A battery and an electrical device

Abstract

This application relates to the field of energy storage device technology, specifically disclosing a battery and an electrical device. The battery includes: at least two cells, each cell comprising a cell body, tabs, and side seals, with the side seals of the at least two cells arranged adjacent to each other; a control circuit board, including a board body, a cell connection portion, and a reinforcing member. A notch is provided on a first side of the board body, and two adjacent extension portions are partially located within the notch in the width direction of the board body. The cell connection portion is located on the board body and electrically connected to the tabs. The reinforcing member is located on the board body, and its projection on the plane of the board body is within the range of the board body, and at least partially located between the notch and a second side of the board body. This battery uses a reinforcing member to strengthen the portion of the control circuit board whose structural strength is weakened due to the notch, thus preventing the control circuit board from breaking in that portion. Simultaneously, the control circuit board does not require a widened design, which is beneficial for increasing battery capacity.

Description

Technical Field

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

[0002] In recent years, with the growth of mobile office and digital needs, the demand for batteries with fast charging and long battery life has also been gradually increasing. To meet the ever-increasing battery life and fast charging requirements of products such as mobile phones and tablets, multiple battery cells need to be connected in series or parallel to increase battery capacity and charging current.

[0003] Furthermore, as the demand for fast charging speed and large capacity of batteries increases, the requirements for battery heat dissipation and safety protection also increase. Especially for situations where multiple battery cells are laid out in a flat manner, it is particularly important to make reasonable use of structural space to increase battery capacity and improve safety. Utility Model Content

[0004] In view of this, the purpose of this application is to provide a battery control circuit board and a battery, the structural design of which can effectively solve the problem of balancing battery capacity and safety.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A battery comprising:

[0007] At least two battery cells, each battery cell including a cell body, a tab, and a side seal. The tab extends from the head end of the cell body and is electrically connected to the cell body. The side seal is located on the side of the cell body, and one end of the side seal extends beyond the head end to form an extension. The side seals of the at least two battery cells are arranged adjacent to each other.

[0008] A control circuit board includes a board body, a cell connection portion, and a reinforcing member. A notch is provided on a first side of the board body. In the width direction of the board body, two adjacent extension portions are partially located within the notch. The cell connection portion is disposed on the board body and electrically connected to the electrode tab. The reinforcing member is disposed on the board body and is at least partially located between the notch and a second side of the board body.

[0009] The first side faces the head end, and the second side is opposite to the first side.

[0010] Optionally, in the above-described battery, the projection of the reinforcing member onto the plane of the plate is located within the range of the plate;

[0011] Optionally, in the above-described battery, the reinforcement member is fixedly connected to the plate body at least in the portion located between the notch and the second side of the plate body;

[0012] Optionally, in the above-described battery, the reinforcing member is welded or riveted to the plate body;

[0013] Optionally, in the battery described above, the reinforcing member includes a first reinforcing portion located between the notch and the second side and a second reinforcing portion respectively connected to both ends of the first reinforcing portion, with the two second reinforcing portions extending along the notch to the first side.

[0014] Optionally, in the battery described above, two adjacent extensions are interference-fitted or transition-fitted with the notch.

[0015] Optionally, in the above-mentioned battery, the plate body is provided with a first pad, the reinforcement is welded to the first pad, the first pad has a pad protrusion formed by the edge protruding outward, the reinforcement has a reinforcement protrusion formed by the edge protruding outward, and the reinforcement protrusion is welded to the pad protrusion;

[0016] Optionally, in the above-described battery, the edge of the reinforcing member has an inwardly recessed reinforcing recess;

[0017] Optionally, in the battery described above, the plate body is provided with a second solder pad, the cell connection part is soldered to the second solder pad, and the edge of the cell connection part has an inwardly recessed connection recess.

[0018] Optionally, in the above-mentioned battery, the reinforcing member is made of a conductive material, and the reinforcing member is electrically connected to the conductive layer of the plate.

[0019] Optionally, in the above-mentioned battery, the reinforcing member is made of a thermally conductive material and conducts heat in contact with the plate.

[0020] Optionally, in the above-mentioned battery, the first surface of the plate is provided with the reinforcing member;

[0021] Optionally, in the above-described battery, the reinforcing member is provided on the second surface of the plate.

[0022] The first and second sides of the plate are opposite to each other, and the battery cell connection part is located on the first side of the plate.

[0023] Optionally, in the battery described above, a groove is provided on the second side of the plate body, and the reinforcing member includes a first reinforcing member, a second reinforcing member, and an intermediate portion connected between the first reinforcing member and the second reinforcing member. The first reinforcing member is disposed on the first surface of the plate body, the second reinforcing member is disposed on the second surface of the plate body, the intermediate portion is disposed on the second side, and the projection of the intermediate portion on the second side is at least partially located in the groove.

[0024] Optionally, in the above-described battery, the middle portion is located within the groove, and the surface of the middle portion is flush with or within the groove opening;

[0025] Optionally, in the battery described above, the middle portion is located in the middle of the first reinforcing portion and the middle of the second reinforcing portion in a first direction, wherein the first direction is the length direction of the plate.

[0026] Optionally, the battery described above also includes a top sealing edge that extends beyond the head end and forms a top sealing groove, and the tab includes a root portion connected to the cell body and a bent portion opposite to the root portion;

[0027] The cell connection portion includes a first connection portion, a second connection portion, and a transition portion connecting the first connection portion and the second connection portion. The first connection portion and the second connection portion are opposite to each other. The side of the first connection portion away from the second connection portion is electrically connected to the plate body, and the side of the second connection portion facing the first connection portion is electrically connected to the tab.

[0028] The first side of the plate is located in the top sealing groove, and the end face of the plate that is electrically connected to the first connecting part faces the top sealing edge.

[0029] The battery provided in this application features a notch in the circuit board, into which the extension of the side seal extends, allowing the notch to align with the extension of the side seal to facilitate the mounting of the control circuit board. Simultaneously, a reinforcing member, at least partially located between the notch and the second side of the circuit board, reinforces the portion of the control circuit board whose structural strength is weakened by the notch. This portion benefits from the increased structural strength due to the material hardness of the reinforcing member, preventing the control circuit board from breaking in that area. Furthermore, since the control circuit board does not require a widened design, it avoids additional space occupation for the battery cells, thus maximizing usable space and increasing battery capacity.

[0030] To achieve the above objectives, this application also provides an electrical device comprising any of the aforementioned batteries. Since the batteries described above possess the aforementioned technical effects, the electrical device incorporating such batteries 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 1This is a schematic diagram of the structure of a battery cell according to a specific embodiment of this application;

[0033] Figure 2 for Figure 1 Side view;

[0034] Figure 3 This is a schematic diagram of the structure of a battery according to a specific embodiment of this application;

[0035] Figure 4 This is a schematic diagram of the structure of a control circuit board according to a specific embodiment of this application;

[0036] Figure 5 for Figure 4 Front view of the central control circuit board;

[0037] Figure 6 for Figure 5 Rear view;

[0038] Figure 7 for Figure 5 Schematic diagram of AA section;

[0039] Figure 8 This is a schematic diagram of the structure of a plate body according to a specific embodiment of this application;

[0040] Figure 9 for Figure 8 Rear view;

[0041] Figure 10 This is a schematic diagram of the axial structure of a reinforcement according to a specific embodiment of this application;

[0042] Figure 11 This is a front view of an enhancement according to a specific embodiment of this application;

[0043] Figure 12 This is a schematic diagram of the axial structure of the battery cell connector before assembly according to a specific embodiment of this application;

[0044] Figure 13 This is a top view of the cell connector before assembly according to a specific embodiment of this application;

[0045] Figure 14 This is a front view of the cell connector before assembly according to a specific embodiment of this application;

[0046] Figure 15 This is a schematic diagram of the connector structure according to a specific embodiment of this application;

[0047] Figure 16 This is a schematic diagram of the assembly of a battery cell and a control circuit board according to a specific embodiment of this application;

[0048] Figure 17 for Figure 16A schematic diagram of the structure of the control circuit board after its first flip.

[0049] Figure 18 for Figure 3 Front view of the battery;

[0050] Figure 19 for Figure 18 Schematic diagram of AA section;

[0051] Figure 20 for Figure 19 Enlarged schematic diagram of part A in the middle;

[0052] Figure 21 for Figure 18 Schematic diagram of the BB cross section;

[0053] Figure 22 for Figure 21 Enlarged schematic diagram of part A in the middle;

[0054] Figure 23 This is a schematic diagram of the battery structure according to another specific embodiment of this application;

[0055] Figure 24 This is a schematic diagram of the control circuit board according to another specific embodiment of this application;

[0056] Figure 25 for Figure 24 Front view of the central control circuit board;

[0057] Figure 26 for Figure 25 Rear view;

[0058] Figure 27 for Figure 25 Schematic diagram of AA section;

[0059] Figure 28 This is a schematic diagram of the plate structure according to another specific embodiment of this application;

[0060] Figure 29 for Figure 28 Rear view;

[0061] Figure 30 This is a schematic diagram of the axial structure of the reinforcement according to another specific embodiment of this application;

[0062] Figure 31 This is a front view of an enhancement according to another specific embodiment of this application;

[0063] Figure 32 This is a top view of the reinforcement according to another specific embodiment of this application;

[0064] Figure 33This is a schematic diagram of the battery cell and control circuit board assembly according to another specific embodiment of this application;

[0065] Figure 34 for Figure 33 A schematic diagram of the structure of the control circuit board after its first flip.

[0066] Figure 35 for Figure 23 Front view of the battery;

[0067] Figure 36 for Figure 35 Schematic diagram of AA section;

[0068] Figure 37 for Figure 36 Enlarged diagram of part A in the middle.

[0069] Figure label:

[0070] 1-Battery cell; 2-Control circuit board;

[0071] 11-Cell body; 12-Taper; 13-Side sealing edge; 14-Top sealing edge; 15-Top sealing groove; 111-Head end; 121-Root; 122-Bending part; 131-Extension part;

[0072] 21-Board body; 22-Cell connection part; 23-Reinforcement component; 24-Connector; 241-Soldering pin;

[0073] 211-First side; 212-Notch; 213-Second side; 214-First pad; 2141-Pad protrusion; 215-Second pad; 216-Third pad; 217-First surface; 218-Second surface; 219-Groove;

[0074] 221 - Connecting recess; 222 - First connecting portion; 223 - Second connecting portion; 224 - Transition portion;

[0075] 231-First reinforcing part; 232-Second reinforcing part; 233-Reinforcing protrusion; 234-Reinforcing recess; 235-First reinforcing member; 236-Second reinforcing member; 237-Intermediate part. Detailed Implementation

[0076] This application discloses a battery and an electrical device to reinforce the weak points of the battery control circuit board and optimize the usable space of the battery to increase battery capacity.

[0077] 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.

[0078] The battery cell is the part of a battery primarily responsible for storing electrical energy. Please refer to [link / reference]. Figure 1 and Figure 2 The battery cell 1 provided in this application includes a battery cell body 11 and a tab 12 extending from one end of the battery cell body 11. For ease of explanation, the end of the battery cell 1 extending from the tab 12 is referred to as the head end 111. The tab 12 is electrically connected to the battery cell body 11. The battery cell body 11 is responsible for storing electrical energy, and the tab 12 is used for electrical connection with the battery control circuit board 2. Specifically, the tab 12 can be configured as a positive tab and a negative tab electrically connected to the battery cell body 11. For example, there can be two tabs 12, one of which is a positive tab and the other is a negative tab. Alternatively, there can be more than two tabs 12. For example, the head end 111 of the battery cell body 11 is connected to three tabs 12, one of which is a positive tab and the other two are negative tabs connected in parallel. For example, the width of the tab 12 is in the range of 6~8mm. It should be noted that the numerical range mentioned in this application includes the values ​​of both ends unless otherwise stated. The surface of the battery cell 1 can be printed with QR code silkscreen information and other content.

[0079] For a pouch battery, the cell 1 also includes a protective structure disposed outside the cell body 11. The protective structure forms a top sealing edge 14 at the top of the cell body 11. The top sealing edge 14 is not bent and extends beyond the head end 111 of the cell body 11 to form a top sealing groove 15. For example, the width of the top sealing groove 15 is in the range of 2.5~3.5mm. The protective structure forms a side sealing edge 13 at the side end of the cell body 11. The side sealing edge 13 is bent to face the side end face of the cell body 11. For example, the protective structure can be made of a polymer film, such as aluminum-plastic film material. After the aluminum-plastic film is sealed and pressed, the top sealing edge 14 is not bent to form the top sealing groove 15, and the side aluminum-plastic film sealing edge is bent to form the aforementioned side sealing edge 13. The top end of the side sealing edge 13 extends beyond the cell body 11 to form an extension 131.

[0080] The battery control circuit board is used to connect the battery cell 1 to external electronic devices and can control functions such as charging and discharging the battery cell 1. It can also protect the battery cell 1 as needed. Depending on the required functions, the battery control circuit board is equipped with corresponding components. The control circuit board can be located at the head end 111 of the battery cell body 11.

[0081] To improve battery energy density, the battery can have two or more cells 1, and the control circuit board can be connected to at least two cells 1. For ease of explanation, the following embodiment uses two cells 1 and the control circuit board as an example. The two cells 1 are laid flat, and their side seals 13 are adjacent. To avoid obstruction from the extensions 131 of the side seals 13 of the two cells 1, a notch needs to be provided on the control circuit board. However, after the notch is created on the control circuit board, the width of the control circuit board at the notch is reduced, resulting in weaker structural strength and even a risk of breakage. To ensure the structural strength of the control circuit board, the control circuit board can be widened as a whole. However, widening the control circuit board occupies additional space, reducing the usable space for the cells and thus affecting the battery energy density.

[0082] Therefore, in order to balance the structural strength of the battery control circuit board and the battery energy density, this application adds reinforcing components to strengthen weak points. It abandons the design structure that uses the control circuit board itself as a carrier, and while strengthening the control circuit board, it makes great use of the battery compartment space, which is beneficial to increasing battery capacity. The following embodiments mainly describe the above structure; other battery structures can refer to conventional battery designs.

[0083] In some embodiments, please refer to Figures 1-7 In some embodiments, the battery provided in this application includes a battery cell 1 and a control circuit board 2. At least two battery cells 1 are provided. Each battery cell 1 includes a cell body 11, a tab 12, and a side seal 13. The tab 12 extends from the head end 111 of the cell body 11 and is electrically connected to the cell body 11. The side seal 13 is located on the side of the cell body 11, with one end extending beyond the head end 111 to form an extension 131. The side seals 13 of at least two battery cells 1 are arranged adjacent to each other. The control circuit board 2 includes a board body 21, a cell connection portion 22, and a reinforcing member 23. A notch 212 is provided on a first side 211 of the board body 21, with the first side 211 facing the head end 111, i.e., the notch 212 faces the head end 111. In the width direction of the plate 21, two adjacent extensions 131 are located within the notch 212. By providing the notch 212 on the plate 21, and having the extensions 131 of the side sealing edge 13 extend into and accommodate the notch 212 in the width direction of the plate 21, the gap between the cell 1 and the control circuit board 2 caused by the extensions 131 can be reduced, thereby solving the problem that the extensions 131 cause the battery length to be too large, affecting the energy density of the battery.

[0084] In some embodiments, since the thickness of the board 21 is typically less than the height of the extension 131, the extension 131 is not entirely located within the notch 212 in the thickness direction of the cell 1. Instead, it is partially located within the notch 212 and partially extends beyond the notch 212 and lies above the upper surface of the board 21. The depth of the notch 212 is set according to the length of the extension 131. The length of the extension 131 is generally the same as the width of the top sealing groove 15. The depth direction of the notch 212 is the distance direction between the first side 211 and the second side 213, which is also the width direction of the control circuit board 2. For example, the depth of the notch 212 is greater than the length of the extension 131, such as greater than 3.5 mm. The cell connection portion 22 is provided on the board 21 and electrically connected to the electrode tab 12.

[0085] The reinforcing member 23 is disposed on the plate 21, and is at least partially located between the notch 212 and the second side 213 of the plate 21, the second side 213 being opposite to the first side 211. Since the structural strength is relatively weak at the location between the notch 212 and the second side 213 of the plate 21, the reinforcing member 23 is at least partially located between the notch 212 and the second side 213 of the plate 21 to effectively reinforce this part.

[0086] Using the battery provided in this application, a notch 212 is provided on the plate 21, and the extension 131 of the side sealing edge 13 extends into the notch 212, meaning the notch 212 can be offset from the extension 131 of the side sealing edge 13 to accommodate the installation of the control circuit board 2. Simultaneously, a reinforcing member 23 is provided, at least partially located between the notch 212 and the second side 213 of the plate 21, to reinforce the portion of the control circuit board 2 whose structural strength is weakened due to the notch 212. This portion benefits from the material hardness of the reinforcing member 23, increasing its structural strength and preventing the control circuit board 2 from breaking in this area. Furthermore, since the control circuit board 2 does not require a widened design, it avoids additional space occupation for the battery cell 1, thus maximizing the usable space for the battery cell 1 and increasing battery capacity.

[0087] In some embodiments, the projection of the reinforcement 23 onto the plane of the plate 21 is located within the area of ​​the plate 21. It is understood that the plane of the plate 21 can be the plane containing the surface of the plate 21. The projection of the reinforcement 23 onto the aforementioned plane does not exceed the area of ​​the plate 21, where the area of ​​the plate 21 refers to the range corresponding to the width and length of the plate 21. When the second side 213 of the plate 21 is flat, the projection of the reinforcement 23 onto the aforementioned plane does not exceed the second side 213 of the plate 21. When the second side 213 of the plate 21 is not flat, the projection of the reinforcement 23 onto the aforementioned plane does not exceed the range covered by the width of the plate 21. As configured above, the reinforcement 23 does not occupy additional width space in the width direction of the control circuit board 2.

[0088] In some embodiments, please refer to Figures 4-7 The portion of the reinforcing member 23 located at least between the notch 212 and the second side 213 of the plate 21 is fixedly connected to the plate 21. Since the structural strength is relatively weak at the location between the notch 212 and the second side 213 of the plate 21, fixing the portion of the reinforcing member 23 located at the aforementioned location to the plate 21 enhances the overall structural strength of this portion, making it less prone to breakage.

[0089] In some embodiments, the reinforcement 23 is welded or riveted to the plate 21. Welding or riveting the reinforcement 23 to the plate 21 provides a reliable connection and facilitates operation. In other embodiments, the reinforcement 23 and the plate 21 may also be connected by bonding or other fixing methods.

[0090] In some embodiments, please refer to Figures 4-7 The reinforcing member 23 includes a first reinforcing portion 231 located between the notch 212 and the second side 213, and second reinforcing portions 232 respectively connected to both ends of the first reinforcing portion 231. The two second reinforcing portions 232 extend along the notch 212 to the first side 211. In this embodiment, the reinforcing member 23 includes a portion located between the notch 212 and the second side 213, and also includes a portion extending along the edge of the notch 212 to the notch 212, thereby forming an integral reinforcing member 23 surrounding the edge of the notch 212. The notch 212 is reinforced by the reinforcing member 23, thus the structural strength of the control circuit board 2 is higher. The width b of the second reinforcing portion 232 can be adjusted as needed, and its range can be 1.5~2.5mm, such as 2.0mm. For example, the notch 212 is U-shaped, the reinforcing member 23 is U-shaped, and is disposed around the edge of the U-shaped notch 212.

[0091] In some embodiments, the two adjacent extensions 131 are interference-fitted or transition-fitted with the notch 212. Along the length of the plate 21, the total thickness of the two adjacent extensions 131 is the same as the length of the notch 212, or the total thickness of the two adjacent extensions 131 is slightly greater than the length of the notch 212, or the total thickness of the two adjacent extensions 131 is slightly less than the length of the notch 212, so that the plate 21 can clamp the two extensions 131, thereby fixing the two battery cells 1. For example, the length of the notch 212 ranges from 2.5 to 3 mm, such as 2.7 mm.

[0092] In some embodiments, please refer to Figures 8-9 The board body 21 is a multilayer board, that is, a printed circuit board with three or more conductive pattern layers, which are laminated with insulating materials in between, and the conductive patterns are interconnected as required. Multilayer circuit boards are a product of the development of electronic information technology towards high speed, multifunctionality, large capacity, small size, thinness and lightweight.

[0093] In some embodiments, please refer to Figure 4 , Figures 8-9 The board body 21 is provided with a first pad 214, and the reinforcement 23 is soldered to the first pad 214. In this embodiment, by providing the first pad 214 on the board body 21 for soldering to the reinforcement 23, the reinforcement 23 can be easily fixed to the board body 21. The shape of the reinforcement 23 is approximately the same as that of the first pad 214, and the length and width dimensions of the reinforcement 23 need to be smaller than the corresponding length and width dimensions of the first pad 214, generally less than 0.1mm. For example, the first pad 214 is a copper exposure pad, that is, the solder resist ink on the surface of the board body 21 does not seal a specific shaped area, thus exposing the internal conductive layer copper foil. The thickness of the solder resist ink on the surface of the board body 21 ranges from 0.025-0.04mm. The surface of the copper exposure pad is coated with metallic tin.

[0094] In some embodiments, please refer to Figure 4 , Figures 8-11 The first pad 214 has at least one pad protrusion 2141 formed by outward protrusion of its edge, and the reinforcement 23 has a reinforcement protrusion 233 formed by outward protrusion of its edge. The reinforcement protrusion 233 corresponds to and is welded to the pad protrusion 2141. The first pad 214 has an outward protrusion 2141 at its edge, and the reinforcement 23 has a corresponding outward protrusion 233. The pad protrusion 2141 and the reinforcement protrusion 233 cooperate to achieve alignment of the plate 21 and the reinforcement 23 during welding. During welding, the fluidity and molecular attraction of the liquid metal can align the two. For example, the reinforcement protrusion 233 has the same shape as the pad protrusion 2141, and the reinforcement protrusion 233 is directly opposite the pad protrusion 2141. For example, the first pad 214 has pad protrusions 2141 on both sides along the width and length direction of the board 21, and the reinforcement 23 has reinforcement protrusions 233 at opposite ends. The projection of the pad protrusions 2141 on the board 21 can be semi-circular, and the projection of the corresponding reinforcement protrusions 233 on the board 21 is also semi-circular.

[0095] In some embodiments, please refer to Figure 4 , Figures 10-11The reinforcing member 23 has at least one inwardly recessed portion 234 on its edge. By providing the reinforcing recess 234, during welding, the liquid metal can be attracted and gathered molecularly within the reinforcing recess 234, and then climb onto the reinforcing member 23. Furthermore, the amount of side metal within the reinforcing recess 234 can be increased, thus allowing for a more secure connection between the reinforcing member 23 and the plate 21 after the liquid metal has solidified. For example, the reinforcing recess 234 is located on the side of the reinforcing member 23 facing the notch 212. The number of reinforcing recesses 234 can be set as needed, such as two or more. The projection of the reinforcing recess 234 onto the plate 21 can be semi-circular, meaning the reinforcing recess 234 forms a semi-circular hole on the edge of the reinforcing member 23, with a diameter ranging from 0.5 to 1.5 mm, such as 1.0 mm.

[0096] In some embodiments, please refer to Figure 4 , Figures 8-9 and Figures 12-14 The board body 21 is provided with a second solder pad 215, and the cell connection portion 22 is soldered to the second solder pad 215. In this embodiment, by providing a second solder pad 215 on the board body 21 for soldering to the cell connection portion 22, the cell connection portion 22 can be easily fixed to the board body 21, and electrically connected to the electrode tab 12 through the cell connection portion 22. In other embodiments, the electrode tab 12 can also be connected to the solder pad on the board body 21 as needed. The edge of the cell connection portion 22 has at least one inwardly recessed connection recess 221. By providing the connection recess 221, during soldering, the liquid metal can be attracted and gathered in the connection recess 221 and climb up the cell connection portion 22, and the amount of side metal in the connection recess 221 can be increased. Therefore, after the liquid metal solidifies, the connection between the cell connection portion 22 and the board body 21 can be made more secure. In addition, burrs generated by die stamping of the cell connection portion 22 can be avoided, thereby avoiding burrs affecting the soldering of the cell connection portion 22. For example, the connecting recess 221 is provided on the side of the cell connecting portion 22 facing the second side 213 of the plate body 21. The number of connecting recesses 221 can be set as needed. The projection of the connecting recess 221 on the plate body 21 can be semi-circular, that is, the connecting recess 221 is a semi-circular hole on the edge of the cell connecting portion 22, and the diameter of the semi-circular hole is in the range of 0.5~1.5mm, such as 1.0mm.

[0097] In some embodiments, please refer to Figure 4 , Figures 8-9 and Figure 15The board body 21 has a third pad 216, on which a connector 24 is soldered. The connector 24 is used to connect to an external electronic device, thereby connecting the battery cell 1 to the external electronic device. For example, the connector 24 is a flexible circuit board, which is a highly reliable and flexible printed circuit made of polyester film or polyimide as a substrate. A soldering pin 241 is provided at the tail of the flexible circuit board for soldering to the third pad 216. For example, both the second pad 215 and the third pad 216 are exposed copper pads.

[0098] In some embodiments, the first pad 214 and the second pad 215 have different shapes for easy differentiation. For example, the first pad 214 has the same shape as the reinforcement 23, such as a U-shape. The distance between the first pad 214 and the edge of the board 21 is greater than 0.2 mm to prevent copper leakage from the sides of the control circuit board 2 when the reinforcement 23 is made of a metal sheet such as copper. This is because, to reduce the manufacturing cost of the reinforcement 23, it can be formed by first plating with nickel to prevent copper oxidation from increasing internal resistance, and then stamping, which would result in copper leakage from its sides. Therefore, by making the distance between the first pad 214 and the edge of the board 21 greater than 0.2 mm, copper leakage from the sides of the control circuit board 2 can be prevented. For example, the second pad 215 is rectangular, and the third pad 216 is rectangular.

[0099] In one example, the board 21 has the aforementioned first pad 214, second pad 215, and third pad 216. During soldering, the reinforcement 23 is placed on the first pad 214. The side of the cell connector 22 with the connecting recess 221 is placed on the second pad 215. The soldering pins 241 of the connector 24 are placed on the third pad 216. The molten tin on the surface of each pad is melted into a liquid state by high temperature. Under the effect of fluid attraction, the molten tin covers the side of the connecting recess 221, making the molecules in close contact. After cooling and solidification, the cell connector 22 can be more firmly connected to the second pad 215. Similarly, the reinforcing recess 234 of the reinforcement 23 can also be more firmly connected to the first pad 214. Under the fluidity and molecular attraction of the liquid molten tin, the reinforcing protrusion 233 of the reinforcing member 23 and the pad protrusion 2141 of the first pad 214 attract and position each other, which can better position the reinforcing member 23 and the board 21 and prevent displacement. In addition, during the above welding process, other functional components, such as ICs (integrated circuits), MOS (metal-oxide-semiconductor field-effect transistors), ROS, resistors, transistors, etc., can be simultaneously welded to the surface of the board 21 to form a functional control circuit board 2.

[0100] In some embodiments, the reinforcement 23 is made of a conductive material and is electrically connected to the conductive layer of the board 21. When a large current is required at the notch 212 of the control circuit board 2, if the narrow width of the board cannot meet the overcurrent requirements of its internal conductive layer (such as copper foil), by electrically connecting the reinforcement 23 to the conductive layer of the board 21, the current is carried by the conductivity of the reinforcement 23 itself, thereby improving the current carrying capacity of the internal conductive layer of the board 21. This eliminates the need to increase the width of the control circuit board 2 due to overcurrent in the internal conductive layer, further improving the battery capacity.

[0101] In some embodiments, the reinforcement 23 is a metal sheet. The metal material has good electrical conductivity, and the metal sheet can be made of copper plated with nickel, pure nickel, aluminum, etc. The thickness of the metal sheet ranges from 0.1 to 0.3 mm. For example, if the first pad 214 is connected to the internal copper foil of the board 21, then the reinforcement 23 can be connected via the internal copper foil.

[0102] In some embodiments, the reinforcement 23 is made of a thermally conductive material and contacts the plate 21 for heat conduction. The reinforcement 23 is made of a thermally conductive material and contacts the plate 21. By utilizing its excellent thermal conductivity, it conducts and dissipates the heat energy inside the control circuit board 2. This improves the heat dissipation capacity of the control circuit board 2 while controlling its width and size, meeting the requirements of electrical devices for fast charging heat dissipation of the battery control circuit board 2, thereby improving the safety performance of the battery.

[0103] In some embodiments, the first surface 217 of the plate 21 is provided with a reinforcement 23. See also... Figures 4-6 The first surface 217 of the plate 21 is provided with a reinforcing member 23, while the second surface 218 is not provided with a reinforcing member 23; that is, the reinforcing member 23 is only provided on the first surface 217 of the plate 21. The first surface 217 and the second surface 218 of the plate 21 are opposite to each other. The cell connection portion 22 is provided on the first surface 217 of the plate 21. Exemplarily, the first surface 217 of the plate 21 faces the top sealing edge 14. In other embodiments, the reinforcing member 23 may also be provided on the second surface 218 of the plate 21, while the first surface 217 is not provided with a reinforcing member 23. Providing a reinforcing member 23 on only one side of the plate 21 facilitates connection and reduces the space occupied in the thickness direction of the plate 21.

[0104] In some embodiments, a reinforcement member 23 is provided on the first surface 217 of the plate 21, and a reinforcement member 23 is also provided on the second surface 218 of the plate 21. By providing reinforcement members 23 on both surfaces of the plate 21, the reinforcement effect of the plate 21 is better. Specifically, the reinforcement member 23 can be provided on one or both surfaces of the plate 21 according to the structural strength requirements of the plate 21. For example, when the plate width between the notch 212 and the second side 213 is greater than a certain value, the reinforcement member 23 is provided only on one surface of the plate 21; when the plate width between the notch 212 and the second side 213 is less than a certain value, the reinforcement member 23 is provided on both surfaces of the plate 21.

[0105] In some embodiments, please refer to Figures 23-37 The second side 213 of the plate 21 is provided with a groove 219. By providing the groove 219, the risk of the second side 213 of the plate 21 breaking when subjected to impact can be reduced.

[0106] In some embodiments, the reinforcement 23 includes a first reinforcement 235, a second reinforcement 236, and an intermediate portion 237 connecting the first reinforcement 235 and the second reinforcement 236. The first reinforcement 235 is disposed on the first surface 217 of the plate 21, the second reinforcement 236 is disposed on the second surface 218 of the plate 21, and the intermediate portion 237 is disposed on the second side 213. The projection of the intermediate portion 237 on the second side 213 is at least partially located in the groove 219, that is, the reinforcement 23 bypasses at least part of the groove 219. To reduce the risk of breakage of the second side 213 of the plate 21 under impact, a groove 219 is formed on the second side 213. However, the addition of the groove 219 weakens the torsional resistance of the plate 21 at this location. Therefore, a U-shaped reinforcement 23 is provided at the groove 219 for reinforcement. In this embodiment, reinforcement members 23 are provided on both sides of the plate 21, and the portions of the reinforcement members 23 located on both sides of the plate 21 (i.e., the first reinforcement member 235 and the second reinforcement member 236) are connected by the middle portion 237. Specifically, the reinforcement member 23 can be an integral structure, thereby achieving a better reinforcement effect.

[0107] In some embodiments, the middle portion 237 is located within the groove 219, and the surface of the middle portion 237 is flush with or within the opening of the groove 219. In this embodiment, when the projection of the reinforcement 23 onto the plane of the plate 21 does not exceed the range of the plate 21, it means that the projection of the reinforcement 23 onto the plane of the plate 21 does not extend beyond the second side 213 where the groove 219 is not provided in the width direction of the plate 21. By providing the groove 219 on the second side 213 of the plate 21, a receiving space is provided for the middle portion 237, so that it does not extend beyond the second side 213 where the groove 219 is not provided, that is, the width of the plate 21 is not increased. When the plate 21 has first pads 214 respectively soldered to the first reinforcement 235 and the second reinforcement 236, the distance 'a' between the upper edge of the first pad 214 and the second side 213 is in the range of 0.3~0.5mm, such as 0.4mm, so that the reinforcement 23 does not extend beyond the edge of the plate 21. Both the first reinforcing member 235 and the second reinforcing member 236 may specifically include the first reinforcing portion 231 and the second reinforcing portion 232 described above. When the reinforcing member 23 is fixed, it is inserted into the plate body 21 along the groove formed by the first reinforcing member 235 and the second reinforcing member 236.

[0108] In some embodiments, the intermediate portion 237 is located at the middle of the first reinforcement 235 and the middle of the second reinforcement 236 in a first direction, wherein the first direction is the length direction of the plate 21. The first direction is parallel to the first surface 217 of the plate 21 and perpendicular to the distance direction between the first side 211 and the second side 213. In the first direction, the length of the intermediate portion 237 is less than the length of the first reinforcement 231 and the length of the second reinforcement 232. As described above, slots are formed at both ends of the reinforcement 23 to reduce stress, thereby facilitating the bending of the U-shaped reinforcement 23.

[0109] For example, the reinforcing member 23 is a sheet-like structure with a thickness less than a value, which is formed by symmetrical bending, and the bending point is the middle part 237. For example, the bending height f is equal to the thickness of the plate 21.

[0110] In some embodiments, please refer to Figures 16-22 The battery cell 1 includes a top sealing edge 14 extending beyond the head end 111 and forming a top sealing groove 15. The electrode tab 12 includes a root portion 121 connected to the battery cell body 11 and a bent portion 122 opposite to the root portion 121. The battery cell connecting portion 22 includes a first connecting portion 222, a second connecting portion 223, and a transition portion 224 connecting the first connecting portion 222 and the second connecting portion 223. The first connecting portion 222 and the second connecting portion 223 are opposite to each other. The first connecting portion 222 is electrically connected to the plate body 21, and the end of the second connecting portion 223 facing the first connecting portion 222 is electrically connected to the electrode tab 12. The first side 211 of the plate body 21 is located in the top sealing groove 15, and the end face of the plate body 21 that is electrically connected to the first connecting portion 222 faces the top sealing edge 14. As set up above, by flipping the control circuit board 2, the notch 212 avoids the extension 131 of the side sealing edge 13. The control circuit board 2 can maintain a reliable electrical connection with the cell body 11, and the two are in a compact position with little space occupation, which is conducive to improving battery capacity.

[0111] In some embodiments, before the control circuit board 2 and the battery cell 1 are assembled, the battery cell connection portion 22 is an L-shaped metal sheet with good conductivity and flexibility. For example, the material of the battery cell connection portion 22 is copper-plated nickel, pure nickel, aluminum, etc. The thickness of the battery cell connection portion 22 ranges from 0.1 to 0.3 mm. The battery cell connection portion 22 is bent at 90°, with the horizontal L-shaped section electrically connected to the board body 21, forming a first connection portion 222 after the control circuit board 2 and the battery cell 1 are assembled. The vertical L-shaped section is used for electrical connection to the electrode tab 12, forming a second connection portion 223 after the control circuit board 2 and the battery cell 1 are assembled. The length d of the battery cell connection portion 22 needs to be greater than the width of the electrode tab 12. The width e of the battery cell connection portion 22 can be set in the range of 2.5 to 4 mm as required. A groove is made at the bend to reduce subsequent bending stress. The groove height c is approximately 0.2 mm.

[0112] For example, during fabrication, the battery cell 1 and the control circuit board 2 are first placed horizontally. The positive and negative electrode tabs 12 of the battery cell 1 are then stacked with the L-shaped vertical section, as shown below. Figure 16 Then, circuit connections and fastening can be achieved through laser welding, resistance welding, soldering, etc. Next, the welded control circuit board 2 is bent and pressed together at a 90° angle between the vertical and horizontal sections of the L-shape. After pressing, it resembles... Figure 17 Then, flip and press the control circuit board 2 180° along the tab 12. After pressing, it should look like... Figure 3 The first side 211 of the plate 21 extends into the top sealing groove 15, and the extension 131 of the side sealing edge 13 is inserted into the notch 212, thus obtaining the battery core unit, which can realize the energy storage of the battery pack.

[0113] It is understood that when a battery includes two or more cells 1, if two cells 1 and the control circuit board 2 satisfy the cooperation relationship described in this application, or if three or more cells 1 or each cell 1 and the control circuit board 2 satisfy the cooperation relationship described in this application, all of these are within the protection scope of this application.

[0114] Based on the batteries provided in the above embodiments, this application also provides an electrical device, which includes any of the batteries described in the above embodiments. Since this electrical device uses the batteries described in the above embodiments, the beneficial effects of this electrical device can be found in the above embodiments.

[0115] 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, mobile phones, tablets, and laptops.

[0116] 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.

[0117] 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, characterized by, include: At least two battery cells (1), each battery cell (1) includes a battery cell body (11), a tab (12) and a side seal (13). The tab (12) extends from the head end (111) of the battery cell body (11) and is electrically connected to the battery cell body (11). The side seal (13) is located on the side of the battery cell body (11) and one end of the side seal (13) extends beyond the head end (111) to form an extension (131). The side seals (13) of the at least two battery cells (1) are arranged adjacent to each other. The control circuit board (2) includes a board body (21), a cell connection part (22), and a reinforcing member (23). A notch (212) is provided on the first side (211) of the board body (21). In the width direction of the board body (21), two adjacent extensions (131) are partially located in the notch (212). The cell connection part (22) is provided on the board body (21) and electrically connected to the electrode (12). The reinforcing member (23) is provided on the board body (21) and is at least partially located between the notch (212) and the second side (213) of the board body (21). The first side (211) faces the head end (111), and the second side (213) is opposite to the first side (211).

2. The battery of claim 1, wherein, The projection of the reinforcing member (23) onto the plane of the plate (21) is within the range of the plate (21); And / or, the reinforcement (23) is fixedly connected to the plate (21) at least at the portion between the notch (212) and the second side (213) of the plate (21); And / or, the reinforcement (23) is welded or riveted to the plate (21); And / or, the reinforcement (23) includes a first reinforcement (231) located between the notch (212) and the second side (213) and a second reinforcement (232) respectively connected to both ends of the first reinforcement (231), the two second reinforcements (232) extending along the notch (212) to the first side (211).

3. The battery of claim 1, wherein, The two adjacent extensions (131) are either interference-fitted or transition-fitted with the notch (212).

4. The battery of claim 1, wherein, The plate (21) is provided with a first pad (214), and the reinforcement (23) is welded to the first pad (214). The first pad (214) has a pad protrusion (2141) formed by the edge protruding outward. The reinforcement (23) has a reinforcement protrusion (233) formed by the edge protruding outward. The reinforcement protrusion (233) is welded to the pad protrusion (2141). And / or, the edge of the reinforcement (23) has an inwardly recessed reinforcement recess (234). And / or, the plate (21) is provided with a second pad (215), the cell connection part (22) is soldered to the second pad (215), and the edge of the cell connection part (22) has an inwardly recessed connection recess (221).

5. The battery of claim 1, wherein, The reinforcing member (23) is made of conductive material, and the reinforcing member (23) is electrically connected to the conductive layer of the plate (21); And / or, the reinforcement (23) is made of a thermally conductive material and is in contact with the plate (21) for thermal conduction.

6. The battery according to any one of claims 1-5, characterized in that, The first surface (217) of the plate (21) is provided with the reinforcing member (23); And / or, the second side (218) of the plate (21) is provided with the reinforcement (23); The first surface (217) and the second surface (218) of the plate (21) are opposite to each other, and the cell connection part (22) is provided on the first surface (217) of the plate (21).

7. The battery of claim 6, wherein, The plate (21) has a groove (219) on its second side (213). The reinforcement (23) includes a first reinforcement (235), a second reinforcement (236), and an intermediate portion (237) connecting the first reinforcement (235) and the second reinforcement (236). The first reinforcement (235) is located on the first surface (217) of the plate (21), the second reinforcement (236) is located on the second surface (218) of the plate (21), and the intermediate portion (237) is located on the second side (213). The projection of the intermediate portion (237) on the second side is at least partially located in the groove (219).

8. The battery of claim 7, wherein, The middle part (237) is located inside the groove (219), and the surface of the middle part (237) is flush with or inside the groove (219). And / or, the middle portion (237) is located in the middle of the first reinforcement (235) and the middle of the second reinforcement (236) in a first direction, wherein the first direction is the length direction of the plate (21).

9. The battery according to any one of claims 1 to 5, wherein The battery cell (1) also includes a top sealing edge (14) that extends beyond the head end (111) and forms a top sealing groove (15). The electrode tab (12) includes a root (121) connected to the battery cell body (11) and a bent portion (122) opposite to the root (121). The cell connection part (22) includes a first connection part (222), a second connection part (223), and a transition part (224) connecting the first connection part (222) and the second connection part (223). The first connection part (222) and the second connection part (223) are opposite to each other. The side of the first connection part (222) facing away from the second connection part (223) is electrically connected to the plate body (21), and the side of the second connection part (223) facing the first connection part (222) is electrically connected to the tab (12). The first side (211) of the plate (21) is located in the top sealing groove (15), and the end face of the plate (21) that is electrically connected to the first connecting part (222) faces the top sealing edge (14).

10. An electrical device, characterized by Includes the battery as described in any one of claims 1-9.

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