Title of invention: secondary battery and battery pack including the same
Technical field
[One]
This application is an application for claiming priority for Korean Patent Application No. 10-2018-0019432 filed on February 19, 2018, and all contents disclosed in the specification and drawings of the application are incorporated herein by reference.
[2]
The present invention relates to a secondary battery and a battery pack, and more particularly, to a secondary battery configured to effectively estimate a lifespan or a deterioration state while the secondary battery is deteriorating, and a battery pack including the same.
Background
[3]
In recent years, as the demand for portable electronic products such as notebook computers, video cameras, portable telephones, etc. is rapidly increasing, and development of electric vehicles, energy storage batteries, robots, satellites, etc. is in earnest, high-performance secondary batteries capable of repetitive charging and discharging Research on is being actively conducted.
[4]
Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries, among which lithium secondary batteries have little memory effect compared to nickel-based secondary batteries, so charging and discharging are free. The self-discharge rate is very low and the energy density is high.
[5]
These lithium secondary batteries mainly use lithium-based oxides and carbon materials as a positive electrode active material and a negative electrode active material, respectively. A lithium secondary battery includes an electrode assembly in which a positive electrode plate and a negative electrode plate to which the positive electrode active material and the negative electrode active material are applied, respectively, are disposed with a separator therebetween, and an exterior material that seals and accommodates the electrode assembly together with an electrolyte solution, that is, a battery case.
[6]
In general, lithium secondary batteries may be classified into can-type secondary batteries in which an electrode assembly is embedded in a metal can and secondary batteries in which an electrode assembly is embedded in a pouch of an aluminum laminate sheet, according to the shape of the exterior material. In general, such secondary batteries are manufactured through a process in which an electrolyte is injected while the electrode assembly is accommodated in the exterior material and the exterior material is sealed.
[7]
In recent years, as the application range of such secondary batteries is expanded, secondary batteries are widely used not only in small portable devices including smart phones, but also in mid- to large-sized devices such as electric vehicles and power storage devices including hybrid vehicles.
[8]
In the case of such a secondary battery, as the use period increases, the performance deteriorates from the initial stage. In addition, estimating the degree of performance degradation of the secondary battery is called estimating the state of health (SOH) of the secondary battery, and the SOH of the secondary battery is an important factor in determining the replacement timing of the secondary battery.
[9]
In addition, the secondary battery may have a different degree of deterioration for each secondary battery depending on a manufacturing environment or a use environment of the secondary battery. And, in the case of a battery pack including a plurality of secondary batteries, there is a need to accurately predict the life of each secondary battery according to each degree of deterioration. Typically, the BMS (Battery Management System) can efficiently operate the battery pack based on the accurate prediction of the lifespan of each secondary battery included in the battery pack.
Detailed description of the invention
Technical challenge
[10]
The present invention is invented under the background of the prior art as described above, and relates to an improved secondary battery capable of effectively estimating the life or deterioration state of a secondary battery in the process of deteriorating the secondary battery.
[11]
Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by examples of the present invention. In addition, it will be easily understood that the objects and advantages of the present invention can be realized by the means shown in the claims and combinations thereof.
Means of solving the task
[12]
A secondary battery according to an aspect of the present invention includes an exterior material including an upper cover and a lower cover, and the outer peripheral portions of the upper cover and the lower cover are sealed; A plurality of first electrode plates, a plurality of second electrode plates stacked to cross the plurality of first electrode plates with a separator interposed therebetween, and at least one of the plurality of first electrode plates having the same polarity as the first electrode plate A first measuring plate and a second measuring plate included in one, a first electrode tab extending from the first electrode plate, a second electrode tab extending from the second electrode plate, a first extending from the first measuring plate An electrode assembly including a measurement tab and a second measurement tab extending from the second measurement plate; A first electrode lead configured to have one end in contact with the first electrode tab and the other end exposed to the outside of the exterior material; A second electrode lead configured such that one end is in contact with the second electrode tab and the other end is exposed to the outside of the exterior material; A first measurement lead configured to have one end in contact with the first measurement tab and the other end exposed to the outside of the exterior material; And a second measurement lead configured such that one end is in contact with the second measurement tab and the other end is exposed to the outside of the exterior material.
[13]
The first electrode plate and the second electrode plate may have different polarities.
[14]
The first measurement plate and the second measurement plate may be included in any one of the plurality of first electrode plates spaced apart by a predetermined distance.
[15]
The electrode assembly may further include an insulating member configured to fix the first measurement plate and the second measurement plate, and electrically insulate between the first measurement plate and the second measurement plate.
[16]
The first measurement plate and the second measurement plate may be included in any two electrode plates of the plurality of first electrode plates, respectively.
[17]
The electrode assembly may be configured such that the first electrode lead, the second electrode lead, the first measurement lead, and the second measurement lead are positioned on the same plane, so that the respective longitudinal directions face the same direction.
[18]
The first measurement tab may be configured to be integrated with the first measurement lead in the form of a single plate.
[19]
The second measurement tab may be configured to be integrated with the second measurement lead in the form of one plate.
[20]
The positive electrode lead, the negative electrode lead, the first measurement lead, and the second measurement lead may be configured to protrude in the same direction from the exterior material.
[21]
The positive electrode lead, the negative electrode lead, the first measurement lead, and the second measurement lead may be bent in the same direction among upper or lower directions.
[22]
A battery pack according to another aspect of the present invention may include a secondary battery according to an aspect of the present invention.
Effects of the Invention
[23]
According to an aspect of the present invention, in a secondary battery, as the secondary battery deteriorates, a structure capable of externally measuring a reaction non-uniformity occurring in a planar direction of a plurality of electrode plates provided in an electrode assembly is provided. It has the advantage of helping to more easily and accurately judge the degree of deterioration of the.
[24]
In particular, according to an embodiment of the present invention, in the case of a secondary battery, by measuring the potential difference between two electrode plates replacing one or two electrode plates, it is possible to accurately measure the degree of this reaction unevenness. Through this, an improved secondary battery capable of effectively estimating the life or deterioration state of the secondary battery may be provided.
[25]
In addition to the present invention may have a variety of other effects, these other effects of the present invention can be understood by the following description, can be more clearly understood by the embodiments of the present invention.
Brief description of the drawing
[26]
The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of ​​the present invention together with the detailed description of the present invention to be described later, so the present invention is described in such drawings. It is limited to and should not be interpreted.
[27]
1 is an exploded perspective view schematically showing a configuration of a secondary battery according to an embodiment of the present invention.
[28]
2 is a perspective view illustrating the secondary battery shown in FIG. 1.
[29]
3 is an exploded perspective view schematically showing the configuration of an electrode assembly according to an embodiment of the present invention.
[30]
4 and 5 are perspective views schematically showing a coupling configuration of a measuring plate and an insulating member according to different embodiments of the present invention.
[31]
6 is an exploded perspective view schematically showing a configuration of an electrode assembly according to another embodiment of the present invention.
[32]
7 is a perspective view schematically showing a configuration of a secondary battery according to an embodiment of the present invention.
Mode for carrying out the invention
[33]
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to describe their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of ​​the present invention.
[34]
Accordingly, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, and thus various alternatives that can be replaced at the time of application It should be understood that there may be equivalents and variations.
[35]
In addition, in describing the present invention, when it is determined that a detailed description of a related known configuration or function may obscure the subject matter of the present invention, the detailed description thereof will be omitted.
[36]
Throughout the specification, when a certain part "includes" a certain component, it means that other components may be further included, rather than excluding other components unless specifically stated to the contrary.
[37]
In addition, throughout the specification, when a part is said to be "connected" to another part, it is not only "directly connected", but also "indirectly connected" with another element interposed therebetween. Include.
[38]
[39]
FIG. 1 is an exploded perspective view schematically illustrating a configuration of a secondary battery according to an exemplary embodiment of the present invention, and FIG. 2 is a combined perspective view of the secondary battery illustrated in FIG. 1.
[40]
1 and 2, the secondary battery 1 according to the present invention includes an exterior material 200, an electrode assembly 100, a positive electrode lead 310, a negative electrode lead 320, and a first measurement lead 330. And a second measurement lead 340. The secondary battery 1 may be a pouch type.
[41]
The exterior material 200 has a concave inner space, and the electrode assembly 100 and an electrolyte may be accommodated in the inner space.
[42]
In particular, the exterior material 200 may be composed of an upper cover 210 and a lower cover 220, and in this case, the concave inner space is the upper cover 210 and the lower cover 220 as shown in FIG. Can be formed on all.
[43]
The exterior material 200 may be configured in a form in which outer peripheral portions of the upper cover 210 and the lower cover 220 are sealed. That is, the upper cover 210 and the lower cover 220 each have a sealing portion (S) on the rim of the inner space, and the sealing portion (S) is sealed by a method such as heat fusion, so that the interior of the exterior material 200 The space can be closed.
[44]
The electrode assembly 100 includes a separator, a plurality of first electrode plates 110, a plurality of second electrode plates 120, a plurality of first electrode tabs 111, a plurality of second electrode tabs 121, and It may include a 1 measuring plate, a second measuring plate, a first measuring tab and a second measuring tab. Hereinafter, for convenience of explanation, it is assumed that the first electrode plate is a positive electrode plate and the second electrode plate is a negative electrode plate. In this case, the first electrode tab may be referred to as an anode tab, and the second electrode tab may be referred to as a negative electrode tab. Of course, it is not limited that the first electrode plate is a negative plate and the second electrode plate is a positive plate.
[45]
The configuration of the electrode assembly 100 will be described in detail with reference to FIG. 3. 3 is an exploded perspective view schematically showing the configuration of an electrode assembly according to an embodiment of the present invention. However, for convenience of description, the separator is not shown in FIG. 3. Referring to FIG. 3, the electrode assembly 100 includes a plurality of electrode plates 110, 120, 130, and 140 with a separator therebetween. In particular, a plurality of electrode plates are accommodated in the inner space of the exterior material 200 in a stacked form with a separator therebetween. More specifically, the electrode assembly 100 may be configured in a form in which a plurality of positive plates 110 and a plurality of negative plates 120 are stacked in the vertical direction.
[46]
Here, the electrode plate is composed of a positive electrode plate 110 or a negative electrode plate 120, and the electrode assembly 100 is stacked so that the positive electrode plate 110 and the negative electrode plate 120 face each other with a separator interposed therebetween. It can be configured in a form. That is, the electrode assembly 100 may be configured in a form in which the positive plate 110 and the negative plate 120 are alternately stacked with a separator interposed therebetween, and the positive plate 110 and the negative plate 120 are disposed to be spaced apart from each other by a predetermined distance. do. In addition, the positive electrode plate 110 and the negative electrode plate 120 are formed in a structure in which an active material slurry is applied to a current collector, and the slurry is usually formed by stirring a granular active material, an auxiliary conductor, a binder, and a plasticizer while a solvent is added. Can be.
[47]
The positive electrode tab 111 may extend from the plurality of positive electrode plates 110, and the negative electrode tab 121 may extend from the plurality of negative electrode plates 120. More specifically, the positive electrode tab 111 may be provided on the non-coated portion of the positive electrode plate 110 to which the positive electrode active material is not applied, and the negative electrode tab 121 is provided on the non-coated portion of the negative plate 120 to which the negative active material is not applied. Can be. For example, the positive electrode tab 111 and the negative electrode tab 121 are formed to protrude from the electrode plate, and the electrode plate is cut out or a metal plate of the same or different material is attached to the electrode plate. Can be formed.
[48]
The first measurement plate 130 and the second measurement plate 140 are configured to have the same polarity. For example, both the first measurement plate 130 and the second measurement plate 140 may be plates having a positive or negative polarity. More specifically, the first measurement plate 130 and the second measurement plate 140 are configured in a form in which a positive electrode active material is applied on the surface of an aluminum current collector, or a negative active material is applied on the surface of an aluminum current collector. Can be.
[49]
The first measurement plate 130 and the second measurement plate 140 may be provided in place of at least one of the positive electrode plate 110 and the negative electrode plate 120. More specifically, the one positive plate 110 or negative plate 120 in place of at least one positive plate 110 or negative plate 120 among a plurality of positive plates 110 and negative plates 120 stacked alternately in the vertical direction The first measuring plate 130 and the second measuring plate 140 may be provided at the position of.
[50]
For example, the first measurement plate 130 and the second measurement plate 140 may be provided at a position of the one positive electrode plate 110 in place of the one positive electrode plate 110. In this case, both the first measurement plate 130 and the second measurement plate 140 may be plates having a positive polarity. Similarly, the first measurement plate 130 and the second measurement plate 140 may be provided at a position of the one negative electrode plate 120 in place of the one negative electrode plate 120. In this case, both the first measurement plate 130 and the second measurement plate 140 may be plates having a negative polarity.
[51]
The first measuring tab 131 is electrically connected to the first measuring plate 130, and the second measuring tab 141 is electrically connected to the second measuring plate 140. Here, the first measurement tab 131 may extend from the first measurement plate 130, and the second measurement tab 141 may extend from the second measurement plate 140. More specifically, the first measurement tab 131 is provided on the uncoated portion of the first measurement plate 130 to which the anode active material is not applied, and 2 Measurement tabs 141 may be provided. For example, the first measurement tab 131 and the second measurement tab 141 may be formed to protrude from the first measurement plate 130 and the second measurement plate 140. At this time, the first measurement tab 131 and the second measurement tab 141 are in a form in which the first measurement plate 130 and the second measurement plate 140 are cut off, or the first measurement plate 130 and the second measurement It may be formed in a form in which a metal plate of the same or different material is attached to the plate 140.
[52]
The positive electrode lead 310 is configured such that one end is in electrical contact with the positive electrode tab 111 and the other end is exposed to the outside of the exterior material 200. In addition, a portion of the anode lead 310 is interposed in the exterior material 200. More specifically, a plurality of positive electrode tabs 111 formed to protrude from each of the plurality of positive electrode plates 110 may be connected to the positive electrode lead 310 while in contact with each other. In this case, the connection between the plurality of positive electrode tabs 111 and/or the connection between the positive electrode tab 111 and the positive electrode lead 310 may be performed by welding or the like. For example, as shown in FIG. 1, the anode lead 310 may be directly connected to a plurality of anode tabs 111 formed to protrude from the plurality of anode plates 110.
[53]
In addition, the anode lead 310 may be interposed between the upper cover 210 and the lower cover 220 so that a part of the anode lead 310 may be located in the inner space of the exterior material 200. In addition, the remaining portion of the anode lead 310 may be exposed to the outside of the exterior material 200. For example, as shown in FIG. 2, the anode lead 310 is formed to protrude in the outer direction of the exterior material 200, so that a part of the anode lead 310 may be exposed to the outside of the exterior material 200.
[54]
One end of the negative lead 320 is in electrical contact with the negative electrode tab 121 and the other end of the negative lead 320 is configured to be exposed to the outside of the exterior material 200. In addition, a portion of the cathode lead 320 is interposed in the exterior material 200. More specifically, a plurality of negative electrode tabs 121 formed to protrude from each of the plurality of negative electrode plates 120 may be connected to the negative electrode lead 320 in contact with each other. In this case, the connection between the plurality of negative electrode tabs 121 and/or the connection between the negative electrode tab 121 and the negative electrode lead 320 may be performed by welding or the like. For example, as shown in FIG. 1, the negative electrode lead 320 may be directly connected to the plurality of negative electrode tabs 121 formed to protrude from the plurality of negative electrode plates 120.
[55]
In addition, the cathode lead 320 may be interposed between the upper cover 210 and the lower cover 220 so that a part of the cathode lead 320 may be located in the inner space of the exterior material 200. In addition, the rest of the cathode lead 320 may be exposed to the outside of the exterior material 200. For example, as shown in FIG. 2, the cathode lead 320 is formed to protrude in the outer direction of the exterior material 200, so that a part of the cathode lead 320 may be exposed to the outside of the exterior material 200.
[56]
One end of the first measurement lead 330 is in electrical contact with the first measurement tab 131 and the other end of the first measurement lead 330 is exposed to the outside of the exterior material 200. In addition, a portion of the first measurement lead 330 is interposed in the exterior material 200. More specifically, a first measurement tab 131 formed to protrude from the first measurement plate 130 may be connected to the first measurement lead 330. In this case, the connection between the first measurement tab 131 and the first measurement lead 330 may be performed by welding or the like. For example, as shown in FIG. 1, the first measurement lead 330 may be directly connected to the first measurement tab 131 formed to protrude from the first measurement plate 130.
[57]
In addition, the first measurement lead 330 may be interposed between the upper cover 210 and the lower cover 220 so that a part of the first measurement lead 330 may be located in the inner space of the exterior material 200. In addition, the rest of the first measurement lead 330 may be exposed to the outside of the exterior material 200. For example, as shown in FIG. 2, the first measurement lead 330 is formed to protrude in the outer direction of the exterior material 200, so that a part of the first measurement lead 330 may be exposed to the outside of the exterior material 200.
[58]
One end of the second measurement lead 340 is configured to be in electrical contact with the second measurement tab 141, and the other end of the second measurement lead 340 is exposed to the outside of the exterior material 200. In addition, a part of the second measurement lead 340 is interposed in the exterior material 200. More specifically, the second measurement tab 141 protruding from the second measurement plate 140 may be connected to the second measurement lead 340. In this case, the connection between the second measurement tab 141 and the second measurement lead 340 may be performed by welding or the like. For example, as shown in FIG. 1, the second measurement lead 340 may be directly connected to the second measurement tab 141 formed to protrude from the second measurement plate 140.
[59]
In addition, the second measurement lead 340 may be interposed between the upper cover 210 and the lower cover 220 so that a part of the second measurement lead 340 may be located in the inner space of the exterior material 200. In addition, the rest of the second measurement lead 340 may be exposed to the outside of the exterior material 200. For example, as shown in FIG. 2, the second measurement lead 340 is formed to protrude in the outer direction of the exterior material 200, so that a portion of the exterior material 200 may be exposed to the outside.
[60]
In the present invention, the state of the secondary battery may be estimated using the first measurement lead 330 and the second measurement lead 340. In particular, according to the present invention, a lifespan or a deterioration state of the secondary battery may be estimated by using a potential difference between the first measurement lead 330 and the second measurement lead 340. For example, when the secondary battery 1 deteriorates, a potential difference occurs between the first measurement lead 330 and the second measurement lead 340, and the life of the secondary battery may be estimated according to the degree of the generated potential difference.
[61]
The first measurement tab 131 may be configured to be integrated with the first measurement lead 330 in the form of a single plate. In addition, the second measurement tab 141 may be configured to be integrated with the second measurement lead 340 in the form of a single plate.
[62]
In addition, the positive lead 310, the negative lead 320, the first measurement lead 330, and the second measurement lead 340 may be in the same direction from the exterior material 200. For example, as shown in FIGS. 1 and 2, the positive lead 310, the negative lead 320, the first measurement lead 330, and the second measurement lead 340 are + It may protrude in the y-axis direction.
[63]
According to this configuration of the present invention, it is possible to easily measure voltages for the first measurement lead and the second measurement lead. In particular, the first measurement lead 330 and the second measurement lead 340 may easily contact a measurement terminal configured to be connected to the first measurement lead 330 and the second measurement lead 340.
[64]
In addition, the first measuring tab 131 and the second measuring tab 141 are between the positive electrode tab 111 and the negative electrode tab 121, in a horizontal direction with the position of the positive electrode tab 111 and the negative electrode tab 121 It can be formed in different locations. That is, the first measurement lead 330 and the second measurement lead 340 may be formed to be parallel to the positive lead 310 and the negative lead 320. For example, as shown in FIG. 1, the first measurement tab 131 and the second measurement tab 141 are between the positive electrode tab 111 and the negative electrode tab 121, and the positive electrode tab 111 and the negative electrode tab It may be formed at a location spaced apart from 121 by a predetermined distance in the x-axis or x- and z-axis directions. In addition, the anode lead 310, the cathode lead 320, the first measurement lead 330, and the second measurement lead 340 are formed in parallel, so that the anode lead 310 and the cathode lead protruding out of the exterior material 200 320), portions of the first measurement lead 330 and the second measurement lead 340 may be parallel. Specifically, the anode lead 310, the cathode lead 320, the first measurement lead 330, and the second measurement lead 340 are located on the same virtual plane, so that each longitudinal direction can face the same direction. have. For example, referring to FIG. 2, the anode lead 310, the cathode lead 320, the first measurement lead 330, and the second measurement lead 340 are located on the same plane, and the top surfaces of each are parallel, Each longitudinal direction may equally face the +y direction. According to this configuration of the present invention, charging and discharging of the secondary battery and estimation of the state of the secondary battery can be easily performed. In particular, according to this configuration of the present invention,
[65]
[66]
Referring to FIG. 3, the electrode assembly 100 according to the present invention may be configured in a form in which a plurality of electrode plates are stacked in a vertical direction. In particular, the first measurement plate 130 and the second measurement plate 140 may be provided in place of at least one of the plurality of positive electrode plates 110 and negative electrode plates 120. More specifically, the first measurement plate 130 and the second measurement plate 140 may be stacked on the same layer in the electrode assembly 100 in which a plurality of electrode plates are stacked.
[67]
For example, as shown in FIG. 3, the first measuring plate 130 and the second measuring plate 140 may be provided at the position of the one positive plate 110 in place of the one positive plate 110. have. That is, the first measurement plate 130 and the second measurement plate 140 may be provided on the same layer between the two negative electrode plates 120. Further, although not shown in the drawings, the first measurement plate 130 and the second measurement plate 140 may be provided at a position of the one negative electrode plate 120 instead of the one negative electrode plate 120. That is, the first measurement plate 130 and the second measurement plate 140 may be provided on the same layer between the two positive electrode plates 110. According to this configuration of the present invention, since it is possible to measure the potential difference due to non-uniformity inside the interest battery, it is possible to more accurately estimate the state of the secondary battery.
[68]
[69]
The electrode assembly 100 according to the present invention may further include an insulating member 150. This will be described in more detail with reference to FIGS. 4 and 5. 4 and 5 are perspective views schematically showing a coupling configuration between a measuring plate and an insulating member according to different embodiments of the present invention.
[70]
4 and 5, the insulating member 150 may fix the first measurement plate 130 and the second measurement plate 140. More specifically, the insulating member 150 includes the first measuring plate 130 and the second measuring plate 130 so that the first measuring plate 130 and the second measuring plate 140 can be positioned side by side on one layer among a plurality of electrode plates. The measuring plate 140 may be fixed.
[71]
For example, as shown in FIG. 4, the insulating member 150 is made of an insulating material, and may be implemented as a plate having the same size as other electrode plates provided in the electrode assembly 100. In addition, an inner space 151 having the same size as the area of ​​the first and second measurement plates 130 and 140 may be formed in the insulating member 150. Here, the inner space 151 may be an empty space having the same size as the area of ​​the first measurement plate 130 and the second measurement plate 140 and open at the top and bottom and penetrated in the vertical direction. In addition, the first measuring plate 130 and the second measuring plate 140 may be provided in the inner space 151. Here, the first measuring plate 130 and the second measuring plate 140 may be fitted and fixed in the inner space 151 of the insulating member 150 in the direction a of FIG. 4. In this case, the inner space into which the first measuring plate 130 is inserted and the inner space into which the second measuring plate 140 is inserted may be configured to be spaced apart by a predetermined distance in the first direction. Here, the first direction may include the x-axis direction shown in FIGS. 2 and 3. Accordingly, the first measuring plate 130 and the second measuring plate 140 are mounted on the insulating member 150 to maintain an insulating state. As another example, as shown in FIG. 5, the insulating member 150 is made of an insulating material, and may be positioned between the first measuring plate 130 and the second measuring plate 140. For example, the insulating member 150 may be formed in the form of a rod extending in the longitudinal direction of the first measuring plate 130 and the second measuring plate 140. In addition, the insulating member 150 is in a horizontal direction, that is, in a state where the wide surface is laid to face the top and the bottom, It is interposed between the first measuring plate 130 and the second measuring plate 140 arranged parallel to each other in the first direction, so that the first measuring plate 130 and the second measuring plate 140 can be spaced apart. have. The first measurement plate 130 and the second measurement plate 140 may be electrically insulated through the insulating member 150.
[72]
In particular, the insulating member 150 may be configured in a form in which the first measuring plate 130 and the second measuring plate 140 can be fitted to the insulating member 150. More specifically, the insulating member 150 may include an inner groove 152. The inner groove 152 is the length of the first measuring plate 130 and the second measuring plate 140 so that the first measuring plate 130 and the second measuring plate 140 can be bound to the inner groove 152 It can be formed long in the direction. Here, the first measurement plate 130 and the second measurement plate 140 may be fitted and fixed in the inner groove 152 of the insulating member 150 in the direction a of FIG. 5.
[73]
In addition, the insulating member 150 may be configured to electrically insulate between the first measuring plate 130 and the second measuring plate 140. More specifically, the insulating member 150 includes the first measuring plate 130 and the second measuring plate 140 so that the distance between the first measuring plate 130 and the second measuring plate 140 can be maintained by a predetermined distance. Can be separated. In addition, the insulating member 150 may be made of an insulating material and configured so that the first measuring plate 130 and the second measuring plate 140 are not in contact. For example, as shown in FIGS. 4 and 5, the first measurement plate 130 and the second measurement plate 140 may be spaced apart from each other by the insulating member 150 so as not to contact each other.
[74]
[75]
6 is an exploded perspective view schematically showing a configuration of an electrode assembly according to another embodiment of the present invention. However, for convenience of explanation, the separator is not shown in FIG. 6 as well. In addition, in the present embodiment, a detailed description of portions to which the description of the previous embodiment can be similarly applied will be omitted, and portions with differences will be mainly described.
[76]
Referring to FIG. 6, the electrode assembly 100 according to the present invention may be configured in a form in which a plurality of electrode plates 110, 120, 130, and 140 are stacked in a vertical direction. In particular, the first measurement plate 130 and the second measurement plate 140 are provided at the positions of the two electrode plates in place of the two electrode plates having the same polarity among the plurality of positive plate 110 and the negative plate 120 Can be. That is, the first measurement plate 130 is provided in place of any one of the plurality of positive electrode plates 110 and the negative electrode plate 120, and the second measurement plate 140 includes a plurality of positive plates 110 and negative plates. Among 120, it may be provided in place of another electrode plate having the same polarity as the specific electrode plate. The first measurement plate 130 and the second measurement plate 140 may be configured to be stacked on different layers.
[77]
For example, as shown in FIG. 6, each of the first measurement plate 130 and the second measurement plate 140 is provided at the positions of the two positive plates 110 instead of the two positive plates 110 Can be. That is, the first measuring plate 130 is provided at the position of the first positive plate among the plurality of positive plates 110, and the second measuring plate 140 is a second plate not identical to the first positive plate among the plurality of positive plates 110. It may be provided at the position of the positive plate. Therefore, the first measuring plate 130 and the second measuring plate 140 are provided between the negative electrode plate 120, respectively, and the first measuring plate 130 and the second measuring plate 140 may be provided on different layers. have.
[78]
In addition, although not shown in the drawings, the first measurement plate 130 and the second measurement plate 140 may be provided at positions of the two negative plates 120 instead of the two negative plates 120. That is, the first measuring plate 130 is provided at a position of the first negative plate among the plurality of negative plates 120, and the second measuring plate 140 is a second plate not identical to the first negative plate among the plurality of negative plates 120. It may be provided at the position of the negative plate. Therefore, the first measurement plate 130 and the second measurement plate 140 are provided between the positive electrode plate 110, respectively, and the first measurement plate 130 and the second measurement plate 140 may be provided on different layers. have.
[79]
According to this configuration of the present invention, the first measurement plate and the second measurement plate are not included to be spaced apart by a predetermined distance in any one of the positive or negative plate, but two positive plates selected from a plurality of positive plates or two selected from a plurality of negative plates Since the secondary battery according to the present invention can be manufactured by replacing the negative electrode plate with the first measuring plate and the second measuring plate, manufacturing of the secondary battery can be made easier.
[80]
[81]
7 is a perspective view schematically showing a configuration of a secondary battery according to an embodiment of the present invention.
[82]
Referring to FIG. 7, the secondary battery 1 according to an exemplary embodiment of the present invention may be fixed by taping an outer surface. For example, the secondary battery 1 may have a rectangular parallelepiped shape by taping an outer surface. Alternatively, the secondary battery 1 may be configured in a shape in which an outer surface is wrapped in a case.
[83]
Further, the secondary battery 1 may have a plurality of leads on one side. For example, the secondary battery 1 may include a positive electrode lead 310, a negative electrode lead 320, a first measurement lead 330 and a second measurement lead 340 on one side in the +y-axis direction of FIG. 7. I can.
[84]
Preferably, the anode lead 310, the cathode lead 320, the first measurement lead 330, and the second measurement lead 340 according to the present invention may be formed to be bent upward or downward. More specifically, the positive lead 310, the negative lead 320, the first measurement lead 330, and the second measurement lead 340 are bent in an upper or lower direction, so that a flat surface is in the outer direction of the secondary battery 1 It can be configured to face. For example, as shown in the configuration of FIG. 7, the positive lead 310, the negative lead 320, the first measurement lead 330, and the second measurement lead 340 are in the +z axis direction or the -z axis. It is bent in the same direction among the directions, and the flat top surface may be configured to face the +y-axis direction. According to this configuration of the present invention, a plurality of leads can easily contact a measurement terminal or the like.
[85]
The secondary battery according to an embodiment of the present invention may be connected to a secondary battery state estimation apparatus. Here, the secondary battery state estimating device is a device that estimates the state of the secondary battery and further, the deterioration state of the secondary battery. In addition, the secondary battery state estimation apparatus may estimate the life or deterioration state of the secondary battery through the secondary battery state estimation. In particular, the secondary battery state estimation apparatus is configured to be connected to each lead side of the secondary battery 1 so that the life of the secondary battery can be estimated.
[86]
The secondary battery according to the present invention may be provided in the battery pack itself. That is, the battery pack according to the present invention may include the secondary battery according to the present invention described above. Here, the battery pack may include a plurality of secondary batteries, the secondary batteries, electrical equipment (BMS, relays, fuses, etc.), and a case.
[87]
As described above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of ​​the present invention and the following by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equivalent range of the claims to be described.
[88]
[89]
(Explanation of code)
[90]
1: pouch-type secondary battery 2: secondary battery state estimation device
[91]
100: electrode assembly 110: positive plate
[92]
111: positive tab 120: negative plate
[93]
121: negative electrode tab 130: first measurement plate
[94]
131: first measuring tab 140: second measuring plate
[95]
141: second measuring tab 150: insulating member
[96]
151: inner space 152: inner groove
[97]
200: pouch exterior material 210: upper pouch
[98]
220: lower pouch 310: positive lead
[99]
320: negative lead 330: first measurement lead
[100]
340: second measurement lead
Claims
[Claim 1]
An exterior material having an upper cover and a lower cover, and having an outer peripheral portion of the upper cover and the lower cover sealed; A plurality of first electrode plates, a plurality of second electrode plates stacked to cross the plurality of first electrode plates with a separator interposed therebetween, and at least one of the plurality of first electrode plates having the same polarity as the first electrode plate A first measuring plate and a second measuring plate included in one, a first electrode tab extending from the first electrode plate, a second electrode tab extending from the second electrode plate, a first extending from the first measuring plate An electrode assembly including a measurement tab and a second measurement tab extending from the second measurement plate; A first electrode lead configured to have one end in contact with the first electrode tab and the other end exposed to the outside of the exterior material; A second electrode lead configured such that one end is in contact with the second electrode tab and the other end is exposed to the outside of the exterior material; A first measurement lead configured to have one end in contact with the first measurement tab and the other end exposed to the outside of the exterior material; And a second measurement lead having one end in contact with the second measuring tab and the other end exposed to the outside of the exterior material, wherein the first electrode plate and the second electrode plate have different polarities. battery.
[Claim 2]
The secondary battery of claim 1, wherein the first and second measurement plates are included in any one of the plurality of first electrode plates at a predetermined interval.
[Claim 3]
The method of claim 2, wherein the electrode assembly further comprises an insulating member configured to fix the first measurement plate and the second measurement plate, and electrically insulate between the first measurement plate and the second measurement plate. A secondary battery, characterized in that.
[Claim 4]
The secondary battery of claim 1, wherein the first measurement plate and the second measurement plate are included in any two electrode plates of the plurality of first electrode plates, respectively.
[Claim 5]
The method of claim 1, wherein the electrode assembly is configured such that the first electrode lead, the second electrode lead, the first measurement lead, and the second measurement lead are positioned on the same plane, and each longitudinal direction faces the same direction. Secondary battery.
[Claim 6]
The method of claim 1, wherein the first measurement tab is configured to be integrated with the first measurement lead in a plate shape, and the second measurement tab is configured to be integrated with the second measurement lead in a plate shape. A secondary battery, characterized in that.
[Claim 7]
The secondary battery according to claim 1, wherein the positive electrode lead, the negative electrode lead, the first measurement lead, and the second measurement lead are configured to protrude from the exterior material in the same direction.
[Claim 8]
The secondary battery of claim 7, wherein the positive electrode lead, the negative electrode lead, the first measurement lead and the second measurement lead are bent in the same direction of an upper or lower direction.
[Claim 9]
A battery pack comprising the secondary battery according to any one of claims 1 to 8.