Low-voltage battery box

Abstract

The utility model discloses a low-voltage battery box. Belongs to the technical field of lithium battery boxes. The low-voltage battery box mainly solves the problems that an existing low-voltage battery box is complex in structure, inconvenient to assemble, heavy in metal box body weight and high in production cost. The battery box is mainly characterized by comprising an upper cover, a lower box body and a battery module, the battery module comprises an end plate, a battery cell and a steel belt or a side plate; the upper cover is formed by injection molding and is provided with upper cover reinforcing ribs; the lower box body is formed by injection molding and is provided with lower box body reinforcing ribs; and the end plate is an injection-molded end plate. The vehicle low-voltage lithium ion battery has the characteristics of simple structure, convenience in assembly, light weight and low production cost, and is mainly used for low-cost vehicle low-voltage lithium ion batteries.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium battery boxes, and in particular relates to a low-voltage battery box comprising a lithium battery upper cover, a lower box assembly and a lithium battery module. Background Art

[0002] Commonly used battery box structures are mostly metal parts. The insulation performance of metal is not as good as that of plastic parts. In addition, the structure of the battery box requires some parts to pass current, especially some busbars. Considering the strength requirements of the busbars during actual use, they need to be fixed. The poor insulation of metal parts affects the complexity of the overall structure of the battery box; and the weight of the metal structure box is also relatively high, which affects the lightweight of the entire package.

[0003] At present, the more common module structures of aluminum shell lithium batteries on the market are mostly end plate and side plate structures, most of which are metal structures. The connection of the bus on the module requires other plastic parts for connection, which increases the structural complexity of the battery box and increases the cost of the whole package to a certain extent. Summary of the invention

[0004] The utility model aims to provide a low-voltage battery box which has a simple structure, is easy to assemble, light in weight and has a low production cost.

[0005] The technical solution of the utility model is: a low-voltage battery box, including an upper cover, a lower box body and a battery module, the battery module includes an end plate, a battery cell and a steel belt or a side plate, and is characterized in that: the upper cover is an injection-molded upper cover and is provided with an upper cover reinforcement rib; the lower box body is an injection-molded lower box body and is provided with a lower box body reinforcement rib; the end plate is an injection-molded end plate.

[0006] The technical solution of the utility model also includes a sealing ring; the upper end surface of the lower box body is provided with a mounting groove matched with the sealing ring.

[0007] The end plate described in the technical solution of the utility model is provided with a metal insert nut for installation, and an end plate positioning column is provided at the bottom.

[0008] The side of the end plate described in the technical solution of the utility model is reserved with connecting through holes of the same diameter; the bending angles on both sides of the end plate are chamfered and provided with slots that cooperate with the steel belt; the end plate is reserved with fixing holes for installing electrical parts, and metal nuts are embedded in the fixing holes.

[0009] The battery module described in the technical solution of the utility model is an integrated large module composed of two side end plates and battery cells arranged in a certain sequence therebetween, which are extruded by steel strips; a hoisting hole is provided above the end plates.

[0010] The battery cell tabs of the battery module described in the technical solution of the utility model are welded with a bus bar, a collection wire harness device is provided on the bus bar, and electrical parts are installed on metal nuts to form a simple system that can detect system circuits.

[0011] The bottom of the lower box body described in the technical solution of the utility model is provided with a baffle, a box bottom metal insert for fixing the module and a box bottom positioning hole for positioning the end plate; the baffle is arranged in the length direction of the lower box body.

[0012] The upper surface of the lower box body described in the technical solution of the utility model is evenly distributed with box top metal inserts for fixing the upper cover; the four corners of the upper surface of the lower box body are reserved with box top positioning holes for positioning with the upper cover; and handles are installed at both ends of the lower box body.

[0013] The upper cover described in the technical solution of the utility model is provided with an integrally-injected conical terminal and metal; the upper cover is provided with a communication connection metal insert at a position communicating with the outside world; and the upper cover is provided with a vertically-limited limiting reinforcing rib inside.

[0014] The bottom surface of the upper cover described in the technical solution of the utility model is evenly distributed with cover bottom metal inserts for fixing with the lower box body; and the upper cover is provided with a bead reinforcing rib for contacting with the bead.

[0015] The beneficial effects of the utility model are as follows: 1. Compared with the box body with metal structure, it has the overall advantage of lightweight; 2. The end plate of the module is embedded with metal nuts, which can be directly used to fix the relevant electrical parts of the overcurrent, etc., to avoid the transfer of other parts and reduce the structural complexity of the system; 3. The structure of the plastic end plate is diversified, which can meet the scheme of matching the steel belt with the end plate and the scheme of matching the end plate with the side plate; 4. Compared with two single modules, the integrated large module not only reduces the welding process cycle, but also reduces the assembly complexity of the module; 5. The bottom of the lower box is reserved with the bottom positioning hole of the module, and the plastic end plate is provided with the end plate positioning column to match the module fixing hole after the module is put into the box; 6. The module end plate can be used to fix the relevant electrical parts, forming a simple complete system, which can be used for electrical performance testing before entering the box; 7. The lip along the length direction of the interior of the lower box can not only strengthen the structure of the lower box, but also limit the displacement of the battery cell when the upper cover and the lower box are combined; 8. The raised pressure strip reinforcement ribs in the middle of the upper cover, It can not only enhance the strength of the box, but also limit the Z-axis direction of the module during the fixing process.

[0016] The utility model has the characteristics of simple structure, easy assembly, light weight and low production cost, and is mainly used for low-cost low-voltage lithium-ion batteries for vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of embodiment 1 of the utility model.

[0018] Figure 2 yes Figure 1 Schematic diagram of the structure of the mid-end board.

[0019] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle and lower box.

[0020] Figure 4 yes Figure 1 Schematic diagram of the structure of the middle upper cover.

[0021] Figure 5 It is a schematic diagram of the three-dimensional structure of Example 2 of the utility model.

[0022] Figure numbers: 1-upper cover; 2-lower box body; 3-sealing ring; 4-battery module; 5-card slot; 6-metal nut; 7-end plate positioning column; 8-connection through hole; 9-lifting hole; 10-baffle; 11-box bottom metal insert; 12-box bottom positioning hole; 13-conical terminal; 14-communication connection metal insert; 15-cover bottom metal insert; 16-limiting reinforcement rib; 17-pressure strip reinforcement rib. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, an embodiment 1 of a low-voltage battery box of the utility model is composed of an upper cover 1, a lower box body 2, a sealing ring 3 and a battery module 4. The battery module 4 includes an end plate, a battery cell and a steel belt.

[0025] like Figure 2As shown, the end plate is an injection molded end plate. The end plates on both sides of the battery module 4 are reserved with fixing holes for installing electrical parts. The metal nuts 6 are embedded in the fixing holes. The required electrical parts can be installed on the corresponding metal nuts 6 on the end plates as required. Two end plate positioning columns 7 are symmetrically arranged at the bottom of the end plate. The end plate positioning columns 7 are in the shape of conical protrusions and are used to position the fixing holes during the module entry process. The side of the end plate is reserved with connecting through holes 8 of the same diameter, which can be directly used for the fixed connection between the end plate and the side plate. One plate has multiple uses and strong versatility. The four corners of the end plate are provided with card slots 5, which are used to place the steel belt during the module assembly process and limit the steel belt. The bending angles on both sides of the end plate are chamfered, and upper and lower card slots that cooperate with the steel belt are provided, so that the steel belt can just smoothly fit into the upper and lower card slots of the end plate. A hoisting hole 9 is provided above the end plate. After the module is assembled, it can be hoisted into the box. There are different reinforcing ribs on the end plate for strengthening the end plate.

[0026] When assembling the battery module 4, first place the end plate on the front of the module cell, arrange the cells in a certain sequence, and after the arrangement is completed, squeeze the end plates at both ends through the tooling, and put the steel belt into the upper and lower slots of the end plates to form an integrated large module.

[0027] After the end plate and battery cell are assembled, laser welding is used to weld the busbar to the battery cell tabs. Since the one-piece module is equivalent to the splicing of two modules, the time for changing modules up and down is reduced during the welding process. The busbar on it is welded to the battery cell tabs through tooling.

[0028] The required electrical parts can be installed and fixed on the fixed holes reserved on the end plate through the corresponding metal nuts 6 as required. For the related parts for overcurrent, due to the insulation characteristics of the end plate, the necessity of designing separate insulation parts can be directly eliminated. After the installation of the related electrical parts on the module is completed, plus the collection wire harness device on the bus (not shown in the figure), a complete simple system with total positive and total negative can be formed, which is operable for the detection of the system circuit, and it is convenient to detect immediately after the error is found, without disassembling the complete battery pack.

[0029] like Figure 3As shown, the lower box body 2 is an injection molded lower box body. The bottom of the lower box body 2 is provided with a number of protrusions and bosses, wherein the protrusions are embedded with a box bottom metal insert 11 for fixing the module, and the bosses are provided with four box bottom positioning holes 12, which correspond to the end plate positioning columns 7 on the end plate, and are used for positioning when the end plate is installed. The bottom of the box body 2 is provided with a baffle 10, and the baffle 10 is arranged in the length direction of the lower box body 2. A square groove of a certain depth is reserved on the upper end surface of the lower box body 2, which is a mounting groove for matching with the sealing ring 3, so that the sealing ring 3 can be directly placed in the later assembly. The upper surface of the lower box body 2 is evenly distributed with box top metal inserts for fixing with the upper cover 1. The upper surface of the lower box body 2 is reserved with box top positioning holes at the four corners. When installing and fixing with the upper cover 1, the cover top positioning columns of the upper cover 1 can correspond to the box top positioning holes of the lower box body 2, ensuring that the remaining installation holes can correspond to the upper cover 1 one by one. Different reinforcing ribs are arranged around the inner wall of the inner side of the lower box body 2 to prevent deformation during the injection molding process and increase the strength of the box body. Handles are installed at both ends of the lower box body 2.

[0030] like Figure 4 As shown, the upper cover 1 is an injection molded upper cover. The upper cover 1 is provided with an integrally injection molded conical terminal 13 and metal. The conical terminal 13 is divided into two types: total positive and total negative. The fusion of the conical terminal and the upper cover has a sealing function requirement, and its function is to serve as the total positive and total negative of the outside world. The upper cover 1 is provided with a communication connection metal insert 14 at the position communicating with the outside world, which is used for fixing the communication with the outside world. The bottom surface of the upper cover 1 is evenly distributed with a cover bottom metal insert 15 for fixing with the lower box 2, which is to ensure that the plastic is not crushed during the installation process. The upper cover 1 is provided with a vertical limit reinforcing rib 16, which is located at the inner edge and is convex. While increasing the strength of the upper cover 1, the module can also be limited. The upper cover 1 is provided with a pressure strip reinforcing rib 17 for contacting the pressure strip, which is located in the middle of the inner side and is convex. It is to ensure contact with the pressure strip during the fixing process. When the outside world presses and fixes, it prevents the upper cover 1 from bearing pressure alone, and can also limit the Z-axis direction of the module.

[0031] After the battery module 4 is assembled and tested, it is hooked on the hoisting hole 9 above the end plate by hoisting. When entering the box, the baffle 10 is convenient for limiting the position of the module during entry. The end plate positioning column 7 cooperates with the positioning hole 10 at the bottom of the box to meet the long bolt fixation of the end plate and the lower box body 2. Before the long screw is fixed, install the two pressure strips and fix them together with the lower box body 2. After the module is installed in the box, after the positive and negative wiring harnesses are installed, put the sealing ring 3 into the sealing groove reserved on the upper surface of the lower box body 2 and install the sealing ring. After the upper cover 1 and the lower box body 2 are matched through the positioning column at the bottom of the cover and the positioning hole on the top of the box, ensure that the position of the remaining fixing holes is not offset and then they can be fixed. Finally, install the handles at both ends of the lower box body to facilitate the transportation of the battery box.

[0032] like Figure 5As shown, Example 2 of a low-voltage battery box of the utility model is the same as Example 1 except that the battery module adopts side plates instead of steel belts.

[0033] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A low-voltage battery box, comprising an upper cover (1), a lower box body (2) and a battery module (4), wherein the battery module (4) comprises an end plate, a battery cell and a steel strip or a side plate, wherein: The upper cover (1) is an injection-molded upper cover and is provided with an upper cover reinforcement rib; the lower box body (2) is an injection-molded lower box body and is provided with a lower box body reinforcement rib; the end plate is an injection-molded end plate; the side of the end plate is reserved with connection through holes (8) of the same diameter; the corners on both sides of the end plate are chamfered and provided with a slot for matching with a steel belt; the end plate is provided with a metal nut (6) for installation; the end plate is reserved with a fixing hole for installing electrical parts, and the metal nut (6) is embedded in the fixing hole.

2. A low-voltage battery box according to claim 1, characterized in that: It also includes a sealing ring (3); the upper end surface of the lower box body (2) is provided with a mounting groove that matches the sealing ring (3).

3. A low-voltage battery box according to claim 1 or 2, characterized in that: An end plate positioning column (7) is provided at the bottom of the end plate.

4. A low-voltage battery box according to claim 1 or 2, characterized in that: The battery module (4) is an integrated large module consisting of two side end plates and battery cells arranged in a certain sequence therebetween, extruded by steel strips; a hoisting hole is provided above the end plates.

5. A low-voltage battery box according to claim 4, characterized in that: A bus is welded on the cell tab of the battery module (4), a collection wire harness device is provided on the bus, and electrical parts are installed on the metal nut (6), forming a simple system capable of detecting system circuits.

6. A low-voltage battery box according to any one of claims 1-2 and 5, characterized in that: The bottom of the lower box body (2) is provided with a baffle (10), a box bottom metal insert (11) for fixing the module, and a box bottom positioning hole (12) for positioning the end plate; the baffle (10) is arranged in the length direction of the lower box body (2).

7. A low-voltage battery box according to claim 6, characterized in that: The upper surface of the lower box body (2) is evenly distributed with box top metal inserts for fixing with the upper cover (1); the four corners of the upper surface of the lower box body (2) are reserved with box top positioning holes for positioning with the upper cover (1); and handles are installed at both ends of the lower box body (2).

8. A low-voltage battery box according to any one of claims 1-2, 5 and 7, characterized in that: The upper cover (1) is provided with an integrally-injected conical terminal (13) and metal; the upper cover (1) is provided with a communication connection metal insert (14) at a position communicating with the outside world; and the upper cover (1) is provided with a vertically-limited limiting reinforcing rib (16).

9. A low-voltage battery box according to claim 8, characterized in that: The bottom surface of the upper cover (1) is evenly distributed with cover bottom metal inserts (15) for fixing with the lower box body (2); and the upper cover (1) is provided with a bead reinforcing rib (17) for contacting the bead.

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