Battery pack and electric device

Abstract

The utility model relates to the technical field of energy storage devices, and particularly discloses a battery pack and a power utilization device, and the battery pack comprises a bracket, a battery cell, a battery management system board and a supporting piece. Wherein the support is provided with a containing groove, and a groove opening of the containing groove is located in one end of the support; the battery cell is arranged in the accommodating groove; the battery management system board is arranged in the accommodating groove, the battery management system board is electrically connected with the battery cell, and a cavity is formed among the inner wall of the bracket, the battery cell and the battery management system board; the supporting piece is arranged in the cavity and is fixedly connected with the inner wall of the bracket, the battery cell and the battery management system board respectively. According to the battery pack, the support, the battery cell and the battery management system board are connected into a whole through the supporting piece, the mechanical safety of the battery pack is improved, and the battery pack is particularly suitable for being matched with electric tools under the use working conditions of high vibration, falling risks and the like. In addition, the supporting piece can be formed by directly injecting glue into the support, a specific glue injection tool does not need to be used, the assembly process is simplified, and the production difficulty is reduced.

Description

Technical Field

[0001] This application relates to the field of energy storage device technology, and more specifically, to a battery pack and an electrical device. Background Technology

[0002] A battery is a device that generates electrical energy. Using batteries as an energy source, they offer stable voltage and current, provide stable power for extended periods, are less affected by external factors, and are easy to charge and discharge. Therefore, they are commonly used to power external devices such as mobile phones, tablets, laptops, and other portable or mobile electronic devices.

[0003] Currently, with the increasing trend towards cordless power tools, batteries are finding wider application in these products. The development trend of modern power tools is towards high performance, compact size, lightweight design, long battery life, and extended lifespan. Soft-pack polymer batteries offer advantages such as high charge / discharge rates, high energy density, long cycle life, and relatively lower weight compared to cylindrical or prismatic metal-cased cells. Therefore, the trend of soft-pack polymer batteries replacing cylindrical cells in power tool batteries is becoming increasingly apparent.

[0004] However, soft-pack polymer cells have low mechanical properties, large dimensional tolerances, easily broken cell tabs, and easily cracked aluminum-plastic films. Therefore, special processes are required when packaging them into battery packs so that the battery packs can withstand high-frequency vibrations during power tool operation and drops from heights. For example, glue is injected into the head and sides of the cells using specific injection fixtures, but this is difficult to produce and prone to problems such as glue overflow. Utility Model Content

[0005] In view of this, the purpose of this application is to provide a battery pack and an electrical device, the structural design of which can effectively solve the problems of complex battery pack assembly process and high production difficulty.

[0006] To achieve the above objectives, this application provides the following technical solution:

[0007] A battery pack, comprising:

[0008] The bracket is provided with a receiving groove, the opening of which is located at one end of the bracket;

[0009] The battery cell is disposed within the receiving groove;

[0010] A battery management system board is disposed in the receiving groove. The battery management system board is electrically connected to the battery cell. A cavity is formed between the inner wall of the bracket, the battery cell, and the battery management system board.

[0011] A support member is disposed within the cavity, and the support member is fixedly connected to the inner wall of the bracket, the battery cell, and the battery management system board, respectively.

[0012] Optionally, in the above battery pack, the battery management system board is located at the end of the battery cell facing the slot, and there is a gap between the edge of the battery management system board and the inner wall of the bracket, and / or, the battery management system board is provided with a through hole, the cavity includes the gap and / or the through hole, and the cavity also includes an internal cavity located at the end of the battery management system board away from the slot, the internal cavity communicating with the slot through the gap and / or the through hole;

[0013] The support member includes a connecting portion and a first main body portion. The first main body portion is disposed in the internal cavity. The connecting portion is connected to the first main body portion and is disposed in the gap and / or the through hole.

[0014] Optionally, in the above-mentioned battery pack, the edge of the battery management system board is provided with at least one notch, and the gap is formed between the side wall of the battery management system board surrounding the notch and the inner wall of the bracket.

[0015] Optionally, in the battery pack described above, the four side walls of the first main body are connected to the inner side wall of the bracket, one end of the first main body facing the slot is connected to the battery management system board, and the other end is connected to the battery cell.

[0016] Optionally, in the above-mentioned battery pack, the cavity further includes an outer cavity formed by the inner wall of the bracket and the battery management system board. The outer cavity is located at the end of the battery management system board facing the slot. The support member further includes a second main body portion, which is disposed in the outer cavity. The communicating portion is connected to the second main body portion. The four side walls of the second main body portion are connected to the inner wall of the bracket. The end of the second main body portion away from the slot is connected to the battery management system board.

[0017] Optionally, in the above-mentioned battery pack, the support member is a plastic part.

[0018] Optionally, in the above-mentioned battery pack, the bracket is an integral bracket and is closed around the slot, and the cavity is connected to the slot.

[0019] Optionally, in the above-mentioned battery pack, the inner wall of the bracket is provided with a support portion, and the battery management system board abuts against the end of the support portion facing the slot.

[0020] Optionally, in the battery pack described above, the inner wall of the bracket is provided with a groove, one end of the groove is open and extends to the slot opening, and the opposite end wall of the groove forms the support portion; the edge of the battery management system board is provided with a protrusion, the protrusion is located in the groove and abuts against the support portion.

[0021] Optionally, in the above-mentioned battery pack, the support portions are respectively provided on opposite sides of the bracket, and the opposite sides of the battery management system board abut against the corresponding support portions.

[0022] Optionally, in the above-mentioned battery pack, at least one set of battery cell assemblies is provided in the receiving slot, the battery cell assembly includes multiple stacked battery cells, and each battery cell has a tab at its head end;

[0023] The battery pack further includes a connecting plate disposed in the receiving slot. The connecting plate is provided with a plurality of electrode connection parts. Each of the battery cells is connected to the corresponding electrode connection part through the electrode. The first and last two electrode connection parts are electrically connected to the battery management system board, respectively. Alternatively, each of the battery cells is connected to the corresponding two electrode connection parts through the electrode. The two electrode connection parts are electrically connected to the battery management system board, respectively.

[0024] The electrode tab and the electrode tab connection portion are disposed within the support member.

[0025] Optionally, in the above-mentioned battery pack, the head end of each of the stacked cells faces the slot, and the connecting plate is disposed between the head end of each of the cells and the battery management system board.

[0026] Optionally, in the above-mentioned battery pack, the connecting plate is provided with a metal sheet, one end of which is electrically connected to the electrode connection part, and the other end is electrically connected to the battery management system board.

[0027] Optionally, the battery pack further includes a first housing and a second housing, the first housing being connected to the second housing, and the bracket being disposed in the cavity formed by the first housing and the second housing.

[0028] The battery pack provided in this application includes a bracket, battery cells, a battery management system board, and supporting components. The bracket has a receiving groove with its opening located at one end. The battery cells are housed within the receiving groove. The battery management system board is also housed within the receiving groove and is electrically connected to the battery cells. A cavity is formed between the inner wall of the bracket, the battery cells, and the battery management system board. The supporting components are housed within the cavity and are fixedly connected to the inner wall of the bracket, the battery cells, and the battery management system board.

[0029] The battery pack provided in this application utilizes a bracket to house both the battery cells and the battery management system board within the bracket's receiving slot. A support member is housed within the cavity formed by the bracket, the battery cells, and the battery management system board, connecting the bracket, battery cells, and battery management system board into a single unit. On one hand, the connection between the battery cells and the battery management system board and the bracket via the support member enhances the mechanical safety of the battery pack, making it particularly suitable for use with power tools operating under conditions of high vibration, drop risk, and high humidity. On the other hand, the support member can be molded directly by injecting adhesive into the bracket, eliminating the need for specific injection tooling, simplifying the assembly process and reducing production difficulty.

[0030] To achieve the above objectives, this application also provides an electrical device comprising any of the aforementioned battery packs. Since the aforementioned battery packs possess the aforementioned technical effects, the electrical device comprising the aforementioned battery pack should also possess the corresponding technical effects. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a battery pack according to a specific embodiment of this application;

[0033] Figure 2 for Figure 1 A schematic diagram of the exploded structure;

[0034] Figure 3 for Figure 1 Front view diagram;

[0035] Figure 4 for Figure 3 Schematic diagram of AA section;

[0036] Figure 5 for Figure 4 Enlarged diagram of part A in the middle;

[0037] Figure 6 This is a schematic diagram of the battery pack in this application without supporting components.

[0038] Figure 7 for Figure 6 A top-down view;

[0039] Figure 8 for Figure 7 Enlarged diagram of part A in the middle;

[0040] Figure 9 for Figure 7 Schematic diagram of AA section;

[0041] Figure 10 for Figure 9 Enlarged schematic diagram of part A in the middle;

[0042] Figure 11 This is a schematic diagram of a set of battery cell components in this application;

[0043] Figure 12 This is a schematic diagram showing the arrangement of the two sets of battery cell components in this application;

[0044] Figure 13 This is a schematic diagram of the assembly of the battery cell assembly and the connecting board in this application;

[0045] Figure 14 This is a schematic diagram of the connecting plate in this application;

[0046] Figure 15 This is a schematic diagram of the assembly of the battery cell assembly, the connecting board, and the battery management system board in this application;

[0047] Figure 16 This is a side view of the assembly of the cell assembly, connecting board, and battery management system board in this application;

[0048] Figure 17 This is a schematic diagram of the battery pack structure according to another specific embodiment of this application;

[0049] Figure 18 for Figure 17 A schematic diagram of the explosion structure.

[0050] Figure label:

[0051] 1-Bracket; 2-Cell assembly; 3-Battery management system board; 4-Support component; 5-Connecting plate; 6-First housing; 7-Second housing; 8-Output module; 9-Light guide assembly;

[0052] 101-Accommodation groove; 102-Gate opening; 11-Inner wall of the bracket; 12-Cavity; 121-Internal cavity; 122-Gap; 123-External cavity; 13-Support part; 103-Groove;

[0053] 21-Battery cell; 22-Electrical tab;

[0054] 31-Notch; 32-Protrusion; 33-Connector with wire; 34-Pin header and socket; 35-Connector;

[0055] 41-Connecting part; 42-First main body part; 43-Second main body part;

[0056] 51-Electrode connection part; 511-General positive connection part; 512-General negative connection part; 513-Intermediate connection part; 52-Metal sheet. Detailed Implementation

[0057] This application discloses a battery pack and an electrical device to improve the mechanical protection performance of the battery pack, simplify the assembly process of the battery pack, and reduce the production difficulty.

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] The battery provided in this application is suitable for powering electrical devices, especially power tools, such as those operating under conditions of high vibration, risk of drop, or high humidity. To meet the mechanical performance requirements of the battery pack and reduce manufacturing complexity, the battery pack provided in this application uses a bracket outside the battery cells, and houses the Battery Management System (BMS) board within the bracket. The BMS board monitors the batteries to intelligently manage and maintain each battery cell, preventing overcharging and over-discharging, and extending battery life. Unlike conventional applications where the BMS board is installed separately outside the battery pack, this application places the BMS board within the bracket, and provides a support component within the bracket. This support component fills the gaps between the bracket, the battery cells, and the BMS board. Alternatively, the support component can fill all gaps between the bracket and the battery cells and BMS board, or only some gaps, such as those near the slots on the bracket. The support components are connected to the bracket, battery cell, and battery management system board respectively, thus integrating the three into one unit, improving the mechanical protection performance of the battery pack, simplifying the assembly process, and reducing production difficulty.

[0060] In some embodiments, please refer to Figures 1-6The battery pack provided in this application includes a bracket 1, a battery cell 21, a battery management system board 3, and a support member 4. The bracket 1 has a receiving groove 101, with the opening 102 of the receiving groove 101 located at one end of the bracket 1. The shape of the receiving groove 101 can be appropriately set according to the shape and layout of the battery cell 21 and the battery management system board 3 to accommodate the battery cell 21 and the battery management system board 3 within the receiving groove 101. The opening 102 of the receiving groove 101 is located at one end of the bracket 1, allowing the battery cell 21 and the battery management system board 3 to be inserted into the receiving groove 101 through the opening 102 during assembly. The shape of the bracket 1 can be set as needed and is not specifically limited here. For example, the bracket 1 is box-shaped, such as a box with a rectangular cross-section. The battery cell 21 is disposed within the receiving groove 101, and the battery cell 21 can be a pouch cell. When using a pouch cell, the bracket 1 can be a rigid bracket to provide support and protection for the pouch cell, increasing its mechanical properties. Meanwhile, the bracket 1 is also used to place and fix the battery management system board 3. The battery management system board 3 is disposed in the receiving groove 101 and is electrically connected to the battery cell 21. The relative position of the battery management system board 3 and the battery cell 21 can be set as needed to ensure a reliable electrical connection between the battery management system board 3 and the battery cell 21. A cavity 12 is formed between the inner wall 11 of the bracket 1, the battery cell 21, and the battery management system board 3. It can be understood that the battery cell 21 and the battery management system board 3 are both disposed in the bracket 1, and at least two of the following are provided: between the battery cell 21 and the inner wall 11 of the bracket 1, between the battery management system board 3 and the inner wall 11 of the bracket 1, and between the battery cell 21 and the battery management system board 3. These gaps are interconnected to form the cavity 12. It should be noted that the support member 4 disposed in the cavity 12 includes both the support member 4 filling the cavity 12 completely and the support member 4 partially filling the cavity 12. The support member 4 is fixedly connected to the inner wall 11 of the bracket 1, the battery cell 21, and the battery management system board 3, respectively. The support member 4 can be molded into the cavity 12 by injection and curing, such as by glue injection molding, or it can be set into the cavity 12 by other methods. For ease of explanation, the following embodiments take the support member 4 being molded into the cavity 12 by glue injection as an example.

[0061] The battery pack provided in this application, by setting a bracket 1 and placing the battery cell 21 and battery management system board 3 within the receiving groove 101 of the bracket 1, and utilizing the cavity 12 formed by the bracket 1 itself, the battery cell 21, and the battery management system board 3, houses the support member 4 within the cavity 12, and the support member 4 connects the bracket 1, the battery cell 21, and the battery management system board 3 into a whole. On one hand, the battery cell 21 and the battery management system board 3 are connected to the bracket 1 as a whole through the support member 4, improving the mechanical safety of the battery pack, especially suitable for power tools operating under conditions of high vibration, drop risk, and high humidity. On the other hand, the support member 4 can be formed by directly injecting glue into the bracket 1, without the need for specific glue injection tooling or other fixing measures, simplifying the assembly process, making operation simple, and reducing production difficulty.

[0062] In some embodiments, please refer to the following: Figures 3-9 The battery management system board 3 is located at the end of the cell 21 facing the slot 102. A gap 122 exists between the edge of the battery management system board 3 and the inner wall 11 of the bracket 1. The cavity 12 includes the gap 122 and also includes an internal cavity 121 located at the end of the battery management system board 3 away from the slot 102. The internal cavity 121 communicates with the slot 102 through the gap 122. Please refer to [link / reference]. Figures 3-5 The support member 4 includes a connecting portion 41 and a first main body portion 42. The first main body portion 42 is disposed in the internal cavity 121, and the connecting portion 41 is connected to the first main body portion 42 and disposed in the gap 122. The support member 4 is specifically an integral structure, such as by injection molding. The connecting portion 41 is connected to the inner wall 11 of the bracket 1 and the battery management system board 3 respectively, and the first main body portion 42 is connected to at least the battery cell 21, thereby connecting the bracket 1, the battery cell 21 and the battery management system board 3 into one unit. In this embodiment, the battery management system board 3 is positioned at the end of the cell 21 near the slot 102, and the gap 122 between the battery management system board 3 and the inner wall of the bracket 1 serves as part of the cavity 12 for mounting the support member 4. During the injection molding of the support member 4, this gap 122 is used for injection; the adhesive can be injected through the gap 122 from one end of the slot 102 towards the end of the battery management system board 3 away from the slot 102, i.e., towards the bottom of the receiving groove 101, thus entering the internal cavity 121. The gap 122 connects the opposite ends of the battery management system board 3, facilitating the molding of the support member 4.

[0063] Specifically, during glue injection, glue can be poured directly into the inner wall 11 of the bracket 1 from the gap 122. Compared with other conventional battery glue injection methods, the operation is simple, it is convenient to observe the glue injection effect and replenish glue, and it avoids the problems of insufficient glue and glue overflow, thus ensuring the glue injection effect.

[0064] For example, the battery management system board 3 has gaps 122 around its four edges. This can be understood as including both multiple gaps 122 spaced apart around the four edges of the battery management system board 3 and a single annular gap 122 around its four edges. Multiple gaps 122 or a single annular gap 122 allow for glue injection in all four directions, improving injection efficiency and allowing observation of the injection effect and replenishment from all sides. This better avoids problems of incomplete glue application and overflow, further ensuring the glue filling effect.

[0065] For some specific examples, please refer to Figures 6-11 The battery management system board 3 has at least one notch 31 on its edge, and the gap 122 is formed between the side wall of the battery management system board 3 surrounding the notch 31 and the inner wall 11 of the bracket 1. It is understood that the notch 31 should penetrate the thickness direction of the battery management system board 3 along the groove 102 to the bottom of the groove, thereby communicating the groove 102 with the internal cavity 121. By providing a notch 31 on the edge of the battery management system board 3 to form the gap 122, the inner wall 11 of the bracket 1 can be set as a flat surface, thereby facilitating the forming of the bracket 1. The shape and size of the notch 31 can be set as needed, and are not specifically limited here, but should not affect the normal function of the battery management system board 3. For example, the battery management system board 3 has multiple notches 31 around its perimeter. In other embodiments, a recessed area can also be provided on the inner wall 11 of the bracket 1 to form the gap 122 with the battery management system board 3.

[0066] In some embodiments, the battery management system board 3 is provided with a through hole, and the cavity 12 includes the through hole. The internal cavity 121 communicates with the slot 102 through the through hole, and the connecting part 41 is provided in the through hole. Unlike the above embodiment, which uses the gap 122 between the battery management system board 3 and the inner sidewall of the bracket 1 as part of the cavity 12, in this embodiment, the through hole on the battery management system board 3 is used as part of the cavity 12 to house the support member 4. When the support member 4 is molded by injection molding, the through hole can be used for injection molding. The adhesive can be injected from one end of the slot 102 into the end of the battery management system board 3 away from the slot 102 through the through hole, that is, injected towards the bottom of the receiving slot 101, thereby injecting into the internal cavity 121. It can be understood that the through hole here is different from the notch 31 mentioned above in that the notch 31 is provided at the edge of the battery management system board 3, while the through hole is provided inside the battery management system board 3 and does not communicate with the four edges of the battery management system board 3. Similarly, the shape and size of the through holes can be set as needed, and there are no specific limitations here. Of course, it should not affect the normal function of the battery management system board 3.

[0067] In some embodiments, please refer to Figure 5The four sides of the first main body 42 are connected to the inner sidewall of the bracket 1. One end of the first main body 42 facing the slot 102 is connected to the battery management system board 3, and the other end is connected to the battery cell 21. When the first main body 42 fills the internal cavity 121, a part of the wall surface of the first main body 42 contacts and connects to the inner sidewall of the bracket 1, another part of the wall surface contacts and connects to the battery cell 21, and yet another part of the wall surface contacts and connects to the battery management system board 3. That is, the first main body 42 connects the bracket 1, the battery cell 21, and the battery management system board 3 into one unit. Combined with the connecting function of the connecting part 41, the overall structure is more stable and has higher mechanical reliability.

[0068] In some specific examples, buffer layers are provided between the side wall of the middle part of the battery cell 21 and the inner wall 11 of the bracket 1, and between the front and back sides of the middle part of the battery cell 21 and the inner wall 11 of the bracket 1. Therefore, the gap 122 formed between the battery cell 21 and the inner wall 11 of the bracket 1 at the buffer layer is small, and the flow rate of the adhesive is slow during injection. Therefore, the adhesive can be concentrated at the head of the battery cell 21 near the slot 102 during injection, and the first main body 42 may not be provided at the bottom end of the battery cell 21 away from the slot 102. Figure 4 As shown, the tabs 22 of the battery cell 21 can be located at the head, thus achieving effective protection of the head of the battery cell 21 while reducing the amount of adhesive, which helps to save costs.

[0069] In some embodiments, please refer to Figure 3 , Figure 6 and Figure 9 The cavity 12 also includes an outer cavity 123 formed by the inner wall 11 of the bracket 1 and the battery management system board 3. The outer cavity 123 is located at the end of the battery management system board 3 facing the slot 102. The support member 4 also includes a second main body 43, which is disposed in the outer cavity 123. The connecting part 41 is connected to the second main body 43. The four sides of the second main body 43 are connected to the inner wall 11 of the bracket 1, and the end of the second main body 43 away from the slot 102 is connected to the battery management system board 3. The outer cavity 123 and the inner cavity 121 are connected through a gap 122 or a through hole. Correspondingly, the first main body 42 and the second main body 43 are connected through the connecting part 41. The second main body 43 is connected to the inner side wall of the bracket 1 and the battery management system board 3 respectively, further enhancing the stability and reliability of the overall structure. Meanwhile, the second main body 43 can achieve sealing between the battery management system board 3 and the bracket 1, as well as sealing of the battery management system board 3, meeting the waterproof and dustproof protection requirements of the components on the battery management system board 3, eliminating the need for additional protective treatments such as conformal adhesive on the battery management system board 3. For example, the height of the second main body 43 is set accordingly based on the height of the components on the battery management system board 3 to meet the protection requirements of the relevant components. The height of the second main body 43 refers to the distance from the end of the second main body 43 in contact with the battery management system board 3 to one end of the slot 102.

[0070] In some embodiments, the support member 4 is a plastic part. Plastic parts are lightweight, chemically stable, have excellent electrical insulation properties, good thermal insulation properties, and high mechanical strength. Specifically, the plastic part can be injection molded into the cavity 12.

[0071] In some embodiments, the bracket 1 is an integral bracket and is closed around the perimeter of the slot 102, with the cavity 12 communicating with the slot 102 of the receiving groove 101. Adhesive can be injected into the cavity 12 through the slot 102 to form the support member 4. With this configuration, adhesive can be directly injected into the cavity 12 through the slot 102. The sidewalls of the bracket 1 are seamless. Compared to conventional adhesive injection processes, where gaps exist between the tooling and the workpiece, causing adhesive overflow during injection, the seamless sidewalls of the bracket 1 in this application avoid this overflow problem, thus ensuring the effective adhesive injection.

[0072] In some embodiments, please refer to Figure 9 and Figure 10 The inner wall 11 of the bracket 1 is provided with a support portion 13, and the battery management system board 3 abuts against the end of the support portion 13 facing the slot 102. By providing the support portion 13 on the inner wall 11 of the bracket 1, when the battery management system board 3 is placed in the receiving slot 101, the support portion 13 can support and limit the battery management system board 3, so that it is relatively stable in the receiving slot 101, which facilitates subsequent glue injection operations. The shape of the support portion 13 can be set as needed. For example, the support portion 13 is a plane that contacts the surface of the battery management system board 3, with a large contact area, resulting in good stability of the battery management system board 3.

[0073] In some specific examples, the support portion 13 is located at one end of the cell 21 near the slot 102, and there is a gap between the support portion 13 and the cell 21, so that the battery management system board 3 abuts against the support portion 13 and can be spaced from the cell 21 to form the support member 4 therein.

[0074] In some embodiments, please refer to Figures 7-10The inner wall of the bracket 1 has a groove 103. One end of the groove 103 is open and extends to the slot 102. The opposite end wall of the groove 103 forms a support portion 13. The edge of the battery management system board 3 has a protrusion 32, which is located in the groove 103 and abuts against the support portion 13. It can be understood that the protrusion 32 protrudes along the extending direction of the battery management system board 3. The side wall of the side wall surrounding the groove 103, which is opposite to the slot 102 of the receiving groove 101, serves as the support portion 13. The opposite side of the groove 103 is open to facilitate the insertion of the battery management system board 3. The bottom 1031 of the groove 103 is opposite to the outer wall of the battery management system board 3. A gap may be provided between the two to fill the support member 4, or the two may be fitted together. By providing a groove 103 on the inner sidewall of the bracket 1 to avoid misalignment, and providing a protrusion 32 on the edge of the battery management system board 3, the protrusion 32 is located within the groove 103 and abuts against the sidewall of the groove 103 opposite to the opening 102 of the receiving groove 101. This sidewall serves as the support part 13. With the initial positioning of the groove 103 and the support of the support part 13, the battery management system board 3 achieves initial positioning and installation, and can then be fixed to the bracket 1 by subsequent glue injection. The support part 13 adopts the above-described configuration, which has a simple structure and is easy to mold.

[0075] In some specific examples, the bracket 1 has support portions 13 on opposite sides, and the battery management system board 3 abuts against the corresponding support portions 13 on opposite sides. Supporting and limiting the battery management system board 3 from opposite sides results in more stable force distribution, and compared to supporting the battery management system board 3 from one side, the smaller support area of ​​the support portion 13 allows for stable initial installation. When the support portion 13 is located on the sidewall of the groove 103, the bracket 1 has grooves 103 on opposite sides, and the battery management system board 3 has at least one protrusion 32 corresponding to each groove 103. For example, two protrusions 32 are provided corresponding to each groove 103, spaced apart. The aforementioned notch 31 is formed between the two protrusions 32. This configuration results in a compact structure for the battery management system board 3, achieving full utilization of space.

[0076] In some embodiments, please refer to Figures 11-14The receiving groove 101 contains at least one set of battery cell assembly 2, which includes multiple stacked battery cells 21, each with a tab 22 at its head end. The battery pack also includes a connecting plate 5 within the receiving groove 101, which has multiple tab connection portions 51. Each battery cell 21 is connected to a corresponding tab connection portion 51 via a tab 22. The first and last tab connection portions 51 are electrically connected to the battery management system board 3, or each battery cell 21 is connected to two corresponding tab connection portions 51 via a tab 22, and the two tab connection portions 51 are electrically connected to the battery management system board 3. The tabs 22 and tab connection portions 51 are located within a support member 4. Because the tabs 22 are easily broken, placing them within the support member 4 provides good protection for the tabs 22, preventing breakage and ensuring reliable electrical connections. At least one set of battery cell assembly 2 is provided within the bracket 1. Figure 11 The image shows a set of battery cell assembly 2. Figure 12 The diagram shows two sets of battery cell assemblies 2. The example shown uses six cells 21 as a group for reference only; however, multiple cells 21 can be stacked in any series-parallel configuration as needed. The battery cell assembly 2 includes multiple cells 21; in this application, "multiple" refers to two or more. Multiple cells 21 working together can provide a larger battery capacity, thereby increasing the battery pack's capacity and extending its service life. Each cell 21 has tabs 22, specifically the end of the cell 21 extending beyond the tab 22 is referred to as the head end. The tabs 22 are electrically connected to the cell 21. The tabs 22 connected to the cell 21 are respectively designated as positive and negative tabs. For example, there may be two tabs 22, one positive and one negative. Alternatively, there may be more than two tabs 22; for example, one end of the cell 21 may be connected to three tabs 22, one positive and the other two negative tabs connected in parallel.

[0077] The connecting plate 5 is used to connect each cell 21 in the cell assembly 2 to the circuit management system board. Specifically, one connecting plate 5 corresponds to one group of cell assemblies 2. The connecting plate 5 is provided with tab connection parts 51, and each cell 21 of the cell assembly 2 is connected in series or in parallel through the tab connection parts 51. The connection parts facilitate the electrical connection between each cell 21 and the battery management system board 3. In one embodiment, each cell 21 of the cell assembly 2 is connected in series, that is, each cell 21 is connected in series to the corresponding tab connection part 51 through tabs 22, and the first and last tab connection parts 51 are electrically connected to the battery management system board 3 respectively. For example, the tab connection portion 51 includes a main positive connection portion 511, a main negative connection portion 512, and at least one intermediate connection portion 513. The positive tab of the first cell 21 is connected to the main positive connection portion 511, and the negative tab is connected to the first intermediate connection portion 513. The positive tab of the second cell 21 is connected to the first intermediate connection portion 513, and the negative tab is connected to the second intermediate connection portion 513. This continues until the positive tab of the last cell 21 is connected to the last intermediate connection portion 513, and the negative tab is connected to the main negative connection portion 512. This connects multiple cells 21 in series between the main positive connection portion 511 and the main negative connection portion 512. The main positive connection portion 511 and the main negative connection portion 512 are then electrically connected to the battery management system board 3.

[0078] In another embodiment, the cells 21 of the cell assembly 2 are connected in parallel. For example, the positive electrode tab of each cell 21 is connected to the main positive connection part 511, and the negative electrode tab of each cell 21 is connected to the main negative connection part 512. The main positive connection part 511 and the main negative connection part 512 are then electrically connected to the battery management system board 3.

[0079] During assembly, the tabs 22 of the battery cell 21 are connected to the tab connection part 51, and the assembled whole assembly is placed into the receiving groove 101. Then, the battery management system board 3 is placed into the receiving groove 101 and connected to the connecting plate 5. Alternatively, the tabs 22 and tab connection part 51 of the battery cell 21 can be connected, and the battery management system board 3 can be connected to the connecting plate 5 before being placed into the receiving groove 101. Then, the support part 4 can be formed by injecting glue into the cavity 12 formed in the receiving groove 101.

[0080] For example, the tab connection 51 is made of a metal conductor, commonly nickel, copper or aluminum, and can be mounted on the connection plate 5.

[0081] In some embodiments, the connecting plate 5 is a printed circuit board (PCB). For example, the connecting plate 5 also has the function of acquiring signals such as voltage and temperature of the battery cell 21.

[0082] In some embodiments, a compressible material layer is provided between two adjacent cells 21 in the stacked battery cells 21. This compressible material layer absorbs the thickness expansion generated during the charge-discharge cycle of the cells 21, ensuring that changes in the thickness of the cells 21 during charging, discharging, and cycling do not alter the shape of the battery pack casing. The compressible material layer may employ double-sided adhesive to bond adjacent cells 21. The compressible material includes, but is not limited to, foam, silicone, rubber, and cotton materials.

[0083] In some embodiments, the top ends of the stacked battery cells 21 face the slot 102, and the connecting plate 5 is disposed between the top ends of each battery cell 21 and the battery management system board 3. The battery management system board 3 is disposed at the top ends of the battery cells 21. When the connecting plate 5 is provided to cooperate with the battery cells 21, it is disposed at the end of the connecting plate 5 facing the slot 102. That is, the space occupied by the battery pack is mainly concentrated in the length direction of the battery cells 21, resulting in a compact structure, improved space utilization of the battery, and reduced battery thickness.

[0084] In some embodiments, please refer to Figures 13-16 The connecting plate 5 is provided with a metal sheet 52. One end of the metal sheet 52 is electrically connected to the electrode connecting part 51, and the other end is electrically connected to the battery management system board 3. By providing the metal sheet 52, the connection and current conduction between the connecting plate 5 and the battery management system board 3 do not require wires or other materials; they can be directly connected through the metal sheet 52, reducing material costs and saving the steps of welding or mounting other materials. This simplifies operation and lowers production costs. For example, the metal sheet 52 is L-shaped, and it is laser-spot welded to the connecting plate 5 and soldered to the battery management system board 3. In other embodiments, the metal sheet 52 can also be replaced with a surface-mount stud, wire, etc., to direct the current output of the cell 21 to the battery management system board 3.

[0085] In some embodiments, the battery management system board 3 is provided with a wire harness connector 33, a pin header and socket 34, probes, board-to-board connectors, etc., and is connected to the connection board 5 to transmit the voltage and temperature signals of the battery cell 21 collected by the connection board 5 to the battery management system board 3.

[0086] In some embodiments, the battery management system board 3 is provided with metal guide plate solder holes and multiple solder pads. The solder pads are connected to the connector 35 to transmit current and signals to the output module 8, realizing current transmission and signal exchange between the battery and the terminal host of the power-consuming device, ensuring the current supply from the battery to the terminal host and monitoring the battery status. The connector 35 includes, but is not limited to, multiple long strip-shaped connecting copper plates.

[0087] In some embodiments, please refer to Figures 17-18The battery pack also includes a first housing 6 and a second housing 7, with the first housing 6 connected to the second housing 7. A bracket 1 is disposed within the cavity formed by the first housing 6 and the second housing 7. By setting the first housing 6 and the second housing 7 outside the bracket 1, the mechanical reliability of the battery is further ensured. The connection methods of the first housing 6 and the second housing 7 include, but are not limited to, bolt connection, snap-fit ​​connection, bonding, and pressing.

[0088] In some embodiments, an output module 8, a light guide column assembly 9, a battery indicator light, a battery switch, etc., are provided on the first housing 6 or the second housing 7 to make the battery pack function more complete.

[0089] Based on the battery packs provided in the above embodiments, this application also provides an electrical device that includes any one of the battery packs described in the above embodiments. Since this electrical device uses the battery packs described in the above embodiments, the beneficial effects of this electrical device can be found in the above embodiments.

[0090] It is understood that the design of the electrical device can be for energy storage or power output, or a combination of both, and should fall within the scope of this application. Specifically, it includes, but is not limited to, power tools such as electric drills, electric hammers, sanders, angle grinders, electric wrenches, and electric saws.

[0091] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0092] The above description of the disclosed embodiments enables those skilled in the art to make or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery pack, characterized in that, include: The bracket (1) is provided with a receiving groove (101), and the opening (102) of the receiving groove (101) is located at one end of the bracket (1); The battery cell (21) is disposed in the receiving groove (101); A battery management system board (3) is disposed in the receiving groove (101). The battery management system board (3) is electrically connected to the battery cell (21). A cavity (12) is formed between the inner wall (11) of the bracket (1), the battery cell (21) and the battery management system board (3). The support member (4) is located inside the cavity (12), and the support member (4) is fixedly connected to the inner wall (11) of the bracket (1), the battery cell (21) and the battery management system board (3).

2. The battery pack according to claim 1, characterized in that, The battery management system board (3) is located at one end of the cell (21) facing the slot (102). There is a gap (122) between the edge of the battery management system board (3) and the inner wall (11) of the bracket (1). And / or, the battery management system board (3) is provided with a through hole. The cavity (12) includes the gap (122) and / or the through hole. The cavity (12) also includes an internal cavity (121) located at one end of the battery management system board (3) away from the slot (102). The internal cavity (121) communicates with the slot (102) through the gap (122) and / or the through hole. The support member (4) includes a connecting part (41) and a first main body part (42). The first main body part (42) is disposed in the internal cavity (121). The connecting part (41) is connected to the first main body part (42), and the connecting part (41) is disposed in the gap (122) and / or the through hole.

3. The battery pack according to claim 2, characterized in that, The edge of the battery management system board (3) is provided with at least one notch (31), and the gap (122) is formed between the side wall of the battery management system board (3) surrounding the notch (31) and the inner wall (11) of the bracket (1).

4. The battery pack according to claim 2, characterized in that, The four sides of the first main body (42) are connected to the inner side of the bracket (1). One end of the first main body (42) facing the slot (102) is connected to the battery management system board (3), and the other end is connected to the battery cell (21).

5. The battery pack according to claim 2, characterized in that, The cavity (12) further includes an outer cavity (123) formed by the inner wall (11) of the bracket (1) and the battery management system board (3). The outer cavity (123) is located at the end of the battery management system board (3) facing the slot (102). The support member (4) further includes a second main body (43). The second main body (43) is disposed in the outer cavity (123). The connecting part (41) is connected to the second main body (43). The four side walls of the second main body (43) are connected to the inner wall (11) of the bracket (1). The end of the second main body (43) away from the slot (102) is connected to the battery management system board (3).

6. The battery pack according to claim 1, characterized in that, The support component (4) is a plastic part.

7. The battery pack according to claim 1, characterized in that, The bracket (1) is an integral bracket and is closed around the slot (102). The cavity (12) is connected to the slot (102).

8. The battery pack according to any one of claims 1-7, characterized in that, The inner wall (11) of the bracket (1) is provided with a support (13), and the battery management system board (3) abuts against the end of the support (13) facing the slot (102).

9. The battery pack according to claim 8, characterized in that, The inner wall of the bracket (1) is provided with a groove (103), one end of the groove (103) is open and extends to the slot (102), and the opposite wall of the groove (103) forms the support part (13); the edge of the battery management system board (3) is provided with a protrusion (32), the protrusion (32) is provided in the groove (103) and abuts against the support part (13).

10. The battery pack according to claim 8, characterized in that, The bracket (1) has support parts (13) on its opposite sides, and the battery management system board (3) abuts against the corresponding support parts (13) on its opposite sides.

11. The battery pack according to any one of claims 1-7, characterized in that, The receiving slot (101) is provided with at least one set of battery cell assembly (2), the battery cell assembly (2) includes a plurality of stacked battery cells (21), and each battery cell (21) has a tab (22) at its head end. The battery pack also includes a connecting plate (5) disposed in the receiving groove (101). The connecting plate (5) is provided with a plurality of tab connection parts (51). Each of the battery cells (21) is connected to the corresponding tab connection part (51) through the tab (22). The first and last two tab connection parts (51) are electrically connected to the battery management system board (3) respectively. Alternatively, each of the battery cells (21) is connected to the corresponding two tab connection parts (51) through the tab (22). The two tab connection parts (51) are electrically connected to the battery management system board (3) respectively. The electrode tab (22) and the electrode tab connecting part (51) are located inside the support member (4).

12. The battery pack according to claim 11, characterized in that, The head end of each of the stacked cells (21) faces the slot (102), and the connecting plate (5) is disposed between the head end of each of the cells (21) and the battery management system board (3).

13. The battery pack according to claim 11, characterized in that, The connecting plate (5) is provided with a metal sheet (52), one end of which is electrically connected to the tab connection part (51), and the other end is electrically connected to the battery management system board (3).

14. The battery pack according to claim 1, characterized in that, It also includes a first housing (6) and a second housing (7), the first housing (6) being connected to the second housing (7), and the bracket (1) being disposed in the inner cavity formed by the first housing (6) and the second housing (7).

15. An electrical appliance, characterized in that, Includes the battery pack as described in any one of claims 1-14.

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