Large battery cell module

Abstract

The utility model provides a large battery cell module, which is characterized in that a bottom plate assembly comprises a bottom plate and bottom plate sealing pieces 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 pieces; 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] This utility model relates to the field of battery pack technology, and in particular to a large cell module. Background Technology

[0002] Lithium-ion batteries have advantages such as light weight, large energy storage capacity, high power, no pollution, long lifespan, low self-discharge coefficient, and wide temperature adaptability, thus gradually gaining popularity and replacing other traditional batteries in the fields of energy storage and power batteries. Cylindrical lithium batteries are characterized by high production efficiency, low production cost, and good product consistency, thus occupying a large market share, such as the 46 series cylindrical cells.

[0003] In automotive battery pack applications, modules are commonly used for design. However, due to limitations such as energy density, structural strength, reliability, manufacturing feasibility, and cost constraints, 46-series cylindrical cells typically employ foamed adhesive structures to meet these design goals. However, the foaming process places high demands on structural design (e.g., uniform adhesive distribution is required to ensure adequate filling within the module), resulting in generally complex module designs. Furthermore, some immature technologies are often present (e.g., inability to effectively control adhesive overflow during foaming, inability to guarantee satisfactory adhesive filling rates, and insufficient overall rigidity of the module), hindering large-scale application in automotive battery packs. Utility Model Content

[0004] Based on the above, this utility model provides a large battery cell module, aiming to solve technical problems such as glue overflow in the existing battery cell module.

[0005] A large battery cell module includes a base plate assembly, side plates, end plates, battery cells, an integrated cover plate assembly, and a top cover;

[0006] The base plate assembly includes a base plate and base plate seals around the base plate. Side plates are provided on the front and rear opposite sides of the base plate, and end plates are provided on the left and right opposite sides of the base plate. The base plate seals seal the side plates, end plates and base plate.

[0007] End plate seals are provided on the front and rear sides of the end plate, which seal the front and rear sides of the end plate and the side plate.

[0008] The front of the base plate has several main grooves, the bottom of the battery cell is positioned in the main groove, and the gap between adjacent battery cells is filled with filler glue.

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

[0010] The integrated cover assembly has a top cover, and the top cover and the cover 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] Fluid channels are formed inside the extended plate of the liquid cooling plate;

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

[0014] After the liquid cooling plate is connected to the liquid cooling pipe connector and the liquid cooling pipe assembly, the liquid cooling pipe assembly and the fluid channel are connected to allow the cooling fluid to enter and exit.

[0015] Furthermore, the back of the base plate is provided with a back main groove; the bottom of the back main groove and the bottom of the front main groove correspond vertically and form a thin wall at the bottom of the groove;

[0016] There are pressure relief channels connecting the two adjacent main back grooves, the left and right sides of the bottom plate, and the adjacent main back grooves.

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

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

[0019] Furthermore, each end plate has an end plate fastener at its lower end;

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

[0021] The left and right sides of the base plate are provided with a first slot extending in the front-to-back direction. The first slot contains a second base plate foam strip, and the outside of the first slot is provided with a base plate fastener.

[0022] The end plate is fixed to the bottom plate by the corresponding end plate fastener and bottom plate fastener, and the lower end face of the end plate contacts the second bottom plate foam strip.

[0023] Furthermore, the front of the base plate has several rows of main grooves, and each row of main grooves is arranged along the left and right direction of the base plate.

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

[0025] The extension plate of the liquid cooling plate extends in the left-right direction between the two adjacent rows of cells (3) placed in the main groove on the front.

[0026] The right end plate on the right side of the base plate has a U-shaped groove that corresponds one-to-one with the liquid cooling plate, and the U-shaped groove is open at the lower end of the right end plate.

[0027] The area of ​​the extended plate of the liquid cooling plate near the liquid cooling pipe connector is fitted with a liquid cooling plate seal.

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

[0029] Furthermore, the sidewall of the main groove on the front is provided with at least one secondary groove on the sidewall, which extends from the bottom of the sidewall of the main groove on the front to the top edge of the sidewall of the main groove on the front.

[0030] Furthermore, the two adjacent rows of front main grooves are staggered, and the extension plate of the liquid cooling plate has a wave shape that matches the shape of the outer side of the battery cell.

[0031] Furthermore, a block-shaped groove is provided on the right side of the base plate, corresponding to the bottom of the liquid cooling plate seal. The block-shaped groove is connected to the first slot. A base plate foam block is provided in the block-shaped groove, and the base plate foam block is in contact with the corresponding liquid cooling plate seal.

[0032] Furthermore, each side plate has an L-shaped rib extending in the left-right direction at the bottom of its inner surface.

[0033] The base plate seal includes a first base plate foam strip extending in the left and right directions on the front and rear sides of the base plate;

[0034] The L-shaped ribs on the bottom of the inner surface of the side plate hook onto the bottom plate, and the first bottom plate foam strip is sandwiched between the bottom plate and the bottom of the inner surface of the side plate.

[0035] Furthermore, each side plate also has L-shaped ribs extending in the left and right directions at the top of its inner surface.

[0036] The integrated cover assembly also includes an integrated cover, with copper busbars positioned on the front of the integrated cover;

[0037] The integrated cover plate has cover plate buckles on the front and rear sides;

[0038] The L-shaped ribs on the top of the inner surface of the side panel and the cover plate are snapped together.

[0039] Furthermore, several side plate inner ribs extending in the left and right directions are provided between the top and bottom L-shaped ribs of the side plate inner surface.

[0040] Furthermore, the inner reinforcement bars of the side plates are T-shaped reinforcement bars.

[0041] Furthermore, the L-shaped ribs on the top of the inner surface of the side plate are provided with external guide grooves at both the left and right ends;

[0042] The inner ribs on the inner surface of the side plate have inner guide grooves at both ends;

[0043] End plate ribs are provided at the upper ends of the front and rear sides of the inner surface of the end plate;

[0044] The lower ends of the front and rear sides of the inner surface of the end plate are provided with end plate grooves;

[0045] The end plate seal is an end plate sealing strip with hooks;

[0046] The outer guide groove and inner guide groove of the side plate limit the left and right movement of the end plate sealing strip;

[0047] The hook of the end plate sealing strip is embedded in the groove of the end plate;

[0048] The outer guide groove of the side plate limits the forward and backward movement of the end plate ribs.

[0049] Furthermore, the integrated cover assembly also includes an integrated cover, with copper busbars positioned on the front of the integrated cover;

[0050] The integrated cover plate has several welding pre-drilled holes, each of which is aligned with the upper end face of a battery cell.

[0051] A protective thin wall is provided at the welding pre-drilled hole, and a protective ring is connected to the protective thin wall. The copper busbar is welded to the positive terminal of the battery cell below through the inside of the protective ring. Furthermore, several copper busbar positioning posts are also provided on the front side of the integrated cover plate.

[0052] The beneficial technical effects of this utility model are as follows: the bottom plate seals the four sides of the bottom plate, the side plates, and the end plates, and the end plate seals the contact points between the end plates and the side plates, so that the bottom and the four sides of the large battery cell module are sealed. When the internal filling glue (such as polyurethane foam) is filled, the disadvantages such as glue leakage, multiple glue overflows, and low foaming filling yield when using foam are avoided. Attached Figure Description

[0053] Figure 1 This is a front view of the assembly diagram of a large battery cell module according to the present invention;

[0054] Figure 2 This is a schematic diagram of the assembly of a large battery cell module on the back side according to the present invention;

[0055] Figure 3 This is an exploded view of the rear assembly of a large battery cell module according to this utility model;

[0056] Figure 4 This is a schematic diagram of the front of a large battery cell module base plate assembly according to the present invention;

[0057] Figure 5 This is a schematic diagram of the back side of a large battery cell module base plate assembly according to the present invention;

[0058] Figure 6 This is an exploded view of a large battery cell module base plate assembly according to this utility model;

[0059] Figure 7-8 This is a partial schematic diagram of the front of a large battery cell module base plate assembly according to the present invention;

[0060] Figure 9 This is a partial schematic diagram of the back of a large battery cell module base plate assembly according to the present invention;

[0061] Figure 10 This is a schematic diagram of the outer surface of the right end plate of a large battery cell module according to this utility model;

[0062] Figure 11 This is a schematic diagram of the inner surface of the right end plate of a large battery cell module according to this utility model;

[0063] Figure 12 This is an exploded view of the right end plate of a large battery cell module according to this utility model;

[0064] Figure 13 This is a schematic diagram of the outer surface of the side plate of a large battery cell module according to the present invention;

[0065] Figure 14 This is a schematic diagram of the inner surface of the side plate of a large battery cell module according to the present invention;

[0066] Figure 15 This is a side view of a large battery cell module side plate according to the present invention;

[0067] Figure 16 This is a partial schematic diagram of the inner surface of the side plate of a large battery cell module according to this utility model;

[0068] Figure 17 This is an assembly drawing of an integrated cover plate assembly for a large battery cell module according to the present invention;

[0069] Figure 18 This is an exploded view of an integrated cover plate assembly for a large battery cell module according to this utility model;

[0070] Figures 19-20 This is a partial schematic diagram of an integrated cover plate assembly for a large battery cell module according to this utility model;

[0071] Figure 21 This is a schematic diagram of the snap-fit ​​connection between the cover plate and side plate of a large battery cell module according to this utility model;

[0072] Figure 22 This is a schematic diagram of a liquid cooling plate for a large battery cell module according to the present invention;

[0073] Figure 23 This is a schematic diagram of a large battery cell module where the cell undergoes thermal runaway and breaks through the thin wall at the bottom of the slot, according to this utility model.

[0074] Figure 24 This is a schematic diagram of the diffusion of thermal runaway gas along the pressure relief channel in a large battery cell module according to this utility model;

[0075] Figure 25 This is a schematic diagram of the installation of the cell end plate, bottom plate, side plate, and liquid cooling plate assembly of a large cell module according to this utility model;

[0076] Figure 26 This is a schematic diagram of the end plate and side plate limiting constraints of a large battery cell module according to this utility model;

[0077] Figure 27 This is a schematic diagram of the end plate and bottom plate limiting constraints of a large battery cell module according to this utility model;

[0078] Figures 28-41 This is a schematic diagram of the assembly process of a large battery cell module according to the present invention.

[0079] Among them, 1-base plate assembly; 1-1-base plate; 1-2-first base plate foam strip; 1-3-second base plate foam strip; 1-4-base plate foam block; 1-5-front main groove; 1-6-base plate fastener; 1-7-side wall secondary groove; 1-8-pressure relief channel; 1-9-back main groove; 1-10-protruding rib; 1-11-bottom thin wall of groove; 1-12-back secondary groove; 2-front side plate; 2-1-side plate mounting component; 2-2-side plate L-shaped rib; 2-3-side plate inner rib; 2-4-side plate inner guide groove; 2-5-side plate 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 fastener; 7-2-End plate U-groove; 7-3-End plate outer frame; 7-4-End plate rib; 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 plate assembly; 11-1-Copper busbar; 11-2-Integrated cover plate; 11-21-Protective thin wall; 11-22-Protective ring; 11-23-Copper busbar positioning post; 11-24-Cover plate buckle; 11-25-Welding pre-drilled hole; 12-Top cover; 13-Fixing screw. Detailed Implementation

[0080] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0081] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0082] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention.

[0083] See Figure 3 and Figure 8 This utility model provides a large battery cell module, including a base plate assembly (1), a side plate, an end plate, a battery cell (3), an integrated cover plate assembly (11), and a top cover (12);

[0084] The base plate assembly (1) includes a base plate (1-1) and base plate seals around the base plate (1-1). The base plate (1-1) has side plates on the front and rear opposite sides and end plates on the left and right opposite sides. The base plate seals seal the side plates, end plates and base plate (1-1).

[0085] End plate seals are provided on the front and rear sides of the end plate, which seal the front and rear sides of the end plate and the side plate.

[0086] The front side of the base plate (1-1) has several front main grooves (1-5), the bottom of the battery cell (3) is positioned in the front main groove (1-5), and the gap between adjacent battery cells (3) is filled with filler glue.

[0087] An integrated cover plate assembly (11) is provided above the battery cell (3), and the integrated cover plate assembly (11) includes a copper busbar (11-1) electrically connected to the battery cell (3);

[0088] The integrated cover assembly (11) is provided with a top cover (12), and the top cover (12) and the integrated cover assembly (11) are fixedly connected.

[0089] This utility model features a main groove on the front. During installation, filler adhesive is applied first, followed by the installation of the battery cells. The filler adhesive self-levels, covering the groove and filling the gaps between the battery cells, as well as the gaps between the battery cells and the side and end plates, further increasing the module's strength. The front, back, left, right, top (front and top), and bottom (back and bottom) of this utility model are designed according to... Figure 3 The exploded view shown is designated to indicate the direction the viewer is looking. Figure 3 The direction of the explosion diagram is: front refers to the opposite direction from back, and left refers to the direction the viewer is looking. Figure 3 In an exploded view, the left side indicates the direction the viewer is looking, and the right side indicates the direction the viewer is looking. Figure 3 In an exploded view, the direction on the right is where the viewer is looking; "up" refers to the direction the viewer is looking. Figure 3 The direction the exploded image points upwards, and the direction below indicates the viewer's gaze. Figure 3 The direction the head is pointing downwards in the exploded view.

[0090] This utility model achieves sealing of the four sides of the bottom plate (1-1), the two front and rear side plates, and the two left and right end plates through the bottom plate sealing component. The end plate sealing component seals the contact points between the end plates and the side plates, so that the bottom and the four sides of the large battery cell module are sealed. When the internal filling glue (such as polyurethane foam) is filled, it avoids the disadvantages of glue leakage, multiple glue overflows, and low foaming filling yield when using foam.

[0091] Specifically, the base plate seal is made of foam.

[0092] Specifically, the end plate seal is made of foam.

[0093] Specifically, the battery cell (3) is a cylindrical battery cell, such as the cylindrical battery cell of the 46 series, and the main groove (1-5) on the front is a cylindrical groove that matches the outer circumferential side of the battery cell (3).

[0094] Specifically, the base plate (1-1) is manufactured using plastic injection molding.

[0095] See Figure 13 Specifically, the outer surfaces of the side panels, such as the front side panel (2) and the rear side panel (10), are provided with at least two side panel mounting pieces (2-1) arranged in the left-right direction. The side panel mounting pieces (2-1) are provided with screw holes, thereby fixing the entire large battery cell module and external equipment, thus completing the installation and fixing of the entire module.

[0096] See Figure 1 , Figure 2 and Figure 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);

[0097] Fluid channels are formed inside the extended plate of the liquid cooling plate (4);

[0098] The gap between the battery cell (3) and the extended plate of the liquid cooling plate (4) is filled with filler glue;

[0099] After the liquid cooling pipe connector (4-2) and the liquid cooling pipe assembly (5) of the liquid cooling plate (4) are connected, the liquid cooling pipe assembly (5) and the fluid channel are connected to allow the cooling fluid to enter and exit.

[0100] Specifically, the liquid cooling pipe assembly (5) includes an inlet pipe and an outlet pipe. The liquid cooling plate (4) has an inlet connector and an outlet connector on its liquid cooling pipe connector (4-2) to enable the coolant to enter the fluid channel and exit from the fluid channel.

[0101] When there are more than three rows of battery cells (3), a liquid cooling plate (4) can be arranged between two adjacent rows of battery cells. Multiple liquid cooling plates (4) can be connected in parallel through the connection of liquid cooling pipe connector (4-2) and liquid cooling pipe assembly (5) to achieve uniform heat dissipation of battery cells (3).

[0102] See Figure 4 , Figure 5 , Figure 9 and Figures 23-24 Furthermore, the back of the base plate (1-1) is provided with a back main groove (1-9); the bottom of the back main groove (1-9) and the bottom of the front main groove (1-5) correspond vertically to form a groove bottom thin wall (1-11);

[0103] There are pressure relief channels (1-8) connecting the two adjacent back main grooves (1-9), the left and right sides of the bottom plate (1-1), and the adjacent back main grooves (1-9).

[0104] Specifically, the bottom of the main groove on the back (1-9) corresponds vertically to the bottom of the main groove on the front (1-5) and has the same size, forming a thin wall (1-11) at the bottom of the groove. This makes it easy for the cell (3) to break through the thin wall (1-11) at the bottom of the groove and release gas along the pressure relief channel (1-8) when thermal runaway occurs. Furthermore, a secondary groove (1-12) is also formed at the bottom of the main groove on the back (1-9).

[0105] When the cell (3) thermally fails and ejects gas, the secondary groove (1-12) on the back makes the bottom wall of the groove thinner in a local area, making it easier to break through the bottom wall (1-11). The pressure relief channel (1-8) ensures that the structure can release gas quickly to prevent high pressure accumulation from causing the module to explode.

[0106] Specifically, the secondary grooves (1-12) on the back are herringbone shaped.

[0107] Furthermore, the pressure relief channel (1-8) is a pressure relief groove, and the bottom of the pressure relief groove connected to the main groove on the back (1-9) is provided with protruding ribs (1-10) extending into the main groove on the back (1-9).

[0108] The protruding ribs (1-10) are used to provide mechanical support for the battery cell in the direction of gravity after the battery cell fails due to thermal failure and breaks through the thin wall, which can prevent the battery cell from falling off the back of the base plate (1-1).

[0109] The bottom of the module is equipped with a pressure relief structure and exhaust channel for cell explosion prevention, to prevent energy accumulation from causing an explosion.

[0110] Specifically, the front main groove (1-5) and the back main groove (1-9) are cylindrical with corresponding upper and lower sections. When the two rows of back main grooves (1-9) are staggered, each back main groove (1-9) is adjacent to six back main grooves (1-9), forming six pressure relief slots. The protruding ribs (1-10) at the bottom of the three non-adjacent pressure relief slots extend into the back main groove (1-9), and the protruding ribs (1-10) at the bottom of the other three non-adjacent pressure relief slots extend into the corresponding back main grooves (1-9) adjacent to them. In this way, each back main groove (1-9) only needs a few evenly distributed protruding ribs (1-10) to support the weight of the battery cell.

[0111] The pressure relief slots of the main back grooves (1-9) in the same row, and the pressure relief channels (1-8) between the main back grooves (1-9) near the left and right sides of the bottom plate (1-1) and the adjacent sides of the bottom plate (1-1) are arranged in a row along the left and right direction. The row arrangement of the pressure relief channels facilitates the rapid discharge of thermal runaway gas from the left and right sides of the bottom plate (1-1).

[0112] See Figure 6 and Figure 7 Furthermore, each end plate has an end plate fastener (7-1) at its lower end;

[0113] The base plate seal includes a second base plate foam strip (1-3);

[0114] The left and right sides of the base plate (1-1) are provided with a first slot extending in the front-back direction, the first slot is provided with a second base plate foam strip (1-3), and the outside of the first slot is provided with a base plate fastener (1-6).

[0115] The end plate is fixed to the bottom plate (1-1) by the snap-fit ​​connection of the corresponding end plate buckle (7-1) and bottom plate buckle (1-6), and the lower end face of the end plate contacts the second bottom plate foam strip (1-3).

[0116] The base plate (1-1) and the end plate are connected by snap-fit ​​connections between the end plate snap-fit ​​(7-1) and the base plate snap-fit ​​(1-6) to achieve assembly and fixation between the base plate and the end plate. The snap-fit ​​design simplifies the assembly process and improves efficiency.

[0117] Specifically, the base plate fastener (1-6) is an open-shaped fastener, and the end plate fastener (7-1) is a protruding block-shaped fastener. The protruding block-shaped fastener is inserted into the base plate fastener (1-6) which is an open-shaped fastener to achieve a snap-fit ​​connection.

[0118] The snap-fit ​​connection between the base plate and the end plate allows for quick installation, reducing the installation complexity of traditional battery cell modules and improving module efficiency.

[0119] Specifically, the end plate fastener (7-1) is located at the lower end of the outer surface of the end plate.

[0120] See Figure 27 The end plate and the bottom plate are connected by a snap-fit ​​to constrain the movement of the end plate in the Z direction, which is the up and down direction, so that the bottom second bottom plate foam strip (1-3) is compressed to achieve sealing on the left and right sides of the bottom plate.

[0121] See Figures 10-12 Furthermore, the front side of the base plate (1-1) has several rows of front main grooves (1-5), and each row of front main grooves (1-5) is arranged along the left and right direction of the base plate (1-1).

[0122] The liquid cooling assembly includes multiple liquid cooling plates (4), each liquid cooling plate (4) includes an extension 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 parallel structure of liquid cooling plates;

[0123] The extension plate of the liquid cooling plate (4) extends in the left and right direction between the two adjacent rows of cells (3) placed in the main groove (1-5) on the front side; the right end plate (7) on the right side of the bottom plate (1-1) has an end plate U-shaped groove (7-2) that corresponds one-to-one with the liquid cooling plate (4), and the end plate U-shaped groove (7-2) is open at the lower end of the right end plate (7);

[0124] The extended plate of the liquid cooling plate (4) is fitted with a liquid cooling plate seal (4-1) in the area near the liquid cooling pipe connector (4-2);

[0125] The area on the liquid cooling plate (4) fitted with the liquid cooling plate seal (4-1) is inserted into the corresponding end plate U-shaped groove (7-2).

[0126] The liquid cooling plate seal (4-1) is made of foam material, for example. The end plate is sealed by the extrusion between the end plate U-shaped groove (7-2) and the liquid cooling plate seal (4-1), which seals the extension of the liquid cooling plate (4) inside and the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) outside, thereby avoiding situations such as glue overflow.

[0127] The difference between the left end plate (6) and the right end plate (7) is that the right end plate (7) has an added end plate U-shaped groove (7-2) to facilitate assembly with the liquid cooling plate assembly. Both end plates are made of plastic.

[0128] Specifically, the sidewall of the U-shaped groove (7-2) of the end plate has sidewall ribs, which can achieve sealing at this point by squeezing the liquid cooling plate seal (4-1) on the liquid cooling plate (4) by the sidewall ribs.

[0129] Specifically, the base plate (1-1) can be assembled from multiple unit base plate panels.

[0130] Furthermore, the sidewall of the main groove (1-5) is provided with at least one sidewall secondary groove (1-7), which extends from the bottom of the sidewall of the main groove (1-5) to the top edge of the sidewall of the main groove (1-5).

[0131] As a preferred embodiment, four secondary sidewall grooves (1-7) are evenly distributed on the sidewall of the main groove (1-5) on the front side. The secondary sidewall grooves (1-7) create a larger gap between the sidewall of the battery cell and the main groove (1-5) in a local area. During the battery cell assembly process, the filler is filled first and then the battery cell is placed in, which facilitates the discharge of the filler from the main groove on the front side.

[0132] Unlike existing technologies, this invention first injects filler adhesive, which self-levels and fills the main groove on the front side before placing the battery cell in. The secondary grooves on the side walls of the main groove (1-5) on the front side facilitate the overflow of filler adhesive from the main groove when the battery cell is placed in, thereby enhancing the robustness of the battery cell and the base plate assembly. The gaps between the filler adhesive and the side plates, end plates, and battery cells, as well as the gaps between the battery cell and the liquid cooling plate, further enhance the robustness of the entire battery cell module.

[0133] Furthermore, the two adjacent rows of front main grooves (1-5) are staggered, and the extension plate of the liquid cooling plate has a wave shape that matches the outer side of the battery cell (3).

[0134] By matching the shape and increasing the heat dissipation area, uniform heat dissipation of the battery cell is achieved, thereby improving heat dissipation efficiency.

[0135] See Figure 25 Furthermore, a block-shaped groove is provided on the right side of the base plate (1-1) in the area corresponding to the bottom of the liquid-cooled plate seal (4-1). The block-shaped groove is connected to the first slot, and a base plate foam block (1-4) is provided in the block-shaped groove. The base plate foam block (1-4) contacts the corresponding liquid-cooled plate seal (4-1). The contact between the base plate foam block (1-4) and the liquid-cooled plate seal (4-1) achieves a seal.

[0136] See Figures 14-15 and Figure 21 Furthermore, each side plate has L-shaped ribs (2-2) extending in the left and right directions at the bottom and top of its inner surface;

[0137] The front and rear sides of the base plate (1-1) are provided with first base plate foam strips (1-2) extending in the left and right directions;

[0138] The L-shaped rib (2-2) of the side plate at the bottom of the inner surface of the side plate hooks onto the bottom plate (1-1), and the first bottom plate foam strip (1-2) is sandwiched between the bottom plate (1-1) and the bottom of the inner surface of the side plate.

[0139] The integrated cover assembly (11) also includes an integrated cover (11-2), with a copper busbar (11-1) positioned on the front of the integrated cover (11-2);

[0140] The integrated cover plate (11-2) is provided with cover plate buckles (11-24) on the front and rear sides;

[0141] The L-shaped ribs (2-2) on the top of the inner surface of the side plate are snapped together with the cover plate clips (11-24).

[0142] The bottom of the side plate directly hooks onto the base plate, further reducing the assembly complexity of the battery cell module and improving assembly efficiency.

[0143] The snap-fit ​​connection further reduces the assembly complexity of the battery cell module and improves assembly efficiency.

[0144] The vertical section of the L-shaped rib at the bottom of the inner surface of the side plate extends upward, similar to a hook, hooking the bottom plate, thus providing excellent mechanical load-bearing capacity.

[0145] Specifically, the integrated cover plate (11-2) is made of plastic.

[0146] Furthermore, the horizontal segment of the L-shaped rib (2-2) at the top of the inner surface of the side plate is connected to the inner surface of the side plate, and the vertical segment of the L-shaped rib (2-2) at the top of the inner surface of the side plate extends downward.

[0147] The cover plate buckle (11-24) of the integrated cover plate (11-2) is located below the front and rear sides of the integrated cover plate (11-2);

[0148] The front and rear sides of the integrated cover plate (11-2) are placed on the upper end face of the horizontal section of the side plate L-shaped rib (2-2), and the upper end face of the cover plate buckle (11-24) of the integrated cover plate (11-2) is in contact with the lower end face of the vertical section of the side plate L-shaped rib (2-2).

[0149] The cover plate clips (11-24) and the L-shaped ribs (2-2) on the top of the inner surface of the side plate achieve the assembly and fixation of the cover plate and the side plate.

[0150] Furthermore, several transversely extending inner side plate ribs (2-3) are provided between the top and bottom L-shaped ribs (2-2) of the inner surface of the side plate.

[0151] Specifically, the side panels are a front side panel (2) and a rear side panel (10). Specifically, the side panels adopt an aluminum profile structure. Aluminum profiles have higher rigidity than plastics. Specifically, they are extruded aluminum profiles, which are conducive to manufacturing long strip side panels, improving strength, and are suitable for large battery cell modules formed by more battery cells.

[0152] Furthermore, the inner reinforcing bars (2-3) of the side plate are T-shaped reinforcing bars.

[0153] Specifically, the L-shaped ribs (2-2) of the side plate are integrally formed with the side plate.

[0154] Specifically, the inner stiffeners (2-3) of the side plate are integrally formed with the side plate.

[0155] After the internal filling adhesive (such as polyurethane foam) is applied, the inner surface of the side plate can be reliably bonded and fixed to the adhesive due to the presence of the inner ribs (2-3). Furthermore, the adhesive fills the gaps between the battery cells and between the battery cells and the liquid cooling plate, ultimately giving the entire module good rigidity and strength. The T-shaped ribs refer to the T-shaped longitudinal section of the inner ribs (2-3). These ribs, with non-pure rectangular longitudinal sections, further enhance the module's robustness because the adhesive fills the groove formed between the T-shaped ribs and the inner surface of the side plate, achieving mutual support between the T-shaped ribs and the adhesive. This avoids the drawback of traditional flat structures easily detaching from the adhesive, enhancing the structural strength of the large battery cell module and enabling handling and hoisting.

[0156] Specifically, the inner surface of the end plate has multiple

[0157] See Figure 16 Furthermore, the L-shaped ribs (2-2) on the top of the inner surface of the side plate are provided with outer guide grooves (2-5) at both the left and right ends;

[0158] The inner ribs (2-3) on the inner surface of the side plate are provided with inner guide grooves (2-4) at both the left and right ends;

[0159] 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);

[0160] The lower ends of the front and rear sides of the inner surface of the end plate are provided with end plate grooves (7-6);

[0161] The end plate seal is an end plate sealing strip (7-5) with hooks;

[0162] The outer guide groove (2-5) and the inner guide groove (7-4) of the side plate limit the left and right movement of the end plate sealing strip (7-5);

[0163] The hook of the end plate sealing strip (7-5) is embedded in the end plate groove (7-6);

[0164] The side plate outer guide groove (2-5) limits the forward and backward movement of the end plate ribs (7-4).

[0165] After the side plate hooks onto the base plate, the end plate directly connects to the front and rear side plates. The outer guide groove (2-5) and inner guide groove of the side plate limit the assembly, further reducing the assembly complexity of the battery cell module and improving the assembly efficiency.

[0166] As can be seen, in the battery cell module of this utility model, the installation of the base plate and side plate, the installation of the end plate and the installation of the cover plate eliminate the need for complex, time-consuming and labor-intensive fixing methods such as using bolts, thereby improving the convenience of battery cell module assembly.

[0167] See Figure 26 Specifically, the end plate ribs (7-4) are designed to provide assembly constraints with the side plates, and to compress the contact area with the end plate sealing strip (7-5) to achieve a sealing effect.

[0168] The side plate outer guide groove (2-5) forms an L-shaped opening when viewed from top to bottom. 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 inserted, and the second opening area accommodates the end plate rib (7-4). The end plate rib (7-4) is held between the inner surface of the side plate and the L-shaped rib (2-2) of the top side plate. In addition, the end plate rib (7-4) extends into the second opening area of ​​the side plate outer guide groove (2-5) and constrains the end plate and side plate to move in the X direction, which is the front-back direction. This causes the end plate sealing strip (7-5) to be compressed, thereby achieving a seal on both the front and back sides of the end plate.

[0169] Specifically, the end plate sealing strip (7-5) is made of foam.

[0170] Both the front side panel (2) and the rear side panel (10) are made of aluminum profiles. The bottom side panel L-shaped ribs (7-3) hook the bottom plate (1-1) through a clever structure, and the side panel outer guide grooves (2-5) and side panel inner guide grooves (7-4) set on the left and right sides of the side panel are used to install with the end plate, thereby realizing the assembly of the module shell.

[0171] 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 the assembly process.

[0172] This invention designs a cylindrical battery mold with reliable structural strength, mature technology, stable quality, good manufacturability, and safety. It satisfies the feasibility of component manufacturing and product assembly, is easy to assemble, and ensures the stability of quality.

[0173] Furthermore, the integrated cover assembly (11) also includes an integrated cover (11-2), with a copper busbar (11-1) positioned on the front of the integrated cover (11-2);

[0174] The integrated cover plate (11-2) has several welding pre-drilled holes (11-25), each welding pre-drilled hole is aligned with the upper end face of a battery cell (3);

[0175] A protective thin wall (11-21) is provided at the welding reserved hole (11-25). A protective ring (11-22) is connected to the protective thin wall (11-21). The copper busbar is welded to the positive electrode of the battery cell (3) below through the inner ring of the protective ring (11-22).

[0176] The protective ring (11-22) and the protective thin wall (11-21) can support the area of ​​the copper busbar to be welded, preventing the copper busbar from being squeezed by external force and causing a short circuit between the positive and negative poles. Furthermore, the front of the integrated cover plate (11-2) is also provided with several copper busbar positioning posts (11-23).

[0177] The inner part of the protective ring (11-22) is aligned with the top positive electrode of the battery cell (3). Small holes are provided on the copper busbar corresponding to the inner area of ​​the protective ring (11-22) so that the positive electrode of the battery cell and the copper busbar can be welded together by laser.

[0178] Specifically, the protective thin wall (11-21) extends from the welding pre-drilled hole (11-25) to the protective ring (11-22), presenting a fan shape.

[0179] The area of ​​the welding pre-drilled hole (11-25), excluding 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.

[0180] Specifically, mica sheets can be pasted on the bottom of the battery cell (3). The mica sheets prevent glue from entering the explosion-proof valve of the battery cell during the battery cell assembly stage, which would affect its performance. They can also provide heat insulation safety protection for the battery cell. When a neighboring battery cell emits flames due to thermal runaway, the mica sheets can effectively prevent the runaway from spreading to that battery cell.

[0181] Copper busbar positioning posts (11-23) are used to position and install copper busbars, achieving hot-melt fixation and facilitating laser welding.

[0182] Specifically, the front and rear sides of the integrated cover plate (11-2) are provided with several cover plate mounting holes, and the front and rear sides of the top cover (12) are provided with top cover mounting holes that correspond one-to-one with the cover plate mounting holes. The integrated cover plate (11-2) and the top cover (12) are fixed by passing the fixing screws (13) through the cover plate mounting holes and the top cover mounting holes.

[0183] Specifically, the top cover (12) is made of plastic sheet.

[0184] Specifically, the fixing screws (13) are made of plastic and are used to fix the integrated cover plate (11-2) and the top cover (12) by pressing.

[0185] Specifically, the top of the end plate is also provided with an end plate outer frame (7-3), and a bolt fixing base (8) is provided on the end plate outer frame (7-3).

[0186] The left and right sides of the integrated cover plate (11-2) are provided with wiring harness mounting holes in the area corresponding to the outer frame of the end plate (7-3), and the left and right sides of the top cover (12) are provided with notches in the area corresponding to the wiring harness mounting holes to expose the wiring harness mounting holes. The electrical connection and fixation of the battery's total positive / total negative output terminals are achieved by the cooperation of the fixing bolts (9) and the bolt fixing base (8).

[0187] The assembly process of this utility model's large battery cell module mainly includes the following steps:

[0188] Step A1: Prepare the base plate assembly (1) and place the base plate assembly (1) flat on the operating table;

[0189] Step A2: Install side plates on the front and rear sides of the base plate assembly (1);

[0190] Step A3: Fix the left end plate (6) to the left side of the base plate assembly (1) and fix the right end plate (7) to the right side of the base plate assembly (1);

[0191] Step A4: Inject filler glue into the base plate assembly (1), and then place the battery cell into the front main groove (1-5);

[0192] Step A5: Install the integrated cover plate assembly (11) above the battery cell (3) and weld the copper busbar and the battery cell using a laser;

[0193] Step A6: Cover the top cover (12) onto the integrated cover assembly (11) and fix the top cover (12) and the integrated cover assembly (11) together.

[0194] In step A4, specifically, half of the accommodating space formed by the base plate assembly, the front and rear side plates, and the end plates on the left and right sides is filled with filler glue. After the glue self-levels, the battery cell (3) is placed into the main groove (1-5) on the front of the base plate (1-1).

[0195] The specific assembly process is explained in detail below.

[0196] See Figures 28-30 , indicates the installation process of the side panel A-1 (included in step A2), indicates the process of hooking the front and rear side panels onto the base plate assembly, the installation of the front side panel (10) and the rear side panel (2) are sequential, the front side panel can be installed, or the rear side panel can be installed first.

[0197] join Figure 31 The following describes the installation process of the left end plate (6) A-2 (included in step A3), in which the left end plate (6) and the left side of the base plate are fastened together with snap fasteners. The completed structure is as follows: Figure 32 As shown.

[0198] join Figure 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 the liquid cooling plate assembly, and then placed on the base plate assembly.

[0199] join Figure 34 The installation process of the right end plate (7) is shown in A-4 (included in step A3). The U-shaped groove of the right end plate (7) corresponds to the liquid cooling plate seal (4-1) area of ​​the liquid cooling plate. Finally, it is snapped and fixed to the bottom plate buckle on the right side of the bottom plate. The completed structure is as follows: Figure 35 As shown.

[0200] See Figure 36 The process A-5, which involves installing the battery cell (included in step A4), involves injecting filler adhesive into the base plate assembly (1), then placing the battery cell into the main groove (1-5) on the front side. Mica sheets are pre-attached to the bottom of the battery cell (3). The completed structure is as follows: Figure 37 As shown. Unlike existing technologies, this invention first injects filler adhesive, which self-levels and fills the main groove on the front side, before placing the battery cell inside. The secondary grooves on the side walls of the main groove (1-5) on the front side facilitate the overflow of filler adhesive from the main groove when the battery cell is placed inside, thereby enhancing the robustness of the battery cell and the base plate assembly. The gaps between the filler adhesive and the side plates, end plates, and battery cells, as well as the gaps between the battery cell and the liquid cooling plate, further enhance the robustness of the entire battery cell module.

[0201] See Figures 38-39 , indicating the installation process A-6 and laser welding process A-7 of the integrated cover plate assembly (included in step A5), the integrated cover plate assembly (11) and the side plate are fixed by snap-fit, and the copper busbar and the electrode of the battery cell are laser welded;

[0202] See Figure 40 This indicates the installation process A-8 of the top cover (included in step A6), which involves securing the top cover and the integrated cover plate. The completed structure is as follows: Figure 41 As shown.

[0203] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A large battery cell module, characterized in that, Includes base plate assembly (1), side plate, end plate, and battery cell (3); The base plate assembly (1) includes a base plate (1-1) and base plate seals around the base plate (1-1). The base plate (1-1) has side plates on its front and rear opposite sides and end plates on its left and right opposite sides. The base plate seals seal the side plates, the end plates and the base plate (1-1). The end plate is provided with end plate sealing elements on the front and rear sides, and the end plate sealing elements seal the front and rear sides of the end plate and the side plate. The base plate (1-1) has several front main grooves (1-5) on its front side. The bottom of the battery cell (3) is positioned in the front main grooves (1-5), and the gap between adjacent battery cells (3) is filled with filler glue.

2. The large battery cell module as described in claim 1, characterized in that, 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); Fluid channels are formed inside the extended plate of the liquid cooling plate (4); The gap between the battery cell (3) and the extended plate of the liquid cooling plate (4) is filled with the filler adhesive; After the liquid cooling pipe connector (4-2) of the liquid cooling plate (4) is connected to the liquid cooling pipe assembly (5), the liquid cooling pipe assembly (5) is connected to the fluid channel for the cooling fluid to enter and exit.

3. A large battery cell module as described in claim 2, characterized in that, The back of the base plate (1-1) is provided with a back main groove (1-9); the bottom of the back main groove (1-9) and the bottom of the front main groove (1-5) correspond vertically to each other and form a groove bottom thin wall (1-11). Pressure relief channels (1-8) are connected between two adjacent back main grooves (1-9), the left and right sides of the bottom plate (1-1), and the adjacent back main grooves (1-9).

4. A large-cell module as described in claim 3, characterized in that, The bottom of the main groove (1-9) on the back is also provided with a secondary groove (1-12).

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

6. A large-cell module as described in claim 2, characterized in that, Each of the end plates is provided with an end plate fastener (7-1) at its lower end. The bottom plate seal includes a second bottom plate foam strip (1-3); The left and right sides of the base plate (1-1) are provided with a first slot extending in the front-back direction, the first slot is provided with a second base plate foam strip (1-3), and the outside of the first slot is provided with a base plate fastener (1-6). The end plate is fixed to the base plate (1-1) by the snap-fit ​​connection of the corresponding end plate buckle (7-1) and the base plate buckle (1-6), and the lower end face of the end plate contacts the second base plate foam strip (1-3).

7. A large battery cell module as described in claim 6, characterized in that, The front side of the base plate (1-1) has several rows of front main grooves (1-5), and each row of front main grooves (1-5) is arranged along the left and right direction of the base plate (1-1). The liquid cooling assembly includes a plurality of liquid cooling plates (4), each liquid cooling plate (4) including an extension plate body and a liquid cooling pipe connector (4-2) at the right end, the liquid cooling pipe connector (4-2) and the liquid cooling pipe assembly (5) are connected to form a parallel structure of liquid cooling plates; The extension plate of the liquid cooling plate (4) extends along the left-right direction between two adjacent rows of the battery cells (3) placed in the main groove (1-5) on the front side. The right end plate (7) on the right side of the base plate (1-1) has an end plate U-shaped groove (7-2) that corresponds one-to-one with the liquid cooling plate (4), and the end plate U-shaped groove (7-2) is open at the lower end of the right end plate (7). The extended plate of the liquid cooling plate (4) is fitted with a liquid cooling plate seal (4-1) in the area near the liquid cooling pipe connector (4-2). The area on the liquid cooling plate (4) fitted with the liquid cooling plate seal (4-1) is inserted into the corresponding end plate U-shaped groove (7-2); A block-shaped groove is provided on the right side of the base plate (1-1) in the area corresponding to the bottom of the liquid cooling plate seal (4-1). The block-shaped groove is connected to the first slot. A base plate foam block (1-4) is provided in the block-shaped groove. The base plate foam block (1-4) is in contact with the corresponding liquid cooling plate seal (4-1).

8. A large battery cell module as described in claim 2, characterized in that, Each of the side plates has an L-shaped rib (2-2) extending in the left-right direction at the bottom of its inner surface. The bottom plate seal includes a first bottom plate foam strip (1-2) extending in the left and right directions on the front and rear sides of the bottom plate (1-1). The L-shaped rib (2-2) of the side plate at the bottom of the inner surface of the side plate hooks onto the bottom plate (1-1), and the first bottom plate foam strip (1-2) is sandwiched between the bottom plate (1-1) and the bottom of the inner surface of the side plate.

9. A large battery cell module as described in claim 8, characterized in that, Several side plate inner ribs (2-3) extending in the left and right directions are provided between the L-shaped ribs (2-2) at the top and bottom of the inner surface of the side plate. The inner reinforcing bars (2-3) of the side plate are T-shaped reinforcing bars.

10. A large battery cell module as described in claim 8, characterized in that, The L-shaped rib (2-2) at the top of the inner surface of the side plate has external guide grooves (2-5) at both the left and right ends. The inner ribs (2-3) on the inner surface of the side plate are provided with inner guide grooves (2-4) at both the 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 sides of the inner surface of the end plate are provided with end plate grooves (7-6). The end plate seal is an end plate sealing strip (7-5) with a hook. The outer guide groove (2-5) and the inner guide groove (2-4) of the side plate 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 rib (7-4).

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