Patent Description:
Energy storage devices are widely used in the field of new energy. The energy storage device usually needs to be sealed to prevent droplets and dust from invading the interior of the energy storage device and causing short circuit or damage. (see for example <CIT>).

Reference signs: energy storage device <NUM>, electrical module <NUM>, electrical cabinet <NUM>, receiving cavity <NUM>, limiting groove <NUM>, liquid cooling unit <NUM>, controller <NUM>, second liquid cooling connector <NUM>, second electrical connector <NUM>, bolt <NUM>, battery module <NUM>, box <NUM>, accommodation cavity <NUM>, cover plate <NUM>, mounting hole <NUM>, cell <NUM>, second sealing member <NUM>, fixing member <NUM>, first liquid cooling connector <NUM>, first electrical connector <NUM>, copper bar <NUM>, liquid cooling plate <NUM>, positive terminal <NUM>, negative terminal <NUM>, first sealing member <NUM>, positioning pin <NUM>, positioning hole <NUM>.

In order to make the above objects, features and advantages of the present application more obvious and understandable, the specific implementations of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be implemented in many other ways different from those described here. Those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

In the description of the present application, it should be understood that if the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientations or positional relationships indicated by these terms are based on the orientations or positional relationships shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore these terms cannot be construed as a limitation on the present application.

In addition, if the terms "first" and "second" appear, these terms are used for descriptive purposes only and cannot be understood as indicating or implying the relative importance or implicitly indicating the quantity of the indicated technical features. Therefore, features defined as "first" and "second" may explicitly or implicitly include at least one of these features. In the description of the present application, if the term "a plurality of" or "multiple" appears, the meaning of "a plurality of" or "multiple" is at least two, such as two, three, etc., unless otherwise expressly and specifically limited.

In the present application, unless otherwise expressly stated and limited, if the terms "mount", "connect", "couple", "fix", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection, or it can be integrated; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two elements or the interaction between two elements, unless otherwise expressly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

In the present application, unless otherwise explicitly stated and limited, if a first feature is "on" or "below" a second feature or similar descriptions, the meaning may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, the first feature "on", "above" and "over" the second feature may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature has a greater horizontal height than the second feature. The first feature "under", "below" and "beneath" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature has a smaller horizontal height than the second feature.

It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on another element or an intervening element may also be present. If an element is said to be "connected" to another element, it can be directly connected to another element or there may also be an intervening element. If present, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not meant to be exclusive implementation.

For the traditional energy storage devices, the sealing treatment will lead to a complex structure of the energy storage device, thereby increasing the manufacturing cost of the energy storage device.

One technical problem solved by the present application is how to reduce the manufacturing cost of the energy storage device after sealing treatment.

Referring to <FIG>, <FIG> and <FIG>, an energy storage device <NUM> provided in an embodiment of the present application includes an electrical module <NUM>, a battery module <NUM> and a first sealing member <NUM>. The battery module <NUM> can be disposed on the electrical module <NUM> in a stacked manner, and the first sealing member <NUM> is pressed between the electrical module <NUM> and the battery module <NUM>.

Referring to <FIG>, <FIG> and <FIG>, the electrical module <NUM> includes an electrical cabinet <NUM>. The electrical cabinet <NUM> is provided with a receiving cavity <NUM>. The receiving cavity <NUM> is used to accommodate other component(s) of the electrical module <NUM>. The electrical cabinet <NUM> is also provided with a limiting groove <NUM>. The limiting groove <NUM> may be formed by recessing the surface of the electrical cabinet <NUM> to a set depth. The limiting groove <NUM> is arranged around the opening of the receiving cavity <NUM>. The first sealing member <NUM> may be a sealing ring. The first sealing member <NUM> cooperates with the limiting groove <NUM>. The limiting groove <NUM> plays a good positioning role for the first sealing member <NUM> and improves the assembly efficiency and accuracy of the first sealing member <NUM>. The limiting groove <NUM> may also be provided on the battery module <NUM>. When the battery module <NUM> is stacked on the electrical module <NUM>, the battery module <NUM> may cover the receiving cavity <NUM>, so that the first sealing member <NUM> is pressed between the electrical module <NUM> and the battery module <NUM>, and then the first sealing member <NUM> plays a good sealing role on the receiving cavity <NUM>.

If the electrical module and the battery module share one cabinet, the cabinet is separated by a partition to form an electrical compartment and a battery compartment. The electrical module is housed in the electrical compartment, and the battery module is housed in the battery compartment. An electrical cabinet door is used to cap the battery compartment, and a battery cabinet door is used to cap the battery compartment. Therefore, it is necessary to fill a gap between the electrical cabinet door and the cabinet to seal the electrical compartment. It is also necessary to fill a gap between the battery cabinet door and the cabinet to seal the battery compartment. It is also necessary to provide a sealing member on the partition to seal and isolate the electrical compartment and the battery compartment. This will make the sealing structure of the entire energy storage device more complex, thereby increasing the manufacturing cost of the energy storage device after sealing treatment.

For the energy storage device <NUM> in the above embodiment, the battery module <NUM> directly seals the receiving cavity <NUM> of the electrical module <NUM> through the first sealing member <NUM>, so that the battery module <NUM> can serve as a cabinet door for sealing the receiving cavity <NUM> of the electrical module <NUM>, thereby eliminating the need to provide an additional cabinet door on the electrical cabinet <NUM> for sealing the receiving cavity <NUM>. This will simplify the sealing structure of the energy storage device <NUM>, thereby reducing the manufacturing cost of the energy storage device <NUM> after the sealing treatment. It can be understood that by sealing the receiving cavity <NUM>, external dust and liquid droplets can be effectively prevented from entering the receiving cavity <NUM>, thereby avoiding corrosion of component(s) in the receiving cavity <NUM> or causing short circuit.

Referring to <FIG>, in some embodiments, the battery module <NUM> and the electrical module <NUM> may have substantially the same structure. For example, both may be substantially rectangular, and the coverage areas of the two may be substantially the same. When the battery module <NUM> and the electrical module <NUM> are stacked on each other, the outer lateral surfaces of the electrical module <NUM> and the battery module <NUM> may be flush with each other, which can improve the overall consistency of the appearance of the entire energy storage device <NUM>, and also facilitates the installation and transportation of the energy storage device <NUM>. After the battery module <NUM> and the electrical module <NUM> are stacked on each other, the battery module <NUM> and the electrical module <NUM> may be connected through a fastener such as a bolt <NUM> (as shown in <FIG>), so that the battery module <NUM> and the electrical module <NUM> form a detachable connection relationship.

Referring to <FIG>, in some embodiments, for example, the receiving cavity <NUM> of the electrical cabinet <NUM> has two openings, and the two openings are spaced apart along the thickness direction of the electrical cabinet <NUM>. In this case, two battery modules <NUM> need to be provided, and the two battery modules <NUM> are positioned on opposite sides of the electrical cabinet <NUM> in the thickness direction, thereby sealing the two openings of the receiving cavity <NUM>. Therefore, the energy storage device <NUM> includes one electrical module <NUM> and two battery modules <NUM>. For another example, the receiving cavity <NUM> of the electrical cabinet <NUM> has one opening. In this case, only one battery module <NUM> is needed. The opening of the receiving cavity <NUM> is sealed by the battery module <NUM>. Therefore, the energy storage device <NUM> includes one electrical module <NUM> and one battery module <NUM>.

Referring to <FIG>, <FIG> and <FIG>, in some embodiments, the battery module <NUM> includes a box <NUM>, a cover plate <NUM>, a cell <NUM> and a second sealing member <NUM>. An accommodation cavity <NUM> is provided in the box <NUM>. The number of the cell <NUM> may be multiple, and the multiple cells <NUM> may be arranged in a matrix and disposed in the accommodation cavity <NUM>, and all the cells <NUM> are placed bare in the accommodation cavity <NUM>. A positioning groove may be provided on the box <NUM>. The positioning groove may be formed by recessing the surface of the box <NUM> toward the cover plate <NUM> to a set depth. The positioning groove is provided around the opening of the accommodation cavity <NUM>. The second sealing member <NUM> may be a sealing ring. The second sealing member <NUM> cooperates with the positioning groove. The positioning groove plays a good positioning role for the second sealing member <NUM> and improves the assembly efficiency and accuracy of the second sealing member <NUM>. The positioning groove may also be provided on the surface of the cover plate <NUM> facing the box <NUM>. When the battery module <NUM> is placed on the box <NUM>, the cover plate <NUM> covers the accommodation cavity <NUM>, so that the second sealing member <NUM> is pressed between the cover plate <NUM> and the box <NUM>, and then the second sealing member <NUM> has a good sealing effect on the accommodation cavity <NUM>. Through the joint action of the first sealing member <NUM> and the second sealing member <NUM>, the receiving cavity <NUM> of the electrical module <NUM> and the accommodation cavity <NUM> of the battery module <NUM> can be sealed and isolated, thereby eliminating the need for additional sealing members for isolating and sealing the receiving cavity <NUM> and the accommodation cavity <NUM> from each other, thus further simplifying the sealing structure of the energy storage device <NUM> and reducing the manufacturing cost of the energy storage device <NUM> after the sealing treatment. It can be understood that by sealing the accommodation cavity <NUM>, external dust and liquid droplets can be effectively prevented from entering the accommodation cavity <NUM>, thereby avoiding corrosion of the cells <NUM> and other component(s) in the accommodation cavity <NUM> or causing a short circuit. When the battery module <NUM> is stacked on the electrical module <NUM>, the first sealing member <NUM> may be pressed between the cover plate <NUM> of the battery module <NUM> and the electrical cabinet <NUM> of the electrical module <NUM>.

It is assumed that the battery module of the energy storage device adopts a mode including a plurality of battery units, that is, a plurality of battery units are stacked each other to form a battery module. Each battery unit includes a casing, a cover, cells and a sealing member. The number of cells can be multiple. The multiple battery cells are contained in the inner cavity of the casing. The cover is used to cap the inner cavity of the casing. The sealing member is located between the casing and the cover, so that the sealing member seals the inner cavity of the casing. This will cause the battery module to have multiple casings, covers and sealing members, thereby making the structure of the energy storage device <NUM> more complex and increasing the manufacturing cost of the energy storage device.

For the battery module <NUM> in the above embodiment, only one box <NUM>, one cover plate <NUM> and one second sealing member <NUM> are provided, and all cells <NUM> are placed naked in the accommodation cavity <NUM> of the box <NUM>. There is no need to package the cell <NUM> through the casing, the cover and the sealing member to form multiple battery units. It can be understood that all cells <NUM> share one box <NUM>, cover plate <NUM> and second sealing member <NUM>, so that the provision of multiple casings, covers and sealing members for forming the battery units is eliminated. This will simplify the structure of the energy storage device <NUM> and reduce the manufacturing cost of the energy storage device <NUM>.

Referring to <FIG>, <FIG> and <FIG>, in some embodiments, the battery module <NUM> may also include a fixing member <NUM>, a first liquid cooling connector <NUM>, a first electrical connector <NUM>, a copper bar <NUM>, a liquid cooling plate <NUM> and a third sealing member. The fixing member <NUM> may be arranged in the accommodation cavity <NUM>, the liquid cooling plate <NUM> is connected to the box <NUM>, a heat exchange channel is provided in the liquid cooling plate <NUM>, two ends of the heat exchange channel are respectively an inlet and an outlet, and the liquid flows in from the inlet and out from the outlet. The heat generated by the operation of the cell <NUM> can be conducted to the liquid cooling plate <NUM>. When a liquid with lower temperature is introduced into the heat exchange channel, the liquid will absorb the heat conducted to the liquid cooling plate <NUM> in the heat exchange channel, and the liquid absorbing the heat will be discharged from the outlet, so that the liquid can dissipate and cool down the liquid cooling plate <NUM> and the accommodation cavity <NUM>, ensuring that the cell <NUM> works in a reasonable temperature environment and preventing the cell <NUM> from being damaged due to excessive temperature.

The fixing member <NUM> may be a plate-like structure, and the first liquid cooling connector <NUM> and the first electrical connector <NUM> are both arranged on the fixing member <NUM>, so that the fixing member <NUM> serves as a carrier for the first liquid cooling connector <NUM> and the first electrical connector <NUM>. The first liquid cooling connector <NUM> may include a liquid inlet pipe and a liquid outlet pipe. Liquid with a lower temperature enters the heat exchange channel through the liquid inlet pipe and the inlet. After absorbing heat, liquid with a higher temperature will flow into the liquid outlet pipe from the heat exchange channel through the outlet. Referring to <FIG>, the number of copper bars <NUM> may be two. The positive interface of the first electrical connector <NUM> can be electrically connected to the positive terminal <NUM> of the battery module <NUM> through one of the copper bars <NUM>. The negative interface of the first electrical connector <NUM> can be electrically connected to the negative terminal <NUM> of the battery module <NUM> through the other copper bar <NUM>. The positive terminal <NUM> and the negative terminal <NUM> extend in different directions. For example, the positive terminal <NUM> may extend along the width direction of the battery module <NUM>, while the negative terminal <NUM> may extend along the thickness direction of the battery module <NUM>. This will facilitate the layout of the two copper bars <NUM>, thereby simplifying the structure of the battery module <NUM>.

The first liquid cooling connector <NUM> and the first electrical connector <NUM> can both be fixed on a fixing plate through a snap connection, so that the first liquid cooling connector <NUM> and the first electrical connector <NUM> form a quick-plug and quick-change structure, to prevent the first liquid cooling connector <NUM> and the first electrical connector <NUM> from being installed on the fixing member <NUM> through fasteners such as bolts. During the assembly process, the first liquid cooling connector <NUM> and the first electrical connector <NUM> can be assembled by a robot, so that the automated assembly of the battery module <NUM> can be realized, thereby improving the assembly efficiency of the battery module <NUM> and the entire energy storage device <NUM> to reduce the manufacturing cost.

If the battery module still uses a mode in which a plurality of battery units are included, the casing of each battery unit needs to have an input port and an output port for liquid inflow and outflow to dissipate and cool down the cells in the battery unit, this will require the installation of connecting pipes at the input and output ports of each battery unit, thereby increasing the number of connecting pipes used and increasing the manufacturing cost of the energy storage device. Moreover, there are a high-voltage connection line and a low-voltage connection line between two adjacent battery units. The high-voltage connection line and low-voltage connection line are used to electrically connect the two battery units. In view of the large number of high-voltage connection lines and low-voltage connection lines, the manufacturing cost of the energy storage device will be further increased.

For the energy storage device <NUM> in the above embodiment, since all the cells <NUM> in the battery module <NUM> share one liquid cooling plate <NUM>, only one inlet and outlet are provided on the liquid cooling plate <NUM>, thereby reducing the number of connecting pipes used, reducing the probability of failure of the energy storage device <NUM> during manufacturing and operation, thereby reducing the manufacturing cost of the energy storage device <NUM> and improving the stability and reliability of the operation of the energy storage device <NUM>. In addition, all cells <NUM> are placed naked in the accommodation cavity <NUM>, which eliminates the need for providing the high-voltage connection line and the low-voltage connection line between two adjacent cells, thereby further reducing the manufacturing cost of the energy storage device <NUM>.

Referring to <FIG>, <FIG> and <FIG>, in some embodiments, the cover plate <NUM> is provided with a mounting hole <NUM>. The mounting hole <NUM> is a through hole that runs through the entire cover plate <NUM> along the thickness direction of the cover plate <NUM>. The first liquid cooling connector <NUM> is inserted into one of the mounting holes <NUM>, and the first electrical connector <NUM> is inserted into the other mounting hole <NUM>. The third sealing member may be a sealing ring, and the third sealing member is pressed between the cover plate <NUM> and the fixing member <NUM> to seal the mounting hole <NUM>. For example, the number of the third sealing members is two, and one third sealing member is arranged around the first liquid cooling connector <NUM> to seal the mounting hole <NUM> for the first liquid cooling connector <NUM> to pass through, and the other third sealing member is disposed around the first electrical connector <NUM> to seal the mounting hole <NUM> for the first electrical connector <NUM> to pass through.

Referring to <FIG>, <FIG> and <FIG>, in some embodiments, the electrical module <NUM> further includes a liquid cooling unit <NUM>, a controller <NUM>, a second liquid cooling connector <NUM> and a second electrical connector <NUM>. The liquid cooling unit <NUM> and the controller <NUM> may both be located in the receiving cavity <NUM>. The liquid cooling unit <NUM> is connected to the second liquid cooling connector <NUM>, and the second liquid cooling connector <NUM> is connected to the first liquid cooling connector <NUM>, so that the second liquid cooling connector <NUM> is connected between the liquid cooling unit <NUM> and the first liquid cooling connector <NUM>. The liquid with a lower temperature is output through the liquid cooling unit <NUM>, and enters the heat exchange channel of the liquid cooling plate <NUM> from the inlet sequentially through the second liquid cooling connector <NUM> and the first liquid cooling connector <NUM>. After absorbing heat, the liquid with a higher temperature returns to the liquid cooling unit <NUM> from the outlet of the heat exchange channel sequentially through the first liquid cooling connector <NUM> and the second liquid cooling connector <NUM>, thus realizing the heat dissipation of the cell <NUM> by the liquid cooling unit <NUM>. The second electrical connector <NUM> is connected between the controller <NUM> and the first electrical connector <NUM>. Since the first electrical connector <NUM> is electrically connected to the positive and to the negative electrodes of the battery module <NUM> respectively, this allows the controller <NUM> to control the voltage of the battery module <NUM> through the second electrical connector <NUM> and the first electrical connector <NUM>, so that the battery module <NUM> forms high-voltage and low-voltage electrical connections through the controller <NUM>.

In some embodiments, the second liquid cooling connector <NUM> and the second electrical connector <NUM> may both be fixed on the electrical cabinet <NUM> through a snap connection, such that the second liquid cooling connector <NUM> and the second electrical connector <NUM> forms a quick-plug and quick-change structure to prevent the second liquid cooling connector <NUM> and the second electrical connector <NUM> from being installed on the electrical cabinet <NUM> through fasteners such as bolts. During the assembly process, the second liquid cooling connector <NUM> and the second electrical connector <NUM> can be assembled by a robot, so that the automated assembly of the electrical module <NUM> can be realized, thereby improving the assembly efficiency of the electrical module <NUM> and the entire energy storage device <NUM> to reduce the manufacturing cost.

In some embodiments, one of the first liquid cooling connector <NUM> and the second liquid cooling connector <NUM> is a connecting plug and the other is a connecting socket. Through the assembly manner of the connecting plug and the connecting socket, the assembly efficiency between the first liquid cooling connector <NUM> and the second liquid cooling connector <NUM> can be improved, and it also enables the first liquid cooling connector <NUM> and the second liquid cooling connector <NUM> to form a detachable connection relationship. Similarly, one of the first electrical connector <NUM> and the second electrical connector <NUM> is a connecting plug and the other is a connecting socket. Through the assembly manner of the connecting plug and the connecting socket, the assembly efficiency between the first electrical connector <NUM> and the second electrical connector <NUM> can be improved, and it also enables the first electrical connector <NUM> and the second electrical connector <NUM> to form a detachable connection relationship. In view of the improved assembly efficiency between the first liquid cooling connector <NUM> and the second liquid cooling connector <NUM> and between the first electrical connector <NUM> and the second electrical connector <NUM>, the assembly efficiency of the energy storage device <NUM> can also be improved so as to reduce the manufacturing cost.

Referring to <FIG>, in some embodiments, for the electrical cabinet <NUM> on the electrical module <NUM> and the box <NUM> on the battery module <NUM>, one of the electrical cabinet <NUM> and the box <NUM> may be provided with a positioning hole <NUM> and the other one may be provided with a positioning pin <NUM>. For example, the electrical cabinet <NUM> may be provided with a positioning hole <NUM>, and the box <NUM> may be provided with a positioning pin <NUM>. For another example, the electrical cabinet <NUM> may be provided with a positioning pin <NUM>, and the box <NUM> may be provided with a positioning hole <NUM>. During the assembly process of the electrical module <NUM> and the battery module <NUM>, through the cooperation between the positioning hole <NUM> and the positioning pin <NUM>, the assembly efficiency and assembly accuracy of the electrical module <NUM> and the battery module <NUM> can be improved.

Each of the battery modules further includes a third sealing member. The cover plate is provided with a mounting hole for insertion of the first liquid cooling connector and the first electrical connector. The third sealing member is pressed between the cover plate and the fixing member to seal the mounting hole.

The first liquid cooling connector and the first electrical connector are both snap-connected to the fixing member.

Each of the battery modules further includes a connecting copper bar. The first electrical connector is electrically connected respectively to a positive terminal and to a negative terminal of the battery module through the connecting copper bar. The positive terminal extends along a width direction of the battery module. The negative terminal extends along a thickness direction of the battery module.

The electrical module further includes a liquid cooling unit, a controller, a second liquid cooling connector and a second electrical connector. The liquid cooling unit and the controller are located in the receiving cavity. The second liquid cooling connector and the second electrical connector are both arranged on the electrical cabinet through a snap connection, the second liquid cooling connector is connected between the liquid cooling unit and the first liquid cooling connector, and the second electrical connector is connected between the controller and the first electrical connector.

One of the first liquid cooling connector and the second liquid cooling connector is a connecting plug and the other is a connecting socket; one of the first electrical connector and the second electrical connector is a connecting plug and the other is a connecting socket.

The first sealing member is pressed between the cover plate and the electrical cabinet.

Outer lateral surfaces of the electrical module and the battery modules are flush with each other.

The electrical cabinet is recessed and provided with a limiting groove arranged around the receiving cavity, and the first sealing member cooperates with the limiting groove.

At least one of following solutions are also included:.

One technical effect of the present application is: the battery module is disposed on the electrical module and covers the receiving cavity, and the first sealing member is pressed between the battery module and the electrical module to seal the receiving cavity, that is, the battery module directly seals the receiving cavity of the electrical module through the first sealing member, so that the battery module can serve as a cabinet door for sealing the receiving cavity of the electrical module, thereby eliminating the need for providing an additional cabinet door on the electrical cabinet for sealing the receiving cavity, which simplifies the sealing structure of the energy storage device, thereby reducing the manufacturing cost of the energy storage device after sealing treatment.

All cells are placed bare in the accommodation cavity and share the liquid cooling plate, thus reducing the number of connecting pipes used and reducing the probability of failure of the energy storage device during manufacturing and operation, thereby reducing the manufacturing cost of the energy storage device and improving the stability and reliability of the operation of the device energy storage. In addition, it is possible to eliminate the need for providing the high-voltage connection line and the low-voltage connection line between two adjacent cells, thereby further reducing the manufacturing cost of the energy storage device.

The technical features of the above-described embodiments can be combined in any way. To simplify the description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combinations of these technical features, all the combinations should be considered to be within the scope of the present specification.

Claim 1:
An energy storage device (<NUM>), comprising:
an electrical module (<NUM>), wherein the electrical module (<NUM>) comprises an electrical cabinet (<NUM>) provided with a receiving cavity (<NUM>);
battery modules (<NUM>), wherein a number of the battery modules (<NUM>) is two, the electrical module (<NUM>) is sandwiched between the two battery modules (<NUM>), and the two battery modules (<NUM>) respectively cover both ends of the receiving cavity (<NUM>); and
first sealing members (<NUM>), wherein the first sealing members (<NUM>) are arranged around the receiving cavity (<NUM>), and the first sealing members (<NUM>) are respectively pressed between the battery modules (<NUM>) and the electrical module (<NUM>) to seal the receiving cavity (<NUM>);
wherein each of the battery modules (<NUM>) comprises a box (<NUM>), a cover plate (<NUM>), a cell (<NUM>) and a second sealing member (<NUM>), the box (<NUM>) is provided with an accommodation cavity (<NUM>), the cell (<NUM>) is accommodated in the accommodation cavity (<NUM>), the cover plate (<NUM>) is provided on the box (<NUM>) and caps the accommodation cavity (<NUM>), the second sealing member (<NUM>) is arranged around the accommodation cavity (<NUM>), and the second sealing member (<NUM>) is pressed between the cover plate (<NUM>) and the box (<NUM>) to seal the accommodation cavity (<NUM>);
each of the battery modules (<NUM>) further comprises a liquid cooling plate (<NUM>) connected to the box (<NUM>) and used to cool down the cells (<NUM>), and the cell (<NUM>) is placed naked in the accommodation cavity (<NUM>) and share the liquid cooling plate (<NUM>);
each of the battery modules (<NUM>) further comprises a fixing member (<NUM>), a first liquid cooling connector (<NUM>) and a first electrical connector (<NUM>), the fixing member (<NUM>) is connected to the box (<NUM>) and is located in the accommodation cavity (<NUM>), the first liquid cooling connector (<NUM>) and the first electrical connector (<NUM>) are both arranged on the fixing member (<NUM>), the first liquid cooling connector (<NUM>) is connected to the liquid cooling plate (<NUM>) and the electrical module (<NUM>), and the first electrical connector (<NUM>) is electrically connected to an electrode of the battery module (<NUM>) and to the electrical module (<NUM>).