Battery pack and method for manufacturing same

Abstract

A battery pack for an electrical device includes a housing defining a chamber and a plurality of ribs extending inwardly toward the chamber. The battery pack further includes: a plurality of battery cells disposed within the chamber and configured to supply power to the electrical device; a support structure configured to receive and support the plurality of battery cells within the chamber of the housing; and the circuit board is arranged in the shell and is positioned at the top of the supporting structure. The circuit board includes a plurality of electrical components and is configured to selectively drive the plurality of battery cells. The battery pack also includes a battery cell potting body surrounding the plurality of battery cells and the support structure. The battery cell potting body includes a plurality of grooves that cooperate with the plurality of ribs of the housing to inhibit movement of the plurality of battery cells relative to the housing.

Description

Technical Field

[0001] This disclosure relates to battery packs, and more specifically, to battery cells within a potted battery pack. Summary of the Invention

[0002] Power tools can be powered by portable battery packs. These battery packs contain battery chemistry and nominal voltage and can be used to power many tools and electrical devices. Battery packs typically include more than one battery cell, which is located within and organized within the housing of the battery pack.

[0003] In one aspect, this disclosure provides a battery pack for an electrical device, the battery pack including a housing defining a cavity and having at least one terminal configured to electrically connect the battery pack to the electrical device and a plurality of ribs extending inwardly toward the cavity. The battery pack further includes: a plurality of battery cells disposed within the cavity of the housing and configured to provide power to the electrical device; a support structure configured to receive and support the plurality of battery cells within the cavity of the housing; and a circuit board disposed within the housing on top of the support structure. The circuit board includes a plurality of electrical components and is configured to selectively drive the plurality of battery cells. The battery pack also includes a battery cell potion surrounding the plurality of battery cells and the support structure. The battery cell potion includes a plurality of recesses that engage with the plurality of ribs of the housing to inhibit movement of the plurality of battery cells relative to the housing.

[0004] In one aspect, the battery cell potting compound is formed of one of polyurethane, acrylic resin, epoxy resin, and silicone. In one aspect, the battery cell potting compound is formed of a combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone. In one aspect, the combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone is a composite mixture of at least two of polyurethane, acrylic resin, epoxy resin, and silicone. In one aspect, each of the plurality of battery cells is a cylindrical lithium-ion battery cell. In one aspect, the support structure includes a first end shell and a second end shell, wherein the positive electrode of each battery cell is received in one of the first end shell and the second end shell, and wherein the negative electrode of each battery cell is received in the other of the first end shell and the second end shell. In one aspect, the plurality of battery cells are stacked in an offset manner along the height and length of the battery pack, such that the plurality of battery cells define cell rows and cell columns. In one aspect, the battery cell potting compound is disposed only between cell rows, or only between cell columns. In one aspect, the battery cell potting compound also surrounds a circuit board. In one aspect, gaps between adjacent battery cells of the plurality of battery cells are also included. In one aspect, the battery cell potting compound separates the battery cells.

[0005] In another aspect, the present invention provides a battery pack for an electrical device, comprising a housing having a first housing portion, a second housing portion coupled to the first housing portion, a cavity, and at least one terminal configured to electrically connect the battery pack to the electrical device. The battery pack further includes a battery cell assembly comprising: a plurality of battery cells disposed within the cavity and configured to supply power to the electrical device; a support structure receiving and supporting the plurality of battery cells within the cavity of the housing; and a battery cell potting compound surrounding the plurality of battery cells and the support structure. The battery pack further includes a circuit board disposed within the housing on top of the plurality of battery cells and including a plurality of electrical components. The circuit board is configured to selectively drive the plurality of battery cells. The circuit board is coupled to the battery cell assembly.

[0006] In one aspect, the battery cell potting compound is formed of one of polyurethane, acrylic resin, epoxy resin, and silicone. In another aspect, the battery cell potting compound is formed of a combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone. In another aspect, the combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone is a composite mixture of at least two of polyurethane, acrylic resin, epoxy resin, and silicone. In one aspect, each of the plurality of battery cells is a cylindrical lithium-ion battery cell. In one aspect, the support structure includes a first end shell and a second end shell, wherein a circuit board is connected to at least one of the first end shell and the second end shell.

[0007] In another aspect, the present invention provides a method for manufacturing a battery pack for a power tool. The battery pack includes: a housing having a first housing portion and a second housing portion, the second housing portion having a plurality of ribs extending inwardly toward a cavity of the housing; a battery cell assembly disposed within the cavity of the housing, having a plurality of battery cells and a support structure supporting the plurality of battery cells; and a circuit board positioned within the housing at the top of the battery cell assembly. The method includes: injecting a battery cell potting compound around the plurality of battery cells and the support structure such that the plurality of battery cells and the support structure are coupled together via the battery cell potting compound; forming a plurality of recesses within the battery cell potting compound, the plurality of recesses being configured to receive the plurality of ribs of the housing; and sliding the plurality of recesses along the plurality of ribs to secure the battery cell assembly within the cavity and inhibit movement of the plurality of battery cells relative to the housing. In one aspect, the method further includes forming a battery cell potting compound having a thermosetting adhesive, the battery cell potting compound providing a heat dissipation medium between the plurality of battery cells. In another aspect, the method further includes forming a plurality of gaps between adjacent battery cells in the plurality of battery cells.

[0008] Other aspects of this disclosure will become apparent from consideration of the detailed description and accompanying drawings. Attached Figure Description

[0009] Figure 1 This is a perspective view of a battery pack according to an embodiment of the present invention.

[0010] Figure 2 yes Figure 1 An exploded view of the battery pack shows the housing and battery cell assembly disposed within the housing, according to some embodiments.

[0011] Figure 3 It is according to some embodiments along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0012] Figure 4 According to some embodiments Figure 3 An exploded perspective view of the battery cell assembly.

[0013] Figure 5 According to another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0014] Figure 6 According to yet another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0015] Figure 7 According to yet another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0016] Figure 8 According to yet another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0017] Figure 9 According to yet another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3.

[0018] Figure 10 According to yet another embodiment of the battery pack, along Figure 2 The cross-sectional view of the battery cell assembly taken from line 3-3. Detailed Implementation

[0019] Before explaining any embodiments of the invention in detail, it should be understood that the application of the invention is not limited to the details of the construction and arrangement of the components set forth in the following description or shown in the following drawings. The invention can have other embodiments and can be practiced or performed in various ways.

[0020] Figure 1 and Figure 2 A battery pack 10 according to some embodiments is shown. The battery pack 10 can be connected to and operated to power electrical devices such as handheld power tools (e.g., drills, fasteners, saws, pipe cutters, grinders, nailers, staplers, vacuum cleaners, etc.), motorized power tools (e.g., cutting saws, miter saws, table saws, core drills, augers, crushers, hydraulic breakers, compactors, vibrators, compressors, drain cleaners, welding machines, cable pullers, pumps, etc.), outdoor tools (e.g., chainsaws, rope trimmers, hedge trimmers, blowers, lawnmowers, ride-on lawnmowers, etc.), other motorized devices (e.g., vehicles, multi-purpose carts, material handling trolleys, etc.), and non-motorized electric devices (e.g., power supplies, lights, AC / DC adapters, generators, personal electronic devices, etc.), any of which may now be referred to herein as an "electrical device". Furthermore, in other embodiments, the battery pack 10 can be connected to and operated to power other electrical devices. The battery pack 10 can be removed from the electrical device and can be recharged by a battery charger (not shown).

[0021] Battery pack 10 includes battery chemicals such as lead-acid, nickel-cadmium (“NiCd”), nickel metal hydride (“NiMH”), lithium (“Li”), lithium-ion (“Li-ion”), other lithium-based chemicals, or other rechargeable or non-rechargeable battery chemicals. In some embodiments, battery pack 10 may have a battery chemical comprising Li, lithium-ion, or another Li-based chemical and may supply an average discharge current equal to or greater than about 20 A. In one example, battery pack 10 may have a chemical comprising lithium cobalt (“Li-Co”), lithium manganese (“Li-Mn”) spinel, Li-Mn nickel, or other lithium metal chemicals.

[0022] Battery pack 10 includes a nominal voltage. In some embodiments, battery pack 10 may have a nominal voltage of approximately 9.6V. In other embodiments, battery pack 10 may have a nominal voltage of up to approximately 50V. In some embodiments, battery pack 10 may have a nominal voltage of approximately 21V. In other embodiments, battery pack 10 may have a nominal voltage of approximately 28V. Furthermore, in other embodiments, battery pack 10 may have a nominal voltage of, for example, 12V, 14.4V, 18V, 24V, 40V, or 80V to power electrical devices and be charged by a battery charger (not shown).

[0023] Continue to refer to Figure 1 and Figure 2 The battery pack 10 includes a housing 14 having a first housing portion 16 and a second housing portion 18. (See reference...) Figure 1 and Figure 2 The battery pack 10 shown is oriented such that a first housing portion 16 is an upper housing portion and a second housing portion 18 is a lower housing portion. The battery pack 10 also includes an electrical interface 22 and a locking mechanism 26. The electrical interface 22 is configured for electrical connection to an electrical device, and the locking mechanism 26 is configured for selectively engaging the battery pack 10 to an electrical device. The first housing portion 16 and the second housing portion 18 of the housing 14 are connected together by a plurality of fasteners 28. An O-ring (not shown) is provided at the interface between the first housing portion 16 and the second housing portion 18 to prevent dust and other debris from entering the housing 14. Specifically, when the first housing portion 16 and the second housing portion 18 are engaged together, the O-ring is partially received within a groove 29 extending around the periphery of the second housing portion 18, and further received within a corresponding groove (not shown) extending around the periphery of the first housing portion 16. Thus, the first housing portion 16 and the second housing portion 18 define a chamber 32 having an internal volume. Although fasteners 28 are used to join the first housing portion 16 and the second housing portion 18 together in the illustrated embodiment, in other embodiments, the first housing portion 16 and the second housing portion 18 of the housing 14 may be joined together by adhesives, strips, fasteners, tabs or any combination thereof.

[0024] The battery pack 10 also includes a printed circuit board assembly (PCBA) 34 and a battery cell assembly 36, which are received in a cavity 32 of the housing 14. The PCBA 34 is disposed within the cavity 32 between the battery cell assembly 36 and the first housing portion 16. The PCBA 34 includes one or more terminals 42 that extend through an electrical interface 22 of the first housing portion 16 when the battery pack 10 is assembled. The battery cell assembly 36 may be disposed in and secured to a second housing portion 18. When the battery pack 10 is assembled, the first housing portion 16 and the second housing portion 18 substantially encapsulate the battery cell assembly 36 within the cavity 32. The battery cell assembly 36 includes a support structure 46, a plurality of battery cells 50 supported by the support structure 46, and a battery cell potting compound 54 surrounding the support structure 46 and the plurality of battery cells 50. Figure 4(Best shown in the diagram). In some embodiments, the battery cell assembly 36 may further include an inner housing that receives a support structure 46 and a plurality of battery cells 50 prior to injection into the battery cell potting compound 54. The PCBA 34 is coupled to the battery cell assembly 36. In the illustrated embodiment, the battery cell 50 is a cylindrical battery cell. However, in other embodiments, the battery cell 50 may be a pouch cell, a prismatic cell, or other suitable battery cell. As will be described in further detail below, the injection into the battery cell potting compound 54 ( Figure 4 This provides improved heat dissipation and / or waterproofing for the battery cell assembly 36.

[0025] Reference Figure 4 The support structure 46 includes a first end shell 58, a second end shell 62, and a plurality of power supply plates 66. The battery cell assembly 36 is configured to generate current. In the illustrated embodiment, the battery cells 50 of the battery cell assembly 36 generate direct current (DC), such that the battery pack 10 is configured to provide DC power to the device. In other embodiments, the battery pack 10 may include an inverter, such that the battery pack 10 is configured to provide alternating current (AC) to the device. When the battery pack 10 is assembled, the first end shell 58 and the second end shell 62 are at least partially surrounded within the battery cell potting compound 54. The plurality of battery cells 50 extend between the first end shell 58 and the second end shell 62. Specifically, one end of each of the plurality of battery cells 50 is received in one of the first end shell 58 and the second end shell 62, and the other end of each of the plurality of battery cells 50 is received in the other of the first end shell 58 and the second end shell 62. Furthermore, the battery cells 50 are stacked along the length L and height H of the battery pack 10, with each row of battery cells 50 extending along the length L offset from the adjacent row. Similarly, each column of battery cells 50 along the height H is offset from the adjacent column.

[0026] Reference Figure 3 Each battery cell 50 has a positive electrode 70 at one end and a negative electrode 74 at the other end. The battery cells 50 are arranged between a first end housing 58 and a second end housing 62 with alternating electrode orientations. In the alternating electrode orientation, the positive electrode 70 of each battery cell 50 is positioned adjacent to the negative electrode 74 of the adjacent battery cell 50. The alternating electrode orientation provides a charge difference for the battery cell assembly 36, thereby enabling the battery cell assembly 36 to generate current.

[0027] See back Figure 4Multiple power supply plates 66 are configured to electrically connect battery cells 50 to each other. In the illustrated embodiment, the battery cell assembly 36 includes six power supply plates 66 electrically connected to respective battery cells 50 at a first end housing 58 and six power supply plates 66 electrically connected to respective battery cells 50 at a second end housing 62. However, in other embodiments, more or fewer power supply plates 66 may be used to electrically connect the battery cells 50 in different configurations. The multiple power supply plates 66 also connect multiple battery cells 50 to a PCBA 34 ( Figure 2 This allows the current generated by the battery cell 50 to flow through the power supply board 66, PCBA34, and output terminal 42.

[0028] refer to Figure 2 and Figure 3 In the illustrated embodiment, the battery cell potting compound 54 can substantially surround each battery cell 50. Thus, the plurality of battery cells 50, the support structure 46, and the battery cell potting compound 54 fill a large portion of the chamber 32. The battery cell potting compound 54 can provide a heat dissipation medium for the heat generated by the battery cells 50 during use of the battery pack 10. That is, the heat generated by the battery cells 50 can be transferred and dissipated through the battery cell potting compound 54, rather than remaining in the ambient air of the battery pack 10's housing 14. In this way, the battery cell potting compound 54 can reduce the temperature of the battery cells 50, thereby reducing the internal temperature of the battery pack 10, and thus reducing malfunctions of the battery pack 10 due to overheating.

[0029] The battery cell potting compound 54 also improves the water resistance of the battery pack 10. Specifically, the battery cell potting compound 54 can reduce the amount of space for pores or voids within the chambers 32 of the housing 14, thereby inhibiting the movement of water between or near the battery cells 50. Furthermore, the material of the battery cell potting compound 54 can be waterproof, thus providing a waterproof seal between the battery cells 50. By improving the water resistance of the battery cell assembly 36, the battery cell potting compound 54 improves the battery pack 10's ability to withstand environmental intrusion, thus improving the lifespan of the battery pack 10.

[0030] In the illustrated embodiment, the battery cell potting compound 54 may be formed by a thermosetting adhesive. Specifically, the battery cell potting compound 54 may be formed from one of polyurethane, acrylic resin, epoxy resin, silicone, or another similar compound. In some embodiments, the battery cell potting compound 54 may be formed from a variety of compounds. That is, different battery cells 50 may be surrounded by different types of battery cell potting compounds 54. For example, some battery cells 50 may be surrounded by battery cell potting compounds 54 formed primarily of epoxy resin, and some battery cells 50 may be surrounded by battery cell potting compounds 54 formed primarily of polyurethane. In another embodiment, the battery cell potting compound 54 may be a mixture formed from any combination of compounds disclosed above. For example, the battery cell potting compound 54 may be formed from 50% acrylic resin and 50% silicone. In another example, the battery cell potting compound 54 may be formed from 33% polyurethane, 33% epoxy resin, and 33% silicone.

[0031] refer to Figure 2 and Figure 4 The battery cell potting compound 54 can be formed or supplied via an injection molding process. The injection process involves injecting the battery cell potting compound 54 into a mold (not shown) using an injection tool, such as, but not limited to, a syringe, precision applicator, or other similar injection tool. Specifically, the battery cell potting compound 54 can be injected into the mold in liquid form and then eventually solidify into a solid form. The battery cell 50 and support structure 46 can be placed in the mold prior to the injection of the battery cell potting compound 54, such that the battery cell potting compound 54 solidifies around the battery cell 50 and support structure 46, resulting in no voids in the battery cell assembly 36. The mold can be of any shape / size and various features can be formed in the battery cell potting compound 54 as it solidifies. For example, multiple grooves 78 can be formed on the battery cell potting compound 54 during the injection molding process. The curing time can vary depending on the compound of the battery cell potting compound 54. Once the battery cell potting compound 54 has solidified, the battery cell assembly 36 can be removed from the mold and assembled within the chamber 32 of the housing 14. In other embodiments, the battery cell assembly 36 with the mold can be placed within the housing 14. Specifically, each recess 78 receives a corresponding internal rib 82 of the second housing portion 18 to secure the battery cell assembly 36 within the second housing portion 18, thereby inhibiting movement of the battery cell assembly 36 relative to the housing 14. In some embodiments, a setting agent can be mixed into the battery cell potting compound 54 to reduce the curing time of the battery cell potting compound 54. That is, the battery cell potting compound 54 can be mixed directly with the setting agent before injection. Alternatively, the setting agent can be injected into the mold simultaneously with or after the battery cell potting compound 54 is injected into the mold.

[0032] In other embodiments, the support structure 46 and the plurality of battery cells 50 may be placed in the second housing portion 18, in which case the battery cell potting compound 54 is delivered (i.e., injected, poured, etc.) into the second housing portion 18 to completely surround the support structure 46 and the plurality of battery cells 50. In such an embodiment, the battery cell potting compound 54 submerges and completely engages the second housing portion 18 and surrounds the support structure 46 and the plurality of battery cells 50 disposed therein. Moreover, in such an embodiment, suitable channels may be provided within the second housing portion 18 for airflow through the chamber 32 of the housing 14.

[0033] Figure 5 Another embodiment of the battery cell potting compound 110 for battery cell assembly 36 is shown. Apart from the differences described herein, Figure 5 The battery cell encapsulation 110 can be substantially similar to Figure 3 54. Battery cell encapsulation. Figure 5 The battery cell potting compound 110 is located around each battery cell 50 and substantially encapsulates each battery cell 50, but some gaps 114 exist. Specifically, the gaps 114 are positioned along the outer periphery of the battery cell assembly 36.

[0034] Figure 6 Another embodiment of the battery cell potting compound 150 for battery cell assembly 36 is shown. Apart from the differences described herein, Figure 6 The battery cell encapsulation 150 can be substantially similar to Figure 5 Battery cell encapsulation 110. Figure 6 The battery cell encapsulation 150 is disposed only between adjacent battery cells 50, with gaps 114 existing between the rows and columns of the battery cells 50. That is, Figure 6 The battery cell potting compounds 150 are arranged diagonally in the spaces between each battery cell 50. The battery cell potting compounds 150 do not encapsulate each battery cell 50. Specifically, due to gaps 114, the battery cells 50 positioned along the outer periphery of the battery cell assembly 36 are not completely encapsulated by the battery cell potting compounds 150. Gaps 114 also exist between adjacent battery cells 50.

[0035] Figure 7 Another embodiment of the battery cell potting compound 210 for battery cell assembly 36 is shown. Apart from the differences described herein, Figure 7 The battery cell encapsulation 210 can be substantially similar to Figure 3 54. Battery potting compound. Figure 7The battery cell encapsulation 210 is formed as a strip that extends substantially along the height H of the battery pack 10. The battery cell encapsulation 210 extends between adjacent rows of battery cells 50. A gap 114 exists between adjacent battery cells 50 along the height H.

[0036] Figure 8 Another embodiment of the battery cell potting compound 250 for battery cell assembly 36 is shown. Apart from the differences described herein, Figure 8 The battery cell encapsulation 250 can be substantially similar to Figure 7 210 battery cell encapsulation. Figure 8 The battery cell encapsulation bodies 250 alternately surround the entire row of battery cells 50. Thus, a row of battery cells 50 surrounded by battery cell encapsulation bodies 250 is adjacent to a row not surrounded by battery cell encapsulation bodies 250. This creates gaps 114 in the rows without battery cell encapsulation bodies 250.

[0037] Figure 9 Another embodiment of the battery cell potting compound 310 for the battery cell assembly 36 is shown. Apart from the differences described herein, Figure 9 The battery cell encapsulation 310 can be substantially similar to Figure 7 210 battery cell encapsulation. Figure 9 The battery cell encapsulation 310 is formed as a strip extending substantially along the length L of the battery pack 10. The battery cell encapsulation 210 extends between adjacent rows of battery cells 50. There are gaps 114 between adjacent battery cells 50 along the length L.

[0038] Figure 10 Another embodiment of the battery cell potting compound 350 for the battery cell assembly 36 is shown. Apart from the differences described herein, Figure 10 The battery cell encapsulation 350 can be basically similar to Figure 9 310 battery cell encapsulation. Figure 10 The battery cell encapsulation 350 surrounds the entire row of battery cells 50. In some embodiments, the battery cell encapsulation 350 may surround the row of battery cells 50 in an alternating manner. Some rows of battery cells are not surrounded by the battery cell encapsulation 350, thus creating gaps 114 in rows without battery cell encapsulation 250.

[0039] It should be understood that although each embodiment of the battery cell potting compounds 54, 110, 150, 210, 250, 310, 350 is described as being used separately from other embodiments of the battery cell potting compounds 54, 110, 150, 210, 250, 310, 350 with the battery cell assembly 36, the battery pack 10 may include any combination of the embodiments of the battery cell potting compounds 54, 110, 150, 210, 250, 310, 350 disclosed herein.

[0040] While specific embodiments have been shown and described, other alternative embodiments will become apparent to those skilled in the art and are within the scope of the independent aspects of this disclosure. Various features of this disclosure are set forth in the claims.

Claims

1. A battery pack for an electrical device, the battery pack comprising: A housing that defines a cavity and includes at least one terminal configured to electrically connect the battery pack to the electrical device and a plurality of ribs extending inward toward the cavity; Multiple battery cells are disposed within the cavity of the housing and configured to supply power to the electrical device; A support structure configured to receive and support the plurality of battery cells within the cavity of the housing; A circuit board, which is disposed within the housing at the top of the support structure and includes multiple electrical components, is configured to selectively drive the multiple battery cells; as well as A battery cell potting body surrounds the plurality of battery cells and the support structure. The battery cell potting body includes a plurality of grooves that cooperate with the plurality of ribs of the housing to suppress movement of the plurality of battery cells relative to the housing.

2. The battery pack according to claim 1, wherein, The battery cell potting compound is formed from one of polyurethane, acrylic resin, epoxy resin and silicone.

3. The battery pack according to claim 1, wherein, The battery cell potting compound is formed from a combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone.

4. The battery pack according to claim 3, wherein, The combination of at least two of the polyurethane, acrylic resin, epoxy resin and silicone is a composite mixture of at least two of the polyurethane, acrylic resin, epoxy resin and silicone.

5. The battery pack according to claim 1, wherein, Each of the plurality of battery cells is a cylindrical lithium-ion battery cell.

6. The battery pack according to claim 1, wherein, The support structure includes a first end shell and a second end shell, wherein the positive electrode of each battery cell is received in one of the first end shell and the second end shell, and wherein the negative electrode of each battery cell is received in the other of the first end shell and the second end shell.

7. The battery pack according to claim 6, wherein, The plurality of battery cells are stacked in an offset manner along the height and length of the battery pack, such that the plurality of battery cells define cell rows and cell columns.

8. The battery pack according to claim 7, wherein, The battery cell encapsulation is disposed only between cell rows or only between cell columns.

9. The battery pack according to claim 1, wherein, The battery cell encapsulation also surrounds the circuit board.

10. The battery pack according to claim 7, further comprising gaps between adjacent battery cells in the plurality of battery cells.

11. The battery pack according to claim 1, wherein, The battery cell encapsulation separates the battery cells.

12. A battery pack for an electrical device, the battery pack comprising: Housing, the housing includes First shell part, The second housing portion is connected to the first housing portion. chambers, and At least one terminal, the at least one terminal being configured to electrically connect the battery pack to the electrical device; Battery cell assembly, including: Multiple battery cells are disposed within the cavity and configured to supply power to the electrical device. A support structure that receives and supports the plurality of battery cells within the cavity of the housing, and A battery cell potting compound, the battery cell potting compound surrounding the plurality of battery cells and the support structure; and A circuit board, disposed within the housing on top of the plurality of battery cells, includes a plurality of electrical components and is configured to selectively drive the plurality of battery cells. The circuit board is connected to the battery cell assembly.

13. The battery pack according to claim 12, wherein, The battery cell potting compound is formed from one of polyurethane, acrylic resin, epoxy resin and silicone.

14. The battery pack according to claim 12, wherein, The battery cell potting compound is formed from a combination of at least two of polyurethane, acrylic resin, epoxy resin, and silicone.

15. The battery pack according to claim 14, wherein, The combination of at least two of the polyurethane, acrylic resin, epoxy resin and silicone is a composite mixture of at least two of the polyurethane, acrylic resin, epoxy resin and silicone.

16. The battery pack according to claim 12, wherein, Each of the plurality of battery cells is a cylindrical lithium-ion battery cell.

17. The battery pack according to claim 12, wherein, The support structure includes a first end shell and a second end shell, wherein the circuit board is connected to at least one of the first end shell and the second end shell.

18. A method of manufacturing a battery pack for power tools, the battery pack comprising: A housing having a first housing portion and a second housing portion, the second housing portion having a plurality of ribs extending inward toward a cavity of the housing; A battery cell assembly, wherein the battery cell assembly is disposed within the cavity of the housing, the battery cell assembly having a plurality of battery cells and a support structure supporting the plurality of battery cells; The method includes: and a circuit board positioned within the housing at the top of the battery cell assembly. A battery cell potting compound is injected around the plurality of battery cells and the support structure, such that the plurality of battery cells and the support structure are connected together via the battery cell potting compound; as well as Multiple grooves are formed within the battery cell encapsulation body, and the multiple grooves are configured to receive multiple ribs of the housing; The plurality of grooves are slid along the plurality of ribs to secure the battery cell assembly within the cavity and to suppress movement of the plurality of battery cells relative to the housing.

19. The method of claim 18, further comprising forming a battery cell potting compound having a thermosetting adhesive, the battery cell potting compound providing a heat dissipation medium between the plurality of battery cells.

20. The method of claim 18, further comprising forming a plurality of gaps between adjacent battery cells in the plurality of battery cells.

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