Battery pack for supplying power to electric tool, and electric tool

Abstract

Disclosed in the present application are a battery pack for supplying power to an electric tool, and an electric tool. The battery pack comprises: a case assembly; a terminal assembly configured to be connected to a tool terminal of an electric tool so as to transmit electric energy; a battery cell module accommodated in the case assembly and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of pouch-shaped battery cell units; and a metal support member, which is configured to support the battery cell module, and has an outer surface at least partially exposed to an external environment.

Description

Battery pack for powering electric tools and electric tools

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 4, 2024, with application number 202410015188.0, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of electric energy storage technology, and in particular to a battery pack for powering an electric tool and an electric tool. Background Art

[0003] With the development of battery technology, electric tools are gradually replacing engine tools. Due to the demand for portability, more and more electric tools use battery packs as a power source.

[0004] In the prior art, battery packs for power tools often utilize cylindrical lithium-ion cells. Multiple cylindrical lithium-ion cells are connected in series or parallel to ensure sufficient power output and improve the tool's battery life. Because cylindrical lithium-ion cells typically use a rigid metal casing, the overall battery pack is relatively heavy. This forces users to overcome significant gravity to operate the tool, impacting the user experience.

[0005] This section provides background information related to the present application which is not necessarily related art. Summary of the Invention

[0006] One object of the present application is to solve or at least alleviate part or all of the above problems. To this end, one object of the present application is to provide a soft pack battery for an electric tool.

[0007] In order to achieve the above objectives, this application adopts the following technical solutions:

[0008] A battery pack for powering an electric tool comprises: a shell assembly; a terminal assembly for connecting to a tool terminal of the electric tool to transmit electrical energy; a battery cell module housed in the shell assembly and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of bag-shaped battery cell units; a metal support member configured to support the battery cell module; the metal support member having an outer surface at least partially exposed to the external environment.

[0009] In one embodiment, the shell assembly includes a first shell and a second shell; the first shell is at least arranged on the left end surface of the battery cell module, and the second shell is at least arranged on the right end surface of the battery cell module.

[0010] In one embodiment, at least one glue filling port is provided on the first shell.

[0011] In one embodiment, the battery pack further includes a first circuit board, which is disposed between the left end surface of the battery module and the first shell and is at least electrically connected to the battery unit.

[0012] In one embodiment, the shell assembly further includes a third shell, a fourth shell and a fifth shell; the third shell is at least arranged on the front end face of the battery cell module, the fourth shell is at least arranged on the rear end face of the battery cell module; the fifth shell is at least arranged on the lower end face of the battery cell module.

[0013] In one embodiment, a plurality of bag-shaped battery cell units are stacked to form a block-shaped battery cell module; a first protective member is provided between at least adjacent stacked battery cell units.

[0014] In one embodiment, a second protective member is provided at the front end and the rear end of the battery cell module respectively.

[0015] In one embodiment, a third protective member is provided at the upper end and the lower end of the battery cell module respectively.

[0016] In one embodiment, a fourth protective member is provided at the right end of the battery cell module.

[0017] In one embodiment, the metal support frame is made of at least aluminum or aluminum alloy.

[0018] A battery pack comprises: a shell assembly; a terminal assembly for connecting to the tool terminal of the power tool to transmit electrical energy; a battery cell module accommodated in the shell assembly and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of bag-shaped battery cell units; a support member configured to support the battery cell module; wherein the support member is configured as a cylindrical structure; and the cylindrical space formed by the cylindrical structure is configured to accommodate the battery cell module.

[0019] In one embodiment, a second protective member is provided at the front end and the rear end of the battery cell module, respectively, which can protect the battery cell module at least during the process of installing the battery cell module to the support member.

[0020] In one embodiment, a third protective member is provided at the upper end and the lower end of the battery cell module, respectively, which can at least protect the battery cell module during the process of installing the battery cell module to the support member.

[0021] A battery pack comprises: a shell assembly; a terminal assembly for connecting to the tool terminal of the power tool to transmit electrical energy; a battery cell module accommodated in the shell assembly and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of bag-shaped battery cell units; a support member configured to support the battery cell module; wherein a first pressure relief channel is formed on at least one wall surface of the support member facing the inner side of the battery cell module.

[0022] In one embodiment, at least one wall surface of the support member facing the inner side of the battery cell module has a plurality of baffles protruding inwardly, and the first pressure relief channel is formed between adjacent baffles.

[0023] In one embodiment, the shell assembly includes a first shell and a second shell; the first shell is at least arranged on the left end surface of the battery cell module, and the second shell is at least arranged on the right end surface of the battery cell module.

[0024] In one embodiment, a fourth protective member is provided between the second shell and the battery cell module.

[0025] In one embodiment, a second pressure relief channel is formed on a side of the second shell facing the battery cell module.

[0026] In one embodiment, the number of the first pressure relief channels and / or the second pressure relief channels is consistent with the number of the battery core units.

[0027] In one embodiment, the length of the second shell in the front-to-back direction is greater than the length of the support member; the second shell is mounted to the support member to form a pressure relief outlet of the second pressure relief channel.

[0028] An electric tool comprises: a tool body; a battery access terminal, configured to connect to a battery pack to at least power the tool body; a battery pack, comprising: a shell assembly; a terminal assembly, used to connect to the tool terminal of the electric tool to transmit electrical energy; a battery cell module, accommodated in the shell assembly and electrically connected to the terminal assembly, the battery cell module comprising at least a plurality of bag-shaped battery cell units; a support member, configured to support the battery cell module; wherein the melting point of the support member is greater than or equal to 500°C. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0030] FIG1 is a system structure diagram of a battery pack and a power tool provided in one embodiment of the present application;

[0031] FIG2 is a structural diagram of a battery pack provided by an embodiment of the present application from one perspective;

[0032] FIG3 is a structural diagram of a battery pack provided by one embodiment of the present application from another perspective;

[0033] FIG4 is an exploded view of a portion of a battery pack housing provided by one embodiment of the present application;

[0034] FIG5 is an exploded view of a battery pack housing provided by one embodiment of the present application;

[0035] FIG6 is a structural diagram of a partial structure of a battery pack provided by an embodiment of the present application from one perspective;

[0036] FIG7 is an exploded view of a portion of the internal structure of a battery pack provided by one embodiment of the present application;

[0037] FIG8 is an exploded view of a portion of the internal structure of a battery pack provided by one embodiment of the present application;

[0038] FIG9 is an exploded view of a portion of the internal structure of a battery pack provided by one embodiment of the present application;

[0039] FIG10 is a schematic diagram of a pressure relief channel in a battery pack provided by one embodiment of the present application;

[0040] FIG11 is a structural diagram of a battery cell module provided in one embodiment of the present application;

[0041] FIG12 is a schematic structural diagram of a support structure and a battery cell module provided in yet another embodiment of the present application;

[0042] FIG13 is a schematic structural diagram of a support member provided in one embodiment of the present application. DETAILED DESCRIPTION

[0043] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0044] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0045] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0046] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0047] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0048] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0049] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0050] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0051] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0052] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0053] FIG1 illustrates a power tool 20 and a battery pack 10 compatible with and powering the power tool 20. The rated voltage of the battery pack 10 can be 10V, 24V, 36V, 48V, 56V, or 80V, without limitation. The capacity of the battery pack 10 is 5Ah or greater, and can be, for example, 6Ah, 8Ah, 10Ah, etc. In FIG1 , the power tool 20 may include a riding lawn mower, a chainsaw, a lawn trimmer, an electric drill, a hair dryer, etc. However, it should be understood that the present application is not limited to the disclosed embodiments and is applicable to other types of power tools, such as power drills, pruners, and sanders. Alternatively, the power tool 20 may be a benchtop tool, such as a table saw or miter saw. Alternatively, the power tool 20 may be a push-type power tool, such as a push lawn mower or a push snow blower. Alternatively, the power tool 20 may be a ride-on power tool, such as a ride-on lawn mower, a ride-on vehicle, or an all-terrain vehicle. Alternatively, the power tool 20 may be a robotic tool, such as a robotic lawn mower or snowplow. In some embodiments, the power tool 20 may be an electric drill, electric light, or electric vehicle. In some embodiments, the power tool 20 may be a gardening tool, such as a pruner, hair dryer, lawn mower, or chainsaw. Alternatively, the power tool 20 may be a decorating tool, such as a screwdriver, nail gun, circular saw, or sander. In some embodiments, the power tool 20 may be a vegetation care tool, such as a lawn mower, lawn mower, pruner, or chainsaw. Alternatively, the power tool 20 may be a cleaning tool, such as a hair dryer, snowplow, or washer. Alternatively, the power tool 20 may be a drilling tool, such as a drill, screwdriver, wrench, or electric hammer. Alternatively, the power tool 20 may be a sawing tool, such as a reciprocating saw, jig saw, or circular saw. Alternatively, the power tool 20 may be a benchtop tool, such as a table saw, miter saw, metal cutter, or router. Alternatively, the power tool 20 may be a grinding tool, such as an angle grinder or sander. Alternatively, the electric tool 20 may also be other tools, such as a lamp, a fan, etc.

[0054] In one embodiment, the peak power density of the battery pack 10 at 10 milliohms is less than or equal to 8 W / cm 3 , that is, the peak power density of the battery pack 10 when connected to a 10 milliohm load is a maximum of 8W / cm 3 In one embodiment, the peak power density of the battery pack 10 is less than or equal to 9 W / cm at 10 milliohms. 3 , or less than or equal to 9.5W / cm 3 In one embodiment, the peak power density of the battery pack 10 is less than or equal to 6W / cm2 at 30 milliohms. 3 , or less than or equal to 7W / cm 3 wait.

[0055] 2 to 12 , the battery pack 10 includes a housing assembly 11, a terminal assembly 12, a cell module 13, and a support member 14 for supporting the cell module 13. The directions described in this application are based on the directions described in FIG.

[0056] The battery cell module 13 can be formed by stacking multiple pouch-shaped battery cells 131 to form a block or rectangular parallelepiped. Pouch-shaped battery cells 131 are commonly referred to as soft-pack batteries. The battery cells 131 can include an encapsulation to prevent leakage of the compounds within the battery cells 131. The encapsulation includes, but is not limited to, an aluminum-plastic film. In one embodiment, the battery cells 131 can be connected in series, in parallel, or both.

[0057] The housing assembly 11 may include multiple independent housings, each mounted on the cell module 13 or the support member 14 supporting the cell module 13 from different end faces to enhance the protection of the cell module 13. In one embodiment, the housing assembly 11 may also be a continuous semi-enclosed housing that accommodates the cell module 13 and the support member 14 while also exposing portions of the cell module 13 or the support member 14 to the external environment.

[0058] In this embodiment, the support member 14 can be a metal support member and has an outer surface 140 that is at least partially exposed to the external environment. Referring to Figures 3 to 5, the upper surface of the support member 14 is exposed to the external environment, which can improve the heat dissipation effect of the battery module 13. In one embodiment, the heat dissipation area of ​​the outer surface 140 is greater than or equal to 10 cm 2 , or greater than or equal to 30cm 2 , or greater than or equal to 50cm 2 , or greater than or equal to 70cm 2 , or greater than or equal to 90cm 2 , or greater than or equal to 10cm 2 , or greater than or equal to 120cm 2 , or greater than or equal to 150cm 2 , or greater than or equal to 200cm 2 wait.

[0059] In this embodiment, as shown in Figures 4 and 5, the housing assembly 11 includes a first housing 111 provided on the left end surface of the cell module 13 and a second housing 112 provided on the right end surface of the cell module 13. The first housing 111 can be fixed to the left end of the support member 14 by screws or other fasteners, and the second housing 112 can be fixed to the right end of the support member 14 by screws or other fasteners. In this embodiment, the support member 14 can be a cylindrical structure with left and right openings. The first housing 111 and the second housing 112 are respectively used to cover the openings at both ends of the cylindrical support member 14, so that the cell module 13 can be fixed in the support member 14. In this embodiment, the housing assembly 11 can also include a third housing 113 provided at the front end of the cell module 13, a fourth housing 114 provided at the rear end of the cell module 13, and a fifth housing 115 provided at the lower end of the cell module 13.

[0060] In one implementation, the first and second housings 111, 112 are first mounted to the support member 14 from the left and right directions, respectively. The fifth housing 115 is then mounted to the first and second housings 111, 112, or to the support member 14 from the top to the bottom direction. Finally, the third and fourth housings 113, 114 are mounted to the first, second, and fifth housings 111, 112, and 115 from the top to the bottom direction. In other words, the first, second, and fifth housings 111, 112, and 115 are spatially enclosed or covered. From the inside out, the housing assembly 11 includes: the first and second housings 111, 112, the fifth housing 115, the third housing 113, and the fourth housing 114. In other words, the fifth housing 115 can cover at least a portion of the first and second housings 111, 112, and the third and fourth housings 113, 114 can cover at least a portion of the first, second, and fifth housings 111, 112, and 115. This application does not impose any restrictions on the structure of the housing assembly 11 and the installation methods or installation order of different housings. The above-mentioned structure of the housing assembly 11 and the installation methods or installation order of different housings are only examples. The housing can be installed using screws, clips, glue, etc., and this application does not impose any restrictions on these methods.

[0061] In this embodiment, one or more of the first to fifth shells 111 to 115 may be made of plastic. In one embodiment, some of the shells may be made of metal, for example, the first shell 111 and / or the second shell 112 may be metal. In the event of a safety incident in the battery cell module 13, such as thermal runaway generating high-temperature, high-pressure gas or open flames, the support member 14 is a cylindrical structure, and the first shell 111 and the second shell 112 disposed at the opening of the cylindrical structure are metal, which can, to a certain extent, prevent the shells from being broken through by flames.

[0062] In this embodiment, as shown in Figure 2, the terminal assembly 12 can be mounted on the fifth housing 115. The fifth housing 115 can be recessed inward or upward to form a "U"-shaped joint, enabling the battery pack 100 to be coupled to a power tool, charger, adapter, or the like.

[0063] In this embodiment, as shown in Figure 5 , a first circuit board 15 is provided on the left end face of the cell module 13, configured to electrically connect at least to the tab 1311 of the cell unit 131. It is understood that the first circuit board 15 is actually located between the left end face of the cell module 13 and the first housing 111. As shown in Figure 6 , the first housing 111 is provided with at least one glue injection port 1111. After the first housing 111 is mounted to the support member 14, glue can be injected into the first circuit board 15 and the various electronic components and electrical interfaces thereon through the glue injection port 1111 to seal the first circuit board 15 and its associated electronic components and electrical interfaces. In one embodiment, the glue injection port 1111 is provided at the lower end of the first housing 111. In this embodiment, the glue injection port 1111 also serves as an outlet for the power cord 101 within the battery pack 100. As shown in Figures 5 and 6 , after the power cord 101 is extended from the first circuit board 15 or the cell module 13, it can be passed through the two glue injection ports 1111 to the terminal assembly 12. In this embodiment, the electrical connection between the power line 101 and the first circuit board 15 can be stabilized after glue is poured into the battery module 13 from the glue pouring port 1111 .

[0064] In this embodiment, as shown in Figures 7, 8, and 11, at least one tab support 18 is provided between the first circuit board 15 and the battery cell 131 to support the tab 1311 of each battery cell 131. The tab support 18 may be a plurality of sponge pads or other flexible components. A tab support 18 may be provided at each end of the battery cell 131 with the tab 1311, or a single tab support 18 may be used. Multiple escape openings may be provided on the tab support 18 to allow the tab of each battery cell 131 to pass through the corresponding escape openings and connect to the first circuit board 15. After passing through the first circuit board 15, the tab 1311 can be connected to the first circuit board 15 by welding. To facilitate welding, an auxiliary welding member 19 may be provided between the tab 1311 and the first circuit board 15. As shown in Figures 7 and 11, a nickel sheet or tin sheet, etc., may be provided on the left side of the first circuit board 15 as the auxiliary welding member 19.

[0065] In this embodiment, as shown in Figure 6, the terminal assembly 12 may include an output circuit board 121, a terminal seat 122 and a connecting terminal 123. The terminal seat 122 and the connecting terminal 123 are arranged on the output circuit board 121. The output circuit board 121 is electrically connected to the power cord 101 and can control the transmission of electrical energy. The terminal assembly 12 includes at least a plurality of battery terminals 121, for example, at least a positive / negative terminal and a communication terminal. The battery pack 10 outputs electrical energy to the power tool 20 through the terminal assembly 12. In other embodiments, the battery pack 10 can also be connected to a charger through the terminal assembly 12 to obtain charging power or to an adapter.

[0066] In this embodiment, as shown in FIG. 5 , the battery pack 100 may further include a main control circuit board 17 disposed at the front end of the battery cell module 13 , configured to manage the charge and discharge functions of the battery pack 100 .

[0067] Referring to Figure 7 , a metal plate 16 is further disposed between the second housing 112 and the cell module 13. This plate is provided to protect the second housing 112 from being breached by flames in the event of a safety incident such as thermal runaway of the cell module 13, or to reduce the possibility of breaching the second housing 112. In this embodiment, the metal plate 16 may be an aluminum plate and may be attached to the inside of the second housing 112 or secured to the inside of the second housing 112 by screws or other means.

[0068] In one embodiment, referring to Figure 9 , a first protective member 132 is positioned between two adjacent stacked battery cells 131. This first protective member 132 can be mica paper, mica board, or aerogel board. Mica is stable, boasting high-temperature resistance and corrosion resistance, and is commonly used in the manufacture of thermal insulation, electrical insulation, and fireproof materials. In this embodiment, the first protective member 132 provides thermal insulation, electrical insulation, and shock absorption between two adjacent battery cells 131.

[0069] Referring to Figure 8 , the support member 14 is a cylindrical structure with left and right openings. This cylindrical structure has at least four walls: front, rear, top, and bottom, forming a cylindrical space 141 to accommodate the battery module 13. In this embodiment, the support member 14 may be a metal support member, for example, made of aluminum, an aluminum alloy, or another metal or alloy. Furthermore, since the battery cells 131 are pouch cells, their surfaces are easily damaged. During the installation of the battery module 13 from the left or right opening into the cylindrical space 141, the aluminum-plastic film covering the surfaces of the battery cells 131 in the battery module 13 can be easily damaged. To prevent this, at least a second protective member 133 may be provided on the front and rear ends of the battery module 13, respectively, and a third protective member 134 may be provided on the top and bottom ends of the battery module 13, respectively. In some embodiments, a fourth protective member 135 may also be provided on the right end of the battery module 13, i.e., the end opposite the first circuit board 15. In one embodiment, the second protective member 133 , the third protective member 134 or the fourth protective member 135 may be attached to the corresponding end surface of the battery cell module 13 by adhesive or the like.

[0070] In this embodiment, the second and third protective members 133 and 134 protect the front, rear, left, and right sides of the battery module 13 to prevent friction with the inner wall of the support member 14, thereby facilitating installation of the battery module 13 within the cylindrical space 141. In one embodiment, as shown in FIG9 , the second and fourth protective members 133 and 135 may be provided with pressure relief vents 130. These vents 130 may not be positioned opposite the front, rear, or right sides of each battery cell 131. In the event of thermal runaway in a battery cell 131, high-temperature gases or flames can be discharged into the support member 14 through the pressure relief vents 130.

[0071] As shown in Figures 8 and 10, a first pressure relief channel 136 is formed on at least the front and rear inner wall surfaces of the support member 14. In one implementation, a plurality of baffles 142 protrude inwardly from the front inner wall surface and the rear inner wall surface of the support member 14, and the first pressure relief channel 136 is formed between adjacent baffles 142. In other embodiments, the baffles 142 can also be detachably mounted on the front inner wall surface and the rear inner wall surface of the support member 14. It is understandable that the first pressure relief channel 136 can be arranged opposite to the pressure relief port 130 on the second protective member 133, that is, the gas or open flame coming out of the pressure relief port 130 on the second protective member 133 can enter the first pressure relief channel 136.

[0072] As shown in Figure 7, a second pressure relief channel 137 may also be formed on the inner side of the second housing 112, i.e., the side facing the battery module 13. In one implementation, the second housing 112 has a plurality of continuous or discontinuous bars 1121 protruding inwardly, with the second pressure relief channel 137 formed between adjacent bars 1121. It will be appreciated that the second pressure relief channel 137 may be positioned opposite the pressure relief port 130 on the fourth protective member 135, meaning that gas or open flames exiting the pressure relief port 130 on the fourth protective member 135 can enter the second pressure relief channel 137.

[0073] In one embodiment, the plurality of first pressure relief channels 136 may be respectively provided with the plurality of second pressure relief channels 137 , that is, the first pressure relief channels 136 may also be connected to the second pressure relief channels 137 . The gas or flame passing through the first pressure relief channels 136 may enter the second pressure relief channels 137 .

[0074] In one embodiment, the number of the first pressure relief channels 136 and / or the second pressure relief channels 137 may be consistent with the number of the battery cells 131. That is, each battery cell 131 may correspond to one pressure relief channel.

[0075] In this embodiment, as shown in FIG10 , the length D1 of the second shell 112 in the front-to-back direction is greater than the length D2 of the support member 14 , and a pressure relief outlet 1371 of the second pressure relief channel 137 can be formed after the second shell 112 is mounted to the support member 14 . In FIG10 , the thick arrow line indicates the pressure relief path L formed by the first pressure relief channel 136 , the second pressure relief channel 137 , and the pressure relief outlet 1371 . After any one or more battery cells 131 in the battery cell module 13 experience thermal runaway, the presence of the first protective member 132 avoids or reduces the impact on other adjacent battery cells 131 . In addition, the second protective member 133 and the fourth protective member 135 can guide high-temperature gas or open flame along the pressure relief path L shown in FIG10 to discharge from the battery pack 10 .

[0076] In one embodiment, as shown in FIG12 , the support member 14 may further include multiple partitions 143 within it. The space between adjacent partitions 143 is configured to accommodate a single battery cell 131. In this embodiment, the partitions 143 may be integrally formed with the support member 14 or removably mounted within the support member 14. In one embodiment, the partitions 143 may be mica sheets, metal sheets such as steel or aluminum sheets, or thin sheets formed from materials with high thermal insulation and flame retardant properties. In the event of thermal runaway or other safety incidents in a battery cell 131, the partitions 143 provide a barrier to prevent interference with other adjacent battery cells 131. Continuing with FIG12 , the connecting tabs 1312 of the tabs 1311 of adjacent battery cells 131 form fuses 1312a, which can be blown if the battery pack 10 or the battery module 13 overheats. In one embodiment, the fuses 1312a may be formed at the thinnest point of the connecting tabs 1312.

[0077] In this embodiment, the melting point of the support member 14 is greater than or equal to 400° C., or greater than or equal to 500° C., etc. In this embodiment, the metal support member 14 and / or the partition 143 therein and / or the various protective members on the outside of the battery module 13 can effectively suppress thermal expansion of the battery cells 131 in the battery module 13.

[0078] In this embodiment, referring to Figure 8 or Figure 10, the battery module 13 is composed of a first battery module 1301 and a second battery module 1302 connected in series. The cylindrical space 141 formed by the support member 14 includes a first space 1411 and a second space 1412. Among them, the first battery module 1301 is arranged in the first space 1411, and the second battery module 1302 is arranged in the second space 1412. In other embodiments, the battery module 13 can be composed of multiple groups of battery modules connected in series, for example, it can be composed of three groups, or four groups, or five groups of battery modules. Accordingly, the support member 14 can be divided into a corresponding number of spaces according to the number of battery modules that make up the battery module 13 to accommodate one battery module respectively. As shown in Figure 13, the support member 14 can be divided into four independent spaces to accommodate four battery modules. In one implementation, a partition 143 can be used to divide the multiple spaces.

[0079] In one embodiment, the arrangement of the battery cells 131 that make up each battery module can be the same or different. For example, in Figure 8 , the battery cells 131 that make up the first battery module 1301 are arranged horizontally or vertically, while the battery cells 131 that make up the second battery module 1302 are arranged vertically or horizontally. In one embodiment, the arrangement of each battery module within its corresponding accommodation space can be the same or different. For example, in Figure 8 , the first battery module 1301 can be arranged horizontally or vertically within the first space 1411, while the second battery module 1302 can be arranged horizontally or vertically within the second space 1412. Alternatively, the battery cells 131 that make up the first battery module 1301 can be arranged horizontally or vertically, while the battery cells 131 that make up the second battery module 1302 can be arranged horizontally or vertically. The terms "horizontally" or "vertically" refer to different relative orientations within the same coordinate system and do not necessarily refer to the strict meaning of horizontal or vertical.

[0080] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A battery pack for powering an electric tool, comprising: Shell assembly; A terminal assembly, used to connect to a tool terminal of the electric tool to transmit electric energy; A battery cell module, contained in the housing assembly and electrically connected to the terminal assembly, wherein the battery cell module comprises at least a plurality of bag-shaped battery cell units; A metal support member, configured to support the battery cell module; The metal support has an outer surface at least partially exposed to the external environment.

2. The battery pack according to claim 1, wherein, The shell assembly includes a first shell and a second shell; the first shell is at least arranged on the left end surface of the battery cell module, and the second shell is at least arranged on the right end surface of the battery cell module.

3. The battery pack according to claim 2, wherein, At least one glue filling port is arranged on the first shell. 4 . The battery pack according to claim 2 , further comprising a first circuit board, disposed between a left end surface of the battery cell module and the first shell, and at least electrically connected to the battery cell unit.

5. The battery pack according to claim 1, wherein, The shell assembly also includes a third shell, a fourth shell and a fifth shell; the third shell is at least arranged on the front end surface of the battery cell module, the fourth shell is at least arranged on the rear end surface of the battery cell module; the fifth shell is at least arranged on the lower end surface of the battery cell module.

6. The battery pack according to claim 1, wherein, A plurality of bag-shaped battery cell units are stacked to form a block-shaped battery cell module; a first protective member is provided between at least adjacent stacked battery cell units.

7. The battery pack according to claim 1, wherein, The front end and the rear end of the battery module are respectively provided with second protective components.

8. The battery pack according to claim 1, wherein, The upper end and the lower end of the battery module are respectively provided with a third protective member.

9. The battery pack according to claim 1, wherein, A fourth protective component is provided at the right end of the battery cell module.

10. The battery pack according to claim 1, wherein, The metal support frame is made of at least aluminum or aluminum alloy.

11. A battery pack comprising: Shell assembly; A terminal assembly, used to connect to a tool terminal of the electric tool to transmit electric energy; A battery cell module, contained in the housing assembly and electrically connected to the terminal assembly, wherein the battery cell module comprises at least a plurality of bag-shaped battery cell units; A support member, configured to support the battery cell module; Wherein, the support member is configured as a cylindrical structure; the cylindrical space formed by the cylindrical structure is configured to accommodate the battery cell module.

12. The battery pack according to claim 11, wherein, The front end and the rear end of the battery cell module are respectively provided with second protective members, which can at least protect the battery cell module during the process of installing the battery cell module to the support member.

13. The battery pack according to claim 11, wherein, The upper end and the lower end of the battery cell module are respectively provided with a third protective member, which can at least protect the battery cell module during the process of installing the battery cell module to the support member.

14. A battery pack comprising: Shell assembly; A terminal assembly, used to connect to a tool terminal of the electric tool to transmit electric energy; A battery cell module, contained in the housing assembly and electrically connected to the terminal assembly, wherein the battery cell module comprises at least a plurality of bag-shaped battery cell units; A support member, configured to support the battery cell module; Wherein, a first pressure relief channel is formed on at least one wall surface of the support member facing the inner side of the battery cell module.

15. The battery pack according to claim 14, wherein, At least one wall surface of the support member on the inner side facing the battery core module has a plurality of baffles protruding inwardly, and the first pressure relief channel is formed between adjacent baffles.

16. The battery pack according to claim 14, wherein, The housing assembly includes a first housing and a second housing; the first housing is disposed at least on the left end face of the battery cell module, and the second housing is disposed at least on the right end face of the battery cell module.

17. The battery pack according to claim 16, wherein, A fourth protective member is provided between the second housing and the battery cell module.

18. The battery pack according to claim 16, wherein, A second pressure relief passage is formed on a side of the second housing facing the battery cell module.

19. The battery pack according to claim 18, wherein, The number of the first pressure relief passage and / or the second pressure relief passage is consistent with the number of the battery cell units.

20. The battery pack according to claim 18, wherein, In the front-back direction, the length of the second housing is greater than the length of the support member; the second housing is mounted to the support member to form a pressure relief outlet of the second pressure relief passage.

21. A power tool, comprising: A tool body; A battery access end configured to access a battery pack to supply power to at least the tool body; A battery pack, comprising: A housing assembly; A terminal assembly configured to connect to a tool terminal of the power tool to transmit electric energy; A battery cell module received in the housing assembly and electrically connected to the terminal assembly, the battery cell module at least includes a plurality of pouch-shaped battery cell units; A support member configured to support the battery cell module; Wherein, the melting point of the support member is greater than or equal to 500 °C.

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