Title of Invention: Pouch-type battery cell including venting member and battery pack including same
Technical field
[One]
This application claims the benefit of priority based on Korean Patent Application No. 2018-0157169 filed on December 7, 2018, and all contents disclosed in the documents of the Korean patent application are included as part of this specification.
[2]
The present invention relates to a pouch-type battery cell including a venting member and a battery pack including the same, and specifically, shape memory on the outer surface of the pouch-type battery cell or the inner surface of the battery pack case including the pouch-type battery cell. A pouch-type battery cell capable of inducing venting of the battery cell by adding a venting member made of an alloy material, and a battery pack including the same.
Background
[3]
As an energy source capable of repetitive charging and discharging of portable electronic products such as mobile phones, tablet PCs and vacuum cleaners, the demand for secondary batteries is rapidly increasing, and is applied to devices that require high capacity and high efficiency, such as electric vehicles and power storage devices. The development and research of secondary batteries are in progress.
[4]
In particular, among secondary batteries, lithium secondary batteries having advantages such as high energy density, high voltage, high power, and excellent life characteristics are widely used.
[5]
The lithium secondary battery can be classified according to the shape of the case, for example, there is a cylindrical battery in which an electrode assembly is mounted on a metal can or a prismatic battery, and the electrode assembly is mounted on a pouch-shaped case of an aluminum laminate sheet. There is one type of pouch type battery. Since the pouch-type battery can be easily bent or bent, it is advantageous in that its shape is free to change.
[6]
In general, a lithium secondary battery includes an electrode active material constituting an electrode, a binder, and an electrolyte as major components, and these are electrochemically stable at an operating voltage in the range of 2.5V to 4.3V. However, when the voltage of the lithium secondary battery rises above the operating voltage, the components are decomposed to generate gas, and the lithium secondary battery expands and deforms due to the generated gas. In addition, when the separator is damaged by the inorganic material contained in the electrode mixture and the contact between the anode and the cathode occurs, a large amount of current flows to promote the generation of heat and gas, which may cause ignition and explosion of the secondary battery.
[7]
In order to remove the gas generated inside the battery, cylindrical and prismatic batteries have safety devices such as vents in the cap assembly, while pouch-type batteries only determine venting by sealing strength without a separate safety device. However, it is difficult to induce venting under desired conditions.
[8]
In this regard, Patent Document 1 discloses a secondary battery in which an opening communicating with the inside is formed in a battery case, and a safety opening/closing part of a shape memory alloy capable of opening and closing the opening is added.
[9]
Patent Document 1 uses a structure for opening and closing the opening in a pouch case in a state in which the opening is formed, but since the safety opening and closing part is applied to the sealing part of the pouch battery, the structure in which the sealing part is bent cannot be applied. There is a problem that dead space occurs in the width direction.
[10]
Patent Document 2 relates to a secondary battery in which the pouch is opened while the bent shape memory alloy is opened when the temperature is increased.
[11]
However, Patent Document 2 is not preferable because the shape memory alloy is located inside the pouch battery, and the shape memory alloy has a problem in that side reactions such as an electrolyte occur.
[12]
In this way, in order to discharge the gas generated inside the pouch-type battery cell at a desired temperature, it is possible to set the discharge temperature of the gas, and there is a need for a technology that can prevent ignition and explosion due to an increase in the internal pressure of the secondary battery. It is a high situation.
[13]
(Prior technical literature)
[14]
Korean Registered Patent Publication No.0886570
[15]
Korean Patent Application Publication No. 2013-0019477
Detailed description of the invention
Technical challenge
[16]
The present invention provides a pouch-type battery cell capable of discharging gas inside the battery cell at a desired temperature by applying a venting member made of a shape memory alloy to the outer surface of the pouch-type battery cell as to solve the above problems. It aims to do.
Means of solving the task
[17]
The pouch-type battery cell according to the present invention for achieving this purpose includes a battery case including a metal layer and a polymer resin layer, and the battery case is formed with an electrode assembly storage unit in at least one of an upper case and a lower case. In addition, a venting member is positioned on an outer surface of the electrode assembly receiving part as an adjacent part of the sealing part of the battery case, and the venting member may be made of a shape memory alloy that is deformed to penetrate the battery case when the temperature of the battery cell increases. .
[18]
The venting member may have a straight shape at a normal temperature, and at least one end thereof may be bent when the temperature increases.
[19]
The venting member may have a pointed end of the portion to be deformed.
[20]
The battery case is a structure in which an electrode assembly storage unit is formed in an upper case and a lower case, the electrode assembly is a unidirectional electrode assembly in which an electrode terminal is formed in one direction, and the venting member is a portion adjacent to a sealing unit in which the electrode terminal is located. As the electrode assembly may be located on the outer surface of the housing.
[21]
The battery case has a structure in which an electrode assembly receiving part is formed in an upper case and a lower case, the electrode assembly is a bidirectional electrode assembly in which electrode terminals are formed in both directions, and the venting member is a part adjacent to the sealing part where the electrode terminal is located Alternatively, as a portion adjacent to the sealing portion where the electrode terminal is not located, it may be positioned on the outer surface of the electrode assembly receiving portion of at least one of the upper case and the lower case.
[22]
The venting member may be located on an outer surface of a side of the electrode assembly accommodating part in a direction in which the electrode terminal is not located.
[23]
The venting member may be positioned between the bent sealing part of the battery case and a side surface of the electrode assembly receiving part facing the bent sealing part.
[24]
The present invention also provides a battery module including a pouch-type battery cell, the pouch-type battery cell, a housing for accommodating one or more of the pouch-type battery cells, and internal gas of the pouch-type battery cell. And a venting member for discharging, and the venting member may have a shape attached to a position facing the sealing part of the pouch-type battery cell as an inner surface of the housing.
[25]
The venting member may have a structure attached to a position facing the sealing part in the direction in which the electrode terminal of the pouch-type battery cell is located.
[26]
The venting member may have a structure attached to a position facing the sealing part in a direction in which the electrode terminal of the pouch-type battery cell is not located.
[27]
The present invention also provides a battery pack for accommodating the pouch-type battery cell, or a battery module including the same, an end plate coupled to the electrode terminal of the pouch-type battery cell, or the pouch-type battery cell The cooling fin in contact may have a structure in which a venting member penetrating the battery case of the pouch-type battery cell is added because the shape is deformed by a temperature change.
Brief description of the drawing
[28]
1 is a perspective view of a venting member before and after deformation.
[29]
2 is a perspective view of a pouch-type battery cell including a unidirectional electrode assembly and having an electrode assembly receiving portion formed only in an upper case.
[30]
3 is a plan view of a pouch-type battery cell including a bidirectional electrode assembly.
[31]
4 is an exploded perspective view of a pouch-type battery cell including a unidirectional electrode assembly and in which an electrode assembly receiving portion is formed in an upper case and a lower case.
[32]
5 is a perspective view of a pouch-type battery cell including a bidirectional electrode assembly and having an electrode assembly receiving portion formed only in an upper case.
[33]
6 is a perspective view of a pouch-type battery cell in which the sealing portion is bent.
[34]
7 is an exploded view of a battery pack including a pouch-type battery cell and a venting member.
Mode for carrying out the invention
[35]
Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment in which one of ordinary skill in the art can easily implement the present invention. However, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[36]
In addition, the same reference numerals are used for parts having similar functions and functions throughout the drawings. Throughout the specification, when a part is said to be connected to another part, this includes not only a case in which it is directly connected, but also a case in which it is connected indirectly with another element interposed therebetween. In addition, the inclusion of a certain component does not exclude other components unless specifically stated to the contrary, but means that other components may be further included.
[37]
The pouch-type battery cell according to the present invention includes a battery case including a metal layer and a polymer resin layer, wherein the battery case has an electrode assembly receiving part formed in at least one of an upper case and a lower case, and sealing the battery case A venting member is positioned on an outer surface of the electrode assembly receiving part as a sub-adjacent part, and the venting member may be made of a shape memory alloy that is deformed to penetrate the battery case when the temperature of the battery cell increases.
[38]
The battery case has a structure including an external resin layer made of a material that is not affected by the external environment, a metal layer for preventing the inflow of gas and moisture, and an electrolyte leakage, and an internal resin layer for sealing the battery case. I can.
[39]
The electrode assembly is a jelly-roll type (winding type) electrode assembly in which long sheet-shaped anodes and cathodes are wound with a separator interposed therebetween, and a separator is formed between a plurality of anodes and cathodes cut in units of a predetermined size. Stacked (stacked) electrode assemblies sequentially stacked with an interposed state, Bi-cell stacked with a separator interposed between a predetermined unit of anode and cathode, and full cells are wound with a separator sheet It can be classified into a stack/folding type electrode assembly of one structure or a lamination/stack type of a structure in which the bi-cell and/or full cell are laminated and bonded with a separator interposed therebetween.
[40]
The electrode assembly may be composed of only one type of electrode assembly, or may be composed of two or more types of electrode assemblies having different shapes.
[41]
When composed of two or more types of electrode assemblies, considering that the electrode assemblies may have different sizes on a plane, the electrode assembly accommodating portion may have a stepped structure.
[42]
The venting member is made of a shape-memory alloy, and the shape-memory alloy is a metal alloy having a property of returning to the shape before deformation when it reaches the transition temperature or higher, even if it maintains a deformed state below the transition temperature. It may be made of an alloy or a copper-zinc-aluminum alloy.
[43]
The venting member has a straight shape at a normal temperature, and at least one end of the venting member is bent when the temperature is increased, and a through hole is formed in the battery case while the venting member is bent in the inner direction of the battery case to discharge gas.
[44]
Hereinafter, the normal temperature form of the venting member is referred to as a deformed form (state), and a state that returns to the pre-deformed form above the transition temperature is referred to as a restored form (state).
[45]
In order to easily form a through hole for gas discharge, the venting member may have a pointed end of a portion to be deformed and restored.
[46]
In this regard, FIG. 1 shows a perspective view before and after deformation of the venting member.
[47]
Referring to FIG. 1, the venting member 10 has a thin cylindrical shape as a whole, and is deformed in a linear shape at a normal temperature, but is restored to a shape before deformation when the temperature exceeds the transition temperature, so that the right end is bent.
[48]
The venting member 10 has a flat shape at its left end that is not bent above the transition temperature, while its right end that is bent at a temperature above the transition temperature has a pointed shape. Therefore, it is an advantageous form to form a through hole in the battery case.
[49]
The venting member 20 has a thin cylindrical shape as a whole, and is deformed in a linear shape at a normal temperature, but is restored to a shape before deformation when it reaches a transition temperature or higher, so that both ends are bent in the same direction.
[50]
The venting member 20 has a pointed left and right ends that bend when the transition temperature is higher.
[51]
The venting member 30 is generally in the shape of a thin and flat square pillar, and is deformed in a linear shape at a normal temperature, but is restored to a shape before deformation when the temperature exceeds the transition temperature, so that the right end is bent.
[52]
The venting member 30 has a flat shape at its left end that is not bent above the transition temperature, while its right end that is bent above the transition temperature has a pointed shape. Therefore, it is an advantageous form to form a through hole in the battery case.
[53]
When the venting member according to the present invention is in a restored form from a straight deformed form to a bent state, a part of the venting member passes through the battery case and is bent inside the battery cell, so that the bent venting member can be accommodated inside the battery cell. I need a space to have.
[54]
For example, when a stack-type electrode assembly is used as the electrode assembly, a space in which the electrode tab and the electrode lead connection part are located may be used as a space for accommodating the bent venting member.
[55]
As a first embodiment according to the present invention, FIG. 2 is a perspective view of a pouch-type battery cell including a unidirectional electrode assembly and an electrode assembly receiving portion formed only in an upper case.
[56]
Referring to FIG. 2, the pouch-type battery cell 100 has an upper case 110 in which an electrode assembly receiving part 111 is formed and an outer peripheral sealing part of the planar lower case 120 is sealed.
[57]
The electrode assembly receiving unit 111 accommodates a unidirectional electrode assembly in which the positive terminal 101 and the negative terminal 102 are formed in one direction, and a sealing part in which the positive terminal 101 and the negative terminal 102 are located ( 141) A venting member 131 is positioned on the outer surface of the electrode assembly housing 111 as an adjacent portion.
[58]
The venting member 131 may be formed of any one of the venting members illustrated in FIG. 1, and at a transition temperature or higher, one end or both ends are bent toward the battery case to form a restoration. A through hole is formed in the battery case by the restored venting member, and gas inside the battery cell may be discharged through the through hole.
[59]
However, it is preferable that the end of the bent venting member 131 does not come into contact with the electrode terminal, and in the case of using a unidirectional electrode assembly as shown in FIG. 2, only one end of the venting member 131 is bent so that it becomes a restored shape. Using and, the end of the bent venting member 131 may be accommodated in a space inside the battery cell positioned between the positive terminal 101 and the negative terminal 102.
[60]
As a second embodiment according to the present invention, FIG. 3 is a plan view of a pouch-type battery cell including a bidirectional electrode assembly.
[61]
Referring to FIG. 3, in the pouch-type battery cell 200, an electrode assembly receiving portion 211 is formed in an upper case 210, and a positive terminal 201 and a negative terminal 202 are formed in the electrode assembly receiving portion 211. A bidirectional electrode assembly with) protruding in opposite directions is accommodated.
[62]
The lower case of the pouch-type battery cell 200 may have a flat shape, or may have a structure in which an electrode assembly receiving portion is formed.
[63]
The venting member 231 is a portion adjacent to the sealing part 241 where the positive terminal 201 is located, and is located on the outer surface of the electrode assembly receiving part 211, and the venting member 232 is the negative terminal 202 where the negative terminal 202 is located. It is located on the outer surface of the electrode assembly accommodating part 211 as an adjacent part of the sealing part 242.
[64]
The venting member 231 may be formed of any one of the venting members illustrated in FIG. 1, and at a transition temperature or higher, one end or both ends are bent toward the battery case to form a restoration. A through hole is formed in the battery case by the restored venting member, and gas inside the battery cell may be discharged through the through hole.
[65]
In the case of including the bi-directional electrode assembly as shown in FIG. 3, it is preferable that a plurality of exhaust ports are formed so that gas discharge inside the battery cell can be quickly performed. ), which can be bent so that both ends are in a restored shape. Ends of the bent shaped venting members 231 and 232 may be accommodated in the internal space of the battery cell located on both sides of the positive terminal 201 and the negative terminal 202.
[66]
The pouch-type battery cell 200 of FIG. 3 may have a structure in which an electrode assembly receiving part is formed in the lower case. In this case, the electrode formed in the lower case is adjacent to the sealing part 241 where the positive terminal 201 is located. Venting members may be additionally added to each of the outer surface of the assembly receiving unit and on the outer surface of the electrode assembly receiving unit formed in the lower case as an adjacent portion of the sealing unit 242 where the negative terminal 202 is located.
[67]
When the electrode assembly accommodating part is formed in each of the upper case and the lower case, the size of the electrode assembly may increase, and gas generation may increase due to side reactions inside the battery cell. Therefore, by adding a venting member to each of the upper case and the lower case, rapid exhaust can be achieved. In addition, in the case of using a venting member whose both ends are deformed in a restored form, such as the venting member 20 of FIG. 1, it is preferable to obtain a quick exhaust effect because the number of exhaust ports increases.
[68]
As a third embodiment according to the present invention, FIG. 4 is an exploded perspective view of a pouch-type battery cell including a unidirectional electrode assembly and having an electrode assembly receiving portion formed in an upper case and a lower case.
[69]
Referring to FIG. 4, in the pouch-type battery cell 300, an electrode assembly receiving portion 311 is formed in an upper case 310, and an electrode assembly receiving portion 321 is formed in the lower case 320, A unidirectional electrode assembly in which the positive terminal 301 and the negative terminal 302 protrude in the same direction are accommodated therein.
[70]
The venting member 331 is adjacent to the sealing part 341 where the positive terminal 301 and the negative terminal 302 are located, and is located on the outer surface of the electrode assembly receiving part 311 of the upper case 310, and 332 is a portion adjacent to the sealing portion 341 in which the positive terminal 301 and the negative terminal 302 are located, and is positioned on the outer surface of the electrode assembly receiving portion 311 of the upper case 310.
[71]
The pouch-type battery cell 300 uses a unidirectional electrode assembly, and the venting members 331 and 332, like the venting member 131 of FIG. 2, use a venting member that is bent at only one end to form a restoration. , Ends of the bent venting members 331 and 332 may be accommodated in an inner space of the battery cell positioned between the positive terminal 301 and the negative terminal 302.
[72]
As in the pouch-type battery cells of FIGS. 2 to 4, when the venting member is positioned on the outer surface of the electrode assembly housing unit as a portion adjacent to the sealing part in the direction in which the electrode terminal is positioned, the electrode terminal is in a deformed state. It is located adjacent to the formed sealing part, and in the recovery state, the bent part is accommodated in a part treated as a dead space inside the battery cell, and the problem of increasing the size of the battery cell due to the addition of the venting member can be prevented.
[73]
In a fourth embodiment according to the present invention, the venting member may be located on an outer surface in a direction in which the electrode terminal is not located among the side surfaces of the electrode assembly receiving part.
[74]
In this regard, FIG. 5 is a perspective view of a pouch-type battery cell including a bi-directional electrode assembly and having an electrode assembly receiving portion formed only in an upper case.
[75]
5, the pouch-type battery cell 400 has an electrode assembly receiving portion 411 formed in an upper case 410, and the lower case 420 may have a flat shape, or an electrode assembly receiving portion formed therein. It can be a structure.
[76]
A two-way electrode assembly in which the positive terminal 401 and the negative terminal 402 protrudes in opposite directions is accommodated in the pouch-type battery cell 400 in the electrode assembly receiving part 411.
[77]
One venting member 431 is adjacent to the sealing portions 441 and 442 where the positive terminal 401 and the negative terminal 402 are not located, and is located on the outer surface of the electrode assembly receiving portion 411 of the upper case 410 It can be located over.
[78]
On the other hand, in the case of the structure in which the electrode assembly receiving part is formed in the lower case 420, a venting member is provided on the outer surface of the electrode assembly receiving part of the lower case 420 as adjacent to the sealing parts 441 and 442 where the electrode terminals are not located. May be additionally located.
[79]
In addition, in addition to the venting member 431 disposed adjacent to the negative terminal 402, a venting member may be additionally added at a position adjacent to the positive terminal 401 that is symmetrical thereto.
[80]
Unlike the venting members shown in FIGS. 2 to 4, the venting member 431 is located adjacent to the sealing part where the electrode terminal is not located, and thus, it is preferable that only the end in the direction close to the electrode terminal is restored. In addition, ends of the restored venting member may be accommodated in the internal space of the battery cell located on both sides of the positive terminal 401 and the negative terminal 402.
[81]
Additionally, the venting member 431 may be positioned on the outer surface of the electrode assembly receiving portion 411 of the upper case 410 as a portion adjacent to the sealing portion where the positive terminal 401 and/or the negative terminal 402 are located. .
[82]
In a fifth embodiment according to the present invention, the venting member may be positioned between the bent sealing part of the battery case and the side surface of the electrode assembly receiving part facing the bent sealing part.
[83]
In this regard, FIG. 6 shows a perspective view of a pouch-type battery cell in which the sealing portion is bent.
[84]
6, in the pouch-type battery cell 500, an electrode assembly receiving portion 511 is formed in an upper case 510, and an electrode assembly receiving portion 521 is formed in the lower case 520, A unidirectional electrode assembly in which the positive terminal 501 and the negative terminal 502 protrude in the same direction are accommodated therein.
[85]
The pouch-type battery cell 500 is in a state in which the sealing portion in the direction in which the electrode terminal does not protrude is bent, and a venting member between the bent sealing portion 540 and the side of the electrode assembly receiving portion 521 of the lower case 520 (531) is located.
[86]
Since the venting member 531 has the same shape as the venting member 431 of FIG. 5, only the end in the direction in which the negative terminal 502 is located is restored and may penetrate the battery case.
[87]
In addition, a venting member may be additionally positioned between the sealing part opposite to the bent sealing part 540 and the side surface of the electrode assembly receiving part, and the ends of the restored venting member 531 are positive terminal 401 and negative terminal It may be accommodated in the inner space of the battery cell outside the 402.
[88]
In the case of the pouch-type battery cell 500, the venting member is not located adjacent to the sealing part 541 in the direction in which the electrode terminal is located, but the venting member is located between the bent sealing part and the side of the electrode assembly receiving part. As such, it is preferable to apply the venting member 30 in the form of a thin and flat square pillar, such as the venting member 30 of FIG. 1.
[89]
The method of adding the venting member is not particularly limited as long as the venting member can be stably fixed to the outer surface of the pouch-type battery cell, and for example, an adhesive material may be applied and attached to the outer surface of the venting member, or , It can be fixed by adding a device that can physically mount the venting member.
[90]
Specifically, a venting member may be attached using an adhesive tape, or a groove into which the venting member may be inserted may be molded into a pouch case, and the venting member may be inserted into a pouch case or an electrode terminal. It is possible to use a method of attaching or physically fixing the venting member on the sealing part using a member of.
[91]
The present invention also provides a battery module including the pouch-type battery cell, wherein the pouch-type battery cell, a housing for accommodating one or more of the pouch-type battery cells, and the inside of the pouch-type battery cell A venting member for discharging gas may be included, and the venting member may be attached to a position facing the sealing portion of the pouch-type battery cell as an inner surface of the housing. In addition, a housing including a structure in which a venting member is inserted or mounted on the inner surface of the housing may be manufactured and used.
[92]
Specifically, the venting member may be attached or fixed in a position facing the sealing portion in the direction in which the electrode terminal of the pouch-type battery cell is located, or in a direction in which the electrode terminal of the pouch-type battery cell is not located. It can be attached or fixed at a position facing the sealing part.
[93]
In this regard, FIG. 7 shows an exploded view of a battery module including a pouch-type battery cell and a venting member.
[94]
Referring to FIG. 7, the battery module includes a pair of housings 651 and 652 surrounding the outer surface of the pouch-type battery cell 600, and electrodes of the pouch-type battery cell 600 as an inner surface of the housing 651 The venting member 631 is positioned at a position facing the sealing portion 642 in a direction in which the terminal is not positioned.
[95]
In addition, unlike FIG. 7, the battery module according to the present invention may have a form in which a venting member is added to the inner surface of the housing facing the sealing part 641 in the direction in which the electrode terminal is positioned.
[96]
The venting member 631 may be bent in the direction of the pouch-type battery cell 600 at a transition temperature and may be restored, and a through hole for discharging gas may be formed in the battery case by restoration of the venting member.
[97]
As shown in FIG. 7, since the venting member is added to a portion treated as a dead space inside the battery module as a portion adjacent to the sealing part of the pouch-type battery cell, it is possible to prevent the size of the battery module from being changed due to the addition of the venting member. have.
[98]
The present invention also provides a battery pack for accommodating the pouch-type battery cell, or a battery module including the same, an end plate coupled to the electrode terminal of the pouch-type battery cell, or the pouch-type battery cell A venting member may be added to the cooling fins in contact with the shape of the pouch-type battery cell to pass through the battery case.
[99]
In addition, the venting member may be fixed by mounting grooves, rings, or clips on the inner surface of the housing, end plates, or cooling fins.
[100]
In this way, the venting member is not a structure added to the outer surface of the pouch-type battery cell, and can be attached to the ent plate or cooling fin located adjacent to the pouch-type battery cell, and the venting member is restored above the transition temperature. When in the state, while being bent in the direction of the pouch-type battery cell, a through hole for discharging gas may be formed in the battery case.
[101]
The structure of the end plate and the cooling fin is not particularly limited, and may be applied in the case of having a structure that does not affect the overall size of the battery pack even when a venting member is applied.
[102]
As described above, since the venting member included in the pouch-type battery cell according to the present invention is made of a shape-memory alloy, the pouch-type battery cell can be designed to change its shape at a temperature required to discharge gas.
[103]
As described above, since the present invention includes a venting member made of a shape memory alloy material, the explosion and ignition of the battery cell can be prevented by venting at a desired temperature.
[104]
Those of ordinary skill in the field to which the present invention belongs will be able to perform various applications and modifications within the scope of the present invention based on the above contents.
[105]
(Explanation of code)
[106]
10, 20, 30, 131, 231, 232, 331, 332, 431, 531, 631: venting member
[107]
100, 200, 300, 400, 500, 600: pouch type battery cell
[108]
101, 201, 301, 401, 501: positive terminal
[109]
102, 202, 302, 402, 502: negative terminal
[110]
110, 210, 310, 410, 510: upper case
[111]
111, 211, 311, 321, 411, 511, 521: electrode assembly storage unit
[112]
120, 320,420, 520: lower case
[113]
141, 241, 242, 341, 541, 641: sealing portion where electrode terminals are located
[114]
441, 442, 642: sealing portion where electrode terminals are not located
[115]
540: bent sealing portion
[116]
651, 652: housing
Industrial availability
[117]
As described above, in the pouch-type battery cell according to the present invention, gas can be discharged by forming a through hole in the battery case at a desired temperature.
[118]
In addition, by adding the venting member to the outside of the battery cell, it is possible to prevent a problem in which the venting member located inside the battery cell causes a side reaction with an electrolyte or the like.
[119]
In addition, since the venting member is added to the excess space of the battery cell, it is possible to prevent an increase in the size of the battery cell due to the addition of the venting member.
Claims
[Claim 1]
A pouch-type battery cell including a battery case including a metal layer and a polymer resin layer, wherein the battery case has an electrode assembly storage part formed in at least one of an upper case and a lower case, and as an adjacent part of the sealing part of the battery case A pouch-type battery cell made of a shape memory alloy having a venting member disposed on an outer surface of the electrode assembly receiving part, and the venting member being deformed to penetrate the battery case when the temperature of the battery cell increases.
[Claim 2]
The pouch-type battery cell according to claim 1, wherein the venting member has a straight shape at a normal temperature, and at least one end is bent when the temperature increases.
[Claim 3]
The pouch-type battery cell of claim 1, wherein the venting member has a pointed end of the portion to be deformed.
[Claim 4]
The method of claim 1, wherein the battery case is a structure in which an electrode assembly storage unit is formed in an upper case and a lower case, the electrode assembly is a unidirectional electrode assembly in which an electrode terminal is formed in one direction, and the venting member includes the electrode terminal. A pouch-type battery cell positioned on an outer surface of the electrode assembly receiving portion as a portion adjacent to the sealing portion positioned.
[Claim 5]
The battery case according to claim 1, wherein the battery case is a structure in which an electrode assembly receiving part is formed in an upper case and a lower case, the electrode assembly is a bidirectional electrode assembly in which electrode terminals are formed in both directions, and the venting member includes the electrode terminals. A pouch-type battery cell positioned on an outer surface of an electrode assembly receiving portion of at least one of the upper case and the lower case as a portion adjacent to the sealing portion positioned or adjacent to the sealing portion where the electrode terminal is not positioned.
[Claim 6]
The pouch-type battery cell according to claim 1, wherein the venting member is located on an outer surface of a direction in which the electrode terminal is not located among side surfaces of the electrode assembly receiving part.
[Claim 7]
The pouch-type battery cell of claim 1, wherein the venting member is located between a bent sealing part of the battery case and a side surface of the electrode assembly receiving part facing the bent sealing part.
[Claim 8]
A battery module including a pouch-type battery cell, comprising: a pouch-type battery cell, a housing for accommodating one or more pouch-type battery cells, and a venting member for discharging internal gas of the pouch-type battery cell And the venting member is attached to a position facing the sealing part of the pouch-type battery cell as an inner surface of the housing.
[Claim 9]
The battery module of claim 8, wherein the venting member is attached to a position facing the sealing part in a direction in which the electrode terminal of the pouch-type battery cell is located.
[Claim 10]
The battery module of claim 8, wherein the venting member is attached to a position facing the sealing part in a direction in which the electrode terminal of the pouch-type battery cell is not located.
[Claim 11]
As a battery pack for accommodating a pouch-type battery cell, or a battery module including the same, an end plate coupled to an electrode terminal of the pouch-type battery cell, or a cooling fin in contact with the pouch-type battery cell by temperature change A battery pack having a modified shape and a venting member penetrating the battery case of the pouch-type battery cell.