A battery pack

Abstract

The utility model embodiment provides battery package, battery package includes battery package box body, a plurality of battery module is arranged in battery package box body, and one or more module output pole bar sheet, module output pole bar sheet connects the output pole of two battery module of adjacent in a plurality of battery module, or connects the output pole of one of a plurality of battery module and the output pole of battery package, wherein, module output pole bar sheet includes fusing part, fusing part includes at least one through -hole in its thickness direction, and the through -hole is provided with heat dissipation material, makes battery package can satisfy the temperature rise demand under the normal charge -discharge working condition again, and also has the safety protection function under the extreme condition.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery pack. Background Technology

[0002] After pouch cells are assembled into a battery module, the battery module's tabs are designed with output terminals (batteries). To address safety issues such as internal and external short circuits within the battery module, fuses are incorporated into the battery terminal structure as a safety protection feature. These fuses can melt and cut off the current path in extreme situations like internal or external short circuits. However, because the overcurrent of the fuses on the battery terminals is small, under normal fast charging conditions, they can affect the temperature of the battery terminals, as well as the temperatures of the connected tabs and cells. Excessive tab temperature can lead to risks such as cell leakage. Completely eliminating the fuses, on the other hand, lacks sufficient safety protection. Therefore, current structural designs, whether with or without fuses, cannot simultaneously meet the battery temperature rise requirements under normal charging and discharging conditions and the battery safety performance under extreme conditions. Utility Model Content

[0003] The purpose of this utility model embodiment is to provide a battery pack that can meet the temperature rise requirements under normal charging and discharging conditions, while also having a certain safety protection function under extreme conditions. The specific technical solution is as follows:

[0004] A battery pack includes: a battery pack housing; a plurality of battery modules disposed within the battery pack housing; and one or more module output terminals, wherein the module output terminals connect to the output terminals of two adjacent battery modules among the plurality of battery modules, or connect the output terminal of one of the plurality of battery modules to the output terminal of the battery pack; wherein the module output terminals include a fusible portion, the fusible portion including at least one through hole formed in its thickness direction, and a heat dissipation material disposed within the through hole.

[0005] In some embodiments of this application, the projection of the through hole in the thickness direction is rectangular or square.

[0006] In some embodiments of this application, the number of through holes in each module's output electrode plate is one; or,

[0007] Each module output electrode has two through holes, which are symmetrically arranged along the central axis of the fuse portion in the width direction, or symmetrically arranged along the central axis of the fuse portion in the length direction; or...

[0008] Each module output electrode has four through holes, which are symmetrically arranged along the central axis in the width direction of the fuse section and along the central axis in the length direction of the fuse section.

[0009] In some embodiments of this application, the heat dissipation material is a phase change material or foam, and the inner wall of the through hole is provided with an adhesive layer, through which the heat dissipation material is connected to the inner wall.

[0010] In some embodiments of this application, the adhesive layer includes double-sided adhesive or thermally conductive adhesive.

[0011] In some embodiments of this application, the phase change material includes paraffin-based phase change material or expanded graphite-based phase change material; the foam includes any one of ethylene-vinyl acetate foam, silicone foam, polyurethane foam or neoprene foam.

[0012] In some embodiments of this application, the heat dissipation material includes any one of expanding foam, thermally conductive adhesive, or potting compound, and an insulating tape is provided at the bottom of the through hole to seal the bottom of the through hole.

[0013] In some embodiments of this application, the materials of the foaming adhesive, thermally conductive adhesive, or potting adhesive include any one of epoxy resin-based materials, silicone-based materials, or polyurethane-based materials.

[0014] In some embodiments of this application, the insulating tape includes any one of polytetrafluoroethylene tape, polyvinyl chloride insulating tape, epoxy film insulating tape, or polyester tape.

[0015] In some embodiments of this application, the material of the module output electrode plate is copper or aluminum.

[0016] Beneficial effects:

[0017] The battery pack provided in this application embodiment has at least one through hole in the thickness direction of the output electrode of the module, which reduces the cross-sectional area of ​​the fusible part. The fusible part can melt and cut off the current path in extreme situations such as short circuits inside or outside the battery module, as a safety protection, thereby improving the battery safety performance in extreme situations. In addition, a heat dissipation material is provided in the through hole. The heat dissipation material absorbs the heat of the output electrode of the module or conducts heat to the output electrode of the module, so as to reduce the temperature of the output electrode of the module under normal fast charging conditions, thereby reducing the temperature of the output electrode and the cell connected to the output electrode of the module, so as to meet the temperature rise requirements of the battery pack under normal charging and discharging conditions.

[0018] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a schematic diagram showing the connection between the battery module and the module output electrode provided in the embodiments of this application;

[0021] Figure 2 for Figure 1 A magnified view of a portion of the image;

[0022] Figure 3 This is a schematic diagram of the structure of a module output electrode plate provided in an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the structure of another module output electrode plate provided in an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the structure of another module output electrode plate provided in an embodiment of this application;

[0025] Figure 6 for Figure 4 The diagram shows the connection between the module output electrode and the battery module;

[0026] Figure 7 for Figure 6 The diagram shows the connection between the module output electrode and the battery module;

[0027] Figure 8 This is a schematic diagram of the structure of another module output electrode plate provided in an embodiment of this application;

[0028] Figure 9 for Figure 8 The diagram shows the connection between the module output electrode and the battery module;

[0029] Figure 10 This application provides a schematic diagram of the structure for the adhesive layer of the module output electrode sheet in an embodiment of the present application.

[0030] Figure 11 This is a schematic diagram of the structure of an insulating tape arrangement for a module output electrode bar provided in an embodiment of this application.

[0031] Explanation of reference numerals in the attached figures:

[0032] Module output electrode 100; fuse 110; through hole 111; first connecting part 120; second connecting part 130;

[0033] Battery module 200; Output terminal 210;

[0034] External component 300; first connecting hole 311. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art based on this application are within the protection scope of the present utility model.

[0036] In order to enable the battery pack to meet the temperature rise requirements under normal charging and discharging conditions, and also to have safety protection functions under extreme conditions, this application provides a battery pack, which will be described in detail below.

[0037] Figure 1 This is a schematic diagram showing the connection between the battery module 200 and the module output electrode 100 provided in the embodiments of this application.

[0038] It includes a battery module 200, a module output electrode 100, and an external electrode connector 300.

[0039] Figure 2 for Figure 1 The enlarged view shows that the module output electrode 100 is connected to the output electrode 210 of the battery module 200. The module output electrode 100 includes a fuse portion 110, which includes at least one through hole 111 opened in its thickness direction, and heat dissipation material is disposed in the through hole 111.

[0040] In some embodiments, one end of the module output electrode 100 can be welded or mechanically fastened to the output electrode 210 of the battery module 200, whereby the output electrode 210 can be either a positive or negative electrode. The other end of the module output electrode 100 can be welded or mechanically fastened to the output electrode of an adjacent battery module or to the output electrode of the battery pack. The battery pack housing is used to house multiple battery modules, serving to support and protect the internal battery modules.

[0041] In some embodiments, multiple battery modules within the battery pack housing are connected in series, parallel, or a combination of both via module output electrodes. A combination of both means that multiple battery modules are connected in both series and parallel configurations. Each battery module contains multiple cells, which are connected in series, parallel, or a combination of both. The cells within the battery module can be pouch cells.

[0042] In some embodiments, each module output electrode 100 is integrally formed, including a first connection portion 120, a fuse portion 110 and a second connection portion 130 connected in sequence. The first connection portion 120 of each module output electrode 100 is connected to the output electrode of the battery module 200, and the second connection portion 130 is connected to the output electrode of another adjacent battery module or the output electrode of the battery pack.

[0043] In other embodiments, two adjacent battery modules, or the output terminals of a battery module and the output terminals of a battery pack, are connected via two module output terminal tabs and an external tab connector 300, such as... Figure 1 and Figure 2 As shown in the figure, another module output electrode is not shown. In this case, the second connecting portion 130 of the module output electrode 100 is connected to the electrode external component 300. The electrode external component 300 is provided with a first connecting hole 311, and the second connecting portion 130 is provided with a second connecting hole. The first connecting hole 311 and the second connecting hole are connected by a fastener, which can be a bolt or a pin.

[0044] See Figure 3 The battery pack provided in this application embodiment includes a fusible portion 110 of the module output electrode 100, which includes at least one through hole 111 formed in its thickness direction. This reduces the cross-sectional area of ​​the fusible portion 110, allowing it to melt and cut off the current path in extreme situations such as internal or external short circuits within the battery module 200, thus providing safety protection and improving battery safety performance under extreme conditions. A heat dissipation material is disposed within the through hole 111. This material absorbs heat from the module output electrode 100 or conducts heat to the module output electrode 100, reducing its temperature under normal fast charging conditions. This, in turn, reduces the temperature of the output electrode 210 and the battery cell connected to the module output electrode 100, thereby ensuring the battery pack meets the temperature rise requirements under normal charging and discharging conditions.

[0045] In some embodiments, the number of through holes 111 in each module output electrode 100 is one.

[0046] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a module output electrode plate provided in an embodiment of this application. The module output electrode plate 100 has one through hole 111, and the processing of the through hole is relatively simple. The orthographic projection of the through hole 111 onto the plane where the bottom of the battery module 200 is located can be... Figure 3The through hole 111 can be a rectangle, a square, or other polygons, or it can be a circle or an ellipse, as long as it can achieve the fusing function; this application does not impose any restrictions on this. In some embodiments of this application, the projection of the through hole 111 in the thickness direction is rectangular or square. The dimensions of the through hole 111 are not particularly limited in the embodiments of this application, as long as the purpose of this invention can be achieved.

[0047] See Figure 4 In some other embodiments of this application, each module output electrode 100 has two through holes 111, and the two through holes 111 are symmetrically arranged along the central axis L2 in the width direction of the fuse portion.

[0048] Or see Figure 5 In some other embodiments of this application, two through holes are symmetrically arranged along the central axis L1 of the fuse portion 110 along its length direction.

[0049] Two through holes 111 are provided on the fuse section 110 and the through holes 111 are symmetrically arranged, so that the through holes 111 on the fuse section 110 have a large area and are evenly distributed, which can improve the heat absorption efficiency or heat conduction efficiency of the heat dissipation material provided in the through holes 111.

[0050] Figure 6 for Figure 4 The diagram shows the connection between the module output electrode and the battery module.

[0051] Figure 7 for Figure 5 The diagram shows the connection between the module output electrode and the battery module.

[0052] See Figure 8 In some other embodiments of this application, each module output electrode 100 has four through holes 111. The four through holes 111 are symmetrically arranged along the central axis L1 in the width direction of the fuse portion 110 and along the central axis L2 in the length direction of the fuse portion. The four through holes 111 on the fuse portion 110 and their symmetrical arrangement make the area of ​​the through holes 111 on the fuse portion 110 larger and more uniformly distributed, which can improve the heat absorption efficiency or heat conduction efficiency of the heat dissipation material disposed in the through holes 111.

[0053] Figure 9 for Figure 8 The diagram shows the connection between the module output electrode and the battery module.

[0054] In some embodiments of this application, the heat dissipation material is a phase change material or foam, and an adhesive layer is provided on the inner wall of the through hole 111. The heat dissipation material is connected to the inner wall of the through hole 111 through the adhesive layer.

[0055] See Figure 10This is a schematic diagram of the structure of the adhesive layer of the module output electrode sheet provided in an embodiment of this application. Figure 10 The shaded areas are where the adhesive layer is applied.

[0056] Since the phase change material or foam itself is a non-adhesive heat dissipation material, an adhesive layer is provided on the inner wall of the through hole 111 to fix the phase change material or foam in the through hole 111. The adhesive layer can be selected from double-sided tape or thermally conductive adhesive.

[0057] When the heat dissipation material is a phase change material, the phase change material includes paraffin-based phase change materials or expanded graphite-based phase change materials. Paraffin-based phase change materials have a large latent heat of phase change, which can absorb or release a large amount of heat, thereby achieving thermal energy storage and release. Furthermore, paraffin-based phase change materials have good thermal stability and can withstand repeated phase change cycles. Expanded graphite-based phase change materials have high thermal conductivity, which can improve the heat transfer efficiency during the phase change process to a certain extent. Heat dissipation materials including any of the above-mentioned phase change materials can improve the heat absorption efficiency of the module output electrode 100, thereby enabling the battery pack to meet the temperature rise requirements under normal charging and discharging conditions.

[0058] When the heat dissipation material is foam, the foam includes any one of ethylene-vinyl acetate foam, silicone foam, polyurethane foam, or neoprene foam. Ethylene-vinyl acetate foam is resistant to acids and alkalis, corrosion, and aging, resulting in a long service life and contributing to improved battery pack lifespan. Silicone foam is lightweight, reducing battery pack weight. Polyurethane foam is low-cost, helping to lower battery pack costs. Neoprene foam has good weather resistance and high chemical stability, resisting electrolytes and acid / alkali corrosion.

[0059] In some other embodiments of this application, the heat dissipation material includes any one of foam, thermally conductive adhesive or potting compound, and an insulating tape is provided at the bottom of the through hole 111 to seal the bottom of the through hole 111.

[0060] See Figure 11 This is a schematic diagram of the structure of the insulating tape arrangement for the module output electrode bar provided in an embodiment of this application. Figure 11 The shaded area represents the part covered with insulating tape.

[0061] Foam, thermally conductive adhesive, or potting compound are inherently viscous heat dissipation materials, so there is no need to place an adhesive layer on the inner wall of the through hole. However, since the foam, thermally conductive adhesive, or potting compound is in liquid or paste form before curing, it is necessary to seal the bottom of the through hole with insulating tape as a base for support, and then apply adhesive to the sealed area of ​​the through hole 111.

[0062] The materials used in expanding foam, thermally conductive adhesives, or potting adhesives include any one of epoxy resin-based materials, silicone-based materials, or polyurethane-based materials. These materials have good thermal conductivity and high bonding strength, which can reduce the possibility of separation from through holes after curing.

[0063] Insulating tapes include any one of polytetrafluoroethylene (PTFE) tape, polyvinyl chloride (PVC) insulating tape, epoxy film insulating tape, or polyester tape. PTFE tape is also known as Teflon tape. PTFE tape, PVC insulating tape, epoxy film insulating tape, and polyester tape have high insulation resistivity and low cost.

[0064] In some embodiments, the module output electrode 100 is made of copper or aluminum. Copper module output electrodes have high conductivity and good ductility, which can adapt to complex bending requirements, reducing the risk of breakage. Furthermore, the oxide layer on the copper surface is stable and can resist corrosion in humid environments without additional plating, further improving the battery pack's lifespan. Aluminum module output electrodes are lighter and less expensive, further reducing the weight and cost of the battery pack.

[0065] In some embodiments, in a battery pack formed using the technology of cell-to-pack (CTP), the module output electrode can be used to connect the output electrodes of two adjacent cells among a plurality of cells, or to connect the output electrode of one of the cells to the output electrode of the battery pack.

[0066] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model are included within the scope of protection of this utility model.

Claims

1. A battery pack, characterized in that, include: Battery pack housing; Multiple battery modules are disposed within the battery pack housing; as well as One or more module output electrodes, wherein the module output electrodes are connected to the output terminals of two adjacent battery modules among the plurality of battery modules, or connected to the output terminal of one of the plurality of battery modules and the output terminal of the battery pack; The module output electrode includes a fusible portion, which includes at least one through hole in its thickness direction, and a heat dissipation material is disposed in the through hole.

2. The battery pack according to claim 1, characterized in that, The projection of the through hole in the thickness direction is rectangular or square.

3. The battery pack according to claim 1, characterized in that, The number of through holes in the output electrode plate of each module is one; or, Each module output electrode has two through holes, which are symmetrically arranged along the central axis of the fuse portion in the width direction, or symmetrically arranged along the central axis of the fuse portion in the length direction; or... Each module output electrode has four through holes, which are symmetrically arranged along the central axis in the width direction of the fuse section and along the central axis in the length direction of the fuse section.

4. The battery pack according to claim 1, characterized in that, The heat dissipation material is a phase change material or foam, and the inner wall of the through hole is provided with an adhesive layer, through which the heat dissipation material is connected to the inner wall.

5. The battery pack according to claim 4, characterized in that, The adhesive layer includes double-sided adhesive or thermally conductive adhesive.

6. The battery pack according to claim 4, characterized in that, The phase change material includes paraffin-based phase change material or expanded graphite-based phase change material; the foam includes any one of ethylene-vinyl acetate foam, silicone foam, polyurethane foam or chloroprene rubber foam.

7. The battery pack according to claim 1, characterized in that, The heat dissipation material includes any one of expanding foam, thermally conductive adhesive, or potting compound, and an insulating tape is provided at the bottom of the through hole to seal the bottom of the through hole.

8. The battery pack according to claim 7, characterized in that, The materials of the foaming adhesive, thermally conductive adhesive, or potting adhesive include any one of epoxy resin-based materials, silicone-based materials, or polyurethane-based materials.

9. The battery pack according to claim 7, characterized in that, The insulating tape includes any one of polytetrafluoroethylene tape, polyvinyl chloride insulating tape, epoxy film insulating tape, or polyester tape.

10. The battery pack according to claim 1, characterized in that, The output electrode of the module is made of copper or aluminum.

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