fluid channel.

[0106] When the battery cells (3) are arranged in more than three rows, a liquid cooling plate (4) may be arranged between two adjacent rows of battery cells, and a plurality of liquid cooling plates (4) may be connected in parallel by connecting a liquid cooling pipe connector (4-2) and a liquid cooling pipe assembly (5), thereby achieving uniform heat dissipation for the battery cells (3).

[0107] See also Figure 4 , Figure 5 , Fig. 9 and Figure 23-Figure 24 Furthermore, a back main groove (1-9) is provided on the back of the bottom plate (1-1); the groove bottom of the back main groove (1-9) corresponds to the groove bottom of the front main groove (1-5) in vertical correspondence and forms a groove bottom thin wall (1-11);

[0108] A pressure relief channel (1-8) is connected between two adjacent back main grooves (1-9) and between the left and right sides of the bottom plate (1-1) and the adjacent back main grooves (1-9).

[0109] Specifically, the groove bottom of the rear main groove (1-9) corresponds to the groove bottom of the front main groove (1-5) in the vertical direction and has the same size to form a groove bottom thin wall (1-11), so that when the battery cell (3) has thermal runaway, it is easy to break through the groove bottom thin wall (1-11) and exhaust along the pressure relief channel (1-8). Furthermore, the groove bottom of the rear main groove (1-9) is also provided with a rear secondary groove (1-12).

[0110] When the battery cell (3) fails due to heat and emits gas, the secondary groove (1-12) on the back makes the thin wall of the groove bottom thinner in a local area, making it easier to break through the thin wall of the groove bottom (1-11), and the pressure relief channel (1-8) ensures that the structure can quickly release gas to prevent high pressure accumulation from causing module explosion.

[0111] Specifically, the secondary grooves (1-12) on the back are in a herringbone shape.

[0112] Furthermore, the pressure relief channel (1-8) is a pressure relief notch, and the bottom of the part of the pressure relief notch connected to the back main groove (1-9) is provided with a protruding rib (1-10) extending into the back main groove (1-9).

[0113] The protruding ribs (1-10) are used to provide mechanical support in the direction of gravity to the battery cell after the battery cell breaks through the thin wall due to thermal failure, thereby preventing the battery cell from falling off the back of the bottom plate (1-1).

[0114] A pressure relief structure and an exhaust channel are provided at the bottom of the module to prevent explosion due to energy accumulation.

[0115] Specifically, the front main groove (1-5) and the back main groove (1-9) are cylindrical shapes corresponding to each other, and when two rows of back main grooves (1-9) are arranged alternately, each back main groove (1-9) is adjacent to six back main grooves (1-9), forming six pressure relief notches, and the protruding ribs (1-10) provided at the bottom of three non-adjacent pressure relief notches extend into the back main groove (1-9), and the protruding ribs (1-10) provided at the bottom of the other three non-adjacent pressure relief notches extend into the corresponding back main groove (1-9) adjacent to the back main groove (1-9). In this way, each back main groove (1-9) only needs a small number of evenly distributed protruding ribs (1-10) to support the gravity of the battery cell.

[0116] The pressure relief notches of the back main grooves (1-9) in the same row, and the back main grooves (1-9) in the row close to the left and right sides of the bottom plate (1-1) and the pressure relief channels (1-8) provided between the adjacent sides of the left and right sides of the bottom plate (1-1) are arranged in a row along the left and right directions. The arrangement of the pressure relief channels in a row facilitates the rapid discharge of thermal runaway gas from the left and right sides of the bottom plate (1-1).

[0117] See also Figure 6 and Figure 7 , further, an end plate buckle position (7-1) is provided at the lower end of each end plate;

[0118] The bottom plate sealing member comprises a second bottom plate foam strip (1-3);

[0119] The left and right sides of the bottom plate (1-1) are provided with first narrow grooves extending in the front-to-back direction, the second bottom plate foam strip (1-3) is built into the first narrow groove, and bottom plate buckles (1-6) are provided outside the first narrow groove;

[0120] The end plate is fixed to the bottom plate (1-1) through a snap connection between the corresponding end plate buckle positions (7-1) and the bottom plate buckle positions (1-6), and the lower end surface of the end plate contacts the second bottom plate foam strip (1-3).

[0121] The bottom plate (1-1) and the end plate are assembled and fixed by snap connection between the end plate snap positions (7-1) and the bottom plate snap positions (1-6). The snap design simplifies the assembly process and improves efficiency.

[0122] Specifically, the bottom plate buckle position (1-6) is an open buckle position, and the end plate buckle position (7-1) is a protruding block buckle position. The protruding block buckle position is snapped into the bottom plate buckle position (1-6) which is an open buckle position, thereby realizing a snap connection.

[0123] The snap-on connection between the base plate and the end plate allows for quick installation of the base plate and the end plate, reducing the installation complexity of traditional battery cell modules and improving module efficiency.

[0124] Specifically, the end plate buckle position (7-1) is arranged at the lower end of the outer surface of the end plate.

[0125] See also Fig. 27 The end plate and the bottom plate are connected by buckles to constrain the movement of the end plate in the Z direction, that is, the up and down direction, so that the second bottom plate foam strip (1-3) at the bottom is compressed to achieve sealing of the left and right sides of the bottom plate.

[0126] See also Figure 10-12 , further, the front side of the bottom plate (1-1) has a plurality of rows of front main grooves (1-5), and each row of front main grooves (1-5) is arranged along the left-right direction of the bottom plate (1-1);

[0127] The liquid cooling assembly comprises a plurality of liquid cooling plates (4), wherein the liquid cooling plate (4) comprises an extended plate body and a liquid cooling pipe connector (4-2) at the right end, and the liquid cooling pipe connector (4-2) and the liquid cooling pipe assembly (5) are connected to form a liquid cooling plate parallel structure;

[0128] The extended plate body of the liquid cooling plate (4) extends in the left-right direction between two adjacent rows of battery cells (3) disposed in the front main groove (1-5); the right end plate (7) on the right side of the bottom plate (1-1) has an end plate U-shaped groove (7-2) corresponding to the liquid cooling plate (4) one by one, and the end plate U-shaped groove (7-2) opens at the lower end of the right end plate (7);

[0129] The extended plate body of the liquid cooling plate (4) is covered with a liquid cooling plate sealing member (4-1) in a region close to the liquid cooling pipe connecting member (4-2);

[0130] The area on the liquid cooling plate (4) covered with the liquid cooling plate sealing member (4-1) is inserted into the corresponding end plate U-shaped groove (7-2).

[0131] The liquid cooling plate seal (4-1) is made of foam material, for example. The end plate is sealed by squeezing between the end plate U-shaped groove (7-2) and the liquid cooling plate seal (4-1), the liquid cooling plate (4) extension body is sealed inside, and the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) is sealed outside, thereby avoiding glue overflow and the like.

[0132] The difference between the left end plate (6) and the right end plate (7) is that an end plate U-shaped groove (7-2) is added to the right end plate (7) to realize assembly with the liquid cooling plate assembly. The end plates are all made of plastic material.

[0133] Specifically, the side wall of the end plate U-shaped groove (7-2) is formed with side wall ribs, and the liquid cooling plate sealing member (4-1) on the liquid cooling plate (4) is squeezed by the side wall ribs, so that sealing at that location can be achieved.

[0134] Specifically, the bottom plate (1-1) can be formed by splicing a plurality of unit bottom plate panels.

[0135] Furthermore, the side wall of the front main groove (1-5) is provided with at least one side wall secondary groove (1-7), and the side wall secondary groove (1-7) extends from the bottom of the side wall of the front main groove (1-5) to the top edge of the side wall of the front main groove (1-5).

[0136] As a preferred embodiment, four side wall secondary grooves (1-7) are evenly distributed on the side wall of the front main groove (1-5). The side wall secondary grooves (1-7) allow a large gap to exist between the side wall of the battery cell and the front main groove (1-5) in a local area. During the battery cell assembly process, the filling glue is first filled and then the battery cell is placed, which facilitates the discharge of the filling glue from the front main groove.

[0137] Different from the prior art, the present invention first injects the filling glue, which is self-leveling, to fill the front main groove, and then puts the battery cell in. The side wall secondary grooves on the front main grooves (1-5) are conducive to the overflow of the filling glue in the front main grooves when the battery cell is placed, so that the firmness of the battery cell and the bottom plate assembly is enhanced, and the gaps between the filling glue and the side plates, end plates, and battery cells, and the gaps between the battery cell and the liquid cooling plate, so that the firmness of the entire battery cell module is enhanced.

[0138] Furthermore, two adjacent rows of front main grooves (1-5) are arranged in a staggered manner, and the extended plate body of the liquid cooling plate has a wave shape that matches the outer side surface of the battery core (3).

[0139] Through shape matching and positive heat dissipation area, uniform heat dissipation of the battery cell can be achieved, thereby improving heat dissipation efficiency.

[0140] See also Fig.25 Further, a block groove is provided in the area on the right side of the bottom plate (1-1) corresponding to the bottom of the liquid cooling plate seal (4-1), the block groove is connected to the first narrow groove, a bottom plate foam block (1-4) is provided in the block groove, and the bottom plate foam block (1-4) is in contact with the corresponding liquid cooling plate seal (4-1). The bottom plate foam block (1-4) and the liquid cooling plate seal (4-1) are in contact to achieve sealing.

[0141] See also Figure 14-15 and Fig.21 , further, the bottom and top of the inner surface of each side panel are provided with side panel L-shaped ribs (2-2) extending in the left-right direction;

[0142] The front side and the rear side of the bottom plate (1-1) are provided with a first bottom plate foam strip (1-2) extending in the left-right direction;

[0143] The side panel L-shaped ribs (2-2) at the bottom of the inner surface of the side panel hook the bottom panel (1-1), and the first bottom panel foam strip (1-2) is sandwiched between the bottom panel (1-1) and the bottom of the inner surface of the side panel;

[0144] The integrated cover plate assembly (11) further comprises an integrated cover plate (11-2), and the copper busbar (11-1) is positioned on the front side of the integrated cover plate (11-2);

[0145] Cover plate buckles (11-24) are provided on the front and rear sides of the integrated cover plate (11-2);

[0146] The side plate L-shaped rib (2-2) on the top of the inner surface of the side plate is snap-connected with the cover plate buckle (11-24).

[0147] The bottom of the side panel directly hooks onto the bottom panel, further reducing the assembly complexity of the battery module and improving assembly efficiency.

[0148] The snap-on connection further reduces the assembly complexity of the battery module and improves assembly efficiency.

[0149] The vertical section of the L-shaped rib of the side panel at the bottom of the inner surface of the side panel extends upward, similar to a hook, hooking the bottom panel, so that it has good mechanical bearing capacity.

[0150] Specifically, the integrated cover plate (11-2) is made of plastic.

[0151] Further, the horizontal section of the side panel L-shaped rib (2-2) at the top of the inner surface of the side panel is connected to the inner surface of the side panel, and the vertical section of the side panel L-shaped rib (2-2) at the top of the inner surface of the side panel extends downward;

[0152] The cover plate buckles (11-24) of the integrated cover plate (11-2) are arranged below the front side edge and the rear side edge of the integrated cover plate (11-2);

[0153] The front side and the rear side of the integrated cover plate (11-2) are placed on the upper end surface of the horizontal section of the side plate L-shaped rib (2-2), and the upper end surface of the cover plate buckle (11-24) of the integrated cover plate (11-2) contacts the lower end surface of the vertical section of the side plate L-shaped rib (2-2).

[0154] The cover plate buckles (11-24) and the side plate L-shaped ribs (2-2) at the top of the inner surface of the side plate realize the assembly and fixation of the cover plate and the side plate.

[0155] Furthermore, a plurality of side panel inner ribs (2-3) extending laterally are provided between the side panel L-shaped ribs (2-2) at the top and bottom of the inner surface of the side panel.

[0156] Specifically, the side panels are the front side panels (2) and the rear side panels (10). Specifically, the side panels are made of aluminum profiles, which have higher rigidity than plastics, and are specifically extruded aluminum profiles, which are conducive to manufacturing long strip side panels, improving strength, and are suitable for large battery modules formed by more battery cells.

[0157] Furthermore, the inner ribs (2-3) of the side panels are T-shaped ribs.

[0158] Specifically, the side panel L-shaped rib (2-2) and the side panel are formed integrally.

[0159] Specifically, the inner ribs (2-3) of the side panels are formed integrally with the side panels.

[0160] When the interior is filled with filling glue (such as polyurethane foam glue), the inner surface of the side panel can be firmly bonded and fixed with the filling glue because of the presence of the inner ribs (2-3) of the side panel, and the filling glue fills the gaps between the battery cells and between the battery cells and the liquid cooling plate, ultimately making the entire module have good rigidity. T-shaped ribs refer to the longitudinal section of the inner ribs (2-3) of the side panel. This type of rib with a non-pure rectangular longitudinal section can further enhance the firmness of the module, because the filling glue will be filled into the groove formed between the T-shaped rib and the inner surface of the side panel, achieving mutual contraction between the T-shaped rib and the filling glue, avoiding the disadvantage of the traditional flat plate structure and the filling glue being easily separated, enhancing the firmness of the large battery cell module structure, and enabling transportation and hoisting.

[0161] Specifically, the inner surface of the end plate has multiple

[0162] See also Fig.16 , further, the side panel L-shaped rib (2-2) at the top of the inner surface of the side panel is provided with side panel outer guide grooves (2-5) at both left and right ends;

[0163] The side plate inner ribs (2-3) on the inner surface of the side plate are provided with side plate inner guide grooves (2-4) at both left and right ends;

[0164] The upper ends of the front and rear sides of the inner surface of the end plate are provided with end plate ribs (7-4);

[0165] End plate grooves (7-6) are provided at the lower ends of the front and rear sides of the inner surface of the end plate;

[0166] The end plate sealing member is an end plate sealing strip (7-5) having a hook portion;

[0167] The side plate outer guide groove (2-5) and the side plate inner guide groove (7-4) limit the left and right movement of the end plate sealing strip (7-5);

[0168] The hook portion of the end plate sealing strip (7-5) is embedded in the end plate groove (7-6);

[0169] The side plate outer guide groove (2-5) limits the front-rear movement of the end plate ribs (7-4).

[0170] After the side plate is hooked onto the bottom plate, the end plate is directly plugged into the front and rear side plates, and the outer guide groove (2-5) of the side plate and the inner guide groove of the side plate are limited, which further reduces the assembly complexity of the battery module and improves the assembly efficiency.

[0171] It can be seen that in the battery cell module of the present invention, the installation of the bottom plate and the side plate, the installation of the end plate and the installation of the cover plate eliminates complex, time-consuming and labor-intensive fixing methods such as using bolts, thereby improving the convenience of assembling the battery cell module.

[0172] See also Fig.26 Specifically, the end plate ribs (7-4) are provided to realize assembly constraints with the side plates, and at the same time, to realize the extrusion of the contact part with the end plate sealing strip (7-5), thereby achieving a sealing effect.

[0173] The side plate outer guide groove (2-5) forms an L-shaped opening when viewed from top to bottom, and the L-shaped opening includes a first opening area and a second opening area that are connected, the first opening area is for the end plate sealing strip (7-5) to be placed, and the second opening area accommodates the end plate ribs (7-4), and the end plate ribs (7-4) are clamped between the inner surface of the side plate and the top side plate L-shaped ribs (2-2). In addition, the end plate ribs (7-4) extend into the second opening area of ​​the side plate outer guide groove (2-5) to constrain the end plate and the side plate to move along the X direction, which is the front-back direction, so that the end plate sealing strip (7-5) is compressed to achieve sealing of the front and back sides of the end plate.

[0174] Specifically, the end plate sealing strip (7-5) is made of foam material.

[0175] The front side plate (2) and the rear side plate (10) are both made of aluminum profiles, and are installed with the end plate through an ingenious structure, i.e., the L-shaped ribs (7-3) at the bottom of the side plate are hooked on the bottom plate (1-1), and the side plate outer guide grooves (2-5) and the side plate inner guide grooves (7-4) are arranged on the left and right sides of the side plate, thereby realizing the assembly of the module shell.

[0176] The end plate groove (7-6) is used to prevent the end plate sealing strip (7-5) from being peeled off due to friction during assembly.

[0177] The present invention designs a cylindrical battery mold with reliable structural strength, mature technology, stable quality, good manufacturability and safety, which meets the feasibility of component manufacturing and product assembly, is easy to assemble, and ensures quality stability.

[0178] Furthermore, the integrated cover plate assembly (11) further comprises an integrated cover plate (11-2), and the copper busbar (11-1) is positioned on the front side of the integrated cover plate (11-2);

[0179] The integrated cover plate (11-2) is provided with a plurality of welding reserved holes (11-25), each welding reserved hole being aligned with the upper end surface of a battery cell (3);

[0180] A protective thin wall (11-21) is provided at the welding reserved hole (11-25), the protective thin wall (11-21) is connected to a protective ring (11-22), and the copper bar passes through the inside of the protective ring (11-22) and is welded to the positive electrode of the battery cell (3) below.

[0181] The protective ring (11-22) and the protective thin wall (11-21) can support the area to be welded of the copper busbar to prevent the copper busbar from being squeezed by external force and causing a short circuit between the positive and negative electrodes. Furthermore, a plurality of copper busbar positioning posts (11-23) are also provided on the front of the integrated cover plate (11-2).

[0182] The inner ring of the protective ring (11-22) is aligned with the top positive electrode of the battery cell (3), and a small hole is provided on the copper busbar corresponding to the inner ring area of ​​the protective ring (11-22), so that the positive electrode of the battery cell and the copper busbar are welded together by laser.

[0183] Specifically, the protective thin wall (11-21) extends from the welding reserved hole (11-25) to the protective ring (11-22) and presents a fan-shaped shape.

[0184] The area of ​​the welding reserved hole (11-25) other than the projection area of ​​the protective thin wall (11-21) and the projection area of ​​the protective ring (11-22) corresponds to the negative electrode area of ​​the battery cell.

[0185] Specifically, a mica sheet can be pasted on the bottom of the battery cell (3). The mica sheet prevents glue from invading the explosion-proof valve of the battery cell during the battery cell assembly stage, thereby affecting its performance. It can also provide thermal insulation and safety protection for the battery cell. When a battery cell next to it emits flames due to thermal runaway, it can effectively prevent the runaway from spreading to the battery cell.

[0186] The copper bar positioning column (11-23) is used to position and install the copper bar, realize hot-melt fixation, and facilitate laser welding.

[0187] Specifically, the front and rear sides of the integrated cover plate (11-2) are also provided with a plurality of cover plate mounting holes, and the front and rear sides of the top cover (12) are also provided with top cover mounting holes corresponding to the cover plate mounting holes one by one, and the integrated cover plate (11-2) and the top cover (12) are fixed by passing fixing screws (13) through the cover plate mounting holes and the top cover mounting holes.

[0188] Specifically, the top cover (12) is made of a plastic sheet.

[0189] Specifically, the fixing screws (13) are made of plastic material, and the integrated cover plate (11-2) and the top cover (12) are fixedly installed by pressing.

[0190] Specifically, an end plate outer frame (7-3) is also provided on the top of the end plate, and a bolt fixing base (8) is provided on the end plate outer frame (7-3).

[0191] The left and right sides of the integrated cover plate (11-2) are provided with wiring harness installation holes in the areas corresponding to the end plate outer frame (7-3), and the left and right sides of the top cover (12) are provided with notches in the areas corresponding to the wiring harness installation holes to expose the wiring harness installation holes. The electrical connection and fixation of the total positive / total negative output poles of the battery are achieved by the cooperation of the fixing bolts (9) and the bolt fixing base (8).

[0192] See also Fig.42 The present invention also provides a method for assembling a large battery cell module, which is used to manufacture the aforementioned large battery cell module, comprising the following steps:

[0193] Step A1, prepare a bottom plate assembly, and place the bottom plate assembly flat on an operating table, wherein the bottom plate assembly includes a bottom plate (1-1) and bottom plate sealing members around the bottom plate (1-1);

[0194] Step A2, installing side panels on the front side and the rear side of the bottom plate assembly;

[0195] Step A3, installing end plates on the left and right sides of the bottom plate assembly, and end plate seals are provided on both the front and rear sides of each end plate. When installing, the end plate seals seal the contact between the end plate and the corresponding side plate. After installation, the bottom plate seals seal the side plate, the end plate and the bottom plate (1-1);

[0196] Step A4, injecting filling glue into the bottom plate assembly, and then placing the battery cell (3) into the front main groove (1-5) of the bottom plate (1-1);

[0197] Step A5, fixing the integrated cover plate assembly above the battery cell (3) and the side plate relative to each other, and using a laser to weld the copper busbar (11-1) on the integrated cover plate assembly and the battery cell (3);

[0198] Step A6, covering the top cover (12) on the integrated cover assembly, and fixing the top cover (12) and the integrated cover assembly together.

[0199] In step A4, specifically, half of the space surrounded by the bottom plate assembly, the side plates at the front and rear sides, and the end plates at the left and right sides is filled with filling glue, and after the glue is self-leveled, the battery cell (3) is placed in the main groove (1-5) on the front side of the bottom plate (1-1).

[0200] Furthermore, in step A2, the side panels are made of aluminum profiles.

[0201] Furthermore, the left and right sides of the bottom plate (1-1) are provided with bottom plate buckle positions (1-6);

[0202] An end plate buckle position (7-1) is provided at the lower end of the end plate;

[0203] In step A3, the end plate is fixed to the bottom plate (1-1) by means of a snap connection between the corresponding end plate buckle positions (7-1) and the bottom plate buckle positions (1-6).

[0204] Furthermore, the large battery cell module also includes a liquid cooling assembly, which is formed by connecting a liquid cooling plate (4) and a liquid cooling pipe assembly (5);

[0205] The right end plate (7) on the right side of the bottom plate (1-1) has an end plate U-shaped groove (7-2) corresponding one-to-one to the liquid cooling plate (4), and the end plate U-shaped groove (7-2) opens at the lower end of the right end plate (7);

[0206] A liquid cooling plate sealing member (4-1) is sleeved on an area of ​​the extended plate body of the liquid cooling plate (4) close to the liquid cooling pipe connecting member (4-2);

[0207] In step A3, first, the left side of the bottom plate assembly is snap-connected with the left end plate (6), and then the liquid cooling plate assembly is placed on the bottom plate (1-1). After that, the end plate U-shaped groove (7-2) of the right end plate (7) is aligned with the corresponding liquid cooling plate seal (4-1) area and moved downward, so that the area of ​​the liquid cooling plate seal (4-1) on the liquid cooling plate (4) is inserted into the corresponding end plate U-shaped groove (7-2), and the snap-connection between the right end plate (7) and the bottom plate (1-1) is achieved.

[0208] Furthermore, the bottom of the inner surface of the side panel is provided with a side panel L-shaped rib (2-2) extending in the left-right direction;

[0209] In step A2, the side panel L-shaped ribs (2-2) at the bottom of the inner surface of the side panel are hooked onto the bottom panel (1-1) to achieve the installation of the side panel onto the bottom panel assembly.

[0210] Furthermore, a side panel L-shaped rib (2-2) extending in the left-right direction is provided on the top of the inner surface of the side panel;

[0211] The integrated cover plate assembly also includes an integrated cover plate (11-2), and the front and rear sides of the integrated cover plate (11-2) are provided with cover plate buckles (11-24);

[0212] In step A5, the side panel L-shaped rib (2-2) at the top of the inner surface of the side panel and the cover panel buckle (11-24) of the integrated cover panel (11-2) are snap-fitted to achieve relative fixation of the integrated cover panel assembly and the side panel.

[0213] Furthermore, the side panel L-shaped rib (2-2) at the top of the inner surface of the side panel is provided with side panel outer guide grooves (2-5) at both left and right ends;

[0214] A plurality of side panel inner ribs (2-3) extending in the left and right directions are arranged between the side panel L-shaped ribs (2-2) at the top and bottom of the inner surface of the side panel, and the side panel inner ribs (2-3) on the inner surface of the side panel are provided with side panel inner guide grooves (2-4) at both left and right ends;

[0215] The upper ends of the front and rear sides of the inner surface of the end plate are provided with end plate ribs (7-4);

[0216] End plate grooves (7-6) are provided at the lower ends of the front and rear sides of the inner surface of the end plate;

[0217] The end plate sealing member is an end plate sealing strip (7-5) having a hook portion;

[0218] In step A3, the hook of the end plate sealing strip (7-5) is embedded in the end plate groove (7-6), and after the end plate is installed on the bottom plate (1-1), the side plate outer guide groove (2-5) and the side plate inner guide groove (7-4) limit the left and right movement of the end plate sealing strip (7-5), and the side plate outer guide groove (2-5) limits the front and rear movement of the end plate rib (7-4). The specific assembly process is described in detail as follows.

[0219] See also Figure 28-Figure 30 , indicating the installation process A-1 of the side panel (included in step A2), indicating the process of hooking the front and rear side panels onto the bottom panel assembly, the installation parts of the front side panel (10) and the rear side panel (2) are installed in sequence, the front side panel can be installed, or the rear side panel can be installed first.

[0220] join Fig.31 , indicating the installation process A-2 of the left end plate (6) (included in step A3), the left end plate (6) and the left side of the bottom plate are connected by snap fastening, and the installed structure is as follows Fig.32 shown.

[0221] join Fig.33 , indicating the installation process A-3 of the liquid cooling plate assembly (included in step A3), firstly, the liquid cooling plate (4) is connected in parallel through the liquid cooling pipe assembly (5) to form a liquid cooling plate assembly, and then placed on the bottom plate assembly.

[0222] join Fig.34 , indicating the installation process A-4 of the right end plate (7) (included in step A3), the end plate U-shaped groove of the right end plate (7) corresponds to the liquid cooling plate seal (4-1) area of ​​the liquid cooling plate, and finally the bottom plate buckle position on the right side of the bottom plate is snap-fastened and connected. The installed structure is as shown in FIG. Fig.35 shown.

[0223] See also Fig.36, indicating the installation process A-5 of the battery cell (included in step A4), injecting filling glue into the bottom plate assembly (1), and then placing the battery cell into the main groove (1-5) on the front side, and pasting mica sheets on the bottom of the battery cell (3) in advance. The structure after installation is as follows Fig.37 As shown. Different from the prior art, the present invention first injects the filling glue, which is self-leveling, to fill the front main groove, and then puts the battery cell in. The side wall secondary grooves on the front main groove (1-5) are conducive to the overflow of the filling glue in the front main groove when the battery cell is placed, so that the firmness of the battery cell and the bottom plate assembly is enhanced, and the gaps between the filling glue and the side plates, end plates, and battery cells, and the gaps between the battery cell and the liquid cooling plate, so that the firmness of the entire battery cell module is enhanced.

[0224] See also Figure 38-Figure 39 , indicating the installation process A-6 and the laser welding process A-7 (included in step A5) of the integrated cover assembly, fixing the integrated cover assembly (11) and the side plate in a snap-fit ​​manner, and laser welding the copper busbar and the electrode of the battery cell;

[0225] See also Fig.40 , indicating the installation process A-8 of the top cover (included in step A6), fixing the top cover and the integrated cover. The structure after installation is as follows Fig.41 shown.

[0226] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A large battery cell module, characterized in that: It comprises a bottom plate assembly (1), a side plate, an end plate, a battery cell (3), an integrated cover plate assembly (11) and a top cover (12); The bottom plate assembly (1) comprises a bottom plate (1-1) and bottom plate seals around the bottom plate (1-1), the side plates are provided on two opposite sides of the bottom plate (1-1) at the front and rear sides, the end plates are provided on two opposite sides of the bottom plate (1-1), and the bottom plate seals seal the side plates, the end plates and the bottom plate (1-1); End plate seals are provided on both front and rear sides of the end plate, and the end plate seals the front and rear sides of the end plate and the side plate; The front side of the bottom plate (1-1) has a plurality of front main grooves (1-5), the bottom of the battery cell (3) is positioned in the front main grooves (1-5), and the gaps between adjacent battery cells (3) are filled with filling glue; The integrated cover plate assembly (11) is provided above the battery cell (3), and the integrated cover plate assembly (11) comprises a copper busbar (1-11) electrically connected to the battery cell (3); The integrated cover plate assembly (11) is provided with the top cover (12), and the top cover (12) and the cover plate assembly (11) are fixedly connected.

2. A large battery cell module as claimed in claim 1, characterized in that: The battery cell module further comprises a liquid cooling assembly, wherein the liquid cooling assembly comprises a liquid cooling plate (4) and a liquid cooling pipe assembly (5); the liquid cooling plate (4) extends between the battery cells (3); A fluid channel is formed inside the extended plate body of the liquid cooling plate (4); The gap between the battery core (3) and the extended plate body of the liquid cooling plate (4) is filled with the filling glue; After the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) and the liquid cooling pipe assembly (5) are connected, the liquid cooling pipe assembly (5) and the fluid channel are in communication, allowing cooling fluid to enter and exit.

3. A large battery cell module as claimed in claim 2, characterized in that: The back side of the bottom plate (1-1) is provided with a back main groove (1-9); the groove bottom of the back main groove (1-9) corresponds to the groove bottom of the front main groove (1-5) in vertical correspondence and form a groove bottom thin wall (1-11); A pressure relief channel (1-8) is connected between two adjacent back main grooves (1-9) and between the left and right sides of the bottom plate (1-1) and the adjacent back main groove (1-9); The groove bottom of the back main groove (1-9) is also provided with a back secondary groove (1-12).

4. A large battery cell module as claimed in claim 3, characterized in that: The pressure relief channel (1-8) is a pressure relief notch, and the groove bottom of the portion of the pressure relief notch that is connected to the back main groove (1-9) is provided with a protruding rib (1-10) extending into the back main groove (1-9).

5. A large battery cell module as claimed in claim 2, characterized in that: An end plate buckle position (7-1) is provided at the lower end of each end plate; The bottom plate sealing member comprises a second bottom plate foam strip (1-3); The left and right sides of the bottom plate (1-1) are provided with first narrow grooves extending in the front-to-back direction, the second bottom plate foam strip (1-3) is built into the first narrow groove, and bottom plate buckles (1-6) are provided outside the first narrow groove; The end plate is fixed to the bottom plate (1-1) by means of a snap connection between the corresponding end plate buckle positions (7-1) and the bottom plate buckle positions (1-6), and the lower end surface of the end plate contacts the second bottom plate foam strip (1-3).

6. A large battery cell module as claimed in claim 5, characterized in that: The front side of the bottom plate (1-1) has a plurality of rows of front main grooves (1-5), and each row of the front main grooves (1-5) is arranged along the left-right direction of the bottom plate (1-1); The liquid cooling assembly comprises a plurality of the liquid cooling plates (4), wherein the liquid cooling plate (4) comprises an extended plate body and a liquid cooling pipe connector (4-2) at the right end, and the liquid cooling pipe connector (4-2) and the liquid cooling pipe assembly (5) are connected to form a liquid cooling plate parallel structure; The extended plate body of the liquid cooling plate (4) extends along the left-right direction between two adjacent rows of the battery cells (3) disposed in the front main groove (1-5); The right end plate (7) on the right side of the bottom plate (1-1) has an end plate U-shaped groove (7-2) corresponding one-to-one to the liquid cooling plate (4), and the end plate U-shaped groove (7-2) opens at the lower end of the right end plate (7); A liquid cooling plate sealing member (4-1) is provided in a region of the extended plate body of the liquid cooling plate (4) close to the liquid cooling pipe connecting member (4-2); The area on the liquid cooling plate (4) covered with the liquid cooling plate sealing member (4-1) is inserted into the corresponding end plate U-shaped groove (7-2); A block groove is provided in an area on the right side of the bottom plate (1-1) corresponding to the bottom of the liquid cooling plate seal (4-1), the block groove is connected to the first narrow groove, a bottom plate foam block (1-4) is provided in the block groove, and the bottom plate foam block (1-4) is in contact with the corresponding liquid cooling plate seal (4-1).

7. A large battery cell module as claimed in claim 2, characterized in that: The bottom of the inner surface of each side plate is provided with a side plate L-shaped rib (2-2) extending in the left-right direction; The bottom plate sealing member comprises a first bottom plate foam strip (1-2) extending in the left-right direction on the front side and the rear side of the bottom plate (1-1); The side panel L-shaped ribs (2-2) at the bottom of the inner surface of the side panel hook the bottom panel (1-1), and the first bottom panel foam strip (1-2) is sandwiched between the bottom panel (1-1) and the bottom of the inner surface of the side panel.

8. A large battery cell module as claimed in claim 7, characterized in that: A plurality of side panel inner ribs (2-3) extending in left-right directions are provided between the side panel L-shaped ribs (2-2) at the top and bottom of the inner surface of the side panel; The inner ribs (2-3) of the side panels are T-shaped ribs.

9. A large battery cell module as claimed in claim 7, characterized in that: The side plate L-shaped rib (2-2) at the top of the inner surface of the side plate is provided with side plate outer guide grooves (2-5) at both left and right ends; The side plate inner ribs (2-3) on the inner surface of the side plate are provided with side plate inner guide grooves (2-4) at both left and right ends; The upper ends of the front and rear sides of the inner surface of the end plate are provided with end plate ribs (7-4); The lower ends of the front and rear side edges of the inner surface of the end plate are provided with end plate grooves (7-6); The end plate sealing member is an end plate sealing strip (7-5) having a hook portion; The side plate outer guide groove (2-5) and the side plate inner guide groove (7-4) limit the left and right movement of the end plate sealing strip (7-5); The hook portion of the end plate sealing strip (7-5) is embedded in the end plate groove (7-6); The side plate outer guide groove (2-5) limits the forward and backward movement of the end plate ribs (7-4).

10. A method for assembling a large battery cell module, characterized in that: The method for manufacturing a large battery cell module as claimed in any one of claims 1 to 9 comprises the following steps: Step A1, preparing a bottom plate assembly, placing the bottom plate assembly flat on an operating table, the bottom plate assembly comprising a bottom plate (1-1) and bottom plate sealing members around the bottom plate (1-1); Step A2, installing side panels on the front side and the rear side of the bottom plate assembly; Step A3, installing end plates on the left and right sides of the bottom plate assembly, and each end plate is provided with end plate seals on both the front and rear sides of the end plates. During installation, the end plate seals seal the contact points between the end plates and the corresponding side plates. After installation, the bottom plate seals seal the side plates, the end plates and the bottom plate (1-1); Step A4, injecting filling glue into the bottom plate assembly, and then placing the battery cell (3) into the front main groove (1-5) of the bottom plate (1-1); Step A5, fixing the integrated cover plate assembly above the battery cell (3) relative to the side plate, and welding the copper busbar (11-1) on the integrated cover plate assembly and the battery cell (3) with a laser; Step A6, covering the top cover (12) on the integrated cover assembly, and fixing the top cover (12) and the integrated cover assembly together.

Images