Battery pack structure and energy storage device

Abstract

The utility model provides a battery pack structure and an energy storage device. The battery pack structure comprises a battery cell unit, a cold plate, a bottom shell and an end plate, wherein the plurality of battery cell units are configured to be densely arranged in a matrix shape; the cold plate is arranged between two adjacent battery cell units and is attached to the battery cell units; the bottom shell is attached to the bottoms of the battery cell unit and the cold plate; an anti-explosion valve is arranged at the bottom of the battery cell unit, the weak part or the exhaust port / channel of the bottom shell is opposite to the anti-explosion valve, and gas exhausted by the anti-explosion valve can be guided to the outside; and the end plate is connected with the cold plate and forms a module with the battery cell unit. The utility model can realize thermoelectric separation of the battery pack, and has the advantage of high electrical safety.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, in particular to a battery pack structure. The utility model also relates to an energy storage device comprising the above battery pack structure. Background Art

[0002] CTP (Cell To Pack) is a battery pack design strategy and manufacturing process that directly integrates cell units into the battery pack. Since the module-level structure is removed in the process of directly going from cells to the battery pack, while simplifying the overall structure and installation steps, more internal space of the battery pack is saved for the arrangement of cells. The battery pack adopting CTP technology has lower production cost and higher energy density, and performs better in actual use.

[0003] With the development of the fast charge and discharge technology of battery packs and the further improvement of energy density, the battery packs adopting CTP technology have higher and higher requirements for electrical safety. In order to avoid explosion due to overheating of the cells, one or more explosion-proof valves are usually provided for the existing battery pack cells. When the cells are in a thermal runaway state, the explosion-proof valves open and discharge the high-temperature gas inside the cells. However, during the process of the explosion-proof valves exhausting gas, the control system of the battery pack will continue to heat up, and then the battery pack management system fails. This phenomenon affects the electrical safety of the battery pack.

[0004] It can be known from the above background art that the management system of the existing battery pack is prone to failure due to the exhaust of the explosion-proof valves of the cells inside it, and there is a problem of poor electrical safety. Summary of the Utility Model

[0005] In view of this, the utility model aims to provide a battery pack structure, which can achieve thermoelectric separation, is beneficial to avoiding the failure of the battery pack management system during the exhaust process of the explosion-proof valves, and effectively improves the electrical safety of the battery pack.

[0006] To achieve the above object, the technical solution of the utility model is realized as follows:

[0007] A battery pack structure of the utility model includes cell units, which are constructed as a plurality of densely arranged in a matrix.

[0008] A cold plate is arranged between two adjacent cell units and is attached to the cell units.

[0009] A bottom shell is attached to the bottom of the cell units and the cold plate.

[0010] An explosion-proof valve is provided at the bottom of the cell unit, and a weak part or an exhaust port / channel of the bottom shell is arranged opposite to the explosion-proof valve, and can guide the gas discharged by the explosion-proof valve to the outside.

[0011] The end plate is connected to the cold plate and forms a module with the battery cell unit.

[0012] Furthermore, a terminal is provided at the top of the battery cell unit.

[0013] Furthermore, a limiting groove is formed in the side wall of the battery cell unit. The limiting groove is oval-shaped, and a glue-blocking foam is provided in the limiting groove.

[0014] Furthermore, the cold plate includes a flow channel plate which is arranged between two adjacent battery cell units in the vertical direction and is in contact with the battery cell units.

[0015] The flow guide pipes are arranged at both ends of the flow channel plate and are internally communicated with the flow channel plate.

[0016] Furthermore, the flow guide pipes on the same side of the flow channel plate are configured as a plurality of pipes uniformly arranged along the height direction. All the flow guide pipes are internally communicated with the flow channel plate, and / or

[0017] The cold plate further includes a baffle which is symmetrically distributed on the upper and lower sides of the flow channel plate and is perpendicular to the plane where the flow channel plate is located.

[0018] Furthermore, a gap of 5 mm to 10 mm is reserved between the edge of the limiting groove and the periphery of the battery cell unit.

[0019] Furthermore, the bottom case includes a bottom plate which is arranged to fit the bottoms of the battery cell unit and the cold plate.

[0020] The side plates are vertically arranged at the edges of the upper surface of the bottom plate and are communicated with the bottom plate.

[0021] A plurality of through holes are formed in the bottom plate, and the through holes are configured to correspond to the explosion-proof valves one by one.

[0022] Furthermore, extension parts are formed by extending the two side edges of the bottom plate perpendicular to the length direction of the cold plate towards the outside.

[0023] Furthermore, a buffer member is arranged to fit the inner wall of the side plate.

[0024] Compared with the prior art, the present utility model has the following advantages:

[0025] During the normal operation of the battery pack structure described in the present utility model, the battery cell unit plays a role in energy storage, enabling the battery pack structure in this embodiment to have the functions of charging and discharging. The cold plate is arranged between two adjacent rows of battery cell units and can serve as a channel for the flow of the cooling medium, transferring the heat generated by the battery cell units to the outside in the form of heat convection, so as to maintain the working environment temperature of the battery cell units within a suitable range, which is beneficial to improving the charge and discharge cycle times and the endurance performance of the battery cell units. When thermal runaway occurs in the battery pack, the high-temperature gas generated by the explosion-proof valve will flow into the inner part of the bottom case. After being guided and cooled by the bottom case, it is discharged to the outside of the battery pack, thus avoiding affecting the battery pack management system and achieving the invention purpose of improving the electrical safety of the battery pack.

[0026] In addition, by arranging the pole column at the top of the battery cell unit opposite to the explosion-proof valve, the influence of the high-temperature gas generated by the explosion-proof valve on the pole column is further reduced, which is beneficial to avoiding the phenomenon of heat accumulation and temperature rise of the pole column due to the exhaust of the explosion-proof valve, and improving the electrical safety of the battery cell unit.

[0027] By arranging a limiting groove on the side wall of the battery cell unit, it can provide a limit for the installation of the glue-blocking foam. By setting the shapes of the limiting groove and the glue-blocking foam to be oval, and further setting a gap of 5 mm to 10 mm between the limiting groove and the edge of the battery cell unit, compared with the rectangular glue-blocking foam in the prior art, it is not easy to have the phenomenon of glue opening at the four corners of the glue-blocking foam in the prior art, and has better bonding strength. Through the setting of the glue-blocking foam, it can play a role in limiting the thermal conductive structural glue between the battery cell unit and the cold plate, which is beneficial to avoiding the problem of the decrease in the charge and discharge cycle times of the battery cell caused by the excessive overflow area of the thermal conductive structural glue. By adopting the window bonding method between the battery cell unit and the cold plate, the mode of the battery pack is improved, and structures such as steel tie straps used for putting the battery cell into the box in the prior art are omitted. While ensuring the structural strength and position stability, the utilization rate of the internal space of the battery pack is improved.

[0028] Secondly, by arranging a flow channel plate between two adjacent battery cell units, the cooling medium can transfer the heat generated by the battery cell units to the outside through heat exchange during the process of flowing along the flow channel plate. By arranging diversion pipes at both ends of the flow channel plate, it can facilitate the formation of a connection structure between the flow channel plate and the cooling medium circulation system, which is convenient for installation and maintenance.

[0029] By arranging a plurality of mutually parallel diversion pipes on the same side of the flow channel plate, the flow velocity of the heat-conducting medium in the flow channel plate can be increased, thereby improving the heat dissipation efficiency of the cold plate and keeping the environmental temperature inside the battery pack within a suitable range.

[0030] Furthermore, by setting the bottom case into a structure of a hollow bottom plate and side plates that are interconnected, while realizing the basic function of the bottom case to support and limit the battery cell unit and the cold plate, through holes corresponding to the explosion-proof valves one by one are opened on the bottom plate. When thermal runaway occurs in the battery cell unit, the high-temperature gas discharged can directly enter the bottom plate through the through holes. The bottom plate plays a role in cooling and guiding the high-temperature gas, and can be discharged to the outside of the battery pack after secondary cooling through the side plates. Thus, it is beneficial to avoid the influence of the explosion-proof valve exhausting on the internal electrical connection structure and the battery pack management system, and achieve the invention purpose of thermoelectric separation and improving the electrical safety of the battery pack.

[0031] By providing extension parts on two sides of the bottom plate perpendicular to the length direction of the cold plate, space can be reserved for the connection structure between the cold plate and the external cooling medium circulation system, simplifying the connection steps of the cold plate and making the installation process easy to operate.

[0032] By providing buffer parts on the inner wall of the side plates, a compression gap can be provided for the process of installing the large module composed of the battery cell unit and the cold plate into the box, and during subsequent use, a certain margin can be left for the expansion and deformation of the battery cell unit, thereby reducing the influence of the expansion force of the battery cell on the service life of the battery cell unit and increasing the number of charge and discharge cycles. In addition, the setting of the buffer parts can improve the overall structural strength of the battery pack.

[0033] In addition, the present utility model also proposes an energy storage device provided with the above battery pack structure.

[0034] The energy storage device described in the present utility model has the same beneficial effects as the above-mentioned battery pack structure compared with the prior art, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The drawings constituting a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0036] Figure 1 is an exploded structural schematic diagram of the battery pack structure in the embodiment of the present utility model;

[0037] Figure 2 is a top view of the battery cell unit in the embodiment of the present utility model;

[0038] Figure 3 is a bottom view of the battery cell unit in the embodiment of the present utility model

[0039] Figure 4 is a partial enlarged view of the battery cell unit and the cold plate in the embodiment of the present utility model;

[0040] Figure 5This is a schematic structural diagram of the bottom case in an embodiment of the present utility model.

[0041] Explanation of reference numerals in the drawings:

[0042] 1. Battery cell unit;

[0043] 101. Explosion-proof valve; 102. Terminal post; 103. Limit groove; 104. Glue-blocking foam;

[0044] 2. Cold plate;

[0045] 201. Flow channel plate; 202. Diversion pipe; 203. Baffle edge;

[0046] 3. Bottom case;

[0047] 301. Bottom plate; 302. Side plate; 303. Through hole; 304. Extension part; 305. Buffer member;

[0048] 4. End plate. Detailed implementation manners

[0049] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other. To more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will describe the specific implementation manners of the present utility model with reference to the drawings. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings, and other implementation manners can also be obtained.

[0050] In the description of the present utility model, it should be noted that if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "outer", etc. appear, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model. In addition, if terms such as "first", "second", etc. appear, they are also only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0051] Taking a battery pack structure and an energy storage device described in the present utility model as an example, the orientation words such as "up, down, left, right, front, and back" used in the embodiments are defined based on the up-down direction (also known as the height direction or the Z direction of the battery pack), the left-right direction (also known as the width direction or the Y direction of the battery pack), and the front-back direction (also known as the length direction or the X direction of the battery pack) of the battery pack. "Inside and outside" are defined based on the outline of the corresponding components. For example, "inside" and "outside" defined based on the outline of the battery pack, the side closer to the middle of the battery pack is "inside", and vice versa is "outside".

[0052] In addition, in the description of the present utility model, unless otherwise clearly defined, the terms "installation", "connection", "connection", and "connection components" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood in combination with specific situations.

[0053] The following will refer to the attached Figure 1 to the attached Figure 5 and in combination with the embodiments to elaborate on the present utility model in detail.

[0054] Embodiment 1

[0055] This embodiment relates to a battery pack structure, which integrates a structure for cooling and exhaust on the bottom shell and is directly opposite to the explosion-proof valve of the battery cell. After the battery cell undergoes thermal runaway, the high-temperature gas generated by the explosion-proof valve can be directly cooled by the bottom shell and guided to be discharged to the outside of the battery pack, thereby achieving the invention purpose of improving the electrical safety of the battery pack.

[0056] In terms of the overall structure, referring to Figure 1 、 Figure 2 and Figure 3 , the battery pack structure of this embodiment includes a battery cell unit 1, a cold plate 2, a bottom shell 3, and an end plate 4. Among them, the number of battery cell units 1 is set to be multiple, and the battery cell units 1 are configured to be densely arranged in a matrix. The number of cold plates 2 is set to be multiple. The cold plates 2 are arranged between two adjacent battery cell units 1 and are attached to the two adjacent rows of battery cell units 1 and are bonded and fixed through a thermally conductive structural adhesive. The bottom shell 3 is arranged at the bottom of the multiple battery cell units 1 and the multiple cold plates 2 and is attached to all the battery cell units 1 and cold plates 2. An explosion-proof valve 101 is arranged at the bottom of the battery cell unit 1. The bottom shell 3 is a hollow structure, and the weak part or exhaust port / channel of the bottom shell 3 is arranged opposite to the explosion-proof valve 101. The end plate 4 is connected to the cold plate and forms a module with the multiple battery cell units 1 and is put into the box together in the form of a large module.

[0057] With the above settings, during the normal operation of the battery pack, the battery cell unit 1 plays the role of energy storage, enabling the battery pack structure in this embodiment to have the functions of charging and discharging. The cold plate 2 is arranged between two adjacent rows of battery cell units 1 and can serve as a channel for the flow of the cooling medium, transferring the heat generated by the battery cell unit 1 to the outside in the form of heat convection, so as to keep the working environment temperature of the battery cell unit 1 within a suitable range, which is beneficial to improving the charge and discharge cycle times and the endurance performance of the battery cell unit 1. When thermal runaway occurs in the battery pack, the high-temperature gas generated by the explosion-proof valve 101 will flow into the bottom case 3. After being guided and cooled by the bottom case 3, it is discharged to the outside of the battery pack, thus avoiding affecting the battery pack management system and achieving the invention purpose of improving the electrical safety of the battery pack.

[0058] Based on the above design concept, specifically, in this embodiment, referring to Figure 2 and Figure 3 , a terminal post 102 is arranged at the top of the battery cell unit 1. The terminal post 102 can be made of copper alloy with good electrical conductivity. The cross-section of the terminal post 102 is rectangular. The number of terminal posts 102 is two. The two terminal posts 102 are symmetrically arranged about the midline of the top of the battery cell unit 1. The two terminal posts 102 respectively serve as the positive and negative electrodes of the battery cell unit 1, realizing the charge and discharge of the battery cell unit 1.

[0059] By arranging the terminal post 102 at the top of the battery cell unit 1 opposite to the explosion-proof valve 101, the influence of the high-temperature gas generated by the explosion-proof valve 101 on the terminal post 102 is further reduced, which is beneficial to avoiding the phenomenon of heat accumulation and temperature rise of the terminal post 102 due to the exhaust of the explosion-proof valve 101 and improving the electrical safety of the battery cell unit 1.

[0060] Referring to Figure 2 and Figure 3 , for the purpose of improving the heat dissipation effect and structural stability of the battery cell unit 1, in this embodiment, a limiting groove 103 is opened on the side wall of the battery cell unit 1. The shape of the limiting groove 103 is an oval shallow groove. A glue-blocking foam 104 is installed in the limiting groove 103. The glue-blocking foam 104 is set as a ring shape consistent with the shape of the limiting groove 103. A gap of 5 mm to 10 mm is reserved between the edge of the limiting groove 103 and the periphery of the battery cell unit 1.

[0061] By providing a limiting groove 103 on the side wall of the battery cell unit 1, it is possible to provide a limit for the installation of the glue-blocking foam 104. By setting the shapes of the limiting groove 103 and the glue-blocking foam 104 to be oval, and further setting a gap of 5 mm to 10 mm between the limiting groove 103 and the periphery of the battery cell unit 1, compared with the rectangular glue-blocking foam 104 in the prior art, the phenomenon of glue opening at the four corners of the glue-blocking foam 104 in the prior art is not likely to occur, and it has better bonding strength. By setting the glue-blocking foam 104 in a ring shape, it is possible to limit the heat-conducting structural adhesive between the battery cell unit 1 and the cold plate 2, which is beneficial to avoiding the problem of the decrease in the number of charge and discharge cycles of the battery cell caused by the excessive overflow area of the heat-conducting structural adhesive. By adopting the window bonding method between the battery cell unit 1 and the cold plate 2, the mode of the battery pack is improved, and structures such as steel tie straps used for placing the battery cell in the box in the prior art are eliminated. While ensuring the structural strength and position stability, the utilization rate of the internal space of the battery pack is improved.

[0062] Referring to Figure 1 and Figure 4 , in order to keep the temperature of the battery cell unit 1 within a suitable range, in this embodiment, the cold plate 2 includes a flow channel plate 201 and a diversion pipe 202. Among them, the flow channel plate 201 is arranged vertically between two adjacent battery cell units 1. The plane where the flow channel plate 201 is located is perpendicular to the horizontal plane. The two side surfaces of the flow channel plate 201 are attached to the battery cell units 1 on both sides. The flow channel plate 201 is a hollow rectangular metal plate with a cavity formed inside. The material of the flow channel plate 201 can be a material with good thermal conductivity such as copper alloy or aluminum alloy. The diversion pipes 202 are arranged on both sides of the flow channel plate 201. The diversion pipes 202 are communicated with the cavity inside the flow channel plate 201.

[0063] By providing a flow channel plate 201 between two adjacent battery cell units 1, it is possible to transfer the heat generated by the battery cell unit 1 to the outside through heat exchange during the process of the cooling medium flowing along the flow channel plate 201. By providing diversion pipes 202 at both ends of the flow channel plate 201, it is possible to conveniently form a connection structure between the flow channel plate 201 and the cooling medium circulation system, which is convenient for installation and maintenance.

[0064] Referring to Figure 1 and Figure 4 , for the purpose of further improving the heat dissipation efficiency, in this embodiment, the diversion pipes 202 on the same side of the flow channel plate 201 are configured as a plurality of pipes uniformly arranged along the height direction. In this embodiment, three diversion pipes 202 are provided on the same side. The plurality of diversion pipes 202 are arranged parallel to each other and are all communicated with the cavity inside the flow channel plate 201.

[0065] By arranging a plurality of mutually parallel diversion tubes 202 on the same side of the flow channel plate 201, the flow velocity of the heat-conducting medium in the flow channel plate 201 can be increased, thereby improving the heat dissipation efficiency of the cold plate 2 and keeping the ambient temperature inside the battery pack within a suitable range.

[0066] Referring to Figure 1 and Figure 4 , in order to improve the structural stability between the cold plate 2 and the battery cell unit 1, in this embodiment, the cold plate 2 further includes a rib 203. The ribs 203 are symmetrically distributed on both sides under the upper cover of the flow channel plate 201 and are perpendicular to the plane where the flow channel plate 201 is located, forming a structure with a "work" - shaped cross - section.

[0067] By arranging flanging structures perpendicular to itself at the upper and lower ends of the flow channel plate 201, the supporting effect of the cold plate 2 on the battery cell unit 1 is improved, which is beneficial to avoiding the problem of decreased heat dissipation efficiency caused by misalignment between the battery cell unit 1 and the cold plate 2 during use.

[0068] Referring to Figure 1 and Figure 5 , for the purpose of discharging the high - temperature gas generated by the explosion - proof valve 101 to the outside of the battery pack, in this embodiment, the bottom case 3 includes a bottom plate 301 and side plates 302. Among them, the bottom plate 301 is a hollow plate made of copper alloy or aluminum alloy with relatively high heat conduction efficiency. A plurality of through - holes 303 are formed on the bottom plate 301. The positions where the through - holes 303 are distributed on the bottom plate 301 correspond one - to - one with the distribution positions of the explosion - proof valves 101 on the battery cell unit 1. The bottom plate 301 faces the explosion - proof valve 101 through the through - holes 303. The side plates 302 are vertically arranged at the edge positions of the upper surface of the bottom plate 301. The side plates 302 are hollow plates made of the same material as the bottom plate 301. The side plates 302 are connected to the bottom plate 301.

[0069] By setting the bottom case 3 into a structure of a hollow and mutually - connected bottom plate 301 and side plates 302, while realizing the basic function of the bottom case 3 to support and limit the battery cell unit 1 and the cold plate 2, through - holes 303 corresponding one - to - one with the explosion - proof valves 101 are formed on the bottom plate 301. When the battery cell unit 1 has a thermal runaway, the high - temperature gas discharged can directly enter the bottom plate 301 through the through - holes 303. The bottom plate 301 plays a role in cooling and guiding the high - temperature gas, and can be secondarily cooled through the side plates 302 and then discharged to the outside of the battery pack. Thereby, it is beneficial to avoid the influence of the exhaust of the explosion - proof valve 101 on the internal electrical connection structure and the battery pack management system, and achieves the invention purpose of thermoelectric separation and improving the electrical safety of the battery pack.

[0070] Referring to Figure 1 and Figure 5, for the convenience of connecting the cold plate 2 with an external cooling medium circulation system, in this embodiment, two side edges of the bottom plate 301 perpendicular to the length direction of the cold plate 2 extend towards both ends respectively to form extension parts 304.

[0071] By providing the extension parts 304 on the two side edges of the bottom plate 301 perpendicular to the length direction of the cold plate 2, space can be reserved for the connection structure between the cold plate 2 and the external cooling medium circulation system, simplifying the connection steps of the cold plate 2 and making the installation process easy to operate.

[0072] Refer to Figure 1 , for the purpose of resisting the expansion force of the battery cells and increasing the service life of the battery pack, in this embodiment, a buffer member 305 is provided on the inner wall of the side plate 302 by means of bonding with a thermally conductive structural adhesive. The buffer member 305 can be an epoxy board bonded with compressed foam, and the epoxy board plays a supporting role for the setting of the compressed foam. The buffer member 305 enters the box together with the large module composed of the battery cell unit 1 and the cold plate 2.

[0073] By providing the buffer member 305 on the inner wall of the side plate 302, a compression gap can be provided for the process of installing the large module composed of the battery cell unit 1 and the cold plate 2 into the box, and during subsequent use, a certain margin can be left for the expansion and deformation of the battery cell unit 1, thereby reducing the influence of the battery cell expansion force on the service life of the battery cell unit 1 and increasing the number of charge and discharge cycles. In addition, the setting of the buffer member 305 can improve the overall structural strength of the battery pack.

[0074] Embodiment Two

[0075] This embodiment relates to an energy storage device, including the battery pack structure described in Embodiment One.

[0076] In this embodiment, by providing the battery pack structure described in Embodiment One in the energy storage device, the high-temperature gas generated by the explosion-proof valve 101 of the battery cell unit 1 can be discharged to the outside of the battery pack after secondary cooling through the bottom case 3, thereby achieving the invention purpose of improving the electrical safety of the battery pack. In addition, the battery pack has high structural strength, high space utilization rate inside the battery pack, and large energy density.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A battery pack structure, characterized in that: It includes a battery cell unit, which is constructed as a plurality of densely arranged in a matrix; A cold plate is arranged between two adjacent battery cell units and is adhesively bonded to the battery cell unit; A bottom case is arranged to fit the bottoms of the battery cell unit and the cold plate; An explosion-proof valve is provided at the bottom of the battery cell unit, and a weak part or an exhaust port / channel of the bottom case is arranged opposite to the explosion-proof valve, and can guide the gas discharged by the explosion-proof valve to the outside; An end plate is connected to the cold plate and forms a module with the battery cell unit.

2. The battery pack structure according to claim 1, characterized in that: A pole is provided at the top of the battery cell unit.

3. The battery pack structure according to claim 1, characterized in that: A limiting groove is formed in the side wall of the battery cell unit, the limiting groove is oval, and a glue-blocking foam is arranged in the limiting groove.

4. The battery pack structure according to claim 1, characterized in that: The cold plate includes a flow channel plate, which is arranged between two adjacent battery cell units in the vertical direction and is in contact with the battery cell unit; Flow guide pipes are arranged at both ends of the flow channel plate and are internally communicated with the flow channel plate.

5. The battery pack structure according to claim 4, characterized in that: The flow guide pipes located on the same side of the flow channel plate are constructed as a plurality of uniformly arranged along the height direction, and all the flow guide pipes are internally communicated with the flow channel plate, and / or, The cold plate further includes a retaining edge, which is symmetrically distributed on the upper and lower sides of the flow channel plate and is perpendicular to the plane where the flow channel plate is located.

6. The battery pack structure according to claim 3, characterized in that: A gap of 5 mm to 10 mm is reserved between the edge of the limiting groove and the periphery of the battery cell unit.

7. The battery pack structure according to claim 1, characterized in that: The bottom case includes a bottom plate, which is arranged to fit the bottoms of the battery cell unit and the cold plate; Side plates are vertically arranged at the edge of the upper surface of the bottom plate and are communicated with the bottom plate; Through holes are formed in the bottom plate, and the through holes are constructed as a plurality of corresponding to the explosion-proof valves one by one.

8. The battery pack structure according to claim 7, characterized in that: The two side edges of the bottom plate perpendicular to the length direction of the cold plate extend outward to form extension parts.

9. The battery pack structure according to claim 7, characterized in that: A buffer member is adhesively arranged on the inner wall of the side plate.

10. An energy storage device, characterized in that: It includes the battery pack structure according to any one of claims 1 to 9.

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