Battery pack and electronic device

Abstract

The utility model discloses a battery pack and electronic equipment, a battery is provided with at least two battery cell groups, each battery cell group is electrically connected with a protection plate, the two protection plates are electrically connected through a circuit board, and a flexible circuit board can be bent, so that the two battery cell groups can move relatively; furthermore, the protective film covers the connecting part of the protective plate and the battery cell, so that insulation protection on the protective plate and the connecting part is formed, and the connection stability between the protective plate and the connecting part is ensured; the protection plate and the connection part are prevented from being influenced by static electricity in the electronic equipment and current of electronic devices, so that the power supply stability of the battery pack is ensured, and the service life of the battery pack can be prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack and electronic equipment. Background Art

[0002] In some existing electronic devices, the battery compartment for placing the battery pack has an arc shape, but the traditional battery pack cannot be bent and cannot adapt to the use environment that requires the battery pack to be bent. In addition, the connection between the tabs and the protection board of the battery cells in the existing battery pack lacks insulation protection. When the battery pack is used in an electronic device, the connection between the tabs and the protection board, as well as the tabs and the protection board themselves, are easily affected by the current of other electrical components in the electronic device, resulting in poor stability of current transmission between the tabs and the protection board, which in turn reduces the power supply efficiency of the battery pack to the electronic device. Utility Model Content

[0003] The utility model aims to provide a battery pack and an electronic device to solve the problem that the current battery pack cannot be bent, resulting in an inability to adapt to a usage environment that requires the battery pack to be bent and a reduced power supply efficiency.

[0004] According to a first aspect of an embodiment of the present application, there is provided a battery pack, comprising: two groups of battery cell groups, the battery cell groups having a length direction and a thickness direction, each group of the battery cell groups comprising at least one battery cell, the battery cell comprising a main body and a connecting portion, the connecting portion protrudingly arranged on an end surface of one end of the main body in the length direction, and the connecting portion extending along the length direction; two protective plates, the battery cells in one group of the battery cell groups are electrically connected to one of the protective plates through the connecting portion, and the battery cells in the other group of the battery cell groups are electrically connected to the other protective plate through the connecting portion; a circuit board, the circuit board comprising a first end and a second end arranged opposite to each other, the first end being electrically connected to one of the two protective plates, and the second end being electrically connected to the other of the at least two protective plates, and the circuit board being bendable to enable relative movement between the two groups of battery cell groups; a protective film, the protective film covering the protective plate and the connecting portion, the protective film comprising a first section and a second section arranged along the length direction, the orthographic projection of the protective plate in the thickness direction falling within the first section, and the orthographic projection of the connecting portion in the thickness direction falling within the second section.

[0005] Optionally, the number of battery cells in each group of the battery cell groups is at least two, and at least two of the battery cells are electrically connected to the protection board respectively; at least two of the battery cells in each group of the battery cell groups are connected in series and / or in parallel through the protection board; the battery cells in the at least two groups of battery cell groups are connected in series and / or in parallel through the circuit board.

[0006] Optionally, the battery cell has a thickness direction, and the at least two battery cell groups can be stacked along the thickness direction by bending the circuit board.

[0007] Optionally, two groups of battery cell groups stacked along the thickness direction are bonded and fixed.

[0008] Optionally, the battery pack further includes a protective film, and the protective plate includes two surfaces arranged opposite to each other along a thickness direction; the protective film is arranged on at least one of the two surfaces.

[0009] Optionally, the circuit board includes two wall surfaces that are arranged opposite to each other along the thickness direction thereof; and a heat dissipation layer is provided on at least one of the two wall surfaces.

[0010] Optionally, the heat dissipation layer is a boron nitride coating or a graphene coating.

[0011] Optionally, the battery pack further includes a connector, the connector including a first connecting end and a second connecting end arranged opposite to each other along its length direction, the first connecting end is electrically connected to one of the protection plates, and the second connecting end can be electrically connected to an electrical device.

[0012] Optionally, the battery cell group has a length direction and a width direction, the battery cell group has a first side end and a second side end arranged opposite to each other along the length direction, the battery cell group is electrically connected to the protection plate through the first side end, and the protection plate extends along the width direction.

[0013] A second aspect of the embodiments of the present application provides an electronic device, comprising the battery pack as described above.

[0014] In summary, the embodiments of the present application provide a battery pack and an electronic device having the battery pack, wherein the battery is provided with at least two groups of battery cell groups, each group of battery cell groups is electrically connected to a protection board, and the two protection boards are electrically connected through a circuit board. The flexible circuit board can be bent so that the two groups of battery cell groups can move relative to each other, thereby making the battery pack suitable for use in an environment that requires bending, and a protective film is covered on the connecting portion between the protection board and the battery cell to form insulating protection for the protection board and the connecting portion, thereby ensuring the connection stability between the protection board and the connecting portion, and preventing the protection board and the connecting portion from being affected by static electricity inside the electronic device and the current of the electronic device, thereby ensuring the power supply stability of the battery pack and improving the service life of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 is a schematic diagram of the structure of a battery pack provided in an embodiment of the present application;

[0017] Figure 2 yes Figure 1 A top view of

[0018] Figure 3 yes Figure 1 Exploded diagram of

[0019] Figure 4 is a schematic diagram of the structure of a battery cell in a battery pack provided in an embodiment of the present application;

[0020] Figure 5 It is a structural schematic diagram of a protective plate mounted in a battery pack provided in an embodiment of the present application;

[0021] Figure 6 is a schematic diagram of the structure of a circuit board in a battery pack provided in an embodiment of the present application;

[0022] Figure 7 It is a schematic diagram of the structure of the protective film in the battery pack provided in the embodiment of the present application.

[0023] Description of main reference numerals:

[0024] 1. Battery pack, 10. Cell group, 10a. First side end, 10b. Second side end, 101. First cell group, 102. Second cell group, 11. Cell, 111. Main body, 112. Connecting part, 20. Protective plate, 201. First protective plate, 202. Second protective plate, 21. Surface, 30. Circuit board, 31. First end, 32. Second end, 33. Wall, 40. Protective film, 41. First section, 42. Second section, 50. Connector, 51. First connecting end, 52. Second connecting end;

[0025] X, length direction, Y, width direction, Z, thickness direction. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and beneficial effects of this application more clear, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

[0027] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" refers to two or more, unless otherwise clearly and specifically defined.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0030] An embodiment of the present application provides an electronic device, including a battery pack.

[0031] In some embodiments, a battery pack 1 is provided, referring to Figure 1 to Figure 7 The battery pack 1 includes: a battery cell group 10, a protection board 20, a circuit board 30 and a protection film 40.

[0032] In some embodiments, the battery cell groups 10 have a length direction X, a width direction Y, and a thickness direction Z that are orthogonal to each other. The number of battery cell groups 10 is two, and each battery cell group 10 includes at least one battery cell 11. Figure 1 to Figure 4 In the illustrated embodiment, the battery cell group 10 in the battery pack 1 includes a first battery cell group 101 and a second battery cell group 102, the first battery cell group 101 and the second battery cell group 102 are arranged at intervals along the length direction X, each battery cell group 10 includes three battery cells 11, and the three battery cells 11 are arranged in sequence along the width direction Y to form the battery cell group 10. In other implementations of the present application, the number of battery cells 11 in each battery cell group 10 can be adjusted according to actual usage requirements.

[0033] In some embodiments, reference Figure 1 to Figure 4 The battery cell 11 includes a main body 111 and a connecting portion 112 . The connecting portion 112 is protrudingly arranged on an end surface of the main body 111 at one end in the length direction X. The connecting portion 112 extends along the length direction X. The battery cell 11 is electrically connected to the protection plate 20 through the connecting portion 112 .

[0034] In some embodiments, the battery cell 11 is a polymer lithium-ion battery cell.

[0035] In some embodiments, the number of the protection plates 20 is two, and one protection plate 20 corresponds to one battery cell group 10 in quantity. Figure 1 to Figure 3 as well as Figure 5 In the illustrated embodiment, the protective plates 20 correspond one to one with the battery cell groups 10 in number, that is, there are two protective plates 20, including a first protective plate 201 and a second protective plate 202, the protective plate 20 extends along the width direction Y, the first protective plate 201 and the second protective plate 202 are arranged at intervals along the length direction X, the first protective plate 201 corresponds to the first battery cell group 101, the battery cells 11 in the first battery cell group 101 are electrically connected to the first protective plate 201 via the connecting portion 112, the second protective plate 202 corresponds to the second battery cell group 102, the battery cells 11 in the second battery cell group 102 are electrically connected to the second protective plate 202 via the connecting portion 112.

[0036] In some embodiments, the protection board 20 is a printed circuit board PCB, and a protection circuit module PCM is disposed on the protection board 20 .

[0037] In some embodiments, reference Figure 1 to Figure 3 The number of the circuit board 30 in the battery pack 1 is one, as shown in FIG. Figure 1 to Figure 3In the illustrated embodiment, one circuit board 30 corresponds to two protection boards 20 in number, and the circuit board 30 includes a first end 31 and a second end 32 arranged opposite to each other along its length direction, the first end 31 is electrically connected to the first protection board 201, and the second end 32 is electrically connected to the second protection board 202, wherein the circuit board 30 can be bent to allow the first battery cell group 101 and the second battery cell group 102 to move relative to each other. Specifically, the first battery cell group 101 is electrically connected to the first protection board 201 to form a first battery unit, and the second battery cell group 102 is electrically connected to the second protection board 202 to form a second battery unit, and the first protection board 201 and the second protection board 202 are connected through the circuit board 30, so that the first battery unit and the second battery unit can move relative to each other.

[0038] In some embodiments, reference Figure 1 to Figure 3 The protective film 40 covers the connection portion 112 between the protective plate 20 and the battery cell 11, referring to Figure 7 The protective film 40 includes a first section 41 and a second section 42 arranged along the length direction X. The orthographic projection of the protective plate 20 in the thickness direction Z falls within the first section 41, and the orthographic projection of the connecting portion 112 in the thickness direction Z falls within the second section 42, thereby achieving connection protection for the protective plate 20 and the connecting portion 112, and achieving insulation protection for the connecting portion 112 and the protective plate 20.

[0039] In existing electronic devices, such as wearable electronic devices, the battery compartment for placing the battery pack has an arc shape, but most existing battery packs are designed to be straight and cannot be bent, resulting in the inability to be loaded in a battery compartment with a curved shape. In addition, in existing electronic devices, the connection between the connection part of the battery cell and the protection board lacks insulation protection. The connection part and the protection board are easily affected by static electricity inside the electronic device and the current of the electronic components inside the electronic device, resulting in the stability of the current transmission between the connection part and the protection board being affected, and further resulting in a decrease in the power supply efficiency of the battery pack to the electronic device.

[0040] The battery pack 1 provided in the embodiment of the present application connects two groups of battery cell groups 10 through a circuit board 30, and the circuit board 30 can be bent, so that the two groups of battery cell groups 10 can move relative to each other, and the circuit board 30 can be bent according to the curvature of the battery compartment to match the curvature of the battery compartment, so that the battery pack 1 can be suitable for a bending use environment, wherein the number of bending times of the circuit board 30 can meet 500,000 bending times without affecting the use. In addition, a protective film 40 is covered on the connection portion 112 between the protection plate 20 and the battery cell 11 to form an insulating protection for the protection plate 20 and the connection portion 112, to ensure the stability of the current transmission between the protection plate 20 and the connection portion 112, to prevent the protection plate 20 and the connection portion 112 from being affected by the static electricity inside the electronic device and the current of the electronic device, thereby ensuring the stability of the battery pack 1 supplying power to the electronic device, and to improve the service life of the battery pack 1.

[0041] In some embodiments, the circuit board 30 is a flexible circuit board FPC. Figure 1 to Figure 3 The three battery cells 11 in the first battery cell group 101 are electrically connected to the first protection plate 201 respectively, and the three battery cells 11 in the first battery cell group 101 are connected in series through the first protection plate 201 .

[0042] In some embodiments, reference Figure 1 to Figure 3 The three battery cells 11 in the first battery cell group 101 are electrically connected to the first protection plate 201 respectively, and the three battery cells 11 in the first battery cell group 101 are connected in parallel through the first protection plate 201 .

[0043] In some embodiments, reference Figure 1 to Figure 3 The three battery cells 11 in the second battery cell group 102 are electrically connected to the second protection plate 202 respectively, and the three battery cells 11 in the second battery cell group 102 are connected in series through the second protection plate 202 .

[0044] In some embodiments, reference Figure 1 to Figure 3 The three battery cells 11 in the second battery cell group 102 are electrically connected to the second protection plate 202 respectively, and the three battery cells 11 in the second battery cell group 102 are connected in parallel through the second protection plate 202 .

[0045] In some embodiments, reference Figure 1 to Figure 3 The three battery cells 11 in the first battery cell group 101 and the three battery cells 11 in the second battery cell group 102 are connected in series through the circuit board 30 .

[0046] In some embodiments, reference Figure 1 to Figure 3 The three battery cells 11 in the first battery cell group 101 and the three battery cells 11 in the second battery cell group 102 are connected in parallel via the circuit board 30 .

[0047] The parallel connection between the two groups of battery cell groups 10 can increase the capacity of the battery pack 1, improve the endurance, and meet the long-term use of the user. The series connection between the two groups of battery cell groups 10 can increase the voltage platform of the battery pack 1 and provide the necessary conditions for high-power charging and discharging. Specifically, for the battery pack 1 composed of six battery cells 11, the available series-parallel combinations include: 6 battery cells 11 are connected in parallel to each other (1 series and 6 parallels, 1S6P), 2 groups of battery cell groups 10 are connected in series, and each group of battery cell groups 10 includes 3 parallel battery cells 11 (2 series and 3 parallels, 2S3P), 3 groups of battery cell groups 10 are connected in series, and each group of battery cell groups 10 includes 2 parallel battery cells 11 (3 series and 2 parallels, 3S2P) and 6 battery cells 11 are connected in series to each other (6 series and 1 parallel, 6S1P). Such a battery pack has four output modes, namely 1S6P mode, 2S3P mode, 3S2P mode and 6S1P mode. It should be noted that in the existing battery pack 1, the rated voltage of a battery cell 11 is about 3.7V. Therefore, it can be obtained that the output voltage of the battery in 1S6P mode is 3.7V, the output voltage in 2S3P mode is 7.4V, the output voltage in 3S2P mode is 11.1V, and the output voltage in 6S1P mode is 22.2V.

[0048] In some embodiments, the first battery cell group 101 and the second battery cell group 102 can be stacked along the thickness direction Z. Specifically, the circuit board 30 can be bent so that the three battery cells 11 in the first battery cell group 101 can be stacked with the three battery cells 11 in the second battery cell group 102 along the thickness direction Z. The two battery cells 11 stacked in the thickness direction Z can be fixed by glue or tape, thereby ensuring the stability and firmness of the first battery cell group 101 and the second battery cell group 102 after being stacked along the thickness direction Z, thereby improving the service life of the battery pack 1. In some embodiments, refer to Figure 3 and Figure 5 The protective plate 20 includes two surfaces 21 arranged opposite to each other along the thickness direction Z. Figure 1 to Figure 3 In the illustrated embodiment, a protective film 40 is provided on each of the two surfaces 21 of the protective plate 20, and the protective film 40 can provide insulation protection for the protective plate 20, thereby improving the service life of the protective plate 20. Specifically, the first section 41 of the protective film 40 covers the surface 21 of the protective plate 20, and the second section 42 of the protective film 40 covers the connecting portion 112 of the battery cell 11, thereby achieving connection protection for the protective plate 20 and the connecting portion 112, and achieving insulation protection for the connecting portion 112 and the protective plate 20. The connecting portion 112 is the tab of the battery cell 11.

[0049] In some embodiments, the protective film 40 is a Mylar film.

[0050] In some embodiments, reference Figure 1 to Figure 3 as well as Figure 6The circuit board 30 includes two wall surfaces 33 arranged opposite to each other along the thickness direction Z, and a heat dissipation layer is arranged on each of the two wall surfaces 33. The structural design of the heat dissipation layer can improve the heat dissipation capacity of the circuit board 30, prevent the circuit board 30 from overheating and affecting the use effect, and improve the service life of the circuit board 30.

[0051] In some embodiments, the heat dissipation layer is a boron nitride coating or a graphene coating.

[0052] In some embodiments, reference Figure 1 to Figure 3 The battery pack 1 also includes a connecting member 50, and the connecting member 50 includes a first connecting end 51 and a second connecting end 52 that are arranged opposite to each other along its length direction. Figure 1 to Figure 3 In the illustrated embodiment, the first connection end 51 is electrically connected to the second protection plate 202, and the second connection end 52 can be electrically connected to an electrical device. Specifically, the second connection end 52 can be electrically connected to a terminal such as a display screen to provide power to the terminal.

[0053] In some embodiments, the first connection end 51 is connected to the second protection plate 202 by laser welding to ensure connection stability and connection firmness.

[0054] In some embodiments, reference Figure 1 to Figure 3 The battery cell group 10 has a first side end 10a and a second side end 10b that are relatively arranged along the length direction X. The battery cell group 10 is electrically connected to the protection plate 20 through the first side end 10a. The protection plate 20 extends along the width direction Y. Specifically, the connection portion 112 of the battery cell 11 in the battery cell group 10 is arranged at the first side end 10a of the battery cell group 10, and the battery cell group 10 is electrically connected to the protection plate 20 through the connection portion 112 arranged at the first side end 10a.

[0055] The technical solutions provided by the embodiments of the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in detail using specific examples. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A battery pack, characterized in that: include: Two groups of battery cell groups (10), the battery cell groups (10) having a length direction (X) and a thickness direction (Z), each group of the battery cell groups (10) comprising at least one battery cell (11), the battery cell (11) comprising a main body (111) and a connecting portion (112), the connecting portion (112) being protrudingly arranged on an end surface of one end of the main body (111) in the length direction (X), and the connecting portion (112) extending along the length direction (X); Two protection plates (20), the battery cells (11) in one group of the battery cell groups (10) being electrically connected to one of the protection plates (20) via the connection portion (112), and the battery cells (11) in the other group of the battery cell groups (10) being electrically connected to the other protection plate (20) via the connection portion (112); A circuit board (30), the circuit board (30) comprising a first end (31) and a second end (32) arranged opposite to each other, the first end (31) being electrically connected to one of the two protection boards (20), the second end (32) being electrically connected to the other of at least the two protection boards (20), the circuit board (30) being bendable so as to enable relative movement between the two groups of battery cell groups (10); A protective film (40), wherein the protective film (40) covers the protective plate (20) and the connecting portion (112), the protective film (40) comprising a first section (41) and a second section (42) arranged along the length direction (X), the orthographic projection of the protective plate (20) in the thickness direction (Z) falling within the first section (41), and the orthographic projection of the connecting portion (112) in the thickness direction (Z) falling within the second section (42).

2. The battery pack according to claim 1, wherein: The number of battery cells (11) in each battery cell group (10) is at least two, and at least two of the battery cells (11) are electrically connected to the protection plate (20) respectively; At least two of the battery cells (11) in each battery cell group (10) are connected in series and / or in parallel via the protection plate (20); The battery cells (11) in the at least two battery cell groups (10) are connected in series and / or in parallel via the circuit board (30).

3. The battery pack according to claim 1, wherein: The two groups of battery cell groups (10) can be stacked along the thickness direction (Z) by bending the circuit board (30).

4. The battery pack according to claim 3, characterized in that: The two groups of battery cell groups (10) stacked along the thickness direction (Z) are bonded and fixed.

5. The battery pack according to claim 1, wherein: The protection plate (20) comprises two surfaces (21) arranged opposite to each other along a thickness direction (Z); The protective film (40) is provided on at least one of the two surfaces (21).

6. The battery pack according to claim 1, wherein: The circuit board (30) comprises two wall surfaces (33) arranged opposite to each other along the thickness direction thereof; A heat dissipation layer is provided on at least one of the two wall surfaces (33).

7. The battery pack according to claim 6, characterized in that: The heat dissipation layer is a boron nitride coating or a graphene coating.

8. The battery pack according to claim 1, wherein: The battery pack further comprises a connecting member (50), wherein the connecting member (50) comprises a first connecting end (51) and a second connecting end (52) arranged opposite to each other along its length direction, wherein the first connecting end (51) is electrically connected to one of the protection plates (20), and the second connecting end (52) can be electrically connected to an electrical device.

9. The battery pack according to claim 1, wherein: The battery cell group (10) has a width direction (Y), the battery cell group (10) has a first side end (10a) and a second side end (10b) arranged opposite to each other along the length direction (X), the battery cell group (10) is electrically connected to the protection plate (20) via the first side end (10a), and the protection plate (20) extends along the width direction (Y).

10. An electronic device, characterized in that: A battery pack comprising the battery pack according to any one of claims 1 to 9.

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