Battery devices, circuit boards and electrical equipment

Abstract

This utility model discloses a battery device, a circuit board, and an electrical device. The battery device includes multiple battery cells arranged along a first direction and a circuit board. The circuit board (10) extends along the first direction and is electrically connected to multiple battery cells (120) arranged along the first direction. The circuit board (10) includes a body part (1), a strip-shaped connecting part (2), and an external part (3). The body part (1) has a notch that extends through the thickness direction of the circuit board (10). The strip-shaped connecting part (2) and the external part (3) are arranged side by side in the notch along the first direction. The external part (3) is used to connect the battery cells. The strip-shaped connecting part (2) is connected to the body part (1) and the external part (3). The strip-shaped connecting part (2) includes a curved structure with at least one bending segment (21). A weak connecting part (4) is located at the bending segment (21) of the strip-shaped connecting part (2) and connects the strip-shaped connecting part (2) to the body part (1) or the strip-shaped connecting part (2) and the external part (3).

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to a battery device, a circuit board, and an electrical appliance. Background Technology

[0002] Batteries are widely used in the new energy field, such as in electric vehicles and new energy vehicles, which have become a new trend in the automotive industry. To facilitate battery management, it is necessary to collect voltage and temperature data from each individual battery cell. Current technology typically uses circuit boards (e.g., PCBs) connected to each battery cell to collect these data. However, after a period of battery use, the circuit boards may detach from the battery cells, making it impossible to collect voltage and temperature data from the individual cells. Utility Model Content

[0003] The present invention aims to provide a battery device, circuit board, and electrical equipment to improve the problem of circuit board detachment from battery cells in related technologies.

[0004] According to one aspect of an embodiment of the present invention, a battery device is provided, the battery device comprising:

[0005] Multiple battery cells arranged along the first direction; and

[0006] A circuit board extends along a first direction and is electrically connected to a plurality of battery cells arranged along the first direction. The circuit board includes a body portion, a strip-shaped connecting portion, an external portion, and a weak connection portion. The body portion has a notch extending through the thickness direction of the circuit board. The strip-shaped connecting portion and the external portion are arranged side by side in the notch along the first direction. The external portion is used to connect the battery cells. The strip-shaped connecting portion is connected to the body portion and the external portion. The strip-shaped connecting portion includes a curved structure with at least one bending segment. The weak connection portion is located at the bending segment of the strip-shaped connecting portion and connects the strip-shaped connecting portion to the body portion or the strip-shaped connecting portion and the external portion.

[0007] In some embodiments, the strip-shaped connector is coiled within the notch to form at least one bend.

[0008] In some embodiments, the strip-shaped connecting portion includes multiple bends, and multiple weak connecting portions are provided, with at least one weak connecting portion provided at each bend.

[0009] In some embodiments, the strip-shaped connecting portion includes a plurality of strip segments connected sequentially along the length direction of the strip-shaped portion. The strip-shaped connecting portion is coiled within the notch to form a plurality of parallel strip segments arranged side by side along the width direction of the strip segments. A bent section is formed between two adjacent strip segments in the length direction of the strip-shaped connecting portion.

[0010] In some embodiments, the strip-shaped connecting portion includes a plurality of bent segments, the plurality of bent segments including a first bent segment and a second bent segment, the bending directions of the first bent segment and the second bent segment being opposite.

[0011] In some embodiments, the first bent section is adjacent to the outer portion, and the second bent section is adjacent to the body portion; the weak connection portion includes:

[0012] A first weak connection portion connects the first bent section and the outer portion; and / or

[0013] The second weak connection section connects the second bending section and the main body.

[0014] In some embodiments, the strip-shaped connecting portion coiled within the notch is arranged along a first direction with the outer portion, and the first bent segment and the second bent segment are connected by a strip-shaped segment extending along the first direction.

[0015] In some embodiments,

[0016] The first strip segment extends along the first direction, with one end connected to the main body and the other end connected to the first bent segment;

[0017] The second strip extends along the first direction, and one end of the second strip near its outer juncture is connected to one end of the first strip near its outer juncture via a first bend; and

[0018] The third strip extends along the first direction and is located on the side of the second strip away from the first strip. The end of the third strip away from the outer portion is connected to the end of the second strip away from the outer portion through the second bend. The end of the third strip close to the outer portion is connected to the outer portion.

[0019] In some embodiments, the circuit board is provided with a crack to distinguish the strip-shaped connecting portion, the body portion and the external portion, and a crack-stopping hole is provided at the end of the crack.

[0020] In some embodiments, the crack includes:

[0021] The first crack is located between the first strip segment of the strip-shaped connecting portion and the second strip segment parallel to the first strip segment;

[0022] The second crack is located between the third strip segment and the second strip segment, which are parallel to the second strip segment and situated on the side of the second strip segment away from the first strip segment in the strip-shaped connection portion;

[0023] The third crack is located between the third strip segment and the main body and is used to distinguish the main body and the third strip segment.

[0024] In some embodiments, weak connections are formed by interrupted cracks.

[0025] In some embodiments,

[0026] The strip-shaped connecting portion is coiled seamlessly within the notch; and / or

[0027] The strip-shaped connecting part abuts against the main body without gap; and / or

[0028] The strip-shaped connecting part and the outer part abut against each other without gap.

[0029] According to another aspect of the present invention, a circuit board is also disclosed. The circuit board includes a body portion, a strip-shaped connecting portion, an external connecting portion, and a weak connecting portion. The body portion has a notch that extends through the thickness direction of the circuit board. The strip-shaped connecting portion and the external connecting portion are arranged side by side in the notch along a first direction. The external connecting portion is used to connect a battery cell. The strip-shaped connecting portion is connected to the body portion and the external connecting portion. The strip-shaped connecting portion includes a curved structure with at least one bending segment. The weak connecting portion is located at the bending segment of the strip-shaped connecting portion and connects the strip-shaped connecting portion to the body portion or the strip-shaped connecting portion and the external connecting portion.

[0030] In some embodiments, the strip-shaped connecting portion includes a plurality of strip segments connected sequentially along the length direction of the strip-shaped portion. The strip-shaped connecting portion is coiled within the notch to form a plurality of parallel strip segments arranged side by side along the width direction of the strip segments. A bent section is formed between two adjacent strip segments in the length direction of the strip-shaped connecting portion.

[0031] In some embodiments, the strip-shaped connecting portion includes a plurality of bent segments, the plurality of bent segments including a first bent segment and a second bent segment, the first bent segment and the second bent segment being respectively disposed at both ends of the strip-shaped connecting portion coiled within the notch along a first direction, and the weak connecting portion including:

[0032] A first weak connection portion connects the first bent section and the outer portion; and / or

[0033] The second weak connection section connects the second bending section and the main body.

[0034] In some embodiments,

[0035] The strip-shaped connecting portion is coiled seamlessly within the notch; and / or

[0036] The strip-shaped connecting part abuts against the main body without gap; and / or

[0037] The strip-shaped connecting part and the outer part abut against each other without gap.

[0038] According to another aspect of the present invention, an electrical device is also disclosed, which includes the aforementioned battery device.

[0039] Applying the technical solution of this utility model, the strip-shaped connecting portion is bent and positioned within the notch, arranged along the first direction with the outer part. In its extended state, one end of the strip-shaped connecting portion is connected to the main body, and the other end is connected to the outer part. When a battery cell expands, the weak connecting portion can be broken by the expansion force of the battery cell. This allows the bent strip-shaped connecting portion within the notch to transition to an extended state. The extension of the strip-shaped connecting portion can counteract or absorb the expansion of the battery cell and maintain the connection between the main body and the outer part, ensuring that the circuit board continues to collect the current and / or voltage of the battery cell.

[0040] Other features and advantages of the present invention will become clear from the following detailed description of exemplary embodiments of the present invention with reference to the accompanying drawings. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 The diagram shows a structural schematic of an electrical device disclosed in some embodiments of this utility model;

[0043] Figure 2 An exploded structural diagram of a battery device disclosed in some embodiments of this utility model is shown;

[0044] Figure 3 The diagram shows a structural schematic of a battery cell disclosed in some embodiments of this utility model;

[0045] Figure 4 The diagram shows a structural illustration of a sampling circuit consisting of a circuit board, electrical connector, and adapter components located on a battery cell within a battery device, as disclosed in some embodiments of the present invention.

[0046] Figure 5 A top view of the sampling circuit of a battery device disclosed in some embodiments of this utility model is shown;

[0047] Figure 6 The diagram shows a side view of the sampling circuit of a battery device disclosed in some embodiments of the present invention;

[0048] Figure 7 It shows Figure 5 A magnified view of a section at point A in the middle;

[0049] Figure 8 It shows Figure 5 A magnified view of a section at point A in the middle;

[0050] Figure 9 The diagram shows a schematic of the circuit board of a battery device disclosed in some embodiments of the present invention after the weak connection of the battery cell breaks after expansion.

[0051] In the picture:

[0052] 1000, Vehicle; 100, Battery assembly; 110, Housing; 111, First part; 112, Second part; 120, Battery cell; 121, End cap; 121a, Electrode terminal; 122, Housing; 123, Cell assembly; 123a, Tab; 200, Controller; 300, Motor; 10, Circuit board; 20, Electrical component; 30, Adapter; 1, Main body; 2, Strip-shaped connecting part; 21, Bending section; 211, First bending section; 212, Second bending section; 22, Strip-shaped section; 221, First strip-shaped section; 22, Second strip-shaped section; 23, Third strip-shaped section; 3 41. External connection part; 42. First weak connection part; 43. Second weak connection part; 5. Crack; 51. First crack; 511. Third crack segment; 512. Fourth crack segment; 52. Second crack; 521. First crack segment; 522. Second crack segment; 53. Third crack; 531. Fifth crack segment; 532. Sixth crack segment; 533. Seventh crack segment; 61. Third crack-stopping hole; 62. Fourth crack-stopping hole; 63. Fifth crack-stopping hole; 65. First crack-stopping hole; 66. Second crack-stopping hole; 64. Sixth crack-stopping hole; 71. First recessed part; 72. Second recessed part; 8. Weak connection structure. Detailed Implementation

[0053] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0054] In the description of this utility model, it should be noted that, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," and "outer," etc., indicating orientation or positional relationships, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable error range. "Parallel" is not parallel in the strict sense, but within the allowable error range.

[0055] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the specific structure of this utility model. It should also be noted in the description of this utility model that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0056] Furthermore, the "range" disclosed in this invention is defined in the form of a lower limit and an upper limit. A given range is defined by selecting a lower limit and an upper limit, which define the boundaries of the particular range. Ranges defined in this way can include or exclude endpoints and can be arbitrarily combined; that is, any lower limit can be combined with any upper limit to form a range. For example, if ranges of 60-120 and 80-110 are listed for specific parameters, it is understood that ranges of 60-110 and 80-120 are also expected. Furthermore, if minimum range values ​​1 and 2 are listed, and if maximum range values ​​3, 4, and 5 are listed, then the following ranges are all expected: 1-3, 1-4, 1-5, 2-3, 2-4, and 2-5. In this invention, unless otherwise stated, the numerical range "ab" represents a shortened representation of any combination of real numbers between a and b, where a and b are real numbers. For example, the numerical range "0-5" indicates that all real numbers between "0-5" have been listed in this article; "0-5" is simply a shortened representation of these numerical combinations. Furthermore, when a parameter is stated as an integer ≥2, it is equivalent to disclosing that the parameter is, for example, an integer such as 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0057] Unless otherwise specified, all embodiments and optional embodiments of this utility model can be combined with each other to form new technical solutions.

[0058] Unless otherwise specified, all technical features and optional technical features of this utility model can be combined to form new technical solutions.

[0059] Unless otherwise specified, all steps of this invention can be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the method may also include step (c), indicating that step (c) can be added to the method in any order. For example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0060] Unless otherwise specified, the terms "comprising" and "including" as used in this invention can be open-ended or closed-ended. For example, "comprising" and "including" can mean that other components not listed may also be included, or that only the listed components may be included.

[0061] Unless otherwise specified, the term "or" is inclusive in this invention. For example, the phrase "A or B" means "A, B, or both A and B". More specifically, the condition "A or B" is satisfied by any of the following conditions: A is true (or exists) and B is false (or does not exist); A is false (or does not exist) and B is true (or exists); or both A and B are true (or exist).

[0062] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0063] Figure 1 A schematic diagram of an electrical device that uses a battery as a power source is shown; for example... Figure 1As shown, the electrical equipment in this embodiment includes a vehicle 1000, which can be a pure electric vehicle, a hybrid electric vehicle, or a range-extended electric vehicle, etc. A battery device 100 is installed inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0064] In some embodiments of this utility model, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0065] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 100 provided in some embodiments of the present invention. The battery device 100 includes a housing 110 and a battery module disposed within the housing 110. The battery module includes a plurality of battery cells 120, which are housed within the housing 110. The housing 110 provides a receiving space for the battery cells 120, and the housing 110 can adopt various structures. In some embodiments, the housing 110 may include a first portion 111 and a second portion 112, which overlap each other, and together define a receiving space for accommodating the battery cells 120. The second part 112 can be a hollow structure with one end open, and the first part 111 can be a plate-like structure. The first part 111 covers the open side of the second part 112 so that the first part 111 and the second part 112 together define the accommodating space. Alternatively, the first part 111 and the second part 112 can both be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the box 110 formed by the first part 111 and the second part 112 can be of various shapes, such as a cylinder, a cuboid, etc.

[0066] In the battery device 100, there can be multiple battery cells 120. These multiple battery cells 120 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 120 are connected in both series and parallel. Multiple battery cells 120 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 120 is housed within the housing 110. Alternatively, the battery device 100 can also consist of multiple battery cells 120 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is also housed within the housing 110. The battery device 100 may also include other structures; for example, the battery device 100 may also include a busbar component for realizing the electrical connection between the multiple battery cells 120.

[0067] Each battery cell 120 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 120 can be cylindrical, flat, cuboid, or other shapes.

[0068] Please refer to Figure 3 , Figure 3 This is an exploded structural diagram of a battery cell 120 provided in some embodiments of the present invention. The battery cell 120 refers to the smallest unit constituting the battery device 100. For example... Figure 3 The battery cell 120 includes an end cap 121, a housing 122, a cell assembly 123, and other functional components.

[0069] End cap 121 refers to a component that covers the opening of housing 122 to isolate the internal environment of battery cell 120 from the external environment. The shape of end cap 121 can be adapted to the shape of housing 122 to fit it. Optionally, end cap 121 can be made of a material with certain hardness and strength, such as aluminum alloy, so that end cap 121 is less prone to deformation under pressure and impact, giving battery cell 120 higher structural strength and improved safety performance. Functional components such as electrode terminals 121a can be provided on end cap 121. Electrode terminals 121a can be used for electrical connection with cell assembly 123 for outputting or inputting electrical energy from battery cell 120. In some embodiments, end cap 121 can also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of battery cell 120 reaches a threshold. The end cap 121 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present invention does not impose any special limitations on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap 121. The insulating member can be used to isolate the electrical connection components inside the housing 122 from the end cap 121 to reduce the risk of short circuit. For example, the insulating member can be plastic, rubber, etc.

[0070] The housing 122 is a component used to cooperate with the end cap 121 to form the internal environment of the battery cell 120, wherein the formed internal environment can accommodate the cell assembly 123, electrolyte, and other components. The housing 122 and the end cap 121 can be independent components. An opening can be provided on the housing 122, and the end cap 121 can be used to close the opening to form the internal environment of the battery cell 120. Alternatively, the end cap 121 and the housing 122 can be integrated. Specifically, the end cap 121 and the housing 122 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 122, the end cap 121 closes the housing 122. The housing 122 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 122 can be determined according to the specific shape and size of the cell assembly 123. The shell 122 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. This embodiment of the utility model does not impose any special restrictions on this.

[0071] The cell assembly 123 is the component in the battery cell 120 where the electrochemical reaction takes place. The housing 122 may contain one or more cell assemblies 123. The cell assembly 123 is mainly formed by winding or stacking electrode sheets, wherein the electrode sheets include positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets.

[0072] The electrode mainly consists of a thin sheet-like current collector and an active material coated on the current collector. The portions of the positive electrode (cathode electrode) and negative electrode (anode electrode) containing active material constitute the main body of the battery cell assembly, while the portions of the positive and negative electrodes without active material each constitute tabs 123a. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery device 100, the positive and negative active materials react with the electrolyte, and the tabs 123a connect to the electrode terminals to form a current loop.

[0073] Combination Figures 4 to 6 As shown, to facilitate battery management, it is necessary to collect voltage and / or current data for each battery cell 120. Generally, a circuit board 10 is connected to each battery cell 120 to collect voltage and / or current data. Specifically, a flexible current plate 10 is placed over multiple battery cells 120 arranged side by side, and the electrode terminals of two battery cells are connected by an electrical component 20 (e.g., an electrical connector). The circuit board 10 is connected to the aforementioned electrical component 20 via an adapter 30 to collect the current and / or voltage of the battery cells.

[0074] However, during the charging and discharging process, the chemical reaction of the battery cell 120 causes a change in its volume, resulting in relative stress at the connection between the circuit board 10 and the battery cell 120. As the battery is used for a longer period of time, the battery cell 120 will undergo significant expansion and displacement. When the expansion reaches a certain extent, the sampling connection of the circuit board 10 may experience tearing, detachment, or other failures, making it impossible to collect voltage and temperature data from the battery cell.

[0075] To address the aforementioned issues, this embodiment provides a battery device comprising a plurality of battery cells 120 arranged along a first direction and a circuit board 10. The circuit board 10 extends along the first direction and is electrically connected to the plurality of battery cells 120 arranged along the first direction. The circuit board may be a flexible printed circuit (FPC).

[0076] See further Figures 7 to 9 The circuit board of this embodiment includes a circuit board 10 including a body portion 1, a strip-shaped connecting portion 2, an external connecting portion 3, and a weak connecting portion 4. The body portion 1 has a notch that extends through the thickness direction of the circuit board 10. The strip-shaped connecting portion 2 and the external connecting portion 3 are arranged side by side in the notch along a first direction. The external connecting portion 3 is used to connect the battery cell 120. The strip-shaped connecting portion 2 is connected to the body portion 1 and the external connecting portion 3. The strip-shaped connecting portion 2 includes a curved structure with at least one bending segment 21. The weak connecting portion 4 is located at the bending segment 21 of the strip-shaped connecting portion 2 and connects the strip-shaped connecting portion 2 to the body portion 1 or the strip-shaped connecting portion 2 and the external connecting portion 3.

[0077] In this embodiment, the strip-shaped connecting portion 2 is bent and positioned within the notch, and is arranged along the first direction with the external connecting portion 3. In its extended state, one end of the strip-shaped connecting portion 2 is connected to the main body portion 1, and the other end is connected to the external connecting portion 3. After the battery cell 120 expands, the weak connecting portion 4 can be destroyed by the expansion force of the battery cell 120. This allows the bent strip-shaped connecting portion 2 to transition to its extended state. The extension of the strip-shaped connecting portion 2 can counteract or absorb the expansion of the battery cell 120 and maintain the connection between the main body portion 1 and the external connecting portion 3, ensuring that the circuit board 10 continues to collect the current and / or voltage of the battery cell 120.

[0078] The bent section 21 of the strip-shaped connecting part 2 is fixed by the weak connecting part 4, which effectively improves the integrity and rigidity of the circuit board 10. Therefore, when the circuit board 10 is installed on the battery cell 120 and the external part 3 and the battery cell are connected by the adapter 30, the circuit board 10 is a whole, which is conducive to the operator to align, move and position, thereby improving the assembly efficiency of the battery device.

[0079] Furthermore, the connection between the external part 3 and the strip-shaped connecting part 2 via the destructible weak connecting part 4 can also prevent deformation of the external part 3 or the strip-shaped connecting part 2 when the adapter 30 is welded to the electrical component 20.

[0080] The strip-shaped connecting portion 2 is coiled within the notch to form at least one bent segment 21. The weak connecting portion 4 connects the strip-shaped connecting portion 2 coiled within the notch to the outer portion 3 or the strip-shaped connecting portion 2 to the body portion 1, thereby maintaining the strip-shaped connecting portion 2 in the coiled state within the notch. The coiling of the strip-shaped connecting portion 2 within the notch facilitates the accommodation of a longer strip-shaped connecting portion 2 to offset or absorb the expansion of the battery cell 120, thereby maintaining the connection between the body portion 1 and the outer portion 3, ensuring that the circuit board 10 continues to collect the current and / or voltage of the battery cell 120.

[0081] The strip-shaped connecting portion 2 includes multiple bent segments 21, and multiple weak connection portions 4 are provided, with at least one weak connection portion 4 provided at each bent segment 21. The strip-shaped connecting portion 2 is coiled within the notch in the form of multiple bent segments 21, which is advantageous for accommodating a longer strip-shaped connecting portion 2 to offset or absorb the expansion of the battery cell 120 to maintain the connection between the main body portion 1 and the external portion 3. Furthermore, the multiple bent segments 21 are all fixed by the weak connection portions 4, which is beneficial for effectively improving the integrity and rigidity of the circuit board 10, and can effectively prevent the strip-shaped adjusting portion 2 from accidentally detaching from the main body portion 1.

[0082] The strip-shaped connecting portion 2 includes a plurality of strip segments 22 connected sequentially along the length direction of the strip-shaped portion 2. The strip-shaped connecting portion 2 is coiled within the notch to form a plurality of parallel strip segments 22 arranged side by side along the width direction of the strip segments 22. A bending section 21 is formed between two adjacent strip segments 22 in the length direction of the strip-shaped connecting portion 2. The strip-shaped connecting portion 2 is arranged in an S-shape within the notch, which facilitates the smooth extension of the strip-shaped connecting portion 2 when the battery cell 120 expands, so as to offset or absorb the expansion of the battery cell 120 and thus maintain the connection between the main body portion 1 and the external connection portion 3.

[0083] The strip-shaped connecting portion 2 includes multiple bent segments 21, including a first bent segment 211 and a second bent segment 212. The bending directions of the first bent segment 211 and the second bent segment 212 are opposite. The first bent segment 211 and the second bent segment 212 are located at both ends of the length direction of the strip segment 22, respectively. The two ends of the strip-shaped connecting portion 2 along the length direction of the strip segment 22 are fixed by weak connecting portions 4, which helps to effectively improve the integrity and rigidity of the circuit board 10 and can effectively prevent the strip-shaped adjusting portion 2 from accidentally detaching from the main body portion 1.

[0084] The first bending segment 211 is adjacent to the outer connecting portion 3, and the second bending segment 212 is adjacent to the main body portion 2; that is, the first bending segment 211 is located at the end of the strip segment 22 near the outer connecting portion 3, and the second bending segment 212 is located at the end of the strip segment 22 near the main body portion 1. The weak connection portion 4 includes a first weak connection portion 41 and a second weak connection portion 42. The first weak connection portion 41 connects the first bending segment 211 and the outer connecting portion 3; the second weak connection portion 42 connects the second bending segment 212 and the main body portion 2. The first weak connection portion 41 and the second weak connection portion 42 fix the two ends of the strip-shaped connection portion 2 respectively, which helps to effectively improve the integrity and rigidity of the circuit board 10 and can effectively prevent the strip-shaped adjustment portion 2 from accidentally detaching from the main body portion 1.

[0085] In some embodiments, the strip-shaped connecting portion 2 coiled within the notch and the outer portion 3 are arranged along a first direction. The first bent segment 211 and the second bent segment 212 are connected by a strip-shaped segment 22 extending along the first direction. This facilitates the smooth extension of the strip-shaped connecting portion 2 when the battery cell 120 expands, so as to offset or absorb the expansion of the battery cell 120 and thus maintain the connection between the body portion 1 and the outer portion 3.

[0086] In some embodiments, the circuit board 10 further includes a weak connection structure 8 connecting the side of the external portion 3 away from the strip-shaped connecting portion 2 and the body portion 1. A second weak connection portion 42 connects the end of the strip-shaped connecting portion 2 coiled within the notch away from the external portion 3 and the body portion 1. The weak connection structure 8 connects the end of the external portion 3 away from the strip-shaped connecting portion 2 coiled within the notch and the body portion 1.

[0087] The first weak connection portion 41 and the weak connection structure 8 prevent the external connection portion 3 from lifting during welding of the adapter component 30 and the electrical component 20. Furthermore, the first weak connection portion 41 and the weak connection structure 8 can be promptly broken by the adapter component 30 when the battery cell 120 expands, to prevent the expansion of the battery cell from damaging the electrical connection lines.

[0088] In some embodiments, the length of the first weak connection portion 41 is 0.8-1.0 mm. The length of the weak connection structure 8 is 0.8-1.0 mm. Optionally, the length of the second weak connection portion 42 is 0.8-1.0 mm.

[0089] One end of the strip-shaped connecting part 2, which is coiled in the notch, is connected to the external part 3 via the first weak connecting part 41, and the other end is connected to the main body part 1 via the second weak connecting part 42. The end of the external part 3 away from the strip-shaped connecting part 2 is connected to the main body part 1 via the weak connecting structure 8. This effectively improves the integrity and rigidity of the circuit board 10. Therefore, when the circuit board 10 is installed on the battery cell 120 and the external part 3 and the battery cell are connected by the adapter 30, the circuit board 10 acts as a whole, which is conducive to the operator to align, move and position it, thereby improving the assembly efficiency of the battery device.

[0090] Combination Figures 7 to 9 As shown, after the battery cell 120 expands, the first weak connection 41, the second weak connection 42, and the weak connection structure 8 can all be destroyed under the expansion force of the battery cell 120. As a result, the strip-shaped connection 2 coiled in the notch can be transformed into an extended state. After the strip-shaped connection 2 is extended, one end is connected to the body part 1, and the other end is a free end. The external part 3 is connected to the free end of the strip-shaped connection 2. The extension of the strip-shaped connection 2 can offset or absorb the expansion deformation of the battery cell and maintain the connection between the external part 3 and the body part 1, so as to ensure that the circuit board 10 maintains the state of collecting the current and / or voltage of the battery cell 120.

[0091] Before the first weak connection 41, the second weak connection 42 and the weak connection structure 8 are damaged, one end of the connection of the first weak connection 41 and the strip connection 2 to the external part 3 is arranged in a second direction perpendicular to the first direction, and one end of the connection of the second weak connection 42 and the strip connection 2 to the body part 1 is arranged in the second direction. This effectively improves the integrity and rigidity of the circuit board 10. As a whole, the circuit board 10 is easy for operators to move and position, thereby improving the assembly efficiency of the battery device.

[0092] In some embodiments, the strip-shaped connecting portion 2 is wound back and forth in the notch along the first direction. The strip-shaped connecting portion 2 is wound in the notch in an S-shape, which helps to increase the length of the strip-shaped connecting portion 2 after it is extended, and improves the ability of the strip-shaped connecting portion 2 to offset or absorb the expansion of the battery cell, so as to ensure that the circuit board 10 maintains the state of collecting the current and / or voltage of the battery cell 120, thereby improving the ability of the circuit board 10 to resist the expansion of the battery cell.

[0093] In some embodiments, the strip-shaped connecting portion 2 includes a first strip segment 221, a second strip segment 222, and a third strip segment 223. The first strip segment 221 extends along a first direction, and the end of the first strip segment 221 away from the outer connecting portion 3 along the first direction is connected to the body portion 1. The second strip segment 222 extends along the first direction, and the end of the second strip segment 222 near the outer connecting portion 3 along the first direction is connected to the end of the first strip segment 221 near the outer connecting portion 3 along the first direction.

[0094] The third strip segment 223 extends along the first direction and is located on the side of the second strip segment 222 away from the first strip segment 221. The end of the third strip segment 223 away from the outer portion 3 along the first direction is connected to the end of the second strip segment 222 away from the outer portion 3 along the first direction. The end of the third strip segment 223 near the outer portion 3 along the first direction is connected to the outer portion 3.

[0095] Furthermore, the first strip segment 221 is located on the outermost side of the notch and is flush with the edge of the side of the main body 1, which improves the regularity of the circuit board 10 and facilitates its movement and positioning by the operator, thereby improving the assembly efficiency of the battery device. To further improve the regularity of the circuit board 10, the outer part 3 does not protrude from the edge of the side of the main body 1. Optionally, the end of the outer part 3 facing outward from the notch is flush with the side of the main body 1.

[0096] The first strip segment 221, the second strip segment 222, and the third strip segment 223 are arranged along a second direction perpendicular to the first direction, and are arranged sequentially from the inside to the outside within the aforementioned notch. The first strip segment 221, the second strip segment 222, and the third strip segment 223 are connected end to end to absorb or offset the expansion and deformation of the battery cell 120 after the aforementioned weak connection is damaged, so as to ensure that the circuit board 10 maintains the state of collecting the current and / or voltage of the battery cell 120.

[0097] In some embodiments, the first connecting portion connecting the first strip segment 221 and the second strip segment 222 is connected to the external portion 3 via a first weak connecting portion 41. The first weak connecting portion 41 connects the first strip segment 221 and the second strip segment 222 to the external portion 3, which helps improve the overall integrity and rigidity of the circuit board 10. The second connecting portion connecting the third strip segment 223 and the second strip segment 222 is connected to the body portion 1 via a second weak connecting portion 42. The second weak connecting portion 42 connects the third strip segment 223 and the second strip segment 222 to the body portion 1, which also helps improve the overall integrity and rigidity of the circuit board 10. This facilitates the operator's movement and positioning, thereby improving the assembly efficiency of the battery device.

[0098] In some embodiments, the body portion 1, the outer portion 3, and the strip-shaped connecting portion 2 are integrally formed. A slit 5 is provided on the circuit board 1 to distinguish the strip-shaped connecting portion 2, the body portion 1, and the outer portion 3. In this embodiment, the strip-shaped connecting portion 2 and the outer portion 3 of the circuit board 10 are formed by machining a slit on a single integral circuit board, which simplifies the processing procedure and improves production efficiency. For example, the aforementioned slit can be formed by pressing the integral circuit board with a mold.

[0099] A crack-stopping hole 6 is provided at the end of the crack 5. The crack-stopping hole 6 can effectively prevent the end of the crack 5 from continuing to tear due to stress concentration under the expansion force of the battery cell 120, so as to ensure the effective connection of the first strip segment 221 and the second strip segment 222.

[0100] In some embodiments, the weak connection portion 4 is formed by an interrupted crack 5. The strip-shaped connection portion 2, the external portion 3, and the weak connection portion 4 of the circuit board 10 can be formed by machining the crack on a single, integral circuit board, which simplifies the processing procedure and improves production efficiency. For example, the crack described above can be formed by pressing the integral circuit board with a mold.

[0101] In some embodiments, the strip-shaped connecting portion 2 is wound without gaps within the notch; the strip-shaped connecting portion 2 abuts against the body portion 1 without gaps; and the strip-shaped connecting portion 2 abuts against the outer portion 3 without gaps. The widths of the cracks 5 are all small, which allows for increasing the width of the strip-shaped connecting portion 2 within a limited size, thereby ensuring the reliability of the connection of the strip-shaped connecting portion 2 and also helping to ensure the size of the conductive components on the strip-shaped connecting portion 2.

[0102] Crack 5 includes a first crack 51, a second crack 52, and a third crack 53. The first crack 51 is located between the first strip segment 221 and the second strip segment 222 and serves to distinguish between them. The second crack 52 is located between the third strip segment 223 and the second strip segment 222 and serves to distinguish between them. The third crack 53 is located between the third strip segment 223 and the body portion 1 and serves to distinguish between the body portion 1 and the third strip segment 223.

[0103] The end of the first crack 51 near the outer connection portion 3 is spaced apart from the outer connection portion 3 in a first direction to form a first connecting portion connecting the first strip segment 221 and the second strip segment 222. The end of the second crack 52 away from the outer connection portion 3 is spaced apart from the second weak connecting portion 42 in a first direction to form a second connecting portion connecting the second strip segment 222 and the third strip segment 223.

[0104] In some embodiments, the anti-crack hole 6 includes a first anti-crack hole 65 and a second anti-crack hole 66. The first anti-crack hole 65 is disposed at one end of the first crack 51 near the first connection portion and is connected to the first crack 51. The first anti-crack hole 65 can effectively prevent the end of the first crack 51 from continuing to tear due to stress concentration under the expansion force of the battery cell 120, so as to ensure the effective connection of the first strip segment 221 and the second strip segment 222.

[0105] The second anti-crack hole 66 is provided at one end of the second connection near the second crack 52 and is connected to the second crack 52. The second anti-crack hole 66 can effectively prevent the end of the second crack 52 from continuing to tear due to stress concentration under the expansion force of the battery cell 120, so as to ensure the effective connection of the third strip segment 223 and the second strip segment 222.

[0106] In some embodiments, the circuit board further includes a first recessed portion 71 recessed from the outer edge inward, located between the first strip segment 221 and the outer portion 3 in a first direction. The second crack 52 includes a first crack segment 521 extending along the first direction and a second crack segment 522 connected to one end of the first crack segment 521 near the outer portion 3, the second crack segment 522 bending relative to the first crack segment 521 toward the first recessed portion 71. A first weak connection portion 41 is formed between the first recessed portion 71 and the end of the second crack segment 522 away from the first crack segment 521. The first weak connection portion 41 is formed by the second crack 52 and the first recessed portion 71 spaced apart. The first weak connection portion 41 and the first recessed portion 71 (notch) can be formed by machining cracks and notches on the entire circuit board, which helps simplify the processing procedure and improve production efficiency. For example, the aforementioned crack can be formed by pressing the entire circuit board with a mold.

[0107] In some embodiments, the anti-crack hole 6 further includes a third anti-crack hole 61 located at one end of the second crack segment 522 near the first weak connection portion 41. The third anti-crack hole 61 can effectively prevent the first weak connection portion 41 from continuing to tear in an unpredictable direction due to stress concentration after the first weak connection portion 41 breaks. This helps to ensure that the strip-shaped connection portion 2 can extend in a predetermined posture after the first weak connection portion 41 breaks, and that the extended strip-shaped connection portion 2 maintains an effective connection between the outer part 3 and the body part 1.

[0108] The end of the first recess 71 near the first weak connection 41 is rounded, which can effectively prevent the first weak connection 41 from breaking along a predetermined trajectory.

[0109] In some embodiments, the first crack 51 includes a third crack segment 511 extending in a first direction and a fourth crack segment 512 connected to one end of the third crack segment 511 away from the outer portion 3 and bent toward the third crack 53 relative to the third crack segment 511.

[0110] The third crack 53 includes a fifth crack segment 531 extending in a first direction and a sixth crack segment 532 connected to one end of the fifth crack segment 531 away from the outer portion 3 and bent toward the first crack 51 relative to the fifth crack segment 531.

[0111] The second connecting portion connecting the third strip segment 223 and the second strip segment 222 is connected to the body portion 1 through the second weak connecting portion 42, which is formed between the end of the sixth crack segment 532 away from the fifth crack segment 531 and the end of the fourth crack segment 512 away from the third crack segment 511.

[0112] The second weak connection portion 42 is formed by the first crack 51 and the third crack 53 spaced apart. The second weak connection portion 42 can be formed by machining cracks and gaps on the entire circuit board, which helps to simplify the processing procedure and improve production efficiency. For example, the cracks mentioned above can be formed by pressing the entire circuit board with a mold.

[0113] The crack arresting hole 6 also includes a fourth crack arresting hole 62 and a fifth crack arresting hole 63. The fourth crack arresting hole 62 is located at one end of the fourth crack segment 512 near the second weak connection portion 42 and is connected to the fourth crack segment 512. The fifth crack arresting hole 63 is located at one end of the sixth crack segment 532 near the second weak connection portion 42 and is connected to the sixth crack segment 532.

[0114] The fourth anti-crack hole 62 and the fifth anti-crack hole 63 can effectively prevent the second weak connection 42 from continuing to tear in an unpredictable direction due to stress concentration after the second weak connection 42 breaks. This helps to ensure that the strip connection 2 can extend in a predetermined posture after the second weak connection 42 breaks and that the extended strip connection 2 maintains an effective connection between the outer part 3 and the body part 1.

[0115] In some embodiments, the circuit board further includes a second recessed portion 72 recessed from the outer edge inward, and the second recessed portion 72 is located between the body portion 1 and the outer portion 3 in a first direction.

[0116] The third strip segment 223 and the outer part 3 are arranged along the first direction and located on the side of the third crack 53 away from the main body part 1. The third crack 53 also includes a seventh crack segment 533 located at one end of the fifth crack segment 531 adjacent to the outer part 3 and bent toward the second recess 72 relative to the fifth crack segment 531.

[0117] A weak connection structure 8 connecting the outer part 3 and the body part 1 is formed between the seventh crack segment 533 and the second recess 72.

[0118] The weak connection structure 8 is formed by the third crack 53 and the second recess 72 spaced apart. The weak connection structure 8 and the second recess 72 (notch) can be formed by machining cracks and notches on the entire circuit board, which helps to simplify the processing procedure and improve production efficiency. For example, the cracks mentioned above can be formed by pressing the entire circuit board with a mold.

[0119] In some embodiments, the anti-crack hole 6 further includes a sixth anti-crack hole 64 located at one end of the seventh crack segment 533 near the weak connection structure 8. The sixth anti-crack hole 64 can effectively prevent further tearing in an unpredictable direction due to stress concentration after the weak connection structure 8 breaks, which helps to ensure the integrity of the outer part 3. The end of the second recess 72 near the weak connection structure 8 is rounded, which can effectively prevent the weak connection structure 8 from breaking along a predetermined trajectory.

[0120] In some embodiments, the first strip segment 221 and the second strip segment 222 located on both sides of the first crack 51 abut against each other. The third strip segment 223 and the second strip segment 222 located on both sides of the second crack 52 abut against each other. The widths of the first crack 51, the second crack 52, and the third crack 53 are all relatively small. Within a limited size, the width of the strip-shaped connecting portion 2 can be increased to ensure the reliability of the connection of the strip-shaped connecting portion 2, and it is also beneficial to ensure the size of the conductive components on the strip-shaped connecting portion 2.

[0121] The circuit board of this utility model adopts a design structure to prevent battery cell expansion. Each sampling branch for connecting battery cells includes an S-shaped strip connection part 2 and an external part 3 connected to the strip connection part 2. The external part 3 is connected to the electrical component 20 (electrical connection piece for connecting battery cells, such as aluminum busbar) through an adapter 30 (metal adapter piece; for example, nickel sheet) to collect voltage or current signals.

[0122] The S-shaped structure on the sampling branch can adjust the extensible length according to different expansion displacement conditions. The connecting ribs (e.g., the first weak connection 41, the second weak connection 42, or the weak connection structure 8) are narrowed, with a rib width of 0.8-1.0mm. This is to prevent the nickel sheet from warping when connected to the aluminum busbar (e.g., by welding). The narrowing design also allows the adapter to break under tension, preventing the circuit from being pulled apart.

[0123] In this embodiment, the anti-expansion structure of the circuit board is set on the sampling branch, which can improve the branch's ability to absorb expansion and prevent the branch from breaking. The structure on the branch is S-shaped. Affected by the expansion of the battery cell, the S-shaped structure can be stretched or compressed to absorb the expansion displacement and avoid damage to the branch line.

[0124] The above are merely exemplary embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A battery device, characterized by, include: Multiple battery cells (120) arranged along the first direction; as well as A circuit board (10) extends along the first direction and is electrically connected to a plurality of battery cells (120) arranged along the first direction. The circuit board (10) includes a body part (1), a strip-shaped connecting part (2), an external part (3), and a weak connecting part (4). The body part (1) has a notch that extends through the thickness direction of the circuit board (10). The strip-shaped connecting part (2) and the external part (3) are arranged side by side in the notch along the first direction. The external part (3) is used to connect the battery cells (120). The strip-shaped connecting part (2) is connected to the body part (1) and the external part (3). The strip-shaped connecting part (2) includes a curved structure with at least one bending segment (21). The weak connecting part (4) is located at the bending segment (21) of the strip-shaped connecting part (2) and connects the strip-shaped connecting part (2) to the body part (1) or the strip-shaped connecting part (2) and the external part (3).

2. The battery device of claim 1, wherein The strip-shaped connecting portion (2) is coiled inside the notch to form at least one of the bent sections (21).

3. The battery device of claim 1, wherein The strip-shaped connecting part (2) includes multiple bending segments (21), and multiple weak connecting parts (4) are provided, with at least one weak connecting part (4) provided at each bending segment (21).

4. The battery device of claim 1, wherein The strip-shaped connecting part (2) includes a plurality of strip segments (22) connected sequentially along the length direction of the strip-shaped connecting part (2). The strip-shaped connecting part (2) is coiled in the notch so that the plurality of strip segments (22) are parallel and arranged side by side along the width direction of the strip segments (22). The bending section (21) is formed between two adjacent strip segments (22) in the length direction of the strip-shaped connecting part (2).

5. The battery device of claim 1, wherein The strip-shaped connecting part (2) includes a plurality of bent sections (21), the plurality of bent sections including a first bent section (211) and a second bent section (212), the bending directions of the first bent section (211) and the second bent section (212) are opposite.

6. The battery device of claim 5, wherein, The first bending segment (211) is adjacent to the outer part (3), and the second bending segment (212) is adjacent to the main body part (1); the weak connection part (4) includes: A first weak connection (41) connects the first bent segment (211) and the outer part (3); and / or, The second weak connection part (42) connects the second bending section (212) and the main body part (1).

7. The battery device of claim 5, wherein The strip-shaped connecting portion (2) coiled within the notch and the outer portion (3) are arranged along the first direction, and the first bent segment (211) and the second bent segment (212) are connected by a strip segment (22) extending along the first direction.

8. The battery device of claim 5, wherein, The strip-shaped connecting portion (2) includes: The first strip segment (221) extends along the first direction, with one end connected to the main body (1) and the other end connected to the first bent segment (211); The second strip segment (222) extends along the first direction, and one end of the second strip segment (222) near the outer portion (3) is connected to one end of the first strip segment (221) near the outer portion (3) via the first bending segment (211); and The third strip segment (223) extends along the first direction and is located on the side of the second strip segment away from the first strip segment (221). The end of the third strip segment (223) away from the outer part (3) is connected to the end of the second strip segment (222) away from the outer part (3) through the second bending segment (212). The end of the third strip segment (223) close to the outer part (3) is connected to the outer part (3).

9. The battery device of claim 1, wherein, The circuit board (10) is provided with a crack (5) for distinguishing the strip-shaped connecting part (2), the main body part (1) and the external part (3), and a crack-stopping hole (6) is provided at the end of the crack (5).

10. The battery device of claim 9, wherein, The crack includes: The first crack (51) is provided between the first strip segment (221) of the strip-shaped connecting part (2) and the second strip segment (222) that is parallel to the first strip segment (221); The second crack (52) is provided between the third strip segment (223) and the second strip segment (222) of the strip-shaped connecting part (2), which is parallel to the second strip segment (222) and located on the side of the second strip segment (222) away from the first strip segment (221); A third crack (53) is provided between the third strip segment (223) and the body part (1) and is used to distinguish the body part (1) and the third strip segment (223).

11. The battery device of claim 9, wherein, The weak connection (4) is formed by an interrupted crack (5).

12. The battery device according to claim 1, characterized in that, The strip-shaped connecting portion (2) is wound without gaps within the notch; and / or The strip-shaped connecting portion (2) abuts against the main body portion (1) without gap; and / or The strip-shaped connecting part (2) abuts against the outer part (3) without gap.

13. A circuit board, characterized by The circuit includes a main body (1), a strip-shaped connecting part (2), an external part (3), and a weak connection part (4). The main body (1) has a notch that extends through the thickness direction of the circuit board (10). The strip-shaped connecting part (2) and the external part (3) are arranged side by side in the notch along a first direction. The external part (3) is used to connect a battery cell (120). The strip-shaped connecting part (2) is connected to the main body (1) and the external part (3). The strip-shaped connecting part (2) includes a curved structure with at least one bending segment (21). The weak connection part (4) is located at the bending segment (21) of the strip-shaped connecting part (2) and connects the strip-shaped connecting part (2) to the main body (1) or the strip-shaped connecting part (2) and the external part (3).

14. The circuit board of claim 13, wherein, The strip-shaped connecting part (2) includes a plurality of strip segments (22) connected sequentially along the length direction of the strip-shaped connecting part (2). The strip-shaped connecting part (2) is coiled in the notch so that the plurality of strip segments (22) are parallel and arranged side by side along the width direction of the strip segments (22). The bending section (21) is formed between two adjacent strip segments (22) in the length direction of the strip-shaped connecting part (2).

15. The circuit board according to claim 13 or 14, characterized in that The strip-shaped connecting portion (2) includes multiple bent segments (21), the multiple bent segments including a first bent segment (211) and a second bent segment (212), the first bent segment (211) and the second bent segment (212) are respectively provided at both ends of the strip-shaped connecting portion (2) coiled in the notch along a first direction, and the weak connecting portion (4) includes: A first weak connection (41) connects the first bent segment (211) and the outer part (3); and / or, The second weak connection part (42) connects the second bending section (212) and the main body part (1).

16. The circuit board according to claim 13, characterized in that, The strip-shaped connecting portion (2) is wound without gaps within the notch; and / or The strip-shaped connecting portion (2) abuts against the main body portion (1) without gap; and / or The strip-shaped connecting part (2) abuts against the outer part (3) without gap.

17. An electrical device, characterized by Includes the battery device according to any one of claims 1 to 12.

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