Battery module, energy storage equipment and power utilization device

Abstract

The utility model relates to a battery module, energy storage equipment and a power utilization device, the battery module comprises a battery unit, the battery unit comprises a first battery monomer and a second battery monomer, the first battery monomer and the second battery monomer are arranged in sequence, the first battery monomer comprises a first pole, and the second battery monomer comprises a second pole. The second battery monomer comprises a second pole arranged adjacent to the first pole, and at least one of the first pole and the second pole is of an elliptical structure; the sheet is provided with a first welding part and a second welding part, the first welding part is welded with the first pole column, the second welding part is welded with the second pole column, and current is transmitted between the first pole column and the second pole column through the sheet. And the elliptical long axis of the first pole and / or the second pole is perpendicular to the direction from the first welding part to the second welding part of the bar or is arranged at a preset included angle with the direction from the first welding part to the second welding part of the bar.

Description

Technical Field

[0001] The present application relates to the technical field of secondary batteries, and in particular to a battery module, an energy storage device and an electrical device. Background Art

[0002] Compared with a single battery cell supplying power independently, using multiple battery cells in series to form a battery module as an energy storage unit can obtain the power output of multiple battery cells, thereby meeting the user's needs for high current and long battery life. The series connection of two adjacent battery cells in the battery module realizes current transmission through welding of two adjacent poles and the bar.

[0003] However, the current transmission path from the inside to the outside of the battery cell and the length of the current transmission path between two adjacent battery cells through the bar are currently too long, resulting in a long current transmission time, which can easily cause the temperature rise rate and maximum temperature of the battery cells and structural parts inside the battery cell to be too large, affecting the current flow capacity inside and outside the battery cell. In order to meet the high current flow requirements, thicker bar sheets need to be used, resulting in increased battery module costs. Summary of the invention

[0004] Based on this, it is necessary to provide a battery module, energy storage equipment and power-consuming device to address the problems of poor current carrying capacity of battery cells and high cost of battery modules.

[0005] In a first aspect of the present application, a battery module is provided, comprising:

[0006] A battery unit, wherein the battery unit includes a first battery cell and a second battery cell, the first battery cell and the second battery cell are arranged in sequence, the first battery cell includes a first pole, the second battery cell includes a second pole arranged adjacent to the first pole, and at least one of the first pole and the second pole is set to an elliptical structure; and

[0007] A bar piece is provided with a first welding portion and a second welding portion, the first welding portion is welded to the first pole, and the second welding portion is welded to the second pole, the current is transmitted between the first pole and the second pole through the bar piece, and the major axis of the ellipse of the first pole and / or the second pole is perpendicular to the direction from the first welding portion to the second welding portion of the bar piece or is arranged at a preset angle.

[0008] In the battery module of the above scheme, by arranging the first battery cell and the second battery cell of the battery unit in sequence, and then welding the first welding part of the bar piece to the first pole and the second welding part to the second pole respectively, the bar piece can connect the first battery cell and the second battery cell in series, so that the current of the first battery cell can be transmitted to the second battery cell via the first pole, the bar piece and the second pole, and then output from the second battery cell after merging to increase the output current and meet the power demand; and because at least one of the first pole and the second pole in this scheme is set to be an elliptical shaped structure, and the major axis of the ellipse of the first pole and / or the second pole is perpendicular to the direction from the first welding portion to the second welding portion of the bar piece or is arranged at a preset angle. Therefore, compared with the traditional circular pole, the semicircular arc corresponding to the major axis of the ellipse of the current flowing through the first pole and the second pole can shorten the path length of the current transmitted from the inside to the outside of the battery cell, that is, shorten the current transmission time, thereby reducing the temperature rise rate and maximum temperature of the battery cells and structural parts inside the battery, improving the internal and external current carrying capacity of the battery cell, and at the same time avoiding the use of too thick a bar piece to increase the cost of the battery module.

[0009] The technical solution of this application is further described below:

[0010] In one embodiment, the first pole and the second pole are both elliptical structures, the first welding portion is a first elliptical hole, a first elliptical weld is formed between the first elliptical hole and the first pole; the second welding portion is a second elliptical hole, a second elliptical weld is formed between the second elliptical hole and the second pole. When the current is conducted from the first pole and the second pole to the outside of the battery cell, it can match the conduction speed of the current inside, thereby ensuring the most efficient internal and external current transmission speed, avoiding charge accumulation in the transmission path, and allowing the battery cell to quickly dissipate heat.

[0011] In one embodiment, the long axis of the first elliptical hole coincides with the long axis of the first pole or is arranged in parallel with each other, and the long axis of the second elliptical hole coincides with the long axis of the second pole or is arranged in parallel with each other. This ensures that the current can pass through the semicircular arc corresponding to the long axis of the first pole and the second pole when transmitting inside the battery, and can pass through the semicircular arc corresponding to the long axis of the first elliptical hole and the second elliptical hole when transmitting outside the battery, thereby shortening the current transmission path and improving the current flow capacity.

[0012] In one embodiment, the bar extends along the arrangement direction of the first battery cell and the second battery cell, and the length extension direction of the bar is perpendicular to the long axis direction of the first pole and the second pole, so that the long axis of the first elliptical hole coincides with or is parallel to the long axis of the first pole, and the long axis of the second elliptical hole coincides with or is parallel to the long axis of the second pole, thereby ensuring that the current can flow more effectively through the semicircular arc corresponding to the long axis.

[0013] In one embodiment, the major axis and minor axis of the first pole and the second pole are set to A and B respectively, and when A<4cm, B / A>tan 8°, and when A>4cm, B / A>tan 5°. The first elliptical hole and the second elliptical hole can obtain a more suitable semicircular arc length corresponding to the major axis to meet the different current capacity requirements of batteries of different specifications, and the size of the first elliptical hole and the second elliptical hole can be appropriately proportional to the overall size of the bar sheet to avoid the hole diameter being too large to affect the strength of the bar sheet.

[0014] In one embodiment, the length direction of the first battery cell and the length direction of the second battery cell are consistent with the length direction of the battery module, so as to reduce the space occupied by the battery module in the width direction when installed in the container, and make full use of the space in the depth direction of the container to arrange more battery modules and improve the energy storage capacity of the energy storage device.

[0015] In one embodiment, the battery module further includes a liquid cooling plate, and the battery unit is mounted on the liquid cooling plate and cooperates with the liquid cooling plate for heat transfer. The liquid cooling plate can cool down the battery unit.

[0016] In one embodiment, the liquid cooling plate includes a vertically arranged liquid cooling bottom plate and a liquid cooling vertical plate, the liquid cooling bottom plate and the liquid cooling vertical plate cooperate to form a first accommodating cavity and a second accommodating cavity, the battery unit is provided with two, one of the battery units is installed in the first accommodating cavity, and the other of the battery units is installed in the second accommodating cavity, the heating bottom surface of the battery unit is in heat transfer contact with the liquid cooling bottom plate, and the heating side surface of the battery unit is in heat transfer contact with the liquid cooling vertical plate. The liquid cooling bottom plate can absorb the heat from the heating bottom surface of the battery unit, and at the same time, the liquid cooling vertical plate can synchronously absorb the heat from the heating side surface of the battery unit, so that the liquid cooling plate can absorb more heat from the battery unit within a unit time, so as to further enhance the thermal management efficiency of the battery unit.

[0017] A second aspect of the present application further provides an energy storage device, which includes the battery module as described above.

[0018] In a third aspect of the present application, there is also provided an electrical device, comprising:

[0019] Electricity users; and

[0020] The energy storage device as described above is electrically connected to the electricity user. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] FIG. 1 is a schematic structural diagram of a battery module according to an embodiment.

[0024] FIG. 2 is a partial exploded structural diagram of the battery module in FIG. 1 .

[0025] Figure 3 It is a top view of the structure of Figure 1.

[0026] Figure 4 This is an exploded diagram of the liquid cooling plate and battery unit.

[0027] Figure 5 It is a schematic structural diagram of the major axis and minor axis of the first pole and the second pole.

[0028] Description of reference numerals:

[0029] 100, battery module; 10, battery unit; 11, first battery cell; 11a, first pole; 12, second battery cell; 12a, second pole; 20, bar; 21, first elliptical hole; 22, second elliptical hole; 30, liquid cooling plate; 31, liquid cooling bottom plate; 32, liquid cooling vertical plate; 33, first accommodating cavity; 34, second accommodating cavity. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] See Figures 1 to Figure 4 , a battery module 100 is shown in an embodiment of the present application, including a battery cell 10 and a bar 20. The battery cell 10 is an energy storage unit, which is used to store electrical energy and output electrical energy to an external electrical device when needed. The bar 20 serves as a connector between battery cells and plays a role in connecting battery cells. The battery cell is a basic component of the battery module 100, and the bar 20 connects multiple battery cells together to form the battery module 100.

[0037] Exemplarily, the battery unit 10 includes a first battery cell 11 and a second battery cell 12, which are arranged in sequence. Specifically, in this embodiment, the first battery cell 11 and the second battery cell 12 are both rectangular batteries, and the first battery cell 11 and the second battery cell 12 are arranged in sequence along the length direction of the first battery cell 11.

[0038] Of course, in other optional embodiments, the first battery cell 11 and the second battery cell 12 may also be arranged in sequence along the thickness direction of the first battery cell 11 .

[0039] The first battery cell 11 includes a first pole 11a, and the second battery cell 12 includes a second pole 12a arranged adjacent to the first pole 11a, and at least one of the first pole 11a and the second pole 12a is configured as an elliptical structure. Preferably, in the present application, both the first pole 11a and the second pole 12a are configured as elliptical structures.

[0040] The bar piece 20 is provided with a first welding portion and a second welding portion, the first welding portion is welded to the first pole 11a, and the second welding portion is welded to the second pole 12a, and the current is transmitted between the first pole 11a and the second pole 12a through the bar piece 20, and the major axis of the ellipse of the first pole 11a and / or the second pole 12a is perpendicular to the direction from the first welding portion to the second welding portion of the bar piece 20 or is arranged at a preset angle.

[0041] It should be noted that the above-mentioned preset angle specifically refers to the situation that it may not be vertical, that is, the major axis of the ellipse between the first pole 11a and the second pole 12a and the direction from the first welding part to the second welding part of the 20-bar sheet form an angle of about 80°-100°.

[0042] In summary, the implementation of the technical solution of this embodiment will have the following beneficial effects: in the battery module 100 of the above solution, by arranging the first battery cell 11 and the second battery cell 12 of the battery unit 10 in sequence, the first pole 11a of the first battery cell 11 and the second pole 12a of the second battery cell 12 can be arranged adjacent to each other and spaced apart, and then the first welding portion of the bar piece 20 is welded to the first pole 11a and the second welding portion is welded to the second pole 12a respectively, so that the bar piece 20 can connect the first battery cell 11 and the second battery cell 12 in series, so that the current of the first battery cell 11 can be transmitted to the second battery cell 12 via the first pole 11a, the bar piece 20 and the second pole 12a, and then output from the second battery cell 12 after merging. In order to increase the output current and meet the power demand; and because the first pole 11a and / or the second pole 12a in the present solution are designed as an elliptical structure, and the major axis of the ellipse of the first pole 11a and / or the second pole 12a is perpendicular to the direction from the first welding portion to the second welding portion of the bar 20 or is arranged at a preset angle, compared with the traditional circular pole, the semicircular arc corresponding to the major axis of the ellipse of the current flowing through the first pole 11a and the second pole 12a can shorten the path length of the current transmitted from the inside to the outside of the battery cell, that is, shorten the current transmission time, thereby reducing the temperature rise rate and maximum temperature of the battery cells and structural parts inside the battery, improving the internal and external current carrying capacity of the battery cell, and at the same time avoiding the use of an overly thick bar 20 and causing an increase in the cost of the battery module 100.

[0043] It is necessary to explain that improving the current carrying capacity inside the first battery cell 11 and the second battery cell 12 specifically means that compared with the traditional round pole, after the pole is designed to be elliptical, the welding path between the pins or connecting pieces inside the battery and the pole in the direction of the current carrying cross-sectional area is shortened, so that the current can meet the current carrying requirement by traveling a shorter distance.

[0044] Based on the above embodiment, the first welding portion is set as the first elliptical hole 21, and a first elliptical weld is formed between the first elliptical hole 21 and the first pole 11a; the second welding portion is set as the second elliptical hole 22, and a second elliptical weld is formed between the second elliptical hole 22 and the second pole 12a.

[0045] The first elliptical hole 21 and the first elliptical pole 11a, as well as the second elliptical hole 22 and the second elliptical pole 12a are welded to form a first elliptical weld and a second elliptical weld respectively. On the one hand, this can match the current conduction speed inside the battery cell when the current is conducted from the first pole 11a and the second pole 12a to the outside of the battery cell, thereby ensuring the most efficient internal and external current transmission speed, avoiding charge accumulation in the transmission path, and allowing the battery cell to quickly dissipate heat; on the other hand, it can form a longer connecting weld, increase the welding area between the bar piece 20 and the first pole 11a and the second pole 12a, and improve the connection strength and reliability.

[0046] It is necessary to explain that the first pole 11a and the second pole 12a need to protrude a certain height from the top surface of the first battery cell 11 and the top surface of the second battery cell 12 respectively, so that after the bar 20 is placed on the first pole 11a and the second pole 12a, a safety distance of a certain width is formed between the lower surface and the top surface of the first battery cell 11 and the top surface of the second battery cell 12, thereby avoiding high temperature or laser burns to the first battery cell 11 and the second battery cell 12 during welding.

[0047] In some optional embodiments, the long axis of the first elliptical hole 21 coincides with the long axis of the first pole 11a or is arranged in parallel with each other, and the long axis of the second elliptical hole 22 coincides with the long axis of the second pole 12a or is arranged in parallel with each other. This ensures that the current can pass through the semicircular arc corresponding to the long axis of the first pole 11a and the second pole 12a when transmitting inside the battery, and can pass through the semicircular arc corresponding to the long axis of the first elliptical hole 21 and the second elliptical hole 22 when transmitting outside the battery, thereby shortening the current transmission path and improving the current flow capacity.

[0048] In the present application, the bar sheet 20 is made of aluminum and is also a rectangular sheet structure. The bar sheet 20 extends along the arrangement direction of the first battery cell 11 and the second battery cell 12. The first battery cell 11 and the second battery cell 12 are both rectangular batteries, so the length direction of the bar sheet 20 is consistent with the length direction of the first battery cell 11 and the length direction of the second battery cell 12. In addition, the length extension direction of the bar sheet 20 is perpendicular to the long axis direction of the first pole 11a and the second pole 12a. Thereby, it is possible to ensure that the long axis of the first elliptical hole 21 coincides with or is parallel to the long axis of the first pole 11a, and the long axis of the second elliptical hole 22 coincides with or is parallel to the long axis of the second pole 12a, thereby ensuring that the current can flow more effectively through the semicircular arc corresponding to the long axis.

[0049] It should be noted that if the first battery cell 11 and the second battery cell 12 are arranged in sequence along the length direction of the first battery cell 11, then the above-mentioned arrangement direction refers to the length direction of the first battery cell 11; similarly, if the first battery cell 11 and the second battery cell 12 are arranged in sequence along the thickness direction of the first battery cell 11, then the above-mentioned arrangement direction refers to the thickness direction of the first battery cell 11.

[0050] It is also necessary to explain that the long axis of the above-mentioned first elliptical hole 21 is arranged in parallel with the long axis of the first pole 11a, and the long axis of the second elliptical hole 22 is arranged in parallel with the long axis of the second pole 12a, which means that considering the processing size and installation size errors, the long axis of the first elliptical hole 21 and the long axis of the first pole 11a, as well as the long axis of the second elliptical hole 22 and the long axis of the second pole 12a are misaligned with a certain spacing in the length direction of the battery module 10 (that is, the first battery cell 11 and the second battery cell 12).

[0051] Please continue reading Figure 5 In some optional embodiments, the major axis and minor axis of the first pole 11a and the second pole 12a are set to A and B respectively, wherein when A<4cm, B / A>tan 8°, and when A>4cm, B / A>tan 5°. With such a design, the first elliptical hole 21 and the second elliptical hole 22 can obtain a more suitable semicircular arc length corresponding to the major axis, meeting the different current capacity requirements of batteries of different specifications, and making the size of the first elliptical hole 21 and the second elliptical hole 22 have a suitable ratio corresponding to the overall size of the bar sheet 20, avoiding the hole diameter being too large to affect the strength of the bar sheet 20.

[0052] Please continue to refer to Figure 1 and Figure 4 In the present application, the battery module 100 also includes a liquid cooling plate 30, and the battery unit 10 is mounted on the liquid cooling plate 30 and cooperates with the liquid cooling plate 30 for heat transfer. The length direction of the first battery cell 11 and the length direction of the second battery cell 12 are consistent with the length direction of the battery module 100. That is, during installation, a side with the smallest surface area in the length direction of the first battery cell 11 is docked with a side with the smallest surface area in the length direction of the second battery cell 12, so that the width dimension of the battery module 100 can be reduced, thereby reducing the space occupied in the width direction when installed in the container, and making full use of the space in the depth direction of the container, so as to arrange more battery modules 100 and improve the energy storage capacity of the energy storage device. In addition, it can also ensure that the first battery cell 11 and the second battery cell 12 are in contact with the liquid cooling plate 30 with the side with the largest surface area in the width direction, thereby increasing the heat transfer area and heat transfer efficiency, and strengthening the cooling effect of the liquid cooling plate 30 on the battery unit 10.

[0053] On the basis of the above embodiment, the liquid cooling plate 30 includes a vertically arranged liquid cooling bottom plate 31 and a liquid cooling vertical plate 32. The liquid cooling bottom plate 31 and the liquid cooling vertical plate 32 cooperate to form a first accommodating cavity 33 and a second accommodating cavity 34. There are two battery cells 10, one of which is installed in the first accommodating cavity 33, and the other battery cell 10 is installed in the second accommodating cavity 34. The heating bottom surface of the battery cell 10 is in heat transfer contact with the liquid cooling bottom plate 31, and the heating side surface of the battery cell 10 is in heat transfer contact with the liquid cooling vertical plate 32.

[0054] Therefore, in actual use, the liquid cooling bottom plate 31 can absorb the heat from the heating bottom surface of the battery cell 10, while the liquid cooling vertical plate 32 can simultaneously absorb the heat from the heating side surface of the battery cell 10, so that the liquid cooling plate 30 can absorb more heat from the battery cell 10 within a unit time, so as to further enhance the thermal management performance of the battery cell 10.

[0055] In addition to the above, the present application further provides an electric device, which includes an electric main body and an energy storage device, wherein the energy storage device is electrically connected to the electric main body. The energy storage device includes the battery module 100 as described in any of the above embodiments.

[0056] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, 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 combination of these technical features, they should be considered to be within the scope of this specification.

[0057] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A battery module, characterized in that: include: A battery unit, wherein the battery unit includes a first battery cell and a second battery cell, the first battery cell and the second battery cell are arranged in sequence, the first battery cell includes a first pole, the second battery cell includes a second pole arranged adjacent to the first pole, and at least one of the first pole and the second pole is set to an elliptical structure; and A bar piece is provided with a first welding portion and a second welding portion, the first welding portion is welded to the first pole, and the second welding portion is welded to the second pole, the current is transmitted between the first pole and the second pole through the bar piece, and the major axis of the ellipse of the first pole and / or the second pole is perpendicular to the direction from the first welding portion to the second welding portion of the bar piece or is arranged at a preset angle.

2. The battery module according to claim 1, characterized in that: The first pole and the second pole are both set to elliptical structures, the first welding portion is set to a first elliptical hole, and a first elliptical weld is formed between the first elliptical hole and the first pole; the second welding portion is set to a second elliptical hole, and a second elliptical weld is formed between the second elliptical hole and the second pole.

3. The battery module according to claim 2, characterized in that: The long axis of the first elliptical hole coincides with the long axis of the first pole or is arranged in parallel with each other, and the long axis of the second elliptical hole coincides with the long axis of the second pole or is arranged in parallel with each other.

4. The battery module according to claim 1, characterized in that: The bar piece extends along the arrangement direction of the first battery cell and the second battery cell, and the length extension direction of the bar piece is perpendicular to the long axis direction of the first pole and the second pole.

5. The battery module according to claim 1, characterized in that: The major axis and the minor axis of the first pole and the second pole are set to A and B respectively. When A<4 cm, B / A>tan 8°, and when A>4 cm, B / A>tan 5°.

6. The battery module according to claim 1, characterized in that: The length direction of the first battery cell and the length direction of the second battery cell are consistent with the length direction of the battery module.

7. The battery module according to claim 1, characterized in that: The battery module also includes a liquid cooling plate, and the battery unit is mounted on the liquid cooling plate and cooperates with the liquid cooling plate for heat transfer.

8. The battery module according to claim 7, characterized in that: The liquid cooling plate includes a vertically arranged liquid cooling bottom plate and a liquid cooling vertical plate, the liquid cooling bottom plate and the liquid cooling vertical plate cooperate to form a first accommodating cavity and a second accommodating cavity, the number of battery cells is two, one of the battery cells is installed in the first accommodating cavity, and the other of the battery cells is installed in the second accommodating cavity, the heating bottom surface of the battery cell is in heat transfer contact with the liquid cooling bottom plate, and the heating side surface of the battery cell is in heat transfer contact with the liquid cooling vertical plate.

9. An energy storage device, characterized in that: Comprising the battery module according to any one of claims 1 to 8.

10. An electrical device, characterized in that: include: Electricity users; as well as, The energy storage device as claimed in claim 9, wherein the energy storage device is electrically connected to the electricity user.

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