Pole lug direct connection structure of soft package battery cell

Abstract

The utility model discloses a soft package battery cell tab direct connection structure which comprises a battery cell body, tab bodies are fixed on the battery cell body in a front-back symmetrical mode, the lower end face of the battery cell body makes contact with a bottom plate, threaded columns are vertically fixed on the upper end face of the bottom plate in a left-right symmetrical mode, pressing plates are connected to the threaded columns, and the pressing plates make contact with the upper end face of the battery cell body. An elastic band is also fixed on the pressing plate, a copper rod is arranged between the elastic band and the pressing plate, and the copper rod is arranged between two adjacent tab bodies. According to the soft package battery cell tab direct connection structure, the battery cell tabs are directly welded through tool supporting, plastic supports and aluminum row parts can be omitted, in other words, module battery cell tab direct connection has the advantages that production efficiency is high, the module structure is simplified, the module energy density is improved, the module part cost is reduced and the like, and by being matched with EPP plastic parts, the battery cell tab direct connection structure can be used for directly connecting the battery cells and the tabs. And the problems of collision and mutual contact of the welded tabs can be prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a soft-pack battery cell pole ear direct connection structure. Background Art

[0002] With the popularization of new energy vehicles, the installed capacity of power batteries is increasing. At present, the power battery pack is mainly composed of multiple module assemblies. The module battery cell tabs are welded through the support of plastic brackets and aluminum bars to realize the series and parallel connection of the battery cells. However, welding is achieved through plastic brackets and aluminum bar supports, which has defects such as the development cost of plastic parts and aluminum bar components, the cost of a large number of parts, complex production processes and low production efficiency. With the decline or even withdrawal of state subsidies for new energy vehicles, the profit margins of power batteries and car companies are further compressed, and the pressure to reduce costs is increasing. Due to the complex lap joint structure of traditional battery cell tabs and the high cost of component development, a structure with direct connection of module battery cell tabs is designed to achieve the purpose of reducing costs and maintaining product performance in response to the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a soft-pack battery cell tab direct connection structure to solve the problems of complex battery cell tab overlap structure and high cost proposed in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a soft-pack battery cell ear direct connection structure, including a battery cell body, the battery cell body is symmetrically fixed with an ear body front and back, the lower end face of the battery cell body is in contact with a bottom plate, the upper end face of the bottom plate is symmetrically and vertically fixed with threaded columns, the threaded columns are connected to a pressure plate, the pressure plate is in contact with the upper end face of the battery cell body, an elastic band is also fixed on the pressure plate, a copper rod is arranged between the elastic band and the pressure plate, and the copper rod is arranged between two adjacent ear bodies.

[0005] Preferably, a limit plate is fixed symmetrically on the upper surface of the bottom plate, and the limit plate is in contact with the battery cell body to achieve a limiting effect. In addition, concave holes are evenly opened on the bottom plate, and the concave holes and the copper rods are nested and connected. Mounting plates are also symmetrically arranged on the front and back sides of the battery cell body, which are nested with the copper rods through the concave holes, so that the copper rods can be easily positioned and installed, thereby providing support for the subsequent welding of the pole ear body.

[0006] Preferably, the threaded column and the pressure plate are slidably connected, and a fastening nut is threadedly connected to the threaded column. The position of the pressure plate can be adjusted through the sliding action between the threaded column and the pressure plate. With the action of the threaded column, it is convenient to lock the battery cell bodies of different heights, providing basic guarantee for the subsequent welding of the pole ear body.

[0007] Preferably, the pressure plate is also provided with grooves at equal intervals, and the grooves and the concave holes are distributed in a one-to-one correspondence, and the grooves and the copper rod are snap-fitted to each other, and the positioning of the copper rod can be achieved through the snap-fitting effect between the grooves and the copper rod.

[0008] Preferably, an anti-slip belt is fixed on one side of the elastic belt close to the pressure plate, and the anti-slip belt contacts the copper rod to achieve a limiting effect. Through the effects of the elastic belt and the anti-slip belt, the copper rod can be fixed to ensure the stability of the copper rod after installation.

[0009] Preferably, baffles are fixed at equal intervals on the lower end surface of the mounting plate, and the baffles are nested and connected to the pole lug body, and fastening strips are fixed to the outside of the baffles, and the fastening strips are in contact with the pole lug body. The mounting plate, baffles and fastening strips are all made of EPP plastic parts. The baffles can prevent the pole lugs from colliding and contacting each other after welding, thereby ensuring the stability of product performance. Combined with the supporting effect of the fastening strips, the stability of the connection between the baffles and the pole lug body can be ensured.

[0010] Compared with the prior art, the beneficial effects of the utility model are: the direct connection structure of the soft-pack battery cell pole ears, the battery cell pole ears are supported by tooling to achieve direct welding of the pole ears, and the plastic bracket and aluminum bar components can be eliminated. That is, the direct connection of the module battery cell pole ears has the advantages of high production efficiency, simplified module structure, improved module energy density, and reduced module component costs. Combined with the EPP plastic parts, it can prevent the pole ears from colliding and contacting each other after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the three-dimensional structure of the battery body and the bottom plate of the utility model;

[0012] Figure 2 This is a schematic diagram of a three-dimensional structure composed of a bottom plate and a threaded column of the utility model;

[0013] Figure 3 This is a schematic diagram of the three-dimensional structure of the battery body and the mounting plate of the utility model;

[0014] Figure 4 It is a schematic diagram of the three-dimensional structure of the mounting plate of the utility model.

[0015] In the figure: 1. battery cell body; 2. tab body; 3. bottom plate; 301. limit plate; 302. recessed hole; 4. threaded column; 401. fastening nut; 5. pressure plate; 501. groove; 6. elastic band; 601. anti-slip band; 7. copper rod; 8. mounting plate; 801. baffle bar; 802. fastening bar. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in 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.

[0017] See also Figure 1-Figure 4 The utility model provides a technical solution: a soft-pack battery cell ear direct connection structure, including a battery cell body 1, a pole ear body 2 is fixed symmetrically front and back to the battery cell body 1, the lower end surface of the battery cell body 1 is in contact with a bottom plate 3, and a threaded column 4 is vertically fixed symmetrically on the upper end surface of the bottom plate 3, a pressing plate 5 is connected to the threaded column 4, the pressing plate 5 is in contact with the upper end surface of the battery cell body 1, an elastic band 6 is also fixed on the pressing plate 5, a copper rod 7 is arranged between the elastic band 6 and the pressing plate 5, and the copper rod 7 is arranged between two adjacent pole ear bodies 2.

[0018] The upper end surface of the bottom plate 3 is symmetrically fixed with a limit plate 301, and the limit plate 301 contacts the battery body 1 to achieve a limiting effect, and the bottom plate 3 is evenly provided with concave holes 302, and the concave holes 302 are nested with the copper rod 7, and the mounting plates 8 are symmetrically arranged on the front and rear sides of the battery body 1; the threaded column 4 is slidably connected with the pressure plate 5, and the threaded column 4 is threadedly connected with a fastening nut 401; the pressure plate 5 is also evenly provided with grooves 501, and the grooves 501 are distributed one-to-one with the concave holes 302, and the grooves 501 are snap-fitted with the copper rod 7; an anti-slip belt 601 is fixed on the side of the elastic band 6 close to the pressure plate 5, and the anti-slip belt 601 contacts the copper rod 7 to achieve a limiting effect;

[0019] When using the soft-pack battery cell tab direct connection structure, Figure 1-Figure 3 As shown, firstly, the two bottom plates 3 are arranged according to the length of the battery cell body 1, and the front and rear ends of the lower end faces of the multiple battery cell bodies 1 are contacted with the bottom plates 3 on the front and rear sides. With the action of the limiting plate 301, the left and right limiting action of the multiple battery cell bodies 1 can be realized, and then with the sliding action between the pressing plate 5 and the threaded column 4, the pressing plate 5 can be installed until the pressing plate 5 contacts the upper end face of the battery cell body 1. At this time, it can be locked by tightening the nut 401, and then the distance between the elastic band 6 and the pressing plate 5 is adjusted by pulling the elastic band 6. With the nesting action between the groove 501 and the copper rod 7 and the copper rod 7 and the concave hole 302, the copper rod 7 can be installed, and at this time, the copper rod 7 is located between the two adjacent pole ear bodies 2. Finally, the elastic band 6 is loosened, and the anti-slip band 601 can be made to be in close contact with the copper rod 7 through the elastic force of the elastic band 6 itself, thereby realizing the positioning of the copper rod 7 and the stability of the installation of the copper rod 7.

[0020] The lower end surface of the mounting plate 8 is also fixed with a baffle 801 at equal intervals, and the baffle 801 is nested with the tab body 2, and a fastening strip 802 is fixed to the outside of the baffle 801, and the fastening strip 802 is in contact with the tab body 2. The mounting plate 8, the baffle 801 and the fastening strip 802 are all made of EPP plastic parts;

[0021] After the copper rod 7 is installed, Figure 1 and Figure 4 As shown, the bending of the pole lug body 2 can be achieved by using the copper rod 7 as a support, which facilitates the welding of two adjacent pole lug bodies 2 and realizes the direct connection of the pole lug body 2, thereby eliminating the need for the support of the aluminum row. According to the above principle, after the welding of the pole lug body 2 is completed, the bottom plate 3, the pressure plate 5 and the copper rod 7 are disassembled, and then the baffle 801 is inserted into the gap between the adjacent pole lug bodies 2. The fastening bar 802 can ensure the stability of the connection between the baffle 801 and the pole lug body 2. Through the action of the baffle 801, the pole lug bodies 2 can be prevented from contacting each other, thereby realizing the production and manufacturing of the pole lug body 2 direct-connected module products. This is the working principle of the soft-pack battery cell pole lug direct connection structure.

[0022] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A soft-pack battery cell tab direct connection structure, comprising a battery cell body (1), wherein a tab body (2) is symmetrically fixed to the battery cell body (1) in the front and rear directions, characterized in that: The lower end surface of the battery cell body (1) contacts the bottom plate (3); a threaded column (4) is vertically fixed to the upper end surface of the bottom plate (3) in a left-right symmetrical manner; a pressing plate (5) is connected to the threaded column (4); the pressing plate (5) contacts the upper end surface of the battery cell body (1); an elastic band (6) is also fixed to the pressing plate (5); a copper rod (7) is arranged between the elastic band (6) and the pressing plate (5); and the copper rod (7) is arranged between two adjacent tab bodies (2).

2. The soft-pack battery cell tab direct connection structure according to claim 1, characterized in that: The upper end surface of the bottom plate (3) is symmetrically fixed with a limit plate (301), and the limit plate (301) is in contact with the battery cell body (1) to achieve a limit function. The bottom plate (3) is also evenly provided with concave holes (302), and the concave holes (302) and the copper rod (7) are nested and connected. The battery cell body (1) is also symmetrically provided with mounting plates (8) on both sides.

3. The soft-pack battery cell tab direct connection structure according to claim 1, characterized in that: The threaded column (4) and the pressing plate (5) are slidably connected, and a fastening nut (401) is threadedly connected to the threaded column (4).

4. The soft-pack battery cell tab direct connection structure according to claim 1, characterized in that: The pressing plate (5) is also provided with grooves (501) at equal intervals, and the grooves (501) and the concave holes (302) are distributed in a one-to-one correspondence, and the grooves (501) and the copper rod (7) are in a snap-fit ​​connection.

5. The soft-pack battery cell tab direct connection structure according to claim 1, characterized in that: An anti-slip belt (601) is fixed to one side of the elastic belt (6) close to the pressure plate (5), and the anti-slip belt (601) contacts the copper rod (7) to achieve a limiting effect.

6. The soft-pack battery cell tab direct connection structure according to claim 2, characterized in that: The lower end surface of the mounting plate (8) is also fixed with retaining strips (801) at equal intervals, and the retaining strips (801) and the tab body (2) are nested and connected, and a fastening strip (802) is also fixed to the outside of the retaining strip (801), and the fastening strip (802) is in contact with the tab body (2), and the mounting plate (8), retaining strip (801) and fastening strip (802) are all made of EPP plastic.

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