KR102523610B1 - Battery pack and method for fabricating the same - Google Patents

Abstract

Disclosed herein is a battery pack that can be manufactured in a compact size and with improved storage convenience of cells stored therein, and a manufacturing method thereof.
According to one embodiment of the disclosure in this specification, a battery pack includes a case, a cell disposed inside the case, a sheet attached to the cell to fix the position of the cell, and coupled to the case and electrically connected to the cell. A molding part formed to be coupled to the cell and the sheet by being injected and hardened into the connected BMS and the inside of the case.

Description

Battery pack and its manufacturing method {BATTERY PACK AND METHOD FOR FABRICATING THE SAME}

The content disclosed in this specification relates to a battery pack that stores and supplies power.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and it is not admitted that the material described in this section is prior art.

In general, since the cartridge of a battery pack must be manufactured according to the battery pack, the purpose of use, or the space to which it is attached, high manufacturing costs such as mold manufacturing are incurred.

In addition, a separate space is required because a coupling structure such as bolting is required to connect the cartridge to the case of the battery pack, and since the cartridge material covers only a part of the battery cell, it is vulnerable to fire, shock and waterproofing. There are downsides.

In this regard, Korean Patent Publication No. 10-2020-0025719 discloses a cooling structure of a battery pack for a cylindrical battery equipped with a cooling fin, and Korean Patent Registration No. 10-1962858 discloses a non-welding cylindrical battery pack device. are doing

However, existing inventions do not disclose technology for improving convenience and safety in the battery pack manufacturing process.

An object of the present invention is to provide a battery pack that improves the storage convenience of cells stored therein, can be manufactured in a compact size, and improves safety at the same time, and a manufacturing method thereof.

In addition, it is not limited to the technical problems as described above, and it is obvious that other technical problems may be derived from the following description.

According to one embodiment of the disclosed subject matter, a battery pack includes a case, a cell disposed inside the case, a sheet attached to the cell to fix the position of the cell, and a BMS coupled to the case and electrically connected to the cell. and a molding portion formed to be coupled to the cell and the sheet by being injected into the case and cured.

In addition, a plurality of cells may be disposed in the case, and the cells may be accommodated in the case such that electrodes formed in the same direction are arranged in a lattice form.

In addition, the sheet may have grooves formed adjacent to the openings of the spaces corresponding to the cells.

In addition, the case may include a blocking plate formed in a plate shape and disposed between the cell and the BMS to partition the inner space of the case into first and second spaces in which the cell and the BMS are accommodated, respectively. .

A method for manufacturing a battery pack including a case in which an opening is formed, a cell disposed inside the case, and a BMS connected to the cell includes a cell accommodating step of arranging the cell inside the case, and placing the BMS inside the case. It includes a BMS storage step of arranging and an injection step of injecting a molding material into the case.

In addition, the cylindrical or polymer-shaped cells may be disposed in the case, and the cells may be accommodated in the case such that electrodes formed in the same direction are disposed in a lattice form.

In addition, in the cell accommodating step, a sheet in which a groove connected to a space corresponding to a plurality of cells is formed may be stored in the case while being coupled to the cells.

According to one embodiment disclosed herein, the battery pack has the advantage of stably fixing the cells to the inside of the case and manufacturing in a compact size by injecting the liquefied molding into the inside of the case in which the cells are accommodated without a separate cartridge. .

In addition, the battery pack has an advantage of improving dustproof, waterproof, dripproof, fireproof, fire-transition, and shockproof functions between the cells as the molded part is introduced between the cells in the process of being injected into the case.

In addition, the protrusions formed on the side of the molding part engage with the inner protrusions inside the case to improve the durability of the molding part, and the case and the cells can be sealed without a separate sealing process.

In addition, since the effects of the present invention described as described above are naturally exhibited by the configuration of the described contents regardless of whether the inventor recognizes them, the above-described effects are only a few effects according to the described contents, and all the effects that the inventor grasps or realizes should not be accepted as written.

In addition, the effect of the present invention should be additionally grasped by the overall description of the specification, and even if it is not described in an explicit sentence, those skilled in the art to which the described contents belong will have such an effect through this specification. If the effect can be recognized as such, it should be regarded as the effect described in this specification.

1 is a perspective view of a battery pack according to an embodiment of the present specification;
2 and 3 are exploded perspective views of the battery pack of FIG. 1;
4 is a perspective view of the molding part of FIG. 1 viewed from another angle;
5 is a cross-sectional view of the battery pack taken along line II′ of FIG. 1;
6 is a flowchart illustrating a method of manufacturing the battery pack of FIG. 1;

Hereinafter, operations and effects of a battery pack and a manufacturing method thereof according to a preferred embodiment will be described with reference to the accompanying drawings. For reference, in the following drawings, each component is omitted or schematically illustrated for convenience and clarity, the size of each component does not reflect the actual size, and the same reference numerals refer to the same components throughout the specification. , and reference numerals for the same components in the individual drawings will be omitted.

1 to 5, the battery pack 100 includes a case 200, a blocking plate 210, a cover 250, a cell 300, first side connectors 310, and a second side surface. Connectors 320, first sheet 340, second sheet 360, BMS 400, first connector 410, second connector 420, sensor unit 430, connection terminal 440 and a molding unit 500 .

Unlike conventional battery packs composed of a cartridge (polymer) holding battery cells and a BMS attached thereto, the battery pack 100 is a thin, low-cost sheet holding battery cells and the cells and sheets are placed inside the case. It is composed of a molding material that is fixed and has the advantage of not requiring a separate cartridge.

In addition, since the battery pack 100 is disposed in a state where the BMS and the cells are separated from each other, it is unnecessary to remove the molding material when a problem with the BMS occurs, improving maintainability, high elasticity and shock absorption, and sealing the cells. The dustproof, waterproof, dripproof, fireproof, fire-transfer and shockproof functions of the battery pack 100 are improved by the molding material.

The case 200 is formed in the form of a square container in which the first and second spaces 1 and 2 separated from each other are opened upward and extended forward or rearward, and the first and second spaces 1 and 2 are formed on one side and the other inner side of the inside. and inner protrusions 220 protruding toward the second spaces 1 and 2 are formed.

Each of the inner protrusions 220 have portions spaced apart from the inner surface of the case 200 by the same distance in the front and rear directions and contracted and extended toward the first and second spaces 1 and 2, so that the cross section is an isosceles trapezoid, and the top or It is formed in the form of a column extending toward the bottom.

The blocking plate 210 is formed in the form of a vertical plate extending upward or downward, and both sides of the rim are detachably coupled to the inner surface of the case 200 from the front of the first space 1 so that the first space ( 1) and the second space 2 are separated from each other.

The first space 1 is formed in the form of a hexahedron that extends from the rear of the second space 2 toward the front or rear relative to the second space 2, and is single or plural inside the first space 1. of cells 300 are disposed, and when a single cell 300 is disposed, the size of the first space 1 may be smaller than that of the second space 2.

The cover 250 is formed in the form of a horizontal plate that extends forward or backward and is horizontal to the ground, and is detachably or attachably coupled to the top of the case 200 through the upper holder 550, and the first and second The spaces 1 and 2 are sealed.

The cells 300 are formed in a cylindrical shape in which the anode and the cathode are disposed toward one side or the other side, and the outer surfaces of each of the cells 300 are disposed while being in close contact with each other, and one or the other side of the cells 300 in a stacked state. When looking at the electrodes disposed on from the side, the electrodes are disposed in a triangular lattice form.

The cells 300 are stacked in the first space 1 and electrically connected to each other by first and second side connectors 310 and 320 before being arranged, and the first and second side connectors 310 and 320 It is coupled to the first and second side connectors 310 and 320 while maintaining a block shape through the first sheet 340 and the second sheet 360 respectively coupled to one side and the other side of them.

The cells 300 may be accommodated in the first space 1 such that electrodes corresponding to the anode and the cathode are respectively disposed on the top and bottom, and when the electrodes of the cells 300 face the top and bottom, the molding unit 500 ) is injected into the case 200, a part of the molding part 500 is effectively introduced into the spaces formed between the cells 300.

As shown in FIG. 5, a single cell unit is composed of three stacked first to third cells 331, 332, and 333 vertically on the same vertical line and on the same vertical line at a position corresponding to the relatively forward side. It consists of two fourth and fifth cells 334 and 335 that are stacked two vertically and arranged on a horizontal line different from the first to third cells 331, 332, and 333 at the rear.

The plurality of cell units are disposed in close contact with each other toward the front or rear in the first space 1 so that side electrodes are arranged in a triangular lattice shape, and the first to fifth cells 331, 332, 333, 334, and 335 The molding part 500 is injected into the first to fourth injection spaces 336, 337, 338, and 339 formed between the cell units composed of cells.

The first cell 331 is disposed below on a vertical line corresponding to the rear of the cell unit, the second cell 332 is disposed above the first cell 331, and the third cell 333 is disposed above the second cell 331. It is placed on top of the cell 332.

The fourth cell 334 is closely disposed in front of the first and second cells 331 and 332 on a horizontal line corresponding to the first cell 331 and the second cell 332, and the first, second and second cells 334 are in close contact with each other. Between the fourth cells 331 , 332 , and 334 , a first injection space 336 having a triangular prism shape extending to one side or the other side is formed.

The fifth cell 335 is disposed on a horizontal line between the second and third cells 332 and 333 at the top of the fourth cell 334, and the second cell 332 and the third cell 333 ) and the fifth cell 335, a second injection space 337 in the form of a triangular prism extending to one side or the other side is formed.

A fourth injection space 339 is formed between the second cell 332, the fourth cell 334, and the fifth cell 335, and a portion of the molding part 500 injected into the fourth injection space 339. is formed in the form of a triangular prism extending to one side or the other side.

As the plurality of cell units are arranged in close contact in the front and rear directions, a third injection process is provided between the second cell 332 formed in the front cell unit and the fourth cell 334 and the fifth cell 335 of the cell unit arranged in the rear. A space 338 is formed.

A first injection space 336a is formed between the first cell 331, the second cell 332, and the fourth cell 334 disposed at the rear, and on both sides of the first injection space 336a, the first and second injection spaces 336a are formed. Second side grooves 342 formed in each of the second sheets 340 and 360 are formed.

A second injection space 337a is formed between the second cell 332, the third cell 333, and the fifth cell 335 disposed at the rear, and the first and second injection spaces 337a are formed on both sides of the second injection space 337a. Second side grooves 342 formed in each of the second sheets 340 and 360 are formed.

In the first to fourth injection spaces 336a, 337a, 338, and 339, a portion of the molding part 500 is formed in the first and second sheets 340 and 360, and the first and second side grooves 341, 342, a portion of the molding part 500 is hardened in the form of a triangular prism extending to one side or the other side while being injected in liquid form.

Accordingly, portions of the molding part 500 injected into the first to fourth injection spaces 336a, 337a, 338, and 339 are formed between the first to fifth cells 331, 332, 333, 334, and 335. Improves dustproof, waterproof, dripproof, fireproof and shockproof functions.

Meanwhile, a portion corresponding to the side surface of each of the first and second injection spaces 336 and 337 is recessed in each of the first and second sheets 340 and 360 to have the same shape as the second side groove 342. Side grooves may be additionally formed.

As shown in FIGS. 2, 3 and 5, each of the first and second sheets 340 and 360 is formed in a vertical plate shape extending forward or backward and covering one side and the other side of the cell 300.

Each of the first and second sheets 340 and 360 is face-bonded to one side and the other side of each of the first and second side connectors 310 and 320 to fix the positions of the cells 300, and the cells 300 and the first and second side connectors 310 and 320 are fixed to each other.

In each of the first and second sheets 340 and 360, first side grooves 341 and second side grooves 342 are formed to maintain a state spaced apart from each other by the same distance toward the front or rear.

The first side groove 341 extends from the third injection space 338 to the fourth injection space 339 at positions corresponding to one side and the other side of each of the cell units in the form of a bar extending from the first and second sheets ( 340 and 360).

Each of the second side grooves 342 is a portion of each of the first and second sheets 340 and 360 corresponding to one side and the other side of the first injection space 336 and the second injection space 337, respectively. formed through penetration.

Therefore, the cells 300, the first side connector 310, the second side connector 320, the first sheet 340 and the second sheet 360 are coupled to each other in the first space 1. When the molded part 500 in the liquid form is injected into the first space 1, a portion of the molded part 500 passes through the first and second side grooves 341 and 342 into the first to fourth injection spaces. (336, 337, 338, 339).

The second side grooves 342 are formed on the front upper and lower portions of the first side grooves 341, and the first and second side grooves 341 and 342 are formed on the side surfaces of the first and second sheets 340 and 360. It is formed at positions spaced apart from each other by the same interval toward the front or rear.

The BMS 400 is disposed in the second space 2 in front of the blocking plate 210 and is connected to the first connector 410, the second connector 420 and the sensor unit 430, and the BMS 400 When a failure occurs, the cover 250 can be separated from the case 200 and conveniently replaced.

The molding part 500 may also be injected into the second space 2 , and the molding part 500 is placed in the first and second spaces 1 and 2 in a state where the blocking plate 210 is separated from the case 200 . When is injected, the molding part 500 is integrally disposed inside the case 200, so that the dustproof, waterproof, dripproof, fireproof, and shockproof functions of the cells 300 and the BMS 400 are improved.

One end of the first connector 410 is connected to the BMS 400 in the second space 2, and the other end extends to the first space 1 through the top of the blocking plate 210 and is then bent to one side. A portion of the first side connector 310 that is bent and extended toward the bottom along one side of the first sheet 340 and then bent and extended toward the other side to be disposed under the cells 300 and Connected.

One end of the second connector 420 is connected to the BMS 400 in the second space 2, extends rearward through the top of the blocking plate 210, and is bent toward the other side, then the second sheet 360 It is bent and extended downward along the other side of the cell 300 and is connected to a part of the second side connector 320 disposed below the cells 300 .

Since the first and second connectors 410 and 420 surround the respective side surfaces of the first and second sheets 340 and 360 and are coupled to the first and second side connectors 310 and 320, respectively, the first And the second sheets 340 and 360 are strongly fixed to the sides of the cells 300 .

One end of the sensor unit 430 is connected to the BMS 400 in the second space 2 and the other end extends from one end toward the rear and passes through the blocking plate 210 to be disposed on top of the cells 300, and the cell ( 300) detects the temperature or remaining power capacity.

The connection terminals 440 are disposed in front of the BMS 400 in the second space 2, and are partially exposed to the outside through the front surface of the case 200, and are connected to external terminals to form cells 300. Connect electrically to external devices.

The molding unit 500 is a polymer molding agent in the form of liquid, sol, or gel, and is placed inside the case 200 while being introduced into the first space 1 or the second space 2 and cured, and has elasticity and shock absorption. It has a function to safely fix the cells 300.

The molding unit 500 may be used as a polymer potting agent in the form of liquid, sol or gel.

2 to 4, the molding part 500 is formed in the form of a square block extending forward or backward, and on one side and the other side, the protrusion 510 inserted into the groove formed between the inner protrusions 220. ) are formed.

Each of the protrusions 510 is formed in the shape of a column extending upwards and downwards with an isosceles trapezoidal cross-section by partially contracting and protruding from one side and the other side of the molding unit 500 to one side and the other side.

Each of the protrusions 510 is inserted between the inner protrusions 220 to come into close contact with the inner surface of the case 200, and is coupled to the case 200 while being engaged with the inner protrusions 220 so that the molding portion 500 is moved forward. Alternatively, the cells 300 are safely fixed by preventing them from being shaken backward, and parts of the molding parts 500 injected into the first to fourth injection spaces 336, 337, 338, and 339 are prevented from being damaged by shaking. do.

Therefore, forward and backward shaking of the portion corresponding to both sides of the molding part 500 is prevented by the protrusions 510 and the inner protrusions 220, and thereby the first to fourth injection spaces 336, 337, 338, A part of the molding part 500 injected into 339 is prevented from being damaged by shaking.

In the lower part of the molding part 500, square-shaped adhesive surfaces 520 spaced apart by the same distance along the front and rear are formed, and the adhesive surfaces 520 are spaced apart with the space in which the cells 300 are arranged. While cured, it adheres to the inner bottom surface of the case 200 .

Meanwhile, the battery pack 100 may be disposed inside the first space 1 such that the first or second sheets 340 and 360 face upward, and the molding part 500 is formed in the first space 1. The molding material, which is a raw material of the , is injected and the cover 250 is coupled to the case 200 so that the molding part 500 can be injected into the space corresponding to the cells 300 by the pressure of the cover 250 .

In addition, the BMS 400 and the blocking plate 210 are disposed outside the case 200, and the cells 300, the first side connector 310, the second side connector 320, and the first sheet 340 And when the second sheet 360 is disposed in the first space 1 and the cover 250 seals the upper portion of the case 200, the connection terminal 440 is formed on the front surface of the case 200 to be inserted. It is possible to manufacture the molding part 500 by injecting the molding material into the through hole and sealing the through hole.

In this case, the molding material injected into the first space 1 through the hole moves along the space corresponding to the upper and lower portions or both sides of the cells 300 and is injected into the first space 1 to form the cells 300. It surrounds and hardens in the form of the molding part 500.

In addition, the upper groove 505 formed on the upper part of the molding part 500 is the first connector 410, the second connector 420 and the sensor part ( 430, there is an advantage in that the first connector 410, the second connector 420, and the sensor unit 430 are protected by the molding unit 500.

In addition, in a state in which the first and second connectors 410 and 420 and the sensor unit 430 fix the positions of the first sheet 340, the second sheet 360, and the cells 300, the first connector 410 ), the second connector 420 and the sensor unit 430 are manufactured in a form covered by the molding unit 500, the first connector 410 and the second connector inserted inside the molding unit 500 ( 420) and the sensor unit 430, there is an advantage in that the shape of the molding unit 500 is stably maintained.

In addition, since the upper holder 550 intersects the inner protrusion 220 and adheres to the inner surface of the case 200 and is formed to be inserted into the first and second spaces 1 and 2, the molding material In a state where the molding material is injected into the first and second spaces 1 and 2, the molding material gathered toward the edges of the first and second spaces 1 and 2 moves to the lower part of the first and second spaces 1 and 2. It can act as a push rod.

As shown in FIG. 6 , the manufacturing method of the battery pack 100 includes a cell accommodating step (S101), a BMS accommodating step (S102), an injection step (S103), and a sealing step (S104).

In the cell receiving step (S101), the single or plurality of cells 300 coupled to each other, the first side connector 310, the second side connector 320, the first sheet 340 and the second sheet 360 are This is the step of disposing in the first space 1 of the case 200, and when the BMS 400 is installed outside the case 200, the cells 300 may also be accommodated in the second space 2.

The BMS receiving step (S102) is a step of arranging the BMS 400 connected to the cells 300 in the second space 2 of the case 200, and in the second space 2, instead of the BMS 400, the cell ( 300) may be arranged.

The injection step (S103) is a step of injecting the molding part 500 into the first space 1 of the case 200, and also injecting the molding part 500 into the second space 2 so that the battery pack 100 itself It can improve dust-proof, drip-proof and shock-absorbing functions.

The sealing step (S104) is a step of sealing the upper opening of the case 200 through the cover 250, and in the case of injecting the molding part 500 into the first and second spaces 1 and 2, the cover 250 ), the sealing step can be completed without

On the other hand, since each of the first and second sheets 340 and 360 is integrated with the molding part 500 while the molding part 500 is injected into the case 200, the edge portion is formed by the cells 300, The first side connector 310 and the second side connector 320 are bonded, and the inner portion may be formed in a mesh shape or a mesh shape in which a plurality of grooves are formed in a lattice shape.

In addition, in the injection step (S103), the molding unit 500 may be injected in advance into the first space (1) or the second space (2) in a step before the cell accommodating step (S101) and the BMS accommodating step (S102), In this case, there is an advantage in that the molding part 500 is effectively introduced into the spaces between the cells 300 and the cells 300 and the case 200 are firmly coupled.

In addition, the molding unit 500 uses any one of gel or liquefied urethane foam, extruded gel or liquefied silicone, gel or liquefied polymer material, and in the case of silicone extruded material, elasticity, heat resistance, flame retardancy and weather resistance are excellent, so it is semi-permanent It is suitable for environments with high external temperature and vibration applied from the outside.

In addition, when urethane foam is used as the molding part 500, the adhesion to the face material is improved, so that the first sheet 340, the second sheet 360, the cells 300 and It is strongly adhered to the inner surface of the case 200 and has a high insulation effect, so it is suitable for the battery pack 100 used in areas with high or low temperatures.

In addition, when foam in which a net-shaped space is formed inside is used as the molding part 500, the shock absorbing function of the cells 300 is improved and the weight is reduced, so the weight of the battery pack 100 It is effective for mobility or vehicles where reduction is essential.

In addition, the first and second side connectors 310 and 320 are first and second side grooves 341 and 342 formed in the first and second sheets 340 and 360 bonded to one side and the other side, respectively. The same groove may be formed to provide a passage through which the molding part 500 is effectively introduced into the space between the cells 300 .

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and represent all the technical ideas of the present invention. Since it is not, it should be understood that there may be various equivalents and modifications that can replace them at the time of this application. Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their All changes or modified forms derived from equivalent concepts should be construed as being included in the scope of the present invention.

100: battery pack 200: case
250: cover 300: cell
400: BMS 500: molding part

Claims (6)

case;
a cell disposed inside the case;
a sheet attached to the cell to fix the position of the cell;
a BMS coupled to the case and electrically connected to the cell; and
Including; a molding portion formed to be injected into the case and cured to be coupled with the cell and the sheet;

The case is
A blocking plate disposed between the cell and the BMS to partition the inner space of the case into first and second spaces in which the cell and the BMS are respectively accommodated,
The blocking plate is formed in the form of a vertical plate extending upward or downward, and borders on both sides are detachably coupled to the inner surface of the case in front of the first space,

The case is formed in the form of a square container extending forward or backward, and first and second spaces separated from each other inside are open toward the top, and one side and the other inner surface of the inside face toward the first and second spaces. Protruding inner protrusions are formed,

In each of the inner protrusions, portions spaced apart from the inner surface of the case by the same distance in the front and rear are contracted and extended toward the first and second spaces to form an isosceles trapezoidal cross section and a column extending toward the top or bottom,

The cells are formed in a cylindrical shape in which the anode and the cathode are disposed toward one side or the other side, and the outer surfaces of each of the cells are disposed while being in close contact with each other, and electrodes are disposed on one or the other side of the stacked cells. In this case, the electrodes are arranged in a triangular grid,

The molding part is formed with a protrusion on the side,
Each of the protrusions is inserted between the inner protrusions and is in close contact with the inner surface of the case, and is engaged with the inner protrusions to prevent the molding part from shaking forward or backward, thereby securely fixing the cells. battery pack with
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