Battery assembly and electronic device

Abstract

Some embodiments of the present disclosure provide a battery assembly and an electronic device, which can solve the problems of low space utilization, easy breakage when bending, uneven packaging and inconvenient integration of the battery assembly. The battery assembly comprises at least one cell group, a bus assembly, a packaging body and at least two electrode lead terminals. Each cell group comprises a plurality of cells arranged side by side, and adjacent two cells are spaced apart. The plurality of cells are connected in parallel. The bus assembly is located on one side of the cell group along a first direction, and the first direction is the thickness direction of the cell group. The bus assembly comprises a positive bus plate and a negative bus plate. The positive bus plate is connected with the positive electrodes of the plurality of cells, and the negative bus plate is connected with the negative electrodes of the plurality of cells. The packaging body covers the cell group and the bus assembly. The cell group and the bus assembly are located in the middle of the packaging body along the first direction. One end of the electrode lead terminal is connected with the bus assembly through the packaging body, and the other end is configured to be connected with an external circuit board.

Description

Technical Field

[0001] This disclosure relates to the field of smart wearable device technology, and more particularly to a battery component and electronic device. Background Technology

[0002] With the continuous development of portable electronic devices, their functional integration has been constantly improving, expanding from basic time display and activity monitoring to composite functions such as heart rate alerts, blood oxygen detection, GPS positioning, and offline payments. The increasing richness of functions in portable electronic devices places higher demands on battery capacity, battery life, and form factor adaptability. However, the contradiction between battery life and portability remains a core bottleneck restricting the development of portable electronic devices. Functional upgrades lead to a continuous increase in power consumption, but the size and weight of the watch itself limit the increase in built-in battery capacity. Summary of the Invention

[0003] The purpose of this disclosure is to provide a battery component and electronic device that can solve the problems of low space utilization, easy breakage when bent, uneven packaging, and inconvenient integration of battery components.

[0004] To achieve the above objectives, some embodiments of this disclosure provide the following technical solutions: On one hand, a battery assembly is provided, which includes at least one cell group, a busbar assembly, an encapsulation body, and at least two electrode lead-out terminals. At least one battery cell assembly, each battery cell assembly comprising a plurality of battery cells arranged side-by-side, with adjacent battery cells spaced apart, and the plurality of battery cells connected in parallel; a busbar assembly located on one side of the battery cell assembly along a first direction, the first direction being the thickness direction of the battery cell assembly, the busbar assembly comprising a positive busbar and a negative busbar, the positive busbar being connected to the positive electrode of the plurality of battery cells, and the negative busbar being connected to the negative electrode of the plurality of battery cells; a package covering the battery cell assembly and the busbar assembly, the battery cell assembly and the busbar assembly being located in the middle of the package along the first direction; at least two electrode leads, one end of each electrode lead passing through the package and connected to the busbar assembly, the other end being configured to connect to an external circuit board; the at least two electrode leads comprising a positive lead and a negative lead, the positive lead being connected to the positive busbar, and the negative lead being connected to the negative busbar.

[0005] In the battery module provided in this disclosure, the cell assembly and the busbar assembly are located in the middle of the package along the first direction. This ensures that the tensile or compressive stress borne by the cell assembly and the busbar assembly is minimized during bending, reducing the deformation of the cell assembly and the busbar assembly, thereby improving the bending life of the battery module. Furthermore, the end of the electrode lead terminal connected to the external circuit board is located outside the package, while the cell assembly is located inside the package. In other words, the circuitry and the battery module are designed separately to improve the total capacity of the battery module and space utilization.

[0006] In some embodiments, the positive electrode busbar includes a plurality of first recesses spaced apart, and the negative electrode busbar includes a plurality of second recesses spaced apart, wherein one first recess and one second recess are correspondingly disposed; and one battery cell is correspondingly disposed within one first recess and one second recess.

[0007] By incorporating the first and second recesses, the battery cells can be tightly embedded in the busbar assembly, allowing for more cells to be accommodated within the same volume or reducing the overall size. Furthermore, the material thickness at the cell connection points of the busbar assembly can be reduced, facilitating stress relief and preventing breakage. This ultimately improves the battery assembly's lifespan and reliability. In some embodiments, the positive busbar includes a first connecting portion connected between two adjacent first recesses, and the negative busbar includes a second connecting portion connected between two adjacent second recesses; along a direction perpendicular to the first direction and perpendicular to the arrangement direction of the plurality of cells, the size of the first connecting portion is reduced relative to the size of the first recess, and / or the size of the second connecting portion is reduced relative to the size of the second recess.

[0008] The aforementioned dimensional settings enable the busbar assembly to be more flexible as a whole. When the battery assembly is bent, the busbar assembly can deform accordingly, reducing stress concentration at the first or second connection, reducing the risk of breakage, and extending the bending life of the battery assembly.

[0009] In some embodiments, the battery assembly includes two cell groups stacked along the first direction, wherein two cells located at the same position in the two cell groups have orthographic projections that at least partially overlap on the busbar assembly.

[0010] Two cells located at the same position in two cell groups have at least partial overlap in their orthographic projection on the busbar assembly, which enables the cells to be stacked in multiple layers in the thickness direction instead of being laid out in a plane, thereby increasing the number of cells per unit volume and thus increasing the total capacity of the battery assembly.

[0011] In some embodiments, along the first direction, the package includes a first surface and a second surface opposite to each other, and the distance between the battery cell assembly and the first surface is equal to the distance between the battery cell assembly and the second surface.

[0012] With the above configuration, during the bending process of the battery module, the battery cell and the busbar are essentially in the neutral layer of the package, and the tensile or compressive stress they are subjected to is minimized. This can reduce the risk of breakage and fatigue failure, and improve the service life and reliability of the battery module.

[0013] In some embodiments, the package further includes a first buffer layer and a second buffer layer, the first buffer layer and the second buffer layer being located within the package; along the first direction, the cell assembly includes opposing third and fourth surfaces, the side of the cell closer to the busbar is the third surface, the first buffer layer is disposed on the third surface, and the second buffer layer is disposed on the fourth surface of the cell assembly.

[0014] The first and second buffer layers can absorb bending stress, thus protecting the battery cells and busbar components.

[0015] In some embodiments, the assembly further includes: a plurality of support structures disposed between the third surface of the battery cell assembly and the first buffer layer, wherein the orthographic projection of one battery cell in the busbar assembly at least partially overlaps with the orthographic projection of one support structure in the busbar assembly.

[0016] The support structure provides rigid support for the battery cell, preventing excessive deformation when the cell is bent.

[0017] In some embodiments, the positive lead terminal and the negative lead terminal are disposed on the same side of the busbar assembly, and the length of the portion of the positive lead terminal and the negative lead terminal exposed in the package is 3mm to 8mm.

[0018] The lengths of the positive and negative leads exposed in the package are set to facilitate electrical connection to an external circuit board.

[0019] On the other hand, an electronic device is provided, comprising: a main body and a battery assembly as described in any of the above embodiments, the battery assembly being detachably electrically connected to the main body.

[0020] The beneficial effects that the electronic device provided in this embodiment can achieve are the same as those that the battery assembly provided in the above embodiments can achieve, and will not be repeated here.

[0021] In some embodiments, the main unit includes a circuit board and a battery protection circuit integrated on the circuit board; the battery protection circuit is electrically connected to the battery assembly through electrode lead-out terminals and is used to monitor and control the charging and discharging state of the battery assembly.

[0022] The above configuration separates the battery protection circuit from the battery assembly, making the battery assembly thinner and lighter, and allowing users to easily replace the battery assembly without disassembling the main unit. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are only drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings. In addition, the drawings described below can be regarded as schematic diagrams and are not intended to limit the actual size of the product, the actual flow of the method, the actual timing of the signals, etc. involved in the embodiments of this disclosure.

[0024] Figure 1 A structural diagram of an electronic device provided in an embodiment of this disclosure; Figure 2 A cross-sectional structural diagram of a busbar assembly provided in an embodiment of this disclosure; Figure 3 A cross-sectional structural diagram of a busbar assembly and a battery cell provided in an embodiment of this disclosure; Figure 4 A planar structural diagram of a busbar assembly provided in an embodiment of this disclosure; Figure 5 Another cross-sectional structural diagram of the busbar assembly and battery cell provided in the embodiments of this disclosure; Figure 6 A cross-sectional structural diagram of the package and the battery cell provided in the embodiments of this disclosure; Figure 7 A cross-sectional structural diagram of a busbar assembly, battery cell, and first buffer layer provided in an embodiment of this disclosure; Figure 8 A cross-sectional structural diagram of a busbar assembly, a battery cell, a first buffer layer, and a second buffer layer provided in an embodiment of this disclosure; Figure 9 A cross-sectional structural diagram of the busbar assembly, battery cell, and support structure provided in this embodiment of the disclosure; Figure 10 An equivalent circuit structure diagram is provided for an embodiment of this disclosure. Detailed Implementation

[0025] The technical solutions in some embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments provided in this disclosure are within the scope of protection of this disclosure.

[0026] Unless the context otherwise requires, throughout the specification and claims, the term "comprising" is interpreted as open-ended and encompassing, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "example," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this disclosure. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0027] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0028] In describing some embodiments, the terms "coupled" and "connected," and their derivative expressions, may be used. The term "connected" should be interpreted broadly; for example, a "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection via an intermediate medium. The term "coupled," for example, indicates that two or more components have direct physical or electrical contact. The term "coupled" or "communicatively coupled" may also refer to two or more components that do not have direct contact with each other but still cooperate or interact with each other. The embodiments disclosed herein are not necessarily limited to the content of this document.

[0029] "At least one of A, B and C" has the same meaning as "at least one of A, B or C", both including the following combinations of A, B and C: only A, only B, only C, combinations of A and B, combinations of A and C, combinations of B and C, and combinations of A, B and C.

[0030] "A and / or B" includes the following three combinations: A only, B only, and a combination of A and B.

[0031] As used herein, depending on the context, the term "if" may optionally be interpreted as meaning "when," "at," "in response to determination," or "in response to detection." Similarly, depending on the context, the phrase "if it is determined..." or "if [the stated condition or event] is optionally interpreted as meaning "when it is determined..." or "in response to determination..." or "when [the stated condition or event] is detected" or "in response to the detection of [the stated condition or event]."

[0032] The use of “applies to” or “configured to” in this article implies an open and inclusive language that does not preclude applicability to or configuration to devices that perform additional tasks or steps.

[0033] In addition, the use of “based on” implies openness and inclusivity, because processes, steps, calculations or other actions “based on” one or more of the stated conditions or values ​​may in practice be based on additional conditions or values ​​beyond those stated.

[0034] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0035] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable deviation range, which is determined by those skilled in the art taking into account the measurement under discussion and the errors associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable deviation range for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable deviation range for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable deviation range for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0036] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0037] This document describes exemplary embodiments with reference to cross-sectional views and / or plan views, which are idealized exemplary drawings. In the drawings, the thickness of layers and the area of ​​regions are enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched areas shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the areas of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0038] For ease of description below, an XYZ coordinate system is established. The first direction X is perpendicular to the cell assembly, i.e., the thickness direction in this application. The YZ plane is perpendicular to the X direction, and the second direction Y intersects the third direction Z. For example, the second direction Y and the third direction Z are perpendicular to each other.

[0039] It should be noted that the reference numerals A / B to C appearing in the accompanying drawings of this disclosure indicate that A and B can both refer to the structure indicated by the reference numerals, and that A / B both belong to C. Similar reference numerals appearing in the accompanying drawings also follow the above explanation.

[0040] like Figures 2-9 As shown, and in combination Figure 1 Some embodiments of this disclosure provide a battery assembly 10, which includes at least one cell group 1, a busbar assembly 2, an encapsulation body 3, and at least two electrode lead-out terminals 4. Each cell assembly 1 includes multiple cells 11 arranged side by side, with adjacent cells 11 spaced apart, and the multiple cells 11 connected in parallel. A busbar assembly 2 is located on one side of the cell assembly 1 along a first direction Z, where the first direction Z is the thickness direction of the cell assembly 1. The busbar assembly 2 includes a positive busbar 21 and a negative busbar 22. The positive busbar 21 is connected to the positive electrode of the multiple cells 11, and the negative busbar 22 is connected to the negative electrode of the multiple cells 11. A package 3 covers the cell assembly 1 and the busbar assembly 2, and the cell assembly 1 and the busbar assembly 2 are located in the middle of the package 3 along the first direction Z. One end of the electrode lead terminal 4 passes through the package 3 and is connected to the busbar assembly 2, and the other end is configured to connect to an external circuit board 81. At least two electrode lead terminals 4 include a positive lead terminal 41 and a negative lead terminal 42. The positive lead terminal 41 is connected to the positive busbar 21, and the negative lead terminal 42 is connected to the negative busbar 22.

[0041] For example, each cell group 1 includes multiple cells 11 arranged side by side. For instance, the multiple cells 11 arranged side by side have the same capacity and occupy the same space. Adjacent cells 11 are spaced apart, for example, with an insulating material between them to prevent short circuits and to allow space for thermal expansion. Furthermore, the parallel connection of multiple cells 11 increases the total capacity of the battery assembly 10.

[0042] For example, the busbar assembly 2 is located on one side of the battery cell assembly 1 along the first direction Z, which is the thickness direction of the battery cell assembly 1 and also the thickness direction of the battery cell 1.

[0043] For example, the positive electrode busbar 21 is connected to the positive electrode of the plurality of battery cells 11, and the negative electrode busbar 22 is connected to the negative electrode of the plurality of battery cells 11. The connection method here is electrical connection, which can be welding connection.

[0044] For example, the encapsulation body 3 covers the battery cell assembly 1 and the busbar assembly 2, which can isolate external moisture and protect the battery cell 11.

[0045] In the battery assembly 10 provided in this disclosure, the cell assembly 1 and the busbar assembly 2 are located in the middle of the package 3 along the first direction Z. This ensures that the tensile or compressive stress borne by the cell assembly 1 and the busbar assembly 2 is minimized during bending, reducing the deformation of the cell assembly 1 and the busbar assembly 2, thereby improving the bending life of the battery assembly 10. In addition, one end of the electrode lead terminal 4 connected to the external circuit board 81 is located outside the package 3, while the cell assembly 1 is located inside the package 3. That is to say, the circuit and the battery assembly 10 adopt a separate design to improve the total capacity of the battery assembly 10 and the space utilization rate.

[0046] In some embodiments, such as Figure 2 and Figure 3 As shown, the positive electrode busbar 21 includes a plurality of first recesses 211 spaced apart, and the negative electrode busbar 22 includes a plurality of second recesses 221 spaced apart, wherein one first recess 211 and one second recess 221 are correspondingly arranged; and one battery cell 11 is correspondingly arranged in one first recess 211 and one second recess 221.

[0047] For example, the positive electrode busbar 21 includes a plurality of first recesses 211 spaced apart, and the negative electrode busbar 22 includes a plurality of second recesses 221 spaced apart. Each first recess 211 and each second recess 221 is correspondingly arranged to form a receiving space. A battery cell 11 is correspondingly disposed within each first recess 211 and each second recess 221. That is, by providing the first recesses 211 and the second recesses 221, the battery cell 11 can be tightly embedded in the busbar assembly 2, thereby accommodating more battery cells 11 within the same volume or reducing the overall volume. Furthermore, the sidewalls of the first recesses 211 and the second recesses 221 can restrict the displacement of the battery cell 11 in the arrangement direction. The arrangement of the first recesses 211 and the second recesses 221 allows the material thickness of the busbar assembly 2 at the connection point of the battery cell 11 to be thinner, which is beneficial for stress release and prevents the busbar assembly 2 from breaking, thereby improving the service life and reliability of the battery assembly 10.

[0048] In some embodiments, such as Figure 3 and combined Figure 4 As shown, the positive electrode busbar 21 includes a first connecting portion 212, which is connected between two adjacent first recesses 211. The negative electrode busbar 22 includes a second connecting portion 222, which is connected between two adjacent second recesses 221. Along a direction perpendicular to the first direction Z and perpendicular to the arrangement direction of the plurality of cells 11, for example, the second direction X is the arrangement direction of the plurality of cells 11, and the direction perpendicular to the first direction Z and perpendicular to the arrangement direction of the plurality of cells 11 is the third direction Y, the size of the first connecting portion 212 is smaller than the size of the first recess 211, and / or the size of the second connecting portion 222 is smaller than the size of the second recess 221.

[0049] For example, by setting the size of the first connecting portion 212 to be smaller than the size of the first recess 211, and / or setting the size of the second connecting portion 222 to be smaller than the size of the second recess 221, the area of ​​the busbar assembly 2 between the cells 11 can be narrowed, and the busbar assembly 2 as a whole can be made more flexible. When the battery assembly 10 is bent, the busbar assembly 2 can deform accordingly, reducing the stress concentration of the first connecting portion 212 or the second connecting portion 222, reducing the risk of breakage, and extending the bending life of the battery assembly 10.

[0050] In some embodiments, such as Figure 3 and combined Figure 4 As shown, the size of the first recess 211 in the second direction X is larger than the size of the first connecting portion 212 in the second direction X, and the size of the second recess 221 in the second direction X is larger than the size of the second connecting portion 222 in the second direction X. The second direction X is the arrangement direction of the plurality of cells 11.

[0051] For example, the above-mentioned size setting can ensure that the cell 11 has enough space to be embedded in the first recess 211 and the second recess 221, thus ensuring the capacity of the cell 11. At the same time, when the battery assembly 10 is bent, the stress concentration of the first connection 212 or the second connection 222 is reduced, the risk of breakage is reduced, and the bending life of the battery assembly 10 is extended.

[0052] In some embodiments, such as Figure 5 As shown, the battery assembly 10 includes two cell groups 1, which are stacked along the first direction Z. The two cells 11 located at the same position in the two cell groups 1 have at least partially overlapping orthogonal projections on the busbar assembly 2.

[0053] For example, the orthographic projections of two cells 11 located at the same position in two cell groups 1 may partially overlap or completely overlap on the busbar assembly 2. That is, among the two cells 11 located at the same position in two cell groups 1, the orthographic projection of one cell 11 on the busbar assembly 2 lies within the orthographic projection of the other cell 11 on the busbar assembly 2, or the two cells 11 located at the same position in two cell groups 1 have the same area.

[0054] For example, the provision of the first recess 211 and the second recess 221 enables the cells 11 to be stacked in multiple layers in the thickness direction, rather than being laid out in a plane, thereby increasing the number of cells 11 per unit volume and increasing the total capacity of the battery assembly 10.

[0055] In some embodiments, such as Figure 6 As shown, along the first direction Z, the package 3 includes a first surface 31 and a second surface 32, and the distance between the battery cell assembly 1 and the first surface 31 is equal to the distance between the battery cell assembly 1 and the second surface 32.

[0056] It is understandable that the above configuration means that the cell assembly 1 is located in the middle of the package 3. Since the cell 11 in the cell assembly 1 is located in the first recess 211 and the second recess 221 of the busbar assembly 2, that is, the center of the cell 11 is on the same straight line as the center of the first recess 211 and the second recess 221. During the bending process of the battery assembly 10, the cell 11 and the busbar assembly 2 are equivalent to being in the neutral layer of the package 3, and the tensile or compressive stress they are subjected to is minimal. This can reduce the risk of breakage and fatigue failure, and improve the service life and reliability of the battery assembly 10.

[0057] In some embodiments, such as Figure 7 and Figure 8As shown, it also includes a first buffer layer 61 and a second buffer layer 62, which are located inside the package 3; along the first direction Z, the battery cell assembly 1 includes a third surface 13 and a fourth surface 14 opposite to each other, the side of the battery cell 11 closest to the busbar assembly 2 is the third surface 13, the first buffer layer 61 is disposed on the third surface 13, and the second buffer layer 62 is disposed on the fourth surface 14 of the battery cell assembly 1.

[0058] For example, the first buffer layer 61 and the second buffer layer 62 can absorb bending stress and protect the battery cell 11 and the bus assembly 2.

[0059] For example, the thickness of the first buffer layer 61 and the second buffer layer 62 is 0.05 mm to 0.2 mm, and the material of the first buffer layer 61 and the second buffer layer 62 is, for example, a polyimide film.

[0060] In some embodiments, such as Figure 9 As shown, and in combination Figure 8 It also includes: multiple support structures 7, which are disposed between the third surface 13 of the cell assembly 1 and the first buffer layer 61, and the orthographic projection of a cell 11 on the busbar assembly 2 at least partially overlaps with the orthographic projection of a support structure 7 on the busbar assembly 2.

[0061] For example, the thickness of the support structure 7 is, for instance, 0.05 mm to 2 mm, and the material is nickel sheet with a density of 0.2 g / cm³. 3 .

[0062] It should be noted that the support structure 7 provides rigid support for the battery cell 11, preventing the battery cell 11 from deforming excessively when bent.

[0063] In some embodiments, such as Figure 3 , Figure 6 As shown, and in combination Figure 1 The positive terminal 41 and the negative terminal 42 are located on the same side of the bus assembly 2, and the length of the portion of the positive terminal 41 and the negative terminal 42 exposed in the package 3 is 3mm to 8mm.

[0064] For example, the lengths of the portions of the positive lead terminal 41 and the negative lead terminal 42 exposed in the package 3 can be, for example, 3 mm, 5 mm, or 8 mm, to facilitate electrical connection to the external circuit board 81. The surfaces of the positive lead terminal 41 and the negative lead terminal 42 are plated with a protective material, such as gold.

[0065] like Figure 1As shown, some embodiments of this disclosure also provide an electronic device 100, which includes a main body 8 and a battery assembly 10 as described in any of the above embodiments, wherein the battery assembly 10 is detachably electrically connected to the main body 8. Therefore, the beneficial effects that the electronic device 100 provided in the embodiments of this disclosure can achieve are the same as the beneficial effects that the battery assembly 10 provided in the above embodiments can achieve, and will not be repeated here.

[0066] For example, the battery assembly 10 and the main unit 8 are connected via a magnetic interface or, as shown in the example, by means of a magnetic interface. Figure 1 The spring pin interface 9 shown is used for detachable electrical connection.

[0067] In some embodiments, such as Figure 1 As shown, and in combination Figure 3 , Figure 10 The main body 8 includes a circuit board 81 and a battery protection circuit 82 integrated on the circuit board 81. The battery protection circuit 82 is electrically connected to the battery assembly 10 through electrode lead-out terminals 4 and is used to monitor and control the charging and discharging state of the battery assembly 10.

[0068] For example, the battery protection circuit 82 includes a plurality of switch sub-circuits 820 disposed between the positive terminal 41 and the battery protection circuit 82, for controlling the connection and disconnection between the circuit board 81 and the battery assembly 10.

[0069] It should be noted that the battery protection circuit 82 is integrated into the circuit board 81 and is connected separately from the battery assembly 10. This reduces the space occupied by the battery cells 11 in the battery assembly 10, thereby increasing the total capacity. At the same time, separating the battery protection circuit 82 from the battery assembly 10 makes the battery assembly 10 thinner and lighter, and allows users to easily replace the battery assembly 10 without disassembling the main unit 8.

[0070] It should also be noted that the switch sub-circuit 820 is used to disconnect the battery assembly 10 from the circuit board 81 in abnormal conditions, thereby achieving overcharge, over-damage, and overcurrent protection.

[0071] For example, the circuit board 81 also integrates an equalization circuit, each of which includes an equalization chip. For instance, each battery cell group 1 corresponds to one equalization circuit. When the voltage difference of the battery cells 11 is greater than or equal to 50mV, the equalization circuit operates to ensure the charging consistency of the parallel battery cells 11.

[0072] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery assembly, characterized in that, include: At least one battery cell group, each battery cell group comprising a plurality of battery cells arranged side by side, with adjacent two battery cells spaced apart, and the plurality of battery cells connected in parallel; A current-collecting assembly is located on one side of the battery cell assembly along a first direction, the first direction being the thickness direction of the battery cell assembly. The current-collecting assembly includes a positive current-collecting plate and a negative current-collecting plate. The positive current-collecting plate is connected to the positive electrode of the plurality of battery cells, and the negative current-collecting plate is connected to the negative electrode of the plurality of battery cells. A package that encapsulates the battery cell assembly and the current bus assembly, wherein the battery cell assembly and the current bus assembly are located at the center of the package along the first direction; The device has at least two electrode leads, one end of which passes through the package and is connected to the bus assembly, and the other end is configured to connect to an external circuit board. The at least two electrode leads include a positive lead and a negative lead, the positive lead being connected to the positive busbar and the negative lead being connected to the negative busbar.

2. The battery assembly according to claim 1, characterized in that, The positive electrode busbar includes a plurality of first recesses spaced apart, and the negative electrode busbar includes a plurality of second recesses spaced apart, wherein one first recess and one second recess are correspondingly disposed; and one battery cell is correspondingly disposed within one first recess and one second recess.

3. The battery assembly according to claim 1, characterized in that, The positive electrode busbar includes a first connecting portion, which is connected between two adjacent first recesses; the negative electrode busbar includes a second connecting portion, which is connected between two adjacent second recesses. Along a direction perpendicular to the first direction and perpendicular to the arrangement direction of the plurality of cells, the size of the first connecting portion is reduced inward relative to the size of the first recessed portion, and / or the size of the second connecting portion is reduced inward relative to the size of the second recessed portion.

4. The battery assembly according to claim 1, characterized in that, The battery assembly includes two cell groups stacked along the first direction, wherein two cells located at the same position in the two cell groups have at least partially overlapping orthogonal projections on the busbar assembly.

5. The battery assembly according to claim 1, characterized in that, Along the first direction, the package includes a first surface and a second surface opposite each other, and the distance between the battery cell assembly and the first surface is equal to the distance between the battery cell assembly and the second surface.

6. The battery assembly according to claim 1, characterized in that, It also includes a first buffer layer and a second buffer layer, which are located within the package body; Along the first direction, the cell assembly includes a third surface and a fourth surface opposite each other, the side of the cell closer to the busbar is the third surface, the first buffer layer is disposed on the third surface, and the second buffer layer is disposed on the fourth surface of the cell assembly.

7. The battery assembly according to claim 6, characterized in that, Also includes: Multiple support structures are disposed between the third surface of the battery cell assembly and the first buffer layer, and the orthographic projection of one battery cell in the busbar assembly at least partially overlaps with the orthographic projection of one support structure in the busbar assembly.

8. The battery assembly according to claim 1, characterized in that, The positive lead terminal and the negative lead terminal are located on the same side of the busbar assembly, and the length of the portion of the positive lead terminal and the negative lead terminal exposed in the package is 3mm to 8mm.

9. An electronic device, characterized in that, include: The main unit and the battery assembly as described in claim 1, wherein the battery assembly is detachably electrically connected to the main unit.

10. The electronic device according to claim 9, characterized in that, The main unit includes a circuit board and a battery protection circuit integrated on the circuit board; The battery protection circuit is electrically connected to the battery assembly through the electrode lead-out terminals, and is used to monitor and control the charging and discharging state of the battery assembly.

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