CN211404549U

CN211404549U - Battery pack

Info

Publication number: CN211404549U
Application number: CN201890000946.XU
Authority: CN
Inventors: 李相州
Original assignee: Samsung SDI Co Ltd
Current assignee: Samsung SDI Co Ltd
Priority date: 2017-06-16
Filing date: 2018-01-30
Publication date: 2020-09-01
Anticipated expiration: 2028-01-30
Also published as: KR102332332B1; KR20180137313A; WO2018230805A1

Abstract

The utility model provides a design is for having the group battery of improved durability and security, this group battery includes: a battery cell including an electrode assembly, a sealing case for accommodating the electrode assembly, and first and second cell tabs having different polarities; a protection circuit module disposed on one side of the battery cell and electrically connected to the first cell tab and the second cell tab; and a module case having an opening on one side thereof, accommodating the protective circuit module through the opening, and shaped such that both ends of the module case have a width narrower than a central portion of the module case in a direction perpendicular to a longitudinal direction of the opening. It is possible to realize a battery pack having improved durability.

Description

Battery pack

Technical Field

The present disclosure relates to a battery pack having improved durability.

Background

Secondary batteries, typically lithium secondary batteries having high energy density and operating voltage and excellent preservation and life characteristics, have been widely used as energy sources for various electronic products as well as various mobile devices. According to the kind of external device in which the secondary battery is used, the secondary battery may have a detachable structure in which the secondary battery is easily inserted into and removed from the external device, or an embedded structure in which the secondary battery is embedded in the external device. For example, the battery may be inserted into or removed from a device such as a notebook computer, depending on the needs of the user. On the other hand, devices such as some types of mobile phones require an embedded battery pack due to their structure and capacity.

Meanwhile, since various combustible materials are contained in the lithium secondary battery, the lithium secondary battery may be heated or may explode in the case of overcharge, overcurrent, or other external physical impacts, and thus the lithium secondary battery has a great disadvantage in safety. For this reason, safety elements, such as a Positive Temperature Coefficient (PTC) element and a Protection Circuit Module (PCM), which are capable of effectively controlling an abnormal state, such as overcharge or overcurrent, of the lithium secondary battery, are connected to the battery cells of the lithium secondary battery.

Generally, an embedded secondary battery pack uses flat battery cells suitable for an electrical connection structure, and a PCM or the like is connected to the battery cells via conductive nickel plates using welding (weld) or soldering (solder). In other words, a nickel plate is welded or soldered to electrode terminals of the battery cell, and an electrode tab of an F-PCB is welded to the nickel plate to connect the PCM to the battery cell in a state in which the double-sided tape is brought into tight contact with the battery cell by welding a flexible Printed Circuit Board (PCB) to one side of the double-sided tape and attaching a protective tape to the opposite side of the double-sided tape, thereby manufacturing a battery pack.

SUMMERY OF THE UTILITY MODEL

Technical problem

When external impact is applied to such a battery pack, the PCM having low mechanical strength may be damaged, or dimensional stability may be significantly reduced. Therefore, a technology for stably coupling members mounted on the battery cells to each other and protecting the PCM is highly required.

In order to solve many problems including the above-described problems, embodiments provide a battery pack having improved durability. However, these embodiments are merely examples and do not limit the scope of the present disclosure.

Technical scheme

According to an aspect of the present disclosure, a battery pack includes: a battery cell including an electrode assembly, a sealing case accommodating the electrode assembly, and first and second cell tabs having different polarities; a protection circuit module at one side of the battery cell, the protection circuit module being electrically connected to the first cell tab and the second cell tab; and a module case having an opening at one side of the module case, accommodating the protection circuit module through the opening, and shaped such that: the width of the opposite end portions of the module case is smaller than the width of the central portion of the module case in a direction perpendicular to the longitudinal direction of the opening.

The sealing case may include a sealing stage sealing the electrode assembly with respect to the outside on one side of the sealing case, and a overlap portion formed by folding each of opposite edges of the sealing stage to have a chamfered form.

Each of the opposite ends of the module housing may be positioned to correspond to the overlapping portion of the sealing station.

The module case may have an outer surface exposed to the outside and an inner surface into which the protection circuit module is inserted, and may include a locking piece on the inner surface to support the protection circuit module.

The inner surface of the module case may have a first inner surface facing the first surface and a second inner surface facing the second surface, and the locking member may be located on the first inner surface.

The module housing may include a top portion having a first inner surface and a bottom portion having a second inner surface, and the top portion may have a first recess.

The bottom may have a second recess.

The width of the second recess may be greater than the width of the first recess.

The width of the second recess may be equal to or greater than the width of the first cell tab or the second cell tab.

The module housing may include an outwardly projecting tab at each of the opposite ends of the module housing.

The battery pack may further include an insulating member between the battery cells and the module case.

Beneficial effects of the utility model

According to the embodiment, a battery pack having improved durability may be realized. It will be clear that the scope of the present disclosure is not limited by this effect.

In addition to the description given above, effects can be clearly derived from the description made with reference to the following drawings.

Drawings

Fig. 1 is a front view schematically illustrating a battery pack according to an embodiment.

Fig. 2 is an exploded perspective view schematically illustrating the battery pack of fig. 1.

Fig. 3 is a front view schematically illustrating a process of assembling the battery pack of fig. 1.

Fig. 4 is a sectional view schematically showing a section taken along line a-a of the battery pack of fig. 1.

Fig. 5 is a front view schematically illustrating a module case of the battery pack of fig. 1.

Fig. 6 is a front view schematically showing a portion of the battery pack of fig. 1 including a module case.

Fig. 7 is a diagram schematically illustrating some manufacturing processes of a battery pack according to an embodiment.

Detailed Description

Since the embodiments are susceptible to various modifications and alternative embodiments, example embodiments will be shown in the drawings and will be described in detail in the written description. Advantageous effects, features, and methods for achieving the effects and features will become more apparent by explaining the embodiments in detail with reference to the accompanying drawings. However, the present disclosure is not limited to these embodiments, but may be implemented in various modes.

Embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings, in which like reference numerals refer to like elements, and a description thereof will be omitted.

The terms first, second, etc. are used in the description of the embodiments to distinguish one element from another.

As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the terms "comprises" and/or "comprising" or "includes" and/or "including," when used in this specification, specify the presence of stated features or components, but do not preclude the presence or addition of one or more other features or components.

It will also be understood that when a portion of a film, region, element, etc. is referred to as being "on" another portion, it can be directly on the other portion, or intervening films, regions, or elements may also be present.

In an embodiment, the x-axis, y-axis, and z-axis may not be limited to the three axes of a rectangular coordinate system, but may be interpreted in a broader sense. For example, the x, y, and z axes may be orthogonal to each other, or may indicate different directions that are not orthogonal.

In the drawings, the size of elements may be exaggerated or reduced for clarity. For example, the size and thickness of each element may be arbitrarily shown in the drawings, and thus, the present invention is not limited to the drawings.

Fig. 1 is a front view schematically illustrating a battery pack according to an embodiment, fig. 2 is an exploded perspective view schematically illustrating the battery pack of fig. 1, and fig. 3 is a front view schematically illustrating a process of assembling the battery pack of fig. 1.

Referring to fig. 1 and 2, the battery pack includes a battery cell 100, a protection circuit module 200 electrically connected to the battery cell 100, and a module case 300 accommodating the protection circuit module 200. The battery cell 100 may include an electrode assembly (not shown), a sealing case 110 accommodating the electrode assembly, and a cell tab 102.

The electrode assembly may include first and second electrode plates coated with an electrode active material, and a separator between the first and second electrode plates. The first electrode plate and the second electrode plate have different polarities. The electrode assembly may be manufactured by sequentially stacking the first electrode plate, the separator, and the second electrode plate and then winding them in a swiss roll (jelly-roll) shape. In another embodiment, the electrode assembly may be a stacking type electrode assembly in which a first electrode plate, a separator, and a second electrode plate are sequentially stacked.

The sealing case 110 may include a storage space in which the electrode assembly is accommodated. The sealing case 110 may include an opening on one side and accommodate the electrode assembly through the opening. The hermetic case 110 may include a metal material such as an aluminum thin film. In detail, the sealing case 110 has a stacked structure in which the sealing case 110 includes a film of a metal material as a top surface and a synthetic resin such as nylon, polypropylene, or polyethylene as a bottom surface, and includes a thermal adhesive resin for sealing in the inside thereof. Therefore, when the heat bonding resin applied to the inside of the sealing case 110 is melted by heat and pressure, the sealing case 110 may be sealed. In the current embodiment, the sealed case 110 may contain an electrode assembly and an electrolyte, and may be a flexible pouch case.

The sealing housing 110 may include a sealing station 110a on one side thereof. The sealing stage 110a is a portion of one of the outer sides formed when the electrode assembly is sealed in the sealing case 110 made of a laminate sheet, wherein the portion has a remaining space.

The sealing case 110 may include a sealing stage 110a on one side thereof, wherein the sealing stage 110a seals the electrode assembly with respect to the outside. The sealing stage 110a may include an overlap portion 110b at each of opposite edges thereof, wherein the overlap portion 110b is formed to have a chamfered (chamfer) form by folding each edge.

Referring to fig. 2, the cell tab 102 may include a first cell tab 102a and a second cell tab 102b having different polarities. Although not shown, the first and

second cell tabs

102a and 102b may be connected to the electrode assembly. For example, the first cell tab 102a may be connected to a first electrode plate, and the second cell tab 102b may be connected to a second electrode plate, such that the first cell tab 102a has a positive electrode and the second cell tab 102b has a negative electrode. The first cell tab 102a and the second cell tab 102b may be electrically connected to the protection circuit module 200.

The protection circuit module 200 may be disposed at one side of the battery cell 100 and electrically connected to the battery cell 100. The protection circuit module 200 may be electrically connected to the battery cell 100 in order to control the charge and discharge of the battery cell 100 and prevent overheating and explosion from occurring due to overcharge, overdischarge, or overcurrent. The protection circuit module 200 may include external terminals 204 extending outward lengthwise. The external terminal 204 may electrically connect the battery pack to an external device. A connector 205 connected to an external device may be provided at an end of the external terminal 204.

The protection circuit module 200 may include a lead tab 202 on one surface. The lead tabs 202 may be connected to the first and

second cell tabs

102a and 102b of the battery cell 100. The lead tab 202 of the protection circuit module 200 and the cell tab 102 of the battery cell 100 may be joined by, for example, spot welding.

Although not shown, the protection circuit module 200 may include a circuit board, and a protection element and a temperature sensor mounted on the circuit board. The circuit board may extend in the longitudinal direction along the side of the battery cell 100. The protection element may optionally include a security element including a passive element such as a resistor or capacitor of a circuit board or an active element such as a field transistor or an integrated circuit.

The module case 300 may include an opening OP at one side thereof to receive the protection circuit module 200. The protection circuit module 200 may be seated in the module case 300 through the opening OP of the module case 300. The module case 300 may protect the protection circuit module 200 from external impact. The module case 300 will be described in detail with reference to fig. 3 to 5.

Meanwhile, as shown in fig. 2, insulating

films

511, 512, 513, 514, 515, and 516 may be attached to the outer surfaces of the battery cells 100 to protect the battery cells 100 and insulate the battery cells 100 from the outside. For example, the insulating

films

511, 512, 513, 514, 515, and 516 may be adhesive tapes each having adhesiveness on one side thereof. The insulating

films

511, 512, 513, 514, 515, and 516 may be disposed to cover the front, rear, left, right, top, and bottom of the battery cell 100. Specifically, the insulating film 515 disposed above the battery cell 100 may fix the module case 300 to the battery cell 100.

Referring to fig. 2, for the battery pack according to the current embodiment, the protection circuit module 200 may be first electrically connected to the battery cell 100. The battery cell 100 includes a first cell tab 102a and a second cell tab 102 b. The first cell tab 102a and the second cell tab 102b may be connected to the lead tab 202 of the protection circuit module 200. In other words, as shown in fig. 2, the protection circuit module 200 may be arranged such that the external terminal 204 is oriented in the first direction (or-z direction) and thus connected to the cell tab 102.

In a state in which the protection circuit module 200 has been connected to the cell tab 102 of the battery cell 100, the protection circuit module 200 is inserted into the module case 300. The module case 300 includes an opening OP at one side thereof. In the process of inserting the protection circuit module 200 into the module case 300, the module case 300 is positioned such that the opening OP is oriented in the first direction (or-z direction). In this state, the protection circuit module 200 may be inserted into the module case 300.

The assembled battery cell 100, the protection circuit module 200, and the module case 300 as described above may be provided as shown in fig. 3. Thereafter, the module case 300 is fixed by the jig Z at each of the opposite sides of the module case 300 and rotated by 180 ° about the rotation axis RAX. The module housing 300 may include a tab 310 at each of its opposing ends. The protrusion 310 protrudes outward and may serve as a handle (handle) of the clamp Z to allow the clamp Z to easily perform a process of rotating the module case 300.

As shown in fig. 1, the module case 300 rotated as described above may be seated in the sealing land 110a of the battery cell 100. Accordingly, the opening OP of the module case 300 may be finally positioned toward the second direction (or + z direction), and the lead tab 202 of the protection circuit module 200 may also be positioned toward the second direction (or + z direction).

Referring to fig. 1 and 4, the battery pack, which has been packaged through the above-described assembly procedure, may include a module case 300 on the sealing stage 110a of the battery cell 100. As shown in fig. 4, the module case 300 may have

In a cross-section of the shape, the opening OP at one side of the module case 300 may be opened in a second direction (or + z direction) opposite to the battery cell 100.

In an embodiment, the insulating member 520 may be between the module case 300 and the battery cell 100. For example, the insulating member 520 may be an insulating film. The insulating member 520 may prevent heat generated in the battery cell 100 from being transferred to the module case 300 and the protection circuit module 200 and insulate the module case 300 from the battery cell 100. Although it is illustrated in fig. 4 that the module case 300 is spaced apart from the insulating member 520 by a certain distance, the module case 300 may be in direct contact with the insulating member 520.

The insulating film 515 may be on the module case 300. The insulating film 515 may be, for example, an insulating tape having adhesiveness on one side, and may be positioned on the module case 300 to cover the module case 300. As shown in fig. 1 and 4, the insulating film 515 may partially extend to the battery cell 100, and may be disposed to cover a portion of the battery cell 100 and the module case 300, thereby fixing the module case 300 to the battery cell 100.

Fig. 5 is a front view schematically showing a module case 300 of the battery pack of fig. 1, and fig. 6 is a front view schematically showing a portion of the battery pack of fig. 1 including the module case 300. Fig. 5 shows only the module case 300 separately, and fig. 6 shows a structure in which the protection circuit module 200 and the module case 300 are mounted on the battery cell 100.

Referring to fig. 5 and 6, the module case 300 includes an opening OP at one side thereof, and may be shaped such that the width "we" of the opposite end portions 300e is smaller than the width "wc" of the central portion 300c in a direction perpendicular to the longitudinal direction of the opening OP. As shown in fig. 6, the opposite end 300e of the module case 300 may be positioned to correspond to the overlap portion 110b of the sealing stage 110 a.

As shown in fig. 2, the sealing case 110 may include a sealing stage 110a on one side thereof, wherein the sealing stage 110a seals the electrode assembly with respect to the outside. The sealing stage 110a may include an overlap portion 110b at each of opposite edges thereof, wherein the overlap portion 110b is formed by folding each edge to have a chamfered form. The module case 300 is mounted on the sealing stage 110 a. It is important to design the module case 300 to avoid the overlap portion 110b of the sealing stage 110 a. When the module case 300 is not designed to avoid the overlap portion 110b, the module case 300 may not be compactly seated on the sealing stage 110a and may be lifted from the sealing stage 110a, thereby making it difficult to reliably connect the protection circuit module 200 to the battery cell 100.

Since the width "we" of the opposite ends 300e of the module case 300 is smaller than the width "wc" of the central portion 300c thereof, a remaining space "s" is provided in each of the opposite ends 300e of the module case 300. The remaining space "s" may be positioned to correspond to each of the opposite edges of the sealing stage 110 a. According to the current embodiment, the sealing stage 110a may be disposed on one side of the battery cell 100, and the overlap portion 110b may be disposed by folding each of opposite edges of the sealing stage 110a to have a chamfered form, to reduce external interference and compactly form the edge of the sealing stage 110 a. Since the overlap portion 110b is formed by folding each of the opposite edges of the sealing stage 110a, the overlap portion 110b may be thicker than the other portions of the sealing stage 110 a. Therefore, when the module case 300 is designed to avoid the overlap portion 110b by forming the width "we" of the opposite end portions 300e of the module case 300 to be smaller than the width "wc" of the central portion 300c thereof, the module case 300 can be more reliably seated on the sealing table 110a, and a battery pack having a compact structure can be realized.

The module case 300 may include an outer surface 300u exposed to the outside and an inner surface 300i into which the protection circuit module 200 is inserted. The locking piece 320 supporting the protection circuit module 200 may be located on the inner surface 300i of the module case 300.

As described above, the protection circuit module 200 is formed by integrating many elements and members onto a circuit board having a board shape, and may thus have the first surface 200a and the second surface 200b around the circuit board. The protection circuit module 200 may include a first surface 200a and a second surface 200 b. The inner surface 300i of the module case 300 may include a first inner surface 300ia facing the first surface 200a of the protective circuit module 200 and a second inner surface 300ib facing the second surface 200b of the protective circuit module 200. Referring to fig. 5, the locking member 320 may be located on the first inner surface 300ia to correspond to the top of the module case 300. The latches 320 may support the protection circuit module 200, thus preventing the protection circuit module 200 from being separated from the module case 300.

Meanwhile, according to the current embodiment, the module case 300 may include a top 300a having a first inner surface 300ia and a bottom 300b having a second inner surface 300 ib. The first recess 330 may be located in the top 300a of the module case 300. In an embodiment, the first recess 330 may be formed at each of opposite sides of the latch 320, thereby facilitating locking between the latch 320 and the protection circuit module 200.

In addition, the second recess 340 may be located in the bottom 300b of the module case 300. In an embodiment, the second recess 340 may be symmetrically disposed at each of both sides of the bottom 300 b. The second recess 340 may be considered as a structure: this structure serves to avoid interference between the cell tabs 102 connecting the battery cells 100 to the protection circuit module 200 and the module case 300 into which the protection circuit module 200 has been inserted.

In the current embodiment, the width w4 of the second recess 340 may be greater than the width w3 of the first recess 330. The second recess 340 is provided to avoid interference of the cell tab 102 as described above, and may desirably have a width equal to or greater than the width of the cell tab 102.

Referring to fig. 7, for the battery pack according to the embodiment, the protection circuit module 200 may be inserted into the module case 300 and then connected to the battery cell 100. In other words, although the battery pack is manufactured by first connecting the protection circuit module 200 to the battery cell 100 and then inserting the protection circuit module 200 into the module case 300 in the above-described previous embodiment, in the current embodiment, the battery pack is manufactured by first inserting the protection circuit module 200 into the module case 300 and then connecting the protection circuit module 200 to the battery cell 100. At this time, the cell tabs 102 of the battery cells 100 may be electrically connected to the lead tabs of the protection circuit module 200 by welding.

As shown in (a) of fig. 7, the protection circuit module 200 may be inserted into the module case 300 in the direction a. The protection circuit module 200 inserted into the module case 300 may be integrated as shown in (b) of fig. 7. After that, the cell tabs 102 of the battery cells 100 may be connected to the lead tabs 202 of the protection circuit module 200 by welding.

Although the present disclosure has been described with reference to the embodiments shown in the drawings, it will be understood by those skilled in the art that various changes in form and details may be made therein. Accordingly, the scope of the present disclosure will be defined by the technical idea of the claims.

Claims

1. A battery pack, characterized in that the battery pack comprises:

a battery cell including an electrode assembly, a sealing case accommodating the electrode assembly, and first and second cell tabs having different polarities;

a protection circuit module at one side of the battery cell, the protection circuit module being electrically connected to the first cell tab and the second cell tab; and

and a module case having an opening at one side thereof, accommodating the protective circuit module through the opening, and shaped such that opposite end portions of the module case have a width smaller than a width of a central portion of the module case in a direction perpendicular to a longitudinal direction of the opening.

2. The battery pack of claim 1, wherein the sealed housing comprises: a sealing table located on one side of the sealing housing; and a superposition portion that seals the electrode assembly with respect to the outside by a sealing table, and is formed by folding each of opposite edges of the sealing table to have a chamfered form.

3. The battery pack of claim 2, wherein each of the opposing ends of the module housing is positioned to correspond with an overlapping portion of the sealing land.

4. The battery pack according to claim 1, wherein the module case has an outer surface exposed to the outside and an inner surface into which the protection circuit module is inserted, and

the module case includes a locking member supporting the protection circuit module on an inner surface.

5. The battery pack according to claim 4, wherein the inner surface of the module case has a first inner surface facing the first surface and a second inner surface facing the second surface, and

the locking member is located on the first inner surface.

6. The battery of claim 5, wherein the module housing includes a top portion having a first interior surface and a bottom portion having a second interior surface, and

the top has a first recess.

7. The battery of claim 6, wherein the bottom has a second recess.

8. The battery pack of claim 7, wherein the width of the second recess is greater than the width of the first recess.

9. The battery pack according to claim 7, wherein a width of the second recess is equal to or greater than a width of the first cell tab or the second cell tab.

10. The battery of claim 1, wherein the module housing includes an outwardly projecting tab at each of the opposite ends of the module housing.

11. The battery pack of claim 1, further comprising an insulating member between the battery cells and the module housing.

12. The battery pack according to claim 1, wherein the module case has an opening portion in one surface of the module case, the opening portion corresponding to the first cell tab or the second cell tab.