Battery protection board, battery, battery pack, battery assembly and electrical device

Abstract

The present application relates to the technical field of batteries. Disclosed are a battery protection board, a battery, a battery pack, a battery assembly and an electrical device. The battery has a first direction and a second direction intersecting each other. The battery comprises: a cell group, which includes at least two cells arranged side by side in the first direction, each cell having a tab side and a non-tab side; and a protection circuit module, which is arranged on the tab side and comprises a first circuit board and at least two second circuit boards, wherein the direction of thickness of the second circuit boards and the first circuit board is parallel to the second direction; the at least two second circuit boards are arranged corresponding to the tab sides of the at least two cells, and the first circuit board spans across the tab sides of at least two adjacent cells and is connected to at least two adjacent second circuit boards; a clearance space is formed between two second circuit boards corresponding to side encapsulation components at the middle part of any two adjacent cells, the clearance space being used for providing clearance for the side encapsulation components at the middle part of said two adjacent cells.

Description

Battery protection board, battery, battery pack, battery assembly and electrical equipment

[0001] This application claims priority to Chinese Patent Application No. 202422716289.9, filed on November 7, 2024, entitled “Battery Protection Board and Battery”, the entire contents of which are incorporated herein by reference.

[0002] This application claims priority to Chinese Patent Application No. 202520172775.0, filed on January 24, 2025, entitled "Battery and Battery Pack", the entire contents of which are incorporated herein by reference.

[0003] This application claims priority to Chinese Patent Application No. 202520310394.4, filed on February 25, 2025, entitled “Battery Components and Electronic Devices”, the entire contents of which are incorporated herein by reference.

[0004] This application claims priority to Chinese Patent Application No. 202521827781.1, filed on August 25, 2025, entitled “Battery Protection Board, Battery Pack and Electrical Equipment”, the entire contents of which are incorporated herein by reference. Technical Field

[0005] This application relates to the field of battery technology, specifically to battery protection boards, batteries, battery packs, battery components, and electrical equipment. Background Technology

[0006] With the increasing demand for battery capacity, batteries require significant stacking space along their length. To reduce the length of the battery, dual-cell batteries utilize two cells connected in series or parallel. Connecting two cells in series results in a higher voltage than a single cell, making it easier to achieve high-current super-fast charging. Connecting two cells in parallel maintains the same voltage while increasing battery capacity and extending battery life.

[0007] Circuit boards are usually placed at the ends of dual-cell batteries. The circuit boards take up a certain amount of space, which affects the length of the cell body and thus the overall capacity of the battery. Summary of the Invention

[0008] In view of this, this application provides a battery protection board, a battery, a battery pack, a battery assembly, and an electrical device to solve, to some extent, the problem of circuit boards occupying space and thus affecting the overall battery capacity.

[0009] In a first aspect, this application provides a battery having intersecting first and second directions. The battery includes: a cell pack including at least two cells arranged side-by-side along the first direction, each cell having a tab side and a non-tab side disposed along the second direction; and a protection circuit module disposed on the tab side, the protection circuit module including a first circuit board and at least two second circuit boards, the thickness directions of the second circuit boards and the first circuit board being parallel to the second direction, the at least two second circuit boards being disposed corresponding to the tab sides of the at least two cells, the first circuit board spanning across the tab sides of at least two adjacent cells and connected to at least two adjacent second circuit boards, and a clearance space being formed between two second circuit boards corresponding to the side encapsulation of the middle portion of any two adjacent cells, the clearance space being used to avoid the side encapsulation of the middle portion of the two adjacent cells.

[0010] Beneficial effects: A second circuit board is provided on the tab side of each cell, and two adjacent second circuit boards are flexibly connected through a first circuit board. The thickness direction of the second circuit board and the first circuit board is parallel to the second direction Y. In the cell assembly, a clearance space is formed between two second circuit boards corresponding to the side package of the middle part of any two adjacent cells. The clearance space can avoid the package structure of the middle part of the two adjacent cells, so that the second circuit board can avoid the edge part of the top package and the top of the middle package of the cell assembly. This can reduce the length of the cell in the second direction, leave design space for cell capacity increase, and improve the energy density of the battery.

[0011] Secondly, this application also provides a battery assembly, including:

[0012] First battery cell;

[0013] The second battery cell is arranged side by side with the first battery cell and there is an installation gap between the first battery cell and the second battery cell;

[0014] A battery protection board includes a functional part and a connecting part. At least a portion of the functional part is disposed in the mounting gap, and the connecting part is disposed outside the mounting gap. The functional part is connected to the connecting part, and the connecting part is electrically connected to the first tab of the first battery cell and the second tab of the second battery cell, respectively.

[0015] Thirdly, this application also provides an electrical device, including a device housing, a motherboard and the aforementioned battery assembly, wherein the motherboard and the battery assembly are both installed in the device housing, and the battery assembly is connected to the motherboard.

[0016] Beneficial Effects: The battery assembly disclosed in this application improves upon related technologies. The battery assembly includes a first cell, a second cell, and a battery protection board. The first and second cells are arranged side-by-side, with an installation gap between them. The battery protection board includes a functional section and a connecting section. The functional section performs the protection function of the battery protection board and is connected to the connecting section. The connecting section is electrically connected to the first tab of the first cell and the second tab of the second cell, respectively, thereby connecting the functional section to the first and second cells. When installing the battery protection board, at least a portion of the functional section can be placed within the installation gap, while the connecting section is placed outside the installation gap. This disperses the functional section and the connecting section, preventing the battery assembly from becoming excessively large in some areas due to component stacking, thus reducing the probability of the battery protection board being squeezed, impacted, or scratched. Simultaneously, the first and second cells also shield and protect the functional section, further reducing the probability of damage to the battery protection board and improving the lifespan of the battery assembly.

[0017] Fourthly, this application also provides a battery protection board, comprising:

[0018] A PCB board includes at least two main bodies and at least one clearance portion, the clearance portion being located between any two adjacent main bodies, the main bodies having pads for connecting battery cells, and the clearance portion having clearance notches for clearance of the sealing edge structure for clearance of the battery cells;

[0019] A reinforcing member is connected to the clearance portion and has a shape similar to that of the clearance notch.

[0020] Fifthly, this application also provides a battery pack, including a battery cell and the aforementioned battery protection board, wherein the battery protection board is soldered to the tabs of the battery cell via solder pads; or, the battery pack includes a battery as described above.

[0021] Sixthly, this application also provides an electrical device including the aforementioned battery pack.

[0022] Beneficial effects: When the battery protection board provided in this application is connected to a battery cell, it can be connected to the clearance part by a reinforcing member with a shape similar to the clearance notch to reinforce the area where the width and thickness of the clearance part are small. When the battery protection board is connected to multiple battery cells, it can be connected to the battery cell's tab by a solder pad on the main body, and the clearance notch can be used to avoid the side sealing edge between two adjacent battery cells. In this connection method, the capacity of the battery cell can be increased without increasing the battery's packaging space. Furthermore, by reinforcing the clearance part with a reinforcing member, the occurrence of bending or breakage of the battery protection board when connected to the battery cell can be reduced.

[0023] Seventhly, this application also provides a battery protection board, comprising:

[0024] First printed circuit board;

[0025] Second printed circuit board;

[0026] A connection component, comprising a positive electrode connector and a negative electrode connector, wherein the first printed circuit board and the second printed circuit board are spaced apart along a first direction;

[0027] A flexible circuit board, the flexible circuit board including a bonding portion and an extension portion connected to each other, the bonding portion being bonded to a first printed circuit board and a second printed circuit board respectively on opposite sides in a first direction;

[0028] The extension protrudes relative to the first printed circuit board and the second printed circuit board, and the extension includes two mounting surfaces that are opposite to each other in the first direction. The positive electrode connector and the negative electrode connector are both disposed on the same mounting surface.

[0029] Eighthly, this application also provides a battery, the battery including the battery protection board described above.

[0030] Beneficial Effects: The battery protection board of this application includes a first printed circuit board, a second printed circuit board, a flexible circuit board, and a connecting assembly. The connecting assembly includes a positive electrode connector and a negative electrode connector. The first and second printed circuit boards are spaced apart along a first direction. The flexible circuit board includes a bonding portion and an extension portion connected to each other. The bonding portion is bonded to the first and second printed circuit boards on opposite sides in the first direction, respectively. The extension portion protrudes relative to the first and second printed circuit boards and includes two mounting surfaces opposite to each other in the first direction. The positive electrode connector and the negative electrode connector are both disposed on the same mounting surface and are used to connect to the positive and negative electrodes of the battery cell, respectively. Thus, the surfaces of the first and second printed circuit boards facing away from the bonding portion can both be used to mount electronic components, increasing the mounting space, improving the overcurrent effect of the battery protection board, thereby improving the heat dissipation effect of the battery and reducing the battery temperature rise. Attached Figure Description

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

[0032] Figure 1 is a perspective view of a battery according to an embodiment of this application;

[0033] Figure 2 is an exploded view of the battery shown in Figure 1;

[0034] Figure 3 is a perspective view of the protection circuit module shown in Figure 2;

[0035] Figure 4 is an exploded view of the battery shown in Figure 2 from another angle;

[0036] Figure 5 is a top view of the battery shown in Figure 1;

[0037] Figure 6 is a top cross-sectional view of the battery shown in Figure 5 along the CC direction;

[0038] Figure 7 is a front view of the battery pack and protection circuit module shown in Figure 1;

[0039] Figure 8 is a schematic diagram of the upper part of the battery cell assembly and protection circuit module shown in Figure 7;

[0040] Figure 9 is a three-dimensional view of the battery cell shown in Figure 1;

[0041] Figure 10 is a three-dimensional view of the battery cell shown in Figure 9 from another angle;

[0042] Figure 11 is a front view of another battery protection circuit module according to an embodiment of this application;

[0043] Figure 12 is a front view of the protection circuit module and encapsulant shown in Figure 11;

[0044] Figure 13 is a schematic diagram of the structure of the battery assembly disclosed in an embodiment of this application;

[0045] Figure 14 is a schematic diagram of the positional relationship between the battery protection board and the battery cell provided in an exemplary embodiment of this application;

[0046] Figure 15 is a magnified view of a portion of position A in Figure 1;

[0047] Figure 16 is a front structural diagram of the battery protection board provided in an exemplary embodiment of this application;

[0048] Figure 17 is a schematic diagram of the back structure of the battery protection board provided in an exemplary embodiment of this application;

[0049] Figure 18 is a front view of various structural types of the reinforcing member provided in the exemplary embodiments of this application;

[0050] Figure 19 shows a schematic diagram of the structure of the battery protection board according to an embodiment of this application;

[0051] Figure 20 shows a schematic diagram of the flexible circuit board structure;

[0052] Figure 21 shows a schematic diagram of the structure of the first printed circuit board;

[0053] Figure 22 shows a schematic diagram of the structure of the second printed circuit board;

[0054] Figure 23 shows a schematic diagram of the battery structure.

[0055] Explanation of reference numerals in the attached drawings: 1. Battery cell assembly; 101. Battery cell; 1011. Battery cell body; 10111. Electrode; 1012. Packaging structure; 10121. Top seal; 10122. First side seal; 10123. Second side seal; 2. Protection circuit module; 201. Second circuit board; 202. First circuit board; 2021. Horizontal plate; 2022. Output board; 20221. First vertical section; 20222. Horizontal section; 20223. Second vertical section; 203. First type of component; 204. Second type of component; 205. Welding piece; 206. Reinforcing piece; 3. Injection molded part; 401. Side insulating tape; 402. Bottom insulating tape; 403. Top insulating tape; 404. Fixing tape; 5. Easy-pull sticker; 6. Handle; 7. Sealing adhesive; 110-First battery cell, 111-First tab, 1111-First positive tab, 1112-First negative tab, 112-First side, 120-Second battery cell, 121-Second tab, 1211-Second positive tab, 1212-Second negative tab, 122-Second side, 130-Battery protection board, 131-Functional part, 1311-Rigid board, 1312-Battery protection device, 132-Connecting part, 1321-First flexible board, 1322-Second flexible board, 1323-First bending section, 1324-Second bending section, 140-Mounting gap, 150-Connector; 8-PCB board; 810-Main body; 811-Pad; 820-Alignment part; 821-Alignment notch; 822-First side; 823-Second side; 9-Reinforcing member; 10-Battery cell; 1010-Electrode tab; 16-First printed circuit board; 161-First notch; 162-Pad; 17-Second printed circuit board; 171-Second notch; 18-Flexible circuit board; 181-Adhesive part; 182-Extension part; 183-Bending part; 184-First notch; 185-Second notch; 19-Connecting plate; 20-Connecting assembly; 2001-Positive electrode connector; 2002-Negative electrode connector; 21-Battery cell; 211-Positive electrode tab; 212-Negative electrode tab; N-Second direction; W-Third direction. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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, 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.

[0057] With the increasing demand for battery capacity, batteries require significant stacking space along their length. To reduce this length, dual-cell designs utilize two cells connected in series or parallel. Series connection results in a higher voltage than a single-cell design, facilitating high-current super-fast charging. Parallel connection maintains the same voltage while increasing battery capacity and extending range. However, the dual-cell design increases PCB width to accommodate more electronic components. Since the side seals of the cells cannot be bent, a protrusion exists between the two cells. When the PCB is placed perpendicular to the top surface of the cells, this interference affects the overall battery length.

[0058] To address this issue, this application discloses a battery and a battery pack to solve the problem that placing the top surface of the vertically aligned battery cell on the PCB board affects the overall length of the battery.

[0059] The technical solutions disclosed in the various embodiments of this application will be described in detail below with reference to Figures 1 to 12.

[0060] According to an embodiment of this application, in one aspect, a battery is provided having intersecting first direction X and second direction Y, the battery including: a cell pack 1 and a protection circuit module 2.

[0061] Specifically, the battery cell assembly 1 includes at least two battery cells 101, which are arranged side by side along a first direction X, and each battery cell 101 has a tab side and a non-tab side arranged along a second direction Y.

[0062] The protection circuit module 2 is disposed on the tab side. The protection circuit module 2 includes a first circuit board 202 and at least two second circuit boards 201. The thickness directions of the second circuit boards 201 and the first circuit board 202 are parallel to the second direction Y. The at least two second circuit boards 201 are disposed one-to-one with the tab side of at least two battery cells 101. The first circuit board 202 spans across the tab side of at least two adjacent battery cells 101 and is connected to at least two adjacent second circuit boards 201. A clearance space is formed between the two second circuit boards 201 corresponding to the side package of the middle part of any two adjacent battery cells 101. The clearance space is used to avoid the side package of the middle part of the two adjacent battery cells 101.

[0063] In the battery of this embodiment, a second circuit board 201 is provided on the tab side of each cell 101. Two adjacent second circuit boards 201 are flexibly connected through a first circuit board 202. The thickness direction of the second circuit board 201 and the first circuit board 202 is parallel to the second direction Y. In the cell group 1, a clearance space is formed between two second circuit boards 201 corresponding to the side package of the middle part of any two adjacent cells 101. The clearance space can avoid the side package of the middle part of two adjacent cells 101, so that the second circuit board 201 can avoid the edge part of the top seal 10121 and the top of the middle seal of the cell group 1. This can reduce the length of the cell 101 in the second direction, leave design space for increasing the capacity of the cell 101, and improve the energy density of the battery.

[0064] Specifically, the first circuit board 202 is provided at least corresponding to the edge portion of the top seal 10121 and the top of the middle side seal. The battery cell 101 has a top surface and a bottom surface arranged along the second direction. The thickness direction of the second circuit board 201 and the first circuit board 202 is perpendicular to the top surface, which can shorten the length of the battery, save the length space of the battery, and thus improve the energy density of the battery.

[0065] In some embodiments, the thickness of the first circuit board 202 is less than the thickness of the second circuit board 201.

[0066] It should be noted that the side where the tab 10111 of the battery cell 101 is located is the top side, and the other side of the battery cell 101 opposite to the tab 10111 is the bottom side.

[0067] In some embodiments, the battery also has a third direction Z that intersects the first direction X and the second direction Y in pairs. The first direction is the width direction of the cell 101, the second direction is the length direction of the cell 101, and the third direction is the thickness direction of the cell 101.

[0068] Specifically, there are two cells 101, and the battery adopts a dual-cell design.

[0069] It is understood that, in another embodiment, the number of battery cells 101 in battery cell group 1 may also be three, four, etc., and the number of battery cells 101 may be selected according to specific needs.

[0070] In one embodiment, a second circuit board 201 is disposed on the tab side of a battery cell 101.

[0071] It is understood that in another embodiment, two or more second circuit boards 201 are provided on the tab side of a battery cell 101. In this case, only the two second circuit boards corresponding to the side package of the middle part of the two battery cells 101 form a clearance space, and no clearance space is formed between the two or more second circuit boards corresponding to a battery cell.

[0072] In one embodiment, as shown in Figures 3 and 8, a first circuit board 202 is disposed on the side of the second circuit board 201 facing away from the battery cell 101, and a first type of component 203 is disposed on the side of the second circuit board 201 facing the battery cell 101. The first type of component 203 is disposed on the side of the second circuit board 201 facing the battery cell 101, making full use of the space between the top surface of the second circuit board 201 and the battery cell 101, thereby improving the space utilization rate of the battery.

[0073] In one embodiment, as shown in Figures 9 to 11, the first circuit board 202 has a first surface facing the battery cell 101. The battery cell 101 includes a battery cell body 1011 and a packaging structure 1012 encapsulating the battery cell body 1011. The first surface, the second circuit board 201, and the packaging structure 1012 enclose a mounting space. A second type of component 204 located in the mounting space is fixed on the first surface. The height of the second type of component 204 along the second direction Y is higher than the height of the first type of component 203. Since the thickness of the second circuit board 201 is greater than the thickness of the first circuit board 202, the higher-height second type of component 204 is placed on the first circuit board 202, and the lower-height first type of component 203 is placed on the second circuit board 201. In the second direction, the space utilization of the battery in the length direction is optimized, thereby making more efficient use of the limited space.

[0074] In some embodiments, the packaging structure 1012 has a top seal 10121, two first side seals 10122 and a second side seal 10123. The two first side seals 10122 are disposed on both sides of the cell body 1011 along a first direction. The top seal 10121 is disposed on the tab side of the cell body 1011. The second side seal 10123 is connected to the top seal 10121 and the two first side seals 10122. The second side seal 10123 is perpendicular to the first side seals 10122. When two cells 101 are arranged side by side, two first side seals 10122 are disposed between two adjacent cell bodies 1011. At this time, the two first side seals 10122 between the two cell bodies 1011 can also be referred to as intermediate seals.

[0075] Specifically, the top seal 10121 has a straight section extending along a first direction and arc-shaped sections disposed on both sides of the straight section along the first direction. The second circuit board 201 is disposed above the straight section. The second circuit board 201 can avoid the arc-shaped sections and the protrusion of the intermediate seal protruding from the top surface of the cell body 1011.

[0076] It is understood that, in another embodiment, the first circuit board 202 is disposed on the side of the second circuit board 201 facing the battery cell 101, and components are disposed on the side of the second circuit board 201 facing away from the battery cell 101. Along the second direction Y, the side of the first circuit board 202 facing away from the battery cell 101 is not higher than the side of the components facing away from the battery cell 101, that is, the height of the first circuit board 202 does not exceed the height of the components, and does not affect the length of the battery. The first circuit board 202 has an arched portion that arches towards the direction facing away from the battery cell 101, and the arched portion forms a clearance space on the side facing the battery cell, which is used to avoid the encapsulation structure in the middle part of the two battery cells.

[0077] In one embodiment, as shown in Figures 3 and 7, the first circuit board 202 has a second surface facing away from the second circuit board 201. The second surface is provided with a solder pad 205, which is used for soldering the tabs 10111 of the battery cell 101. By soldering the solder pad 205 to the tabs 10111 of the battery cell 101, the soldering reliability between the first circuit board 202 and the tabs 10111 is improved.

[0078] In some embodiments, the welding piece 205 is made of nickel or the like. Nickel can provide a stable substrate, prevent copper oxidation, and prevent copper from diffusing into the gold layer, thereby ensuring the long-term stability and reliability of the welding area.

[0079] Specifically, the thickness of the welding piece 205 is 0.1mm-0.5mm. The 0.1mm welding piece 205 has advantages such as lightweight, flexibility, and space saving. The 0.2mm to 0.3mm welding piece 205 has advantages such as good conductivity, enhanced mechanical strength, and ease of welding. The 0.4mm to 0.5mm welding piece 205 has advantages such as high mechanical strength, high current carrying capacity, stable electrical performance, vibration and shock resistance, and durability.

[0080] It should be noted that the choice of welding sheet 205 of different thicknesses should be determined based on the specific application requirements.

[0081] In one embodiment, the first circuit board 202 has a second surface facing away from the second circuit board 201, and a reinforcing piece 206 is provided on the portion of the second surface corresponding to the space between two adjacent second circuit boards 201. The reinforcing piece 206 is provided in the middle portion of the first circuit board 202 to improve the flatness and strength of the protection circuit module 2.

[0082] In one embodiment, the thickness of the first circuit board 202 is 0.2mm-0.4mm. The thickness of the first circuit board 202 can meet the requirements of high current products. The first circuit board 202 provides a good balance between lightweight, mechanical strength, flexibility and electrical performance, and is suitable for a variety of electronic devices and complex environments.

[0083] In some embodiments, as shown in Figures 3, 7, and 11, the first circuit board 202 includes a horizontal plate 2021 and an output plate 2022. The horizontal plate 2021 is located above the two battery cells 101 and is soldered to the two second circuit boards 201. The output plate 2022 includes a first vertical section 20221, a horizontal section 20222, and a second vertical section 20223. The horizontal section 20222 is arranged parallel to the horizontal plate 2021. The first vertical section 20221 connects the horizontal plate 2021 and the horizontal section 20222. The second vertical section 20223 is used to connect to external circuits or devices and is perpendicular to the first vertical section 20221.

[0084] In one embodiment, as shown in Figures 1 to 3, an injection molded part 3 is injection molded on the tab side. The injection molded part 3 encapsulates the protection circuit module 2 and the tab 10111 of the battery cell 101. After the protection circuit module 2 is soldered to the tab 10111 of the battery cell 101, the head of the battery is injection molded to prevent the first circuit board 202 from rebounding and deforming, thereby increasing the strength of the battery head and effectively preventing battery failure due to drops. After the battery head is injection molded, compared with the conventional battery cell 101 packaging method where the PCB board is perpendicular to the top surface of the battery cell 101, the battery in this embodiment can be shortened by 1.0 mm in length, leaving design space for increasing the capacity of the battery cell 101, saving battery length space, and thus improving battery energy density.

[0085] Understandably, in another embodiment, the second circuit board 201 and the components disposed on the second circuit board 201 are encapsulated using a plastic encapsulation process. The two second circuit boards 201 and components are first encapsulated using a plastic encapsulation process and then welded to the first circuit board 202. This can also effectively avoid the arc-shaped part raised in the middle of the top seal 10121 of the battery and the protruding part of the middle seal. After the protection circuit module 2 is welded and shaped with the cell 101, the battery can be shortened by 1.5mm in length compared to the conventional dual-cell 101 encapsulation method, while improving the strength of the battery head and effectively preventing the battery and PCB from falling and failing.

[0086] In some embodiments, as shown in FIG12, the second circuit board 201 and the components are encapsulated using SIP technology, and the components on the second circuit board 201 are wrapped with encapsulating adhesive 7.

[0087] It should be noted that the second circuit board 201 is a rigid printed circuit board (PCB), the first circuit board 202 is a flexible printed circuit board (FPC), the protection circuit module 2 is PCM, and the up and down direction refers to the second direction.

[0088] Understandably, in another embodiment, the second circuit board 201 and components are first encapsulated using the SIP process, with the components on the second circuit board 201 wrapped in encapsulating adhesive 7, and then the head of the battery is injection molded to form the injection molded part 3.

[0089] In one embodiment, as shown in Figures 2 and 4, the battery further includes side insulating tape 401, bottom insulating tape 402, top insulating tape 403, fixing tape 404, easy-pull sticker 5, and a handle 6. The bottom of the battery cell 101 is wrapped with bottom insulating tape 402, the sides of the two battery cells 101 that are far apart are wrapped with side insulating tape 401, the surfaces of the two battery cells 101 that are close to each other are provided with fixing tape 404, and the top surface of the battery cell 101 and the PCM are provided with top insulating tape 403. The stability of the structure is achieved by the side insulating tape 401, bottom insulating tape 402, top insulating tape 403, and fixing tape 404, resulting in a battery cell semi-finished product. The battery semi-finished product is wrapped with the handle 6 and the easy-pull sticker 5 to form a finished battery product.

[0090] According to an embodiment of this application, another aspect provides a battery pack, including the battery described above.

[0091] In one embodiment, the battery pack further includes a housing, a cover, etc., the housing having a receiving cavity, the cover sealing the receiving cavity and being connected to the housing, and the battery being disposed in the receiving cavity.

[0092] In related technologies, in dual-cell batteries, since the side seals of the cells cannot be bent, there is a protrusion in the middle of the battery. When the PCB board is placed perpendicular to the top surface of the cells, it interferes with the protrusion. As a result, the battery is longer in the length direction after encapsulation, which affects the overall length of the battery.

[0093] In this embodiment, the battery's PCM uses two PCBs connected by an FPC in the middle. By shaping the FPC, the arc-shaped portion of the top seal 10121 and the protruding portion of the middle seal can be effectively avoided. The battery is then fixed by injection molding at the head. Alternatively, the components and PCB can be encapsulated in SIP first, followed by insulation wrapping. Compared to conventional dual-cell packaging, the battery in this embodiment can be shortened by 0.6mm to 1.5mm in length, leaving design space for increasing the capacity of cell 101. This saves product length space, increases battery energy density, and improves the strength of the battery head, effectively preventing battery drop failure. The product has good strength, robustness, and high flatness, meeting the requirements of fast charging technology.

[0094] Currently, most electronic devices such as mobile phones and tablets are powered by batteries. Batteries typically integrate a battery protection board, which protects the battery during charging and discharging, preventing overcharging, over-discharging, and short circuits. In related technologies, a dual-cell structure is often used to increase battery capacity. The battery protection board is usually encapsulated at the head of the dual-cell structure. This often results in a large head size for the dual-cell structure, and during battery installation, the large head size can easily lead to problems such as compression, impact, and scratches on the battery protection board.

[0095] In addition, the battery protection board protects the battery cell during charging and discharging to prevent it from being overcharged, over-discharged, overcurrented, short-circuited, or subjected to excessively high temperatures. In related technologies, the battery protection board includes a PCB (Printed Circuit Board) and an FPC (Flexible Printed Circuit). The PCB and FPC are stacked and soldered together, then mounted together at a predetermined end of the battery cell. Because the stacked volume of the PCB and FPC is relatively large, it can result in an excessively thick predetermined end of the battery cell.

[0096] To address this issue, this application also discloses a battery module and electrical device to solve the problem of large head volume in the dual-cell structure of related technologies.

[0097] The technical solutions disclosed in the various embodiments of this application are described in detail below with reference to the accompanying drawings.

[0098] Based on the above issues, please refer to Figure 13. This application discloses a battery assembly, which may include a first battery cell 110, a second battery cell 120, and a battery protection board 130. The first battery cell 110 and the second battery cell 120 are arranged side-by-side. The first battery cell 110 has a first tab 111, and the second battery cell 120 has a second tab 121. The tab is a metal conductor that leads the positive and negative electrodes out of the battery cell. The end of the first battery cell 110 with the first tab 111 can be defined as the head of the first battery cell 110, and the end of the second battery cell 120 with the second tab 121 can be defined as the head of the second battery cell 120. When the first battery cell 110 and the second battery cell 120 are arranged side-by-side, the heads of the first battery cell 110 and the heads of the second battery cell 120 face the same direction.

[0099] The battery protection board 130 includes a functional part 131 and a connecting part 132. The functional part 131 is equipped with devices such as a control IC and a MOS switch to realize the protection function of the battery protection board 130. The connecting part 132 is mainly used to realize the electrical connection between the functional part 131 and components such as the first battery cell 110 and the second battery cell 120. The first battery cell 110 and the second battery cell 120 are arranged side by side and have a mounting gap 140 between them. At least a part of the functional part 131 can be placed in the mounting gap 140 and the connecting part 132 can be placed outside the mounting gap 140. This allows the functional part 131 and the connecting part 132 to be distributed and installed in different positions of the battery assembly, avoiding a concentrated stacking situation.

[0100] In actual connection, the functional part 131 is connected to the connecting part 132. The connecting part 132 is electrically connected to the first tab 111 of the first battery cell 110 and the second tab 121 of the second battery cell 120. The specific connection method may include welding, conductive bonding, etc.

[0101] As described above, the battery assembly disclosed in this application improves upon related technologies. The battery assembly includes a first cell 110, a second cell 120, and a battery protection board 130. The first cell 110 and the second cell 120 are arranged side-by-side, with an installation gap 140 between them. The battery protection board 130 includes a functional part 131 and a connecting part 132. The functional part 131 implements the protection function of the battery protection board 130. The functional part 131 is connected to the connecting part 132, which is electrically connected to the first tab 111 of the first cell 110 and the second tab 121 of the second cell 120, thereby connecting the functional part 131 to the first cell 110 and the second cell 120. When installing the battery protection board 130, at least a portion of the functional part 131 can be placed in the installation gap 140, and the connecting part 132 can be placed outside the installation gap 140, so as to realize the distributed installation of the functional part 131 and the connecting part 132. This can avoid the situation where the battery assembly has an excessively large local volume due to the stacking of components, thereby reducing the probability of the battery protection board 130 being squeezed, collided, or scratched. At the same time, the first cell 110 and the second cell 120 can also shield and protect the functional part 131, further reducing the probability of damage to the battery protection board 130 and improving the service life of the battery assembly.

[0102] As shown in Figure 13, in order to facilitate the connection between the functional part 131 and the connecting part 132, the functional part 131 has a connecting end that extends out of the mounting gap 140. The functional part 131 can be connected to the connecting part 132 through the connecting end. The specific connection method can be welding, conductive bonding, etc.

[0103] Since various components need to be installed on the functional unit 131, to improve the stability of the installation, as shown in Figure 13, the functional unit 131 may include a rigid board 1311 and a battery protection device 1312. The rigid board 1311 can be a PCB board. The battery protection device 1312 can be electrically connected to the surface of the rigid board 1311 by means of soldering, conductive bonding, etc. Furthermore, the battery protection device 1312 is located in the installation gap 140. Under the protection of the first battery cell 110 and the second battery cell 120, the probability of the battery protection device 1312 being bumped or damaged can be reduced. The battery protection device 1312 may include components such as a control IC, MOS switch, resistor, capacitor, fuse, PTC (positive temperature coefficient thermistor), NTC (negative temperature coefficient thermistor), and memory.

[0104] The control IC is the core of the protection board, responsible for monitoring battery voltage and current. When the voltage or current exceeds the set value, the control IC controls the opening and closing of the MOS switch to protect the battery. Resistors are used to limit current or divide voltage to ensure stable circuit operation. Capacitors are used to stabilize voltage, filter, or store energy to ensure stable circuit operation. When the current abnormally rises to a certain level, the fuse will blow, cutting off the circuit and preventing the battery from overheating or being damaged. In high-temperature environments, the resistance of the PTC will increase sharply, limiting the current and preventing the battery from overheating. When the ambient temperature rises, the resistance of the NTC will decrease, used to monitor the battery temperature to control the charging and discharging process. The memory is used to store the setting parameters of the battery protection board 130, such as overcharge, over-discharge, and overcurrent protection thresholds. These components work together to ensure the safety of the battery during charging and discharging, preventing problems such as overcharging, over-discharging, overcurrent, short circuits, and overheating, thereby extending the battery's lifespan.

[0105] As shown in Figure 13, the aforementioned connecting part 132 may include a first flexible circuit board 1321 and a second flexible circuit board 1322. The first and second flexible circuit boards 1321 and 1322 can be flexible printed circuit boards (FPCs). FPCs are bend-resistant circuit boards made with polyimide or polyester film as the substrate, featuring high wiring density, light weight, and thinness. A first tab 111 is disposed at the mounting end of the first battery cell 110, and a second tab 121 is disposed at the mounting end of the second battery cell 120. The first flexible circuit board 1321 can be disposed opposite to the mounting ends of the first battery cell 110 and the second battery cell 120, respectively, so that the first flexible circuit board 1321 can be electrically connected to the first tab 111 and the second tab 121, respectively. One end of the second flexible circuit board 1322 is connected to the first flexible circuit board 1321, and the other end of the second flexible circuit board 1322 is connected to the connecting end, thereby realizing the conduction of the circuit between the functional part 131 and the first battery cell 110 and the second battery cell 120. The connection method between the second flexible board 1322, the first flexible board 1321, and the functional part 131 can be welding, conductive bonding, etc.

[0106] As shown in Figure 13, the first flexible circuit board 1321 may include a first end and a second end facing away from each other. The first end is close to the first battery cell 110, and the second end is close to the second battery cell 120. At least one of the first end and the second end is provided with a connector 150. The battery protection board 130 can be connected to an external circuit through the connector 150. For example, when the battery assembly is installed in an electrical device, the battery protection board 130 can be connected to the mainboard of the electrical device through the connector 150, and the mainboard of the electrical device can uniformly control the battery assembly. The type of connector 150 may include a plug connector, a snap-fit ​​connector, a threaded connector, etc.

[0107] To facilitate connection of connector 150 to external circuits, as shown in Figure 13, the first end of the first flexible board 1321 is provided with a first bending section 1323, which bends away from the first battery cell 110. The second end of the first flexible board 1321 is provided with a second bending section 1324, which bends away from the second battery cell 120. Connectors 150 are provided at the ends of the first bending section 1323 and the second bending section 1324, which is beneficial for the mainboard of the electrical equipment to control the first battery cell 110 and the second battery cell 120 separately.

[0108] The first flexible circuit board 1321 is used to connect with the first battery cell 110 and the second battery cell 120. Specifically, a first tab pad and a second tab pad can be respectively provided on the surface of the first flexible circuit board 1321 near the first battery cell 110 and the second battery cell 120. The first tab pad is electrically connected to the first tab 111, and the second tab pad is electrically connected to the second tab 121. The tab pad and the tab of the battery cell can be assembled by welding, conductive bonding or other methods.

[0109] The aforementioned first tab 111 may include a first positive tab 1111 and a first negative tab 1112, and the second tab 121 may include a second positive tab 1211 and a second negative tab 1212. The first tab pad may include a first positive tab pad and a first negative tab pad, and the second tab pad may include a second positive tab pad and a second negative tab pad. The first positive tab pad is electrically connected to the first positive tab 1111, the first negative tab pad is electrically connected to the first negative tab 1112, the second positive tab pad is electrically connected to the second positive tab 1211, and the second negative tab pad is electrically connected to the second negative tab 1212, thereby enabling the circuit to be connected between the first battery cell 110, the second battery cell 120, and the battery protection board 130. The aforementioned electrical connection methods may include welding, conductive bonding, etc.

[0110] As shown in Figure 13, the first cell 110 has a first side 112 near the second cell 120, and the second cell 120 has a second side 122 near the first cell 110. The first side 112 and the second side 122 are spaced apart to form a mounting gap 140. Along the perpendicular line connecting the first side 112 and the second side 122, the size of the mounting gap 140 can be larger than the size of the functional part 131, thereby preventing interference between the components on the functional part 131 and the first cell 110 or the second cell 120. Furthermore, after the first cell 110, the second cell 120, and the battery protection board 130 are assembled, they can be encapsulated as a whole to improve the dustproof and waterproof performance of the battery assembly. The encapsulation material can be polyethylene, polypropylene, polystyrene, etc.

[0111] This application also discloses an electrical device, which may include battery-powered electronic products such as mobile phones, tablets, televisions, smart wearable products (e.g., smartwatches, smart bracelets), virtual reality terminal devices, and augmented reality terminal devices. The aforementioned electrical device may also be rechargeable small household appliances (e.g., soymilk makers, robot vacuum cleaners), drones, and other electronic products. This application does not impose any special limitations on the specific form of the aforementioned electrical device.

[0112] The aforementioned electrical equipment may include a housing, a motherboard, and the aforementioned battery assembly. Both the motherboard and the battery assembly are installed in the housing. The battery assembly is connected to the motherboard, and the motherboard of the electrical equipment can uniformly control the battery assembly.

[0113] As described above, the battery assembly disclosed in this application improves upon related technologies. The battery assembly includes a first cell 110, a second cell 120, and a battery protection board 130. The first cell 110 and the second cell 120 are arranged side-by-side, with an installation gap 140 between them. The battery protection board 130 includes a functional part 131 and a connecting part 132. The functional part 131 implements the protection function of the battery protection board 130. The functional part 131 is connected to the connecting part 132, which is electrically connected to the first tab 111 of the first cell 110 and the second tab 121 of the second cell 120, thereby connecting the functional part 131 to the first cell 110 and the second cell 120. When installing the battery protection board 130, at least a portion of the functional part 131 can be placed in the installation gap 140, and the connecting part 132 can be placed outside the installation gap 140, so as to realize the distributed installation of the functional part 131 and the connecting part 132. This can avoid the situation where the battery assembly has an excessively large local volume due to the stacking of components, thereby reducing the probability of the battery protection board 130 being squeezed, collided, or scratched. At the same time, the first cell 110 and the second cell 120 can also shield and protect the functional part 131, further reducing the probability of damage to the battery protection board 130 and improving the service life of the battery assembly.

[0114] Batteries are typically constructed by soldering cells to a PCM (Protection Circuit Module, or battery protection board) and then encapsulating them in an insulating manner. In related technologies, to increase cell capacity without increasing encapsulation space, the PCB board in the PCM is usually changed from being laid flat to being perpendicular to the length of the cell, in order to reduce the space occupied by the PCM in the length direction of the cell. However, when the PCM is connected to multiple cells, the PCM needs to make corresponding clearances between the side seals of two adjacent cells. The PCB board in this clearance area of ​​the PCM is thin and narrow, making it susceptible to bending or breakage due to mechanical stress.

[0115] In view of the above-mentioned technical problems, this application also provides a battery protection board, a battery pack and an electrical device, which can reduce the occurrence of bending or breakage of the battery protection board when connected to the battery cell, so as to at least partially solve the above-mentioned technical problems.

[0116] A first aspect of this application provides a battery protection board, as shown in Figures 14 to 18, wherein the battery protection board includes a PCB board 8 and a reinforcing member 9, wherein the PCB board 8 includes at least two main body portions 810 and at least one clearance portion 820, the clearance portion 820 being located between two adjacent main body portions 810, the main body portion 810 having a pad 811 for connecting a battery cell 10, and the clearance portion 820 having a clearance notch 821 for clearance of the sealing structure of the battery cell 10; the reinforcing member 9 is connected to the clearance portion 820 and has a shape similar to the clearance notch 821.

[0117] With the above-described technical solution, namely the battery protection board provided in this application, when the battery protection board is connected to the cell 10, a reinforcing member 9 with a shape similar to the clearance notch 821 can be connected to the clearance portion 820 to reinforce the area of ​​the clearance portion 820 where the width and thickness are small. When the battery protection board is connected to multiple cells 10, it can be connected to the tabs of the cell 10 through the solder pads 811 on the main body 810, and the clearance notch 821 can be used to avoid the side sealing edge between two adjacent cells 10. In this connection method, the capacity of the cell 10 can be increased without increasing the battery packaging space. Furthermore, the reinforcement of the clearance portion 820 by the reinforcing member 9 can also reduce the occurrence of bending or breakage of the battery protection board when it is connected to the cell.

[0118] It should be noted that the reinforcing member 9 mentioned in the above embodiments specifically reinforces the area of ​​the narrow-width and thin-thickness clearance portion 820. As shown in Figures 15 to 17, in this battery protection board, since the clearance portion 820 serves to avoid the side sealing edge of the battery cell, its width and thickness are relatively small compared to the main body portion 810. Therefore, when the battery protection board is connected to multiple battery cells 10, the bending resistance of the clearance portion 820 itself is slightly insufficient compared to the main body portion 810. Therefore, the clearance portion 820 can be thickened and reinforced by the reinforcing member 9 mentioned in the above embodiments to improve the bending resistance of the clearance portion 820 itself, thereby reducing the bending and breakage of the battery protection board.

[0119] Furthermore, the reinforcing member 9 mentioned in the above embodiments can be any suitable component structure that can be connected to the clearance portion 820. For example, the reinforcing member 9 can be a reinforcing rib or a sheet structure. In addition, depending on the structure of the side sealing edge of the battery cell 10, the specific shapes of the reinforcing member 9 and the clearance notch 821 can also be adapted. Specifically, this application will provide detailed examples of the specific structure of the reinforcing member 9 below, without further limitation.

[0120] In some embodiments, as shown in Figures 14 to 17, the clearance portion 820 includes a first surface 822 facing the battery cell 10 and a second surface 823 facing away from the battery cell 10, and at least one of the first surface 822 and the second surface 823 is connected to a reinforcing member 9.

[0121] In the above manner, the reinforcing member 9 can be arranged on one side of the clearance portion 820 or on both sides of the clearance portion 820 to thicken and reinforce the clearance portion 820, which has a small width and thickness. It can be understood that, under the premise that the internal packaging space of the battery pack remains unchanged, when the capacity of the battery cell 10 meets the actual usage size, the reinforcing member 9 can be arranged on both sides of the clearance portion 820 to maximize the bending resistance of the clearance portion 820. However, when the capacity of the battery cell 10 does not meet the actual usage size, it is necessary to further increase the space ratio of the battery cell 10 within the battery pack. In this case, the reinforcing member 9 can be arranged on one side of the clearance portion 820, that is, sacrificing some of the bending resistance of the clearance portion 820 to increase the space ratio of the battery cell 10. Both of the above methods can be selected reasonably according to the actual situation, and this embodiment does not make specific limitations on this.

[0122] In some embodiments, referring to Figures 14 to 18, the clearance portion 820 is constructed as a U-shaped groove, and the clearance notch 821 is formed in the space defined by the inner sidewall of the U-shaped groove; the reinforcement 9 is constructed as a U-shaped plate, and the sidewall of the U-shaped plate is attached to at least one of the first surface 822 and the second surface 823 of the U-shaped groove.

[0123] By constructing the clearance portion 820 as a U-shaped groove and the reinforcing member 9 as a U-shaped plate in the above manner, the clearance notch 821 formed on the inner sidewall of the U-shaped groove allows the side sealing edges between multiple battery cells 10 to pass through the clearance notch 821 to form clearance, and the U-shaped plate is attached to the U-shaped groove for thickening and reinforcement, thereby further enhancing the bending resistance of the clearance portion 820.

[0124] It should be noted that the reinforcing member 9, which is constructed as a U-shaped plate, can also be flexibly changed in shape according to the specific different shapes of the U-shaped groove. For example, Figure 18 shows various suitable deformation methods of the reinforcing member 9 when it is a U-shaped plate. Those skilled in the art can select a suitable U-shaped plate to reinforce the U-shaped groove according to the various specific reinforcement requirements of the U-shaped groove. This embodiment does not make specific limitations in this regard.

[0125] In some embodiments, as shown in Figures 14 to 18, the thickness of the reinforcing member 9 in the direction from the first surface 822 toward the second surface 823 is not less than 0.1 mm.

[0126] In this way, the minimum thickness of the reinforcing member 9 is 0.1 mm, which can ensure that the reinforcing member 9 provides a minimum reinforcement effect for the avoidance part 820, and can also minimize the space occupied by the battery protection board in the battery pack, so as to maximize the capacity of the cell 10 in the battery pack.

[0127] It should be noted that the above embodiments are merely illustrative examples of the thickness of the reinforcing member 9. It can be understood that, while maximizing the capacity of the cell 10 within the battery pack, the thickness of the reinforcing member 9 can be any suitable thickness greater than 0.1 mm. For example, 0.2 mm, 0.3 mm, or other suitable thicknesses can be used. This embodiment does not impose any specific limitations on this.

[0128] In some embodiments, referring to Figures 15 to 17, the reinforcement 9 is located within the circumferential profile of the first surface 822 or the second surface 823.

[0129] With the above arrangement, when the reinforcing member 9 is connected to the PCB board 8, the edge of the reinforcing member 9 can always be located within the circumferential contour of the first surface 822 or the second surface 823 of the PCB board 8. Under this arrangement, when the battery protection board is connected to the cell 10 as a whole, the reinforcing member 9 will not interfere with the PCB board 8 and the cell 10, thereby improving the reasonable coordination of the connection between the battery protection board and the cell 10, and also facilitating the subsequent encapsulation of the battery pack.

[0130] In some embodiments, referring to Figures 14 to 17, the minimum distance between the edge of the reinforcing member 9 and the circumferential profile of the first surface 822 or the second surface 823 is not less than 0.2 mm.

[0131] In this way, the edge of the reinforcing member 9 always maintains a gap of no less than 0.2mm with the circumferential contour of the PCB board 8 on the first surface 822 or the second surface 823. This can not only reinforce the weak areas of the PCB board 8 through the reinforcing member 9, but also reduce or avoid the situation where the edge of the reinforcing member 9 is too close to the edge of the PCB board 8, which would cause difficulties in processing or connection.

[0132] In some embodiments, referring to Figures 14 to 18, the reinforcing member 9 is made of at least one of nickel alloy, copper alloy, aluminum alloy, stainless steel, titanium alloy, polyimide (PI), polyester (PET), carbon fiber composite material, and glass fiber.

[0133] Through the specific methods described above, the reinforcing member 9 made of any of the aforementioned materials can improve its own structural strength. Consequently, when the reinforcing member 9 is connected to the clearance portion 820 of the PCB board 8, it can also improve the reinforcement effect at the clearance portion 820. Furthermore, the reinforcing member 9 can be manufactured from one of the aforementioned materials or from a composite of multiple materials. For example, when the reinforcing member 9 is made of a composite of titanium alloy and glass fiber, it can improve the structural strength and bending resistance of the reinforcing member 9, as well as its lightweight nature.

[0134] In some embodiments, as shown in Figures 14 to 16, the number of pads 811 is multiple and they are arranged at intervals on the main body 810.

[0135] In the above manner, the connection stability between the battery protection board and the battery cell 10 can be improved by using multiple solder pads 811. For example, multiple solder pads 811 can be soldered to the tabs 310 of the battery cell 10 one by one, thereby providing normal overcharge, over-discharge current protection and over-temperature protection for the battery cell 10, so as to improve the safety performance of the battery cell 10 during operation.

[0136] A second aspect of this application provides a battery pack including a battery cell 10 and a battery protection board mentioned in the above specific embodiments, and having all the beneficial effects of the above specific embodiments, wherein the battery protection board can be soldered to the tabs 310 of the battery cell 10 via solder pads 811.

[0137] In the above manner, when the battery pack uses the battery protection board, the bending resistance of the battery protection board can be improved after the battery pack itself is encapsulated. Furthermore, by connecting the battery protection board to the battery cell perpendicular to the length of the cell, the space occupied by the battery protection board in the battery pack can be further saved, thereby increasing the capacity of the battery cell 10 in the battery pack and improving the battery pack's power consumption range.

[0138] A third aspect of this application provides an electrical device that includes the battery pack mentioned in the above embodiments and has all the beneficial effects described in the specific embodiments. In this embodiment, the electrical device can be any device that can be charged and discharged by the battery pack. For example, the electrical device can be a smartphone, tablet computer, walkie-talkie, etc. in communication devices, or an LED lamp in lighting devices, or any suitable electrically driven device such as an industrial robot, motor driver, frequency converter, or actuator in industrial control devices. As long as those skilled in the art can apply the battery pack to different suitable types of devices in any suitable scenario, this embodiment does not impose excessive limitations on the electrical device.

[0139] A battery protection circuit module (PCM) is a crucial component that protects batteries from damage caused by overcharging, over-discharging, and short circuits. A PCM consists of a flexible printed circuit (FPC) and a printed circuit board (PCB). The PCB has nickel strips for connecting to the tabs of the battery cells, thus establishing the connection between the PCM and the cells.

[0140] However, nickel plates occupy space on the printed circuit board, reducing the space for components on the printed circuit board and making the overcurrent effect of the battery protection board poor. This results in relatively poor heat dissipation of the battery and a higher temperature rise.

[0141] In view of this, this application also provides a battery protection board and a battery to solve the problems that nickel sheets occupy space on the printed circuit board, reduce the space of components on the printed circuit board, and result in poor overcurrent performance of the battery protection board, which leads to relatively poor heat dissipation and high temperature rise of the battery.

[0142] According to one aspect of this application, a battery protection board is provided, as shown in Figures 19 to 22. The battery protection board includes a first printed circuit board 16, a second printed circuit board 17, a flexible circuit board 18, and a connecting assembly 20. The connecting assembly 20 includes a positive electrode connector 2001 and a negative electrode connector 2002. The first printed circuit board 16 and the second printed circuit board 17 are spaced apart along a first direction. The flexible circuit board 18 includes a bonding portion 181 and an extension portion 182 connected to each other. The bonding portion 181 has two opposite sides in the first direction that are bonded to the first printed circuit board 16 and the second printed circuit board 17, respectively. The extension portion 182 protrudes relative to the first printed circuit board 16 and the second printed circuit board 17. The extension portion includes two mounting surfaces opposite to each other in the first direction. The positive electrode connector 2001 and the negative electrode connector 2002 are disposed on the same mounting surface and are used to connect to the positive electrode tab 211 and the negative electrode tab 212 of the battery cell 21, respectively. Thus, the surfaces of the first printed circuit board 16 and the second printed circuit board 17 facing away from the bonding portion 181 can both be used to mount electronic components. This increases the mounting space, improves the overcurrent effect of the battery protection board, and further improves the heat dissipation effect of the battery, thereby reducing the temperature rise of the battery.

[0143] In embodiments of this application, as shown in Figures 19 and 20, the flexible circuit board 18 further includes a bending portion 183. One end of the bending portion 183 in the second direction N is connected to the extension portion 182, and the second direction N intersects the first direction. The other end of the bending portion 183 is connected to the bonding portion 181. The bending portion 183 also protrudes relative to the first printed circuit board 16 and the second printed circuit board 17. The bending portion 183 can be bent so that the bonding portion 181 is parallel to the extension portion 182. In this way, the first printed circuit board 16, the second printed circuit board 17, the bonding portion 181, and the extension portion 182 are stacked, thereby reducing the space occupied by the battery protection board.

[0144] In some examples, the bend 183 is made of mesh copper.

[0145] As shown in Figures 20 and 23, positive electrode connector 2001 and negative electrode connector 2002 are spaced apart along a third direction W on the extension 182. The third direction W intersects the plane defined by the first direction and the second direction N. The positive electrode connector 2001 and negative electrode connector 2002 are respectively used to connect to the positive electrode tab 211 and the negative electrode tab 212 of the same cell 21, thereby realizing the connection between the battery protection board and the cell 21. In some examples, the first direction, the second direction N, and the third direction W are perpendicular to each other.

[0146] In some examples, both the positive electrode connector 2001 and the negative electrode connector 2002 can be nickel sheets.

[0147] In some embodiments, the first printed circuit board 16 and the second printed circuit board 17 are respectively located on both sides of the bonding portion 181. The first printed circuit board 16 and the second printed circuit board 17 are pressed together to fix the bonding portion 181, the first printed circuit board 16, and the second printed circuit board 17. The dimension of the bonding portion 181 in the second direction N is less than or equal to the dimension of the first printed circuit board 16 in the second direction N, and the dimension of the bonding portion 181 in the third direction W is less than or equal to the dimension of the first printed circuit board 16 in the third direction W; the dimension of the bonding portion 181 in the second direction N is less than or equal to the dimension of the second printed circuit board 17 in the second direction N, and the dimension of the bonding portion 181 in the third direction W is less than or equal to the dimension of the second printed circuit board 17 in the third direction W, so that the bonding portion 181 is entirely located between the first printed circuit board 16 and the second printed circuit board 17.

[0148] Optionally, the battery protection board of this application can be applied to single-cell batteries or multi-cell batteries. The number of connecting components 20 in the battery protection board is the same as the number of cells 21 included in the battery. For example, when the battery includes one cell 21, one connecting component 20 is provided on the extension 182, that is, a positive electrode connector 2001 and a negative electrode connector 2002 are provided on the extension 182. The positive electrode connector 2001 and the negative electrode connector 2002 are respectively connected to the positive electrode tab 211 and the negative electrode tab 212 in the cell 21. When the battery includes two cells 21, two connecting components 20 are provided on the extension 182. The two connecting components 20 are arranged at intervals along the third direction W, so that the positive electrode connector 2001 and the negative electrode connector 2002 are alternately arranged. The two positive electrode connectors 2001 are connected to the two positive electrode tabs 211 in the two cells 21, and the two negative electrode connectors 2002 are connected to the two negative electrode tabs 212 in the two cells 21.

[0149] As shown in Figure 20, the flexible circuit board 18 includes a first notch 184. The first notch 184 is located on the side of the extension 182 facing away from the bending portion 183 in the second direction N, and the first notch 184 is recessed towards the interior of the flexible circuit board 18. In other words, from the perspective of Figure 20, the first notch 184 is recessed upward from the lower end of the extension 182. The dimension a of the first notch 184 in the second direction N is greater than the dimension b of the extension 182 in the second direction N, and the dimension a of the first notch 184 in the second direction N is less than or equal to the sum of the dimension b of the extension 182 in the second direction N and the dimension c of the bending portion 183 in the second direction N, i.e., b < a ≤ b + c. This allows the first notch 184 to extend into the interior of the bending portion 183, reducing the dimension of part of the bending portion 183 in the second direction N, which facilitates bending of the bending portion 183. In some examples, the dimension of the first notch 184 in the second direction N is equal to the sum of the dimension of the extension 182 in the second direction N and the dimension of the bend 183 in the second direction N. This breaks the bend 183 into multiple parts, further improving the ease of bending the bend 183.

[0150] In some examples, the first notch 184 may be located between the positive connector 2001 and the negative connector 2002 included in the connection assembly 20, and the number of first notches 184 may be the same as the number of connection assemblies 20.

[0151] Furthermore, as shown in Figures 21 and 22, the first printed circuit board 16 and the second printed circuit board 17 respectively have a first recess 161 and a second recess 162. As shown in Figure 20, the mating portion 181 has a second notch 185, which is located on the side of the mating portion 181 opposite to the bent portion 183 in the second direction N, and the second notch 185 is recessed towards the interior of the bent portion 183. In other words, from the perspective of Figure 20, the second notch 185 is recessed downward from the upper end of the mating portion 181. The positions of the first recess 161, the second recess 162, and the second notch 185 correspond, and the first recess 161, the second recess 162, and the second notch 185 are used to engage with the protrusions on the electronic device where the battery is located. The second notch 185 is offset from the first notch 184 in the third direction W. That is, the first notch 184 is not provided at the position of the flexible circuit board 18 in the third direction W corresponding to the second notch 185, so as to avoid the flexible circuit board 18 appearing in the smaller part in the second direction N, thereby reducing the risk of the flexible circuit board 18 breaking.

[0152] In embodiments of this application, the battery protection board further includes a connecting plate 19, and one of the first printed circuit board 16 and the second printed circuit board 17 is connected to the connecting plate 19. The connecting plate 19 can be used for external connections of the battery protection board.

[0153] In some examples, a pad 162 is provided on the side of the first printed circuit board 16 facing away from the bonding portion 181, and the connecting plate 19 is soldered to the pad 162 to achieve the connection between the first printed circuit board 16 and the connecting plate 19.

[0154] In this application, the surfaces of the first printed circuit board 16 and the second printed circuit board 17 facing away from the bonding portion 181 in the battery protection board can both be used to mount electronic components. This increases the mounting space, improves the overcurrent effect of the battery protection board, and thus improves the heat dissipation effect of the battery and reduces the temperature rise of the battery.

[0155] According to another aspect of this application, a battery is provided, which includes the battery protection board described above and has the same technical effects as the battery protection board described above, which will not be repeated here.

[0156] In some embodiments, the battery also includes a cell 21, which includes a positive tab 211 and a negative tab 212. The positive tab 211 and the negative tab 212 are respectively connected to the positive connector 2001 and the negative connector 2002, thereby realizing the connection between the cell 21 and the battery protection board.

[0157] Optionally, the number of battery cells 21 in the battery can be selected according to requirements, for example, the number of battery cells 21 can be one, two, three or more. When the number of battery cells 21 is one, only one connecting component 20 is provided in the battery protection board; when the number of battery cells 21 is multiple, that is, when the number of battery cells 21 is two or more, multiple connecting components 20 are spaced apart in the extension 182, and multiple battery cells 21 correspond one-to-one with multiple connecting components 20. The positive electrode tab 211 of the battery cell 21 is connected to the positive electrode connector 2001 of the connecting component 20 corresponding to the battery cell 21, and the negative electrode tab 212 of the battery cell 21 is connected to the negative electrode connector 2002 of the connecting component 20 corresponding to the battery cell 21.

[0158] The above embodiments of this application focus on describing the differences between the various embodiments. As long as the different technical features between the various embodiments are not contradictory, they can be combined to form more specific embodiments. For the sake of brevity, they will not be described in detail here.

Claims

1. A battery having intersecting first and second directions, the battery comprising: A battery cell assembly includes at least two battery cells, the at least two battery cells being arranged side by side along a first direction, the battery cells having a tab side and a non-tab side disposed along a second direction; A protection circuit module is disposed on the tab side. The protection circuit module includes a first circuit board and at least two second circuit boards. The thickness directions of the second circuit boards and the first circuit board are parallel to the second direction. The at least two second circuit boards are disposed corresponding to the tab sides of at least two of the battery cells. The first circuit board spans across the tab sides of at least two adjacent battery cells and is connected to at least two adjacent second circuit boards. A clearance space is formed between two second circuit boards corresponding to the side packaging of the middle part of any two adjacent battery cells. The clearance space is used to avoid the side packaging of the middle part of two adjacent battery cells.

2. The battery according to claim 1, wherein, The first circuit board is disposed on the side of the second circuit board away from the battery cell, and the second circuit board is disposed on the side facing the battery cell, which has a first type of component.

3. The battery according to claim 2, wherein, The first circuit board has a first surface facing the battery cell. The battery cell includes a battery cell body and a packaging structure that encapsulates the battery cell body. The first surface, the second circuit board, and the packaging structure enclose an installation space. A second type of component is fixed on the first surface and located in the installation space. The height of the second type of component along the second direction is higher than the height of the first type of component.

4. The battery according to claim 2, wherein, The first circuit board has a second surface facing away from the second circuit board, and the second surface is provided with a welding tab for welding the electrode tabs of the battery cell.

5. The battery according to claim 4, wherein, The thickness of the welding sheet is 0.1mm-0.5mm, and / or the thickness of the first circuit board is 0.2mm-0.4mm.

6. The battery according to claim 2, wherein, The first circuit board has a second surface facing away from the second circuit board, and the second surface has a reinforcing sheet in the portion between two adjacent second circuit boards.

7. The battery according to claim 1, wherein, The first circuit board is disposed on the side of the second circuit board facing the battery cell, and components are disposed on the side of the second circuit board away from the battery cell. Along the second direction, the side of the first circuit board away from the battery cell is not higher than the side of the components away from the battery cell.

8. The battery according to any one of claims 1-7, wherein, The electrode side is injection molded with an injection molded part, which encapsulates the electrode of the protection circuit module and the battery cell, and / or the second circuit board and the components disposed on the second circuit board are encapsulated by a plastic encapsulation process.

9. A battery assembly, comprising: First battery cell; The second battery cell is arranged side by side with the first battery cell and there is an installation gap between the first battery cell and the second battery cell; A battery protection board includes a functional part and a connecting part. At least a portion of the functional part is disposed in the mounting gap, and the connecting part is disposed outside the mounting gap. The functional part is connected to the connecting part, and the connecting part is electrically connected to the first tab of the first battery cell and the second tab of the second battery cell, respectively.

10. The battery assembly according to claim 9, wherein, The functional part has a connecting end that extends out of the mounting gap, and the connecting end is connected to the connecting part.

11. The battery assembly according to claim 9, wherein, The functional unit includes a rigid board and a battery protection device, the battery protection device being electrically connected to the surface of the rigid board and located in the mounting gap.

12. The battery assembly of claim 10, wherein, The connecting part includes a first flexible board and a second flexible board. The first tab is disposed at the mounting end of the first battery cell, and the second tab is disposed at the mounting end of the second battery cell. The first flexible board is disposed opposite to the mounting ends of the first battery cell and the second battery cell, and is electrically connected to the first tab and the second tab, respectively. One end of the second flexible board is connected to the first flexible board, and the other end of the second flexible board is connected to the connecting end.

13. The battery assembly according to claim 12, wherein, The first flexible circuit board includes a first end and a second end that are opposite to each other, with the first end close to the first battery cell and the second end close to the second battery cell. At least one of the first end and the second end is provided with a connector.

14. The battery assembly according to claim 13, wherein, The first end is provided with a first bending section, which bends away from the first battery cell; the second end is provided with a second bending section, which bends away from the second battery cell. The connector is provided at the end of both the first bent section and the end of the second bent section.

15. The battery assembly according to claim 12, wherein, The first flexible circuit board has a first tab pad and a second tab pad on the surface near the first battery cell and the second battery cell, respectively. The first tab pad is electrically connected to the first tab, and the second tab pad is electrically connected to the second tab.

16. The battery assembly of claim 15, wherein, The first electrode includes a first positive electrode and a first negative electrode, and the second electrode includes a second positive electrode and a second negative electrode. The first electrode pad includes a first positive electrode pad and a first negative electrode pad, and the second electrode pad includes a second positive electrode pad and a second negative electrode pad; The first positive tab pad is electrically connected to the first positive tab, the first negative tab pad is electrically connected to the first negative tab, the second positive tab pad is electrically connected to the second positive tab, and the second negative tab pad is electrically connected to the second negative tab.

17. The battery assembly according to claim 9, wherein, The first battery cell has a first side near the second battery cell, and the second battery cell has a second side near the first battery cell. The first side and the second side are spaced apart to form the mounting gap. Along the perpendicular line connecting the first side and the second side, the size of the mounting gap is larger than the size of the functional part.

18. An electrical device comprising a device housing, a motherboard, and a battery assembly according to any one of claims 9-17, wherein the motherboard and the battery assembly are both mounted in the device housing, and the battery assembly is connected to the motherboard.

19. A battery protection board, comprising: A PCB board includes at least two main bodies and at least one clearance portion, the clearance portion being located between any two adjacent main bodies, the main bodies having pads for connecting battery cells, and the clearance portion having clearance notches for clearance of the sealing edge structure for clearance of the battery cells; A reinforcing member is connected to the clearance portion and has a shape similar to that of the clearance notch.

20. The battery protection board according to claim 19, wherein, The clearance portion includes a first side facing the battery cell and a second side facing away from the battery cell, and at least one of the first side and the second side is connected to the reinforcing member.

21. The battery protection board according to claim 20, wherein, The clearance portion is constructed as a U-shaped groove, and the clearance notch is formed in the space defined by the inner sidewall of the U-shaped groove; The reinforcing member is constructed as a U-shaped plate, and the sidewall of the U-shaped plate is attached to at least one of the U-shaped groove located on the first surface and the second surface.

22. The battery protection board according to claim 21, wherein, The thickness of the reinforcing member in the direction from the first surface to the second surface is not less than 0.1 mm.

23. The battery protection board according to claim 22, wherein, The reinforcing member is located within the circumferential contour of the first or second surface.

24. The battery protection board according to claim 23, wherein, The minimum distance between the edge of the reinforcing member and the circumferential contour of the first or second surface is not less than 0.2 mm.

25. A battery pack, comprising a battery cell and a battery protection board as described in any one of claims 19-24, wherein the battery protection board is soldered to the tabs of the battery cell via pads; Alternatively, the battery pack may include the battery as described in any one of claims 1-8.

26. An electrical appliance comprising the battery pack as claimed in claim 25.

27. A battery protection board, comprising: First printed circuit board; Second printed circuit board; A connection component, comprising a positive electrode connector and a negative electrode connector, wherein the first printed circuit board and the second printed circuit board are spaced apart along a first direction; A flexible circuit board, the flexible circuit board including a bonding portion and an extension portion connected to each other, the bonding portion being bonded to a first printed circuit board and a second printed circuit board respectively on opposite sides in a first direction; The extension protrudes relative to the first printed circuit board and the second printed circuit board, and the extension includes two mounting surfaces that are opposite to each other in the first direction. The positive electrode connector and the negative electrode connector are both disposed on the same mounting surface.

28. The battery protection board according to claim 27, wherein, The flexible circuit board further includes a bending portion, one end of which is connected to the extension portion in a second direction, and the other end of which is connected to the bonding portion in the second direction. The bending portion is capable of bending so that the bonding portion is parallel to the extension portion, and the second direction intersects the first direction.

29. The battery protection board according to claim 28, wherein, The positive electrode connector and the negative electrode connector are spaced apart along a third direction, which intersects the plane determined by the first direction and the second direction.

30. The battery protection board according to claim 29, wherein, The flexible circuit board includes a first notch located at one end of the extension facing away from the bend in the second direction, and the first notch is recessed toward the interior of the flexible circuit board. The size of the first notch in the second direction is greater than the size of the extension in the second direction, and the size of the first notch in the second direction is less than or equal to the sum of the size of the extension in the second direction and the size of the bend in the second direction.

31. The battery protection board according to claim 30, wherein, The flexible circuit board includes a second notch located on the side of the bonding portion opposite to the bending portion in the second direction, and the second notch is recessed toward the interior of the bending portion. The position of the second notch in the third direction is offset from the position of the first notch in the third direction.

32. The battery protection board according to any one of claims 27-31, wherein, The battery protection board also includes a connecting plate, wherein one of the first printed circuit board and the second printed circuit board is connected to the connecting plate.

33. The battery protection board according to claim 32, wherein, A pad is provided on the side of either the first printed circuit board or the second printed circuit board that is opposite to the bonding portion, and the connecting plate is connected to the pad.

34. A battery comprising a battery protection board according to any one of claims 27-33; The battery also includes a battery cell, which includes a positive tab and a negative tab. The positive tab is connected to the positive connector, and the negative tab is connected to the negative connector.

35. The battery according to claim 34, characterized in that, The battery protection board includes multiple connecting components and multiple battery cells. The multiple connecting components are spaced apart on the extension. Each of the multiple battery cells corresponds to one of the multiple connecting components. The positive tab of each battery cell is connected to the positive terminal connector of the connecting component corresponding to the battery cell, and the negative tab of each battery cell is connected to the negative terminal connector of the connecting component corresponding to the battery cell.