A square battery based on a side tab design

Abstract

The utility model discloses a square battery based on side surface connecting piece design. Including cover plate base body, shell and L type connecting piece, cover plate base body both ends are provided with electrode assembly, and electrode assembly includes pressboard, insulating plate and rivet, and the rivet is in proper order from below to above and is fixedly connected with pressboard and is penetrated through cover plate base body, insulating plate and pressboard, L type connecting piece includes horizontal plate and vertical board, and horizontal plate is parallel to cover plate base body and is connected with the lower part of rivet, and vertical board is along the direction of perpendicular and is away from cover plate base body extension, be provided with roll core in the shell, and roll core adopts full tab winding, and forms tab on both sides of roll core and is fixedly connected with the vertical board of L type connecting piece. Through setting up L type connecting piece, save the inside space of shell, and full tab winding forms tab on both sides of roll core and is connected with the vertical board of L type connecting piece, increase the connecting area of vertical board of L type connecting piece and then improve current density and rate performance.

Description

TECHNICAL FIELD

[0001] The utility model belongs to battery technical field especially relates to a square battery based on side surface connecting piece design. BACKGROUND

[0002] With the development of new energy technology, lithium batteries and sodium batteries as a kind of high energy density, long cycle life energy storage devices, have been widely used in electric vehicles, portable electronic devices and energy storage systems.Lithium batteries and sodium batteries are usually composed of a shell, a roll core and a cover plate, wherein the roll core is composed of a positive plate, a negative plate and a separator, and is wound or laminated, which is the core component of the battery to realize electrochemical reaction.

[0003] In the prior art, the shell and the cover plate of the lithium battery are usually designed with a compact structure to realize the miniaturization and high energy density of the battery.However, this compact structure also brings some problems.Due to the unreasonable design of the cover plate structure, the internal space of the shell is limited, and the volume and effective reaction area of the roll core cannot be further improved, thereby limiting the current density and overall performance of the battery.

[0004] In addition, the existing cover plate design often does not fully consider the spatial layout between the roll core and the cover plate, which leads to the roll core being easily squeezed or deformed during assembly, affecting the safety and cycle life of the battery.Therefore, how to ensure the necessary structure of the battery while optimizing the cover plate design to provide more accommodation space for the roll core has become a technical problem to be solved in the current lithium battery or sodium battery structure design.

[0005] Therefore, it is urgent to develop a more effective technical solution to overcome the defects of the existing battery shell to promote the further development and application expansion of battery technology. UTILITY MODEL CONTENTS

[0006] In view of the above analysis, the utility model aims to provide a battery cover plate and square battery based on side surface connecting piece design, which solves at least one of the following technical problems: (1) the unreasonable design of the cover plate structure in the prior art leads to the limited internal space of the battery shell, and the volume and effective reaction area of the roll core cannot be further improved, thereby limiting the current density and overall performance of the battery; (2) in order to increase the current density, the spatial layout between the roll core and the cover plate is not fully considered in the design of the cover plate in the prior art, which leads to the roll core being easily squeezed or deformed during assembly, affecting the safety and cycle life of the battery.

[0007] The purpose of the utility model is mainly realized through the following technical solutions: This utility model provides a square battery based on a side connecting piece design, including a cover plate base 1, a shell 2 and an L-shaped connecting piece. The cover plate base 1 is provided with electrode assemblies at both ends. The electrode assembly includes a pressure plate, an insulating plate and a rivet. The rivet passes through the cover plate base 1, the insulating plate and the pressure plate from bottom to top and is fixedly connected to the pressure plate. The L-shaped connecting piece includes an integrally formed horizontal plate and a vertical plate. The horizontal plate is parallel to the cover plate base 1 and is fixedly connected to the lower part of the rivet. The vertical plate extends along a direction perpendicular to and away from the cover plate base 1. The housing 2 is provided with a core 7, which is wound with full tabs. Tabs 10 are formed on both sides of the core 7 and are fixedly connected to the vertical plate of the L-shaped connecting piece.

[0008] Furthermore, the horizontal plate of the L-shaped connecting piece is fixedly connected to the rivet by welding.

[0009] Furthermore, the electrode assembly includes a positive electrode assembly and a negative electrode assembly.

[0010] Furthermore, the positive electrode assembly includes a positive electrode pressure plate 4-1, a positive electrode insulating plate 5-1, and a positive electrode rivet 6-1. The positive electrode rivet 6-1 passes through the cover plate base 1, the positive electrode insulating plate 5-1, and the positive electrode pressure plate 4-1 from bottom to top, and is fixedly connected to the positive electrode pressure plate 4-1.

[0011] Furthermore, the negative electrode assembly includes a negative electrode pressure plate 4-2, a negative electrode insulating plate 5-2, and a negative electrode rivet 6-2. The negative electrode rivet 6-2 passes through the cover plate base 1, the negative electrode insulating plate 5-2, and the negative electrode pressure plate 4-2 from bottom to top, and is fixedly connected to the negative electrode pressure plate 4-2.

[0012] Furthermore, the L-shaped connecting piece includes a positive L-shaped connecting piece 3-1 and a negative L-shaped connecting piece 3-2. The horizontal plate in the positive L-shaped connecting piece 3-1 is fixedly connected to the lower part of the positive rivet 6-1; the horizontal plate in the negative L-shaped connecting piece 3-2 is fixedly connected to the lower part of the negative rivet 6-2.

[0013] Furthermore, the electrode tab 10 includes a positive electrode tab 10-1 and a negative electrode tab 10-2. The vertical plate in the positive L-shaped connecting piece 3-1 is fixedly connected to the positive electrode tab 10-1; the vertical plate in the negative L-shaped connecting piece 3-2 is fixedly connected to the lower part of the negative electrode tab 10-2.

[0014] Furthermore, the cover plate substrate 1 is provided with an explosion-proof valve 8, and the explosion-proof valve 8 is provided with an explosion-proof valve patch 9.

[0015] Furthermore, the cover plate base 1 is provided with a liquid injection hole, which is sealed by a sealing pin.

[0016] Furthermore, the housing 2 has an upward-opening cavity, and the opening of the housing 2 is sealed to the cover plate base 1.

[0017] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: (1) In this utility model, by optimizing the connecting piece to be an L-shaped connecting piece, the L-shaped connecting piece is fixedly connected to the tab on the side of the core. At the same time, the core can be fixed by using full tab winding, without the need to set a stop frame, thereby saving the internal space of the housing, reserving more space for the battery cell, and thus increasing the current density.

[0018] (2) In this utility model, the winding core forms tabs on both sides and is fixedly connected to the vertical plate of the L-shaped connecting piece. Since the winding core is wound with full tabs, the connection area with the vertical plate of the L-shaped connecting piece can be increased, thereby increasing the current flow area and improving the rate performance of the battery.

[0019] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0020] The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0021] Figure 1 An exploded view of the square battery provided by this utility model; Figure 2 A schematic diagram of the appearance of the square battery provided by this utility model; Figure 3 A cross-sectional view of the square battery provided by this utility model.

[0022] Figure label: 1. Cover plate base; 2. Shell; 3-1. Positive L-shaped connecting piece; 3-2. Negative L-shaped connecting piece; 4-1. Positive pressure plate; 4-2. Negative pressure plate; 5-1. Positive insulation plate; 5-2. Negative insulation plate; 6-1. Positive rivet; 6-2. Negative rivet; 7. Core; 8. Explosion-proof valve; 9. Explosion-proof valve patch; 10-1. Positive electrode tab; 10-2. Negative electrode tab. Detailed Implementation

[0023] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0024] This utility model provides a square battery based on a side connecting piece design, including a cover plate base 1, a shell 2 and an L-shaped connecting piece. The cover plate base 1 has electrode assemblies at both ends. The electrode assemblies include a pressure plate, an insulating plate and rivets. The rivets pass through the cover plate base 1, the insulating plate and the pressure plate from bottom to top and are fixedly connected to the pressure plate. The L-shaped connecting piece includes an integrally formed horizontal plate and a vertical plate. The horizontal plate is parallel to the cover plate base 1 and is fixedly connected to the lower part of the rivet. The vertical plate extends along a direction perpendicular to and away from the cover plate base 1. The housing 2 is provided with a core 7, which is wound with full tabs. Tabs 10 are formed on both sides of the core 7 and are fixedly connected to the vertical plate of the L-shaped connecting piece.

[0025] In this invention, by optimizing the connecting piece into an L-shaped connecting piece, the L-shaped connecting piece is fixedly connected to the tab on the side of the core, thus eliminating the method of forming the tab from the top of the core. At the same time, by using full tab winding, the core can be fixed, so there is no need to set a stop frame, thereby saving internal space of the housing, reserving more space for the battery cell, and thus increasing the current density.

[0026] Furthermore, since the core is wound with all tabs and tabs 10 are formed from both sides of the core and fixedly connected to the L-shaped connecting piece, the connection area with the L-shaped connecting piece can be increased, thereby increasing the current flow area to improve the rate performance of the battery.

[0027] In some embodiments of this invention, the horizontal plate of the L-shaped connecting piece is fixedly connected to the rivet by welding. Welding improves the stability of the battery assembly and enhances safety while ensuring normal battery operation.

[0028] According to this utility model, the electrode assembly includes a positive electrode assembly and a negative electrode assembly, which are respectively fixed to both ends of the cover plate base 1.

[0029] In some embodiments of this utility model, the positive electrode assembly includes a positive electrode pressure plate 4-1, a positive electrode insulating plate 5-1, and a positive electrode rivet 6-1. The positive electrode pressure plate 4-1 and the positive electrode insulating plate 5-1 are located on the top surface of the cover plate base 1, and the positive electrode rivet 6-1 is located on the bottom surface of the cover plate base 1. The positive electrode rivet 6-1 passes through the cover plate base 1, the positive electrode insulating plate 5-1, and the positive electrode pressure plate 4-1 from bottom to top, and is fixedly connected to the positive electrode pressure plate 4-1.

[0030] In some embodiments of this utility model, the negative electrode assembly includes a negative electrode pressure plate 4-2, a negative electrode insulating plate 5-2, and a negative electrode rivet 6-2. The negative electrode pressure plate 4-2 and the negative electrode insulating plate 5-2 are located on the top surface of the cover plate base 1, and the negative electrode rivet 6-2 is located on the bottom surface of the cover plate base 1. The negative electrode rivet 6-2 passes through the cover plate base 1, the negative electrode insulating plate 5-2, and the negative electrode pressure plate 4-2 from bottom to top, and is fixedly connected to the negative electrode pressure plate 4-2.

[0031] In this utility model, through the above structural design, it can be seen that the battery can eliminate the space-consuming stop frame in the cover design, thereby reserving more space for the winding core to improve the current density of the battery. It is understood that the fixed connection can be achieved by welding.

[0032] In some embodiments of this utility model, the L-shaped connecting piece includes a positive L-shaped connecting piece 3-1 and a negative L-shaped connecting piece 3-2. The horizontal plate in the positive L-shaped connecting piece 3-1 is fixedly connected to the lower part of the positive rivet 6-1; the horizontal plate in the negative L-shaped connecting piece 3-2 is fixedly connected to the lower part of the negative rivet 6-2.

[0033] In this invention, the horizontal plate of the L-shaped connecting piece is connected to the lower part of the rivet. Due to the large contact area and low resistance, it is conducive to the conduction of large current, reducing energy loss and heat generation. It is understood that a fixed connection can be achieved by welding.

[0034] In some embodiments of this utility model, the electrode tab 10 includes a positive electrode tab 10-1 and a negative electrode tab 10-2. The vertical plate in the positive L-shaped connecting piece 3-1 is fixedly connected to the positive electrode tab 10-1, and the vertical plate in the negative L-shaped connecting piece 3-2 is fixedly connected to the lower part of the negative electrode tab 10-2.

[0035] In this utility model, the tab 10 includes a positive tab 10-1 and a negative tab 10-2. The vertical plate in the positive L-shaped connecting piece 3-1 is fixedly connected to the positive tab 10-1. The vertical plate in the negative L-shaped connecting piece 3-2 is fixedly connected to the lower part of the negative tab 10-2. At the same time, the use of full tab winding can increase the connection area with the L-shaped connecting piece, thereby increasing the current flow area to improve the rate performance of the battery. It can be understood that the fixed connection can be achieved by welding.

[0036] In some embodiments of this utility model, the cover plate substrate 1 is provided with an explosion-proof valve 8, and the explosion-proof valve 8 is provided with an explosion-proof valve patch 9.

[0037] In this invention, when the internal pressure of the battery exceeds a set threshold, the explosion-proof valve 8 will rupture or open to release gas in time, preventing the battery casing from rupturing or exploding. The explosion-proof valve patch 9 is used to cover the explosion-proof valve to prevent external dust, moisture, electrolyte vapor, etc., from entering or corroding the explosion-proof valve, thus maintaining the normal operation of the battery. It also provides a certain degree of buffering and isolation, preventing minor pressure fluctuations or external impacts from causing the explosion-proof valve to malfunction.

[0038] In some embodiments of this utility model, the cover plate base 1 is provided with a liquid injection hole, which is sealed by a sealing nail.

[0039] In this invention, during battery assembly, electrolyte is injected into the battery through the injection hole to ensure that the cell can carry out electrochemical reactions normally. The injection hole provides a channel for electrolyte injection, which facilitates control of the injection volume and injection speed. The injection hole can also be used for subsequent venting or replenishment operations.

[0040] In some embodiments of this invention, the housing 2 has an upward-opening cavity, and the opening of the housing 2 is sealed to the battery cover. In this invention, the cavity is used to hold the winding core 7.

[0041] In some embodiments of this utility model, the shell 2 is made of aluminum.

[0042] refer to Figure 1 The working principle of the square battery provided by this utility model is as follows: the positive electrode rivet 6-1, the cover plate base 1, the positive electrode insulating plate 5-1 and the positive electrode pressure plate 4-1 are stacked together in the order from bottom to top, and the cover plate base 1, the positive electrode insulating plate 5-1 and the positive electrode pressure plate 4-1 are fixedly connected by the positive electrode rivet 6-1; wherein, the cover plate base 1 is provided with an explosion-proof valve 8 and a liquid injection hole, the explosion-proof valve 8 is provided with an explosion-proof valve patch 9, and the liquid injection hole is sealed by a sealing nail.

[0043] Similarly, the negative pole rivet 6-2, cover plate base 1, negative pole insulating plate 5-2 and negative pole pressure plate 4-2 are stacked together in the order from bottom to top, and the cover plate base 1, negative pole insulating plate 5-2 and negative pole pressure plate 4-2 are fixedly connected by the negative pole rivet 6-2. Along the direction away from the cover plate base 1, the horizontal plate of the positive electrode L-shaped connecting piece 3-1 is laser welded to the lower part of the positive electrode rivet 6-1 to achieve a fixed connection, and ensure that the vertical plate of the positive electrode L-shaped connecting piece 3-1 extends along a direction perpendicular to and away from the cover plate base 1, wherein the horizontal plate and the vertical plate of the positive electrode L-shaped connecting piece 3-1 are integrally formed. Along the direction away from the cover plate base 1, the horizontal plate of the negative electrode L-shaped connecting piece 3-2 is laser welded to the lower part of the negative electrode rivet 6-2, and the vertical plate of the negative electrode L-shaped connecting piece 3-2 is ensured to extend along a direction perpendicular to and away from the cover plate base 1, wherein the horizontal plate and the vertical plate of the negative electrode L-shaped connecting piece 3-2 are integrally formed. The core 7 is wound with all tabs, and positive tabs 10-1 and negative tabs 10-2 are formed on the left and right sides of the core 7. The core 7 is placed in the cavity of the housing 2. The positive tab 10-1 on one side of the core 7 is laser welded to the vertical plate of the positive L-shaped connecting piece 3-1. The negative tab 10-2 on the other side of the core 7 is laser welded to the vertical plate of the negative L-shaped connecting piece 3-2. Finally, the cover plate base 1 and the housing 2 of the battery are laser welded to complete the assembly of the square battery.

[0044] The beneficial effects of this utility model will be illustrated below through specific embodiments and comparative examples.

[0045] Example 1 The positive electrode rivet 6-1, cover plate base 1, positive electrode insulating plate 5-1, and positive electrode pressure plate 4-1 are stacked together in a bottom-to-top order, and the positive electrode rivet 6-1 is used to fix the cover plate base 1, positive electrode insulating plate 5-1, and positive electrode pressure plate 4-1 in place. The cover plate base 1 is provided with an explosion-proof valve 8 and a liquid injection hole. The negative electrode rivet 6-2, cover plate base 1, negative electrode insulating plate 5-2, and negative electrode pressure plate 4-2 are stacked together in a bottom-to-top order, and the negative electrode rivet 6-2 is used to fix the cover plate base 1, negative electrode insulating plate 5-2, and negative electrode pressure plate 4-2 in place. Along the direction away from the cover plate base 1, the horizontal plate of the positive electrode L-shaped connecting piece 3-1 is laser welded to the lower part of the positive electrode rivet 6-1 to achieve a fixed connection, and ensure that the vertical plate of the positive electrode L-shaped connecting piece 3-1 extends along a direction perpendicular to and away from the cover plate base 1, wherein the horizontal plate and the vertical plate of the positive electrode L-shaped connecting piece 3-1 are integrally formed. Along the direction away from the cover plate base 1, the horizontal plate of the negative electrode L-shaped connecting piece 3-2 is laser welded to the lower part of the negative electrode rivet 6-2, and the vertical plate of the negative electrode L-shaped connecting piece 3-2 is ensured to extend along a direction perpendicular to and away from the cover plate base 1, wherein the horizontal plate and the vertical plate of the negative electrode L-shaped connecting piece 3-2 are integrally formed. The core 7 is wound with all tabs, and positive tabs 10-1 and negative tabs 10-2 are formed on the left and right sides of the core 7. The core 7 is placed in the cavity of the housing 2. The positive tab 10-1 on one side of the core 7 is laser welded to the vertical plate of the positive L-shaped connecting piece 3-1. The negative tab 10-2 on the other side of the core 7 is laser welded to the vertical plate of the negative L-shaped connecting piece 3-2. Then, the cover plate base 1 and the housing 2 of the battery are laser welded to complete the assembly of the square battery. Finally, electrolyte is injected through the injection hole and sealed with sealing nails. An explosion-proof valve patch 9 is attached to the explosion-proof valve 8.

[0046] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A square battery based on a side connecting piece design, characterized in that, It includes a cover plate base (1), a shell (2) and an L-shaped connecting piece. The cover plate base (1) is provided with electrode assemblies at both ends. The electrode assembly includes a pressure plate, an insulating plate and a rivet. The rivet passes through the cover plate base (1), the insulating plate and the pressure plate from bottom to top and is fixedly connected to the pressure plate. The L-shaped connecting piece includes an integrally formed horizontal plate and a vertical plate. The horizontal plate is parallel to the cover plate base (1) and welded to the lower part of the rivet. The vertical plate extends along a direction perpendicular to and away from the cover plate base (1). The housing (2) is provided with a core (7), which is wound with full pole lugs. Pole lugs (10) are formed on both sides of the core (7) and fixedly connected to the vertical plate of the L-shaped connecting piece. The electrode assembly includes a positive electrode assembly and a negative electrode assembly. The positive electrode assembly includes a positive electrode pressure plate (4-1), a positive electrode insulating plate (5-1), and a positive electrode rivet (6-1). The positive electrode rivet (6-1) passes through the cover plate substrate (1), the positive electrode insulating plate (5-1), and the positive electrode pressure plate (4-1) from bottom to top, and is fixedly connected to the positive electrode pressure plate (4-1). The negative electrode assembly includes a negative electrode pressure plate (4-2), a negative electrode insulating plate (5-2), and a negative electrode rivet (6-2). The negative electrode rivet (6-2) passes through the cover plate substrate (1), the negative electrode insulating plate (5-2), and the negative electrode pressure plate (4-2) from bottom to top, and is fixedly connected to the negative electrode pressure plate (4-2). The L-shaped connecting piece is fixedly connected to a positive L-shaped connecting piece (3-1) and a negative L-shaped connecting piece (3-2). The horizontal plate in the positive L-shaped connecting piece (3-1) is fixedly connected to the lower part of the positive rivet (6-1). The horizontal plate in the negative L-shaped connecting piece (3-2) is fixedly connected to the lower part of the negative rivet (6-2). The electrode tab (10) includes a positive electrode tab (10-1) and a negative electrode tab (10-2). The vertical plate in the positive L-shaped connecting piece (3-1) is fixedly connected to the positive electrode tab (10-1). The vertical plate in the negative L-shaped connecting piece (3-2) is fixedly connected to the lower part of the negative electrode tab (10-2).

2. The square battery according to claim 1, characterized in that, The cover plate substrate (1) is provided with an explosion-proof valve (8), and an explosion-proof valve patch (9) is provided on the explosion-proof valve (8).

3. The square battery according to claim 1, characterized in that, The cover plate substrate (1) is provided with a liquid injection hole, which is sealed by a sealing nail.

4. The square battery according to any one of claims 1-3, characterized in that, The housing (2) has an upward-opening cavity, and the opening of the housing (2) is sealed to the cover plate base (1).

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