Battery pack

Abstract

The utility model provides a battery pack which comprises a lower box body, an upper cover, an anode silica gel line and a cathode silica gel line, and a battery inner module is arranged in the lower box body; the upper cover is located above the lower box body and connected with the lower box body, and a connector is arranged at a preset position of the upper cover; the positive electrode silica gel line is located between the upper cover and the battery inner module, one end of the positive electrode silica gel line is electrically connected with the battery inner module through a first fastener, and the other end of the positive electrode silica gel line is connected with the connector; the negative electrode silica gel line is located between the upper cover and the battery inner module, one end of the negative electrode silica gel line is electrically connected with the battery inner module through a second fastener, and the other end of the negative electrode silica gel line is connected with the connector. The positive electrode silica gel line and the negative electrode silica gel line are electrically connected with the battery inner module through the fasteners, so that the connection reliability is high, and the heat distribution at the joint is uniform; besides, the conductive insulating adhesive layers are arranged between the battery inner module and the lower box body and between the battery inner module and the upper cover, so that the battery inner module can be fixed, and heat generated by the battery inner module can be efficiently transferred and transferred.

Description

TECHNICAL FIELD

[0001] The utility model belongs to lithium electricity technical field relates to a battery pack. BACKGROUND

[0002] Lithium battery replaces lead-acid battery to serve as energy supply component more and more frequently in various electric equipment with its light weight, long cycle life, large discharge current, energy saving and environmental protection and other advantages. Early lithium battery is used in earphone, watch and mobile phone and other small power electronic equipment, along with lithium battery raw material technology breakthrough, production process promotes, lithium battery more and more in two three electric vehicles, electric vehicles, base station energy storage and other scenes, its use condition and use environment are also more rigorous, need to guarantee its working temperature, voltage and charge-discharge current in a certain range can safely and reliably work long-term, therefore the reliability of battery pack is particularly important.

[0003] The welding spot heat resistance of the existing battery pack is large, and the heat is very serious under the condition of large current, which can easily lead to poor heat distribution of adjacent battery cells, and the welding spot is easy to crack in the process of jolting, which has safety hazards, in addition, the battery cells are easy to displace in the process of jolting, which has safety hazards.

[0004] Therefore, how to provide a battery pack to improve stability and reliability has become a technical problem to be solved by the technical personnel in the field. UTILITY MODEL CONTENTS

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a battery pack to solve the problems of serious heat generation, poor stability and reliability of the battery pack in the prior art.

[0006] To achieve the above-mentioned purposes and other related purposes, the utility model provides a battery pack, which comprises:

[0007] A lower box body comprising a box body side wall and a box body bottom connected, the box body side wall and the box body bottom surround a receiving space with a top opening, and a battery inner module is arranged in the receiving space;

[0008] An upper cover is arranged above the lower box body and connected with the lower box body, and a connecting head is arranged at a preset position of the upper cover;

[0009] A positive electrode silica gel wire is arranged between the upper cover and the battery inner module, one end of the positive electrode silica gel wire is electrically connected with the battery inner module through a first fastener, and the other end of the positive electrode silica gel wire is connected with the connecting head;

[0010] A negative electrode silica gel wire is arranged between the upper cover and the battery inner module, one end of the negative electrode silica gel wire is electrically connected with the battery inner module through a second fastener, and the other end of the negative electrode silica gel wire is connected with the connecting head.

[0011] Optionally, a heat-conducting insulating adhesive layer is arranged between the battery inner module and the upper cover and between the battery inner module and the lower box.

[0012] Optionally, the first fastener comprises a bolt, and the second fastener comprises a bolt.

[0013] Optionally, the battery inner module comprises a positive electrode module, a negative electrode module and a protection plate, the top surface of the positive electrode module is provided with a positive electrode connecting sheet, the top surface of the negative electrode module is provided with a negative electrode connecting sheet, the protection plate is arranged above the positive electrode module and the negative electrode module, and the protection plate is electrically connected with the negative electrode connecting sheet, wherein the positive electrode silica gel wire is electrically connected with the positive electrode connecting sheet through the first fastener, and the negative electrode silica gel wire is electrically connected with the protection plate through the second fastener.

[0014] Optionally, the protection plate and the negative electrode connecting sheet are electrically connected through a third fastener.

[0015] Optionally, an insulating plate is arranged between the positive electrode module and the negative electrode module, and the bottom of the positive electrode module and the bottom of the negative electrode module are mechanically connected through a fourth fastener.

[0016] Optionally, the positive electrode module comprises a positive electrode module fixing support and a plurality of positive electrode module cells, the positive electrode module fixing support is used for fixing and supporting a plurality of the positive electrode module cells, wherein the plurality of positive electrode module cells are stacked in a vertical direction, and the side walls of adjacent positive electrode module cells are welded through a positive electrode metal sheet.

[0017] Optionally, a positive electrode module cell isolation plate is arranged between adjacent positive electrode module cells.

[0018] Optionally, the negative electrode module comprises a negative electrode module fixing support and a plurality of negative electrode module cells, the negative electrode module fixing support is used for fixing and supporting a plurality of the negative electrode module cells, wherein the plurality of positive electrode module cells are stacked in a vertical direction, and the side walls of adjacent negative electrode module cells are welded through a negative electrode metal sheet.

[0019] Optionally, a negative electrode module cell isolation plate is arranged between adjacent negative electrode module cells.

[0020] As described above, in the battery pack, the positive electrode silica gel wire and the negative electrode silica gel wire are electrically connected with the battery inner module through fasteners, the connection reliability is high, the heat distribution at the connection is uniform, the connection is efficient and easy to operate; in addition, the heat-conducting insulating adhesive layer is arranged between the battery inner module and the lower box and between the battery inner module and the upper cover, the battery inner module can be fixed, and the heat generated by the battery inner module can be efficiently transferred and transferred. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 An external schematic view of a battery pack is shown.

[0022] Figure 2 An external schematic view of a battery pack is shown. Figure 1 An internal schematic view of the battery pack is shown.

[0023] Figure 3 An external schematic view of a battery pack is shown.

[0024] Figure 4 An exploded view of a battery pack is shown.

[0025] Figure 5 A schematic view of a battery inner module is shown.

[0026] Figure 6 An exploded view of a battery inner module is shown.

[0027] ELEMENT NUMBER EXPLANATION

[0028] 01 metal shell

[0029] 02 negative power line

[0030] 03 protection plate

[0031] 04 cell

[0032] 05 insulation silk belt

[0033] 06 copper bar

[0034] 07 positive power line

[0035] 08 power line

[0036] 1 lower box body

[0037] 2 battery inner module

[0038] 20 positive module

[0039] 200 positive connection piece

[0040] 21 negative module

[0041] 210 negative connection piece

[0042] 211 negative module fixing support

[0043] 212 negative module cell

[0044] 22 protection plate

[0045] 23 insulating plate

[0046] 24 metal sheet

[0047] 3 upper cover

[0048] 4 positive silicon rubber wire

[0049] 5 negative silicon rubber wire

[0050] 6 heat-conducting insulating adhesive layer DETAILED DESCRIPTION

[0051] Figure 1 shows an external schematic view of a battery pack, Figure 2 shows Figure 1 shows an internal schematic view of the battery pack, wherein a metal shell 01 wraps a battery inner module, only an insulating layer is arranged between the metal shell 01 and the battery inner module; a negative power wire 02 is fixed on a protection plate 03 through a bolt; battery cells 04 are stacked to form a module, the modules are spaced through insulating plates, and the whole is fixed through an insulating silk belt 05; adjacent modules are connected through copper strips 06; a positive power wire 07 is connected with positive tin of the battery inner module; and a negative protection plate is connected with negative tin of the battery inner module through a power wire 08. Figure 1 and Figure 2 The battery pack shown in the figure has the following disadvantages: 1) only an insulating layer is arranged between the metal shell 01 and the battery inner module, in the case of large current discharge, the battery cells generate a large amount of heat, which easily causes temperature protection, so that the protection plate stops working, and the waterproof and dustproof level is insufficient, there is no buffer layer between the battery inner module and the metal shell 01, which easily causes damage to the battery inner module; 2) the modules are fixed through the insulating silk belt 05, which easily causes displacement of the battery cells, so that the whole module is unstable, the non-modular way of stacking the battery cells makes the inside very messy, and the non-modular replacement application not only has low production efficiency but also has great safety hazards; 3) adjacent modules are connected through the copper strips 06, the conductive circuit is exposed, and there is a safety hazard of electric leakage; 4) the soldering connection makes the welding point harden and has large thermal resistance, in the case of large current, a large amount of heat is generated, which easily causes poor heat distribution of adjacent battery cells, and the welding point is hard and brittle and easy to crack when jolting. Therefore, the purpose of the utility model is to provide a battery pack with high stability and high reliability.

[0052] The embodiments of the utility model will be described in detail below through specific examples, and those skilled in the art can easily understand other advantages and effects of the utility model from the disclosure of the specification. The utility model can also be implemented or applied through other different specific embodiments, and various modifications or changes can be made to the details in the specification based on different viewpoints and applications without departing from the spirit of the utility model.

[0053] Please refer to Figures 3 to 6It is to be noted that the drawings provided in the present embodiment only schematically illustrate the basic concept of the present application, and the drawings only show the components related to the present application, rather than being drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in actual implementation can be arbitrarily changed, and the component layout pattern can be more complex.

[0054] The present embodiment provides a battery pack, please refer to Figure 3 and Figure 4 , the battery pack includes a lower box 1, an upper cover 3, a positive electrode silica gel wire 4 and a negative electrode silica gel wire 5, the lower box 1 includes a connected box side wall and a box bottom, the box side wall and the box bottom form a top opening receiving space, the receiving space is provided with a battery inner module 2; the upper cover 3 is located above the lower box 1 and connected with the lower box 1, a predetermined position of the upper cover 3 is provided with a connector; the positive electrode silica gel wire 4 is located between the upper cover 3 and the battery inner module 2, one end of the positive electrode silica gel wire 4 is electrically connected with the battery inner module 2 through a first fastener, the other end of the positive electrode silica gel wire 4 is connected with the connector; the negative electrode silica gel wire 5 is located between the upper cover 3 and the battery inner module 2, one end of the negative electrode silica gel wire 5 is electrically connected with the battery inner module 2 through a second fastener, the other end of the negative electrode silica gel wire 5 is connected with the connector.

[0055] As an example, the lower box 1 and the upper cover 3 are fastened together by M3 bolts to externally protect the battery inner module 2; wherein the upper cover 3 is provided with the connector for leading out the positive electrode silica gel wire 4 and the negative electrode silica gel wire 5 to realize electrical connection between the battery inner module 2 and external devices or power supply.

[0056] As an example, the first fastener adopts a bolt, and the second fastener also adopts a bolt, that is, the positive electrode silica gel wire 4 is fastened on the battery inner module 2 by a bolt, and the negative electrode silica gel wire 5 is fastened on the battery inner module 2 by a bolt. Compared with the problem of unstable connection point and uneven solder joint causing thermal singular point in the prior art, the electrode wire is connected with the battery inner module 2 by a fastener in the present application, which has high connection reliability, uniform heat distribution at the connection, and this connection method is efficient and easy to operate; wherein the positive electrode silica gel wire 4 and the negative electrode silica gel wire 5 both adopt a special soft silica gel wire.

[0057] As an example, a heat-conducting insulating adhesive layer 6 is arranged between the battery inner module 2 and the upper cover 3, and between the battery inner module 2 and the lower box 1. The heat-conducting insulating adhesive layer 6 serves to fix the battery inner module 2, and has a thermal conductivity much higher than that of air, so that the heat generated by the battery inner module 2 can be efficiently transferred and dissipated. At the same time, the heat-conducting insulating adhesive layer 6 forms an isolated environment around the periphery of the battery inner module 2, thereby preventing water and dust from entering.

[0058] As an example, please refer to Figure 5 and Figure 6 The battery inner module 2 includes a positive electrode module 20, a negative electrode module 21, and a protection plate 22. The positive electrode module 20 and the negative electrode module 21 are arranged side by side. The positive electrode module 20 is provided with a positive electrode connecting piece 200 on the top surface, and the negative electrode module 21 is provided with a negative electrode connecting piece 210 on the top surface. The protection plate 22 is arranged above the positive electrode module 20 and the negative electrode module 21, and is electrically connected to the negative electrode connecting piece 210. The positive electrode silica gel wire 4 is electrically connected to the positive electrode connecting piece 200 through the first fastener, and the negative electrode silica gel wire 5 is electrically connected to the protection plate 22 through the second fastener.

[0059] As an example, the negative electrode connecting piece 210 is electrically connected to the negative terminal (P-terminal) of the protection plate 22 through a third fastener, which is a bolt. The negative electrode connecting piece 210 and the protection plate 22 are connected by a bolt, which can position the protection plate 22. Compared with the connection mode of the negative electrode connecting piece 210 and the protection plate 22 by brazing, the application can improve the overcurrent capacity of the connection point, avoid high heat problems of the connection point, prolong the service life of the protection plate 22, and at the same time, the installation is simple and efficient.

[0060] As an example, an insulating plate 24 is arranged between the positive electrode module 20 and the negative electrode module 21 to insulate and separate the positive electrode module 20 and the negative electrode module 21. The positive electrode module 20 and the negative electrode module 21 are mechanically connected by a fourth fastener. The insulating plate 24 is made of an epoxy plate, and the fourth fastener is a bolt.

[0061] As an example, the negative electrode module 21 includes a negative electrode module fixing support 211 for fixing and supporting a plurality of negative electrode module cells 212, and the plurality of negative electrode module cells 212 are stacked in the vertical direction, and the side walls of adjacent negative electrode module cells 212 are welded by a negative electrode metal sheet.

[0062] As an example, a negative electrode module cell isolation plate is arranged between adjacent negative electrode module cells 212, which plays an insulating and shock-absorbing role, wherein the negative electrode module cell isolation plate is made of an epoxy plate.

[0063] Similarly, the positive electrode module 20 includes a positive electrode module fixing support and a plurality of positive electrode module cells, the positive electrode module fixing support is used for fixing and supporting a plurality of positive electrode module cells, and the plurality of positive electrode module cells are stacked in the vertical direction, and the side walls of adjacent positive electrode module cells are welded by a positive electrode metal sheet; a positive electrode module cell isolation plate is arranged between adjacent positive electrode module cells, which plays an insulating and shock-absorbing role.

[0064] As an example, the bottom surface of the positive electrode module 20 and the bottom surface of the negative electrode module 21 are connected by laser spot welding of a metal sheet 24 to realize electrical connection between the positive electrode module 20 and the negative electrode module 21.

[0065] As an example, the positive electrode module 20 and the negative electrode module 21 in the application adopt an integrated modularization mode to modularize the internal modules of the battery pack, and the modules can be combined at will, which is efficient and practical.

[0066] As an example, the battery pack of the application can be applied to high-speed electric motorcycles.

[0067] In summary, in the battery pack of the application, the positive electrode silica gel wire and the negative electrode silica gel wire are electrically connected to the battery internal module by fasteners, the connection is reliable, the heat distribution at the connection is uniform, the connection is efficient and easy to operate; in addition, the conductive insulating adhesive layer is arranged between the battery internal module and the lower box body and between the battery internal module and the upper cover, which can fix the battery internal module and efficiently transfer and transfer the heat generated by the battery internal module. Therefore, the application effectively overcomes the shortcomings of the prior art and has high industrial utilization value.

[0068] The above embodiments only exemplarily illustrate the principles and effects of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A battery pack, characterized by, The application relates to a battery module, which comprises the following parts: a lower box body, which comprises connected box side walls and a box bottom, and which encloses a top-open receiving space, wherein a battery inner module is arranged in the receiving space; an upper cover, which is arranged above the lower box body and is connected with the lower box body, and which is provided with a connecting head at a preset position; a positive electrode silica gel wire, which is arranged between the upper cover and the battery inner module, one end of the positive electrode silica gel wire is electrically connected with the battery inner module through a first fastener, and the other end of the positive electrode silica gel wire is connected with the connecting head; a negative electrode silica gel wire, which is arranged between the upper cover and the battery inner module, one end of the negative electrode silica gel wire is electrically connected with the battery inner module through a second fastener, and the other end of the negative electrode silica gel wire is connected with the connecting head.

2. The battery pack of claim 1, wherein: A heat-conducting insulating adhesive layer is arranged between the battery inner module and the upper cover, and is also arranged between the battery inner module and the lower box body.

3. The battery pack of claim 1, wherein: The first fastener comprises a bolt, and the second fastener comprises a bolt.

4. The battery pack of claim 1, wherein: The battery inner module comprises a positive electrode module, a negative electrode module and a protection plate, the top surface of the positive electrode module is provided with a positive electrode connecting sheet, the top surface of the negative electrode module is provided with a negative electrode connecting sheet, the protection plate is arranged above the positive electrode module and the negative electrode module, and the protection plate is electrically connected with the negative electrode connecting sheet, wherein the positive electrode silica gel wire is electrically connected with the positive electrode connecting sheet through the first fastener, and the negative electrode silica gel wire is electrically connected with the protection plate through the second fastener.

5. The battery pack of claim 4, wherein: The protection plate and the negative electrode connecting sheet are electrically connected through a third fastener.

6. The battery pack of claim 4, wherein: An insulating plate is arranged between the positive electrode module and the negative electrode module, and the bottom of the positive electrode module is mechanically connected with the bottom of the negative electrode module through a fourth fastener.

7. The battery pack of claim 4, wherein: The positive electrode module comprises a positive electrode module fixing support and a plurality of positive electrode module electric cores, the positive electrode module fixing support is used for fixing and supporting the plurality of positive electrode module electric cores, wherein the plurality of positive electrode module electric cores are stacked in a vertical direction, and the side walls of adjacent positive electrode module electric cores are welded through positive electrode metal sheets.

8. The battery pack of claim 7, wherein: Positive electrode module electric core isolation plates are arranged between adjacent positive electrode module electric cores.

9. The battery pack of claim 4, wherein: The negative electrode module comprises a negative electrode module fixing support and a plurality of negative electrode module electric cores, the negative electrode module fixing support is used for fixing and supporting the plurality of negative electrode module electric cores, wherein the plurality of positive electrode module electric cores are stacked in a vertical direction, and the side walls of adjacent negative electrode module electric cores are welded through negative electrode metal sheets.

10. The battery pack of claim 9, wherein: Negative electrode module electric core isolation plates are arranged between adjacent negative electrode module electric cores.

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