Battery module and battery pack

Abstract

In the battery module disclosed in the present invention, the cell; and a heat dissipation pressure dissipation member comprising a liquid cooling section and a gas exhaust pressure reduction section, wherein the gas exhaust pressure reduction section is equipped with a pressure reduction passage and an exhaust port communicating with the pressure reduction passage, the liquid cooling section is located on one side of the pressure reduction passage, the liquid cooling section is vertically connected to the gas exhaust pressure reduction section, and the thickness size H1 of two support side walls in the pressure reduction passage is between 5 and 10 mm, and the explosion-proof valve of the cell and the exhaust port are installed in correspondence, thereby exchanging heat between the cell and the liquid cooling section. At the same time, the present invention further discloses a battery pack utilizing the battery module, thereby solving the problem in which the cell is easily damaged by thermal shock in a thermal runaway state when a conventional liquid cooling plate and a pressure reduction plate are combined and molded integrally.

Description

Technology Field

[0001] The present invention relates to the field of battery technology, and in particular to battery modules and battery packs. Background Technology

[0002] In conventional battery packs, liquid cooling plates are generally distributed on the sides of the cells to dissipate heat and release pressure after thermal runaway, and a dedicated pressure reduction passage is installed in the direction of the explosion-proof valve injection from the cell. The aforementioned pressure reduction passage is generally installed on an independently installed pressure reduction plate.

[0003] Therefore, when installing the cell, the exhaust port of the pressure reduction plate and the explosion-proof valve of the cell must be aligned during installation, and the liquid cooling plate must be adjusted as the position of the cell is adjusted. Consequently, a significant amount of time is required to install and adjust the cell, resulting in reduced efficiency. When the liquid cooling plate and the pressure reduction plate are combined as a single unit, a pressure reduction passage is installed inside the pressure reduction plate and a liquid cooling passage is installed inside the liquid cooling plate. Consequently, when the pressure reduction plate and the liquid cooling plate are formed as a single unit, the intersection point between the pressure reduction plate and the liquid cooling plate is the wall thickness of the liquid cooling passage and / or the wall thickness of the pressure reduction passage. Since the gas and material released when the cell is in a thermal runaway state carry a large amount of heat, there is a risk that the intersection point between the pressure reduction plate and the liquid cooling plate may be easily destroyed when subjected to thermal shock from the high-temperature gas and high-temperature material.

[0004] The present invention discloses a battery module, and said battery module,

[0005] cell;

[0006] The device includes a liquid cooling section and a flue gas pressure reduction section, wherein the flue gas pressure reduction section is equipped with a pressure reduction passage and an exhaust port communicating with the pressure reduction passage, the liquid cooling section is located on one side of the pressure reduction passage, the liquid cooling section is vertically connected to the flue gas pressure reduction section, the thickness size H1 of two support side walls in the pressure reduction passage is between 5 and 10 mm, and the explosion-proof valve of the cell and the exhaust port are installed in correspondence, thereby including a heat dissipation pressure reduction member in which the cell and the liquid cooling section exchange heat.

[0007] The battery pack further provided in the present invention includes the battery module described above.

[0008] In summary, the battery module and battery pack provided in the present invention have the following technical effects.

[0009] Since the pressure reduction passage is installed on one side of the pressure reduction passage through a liquid cooling section and the thickness of the supporting side wall in the pressure reduction passage is between 5 and 10 mm, the heat dissipation pressure reduction member has a relatively robust and stable structure overall. Consequently, there is a relatively large concentrated stress at the location where the liquid cooling section and the gas exhaust pressure reduction section intersect each other. This prevents the risk of easy damage when subjected to thermal shock from high-temperature gas and high-temperature material at this location, and ensures the effectiveness and stability of the heat dissipation and pressure reduction functions of the pressure reduction passage, thereby preventing the risk of the pressure reduction passage becoming blocked due to the accumulation of high-temperature material inside the pressure reduction passage. Brief explanation of the drawing

[0010] FIG. 1 is a schematic diagram of the overall structure of the heat dissipation pressure reducing member of the present invention. FIG. 2 is a schematic diagram of a partial structure of the heat dissipation pressure reducing member of the present invention. FIG. 3 is an assembly diagram of a liquid cooling connector and an external tube member in the present invention. Specific details for implementing the invention

[0011] Specifically, as shown in the combination of FIGS. 1 to 3, the battery module provided in the present invention comprises a cell and a heat dissipation pressure reduction member (1), wherein the cell is preferably a rectangular battery, a cylindrical battery, or a prismatic battery, and the largest side of the cell is defined as the large side of the battery. Here, the heat dissipation pressure reduction member (1) is equipped with a liquid cooling division (11) and a gas exhaust pressure reduction member (12), and the liquid cooling division (11) and the gas exhaust pressure reduction member (12) can be integrally molded or installed separately, making production and manufacturing easy. In the exhaust pressure reduction section (12), a pressure reduction passage (13) and an exhaust port (14) communicating with the pressure reduction passage (13) are installed, and as shown in FIG. 1, preferably, the shape and size of the exhaust port (14) are matched to the shape and size of the explosion-proof valve of the cell, and when the explosion-proof valve of the cell and the exhaust port (14) are installed in correspondence, when the cell is in a thermal runaway state, high-temperature gas, smoke, and high-temperature material released from the cell flow into the interior of the pressure reduction passage (13) through the exhaust port (14), and flow and discharge in an orderly manner under the lead action of the pressure reduction passage (13), thereby preventing secondary short circuits or arcing phenomena from occurring in the battery module.

[0012] In this embodiment, the liquid cooling splitter (11) is located on one side of the pressure reduction passage (13), and the support side wall (131) of the liquid cooling splitter (11) and the pressure reduction passage (13) is fixedly connected, which is advantageous for ensuring the overall structural strength of the heat dissipation pressure reduction member (1), and the liquid cooling splitter (11) is vertically connected to the exhaust pressure reduction member (12). When the cell is assembled to the heat dissipation pressure reduction member (1), the large surface of the battery from the cell is joined and contacted to the liquid cooling splitter (11), thereby ensuring that heat exchange between the cell and the liquid cooling splitter (11) occurs at maximum efficiency. Consequently, a large amount of heat released by the cell in a normal charging and discharging state and / or thermal runaway state is transferred to the liquid cooling splitter (11), forming heat exchange between the cell and the liquid cooling splitter (11), and finally, the heat is rapidly dispersed and discharged through the liquid cooling splitter (11), thereby preventing the risk of heat spreading from the battery module.

[0013] As a key aspect of this embodiment, the thickness size H1 of the two support sidewalls (131) in the pressure relief passage (13) is between 5 and 10 mm, and when the thickness size H1 of the support sidewall (131) is less than 5 mm, the thickness size H1 of the support sidewall (131) is excessively thin. When thermal runaway occurs in the cell, the high-temperature gas released from the cell or any high-temperature material sprayed can easily create a thermal shock on the support sidewall (131), thereby easily damaging the pressure relief passage (13). Consequently, the high-temperature gas, or even the high-temperature material, may leak from the damaged point, causing a problem where heat spreads in the battery module. Additionally, during the process of producing and manufacturing the heat dissipation pressure relief member (1), it is difficult to easily mold the support sidewall (131), which may increase the difficulty in producing and manufacturing the heat dissipation pressure relief member (1). At the same time, the supporting side wall (131) must support the weight of at least one cell, and if the supporting side wall (131) is excessively thin, the supporting side wall (131) can easily collapse, thereby destroying the structure of the pressure relief passage (13) and the heat dissipation pressure relief member (1), and the pressure relief passage (13) may lose its function of discharging mist and high-temperature gas in a designated direction. When the thickness size H1 of the support side wall (131) is 10 mm or more, the thickness size H1 of the support side wall (131) becomes excessively thick, and the weight of the heat dissipation pressure reduction member (1) increases, so the total weight of the battery module and battery pack increases, which is disadvantageous for designing the battery to be lightweight. Meanwhile, the unit flow area of ​​the pressure reduction passage (13) is reduced, so there is a risk that all high-temperature material sprayed from the cell will accumulate and block inside the pressure reduction passage (13), causing the cooling, heat dissipation, and pressure reduction functions of the pressure reduction passage (13) to lose effectiveness, and the battery module may be subject to a more serious risk of thermal runaway and heat spreading.

[0014] Since the thickness size of the support side wall (131) is between 5 and 10 mm, the structural strength of the support side wall (131) and the heat dissipation pressure reduction member (1) can be ensured, and the risk of destruction due to thermal shock can be reduced or prevented. This not only prevents the risk of high-temperature material accumulating and blocking the pressure reduction passage (13), but also ensures the effectiveness of the heat dissipation and pressure reduction functions of the pressure reduction passage (13), thereby ensuring better stability and safety when using the battery module and battery pack. Here, preferably, the thickness size H1 of the support side wall (131) is 6 mm, 7 mm, or 8 mm.

[0015] It needs to be explained that the thickness size of the support side wall (131) described above is adjusted and selected within the size range of 5 to 10 mm described above according to the capacitance of the (passenger car) cell, that is, if the capacitance of the cell is relatively small, a relatively small size such as 5 mm can be selected within this range, and if the capacitance of the cell is relatively large, a relatively large size such as 10 mm can be selected within this range.

[0016] In one preferred manner in the embodiment, specifically when combining FIG. 1 and FIG. 2, two pressure reduction passages (13) are installed in the exhaust pressure reduction section (12), and a supporting partition wall (15) is installed between the two pressure reduction passages (13). Here, the supporting partition wall (15) is a solid structure, and the liquid cooling partition section (11) is installed between the two pressure reduction passages (13). When the liquid cooling partition section (11) is fixedly connected to the supporting partition wall (15), the overall structural strength of the heat dissipation pressure reduction member (1) is effectively ensured, making production and manufacturing easy.

[0017] Furthermore, as illustrated in FIG. 2, the thickness size H2 of the support partition wall (15) is between 3 and 6 mm, and when the thickness size H2 of the support partition wall (15) is less than 3 mm, the thickness size H2 of the support partition wall (15) is excessively thin. When thermal runaway occurs in the cell, the high-temperature gas released from the cell or any high-temperature material sprayed can easily create a thermal shock to the support partition wall (15) and damage the pressure relief passage (13), so that the high-temperature gas, or even the high-temperature material, may flow into the adjacent pressure relief passage (13) and cause a problem of heat spreading in the battery module. In addition, during the process of producing and manufacturing the heat dissipation pressure relief member (1), it is difficult to easily mold the support partition wall (15), which may increase the difficulty in producing and manufacturing the heat dissipation pressure relief member (1).

[0018] When the thickness size H2 of the support partition wall (15) is 6mm or more, the thickness size H2 of the support partition wall (15) becomes excessively thick, and the weight of the heat dissipation pressure reduction member (1) increases, so the total weight of the battery module and battery pack increases, which is disadvantageous for designing the battery to be lightweight. Meanwhile, the unit flow area of ​​the pressure reduction passage (13) is reduced, and there is a risk that all high-temperature material emitted and sprayed from the cell will accumulate and block inside the pressure reduction passage (13), causing the heat dissipation and pressure reduction functions of the pressure reduction passage (13) to lose effectiveness, and the battery module may be subject to a more serious risk of thermal runaway and heat spreading.

[0019] Since the thickness size H2 of the support partition wall (15) is between 3 and 6 mm, the structural strength of the support partition wall (15) and the heat dissipation pressure reduction member (1) can be ensured, and the risk of destruction due to thermal shock can be reduced or prevented. This not only prevents the risk of high-temperature material accumulating and blocking the pressure reduction passage (13), but also ensures the effectiveness of the heat dissipation and pressure reduction functions of the pressure reduction passage (13), thereby ensuring better stability and safety when using the battery module and battery pack. Here, preferably, the thickness size H2 of the support partition wall (15) is 5 mm.

[0020] In one preferred manner in the embodiment, specifically as illustrated in FIG. 2, the liquid cooling section (11) comprises a heat exchange plate body (111) and a plurality of heat exchange passages (112), wherein the heat exchange plate body (111) is the side that has the largest area in the liquid cooling section (11) and exchanges heat with the cell, and the direction in which the heat exchange plate body (111) is perpendicular to the flue gas pressure reduction section (12) is defined as the width direction W of the heat exchange plate body (111), and the plurality of heat exchange passages (112) are arranged and installed along the width direction W of the heat exchange plate body (111).

[0021] Accordingly, a heat exchange medium flows into the interior of the heat exchange passage (112), and water or a cooling liquid may be selected as the heat exchange medium. When the large battery surface of the cell and the heat exchange plate body (111) of the liquid cooling partition (11) are connected and in contact, a large amount of heat released from the cell is conducted to the heat exchange medium through the heat exchange plate body (111) of the liquid cooling partition (11), so that the heat exchange medium flows frequently and a large amount of heat is quickly discharged to the outside of the heat dissipation pressure reduction member (1), thereby achieving the purpose of effectively dissipating heat.

[0022] In a further preferred method of the embodiment, specifically combining FIG. 1 and FIG. 2, a first connecting part (161) is installed on one side of the liquid cooling dividing part (11) near the flue gas pressure reducing part (12), and an extension connecting part (16) extends along the extension direction of the heat exchange passage (112), and the length size of the extension connecting part (16) extending along the width direction W of the heat exchange plate body (111) is not limited, and the liquid cooling dividing part (11) is connected to the flue gas pressure reducing part (12) through the extension connecting part (16). The connection indicated herein may be a fixed connection such as a hinge connection or integral molding, or a detachable connection such as an insertion connection or a snap connection.

[0023] In this way, the connection strength between the liquid cooling division part (11) and the exhaust gas pressure reduction part (12) can be improved under the action of the extension connection part (16), thereby preventing the risk of the concentrated stress generated by the vertical connection between the liquid cooling division part (11) and the exhaust gas pressure reduction part (12) being severed at the connection point between the liquid cooling division part (11) and the exhaust gas pressure reduction part (12), and thus further improving the overall structural strength of the heat dissipation pressure reduction member (1).

[0024] In the above description, as shown in the combination of FIG. 2 and FIG. 3, the heat dissipation pressure reduction member (1) described above further includes a liquid cooling connector (17) having a liquid cooling internal cavity (171) installed therein and an external tube member (18) installed on the liquid cooling connector (17), the liquid cooling connector (17) and the liquid cooling division (11) are detachably connected, and the heat exchange passage (112) communicates with the external tube member (18) through the liquid cooling internal cavity (171).

[0025] Specifically, the liquid cooling splitter (11) has a second connecting part (162) further installed in the direction of extension of the heat exchange passage (112), so that the liquid cooling connector (17) can be inserted and connected to the liquid cooling splitter (11) more easily and conveniently. In order to firmly strengthen the connection between the liquid cooling connector (17) and the liquid cooling splitter (11) so that the liquid cooling connector (17) is not easily separated from the liquid cooling splitter (11), a locking projection is installed on one of the inner cavity wall of the liquid cooling inner cavity (17) and the liquid cooling splitter (11), and a fitting groove is installed on the other of the inner cavity wall of the liquid cooling inner cavity (171) and the liquid cooling splitter (11), so that the locking projection is fastened inside the fitting groove.

[0026] Accordingly, the heat exchange medium flows from the liquid-cooled connector (17) to the liquid-cooled inner cavity (171) and then flows into the heat exchange passage (112). Here, a deflector plate (172) is installed in the liquid-cooled inner cavity (171), so that adjacent heat exchange passages (112) are connected from head to tail, and the multiple heat exchange passages (112) are formed into a snake-shaped passage through the deflector plate (172), and the heat exchange medium can flow from bottom to top along the width direction W of the heat exchange plate body (111), or the heat exchange medium can flow from top to bottom along the width direction W of the heat exchange plate body (111), so that the flow path of the heat exchange medium is greatly increased, and the heat exchange time between the heat exchange medium and the cell is increased, so that the utilization rate of the heat exchange medium can be effectively improved.

[0027] In one preferred manner of the embodiment, specifically by combining FIG. 1 and FIG. 2, the number of exhaust ports (14) described above is multiple, and since multiple exhaust ports (14) are installed uniformly along the extension direction of the pressure reduction passage (13), when multiple cells are arranged, if multiple explosion-proof valves and multiple exhaust ports (14) are installed in correspondence with each other, when thermal runaway occurs in any one cell, high-temperature gas, mist, and high-temperature material can flow into the interior of the pressure reduction passage (13) and be discharged to the outside of the heat dissipation pressure reduction member (1) in the battery module through the guidance of the pressure reduction passage (13).

[0028] Thus, in one preferred manner of the present embodiment, the battery module may include a plurality of heat dissipation pressure reduction members (1) and a cell installed and fixed to the heat dissipation pressure reduction member (1). Herein, optionally, the number of cells may be one or a plurality. When a plurality of exhaust ports (14) are installed correspondingly in the exhaust pressure reduction section (12), each cell and each exhaust port are installed correspondingly, and a plurality of heat dissipation pressure reduction members (1) are arranged and installed in sequence, and the pressure reduction passages (13) of two adjacent heat dissipation pressure reduction members (1) are mutually conductive.

[0029] Here, the meaning of being arranged and installed in order should be understood as follows: a plurality of heat dissipation and pressure reduction members (1) are arranged in order along the direction of a heat exchange plate body (111) perpendicular to a liquid cooling partition (11), and the heat exchange plate bodies (111) of the plurality of heat dissipation and pressure reduction members (1) are parallel to each other. When the plurality of heat dissipation and pressure reduction members (1) are arranged and installed in order, the cells of two adjacent heat dissipation and pressure reduction members (1) are connected and in contact, and an insulating plate is installed between the cells of the two parallel-arranged heat dissipation and pressure reduction members (1).

[0030] Specifically, the outer tube members (18) of two adjacent heat dissipation pressure reduction members (1) are connected to each other through a connecting tube passage, and preferably, the connecting tube member is self-deformable so that the connecting tube member can be adjusted according to the gap between the liquid cooling connectors (17) of the two adjacent heat dissipation pressure reduction members (1), and optionally, the connecting tube member is a tube member that is an adjustment structure, and the adjustment structure is used to extend and retract along the axis direction of the connecting tube member so as to be adjusted along the gap between the liquid cooling connectors (17) of the two adjacent heat dissipation pressure reduction members (1).

[0031] Based on the structure and connection relationship of the battery module described above, the battery pack further provided in the present invention includes the battery module described above. Explanation of the symbols

[0032] 1: Heat dissipation pressure relief member 11: Liquid cooling section 111: Heat exchange plate body 112: Heat exchange passage 12: Smoke exhaust pressure reduction section 13: Decompression passage 131: Supporting sidewall 14: Exhaust pipe 15: Supporting dividing wall 16: Extension connection 17: Liquid cooling connector 171: Liquid-cooled internal cavity 172: Deflector Plate 18: External tube member

Claims

Claim 1 In a battery module, a cell; a liquid cooling partition (11) and a flue pressure reduction section (12) are provided, and the flue pressure reduction section (12) is provided with a pressure reduction passage (13) and an exhaust port (14) communicating with the pressure reduction passage (13), the liquid cooling partition (11) is located on one side of the pressure reduction passage (13), the liquid cooling partition (11) is vertically connected to the flue pressure reduction section (12), and the thickness size H1 of two support side walls (131) in the pressure reduction passage (13) is between 5 and 10 mm, and the explosion-proof valve of the cell and the exhaust port (14) are installed in correspondence, and the heat dissipation pressure reduction member (1) is provided for heat exchange between the cell and the liquid cooling partition (11), and two of the pressure reduction passages (13) are provided in the flue pressure reduction section (12), and two of the pressure reduction passages (13) A battery module characterized in that a support partition wall (15) is installed between the two pressure reduction passages (13), the support partition wall (15) is a solid structure, and the liquid cooling partition (11) is installed between the two pressure reduction passages (13) and is fixedly connected to the support partition wall (15). Claim 2 A battery module according to claim 1, characterized in that the thickness size H2 of the support dividing wall (15) is between 3 and 6 mm. Claim 3 A battery module according to claim 1, wherein the liquid cooling division (11) comprises a heat exchange plate body (111) and a plurality of heat exchange passages (112), wherein the heat exchange plate body (111) is defined as a direction perpendicular to the exhaust gas pressure reduction unit (12), i.e., the width direction W of the heat exchange plate body (111), and wherein the plurality of heat exchange passages (112) are arranged and installed along the width direction W. Claim 4 A battery module characterized in that, in paragraph 3, a first connecting part (161) is installed on one side of the liquid cooling dividing part (11) close to the gas exhaust pressure reducing part (12), and the liquid cooling dividing part (11) is connected to the gas exhaust pressure reducing part (12) through the first connecting part (161). Claim 5 A battery module according to claim 3, wherein the heat dissipation pressure reduction member (1) further comprises a liquid cooling connector (17) having a liquid cooling internal cavity (171) installed therein and an external tube member (18) installed on the liquid cooling connector (17), wherein the liquid cooling connector (17) and the liquid cooling splitter (11) are detachably connected, and the heat exchange passage (112) communicates with the external tube member (18) through the liquid cooling internal cavity (171). Claim 6 A battery module characterized in that, in claim 5, the liquid cooling splitter (11) has a second connecting part (162) further installed in the direction of extension of the heat exchange passage (112), and the liquid cooling connector (17) is inserted and connected to the liquid cooling splitter (11) through the second connecting part (162). Claim 7 A battery module characterized in that, in claim 5, a deflector plate (172) is installed in the liquid-cooled internal cavity (171), and a plurality of heat exchange passages (112) are formed into snake-shaped passages through the deflector plate (172). Claim 8 A battery module according to claim 1 or 2, wherein the number of exhaust ports (14) is multiple, and the multiple exhaust ports (14) are uniformly installed along the extension direction of the pressure reduction passage (13). Claim 9 A battery module according to claim 1 or 2, comprising a plurality of heat dissipation pressure reduction members (1) and a cell installed and fixed to the heat dissipation pressure reduction members (1), wherein the plurality of heat dissipation pressure reduction members (1) are arranged and installed in sequence, and the pressure reduction passages (13) of two adjacent heat dissipation pressure reduction members (1) are mutually conductive. Claim 10 A battery pack characterized by including a battery module according to any one of claims 1 to 7.

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