Battery pack and power utilization system

Abstract

The utility model discloses a battery pack and a power utilization system. The battery pack comprises a battery cell and a hot melting assembly; the battery core is provided with a pressure relief structure; the hot melting assembly comprises a body and a hot melting part, the body is provided with a hot melting channel and a spraying opening, the hot melting part blocks the hot melting channel and / or the spraying opening, the hot melting channel is suitable for being communicated with the working medium cavity, the spraying opening faces the pressure relief structure, and the hot melting part is located at the pressure relief structure, so that after the hot melting part is melted, the working medium can be sprayed to the pressure relief structure. According to the battery pack disclosed by the utility model, the hot melting part is positioned at the pressure relief structure, so that when a certain battery cell breaks down and flames are ejected from the pressure relief structure, the flames burn the hot melting assembly, and further the temperature of the hot melting assembly is increased; when the temperature of the hot melting assembly is larger than the melting point of the hot melting part, the hot melting part is melted, at the moment, the hot melting channel is opened, and due to the fact that the pressure in the working medium cavity is larger than the atmospheric pressure, the working medium located in the working medium cavity can be sprayed to the pressure relief structure through the spraying opening, and therefore rapid fire extinguishing is achieved.

Description

Technical Field

[0001] The utility model relates to the field of power systems, in particular to a battery pack and a power system. Background Art

[0002] Nowadays, power systems are equipped with battery packs. The battery packs are used to provide power to the power systems. Some battery packs have a spray device in the tray. When a battery cell of the battery pack fails and catches fire, the spray device sprays liquid to the entire battery pack to extinguish the fire.

[0003] The battery pack is equipped with a pressure relief structure, such as a pressure relief valve. When a battery pack fails, high-temperature gas and flames are sprayed out of the battery pack through the pressure relief structure. However, the existing spray device sprays liquid to the entire battery pack, but does not mainly spray liquid to the pressure relief structure of the failed battery cell. The spray device has a large effective area and low fire extinguishing efficiency.

[0004] To this end, the utility model provides a battery pack and a power system to at least partially solve the above problems. Utility Model Content

[0005] A series of simplified concepts are introduced in the utility model content section, which will be further described in detail in the specific embodiments section. The utility model content section of the utility model does not mean to attempt to define the key features and essential technical features of the technical solution claimed for protection, nor does it mean to attempt to determine the scope of protection of the technical solution claimed for protection.

[0006] In order to at least partially solve the above technical problems, the utility model provides

[0007] A battery pack, the battery pack comprising:

[0008] The battery cell is provided with a pressure relief structure;

[0009] A hot melt component includes a main body and a hot melt part. The main body has a hot melt channel and a spraying opening connected to the hot melt channel. The hot melt part blocks the hot melt channel and / or the spraying opening. The hot melt channel is suitable for connecting to a working fluid cavity containing a working fluid. The spraying opening faces the pressure relief structure. The hot melt part is located at the pressure relief structure so that after the hot melt part melts, the working fluid can be sprayed to the pressure relief structure.

[0010] According to the battery pack of the present invention, the hot melt portion is located at the pressure relief structure, so that when a battery cell fails and flames are ejected from the pressure relief structure, the flames burn the hot melt component, thereby increasing the temperature of the hot melt component; when the temperature of the hot melt component is greater than the melting point of the hot melt portion, the hot melt portion melts. At this time, the hot melt channel opens, and since the pressure in the working fluid cavity is greater than the atmospheric pressure, the working fluid in the working fluid cavity can be sprayed to the pressure relief structure through the spray opening, thereby quickly extinguishing the fire.

[0011] Optionally, the battery pack further comprises a cold plate assembly, the cold plate assembly comprising a wall body and a working medium cavity defined by the wall body, the wall body being provided with a cold plate hole connected to the working medium cavity;

[0012] The body is connected to the cold plate assembly, and the hot melt channel is connected to the cold plate hole.

[0013] Optionally, the battery pack further includes a connection joint, the connection joint has a joint channel, the connection joint is fixedly connected to the wall, the joint channel is connected to the cold plate hole, the body is connected to the connection joint, and the hot melt channel is connected to the joint channel.

[0014] Optionally, the body is detachably connected to the connecting fitting.

[0015] Optionally, the cold plate assembly is located above the battery cell.

[0016] Optionally, the battery pack further comprises a tray, the tray having a tray cavity and a top opening, the top opening being connected to the tray cavity, the battery cell being arranged in the tray cavity, and the cold plate assembly being connected to the tray to cover the top opening.

[0017] Optionally, the working medium cavity has a transverse cavity portion and a longitudinal cavity portion, and an extension direction of the transverse cavity portion intersects with an extension direction of the longitudinal cavity portion.

[0018] Optionally, the cold plate hole is located at the intersection of the transverse cavity portion and the longitudinal cavity portion.

[0019] Optionally, a wall provided with cold plate holes is attached to the battery cell.

[0020] Optionally, the hot melt assembly is located on a side of the pressure relief structure away from the center of the battery core along the first horizontal direction.

[0021] Optionally, along the second horizontal direction, the spray opening is located at the pressure relief structure.

[0022] Optionally, the hot melt channel includes a vertical channel section and a horizontal channel section, one end of the vertical channel section is suitable for connecting to the working medium cavity, the other end of the vertical channel section is connected to the horizontal channel section, and one end of the horizontal channel section is connected to the spray opening.

[0023] Optionally, the battery pack includes a cell assembly, the cell assembly includes at least two cells, hot melt assemblies are arranged on both sides of the cell assembly along a first horizontal direction, and the at least two cells are arranged in sequence along a second horizontal direction perpendicular to the first horizontal direction.

[0024] Optionally, the hot melt component is a fusible plug, and / or

[0025] The pressure relief structure is a pressure relief structure.

[0026] The utility model also provides an electricity system, which includes the aforementioned battery pack.

[0027] According to the battery pack of the present invention, the hot melt portion is located at the pressure relief structure, so that when a battery cell fails and flames are ejected from the pressure relief structure, the flames burn the hot melt component, thereby increasing the temperature of the hot melt component; when the temperature of the hot melt component is greater than the melting point of the hot melt portion, the hot melt portion melts. At this time, the hot melt channel opens, and since the pressure in the working fluid cavity is greater than the atmospheric pressure, the working fluid in the working fluid cavity can be sprayed to the pressure relief structure through the spray opening, thereby quickly extinguishing the fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to make the advantages of the utility model more easily understood, the utility model briefly described above will be described in more detail by referring to the specific embodiments shown in the accompanying drawings. It can be understood that these drawings only depict typical embodiments of the utility model and should not be considered as limiting the scope of protection thereof. The utility model is described and explained with additional characteristics and details through the accompanying drawings.

[0029] Figure 1 is a three-dimensional schematic diagram of a battery pack according to a preferred embodiment of the present utility model;

[0030] Figure 2 for Figure 1 An exploded diagram of a battery pack;

[0031] Figure 3 for Figure 1 A three-dimensional schematic diagram of a battery pack in which a cell assembly, a cold plate assembly, a hot melt assembly and a connection connector are connected together;

[0032] Figure 4 for Figure 3 Another three-dimensional schematic diagram of a battery pack in which a cell assembly, a cold plate assembly, a hot melt assembly and a connection connector are connected together;

[0033] Figure 5 for Figure 1 A schematic top view of a cold plate assembly, a hot melt assembly and a connection connector of a battery pack connected together;

[0034] Figure 6 for Figure 1 A schematic cross-sectional view of a battery cell of a battery pack;

[0035] Figure 7 for Figure 1 A bottom view schematic diagram of a battery pack in which a cell assembly, a cold plate assembly, a hot melt assembly and a connection connector are connected together;

[0036] Figure 8 for Figure 1 An exploded schematic diagram of a battery pack in which a cold plate assembly, a hot melt assembly and a connection connector are connected together;

[0037] Fig. 9 for Figure 1 A partial schematic diagram of a cross-sectional view of a battery pack at a hot melt assembly; and

[0038] Fig.10 for Fig. 9 A partial enlarged schematic diagram of the battery pack.

[0039] Description of Reference Numerals

[0040] 110: Battery cell 111: Battery cell shell

[0041] 112: Pole core 113: Positive pole ear

[0042] 114: Negative electrode ear 115: Pressure relief structure

[0043] 120: Cold plate assembly 121: Flow channel plate

[0044] 122: Temperature plate 123: Refrigeration surface

[0045] 124: Cold plate hole 126: Working fluid cavity

[0046] 127: Horizontal cavity portion 128: Vertical cavity portion

[0047] 129: Wall 130: Hot melt component

[0048] 131: Main body 132: Hot melt part

[0049] 133: Hot melt channel 134: Vertical channel section

[0050] 135: Horizontal channel section 136: Spray opening

[0051] 140: Connector 141: Connector channel

[0052] 150: tray 151: bottom wall

[0053] 152: Side wall 153: Tray cavity

[0054] 154: Top opening 160: Liquid inlet pipe

[0055] 170: Liquid outlet pipe 180: Installation interval DETAILED DESCRIPTION

[0056] In the following description, a large number of specific details are given to provide a more thorough understanding of the present invention. However, it is obvious to those skilled in the art that the present invention can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present invention, some technical features known in the art are not described.

[0057] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower" and similar expressions used herein are only for the purpose of illustration and are not intended to be limiting.

[0058] In this document, ordinal numbers such as “first” and “second” cited in the present invention are merely identifiers and do not have any other meanings, such as a specific order.

[0059] In order to thoroughly understand the implementation of the utility model, a detailed structure will be presented in the following description. Obviously, the implementation of the utility model is not limited to the specific details familiar to those skilled in the art. The preferred implementation of the utility model is described in detail below, but in addition to these detailed descriptions, the utility model can also have other implementations.

[0060] The utility model provides a battery pack. The battery pack can be used in an electric system to provide electric energy to the electric system. The electric system can be a vehicle. When a battery cell 110 of the battery pack fails and catches fire, the working fluid in the cold plate assembly 120 can be sprayed to the pressure relief structure 115 of the battery cell 110, thereby extinguishing the fire. For example, the pressure relief structure can be a pressure relief valve. The following description is based on the electric system being a vehicle.

[0061] It is understood that in embodiments not shown, the pressure relief structure may also be other structures of the battery cell, as long as the high-temperature gas and flame can be ejected out of the battery cell through the pressure relief structure when the battery pack fails. For example, the pressure relief structure may be a location where the thickness of the aluminum-plastic film of the battery cell is relatively thin, so that when the battery pack fails, the location where the thickness of the film is relatively thin is destroyed and ejects the high-temperature gas and flame.

[0062] Herein, the first horizontal direction D1 is parallel to the length direction of the vehicle. The second horizontal direction D2 is parallel to the width direction of the vehicle. The vertical direction D3 is parallel to the height direction of the vehicle. In this way, the first horizontal direction D1 is perpendicular to the second horizontal direction D2. Both the first horizontal direction D1 and the second horizontal direction D2 are perpendicular to the vertical direction D3.

[0063] It can be understood that in an embodiment not shown, the first horizontal direction is parallel to the width direction of the vehicle, and the second horizontal direction is parallel to the length direction of the vehicle.

[0064] Please refer to Figures 1 to 10The battery pack includes a battery cell 110 and a hot melt assembly 130, and the battery cell 110 is provided with a pressure relief structure 115. The hot melt assembly 130 includes a body 131 and a hot melt portion 132, the body 131 has a hot melt channel 133 and a spraying opening 136 connected to the hot melt channel 133, the hot melt portion 132 blocks the hot melt channel 133, the hot melt channel 133 is suitable for connecting to a working medium cavity 126 containing a working medium, the spraying opening 136 faces the pressure relief structure 115, and the hot melt portion 132 is located at the pressure relief structure 115, so that after the hot melt portion 132 melts, the working medium can be sprayed to the pressure relief structure 115.

[0065] It is understood that in an embodiment not shown, the hot melt portion blocks the hot melt channel and the spray opening.

[0066] Preferably, the battery pack also includes a cold plate assembly 120 , the cold plate assembly 120 has a wall 129 and a working fluid cavity 126 defined by the wall 129 , the wall 129 is provided with a cold plate hole 124 connected to the working fluid cavity 126 , the body 131 is connected to the cold plate assembly 120 , and the hot melt channel 133 is connected to the cold plate hole 124 .

[0067] Preferably, the battery pack further includes a tray 150 , the tray 150 has a tray cavity 153 and a top opening 154 , the top opening 154 is connected to the tray cavity 153 , the battery cell 110 is disposed in the tray cavity 153 , and the cold plate assembly 120 is connected to the tray 150 to cover the top opening 154 .

[0068] Preferably, the battery pack includes a cell assembly, the cell assembly includes at least two cells 110, hot melt assemblies 130 are provided on both sides of the cell assembly along the first horizontal direction D1, and at least two cells 110 are arranged in sequence along the second horizontal direction D2.

[0069] Specifically, Figures 1 to 10 , the tray 150 includes a bottom wall 151 and a side wall 152. The bottom wall 151 is connected to one end of the side wall 152 to form a substantially rectangular parallelepiped structure. The tray 150 is connected to the vehicle. At this time, the first horizontal direction D1 is parallel to the length direction of the tray 150, the width direction of the tray 150 is parallel to the second horizontal direction D2, and the height direction of the tray 150 is parallel to the vertical direction D3. The bottom wall 151 and the side wall 152 form a tray cavity 153 and a top opening 154. The top opening 154 is connected to the tray cavity 153. The battery cell assembly is located in the tray cavity 153. In this way, the bottom wall 151 of the tray 150 can support the battery cell assembly.

[0070] Please continue to refer to Figures 1 to 10 , the cold plate assembly 120 is connected to the upper end of the tray 150. The cold plate assembly 120 covers the top opening 154. In this way, the cold plate assembly 120 is located above the battery cell assembly. The cold plate assembly 120 and the tray 150 can protect the battery cell assembly.

[0071] like Figures 2 to 5 As shown, the battery cell assembly includes at least two battery cells 110. The at least two battery cells 110 are electrically connected to each other. For example, the at least two battery cells 110 are connected in series in sequence.

[0072] It is understandable that in an embodiment not shown, at least two battery cells may also be connected in parallel.

[0073] Each battery cell 110 is provided with a pressure relief structure 115 .

[0074] like Figures 7 to 10 As shown, the cold plate assembly 120 includes a wall body 129. The wall body 129 includes a flow channel plate 121 and a temperature averaging plate 122. The flow channel plate 121 and the temperature averaging plate 122 are both metal plates. The flow channel plate 121 is pressed to form a flow channel groove. The temperature averaging plate 122 is attached to the flow channel plate 121 to form a working medium cavity 126 at the flow channel groove. The side of the temperature averaging plate 122 away from the flow channel plate 121 is a cooling surface 123. The cooling surface 123 faces the battery cell 110. The temperature averaging plate 122 is provided with a cold plate hole 124. The cold plate hole 124 is connected to the working medium cavity 126.

[0075] Please return Figures 1 to 8 , the cold plate assembly also includes a liquid inlet pipe 160 and a liquid outlet pipe 170. The liquid inlet pipe 160 and the liquid outlet pipe 170 are both connected to the flow channel plate 121. The liquid inlet pipe 160 and the liquid outlet pipe 170 are separated. The internal channel of the liquid inlet pipe 160 and the internal channel of the liquid outlet pipe 170 are both connected to the flow channel cavity. When the battery pack is set in a vehicle, it can be connected to the air-conditioning system of the vehicle through the liquid inlet pipe 160 and the liquid outlet pipe 170, so that the working fluid (liquid) of the air-conditioning system can enter the working fluid cavity 126. In this way, the cold plate assembly 120 can adjust the temperature of the battery cell assembly. The working fluid in the working fluid cavity 126 is in a high pressure state. For example, the pressure of the working fluid in the working fluid cavity 126 is approximately 5 bar.

[0076] Preferably, the wall 129 provided with the cold plate hole 124 is attached to the battery cell 110. Specifically, the cooling surface 123 is attached to the upper surface of the battery cell 110. Thus, the temperature of the battery cell assembly can be more effectively adjusted.

[0077] Please refer to Figures 3 to 5 , Figures 7 to 10 , the hot melt assembly 130 is connected to the cold plate assembly 120 through the connection joint 140 described below. The hot melt assembly 130 blocks the cold plate hole 124. Specifically, the hot melt assembly 130 includes a body 131 and a hot melt portion 132. The body 131 has a hot melt channel 133 and a spray opening 136 connected to the hot melt channel 133. The hot melt portion 132 blocks the hot melt channel 133. The body 131 is connected to the cold plate assembly 120 through the connection joint 140 described below. The hot melt channel 133 is connected to the cold plate hole 124.

[0078] The melting point of the hot melt portion 132 is lower than the melting point of the body 131. In this way, when the temperature of the hot melt component 130 is greater than the melting point of the hot melt portion 132, the hot melt portion 132 melts. At this time, the hot melt channel 133 is opened. Since the pressure of the working fluid in the working fluid cavity 126 is greater than the atmospheric pressure (approximately 1 bar), the working fluid in the working fluid cavity 126 can be sprayed out through the spray opening 136. The spray opening 136 faces the pressure relief structure 115. In this way, the sprayed working fluid is sprayed to the pressure relief structure 115.

[0079] The pressure of the ejected working fluid is reduced, part of the working fluid is vaporized from the liquid, and the volume of the working fluid expands. In this way, the ejected working fluid is a gas-liquid two-phase mixture. The liquid phase working fluid in the gas-liquid two-phase mixture easily absorbs heat, thereby taking away the heat of the flame generated by the battery cell 110, thereby playing a role in extinguishing the fire. Furthermore, it can prevent the thermal runaway battery cell 110 (faulty battery cell 110) from causing thermal runaway of other battery cells 110 around it, thereby causing the occurrence of heat spread.

[0080] It is understood that in an embodiment not shown, the body 131 can be directly connected to the air conditioning system of the vehicle so that the hot melt channel 133 is directly connected to the air conditioning system. In this case, the air conditioning system includes a working fluid cavity.

[0081] In this embodiment, the hot melt portion 132 is located at the pressure relief structure 115. In this way, the positions of the hot melt component 130 and the pressure relief structure 115 are set correspondingly. When a certain battery cell 110 fails and a flame is ejected from the pressure relief structure 115, the flame burns the hot melt component 130, thereby increasing the temperature of the hot melt component 130; when the temperature of the hot melt component 130 is greater than the melting point of the hot melt portion 132, the hot melt portion 132 melts, and at this time, the hot melt channel 133 is opened. Since the pressure in the working fluid cavity is greater than the atmospheric pressure, the working fluid in the working fluid cavity 126 can be sprayed to the pressure relief structure 115 through the spray opening 136, thereby quickly extinguishing the fire.

[0082] With the hot melt assembly 130, the battery pack does not need to be provided with an additional spray pipe structure for fire extinguishing, and the battery pack has a simple structure and low cost. In addition, the vehicle does not need to be provided with a battery-powered water pump to transport the fire extinguishing liquid to the spray pipe structure. In the event that the battery pack fails and cannot provide electrical energy, fire extinguishing can still be achieved.

[0083] Preferably, if Figures 8 to 10 As shown, the battery pack further includes a connection joint 140. The connection joint 140 has a joint channel 141. The connection joint 140 is fixedly connected to the wall 129. The joint channel 141 is connected to the cold plate hole 124. The body 131 is connected to the connection joint 140. The hot melt channel 133 is connected to the joint channel 141.

[0084] Specifically, the battery pack further includes a connection joint 140. The connection joint 140 is a sleeve-shaped structure. The connection joint 140 has a joint channel 141. The connection joint 140 protrudes from the cooling surface 123. The connection joint 140 is fixedly connected (for example, welded) to the cooling surface 123. The joint channel 141 is connected to the cold plate hole 124.

[0085] The body 131 is connected to the connection joint 140. At this time, the hot melt assembly 130 and the connection joint 140 are located below the cold plate assembly 120. The hot melt channel 133 is connected to the joint channel 141. Therefore, the installation of the hot melt assembly 130 is convenient.

[0086] like Fig.10 As shown, the body 131 is detachably connected to the connecting joint 140. Thus, the installation of the hot melt assembly 130 is more convenient.

[0087] Further preferably, the body 131 is threadedly connected to the connecting joint 140. Thus, the installation of the hot melt assembly 130 is more convenient.

[0088] It is understood that in an embodiment not shown, the body may be welded or riveted to the temperature absorbing plate.

[0089] Please refer to Figure 5 , Figure 6 , Fig. 9 and Fig.10 The battery cell 110 further includes a positive pole tab 113, a negative pole tab 114, a pole core 112 and a battery cell housing 111. The battery cell housing 111 may be an aluminum alloy part. The pole core 112 is located in the battery cell housing 111. Along the first horizontal direction D1, the positive pole tab 113 is connected to one end of the battery cell housing 111, and the negative pole tab 114 is connected to the other end of the battery cell housing 111. The pressure relief structure 115 is connected to one end of the battery cell housing 111 where the negative pole tab 114 is provided. The pressure relief structure 115 is located above the negative pole tab 114. Along the second horizontal direction D2, the pressure relief structure 115 is located at the negative pole tab 114. As a result, the structure of the battery cell 110 is simple.

[0090] It is understood that in an embodiment not shown, the pressure relief structure is connected to the end of the battery cell housing where the positive electrode tab is provided. The pressure relief structure is located above the positive electrode tab. Along the second horizontal direction D2, the pressure relief structure is located at the positive electrode tab.

[0091] like Figures 2 to 5As shown, at least two battery cells 110 are arranged in sequence along the second horizontal direction D2. Two battery cells 110 adjacent to each other along the second horizontal direction D2 are arranged in opposite directions. Specifically, the two battery cells 110 adjacent to each other along the second horizontal direction D2 include a first battery cell and a second battery cell. Along the first horizontal direction D1, the positive pole tab 113 of the first battery cell and the negative pole tab 114 of the second battery cell are located at the same end of the battery cell assembly. Along the first horizontal direction D1, the negative pole tab 114 of the first battery cell and the positive pole tab 113 of the second battery cell are located at the same end of the battery cell assembly. In this way, it is convenient to connect at least two battery cells 110 in series.

[0092] like Fig. 9 and Fig.10 As shown, the hot melt assembly 130 is located on the side of the pressure relief structure 115 away from the center of the battery cell 110 along the first horizontal direction D1. Specifically, along the first horizontal direction D1, there is an installation gap 180 between the battery cell housing 111 and the side wall 152 of the tray 150. The hot melt assembly 130 is located in the installation gap 180. Along the first horizontal direction D1, the hot melt assembly 130 is located on the side of the pressure relief structure 115 away from the center of the battery cell housing 111. As a result, the structure of the battery pack is simple. In addition, the arrangement of the hot melt assembly 130 in the installation gap 180 facilitates the installation of the cold plate assembly 120.

[0093] Preferably, the pressure relief structure 115 is located at the end of the battery cell 110 along the first horizontal direction D1. Figure 7 and Figure 8 As shown, hot melt assemblies 130 are disposed on both sides of the battery cell assembly along the first horizontal direction D1.

[0094] Further, the hot melt channel 133 includes a vertical channel section 134 and a horizontal channel section 135. One end of the vertical channel section 134 is suitable for connecting to the working medium chamber 126. The other end of the vertical channel section 134 is connected to the horizontal channel section 135. One end of the horizontal channel section 135 is connected to the spray opening 136.

[0095] For details, please refer to Fig. 9 and Fig.10 , the vertical channel section 134 extends along the vertical direction D3. The horizontal channel section 135 extends along the first horizontal direction D1. The upper end of the vertical channel section 134 is connected to the joint channel 141. The vertical channel section 134 is connected to one end of the horizontal channel section 135. The other end of the horizontal channel section 135 is connected to the spray opening 136. Thus, the cold air can be sprayed toward the battery cell 110 through the spray opening 136, which can further accelerate the fire extinguishing.

[0096] like Fig. 9 and Fig.10As shown, along the vertical direction D3, the spray opening 136 is located at the pressure relief structure 115. Thus, more working fluid can be sprayed to the pressure relief structure 115, thereby further accelerating the fire extinguishing.

[0097] like Figure 7 As shown, along the second horizontal direction D2, the spray opening 136 is located at the pressure relief structure 115. In this way, the spray opening 136 faces the pressure relief structure 115. Thus, more working fluid can be sprayed to the pressure relief structure 115, thereby further accelerating the fire extinguishing.

[0098] Preferably, the hot melt component 130 is a fusible plug, thereby facilitating the selection of the hot melt component 130 .

[0099] Please refer to Figure 5 Preferably, the working medium cavity 126 has a transverse cavity portion 127 and a longitudinal cavity portion 128. The extension direction of the transverse cavity portion 127 and the extension direction of the longitudinal cavity portion 128 intersect.

[0100] Specifically, the working fluid cavity 126 has a transverse cavity portion 127 and a longitudinal cavity portion 128. The extension direction of the transverse cavity portion 127 is parallel to the first horizontal direction D1. The extension direction of the longitudinal cavity portion 128 is parallel to the second horizontal direction D2. In this way, the extension direction of the transverse cavity portion 127 and the extension direction of the longitudinal cavity portion 128 intersect. The transverse cavity portion 127 and the longitudinal cavity portion 128 are connected at the intersection. As a result, the working fluid can be evenly distributed in the cold plate assembly 120, and the cold plate assembly 120 can more effectively adjust the temperature of the battery cell assembly. In addition, the working fluid can flow through the transverse cavity portion 127 and the longitudinal cavity portion 128, and can then quickly fill the working fluid cavity 126.

[0101] Furthermore, the cold plate hole 124 is located at the intersection of the transverse cavity portion 127 and the longitudinal cavity portion 128. Thus, the working medium can quickly flow to the cold plate hole 124, thereby further accelerating the fire extinguishing.

[0102] The utility model also provides an electric power system, which includes the aforementioned battery pack.

[0103] In this embodiment, the power system includes the aforementioned battery pack, and the hot melt portion 132 is located at the pressure relief structure 115. In this way, the positions of the hot melt assembly 130 and the pressure relief structure 115 are set correspondingly. When a battery cell 110 fails and a flame is ejected from the pressure relief structure 115, the flame burns the hot melt assembly 130, thereby increasing the temperature of the hot melt assembly 130; when the temperature of the hot melt assembly 130 is greater than the melting point of the hot melt portion 132, the hot melt portion 132 melts, and at this time, the hot melt channel 133 opens, and since the pressure in the working fluid cavity is greater than the atmospheric pressure, the working fluid in the working fluid cavity 126 can be sprayed to the pressure relief structure 115 through the spray opening 136, thereby quickly extinguishing the fire.

[0104] The utility model has been described through the above embodiments, but it should be understood that the above embodiments are only for the purpose of example and description, and are not intended to limit the utility model to the scope of the described embodiments. In addition, it can be understood by those skilled in the art that the utility model is not limited to the above embodiments, and more variations and modifications can be made according to the teachings of the utility model, and these variations and modifications all fall within the scope of protection claimed by the utility model. The protection scope of the utility model is defined by the attached claims and their equivalents.

[0105] Unless otherwise defined, the technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present invention. The terms used herein are only for describing specific implementation purposes and are not intended to limit the present invention. Terms such as "component" and the like appearing herein may represent either a single part or a combination of multiple parts. Terms such as "installation" and "setting" and the like appearing herein may represent either a component being directly attached to another component or a component being attached to another component through an intermediate. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features, unless the feature is not applicable in the other embodiment or otherwise specified.

Claims

1. A battery pack, characterized in that: The battery pack comprises: A battery cell, wherein the battery cell is provided with a pressure relief structure; A hot melt component, the hot melt component includes a main body and a hot melt part, the main body has a hot melt channel and a spraying opening connected to the hot melt channel, the hot melt part blocks the hot melt channel and / or the spraying opening, the hot melt channel is suitable for connecting to a working fluid cavity containing a working fluid, the spraying opening faces the pressure relief structure, and the hot melt part is located at the pressure relief structure so that after the hot melt part melts, the working fluid can be sprayed to the pressure relief structure.

2. The battery pack according to claim 1, characterized in that: The battery pack further comprises a cold plate assembly, wherein the cold plate assembly comprises a wall body and the working medium cavity defined by the wall body, and the wall body is provided with a cold plate hole communicating with the working medium cavity; The body is connected to the cold plate assembly, and the hot melt channel is connected to the cold plate hole.

3. The battery pack according to claim 2, characterized in that: The battery pack also includes a connection joint, which has a joint channel. The connection joint is fixedly connected to the wall, the joint channel is connected to the cold plate hole, the body is connected to the connection joint, and the hot melt channel is connected to the joint channel.

4. The battery pack according to claim 3, characterized in that: The body is detachably connected to the connection joint.

5. The battery pack according to claim 2, characterized in that: The cold plate assembly is located above the battery core.

6. The battery pack according to claim 5, characterized in that: The battery pack further includes a tray having a tray cavity and a top opening, wherein the top opening is communicated with the tray cavity, the battery cell is disposed in the tray cavity, and the cold plate assembly is connected to the tray to cover the top opening.

7. The battery pack according to claim 2, characterized in that: The working medium cavity has a transverse cavity portion and a longitudinal cavity portion, and an extension direction of the transverse cavity portion intersects with an extension direction of the longitudinal cavity portion.

8. The battery pack according to claim 7, characterized in that: The cold plate hole is located at a position where the transverse cavity portion and the longitudinal cavity portion intersect.

9. The battery pack according to claim 2, characterized in that: The wall body provided with the cold plate hole is attached to the battery core.

10. The battery pack according to claim 1, characterized in that: The hot melt assembly is located on a side of the pressure relief structure along a first horizontal direction away from the center of the battery core.

11. The battery pack according to claim 1, characterized in that: Along the second horizontal direction, the spray opening is located at the pressure relief structure.

12. The battery pack according to claim 1, characterized in that: The hot melt channel includes a vertical channel section and a horizontal channel section, one end of the vertical channel section is suitable for connecting to the working medium cavity, the other end of the vertical channel section is connected to the horizontal channel section, and one end of the horizontal channel section is connected to the spray opening.

13. The battery pack according to claim 1, characterized in that: The battery pack includes a battery cell assembly, which includes at least two battery cells. The hot melt assembly is arranged on both sides of the battery cell assembly along a first horizontal direction, and at least two battery cells are arranged in sequence along a second horizontal direction perpendicular to the first horizontal direction.

14. The battery pack according to claim 1, characterized in that: The hot melt component is a fusible plug, and / or The pressure relief structure is a pressure relief structure.

15. An electricity system, characterized in that: The power consumption system comprises the battery pack according to any one of claims 1 to 14.

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