Battery module with heat dissipation box and battery system thereof

Abstract

The present invention provides a battery module with a heat dissipation box and a battery system thereof, wherein the heat dissipation box is arranged between battery cells stacked in a single axial direction, and the heat dissipation box utilizes a sheet-like supporting part body and a sheet-like current collecting layer of the battery cell to directly contact with a large area, and cooperates with the wings extending on both sides of the sheet-like supporting part to directly contact with the inner wall surface of the metal shell, so as to provide a large-area heat dissipation path for the battery core, thereby greatly improving the efficiency and stability of the battery core.

Description

Technical Field

[0001] The present invention relates to a battery core, and more particularly to a battery module and a battery system in which a heat dissipation box is added between battery units stacked in a single axial direction. Background Art

[0002] In recent years, with the rapid development of various portable electronic products / electric vehicles / energy storage power stations, there is a high demand for energy storage devices with high energy storage density and environmental protection, and ion secondary batteries have become the first choice, and various secondary batteries such as lithium ion secondary batteries, magnesium ion secondary batteries, sodium ion secondary batteries, etc. have been developed. In practice, the most common method is to connect battery cells in parallel to form a battery core in order to achieve sufficient capacity for various devices.

[0003] The existing heat dissipation method of the battery core is to use an additional heat-conducting metal plate / block under the battery core, or to use a metal flow channel through which liquid or gas can flow, so as to remove the heat generated by the battery core during charging and discharging. However, the metal plate or metal flow channel in the structure must be connected to the outside of the battery core to conduct heat (such as a connecting tube, a cooling plate / tube, etc.), which will increase the structure of the overall battery, and the joints of the added components (such as welding points, etc.) may reduce the cooling effect of the battery core, and make the battery assembly process complicated.

[0004] In addition, the conventional method of heat dissipation of battery modules is to add a cooling system or cooling plate to the battery module. In this way, the overall volume of the battery module will increase and it will be difficult to evenly cool the battery module. Similarly, the battery assembly process will become more complicated. Summary of the invention

[0005] The main purpose of the present invention is to provide a battery module with a heat dissipation box and a battery system thereof, wherein the heat dissipation box is directly contacted with the sheet-shaped current collecting layer of the battery unit in a large-area direct contact manner to provide a large-area heat dissipation path for the battery core.

[0006] Another object of the present invention is to provide a battery module with a heat dissipation box and a battery system thereof, wherein the joints of two adjacent battery modules are stacked in an up-and-down staggered manner, thereby reducing the overall volume of the battery system.

[0007] The present invention provides a battery module with a heat dissipation box body, which includes a battery core, a metal shell and at least one heat dissipation box body. The battery core is formed by a plurality of battery cells stacked in a single axial direction. Each battery cell is a complete and independent module, which includes two sheet-shaped current collecting layers and an electrochemical system arranged therein. The heat dissipation box body has a sheet-shaped supporting portion and at least one wing portion extending from the edge of the sheet-shaped supporting portion. The sheet-shaped supporting portion is arranged between any two battery cells and directly contacts the sheet-shaped current collecting layers with the same polarity arranged on the two battery cells, and the wing portion contacts the inner wall surface of the metal shell to provide a large-area heat dissipation path for the battery core, thereby greatly improving the efficiency and stability of the battery core.

[0008] On the other hand, the present invention proposes a battery system, which is composed of a plurality of battery modules with heat dissipation boxes as described above, wherein the upper cover and the lower cover of the metal shell form a joint protruding outward, and the joints of adjacent battery modules are staggered with each other, thereby reducing the overall volume of the battery system; the gap formed by the joint can be set as a hot runner, so that the battery system does not need to be additionally provided with a heat dissipation system, further reducing the overall volume of the battery structure.

[0009] The following detailed description is made through specific embodiments to make it easier to understand the purpose, technical content, characteristics and effects achieved by the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1A , Figure 1B FIG. 1 is a schematic diagram of a battery module with a heat dissipation box according to the present invention.

[0011] Figure 2A FIG. 4 is a schematic diagram of a battery unit of a battery module with a heat dissipation box according to the present invention.

[0012] Figure 2B FIG. 2 is a schematic diagram of another embodiment of a battery unit of a battery module with a heat dissipation housing according to the present invention.

[0013] Figure 2C It is a schematic diagram of an exploded view of a battery unit of a battery module with a heat dissipation box body according to the present invention.

[0014] Figure 3A , Figure 3B It is a schematic diagram of the heat dissipation box body of the present invention.

[0015] Figure 4A , Figure 4B FIG. 2 is a schematic diagram of another embodiment of a battery module with a heat dissipation housing according to the present invention.

[0016] Figure 5A , Figure 5B FIG. 2 is a schematic diagram of another embodiment of a battery module with a heat dissipation housing according to the present invention.

[0017] Fig. 6A , Figure 6B FIG. 2 is a schematic diagram of another embodiment of a battery module with a heat dissipation housing according to the present invention.

[0018] Figure 7 It is a schematic diagram of a battery system using a battery module with a heat dissipation box according to the present invention.

[0019] Reference numerals

[0020] 1 Battery Module

[0021] 11 Battery Cell

[0022] 20 battery cells

[0023] 201 Electrochemical Systems

[0024] 21 Isolation layer

[0025] 22, 23 Active material layer

[0026] 24, 25 Sheet-shaped current collecting layer

[0027] 26 Frame glue

[0028] 261 modified silica gel layer

[0029] 262 modified silica gel layer

[0030] 263 Silicone layer

[0031] 30 Metal Shell

[0032] 301 Joint

[0033] 31 Upper cover

[0034] 32 Lower cover

[0035] 33 Insulation sheet

[0036] 40 heat sink

[0037] 401 Insulation layer

[0038] 41 Sheet-shaped bearing part

[0039] 42 Wing

[0040] 51 Connection terminal

[0041] 71 Hot runner DETAILED DESCRIPTION

[0042] In order to make the advantages, spirit and features of the present invention more easily and clearly understood, the following will be described and discussed in detail with reference to the embodiments and drawings. It should be stated that these embodiments are only representative embodiments of the present invention, and are not intended to limit the implementation of the present invention and the claims to only these embodiments. The purpose of providing these embodiments is only to make the disclosure of the present invention more thorough and easy to understand.

[0043] The terms used in the various embodiments disclosed in the present invention are only used for the purpose of describing specific embodiments, and are not intended to limit the various embodiments disclosed in the present invention. Unless otherwise clearly indicated, the singular form used also includes the plural form. Unless otherwise specified, all terms (including technical terms and scientific terms) used in this specification have the same meanings as those commonly understood by technicians in the field to which the various embodiments disclosed in the present invention belong. The above terms (such as those defined in a generally used dictionary) will be interpreted as having the same meaning as the contextual meaning in the same technical field, and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments disclosed in the present invention.

[0044] In the description of this specification, reference to the terms "an embodiment", "a specific embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments in a suitable manner.

[0045] In the description of the present invention, unless otherwise specified or limited, it should be noted that the terms "coupling", "connection" and "setting" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components, which can be directly connected or connected through an intermediate medium. For those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0046] See also Figure 1A , Figure 1B The battery module 1 with heat dissipation box disclosed in the present invention includes a battery core 11, a metal shell 30 and at least one heat dissipation box 40. The battery core 11 is formed by stacking multiple battery units 20 in a single axial direction, as shown in the figure as a vertical (Z-axis) stack. The electrical connection method can be series, parallel or a combination of series and parallel, and each battery unit 20 is a complete and independent module, which is described in detail below.

[0047] See also Figure 2A , Figure 2CThe present invention uses a complete and independent battery cell 20 to form a battery core 11. The battery cell 20 includes two sheet-shaped current collecting layers 24 and 25, an electrochemical system 201 and a frame glue 26. The electrochemical system 201 includes an isolation layer 21, two active material layers 22 and 23, and an electrolyte system impregnated / mixed in the active material layers 22 and 23. The material of the isolation layer 21 can be selected from polymer materials, ceramic materials or glass fiber materials, or polymer materials or glass fiber materials coated with ceramic powder. The isolation layer 21 has micropores for ions to pass through. The micropores can be in the form of through holes or ant holes (non-linear through-holes), or even directly using porous materials to achieve. Among them, when the ceramic powder is selected from the insulating material, it can be titanium dioxide (TiO2), aluminum oxide (Al2O3), silicon dioxide (SiO2) and other materials of micron and nanometer levels or micron and nanometer levels mixed, or alkylated ceramic particles. The ceramic material can also be selected from oxide solid electrolytes, such as lithium lanthanum zirconium oxide (Li7La3Zr2O 12 LLZO) or lithium aluminum titanium phosphate (LATP), etc. In addition, the ceramic material can also be a mixture of the above-mentioned insulating ceramic material and an oxide solid electrolyte. When a ceramic powder stack is used to form the above-mentioned isolation layer, a polymer adhesive can also be included, such as polyvinylidene fluoride (PVDF), polyvinylidene fluoride-co-trichloroethylene (PVDF-HFP), polytetrafluoroethene (PTFE), acrylic acid glue, epoxy resin, polyethylene oxide (PEO), polyacrylonitrile (PAN) or polyimide (PI), etc.

[0048] The electrolyte system is impregnated or mixed in the active material layers 22 and 23, which can be liquid, colloidal, solid electrolyte, or any combination of mixed electrolytes; the active material layers 22 and 23 are isolated by the intermediate isolation layer 21 and constitute the electrochemical system 201, through which the chemical energy can be converted into electrical energy for use (power supply) or electrical energy can be converted into chemical energy and stored in the system (charging), and the conduction and migration of ions can be achieved at the same time, and the generated electrons can be directly conducted outward from the sheet-shaped collector layers 24 and 25. The sheet-shaped collector layers 24 and 25 are commonly made of copper and aluminum, and of course they can also be other metals or metal alloys such as nickel, tin, silver, and gold.

[0049] At the same time, the sheet-like collector layers 24 and 25 cooperate with the frame glue 26 on the periphery to serve as the packaging component of the battery cell 20; the frame glue 26 is a polymer material, and there is no special restriction as long as it can be adhered to the surface of the sheet-like collector layers 24 and 25 and is durable to the electrolyte system. Thermosetting resin is preferred. For example, the material of the glue frame 26 can be epoxy resin, polyethylene, polypropylene, polyurethane, thermoplastic polyimide, silicone resin, acrylic resin, silica gel or ultraviolet curing glue, which is arranged on the periphery of the two sheet-like collector layers 24 and 25, and surrounds and seals the electrochemical system 201 (active material layers 22, 23 and the middle isolation layer 21), and is used to adhere the two sheet-like collector layers 24 and 25 and encapsulate the electrolyte system between the two collector layers 24 and 25 without leakage and without mutual flow with the electrolyte system of other battery cells 20; therefore, the battery cell 20 is an independent and complete power supply module formed by directly using the sheet-like collector layers 24, 25 and the frame glue 26 as the packaging structure.

[0050] In order to make the sealing effect of the sealant 26 better, when the sealant 26 is made of silicone material, the sealant 26 can be designed to have a three-layer structure. Figure 2B The upper and lower layers are modified silicone layers 261 and 262, and the middle layer is a silicone layer 263. The modified silicone layers 261 and 262 on both sides are silicone modified by adjusting the composition ratio of addition-type silicone and condensation-type silicone, or adding additives to make them suitable for bonding heterogeneous materials (that is, the sheet-like collector layers 24 and 25 and the middle silicone layer 263). This design can improve the adhesion between the interfaces, and at the same time, make the overall appearance more complete and the production yield rate also improve.

[0051] Continue back to Figure 1A , Figure 1B The metal shell 30 includes an upper cover 31 and a lower cover 32. An insulating sheet 33 is provided between the upper cover 31 and the lower cover 32 to electrically insulate the upper cover 31 and the lower cover 32. The insulating sheet 33 can be made of insulating materials such as an O-ring or a gasket. The battery cell 11 can be encapsulated therein, and the upper cover 31 and the lower cover 32 are electrically connected to the different polarity ends of the battery cell 11 to form a positive terminal and a negative terminal respectively; as shown in the figure, the positive terminal is formed above the upper cover 31 and the negative terminal is formed below the lower cover 32. The heat dissipation box 40 is inserted between any two battery cells 20 to provide a large area of ​​heat dissipation. Please refer to Figure 3A The heat dissipation box body 40 has a sheet-like supporting portion 41 and at least one wing portion 42 extending from the edge of the sheet-like supporting portion 41. In this figure, the sheet-like supporting portion 41 has wings 42 on two opposite sides. Of course, as shown in FIG. Figure 3B As shown, all four sides may have wings 42 , and the number and shape of the wings 42 are only for illustration and are not intended to limit the use of only these numbers or shapes.

[0052] Continue with simultaneous reference Figure 1A and Figure 3A The heat dissipation box body 40 is made of a metal material with high thermal conductivity. The area of ​​the sheet-like supporting portion 41 is slightly larger than the sheet-like current collecting layers 24 and 25 of the battery unit 20. Therefore, the battery unit 20 can be supported on the sheet-like supporting portion 41 and directly contact the sheet-like current collecting layers 24 and 25 with a large area. The wing portion 42 at the edge of the heat dissipation box body 40 extends in a vertical direction (extends upward in the figure) and directly contacts the inner wall surface of the metal shell 30 (shown as the upper cover 31 in the figure). Therefore, the heat generated by the battery core during charging and discharging can be guided and dissipated.

[0053] Furthermore, Figure 1A As shown, since the battery core 11 is stacked vertically with the battery cells 20, the upper and lower sides of the sheet-shaped carrier portion 41 of the heat dissipation box body 40 are in contact with the battery cells 20, and since the heat dissipation box body 40 is also a conductive material, the battery cells 20 in contact with the two sides are sheet-shaped collector layers 24 and 25 with the same polarity. Furthermore, in order to prevent the inside of the wing portion 42 from contacting the side of the battery cell 20 and causing a short circuit, an insulating layer 401 can be provided inside the wing portion 42 to isolate it.

[0054] At once Figure 1A In terms of the embodiment, the heat sink 40 is arranged at the positive pole, that is, at the position contacting the inner wall of the upper cover 31. Except for the upper and lower sides of the heat sink 40 being in contact with the same polarity, the remaining battery cells 20 are stacked in direct contact with the positive and negative directions in sequence, and then with a plurality of connecting terminals 51, the sheet-shaped current collecting layers 24 and 25 of the same polarity are respectively connected to form a parallel type arrangement; on the other hand, please refer to Figure 1B , the heat dissipation box 40 can also be set at the negative pole, and the other configurations remain the same and will not be repeated here.

[0055] Of course, in addition to a single heat sink 40, two heat sinks 40 may also be provided on a single pole (upper cover 31 or lower cover 32), see Figure 4A , Figure 4B Two heat sinks 40 are provided at the positive pole (upper cover 31) and the negative pole (lower cover 32), respectively, and two parallel battery units 20 at the same polarity are connected by connecting terminals 51 by using at least one side wall of the heat sink 40 as a hollow shape, so as to form a parallel type. For example, see Figure 3A , the upper right or lower left side of the heat dissipation box body 40 can be used for conduction. Figure 3B The wing portion 42 may also be provided with a slot for the connection terminal 51 to pass through; similarly, the number and position of the heat dissipation box 40 may be changed according to actual use requirements.

[0056] Similarly, in addition to the same direction stacking mentioned above, a mixed type of series and parallel connection can also be used. Please refer to Figure 5A , a mixed type of series and parallel connection can be adopted when stacking the battery cells 20, with three battery cells 20 as a group, each having a heat sink 40, and forming an internal parallel connection by stacking them in the positive and negative directions in sequence and coordinating with the setting of the connection terminals 51, and then forming an external series connection type by stacking the three battery cell groups in the same direction. It should be specially explained here that the external and internal connections referred to in this part refer to the parallel and series connection between the inside and outside of the group, for the battery cell group formed by the three battery cells 20, and do not refer to the inside and outside of the battery core 1 (or the metal shell 30); in addition, for the bottom battery cell group, because the part connected to the edge is the negative electrode (the lower cover 32), the location of the heat sink 40 is slightly different from that of the other two groups; in addition, please refer to Figure 5B , then there are four battery cell groups, and the positive electrode (upper cover 31) and the negative electrode (lower cover 32) are both provided with two heat sinks 40, and the connection method is the same as the above Figure 5A The same is true, except that one more battery unit group is extended, and the rest of the connection methods are the same, which will not be repeated here.

[0057] On the other hand, see Fig. 6A , Figure 6B Alternatively, three battery cells 20 may be grouped together and connected in series, that is, the three battery cells 20 are stacked in the same direction, and then the three battery cells 20 are grouped together and stacked in reverse, and the groups are connected in parallel with the connecting terminals 51. In addition, it should be noted that the battery cells 20 of the battery core 11 are stacked in a single axial direction, and the stacking method is not limited to the aforementioned figures and descriptions.

[0058] See also Figure 7 , the present invention utilizes a plurality of the aforementioned battery modules 1 to construct a battery system, wherein the upper cover 31 and the lower cover 31 of the metal shell 30 are electrically insulated by an insulating sheet 33, and a joint portion 301 protruding outward is formed, and the joint portions 301 of adjacent battery modules 1 are mutually staggered, thereby reducing the overall volume of the battery system and improving the unit capacity density of the overall battery system; in addition to the aforementioned use of the heat dissipation box 40 inside the battery module 1 to provide a large-area heat dissipation path for the battery core 11, the gap formed by the joint portion 301 outside the battery module 1 can be used to set up a hot runner 71, so that the battery system does not need to be additionally provided with a heat dissipation system, further reducing the overall volume of the battery structure; similarly, only two battery modules 1 are shown in the figure, and more horizontal arrangement structures can be formed according to needs in actual use.

[0059] In summary, the present invention proposes a battery module with a heat dissipation box and a battery system thereof, wherein the heat dissipation box is directly contacted with the sheet-shaped current collecting layer of the battery unit in a large-area direct contact manner to provide a large-area heat dissipation path for the battery core, which can effectively conduct away the heat generated by the battery core and maintain the optimal performance of the battery core; and in the battery system constructed, the joints of two adjacent battery modules are arranged in an up-and-down staggered manner, thereby reducing the overall volume of the battery system, and the gap formed by the joints can be set as a hot runner, so that the battery system does not need to be additionally provided with a heat dissipation system, further reducing the overall volume of the battery structure.

[0060] The above is only a preferred embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications based on the features and spirit described in the claims of the present invention should be included in the scope of patent protection of the present invention.

Claims

1. A battery module with a heat dissipation box body, the battery module with a heat dissipation box body comprising: A battery cell is formed by stacking a plurality of battery cells in a single axial direction, each of the battery cells comprising: Two sheet-shaped current collecting layers are arranged parallel to each other, and the two sheet-shaped current collecting layers serve as packaging components of the battery unit; and An electrochemical system is disposed between the two sheet-shaped current collecting layers, and the electrochemical system includes an electrolyte system; A metal shell, comprising an upper cover and a lower cover, wherein the upper cover and the lower cover are electrically insulated, the metal shell encapsulates the battery cell therein, and the upper cover and the lower cover are electrically connected to different polarity ends of the battery cell to form a positive terminal and a negative terminal respectively; At least one heat dissipation box body has a sheet-shaped supporting portion and at least one wing portion extending vertically from the edge of the sheet-shaped supporting portion, the sheet-shaped supporting portion is arranged between two of the battery cells and contacts the sheet-shaped current collecting layers with the same polarity arranged on the two battery cells, and the wing portions contact the inner side wall of the metal shell, wherein, The at least one heat dissipation box is made of a heat-conducting and electrically-conducting material, and the area of ​​the sheet-shaped supporting portion is slightly larger than the sheet-shaped current collecting layer of the battery unit; and An insulating layer is disposed on the inner side of the wing of the heat dissipation box to prevent the wing from contacting the side of the battery unit; The electrolyte systems of each of the battery cells do not contact each other.

2. The battery module with a heat dissipation box body according to claim 1, wherein an insulating sheet is further included between the upper cover and the lower cover of the metal shell to prevent the upper cover from being electrically connected to the lower cover. 3 . The battery module with a heat dissipation box according to claim 1 , wherein the electrolyte system is a gel, liquid, solid electrolyte or a combination thereof. 4 . The battery module with a heat dissipation box according to claim 1 , wherein the electrolyte systems of the electrochemical systems do not flow with each other, and the adjacent electrochemical systems only have charge transfer without electrochemical reaction.

5. The battery module with heat dissipation housing according to claim 1, wherein the electrochemical system comprises: Two active material layers, respectively disposed on and in contact with the two sheet-shaped current collecting layers; and an isolation layer disposed between the two active material layers; A frame glue is arranged between the two sheet-shaped current collecting layers and is wound around the electrochemical system. 6 . The battery module with a heat dissipation housing according to claim 5 , wherein the sealant comprises a silicone layer and two modified silicone layers on both sides of the silicone layer.

7. A battery system comprising a plurality of battery modules according to claim 1, wherein the upper cover and the lower cover of the metal shell form a joint portion protruding outward, and the joint portions of adjacent battery modules are staggered with each other.

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