Battery pack

Abstract

Provided is a battery pack that can suppress the phenomenon of a gas exhaust pipe being dented inward of a gas passage cover and damaging a safety valve even when the gas exhaust pipe collides with a workbench or the ground and receives an external force. In a battery pack in which a plurality of single cells having safety valves are stacked, a gas passage cover made of synthetic resin is disposed opposite the safety valves and forms a gas passage through which gas discharged from the safety valves of the plurality of single cells flows. A gas exhaust pipe is formed integrally with the gas passage cover and extends in a direction away from the single cells to discharge the gas of the gas passage to the outside. The gas exhaust pipe is configured not to be dented inward of the gas passage cover when receiving an external force, or the length of the gas exhaust pipe is set such that the gas exhaust pipe does not reach the safety valve even when being dented inward of the gas passage cover when receiving an external force.

Description

Technical Field

[0001] This invention relates to a battery pack consisting of multiple individual cells connected together, and to a battery pack in which each individual cell has a safety valve (vent valve). Background Technology

[0002] For example, electrolyte batteries (hereinafter referred to as lithium-ion batteries), which include positive and negative electrode layers capable of absorbing / releasing lithium ions, are widely used in various fields such as electric vehicles, hybrid vehicles, and energy storage devices due to their high energy density. Additionally, lithium-ion batteries using liquid electrolytes or solid electrolytes are also known.

[0003] A secondary battery using lithium-ion batteries consists of a battery pack that connects multiple individual cells (lithium-ion batteries). The battery pack uses electrode components (hereinafter referred to as busbars) made of conductive metals such as aluminum, copper, and iron to electrically connect the individual cells, thereby obtaining a large amount of power.

[0004] A lithium-ion battery, for example, includes a wound electrode body and a battery can housing the wound electrode body. The battery can includes a box-shaped container, i.e., an outer body, with one side open, and a battery cap that closes the opening of the outer body. Furthermore, in this type of lithium-ion battery, a safety valve is provided on the battery cap to improve safety.

[0005] This safety valve is a battery component designed to release and expel gas from the battery canister at a pre-defined pressure when gas is violently generated inside the battery canister.

[0006] For example, the battery pack described in Japanese Patent Application Publication No. 2007-73298 (Patent Document 1) includes an exhaust passage through which gas discharged from a single cell flows, and an exhaust pipe that discharges the gas flowing through the exhaust passage to the outside. Furthermore, the configuration is such that an exhaust hose is connected to the exhaust pipe, allowing the gas discharged from the single cell to be discharged to any location.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2007-73298 Summary of the Invention

[0010] The technical problem that the invention aims to solve

[0011] The exhaust pipe is formed on the gas passage cover located on the opposite side of the single-cell side of the manifold (equivalent to the upper side when the single-cell side is the lower side), that is, on the upper side of the manifold. The gas passage cover includes an exhaust passage through which gas flows and an exhaust pipe. The exhaust passage is shaped to face the safety valve and is configured to guide the gas discharged from the safety valve to the exhaust pipe.

[0012] Requirements include, for example, preventing the exhaust pipe from affecting surrounding components in the event of accidental drop of the battery pack during transport.

[0013] The purpose of this invention is to provide a battery pack with high safety, which can suppress the impact of the exhaust pipe on surrounding components even if the exhaust pipe is subjected to external force due to collision with the workbench or the ground.

[0014] Technical means to solve the problem

[0015] This invention relates to a battery pack consisting of multiple stacked single cells with safety valves, characterized in that it comprises: a gas passage cover made of synthetic resin, which is disposed opposite to the safety valves and forms an exhaust passage through which gas discharged from the safety valves of the multiple single cells flows; and an exhaust pipe integrally formed with the gas passage cover and extending in a direction away from the single cells to discharge the gas from the exhaust passage to the outside; the exhaust pipe is formed with an anti-denting functional part (dent suppression functional part) that prevents the gas passage cover from denting inward when subjected to external force.

[0016] Furthermore, the present invention is a battery pack consisting of multiple stacked single cells with safety valves, characterized in that it includes: a gas passage cover made of synthetic resin, which is disposed opposite to the safety valves and forms an exhaust passage through which gas discharged from the safety valves of the multiple single cells flows; and an exhaust pipe integrally formed with the gas passage cover, extending in a direction away from the single cells, to discharge the gas from the exhaust passage to the outside; the exhaust pipe is configured such that even if it is recessed inward towards the gas passage cover when subjected to external force, it will not reach the length of the safety valves.

[0017] Invention Effects

[0018] According to the present invention, a highly safe battery pack can be provided, which can suppress the impact on surrounding components even if the exhaust pipe is subjected to external force due to collision with the workbench or the ground. Attached Figure Description

[0019] Figure 1 This is a perspective view of the battery pack according to an embodiment of the present invention.

[0020] Figure 2 From Figure 1 The battery pack with the gas passage cover removed, viewed from the top surface in this state.

[0021] Figure 3 It is Figure 1 The battery pack is disassembled, and for multiple individual cells and holding cells, a portion of the components of the holding cells are disassembled in the width direction Y and the stacking direction X, and a perspective view of the appearance of such a state is taken from an obliquely upward perspective.

[0022] Figure 4 It is to remove Figure 1 The first and second side plates of the battery pack, as well as the fastening bolts, and the components of the battery and retaining cell are separated in the stacking direction X, and the appearance perspective view of such a state is viewed from an obliquely above.

[0023] Figure 5 This is a three-dimensional view of the busbar unit, voltage detection unit, and temperature measurement unit, viewed from an angle above.

[0024] Figure 6 This is a perspective view of the gas passage cover and exhaust pipe used to illustrate technical problems of existing gas passage covers and exhaust pipes.

[0025] Figure 7 This is a longitudinal cross-sectional view of the connection portion between the gas passage cover and the exhaust pipe according to the first embodiment of the present invention.

[0026] Figure 8 This is a perspective view of the connection between the gas passage cover and the exhaust pipe according to the second embodiment of the present invention.

[0027] Figure 9 yes Figure 8 The exhaust pipe shown is a side view.

[0028] Figure 10 yes Figure 8 The diagram shows a longitudinal section of the connection between the gas passage cover and the exhaust pipe.

[0029] Figure 11 yes Figure 8 The diagram shows a longitudinal section of the exhaust pipe.

[0030] Figure 12 It means Figure 8 The diagram shows a longitudinal cross-sectional view of a modified exhaust pipe.

[0031] Figure 13 This is a side view of the connection portion of the exhaust pipe according to the third embodiment of the present invention.

[0032] Figure 14 yes Figure 13 The diagram shows a longitudinal section of the exhaust pipe.

[0033] Figure 15 This is a longitudinal cross-sectional view of the connection portion between the gas passage cover and the exhaust pipe according to the fourth embodiment of the present invention. Detailed Implementation

[0034] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the following embodiments, and various modifications and applications of the technical concept of the present invention are also included within its scope.

[0035] Here, the size or proportions of the constituent parts are sometimes exaggerated in the various figures. Also, the same reference numerals are used for the same structure in the various figures.

[0036] Additionally, in each of the accompanying figures, arrows indicate the stacking direction X, width direction Y, and height direction Z of the battery pack. However, in each figure, the stacking direction X, width direction Y, and height direction Z of the battery pack represent their relative positional relationships within the same figure.

[0037] That is, when the battery pack 1 is rotated 180 degrees so that the upper and lower surfaces are reversed, and when the battery pack 1 is rotated 90 degrees so that the upper surface is arranged as a side, the stacking direction X, width direction Y, and height direction Z of the battery pack will change.

[0038] First, refer to Figures 1-5 Explain the structure of battery pack 1.

[0039] Figure 1 This is a diagram showing the battery pack of an embodiment of the present invention viewed from an oblique angle. Figure 2 Is for Figure 1 The image shows the battery pack with the gas passage cover removed, viewed from the top surface in this state. Figure 3 This is a diagram viewed from an obliquely upward perspective, showing a configuration of multiple individual cells and retaining cells, where a portion of the retaining cell's constituent parts are decomposed in the width direction Y and the stacking direction X. Figure 4 From Figure 3 The diagram shows the state of the battery and retaining unit components separated in the stacking direction X after the first and second side plates and fastening bolts are removed. Figure 5 This is a diagram showing the busbar unit, voltage detection unit, and temperature measurement unit viewed from an angle above.

[0040] Figure 1 In this configuration, battery pack 1 may be configured as a power source for operating an electric motor that drives the vehicle. Alternatively, battery pack 1 may be configured as a power source for operating electrical appliances installed in the vehicle.

[0041] Battery pack 1 Figure 1 As shown, the battery pack 1 includes a plurality of individual cells 100, a holding unit 200 for holding the plurality of individual cells 100, and a busbar unit 300 for electrically connecting the plurality of individual cells 100. Additionally, the battery pack 1 includes a voltage detection unit 400 for detecting the voltage of the individual cells 100, and a temperature measurement unit 500 for measuring the temperature of the individual cells 100. The structure included in the battery pack 1 will be described below.

[0042] Structure of a single cell 100

[0043] Figures 1-4The single cell 100 shown is stacked along the stacking direction X via the holding unit 200. The single cell 100 is as follows... Figure 2 As shown, for example, 20 are stacked. A single cell 100 is, for example, composed of a lithium-ion secondary battery.

[0044] The single cell 100 includes a current collector and an electrolyte. The single cell 100, as shown... Figure 4 As shown, the single battery 100 includes a container 101, a cap 102, a positive terminal 103, a negative terminal 104, and a safety valve 105. The following describes the structure included in the single battery 100.

[0045] 100 single batteries Figure 4 As shown, it is formed into a cuboid shape. On the upper surface 100a of the single cell 100 along the stacking direction X, a positive terminal 103 and a negative terminal 104 are provided.

[0046] upper surface 100a in Figure 4 The middle part corresponds to the upper surface of the single cell 100. The upper surface 100a is formed into a rectangle. The length of the upper surface 100a along the width direction Y of the single cell 100 is greater than the length along the stacking direction X of the single cell 100. The upper surface 100a and Figure 1 The busbar units 300 shown are facing each other.

[0047] The two side surfaces 100b of the single cell 100 along the stacking direction X are orthogonal to and face the upper surface 100a. The side surfaces 100b are rectangular in shape. The length of the side surfaces 100b along the height direction Z of the single cell 100 is greater than the length along the stacking direction X of the single cell 100. The two main surfaces 100c of the single cell 100 facing each other in the stacking direction X are in contact with the single cell spacers 202 of the holding unit 200.

[0048] The current collector of the single cell 100 is equivalent to the charging and discharging body for inputting and outputting power. The current collector of the single cell 100 is formed by winding or stacking the positive and negative electrodes with a separator in between. The current collector and electrolyte are housed in the container 101. The cover 102, together with the container 101, seals the current collector and electrolyte.

[0049] The cover 102 engages with the container 101. The positive terminal 103 and the negative terminal 104 relay the input and output of power between the current collector and the appliance. The positive terminal 103 and the negative terminal 104 are mounted on the cover 102. Along the stacking direction X, the positive terminal 103 of one adjacent single cell 100 and the negative terminal 104 of another single cell 100 are arranged as follows... Figure 4 As shown, they face each other in the stacking direction X.

[0050] Safety valve 105 ruptures outwards from the single cell 100 when the internal pressure of the single cell 100 exceeds a specified value. Safety valve 105 is also called a rupture valve. Safety valve 105 is, for example, installed on the cover 102.

[0051] Structure of Retaining Unit 200

[0052] Holding unit 200 Figures 1-4 As shown, multiple single cells 100 are held. Holding unit 200, as... Figure 4 As shown, it includes a first end spacer 201, a single cell spacer 202, and a second end spacer 203.

[0053] Additionally, the retaining unit 200 includes a first end module 211, a second end module 212, an insulating component 221, and an embedded nut 222. Furthermore, the retaining unit 200 as... Figure 3 As shown, it includes a first side plate 231, a second side plate 232, and a fastening bolt 241. The structure included in the retaining unit 200 will be described below.

[0054] First end spacer 201 Figure 4 As shown, it is disposed between the first end module 211 and the single battery 100. The first end spacer 201 is in contact with the first single battery 100 located at one end of the stacked 20 single batteries 100. This single battery 100 is equivalent to Figure 2 The single battery 100 is located at the left end. The first end spacer 201 insulates the first end module 211 from the single battery 100.

[0055] The first end spacer 201 covers each side of the first end module 211 and the single cell 100 along the width direction Y. The first end spacer 201 covers a portion of the side 100b of the single cell 100 along the stacking direction X. The thickness of the first end spacer 201 along the stacking direction X is sufficiently thin compared to the thickness of the single cell 100 along the stacking direction X. The first end spacer 201 is formed of an insulating material.

[0056] Single cell spacer 202 Figure 4 As shown, a spacer 202 is disposed between adjacent individual cells 100. The individual cell spacer 202 holds adjacent individual cells 100 together and insulates them. The individual cell spacer 202 covers a portion of the respective main surfaces 100c of the adjacent individual cells 100 along the width direction Y and a portion of the respective side surfaces 100b of the adjacent individual cells 100 along the stacking direction X. The thickness of the individual cell spacer 202 along the stacking direction X is sufficiently thin compared to the thickness of the individual cells 100 along the stacking direction X. The individual cell spacer 202 is formed of an insulating material.

[0057] Second end spacer 203 Figure 4As shown, it is disposed between the single battery 100 and the second end module 212. The second end spacer 203 is in contact with the twentieth single battery 100 located at the other end of the stacked 20 single batteries 100. This single battery 100 is equivalent to Figure 2 The single battery 100 is located at the right end. The second end spacer 203 insulates the single battery 100 from the second end module 212.

[0058] The second end spacer 203 covers each side of the first end module 211 and the single cell 100 along the width direction Y. The second end spacer 203 covers a portion of the side 100b of the single cell 100 along the stacking direction X. The thickness of the second end spacer 203 along the stacking direction X is sufficiently thin compared to the thickness of the single cell 100 along the stacking direction X. The second end spacer 203 is formed of an insulating material.

[0059] The first end module 211 is as follows Figure 4 As shown, the first single cell 100 located at one end of the stacked 20 single cells 100 is stacked with the first end spacer 201. The first end module 211 extends along the width direction Y, which intersects the stacking direction X of the single cell 100.

[0060] The first end module 211 is adjacent to the single cell 100 located at the end along the stacking direction X, and supports the single cell 100. The first end module 211 is formed into a cuboid shape extending in the width direction Y. In the first end module 211, the fastening bolt 241 is connected to... Figure 3 The multiple screw holes 211m formed on the side along the width direction Y, as shown, are screwed together. The first end module 211 is as follows... Figure 1 As shown, it is fixed to the first side plate 231 by fastening bolts 241.

[0061] Similarly, the first end module 211 is fixed to the second side plate 232 by fastening bolts 241. Insertion holes 211n are formed on the first end module 211 for inserting bolts or the like that used to fix the battery pack 1. The first end module 211 is made of, for example, metal or resin.

[0062] The second end module 212 is as follows Figure 4 As shown, the twentieth single cell 100, located at the other end of the stacked 20 single cells 100, is stacked with the second end spacer 203. The second end module 212 extends along the width direction Y of the single cell 100.

[0063] The second end module 212 is adjacent to the single cell 100 located at the end along the stacking direction X, and supports the single cell 100. The second end module 212 is formed into a cuboid shape extending in the width direction Y. In the second end module 212, the fastening bolt 241 is connected to... Figure 3 The multiple screw holes formed on the side along the width direction Y, as shown, are screwed together. The second end module 212 is as follows... Figure 1 As shown, it is fixed to the first side plate 231 by fastening bolts 241.

[0064] Similarly, the second end module 212 is fixed to the second side plate 232 by fastening bolts 241. Insertion holes 212n are formed on the second end module 212 for inserting bolts or the like that used to fix the battery pack 1. The second end module 212 is made of, for example, metal or resin.

[0065] Insulating component 221, such as Figure 4 As shown, it is inserted into the first end module 211. Additionally, an insulating member 221 is inserted into the second end module 212. The insulating member 221 is, for example, formed in a cuboid shape. The insulating member 221 is formed of an insulating material.

[0066] The insulating member 221 can, for example, adopt the structure described below. That is, the insulating member 221 can be integrally formed with the first end spacer 201, or it can be formed separately from the first end spacer 201 and then joined to the first end spacer 201. In this case, the first end module 211 has a recess on the surface opposite to the first end spacer 201 for receiving the insulating member 221 along the stacking direction X.

[0067] Similarly, the insulating member 221 can be integrally formed with the second end spacer 203, or it can be formed separately from the second end spacer 203 and then joined to the second end spacer 203. In this case, the second end module 212 has a recess on the surface opposite to the second end spacer 203 for receiving the insulating member 221 along the stacking direction X.

[0068] Embedded nut 222 Figure 3 As shown, it is embedded in a recess formed on the upper surface of the insulating component 221. The embedded nut 222 is fixed to the fastening bolt, for example, through a busbar that communicates with an external control machine.

[0069] First side panel 231 Figure 1 As shown, a first side plate 231 is disposed at one end of the plurality of individual cells 100 along the stacking direction X, in the width direction Y. The first side plate 231 holds the plurality of individual cells 100 along the stacking direction X. The two ends of the first side plate 231 extending along the stacking direction X are bent toward the width direction Y.

[0070] First side panel 231 Figure 3 As shown, the fastening bolt 241 is inserted into a plurality of insertion holes 231m formed on the side surface along the width direction Y. The first side plate 231 is as follows... Figure 1As shown, it is fixed to the first end module 211 and the second end module 212 by fastening bolts 241.

[0071] Second side panel 232 Figure 1 As shown, a plurality of individual cells 100 are arranged at the opposite end of the plurality of individual cells 100 in the width direction Y along the stacking direction X. A second side plate 232 holds the plurality of individual cells 100 along the stacking direction X. The two ends of the second side plate 232 extending along the stacking direction X are bent toward the width direction Y.

[0072] Second side panel 232 Figure 3 As shown, the fastening bolt 241 is inserted into a plurality of insertion holes 232m formed on the side surface along the width direction Y. The second side plate 232 is as follows... Figure 1 As shown, it is fixed to the first end module 211 and the second end module 212 by fastening bolts 241.

[0073] Fastening bolt 241 Figure 2 As shown, the first side plate 231 is fixed to the first end module 211, and the first side plate 231 is fixed to the second end module 212. Additionally, the fastening bolts 241 are as follows: Figure 2 As shown, the second side plate 232 is fixed to the first end module 211, and the second side plate 232 is fixed to the second end module 212.

[0074] Structure of Busbar Unit 300

[0075] Figure 1 , Figure 2 and Figure 5 The busbar unit 300 shown electrically connects multiple individual cells 100. The busbar unit 300 is as follows... Figure 5 As shown, the busbar unit 300 includes a first end busbar 301, a plurality of busbars 302, a second end busbar 303, and a busbar support 311. The structure included in the busbar unit 300 will be described below.

[0076] First end busbar 301 as follows Figure 2 As shown, the positive terminal 103 of the single cell 100 closest to the first end module 211 among the 20 stacked single cells 100 is engaged. The first end busbar 301 is as follows: Figure 5 As shown, it includes a first joint portion 301a in the shape of a plate, a second joint portion 301b in the shape of a plate, a connecting portion 301c in the shape of a bend, and an insertion hole 301d.

[0077] The first joint 301a engages with the busbar that is connected to an external control device. The second joint 301b engages with the positive terminal 103 of the single battery 100. The connecting part 301c connects the first joint 301a and the second joint 301b. An insertion hole 301d is formed on the first joint 301a.

[0078] A fastening bolt is inserted into the insertion hole 301d. The first joint 301a and the busbar that communicates with the external control mechanism are joined by the fastening bolt. The first end busbar 301 is formed of aluminum, for example. If the first end busbar 301 is formed of a cladding material, for example, the first joint 301a is formed of copper and the second joint 301b is formed of aluminum.

[0079] When the negative terminal 104 of the single battery 100 is changed from copper to aluminum, the first end busbar 301 can also be formed integrally with aluminum to form the first joint 301a and the second joint 301b.

[0080] Busbar 302, etc. Figure 2 As shown, adjacent single cells 100 and another single cell 100 along the stacking direction X are electrically connected. Busbar 302 as follows Figure 2 As shown, the positive terminal 103 of one adjacent cell 100 along the stacking direction X is connected to the negative terminal 104 of the other adjacent cell 100 along the stacking direction X. Busbar 302 is as follows... Figure 5 As shown, it includes a plate-shaped first joint 302a, a plate-shaped second joint 302b, and a curved connecting portion 302c. The first joint 302a engages with the negative terminal 104 of an adjacent single cell 100. The second joint 302b engages with the positive terminal 103 of an adjacent single cell 100. The connecting portion 302c connects the first joint 302a and the second joint 302b. The busbar 302 is formed, for example, from a cladding material obtained by bonding copper and aluminum, copper, or aluminum.

[0081] When the busbar 302 is formed of a cladding material, for example, the first joint 302a is formed of copper and the second joint 302b is formed of aluminum. When the negative terminal 104 of the single cell 100 is a structure in which copper is changed to aluminum, the busbar 302 may also be a structure in which the first joint 302a, the second joint 302b and the connecting portion 302c are integrally formed of aluminum.

[0082] Second end busbar 303 as shown Figure 2 As shown, the negative terminal 104 of the single cell 100 closest to the second end module 212 is engaged with one of the 20 stacked single cells 100.

[0083] Second end busbar 303 as shown Figure 5 As shown, it includes a plate-shaped first joint 303a, a plate-shaped second joint 303b, a curved connecting portion 303c, and an insertion hole 303d. The first joint 303a is engaged with the negative terminal 104 of the single battery 100. The second joint 303b is engaged with a busbar that is connected to an external control device.

[0084] Connector 303c connects first joint 303a to second joint 303b. Insertion hole 303d is formed on second joint 303b. Fastening bolt is inserted into insertion hole 303d. Second joint 303b and busbar communicating with external control equipment are joined by fastening bolt. Second end busbar 303 is, for example, made of copper.

[0085] Busbar bracket 311 Figure 1 As shown, a first end busbar 301, multiple busbars 302, and a second end busbar 303 are integrally held together. Additionally, a busbar support 311 covers and insulates the stacked multiple individual cells 100. The busbar support 311 is as follows... Figure 5 As shown, it is formed into a plate shape.

[0086] Multiple openings 311a are formed on the busbar support 311. Each opening 311a exposes the first or second joint of the first end busbar 301, the multiple busbars 302, and the second end busbar 303 toward the single battery 100. Each opening 311a is larger than the first or second joint of the corresponding busbar.

[0087] Multiple retaining portions 311b are formed on the busbar support 311. Each retaining portion 311b retains the end of the first joint or the second joint of the first end busbar 301, the multiple busbars 302, and the second end busbar 303. Each retaining portion 311b is formed at the edge of the opening 311a.

[0088] Each retaining portion 311b has a straight groove along the surface of the busbar support 311. The end of the first or second joint of the corresponding busbar is inserted into the groove of each retaining portion 311b. Multiple insertion portions 311c are formed on the busbar support 311. The wire 502 of the temperature measuring unit 500 is inserted into the insertion portions 311c.

[0089] Structure of Voltage Detection Unit 400

[0090] Figure 1 , Figure 2 and Figure 5 The voltage detection unit 400 shown detects the voltage of the single battery 100, for example, based on control from an external control machine. The voltage detection unit 400, as... Figure 5As shown, the voltage detection unit 400 includes a voltage detection terminal 401 and a wire 402. The structure included in the voltage detection unit 400 will be described below.

[0091] Voltage detection terminal 401, for example Figure 5 The device is conductive and is formed in a plate shape. The voltage detection terminal 401 is connected to the first end busbar 301, multiple busbars 302 and the second end busbar 303 of the busbar unit 300, respectively.

[0092] 402 wire Figure 5 As shown, it is connected to voltage detection terminal 401. Wire 402 connects voltage detection terminal 401 to an external control device.

[0093] Structure of Temperature Measuring Unit 500

[0094] Figure 1 , Figure 2 and Figure 5 The temperature measuring unit 500 shown measures the temperature of the single battery 100, for example, under the control of an external control machine. The temperature measuring unit 500, as shown... Figure 2 As shown, the temperature measuring unit 500 includes a temperature sensor 501 and a wire 502. The structure included in the temperature measuring unit 500 will be described below.

[0095] Temperature sensor 501 measures the temperature of single cell 100. Temperature sensor 501, as... Figure 2 As shown, for example, it engages with the cover 102 of the seventh and fourteenth single cells 100 as they move from the first end module 211 toward the second end module 212.

[0096] 502 wire Figure 2 As shown, it is installed on temperature sensor 501. Wire 502 connects temperature sensor 501 to an external control device.

[0097] return Figure 1 The battery pack 1 includes an exhaust unit 600 that moves the gas discharged from the single cell 100. This will be briefly described below.

[0098] Structure of Exhaust Unit 600

[0099] The venting unit 600 allows the gas discharged from the safety valve 105 of the single cell 100 to be discharged to the outside of the battery pack 1. The venting unit 600, as... Figure 1 As shown, it includes a gas passage cover 601 and a fastening bolt 602. The structure included in the exhaust unit 600 will be described below.

[0100] Gas passage cover 601 Figure 1As shown, it includes an exhaust passage 601a, an exhaust pipe 601b, and a fixing part 601c. The exhaust passage 601a is formed inside the gas passage cover 601 and extends along the lamination direction X. The exhaust passage 601a is formed in a cuboid shape and has an internal space for gas flow along its long side. In addition, the gas passage cover 601 is integrally formed of synthetic resin, or it can be integrally formed with a reinforcing metal frame material.

[0101] Furthermore, the exhaust pipe 601b is fluidly connected to the exhaust passage 601a and has the function of discharging the gas flowing through the exhaust passage 601a. ​​The exhaust pipe 601b and the gas passage cover 601 are integrally formed by injection molding of synthetic resin. Alternatively, the exhaust pipe 601b and the gas passage cover 601 can also be integrally formed by adhesive or friction welding after being formed separately.

[0102] The exhaust passage 601a faces the safety valves 105 of the stacked 20 individual batteries 100 across the internal space. The exhaust passage 601a covers the safety valves 105 of the stacked 20 individual batteries 100 and moves the gas discharged from the safety valves 105 toward the exhaust pipe 601b.

[0103] Exhaust pipe 601b, for example Figure 1 As shown, the exhaust passage 601a is open at one end along its long side. The exhaust pipe 601b is formed in a cylindrical shape. The exhaust pipe 601b allows the gas accumulated in the exhaust passage 601a to be discharged to the outside. The exhaust pipe 601b is configured as an exhaust hose connected to the discharged gas.

[0104] Fixing part 601c Figure 7 As shown, it is formed at both ends of the long side of the exhaust passage 601a. ​​A pair of fixing parts 601c are formed in the shape of plates. Holes for inserting fastening bolts 602 are formed on the pair of fixing parts 601c.

[0105] Fastening bolt 602 Figure 1 As shown, the gas passage cover 601 is fixed to the first end module 251 via the fixing part 601c. Similarly, the fastening bolt 602 is fixed to the second end module 252 via the fixing part 601c.

[0106] like Figure 2As shown, the gas passage cover 601, indicated by the dashed line, is positioned near the center of the safety valve 105 in a direction orthogonal to the long side direction (the stacking direction of the individual cells) of the battery pack 1. Thus, an exhaust pipe 601b formed on the gas passage cover 601 exists above the safety valve 105. Furthermore, the exhaust pipe 601b is formed near the individual cell 100 on one end side of the battery pack 1, but is not limited to this and can be located at any position of the individual cell 100. However, the exhaust passage 601a needs to be positioned along the column of safety valves 105 of each individual cell 100.

[0107] Structure of Busbar Unit 300

[0108] The manifold unit 300 includes a first end manifold 301, a plurality of manifolds 302, a second end manifold 303, and a manifold support 311. To avoid interference with the gas passage cover 601, the manifold support 311 is configured to have a section removed along the stacking direction X. Figure 5 The central portion of the busbar bracket 311 shown. That is, the busbar bracket 311 is partially configured as a pair at both ends in the width direction Y. However, it is also possible to join the pair of busbar brackets 311 together to form a single plate-shaped busbar bracket.

[0109] use Figure 6 This section briefly explains the phenomenon of a dented exhaust pipe and damaged safety valve in a battery pack with this structure. Additionally, Figure 6 Since there have been some changes compared to the above structure, new reference numbers are attached below for explanation.

[0110] Figure 6 This is a view taken from an oblique upward angle, showing a longitudinal section cut off the area near the gas passage cover 11 in the battery pack 10 towards the bottom surface of the single cell 12. Additionally, the safety valve 105 (see reference...) Figure 2 The position relative to the cross-section is in front, therefore Figure 6 It is not described in the text.

[0111] The single cells 12 are stacked along the long side direction (arrow Ld direction) of the gas passage cover 11. A busbar support 13 is disposed between the single cells 12 and the gas passage cover 11. Here, the busbar support 13 extends to the vicinity of the exhaust pipe 14. In addition, a busbar support cover 17 is disposed on the upper surface of the busbar support 13. The busbar support cover 17 is provided on both sides of the gas passage cover 11. This part of the structure is similar to... Figure 1 The difference.

[0112] Additionally, a safety valve is installed in single battery 12, but... Figure 6 The middle section is not depicted due to its cross-sectional shape; in fact, as shown in the image... Figure 2As shown, the safety valve is formed directly below the exhaust pipe 14. The exhaust pipe 14 and the gas passage cover 11 are integrally injection molded from synthetic resin. Then, the safety valve 105 of a single battery 12 (see reference) Figure 2 When the gas is ruptured and discharged, the gas flows through the space of the exhaust passage 15 of the gas passage cover 11 and is discharged from the exhaust pipe 14.

[0113] In a battery pack 10 with such a structure, if the battery pack is accidentally dropped, the exhaust pipe 14 may fall downwards. Then, the exhaust pipe 14 collides with the workbench or the ground. When the exhaust pipe 14 is subjected to external force, the connection part 16 between the exhaust pipe 14 and the gas passage cover 11 breaks, and the exhaust pipe 14 is dented inwards towards the inside of the gas passage cover 11 (on the side of the single battery 12).

[0114] When connection 16 breaks, exhaust pipe 14 dents and moves toward single cell 12 as indicated by arrow Aw. Therefore, the inner front end 14E of exhaust pipe 14 and safety valve 105 (see reference)... Figure 2 The phenomenon of collision occurs. Thus, when the exhaust pipe 14 dents inward towards the gas passage cover 11, it results in damage to the safety valve 105 (see reference). Figure 2 (Technical issues)

[0115] To address this technical problem, the present invention proposes a battery pack having an exhaust unit with the structure shown below. Several embodiments of the present invention will now be described with reference to the accompanying drawings.

[0116] Example 1

[0117] In a first embodiment of the present invention, a vulnerable portion is formed at a portion of the exhaust pipe 14 protruding outward from the gas passage cover 11, serving as an anti-denting function. This vulnerable portion has less strength or rigidity than the connecting portion, allowing the exhaust pipe 14 to detach from the gas passage cover 11 before the connecting portion breaks. This prevents the exhaust pipe from denting.

[0118] Figure 7 A first embodiment of the present invention is shown. The exhaust pipe 14 and the gas passage cover 11 are integrally formed of synthetic resin. In the exhaust pipe 14, a cylindrical portion 14B extends vertically outward (opposite to the single cell 12) from the front side surface 11S of the gas passage cover 11. The cylindrical portion 14B refers to the portion from the front side surface 11S of the gas passage cover 11 to the outer front end portion 14P.

[0119] Furthermore, a large-diameter portion 14L is formed near the outer front end 14P of the cylindrical portion 14B of the exhaust pipe 14. This large-diameter portion 14L has the function of preventing dislodgement when the exhaust hose is inserted from the outside. Furthermore, it also has the function of preventing denting as described in the fourth embodiment later (this will be described later).

[0120] In addition, the thickness (L1) of the gas passage cover 11 and the thickness (L2) of the cylindrical portion 14B of the exhaust pipe 14 are formed to have substantially the same thickness. Therefore, the connecting portion 16 that connects the gas passage cover 11 and the exhaust pipe 14 also has substantially the same thickness as these two thicknesses.

[0121] On the other hand, on the root side of the cylindrical portion 14B of the exhaust pipe 14 connected to the front side surface 11S of the gas passage cover 11, there is provided a fragile portion 18A which is a feature of the present embodiment and serves as an anti-dimple function portion (dimple suppression function portion). The fragile portion 18A may be formed at any position of the cylindrical portion 14B, and in the present embodiment, it is formed directly above the front side surface 11S of the gas passage cover 11. The fragile portion 18A is constituted by an annular groove (annular slot) formed by cutting the outer periphery of the exhaust pipe 14 into a predetermined shape. Hereinafter, the reference numeral "18A" is assigned to the annular groove. Here, although the annular groove is described as a continuous groove, for example, grooves formed at intervals also fall within the scope of the annular groove.

[0122] In addition, the annular groove 18A is formed in a groove shape extending from the outer peripheral surface of the exhaust pipe 14 to the inner peripheral surface thereof, and the annular groove 18A is formed to be substantially parallel to the front side surface 11S of the gas passage cover 11 or along the shape of the front side surface 11S.

[0123] In the present embodiment, the shape of the groove is formed as a triangle tapering toward the inner peripheral side. Therefore, the thickness (L3) of the cylindrical portion 14B of the exhaust pipe 14 at the portion where the annular groove 18A is formed is thinner than the thickness (L2) of the cylindrical portion 14B of the exhaust pipe 14 at portions other than the portion where the annular groove 18A is formed and the thickness (L1) of the gas passage cover 11. That is, the relationship "L3 < L1 ≈ L2" is satisfied. The annular groove 18A can also be referred to as a diameter reducing portion.

[0124] Thus, since the portion of the annular groove 18A is thinner than other portions of the cylindrical portion 14B of the exhaust pipe 14, its mechanical strength or rigidity is lower; furthermore, due to the notch shape, stress is easily concentrated in this structure.

[0125] Next, the functions and effects of providing the fragile portion 18A with such a shape will be described. Assuming that the battery pack 10 is accidentally dropped, it will land with the exhaust pipe 14 facing downward. Then, the exhaust pipe 14 collides with the workbench or the ground, resulting in a state where an external force is applied to the exhaust pipe 14.

[0126] In this state, the external force applied to the exhaust pipe 14 mainly acts on the exhaust pipe 14 and the connecting portion 16. Since the thickness (L3) of the annular groove constituting the fragile portion 18A is relatively thin and stress is concentrated here, when an external force is received, the fragile portion 18A of the exhaust pipe 14 bends relative to the connecting portion 16 and breaks first.

[0127] Therefore, the broken exhaust pipe 14 will scatter outwards from the battery pack 10 and will not dent inwards from the gas passage cover 11, thus preventing the safety valve 105 (see reference) from collapsing. Figure 2 )damage.

[0128] Thus, according to this embodiment, even if the exhaust pipe 14 collides with the workbench or the ground and is subjected to external force, it is possible to prevent the exhaust pipe 14 from denting into the inside of the gas passage cover 11 and damaging the safety valve 105 (see reference). Figure 2 The phenomenon of ).

[0129] Here, the annular groove constituting the vulnerable part 18A is triangular in shape, but it can also be rectangular or arc-shaped. These shapes can also reduce the thickness of the portion forming the annular groove 18A and concentrate stress more effectively through the slit effect.

[0130] Furthermore, the annular groove 18A is formed parallel to the front side surface 11S of the gas passage cover 11, but it can also be formed as a vulnerable part 18B inclined relative to the front side surface 11S. With this shape, as mentioned above, because the thickness (L3) of the annular groove forming the vulnerable part 18B is thinner and stress is concentrated, the vulnerable part 18B of the exhaust pipe 14 breaks before the connecting portion 16 when subjected to external force. Therefore, the broken exhaust pipe 14 will not dent into the interior side of the gas passage cover 11, thus preventing the safety valve 105 (see reference...) from... Figure 2 )damage.

[0131] In this way, even if the vent pipe 14 of the gas passage cover 11 breaks, the safety valve of the single battery 12 will not be damaged, so the single battery 12 can continue to be used. Therefore, in this case, a new battery pack 10 can be manufactured simply by replacing the gas passage cover 11 with a new one.

[0132] Example 2

[0133] Next, according to Figures 8-11 The second embodiment of the present invention will be described. In the second embodiment, the characteristic is that the root side of the cylinder portion 14B of the exhaust pipe 14, which protrudes outward in the vertical direction from the gas passage cover 11, is of a predetermined thickness (a thicker region), and the front end side is of a thinner thickness (a thinner region) than the root side, and the boundary between the thicker region and the thinner region is formed to be inclined relative to the axis of the exhaust pipe 14.

[0134] Figures 8-9 The appearance of the exhaust pipe 14 in this embodiment is shown. Figures 10-11 It shows Figures 8-9 The longitudinal section.

[0135] Figures 8-9In the present invention, the exhaust pipe 14 is formed with a cylindrical portion 14B standing upright in the vertical direction from the front side surface 11S of the gas passage cover 11. A thick-walled portion 19 having a predetermined length is formed from the root side of the cylindrical portion 14B (near the connecting portion 16). The thickness of the thick-walled portion 19 is as Figure 11 shown, which is a thickness (L2) substantially the same as the thickness (L1) of the gas passage cover 11.

[0136] On the other hand, a thin-walled portion 20 is formed from the thick-walled portion 19 of the exhaust pipe 14 to the outer front end 14P, and the thickness of the thin-walled portion 20 is as Figure 11 shown, which is a thickness (L3) formed to be thinner than that of the thick-walled portion 19. That is, the relationship "L3 < L1 ≈ L2" is satisfied. Accordingly, a height difference 21 is formed at the boundary between the thick-walled portion 19 and the thin-walled portion 20. In this embodiment, the height difference 21 functions as a fragile portion. Hereinafter, the height difference 21 may also be referred to as the fragile portion 21.

[0137] In addition, as Figure 9 shown, in a side view when viewed from the side with respect to the axis (C) of the exhaust pipe 14, the boundary line (the line of the height difference) between the thick-walled portion 19 and the thin-walled portion 20 is inclined to form a predetermined inclination angle (θ1) with respect to the axis (C). Here, the inclination angle (θ1) is an inclination angle relative to the front side surface 11S of the gas passage cover 11.

[0138] As described above, similarly to the first embodiment, by forming the height difference 21 between the thick-walled portion 19 and the thin-walled portion 20 as an anti-depression functional portion in an inclined manner, when an external force is applied, the exhaust pipe 14 is fractured while falling in a direction along the front side surface 11S. Accordingly, the fractured exhaust pipe 14 does not enter the inner side of the gas passage cover 11, and damage to the safety valve of the single cell 12 can be avoided.

[0139] Here, the inclination angle (θ1) of the height difference 21 between the thick-walled portion 19 and the thin-walled portion 20 is an arbitrary angle, and is set in a range of 10° to 15° in this embodiment.

[0140] Next, the functions and effects of providing the fragile portion 21 having such a shape will be described. It is assumed that the battery pack 10 is accidentally dropped, and the exhaust pipe 14 falls downward. Then, the exhaust pipe 14 collides with a workbench or the ground, resulting in a state where an external force is applied to the exhaust pipe 14.

[0141] In this state, the external force applied to the exhaust pipe 14 is mainly located at the exhaust pipe 14 and the connecting part 16. Because the thickness (L3) of the thin-walled part 20 that constitutes the weak part 21 is relatively thin, and the connection between the thick-walled part 19 of the height difference part (step part) 21 and the boundary of the thin-walled part 20 is close to a right angle, it is a shape that is easy to produce a cutting effect, and the stress is concentrated. Therefore, when subjected to external force, the weak part 21 of the exhaust pipe 14 breaks first relative to the connecting part 16.

[0142] Furthermore, the height difference 21 at the boundary between the thick-walled portion 19 and the thin-walled portion 20 is formed to be inclined relative to the axis (C). As a result, when subjected to external force, the exhaust pipe 14 tilts and breaks in the direction along the front side surface 11S. Thus, the broken exhaust pipe 14 will not enter the inside of the gas passage cover 11, thereby preventing damage to the safety valve of the single battery 12.

[0143] Thus, in this embodiment, even if the exhaust pipe 14 collides with the workbench or the ground and is subjected to external force, it can prevent the exhaust pipe 14 from denting into the inside of the gas passage cover 11 and damaging the safety valve 105 (see reference). Figure 2 The phenomenon of ).

[0144] Here, even if the vent pipe 14 of the gas passage cover 11 is damaged, the safety valve of the single battery 12 will not be damaged, so the single battery 12 can continue to be used. Therefore, in this case, a new battery pack 10 can be made simply by replacing the gas passage cover 11 with a new one.

[0145] In addition, such as Figure 11 As shown by the dashed line, it is also possible to form, on the upper side of the boundary between the thick-walled portion 19 and the thin-walled portion 20, a shape like... Figure 7 The annular groove 22 is shown. If this annular groove 22 is provided, the exhaust pipe 14 can be broken more easily.

[0146] Variations

[0147] in addition, Figure 12 It shows Figures 8-11 A variation of the embodiment. In this variation, the root side of the cylinder portion 14B of the exhaust pipe 14 protruding outward from the gas passage cover 11 is formed with a thick wall portion 19 of a predetermined thickness, and the front end side is formed with a thin wall portion 20 that is thinner than the root side. The boundary between the thick wall portion 19 and the thin wall portion 20 is designated as a weak portion 21A, and the weak portion 21A is formed parallel to the front side surface 11S of the gas passage cover 11.

[0148] Figure 12 In the middle, the exhaust pipe 14 rises vertically from the gas passage cover 11 and forms a thick-walled portion 19 of a predetermined length starting from one side of the root (near the connecting portion 16). The thickness of the thick-walled portion 19 is (L2), which is approximately the same as the thickness (L1) of the gas passage cover 11.

[0149] On the other hand, a thin-walled portion 20 is formed from the thick-walled portion 19 of the exhaust pipe 14 to the outer front end portion 14P. The thickness of the thin-walled portion 20 is (L3), which is thinner than that of the thick-walled portion 19. Thus, the boundary between the thick-walled portion 19 and the thin-walled portion 20 is a weak point 21A. In addition, because the connection portion of this boundary is close to a right angle, it is a shape that is prone to producing a cutting effect (stress concentration). In this case, as in the first embodiment, by making the boundary between the thick-walled portion 19 and the thin-walled portion 20 a weak point 21A, the anti-dent function is achieved.

[0150] Furthermore, in this modified example, a structure such as […] can also be formed on the upper side of the boundary between the thick-walled portion 19 and the thin-walled portion 20. Figure 7 The annular groove shown. If this annular groove is provided, the exhaust pipe 14 can be broken more easily.

[0151] Thus, because the thin-walled portion 20 forming the vulnerable part 21A is thin and stress is concentrated, the vulnerable part 21A of the exhaust pipe 14 will break before the connecting portion 16 when subjected to external force. Therefore, the broken exhaust pipe 14 will not dent towards the inside of the gas passage cover 11, thus preventing the safety valve 105 (see reference) from collapsing. Figure 2 )damage.

[0152] Example 3

[0153] Next, according to Figures 13-14 The third embodiment of the present invention will be described. In the third embodiment, the front end of the outer front portion 14P of the exhaust pipe 14, which protrudes outward in the vertical direction from the gas passage cover 11, is formed to be inclined relative to the axis of the exhaust pipe 14.

[0154] Figure 13 The appearance of the side of the exhaust pipe 14 in this embodiment is shown. Figure 14 It shows Figure 13 The longitudinal section.

[0155] Figures 13-14 In the middle, the exhaust pipe 14 rises vertically from the front side surface 11S of the gas passage cover 11, forming a straight tube-shaped cylindrical portion 14B with a predetermined length starting from the root side (near the connecting portion 16). A large-diameter portion 14L with the function of preventing dislodgement when the exhaust hose is inserted from the outside is formed in the middle of the cylindrical portion 14B.

[0156] Furthermore, in this embodiment, an inclined surface 14i that slopes upward is formed on the outer front end portion 14P. This inclined surface 14i is inclined at a predetermined angle (θ2) relative to the axis (C) of the exhaust pipe 14. In this embodiment, the inclined surface 14i functions as an anti-denting part.

[0157] The inclined face 14i has a front end portion 14T located at the position furthest from the frontal side plane (surface side plane) 11S. Thus, when the exhaust pipe 14 falls downwards and collides with the workbench or the ground, the inclined face 14i with the front end portion 14T bears the lateral force during the collision.

[0158] Therefore, the exhaust pipe 14 will not dent towards the single battery 12 side, but will instead tilt and break. This prevents the exhaust pipe 14 from denting towards the inside of the gas passage cover 11 and damaging the safety valve 105 (see reference). Figure 2 This phenomenon is described in this embodiment as a continuous tilt of the tilted surface, but it is not limited to this and can also be changed to a stepped tilt of varying heights.

[0159] Here, even if the vent pipe 14 of the gas passage cover 11 is damaged, the safety valve of the single battery 12 will not be damaged, so the single battery 12 can continue to be used. Therefore, in this case, a new battery pack 10 can be made simply by replacing the gas passage cover 11 with a new one.

[0160] Example 4

[0161] Next, according to Figure 15 The fourth embodiment of the present invention will be described. In the fourth embodiment, the feature is that when an external force is applied to the exhaust pipe 14, even if the exhaust pipe 14 is recessed into the gas passage cover 11, the inner front end portion 14E of the exhaust pipe 14 will not reach the length of the safety valve 105.

[0162] Figure 15 In the exhaust pipe 14, the outer diameter (D1) of the recessed region 14C between the large-diameter portion 14L and the front side plane 11S in the cylindrical portion 14B is shorter than the outer diameter (D2) of the large-diameter portion 14L. Therefore, when the connecting portion 16 of the exhaust pipe 14 breaks and the exhaust pipe 14 is recessed, the large-diameter portion 14L engages with the recessed hole in the front side plane 11S, preventing the exhaust pipe 14 from being recessed.

[0163] On the other hand, the axial length of the recessed region 14C is set as the recessed region length (L4). This recessed region length (L4) is the length of the surface from the rear side plane 11R of the gas passage cover 11 to the front side plane 11S of the large diameter portion 14L. Furthermore, the length from the inner front end 14E to the outer front end 14P of the exhaust pipe 14 is the exhaust pipe length (L5).

[0164] In addition, the length from the front side plane 11S of the gas passage cover 11 to the surface of the safety valve 105 of the single cell 12 is set as a gap length (L6). Here, the relationship among the recessed area length (L4), the discharge pipe length (L5) and the gap length (L6) is set as "L4<L5<L6".

[0165] Next, the functions and effects of providing the weakened portion 18A having such a shape will be described. Assuming that the battery pack 10 is accidentally dropped, it falls with the exhaust pipe 14 positioned downward. Then, the exhaust pipe 14 collides with a workbench or the ground, resulting in a state where an external force is applied to the exhaust pipe 14.

[0166] In this state, the external force applied to the exhaust pipe 14 is mainly applied to the exhaust pipe 14 and the connecting portion 16. When the external force is received, the connecting portion 16 of the exhaust pipe 14 breaks. Then, the broken exhaust pipe 14 is recessed toward the single cell 12 side. However, since the outer diameter (D2) of the large-diameter portion 14L of the exhaust pipe 14 is larger than the outer diameter (D1) of the recessed area of the exhaust pipe 14, the large-diameter portion 14L of the exhaust pipe 14 engages with the recessed hole in the front side plane 11S of the gas passage cover 11, stopping the recessing of the exhaust pipe 14 (anti-recess function).

[0167] At this time, since the length (L4) of the recessed area of the exhaust pipe 14 is shorter than the gap length (L6) between the gas passage cover 11 and the safety valve 105 of the single cell 12, the inner front end portion 14E of the exhaust pipe 14 does not reach the safety valve 105. Therefore, even if the broken exhaust pipe 14 is recessed toward the inner side of the gas passage cover 11, it will not reach the safety valve 105, so damage to the safety valve 105 can be suppressed.

[0168] On the other hand, it is also conceivable that the large-diameter portion 14L of the exhaust pipe 14 breaks through the recessed hole in the front side plane 11S of the gas passage cover 11, causing the exhaust pipe 14 to be recessed into the gas passage cover 11.

[0169] In this case, since the discharge pipe length (L5) of the exhaust pipe 14 is shorter than the gap length (L6) between the gas passage cover 11 and the safety valve 105 of the single cell 12, the inner front end portion 14E of the exhaust pipe 14 does not reach the safety valve 105. Therefore, even if the entire broken exhaust pipe 14 is recessed toward the inner side of the gas passage cover 11, it will not reach the safety valve 105, so damage to the safety valve 105 can be avoided.

[0170] Here, even if the exhaust pipe 14 of the gas passage cover 11 is damaged, the safety valve of the single cell 12 will not be damaged, so the single cell 12 can continue to be used. Therefore, in this case, a new battery pack 10 can be manufactured only by replacing the gas passage cover 11 with a new one.

[0171] In the above embodiments, the following structures can be additionally adopted. For example, a structure can be adopted in which the manifold support 13 extends beyond the vent pipe 14 to the side of the safety valve 105. In addition, in this case, an vent hole needs to be provided at the location of the safety valve 105 in the extended portion.

[0172] By adding such a structure, even if the broken exhaust pipe 14 is recessed into the inside of the gas passage cover 11, the manifold bracket 13 can prevent the exhaust pipe 14 from being recessed, thus avoiding damage to the safety valve 105.

[0173] As described above, the present invention is a battery pack consisting of multiple stacked single cells with safety valves, characterized in that it includes: a gas passage cover made of synthetic resin, which is disposed opposite to the safety valves to form an exhaust passage through which gas discharged from the safety valves of the multiple single cells flows; and an exhaust pipe integrally formed with the gas passage cover, extending in a direction away from the single cells to discharge the gas from the exhaust passage to the outside; the exhaust pipe has a structure that does not indent into the inside of the gas passage cover when subjected to external force.

[0174] Furthermore, the present invention is a battery pack consisting of multiple stacked single cells with safety valves, characterized in that it includes: a gas passage cover made of synthetic resin, which is disposed opposite to the safety valves and forms an exhaust passage through which gas discharged from the safety valves of the multiple single cells flows; and an exhaust pipe integrally formed with the gas passage cover, extending in a direction away from the single cells, to discharge the gas from the exhaust passage to the outside; the exhaust pipe is configured such that even if it is recessed inward towards the gas passage cover when subjected to external force, it will not reach the length of the safety valves.

[0175] Therefore, even if the exhaust pipe collides with the workbench or the ground and is subjected to external force, it can prevent the exhaust pipe from denting into the inside of the gas passage cover and damaging the safety valve.

[0176] Furthermore, the present invention is not limited to the above-described embodiments, but includes various modifications. The above embodiments are described in detail for ease of understanding of the present invention and are not limited to having all the structures described. In addition, a part of the structure of a certain embodiment may be replaced with the structure of another embodiment, or the structure of another embodiment may be added to the structure of a certain embodiment. For a part of the structure of each embodiment, other structures may be added, deleted, or replaced.

[0177] Explanation of reference numerals in the attached figures

[0178] 1…Battery pack, 100…Single cell, 101…Container, 102…Cap, 103…Positive terminal, 104…Negative terminal, 105…Safety valve, 200…Retaining unit, 201…First end spacer, 203…Second end spacer, 211…First end module, 212…Second end module, 231…First side plate, 232…Second side plate, 300…Busbar unit, 311…Busbar bracket, 400…Voltage detection unit, 500…Temperature measurement unit, 600…Exhaust unit, 601…Gas conduit, 601a…Gas movement path, 601b…Exhaust pipe.

Claims

1. A battery pack consisting of multiple stacked single cells with a safety valve, characterized in that, include: A gas passage cover, which is configured opposite to the safety valve, forms an exhaust passage through which gas discharged from the safety valves of the plurality of individual cells flows. and An exhaust pipe, which is disposed on the gas passage cover and extends in a direction away from the single battery, discharges the gas in the exhaust passage to the outside; The exhaust pipe has an anti-denting function that prevents it from denting inwards towards the inside of the gas passage cover when subjected to external force.

2. The battery pack as described in claim 1, characterized in that: The dent-resistant functional part is a vulnerable part formed at a portion of the cylindrical part that forms the exhaust pipe.

3. The battery pack as described in claim 2, characterized in that: The vulnerable part is an annular groove formed on the outer periphery of the cylindrical part.

4. The battery pack as described in claim 3, characterized in that: The annular groove is a groove formed on the outer periphery of the cylinder with a triangular, rectangular, or arc-shaped cross-section.

5. The battery pack as described in claim 2, characterized in that: The vulnerable part is an annular height difference formed between a thick-walled part formed on one side of the gas passage cover formed on the cylinder and a thin-walled part formed between the thick-walled part and the front end of the cylinder.

6. The battery pack as described in claim 5, characterized in that: The annular height difference portion is formed in a side view of the cylindrical portion as if it were inclined relative to the axis of the exhaust pipe.

7. The battery pack as described in claim 5, characterized in that: The annular height difference is formed in the side view of the cylinder in the direction along the front side plane of the gas passage cover.

8. The battery pack as described in claim 1, characterized in that: The anti-dent function is an inclined surface or height difference portion formed at the front end of the cylindrical portion forming the exhaust pipe, which is inclined relative to the axis of the exhaust pipe in the side view of the cylindrical portion.

9. A battery pack consisting of multiple stacked single cells with a safety valve, characterized in that, include: A gas passage cover made of synthetic resin is disposed opposite to the safety valve, forming an exhaust passage through which gas discharged from the safety valves of the plurality of individual cells flows. and An exhaust pipe, which is disposed on the gas passage cover and extends in a direction away from the single battery, discharges the gas in the exhaust passage to the outside; The exhaust pipe is configured so that it will not reach the length of the safety valve even if it is subjected to external force and caves inward toward the inside of the gas passage cover.

10. The battery pack as claimed in claim 9, characterized in that: The exhaust pipe length (L5) is set to be shorter than the gap length (L6) from the safety valve of the single cell to the gas passage cover.

11. The battery pack as claimed in claim 10, characterized in that: The exhaust pipe length (L5) of the exhaust pipe is the length from the inner front end to the outer front end of the exhaust pipe. The gap length (L6) is the length from the safety valve of the single cell to the front side plane of the gas passage cover.

12. The battery pack according to any one of claims 1 to 11, characterized in that: On one side of the gas passage cover of the safety valve, a manifold support for holding the manifold is provided; The manifold bracket extends at least beyond the exhaust pipe and has an exhaust port formed at the location of the safety valve.

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