A modular structure for square lithium batteries

Abstract

This invention discloses a prismatic lithium battery assembly structure, comprising a main support frame with a rectangular, open box and a plurality of prismatic battery cells evenly arranged therein; the top of each prismatic battery cell is connected to a PCB protection board; the top of the main support frame is fixed by a top cover support frame. This invention utilizes the mutual interference and cooperation of a first and second isolation support frame to correct the surface misalignment of the main support frame with the surface of the battery cells, ensuring a face-to-face fit. The isolation board uses a slider to ensure a smooth fit with the prismatic battery cell surface without draft angle. The second isolation support frame features a wire-aligning area with limiting guide ribs, ensuring wire isolation safety and providing reliable support and fixation for the PCB protection board. The planar fit between the support frame and the battery cells improves the overall structural integrity; the multifunctionality of the second isolation support frame effectively improves structural consistency and reliability; and the effective snap-fit ​​between the main support frame and the top cover support frame enhances the safety of the battery cells.

Description

Technical Field

[0001] This invention relates to the field of lithium battery technology, and in particular to a pack structure for square lithium batteries. Background Technology

[0002] With societal progress and development, the increasing intelligence of warehousing, homes, and travel, and the diversification of portable consumer electronics, batteries, as providers of clean energy, are becoming increasingly popular and favored by consumers, becoming an indispensable part of electronic products. In application, the reliability of battery packs helps improve battery lifespan, enhances the overall reliability of the battery's surrounding environment, provides users with greater peace of mind, and increases user acceptance, making this a very meaningful research topic.

[0003] Existing square battery packs use a loose, simple stacking structure. They are placed together and have an injection-molded casing. The injection molding process creates a draft angle, which prevents a tight fit with the battery cells, resulting in severe looseness. During vibration or drops, this greatly increases the risk of electrical connection failure in the battery pack and significantly increases the possibility of structural damage. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a square lithium battery pack structure that is reliable, highly consistent, and has a high safety factor.

[0005] This invention is achieved in the following manner:

[0006] A prismatic lithium battery assembly structure includes a main support frame with a rectangular open box and a plurality of square battery cells evenly arranged therein; a PCB protection board is connected to the top of each square battery cell; the top of the main support frame is fixed by a top cover support frame, characterized in that: a gap is formed between the opposite faces of any two square battery cells to form a plurality of intersecting horizontal and vertical grooves within the main support frame; a first isolation bracket is provided in the vertical groove; a first clearance groove is provided above the first isolation plate of the first isolation bracket, which is opposite to the horizontal groove and equal in number; the first isolation bracket cooperates with a second isolation bracket: the bottom of the second isolation bracket is provided with a second isolation plate equal in number to the horizontal grooves and disposed therein; the bottom of the second isolation plate is provided with a second clearance groove equal in number to the vertical grooves and engaging with the first clearance grooves; both sides of the first isolation plate and the second isolation plate are provided with locking pieces that engage with the side walls of the main support frame.

[0007] Furthermore, the side wall of the main support is provided with an isolation groove that cooperates with the locking piece; the bottom of the isolation groove is provided with a limiting block; the top of the locking piece is integrally formed with the first isolation plate or the second isolation plate and a clearance groove is formed below the connection; the bottom of the locking piece is provided with a locking slot that engages with the limiting block.

[0008] Furthermore, the width of the first clearance groove is greater than the width of the transverse groove.

[0009] Furthermore, the width of the second clearance groove is greater than the width of the longitudinal groove.

[0010] Furthermore, the top of the second isolation bracket is provided with several limiting guide ribs, and a wire limiting groove is formed between two oppositely arranged limiting guide ribs; a connecting wire is snapped into the wire limiting groove.

[0011] Furthermore, a PCB protection board is connected to the top of the second isolation bracket; the limiting guide rib passes through the through hole set at the corresponding position on the PCB protection board and contacts the bottom of the upper cover bracket.

[0012] Furthermore, a PCB protection board is connected to the top of the second isolation bracket; the PCB protection board is connected to the screw fixing post at the top of the second isolation bracket by screws; and electrode plates are welded between the PCB protection board and the square battery cell.

[0013] Furthermore, the upper cover bracket has several fixing pieces on its side; the bottom of the fixing pieces has fixing piece slots; the fixing piece slots engage with the limiting buckles provided on the outer side of the main body bracket.

[0014] Furthermore, the mating surfaces of the first and second isolation plates with the battery cell are both non-draft surfaces.

[0015] Furthermore, the sum of the depths of the first clearance groove and the second clearance groove is greater than the length of the square battery cell.

[0016] The beneficial effects of this invention are as follows: The mutual interference and coordination of the first and second isolation brackets on the slope of the main support corrects the face-to-face fit between the inner surface of the main support and the surface of the battery cell. The isolation plate uses a slider to ensure a square battery cell surface without draft angle. The second isolation bracket features a wire-aligning area with limiting guide ribs, ensuring wire isolation safety and providing reliable support and fixation for the PBC protection board. The planar fit between the bracket and the battery cell improves the overall structural integrity. The multifunctionality of the second isolation bracket effectively improves structural consistency and reliability. The effective snap-fit ​​between the main support and the top cover bracket enhances battery cell safety. The overall proportion of metal components is very small, significantly improving safety from a safety perspective. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 Exploded view of the square battery pack structure of this invention;

[0019] Figure 2 Schematic diagram of the main support structure of this invention;

[0020] Figure 3 Schematic diagram of the square battery cell structure of this invention;

[0021] Figure 4 Schematic diagram of the first isolation bracket structure of the present invention;

[0022] Figure 5 Schematic diagram of the second isolation bracket structure of the present invention;

[0023] Figure 6 Schematic diagram of interference guidance for the second isolation bracket of the present invention; Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example:

[0028] like Figure 1-5 As shown, a square lithium battery assembly structure includes a main support 1 with a rectangular open box and a plurality of square battery cells 2 evenly arranged therein; the top of the square battery cells 2 is connected to a PCB protection board 7; the top of the main support 1 is fixed by a top cover support 9, characterized in that: there is a gap between the opposite faces of any two square battery cells 2 to form a plurality of horizontal and vertical grooves 21 and vertical grooves 22 in the main support 1; a first isolation support 3 is provided in the vertical groove 22; a first clearance groove 32 is provided above the first isolation plate 31 of the first isolation support 3, which is opposite to the horizontal groove 21 and equal in number; the first isolation support 3 cooperates with a second isolation support 5: the bottom of the second isolation support 5 is provided with a second isolation plate 51 equal in number to the horizontal grooves 21 and disposed therein; the bottom of the second isolation plate 51 is provided with a second clearance groove 52 equal in number to the vertical grooves 22 and engaged with the first clearance groove 32; both sides of the first isolation plate 31 and the second isolation plate 51 are provided with locking pieces 4 that engage with the side wall of the main support 1.

[0029] In one embodiment of the present invention, the side wall of the main support 1 is provided with an isolation groove 11 that cooperates with the locking piece 4; the bottom of the isolation groove 11 is provided with a limiting block 13; the top of the locking piece 4 is integrally formed with the first isolation plate 31 or the second isolation plate 51 and a clearance groove 41 is formed below the connection; the bottom of the locking piece 4 is provided with a locking slot 42 that engages with the limiting block 13.

[0030] In one embodiment of the present invention, the width of the first clearance groove 32 is greater than the width of the transverse groove 21.

[0031] In one embodiment of the present invention, the width of the second clearance groove 52 is greater than the width of the longitudinal groove 22.

[0032] In one embodiment of the present invention, the top of the second isolation bracket 5 is provided with a plurality of limiting guide ribs 53, and a wire limiting groove 54 is formed between two oppositely arranged limiting guide ribs 53; a connecting wire is snapped into the wire limiting groove 54.

[0033] In one embodiment of the present invention, a PCB protection board 7 is connected to the top of the second isolation bracket 5; the limiting guide rib 53 passes through the through hole provided at the corresponding position on the PCB protection board 7 and contacts the bottom of the upper cover bracket 9.

[0034] In one embodiment of the present invention, a PCB protection board 7 is connected to the top of the second isolation bracket 5; the PCB protection board 7 is connected to the screw fixing post 55 at the top of the second isolation bracket 5 by screws 8; and an electrode 6 is welded between the PCB protection board 7 and the square battery cell 2.

[0035] In one embodiment of the present invention, the side of the upper cover bracket 9 is provided with a plurality of fixing pieces 91; the bottom of the fixing piece 91 is provided with a fixing piece slot 93; the fixing piece slot 93 engages with a limiting buckle 12 provided on the outside of the main body bracket 1.

[0036] In one embodiment of the present invention, the mating surfaces of the first isolation plate 31 and the second isolation plate 51 with the battery cell 2 are both non-draft surfaces.

[0037] In one embodiment of the present invention, the sum of the depths of the first clearance groove 32 and the second clearance groove 52 is greater than the length of the square battery cell 2.

[0038] In one embodiment of the present invention, the first isolation bracket 3 and the second isolation bracket 5 respectively interfere with the main bracket 1 to correct the inner surface of the main bracket 1 and the surface of the square cell 2 to form a face-to-face fit;

[0039] like Figure 6 As shown, the outer draft angle of the second isolation bracket 5 is equal to the inner draft angle of the main bracket 1. When the square battery cell 2 is placed inside the main bracket 1, the interference area of ​​the bracket draft formed by the second isolation plate 51 and the side of the square battery cell 2 is exactly canceled out by the gap area of ​​the outer shell draft formed by the square battery cell 2 and the inner side of the main bracket 1. With the cooperation of the locking piece 4 set on the outer side of the second isolation plate 51, a stable connection is formed. Similarly, the outer draft angle of the first isolation bracket 3 is equal to the inner draft angle of the main bracket 1, thus forming a stable connection.

[0040] The first isolation bracket 3 and the second isolation bracket 5 are both manufactured by injection molding, and both have a non-draft surface that mates with the battery cell plane. The injection molding uses a slider to realize the non-draft surface, and the size of the non-draft surface is determined according to the size of the battery cell, without limiting the required size.

[0041] The integrated design of the second isolation bracket 5 includes the wire limiting groove 54, the size of the limiting guide rib 53 of which is determined according to the diameter of the wire; the height of the wire limiting groove 54 is determined according to the height of the PCB protection board 7 and the height of the wire; the length of the wire limiting groove 54 is adjusted according to the spacing of the selected battery cells; the material of the wire limiting groove 54 is not limited and can be ABS, PC, or other materials.

[0042] The first isolation bracket 3 and the second isolation bracket 5 are reliably fixed to the main bracket 1 through the cooperation of the fixing plate slot 93 and the limit buckle 12, with a quantity of 6 limit buckles;

[0043] The first isolation bracket 3 and the second isolation bracket 5 are interspersed between the battery cells through the first clearance groove 32 and the second clearance groove 52; the opening width of the first clearance groove 32 and the second clearance groove 52 must be at least greater than the gap between the battery cells, and the height of the grooves must not cause interference between the first clearance groove 32 and the second clearance groove 52, but they can cooperate with each other.

[0044] The limiting guide rib 53 of the second isolation bracket 5 also supports the pressure transmission between the battery cell and the top cover bracket, ensuring the effective end face fixation of the battery cell; the wire guide rib of the second isolation bracket 5 supports the pressure-bearing surface of the battery cell and the top cover bracket, and its size or shape can be adjusted in the length and thickness directions. It can be a hollow rectangle instead of a regular rectangle, increasing the force-bearing area.

[0045] Electrode 6 includes a total positive electrode and a total negative electrode; the connection between the total positive electrode and the total negative electrode is made by L-shaped welding with PCB protection board 7; the structure of electrode 6 is L-shaped, the size of the L-shape is designed according to the current output or input requirements, the thickness is adjusted according to the welding process, the material can be copper, aluminum, etc., and the welding process can be gas shielded welding, friction welding, etc.

[0046] The second isolation bracket 5 provides a reliable fixing position for the PCB protection board 7 using screws 8, with a total of 4 screws; the screws 8 of the PCB protection board 7 are of ST2.9 specification, and the number of fixing positions is determined according to the area of ​​the PCB protection board 7, with an average of 4 screws arranged per 10000mm2 area.

[0047] The upper cover bracket 9 and the main body bracket 1 are connected by snap-fit, a total of 8, which are achieved by the snap-fit ​​of the fixing plate slot 93 and the limiting buckle 12; the main positive line and the main negative line are led out from the PCB board to the through hole 92 of the upper cover bracket 9 through the upper cover bracket 9, and exposed on the outside through the upper cover bracket 9. The size of the through hole of the wire is determined according to the wire selected according to the current load.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A prismatic lithium battery assembly structure, comprising a main support (1) of a rectangular open-top box and a plurality of prismatic cells (2) uniformly arranged therein; a PCB protection board (7) is connected to the top of the prismatic cells (2); the top of the main support (1) is fixed by a top cover support (9), characterized in that: A gap exists between the opposing surfaces of any two square cells (2) to form several intersecting horizontal and vertical slots (21) and vertical slots (22) within the main support (1); a first isolation bracket (3) is provided within the vertical slot (22); a first clearance slot (32) is provided above the first isolation plate (31) of the first isolation bracket (3) and is equal in number to the horizontal slot (21); the first isolation bracket (3) cooperates with the second isolation bracket (5): the bottom of the second isolation bracket (5) is provided with a second isolation plate (51) equal in number to the horizontal slot (21) and located within the horizontal slot (21); the bottom of the second isolation plate (51) is provided with a second clearance slot (52) equal in number to the vertical slot (22) and engaged with the first clearance slot (32); both sides of the first isolation plate (31) and the second isolation plate (51) are provided with locking pieces (4) that engage with the side wall of the main support (1); The first isolation bracket (3) and the second isolation bracket (5) respectively interfere with the main bracket (1) to correct the inner surface of the main bracket (1) and the surface of the square battery cell (2) to form a face-to-face fit; the outer draft angle of the second isolation bracket (5) is equal to the inner draft angle of the main bracket (1); the outer draft angle of the first isolation bracket (3) is equal to the inner draft angle of the main bracket (1); the top of the second isolation bracket (5) is provided with several limiting guide ribs (53), and the limiting guide ribs (53) pass through the through holes set at corresponding positions on the PCB protection board (7) and contact the bottom of the upper cover bracket (9); the limiting guide ribs (53) of the second isolation bracket (5) support the pressure transmission between the battery cell and the upper cover bracket (9) to ensure the effective end face fixation of the battery cell; the main bracket (1) has an isolation groove (11) on its side wall that cooperates with the locking piece (4); the bottom of the isolation groove (11) has a limiting block (13); the top of the locking piece (4) is integrally formed with the first isolation plate (31) or the second isolation plate (51) and a clearance groove (41) is formed below the connection; the bottom of the locking piece (4) has a slot (42) that engages with the limiting block (13); the side of the upper cover bracket (9) has several fixing pieces (91); the bottom of the fixing piece (91) has a fixing piece slot (93); the fixing piece slot (93) engages with the limiting buckle (12) set on the outside of the main body bracket (1); the mating surfaces of the first isolation plate (31) and the second isolation plate (51) with the square battery cell (2) are all non-draft surfaces.

2. The assembly structure of a square lithium battery according to claim 1, characterized in that: The width of the first clearance groove (32) is greater than the width of the transverse groove (21).

3. The assembly structure of a square lithium battery according to claim 1, characterized in that: The width of the second clearance groove (52) is greater than the width of the longitudinal groove (22).

4. The assembly structure of a square lithium battery according to claim 1, characterized in that: A wire limiting groove (54) is formed between two opposing limiting guide ribs (53); a connecting wire is snapped into the wire limiting groove (54).

5. The assembly structure of a square lithium battery according to claim 4, characterized in that: The top of the second isolation bracket (5) is connected to a PCB protection board (7).

6. The assembly structure of a square lithium battery according to claim 1, characterized in that: The top of the second isolation bracket (5) is connected to a PCB protection board (7); the PCB protection board (7) is connected to the screw fixing post (55) at the top of the second isolation bracket (5) by screws (8); the PCB protection board (7) and the square cell (2) are welded together with an electrode sheet (6).

7. The assembly structure of a square lithium battery according to claim 1, characterized in that: The sum of the depths of the first clearance groove (32) and the second clearance groove (52) is greater than the length of the square cell (2).

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