Lithium battery connecting strip combination structure and lithium battery

Abstract

The utility model provides a lithium battery connecting strip combined structure and a lithium battery. The lithium battery connecting strip combination structure comprises a connecting strip and an insulation support, the connecting strip is used for electrically connecting a connecting piece of a battery cell of a lithium battery with a protection plate, a groove penetrating through the two ends of the insulation support is formed in the insulation support, and the connecting strip is installed in the groove of the insulation support. The lithium battery comprises the lithium battery connecting strip combination structure. According to the utility model, the insulation support provides support for the connecting strip and carries out insulation protection, thereby ensuring the use safety of the connecting strip and being convenient to install and use.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium batteries, and in particular to a lithium battery connecting strip combination structure and a lithium battery. Background Art

[0002] Lithium batteries are a type of battery that uses lithium metal or lithium alloy as positive / negative electrode materials and non-aqueous electrolyte solutions. Due to its advantages such as high energy density, high discharge power, long service life, no memory effect and green environmental protection, lithium batteries have become the mainstream of battery products and are widely used in various fields.

[0003] Lithium batteries are mainly composed of battery cells, protection boards (PCM) and PVC heat shrink film. The battery cells are the power storage part of lithium batteries and determine the quality of the battery. The protection board is a protection circuit module used to protect the battery chip. It controls and protects the battery according to preset protection logic by detecting battery voltage, current, temperature and other parameters. The battery cells and protection boards need to be welded together through connecting sheets or strips to transmit electrical signals between the two.

[0004] Since the connecting piece or connecting strip is responsible for connecting the battery to the circuit, it is usually required to have the functions of carrying current, stabilizing voltage, and preventing circuit short circuit, so it is particularly important that it can work safely and stably. In the process of processing and manufacturing lithium batteries, it is necessary to design the connecting piece or connecting strip appropriately according to the structure of the lithium battery or apply a large number of insulating layers to the connecting piece or connecting strip to achieve the safety of the application of the connecting piece or connecting strip. If the connecting piece or connecting strip is not designed properly, it is easy to cause safety hazards. For example, in the combined structure of the battery cell and the protection board of the 18650 lithium battery, a longer connecting strip is often required to connect the battery cell and the protection board. However, in the process of manufacturing, if the connecting strip is too long, the positive and negative electrodes will touch each other and cause a short circuit. In addition, applying a large number of insulating layers to the connecting piece or connecting strip has the problems of high cost and complicated process.

[0005] Therefore, how to improve the series of conditions during the use of the connecting strip to ensure its safe use is an urgent problem to be solved. Summary of the invention

[0006] The purpose of the utility model is to provide a lithium battery connecting bar combination structure and a lithium battery, which provides support and insulation protection for the connecting bar through an insulating bracket, thereby ensuring the safe use of the connecting bar and facilitating installation and use.

[0007] To achieve the above-mentioned purpose, the utility model provides a lithium battery connecting bar combination structure, including a connecting bar and an insulating bracket for electrically connecting the connecting plate of the lithium battery cell to the protective plate, the insulating bracket having grooves passing through both ends of the insulating bracket, and the connecting bar is installed in the groove of the insulating bracket.

[0008] Preferably, the insulating support is in the shape of a triangular prism, the groove is formed on one side surface of the insulating support, and the other two side surfaces of the insulating support are both concave arc surfaces for tightly fitting with the cylindrical surface of the battery cell.

[0009] Preferably, the connecting strip is installed in the groove of the insulating bracket through a sliding fit connection with the insulating bracket, and is positioned by a limiting mechanism.

[0010] Preferably, the insulating bracket is provided with at least one connecting portion protruding in the groove, and each connecting portion has a roughly T-shaped cross-section; the bottom surface of the connecting strip is formed with a slide groove with a roughly T-shaped cross-section and passing through both ends of the connecting strip; the connecting portion is inserted into the slide groove and moves along the slide groove to achieve the sliding fit connection.

[0011] Preferably, the limiting mechanism includes a limiting column protruding from the groove and two limiting plates formed on the connecting strip; the connecting strip is provided with two openings, and the two limiting plates are formed by the connecting strip extending from the sides of the two openings into the two openings and downward relative to each other; when the connecting strip is slidably connected to the insulating bracket, the limiting column enters between the two limiting plates and abuts against the two limiting plates to position the connecting strip on the insulating bracket.

[0012] Preferably, the connecting strip includes a top wall, two side walls extending vertically downward from opposite sides of the top wall, and two extension arms extending inwardly from the bottoms of the two side walls. The top wall, the two side walls and the two extension arms jointly define the slide groove.

[0013] Preferably, the insulating bracket is further provided with at least one supporting column protruding in the groove for supporting the connecting strip.

[0014] Preferably, the insulating bracket is a plastic bracket, and the connecting bar is a nickel connecting bar.

[0015] The utility model also provides a lithium battery, comprising the lithium battery connecting strip combination structure.

[0016] Preferably, the lithium battery also includes a shell and a battery cell combination, an upper connecting sheet, a lower connecting sheet, an upper PC spacer, a lower PC spacer, and a protective plate arranged in the shell, wherein the protective plate, the upper PC spacer, and the upper connecting sheet are sequentially arranged at the top of the battery cell combination from top to bottom, and the protective plate is electrically connected to the upper connecting sheet; the lower connecting sheet and the lower PC spacer are sequentially arranged at the bottom of the battery cell combination from top to bottom; the lithium battery connecting bar combination structure is located on one side of the battery cell combination, and the two ends of the connecting bar are electrically connected to the lower connecting sheet and the protective plate respectively, wherein the insulating bracket is in the shape of a triangular prism, the groove is formed on one side surface of the insulating bracket, and the other two side surfaces of the insulating bracket are both concave arc surfaces and are respectively tightly matched with the cylindrical surfaces of two adjacent batteries of the battery cell combination.

[0017] The beneficial effects of the utility model: the lithium battery connecting bar combination structure and the lithium battery of the utility model provide support and insulation protection for the connecting bar through the insulating bracket, which is not only easy to install in the lithium battery, but also can realize the insulation protection of the connecting bar, which is safe and reliable, and can reduce the insulation cost and simplify the process flow; and the two ends of the connecting bar can be conveniently connected to the connecting piece and the protection plate of the lithium battery cell at the two ends of the insulating bracket because the groove runs through the two ends of the insulating bracket, thereby avoiding the risk of short circuit caused by the positive and negative electrodes touching each other, and further ensuring the safety of the use of the connecting bar; further, the lithium battery connecting bar combination structure and the lithium battery of the utility model establish a sliding connection between the connecting bar and the insulating bracket The connection is coordinated and then limited by a limiting mechanism, so that the connecting strip can be easily installed and limited on the insulating bracket; furthermore, the insulating bracket of the utility model can adopt a triangular prism structure, and the side of the insulating bracket is a concave arc surface, so that when the lithium battery connecting strip combination structure of the utility model is installed in the lithium battery, the insulating bracket can be fitted with two adjacent cylindrical battery cells of the lithium battery and arranged between the two adjacent battery cells, and the two side surfaces without the connecting strip installed are respectively tightly matched with the cylindrical surfaces of the two adjacent battery cells, which is convenient for positioning the lithium battery connecting strip combination structure between the connecting plate and the protective plate of the battery cell combination, and can keep the lithium battery structure compact, without the need for additional installation space or additional positioning means. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings are only provided for reference and explanation and are not intended to limit the present invention.

[0019] Figure 1 The figure is a schematic diagram of the assembly structure of the lithium battery connecting bar combination structure of the present invention.

[0020] Figure 2 The figure is a schematic diagram of the exploded structure of the lithium battery connecting bar assembly structure of the present invention.

[0021] Figure 3 It is a front view of the lithium battery connecting strip assembly structure of the utility model.

[0022] Figure 4 It is a top view of the lithium battery connecting strip assembly structure of the present utility model.

[0023] Figure 5 It is a cross-sectional view of the lithium battery connecting strip assembly structure of the present utility model.

[0024] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0025] Figure 7 for Figure 5 Enlarged view of point B in the middle.

[0026] Figure 8 It is a schematic diagram of the exploded structure of the lithium battery of the present utility model.

[0027] Fig. 9 It is a schematic diagram of a partial assembly structure of a lithium battery of the present utility model.

[0028] Fig.10 This is a schematic diagram of the assembly structure of the lithium battery of the present utility model. DETAILED DESCRIPTION

[0029] In order to further illustrate the technical means and effects adopted by the present invention, the preferred embodiments of the present invention and the accompanying drawings are described in detail below.

[0030] The utility model provides a lithium battery connecting bar combination structure and a lithium battery comprising the lithium battery connecting bar combination structure, wherein the lithium battery connecting bar combination structure provides support and insulation protection for the connecting bar through an insulating bracket, can ensure the safe use of the connecting bar and is easy to install and use, and is particularly suitable for lithium batteries that require longer connecting bars.

[0031] like Figure 1-Figure 7 As shown, the lithium battery connecting bar combination structure 10 of the utility model includes a connecting bar 11 and an insulating bracket 12 for electrically connecting the connecting plate of the lithium battery cell to the protection plate, and the insulating bracket 12 is formed with a groove 120 passing through both ends of the insulating bracket 12, and the connecting bar 11 is installed in the groove 120 of the insulating bracket 12.

[0032] In this way, when the lithium battery connecting bar combination structure 10 of the utility model is used in a lithium battery, the insulating bracket 12 can provide support and insulation protection for the connecting bar 11, which is not only convenient for installation in the lithium battery, but also can achieve insulation protection of the connecting bar without applying a large amount of insulating layer to the connecting bar, which is safe and reliable and can reduce insulation costs and simplify the process flow; further, the two ends of the connecting bar 11 can conveniently establish electrical connections with the connecting plate and the protection plate of the lithium battery cell at the two ends of the insulating bracket 12 because the groove 120 runs through the two ends of the insulating bracket 12, thereby avoiding the risk of short circuit caused by the positive and negative electrodes touching each other, and further ensuring the safety of the use of the connecting bar.

[0033] Further, preferably, the insulating bracket 12 is in the shape of a triangular prism, the groove 120 is formed on one side of the insulating bracket 12, and the other two side surfaces of the insulating bracket 12 are concave arc surfaces for tightly fitting with the cylindrical surface of the battery cell. The insulating bracket 12 is in the shape of a triangular prism, and both side surfaces of the insulating bracket 12 are concave arc surfaces, so that when the lithium battery connecting strip assembly structure 10 is installed in the lithium battery, the insulating bracket 12 can be fitted with two adjacent battery cells of the lithium battery and set between the two adjacent battery cells, and the two side surfaces of the insulating bracket 12 without the groove 120 are tightly fitted with the cylindrical surfaces of the two adjacent battery cells, which is convenient for positioning the lithium battery connecting strip assembly structure 10 between the connecting plate and the protective plate of the battery cell, and can keep the lithium battery structure compact, without the need for additional installation space or additional positioning means. Therefore, in actual application, the concave arc surface of the side surface of the insulating bracket 12 can be set accordingly to match the cylindrical surface of the battery cell of the lithium battery.

[0034] Of course, the shape of the insulating bracket 12 of the present invention is not limited thereto, and other shapes may also be used to coordinate with the specific structure of the lithium battery for installation and positioning.

[0035] Furthermore, the connecting bar 11 of the lithium battery connecting bar assembly structure 10 of the present invention is installed in the groove 120 of the insulating bracket 12 through a sliding fit connection with the insulating bracket 12 and is positioned by a limiting mechanism.

[0036] Specifically, the insulating bracket 12 is provided with at least one connecting portion 121 protruding from the groove 120, and each connecting portion 121 has a substantially T-shaped cross section. The bottom surface of the connecting strip 11 is formed with a slide groove 110 having a substantially T-shaped cross section and penetrating both ends of the connecting strip 11. When the connecting strip 11 is installed in the insulating bracket 12, the connecting portion 121 is inserted into the slide groove 110 and moved along the slide groove 110, so as to realize the sliding fit connection between the connecting strip 11 and the insulating bracket 12.

[0037] In a preferred embodiment, the connecting strip 11 includes a top wall 111, two side walls 112 extending vertically downward from opposite sides of the top wall 111, and two extension arms 113 extending inwardly from the bottoms of the two side walls 112. The top wall 111, the two side walls 112 and the two extension arms 113 jointly define the slide groove 110.

[0038] The limiting mechanism may include a limiting column 122 protruding from the groove 120 of the insulating bracket 12 and two limiting pieces 114 formed on the connecting strip 11. Specifically, two openings 115 are provided on the connecting strip 11, and the two limiting pieces 114 are formed by the connecting strip 11 extending from the sides of the two openings 115 into the two openings 115 and downwardly relative to each other. When the connecting strip 11 is connected to the insulating bracket 12 by sliding fit, the connecting portion 121 of the insulating bracket 12 is inserted into the slide groove 110 and moves along the slide groove 110 until the limiting column 122 enters between the two limiting pieces 114 and abuts against the two limiting pieces 114, thereby positioning the connecting strip 11 on the insulating bracket 12.

[0039] Through the sliding fit connection between the sliding groove 110 of the connecting strip 11 and the connecting portion 121 of the insulating bracket 12 and the provision of the limiting mechanism, the connecting strip 11 can be conveniently installed and limited on the insulating bracket 12 .

[0040] Furthermore, the insulating bracket 12 is also provided with at least one supporting column 123 protruding from the groove 120 for supporting the connecting bar 11. Preferably, according to the length of the connecting bar 11, the at least one supporting column 123 can be configured as a plurality of supporting columns 123 evenly distributed in the groove 120.

[0041] Furthermore, the insulating support 12 may be a plastic support, and the connecting bar 11 may be a nickel connecting bar.

[0042] like Figure 8-10 As shown, the lithium battery of the present invention includes a shell 20 and a cell assembly 30, an upper connecting plate 40, a lower connecting plate 50, an upper PC spacer 60, a lower PC spacer 70, a protection plate (PCM) 80, and a lithium battery connecting bar assembly structure 10 arranged in the shell 20.

[0043] The protection plate 80 is electrically connected to an output plug 81. The housing 20 may include a PVC heat shrinkable outer film 21, a PVC heat shrinkable inner film 22 and two insulating membranes 23, and the structure of the housing 20 is not limited thereto.

[0044] During assembly, the protection plate 80 , the upper PC spacer 60 , and the upper connecting plate 40 are sequentially arranged on the top of the battery cell assembly 30 from top to bottom, and the protection plate 80 is electrically connected to the upper connecting plate 40 .

[0045] The lower connecting sheet 50 and the lower PC spacer 70 are sequentially arranged at the bottom of the battery cell assembly 30 from top to bottom.

[0046] The lithium battery connecting strip assembly structure 10 is located on one side of the battery cell assembly 30, and the two ends of its connecting strip 11 are electrically connected to the lower connecting piece 50 and the protective plate 80 respectively. The insulating bracket 12 is in the shape of a triangular prism, and the groove 120 is formed on one side of the insulating bracket 12. The other two side surfaces of the insulating bracket 12 are both concave arc surfaces and are respectively tightly matched with the cylindrical surfaces of the two adjacent battery cells of the battery cell assembly 30. In other words, the insulating bracket 12 fits the two adjacent battery cells of the battery cell assembly 30 and is arranged between the two adjacent battery cells. The two side surfaces of the insulating bracket 12 where the groove 120 is not provided are respectively tightly matched with the cylindrical surfaces of the two adjacent battery cells, and the side surface provided with the groove 120 and installed with the connecting strip 11 faces the side of the shell 20. The two ends of the connecting strip 11 located in the groove 120 are respectively electrically connected to the lower connecting piece 50 and the protective plate 80, as shown in FIG. Fig. 9 It can be seen that the design of the lithium battery connecting bar assembly structure 10 of the utility model is convenient for positioning the lithium battery connecting bar assembly structure 10 between the lower connecting plate 50 and the protective plate 80, and can also keep the lithium battery structure compact, without requiring additional installation space or additional positioning means.

[0047] Moreover, the size of the insulating bracket 12 can be designed to match the size of the battery cell of the battery cell assembly 30 so that it can be located between two adjacent battery cells without exceeding the height and width range of the battery cell assembly 30 to ensure the compactness of the lithium battery structure.

[0048] The two insulating membranes 23 of the housing 20 are respectively arranged on opposite sides of the battery cell assembly 30, and the PVC heat shrinkable inner film 22 and the PVC heat shrinkable outer film 21 are wrapped in sequence. Fig. 9 The assembled battery cell assembly 30, upper connecting sheet 40, lower connecting sheet 50, upper PC spacer 60, lower PC spacer 70, protective plate 80 and lithium battery connecting strip assembly structure 10 (output plug 81 at Fig. 9 In addition to the two insulating membranes 23, the output plug 81 passes through the housing 20. Fig.10 shown.

[0049] To sum up, the lithium battery connecting bar combination structure and the lithium battery of the utility model provide support and insulation protection for the connecting bar through the insulating bracket, which is not only easy to install in the lithium battery, but also can achieve insulation protection of the connecting bar without applying a large amount of insulating layer to the connecting bar. It is safe and reliable, and can reduce insulation costs and simplify the process flow; the two ends of the connecting bar can conveniently establish electrical connections with the connecting plate and the protection plate of the lithium battery cell at the two ends of the insulating bracket because the groove runs through the two ends of the insulating bracket, thereby avoiding the risk of short circuit caused by the positive and negative electrodes touching each other, and further ensuring the safety of the use of the connecting bar.

[0050] Moreover, the lithium battery connecting bar combination structure and the lithium battery of the utility model establish a sliding fit connection between the connecting bar and the insulating bracket, and then cooperate with the limiting mechanism for limiting, so that the connecting bar can be easily installed and limited on the insulating bracket.

[0051] Furthermore, the lithium battery connecting bar combination structure and the insulating bracket of the lithium battery of the utility model can adopt a triangular prism structure, and the side of the insulating bracket is a concave arc surface, so that when the lithium battery connecting bar combination structure is installed in the lithium battery, the insulating bracket can be fitted into two adjacent cylindrical battery cells of the lithium battery and arranged between the two adjacent battery cells, and the two side surfaces without the connecting bar installed are respectively tightly matched with the cylindrical surfaces of the two adjacent battery cells, which is convenient for positioning the lithium battery connecting bar combination structure between the connecting plate and the protective plate of the battery cell combination, and can keep the lithium battery structure compact, without requiring additional installation space or additional positioning means.

[0052] As described above, for ordinary technicians in this field, various other corresponding changes and modifications can be made according to the technical scheme and technical concept of the utility model, and all these changes and modifications should fall within the protection scope of the claims of the utility model.

Claims

1. A lithium battery connecting bar assembly structure, characterized in that: It includes a connecting strip and an insulating bracket for electrically connecting the connecting piece of the lithium battery cell to the protection plate. The insulating bracket is formed with grooves that pass through both ends of the insulating bracket, and the connecting strip is installed in the groove of the insulating bracket.

2. The lithium battery connecting bar assembly structure according to claim 1, characterized in that: The insulating support is in the shape of a triangular prism, the groove is formed on one side of the insulating support, and the other two side surfaces of the insulating support are both concave arc surfaces for tightly fitting with the cylindrical surface of the battery core.

3. The lithium battery connecting bar assembly structure according to claim 1, characterized in that: The connecting strip is installed in the groove of the insulating bracket through a sliding fit connection with the insulating bracket, and is positioned by a limiting mechanism.

4. The lithium battery connecting bar assembly structure according to claim 3, characterized in that: The insulating bracket is provided with at least one connecting portion protruding in the groove, and each connecting portion has a roughly T-shaped cross section; the bottom surface of the connecting strip is formed with a slide groove with a roughly T-shaped cross section and passing through both ends of the connecting strip; the connecting portion is inserted into the slide groove and moves along the slide groove to achieve the sliding fit connection.

5. The lithium battery connecting bar assembly structure according to claim 3 or 4, characterized in that: The limiting mechanism includes a limiting column protruding from the groove and two limiting plates formed on the connecting strip; the connecting strip is provided with two openings, and the two limiting plates are formed by the connecting strip extending from the sides of the two openings into the two openings and downwardly relative to each other; when the connecting strip is slidably connected with the insulating bracket, the limiting column enters between the two limiting plates and abuts against the two limiting plates, thereby positioning the connecting strip on the insulating bracket.

6. The lithium battery connecting bar assembly structure according to claim 4, characterized in that: The connecting strip includes a top wall, two side walls extending vertically downward from opposite sides of the top wall, and two extension arms extending inwardly from the bottoms of the two side walls. The top wall, the two side walls and the two extension arms jointly define the slide groove.

7. The lithium battery connecting bar assembly structure according to claim 3, characterized in that: The insulating bracket is also provided with at least one supporting column protruding in the groove for supporting the connecting strip.

8. The lithium battery connecting bar assembly structure according to claim 1, characterized in that: The insulating bracket is a plastic bracket, and the connecting bar is a nickel connecting bar.

9. A lithium battery, characterized in that: It comprises a lithium battery connecting strip combination structure as described in any one of claims 1 to 8.

10. The lithium battery according to claim 9, characterized in that: The lithium battery also includes a shell and a battery cell combination, an upper connecting sheet, a lower connecting sheet, an upper PC spacer, a lower PC spacer, and a protective plate arranged in the shell, wherein the protective plate, the upper PC spacer, and the upper connecting sheet are sequentially arranged at the top of the battery cell combination from top to bottom, and the protective plate is electrically connected to the upper connecting sheet; the lower connecting sheet and the lower PC spacer are sequentially arranged at the bottom of the battery cell combination from top to bottom; the lithium battery connecting bar combination structure is located on one side of the battery cell combination, and the two ends of the connecting bar are electrically connected to the lower connecting sheet and the protective plate respectively, wherein the insulating bracket is in the shape of a triangular prism, the groove is formed on one side surface of the insulating bracket, and the other two side surfaces of the insulating bracket are both concave arc surfaces and are respectively tightly matched with the cylindrical surfaces of two adjacent batteries of the battery cell combination.

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