KR20210121649A - Battery module comprising hydraulic cylinder, battery pack and secondary battery evaluation apparatus comprising the same - Google Patents

Abstract

A battery module including a hydraulic cylinder, a battery pack including the same, and a secondary battery evaluation device including the same according to the present invention can easily support a battery cell stack regardless of the number of accommodated battery cells by including the hydraulic cylinder that controls a distance between the battery cell stack and a side wall of a housing inside the housing in which the battery cell stack is accommodated, and can easily perform temperature behavior or performance evaluation of a secondary battery module.

Description

A battery module including a hydraulic cylinder, a battery pack including the same, and a secondary battery evaluation device including the same

The present invention relates to a battery module including a hydraulic cylinder, a battery pack including the same, and a secondary battery evaluation device including the same.

Currently commercialized secondary batteries include nickel cadmium batteries, nickel hydride batteries, nickel zinc batteries, and lithium secondary batteries. The self-discharge rate is very low and the energy density is high, attracting attention.

These lithium secondary batteries mainly use a lithium-based oxide and a carbon material 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 a packaging material for sealing and housing the electrode assembly together with an electrolyte, that is, a pouch exterior material.

According to the shape of a typical lithium secondary battery packaging material, it may be classified into a can-type secondary battery in which the electrode assembly is embedded in a metal can and a pouch-type secondary battery in which the electrode assembly is embedded in a pouch of an aluminum laminate sheet.

In recent years, secondary batteries have been widely used not only in small devices such as portable electronic devices, but also in medium and large devices such as automobiles and power storage devices. In particular, as carbon energy is gradually depleted and interest in the environment is increasing, hybrid vehicles and electric vehicles are attracting public attention around the world including the United States, Europe, Japan, and Korea. The most essential component in such a hybrid vehicle or electric vehicle is a battery pack that provides driving force to a vehicle motor.

Most battery packs, particularly medium-to-large-sized battery packs such as hybrid vehicles, electric vehicles, and energy storage systems (ESS), include one or more battery modules, and these battery modules include a plurality of secondary batteries. In addition, the plurality of secondary batteries are connected in series and/or parallel to each other in the battery module, so that capacity and output are improved. In particular, a pouch-type secondary battery is widely used in a medium-to-large device due to the advantage of easy stacking.

On the other hand, the conventional battery module has a structure in which the battery cells are stacked to form a battery cell stack, the battery cell stack is mounted on the lower case, and then the upper case is coupled to the lower case.

However, in this case, there is a problem in that the case must be used separately according to the number of battery cells constituting the battery cell stack.

Korean Patent Publication No. 2018-0100748

An object of the present invention is to provide a battery module including a hydraulic cylinder capable of supporting the battery cell stack by pressing one surface of the battery cell stack in order to solve the problems of the prior art as described above. In addition, an object of the present invention is to provide an apparatus for evaluating a battery pack and a secondary battery including the battery module.

The present invention relates to a battery module (BATTERY MODULE), in one example, a battery cell stack in which n battery cells are stacked (n is an integer of 2 or more); a housing having an open structure on one side and accommodating the battery cell stack therein; and a folding jig accommodated in the housing, one side supporting the battery cell stack, and the other side supporting the side wall of the housing, the folding jig including a hydraulic cylinder for controlling the distance between the battery cell stack and the side wall of the housing do.

In one example, the folding jig, the main plate for supporting one surface of the battery cell stack; and a base plate disposed to face the main plate and supporting an inner sidewall of the housing.

In another example, the folding jig, but mechanically fastens the main plate and the base plate, has a structure including two support bars that are rotatable based on a hinge axis and cross each other.

At this time, one end of the hydraulic cylinder is fastened to one of the two support bars, and is fastened to the support bar adjacent to the main plate, and the other end of the hydraulic cylinder is fastened to the base plate or the side wall of the housing, and the hydraulic cylinder is , by extending or contracting the length between one end and the other end, it may be a structure to control the distance between the battery cell stack and the side wall of the housing.

In one example, the battery cell stack has a structure in which n battery cells are stacked in a vertical direction with respect to the open surface of the housing. In addition, the battery module may include two folding jigs to support both sides of the battery cell stack accommodated in the housing.

In one example, a cover coupled to the housing to cover one surface of the housing is further included.

In addition, the present invention in one example, the battery module, the electrode leads of each of the n number of battery cells are inserted, but having a plurality of insertion slits, but a lead connecting member made of a conductive material; and a bus bar or insulating bar that electrically connects or insulates adjacent electrode leads to each other by filling an empty space between the electrode lead inserted into the insertion slit and the inner wall surface of the insertion slit.

In one example, in the battery module according to the present invention, the bus bar inserted into the k-th insertion slit and the bus bar inserted into the k+1-th insertion slit (k is an integer between 1 or more and n-1) are in opposite directions. The n battery cells have a structure in which the first electrode lead and the second electrode lead are alternately arranged based on the stacking direction.

In a specific example, the upper portion of the bus bar inserted into the k+1th insertion slit is in contact with the first electrode lead of the battery cell accommodated at the k+1th, and the lower portion of the busbar inserted into the k+1th insertion slit is k It has a structure in contact with the second electrode lead of the battery cell to be accommodated.

In another example, the bus bar is accommodated in the insertion slit of the lead connecting member, and the first electrode lead of the k-th battery cell and the k+1-th first electrode lead are positioned in the same direction.

In a specific example, the upper and lower portions of the bus bar positioned at one end of the k+1-th battery cell are in contact with the first electrode lead of the k+1-th battery cell and the first electrode lead of the k-th battery cell accommodated, respectively, , the upper and lower portions of the bus bar positioned at the other end of the k+1-th battery cell are in contact with the second electrode lead of the k+1-th battery cell and the second electrode lead of the k-th battery cell accommodated, respectively.

In addition, the present invention provides a battery pack including the battery module described above.

Furthermore, the present invention provides a secondary battery evaluation device including the battery module described above. In one example, the secondary battery evaluation device may include: a charging/discharging behavior of a battery cell according to temperature; And evaluate any one or more of the temperature behavior according to the charging and discharging of the battery cell.

A battery module according to the present invention, a battery pack including the same, and a secondary battery evaluation device including the same include a hydraulic cylinder for controlling a distance between a battery cell stack and a sidewall of the housing inside a housing in which the battery cell stack is accommodated, , the battery cell stack can be easily supported regardless of the number of battery cells accommodated, and temperature behavior or performance evaluation of the secondary battery module can be easily performed.

1 to 2 are perspective views of a battery module according to an embodiment of the present invention.
3 is a partially enlarged view of a folding jig of a battery module and a corresponding thereto according to an embodiment of the present invention.
4 is a view showing an assembly process of a battery module according to an embodiment of the present invention.
5 to 7 are perspective views of a battery module according to an embodiment of the present invention.
8 to 9 are views showing the electrical connection relationship of the battery cells accommodated in the battery module of the present invention.

Since the present invention can have various changes and can have various forms, specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the present invention to the specific disclosed form, it should be understood to include all modifications, equivalents and substitutes included in the spirit and scope of the present invention.

In the present application, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It is to be understood that it does not preclude the possibility of the presence or addition of numbers, steps, operations, components, parts, or combinations thereof. Also, when a part of a layer, film, region, plate, etc. is said to be "on" another part, this includes not only the case where it is "directly on" another part, but also the case where another part is in the middle. Conversely, when a part of a layer, film, region, plate, etc. is said to be “under” another part, this includes not only cases where it is “directly under” another part, but also cases where another part is in between. In addition, in the present application, “on” may include the case of being disposed not only on the upper part but also on the lower part.

The present invention relates to a battery module. In one example, the battery module according to the present invention includes a battery cell stack in which n battery cells are stacked (n is an integer of 2 or more); a housing having an open structure on one side and accommodating the battery cell stack therein; and a folding jig accommodated in the housing, one side supporting the battery cell stack, and the other side supporting the side wall of the housing, the folding jig including a hydraulic cylinder for controlling the distance between the battery cell stack and the side wall of the housing do.

In general, a battery module has a structure in which a battery cell stack is formed by stacking battery cells, and the battery cell stack is mounted on a lower case and then the upper case is coupled to the lower case. However, in this case, there is a problem in that a case must be used separately according to the number of battery cells constituting the battery cell stack.

Accordingly, the present invention provides a battery module including a hydraulic cylinder capable of supporting the battery cell stack by pressing one surface of the battery cell stack, and a battery pack including the same. The battery module according to the present invention includes a hydraulic cylinder for controlling the distance between the battery cell stack and the sidewall of the housing inside the housing in which the battery cell stack is accommodated, so that the battery cell stack can be easily accommodated regardless of the number of battery cells accommodated. can strongly support Furthermore, the present invention provides a secondary battery evaluation apparatus including the above-described battery module, which can easily perform temperature behavior or performance evaluation.

Hereinafter, a battery module including a hydraulic cylinder according to the present invention, a battery pack including the same, and a secondary battery evaluation apparatus including the same will be described in detail with reference to FIGS. 1 to 9 . In describing each figure, like reference numerals have been used for like elements. In the accompanying drawings, the dimensions of the structures are enlarged than the actual size for clarity of the present invention. Terms such as first, second, etc. may be used to describe various elements, but the elements should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The singular expression includes the plural expression unless the context clearly dictates otherwise.

1 to 2 are perspective views of a battery module according to an embodiment of the present invention.

1 to 2, the battery module 100 according to an embodiment of the present invention includes a battery cell stack 110, a housing 120 accommodating the battery cell stack 110, and It is accommodated in the housing 120 and includes a folding jig 130 for supporting the battery cell stack 110 . At this time, one side of the folding jig 130 supports the battery cell stack 110 , and the other side supports the side wall of the housing 120 , but between the battery cell stack 110 and the side wall of the housing 120 . It is characterized in that it comprises a hydraulic cylinder 131 to control the distance of. On the other hand, the folding jig 130 may refer to a hinge-coupled folding type jig or support.

In one example, the battery cell stack 110 has a structure in which n (n is an integer greater than or equal to 2) battery cells 10 are stacked. The stacked number n of the battery cells 10 may vary depending on the number of battery cells 10 that require electrical connection, or may vary depending on the capacity of the battery module. For example, the battery cell stack number (n) of the battery cell stack 110 is in the range of 2-100, 2-50, 2-10, or 3-7.

Meanwhile, the battery cell 10 is not particularly limited as long as it is a rechargeable battery capable of charging and discharging.

In a specific example, each battery cell 10 constituting the battery cell stack 110 is a pouch-type unit cell, and an electrode assembly having a positive electrode/separator/negative electrode structure on a laminate sheet exterior material is formed outside the exterior material. It is built in connected to the electrode leads 11 and 12 . The electrode leads 11 and 12 may be drawn out of the sheet and extend in the same or opposite directions.

In the drawings of the present invention, only the pouch-type battery cell 10 having a shape in which a pair of electrode leads 11 and 12 are drawn out in opposite directions is shown in the drawings for convenience of illustration, but the battery module 100 according to the present invention ) applied to the battery cell 10 is not necessarily limited thereto, and a case in which a pair of electrode leads 11 and 12 are drawn out in the same direction is also possible.

In one example, each battery cell constituting the battery cell stack 110 is electrically connected by a lead connecting member 111 on which a bus bar 1112 or an insulating bar 1112 ′ is disposed. In a specific example, in the battery module 100 according to the present invention, electrode leads 11 and 12 of each of the n battery cells 10 are inserted, and a plurality of insertion slits 1111 are provided, but lead connection made of a conductive material. By filling the empty space between the electrode leads 11 and 12 inserted into the member 111 and the insertion slit 1111 and the inner wall surface of the insertion slit 1111, the electrode leads 11 and 12 adjacent to each other are electrically connected Alternatively, an insulating bus bar 1112 or an insulating bar 1112 ′ is included. In particular, depending on the arrangement position of the bus bar 1112 and the insulating bar 1112', the electric cell stack 110 may be electrically connected in series or in parallel.

The lead connecting member 111 and the bus bar 1112 may be made of an electrically conductive metal material having a relatively high electrical conductivity. For example, the lead connecting member 111 and the bus bar 1112 may include one or more electrically conductive materials selected from nickel, copper, aluminum, lead, and tin. For example, the lead connecting member 111 and the bus bar 1112 may be made of a copper material. However, the present invention is not necessarily limited thereto, and in addition, various metals may be used as the material of the lead connecting member 111 and the bus bar 1112 .

In addition, the insulating bar 1112 ′ is for blocking the electrical connection between the battery cells 10 , and may be formed of an insulating material. For example, the insulating bar is formed of various polymer resins having electrical insulating properties, or has a structure in which a polymer resin is coated on the surface of the metal bar.

In another example, the bus bar 1112 or the insulating bar 1112 ′ contacts the electrode leads 11 and 12 accommodated in the battery cell 10 , and at the same time a slit of the lead connecting member 111 . (1111) is in contact with the structure. In the above structure, when the bus bar 1112 is accommodated, the positive electrode leads 11 and 12 are electrically connected between the battery cell 10 and the battery cell 10 stacked on the upper or lower portion. Conversely, when the insulating bar 1112 ′ is accommodated, the electrical connection between the both electrode leads 11 and 12 is blocked. A detailed electrical arrangement will be described later.

In one example, the battery module 100 according to the present invention includes a housing 120 having an open structure. The housing 120 means a case for accommodating the battery cell stack 110 , and the housing 120 includes a storage space in which the battery cell stack 110 is accommodated.

In another example, the cover 140 is coupled to the housing 120 to cover one surface of the housing 120 . The housing 120 and the cover 140 may be coupled to each other by, for example, bolting to each other. And, in order to increase the airtightness therebetween, a sealing member may be further interposed in a portion where the housing 120 and the cover 140 contact each other. In this case, the sealing member may be made of synthetic rubber, polyurethane, etc. having excellent flame resistance.

The cover 140 may be manufactured in the form of a plate-shaped structure having an area sufficient to cover the open surface of the housing 120 . In addition, a plurality of bolt insertion holes may be provided at an edge of the cover 140 , and a plurality of bolt insertion holes may be provided at an edge of an open surface of the housing.

The battery cell stack 110 may be accommodated in the housing 120 . In one example, the battery cell stack 110 has a structure in which n battery cells 10 are stacked in a horizontal direction with respect to the open surface of the housing 120 .

In another example, the battery cell stack 110 has a structure in which n battery cells 10 are stacked in a vertical direction with respect to the open surface of the housing 120 .

3 is a partially enlarged view of a folding jig of a battery module and a corresponding thereto according to an embodiment of the present invention.

As shown in FIG. 3 , the battery module 100 according to the present invention is, in one example, a folding jig 130 that can easily support and press the battery cell stack 110 inside the housing 120 . ) is included.

In a specific example, the folding jig 130 includes a hydraulic cylinder 131 to control the distance between the battery cell stack 110 and the sidewall of the housing 120 to control the distance between the battery cell stack 110 and the housing 120 . can be easily supported. In particular, one side of the hydraulic cylinder 131 supports the battery cell stack 110 , and the other side of the hydraulic cylinder 131 supports the sidewall of the housing 120 .

In one example, the folding jig 130 is disposed to face the main plate 132 and the main plate 132 supporting one surface of the battery cell stack 110 , and supports the inner sidewall of the housing 120 . It is a structure including one or more of the base plate (133). The base plate 133 may have a plate shape or a frame shape. It may be a structure for easily fastening a support bar, which will be described later. The main plate 132 and the base plate 133 may be made of an insulating material. The main plate 132 and the base plate 133 may be made of an electrically insulating plastic material. Through this, the safety of the operator handling the battery module 100 is ensured.

In a specific example, the folding jig 130 mechanically fastens the main plate 132 and the base plate 133, rotatable based on the hinge axis and intersecting two support bars 134 and 134'. structure that contains

For example, the first support bar 134 is fastened to one side of the main plate 132 and the base plate 133 , respectively, and the second support bar 134 ′ is the main plate 132 and the base plate 133 . It is a structure that is fastened to each other on the other side. Through this, the folding jig 130 is mechanically fastened to the main plate 132 and the base plate 133 , and according to the folding or unfolding structure of the folding jig 130 , the main plate 132 and the base plate 133 are changed. ) is controlled.

In another embodiment, one end of the hydraulic cylinder 131 is fastened to one of the two support bars 134 and 134', the main plate 132 and the adjacent support bars 134 and 134'. Fastened, the other end of the hydraulic cylinder 131 is fastened to the side wall of the base plate 133 or the housing 120, the hydraulic cylinder 131, by extending or contracting the length between the one end and the other end of the battery This structure controls the distance between the cell stack 110 and the sidewall of the housing 120 . For example, when the length between one end and the other end of the hydraulic cylinder 131 is extended, the battery cell stack 110 is supported. That is, by adjusting the length of the hydraulic cylinder 131 to fit the inner width of the housing 120 that varies depending on the number of battery cells 10 , the battery cell stack 110 may be supported by pressing.

In addition, in the side surfaces of the main plate 132 and the base plate 133 , preferably, in the region where the support bars 1341 and 1341 ′ are connected to the main plate 132 and the base plate 133 , there is a support fastening groove 1321 . , 1331) is formed. Accordingly, one end of the folding jig 130 may be inserted and fastened to the support fastening grooves 1321 and 1331 . The support fastening grooves 1321 and 1331 are formed as bead-shaped grooves having a long length in the horizontal direction. It has secured a space for movement.

On the other hand, in one example, the battery module 100 according to the present invention includes a single folding jig (130). In this case, the folding jig 130 may support one surface of the battery cell stack 110 .

In another example, the battery module 100 according to the present invention includes two folding jigs 130 . The two folding jigs 130 may support both sides of the battery cell stack 110 inside the housing 120 , respectively. In this case, the structural stability of the battery module 100 may be increased.

4 is a view showing an assembly process of a battery module according to an embodiment of the present invention.

Hereinafter, an assembly process of a battery module according to an embodiment of the present invention will be described with reference to FIG. 4 .

First, the housing 120 with one side open is prepared, and the folding jig 130 is accommodated in the housing 120 . In this case, the folding jig 130 may be disposed on both sides of the inner wall of the housing 120 , but is not limited thereto.

Then, by assembling n battery cells 10 (n is an integer of 2 or more), the battery cell stack 110 is formed, and for electrical connection of each battery cell 10, the lead connecting member 111 is The electrode leads 11 and 12 are inserted. At this time, the electrical connection of the battery cells 10 to the lead connecting member 111 may be connected in series or in parallel, which is an arrangement of the bus bar 1112 or the insulating bar 1112 ′ inserted into the lead connecting member 111 . can be set accordingly.

In one example, the battery cell stack 110 of the present invention provides a plurality of battery cells 10 in a structure electrically connected to each other in series (n is an integer of 2 or more). Specifically, a bus bar 1112 is disposed on one side of each battery cell 10 , and an insulating bar 1112 ′ is disposed on the other side of each battery cell 10 . At this time, the bus bar 1112 inserted into the k-th battery cell 10 and the bus bar 1112 inserted into the k+1-th battery cell 10 (k is an integer between 1 or more and n-1) are mutually exclusive. It can be located in the opposite direction. In this case, in the n battery cells 10 , the first electrode leads 11 and the second electrode leads 12 are alternately arranged based on the stacking direction. In a specific example, the upper portion of the bus bar 1112 accommodated in the k+1th of the electrode connection member 111 is in contact with the first electrode lead 11 of the battery cell 10 accommodated in the k+1th, k+ A lower portion of the bus bar 1112 accommodated in the first may be in contact with the second electrode lead 12 of the battery cell 10 accommodated in the k-th.

For example, the k+1-th inserted bus bar 1112 is electrically connected to the first electrode lead 11 of the battery cell 10 accommodated in the k+1-th and the second electrode lead 12 accommodated in the k-th. The bus bar 1112 accommodated in the k-th is electrically connected to the first electrode lead 11 of the battery cell 10 accommodated in the k-th and the second electrode lead 12 accommodated in the k-th.

In another example, the n stacked battery cells 10 of the present invention are provided in a structure electrically connected to each other in parallel.

The bus bar 1112 is accommodated in the insertion slit 1111 of the lead connecting member 111 .

At this time, the first electrode lead 11 of the battery cell 10 accommodated in the k-th and the first electrode lead 12 accommodated in the k+1 are located in the same direction.

In a specific example, the upper and lower portions of the bus bar 1112 accommodated in the k+1-th in the lead connecting member 111 are the first electrode lead 11 and the k-th of the battery cell 10 accommodated in the k+1-th, respectively. Contacting the first electrode lead 11 of the battery cell 10 accommodated, the upper and lower portions of the bus bar 1112 accommodated in the k+1th are the second of the battery cell 10 accommodated in the k+1th, respectively. It is in contact with the electrode lead 12 and the second electrode lead 12 of the battery cell 10 accommodated in the k-th.

Accordingly, the bus bar 1112 may electrically connect the k+1-th accommodated first electrode lead 11 and the k-th accommodated first electrode lead 11 . For example, the k+1-th inserted bus bar 1112 electrically connects the first electrode lead 11 of the battery cell 10 accommodated in the k+1-th and the first electrode lead 11 accommodated in the k-th. The bus bar 1112 accommodated in the k-th can be electrically connected to the first electrode lead 11 of the battery cell 10 accommodated in the k-th and the first electrode lead 11 accommodated in the k-1 th. (Fig. 4a).

Next, the battery cell stack 110 is accommodated in the housing 120 , and the folding jig 130 is spread to fit the width of the battery cell stack 110 . That is, by extending the length of the hydraulic cylinder 131 so that the folding jig 130 can support one surface of the battery cell stack 110 , the battery cell stack 110 and the sidewall of the housing 120 . Control the distance. And, for airtightness between the housing 120 and the cover 140, the sealing member 141 is interposed in the area where the housing 120 and the cover contact each other (FIG. 4b).

Then, the cover 140 is assembled to cover the open surface of the housing 120 . At this time, it is fastened to the bolt insertion holes 122 and 142 of the housing 120 and the cover 140 with the bolt fastening part 150 ( FIGS. 4C and 4D ).

As described above, the battery module 100 according to one embodiment of the present invention is between the battery cell stack 110 and the sidewall of the housing 120 inside the housing 120 in which the battery cell stack 110 is accommodated. By using the hydraulic cylinder 131 to control the distance of the battery cell stack 110 can be easily pressed and supported regardless of the number of battery cells 10 accommodated.

In addition, the present invention provides a battery pack including the battery module described above.

In a specific example, the present invention provides a battery pack in which one or two or more of the battery modules are combined.

The battery pack is applicable to various types of energy storage devices or power sources. For example, the energy storage device is an Energy Storage System (ESS) that stores a large amount of electrical energy. In addition, the power source is applicable as a power source of a moving means, for example, a vehicle. The automobile refers to various types of automobiles using secondary batteries as an auxiliary power source or a main power source. Specifically, the vehicle includes a hybrid (HEV), a plug-in hybrid (PHEV), or a pure electric vehicle (BEV, EV) or the like.

In addition, the present invention provides a secondary battery evaluation apparatus including the battery module described above. In this case, the battery cell accommodated in the battery module is a secondary battery, for example, a lithium secondary battery.

In one example, it further includes a charging/discharging unit electrically connected to the battery cell accommodated in the battery module. The charging/discharging unit may supply charging power to the secondary battery or receive discharging power from the secondary battery. Here, supplying the charging power to the secondary battery is not necessarily limited to the meaning of supplying sufficient power to the extent to buffer the secondary battery. Supplying charging power to the secondary battery may be used as supplying power sufficient to measure the voltage of the first electrode lead, the second electrode lead, etc. for performance evaluation of the secondary battery. Since the meaning of receiving discharge power from the secondary battery can be used similarly, repeated descriptions will be omitted.

In one embodiment, the secondary battery evaluation device, the charging and discharging behavior of the battery cell according to the temperature; And evaluate any one or more of the temperature behavior according to the charging and discharging of the battery cell. Performance evaluation of the battery cells may be performed in a state in which the charging/discharging process for the stacked battery cells to be evaluated is repeated. In addition, charging and discharging of the battery cell may be repeated, and in this case, the temperature behavior of the battery cell may be evaluated.

Hereinafter, various forms of the battery module according to the present invention will be described with reference to the drawings.

(First embodiment)

5 is a perspective view of a battery module according to an embodiment of the present invention.

5, the battery module 100 according to one embodiment is a battery cell stack 110 (n is an integer of 2 or more) in which n battery cells 10 are stacked, one side of which is an open structure, The housing 120 for accommodating the battery cell stack 110 therein and the housing 120 are accommodated therein, and one side supports the battery cell stack 110 , and the other side supports the sidewall of the housing 120 . However, a folding jig 130 including a hydraulic cylinder 131 for controlling the distance between the battery cell stack 110 and the sidewall of the housing 120 is included.

In this case, the battery cell stack 110 has a structure in which the battery cells 10 are stacked in a vertical direction with respect to the open surface of the housing 120 .

In addition, the battery module 100 according to the present invention includes two folding jigs 130 . The two folding jigs 130 are arranged on both sides of the battery cell stack 110 with respect to the battery cell stack 110 . In this case, the two folding jigs 130 may support both sides of the battery cell stack 110 inside the housing 120 , respectively. In a specific example, one surface of one folding jig 130 supports one surface of the battery cell stack 110 , and the other surface of the folding jig 130 supports one side wall inside the housing 120 . In addition, one surface of the other folding jig 130 supports the other surface of the battery cell stack 110 , and the other surface of the folding jig 130 supports the other side wall inside the housing.

(Second embodiment)

6 is a perspective view of a battery module according to an embodiment of the present invention.

6, the battery module 200 according to one embodiment is a battery cell stack 210 (n is an integer greater than or equal to 2) in which n battery cells 20 are stacked, one side of which is an open structure, The housing 220 accommodating the battery cell stack 210 therein and the housing 220 are accommodated therein, and one side supports the battery cell stack 210 , and the other side supports the sidewall of the housing 220 . However, a folding jig 230 including a hydraulic cylinder 231 for controlling the distance between the battery cell stack 210 and the sidewall of the housing 220 is included.

In this case, the battery cell stack 210 has a structure in which the battery cells 20 are stacked in a vertical direction with respect to the open surface of the housing 220 .

In addition, the battery module 200 according to the present invention includes a single folding jig (230). In this case, the two folding jigs 230 may support one surface of the battery cell stack 210 inside the housing 220 . In a specific example, one surface of one folding jig 230 supports one surface of the battery cell stack 210 , and the other surface of the folding jig 230 supports one side wall inside the housing 220 .

(Third embodiment)

7 is a perspective view of a battery module according to an embodiment of the present invention.

7, the battery module 300 according to one embodiment is a battery cell stack 310 (n is an integer greater than or equal to 2) in which n battery cells 30 are stacked, one side of which is an open structure, The housing 320 for accommodating the battery cell stack 310 therein and the housing 320 are accommodated therein, and one side supports the battery cell stack 310 , and the other side supports the sidewall of the housing 320 . However, a folding jig 330 including a hydraulic cylinder 331 for controlling the distance between the battery cell stack 310 and the sidewall of the housing 320 is included.

In this case, the battery cell stack 310 has a structure in which the battery cells 30 are stacked in a horizontal direction with respect to the open surface of the housing 320 .

In this case, one surface of the battery cell stack 310 is seated on the bottom surface inside the housing 320, and the other surface of the battery cell stack 310 is in contact with one surface of the folding jig 330, and the folding jig ( 330), the battery cell stack 310 may be pressurized.

(Fourth embodiment)

8 is a view showing an electrical connection relationship between the battery cells accommodated in the battery module of the present invention.

Referring to FIG. 8 , each battery cell is stacked so that the positive electrode and the negative electrode cross each other in a vertical direction. Specifically, based on the battery cell stacked on the top, the first electrode lead (+) is in contact with the lower bus bar, and the second electrode lead (-) is in contact with the lower insulating bar. The bus bar in contact with the first electrode lead (+) of the battery cell stacked on the top contacts the second electrode lead (-) of the second battery cell stacked below, and electrically connects the two. In contrast, the insulating bar in contact with the second electrode lead (-) of the battery cell stacked on the top contacts the first electrode lead (+) of the second battery cell stacked below, but electrically cuts off the two. . This stacked structure electrically connects the stacked battery cells in series.

(fifth embodiment)

9 is a view showing an electrical connection relationship between the battery cells accommodated in the battery module of the present invention.

Referring to FIG. 9 , each battery cell is stacked so that the positive electrode and the negative electrode are oriented in the same direction. Specifically, first electrode leads (+) protrude from the left side of the stacked battery cells, and the first electrode leads (+) are electrically connected by intervening bus bars. In addition, second electrode leads (-) protrude from the right side of the stacked battery cells, and the second electrode leads (-) are electrically connected by intervening bus bars. This stacked structure electrically connects the stacked battery cells in parallel.

In the above, preferred embodiments of the present invention have been described with reference to the drawings, but those skilled in the art or those having ordinary skill in the art will not depart from the spirit and scope of the present invention described in the claims. It will be understood that various modifications and variations of the present invention can be made without departing from the scope of the present invention.

Accordingly, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification, but should be defined by the claims.

10, 20, 30: battery cell
11: first electrode lead
12: second electrode lead
100, 200, 300: battery module
110, 210, 310: battery cell stack
111, 211, 311: lead connecting member
1111: slit
1112: bus bar
1112': Insulation bar
120, 220, 320: housing
122: fastening hole
130, 230, 330: folding jig
131, 231, 313: hydraulic cylinder
132: main plate
1321: support fastening groove
133: base plate
1331: support fastening groove
134, 134': Jijiba
140: cover
141: sealing member
142: fastening hole
150: bolted part

Claims (14)

a battery cell stack in which n battery cells are stacked (n is an integer of 2 or more);
a housing having an open structure on one side and accommodating the battery cell stack therein; and
Accommodated in the housing, one side supports the battery cell stack, the other side supports the side wall of the housing, but comprising a folding jig comprising a hydraulic cylinder for controlling the distance between the battery cell stack and the side wall of the housing battery module.
The method of claim 1,
The folding jig includes: a main plate supporting one surface of the battery cell stack; and
The battery module is disposed to face the main plate and has a structure including at least one of the base plates supporting the inner sidewall of the housing.
3. The method of claim 2,
The folding jig mechanically fastens the main plate and the base plate,
A battery module having a structure including two support bars that are rotatable based on a hinge axis and cross each other.
4. The method of claim 3,
One end of the hydraulic cylinder is fastened to one support bar among the two support bars, and is fastened to the support bar adjacent to the main plate,
The other end of the hydraulic cylinder is engaged with the side wall of the base plate or housing,
The hydraulic cylinder is a battery module having a structure that controls the distance between the battery cell stack and the side wall of the housing by extending or contracting the length between the one end and the other end.
The method of claim 1,
The battery cell stack is a battery module having a structure in which n battery cells are stacked in a vertical direction with respect to an open surface of a housing.
The method of claim 1,
A battery module having a structure including two folding jigs to support both sides of a battery module and a battery cell stack accommodated in a housing.
The method of claim 1,
The battery module further comprising a cover coupled to the housing to cover one surface of the housing.
The method of claim 1,
The battery module includes: a lead connecting member into which electrode leads of each of the n battery cells are inserted, a plurality of insertion slits, and a lead connecting member made of a conductive material; and
A battery module including a bus bar or insulating bar that electrically connects or insulates adjacent electrode leads by filling an empty space between the electrode lead inserted into the insertion slit and the inner wall surface of the insertion slit.
9. The method of claim 8,
The bus bar inserted into the kth insertion slit and the busbar inserted into the k+1th insertion slit (k is an integer between 1 and n-1) are located in opposite directions,
The n battery cells are a battery module in which the first electrode lead and the second electrode lead are alternately arranged based on the stacking direction.
10. The method of claim 9,
The upper portion of the bus bar inserted into the k+1-th insertion slit is in contact with the first electrode lead of the k+1-th battery cell accommodated,
A battery module having a structure in which a lower portion of the bus bar inserted into the k+1-th insertion slit contacts the second electrode lead of the k-th battery cell accommodated.
9. The method of claim 8,
A battery module having a structure in which a bus bar is accommodated in the insertion slit of the lead connecting member, and the first electrode lead of the k-th battery cell and the k+1-th first electrode lead are positioned in the same direction.
12. The method of claim 11,
The upper and lower portions of the bus bar positioned at one end of the k+1-th battery cell are in contact with the first electrode lead of the k+1-th battery cell and the first electrode lead of the k-th battery cell accommodated, respectively,
The upper and lower portions of the bus bar located at the other end of the k+1-th battery cell are each in contact with the second electrode lead of the k+1-th battery cell and the second electrode lead of the k-th battery cell accommodated in the battery module. .
A battery pack comprising the battery module according to claim 1 .
A secondary battery evaluation device comprising the battery module according to claim 1 .

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