CN217426855U - Battery protection board, battery and terminal equipment - Google Patents

Abstract

The application relates to a battery protection board, a battery and a terminal device. The battery protection board comprises a circuit board, a protection device and a heat dissipation layer. The circuit board is provided with a first surface and a second surface which are mutually deviated in a first direction; the protection device is arranged on the first surface of the circuit board; the heat dissipation layer is arranged on the second surface of the circuit board and provided with a heat dissipation channel, and the heat dissipation channel penetrates through two ends of the heat dissipation layer in the second direction. Above-mentioned structure, the circuit board surface through at the battery protection shield sets up the heat dissipation layer that has heat dissipation channel, is favorable to dispelling the heat to the circuit board, improves the life of battery protection shield.

Description

Battery protection board, battery and terminal equipment

Technical Field

The application relates to the technical field of terminals, in particular to a battery protection board, a battery and terminal equipment.

Background

Along with the charging current is bigger and bigger, the calorific capacity of the battery protection board is bigger and bigger, the temperature rise of the battery protection board is larger, and the use of the battery protection board and the whole battery is seriously influenced. In order to reduce the temperature rise of the battery protection board, in the related art, a low-resistance overcurrent device is generally used. However, the low-resistance overcurrent device is adopted, so that the development cost is high and the development difficulty is high.

SUMMERY OF THE UTILITY MODEL

The application provides a battery protection shield, battery and terminal equipment is favorable to dispelling the heat to the battery protection shield.

According to a first aspect of embodiments of the present application, there is provided a battery protection plate including:

a circuit board having a first surface and a second surface facing away from each other in a first direction;

the protection device is arranged on the first surface of the circuit board;

the heat dissipation layer is arranged on the second surface of the circuit board and provided with a heat dissipation channel, and the heat dissipation channel penetrates through the two ends of the heat dissipation layer in the length direction of the battery protection board.

In some embodiments, the heat dissipation layer includes a first heat dissipation portion connected to the second surface of the circuit board, and a second heat dissipation portion and a third heat dissipation portion located at two opposite ends of the first heat dissipation portion in the second direction, and the heat dissipation channel penetrates through the second heat dissipation portion, the first heat dissipation portion, and the third heat dissipation portion.

In some embodiments, the dimension of the second heat sink member in the third direction on the side facing away from the first heat sink member is smaller than the dimension of the second heat sink member in the third direction on the side close to the first heat sink member;

the size of the third heat sink piece in the third direction on the side of the third heat sink piece away from the first heat sink piece is smaller than the size of the third heat sink piece in the third direction on the side of the third heat sink piece close to the first heat sink piece.

In some embodiments, the heat sink channel includes a first channel segment at the first heat sink piece, a second channel segment at the second heat sink piece, and a third channel segment at the third heat sink piece; wherein the radial dimension of the second channel section decreases in a direction from a side adjacent the first channel section toward a side facing away from the first channel section; and/or the radial dimension of the third channel segment is gradually reduced in the direction from the side close to the first channel segment to the side far away from the first channel segment.

In some embodiments, the first heat sink piece comprises a plurality of first channel segments, the second heat sink piece comprises a plurality of second channel segments, and the third heat sink piece comprises a plurality of third channel segments; the plurality of second channel sections, the plurality of first channel sections and the plurality of third channel sections are correspondingly communicated one by one; the distance between every two adjacent second channel sections is gradually reduced in the direction from one side close to the first channel section to one side far away from the first channel section; and/or the distance between two adjacent third channel segments is gradually reduced in the direction from one side close to the first channel segment to the side far away from the first channel segment; or the like, or, alternatively,

the first heat sink part comprises a plurality of first channel sections, the second heat sink part comprises a second channel section, the third heat sink part comprises a third channel section, and two ends of the first channel sections are respectively connected with the second channel section and the third channel section.

In some embodiments, the heat dissipation channel is a microchannel structure.

In some embodiments, the heat dissipation layer is attached to the second surface of the circuit board through an adhesive layer.

In some embodiments, the first surface of the circuit board is provided with a heat sink.

In some embodiments, the circuit board has a circuit structure, and the heat sink is soldered to the circuit structure.

In some embodiments, the circuit structure includes a connection circuit structure for connecting the battery cell with an external structure, and the heat sink is soldered to at least the connection circuit structure.

In some embodiments, the protection device is exposed to a side where the first surface of the protection plate is located; or the like, or, alternatively,

the battery protection board further comprises a plastic package structure located on the first surface of the circuit board, and the protection device is wrapped in the plastic package structure.

According to a second aspect of the embodiments of the present application, there is provided a battery, the battery including a battery cell and the battery protection plate as described above, the battery protection plate being electrically connected to the electrode connection end of the battery cell.

In some embodiments, the battery cell is located at one end of the battery protection board in the third direction, and the thickness direction of the battery cell coincides with the first direction.

According to a third aspect of embodiments of the present application, there is provided a terminal device, which includes the battery as described above.

In some embodiments, the terminal device includes a frame, the battery is disposed in the frame, the frame is provided with two sets of ventilation holes corresponding to two ends of the heat dissipation channel, and the heat dissipation channel is communicated with the outside of the terminal device through the two sets of ventilation holes.

The application battery protection board, battery and terminal equipment, the circuit board surface through at the battery protection board sets up the heat dissipation layer that has heat dissipation channel, is favorable to dispelling the heat to the circuit board, is favorable to improving the life of battery protection board to be favorable to improving the life of the battery that has this type of battery protection board.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view illustrating a structure of a battery protection plate according to an exemplary embodiment;

fig. 2 is a schematic structural view illustrating another battery protection plate according to an exemplary embodiment;

FIG. 3 is a schematic diagram illustrating the structure of a battery according to an exemplary embodiment;

fig. 4 is a schematic diagram illustrating a partial structure of a terminal device according to an exemplary embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used in the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It will be understood that, depending on the context, the word "if" as used herein may be interpreted as "at … …" or "at … …" or "in response to a determination".

The application provides a battery protection shield, battery protection shield includes circuit board, protection device and heat dissipation layer. The circuit board has a first surface and a second surface that are away from each other in a thickness direction of the battery protection board. The protection device is arranged on the first surface of the circuit board. The heat dissipation layer is connected to the second surface of circuit board, the heat dissipation layer has heat dissipation channel, heat dissipation channel runs through the heat dissipation layer is in battery protection shield length direction's both ends. Above-mentioned battery protection board sets up the heat dissipation layer that has heat dissipation channel through the circuit board surface at battery protection board, is favorable to dispelling the heat to the circuit board, is favorable to improving the life of battery protection board to be favorable to improving the life of the battery that has this type of battery protection board.

The battery protection plate is described in detail below with reference to fig. 1 and 2.

Referring to fig. 1, fig. 1 provides a battery protection plate 10. The battery protection board is connected to the electrode connecting end of the battery core and used for protecting the battery core. The battery protection board 10 includes a circuit board 11, a protection device 12, and a heat dissipation layer 13. The circuit board 11 has a first surface 101 and a second surface facing away from each other in said battery protection plate first direction S1. The circuit board 11 has a circuit structure therein. The protection device 12 is disposed on the first surface 101 of the circuit board 11 and is electrically connected to the circuit structure in the circuit board 11. The heat dissipation layer 13 is connected to the second surface of the circuit board 11, the heat dissipation layer 13 has a heat dissipation channel 130, and the heat dissipation channel 130 penetrates through two ends of the heat dissipation layer 13 in the second direction S2. Here, the first direction S1 and the second direction S2 form a predetermined angle.

The battery protection plate 10 is an integrated circuit board that protects the battery cell. The method is generally used for protecting the lithium battery in the charging and discharging processes of the lithium battery.

The protection device 12 mainly includes a control chip and a switching device (such as a MOS transistor), and may further include a precision resistor, a temperature sensor, an electric quantity calculating device, and the like. The Temperature sensor may be an ntc (negative Temperature coefficient) thermistor. The protection device 12 is specifically configured to be electrically connected to a circuit structure in the circuit board 11 to form a protection circuit for protecting the battery cell.

The circuit structure in the circuit board 11 described here can be understood as electrical connection lines arranged according to actual needs. Specifically, in the battery protection board 10, the protection device 12 is soldered to a specific position of the circuit board 11 as required to form a protection circuit together with the electrical connection wires. When the battery is connected with an external structure to perform charging and discharging processes, the current between the battery core and the external structure is too large or too small, and the voltage is too large or too small, the control chip is disconnected by controlling the switch device, so that the battery core of the battery is protected.

Here, the heat dissipation layer 13 is formed using a heat conductive material. Such as a metal or alloy material, graphite, or the like. The thickness of the device can be set within 1mm, so that the device does not occupy too much space during subsequent installation.

The heat dissipation layer 13 may be provided with a plurality of heat dissipation channels 130 arranged side by side at intervals.

As shown in fig. 1, the heat dissipation layer 13 includes a first heat dissipation portion 131 connected to the second surface of the circuit board 11, and a second heat dissipation portion 132 and a third heat dissipation portion 133 located at two opposite ends of the first heat dissipation portion 131 in the second direction S2, and the heat dissipation channel 130 penetrates through the second heat dissipation portion 132, the first heat dissipation portion 131, and the third heat dissipation portion 133.

Here, both end portions of the second heat sink member 132 and the third heat sink member 133 may be flat as a whole, and end surfaces may be aligned with a width direction for easy mounting.

In some embodiments, the heat dissipation layer 13 is narrowed at both ends to facilitate installation of both ends and control of the occupied space. As shown in fig. 1, the size of the second heat sink member 132 in the third direction S3 on the side facing away from the first heat sink member 131 is smaller than the size of the second heat sink member 132 in the third direction S3 on the side close to the first heat sink member 131.

Accordingly, the size of the third heat sink member 133 in the third direction S3 on the side facing away from the first heat sink member 131 is smaller than the size of the third heat sink member 133 in the third direction S3 on the side close to the first heat sink member 131.

Here, the third direction S3 is at a predetermined angle with respect to the plane defined by the first direction S1 and the second direction S2. For example, in some embodiments, the first direction S1, the second direction S2, and the third direction S3 may be perpendicular two by two. Alternatively, the first direction S1 may be a thickness direction of the battery protection plate 10, and the second direction S2 may be a length direction of the battery protection plate 10. The third direction may be a width direction of the battery protection plate 10.

Here, the projections of the second heat sink member 132 and the third heat sink member 133 in the first direction S1 of the battery protection plate 10 have a trapezoidal structure.

The heat dissipation channel 130 includes a first channel section 1301 positioned at the first heat dissipation part 131, a second channel section 1302 positioned at the second heat dissipation part 132, and a third channel section 1303 positioned at the third heat dissipation part 133. Wherein the radial dimension of the side of the second channel segment 1302 close to the first channel segment 1301 is larger than the radial dimension of the side of the second channel segment 1302 facing away from the first channel segment 1301. The radial dimension of the third channel segment 1303 on the side close to the first channel segment 1301 is greater than the radial dimension on the side away from the first channel segment 1301.

For example, in some embodiments, the radial dimension of the second channel segment 1302 decreases in a direction from a side proximate the first channel segment 1301 toward a side facing away from the first channel segment 1301. The radial dimension of the third channel segment 1303 decreases in a direction from the side close to the first channel segment 1301 to the side away from the first channel segment 1301.

In some embodiments, the first heat sink piece 131 includes a plurality of first channel segments 1301, the second heat sink piece 132 includes a plurality of second channel segments 1302, and the third heat sink piece 133 includes a plurality of third channel segments 1303; the plurality of second channel segments 1302, the plurality of first channel segments 1301, and the plurality of third channel segments 1303 are in one-to-one correspondence communication. Wherein the distance between two adjacent second channel segments 1302 gradually decreases in a direction from a side close to the first channel segment 1301 to a side away from the first channel segment 1301; the distance between two adjacent third channel segments 1303 decreases gradually in a direction from a side close to the first channel segment 1301 to a side away from the first channel segment 1301.

Here, the second heat sink member 132 and the third heat sink member 133 are respectively provided with the same number of passage sections as the first heat sink member 131, and a plurality of heat dissipation passages 130 penetrating through the heat dissipation layer at opposite ends of the heat dissipation layer in the second direction S2 are formed in the heat dissipation layer 13.

Accordingly, the aperture of the heat dissipation channel 130 at the second channel section 1302 of the second heat sink member 132 is smaller than the aperture of the heat dissipation channel 130 at the first channel section 1301 of the first heat sink member 131. The aperture of the third channel segment 1303 of the heat dissipation channel 130 in the third heat sink piece 133 is smaller than that of the first channel segment 1301 of the heat dissipation channel 130 in the first heat sink piece 131.

In other embodiments, the first heat sink member 131 includes a plurality of first channel segments 1301, the second heat sink member 132 includes a second channel segment 1302, and the third heat sink member 133 includes a third channel segment 1303, and two ends of the plurality of first channel segments 1301 are respectively connected to the second channel segment 1302 and the third channel segment 1303.

Here, the second heat sink piece 132 has only one larger second channel segment. The third heat sink piece 133 has only one larger channel segment. The air flows at two ends of the plurality of first channel segments 1301 in the first heat sink portion 131 are respectively communicated with the second channel segments and the third channel segments.

In some other embodiments, the second heat sink piece can also be provided with a plurality of second channel segments, and each second channel segment is communicated with a plurality of first channel segments. The third heat sink member may be provided as well.

In other embodiments, the second heat sink part and the third heat sink part may be only one narrowing from the first heat sink part to the back discrete heat part. Or neither.

In some embodiments, the heat dissipation channel 130 is a micro-channel structure. A microchannel structure is understood here to mean a channel structure of comparatively small radial dimensions. The radial dimension of the micro-channel structure can be set to be 0.2mm-0.5mm, so that the strength of the heat dissipation layer 13 is ensured, and airflow flowing is well realized, so that heat dissipation is well realized.

In some embodiments, the heat dissipation layer 13 is attached to the second surface of the circuit board 11 by an adhesive layer. The adhesive layer may be a thermally conductive adhesive.

Of course, in other embodiments, the heat dissipation layer may also be integrated with the circuit board, and accordingly, the circuit structure is disposed in the corresponding portion of the circuit board, and the heat dissipation channel is disposed inside the corresponding portion of the heat dissipation layer.

In some embodiments, the first surface 101 of the circuit board 11 is provided with a heat sink 14. The heat sink 14 may be formed of a thermally conductive material that provides a thermal conductivity to conduct some of the heat in the circuit structure. Optionally, the heat-conducting property of the heat sink 14 is better than the heat-conducting property of the plastic package structure.

In some embodiments, the heat sink 14 is soldered to the circuit structure so as to direct heat generated by the circuit structure to the heat sink 14 to further facilitate heat dissipation from the battery protection board.

The heat sink is here formed of a heat conducting material. The material may be a metal material, such as metal aluminum, or an aluminum alloy, copper, or a non-metal material, which is not limited in this application and may be set according to specific situations.

Where the heat sink is soldered to the circuit structure, it may be formed in synchronism with the protection device 12, facilitating the process of separately placing the heat sink.

In other embodiments, the heat sink may be disposed on the first surface of the circuit board using adhesive or other fastening points. In addition, the heat sink may also be attached to other locations of the first surface of the circuit board.

In some embodiments, the circuit structure includes a connection circuit structure for connecting the battery cell with an external structure, and the heat sink is soldered to at least the connection circuit structure.

The connecting circuit structure is connected with the control chip, the switch device and the precision resistor to form a connecting circuit which is directly connected with the anode of the battery cell and an external structure. This connecting circuit, at battery charging, the in-process that discharges, lug connection electricity core and exterior for transmit the exterior circuit for electric core charge, or transmit the electric quantity in the electric core to the exterior, for the exterior provides the electric energy. Because the passing current of the connecting circuit is larger, the correspondingly generated heat is also larger, and the heat radiating piece is welded on the power circuit structure, thereby being beneficial to improving the heat radiating effect.

Of course, the circuit structure may further include a power calculation circuit structure to which the power calculation device is connected to form a power calculation circuit in connection with the power calculation device. The electric quantity calculating circuit is used for acquiring data such as current, voltage and the like in the charging and discharging processes of the battery core, and the control chip can control the on and off of the switch device through the data. Accordingly, in other embodiments, the heat dissipation element may also be soldered to the circuit computing circuit structure, and may of course be connected to other circuit structures.

Further, the battery protection plate 10 has an external connection structure such as a flexible circuit board 15. The flexible circuit board 15 is provided with an electrical connector 16 for electrical connection with other structures.

Referring to fig. 2, the present application provides another battery protection plate 10 ', which is different from the battery protection plate 10 shown in fig. 1, in that a first surface 101 of a circuit board 11 of the battery protection plate 10' is encapsulated with a plastic encapsulation structure 17 to encapsulate a protection device 12, a heat sink 14, and the like. In the battery protection board 10 shown in fig. 1, the protection device 12, the heat sink 14, and the like are exposed. That is, In the present application, the battery protection plate 10' shown In fig. 2 is formed by a System In Package (SIP) method. The battery protection board 10 shown in fig. 1 is formed by a surface mounting method (in which the protection device 12, the heat sink 14, and the like are directly attached to the surface of the protection board 11).

Referring to fig. 3, the present application further provides a battery 100. The battery 100 includes a battery cell 20 and the battery protection plate 10 as described above, and the battery protection plate 10 is electrically connected to the electrode connecting end of the battery cell 20.

Here, the battery 100 may be a lithium battery, and may be other batteries.

The electrical core 20 here has an electrode connection end 21 and an electrode connection end 22. One of the electrode connecting end 21 and the electrode connecting end 22 is a battery positive electrode tab, and the other is a battery negative electrode tab.

The battery cells 20 are electrically connected to the battery protection plate 10 via the electrode connections 21, 22, so that power is supplied to the outside via the battery protection plate 10.

The battery core 20 is located at one end of the battery protection plate 10 in the third direction S3. The thickness direction of the battery cell 20 is consistent with the first direction S1, so that the heat dissipation layer 13 of the battery protection board 10 is disposed on one side of the protection board 11 along the thickness direction of the whole battery 100, and the size of the battery cell 20 is not occupied by the heat dissipation layer 13, thereby facilitating the improvement of heat dissipation of the battery protection board 10, ensuring the size of the battery cell and ensuring the battery capacity. The longitudinal direction L0 of the battery cell 20 coincides with the third direction S3 of the battery protection plate 10, and the width direction W0 of the battery cell 20 coincides with the second direction S2 of the battery protection plate 10.

Referring to fig. 4, the present application further provides a terminal device 1000. The terminal device 1000 includes the battery 100 as described above.

As shown in fig. 4, in some embodiments, the terminal device 1000 includes a bezel 200. The battery 100 is disposed in a space surrounded by the frame 200. The frame 200 is provided with two sets of ventilation holes 201 and 202 corresponding to two ends of the heat dissipation channel 130. The heat dissipation channel 130 is communicated with the outside of the terminal device 1000 through two sets of the ventilation holes 201 and 202.

Specifically, the terminal device 1000 further includes other housing structures. The frame 200 and other housing structures of the terminal device 1000 together enclose a housing cavity 1001. The housing cavity 1001 includes a battery housing space for housing the battery 100 therein.

The frame 200 is provided with a clamping groove at the positions of the ventilation holes 201 and 202, the heat dissipation layer 13 can be clamped in the clamping groove, and two ends of the heat dissipation channel 130 are respectively in involution communication with the ventilation holes 201 and 202. And the heat dissipation layer 13 and the frame 200 are sealed around the ventilation holes 201 and 202 to prevent water leakage or dust from entering the inside of the terminal device from the connection position of the heat dissipation layer 13 and the frame 200. In some embodiments, the sealing may be performed with a sealant.

After the battery 100 is mounted in the terminal device 1000, the thickness direction (the direction perpendicular to the paper surface in fig. 4) of the terminal device 1000 coincides with the first direction S1 of the battery protection plate 10. The length direction L of the terminal device coincides with the third direction S3 of the battery protection plate 10, and the width direction W of the terminal device coincides with the second direction S2 of the battery protection plate 10.

In some embodiments, a main control board is further disposed in the housing cavity 1001, and the battery protection board 10 of the battery 100 is electrically connected to the main control board 300. Specifically, the main control board 300 may be connected through the connector 16 to supply power to the main control board 300.

In some embodiments, the terminal device 1000 is a mobile phone, and accordingly, the frame can be a middle frame of the mobile phone.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims (15)

1. A battery protection plate, characterized by comprising:

a circuit board having a first surface and a second surface facing away from each other in a first direction;

the protection device is arranged on the first surface of the circuit board;

the heat dissipation layer is arranged on the second surface of the circuit board and provided with heat dissipation channels, and the heat dissipation channels penetrate through two ends of the heat dissipation layer in the second direction.

2. The battery protection board according to claim 1, wherein the heat dissipation layer includes a first heat dissipation part connected to the second surface of the circuit board, and a second heat dissipation part and a third heat dissipation part located at opposite ends of the first heat dissipation part in the second direction, and the heat dissipation channel penetrates through the second heat dissipation part, the first heat dissipation part, and the third heat dissipation part.

3. The battery protection plate as claimed in claim 2, wherein the dimension of the second heat sink member in the third direction on the side away from the first heat sink member is smaller than the dimension of the second heat sink member in the third direction on the side close to the first heat sink member; and/or the presence of a gas in the gas,

the size of the third heat sink piece in the third direction on the side of the third heat sink piece away from the first heat sink piece is smaller than the size of the third heat sink piece in the third direction on the side of the third heat sink piece close to the first heat sink piece.

4. The battery protection plate of claim 3, wherein the heat dissipation channel comprises a first channel segment at the first heat dissipation part, a second channel segment at the second heat dissipation part, and a third channel segment at the third heat dissipation part; wherein the radial dimension of the second channel section decreases in a direction from a side adjacent the first channel section toward a side facing away from the first channel section; and/or the radial dimension of the third channel segment is gradually reduced in the direction from the side close to the first channel segment to the side far away from the first channel segment.

5. The battery protection plate as claimed in claim 3 or 4, wherein the first heat sink member includes a plurality of first channel segments, the second heat sink member includes a plurality of second channel segments, and the third heat sink member includes a plurality of third channel segments; the plurality of second channel sections, the plurality of first channel sections and the plurality of third channel sections are correspondingly communicated one by one; wherein the distance between two adjacent second channel segments is gradually reduced in the direction from one side close to the first channel segment to the side away from the first channel segment; and/or the distance between two adjacent third channel segments is gradually reduced in the direction from one side close to the first channel segment to the side far away from the first channel segment; or the like, or, alternatively,

the first heat dissipation part comprises a plurality of first channel sections, the second heat dissipation part comprises a second channel section, the third heat dissipation part comprises a third channel section, and two ends of the first channel sections are respectively connected with the second channel section and the third channel section.

6. The battery protection plate as claimed in claim 1, wherein the heat dissipation channel has a micro-channel structure.

7. The battery protection board as claimed in claim 1, wherein the heat dissipation layer is attached to the second surface of the circuit board by an adhesive layer.

8. The battery protection board as claimed in claim 1, wherein the first surface of the circuit board is provided with a heat sink structure.

9. The battery protection board of claim 8, wherein the circuit board has a circuit structure, and the heat sink is soldered to the circuit structure.

10. The battery protection panel as claimed in claim 9, wherein the circuit structure includes a connection circuit structure for connecting the battery cell with an external structure, and the heat sink is welded to at least the connection circuit structure.

11. The battery protection plate as claimed in claim 1, wherein the protection device is exposed to a side of the protection plate where the first surface is located; or the like, or, alternatively,

the battery protection board further comprises a plastic package structure located on the first surface of the circuit board, and the protection device is wrapped in the plastic package structure.

12. A battery comprising a cell and the battery protection sheet of any one of claims 1 to 11 electrically connected to an electrode connecting end of the cell.

13. The battery of claim 12, wherein the cell is located at one end of the battery protection plate in the third direction, and a thickness direction of the cell coincides with the first direction.

14. A terminal device characterized in that it comprises a battery according to claim 12 or 13.

15. The terminal device according to claim 14, wherein the terminal device includes a frame, the battery is disposed in the frame, the frame is provided with two sets of ventilation holes corresponding to two ends of the heat dissipation channel, respectively, and the heat dissipation channel is communicated with the outside of the terminal device through the two sets of ventilation holes.

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