Battery device

Abstract

The invention provides a battery device, and relates to the technical field of batteries. The battery device comprises a battery assembly and a connecting assembly. The surface of the battery assembly is provided with a sunken part which is sunken towards the center of the battery assembly relative to the surface of the battery assembly; the connecting assembly comprises a cold plate, a flow channel is formed in the cold plate, the cold plate is arranged in the concave part, and the cold plate and the battery assembly are in thermal conduction. Through the arrangement, the heat dissipation efficiency and the heat dissipation effect of the battery device are improved, so that the thermal safety of the battery device is improved, and the service life of the battery device is prolonged.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery device. Background Art

[0002] As battery technology continues to develop, the energy density of battery devices is increasing. During the use of battery devices, the battery devices generate heat, causing the temperature of the battery devices to rise.

[0003] In the related art, a battery device includes a battery and a cold plate, wherein the cold plate is disposed at the bottom of the battery to dissipate heat from the battery.

[0004] However, such a heat dissipation method may easily lead to uneven heat distribution in the battery. Such heat accumulation may easily reduce the thermal safety of the battery device and adversely affect the service life of the battery device. Summary of the Invention

[0005] The present application provides a battery device that can solve the problem of uneven heat distribution in the battery device, thereby improving the thermal safety and service life of the battery device.

[0006] In order to achieve the above objectives, this application adopts the following technical solutions:

[0007] The present application provides a battery device, comprising:

[0008] A battery assembly, wherein a surface of the battery assembly has a recessed portion, the recessed portion being recessed relative to the surface of the battery assembly toward the center of the battery assembly;

[0009] The connecting assembly includes a cold plate having a flow channel therein, the cold plate is arranged in the recessed portion, and the cold plate and the battery assembly are thermally connected.

[0010] As an optional embodiment, the recessed portion extends along the length direction of the battery assembly;

[0011] The cold plate extends along the length direction of the battery assembly to at least one end of the recessed portion.

[0012] As an optional implementation, the orthographic projection of the recessed portion on the surface where the cold plate is located is covered by the cold plate.

[0013] As an optional embodiment, the battery assembly has an explosion-proof valve, which is located in the recessed portion and arranged toward the cold plate.

[0014] As an optional embodiment, the battery assembly comprises a plurality of battery cells, each of which comprises a pole; the connection assembly further comprises an electrical connector; the electrical connector is connected to the pole and is electrically conductive;

[0015] The electrical connector has a sampling circuit, which is electrically connected to the pole and is used to obtain operating information of the battery cell.

[0016] As an optional embodiment, on the battery assembly, the pole is located on the side where the recessed portion is located, and the pole is located around the recessed portion;

[0017] The connecting assembly further includes a support member, which is provided on the battery assembly and located on the side where the pole is located, and the side of the support member facing away from the battery assembly is connected to the electrical connector;

[0018] The support member covers at least a portion of the cold plate and is thermally connected to the cold plate.

[0019] As an optional embodiment, there are multiple battery assemblies, and the multiple battery assemblies are arranged in an array;

[0020] There are multiple cold plates, and the cold plates and the battery assemblies are arranged in a one-to-one correspondence;

[0021] There are multiple electrical connectors, and the electrical connectors and the poles are arranged in a one-to-one correspondence;

[0022] There are multiple support members, and the positions of the support members are corresponding to the positions of the poles.

[0023] As an optional embodiment, the plurality of support members include a first support member and a second support member, the first support member is arranged at the battery assembly at the end of the battery device, and the second support member is arranged at two adjacent battery assemblies.

[0024] As an optional embodiment, the battery device includes a box body, the box body has a receiving cavity, and the battery assembly and the connecting assembly are both located in the receiving cavity;

[0025] The recessed portion faces the top of the accommodating cavity;

[0026] The cold plate and the box are connected along a height direction of the battery assembly.

[0027] As an optional embodiment, the battery assembly includes a plurality of battery cells, and the plurality of battery cells are arranged in sequence along the length direction of the battery assembly;

[0028] The battery cells all have a groove, the grooves of the battery cells are located on the same side of the battery cells, and the grooves are sequentially connected along the length direction of the battery assembly to form the recessed portion.

[0029] The present application provides a battery device comprising a battery assembly and a connection assembly. The battery assembly has a recessed portion on its surface, recessed relative to the surface of the battery assembly and positioned toward the center of the battery assembly. The connection assembly includes a cold plate having a flow channel therein, which is disposed within the recessed portion and thermally conductively connected to the battery assembly. This arrangement improves the heat dissipation efficiency and effectiveness of the battery device, thereby enhancing its thermal safety and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0031] Figure 1 A schematic diagram of the connection between the battery assembly and the connection assembly provided in an embodiment of the present application;

[0032] Figure 2 The structural explosion of the battery device provided in the embodiment of the present application Figure 1 ;

[0033] Figure 3 The structural explosion of the battery device provided in the embodiment of the present application Figure 2 ;

[0034] Figure 4 A schematic diagram of a connection assembly in a battery device provided in an embodiment of the present application;

[0035] Figure 5 This is an exploded view of the structure of the connection assembly in the battery device provided in an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 100-battery device;

[0038] 110-battery assembly;

[0039] 111-depression; 112-explosion-proof valve; 113-battery cell; 114-groove; 115-pole;

[0040] 120-connection component;

[0041] 121-cold plate; 1211-liquid inlet; 1212-liquid outlet;

[0042] 122- electrical connector;

[0043] 123-support member; 1231-first support member; 1232-second support member;

[0044] 130 - box body; 131 - accommodating chamber; 1311 - first chamber; 1312 - second chamber; 132 - beam body; 133 - main body. DETAILED DESCRIPTION

[0045] To make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0046] The present embodiment provides a battery device 100 including a battery assembly 110. During use, the battery assembly 110 generates heat. If this heat cannot be dissipated, it will cause the temperature of the battery device 100 to rise, which will affect the overall performance of the battery device 100 to a certain extent, and may easily cause thermal safety accidents in the battery device 100, thereby reducing the service life of the battery device 100.

[0047] In some embodiments, the surface of the battery assembly 110 has a recessed portion 111, which is recessed relative to the surface of the battery assembly 110 toward the center of the battery assembly 110. The provision of the recessed portion 111 can enhance the structural strength of the battery assembly 110, effectively resisting thermal expansion deformation and external impact of the battery assembly 110, thereby enhancing the safety of the battery device 100 and extending the service life of the battery device 100. However, the structure of such a battery assembly 110 is irregular, and the heat generated by the battery assembly 110 is unevenly distributed. As a result, it is difficult to dissipate heat from the battery device 100, and the probability of thermal safety accidents occurring in the battery device 100 is high, posing a thermal safety hazard.

[0048] In order to solve such problems, the battery device 100 in the embodiment of the present application also includes a connecting component 120, which includes a cold plate 121. The cold plate 121 has a flow channel. The cold plate 121 is arranged in the recessed portion 111, and the cold plate 121 and the battery assembly 110 are thermally conductive. In this way, when the battery device 100 is in use, the cooling medium passes through the cold plate 121, and the cooling medium flows in the flow channel of the cold plate 121, so as to evenly distribute the cooling medium to various parts of the cold plate 121 through the flow channel, so as to exchange heat with the battery assembly 110, achieve rapid cooling of the battery assembly 110, and improve the safety of the battery device 100. The cold plate 121 is located in the recessed portion 111, and dissipates heat from the heat-concentrated area of ​​the battery assembly 110, avoiding the occurrence of excessively high temperatures in some local areas, and further improving the thermal safety of the battery device 100. It is easy to understand that the cold plate 121 is disposed in the recess 111 , and the recess 111 forms an installation space for the cold plate 121 , thereby reducing the space inside the battery device 100 occupied by the cold plate 121 and further improving the energy density of the battery device 100 .

[0049] It should be noted that the cooling medium in the embodiment of the present application can be water, thermal oil, etc., and the embodiment of the present application does not limit this.

[0050] In some embodiments, the surface of the recess 111 may be coated with thermal grease. When the cold plate 121 is located within the recess 111, thermal conductivity is maintained between the cold plate 121, the thermal grease, and the recess 111. The thermal grease fills the space between the cold plate 121 and the recess 111, ensuring a good thermal path between the cold plate 121 and the recess 111. This improves the cooling efficiency and effectiveness of the battery device 100, further enhancing the thermal safety of the battery device 100 and extending the service life of the battery device 100.

[0051] See Figure 2 and Figure 3 , define the height direction of the battery assembly 110 as Z, the length direction of the battery assembly 110 as X, and the width direction of the battery assembly 110 as Y.

[0052] Optionally, the battery device 100 includes a box 130 having a receiving cavity 131 , in which the battery assembly 110 and the connection assembly 120 are both located; the recessed portion 111 faces the top of the receiving cavity 131 ; and the cold plate 121 and the box 130 are connected along the height direction (Z) of the battery assembly 110 .

[0053] Exemplarily, the box body 130 includes a main body 133 and a beam body 132 . The main body 133 encloses a receiving cavity 131 . The beam body 132 is disposed in the receiving cavity 131 . The beam body 132 can divide the receiving cavity 131 into separate chambers, which can be used to install various components of the battery device 100 .

[0054] It should be noted that the number of beam bodies 132 can be one, two or more, and the embodiment of the present application does not limit the number of beam bodies 132.

[0055] When there are multiple beam bodies 132, the multiple beam bodies 132 can be arranged in sequence along the length direction (X) of the battery assembly 110, or arranged in sequence along the width direction (Y) of the battery assembly 110, or a part of the beam bodies 132 can be intersected and installed in the accommodating cavity 131, which is not required.

[0056] See Figure 2 In the embodiment of the present application, there is one beam body 132, which extends along the width direction (Y) of the battery assembly 110, and along the width direction (Y) of the battery assembly 110, the two ends of the beam body 132 are respectively connected to the main body 133, and the beam body 132 divides the accommodating cavity 131 into a first chamber 1311 and a second chamber 1312. The battery assembly 110 can be installed in the first chamber 1311.

[0057] Combine Figure 1 、 Figure 2 and Figure 3 The recessed portion 111 of the battery assembly 110 faces the top of the accommodating cavity 131 , and the cold plate 121 is disposed in the recessed portion 111 of the battery assembly 110 , and the two ends of the cold plate 121 along the length direction (X) of the battery assembly 110 are respectively connected to the beam 132 and the main body 133 . In this way, the connection between the cold plate 121 and the box body 130 forms a limiting effect on the battery assembly 110, thereby reducing the shaking of the battery assembly 110 in the box body 130, improving the structural stability of the battery device 100, and further avoiding the deterioration of the electrical stability of the battery device 100 caused by the shaking of the battery assembly 110. In other words, the working stability of the battery device 100 can be improved and the service life of the battery device 100 can be extended.

[0058] Furthermore, the connection between the cold plate 121 and the housing 130 can also reduce the number of fixing components connecting the cold plate 121 and the battery assembly 110 to the housing 130, respectively. This facilitates assembly of the battery device 100, improves assembly efficiency of the battery device 100, and reduces production costs of the battery device 100. It is easy to understand that as the number of fixing components is reduced, the available space in the accommodating cavity 131 is increased, and the number of battery assemblies 110 that can be accommodated in the accommodating cavity 131 can be increased, thereby improving the energy density and capacity of the battery device 100, making the battery device 100 applicable in a variety of different fields.

[0059] It should be noted that the battery device 100 in the embodiment of the present application can be used in vehicles, aircraft, electronic equipment, energy storage and other fields, and the embodiment of the present application does not limit this.

[0060] Combine Figure 1 、 Figure 2 and Figure 3 In some embodiments, the battery assembly 110 includes a plurality of battery cells 113 , which are arranged sequentially along the length direction (X) of the battery assembly 110 ; each battery cell 113 has a groove 114 , and the groove 114 of each battery cell 113 is located on the same side of each battery cell 113 , and each groove 114 is sequentially connected along the length direction (X) of the battery assembly 110 to form a recessed portion 111 .

[0061] Thus, the interconnected grooves 114 form a continuous recessed portion 111, which serves as a heat dissipation channel, improving the overall heat dissipation efficiency of the battery assembly 110 and preventing heat accumulation. The cold plate 121 is disposed within the recessed portion 111, allowing direct contact between the cold plate 121 and the heat source (battery assembly 110), further enhancing the heat dissipation efficiency and effectiveness of the battery assembly 110, thereby improving the thermal safety of the battery device 100.

[0062] It is easy to understand that during use of the battery assembly 110 , the battery cells 113 will expand and deform. The grooves 114 can also absorb the expansion and deformation of the battery cells 113 and external impact energy to protect the battery cells 113 and further improve the safety of the battery device 100 .

[0063] See Figures 1 to 3 In the embodiment of the present application, the recessed portion 111 extends along the length direction (X) of the battery assembly 110 ; the cold plate 121 extends along the length direction (X) of the battery assembly 110 to at least one end of the recessed portion 111 .

[0064] In this way, the recessed portion 111 acts as a continuous channel along the length (X) of the battery assembly 110. When in contact with the cold plate 121, it forms an efficient heat conduction path, quickly dissipating heat from the battery cells 113 and improving the heat dissipation efficiency and effectiveness of the battery device 100. In this embodiment of the present application, the cold plate 121 and the recessed portion 111 extend in the same direction, preventing the cold plate 121 from occupying additional internal space of the battery device 100 and improving the energy density of the battery device 100. Furthermore, the cooperation between the cold plate 121 and the recessed portion 111 can reduce the temperature gradient of the battery assembly 110 along the length (X), preventing local overheating within the battery device 100. The uniformity of the heat dissipated by the cold plate 121 to the battery assembly 110 is improved, thereby better balancing the temperature of the battery device 100, improving the thermal safety of the battery device 100, and extending the service life of the battery device 100.

[0065] It should be noted that, along the length direction (X) of the battery assembly 110 , the cold plate 121 may extend to one end or two opposite ends of the cold plate 121 , so that the cold plate 121 can adapt to the heat dissipation requirements of different battery assemblies 110 .

[0066] In some embodiments, the cold plate 121 and the recess 111 extend the same length along the width (Y) of the battery assembly 110. Along the length (X) of the battery assembly 110, the cold plate 121 can extend the same length as or longer than the recess 111. This ensures that the orthographic projection of the recess 111 on the surface of the cold plate 121 is covered by the cold plate 121.

[0067] In this way, the cold plate 121 completely covers the projected area of ​​the recessed portion 111, ensuring that the contact area between the recessed portion 111 and the cold plate 121 is maximized, improving the heat conduction efficiency, avoiding the occurrence of local hot spots, and ensuring that the cold plate 121 can evenly dissipate heat from the entire recessed portion 111. Furthermore, when the cold plate 121 covers the projected area of ​​the recessed portion 111, the cold plate 121 can act as a structural reinforcement, compensating for the local strength loss caused by the grooves 114 of the battery cells 113, thereby improving the overall impact resistance of the battery device 100. At the same time, the cold plate 121 can also disperse the expansion stress of the battery cells 113 during charging and discharging, reducing the probability of deformation of the battery assembly 110. In addition, the cold plate 121 covers the recessed portion 111. During the assembly and production process of the battery device 100, the cold plate 121 and the recessed portion 111 cooperate with each other to form an installation and positioning function, thereby improving the assembly efficiency of the battery device 100 and reducing the number of fixing components between the two, helping to achieve a lightweight battery device 100 and reducing the cost of the battery device 100.

[0068] See Figure 3 In some embodiments, the battery assembly 110 has an explosion-proof valve 112. Exemplarily, the explosion-proof valve 112 is provided on the battery cell 113 to release gas in the battery cell 113 to prevent the battery cell 113 from rupturing and / or exploding, thereby delaying thermal runaway of the battery device 100.

[0069] It is easy to understand that when the battery device 100 is in thermal runaway, the explosion-proof valve 112 opens, and the high-temperature liquid and gas in the battery cell 113 erupt, which can easily induce thermal runaway of other battery cells 113 and aggravate the thermal runaway of the battery device 100.

[0070] To address this issue, the explosion-proof valve 112 in the embodiment of the present application is located in the recessed portion 111 and is disposed toward the cold plate 121. As a result, when the explosion-proof valve 112 is opened, the high-temperature gas and / or liquid in the battery cells 113 erupts, directly melting the cold plate 121. If the cold plate 121 is damaged, the cooling medium in the cold plate 121 enters the accommodating cavity 131, quickly filling the accommodating cavity 131 and lowering the temperature of the battery device 100. During this process, the cooling medium can also extinguish the fire in the battery cells 113, thereby reducing the degree of thermal runaway of the battery device 100 and further improving the thermal safety of the battery device 100.

[0071] See Figure 1 、 Figure 3 、 Figure 4 and Figure 5 The battery assembly 110 has multiple battery cells 113, each battery cell 113 has a pole 115; the connection assembly 120 also includes an electrical connector 122; the electrical connector 122 and the pole 115 are connected and electrically conductive; the electrical connector 122 has a sampling circuit, the sampling circuit and the pole 115 are electrically conductive, and are used to obtain working information of the battery cell 113.

[0072] Exemplarily, the electrical connector 122 includes a copper busbar, an aluminum busbar, etc., which is not limited in the embodiment of the present application.

[0073] It should be noted that the electrical connector 122 and the pole 115 are connected and electrically conductive. Furthermore, different battery cells 113 can also be electrically conductive in series or in parallel through the electrical connector 122. This embodiment of the present application does not limit this.

[0074] The electrical connector 122 in the embodiment of the present application is electrically connected to the pole 115 through the sampling line, so as to obtain the working information of the battery cell 113, wherein the working information of the battery cell 113 includes: voltage information, current information, temperature information, etc., which is not limited in the embodiment of the present application.

[0075] In some embodiments, the battery device 100 also includes a battery management control component, and the acquisition line of the electrical connector 122 extends to the battery management control component and is electrically connected to the battery management control component, so that the battery management control component can reasonably regulate the operation of the battery assembly 110 and further improve the operating performance of the battery device 100.

[0076] Exemplarily, the battery management control unit includes a circuit board, a distribution box, etc., which is not required in the embodiments of the present application.

[0077] See Figure 3In some embodiments, on the battery assembly 110, the pole 115 is located on the side where the recessed portion 111 is located, and the pole 115 is located on the peripheral side of the recessed portion 111; the connecting assembly 120 further includes a support member 123, which is disposed on the battery assembly 110 and is located on the side where the pole 115 is located. The side of the support member 123 facing away from the battery assembly 110 is connected to the electrical connector 122, and the support member 123 covers at least a portion of the cold plate 121 and is thermally conductive to the cold plate 121.

[0078] It can be understood that the pole 115 is located on the side where the recessed portion 111 is located, and the cold plate 121 is located in the recessed portion 111. The cold plate 121 can quickly reduce the heat at the pole 115 to prevent the heat of the battery cell 113 from being concentrated on the pole 115, thereby increasing the heat dissipation efficiency and improving safety. Furthermore, the embodiment of the present application improves the assembly efficiency of the battery device 100 by connecting the support member 123 and the electrical connector 122 to provide installation positioning and support for the electrical connector 122. Among them, the support member 123 covers a portion of the cold plate 121 and is thermally conductive with the cold plate 121, further reducing the heat generated by the electrical connector 122 by the cold plate 121, thereby improving the heat dissipation efficiency of the battery device 100.

[0079] Combine Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In some embodiments, there are multiple battery assemblies 110, and the multiple battery assemblies 110 are arranged in an array; there are multiple cold plates 121, and the cold plates 121 and the battery assemblies 110 are arranged in a one-to-one correspondence; there are multiple electrical connectors 122, and the electrical connectors 122 and the poles 115 are arranged in a one-to-one correspondence; there are multiple support members 123, and the positions of the support members 123 are arranged corresponding to the positions of the poles 115.

[0080] In this way, each battery assembly 110 is provided with a corresponding cold plate 121, and each battery assembly 110 dissipates heat through the corresponding cold plate 121. Each cold plate 121 independently dissipates heat from the battery assembly 110, thereby improving the heat dissipation efficiency and safety of the battery device 100. Furthermore, the support member 123 corresponds to the terminal 115, the electrical connector 122 is connected to the support member 123, and the support member 123 and the cold plate 121 are electrically connected, further improving the heat dissipation efficiency and safety of the battery device 100.

[0081] In some embodiments, the plurality of support members 123 include a first support member 1231 and a second support member 1232 . The first support member 1231 is disposed at the battery assembly 110 at the end of the battery device 100 , and the second support member 1232 is disposed at two adjacent battery assemblies 110 .

[0082] For example, see Figure 1 、 Figure 2 and Figure 4 Along the width direction (Y) of the battery assembly 110, the first support member 1231 is disposed on the battery assembly 110 at the end of the battery device 100, and along this direction, the second support member 1232 is disposed between two adjacent battery assemblies 110. In this way, different support members 123 are connected between the electrical connector 122 and the battery assembly 110, thereby improving the assembly efficiency of the battery device 100.

[0083] See Figure 5 The cold plate 121 in the embodiment of the present application has a liquid inlet 1211 and a liquid outlet 1212, and the liquid inlet 1211 and the liquid outlet 1212 are located at the same end of the cold plate 121 to facilitate the connection and installation of the cold plate 121 and the liquid supply component.

[0084] It should be noted that references in this specification to "one embodiment," "an embodiment," "an exemplary embodiment," "some embodiments," and the like indicate that the described embodiment may include a particular feature, structure, or characteristic, but not necessarily every embodiment includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0085] Generally speaking, terms should be understood, at least in part, based on the context in which they are used. For example, as used herein, the term "one or more" can be used to describe any feature, structure, or characteristic in the singular sense, or can be used to describe a combination of features, structures, or characteristics in the plural sense, depending at least in part on the context. Similarly, terms such as "a," "an," or "the" can also be understood to convey either singular or plural usage, depending at least in part on the context.

[0086] It should be readily understood that “on,” “above,” and “over” in this application should be interpreted in the broadest manner, such that “on” means not only “directly on something,” but also includes “on something” with intervening features or layers therebetween, and “above” or “over” includes not only the meaning of “above” or “over,” but also includes “above” or “over” with no intervening features or layers therebetween (i.e., directly on something).

[0087] Additionally, spatially relative terms, such as "below," "beneath," "beneath," "above," and the like, may be used herein for ease of description to describe the relationship of one element or feature to other elements or features as depicted in the figures. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The device may be otherwise oriented (rotated 90° or at other orientations), and the spatially relative descriptors used herein should be interpreted accordingly.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery device, characterized in that: include: A battery assembly (110), wherein a surface of the battery assembly (110) has a recessed portion (111), and the recessed portion (111) is recessed relative to the surface of the battery assembly (110) toward the center of the battery assembly (110); A connecting assembly (120) includes a cold plate (121) having a flow channel therein, the cold plate (121) is arranged in the recessed portion (111), and the cold plate (121) and the battery assembly (110) are thermally conductive.

2. The battery device according to claim 1, wherein: The recessed portion (111) extends along the length direction of the battery assembly (110); The cold plate (121) extends along the length direction of the battery assembly (110) to at least one end of the recessed portion (111).

3. The battery device according to claim 2, characterized in that The orthographic projection of the recessed portion (111) on the surface where the cold plate (121) is located is covered by the cold plate (121).

4. The battery device according to claim 1, wherein: The battery assembly (110) has an explosion-proof valve (112), and the explosion-proof valve (112) is located in the recessed portion (111) and is arranged toward the cold plate (121).

5. The battery device according to any one of claims 1 to 4, characterized in that: The battery assembly (110) comprises a plurality of battery cells (113), each of the battery cells (113) comprising a pole (115); the connection assembly (120) further comprises an electrical connector (122); the electrical connector (122) and the pole (115) are connected and electrically conductive; The electrical connector (122) has a sampling circuit, the sampling circuit is electrically connected to the pole (115), and is used to obtain operating information of the battery cell (113).

6. The battery device according to claim 5, characterized in that On the battery assembly (110), the pole (115) is located on the side where the recessed portion (111) is located, and the pole (115) is located on the peripheral side of the recessed portion (111); The connecting assembly (120) further includes a support member (123), the support member (123) being arranged on the battery assembly (110) and located on the side where the pole (115) is located, and the side of the support member (123) facing away from the battery assembly (110) is connected to the electrical connector (122); The support member (123) covers at least a portion of the cold plate (121) and is thermally conductive with the cold plate (121).

7. The battery device according to claim 6, characterized in that There are multiple battery assemblies (110), and the multiple battery assemblies (110) are arranged in an array; There are multiple cold plates (121), and the cold plates (121) and the battery assemblies (110) are arranged in a one-to-one correspondence; There are a plurality of electrical connectors (122), and the electrical connectors (122) and the poles (115) are arranged in a one-to-one correspondence; There are a plurality of support members (123), and the positions of the support members (123) and the positions of the poles (115) are arranged correspondingly.

8. The battery device according to claim 7, characterized in that The plurality of support members (123) include a first support member (1231) and a second support member (1232), wherein the first support member (1231) is arranged on the battery assembly (110) at the end of the battery device (100), and the second support member (1232) is arranged on two adjacent battery assemblies (110).

9. The battery device according to any one of claims 1 to 4, characterized in that: The device further comprises a box (130), wherein the box (130) has a receiving cavity (131), and the battery assembly (110) and the connection assembly (120) are both located in the receiving cavity (131); The recessed portion (111) faces the top of the accommodating cavity (131); The cold plate (121) and the box (130) are connected along the height direction of the battery assembly (110).

10. The battery device according to any one of claims 1 to 4, characterized in that: The battery assembly (110) includes a plurality of battery cells (113), and the plurality of battery cells (113) are arranged in sequence along the length direction of the battery assembly (110); Each of the battery cells (113) has a groove (114), the groove (114) of each battery cell (113) is located on the same side of each battery cell (113), and the grooves (114) are sequentially connected along the length direction of the battery assembly (110) to form the recessed portion (111).

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