Patent Description:
When a battery is in use, a cell will generate a large amount of heat. To avoid the battery temperature being extremely high, it is necessary to dissipate heat of the battery. The traditional way of dissipating heat is to increase a heat dissipation member between cells, but this way of dissipating heat is limited to heat dissipation of the cells.

In view of this, it is necessary to provide a battery pack and an electric device, so as to improve heat dissipation of a cell.

The present invention provides a battery pack including a housing assembly, a cell assembly, a first circuit board, a support, and a thermally conductive member. The cell assembly is accommodated in the housing assembly. The cell assembly includes a plurality of cells. Each cell includes a cell housing, an electrode assembly disposed in the cell housing, and an electrode terminal connected to the electrode assembly and extending out of the cell housing. The electrode terminal runs through the first circuit board and is connected to a side of the first circuit board facing away from the cell housing. The support is connected to the first circuit board, where the first circuit board is disposed between the cell housing and the support. The support is provided with a first opening, and the thermally conductive member is disposed in the first opening. The thermally conductive member is connected to at least some of electrode terminals. The support is provided with the first opening, the thermally conductive member is disposed in the first opening, and the thermally conductive member is connected to the at least some of electrode terminals, so that heat of the electrode terminal is dissipated through the thermally conductive member, thereby improving heat dissipation efficiency. The cell housing and the first circuit board are disposed in a first direction. The plurality of cells are stacked in a third direction. The battery pack further includes a heat sink. The heat sink is disposed on a side of the support facing away from the first circuit board. The thermally conductive member includes a first surface and a second surface disposed opposite to each other in the first direction. The first surface is connected to the electrode terminal of at least some of the plurality of cells through the first opening. The second surface is connected to the heat sink. The heat sink is disposed, so that heat of the electrode terminal is conducted through the first surface to the second surface and through the second surface to the heat sink, which facilitates conduction of heat of the electrode terminal.

Optionally in some embodiments of this application, the first circuit board is provided with a first conductive sheet. Electrode terminals of adjacent cells run through the first circuit board and are connected to the first conductive sheet in a stacked manner. The thermally conductive member is connected to a side of the electrode terminal facing away from the first conductive sheet, and the third direction is perpendicular to the first direction. It is convenient for the thermally conductive member to connect the electrode terminal by connecting the electrode terminal through the first circuit board to the first conductive sheet in the stacked manner.

Optionally, in some embodiments of this application, the first conductive sheet may be a copper foil disposed on the first circuit board, where the copper foil is connected to wiring on the first circuit board.

Optionally, in some embodiments of this application, the first conductive sheet may be a conductive sheet disposed on the first circuit board, where the conductive sheet is welded to the first circuit board.

Optionally, in some embodiments of this application, each electrode terminal connected to the first conductive sheet includes two first ends disposed in a second direction. The first opening includes two first edges disposed in the second direction. When viewed in a direction opposite to the first direction, the two first edges are located between the two first ends in the second direction, and the second direction is perpendicular to the first direction. A side end of the electrode terminal is located away from the first opening, reducing the possibility that burrs of the electrode terminal pierce the thermally conductive member.

Optionally, in some embodiments of this application, the first conductive sheet includes two second ends disposed in the second direction. When viewed in a direction opposite to the first direction, the two first ends are located between the two second ends in the second direction. A side end of the first conductive sheet is located away from the first opening, reducing the possibility that burrs of the first conductive sheet pierce the thermally conductive member.

Optionally, in some embodiments of this application, the first surface protrudes from the first opening in a direction opposite to the first direction, helping the first surface to be connected to a welding portion of the electrode terminal. The second surface protrudes from the first opening in the first direction and is connected to the heat sink, helping the second surface to be connected to the heat sink.

Optionally, in some embodiments of this application, the housing assembly includes a first housing. The first housing includes a first wall and a second wall disposed in the third direction, a third wall and a fourth wall disposed in the second direction, and a bottom wall. The bottom wall is connected to the first wall, the second wall, the third wall, and the fourth wall to form a first space. The heat sink is disposed in the first space. The heat sink is connected to inner surfaces of the first wall, the second wall, the third wall, and the fourth wall, and the heat sink may be secured to an inner wall of the first housing.

Optionally, in some embodiments of this application, the battery pack further includes a first connection member. The first connection member is partially disposed between the support and the heat sink. The support and the heat sink are bonded through the first connection member, to seal and insulate a space between the cell assembly and the heat sink. This may reduce a risk of short circuit between the heat sink and the electrode terminal.

Optionally, in some embodiments of this application, in the first direction, a side of the support facing the heat sink is provided with a first convex part. The first convex part is connected to the heat sink. A first gap is provided between the support and the heat sink. The first connection member is partially disposed in the first gap. The first convex part allows for presence of the first gap between a support body and the heat sink, which facilitates the first connection member being disposed in the first gap, to seal and insulate a space between the support and the heat sink.

Optionally, in some embodiments of this application, the support includes the support body. The first opening is provided on the support body. The support body is provided with a plurality of first through holes. At least one of the first through holes is configured to allow the first connection member to flow into the first gap. At least a part of the first connection member is disposed in at least one first through holes. The first through hole is provided to allow the first connection member to flow into the first gap.

Optionally, in some embodiments of this application, when viewed in the direction opposite to the first direction, a part of at least one electrode terminal is located in at least one first through hole, further improving heat dissipation of the electrode terminal; and/or
when viewed in the direction opposite to the first direction, a part of at least one first conductive sheet is located in at least one first through hole, further improving heat dissipation of the first conductive sheet.

Optionally, in some embodiments of this application, the support includes a support body, where the support body covers a part of the first circuit board, insulating the first circuit board.

Optionally, in some embodiments of this application, the first connection member is partially disposed between the first circuit board and the support. The support and the first circuit board are connected by the first connection member, which can further insulate the first circuit board.

Optionally, in some embodiments of this application, a side of the support facing the first circuit board is provided with a second convex part in the direction opposite to the first direction. The second convex part is connected to the first circuit board. A second gap is provided between the support and the first circuit board. The first connection member is partially disposed in the second gap. The second convex part allows for presence of the second gap between the support and the first circuit board, which facilitates the first connection member being partially disposed in the second gap, to seal and insulate a space between the support and the first circuit board.

Optionally, in some embodiments of this application, the first connection member covers a part of the electrode terminal extending out of the cell housing to strengthen fixation of the electrode terminal and improve heat dissipation of the electrode terminal.

Optionally, in some embodiments of this application, all third holes are available for the first connection member to flow between the thermally conductive member and the first circuit board. At least a part of the first connection member is located in the third hole, improving heat dissipation.

Optionally, in some embodiments of this application, the first circuit board is provided with a third hole. When viewed in the direction opposite to the first direction, the third hole is located in the first opening, and the third hole is separated from the first conductive sheet. At least one third hole is configured to allow the first connection member to flow between the thermally conductive member and the first circuit board. At least a part of the first connection member is located in the at least one third hole, further improving heat dissipation.

Optionally, in some embodiments of this application, the first connection member is configured to be formed by providing a flowing first insulation material in the battery pack and curing the first insulation material.

Optionally, in some embodiments of this application, thermal conductivity D of the thermally conductive member satisfies <NUM> W/(mK) ≤ D≤ <NUM> W/(mK), thereby improving a thermally conductive effect of the thermally conductive member.

Optionally, in some embodiments of this application, the thermal conductivity of the thermally conductive member is higher than thermal conductivity of the first connection member, improving a thermally conductive effect of the thermally conductive member.

Optionally, in some embodiments of this application, the first connection member connects the inner surfaces of the first wall, the second wall, the third wall, and the fourth wall, to seal and insulate the first space. The first connection member can improve protection of the battery pack, and reduce influence of external impurities on the first circuit board and the electrode terminal.

Optionally, in some embodiments of this application, the first circuit board further includes a second conductive sheet and a third conductive sheet. In the third direction, an electrode terminal of one of outermost cells is connected to the second conductive sheet, and an electrode terminal of another outermost cell is connected to the third conductive sheet. The support body is provided with a plurality of second through holes. When viewed in the direction opposite to the first direction, a part of the second conductive sheet is located in the second through hole, a part of the third conductive sheet is located in the second through hole, and a part of the first connection member is located in the second through hole; and the third direction is perpendicular to the first direction. Heat of the electrode terminal connected to the second conductive sheet, heat of the second conductive sheet, heat of the electrode terminal connected to the third conductive sheet, and heat of the third conductive sheet are conducted to the heat sink through the first connection member in the second through hole, which facilitates heat dissipation.

Optionally, in some embodiments of this application, when viewed in the direction opposite to the first direction, a part of a fourth conductive sheet is disposed in the second through hole; and heat of an electrode terminal connected to the fourth conductive sheet and heat of the fourth conductive sheet are conducted to the heat sink through the first connection member in the second through hole, which facilitates heat dissipation.

Optionally, in some embodiments of this application, the first housing is provided with a first pore and a second pore, and the heat sink is provided with a first channel. The first channel communicates with the first pore and the second pore, which is conducive to improving heat dissipation efficiency.

Optionally, in some embodiments of this application, a second circuit board and a sampling wire harness are further included. The heat sink is located between the first circuit board and the second circuit board. The heat sink is provided with a third accommodation space. One end of the sampling wire harness is connected to the first circuit board, and another end of the sampling wire harness runs through the third accommodation space and is connected to the second circuit board.

Optionally, in some embodiments of this application, a connection support is further included, where a second space is formed between the connection support and the heat sink. The connection support is provided with a support through hole. The support through hole communicates with second space, which facilitates heat dissipation of the second circuit board by the heat sink. An embodiment of this application further provides an electric device including the battery pack according to any one of the foregoing some embodiments.

According to the above-described battery pack and electric device, the support is provided with the first opening, the thermally conductive member is disposed in the first opening, and the thermally conductive member is connected to at least some of electrode terminals, so that heat of the electrode terminal is dissipated through the thermally conductive member, thereby improving heat dissipation efficiency.

This application will be further described with reference to the accompanying drawings in the following specific some embodiments.

The following specific some embodiments are exemplary rather than restrictive, are intended to provide a basic understanding of this application, and are not intended to identify critical or decisive elements of this application or to limit the protection scope.

When one component is assumed as being "disposed on/in" another component, the component may be provided directly on/in the another component or with a component possibly present therebetween. When one component is assumed as being "connected to" another component, it may be connected to the another component directly or with a component possibly present therebetween.

It can be understood that the term "perpendicular" or "equal" is used to describe an ideal state between two parts. In an actual state of production or use, there may be an approximate "perpendicular" or "equal" state between the two parts. For example, in conjunction with a numerical description, "perpendicular" may refer to a range of included angles between two straight lines of <NUM>°±<NUM>°, "perpendicular" may refer to a range of dihedral angles between two planes of <NUM>°±<NUM>°, or "perpendicular" may refer to a range of included angles between a straight line and a plane of <NUM>°±<NUM>°. The two parts described as "perpendicular" may not be absolutely straight lines or planes, or may be roughly straight lines or planes. From a macroscopic point of view, if a part is a straight line or a plane in an overall extension direction, the part can be regarded as a "straight line" or a "plane".

The term "parallel" is used to describe an ideal state between two parts. In an actual state of production or use, there may be an approximate "parallel" state between the two parts. For example, in conjunction with a numerical description, "parallel" may refer to a range of included angles between two straight lines of <NUM>°±<NUM>°, "parallel" may refer to a range of dihedral angles between two planes of <NUM>°±<NUM>°, or "parallel" may refer to a range of included angles between a straight line and a plane of <NUM>°±<NUM>°. The two parts described as "parallel" may not be absolutely straight lines or planes, or may be roughly straight lines or planes. From a macroscopic point of view, if a part is a straight line or a plane in an overall extension direction, the part can be regarded as a "straight line" or a "plane".

Unless otherwise defined, the term "a plurality of" is used herein to describe the number of parts, and specifically means that there are two or more parts.

Refer to <FIG>. An embodiment of this application provides a battery pack <NUM> including a housing assembly <NUM>, a cell assembly <NUM>, a first circuit board <NUM>, a support <NUM>, and a thermally conductive member <NUM>. The cell assembly <NUM> is disposed in the housing assembly <NUM>. The first circuit board <NUM> is disposed in the housing assembly <NUM> and connected to the cell assembly <NUM>. The cell assembly <NUM> includes a plurality of cells <NUM>, where each cell includes a cell housing <NUM>, an electrode assembly <NUM> disposed in the cell housing <NUM>, and an electrode terminal <NUM> connected to the electrode assembly <NUM> and led out of the cell housing <NUM>. The electrode terminal <NUM> runs through the first circuit board <NUM> and is connected to a side of the first circuit board <NUM> facing away from the cell housing <NUM>. The support <NUM> is connected to a side of the first circuit board <NUM> facing away from the cell assembly <NUM>, and the first circuit board <NUM> is disposed between the cell housing <NUM> and the support <NUM>. The support <NUM> is provided with a first opening 40a. The thermally conductive member <NUM> is disposed in the first opening 40a, where the thermally conductive member <NUM> is connected to at least some of electrode terminals <NUM> through the first opening 40a. Heat of the electrode terminal <NUM> is dissipated through the thermally conductive member <NUM>, improving heat dissipation efficiency.

In an embodiment, the housing assembly <NUM> includes a first housing <NUM> and a second housing <NUM>, and the first housing <NUM> is connected to the second housing <NUM>. The first housing <NUM> includes a first wall <NUM>, a second wall <NUM>, a third wall <NUM>, a fourth wall <NUM>, and a bottom wall <NUM>. The first wall <NUM> and the second wall <NUM> are disposed opposite to each other, and the third wall <NUM> and the fourth wall <NUM> are disposed opposite to each other. The bottom wall <NUM> and the second housing <NUM> are disposed opposite to each other. The first wall <NUM> is connected to the third wall <NUM> and the fourth wall <NUM>, the second wall <NUM> is connected to the third wall <NUM> and the fourth wall <NUM>, and the bottom wall <NUM> is connected to the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, and the fourth wall <NUM>, to form a first space <NUM>. The first space <NUM> is used to accommodate at least one component in the cell assembly <NUM>, the first circuit board <NUM>, the support <NUM>, and the thermally conductive member <NUM>.

Optionally, the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, the fourth wall <NUM>, and the bottom wall <NUM> may be connected to form the first housing <NUM> by screw locking, welding, or bonding. Optionally, the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, the fourth wall <NUM>, and the bottom wall <NUM> may alternatively be integrally formed, for example, an injection molding process is provided to form an integrally formed structure, for another example, a metal material is extruded to form an integrally formed structure.

Optionally, the first housing <NUM> includes a thermally conductive material, which can improve heat dissipation performance. Optionally, the thermally conductive material includes a thermally conductive metal material and a thermally conductive insulation material, where the insulation material may cover an outer surface of the thermally conductive metal material. Optionally, the thermally conductive metal material of the first housing <NUM> includes aluminum. Optionally, a surface of the first housing <NUM> includes a thermally conductive metal material, which is conducive to improving heat dissipation.

To better illustrate a structure of the battery pack <NUM>, the structure of the battery pack <NUM> will be described in combination with coordinate axes X, Y, and Z. The coordinate axes X, Y, and Z are perpendicular to each other, a direction X is defined as a first direction, a direction Y is defined as a second direction, and a direction Z is defined as a third direction. The first direction X is a direction in which the bottom wall <NUM> and the second housing <NUM> are disposed opposite to each other, the second direction Y is a direction in which the third wall <NUM> and the fourth wall <NUM> disposed opposite to each other, and the third direction Z is a direction in which the first wall <NUM> and the second wall <NUM> disposed opposite to each other. The first direction X is perpendicular to both the second direction Y and the third direction Z.

The battery pack <NUM> further includes a heat sink <NUM>, where the heat sink <NUM> is disposed in the first space <NUM> and located on a side of the support <NUM> facing away from the first circuit board <NUM>. The housing assembly <NUM> is provided with a first pore 10a and a second pore 10b. The first pore 10a and the second pore 10b are connected to the exterior. The heat sink <NUM> is provided with a first channel 60a. The first channel 60a communicates with the first pore 10a and the second pore 10b. The heat sink <NUM> dissipates the heat of the electrode terminal <NUM> from the first pore 10a and the second pore 10b through the first channel 60a to the external environment, further improving heat dissipation of the electrode terminal <NUM> and reducing the temperature of the battery pack <NUM>.

Optionally, heat of the first circuit board <NUM> may alternatively be transferred to the heat sink <NUM> through the thermally conductive member <NUM>, and the heat sink <NUM> may dissipate the heat of the first circuit board <NUM>, further improving heat dissipation of the battery pack <NUM>.

In an embodiment, the battery pack <NUM> may utilize external air to carry away heat of the first circuit board <NUM> and heat of the cell assembly <NUM> through flowing of air. In an embodiment, the battery pack <NUM> may be applied to a device that is in a static state during use, and when the battery pack <NUM> is in a static state, heat dissipation can be implemented through natural wind or an external air-cooling device. In an embodiment, the battery pack <NUM> may be applied to a device that is in a dynamic state during use, for example, a drone or an electric motor bicycle. Because air flow speed is higher during movement of the device, quick heat dissipation for the battery pack <NUM> can be implemented.

In an embodiment, the first pore 10a is provided on the first wall <NUM> and the second pore 10b is provided on the second wall <NUM>. In the third direction Z, the first pore 10a runs through the first wall <NUM> and the second pore 10b runs through the second wall <NUM>. The heat sink <NUM> is connected to inner surfaces of the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, and the fourth wall <NUM>, and the first channel 60a communicates with the first pore 10a and the second pore 10b. When the battery pack <NUM> moves along the third direction Z or a wind direction of the external air-cooling device is the third direction Z, the first pore 10a is an air inlet and the second pore 10b is an air outlet. Air enters the first pore 10a, flows through the first channel 60a, and flows out of the second pore 10b, improving heat dissipation. When the battery pack <NUM> moves along a direction opposite to the third direction Z or a wind direction of the external air-cooling device is a direction opposite to the third direction Z, the first pore 10a is an air outlet and the second pore 10b is an air inlet. Optionally, the first pore 10a may alternatively be provided on the third wall <NUM> and the second pore 10b may alternatively be provided on the fourth wall <NUM>. Optionally, the second pore 10b is provided on the second wall <NUM> and the first pore 10a may alternatively be provided on the third wall <NUM>.

In an embodiment, in the third direction Z, a projection of the first pore 10a overlaps a projection of the second pore 10b. It can be understood that, in the third direction Z, the projection of the first pore 10a partially overlaps the projection of the second pore 10b, the projection of the first pore 10a completely covers the projection of the second pore 10b, or the projection of the second pore 10b completely covers the projection of the first pore 10a. In a specific implementation of this application, in the third direction Z, the projection of the first pore 10a is larger than and covers the projection of the second pore 10b. When the battery pack <NUM> moves along the third direction Z or the wind direction of the external air-cooling device is in the third direction Z, the first pore 10a is an air inlet and the second pore 10b is an air outlet. A pore diameter of the first pore 10a is larger than a pore diameter of the second pore 10b, which enhances airflow convection and further improves heat dissipation.

Refer to <FIG> and <FIG>. In an embodiment, the battery pack <NUM> further includes a second circuit board <NUM>. The second housing <NUM> has a second housing recess 12a, the second circuit board <NUM> is disposed in the second housing recess 12a, and the second circuit board <NUM> and the second housing <NUM> are disposed by insulating from each other. In the first direction X, the heat sink <NUM> is disposed between the first circuit board <NUM> and the second circuit board <NUM>. The second circuit board <NUM> is provided with a first connection portion <NUM> and a second connection portion <NUM>. The first connection portion <NUM> and the second connection portion <NUM> are electrically connected to the first circuit board <NUM>.

In an embodiment, the second circuit board <NUM> includes a BMS (Battery Management System) assembly. The BMS assembly includes a plurality of electronic components, and the plurality of electronic components implement functions such as controlling, protection, communication, power calculation, signal transmission, and electricity transmission for the cell <NUM>. Optionally, the second circuit board <NUM> includes a flexible printed circuit (FPC, Flexible Printed Circuit) board. Optionally, the second circuit board <NUM> includes a printed circuit board (PCB, Printed Circuit Board), and the second circuit board <NUM> is provided with a plurality of wires (not shown in the figure).

In an embodiment, the battery pack <NUM> further includes a connection support <NUM>, where the connection support <NUM> is disposed between the first housing <NUM> and the second housing <NUM>, and the first housing <NUM> and the second housing <NUM> are connected to the connection support <NUM>. The connection support <NUM> is disposed between the second circuit board <NUM> and the heat sink <NUM>, which can reduce a risk of short circuit between the second circuit board <NUM> and the heat sink <NUM>. Optionally, the connection support <NUM> is made of an insulation material.

In an embodiment, a second space <NUM> is formed between the connection support <NUM> and the heat sink <NUM>, the connection support <NUM> is provided with a support through hole <NUM>, and the support through hole <NUM> communicates with the second space <NUM>, which facilitates heat dissipation of the second circuit board <NUM> by the heat sink <NUM>. Heat generated by the second circuit board <NUM> congregates in the second space <NUM>. When heat dissipation is performed in the first channel 60a, the surface temperature of the heat sink <NUM> close to the second circuit board <NUM> is low, and the heat generated by the second circuit board <NUM> is transferred to a surface of the heat sink <NUM>, which can dissipate the heat of the second circuit board <NUM>.

Refer to <FIG>, <FIG>, and <FIG>. In an embodiment, the battery pack <NUM> further includes a first connection member <NUM>. The first connection member <NUM> is connected to the inner surfaces of the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, and the fourth wall <NUM>, and the first connection member <NUM> bonds and connects the cell assembly <NUM>, the first circuit board <NUM>, the support <NUM>, and the heat sink <NUM>, to seal and insulate a space between the cell assembly <NUM> and the heat sink <NUM>. This can reduce a risk of short circuit between the heat sink <NUM> and the electrode terminal <NUM>. When the battery pack <NUM> is subjected to an external impact force, the first connection member <NUM> can improve protection of the battery pack <NUM> and reduce impact of external impurities, for example, water, on the first circuit board <NUM> and the electrode terminal <NUM>.

Optionally, the first connection member <NUM> has higher thermal conductivity, which is conducive to improving heat dissipation of the battery pack <NUM>. The thermal conductivity of the first connection member <NUM> is A, where <NUM> W/(mK) < A ≤ <NUM> W/(mK). The thermal conductivity A satisfies any one of <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), or <NUM> W/(mK).

In an embodiment, the first connection member <NUM> is configured to be formed by providing a flowing first insulation material in the battery pack <NUM> and curing the first insulation material. Optionally, the first connection member <NUM> includes one of a polyurethane adhesive, an epoxy adhesive, and silica gel, which can reduce weight of the first connection member <NUM>. Optionally, the first connection member <NUM> includes a foam adhesive. In an embodiment, the cell assembly <NUM>, the first circuit board <NUM>, the support <NUM>, and the heat sink <NUM> are mounted in the first housing <NUM>, the heat sink <NUM> is connected to the first housing <NUM>, and then the first housing <NUM> is inverted, so that the flowing first insulation material is injected into the battery pack <NUM>. After the inversion, the heat sink <NUM>, the support <NUM>, and the first circuit board <NUM> are disposed sequentially in the first direction. Optionally, the flowing first insulation material is injected into the battery pack <NUM> from the bottom of the cell assembly <NUM> in the first direction X.

Optionally, the viscosity B of the first connection member <NUM> satisfies <NUM> mpa. s ≤ A ≤ <NUM> mpa. s, which is conducive to better filling into gaps between the cell assembly <NUM>, the first circuit board <NUM>, the support <NUM>, and the heat sink <NUM>. For example, the viscosity B satisfies any one of <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, <NUM> mpa. s, or <NUM> mpa.

Refer to <FIG>. The third wall <NUM> has a first region 113a, the first region 113a is provided with a first housing insulation member <NUM>, and the heat sink <NUM> has a first side wall 60b and a second side wall 60c disposed opposite to each other in the second direction Y. The third wall <NUM> is connected to the first side wall 60b, and the first housing insulation member <NUM> is located between the first region 113a and the first side wall 60b. The first housing insulation member <NUM> is disposed in a gap between the first region 113a and the first side wall 60b. This can reduce the first insulation material from flowing in the gap between the first region 113a and the first side wall 60b when the first housing <NUM> is inverted and the first connection member <NUM> is injected. Optionally, the first housing insulation member <NUM> has thermal conductivity and can transfer heat of the heat sink <NUM> to the third wall <NUM>. Optionally, the first housing insulation member <NUM> includes an adhesive. Optionally, the adhesive includes a thermally conductive adhesive. Optionally, thermal conductivity of the thermally conductive adhesive is C, where <NUM> W/(mK) < C ≤ <NUM> W/(mK). The thermal conductivity C satisfies any one of <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), or <NUM> W/(mK). Optionally, the first housing insulation member <NUM> can further prevent external impurities such as water from entering the battery pack <NUM>.

Optionally, the fourth wall <NUM> has a second region (not shown in the figure), and the second region is provided with a second housing insulation member (not shown in the figure). The fourth wall <NUM> is connected to the second side wall 60c, and the second housing insulation member is located between the second region and the second side wall 60c to connect the heat sink <NUM> and the fourth wall <NUM>. The second housing insulation member is disposed in a gap between the second region and the second side wall 60c. This can reduce a flowing insulation material from flowing in the gap between the second region and the second side wall 60c when the first housing <NUM> is inverted and the first connection member <NUM> is injected. Optionally, the second housing insulation member has thermal conductivity and can transfer the heat of the heat sink <NUM> to the fourth wall <NUM>. Optionally, the second housing insulation member includes an adhesive. Optionally, the adhesive includes a thermally conductive adhesive. Optionally, a range of thermal conductivity of the thermally conductive adhesive is C, where <NUM> W/(mK) < C ≤ <NUM> W/(mK). The thermal conductivity C satisfies any one of <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), or <NUM> W/(mK). Optionally, the second housing insulation member can further prevent external impurities such as dust from entering the cell assembly <NUM>.

In an embodiment, the third wall <NUM> is provided with a first connection hole 113b, and the first side wall 60b is provided with a second connection hole <NUM>. The battery pack <NUM> includes a first fastener 113c, and the heat sink <NUM> is fixed to the third wall <NUM> by the first fastener 113c running through the first connection hole 113b and the second connection hole <NUM>.

In an embodiment, the fourth wall <NUM> is provided with a third connection hole 114b, and the second side wall 60c is provided with a fourth connection hole <NUM>. The battery pack <NUM> includes a second fastener 114c, and the heat sink <NUM> is fixed to the fourth wall <NUM> by the second fastener 114c running through the third connection hole 114b and the fourth connection hole <NUM>.

In an embodiment, the first pore 10a and the second pore 10b are provided in plurality and are provided in a same quantity, and the projection of the first pore 10a overlaps the projection of the second pore 10b in the third direction Z. Optionally, the plurality of first pores 10a are spaced apart, and a fifth connection hole <NUM> is provided between adjacent first pores 10a. The heat sink <NUM> includes a third side wall 60d and a fourth side wall 60e disposed opposite to each other in the third direction Z. The third side wall 60d is provided with a sixth connection hole <NUM>. A projection of the fifth connection hole <NUM> overlaps a projection of the sixth connection hole <NUM> in the third direction Z. The battery pack <NUM> includes a third fastener <NUM>. The third fastener <NUM> is disposed between the fifth connection hole <NUM> and the sixth connection hole <NUM> to connect the heat sink <NUM> and the first wall <NUM>.

In an embodiment, the battery pack <NUM> includes a fourth fastener <NUM>. Optionally, the plurality of second pores 10b are spaced apart, a seventh connection hole <NUM> is provided between adjacent second pores 10b, and the fourth side wall 60e is provided with an eighth connection hole <NUM>. A projection of the seventh connection hole <NUM> overlaps a projection of the eighth connection hole <NUM> in the third direction Z. The fourth fastener <NUM> is disposed between the seventh connection hole <NUM> and the eighth connection hole <NUM> to connect the heat sink <NUM> and the second wall <NUM>.

Refer to <FIG>, <FIG>, and <FIG>. In an embodiment, the cell housing <NUM> includes a first part 211a and a second part 211b. The first part 211a is used for accommodating the electrode assembly <NUM>, the second part 211b is connected to the first part 211a, and the electrode terminal <NUM> extends out of the second part 211b. Optionally, the first connection member <NUM> is disposed between the heat sink <NUM> and the cell housing <NUM>, and the first connection member <NUM> covers the first circuit board <NUM>, the support <NUM>, and the part of the electrode terminal <NUM> located outside the cell housing <NUM>.

In an embodiment, the cell housing <NUM> includes a first casing <NUM> and a second casing <NUM>, and the first casing <NUM> is connected to the second casing <NUM>. At least one of the first casing <NUM> and the second casing <NUM> is provided with a first recess 211c, and the electrode assembly <NUM> is disposed in the first recess 211c. The first casing <NUM> and the second casing <NUM> can be folded along a connection position, so that the first casing <NUM> and the second casing <NUM> coincide to form the first part 211a so as to cover the electrode assembly <NUM>. A peripheral side of the first casing <NUM> extends outward to form a plurality of first extension portions <NUM>, and a peripheral side of the second casing <NUM> extends outward to form a plurality of second extension portions <NUM>. After the first casing <NUM> and the second casing <NUM> are folded along the connection position, the first extension portion <NUM> and the second extension portion <NUM> coincide and are hermetically connected to form the second part 211b. Optionally, the first extension portion <NUM> and the second extension portion <NUM> are hermetically connected by a sealant. The second part 211b includes a first sealing portion <NUM> and a second sealing portion <NUM>. The first sealing portion <NUM> is disposed opposite to the connection position, and the electrode terminal <NUM> extends out of the first part 211a from the first sealing portion <NUM>. Optionally, the second part 211b includes two second sealing portions <NUM>, and the two second sealing portions <NUM> are disposed opposite to each other in the second direction Y. Optionally, the second part 211b includes one first sealing portion <NUM>, the cell <NUM> includes two electrode terminals <NUM>, and the two electrode terminals <NUM> extend from the first sealing portion <NUM> out of the cell housing <NUM>. In another embodiment, the first casing <NUM> and the second casing <NUM> are separated. The second part 211b includes two first sealing portions <NUM>, where the two first sealing portions <NUM> are disposed opposite to each other in the first direction X. The cell <NUM> includes two electrode terminals <NUM>, where one electrode terminal <NUM> extends out of the cell housing <NUM> from one first sealing portion <NUM>, and the other electrode terminal <NUM> extends out of the cell housing <NUM> from the other first sealing portion <NUM>. The two electrode terminals <NUM> are disposed opposite to each other in the first direction X.

In an embodiment, the first connection member <NUM> covers a part of the electrode terminal <NUM> extending out of the cell housing <NUM> to strengthen fixation of the electrode terminal <NUM> and improve heat dissipation of the electrode terminal <NUM>.

In an embodiment, the first connection member <NUM> covers the part of the electrode terminal <NUM> extending out of the cell housing <NUM> and at least a part of the first sealing portion <NUM> to strengthen protection of first sealing portion <NUM> and improve heat dissipation of the cell housing <NUM>.

In an embodiment, the electrode assembly <NUM> includes a wound structure formed by winding a positive electrode plate, a negative electrode plate, and a separator. In some other embodiments, the electrode assembly <NUM> may alternatively be a laminated structure. To be specific, a positive electrode plate, a separator, and a negative electrode plate are sequentially laminated to form an electrode assembly unit, and a plurality of electrode assembly units are then laminated to form an electrode assembly <NUM>. Optionally, the cell housing <NUM> includes an aluminum-plastic film. Optionally, the cell <NUM> includes a pouch cell.

In an embodiment, the electrode terminal <NUM> is provided with a welding portion 213a extending out of the cell housing <NUM>, where the welding portion 213a is formed by the electrode terminal <NUM> through bending. Electrode terminals <NUM> of adjacent cells <NUM> are bent toward each other by running through the first circuit board <NUM>, and are connected to the first circuit board <NUM>. In an embodiment, the electrode terminal <NUM> includes a first terminal 213b and a second terminal 213c, and the first terminal 213b and the second terminal 213c have opposite polarities. One of the first terminal 213b and the second terminal 213c is a positive terminal and the other is a negative terminal. In the first direction X, a projection of the welding portion 213a of the first terminal 213b of the cell <NUM> at least partially overlaps a projection of the welding portion 213a of the second terminal 213c of the adjacent cell <NUM>. The first terminal 213b and the second terminal 213c of the adjacent cells <NUM> are bent toward each other, and the welding portion 213a of the first terminal 213b and the welding portion 213a of the second terminal 213c are stacked and connected to each other. The welding portions 213a of the adjacent cells <NUM> are connected to each other, and the welding portions 213a are connected to the first circuit board <NUM>, thereby reducing processing steps.

In another embodiment, in the first direction X, a projection of the first terminal 213b of the cell <NUM> and a projection of the first terminal 213b of the adjacent cell <NUM> may alternatively at least partially overlap, and the two first terminals are connected by the first circuit board <NUM>, so as to realize a parallel connection between the cells <NUM>.

In an embodiment, the cell assembly <NUM> includes a plurality of cells <NUM> stacked in the third direction Z. Optionally, the cell assembly <NUM> includes a plurality of cells <NUM>, where some cells <NUM> are stacked in the third direction Z to form a first column of cells 21a, some cells <NUM> are stacked in the third direction Z to form a second column of cells 21b, and the second column of cells 21b and the first column of cells 21a are arranged in the second direction Y.

In an embodiment, the cell assembly <NUM> includes a plurality of cells <NUM>, and the plurality of cells <NUM> are stacked in the third direction Z.

In an embodiment, the cell <NUM> is in contact connection with the first housing <NUM> to dissipate heat of the cell <NUM> to the external environment through the first housing <NUM>.

Refer to <FIG>. In an embodiment, the cell assembly <NUM> further includes a plurality of heat dissipation portions <NUM>, and the heat dissipation portions <NUM> are in contact connection with the cells <NUM> to dissipate heat of the cells <NUM>. Optionally, the heat dissipation portion <NUM> is in contact connection with the first housing <NUM> to transfer heat of the cell <NUM> to the first housing <NUM>, to dissipate heat of the cell <NUM> through the first housing <NUM>. Optionally, the heat dissipation portion <NUM> includes an aluminum casing.

In an embodiment, a projection of the heat dissipation portion <NUM> and a projection of the cell housing <NUM> overlap in the first direction X, a projection of the heat dissipation portion <NUM> and a projection of the cell housing <NUM> overlap in the second direction Y, and a projection of the heat dissipation portion <NUM> and a projection of the cell housing <NUM> overlap in the third direction Z. This increases a contact area between the heat dissipation portion <NUM> and the cell housing <NUM> and improves heat dissipation efficiency.

In an embodiment, a first elastic member 221a is disposed between adjacent heat dissipation portions <NUM>, and there is a gap between adjacent cells <NUM>, which can increase a width between the adjacent cells <NUM> in the third direction Z, facilitate injection of the first connection member <NUM>, and improve injection efficiency of the first connection member <NUM>. Optionally, the first elastic member 221a includes foam.

Refer to <FIG> and <FIG>. In an embodiment, the first circuit board <NUM> is provided with a plurality of groups of holes <NUM>, and each group of holes <NUM> includes a first hole <NUM> and a second hole <NUM> disposed in the third direction Z. A first terminal 213b of one of adjacent cells <NUM> runs through the first hole <NUM>, and a second terminal 213c of the other cell <NUM> runs through the second hole <NUM>. A welding portion 213a of the first terminal 213b and a welding portion 213a of the second terminal 213c are stacked and connected to the first circuit board <NUM>. Optionally, the first circuit board <NUM> includes a flexible printed circuit (FPC, Flexible Printed Circuit) board. Optionally, the first circuit board <NUM> includes a printed circuit board (PCB, Printed Circuit Board). The first circuit board <NUM> may collect information of the electrode terminal <NUM> and transmit the information to the second circuit board <NUM>, such as voltage, current and other information.

In an embodiment, the first circuit board <NUM> is provided with a plurality of first conductive sheets <NUM>, and the first conductive sheets <NUM> are connected to the first circuit board <NUM>. Optionally, the first conductive sheet <NUM> may be a copper foil disposed on the first circuit board <NUM>, and the copper foil is connected to wiring on the first circuit board <NUM>. Optionally, the first conductive sheet <NUM> may be a conductive sheet disposed on the first circuit board <NUM>, such as a copper bar, where the conductive sheet is welded to the first circuit board <NUM>. Viewed in a direction X' opposite to the first direction, the first conductive sheet <NUM> is located between the first hole <NUM> and the second hole <NUM>, a first terminal 213b of one of adjacent cells <NUM> runs through the first hole <NUM>, and a second terminal 213c of the other cell <NUM> runs through the second hole <NUM>. A welding portion 213a of the first terminal 213b and a welding portion 213a of the second terminal 213c are stacked and welded to the first conductive sheet <NUM>. The first conductive sheet <NUM>, the welding portion 213a of the first terminal 213b, and the welding portion 213a of the second terminal 213c are stacked in the first direction X, and the thermally conductive member <NUM> is connected to a side of the welding portion 213a facing away from the first conductive sheet <NUM>. Welding includes laser welding, ultrasonic welding, and the like. In other embodiments, the welding portion 213a and the first conductive sheet <NUM> may alternatively be connected by other means such as a conductive adhesive.

In an embodiment, each welding portion 213a includes two first ends <NUM> disposed in the second direction Y, and each first conductive sheet <NUM> includes a second end <NUM> disposed in the second direction Y. In the second direction Y, the two first ends <NUM> are located between the two second ends <NUM> when viewed in the direction X' opposite to the first direction X.

In an embodiment, each group of holes <NUM> further includes a third hole <NUM>, where the third hole <NUM> runs through the first circuit board <NUM> in the first direction X. Some of the third holes <NUM> are arranged in the second direction Y, and some of the third holes <NUM> are arranged in the third direction Z. Optionally, at least one third hole <NUM> is configured to allow the first connection member <NUM> to flow between the thermally conductive member <NUM> and the first circuit board <NUM>, and at least a part of the first connection member <NUM> is located in the at least one third hole <NUM>. Optionally, all third holes <NUM> are configured to allow the first connection member <NUM> to flow between the thermally conductive member <NUM> and the first circuit board <NUM>, and at least a part of the first connection member <NUM> is disposed in the third holes <NUM>, thereby improving heat dissipation.

In an embodiment, when viewed in the direction X' opposite to the first direction X, the third hole <NUM> is located in the first opening 40a, and the third hole <NUM> is separated from the first conductive sheet <NUM>, thereby further improving heat dissipation.

In an embodiment, the first circuit board <NUM> is further provided with a second conductive sheet <NUM> and a third conductive sheet <NUM>. In the third direction Z, an electrode terminal <NUM> of one of two outermost cells <NUM> in the first column of cells 21a is connected to the third conductive sheet <NUM>, and an electrode terminal <NUM> of the other cell <NUM> in the two outermost cells <NUM> is connected to the second conductive sheet <NUM>.

In an embodiment, the first circuit board <NUM> is further provided with a fourth conductive sheet <NUM>. In the third direction Z, an electrode terminal <NUM> of one of two outermost cells <NUM> in the second column of cells 21b is connected to the third conductive sheet <NUM>, and an electrode terminal <NUM> of the other cell <NUM> in the two outermost cells <NUM> is connected to the fourth conductive sheet <NUM>. The third conductive sheet <NUM> is connected to the electrode terminals <NUM> of the two cells <NUM> arranged in the second direction Y, and is configured to transfer current from the first column of cells 21a to the second column of cells 21b, so as to realize series connection or parallel connection between the first column of cells 21a and the second column of cells 21b. Optionally, in the first direction X, a thickness of the second conductive sheet <NUM>, a thickness of the third conductive sheet <NUM>, and a thickness of the fourth conductive sheet <NUM> are all greater than a thickness of the first conductive sheet <NUM>. Current transmission can be improved by increasing the thicknesses of the second conductive sheet <NUM>, the third conductive sheet <NUM>, and the fourth conductive sheet <NUM>.

In an embodiment, the first circuit board <NUM> is further provided with a plurality of fourth holes <NUM>, and the fourth holes <NUM> are disposed in the middle of the first circuit board <NUM> in the second direction Y. The battery pack <NUM> further includes a sampling wire harness 100a, and the sampling wire harness 100a is connected to the first circuit board <NUM> through the plurality of fourth holes <NUM>.

In an embodiment, the battery pack <NUM> further includes a first electrical connection portion 100b and a second electrical connection portion 100c. The first electrical connection portion 100b and the second electrical connection portion 100c are for electricity input or output. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c are welded to the first circuit board <NUM>. Optionally, the first electrical connection portion 100b is connected to one of the first terminal 213b and the second terminal 213c, and the second electrical connection portion 100c is connected to the other terminal. Optionally, the first electrical connection portion 100b and the second electrical connection portion 100c include a copper bar.

In an embodiment, the first electrical connection portion 100b includes a first conductive portion <NUM> and a first insulation portion <NUM>. The first insulation portion <NUM> is sleeved on the first conductive portion <NUM>, and both ends of the first conductive portion <NUM> extend out of the first insulation portion <NUM>. Optionally, one end of the first conductive portion <NUM> extending out of the first insulation portion <NUM> is connected to the second conductive sheet <NUM>, and another end runs through the support <NUM> and the heat sink <NUM> and is connected to the first connection portion <NUM> of the second circuit board <NUM>. Optionally, one end of the first conductive portion <NUM> extending out of the first insulation portion <NUM> is directly connected to the first circuit board <NUM>, and another end runs through the support <NUM> and the heat sink <NUM> and is connected to the first connection portion <NUM> of the second circuit board <NUM>.

In an embodiment, the second electrical connection portion 100c includes a second conductive portion <NUM> and a second insulation portion <NUM>. The second insulation portion <NUM> is sleeved on the second conductive portion <NUM>, and both ends of the second conductive portion <NUM> extend out of the second insulation portion <NUM>. Optionally, one end of the second conductive portion <NUM> extending out of the second insulation portion <NUM> is connected to the fourth conductive sheet <NUM>, and another end runs through the support <NUM> and the heat sink <NUM> and is connected to the first connection portion <NUM> of the second circuit board <NUM>. Optionally, one end of the second conductive portion <NUM> extending out of the second insulation portion <NUM> is directly connected to the first circuit board <NUM>, and another end runs through the support <NUM> and the heat sink <NUM> and is connected to the second connection portion <NUM> of the second circuit board <NUM>.

Refer to <FIG>, <FIG>, and <FIG> to <FIG>. In an embodiment, the support <NUM> includes a support body <NUM>, where the support body <NUM> covers a part of the first circuit board <NUM>, insulating the first circuit board <NUM>. The first connection member <NUM> is disposed between the support body <NUM> and the first circuit board <NUM>, and the support <NUM> and the first circuit board <NUM> are connected by the first connection member <NUM>. The first connection member <NUM> can further insulate the first circuit board <NUM>.

Optionally, the support <NUM> is made of an insulation material. Optionally, the support <NUM> is made of a metal material and an insulation material, and the insulation material can cover an outer surface of the metal material.

In an embodiment, in the first direction X, the first opening 40a runs through the support body <NUM>. When viewed in the direction X' opposite to the first direction X, at least a part of the welding portion 213a is exposed from the first opening 40a. The thermally conductive member <NUM> is disposed in the first opening 40a, and a projection of the thermally conductive member <NUM> coincides with a projection of the first opening 40a in the first direction X, and is connected to the welding portion 213a exposed from the first opening 40a. In the first direction X, the first conductive sheet <NUM>, the welding portion 213a, and the thermally conductive member <NUM> are connected in sequence. Optionally, the thermally conductive member <NUM> covers the welding portion 213a exposed from the first opening 40a.

Optionally, at least some of welding portions 213a on a plurality of first conductive sheets <NUM> spaced apart in the third direction Z are exposed from a same first opening 40a when viewed in the direction X' opposite to the first direction X. In the first direction X, the thermally conductive member <NUM> coincides with the first opening 40a and is connected to a plurality of welding portions 213a exposed from the first opening 40a.

Optionally, the support body <NUM> is provided with a plurality of first openings 40a, and the plurality of first openings 40a are spaced apart in the second direction Y. Each first opening 40a is internally provided with a thermally conductive member <NUM>, and each thermally conductive member <NUM> is connected to a side of the welding portion 213a facing away from the first conductive sheet <NUM>.

In an embodiment, in the second direction Y, the first opening 40a includes two first edges <NUM>. When viewed in the direction X' opposite to the first direction X, in the second direction Y, the two first edges <NUM> are located between the two first ends <NUM>, and a side end of the welding portion 213a is away from the first opening 40a, which reduces the possibility that burrs of the welding portion 213a pierce the thermally conductive member <NUM>. When viewed in the direction X' opposite to the first direction X, in the second direction Y, the two first edges <NUM> are located between the two second ends <NUM>, and a side end of the first conductive sheet <NUM> is away from the first opening 40a, reducing the possibility that burrs of the first conductive sheet <NUM> pierce the thermally conductive member <NUM>.

In an embodiment, the thermally conductive member <NUM> includes a first surface 50a and a second surface 50b disposed opposite to each other in the first direction X. The first surface 50a protrudes from the first opening 40a in the direction opposite to the first direction X, which facilitates connection of the first surface 50a with the welding portion 213a. The second surface 50b protrudes from the first opening 40a in the first direction X, which facilitates connection of the second surface 50b with the heat sink <NUM>. The heat of the electrode terminal <NUM> is conducted to the second surface 50b through the first surface 50a, and then is conducted to the heat sink <NUM> through the second surface 50b, which facilitates conduction of the heat of the electrode terminal <NUM>. Optionally, the first surface 50a is in contact connection with the electrode terminal <NUM>, and the second surface 50b is in contact connection with the heat sink <NUM>. Optionally, the first surface 50a is connected to the electrode terminal <NUM> through a thermally conductive adhesive, and the second surface 50b is connected to the heat sink <NUM> through a thermally conductive adhesive. Optionally, the thermally conductive member <NUM> includes a thermally conductive silica gel pad. Optionally, the thermally conductive member <NUM> may be compressed, and the thermally conductive member <NUM> is in a compressed state, which is conducive to further improving heat dissipation.

Optionally, thermal conductivity of the thermally conductive member <NUM> is higher than thermal conductivity of the first connection member <NUM>, improving a thermally conductive effect of the thermally conductive member <NUM>. The thermal conductivity of the thermally conductive member <NUM> is D, where <NUM> W/(mK) ≤ D ≤ <NUM> W/(mK). The thermal conductivity D satisfies any one of <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), <NUM> W/(mK), or <NUM> W/(mK).

In an embodiment, the support <NUM> is provided with a second opening <NUM>, and the second opening <NUM> runs through the support body <NUM> in the first direction X. The first electrical connection portion 100b runs through the second opening <NUM> and extends to a side of the support <NUM> away from the first circuit board <NUM>. Optionally, the support <NUM> is provided with a first bulge <NUM>, and the first bulge <NUM> is disposed at an edge of the second opening <NUM>. The first electrical connection portion 100b is positioned by using the first bulge <NUM>. In the second direction Y, a projection of a part of the first conductive portion <NUM> extending out of the first insulation portion <NUM> falls within a projection of the first bulge <NUM>. The first bulge <NUM> insulates the part of the first conductive portion <NUM> extending out of the first insulation portion <NUM>, thereby reducing a risk of short circuit in the part of the first conductive portion <NUM> extending out of the first insulation portion <NUM>. Optionally, in the second direction Y, a projection of the first insulation portion <NUM> overlaps a projection of the first bulge <NUM>, so as to increase a length of the first bulge <NUM> in the first direction X, thereby further improving insulation of the part of the first conductive portion <NUM> extending out of the first insulation portion <NUM>.

In an embodiment, the support <NUM> is provided with a third opening <NUM>, and the third opening <NUM> runs through the support body <NUM> in the first direction X. The second electrical connection portion 100c runs through the third opening <NUM> and extends to a side of the support <NUM> away from the first circuit board <NUM>. Optionally, the support <NUM> is provided with a second bulge <NUM>, and the second bulge <NUM> is disposed at an edge of the third opening <NUM>. The second electrical connection portion 100c is positioned and insulated by using the second bulge <NUM>. In the second direction Y, a projection of a part of the second conductive portion <NUM> extending out of the second insulation portion <NUM> falls within a projection of the second bulge <NUM>. The second bulge <NUM> insulates the part of the second conductive portion <NUM> extending out of the second insulation portion <NUM>, thereby reducing a risk of short circuit in the part of the second conductive portion <NUM> extending out of the second insulation portion <NUM>. Optionally, in the second direction Y, a projection of the second insulation portion <NUM> overlaps a projection of the second bulge <NUM>, so as to increase a length of the second bulge <NUM> in the first direction X, thereby further improving insulation of the part of the second conductive portion <NUM> extending out of the second insulation portion <NUM>.

In an embodiment, the support <NUM> is provided with a fourth opening <NUM>. The fourth opening <NUM> runs through the support body <NUM> in the first direction X, so that the sampling wire harness 100a can pass through the fourth opening <NUM>. In the second direction Y, the fourth opening <NUM> is located in the middle of the support body <NUM>. In the third direction Z, guide plates <NUM> are disposed on both sides of the fourth opening <NUM>, and the sampling wire harness 100a runs through the fourth opening <NUM> between the two guide plates <NUM>, facilitating positioning and guiding of the sampling wire harness 100a.

Refer to <FIG>, <FIG>, <FIG>, and <FIG> to <FIG>. In an embodiment, the support <NUM> includes a first convex part <NUM>. In the first direction X, the first convex part <NUM> is disposed on a side of the support body <NUM> facing the heat sink <NUM>, and the first convex part <NUM> is connected to the heat sink <NUM>, so that a first gap 40b is provided between the support body <NUM> and the heat sink <NUM>. The first connection member <NUM> is disposed in the first gap 40b to connect the support <NUM> and the heat sink <NUM>, and to seal and insulate a space between the support <NUM> and the heat sink <NUM>.

In an embodiment, the support <NUM> includes a second convex part <NUM>. In the direction opposite to the first direction X, the second convex part <NUM> is disposed on a side of the support body <NUM> facing the first circuit board <NUM>, and the second convex part <NUM> is connected to the first circuit board <NUM>, so that a second gap 40c is provided between the support body <NUM> and the first circuit board <NUM>. The first connection member <NUM> is disposed in the second gap 40c to connect the support <NUM> and the second gap 40c, and to seal and insulate a space between the support <NUM> and the second gap 40c.

In an embodiment, the support <NUM> includes a first through hole <NUM>, and the first through hole <NUM> runs through the support body <NUM> in the first direction X. The first through hole <NUM> is configured to allow the first connection member <NUM> to flow into the first gap 40b, and at least a part of the first connection member <NUM> is disposed in the first through hole <NUM>. Optionally, a plurality of first through holes <NUM> are provided, and the plurality of first through holes <NUM> are disposed in the third direction Z, which is conducive to improving injection efficiency of the first connection member <NUM>. Optionally, at least one first through hole <NUM> is configured to allow the first connection member <NUM> to flow into the first gap 40b, and the first connection member <NUM> is disposed in the at least one first through hole <NUM>. Optionally, the plurality of first through holes <NUM> are configured to allow the first connection member <NUM> to flow into the first gap 40b, and at least a part of the first connection member <NUM> is disposed in the plurality of first through holes <NUM>.

In an embodiment, a part of at least one electrode terminal <NUM> is located in at least one first through hole <NUM> when viewed in the direction X' opposite to the first direction X, further improving heat dissipation of the electrode terminal <NUM>.

In an embodiment, a part of at least one first conductive sheet <NUM> is located in at least one first through hole <NUM> when viewed in the direction X' opposite to the first direction X, further improving heat dissipation of the first conductive sheet <NUM>.

In an embodiment, the support <NUM> includes a plurality of second through holes <NUM>, and the plurality of second through holes <NUM> runs through the support body <NUM> in the first direction X. Optionally, at least one second through hole <NUM> is internally provided with the first connection member <NUM>. Optionally, a plurality of second through holes <NUM> are internally provided with the first connection member <NUM>.

Optionally, in the first direction X, a projection of the second through hole <NUM> overlaps a projection of the second conductive sheet <NUM>. To be specific, when viewed in the direction X' opposite to the first direction X, a part of the second conductive sheet <NUM> is located in the second through hole <NUM>, and the projection of the second through hole <NUM> overlaps a projection of a welding portion 213a of the electrode terminal <NUM> connected to the second conductive sheet <NUM>. In other words, when viewed in the direction X' opposite to the first direction X, a part of the welding portion 213a connected to the second conductive sheet <NUM> is located in the second through hole <NUM>. Heat of the electrode terminal <NUM> connected to the second conductive sheet <NUM> and heat of the second conductive sheet <NUM> are conducted to the heat sink <NUM> through the first connection member <NUM> in the second through hole <NUM>, which facilitates heat dissipation.

Optionally, in the first direction X, a projection of the second through hole <NUM> overlaps a projection of the third conductive sheet <NUM>. To be specific, when viewed in the direction X' opposite to the first direction X, a part of the third conductive sheet <NUM> is located in the second through hole <NUM>, and the projection of the second through hole <NUM> overlaps a projection of a welding portion 213a of the electrode terminal <NUM> connected to the third conductive sheet <NUM>. In other words, when viewed in the direction X' opposite to the first direction X, a part of the welding portion 213a connected to the third conductive sheet <NUM> is located in the second through hole <NUM>. Heat of the electrode terminal <NUM> connected to the third conductive sheet <NUM> and heat of the third conductive sheet <NUM> are conducted to the heat sink <NUM> through the first connection member <NUM> in the second through hole <NUM>, which facilitates heat dissipation.

Optionally, in the first direction X, a projection of the second through hole <NUM> overlaps a projection of the fourth conductive sheet <NUM>. To be specific, when viewed in the direction X' opposite to the first direction X, a part of the fourth conductive sheet <NUM> is located in the second through hole <NUM>, and the projection of the second through hole <NUM> overlaps a projection of a welding portion 213a of the electrode terminal <NUM> connected to the fourth conductive sheet <NUM>. In other words, when viewed in the direction X' opposite to the first direction X, a part of the welding portion 213a connected to the fourth conductive sheet <NUM> is located in the second through hole <NUM>. Heat of the electrode terminal <NUM> connected to the fourth conductive sheet <NUM> and heat of the fourth conductive sheet <NUM> are conducted to the heat sink <NUM> through the first connection member <NUM> in the second through hole <NUM>, which facilitates heat dissipation.

In an embodiment, the support <NUM> includes a third convex part 40d. The support body <NUM> includes a first side <NUM> and a second side <NUM> disposed in the third direction Z. Optionally, the first side <NUM> is provided with the third convex part 40d. In the third direction Z, a projection of the third convex part 40d overlaps a projection of the first circuit board <NUM>, and a position at which the support <NUM> is connected to the first circuit board <NUM> is limited by the third convex part 40d, facilitating assembly. Optionally, in the third direction Z, a projection of the first circuit board <NUM> falls within a projection of the third convex part 40d. Optionally, in the third direction Z, a projection of the third convex part 40d overlaps projections of the cell housing <NUM> and the electrode terminal <NUM>, so that the electrode terminal <NUM> can be insulated. Optionally, in the third direction Z, a projection of the welding portion 213a falls within a projection of the third convex part 40d, further strengthening insulation.

Optionally, the second side <NUM> is provided with a third convex part 40d In the third direction Z, a projection of the third convex part 40d overlaps a projection of the first circuit board <NUM>, and a position at which the support <NUM> is connected to the first circuit board <NUM> is further limited by the third convex part 40d, facilitating assembly. Optionally, in the third direction Z, a projection of the first circuit board <NUM> falls within a projection of the third convex part 40d. Optionally, in the third direction Z, a projection of the third convex part 40d overlaps projections of the cell housing <NUM> and the electrode terminal <NUM>, so that the electrode terminal <NUM> can be further insulated. Optionally, in the third direction Z, a projection of the welding portion 213a falls within a projection of the third convex part 40d, further strengthening insulation.

Refer to <FIG>, <FIG>, <FIG>, and <FIG>. In an embodiment, the heat sink <NUM> has a plurality of first channels 60a, and the plurality of first channels 60a are arranged in the second direction Y. The heat sink <NUM> is provided with a first accommodation space <NUM>. Optionally, one of two outermost first channels 60a provided in the second direction Y communicates with the first accommodation space <NUM>. Optionally, the heat sink <NUM> is provided with a second accommodation space <NUM>, and the second accommodation space <NUM> communicates with the other outermost first channel 60a.

In an embodiment, thermal conductivity of the heat sink <NUM> is higher than that of the thermally conductive member <NUM>, which is conducive to improving heat dissipation of the battery pack <NUM>.

In an embodiment, when the support <NUM> is connected to the heat sink <NUM>, the first bulge <NUM> is disposed in the first accommodation space <NUM>. In the first direction X, a projection of the first bulge <NUM> falls within a projection of the first accommodation space <NUM>. The first electrical connection portion 100b runs through the first accommodation space <NUM>. Optionally, the heat sink <NUM> is provided with a third accommodation space <NUM>, and the sampling wire harness 100a runs through the third accommodation space <NUM>.

In an embodiment, a second insulation member <NUM> is disposed in the first accommodation space <NUM> to seal the first accommodation space <NUM>. The first insulation material can be restricted from flowing out of the first accommodation space <NUM> when the first insulation material is injected. Optionally, the second insulation member <NUM> is configured to be formed by providing a curable second insulation material in the first accommodation space <NUM> and curing the second insulation material. Optionally, the second insulation member <NUM> includes one of a polyurethane adhesive, an epoxy adhesive, and silica gel. Optionally, the second insulation member <NUM> includes a foam adhesive. The first bulge <NUM> is disposed in the first accommodation space <NUM>, which can further restrict flowing of the second insulation material and reduce the second insulation material flowing between the support <NUM> and the first circuit board <NUM> through the second opening <NUM>. In the first direction X, the second insulation member <NUM> protrudes from the heat sink <NUM>.

In an embodiment, a third insulation member <NUM> is disposed in the second accommodation space <NUM> to seal the second accommodation space <NUM>. The first insulation material can be restricted from flowing out of the second accommodation space <NUM> when the first insulation material is injected. Optionally, the third insulation member <NUM> is configured to be formed by fixing a curable third insulation material in the second accommodation space <NUM> and curing the third insulation material. Optionally, the third insulation member <NUM> includes one of a polyurethane adhesive, an epoxy adhesive, and silica gel. Optionally, the third insulation member <NUM> includes a foam adhesive. The second bulge <NUM> is disposed in the second accommodation space <NUM>, which can further restrict flowing of the third insulation material and reduce the third insulation material flowing between the support <NUM> and the first circuit board <NUM> through the third opening <NUM>. In the first direction X, the third insulation member <NUM> protrudes from the heat sink <NUM>.

In an embodiment, a fourth insulation member <NUM> is disposed in the third accommodation space <NUM> to seal the third accommodation space <NUM>. The first insulation material can be restricted from flowing out of the third accommodation space <NUM> when the first insulation material is injected. Optionally, the fourth insulation member <NUM> is configured to be formed by fixing a curable fourth insulation material in the third accommodation space <NUM> and curing the fourth insulation material. Optionally, the fourth insulation member <NUM> includes one of a polyurethane adhesive, an epoxy adhesive, and silica gel. Optionally, the fourth insulation member <NUM> includes a foam adhesive. In the first direction Z, the fourth insulation member <NUM> protrudes from the heat sink <NUM>.

In an embodiment, two outermost first channels 60a provided in the second direction Y are provided with a fourth convex part <NUM>, and the fourth convex part <NUM> is in contact connection with the first bulge <NUM> to position the first bulge <NUM>, so that the first electrical connection portion 100b can be positioned and a space can be reserved, thereby facilitating injection of the second insulation member <NUM>.

In an embodiment, an outer surface of the heat sink <NUM> includes a metal material layer, such as aluminum, which is conducive to heat dissipation. Optionally, the heat sink <NUM> is made of a metal material, and the outer surface of the heat sink <NUM> may be coated with an insulation layer. Optionally, the heat sink <NUM> is made of a metal material, and the outer surface of the heat sink <NUM> includes a metal material layer.

In an embodiment, when pouring the first insulation material upside down, first, the cell <NUM>, the first circuit board <NUM>, the support <NUM>, the thermally conductive member <NUM>, and the heat sink <NUM> are mounted in the first housing <NUM>, and the heat sink <NUM> is connected to the first housing <NUM>. Then, the second insulation material is injected into the first accommodation space <NUM>, the third insulation material is injected into the second accommodation space <NUM>, and the fourth insulation material is injected into the third accommodation space <NUM>. After the second insulation material, the third insulation material, and the fourth insulation material are cured, the heat sink <NUM> is sealed, then the first housing <NUM> is inverted, so that the flowing first insulation material is injected into the battery pack <NUM> from the bottom of the cell assembly <NUM> in the first direction X. After the first insulation material is cured, the first connection member <NUM> is formed, and then the bottom wall <NUM> is fixedly connected to the first wall <NUM>, the second wall <NUM>, the third wall <NUM>, and the fourth wall <NUM>.

Refer to <FIG>. This application further provides an electric device <NUM> using the foregoing battery pack <NUM>. In an embodiment, the electric device <NUM> in this application may be, but is not limited to, a drone, a backup power source, an electric automobile, an electric motorcycle, an electric motor bicycle, an electric tool, or a large household battery.

Claim 1:
A battery pack (<NUM>), comprising:
a housing assembly (<NUM>);
a cell assembly (<NUM>) accommodated in the housing assembly (<NUM>), wherein the cell assembly (<NUM>) comprises a plurality of cells (<NUM>); each cell (<NUM>) comprises a cell housing (<NUM>), an electrode assembly (<NUM>) disposed in the cell housing (<NUM>), and an electrode terminal (<NUM>) connected to the electrode assembly (<NUM>) and extending out of the cell housing (<NUM>);
a first circuit board (<NUM>), wherein the electrode terminal (<NUM>) runs through the first circuit board (<NUM>) and is connected to a side of the first circuit board (<NUM>) facing away from the cell housing (<NUM>);
a support (<NUM>) connected to the first circuit board (<NUM>), wherein the first circuit board (<NUM>) is disposed between the cell housing (<NUM>) and the support (<NUM>), and the support (<NUM>) is provided with a first opening (40a);
a thermally conductive member (<NUM>) having a thermal conductivity ranging from <NUM> W/(mK) to <NUM> W/(mK) disposed in the first opening (40a), wherein the thermally conductive member (<NUM>) is connected to the electrode terminal (<NUM>) of at least one of the plurality of cells; and
characterized in that the cell housing (<NUM>) and the first circuit board (<NUM>) are disposed in a first direction (X), the plurality of cells (<NUM>) are stacked in a third direction (Z) perpendicular to the first direction (X);
the battery pack (<NUM>) further comprising a heat sink (<NUM>), wherein the heat sink (<NUM>) is disposed on a side of the support (<NUM>), the side of the support (<NUM>) being a side facing away from the first circuit board (<NUM>);
the thermally conductive member (<NUM>) comprises a first surface (50a) and a second surface (50b) disposed opposite to each other in the first direction (X), the first surface (50a) is connected to the electrode terminal of at least some of the plurality of cells through (<NUM>) the first opening (40a), and the second surface (50b) is connected to the heat sink (<NUM>).